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TLS: restore TLS protocol version to default Received: header
[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 #if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
12 # error TLS is required for DANE
13 #endif
14
15
16 /* Options specific to the smtp transport. This transport also supports LMTP
17 over TCP/IP. The options must be in alphabetic order (note that "_" comes
18 before the lower case letters). Some live in the transport_instance block so as
19 to be publicly visible; these are flagged with opt_public. */
20
21 optionlist smtp_transport_options[] = {
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 #ifdef EXPERIMENTAL_ARC
32 { "arc_sign", opt_stringptr,
33 (void *)offsetof(smtp_transport_options_block, arc_sign) },
34 #endif
35 { "authenticated_sender", opt_stringptr,
36 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
37 { "authenticated_sender_force", opt_bool,
38 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
39 { "command_timeout", opt_time,
40 (void *)offsetof(smtp_transport_options_block, command_timeout) },
41 { "connect_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
43 { "connection_max_messages", opt_int | opt_public,
44 (void *)offsetof(transport_instance, connection_max_messages) },
45 # ifdef SUPPORT_DANE
46 { "dane_require_tls_ciphers", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dane_require_tls_ciphers) },
48 # endif
49 { "data_timeout", opt_time,
50 (void *)offsetof(smtp_transport_options_block, data_timeout) },
51 { "delay_after_cutoff", opt_bool,
52 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
53 #ifndef DISABLE_DKIM
54 { "dkim_canon", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
56 { "dkim_domain", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
58 { "dkim_hash", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
60 { "dkim_identity", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
62 { "dkim_private_key", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
64 { "dkim_selector", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
66 { "dkim_sign_headers", opt_stringptr,
67 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
68 { "dkim_strict", opt_stringptr,
69 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
70 { "dkim_timestamps", opt_stringptr,
71 (void *)offsetof(smtp_transport_options_block, dkim.dkim_timestamps) },
72 #endif
73 { "dns_qualify_single", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
75 { "dns_search_parents", opt_bool,
76 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
77 { "dnssec_request_domains", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
79 { "dnssec_require_domains", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
81 { "dscp", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, dscp) },
83 { "fallback_hosts", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
85 { "final_timeout", opt_time,
86 (void *)offsetof(smtp_transport_options_block, final_timeout) },
87 { "gethostbyname", opt_bool,
88 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
89 { "helo_data", opt_stringptr,
90 (void *)offsetof(smtp_transport_options_block, helo_data) },
91 { "hosts", opt_stringptr,
92 (void *)offsetof(smtp_transport_options_block, hosts) },
93 { "hosts_avoid_esmtp", opt_stringptr,
94 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
95 { "hosts_avoid_pipelining", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
97 #ifndef DISABLE_TLS
98 { "hosts_avoid_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
100 #endif
101 { "hosts_max_try", opt_int,
102 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
103 { "hosts_max_try_hardlimit", opt_int,
104 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
105 #ifndef DISABLE_TLS
106 { "hosts_nopass_tls", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
108 { "hosts_noproxy_tls", opt_stringptr,
109 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
110 #endif
111 { "hosts_override", opt_bool,
112 (void *)offsetof(smtp_transport_options_block, hosts_override) },
113 #ifdef SUPPORT_PIPE_CONNECT
114 { "hosts_pipe_connect", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_pipe_connect) },
116 #endif
117 { "hosts_randomize", opt_bool,
118 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
119 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
120 { "hosts_request_ocsp", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
122 #endif
123 { "hosts_require_auth", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
125 #ifndef DISABLE_TLS
126 # ifdef SUPPORT_DANE
127 { "hosts_require_dane", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
129 # endif
130 # ifndef DISABLE_OCSP
131 { "hosts_require_ocsp", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
133 # endif
134 { "hosts_require_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
136 #endif
137 { "hosts_try_auth", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
139 { "hosts_try_chunking", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
141 #ifdef SUPPORT_DANE
142 { "hosts_try_dane", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
144 #endif
145 { "hosts_try_fastopen", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
147 #ifndef DISABLE_PRDR
148 { "hosts_try_prdr", opt_stringptr,
149 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
150 #endif
151 #ifndef DISABLE_TLS
152 { "hosts_verify_avoid_tls", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
154 #endif
155 { "interface", opt_stringptr,
156 (void *)offsetof(smtp_transport_options_block, interface) },
157 { "keepalive", opt_bool,
158 (void *)offsetof(smtp_transport_options_block, keepalive) },
159 { "lmtp_ignore_quota", opt_bool,
160 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
161 { "max_rcpt", opt_int | opt_public,
162 (void *)offsetof(transport_instance, max_addresses) },
163 { "multi_domain", opt_expand_bool | opt_public,
164 (void *)offsetof(transport_instance, multi_domain) },
165 { "port", opt_stringptr,
166 (void *)offsetof(smtp_transport_options_block, port) },
167 { "protocol", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, protocol) },
169 { "retry_include_ip_address", opt_expand_bool,
170 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
171 { "serialize_hosts", opt_stringptr,
172 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
173 { "size_addition", opt_int,
174 (void *)offsetof(smtp_transport_options_block, size_addition) },
175 #ifdef SUPPORT_SOCKS
176 { "socks_proxy", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, socks_proxy) },
178 #endif
179 #ifndef DISABLE_TLS
180 { "tls_certificate", opt_stringptr,
181 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
182 { "tls_crl", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_crl) },
184 { "tls_dh_min_bits", opt_int,
185 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
186 { "tls_privatekey", opt_stringptr,
187 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
188 { "tls_require_ciphers", opt_stringptr,
189 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
190 # ifdef EXPERIMENTAL_TLS_RESUME
191 { "tls_resumption_hosts", opt_stringptr,
192 (void *)offsetof(smtp_transport_options_block, tls_resumption_hosts) },
193 # endif
194 { "tls_sni", opt_stringptr,
195 (void *)offsetof(smtp_transport_options_block, tls_sni) },
196 { "tls_tempfail_tryclear", opt_bool,
197 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
198 { "tls_try_verify_hosts", opt_stringptr,
199 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
200 { "tls_verify_cert_hostnames", opt_stringptr,
201 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
202 { "tls_verify_certificates", opt_stringptr,
203 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
204 { "tls_verify_hosts", opt_stringptr,
205 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) },
206 #endif
207 #ifdef SUPPORT_I18N
208 { "utf8_downconvert", opt_stringptr,
209 (void *)offsetof(smtp_transport_options_block, utf8_downconvert) },
210 #endif
211 };
212
213 /* Size of the options list. An extern variable has to be used so that its
214 address can appear in the tables drtables.c. */
215
216 int smtp_transport_options_count = nelem(smtp_transport_options);
217
218
219 #ifdef MACRO_PREDEF
220
221 /* Dummy values */
222 smtp_transport_options_block smtp_transport_option_defaults = {0};
223 void smtp_transport_init(transport_instance *tblock) {}
224 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
225 void smtp_transport_closedown(transport_instance *tblock) {}
226
227 #else /*!MACRO_PREDEF*/
228
229
230 /* Default private options block for the smtp transport. */
231
232 smtp_transport_options_block smtp_transport_option_defaults = {
233 .hosts = NULL,
234 .fallback_hosts = NULL,
235 .hostlist = NULL,
236 .fallback_hostlist = NULL,
237 .helo_data = US"$primary_hostname",
238 .interface = NULL,
239 .port = NULL,
240 .protocol = US"smtp",
241 .dscp = NULL,
242 .serialize_hosts = NULL,
243 .hosts_try_auth = NULL,
244 .hosts_require_auth = NULL,
245 .hosts_try_chunking = US"*",
246 #ifdef SUPPORT_DANE
247 .hosts_try_dane = US"*",
248 .hosts_require_dane = NULL,
249 .dane_require_tls_ciphers = NULL,
250 #endif
251 .hosts_try_fastopen = US"*",
252 #ifndef DISABLE_PRDR
253 .hosts_try_prdr = US"*",
254 #endif
255 #ifndef DISABLE_OCSP
256 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
257 .hosts_require_ocsp = NULL,
258 #endif
259 .hosts_require_tls = NULL,
260 .hosts_avoid_tls = NULL,
261 .hosts_verify_avoid_tls = NULL,
262 .hosts_avoid_pipelining = NULL,
263 #ifdef SUPPORT_PIPE_CONNECT
264 .hosts_pipe_connect = NULL,
265 #endif
266 .hosts_avoid_esmtp = NULL,
267 #ifndef DISABLE_TLS
268 .hosts_nopass_tls = NULL,
269 .hosts_noproxy_tls = NULL,
270 #endif
271 .command_timeout = 5*60,
272 .connect_timeout = 5*60,
273 .data_timeout = 5*60,
274 .final_timeout = 10*60,
275 .size_addition = 1024,
276 .hosts_max_try = 5,
277 .hosts_max_try_hardlimit = 50,
278 .address_retry_include_sender = TRUE,
279 .allow_localhost = FALSE,
280 .authenticated_sender_force = FALSE,
281 .gethostbyname = FALSE,
282 .dns_qualify_single = TRUE,
283 .dns_search_parents = FALSE,
284 .dnssec = { .request= US"*", .require=NULL },
285 .delay_after_cutoff = TRUE,
286 .hosts_override = FALSE,
287 .hosts_randomize = FALSE,
288 .keepalive = TRUE,
289 .lmtp_ignore_quota = FALSE,
290 .expand_retry_include_ip_address = NULL,
291 .retry_include_ip_address = TRUE,
292 #ifdef SUPPORT_SOCKS
293 .socks_proxy = NULL,
294 #endif
295 #ifndef DISABLE_TLS
296 .tls_certificate = NULL,
297 .tls_crl = NULL,
298 .tls_privatekey = NULL,
299 .tls_require_ciphers = NULL,
300 .tls_sni = NULL,
301 .tls_verify_certificates = US"system",
302 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
303 .tls_tempfail_tryclear = TRUE,
304 # ifdef EXPERIMENTAL_TLS_RESUME
305 .tls_resumption_hosts = NULL,
306 # endif
307 .tls_verify_hosts = NULL,
308 .tls_try_verify_hosts = US"*",
309 .tls_verify_cert_hostnames = US"*",
310 #endif
311 #ifdef SUPPORT_I18N
312 .utf8_downconvert = NULL,
313 #endif
314 #ifndef DISABLE_DKIM
315 .dkim =
316 {.dkim_domain = NULL,
317 .dkim_identity = NULL,
318 .dkim_private_key = NULL,
319 .dkim_selector = NULL,
320 .dkim_canon = NULL,
321 .dkim_sign_headers = NULL,
322 .dkim_strict = NULL,
323 .dkim_hash = US"sha256",
324 .dkim_timestamps = NULL,
325 .dot_stuffed = FALSE,
326 .force_bodyhash = FALSE,
327 # ifdef EXPERIMENTAL_ARC
328 .arc_signspec = NULL,
329 # endif
330 },
331 # ifdef EXPERIMENTAL_ARC
332 .arc_sign = NULL,
333 # endif
334 #endif
335 };
336
337 /* some DSN flags for use later */
338
339 static int rf_list[] = {rf_notify_never, rf_notify_success,
340 rf_notify_failure, rf_notify_delay };
341
342 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
343
344
345
346 /* Local statics */
347
348 static uschar *smtp_command; /* Points to last cmd for error messages */
349 static uschar *mail_command; /* Points to MAIL cmd for error messages */
350 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
351 static BOOL update_waiting; /* TRUE to update the "wait" database */
352
353 /*XXX move to smtp_context */
354 static BOOL pipelining_active; /* current transaction is in pipe mode */
355
356
357 static unsigned ehlo_response(uschar * buf, unsigned checks);
358
359
360 /*************************************************
361 * Setup entry point *
362 *************************************************/
363
364 /* This function is called when the transport is about to be used,
365 but before running it in a sub-process. It is used for two things:
366
367 (1) To set the fallback host list in addresses, when delivering.
368 (2) To pass back the interface, port, protocol, and other options, for use
369 during callout verification.
370
371 Arguments:
372 tblock pointer to the transport instance block
373 addrlist list of addresses about to be transported
374 tf if not NULL, pointer to block in which to return options
375 uid the uid that will be set (not used)
376 gid the gid that will be set (not used)
377 errmsg place for error message (not used)
378
379 Returns: OK always (FAIL, DEFER not used)
380 */
381
382 static int
383 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
384 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
385 {
386 smtp_transport_options_block *ob = SOB tblock->options_block;
387
388 errmsg = errmsg; /* Keep picky compilers happy */
389 uid = uid;
390 gid = gid;
391
392 /* Pass back options if required. This interface is getting very messy. */
393
394 if (tf)
395 {
396 tf->interface = ob->interface;
397 tf->port = ob->port;
398 tf->protocol = ob->protocol;
399 tf->hosts = ob->hosts;
400 tf->hosts_override = ob->hosts_override;
401 tf->hosts_randomize = ob->hosts_randomize;
402 tf->gethostbyname = ob->gethostbyname;
403 tf->qualify_single = ob->dns_qualify_single;
404 tf->search_parents = ob->dns_search_parents;
405 tf->helo_data = ob->helo_data;
406 }
407
408 /* Set the fallback host list for all the addresses that don't have fallback
409 host lists, provided that the local host wasn't present in the original host
410 list. */
411
412 if (!testflag(addrlist, af_local_host_removed))
413 for (; addrlist; addrlist = addrlist->next)
414 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
415
416 return OK;
417 }
418
419
420
421 /*************************************************
422 * Initialization entry point *
423 *************************************************/
424
425 /* Called for each instance, after its options have been read, to
426 enable consistency checks to be done, or anything else that needs
427 to be set up.
428
429 Argument: pointer to the transport instance block
430 Returns: nothing
431 */
432
433 void
434 smtp_transport_init(transport_instance *tblock)
435 {
436 smtp_transport_options_block *ob = SOB tblock->options_block;
437
438 /* Retry_use_local_part defaults FALSE if unset */
439
440 if (tblock->retry_use_local_part == TRUE_UNSET)
441 tblock->retry_use_local_part = FALSE;
442
443 /* Set the default port according to the protocol */
444
445 if (!ob->port)
446 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
447 ? US"lmtp"
448 : strcmpic(ob->protocol, US"smtps") == 0
449 ? US"smtps" : US"smtp";
450
451 /* Set up the setup entry point, to be called before subprocesses for this
452 transport. */
453
454 tblock->setup = smtp_transport_setup;
455
456 /* Complain if any of the timeouts are zero. */
457
458 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
459 ob->final_timeout <= 0)
460 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
461 "command, data, or final timeout value is zero for %s transport",
462 tblock->name);
463
464 /* If hosts_override is set and there are local hosts, set the global
465 flag that stops verify from showing router hosts. */
466
467 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
468
469 /* If there are any fallback hosts listed, build a chain of host items
470 for them, but do not do any lookups at this time. */
471
472 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
473 }
474
475
476
477
478
479 /*************************************************
480 * Set delivery info into all active addresses *
481 *************************************************/
482
483 /* Only addresses whose status is >= PENDING are relevant. A lesser
484 status means that an address is not currently being processed.
485
486 Arguments:
487 addrlist points to a chain of addresses
488 errno_value to put in each address's errno field
489 msg to put in each address's message field
490 rc to put in each address's transport_return field
491 pass_message if TRUE, set the "pass message" flag in the address
492 host if set, mark addrs as having used this host
493 smtp_greeting from peer
494 helo_response from peer
495
496 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
497 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
498 this particular type of timeout.
499
500 Returns: nothing
501 */
502
503 static void
504 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
505 BOOL pass_message, host_item * host
506 #ifdef EXPERIMENTAL_DSN_INFO
507 , const uschar * smtp_greeting, const uschar * helo_response
508 #endif
509 )
510 {
511 int orvalue = 0;
512 if (errno_value == ERRNO_CONNECTTIMEOUT)
513 {
514 errno_value = ETIMEDOUT;
515 orvalue = RTEF_CTOUT;
516 }
517 for (address_item * addr = addrlist; addr; addr = addr->next)
518 if (addr->transport_return >= PENDING)
519 {
520 addr->basic_errno = errno_value;
521 addr->more_errno |= orvalue;
522 if (msg)
523 {
524 addr->message = msg;
525 if (pass_message) setflag(addr, af_pass_message);
526 }
527 addr->transport_return = rc;
528 if (host)
529 {
530 addr->host_used = host;
531 #ifdef EXPERIMENTAL_DSN_INFO
532 if (smtp_greeting)
533 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
534 addr->smtp_greeting = smtp_greeting;
535
536 if (helo_response)
537 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
538 addr->helo_response = helo_response;
539 #endif
540 }
541 }
542 }
543
544 static void
545 set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
546 BOOL pass_message)
547 {
548 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
549 #ifdef EXPERIMENTAL_DSN_INFO
550 , NULL, NULL
551 #endif
552 );
553 }
554
555
556 /*************************************************
557 * Check an SMTP response *
558 *************************************************/
559
560 /* This function is given an errno code and the SMTP response buffer
561 to analyse, together with the host identification for generating messages. It
562 sets an appropriate message and puts the first digit of the response code into
563 the yield variable. If no response was actually read, a suitable digit is
564 chosen.
565
566 Arguments:
567 host the current host, to get its name for messages
568 errno_value pointer to the errno value
569 more_errno from the top address for use with ERRNO_FILTER_FAIL
570 buffer the SMTP response buffer
571 yield where to put a one-digit SMTP response code
572 message where to put an error message
573 pass_message set TRUE if message is an SMTP response
574
575 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
576 */
577
578 static BOOL
579 check_response(host_item *host, int *errno_value, int more_errno,
580 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
581 {
582 uschar * pl = pipelining_active ? US"pipelined " : US"";
583 const uschar * s;
584
585 *yield = '4'; /* Default setting is to give a temporary error */
586
587 switch(*errno_value)
588 {
589 case ETIMEDOUT: /* Handle response timeout */
590 *message = US string_sprintf("SMTP timeout after %s%s",
591 pl, smtp_command);
592 if (transport_count > 0)
593 *message = US string_sprintf("%s (%d bytes written)", *message,
594 transport_count);
595 return FALSE;
596
597 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
598 s = string_printing(buffer);
599 while (isspace(*s)) s++;
600 *message = *s == 0
601 ? string_sprintf("Malformed SMTP reply (an empty line) "
602 "in response to %s%s", pl, smtp_command)
603 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
604 pl, smtp_command, s);
605 return FALSE;
606
607 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
608 GnuTLS and TLS1.3 */
609 *message = US"bad first read from TLS conn";
610 return TRUE;
611
612 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
613 can't send QUIT as we mustn't end the DATA. */
614 *message = string_sprintf("transport filter process failed (%d)%s",
615 more_errno,
616 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
617 return FALSE;
618
619 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
620 can't send QUIT as we mustn't end the DATA. */
621 *message =
622 string_sprintf("failed to expand headers_add or headers_remove: %s",
623 expand_string_message);
624 return FALSE;
625
626 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
627 *message = US"failed to write a data block";
628 return FALSE;
629
630 #ifdef SUPPORT_I18N
631 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
632 *message = US"utf8 support required but not offered for forwarding";
633 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
634 return TRUE;
635 #endif
636 }
637
638 /* Handle error responses from the remote mailer. */
639
640 if (buffer[0] != 0)
641 {
642 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
643 "%s", pl, smtp_command, s = string_printing(buffer));
644 *pass_message = TRUE;
645 *yield = buffer[0];
646 return TRUE;
647 }
648
649 /* No data was read. If there is no errno, this must be the EOF (i.e.
650 connection closed) case, which causes deferral. An explicit connection reset
651 error has the same effect. Otherwise, put the host's identity in the message,
652 leaving the errno value to be interpreted as well. In all cases, we have to
653 assume the connection is now dead. */
654
655 if (*errno_value == 0 || *errno_value == ECONNRESET)
656 {
657 *errno_value = ERRNO_SMTPCLOSED;
658 *message = US string_sprintf("Remote host closed connection "
659 "in response to %s%s", pl, smtp_command);
660 }
661 else
662 *message = US string_sprintf("%s [%s]", host->name, host->address);
663
664 return FALSE;
665 }
666
667
668
669 /*************************************************
670 * Write error message to logs *
671 *************************************************/
672
673 /* This writes to the main log and to the message log.
674
675 Arguments:
676 host the current host
677 detail the current message (addr_item->message)
678 basic_errno the errno (addr_item->basic_errno)
679
680 Returns: nothing
681 */
682
683 static void
684 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
685 {
686 gstring * message = LOGGING(outgoing_port)
687 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
688 host->port == PORT_NONE ? 25 : host->port)
689 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
690
691 if (suffix)
692 {
693 message = string_fmt_append(message, ": %s", suffix);
694 if (basic_errno > 0)
695 message = string_fmt_append(message, ": %s", strerror(basic_errno));
696 }
697 else
698 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
699
700 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
701 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
702 }
703
704 static void
705 msglog_line(host_item * host, uschar * message)
706 {
707 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
708 host->name, host->address, message);
709 }
710
711
712
713 #ifndef DISABLE_EVENT
714 /*************************************************
715 * Post-defer action *
716 *************************************************/
717
718 /* This expands an arbitrary per-transport string.
719 It might, for example, be used to write to the database log.
720
721 Arguments:
722 addr the address item containing error information
723 host the current host
724
725 Returns: nothing
726 */
727
728 static void
729 deferred_event_raise(address_item *addr, host_item *host)
730 {
731 uschar * action = addr->transport->event_action;
732 const uschar * save_domain;
733 uschar * save_local;
734
735 if (!action)
736 return;
737
738 save_domain = deliver_domain;
739 save_local = deliver_localpart;
740
741 /*XXX would ip & port already be set up? */
742 deliver_host_address = string_copy(host->address);
743 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
744 event_defer_errno = addr->basic_errno;
745
746 router_name = addr->router->name;
747 transport_name = addr->transport->name;
748 deliver_domain = addr->domain;
749 deliver_localpart = addr->local_part;
750
751 (void) event_raise(action, US"msg:host:defer",
752 addr->message
753 ? addr->basic_errno > 0
754 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
755 : string_copy(addr->message)
756 : addr->basic_errno > 0
757 ? string_copy(US strerror(addr->basic_errno))
758 : NULL);
759
760 deliver_localpart = save_local;
761 deliver_domain = save_domain;
762 router_name = transport_name = NULL;
763 }
764 #endif
765
766 /*************************************************
767 * Reap SMTP specific responses *
768 *************************************************/
769 static int
770 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
771 int count)
772 {
773 uschar flushbuffer[4096];
774
775 while (count-- > 0)
776 {
777 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
778 '2', ob->command_timeout)
779 && (errno != 0 || flushbuffer[0] == 0))
780 break;
781 }
782 return count;
783 }
784
785
786 /* Return boolean success */
787
788 static BOOL
789 smtp_reap_banner(smtp_context * sx)
790 {
791 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
792 '2', (SOB sx->conn_args.ob)->command_timeout);
793 #ifdef EXPERIMENTAL_DSN_INFO
794 sx->smtp_greeting = string_copy(sx->buffer);
795 #endif
796 return good_response;
797 }
798
799 static BOOL
800 smtp_reap_ehlo(smtp_context * sx)
801 {
802 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
803 (SOB sx->conn_args.ob)->command_timeout))
804 {
805 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
806 {
807 #ifdef EXPERIMENTAL_DSN_INFO
808 sx->helo_response = string_copy(sx->buffer);
809 #endif
810 return FALSE;
811 }
812 sx->esmtp = FALSE;
813 }
814 #ifdef EXPERIMENTAL_DSN_INFO
815 sx->helo_response = string_copy(sx->buffer);
816 #endif
817 #ifndef DISABLE_EVENT
818 (void) event_raise(sx->conn_args.tblock->event_action,
819 US"smtp:ehlo", sx->buffer);
820 #endif
821 return TRUE;
822 }
823
824
825
826 #ifdef SUPPORT_PIPE_CONNECT
827 static uschar *
828 ehlo_cache_key(const smtp_context * sx)
829 {
830 host_item * host = sx->conn_args.host;
831 return Ustrchr(host->address, ':')
832 ? string_sprintf("[%s]:%d.EHLO", host->address,
833 host->port == PORT_NONE ? sx->port : host->port)
834 : string_sprintf("%s:%d.EHLO", host->address,
835 host->port == PORT_NONE ? sx->port : host->port);
836 }
837
838 static void
839 write_ehlo_cache_entry(const smtp_context * sx)
840 {
841 open_db dbblock, * dbm_file;
842
843 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
844 {
845 uschar * ehlo_resp_key = ehlo_cache_key(sx);
846 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
847
848 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
849 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
850 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
851
852 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
853 dbfn_close(dbm_file);
854 }
855 }
856
857 static void
858 invalidate_ehlo_cache_entry(smtp_context * sx)
859 {
860 open_db dbblock, * dbm_file;
861
862 if ( sx->early_pipe_active
863 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
864 {
865 uschar * ehlo_resp_key = ehlo_cache_key(sx);
866 dbfn_delete(dbm_file, ehlo_resp_key);
867 dbfn_close(dbm_file);
868 }
869 }
870
871 static BOOL
872 read_ehlo_cache_entry(smtp_context * sx)
873 {
874 open_db dbblock;
875 open_db * dbm_file;
876
877 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
878 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
879 else
880 {
881 uschar * ehlo_resp_key = ehlo_cache_key(sx);
882 dbdata_ehlo_resp * er;
883
884 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
885 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
886 else if (time(NULL) - er->time_stamp > retry_data_expire)
887 {
888 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
889 dbfn_close(dbm_file);
890 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
891 dbfn_delete(dbm_file, ehlo_resp_key);
892 }
893 else
894 {
895 sx->ehlo_resp = er->data;
896 dbfn_close(dbm_file);
897 DEBUG(D_transport) debug_printf(
898 "EHLO response bits from cache: cleartext 0x%04x crypted 0x%04x\n",
899 er->data.cleartext_features, er->data.crypted_features);
900 return TRUE;
901 }
902 dbfn_close(dbm_file);
903 }
904 return FALSE;
905 }
906
907
908
909 /* Return an auths bitmap for the set of AUTH methods offered by the server
910 which match our authenticators. */
911
912 static unsigned short
913 study_ehlo_auths(smtp_context * sx)
914 {
915 uschar * names;
916 auth_instance * au;
917 uschar authnum;
918 unsigned short authbits = 0;
919
920 if (!sx->esmtp) return 0;
921 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
922 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
923 expand_nmax = -1; /* reset */
924 names = string_copyn(expand_nstring[1], expand_nlength[1]);
925
926 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
927 {
928 const uschar * list = names;
929 int sep = ' ';
930 uschar name[32];
931
932 while (string_nextinlist(&list, &sep, name, sizeof(name)))
933 if (strcmpic(au->public_name, name) == 0)
934 { authbits |= BIT(authnum); break; }
935 }
936
937 DEBUG(D_transport)
938 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
939 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
940
941 if (tls_out.active.sock >= 0)
942 sx->ehlo_resp.crypted_auths = authbits;
943 else
944 sx->ehlo_resp.cleartext_auths = authbits;
945 return authbits;
946 }
947
948
949
950
951 /* Wait for and check responses for early-pipelining.
952
953 Called from the lower-level smtp_read_response() function
954 used for general code that assume synchronisation, if context
955 flags indicate outstanding early-pipelining commands. Also
956 called fom sync_responses() which handles pipelined commands.
957
958 Arguments:
959 sx smtp connection context
960 countp number of outstanding responses, adjusted on return
961
962 Return:
963 OK all well
964 DEFER error on first read of TLS'd conn
965 FAIL SMTP error in response
966 */
967 int
968 smtp_reap_early_pipe(smtp_context * sx, int * countp)
969 {
970 BOOL pending_BANNER = sx->pending_BANNER;
971 BOOL pending_EHLO = sx->pending_EHLO;
972 int rc = FAIL;
973
974 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
975 sx->pending_EHLO = FALSE;
976
977 if (pending_BANNER)
978 {
979 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
980 (*countp)--;
981 if (!smtp_reap_banner(sx))
982 {
983 DEBUG(D_transport) debug_printf("bad banner\n");
984 if (tls_out.active.sock >= 0) rc = DEFER;
985 goto fail;
986 }
987 }
988
989 if (pending_EHLO)
990 {
991 unsigned peer_offered;
992 unsigned short authbits = 0, * ap;
993
994 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
995 (*countp)--;
996 if (!smtp_reap_ehlo(sx))
997 {
998 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
999 if (tls_out.active.sock >= 0) rc = DEFER;
1000 goto fail;
1001 }
1002
1003 /* Compare the actual EHLO response to the cached value we assumed;
1004 on difference, dump or rewrite the cache and arrange for a retry. */
1005
1006 ap = tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
1008
1009 peer_offered = ehlo_response(sx->buffer,
1010 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
1011 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
1012 | OPTION_UTF8 | OPTION_EARLY_PIPE
1013 );
1014 if ( peer_offered != sx->peer_offered
1015 || (authbits = study_ehlo_auths(sx)) != *ap)
1016 {
1017 HDEBUG(D_transport)
1018 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1019 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1020 sx->peer_offered, *ap, peer_offered, authbits);
1021 *(tls_out.active.sock < 0
1022 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1023 *ap = authbits;
1024 if (peer_offered & OPTION_EARLY_PIPE)
1025 write_ehlo_cache_entry(sx);
1026 else
1027 invalidate_ehlo_cache_entry(sx);
1028
1029 return OK; /* just carry on */
1030 }
1031 }
1032 return OK;
1033
1034 fail:
1035 invalidate_ehlo_cache_entry(sx);
1036 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1037 return rc;
1038 }
1039 #endif
1040
1041
1042 /*************************************************
1043 * Synchronize SMTP responses *
1044 *************************************************/
1045
1046 /* This function is called from smtp_deliver() to receive SMTP responses from
1047 the server, and match them up with the commands to which they relate. When
1048 PIPELINING is not in use, this function is called after every command, and is
1049 therefore somewhat over-engineered, but it is simpler to use a single scheme
1050 that works both with and without PIPELINING instead of having two separate sets
1051 of code.
1052
1053 The set of commands that are buffered up with pipelining may start with MAIL
1054 and may end with DATA; in between are RCPT commands that correspond to the
1055 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1056 etc.) are never buffered.
1057
1058 Errors after MAIL or DATA abort the whole process leaving the response in the
1059 buffer. After MAIL, pending responses are flushed, and the original command is
1060 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1061 permitted to reject some recipient addresses while accepting others. However
1062 certain errors clearly abort the whole process. Set the value in
1063 transport_return to PENDING_OK if the address is accepted. If there is a
1064 subsequent general error, it will get reset accordingly. If not, it will get
1065 converted to OK at the end.
1066
1067 Arguments:
1068 sx smtp connection context
1069 count the number of responses to read
1070 pending_DATA 0 if last command sent was not DATA
1071 +1 if previously had a good recipient
1072 -1 if not previously had a good recipient
1073
1074 Returns: 3 if at least one address had 2xx and one had 5xx
1075 2 if at least one address had 5xx but none had 2xx
1076 1 if at least one host had a 2xx response, but none had 5xx
1077 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1078 -1 timeout while reading RCPT response
1079 -2 I/O or other non-response error for RCPT
1080 -3 DATA or MAIL failed - errno and buffer set
1081 -4 banner or EHLO failed (early-pipelining)
1082 -5 banner or EHLO failed (early-pipelining, TLS)
1083 */
1084
1085 static int
1086 sync_responses(smtp_context * sx, int count, int pending_DATA)
1087 {
1088 address_item * addr = sx->sync_addr;
1089 smtp_transport_options_block * ob = sx->conn_args.ob;
1090 int yield = 0;
1091
1092 #ifdef SUPPORT_PIPE_CONNECT
1093 int rc;
1094 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1095 return rc == FAIL ? -4 : -5;
1096 #endif
1097
1098 /* Handle the response for a MAIL command. On error, reinstate the original
1099 command in big_buffer for error message use, and flush any further pending
1100 responses before returning, except after I/O errors and timeouts. */
1101
1102 if (sx->pending_MAIL)
1103 {
1104 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1105 count--;
1106 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1107 '2', ob->command_timeout))
1108 {
1109 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1110 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1111 if (errno == ERRNO_TLSFAILURE)
1112 return -5;
1113 if (errno == 0 && sx->buffer[0] != 0)
1114 {
1115 int save_errno = 0;
1116 if (sx->buffer[0] == '4')
1117 {
1118 save_errno = ERRNO_MAIL4XX;
1119 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1120 }
1121 count = smtp_discard_responses(sx, ob, count);
1122 errno = save_errno;
1123 }
1124
1125 if (pending_DATA) count--; /* Number of RCPT responses to come */
1126 while (count-- > 0) /* Mark any pending addrs with the host used */
1127 {
1128 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1129 addr->host_used = sx->conn_args.host;
1130 addr = addr->next;
1131 }
1132 return -3;
1133 }
1134 }
1135
1136 if (pending_DATA) count--; /* Number of RCPT responses to come */
1137
1138 /* Read and handle the required number of RCPT responses, matching each one up
1139 with an address by scanning for the next address whose status is PENDING_DEFER.
1140 */
1141
1142 while (count-- > 0)
1143 {
1144 while (addr->transport_return != PENDING_DEFER)
1145 if (!(addr = addr->next))
1146 return -2;
1147
1148 /* The address was accepted */
1149 addr->host_used = sx->conn_args.host;
1150
1151 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1152 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1153 '2', ob->command_timeout))
1154 {
1155 yield |= 1;
1156 addr->transport_return = PENDING_OK;
1157
1158 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1159 ensure that any address-specific retry record is expunged. We do this both
1160 for the basic key and for the version that also includes the sender. */
1161
1162 if (testflag(addr, af_dr_retry_exists))
1163 {
1164 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1165 sender_address);
1166 retry_add_item(addr, altkey, rf_delete);
1167 retry_add_item(addr, addr->address_retry_key, rf_delete);
1168 }
1169 }
1170
1171 /* Error on first TLS read */
1172
1173 else if (errno == ERRNO_TLSFAILURE)
1174 return -5;
1175
1176 /* Timeout while reading the response */
1177
1178 else if (errno == ETIMEDOUT)
1179 {
1180 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1181 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1182 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
1183 retry_add_item(addr, addr->address_retry_key, 0);
1184 update_waiting = FALSE;
1185 return -1;
1186 }
1187
1188 /* Handle other errors in obtaining an SMTP response by returning -1. This
1189 will cause all the addresses to be deferred. Restore the SMTP command in
1190 big_buffer for which we are checking the response, so the error message
1191 makes sense. */
1192
1193 else if (errno != 0 || sx->buffer[0] == 0)
1194 {
1195 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1196
1197 /* Use taint-unchecked routines for writing into big_buffer, trusting
1198 that we'll never expand it. */
1199
1200 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1201 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1202 string_from_gstring(g);
1203 return -2;
1204 }
1205
1206 /* Handle SMTP permanent and temporary response codes. */
1207
1208 else
1209 {
1210 addr->message =
1211 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1212 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1213 string_printing(sx->buffer));
1214 setflag(addr, af_pass_message);
1215 if (!sx->verify)
1216 msglog_line(sx->conn_args.host, addr->message);
1217
1218 /* The response was 5xx */
1219
1220 if (sx->buffer[0] == '5')
1221 {
1222 addr->transport_return = FAIL;
1223 yield |= 2;
1224 }
1225
1226 /* The response was 4xx */
1227
1228 else
1229 {
1230 addr->transport_return = DEFER;
1231 addr->basic_errno = ERRNO_RCPT4XX;
1232 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1233
1234 if (!sx->verify)
1235 {
1236 #ifndef DISABLE_EVENT
1237 event_defer_errno = addr->more_errno;
1238 msg_event_raise(US"msg:rcpt:host:defer", addr);
1239 #endif
1240
1241 /* Log temporary errors if there are more hosts to be tried.
1242 If not, log this last one in the == line. */
1243
1244 if (sx->conn_args.host->next)
1245 if (LOGGING(outgoing_port))
1246 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1247 sx->conn_args.host->address,
1248 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1249 else
1250 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1251 sx->conn_args.host->address, addr->message);
1252
1253 #ifndef DISABLE_EVENT
1254 else
1255 msg_event_raise(US"msg:rcpt:defer", addr);
1256 #endif
1257
1258 /* Do not put this message on the list of those waiting for specific
1259 hosts, as otherwise it is likely to be tried too often. */
1260
1261 update_waiting = FALSE;
1262
1263 /* Add a retry item for the address so that it doesn't get tried again
1264 too soon. If address_retry_include_sender is true, add the sender address
1265 to the retry key. */
1266
1267 retry_add_item(addr,
1268 ob->address_retry_include_sender
1269 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1270 : addr->address_retry_key,
1271 0);
1272 }
1273 }
1274 }
1275 } /* Loop for next RCPT response */
1276
1277 /* Update where to start at for the next block of responses, unless we
1278 have already handled all the addresses. */
1279
1280 if (addr) sx->sync_addr = addr->next;
1281
1282 /* Handle a response to DATA. If we have not had any good recipients, either
1283 previously or in this block, the response is ignored. */
1284
1285 if (pending_DATA != 0)
1286 {
1287 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1288 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1289 '3', ob->command_timeout))
1290 {
1291 int code;
1292 uschar *msg;
1293 BOOL pass_message;
1294
1295 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1296 return -5;
1297
1298 if (pending_DATA > 0 || (yield & 1) != 0)
1299 {
1300 if (errno == 0 && sx->buffer[0] == '4')
1301 {
1302 errno = ERRNO_DATA4XX;
1303 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1304 }
1305 return -3;
1306 }
1307 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1308 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1309 "is in use and there were no good recipients\n", msg);
1310 }
1311 }
1312
1313 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1314 present) received 3xx. If any RCPTs were handled and yielded anything other
1315 than 4xx, yield will be set non-zero. */
1316
1317 return yield;
1318 }
1319
1320
1321
1322
1323
1324 /* Try an authenticator's client entry */
1325
1326 static int
1327 try_authenticator(smtp_context * sx, auth_instance * au)
1328 {
1329 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1330 host_item * host = sx->conn_args.host; /* host to deliver to */
1331 int rc;
1332
1333 sx->outblock.authenticating = TRUE;
1334 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1335 sx->buffer, sizeof(sx->buffer));
1336 sx->outblock.authenticating = FALSE;
1337 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1338
1339 /* A temporary authentication failure must hold up delivery to
1340 this host. After a permanent authentication failure, we carry on
1341 to try other authentication methods. If all fail hard, try to
1342 deliver the message unauthenticated unless require_auth was set. */
1343
1344 switch(rc)
1345 {
1346 case OK:
1347 f.smtp_authenticated = TRUE; /* stops the outer loop */
1348 client_authenticator = au->name;
1349 if (au->set_client_id)
1350 client_authenticated_id = expand_string(au->set_client_id);
1351 break;
1352
1353 /* Failure after writing a command */
1354
1355 case FAIL_SEND:
1356 return FAIL_SEND;
1357
1358 /* Failure after reading a response */
1359
1360 case FAIL:
1361 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1362 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1363 au->name, host->name, host->address, sx->buffer);
1364 break;
1365
1366 /* Failure by some other means. In effect, the authenticator
1367 decided it wasn't prepared to handle this case. Typically this
1368 is the result of "fail" in an expansion string. Do we need to
1369 log anything here? Feb 2006: a message is now put in the buffer
1370 if logging is required. */
1371
1372 case CANCELLED:
1373 if (*sx->buffer != 0)
1374 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1375 "authentication H=%s [%s] %s", au->name, host->name,
1376 host->address, sx->buffer);
1377 break;
1378
1379 /* Internal problem, message in buffer. */
1380
1381 case ERROR:
1382 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1383 DEFER, FALSE);
1384 return ERROR;
1385 }
1386 return OK;
1387 }
1388
1389
1390
1391
1392 /* Do the client side of smtp-level authentication.
1393
1394 Arguments:
1395 sx smtp connection context
1396
1397 sx->buffer should have the EHLO response from server (gets overwritten)
1398
1399 Returns:
1400 OK Success, or failed (but not required): global "smtp_authenticated" set
1401 DEFER Failed authentication (and was required)
1402 ERROR Internal problem
1403
1404 FAIL_SEND Failed communications - transmit
1405 FAIL - response
1406 */
1407
1408 static int
1409 smtp_auth(smtp_context * sx)
1410 {
1411 host_item * host = sx->conn_args.host; /* host to deliver to */
1412 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1413 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1414 #ifdef SUPPORT_PIPE_CONNECT
1415 unsigned short authbits = tls_out.active.sock >= 0
1416 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1417 #endif
1418 uschar * fail_reason = US"server did not advertise AUTH support";
1419
1420 f.smtp_authenticated = FALSE;
1421 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1422
1423 if (!regex_AUTH)
1424 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1425
1426 /* Is the server offering AUTH? */
1427
1428 if ( sx->esmtp
1429 &&
1430 #ifdef SUPPORT_PIPE_CONNECT
1431 sx->early_pipe_active ? authbits
1432 :
1433 #endif
1434 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1435 )
1436 {
1437 uschar * names = NULL;
1438 expand_nmax = -1; /* reset */
1439
1440 #ifdef SUPPORT_PIPE_CONNECT
1441 if (!sx->early_pipe_active)
1442 #endif
1443 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1444
1445 /* Must not do this check until after we have saved the result of the
1446 regex match above as the check could be another RE. */
1447
1448 if ( require_auth == OK
1449 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1450 {
1451 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1452 fail_reason = US"no common mechanisms were found";
1453
1454 #ifdef SUPPORT_PIPE_CONNECT
1455 if (sx->early_pipe_active)
1456 {
1457 /* Scan our authenticators (which support use by a client and were offered
1458 by the server (checked at cache-write time)), not suppressed by
1459 client_condition. If one is found, attempt to authenticate by calling its
1460 client function. We are limited to supporting up to 16 authenticator
1461 public-names by the number of bits in a short. */
1462
1463 auth_instance * au;
1464 uschar bitnum;
1465 int rc;
1466
1467 for (bitnum = 0, au = auths;
1468 !f.smtp_authenticated && au && bitnum < 16;
1469 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1470 {
1471 if ( au->client_condition
1472 && !expand_check_condition(au->client_condition, au->name,
1473 US"client authenticator"))
1474 {
1475 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1476 au->name, "client_condition is false");
1477 continue;
1478 }
1479
1480 /* Found data for a listed mechanism. Call its client entry. Set
1481 a flag in the outblock so that data is overwritten after sending so
1482 that reflections don't show it. */
1483
1484 fail_reason = US"authentication attempt(s) failed";
1485
1486 if ((rc = try_authenticator(sx, au)) != OK)
1487 return rc;
1488 }
1489 }
1490 else
1491 #endif
1492
1493 /* Scan the configured authenticators looking for one which is configured
1494 for use as a client, which is not suppressed by client_condition, and
1495 whose name matches an authentication mechanism supported by the server.
1496 If one is found, attempt to authenticate by calling its client function.
1497 */
1498
1499 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1500 {
1501 uschar *p = names;
1502
1503 if ( !au->client
1504 || ( au->client_condition
1505 && !expand_check_condition(au->client_condition, au->name,
1506 US"client authenticator")))
1507 {
1508 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1509 au->name,
1510 (au->client)? "client_condition is false" :
1511 "not configured as a client");
1512 continue;
1513 }
1514
1515 /* Loop to scan supported server mechanisms */
1516
1517 while (*p)
1518 {
1519 int len = Ustrlen(au->public_name);
1520 int rc;
1521
1522 while (isspace(*p)) p++;
1523
1524 if (strncmpic(au->public_name, p, len) != 0 ||
1525 (p[len] != 0 && !isspace(p[len])))
1526 {
1527 while (*p != 0 && !isspace(*p)) p++;
1528 continue;
1529 }
1530
1531 /* Found data for a listed mechanism. Call its client entry. Set
1532 a flag in the outblock so that data is overwritten after sending so
1533 that reflections don't show it. */
1534
1535 fail_reason = US"authentication attempt(s) failed";
1536
1537 if ((rc = try_authenticator(sx, au)) != OK)
1538 return rc;
1539
1540 break; /* If not authenticated, try next authenticator */
1541 } /* Loop for scanning supported server mechanisms */
1542 } /* Loop for further authenticators */
1543 }
1544 }
1545
1546 /* If we haven't authenticated, but are required to, give up. */
1547
1548 if (require_auth == OK && !f.smtp_authenticated)
1549 {
1550 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1551 string_sprintf("authentication required but %s", fail_reason), DEFER,
1552 FALSE);
1553 return DEFER;
1554 }
1555
1556 return OK;
1557 }
1558
1559
1560 /* Construct AUTH appendix string for MAIL TO */
1561 /*
1562 Arguments
1563 buffer to build string
1564 addrlist chain of potential addresses to deliver
1565 ob transport options
1566
1567 Globals f.smtp_authenticated
1568 client_authenticated_sender
1569 Return True on error, otherwise buffer has (possibly empty) terminated string
1570 */
1571
1572 static BOOL
1573 smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1574 smtp_transport_options_block *ob)
1575 {
1576 uschar * local_authenticated_sender = authenticated_sender;
1577
1578 #ifdef notdef
1579 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1580 #endif
1581
1582 if (ob->authenticated_sender)
1583 {
1584 uschar *new = expand_string(ob->authenticated_sender);
1585 if (!new)
1586 {
1587 if (!f.expand_string_forcedfail)
1588 {
1589 uschar *message = string_sprintf("failed to expand "
1590 "authenticated_sender: %s", expand_string_message);
1591 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1592 return TRUE;
1593 }
1594 }
1595 else if (*new) local_authenticated_sender = new;
1596 }
1597
1598 /* Add the authenticated sender address if present */
1599
1600 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1601 && local_authenticated_sender)
1602 {
1603 string_format_nt(buffer, bufsize, " AUTH=%s",
1604 auth_xtextencode(local_authenticated_sender,
1605 Ustrlen(local_authenticated_sender)));
1606 client_authenticated_sender = string_copy(local_authenticated_sender);
1607 }
1608 else
1609 *buffer= 0;
1610
1611 return FALSE;
1612 }
1613
1614
1615
1616 typedef struct smtp_compare_s
1617 {
1618 uschar *current_sender_address;
1619 struct transport_instance *tblock;
1620 } smtp_compare_t;
1621
1622
1623 /* Create a unique string that identifies this message, it is based on
1624 sender_address, helo_data and tls_certificate if enabled.
1625 */
1626
1627 static uschar *
1628 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1629 {
1630 address_item * addr1;
1631 uschar * if1 = US"";
1632 uschar * helo1 = US"";
1633 #ifndef DISABLE_TLS
1634 uschar * tlsc1 = US"";
1635 #endif
1636 uschar * save_sender_address = sender_address;
1637 uschar * local_identity = NULL;
1638 smtp_transport_options_block * ob = SOB tblock->options_block;
1639
1640 sender_address = sender;
1641
1642 addr1 = deliver_make_addr (sender, TRUE);
1643 deliver_set_expansions(addr1);
1644
1645 if (ob->interface)
1646 if1 = expand_string(ob->interface);
1647
1648 if (ob->helo_data)
1649 helo1 = expand_string(ob->helo_data);
1650
1651 #ifndef DISABLE_TLS
1652 if (ob->tls_certificate)
1653 tlsc1 = expand_string(ob->tls_certificate);
1654 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1655 #else
1656 local_identity = string_sprintf ("%s^%s", if1, helo1);
1657 #endif
1658
1659 deliver_set_expansions(NULL);
1660 sender_address = save_sender_address;
1661
1662 return local_identity;
1663 }
1664
1665
1666
1667 /* This routine is a callback that is called from transport_check_waiting.
1668 This function will evaluate the incoming message versus the previous
1669 message. If the incoming message is using a different local identity then
1670 we will veto this new message. */
1671
1672 static BOOL
1673 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1674 {
1675 uschar * message_local_identity,
1676 * current_local_identity,
1677 * new_sender_address;
1678
1679 current_local_identity =
1680 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1681
1682 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1683 return 0;
1684
1685 message_local_identity =
1686 smtp_local_identity(new_sender_address, s_compare->tblock);
1687
1688 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1689 }
1690
1691
1692
1693 static unsigned
1694 ehlo_response(uschar * buf, unsigned checks)
1695 {
1696 size_t bsize = Ustrlen(buf);
1697
1698 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1699
1700 #ifndef DISABLE_TLS
1701 if ( checks & OPTION_TLS
1702 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1703 #endif
1704 checks &= ~OPTION_TLS;
1705
1706 if ( checks & OPTION_IGNQ
1707 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1708 PCRE_EOPT, NULL, 0) < 0)
1709 checks &= ~OPTION_IGNQ;
1710
1711 if ( checks & OPTION_CHUNKING
1712 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1713 checks &= ~OPTION_CHUNKING;
1714
1715 #ifndef DISABLE_PRDR
1716 if ( checks & OPTION_PRDR
1717 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1718 #endif
1719 checks &= ~OPTION_PRDR;
1720
1721 #ifdef SUPPORT_I18N
1722 if ( checks & OPTION_UTF8
1723 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1724 #endif
1725 checks &= ~OPTION_UTF8;
1726
1727 if ( checks & OPTION_DSN
1728 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1729 checks &= ~OPTION_DSN;
1730
1731 if ( checks & OPTION_PIPE
1732 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1733 PCRE_EOPT, NULL, 0) < 0)
1734 checks &= ~OPTION_PIPE;
1735
1736 if ( checks & OPTION_SIZE
1737 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1738 checks &= ~OPTION_SIZE;
1739
1740 #ifdef SUPPORT_PIPE_CONNECT
1741 if ( checks & OPTION_EARLY_PIPE
1742 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1743 PCRE_EOPT, NULL, 0) < 0)
1744 #endif
1745 checks &= ~OPTION_EARLY_PIPE;
1746
1747 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1748 return checks;
1749 }
1750
1751
1752
1753 /* Callback for emitting a BDAT data chunk header.
1754
1755 If given a nonzero size, first flush any buffered SMTP commands
1756 then emit the command.
1757
1758 Reap previous SMTP command responses if requested, and always reap
1759 the response from a previous BDAT command.
1760
1761 Args:
1762 tctx transport context
1763 chunk_size value for SMTP BDAT command
1764 flags
1765 tc_chunk_last add LAST option to SMTP BDAT command
1766 tc_reap_prev reap response to previous SMTP commands
1767
1768 Returns:
1769 OK or ERROR
1770 DEFER TLS error on first read (EHLO-resp); errno set
1771 */
1772
1773 static int
1774 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1775 unsigned flags)
1776 {
1777 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1778 smtp_context * sx = tctx->smtp_context;
1779 int cmd_count = 0;
1780 int prev_cmd_count;
1781
1782 /* Write SMTP chunk header command. If not reaping responses, note that
1783 there may be more writes (like, the chunk data) done soon. */
1784
1785 if (chunk_size > 0)
1786 {
1787 #ifdef SUPPORT_PIPE_CONNECT
1788 BOOL new_conn = !!(sx->outblock.conn_args);
1789 #endif
1790 if((cmd_count = smtp_write_command(sx,
1791 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1792 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1793 ) < 0) return ERROR;
1794 if (flags & tc_chunk_last)
1795 data_command = string_copy(big_buffer); /* Save for later error message */
1796 #ifdef SUPPORT_PIPE_CONNECT
1797 /* That command write could have been the one that made the connection.
1798 Copy the fd from the client conn ctx (smtp transport specific) to the
1799 generic transport ctx. */
1800
1801 if (new_conn)
1802 tctx->u.fd = sx->outblock.cctx->sock;
1803 #endif
1804 }
1805
1806 prev_cmd_count = cmd_count += sx->cmd_count;
1807
1808 /* Reap responses for any previous, but not one we just emitted */
1809
1810 if (chunk_size > 0)
1811 prev_cmd_count--;
1812 if (sx->pending_BDAT)
1813 prev_cmd_count--;
1814
1815 if (flags & tc_reap_prev && prev_cmd_count > 0)
1816 {
1817 DEBUG(D_transport) debug_printf("look for %d responses"
1818 " for previous pipelined cmds\n", prev_cmd_count);
1819
1820 switch(sync_responses(sx, prev_cmd_count, 0))
1821 {
1822 case 1: /* 2xx (only) => OK */
1823 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1824 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1825 case 0: break; /* No 2xx or 5xx, but no probs */
1826
1827 case -5: errno = ERRNO_TLSFAILURE;
1828 return DEFER;
1829 #ifdef SUPPORT_PIPE_CONNECT
1830 case -4: /* non-2xx for pipelined banner or EHLO */
1831 #endif
1832 case -1: /* Timeout on RCPT */
1833 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1834 }
1835 cmd_count = 1;
1836 if (!sx->pending_BDAT)
1837 pipelining_active = FALSE;
1838 }
1839
1840 /* Reap response for an outstanding BDAT */
1841
1842 if (sx->pending_BDAT)
1843 {
1844 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1845
1846 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1847 ob->command_timeout))
1848 {
1849 if (errno == 0 && sx->buffer[0] == '4')
1850 {
1851 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1852 sx->addrlist->more_errno |=
1853 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1854 }
1855 return ERROR;
1856 }
1857 cmd_count--;
1858 sx->pending_BDAT = FALSE;
1859 pipelining_active = FALSE;
1860 }
1861 else if (chunk_size > 0)
1862 sx->pending_BDAT = TRUE;
1863
1864
1865 sx->cmd_count = cmd_count;
1866 return OK;
1867 }
1868
1869
1870
1871
1872
1873 /*************************************************
1874 * Make connection for given message *
1875 *************************************************/
1876
1877 /*
1878 Arguments:
1879 ctx connection context
1880 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1881 a second attempt after TLS initialization fails
1882
1883 Returns: OK - the connection was made and the delivery attempted;
1884 fd is set in the conn context, tls_out set up.
1885 DEFER - the connection could not be made, or something failed
1886 while setting up the SMTP session, or there was a
1887 non-message-specific error, such as a timeout.
1888 ERROR - helo_data or add_headers or authenticated_sender is
1889 specified for this transport, and the string failed
1890 to expand
1891 */
1892 int
1893 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1894 {
1895 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1896 BOOL pass_message = FALSE;
1897 uschar * message = NULL;
1898 int yield = OK;
1899 #ifndef DISABLE_TLS
1900 uschar * tls_errstr;
1901 #endif
1902
1903 sx->conn_args.ob = ob;
1904
1905 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1906 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1907 sx->ok = FALSE;
1908 sx->send_rset = TRUE;
1909 sx->send_quit = TRUE;
1910 sx->setting_up = TRUE;
1911 sx->esmtp = TRUE;
1912 sx->esmtp_sent = FALSE;
1913 #ifdef SUPPORT_I18N
1914 sx->utf8_needed = FALSE;
1915 #endif
1916 sx->dsn_all_lasthop = TRUE;
1917 #ifdef SUPPORT_DANE
1918 sx->conn_args.dane = FALSE;
1919 sx->dane_required =
1920 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1921 #endif
1922 #ifdef SUPPORT_PIPE_CONNECT
1923 sx->early_pipe_active = sx->early_pipe_ok = FALSE;
1924 sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0;
1925 sx->pending_BANNER = sx->pending_EHLO = FALSE;
1926 #endif
1927
1928 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1929 sx->peer_offered = 0;
1930 sx->avoid_option = 0;
1931 sx->igquotstr = US"";
1932 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1933 #ifdef EXPERIMENTAL_DSN_INFO
1934 sx->smtp_greeting = NULL;
1935 sx->helo_response = NULL;
1936 #endif
1937
1938 smtp_command = US"initial connection";
1939 sx->buffer[0] = '\0';
1940
1941 /* Set up the buffer for reading SMTP response packets. */
1942
1943 sx->inblock.buffer = sx->inbuffer;
1944 sx->inblock.buffersize = sizeof(sx->inbuffer);
1945 sx->inblock.ptr = sx->inbuffer;
1946 sx->inblock.ptrend = sx->inbuffer;
1947
1948 /* Set up the buffer for holding SMTP commands while pipelining */
1949
1950 sx->outblock.buffer = sx->outbuffer;
1951 sx->outblock.buffersize = sizeof(sx->outbuffer);
1952 sx->outblock.ptr = sx->outbuffer;
1953 sx->outblock.cmd_count = 0;
1954 sx->outblock.authenticating = FALSE;
1955 sx->outblock.conn_args = NULL;
1956
1957 /* Reset the parameters of a TLS session. */
1958
1959 tls_out.bits = 0;
1960 tls_out.cipher = NULL; /* the one we may use for this transport */
1961 tls_out.ourcert = NULL;
1962 tls_out.peercert = NULL;
1963 tls_out.peerdn = NULL;
1964 #ifdef USE_OPENSSL
1965 tls_out.sni = NULL;
1966 #endif
1967 tls_out.ocsp = OCSP_NOT_REQ;
1968 #ifdef EXPERIMENTAL_TLS_RESUME
1969 tls_out.resumption = 0;
1970 #endif
1971 tls_out.ver = NULL;
1972
1973 /* Flip the legacy TLS-related variables over to the outbound set in case
1974 they're used in the context of the transport. Don't bother resetting
1975 afterward (when being used by a transport) as we're in a subprocess.
1976 For verify, unflipped once the callout is dealt with */
1977
1978 tls_modify_variables(&tls_out);
1979
1980 #ifdef DISABLE_TLS
1981 if (sx->smtps)
1982 {
1983 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1984 DEFER, FALSE);
1985 return ERROR;
1986 }
1987 #endif
1988
1989 /* Make a connection to the host if this isn't a continued delivery, and handle
1990 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1991 specially so they can be identified for retries. */
1992
1993 if (!continue_hostname)
1994 {
1995 if (sx->verify)
1996 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
1997
1998 /* Get the actual port the connection will use, into sx->conn_args.host */
1999
2000 smtp_port_for_connect(sx->conn_args.host, sx->port);
2001
2002 #ifdef SUPPORT_DANE
2003 /* Do TLSA lookup for DANE */
2004 {
2005 tls_out.dane_verified = FALSE;
2006 tls_out.tlsa_usage = 0;
2007
2008 if (sx->conn_args.host->dnssec == DS_YES)
2009 {
2010 int rc;
2011 if( sx->dane_required
2012 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2013 )
2014 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2015 {
2016 case OK: sx->conn_args.dane = TRUE;
2017 ob->tls_tempfail_tryclear = FALSE;
2018 break;
2019 case FAIL_FORCED: break;
2020 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2021 string_sprintf("DANE error: tlsa lookup %s",
2022 rc_to_string(rc)),
2023 rc, FALSE);
2024 # ifndef DISABLE_EVENT
2025 (void) event_raise(sx->conn_args.tblock->event_action,
2026 US"dane:fail", sx->dane_required
2027 ? US"dane-required" : US"dnssec-invalid");
2028 # endif
2029 return rc;
2030 }
2031 }
2032 else if (sx->dane_required)
2033 {
2034 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2035 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2036 FAIL, FALSE);
2037 # ifndef DISABLE_EVENT
2038 (void) event_raise(sx->conn_args.tblock->event_action,
2039 US"dane:fail", US"dane-required");
2040 # endif
2041 return FAIL;
2042 }
2043 }
2044 #endif /*DANE*/
2045
2046 /* Make the TCP connection */
2047
2048 sx->cctx.tls_ctx = NULL;
2049 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2050 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2051
2052 #ifdef SUPPORT_PIPE_CONNECT
2053 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2054 sx->conn_args.host) == OK)
2055
2056 /* We don't find out the local ip address until the connect, so if
2057 the helo string might use it avoid doing early-pipelining. */
2058
2059 if ( !sx->helo_data
2060 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2061 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2062 )
2063 {
2064 sx->early_pipe_ok = TRUE;
2065 if ( read_ehlo_cache_entry(sx)
2066 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2067 {
2068 DEBUG(D_transport)
2069 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2070 sx->early_pipe_active = TRUE;
2071 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2072 }
2073 }
2074 else DEBUG(D_transport)
2075 debug_printf("helo needs $sending_ip_address\n");
2076
2077 if (sx->early_pipe_active)
2078 sx->outblock.conn_args = &sx->conn_args;
2079 else
2080 #endif
2081 {
2082 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2083 {
2084 set_errno_nohost(sx->addrlist,
2085 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2086 sx->verify ? US strerror(errno) : NULL,
2087 DEFER, FALSE);
2088 sx->send_quit = FALSE;
2089 return DEFER;
2090 }
2091 }
2092 /* Expand the greeting message while waiting for the initial response. (Makes
2093 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2094 delayed till here so that $sending_interface and $sending_port are set. */
2095 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2096 will be? Somehow I doubt it. */
2097
2098 if (sx->helo_data)
2099 if (!(sx->helo_data = expand_string(sx->helo_data)))
2100 if (sx->verify)
2101 log_write(0, LOG_MAIN|LOG_PANIC,
2102 "<%s>: failed to expand transport's helo_data value for callout: %s",
2103 sx->addrlist->address, expand_string_message);
2104
2105 #ifdef SUPPORT_I18N
2106 if (sx->helo_data)
2107 {
2108 expand_string_message = NULL;
2109 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2110 &expand_string_message)),
2111 expand_string_message)
2112 if (sx->verify)
2113 log_write(0, LOG_MAIN|LOG_PANIC,
2114 "<%s>: failed to expand transport's helo_data value for callout: %s",
2115 sx->addrlist->address, expand_string_message);
2116 else
2117 sx->helo_data = NULL;
2118 }
2119 #endif
2120
2121 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2122 is nevertheless a reasonably clean way of programming this kind of logic,
2123 where you want to escape on any error. */
2124
2125 if (!sx->smtps)
2126 {
2127 #ifdef SUPPORT_PIPE_CONNECT
2128 if (sx->early_pipe_active)
2129 {
2130 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2131 sx->outblock.cmd_count = 1;
2132 }
2133 else
2134 #endif
2135 {
2136 #ifdef TCP_QUICKACK
2137 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2138 sizeof(off));
2139 #endif
2140 if (!smtp_reap_banner(sx))
2141 goto RESPONSE_FAILED;
2142 }
2143
2144 #ifndef DISABLE_EVENT
2145 {
2146 uschar * s;
2147 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2148 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2149 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2150 if (s)
2151 {
2152 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2153 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2154 DEFER, FALSE);
2155 yield = DEFER;
2156 goto SEND_QUIT;
2157 }
2158 }
2159 #endif
2160
2161 /* Now check if the helo_data expansion went well, and sign off cleanly if
2162 it didn't. */
2163
2164 if (!sx->helo_data)
2165 {
2166 message = string_sprintf("failed to expand helo_data: %s",
2167 expand_string_message);
2168 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2169 yield = DEFER;
2170 goto SEND_QUIT;
2171 }
2172 }
2173
2174 /** Debugging without sending a message
2175 sx->addrlist->transport_return = DEFER;
2176 goto SEND_QUIT;
2177 **/
2178
2179 /* Errors that occur after this point follow an SMTP command, which is
2180 left in big_buffer by smtp_write_command() for use in error messages. */
2181
2182 smtp_command = big_buffer;
2183
2184 /* Tell the remote who we are...
2185
2186 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2187 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2188 greeting is of this form. The assumption was that the far end supports it
2189 properly... but experience shows that there are some that give 5xx responses,
2190 even though the banner includes "ESMTP" (there's a bloody-minded one that
2191 says "ESMTP not spoken here"). Cope with that case.
2192
2193 September 2000: Time has passed, and it seems reasonable now to always send
2194 EHLO at the start. It is also convenient to make the change while installing
2195 the TLS stuff.
2196
2197 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2198 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2199 would be no way to send out the mails, so there is now a host list
2200 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2201 PIPELINING problem as well. Maybe it can also be useful to cure other
2202 problems with broken servers.
2203
2204 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2205 Then somebody tried it with a Microsoft mailer... It seems that all other
2206 mailers use upper case for some reason (the RFC is quite clear about case
2207 independence) so, for peace of mind, I gave in. */
2208
2209 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2210
2211 /* Alas; be careful, since this goto is not an error-out, so conceivably
2212 we might set data between here and the target which we assume to exist
2213 and be usable. I can see this coming back to bite us. */
2214 #ifndef DISABLE_TLS
2215 if (sx->smtps)
2216 {
2217 smtp_peer_options |= OPTION_TLS;
2218 suppress_tls = FALSE;
2219 ob->tls_tempfail_tryclear = FALSE;
2220 smtp_command = US"SSL-on-connect";
2221 goto TLS_NEGOTIATE;
2222 }
2223 #endif
2224
2225 if (sx->esmtp)
2226 {
2227 if (smtp_write_command(sx,
2228 #ifdef SUPPORT_PIPE_CONNECT
2229 sx->early_pipe_active ? SCMD_BUFFER :
2230 #endif
2231 SCMD_FLUSH,
2232 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2233 goto SEND_FAILED;
2234 sx->esmtp_sent = TRUE;
2235
2236 #ifdef SUPPORT_PIPE_CONNECT
2237 if (sx->early_pipe_active)
2238 {
2239 sx->pending_EHLO = TRUE;
2240
2241 /* If we have too many authenticators to handle and might need to AUTH
2242 for this transport, pipeline no further as we will need the
2243 list of auth methods offered. Reap the banner and EHLO. */
2244
2245 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2246 && f.smtp_in_early_pipe_no_auth)
2247 {
2248 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2249 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2250 goto SEND_FAILED;
2251 if (sync_responses(sx, 2, 0) != 0)
2252 {
2253 HDEBUG(D_transport)
2254 debug_printf("failed reaping pipelined cmd responses\n");
2255 goto RESPONSE_FAILED;
2256 }
2257 sx->early_pipe_active = FALSE;
2258 }
2259 }
2260 else
2261 #endif
2262 if (!smtp_reap_ehlo(sx))
2263 goto RESPONSE_FAILED;
2264 }
2265 else
2266 DEBUG(D_transport)
2267 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2268
2269 #ifdef SUPPORT_PIPE_CONNECT
2270 if (!sx->early_pipe_active)
2271 #endif
2272 if (!sx->esmtp)
2273 {
2274 BOOL good_response;
2275 int n = sizeof(sx->buffer);
2276 uschar * rsp = sx->buffer;
2277
2278 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2279 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2280
2281 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2282 goto SEND_FAILED;
2283 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2284 #ifdef EXPERIMENTAL_DSN_INFO
2285 sx->helo_response = string_copy(rsp);
2286 #endif
2287 if (!good_response)
2288 {
2289 /* Handle special logging for a closed connection after HELO
2290 when had previously sent EHLO */
2291
2292 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2293 {
2294 errno = ERRNO_SMTPCLOSED;
2295 goto EHLOHELO_FAILED;
2296 }
2297 memmove(sx->buffer, rsp, Ustrlen(rsp));
2298 goto RESPONSE_FAILED;
2299 }
2300 }
2301
2302 if (sx->esmtp || sx->lmtp)
2303 {
2304 #ifdef SUPPORT_PIPE_CONNECT
2305 if (!sx->early_pipe_active)
2306 #endif
2307 {
2308 sx->peer_offered = ehlo_response(sx->buffer,
2309 OPTION_TLS /* others checked later */
2310 #ifdef SUPPORT_PIPE_CONNECT
2311 | (sx->early_pipe_ok
2312 ? OPTION_IGNQ
2313 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2314 #ifdef SUPPORT_I18N
2315 | OPTION_UTF8
2316 #endif
2317 | OPTION_EARLY_PIPE
2318 : 0
2319 )
2320 #endif
2321 );
2322 #ifdef SUPPORT_PIPE_CONNECT
2323 if (sx->early_pipe_ok)
2324 {
2325 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2326
2327 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2328 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2329 {
2330 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2331 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2332 write_ehlo_cache_entry(sx);
2333 }
2334 }
2335 #endif
2336 }
2337
2338 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2339
2340 #ifndef DISABLE_TLS
2341 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2342 #endif
2343 }
2344 }
2345
2346 /* For continuing deliveries down the same channel, having re-exec'd the socket
2347 is the standard input; for a socket held open from verify it is recorded
2348 in the cutthrough context block. Either way we don't need to redo EHLO here
2349 (but may need to do so for TLS - see below).
2350 Set up the pointer to where subsequent commands will be left, for
2351 error messages. Note that smtp_peer_options will have been
2352 set from the command line if they were set in the process that passed the
2353 connection on. */
2354
2355 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2356 as the continue goes via transport_pass_socket() and doublefork and exec.
2357 It does not wait. Unclear how we keep separate host's responses
2358 separate - we could match up by host ip+port as a bodge. */
2359
2360 else
2361 {
2362 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2363 {
2364 sx->cctx = cutthrough.cctx;
2365 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2366 }
2367 else
2368 {
2369 sx->cctx.sock = 0; /* stdin */
2370 sx->cctx.tls_ctx = NULL;
2371 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2372 }
2373 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2374 smtp_command = big_buffer;
2375 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2376
2377 /* For a continued connection with TLS being proxied for us, or a
2378 held-open verify connection with TLS, nothing more to do. */
2379
2380 if ( continue_proxy_cipher
2381 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2382 && cutthrough.is_tls)
2383 )
2384 {
2385 sx->peer_offered = smtp_peer_options;
2386 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2387 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2388 continue_proxy_cipher ? "proxied" : "verify conn with");
2389 return OK;
2390 }
2391 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2392 }
2393
2394 /* If TLS is available on this connection, whether continued or not, attempt to
2395 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2396 send another EHLO - the server may give a different answer in secure mode. We
2397 use a separate buffer for reading the response to STARTTLS so that if it is
2398 negative, the original EHLO data is available for subsequent analysis, should
2399 the client not be required to use TLS. If the response is bad, copy the buffer
2400 for error analysis. */
2401
2402 #ifndef DISABLE_TLS
2403 if ( smtp_peer_options & OPTION_TLS
2404 && !suppress_tls
2405 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2406 && ( !sx->verify
2407 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2408 ) )
2409 {
2410 uschar buffer2[4096];
2411
2412 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2413 goto SEND_FAILED;
2414
2415 #ifdef SUPPORT_PIPE_CONNECT
2416 /* If doing early-pipelining reap the banner and EHLO-response but leave
2417 the response for the STARTTLS we just sent alone. */
2418
2419 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2420 {
2421 HDEBUG(D_transport)
2422 debug_printf("failed reaping pipelined cmd responses\n");
2423 goto RESPONSE_FAILED;
2424 }
2425 #endif
2426
2427 /* If there is an I/O error, transmission of this message is deferred. If
2428 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2429 false, we also defer. However, if there is a temporary rejection of STARTTLS
2430 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2431 STARTTLS, we carry on. This means we will try to send the message in clear,
2432 unless the host is in hosts_require_tls (tested below). */
2433
2434 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2435 {
2436 if ( errno != 0
2437 || buffer2[0] == 0
2438 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2439 )
2440 {
2441 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2442 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2443 goto RESPONSE_FAILED;
2444 }
2445 }
2446
2447 /* STARTTLS accepted: try to negotiate a TLS session. */
2448
2449 else
2450 TLS_NEGOTIATE:
2451 {
2452 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2453 {
2454 /* TLS negotiation failed; give an error. From outside, this function may
2455 be called again to try in clear on a new connection, if the options permit
2456 it for this host. */
2457 #ifdef USE_GNUTLS
2458 GNUTLS_CONN_FAILED:
2459 #endif
2460 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2461
2462 # ifdef SUPPORT_DANE
2463 if (sx->conn_args.dane)
2464 {
2465 log_write(0, LOG_MAIN,
2466 "DANE attempt failed; TLS connection to %s [%s]: %s",
2467 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2468 # ifndef DISABLE_EVENT
2469 (void) event_raise(sx->conn_args.tblock->event_action,
2470 US"dane:fail", US"validation-failure"); /* could do with better detail */
2471 # endif
2472 }
2473 # endif
2474
2475 errno = ERRNO_TLSFAILURE;
2476 message = string_sprintf("TLS session: %s", tls_errstr);
2477 sx->send_quit = FALSE;
2478 goto TLS_FAILED;
2479 }
2480
2481 /* TLS session is set up */
2482
2483 smtp_peer_options_wrap = smtp_peer_options;
2484 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2485 if (addr->transport_return == PENDING_DEFER)
2486 {
2487 addr->cipher = tls_out.cipher;
2488 addr->ourcert = tls_out.ourcert;
2489 addr->peercert = tls_out.peercert;
2490 addr->peerdn = tls_out.peerdn;
2491 addr->ocsp = tls_out.ocsp;
2492 addr->tlsver = tls_out.ver;
2493 }
2494 }
2495 }
2496
2497 /* if smtps, we'll have smtp_command set to something else; always safe to
2498 reset it here. */
2499 smtp_command = big_buffer;
2500
2501 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2502 helo_data is null, we are dealing with a connection that was passed from
2503 another process, and so we won't have expanded helo_data above. We have to
2504 expand it here. $sending_ip_address and $sending_port are set up right at the
2505 start of the Exim process (in exim.c). */
2506
2507 if (tls_out.active.sock >= 0)
2508 {
2509 uschar * greeting_cmd;
2510
2511 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2512 {
2513 uschar *message = string_sprintf("failed to expand helo_data: %s",
2514 expand_string_message);
2515 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2516 yield = DEFER;
2517 goto SEND_QUIT;
2518 }
2519
2520 #ifdef SUPPORT_PIPE_CONNECT
2521 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2522 We're unlikely to get the group sent and delivered before the server sends its
2523 banner, but it's still worth sending as a group.
2524 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2525 the reverse. */
2526
2527 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2528 {
2529 sx->peer_offered = sx->ehlo_resp.crypted_features;
2530 if ((sx->early_pipe_active =
2531 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2532 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2533 }
2534 #endif
2535
2536 /* For SMTPS we need to wait for the initial OK response. */
2537 if (sx->smtps)
2538 #ifdef SUPPORT_PIPE_CONNECT
2539 if (sx->early_pipe_active)
2540 {
2541 sx->pending_BANNER = TRUE;
2542 sx->outblock.cmd_count = 1;
2543 }
2544 else
2545 #endif
2546 if (!smtp_reap_banner(sx))
2547 goto RESPONSE_FAILED;
2548
2549 if (sx->lmtp)
2550 greeting_cmd = US"LHLO";
2551 else if (sx->esmtp)
2552 greeting_cmd = US"EHLO";
2553 else
2554 {
2555 greeting_cmd = US"HELO";
2556 DEBUG(D_transport)
2557 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2558 }
2559
2560 if (smtp_write_command(sx,
2561 #ifdef SUPPORT_PIPE_CONNECT
2562 sx->early_pipe_active ? SCMD_BUFFER :
2563 #endif
2564 SCMD_FLUSH,
2565 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2566 goto SEND_FAILED;
2567
2568 #ifdef SUPPORT_PIPE_CONNECT
2569 if (sx->early_pipe_active)
2570 sx->pending_EHLO = TRUE;
2571 else
2572 #endif
2573 {
2574 if (!smtp_reap_ehlo(sx))
2575 #ifdef USE_GNUTLS
2576 {
2577 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2578 cert late, under TLS1.3 - which means here; the first time we try to
2579 receive crypted data. Treat it as if it was a connect-time failure.
2580 See also the early-pipe equivalent... which will be hard; every call
2581 to sync_responses will need to check the result.
2582 It would be nicer to have GnuTLS check the cert during the handshake.
2583 Can it do that, with all the flexibility we need? */
2584
2585 tls_errstr = US"error on first read";
2586 goto GNUTLS_CONN_FAILED;
2587 }
2588 #else
2589 goto RESPONSE_FAILED;
2590 #endif
2591 smtp_peer_options = 0;
2592 }
2593 }
2594
2595 /* If the host is required to use a secure channel, ensure that we
2596 have one. */
2597
2598 else if ( sx->smtps
2599 # ifdef SUPPORT_DANE
2600 || sx->conn_args.dane
2601 # endif
2602 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2603 )
2604 {
2605 errno = ERRNO_TLSREQUIRED;
2606 message = string_sprintf("a TLS session is required, but %s",
2607 smtp_peer_options & OPTION_TLS
2608 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2609 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2610 if (sx->conn_args.dane)
2611 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2612 smtp_peer_options & OPTION_TLS
2613 ? US"validation-failure" /* could do with better detail */
2614 : US"starttls-not-supported");
2615 # endif
2616 goto TLS_FAILED;
2617 }
2618 #endif /*DISABLE_TLS*/
2619
2620 /* If TLS is active, we have just started it up and re-done the EHLO command,
2621 so its response needs to be analyzed. If TLS is not active and this is a
2622 continued session down a previously-used socket, we haven't just done EHLO, so
2623 we skip this. */
2624
2625 if (continue_hostname == NULL
2626 #ifndef DISABLE_TLS
2627 || tls_out.active.sock >= 0
2628 #endif
2629 )
2630 {
2631 if (sx->esmtp || sx->lmtp)
2632 {
2633 #ifdef SUPPORT_PIPE_CONNECT
2634 if (!sx->early_pipe_active)
2635 #endif
2636 {
2637 sx->peer_offered = ehlo_response(sx->buffer,
2638 0 /* no TLS */
2639 #ifdef SUPPORT_PIPE_CONNECT
2640 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2641 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2642 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2643 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2644
2645 #else
2646
2647 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2648 | OPTION_CHUNKING
2649 | OPTION_PRDR
2650 # ifdef SUPPORT_I18N
2651 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2652 /*XXX if we hand peercaps on to continued-conn processes,
2653 must not depend on this addr */
2654 # endif
2655 | OPTION_DSN
2656 | OPTION_PIPE
2657 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2658 #endif
2659 );
2660 #ifdef SUPPORT_PIPE_CONNECT
2661 if (tls_out.active.sock >= 0)
2662 sx->ehlo_resp.crypted_features = sx->peer_offered;
2663 #endif
2664 }
2665
2666 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2667 lmtp_ignore_quota option was set. */
2668
2669 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2670
2671 /* If the response to EHLO specified support for the SIZE parameter, note
2672 this, provided size_addition is non-negative. */
2673
2674 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2675
2676 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2677 the current host, esmtp will be false, so PIPELINING can never be used. If
2678 the current host matches hosts_avoid_pipelining, don't do it. */
2679
2680 if ( sx->peer_offered & OPTION_PIPE
2681 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2682 smtp_peer_options |= OPTION_PIPE;
2683
2684 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2685 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2686
2687 if ( sx->peer_offered & OPTION_CHUNKING
2688 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2689 sx->peer_offered &= ~OPTION_CHUNKING;
2690
2691 if (sx->peer_offered & OPTION_CHUNKING)
2692 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2693
2694 #ifndef DISABLE_PRDR
2695 if ( sx->peer_offered & OPTION_PRDR
2696 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2697 sx->peer_offered &= ~OPTION_PRDR;
2698
2699 if (sx->peer_offered & OPTION_PRDR)
2700 DEBUG(D_transport) debug_printf("PRDR usable\n");
2701 #endif
2702
2703 /* Note if the server supports DSN */
2704 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2705 DEBUG(D_transport) debug_printf("%susing DSN\n",
2706 sx->peer_offered & OPTION_DSN ? "" : "not ");
2707
2708 #ifdef SUPPORT_PIPE_CONNECT
2709 if ( sx->early_pipe_ok
2710 && !sx->early_pipe_active
2711 && tls_out.active.sock >= 0
2712 && smtp_peer_options & OPTION_PIPE
2713 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2714 & OPTION_EARLY_PIPE)
2715 {
2716 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2717 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2718 write_ehlo_cache_entry(sx);
2719 }
2720 #endif
2721
2722 /* Note if the response to EHLO specifies support for the AUTH extension.
2723 If it has, check that this host is one we want to authenticate to, and do
2724 the business. The host name and address must be available when the
2725 authenticator's client driver is running. */
2726
2727 switch (yield = smtp_auth(sx))
2728 {
2729 default: goto SEND_QUIT;
2730 case OK: break;
2731 case FAIL_SEND: goto SEND_FAILED;
2732 case FAIL: goto RESPONSE_FAILED;
2733 }
2734 }
2735 }
2736 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2737
2738 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2739 message-specific. */
2740
2741 sx->setting_up = FALSE;
2742
2743 #ifdef SUPPORT_I18N
2744 if (sx->addrlist->prop.utf8_msg)
2745 {
2746 uschar * s;
2747
2748 /* If the transport sets a downconversion mode it overrides any set by ACL
2749 for the message. */
2750
2751 if ((s = ob->utf8_downconvert))
2752 {
2753 if (!(s = expand_string(s)))
2754 {
2755 message = string_sprintf("failed to expand utf8_downconvert: %s",
2756 expand_string_message);
2757 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
2758 yield = DEFER;
2759 goto SEND_QUIT;
2760 }
2761 switch (*s)
2762 {
2763 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2764 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2765 break;
2766 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2767 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2768 break;
2769 case '-': if (s[1] == '1')
2770 {
2771 sx->addrlist->prop.utf8_downcvt = FALSE;
2772 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2773 }
2774 break;
2775 }
2776 }
2777
2778 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2779 && !sx->addrlist->prop.utf8_downcvt_maybe;
2780 DEBUG(D_transport) if (!sx->utf8_needed)
2781 debug_printf("utf8: %s downconvert\n",
2782 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2783 }
2784
2785 /* If this is an international message we need the host to speak SMTPUTF8 */
2786 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2787 {
2788 errno = ERRNO_UTF8_FWD;
2789 goto RESPONSE_FAILED;
2790 }
2791 #endif /*SUPPORT_I18N*/
2792
2793 return OK;
2794
2795
2796 {
2797 int code;
2798
2799 RESPONSE_FAILED:
2800 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2801 {
2802 /* There is a testing facility for simulating a connection timeout, as I
2803 can't think of any other way of doing this. It converts a connection
2804 refused into a timeout if the timeout is set to 999999. This is done for
2805 a 3whs connection in ip_connect(), but a TFO connection does not error
2806 there - instead it gets ECONNREFUSED on the first data read. Tracking
2807 that a TFO really was done is too hard, or we would set a
2808 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2809 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2810 cmd-timeout. */
2811
2812 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2813 errno = ETIMEDOUT;
2814 set_errno_nohost(sx->addrlist,
2815 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2816 sx->verify ? US strerror(errno) : NULL,
2817 DEFER, FALSE);
2818 sx->send_quit = FALSE;
2819 return DEFER;
2820 }
2821
2822 /* really an error on an SMTP read */
2823 message = NULL;
2824 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2825 sx->buffer, &code, &message, &pass_message);
2826 yield = DEFER;
2827 goto FAILED;
2828
2829 SEND_FAILED:
2830 code = '4';
2831 message = US string_sprintf("send() to %s [%s] failed: %s",
2832 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2833 sx->send_quit = FALSE;
2834 yield = DEFER;
2835 goto FAILED;
2836
2837 EHLOHELO_FAILED:
2838 code = '4';
2839 message = string_sprintf("Remote host closed connection in response to %s"
2840 " (EHLO response was: %s)", smtp_command, sx->buffer);
2841 sx->send_quit = FALSE;
2842 yield = DEFER;
2843 goto FAILED;
2844
2845 /* This label is jumped to directly when a TLS negotiation has failed,
2846 or was not done for a host for which it is required. Values will be set
2847 in message and errno, and setting_up will always be true. Treat as
2848 a temporary error. */
2849
2850 #ifndef DISABLE_TLS
2851 TLS_FAILED:
2852 code = '4', yield = DEFER;
2853 goto FAILED;
2854 #endif
2855
2856 /* The failure happened while setting up the call; see if the failure was
2857 a 5xx response (this will either be on connection, or following HELO - a 5xx
2858 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2859 fail all addresses, as this host is never going to accept them. For other
2860 errors during setting up (timeouts or whatever), defer all addresses, and
2861 yield DEFER, so that the host is not tried again for a while.
2862
2863 XXX This peeking for another host feels like a layering violation. We want
2864 to note the host as unusable, but down here we shouldn't know if this was
2865 the last host to try for the addr(list). Perhaps the upper layer should be
2866 the one to do set_errno() ? The problem is that currently the addr is where
2867 errno etc. are stashed, but until we run out of hosts to try the errors are
2868 host-specific. Maybe we should enhance the host_item definition? */
2869
2870 FAILED:
2871 sx->ok = FALSE; /* For when reached by GOTO */
2872 set_errno(sx->addrlist, errno, message,
2873 sx->conn_args.host->next
2874 ? DEFER
2875 : code == '5'
2876 #ifdef SUPPORT_I18N
2877 || errno == ERRNO_UTF8_FWD
2878 #endif
2879 ? FAIL : DEFER,
2880 pass_message,
2881 errno == ECONNREFUSED ? NULL : sx->conn_args.host
2882 #ifdef EXPERIMENTAL_DSN_INFO
2883 , sx->smtp_greeting, sx->helo_response
2884 #endif
2885 );
2886 }
2887
2888
2889 SEND_QUIT:
2890
2891 if (sx->send_quit)
2892 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2893
2894 #ifndef DISABLE_TLS
2895 if (sx->cctx.tls_ctx)
2896 {
2897 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2898 sx->cctx.tls_ctx = NULL;
2899 }
2900 #endif
2901
2902 /* Close the socket, and return the appropriate value, first setting
2903 works because the NULL setting is passed back to the calling process, and
2904 remote_max_parallel is forced to 1 when delivering over an existing connection,
2905 */
2906
2907 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2908 if (sx->send_quit)
2909 {
2910 shutdown(sx->cctx.sock, SHUT_WR);
2911 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2912 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2913 i--; /* drain socket */
2914 sx->send_quit = FALSE;
2915 }
2916 (void)close(sx->cctx.sock);
2917 sx->cctx.sock = -1;
2918
2919 #ifndef DISABLE_EVENT
2920 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2921 #endif
2922
2923 continue_transport = NULL;
2924 continue_hostname = NULL;
2925 return yield;
2926 }
2927
2928
2929
2930
2931 /* Create the string of options that will be appended to the MAIL FROM:
2932 in the connection context buffer */
2933
2934 static int
2935 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2936 {
2937 uschar * p = sx->buffer;
2938 address_item * addr;
2939 int address_count;
2940
2941 *p = 0;
2942
2943 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2944 send it, adding something to the message size to allow for imprecision
2945 and things that get added en route. Exim keeps the number of lines
2946 in a message, so we can give an accurate value for the original message, but we
2947 need some additional to handle added headers. (Double "." characters don't get
2948 included in the count.) */
2949
2950 if ( message_size > 0
2951 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2952 {
2953 /*XXX problem here under spool_files_wireformat?
2954 Or just forget about lines? Or inflate by a fixed proportion? */
2955
2956 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2957 while (*p) p++;
2958 }
2959
2960 #ifndef DISABLE_PRDR
2961 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2962 request that */
2963
2964 sx->prdr_active = FALSE;
2965 if (sx->peer_offered & OPTION_PRDR)
2966 for (address_item * addr = addrlist; addr; addr = addr->next)
2967 if (addr->transport_return == PENDING_DEFER)
2968 {
2969 for (addr = addr->next; addr; addr = addr->next)
2970 if (addr->transport_return == PENDING_DEFER)
2971 { /* at least two recipients to send */
2972 sx->prdr_active = TRUE;
2973 sprintf(CS p, " PRDR"); p += 5;
2974 break;
2975 }
2976 break;
2977 }
2978 #endif
2979
2980 #ifdef SUPPORT_I18N
2981 /* If it supports internationalised messages, and this meesage need that,
2982 request it */
2983
2984 if ( sx->peer_offered & OPTION_UTF8
2985 && addrlist->prop.utf8_msg
2986 && !addrlist->prop.utf8_downcvt
2987 )
2988 Ustrcpy(p, US" SMTPUTF8"), p += 9;
2989 #endif
2990
2991 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2992 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2993 addr && address_count < sx->max_rcpt;
2994 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2995 {
2996 address_count++;
2997 if (!(addr->dsn_flags & rf_dsnlasthop))
2998 {
2999 sx->dsn_all_lasthop = FALSE;
3000 break;
3001 }
3002 }
3003
3004 /* Add any DSN flags to the mail command */
3005
3006 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3007 {
3008 if (dsn_ret == dsn_ret_hdrs)
3009 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3010 else if (dsn_ret == dsn_ret_full)
3011 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3012
3013 if (dsn_envid)
3014 {
3015 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3016 while (*p) p++;
3017 }
3018 }
3019
3020 /* If an authenticated_sender override has been specified for this transport
3021 instance, expand it. If the expansion is forced to fail, and there was already
3022 an authenticated_sender for this message, the original value will be used.
3023 Other expansion failures are serious. An empty result is ignored, but there is
3024 otherwise no check - this feature is expected to be used with LMTP and other
3025 cases where non-standard addresses (e.g. without domains) might be required. */
3026
3027 if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->conn_args.ob))
3028 return ERROR;
3029
3030 return OK;
3031 }
3032
3033
3034 static void
3035 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3036 {
3037 uschar * p = sx->buffer;
3038 *p = 0;
3039
3040 /* Add any DSN flags to the rcpt command */
3041
3042 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3043 {
3044 if (addr->dsn_flags & rf_dsnflags)
3045 {
3046 BOOL first = TRUE;
3047
3048 Ustrcpy(p, US" NOTIFY=");
3049 while (*p) p++;
3050 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3051 {
3052 if (!first) *p++ = ',';
3053 first = FALSE;
3054 Ustrcpy(p, rf_names[i]);
3055 while (*p) p++;
3056 }
3057 }
3058
3059 if (addr->dsn_orcpt)
3060 {
3061 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3062 addr->dsn_orcpt);
3063 while (*p) p++;
3064 }
3065 }
3066 }
3067
3068
3069
3070 /*
3071 Return:
3072 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3073 -1 MAIL response error
3074 -2 any non-MAIL read i/o error
3075 -3 non-MAIL response timeout
3076 -4 internal error; channel still usable
3077 -5 transmit failed
3078 */
3079
3080 int
3081 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3082 {
3083 address_item * addr;
3084 int address_count;
3085 int rc;
3086
3087 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3088 {
3089 *yield = ERROR;
3090 return -4;
3091 }
3092
3093 /* From here until we send the DATA command, we can make use of PIPELINING
3094 if the server host supports it. The code has to be able to check the responses
3095 at any point, for when the buffer fills up, so we write it totally generally.
3096 When PIPELINING is off, each command written reports that it has flushed the
3097 buffer. */
3098
3099 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3100
3101 {
3102 uschar * s = sx->from_addr;
3103 #ifdef SUPPORT_I18N
3104 uschar * errstr = NULL;
3105
3106 /* If we must downconvert, do the from-address here. Remember we had to
3107 for the to-addresses (done below), and also (ugly) for re-doing when building
3108 the delivery log line. */
3109
3110 if ( sx->addrlist->prop.utf8_msg
3111 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3112 )
3113 {
3114 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3115 {
3116 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3117 *yield = ERROR;
3118 return -4;
3119 }
3120 setflag(sx->addrlist, af_utf8_downcvt);
3121 }
3122 #endif
3123
3124 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3125 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3126 }
3127
3128 mail_command = string_copy(big_buffer); /* Save for later error message */
3129
3130 switch(rc)
3131 {
3132 case -1: /* Transmission error */
3133 return -5;
3134
3135 case +1: /* Cmd was sent */
3136 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3137 (SOB sx->conn_args.ob)->command_timeout))
3138 {
3139 if (errno == 0 && sx->buffer[0] == '4')
3140 {
3141 errno = ERRNO_MAIL4XX;
3142 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3143 }
3144 return -1;
3145 }
3146 sx->pending_MAIL = FALSE;
3147 break;
3148
3149 /* otherwise zero: command queued for pipeline */
3150 }
3151
3152 /* Pass over all the relevant recipient addresses for this host, which are the
3153 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3154 several before we have to read the responses for those seen so far. This
3155 checking is done by a subroutine because it also needs to be done at the end.
3156 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3157 the next one if not all are sent.
3158
3159 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3160 last address because we want to abort if any recipients have any kind of
3161 problem, temporary or permanent. We know that all recipient addresses will have
3162 the PENDING_DEFER status, because only one attempt is ever made, and we know
3163 that max_rcpt will be large, so all addresses will be done at once.
3164
3165 For verify we flush the pipeline after any (the only) rcpt address. */
3166
3167 for (addr = sx->first_addr, address_count = 0;
3168 addr && address_count < sx->max_rcpt;
3169 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3170 {
3171 int count;
3172 BOOL no_flush;
3173 uschar * rcpt_addr;
3174
3175 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3176 ? dsn_support_yes : dsn_support_no;
3177
3178 address_count++;
3179 no_flush = pipelining_active && !sx->verify
3180 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3181
3182 build_rcptcmd_options(sx, addr);
3183
3184 /* Now send the RCPT command, and process outstanding responses when
3185 necessary. After a timeout on RCPT, we just end the function, leaving the
3186 yield as OK, because this error can often mean that there is a problem with
3187 just one address, so we don't want to delay the host. */
3188
3189 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3190
3191 #ifdef SUPPORT_I18N
3192 if ( testflag(sx->addrlist, af_utf8_downcvt)
3193 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3194 )
3195 {
3196 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3197 errno = ERRNO_EXPANDFAIL;
3198 return -5; /*XXX too harsh? */
3199 }
3200 #endif
3201
3202 count = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3203 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3204
3205 if (count < 0) return -5;
3206 if (count > 0)
3207 {
3208 switch(sync_responses(sx, count, 0))
3209 {
3210 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3211 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3212 break;
3213
3214 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3215 if (!sx->lmtp) /* can't tell about progress yet */
3216 sx->completed_addr = TRUE;
3217 case 0: /* No 2xx or 5xx, but no probs */
3218 break;
3219
3220 case -1: return -3; /* Timeout on RCPT */
3221 case -2: return -2; /* non-MAIL read i/o error */
3222 default: return -1; /* any MAIL error */
3223
3224 #ifdef SUPPORT_PIPE_CONNECT
3225 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3226 case -5: return -1; /* TLS first-read error */
3227 #endif
3228 }
3229 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
3230 }
3231 } /* Loop for next address */
3232
3233 sx->next_addr = addr;
3234 return 0;
3235 }
3236
3237
3238 #ifndef DISABLE_TLS
3239 /*****************************************************
3240 * Proxy TLS connection for another transport process *
3241 ******************************************************/
3242 /*
3243 Close the unused end of the pipe, fork once more, then use the given buffer
3244 as a staging area, and select on both the given fd and the TLS'd client-fd for
3245 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3246 Do blocking full-size writes, and reads under a timeout. Once both input
3247 channels are closed, exit the process.
3248
3249 Arguments:
3250 ct_ctx tls context
3251 buf space to use for buffering
3252 bufsiz size of buffer
3253 pfd pipe filedescriptor array; [0] is comms to proxied process
3254 timeout per-read timeout, seconds
3255
3256 Does not return.
3257 */
3258
3259 void
3260 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3261 int timeout)
3262 {
3263 fd_set rfds, efds;
3264 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3265 int rc, i;
3266
3267 close(pfd[1]);
3268 if ((rc = fork()))
3269 {
3270 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
3271 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3272 }
3273
3274 testharness_pause_ms(100); /* let parent debug out */
3275 set_process_info("proxying TLS connection for continued transport");
3276 FD_ZERO(&rfds);
3277 FD_SET(tls_out.active.sock, &rfds);
3278 FD_SET(pfd[0], &rfds);
3279
3280 for (int fd_bits = 3; fd_bits; )
3281 {
3282 time_t time_left = timeout;
3283 time_t time_start = time(NULL);
3284
3285 /* wait for data */
3286 efds = rfds;
3287 do
3288 {
3289 struct timeval tv = { time_left, 0 };
3290
3291 rc = select(max_fd,
3292 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3293
3294 if (rc < 0 && errno == EINTR)
3295 if ((time_left -= time(NULL) - time_start) > 0) continue;
3296
3297 if (rc <= 0)
3298 {
3299 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3300 goto done;
3301 }
3302
3303 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3304 {
3305 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3306 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3307 goto done;
3308 }
3309 }
3310 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3311
3312 /* handle inbound data */
3313 if (FD_ISSET(tls_out.active.sock, &rfds))
3314 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3315 {
3316 fd_bits &= ~1;
3317 FD_CLR(tls_out.active.sock, &rfds);
3318 shutdown(pfd[0], SHUT_WR);
3319 timeout = 5;
3320 }
3321 else
3322 {
3323 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3324 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3325 }
3326 else if (fd_bits & 1)
3327 FD_SET(tls_out.active.sock, &rfds);
3328
3329 /* handle outbound data */
3330 if (FD_ISSET(pfd[0], &rfds))
3331 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3332 {
3333 fd_bits = 0;
3334 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3335 ct_ctx = NULL;
3336 }
3337 else
3338 {
3339 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3340 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3341 goto done;
3342 }
3343 else if (fd_bits & 2)
3344 FD_SET(pfd[0], &rfds);
3345 }
3346
3347 done:
3348 testharness_pause_ms(100); /* let logging complete */
3349 exim_exit(0, US"TLS proxy");
3350 }
3351 #endif
3352
3353
3354 /*************************************************
3355 * Deliver address list to given host *
3356 *************************************************/
3357
3358 /* If continue_hostname is not null, we get here only when continuing to
3359 deliver down an existing channel. The channel was passed as the standard
3360 input. TLS is never active on a passed channel; the previous process always
3361 closes it down before passing the connection on.
3362
3363 Otherwise, we have to make a connection to the remote host, and do the
3364 initial protocol exchange.
3365
3366 When running as an MUA wrapper, if the sender or any recipient is rejected,
3367 temporarily or permanently, we force failure for all recipients.
3368
3369 Arguments:
3370 addrlist chain of potential addresses to deliver; only those whose
3371 transport_return field is set to PENDING_DEFER are currently
3372 being processed; others should be skipped - they have either
3373 been delivered to an earlier host or IP address, or been
3374 failed by one of them.
3375 host host to deliver to
3376 host_af AF_INET or AF_INET6
3377 defport default TCP/IP port to use if host does not specify, in host
3378 byte order
3379 interface interface to bind to, or NULL
3380 tblock transport instance block
3381 message_defer set TRUE if yield is OK, but all addresses were deferred
3382 because of a non-recipient, non-host failure, that is, a
3383 4xx response to MAIL FROM, DATA, or ".". This is a defer
3384 that is specific to the message.
3385 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3386 a second attempt after TLS initialization fails
3387
3388 Returns: OK - the connection was made and the delivery attempted;
3389 the result for each address is in its data block.
3390 DEFER - the connection could not be made, or something failed
3391 while setting up the SMTP session, or there was a
3392 non-message-specific error, such as a timeout.
3393 ERROR - a filter command is specified for this transport,
3394 and there was a problem setting it up; OR helo_data
3395 or add_headers or authenticated_sender is specified
3396 for this transport, and the string failed to expand
3397 */
3398
3399 static int
3400 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3401 uschar *interface, transport_instance *tblock,
3402 BOOL *message_defer, BOOL suppress_tls)
3403 {
3404 smtp_transport_options_block * ob = SOB tblock->options_block;
3405 int yield = OK;
3406 int save_errno;
3407 int rc;
3408 struct timeval start_delivery_time;
3409
3410 BOOL pass_message = FALSE;
3411 uschar *message = NULL;
3412 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3413
3414 smtp_context sx;
3415
3416 gettimeofday(&start_delivery_time, NULL);
3417 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3418 *message_defer = FALSE;
3419
3420 sx.addrlist = addrlist;
3421 sx.conn_args.host = host;
3422 sx.conn_args.host_af = host_af,
3423 sx.port = defport;
3424 sx.conn_args.interface = interface;
3425 sx.helo_data = NULL;
3426 sx.conn_args.tblock = tblock;
3427 sx.verify = FALSE;
3428 sx.sync_addr = sx.first_addr = addrlist;
3429
3430 /* Get the channel set up ready for a message (MAIL FROM being the next
3431 SMTP command to send */
3432
3433 if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
3434 return rc;
3435
3436 /* If there is a filter command specified for this transport, we can now
3437 set it up. This cannot be done until the identify of the host is known. */
3438
3439 if (tblock->filter_command)
3440 {
3441 transport_filter_timeout = tblock->filter_timeout;
3442
3443 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3444 yield ERROR. */
3445
3446 if (!transport_set_up_command(&transport_filter_argv,
3447 tblock->filter_command, TRUE, DEFER, addrlist,
3448 string_sprintf("%.50s transport", tblock->name), NULL))
3449 {
3450 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3451 FALSE);
3452 yield = ERROR;
3453 goto SEND_QUIT;
3454 }
3455
3456 if ( transport_filter_argv
3457 && *transport_filter_argv
3458 && **transport_filter_argv
3459 && sx.peer_offered & OPTION_CHUNKING
3460 )
3461 {
3462 sx.peer_offered &= ~OPTION_CHUNKING;
3463 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3464 }
3465 }
3466
3467 /* For messages that have more than the maximum number of envelope recipients,
3468 we want to send several transactions down the same SMTP connection. (See
3469 comments in deliver.c as to how this reconciles, heuristically, with
3470 remote_max_parallel.) This optimization was added to Exim after the following
3471 code was already working. The simplest way to put it in without disturbing the
3472 code was to use a goto to jump back to this point when there is another
3473 transaction to handle. */
3474
3475 SEND_MESSAGE:
3476 sx.from_addr = return_path;
3477 sx.sync_addr = sx.first_addr;
3478 sx.ok = FALSE;
3479 sx.send_rset = TRUE;
3480 sx.completed_addr = FALSE;
3481
3482
3483 /* If we are a continued-connection-after-verify the MAIL and RCPT
3484 commands were already sent; do not re-send but do mark the addrs as
3485 having been accepted up to RCPT stage. A traditional cont-conn
3486 always has a sequence number greater than one. */
3487
3488 if (continue_hostname && continue_sequence == 1)
3489 {
3490 sx.peer_offered = smtp_peer_options;
3491 sx.pending_MAIL = FALSE;
3492 sx.ok = TRUE;
3493 sx.next_addr = NULL;
3494
3495 for (address_item * addr = addrlist; addr; addr = addr->next)
3496 addr->transport_return = PENDING_OK;
3497 }
3498 else
3499 {
3500 /* Initiate a message transfer. */
3501
3502 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
3503 {
3504 case 0: break;
3505 case -1: case -2: goto RESPONSE_FAILED;
3506 case -3: goto END_OFF;
3507 case -4: goto SEND_QUIT;
3508 default: goto SEND_FAILED;
3509 }
3510
3511 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3512 permanently or temporarily. We should have flushed and synced after the last
3513 RCPT. */
3514
3515 if (mua_wrapper)
3516 {
3517 address_item * a;
3518 unsigned cnt;
3519
3520 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
3521 if (a->transport_return != PENDING_OK)
3522 {
3523 /*XXX could we find a better errno than 0 here? */
3524 set_errno_nohost(addrlist, 0, a->message, FAIL,
3525 testflag(a, af_pass_message));
3526 sx.ok = FALSE;
3527 break;
3528 }
3529 }
3530 }
3531
3532 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3533 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3534 have a good recipient buffered up if we are pipelining. We don't want to waste
3535 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3536 are pipelining. The responses are all handled by sync_responses().
3537 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3538 to send is. */
3539
3540 if ( !(sx.peer_offered & OPTION_CHUNKING)
3541 && (sx.ok || (pipelining_active && !mua_wrapper)))
3542 {
3543 int count = smtp_write_command(&sx, SCMD_FLUSH, "DATA\r\n");
3544
3545 if (count < 0) goto SEND_FAILED;
3546 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
3547 {
3548 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3549 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3550 break;
3551
3552 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3553 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3554 case 0: break; /* No 2xx or 5xx, but no probs */
3555
3556 case -1: goto END_OFF; /* Timeout on RCPT */
3557
3558 #ifdef SUPPORT_PIPE_CONNECT
3559 case -5: /* TLS first-read error */
3560 case -4: HDEBUG(D_transport)
3561 debug_printf("failed reaping pipelined cmd responses\n");
3562 #endif
3563 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3564 }
3565 pipelining_active = FALSE;
3566 data_command = string_copy(big_buffer); /* Save for later error message */
3567 }
3568
3569 /* If there were no good recipients (but otherwise there have been no
3570 problems), just set ok TRUE, since we have handled address-specific errors
3571 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3572 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3573 well as body. Set the appropriate timeout value to be used for each chunk.
3574 (Haven't been able to make it work using select() for writing yet.) */
3575
3576 if ( !sx.ok
3577 && (!(sx.peer_offered & OPTION_CHUNKING) || !pipelining_active))
3578 {
3579 /* Save the first address of the next batch. */
3580 sx.first_addr = sx.next_addr;
3581
3582 sx.ok = TRUE;
3583 }
3584 else
3585 {
3586 transport_ctx tctx = {
3587 .u = {.fd = sx.cctx.sock}, /*XXX will this need TLS info? */
3588 .tblock = tblock,
3589 .addr = addrlist,
3590 .check_string = US".",
3591 .escape_string = US"..", /* Escaping strings */
3592 .options =
3593 topt_use_crlf | topt_escape_headers
3594 | (tblock->body_only ? topt_no_headers : 0)
3595 | (tblock->headers_only ? topt_no_body : 0)
3596 | (tblock->return_path_add ? topt_add_return_path : 0)
3597 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3598 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3599 };
3600
3601 /* If using CHUNKING we need a callback from the generic transport
3602 support to us, for the sending of BDAT smtp commands and the reaping
3603 of responses. The callback needs a whole bunch of state so set up
3604 a transport-context structure to be passed around. */
3605
3606 if (sx.peer_offered & OPTION_CHUNKING)
3607 {
3608 tctx.check_string = tctx.escape_string = NULL;
3609 tctx.options |= topt_use_bdat;
3610 tctx.chunk_cb = smtp_chunk_cmd_callback;
3611 sx.pending_BDAT = FALSE;
3612 sx.good_RCPT = sx.ok;
3613 sx.cmd_count = 0;
3614 tctx.smtp_context = &sx;
3615 }
3616 else
3617 tctx.options |= topt_end_dot;
3618
3619 /* Save the first address of the next batch. */
3620 sx.first_addr = sx.next_addr;
3621
3622 /* Responses from CHUNKING commands go in buffer. Otherwise,
3623 there has not been a response. */
3624
3625 sx.buffer[0] = 0;
3626
3627 sigalrm_seen = FALSE;
3628 transport_write_timeout = ob->data_timeout;
3629 smtp_command = US"sending data block"; /* For error messages */
3630 DEBUG(D_transport|D_v)
3631 if (sx.peer_offered & OPTION_CHUNKING)
3632 debug_printf(" will write message using CHUNKING\n");
3633 else
3634 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3635 transport_count = 0;
3636
3637 #ifndef DISABLE_DKIM
3638 {
3639 # ifdef MEASURE_TIMING
3640 struct timeval t0;
3641 gettimeofday(&t0, NULL);
3642 # endif
3643 dkim_exim_sign_init();
3644 # ifdef EXPERIMENTAL_ARC
3645 {
3646 uschar * s = ob->arc_sign;
3647 if (s)
3648 {
3649 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3650 {
3651 if (!f.expand_string_forcedfail)
3652 {
3653 message = US"failed to expand arc_sign";
3654 sx.ok = FALSE;
3655 goto SEND_FAILED;
3656 }
3657 }
3658 else if (*s)
3659 {
3660 /* Ask dkim code to hash the body for ARC */
3661 (void) arc_ams_setup_sign_bodyhash();
3662 ob->dkim.force_bodyhash = TRUE;
3663 }
3664 }
3665 }
3666 # endif
3667 # ifdef MEASURE_TIMING
3668 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3669 # endif
3670 }
3671 sx.ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3672 #else
3673 sx.ok = transport_write_message(&tctx, 0);
3674 #endif
3675
3676 /* transport_write_message() uses write() because it is called from other
3677 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3678 it can exit with "Broken pipe" as its error. This really means that the
3679 socket got closed at the far end. */
3680
3681 transport_write_timeout = 0; /* for subsequent transports */
3682
3683 /* Failure can either be some kind of I/O disaster (including timeout),
3684 or the failure of a transport filter or the expansion of added headers.
3685 Or, when CHUNKING, it can be a protocol-detected failure. */
3686
3687 if (!sx.ok)
3688 if (message) goto SEND_FAILED;
3689 else goto RESPONSE_FAILED;
3690
3691 /* We used to send the terminating "." explicitly here, but because of
3692 buffering effects at both ends of TCP/IP connections, you don't gain
3693 anything by keeping it separate, so it might as well go in the final
3694 data buffer for efficiency. This is now done by setting the topt_end_dot
3695 flag above. */
3696
3697 smtp_command = US"end of data";
3698
3699 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
3700 {
3701 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3702 switch(sync_responses(&sx, sx.cmd_count-1, 0))
3703 {
3704 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
3705 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
3706 break;
3707
3708 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3709 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
3710 case 0: break; /* No 2xx or 5xx, but no probs */
3711
3712 case -1: goto END_OFF; /* Timeout on RCPT */
3713
3714 #ifdef SUPPORT_PIPE_CONNECT
3715 case -5: /* TLS first-read error */
3716 case -4: HDEBUG(D_transport)
3717 debug_printf("failed reaping pipelined cmd responses\n");
3718 #endif
3719 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3720 }
3721 }
3722
3723 #ifndef DISABLE_PRDR
3724 /* For PRDR we optionally get a partial-responses warning followed by the
3725 individual responses, before going on with the overall response. If we don't
3726 get the warning then deal with per non-PRDR. */
3727
3728 if(sx.prdr_active)
3729 {
3730 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '3', ob->final_timeout);
3731 if (!sx.ok && errno == 0) switch(sx.buffer[0])
3732 {
3733 case '2': sx.prdr_active = FALSE;
3734 sx.ok = TRUE;
3735 break;
3736 case '4': errno = ERRNO_DATA4XX;
3737 addrlist->more_errno |=
3738 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3739 break;
3740 }
3741 }
3742 else
3743 #endif
3744
3745 /* For non-PRDR SMTP, we now read a single response that applies to the
3746 whole message. If it is OK, then all the addresses have been delivered. */
3747
3748 if (!sx.lmtp)
3749 {
3750 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3751 ob->final_timeout);
3752 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
3753 {
3754 errno = ERRNO_DATA4XX;
3755 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3756 }
3757 }
3758
3759 /* For LMTP, we get back a response for every RCPT command that we sent;
3760 some may be accepted and some rejected. For those that get a response, their
3761 status is fixed; any that are accepted have been handed over, even if later
3762 responses crash - at least, that's how I read RFC 2033.
3763
3764 If all went well, mark the recipient addresses as completed, record which
3765 host/IPaddress they were delivered to, and cut out RSET when sending another
3766 message down the same channel. Write the completed addresses to the journal
3767 now so that they are recorded in case there is a crash of hardware or
3768 software before the spool gets updated. Also record the final SMTP
3769 confirmation if needed (for SMTP only). */
3770
3771 if (sx.ok)
3772 {
3773 int flag = '=';
3774 struct timeval delivery_time;
3775 int len;
3776 uschar * conf = NULL;
3777
3778 timesince(&delivery_time, &start_delivery_time);
3779 sx.send_rset = FALSE;
3780 pipelining_active = FALSE;
3781
3782 /* Set up confirmation if needed - applies only to SMTP */
3783
3784 if (
3785 #ifdef DISABLE_EVENT
3786 LOGGING(smtp_confirmation) &&
3787 #endif
3788 !sx.lmtp
3789 )
3790 {
3791 const uschar *s = string_printing(sx.buffer);
3792 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3793 conf = (s == sx.buffer)? US string_copy(s) : US s;
3794 }
3795
3796 /* Process all transported addresses - for LMTP or PRDR, read a status for
3797 each one. */
3798
3799 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3800 {
3801 if (addr->transport_return != PENDING_OK) continue;
3802
3803 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3804 remaining addresses. Otherwise, it's a return code for just the one
3805 address. For temporary errors, add a retry item for the address so that
3806 it doesn't get tried again too soon. */
3807
3808 #ifndef DISABLE_PRDR
3809 if (sx.lmtp || sx.prdr_active)
3810 #else
3811 if (sx.lmtp)
3812 #endif
3813 {
3814 if (!smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3815 ob->final_timeout))
3816 {
3817 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
3818 addr->message = string_sprintf(
3819 #ifndef DISABLE_PRDR
3820 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
3821 #else
3822 "LMTP error after %s: %s",
3823 #endif
3824 data_command, string_printing(sx.buffer));
3825 setflag(addr, af_pass_message); /* Allow message to go to user */
3826 if (sx.buffer[0] == '5')
3827 addr->transport_return = FAIL;
3828 else
3829 {
3830 errno = ERRNO_DATA4XX;
3831 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3832 addr->transport_return = DEFER;
3833 #ifndef DISABLE_PRDR
3834 if (!sx.prdr_active)
3835 #endif
3836 retry_add_item(addr, addr->address_retry_key, 0);
3837 }
3838 continue;
3839 }
3840 sx.completed_addr = TRUE; /* NOW we can set this flag */
3841 if (LOGGING(smtp_confirmation))
3842 {
3843 const uschar *s = string_printing(sx.buffer);
3844 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3845 conf = (s == sx.buffer) ? US string_copy(s) : US s;
3846 }
3847 }
3848
3849 /* SMTP, or success return from LMTP for this address. Pass back the
3850 actual host that was used. */
3851
3852 addr->transport_return = OK;
3853 addr->more_errno = delivery_time.tv_sec;
3854 addr->delivery_usec = delivery_time.tv_usec;
3855 addr->host_used = host;
3856 addr->special_action = flag;
3857 addr->message = conf;
3858
3859 if (tcp_out_fastopen)
3860 {
3861 setflag(addr, af_tcp_fastopen_conn);
3862 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3863 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3864 }
3865 if (sx.pipelining_used) setflag(addr, af_pipelining);
3866 #ifdef SUPPORT_PIPE_CONNECT
3867 if (sx.early_pipe_active) setflag(addr, af_early_pipe);
3868 #endif
3869 #ifndef DISABLE_PRDR
3870 if (sx.prdr_active) setflag(addr, af_prdr_used);
3871 #endif
3872 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3873 flag = '-';
3874
3875 #ifndef DISABLE_PRDR
3876 if (!sx.prdr_active)
3877 #endif
3878 {
3879 /* Update the journal. For homonymic addresses, use the base address plus
3880 the transport name. See lots of comments in deliver.c about the reasons
3881 for the complications when homonyms are involved. Just carry on after
3882 write error, as it may prove possible to update the spool file later. */
3883
3884 if (testflag(addr, af_homonym))
3885 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3886 else
3887 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3888
3889 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
3890 len = Ustrlen(CS sx.buffer);
3891 if (write(journal_fd, sx.buffer, len) != len)
3892 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3893 "%s: %s", sx.buffer, strerror(errno));
3894 }
3895 }
3896
3897 #ifndef DISABLE_PRDR
3898 if (sx.prdr_active)
3899 {
3900 const uschar * overall_message;
3901
3902 /* PRDR - get the final, overall response. For any non-success
3903 upgrade all the address statuses. */
3904
3905 sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer), '2',
3906 ob->final_timeout);
3907 if (!sx.ok)
3908 {
3909 if(errno == 0 && sx.buffer[0] == '4')
3910 {
3911 errno = ERRNO_DATA4XX;
3912 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
3913 }
3914 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3915 if (sx.buffer[0] == '5' || addr->transport_return == OK)
3916 addr->transport_return = PENDING_OK; /* allow set_errno action */
3917 goto RESPONSE_FAILED;
3918 }
3919
3920 /* Append the overall response to the individual PRDR response for logging
3921 and update the journal, or setup retry. */
3922
3923 overall_message = string_printing(sx.buffer);
3924 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3925 if (addr->transport_return == OK)
3926 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3927
3928 for (address_item * addr = addrlist; addr != sx.first_addr; addr = addr->next)
3929 if (addr->transport_return == OK)
3930 {
3931 if (testflag(addr, af_homonym))
3932 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3933 else
3934 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3935
3936 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3937 len = Ustrlen(CS sx.buffer);
3938 if (write(journal_fd, sx.buffer, len) != len)
3939 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3940 "%s: %s", sx.buffer, strerror(errno));
3941 }
3942 else if (addr->transport_return == DEFER)
3943 retry_add_item(addr, addr->address_retry_key, -2);
3944 }
3945 #endif
3946
3947 /* Ensure the journal file is pushed out to disk. */
3948
3949 if (EXIMfsync(journal_fd) < 0)
3950 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3951 strerror(errno));
3952 }
3953 }
3954
3955
3956 /* Handle general (not specific to one address) failures here. The value of ok
3957 is used to skip over this code on the falling through case. A timeout causes a
3958 deferral. Other errors may defer or fail according to the response code, and
3959 may set up a special errno value, e.g. after connection chopped, which is
3960 assumed if errno == 0 and there is no text in the buffer. If control reaches
3961 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3962 the problem is not related to this specific message. */
3963
3964 if (!sx.ok)
3965 {
3966 int code, set_rc;
3967 uschar * set_message;
3968
3969 RESPONSE_FAILED:
3970 {
3971 save_errno = errno;
3972 message = NULL;
3973 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3974 sx.buffer, &code, &message, &pass_message);
3975 goto FAILED;
3976 }
3977
3978 SEND_FAILED:
3979 {
3980 save_errno = errno;
3981 code = '4';
3982 message = string_sprintf("send() to %s [%s] failed: %s",
3983 host->name, host->address, message ? message : US strerror(save_errno));
3984 sx.send_quit = FALSE;
3985 goto FAILED;
3986 }
3987
3988 FAILED:
3989 {
3990 BOOL message_error;
3991
3992 sx.ok = FALSE; /* For when reached by GOTO */
3993 set_message = message;
3994
3995 /* We want to handle timeouts after MAIL or "." and loss of connection after
3996 "." specially. They can indicate a problem with the sender address or with
3997 the contents of the message rather than a real error on the connection. These
3998 cases are treated in the same way as a 4xx response. This next bit of code
3999 does the classification. */
4000
4001 switch(save_errno)
4002 {
4003 case 0:
4004 case ERRNO_MAIL4XX:
4005 case ERRNO_DATA4XX:
4006 message_error = TRUE;
4007 break;
4008
4009 case ETIMEDOUT:
4010 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4011 Ustrncmp(smtp_command,"end ",4) == 0;
4012 break;
4013
4014 case ERRNO_SMTPCLOSED:
4015 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4016 break;
4017
4018 default:
4019 message_error = FALSE;
4020 break;
4021 }
4022
4023 /* Handle the cases that are treated as message errors. These are:
4024
4025 (a) negative response or timeout after MAIL
4026 (b) negative response after DATA
4027 (c) negative response or timeout or dropped connection after "."
4028 (d) utf8 support required and not offered
4029
4030 It won't be a negative response or timeout after RCPT, as that is dealt
4031 with separately above. The action in all cases is to set an appropriate
4032 error code for all the addresses, but to leave yield set to OK because the
4033 host itself has not failed. Of course, it might in practice have failed
4034 when we've had a timeout, but if so, we'll discover that at the next
4035 delivery attempt. For a temporary error, set the message_defer flag, and
4036 write to the logs for information if this is not the last host. The error
4037 for the last host will be logged as part of the address's log line. */
4038
4039 if (message_error)
4040 {
4041 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4042
4043 /* If there's an errno, the message contains just the identity of
4044 the host. */
4045
4046 if (code == '5')
4047 set_rc = FAIL;
4048 else /* Anything other than 5 is treated as temporary */
4049 {
4050 set_rc = DEFER;
4051 if (save_errno > 0)
4052 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4053
4054 write_logs(host, message, sx.first_addr ? sx.first_addr->basic_errno : 0);
4055
4056 *message_defer = TRUE;
4057 }
4058 }
4059
4060 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4061 ".", or some other transportation error. We defer all addresses and yield
4062 DEFER, except for the case of failed add_headers expansion, or a transport
4063 filter failure, when the yield should be ERROR, to stop it trying other
4064 hosts. */
4065
4066 else
4067 {
4068 #ifdef SUPPORT_PIPE_CONNECT
4069 /* If we were early-pipelinng and the actual EHLO response did not match
4070 the cached value we assumed, we could have detected it and passed a
4071 custom errno through to here. It would be nice to RSET and retry right
4072 away, but to reliably do that we eould need an extra synch point before
4073 we committed to data and that would discard half the gained roundrips.
4074 Or we could summarily drop the TCP connection. but that is also ugly.
4075 Instead, we ignore the possibility (having freshened the cache) and rely
4076 on the server telling us with a nonmessage error if we have tried to
4077 do something it no longer supports. */
4078 #endif
4079 set_rc = DEFER;
4080 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4081 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4082 }
4083 }
4084
4085 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
4086 #ifdef EXPERIMENTAL_DSN_INFO
4087 , sx.smtp_greeting, sx.helo_response
4088 #endif
4089 );
4090 }
4091
4092
4093 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4094 SMTP session tidily. However, if there were too many addresses to send in one
4095 message (indicated by first_addr being non-NULL) we want to carry on with the
4096 rest of them. Also, it is desirable to send more than one message down the SMTP
4097 connection if there are several waiting, provided we haven't already sent so
4098 many as to hit the configured limit. The function transport_check_waiting looks
4099 for a waiting message and returns its id. Then transport_pass_socket tries to
4100 set up a continued delivery by passing the socket on to another process. The
4101 variable send_rset is FALSE if a message has just been successfully transferred.
4102
4103 If we are already sending down a continued channel, there may be further
4104 addresses not yet delivered that are aimed at the same host, but which have not
4105 been passed in this run of the transport. In this case, continue_more will be
4106 true, and all we should do is send RSET if necessary, and return, leaving the
4107 channel open.
4108
4109 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4110 do not want to continue with other messages down the same channel, because that
4111 can lead to looping between two or more messages, all with the same,
4112 temporarily failing address(es). [The retry information isn't updated yet, so
4113 new processes keep on trying.] We probably also don't want to try more of this
4114 message's addresses either.
4115
4116 If we have started a TLS session, we have to end it before passing the
4117 connection to a new process. However, not all servers can handle this (Exim
4118 can), so we do not pass such a connection on if the host matches
4119 hosts_nopass_tls. */
4120
4121 DEBUG(D_transport)
4122 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4123 "yield=%d first_address is %sNULL\n", sx.ok, sx.send_quit,
4124 sx.send_rset, f.continue_more, yield, sx.first_addr ? "not " : "");
4125
4126 if (sx.completed_addr && sx.ok && sx.send_quit)
4127 {
4128 BOOL more;
4129 smtp_compare_t t_compare;
4130
4131 t_compare.tblock = tblock;
4132 t_compare.current_sender_address = sender_address;
4133
4134 if ( sx.first_addr != NULL
4135 || f.continue_more
4136 || (
4137 #ifndef DISABLE_TLS
4138 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4139 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4140 )
4141 &&
4142 #endif
4143 transport_check_waiting(tblock->name, host->name,
4144 tblock->connection_max_messages, new_message_id, &more,
4145 (oicf)smtp_are_same_identities, (void*)&t_compare)
4146 ) )
4147 {
4148 uschar *msg;
4149 BOOL pass_message;
4150
4151 if (sx.send_rset)
4152 if (! (sx.ok = smtp_write_command(&sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4153 {
4154 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4155 host->address, strerror(errno));
4156 sx.send_quit = FALSE;
4157 }
4158 else if (! (sx.ok = smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4159 '2', ob->command_timeout)))
4160 {
4161 int code;
4162 sx.send_quit = check_response(host, &errno, 0, sx.buffer, &code, &msg,
4163 &pass_message);
4164 if (!sx.send_quit)
4165 {
4166 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4167 host->name, host->address, msg);
4168 }
4169 }
4170
4171 /* Either RSET was not needed, or it succeeded */
4172
4173 if (sx.ok)
4174 {
4175 #ifndef DISABLE_TLS
4176 int pfd[2];
4177 #endif
4178 int socket_fd = sx.cctx.sock;
4179
4180
4181 if (sx.first_addr != NULL) /* More addresses still to be sent */
4182 { /* in this run of the transport */
4183 continue_sequence++; /* Causes * in logging */
4184 goto SEND_MESSAGE;
4185 }
4186
4187 /* Unless caller said it already has more messages listed for this host,
4188 pass the connection on to a new Exim process (below, the call to
4189 transport_pass_socket). If the caller has more ready, just return with
4190 the connection still open. */
4191
4192 #ifndef DISABLE_TLS
4193 if (tls_out.active.sock >= 0)
4194 if ( f.continue_more
4195 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4196 {
4197 /* Before passing the socket on, or returning to caller with it still
4198 open, we must shut down TLS. Not all MTAs allow for the continuation
4199 of the SMTP session when TLS is shut down. We test for this by sending
4200 a new EHLO. If we don't get a good response, we don't attempt to pass
4201 the socket on. */
4202
4203 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4204 sx.cctx.tls_ctx = NULL;
4205 smtp_peer_options = smtp_peer_options_wrap;
4206 sx.ok = !sx.smtps
4207 && smtp_write_command(&sx, SCMD_FLUSH, "EHLO %s\r\n", sx.helo_data)
4208 >= 0
4209 && smtp_read_response(&sx, sx.buffer, sizeof(sx.buffer),
4210 '2', ob->command_timeout);
4211
4212 if (sx.ok && f.continue_more)
4213 return yield; /* More addresses for another run */
4214 }
4215 else
4216 {
4217 /* Set up a pipe for proxying TLS for the new transport process */
4218
4219 smtp_peer_options |= OPTION_TLS;
4220 if ((sx.ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4221 socket_fd = pfd[1];
4222 else
4223 set_errno(sx.first_addr, errno, US"internal allocation problem",
4224 DEFER, FALSE, host
4225 # ifdef EXPERIMENTAL_DSN_INFO
4226 , sx.smtp_greeting, sx.helo_response
4227 # endif
4228 );
4229 }
4230 else
4231 #endif
4232 if (f.continue_more)
4233 return yield; /* More addresses for another run */
4234
4235 /* If the socket is successfully passed, we mustn't send QUIT (or
4236 indeed anything!) from here. */
4237
4238 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4239 propagate it from the initial
4240 */
4241 if (sx.ok && transport_pass_socket(tblock->name, host->name,
4242 host->address, new_message_id, socket_fd))
4243 {
4244 sx.send_quit = FALSE;
4245
4246 /* We have passed the client socket to a fresh transport process.
4247 If TLS is still active, we need to proxy it for the transport we
4248 just passed the baton to. Fork a child to to do it, and return to
4249 get logging done asap. Which way to place the work makes assumptions
4250 about post-fork prioritisation which may not hold on all platforms. */
4251 #ifndef DISABLE_TLS
4252 if (tls_out.active.sock >= 0)
4253 {
4254 int pid = fork();
4255 if (pid == 0) /* child; fork again to disconnect totally */
4256 {
4257 testharness_pause_ms(100); /* let parent debug out */
4258 /* does not return */
4259 smtp_proxy_tls(sx.cctx.tls_ctx, sx.buffer, sizeof(sx.buffer), pfd,
4260 ob->command_timeout);
4261 }
4262
4263 if (pid > 0) /* parent */
4264 {
4265 DEBUG(D_transport) debug_printf("proxy-proc inter-pid %d\n", pid);
4266 close(pfd[0]);
4267 /* tidy the inter-proc to disconn the proxy proc */
4268 waitpid(pid, NULL, 0);
4269 tls_close(sx.cctx.tls_ctx, TLS_NO_SHUTDOWN);
4270 sx.cctx.tls_ctx = NULL;
4271 (void)close(sx.cctx.sock);
4272 sx.cctx.sock = -1;
4273 continue_transport = NULL;
4274 continue_hostname = NULL;
4275 return yield;
4276 }
4277 log_write(0, LOG_PANIC_DIE, "fork failed");
4278 }
4279 #endif
4280 }
4281 }
4282
4283 /* If RSET failed and there are addresses left, they get deferred. */
4284 else
4285 set_errno(sx.first_addr, errno, msg, DEFER, FALSE, host
4286 #ifdef EXPERIMENTAL_DSN_INFO
4287 , sx.smtp_greeting, sx.helo_response
4288 #endif
4289 );
4290 }
4291 }
4292
4293 /* End off tidily with QUIT unless the connection has died or the socket has
4294 been passed to another process. There has been discussion on the net about what
4295 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4296 to wait for a response, but on the other hand, there isn't anything one can do
4297 with an error response, other than log it. Exim used to do that. However,
4298 further discussion suggested that it is positively advantageous not to wait for
4299 the response, but to close the session immediately. This is supposed to move
4300 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4301 load from the server. (Hosts that are both servers and clients may not see much
4302 difference, of course.) Further discussion indicated that this was safe to do
4303 on Unix systems which have decent implementations of TCP/IP that leave the
4304 connection around for a while (TIME_WAIT) after the application has gone away.
4305 This enables the response sent by the server to be properly ACKed rather than
4306 timed out, as can happen on broken TCP/IP implementations on other OS.
4307
4308 This change is being made on 31-Jul-98. After over a year of trouble-free
4309 operation, the old commented-out code was removed on 17-Sep-99. */
4310
4311 SEND_QUIT:
4312 #ifdef TCP_CORK
4313 (void) setsockopt(sx.cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4314 #endif
4315 if (sx.send_quit) (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4316
4317 END_OFF:
4318
4319 #ifndef DISABLE_TLS
4320 tls_close(sx.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4321 sx.cctx.tls_ctx = NULL;
4322 #endif
4323
4324 /* Close the socket, and return the appropriate value, first setting
4325 works because the NULL setting is passed back to the calling process, and
4326 remote_max_parallel is forced to 1 when delivering over an existing connection,
4327
4328 If all went well and continue_more is set, we shouldn't actually get here if
4329 there are further addresses, as the return above will be taken. However,
4330 writing RSET might have failed, or there may be other addresses whose hosts are
4331 specified in the transports, and therefore not visible at top level, in which
4332 case continue_more won't get set. */
4333
4334 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4335 if (sx.send_quit)
4336 {
4337 shutdown(sx.cctx.sock, SHUT_WR);
4338 millisleep(20);
4339 testharness_pause_ms(200);
4340 if (fcntl(sx.cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4341 for (int i = 16; read(sx.cctx.sock, sx.inbuffer, sizeof(sx.inbuffer)) > 0 && i > 0;)
4342 i--; /* drain socket */
4343 }
4344 (void)close(sx.cctx.sock);
4345
4346 #ifndef DISABLE_EVENT
4347 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4348 #endif
4349
4350 continue_transport = NULL;
4351 continue_hostname = NULL;
4352 return yield;
4353 }
4354
4355
4356
4357
4358 /*************************************************
4359 * Closedown entry point *
4360 *************************************************/
4361
4362 /* This function is called when exim is passed an open smtp channel
4363 from another incarnation, but the message which it has been asked
4364 to deliver no longer exists. The channel is on stdin.
4365
4366 We might do fancy things like looking for another message to send down
4367 the channel, but if the one we sought has gone, it has probably been
4368 delivered by some other process that itself will seek further messages,
4369 so just close down our connection.
4370
4371 Argument: pointer to the transport instance block
4372 Returns: nothing
4373 */
4374
4375 void
4376 smtp_transport_closedown(transport_instance *tblock)
4377 {
4378 smtp_transport_options_block * ob = SOB tblock->options_block;
4379 client_conn_ctx cctx;
4380 smtp_context sx;
4381 uschar buffer[256];
4382 uschar inbuffer[4096];
4383 uschar outbuffer[16];
4384
4385 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4386 cctx.sock = fileno(stdin);
4387 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4388
4389 sx.inblock.cctx = &cctx;
4390 sx.inblock.buffer = inbuffer;
4391 sx.inblock.buffersize = sizeof(inbuffer);
4392 sx.inblock.ptr = inbuffer;
4393 sx.inblock.ptrend = inbuffer;
4394
4395 sx.outblock.cctx = &cctx;
4396 sx.outblock.buffersize = sizeof(outbuffer);
4397 sx.outblock.buffer = outbuffer;
4398 sx.outblock.ptr = outbuffer;
4399 sx.outblock.cmd_count = 0;
4400 sx.outblock.authenticating = FALSE;
4401
4402 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4403 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4404 (void)close(cctx.sock);
4405 }
4406
4407
4408
4409 /*************************************************
4410 * Prepare addresses for delivery *
4411 *************************************************/
4412
4413 /* This function is called to flush out error settings from previous delivery
4414 attempts to other hosts. It also records whether we got here via an MX record
4415 or not in the more_errno field of the address. We are interested only in
4416 addresses that are still marked DEFER - others may have got delivered to a
4417 previously considered IP address. Set their status to PENDING_DEFER to indicate
4418 which ones are relevant this time.
4419
4420 Arguments:
4421 addrlist the list of addresses
4422 host the host we are delivering to
4423
4424 Returns: the first address for this delivery
4425 */
4426
4427 static address_item *
4428 prepare_addresses(address_item *addrlist, host_item *host)
4429 {
4430 address_item *first_addr = NULL;
4431 for (address_item * addr = addrlist; addr; addr = addr->next)
4432 if (addr->transport_return == DEFER)
4433 {
4434 if (!first_addr) first_addr = addr;
4435 addr->transport_return = PENDING_DEFER;
4436 addr->basic_errno = 0;
4437 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4438 addr->message = NULL;
4439 #ifndef DISABLE_TLS
4440 addr->cipher = NULL;
4441 addr->ourcert = NULL;
4442 addr->peercert = NULL;
4443 addr->peerdn = NULL;
4444 addr->ocsp = OCSP_NOT_REQ;
4445 addr->tlsver = NULL;
4446 #endif
4447 #ifdef EXPERIMENTAL_DSN_INFO
4448 addr->smtp_greeting = NULL;
4449 addr->helo_response = NULL;
4450 #endif
4451 }
4452 return first_addr;
4453 }
4454
4455
4456
4457 /*************************************************
4458 * Main entry point *
4459 *************************************************/
4460
4461 /* See local README for interface details. As this is a remote transport, it is
4462 given a chain of addresses to be delivered in one connection, if possible. It
4463 always returns TRUE, indicating that each address has its own independent
4464 status set, except if there is a setting up problem, in which case it returns
4465 FALSE. */
4466
4467 BOOL
4468 smtp_transport_entry(
4469 transport_instance *tblock, /* data for this instantiation */
4470 address_item *addrlist) /* addresses we are working on */
4471 {
4472 int defport;
4473 int hosts_defer = 0;
4474 int hosts_fail = 0;
4475 int hosts_looked_up = 0;
4476 int hosts_retry = 0;
4477 int hosts_serial = 0;
4478 int hosts_total = 0;
4479 int total_hosts_tried = 0;
4480 BOOL expired = TRUE;
4481 uschar *expanded_hosts = NULL;
4482 uschar *pistring;
4483 uschar *tid = string_sprintf("%s transport", tblock->name);
4484 smtp_transport_options_block *ob = SOB tblock->options_block;
4485 host_item *hostlist = addrlist->host_list;
4486 host_item *host = NULL;
4487
4488 DEBUG(D_transport)
4489 {
4490 debug_printf("%s transport entered\n", tblock->name);
4491 for (address_item * addr = addrlist; addr; addr = addr->next)
4492 debug_printf(" %s\n", addr->address);
4493 if (hostlist)
4494 {
4495 debug_printf("hostlist:\n");
4496 for (host_item * host = hostlist; host; host = host->next)
4497 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4498 }
4499 if (continue_hostname)
4500 debug_printf("already connected to %s [%s] (on fd %d)\n",
4501 continue_hostname, continue_host_address,
4502 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4503 }
4504
4505 /* Set the flag requesting that these hosts be added to the waiting
4506 database if the delivery fails temporarily or if we are running with
4507 queue_smtp or a 2-stage queue run. This gets unset for certain
4508 kinds of error, typically those that are specific to the message. */
4509
4510 update_waiting = TRUE;
4511
4512 /* If a host list is not defined for the addresses - they must all have the
4513 same one in order to be passed to a single transport - or if the transport has
4514 a host list with hosts_override set, use the host list supplied with the
4515 transport. It is an error for this not to exist. */
4516
4517 if (!hostlist || (ob->hosts_override && ob->hosts))
4518 {
4519 if (!ob->hosts)
4520 {
4521 addrlist->message = string_sprintf("%s transport called with no hosts set",
4522 tblock->name);
4523 addrlist->transport_return = PANIC;
4524 return FALSE; /* Only top address has status */
4525 }
4526
4527 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4528 ob->hosts);
4529
4530 /* If the transport's host list contains no '$' characters, and we are not
4531 randomizing, it is fixed and therefore a chain of hosts can be built once
4532 and for all, and remembered for subsequent use by other calls to this
4533 transport. If, on the other hand, the host list does contain '$', or we are
4534 randomizing its order, we have to rebuild it each time. In the fixed case,
4535 as the hosts string will never be used again, it doesn't matter that we
4536 replace all the : characters with zeros. */
4537
4538 if (!ob->hostlist)
4539 {
4540 uschar *s = ob->hosts;
4541
4542 if (Ustrchr(s, '$') != NULL)
4543 {
4544 if (!(expanded_hosts = expand_string(s)))
4545 {
4546 addrlist->message = string_sprintf("failed to expand list of hosts "
4547 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4548 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4549 return FALSE; /* Only top address has status */
4550 }
4551 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4552 "\"%s\"\n", s, expanded_hosts);
4553 s = expanded_hosts;
4554 }
4555 else
4556 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4557
4558 if (is_tainted(s))
4559 {
4560 log_write(0, LOG_MAIN|LOG_PANIC,
4561 "attempt to use tainted host list '%s' from '%s' in transport %s",
4562 s, ob->hosts, tblock->name);
4563 /* Avoid leaking info to an attacker */
4564 addrlist->message = US"internal configuration error";
4565 addrlist->transport_return = PANIC;
4566 return FALSE;
4567 }
4568
4569 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4570
4571 /* Check that the expansion yielded something useful. */
4572 if (!hostlist)
4573 {
4574 addrlist->message =
4575 string_sprintf("%s transport has empty hosts setting", tblock->name);
4576 addrlist->transport_return = PANIC;
4577 return FALSE; /* Only top address has status */
4578 }
4579
4580 /* If there was no expansion of hosts, save the host list for
4581 next time. */
4582
4583 if (!expanded_hosts) ob->hostlist = hostlist;
4584 }
4585
4586 /* This is not the first time this transport has been run in this delivery;
4587 the host list was built previously. */
4588
4589 else
4590 hostlist = ob->hostlist;
4591 }
4592
4593 /* The host list was supplied with the address. If hosts_randomize is set, we
4594 must sort it into a random order if it did not come from MX records and has not
4595 already been randomized (but don't bother if continuing down an existing
4596 connection). */
4597
4598 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4599 {
4600 host_item *newlist = NULL;
4601 while (hostlist)
4602 {
4603 host_item *h = hostlist;
4604 hostlist = hostlist->next;
4605
4606 h->sort_key = random_number(100);
4607
4608 if (!newlist)
4609 {
4610 h->next = NULL;
4611 newlist = h;
4612 }
4613 else if (h->sort_key < newlist->sort_key)
4614 {
4615 h->next = newlist;
4616 newlist = h;
4617 }
4618 else
4619 {
4620 host_item *hh = newlist;
4621 while (hh->next)
4622 {
4623 if (h->sort_key < hh->next->sort_key) break;
4624 hh = hh->next;
4625 }
4626 h->next = hh->next;
4627 hh->next = h;
4628 }
4629 }
4630
4631 hostlist = addrlist->host_list = newlist;
4632 }
4633
4634 /* Sort out the default port. */
4635
4636 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4637
4638 /* For each host-plus-IP-address on the list:
4639
4640 . If this is a continued delivery and the host isn't the one with the
4641 current connection, skip.
4642
4643 . If the status is unusable (i.e. previously failed or retry checked), skip.
4644
4645 . If no IP address set, get the address, either by turning the name into
4646 an address, calling gethostbyname if gethostbyname is on, or by calling
4647 the DNS. The DNS may yield multiple addresses, in which case insert the
4648 extra ones into the list.
4649
4650 . Get the retry data if not previously obtained for this address and set the
4651 field which remembers the state of this address. Skip if the retry time is
4652 not reached. If not, remember whether retry data was found. The retry string
4653 contains both the name and the IP address.
4654
4655 . Scan the list of addresses and mark those whose status is DEFER as
4656 PENDING_DEFER. These are the only ones that will be processed in this cycle
4657 of the hosts loop.
4658
4659 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4660 Some addresses may be successfully delivered, others may fail, and yet
4661 others may get temporary errors and so get marked DEFER.
4662
4663 . The return from the delivery attempt is OK if a connection was made and a
4664 valid SMTP dialogue was completed. Otherwise it is DEFER.
4665
4666 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4667
4668 . If fail to connect, or other defer state, add a retry item.
4669
4670 . If there are any addresses whose status is still DEFER, carry on to the
4671 next host/IPaddress, unless we have tried the number of hosts given
4672 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4673 there is some fancy logic for hosts_max_try that means its limit can be
4674 overstepped in some circumstances.
4675
4676 If we get to the end of the list, all hosts have deferred at least one address,
4677 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4678 delivery attempt to those hosts whose last try was before the arrival time of
4679 the current message. To cope with this, we have to go round the loop a second
4680 time. After that, set the status and error data for any addresses that haven't
4681 had it set already. */
4682
4683 for (int cutoff_retry = 0;
4684 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4685 cutoff_retry++)
4686 {
4687 host_item *nexthost = NULL;
4688 int unexpired_hosts_tried = 0;
4689 BOOL continue_host_tried = FALSE;
4690
4691 retry_non_continued:
4692 for (host = hostlist;
4693 host
4694 && unexpired_hosts_tried < ob->hosts_max_try
4695 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4696 host = nexthost)
4697 {
4698 int rc;
4699 int host_af;
4700 BOOL host_is_expired = FALSE;
4701 BOOL message_defer = FALSE;
4702 BOOL some_deferred = FALSE;
4703 address_item *first_addr = NULL;
4704 uschar *interface = NULL;
4705 uschar *retry_host_key = NULL;
4706 uschar *retry_message_key = NULL;
4707 uschar *serialize_key = NULL;
4708
4709 /* Default next host is next host. :-) But this can vary if the
4710 hosts_max_try limit is hit (see below). It may also be reset if a host
4711 address is looked up here (in case the host was multihomed). */
4712
4713 nexthost = host->next;
4714
4715 /* If the address hasn't yet been obtained from the host name, look it up
4716 now, unless the host is already marked as unusable. If it is marked as
4717 unusable, it means that the router was unable to find its IP address (in
4718 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4719 the lookup failed last time. We don't get this far if *all* MX records
4720 point to non-existent hosts; that is treated as a hard error.
4721
4722 We can just skip this host entirely. When the hosts came from the router,
4723 the address will timeout based on the other host(s); when the address is
4724 looked up below, there is an explicit retry record added.
4725
4726 Note that we mustn't skip unusable hosts if the address is not unset; they
4727 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4728
4729 if (!host->address)
4730 {
4731 int new_port, flags;
4732
4733 if (host->status >= hstatus_unusable)
4734 {
4735 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4736 host->name);
4737 continue;
4738 }
4739
4740 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4741
4742 /* The host name is permitted to have an attached port. Find it, and
4743 strip it from the name. Just remember it for now. */
4744
4745 new_port = host_item_get_port(host);
4746
4747 /* Count hosts looked up */
4748
4749 hosts_looked_up++;
4750
4751 /* Find by name if so configured, or if it's an IP address. We don't
4752 just copy the IP address, because we need the test-for-local to happen. */
4753
4754 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4755 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4756 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4757
4758 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4759 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4760 else
4761 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4762 &ob->dnssec, /* domains for request/require */
4763 NULL, NULL);
4764
4765 /* Update the host (and any additional blocks, resulting from
4766 multihoming) with a host-specific port, if any. */
4767
4768 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4769
4770 /* Failure to find the host at this time (usually DNS temporary failure)
4771 is really a kind of routing failure rather than a transport failure.
4772 Therefore we add a retry item of the routing kind, not to stop us trying
4773 to look this name up here again, but to ensure the address gets timed
4774 out if the failures go on long enough. A complete failure at this point
4775 commonly points to a configuration error, but the best action is still
4776 to carry on for the next host. */
4777
4778 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4779 {
4780 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4781 expired = FALSE;
4782 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4783 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4784 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4785 host->status = hstatus_unusable;
4786
4787 for (address_item * addr = addrlist; addr; addr = addr->next)
4788 {
4789 if (addr->transport_return != DEFER) continue;
4790 addr->basic_errno = ERRNO_UNKNOWNHOST;
4791 addr->message = string_sprintf(
4792 rc == HOST_FIND_SECURITY
4793 ? "lookup of IP address for %s was insecure"
4794 : "failed to lookup IP address for %s",
4795 host->name);
4796 }
4797 continue;
4798 }
4799
4800 /* If the host is actually the local host, we may have a problem, or
4801 there may be some cunning configuration going on. In the problem case,
4802 log things and give up. The default transport status is already DEFER. */
4803
4804 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4805 {
4806 for (address_item * addr = addrlist; addr; addr = addr->next)
4807 {
4808 addr->basic_errno = 0;
4809 addr->message = string_sprintf("%s transport found host %s to be "
4810 "local", tblock->name, host->name);
4811 }
4812 goto END_TRANSPORT;
4813 }
4814 } /* End of block for IP address lookup */
4815
4816 /* If this is a continued delivery, we are interested only in the host
4817 which matches the name of the existing open channel. The check is put
4818 here after the local host lookup, in case the name gets expanded as a
4819 result of the lookup. Set expired FALSE, to save the outer loop executing
4820 twice. */
4821
4822 if (continue_hostname)
4823 if ( Ustrcmp(continue_hostname, host->name) != 0
4824 || Ustrcmp(continue_host_address, host->address) != 0
4825 )
4826 {
4827 expired = FALSE;
4828 continue; /* With next host */
4829 }
4830 else
4831 continue_host_tried = TRUE;
4832
4833 /* Reset the default next host in case a multihomed host whose addresses
4834 are not looked up till just above added to the host list. */
4835
4836 nexthost = host->next;
4837
4838 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4839 domain is in queue_smtp_domains, we don't actually want to attempt any
4840 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4841 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4842 were not in it. We don't want to hold up all SMTP deliveries! Except when
4843 doing a two-stage queue run, don't do this if forcing. */
4844
4845 if ((!f.deliver_force || f.queue_2stage) && (f.queue_smtp ||
4846 match_isinlist(addrlist->domain,
4847 (const uschar **)&queue_smtp_domains, 0,
4848 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
4849 {
4850 expired = FALSE;
4851 for (address_item * addr = addrlist; addr; addr = addr->next)
4852 if (addr->transport_return == DEFER)
4853 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
4854 continue; /* With next host */
4855 }
4856
4857 /* Count hosts being considered - purely for an intelligent comment
4858 if none are usable. */
4859
4860 hosts_total++;
4861
4862 /* Set $host and $host address now in case they are needed for the
4863 interface expansion or the serialize_hosts check; they remain set if an
4864 actual delivery happens. */
4865
4866 deliver_host = host->name;
4867 deliver_host_address = host->address;
4868 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4869 : host->dnssec == DS_NO ? US"no"
4870 : US"";
4871
4872 /* Set up a string for adding to the retry key if the port number is not
4873 the standard SMTP port. A host may have its own port setting that overrides
4874 the default. */
4875
4876 pistring = string_sprintf(":%d", host->port == PORT_NONE
4877 ? defport : host->port);
4878 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4879
4880 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4881 string is set, even if constant (as different transports can have different
4882 constant settings), we must add it to the key that is used for retries,
4883 because connections to the same host from a different interface should be
4884 treated separately. */
4885
4886 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4887 {
4888 uschar * s = ob->interface;
4889 if (s && *s)
4890 {
4891 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4892 return FALSE;
4893 pistring = string_sprintf("%s/%s", pistring, interface);
4894 }
4895 }
4896
4897 /* The first time round the outer loop, check the status of the host by
4898 inspecting the retry data. The second time round, we are interested only
4899 in expired hosts that haven't been tried since this message arrived. */
4900
4901 if (cutoff_retry == 0)
4902 {
4903 BOOL incl_ip;
4904 /* Ensure the status of the address is set by checking retry data if
4905 necessary. There may be host-specific retry data (applicable to all
4906 messages) and also data for retries of a specific message at this host.
4907 If either of these retry records are actually read, the keys used are
4908 returned to save recomputing them later. */
4909
4910 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4911 US"retry_include_ip_address", ob->retry_include_ip_address,
4912 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4913 continue; /* with next host */
4914
4915 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4916 incl_ip, &retry_host_key, &retry_message_key);
4917
4918 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4919 host->address ? host->address : US"", pistring,
4920 host->status == hstatus_usable ? "usable"
4921 : host->status == hstatus_unusable ? "unusable"
4922 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4923
4924 /* Skip this address if not usable at this time, noting if it wasn't
4925 actually expired, both locally and in the address. */
4926
4927 switch (host->status)
4928 {
4929 case hstatus_unusable:
4930 expired = FALSE;
4931 setflag(addrlist, af_retry_skipped);
4932 /* Fall through */
4933
4934 case hstatus_unusable_expired:
4935 switch (host->why)
4936 {
4937 case hwhy_retry: hosts_retry++; break;
4938 case hwhy_failed: hosts_fail++; break;
4939 case hwhy_insecure:
4940 case hwhy_deferred: hosts_defer++; break;
4941 }
4942
4943 /* If there was a retry message key, implying that previously there
4944 was a message-specific defer, we don't want to update the list of
4945 messages waiting for these hosts. */
4946
4947 if (retry_message_key) update_waiting = FALSE;
4948 continue; /* With the next host or IP address */
4949 }
4950 }
4951
4952 /* Second time round the loop: if the address is set but expired, and
4953 the message is newer than the last try, let it through. */
4954
4955 else
4956 {
4957 if ( !host->address
4958 || host->status != hstatus_unusable_expired
4959 || host->last_try > received_time.tv_sec)
4960 continue;
4961 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4962 host->name, host->address, pistring);
4963 host_is_expired = TRUE;
4964 }
4965
4966 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4967 it remains TRUE only if all hosts are expired and none are actually tried.
4968 */
4969
4970 expired = FALSE;
4971
4972 /* If this host is listed as one to which access must be serialized,
4973 see if another Exim process has a connection to it, and if so, skip
4974 this host. If not, update the database to record our connection to it
4975 and remember this for later deletion. Do not do any of this if we are
4976 sending the message down a pre-existing connection. */
4977
4978 if ( !continue_hostname
4979 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
4980 {
4981 serialize_key = string_sprintf("host-serialize-%s", host->name);
4982 if (!enq_start(serialize_key, 1))
4983 {
4984 DEBUG(D_transport)
4985 debug_printf("skipping host %s because another Exim process "
4986 "is connected to it\n", host->name);
4987 hosts_serial++;
4988 continue;
4989 }
4990 }
4991
4992 /* OK, we have an IP address that is not waiting for its retry time to
4993 arrive (it might be expired) OR (second time round the loop) we have an
4994 expired host that hasn't been tried since the message arrived. Have a go
4995 at delivering the message to it. First prepare the addresses by flushing
4996 out the result of previous attempts, and finding the first address that
4997 is still to be delivered. */
4998
4999 first_addr = prepare_addresses(addrlist, host);
5000
5001 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5002 message_id, host->name, host->address, addrlist->address,
5003 addrlist->next ? ", ..." : "");
5004
5005 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5006 message_id, host->name, host->address, pistring, addrlist->address,
5007 addrlist->next ? ", ..." : "");
5008
5009 /* This is not for real; don't do the delivery. If there are
5010 any remaining hosts, list them. */
5011
5012 if (f.dont_deliver)
5013 {
5014 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
5015 for (address_item * addr = addrlist; addr; addr = addr->next)
5016 {
5017 addr->host_used = host;
5018 addr->special_action = '*';
5019 addr->message = US"delivery bypassed by -N option";
5020 }
5021 DEBUG(D_transport)
5022 {
5023 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5024 "*** host and remaining hosts:\n", tblock->name);
5025 for (host_item * host2 = host; host2; host2 = host2->next)
5026 debug_printf(" %s [%s]\n", host2->name,
5027 host2->address ? host2->address : US"unset");
5028 }
5029 rc = OK;
5030 }
5031
5032 /* This is for real. If the host is expired, we don't count it for
5033 hosts_max_retry. This ensures that all hosts must expire before an address
5034 is timed out, unless hosts_max_try_hardlimit (which protects against
5035 lunatic DNS configurations) is reached.
5036
5037 If the host is not expired and we are about to hit the hosts_max_retry
5038 limit, check to see if there is a subsequent hosts with a different MX
5039 value. If so, make that the next host, and don't count this one. This is a
5040 heuristic to make sure that different MXs do get tried. With a normal kind
5041 of retry rule, they would get tried anyway when the earlier hosts were
5042 delayed, but if the domain has a "retry every time" type of rule - as is
5043 often used for the the very large ISPs, that won't happen. */
5044
5045 else
5046 {
5047 host_item * thost;
5048 /* Make a copy of the host if it is local to this invocation
5049 of the transport. */
5050
5051 if (expanded_hosts)
5052 {
5053 thost = store_get(sizeof(host_item), FALSE);
5054 *thost = *host;
5055 thost->name = string_copy(host->name);
5056 thost->address = string_copy(host->address);
5057 }
5058 else
5059 thost = host;
5060
5061 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5062 {
5063 DEBUG(D_transport)
5064 debug_printf("hosts_max_try limit reached with this host\n");
5065 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5066 {
5067 nexthost = h;
5068 unexpired_hosts_tried--;
5069 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5070 "and will be tried\n");
5071 break;
5072 }
5073 }
5074
5075 /* Attempt the delivery. */
5076
5077 total_hosts_tried++;
5078 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5079 &message_defer, FALSE);
5080
5081 /* Yield is one of:
5082 OK => connection made, each address contains its result;
5083 message_defer is set for message-specific defers (when all
5084 recipients are marked defer)
5085 DEFER => there was a non-message-specific delivery problem;
5086 ERROR => there was a problem setting up the arguments for a filter,
5087 or there was a problem with expanding added headers
5088 */
5089
5090 /* If the result is not OK, there was a non-message-specific problem.
5091 If the result is DEFER, we need to write to the logs saying what happened
5092 for this particular host, except in the case of authentication and TLS
5093 failures, where the log has already been written. If all hosts defer a
5094 general message is written at the end. */
5095
5096 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5097 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5098 write_logs(host, first_addr->message, first_addr->basic_errno);
5099
5100 #ifndef DISABLE_EVENT
5101 if (rc == DEFER)
5102 deferred_event_raise(first_addr, host);
5103 #endif
5104
5105 /* If STARTTLS was accepted, but there was a failure in setting up the
5106 TLS session (usually a certificate screwup), and the host is not in
5107 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5108 TLS forcibly turned off. We have to start from scratch with a new SMTP
5109 connection. That's why the retry is done from here, not from within
5110 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5111 session, so the in-clear transmission after those errors, if permitted,
5112 happens inside smtp_deliver().] */
5113
5114 #ifndef DISABLE_TLS
5115 if ( rc == DEFER
5116 && first_addr->basic_errno == ERRNO_TLSFAILURE
5117 && ob->tls_tempfail_tryclear
5118 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5119 )
5120 {
5121 log_write(0, LOG_MAIN,
5122 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5123 first_addr->message, host->name, host->address);
5124 first_addr = prepare_addresses(addrlist, host);
5125 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5126 &message_defer, TRUE);
5127 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5128 write_logs(host, first_addr->message, first_addr->basic_errno);
5129 # ifndef DISABLE_EVENT
5130 if (rc == DEFER)
5131 deferred_event_raise(first_addr, host);
5132 # endif
5133 }
5134 #endif /*DISABLE_TLS*/
5135 }
5136
5137 /* Delivery attempt finished */
5138
5139 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5140 message_id, host->name, host->address, pistring, addrlist->address,
5141 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5142
5143 /* Release serialization if set up */
5144
5145 if (serialize_key) enq_end(serialize_key);
5146
5147 /* If the result is DEFER, or if a host retry record is known to exist, we
5148 need to add an item to the retry chain for updating the retry database
5149 at the end of delivery. We only need to add the item to the top address,
5150 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5151 for any other delivery attempts using the same address. (It is copied into
5152 the unusable tree at the outer level, so even if different address blocks
5153 contain the same address, it still won't get tried again.) */
5154
5155 if (rc == DEFER || retry_host_key)
5156 {
5157 int delete_flag = rc != DEFER ? rf_delete : 0;
5158 if (!retry_host_key)
5159 {
5160 BOOL incl_ip;
5161 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5162 US"retry_include_ip_address", ob->retry_include_ip_address,
5163 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5164 incl_ip = TRUE; /* error; use most-specific retry record */
5165
5166 retry_host_key = incl_ip
5167 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5168 : string_sprintf("T:%S%s", host->name, pistring);
5169 }
5170
5171 /* If a delivery of another message over an existing SMTP connection
5172 yields DEFER, we do NOT set up retry data for the host. This covers the
5173 case when there are delays in routing the addresses in the second message
5174 that are so long that the server times out. This is alleviated by not
5175 routing addresses that previously had routing defers when handling an
5176 existing connection, but even so, this case may occur (e.g. if a
5177 previously happily routed address starts giving routing defers). If the
5178 host is genuinely down, another non-continued message delivery will
5179 notice it soon enough. */
5180
5181 if (delete_flag != 0 || !continue_hostname)
5182 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5183
5184 /* We may have tried an expired host, if its retry time has come; ensure
5185 the status reflects the expiry for the benefit of any other addresses. */
5186
5187 if (rc == DEFER)
5188 {
5189 host->status = host_is_expired
5190 ? hstatus_unusable_expired : hstatus_unusable;
5191 host->why = hwhy_deferred;
5192 }
5193 }
5194
5195 /* If message_defer is set (host was OK, but every recipient got deferred
5196 because of some message-specific problem), or if that had happened
5197 previously so that a message retry key exists, add an appropriate item
5198 to the retry chain. Note that if there was a message defer but now there is
5199 a host defer, the message defer record gets deleted. That seems perfectly
5200 reasonable. Also, stop the message from being remembered as waiting
5201 for specific hosts. */
5202
5203 if (message_defer || retry_message_key)
5204 {
5205 int delete_flag = message_defer ? 0 : rf_delete;
5206 if (!retry_message_key)
5207 {
5208 BOOL incl_ip;
5209 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5210 US"retry_include_ip_address", ob->retry_include_ip_address,
5211 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5212 incl_ip = TRUE; /* error; use most-specific retry record */
5213
5214 retry_message_key = incl_ip
5215 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5216 message_id)
5217 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5218 }
5219 retry_add_item(addrlist, retry_message_key,
5220 rf_message | rf_host | delete_flag);
5221 update_waiting = FALSE;
5222 }
5223
5224 /* Any return other than DEFER (that is, OK or ERROR) means that the
5225 addresses have got their final statuses filled in for this host. In the OK
5226 case, see if any of them are deferred. */
5227
5228 if (rc == OK)
5229 for (address_item * addr = addrlist; addr; addr = addr->next)
5230 if (addr->transport_return == DEFER)
5231 {
5232 some_deferred = TRUE;
5233 break;
5234 }
5235
5236 /* If no addresses deferred or the result was ERROR, return. We do this for
5237 ERROR because a failing filter set-up or add_headers expansion is likely to
5238 fail for any host we try. */
5239
5240 if (rc == ERROR || (rc == OK && !some_deferred))
5241 {
5242 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5243 return TRUE; /* Each address has its status */
5244 }
5245
5246 /* If the result was DEFER or some individual addresses deferred, let
5247 the loop run to try other hosts with the deferred addresses, except for the
5248 case when we were trying to deliver down an existing channel and failed.
5249 Don't try any other hosts in this case. */
5250
5251 if (continue_hostname) break;
5252
5253 /* If the whole delivery, or some individual addresses, were deferred and
5254 there are more hosts that could be tried, do not count this host towards
5255 the hosts_max_try limit if the age of the message is greater than the
5256 maximum retry time for this host. This means we may try try all hosts,
5257 ignoring the limit, when messages have been around for some time. This is
5258 important because if we don't try all hosts, the address will never time
5259 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5260
5261 if ((rc == DEFER || some_deferred) && nexthost)
5262 {
5263 BOOL timedout;
5264 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5265
5266 if (retry && retry->rules)
5267 {
5268 retry_rule *last_rule;
5269 for (last_rule = retry->rules;
5270 last_rule->next;
5271 last_rule = last_rule->next);
5272 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5273 }
5274 else timedout = TRUE; /* No rule => timed out */
5275
5276 if (timedout)
5277 {
5278 unexpired_hosts_tried--;
5279 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5280 "hosts_max_try (message older than host's retry time)\n");
5281 }
5282 }
5283
5284 DEBUG(D_transport)
5285 {
5286 if (unexpired_hosts_tried >= ob->hosts_max_try)
5287 debug_printf("reached transport hosts_max_try limit %d\n",
5288 ob->hosts_max_try);
5289 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5290 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5291 ob->hosts_max_try_hardlimit);
5292 }
5293
5294 testharness_pause_ms(500); /* let server debug out */
5295 } /* End of loop for trying multiple hosts. */
5296
5297 /* If we failed to find a matching host in the list, for an already-open
5298 connection, just close it and start over with the list. This can happen
5299 for routing that changes from run to run, or big multi-IP sites with
5300 round-robin DNS. */
5301
5302 if (continue_hostname && !continue_host_tried)
5303 {
5304 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5305
5306 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5307 #ifndef DISABLE_TLS
5308 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5309 transport */
5310 /*XXX doublecheck that! */
5311
5312 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5313 {
5314 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5315 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5316 cutthrough.cctx.tls_ctx = NULL;
5317 cutthrough.is_tls = FALSE;
5318 }
5319 else
5320 #else
5321 (void) write(fd, US"QUIT\r\n", 6);
5322 #endif
5323 (void) close(fd);
5324 cutthrough.cctx.sock = -1;
5325 continue_hostname = NULL;
5326 goto retry_non_continued;
5327 }
5328
5329 /* This is the end of the loop that repeats iff expired is TRUE and
5330 ob->delay_after_cutoff is FALSE. The second time round we will
5331 try those hosts that haven't been tried since the message arrived. */
5332
5333 DEBUG(D_transport)
5334 {
5335 debug_printf("all IP addresses skipped or deferred at least one address\n");
5336 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5337 debug_printf("retrying IP addresses not tried since message arrived\n");
5338 }
5339 }
5340
5341
5342 /* Get here if all IP addresses are skipped or defer at least one address. In
5343 MUA wrapper mode, this will happen only for connection or other non-message-
5344 specific failures. Force the delivery status for all addresses to FAIL. */
5345
5346 if (mua_wrapper)
5347 {
5348 for (address_item * addr = addrlist; addr; addr = addr->next)
5349 addr->transport_return = FAIL;
5350 goto END_TRANSPORT;
5351 }
5352
5353 /* In the normal, non-wrapper case, add a standard message to each deferred
5354 address if there hasn't been an error, that is, if it hasn't actually been
5355 tried this time. The variable "expired" will be FALSE if any deliveries were
5356 actually tried, or if there was at least one host that was not expired. That
5357 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5358 a delivery has been tried, an error code will be set, and the failing of the
5359 message is handled by the retry code later.
5360
5361 If queue_smtp is set, or this transport was called to send a subsequent message
5362 down an existing TCP/IP connection, and something caused the host not to be
5363 found, we end up here, but can detect these cases and handle them specially. */
5364
5365 for (address_item * addr = addrlist; addr; addr = addr->next)
5366 {
5367 /* If host is not NULL, it means that we stopped processing the host list
5368 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5369 means we need to behave as if some hosts were skipped because their retry
5370 time had not come. Specifically, this prevents the address from timing out.
5371 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5372 hosts were tried. */
5373
5374 if (host)
5375 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5376 {
5377 DEBUG(D_transport)
5378 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5379 "hosts were tried\n");
5380 }
5381 else
5382 {
5383 DEBUG(D_transport)
5384 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5385 setflag(addr, af_retry_skipped);
5386 }
5387
5388 if (f.queue_smtp) /* no deliveries attempted */
5389 {
5390 addr->transport_return = DEFER;
5391 addr->basic_errno = 0;
5392 addr->message = US"SMTP delivery explicitly queued";
5393 }
5394
5395 else if ( addr->transport_return == DEFER
5396 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5397 && !addr->message
5398 )
5399 {
5400 addr->basic_errno = ERRNO_HRETRY;
5401 if (continue_hostname)
5402 addr->message = US"no host found for existing SMTP connection";
5403 else if (expired)
5404 {
5405 setflag(addr, af_pass_message); /* This is not a security risk */
5406 addr->message = string_sprintf(
5407 "all hosts%s have been failing for a long time %s",
5408 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5409 ob->delay_after_cutoff
5410 ? US"(and retry time not reached)"
5411 : US"and were last tried after this message arrived");
5412
5413 /* If we are already using fallback hosts, or there are no fallback hosts
5414 defined, convert the result to FAIL to cause a bounce. */
5415
5416 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5417 addr->transport_return = FAIL;
5418 }
5419 else
5420 {
5421 const char * s;
5422 if (hosts_retry == hosts_total)
5423 s = "retry time not reached for any host%s";
5424 else if (hosts_fail == hosts_total)
5425 s = "all host address lookups%s failed permanently";
5426 else if (hosts_defer == hosts_total)
5427 s = "all host address lookups%s failed temporarily";
5428 else if (hosts_serial == hosts_total)
5429 s = "connection limit reached for all hosts%s";
5430 else if (hosts_fail+hosts_defer == hosts_total)
5431 s = "all host address lookups%s failed";
5432 else
5433 s = "some host address lookups failed and retry time "
5434 "not reached for other hosts or connection limit reached%s";
5435
5436 addr->message = string_sprintf(s,
5437 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5438 }
5439 }
5440 }
5441
5442 /* Update the database which keeps information about which messages are waiting
5443 for which hosts to become available. For some message-specific errors, the
5444 update_waiting flag is turned off because we don't want follow-on deliveries in
5445 those cases. If this transport instance is explicitly limited to one message
5446 per connection then follow-on deliveries are not possible and there's no need
5447 to create/update the per-transport wait-<transport_name> database. */
5448
5449 if (update_waiting && tblock->connection_max_messages != 1)
5450 transport_update_waiting(hostlist, tblock->name);
5451
5452 END_TRANSPORT:
5453
5454 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5455
5456 return TRUE; /* Each address has its status */
5457 }
5458
5459 #endif /*!MACRO_PREDEF*/
5460 /* vi: aw ai sw=2
5461 */
5462 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.