SOCKS: as a client, talk SMTP via a socks5 proxy. Bug 1590
[exim.git] / src / src / transports / smtp.c
CommitLineData
0756eb3c
PH
1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
5a66c31b 5/* Copyright (c) University of Cambridge 1995 - 2014 */
0756eb3c
PH
6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
11#define PENDING 256
12#define PENDING_DEFER (PENDING + DEFER)
13#define PENDING_OK (PENDING + OK)
14
15
16/* Options specific to the smtp transport. This transport also supports LMTP
17over TCP/IP. The options must be in alphabetic order (note that "_" comes
18before the lower case letters). Some live in the transport_instance block so as
19to be publicly visible; these are flagged with opt_public. */
20
21optionlist smtp_transport_options[] = {
506900af
JH
22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
9c695f6d
JH
24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
48c7f9e2
PH
27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
0756eb3c
PH
29 { "allow_localhost", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
31 { "authenticated_sender", opt_stringptr,
32 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
382afc6b
PH
33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
0756eb3c
PH
35 { "command_timeout", opt_time,
36 (void *)offsetof(smtp_transport_options_block, command_timeout) },
37 { "connect_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
39 { "connection_max_messages", opt_int | opt_public,
40 (void *)offsetof(transport_instance, connection_max_messages) },
41 { "data_timeout", opt_time,
42 (void *)offsetof(smtp_transport_options_block, data_timeout) },
43 { "delay_after_cutoff", opt_bool,
44 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 45#ifndef DISABLE_DKIM
f7572e5a
TK
46 { "dkim_canon", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
48 { "dkim_domain", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
50 { "dkim_private_key", opt_stringptr,
51 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
52 { "dkim_selector", opt_stringptr,
53 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
54 { "dkim_sign_headers", opt_stringptr,
55 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
56 { "dkim_strict", opt_stringptr,
57 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
80a47a2c 58#endif
0756eb3c
PH
59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
578897ea
JH
63 { "dnssec_request_domains", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
65 { "dnssec_require_domains", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
9e4f5962
PP
67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
0756eb3c
PH
69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
80a47a2c 75#ifdef SUPPORT_TLS
b1770b6e 76 /* These are no longer honoured, as of Exim 4.80; for now, we silently
2d571266 77 ignore; 4.83 will warn, and a later-still release will remove
17c76198 78 these options, so that using them becomes an error. */
83da1223
PH
79 { "gnutls_require_kx", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
81 { "gnutls_require_mac", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
83 { "gnutls_require_protocols", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
80a47a2c 85#endif
0756eb3c
PH
86 { "helo_data", opt_stringptr,
87 (void *)offsetof(smtp_transport_options_block, helo_data) },
88 { "hosts", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts) },
90 { "hosts_avoid_esmtp", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
c51b8e75
PH
92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 94#ifdef SUPPORT_TLS
0756eb3c
PH
95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 97#endif
0756eb3c
PH
98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
533244af
PH
100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 102#ifdef SUPPORT_TLS
0756eb3c
PH
103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 105#endif
0756eb3c
PH
106 { "hosts_override", opt_bool,
107 (void *)offsetof(smtp_transport_options_block, hosts_override) },
108 { "hosts_randomize", opt_bool,
109 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 110#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
44662487
JH
111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113#endif
0756eb3c
PH
114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 116#ifdef SUPPORT_TLS
7a31d643
JH
117# ifdef EXPERIMENTAL_DANE
118 { "hosts_require_dane", opt_stringptr,
119 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
120# endif
f2de3a33 121# ifndef DISABLE_OCSP
f5d78688
JH
122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124# endif
0756eb3c
PH
125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 127#endif
0756eb3c
PH
128 { "hosts_try_auth", opt_stringptr,
129 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
7a31d643 130#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
96e47838
TL
131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133#endif
8ccd00b1 134#ifndef DISABLE_PRDR
fd98a5c6
JH
135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137#endif
99400968
JH
138#ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141#endif
0756eb3c
PH
142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
f1513293
PH
146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
0756eb3c
PH
148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
506900af 150 { "multi_domain", opt_expand_bool | opt_public,
0756eb3c
PH
151 (void *)offsetof(transport_instance, multi_domain) },
152 { "port", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, port) },
154 { "protocol", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 156 { "retry_include_ip_address", opt_expand_bool,
0756eb3c
PH
157 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
158 { "serialize_hosts", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
160 { "size_addition", opt_int,
161 (void *)offsetof(smtp_transport_options_block, size_addition) }
7eb6c37c
JH
162#ifdef EXPERIMENTAL_SOCKS
163 ,{ "socks_proxy", opt_stringptr,
164 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
165#endif
80a47a2c 166#ifdef SUPPORT_TLS
0756eb3c
PH
167 ,{ "tls_certificate", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
169 { "tls_crl", opt_stringptr,
170 (void *)offsetof(smtp_transport_options_block, tls_crl) },
54c90be1
PP
171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
0756eb3c
PH
173 { "tls_privatekey", opt_stringptr,
174 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 175 { "tls_require_ciphers", opt_stringptr,
0756eb3c 176 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
3f0945ff
PP
177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
0756eb3c
PH
179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
a63be306
WB
181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
e51c7be2
JH
183 { "tls_verify_cert_hostnames", opt_stringptr,
184 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 185 { "tls_verify_certificates", opt_stringptr,
a63be306
WB
186 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
187 { "tls_verify_hosts", opt_stringptr,
188 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 189#endif
0756eb3c
PH
190};
191
192/* Size of the options list. An extern variable has to be used so that its
193address can appear in the tables drtables.c. */
194
195int smtp_transport_options_count =
196 sizeof(smtp_transport_options)/sizeof(optionlist);
197
198/* Default private options block for the smtp transport. */
199
200smtp_transport_options_block smtp_transport_option_defaults = {
201 NULL, /* hosts */
202 NULL, /* fallback_hosts */
203 NULL, /* hostlist */
204 NULL, /* fallback_hostlist */
205 NULL, /* authenticated_sender */
206 US"$primary_hostname", /* helo_data */
207 NULL, /* interface */
208 NULL, /* port */
209 US"smtp", /* protocol */
9e4f5962 210 NULL, /* DSCP */
0756eb3c
PH
211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
96e47838
TL
214#ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
7a31d643 216 NULL, /* hosts_require_dane */
96e47838 217#endif
8ccd00b1 218#ifndef DISABLE_PRDR
ad07e9ad 219 US"*", /* hosts_try_prdr */
fd98a5c6 220#endif
f2de3a33 221#ifndef DISABLE_OCSP
0e66b3b6 222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
f5d78688
JH
223 NULL, /* hosts_require_ocsp */
224#endif
0756eb3c
PH
225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
99400968 227 US"*", /* hosts_verify_avoid_tls */
c51b8e75 228 NULL, /* hosts_avoid_pipelining */
0756eb3c
PH
229 NULL, /* hosts_avoid_esmtp */
230 NULL, /* hosts_nopass_tls */
231 5*60, /* command_timeout */
232 5*60, /* connect_timeout; shorter system default overrides */
233 5*60, /* data timeout */
234 10*60, /* final timeout */
235 1024, /* size_addition */
236 5, /* hosts_max_try */
8e669ac1 237 50, /* hosts_max_try_hardlimit */
48c7f9e2 238 TRUE, /* address_retry_include_sender */
0756eb3c 239 FALSE, /* allow_localhost */
382afc6b 240 FALSE, /* authenticated_sender_force */
0756eb3c
PH
241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
578897ea
JH
244 NULL, /* dnssec_request_domains */
245 NULL, /* dnssec_require_domains */
0756eb3c
PH
246 TRUE, /* delay_after_cutoff */
247 FALSE, /* hosts_override */
248 FALSE, /* hosts_randomize */
249 TRUE, /* keepalive */
f1513293 250 FALSE, /* lmtp_ignore_quota */
9c695f6d 251 NULL, /* expand_retry_include_ip_address */
0756eb3c 252 TRUE /* retry_include_ip_address */
7eb6c37c
JH
253#ifdef EXPERIMENTAL_SOCKS
254#endif
255 ,NULL /* socks_proxy */
80a47a2c 256#ifdef SUPPORT_TLS
0756eb3c
PH
257 ,NULL, /* tls_certificate */
258 NULL, /* tls_crl */
259 NULL, /* tls_privatekey */
260 NULL, /* tls_require_ciphers */
83da1223
PH
261 NULL, /* gnutls_require_kx */
262 NULL, /* gnutls_require_mac */
263 NULL, /* gnutls_require_proto */
54c90be1 264 NULL, /* tls_sni */
0e0f3f56 265 US"system", /* tls_verify_certificates */
54c90be1
PP
266 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
267 /* tls_dh_min_bits */
a63be306
WB
268 TRUE, /* tls_tempfail_tryclear */
269 NULL, /* tls_verify_hosts */
610ff438 270 US"*", /* tls_try_verify_hosts */
01a4a5c5 271 US"*" /* tls_verify_cert_hostnames */
80a47a2c
TK
272#endif
273#ifndef DISABLE_DKIM
f7572e5a
TK
274 ,NULL, /* dkim_canon */
275 NULL, /* dkim_domain */
276 NULL, /* dkim_private_key */
277 NULL, /* dkim_selector */
278 NULL, /* dkim_sign_headers */
279 NULL /* dkim_strict */
80a47a2c 280#endif
0756eb3c
PH
281};
282
6c1c3d1d
WB
283/* some DSN flags for use later */
284
285static int rf_list[] = {rf_notify_never, rf_notify_success,
286 rf_notify_failure, rf_notify_delay };
287
45500060 288static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
6c1c3d1d
WB
289
290
0756eb3c
PH
291
292/* Local statics */
293
294static uschar *smtp_command; /* Points to last cmd for error messages */
295static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 296static BOOL update_waiting; /* TRUE to update the "wait" database */
0756eb3c
PH
297
298
299/*************************************************
300* Setup entry point *
301*************************************************/
302
303/* This function is called when the transport is about to be used,
304but before running it in a sub-process. It is used for two things:
305
306 (1) To set the fallback host list in addresses, when delivering.
26da7e20
PH
307 (2) To pass back the interface, port, protocol, and other options, for use
308 during callout verification.
0756eb3c
PH
309
310Arguments:
311 tblock pointer to the transport instance block
312 addrlist list of addresses about to be transported
313 tf if not NULL, pointer to block in which to return options
929ba01c
PH
314 uid the uid that will be set (not used)
315 gid the gid that will be set (not used)
0756eb3c
PH
316 errmsg place for error message (not used)
317
318Returns: OK always (FAIL, DEFER not used)
319*/
320
321static int
322smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 323 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c
PH
324{
325smtp_transport_options_block *ob =
326 (smtp_transport_options_block *)(tblock->options_block);
327
328errmsg = errmsg; /* Keep picky compilers happy */
929ba01c
PH
329uid = uid;
330gid = gid;
0756eb3c
PH
331
332/* Pass back options if required. This interface is getting very messy. */
333
334if (tf != NULL)
335 {
336 tf->interface = ob->interface;
337 tf->port = ob->port;
338 tf->protocol = ob->protocol;
339 tf->hosts = ob->hosts;
340 tf->hosts_override = ob->hosts_override;
341 tf->hosts_randomize = ob->hosts_randomize;
342 tf->gethostbyname = ob->gethostbyname;
343 tf->qualify_single = ob->dns_qualify_single;
344 tf->search_parents = ob->dns_search_parents;
26da7e20 345 tf->helo_data = ob->helo_data;
0756eb3c
PH
346 }
347
348/* Set the fallback host list for all the addresses that don't have fallback
349host lists, provided that the local host wasn't present in the original host
350list. */
351
352if (!testflag(addrlist, af_local_host_removed))
353 {
354 for (; addrlist != NULL; addrlist = addrlist->next)
355 if (addrlist->fallback_hosts == NULL)
356 addrlist->fallback_hosts = ob->fallback_hostlist;
357 }
358
359return OK;
360}
361
362
363
364/*************************************************
365* Initialization entry point *
366*************************************************/
367
368/* Called for each instance, after its options have been read, to
369enable consistency checks to be done, or anything else that needs
370to be set up.
371
372Argument: pointer to the transport instance block
373Returns: nothing
374*/
375
376void
377smtp_transport_init(transport_instance *tblock)
378{
379smtp_transport_options_block *ob =
380 (smtp_transport_options_block *)(tblock->options_block);
381
382/* Retry_use_local_part defaults FALSE if unset */
383
384if (tblock->retry_use_local_part == TRUE_UNSET)
385 tblock->retry_use_local_part = FALSE;
386
387/* Set the default port according to the protocol */
388
389if (ob->port == NULL)
061b7ebd
PP
390 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
391 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
0756eb3c
PH
392
393/* Set up the setup entry point, to be called before subprocesses for this
394transport. */
395
396tblock->setup = smtp_transport_setup;
397
398/* Complain if any of the timeouts are zero. */
399
400if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
401 ob->final_timeout <= 0)
402 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
403 "command, data, or final timeout value is zero for %s transport",
404 tblock->name);
405
406/* If hosts_override is set and there are local hosts, set the global
407flag that stops verify from showing router hosts. */
408
409if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
410
411/* If there are any fallback hosts listed, build a chain of host items
412for them, but do not do any lookups at this time. */
413
414host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
2d571266 415
32d07012 416#ifdef SUPPORT_TLS
2d571266
JH
417if ( ob->gnutls_require_kx
418 || ob->gnutls_require_mac
419 || ob->gnutls_require_proto)
420 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
421 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
422 " are obsolete\n");
32d07012 423#endif
0756eb3c
PH
424}
425
426
427
428
429
430/*************************************************
431* Set delivery info into all active addresses *
432*************************************************/
433
434/* Only addresses whose status is >= PENDING are relevant. A lesser
435status means that an address is not currently being processed.
436
437Arguments:
447d236c
PH
438 addrlist points to a chain of addresses
439 errno_value to put in each address's errno field
440 msg to put in each address's message field
441 rc to put in each address's transport_return field
442 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 443 host if set, mark addrs as having used this host
0756eb3c
PH
444
445If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
446the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
447this particular type of timeout.
448
449Returns: nothing
450*/
451
7cd1141b
PH
452static void
453set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
c562fd30 454 BOOL pass_message, host_item * host)
0756eb3c
PH
455{
456address_item *addr;
457int orvalue = 0;
458if (errno_value == ERRNO_CONNECTTIMEOUT)
459 {
460 errno_value = ETIMEDOUT;
461 orvalue = RTEF_CTOUT;
462 }
463for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b 464 if (addr->transport_return >= PENDING)
447d236c 465 {
168dec3b
JH
466 addr->basic_errno = errno_value;
467 addr->more_errno |= orvalue;
468 if (msg != NULL)
469 {
470 addr->message = msg;
471 if (pass_message) setflag(addr, af_pass_message);
472 }
473 addr->transport_return = rc;
474 if (host)
475 addr->host_used = host;
447d236c 476 }
0756eb3c
PH
477}
478
479
480
481/*************************************************
482* Check an SMTP response *
483*************************************************/
484
485/* This function is given an errno code and the SMTP response buffer
486to analyse, together with the host identification for generating messages. It
487sets an appropriate message and puts the first digit of the response code into
488the yield variable. If no response was actually read, a suitable digit is
489chosen.
490
491Arguments:
447d236c
PH
492 host the current host, to get its name for messages
493 errno_value pointer to the errno value
494 more_errno from the top address for use with ERRNO_FILTER_FAIL
495 buffer the SMTP response buffer
496 yield where to put a one-digit SMTP response code
497 message where to put an errror message
498 pass_message set TRUE if message is an SMTP response
499
500Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
501*/
502
a7538db1
JH
503static BOOL
504check_response(host_item *host, int *errno_value, int more_errno,
447d236c 505 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c
PH
506{
507uschar *pl = US"";
508
509if (smtp_use_pipelining &&
510 (Ustrcmp(smtp_command, "MAIL") == 0 ||
511 Ustrcmp(smtp_command, "RCPT") == 0 ||
512 Ustrcmp(smtp_command, "DATA") == 0))
513 pl = US"pipelined ";
514
515*yield = '4'; /* Default setting is to give a temporary error */
516
517/* Handle response timeout */
518
519if (*errno_value == ETIMEDOUT)
520 {
c562fd30
JH
521 *message = US string_sprintf("SMTP timeout after %s%s",
522 pl, smtp_command);
0756eb3c
PH
523 if (transport_count > 0)
524 *message = US string_sprintf("%s (%d bytes written)", *message,
525 transport_count);
526 return FALSE;
527 }
528
529/* Handle malformed SMTP response */
530
531if (*errno_value == ERRNO_SMTPFORMAT)
532 {
55414b25 533 const uschar *malfresp = string_printing(buffer);
0756eb3c 534 while (isspace(*malfresp)) malfresp++;
c562fd30
JH
535 *message = *malfresp == 0
536 ? string_sprintf("Malformed SMTP reply (an empty line) "
537 "in response to %s%s", pl, smtp_command)
538 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
539 pl, smtp_command, malfresp);
0756eb3c
PH
540 return FALSE;
541 }
542
543/* Handle a failed filter process error; can't send QUIT as we mustn't
544end the DATA. */
545
546if (*errno_value == ERRNO_FILTER_FAIL)
547 {
35af9f61 548 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 549 more_errno,
35af9f61 550 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
551 return FALSE;
552 }
553
554/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
555end the DATA. */
556
557if (*errno_value == ERRNO_CHHEADER_FAIL)
558 {
559 *message =
560 US string_sprintf("failed to expand headers_add or headers_remove: %s",
561 expand_string_message);
562 return FALSE;
563 }
564
565/* Handle failure to write a complete data block */
566
567if (*errno_value == ERRNO_WRITEINCOMPLETE)
568 {
569 *message = US string_sprintf("failed to write a data block");
570 return FALSE;
571 }
572
573/* Handle error responses from the remote mailer. */
574
575if (buffer[0] != 0)
576 {
55414b25 577 const uschar *s = string_printing(buffer);
447d236c 578 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 579 "%s", pl, smtp_command, s);
447d236c 580 *pass_message = TRUE;
0756eb3c
PH
581 *yield = buffer[0];
582 return TRUE;
583 }
584
585/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
586connection closed) case, which causes deferral. An explicit connection reset
587error has the same effect. Otherwise, put the host's identity in the message,
588leaving the errno value to be interpreted as well. In all cases, we have to
589assume the connection is now dead. */
0756eb3c 590
19b9dc85 591if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
592 {
593 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH
594 *message = US string_sprintf("Remote host closed connection "
595 "in response to %s%s", pl, smtp_command);
0756eb3c
PH
596 }
597else *message = US string_sprintf("%s [%s]", host->name, host->address);
598
599return FALSE;
600}
601
602
603
604/*************************************************
605* Write error message to logs *
606*************************************************/
607
608/* This writes to the main log and to the message log.
609
610Arguments:
611 addr the address item containing error information
612 host the current host
613
614Returns: nothing
615*/
616
617static void
618write_logs(address_item *addr, host_item *host)
619{
c562fd30
JH
620uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
621
622if (addr->message)
0756eb3c 623 {
c562fd30 624 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
629 }
630else
631 {
c562fd30
JH
632 if (log_extra_selector & LX_outgoing_port)
633 message = string_sprintf("%s:%d", message,
634 host->port == PORT_NONE ? 25 : host->port);
635 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
636 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
637 strerror(addr->basic_errno));
0756eb3c
PH
638 }
639}
640
c562fd30
JH
641static void
642msglog_line(host_item * host, uschar * message)
643{
644 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
645 host->name, host->address, message);
646}
647
0756eb3c
PH
648
649
774ef2d7 650#ifdef EXPERIMENTAL_EVENT
d68218c7
JH
651/*************************************************
652* Post-defer action *
653*************************************************/
654
655/* This expands an arbitrary per-transport string.
656 It might, for example, be used to write to the database log.
657
658Arguments:
d68218c7
JH
659 addr the address item containing error information
660 host the current host
661
662Returns: nothing
663*/
664
665static void
774ef2d7 666deferred_event_raise(address_item *addr, host_item *host)
d68218c7 667{
774ef2d7 668uschar * action = addr->transport->event_action;
55414b25 669const uschar * save_domain;
a7538db1
JH
670uschar * save_local;
671
d68218c7 672if (!action)
a7538db1 673 return;
d68218c7 674
a7538db1
JH
675save_domain = deliver_domain;
676save_local = deliver_localpart;
677
678/*XXX would ip & port already be set up? */
679deliver_host_address = string_copy(host->address);
774ef2d7
JH
680deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
681event_defer_errno = addr->basic_errno;
d68218c7
JH
682
683router_name = addr->router->name;
684transport_name = addr->transport->name;
a7538db1
JH
685deliver_domain = addr->domain;
686deliver_localpart = addr->local_part;
687
774ef2d7 688(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
689 addr->message
690 ? addr->basic_errno > 0
691 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
692 : string_copy(addr->message)
693 : addr->basic_errno > 0
694 ? string_copy(US strerror(addr->basic_errno))
695 : NULL);
696
697deliver_localpart = save_local;
698deliver_domain = save_domain;
d68218c7
JH
699router_name = transport_name = NULL;
700}
701#endif
702
703
704
0756eb3c
PH
705/*************************************************
706* Synchronize SMTP responses *
707*************************************************/
708
709/* This function is called from smtp_deliver() to receive SMTP responses from
710the server, and match them up with the commands to which they relate. When
711PIPELINING is not in use, this function is called after every command, and is
712therefore somewhat over-engineered, but it is simpler to use a single scheme
713that works both with and without PIPELINING instead of having two separate sets
714of code.
715
716The set of commands that are buffered up with pipelining may start with MAIL
717and may end with DATA; in between are RCPT commands that correspond to the
718addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
719etc.) are never buffered.
720
721Errors after MAIL or DATA abort the whole process leaving the response in the
722buffer. After MAIL, pending responses are flushed, and the original command is
723re-instated in big_buffer for error messages. For RCPT commands, the remote is
724permitted to reject some recipient addresses while accepting others. However
725certain errors clearly abort the whole process. Set the value in
726transport_return to PENDING_OK if the address is accepted. If there is a
727subsequent general error, it will get reset accordingly. If not, it will get
728converted to OK at the end.
729
730Arguments:
48c7f9e2
PH
731 addrlist the complete address list
732 include_affixes TRUE if affixes include in RCPT
733 sync_addr ptr to the ptr of the one to start scanning at (updated)
734 host the host we are connected to
735 count the number of responses to read
736 address_retry_
737 include_sender true if 4xx retry is to include the sender it its key
738 pending_MAIL true if the first response is for MAIL
739 pending_DATA 0 if last command sent was not DATA
740 +1 if previously had a good recipient
741 -1 if not previously had a good recipient
742 inblock incoming SMTP block
743 timeout timeout value
744 buffer buffer for reading response
745 buffsize size of buffer
0756eb3c
PH
746
747Returns: 3 if at least one address had 2xx and one had 5xx
748 2 if at least one address had 5xx but none had 2xx
749 1 if at least one host had a 2xx response, but none had 5xx
750 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
751 -1 timeout while reading RCPT response
752 -2 I/O or other non-response error for RCPT
753 -3 DATA or MAIL failed - errno and buffer set
754*/
755
756static int
757sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
758 address_item **sync_addr, host_item *host, int count,
759 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
760 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
761 int buffsize)
762{
763address_item *addr = *sync_addr;
764int yield = 0;
765
766/* Handle the response for a MAIL command. On error, reinstate the original
767command in big_buffer for error message use, and flush any further pending
768responses before returning, except after I/O errors and timeouts. */
769
770if (pending_MAIL)
771 {
772 count--;
773 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
774 {
775 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
776 if (errno == 0 && buffer[0] != 0)
777 {
778 uschar flushbuffer[4096];
e97957bc
PH
779 int save_errno = 0;
780 if (buffer[0] == '4')
781 {
782 save_errno = ERRNO_MAIL4XX;
783 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
784 }
0756eb3c
PH
785 while (count-- > 0)
786 {
787 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
788 '2', timeout)
789 && (errno != 0 || flushbuffer[0] == 0))
790 break;
791 }
e97957bc 792 errno = save_errno;
0756eb3c 793 }
c562fd30
JH
794
795 if (pending_DATA) count--; /* Number of RCPT responses to come */
796 while (count-- > 0) /* Mark any pending addrs with the host used */
797 {
798 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
799 addr->host_used = host;
800 addr = addr->next;
801 }
0756eb3c
PH
802 return -3;
803 }
804 }
805
806if (pending_DATA) count--; /* Number of RCPT responses to come */
807
808/* Read and handle the required number of RCPT responses, matching each one up
809with an address by scanning for the next address whose status is PENDING_DEFER.
810*/
811
812while (count-- > 0)
813 {
814 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
815
816 /* The address was accepted */
c562fd30 817 addr->host_used = host;
0756eb3c
PH
818
819 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
820 {
821 yield |= 1;
822 addr->transport_return = PENDING_OK;
823
824 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
825 ensure that any address-specific retry record is expunged. We do this both
826 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
827
828 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
829 {
830 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
831 sender_address);
832 retry_add_item(addr, altkey, rf_delete);
0756eb3c 833 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 834 }
0756eb3c
PH
835 }
836
837 /* Timeout while reading the response */
838
839 else if (errno == ETIMEDOUT)
840 {
c562fd30
JH
841 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
842 transport_rcpt_address(addr, include_affixes));
168dec3b 843 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
0756eb3c 844 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 845 update_waiting = FALSE;
0756eb3c
PH
846 return -1;
847 }
848
849 /* Handle other errors in obtaining an SMTP response by returning -1. This
850 will cause all the addresses to be deferred. Restore the SMTP command in
851 big_buffer for which we are checking the response, so the error message
852 makes sense. */
853
854 else if (errno != 0 || buffer[0] == 0)
855 {
856 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
857 transport_rcpt_address(addr, include_affixes));
858 return -2;
859 }
860
861 /* Handle SMTP permanent and temporary response codes. */
862
863 else
864 {
865 addr->message =
447d236c 866 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH
867 "%s", transport_rcpt_address(addr, include_affixes),
868 string_printing(buffer));
447d236c 869 setflag(addr, af_pass_message);
c562fd30 870 msglog_line(host, addr->message);
0756eb3c
PH
871
872 /* The response was 5xx */
873
874 if (buffer[0] == '5')
875 {
876 addr->transport_return = FAIL;
877 yield |= 2;
878 }
879
880 /* The response was 4xx */
881
882 else
883 {
0756eb3c
PH
884 addr->transport_return = DEFER;
885 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 886 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 887
c562fd30
JH
888 /* Log temporary errors if there are more hosts to be tried.
889 If not, log this last one in the == line. */
0756eb3c 890
c562fd30
JH
891 if (host->next)
892 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 893
f6c332bd
PH
894 /* Do not put this message on the list of those waiting for specific
895 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 896
f6c332bd 897 update_waiting = FALSE;
0756eb3c 898
48c7f9e2
PH
899 /* Add a retry item for the address so that it doesn't get tried again
900 too soon. If address_retry_include_sender is true, add the sender address
901 to the retry key. */
0756eb3c 902
48c7f9e2
PH
903 if (address_retry_include_sender)
904 {
905 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
906 sender_address);
907 retry_add_item(addr, altkey, 0);
908 }
909 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
910 }
911 }
912 } /* Loop for next RCPT response */
913
914/* Update where to start at for the next block of responses, unless we
915have already handled all the addresses. */
916
917if (addr != NULL) *sync_addr = addr->next;
918
919/* Handle a response to DATA. If we have not had any good recipients, either
920previously or in this block, the response is ignored. */
921
922if (pending_DATA != 0 &&
923 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
924 {
925 int code;
926 uschar *msg;
447d236c 927 BOOL pass_message;
e97957bc
PH
928 if (pending_DATA > 0 || (yield & 1) != 0)
929 {
930 if (errno == 0 && buffer[0] == '4')
931 {
932 errno = ERRNO_DATA4XX;
933 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
934 }
935 return -3;
936 }
447d236c 937 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
938 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
939 "is in use and there were no good recipients\n", msg);
940 }
941
942/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
943present) received 3xx. If any RCPTs were handled and yielded anything other
944than 4xx, yield will be set non-zero. */
945
946return yield;
947}
948
949
950
fcc8e047
JH
951/* Do the client side of smtp-level authentication */
952/*
953Arguments:
954 buffer EHLO response from server (gets overwritten)
955 addrlist chain of potential addresses to deliver
956 host host to deliver to
957 ob transport options
958 ibp, obp comms channel control blocks
959
960Returns:
961 OK Success, or failed (but not required): global "smtp_authenticated" set
962 DEFER Failed authentication (and was required)
963 ERROR Internal problem
964
965 FAIL_SEND Failed communications - transmit
966 FAIL - response
967*/
968
969int
970smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
971 smtp_transport_options_block *ob, BOOL is_esmtp,
972 smtp_inblock *ibp, smtp_outblock *obp)
973{
a7538db1
JH
974int require_auth;
975uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 976
a7538db1
JH
977smtp_authenticated = FALSE;
978client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 979require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 980
a7538db1
JH
981if (is_esmtp && !regex_AUTH) regex_AUTH =
982 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
983 FALSE, TRUE);
fcc8e047 984
a7538db1
JH
985if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
986 {
987 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
988 expand_nmax = -1; /* reset */
fcc8e047 989
a7538db1
JH
990 /* Must not do this check until after we have saved the result of the
991 regex match above. */
fcc8e047 992
a7538db1 993 if (require_auth == OK ||
5130845b 994 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
995 {
996 auth_instance *au;
997 fail_reason = US"no common mechanisms were found";
fcc8e047 998
a7538db1 999 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1000
a7538db1
JH
1001 /* Scan the configured authenticators looking for one which is configured
1002 for use as a client, which is not suppressed by client_condition, and
1003 whose name matches an authentication mechanism supported by the server.
1004 If one is found, attempt to authenticate by calling its client function.
1005 */
fcc8e047 1006
a7538db1
JH
1007 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1008 {
1009 uschar *p = names;
1010 if (!au->client ||
1011 (au->client_condition != NULL &&
1012 !expand_check_condition(au->client_condition, au->name,
1013 US"client authenticator")))
1014 {
1015 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1016 au->name,
1017 (au->client)? "client_condition is false" :
1018 "not configured as a client");
1019 continue;
1020 }
fcc8e047 1021
a7538db1 1022 /* Loop to scan supported server mechanisms */
fcc8e047 1023
a7538db1
JH
1024 while (*p != 0)
1025 {
1026 int rc;
1027 int len = Ustrlen(au->public_name);
1028 while (isspace(*p)) p++;
fcc8e047 1029
a7538db1
JH
1030 if (strncmpic(au->public_name, p, len) != 0 ||
1031 (p[len] != 0 && !isspace(p[len])))
1032 {
1033 while (*p != 0 && !isspace(*p)) p++;
1034 continue;
1035 }
fcc8e047 1036
a7538db1
JH
1037 /* Found data for a listed mechanism. Call its client entry. Set
1038 a flag in the outblock so that data is overwritten after sending so
1039 that reflections don't show it. */
fcc8e047 1040
a7538db1
JH
1041 fail_reason = US"authentication attempt(s) failed";
1042 obp->authenticating = TRUE;
1043 rc = (au->info->clientcode)(au, ibp, obp,
1044 ob->command_timeout, buffer, bufsize);
1045 obp->authenticating = FALSE;
1046 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1047 au->name, rc);
fcc8e047 1048
a7538db1
JH
1049 /* A temporary authentication failure must hold up delivery to
1050 this host. After a permanent authentication failure, we carry on
1051 to try other authentication methods. If all fail hard, try to
1052 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1053
a7538db1
JH
1054 switch(rc)
1055 {
1056 case OK:
1057 smtp_authenticated = TRUE; /* stops the outer loop */
1058 client_authenticator = au->name;
1059 if (au->set_client_id != NULL)
1060 client_authenticated_id = expand_string(au->set_client_id);
1061 break;
1062
1063 /* Failure after writing a command */
1064
1065 case FAIL_SEND:
1066 return FAIL_SEND;
1067
1068 /* Failure after reading a response */
1069
1070 case FAIL:
1071 if (errno != 0 || buffer[0] != '5') return FAIL;
1072 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1073 au->name, host->name, host->address, buffer);
1074 break;
1075
1076 /* Failure by some other means. In effect, the authenticator
1077 decided it wasn't prepared to handle this case. Typically this
1078 is the result of "fail" in an expansion string. Do we need to
1079 log anything here? Feb 2006: a message is now put in the buffer
1080 if logging is required. */
1081
1082 case CANCELLED:
1083 if (*buffer != 0)
1084 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1085 "authentication H=%s [%s] %s", au->name, host->name,
1086 host->address, buffer);
1087 break;
1088
1089 /* Internal problem, message in buffer. */
1090
1091 case ERROR:
168dec3b
JH
1092 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1093 DEFER, FALSE, NULL);
a7538db1
JH
1094 return ERROR;
1095 }
fcc8e047 1096
a7538db1
JH
1097 break; /* If not authenticated, try next authenticator */
1098 } /* Loop for scanning supported server mechanisms */
1099 } /* Loop for further authenticators */
fcc8e047 1100 }
a7538db1 1101 }
fcc8e047 1102
a7538db1 1103/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1104
a7538db1
JH
1105if (require_auth == OK && !smtp_authenticated)
1106 {
1107 set_errno(addrlist, ERRNO_AUTHFAIL,
1108 string_sprintf("authentication required but %s", fail_reason), DEFER,
c562fd30 1109 FALSE, NULL);
a7538db1
JH
1110 return DEFER;
1111 }
4d8d62b9 1112
a7538db1 1113return OK;
fcc8e047
JH
1114}
1115
1116
1117/* Construct AUTH appendix string for MAIL TO */
1118/*
1119Arguments
1120 buffer to build string
1121 addrlist chain of potential addresses to deliver
1122 ob transport options
1123
1124Globals smtp_authenticated
1125 client_authenticated_sender
1126Return True on error, otherwise buffer has (possibly empty) terminated string
1127*/
1128
1129BOOL
1130smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1131 smtp_transport_options_block *ob)
1132{
1133uschar *local_authenticated_sender = authenticated_sender;
1134
1135#ifdef notdef
1136 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1137#endif
1138
1139if (ob->authenticated_sender != NULL)
1140 {
1141 uschar *new = expand_string(ob->authenticated_sender);
1142 if (new == NULL)
1143 {
1144 if (!expand_string_forcedfail)
1145 {
1146 uschar *message = string_sprintf("failed to expand "
1147 "authenticated_sender: %s", expand_string_message);
168dec3b 1148 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
fcc8e047
JH
1149 return TRUE;
1150 }
1151 }
1152 else if (new[0] != 0) local_authenticated_sender = new;
1153 }
1154
1155/* Add the authenticated sender address if present */
1156
1157if ((smtp_authenticated || ob->authenticated_sender_force) &&
1158 local_authenticated_sender != NULL)
1159 {
1160 string_format(buffer, bufsize, " AUTH=%s",
1161 auth_xtextencode(local_authenticated_sender,
1162 Ustrlen(local_authenticated_sender)));
1163 client_authenticated_sender = string_copy(local_authenticated_sender);
1164 }
1165else
1166 *buffer= 0;
1167
1168return FALSE;
1169}
1170
1171
1172
0e66b3b6
JH
1173#ifdef EXPERIMENTAL_DANE
1174int
b8b1b5cb 1175tlsa_lookup(const host_item * host, dns_answer * dnsa,
0e66b3b6
JH
1176 BOOL dane_required, BOOL * dane)
1177{
1178/* move this out to host.c given the similarity to dns_lookup() ? */
1179uschar buffer[300];
55414b25 1180const uschar * fullname = buffer;
0e66b3b6
JH
1181
1182/* TLSA lookup string */
1183(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1184
1185switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1186 {
1187 case DNS_AGAIN:
1188 return DEFER; /* just defer this TLS'd conn */
1189
1190 default:
1191 case DNS_FAIL:
1192 if (dane_required)
1193 {
1194 log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
1195 return FAIL;
1196 }
1197 break;
1198
1199 case DNS_SUCCEED:
1200 if (!dns_is_secure(dnsa))
1201 {
1202 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1203 return DEFER;
1204 }
1205 *dane = TRUE;
1206 break;
1207 }
1208return OK;
1209}
1210#endif
1211
1212
0756eb3c
PH
1213/*************************************************
1214* Deliver address list to given host *
1215*************************************************/
1216
1217/* If continue_hostname is not null, we get here only when continuing to
1218deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1219input. TLS is never active on a passed channel; the previous process always
1220closes it down before passing the connection on.
0756eb3c
PH
1221
1222Otherwise, we have to make a connection to the remote host, and do the
1223initial protocol exchange.
1224
1225When running as an MUA wrapper, if the sender or any recipient is rejected,
1226temporarily or permanently, we force failure for all recipients.
1227
1228Arguments:
1229 addrlist chain of potential addresses to deliver; only those whose
1230 transport_return field is set to PENDING_DEFER are currently
1231 being processed; others should be skipped - they have either
1232 been delivered to an earlier host or IP address, or been
1233 failed by one of them.
1234 host host to deliver to
1235 host_af AF_INET or AF_INET6
2d280592 1236 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1237 interface interface to bind to, or NULL
1238 tblock transport instance block
0756eb3c
PH
1239 message_defer set TRUE if yield is OK, but all addresses were deferred
1240 because of a non-recipient, non-host failure, that is, a
1241 4xx response to MAIL FROM, DATA, or ".". This is a defer
1242 that is specific to the message.
1243 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1244 a second attempt after TLS initialization fails
1245
1246Returns: OK - the connection was made and the delivery attempted;
1247 the result for each address is in its data block.
1248 DEFER - the connection could not be made, or something failed
1249 while setting up the SMTP session, or there was a
1250 non-message-specific error, such as a timeout.
1251 ERROR - a filter command is specified for this transport,
1252 and there was a problem setting it up; OR helo_data
1253 or add_headers or authenticated_sender is specified
1254 for this transport, and the string failed to expand
1255*/
1256
1257static int
1258smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1259 uschar *interface, transport_instance *tblock,
0756eb3c
PH
1260 BOOL *message_defer, BOOL suppress_tls)
1261{
1262address_item *addr;
1263address_item *sync_addr;
1264address_item *first_addr = addrlist;
1265int yield = OK;
1266int address_count;
1267int save_errno;
1268int rc;
1269time_t start_delivery_time = time(NULL);
1270smtp_transport_options_block *ob =
1271 (smtp_transport_options_block *)(tblock->options_block);
1272BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1273BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1274BOOL ok = FALSE;
1275BOOL send_rset = TRUE;
1276BOOL send_quit = TRUE;
1277BOOL setting_up = TRUE;
1278BOOL completed_address = FALSE;
1279BOOL esmtp = TRUE;
1280BOOL pending_MAIL;
447d236c 1281BOOL pass_message = FALSE;
8ccd00b1 1282#ifndef DISABLE_PRDR
fd98a5c6
JH
1283BOOL prdr_offered = FALSE;
1284BOOL prdr_active;
1285#endif
6c1c3d1d 1286BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH
1287#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1288BOOL dane = FALSE;
6ebd79ec 1289BOOL dane_required;
0e66b3b6
JH
1290dns_answer tlsa_dnsa;
1291#endif
0756eb3c
PH
1292smtp_inblock inblock;
1293smtp_outblock outblock;
1294int max_rcpt = tblock->max_addresses;
f1513293 1295uschar *igquotstr = US"";
41c7c167 1296uschar *helo_data = NULL;
0756eb3c
PH
1297uschar *message = NULL;
1298uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1299uschar *p;
1300uschar buffer[4096];
1301uschar inbuffer[4096];
98470202 1302uschar outbuffer[4096];
0756eb3c
PH
1303
1304suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1305
1306*message_defer = FALSE;
1307smtp_command = US"initial connection";
1308if (max_rcpt == 0) max_rcpt = 999999;
1309
1310/* Set up the buffer for reading SMTP response packets. */
1311
1312inblock.buffer = inbuffer;
1313inblock.buffersize = sizeof(inbuffer);
1314inblock.ptr = inbuffer;
1315inblock.ptrend = inbuffer;
1316
1317/* Set up the buffer for holding SMTP commands while pipelining */
1318
1319outblock.buffer = outbuffer;
1320outblock.buffersize = sizeof(outbuffer);
1321outblock.ptr = outbuffer;
1322outblock.cmd_count = 0;
1323outblock.authenticating = FALSE;
1324
6c512171
PH
1325/* Reset the parameters of a TLS session. */
1326
817d9f57
JH
1327tls_out.bits = 0;
1328tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1329tls_out.ourcert = NULL;
1330tls_out.peercert = NULL;
817d9f57
JH
1331tls_out.peerdn = NULL;
1332#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1333tls_out.sni = NULL;
5b456975 1334#endif
018058b2 1335tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1336
35aba663
JH
1337/* Flip the legacy TLS-related variables over to the outbound set in case
1338they're used in the context of the transport. Don't bother resetting
1339afterward as we're in a subprocess. */
1340
1341tls_modify_variables(&tls_out);
1342
061b7ebd
PP
1343#ifndef SUPPORT_TLS
1344if (smtps)
1345 {
168dec3b
JH
1346 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1347 DEFER, FALSE, NULL);
018058b2 1348 return ERROR;
061b7ebd
PP
1349 }
1350#endif
1351
0756eb3c
PH
1352/* Make a connection to the host if this isn't a continued delivery, and handle
1353the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1354specially so they can be identified for retries. */
1355
1356if (continue_hostname == NULL)
1357 {
a7538db1 1358 /* This puts port into host->port */
0756eb3c 1359 inblock.sock = outblock.sock =
7eb6c37c 1360 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1361
0756eb3c
PH
1362 if (inblock.sock < 0)
1363 {
1364 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
c562fd30 1365 NULL, DEFER, FALSE, NULL);
0756eb3c
PH
1366 return DEFER;
1367 }
1368
0e66b3b6
JH
1369#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1370 {
0e66b3b6
JH
1371 tls_out.dane_verified = FALSE;
1372 tls_out.tlsa_usage = 0;
1373
5130845b 1374 dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH
1375
1376 if (host->dnssec == DS_YES)
1377 {
1378 if( dane_required
5130845b 1379 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
0e66b3b6
JH
1380 )
1381 if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK)
1382 return rc;
1383 }
1384 else if (dane_required)
1385 {
1386 log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name);
1387 return FAIL;
1388 }
1389
1390 if (dane)
1391 ob->tls_tempfail_tryclear = FALSE;
1392 }
1393#endif /*DANE*/
1394
41c7c167
PH
1395 /* Expand the greeting message while waiting for the initial response. (Makes
1396 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1397 delayed till here so that $sending_interface and $sending_port are set. */
1398
1399 helo_data = expand_string(ob->helo_data);
1400
0756eb3c
PH
1401 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1402 is nevertheless a reasonably clean way of programming this kind of logic,
1403 where you want to escape on any error. */
1404
061b7ebd
PP
1405 if (!smtps)
1406 {
1407 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1408 ob->command_timeout)) goto RESPONSE_FAILED;
0756eb3c 1409
774ef2d7 1410#ifdef EXPERIMENTAL_EVENT
b30275b8 1411 {
805c9d53
JH
1412 uschar * s;
1413 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1414 : host->dnssec==DS_NO ? US"no" : NULL;
1415 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1416 if (s)
a7538db1 1417 {
168dec3b 1418 set_errno(addrlist, ERRNO_EXPANDFAIL,
b30275b8
JH
1419 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1420 DEFER, FALSE, NULL);
a7538db1
JH
1421 yield = DEFER;
1422 goto SEND_QUIT;
1423 }
b30275b8 1424 }
a7538db1
JH
1425#endif
1426
061b7ebd
PP
1427 /* Now check if the helo_data expansion went well, and sign off cleanly if
1428 it didn't. */
41c7c167 1429
061b7ebd
PP
1430 if (helo_data == NULL)
1431 {
1432 uschar *message = string_sprintf("failed to expand helo_data: %s",
1433 expand_string_message);
168dec3b 1434 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
061b7ebd
PP
1435 yield = DEFER;
1436 goto SEND_QUIT;
1437 }
41c7c167
PH
1438 }
1439
0756eb3c
PH
1440/** Debugging without sending a message
1441addrlist->transport_return = DEFER;
1442goto SEND_QUIT;
1443**/
1444
1445 /* Errors that occur after this point follow an SMTP command, which is
1446 left in big_buffer by smtp_write_command() for use in error messages. */
1447
1448 smtp_command = big_buffer;
1449
1450 /* Tell the remote who we are...
1451
1452 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1453 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1454 greeting is of this form. The assumption was that the far end supports it
1455 properly... but experience shows that there are some that give 5xx responses,
1456 even though the banner includes "ESMTP" (there's a bloody-minded one that
1457 says "ESMTP not spoken here"). Cope with that case.
1458
1459 September 2000: Time has passed, and it seems reasonable now to always send
1460 EHLO at the start. It is also convenient to make the change while installing
1461 the TLS stuff.
1462
1463 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1464 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1465 would be no way to send out the mails, so there is now a host list
1466 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1467 PIPELINING problem as well. Maybe it can also be useful to cure other
1468 problems with broken servers.
1469
1470 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1471 Then somebody tried it with a Microsoft mailer... It seems that all other
1472 mailers use upper case for some reason (the RFC is quite clear about case
1473 independence) so, for peace of mind, I gave in. */
1474
5130845b 1475 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1476
061b7ebd
PP
1477 /* Alas; be careful, since this goto is not an error-out, so conceivably
1478 we might set data between here and the target which we assume to exist
1479 and be usable. I can see this coming back to bite us. */
a7538db1 1480#ifdef SUPPORT_TLS
061b7ebd
PP
1481 if (smtps)
1482 {
1483 tls_offered = TRUE;
1484 suppress_tls = FALSE;
1485 ob->tls_tempfail_tryclear = FALSE;
1486 smtp_command = US"SSL-on-connect";
1487 goto TLS_NEGOTIATE;
1488 }
a7538db1 1489#endif
061b7ebd 1490
0756eb3c
PH
1491 if (esmtp)
1492 {
1493 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1494 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1495 goto SEND_FAILED;
1496 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1497 ob->command_timeout))
1498 {
1499 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1500 esmtp = FALSE;
1501 }
1502 }
1503 else
1504 {
1505 DEBUG(D_transport)
1506 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1507 }
1508
1509 if (!esmtp)
1510 {
1511 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1512 goto SEND_FAILED;
1513 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1514 ob->command_timeout)) goto RESPONSE_FAILED;
1515 }
1516
f1513293
PH
1517 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1518 lmtp_ignore_quota option was set. */
1519
1520 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1521 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1522 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1523
0756eb3c
PH
1524 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1525
a7538db1 1526#ifdef SUPPORT_TLS
0756eb3c
PH
1527 tls_offered = esmtp &&
1528 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1529 PCRE_EOPT, NULL, 0) >= 0;
a7538db1 1530#endif
fd98a5c6 1531
a7538db1 1532#ifndef DISABLE_PRDR
5130845b
JH
1533 prdr_offered = esmtp
1534 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1535 PCRE_EOPT, NULL, 0) >= 0
1536 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH
1537
1538 if (prdr_offered)
1539 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
a7538db1 1540#endif
0756eb3c
PH
1541 }
1542
1543/* For continuing deliveries down the same channel, the socket is the standard
1544input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1545below). Set up the pointer to where subsequent commands will be left, for
1546error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1547set from the command line if they were set in the process that passed the
1548connection on. */
1549
1550else
1551 {
1552 inblock.sock = outblock.sock = fileno(stdin);
1553 smtp_command = big_buffer;
4311097e 1554 host->port = port; /* Record the port that was used */
0756eb3c
PH
1555 }
1556
1557/* If TLS is available on this connection, whether continued or not, attempt to
1558start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1559send another EHLO - the server may give a different answer in secure mode. We
1560use a separate buffer for reading the response to STARTTLS so that if it is
1561negative, the original EHLO data is available for subsequent analysis, should
1562the client not be required to use TLS. If the response is bad, copy the buffer
1563for error analysis. */
1564
1565#ifdef SUPPORT_TLS
5130845b
JH
1566if ( tls_offered
1567 && !suppress_tls
1568 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH
1569 {
1570 uschar buffer2[4096];
1571 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1572 goto SEND_FAILED;
1573
1574 /* If there is an I/O error, transmission of this message is deferred. If
1575 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1576 false, we also defer. However, if there is a temporary rejection of STARTTLS
1577 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1578 STARTTLS, we carry on. This means we will try to send the message in clear,
1579 unless the host is in hosts_require_tls (tested below). */
1580
1581 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1582 ob->command_timeout))
1583 {
0756eb3c
PH
1584 if (errno != 0 || buffer2[0] == 0 ||
1585 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK
1586 {
1587 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1588 goto RESPONSE_FAILED;
0dda4340 1589 }
0756eb3c
PH
1590 }
1591
1592 /* STARTTLS accepted: try to negotiate a TLS session. */
1593
1594 else
061b7ebd 1595 TLS_NEGOTIATE:
0756eb3c 1596 {
0e66b3b6
JH
1597 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1598# ifdef EXPERIMENTAL_DANE
1599 , dane ? &tlsa_dnsa : NULL
1600# endif
1601 );
0756eb3c
PH
1602
1603 /* TLS negotiation failed; give an error. From outside, this function may
1604 be called again to try in clear on a new connection, if the options permit
1605 it for this host. */
1606
1607 if (rc != OK)
1608 {
6ebd79ec
JH
1609# ifdef EXPERIMENTAL_DANE
1610 if (rc == DEFER && dane && !dane_required)
1611 {
1612 log_write(0, LOG_MAIN, "DANE attempt failed;"
1613 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1614 host->name, host->address);
1615 dane = FALSE;
1616 goto TLS_NEGOTIATE;
1617 }
1618# endif
1619
0756eb3c
PH
1620 save_errno = ERRNO_TLSFAILURE;
1621 message = US"failure while setting up TLS session";
1622 send_quit = FALSE;
1623 goto TLS_FAILED;
1624 }
1625
1626 /* TLS session is set up */
1627
1628 for (addr = addrlist; addr != NULL; addr = addr->next)
5ca2a9a1
PH
1629 if (addr->transport_return == PENDING_DEFER)
1630 {
817d9f57 1631 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1632 addr->ourcert = tls_out.ourcert;
1633 addr->peercert = tls_out.peercert;
817d9f57 1634 addr->peerdn = tls_out.peerdn;
018058b2 1635 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1636 }
0756eb3c
PH
1637 }
1638 }
1639
061b7ebd
PP
1640/* if smtps, we'll have smtp_command set to something else; always safe to
1641reset it here. */
1642smtp_command = big_buffer;
1643
41c7c167
PH
1644/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1645helo_data is null, we are dealing with a connection that was passed from
1646another process, and so we won't have expanded helo_data above. We have to
1647expand it here. $sending_ip_address and $sending_port are set up right at the
1648start of the Exim process (in exim.c). */
0756eb3c 1649
817d9f57 1650if (tls_out.active >= 0)
0756eb3c 1651 {
061b7ebd 1652 char *greeting_cmd;
41c7c167
PH
1653 if (helo_data == NULL)
1654 {
1655 helo_data = expand_string(ob->helo_data);
1656 if (helo_data == NULL)
1657 {
1658 uschar *message = string_sprintf("failed to expand helo_data: %s",
1659 expand_string_message);
168dec3b 1660 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
41c7c167
PH
1661 yield = DEFER;
1662 goto SEND_QUIT;
1663 }
1664 }
1665
0d0e4455 1666 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1667 if (smtps)
1668 {
1669 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1670 ob->command_timeout)) goto RESPONSE_FAILED;
0d0e4455
PP
1671 }
1672
1673 if (esmtp)
1674 greeting_cmd = "EHLO";
1675 else
1676 {
1677 greeting_cmd = "HELO";
1678 DEBUG(D_transport)
1679 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1680 }
1681
1682 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1683 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c
PH
1684 goto SEND_FAILED;
1685 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1686 ob->command_timeout))
1687 goto RESPONSE_FAILED;
1688 }
1689
1690/* If the host is required to use a secure channel, ensure that we
1691have one. */
1692
0e66b3b6
JH
1693else if (
1694# ifdef EXPERIMENTAL_DANE
1695 dane ||
1696# endif
5130845b 1697 verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1698 )
0756eb3c
PH
1699 {
1700 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1701 message = string_sprintf("a TLS session is required, but %s",
0756eb3c
PH
1702 tls_offered? "an attempt to start TLS failed" :
1703 "the server did not offer TLS support");
1704 goto TLS_FAILED;
1705 }
0e66b3b6 1706#endif /*SUPPORT_TLS*/
0756eb3c
PH
1707
1708/* If TLS is active, we have just started it up and re-done the EHLO command,
1709so its response needs to be analyzed. If TLS is not active and this is a
1710continued session down a previously-used socket, we haven't just done EHLO, so
1711we skip this. */
1712
1713if (continue_hostname == NULL
a7538db1 1714#ifdef SUPPORT_TLS
817d9f57 1715 || tls_out.active >= 0
a7538db1 1716#endif
0756eb3c
PH
1717 )
1718 {
f1513293
PH
1719 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1720 lmtp_ignore_quota option was set. */
1721
1722 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1723 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1724 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1725
0756eb3c
PH
1726 /* If the response to EHLO specified support for the SIZE parameter, note
1727 this, provided size_addition is non-negative. */
1728
1729 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1730 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1731 PCRE_EOPT, NULL, 0) >= 0;
1732
1733 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1734 the current host, esmtp will be false, so PIPELINING can never be used. If
1735 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1736
5130845b
JH
1737 smtp_use_pipelining = esmtp
1738 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1739 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1740 PCRE_EOPT, NULL, 0) >= 0;
0756eb3c
PH
1741
1742 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1743 smtp_use_pipelining? "" : "not ");
1744
8ccd00b1 1745#ifndef DISABLE_PRDR
5130845b
JH
1746 prdr_offered = esmtp
1747 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1748 PCRE_EOPT, NULL, 0) >= 0
1749 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH
1750
1751 if (prdr_offered)
1752 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1753#endif
1754
6c1c3d1d
WB
1755 /* Note if the server supports DSN */
1756 smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0,
1757 PCRE_EOPT, NULL, 0) >= 0;
1758 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
6c1c3d1d 1759
0756eb3c
PH
1760 /* Note if the response to EHLO specifies support for the AUTH extension.
1761 If it has, check that this host is one we want to authenticate to, and do
1762 the business. The host name and address must be available when the
1763 authenticator's client driver is running. */
1764
fcc8e047
JH
1765 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1766 ob, esmtp, &inblock, &outblock))
0756eb3c 1767 {
fcc8e047
JH
1768 default: goto SEND_QUIT;
1769 case OK: break;
1770 case FAIL_SEND: goto SEND_FAILED;
1771 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
1772 }
1773 }
1774
1775/* The setting up of the SMTP call is now complete. Any subsequent errors are
1776message-specific. */
1777
1778setting_up = FALSE;
1779
1780/* If there is a filter command specified for this transport, we can now
1781set it up. This cannot be done until the identify of the host is known. */
1782
1783if (tblock->filter_command != NULL)
1784 {
1785 BOOL rc;
1786 uschar buffer[64];
1787 sprintf(CS buffer, "%.50s transport", tblock->name);
1788 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1789 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 1790 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
1791
1792 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1793 yield ERROR. */
1794
1795 if (!rc)
1796 {
447d236c 1797 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
c562fd30 1798 FALSE, NULL);
0756eb3c
PH
1799 yield = ERROR;
1800 goto SEND_QUIT;
1801 }
1802 }
1803
1804
1805/* For messages that have more than the maximum number of envelope recipients,
1806we want to send several transactions down the same SMTP connection. (See
1807comments in deliver.c as to how this reconciles, heuristically, with
1808remote_max_parallel.) This optimization was added to Exim after the following
1809code was already working. The simplest way to put it in without disturbing the
1810code was to use a goto to jump back to this point when there is another
1811transaction to handle. */
1812
1813SEND_MESSAGE:
1814sync_addr = first_addr;
1815address_count = 0;
1816ok = FALSE;
1817send_rset = TRUE;
1818completed_address = FALSE;
1819
1820
1821/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1822qualification, send it, adding something to the message size to allow for
1823imprecision and things that get added en route. Exim keeps the number of lines
1824in a message, so we can give an accurate value for the original message, but we
1825need some additional to handle added headers. (Double "." characters don't get
1826included in the count.) */
1827
1828p = buffer;
1829*p = 0;
1830
1831if (smtp_use_size)
1832 {
1833 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1834 while (*p) p++;
1835 }
1836
8ccd00b1 1837#ifndef DISABLE_PRDR
fd98a5c6
JH
1838prdr_active = FALSE;
1839if (prdr_offered)
1840 {
1841 for (addr = first_addr; addr; addr = addr->next)
1842 if (addr->transport_return == PENDING_DEFER)
1843 {
1844 for (addr = addr->next; addr; addr = addr->next)
1845 if (addr->transport_return == PENDING_DEFER)
1846 { /* at least two recipients to send */
1847 prdr_active = TRUE;
1848 sprintf(CS p, " PRDR"); p += 5;
a7538db1 1849 break;
fd98a5c6
JH
1850 }
1851 break;
1852 }
1853 }
fd98a5c6
JH
1854#endif
1855
6c1c3d1d
WB
1856/* check if all addresses have lasthop flag */
1857/* do not send RET and ENVID if true */
1858dsn_all_lasthop = TRUE;
1859for (addr = first_addr;
1860 address_count < max_rcpt && addr != NULL;
1861 addr = addr->next)
1862 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1863 dsn_all_lasthop = FALSE;
1864
1865/* Add any DSN flags to the mail command */
1866
1867if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE))
1868 {
1869 if (dsn_ret == dsn_ret_hdrs)
1870 {
45500060 1871 Ustrcpy(p, " RET=HDRS");
6c1c3d1d
WB
1872 while (*p) p++;
1873 }
1874 else if (dsn_ret == dsn_ret_full)
1875 {
45500060 1876 Ustrcpy(p, " RET=FULL");
6c1c3d1d
WB
1877 while (*p) p++;
1878 }
1879 if (dsn_envid != NULL)
1880 {
1881 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
1882 while (*p) p++;
1883 }
1884 }
6c1c3d1d 1885
6b62e899
JH
1886/* If an authenticated_sender override has been specified for this transport
1887instance, expand it. If the expansion is forced to fail, and there was already
1888an authenticated_sender for this message, the original value will be used.
1889Other expansion failures are serious. An empty result is ignored, but there is
1890otherwise no check - this feature is expected to be used with LMTP and other
1891cases where non-standard addresses (e.g. without domains) might be required. */
1892
fcc8e047 1893if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH
1894 {
1895 yield = ERROR;
1896 goto SEND_QUIT;
1897 }
0756eb3c
PH
1898
1899/* From here until we send the DATA command, we can make use of PIPELINING
1900if the server host supports it. The code has to be able to check the responses
1901at any point, for when the buffer fills up, so we write it totally generally.
1902When PIPELINING is off, each command written reports that it has flushed the
1903buffer. */
1904
1905pending_MAIL = TRUE; /* The block starts with MAIL */
1906
1907rc = smtp_write_command(&outblock, smtp_use_pipelining,
1908 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1909mail_command = string_copy(big_buffer); /* Save for later error message */
1910
1911switch(rc)
1912 {
1913 case -1: /* Transmission error */
1914 goto SEND_FAILED;
1915
1916 case +1: /* Block was sent */
1917 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc
PH
1918 ob->command_timeout))
1919 {
1920 if (errno == 0 && buffer[0] == '4')
1921 {
1922 errno = ERRNO_MAIL4XX;
1923 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1924 }
1925 goto RESPONSE_FAILED;
1926 }
0756eb3c
PH
1927 pending_MAIL = FALSE;
1928 break;
1929 }
1930
1931/* Pass over all the relevant recipient addresses for this host, which are the
1932ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1933several before we have to read the responses for those seen so far. This
1934checking is done by a subroutine because it also needs to be done at the end.
1935Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1936the next one if not all are sent.
1937
1938In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1939last address because we want to abort if any recipients have any kind of
1940problem, temporary or permanent. We know that all recipient addresses will have
1941the PENDING_DEFER status, because only one attempt is ever made, and we know
1942that max_rcpt will be large, so all addresses will be done at once. */
1943
1944for (addr = first_addr;
1945 address_count < max_rcpt && addr != NULL;
1946 addr = addr->next)
1947 {
1948 int count;
1949 BOOL no_flush;
1950
a7538db1 1951 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 1952
0756eb3c
PH
1953 if (addr->transport_return != PENDING_DEFER) continue;
1954
1955 address_count++;
1956 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1957
6c1c3d1d
WB
1958 /* Add any DSN flags to the rcpt command and add to the sent string */
1959
1960 p = buffer;
1961 *p = 0;
1962
a7538db1 1963 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB
1964 {
1965 if ((addr->dsn_flags & rf_dsnflags) != 0)
1966 {
1967 int i;
1968 BOOL first = TRUE;
45500060 1969 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB
1970 while (*p) p++;
1971 for (i = 0; i < 4; i++)
6c1c3d1d
WB
1972 if ((addr->dsn_flags & rf_list[i]) != 0)
1973 {
1974 if (!first) *p++ = ',';
1975 first = FALSE;
45500060 1976 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB
1977 while (*p) p++;
1978 }
6c1c3d1d
WB
1979 }
1980
a7538db1
JH
1981 if (addr->dsn_orcpt != NULL)
1982 {
6c1c3d1d
WB
1983 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
1984 addr->dsn_orcpt);
1985 while (*p) p++;
1986 }
1987 }
6c1c3d1d 1988
0756eb3c
PH
1989 /* Now send the RCPT command, and process outstanding responses when
1990 necessary. After a timeout on RCPT, we just end the function, leaving the
1991 yield as OK, because this error can often mean that there is a problem with
1992 just one address, so we don't want to delay the host. */
1993
6c1c3d1d
WB
1994 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
1995 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
6c1c3d1d 1996
0756eb3c
PH
1997 if (count < 0) goto SEND_FAILED;
1998 if (count > 0)
1999 {
2000 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
2001 &sync_addr, host, count, ob->address_retry_include_sender,
2002 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2003 sizeof(buffer)))
0756eb3c
PH
2004 {
2005 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2006 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2007 break;
2008
2009 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2010 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2011 case 0: /* No 2xx or 5xx, but no probs */
2012 break;
2013
2014 case -1: goto END_OFF; /* Timeout on RCPT */
2015 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2016 }
2017 pending_MAIL = FALSE; /* Dealt with MAIL */
2018 }
2019 } /* Loop for next address */
2020
2021/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2022permanently or temporarily. We should have flushed and synced after the last
2023RCPT. */
2024
2025if (mua_wrapper)
2026 {
2027 address_item *badaddr;
168dec3b
JH
2028 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2029 if (badaddr->transport_return != PENDING_OK)
2030 {
2031 /*XXX could we find a better errno than 0 here? */
2032 set_errno(addrlist, 0, badaddr->message, FAIL,
2033 testflag(badaddr, af_pass_message), NULL);
2034 ok = FALSE;
2035 break;
2036 }
0756eb3c
PH
2037 }
2038
2039/* If ok is TRUE, we know we have got at least one good recipient, and must now
2040send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2041have a good recipient buffered up if we are pipelining. We don't want to waste
2042time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2043are pipelining. The responses are all handled by sync_responses(). */
2044
2045if (ok || (smtp_use_pipelining && !mua_wrapper))
2046 {
2047 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2048 if (count < 0) goto SEND_FAILED;
2049 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
2050 host, count, ob->address_retry_include_sender, pending_MAIL,
2051 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
2052 {
2053 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2054 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2055 break;
2056
2057 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2058 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2059 case 0: break; /* No 2xx or 5xx, but no probs */
2060
2061 case -1: goto END_OFF; /* Timeout on RCPT */
2062 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2063 }
2064 }
2065
2066/* Save the first address of the next batch. */
2067
2068first_addr = addr;
2069
2070/* If there were no good recipients (but otherwise there have been no
2071problems), just set ok TRUE, since we have handled address-specific errors
2072already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2073for handling the SMTP dot-handling protocol, flagging to apply to headers as
2074well as body. Set the appropriate timeout value to be used for each chunk.
2075(Haven't been able to make it work using select() for writing yet.) */
2076
2077if (!ok) ok = TRUE; else
2078 {
2079 sigalrm_seen = FALSE;
2080 transport_write_timeout = ob->data_timeout;
2081 smtp_command = US"sending data block"; /* For error messages */
2082 DEBUG(D_transport|D_v)
2083 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2084 transport_count = 0;
a7538db1 2085
80a47a2c 2086#ifndef DISABLE_DKIM
4cd12fe9
TK
2087 ok = dkim_transport_write_message(addrlist, inblock.sock,
2088 topt_use_crlf | topt_end_dot | topt_escape_headers |
2089 (tblock->body_only? topt_no_headers : 0) |
2090 (tblock->headers_only? topt_no_body : 0) |
2091 (tblock->return_path_add? topt_add_return_path : 0) |
2092 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2093 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2094 0, /* No size limit */
2095 tblock->add_headers, tblock->remove_headers,
2096 US".", US"..", /* Escaping strings */
2097 tblock->rewrite_rules, tblock->rewrite_existflags,
2098 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2099 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK
2100 );
2101#else
0756eb3c
PH
2102 ok = transport_write_message(addrlist, inblock.sock,
2103 topt_use_crlf | topt_end_dot | topt_escape_headers |
2104 (tblock->body_only? topt_no_headers : 0) |
2105 (tblock->headers_only? topt_no_body : 0) |
2106 (tblock->return_path_add? topt_add_return_path : 0) |
2107 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2108 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2109 0, /* No size limit */
2110 tblock->add_headers, tblock->remove_headers,
2111 US".", US"..", /* Escaping strings */
2112 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2113#endif
0756eb3c
PH
2114
2115 /* transport_write_message() uses write() because it is called from other
2116 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2117 it can exit with "Broken pipe" as its error. This really means that the
2118 socket got closed at the far end. */
2119
2120 transport_write_timeout = 0; /* for subsequent transports */
2121
2122 /* Failure can either be some kind of I/O disaster (including timeout),
2123 or the failure of a transport filter or the expansion of added headers. */
2124
2125 if (!ok)
2126 {
2127 buffer[0] = 0; /* There hasn't been a response */
2128 goto RESPONSE_FAILED;
2129 }
2130
2131 /* We used to send the terminating "." explicitly here, but because of
2132 buffering effects at both ends of TCP/IP connections, you don't gain
2133 anything by keeping it separate, so it might as well go in the final
2134 data buffer for efficiency. This is now done by setting the topt_end_dot
2135 flag above. */
2136
2137 smtp_command = US"end of data";
2138
8ccd00b1 2139#ifndef DISABLE_PRDR
fd98a5c6
JH
2140 /* For PRDR we optionally get a partial-responses warning
2141 * followed by the individual responses, before going on with
2142 * the overall response. If we don't get the warning then deal
2143 * with per non-PRDR. */
2144 if(prdr_active)
2145 {
2146 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2147 ob->final_timeout);
2148 if (!ok && errno == 0)
2149 switch(buffer[0])
2150 {
2151 case '2': prdr_active = FALSE;
2152 ok = TRUE;
2153 break;
2154 case '4': errno = ERRNO_DATA4XX;
2155 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2156 break;
2157 }
2158 }
2159 else
2160#endif
2161
2162 /* For non-PRDR SMTP, we now read a single response that applies to the
2163 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2164
e97957bc
PH
2165 if (!lmtp)
2166 {
2167 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2168 ob->final_timeout);
2169 if (!ok && errno == 0 && buffer[0] == '4')
2170 {
2171 errno = ERRNO_DATA4XX;
2172 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2173 }
2174 }
0756eb3c
PH
2175
2176 /* For LMTP, we get back a response for every RCPT command that we sent;
2177 some may be accepted and some rejected. For those that get a response, their
2178 status is fixed; any that are accepted have been handed over, even if later
2179 responses crash - at least, that's how I read RFC 2033.
2180
2181 If all went well, mark the recipient addresses as completed, record which
2182 host/IPaddress they were delivered to, and cut out RSET when sending another
2183 message down the same channel. Write the completed addresses to the journal
2184 now so that they are recorded in case there is a crash of hardware or
2185 software before the spool gets updated. Also record the final SMTP
2186 confirmation if needed (for SMTP only). */
2187
2188 if (ok)
2189 {
2190 int flag = '=';
2191 int delivery_time = (int)(time(NULL) - start_delivery_time);
2192 int len;
0756eb3c
PH
2193 uschar *conf = NULL;
2194 send_rset = FALSE;
2195
0756eb3c
PH
2196 /* Set up confirmation if needed - applies only to SMTP */
2197
d68218c7 2198 if (
774ef2d7 2199#ifndef EXPERIMENTAL_EVENT
d68218c7 2200 (log_extra_selector & LX_smtp_confirmation) != 0 &&
a7538db1 2201#endif
d68218c7
JH
2202 !lmtp
2203 )
0756eb3c 2204 {
55414b25
JH
2205 const uschar *s = string_printing(buffer);
2206 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2207 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
2208 }
2209
fd98a5c6 2210 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2211 each one. */
2212
2213 for (addr = addrlist; addr != first_addr; addr = addr->next)
2214 {
2215 if (addr->transport_return != PENDING_OK) continue;
2216
2217 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2218 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2219 address. For temporary errors, add a retry item for the address so that
2220 it doesn't get tried again too soon. */
0756eb3c 2221
8ccd00b1 2222#ifndef DISABLE_PRDR
fd98a5c6
JH
2223 if (lmtp || prdr_active)
2224#else
0756eb3c 2225 if (lmtp)
fd98a5c6 2226#endif
0756eb3c
PH
2227 {
2228 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2229 ob->final_timeout))
2230 {
2231 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2232 addr->message = string_sprintf(
8ccd00b1 2233#ifndef DISABLE_PRDR
fd98a5c6
JH
2234 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2235#else
2236 "LMTP error after %s: %s",
2237#endif
0756eb3c 2238 big_buffer, string_printing(buffer));
75def545
PH
2239 setflag(addr, af_pass_message); /* Allow message to go to user */
2240 if (buffer[0] == '5')
2241 addr->transport_return = FAIL;
2242 else
2243 {
e97957bc
PH
2244 errno = ERRNO_DATA4XX;
2245 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2246 addr->transport_return = DEFER;
8ccd00b1 2247#ifndef DISABLE_PRDR
fd98a5c6
JH
2248 if (!prdr_active)
2249#endif
2250 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2251 }
0756eb3c
PH
2252 continue;
2253 }
2254 completed_address = TRUE; /* NOW we can set this flag */
c0ea85ab
TF
2255 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2256 {
55414b25
JH
2257 const uschar *s = string_printing(buffer);
2258 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2259 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2260 }
0756eb3c
PH
2261 }
2262
2263 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2264 actual host that was used. */
0756eb3c
PH
2265
2266 addr->transport_return = OK;
2267 addr->more_errno = delivery_time;
d427a7f9 2268 addr->host_used = host;
0756eb3c
PH
2269 addr->special_action = flag;
2270 addr->message = conf;
8ccd00b1 2271#ifndef DISABLE_PRDR
fd98a5c6
JH
2272 if (prdr_active) addr->flags |= af_prdr_used;
2273#endif
0756eb3c
PH
2274 flag = '-';
2275
8ccd00b1 2276#ifndef DISABLE_PRDR
fd98a5c6
JH
2277 if (!prdr_active)
2278#endif
2279 {
2280 /* Update the journal. For homonymic addresses, use the base address plus
2281 the transport name. See lots of comments in deliver.c about the reasons
2282 for the complications when homonyms are involved. Just carry on after
2283 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2284
fd98a5c6
JH
2285 if (testflag(addr, af_homonym))
2286 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2287 else
2288 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2289
fd98a5c6
JH
2290 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2291 len = Ustrlen(CS buffer);
2292 if (write(journal_fd, buffer, len) != len)
2293 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2294 "%s: %s", buffer, strerror(errno));
2295 }
0756eb3c
PH
2296 }
2297
8ccd00b1 2298#ifndef DISABLE_PRDR
fd98a5c6
JH
2299 if (prdr_active)
2300 {
2301 /* PRDR - get the final, overall response. For any non-success
2302 upgrade all the address statuses. */
2303 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2304 ob->final_timeout);
2305 if (!ok)
2306 {
2307 if(errno == 0 && buffer[0] == '4')
2308 {
2309 errno = ERRNO_DATA4XX;
2310 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2311 }
2312 for (addr = addrlist; addr != first_addr; addr = addr->next)
2313 if (buffer[0] == '5' || addr->transport_return == OK)
2314 addr->transport_return = PENDING_OK; /* allow set_errno action */
2315 goto RESPONSE_FAILED;
2316 }
2317
2318 /* Update the journal, or setup retry. */
2319 for (addr = addrlist; addr != first_addr; addr = addr->next)
2320 if (addr->transport_return == OK)
2321 {
2322 if (testflag(addr, af_homonym))
2323 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2324 else
2325 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2326
fd98a5c6
JH
2327 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2328 len = Ustrlen(CS buffer);
2329 if (write(journal_fd, buffer, len) != len)
2330 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2331 "%s: %s", buffer, strerror(errno));
2332 }
2333 else if (addr->transport_return == DEFER)
2334 retry_add_item(addr, addr->address_retry_key, -2);
2335 }
2336#endif
2337
0756eb3c
PH
2338 /* Ensure the journal file is pushed out to disk. */
2339
54fc8428 2340 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2341 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2342 strerror(errno));
2343 }
2344 }
2345
2346
2347/* Handle general (not specific to one address) failures here. The value of ok
2348is used to skip over this code on the falling through case. A timeout causes a
2349deferral. Other errors may defer or fail according to the response code, and
2350may set up a special errno value, e.g. after connection chopped, which is
2351assumed if errno == 0 and there is no text in the buffer. If control reaches
2352here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2353the problem is not related to this specific message. */
2354
2355if (!ok)
2356 {
2357 int code;
2358
2359 RESPONSE_FAILED:
2360 save_errno = errno;
2361 message = NULL;
2362 send_quit = check_response(host, &save_errno, addrlist->more_errno,
447d236c 2363 buffer, &code, &message, &pass_message);
0756eb3c
PH
2364 goto FAILED;
2365
2366 SEND_FAILED:
2367 save_errno = errno;
2368 code = '4';
2369 message = US string_sprintf("send() to %s [%s] failed: %s",
2370 host->name, host->address, strerror(save_errno));
2371 send_quit = FALSE;
2372 goto FAILED;
2373
2374 /* This label is jumped to directly when a TLS negotiation has failed,
2375 or was not done for a host for which it is required. Values will be set
2376 in message and save_errno, and setting_up will always be true. Treat as
2377 a temporary error. */
2378
a7538db1 2379#ifdef SUPPORT_TLS
0756eb3c
PH
2380 TLS_FAILED:
2381 code = '4';
a7538db1 2382#endif
0756eb3c
PH
2383
2384 /* If the failure happened while setting up the call, see if the failure was
2385 a 5xx response (this will either be on connection, or following HELO - a 5xx
2386 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2387 never going to accept them. For other errors during setting up (timeouts or
2388 whatever), defer all addresses, and yield DEFER, so that the host is not
2389 tried again for a while. */
2390
2391 FAILED:
2392 ok = FALSE; /* For when reached by GOTO */
2393
2394 if (setting_up)
2395 {
2396 if (code == '5')
c562fd30 2397 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
0756eb3c
PH
2398 else
2399 {
c562fd30 2400 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
0756eb3c
PH
2401 yield = DEFER;
2402 }
2403 }
2404
e97957bc 2405 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2406 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2407 the contents of the message rather than a real error on the connection. These
2408 cases are treated in the same way as a 4xx response. This next bit of code
2409 does the classification. */
0756eb3c 2410
e97957bc 2411 else
0756eb3c 2412 {
e97957bc 2413 BOOL message_error;
0756eb3c 2414
e97957bc
PH
2415 switch(save_errno)
2416 {
2417 case 0:
2418 case ERRNO_MAIL4XX:
2419 case ERRNO_DATA4XX:
2420 message_error = TRUE;
2421 break;
0756eb3c 2422
e97957bc
PH
2423 case ETIMEDOUT:
2424 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2425 Ustrncmp(smtp_command,"end ",4) == 0;
2426 break;
2427
2428 case ERRNO_SMTPCLOSED:
2429 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2430 break;
2431
2432 default:
2433 message_error = FALSE;
2434 break;
2435 }
0756eb3c 2436
e97957bc 2437 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2438
e97957bc
PH
2439 (a) negative response or timeout after MAIL
2440 (b) negative response after DATA
2441 (c) negative response or timeout or dropped connection after "."
0756eb3c 2442
e97957bc
PH
2443 It won't be a negative response or timeout after RCPT, as that is dealt
2444 with separately above. The action in all cases is to set an appropriate
2445 error code for all the addresses, but to leave yield set to OK because the
2446 host itself has not failed. Of course, it might in practice have failed
2447 when we've had a timeout, but if so, we'll discover that at the next
2448 delivery attempt. For a temporary error, set the message_defer flag, and
2449 write to the logs for information if this is not the last host. The error
2450 for the last host will be logged as part of the address's log line. */
2451
2452 if (message_error)
0756eb3c 2453 {
e97957bc
PH
2454 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2455 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
c562fd30 2456 pass_message, host);
e97957bc
PH
2457
2458 /* If there's an errno, the message contains just the identity of
2459 the host. */
2460
2461 if (code != '5') /* Anything other than 5 is treated as temporary */
2462 {
2463 if (save_errno > 0)
2464 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2465 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2466 msglog_line(host, message);
e97957bc
PH
2467 *message_defer = TRUE;
2468 }
2469 }
2470
2471 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2472 ".", or some other transportation error. We defer all addresses and yield
2473 DEFER, except for the case of failed add_headers expansion, or a transport
2474 filter failure, when the yield should be ERROR, to stop it trying other
2475 hosts. */
2476
2477 else
2478 {
2479 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2480 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
c562fd30 2481 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
0756eb3c
PH
2482 }
2483 }
2484 }
2485
2486
2487/* If all has gone well, send_quit will be set TRUE, implying we can end the
2488SMTP session tidily. However, if there were too many addresses to send in one
2489message (indicated by first_addr being non-NULL) we want to carry on with the
2490rest of them. Also, it is desirable to send more than one message down the SMTP
2491connection if there are several waiting, provided we haven't already sent so
2492many as to hit the configured limit. The function transport_check_waiting looks
2493for a waiting message and returns its id. Then transport_pass_socket tries to
2494set up a continued delivery by passing the socket on to another process. The
2495variable send_rset is FALSE if a message has just been successfully transfered.
2496
2497If we are already sending down a continued channel, there may be further
2498addresses not yet delivered that are aimed at the same host, but which have not
2499been passed in this run of the transport. In this case, continue_more will be
2500true, and all we should do is send RSET if necessary, and return, leaving the
2501channel open.
2502
2503However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2504do not want to continue with other messages down the same channel, because that
2505can lead to looping between two or more messages, all with the same,
2506temporarily failing address(es). [The retry information isn't updated yet, so
2507new processes keep on trying.] We probably also don't want to try more of this
2508message's addresses either.
2509
2510If we have started a TLS session, we have to end it before passing the
2511connection to a new process. However, not all servers can handle this (Exim
2512can), so we do not pass such a connection on if the host matches
2513hosts_nopass_tls. */
2514
2515DEBUG(D_transport)
2516 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2517 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2518 continue_more, yield, (first_addr == NULL)? "":"not ");
2519
2520if (completed_address && ok && send_quit)
2521 {
2522 BOOL more;
5130845b
JH
2523 if ( first_addr != NULL
2524 || continue_more
2525 || ( ( tls_out.active < 0
2526 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2527 )
0756eb3c
PH
2528 &&
2529 transport_check_waiting(tblock->name, host->name,
2530 tblock->connection_max_messages, new_message_id, &more)
5130845b 2531 ) )
0756eb3c
PH
2532 {
2533 uschar *msg;
447d236c 2534 BOOL pass_message;
0756eb3c
PH
2535
2536 if (send_rset)
2537 {
2538 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2539 {
2540 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2541 host->address, strerror(save_errno));
2542 send_quit = FALSE;
2543 }
2544 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2545 ob->command_timeout)))
2546 {
2547 int code;
447d236c
PH
2548 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2549 &pass_message);
0756eb3c
PH
2550 if (!send_quit)
2551 {
c562fd30
JH
2552 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2553 host->name, host->address, msg);
0756eb3c
PH
2554 }
2555 }
2556 }
2557
2558 /* Either RSET was not needed, or it succeeded */
2559
2560 if (ok)
2561 {
2562 if (first_addr != NULL) /* More addresses still to be sent */
2563 { /* in this run of the transport */
2564 continue_sequence++; /* Causes * in logging */
2565 goto SEND_MESSAGE;
2566 }
2567 if (continue_more) return yield; /* More addresses for another run */
2568
2569 /* Pass the socket to a new Exim process. Before doing so, we must shut
2570 down TLS. Not all MTAs allow for the continuation of the SMTP session
2571 when TLS is shut down. We test for this by sending a new EHLO. If we
2572 don't get a good response, we don't attempt to pass the socket on. */
2573
a7538db1 2574#ifdef SUPPORT_TLS
817d9f57 2575 if (tls_out.active >= 0)
0756eb3c 2576 {
817d9f57 2577 tls_close(FALSE, TRUE);
061b7ebd
PP
2578 if (smtps)
2579 ok = FALSE;
2580 else
2581 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2582 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2583 ob->command_timeout);
0756eb3c 2584 }
a7538db1 2585#endif
0756eb3c
PH
2586
2587 /* If the socket is successfully passed, we musn't send QUIT (or
2588 indeed anything!) from here. */
2589
2590 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2591 new_message_id, inblock.sock))
2592 {
2593 send_quit = FALSE;
2594 }
2595 }
2596
2597 /* If RSET failed and there are addresses left, they get deferred. */
2598
c562fd30 2599 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
0756eb3c
PH
2600 }
2601 }
2602
2603/* End off tidily with QUIT unless the connection has died or the socket has
2604been passed to another process. There has been discussion on the net about what
2605to do after sending QUIT. The wording of the RFC suggests that it is necessary
2606to wait for a response, but on the other hand, there isn't anything one can do
2607with an error response, other than log it. Exim used to do that. However,
2608further discussion suggested that it is positively advantageous not to wait for
2609the response, but to close the session immediately. This is supposed to move
2610the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2611load from the server. (Hosts that are both servers and clients may not see much
2612difference, of course.) Further discussion indicated that this was safe to do
2613on Unix systems which have decent implementations of TCP/IP that leave the
2614connection around for a while (TIME_WAIT) after the application has gone away.
2615This enables the response sent by the server to be properly ACKed rather than
2616timed out, as can happen on broken TCP/IP implementations on other OS.
2617
2618This change is being made on 31-Jul-98. After over a year of trouble-free
2619operation, the old commented-out code was removed on 17-Sep-99. */
2620
2621SEND_QUIT:
2622if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2623
2624END_OFF:
2625
2626#ifdef SUPPORT_TLS
817d9f57 2627tls_close(FALSE, TRUE);
0756eb3c
PH
2628#endif
2629
2630/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2631works because the NULL setting is passed back to the calling process, and
2632remote_max_parallel is forced to 1 when delivering over an existing connection,
2633
2634If all went well and continue_more is set, we shouldn't actually get here if
2635there are further addresses, as the return above will be taken. However,
2636writing RSET might have failed, or there may be other addresses whose hosts are
2637specified in the transports, and therefore not visible at top level, in which
2638case continue_more won't get set. */
2639
f1e894f3 2640(void)close(inblock.sock);
a7538db1 2641
774ef2d7
JH
2642#ifdef EXPERIMENTAL_EVENT
2643(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH
2644#endif
2645
0756eb3c
PH
2646continue_transport = NULL;
2647continue_hostname = NULL;
2648return yield;
2649}
2650
2651
2652
2653
2654/*************************************************
2655* Closedown entry point *
2656*************************************************/
2657
2658/* This function is called when exim is passed an open smtp channel
2659from another incarnation, but the message which it has been asked
2660to deliver no longer exists. The channel is on stdin.
2661
2662We might do fancy things like looking for another message to send down
2663the channel, but if the one we sought has gone, it has probably been
2664delivered by some other process that itself will seek further messages,
2665so just close down our connection.
2666
2667Argument: pointer to the transport instance block
2668Returns: nothing
2669*/
2670
2671void
2672smtp_transport_closedown(transport_instance *tblock)
2673{
2674smtp_transport_options_block *ob =
2675 (smtp_transport_options_block *)(tblock->options_block);
2676smtp_inblock inblock;
2677smtp_outblock outblock;
2678uschar buffer[256];
2679uschar inbuffer[4096];
2680uschar outbuffer[16];
2681
2682inblock.sock = fileno(stdin);
2683inblock.buffer = inbuffer;
2684inblock.buffersize = sizeof(inbuffer);
2685inblock.ptr = inbuffer;
2686inblock.ptrend = inbuffer;
2687
2688outblock.sock = inblock.sock;
2689outblock.buffersize = sizeof(outbuffer);
2690outblock.buffer = outbuffer;
2691outblock.ptr = outbuffer;
2692outblock.cmd_count = 0;
2693outblock.authenticating = FALSE;
2694
2695(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2696(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2697 ob->command_timeout);
f1e894f3 2698(void)close(inblock.sock);
0756eb3c
PH
2699}
2700
2701
2702
2703/*************************************************
2704* Prepare addresses for delivery *
2705*************************************************/
2706
2707/* This function is called to flush out error settings from previous delivery
2708attempts to other hosts. It also records whether we got here via an MX record
2709or not in the more_errno field of the address. We are interested only in
2710addresses that are still marked DEFER - others may have got delivered to a
2711previously considered IP address. Set their status to PENDING_DEFER to indicate
2712which ones are relevant this time.
2713
2714Arguments:
2715 addrlist the list of addresses
2716 host the host we are delivering to
2717
2718Returns: the first address for this delivery
2719*/
2720
2721static address_item *
2722prepare_addresses(address_item *addrlist, host_item *host)
2723{
2724address_item *first_addr = NULL;
2725address_item *addr;
2726for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH
2727 if (addr->transport_return == DEFER)
2728 {
2729 if (first_addr == NULL) first_addr = addr;
2730 addr->transport_return = PENDING_DEFER;
2731 addr->basic_errno = 0;
2732 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2733 addr->message = NULL;
a7538db1 2734#ifdef SUPPORT_TLS
168dec3b
JH
2735 addr->cipher = NULL;
2736 addr->ourcert = NULL;
2737 addr->peercert = NULL;
2738 addr->peerdn = NULL;
2739 addr->ocsp = OCSP_NOT_REQ;
a7538db1 2740#endif
168dec3b 2741 }
0756eb3c
PH
2742return first_addr;
2743}
2744
2745
2746
2747/*************************************************
2748* Main entry point *
2749*************************************************/
2750
2751/* See local README for interface details. As this is a remote transport, it is
2752given a chain of addresses to be delivered in one connection, if possible. It
2753always returns TRUE, indicating that each address has its own independent
2754status set, except if there is a setting up problem, in which case it returns
2755FALSE. */
2756
2757BOOL
2758smtp_transport_entry(
2759 transport_instance *tblock, /* data for this instantiation */
2760 address_item *addrlist) /* addresses we are working on */
2761{
2762int cutoff_retry;
2763int port;
2764int hosts_defer = 0;
2765int hosts_fail = 0;
2766int hosts_looked_up = 0;
2767int hosts_retry = 0;
2768int hosts_serial = 0;
2769int hosts_total = 0;
8e669ac1 2770int total_hosts_tried = 0;
0756eb3c
PH
2771address_item *addr;
2772BOOL expired = TRUE;
2773BOOL continuing = continue_hostname != NULL;
2774uschar *expanded_hosts = NULL;
2775uschar *pistring;
2776uschar *tid = string_sprintf("%s transport", tblock->name);
2777smtp_transport_options_block *ob =
2778 (smtp_transport_options_block *)(tblock->options_block);
2779host_item *hostlist = addrlist->host_list;
2780host_item *host = NULL;
2781
2782DEBUG(D_transport)
2783 {
2784 debug_printf("%s transport entered\n", tblock->name);
2785 for (addr = addrlist; addr != NULL; addr = addr->next)
2786 debug_printf(" %s\n", addr->address);
2787 if (continuing) debug_printf("already connected to %s [%s]\n",
2788 continue_hostname, continue_host_address);
2789 }
2790
f6c332bd
PH
2791/* Set the flag requesting that these hosts be added to the waiting
2792database if the delivery fails temporarily or if we are running with
2793queue_smtp or a 2-stage queue run. This gets unset for certain
2794kinds of error, typically those that are specific to the message. */
2795
2796update_waiting = TRUE;
2797
0756eb3c
PH
2798/* If a host list is not defined for the addresses - they must all have the
2799same one in order to be passed to a single transport - or if the transport has
2800a host list with hosts_override set, use the host list supplied with the
2801transport. It is an error for this not to exist. */
2802
2803if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2804 {
2805 if (ob->hosts == NULL)
2806 {
2807 addrlist->message = string_sprintf("%s transport called with no hosts set",
2808 tblock->name);
2809 addrlist->transport_return = PANIC;
2810 return FALSE; /* Only top address has status */
2811 }
2812
2813 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2814 ob->hosts);
2815
2816 /* If the transport's host list contains no '$' characters, and we are not
2817 randomizing, it is fixed and therefore a chain of hosts can be built once
2818 and for all, and remembered for subsequent use by other calls to this
2819 transport. If, on the other hand, the host list does contain '$', or we are
2820 randomizing its order, we have to rebuild it each time. In the fixed case,
2821 as the hosts string will never be used again, it doesn't matter that we
2822 replace all the : characters with zeros. */
2823
2824 if (ob->hostlist == NULL)
2825 {
2826 uschar *s = ob->hosts;
2827
2828 if (Ustrchr(s, '$') != NULL)
2829 {
d427a7f9 2830 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH
2831 {
2832 addrlist->message = string_sprintf("failed to expand list of hosts "
2833 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2834 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2835 return FALSE; /* Only top address has status */
2836 }
2837 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2838 "\"%s\"\n", s, expanded_hosts);
2839 s = expanded_hosts;
2840 }
2841 else
2842 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2843
2844 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2845
e276e04b
TF
2846 /* Check that the expansion yielded something useful. */
2847 if (hostlist == NULL)
2848 {
2849 addrlist->message =
2850 string_sprintf("%s transport has empty hosts setting", tblock->name);
2851 addrlist->transport_return = PANIC;
2852 return FALSE; /* Only top address has status */
2853 }
2854
0756eb3c
PH
2855 /* If there was no expansion of hosts, save the host list for
2856 next time. */
2857
d427a7f9 2858 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH
2859 }
2860
2861 /* This is not the first time this transport has been run in this delivery;
2862 the host list was built previously. */
2863
55414b25
JH
2864 else
2865 hostlist = ob->hostlist;
0756eb3c
PH
2866 }
2867
2868/* The host list was supplied with the address. If hosts_randomize is set, we
2869must sort it into a random order if it did not come from MX records and has not
2870already been randomized (but don't bother if continuing down an existing
2871connection). */
2872
2873else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2874 {
2875 host_item *newlist = NULL;
2876 while (hostlist != NULL)
2877 {
2878 host_item *h = hostlist;
2879 hostlist = hostlist->next;
2880
2881 h->sort_key = random_number(100);
2882
2883 if (newlist == NULL)
2884 {
2885 h->next = NULL;
2886 newlist = h;
2887 }
2888 else if (h->sort_key < newlist->sort_key)
2889 {
2890 h->next = newlist;
2891 newlist = h;
2892 }
2893 else
2894 {
2895 host_item *hh = newlist;
2896 while (hh->next != NULL)
2897 {
2898 if (h->sort_key < hh->next->sort_key) break;
2899 hh = hh->next;
2900 }
2901 h->next = hh->next;
2902 hh->next = h;
2903 }
2904 }
2905
2906 hostlist = addrlist->host_list = newlist;
2907 }
2908
2d280592 2909/* Sort out the default port. */
0756eb3c
PH
2910
2911if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 2912
0756eb3c
PH
2913/* For each host-plus-IP-address on the list:
2914
2915. If this is a continued delivery and the host isn't the one with the
2916 current connection, skip.
2917
2918. If the status is unusable (i.e. previously failed or retry checked), skip.
2919
2920. If no IP address set, get the address, either by turning the name into
2921 an address, calling gethostbyname if gethostbyname is on, or by calling
2922 the DNS. The DNS may yield multiple addresses, in which case insert the
2923 extra ones into the list.
2924
2925. Get the retry data if not previously obtained for this address and set the
2926 field which remembers the state of this address. Skip if the retry time is
2927 not reached. If not, remember whether retry data was found. The retry string
2928 contains both the name and the IP address.
2929
2930. Scan the list of addresses and mark those whose status is DEFER as
2931 PENDING_DEFER. These are the only ones that will be processed in this cycle
2932 of the hosts loop.
2933
2934. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2935 Some addresses may be successfully delivered, others may fail, and yet
2936 others may get temporary errors and so get marked DEFER.
2937
2938. The return from the delivery attempt is OK if a connection was made and a
2939 valid SMTP dialogue was completed. Otherwise it is DEFER.
2940
2941. If OK, add a "remove" retry item for this host/IPaddress, if any.
2942
2943. If fail to connect, or other defer state, add a retry item.
2944
2945. If there are any addresses whose status is still DEFER, carry on to the
2946 next host/IPaddress, unless we have tried the number of hosts given
533244af 2947 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
2948 there is some fancy logic for hosts_max_try that means its limit can be
2949 overstepped in some circumstances.
0756eb3c
PH
2950
2951If we get to the end of the list, all hosts have deferred at least one address,
2952or not reached their retry times. If delay_after_cutoff is unset, it requests a
2953delivery attempt to those hosts whose last try was before the arrival time of
2954the current message. To cope with this, we have to go round the loop a second
2955time. After that, set the status and error data for any addresses that haven't
2956had it set already. */
2957
2958for (cutoff_retry = 0; expired &&
2959 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2960 cutoff_retry++)
2961 {
2962 host_item *nexthost = NULL;
2963 int unexpired_hosts_tried = 0;
2964
2965 for (host = hostlist;
8e669ac1 2966 host != NULL &&
533244af
PH
2967 unexpired_hosts_tried < ob->hosts_max_try &&
2968 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
2969 host = nexthost)
2970 {
2971 int rc;
2972 int host_af;
2973 uschar *rs;
2974 BOOL serialized = FALSE;
2975 BOOL host_is_expired = FALSE;
2976 BOOL message_defer = FALSE;
2977 BOOL ifchanges = FALSE;
2978 BOOL some_deferred = FALSE;
2979 address_item *first_addr = NULL;
2980 uschar *interface = NULL;
2981 uschar *retry_host_key = NULL;
2982 uschar *retry_message_key = NULL;
2983 uschar *serialize_key = NULL;
2984
9c4e8f60
PH
2985 /* Default next host is next host. :-) But this can vary if the
2986 hosts_max_try limit is hit (see below). It may also be reset if a host
2987 address is looked up here (in case the host was multihomed). */
2988
2989 nexthost = host->next;
2990
0756eb3c
PH
2991 /* If the address hasn't yet been obtained from the host name, look it up
2992 now, unless the host is already marked as unusable. If it is marked as
2993 unusable, it means that the router was unable to find its IP address (in
2994 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2995 the lookup failed last time. We don't get this far if *all* MX records
2996 point to non-existent hosts; that is treated as a hard error.
2997
2998 We can just skip this host entirely. When the hosts came from the router,
2999 the address will timeout based on the other host(s); when the address is
3000 looked up below, there is an explicit retry record added.
3001
3002 Note that we mustn't skip unusable hosts if the address is not unset; they
3003 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3004
3005 if (host->address == NULL)
3006 {
322050c2 3007 int new_port, flags;
7cd1141b 3008 host_item *hh;
0756eb3c
PH
3009
3010 if (host->status >= hstatus_unusable)
3011 {
3012 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3013 host->name);
3014 continue;
3015 }
3016
3017 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3018
7cd1141b
PH
3019 /* The host name is permitted to have an attached port. Find it, and
3020 strip it from the name. Just remember it for now. */
3021
3022 new_port = host_item_get_port(host);
3023
3024 /* Count hosts looked up */
3025
0756eb3c
PH
3026 hosts_looked_up++;
3027
3028 /* Find by name if so configured, or if it's an IP address. We don't
3029 just copy the IP address, because we need the test-for-local to happen. */
3030
322050c2
PH
3031 flags = HOST_FIND_BY_A;
3032 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3033 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3034
7e66e54d 3035 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3036 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3037 else
0756eb3c 3038 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
578897ea 3039 ob->dnssec_request_domains, ob->dnssec_require_domains,
55414b25 3040 NULL, NULL);
0756eb3c 3041
7cd1141b
PH
3042 /* Update the host (and any additional blocks, resulting from
3043 multihoming) with a host-specific port, if any. */
3044
3045 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3046
0756eb3c
PH
3047 /* Failure to find the host at this time (usually DNS temporary failure)
3048 is really a kind of routing failure rather than a transport failure.
3049 Therefore we add a retry item of the routing kind, not to stop us trying
3050 to look this name up here again, but to ensure the address gets timed
3051 out if the failures go on long enough. A complete failure at this point
3052 commonly points to a configuration error, but the best action is still
3053 to carry on for the next host. */
3054
3055 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3056 {
3057 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3058 expired = FALSE;
3059 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3060 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3061 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3062 host->status = hstatus_unusable;
3063
3064 for (addr = addrlist; addr != NULL; addr = addr->next)
3065 {
3066 if (addr->transport_return != DEFER) continue;
3067 addr->basic_errno = ERRNO_UNKNOWNHOST;
3068 addr->message =
3069 string_sprintf("failed to lookup IP address for %s", host->name);
3070 }
3071 continue;
3072 }
3073
3074 /* If the host is actually the local host, we may have a problem, or
3075 there may be some cunning configuration going on. In the problem case,
3076 log things and give up. The default transport status is already DEFER. */
3077
3078 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3079 {
3080 for (addr = addrlist; addr != NULL; addr = addr->next)
3081 {
3082 addr->basic_errno = 0;
3083 addr->message = string_sprintf("%s transport found host %s to be "
3084 "local", tblock->name, host->name);
3085 }
3086 goto END_TRANSPORT;
3087 }
3088 } /* End of block for IP address lookup */
3089
3090 /* If this is a continued delivery, we are interested only in the host
3091 which matches the name of the existing open channel. The check is put
3092 here after the local host lookup, in case the name gets expanded as a
3093 result of the lookup. Set expired FALSE, to save the outer loop executing
3094 twice. */
3095
3096 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3097 Ustrcmp(continue_host_address, host->address) != 0))
3098 {
3099 expired = FALSE;
3100 continue; /* With next host */
3101 }
3102
9c4e8f60
PH
3103 /* Reset the default next host in case a multihomed host whose addresses
3104 are not looked up till just above added to the host list. */
83364d30
PH
3105
3106 nexthost = host->next;
3107
0756eb3c
PH
3108 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3109 domain is in queue_smtp_domains, we don't actually want to attempt any
3110 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3111 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3112 were not in it. We don't want to hold up all SMTP deliveries! Except when
3113 doing a two-stage queue run, don't do this if forcing. */
3114
3115 if ((!deliver_force || queue_2stage) && (queue_smtp ||
55414b25
JH
3116 match_isinlist(addrlist->domain,
3117 (const uschar **)&queue_smtp_domains, 0,
cf39cf57 3118 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
3119 {
3120 expired = FALSE;
3121 for (addr = addrlist; addr != NULL; addr = addr->next)
3122 {
3123 if (addr->transport_return != DEFER) continue;
3124 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3125 }
3126 continue; /* With next host */
3127 }
3128
3129 /* Count hosts being considered - purely for an intelligent comment
3130 if none are usable. */
3131
3132 hosts_total++;
3133
3134 /* Set $host and $host address now in case they are needed for the
3135 interface expansion or the serialize_hosts check; they remain set if an
3136 actual delivery happens. */
3137
3138 deliver_host = host->name;
3139 deliver_host_address = host->address;
783b385f
JH
3140 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3141 : host->dnssec == DS_NO ? US"no"
3142 : US"";
0756eb3c 3143
7cd1141b
PH
3144 /* Set up a string for adding to the retry key if the port number is not
3145 the standard SMTP port. A host may have its own port setting that overrides
3146 the default. */
3147
3148 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3149 port : host->port);
3150 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3151
0756eb3c
PH
3152 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3153 string changes upon expansion, we must add it to the key that is used for
3154 retries, because connections to the same host from a different interface
3155 should be treated separately. */
3156
3157 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3158 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3159 &interface, tid))
3160 return FALSE;
3161 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3162
3163 /* The first time round the outer loop, check the status of the host by
3164 inspecting the retry data. The second time round, we are interested only
3165 in expired hosts that haven't been tried since this message arrived. */
3166
3167 if (cutoff_retry == 0)
3168 {
9c695f6d 3169 BOOL incl_ip;
0756eb3c 3170 /* Ensure the status of the address is set by checking retry data if
9c695f6d 3171 necessary. There may be host-specific retry data (applicable to all
0756eb3c
PH
3172 messages) and also data for retries of a specific message at this host.
3173 If either of these retry records are actually read, the keys used are
3174 returned to save recomputing them later. */
3175
9c695f6d
JH
3176 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3177 US"retry_include_ip_address", ob->retry_include_ip_address,
3178 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3179 continue; /* with next host */
3180
0756eb3c 3181 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
9c695f6d 3182 incl_ip, &retry_host_key, &retry_message_key);
0756eb3c
PH
3183
3184 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3185 (host->address == NULL)? US"" : host->address, pistring,
3186 (host->status == hstatus_usable)? "usable" :
3187 (host->status == hstatus_unusable)? "unusable" :
3188 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3189
3190 /* Skip this address if not usable at this time, noting if it wasn't
3191 actually expired, both locally and in the address. */
3192
3193 switch (host->status)
3194 {
3195 case hstatus_unusable:
3196 expired = FALSE;
3197 setflag(addrlist, af_retry_skipped);
3198 /* Fall through */
3199
3200 case hstatus_unusable_expired:
3201 switch (host->why)
3202 {
3203 case hwhy_retry: hosts_retry++; break;
3204 case hwhy_failed: hosts_fail++; break;
3205 case hwhy_deferred: hosts_defer++; break;
3206 }
3207
3208 /* If there was a retry message key, implying that previously there
3209 was a message-specific defer, we don't want to update the list of
f6c332bd 3210 messages waiting for these hosts. */
0756eb3c 3211
f6c332bd 3212 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH
3213 continue; /* With the next host or IP address */
3214 }
3215 }
3216
3217 /* Second time round the loop: if the address is set but expired, and
3218 the message is newer than the last try, let it through. */
3219
3220 else
3221 {
3222 if (host->address == NULL ||
3223 host->status != hstatus_unusable_expired ||
3224 host->last_try > received_time)
3225 continue;
3226 DEBUG(D_transport)
3227 debug_printf("trying expired host %s [%s]%s\n",
3228 host->name, host->address, pistring);
3229 host_is_expired = TRUE;
3230 }
3231
3232 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3233 it remains TRUE only if all hosts are expired and none are actually tried.
3234 */
3235
3236 expired = FALSE;
3237
3238 /* If this host is listed as one to which access must be serialized,
3239 see if another Exim process has a connection to it, and if so, skip
3240 this host. If not, update the database to record our connection to it
3241 and remember this for later deletion. Do not do any of this if we are
3242 sending the message down a pre-existing connection. */
3243
3244 if (!continuing &&
5130845b 3245 verify_check_given_host(&ob->serialize_hosts, host) == OK)
0756eb3c
PH
3246 {
3247 serialize_key = string_sprintf("host-serialize-%s", host->name);
3248 if (!enq_start(serialize_key))
3249 {
3250 DEBUG(D_transport)
3251 debug_printf("skipping host %s because another Exim process "
3252 "is connected to it\n", host->name);
3253 hosts_serial++;
3254 continue;
3255 }
3256 serialized = TRUE;
3257 }
3258
3259 /* OK, we have an IP address that is not waiting for its retry time to
3260 arrive (it might be expired) OR (second time round the loop) we have an
3261 expired host that hasn't been tried since the message arrived. Have a go
3262 at delivering the message to it. First prepare the addresses by flushing
3263 out the result of previous attempts, and finding the first address that
3264 is still to be delivered. */
3265
3266 first_addr = prepare_addresses(addrlist, host);
3267
3268 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3269 message_id, host->name, host->address, addrlist->address,
3270 (addrlist->next == NULL)? "" : ", ...");
3271
3272 set_process_info("delivering %s to %s [%s] (%s%s)",
3273 message_id, host->name, host->address, addrlist->address,
3274 (addrlist->next == NULL)? "" : ", ...");
3275
3276 /* This is not for real; don't do the delivery. If there are
3277 any remaining hosts, list them. */
3278
3279 if (dont_deliver)
3280 {
3281 host_item *host2;
c562fd30 3282 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
0756eb3c
PH
3283 for (addr = addrlist; addr != NULL; addr = addr->next)
3284 {
3285 addr->host_used = host;
3286 addr->special_action = '*';
3287 addr->message = US"delivery bypassed by -N option";
3288 }
3289 DEBUG(D_transport)
3290 {
3291 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3292 "*** host and remaining hosts:\n", tblock->name);
3293 for (host2 = host; host2 != NULL; host2 = host2->next)
3294 debug_printf(" %s [%s]\n", host2->name,
3295 (host2->address == NULL)? US"unset" : host2->address);
3296 }
3297 rc = OK;
3298 }
3299
3300 /* This is for real. If the host is expired, we don't count it for
3301 hosts_max_retry. This ensures that all hosts must expire before an address
8e669ac1 3302 is timed out, unless hosts_max_try_hardlimit (which protects against
533244af 3303 lunatic DNS configurations) is reached.
8e669ac1 3304
533244af
PH
3305 If the host is not expired and we are about to hit the hosts_max_retry
3306 limit, check to see if there is a subsequent hosts with a different MX
3307 value. If so, make that the next host, and don't count this one. This is a
3308 heuristic to make sure that different MXs do get tried. With a normal kind
3309 of retry rule, they would get tried anyway when the earlier hosts were
3310 delayed, but if the domain has a "retry every time" type of rule - as is
3311 often used for the the very large ISPs, that won't happen. */
0756eb3c
PH
3312
3313 else
3314 {
d427a7f9
JH
3315 host_item * thost;
3316 /* Make a copy of the host if it is local to this invocation
3317 of the transport. */
3318
3319 if (expanded_hosts)
3320 {
3321 thost = store_get(sizeof(host_item));
3322 *thost = *host;
3323 thost->name = string_copy(host->name);
3324 thost->address = string_copy(host->address);
3325 }
3326 else
3327 thost = host;
3328
0756eb3c
PH
3329 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3330 {
3331 host_item *h;
3332 DEBUG(D_transport)
3333 debug_printf("hosts_max_try limit reached with this host\n");
3334 for (h = host; h != NULL; h = h->next)
3335 if (h->mx != host->mx) break;
3336 if (h != NULL)
3337 {
3338 nexthost = h;
3339 unexpired_hosts_tried--;
3340 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3341 "and will be tried\n");
3342 }
3343 }
3344
3345 /* Attempt the delivery. */
3346
533244af 3347 total_hosts_tried++;
d427a7f9
JH
3348 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3349 &message_defer, FALSE);
0756eb3c
PH
3350
3351 /* Yield is one of:
3352 OK => connection made, each address contains its result;
3353 message_defer is set for message-specific defers (when all
3354 recipients are marked defer)
3355 DEFER => there was a non-message-specific delivery problem;
3356 ERROR => there was a problem setting up the arguments for a filter,
3357 or there was a problem with expanding added headers
3358 */
3359
3360 /* If the result is not OK, there was a non-message-specific problem.
3361 If the result is DEFER, we need to write to the logs saying what happened
3362 for this particular host, except in the case of authentication and TLS
3363 failures, where the log has already been written. If all hosts defer a
3364 general message is written at the end. */
3365
3366 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3367 first_addr->basic_errno != ERRNO_TLSFAILURE)
3368 write_logs(first_addr, host);
3369
774ef2d7 3370#ifdef EXPERIMENTAL_EVENT
d68218c7 3371 if (rc == DEFER)
774ef2d7 3372 deferred_event_raise(first_addr, host);
a7538db1 3373#endif
d68218c7 3374
0756eb3c
PH
3375 /* If STARTTLS was accepted, but there was a failure in setting up the
3376 TLS session (usually a certificate screwup), and the host is not in
3377 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3378 TLS forcibly turned off. We have to start from scratch with a new SMTP
3379 connection. That's why the retry is done from here, not from within
3380 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3381 session, so the in-clear transmission after those errors, if permitted,
3382 happens inside smtp_deliver().] */
3383
a7538db1 3384#ifdef SUPPORT_TLS
7a31d643
JH
3385 if ( rc == DEFER
3386 && first_addr->basic_errno == ERRNO_TLSFAILURE
3387 && ob->tls_tempfail_tryclear
5130845b 3388 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
7a31d643 3389 )
0756eb3c
PH
3390 {
3391 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3392 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3393 first_addr = prepare_addresses(addrlist, host);
d427a7f9
JH
3394 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3395 &message_defer, TRUE);
0756eb3c
PH
3396 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3397 write_logs(first_addr, host);
774ef2d7 3398# ifdef EXPERIMENTAL_EVENT
d68218c7 3399 if (rc == DEFER)
774ef2d7 3400 deferred_event_raise(first_addr, host);
a7538db1 3401# endif
0756eb3c 3402 }
a1bccd48 3403#endif /*SUPPORT_TLS*/
0756eb3c
PH
3404 }
3405
3406 /* Delivery attempt finished */
3407
3408 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3409 US"ERROR" : US"?";
3410
3411 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3412 message_id, host->name, host->address, addrlist->address,
3413 (addrlist->next == NULL)? "" : " (& others)", rs);
3414
3415 /* Release serialization if set up */
3416
3417 if (serialized) enq_end(serialize_key);
3418
3419 /* If the result is DEFER, or if a host retry record is known to exist, we
3420 need to add an item to the retry chain for updating the retry database
3421 at the end of delivery. We only need to add the item to the top address,
3422 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3423 for any other delivery attempts using the same address. (It is copied into
3424 the unusable tree at the outer level, so even if different address blocks
3425 contain the same address, it still won't get tried again.) */
3426
3427 if (rc == DEFER || retry_host_key != NULL)
3428 {
3429 int delete_flag = (rc != DEFER)? rf_delete : 0;
3430 if (retry_host_key == NULL)
3431 {
9c695f6d
JH
3432 BOOL incl_ip;
3433 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3434 US"retry_include_ip_address", ob->retry_include_ip_address,
3435 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3436 incl_ip = TRUE; /* error; use most-specific retry record */
3437
3438 retry_host_key = incl_ip ?
0756eb3c
PH
3439 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3440 string_sprintf("T:%S%s", host->name, pistring);
3441 }
3442
3443 /* If a delivery of another message over an existing SMTP connection
3444 yields DEFER, we do NOT set up retry data for the host. This covers the
3445 case when there are delays in routing the addresses in the second message
3446 that are so long that the server times out. This is alleviated by not
3447 routing addresses that previously had routing defers when handling an
3448 existing connection, but even so, this case may occur (e.g. if a
3449 previously happily routed address starts giving routing defers). If the
3450 host is genuinely down, another non-continued message delivery will
3451 notice it soon enough. */
3452
3453 if (delete_flag != 0 || !continuing)
3454 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3455
3456 /* We may have tried an expired host, if its retry time has come; ensure
3457 the status reflects the expiry for the benefit of any other addresses. */
3458
3459 if (rc == DEFER)
3460 {
3461 host->status = (host_is_expired)?
3462 hstatus_unusable_expired : hstatus_unusable;
3463 host->why = hwhy_deferred;
3464 }
3465 }
3466
3467 /* If message_defer is set (host was OK, but every recipient got deferred
3468 because of some message-specific problem), or if that had happened
3469 previously so that a message retry key exists, add an appropriate item
3470 to the retry chain. Note that if there was a message defer but now there is
3471 a host defer, the message defer record gets deleted. That seems perfectly
3472 reasonable. Also, stop the message from being remembered as waiting
f6c332bd 3473 for specific hosts. */
0756eb3c
PH
3474
3475 if (message_defer || retry_message_key != NULL)
3476 {
3477 int delete_flag = message_defer? 0 : rf_delete;
3478 if (retry_message_key == NULL)
3479 {
9c695f6d
JH
3480 BOOL incl_ip;
3481 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3482 US"retry_include_ip_address", ob->retry_include_ip_address,
3483 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3484 incl_ip = TRUE; /* error; use most-specific retry record */
3485
3486 retry_message_key = incl_ip ?
0756eb3c
PH
3487 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3488 message_id) :
3489 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3490 }
3491 retry_add_item(addrlist, retry_message_key,
3492 rf_message | rf_host | delete_flag);
f6c332bd 3493 update_waiting = FALSE;
0756eb3c
PH
3494 }
3495
3496 /* Any return other than DEFER (that is, OK or ERROR) means that the
3497 addresses have got their final statuses filled in for this host. In the OK
3498 case, see if any of them are deferred. */
3499
3500 if (rc == OK)
3501 {
3502 for (addr = addrlist; addr != NULL; addr = addr->next)
3503 {
3504 if (addr->transport_return == DEFER)
3505 {
3506 some_deferred = TRUE;
3507 break;
3508 }
3509 }