projects / exim.git / blob
? search:


a3f0351e374d966edb76b5f8ae72e06390092568
[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 uschar * s;
915 for (int sep = ' '; s = string_nextinlist(&list, &sep, NULL, 0); )
916 if (strcmpic(au->public_name, s) == 0)
917 { authbits |= BIT(authnum); break; }
918 }
919
920 DEBUG(D_transport)
921 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
922 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
923
924 if (tls_out.active.sock >= 0)
925 sx->ehlo_resp.crypted_auths = authbits;
926 else
927 sx->ehlo_resp.cleartext_auths = authbits;
928 return authbits;
929 }
930
931
932
933
934 /* Wait for and check responses for early-pipelining.
935
936 Called from the lower-level smtp_read_response() function
937 used for general code that assume synchronisation, if context
938 flags indicate outstanding early-pipelining commands. Also
939 called fom sync_responses() which handles pipelined commands.
940
941 Arguments:
942 sx smtp connection context
943 countp number of outstanding responses, adjusted on return
944
945 Return:
946 OK all well
947 DEFER error on first read of TLS'd conn
948 FAIL SMTP error in response
949 */
950 int
951 smtp_reap_early_pipe(smtp_context * sx, int * countp)
952 {
953 BOOL pending_BANNER = sx->pending_BANNER;
954 BOOL pending_EHLO = sx->pending_EHLO;
955 int rc = FAIL;
956
957 sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
958 sx->pending_EHLO = FALSE;
959
960 if (pending_BANNER)
961 {
962 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
963 (*countp)--;
964 if (!smtp_reap_banner(sx))
965 {
966 DEBUG(D_transport) debug_printf("bad banner\n");
967 if (tls_out.active.sock >= 0) rc = DEFER;
968 goto fail;
969 }
970 }
971
972 if (pending_EHLO)
973 {
974 unsigned peer_offered;
975 unsigned short authbits = 0, * ap;
976
977 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
978 (*countp)--;
979 if (!smtp_reap_ehlo(sx))
980 {
981 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
982 if (tls_out.active.sock >= 0) rc = DEFER;
983 goto fail;
984 }
985
986 /* Compare the actual EHLO response to the cached value we assumed;
987 on difference, dump or rewrite the cache and arrange for a retry. */
988
989 ap = tls_out.active.sock < 0
990 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
991
992 peer_offered = ehlo_response(sx->buffer,
993 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
994 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
995 | OPTION_UTF8 | OPTION_EARLY_PIPE
996 );
997 if ( peer_offered != sx->peer_offered
998 || (authbits = study_ehlo_auths(sx)) != *ap)
999 {
1000 HDEBUG(D_transport)
1001 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1002 tls_out.active.sock < 0 ? "cleartext" : "crypted",
1003 sx->peer_offered, *ap, peer_offered, authbits);
1004 *(tls_out.active.sock < 0
1005 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
1006 *ap = authbits;
1007 if (peer_offered & OPTION_EARLY_PIPE)
1008 write_ehlo_cache_entry(sx);
1009 else
1010 invalidate_ehlo_cache_entry(sx);
1011
1012 return OK; /* just carry on */
1013 }
1014 }
1015 return OK;
1016
1017 fail:
1018 invalidate_ehlo_cache_entry(sx);
1019 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
1020 return rc;
1021 }
1022 #endif
1023
1024
1025 /*************************************************
1026 * Synchronize SMTP responses *
1027 *************************************************/
1028
1029 /* This function is called from smtp_deliver() to receive SMTP responses from
1030 the server, and match them up with the commands to which they relate. When
1031 PIPELINING is not in use, this function is called after every command, and is
1032 therefore somewhat over-engineered, but it is simpler to use a single scheme
1033 that works both with and without PIPELINING instead of having two separate sets
1034 of code.
1035
1036 The set of commands that are buffered up with pipelining may start with MAIL
1037 and may end with DATA; in between are RCPT commands that correspond to the
1038 addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1039 etc.) are never buffered.
1040
1041 Errors after MAIL or DATA abort the whole process leaving the response in the
1042 buffer. After MAIL, pending responses are flushed, and the original command is
1043 re-instated in big_buffer for error messages. For RCPT commands, the remote is
1044 permitted to reject some recipient addresses while accepting others. However
1045 certain errors clearly abort the whole process. Set the value in
1046 transport_return to PENDING_OK if the address is accepted. If there is a
1047 subsequent general error, it will get reset accordingly. If not, it will get
1048 converted to OK at the end.
1049
1050 Arguments:
1051 sx smtp connection context
1052 count the number of responses to read
1053 pending_DATA 0 if last command sent was not DATA
1054 +1 if previously had a good recipient
1055 -1 if not previously had a good recipient
1056
1057 Returns: 3 if at least one address had 2xx and one had 5xx
1058 2 if at least one address had 5xx but none had 2xx
1059 1 if at least one host had a 2xx response, but none had 5xx
1060 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1061 -1 timeout while reading RCPT response
1062 -2 I/O or other non-response error for RCPT
1063 -3 DATA or MAIL failed - errno and buffer set
1064 -4 banner or EHLO failed (early-pipelining)
1065 -5 banner or EHLO failed (early-pipelining, TLS)
1066 */
1067
1068 static int
1069 sync_responses(smtp_context * sx, int count, int pending_DATA)
1070 {
1071 address_item * addr = sx->sync_addr;
1072 smtp_transport_options_block * ob = sx->conn_args.ob;
1073 int yield = 0;
1074
1075 #ifndef DISABLE_PIPE_CONNECT
1076 int rc;
1077 if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1078 return rc == FAIL ? -4 : -5;
1079 #endif
1080
1081 /* Handle the response for a MAIL command. On error, reinstate the original
1082 command in big_buffer for error message use, and flush any further pending
1083 responses before returning, except after I/O errors and timeouts. */
1084
1085 if (sx->pending_MAIL)
1086 {
1087 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
1088 count--;
1089 sx->pending_MAIL = FALSE;
1090 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1091 '2', ob->command_timeout))
1092 {
1093 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
1094 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
1095 if (errno == ERRNO_TLSFAILURE)
1096 return -5;
1097 if (errno == 0 && sx->buffer[0] != 0)
1098 {
1099 int save_errno = 0;
1100 if (sx->buffer[0] == '4')
1101 {
1102 save_errno = ERRNO_MAIL4XX;
1103 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1104 }
1105 count = smtp_discard_responses(sx, ob, count);
1106 errno = save_errno;
1107 }
1108
1109 if (pending_DATA) count--; /* Number of RCPT responses to come */
1110 while (count-- > 0) /* Mark any pending addrs with the host used */
1111 {
1112 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
1113 addr->host_used = sx->conn_args.host;
1114 addr = addr->next;
1115 }
1116 return -3;
1117 }
1118 }
1119
1120 if (pending_DATA) count--; /* Number of RCPT responses to come */
1121
1122 /* Read and handle the required number of RCPT responses, matching each one up
1123 with an address by scanning for the next address whose status is PENDING_DEFER.
1124 */
1125
1126 while (count-- > 0)
1127 {
1128 while (addr->transport_return != PENDING_DEFER)
1129 if (!(addr = addr->next))
1130 return -2;
1131
1132 /* The address was accepted */
1133 addr->host_used = sx->conn_args.host;
1134
1135 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
1136 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1137 '2', ob->command_timeout))
1138 {
1139 yield |= 1;
1140 addr->transport_return = PENDING_OK;
1141
1142 /* If af_dr_retry_exists is set, there was a routing delay on this address;
1143 ensure that any address-specific retry record is expunged. We do this both
1144 for the basic key and for the version that also includes the sender. */
1145
1146 if (testflag(addr, af_dr_retry_exists))
1147 {
1148 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1149 sender_address);
1150 retry_add_item(addr, altkey, rf_delete);
1151 retry_add_item(addr, addr->address_retry_key, rf_delete);
1152 }
1153 }
1154
1155 /* Error on first TLS read */
1156
1157 else if (errno == ERRNO_TLSFAILURE)
1158 return -5;
1159
1160 /* Timeout while reading the response */
1161
1162 else if (errno == ETIMEDOUT)
1163 {
1164 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
1165 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1166 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
1167 retry_add_item(addr, addr->address_retry_key, 0);
1168 update_waiting = FALSE;
1169 return -1;
1170 }
1171
1172 /* Handle other errors in obtaining an SMTP response by returning -1. This
1173 will cause all the addresses to be deferred. Restore the SMTP command in
1174 big_buffer for which we are checking the response, so the error message
1175 makes sense. */
1176
1177 else if (errno != 0 || sx->buffer[0] == 0)
1178 {
1179 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1180
1181 /* Use taint-unchecked routines for writing into big_buffer, trusting
1182 that we'll never expand it. */
1183
1184 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
1185 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
1186 string_from_gstring(g);
1187 return -2;
1188 }
1189
1190 /* Handle SMTP permanent and temporary response codes. */
1191
1192 else
1193 {
1194 addr->message =
1195 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
1196 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
1197 string_printing(sx->buffer));
1198 setflag(addr, af_pass_message);
1199 if (!sx->verify)
1200 msglog_line(sx->conn_args.host, addr->message);
1201
1202 /* The response was 5xx */
1203
1204 if (sx->buffer[0] == '5')
1205 {
1206 addr->transport_return = FAIL;
1207 yield |= 2;
1208 }
1209
1210 /* The response was 4xx */
1211
1212 else
1213 {
1214 addr->transport_return = DEFER;
1215 addr->basic_errno = ERRNO_RCPT4XX;
1216 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1217
1218 if (!sx->verify)
1219 {
1220 #ifndef DISABLE_EVENT
1221 event_defer_errno = addr->more_errno;
1222 msg_event_raise(US"msg:rcpt:host:defer", addr);
1223 #endif
1224 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1225 start point for another MAIL command. */
1226
1227 if (addr->more_errno >> 8 == 52 && yield & 3)
1228 {
1229 if (!sx->RCPT_452)
1230 {
1231 DEBUG(D_transport)
1232 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1233 sx->RCPT_452 = TRUE;
1234 sx->next_addr = addr;
1235 }
1236 addr->transport_return = PENDING_DEFER;
1237 addr->basic_errno = 0;
1238 }
1239 else
1240 {
1241 /* Log temporary errors if there are more hosts to be tried.
1242 If not, log this last one in the == line. */
1243
1244 if (sx->conn_args.host->next)
1245 if (LOGGING(outgoing_port))
1246 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1247 sx->conn_args.host->address,
1248 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1249 else
1250 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1251 sx->conn_args.host->address, addr->message);
1252
1253 #ifndef DISABLE_EVENT
1254 else
1255 msg_event_raise(US"msg:rcpt:defer", addr);
1256 #endif
1257
1258 /* Do not put this message on the list of those waiting for specific
1259 hosts, as otherwise it is likely to be tried too often. */
1260
1261 update_waiting = FALSE;
1262
1263 /* Add a retry item for the address so that it doesn't get tried again
1264 too soon. If address_retry_include_sender is true, add the sender address
1265 to the retry key. */
1266
1267 retry_add_item(addr,
1268 ob->address_retry_include_sender
1269 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1270 : addr->address_retry_key,
1271 0);
1272 }
1273 }
1274 }
1275 }
1276 } /* Loop for next RCPT response */
1277
1278 /* Update where to start at for the next block of responses, unless we
1279 have already handled all the addresses. */
1280
1281 if (addr) sx->sync_addr = addr->next;
1282
1283 /* Handle a response to DATA. If we have not had any good recipients, either
1284 previously or in this block, the response is ignored. */
1285
1286 if (pending_DATA != 0)
1287 {
1288 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
1289 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
1290 '3', ob->command_timeout))
1291 {
1292 int code;
1293 uschar *msg;
1294 BOOL pass_message;
1295
1296 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1297 return -5;
1298
1299 if (pending_DATA > 0 || (yield & 1) != 0)
1300 {
1301 if (errno == 0 && sx->buffer[0] == '4')
1302 {
1303 errno = ERRNO_DATA4XX;
1304 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1305 }
1306 return -3;
1307 }
1308 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
1309 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1310 "is in use and there were no good recipients\n", msg);
1311 }
1312 }
1313
1314 /* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1315 present) received 3xx. If any RCPTs were handled and yielded anything other
1316 than 4xx, yield will be set non-zero. */
1317
1318 return yield;
1319 }
1320
1321
1322
1323
1324
1325 /* Try an authenticator's client entry */
1326
1327 static int
1328 try_authenticator(smtp_context * sx, auth_instance * au)
1329 {
1330 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1331 host_item * host = sx->conn_args.host; /* host to deliver to */
1332 int rc;
1333
1334 sx->outblock.authenticating = TRUE;
1335 rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1336 sx->buffer, sizeof(sx->buffer));
1337 sx->outblock.authenticating = FALSE;
1338 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1339
1340 /* A temporary authentication failure must hold up delivery to
1341 this host. After a permanent authentication failure, we carry on
1342 to try other authentication methods. If all fail hard, try to
1343 deliver the message unauthenticated unless require_auth was set. */
1344
1345 switch(rc)
1346 {
1347 case OK:
1348 f.smtp_authenticated = TRUE; /* stops the outer loop */
1349 client_authenticator = au->name;
1350 if (au->set_client_id)
1351 client_authenticated_id = expand_string(au->set_client_id);
1352 break;
1353
1354 /* Failure after writing a command */
1355
1356 case FAIL_SEND:
1357 return FAIL_SEND;
1358
1359 /* Failure after reading a response */
1360
1361 case FAIL:
1362 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1363 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1364 au->name, host->name, host->address, sx->buffer);
1365 break;
1366
1367 /* Failure by some other means. In effect, the authenticator
1368 decided it wasn't prepared to handle this case. Typically this
1369 is the result of "fail" in an expansion string. Do we need to
1370 log anything here? Feb 2006: a message is now put in the buffer
1371 if logging is required. */
1372
1373 case CANCELLED:
1374 if (*sx->buffer != 0)
1375 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1376 "authentication H=%s [%s] %s", au->name, host->name,
1377 host->address, sx->buffer);
1378 break;
1379
1380 /* Internal problem, message in buffer. */
1381
1382 case ERROR:
1383 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
1384 DEFER, FALSE, &sx->delivery_start);
1385 return ERROR;
1386 }
1387 return OK;
1388 }
1389
1390
1391
1392
1393 /* Do the client side of smtp-level authentication.
1394
1395 Arguments:
1396 sx smtp connection context
1397
1398 sx->buffer should have the EHLO response from server (gets overwritten)
1399
1400 Returns:
1401 OK Success, or failed (but not required): global "smtp_authenticated" set
1402 DEFER Failed authentication (and was required)
1403 ERROR Internal problem
1404
1405 FAIL_SEND Failed communications - transmit
1406 FAIL - response
1407 */
1408
1409 static int
1410 smtp_auth(smtp_context * sx)
1411 {
1412 host_item * host = sx->conn_args.host; /* host to deliver to */
1413 smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1414 int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
1415 #ifndef DISABLE_PIPE_CONNECT
1416 unsigned short authbits = tls_out.active.sock >= 0
1417 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1418 #endif
1419 uschar * fail_reason = US"server did not advertise AUTH support";
1420
1421 f.smtp_authenticated = FALSE;
1422 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
1423
1424 if (!regex_AUTH)
1425 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1426
1427 /* Is the server offering AUTH? */
1428
1429 if ( sx->esmtp
1430 &&
1431 #ifndef DISABLE_PIPE_CONNECT
1432 sx->early_pipe_active ? authbits
1433 :
1434 #endif
1435 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1436 )
1437 {
1438 uschar * names = NULL;
1439 expand_nmax = -1; /* reset */
1440
1441 #ifndef DISABLE_PIPE_CONNECT
1442 if (!sx->early_pipe_active)
1443 #endif
1444 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1445
1446 /* Must not do this check until after we have saved the result of the
1447 regex match above as the check could be another RE. */
1448
1449 if ( require_auth == OK
1450 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
1451 {
1452 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
1453 fail_reason = US"no common mechanisms were found";
1454
1455 #ifndef DISABLE_PIPE_CONNECT
1456 if (sx->early_pipe_active)
1457 {
1458 /* Scan our authenticators (which support use by a client and were offered
1459 by the server (checked at cache-write time)), not suppressed by
1460 client_condition. If one is found, attempt to authenticate by calling its
1461 client function. We are limited to supporting up to 16 authenticator
1462 public-names by the number of bits in a short. */
1463
1464 auth_instance * au;
1465 uschar bitnum;
1466 int rc;
1467
1468 for (bitnum = 0, au = auths;
1469 !f.smtp_authenticated && au && bitnum < 16;
1470 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1471 {
1472 if ( au->client_condition
1473 && !expand_check_condition(au->client_condition, au->name,
1474 US"client authenticator"))
1475 {
1476 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1477 au->name, "client_condition is false");
1478 continue;
1479 }
1480
1481 /* Found data for a listed mechanism. Call its client entry. Set
1482 a flag in the outblock so that data is overwritten after sending so
1483 that reflections don't show it. */
1484
1485 fail_reason = US"authentication attempt(s) failed";
1486
1487 if ((rc = try_authenticator(sx, au)) != OK)
1488 return rc;
1489 }
1490 }
1491 else
1492 #endif
1493
1494 /* Scan the configured authenticators looking for one which is configured
1495 for use as a client, which is not suppressed by client_condition, and
1496 whose name matches an authentication mechanism supported by the server.
1497 If one is found, attempt to authenticate by calling its client function.
1498 */
1499
1500 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
1501 {
1502 uschar *p = names;
1503
1504 if ( !au->client
1505 || ( au->client_condition
1506 && !expand_check_condition(au->client_condition, au->name,
1507 US"client authenticator")))
1508 {
1509 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1510 au->name,
1511 (au->client)? "client_condition is false" :
1512 "not configured as a client");
1513 continue;
1514 }
1515
1516 /* Loop to scan supported server mechanisms */
1517
1518 while (*p)
1519 {
1520 int len = Ustrlen(au->public_name);
1521 int rc;
1522
1523 while (isspace(*p)) p++;
1524
1525 if (strncmpic(au->public_name, p, len) != 0 ||
1526 (p[len] != 0 && !isspace(p[len])))
1527 {
1528 while (*p != 0 && !isspace(*p)) p++;
1529 continue;
1530 }
1531
1532 /* Found data for a listed mechanism. Call its client entry. Set
1533 a flag in the outblock so that data is overwritten after sending so
1534 that reflections don't show it. */
1535
1536 fail_reason = US"authentication attempt(s) failed";
1537
1538 if ((rc = try_authenticator(sx, au)) != OK)
1539 return rc;
1540
1541 break; /* If not authenticated, try next authenticator */
1542 } /* Loop for scanning supported server mechanisms */
1543 } /* Loop for further authenticators */
1544 }
1545 }
1546
1547 /* If we haven't authenticated, but are required to, give up. */
1548
1549 if (require_auth == OK && !f.smtp_authenticated)
1550 {
1551 invalidate_ehlo_cache_entry(sx);
1552 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
1553 string_sprintf("authentication required but %s", fail_reason), DEFER,
1554 FALSE, &sx->delivery_start);
1555 return DEFER;
1556 }
1557
1558 return OK;
1559 }
1560
1561
1562 /* Construct AUTH appendix string for MAIL TO */
1563 /*
1564 Arguments
1565 sx context for smtp connection
1566 p point in sx->buffer to build string
1567 addrlist chain of potential addresses to deliver
1568
1569 Globals f.smtp_authenticated
1570 client_authenticated_sender
1571 Return True on error, otherwise buffer has (possibly empty) terminated string
1572 */
1573
1574 static BOOL
1575 smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
1576 {
1577 smtp_transport_options_block * ob = sx->conn_args.ob;
1578 uschar * local_authenticated_sender = authenticated_sender;
1579
1580 #ifdef notdef
1581 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1582 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
1583 #endif
1584
1585 if (ob->authenticated_sender)
1586 {
1587 uschar * new = expand_string(ob->authenticated_sender);
1588 if (!new)
1589 {
1590 if (!f.expand_string_forcedfail)
1591 {
1592 uschar *message = string_sprintf("failed to expand "
1593 "authenticated_sender: %s", expand_string_message);
1594 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
1595 return TRUE;
1596 }
1597 }
1598 else if (*new)
1599 local_authenticated_sender = new;
1600 }
1601
1602 /* Add the authenticated sender address if present */
1603
1604 if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1605 && local_authenticated_sender)
1606 {
1607 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
1608 auth_xtextencode(local_authenticated_sender,
1609 Ustrlen(local_authenticated_sender)));
1610 client_authenticated_sender = string_copy(local_authenticated_sender);
1611 }
1612 else
1613 *p = 0;
1614
1615 return FALSE;
1616 }
1617
1618
1619
1620 typedef struct smtp_compare_s
1621 {
1622 uschar *current_sender_address;
1623 struct transport_instance *tblock;
1624 } smtp_compare_t;
1625
1626
1627 /* Create a unique string that identifies this message, it is based on
1628 sender_address, helo_data and tls_certificate if enabled.
1629 */
1630
1631 static uschar *
1632 smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1633 {
1634 address_item * addr1;
1635 uschar * if1 = US"";
1636 uschar * helo1 = US"";
1637 #ifndef DISABLE_TLS
1638 uschar * tlsc1 = US"";
1639 #endif
1640 uschar * save_sender_address = sender_address;
1641 uschar * local_identity = NULL;
1642 smtp_transport_options_block * ob = SOB tblock->options_block;
1643
1644 sender_address = sender;
1645
1646 addr1 = deliver_make_addr (sender, TRUE);
1647 deliver_set_expansions(addr1);
1648
1649 if (ob->interface)
1650 if1 = expand_string(ob->interface);
1651
1652 if (ob->helo_data)
1653 helo1 = expand_string(ob->helo_data);
1654
1655 #ifndef DISABLE_TLS
1656 if (ob->tls_certificate)
1657 tlsc1 = expand_string(ob->tls_certificate);
1658 local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1659 #else
1660 local_identity = string_sprintf ("%s^%s", if1, helo1);
1661 #endif
1662
1663 deliver_set_expansions(NULL);
1664 sender_address = save_sender_address;
1665
1666 return local_identity;
1667 }
1668
1669
1670
1671 /* This routine is a callback that is called from transport_check_waiting.
1672 This function will evaluate the incoming message versus the previous
1673 message. If the incoming message is using a different local identity then
1674 we will veto this new message. */
1675
1676 static BOOL
1677 smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1678 {
1679 uschar * message_local_identity,
1680 * current_local_identity,
1681 * new_sender_address;
1682
1683 current_local_identity =
1684 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1685
1686 if (!(new_sender_address = deliver_get_sender_address(message_id)))
1687 return FALSE;
1688
1689 message_local_identity =
1690 smtp_local_identity(new_sender_address, s_compare->tblock);
1691
1692 return Ustrcmp(current_local_identity, message_local_identity) == 0;
1693 }
1694
1695
1696
1697 static unsigned
1698 ehlo_response(uschar * buf, unsigned checks)
1699 {
1700 size_t bsize = Ustrlen(buf);
1701
1702 /* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
1703
1704 #ifndef DISABLE_TLS
1705 if ( checks & OPTION_TLS
1706 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1707 #endif
1708 checks &= ~OPTION_TLS;
1709
1710 if ( checks & OPTION_IGNQ
1711 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1712 PCRE_EOPT, NULL, 0) < 0)
1713 checks &= ~OPTION_IGNQ;
1714
1715 if ( checks & OPTION_CHUNKING
1716 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1717 checks &= ~OPTION_CHUNKING;
1718
1719 #ifndef DISABLE_PRDR
1720 if ( checks & OPTION_PRDR
1721 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1722 #endif
1723 checks &= ~OPTION_PRDR;
1724
1725 #ifdef SUPPORT_I18N
1726 if ( checks & OPTION_UTF8
1727 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1728 #endif
1729 checks &= ~OPTION_UTF8;
1730
1731 if ( checks & OPTION_DSN
1732 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1733 checks &= ~OPTION_DSN;
1734
1735 if ( checks & OPTION_PIPE
1736 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1737 PCRE_EOPT, NULL, 0) < 0)
1738 checks &= ~OPTION_PIPE;
1739
1740 if ( checks & OPTION_SIZE
1741 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1742 checks &= ~OPTION_SIZE;
1743
1744 #ifndef DISABLE_PIPE_CONNECT
1745 if ( checks & OPTION_EARLY_PIPE
1746 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1747 PCRE_EOPT, NULL, 0) < 0)
1748 #endif
1749 checks &= ~OPTION_EARLY_PIPE;
1750
1751 /* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
1752 return checks;
1753 }
1754
1755
1756
1757 /* Callback for emitting a BDAT data chunk header.
1758
1759 If given a nonzero size, first flush any buffered SMTP commands
1760 then emit the command.
1761
1762 Reap previous SMTP command responses if requested, and always reap
1763 the response from a previous BDAT command.
1764
1765 Args:
1766 tctx transport context
1767 chunk_size value for SMTP BDAT command
1768 flags
1769 tc_chunk_last add LAST option to SMTP BDAT command
1770 tc_reap_prev reap response to previous SMTP commands
1771
1772 Returns:
1773 OK or ERROR
1774 DEFER TLS error on first read (EHLO-resp); errno set
1775 */
1776
1777 static int
1778 smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1779 unsigned flags)
1780 {
1781 smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
1782 smtp_context * sx = tctx->smtp_context;
1783 int cmd_count = 0;
1784 int prev_cmd_count;
1785
1786 /* Write SMTP chunk header command. If not reaping responses, note that
1787 there may be more writes (like, the chunk data) done soon. */
1788
1789 if (chunk_size > 0)
1790 {
1791 #ifndef DISABLE_PIPE_CONNECT
1792 BOOL new_conn = !!(sx->outblock.conn_args);
1793 #endif
1794 if((cmd_count = smtp_write_command(sx,
1795 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1796 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
1797 ) < 0) return ERROR;
1798 if (flags & tc_chunk_last)
1799 data_command = string_copy(big_buffer); /* Save for later error message */
1800 #ifndef DISABLE_PIPE_CONNECT
1801 /* That command write could have been the one that made the connection.
1802 Copy the fd from the client conn ctx (smtp transport specific) to the
1803 generic transport ctx. */
1804
1805 if (new_conn)
1806 tctx->u.fd = sx->outblock.cctx->sock;
1807 #endif
1808 }
1809
1810 prev_cmd_count = cmd_count += sx->cmd_count;
1811
1812 /* Reap responses for any previous, but not one we just emitted */
1813
1814 if (chunk_size > 0)
1815 prev_cmd_count--;
1816 if (sx->pending_BDAT)
1817 prev_cmd_count--;
1818
1819 if (flags & tc_reap_prev && prev_cmd_count > 0)
1820 {
1821 DEBUG(D_transport) debug_printf("look for %d responses"
1822 " for previous pipelined cmds\n", prev_cmd_count);
1823
1824 switch(sync_responses(sx, prev_cmd_count, 0))
1825 {
1826 case 1: /* 2xx (only) => OK */
1827 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1828 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
1829 case 0: break; /* No 2xx or 5xx, but no probs */
1830
1831 case -5: errno = ERRNO_TLSFAILURE;
1832 return DEFER;
1833 #ifndef DISABLE_PIPE_CONNECT
1834 case -4: /* non-2xx for pipelined banner or EHLO */
1835 #endif
1836 case -1: /* Timeout on RCPT */
1837 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1838 }
1839 cmd_count = 1;
1840 if (!sx->pending_BDAT)
1841 pipelining_active = FALSE;
1842 }
1843
1844 /* Reap response for an outstanding BDAT */
1845
1846 if (sx->pending_BDAT)
1847 {
1848 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1849
1850 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
1851 ob->command_timeout))
1852 {
1853 if (errno == 0 && sx->buffer[0] == '4')
1854 {
1855 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
1856 sx->addrlist->more_errno |=
1857 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1858 }
1859 return ERROR;
1860 }
1861 cmd_count--;
1862 sx->pending_BDAT = FALSE;
1863 pipelining_active = FALSE;
1864 }
1865 else if (chunk_size > 0)
1866 sx->pending_BDAT = TRUE;
1867
1868
1869 sx->cmd_count = cmd_count;
1870 return OK;
1871 }
1872
1873
1874
1875
1876
1877 /*************************************************
1878 * Make connection for given message *
1879 *************************************************/
1880
1881 /*
1882 Arguments:
1883 ctx connection context
1884 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1885 a second attempt after TLS initialization fails
1886
1887 Returns: OK - the connection was made and the delivery attempted;
1888 fd is set in the conn context, tls_out set up.
1889 DEFER - the connection could not be made, or something failed
1890 while setting up the SMTP session, or there was a
1891 non-message-specific error, such as a timeout.
1892 ERROR - helo_data or add_headers or authenticated_sender is
1893 specified for this transport, and the string failed
1894 to expand
1895 */
1896 int
1897 smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
1898 {
1899 smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
1900 BOOL pass_message = FALSE;
1901 uschar * message = NULL;
1902 int yield = OK;
1903 #ifndef DISABLE_TLS
1904 uschar * tls_errstr;
1905 #endif
1906
1907 sx->conn_args.ob = ob;
1908
1909 sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1910 sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
1911 /* sx->ok = FALSE; */
1912 sx->send_rset = TRUE;
1913 sx->send_quit = TRUE;
1914 sx->setting_up = TRUE;
1915 sx->esmtp = TRUE;
1916 /* sx->esmtp_sent = FALSE; */
1917 #ifdef SUPPORT_I18N
1918 /* sx->utf8_needed = FALSE; */
1919 #endif
1920 sx->dsn_all_lasthop = TRUE;
1921 #ifdef SUPPORT_DANE
1922 /* sx->conn_args.dane = FALSE; */
1923 sx->dane_required =
1924 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1925 #endif
1926 #ifndef DISABLE_PIPE_CONNECT
1927 /* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1928 /* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1929 /* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
1930 #endif
1931
1932 if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
1933 /* sx->peer_offered = 0; */
1934 /* sx->avoid_option = 0; */
1935 sx->igquotstr = US"";
1936 if (!sx->helo_data) sx->helo_data = ob->helo_data;
1937 #ifdef EXPERIMENTAL_DSN_INFO
1938 /* sx->smtp_greeting = NULL; */
1939 /* sx->helo_response = NULL; */
1940 #endif
1941
1942 smtp_command = US"initial connection";
1943 /* sx->buffer[0] = '\0'; */
1944
1945 /* Set up the buffer for reading SMTP response packets. */
1946
1947 sx->inblock.buffer = sx->inbuffer;
1948 sx->inblock.buffersize = sizeof(sx->inbuffer);
1949 sx->inblock.ptr = sx->inbuffer;
1950 sx->inblock.ptrend = sx->inbuffer;
1951
1952 /* Set up the buffer for holding SMTP commands while pipelining */
1953
1954 sx->outblock.buffer = sx->outbuffer;
1955 sx->outblock.buffersize = sizeof(sx->outbuffer);
1956 sx->outblock.ptr = sx->outbuffer;
1957 /* sx->outblock.cmd_count = 0; */
1958 /* sx->outblock.authenticating = FALSE; */
1959 /* sx->outblock.conn_args = NULL; */
1960
1961 /* Reset the parameters of a TLS session. */
1962
1963 tls_out.bits = 0;
1964 tls_out.cipher = NULL; /* the one we may use for this transport */
1965 tls_out.ourcert = NULL;
1966 tls_out.peercert = NULL;
1967 tls_out.peerdn = NULL;
1968 #ifdef USE_OPENSSL
1969 tls_out.sni = NULL;
1970 #endif
1971 tls_out.ocsp = OCSP_NOT_REQ;
1972 #ifdef EXPERIMENTAL_TLS_RESUME
1973 tls_out.resumption = 0;
1974 #endif
1975 tls_out.ver = NULL;
1976
1977 /* Flip the legacy TLS-related variables over to the outbound set in case
1978 they're used in the context of the transport. Don't bother resetting
1979 afterward (when being used by a transport) as we're in a subprocess.
1980 For verify, unflipped once the callout is dealt with */
1981
1982 tls_modify_variables(&tls_out);
1983
1984 #ifdef DISABLE_TLS
1985 if (sx->smtps)
1986 {
1987 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1988 DEFER, FALSE, &sx->delivery_start);
1989 return ERROR;
1990 }
1991 #endif
1992
1993 /* Make a connection to the host if this isn't a continued delivery, and handle
1994 the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1995 specially so they can be identified for retries. */
1996
1997 if (!continue_hostname)
1998 {
1999 if (sx->verify)
2000 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
2001
2002 /* Get the actual port the connection will use, into sx->conn_args.host */
2003
2004 smtp_port_for_connect(sx->conn_args.host, sx->port);
2005
2006 #ifdef SUPPORT_DANE
2007 /* Do TLSA lookup for DANE */
2008 {
2009 tls_out.dane_verified = FALSE;
2010 tls_out.tlsa_usage = 0;
2011
2012 if (sx->conn_args.host->dnssec == DS_YES)
2013 {
2014 int rc;
2015 if( sx->dane_required
2016 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
2017 )
2018 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
2019 {
2020 case OK: sx->conn_args.dane = TRUE;
2021 ob->tls_tempfail_tryclear = FALSE;
2022 break;
2023 case FAIL_FORCED: break;
2024 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2025 string_sprintf("DANE error: tlsa lookup %s",
2026 rc_to_string(rc)),
2027 rc, FALSE, &sx->delivery_start);
2028 # ifndef DISABLE_EVENT
2029 (void) event_raise(sx->conn_args.tblock->event_action,
2030 US"dane:fail", sx->dane_required
2031 ? US"dane-required" : US"dnssec-invalid");
2032 # endif
2033 return rc;
2034 }
2035 }
2036 else if (sx->dane_required)
2037 {
2038 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2039 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
2040 FAIL, FALSE, &sx->delivery_start);
2041 # ifndef DISABLE_EVENT
2042 (void) event_raise(sx->conn_args.tblock->event_action,
2043 US"dane:fail", US"dane-required");
2044 # endif
2045 return FAIL;
2046 }
2047 }
2048 #endif /*DANE*/
2049
2050 /* Make the TCP connection */
2051
2052 sx->cctx.tls_ctx = NULL;
2053 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2054 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2055
2056 #ifndef DISABLE_PIPE_CONNECT
2057 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2058 sx->conn_args.host) == OK)
2059
2060 /* We don't find out the local ip address until the connect, so if
2061 the helo string might use it avoid doing early-pipelining. */
2062
2063 if ( !sx->helo_data
2064 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2065 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2066 )
2067 {
2068 sx->early_pipe_ok = TRUE;
2069 if ( read_ehlo_cache_entry(sx)
2070 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2071 {
2072 DEBUG(D_transport)
2073 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2074 sx->early_pipe_active = TRUE;
2075 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2076 }
2077 }
2078 else DEBUG(D_transport)
2079 debug_printf("helo needs $sending_ip_address\n");
2080
2081 PIPE_CONNECT_RETRY:
2082 if (sx->early_pipe_active)
2083 sx->outblock.conn_args = &sx->conn_args;
2084 else
2085 #endif
2086 {
2087 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2088 {
2089 set_errno_nohost(sx->addrlist,
2090 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2091 sx->verify ? US strerror(errno) : NULL,
2092 DEFER, FALSE, &sx->delivery_start);
2093 sx->send_quit = FALSE;
2094 return DEFER;
2095 }
2096 }
2097 /* Expand the greeting message while waiting for the initial response. (Makes
2098 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2099 delayed till here so that $sending_interface and $sending_port are set. */
2100 /*XXX early-pipe: they still will not be. Is there any way to find out what they
2101 will be? Somehow I doubt it. */
2102
2103 if (sx->helo_data)
2104 if (!(sx->helo_data = expand_string(sx->helo_data)))
2105 if (sx->verify)
2106 log_write(0, LOG_MAIN|LOG_PANIC,
2107 "<%s>: failed to expand transport's helo_data value for callout: %s",
2108 sx->addrlist->address, expand_string_message);
2109
2110 #ifdef SUPPORT_I18N
2111 if (sx->helo_data)
2112 {
2113 expand_string_message = NULL;
2114 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2115 &expand_string_message)),
2116 expand_string_message)
2117 if (sx->verify)
2118 log_write(0, LOG_MAIN|LOG_PANIC,
2119 "<%s>: failed to expand transport's helo_data value for callout: %s",
2120 sx->addrlist->address, expand_string_message);
2121 else
2122 sx->helo_data = NULL;
2123 }
2124 #endif
2125
2126 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2127 is nevertheless a reasonably clean way of programming this kind of logic,
2128 where you want to escape on any error. */
2129
2130 if (!sx->smtps)
2131 {
2132 #ifndef DISABLE_PIPE_CONNECT
2133 if (sx->early_pipe_active)
2134 {
2135 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2136 sx->outblock.cmd_count = 1;
2137 }
2138 else
2139 #endif
2140 {
2141 #ifdef TCP_QUICKACK
2142 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2143 sizeof(off));
2144 #endif
2145 if (!smtp_reap_banner(sx))
2146 goto RESPONSE_FAILED;
2147 }
2148
2149 #ifndef DISABLE_EVENT
2150 {
2151 uschar * s;
2152 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2153 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2154 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
2155 if (s)
2156 {
2157 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
2158 string_sprintf("deferred by smtp:connect event expansion: %s", s),
2159 DEFER, FALSE, &sx->delivery_start);
2160 yield = DEFER;
2161 goto SEND_QUIT;
2162 }
2163 }
2164 #endif
2165
2166 /* Now check if the helo_data expansion went well, and sign off cleanly if
2167 it didn't. */
2168
2169 if (!sx->helo_data)
2170 {
2171 message = string_sprintf("failed to expand helo_data: %s",
2172 expand_string_message);
2173 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2174 yield = DEFER;
2175 goto SEND_QUIT;
2176 }
2177 }
2178
2179 /** Debugging without sending a message
2180 sx->addrlist->transport_return = DEFER;
2181 goto SEND_QUIT;
2182 **/
2183
2184 /* Errors that occur after this point follow an SMTP command, which is
2185 left in big_buffer by smtp_write_command() for use in error messages. */
2186
2187 smtp_command = big_buffer;
2188
2189 /* Tell the remote who we are...
2190
2191 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2192 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2193 greeting is of this form. The assumption was that the far end supports it
2194 properly... but experience shows that there are some that give 5xx responses,
2195 even though the banner includes "ESMTP" (there's a bloody-minded one that
2196 says "ESMTP not spoken here"). Cope with that case.
2197
2198 September 2000: Time has passed, and it seems reasonable now to always send
2199 EHLO at the start. It is also convenient to make the change while installing
2200 the TLS stuff.
2201
2202 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2203 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2204 would be no way to send out the mails, so there is now a host list
2205 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2206 PIPELINING problem as well. Maybe it can also be useful to cure other
2207 problems with broken servers.
2208
2209 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2210 Then somebody tried it with a Microsoft mailer... It seems that all other
2211 mailers use upper case for some reason (the RFC is quite clear about case
2212 independence) so, for peace of mind, I gave in. */
2213
2214 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
2215
2216 /* Alas; be careful, since this goto is not an error-out, so conceivably
2217 we might set data between here and the target which we assume to exist
2218 and be usable. I can see this coming back to bite us. */
2219 #ifndef DISABLE_TLS
2220 if (sx->smtps)
2221 {
2222 smtp_peer_options |= OPTION_TLS;
2223 suppress_tls = FALSE;
2224 ob->tls_tempfail_tryclear = FALSE;
2225 smtp_command = US"SSL-on-connect";
2226 goto TLS_NEGOTIATE;
2227 }
2228 #endif
2229
2230 if (sx->esmtp)
2231 {
2232 if (smtp_write_command(sx,
2233 #ifndef DISABLE_PIPE_CONNECT
2234 sx->early_pipe_active ? SCMD_BUFFER :
2235 #endif
2236 SCMD_FLUSH,
2237 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
2238 goto SEND_FAILED;
2239 sx->esmtp_sent = TRUE;
2240
2241 #ifndef DISABLE_PIPE_CONNECT
2242 if (sx->early_pipe_active)
2243 {
2244 sx->pending_EHLO = TRUE;
2245
2246 /* If we have too many authenticators to handle and might need to AUTH
2247 for this transport, pipeline no further as we will need the
2248 list of auth methods offered. Reap the banner and EHLO. */
2249
2250 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2251 && f.smtp_in_early_pipe_no_auth)
2252 {
2253 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2254 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2255 goto SEND_FAILED;
2256 if (sync_responses(sx, 2, 0) != 0)
2257 {
2258 HDEBUG(D_transport)
2259 debug_printf("failed reaping pipelined cmd responses\n");
2260 goto RESPONSE_FAILED;
2261 }
2262 sx->early_pipe_active = FALSE;
2263 }
2264 }
2265 else
2266 #endif
2267 if (!smtp_reap_ehlo(sx))
2268 goto RESPONSE_FAILED;
2269 }
2270 else
2271 DEBUG(D_transport)
2272 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2273
2274 #ifndef DISABLE_PIPE_CONNECT
2275 if (!sx->early_pipe_active)
2276 #endif
2277 if (!sx->esmtp)
2278 {
2279 BOOL good_response;
2280 int n = sizeof(sx->buffer);
2281 uschar * rsp = sx->buffer;
2282
2283 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2284 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
2285
2286 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2287 goto SEND_FAILED;
2288 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
2289 #ifdef EXPERIMENTAL_DSN_INFO
2290 sx->helo_response = string_copy(rsp);
2291 #endif
2292 if (!good_response)
2293 {
2294 /* Handle special logging for a closed connection after HELO
2295 when had previously sent EHLO */
2296
2297 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2298 {
2299 errno = ERRNO_SMTPCLOSED;
2300 goto EHLOHELO_FAILED;
2301 }
2302 memmove(sx->buffer, rsp, Ustrlen(rsp));
2303 goto RESPONSE_FAILED;
2304 }
2305 }
2306
2307 if (sx->esmtp || sx->lmtp)
2308 {
2309 #ifndef DISABLE_PIPE_CONNECT
2310 if (!sx->early_pipe_active)
2311 #endif
2312 {
2313 sx->peer_offered = ehlo_response(sx->buffer,
2314 OPTION_TLS /* others checked later */
2315 #ifndef DISABLE_PIPE_CONNECT
2316 | (sx->early_pipe_ok
2317 ? OPTION_IGNQ
2318 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2319 #ifdef SUPPORT_I18N
2320 | OPTION_UTF8
2321 #endif
2322 | OPTION_EARLY_PIPE
2323 : 0
2324 )
2325 #endif
2326 );
2327 #ifndef DISABLE_PIPE_CONNECT
2328 if (sx->early_pipe_ok)
2329 {
2330 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2331
2332 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2333 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2334 {
2335 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2336 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2337 write_ehlo_cache_entry(sx);
2338 }
2339 }
2340 #endif
2341 }
2342
2343 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2344
2345 #ifndef DISABLE_TLS
2346 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
2347 #endif
2348 }
2349 }
2350
2351 /* For continuing deliveries down the same channel, having re-exec'd the socket
2352 is the standard input; for a socket held open from verify it is recorded
2353 in the cutthrough context block. Either way we don't need to redo EHLO here
2354 (but may need to do so for TLS - see below).
2355 Set up the pointer to where subsequent commands will be left, for
2356 error messages. Note that smtp_peer_options will have been
2357 set from the command line if they were set in the process that passed the
2358 connection on. */
2359
2360 /*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
2361 as the continue goes via transport_pass_socket() and doublefork and exec.
2362 It does not wait. Unclear how we keep separate host's responses
2363 separate - we could match up by host ip+port as a bodge. */
2364
2365 else
2366 {
2367 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
2368 {
2369 sx->cctx = cutthrough.cctx;
2370 sx->conn_args.host->port = sx->port = cutthrough.host.port;
2371 }
2372 else
2373 {
2374 sx->cctx.sock = 0; /* stdin */
2375 sx->cctx.tls_ctx = NULL;
2376 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
2377 }
2378 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
2379 smtp_command = big_buffer;
2380 sx->peer_offered = smtp_peer_options;
2381 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
2382
2383 /* For a continued connection with TLS being proxied for us, or a
2384 held-open verify connection with TLS, nothing more to do. */
2385
2386 if ( continue_proxy_cipher
2387 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2388 && cutthrough.is_tls)
2389 )
2390 {
2391 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2392 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2393 continue_proxy_cipher ? "proxied" : "verify conn with");
2394 return OK;
2395 }
2396 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
2397 }
2398
2399 /* If TLS is available on this connection, whether continued or not, attempt to
2400 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2401 send another EHLO - the server may give a different answer in secure mode. We
2402 use a separate buffer for reading the response to STARTTLS so that if it is
2403 negative, the original EHLO data is available for subsequent analysis, should
2404 the client not be required to use TLS. If the response is bad, copy the buffer
2405 for error analysis. */
2406
2407 #ifndef DISABLE_TLS
2408 if ( smtp_peer_options & OPTION_TLS
2409 && !suppress_tls
2410 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
2411 && ( !sx->verify
2412 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
2413 ) )
2414 {
2415 uschar buffer2[4096];
2416
2417 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
2418 goto SEND_FAILED;
2419
2420 #ifndef DISABLE_PIPE_CONNECT
2421 /* If doing early-pipelining reap the banner and EHLO-response but leave
2422 the response for the STARTTLS we just sent alone. */
2423
2424 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2425 {
2426 HDEBUG(D_transport)
2427 debug_printf("failed reaping pipelined cmd responses\n");
2428 close(sx->cctx.sock);
2429 sx->cctx.sock = -1;
2430 sx->early_pipe_active = FALSE;
2431 goto PIPE_CONNECT_RETRY;
2432 }
2433 #endif
2434
2435 /* If there is an I/O error, transmission of this message is deferred. If
2436 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2437 false, we also defer. However, if there is a temporary rejection of STARTTLS
2438 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2439 STARTTLS, we carry on. This means we will try to send the message in clear,
2440 unless the host is in hosts_require_tls (tested below). */
2441
2442 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
2443 {
2444 if ( errno != 0
2445 || buffer2[0] == 0
2446 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
2447 )
2448 {
2449 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
2450 sx->buffer[sizeof(sx->buffer)-1] = '\0';
2451 goto RESPONSE_FAILED;
2452 }
2453 }
2454
2455 /* STARTTLS accepted: try to negotiate a TLS session. */
2456
2457 else
2458 TLS_NEGOTIATE:
2459 {
2460 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
2461 {
2462 /* TLS negotiation failed; give an error. From outside, this function may
2463 be called again to try in clear on a new connection, if the options permit
2464 it for this host. */
2465 #ifdef USE_GNUTLS
2466 GNUTLS_CONN_FAILED:
2467 #endif
2468 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
2469
2470 # ifdef SUPPORT_DANE
2471 if (sx->conn_args.dane)
2472 {
2473 log_write(0, LOG_MAIN,
2474 "DANE attempt failed; TLS connection to %s [%s]: %s",
2475 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
2476 # ifndef DISABLE_EVENT
2477 (void) event_raise(sx->conn_args.tblock->event_action,
2478 US"dane:fail", US"validation-failure"); /* could do with better detail */
2479 # endif
2480 }
2481 # endif
2482
2483 errno = ERRNO_TLSFAILURE;
2484 message = string_sprintf("TLS session: %s", tls_errstr);
2485 sx->send_quit = FALSE;
2486 goto TLS_FAILED;
2487 }
2488
2489 /* TLS session is set up */
2490
2491 smtp_peer_options_wrap = smtp_peer_options;
2492 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
2493 if (addr->transport_return == PENDING_DEFER)
2494 {
2495 addr->cipher = tls_out.cipher;
2496 addr->ourcert = tls_out.ourcert;
2497 addr->peercert = tls_out.peercert;
2498 addr->peerdn = tls_out.peerdn;
2499 addr->ocsp = tls_out.ocsp;
2500 addr->tlsver = tls_out.ver;
2501 }
2502 }
2503 }
2504
2505 /* if smtps, we'll have smtp_command set to something else; always safe to
2506 reset it here. */
2507 smtp_command = big_buffer;
2508
2509 /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2510 helo_data is null, we are dealing with a connection that was passed from
2511 another process, and so we won't have expanded helo_data above. We have to
2512 expand it here. $sending_ip_address and $sending_port are set up right at the
2513 start of the Exim process (in exim.c). */
2514
2515 if (tls_out.active.sock >= 0)
2516 {
2517 uschar * greeting_cmd;
2518
2519 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
2520 {
2521 uschar *message = string_sprintf("failed to expand helo_data: %s",
2522 expand_string_message);
2523 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2524 yield = DEFER;
2525 goto SEND_QUIT;
2526 }
2527
2528 #ifndef DISABLE_PIPE_CONNECT
2529 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2530 We're unlikely to get the group sent and delivered before the server sends its
2531 banner, but it's still worth sending as a group.
2532 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2533 the reverse. */
2534
2535 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2536 {
2537 sx->peer_offered = sx->ehlo_resp.crypted_features;
2538 if ((sx->early_pipe_active =
2539 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2540 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2541 }
2542 #endif
2543
2544 /* For SMTPS we need to wait for the initial OK response. */
2545 if (sx->smtps)
2546 #ifndef DISABLE_PIPE_CONNECT
2547 if (sx->early_pipe_active)
2548 {
2549 sx->pending_BANNER = TRUE;
2550 sx->outblock.cmd_count = 1;
2551 }
2552 else
2553 #endif
2554 if (!smtp_reap_banner(sx))
2555 goto RESPONSE_FAILED;
2556
2557 if (sx->lmtp)
2558 greeting_cmd = US"LHLO";
2559 else if (sx->esmtp)
2560 greeting_cmd = US"EHLO";
2561 else
2562 {
2563 greeting_cmd = US"HELO";
2564 DEBUG(D_transport)
2565 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
2566 }
2567
2568 if (smtp_write_command(sx,
2569 #ifndef DISABLE_PIPE_CONNECT
2570 sx->early_pipe_active ? SCMD_BUFFER :
2571 #endif
2572 SCMD_FLUSH,
2573 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
2574 goto SEND_FAILED;
2575
2576 #ifndef DISABLE_PIPE_CONNECT
2577 if (sx->early_pipe_active)
2578 sx->pending_EHLO = TRUE;
2579 else
2580 #endif
2581 {
2582 if (!smtp_reap_ehlo(sx))
2583 #ifdef USE_GNUTLS
2584 {
2585 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2586 cert late, under TLS1.3 - which means here; the first time we try to
2587 receive crypted data. Treat it as if it was a connect-time failure.
2588 See also the early-pipe equivalent... which will be hard; every call
2589 to sync_responses will need to check the result.
2590 It would be nicer to have GnuTLS check the cert during the handshake.
2591 Can it do that, with all the flexibility we need? */
2592
2593 tls_errstr = US"error on first read";
2594 goto GNUTLS_CONN_FAILED;
2595 }
2596 #else
2597 goto RESPONSE_FAILED;
2598 #endif
2599 smtp_peer_options = 0;
2600 }
2601 }
2602
2603 /* If the host is required to use a secure channel, ensure that we
2604 have one. */
2605
2606 else if ( sx->smtps
2607 # ifdef SUPPORT_DANE
2608 || sx->conn_args.dane
2609 # endif
2610 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
2611 )
2612 {
2613 errno = ERRNO_TLSREQUIRED;
2614 message = string_sprintf("a TLS session is required, but %s",
2615 smtp_peer_options & OPTION_TLS
2616 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
2617 # if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
2618 if (sx->conn_args.dane)
2619 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
2620 smtp_peer_options & OPTION_TLS
2621 ? US"validation-failure" /* could do with better detail */
2622 : US"starttls-not-supported");
2623 # endif
2624 goto TLS_FAILED;
2625 }
2626 #endif /*DISABLE_TLS*/
2627
2628 /* If TLS is active, we have just started it up and re-done the EHLO command,
2629 so its response needs to be analyzed. If TLS is not active and this is a
2630 continued session down a previously-used socket, we haven't just done EHLO, so
2631 we skip this. */
2632
2633 if (continue_hostname == NULL
2634 #ifndef DISABLE_TLS
2635 || tls_out.active.sock >= 0
2636 #endif
2637 )
2638 {
2639 if (sx->esmtp || sx->lmtp)
2640 {
2641 #ifndef DISABLE_PIPE_CONNECT
2642 if (!sx->early_pipe_active)
2643 #endif
2644 {
2645 sx->peer_offered = ehlo_response(sx->buffer,
2646 0 /* no TLS */
2647 #ifndef DISABLE_PIPE_CONNECT
2648 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2649 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2650 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
2651 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2652
2653 #else
2654
2655 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2656 | OPTION_CHUNKING
2657 | OPTION_PRDR
2658 # ifdef SUPPORT_I18N
2659 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
2660 /*XXX if we hand peercaps on to continued-conn processes,
2661 must not depend on this addr */
2662 # endif
2663 | OPTION_DSN
2664 | OPTION_PIPE
2665 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
2666 #endif
2667 );
2668 #ifndef DISABLE_PIPE_CONNECT
2669 if (tls_out.active.sock >= 0)
2670 sx->ehlo_resp.crypted_features = sx->peer_offered;
2671 #endif
2672 }
2673
2674 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2675 lmtp_ignore_quota option was set. */
2676
2677 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
2678
2679 /* If the response to EHLO specified support for the SIZE parameter, note
2680 this, provided size_addition is non-negative. */
2681
2682 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
2683
2684 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2685 the current host, esmtp will be false, so PIPELINING can never be used. If
2686 the current host matches hosts_avoid_pipelining, don't do it. */
2687
2688 if ( sx->peer_offered & OPTION_PIPE
2689 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
2690 smtp_peer_options |= OPTION_PIPE;
2691
2692 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2693 smtp_peer_options & OPTION_PIPE ? "" : "not ");
2694
2695 if ( sx->peer_offered & OPTION_CHUNKING
2696 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
2697 sx->peer_offered &= ~OPTION_CHUNKING;
2698
2699 if (sx->peer_offered & OPTION_CHUNKING)
2700 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
2701
2702 #ifndef DISABLE_PRDR
2703 if ( sx->peer_offered & OPTION_PRDR
2704 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
2705 sx->peer_offered &= ~OPTION_PRDR;
2706
2707 if (sx->peer_offered & OPTION_PRDR)
2708 DEBUG(D_transport) debug_printf("PRDR usable\n");
2709 #endif
2710
2711 /* Note if the server supports DSN */
2712 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2713 DEBUG(D_transport) debug_printf("%susing DSN\n",
2714 sx->peer_offered & OPTION_DSN ? "" : "not ");
2715
2716 #ifndef DISABLE_PIPE_CONNECT
2717 if ( sx->early_pipe_ok
2718 && !sx->early_pipe_active
2719 && tls_out.active.sock >= 0
2720 && smtp_peer_options & OPTION_PIPE
2721 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2722 & OPTION_EARLY_PIPE)
2723 {
2724 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2725 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2726 write_ehlo_cache_entry(sx);
2727 }
2728 #endif
2729
2730 /* Note if the response to EHLO specifies support for the AUTH extension.
2731 If it has, check that this host is one we want to authenticate to, and do
2732 the business. The host name and address must be available when the
2733 authenticator's client driver is running. */
2734
2735 switch (yield = smtp_auth(sx))
2736 {
2737 default: goto SEND_QUIT;
2738 case OK: break;
2739 case FAIL_SEND: goto SEND_FAILED;
2740 case FAIL: goto RESPONSE_FAILED;
2741 }
2742 }
2743 }
2744 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
2745
2746 /* The setting up of the SMTP call is now complete. Any subsequent errors are
2747 message-specific. */
2748
2749 sx->setting_up = FALSE;
2750
2751 #ifdef SUPPORT_I18N
2752 if (sx->addrlist->prop.utf8_msg)
2753 {
2754 uschar * s;
2755
2756 /* If the transport sets a downconversion mode it overrides any set by ACL
2757 for the message. */
2758
2759 if ((s = ob->utf8_downconvert))
2760 {
2761 if (!(s = expand_string(s)))
2762 {
2763 message = string_sprintf("failed to expand utf8_downconvert: %s",
2764 expand_string_message);
2765 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
2766 yield = DEFER;
2767 goto SEND_QUIT;
2768 }
2769 switch (*s)
2770 {
2771 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2772 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2773 break;
2774 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2775 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2776 break;
2777 case '-': if (s[1] == '1')
2778 {
2779 sx->addrlist->prop.utf8_downcvt = FALSE;
2780 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2781 }
2782 break;
2783 }
2784 }
2785
2786 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2787 && !sx->addrlist->prop.utf8_downcvt_maybe;
2788 DEBUG(D_transport) if (!sx->utf8_needed)
2789 debug_printf("utf8: %s downconvert\n",
2790 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2791 }
2792
2793 /* If this is an international message we need the host to speak SMTPUTF8 */
2794 if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
2795 {
2796 errno = ERRNO_UTF8_FWD;
2797 goto RESPONSE_FAILED;
2798 }
2799 #endif /*SUPPORT_I18N*/
2800
2801 return OK;
2802
2803
2804 {
2805 int code;
2806
2807 RESPONSE_FAILED:
2808 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2809 {
2810 /* There is a testing facility for simulating a connection timeout, as I
2811 can't think of any other way of doing this. It converts a connection
2812 refused into a timeout if the timeout is set to 999999. This is done for
2813 a 3whs connection in ip_connect(), but a TFO connection does not error
2814 there - instead it gets ECONNREFUSED on the first data read. Tracking
2815 that a TFO really was done is too hard, or we would set a
2816 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2817 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2818 cmd-timeout. */
2819
2820 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2821 errno = ETIMEDOUT;
2822 set_errno_nohost(sx->addrlist,
2823 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2824 sx->verify ? US strerror(errno) : NULL,
2825 DEFER, FALSE, &sx->delivery_start);
2826 sx->send_quit = FALSE;
2827 return DEFER;
2828 }
2829
2830 /* really an error on an SMTP read */
2831 message = NULL;
2832 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
2833 sx->buffer, &code, &message, &pass_message);
2834 yield = DEFER;
2835 goto FAILED;
2836
2837 SEND_FAILED:
2838 code = '4';
2839 message = US string_sprintf("send() to %s [%s] failed: %s",
2840 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
2841 sx->send_quit = FALSE;
2842 yield = DEFER;
2843 goto FAILED;
2844
2845 EHLOHELO_FAILED:
2846 code = '4';
2847 message = string_sprintf("Remote host closed connection in response to %s"
2848 " (EHLO response was: %s)", smtp_command, sx->buffer);
2849 sx->send_quit = FALSE;
2850 yield = DEFER;
2851 goto FAILED;
2852
2853 /* This label is jumped to directly when a TLS negotiation has failed,
2854 or was not done for a host for which it is required. Values will be set
2855 in message and errno, and setting_up will always be true. Treat as
2856 a temporary error. */
2857
2858 #ifndef DISABLE_TLS
2859 TLS_FAILED:
2860 code = '4', yield = DEFER;
2861 goto FAILED;
2862 #endif
2863
2864 /* The failure happened while setting up the call; see if the failure was
2865 a 5xx response (this will either be on connection, or following HELO - a 5xx
2866 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2867 fail all addresses, as this host is never going to accept them. For other
2868 errors during setting up (timeouts or whatever), defer all addresses, and
2869 yield DEFER, so that the host is not tried again for a while.
2870
2871 XXX This peeking for another host feels like a layering violation. We want
2872 to note the host as unusable, but down here we shouldn't know if this was
2873 the last host to try for the addr(list). Perhaps the upper layer should be
2874 the one to do set_errno() ? The problem is that currently the addr is where
2875 errno etc. are stashed, but until we run out of hosts to try the errors are
2876 host-specific. Maybe we should enhance the host_item definition? */
2877
2878 FAILED:
2879 sx->ok = FALSE; /* For when reached by GOTO */
2880 set_errno(sx->addrlist, errno, message,
2881 sx->conn_args.host->next
2882 ? DEFER
2883 : code == '5'
2884 #ifdef SUPPORT_I18N
2885 || errno == ERRNO_UTF8_FWD
2886 #endif
2887 ? FAIL : DEFER,
2888 pass_message,
2889 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
2890 #ifdef EXPERIMENTAL_DSN_INFO
2891 sx->smtp_greeting, sx->helo_response,
2892 #endif
2893 &sx->delivery_start);
2894 }
2895
2896
2897 SEND_QUIT:
2898
2899 if (sx->send_quit)
2900 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
2901
2902 #ifndef DISABLE_TLS
2903 if (sx->cctx.tls_ctx)
2904 {
2905 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2906 sx->cctx.tls_ctx = NULL;
2907 }
2908 #endif
2909
2910 /* Close the socket, and return the appropriate value, first setting
2911 works because the NULL setting is passed back to the calling process, and
2912 remote_max_parallel is forced to 1 when delivering over an existing connection,
2913 */
2914
2915 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
2916 if (sx->send_quit)
2917 {
2918 shutdown(sx->cctx.sock, SHUT_WR);
2919 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
2920 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2921 i--; /* drain socket */
2922 sx->send_quit = FALSE;
2923 }
2924 (void)close(sx->cctx.sock);
2925 sx->cctx.sock = -1;
2926
2927 #ifndef DISABLE_EVENT
2928 (void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
2929 #endif
2930
2931 continue_transport = NULL;
2932 continue_hostname = NULL;
2933 return yield;
2934 }
2935
2936
2937
2938
2939 /* Create the string of options that will be appended to the MAIL FROM:
2940 in the connection context buffer */
2941
2942 static int
2943 build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2944 {
2945 uschar * p = sx->buffer;
2946 address_item * addr;
2947 int address_count;
2948
2949 *p = 0;
2950
2951 /* If we know the receiving MTA supports the SIZE qualification, and we know it,
2952 send it, adding something to the message size to allow for imprecision
2953 and things that get added en route. Exim keeps the number of lines
2954 in a message, so we can give an accurate value for the original message, but we
2955 need some additional to handle added headers. (Double "." characters don't get
2956 included in the count.) */
2957
2958 if ( message_size > 0
2959 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
2960 {
2961 /*XXX problem here under spool_files_wireformat?
2962 Or just forget about lines? Or inflate by a fixed proportion? */
2963
2964 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
2965 while (*p) p++;
2966 }
2967
2968 #ifndef DISABLE_PRDR
2969 /* If it supports Per-Recipient Data Responses, and we have more than one recipient,
2970 request that */
2971
2972 sx->prdr_active = FALSE;
2973 if (sx->peer_offered & OPTION_PRDR)
2974 for (address_item * addr = addrlist; addr; addr = addr->next)
2975 if (addr->transport_return == PENDING_DEFER)
2976 {
2977 for (addr = addr->next; addr; addr = addr->next)
2978 if (addr->transport_return == PENDING_DEFER)
2979 { /* at least two recipients to send */
2980 sx->prdr_active = TRUE;
2981 sprintf(CS p, " PRDR"); p += 5;
2982 break;
2983 }
2984 break;
2985 }
2986 #endif
2987
2988 #ifdef SUPPORT_I18N
2989 /* If it supports internationalised messages, and this meesage need that,
2990 request it */
2991
2992 if ( sx->peer_offered & OPTION_UTF8
2993 && addrlist->prop.utf8_msg
2994 && !addrlist->prop.utf8_downcvt
2995 )
2996 Ustrcpy(p, US" SMTPUTF8"), p += 9;
2997 #endif
2998
2999 /* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3000 for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3001 addr && address_count < sx->max_rcpt;
3002 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3003 {
3004 address_count++;
3005 if (!(addr->dsn_flags & rf_dsnlasthop))
3006 {
3007 sx->dsn_all_lasthop = FALSE;
3008 break;
3009 }
3010 }
3011
3012 /* Add any DSN flags to the mail command */
3013
3014 if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
3015 {
3016 if (dsn_ret == dsn_ret_hdrs)
3017 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
3018 else if (dsn_ret == dsn_ret_full)
3019 { Ustrcpy(p, US" RET=FULL"); p += 9; }
3020
3021 if (dsn_envid)
3022 {
3023 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3024 while (*p) p++;
3025 }
3026 }
3027
3028 /* If an authenticated_sender override has been specified for this transport
3029 instance, expand it. If the expansion is forced to fail, and there was already
3030 an authenticated_sender for this message, the original value will be used.
3031 Other expansion failures are serious. An empty result is ignored, but there is
3032 otherwise no check - this feature is expected to be used with LMTP and other
3033 cases where non-standard addresses (e.g. without domains) might be required. */
3034
3035 return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
3036 }
3037
3038
3039 static void
3040 build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3041 {
3042 uschar * p = sx->buffer;
3043 *p = 0;
3044
3045 /* Add any DSN flags to the rcpt command */
3046
3047 if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
3048 {
3049 if (addr->dsn_flags & rf_dsnflags)
3050 {
3051 BOOL first = TRUE;
3052
3053 Ustrcpy(p, US" NOTIFY=");
3054 while (*p) p++;
3055 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
3056 {
3057 if (!first) *p++ = ',';
3058 first = FALSE;
3059 Ustrcpy(p, rf_names[i]);
3060 while (*p) p++;
3061 }
3062 }
3063
3064 if (addr->dsn_orcpt)
3065 {
3066 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3067 addr->dsn_orcpt);
3068 while (*p) p++;
3069 }
3070 }
3071 }
3072
3073
3074
3075 /*
3076 Return:
3077 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3078 -1 MAIL response error
3079 -2 any non-MAIL read i/o error
3080 -3 non-MAIL response timeout
3081 -4 internal error; channel still usable
3082 -5 transmit failed
3083 */
3084
3085 int
3086 smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3087 {
3088 address_item * addr;
3089 int address_count, pipe_limit;
3090 int rc;
3091
3092 if (build_mailcmd_options(sx, sx->first_addr) != OK)
3093 {
3094 *yield = ERROR;
3095 return -4;
3096 }
3097
3098 /* From here until we send the DATA command, we can make use of PIPELINING
3099 if the server host supports it. The code has to be able to check the responses
3100 at any point, for when the buffer fills up, so we write it totally generally.
3101 When PIPELINING is off, each command written reports that it has flushed the
3102 buffer. */
3103
3104 sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3105
3106 {
3107 uschar * s = sx->from_addr;
3108 #ifdef SUPPORT_I18N
3109 uschar * errstr = NULL;
3110
3111 /* If we must downconvert, do the from-address here. Remember we had to
3112 for the to-addresses (done below), and also (ugly) for re-doing when building
3113 the delivery log line. */
3114
3115 if ( sx->addrlist->prop.utf8_msg
3116 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
3117 )
3118 {
3119 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3120 {
3121 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
3122 *yield = ERROR;
3123 return -4;
3124 }
3125 setflag(sx->addrlist, af_utf8_downcvt);
3126 }
3127 #endif
3128
3129 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
3130 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3131 }
3132
3133 mail_command = string_copy(big_buffer); /* Save for later error message */
3134
3135 switch(rc)
3136 {
3137 case -1: /* Transmission error */
3138 return -5;
3139
3140 case +1: /* Cmd was sent */
3141 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3142 (SOB sx->conn_args.ob)->command_timeout))
3143 {
3144 if (errno == 0 && sx->buffer[0] == '4')
3145 {
3146 errno = ERRNO_MAIL4XX;
3147 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3148 }
3149 return -1;
3150 }
3151 sx->pending_MAIL = FALSE;
3152 break;
3153
3154 /* otherwise zero: command queued for pipeline */
3155 }
3156
3157 /* Pass over all the relevant recipient addresses for this host, which are the
3158 ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3159 several before we have to read the responses for those seen so far. This
3160 checking is done by a subroutine because it also needs to be done at the end.
3161 Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3162 the next one if not all are sent.
3163
3164 In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3165 last address because we want to abort if any recipients have any kind of
3166 problem, temporary or permanent. We know that all recipient addresses will have
3167 the PENDING_DEFER status, because only one attempt is ever made, and we know
3168 that max_rcpt will be large, so all addresses will be done at once.
3169
3170 For verify we flush the pipeline after any (the only) rcpt address. */
3171
3172 for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
3173 addr && address_count < sx->max_rcpt;
3174 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3175 {
3176 int cmds_sent;
3177 BOOL no_flush;
3178 uschar * rcpt_addr;
3179
3180 addr->dsn_aware = sx->peer_offered & OPTION_DSN
3181 ? dsn_support_yes : dsn_support_no;
3182
3183 address_count++;
3184 if (pipe_limit-- <= 0)
3185 { no_flush = FALSE; pipe_limit = 100; }
3186 else
3187 no_flush = pipelining_active && !sx->verify
3188 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
3189
3190 build_rcptcmd_options(sx, addr);
3191
3192 /* Now send the RCPT command, and process outstanding responses when
3193 necessary. After a timeout on RCPT, we just end the function, leaving the
3194 yield as OK, because this error can often mean that there is a problem with
3195 just one address, so we don't want to delay the host. */
3196
3197 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
3198
3199 #ifdef SUPPORT_I18N
3200 if ( testflag(sx->addrlist, af_utf8_downcvt)
3201 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3202 )
3203 {
3204 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3205 errno = ERRNO_EXPANDFAIL;
3206 return -5; /*XXX too harsh? */
3207 }
3208 #endif
3209
3210 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
3211 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
3212
3213 if (cmds_sent < 0) return -5;
3214 if (cmds_sent > 0)
3215 {
3216 switch(sync_responses(sx, cmds_sent, 0))
3217 {
3218 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3219 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3220 break;
3221
3222 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3223 if (!sx->lmtp) /* can't tell about progress yet */
3224 sx->completed_addr = TRUE;
3225 case 0: /* No 2xx or 5xx, but no probs */
3226 /* If any RCPT got a 452 response then next_addr has been updated
3227 for restarting with a new MAIL on the same connection. Send no more
3228 RCPTs for this MAIL. */
3229
3230 if (sx->RCPT_452)
3231 {
3232 DEBUG(D_transport) debug_printf("seen 452 too-many-rcpts\n");
3233 sx->RCPT_452 = FALSE;
3234 /* sx->next_addr has been reset for fast_retry */
3235 return 0;
3236 }
3237 break;
3238
3239 case -1: return -3; /* Timeout on RCPT */
3240 case -2: return -2; /* non-MAIL read i/o error */
3241 default: return -1; /* any MAIL error */
3242
3243 #ifndef DISABLE_PIPE_CONNECT
3244 case -4: return -1; /* non-2xx for pipelined banner or EHLO */
3245 case -5: return -1; /* TLS first-read error */
3246 #endif
3247 }
3248 }
3249 } /* Loop for next address */
3250
3251 sx->next_addr = addr;
3252 return 0;
3253 }
3254
3255
3256 #ifndef DISABLE_TLS
3257 /*****************************************************
3258 * Proxy TLS connection for another transport process *
3259 ******************************************************/
3260 /*
3261 Close the unused end of the pipe, fork once more, then use the given buffer
3262 as a staging area, and select on both the given fd and the TLS'd client-fd for
3263 data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
3264 Do blocking full-size writes, and reads under a timeout. Once both input
3265 channels are closed, exit the process.
3266
3267 Arguments:
3268 ct_ctx tls context
3269 buf space to use for buffering
3270 bufsiz size of buffer
3271 pfd pipe filedescriptor array; [0] is comms to proxied process
3272 timeout per-read timeout, seconds
3273
3274 Does not return.
3275 */
3276
3277 void
3278 smtp_proxy_tls(void * ct_ctx, uschar * buf, size_t bsize, int * pfd,
3279 int timeout)
3280 {
3281 fd_set rfds, efds;
3282 int max_fd = MAX(pfd[0], tls_out.active.sock) + 1;
3283 int rc, i;
3284
3285 close(pfd[1]);
3286 if ((rc = exim_fork(US"tls-proxy")))
3287 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
3288
3289 set_process_info("proxying TLS connection for continued transport");
3290 FD_ZERO(&rfds);
3291 FD_SET(tls_out.active.sock, &rfds);
3292 FD_SET(pfd[0], &rfds);
3293
3294 for (int fd_bits = 3; fd_bits; )
3295 {
3296 time_t time_left = timeout;
3297 time_t time_start = time(NULL);
3298
3299 /* wait for data */
3300 efds = rfds;
3301 do
3302 {
3303 struct timeval tv = { time_left, 0 };
3304
3305 rc = select(max_fd,
3306 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
3307
3308 if (rc < 0 && errno == EINTR)
3309 if ((time_left -= time(NULL) - time_start) > 0) continue;
3310
3311 if (rc <= 0)
3312 {
3313 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
3314 goto done;
3315 }
3316
3317 if (FD_ISSET(tls_out.active.sock, &efds) || FD_ISSET(pfd[0], &efds))
3318 {
3319 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
3320 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
3321 goto done;
3322 }
3323 }
3324 while (rc < 0 || !(FD_ISSET(tls_out.active.sock, &rfds) || FD_ISSET(pfd[0], &rfds)));
3325
3326 /* handle inbound data */
3327 if (FD_ISSET(tls_out.active.sock, &rfds))
3328 if ((rc = tls_read(ct_ctx, buf, bsize)) <= 0)
3329 {
3330 fd_bits &= ~1;
3331 FD_CLR(tls_out.active.sock, &rfds);
3332 shutdown(pfd[0], SHUT_WR);
3333 timeout = 5;
3334 }
3335 else
3336 {
3337 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3338 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
3339 }
3340 else if (fd_bits & 1)
3341 FD_SET(tls_out.active.sock, &rfds);
3342
3343 /* handle outbound data */
3344 if (FD_ISSET(pfd[0], &rfds))
3345 if ((rc = read(pfd[0], buf, bsize)) <= 0)
3346 {
3347 fd_bits = 0;
3348 tls_close(ct_ctx, TLS_SHUTDOWN_NOWAIT);
3349 ct_ctx = NULL;
3350 }
3351 else
3352 {
3353 for (int nbytes = 0; rc - nbytes > 0; nbytes += i)
3354 if ((i = tls_write(ct_ctx, buf + nbytes, rc - nbytes, FALSE)) < 0)
3355 goto done;
3356 }
3357 else if (fd_bits & 2)
3358 FD_SET(pfd[0], &rfds);
3359 }
3360
3361 done:
3362 testharness_pause_ms(100); /* let logging complete */
3363 exim_exit(EXIT_SUCCESS);
3364 }
3365 #endif
3366
3367
3368 /*************************************************
3369 * Deliver address list to given host *
3370 *************************************************/
3371
3372 /* If continue_hostname is not null, we get here only when continuing to
3373 deliver down an existing channel. The channel was passed as the standard
3374 input. TLS is never active on a passed channel; the previous process either
3375 closes it down before passing the connection on, or inserts a TLS-proxy
3376 process and passes on a cleartext conection.
3377
3378 Otherwise, we have to make a connection to the remote host, and do the
3379 initial protocol exchange.
3380
3381 When running as an MUA wrapper, if the sender or any recipient is rejected,
3382 temporarily or permanently, we force failure for all recipients.
3383
3384 Arguments:
3385 addrlist chain of potential addresses to deliver; only those whose
3386 transport_return field is set to PENDING_DEFER are currently
3387 being processed; others should be skipped - they have either
3388 been delivered to an earlier host or IP address, or been
3389 failed by one of them.
3390 host host to deliver to
3391 host_af AF_INET or AF_INET6
3392 defport default TCP/IP port to use if host does not specify, in host
3393 byte order
3394 interface interface to bind to, or NULL
3395 tblock transport instance block
3396 message_defer set TRUE if yield is OK, but all addresses were deferred
3397 because of a non-recipient, non-host failure, that is, a
3398 4xx response to MAIL FROM, DATA, or ".". This is a defer
3399 that is specific to the message.
3400 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
3401 a second attempt after TLS initialization fails
3402
3403 Returns: OK - the connection was made and the delivery attempted;
3404 the result for each address is in its data block.
3405 DEFER - the connection could not be made, or something failed
3406 while setting up the SMTP session, or there was a
3407 non-message-specific error, such as a timeout.
3408 ERROR - a filter command is specified for this transport,
3409 and there was a problem setting it up; OR helo_data
3410 or add_headers or authenticated_sender is specified
3411 for this transport, and the string failed to expand
3412
3413 For all non-OK returns the first addr of the list carries the
3414 time taken for the attempt.
3415 */
3416
3417 static int
3418 smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
3419 uschar *interface, transport_instance *tblock,
3420 BOOL *message_defer, BOOL suppress_tls)
3421 {
3422 smtp_transport_options_block * ob = SOB tblock->options_block;
3423 int yield = OK;
3424 int save_errno;
3425 int rc;
3426
3427 BOOL pass_message = FALSE;
3428 uschar *message = NULL;
3429 uschar new_message_id[MESSAGE_ID_LENGTH + 1];
3430 smtp_context * sx = store_get(sizeof(*sx), TRUE); /* tainted, for the data buffers */
3431
3432 suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
3433 *message_defer = FALSE;
3434
3435 memset(sx, 0, sizeof(*sx));
3436 sx->addrlist = addrlist;
3437 sx->conn_args.host = host;
3438 sx->conn_args.host_af = host_af,
3439 sx->port = defport;
3440 sx->conn_args.interface = interface;
3441 sx->helo_data = NULL;
3442 sx->conn_args.tblock = tblock;
3443 /* sx->verify = FALSE; */
3444 gettimeofday(&sx->delivery_start, NULL);
3445 sx->sync_addr = sx->first_addr = addrlist;
3446
3447 /* Get the channel set up ready for a message (MAIL FROM being the next
3448 SMTP command to send */
3449
3450 if ((rc = smtp_setup_conn(sx, suppress_tls)) != OK)
3451 {
3452 timesince(&addrlist->delivery_time, &sx->delivery_start);
3453 return rc;
3454 }
3455
3456 /* If there is a filter command specified for this transport, we can now
3457 set it up. This cannot be done until the identity of the host is known. */
3458
3459 if (tblock->filter_command)
3460 {
3461 transport_filter_timeout = tblock->filter_timeout;
3462
3463 /* On failure, copy the error to all addresses, abandon the SMTP call, and
3464 yield ERROR. */
3465
3466 if (!transport_set_up_command(&transport_filter_argv,
3467 tblock->filter_command, TRUE, DEFER, addrlist,
3468 string_sprintf("%.50s transport", tblock->name), NULL))
3469 {
3470 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
3471 FALSE, &sx->delivery_start);
3472 yield = ERROR;
3473 goto SEND_QUIT;
3474 }
3475
3476 if ( transport_filter_argv
3477 && *transport_filter_argv
3478 && **transport_filter_argv
3479 && sx->peer_offered & OPTION_CHUNKING
3480 #ifndef DISABLE_DKIM
3481 /* When dkim signing, chunking is handled even with a transport-filter */
3482 && !(ob->dkim.dkim_private_key && ob->dkim.dkim_domain && ob->dkim.dkim_selector)
3483 && !ob->dkim.force_bodyhash
3484 #endif
3485 )
3486 {
3487 sx->peer_offered &= ~OPTION_CHUNKING;
3488 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
3489 }
3490 }
3491
3492 /* For messages that have more than the maximum number of envelope recipients,
3493 we want to send several transactions down the same SMTP connection. (See
3494 comments in deliver.c as to how this reconciles, heuristically, with
3495 remote_max_parallel.) This optimization was added to Exim after the following
3496 code was already working. The simplest way to put it in without disturbing the
3497 code was to use a goto to jump back to this point when there is another
3498 transaction to handle. */
3499
3500 SEND_MESSAGE:
3501 sx->from_addr = return_path;
3502 sx->sync_addr = sx->first_addr;
3503 sx->ok = FALSE;
3504 sx->send_rset = TRUE;
3505 sx->completed_addr = FALSE;
3506
3507
3508 /* If we are a continued-connection-after-verify the MAIL and RCPT
3509 commands were already sent; do not re-send but do mark the addrs as
3510 having been accepted up to RCPT stage. A traditional cont-conn
3511 always has a sequence number greater than one. */
3512
3513 if (continue_hostname && continue_sequence == 1)
3514 {
3515 /* sx->pending_MAIL = FALSE; */
3516 sx->ok = TRUE;
3517 /* sx->next_addr = NULL; */
3518
3519 for (address_item * addr = addrlist; addr; addr = addr->next)
3520 addr->transport_return = PENDING_OK;
3521 }
3522 else
3523 {
3524 /* Initiate a message transfer. */
3525
3526 switch(smtp_write_mail_and_rcpt_cmds(sx, &yield))
3527 {
3528 case 0: break;
3529 case -1: case -2: goto RESPONSE_FAILED;
3530 case -3: goto END_OFF;
3531 case -4: goto SEND_QUIT;
3532 default: goto SEND_FAILED;
3533 }
3534
3535 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
3536 permanently or temporarily. We should have flushed and synced after the last
3537 RCPT. */
3538
3539 if (mua_wrapper)
3540 {
3541 address_item * a;
3542 unsigned cnt;
3543
3544 for (a = sx->first_addr, cnt = 0; a && cnt < sx->max_rcpt; a = a->next, cnt++)
3545 if (a->transport_return != PENDING_OK)
3546 {
3547 /*XXX could we find a better errno than 0 here? */
3548 set_errno_nohost(addrlist, 0, a->message, FAIL,
3549 testflag(a, af_pass_message), &sx->delivery_start);
3550 sx->ok = FALSE;
3551 break;
3552 }
3553 }
3554 }
3555
3556 /* If ok is TRUE, we know we have got at least one good recipient, and must now
3557 send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
3558 have a good recipient buffered up if we are pipelining. We don't want to waste
3559 time sending DATA needlessly, so we only send it if either ok is TRUE or if we
3560 are pipelining. The responses are all handled by sync_responses().
3561 If using CHUNKING, do not send a BDAT until we know how big a chunk we want
3562 to send is. */
3563
3564 if ( !(sx->peer_offered & OPTION_CHUNKING)
3565 && (sx->ok || (pipelining_active && !mua_wrapper)))
3566 {
3567 int count = smtp_write_command(sx, SCMD_FLUSH, "DATA\r\n");
3568
3569 if (count < 0) goto SEND_FAILED;
3570 switch(sync_responses(sx, count, sx->ok ? +1 : -1))
3571 {
3572 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3573 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3574 break;
3575
3576 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3577 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3578 case 0: break; /* No 2xx or 5xx, but no probs */
3579
3580 case -1: goto END_OFF; /* Timeout on RCPT */
3581
3582 #ifndef DISABLE_PIPE_CONNECT
3583 case -5: /* TLS first-read error */
3584 case -4: HDEBUG(D_transport)
3585 debug_printf("failed reaping pipelined cmd responses\n");
3586 #endif
3587 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3588 }
3589 pipelining_active = FALSE;
3590 data_command = string_copy(big_buffer); /* Save for later error message */
3591 }
3592
3593 /* If there were no good recipients (but otherwise there have been no
3594 problems), just set ok TRUE, since we have handled address-specific errors
3595 already. Otherwise, it's OK to send the message. Use the check/escape mechanism
3596 for handling the SMTP dot-handling protocol, flagging to apply to headers as
3597 well as body. Set the appropriate timeout value to be used for each chunk.
3598 (Haven't been able to make it work using select() for writing yet.) */
3599
3600 if ( !sx->ok
3601 && (!(sx->peer_offered & OPTION_CHUNKING) || !pipelining_active))
3602 {
3603 /* Save the first address of the next batch. */
3604 sx->first_addr = sx->next_addr;
3605
3606 sx->ok = TRUE;
3607 }
3608 else
3609 {
3610 transport_ctx tctx = {
3611 .u = {.fd = sx->cctx.sock}, /*XXX will this need TLS info? */
3612 .tblock = tblock,
3613 .addr = addrlist,
3614 .check_string = US".",
3615 .escape_string = US"..", /* Escaping strings */
3616 .options =
3617 topt_use_crlf | topt_escape_headers
3618 | (tblock->body_only ? topt_no_headers : 0)
3619 | (tblock->headers_only ? topt_no_body : 0)
3620 | (tblock->return_path_add ? topt_add_return_path : 0)
3621 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
3622 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
3623 };
3624
3625 /* If using CHUNKING we need a callback from the generic transport
3626 support to us, for the sending of BDAT smtp commands and the reaping
3627 of responses. The callback needs a whole bunch of state so set up
3628 a transport-context structure to be passed around. */
3629
3630 if (sx->peer_offered & OPTION_CHUNKING)
3631 {
3632 tctx.check_string = tctx.escape_string = NULL;
3633 tctx.options |= topt_use_bdat;
3634 tctx.chunk_cb = smtp_chunk_cmd_callback;
3635 sx->pending_BDAT = FALSE;
3636 sx->good_RCPT = sx->ok;
3637 sx->cmd_count = 0;
3638 tctx.smtp_context = sx;
3639 }
3640 else
3641 tctx.options |= topt_end_dot;
3642
3643 /* Save the first address of the next batch. */
3644 sx->first_addr = sx->next_addr;
3645
3646 /* Responses from CHUNKING commands go in buffer. Otherwise,
3647 there has not been a response. */
3648
3649 sx->buffer[0] = 0;
3650
3651 sigalrm_seen = FALSE;
3652 transport_write_timeout = ob->data_timeout;
3653 smtp_command = US"sending data block"; /* For error messages */
3654 DEBUG(D_transport|D_v)
3655 if (sx->peer_offered & OPTION_CHUNKING)
3656 debug_printf(" will write message using CHUNKING\n");
3657 else
3658 debug_printf(" SMTP>> writing message and terminating \".\"\n");
3659 transport_count = 0;
3660
3661 #ifndef DISABLE_DKIM
3662 {
3663 # ifdef MEASURE_TIMING
3664 struct timeval t0;
3665 gettimeofday(&t0, NULL);
3666 # endif
3667 dkim_exim_sign_init();
3668 # ifdef EXPERIMENTAL_ARC
3669 {
3670 uschar * s = ob->arc_sign;
3671 if (s)
3672 {
3673 if (!(ob->dkim.arc_signspec = s = expand_string(s)))
3674 {
3675 if (!f.expand_string_forcedfail)
3676 {
3677 message = US"failed to expand arc_sign";
3678 sx->ok = FALSE;
3679 goto SEND_FAILED;
3680 }
3681 }
3682 else if (*s)
3683 {
3684 /* Ask dkim code to hash the body for ARC */
3685 (void) arc_ams_setup_sign_bodyhash();
3686 ob->dkim.force_bodyhash = TRUE;
3687 }
3688 }
3689 }
3690 # endif
3691 # ifdef MEASURE_TIMING
3692 report_time_since(&t0, US"dkim_exim_sign_init (delta)");
3693 # endif
3694 }
3695 sx->ok = dkim_transport_write_message(&tctx, &ob->dkim, CUSS &message);
3696 #else
3697 sx->ok = transport_write_message(&tctx, 0);
3698 #endif
3699
3700 /* transport_write_message() uses write() because it is called from other
3701 places to write to non-sockets. This means that under some OS (e.g. Solaris)
3702 it can exit with "Broken pipe" as its error. This really means that the
3703 socket got closed at the far end. */
3704
3705 transport_write_timeout = 0; /* for subsequent transports */
3706
3707 /* Failure can either be some kind of I/O disaster (including timeout),
3708 or the failure of a transport filter or the expansion of added headers.
3709 Or, when CHUNKING, it can be a protocol-detected failure. */
3710
3711 if (!sx->ok)
3712 if (message) goto SEND_FAILED;
3713 else goto RESPONSE_FAILED;
3714
3715 /* We used to send the terminating "." explicitly here, but because of
3716 buffering effects at both ends of TCP/IP connections, you don't gain
3717 anything by keeping it separate, so it might as well go in the final
3718 data buffer for efficiency. This is now done by setting the topt_end_dot
3719 flag above. */
3720
3721 smtp_command = US"end of data";
3722
3723 if (sx->peer_offered & OPTION_CHUNKING && sx->cmd_count > 1)
3724 {
3725 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
3726 switch(sync_responses(sx, sx->cmd_count-1, 0))
3727 {
3728 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
3729 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
3730 break;
3731
3732 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
3733 if (!sx->lmtp) sx->completed_addr = TRUE; /* can't tell about progress yet */
3734 case 0: break; /* No 2xx or 5xx, but no probs */
3735
3736 case -1: goto END_OFF; /* Timeout on RCPT */
3737
3738 #ifndef DISABLE_PIPE_CONNECT
3739 case -5: /* TLS first-read error */
3740 case -4: HDEBUG(D_transport)
3741 debug_printf("failed reaping pipelined cmd responses\n");
3742 #endif
3743 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3744 }
3745 }
3746
3747 #ifndef DISABLE_PRDR
3748 /* For PRDR we optionally get a partial-responses warning followed by the
3749 individual responses, before going on with the overall response. If we don't
3750 get the warning then deal with per non-PRDR. */
3751
3752 if(sx->prdr_active)
3753 {
3754 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '3', ob->final_timeout);
3755 if (!sx->ok && errno == 0) switch(sx->buffer[0])
3756 {
3757 case '2': sx->prdr_active = FALSE;
3758 sx->ok = TRUE;
3759 break;
3760 case '4': errno = ERRNO_DATA4XX;
3761 addrlist->more_errno |=
3762 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3763 break;
3764 }
3765 }
3766 else
3767 #endif
3768
3769 /* For non-PRDR SMTP, we now read a single response that applies to the
3770 whole message. If it is OK, then all the addresses have been delivered. */
3771
3772 if (!sx->lmtp)
3773 {
3774 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3775 ob->final_timeout);
3776 if (!sx->ok && errno == 0 && sx->buffer[0] == '4')
3777 {
3778 errno = ERRNO_DATA4XX;
3779 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3780 }
3781 }
3782
3783 /* For LMTP, we get back a response for every RCPT command that we sent;
3784 some may be accepted and some rejected. For those that get a response, their
3785 status is fixed; any that are accepted have been handed over, even if later
3786 responses crash - at least, that's how I read RFC 2033.
3787
3788 If all went well, mark the recipient addresses as completed, record which
3789 host/IPaddress they were delivered to, and cut out RSET when sending another
3790 message down the same channel. Write the completed addresses to the journal
3791 now so that they are recorded in case there is a crash of hardware or
3792 software before the spool gets updated. Also record the final SMTP
3793 confirmation if needed (for SMTP only). */
3794
3795 if (sx->ok)
3796 {
3797 int flag = '=';
3798 struct timeval delivery_time;
3799 int len;
3800 uschar * conf = NULL;
3801
3802 timesince(&delivery_time, &sx->delivery_start);
3803 sx->send_rset = FALSE;
3804 pipelining_active = FALSE;
3805
3806 /* Set up confirmation if needed - applies only to SMTP */
3807
3808 if (
3809 #ifdef DISABLE_EVENT
3810 LOGGING(smtp_confirmation) &&
3811 #endif
3812 !sx->lmtp
3813 )
3814 {
3815 const uschar *s = string_printing(sx->buffer);
3816 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3817 conf = (s == sx->buffer)? US string_copy(s) : US s;
3818 }
3819
3820 /* Process all transported addresses - for LMTP or PRDR, read a status for
3821 each one. */
3822
3823 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3824 {
3825 if (addr->transport_return != PENDING_OK) continue;
3826
3827 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3828 remaining addresses. Otherwise, it's a return code for just the one
3829 address. For temporary errors, add a retry item for the address so that
3830 it doesn't get tried again too soon. */
3831
3832 #ifndef DISABLE_PRDR
3833 if (sx->lmtp || sx->prdr_active)
3834 #else
3835 if (sx->lmtp)
3836 #endif
3837 {
3838 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3839 ob->final_timeout))
3840 {
3841 if (errno != 0 || sx->buffer[0] == 0) goto RESPONSE_FAILED;
3842 addr->message = string_sprintf(
3843 #ifndef DISABLE_PRDR
3844 "%s error after %s: %s", sx->prdr_active ? "PRDR":"LMTP",
3845 #else
3846 "LMTP error after %s: %s",
3847 #endif
3848 data_command, string_printing(sx->buffer));
3849 setflag(addr, af_pass_message); /* Allow message to go to user */
3850 if (sx->buffer[0] == '5')
3851 addr->transport_return = FAIL;
3852 else
3853 {
3854 errno = ERRNO_DATA4XX;
3855 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3856 addr->transport_return = DEFER;
3857 #ifndef DISABLE_PRDR
3858 if (!sx->prdr_active)
3859 #endif
3860 retry_add_item(addr, addr->address_retry_key, 0);
3861 }
3862 continue;
3863 }
3864 sx->completed_addr = TRUE; /* NOW we can set this flag */
3865 if (LOGGING(smtp_confirmation))
3866 {
3867 const uschar *s = string_printing(sx->buffer);
3868 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
3869 conf = (s == sx->buffer) ? US string_copy(s) : US s;
3870 }
3871 }
3872
3873 /* SMTP, or success return from LMTP for this address. Pass back the
3874 actual host that was used. */
3875
3876 addr->transport_return = OK;
3877 addr->host_used = host;
3878 addr->delivery_time = delivery_time;
3879 addr->special_action = flag;
3880 addr->message = conf;
3881
3882 if (tcp_out_fastopen)
3883 {
3884 setflag(addr, af_tcp_fastopen_conn);
3885 if (tcp_out_fastopen >= TFO_USED_NODATA) setflag(addr, af_tcp_fastopen);
3886 if (tcp_out_fastopen >= TFO_USED_DATA) setflag(addr, af_tcp_fastopen_data);
3887 }
3888 if (sx->pipelining_used) setflag(addr, af_pipelining);
3889 #ifndef DISABLE_PIPE_CONNECT
3890 if (sx->early_pipe_active) setflag(addr, af_early_pipe);
3891 #endif
3892 #ifndef DISABLE_PRDR
3893 if (sx->prdr_active) setflag(addr, af_prdr_used);
3894 #endif
3895 if (sx->peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
3896 flag = '-';
3897
3898 #ifndef DISABLE_PRDR
3899 if (!sx->prdr_active)
3900 #endif
3901 {
3902 /* Update the journal. For homonymic addresses, use the base address plus
3903 the transport name. See lots of comments in deliver.c about the reasons
3904 for the complications when homonyms are involved. Just carry on after
3905 write error, as it may prove possible to update the spool file later. */
3906
3907 if (testflag(addr, af_homonym))
3908 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3909 else
3910 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
3911
3912 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx->buffer);
3913 len = Ustrlen(CS sx->buffer);
3914 if (write(journal_fd, sx->buffer, len) != len)
3915 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3916 "%s: %s", sx->buffer, strerror(errno));
3917 }
3918 }
3919
3920 #ifndef DISABLE_PRDR
3921 if (sx->prdr_active)
3922 {
3923 const uschar * overall_message;
3924
3925 /* PRDR - get the final, overall response. For any non-success
3926 upgrade all the address statuses. */
3927
3928 sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
3929 ob->final_timeout);
3930 if (!sx->ok)
3931 {
3932 if(errno == 0 && sx->buffer[0] == '4')
3933 {
3934 errno = ERRNO_DATA4XX;
3935 addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3936 }
3937 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3938 if (sx->buffer[0] == '5' || addr->transport_return == OK)
3939 addr->transport_return = PENDING_OK; /* allow set_errno action */
3940 goto RESPONSE_FAILED;
3941 }
3942
3943 /* Append the overall response to the individual PRDR response for logging
3944 and update the journal, or setup retry. */
3945
3946 overall_message = string_printing(sx->buffer);
3947 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3948 if (addr->transport_return == OK)
3949 addr->message = string_sprintf("%s\\n%s", addr->message, overall_message);
3950
3951 for (address_item * addr = addrlist; addr != sx->first_addr; addr = addr->next)
3952 if (addr->transport_return == OK)
3953 {
3954 if (testflag(addr, af_homonym))
3955 sprintf(CS sx->buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3956 else
3957 sprintf(CS sx->buffer, "%.500s\n", addr->unique);
3958
3959 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx->buffer);
3960 len = Ustrlen(CS sx->buffer);
3961 if (write(journal_fd, sx->buffer, len) != len)
3962 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3963 "%s: %s", sx->buffer, strerror(errno));
3964 }
3965 else if (addr->transport_return == DEFER)
3966 retry_add_item(addr, addr->address_retry_key, -2);
3967 }
3968 #endif
3969
3970 /* Ensure the journal file is pushed out to disk. */
3971
3972 if (EXIMfsync(journal_fd) < 0)
3973 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3974 strerror(errno));
3975 }
3976 }
3977
3978
3979 /* Handle general (not specific to one address) failures here. The value of ok
3980 is used to skip over this code on the falling through case. A timeout causes a
3981 deferral. Other errors may defer or fail according to the response code, and
3982 may set up a special errno value, e.g. after connection chopped, which is
3983 assumed if errno == 0 and there is no text in the buffer. If control reaches
3984 here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3985 the problem is not related to this specific message. */
3986
3987 if (!sx->ok)
3988 {
3989 int code, set_rc;
3990 uschar * set_message;
3991
3992 RESPONSE_FAILED:
3993 {
3994 save_errno = errno;
3995 message = NULL;
3996 sx->send_quit = check_response(host, &save_errno, addrlist->more_errno,
3997 sx->buffer, &code, &message, &pass_message);
3998 goto FAILED;
3999 }
4000
4001 SEND_FAILED:
4002 {
4003 save_errno = errno;
4004 code = '4';
4005 message = string_sprintf("send() to %s [%s] failed: %s",
4006 host->name, host->address, message ? message : US strerror(save_errno));
4007 sx->send_quit = FALSE;
4008 goto FAILED;
4009 }
4010
4011 FAILED:
4012 {
4013 BOOL message_error;
4014
4015 sx->ok = FALSE; /* For when reached by GOTO */
4016 set_message = message;
4017
4018 /* We want to handle timeouts after MAIL or "." and loss of connection after
4019 "." specially. They can indicate a problem with the sender address or with
4020 the contents of the message rather than a real error on the connection. These
4021 cases are treated in the same way as a 4xx response. This next bit of code
4022 does the classification. */
4023
4024 switch(save_errno)
4025 {
4026 case 0:
4027 case ERRNO_MAIL4XX:
4028 case ERRNO_DATA4XX:
4029 message_error = TRUE;
4030 break;
4031
4032 case ETIMEDOUT:
4033 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
4034 Ustrncmp(smtp_command,"end ",4) == 0;
4035 break;
4036
4037 case ERRNO_SMTPCLOSED:
4038 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
4039 break;
4040
4041 default:
4042 message_error = FALSE;
4043 break;
4044 }
4045
4046 /* Handle the cases that are treated as message errors. These are:
4047
4048 (a) negative response or timeout after MAIL
4049 (b) negative response after DATA
4050 (c) negative response or timeout or dropped connection after "."
4051 (d) utf8 support required and not offered
4052
4053 It won't be a negative response or timeout after RCPT, as that is dealt
4054 with separately above. The action in all cases is to set an appropriate
4055 error code for all the addresses, but to leave yield set to OK because the
4056 host itself has not failed. Of course, it might in practice have failed
4057 when we've had a timeout, but if so, we'll discover that at the next
4058 delivery attempt. For a temporary error, set the message_defer flag, and
4059 write to the logs for information if this is not the last host. The error
4060 for the last host will be logged as part of the address's log line. */
4061
4062 if (message_error)
4063 {
4064 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
4065
4066 /* If there's an errno, the message contains just the identity of
4067 the host. */
4068
4069 if (code == '5')
4070 set_rc = FAIL;
4071 else /* Anything other than 5 is treated as temporary */
4072 {
4073 set_rc = DEFER;
4074 if (save_errno > 0)
4075 message = US string_sprintf("%s: %s", message, strerror(save_errno));
4076
4077 write_logs(host, message, sx->first_addr ? sx->first_addr->basic_errno : 0);
4078
4079 *message_defer = TRUE;
4080 }
4081 }
4082
4083 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
4084 ".", or some other transportation error. We defer all addresses and yield
4085 DEFER, except for the case of failed add_headers expansion, or a transport
4086 filter failure, when the yield should be ERROR, to stop it trying other
4087 hosts. */
4088
4089 else
4090 {
4091 #ifndef DISABLE_PIPE_CONNECT
4092 /* If we were early-pipelinng and the actual EHLO response did not match
4093 the cached value we assumed, we could have detected it and passed a
4094 custom errno through to here. It would be nice to RSET and retry right
4095 away, but to reliably do that we eould need an extra synch point before
4096 we committed to data and that would discard half the gained roundrips.
4097 Or we could summarily drop the TCP connection. but that is also ugly.
4098 Instead, we ignore the possibility (having freshened the cache) and rely
4099 on the server telling us with a nonmessage error if we have tried to
4100 do something it no longer supports. */
4101 #endif
4102 set_rc = DEFER;
4103 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
4104 save_errno == ERRNO_FILTER_FAIL) ? ERROR : DEFER;
4105 }
4106 }
4107
4108 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host,
4109 #ifdef EXPERIMENTAL_DSN_INFO
4110 sx->smtp_greeting, sx->helo_response,
4111 #endif
4112 &sx->delivery_start);
4113 }
4114
4115 /* If all has gone well, send_quit will be set TRUE, implying we can end the
4116 SMTP session tidily. However, if there were too many addresses to send in one
4117 message (indicated by first_addr being non-NULL) we want to carry on with the
4118 rest of them. Also, it is desirable to send more than one message down the SMTP
4119 connection if there are several waiting, provided we haven't already sent so
4120 many as to hit the configured limit. The function transport_check_waiting looks
4121 for a waiting message and returns its id. Then transport_pass_socket tries to
4122 set up a continued delivery by passing the socket on to another process. The
4123 variable send_rset is FALSE if a message has just been successfully transferred.
4124
4125 If we are already sending down a continued channel, there may be further
4126 addresses not yet delivered that are aimed at the same host, but which have not
4127 been passed in this run of the transport. In this case, continue_more will be
4128 true, and all we should do is send RSET if necessary, and return, leaving the
4129 channel open.
4130
4131 However, if no address was disposed of, i.e. all addresses got 4xx errors, we
4132 do not want to continue with other messages down the same channel, because that
4133 can lead to looping between two or more messages, all with the same,
4134 temporarily failing address(es). [The retry information isn't updated yet, so
4135 new processes keep on trying.] We probably also don't want to try more of this
4136 message's addresses either.
4137
4138 If we have started a TLS session, we have to end it before passing the
4139 connection to a new process. However, not all servers can handle this (Exim
4140 can), so we do not pass such a connection on if the host matches
4141 hosts_nopass_tls. */
4142
4143 DEBUG(D_transport)
4144 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
4145 "yield=%d first_address is %sNULL\n", sx->ok, sx->send_quit,
4146 sx->send_rset, f.continue_more, yield, sx->first_addr ? "not " : "");
4147
4148 if (sx->completed_addr && sx->ok && sx->send_quit)
4149 {
4150 BOOL more;
4151 smtp_compare_t t_compare;
4152
4153 t_compare.tblock = tblock;
4154 t_compare.current_sender_address = sender_address;
4155
4156 if ( sx->first_addr != NULL
4157 || f.continue_more
4158 || (
4159 #ifndef DISABLE_TLS
4160 ( tls_out.active.sock < 0 && !continue_proxy_cipher
4161 || verify_check_given_host(CUSS &ob->hosts_nopass_tls, host) != OK
4162 )
4163 &&
4164 #endif
4165 transport_check_waiting(tblock->name, host->name,
4166 tblock->connection_max_messages, new_message_id, &more,
4167 (oicf)smtp_are_same_identities, (void*)&t_compare)
4168 ) )
4169 {
4170 uschar *msg;
4171 BOOL pass_message;
4172
4173 if (sx->send_rset)
4174 if (! (sx->ok = smtp_write_command(sx, SCMD_FLUSH, "RSET\r\n") >= 0))
4175 {
4176 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
4177 host->address, strerror(errno));
4178 sx->send_quit = FALSE;
4179 }
4180 else if (! (sx->ok = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4181 '2', ob->command_timeout)))
4182 {
4183 int code;
4184 sx->send_quit = check_response(host, &errno, 0, sx->buffer, &code, &msg,
4185 &pass_message);
4186 if (!sx->send_quit)
4187 {
4188 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
4189 host->name, host->address, msg);
4190 }
4191 }
4192
4193 /* Either RSET was not needed, or it succeeded */
4194
4195 if (sx->ok)
4196 {
4197 #ifndef DISABLE_TLS
4198 int pfd[2];
4199 #endif
4200 int socket_fd = sx->cctx.sock;
4201
4202
4203 if (sx->first_addr != NULL) /* More addresses still to be sent */
4204 { /* in this run of the transport */
4205 continue_sequence++; /* Causes * in logging */
4206 pipelining_active = sx->pipelining_used; /* was cleared at DATA */
4207 goto SEND_MESSAGE;
4208 }
4209
4210 /* Unless caller said it already has more messages listed for this host,
4211 pass the connection on to a new Exim process (below, the call to
4212 transport_pass_socket). If the caller has more ready, just return with
4213 the connection still open. */
4214
4215 #ifndef DISABLE_TLS
4216 if (tls_out.active.sock >= 0)
4217 if ( f.continue_more
4218 || verify_check_given_host(CUSS &ob->hosts_noproxy_tls, host) == OK)
4219 {
4220 /* Before passing the socket on, or returning to caller with it still
4221 open, we must shut down TLS. Not all MTAs allow for the continuation
4222 of the SMTP session when TLS is shut down. We test for this by sending
4223 a new EHLO. If we don't get a good response, we don't attempt to pass
4224 the socket on. */
4225
4226 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_WAIT);
4227 sx->cctx.tls_ctx = NULL;
4228 smtp_peer_options = smtp_peer_options_wrap;
4229 sx->ok = !sx->smtps
4230 && smtp_write_command(sx, SCMD_FLUSH, "EHLO %s\r\n", sx->helo_data)
4231 >= 0
4232 && smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
4233 '2', ob->command_timeout);
4234
4235 if (sx->ok && f.continue_more)
4236 return yield; /* More addresses for another run */
4237 }
4238 else
4239 {
4240 /* Set up a pipe for proxying TLS for the new transport process */
4241
4242 smtp_peer_options |= OPTION_TLS;
4243 if ((sx->ok = socketpair(AF_UNIX, SOCK_STREAM, 0, pfd) == 0))
4244 socket_fd = pfd[1];
4245 else
4246 set_errno(sx->first_addr, errno, US"internal allocation problem",
4247 DEFER, FALSE, host,
4248 # ifdef EXPERIMENTAL_DSN_INFO
4249 sx->smtp_greeting, sx->helo_response,
4250 # endif
4251 &sx->delivery_start);
4252 }
4253 else
4254 #endif
4255 if (f.continue_more)
4256 return yield; /* More addresses for another run */
4257
4258 /* If the socket is successfully passed, we mustn't send QUIT (or
4259 indeed anything!) from here. */
4260
4261 /*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
4262 propagate it from the initial
4263 */
4264 if (sx->ok && transport_pass_socket(tblock->name, host->name,
4265 host->address, new_message_id, socket_fd))
4266 {
4267 sx->send_quit = FALSE;
4268
4269 /* We have passed the client socket to a fresh transport process.
4270 If TLS is still active, we need to proxy it for the transport we
4271 just passed the baton to. Fork a child to to do it, and return to
4272 get logging done asap. Which way to place the work makes assumptions
4273 about post-fork prioritisation which may not hold on all platforms. */
4274 #ifndef DISABLE_TLS
4275 if (tls_out.active.sock >= 0)
4276 {
4277 int pid = exim_fork(US"tls-proxy-interproc");
4278 if (pid == 0) /* child; fork again to disconnect totally */
4279 {
4280 /* does not return */
4281 smtp_proxy_tls(sx->cctx.tls_ctx, sx->buffer, sizeof(sx->buffer), pfd,
4282 ob->command_timeout);
4283 }
4284
4285 if (pid > 0) /* parent */
4286 {
4287 close(pfd[0]);
4288 /* tidy the inter-proc to disconn the proxy proc */
4289 waitpid(pid, NULL, 0);
4290 tls_close(sx->cctx.tls_ctx, TLS_NO_SHUTDOWN);
4291 sx->cctx.tls_ctx = NULL;
4292 (void)close(sx->cctx.sock);
4293 sx->cctx.sock = -1;
4294 continue_transport = NULL;
4295 continue_hostname = NULL;
4296 return yield;
4297 }
4298 log_write(0, LOG_PANIC_DIE, "fork failed");
4299 }
4300 #endif
4301 }
4302 }
4303
4304 /* If RSET failed and there are addresses left, they get deferred. */
4305 else
4306 set_errno(sx->first_addr, errno, msg, DEFER, FALSE, host,
4307 #ifdef EXPERIMENTAL_DSN_INFO
4308 sx->smtp_greeting, sx->helo_response,
4309 #endif
4310 &sx->delivery_start);
4311 }
4312 }
4313
4314 /* End off tidily with QUIT unless the connection has died or the socket has
4315 been passed to another process. There has been discussion on the net about what
4316 to do after sending QUIT. The wording of the RFC suggests that it is necessary
4317 to wait for a response, but on the other hand, there isn't anything one can do
4318 with an error response, other than log it. Exim used to do that. However,
4319 further discussion suggested that it is positively advantageous not to wait for
4320 the response, but to close the session immediately. This is supposed to move
4321 the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
4322 load from the server. (Hosts that are both servers and clients may not see much
4323 difference, of course.) Further discussion indicated that this was safe to do
4324 on Unix systems which have decent implementations of TCP/IP that leave the
4325 connection around for a while (TIME_WAIT) after the application has gone away.
4326 This enables the response sent by the server to be properly ACKed rather than
4327 timed out, as can happen on broken TCP/IP implementations on other OS.
4328
4329 This change is being made on 31-Jul-98. After over a year of trouble-free
4330 operation, the old commented-out code was removed on 17-Sep-99. */
4331
4332 SEND_QUIT:
4333 #ifdef TCP_CORK
4334 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_CORK, US &on, sizeof(on));
4335 #endif
4336 if (sx->send_quit) (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
4337
4338 END_OFF:
4339
4340 #ifndef DISABLE_TLS
4341 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
4342 sx->cctx.tls_ctx = NULL;
4343 #endif
4344
4345 /* Close the socket, and return the appropriate value, first setting
4346 works because the NULL setting is passed back to the calling process, and
4347 remote_max_parallel is forced to 1 when delivering over an existing connection,
4348
4349 If all went well and continue_more is set, we shouldn't actually get here if
4350 there are further addresses, as the return above will be taken. However,
4351 writing RSET might have failed, or there may be other addresses whose hosts are
4352 specified in the transports, and therefore not visible at top level, in which
4353 case continue_more won't get set. */
4354
4355 HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
4356 if (sx->send_quit)
4357 {
4358 shutdown(sx->cctx.sock, SHUT_WR);
4359 millisleep(20);
4360 testharness_pause_ms(200);
4361 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
4362 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
4363 i--; /* drain socket */
4364 }
4365 (void)close(sx->cctx.sock);
4366
4367 #ifndef DISABLE_EVENT
4368 (void) event_raise(tblock->event_action, US"tcp:close", NULL);
4369 #endif
4370
4371 continue_transport = NULL;
4372 continue_hostname = NULL;
4373 return yield;
4374 }
4375
4376
4377
4378
4379 /*************************************************
4380 * Closedown entry point *
4381 *************************************************/
4382
4383 /* This function is called when exim is passed an open smtp channel
4384 from another incarnation, but the message which it has been asked
4385 to deliver no longer exists. The channel is on stdin.
4386
4387 We might do fancy things like looking for another message to send down
4388 the channel, but if the one we sought has gone, it has probably been
4389 delivered by some other process that itself will seek further messages,
4390 so just close down our connection.
4391
4392 Argument: pointer to the transport instance block
4393 Returns: nothing
4394 */
4395
4396 void
4397 smtp_transport_closedown(transport_instance *tblock)
4398 {
4399 smtp_transport_options_block * ob = SOB tblock->options_block;
4400 client_conn_ctx cctx;
4401 smtp_context sx;
4402 uschar buffer[256];
4403 uschar inbuffer[4096];
4404 uschar outbuffer[16];
4405
4406 /*XXX really we need an active-smtp-client ctx, rather than assuming stdout */
4407 cctx.sock = fileno(stdin);
4408 cctx.tls_ctx = cctx.sock == tls_out.active.sock ? tls_out.active.tls_ctx : NULL;
4409
4410 sx.inblock.cctx = &cctx;
4411 sx.inblock.buffer = inbuffer;
4412 sx.inblock.buffersize = sizeof(inbuffer);
4413 sx.inblock.ptr = inbuffer;
4414 sx.inblock.ptrend = inbuffer;
4415
4416 sx.outblock.cctx = &cctx;
4417 sx.outblock.buffersize = sizeof(outbuffer);
4418 sx.outblock.buffer = outbuffer;
4419 sx.outblock.ptr = outbuffer;
4420 sx.outblock.cmd_count = 0;
4421 sx.outblock.authenticating = FALSE;
4422
4423 (void)smtp_write_command(&sx, SCMD_FLUSH, "QUIT\r\n");
4424 (void)smtp_read_response(&sx, buffer, sizeof(buffer), '2', ob->command_timeout);
4425 (void)close(cctx.sock);
4426 }
4427
4428
4429
4430 /*************************************************
4431 * Prepare addresses for delivery *
4432 *************************************************/
4433
4434 /* This function is called to flush out error settings from previous delivery
4435 attempts to other hosts. It also records whether we got here via an MX record
4436 or not in the more_errno field of the address. We are interested only in
4437 addresses that are still marked DEFER - others may have got delivered to a
4438 previously considered IP address. Set their status to PENDING_DEFER to indicate
4439 which ones are relevant this time.
4440
4441 Arguments:
4442 addrlist the list of addresses
4443 host the host we are delivering to
4444
4445 Returns: the first address for this delivery
4446 */
4447
4448 static address_item *
4449 prepare_addresses(address_item *addrlist, host_item *host)
4450 {
4451 address_item *first_addr = NULL;
4452 for (address_item * addr = addrlist; addr; addr = addr->next)
4453 if (addr->transport_return == DEFER)
4454 {
4455 if (!first_addr) first_addr = addr;
4456 addr->transport_return = PENDING_DEFER;
4457 addr->basic_errno = 0;
4458 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
4459 addr->message = NULL;
4460 #ifndef DISABLE_TLS
4461 addr->cipher = NULL;
4462 addr->ourcert = NULL;
4463 addr->peercert = NULL;
4464 addr->peerdn = NULL;
4465 addr->ocsp = OCSP_NOT_REQ;
4466 addr->tlsver = NULL;
4467 #endif
4468 #ifdef EXPERIMENTAL_DSN_INFO
4469 addr->smtp_greeting = NULL;
4470 addr->helo_response = NULL;
4471 #endif
4472 }
4473 return first_addr;
4474 }
4475
4476
4477
4478 /*************************************************
4479 * Main entry point *
4480 *************************************************/
4481
4482 /* See local README for interface details. As this is a remote transport, it is
4483 given a chain of addresses to be delivered in one connection, if possible. It
4484 always returns TRUE, indicating that each address has its own independent
4485 status set, except if there is a setting up problem, in which case it returns
4486 FALSE. */
4487
4488 BOOL
4489 smtp_transport_entry(
4490 transport_instance *tblock, /* data for this instantiation */
4491 address_item *addrlist) /* addresses we are working on */
4492 {
4493 int defport;
4494 int hosts_defer = 0;
4495 int hosts_fail = 0;
4496 int hosts_looked_up = 0;
4497 int hosts_retry = 0;
4498 int hosts_serial = 0;
4499 int hosts_total = 0;
4500 int total_hosts_tried = 0;
4501 BOOL expired = TRUE;
4502 uschar *expanded_hosts = NULL;
4503 uschar *pistring;
4504 uschar *tid = string_sprintf("%s transport", tblock->name);
4505 smtp_transport_options_block *ob = SOB tblock->options_block;
4506 host_item *hostlist = addrlist->host_list;
4507 host_item *host = NULL;
4508
4509 DEBUG(D_transport)
4510 {
4511 debug_printf("%s transport entered\n", tblock->name);
4512 for (address_item * addr = addrlist; addr; addr = addr->next)
4513 debug_printf(" %s\n", addr->address);
4514 if (hostlist)
4515 {
4516 debug_printf("hostlist:\n");
4517 for (host_item * host = hostlist; host; host = host->next)
4518 debug_printf(" '%s' IP %s port %d\n", host->name, host->address, host->port);
4519 }
4520 if (continue_hostname)
4521 debug_printf("already connected to %s [%s] (on fd %d)\n",
4522 continue_hostname, continue_host_address,
4523 cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0);
4524 }
4525
4526 /* Set the flag requesting that these hosts be added to the waiting
4527 database if the delivery fails temporarily or if we are running with
4528 queue_smtp or a 2-stage queue run. This gets unset for certain
4529 kinds of error, typically those that are specific to the message. */
4530
4531 update_waiting = TRUE;
4532
4533 /* If a host list is not defined for the addresses - they must all have the
4534 same one in order to be passed to a single transport - or if the transport has
4535 a host list with hosts_override set, use the host list supplied with the
4536 transport. It is an error for this not to exist. */
4537
4538 if (!hostlist || (ob->hosts_override && ob->hosts))
4539 {
4540 if (!ob->hosts)
4541 {
4542 addrlist->message = string_sprintf("%s transport called with no hosts set",
4543 tblock->name);
4544 addrlist->transport_return = PANIC;
4545 return FALSE; /* Only top address has status */
4546 }
4547
4548 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
4549 ob->hosts);
4550
4551 /* If the transport's host list contains no '$' characters, and we are not
4552 randomizing, it is fixed and therefore a chain of hosts can be built once
4553 and for all, and remembered for subsequent use by other calls to this
4554 transport. If, on the other hand, the host list does contain '$', or we are
4555 randomizing its order, we have to rebuild it each time. In the fixed case,
4556 as the hosts string will never be used again, it doesn't matter that we
4557 replace all the : characters with zeros. */
4558
4559 if (!ob->hostlist)
4560 {
4561 uschar *s = ob->hosts;
4562
4563 if (Ustrchr(s, '$') != NULL)
4564 {
4565 if (!(expanded_hosts = expand_string(s)))
4566 {
4567 addrlist->message = string_sprintf("failed to expand list of hosts "
4568 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
4569 addrlist->transport_return = f.search_find_defer ? DEFER : PANIC;
4570 return FALSE; /* Only top address has status */
4571 }
4572 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
4573 "\"%s\"\n", s, expanded_hosts);
4574 s = expanded_hosts;
4575 }
4576 else
4577 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
4578
4579 if (is_tainted(s))
4580 {
4581 log_write(0, LOG_MAIN|LOG_PANIC,
4582 "attempt to use tainted host list '%s' from '%s' in transport %s",
4583 s, ob->hosts, tblock->name);
4584 /* Avoid leaking info to an attacker */
4585 addrlist->message = US"internal configuration error";
4586 addrlist->transport_return = PANIC;
4587 return FALSE;
4588 }
4589
4590 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
4591
4592 /* Check that the expansion yielded something useful. */
4593 if (!hostlist)
4594 {
4595 addrlist->message =
4596 string_sprintf("%s transport has empty hosts setting", tblock->name);
4597 addrlist->transport_return = PANIC;
4598 return FALSE; /* Only top address has status */
4599 }
4600
4601 /* If there was no expansion of hosts, save the host list for
4602 next time. */
4603
4604 if (!expanded_hosts) ob->hostlist = hostlist;
4605 }
4606
4607 /* This is not the first time this transport has been run in this delivery;
4608 the host list was built previously. */
4609
4610 else
4611 hostlist = ob->hostlist;
4612 }
4613
4614 /* The host list was supplied with the address. If hosts_randomize is set, we
4615 must sort it into a random order if it did not come from MX records and has not
4616 already been randomized (but don't bother if continuing down an existing
4617 connection). */
4618
4619 else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continue_hostname)
4620 {
4621 host_item *newlist = NULL;
4622 while (hostlist)
4623 {
4624 host_item *h = hostlist;
4625 hostlist = hostlist->next;
4626
4627 h->sort_key = random_number(100);
4628
4629 if (!newlist)
4630 {
4631 h->next = NULL;
4632 newlist = h;
4633 }
4634 else if (h->sort_key < newlist->sort_key)
4635 {
4636 h->next = newlist;
4637 newlist = h;
4638 }
4639 else
4640 {
4641 host_item *hh = newlist;
4642 while (hh->next)
4643 {
4644 if (h->sort_key < hh->next->sort_key) break;
4645 hh = hh->next;
4646 }
4647 h->next = hh->next;
4648 hh->next = h;
4649 }
4650 }
4651
4652 hostlist = addrlist->host_list = newlist;
4653 }
4654
4655 /* Sort out the default port. */
4656
4657 if (!smtp_get_port(ob->port, addrlist, &defport, tid)) return FALSE;
4658
4659 /* For each host-plus-IP-address on the list:
4660
4661 . If this is a continued delivery and the host isn't the one with the
4662 current connection, skip.
4663
4664 . If the status is unusable (i.e. previously failed or retry checked), skip.
4665
4666 . If no IP address set, get the address, either by turning the name into
4667 an address, calling gethostbyname if gethostbyname is on, or by calling
4668 the DNS. The DNS may yield multiple addresses, in which case insert the
4669 extra ones into the list.
4670
4671 . Get the retry data if not previously obtained for this address and set the
4672 field which remembers the state of this address. Skip if the retry time is
4673 not reached. If not, remember whether retry data was found. The retry string
4674 contains both the name and the IP address.
4675
4676 . Scan the list of addresses and mark those whose status is DEFER as
4677 PENDING_DEFER. These are the only ones that will be processed in this cycle
4678 of the hosts loop.
4679
4680 . Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
4681 Some addresses may be successfully delivered, others may fail, and yet
4682 others may get temporary errors and so get marked DEFER.
4683
4684 . The return from the delivery attempt is OK if a connection was made and a
4685 valid SMTP dialogue was completed. Otherwise it is DEFER.
4686
4687 . If OK, add a "remove" retry item for this host/IPaddress, if any.
4688
4689 . If fail to connect, or other defer state, add a retry item.
4690
4691 . If there are any addresses whose status is still DEFER, carry on to the
4692 next host/IPaddress, unless we have tried the number of hosts given
4693 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
4694 there is some fancy logic for hosts_max_try that means its limit can be
4695 overstepped in some circumstances.
4696
4697 If we get to the end of the list, all hosts have deferred at least one address,
4698 or not reached their retry times. If delay_after_cutoff is unset, it requests a
4699 delivery attempt to those hosts whose last try was before the arrival time of
4700 the current message. To cope with this, we have to go round the loop a second
4701 time. After that, set the status and error data for any addresses that haven't
4702 had it set already. */
4703
4704 for (int cutoff_retry = 0;
4705 expired && cutoff_retry < (ob->delay_after_cutoff ? 1 : 2);
4706 cutoff_retry++)
4707 {
4708 host_item *nexthost = NULL;
4709 int unexpired_hosts_tried = 0;
4710 BOOL continue_host_tried = FALSE;
4711
4712 retry_non_continued:
4713 for (host = hostlist;
4714 host
4715 && unexpired_hosts_tried < ob->hosts_max_try
4716 && total_hosts_tried < ob->hosts_max_try_hardlimit;
4717 host = nexthost)
4718 {
4719 int rc;
4720 int host_af;
4721 BOOL host_is_expired = FALSE;
4722 BOOL message_defer = FALSE;
4723 BOOL some_deferred = FALSE;
4724 address_item *first_addr = NULL;
4725 uschar *interface = NULL;
4726 uschar *retry_host_key = NULL;
4727 uschar *retry_message_key = NULL;
4728 uschar *serialize_key = NULL;
4729
4730 /* Default next host is next host. :-) But this can vary if the
4731 hosts_max_try limit is hit (see below). It may also be reset if a host
4732 address is looked up here (in case the host was multihomed). */
4733
4734 nexthost = host->next;
4735
4736 /* If the address hasn't yet been obtained from the host name, look it up
4737 now, unless the host is already marked as unusable. If it is marked as
4738 unusable, it means that the router was unable to find its IP address (in
4739 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
4740 the lookup failed last time. We don't get this far if *all* MX records
4741 point to non-existent hosts; that is treated as a hard error.
4742
4743 We can just skip this host entirely. When the hosts came from the router,
4744 the address will timeout based on the other host(s); when the address is
4745 looked up below, there is an explicit retry record added.
4746
4747 Note that we mustn't skip unusable hosts if the address is not unset; they
4748 may be needed as expired hosts on the 2nd time round the cutoff loop. */
4749
4750 if (!host->address)
4751 {
4752 int new_port, flags;
4753
4754 if (host->status >= hstatus_unusable)
4755 {
4756 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
4757 host->name);
4758 continue;
4759 }
4760
4761 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
4762
4763 /* The host name is permitted to have an attached port. Find it, and
4764 strip it from the name. Just remember it for now. */
4765
4766 new_port = host_item_get_port(host);
4767
4768 /* Count hosts looked up */
4769
4770 hosts_looked_up++;
4771
4772 /* Find by name if so configured, or if it's an IP address. We don't
4773 just copy the IP address, because we need the test-for-local to happen. */
4774
4775 flags = HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
4776 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
4777 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
4778
4779 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
4780 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
4781 else
4782 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
4783 &ob->dnssec, /* domains for request/require */
4784 NULL, NULL);
4785
4786 /* Update the host (and any additional blocks, resulting from
4787 multihoming) with a host-specific port, if any. */
4788
4789 for (host_item * hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
4790
4791 /* Failure to find the host at this time (usually DNS temporary failure)
4792 is really a kind of routing failure rather than a transport failure.
4793 Therefore we add a retry item of the routing kind, not to stop us trying
4794 to look this name up here again, but to ensure the address gets timed
4795 out if the failures go on long enough. A complete failure at this point
4796 commonly points to a configuration error, but the best action is still
4797 to carry on for the next host. */
4798
4799 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_SECURITY || rc == HOST_FIND_FAILED)
4800 {
4801 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
4802 expired = FALSE;
4803 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
4804 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
4805 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
4806 host->status = hstatus_unusable;
4807
4808 for (address_item * addr = addrlist; addr; addr = addr->next)
4809 {
4810 if (addr->transport_return != DEFER) continue;
4811 addr->basic_errno = ERRNO_UNKNOWNHOST;
4812 addr->message = string_sprintf(
4813 rc == HOST_FIND_SECURITY
4814 ? "lookup of IP address for %s was insecure"
4815 : "failed to lookup IP address for %s",
4816 host->name);
4817 }
4818 continue;
4819 }
4820
4821 /* If the host is actually the local host, we may have a problem, or
4822 there may be some cunning configuration going on. In the problem case,
4823 log things and give up. The default transport status is already DEFER. */
4824
4825 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
4826 {
4827 for (address_item * addr = addrlist; addr; addr = addr->next)
4828 {
4829 addr->basic_errno = ERRNO_HOST_IS_LOCAL;
4830 addr->message = string_sprintf("%s transport found host %s to be "
4831 "local", tblock->name, host->name);
4832 }
4833 goto END_TRANSPORT;
4834 }
4835 } /* End of block for IP address lookup */
4836
4837 /* If this is a continued delivery, we are interested only in the host
4838 which matches the name of the existing open channel. The check is put
4839 here after the local host lookup, in case the name gets expanded as a
4840 result of the lookup. Set expired FALSE, to save the outer loop executing
4841 twice. */
4842
4843 if (continue_hostname)
4844 if ( Ustrcmp(continue_hostname, host->name) != 0
4845 || Ustrcmp(continue_host_address, host->address) != 0
4846 )
4847 {
4848 expired = FALSE;
4849 continue; /* With next host */
4850 }
4851 else
4852 continue_host_tried = TRUE;
4853
4854 /* Reset the default next host in case a multihomed host whose addresses
4855 are not looked up till just above added to the host list. */
4856
4857 nexthost = host->next;
4858
4859 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
4860 domain is in queue_smtp_domains, we don't actually want to attempt any
4861 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
4862 there is a lookup defer in queue_smtp_domains, proceed as if the domain
4863 were not in it. We don't want to hold up all SMTP deliveries! Except when
4864 doing a two-stage queue run, don't do this if forcing. */
4865
4866 if ( (!f.deliver_force || f.queue_2stage)
4867 && ( f.queue_smtp
4868 || match_isinlist(addrlist->domain,
4869 CUSS &queue_smtp_domains, 0,
4870 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)
4871 )
4872 {
4873 DEBUG(D_transport) debug_printf("first-pass routing only\n");
4874 expired = FALSE;
4875 for (address_item * addr = addrlist; addr; addr = addr->next)
4876 if (addr->transport_return == DEFER)
4877 addr->message = US"first-pass only routing due to -odqs, "
4878 "queue_smtp_domains or control=queue";
4879 continue; /* With next host */
4880 }
4881
4882 /* Count hosts being considered - purely for an intelligent comment
4883 if none are usable. */
4884
4885 hosts_total++;
4886
4887 /* Set $host and $host address now in case they are needed for the
4888 interface expansion or the serialize_hosts check; they remain set if an
4889 actual delivery happens. */
4890
4891 deliver_host = host->name;
4892 deliver_host_address = host->address;
4893 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
4894 : host->dnssec == DS_NO ? US"no"
4895 : US"";
4896
4897 /* Set up a string for adding to the retry key if the port number is not
4898 the standard SMTP port. A host may have its own port setting that overrides
4899 the default. */
4900
4901 pistring = string_sprintf(":%d", host->port == PORT_NONE
4902 ? defport : host->port);
4903 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
4904
4905 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
4906 string is set, even if constant (as different transports can have different
4907 constant settings), we must add it to the key that is used for retries,
4908 because connections to the same host from a different interface should be
4909 treated separately. */
4910
4911 host_af = Ustrchr(host->address, ':') == NULL ? AF_INET : AF_INET6;
4912 {
4913 uschar * s = ob->interface;
4914 if (s && *s)
4915 {
4916 if (!smtp_get_interface(s, host_af, addrlist, &interface, tid))
4917 return FALSE;
4918 pistring = string_sprintf("%s/%s", pistring, interface);
4919 }
4920 }
4921
4922 /* The first time round the outer loop, check the status of the host by
4923 inspecting the retry data. The second time round, we are interested only
4924 in expired hosts that haven't been tried since this message arrived. */
4925
4926 if (cutoff_retry == 0)
4927 {
4928 BOOL incl_ip;
4929 /* Ensure the status of the address is set by checking retry data if
4930 necessary. There may be host-specific retry data (applicable to all
4931 messages) and also data for retries of a specific message at this host.
4932 If either of these retry records are actually read, the keys used are
4933 returned to save recomputing them later. */
4934
4935 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
4936 US"retry_include_ip_address", ob->retry_include_ip_address,
4937 ob->expand_retry_include_ip_address, &incl_ip) != OK)
4938 continue; /* with next host */
4939
4940 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
4941 incl_ip, &retry_host_key, &retry_message_key);
4942
4943 DEBUG(D_transport) debug_printf("%s [%s]%s retry-status = %s\n", host->name,
4944 host->address ? host->address : US"", pistring,
4945 host->status == hstatus_usable ? "usable"
4946 : host->status == hstatus_unusable ? "unusable"
4947 : host->status == hstatus_unusable_expired ? "unusable (expired)" : "?");
4948
4949 /* Skip this address if not usable at this time, noting if it wasn't
4950 actually expired, both locally and in the address. */
4951
4952 switch (host->status)
4953 {
4954 case hstatus_unusable:
4955 expired = FALSE;
4956 setflag(addrlist, af_retry_skipped);
4957 /* Fall through */
4958
4959 case hstatus_unusable_expired:
4960 switch (host->why)
4961 {
4962 case hwhy_retry: hosts_retry++; break;
4963 case hwhy_failed: hosts_fail++; break;
4964 case hwhy_insecure:
4965 case hwhy_deferred: hosts_defer++; break;
4966 }
4967
4968 /* If there was a retry message key, implying that previously there
4969 was a message-specific defer, we don't want to update the list of
4970 messages waiting for these hosts. */
4971
4972 if (retry_message_key) update_waiting = FALSE;
4973 continue; /* With the next host or IP address */
4974 }
4975 }
4976
4977 /* Second time round the loop: if the address is set but expired, and
4978 the message is newer than the last try, let it through. */
4979
4980 else
4981 {
4982 if ( !host->address
4983 || host->status != hstatus_unusable_expired
4984 || host->last_try > received_time.tv_sec)
4985 continue;
4986 DEBUG(D_transport) debug_printf("trying expired host %s [%s]%s\n",
4987 host->name, host->address, pistring);
4988 host_is_expired = TRUE;
4989 }
4990
4991 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
4992 it remains TRUE only if all hosts are expired and none are actually tried.
4993 */
4994
4995 expired = FALSE;
4996
4997 /* If this host is listed as one to which access must be serialized,
4998 see if another Exim process has a connection to it, and if so, skip
4999 this host. If not, update the database to record our connection to it
5000 and remember this for later deletion. Do not do any of this if we are
5001 sending the message down a pre-existing connection. */
5002
5003 if ( !continue_hostname
5004 && verify_check_given_host(CUSS &ob->serialize_hosts, host) == OK)
5005 {
5006 serialize_key = string_sprintf("host-serialize-%s", host->name);
5007 if (!enq_start(serialize_key, 1))
5008 {
5009 DEBUG(D_transport)
5010 debug_printf("skipping host %s because another Exim process "
5011 "is connected to it\n", host->name);
5012 hosts_serial++;
5013 continue;
5014 }
5015 }
5016
5017 /* OK, we have an IP address that is not waiting for its retry time to
5018 arrive (it might be expired) OR (second time round the loop) we have an
5019 expired host that hasn't been tried since the message arrived. Have a go
5020 at delivering the message to it. First prepare the addresses by flushing
5021 out the result of previous attempts, and finding the first address that
5022 is still to be delivered. */
5023
5024 first_addr = prepare_addresses(addrlist, host);
5025
5026 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
5027 message_id, host->name, host->address, addrlist->address,
5028 addrlist->next ? ", ..." : "");
5029
5030 set_process_info("delivering %s to %s [%s]%s (%s%s)",
5031 message_id, host->name, host->address, pistring, addrlist->address,
5032 addrlist->next ? ", ..." : "");
5033
5034 /* This is not for real; don't do the delivery. If there are
5035 any remaining hosts, list them. */
5036
5037 if (f.dont_deliver)
5038 {
5039 struct timeval now;
5040 gettimeofday(&now, NULL);
5041 set_errno_nohost(addrlist, 0, NULL, OK, FALSE, &now);
5042 for (address_item * addr = addrlist; addr; addr = addr->next)
5043 {
5044 addr->host_used = host;
5045 addr->special_action = '*';
5046 addr->message = US"delivery bypassed by -N option";
5047 }
5048 DEBUG(D_transport)
5049 {
5050 debug_printf("*** delivery by %s transport bypassed by -N option\n"
5051 "*** host and remaining hosts:\n", tblock->name);
5052 for (host_item * host2 = host; host2; host2 = host2->next)
5053 debug_printf(" %s [%s]\n", host2->name,
5054 host2->address ? host2->address : US"unset");
5055 }
5056 rc = OK;
5057 }
5058
5059 /* This is for real. If the host is expired, we don't count it for
5060 hosts_max_retry. This ensures that all hosts must expire before an address
5061 is timed out, unless hosts_max_try_hardlimit (which protects against
5062 lunatic DNS configurations) is reached.
5063
5064 If the host is not expired and we are about to hit the hosts_max_retry
5065 limit, check to see if there is a subsequent hosts with a different MX
5066 value. If so, make that the next host, and don't count this one. This is a
5067 heuristic to make sure that different MXs do get tried. With a normal kind
5068 of retry rule, they would get tried anyway when the earlier hosts were
5069 delayed, but if the domain has a "retry every time" type of rule - as is
5070 often used for the the very large ISPs, that won't happen. */
5071
5072 else
5073 {
5074 host_item * thost;
5075 /* Make a copy of the host if it is local to this invocation
5076 of the transport. */
5077
5078 if (expanded_hosts)
5079 {
5080 thost = store_get(sizeof(host_item), FALSE);
5081 *thost = *host;
5082 thost->name = string_copy(host->name);
5083 thost->address = string_copy(host->address);
5084 }
5085 else
5086 thost = host;
5087
5088 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
5089 {
5090 DEBUG(D_transport)
5091 debug_printf("hosts_max_try limit reached with this host\n");
5092 for (host_item * h = host; h; h = h->next) if (h->mx != host->mx)
5093 {
5094 nexthost = h;
5095 unexpired_hosts_tried--;
5096 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
5097 "and will be tried\n");
5098 break;
5099 }
5100 }
5101
5102 /* Attempt the delivery. */
5103
5104 total_hosts_tried++;
5105 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5106 &message_defer, FALSE);
5107
5108 /* Yield is one of:
5109 OK => connection made, each address contains its result;
5110 message_defer is set for message-specific defers (when all
5111 recipients are marked defer)
5112 DEFER => there was a non-message-specific delivery problem;
5113 ERROR => there was a problem setting up the arguments for a filter,
5114 or there was a problem with expanding added headers
5115 */
5116
5117 /* If the result is not OK, there was a non-message-specific problem.
5118 If the result is DEFER, we need to write to the logs saying what happened
5119 for this particular host, except in the case of authentication and TLS
5120 failures, where the log has already been written. If all hosts defer a
5121 general message is written at the end. */
5122
5123 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL
5124 && first_addr->basic_errno != ERRNO_TLSFAILURE)
5125 write_logs(host, first_addr->message, first_addr->basic_errno);
5126
5127 #ifndef DISABLE_EVENT
5128 if (rc == DEFER)
5129 deferred_event_raise(first_addr, host, US"msg:host:defer");
5130 #endif
5131
5132 /* If STARTTLS was accepted, but there was a failure in setting up the
5133 TLS session (usually a certificate screwup), and the host is not in
5134 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
5135 TLS forcibly turned off. We have to start from scratch with a new SMTP
5136 connection. That's why the retry is done from here, not from within
5137 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
5138 session, so the in-clear transmission after those errors, if permitted,
5139 happens inside smtp_deliver().] */
5140
5141 #ifndef DISABLE_TLS
5142 if ( rc == DEFER
5143 && first_addr->basic_errno == ERRNO_TLSFAILURE
5144 && ob->tls_tempfail_tryclear
5145 && verify_check_given_host(CUSS &ob->hosts_require_tls, host) != OK
5146 )
5147 {
5148 log_write(0, LOG_MAIN,
5149 "%s: delivering unencrypted to H=%s [%s] (not in hosts_require_tls)",
5150 first_addr->message, host->name, host->address);
5151 first_addr = prepare_addresses(addrlist, host);
5152 rc = smtp_deliver(addrlist, thost, host_af, defport, interface, tblock,
5153 &message_defer, TRUE);
5154 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
5155 write_logs(host, first_addr->message, first_addr->basic_errno);
5156 # ifndef DISABLE_EVENT
5157 if (rc == DEFER)
5158 deferred_event_raise(first_addr, host, US"msg:host:defer");
5159 # endif
5160 }
5161 #endif /*DISABLE_TLS*/
5162
5163 #ifndef DISABLE_EVENT
5164 /* If the last host gave a defer raise a per-message event */
5165
5166 if ( !( nexthost
5167 && unexpired_hosts_tried < ob->hosts_max_try
5168 && total_hosts_tried < ob->hosts_max_try_hardlimit
5169 )
5170 && (message_defer || rc == DEFER)
5171 )
5172 deferred_event_raise(first_addr, host, US"msg:defer");
5173 #endif
5174 }
5175
5176 /* Delivery attempt finished */
5177
5178 set_process_info("delivering %s: just tried %s [%s]%s for %s%s: result %s",
5179 message_id, host->name, host->address, pistring, addrlist->address,
5180 addrlist->next ? " (& others)" : "", rc_to_string(rc));
5181
5182 /* Release serialization if set up */
5183
5184 if (serialize_key) enq_end(serialize_key);
5185
5186 /* If the result is DEFER, or if a host retry record is known to exist, we
5187 need to add an item to the retry chain for updating the retry database
5188 at the end of delivery. We only need to add the item to the top address,
5189 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
5190 for any other delivery attempts using the same address. (It is copied into
5191 the unusable tree at the outer level, so even if different address blocks
5192 contain the same address, it still won't get tried again.) */
5193
5194 if (rc == DEFER || retry_host_key)
5195 {
5196 int delete_flag = rc != DEFER ? rf_delete : 0;
5197 if (!retry_host_key)
5198 {
5199 BOOL incl_ip;
5200 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5201 US"retry_include_ip_address", ob->retry_include_ip_address,
5202 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5203 incl_ip = TRUE; /* error; use most-specific retry record */
5204
5205 retry_host_key = incl_ip
5206 ? string_sprintf("T:%S:%s%s", host->name, host->address, pistring)
5207 : string_sprintf("T:%S%s", host->name, pistring);
5208 }
5209
5210 /* If a delivery of another message over an existing SMTP connection
5211 yields DEFER, we do NOT set up retry data for the host. This covers the
5212 case when there are delays in routing the addresses in the second message
5213 that are so long that the server times out. This is alleviated by not
5214 routing addresses that previously had routing defers when handling an
5215 existing connection, but even so, this case may occur (e.g. if a
5216 previously happily routed address starts giving routing defers). If the
5217 host is genuinely down, another non-continued message delivery will
5218 notice it soon enough. */
5219
5220 if (delete_flag != 0 || !continue_hostname)
5221 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
5222
5223 /* We may have tried an expired host, if its retry time has come; ensure
5224 the status reflects the expiry for the benefit of any other addresses. */
5225
5226 if (rc == DEFER)
5227 {
5228 host->status = host_is_expired
5229 ? hstatus_unusable_expired : hstatus_unusable;
5230 host->why = hwhy_deferred;
5231 }
5232 }
5233
5234 /* If message_defer is set (host was OK, but every recipient got deferred
5235 because of some message-specific problem), or if that had happened
5236 previously so that a message retry key exists, add an appropriate item
5237 to the retry chain. Note that if there was a message defer but now there is
5238 a host defer, the message defer record gets deleted. That seems perfectly
5239 reasonable. Also, stop the message from being remembered as waiting
5240 for specific hosts. */
5241
5242 if (message_defer || retry_message_key)
5243 {
5244 int delete_flag = message_defer ? 0 : rf_delete;
5245 if (!retry_message_key)
5246 {
5247 BOOL incl_ip;
5248 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
5249 US"retry_include_ip_address", ob->retry_include_ip_address,
5250 ob->expand_retry_include_ip_address, &incl_ip) != OK)
5251 incl_ip = TRUE; /* error; use most-specific retry record */
5252
5253 retry_message_key = incl_ip
5254 ? string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
5255 message_id)
5256 : string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
5257 }
5258 retry_add_item(addrlist, retry_message_key,
5259 rf_message | rf_host | delete_flag);
5260 update_waiting = FALSE;
5261 }
5262
5263 /* Any return other than DEFER (that is, OK or ERROR) means that the
5264 addresses have got their final statuses filled in for this host. In the OK
5265 case, see if any of them are deferred. */
5266
5267 if (rc == OK)
5268 for (address_item * addr = addrlist; addr; addr = addr->next)
5269 if (addr->transport_return == DEFER)
5270 {
5271 some_deferred = TRUE;
5272 break;
5273 }
5274
5275 /* If no addresses deferred or the result was ERROR, return. We do this for
5276 ERROR because a failing filter set-up or add_headers expansion is likely to
5277 fail for any host we try. */
5278
5279 if (rc == ERROR || (rc == OK && !some_deferred))
5280 {
5281 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5282 return TRUE; /* Each address has its status */
5283 }
5284
5285 /* If the result was DEFER or some individual addresses deferred, let
5286 the loop run to try other hosts with the deferred addresses, except for the
5287 case when we were trying to deliver down an existing channel and failed.
5288 Don't try any other hosts in this case. */
5289
5290 if (continue_hostname) break;
5291
5292 /* If the whole delivery, or some individual addresses, were deferred and
5293 there are more hosts that could be tried, do not count this host towards
5294 the hosts_max_try limit if the age of the message is greater than the
5295 maximum retry time for this host. This means we may try try all hosts,
5296 ignoring the limit, when messages have been around for some time. This is
5297 important because if we don't try all hosts, the address will never time
5298 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
5299
5300 if ((rc == DEFER || some_deferred) && nexthost)
5301 {
5302 BOOL timedout;
5303 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
5304
5305 if (retry && retry->rules)
5306 {
5307 retry_rule *last_rule;
5308 for (last_rule = retry->rules;
5309 last_rule->next;
5310 last_rule = last_rule->next);
5311 timedout = time(NULL) - received_time.tv_sec > last_rule->timeout;
5312 }
5313 else timedout = TRUE; /* No rule => timed out */
5314
5315 if (timedout)
5316 {
5317 unexpired_hosts_tried--;
5318 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
5319 "hosts_max_try (message older than host's retry time)\n");
5320 }
5321 }
5322
5323 DEBUG(D_transport)
5324 {
5325 if (unexpired_hosts_tried >= ob->hosts_max_try)
5326 debug_printf("reached transport hosts_max_try limit %d\n",
5327 ob->hosts_max_try);
5328 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5329 debug_printf("reached transport hosts_max_try_hardlimit limit %d\n",
5330 ob->hosts_max_try_hardlimit);
5331 }
5332
5333 testharness_pause_ms(500); /* let server debug out */
5334 } /* End of loop for trying multiple hosts. */
5335
5336 /* If we failed to find a matching host in the list, for an already-open
5337 connection, just close it and start over with the list. This can happen
5338 for routing that changes from run to run, or big multi-IP sites with
5339 round-robin DNS. */
5340
5341 if (continue_hostname && !continue_host_tried)
5342 {
5343 int fd = cutthrough.cctx.sock >= 0 ? cutthrough.cctx.sock : 0;
5344
5345 DEBUG(D_transport) debug_printf("no hosts match already-open connection\n");
5346 #ifndef DISABLE_TLS
5347 /* A TLS conn could be open for a cutthrough, but not for a plain continued-
5348 transport */
5349 /*XXX doublecheck that! */
5350
5351 if (cutthrough.cctx.sock >= 0 && cutthrough.is_tls)
5352 {
5353 (void) tls_write(cutthrough.cctx.tls_ctx, US"QUIT\r\n", 6, FALSE);
5354 tls_close(cutthrough.cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
5355 cutthrough.cctx.tls_ctx = NULL;
5356 cutthrough.is_tls = FALSE;
5357 }
5358 else
5359 #else
5360 (void) write(fd, US"QUIT\r\n", 6);
5361 #endif
5362 (void) close(fd);
5363 cutthrough.cctx.sock = -1;
5364 continue_hostname = NULL;
5365 goto retry_non_continued;
5366 }
5367
5368 /* This is the end of the loop that repeats iff expired is TRUE and
5369 ob->delay_after_cutoff is FALSE. The second time round we will
5370 try those hosts that haven't been tried since the message arrived. */
5371
5372 DEBUG(D_transport)
5373 {
5374 debug_printf("all IP addresses skipped or deferred at least one address\n");
5375 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
5376 debug_printf("retrying IP addresses not tried since message arrived\n");
5377 }
5378 }
5379
5380
5381 /* Get here if all IP addresses are skipped or defer at least one address. In
5382 MUA wrapper mode, this will happen only for connection or other non-message-
5383 specific failures. Force the delivery status for all addresses to FAIL. */
5384
5385 if (mua_wrapper)
5386 {
5387 for (address_item * addr = addrlist; addr; addr = addr->next)
5388 addr->transport_return = FAIL;
5389 goto END_TRANSPORT;
5390 }
5391
5392 /* In the normal, non-wrapper case, add a standard message to each deferred
5393 address if there hasn't been an error, that is, if it hasn't actually been
5394 tried this time. The variable "expired" will be FALSE if any deliveries were
5395 actually tried, or if there was at least one host that was not expired. That
5396 is, it is TRUE only if no deliveries were tried and all hosts were expired. If
5397 a delivery has been tried, an error code will be set, and the failing of the
5398 message is handled by the retry code later.
5399
5400 If queue_smtp is set, or this transport was called to send a subsequent message
5401 down an existing TCP/IP connection, and something caused the host not to be
5402 found, we end up here, but can detect these cases and handle them specially. */
5403
5404 for (address_item * addr = addrlist; addr; addr = addr->next)
5405 {
5406 /* If host is not NULL, it means that we stopped processing the host list
5407 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
5408 means we need to behave as if some hosts were skipped because their retry
5409 time had not come. Specifically, this prevents the address from timing out.
5410 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
5411 hosts were tried. */
5412
5413 if (host)
5414 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
5415 {
5416 DEBUG(D_transport)
5417 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
5418 "hosts were tried\n");
5419 }
5420 else
5421 {
5422 DEBUG(D_transport)
5423 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
5424 setflag(addr, af_retry_skipped);
5425 }
5426
5427 if (f.queue_smtp) /* no deliveries attempted */
5428 {
5429 addr->transport_return = DEFER;
5430 addr->basic_errno = 0;
5431 addr->message = US"SMTP delivery explicitly queued";
5432 }
5433
5434 else if ( addr->transport_return == DEFER
5435 && (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0)
5436 && !addr->message
5437 )
5438 {
5439 addr->basic_errno = ERRNO_HRETRY;
5440 if (continue_hostname)
5441 addr->message = US"no host found for existing SMTP connection";
5442 else if (expired)
5443 {
5444 setflag(addr, af_pass_message); /* This is not a security risk */
5445 addr->message = string_sprintf(
5446 "all hosts%s have been failing for a long time %s",
5447 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"",
5448 ob->delay_after_cutoff
5449 ? US"(and retry time not reached)"
5450 : US"and were last tried after this message arrived");
5451
5452 /* If we are already using fallback hosts, or there are no fallback hosts
5453 defined, convert the result to FAIL to cause a bounce. */
5454
5455 if (addr->host_list == addr->fallback_hosts || !addr->fallback_hosts)
5456 addr->transport_return = FAIL;
5457 }
5458 else
5459 {
5460 const char * s;
5461 if (hosts_retry == hosts_total)
5462 s = "retry time not reached for any host%s";
5463 else if (hosts_fail == hosts_total)
5464 s = "all host address lookups%s failed permanently";
5465 else if (hosts_defer == hosts_total)
5466 s = "all host address lookups%s failed temporarily";
5467 else if (hosts_serial == hosts_total)
5468 s = "connection limit reached for all hosts%s";
5469 else if (hosts_fail+hosts_defer == hosts_total)
5470 s = "all host address lookups%s failed";
5471 else
5472 s = "some host address lookups failed and retry time "
5473 "not reached for other hosts or connection limit reached%s";
5474
5475 addr->message = string_sprintf(s,
5476 addr->domain ? string_sprintf(" for '%s'", addr->domain) : US"");
5477 }
5478 }
5479 }
5480
5481 /* Update the database which keeps information about which messages are waiting
5482 for which hosts to become available. For some message-specific errors, the
5483 update_waiting flag is turned off because we don't want follow-on deliveries in
5484 those cases. If this transport instance is explicitly limited to one message
5485 per connection then follow-on deliveries are not possible and there's no need
5486 to create/update the per-transport wait-<transport_name> database. */
5487
5488 if (update_waiting && tblock->connection_max_messages != 1)
5489 transport_update_waiting(hostlist, tblock->name);
5490
5491 END_TRANSPORT:
5492
5493 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
5494
5495 return TRUE; /* Each address has its status */
5496 }
5497
5498 #endif /*!MACRO_PREDEF*/
5499 /* vi: aw ai sw=2
5500 */
5501 /* End of transport/smtp.c */
Unnamed repository; edit this file 'description' to name the repository.