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exit-time debug
[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 #define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
22
23 optionlist smtp_transport_options[] = {
24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
25 OPT_OFF(transport_instance, expand_multi_domain) },
26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
27 LOFF(expand_retry_include_ip_address) },
28
29 { "address_retry_include_sender", opt_bool,
30 LOFF(address_retry_include_sender) },
31 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
32 #ifdef EXPERIMENTAL_ARC
33 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
34 #endif
35 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
36 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
37 { "command_timeout", opt_time, LOFF(command_timeout) },
38 { "connect_timeout", opt_time, LOFF(connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 OPT_OFF(transport_instance, connection_max_messages) },
41 # ifdef SUPPORT_DANE
42 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
43 # endif
44 { "data_timeout", opt_time, LOFF(data_timeout) },
45 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
46 #ifndef DISABLE_DKIM
47 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
49 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
50 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
51 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
53 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
54 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
55 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
56 #endif
57 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
58 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
60 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
61 { "dscp", opt_stringptr, LOFF(dscp) },
62 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
63 { "final_timeout", opt_time, LOFF(final_timeout) },
64 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
65 { "helo_data", opt_stringptr, LOFF(helo_data) },
66 { "hosts", opt_stringptr, LOFF(hosts) },
67 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
68 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
69 #ifndef DISABLE_TLS
70 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
71 #endif
72 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
73 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
74 #ifndef DISABLE_TLS
75 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
76 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
77 #endif
78 { "hosts_override", opt_bool, LOFF(hosts_override) },
79 #ifndef DISABLE_PIPE_CONNECT
80 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
81 #endif
82 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
83 #if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
84 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
85 #endif
86 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
87 #ifndef DISABLE_TLS
88 # ifdef SUPPORT_DANE
89 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
90 # endif
91 # ifndef DISABLE_OCSP
92 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
93 # endif
94 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
95 #endif
96 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
97 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
98 #ifdef SUPPORT_DANE
99 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
100 #endif
101 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
102 #ifndef DISABLE_PRDR
103 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
104 #endif
105 #ifndef DISABLE_TLS
106 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
107 #endif
108 { "interface", opt_stringptr, LOFF(interface) },
109 { "keepalive", opt_bool, LOFF(keepalive) },
110 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
111 { "max_rcpt", opt_int | opt_public,
112 OPT_OFF(transport_instance, max_addresses) },
113 { "multi_domain", opt_expand_bool | opt_public,
114 OPT_OFF(transport_instance, multi_domain) },
115 { "port", opt_stringptr, LOFF(port) },
116 { "protocol", opt_stringptr, LOFF(protocol) },
117 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
118 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
119 { "size_addition", opt_int, LOFF(size_addition) },
120 #ifdef SUPPORT_SOCKS
121 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
122 #endif
123 #ifndef DISABLE_TLS
124 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
125 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
126 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
127 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
128 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
129 # ifdef EXPERIMENTAL_TLS_RESUME
130 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
131 # endif
132 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
133 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
134 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
135 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
136 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
137 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
138 #endif
139 #ifdef SUPPORT_I18N
140 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
141 #endif
142 };
143
144 /* Size of the options list. An extern variable has to be used so that its
145 address can appear in the tables drtables.c. */
146
147 int smtp_transport_options_count = nelem(smtp_transport_options);
148
149
150 #ifdef MACRO_PREDEF
151
152 /* Dummy values */
153 smtp_transport_options_block smtp_transport_option_defaults = {0};
154 void smtp_transport_init(transport_instance *tblock) {}
155 BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
156 void smtp_transport_closedown(transport_instance *tblock) {}
157
158 #else /*!MACRO_PREDEF*/
159
160
161 /* Default private options block for the smtp transport. */
162
163 smtp_transport_options_block smtp_transport_option_defaults = {
164 .hosts = NULL,
165 .fallback_hosts = NULL,
166 .hostlist = NULL,
167 .fallback_hostlist = NULL,
168 .helo_data = US"$primary_hostname",
169 .interface = NULL,
170 .port = NULL,
171 .protocol = US"smtp",
172 .dscp = NULL,
173 .serialize_hosts = NULL,
174 .hosts_try_auth = NULL,
175 .hosts_require_auth = NULL,
176 .hosts_try_chunking = US"*",
177 #ifdef SUPPORT_DANE
178 .hosts_try_dane = US"*",
179 .hosts_require_dane = NULL,
180 .dane_require_tls_ciphers = NULL,
181 #endif
182 .hosts_try_fastopen = US"*",
183 #ifndef DISABLE_PRDR
184 .hosts_try_prdr = US"*",
185 #endif
186 #ifndef DISABLE_OCSP
187 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
188 .hosts_require_ocsp = NULL,
189 #endif
190 .hosts_require_tls = NULL,
191 .hosts_avoid_tls = NULL,
192 .hosts_verify_avoid_tls = NULL,
193 .hosts_avoid_pipelining = NULL,
194 #ifndef DISABLE_PIPE_CONNECT
195 .hosts_pipe_connect = NULL,
196 #endif
197 .hosts_avoid_esmtp = NULL,
198 #ifndef DISABLE_TLS
199 .hosts_nopass_tls = NULL,
200 .hosts_noproxy_tls = NULL,
201 #endif
202 .command_timeout = 5*60,
203 .connect_timeout = 5*60,
204 .data_timeout = 5*60,
205 .final_timeout = 10*60,
206 .size_addition = 1024,
207 .hosts_max_try = 5,
208 .hosts_max_try_hardlimit = 50,
209 .address_retry_include_sender = TRUE,
210 .allow_localhost = FALSE,
211 .authenticated_sender_force = FALSE,
212 .gethostbyname = FALSE,
213 .dns_qualify_single = TRUE,
214 .dns_search_parents = FALSE,
215 .dnssec = { .request= US"*", .require=NULL },
216 .delay_after_cutoff = TRUE,
217 .hosts_override = FALSE,
218 .hosts_randomize = FALSE,
219 .keepalive = TRUE,
220 .lmtp_ignore_quota = FALSE,
221 .expand_retry_include_ip_address = NULL,
222 .retry_include_ip_address = TRUE,
223 #ifdef SUPPORT_SOCKS
224 .socks_proxy = NULL,
225 #endif
226 #ifndef DISABLE_TLS
227 .tls_certificate = NULL,
228 .tls_crl = NULL,
229 .tls_privatekey = NULL,
230 .tls_require_ciphers = NULL,
231 .tls_sni = NULL,
232 .tls_verify_certificates = US"system",
233 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
234 .tls_tempfail_tryclear = TRUE,
235 # ifdef EXPERIMENTAL_TLS_RESUME
236 .tls_resumption_hosts = NULL,
237 # endif
238 .tls_verify_hosts = NULL,
239 .tls_try_verify_hosts = US"*",
240 .tls_verify_cert_hostnames = US"*",
241 #endif
242 #ifdef SUPPORT_I18N
243 .utf8_downconvert = NULL,
244 #endif
245 #ifndef DISABLE_DKIM
246 .dkim =
247 {.dkim_domain = NULL,
248 .dkim_identity = NULL,
249 .dkim_private_key = NULL,
250 .dkim_selector = NULL,
251 .dkim_canon = NULL,
252 .dkim_sign_headers = NULL,
253 .dkim_strict = NULL,
254 .dkim_hash = US"sha256",
255 .dkim_timestamps = NULL,
256 .dot_stuffed = FALSE,
257 .force_bodyhash = FALSE,
258 # ifdef EXPERIMENTAL_ARC
259 .arc_signspec = NULL,
260 # endif
261 },
262 # ifdef EXPERIMENTAL_ARC
263 .arc_sign = NULL,
264 # endif
265 #endif
266 };
267
268 /* some DSN flags for use later */
269
270 static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
272
273 static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
274
275
276
277 /* Local statics */
278
279 static uschar *smtp_command; /* Points to last cmd for error messages */
280 static uschar *mail_command; /* Points to MAIL cmd for error messages */
281 static uschar *data_command = US""; /* Points to DATA cmd for error messages */
282 static BOOL update_waiting; /* TRUE to update the "wait" database */
283
284 /*XXX move to smtp_context */
285 static BOOL pipelining_active; /* current transaction is in pipe mode */
286
287
288 static unsigned ehlo_response(uschar * buf, unsigned checks);
289
290
291 /******************************************************************************/
292
293 void
294 smtp_deliver_init(void)
295 {
296 if (!regex_PIPELINING) regex_PIPELINING =
297 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
298
299 if (!regex_SIZE) regex_SIZE =
300 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
301
302 if (!regex_AUTH) regex_AUTH =
303 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
304
305 #ifndef DISABLE_TLS
306 if (!regex_STARTTLS) regex_STARTTLS =
307 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
308 #endif
309
310 if (!regex_CHUNKING) regex_CHUNKING =
311 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
312
313 #ifndef DISABLE_PRDR
314 if (!regex_PRDR) regex_PRDR =
315 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
316 #endif
317
318 #ifdef SUPPORT_I18N
319 if (!regex_UTF8) regex_UTF8 =
320 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
321 #endif
322
323 if (!regex_DSN) regex_DSN =
324 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
325
326 if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
327 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
328
329 #ifndef DISABLE_PIPE_CONNECT
330 if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
331 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
332 #endif
333 }
334
335
336 /*************************************************
337 * Setup entry point *
338 *************************************************/
339
340 /* This function is called when the transport is about to be used,
341 but before running it in a sub-process. It is used for two things:
342
343 (1) To set the fallback host list in addresses, when delivering.
344 (2) To pass back the interface, port, protocol, and other options, for use
345 during callout verification.
346
347 Arguments:
348 tblock pointer to the transport instance block
349 addrlist list of addresses about to be transported
350 tf if not NULL, pointer to block in which to return options
351 uid the uid that will be set (not used)
352 gid the gid that will be set (not used)
353 errmsg place for error message (not used)
354
355 Returns: OK always (FAIL, DEFER not used)
356 */
357
358 static int
359 smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
360 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
361 {
362 smtp_transport_options_block *ob = SOB tblock->options_block;
363
364 errmsg = errmsg; /* Keep picky compilers happy */
365 uid = uid;
366 gid = gid;
367
368 /* Pass back options if required. This interface is getting very messy. */
369
370 if (tf)
371 {
372 tf->interface = ob->interface;
373 tf->port = ob->port;
374 tf->protocol = ob->protocol;
375 tf->hosts = ob->hosts;
376 tf->hosts_override = ob->hosts_override;
377 tf->hosts_randomize = ob->hosts_randomize;
378 tf->gethostbyname = ob->gethostbyname;
379 tf->qualify_single = ob->dns_qualify_single;
380 tf->search_parents = ob->dns_search_parents;
381 tf->helo_data = ob->helo_data;
382 }
383
384 /* Set the fallback host list for all the addresses that don't have fallback
385 host lists, provided that the local host wasn't present in the original host
386 list. */
387
388 if (!testflag(addrlist, af_local_host_removed))
389 for (; addrlist; addrlist = addrlist->next)
390 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
391
392 return OK;
393 }
394
395
396
397 /*************************************************
398 * Initialization entry point *
399 *************************************************/
400
401 /* Called for each instance, after its options have been read, to
402 enable consistency checks to be done, or anything else that needs
403 to be set up.
404
405 Argument: pointer to the transport instance block
406 Returns: nothing
407 */
408
409 void
410 smtp_transport_init(transport_instance *tblock)
411 {
412 smtp_transport_options_block *ob = SOB tblock->options_block;
413
414 /* Retry_use_local_part defaults FALSE if unset */
415
416 if (tblock->retry_use_local_part == TRUE_UNSET)
417 tblock->retry_use_local_part = FALSE;
418
419 /* Set the default port according to the protocol */
420
421 if (!ob->port)
422 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
423 ? US"lmtp"
424 : strcmpic(ob->protocol, US"smtps") == 0
425 ? US"smtps" : US"smtp";
426
427 /* Set up the setup entry point, to be called before subprocesses for this
428 transport. */
429
430 tblock->setup = smtp_transport_setup;
431
432 /* Complain if any of the timeouts are zero. */
433
434 if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
435 ob->final_timeout <= 0)
436 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
437 "command, data, or final timeout value is zero for %s transport",
438 tblock->name);
439
440 /* If hosts_override is set and there are local hosts, set the global
441 flag that stops verify from showing router hosts. */
442
443 if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
444
445 /* If there are any fallback hosts listed, build a chain of host items
446 for them, but do not do any lookups at this time. */
447
448 host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
449 }
450
451
452
453
454
455 /*************************************************
456 * Set delivery info into all active addresses *
457 *************************************************/
458
459 /* Only addresses whose status is >= PENDING are relevant. A lesser
460 status means that an address is not currently being processed.
461
462 Arguments:
463 addrlist points to a chain of addresses
464 errno_value to put in each address's errno field
465 msg to put in each address's message field
466 rc to put in each address's transport_return field
467 pass_message if TRUE, set the "pass message" flag in the address
468 host if set, mark addrs as having used this host
469 smtp_greeting from peer
470 helo_response from peer
471 start points to timestamp of delivery start
472
473 If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
474 the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
475 this particular type of timeout.
476
477 Returns: nothing
478 */
479
480 static void
481 set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
482 BOOL pass_message, host_item * host,
483 #ifdef EXPERIMENTAL_DSN_INFO
484 const uschar * smtp_greeting, const uschar * helo_response,
485 #endif
486 struct timeval * start
487 )
488 {
489 int orvalue = 0;
490 struct timeval deliver_time;
491
492 if (errno_value == ERRNO_CONNECTTIMEOUT)
493 {
494 errno_value = ETIMEDOUT;
495 orvalue = RTEF_CTOUT;
496 }
497 timesince(&deliver_time, start);
498
499 for (address_item * addr = addrlist; addr; addr = addr->next)
500 if (addr->transport_return >= PENDING)
501 {
502 addr->basic_errno = errno_value;
503 addr->more_errno |= orvalue;
504 addr->delivery_time = deliver_time;
505 if (msg)
506 {
507 addr->message = msg;
508 if (pass_message) setflag(addr, af_pass_message);
509 }
510 addr->transport_return = rc;
511 if (host)
512 {
513 addr->host_used = host;
514 #ifdef EXPERIMENTAL_DSN_INFO
515 if (smtp_greeting)
516 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
517 addr->smtp_greeting = smtp_greeting;
518
519 if (helo_response)
520 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
521 addr->helo_response = helo_response;
522 #endif
523 }
524 }
525 }
526
527 static void
528 set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
529 BOOL pass_message, struct timeval * start)
530 {
531 set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
532 #ifdef EXPERIMENTAL_DSN_INFO
533 NULL, NULL,
534 #endif
535 start);
536 }
537
538
539 /*************************************************
540 * Check an SMTP response *
541 *************************************************/
542
543 /* This function is given an errno code and the SMTP response buffer
544 to analyse, together with the host identification for generating messages. It
545 sets an appropriate message and puts the first digit of the response code into
546 the yield variable. If no response was actually read, a suitable digit is
547 chosen.
548
549 Arguments:
550 host the current host, to get its name for messages
551 errno_value pointer to the errno value
552 more_errno from the top address for use with ERRNO_FILTER_FAIL
553 buffer the SMTP response buffer
554 yield where to put a one-digit SMTP response code
555 message where to put an error message
556 pass_message set TRUE if message is an SMTP response
557
558 Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
559 */
560
561 static BOOL
562 check_response(host_item *host, int *errno_value, int more_errno,
563 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
564 {
565 uschar * pl = pipelining_active ? US"pipelined " : US"";
566 const uschar * s;
567
568 *yield = '4'; /* Default setting is to give a temporary error */
569
570 switch(*errno_value)
571 {
572 case ETIMEDOUT: /* Handle response timeout */
573 *message = US string_sprintf("SMTP timeout after %s%s",
574 pl, smtp_command);
575 if (transport_count > 0)
576 *message = US string_sprintf("%s (%d bytes written)", *message,
577 transport_count);
578 return FALSE;
579
580 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
581 s = string_printing(buffer);
582 while (isspace(*s)) s++;
583 *message = *s == 0
584 ? string_sprintf("Malformed SMTP reply (an empty line) "
585 "in response to %s%s", pl, smtp_command)
586 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
587 pl, smtp_command, s);
588 return FALSE;
589
590 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
591 GnuTLS and TLS1.3 */
592 *message = US"bad first read from TLS conn";
593 return TRUE;
594
595 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
596 can't send QUIT as we mustn't end the DATA. */
597 *message = string_sprintf("transport filter process failed (%d)%s",
598 more_errno,
599 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
600 return FALSE;
601
602 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
603 can't send QUIT as we mustn't end the DATA. */
604 *message =
605 string_sprintf("failed to expand headers_add or headers_remove: %s",
606 expand_string_message);
607 return FALSE;
608
609 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
610 *message = US"failed to write a data block";
611 return FALSE;
612
613 #ifdef SUPPORT_I18N
614 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
615 *message = US"utf8 support required but not offered for forwarding";
616 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
617 return TRUE;
618 #endif
619 }
620
621 /* Handle error responses from the remote mailer. */
622
623 if (buffer[0] != 0)
624 {
625 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
626 "%s", pl, smtp_command, s = string_printing(buffer));
627 *pass_message = TRUE;
628 *yield = buffer[0];
629 return TRUE;
630 }
631
632 /* No data was read. If there is no errno, this must be the EOF (i.e.
633 connection closed) case, which causes deferral. An explicit connection reset
634 error has the same effect. Otherwise, put the host's identity in the message,
635 leaving the errno value to be interpreted as well. In all cases, we have to
636 assume the connection is now dead. */
637
638 if (*errno_value == 0 || *errno_value == ECONNRESET)
639 {
640 *errno_value = ERRNO_SMTPCLOSED;
641 *message = US string_sprintf("Remote host closed connection "
642 "in response to %s%s", pl, smtp_command);
643 }
644 else
645 *message = US string_sprintf("%s [%s]", host->name, host->address);
646
647 return FALSE;
648 }
649
650
651
652 /*************************************************
653 * Write error message to logs *
654 *************************************************/
655
656 /* This writes to the main log and to the message log.
657
658 Arguments:
659 host the current host
660 detail the current message (addr_item->message)
661 basic_errno the errno (addr_item->basic_errno)
662
663 Returns: nothing
664 */
665
666 static void
667 write_logs(const host_item *host, const uschar *suffix, int basic_errno)
668 {
669 gstring * message = LOGGING(outgoing_port)
670 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
671 host->port == PORT_NONE ? 25 : host->port)
672 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
673
674 if (suffix)
675 {
676 message = string_fmt_append(message, ": %s", suffix);
677 if (basic_errno > 0)
678 message = string_fmt_append(message, ": %s", strerror(basic_errno));
679 }
680 else
681 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
682
683 log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
684 deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
685 }
686
687 static void
688 msglog_line(host_item * host, uschar * message)
689 {
690 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
691 host->name, host->address, message);
692 }
693
694
695
696 #ifndef DISABLE_EVENT
697 /*************************************************
698 * Post-defer action *
699 *************************************************/
700
701 /* This expands an arbitrary per-transport string.
702 It might, for example, be used to write to the database log.
703
704 Arguments:
705 addr the address item containing error information
706 host the current host
707 evstr the event
708
709 Returns: nothing
710 */
711
712 static void
713 deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
714 {
715 uschar * action = addr->transport->event_action;
716 const uschar * save_domain;
717 uschar * save_local;
718
719 if (!action)
720 return;
721
722 save_domain = deliver_domain;
723 save_local = deliver_localpart;
724
725 /*XXX would ip & port already be set up? */
726 deliver_host_address = string_copy(host->address);
727 deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
728 event_defer_errno = addr->basic_errno;
729
730 router_name = addr->router->name;
731 transport_name = addr->transport->name;
732 deliver_domain = addr->domain;
733 deliver_localpart = addr->local_part;
734
735 (void) event_raise(action, evstr,
736 addr->message
737 ? addr->basic_errno > 0
738 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
739 : string_copy(addr->message)
740 : addr->basic_errno > 0
741 ? string_copy(US strerror(addr->basic_errno))
742 : NULL);
743
744 deliver_localpart = save_local;
745 deliver_domain = save_domain;
746 router_name = transport_name = NULL;
747 }
748 #endif
749
750 /*************************************************
751 * Reap SMTP specific responses *
752 *************************************************/
753 static int
754 smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
755 int count)
756 {
757 uschar flushbuffer[4096];
758
759 while (count-- > 0)
760 {
761 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
762 '2', ob->command_timeout)
763 && (errno != 0 || flushbuffer[0] == 0))
764 break;
765 }
766 return count;
767 }
768
769
770 /* Return boolean success */
771
772 static BOOL
773 smtp_reap_banner(smtp_context * sx)
774 {
775 BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
776 '2', (SOB sx->conn_args.ob)->command_timeout);
777 #ifdef EXPERIMENTAL_DSN_INFO
778 sx->smtp_greeting = string_copy(sx->buffer);
779 #endif
780 return good_response;
781 }
782
783 static BOOL
784 smtp_reap_ehlo(smtp_context * sx)
785 {
786 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
787 (SOB sx->conn_args.ob)->command_timeout))
788 {
789 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
790 {
791 #ifdef EXPERIMENTAL_DSN_INFO
792 sx->helo_response = string_copy(sx->buffer);
793 #endif
794 return FALSE;
795 }
796 sx->esmtp = FALSE;
797 }
798 #ifdef EXPERIMENTAL_DSN_INFO
799 sx->helo_response = string_copy(sx->buffer);
800 #endif
801 #ifndef DISABLE_EVENT
802 (void) event_raise(sx->conn_args.tblock->event_action,
803 US"smtp:ehlo", sx->buffer);
804 #endif
805 return TRUE;
806 }
807
808
809
810 #ifndef DISABLE_PIPE_CONNECT
811 static uschar *
812 ehlo_cache_key(const smtp_context * sx)
813 {
814 host_item * host = sx->conn_args.host;
815 return Ustrchr(host->address, ':')
816 ? string_sprintf("[%s]:%d.EHLO", host->address,
817 host->port == PORT_NONE ? sx->port : host->port)
818 : string_sprintf("%s:%d.EHLO", host->address,
819 host->port == PORT_NONE ? sx->port : host->port);
820 }
821
822 static void
823 write_ehlo_cache_entry(const smtp_context * sx)
824 {
825 open_db dbblock, * dbm_file;
826
827 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
828 {
829 uschar * ehlo_resp_key = ehlo_cache_key(sx);
830 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
831
832 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
833 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
834 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
835
836 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
837 dbfn_close(dbm_file);
838 }
839 }
840
841 static void
842 invalidate_ehlo_cache_entry(smtp_context * sx)
843 {
844 open_db dbblock, * dbm_file;
845
846 if ( sx->early_pipe_active
847 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
848 {
849 uschar * ehlo_resp_key = ehlo_cache_key(sx);
850 dbfn_delete(dbm_file, ehlo_resp_key);
851 dbfn_close(dbm_file);
852 }
853 }
854
855 static BOOL
856 read_ehlo_cache_entry(smtp_context * sx)
857 {
858 open_db dbblock;
859 open_db * dbm_file;
860
861 if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
862 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
863 else
864 {
865 uschar * ehlo_resp_key = ehlo_cache_key(sx);
866 dbdata_ehlo_resp * er;
867
868 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
869 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
870 else if (time(NULL) - er->time_stamp > retry_data_expire)
871 {
872 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
873 dbfn_close(dbm_file);
874 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
875 dbfn_delete(dbm_file, ehlo_resp_key);
876 }
877 else
878 {
879 sx->ehlo_resp = er->data;
880 dbfn_close(dbm_file);
881 DEBUG(D_transport) debug_printf(
882 "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
883 er->data.cleartext_features, er->data.cleartext_auths,
884 er->data.crypted_features, er->data.crypted_auths);
885 return TRUE;
886 }
887 dbfn_close(dbm_file);
888 }
889 return FALSE;
890 }
891
892
893
894 /* Return an auths bitmap for the set of AUTH methods offered by the server
895 which match our authenticators. */
896
897 static unsigned short
898 study_ehlo_auths(smtp_context * sx)
899 {
900 uschar * names;
901 auth_instance * au;
902 uschar authnum;
903 unsigned short authbits = 0;
904
905 if (!sx->esmtp) return 0;
906 if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
907 if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
908 expand_nmax = -1; /* reset */
909 names = string_copyn(expand_nstring[1], expand_nlength[1]);
910
911 for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
912 {
913 const uschar * list = names;
914 int sep = ' ';
915 uschar name[32];
916
917 while (string_nextinlist(&list, &sep, name, sizeof(name)))
918 if (strcmpic(au->public_name, name) == 0)
919 { authbits |= BIT(authnum); break; }
920 }
921
922 DEBUG(D_transport)
923 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
924 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
925
926 if (tls_out.active.sock >= 0)
927 sx->ehlo_resp.crypted_auths = authbits;
928 else
929 sx->ehlo_resp.cleartext_auths = authbits;
930 return authbits;
931 }
932
933
934
935
936 /* Wait for and check responses for early-pipelining.
937
938 Called from the lower-level smtp_read_response() function
939 used for general code that assume synchronisation, if context
940 flags indicate outstanding early-pipelining commands. Also
941 called fom sync_responses() which handles pipelined commands.
942
943 Arguments:
944 sx smtp connection context
945 countp number of outstanding responses, adjusted on return
946
947 Return:
948 OK all well
949 DEFER error on first read of TLS'd conn
950 FAIL SMTP error in response
951 */
952 int
953 smtp_reap_early_pipe(smtp_context * sx, int * countp)
954 {
955 BOOL pending_BANNER = sx->pending_BANNER;
956 BOOL pending_EHLO = sx->pending_EHLO;
957 int rc = FAIL;
958
959 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
960 sx->pending_EHLO = FALSE;
961
962 if (pending_BANNER)
963 {
964 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
965 (*countp)--;
966 if (!smtp_reap_banner(sx))
967 {
968 DEBUG(D_transport) debug_printf("bad banner\n");
969 if (tls_out.active.sock >= 0) rc = DEFER;
970 goto fail;
971 }
972 }
973
974 if (pending_EHLO)
975 {
976 unsigned peer_offered;
977 unsigned short authbits = 0, * ap;
978
979 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
980 (*countp)--;
981 if (!smtp_reap_ehlo(sx))
982 {
983 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
984 if (tls_out.active.sock >= 0) rc = DEFER;
985 goto fail;
986 }
987
988 /* Compare the actual EHLO response to the cached value we assumed;
989 on difference, dump or rewrite the cache and arrange for a retry. */
990
991 ap = tls_out.active.sock < 0
992 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
993
994 peer_offered = ehlo_response(sx->buffer,
995 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
996 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
997 | OPTION_UTF8 | OPTION_EARLY_PIPE
998 );
999 if ( peer_offered != sx->peer_offered
1000 || (authbits = study_ehlo_auths(sx)) != *ap)
1001 {
1002 HDEBUG(D_transport)
1003 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1004 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1005 sx->peer_offered, *ap, peer_offered, authbits);
1006 *(tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1008 *ap = authbits;
1009 if (peer_offered & OPTION_EARLY_PIPE)
1010 write_ehlo_cache_entry(sx);
1011 else
1012 invalidate_ehlo_cache_entry(sx);
1013
1014 return OK; /* just carry on */
1015 }
1016 }
1017 return OK;
1018
1019 fail:
1020 invalidate_ehlo_cache_entry(sx);
1021 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1022 return rc;
1023 }
1024 #endif
1025
1026
1027 /*************************************************
1028 * Synchronize SMTP responses *
1029 *************************************************/
1030
1031 /* This function is called from smtp_deliver() to receive SMTP responses from
1032 the server, and match them up with the commands to which they relate. When
1033 PIPELINING is not in use, this function is called after every command, and is
1034 therefore somewhat over-engineered, but it is simpler to use a single scheme
1035 that works both with and without PIPELINING instead of having two separate sets
1036 of code.
1037
1038 The set of commands that are buffered up with pipelining may start with MAIL
1039 and may end with DATA; in between are RCPT commands that correspond to the
1040 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1041 etc.) are never buffered.
1042
1043 Errors after MAIL or DATA abort the whole process leaving the response in the
1044 buffer. After MAIL, pending responses are flushed, and the original command is
1045 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1046 permitted to reject some recipient addresses while accepting others. However
1047 certain errors clearly abort the whole process. Set the value in
1048 transport_return to PENDING_OK if the address is accepted. If there is a
1049 subsequent general error, it will get reset accordingly. If not, it will get
1050 converted to OK at the end.
1051
1052 Arguments:
1053 sx smtp connection context
1054 count the number of responses to read
1055 pending_DATA 0 if last command sent was not DATA
1056 +1 if previously had a good recipient
1057 -1 if not previously had a good recipient
1058
1059 Returns: 3 if at least one address had 2xx and one had 5xx
1060 2 if at least one address had 5xx but none had 2xx
1061 1 if at least one host had a 2xx response, but none had 5xx
1062 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1063 -1 timeout while reading RCPT response
1064 -2 I/O or other non-response error for RCPT
1065 -3 DATA or MAIL failed - errno and buffer set
1066 -4 banner or EHLO failed (early-pipelining)
1067 -5 banner or EHLO failed (early-pipelining, TLS)
1068 */
1069
1070 static int
1071 sync_responses(smtp_context * sx, int count, int pending_DATA)
1072 {
1073 address_item * addr = sx->sync_addr;
1074 smtp_transport_options_block * ob = sx->conn_args.ob;
1075 int yield = 0;
1076
1077 #ifndef DISABLE_PIPE_CONNECT
1078 int rc;
1079 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1080 return rc == FAIL ? -4 : -5;
1081 #endif
1082
1083 /* Handle the response for a MAIL command. On error, reinstate the original
1084 command in big_buffer for error message use, and flush any further pending
1085 responses before returning, except after I/O errors and timeouts. */
1086
1087 if (sx->pending_MAIL)
1088 {
1089 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1090 count--;
1091 sx->pending_MAIL = FALSE;
1092 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1093 '2', ob->command_timeout))
1094 {
1095 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1096 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1097 if (errno == ERRNO_TLSFAILURE)
1098 return -5;
1099 if (errno == 0 && sx->buffer[0] != 0)
1100 {
1101 int save_errno = 0;
1102 if (sx->buffer[0] == '4')
1103 {
1104 save_errno = ERRNO_MAIL4XX;
1105 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1106 }
1107 count = smtp_discard_responses(sx, ob, count);
1108 errno = save_errno;
1109 }
1110
1111 if (pending_DATA) count--; /* Number of RCPT responses to come */
1112 while (count-- > 0) /* Mark any pending addrs with the host used */
1113 {
1114 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1115 addr->host_used = sx->conn_args.host;
1116 addr = addr->next;
1117 }
1118 return -3;
1119 }
1120 }
1121
1122 if (pending_DATA) count--; /* Number of RCPT responses to come */
1123
1124 /* Read and handle the required number of RCPT responses, matching each one up
1125 with an address by scanning for the next address whose status is PENDING_DEFER.
1126 */
1127
1128 while (count-- > 0)
1129 {
1130 while (addr->transport_return != PENDING_DEFER)
1131 if (!(addr = addr->next))
1132 return -2;
1133
1134 /* The address was accepted */
1135 addr->host_used = sx->conn_args.host;
1136
1137 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1138 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1139 '2', ob->command_timeout))
1140 {
1141 yield |= 1;
1142 addr->transport_return = PENDING_OK;
1143
1144 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1145 ensure that any address-specific retry record is expunged. We do this both
1146 for the basic key and for the version that also includes the sender. */
1147
1148 if (testflag(addr, af_dr_retry_exists))
1149 {
1150 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1151 sender_address);
1152 retry_add_item(addr, altkey, rf_delete);
1153 retry_add_item(addr, addr->address_retry_key, rf_delete);
1154 }
1155 }
1156
1157 /* Error on first TLS read */
1158
1159 else if (errno == ERRNO_TLSFAILURE)
1160 return -5;
1161
1162 /* Timeout while reading the response */
1163
1164 else if (errno == ETIMEDOUT)
1165 {
1166 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1167 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1168 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1169 retry_add_item(addr, addr->address_retry_key, 0);
1170 update_waiting = FALSE;
1171 return -1;
1172 }
1173
1174 /* Handle other errors in obtaining an SMTP response by returning -1. This
1175 will cause all the addresses to be deferred. Restore the SMTP command in
1176 big_buffer for which we are checking the response, so the error message
1177 makes sense. */
1178
1179 else if (errno != 0 || sx->buffer[0] == 0)
1180 {
1181 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1182
1183 /* Use taint-unchecked routines for writing into big_buffer, trusting
1184 that we'll never expand it. */
1185
1186 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1187 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1188 string_from_gstring(g);
1189 return -2;
1190 }
1191
1192 /* Handle SMTP permanent and temporary response codes. */
1193
1194 else
1195 {
1196 addr->message =
1197 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1198 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1199 string_printing(sx->buffer));
1200 setflag(addr, af_pass_message);
1201 if (!sx->verify)
1202 msglog_line(sx->conn_args.host, addr->message);
1203
1204 /* The response was 5xx */
1205
1206 if (sx->buffer[0] == '5')
1207 {
1208 addr->transport_return = FAIL;
1209 yield |= 2;
1210 }
1211
1212 /* The response was 4xx */
1213
1214 else
1215 {
1216 addr->transport_return = DEFER;
1217 addr->basic_errno = ERRNO_RCPT4XX;
1218 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1219
1220 if (!sx->verify)
1221 {
1222 #ifndef DISABLE_EVENT
1223 event_defer_errno = addr->more_errno;
1224 msg_event_raise(US"msg:rcpt:host:defer", addr);
1225 #endif
1226 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1227 start point for another MAIL command. */
1228
1229 if (addr->more_errno >> 8 == 52 && yield & 3)
1230 {
1231 if (!sx->RCPT_452)
1232 {
1233 DEBUG(D_transport)
1234 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1235 sx->RCPT_452 = TRUE;
1236 sx->next_addr = addr;
1237 }
1238 addr->transport_return = PENDING_DEFER;
1239 addr->basic_errno = 0;
1240 }
1241 else
1242 {
1243 /* Log temporary errors if there are more hosts to be tried.
1244 If not, log this last one in the == line. */
1245
1246 if (sx->conn_args.host->next)
1247 if (LOGGING(outgoing_port))
1248 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1249 sx->conn_args.host->address,
1250 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1251 else
1252 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1253 sx->conn_args.host->address, addr->message);
1254
1255 #ifndef DISABLE_EVENT
1256 else
1257 msg_event_raise(US"msg:rcpt:defer", addr);
1258 #endif
1259
1260 /* Do not put this message on the list of those waiting for specific
1261 hosts, as otherwise it is likely to be tried too often. */
1262
1263 update_waiting = FALSE;
1264
1265 /* Add a retry item for the address so that it doesn't get tried again
1266 too soon. If address_retry_include_sender is true, add the sender address
1267 to the retry key. */
1268
1269 retry_add_item(addr,
1270 ob->address_retry_include_sender
1271 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1272 : addr->address_retry_key,
1273 0);
1274 }
1275 }
1276 }
1277 }
1278 } /* Loop for next RCPT response */
1279
1280 /* Update where to start at for the next block of responses, unless we
1281 have already handled all the addresses. */
1282
1283 if (addr) sx->sync_addr = addr->next;
1284
1285 /* Handle a response to DATA. If we have not had any good recipients, either
1286 previously or in this block, the response is ignored. */
1287
1288 if (pending_DATA != 0)
1289 {
1290 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1291 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1292 '3', ob->command_timeout))
1293 {
1294 int code;
1295 uschar *msg;
1296 BOOL pass_message;
1297
1298 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1299 return -5;
1300
1301 if (pending_DATA > 0 || (yield & 1) != 0)
1302 {
1303 if (errno == 0 && sx->buffer[0] == '4')
1304 {
1305 errno = ERRNO_DATA4XX;
1306 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1307 }
1308 return -3;
1309 }
1310 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1311 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1312 "is in use and there were no good recipients\n", msg);
1313 }
1314 }
1315
1316 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1317 present) received 3xx. If any RCPTs were handled and yielded anything other
1318 than 4xx, yield will be set non-zero. */
1319
1320 return yield;
1321 }
1322
1323
1324
1325
1326
1327 /* Try an authenticator's client entry */
1328
1329 static int
1330 try_authenticator(smtp_context * sx, auth_instance * au)
1331 {
1332 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1333 host_item * host = sx->conn_args.host; /* host to deliver to */
1334 int rc;
1335
1336 sx->outblock.authenticating = TRUE;
1337 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1338 sx->buffer, sizeof(sx->buffer));
1339 sx->outblock.authenticating = FALSE;
1340 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1341
1342 /* A temporary authentication failure must hold up delivery to
1343 this host. After a permanent authentication failure, we carry on
1344 to try other authentication methods. If all fail hard, try to
1345 deliver the message unauthenticated unless require_auth was set. */
1346
1347 switch(rc)
1348 {
1349 case OK:
1350 f.smtp_authenticated = TRUE; /* stops the outer loop */
1351 client_authenticator = au->name;
1352 if (au->set_client_id)
1353 client_authenticated_id = expand_string(au->set_client_id);
1354 break;
1355
1356 /* Failure after writing a command */
1357
1358 case FAIL_SEND:
1359 return FAIL_SEND;
1360
1361 /* Failure after reading a response */
1362
1363 case FAIL:
1364 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1365 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1366 au->name, host->name, host->address, sx->buffer);
1367 break;
1368
1369 /* Failure by some other means. In effect, the authenticator
1370 decided it wasn't prepared to handle this case. Typically this
1371 is the result of "fail" in an expansion string. Do we need to
1372 log anything here? Feb 2006: a message is now put in the buffer
1373 if logging is required. */
1374
1375 case CANCELLED:
1376 if (*sx->buffer != 0)
1377 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1378 "authentication H=%s [%s] %s", au->name, host->name,
1379 host->address, sx->buffer);
1380 break;
1381
1382 /* Internal problem, message in buffer. */
1383
1384 case ERROR:
1385 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1386 DEFER, FALSE, &sx->delivery_start);
1387 return ERROR;
1388 }
1389 return OK;
1390 }
1391
1392
1393
1394
1395 /* Do the client side of smtp-level authentication.
1396
1397 Arguments:
1398 sx smtp connection context
1399
1400 sx->buffer should have the EHLO response from server (gets overwritten)
1401
1402 Returns:
1403 OK Success, or failed (but not required): global "smtp_authenticated" set
1404 DEFER Failed authentication (and was required)
1405 ERROR Internal problem
1406
1407 FAIL_SEND Failed communications - transmit
1408 FAIL - response
1409 */
1410
1411 static int
1412 smtp_auth(smtp_context * sx)
1413 {
1414 host_item * host = sx->conn_args.host; /* host to deliver to */
1415 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1416 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1417 #ifndef DISABLE_PIPE_CONNECT
1418 unsigned short authbits = tls_out.active.sock >= 0
1419 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1420 #endif
1421 uschar * fail_reason = US"server did not advertise AUTH support";
1422
1423 f.smtp_authenticated = FALSE;
1424 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1425
1426 if (!regex_AUTH)
1427 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1428
1429 /* Is the server offering AUTH? */
1430
1431 if ( sx->esmtp
1432 &&
1433 #ifndef DISABLE_PIPE_CONNECT
1434 sx->early_pipe_active ? authbits
1435 :
1436 #endif
1437 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1438 )
1439 {
1440 uschar * names = NULL;
1441 expand_nmax = -1; /* reset */
1442
1443 #ifndef DISABLE_PIPE_CONNECT
1444 if (!sx->early_pipe_active)
1445 #endif
1446 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1447
1448 /* Must not do this check until after we have saved the result of the
1449 regex match above as the check could be another RE. */
1450
1451 if ( require_auth == OK
1452 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1453 {
1454 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1455 fail_reason = US"no common mechanisms were found";
1456
1457 #ifndef DISABLE_PIPE_CONNECT
1458 if (sx->early_pipe_active)
1459 {
1460 /* Scan our authenticators (which support use by a client and were offered
1461 by the server (checked at cache-write time)), not suppressed by
1462 client_condition. If one is found, attempt to authenticate by calling its
1463 client function. We are limited to supporting up to 16 authenticator
1464 public-names by the number of bits in a short. */
1465
1466 auth_instance * au;
1467 uschar bitnum;
1468 int rc;
1469
1470 for (bitnum = 0, au = auths;
1471 !f.smtp_authenticated && au && bitnum < 16;
1472 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1473 {
1474 if ( au->client_condition
1475 && !expand_check_condition(au->client_condition, au->name,
1476 US"client authenticator"))
1477 {
1478 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1479 au->name, "client_condition is false");
1480 continue;
1481 }
1482
1483 /* Found data for a listed mechanism. Call its client entry. Set
1484 a flag in the outblock so that data is overwritten after sending so
1485 that reflections don't show it. */
1486
1487 fail_reason = US"authentication attempt(s) failed";
1488
1489 if ((rc = try_authenticator(sx, au)) != OK)
1490 return rc;
1491 }
1492 }
1493 else
1494 #endif
1495
1496 /* Scan the configured authenticators looking for one which is configured
1497 for use as a client, which is not suppressed by client_condition, and
1498 whose name matches an authentication mechanism supported by the server.
1499 If one is found, attempt to authenticate by calling its client function.
1500 */
1501
1502 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1503 {
1504 uschar *p = names;
1505
1506 if ( !au->client
1507 || ( au->client_condition
1508 && !expand_check_condition(au->client_condition, au->name,
1509 US"client authenticator")))
1510 {
1511 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1512 au->name,
1513 (au->client)? "client_condition is false" :
1514 "not configured as a client");
1515 continue;
1516 }
1517
1518 /* Loop to scan supported server mechanisms */
1519
1520 while (*p)
1521 {
1522 int len = Ustrlen(au->public_name);
1523 int rc;
1524
1525 while (isspace(*p)) p++;
1526
1527 if (strncmpic(au->public_name, p, len) != 0 ||
1528 (p[len] != 0 && !isspace(p[len])))
1529 {
1530 while (*p != 0 && !isspace(*p)) p++;
1531 continue;
1532 }
1533
1534 /* Found data for a listed mechanism. Call its client entry. Set
1535 a flag in the outblock so that data is overwritten after sending so
1536 that reflections don't show it. */
1537
1538 fail_reason = US"authentication attempt(s) failed";
1539
1540 if ((rc = try_authenticator(sx, au)) != OK)
1541 return rc;
1542
1543 break; /* If not authenticated, try next authenticator */
1544 } /* Loop for scanning supported server mechanisms */
1545 } /* Loop for further authenticators */
1546 }
1547 }
1548
1549 /* If we haven't authenticated, but are required to, give up. */
1550
1551 if (require_auth == OK && !f.smtp_authenticated)
1552 {
1553 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1554 string_sprintf("authentication required but %s", fail_reason), DEFER,
1555 FALSE, &sx->delivery_start);
1556 return DEFER;
1557 }
1558
1559 return OK;
1560 }
1561
1562
1563 /* Construct AUTH appendix string for MAIL TO */
1564 /*
1565 Arguments
1566 sx context for smtp connection
1567 p point in sx->buffer to build string
1568 addrlist chain of potential addresses to deliver
1569
1570 Globals f.smtp_authenticated
1571 client_authenticated_sender
1572 Return True on error, otherwise buffer has (possibly empty) terminated string
1573 */
1574
1575 static BOOL
1576 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1577 {
1578 smtp_transport_options_block * ob = sx->conn_args.ob;
1579 uschar * local_authenticated_sender = authenticated_sender;
1580
1581 #ifdef notdef
1582 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1583 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1584 #endif
1585
1586 if (ob->authenticated_sender)
1587 {
1588 uschar * new = expand_string(ob->authenticated_sender);
1589 if (!new)
1590 {
1591 if (!f.expand_string_forcedfail)
1592 {
1593 uschar *message = string_sprintf("failed to expand "
1594 "authenticated_sender: %s", expand_string_message);
1595 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1596 return TRUE;
1597 }
1598 }
1599 else if (*new)
1600 local_authenticated_sender = new;
1601 }
1602
1603 /* Add the authenticated sender address if present */
1604
1605 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1606 && local_authenticated_sender)
1607 {
1608 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1609 auth_xtextencode(local_authenticated_sender,
1610 Ustrlen(local_authenticated_sender)));
1611 client_authenticated_sender = string_copy(local_authenticated_sender);
1612 }
1613 else
1614 *p = 0;
1615
1616 return FALSE;
1617 }
1618
1619
1620
1621 typedef struct smtp_compare_s
1622 {
1623 uschar *current_sender_address;
1624 struct transport_instance *tblock;
1625 } smtp_compare_t;
1626
1627
1628 /* Create a unique string that identifies this message, it is based on
1629 sender_address, helo_data and tls_certificate if enabled.
1630 */
1631
1632 static uschar *
1633 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1634 {
1635 address_item * addr1;
1636 uschar * if1 = US"";
1637 uschar * helo1 = US"";
1638 #ifndef DISABLE_TLS
1639 uschar * tlsc1 = US"";
1640 #endif
1641 uschar * save_sender_address = sender_address;
1642 uschar * local_identity = NULL;
1643 smtp_transport_options_block * ob = SOB tblock->options_block;
1644
1645 sender_address = sender;
1646
1647 addr1 = deliver_make_addr (sender, TRUE);
1648 deliver_set_expansions(addr1);
1649
1650 if (ob->interface)
1651 if1 = expand_string(ob->interface);
1652
1653 if (ob->helo_data)
1654 helo1 = expand_string(ob->helo_data);
1655
1656 #ifndef DISABLE_TLS
1657 if (ob->tls_certificate)
1658 tlsc1 = expand_string(ob->tls_certificate);
1659 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1660 #else
1661 local_identity = string_sprintf ("%s^%s", if1, helo1);
1662 #endif
1663
1664 deliver_set_expansions(NULL);
1665 sender_address = save_sender_address;
1666
1667 return local_identity;
1668 }
1669
1670
1671
1672 /* This routine is a callback that is called from transport_check_waiting.
1673 This function will evaluate the incoming message versus the previous
1674 message. If the incoming message is using a different local identity then
1675 we will veto this new message. */
1676
1677 static BOOL
1678 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1679 {
1680 uschar * message_local_identity,
1681 * current_local_identity,
1682 * new_sender_address;
1683
1684 current_local_identity =
1685 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1686
1687 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1688 return FALSE;
1689
1690 message_local_identity =
1691 smtp_local_identity(new_sender_address, s_compare->tblock);
1692
1693 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1694 }
1695
1696
1697
1698 static unsigned
1699 ehlo_response(uschar * buf, unsigned checks)
1700 {
1701 size_t bsize = Ustrlen(buf);
1702
1703 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1704
1705 #ifndef DISABLE_TLS
1706 if ( checks & OPTION_TLS
1707 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1708 #endif
1709 checks &= ~OPTION_TLS;
1710
1711 if ( checks & OPTION_IGNQ
1712 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1713 PCRE_EOPT, NULL, 0) < 0)
1714 checks &= ~OPTION_IGNQ;
1715
1716 if ( checks & OPTION_CHUNKING
1717 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1718 checks &= ~OPTION_CHUNKING;
1719
1720 #ifndef DISABLE_PRDR
1721 if ( checks & OPTION_PRDR
1722 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1723 #endif
1724 checks &= ~OPTION_PRDR;
1725
1726 #ifdef SUPPORT_I18N
1727 if ( checks & OPTION_UTF8
1728 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1729 #endif
1730 checks &= ~OPTION_UTF8;
1731
1732 if ( checks & OPTION_DSN
1733 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1734 checks &= ~OPTION_DSN;
1735
1736 if ( checks & OPTION_PIPE
1737 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1738 PCRE_EOPT, NULL, 0) < 0)
1739 checks &= ~OPTION_PIPE;
1740
1741 if ( checks & OPTION_SIZE
1742 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1743 checks &= ~OPTION_SIZE;
1744
1745 #ifndef DISABLE_PIPE_CONNECT
1746 if ( checks & OPTION_EARLY_PIPE
1747 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1748 PCRE_EOPT, NULL, 0) < 0)
1749 #endif
1750 checks &= ~OPTION_EARLY_PIPE;
1751
1752 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1753 return checks;
1754 }
1755
1756
1757
1758 /* Callback for emitting a BDAT data chunk header.
1759
1760 If given a nonzero size, first flush any buffered SMTP commands
1761 then emit the command.
1762
1763 Reap previous SMTP command responses if requested, and always reap
1764 the response from a previous BDAT command.
1765
1766 Args:
1767 tctx transport context
1768 chunk_size value for SMTP BDAT command
1769 flags
1770 tc_chunk_last add LAST option to SMTP BDAT command
1771 tc_reap_prev reap response to previous SMTP commands
1772
1773 Returns:
1774 OK or ERROR
1775 DEFER TLS error on first read (EHLO-resp); errno set
1776 */
1777
1778 static int
1779 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1780 unsigned flags)
1781 {
1782 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1783 smtp_context * sx = tctx->smtp_context;
1784 int cmd_count = 0;
1785 int prev_cmd_count;
1786
1787 /* Write SMTP chunk header command. If not reaping responses, note that
1788 there may be more writes (like, the chunk data) done soon. */
1789
1790 if (chunk_size > 0)
1791 {
1792 #ifndef DISABLE_PIPE_CONNECT
1793 BOOL new_conn = !!(sx->outblock.conn_args);
1794 #endif
1795 if((cmd_count = smtp_write_command(sx,
1796 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1797 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1798 ) < 0) return ERROR;
1799 if (flags & tc_chunk_last)
1800 data_command = string_copy(big_buffer); /* Save for later error message */
1801 #ifndef DISABLE_PIPE_CONNECT
1802 /* That command write could have been the one that made the connection.
1803 Copy the fd from the client conn ctx (smtp transport specific) to the
1804 generic transport ctx. */
1805
1806 if (new_conn)
1807 tctx->u.fd = sx->outblock.cctx->sock;
1808 #endif
1809 }
1810
1811 prev_cmd_count = cmd_count += sx->cmd_count;
1812
1813 /* Reap responses for any previous, but not one we just emitted */
1814
1815 if (chunk_size > 0)
1816 prev_cmd_count--;
1817 if (sx->pending_BDAT)
1818 prev_cmd_count--;
1819
1820 if (flags & tc_reap_prev && prev_cmd_count > 0)
1821 {
1822 DEBUG(D_transport) debug_printf("look for %d responses"
1823 " for previous pipelined cmds\n", prev_cmd_count);
1824
1825 switch(sync_responses(sx, prev_cmd_count, 0))
1826 {
1827 case 1: /* 2xx (only) => OK */
1828 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1829 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1830 case 0: break; /* No 2xx or 5xx, but no probs */
1831
1832 case -5: errno = ERRNO_TLSFAILURE;
1833 return DEFER;
1834 #ifndef DISABLE_PIPE_CONNECT
1835 case -4: /* non-2xx for pipelined banner or EHLO */
1836 #endif
1837 case -1: /* Timeout on RCPT */
1838 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1839 }
1840 cmd_count = 1;
1841 if (!sx->pending_BDAT)
1842 pipelining_active = FALSE;
1843 }
1844
1845 /* Reap response for an outstanding BDAT */
1846
1847 if (sx->pending_BDAT)
1848 {
1849 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1850
1851 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1852 ob->command_timeout))
1853 {
1854 if (errno == 0 && sx->buffer[0] == '4')
1855 {
1856 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1857 sx->addrlist->more_errno |=
1858 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1859 }
1860 return ERROR;
1861 }
1862 cmd_count--;
1863 sx->pending_BDAT = FALSE;
1864 pipelining_active = FALSE;
1865 }
1866 else if (chunk_size > 0)
1867 sx->pending_BDAT = TRUE;
1868
1869
1870 sx->cmd_count = cmd_count;
1871 return OK;
1872 }
1873
1874
1875
1876
1877
1878 /*************************************************
1879 * Make connection for given message *
1880 *************************************************/
1881
1882 /*
1883 Arguments:
1884 ctx connection context
1885 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1886 a second attempt after TLS initialization fails
1887
1888 Returns: OK - the connection was made and the delivery attempted;
1889 fd is set in the conn context, tls_out set up.
1890 DEFER - the connection could not be made, or something failed
1891 while setting up the SMTP session, or there was a
1892 non-message-specific error, such as a timeout.
1893 ERROR - helo_data or add_headers or authenticated_sender is
1894 specified for this transport, and the string failed
1895 to expand
1896 */
1897 int
1898 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1899 {
1900 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1901 BOOL pass_message = FALSE;
1902 uschar * message = NULL;
1903 int yield = OK;
1904 #ifndef DISABLE_TLS
1905 uschar * tls_errstr;
1906 #endif
1907
1908 sx->conn_args.ob = ob;
1909
1910 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1911 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1912 /* sx->ok = FALSE; */
1913 sx->send_rset = TRUE;
1914 sx->send_quit = TRUE;
1915 sx->setting_up = TRUE;
1916 sx->esmtp = TRUE;
1917 /* sx->esmtp_sent = FALSE; */
1918 #ifdef SUPPORT_I18N
1919 /* sx->utf8_needed = FALSE; */
1920 #endif
1921 sx->dsn_all_lasthop = TRUE;
1922 #ifdef SUPPORT_DANE
1923 /* sx->conn_args.dane = FALSE; */
1924 sx->dane_required =
1925 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1926 #endif
1927 #ifndef DISABLE_PIPE_CONNECT
1928 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1929 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1930 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1931 #endif
1932
1933 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1934 /* sx->peer_offered = 0; */
1935 /* sx->avoid_option = 0; */
1936 sx->igquotstr = US"";
1937 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1938 #ifdef EXPERIMENTAL_DSN_INFO
1939 /* sx->smtp_greeting = NULL; */
1940 /* sx->helo_response = NULL; */
1941 #endif
1942
1943 smtp_command = US"initial connection";
1944 /* sx->buffer[0] = '\0'; */
1945
1946 /* Set up the buffer for reading SMTP response packets. */
1947
1948 sx->inblock.buffer = sx->inbuffer;
1949 sx->inblock.buffersize = sizeof(sx->inbuffer);
1950 sx->inblock.ptr = sx->inbuffer;
1951 sx->inblock.ptrend = sx->inbuffer;
1952
1953 /* Set up the buffer for holding SMTP commands while pipelining */
1954
1955 sx->outblock.buffer = sx->outbuffer;
1956 sx->outblock.buffersize = sizeof(sx->outbuffer);
1957 sx->outblock.ptr = sx->outbuffer;
1958 /* sx->outblock.cmd_count = 0; */
1959 /* sx->outblock.authenticating = FALSE; */
1960 /* sx->outblock.conn_args = NULL; */
1961
1962 /* Reset the parameters of a TLS session. */
1963
1964 tls_out.bits = 0;
1965 tls_out.cipher = NULL; /* the one we may use for this transport */
1966 tls_out.ourcert = NULL;
1967 tls_out.peercert = NULL;
1968 tls_out.peerdn = NULL;
1969 #ifdef USE_OPENSSL
1970 tls_out.sni = NULL;
1971 #endif
1972 tls_out.ocsp = OCSP_NOT_REQ;
1973 #ifdef EXPERIMENTAL_TLS_RESUME
1974 tls_out.resumption = 0;
1975 #endif
1976 tls_out.ver = NULL;
1977
1978 /* Flip the legacy TLS-related variables over to the outbound set in case
1979 they're used in the context of the transport. Don't bother resetting
1980 afterward (when being used by a transport) as we're in a subprocess.
1981 For verify, unflipped once the callout is dealt with */
1982
1983 tls_modify_variables(&tls_out);
1984
1985 #ifdef DISABLE_TLS
1986 if (sx->smtps)
1987 {
1988 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1989 DEFER, FALSE, &sx->delivery_start);
1990 return ERROR;
1991 }
1992 #endif
1993
1994 /* Make a connection to the host if this isn't a continued delivery, and handle
1995 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1996 specially so they can be identified for retries. */
1997
1998 if (!continue_hostname)
1999 {
2000 if (sx->verify)
2001 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2002
2003 /* Get the actual port the connection will use, into sx->conn_args.host */
2004
2005 smtp_port_for_connect(sx->conn_args.host, sx->port);
2006
2007 #ifdef SUPPORT_DANE
2008 /* Do TLSA lookup for DANE */
2009 {
2010 tls_out.dane_verified = FALSE;
2011 tls_out.tlsa_usage = 0;
2012
2013 if (sx->conn_args.host->dnssec == DS_YES)
2014 {
2015 int rc;
2016 if( sx->dane_required
2017 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2018 )
2019 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2020 {
2021 case OK: sx->conn_args.dane = TRUE;
2022 ob->tls_tempfail_tryclear = FALSE;
2023 break;
2024 case FAIL_FORCED: break;
2025 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2026 string_sprintf("DANE error: tlsa lookup %s",
2027 rc_to_string(rc)),
2028 rc, FALSE, &sx->delivery_start);
2029 # ifndef DISABLE_EVENT
2030 (void) event_raise(sx->conn_args.tblock->event_action,
2031 US"dane:fail", sx->dane_required
2032 ? US"dane-required" : US"dnssec-invalid");
2033 # endif
2034 return rc;
2035 }
2036 }
2037 else if (sx->dane_required)
2038 {
2039 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2040 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2041 FAIL, FALSE, &sx->delivery_start);
2042 # ifndef DISABLE_EVENT
2043 (void) event_raise(sx->conn_args.tblock->event_action,
2044 US"dane:fail", US"dane-required");
2045 # endif
2046 return FAIL;
2047 }
2048 }
2049 #endif /*DANE*/
2050
2051 /* Make the TCP connection */
2052
2053 sx->cctx.tls_ctx = NULL;
2054 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2055 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2056
2057 #ifndef DISABLE_PIPE_CONNECT
2058 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2059 sx->conn_args.host) == OK)
2060
2061 /* We don't find out the local ip address until the connect, so if
2062 the helo string might use it avoid doing early-pipelining. */
2063
2064 if ( !sx->helo_data
2065 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2066 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2067 )
2068 {
2069 sx->early_pipe_ok = TRUE;
2070 if ( read_ehlo_cache_entry(sx)
2071 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2072 {
2073 DEBUG(D_transport)
2074 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2075 sx->early_pipe_active = TRUE;
2076 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2077 }
2078 }
2079 else DEBUG(D_transport)
2080 debug_printf("helo needs $sending_ip_address\n");
2081
2082 PIPE_CONNECT_RETRY:
2083 if (sx->early_pipe_active)
2084 sx->outblock.conn_args = &sx->conn_args;
2085 else
2086 #endif
2087 {
2088 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2089 {
2090 set_errno_nohost(sx->addrlist,
2091 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2092 sx->verify ? US strerror(errno) : NULL,
2093 DEFER, FALSE, &sx->delivery_start);
2094 sx->send_quit = FALSE;
2095 return DEFER;
2096 }
2097 }
2098 /* Expand the greeting message while waiting for the initial response. (Makes
2099 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2100 delayed till here so that $sending_interface and $sending_port are set. */
2101 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2102 will be? Somehow I doubt it. */
2103
2104 if (sx->helo_data)
2105 if (!(sx->helo_data = expand_string(sx->helo_data)))
2106 if (sx->verify)
2107 log_write(0, LOG_MAIN|LOG_PANIC,
2108 "<%s>: failed to expand transport's helo_data value for callout: %s",
2109 sx->addrlist->address, expand_string_message);
2110
2111 #ifdef SUPPORT_I18N
2112 if (sx->helo_data)
2113 {
2114 expand_string_message = NULL;
2115 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2116 &expand_string_message)),
2117 expand_string_message)
2118 if (sx->verify)
2119 log_write(0, LOG_MAIN|LOG_PANIC,
2120 "<%s>: failed to expand transport's helo_data value for callout: %s",
2121 sx->addrlist->address, expand_string_message);
2122 else
2123 sx->helo_data = NULL;
2124 }
2125 #endif
2126
2127 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2128 is nevertheless a reasonably clean way of programming this kind of logic,
2129 where you want to escape on any error. */
2130
2131 if (!sx->smtps)
2132 {
2133 #ifndef DISABLE_PIPE_CONNECT
2134 if (sx->early_pipe_active)
2135 {
2136 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2137 sx->outblock.cmd_count = 1;
2138 }
2139 else
2140 #endif
2141 {
2142 #ifdef TCP_QUICKACK
2143 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2144 sizeof(off));
2145 #endif
2146 if (!smtp_reap_banner(sx))
2147 goto RESPONSE_FAILED;
2148 }
2149
2150 #ifndef DISABLE_EVENT
2151 {
2152 uschar * s;
2153 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2154 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2155 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2156 if (s)
2157 {
2158 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2159 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2160 DEFER, FALSE, &sx->delivery_start);
2161 yield = DEFER;
2162 goto SEND_QUIT;
2163 }
2164 }
2165 #endif
2166
2167 /* Now check if the helo_data expansion went well, and sign off cleanly if
2168 it didn't. */
2169
2170 if (!sx->helo_data)
2171 {
2172 message = string_sprintf("failed to expand helo_data: %s",
2173 expand_string_message);
2174 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2175 yield = DEFER;
2176 goto SEND_QUIT;
2177 }
2178 }
2179
2180 /** Debugging without sending a message
2181 sx->addrlist->transport_return = DEFER;
2182 goto SEND_QUIT;
2183 **/
2184
2185 /* Errors that occur after this point follow an SMTP command, which is
2186 left in big_buffer by smtp_write_command() for use in error messages. */
2187
2188 smtp_command = big_buffer;
2189
2190 /* Tell the remote who we are...
2191
2192 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2193 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2194 greeting is of this form. The assumption was that the far end supports it
2195 properly... but experience shows that there are some that give 5xx responses,
2196 even though the banner includes "ESMTP" (there's a bloody-minded one that
2197 says "ESMTP not spoken here"). Cope with that case.
2198
2199 September 2000: Time has passed, and it seems reasonable now to always send
2200 EHLO at the start. It is also convenient to make the change while installing
2201 the TLS stuff.
2202
2203 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2204 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2205 would be no way to send out the mails, so there is now a host list
2206 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2207 PIPELINING problem as well. Maybe it can also be useful to cure other
2208 problems with broken servers.
2209
2210 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2211 Then somebody tried it with a Microsoft mailer... It seems that all other
2212 mailers use upper case for some reason (the RFC is quite clear about case
2213 independence) so, for peace of mind, I gave in. */
2214
2215 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2216
2217 /* Alas; be careful, since this goto is not an error-out, so conceivably
2218 we might set data between here and the target which we assume to exist
2219 and be usable. I can see this coming back to bite us. */
2220 #ifndef DISABLE_TLS
2221 if (sx->smtps)
2222 {
2223 smtp_peer_options |= OPTION_TLS;
2224 suppress_tls = FALSE;
2225 ob->tls_tempfail_tryclear = FALSE;
2226 smtp_command = US"SSL-on-connect";
2227 goto TLS_NEGOTIATE;
2228 }
2229 #endif
2230
2231 if (sx->esmtp)
2232 {
2233 if (smtp_write_command(sx,
2234 #ifndef DISABLE_PIPE_CONNECT
2235 sx->early_pipe_active ? SCMD_BUFFER :
2236 #endif
2237 SCMD_FLUSH,
2238 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2239 goto SEND_FAILED;
2240 sx->esmtp_sent = TRUE;
2241
2242 #ifndef DISABLE_PIPE_CONNECT
2243 if (sx->early_pipe_active)
2244 {
2245 sx->pending_EHLO = TRUE;
2246
2247 /* If we have too many authenticators to handle and might need to AUTH
2248 for this transport, pipeline no further as we will need the
2249 list of auth methods offered. Reap the banner and EHLO. */
2250
2251 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2252 && f.smtp_in_early_pipe_no_auth)
2253 {
2254 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2255 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2256 goto SEND_FAILED;
2257 if (sync_responses(sx, 2, 0) != 0)
2258 {
2259 HDEBUG(D_transport)
2260 debug_printf("failed reaping pipelined cmd responses\n");
2261 goto RESPONSE_FAILED;
2262 }
2263 sx->early_pipe_active = FALSE;
2264 }
2265 }
2266 else
2267 #endif
2268 if (!smtp_reap_ehlo(sx))
2269 goto RESPONSE_FAILED;
2270 }
2271 else
2272 DEBUG(D_transport)
2273 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2274
2275 #ifndef DISABLE_PIPE_CONNECT
2276 if (!sx->early_pipe_active)
2277 #endif
2278 if (!sx->esmtp)
2279 {
2280 BOOL good_response;
2281 int n = sizeof(sx->buffer);
2282 uschar * rsp = sx->buffer;
2283
2284 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2285 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2286
2287 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2288 goto SEND_FAILED;
2289 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2290 #ifdef EXPERIMENTAL_DSN_INFO
2291 sx->helo_response = string_copy(rsp);
2292 #endif
2293 if (!good_response)
2294 {
2295 /* Handle special logging for a closed connection after HELO
2296 when had previously sent EHLO */
2297
2298 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2299 {
2300 errno = ERRNO_SMTPCLOSED;
2301 goto EHLOHELO_FAILED;
2302 }
2303 memmove(sx->buffer, rsp, Ustrlen(rsp));
2304 goto RESPONSE_FAILED;
2305 }
2306 }
2307
2308 if (sx->esmtp || sx->lmtp)
2309 {
2310 #ifndef DISABLE_PIPE_CONNECT
2311 if (!sx->early_pipe_active)
2312 #endif
2313 {
2314 sx->peer_offered = ehlo_response(sx->buffer,
2315 OPTION_TLS /* others checked later */
2316 #ifndef DISABLE_PIPE_CONNECT
2317 | (sx->early_pipe_ok
2318 ? OPTION_IGNQ
2319 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2320 #ifdef SUPPORT_I18N
2321 | OPTION_UTF8
2322 #endif
2323 | OPTION_EARLY_PIPE
2324 : 0
2325 )
2326 #endif
2327 );
2328 #ifndef DISABLE_PIPE_CONNECT
2329 if (sx->early_pipe_ok)
2330 {
2331 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2332
2333 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2334 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2335 {
2336 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2337 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2338 write_ehlo_cache_entry(sx);
2339 }
2340 }
2341 #endif
2342 }
2343
2344 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2345
2346 #ifndef DISABLE_TLS
2347 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2348 #endif
2349 }
2350 }
2351
2352 /* For continuing deliveries down the same channel, having re-exec'd the socket
2353 is the standard input; for a socket held open from verify it is recorded
2354 in the cutthrough context block. Either way we don't need to redo EHLO here
2355 (but may need to do so for TLS - see below).
2356 Set up the pointer to where subsequent commands will be left, for
2357 error messages. Note that smtp_peer_options will have been
2358 set from the command line if they were set in the process that passed the
2359 connection on. */
2360
2361 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2362 as the continue goes via transport_pass_socket() and doublefork and exec.
2363 It does not wait. Unclear how we keep separate host's responses
2364 separate - we could match up by host ip+port as a bodge. */
2365
2366 else
2367 {
2368 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2369 {
2370 sx->cctx = cutthrough.cctx;
2371 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2372 }
2373 else
2374 {
2375 sx->cctx.sock = 0; /* stdin */
2376 sx->cctx.tls_ctx = NULL;
2377 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2378 }
2379 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2380 smtp_command = big_buffer;
2381 sx->peer_offered = smtp_peer_options;
2382 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2383
2384 /* For a continued connection with TLS being proxied for us, or a
2385 held-open verify connection with TLS, nothing more to do. */
2386
2387 if ( continue_proxy_cipher
2388 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2389 && cutthrough.is_tls)
2390 )
2391 {
2392 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2393 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2394 continue_proxy_cipher ? "proxied" : "verify conn with");
2395 return OK;
2396 }
2397 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2398 }
2399
2400 /* If TLS is available on this connection, whether continued or not, attempt to
2401 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2402 send another EHLO - the server may give a different answer in secure mode. We
2403 use a separate buffer for reading the response to STARTTLS so that if it is
2404 negative, the original EHLO data is available for subsequent analysis, should
2405 the client not be required to use TLS. If the response is bad, copy the buffer
2406 for error analysis. */
2407
2408 #ifndef DISABLE_TLS
2409 if ( smtp_peer_options & OPTION_TLS
2410 && !suppress_tls
2411 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2412 && ( !sx->verify
2413 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2414 ) )
2415 {
2416 uschar buffer2[4096];
2417
2418 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2419 goto SEND_FAILED;
2420
2421 #ifndef DISABLE_PIPE_CONNECT
2422 /* If doing early-pipelining reap the banner and EHLO-response but leave
2423 the response for the STARTTLS we just sent alone. */
2424
2425 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2426 {
2427 HDEBUG(D_transport)
2428 debug_printf("failed reaping pipelined cmd responses\n");
2429 close(sx->cctx.sock);
2430 sx->cctx.sock = -1;
2431 sx->early_pipe_active = FALSE;
2432 goto PIPE_CONNECT_RETRY;
2433 }
2434 #endif
2435
2436 /* If there is an I/O error, transmission of this message is deferred. If
2437 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2438 false, we also defer. However, if there is a temporary rejection of STARTTLS
2439 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2440 STARTTLS, we carry on. This means we will try to send the message in clear,
2441 unless the host is in hosts_require_tls (tested below). */
2442
2443 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2444 {
2445 if ( errno != 0
2446 || buffer2[0] == 0
2447 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2448 )
2449 {
2450 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2451 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2452 goto RESPONSE_FAILED;
2453 }
2454 }
2455
2456 /* STARTTLS accepted: try to negotiate a TLS session. */
2457
2458 else
2459 TLS_NEGOTIATE:
2460 {
2461 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2462 {
2463 /* TLS negotiation failed; give an error. From outside, this function may
2464 be called again to try in clear on a new connection, if the options permit
2465 it for this host. */
2466 #ifdef USE_GNUTLS
2467 GNUTLS_CONN_FAILED:
2468 #endif
2469 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2470
2471 # ifdef SUPPORT_DANE
2472 if (sx->conn_args.dane)
2473 {
2474 log_write(0, LOG_MAIN,
2475 "DANE attempt failed; TLS connection to %s [%s]: %s",
2476 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2477 # ifndef DISABLE_EVENT
2478 (void) event_raise(sx->conn_args.tblock->event_action,
2479 US"dane:fail", US"validation-failure"); /* could do with better detail */
2480 # endif
2481 }
2482 # endif
2483
2484 errno = ERRNO_TLSFAILURE;
2485 message = string_sprintf("TLS session: %s", tls_errstr);
2486 sx->send_quit = FALSE;
2487 goto TLS_FAILED;
2488 }
2489
2490 /* TLS session is set up */
2491
2492 smtp_peer_options_wrap = smtp_peer_options;
2493 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2494 if (addr->transport_return == PENDING_DEFER)
2495 {
2496 addr->cipher = tls_out.cipher;
2497 addr->ourcert = tls_out.ourcert;
2498 addr->peercert = tls_out.peercert;
2499 addr->peerdn = tls_out.peerdn;
2500 addr->ocsp = tls_out.ocsp;
2501 addr->tlsver = tls_out.ver;
2502 }
2503 }
2504 }
2505
2506 /* if smtps, we'll have smtp_command set to something else; always safe to
2507 reset it here. */
2508 smtp_command = big_buffer;
2509
2510 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2511 helo_data is null, we are dealing with a connection that was passed from
2512 another process, and so we won't have expanded helo_data above. We have to
2513 expand it here. $sending_ip_address and $sending_port are set up right at the
2514 start of the Exim process (in exim.c). */
2515
2516 if (tls_out.active.sock >= 0)
2517 {
2518 uschar * greeting_cmd;
2519
2520 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2521 {
2522 uschar *message = string_sprintf("failed to expand helo_data: %s",
2523 expand_string_message);
2524 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2525 yield = DEFER;
2526 goto SEND_QUIT;
2527 }
2528
2529 #ifndef DISABLE_PIPE_CONNECT
2530 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2531 We're unlikely to get the group sent and delivered before the server sends its
2532 banner, but it's still worth sending as a group.
2533 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2534 the reverse. */
2535
2536 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2537 {
2538 sx->peer_offered = sx->ehlo_resp.crypted_features;
2539 if ((sx->early_pipe_active =
2540 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2541 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2542 }
2543 #endif
2544
2545 /* For SMTPS we need to wait for the initial OK response. */
2546 if (sx->smtps)
2547 #ifndef DISABLE_PIPE_CONNECT
2548 if (sx->early_pipe_active)
2549 {
2550 sx->pending_BANNER = TRUE;
2551 sx->outblock.cmd_count = 1;
2552 }
2553 else
2554 #endif
2555 if (!smtp_reap_banner(sx))
2556 goto RESPONSE_FAILED;
2557
2558 if (sx->lmtp)
2559 greeting_cmd = US"LHLO";
2560 else if (sx->esmtp)
2561 greeting_cmd = US"EHLO";
2562 else
2563 {
2564 greeting_cmd = US"HELO";
2565 DEBUG(D_transport)
2566 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2567 }
2568
2569 if (smtp_write_command(sx,
2570 #ifndef DISABLE_PIPE_CONNECT
2571 sx->early_pipe_active ? SCMD_BUFFER :
2572 #endif
2573 SCMD_FLUSH,
2574 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2575 goto SEND_FAILED;
2576
2577 #ifndef DISABLE_PIPE_CONNECT
2578 if (sx->early_pipe_active)
2579 sx->pending_EHLO = TRUE;
2580 else
2581 #endif
2582 {
2583 if (!smtp_reap_ehlo(sx))
2584 #ifdef USE_GNUTLS
2585 {
2586 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2587 cert late, under TLS1.3 - which means here; the first time we try to
2588 receive crypted data. Treat it as if it was a connect-time failure.
2589 See also the early-pipe equivalent... which will be hard; every call
2590 to sync_responses will need to check the result.
2591 It would be nicer to have GnuTLS check the cert during the handshake.
2592 Can it do that, with all the flexibility we need? */
2593
2594 tls_errstr = US"error on first read";
2595 goto GNUTLS_CONN_FAILED;
2596 }
2597 #else
2598 goto RESPONSE_FAILED;
2599 #endif
2600 smtp_peer_options = 0;
2601 }
2602 }
2603
2604 /* If the host is required to use a secure channel, ensure that we
2605 have one. */
2606
2607 else if ( sx->smtps
2608 # ifdef SUPPORT_DANE
2609 || sx->conn_args.dane
2610 # endif
2611 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2612 )
2613 {
2614 errno = ERRNO_TLSREQUIRED;
2615 message = string_sprintf("a TLS session is required, but %s",
2616 smtp_peer_options & OPTION_TLS
2617 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2618 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2619 if (sx->conn_args.dane)
2620 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2621 smtp_peer_options & OPTION_TLS
2622 ? US"validation-failure" /* could do with better detail */
2623 : US"starttls-not-supported");
2624 # endif
2625 goto TLS_FAILED;
2626 }
2627 #endif /*DISABLE_TLS*/
2628
2629 /* If TLS is active, we have just started it up and re-done the EHLO command,
2630 so its response needs to be analyzed. If TLS is not active and this is a
2631 continued session down a previously-used socket, we haven't just done EHLO, so
2632 we skip this. */
2633
2634 if (continue_hostname == NULL
2635 #ifndef DISABLE_TLS
2636 || tls_out.active.sock >= 0
2637 #endif
2638 )
2639 {
2640 if (sx->esmtp || sx->lmtp)
2641 {
2642 #ifndef DISABLE_PIPE_CONNECT
2643 if (!sx->early_pipe_active)
2644 #endif
2645 {
2646 sx->peer_offered = ehlo_response(sx->buffer,
2647 0 /* no TLS */
2648 #ifndef DISABLE_PIPE_CONNECT
2649 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2650 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2651 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2652 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2653
2654 #else
2655
2656 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2657 | OPTION_CHUNKING
2658 | OPTION_PRDR
2659 # ifdef SUPPORT_I18N
2660 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2661 /*XXX if we hand peercaps on to continued-conn processes,
2662 must not depend on this addr */
2663 # endif
2664 | OPTION_DSN
2665 | OPTION_PIPE
2666 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2667 #endif
2668 );
2669 #ifndef DISABLE_PIPE_CONNECT
2670 if (tls_out.active.sock >= 0)
2671 sx->ehlo_resp.crypted_features = sx->peer_offered;
2672 #endif
2673 }
2674
2675 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2676 lmtp_ignore_quota option was set. */
2677
2678 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2679
2680 /* If the response to EHLO specified support for the SIZE parameter, note
2681 this, provided size_addition is non-negative. */
2682
2683 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2684
2685 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2686 the current host, esmtp will be false, so PIPELINING can never be used. If
2687 the current host matches hosts_avoid_pipelining, don't do it. */
2688
2689 if ( sx->peer_offered & OPTION_PIPE
2690 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2691 smtp_peer_options |= OPTION_PIPE;
2692
2693 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2694 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2695
2696 if ( sx->peer_offered & OPTION_CHUNKING
2697 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2698 sx->peer_offered &= ~OPTION_CHUNKING;
2699
2700 if (sx->peer_offered & OPTION_CHUNKING)
2701 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2702
2703 #ifndef DISABLE_PRDR
2704 if ( sx->peer_offered & OPTION_PRDR
2705 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2706 sx->peer_offered &= ~OPTION_PRDR;
2707
2708 if (sx->peer_offered & OPTION_PRDR)
2709 DEBUG(D_transport) debug_printf("PRDR usable\n");
2710 #endif
2711
2712 /* Note if the server supports DSN */
2713 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2714 DEBUG(D_transport) debug_printf("%susing DSN\n",
2715 sx->peer_offered & OPTION_DSN ? "" : "not ");
2716
2717 #ifndef DISABLE_PIPE_CONNECT
2718 if ( sx->early_pipe_ok
2719 && !sx->early_pipe_active
2720 && tls_out.active.sock >= 0
2721 && smtp_peer_options & OPTION_PIPE
2722 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2723 & OPTION_EARLY_PIPE)
2724 {
2725 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2726 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2727 write_ehlo_cache_entry(sx);
2728 }
2729 #endif
2730
2731 /* Note if the response to EHLO specifies support for the AUTH extension.
2732 If it has, check that this host is one we want to authenticate to, and do
2733 the business. The host name and address must be available when the
2734 authenticator's client driver is running. */
2735
2736 switch (yield = smtp_auth(sx))
2737 {
2738 default: goto SEND_QUIT;
2739 case OK: break;
2740 case FAIL_SEND: goto SEND_FAILED;
2741 case FAIL: goto RESPONSE_FAILED;
2742 }
2743 }
2744 }
2745 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2746
2747 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2748 message-specific. */
2749
2750 sx->setting_up = FALSE;
2751
2752 #ifdef SUPPORT_I18N
2753 if (sx->addrlist->prop.utf8_msg)
2754 {
2755 uschar * s;
2756
2757 /* If the transport sets a downconversion mode it overrides any set by ACL
2758 for the message. */
2759
2760 if ((s = ob->utf8_downconvert))
2761 {
2762 if (!(s = expand_string(s)))
2763 {
2764 message = string_sprintf("failed to expand utf8_downconvert: %s",
2765 expand_string_message);
2766 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2767 yield = DEFER;
2768 goto SEND_QUIT;
2769 }
2770 switch (*s)
2771 {
2772 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2773 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2774 break;
2775 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2776 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2777 break;
2778 case '-': if (s[1] == '1')
2779 {
2780 sx->addrlist->prop.utf8_downcvt = FALSE;
2781 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2782 }
2783 break;
2784 }
2785 }
2786
2787 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2788 && !sx->addrlist->prop.utf8_downcvt_maybe;
2789 DEBUG(D_transport) if (!sx->utf8_needed)
2790 debug_printf("utf8: %s downconvert\n",
2791 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2792 }
2793
2794 /* If this is an international message we need the host to speak SMTPUTF8 */
2795 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2796 {
2797 errno = ERRNO_UTF8_FWD;
2798 goto RESPONSE_FAILED;
2799 }
2800 #endif /*SUPPORT_I18N*/
2801
2802 return OK;
2803
2804
2805 {
2806 int code;
2807
2808 RESPONSE_FAILED:
2809 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2810 {
2811 /* There is a testing facility for simulating a connection timeout, as I
2812 can't think of any other way of doing this. It converts a connection
2813 refused into a timeout if the timeout is set to 999999. This is done for
2814 a 3whs connection in ip_connect(), but a TFO connection does not error
2815 there - instead it gets ECONNREFUSED on the first data read. Tracking
2816 that a TFO really was done is too hard, or we would set a
2817 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2818 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2819 cmd-timeout. */
2820
2821 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2822 errno = ETIMEDOUT;
2823 set_errno_nohost(sx->addrlist,
2824 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2825 sx->verify ? US strerror(errno) : NULL,
2826 DEFER, FALSE, &sx->delivery_start);
2827 sx->send_quit = FALSE;
2828 return DEFER;
2829 }
2830
2831 /* really an error on an SMTP read */
2832 message = NULL;
2833 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2834 sx->buffer, &code, &message, &pass_message);
2835 yield = DEFER;
2836 goto FAILED;
2837
2838 SEND_FAILED:
2839 code = '4';
2840 message = US string_sprintf("send() to %s [%s] failed: %s",
2841 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2842 sx->send_quit = FALSE;
2843 yield = DEFER;
2844 goto FAILED;
2845
2846 EHLOHELO_FAILED:
2847 code = '4';
2848 message = string_sprintf("Remote host closed connection in response to %s"
2849 " (EHLO response was: %s)", smtp_command, sx->buffer);
2850 sx->send_quit = FALSE;
2851 yield = DEFER;
2852 goto FAILED;
2853
2854 /* This label is jumped to directly when a TLS negotiation has failed,
2855 or was not done for a host for which it is required. Values will be set
2856 in message and errno, and setting_up will always be true. Treat as
2857 a temporary error. */
2858
2859 #ifndef DISABLE_TLS
2860 TLS_FAILED:
2861 code = '4', yield = DEFER;
2862 goto FAILED;
2863 #endif
2864
2865 /* The failure happened while setting up the call; see if the failure was
2866 a 5xx response (this will either be on connection, or following HELO - a 5xx
2867 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2868 fail all addresses, as this host is never going to accept them. For other
2869 errors during setting up (timeouts or whatever), defer all addresses, and
2870 yield DEFER, so that the host is not tried again for a while.
2871
2872 XXX This peeking for another host feels like a layering violation. We want
2873 to note the host as unusable, but down here we shouldn't know if this was
2874 the last host to try for the addr(list). Perhaps the upper layer should be
2875 the one to do set_errno() ? The problem is that currently the addr is where
2876 errno etc. are stashed, but until we run out of hosts to try the errors are
2877 host-specific. Maybe we should enhance the host_item definition? */
2878
2879 FAILED:
2880 sx->ok = FALSE; /* For when reached by GOTO */
2881 set_errno(sx->addrlist, errno, message,
2882 sx->conn_args.host->next
2883 ? DEFER
2884 : code == '5'
2885 #ifdef SUPPORT_I18N
2886 || errno == ERRNO_UTF8_FWD
2887 #endif
2888 ? FAIL : DEFER,
2889 pass_message,
2890 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2891 #ifdef EXPERIMENTAL_DSN_INFO
2892 sx->smtp_greeting, sx->helo_response,
2893 #endif
2894 &sx->delivery_start);
2895 }
2896
2897
2898 SEND_QUIT:
2899
2900 if (sx->send_quit)
2901 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2902
2903 #ifndef DISABLE_TLS
2904 if (sx->cctx.tls_ctx)
2905 {
2906 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2907 sx->cctx.tls_ctx = NULL;
2908 }
2909 #endif
2910
2911 /* Close the socket, and return the appropriate value, first setting
2912 works because the NULL setting is passed back to the calling process, and
2913 remote_max_parallel is forced to 1 when delivering over an existing connection,
2914 */
2915
2916 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2917 if (sx->send_quit)
2918 {
2919 shutdown(sx->cctx.sock, SHUT_WR);
2920 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2921 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2922 i--; /* drain socket */
2923 sx->send_quit = FALSE;
2924 }
2925 (void)close(sx->cctx.sock);
2926 sx->cctx.sock = -1;
2927
2928 #ifndef DISABLE_EVENT
2929 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2930 #endif
2931
2932 continue_transport = NULL;
2933 continue_hostname = NULL;
2934 return yield;
2935 }
2936
2937
2938
2939
2940 /* Create the string of options that will be appended to the MAIL FROM:
2941 in the connection context buffer */
2942
2943 static int
2944 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2945 {
2946 uschar * p = sx->buffer;
2947 address_item * addr;
2948 int address_count;
2949
2950 *p = 0;
2951
2952 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2953 send it, adding something to the message size to allow for imprecision
2954 and things that get added en route. Exim keeps the number of lines
2955 in a message, so we can give an accurate value for the original message, but we
2956 need some additional to handle added headers. (Double "." characters don't get
2957 included in the count.) */
2958
2959 if ( message_size > 0
2960 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2961 {
2962 /*XXX problem here under spool_files_wireformat?
2963 Or just forget about lines? Or inflate by a fixed proportion? */
2964
2965 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2966 while (*p) p++;
2967 }
2968
2969 #ifndef DISABLE_PRDR
2970 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2971 request that */
2972
2973 sx->prdr_active = FALSE;
2974 if (sx->peer_offered & OPTION_PRDR)
2975 for (address_item * addr = addrlist; addr; addr = addr->next)
2976 if (addr->transport_return == PENDING_DEFER)
2977 {
2978 for (addr = addr->next; addr; addr = addr->next)
2979 if (addr->transport_return == PENDING_DEFER)
2980 { /* at least two recipients to send */
2981 sx->prdr_active = TRUE;
2982 sprintf(CS p, " PRDR"); p += 5;
2983 break;
2984 }
2985 break;
2986 }
2987 #endif
2988
2989 #ifdef SUPPORT_I18N
2990 /* If it supports internationalised messages, and this meesage need that,
2991 request it */
2992
2993 if ( sx->peer_offered & OPTION_UTF8
2994 && addrlist->prop.utf8_msg
2995 && !addrlist->prop.utf8_downcvt
2996 )
2997 Ustrcpy(p, US" SMTPUTF8"), p += 9;
2998 #endif
2999
3000 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3001 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3002 addr && address_count < sx->max_rcpt;
3003 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3004 {
3005 address_count++;
3006 if (!(addr->dsn_flags & rf_dsnlasthop))
3007 {
3008 sx->dsn_all_lasthop = FALSE;
3009 break;
3010 }
3011 }
3012
3013 /* Add any DSN flags to the mail command */
3014
3015 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3016 {
3017 if (dsn_ret == dsn_ret_hdrs)
3018 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3019 else if (dsn_ret == dsn_ret_full)
3020 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3021
3022 if (dsn_envid)
3023 {
3024 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3025 while (*p) p++;
3026 }
3027 }
3028
3029 /* If an authenticated_sender override has been specified for this transport
3030 instance, expand it. If the expansion is forced to fail, and there was already
3031 an authenticated_sender for this message, the original value will be used.
3032 Other expansion failures are serious. An empty result is ignored, but there is
3033 otherwise no check - this feature is expected to be used with LMTP and other
3034 cases where non-standard addresses (e.g. without domains) might be required. */
3035
3036 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3037 }
3038
3039
3040 static void
3041 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3042 {
3043 uschar * p = sx->buffer;
3044 *p = 0;
3045
3046 /* Add any DSN flags to the rcpt command */
3047
3048 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3049 {
3050 if (addr->dsn_flags & rf_dsnflags)
3051 {
3052 BOOL first = TRUE;
3053
3054 Ustrcpy(p, US" NOTIFY=");
3055 while (*p) p++;
3056 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3057 {
3058 if (!first) *p++ = ',';
3059 first = FALSE;
3060 Ustrcpy(p, rf_names[i]);
3061 while (*p) p++;
3062 }
3063 }
3064
3065 if (addr->dsn_orcpt)
3066 {
3067 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3068 addr->dsn_orcpt);
3069 while (*p) p++;
3070 }
3071 }
3072 }
3073
3074
3075
3076 /*
3077 Return:
3078 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3079 -1 MAIL response error
3080 -2 any non-MAIL read i/o error
3081 -3 non-MAIL response timeout
3082 -4 internal error; channel still usable
3083 -5 transmit failed
3084 */
3085
3086 int
3087 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3088 {
3089 address_item * addr;
3090 int address_count, pipe_limit;
3091 int rc;
3092
3093 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3094 {
3095 *yield = ERROR;
3096 return -4;
3097 }
3098
3099 /* From here until we send the DATA command, we can make use of PIPELINING
3100 if the server host supports it. The code has to be able to check the responses
3101 at any point, for when the buffer fills up, so we write it totally generally.
3102 When PIPELINING is off, each command written reports that it has flushed the
3103 buffer. */
3104
3105 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3106
3107 {
3108 uschar * s = sx->from_addr;
3109 #ifdef SUPPORT_I18N
3110 uschar * errstr = NULL;
3111
3112 /* If we must downconvert, do the from-address here. Remember we had to
3113 for the to-addresses (done below), and also (ugly) for re-doing when building
3114 the delivery log line. */
3115
3116 if ( sx->addrlist->prop.utf8_msg
3117 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3118 )
3119 {
3120 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3121 {
3122 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3123 *yield = ERROR;
3124 return -4;
3125 }
3126 setflag(sx->addrlist, af_utf8_downcvt);
3127 }
3128 #endif
3129
3130 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3131 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3132 }
3133
3134 mail_command = string_copy(big_buffer); /* Save for later error message */
3135
3136 switch(rc)
3137 {
3138 case -1: /* Transmission error */
3139 return -5;
3140
3141 case +1: /* Cmd was sent */
3142 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3143 (SOB sx->conn_args.ob)->command_timeout))
3144 {
3145 if (errno == 0 && sx->buffer[0] == '4')
3146 {
3147 errno = ERRNO_MAIL4XX;
3148 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3149 }
3150 return -1;
3151 }
3152 sx->pending_MAIL = FALSE;
3153 break;
3154
3155 /* otherwise zero: command queued for pipeline */
3156 }
3157
3158 /* Pass over all the relevant recipient addresses for this host, which are the
3159 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3160 several before we have to read the responses for those seen so far. This
3161 checking is done by a subroutine because it also needs to be done at the end.
3162 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3163 the next one if not all are sent.
3164
3165 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3166 last address because we want to abort if any recipients have any kind of
3167 problem, temporary or permanent. We know that all recipient addresses will have
3168 the PENDING_DEFER status, because only one attempt is ever made, and we know
3169 that max_rcpt will be large, so all addresses will be done at once.
3170
3171 For verify we flush the pipeline after any (the only) rcpt address. */
3172
3173 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3174 addr && address_count < sx->max_rcpt;
3175 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3176 {
3177 int cmds_sent;
3178 BOOL no_flush;
3179 uschar * rcpt_addr;
3180
3181 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3182 ? dsn_support_yes : dsn_support_no;
3183
3184 address_count++;
3185 if (pipe_limit-- <= 0)
3186 { no_flush = FALSE; pipe_limit = 100; }
3187 else
3188 no_flush = pipelining_active && !sx->verify
3189 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3190
3191 build_rcptcmd_options(sx, addr);
3192
3193 /* Now send the RCPT command, and process outstanding responses when
3194 necessary. After a timeout on RCPT, we just end the function, leaving the
3195 yield as OK, because this error can often mean that there is a problem with
3196 just one address, so we don't want to delay the host. */
3197
3198 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3199
3200 #ifdef SUPPORT_I18N
3201 if ( testflag(sx->addrlist, af_utf8_downcvt)
3202 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3203 )
3204 {
3205 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3206 errno = ERRNO_EXPANDFAIL;
3207 return -5; /*XXX too harsh? */
3208 }
3209 #endif
3210
3211 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3212 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3213
3214 if (cmds_sent < 0) return -5;
3215 if (cmds_sent > 0)
3216 {
3217 switch(sync_responses(sx, cmds_sent, 0))
3218 {
3219 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3220 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3221 break;
3222
3223 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3224 if (!sx->lmtp) /* can't tell about progress yet */
3225 sx->completed_addr = TRUE;
3226 case 0: /* No 2xx or 5xx, but no probs */
3227 /* If any RCPT got a 452 response then next_addr has been updated
3228 for restarting with a new MAIL on the same connection. Send no more
3229 RCPTs for this MAIL. */
3230
3231 if (sx->RCPT_452)
3232 {
3233 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3234 sx->RCPT_452 = FALSE;
3235 /* sx->next_addr has been reset for fast_retry */
3236 return 0;
3237 }
3238 break;
3239
3240 case -1: return -3; /* Timeout on RCPT */
3241 case -2: return -2; /* non-MAIL read i/o error */
3242 default: return -1; /* any MAIL error */
3243
3244 #ifndef DISABLE_PIPE_CONNECT
3245 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3246 case -5: return -1; /* TLS first-read error */
3247 #endif
3248 }
3249 }
3250 } /* Loop for next address */
3251
3252 sx->next_addr = addr;
3253 return 0;
3254 }
3255
3256
3257 #ifndef DISABLE_TLS
3258 /*****************************************************
3259 * Proxy TLS connection for another transport process *
3260 ******************************************************/
3261 /*
3262 Close the unused end of the pipe, fork once more, then use the given buffer
3263 as a staging area, and select on both the given fd and the TLS'd client-fd for
3264 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3265 Do blocking full-size writes, and reads under a timeout. Once both input
3266 channels are closed, exit the process.
3267
3268 Arguments:
3269 ct_ctx tls context
3270 buf space to use for buffering
3271 bufsiz size of buffer
3272 pfd pipe filedescriptor array; [0] is comms to proxied process
3273 timeout per-read timeout, seconds
3274
3275 Does not return.
3276 */
3277
3278 void
3279 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3280 int timeout)
3281 {
3282 fd_set rfds, efds;
3283 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3284 int rc, i;
3285
3286 close(pfd[1]);
3287 if ((rc = exim_fork(US"tls-proxy")))
3288 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3289
3290 set_process_info("proxying TLS connection for continued transport");
3291 FD_ZERO(&rfds);
3292 FD_SET(tls_out.active.sock, &rfds);
3293 FD_SET(pfd[0], &rfds);
3294
3295 for (int fd_bits = 3; fd_bits; )
3296 {
3297 time_t time_left = timeout;
3298 time_t time_start = time(NULL);
3299
3300 /* wait for data */
3301 efds = rfds;
3302 do
3303 {
3304 struct timeval tv = { time_left, 0 };
3305
3306 rc = select(max_fd,
3307 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3308
3309 if (rc < 0 && errno == EINTR)
3310 if ((time_left -= time(NULL) - time_start) > 0) continue;
3311
3312 if (rc <= 0)
3313 {
3314 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3315 goto done;
3316 }
3317
3318 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3319 {
3320 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3321 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3322 goto done;
3323 }
3324 }
3325 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3326
3327 /* handle inbound data */
3328 if (FD_ISSET(tls_out.active.sock, &rfds))
3329 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3330 {
3331 fd_bits &= ~1;
3332 FD_CLR(tls_out.active.sock, &rfds);
3333 shutdown(pfd[0], SHUT_WR);
3334 timeout = 5;
3335 }
3336 else
3337 {
3338 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3339 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3340 }
3341 else if (fd_bits & 1)
3342 FD_SET(tls_out.active.sock, &rfds);
3343
3344 /* handle outbound data */
3345 if (FD_ISSET(pfd[0], &rfds))
3346 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3347 {
3348 fd_bits = 0;
3349 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3350 ct_ctx = NULL;
3351 }
3352 else
3353 {
3354 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3355 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3356 goto done;
3357 }
3358 else if (fd_bits & 2)
3359 FD_SET(pfd[0], &rfds);
3360 }
3361
3362 done:
3363 testharness_pause_ms(100); /* let logging complete */
3364 exim_exit(EXIT_SUCCESS);
3365 }
3366 #endif
3367
3368
3369 /*************************************************
3370 * Deliver address list to given host *
3371 *************************************************/
3372
3373 /* If continue_hostname is not null, we get here only when continuing to
3374 deliver down an existing channel. The channel was passed as the standard
3375 input. TLS is never active on a passed channel; the previous process either
3376 closes it down before passing the connection on, or inserts a TLS-proxy
3377 process and passes on a cleartext conection.
3378
3379 Otherwise, we have to make a connection to the remote host, and do the
3380 initial protocol exchange.
3381
3382 When running as an MUA wrapper, if the sender or any recipient is rejected,
3383 temporarily or permanently, we force failure for all recipients.
3384
3385 Arguments:
3386 addrlist chain of potential addresses to deliver; only those whose
3387 transport_return field is set to PENDING_DEFER are currently
3388 being processed; others should be skipped - they have either
3389 been delivered to an earlier host or IP address, or been
3390 failed by one of them.
3391 host host to deliver to
3392 host_af AF_INET or AF_INET6
3393 defport default TCP/IP port to use if host does not specify, in host
3394 byte order
3395 interface interface to bind to, or NULL
3396 tblock transport instance block
3397 message_defer set TRUE if yield is OK, but all addresses were deferred
3398 because of a non-recipient, non-host failure, that is, a
3399 4xx response to MAIL FROM, DATA, or ".". This is a defer
3400 that is specific to the message.
3401 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3402 a second attempt after TLS initialization fails
3403
3404 Returns: OK - the connection was made and the delivery attempted;
3405 the result for each address is in its data block.
3406 DEFER - the connection could not be made, or something failed
3407 while setting up the SMTP session, or there was a
3408 non-message-specific error, such as a timeout.
3409 ERROR - a filter command is specified for this transport,
3410 and there was a problem setting it up; OR helo_data
3411 or add_headers or authenticated_sender is specified
3412 for this transport, and the string failed to expand
3413
3414 For all non-OK returns the first addr of the list carries the
3415 time taken for the attempt.
3416 */
3417
3418 static int
3419 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3420 uschar *interface, transport_instance *tblock,
3421 BOOL *message_defer, BOOL suppress_tls)
3422 {
3423 smtp_transport_options_block * ob = SOB tblock->options_block;
3424 int yield = OK;
3425 int save_errno;
3426 int rc;
3427
3428 BOOL pass_message = FALSE;
3429 uschar *message = NULL;
3430 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3431 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3432
3433 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3434 *message_defer = FALSE;
3435
3436 memset(sx, 0, sizeof(*sx));
3437 sx->addrlist = addrlist;
3438 sx->conn_args.host = host;
3439 sx->conn_args.host_af = host_af,
3440 sx->port = defport;
3441 sx->conn_args.interface = interface;
3442 sx->helo_data = NULL;
3443 sx->conn_args.tblock = tblock;
3444 /* sx->verify = FALSE; */
3445 gettimeofday(&sx->delivery_start, NULL);
3446 sx->sync_addr = sx->first_addr = addrlist;
3447
3448 /* Get the channel set up ready for a message (MAIL FROM being the next
3449 SMTP command to send */
3450
3451 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3452 {
3453 timesince(&addrlist->delivery_time, &sx->delivery_start);
3454 return rc;
3455 }
3456
3457 /* If there is a filter command specified for this transport, we can now
3458 set it up. This cannot be done until the identity of the host is known. */
3459
3460 if (tblock->filter_command)
3461 {
3462 transport_filter_timeout = tblock->filter_timeout;
3463
3464 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3465 yield ERROR. */
3466
3467 if (!transport_set_up_command(&transport_filter_argv,
3468 tblock->filter_command, TRUE, DEFER, addrlist,
3469 string_sprintf("%.50s transport", tblock->name), NULL))
3470 {
3471 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3472 FALSE, &sx->delivery_start);
3473 yield = ERROR;
3474 goto SEND_QUIT;
3475 }
3476
3477 if ( transport_filter_argv
3478 && *transport_filter_argv
3479 && **transport_filter_argv
3480 && sx->peer_offered & OPTION_CHUNKING
3481 #ifndef DISABLE_DKIM
3482 /* When dkim signing, chunking is handled even with a transport-filter */
3483 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3484 && !ob->dkim.force_bodyhash
3485 #endif
3486 )
3487 {
3488 sx->peer_offered &= ~OPTION_CHUNKING;
3489 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3490 }
3491 }
3492
3493 /* For messages that have more than the maximum number of envelope recipients,
3494 we want to send several transactions down the same SMTP connection. (See
3495 comments in deliver.c as to how this reconciles, heuristically, with
3496 remote_max_parallel.) This optimization was added to Exim after the following
3497 code was already working. The simplest way to put it in without disturbing the
3498 code was to use a goto to jump back to this point when there is another
3499 transaction to handle. */
3500
3501 SEND_MESSAGE:
3502 sx->from_addr = return_path;
3503 sx->sync_addr = sx->first_addr;
3504 sx->ok = FALSE;
3505 sx->send_rset = TRUE;
3506 sx->completed_addr = FALSE;
3507
3508
3509 /* If we are a continued-connection-after-verify the MAIL and RCPT
3510 commands were already sent; do not re-send but do mark the addrs as
3511 having been accepted up to RCPT stage. A traditional cont-conn
3512 always has a sequence number greater than one. */
3513
3514 if (continue_hostname && continue_sequence == 1)
3515 {
3516 /* sx->pending_MAIL = FALSE; */
3517 sx->ok = TRUE;
3518 /* sx->next_addr = NULL; */
3519
3520 for (address_item * addr = addrlist; addr; addr = addr->next)
3521 addr->transport_return = PENDING_OK;
3522 }
3523 else
3524 {
3525 /* Initiate a message transfer. */
3526
3527 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3528 {
3529 case 0: break;
3530 case -1: case -2: goto RESPONSE_FAILED;
3531 case -3: goto END_OFF;
3532 case -4: goto SEND_QUIT;
3533 default: goto SEND_FAILED;
3534 }
3535
3536 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3537 permanently or temporarily. We should have flushed and synced after the last
3538 RCPT. */
3539
3540 if (mua_wrapper)
3541 {
3542 address_item * a;
3543 unsigned cnt;
3544
3545 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3546 if (a->transport_return != PENDING_OK)
3547 {
3548 /*XXX could we find a better errno than 0 here? */
3549 set_errno_nohost(addrlist, 0, a->message, FAIL,
3550 testflag(a, af_pass_message), &sx->delivery_start);
3551 sx->ok = FALSE;
3552 break;
3553 }
3554 }
3555 }
3556
3557 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3558 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3559 have a good recipient buffered up if we are pipelining. We don't want to waste
3560 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3561 are pipelining. The responses are all handled by sync_responses().
3562 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3563 to send is. */
3564
3565 if ( !(sx->peer_offered & OPTION_CHUNKING)
3566 && (sx->ok || (pipelining_active && !mua_wrapper)))
3567 {
3568 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3569
3570 if (count < 0) goto SEND_FAILED;
3571 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3572 {
3573 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3574 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3575 break;
3576
3577 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3578 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3579 case 0: break; /* No 2xx or 5xx, but no probs */
3580
3581 case -1: goto END_OFF; /* Timeout on RCPT */
3582
3583 #ifndef DISABLE_PIPE_CONNECT
3584 case -5: /* TLS first-read error */
3585 case -4: HDEBUG(D_transport)
3586 debug_printf("failed reaping pipelined cmd responses\n");
3587 #endif
3588 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3589 }
3590 pipelining_active = FALSE;
3591 data_command = string_copy(big_buffer); /* Save for later error message */
3592 }
3593
3594 /* If there were no good recipients (but otherwise there have been no
3595 problems), just set ok TRUE, since we have handled address-specific errors
3596 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3597 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3598 well as body. Set the appropriate timeout value to be used for each chunk.
3599 (Haven't been able to make it work using select() for writing yet.) */
3600
3601 if ( !sx->ok
3602 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3603 {
3604 /* Save the first address of the next batch. */
3605 sx->first_addr = sx->next_addr;
3606
3607 sx->ok = TRUE;
3608 }
3609 else
3610 {
3611 transport_ctx tctx = {
3612 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3613 .tblock = tblock,
3614 .addr = addrlist,
3615 .check_string = US".",
3616 .escape_string = US"..", /* Escaping strings */
3617 .options =
3618 topt_use_crlf | topt_escape_headers
3619 | (tblock->body_only ? topt_no_headers : 0)
3620 | (tblock->headers_only ? topt_no_body : 0)
3621 | (tblock->return_path_add ? topt_add_return_path : 0)
3622 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3623 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3624 };
3625
3626 /* If using CHUNKING we need a callback from the generic transport
3627 support to us, for the sending of BDAT smtp commands and the reaping
3628 of responses. The callback needs a whole bunch of state so set up
3629 a transport-context structure to be passed around. */
3630
3631 if (sx->peer_offered & OPTION_CHUNKING)
3632 {
3633 tctx.check_string = tctx.escape_string = NULL;
3634 tctx.options |= topt_use_bdat;
3635 tctx.chunk_cb = smtp_chunk_cmd_callback;
3636 sx->pending_BDAT = FALSE;
3637 sx->good_RCPT = sx->ok;
3638 sx->cmd_count = 0;
3639 tctx.smtp_context = sx;
3640 }
3641 else
3642 tctx.options |= topt_end_dot;
3643
3644 /* Save the first address of the next batch. */
3645 sx->first_addr = sx->next_addr;
3646
3647 /* Responses from CHUNKING commands go in buffer. Otherwise,
3648 there has not been a response. */
3649
3650 sx->buffer[0] = 0;
3651
3652 sigalrm_seen = FALSE;
3653 transport_write_timeout = ob->data_timeout;
3654 smtp_command = US"sending data block"; /* For error messages */
3655 DEBUG(D_transport|D_v)
3656 if (sx->peer_offered & OPTION_CHUNKING)
3657 debug_printf(" will write message using CHUNKING\n");
3658 else
3659 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3660 transport_count = 0;
3661
3662 #ifndef DISABLE_DKIM
3663 {
3664 # ifdef MEASURE_TIMING
3665 struct timeval t0;
3666 gettimeofday(&t0, NULL);
3667 # endif
3668 dkim_exim_sign_init();
3669 # ifdef EXPERIMENTAL_ARC
3670 {
3671 uschar * s = ob->arc_sign;
3672 if (s)
3673 {
3674 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3675 {
3676 if (!f.expand_string_forcedfail)
3677 {
3678 message = US"failed to expand arc_sign";
3679 sx->ok = FALSE;
3680 goto SEND_FAILED;
3681 }
3682 }
3683 else if (*s)
3684 {
3685 /* Ask dkim code to hash the body for ARC */
3686 (void) arc_ams_setup_sign_bodyhash();
3687 ob->dkim.force_bodyhash = TRUE;
3688 }
3689 }
3690 }
3691 # endif
3692 # ifdef MEASURE_TIMING
3693 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3694 # endif
3695 }
3696 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3697 #else
3698 sx->ok = transport_write_message(&tctx, 0);
3699 #endif
3700
3701 /* transport_write_message() uses write() because it is called from other
3702 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3703 it can exit with "Broken pipe" as its error. This really means that the
3704 socket got closed at the far end. */
3705
3706 transport_write_timeout = 0; /* for subsequent transports */
3707
3708 /* Failure can either be some kind of I/O disaster (including timeout),
3709 or the failure of a transport filter or the expansion of added headers.
3710 Or, when CHUNKING, it can be a protocol-detected failure. */
3711
3712 if (!sx->ok)
3713 if (message) goto SEND_FAILED;
3714 else goto RESPONSE_FAILED;
3715
3716 /* We used to send the terminating "." explicitly here, but because of
3717 buffering effects at both ends of TCP/IP connections, you don't gain
3718 anything by keeping it separate, so it might as well go in the final
3719 data buffer for efficiency. This is now done by setting the topt_end_dot
3720 flag above. */
3721
3722 smtp_command = US"end of data";
3723
3724 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
3725 {
3726 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3727 switch(sync_responses(sx, sx->cmd_count-1, 0))
3728 {
3729 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3730 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3731 break;
3732
3733 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3734 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3735 case 0: break; /* No 2xx or 5xx, but no probs */
3736
3737 case -1: goto END_OFF; /* Timeout on RCPT */
3738
3739 #ifndef DISABLE_PIPE_CONNECT
3740 case -5: /* TLS first-read error */
3741 case -4: HDEBUG(D_transport)
3742 debug_printf("failed reaping pipelined cmd responses\n");
3743 #endif
3744 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3745 }
3746 }
3747
3748 #ifndef DISABLE_PRDR
3749 /* For PRDR we optionally get a partial-responses warning followed by the
3750 individual responses, before going on with the overall response. If we don't
3751 get the warning then deal with per non-PRDR. */
3752
3753 if(sx->prdr_active)
3754 {
3755 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
3756 if (!sx->ok && errno == 0) switch(sx->buffer[0])
3757 {
3758 case '2': sx->prdr_active = FALSE;
3759 sx->ok = TRUE;
3760 break;
3761 case '4': errno = ERRNO_DATA4XX;
3762 addrlist->more_errno |=
3763 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3764 break;
3765 }
3766 }
3767 else
3768 #endif
3769
3770 /* For non-PRDR SMTP, we now read a single response that applies to the
3771 whole message. If it is OK, then all the addresses have been delivered. */
3772
3773 if (!sx->lmtp)
3774 {
3775 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3776 ob->final_timeout);
3777 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
3778 {
3779 errno = ERRNO_DATA4XX;
3780 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3781 }
3782 }
3783
3784 /* For LMTP, we get back a response for every RCPT command that we sent;
3785 some may be accepted and some rejected. For those that get a response, their
3786 status is fixed; any that are accepted have been handed over, even if later
3787 responses crash - at least, that's how I read RFC 2033.
3788
3789 If all went well, mark the recipient addresses as completed, record which
3790 host/IPaddress they were delivered to, and cut out RSET when sending another
3791 message down the same channel. Write the completed addresses to the journal
3792 now so that they are recorded in case there is a crash of hardware or
3793 software before the spool gets updated. Also record the final SMTP
3794 confirmation if needed (for SMTP only). */
3795
3796 if (sx->ok)
3797 {
3798 int flag = '=';
3799 struct timeval delivery_time;
3800 int len;
3801 uschar * conf = NULL;
3802
3803 timesince(&delivery_time, &sx->delivery_start);
3804 sx->send_rset = FALSE;
3805 pipelining_active = FALSE;
3806
3807 /* Set up confirmation if needed - applies only to SMTP */
3808
3809 if (
3810 #ifdef DISABLE_EVENT
3811 LOGGING(smtp_confirmation) &&
3812 #endif
3813 !sx->lmtp
3814 )
3815 {
3816 const uschar *s = string_printing(sx->buffer);
3817 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3818 conf = (s == sx->buffer)? US string_copy(s) : US s;
3819 }
3820
3821 /* Process all transported addresses - for LMTP or PRDR, read a status for
3822 each one. */
3823
3824 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3825 {
3826 if (addr->transport_return != PENDING_OK) continue;
3827
3828 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3829 remaining addresses. Otherwise, it's a return code for just the one
3830 address. For temporary errors, add a retry item for the address so that
3831 it doesn't get tried again too soon. */
3832
3833 #ifndef DISABLE_PRDR
3834 if (sx->lmtp || sx->prdr_active)
3835 #else
3836 if (sx->lmtp)
3837 #endif
3838 {
3839 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3840 ob->final_timeout))
3841 {
3842 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
3843 addr->message = string_sprintf(
3844 #ifndef DISABLE_PRDR
3845 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
3846 #else
3847 "LMTP error after %s: %s",
3848 #endif
3849 data_command, string_printing(sx->buffer));
3850 setflag(addr, af_pass_message); /* Allow message to go to user */
3851 if (sx->buffer[0] == '5')
3852 addr->transport_return = FAIL;
3853 else
3854 {
3855 errno = ERRNO_DATA4XX;
3856 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3857 addr->transport_return = DEFER;
3858 #ifndef DISABLE_PRDR
3859 if (!sx->prdr_active)
3860 #endif
3861 retry_add_item(addr, addr->address_retry_key, 0);
3862 }
3863 continue;
3864 }
3865 sx->completed_addr = TRUE; /* NOW we can set this flag */
3866 if (LOGGING(smtp_confirmation))
3867 {
3868 const uschar *s = string_printing(sx->buffer);
3869 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3870 conf = (s == sx->buffer) ? US string_copy(s) : US s;
3871 }
3872 }
3873
3874 /* SMTP, or success return from LMTP for this address. Pass back the
3875 actual host that was used. */
3876
3877 addr->transport_return = OK;
3878 addr->host_used = host;
3879 addr->delivery_time = delivery_time;
3880 addr->special_action = flag;
3881 addr->message = conf;
3882
3883 if (tcp_out_fastopen)
3884 {
3885 setflag(addr, af_tcp_fastopen_conn);
3886 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3887 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3888 }
3889 if (sx->pipelining_used) setflag(addr, af_pipelining);
3890 #ifndef DISABLE_PIPE_CONNECT
3891 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
3892 #endif
3893 #ifndef DISABLE_PRDR
3894 if (sx->prdr_active) setflag(addr, af_prdr_used);
3895 #endif
3896 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3897 flag = '-';
3898
3899 #ifndef DISABLE_PRDR
3900 if (!sx->prdr_active)
3901 #endif
3902 {
3903 /* Update the journal. For homonymic addresses, use the base address plus
3904 the transport name. See lots of comments in deliver.c about the reasons
3905 for the complications when homonyms are involved. Just carry on after
3906 write error, as it may prove possible to update the spool file later. */
3907
3908 if (testflag(addr, af_homonym))
3909 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3910 else
3911 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
3912
3913 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx->buffer);
3914 len = Ustrlen(CS sx->buffer);
3915 if (write(journal_fd, sx->buffer, len) != len)
3916 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3917 "%s: %s", sx->buffer, strerror(errno));
3918 }
3919 }
3920
3921 #ifndef DISABLE_PRDR
3922 if (sx->prdr_active)
3923 {
3924 const uschar * overall_message;
3925
3926 /* PRDR - get the final, overall response. For any non-success
3927 upgrade all the address statuses. */
3928
3929 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3930 ob->final_timeout);
3931 if (!sx->ok)
3932 {
3933 if(errno == 0 && sx->buffer[0] == '4')
3934 {
3935 errno = ERRNO_DATA4XX;
3936 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3937 }
3938 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3939 if (sx->buffer[0] == '5' || addr->transport_return == OK)
3940 addr->transport_return = PENDING_OK; /* allow set_errno action */
3941 goto RESPONSE_FAILED;
3942 }
3943
3944 /* Append the overall response to the individual PRDR response for logging
3945 and update the journal, or setup retry. */
3946
3947 overall_message = string_printing(sx->buffer);
3948 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3949 if (addr->transport_return == OK)
3950 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3951
3952 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3953 if (addr->transport_return == OK)
3954 {
3955 if (testflag(addr, af_homonym))
3956 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3957 else
3958 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
3959
3960 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
3961 len = Ustrlen(CS sx->buffer);
3962 if (write(journal_fd, sx->buffer, len) != len)
3963 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3964 "%s: %s", sx->buffer, strerror(errno));
3965 }
3966 else if (addr->transport_return == DEFER)
3967 retry_add_item(addr, addr->address_retry_key, -2);
3968 }
3969 #endif
3970
3971 /* Ensure the journal file is pushed out to disk. */
3972
3973 if (EXIMfsync(journal_fd) < 0)
3974 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3975 strerror(errno));
3976 }
3977 }
3978
3979
3980 /* Handle general (not specific to one address) failures here. The value of ok
3981 is used to skip over this code on the falling through case. A timeout causes a
3982 deferral. Other errors may defer or fail according to the response code, and
3983 may set up a special errno value, e.g. after connection chopped, which is
3984 assumed if errno == 0 and there is no text in the buffer. If control reaches
3985 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3986 the problem is not related to this specific message. */
3987
3988 if (!sx->ok)
3989 {
3990 int code, set_rc;
3991 uschar * set_message;
3992
3993 RESPONSE_FAILED:
3994 {
3995 save_errno = errno;
3996 message = NULL;
3997 sx->send_quit = check_response(host, &save_errno, addrlist->more_errno,
3998 sx->buffer, &code, &message, &pass_message);
3999 goto FAILED;
4000 }
4001
4002 SEND_FAILED:
4003 {
4004 save_errno = errno;
4005 code = '4';
4006 message = string_sprintf("send() to %s [%s] failed: %s",
4007 host->name, host->address, message ? message : US strerror(save_errno));
4008 sx->send_quit = FALSE;
4009 goto FAILED;
4010 }
4011
4012 FAILED:
4013 {
4014 BOOL message_error;
4015
4016 sx->ok = FALSE; /* For when reached by GOTO */
4017 set_message = message;
4018
4019 /* We want to handle timeouts after MAIL or "." and loss of connection after
4020 "." specially. They can indicate a problem with the sender address or with
4021 the contents of the message rather than a real error on the connection. These
4022 cases are treated in the same way as a 4xx response. This next bit of code
4023 does the classification. */
4024
4025 switch(save_errno)
4026 {
4027 case 0:
4028 case ERRNO_MAIL4XX:
4029 case ERRNO_DATA4XX:
4030 message_error = TRUE;
4031 break;
4032
4033 case ETIMEDOUT:
4034 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4035 Ustrncmp(smtp_command,"end ",4) == 0;
4036 break;
4037
4038 case ERRNO_SMTPCLOSED:
4039 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4040 break;
4041
4042 default:
4043 message_error = FALSE;
4044 break;
4045 }
4046
4047 /* Handle the cases that are treated as message errors. These are:
4048
4049 (a) negative response or timeout after MAIL
4050 (b) negative response after DATA
4051 (c) negative response or timeout or dropped connection after "."
4052 (d) utf8 support required and not offered
4053
4054 It won't be a negative response or timeout after RCPT, as that is dealt
4055 with separately above. The action in all cases is to set an appropriate
4056 error code for all the addresses, but to leave yield set to OK because the
4057 host itself has not failed. Of course, it might in practice have failed
4058 when we've had a timeout, but if so, we'll discover that at the next
4059 delivery attempt. For a temporary error, set the message_defer flag, and
4060 write to the logs for information if this is not the last host. The error
4061 for the last host will be logged as part of the address's log line. */
4062
4063 if (message_error)
4064 {
4065 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4066
4067 /* If there's an errno, the message contains just the identity of
4068 the host. */
4069
4070 if (code == '5')
4071 set_rc = FAIL;
4072 else /* Anything other than 5 is treated as temporary */
4073 {
4074 set_rc = DEFER;
4075 if (save_errno > 0)
4076 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4077
4078 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4079
4080 *message_defer = TRUE;
4081 }
4082 }
4083
4084 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4085 ".", or some other transportation error. We defer all addresses and yield
4086 DEFER, except for the case of failed add_headers expansion, or a transport
4087 filter failure, when the yield should be ERROR, to stop it trying other
4088 hosts. */
4089
4090 else
4091 {
4092 #ifndef DISABLE_PIPE_CONNECT
4093 /* If we were early-pipelinng and the actual EHLO response did not match
4094 the cached value we assumed, we could have detected it and passed a
4095 custom errno through to here. It would be nice to RSET and retry right
4096 away, but to reliably do that we eould need an extra synch point before
4097 we committed to data and that would discard half the gained roundrips.
4098 Or we could summarily drop the TCP connection. but that is also ugly.
4099 Instead, we ignore the possibility (having freshened the cache) and rely
4100 on the server telling us with a nonmessage error if we have tried to
4101 do something it no longer supports. */
4102 #endif
4103 set_rc = DEFER;
4104 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4105 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4106 }
4107 }
4108
4109 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4110 #ifdef EXPERIMENTAL_DSN_INFO
4111 sx->smtp_greeting, sx->helo_response,
4112 #endif
4113 &sx->delivery_start);
4114 }
4115
4116 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4117 SMTP session tidily. However, if there were too many addresses to send in one
4118 message (indicated by first_addr being non-NULL) we want to carry on with the
4119 rest of them. Also, it is desirable to send more than one message down the SMTP
4120 connection if there are several waiting, provided we haven't already sent so
4121 many as to hit the configured limit. The function transport_check_waiting looks
4122 for a waiting message and returns its id. Then transport_pass_socket tries to
4123 set up a continued delivery by passing the socket on to another process. The
4124 variable send_rset is FALSE if a message has just been successfully transferred.
4125
4126 If we are already sending down a continued channel, there may be further
4127 addresses not yet delivered that are aimed at the same host, but which have not
4128 been passed in this run of the transport. In this case, continue_more will be
4129 true, and all we should do is send RSET if necessary, and return, leaving the
4130 channel open.
4131
4132 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4133 do not want to continue with other messages down the same channel, because that
4134 can lead to looping between two or more messages, all with the same,
4135 temporarily failing address(es). [The retry information isn't updated yet, so
4136 new processes keep on trying.] We probably also don't want to try more of this
4137 message's addresses either.
4138
4139 If we have started a TLS session, we have to end it before passing the
4140 connection to a new process. However, not all servers can handle this (Exim
4141 can), so we do not pass such a connection on if the host matches
4142 hosts_nopass_tls. */
4143
4144 DEBUG(D_transport)
4145 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4146 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4147 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4148
4149 if (sx->completed_addr && sx->ok && sx->send_quit)
4150 {
4151 BOOL more;
4152 smtp_compare_t t_compare;
4153
4154 t_compare.tblock = tblock;
4155 t_compare.current_sender_address = sender_address;
4156
4157 if ( sx->first_addr != NULL
4158 || f.continue_more
4159 || (
4160 #ifndef DISABLE_TLS
4161 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4162 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4163 )
4164 &&
4165 #endif
4166 transport_check_waiting(tblock->name, host->name,
4167 tblock->connection_max_messages, new_message_id, &more,
4168 (oicf)smtp_are_same_identities, (void*)&t_compare)
4169 ) )
4170 {
4171 uschar *msg;
4172 BOOL pass_message;
4173
4174 if (sx->send_rset)
4175 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4176 {
4177 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4178 host->address, strerror(errno));
4179 sx->send_quit = FALSE;
4180 }
4181 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4182 '2', ob->command_timeout)))
4183 {
4184 int code;
4185 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4186 &pass_message);
4187 if (!sx->send_quit)
4188 {
4189 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4190 host->name, host->address, msg);
4191 }
4192 }
4193
4194 /* Either RSET was not needed, or it succeeded */
4195
4196 if (sx->ok)
4197 {
4198 #ifndef DISABLE_TLS
4199 int pfd[2];
4200 #endif
4201 int socket_fd = sx->cctx.sock;
4202
4203
4204 if (sx->first_addr != NULL) /* More addresses still to be sent */
4205 { /* in this run of the transport */
4206 continue_sequence++; /* Causes * in logging */
4207 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4208 goto SEND_MESSAGE;
4209 }
4210
4211 /* Unless caller said it already has more messages listed for this host,
4212 pass the connection on to a new Exim process (below, the call to
4213 transport_pass_socket). If the caller has more ready, just return with
4214 the connection still open. */
4215
4216 #ifndef DISABLE_TLS
4217 if (tls_out.active.sock >= 0)
4218 if ( f.continue_more
4219 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4220 {
4221 /* Before passing the socket on, or returning to caller with it still
4222 open, we must shut down TLS. Not all MTAs allow for the continuation
4223 of the SMTP session when TLS is shut down. We test for this by sending
4224 a new EHLO. If we don't get a good response, we don't attempt to pass
4225 the socket on. */
4226
4227 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4228 sx->cctx.tls_ctx = NULL;
4229 smtp_peer_options = smtp_peer_options_wrap;
4230 sx->ok = !sx->smtps
4231 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4232 >= 0
4233 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4234 '2', ob->command_timeout);
4235
4236 if (sx->ok && f.continue_more)
4237 return yield; /* More addresses for another run */
4238 }
4239 else
4240 {
4241 /* Set up a pipe for proxying TLS for the new transport process */
4242
4243 smtp_peer_options |= OPTION_TLS;
4244 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4245 socket_fd = pfd[1];
4246 else
4247 set_errno(sx->first_addr, errno, US"internal allocation problem",
4248 DEFER, FALSE, host,
4249 # ifdef EXPERIMENTAL_DSN_INFO
4250 sx->smtp_greeting, sx->helo_response,
4251 # endif
4252 &sx->delivery_start);
4253 }
4254 else
4255 #endif
4256 if (f.continue_more)
4257 return yield; /* More addresses for another run */
4258
4259 /* If the socket is successfully passed, we mustn't send QUIT (or
4260 indeed anything!) from here. */
4261
4262 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4263 propagate it from the initial
4264 */
4265 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4266 host->address, new_message_id, socket_fd))
4267 {
4268 sx->send_quit = FALSE;
4269
4270 /* We have passed the client socket to a fresh transport process.
4271 If TLS is still active, we need to proxy it for the transport we
4272 just passed the baton to. Fork a child to to do it, and return to
4273 get logging done asap. Which way to place the work makes assumptions
4274 about post-fork prioritisation which may not hold on all platforms. */
4275 #ifndef DISABLE_TLS
4276 if (tls_out.active.sock >= 0)
4277 {
4278 int pid = exim_fork(US"tls-proxy-interproc");
4279 if (pid == 0) /* child; fork again to disconnect totally */
4280 {
4281 /* does not return */
4282 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4283 ob->command_timeout);
4284 }
4285
4286 if (pid > 0) /* parent */
4287 {
4288 close(pfd[0]);
4289 /* tidy the inter-proc to disconn the proxy proc */
4290 waitpid(pid, NULL, 0);
4291 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4292 sx->cctx.tls_ctx = NULL;
4293 (void)close(sx->cctx.sock);
4294 sx->cctx.sock = -1;
4295 continue_transport = NULL;
4296 continue_hostname = NULL;
4297 return yield;
4298 }
4299 log_write(0, LOG_PANIC_DIE, "fork failed");
4300 }
4301 #endif
4302 }
4303 }
4304
4305 /* If RSET failed and there are addresses left, they get deferred. */
4306 else
4307 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4308 #ifdef EXPERIMENTAL_DSN_INFO
4309 sx->smtp_greeting, sx->helo_response,
4310 #endif
4311 &sx->delivery_start);
4312 }
4313 }
4314
4315 /* End off tidily with QUIT unless the connection has died or the socket has
4316 been passed to another process. There has been discussion on the net about what
4317 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4318 to wait for a response, but on the other hand, there isn't anything one can do
4319 with an error response, other than log it. Exim used to do that. However,
4320 further discussion suggested that it is positively advantageous not to wait for
4321 the response, but to close the session immediately. This is supposed to move
4322 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4323 load from the server. (Hosts that are both servers and clients may not see much
4324 difference, of course.) Further discussion indicated that this was safe to do
4325 on Unix systems which have decent implementations of TCP/IP that leave the
4326 connection around for a while (TIME_WAIT) after the application has gone away.
4327 This enables the response sent by the server to be properly ACKed rather than
4328 timed out, as can happen on broken TCP/IP implementations on other OS.
4329
4330 This change is being made on 31-Jul-98. After over a year of trouble-free
4331 operation, the old commented-out code was removed on 17-Sep-99. */
4332
4333 SEND_QUIT:
4334 #ifdef TCP_CORK
4335 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4336 #endif
4337 if (sx->send_quit) (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4338
4339 END_OFF:
4340
4341 #ifndef DISABLE_TLS
4342 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4343 sx->cctx.tls_ctx = NULL;
4344 #endif
4345
4346 /* Close the socket, and return the appropriate value, first setting
4347 works because the NULL setting is passed back to the calling process, and
4348 remote_max_parallel is forced to 1 when delivering over an existing connection,
4349
4350 If all went well and continue_more is set, we shouldn't actually get here if
4351 there are further addresses, as the return above will be taken. However,
4352 writing RSET might have failed, or there may be other addresses whose hosts are
4353 specified in the transports, and therefore not visible at top level, in which
4354 case continue_more won't get set. */
4355
4356 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4357 if (sx->send_quit)
4358 {
4359 shutdown(sx->cctx.sock, SHUT_WR);
4360 millisleep(20);
4361 testharness_pause_ms(200);
4362 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4363 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
4364 i--; /* drain socket */
4365 }
4366 (void)close(sx->cctx.sock);
4367
4368 #ifndef DISABLE_EVENT
4369 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4370 #endif
4371
4372 continue_transport = NULL;
4373 continue_hostname = NULL;
4374 return yield;
4375 }
4376
4377
4378
4379
4380 /*************************************************
4381 * Closedown entry point *
4382 *************************************************/
4383
4384 /* This function is called when exim is passed an open smtp channel
4385 from another incarnation, but the message which it has been asked
4386 to deliver no longer exists. The channel is on stdin.
4387
4388 We might do fancy things like looking for another message to send down
4389 the channel, but if the one we sought has gone, it has probably been
4390 delivered by some other process that itself will seek further messages,
4391 so just close down our connection.
4392
4393 Argument: pointer to the transport instance block
4394 Returns: nothing
4395 */
4396
4397 void
4398 smtp_transport_closedown(transport_instance *tblock)
4399 {
4400 smtp_transport_options_block * ob = SOB tblock->options_block;
4401 client_conn_ctx cctx;
4402 smtp_context sx;
4403 uschar buffer[256];
4404 uschar inbuffer[4096];
4405 uschar outbuffer[16];
4406
4407 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4408 cctx.sock = fileno(stdin);
4409 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4410
4411 sx.inblock.cctx = &cctx;
4412 sx.inblock.buffer = inbuffer;
4413 sx.inblock.buffersize = sizeof(inbuffer);
4414 sx.inblock.ptr = inbuffer;
4415 sx.inblock.ptrend = inbuffer;
4416
4417 sx.outblock.cctx = &cctx;
4418 sx.outblock.buffersize = sizeof(outbuffer);
4419 sx.outblock.buffer = outbuffer;
4420 sx.outblock.ptr = outbuffer;
4421 sx.outblock.cmd_count = 0;
4422 sx.outblock.authenticating = FALSE;
4423
4424 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4425 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4426 (void)close(cctx.sock);
4427 }
4428
4429
4430
4431 /*************************************************
4432 * Prepare addresses for delivery *
4433 *************************************************/
4434
4435 /* This function is called to flush out error settings from previous delivery
4436 attempts to other hosts. It also records whether we got here via an MX record
4437 or not in the more_errno field of the address. We are interested only in
4438 addresses that are still marked DEFER - others may have got delivered to a
4439 previously considered IP address. Set their status to PENDING_DEFER to indicate
4440 which ones are relevant this time.
4441
4442 Arguments:
4443 addrlist the list of addresses
4444 host the host we are delivering to
4445
4446 Returns: the first address for this delivery
4447 */
4448
4449 static address_item *
4450 prepare_addresses(address_item *addrlist, host_item *host)
4451 {
4452 address_item *first_addr = NULL;
4453 for (address_item * addr = addrlist; addr; addr = addr->next)
4454 if (addr->transport_return == DEFER)
4455 {
4456 if (!first_addr) first_addr = addr;
4457 addr->transport_return = PENDING_DEFER;
4458 addr->basic_errno = 0;
4459 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4460 addr->message = NULL;
4461 #ifndef DISABLE_TLS
4462 addr->cipher = NULL;
4463 addr->ourcert = NULL;
4464 addr->peercert = NULL;
4465 addr->peerdn = NULL;
4466 addr->ocsp = OCSP_NOT_REQ;
4467 addr->tlsver = NULL;
4468 #endif
4469 #ifdef EXPERIMENTAL_DSN_INFO
4470 addr->smtp_greeting = NULL;
4471 addr->helo_response = NULL;
4472 #endif
4473 }
4474 return first_addr;
4475 }
4476
4477
4478
4479 /*************************************************
4480 * Main entry point *
4481 *************************************************/
4482
4483 /* See local README for interface details. As this is a remote transport, it is
4484 given a chain of addresses to be delivered in one connection, if possible. It
4485 always returns TRUE, indicating that each address has its own independent
4486 status set, except if there is a setting up problem, in which case it returns
4487 FALSE. */
4488
4489 BOOL
4490 smtp_transport_entry(
4491 transport_instance *tblock, /* data for this instantiation */
4492 address_item *addrlist) /* addresses we are working on */
4493 {
4494 int defport;
4495 int hosts_defer = 0;
4496 int hosts_fail = 0;
4497 int hosts_looked_up = 0;
4498 int hosts_retry = 0;
4499 int hosts_serial = 0;
4500 int hosts_total = 0;
4501 int total_hosts_tried = 0;
4502 BOOL expired = TRUE;
4503 uschar *expanded_hosts = NULL;
4504 uschar *pistring;
4505 uschar *tid = string_sprintf("%s transport", tblock->name);
4506 smtp_transport_options_block *ob = SOB tblock->options_block;
4507 host_item *hostlist = addrlist->host_list;
4508 host_item *host = NULL;
4509
4510 DEBUG(D_transport)
4511 {
4512 debug_printf("%s transport entered\n", tblock->name);
4513 for (address_item * addr = addrlist; addr; addr = addr->next)
4514 debug_printf(" %s\n", addr->address);
4515 if (hostlist)
4516 {
4517 debug_printf("hostlist:\n");
4518 for (host_item * host = hostlist; host; host = host->next)
4519 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4520 }
4521 if (continue_hostname)
4522 debug_printf("already connected to %s [%s] (on fd %d)\n",
4523 continue_hostname, continue_host_address,
4524 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4525 }
4526
4527 /* Set the flag requesting that these hosts be added to the waiting
4528 database if the delivery fails temporarily or if we are running with
4529 queue_smtp or a 2-stage queue run. This gets unset for certain
4530 kinds of error, typically those that are specific to the message. */
4531
4532 update_waiting = TRUE;
4533
4534 /* If a host list is not defined for the addresses - they must all have the
4535 same one in order to be passed to a single transport - or if the transport has
4536 a host list with hosts_override set, use the host list supplied with the
4537 transport. It is an error for this not to exist. */
4538
4539 if (!hostlist || (ob->hosts_override && ob->hosts))
4540 {
4541 if (!ob->hosts)
4542 {
4543 addrlist->message = string_sprintf("%s transport called with no hosts set",
4544 tblock->name);
4545 addrlist->transport_return = PANIC;
4546 return FALSE; /* Only top address has status */
4547 }
4548
4549 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4550 ob->hosts);
4551
4552 /* If the transport's host list contains no '$' characters, and we are not
4553 randomizing, it is fixed and therefore a chain of hosts can be built once
4554 and for all, and remembered for subsequent use by other calls to this
4555 transport. If, on the other hand, the host list does contain '$', or we are
4556 randomizing its order, we have to rebuild it each time. In the fixed case,
4557 as the hosts string will never be used again, it doesn't matter that we
4558 replace all the : characters with zeros. */
4559
4560 if (!ob->hostlist)
4561 {
4562 uschar *s = ob->hosts;
4563
4564 if (Ustrchr(s, '$') != NULL)
4565 {
4566 if (!(expanded_hosts = expand_string(s)))
4567 {
4568 addrlist->message = string_sprintf("failed to expand list of hosts "
4569 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4570 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4571 return FALSE; /* Only top address has status */
4572 }
4573 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4574 "\"%s\"\n", s, expanded_hosts);
4575 s = expanded_hosts;
4576 }
4577 else
4578 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4579
4580 if (is_tainted(s))
4581 {
4582 log_write(0, LOG_MAIN|LOG_PANIC,
4583 "attempt to use tainted host list '%s' from '%s' in transport %s",
4584 s, ob->hosts, tblock->name);
4585 /* Avoid leaking info to an attacker */
4586 addrlist->message = US"internal configuration error";
4587 addrlist->transport_return = PANIC;
4588 return FALSE;
4589 }
4590
4591 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4592
4593 /* Check that the expansion yielded something useful. */
4594 if (!hostlist)
4595 {
4596 addrlist->message =
4597 string_sprintf("%s transport has empty hosts setting", tblock->name);
4598 addrlist->transport_return = PANIC;
4599 return FALSE; /* Only top address has status */
4600 }
4601
4602 /* If there was no expansion of hosts, save the host list for
4603 next time. */
4604
4605 if (!expanded_hosts) ob->hostlist = hostlist;
4606 }
4607
4608 /* This is not the first time this transport has been run in this delivery;
4609 the host list was built previously. */
4610
4611 else
4612 hostlist = ob->hostlist;
4613 }
4614
4615 /* The host list was supplied with the address. If hosts_randomize is set, we
4616 must sort it into a random order if it did not come from MX records and has not
4617 already been randomized (but don't bother if continuing down an existing
4618 connection). */
4619
4620 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4621 {
4622 host_item *newlist = NULL;
4623 while (hostlist)
4624 {
4625 host_item *h = hostlist;
4626 hostlist = hostlist->next;
4627
4628 h->sort_key = random_number(100);
4629
4630 if (!newlist)
4631 {
4632 h->next = NULL;
4633 newlist = h;
4634 }
4635 else if (h->sort_key < newlist->sort_key)
4636 {
4637 h->next = newlist;
4638 newlist = h;
4639 }
4640 else
4641 {
4642 host_item *hh = newlist;
4643 while (hh->next)
4644 {
4645 if (h->sort_key < hh->next->sort_key) break;
4646 hh = hh->next;
4647 }
4648 h->next = hh->next;
4649 hh->next = h;
4650 }
4651 }
4652
4653 hostlist = addrlist->host_list = newlist;
4654 }
4655
4656 /* Sort out the default port. */
4657
4658 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4659
4660 /* For each host-plus-IP-address on the list:
4661
4662 . If this is a continued delivery and the host isn't the one with the
4663 current connection, skip.
4664
4665 . If the status is unusable (i.e. previously failed or retry checked), skip.
4666
4667 . If no IP address set, get the address, either by turning the name into
4668 an address, calling gethostbyname if gethostbyname is on, or by calling
4669 the DNS. The DNS may yield multiple addresses, in which case insert the
4670 extra ones into the list.
4671
4672 . Get the retry data if not previously obtained for this address and set the
4673 field which remembers the state of this address. Skip if the retry time is
4674 not reached. If not, remember whether retry data was found. The retry string
4675 contains both the name and the IP address.
4676
4677 . Scan the list of addresses and mark those whose status is DEFER as
4678 PENDING_DEFER. These are the only ones that will be processed in this cycle
4679 of the hosts loop.
4680
4681 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4682 Some addresses may be successfully delivered, others may fail, and yet
4683 others may get temporary errors and so get marked DEFER.
4684
4685 . The return from the delivery attempt is OK if a connection was made and a
4686 valid SMTP dialogue was completed. Otherwise it is DEFER.
4687
4688 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4689
4690 . If fail to connect, or other defer state, add a retry item.
4691
4692 . If there are any addresses whose status is still DEFER, carry on to the
4693 next host/IPaddress, unless we have tried the number of hosts given
4694 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4695 there is some fancy logic for hosts_max_try that means its limit can be
4696 overstepped in some circumstances.
4697
4698 If we get to the end of the list, all hosts have deferred at least one address,
4699 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4700 delivery attempt to those hosts whose last try was before the arrival time of
4701 the current message. To cope with this, we have to go round the loop a second
4702 time. After that, set the status and error data for any addresses that haven't
4703 had it set already. */
4704
4705 for (int cutoff_retry = 0;
4706 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4707 cutoff_retry++)
4708 {
4709 host_item *nexthost = NULL;
4710 int unexpired_hosts_tried = 0;
4711 BOOL continue_host_tried = FALSE;
4712
4713 retry_non_continued:
4714 for (host = hostlist;
4715 host
4716 && unexpired_hosts_tried < ob->hosts_max_try
4717 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4718 host = nexthost)
4719 {
4720 int rc;
4721 int host_af;
4722 BOOL host_is_expired = FALSE;
4723 BOOL message_defer = FALSE;
4724 BOOL some_deferred = FALSE;
4725 address_item *first_addr = NULL;
4726 uschar *interface = NULL;
4727 uschar *retry_host_key = NULL;
4728 uschar *retry_message_key = NULL;
4729 uschar *serialize_key = NULL;
4730
4731 /* Default next host is next host. :-) But this can vary if the
4732 hosts_max_try limit is hit (see below). It may also be reset if a host
4733 address is looked up here (in case the host was multihomed). */
4734
4735 nexthost = host->next;
4736
4737 /* If the address hasn't yet been obtained from the host name, look it up
4738 now, unless the host is already marked as unusable. If it is marked as
4739 unusable, it means that the router was unable to find its IP address (in
4740 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4741 the lookup failed last time. We don't get this far if *all* MX records
4742 point to non-existent hosts; that is treated as a hard error.
4743
4744 We can just skip this host entirely. When the hosts came from the router,
4745 the address will timeout based on the other host(s); when the address is
4746 looked up below, there is an explicit retry record added.
4747
4748 Note that we mustn't skip unusable hosts if the address is not unset; they
4749 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4750
4751 if (!host->address)
4752 {
4753 int new_port, flags;
4754
4755 if (host->status >= hstatus_unusable)
4756 {
4757 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4758 host->name);
4759 continue;
4760 }
4761
4762 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4763
4764 /* The host name is permitted to have an attached port. Find it, and
4765 strip it from the name. Just remember it for now. */
4766
4767 new_port = host_item_get_port(host);
4768
4769 /* Count hosts looked up */
4770
4771 hosts_looked_up++;
4772
4773 /* Find by name if so configured, or if it's an IP address. We don't
4774 just copy the IP address, because we need the test-for-local to happen. */
4775
4776 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4777 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4778 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4779
4780 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4781 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4782 else
4783 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4784 &ob->dnssec, /* domains for request/require */
4785 NULL, NULL);
4786
4787 /* Update the host (and any additional blocks, resulting from
4788 multihoming) with a host-specific port, if any. */
4789
4790 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4791
4792 /* Failure to find the host at this time (usually DNS temporary failure)
4793 is really a kind of routing failure rather than a transport failure.
4794 Therefore we add a retry item of the routing kind, not to stop us trying
4795 to look this name up here again, but to ensure the address gets timed
4796 out if the failures go on long enough. A complete failure at this point
4797 commonly points to a configuration error, but the best action is still
4798 to carry on for the next host. */
4799
4800 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4801 {
4802 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4803 expired = FALSE;
4804 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4805 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4806 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4807 host->status = hstatus_unusable;
4808
4809 for (address_item * addr = addrlist; addr; addr = addr->next)
4810 {
4811 if (addr->transport_return != DEFER) continue;
4812 addr->basic_errno = ERRNO_UNKNOWNHOST;
4813 addr->message = string_sprintf(
4814 rc == HOST_FIND_SECURITY
4815 ? "lookup of IP address for %s was insecure"
4816 : "failed to lookup IP address for %s",
4817 host->name);
4818 }
4819 continue;
4820 }
4821
4822 /* If the host is actually the local host, we may have a problem, or
4823 there may be some cunning configuration going on. In the problem case,
4824 log things and give up. The default transport status is already DEFER. */
4825
4826 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4827 {
4828 for (address_item * addr = addrlist; addr; addr = addr->next)
4829 {
4830 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
4831 addr->message = string_sprintf("%s transport found host %s to be "
4832 "local", tblock->name, host->name);
4833 }
4834 goto END_TRANSPORT;
4835 }
4836 } /* End of block for IP address lookup */
4837
4838 /* If this is a continued delivery, we are interested only in the host
4839 which matches the name of the existing open channel. The check is put
4840 here after the local host lookup, in case the name gets expanded as a
4841 result of the lookup. Set expired FALSE, to save the outer loop executing
4842 twice. */
4843
4844 if (continue_hostname)
4845 if ( Ustrcmp(continue_hostname, host->name) != 0
4846 || Ustrcmp(continue_host_address, host->address) != 0
4847 )
4848 {
4849 expired = FALSE;
4850 continue; /* With next host */
4851 }
4852 else
4853 continue_host_tried = TRUE;
4854
4855 /* Reset the default next host in case a multihomed host whose addresses
4856 are not looked up till just above added to the host list. */
4857
4858 nexthost = host->next;
4859
4860 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4861 domain is in queue_smtp_domains, we don't actually want to attempt any
4862 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4863 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4864 were not in it. We don't want to hold up all SMTP deliveries! Except when
4865 doing a two-stage queue run, don't do this if forcing. */
4866
4867 if ( (!f.deliver_force || f.queue_2stage)
4868 && ( f.queue_smtp
4869 || match_isinlist(addrlist->domain,
4870 CUSS &queue_smtp_domains, 0,
4871 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
4872 )
4873 {
4874 DEBUG(D_transport) debug_printf("first-pass routing only\n");
4875 expired = FALSE;
4876 for (address_item * addr = addrlist; addr; addr = addr->next)
4877 if (addr->transport_return == DEFER)
4878 addr->message = US"first-pass only routing due to -odqs, "
4879 "queue_smtp_domains or control=queue";
4880 continue; /* With next host */
4881 }
4882
4883 /* Count hosts being considered - purely for an intelligent comment
4884 if none are usable. */
4885
4886 hosts_total++;
4887
4888 /* Set $host and $host address now in case they are needed for the
4889 interface expansion or the serialize_hosts check; they remain set if an
4890 actual delivery happens. */
4891
4892 deliver_host = host->name;
4893 deliver_host_address = host->address;
4894 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4895 : host->dnssec == DS_NO ? US"no"
4896 : US"";
4897
4898 /* Set up a string for adding to the retry key if the port number is not
4899 the standard SMTP port. A host may have its own port setting that overrides
4900 the default. */
4901
4902 pistring = string_sprintf(":%d", host->port == PORT_NONE
4903 ? defport : host->port);
4904 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4905
4906 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4907 string is set, even if constant (as different transports can have different
4908 constant settings), we must add it to the key that is used for retries,
4909 because connections to the same host from a different interface should be
4910 treated separately. */
4911
4912 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4913 {
4914 uschar * s = ob->interface;
4915 if (s && *s)
4916 {
4917 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4918 return FALSE;
4919 pistring = string_sprintf("%s/%s", pistring, interface);
4920 }
4921 }
4922
4923 /* The first time round the outer loop, check the status of the host by
4924 inspecting the retry data. The second time round, we are interested only
4925 in expired hosts that haven't been tried since this message arrived. */
4926
4927 if (cutoff_retry == 0)
4928 {
4929 BOOL incl_ip;
4930 /* Ensure the status of the address is set by checking retry data if
4931 necessary. There may be host-specific retry data (applicable to all
4932 messages) and also data for retries of a specific message at this host.
4933 If either of these retry records are actually read, the keys used are
4934 returned to save recomputing them later. */
4935
4936 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4937 US"retry_include_ip_address", ob->retry_include_ip_address,
4938 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4939 continue; /* with next host */
4940
4941 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4942 incl_ip, &retry_host_key, &retry_message_key);
4943
4944 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4945 host->address ? host->address : US"", pistring,
4946 host->status == hstatus_usable ? "usable"
4947 : host->status == hstatus_unusable ? "unusable"
4948 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4949
4950 /* Skip this address if not usable at this time, noting if it wasn't
4951 actually expired, both locally and in the address. */
4952
4953 switch (host->status)
4954 {
4955 case hstatus_unusable:
4956 expired = FALSE;
4957 setflag(addrlist, af_retry_skipped);
4958 /* Fall through */
4959
4960 case hstatus_unusable_expired:
4961 switch (host->why)
4962 {
4963 case hwhy_retry: hosts_retry++; break;
4964 case hwhy_failed: hosts_fail++; break;
4965 case hwhy_insecure:
4966 case hwhy_deferred: hosts_defer++; break;
4967 }
4968
4969 /* If there was a retry message key, implying that previously there
4970 was a message-specific defer, we don't want to update the list of
4971 messages waiting for these hosts. */
4972
4973 if (retry_message_key) update_waiting = FALSE;
4974 continue; /* With the next host or IP address */
4975 }
4976 }
4977
4978 /* Second time round the loop: if the address is set but expired, and
4979 the message is newer than the last try, let it through. */
4980
4981 else
4982 {
4983 if ( !host->address
4984 || host->status != hstatus_unusable_expired
4985 || host->last_try > received_time.tv_sec)
4986 continue;
4987 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4988 host->name, host->address, pistring);
4989 host_is_expired = TRUE;
4990 }
4991
4992 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4993 it remains TRUE only if all hosts are expired and none are actually tried.
4994 */
4995
4996 expired = FALSE;
4997
4998 /* If this host is listed as one to which access must be serialized,
4999 see if another Exim process has a connection to it, and if so, skip
5000 this host. If not, update the database to record our connection to it
5001 and remember this for later deletion. Do not do any of this if we are
5002 sending the message down a pre-existing connection. */
5003
5004 if ( !continue_hostname
5005 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5006 {
5007 serialize_key = string_sprintf("host-serialize-%s", host->name);
5008 if (!enq_start(serialize_key, 1))
5009 {
5010 DEBUG(D_transport)
5011 debug_printf("skipping host %s because another Exim process "
5012 "is connected to it\n", host->name);
5013 hosts_serial++;
5014 continue;
5015 }
5016 }
5017
5018 /* OK, we have an IP address that is not waiting for its retry time to
5019 arrive (it might be expired) OR (second time round the loop) we have an
5020 expired host that hasn't been tried since the message arrived. Have a go
5021 at delivering the message to it. First prepare the addresses by flushing
5022 out the result of previous attempts, and finding the first address that
5023 is still to be delivered. */
5024
5025 first_addr = prepare_addresses(addrlist, host);
5026
5027 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5028 message_id, host->name, host->address, addrlist->address,
5029 addrlist->next ? ", ..." : "");
5030
5031 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5032 message_id, host->name, host->address, pistring, addrlist->address,
5033 addrlist->next ? ", ..." : "");
5034
5035 /* This is not for real; don't do the delivery. If there are
5036 any remaining hosts, list them. */
5037
5038 if (f.dont_deliver)
5039 {
5040 struct timeval now;
5041 gettimeofday(&now, NULL);
5042 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5043 for (address_item * addr = addrlist; addr; addr = addr->next)
5044 {
5045 addr->host_used = host;
5046 addr->special_action = '*';
5047 addr->message = US"delivery bypassed by -N option";
5048 }
5049 DEBUG(D_transport)
5050 {
5051 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5052 "*** host and remaining hosts:\n", tblock->name);
5053 for (host_item * host2 = host; host2; host2 = host2->next)
5054 debug_printf(" %s [%s]\n", host2->name,
5055 host2->address ? host2->address : US"unset");
5056 }
5057 rc = OK;
5058 }
5059
5060 /* This is for real. If the host is expired, we don't count it for
5061 hosts_max_retry. This ensures that all hosts must expire before an address
5062 is timed out, unless hosts_max_try_hardlimit (which protects against
5063 lunatic DNS configurations) is reached.
5064
5065 If the host is not expired and we are about to hit the hosts_max_retry
5066 limit, check to see if there is a subsequent hosts with a different MX
5067 value. If so, make that the next host, and don't count this one. This is a
5068 heuristic to make sure that different MXs do get tried. With a normal kind
5069 of retry rule, they would get tried anyway when the earlier hosts were
5070 delayed, but if the domain has a "retry every time" type of rule - as is
5071 often used for the the very large ISPs, that won't happen. */
5072
5073 else
5074 {
5075 host_item * thost;
5076 /* Make a copy of the host if it is local to this invocation
5077 of the transport. */
5078
5079 if (expanded_hosts)
5080 {
5081 thost = store_get(sizeof(host_item), FALSE);
5082 *thost = *host;
5083 thost->name = string_copy(host->name);
5084 thost->address = string_copy(host->address);
5085 }
5086 else
5087 thost = host;
5088
5089 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5090 {
5091 DEBUG(D_transport)
5092 debug_printf("hosts_max_try limit reached with this host\n");
5093 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5094 {
5095 nexthost = h;
5096 unexpired_hosts_tried--;
5097 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5098 "and will be tried\n");
5099 break;
5100 }
5101 }
5102
5103 /* Attempt the delivery. */
5104
5105 total_hosts_tried++;
5106 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5107 &message_defer, FALSE);
5108
5109 /* Yield is one of:
5110 OK => connection made, each address contains its result;
5111 message_defer is set for message-specific defers (when all
5112 recipients are marked defer)
5113 DEFER => there was a non-message-specific delivery problem;
5114 ERROR => there was a problem setting up the arguments for a filter,
5115 or there was a problem with expanding added headers
5116 */
5117
5118 /* If the result is not OK, there was a non-message-specific problem.
5119 If the result is DEFER, we need to write to the logs saying what happened
5120 for this particular host, except in the case of authentication and TLS
5121 failures, where the log has already been written. If all hosts defer a
5122 general message is written at the end. */
5123
5124 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5125 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5126 write_logs(host, first_addr->message, first_addr->basic_errno);
5127
5128 #ifndef DISABLE_EVENT
5129 if (rc == DEFER)
5130 deferred_event_raise(first_addr, host, US"msg:host:defer");
5131 #endif
5132
5133 /* If STARTTLS was accepted, but there was a failure in setting up the
5134 TLS session (usually a certificate screwup), and the host is not in
5135 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5136 TLS forcibly turned off. We have to start from scratch with a new SMTP
5137 connection. That's why the retry is done from here, not from within
5138 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5139 session, so the in-clear transmission after those errors, if permitted,
5140 happens inside smtp_deliver().] */
5141
5142 #ifndef DISABLE_TLS
5143 if ( rc == DEFER
5144 && first_addr->basic_errno == ERRNO_TLSFAILURE
5145 && ob->tls_tempfail_tryclear
5146 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5147 )
5148 {
5149 log_write(0, LOG_MAIN,
5150 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5151 first_addr->message, host->name, host->address);
5152 first_addr = prepare_addresses(addrlist, host);
5153 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5154 &message_defer, TRUE);
5155 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5156 write_logs(host, first_addr->message, first_addr->basic_errno);
5157 # ifndef DISABLE_EVENT
5158 if (rc == DEFER)
5159 deferred_event_raise(first_addr, host, US"msg:host:defer");
5160 # endif
5161 }
5162 #endif /*DISABLE_TLS*/
5163
5164 #ifndef DISABLE_EVENT
5165 /* If the last host gave a defer raise a per-message event */
5166
5167 if (!nexthost && (message_defer || rc == DEFER))
5168 deferred_event_raise(first_addr, host, US"msg:defer");
5169 #endif
5170 }
5171
5172 /* Delivery attempt finished */
5173
5174 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5175 message_id, host->name, host->address, pistring, addrlist->address,
5176 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5177
5178 /* Release serialization if set up */
5179
5180 if (serialize_key) enq_end(serialize_key);
5181
5182 /* If the result is DEFER, or if a host retry record is known to exist, we
5183 need to add an item to the retry chain for updating the retry database
5184 at the end of delivery. We only need to add the item to the top address,
5185 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5186 for any other delivery attempts using the same address. (It is copied into
5187 the unusable tree at the outer level, so even if different address blocks
5188 contain the same address, it still won't get tried again.) */
5189
5190 if (rc == DEFER || retry_host_key)
5191 {
5192 int delete_flag = rc != DEFER ? rf_delete : 0;
5193 if (!retry_host_key)
5194 {
5195 BOOL incl_ip;
5196 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5197 US"retry_include_ip_address", ob->retry_include_ip_address,
5198 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5199 incl_ip = TRUE; /* error; use most-specific retry record */
5200
5201 retry_host_key = incl_ip
5202 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5203 : string_sprintf("T:%S%s", host->name, pistring);
5204 }
5205
5206 /* If a delivery of another message over an existing SMTP connection
5207 yields DEFER, we do NOT set up retry data for the host. This covers the
5208 case when there are delays in routing the addresses in the second message
5209 that are so long that the server times out. This is alleviated by not
5210 routing addresses that previously had routing defers when handling an
5211 existing connection, but even so, this case may occur (e.g. if a
5212 previously happily routed address starts giving routing defers). If the
5213 host is genuinely down, another non-continued message delivery will
5214 notice it soon enough. */
5215
5216 if (delete_flag != 0 || !continue_hostname)
5217 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5218
5219 /* We may have tried an expired host, if its retry time has come; ensure
5220 the status reflects the expiry for the benefit of any other addresses. */
5221
5222 if (rc == DEFER)
5223 {
5224 host->status = host_is_expired
5225 ? hstatus_unusable_expired : hstatus_unusable;
5226 host->why = hwhy_deferred;
5227 }
5228 }
5229
5230 /* If message_defer is set (host was OK, but every recipient got deferred
5231 because of some message-specific problem), or if that had happened
5232 previously so that a message retry key exists, add an appropriate item
5233 to the retry chain. Note that if there was a message defer but now there is
5234 a host defer, the message defer record gets deleted. That seems perfectly
5235 reasonable. Also, stop the message from being remembered as waiting
5236 for specific hosts. */
5237
5238 if (message_defer || retry_message_key)
5239 {
5240 int delete_flag = message_defer ? 0 : rf_delete;
5241 if (!retry_message_key)
5242 {
5243 BOOL incl_ip;
5244 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5245 US"retry_include_ip_address", ob->retry_include_ip_address,
5246 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5247 incl_ip = TRUE; /* error; use most-specific retry record */
5248
5249 retry_message_key = incl_ip
5250 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5251 message_id)
5252 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5253 }
5254 retry_add_item(addrlist, retry_message_key,
5255 rf_message | rf_host | delete_flag);
5256 update_waiting = FALSE;
5257 }
5258
5259 /* Any return other than DEFER (that is, OK or ERROR) means that the
5260 addresses have got their final statuses filled in for this host. In the OK
5261 case, see if any of them are deferred. */
5262
5263 if (rc == OK)
5264 for (address_item * addr = addrlist; addr; addr = addr->next)
5265 if (addr->transport_return == DEFER)
5266 {
5267 some_deferred = TRUE;
5268 break;
5269 }
5270
5271 /* If no addresses deferred or the result was ERROR, return. We do this for
5272 ERROR because a failing filter set-up or add_headers expansion is likely to
5273 fail for any host we try. */
5274
5275 if (rc == ERROR || (rc == OK && !some_deferred))
5276 {
5277 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5278 return TRUE; /* Each address has its status */
5279 }
5280
5281 /* If the result was DEFER or some individual addresses deferred, let
5282 the loop run to try other hosts with the deferred addresses, except for the
5283 case when we were trying to deliver down an existing channel and failed.
5284 Don't try any other hosts in this case. */
5285
5286 if (continue_hostname) break;
5287
5288 /* If the whole delivery, or some individual addresses, were deferred and
5289 there are more hosts that could be tried, do not count this host towards
5290 the hosts_max_try limit if the age of the message is greater than the
5291 maximum retry time for this host. This means we may try try all hosts,
5292 ignoring the limit, when messages have been around for some time. This is
5293 important because if we don't try all hosts, the address will never time
5294 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5295
5296 if ((rc == DEFER || some_deferred) && nexthost)
5297 {
5298 BOOL timedout;
5299 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5300
5301 if (retry && retry->rules)
5302 {
5303 retry_rule *last_rule;
5304 for (last_rule = retry->rules;
5305 last_rule->next;
5306 last_rule = last_rule->next);
5307 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5308 }
5309 else timedout = TRUE; /* No rule => timed out */
5310
5311 if (timedout)
5312 {
5313 unexpired_hosts_tried--;
5314 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5315 "hosts_max_try (message older than host's retry time)\n");
5316 }
5317 }
5318
5319 DEBUG(D_transport)
5320 {
5321 if (unexpired_hosts_tried >= ob->hosts_max_try)
5322 debug_printf("reached transport hosts_max_try limit %d\n",
5323 ob->hosts_max_try);
5324 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5325 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5326 ob->hosts_max_try_hardlimit);
5327 }
5328
5329 testharness_pause_ms(500); /* let server debug out */
5330 } /* End of loop for trying multiple hosts. */
5331
5332 /* If we failed to find a matching host in the list, for an already-open
5333 connection, just close it and start over with the list. This can happen
5334 for routing that changes from run to run, or big multi-IP sites with
5335 round-robin DNS. */
5336
5337 if (continue_hostname && !continue_host_tried)
5338 {
5339 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5340
5341 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5342 #ifndef DISABLE_TLS
5343 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5344 transport */
5345 /*XXX doublecheck that! */
5346
5347 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5348 {
5349 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5350 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5351 cutthrough.cctx.tls_ctx = NULL;
5352 cutthrough.is_tls = FALSE;
5353 }
5354 else
5355 #else
5356 (void) write(fd, US"QUIT\r\n", 6);
5357 #endif
5358 (void) close(fd);
5359 cutthrough.cctx.sock = -1;
5360 continue_hostname = NULL;
5361 goto retry_non_continued;
5362 }
5363
5364 /* This is the end of the loop that repeats iff expired is TRUE and
5365 ob->delay_after_cutoff is FALSE. The second time round we will
5366 try those hosts that haven't been tried since the message arrived. */
5367
5368 DEBUG(D_transport)
5369 {
5370 debug_printf("all IP addresses skipped or deferred at least one address\n");
5371 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5372 debug_printf("retrying IP addresses not tried since message arrived\n");
5373 }
5374 }
5375
5376
5377 /* Get here if all IP addresses are skipped or defer at least one address. In
5378 MUA wrapper mode, this will happen only for connection or other non-message-
5379 specific failures. Force the delivery status for all addresses to FAIL. */
5380
5381 if (mua_wrapper)
5382 {
5383 for (address_item * addr = addrlist; addr; addr = addr->next)
5384 addr->transport_return = FAIL;
5385 goto END_TRANSPORT;
5386 }
5387
5388 /* In the normal, non-wrapper case, add a standard message to each deferred
5389 address if there hasn't been an error, that is, if it hasn't actually been
5390 tried this time. The variable "expired" will be FALSE if any deliveries were
5391 actually tried, or if there was at least one host that was not expired. That
5392 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5393 a delivery has been tried, an error code will be set, and the failing of the
5394 message is handled by the retry code later.
5395
5396 If queue_smtp is set, or this transport was called to send a subsequent message
5397 down an existing TCP/IP connection, and something caused the host not to be
5398 found, we end up here, but can detect these cases and handle them specially. */
5399
5400 for (address_item * addr = addrlist; addr; addr = addr->next)
5401 {
5402 /* If host is not NULL, it means that we stopped processing the host list
5403 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5404 means we need to behave as if some hosts were skipped because their retry
5405 time had not come. Specifically, this prevents the address from timing out.
5406 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5407 hosts were tried. */
5408
5409 if (host)
5410 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5411 {
5412 DEBUG(D_transport)
5413 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5414 "hosts were tried\n");
5415 }
5416 else
5417 {
5418 DEBUG(D_transport)
5419 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5420 setflag(addr, af_retry_skipped);
5421 }
5422
5423 if (f.queue_smtp) /* no deliveries attempted */
5424 {
5425 addr->transport_return = DEFER;
5426 addr->basic_errno = 0;
5427 addr->message = US"SMTP delivery explicitly queued";
5428 }
5429
5430 else if ( addr->transport_return == DEFER
5431 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5432 && !addr->message
5433 )
5434 {
5435 addr->basic_errno = ERRNO_HRETRY;
5436 if (continue_hostname)
5437 addr->message = US"no host found for existing SMTP connection";
5438 else if (expired)
5439 {
5440 setflag(addr, af_pass_message); /* This is not a security risk */
5441 addr->message = string_sprintf(
5442 "all hosts%s have been failing for a long time %s",
5443 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5444 ob->delay_after_cutoff
5445 ? US"(and retry time not reached)"
5446 : US"and were last tried after this message arrived");
5447
5448 /* If we are already using fallback hosts, or there are no fallback hosts
5449 defined, convert the result to FAIL to cause a bounce. */
5450
5451 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5452 addr->transport_return = FAIL;
5453 }
5454 else
5455 {
5456 const char * s;
5457 if (hosts_retry == hosts_total)
5458 s = "retry time not reached for any host%s";
5459 else if (hosts_fail == hosts_total)
5460 s = "all host address lookups%s failed permanently";
5461 else if (hosts_defer == hosts_total)
5462 s = "all host address lookups%s failed temporarily";
5463 else if (hosts_serial == hosts_total)
5464 s = "connection limit reached for all hosts%s";
5465 else if (hosts_fail+hosts_defer == hosts_total)
5466 s = "all host address lookups%s failed";
5467 else
5468 s = "some host address lookups failed and retry time "
5469 "not reached for other hosts or connection limit reached%s";
5470
5471 addr->message = string_sprintf(s,
5472 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5473 }
5474 }
5475 }
5476
5477 /* Update the database which keeps information about which messages are waiting
5478 for which hosts to become available. For some message-specific errors, the
5479 update_waiting flag is turned off because we don't want follow-on deliveries in
5480 those cases. If this transport instance is explicitly limited to one message
5481 per connection then follow-on deliveries are not possible and there's no need
5482 to create/update the per-transport wait-<transport_name> database. */
5483
5484 if (update_waiting && tblock->connection_max_messages != 1)
5485 transport_update_waiting(hostlist, tblock->name);
5486
5487 END_TRANSPORT:
5488
5489 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5490
5491 return TRUE; /* Each address has its status */
5492 }
5493
5494 #endif /*!MACRO_PREDEF*/
5495 /* vi: aw ai sw=2
5496 */
5497 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.