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Events: add recipient-deferred events, both per-host and all-hosts.
[exim.git] / src / src / transports / smtp.c
CommitLineData
0756eb3c
PH		 1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
3386088d 5/* Copyright (c) University of Cambridge 1995 - 2015 */
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 63 { "dnssec_request_domains", opt_stringptr,
7cd171b7 64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 65 { "dnssec_require_domains", opt_stringptr,
7cd171b7 66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
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 */
f5d78688 220#endif
f2de3a33 221#ifndef DISABLE_OCSP
0e66b3b6 222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
f5d78688 223 NULL, /* hosts_require_ocsp */
fd98a5c6 224#endif
0756eb3c
PH		 225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
6c9ed72e 227 NULL, /* 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 */
0539a19d 244 { NULL, NULL }, /* dnssec_domains {request,require} */
0756eb3c
PH		 245 TRUE, /* delay_after_cutoff */
246 FALSE, /* hosts_override */
247 FALSE, /* hosts_randomize */
248 TRUE, /* keepalive */
f1513293 249 FALSE, /* lmtp_ignore_quota */
9c695f6d 250 NULL, /* expand_retry_include_ip_address */
0756eb3c 251 TRUE /* retry_include_ip_address */
7eb6c37c 252#ifdef EXPERIMENTAL_SOCKS
7eb6c37c 253 ,NULL /* socks_proxy */
b8bf753b 254#endif
80a47a2c 255#ifdef SUPPORT_TLS
0756eb3c
PH		 256 ,NULL, /* tls_certificate */
257 NULL, /* tls_crl */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
83da1223
PH		 260 NULL, /* gnutls_require_kx */
261 NULL, /* gnutls_require_mac */
262 NULL, /* gnutls_require_proto */
54c90be1 263 NULL, /* tls_sni */
0e0f3f56 264 US"system", /* tls_verify_certificates */
54c90be1
PP		 265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
a63be306
WB		 267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
610ff438 269 US"*", /* tls_try_verify_hosts */
01a4a5c5 270 US"*" /* tls_verify_cert_hostnames */
80a47a2c
TK		 271#endif
272#ifndef DISABLE_DKIM
f7572e5a
TK		 273 ,NULL, /* dkim_canon */
274 NULL, /* dkim_domain */
275 NULL, /* dkim_private_key */
276 NULL, /* dkim_selector */
277 NULL, /* dkim_sign_headers */
278 NULL /* dkim_strict */
80a47a2c 279#endif
0756eb3c
PH		 280};
281
6c1c3d1d
WB		 282/* some DSN flags for use later */
283
284static int rf_list[] = {rf_notify_never, rf_notify_success,
285 rf_notify_failure, rf_notify_delay };
286
45500060 287static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
6c1c3d1d
WB		 288
289
0756eb3c
PH		 290
291/* Local statics */
292
293static uschar *smtp_command; /* Points to last cmd for error messages */
294static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 295static BOOL update_waiting; /* TRUE to update the "wait" database */
0756eb3c
PH		 296
297
298/*************************************************
299* Setup entry point *
300*************************************************/
301
302/* This function is called when the transport is about to be used,
303but before running it in a sub-process. It is used for two things:
304
305 (1) To set the fallback host list in addresses, when delivering.
26da7e20
PH		 306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
0756eb3c
PH		 308
309Arguments:
310 tblock pointer to the transport instance block
311 addrlist list of addresses about to be transported
312 tf if not NULL, pointer to block in which to return options
929ba01c
PH		 313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
0756eb3c
PH		 315 errmsg place for error message (not used)
316
317Returns: OK always (FAIL, DEFER not used)
318*/
319
320static int
321smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 322 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c
PH		 323{
324smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
326
327errmsg = errmsg; /* Keep picky compilers happy */
929ba01c
PH		 328uid = uid;
329gid = gid;
0756eb3c
PH		 330
331/* Pass back options if required. This interface is getting very messy. */
332
333if (tf != NULL)
334 {
335 tf->interface = ob->interface;
336 tf->port = ob->port;
337 tf->protocol = ob->protocol;
338 tf->hosts = ob->hosts;
339 tf->hosts_override = ob->hosts_override;
340 tf->hosts_randomize = ob->hosts_randomize;
341 tf->gethostbyname = ob->gethostbyname;
342 tf->qualify_single = ob->dns_qualify_single;
343 tf->search_parents = ob->dns_search_parents;
26da7e20 344 tf->helo_data = ob->helo_data;
0756eb3c
PH		 345 }
346
347/* Set the fallback host list for all the addresses that don't have fallback
348host lists, provided that the local host wasn't present in the original host
349list. */
350
351if (!testflag(addrlist, af_local_host_removed))
352 {
353 for (; addrlist != NULL; addrlist = addrlist->next)
354 if (addrlist->fallback_hosts == NULL)
355 addrlist->fallback_hosts = ob->fallback_hostlist;
356 }
357
358return OK;
359}
360
361
362
363/*************************************************
364* Initialization entry point *
365*************************************************/
366
367/* Called for each instance, after its options have been read, to
368enable consistency checks to be done, or anything else that needs
369to be set up.
370
371Argument: pointer to the transport instance block
372Returns: nothing
373*/
374
375void
376smtp_transport_init(transport_instance *tblock)
377{
378smtp_transport_options_block *ob =
379 (smtp_transport_options_block *)(tblock->options_block);
380
381/* Retry_use_local_part defaults FALSE if unset */
382
383if (tblock->retry_use_local_part == TRUE_UNSET)
384 tblock->retry_use_local_part = FALSE;
385
386/* Set the default port according to the protocol */
387
388if (ob->port == NULL)
061b7ebd
PP		 389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
0756eb3c
PH		 391
392/* Set up the setup entry point, to be called before subprocesses for this
393transport. */
394
395tblock->setup = smtp_transport_setup;
396
397/* Complain if any of the timeouts are zero. */
398
399if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
400 ob->final_timeout <= 0)
401 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
402 "command, data, or final timeout value is zero for %s transport",
403 tblock->name);
404
405/* If hosts_override is set and there are local hosts, set the global
406flag that stops verify from showing router hosts. */
407
408if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
409
410/* If there are any fallback hosts listed, build a chain of host items
411for them, but do not do any lookups at this time. */
412
413host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
2d571266 414
32d07012 415#ifdef SUPPORT_TLS
2d571266
JH		 416if ( ob->gnutls_require_kx
417 || ob->gnutls_require_mac
418 || ob->gnutls_require_proto)
419 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
420 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
421 " are obsolete\n");
32d07012 422#endif
0756eb3c
PH		 423}
424
425
426
427
428
429/*************************************************
430* Set delivery info into all active addresses *
431*************************************************/
432
433/* Only addresses whose status is >= PENDING are relevant. A lesser
434status means that an address is not currently being processed.
435
436Arguments:
447d236c
PH		 437 addrlist points to a chain of addresses
438 errno_value to put in each address's errno field
439 msg to put in each address's message field
440 rc to put in each address's transport_return field
441 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 442 host if set, mark addrs as having used this host
895fbaf2
JH		 443 smtp_greeting from peer
444 helo_response from peer
0756eb3c
PH		 445
446If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448this particular type of timeout.
449
450Returns: nothing
451*/
452
7cd1141b
PH		 453static void
454set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
895fbaf2
JH		 455 BOOL pass_message, host_item * host
456#ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
458#endif
459 )
0756eb3c
PH		 460{
461address_item *addr;
462int orvalue = 0;
463if (errno_value == ERRNO_CONNECTTIMEOUT)
464 {
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
467 }
895fbaf2 468for (addr = addrlist; addr; addr = addr->next)
168dec3b 469 if (addr->transport_return >= PENDING)
447d236c 470 {
168dec3b
JH		 471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
473 if (msg != NULL)
474 {
475 addr->message = msg;
476 if (pass_message) setflag(addr, af_pass_message);
477 }
478 addr->transport_return = rc;
479 if (host)
895fbaf2 480 {
168dec3b 481 addr->host_used = host;
895fbaf2
JH		 482#ifdef EXPERIMENTAL_DSN_INFO
483 if (smtp_greeting)
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
486
487 if (helo_response)
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
490#endif
491 }
447d236c 492 }
0756eb3c
PH		 493}
494
895fbaf2
JH		 495static void
496set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
497 BOOL pass_message)
498{
499set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500#ifdef EXPERIMENTAL_DSN_INFO
501 , NULL, NULL
502#endif
503 );
504}
0756eb3c
PH		 505
506
507/*************************************************
508* Check an SMTP response *
509*************************************************/
510
511/* This function is given an errno code and the SMTP response buffer
512to analyse, together with the host identification for generating messages. It
513sets an appropriate message and puts the first digit of the response code into
514the yield variable. If no response was actually read, a suitable digit is
515chosen.
516
517Arguments:
447d236c
PH		 518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
525
526Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH		 527*/
528
a7538db1
JH		 529static BOOL
530check_response(host_item *host, int *errno_value, int more_errno,
447d236c 531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c
PH		 532{
533uschar *pl = US"";
534
535if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
539 pl = US"pipelined ";
540
541*yield = '4'; /* Default setting is to give a temporary error */
542
543/* Handle response timeout */
544
545if (*errno_value == ETIMEDOUT)
546 {
c562fd30
JH		 547 *message = US string_sprintf("SMTP timeout after %s%s",
548 pl, smtp_command);
0756eb3c
PH		 549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
551 transport_count);
552 return FALSE;
553 }
554
555/* Handle malformed SMTP response */
556
557if (*errno_value == ERRNO_SMTPFORMAT)
558 {
55414b25 559 const uschar *malfresp = string_printing(buffer);
0756eb3c 560 while (isspace(*malfresp)) malfresp++;
c562fd30
JH		 561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
0756eb3c
PH		 566 return FALSE;
567 }
568
569/* Handle a failed filter process error; can't send QUIT as we mustn't
570end the DATA. */
571
572if (*errno_value == ERRNO_FILTER_FAIL)
573 {
35af9f61 574 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 575 more_errno,
35af9f61 576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH		 577 return FALSE;
578 }
579
580/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
581end the DATA. */
582
583if (*errno_value == ERRNO_CHHEADER_FAIL)
584 {
585 *message =
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
588 return FALSE;
589 }
590
591/* Handle failure to write a complete data block */
592
593if (*errno_value == ERRNO_WRITEINCOMPLETE)
594 {
595 *message = US string_sprintf("failed to write a data block");
596 return FALSE;
597 }
598
250b6871
JH		 599#ifdef EXPERIMENTAL_INTERNATIONAL
600/* Handle lack of advertised SMTPUTF8, for international message */
601if (*errno_value == ERRNO_UTF8_FWD)
602 {
f358d5e0 603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
250b6871
JH		 604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
605 return TRUE;
606 }
607#endif
608
0756eb3c
PH		 609/* Handle error responses from the remote mailer. */
610
611if (buffer[0] != 0)
612 {
55414b25 613 const uschar *s = string_printing(buffer);
447d236c 614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 615 "%s", pl, smtp_command, s);
447d236c 616 *pass_message = TRUE;
0756eb3c
PH		 617 *yield = buffer[0];
618 return TRUE;
619 }
620
621/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH		 622connection closed) case, which causes deferral. An explicit connection reset
623error has the same effect. Otherwise, put the host's identity in the message,
624leaving the errno value to be interpreted as well. In all cases, we have to
625assume the connection is now dead. */
0756eb3c 626
19b9dc85 627if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH		 628 {
629 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH		 630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
0756eb3c
PH		 632 }
633else *message = US string_sprintf("%s [%s]", host->name, host->address);
634
635return FALSE;
636}
637
638
639
640/*************************************************
641* Write error message to logs *
642*************************************************/
643
644/* This writes to the main log and to the message log.
645
646Arguments:
647 addr the address item containing error information
648 host the current host
649
650Returns: nothing
651*/
652
653static void
654write_logs(address_item *addr, host_item *host)
655{
c562fd30
JH		 656uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
657
1a47b633
JH		 658if (LOGGING(outgoing_port))
659 message = string_sprintf("%s:%d", message,
660 host->port == PORT_NONE ? 25 : host->port);
c562fd30 661if (addr->message)
0756eb3c 662 {
c562fd30 663 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH		 664 if (addr->basic_errno > 0)
665 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
666 log_write(0, LOG_MAIN, "%s", message);
667 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
668 }
669else
670 {
c562fd30
JH		 671 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
672 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
673 strerror(addr->basic_errno));
0756eb3c
PH		 674 }
675}
676
c562fd30
JH		 677static void
678msglog_line(host_item * host, uschar * message)
679{
680 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
681 host->name, host->address, message);
682}
683
0756eb3c
PH		 684
685
774ef2d7 686#ifdef EXPERIMENTAL_EVENT
d68218c7
JH		 687/*************************************************
688* Post-defer action *
689*************************************************/
690
691/* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
693
694Arguments:
d68218c7
JH		 695 addr the address item containing error information
696 host the current host
697
698Returns: nothing
699*/
700
701static void
774ef2d7 702deferred_event_raise(address_item *addr, host_item *host)
d68218c7 703{
774ef2d7 704uschar * action = addr->transport->event_action;
55414b25 705const uschar * save_domain;
a7538db1
JH		 706uschar * save_local;
707
d68218c7 708if (!action)
a7538db1 709 return;
d68218c7 710
a7538db1
JH		 711save_domain = deliver_domain;
712save_local = deliver_localpart;
713
714/*XXX would ip & port already be set up? */
715deliver_host_address = string_copy(host->address);
774ef2d7
JH		 716deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717event_defer_errno = addr->basic_errno;
d68218c7
JH		 718
719router_name = addr->router->name;
720transport_name = addr->transport->name;
a7538db1
JH		 721deliver_domain = addr->domain;
722deliver_localpart = addr->local_part;
723
774ef2d7 724(void) event_raise(action, US"msg:host:defer",
a7538db1
JH		 725 addr->message
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
731 : NULL);
732
733deliver_localpart = save_local;
734deliver_domain = save_domain;
d68218c7
JH		 735router_name = transport_name = NULL;
736}
737#endif
738
0756eb3c
PH		 739/*************************************************
740* Synchronize SMTP responses *
741*************************************************/
742
743/* This function is called from smtp_deliver() to receive SMTP responses from
744the server, and match them up with the commands to which they relate. When
745PIPELINING is not in use, this function is called after every command, and is
746therefore somewhat over-engineered, but it is simpler to use a single scheme
747that works both with and without PIPELINING instead of having two separate sets
748of code.
749
750The set of commands that are buffered up with pipelining may start with MAIL
751and may end with DATA; in between are RCPT commands that correspond to the
752addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753etc.) are never buffered.
754
755Errors after MAIL or DATA abort the whole process leaving the response in the
756buffer. After MAIL, pending responses are flushed, and the original command is
757re-instated in big_buffer for error messages. For RCPT commands, the remote is
758permitted to reject some recipient addresses while accepting others. However
759certain errors clearly abort the whole process. Set the value in
760transport_return to PENDING_OK if the address is accepted. If there is a
761subsequent general error, it will get reset accordingly. If not, it will get
762converted to OK at the end.
763
764Arguments:
48c7f9e2
PH		 765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
770 address_retry_
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
0756eb3c
PH		 780
781Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
788*/
789
790static int
791sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH		 792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH		 794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
795 int buffsize)
796{
797address_item *addr = *sync_addr;
798int yield = 0;
799
800/* Handle the response for a MAIL command. On error, reinstate the original
801command in big_buffer for error message use, and flush any further pending
802responses before returning, except after I/O errors and timeouts. */
803
804if (pending_MAIL)
805 {
806 count--;
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
808 {
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
811 {
812 uschar flushbuffer[4096];
e97957bc
PH		 813 int save_errno = 0;
814 if (buffer[0] == '4')
815 {
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
818 }
0756eb3c
PH		 819 while (count-- > 0)
820 {
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
822 '2', timeout)
823 && (errno != 0 || flushbuffer[0] == 0))
824 break;
825 }
e97957bc 826 errno = save_errno;
0756eb3c 827 }
c562fd30
JH		 828
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
831 {
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
834 addr = addr->next;
835 }
0756eb3c
PH		 836 return -3;
837 }
838 }
839
840if (pending_DATA) count--; /* Number of RCPT responses to come */
841
842/* Read and handle the required number of RCPT responses, matching each one up
843with an address by scanning for the next address whose status is PENDING_DEFER.
844*/
845
846while (count-- > 0)
847 {
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
849
850 /* The address was accepted */
c562fd30 851 addr->host_used = host;
0756eb3c
PH		 852
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
854 {
855 yield |= 1;
856 addr->transport_return = PENDING_OK;
857
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH		 859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
0756eb3c
PH		 861
862 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH		 863 {
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
865 sender_address);
866 retry_add_item(addr, altkey, rf_delete);
0756eb3c 867 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 868 }
0756eb3c
PH		 869 }
870
871 /* Timeout while reading the response */
872
873 else if (errno == ETIMEDOUT)
874 {
c562fd30
JH		 875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
895fbaf2 877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 878 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 879 update_waiting = FALSE;
0756eb3c
PH		 880 return -1;
881 }
882
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
886 makes sense. */
887
888 else if (errno != 0 || buffer[0] == 0)
889 {
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
892 return -2;
893 }
894
895 /* Handle SMTP permanent and temporary response codes. */
896
897 else
898 {
899 addr->message =
447d236c 900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH		 901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
447d236c 903 setflag(addr, af_pass_message);
c562fd30 904 msglog_line(host, addr->message);
0756eb3c
PH		 905
906 /* The response was 5xx */
907
908 if (buffer[0] == '5')
909 {
910 addr->transport_return = FAIL;
911 yield |= 2;
912 }
913
914 /* The response was 4xx */
915
916 else
917 {
0756eb3c
PH		 918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 921
5ef5dd52
JB		 922#ifdef EXPERIMENTAL_EVENT
923 event_defer_errno = addr->more_errno;
924 msg_event_raise(US"msg:rcpt:host:defer", addr);
925#endif
926
c562fd30
JH		 927 /* Log temporary errors if there are more hosts to be tried.
928 If not, log this last one in the == line. */
0756eb3c 929
c562fd30
JH		 930 if (host->next)
931 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 932
5ef5dd52
JB		 933#ifdef EXPERIMENTAL_EVENT
934 else
935 msg_event_raise(US"msg:rcpt:defer", addr);
936#endif
937
f6c332bd
PH		 938 /* Do not put this message on the list of those waiting for specific
939 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 940
f6c332bd 941 update_waiting = FALSE;
0756eb3c 942
48c7f9e2
PH		 943 /* Add a retry item for the address so that it doesn't get tried again
944 too soon. If address_retry_include_sender is true, add the sender address
945 to the retry key. */
0756eb3c 946
48c7f9e2
PH		 947 if (address_retry_include_sender)
948 {
949 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
950 sender_address);
951 retry_add_item(addr, altkey, 0);
952 }
953 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH		 954 }
955 }
956 } /* Loop for next RCPT response */
957
958/* Update where to start at for the next block of responses, unless we
959have already handled all the addresses. */
960
961if (addr != NULL) *sync_addr = addr->next;
962
963/* Handle a response to DATA. If we have not had any good recipients, either
964previously or in this block, the response is ignored. */
965
966if (pending_DATA != 0 &&
967 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
968 {
969 int code;
970 uschar *msg;
447d236c 971 BOOL pass_message;
e97957bc
PH		 972 if (pending_DATA > 0 || (yield & 1) != 0)
973 {
974 if (errno == 0 && buffer[0] == '4')
975 {
976 errno = ERRNO_DATA4XX;
977 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
978 }
979 return -3;
980 }
447d236c 981 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH		 982 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
983 "is in use and there were no good recipients\n", msg);
984 }
985
986/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
987present) received 3xx. If any RCPTs were handled and yielded anything other
988than 4xx, yield will be set non-zero. */
989
990return yield;
991}
992
993
994
fcc8e047
JH		 995/* Do the client side of smtp-level authentication */
996/*
997Arguments:
998 buffer EHLO response from server (gets overwritten)
999 addrlist chain of potential addresses to deliver
1000 host host to deliver to
1001 ob transport options
1002 ibp, obp comms channel control blocks
1003
1004Returns:
1005 OK Success, or failed (but not required): global "smtp_authenticated" set
1006 DEFER Failed authentication (and was required)
1007 ERROR Internal problem
1008
1009 FAIL_SEND Failed communications - transmit
1010 FAIL - response
1011*/
1012
1013int
1014smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1015 smtp_transport_options_block *ob, BOOL is_esmtp,
1016 smtp_inblock *ibp, smtp_outblock *obp)
1017{
a7538db1
JH		 1018int require_auth;
1019uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 1020
a7538db1
JH		 1021smtp_authenticated = FALSE;
1022client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 1023require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 1024
a7538db1
JH		 1025if (is_esmtp && !regex_AUTH) regex_AUTH =
1026 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1027 FALSE, TRUE);
fcc8e047 1028
a7538db1
JH		 1029if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1030 {
1031 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1032 expand_nmax = -1; /* reset */
fcc8e047 1033
a7538db1
JH		 1034 /* Must not do this check until after we have saved the result of the
1035 regex match above. */
fcc8e047 1036
a7538db1 1037 if (require_auth == OK ||
5130845b 1038 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH		 1039 {
1040 auth_instance *au;
1041 fail_reason = US"no common mechanisms were found";
fcc8e047 1042
a7538db1 1043 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1044
a7538db1
JH		 1045 /* Scan the configured authenticators looking for one which is configured
1046 for use as a client, which is not suppressed by client_condition, and
1047 whose name matches an authentication mechanism supported by the server.
1048 If one is found, attempt to authenticate by calling its client function.
1049 */
fcc8e047 1050
a7538db1
JH		 1051 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1052 {
1053 uschar *p = names;
1054 if (!au->client ||
1055 (au->client_condition != NULL &&
1056 !expand_check_condition(au->client_condition, au->name,
1057 US"client authenticator")))
1058 {
1059 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1060 au->name,
1061 (au->client)? "client_condition is false" :
1062 "not configured as a client");
1063 continue;
1064 }
fcc8e047 1065
a7538db1 1066 /* Loop to scan supported server mechanisms */
fcc8e047 1067
a7538db1
JH		 1068 while (*p != 0)
1069 {
1070 int rc;
1071 int len = Ustrlen(au->public_name);
1072 while (isspace(*p)) p++;
fcc8e047 1073
a7538db1
JH		 1074 if (strncmpic(au->public_name, p, len) != 0 ||
1075 (p[len] != 0 && !isspace(p[len])))
1076 {
1077 while (*p != 0 && !isspace(*p)) p++;
1078 continue;
1079 }
fcc8e047 1080
a7538db1
JH		 1081 /* Found data for a listed mechanism. Call its client entry. Set
1082 a flag in the outblock so that data is overwritten after sending so
1083 that reflections don't show it. */
fcc8e047 1084
a7538db1
JH		 1085 fail_reason = US"authentication attempt(s) failed";
1086 obp->authenticating = TRUE;
1087 rc = (au->info->clientcode)(au, ibp, obp,
1088 ob->command_timeout, buffer, bufsize);
1089 obp->authenticating = FALSE;
1090 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1091 au->name, rc);
fcc8e047 1092
a7538db1
JH		 1093 /* A temporary authentication failure must hold up delivery to
1094 this host. After a permanent authentication failure, we carry on
1095 to try other authentication methods. If all fail hard, try to
1096 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1097
a7538db1
JH		 1098 switch(rc)
1099 {
1100 case OK:
1101 smtp_authenticated = TRUE; /* stops the outer loop */
1102 client_authenticator = au->name;
1103 if (au->set_client_id != NULL)
1104 client_authenticated_id = expand_string(au->set_client_id);
1105 break;
1106
1107 /* Failure after writing a command */
1108
1109 case FAIL_SEND:
1110 return FAIL_SEND;
1111
1112 /* Failure after reading a response */
1113
1114 case FAIL:
1115 if (errno != 0 || buffer[0] != '5') return FAIL;
1116 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1117 au->name, host->name, host->address, buffer);
1118 break;
1119
1120 /* Failure by some other means. In effect, the authenticator
1121 decided it wasn't prepared to handle this case. Typically this
1122 is the result of "fail" in an expansion string. Do we need to
1123 log anything here? Feb 2006: a message is now put in the buffer
1124 if logging is required. */
1125
1126 case CANCELLED:
1127 if (*buffer != 0)
1128 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1129 "authentication H=%s [%s] %s", au->name, host->name,
1130 host->address, buffer);
1131 break;
1132
1133 /* Internal problem, message in buffer. */
1134
1135 case ERROR:
895fbaf2
JH		 1136 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1137 DEFER, FALSE);
a7538db1
JH		 1138 return ERROR;
1139 }
fcc8e047 1140
a7538db1
JH		 1141 break; /* If not authenticated, try next authenticator */
1142 } /* Loop for scanning supported server mechanisms */
1143 } /* Loop for further authenticators */
fcc8e047 1144 }
a7538db1 1145 }
fcc8e047 1146
a7538db1 1147/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1148
a7538db1
JH		 1149if (require_auth == OK && !smtp_authenticated)
1150 {
895fbaf2 1151 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1152 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1153 FALSE);
a7538db1
JH		 1154 return DEFER;
1155 }
4d8d62b9 1156
a7538db1 1157return OK;
fcc8e047
JH		 1158}
1159
1160
1161/* Construct AUTH appendix string for MAIL TO */
1162/*
1163Arguments
1164 buffer to build string
1165 addrlist chain of potential addresses to deliver
1166 ob transport options
1167
1168Globals smtp_authenticated
1169 client_authenticated_sender
1170Return True on error, otherwise buffer has (possibly empty) terminated string
1171*/
1172
1173BOOL
1174smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1175 smtp_transport_options_block *ob)
1176{
1177uschar *local_authenticated_sender = authenticated_sender;
1178
1179#ifdef notdef
1180 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1181#endif
1182
1183if (ob->authenticated_sender != NULL)
1184 {
1185 uschar *new = expand_string(ob->authenticated_sender);
1186 if (new == NULL)
1187 {
1188 if (!expand_string_forcedfail)
1189 {
1190 uschar *message = string_sprintf("failed to expand "
1191 "authenticated_sender: %s", expand_string_message);
895fbaf2 1192 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH		 1193 return TRUE;
1194 }
1195 }
1196 else if (new[0] != 0) local_authenticated_sender = new;
1197 }
1198
1199/* Add the authenticated sender address if present */
1200
1201if ((smtp_authenticated || ob->authenticated_sender_force) &&
1202 local_authenticated_sender != NULL)
1203 {
1204 string_format(buffer, bufsize, " AUTH=%s",
1205 auth_xtextencode(local_authenticated_sender,
1206 Ustrlen(local_authenticated_sender)));
1207 client_authenticated_sender = string_copy(local_authenticated_sender);
1208 }
1209else
1210 *buffer= 0;
1211
1212return FALSE;
1213}
1214
1215
1216
0e66b3b6
JH		 1217#ifdef EXPERIMENTAL_DANE
1218int
b8b1b5cb 1219tlsa_lookup(const host_item * host, dns_answer * dnsa,
0e66b3b6
JH		 1220 BOOL dane_required, BOOL * dane)
1221{
1222/* move this out to host.c given the similarity to dns_lookup() ? */
1223uschar buffer[300];
55414b25 1224const uschar * fullname = buffer;
0e66b3b6
JH		 1225
1226/* TLSA lookup string */
1227(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1228
1229switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1230 {
1231 case DNS_AGAIN:
1232 return DEFER; /* just defer this TLS'd conn */
1233
1234 default:
1235 case DNS_FAIL:
1236 if (dane_required)
0e66b3b6 1237 return FAIL;
0e66b3b6
JH		 1238 break;
1239
1240 case DNS_SUCCEED:
1241 if (!dns_is_secure(dnsa))
1242 {
1243 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1244 return DEFER;
1245 }
1246 *dane = TRUE;
1247 break;
1248 }
1249return OK;
1250}
1251#endif
1252
1253
a39bd74d
JB		 1254
1255typedef struct smtp_compare_s
1256{
1257 uschar *current_sender_address;
1258 struct transport_instance *tblock;
1259} smtp_compare_t;
1260
1261/*
1262Create a unique string that identifies this message, it is based on
1263sender_address, helo_data and tls_certificate if enabled. */
1264
1265static uschar *
1266smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1267{
1268address_item * addr1;
1269uschar * if1 = US"";
1270uschar * helo1 = US"";
1271#ifdef SUPPORT_TLS
1272uschar * tlsc1 = US"";
1273#endif
1274uschar * save_sender_address = sender_address;
1275uschar * local_identity = NULL;
1276smtp_transport_options_block * ob =
1277 (smtp_transport_options_block *)tblock->options_block;
1278
1279sender_address = sender;
1280
1281addr1 = deliver_make_addr (sender, TRUE);
1282deliver_set_expansions(addr1);
1283
1284if (ob->interface)
1285 if1 = expand_string(ob->interface);
1286
1287if (ob->helo_data)
1288 helo1 = expand_string(ob->helo_data);
1289
1290#ifdef SUPPORT_TLS
1291if (ob->tls_certificate)
1292 tlsc1 = expand_string(ob->tls_certificate);
1293local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1294#else
1295local_identity = string_sprintf ("%s^%s", if1, helo1);
1296#endif
1297
1298deliver_set_expansions(NULL);
1299sender_address = save_sender_address;
1300
1301return local_identity;
1302}
1303
1304
1305
1306/* This routine is a callback that is called from transport_check_waiting.
1307This function will evaluate the incoming message versus the previous
1308message. If the incoming message is using a different local identity then
1309we will veto this new message. */
1310
1311static BOOL
1312smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1313{
dadff1d4
HSHR		 1314
1315uschar * message_local_identity,
1316 * current_local_identity,
1317 * new_sender_address;
1318
1319current_local_identity =
a39bd74d 1320 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1321
dadff1d4
HSHR		 1322if (!(new_sender_address = deliver_get_sender_address(message_id)))
1323 return 0;
1324
1325message_local_identity =
1326 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB		 1327
1328return Ustrcmp(current_local_identity, message_local_identity) == 0;
1329}
1330
1331
1332
0756eb3c
PH		 1333/*************************************************
1334* Deliver address list to given host *
1335*************************************************/
1336
1337/* If continue_hostname is not null, we get here only when continuing to
1338deliver down an existing channel. The channel was passed as the standard
6c512171
PH		 1339input. TLS is never active on a passed channel; the previous process always
1340closes it down before passing the connection on.
0756eb3c
PH		 1341
1342Otherwise, we have to make a connection to the remote host, and do the
1343initial protocol exchange.
1344
1345When running as an MUA wrapper, if the sender or any recipient is rejected,
1346temporarily or permanently, we force failure for all recipients.
1347
1348Arguments:
1349 addrlist chain of potential addresses to deliver; only those whose
1350 transport_return field is set to PENDING_DEFER are currently
1351 being processed; others should be skipped - they have either
1352 been delivered to an earlier host or IP address, or been
1353 failed by one of them.
1354 host host to deliver to
1355 host_af AF_INET or AF_INET6
2d280592 1356 port default TCP/IP port to use, in host byte order
0756eb3c
PH		 1357 interface interface to bind to, or NULL
1358 tblock transport instance block
0756eb3c
PH		 1359 message_defer set TRUE if yield is OK, but all addresses were deferred
1360 because of a non-recipient, non-host failure, that is, a
1361 4xx response to MAIL FROM, DATA, or ".". This is a defer
1362 that is specific to the message.
1363 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1364 a second attempt after TLS initialization fails
1365
1366Returns: OK - the connection was made and the delivery attempted;
1367 the result for each address is in its data block.
1368 DEFER - the connection could not be made, or something failed
1369 while setting up the SMTP session, or there was a
1370 non-message-specific error, such as a timeout.
1371 ERROR - a filter command is specified for this transport,
1372 and there was a problem setting it up; OR helo_data
1373 or add_headers or authenticated_sender is specified
1374 for this transport, and the string failed to expand
1375*/
1376
1377static int
1378smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1379 uschar *interface, transport_instance *tblock,
0756eb3c
PH		 1380 BOOL *message_defer, BOOL suppress_tls)
1381{
1382address_item *addr;
1383address_item *sync_addr;
1384address_item *first_addr = addrlist;
1385int yield = OK;
1386int address_count;
1387int save_errno;
1388int rc;
1389time_t start_delivery_time = time(NULL);
1390smtp_transport_options_block *ob =
1391 (smtp_transport_options_block *)(tblock->options_block);
1392BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1393BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH		 1394BOOL ok = FALSE;
1395BOOL send_rset = TRUE;
1396BOOL send_quit = TRUE;
1397BOOL setting_up = TRUE;
1398BOOL completed_address = FALSE;
1399BOOL esmtp = TRUE;
1400BOOL pending_MAIL;
447d236c 1401BOOL pass_message = FALSE;
8ccd00b1 1402#ifndef DISABLE_PRDR
fd98a5c6
JH		 1403BOOL prdr_offered = FALSE;
1404BOOL prdr_active;
1405#endif
7ade712c 1406#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577 1407BOOL utf8_needed = FALSE;
7ade712c
JH		 1408BOOL utf8_offered = FALSE;
1409#endif
6c1c3d1d 1410BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH		 1411#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1412BOOL dane = FALSE;
0539a19d 1413BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH		 1414dns_answer tlsa_dnsa;
1415#endif
0756eb3c
PH		 1416smtp_inblock inblock;
1417smtp_outblock outblock;
1418int max_rcpt = tblock->max_addresses;
f1513293 1419uschar *igquotstr = US"";
a39bd74d 1420
895fbaf2
JH		 1421#ifdef EXPERIMENTAL_DSN_INFO
1422uschar *smtp_greeting = NULL;
1423uschar *helo_response = NULL;
1424#endif
41c7c167 1425uschar *helo_data = NULL;
a39bd74d 1426
0756eb3c
PH		 1427uschar *message = NULL;
1428uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1429uschar *p;
1430uschar buffer[4096];
1431uschar inbuffer[4096];
98470202 1432uschar outbuffer[4096];
0756eb3c
PH		 1433
1434suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1435
1436*message_defer = FALSE;
1437smtp_command = US"initial connection";
1438if (max_rcpt == 0) max_rcpt = 999999;
1439
1440/* Set up the buffer for reading SMTP response packets. */
1441
1442inblock.buffer = inbuffer;
1443inblock.buffersize = sizeof(inbuffer);
1444inblock.ptr = inbuffer;
1445inblock.ptrend = inbuffer;
1446
1447/* Set up the buffer for holding SMTP commands while pipelining */
1448
1449outblock.buffer = outbuffer;
1450outblock.buffersize = sizeof(outbuffer);
1451outblock.ptr = outbuffer;
1452outblock.cmd_count = 0;
1453outblock.authenticating = FALSE;
1454
6c512171
PH		 1455/* Reset the parameters of a TLS session. */
1456
817d9f57
JH		 1457tls_out.bits = 0;
1458tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH		 1459tls_out.ourcert = NULL;
1460tls_out.peercert = NULL;
817d9f57
JH		 1461tls_out.peerdn = NULL;
1462#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1463tls_out.sni = NULL;
5b456975 1464#endif
018058b2 1465tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1466
35aba663
JH		 1467/* Flip the legacy TLS-related variables over to the outbound set in case
1468they're used in the context of the transport. Don't bother resetting
1469afterward as we're in a subprocess. */
1470
1471tls_modify_variables(&tls_out);
1472
061b7ebd
PP		 1473#ifndef SUPPORT_TLS
1474if (smtps)
1475 {
895fbaf2
JH		 1476 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1477 DEFER, FALSE);
018058b2 1478 return ERROR;
061b7ebd
PP		 1479 }
1480#endif
1481
0756eb3c
PH		 1482/* Make a connection to the host if this isn't a continued delivery, and handle
1483the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1484specially so they can be identified for retries. */
1485
1486if (continue_hostname == NULL)
1487 {
a7538db1 1488 /* This puts port into host->port */
0756eb3c 1489 inblock.sock = outblock.sock =
7eb6c37c 1490 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1491
0756eb3c
PH		 1492 if (inblock.sock < 0)
1493 {
895fbaf2
JH		 1494 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1495 NULL, DEFER, FALSE);
0756eb3c
PH		 1496 return DEFER;
1497 }
1498
0e66b3b6
JH		 1499#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1500 {
0e66b3b6
JH		 1501 tls_out.dane_verified = FALSE;
1502 tls_out.tlsa_usage = 0;
1503
0e66b3b6
JH		 1504 if (host->dnssec == DS_YES)
1505 {
bf7aabb4
JH		 1506 if( ( dane_required
1507 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1508 )
1509 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
038597d2 1510 && dane_required /* do not error on only dane-requested */
0e66b3b6 1511 )
4cea764f 1512 {
895fbaf2 1513 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
4cea764f
JH		 1514 string_sprintf("DANE error: tlsa lookup %s",
1515 rc == DEFER ? "DEFER" : "FAIL"),
895fbaf2 1516 rc, FALSE);
038597d2 1517 return rc;
4cea764f 1518 }
0e66b3b6
JH		 1519 }
1520 else if (dane_required)
1521 {
895fbaf2 1522 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
4cea764f 1523 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
895fbaf2 1524 FAIL, FALSE);
4cea764f 1525 return FAIL;
0e66b3b6
JH		 1526 }
1527
1528 if (dane)
1529 ob->tls_tempfail_tryclear = FALSE;
1530 }
1531#endif /*DANE*/
1532
41c7c167
PH		 1533 /* Expand the greeting message while waiting for the initial response. (Makes
1534 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1535 delayed till here so that $sending_interface and $sending_port are set. */
1536
1537 helo_data = expand_string(ob->helo_data);
810d16ad
JH		 1538#ifdef EXPERIMENTAL_INTERNATIONAL
1539 if (helo_data)
1540 {
1541 uschar * errstr = NULL;
1542 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1543 {
1544 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
895fbaf2 1545 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
810d16ad
JH		 1546 yield = DEFER;
1547 goto SEND_QUIT;
1548 }
1549 }
1550#endif
41c7c167 1551
0756eb3c
PH		 1552 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1553 is nevertheless a reasonably clean way of programming this kind of logic,
1554 where you want to escape on any error. */
1555
061b7ebd
PP		 1556 if (!smtps)
1557 {
895fbaf2
JH		 1558 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1559 '2', ob->command_timeout);
1560#ifdef EXPERIMENTAL_DSN_INFO
1561 smtp_greeting = string_copy(buffer);
1562#endif
1563 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1564
774ef2d7 1565#ifdef EXPERIMENTAL_EVENT
b30275b8 1566 {
805c9d53
JH		 1567 uschar * s;
1568 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1569 : host->dnssec==DS_NO ? US"no" : NULL;
1570 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1571 if (s)
a7538db1 1572 {
895fbaf2 1573 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
b30275b8 1574 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1575 DEFER, FALSE);
a7538db1
JH		 1576 yield = DEFER;
1577 goto SEND_QUIT;
1578 }
b30275b8 1579 }
a7538db1
JH		 1580#endif
1581
061b7ebd
PP		 1582 /* Now check if the helo_data expansion went well, and sign off cleanly if
1583 it didn't. */
41c7c167 1584
061b7ebd
PP		 1585 if (helo_data == NULL)
1586 {
1587 uschar *message = string_sprintf("failed to expand helo_data: %s",
1588 expand_string_message);
895fbaf2 1589 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP		 1590 yield = DEFER;
1591 goto SEND_QUIT;
1592 }
41c7c167
PH		 1593 }
1594
0756eb3c
PH		 1595/** Debugging without sending a message
1596addrlist->transport_return = DEFER;
1597goto SEND_QUIT;
1598**/
1599
1600 /* Errors that occur after this point follow an SMTP command, which is
1601 left in big_buffer by smtp_write_command() for use in error messages. */
1602
1603 smtp_command = big_buffer;
1604
1605 /* Tell the remote who we are...
1606
1607 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1608 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1609 greeting is of this form. The assumption was that the far end supports it
1610 properly... but experience shows that there are some that give 5xx responses,
1611 even though the banner includes "ESMTP" (there's a bloody-minded one that
1612 says "ESMTP not spoken here"). Cope with that case.
1613
1614 September 2000: Time has passed, and it seems reasonable now to always send
1615 EHLO at the start. It is also convenient to make the change while installing
1616 the TLS stuff.
1617
1618 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1619 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1620 would be no way to send out the mails, so there is now a host list
1621 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1622 PIPELINING problem as well. Maybe it can also be useful to cure other
1623 problems with broken servers.
1624
1625 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1626 Then somebody tried it with a Microsoft mailer... It seems that all other
1627 mailers use upper case for some reason (the RFC is quite clear about case
1628 independence) so, for peace of mind, I gave in. */
1629
5130845b 1630 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1631
061b7ebd
PP		 1632 /* Alas; be careful, since this goto is not an error-out, so conceivably
1633 we might set data between here and the target which we assume to exist
1634 and be usable. I can see this coming back to bite us. */
a7538db1 1635#ifdef SUPPORT_TLS
061b7ebd
PP		 1636 if (smtps)
1637 {
1638 tls_offered = TRUE;
1639 suppress_tls = FALSE;
1640 ob->tls_tempfail_tryclear = FALSE;
1641 smtp_command = US"SSL-on-connect";
1642 goto TLS_NEGOTIATE;
1643 }
a7538db1 1644#endif
061b7ebd 1645
0756eb3c
PH		 1646 if (esmtp)
1647 {
1648 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1649 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1650 goto SEND_FAILED;
1651 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1652 ob->command_timeout))
1653 {
895fbaf2
JH		 1654 if (errno != 0 || buffer[0] == 0 || lmtp)
1655 {
1656#ifdef EXPERIMENTAL_DSN_INFO
1657 helo_response = string_copy(buffer);
1658#endif
1659 goto RESPONSE_FAILED;
1660 }
0756eb3c
PH		 1661 esmtp = FALSE;
1662 }
895fbaf2
JH		 1663#ifdef EXPERIMENTAL_DSN_INFO
1664 helo_response = string_copy(buffer);
1665#endif
0756eb3c
PH		 1666 }
1667 else
1668 {
1669 DEBUG(D_transport)
1670 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1671 }
1672
1673 if (!esmtp)
1674 {
895fbaf2
JH		 1675 BOOL good_response;
1676
0756eb3c
PH		 1677 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1678 goto SEND_FAILED;
895fbaf2
JH		 1679 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1680 '2', ob->command_timeout);
1681#ifdef EXPERIMENTAL_DSN_INFO
1682 helo_response = string_copy(buffer);
1683#endif
1684 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH		 1685 }
1686
f1513293
PH		 1687 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1688 lmtp_ignore_quota option was set. */
1689
1690 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1691 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1692 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1693
0756eb3c
PH		 1694 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1695
a7538db1 1696#ifdef SUPPORT_TLS
0756eb3c
PH		 1697 tls_offered = esmtp &&
1698 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1699 PCRE_EOPT, NULL, 0) >= 0;
a7538db1 1700#endif
fd98a5c6 1701
a7538db1 1702#ifndef DISABLE_PRDR
5130845b
JH		 1703 prdr_offered = esmtp
1704 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1705 PCRE_EOPT, NULL, 0) >= 0
1706 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH		 1707
1708 if (prdr_offered)
1709 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
a7538db1 1710#endif
7ade712c
JH		 1711
1712#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577
JH		 1713 if (addrlist->prop.utf8_msg)
1714 {
1715 utf8_needed = !addrlist->prop.utf8_downcvt
1716 && !addrlist->prop.utf8_downcvt_maybe;
1717 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1718 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1719
1720 utf8_offered = esmtp
1721 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1722 PCRE_EOPT, NULL, 0) >= 0;
1723 }
7ade712c 1724#endif
0756eb3c
PH		 1725 }
1726
1727/* For continuing deliveries down the same channel, the socket is the standard
1728input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1729below). Set up the pointer to where subsequent commands will be left, for
1730error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1731set from the command line if they were set in the process that passed the
1732connection on. */
1733
895fbaf2
JH		 1734/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1735as the contine goes via transport_pass_socket() and doublefork and exec.
1736It does not wait. Unclear how we keep separate host's responses
1737separate - we could match up by host ip+port as a bodge. */
1738
0756eb3c
PH		 1739else
1740 {
1741 inblock.sock = outblock.sock = fileno(stdin);
1742 smtp_command = big_buffer;
4311097e 1743 host->port = port; /* Record the port that was used */
0756eb3c
PH		 1744 }
1745
1746/* If TLS is available on this connection, whether continued or not, attempt to
1747start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1748send another EHLO - the server may give a different answer in secure mode. We
1749use a separate buffer for reading the response to STARTTLS so that if it is
1750negative, the original EHLO data is available for subsequent analysis, should
1751the client not be required to use TLS. If the response is bad, copy the buffer
1752for error analysis. */
1753
1754#ifdef SUPPORT_TLS
5130845b
JH		 1755if ( tls_offered
1756 && !suppress_tls
1757 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH		 1758 {
1759 uschar buffer2[4096];
1760 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1761 goto SEND_FAILED;
1762
1763 /* If there is an I/O error, transmission of this message is deferred. If
1764 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1765 false, we also defer. However, if there is a temporary rejection of STARTTLS
1766 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1767 STARTTLS, we carry on. This means we will try to send the message in clear,
1768 unless the host is in hosts_require_tls (tested below). */
1769
1770 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1771 ob->command_timeout))
1772 {
0756eb3c
PH		 1773 if (errno != 0 || buffer2[0] == 0 ||
1774 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK		 1775 {
1776 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1777 goto RESPONSE_FAILED;
0dda4340 1778 }
0756eb3c
PH		 1779 }
1780
1781 /* STARTTLS accepted: try to negotiate a TLS session. */
1782
1783 else
061b7ebd 1784 TLS_NEGOTIATE:
0756eb3c 1785 {
0e66b3b6
JH		 1786 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1787# ifdef EXPERIMENTAL_DANE
1788 , dane ? &tlsa_dnsa : NULL
1789# endif
1790 );
0756eb3c
PH		 1791
1792 /* TLS negotiation failed; give an error. From outside, this function may
1793 be called again to try in clear on a new connection, if the options permit
1794 it for this host. */
1795
1796 if (rc != OK)
1797 {
6ebd79ec
JH		 1798# ifdef EXPERIMENTAL_DANE
1799 if (rc == DEFER && dane && !dane_required)
1800 {
1801 log_write(0, LOG_MAIN, "DANE attempt failed;"
1802 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1803 host->name, host->address);
1804 dane = FALSE;
1805 goto TLS_NEGOTIATE;
1806 }
1807# endif
1808
0756eb3c
PH		 1809 save_errno = ERRNO_TLSFAILURE;
1810 message = US"failure while setting up TLS session";
1811 send_quit = FALSE;
1812 goto TLS_FAILED;
1813 }
1814
1815 /* TLS session is set up */
1816
895fbaf2 1817 for (addr = addrlist; addr; addr = addr->next)
5ca2a9a1
PH		 1818 if (addr->transport_return == PENDING_DEFER)
1819 {
817d9f57 1820 addr->cipher = tls_out.cipher;
9d1c15ef
JH		 1821 addr->ourcert = tls_out.ourcert;
1822 addr->peercert = tls_out.peercert;
817d9f57 1823 addr->peerdn = tls_out.peerdn;
018058b2 1824 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1825 }
0756eb3c
PH		 1826 }
1827 }
1828
061b7ebd
PP		 1829/* if smtps, we'll have smtp_command set to something else; always safe to
1830reset it here. */
1831smtp_command = big_buffer;
1832
41c7c167
PH		 1833/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1834helo_data is null, we are dealing with a connection that was passed from
1835another process, and so we won't have expanded helo_data above. We have to
1836expand it here. $sending_ip_address and $sending_port are set up right at the
1837start of the Exim process (in exim.c). */
0756eb3c 1838
817d9f57 1839if (tls_out.active >= 0)
0756eb3c 1840 {
061b7ebd 1841 char *greeting_cmd;
895fbaf2
JH		 1842 BOOL good_response;
1843
41c7c167
PH		 1844 if (helo_data == NULL)
1845 {
1846 helo_data = expand_string(ob->helo_data);
1847 if (helo_data == NULL)
1848 {
1849 uschar *message = string_sprintf("failed to expand helo_data: %s",
1850 expand_string_message);
895fbaf2 1851 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
41c7c167
PH		 1852 yield = DEFER;
1853 goto SEND_QUIT;
1854 }
1855 }
1856
0d0e4455 1857 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP		 1858 if (smtps)
1859 {
895fbaf2
JH		 1860 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1861 '2', ob->command_timeout);
1862#ifdef EXPERIMENTAL_DSN_INFO
1863 smtp_greeting = string_copy(buffer);
1864#endif
1865 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP		 1866 }
1867
1868 if (esmtp)
1869 greeting_cmd = "EHLO";
1870 else
1871 {
1872 greeting_cmd = "HELO";
1873 DEBUG(D_transport)
1874 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP		 1875 }
1876
1877 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1878 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c 1879 goto SEND_FAILED;
895fbaf2
JH		 1880 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1881 '2', ob->command_timeout);
1882#ifdef EXPERIMENTAL_DSN_INFO
1883 helo_response = string_copy(buffer);
1884#endif
1885 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH		 1886 }
1887
1888/* If the host is required to use a secure channel, ensure that we
1889have one. */
1890
0e66b3b6
JH		 1891else if (
1892# ifdef EXPERIMENTAL_DANE
1893 dane ||
1894# endif
5130845b 1895 verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1896 )
0756eb3c
PH		 1897 {
1898 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1899 message = string_sprintf("a TLS session is required, but %s",
0756eb3c
PH		 1900 tls_offered? "an attempt to start TLS failed" :
1901 "the server did not offer TLS support");
1902 goto TLS_FAILED;
1903 }
0e66b3b6 1904#endif /*SUPPORT_TLS*/
0756eb3c
PH		 1905
1906/* If TLS is active, we have just started it up and re-done the EHLO command,
1907so its response needs to be analyzed. If TLS is not active and this is a
1908continued session down a previously-used socket, we haven't just done EHLO, so
1909we skip this. */
1910
1911if (continue_hostname == NULL
a7538db1 1912#ifdef SUPPORT_TLS
817d9f57 1913 || tls_out.active >= 0
a7538db1 1914#endif
0756eb3c
PH		 1915 )
1916 {
f1513293
PH		 1917 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1918 lmtp_ignore_quota option was set. */
1919
1920 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1921 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1922 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1923
0756eb3c
PH		 1924 /* If the response to EHLO specified support for the SIZE parameter, note
1925 this, provided size_addition is non-negative. */
1926
1927 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1928 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1929 PCRE_EOPT, NULL, 0) >= 0;
1930
1931 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH		 1932 the current host, esmtp will be false, so PIPELINING can never be used. If
1933 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1934
5130845b
JH		 1935 smtp_use_pipelining = esmtp
1936 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1937 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1938 PCRE_EOPT, NULL, 0) >= 0;
0756eb3c
PH		 1939
1940 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1941 smtp_use_pipelining? "" : "not ");
1942
8ccd00b1 1943#ifndef DISABLE_PRDR
5130845b
JH		 1944 prdr_offered = esmtp
1945 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
7ade712c 1946 PCRE_EOPT, NULL, 0) >= 0
5130845b 1947 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH		 1948
1949 if (prdr_offered)
1950 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1951#endif
1952
7ade712c 1953#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577
JH		 1954 if (addrlist->prop.utf8_msg)
1955 utf8_offered = esmtp
1956 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1957 PCRE_EOPT, NULL, 0) >= 0;
7ade712c
JH		 1958#endif
1959
6c1c3d1d 1960 /* Note if the server supports DSN */
7ade712c
JH		 1961 smtp_use_dsn = esmtp
1962 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1963 PCRE_EOPT, NULL, 0) >= 0;
6c1c3d1d 1964 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
6c1c3d1d 1965
0756eb3c
PH		 1966 /* Note if the response to EHLO specifies support for the AUTH extension.
1967 If it has, check that this host is one we want to authenticate to, and do
1968 the business. The host name and address must be available when the
1969 authenticator's client driver is running. */
1970
fcc8e047
JH		 1971 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1972 ob, esmtp, &inblock, &outblock))
0756eb3c 1973 {
fcc8e047
JH		 1974 default: goto SEND_QUIT;
1975 case OK: break;
1976 case FAIL_SEND: goto SEND_FAILED;
1977 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH		 1978 }
1979 }
1980
1981/* The setting up of the SMTP call is now complete. Any subsequent errors are
1982message-specific. */
1983
1984setting_up = FALSE;
1985
7ade712c
JH		 1986#ifdef EXPERIMENTAL_INTERNATIONAL
1987/* If this is an international message we need the host to speak SMTPUTF8 */
3c8b3577 1988if (utf8_needed && !utf8_offered)
7ade712c
JH		 1989 {
1990 errno = ERRNO_UTF8_FWD;
1991 goto RESPONSE_FAILED;
1992 }
1993#endif
1994
0756eb3c
PH		 1995/* If there is a filter command specified for this transport, we can now
1996set it up. This cannot be done until the identify of the host is known. */
1997
1998if (tblock->filter_command != NULL)
1999 {
2000 BOOL rc;
2001 uschar buffer[64];
2002 sprintf(CS buffer, "%.50s transport", tblock->name);
2003 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2004 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 2005 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH		 2006
2007 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2008 yield ERROR. */
2009
2010 if (!rc)
2011 {
895fbaf2
JH		 2012 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2013 FALSE);
0756eb3c
PH		 2014 yield = ERROR;
2015 goto SEND_QUIT;
2016 }
2017 }
2018
2019
2020/* For messages that have more than the maximum number of envelope recipients,
2021we want to send several transactions down the same SMTP connection. (See
2022comments in deliver.c as to how this reconciles, heuristically, with
2023remote_max_parallel.) This optimization was added to Exim after the following
2024code was already working. The simplest way to put it in without disturbing the
2025code was to use a goto to jump back to this point when there is another
2026transaction to handle. */
2027
2028SEND_MESSAGE:
2029sync_addr = first_addr;
2030address_count = 0;
2031ok = FALSE;
2032send_rset = TRUE;
2033completed_address = FALSE;
2034
2035
2036/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2037qualification, send it, adding something to the message size to allow for
2038imprecision and things that get added en route. Exim keeps the number of lines
2039in a message, so we can give an accurate value for the original message, but we
2040need some additional to handle added headers. (Double "." characters don't get
2041included in the count.) */
2042
2043p = buffer;
2044*p = 0;
2045
2046if (smtp_use_size)
2047 {
2048 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2049 while (*p) p++;
2050 }
2051
8ccd00b1 2052#ifndef DISABLE_PRDR
fd98a5c6
JH		 2053prdr_active = FALSE;
2054if (prdr_offered)
2055 {
2056 for (addr = first_addr; addr; addr = addr->next)
2057 if (addr->transport_return == PENDING_DEFER)
2058 {
2059 for (addr = addr->next; addr; addr = addr->next)
2060 if (addr->transport_return == PENDING_DEFER)
2061 { /* at least two recipients to send */
2062 prdr_active = TRUE;
2063 sprintf(CS p, " PRDR"); p += 5;
a7538db1 2064 break;
fd98a5c6
JH		 2065 }
2066 break;
2067 }
2068 }
fd98a5c6
JH		 2069#endif
2070
7ade712c 2071#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577 2072if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
7ade712c
JH		 2073 sprintf(CS p, " SMTPUTF8"), p += 9;
2074#endif
2075
6c1c3d1d
WB		 2076/* check if all addresses have lasthop flag */
2077/* do not send RET and ENVID if true */
7ade712c 2078for (dsn_all_lasthop = TRUE, addr = first_addr;
6c1c3d1d
WB		 2079 address_count < max_rcpt && addr != NULL;
2080 addr = addr->next)
2081 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
7ade712c 2082 {
6c1c3d1d 2083 dsn_all_lasthop = FALSE;
7ade712c
JH		 2084 break;
2085 }
6c1c3d1d
WB		 2086
2087/* Add any DSN flags to the mail command */
2088
7ade712c 2089if (smtp_use_dsn && !dsn_all_lasthop)
6c1c3d1d
WB		 2090 {
2091 if (dsn_ret == dsn_ret_hdrs)
2092 {
45500060 2093 Ustrcpy(p, " RET=HDRS");
6c1c3d1d
WB		 2094 while (*p) p++;
2095 }
2096 else if (dsn_ret == dsn_ret_full)
2097 {
45500060 2098 Ustrcpy(p, " RET=FULL");
6c1c3d1d
WB		 2099 while (*p) p++;
2100 }
2101 if (dsn_envid != NULL)
2102 {
2103 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2104 while (*p) p++;
2105 }
2106 }
6c1c3d1d 2107
6b62e899
JH		 2108/* If an authenticated_sender override has been specified for this transport
2109instance, expand it. If the expansion is forced to fail, and there was already
2110an authenticated_sender for this message, the original value will be used.
2111Other expansion failures are serious. An empty result is ignored, but there is
2112otherwise no check - this feature is expected to be used with LMTP and other
2113cases where non-standard addresses (e.g. without domains) might be required. */
2114
fcc8e047 2115if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH		 2116 {
2117 yield = ERROR;
2118 goto SEND_QUIT;
2119 }
0756eb3c
PH		 2120
2121/* From here until we send the DATA command, we can make use of PIPELINING
2122if the server host supports it. The code has to be able to check the responses
2123at any point, for when the buffer fills up, so we write it totally generally.
2124When PIPELINING is off, each command written reports that it has flushed the
2125buffer. */
2126
2127pending_MAIL = TRUE; /* The block starts with MAIL */
2128
3c8b3577
JH		 2129 {
2130 uschar * s = return_path;
2131#ifdef EXPERIMENTAL_INTERNATIONAL
2132 uschar * errstr = NULL;
2133
2134 /* If we must downconvert, do the from-address here. Remember we had to
2135 for the to-addresses (done below), and also (ugly) for re-doing when building
2136 the delivery log line. */
2137
2138 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2139 {
2140 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2141 {
895fbaf2 2142 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3c8b3577
JH		 2143 yield = ERROR;
2144 goto SEND_QUIT;
2145 }
2146 setflag(addrlist, af_utf8_downcvt);
2147 }
2148#endif
2149
2150 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2151 "MAIL FROM:<%s>%s\r\n", s, buffer);
2152 }
2153
0756eb3c
PH		 2154mail_command = string_copy(big_buffer); /* Save for later error message */
2155
2156switch(rc)
2157 {
2158 case -1: /* Transmission error */
7ade712c 2159 goto SEND_FAILED;
0756eb3c
PH		 2160
2161 case +1: /* Block was sent */
7ade712c 2162 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc 2163 ob->command_timeout))
e97957bc 2164 {
7ade712c
JH		 2165 if (errno == 0 && buffer[0] == '4')
2166 {
2167 errno = ERRNO_MAIL4XX;
2168 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2169 }
2170 goto RESPONSE_FAILED;
e97957bc 2171 }
7ade712c
JH		 2172 pending_MAIL = FALSE;
2173 break;
0756eb3c
PH		 2174 }
2175
2176/* Pass over all the relevant recipient addresses for this host, which are the
2177ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2178several before we have to read the responses for those seen so far. This
2179checking is done by a subroutine because it also needs to be done at the end.
2180Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2181the next one if not all are sent.
2182
2183In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2184last address because we want to abort if any recipients have any kind of
2185problem, temporary or permanent. We know that all recipient addresses will have
2186the PENDING_DEFER status, because only one attempt is ever made, and we know
2187that max_rcpt will be large, so all addresses will be done at once. */
2188
2189for (addr = first_addr;
2190 address_count < max_rcpt && addr != NULL;
2191 addr = addr->next)
2192 {
2193 int count;
2194 BOOL no_flush;
3c8b3577 2195 uschar * rcpt_addr;
0756eb3c 2196
a7538db1 2197 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2198
0756eb3c
PH		 2199 if (addr->transport_return != PENDING_DEFER) continue;
2200
2201 address_count++;
2202 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2203
6c1c3d1d
WB		 2204 /* Add any DSN flags to the rcpt command and add to the sent string */
2205
2206 p = buffer;
2207 *p = 0;
2208
a7538db1 2209 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB		 2210 {
2211 if ((addr->dsn_flags & rf_dsnflags) != 0)
2212 {
2213 int i;
2214 BOOL first = TRUE;
45500060 2215 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB		 2216 while (*p) p++;
2217 for (i = 0; i < 4; i++)
6c1c3d1d
WB		 2218 if ((addr->dsn_flags & rf_list[i]) != 0)
2219 {
2220 if (!first) *p++ = ',';
2221 first = FALSE;
45500060 2222 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB		 2223 while (*p) p++;
2224 }
6c1c3d1d
WB		 2225 }
2226
a7538db1
JH		 2227 if (addr->dsn_orcpt != NULL)
2228 {
6c1c3d1d
WB		 2229 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2230 addr->dsn_orcpt);
2231 while (*p) p++;
2232 }
2233 }
6c1c3d1d 2234
0756eb3c
PH		 2235 /* Now send the RCPT command, and process outstanding responses when
2236 necessary. After a timeout on RCPT, we just end the function, leaving the
2237 yield as OK, because this error can often mean that there is a problem with
2238 just one address, so we don't want to delay the host. */
2239
3c8b3577
JH		 2240 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2241
2242#ifdef EXPERIMENTAL_INTERNATIONAL
2243 {
2244 uschar * dummy_errstr;
2245 if ( testflag(addrlist, af_utf8_downcvt)
2246 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2247 dummy_errstr
2248 ) )
2249 {
2250 errno = ERRNO_EXPANDFAIL;
2251 goto SEND_FAILED;
2252 }
2253 }
2254#endif
2255
6c1c3d1d 2256 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
3c8b3577 2257 rcpt_addr, igquotstr, buffer);
6c1c3d1d 2258
0756eb3c
PH		 2259 if (count < 0) goto SEND_FAILED;
2260 if (count > 0)
2261 {
2262 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH		 2263 &sync_addr, host, count, ob->address_retry_include_sender,
2264 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2265 sizeof(buffer)))
0756eb3c
PH		 2266 {
2267 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2268 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2269 break;
2270
2271 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2272 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2273 case 0: /* No 2xx or 5xx, but no probs */
2274 break;
2275
2276 case -1: goto END_OFF; /* Timeout on RCPT */
2277 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2278 }
2279 pending_MAIL = FALSE; /* Dealt with MAIL */
2280 }
2281 } /* Loop for next address */
2282
2283/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2284permanently or temporarily. We should have flushed and synced after the last
2285RCPT. */
2286
2287if (mua_wrapper)
2288 {
2289 address_item *badaddr;
168dec3b
JH		 2290 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2291 if (badaddr->transport_return != PENDING_OK)
2292 {
2293 /*XXX could we find a better errno than 0 here? */
895fbaf2
JH		 2294 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2295 testflag(badaddr, af_pass_message));
168dec3b
JH		 2296 ok = FALSE;
2297 break;
2298 }
0756eb3c
PH		 2299 }
2300
2301/* If ok is TRUE, we know we have got at least one good recipient, and must now
2302send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2303have a good recipient buffered up if we are pipelining. We don't want to waste
2304time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2305are pipelining. The responses are all handled by sync_responses(). */
2306
2307if (ok || (smtp_use_pipelining && !mua_wrapper))
2308 {
2309 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2310 if (count < 0) goto SEND_FAILED;
2311 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH		 2312 host, count, ob->address_retry_include_sender, pending_MAIL,
2313 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH		 2314 {
2315 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2316 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2317 break;
2318
2319 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2320 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2321 case 0: break; /* No 2xx or 5xx, but no probs */
2322
2323 case -1: goto END_OFF; /* Timeout on RCPT */
2324 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2325 }
2326 }
2327
2328/* Save the first address of the next batch. */
2329
2330first_addr = addr;
2331
2332/* If there were no good recipients (but otherwise there have been no
2333problems), just set ok TRUE, since we have handled address-specific errors
2334already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2335for handling the SMTP dot-handling protocol, flagging to apply to headers as
2336well as body. Set the appropriate timeout value to be used for each chunk.
2337(Haven't been able to make it work using select() for writing yet.) */
2338
2339if (!ok) ok = TRUE; else
2340 {
2341 sigalrm_seen = FALSE;
2342 transport_write_timeout = ob->data_timeout;
2343 smtp_command = US"sending data block"; /* For error messages */
2344 DEBUG(D_transport|D_v)
2345 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2346 transport_count = 0;
a7538db1 2347
80a47a2c 2348#ifndef DISABLE_DKIM
4cd12fe9
TK		 2349 ok = dkim_transport_write_message(addrlist, inblock.sock,
2350 topt_use_crlf | topt_end_dot | topt_escape_headers |
2351 (tblock->body_only? topt_no_headers : 0) |
2352 (tblock->headers_only? topt_no_body : 0) |
2353 (tblock->return_path_add? topt_add_return_path : 0) |
2354 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2355 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2356 0, /* No size limit */
2357 tblock->add_headers, tblock->remove_headers,
2358 US".", US"..", /* Escaping strings */
2359 tblock->rewrite_rules, tblock->rewrite_existflags,
2360 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2361 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK		 2362 );
2363#else
0756eb3c
PH		 2364 ok = transport_write_message(addrlist, inblock.sock,
2365 topt_use_crlf | topt_end_dot | topt_escape_headers |
2366 (tblock->body_only? topt_no_headers : 0) |
2367 (tblock->headers_only? topt_no_body : 0) |
2368 (tblock->return_path_add? topt_add_return_path : 0) |
2369 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2370 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2371 0, /* No size limit */
2372 tblock->add_headers, tblock->remove_headers,
2373 US".", US"..", /* Escaping strings */
2374 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2375#endif
0756eb3c
PH		 2376
2377 /* transport_write_message() uses write() because it is called from other
2378 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2379 it can exit with "Broken pipe" as its error. This really means that the
2380 socket got closed at the far end. */
2381
2382 transport_write_timeout = 0; /* for subsequent transports */
2383
2384 /* Failure can either be some kind of I/O disaster (including timeout),
2385 or the failure of a transport filter or the expansion of added headers. */
2386
2387 if (!ok)
2388 {
2389 buffer[0] = 0; /* There hasn't been a response */
2390 goto RESPONSE_FAILED;
2391 }
2392
2393 /* We used to send the terminating "." explicitly here, but because of
2394 buffering effects at both ends of TCP/IP connections, you don't gain
2395 anything by keeping it separate, so it might as well go in the final
2396 data buffer for efficiency. This is now done by setting the topt_end_dot
2397 flag above. */
2398
2399 smtp_command = US"end of data";
2400
8ccd00b1 2401#ifndef DISABLE_PRDR
fd98a5c6
JH		 2402 /* For PRDR we optionally get a partial-responses warning
2403 * followed by the individual responses, before going on with
2404 * the overall response. If we don't get the warning then deal
2405 * with per non-PRDR. */
2406 if(prdr_active)
2407 {
2408 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2409 ob->final_timeout);
2410 if (!ok && errno == 0)
2411 switch(buffer[0])
2412 {
2413 case '2': prdr_active = FALSE;
2414 ok = TRUE;
2415 break;
2416 case '4': errno = ERRNO_DATA4XX;
2417 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2418 break;
2419 }
2420 }
2421 else
2422#endif
2423
2424 /* For non-PRDR SMTP, we now read a single response that applies to the
2425 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2426
e97957bc
PH		 2427 if (!lmtp)
2428 {
2429 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2430 ob->final_timeout);
2431 if (!ok && errno == 0 && buffer[0] == '4')
2432 {
2433 errno = ERRNO_DATA4XX;
2434 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2435 }
2436 }
0756eb3c
PH		 2437
2438 /* For LMTP, we get back a response for every RCPT command that we sent;
2439 some may be accepted and some rejected. For those that get a response, their
2440 status is fixed; any that are accepted have been handed over, even if later
2441 responses crash - at least, that's how I read RFC 2033.
2442
2443 If all went well, mark the recipient addresses as completed, record which
2444 host/IPaddress they were delivered to, and cut out RSET when sending another
2445 message down the same channel. Write the completed addresses to the journal
2446 now so that they are recorded in case there is a crash of hardware or
2447 software before the spool gets updated. Also record the final SMTP
2448 confirmation if needed (for SMTP only). */
2449
2450 if (ok)
2451 {
2452 int flag = '=';
2453 int delivery_time = (int)(time(NULL) - start_delivery_time);
2454 int len;
0756eb3c
PH		 2455 uschar *conf = NULL;
2456 send_rset = FALSE;
2457
0756eb3c
PH		 2458 /* Set up confirmation if needed - applies only to SMTP */
2459
d68218c7 2460 if (
774ef2d7 2461#ifndef EXPERIMENTAL_EVENT
6c6d6e48 2462 LOGGING(smtp_confirmation) &&
a7538db1 2463#endif
d68218c7
JH		 2464 !lmtp
2465 )
0756eb3c 2466 {
55414b25
JH		 2467 const uschar *s = string_printing(buffer);
2468 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2469 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH		 2470 }
2471
fd98a5c6 2472 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH		 2473 each one. */
2474
2475 for (addr = addrlist; addr != first_addr; addr = addr->next)
2476 {
2477 if (addr->transport_return != PENDING_OK) continue;
2478
2479 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2480 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH		 2481 address. For temporary errors, add a retry item for the address so that
2482 it doesn't get tried again too soon. */
0756eb3c 2483
8ccd00b1 2484#ifndef DISABLE_PRDR
fd98a5c6
JH		 2485 if (lmtp || prdr_active)
2486#else
0756eb3c 2487 if (lmtp)
fd98a5c6 2488#endif
0756eb3c
PH		 2489 {
2490 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2491 ob->final_timeout))
2492 {
2493 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2494 addr->message = string_sprintf(
8ccd00b1 2495#ifndef DISABLE_PRDR
fd98a5c6
JH		 2496 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2497#else
2498 "LMTP error after %s: %s",
2499#endif
0756eb3c 2500 big_buffer, string_printing(buffer));
75def545
PH		 2501 setflag(addr, af_pass_message); /* Allow message to go to user */
2502 if (buffer[0] == '5')
2503 addr->transport_return = FAIL;
2504 else
2505 {
e97957bc
PH		 2506 errno = ERRNO_DATA4XX;
2507 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2508 addr->transport_return = DEFER;
8ccd00b1 2509#ifndef DISABLE_PRDR
fd98a5c6
JH		 2510 if (!prdr_active)
2511#endif
2512 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2513 }
0756eb3c
PH		 2514 continue;
2515 }
2516 completed_address = TRUE; /* NOW we can set this flag */
6c6d6e48 2517 if (LOGGING(smtp_confirmation))
c0ea85ab 2518 {
55414b25
JH		 2519 const uschar *s = string_printing(buffer);
2520 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2521 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2522 }
0756eb3c
PH		 2523 }
2524
2525 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2526 actual host that was used. */
0756eb3c
PH		 2527
2528 addr->transport_return = OK;
2529 addr->more_errno = delivery_time;
d427a7f9 2530 addr->host_used = host;
0756eb3c
PH		 2531 addr->special_action = flag;
2532 addr->message = conf;
8ccd00b1 2533#ifndef DISABLE_PRDR
fd98a5c6
JH		 2534 if (prdr_active) addr->flags |= af_prdr_used;
2535#endif
0756eb3c
PH		 2536 flag = '-';
2537
8ccd00b1 2538#ifndef DISABLE_PRDR
fd98a5c6
JH		 2539 if (!prdr_active)
2540#endif
2541 {
2542 /* Update the journal. For homonymic addresses, use the base address plus
2543 the transport name. See lots of comments in deliver.c about the reasons
2544 for the complications when homonyms are involved. Just carry on after
2545 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2546
fd98a5c6
JH		 2547 if (testflag(addr, af_homonym))
2548 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2549 else
2550 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2551
895fbaf2 2552 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
fd98a5c6
JH		 2553 len = Ustrlen(CS buffer);
2554 if (write(journal_fd, buffer, len) != len)
2555 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2556 "%s: %s", buffer, strerror(errno));
2557 }
0756eb3c
PH		 2558 }
2559
8ccd00b1 2560#ifndef DISABLE_PRDR
fd98a5c6
JH		 2561 if (prdr_active)
2562 {
2563 /* PRDR - get the final, overall response. For any non-success
2564 upgrade all the address statuses. */
2565 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2566 ob->final_timeout);
2567 if (!ok)
2568 {
2569 if(errno == 0 && buffer[0] == '4')
2570 {
2571 errno = ERRNO_DATA4XX;
2572 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2573 }
2574 for (addr = addrlist; addr != first_addr; addr = addr->next)
2575 if (buffer[0] == '5' || addr->transport_return == OK)
2576 addr->transport_return = PENDING_OK; /* allow set_errno action */
2577 goto RESPONSE_FAILED;
2578 }
2579
2580 /* Update the journal, or setup retry. */
2581 for (addr = addrlist; addr != first_addr; addr = addr->next)
2582 if (addr->transport_return == OK)
2583 {
2584 if (testflag(addr, af_homonym))
2585 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2586 else
2587 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2588
895fbaf2 2589 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
fd98a5c6
JH		 2590 len = Ustrlen(CS buffer);
2591 if (write(journal_fd, buffer, len) != len)
2592 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2593 "%s: %s", buffer, strerror(errno));
2594 }
2595 else if (addr->transport_return == DEFER)
2596 retry_add_item(addr, addr->address_retry_key, -2);
2597 }
2598#endif
2599
0756eb3c
PH		 2600 /* Ensure the journal file is pushed out to disk. */
2601
54fc8428 2602 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH		 2603 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2604 strerror(errno));
2605 }
2606 }
2607
2608
2609/* Handle general (not specific to one address) failures here. The value of ok
2610is used to skip over this code on the falling through case. A timeout causes a
2611deferral. Other errors may defer or fail according to the response code, and
2612may set up a special errno value, e.g. after connection chopped, which is
2613assumed if errno == 0 and there is no text in the buffer. If control reaches
2614here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2615the problem is not related to this specific message. */
2616
2617if (!ok)
2618 {
895fbaf2
JH		 2619 int code, set_rc;
2620 uschar * set_message;
0756eb3c
PH		 2621
2622 RESPONSE_FAILED:
895fbaf2
JH		 2623 {
2624 save_errno = errno;
2625 message = NULL;
2626 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2627 buffer, &code, &message, &pass_message);
2628 goto FAILED;
2629 }
0756eb3c
PH		 2630
2631 SEND_FAILED:
895fbaf2
JH		 2632 {
2633 save_errno = errno;
2634 code = '4';
2635 message = US string_sprintf("send() to %s [%s] failed: %s",
2636 host->name, host->address, strerror(save_errno));
2637 send_quit = FALSE;
2638 goto FAILED;
2639 }
0756eb3c
PH		 2640
2641 /* This label is jumped to directly when a TLS negotiation has failed,
2642 or was not done for a host for which it is required. Values will be set
2643 in message and save_errno, and setting_up will always be true. Treat as
2644 a temporary error. */
2645
a7538db1 2646#ifdef SUPPORT_TLS
0756eb3c
PH		 2647 TLS_FAILED:
2648 code = '4';
a7538db1 2649#endif
0756eb3c
PH		 2650
2651 /* If the failure happened while setting up the call, see if the failure was
2652 a 5xx response (this will either be on connection, or following HELO - a 5xx
2653 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2654 never going to accept them. For other errors during setting up (timeouts or
2655 whatever), defer all addresses, and yield DEFER, so that the host is not
2656 tried again for a while. */
2657
2658 FAILED:
2659 ok = FALSE; /* For when reached by GOTO */
895fbaf2 2660 set_message = message;
0756eb3c
PH		 2661
2662 if (setting_up)
2663 {
2664 if (code == '5')
895fbaf2 2665 set_rc = FAIL;
0756eb3c 2666 else
895fbaf2 2667 yield = set_rc = DEFER;
0756eb3c
PH		 2668 }
2669
e97957bc 2670 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2671 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH		 2672 the contents of the message rather than a real error on the connection. These
2673 cases are treated in the same way as a 4xx response. This next bit of code
2674 does the classification. */
0756eb3c 2675
e97957bc 2676 else
0756eb3c 2677 {
e97957bc 2678 BOOL message_error;
0756eb3c 2679
e97957bc
PH		 2680 switch(save_errno)
2681 {
250b6871
JH		 2682#ifdef EXPERIMENTAL_INTERNATIONAL
2683 case ERRNO_UTF8_FWD:
2684 code = '5';
2685 /*FALLTHROUGH*/
2686#endif
e97957bc
PH		 2687 case 0:
2688 case ERRNO_MAIL4XX:
2689 case ERRNO_DATA4XX:
250b6871
JH		 2690 message_error = TRUE;
2691 break;
0756eb3c 2692
e97957bc 2693 case ETIMEDOUT:
250b6871
JH		 2694 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2695 Ustrncmp(smtp_command,"end ",4) == 0;
2696 break;
e97957bc
PH		 2697
2698 case ERRNO_SMTPCLOSED:
250b6871
JH		 2699 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2700 break;
e97957bc
PH		 2701
2702 default:
250b6871
JH		 2703 message_error = FALSE;
2704 break;
e97957bc 2705 }
0756eb3c 2706
e97957bc 2707 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2708
e97957bc
PH		 2709 (a) negative response or timeout after MAIL
2710 (b) negative response after DATA
2711 (c) negative response or timeout or dropped connection after "."
250b6871 2712 (d) utf8 support required and not offered
0756eb3c 2713
e97957bc
PH		 2714 It won't be a negative response or timeout after RCPT, as that is dealt
2715 with separately above. The action in all cases is to set an appropriate
2716 error code for all the addresses, but to leave yield set to OK because the
2717 host itself has not failed. Of course, it might in practice have failed
2718 when we've had a timeout, but if so, we'll discover that at the next
2719 delivery attempt. For a temporary error, set the message_defer flag, and
2720 write to the logs for information if this is not the last host. The error
2721 for the last host will be logged as part of the address's log line. */
2722
2723 if (message_error)
0756eb3c 2724 {
e97957bc 2725 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
e97957bc
PH		 2726
2727 /* If there's an errno, the message contains just the identity of
2728 the host. */
2729
895fbaf2
JH		 2730 if (code == '5')
2731 set_rc = FAIL;
2732 else /* Anything other than 5 is treated as temporary */
e97957bc 2733 {
895fbaf2 2734 set_rc = DEFER;
e97957bc
PH		 2735 if (save_errno > 0)
2736 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2737 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2738 msglog_line(host, message);
e97957bc
PH		 2739 *message_defer = TRUE;
2740 }
2741 }
2742
2743 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2744 ".", or some other transportation error. We defer all addresses and yield
2745 DEFER, except for the case of failed add_headers expansion, or a transport
2746 filter failure, when the yield should be ERROR, to stop it trying other
2747 hosts. */
2748
2749 else
2750 {
895fbaf2 2751 set_rc = DEFER;
e97957bc
PH		 2752 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2753 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
0756eb3c
PH		 2754 }
2755 }
895fbaf2
JH		 2756
2757 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2758#ifdef EXPERIMENTAL_DSN_INFO
2759 , smtp_greeting, helo_response
2760#endif
2761 );
0756eb3c
PH		 2762 }
2763
2764
2765/* If all has gone well, send_quit will be set TRUE, implying we can end the
2766SMTP session tidily. However, if there were too many addresses to send in one
2767message (indicated by first_addr being non-NULL) we want to carry on with the
2768rest of them. Also, it is desirable to send more than one message down the SMTP
2769connection if there are several waiting, provided we haven't already sent so
2770many as to hit the configured limit. The function transport_check_waiting looks
2771for a waiting message and returns its id. Then transport_pass_socket tries to
2772set up a continued delivery by passing the socket on to another process. The
2773variable send_rset is FALSE if a message has just been successfully transfered.
2774
2775If we are already sending down a continued channel, there may be further
2776addresses not yet delivered that are aimed at the same host, but which have not
2777been passed in this run of the transport. In this case, continue_more will be
2778true, and all we should do is send RSET if necessary, and return, leaving the
2779channel open.
2780
2781However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2782do not want to continue with other messages down the same channel, because that
2783can lead to looping between two or more messages, all with the same,
2784temporarily failing address(es). [The retry information isn't updated yet, so
2785new processes keep on trying.] We probably also don't want to try more of this
2786message's addresses either.
2787
2788If we have started a TLS session, we have to end it before passing the
2789connection to a new process. However, not all servers can handle this (Exim
2790can), so we do not pass such a connection on if the host matches
2791hosts_nopass_tls. */
2792
2793DEBUG(D_transport)
2794 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2795 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2796 continue_more, yield, (first_addr == NULL)? "":"not ");
2797
2798if (completed_address && ok && send_quit)
2799 {
2800 BOOL more;
a39bd74d
JB		 2801 smtp_compare_t t_compare;
2802
2803 t_compare.tblock = tblock;
2804 t_compare.current_sender_address = sender_address;
2805
5130845b
JH		 2806 if ( first_addr != NULL
2807 || continue_more
2808 || ( ( tls_out.active < 0
2809 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2810 )
0756eb3c
PH		 2811 &&
2812 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB		 2813 tblock->connection_max_messages, new_message_id, &more,
2814 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 2815 ) )
0756eb3c
PH		 2816 {
2817 uschar *msg;
447d236c 2818 BOOL pass_message;
0756eb3c
PH		 2819
2820 if (send_rset)
2821 {
2822 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2823 {
2824 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2825 host->address, strerror(save_errno));
2826 send_quit = FALSE;
2827 }
2828 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2829 ob->command_timeout)))
2830 {
2831 int code;
447d236c
PH		 2832 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2833 &pass_message);
0756eb3c
PH		 2834 if (!send_quit)
2835 {
c562fd30
JH		 2836 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2837 host->name, host->address, msg);
0756eb3c
PH		 2838 }
2839 }
2840 }
2841
2842 /* Either RSET was not needed, or it succeeded */
2843
2844 if (ok)
2845 {
2846 if (first_addr != NULL) /* More addresses still to be sent */
2847 { /* in this run of the transport */
2848 continue_sequence++; /* Causes * in logging */
2849 goto SEND_MESSAGE;
2850 }
2851 if (continue_more) return yield; /* More addresses for another run */
2852
2853 /* Pass the socket to a new Exim process. Before doing so, we must shut
2854 down TLS. Not all MTAs allow for the continuation of the SMTP session
2855 when TLS is shut down. We test for this by sending a new EHLO. If we
2856 don't get a good response, we don't attempt to pass the socket on. */
2857
a7538db1 2858#ifdef SUPPORT_TLS
817d9f57 2859 if (tls_out.active >= 0)
0756eb3c 2860 {
817d9f57 2861 tls_close(FALSE, TRUE);
061b7ebd
PP		 2862 if (smtps)
2863 ok = FALSE;
2864 else
2865 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2866 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2867 ob->command_timeout);
0756eb3c 2868 }
a7538db1 2869#endif
0756eb3c
PH		 2870
2871 /* If the socket is successfully passed, we musn't send QUIT (or
2872 indeed anything!) from here. */
2873
895fbaf2
JH		 2874/*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2875propagate it from the initial
2876*/
0756eb3c
PH		 2877 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2878 new_message_id, inblock.sock))
2879 {
2880 send_quit = FALSE;
2881 }
2882 }
2883
2884 /* If RSET failed and there are addresses left, they get deferred. */
2885
895fbaf2
JH		 2886 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2887#ifdef EXPERIMENTAL_DSN_INFO
2888 , smtp_greeting, helo_response
2889#endif
2890 );
0756eb3c
PH		 2891 }
2892 }
2893
2894/* End off tidily with QUIT unless the connection has died or the socket has
2895been passed to another process. There has been discussion on the net about what
2896to do after sending QUIT. The wording of the RFC suggests that it is necessary
2897to wait for a response, but on the other hand, there isn't anything one can do
2898with an error response, other than log it. Exim used to do that. However,
2899further discussion suggested that it is positively advantageous not to wait for
2900the response, but to close the session immediately. This is supposed to move
2901the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2902load from the server. (Hosts that are both servers and clients may not see much
2903difference, of course.) Further discussion indicated that this was safe to do
2904on Unix systems which have decent implementations of TCP/IP that leave the
2905connection around for a while (TIME_WAIT) after the application has gone away.
2906This enables the response sent by the server to be properly ACKed rather than
2907timed out, as can happen on broken TCP/IP implementations on other OS.
2908
2909This change is being made on 31-Jul-98. After over a year of trouble-free
2910operation, the old commented-out code was removed on 17-Sep-99. */
2911
2912SEND_QUIT:
2913if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2914
2915END_OFF:
2916
2917#ifdef SUPPORT_TLS
817d9f57 2918tls_close(FALSE, TRUE);
0756eb3c
PH		 2919#endif
2920
2921/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH		 2922works because the NULL setting is passed back to the calling process, and
2923remote_max_parallel is forced to 1 when delivering over an existing connection,
2924
2925If all went well and continue_more is set, we shouldn't actually get here if
2926there are further addresses, as the return above will be taken. However,
2927writing RSET might have failed, or there may be other addresses whose hosts are
2928specified in the transports, and therefore not visible at top level, in which
2929case continue_more won't get set. */
2930
f1e894f3 2931(void)close(inblock.sock);
a7538db1 2932
774ef2d7
JH		 2933#ifdef EXPERIMENTAL_EVENT
2934(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH		 2935#endif
2936
0756eb3c
PH		 2937continue_transport = NULL;
2938continue_hostname = NULL;
2939return yield;
2940}
2941
2942
2943
2944
2945/*************************************************
2946* Closedown entry point *
2947*************************************************/
2948
2949/* This function is called when exim is passed an open smtp channel
2950from another incarnation, but the message which it has been asked
2951to deliver no longer exists. The channel is on stdin.
2952
2953We might do fancy things like looking for another message to send down
2954the channel, but if the one we sought has gone, it has probably been
2955delivered by some other process that itself will seek further messages,
2956so just close down our connection.
2957
2958Argument: pointer to the transport instance block
2959Returns: nothing
2960*/
2961
2962void
2963smtp_transport_closedown(transport_instance *tblock)
2964{
2965smtp_transport_options_block *ob =
2966 (smtp_transport_options_block *)(tblock->options_block);
2967smtp_inblock inblock;
2968smtp_outblock outblock;
2969uschar buffer[256];
2970uschar inbuffer[4096];
2971uschar outbuffer[16];
2972
2973inblock.sock = fileno(stdin);
2974inblock.buffer = inbuffer;
2975inblock.buffersize = sizeof(inbuffer);
2976inblock.ptr = inbuffer;
2977inblock.ptrend = inbuffer;
2978
2979outblock.sock = inblock.sock;
2980outblock.buffersize = sizeof(outbuffer);
2981outblock.buffer = outbuffer;
2982outblock.ptr = outbuffer;
2983outblock.cmd_count = 0;
2984outblock.authenticating = FALSE;
2985
2986(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2987(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2988 ob->command_timeout);
f1e894f3 2989(void)close(inblock.sock);
0756eb3c
PH		 2990}
2991
2992
2993
2994/*************************************************
2995* Prepare addresses for delivery *
2996*************************************************/
2997
2998/* This function is called to flush out error settings from previous delivery
2999attempts to other hosts. It also records whether we got here via an MX record
3000or not in the more_errno field of the address. We are interested only in
3001addresses that are still marked DEFER - others may have got delivered to a
3002previously considered IP address. Set their status to PENDING_DEFER to indicate
3003which ones are relevant this time.
3004
3005Arguments:
3006 addrlist the list of addresses
3007 host the host we are delivering to
3008
3009Returns: the first address for this delivery
3010*/
3011
3012static address_item *
3013prepare_addresses(address_item *addrlist, host_item *host)
3014{
3015address_item *first_addr = NULL;
3016address_item *addr;
3017for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH		 3018 if (addr->transport_return == DEFER)
3019 {
3020 if (first_addr == NULL) first_addr = addr;
3021 addr->transport_return = PENDING_DEFER;
3022 addr->basic_errno = 0;
3023 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3024 addr->message = NULL;
a7538db1 3025#ifdef SUPPORT_TLS
168dec3b
JH		 3026 addr->cipher = NULL;
3027 addr->ourcert = NULL;
3028 addr->peercert = NULL;
3029 addr->peerdn = NULL;
3030 addr->ocsp = OCSP_NOT_REQ;
895fbaf2
JH		 3031#endif
3032#ifdef EXPERIMENTAL_DSN_INFO
3033 addr->smtp_greeting = NULL;
3034 addr->helo_response = NULL;
a7538db1 3035#endif
168dec3b 3036 }
0756eb3c
PH		 3037return first_addr;
3038}
3039
3040
3041
3042/*************************************************
3043* Main entry point *
3044*************************************************/
3045
3046/* See local README for interface details. As this is a remote transport, it is
3047given a chain of addresses to be delivered in one connection, if possible. It
3048always returns TRUE, indicating that each address has its own independent
3049status set, except if there is a setting up problem, in which case it returns
3050FALSE. */
3051
3052BOOL
3053smtp_transport_entry(
3054 transport_instance *tblock, /* data for this instantiation */
3055 address_item *addrlist) /* addresses we are working on */
3056{
3057int cutoff_retry;
3058int port;
3059int hosts_defer = 0;
3060int hosts_fail = 0;
3061int hosts_looked_up = 0;
3062int hosts_retry = 0;
3063int hosts_serial = 0;
3064int hosts_total = 0;
8e669ac1 3065int total_hosts_tried = 0;
0756eb3c
PH		 3066address_item *addr;
3067BOOL expired = TRUE;
3068BOOL continuing = continue_hostname != NULL;
3069uschar *expanded_hosts = NULL;
3070uschar *pistring;
3071uschar *tid = string_sprintf("%s transport", tblock->name);
3072smtp_transport_options_block *ob =
3073 (smtp_transport_options_block *)(tblock->options_block);
3074host_item *hostlist = addrlist->host_list;
3075host_item *host = NULL;
3076
3077DEBUG(D_transport)
3078 {
3079 debug_printf("%s transport entered\n", tblock->name);
3080 for (addr = addrlist; addr != NULL; addr = addr->next)
3081 debug_printf(" %s\n", addr->address);
3082 if (continuing) debug_printf("already connected to %s [%s]\n",
3083 continue_hostname, continue_host_address);
3084 }
3085
f6c332bd
PH		 3086/* Set the flag requesting that these hosts be added to the waiting
3087database if the delivery fails temporarily or if we are running with
3088queue_smtp or a 2-stage queue run. This gets unset for certain
3089kinds of error, typically those that are specific to the message. */
3090
3091update_waiting = TRUE;
3092
0756eb3c
PH		 3093/* If a host list is not defined for the addresses - they must all have the
3094same one in order to be passed to a single transport - or if the transport has
3095a host list with hosts_override set, use the host list supplied with the
3096transport. It is an error for this not to exist. */
3097
3098if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3099 {
3100 if (ob->hosts == NULL)
3101 {
3102 addrlist->message = string_sprintf("%s transport called with no hosts set",
3103 tblock->name);
3104 addrlist->transport_return = PANIC;
3105 return FALSE; /* Only top address has status */
3106 }
3107
3108 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3109 ob->hosts);
3110
3111 /* If the transport's host list contains no '$' characters, and we are not
3112 randomizing, it is fixed and therefore a chain of hosts can be built once
3113 and for all, and remembered for subsequent use by other calls to this
3114 transport. If, on the other hand, the host list does contain '$', or we are
3115 randomizing its order, we have to rebuild it each time. In the fixed case,
3116 as the hosts string will never be used again, it doesn't matter that we
3117 replace all the : characters with zeros. */
3118
3119 if (ob->hostlist == NULL)
3120 {
3121 uschar *s = ob->hosts;
3122
3123 if (Ustrchr(s, '$') != NULL)
3124 {
d427a7f9 3125 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH		 3126 {
3127 addrlist->message = string_sprintf("failed to expand list of hosts "
3128 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3129 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3130 return FALSE; /* Only top address has status */
3131 }
3132 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3133 "\"%s\"\n", s, expanded_hosts);
3134 s = expanded_hosts;
3135 }
3136 else
3137 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3138
3139 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3140
e276e04b
TF		 3141 /* Check that the expansion yielded something useful. */
3142 if (hostlist == NULL)
3143 {
3144 addrlist->message =
3145 string_sprintf("%s transport has empty hosts setting", tblock->name);
3146 addrlist->transport_return = PANIC;
3147 return FALSE; /* Only top address has status */
3148 }
3149
0756eb3c
PH		 3150 /* If there was no expansion of hosts, save the host list for
3151 next time. */
3152
d427a7f9 3153 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH		 3154 }
3155
3156 /* This is not the first time this transport has been run in this delivery;
3157 the host list was built previously. */
3158
55414b25
JH		 3159 else
3160 hostlist = ob->hostlist;
0756eb3c
PH		 3161 }
3162
3163/* The host list was supplied with the address. If hosts_randomize is set, we
3164must sort it into a random order if it did not come from MX records and has not
3165already been randomized (but don't bother if continuing down an existing
3166connection). */
3167
3168else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3169 {
3170 host_item *newlist = NULL;
3171 while (hostlist != NULL)
3172 {
3173 host_item *h = hostlist;
3174 hostlist = hostlist->next;
3175
3176 h->sort_key = random_number(100);
3177
3178 if (newlist == NULL)
3179 {
3180 h->next = NULL;
3181 newlist = h;
3182 }
3183 else if (h->sort_key < newlist->sort_key)
3184 {
3185 h->next = newlist;
3186 newlist = h;
3187 }
3188 else
3189 {
3190 host_item *hh = newlist;
3191 while (hh->next != NULL)
3192 {
3193 if (h->sort_key < hh->next->sort_key) break;
3194 hh = hh->next;
3195 }
3196 h->next = hh->next;
3197 hh->next = h;
3198 }
3199 }
3200
3201 hostlist = addrlist->host_list = newlist;
3202 }
3203
2d280592 3204/* Sort out the default port. */
0756eb3c
PH		 3205
3206if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 3207
0756eb3c
PH		 3208/* For each host-plus-IP-address on the list:
3209
3210. If this is a continued delivery and the host isn't the one with the
3211 current connection, skip.
3212
3213. If the status is unusable (i.e. previously failed or retry checked), skip.
3214
3215. If no IP address set, get the address, either by turning the name into
3216 an address, calling gethostbyname if gethostbyname is on, or by calling
3217 the DNS. The DNS may yield multiple addresses, in which case insert the
3218 extra ones into the list.
3219
3220. Get the retry data if not previously obtained for this address and set the
3221 field which remembers the state of this address. Skip if the retry time is
3222 not reached. If not, remember whether retry data was found. The retry string
3223 contains both the name and the IP address.
3224
3225. Scan the list of addresses and mark those whose status is DEFER as
3226 PENDING_DEFER. These are the only ones that will be processed in this cycle
3227 of the hosts loop.
3228
3229. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3230 Some addresses may be successfully delivered, others may fail, and yet
3231 others may get temporary errors and so get marked DEFER.
3232
3233. The return from the delivery attempt is OK if a connection was made and a
3234 valid SMTP dialogue was completed. Otherwise it is DEFER.
3235
3236. If OK, add a "remove" retry item for this host/IPaddress, if any.
3237
3238. If fail to connect, or other defer state, add a retry item.
3239
3240. If there are any addresses whose status is still DEFER, carry on to the
3241 next host/IPaddress, unless we have tried the number of hosts given
533244af 3242 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH		 3243 there is some fancy logic for hosts_max_try that means its limit can be
3244 overstepped in some circumstances.
0756eb3c
PH		 3245
3246If we get to the end of the list, all hosts have deferred at least one address,
3247or not reached their retry times. If delay_after_cutoff is unset, it requests a
3248delivery attempt to those hosts whose last try was before the arrival time of
3249the current message. To cope with this, we have to go round the loop a second
3250time. After that, set the status and error data for any addresses that haven't
3251had it set already. */
3252
3253for (cutoff_retry = 0; expired &&
3254 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3255 cutoff_retry++)
3256 {
3257 host_item *nexthost = NULL;
3258 int unexpired_hosts_tried = 0;
3259
3260 for (host = hostlist;
8e669ac1 3261 host != NULL &&
533244af
PH		 3262 unexpired_hosts_tried < ob->hosts_max_try &&
3263 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH		 3264 host = nexthost)
3265 {
3266 int rc;
3267 int host_af;
3268 uschar *rs;
3269 BOOL serialized = FALSE;
3270 BOOL host_is_expired = FALSE;
3271 BOOL message_defer = FALSE;
0756eb3c
PH		 3272 BOOL some_deferred = FALSE;
3273 address_item *first_addr = NULL;
3274 uschar *interface = NULL;
3275 uschar *retry_host_key = NULL;
3276 uschar *retry_message_key = NULL;
3277 uschar *serialize_key = NULL;
3278
9c4e8f60
PH		 3279 /* Default next host is next host. :-) But this can vary if the
3280 hosts_max_try limit is hit (see below). It may also be reset if a host
3281 address is looked up here (in case the host was multihomed). */
3282
3283 nexthost = host->next;
3284
0756eb3c
PH		 3285 /* If the address hasn't yet been obtained from the host name, look it up
3286 now, unless the host is already marked as unusable. If it is marked as
3287 unusable, it means that the router was unable to find its IP address (in
3288 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3289 the lookup failed last time. We don't get this far if *all* MX records
3290 point to non-existent hosts; that is treated as a hard error.
3291
3292 We can just skip this host entirely. When the hosts came from the router,
3293 the address will timeout based on the other host(s); when the address is
3294 looked up below, there is an explicit retry record added.
3295
3296 Note that we mustn't skip unusable hosts if the address is not unset; they
3297 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3298
3299 if (host->address == NULL)
3300 {
322050c2 3301 int new_port, flags;
7cd1141b 3302 host_item *hh;
0756eb3c
PH		 3303
3304 if (host->status >= hstatus_unusable)
3305 {
3306 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3307 host->name);
3308 continue;
3309 }
3310
3311 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3312
7cd1141b
PH		 3313 /* The host name is permitted to have an attached port. Find it, and
3314 strip it from the name. Just remember it for now. */
3315
3316 new_port = host_item_get_port(host);
3317
3318 /* Count hosts looked up */
3319
0756eb3c
PH		 3320 hosts_looked_up++;
3321
3322 /* Find by name if so configured, or if it's an IP address. We don't
3323 just copy the IP address, because we need the test-for-local to happen. */
3324
322050c2
PH		 3325 flags = HOST_FIND_BY_A;
3326 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3327 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3328
7e66e54d 3329 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3330 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3331 else
0756eb3c 3332 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 3333 &ob->dnssec, /* domains for request/require */
55414b25 3334 NULL, NULL);
0756eb3c 3335
7cd1141b
PH		 3336 /* Update the host (and any additional blocks, resulting from
3337 multihoming) with a host-specific port, if any. */
3338
3339 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3340
0756eb3c
PH		 3341 /* Failure to find the host at this time (usually DNS temporary failure)
3342 is really a kind of routing failure rather than a transport failure.
3343 Therefore we add a retry item of the routing kind, not to stop us trying
3344 to look this name up here again, but to ensure the address gets timed
3345 out if the failures go on long enough. A complete failure at this point
3346 commonly points to a configuration error, but the best action is still
3347 to carry on for the next host. */
3348
3349 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3350 {
3351 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3352 expired = FALSE;
3353 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3354 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3355 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3356 host->status = hstatus_unusable;
3357
3358 for (addr = addrlist; addr != NULL; addr = addr->next)
3359 {
3360 if (addr->transport_return != DEFER) continue;
3361 addr->basic_errno = ERRNO_UNKNOWNHOST;
3362 addr->message =
3363 string_sprintf("failed to lookup IP address for %s", host->name);
3364 }
3365 continue;
3366 }
3367
3368 /* If the host is actually the local host, we may have a problem, or
3369 there may be some cunning configuration going on. In the problem case,
3370 log things and give up. The default transport status is already DEFER. */
3371
3372 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3373 {
3374 for (addr = addrlist; addr != NULL; addr = addr->next)
3375 {
3376 addr->basic_errno = 0;
3377 addr->message = string_sprintf("%s transport found host %s to be "
3378 "local", tblock->name, host->name);
3379 }
3380 goto END_TRANSPORT;
3381 }
3382 } /* End of block for IP address lookup */
3383
3384 /* If this is a continued delivery, we are interested only in the host
3385 which matches the name of the existing open channel. The check is put
3386 here after the local host lookup, in case the name gets expanded as a
3387 result of the lookup. Set expired FALSE, to save the outer loop executing
3388 twice. */
3389
3390 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3391 Ustrcmp(continue_host_address, host->address) != 0))
3392 {
3393 expired = FALSE;
3394 continue; /* With next host */
3395 }
3396
9c4e8f60
PH		 3397 /* Reset the default next host in case a multihomed host whose addresses
3398 are not looked up till just above added to the host list. */
83364d30
PH		 3399
3400 nexthost = host->next;
3401
0756eb3c
PH		 3402 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3403 domain is in queue_smtp_domains, we don't actually want to attempt any
3404 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3405 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3406 were not in it. We don't want to hold up all SMTP deliveries! Except when
3407 doing a two-stage queue run, don't do this if forcing. */
3408
3409 if ((!deliver_force || queue_2stage) && (queue_smtp ||
55414b25
JH		 3410 match_isinlist(addrlist->domain,
3411 (const uschar **)&queue_smtp_domains, 0,
cf39cf57 3412 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH		 3413 {
3414 expired = FALSE;
3415 for (addr = addrlist; addr != NULL; addr = addr->next)
3416 {
3417 if (addr->transport_return != DEFER) continue;
3418 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3419 }
3420 continue; /* With next host */
3421 }
3422
3423 /* Count hosts being considered - purely for an intelligent comment
3424 if none are usable. */
3425
3426 hosts_total++;
3427
3428 /* Set $host and $host address now in case they are needed for the
3429 interface expansion or the serialize_hosts check; they remain set if an
3430 actual delivery happens. */
3431
3432 deliver_host = host->name;
3433 deliver_host_address = host->address;
783b385f
JH		 3434 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3435 : host->dnssec == DS_NO ? US"no"
3436 : US"";
0756eb3c 3437
7cd1141b
PH		 3438 /* Set up a string for adding to the retry key if the port number is not
3439 the standard SMTP port. A host may have its own port setting that overrides
3440 the default. */
3441
3442 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3443 port : host->port);
3444 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3445
0756eb3c 3446 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
6f6dedcc
JH		 3447 string is set, even if constant (as different transports can have different
3448 constant settings), we must add it to the key that is used for retries,
3449 because connections to the same host from a different interface should be
3450 treated separately. */
0756eb3c
PH		 3451
3452 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
6f6dedcc
JH		 3453 if ((rs = ob->interface) && *rs)
3454 {
3455 if (!smtp_get_interface(rs, host_af, addrlist, &interface, tid))
3456 return FALSE;
3457 pistring = string_sprintf("%s/%s", pistring, interface);
3458 }
0756eb3c
PH		 3459
3460 /* The first time round the outer loop, check the status of the host by
3461 inspecting the retry data. The second time round, we are interested only
3462 in expired hosts that haven't been tried since this message arrived. */
3463
3464 if (cutoff_retry == 0)
3465 {
9c695f6d 3466 BOOL incl_ip;
0756eb3c 3467 /* Ensure the status of the address is set by checking retry data if
9c695f6d 3468 necessary. There may be host-specific retry data (applicable to all
0756eb3c
PH		 3469 messages) and also data for retries of a specific message at this host.
3470 If either of these retry records are actually read, the keys used are
3471 returned to save recomputing them later. */
3472
9c695f6d
JH		 3473 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3474 US"retry_include_ip_address", ob->retry_include_ip_address,
3475 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3476 continue; /* with next host */
3477
0756eb3c 3478 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
9c695f6d 3479 incl_ip, &retry_host_key, &retry_message_key);
0756eb3c
PH		 3480
3481 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3482 (host->address == NULL)? US"" : host->address, pistring,
3483 (host->status == hstatus_usable)? "usable" :
3484 (host->status == hstatus_unusable)? "unusable" :
3485 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3486
3487 /* Skip this address if not usable at this time, noting if it wasn't
3488 actually expired, both locally and in the address. */
3489
3490 switch (host->status)
3491 {
3492 case hstatus_unusable:
3493 expired = FALSE;
3494 setflag(addrlist, af_retry_skipped);
3495 /* Fall through */
3496
3497 case hstatus_unusable_expired:
3498 switch (host->why)
3499 {
3500 case hwhy_retry: hosts_retry++; break;
3501 case hwhy_failed: hosts_fail++; break;
3502 case hwhy_deferred: hosts_defer++; break;
3503 }
3504
3505 /* If there was a retry message key, implying that previously there
3506 was a message-specific defer, we don't want to update the list of
f6c332bd 3507 messages waiting for these hosts. */
0756eb3c 3508
f6c332bd 3509 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH		 3510 continue; /* With the next host or IP address */
3511 }
3512 }
3513
3514 /* Second time round the loop: if the address is set but expired, and
3515 the message is newer than the last try, let it through. */
3516
3517 else
3518 {
3519 if (host->address == NULL ||
3520 host->status != hstatus_unusable_expired ||
3521 host->last_try > received_time)
3522 continue;
3523 DEBUG(D_transport)
3524 debug_printf("trying expired host %s [%s]%s\n",
3525 host->name, host->address, pistring);
3526 host_is_expired = TRUE;
3527 }
3528
3529 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3530 it remains TRUE only if all hosts are expired and none are actually tried.
3531 */
3532
3533 expired = FALSE;
3534
3535 /* If this host is listed as one to which access must be serialized,
3536 see if another Exim process has a connection to it, and if so, skip
3537 this host. If not, update the database to record our connection to it
3538 and remember this for later deletion. Do not do any of this if we are
3539 sending the message down a pre-existing connection. */
3540
3541 if (!continuing &&
5130845b 3542 verify_check_given_host(&ob->serialize_hosts, host) == OK)
0756eb3c
PH		 3543 {
3544 serialize_key = string_sprintf("host-serialize-%s", host->name);
e8ae7214 3545 if (!enq_start(serialize_key, 1))
0756eb3c
PH		 3546 {
3547 DEBUG(D_transport)
3548 debug_printf("skipping host %s because another Exim process "
3549 "is connected to it\n", host->name);
3550 hosts_serial++;
3551 continue;
3552 }
3553 serialized = TRUE;
3554 }
3555
3556 /* OK, we have an IP address that is not waiting for its retry time to
3557 arrive (it might be expired) OR (second time round the loop) we have an
3558 expired host that hasn't been tried since the message arrived. Have a go
3559 at delivering the message to it. First prepare the addresses by flushing
3560 out the result of previous attempts, and finding the first address that
3561 is still to be delivered. */
3562
3563 first_addr = prepare_addresses(addrlist, host);
3564
3565 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3566 message_id, host->name, host->address, addrlist->address,
3567 (addrlist->next == NULL)? "" : ", ...");
3568
3569 set_process_info("delivering %s to %s [%s] (%s%s)",
3570 message_id, host->name, host->address, addrlist->address,
3571 (addrlist->next == NULL)? "" : ", ...");
3572
3573 /* This is not for real; don't do the delivery. If there are
3574 any remaining hosts, list them. */
3575
3576 if (dont_deliver)
3577 {
3578 host_item *host2;
895fbaf2 3579 set_errno_nohost(addrlist, 0, NULL, OK, FALSE);
0756eb3c
PH		 3580 for (addr = addrlist; addr != NULL; addr = addr->next)
3581 {
3582 addr->host_used = host;
3583 addr->special_action = '*';
3584 addr->message = US"delivery bypassed by -N option";
3585 }
3586 DEBUG(D_transport)
3587 {
3588 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3589 "*** host and remaining hosts:\n", tblock->name);
3590 for (host2 = host; host2 != NULL; host2 = host2->next)
3591 debug_printf(" %s [%s]\n", host2->name,
3592 (host2->address == NULL)? US"unset" : host2->address);
3593 }
3594 rc = OK;
3595 }
3596
3597 /* This is for real. If the host is expired, we don't count it for
3598 hosts_max_retry. This ensures that all hosts must expire before an address
8e669ac1 3599 is timed out, unless hosts_max_try_hardlimit (which protects against
533244af 3600 lunatic DNS configurations) is reached.
8e669ac1 3601
533244af
PH		 3602 If the host is not expired and we are about to hit the hosts_max_retry
3603 limit, check to see if there is a subsequent hosts with a different MX
3604 value. If so, make that the next host, and don't count this one. This is a
3605 heuristic to make sure that different MXs do get tried. With a normal kind
3606 of retry rule, they would get tried anyway when the earlier hosts were
3607 delayed, but if the domain has a "retry every time" type of rule - as is
3608 often used for the the very large ISPs, that won't happen. */
0756eb3c
PH		 3609
3610 else
3611 {
d427a7f9
JH		 3612 host_item * thost;
3613 /* Make a copy of the host if it is local to this invocation
3614 of the transport. */
3615
3616 if (expanded_hosts)
3617 {
3618 thost = store_get(sizeof(host_item));
3619 *thost = *host;
3620 thost->name = string_copy(host->name);
3621 thost->address = string_copy(host->address);
3622 }
3623 else
3624 thost = host;
3625
0756eb3c
PH		 3626 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3627 {
3628 host_item *h;
3629 DEBUG(D_transport)
3630 debug_printf("hosts_max_try limit reached with this host\n");
1a47b633
JH		 3631 for (h = host; h; h = h->next) if (h->mx != host->mx)
3632 {
3633 nexthost = h;
3634 unexpired_hosts_tried--;
3635 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3636 "and will be tried\n");
3637 break;
3638 }
0756eb3c
PH		 3639 }
3640
3641 /* Attempt the delivery. */
3642
533244af 3643 total_hosts_tried++;
d427a7f9
JH		 3644 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3645 &message_defer, FALSE);
0756eb3c
PH		 3646
3647 /* Yield is one of:
3648 OK => connection made, each address contains its result;
3649 message_defer is set for message-specific defers (when all
3650 recipients are marked defer)
3651 DEFER => there was a non-message-specific delivery problem;
3652 ERROR => there was a problem setting up the arguments for a filter,
3653 or there was a problem with expanding added headers
3654 */
3655
3656 /* If the result is not OK, there was a non-message-specific problem.
3657 If the result is DEFER, we need to write to the logs saying what happened
3658 for this particular host, except in the case of authentication and TLS
3659 failures, where the log has already been written. If all hosts defer a
3660 general message is written at the end. */
3661
3662 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3663 first_addr->basic_errno != ERRNO_TLSFAILURE)
3664 write_logs(first_addr, host);
3665
774ef2d7 3666#ifdef EXPERIMENTAL_EVENT
d68218c7 3667 if (rc == DEFER)
774ef2d7 3668 deferred_event_raise(first_addr, host);
a7538db1 3669#endif
d68218c7 3670
0756eb3c
PH		 3671 /* If STARTTLS was accepted, but there was a failure in setting up the
3672 TLS session (usually a certificate screwup), and the host is not in
3673 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3674 TLS forcibly turned off. We have to start from scratch with a new SMTP
3675 connection. That's why the retry is done from here, not from within
3676 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3677 session, so the in-clear transmission after those errors, if permitted,
3678 happens inside smtp_deliver().] */
3679
a7538db1 3680#ifdef SUPPORT_TLS
7a31d643
JH		 3681 if ( rc == DEFER
3682 && first_addr->basic_errno == ERRNO_TLSFAILURE
3683 && ob->tls_tempfail_tryclear
5130845b 3684 && verify_check_given_host(&ob->hosts_require_tls, host) != OK
7a31d643 3685 )
0756eb3c
PH		 3686 {
3687 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3688 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3689 first_addr = prepare_addresses(addrlist, host);
d427a7f9
JH		 3690 rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock,
3691 &message_defer, TRUE);
0756eb3c
PH		 3692 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3693 write_logs(first_addr, host);
774ef2d7 3694# ifdef EXPERIMENTAL_EVENT
d68218c7 3695 if (rc == DEFER)
774ef2d7 3696 deferred_event_raise(first_addr, host);
a7538db1 3697# endif
0756eb3c 3698 }
a1bccd48 3699#endif /*SUPPORT_TLS*/
0756eb3c
PH		 3700 }
3701
3702 /* Delivery attempt finished */
3703
3704 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3705 US"ERROR" : US"?";
3706
3707 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3708 message_id, host->name, host->address, addrlist->address,
3709 (addrlist->next == NULL)? "" : " (& others)", rs);
3710
3711 /* Release serialization if set up */
3712
3713 if (serialized) enq_end(serialize_key);
3714
3715 /* If the result is DEFER, or if a host retry record is known to exist, we
3716 need to add an item to the retry chain for updating the retry database
3717 at the end of delivery. We only need to add the item to the top address,
3718 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3719 for any other delivery attempts using the same address. (It is copied into
3720 the unusable tree at the outer level, so even if different address blocks
3721 contain the same address, it still won't get tried again.) */
3722
3723 if (rc == DEFER || retry_host_key != NULL)
3724 {
3725 int delete_flag = (rc != DEFER)? rf_delete : 0;
3726 if (retry_host_key == NULL)
3727 {
9c695f6d
JH		 3728 BOOL incl_ip;
3729 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3730 US"retry_include_ip_address", ob->retry_include_ip_address,
3731 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3732 incl_ip = TRUE; /* error; use most-specific retry record */
3733
3734 retry_host_key = incl_ip ?
0756eb3c
PH		 3735 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3736 string_sprintf("T:%S%s", host->name, pistring);
3737 }
3738
3739 /* If a delivery of another message over an existing SMTP connection
3740 yields DEFER, we do NOT set up retry data for the host. This covers the
3741 case when there are delays in routing the addresses in the second message
3742 that are so long that the server times out. This is alleviated by not
3743 routing addresses that previously had routing defers when handling an
3744 existing connection, but even so, this case may occur (e.g. if a
3745 previously happily routed address starts giving routing defers). If the
3746 host is genuinely down, another non-continued message delivery will
3747 notice it soon enough. */
3748
3749 if (delete_flag != 0 || !continuing)
3750 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3751
3752 /* We may have tried an expired host, if its retry time has come; ensure
3753 the status reflects the expiry for the benefit of any other addresses. */
3754
3755 if (rc == DEFER)
3756 {
3757 host->status = (host_is_expired)?
3758 hstatus_unusable_expired : hstatus_unusable;
3759 host->why = hwhy_deferred;
3760 }
3761 }
3762
3763 /* If message_defer is set (host was OK, but every recipient got deferred
3764 because of some message-specific problem), or if that had happened
3765 previously so that a message retry key exists, add an appropriate item
3766 to the retry chain. Note that if there was a message defer but now there is
3767 a host defer, the message defer record gets deleted. That seems perfectly
3768 reasonable. Also, stop the message from being remembered as waiting
f6c332bd 3769 for specific hosts. */
0756eb3c
PH		 3770
3771 if (message_defer || retry_message_key != NULL)
3772 {
3773 int delete_flag = message_defer? 0 : rf_delete;
3774 if (retry_message_key == NULL)
3775 {
9c695f6d
JH		 3776 BOOL incl_ip;
3777 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3778 US"retry_include_ip_address", ob->retry_include_ip_address,
3779 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3780 incl_ip = TRUE; /* error; use most-specific retry record */
3781
3782 retry_message_key = incl_ip ?
0756eb3c
PH		 3783 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3784 message_id) :
3785 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3786 }
3787 retry_add_item(addrlist, retry_message_key,
3788 rf_message | rf_host | delete_flag);
f6c332bd 3789 update_waiting = FALSE;
0756eb3c
PH		 3790 }
3791
3792 /* Any return other than DEFER (that is, OK or ERROR) means that the
3793 addresses have got their final statuses filled in for this host. In the OK
3794 case, see if any of them are deferred. */
3795
3796 if (rc == OK)
4cea764f 3797 for (addr = addrlist; addr; addr = addr->next)
0756eb3c
PH		 3798 if (addr->transport_return == DEFER)
3799 {
3800 some_deferred = TRUE;
3801 break;
3802 }
0756eb3c
PH		 3803
3804 /* If no addresses deferred or the result was ERROR, return. We do this for
3805 ERROR because a failing filter set-up or add_headers expansion is likely to
3806 fail for any host we try. */
3807
3808 if (rc == ERROR || (rc == OK && !some_deferred))
3809 {
3810 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3811 return TRUE; /* Each address has its status */
3812 }
3813
3814 /* If the result was DEFER or some individual addresses deferred, let
3815 the loop run to try other hosts with the deferred addresses, except for the
3816 case when we were trying to deliver down an existing channel and failed.
3817 Don't try any other hosts in this case. */
3818
3819 if (continuing) break;
3820
3821 /* If the whole delivery, or some individual addresses, were deferred and
3822 there are more hosts that could be tried, do not count this host towards
3823 the hosts_max_try limit if the age of the message is greater than the
3824 maximum retry time for this host. This means we may try try all hosts,
3825 ignoring the limit, when messages have been around for some time. This is
3826 important because if we don't try all hosts, the address will never time
533244af 3827 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
0756eb3c
PH		 3828
3829 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3830 {
3831 BOOL timedout;
3832 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3833
3834 if (retry != NULL && retry->rules != NULL)
3835 {
3836 retry_rule *last_rule;
3837 for (last_rule = retry->rules;
3838 last_rule->next != NULL;
3839 last_rule = last_rule->next);
3840 timedout = time(NULL) - received_time > last_rule->timeout;
3841 }
3842 else timedout = TRUE; /* No rule => timed out */
3843
3844 if (timedout)
3845 {
3846 unexpired_hosts_tried--;
3847 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3848 "hosts_max_try (message older than host's retry time)\n");
3849 }
3850 }
3851 } /* End of loop for trying multiple hosts. */
3852
3853 /* This is the end of the loop that repeats iff expired is TRUE and
3854 ob->delay_after_cutoff is FALSE. The second time round we will
3855 try those hosts that haven't been tried since the message arrived. */
3856
3857 DEBUG(D_transport)
3858 {
3859 debug_printf("all IP addresses skipped or deferred at least one address\n");
3860 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3861 debug_printf("retrying IP addresses not tried since message arrived\n");
3862 }
3863 }
3864
3865
3866/* Get here if all IP addresses are skipped or defer at least one address. In
3867MUA wrapper mode, this will happen only for connection or other non-message-
3868specific failures. Force the delivery status for all addresses to FAIL. */
3869
3870if (mua_wrapper)
3871 {
3872 for (addr = addrlist; addr != NULL; addr = addr->next)
3873 addr->transport_return = FAIL;
3874 goto END_TRANSPORT;
3875 }
3876
3877/* In the normal, non-wrapper case, add a standard message to each deferred
3878address if there hasn't been an error, that is, if it hasn't actually been
3879tried this time. The variable "expired" will be FALSE if any deliveries were
3880actually tried, or if there was at least one host that was not expired. That
3881is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3882a delivery has been tried, an error code will be set, and the failing of the
3883message is handled by the retry code later.
3884
3885If queue_smtp is set, or this transport was called to send a subsequent message
3886down an existing TCP/IP connection, and something caused the host not to be
3887found, we end up here, but can detect these cases and handle them specially. */
3888
3889for (addr = addrlist; addr != NULL; addr = addr->next)
3890 {
3891 /* If host is not NULL, it means that we stopped processing the host list
533244af
PH		 3892 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3893 means we need to behave as if some hosts were skipped because their retry
3894 time had not come. Specifically, this prevents the address from timing out.
8e669ac1 3895 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
533244af 3896 hosts were tried. */
0756eb3c
PH		 3897
3898 if (host != NULL)
3899 {
533244af
PH		 3900 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3901 {
3902 DEBUG(D_transport)
3903 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3904 "hosts were tried\n");
3905 }
3906 else
8e669ac1 3907 {
533244af
PH		 3908 DEBUG(D_transport)
3909 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3910 setflag(addr, af_retry_skipped);
8e669ac1 3911 }
0756eb3c
PH		 3912 }
3913
3914 if (queue_smtp) /* no deliveries attempted */
3915 {
3916 addr->transport_return = DEFER;
3917 addr->basic_errno = 0;
3918 addr->message = US"SMTP delivery explicitly queued";
3919 }
3920
3921 else if (addr->transport_return == DEFER &&
3922 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3923 addr->message == NULL)
3924 {
3925 addr->basic_errno = ERRNO_HRETRY;
3926 if (continue_hostname != NULL)
3927 {
3928 addr->message = US"no host found for existing SMTP connection";
3929 }
3930 else if (expired)
3931 {
fffffe4c 3932 setflag(addr, af_pass_message); /* This is not a security risk */
0756eb3c
PH		 3933 addr->message = (ob->delay_after_cutoff)?
3934 US"retry time not reached for any host after a long failure period" :
3935 US"all hosts have been failing for a long time and were last tried "
3936 "after this message arrived";
3937
3938 /* If we are already using fallback hosts, or there are no fallback hosts
3939 defined, convert the result to FAIL to cause a bounce. */
3940
3941 if (addr->host_list == addr->fallback_hosts ||
3942 addr->fallback_hosts == NULL)
3943 addr->transport_return = FAIL;
3944 }
3945 else
3946 {
3947 if (hosts_retry == hosts_total)
3948 addr->message = US"retry time not reached for any host";
3949 else if (hosts_fail == hosts_total)
3950 addr->message = US"all host address lookups failed permanently";
3951 else if (hosts_defer == hosts_total)
3952 addr->message = US"all host address lookups failed temporarily";
3953 else if (hosts_serial == hosts_total)
3954 addr->message = US"connection limit reached for all hosts";
3955 else if (hosts_fail+hosts_defer == hosts_total)
3956 addr->message = US"all host address lookups failed";
3957 else addr->message = US"some host address lookups failed and retry time "
3958 "not reached for other hosts or connection limit reached";
3959 }
3960 }
3961 }
3962
3963/* Update the database which keeps information about which messages are waiting
f6c332bd
PH		 3964for which hosts to become available. For some message-specific errors, the
3965update_waiting flag is turned off because we don't want follow-on deliveries in
ea722490 3966those cases. If this transport instance is explicitly limited to one message
8b260705
PP		 3967per connection then follow-on deliveries are not possible and there's no need
3968to create/update the per-transport wait-<transport_name> database. */
0756eb3c 3969
ea722490
JH		 3970if (update_waiting && tblock->connection_max_messages != 1)
3971 transport_update_waiting(hostlist, tblock->name);
0756eb3c
PH		 3972
3973END_TRANSPORT:
3974
3975DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3976
3977return TRUE; /* Each address has its status */
3978}
3979
578897ea
JH		 3980/* vi: aw ai sw=2
3981*/
0756eb3c 3982/* End of transport/smtp.c */
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