TLS: Enable ECDHE on OpenSSL, just the NIST P-256 curve. Bug 1397
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
5a66c31b 5/* Copyright (c) University of Cambridge 1995 - 2014 */
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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[] = {
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22 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
23 (void *)offsetof(transport_instance, expand_multi_domain) },
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24 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
25 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
26
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27 { "address_retry_include_sender", opt_bool,
28 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
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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) },
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33 { "authenticated_sender_force", opt_bool,
34 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
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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
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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
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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) },
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67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
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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. */
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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
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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) },
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92 { "hosts_avoid_pipelining", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 94#ifdef SUPPORT_TLS
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95 { "hosts_avoid_tls", opt_stringptr,
96 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 97#endif
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98 { "hosts_max_try", opt_int,
99 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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100 { "hosts_max_try_hardlimit", opt_int,
101 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 102#ifdef SUPPORT_TLS
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103 { "hosts_nopass_tls", opt_stringptr,
104 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 105#endif
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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)
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111 { "hosts_request_ocsp", opt_stringptr,
112 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
113#endif
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114 { "hosts_require_auth", opt_stringptr,
115 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 116#ifdef SUPPORT_TLS
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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
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122 { "hosts_require_ocsp", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
124# endif
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125 { "hosts_require_tls", opt_stringptr,
126 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 127#endif
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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)
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131 { "hosts_try_dane", opt_stringptr,
132 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
133#endif
8ccd00b1 134#ifndef DISABLE_PRDR
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135 { "hosts_try_prdr", opt_stringptr,
136 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
137#endif
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138#ifdef SUPPORT_TLS
139 { "hosts_verify_avoid_tls", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
141#endif
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142 { "interface", opt_stringptr,
143 (void *)offsetof(smtp_transport_options_block, interface) },
144 { "keepalive", opt_bool,
145 (void *)offsetof(smtp_transport_options_block, keepalive) },
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146 { "lmtp_ignore_quota", opt_bool,
147 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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148 { "max_rcpt", opt_int | opt_public,
149 (void *)offsetof(transport_instance, max_addresses) },
506900af 150 { "multi_domain", opt_expand_bool | opt_public,
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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,
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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) }
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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
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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) },
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171 { "tls_dh_min_bits", opt_int,
172 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
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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) },
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177 { "tls_sni", opt_stringptr,
178 (void *)offsetof(smtp_transport_options_block, tls_sni) },
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179 { "tls_tempfail_tryclear", opt_bool,
180 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
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181 { "tls_try_verify_hosts", opt_stringptr,
182 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
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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,
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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
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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 */
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211 NULL, /* serialize_hosts */
212 NULL, /* hosts_try_auth */
213 NULL, /* hosts_require_auth */
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214#ifdef EXPERIMENTAL_DANE
215 NULL, /* hosts_try_dane */
7a31d643 216 NULL, /* hosts_require_dane */
96e47838 217#endif
8ccd00b1 218#ifndef DISABLE_PRDR
ad07e9ad 219 US"*", /* hosts_try_prdr */
fd98a5c6 220#endif
f2de3a33 221#ifndef DISABLE_OCSP
0e66b3b6 222 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
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223 NULL, /* hosts_require_ocsp */
224#endif
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225 NULL, /* hosts_require_tls */
226 NULL, /* hosts_avoid_tls */
6c9ed72e 227 NULL, /* hosts_verify_avoid_tls */
c51b8e75 228 NULL, /* hosts_avoid_pipelining */
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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 */
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241 FALSE, /* gethostbyname */
242 TRUE, /* dns_qualify_single */
243 FALSE, /* dns_search_parents */
0539a19d 244 { NULL, NULL }, /* dnssec_domains {request,require} */
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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
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256 ,NULL, /* tls_certificate */
257 NULL, /* tls_crl */
258 NULL, /* tls_privatekey */
259 NULL, /* tls_require_ciphers */
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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 */
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265 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
266 /* tls_dh_min_bits */
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267 TRUE, /* tls_tempfail_tryclear */
268 NULL, /* tls_verify_hosts */
610ff438 269 US"*", /* tls_try_verify_hosts */
01a4a5c5 270 US"*" /* tls_verify_cert_hostnames */
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271#endif
272#ifndef DISABLE_DKIM
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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
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280};
281
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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" };
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288
289
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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 */
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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.
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306 (2) To pass back the interface, port, protocol, and other options, for use
307 during callout verification.
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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
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313 uid the uid that will be set (not used)
314 gid the gid that will be set (not used)
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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)
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323{
324smtp_transport_options_block *ob =
325 (smtp_transport_options_block *)(tblock->options_block);
326
327errmsg = errmsg; /* Keep picky compilers happy */
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328uid = uid;
329gid = gid;
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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;
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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)
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389 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
390 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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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
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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
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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:
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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
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443
444If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
445the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
446this particular type of timeout.
447
448Returns: nothing
449*/
450
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451static void
452set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
c562fd30 453 BOOL pass_message, host_item * host)
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454{
455address_item *addr;
456int orvalue = 0;
457if (errno_value == ERRNO_CONNECTTIMEOUT)
458 {
459 errno_value = ETIMEDOUT;
460 orvalue = RTEF_CTOUT;
461 }
462for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b 463 if (addr->transport_return >= PENDING)
447d236c 464 {
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465 addr->basic_errno = errno_value;
466 addr->more_errno |= orvalue;
467 if (msg != NULL)
468 {
469 addr->message = msg;
470 if (pass_message) setflag(addr, af_pass_message);
471 }
472 addr->transport_return = rc;
473 if (host)
474 addr->host_used = host;
447d236c 475 }
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476}
477
478
479
480/*************************************************
481* Check an SMTP response *
482*************************************************/
483
484/* This function is given an errno code and the SMTP response buffer
485to analyse, together with the host identification for generating messages. It
486sets an appropriate message and puts the first digit of the response code into
487the yield variable. If no response was actually read, a suitable digit is
488chosen.
489
490Arguments:
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491 host the current host, to get its name for messages
492 errno_value pointer to the errno value
493 more_errno from the top address for use with ERRNO_FILTER_FAIL
494 buffer the SMTP response buffer
495 yield where to put a one-digit SMTP response code
496 message where to put an errror message
497 pass_message set TRUE if message is an SMTP response
498
499Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
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500*/
501
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502static BOOL
503check_response(host_item *host, int *errno_value, int more_errno,
447d236c 504 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
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505{
506uschar *pl = US"";
507
508if (smtp_use_pipelining &&
509 (Ustrcmp(smtp_command, "MAIL") == 0 ||
510 Ustrcmp(smtp_command, "RCPT") == 0 ||
511 Ustrcmp(smtp_command, "DATA") == 0))
512 pl = US"pipelined ";
513
514*yield = '4'; /* Default setting is to give a temporary error */
515
516/* Handle response timeout */
517
518if (*errno_value == ETIMEDOUT)
519 {
c562fd30
JH
520 *message = US string_sprintf("SMTP timeout after %s%s",
521 pl, smtp_command);
0756eb3c
PH
522 if (transport_count > 0)
523 *message = US string_sprintf("%s (%d bytes written)", *message,
524 transport_count);
525 return FALSE;
526 }
527
528/* Handle malformed SMTP response */
529
530if (*errno_value == ERRNO_SMTPFORMAT)
531 {
55414b25 532 const uschar *malfresp = string_printing(buffer);
0756eb3c 533 while (isspace(*malfresp)) malfresp++;
c562fd30
JH
534 *message = *malfresp == 0
535 ? string_sprintf("Malformed SMTP reply (an empty line) "
536 "in response to %s%s", pl, smtp_command)
537 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
538 pl, smtp_command, malfresp);
0756eb3c
PH
539 return FALSE;
540 }
541
542/* Handle a failed filter process error; can't send QUIT as we mustn't
543end the DATA. */
544
545if (*errno_value == ERRNO_FILTER_FAIL)
546 {
35af9f61 547 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 548 more_errno,
35af9f61 549 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
550 return FALSE;
551 }
552
553/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
554end the DATA. */
555
556if (*errno_value == ERRNO_CHHEADER_FAIL)
557 {
558 *message =
559 US string_sprintf("failed to expand headers_add or headers_remove: %s",
560 expand_string_message);
561 return FALSE;
562 }
563
564/* Handle failure to write a complete data block */
565
566if (*errno_value == ERRNO_WRITEINCOMPLETE)
567 {
568 *message = US string_sprintf("failed to write a data block");
569 return FALSE;
570 }
571
250b6871
JH
572#ifdef EXPERIMENTAL_INTERNATIONAL
573/* Handle lack of advertised SMTPUTF8, for international message */
574if (*errno_value == ERRNO_UTF8_FWD)
575 {
f358d5e0 576 *message = US string_sprintf("utf8 support required but not offered for forwarding");
250b6871
JH
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
578 return TRUE;
579 }
580#endif
581
0756eb3c
PH
582/* Handle error responses from the remote mailer. */
583
584if (buffer[0] != 0)
585 {
55414b25 586 const uschar *s = string_printing(buffer);
447d236c 587 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 588 "%s", pl, smtp_command, s);
447d236c 589 *pass_message = TRUE;
0756eb3c
PH
590 *yield = buffer[0];
591 return TRUE;
592 }
593
594/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
595connection closed) case, which causes deferral. An explicit connection reset
596error has the same effect. Otherwise, put the host's identity in the message,
597leaving the errno value to be interpreted as well. In all cases, we have to
598assume the connection is now dead. */
0756eb3c 599
19b9dc85 600if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
601 {
602 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH
603 *message = US string_sprintf("Remote host closed connection "
604 "in response to %s%s", pl, smtp_command);
0756eb3c
PH
605 }
606else *message = US string_sprintf("%s [%s]", host->name, host->address);
607
608return FALSE;
609}
610
611
612
613/*************************************************
614* Write error message to logs *
615*************************************************/
616
617/* This writes to the main log and to the message log.
618
619Arguments:
620 addr the address item containing error information
621 host the current host
622
623Returns: nothing
624*/
625
626static void
627write_logs(address_item *addr, host_item *host)
628{
c562fd30
JH
629uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
630
631if (addr->message)
0756eb3c 632 {
c562fd30 633 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
634 if (addr->basic_errno > 0)
635 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
636 log_write(0, LOG_MAIN, "%s", message);
637 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
638 }
639else
640 {
c562fd30
JH
641 if (log_extra_selector & LX_outgoing_port)
642 message = string_sprintf("%s:%d", message,
643 host->port == PORT_NONE ? 25 : host->port);
644 log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno));
645 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message,
646 strerror(addr->basic_errno));
0756eb3c
PH
647 }
648}
649
c562fd30
JH
650static void
651msglog_line(host_item * host, uschar * message)
652{
653 deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
655}
656
0756eb3c
PH
657
658
774ef2d7 659#ifdef EXPERIMENTAL_EVENT
d68218c7
JH
660/*************************************************
661* Post-defer action *
662*************************************************/
663
664/* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
666
667Arguments:
d68218c7
JH
668 addr the address item containing error information
669 host the current host
670
671Returns: nothing
672*/
673
674static void
774ef2d7 675deferred_event_raise(address_item *addr, host_item *host)
d68218c7 676{
774ef2d7 677uschar * action = addr->transport->event_action;
55414b25 678const uschar * save_domain;
a7538db1
JH
679uschar * save_local;
680
d68218c7 681if (!action)
a7538db1 682 return;
d68218c7 683
a7538db1
JH
684save_domain = deliver_domain;
685save_local = deliver_localpart;
686
687/*XXX would ip & port already be set up? */
688deliver_host_address = string_copy(host->address);
774ef2d7
JH
689deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690event_defer_errno = addr->basic_errno;
d68218c7
JH
691
692router_name = addr->router->name;
693transport_name = addr->transport->name;
a7538db1
JH
694deliver_domain = addr->domain;
695deliver_localpart = addr->local_part;
696
774ef2d7 697(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
698 addr->message
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
704 : NULL);
705
706deliver_localpart = save_local;
707deliver_domain = save_domain;
d68218c7
JH
708router_name = transport_name = NULL;
709}
710#endif
711
0756eb3c
PH
712/*************************************************
713* Synchronize SMTP responses *
714*************************************************/
715
716/* This function is called from smtp_deliver() to receive SMTP responses from
717the server, and match them up with the commands to which they relate. When
718PIPELINING is not in use, this function is called after every command, and is
719therefore somewhat over-engineered, but it is simpler to use a single scheme
720that works both with and without PIPELINING instead of having two separate sets
721of code.
722
723The set of commands that are buffered up with pipelining may start with MAIL
724and may end with DATA; in between are RCPT commands that correspond to the
725addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726etc.) are never buffered.
727
728Errors after MAIL or DATA abort the whole process leaving the response in the
729buffer. After MAIL, pending responses are flushed, and the original command is
730re-instated in big_buffer for error messages. For RCPT commands, the remote is
731permitted to reject some recipient addresses while accepting others. However
732certain errors clearly abort the whole process. Set the value in
733transport_return to PENDING_OK if the address is accepted. If there is a
734subsequent general error, it will get reset accordingly. If not, it will get
735converted to OK at the end.
736
737Arguments:
48c7f9e2
PH
738 addrlist the complete address list
739 include_affixes TRUE if affixes include in RCPT
740 sync_addr ptr to the ptr of the one to start scanning at (updated)
741 host the host we are connected to
742 count the number of responses to read
743 address_retry_
744 include_sender true if 4xx retry is to include the sender it its key
745 pending_MAIL true if the first response is for MAIL
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
749 inblock incoming SMTP block
750 timeout timeout value
751 buffer buffer for reading response
752 buffsize size of buffer
0756eb3c
PH
753
754Returns: 3 if at least one address had 2xx and one had 5xx
755 2 if at least one address had 5xx but none had 2xx
756 1 if at least one host had a 2xx response, but none had 5xx
757 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
758 -1 timeout while reading RCPT response
759 -2 I/O or other non-response error for RCPT
760 -3 DATA or MAIL failed - errno and buffer set
761*/
762
763static int
764sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
765 address_item **sync_addr, host_item *host, int count,
766 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
767 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
768 int buffsize)
769{
770address_item *addr = *sync_addr;
771int yield = 0;
772
773/* Handle the response for a MAIL command. On error, reinstate the original
774command in big_buffer for error message use, and flush any further pending
775responses before returning, except after I/O errors and timeouts. */
776
777if (pending_MAIL)
778 {
779 count--;
780 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
781 {
782 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
783 if (errno == 0 && buffer[0] != 0)
784 {
785 uschar flushbuffer[4096];
e97957bc
PH
786 int save_errno = 0;
787 if (buffer[0] == '4')
788 {
789 save_errno = ERRNO_MAIL4XX;
790 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
791 }
0756eb3c
PH
792 while (count-- > 0)
793 {
794 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
795 '2', timeout)
796 && (errno != 0 || flushbuffer[0] == 0))
797 break;
798 }
e97957bc 799 errno = save_errno;
0756eb3c 800 }
c562fd30
JH
801
802 if (pending_DATA) count--; /* Number of RCPT responses to come */
803 while (count-- > 0) /* Mark any pending addrs with the host used */
804 {
805 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
806 addr->host_used = host;
807 addr = addr->next;
808 }
0756eb3c
PH
809 return -3;
810 }
811 }
812
813if (pending_DATA) count--; /* Number of RCPT responses to come */
814
815/* Read and handle the required number of RCPT responses, matching each one up
816with an address by scanning for the next address whose status is PENDING_DEFER.
817*/
818
819while (count-- > 0)
820 {
821 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
822
823 /* The address was accepted */
c562fd30 824 addr->host_used = host;
0756eb3c
PH
825
826 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
827 {
828 yield |= 1;
829 addr->transport_return = PENDING_OK;
830
831 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
832 ensure that any address-specific retry record is expunged. We do this both
833 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
834
835 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
836 {
837 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
838 sender_address);
839 retry_add_item(addr, altkey, rf_delete);
0756eb3c 840 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 841 }
0756eb3c
PH
842 }
843
844 /* Timeout while reading the response */
845
846 else if (errno == ETIMEDOUT)
847 {
c562fd30
JH
848 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
849 transport_rcpt_address(addr, include_affixes));
168dec3b 850 set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL);
0756eb3c 851 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 852 update_waiting = FALSE;
0756eb3c
PH
853 return -1;
854 }
855
856 /* Handle other errors in obtaining an SMTP response by returning -1. This
857 will cause all the addresses to be deferred. Restore the SMTP command in
858 big_buffer for which we are checking the response, so the error message
859 makes sense. */
860
861 else if (errno != 0 || buffer[0] == 0)
862 {
863 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
864 transport_rcpt_address(addr, include_affixes));
865 return -2;
866 }
867
868 /* Handle SMTP permanent and temporary response codes. */
869
870 else
871 {
872 addr->message =
447d236c 873 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH
874 "%s", transport_rcpt_address(addr, include_affixes),
875 string_printing(buffer));
447d236c 876 setflag(addr, af_pass_message);
c562fd30 877 msglog_line(host, addr->message);
0756eb3c
PH
878
879 /* The response was 5xx */
880
881 if (buffer[0] == '5')
882 {
883 addr->transport_return = FAIL;
884 yield |= 2;
885 }
886
887 /* The response was 4xx */
888
889 else
890 {
0756eb3c
PH
891 addr->transport_return = DEFER;
892 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 893 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 894
c562fd30
JH
895 /* Log temporary errors if there are more hosts to be tried.
896 If not, log this last one in the == line. */
0756eb3c 897
c562fd30
JH
898 if (host->next)
899 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 900
f6c332bd
PH
901 /* Do not put this message on the list of those waiting for specific
902 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 903
f6c332bd 904 update_waiting = FALSE;
0756eb3c 905
48c7f9e2
PH
906 /* Add a retry item for the address so that it doesn't get tried again
907 too soon. If address_retry_include_sender is true, add the sender address
908 to the retry key. */
0756eb3c 909
48c7f9e2
PH
910 if (address_retry_include_sender)
911 {
912 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
913 sender_address);
914 retry_add_item(addr, altkey, 0);
915 }
916 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
917 }
918 }
919 } /* Loop for next RCPT response */
920
921/* Update where to start at for the next block of responses, unless we
922have already handled all the addresses. */
923
924if (addr != NULL) *sync_addr = addr->next;
925
926/* Handle a response to DATA. If we have not had any good recipients, either
927previously or in this block, the response is ignored. */
928
929if (pending_DATA != 0 &&
930 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
931 {
932 int code;
933 uschar *msg;
447d236c 934 BOOL pass_message;
e97957bc
PH
935 if (pending_DATA > 0 || (yield & 1) != 0)
936 {
937 if (errno == 0 && buffer[0] == '4')
938 {
939 errno = ERRNO_DATA4XX;
940 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
941 }
942 return -3;
943 }
447d236c 944 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
945 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
946 "is in use and there were no good recipients\n", msg);
947 }
948
949/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
950present) received 3xx. If any RCPTs were handled and yielded anything other
951than 4xx, yield will be set non-zero. */
952
953return yield;
954}
955
956
957
fcc8e047
JH
958/* Do the client side of smtp-level authentication */
959/*
960Arguments:
961 buffer EHLO response from server (gets overwritten)
962 addrlist chain of potential addresses to deliver
963 host host to deliver to
964 ob transport options
965 ibp, obp comms channel control blocks
966
967Returns:
968 OK Success, or failed (but not required): global "smtp_authenticated" set
969 DEFER Failed authentication (and was required)
970 ERROR Internal problem
971
972 FAIL_SEND Failed communications - transmit
973 FAIL - response
974*/
975
976int
977smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
978 smtp_transport_options_block *ob, BOOL is_esmtp,
979 smtp_inblock *ibp, smtp_outblock *obp)
980{
a7538db1
JH
981int require_auth;
982uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 983
a7538db1
JH
984smtp_authenticated = FALSE;
985client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 986require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 987
a7538db1
JH
988if (is_esmtp && !regex_AUTH) regex_AUTH =
989 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
990 FALSE, TRUE);
fcc8e047 991
a7538db1
JH
992if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
993 {
994 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
995 expand_nmax = -1; /* reset */
fcc8e047 996
a7538db1
JH
997 /* Must not do this check until after we have saved the result of the
998 regex match above. */
fcc8e047 999
a7538db1 1000 if (require_auth == OK ||
5130845b 1001 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
1002 {
1003 auth_instance *au;
1004 fail_reason = US"no common mechanisms were found";
fcc8e047 1005
a7538db1 1006 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1007
a7538db1
JH
1008 /* Scan the configured authenticators looking for one which is configured
1009 for use as a client, which is not suppressed by client_condition, and
1010 whose name matches an authentication mechanism supported by the server.
1011 If one is found, attempt to authenticate by calling its client function.
1012 */
fcc8e047 1013
a7538db1
JH
1014 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1015 {
1016 uschar *p = names;
1017 if (!au->client ||
1018 (au->client_condition != NULL &&
1019 !expand_check_condition(au->client_condition, au->name,
1020 US"client authenticator")))
1021 {
1022 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1023 au->name,
1024 (au->client)? "client_condition is false" :
1025 "not configured as a client");
1026 continue;
1027 }
fcc8e047 1028
a7538db1 1029 /* Loop to scan supported server mechanisms */
fcc8e047 1030
a7538db1
JH
1031 while (*p != 0)
1032 {
1033 int rc;
1034 int len = Ustrlen(au->public_name);
1035 while (isspace(*p)) p++;
fcc8e047 1036
a7538db1
JH
1037 if (strncmpic(au->public_name, p, len) != 0 ||
1038 (p[len] != 0 && !isspace(p[len])))
1039 {
1040 while (*p != 0 && !isspace(*p)) p++;
1041 continue;
1042 }
fcc8e047 1043
a7538db1
JH
1044 /* Found data for a listed mechanism. Call its client entry. Set
1045 a flag in the outblock so that data is overwritten after sending so
1046 that reflections don't show it. */
fcc8e047 1047
a7538db1
JH
1048 fail_reason = US"authentication attempt(s) failed";
1049 obp->authenticating = TRUE;
1050 rc = (au->info->clientcode)(au, ibp, obp,
1051 ob->command_timeout, buffer, bufsize);
1052 obp->authenticating = FALSE;
1053 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1054 au->name, rc);
fcc8e047 1055
a7538db1
JH
1056 /* A temporary authentication failure must hold up delivery to
1057 this host. After a permanent authentication failure, we carry on
1058 to try other authentication methods. If all fail hard, try to
1059 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1060
a7538db1
JH
1061 switch(rc)
1062 {
1063 case OK:
1064 smtp_authenticated = TRUE; /* stops the outer loop */
1065 client_authenticator = au->name;
1066 if (au->set_client_id != NULL)
1067 client_authenticated_id = expand_string(au->set_client_id);
1068 break;
1069
1070 /* Failure after writing a command */
1071
1072 case FAIL_SEND:
1073 return FAIL_SEND;
1074
1075 /* Failure after reading a response */
1076
1077 case FAIL:
1078 if (errno != 0 || buffer[0] != '5') return FAIL;
1079 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1080 au->name, host->name, host->address, buffer);
1081 break;
1082
1083 /* Failure by some other means. In effect, the authenticator
1084 decided it wasn't prepared to handle this case. Typically this
1085 is the result of "fail" in an expansion string. Do we need to
1086 log anything here? Feb 2006: a message is now put in the buffer
1087 if logging is required. */
1088
1089 case CANCELLED:
1090 if (*buffer != 0)
1091 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1092 "authentication H=%s [%s] %s", au->name, host->name,
1093 host->address, buffer);
1094 break;
1095
1096 /* Internal problem, message in buffer. */
1097
1098 case ERROR:
168dec3b
JH
1099 set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1100 DEFER, FALSE, NULL);
a7538db1
JH
1101 return ERROR;
1102 }
fcc8e047 1103
a7538db1
JH
1104 break; /* If not authenticated, try next authenticator */
1105 } /* Loop for scanning supported server mechanisms */
1106 } /* Loop for further authenticators */
fcc8e047 1107 }
a7538db1 1108 }
fcc8e047 1109
a7538db1 1110/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1111
a7538db1
JH
1112if (require_auth == OK && !smtp_authenticated)
1113 {
1114 set_errno(addrlist, ERRNO_AUTHFAIL,
1115 string_sprintf("authentication required but %s", fail_reason), DEFER,
c562fd30 1116 FALSE, NULL);
a7538db1
JH
1117 return DEFER;
1118 }
4d8d62b9 1119
a7538db1 1120return OK;
fcc8e047
JH
1121}
1122
1123
1124/* Construct AUTH appendix string for MAIL TO */
1125/*
1126Arguments
1127 buffer to build string
1128 addrlist chain of potential addresses to deliver
1129 ob transport options
1130
1131Globals smtp_authenticated
1132 client_authenticated_sender
1133Return True on error, otherwise buffer has (possibly empty) terminated string
1134*/
1135
1136BOOL
1137smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1138 smtp_transport_options_block *ob)
1139{
1140uschar *local_authenticated_sender = authenticated_sender;
1141
1142#ifdef notdef
1143 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1144#endif
1145
1146if (ob->authenticated_sender != NULL)
1147 {
1148 uschar *new = expand_string(ob->authenticated_sender);
1149 if (new == NULL)
1150 {
1151 if (!expand_string_forcedfail)
1152 {
1153 uschar *message = string_sprintf("failed to expand "
1154 "authenticated_sender: %s", expand_string_message);
168dec3b 1155 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
fcc8e047
JH
1156 return TRUE;
1157 }
1158 }
1159 else if (new[0] != 0) local_authenticated_sender = new;
1160 }
1161
1162/* Add the authenticated sender address if present */
1163
1164if ((smtp_authenticated || ob->authenticated_sender_force) &&
1165 local_authenticated_sender != NULL)
1166 {
1167 string_format(buffer, bufsize, " AUTH=%s",
1168 auth_xtextencode(local_authenticated_sender,
1169 Ustrlen(local_authenticated_sender)));
1170 client_authenticated_sender = string_copy(local_authenticated_sender);
1171 }
1172else
1173 *buffer= 0;
1174
1175return FALSE;
1176}
1177
1178
1179
0e66b3b6
JH
1180#ifdef EXPERIMENTAL_DANE
1181int
b8b1b5cb 1182tlsa_lookup(const host_item * host, dns_answer * dnsa,
0e66b3b6
JH
1183 BOOL dane_required, BOOL * dane)
1184{
1185/* move this out to host.c given the similarity to dns_lookup() ? */
1186uschar buffer[300];
55414b25 1187const uschar * fullname = buffer;
0e66b3b6
JH
1188
1189/* TLSA lookup string */
1190(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1191
1192switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1193 {
1194 case DNS_AGAIN:
1195 return DEFER; /* just defer this TLS'd conn */
1196
1197 default:
1198 case DNS_FAIL:
1199 if (dane_required)
0e66b3b6 1200 return FAIL;
0e66b3b6
JH
1201 break;
1202
1203 case DNS_SUCCEED:
1204 if (!dns_is_secure(dnsa))
1205 {
1206 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1207 return DEFER;
1208 }
1209 *dane = TRUE;
1210 break;
1211 }
1212return OK;
1213}
1214#endif
1215
1216
a39bd74d
JB
1217
1218typedef struct smtp_compare_s
1219{
1220 uschar *current_sender_address;
1221 struct transport_instance *tblock;
1222} smtp_compare_t;
1223
1224/*
1225Create a unique string that identifies this message, it is based on
1226sender_address, helo_data and tls_certificate if enabled. */
1227
1228static uschar *
1229smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1230{
1231address_item * addr1;
1232uschar * if1 = US"";
1233uschar * helo1 = US"";
1234#ifdef SUPPORT_TLS
1235uschar * tlsc1 = US"";
1236#endif
1237uschar * save_sender_address = sender_address;
1238uschar * local_identity = NULL;
1239smtp_transport_options_block * ob =
1240 (smtp_transport_options_block *)tblock->options_block;
1241
1242sender_address = sender;
1243
1244addr1 = deliver_make_addr (sender, TRUE);
1245deliver_set_expansions(addr1);
1246
1247if (ob->interface)
1248 if1 = expand_string(ob->interface);
1249
1250if (ob->helo_data)
1251 helo1 = expand_string(ob->helo_data);
1252
1253#ifdef SUPPORT_TLS
1254if (ob->tls_certificate)
1255 tlsc1 = expand_string(ob->tls_certificate);
1256local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1257#else
1258local_identity = string_sprintf ("%s^%s", if1, helo1);
1259#endif
1260
1261deliver_set_expansions(NULL);
1262sender_address = save_sender_address;
1263
1264return local_identity;
1265}
1266
1267
1268
1269/* This routine is a callback that is called from transport_check_waiting.
1270This function will evaluate the incoming message versus the previous
1271message. If the incoming message is using a different local identity then
1272we will veto this new message. */
1273
1274static BOOL
1275smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1276{
1277uschar * save_sender_address = sender_address;
1278uschar * current_local_identity =
1279 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
1280uschar * new_sender_address = deliver_get_sender_address(message_id);
1281uschar * message_local_identity =
1282 smtp_local_identity(new_sender_address, s_compare->tblock);
1283
1284sender_address = save_sender_address;
1285
1286return Ustrcmp(current_local_identity, message_local_identity) == 0;
1287}
1288
1289
1290
0756eb3c
PH
1291/*************************************************
1292* Deliver address list to given host *
1293*************************************************/
1294
1295/* If continue_hostname is not null, we get here only when continuing to
1296deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1297input. TLS is never active on a passed channel; the previous process always
1298closes it down before passing the connection on.
0756eb3c
PH
1299
1300Otherwise, we have to make a connection to the remote host, and do the
1301initial protocol exchange.
1302
1303When running as an MUA wrapper, if the sender or any recipient is rejected,
1304temporarily or permanently, we force failure for all recipients.
1305
1306Arguments:
1307 addrlist chain of potential addresses to deliver; only those whose
1308 transport_return field is set to PENDING_DEFER are currently
1309 being processed; others should be skipped - they have either
1310 been delivered to an earlier host or IP address, or been
1311 failed by one of them.
1312 host host to deliver to
1313 host_af AF_INET or AF_INET6
2d280592 1314 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1315 interface interface to bind to, or NULL
1316 tblock transport instance block
0756eb3c
PH
1317 message_defer set TRUE if yield is OK, but all addresses were deferred
1318 because of a non-recipient, non-host failure, that is, a
1319 4xx response to MAIL FROM, DATA, or ".". This is a defer
1320 that is specific to the message.
1321 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1322 a second attempt after TLS initialization fails
1323
1324Returns: OK - the connection was made and the delivery attempted;
1325 the result for each address is in its data block.
1326 DEFER - the connection could not be made, or something failed
1327 while setting up the SMTP session, or there was a
1328 non-message-specific error, such as a timeout.
1329 ERROR - a filter command is specified for this transport,
1330 and there was a problem setting it up; OR helo_data
1331 or add_headers or authenticated_sender is specified
1332 for this transport, and the string failed to expand
1333*/
1334
1335static int
1336smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1337 uschar *interface, transport_instance *tblock,
0756eb3c
PH
1338 BOOL *message_defer, BOOL suppress_tls)
1339{
1340address_item *addr;
1341address_item *sync_addr;
1342address_item *first_addr = addrlist;
1343int yield = OK;
1344int address_count;
1345int save_errno;
1346int rc;
1347time_t start_delivery_time = time(NULL);
1348smtp_transport_options_block *ob =
1349 (smtp_transport_options_block *)(tblock->options_block);
1350BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1351BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1352BOOL ok = FALSE;
1353BOOL send_rset = TRUE;
1354BOOL send_quit = TRUE;
1355BOOL setting_up = TRUE;
1356BOOL completed_address = FALSE;
1357BOOL esmtp = TRUE;
1358BOOL pending_MAIL;
447d236c 1359BOOL pass_message = FALSE;
8ccd00b1 1360#ifndef DISABLE_PRDR
fd98a5c6
JH
1361BOOL prdr_offered = FALSE;
1362BOOL prdr_active;
1363#endif
7ade712c 1364#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577 1365BOOL utf8_needed = FALSE;
7ade712c
JH
1366BOOL utf8_offered = FALSE;
1367#endif
6c1c3d1d 1368BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH
1369#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1370BOOL dane = FALSE;
0539a19d 1371BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH
1372dns_answer tlsa_dnsa;
1373#endif
0756eb3c
PH
1374smtp_inblock inblock;
1375smtp_outblock outblock;
1376int max_rcpt = tblock->max_addresses;
f1513293 1377uschar *igquotstr = US"";
a39bd74d 1378
41c7c167 1379uschar *helo_data = NULL;
a39bd74d 1380
0756eb3c
PH
1381uschar *message = NULL;
1382uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1383uschar *p;
1384uschar buffer[4096];
1385uschar inbuffer[4096];
98470202 1386uschar outbuffer[4096];
0756eb3c
PH
1387
1388suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1389
1390*message_defer = FALSE;
1391smtp_command = US"initial connection";
1392if (max_rcpt == 0) max_rcpt = 999999;
1393
1394/* Set up the buffer for reading SMTP response packets. */
1395
1396inblock.buffer = inbuffer;
1397inblock.buffersize = sizeof(inbuffer);
1398inblock.ptr = inbuffer;
1399inblock.ptrend = inbuffer;
1400
1401/* Set up the buffer for holding SMTP commands while pipelining */
1402
1403outblock.buffer = outbuffer;
1404outblock.buffersize = sizeof(outbuffer);
1405outblock.ptr = outbuffer;
1406outblock.cmd_count = 0;
1407outblock.authenticating = FALSE;
1408
6c512171
PH
1409/* Reset the parameters of a TLS session. */
1410
817d9f57
JH
1411tls_out.bits = 0;
1412tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1413tls_out.ourcert = NULL;
1414tls_out.peercert = NULL;
817d9f57
JH
1415tls_out.peerdn = NULL;
1416#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1417tls_out.sni = NULL;
5b456975 1418#endif
018058b2 1419tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1420
35aba663
JH
1421/* Flip the legacy TLS-related variables over to the outbound set in case
1422they're used in the context of the transport. Don't bother resetting
1423afterward as we're in a subprocess. */
1424
1425tls_modify_variables(&tls_out);
1426
061b7ebd
PP
1427#ifndef SUPPORT_TLS
1428if (smtps)
1429 {
168dec3b
JH
1430 set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1431 DEFER, FALSE, NULL);
018058b2 1432 return ERROR;
061b7ebd
PP
1433 }
1434#endif
1435
0756eb3c
PH
1436/* Make a connection to the host if this isn't a continued delivery, and handle
1437the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1438specially so they can be identified for retries. */
1439
1440if (continue_hostname == NULL)
1441 {
a7538db1 1442 /* This puts port into host->port */
0756eb3c 1443 inblock.sock = outblock.sock =
7eb6c37c 1444 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1445
0756eb3c
PH
1446 if (inblock.sock < 0)
1447 {
1448 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
c562fd30 1449 NULL, DEFER, FALSE, NULL);
0756eb3c
PH
1450 return DEFER;
1451 }
1452
0e66b3b6
JH
1453#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1454 {
0e66b3b6
JH
1455 tls_out.dane_verified = FALSE;
1456 tls_out.tlsa_usage = 0;
1457
0e66b3b6
JH
1458 if (host->dnssec == DS_YES)
1459 {
bf7aabb4
JH
1460 if( ( dane_required
1461 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
1462 )
1463 && (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK
038597d2 1464 && dane_required /* do not error on only dane-requested */
0e66b3b6 1465 )
4cea764f
JH
1466 {
1467 set_errno(addrlist, ERRNO_DNSDEFER,
1468 string_sprintf("DANE error: tlsa lookup %s",
1469 rc == DEFER ? "DEFER" : "FAIL"),
1470 rc, FALSE, NULL);
038597d2 1471 return rc;
4cea764f 1472 }
0e66b3b6
JH
1473 }
1474 else if (dane_required)
1475 {
4cea764f
JH
1476 set_errno(addrlist, ERRNO_DNSDEFER,
1477 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
1478 FAIL, FALSE, NULL);
1479 return FAIL;
0e66b3b6
JH
1480 }
1481
1482 if (dane)
1483 ob->tls_tempfail_tryclear = FALSE;
1484 }
1485#endif /*DANE*/
1486
41c7c167
PH
1487 /* Expand the greeting message while waiting for the initial response. (Makes
1488 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1489 delayed till here so that $sending_interface and $sending_port are set. */
1490
1491 helo_data = expand_string(ob->helo_data);
810d16ad
JH
1492#ifdef EXPERIMENTAL_INTERNATIONAL
1493 if (helo_data)
1494 {
1495 uschar * errstr = NULL;
1496 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1497 {
1498 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
1499 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
1500 yield = DEFER;
1501 goto SEND_QUIT;
1502 }
1503 }
1504#endif
41c7c167 1505
0756eb3c
PH
1506 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1507 is nevertheless a reasonably clean way of programming this kind of logic,
1508 where you want to escape on any error. */
1509
061b7ebd
PP
1510 if (!smtps)
1511 {
1512 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1513 ob->command_timeout)) goto RESPONSE_FAILED;
0756eb3c 1514
774ef2d7 1515#ifdef EXPERIMENTAL_EVENT
b30275b8 1516 {
805c9d53
JH
1517 uschar * s;
1518 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1519 : host->dnssec==DS_NO ? US"no" : NULL;
1520 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1521 if (s)
a7538db1 1522 {
168dec3b 1523 set_errno(addrlist, ERRNO_EXPANDFAIL,
b30275b8
JH
1524 string_sprintf("deferred by smtp:connect event expansion: %s", s),
1525 DEFER, FALSE, NULL);
a7538db1
JH
1526 yield = DEFER;
1527 goto SEND_QUIT;
1528 }
b30275b8 1529 }
a7538db1
JH
1530#endif
1531
061b7ebd
PP
1532 /* Now check if the helo_data expansion went well, and sign off cleanly if
1533 it didn't. */
41c7c167 1534
061b7ebd
PP
1535 if (helo_data == NULL)
1536 {
1537 uschar *message = string_sprintf("failed to expand helo_data: %s",
1538 expand_string_message);
168dec3b 1539 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
061b7ebd
PP
1540 yield = DEFER;
1541 goto SEND_QUIT;
1542 }
41c7c167
PH
1543 }
1544
0756eb3c
PH
1545/** Debugging without sending a message
1546addrlist->transport_return = DEFER;
1547goto SEND_QUIT;
1548**/
1549
1550 /* Errors that occur after this point follow an SMTP command, which is
1551 left in big_buffer by smtp_write_command() for use in error messages. */
1552
1553 smtp_command = big_buffer;
1554
1555 /* Tell the remote who we are...
1556
1557 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1558 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1559 greeting is of this form. The assumption was that the far end supports it
1560 properly... but experience shows that there are some that give 5xx responses,
1561 even though the banner includes "ESMTP" (there's a bloody-minded one that
1562 says "ESMTP not spoken here"). Cope with that case.
1563
1564 September 2000: Time has passed, and it seems reasonable now to always send
1565 EHLO at the start. It is also convenient to make the change while installing
1566 the TLS stuff.
1567
1568 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1569 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1570 would be no way to send out the mails, so there is now a host list
1571 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1572 PIPELINING problem as well. Maybe it can also be useful to cure other
1573 problems with broken servers.
1574
1575 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1576 Then somebody tried it with a Microsoft mailer... It seems that all other
1577 mailers use upper case for some reason (the RFC is quite clear about case
1578 independence) so, for peace of mind, I gave in. */
1579
5130845b 1580 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1581
061b7ebd
PP
1582 /* Alas; be careful, since this goto is not an error-out, so conceivably
1583 we might set data between here and the target which we assume to exist
1584 and be usable. I can see this coming back to bite us. */
a7538db1 1585#ifdef SUPPORT_TLS
061b7ebd
PP
1586 if (smtps)
1587 {
1588 tls_offered = TRUE;
1589 suppress_tls = FALSE;
1590 ob->tls_tempfail_tryclear = FALSE;
1591 smtp_command = US"SSL-on-connect";
1592 goto TLS_NEGOTIATE;
1593 }
a7538db1 1594#endif
061b7ebd 1595
0756eb3c
PH
1596 if (esmtp)
1597 {
1598 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1599 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1600 goto SEND_FAILED;
1601 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1602 ob->command_timeout))
1603 {
1604 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1605 esmtp = FALSE;
1606 }
1607 }
1608 else
1609 {
1610 DEBUG(D_transport)
1611 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1612 }
1613
1614 if (!esmtp)
1615 {
1616 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1617 goto SEND_FAILED;
1618 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1619 ob->command_timeout)) goto RESPONSE_FAILED;
1620 }
1621
f1513293
PH
1622 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1623 lmtp_ignore_quota option was set. */
1624
1625 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1626 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1627 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1628
0756eb3c
PH
1629 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1630
a7538db1 1631#ifdef SUPPORT_TLS
0756eb3c
PH
1632 tls_offered = esmtp &&
1633 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1634 PCRE_EOPT, NULL, 0) >= 0;
a7538db1 1635#endif
fd98a5c6 1636
a7538db1 1637#ifndef DISABLE_PRDR
5130845b
JH
1638 prdr_offered = esmtp
1639 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1640 PCRE_EOPT, NULL, 0) >= 0
1641 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH
1642
1643 if (prdr_offered)
1644 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
a7538db1 1645#endif
7ade712c
JH
1646
1647#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577
JH
1648 if (addrlist->prop.utf8_msg)
1649 {
1650 utf8_needed = !addrlist->prop.utf8_downcvt
1651 && !addrlist->prop.utf8_downcvt_maybe;
1652 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
1653 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
1654
1655 utf8_offered = esmtp
1656 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1657 PCRE_EOPT, NULL, 0) >= 0;
1658 }
7ade712c 1659#endif
0756eb3c
PH
1660 }
1661
1662/* For continuing deliveries down the same channel, the socket is the standard
1663input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1664below). Set up the pointer to where subsequent commands will be left, for
1665error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1666set from the command line if they were set in the process that passed the
1667connection on. */
1668
1669else
1670 {
1671 inblock.sock = outblock.sock = fileno(stdin);
1672 smtp_command = big_buffer;
4311097e 1673 host->port = port; /* Record the port that was used */
0756eb3c
PH
1674 }
1675
1676/* If TLS is available on this connection, whether continued or not, attempt to
1677start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1678send another EHLO - the server may give a different answer in secure mode. We
1679use a separate buffer for reading the response to STARTTLS so that if it is
1680negative, the original EHLO data is available for subsequent analysis, should
1681the client not be required to use TLS. If the response is bad, copy the buffer
1682for error analysis. */
1683
1684#ifdef SUPPORT_TLS
5130845b
JH
1685if ( tls_offered
1686 && !suppress_tls
1687 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH
1688 {
1689 uschar buffer2[4096];
1690 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1691 goto SEND_FAILED;
1692
1693 /* If there is an I/O error, transmission of this message is deferred. If
1694 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1695 false, we also defer. However, if there is a temporary rejection of STARTTLS
1696 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1697 STARTTLS, we carry on. This means we will try to send the message in clear,
1698 unless the host is in hosts_require_tls (tested below). */
1699
1700 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1701 ob->command_timeout))
1702 {
0756eb3c
PH
1703 if (errno != 0 || buffer2[0] == 0 ||
1704 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK
1705 {
1706 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1707 goto RESPONSE_FAILED;
0dda4340 1708 }
0756eb3c
PH
1709 }
1710
1711 /* STARTTLS accepted: try to negotiate a TLS session. */
1712
1713 else
061b7ebd 1714 TLS_NEGOTIATE:
0756eb3c 1715 {
0e66b3b6
JH
1716 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1717# ifdef EXPERIMENTAL_DANE
1718 , dane ? &tlsa_dnsa : NULL
1719# endif
1720 );
0756eb3c
PH
1721
1722 /* TLS negotiation failed; give an error. From outside, this function may
1723 be called again to try in clear on a new connection, if the options permit
1724 it for this host. */
1725
1726 if (rc != OK)
1727 {
6ebd79ec
JH
1728# ifdef EXPERIMENTAL_DANE
1729 if (rc == DEFER && dane && !dane_required)
1730 {
1731 log_write(0, LOG_MAIN, "DANE attempt failed;"
1732 " trying CA-root TLS to %s [%s] (not in hosts_require_dane)",
1733 host->name, host->address);
1734 dane = FALSE;
1735 goto TLS_NEGOTIATE;
1736 }
1737# endif
1738
0756eb3c
PH
1739 save_errno = ERRNO_TLSFAILURE;
1740 message = US"failure while setting up TLS session";
1741 send_quit = FALSE;
1742 goto TLS_FAILED;
1743 }
1744
1745 /* TLS session is set up */
1746
1747 for (addr = addrlist; addr != NULL; addr = addr->next)
5ca2a9a1
PH
1748 if (addr->transport_return == PENDING_DEFER)
1749 {
817d9f57 1750 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1751 addr->ourcert = tls_out.ourcert;
1752 addr->peercert = tls_out.peercert;
817d9f57 1753 addr->peerdn = tls_out.peerdn;
018058b2 1754 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1755 }
0756eb3c
PH
1756 }
1757 }
1758
061b7ebd
PP
1759/* if smtps, we'll have smtp_command set to something else; always safe to
1760reset it here. */
1761smtp_command = big_buffer;
1762
41c7c167
PH
1763/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1764helo_data is null, we are dealing with a connection that was passed from
1765another process, and so we won't have expanded helo_data above. We have to
1766expand it here. $sending_ip_address and $sending_port are set up right at the
1767start of the Exim process (in exim.c). */
0756eb3c 1768
817d9f57 1769if (tls_out.active >= 0)
0756eb3c 1770 {
061b7ebd 1771 char *greeting_cmd;
41c7c167
PH
1772 if (helo_data == NULL)
1773 {
1774 helo_data = expand_string(ob->helo_data);
1775 if (helo_data == NULL)
1776 {
1777 uschar *message = string_sprintf("failed to expand helo_data: %s",
1778 expand_string_message);
168dec3b 1779 set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL);
41c7c167
PH
1780 yield = DEFER;
1781 goto SEND_QUIT;
1782 }
1783 }
1784
0d0e4455 1785 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1786 if (smtps)
1787 {
1788 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1789 ob->command_timeout)) goto RESPONSE_FAILED;
0d0e4455
PP
1790 }
1791
1792 if (esmtp)
1793 greeting_cmd = "EHLO";
1794 else
1795 {
1796 greeting_cmd = "HELO";
1797 DEBUG(D_transport)
1798 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1799 }
1800
1801 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1802 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c
PH
1803 goto SEND_FAILED;
1804 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1805 ob->command_timeout))
1806 goto RESPONSE_FAILED;
1807 }
1808
1809/* If the host is required to use a secure channel, ensure that we
1810have one. */
1811
0e66b3b6
JH
1812else if (
1813# ifdef EXPERIMENTAL_DANE
1814 dane ||
1815# endif
5130845b 1816 verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1817 )
0756eb3c
PH
1818 {
1819 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1820 message = string_sprintf("a TLS session is required, but %s",
0756eb3c
PH
1821 tls_offered? "an attempt to start TLS failed" :
1822 "the server did not offer TLS support");
1823 goto TLS_FAILED;
1824 }
0e66b3b6 1825#endif /*SUPPORT_TLS*/
0756eb3c
PH
1826
1827/* If TLS is active, we have just started it up and re-done the EHLO command,
1828so its response needs to be analyzed. If TLS is not active and this is a
1829continued session down a previously-used socket, we haven't just done EHLO, so
1830we skip this. */
1831
1832if (continue_hostname == NULL
a7538db1 1833#ifdef SUPPORT_TLS
817d9f57 1834 || tls_out.active >= 0
a7538db1 1835#endif
0756eb3c
PH
1836 )
1837 {
f1513293
PH
1838 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1839 lmtp_ignore_quota option was set. */
1840
1841 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1842 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1843 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1844
0756eb3c
PH
1845 /* If the response to EHLO specified support for the SIZE parameter, note
1846 this, provided size_addition is non-negative. */
1847
1848 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1849 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1850 PCRE_EOPT, NULL, 0) >= 0;
1851
1852 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1853 the current host, esmtp will be false, so PIPELINING can never be used. If
1854 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1855
5130845b
JH
1856 smtp_use_pipelining = esmtp
1857 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK
1858 && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1859 PCRE_EOPT, NULL, 0) >= 0;
0756eb3c
PH
1860
1861 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1862 smtp_use_pipelining? "" : "not ");
1863
8ccd00b1 1864#ifndef DISABLE_PRDR
5130845b
JH
1865 prdr_offered = esmtp
1866 && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
7ade712c 1867 PCRE_EOPT, NULL, 0) >= 0
5130845b 1868 && verify_check_given_host(&ob->hosts_try_prdr, host) == OK;
fd98a5c6
JH
1869
1870 if (prdr_offered)
1871 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1872#endif
1873
7ade712c 1874#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577
JH
1875 if (addrlist->prop.utf8_msg)
1876 utf8_offered = esmtp
1877 && pcre_exec(regex_UTF8, NULL, CS buffer, Ustrlen(buffer), 0,
1878 PCRE_EOPT, NULL, 0) >= 0;
7ade712c
JH
1879#endif
1880
6c1c3d1d 1881 /* Note if the server supports DSN */
7ade712c
JH
1882 smtp_use_dsn = esmtp
1883 && pcre_exec(regex_DSN, NULL, CS buffer, Ustrlen(CS buffer), 0,
1884 PCRE_EOPT, NULL, 0) >= 0;
6c1c3d1d 1885 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
6c1c3d1d 1886
0756eb3c
PH
1887 /* Note if the response to EHLO specifies support for the AUTH extension.
1888 If it has, check that this host is one we want to authenticate to, and do
1889 the business. The host name and address must be available when the
1890 authenticator's client driver is running. */
1891
fcc8e047
JH
1892 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1893 ob, esmtp, &inblock, &outblock))
0756eb3c 1894 {
fcc8e047
JH
1895 default: goto SEND_QUIT;
1896 case OK: break;
1897 case FAIL_SEND: goto SEND_FAILED;
1898 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
1899 }
1900 }
1901
1902/* The setting up of the SMTP call is now complete. Any subsequent errors are
1903message-specific. */
1904
1905setting_up = FALSE;
1906
7ade712c
JH
1907#ifdef EXPERIMENTAL_INTERNATIONAL
1908/* If this is an international message we need the host to speak SMTPUTF8 */
3c8b3577 1909if (utf8_needed && !utf8_offered)
7ade712c
JH
1910 {
1911 errno = ERRNO_UTF8_FWD;
1912 goto RESPONSE_FAILED;
1913 }
1914#endif
1915
0756eb3c
PH
1916/* If there is a filter command specified for this transport, we can now
1917set it up. This cannot be done until the identify of the host is known. */
1918
1919if (tblock->filter_command != NULL)
1920 {
1921 BOOL rc;
1922 uschar buffer[64];
1923 sprintf(CS buffer, "%.50s transport", tblock->name);
1924 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1925 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 1926 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
1927
1928 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1929 yield ERROR. */
1930
1931 if (!rc)
1932 {
447d236c 1933 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
c562fd30 1934 FALSE, NULL);
0756eb3c
PH
1935 yield = ERROR;
1936 goto SEND_QUIT;
1937 }
1938 }
1939
1940
1941/* For messages that have more than the maximum number of envelope recipients,
1942we want to send several transactions down the same SMTP connection. (See
1943comments in deliver.c as to how this reconciles, heuristically, with
1944remote_max_parallel.) This optimization was added to Exim after the following
1945code was already working. The simplest way to put it in without disturbing the
1946code was to use a goto to jump back to this point when there is another
1947transaction to handle. */
1948
1949SEND_MESSAGE:
1950sync_addr = first_addr;
1951address_count = 0;
1952ok = FALSE;
1953send_rset = TRUE;
1954completed_address = FALSE;
1955
1956
1957/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1958qualification, send it, adding something to the message size to allow for
1959imprecision and things that get added en route. Exim keeps the number of lines
1960in a message, so we can give an accurate value for the original message, but we
1961need some additional to handle added headers. (Double "." characters don't get
1962included in the count.) */
1963
1964p = buffer;
1965*p = 0;
1966
1967if (smtp_use_size)
1968 {
1969 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1970 while (*p) p++;
1971 }
1972
8ccd00b1 1973#ifndef DISABLE_PRDR
fd98a5c6
JH
1974prdr_active = FALSE;
1975if (prdr_offered)
1976 {
1977 for (addr = first_addr; addr; addr = addr->next)
1978 if (addr->transport_return == PENDING_DEFER)
1979 {
1980 for (addr = addr->next; addr; addr = addr->next)
1981 if (addr->transport_return == PENDING_DEFER)
1982 { /* at least two recipients to send */
1983 prdr_active = TRUE;
1984 sprintf(CS p, " PRDR"); p += 5;
a7538db1 1985 break;
fd98a5c6
JH
1986 }
1987 break;
1988 }
1989 }
fd98a5c6
JH
1990#endif
1991
7ade712c 1992#ifdef EXPERIMENTAL_INTERNATIONAL
3c8b3577 1993if (addrlist->prop.utf8_msg && !addrlist->prop.utf8_downcvt && utf8_offered)
7ade712c
JH
1994 sprintf(CS p, " SMTPUTF8"), p += 9;
1995#endif
1996
6c1c3d1d
WB
1997/* check if all addresses have lasthop flag */
1998/* do not send RET and ENVID if true */
7ade712c 1999for (dsn_all_lasthop = TRUE, addr = first_addr;
6c1c3d1d
WB
2000 address_count < max_rcpt && addr != NULL;
2001 addr = addr->next)
2002 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
7ade712c 2003 {
6c1c3d1d 2004 dsn_all_lasthop = FALSE;
7ade712c
JH
2005 break;
2006 }
6c1c3d1d
WB
2007
2008/* Add any DSN flags to the mail command */
2009
7ade712c 2010if (smtp_use_dsn && !dsn_all_lasthop)
6c1c3d1d
WB
2011 {
2012 if (dsn_ret == dsn_ret_hdrs)
2013 {
45500060 2014 Ustrcpy(p, " RET=HDRS");
6c1c3d1d
WB
2015 while (*p) p++;
2016 }
2017 else if (dsn_ret == dsn_ret_full)
2018 {
45500060 2019 Ustrcpy(p, " RET=FULL");
6c1c3d1d
WB
2020 while (*p) p++;
2021 }
2022 if (dsn_envid != NULL)
2023 {
2024 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2025 while (*p) p++;
2026 }
2027 }
6c1c3d1d 2028
6b62e899
JH
2029/* If an authenticated_sender override has been specified for this transport
2030instance, expand it. If the expansion is forced to fail, and there was already
2031an authenticated_sender for this message, the original value will be used.
2032Other expansion failures are serious. An empty result is ignored, but there is
2033otherwise no check - this feature is expected to be used with LMTP and other
2034cases where non-standard addresses (e.g. without domains) might be required. */
2035
fcc8e047 2036if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH
2037 {
2038 yield = ERROR;
2039 goto SEND_QUIT;
2040 }
0756eb3c
PH
2041
2042/* From here until we send the DATA command, we can make use of PIPELINING
2043if the server host supports it. The code has to be able to check the responses
2044at any point, for when the buffer fills up, so we write it totally generally.
2045When PIPELINING is off, each command written reports that it has flushed the
2046buffer. */
2047
2048pending_MAIL = TRUE; /* The block starts with MAIL */
2049
3c8b3577
JH
2050 {
2051 uschar * s = return_path;
2052#ifdef EXPERIMENTAL_INTERNATIONAL
2053 uschar * errstr = NULL;
2054
2055 /* If we must downconvert, do the from-address here. Remember we had to
2056 for the to-addresses (done below), and also (ugly) for re-doing when building
2057 the delivery log line. */
2058
2059 if (addrlist->prop.utf8_msg && (addrlist->prop.utf8_downcvt || !utf8_offered))
2060 {
2061 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2062 {
2063 set_errno(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, NULL);
2064 yield = ERROR;
2065 goto SEND_QUIT;
2066 }
2067 setflag(addrlist, af_utf8_downcvt);
2068 }
2069#endif
2070
2071 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2072 "MAIL FROM:<%s>%s\r\n", s, buffer);
2073 }
2074
0756eb3c
PH
2075mail_command = string_copy(big_buffer); /* Save for later error message */
2076
2077switch(rc)
2078 {
2079 case -1: /* Transmission error */
7ade712c 2080 goto SEND_FAILED;
0756eb3c
PH
2081
2082 case +1: /* Block was sent */
7ade712c 2083 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc 2084 ob->command_timeout))
e97957bc 2085 {
7ade712c
JH
2086 if (errno == 0 && buffer[0] == '4')
2087 {
2088 errno = ERRNO_MAIL4XX;
2089 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2090 }
2091 goto RESPONSE_FAILED;
e97957bc 2092 }
7ade712c
JH
2093 pending_MAIL = FALSE;
2094 break;
0756eb3c
PH
2095 }
2096
2097/* Pass over all the relevant recipient addresses for this host, which are the
2098ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2099several before we have to read the responses for those seen so far. This
2100checking is done by a subroutine because it also needs to be done at the end.
2101Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2102the next one if not all are sent.
2103
2104In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2105last address because we want to abort if any recipients have any kind of
2106problem, temporary or permanent. We know that all recipient addresses will have
2107the PENDING_DEFER status, because only one attempt is ever made, and we know
2108that max_rcpt will be large, so all addresses will be done at once. */
2109
2110for (addr = first_addr;
2111 address_count < max_rcpt && addr != NULL;
2112 addr = addr->next)
2113 {
2114 int count;
2115 BOOL no_flush;
3c8b3577 2116 uschar * rcpt_addr;
0756eb3c 2117
a7538db1 2118 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2119
0756eb3c
PH
2120 if (addr->transport_return != PENDING_DEFER) continue;
2121
2122 address_count++;
2123 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2124
6c1c3d1d
WB
2125 /* Add any DSN flags to the rcpt command and add to the sent string */
2126
2127 p = buffer;
2128 *p = 0;
2129
a7538db1 2130 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB
2131 {
2132 if ((addr->dsn_flags & rf_dsnflags) != 0)
2133 {
2134 int i;
2135 BOOL first = TRUE;
45500060 2136 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB
2137 while (*p) p++;
2138 for (i = 0; i < 4; i++)
6c1c3d1d
WB
2139 if ((addr->dsn_flags & rf_list[i]) != 0)
2140 {
2141 if (!first) *p++ = ',';
2142 first = FALSE;
45500060 2143 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB
2144 while (*p) p++;
2145 }
6c1c3d1d
WB
2146 }
2147
a7538db1
JH
2148 if (addr->dsn_orcpt != NULL)
2149 {
6c1c3d1d
WB
2150 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2151 addr->dsn_orcpt);
2152 while (*p) p++;
2153 }
2154 }
6c1c3d1d 2155
0756eb3c
PH
2156 /* Now send the RCPT command, and process outstanding responses when
2157 necessary. After a timeout on RCPT, we just end the function, leaving the
2158 yield as OK, because this error can often mean that there is a problem with
2159 just one address, so we don't want to delay the host. */
2160
3c8b3577
JH
2161 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2162
2163#ifdef EXPERIMENTAL_INTERNATIONAL
2164 {
2165 uschar * dummy_errstr;
2166 if ( testflag(addrlist, af_utf8_downcvt)
2167 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2168 dummy_errstr
2169 ) )
2170 {
2171 errno = ERRNO_EXPANDFAIL;
2172 goto SEND_FAILED;
2173 }
2174 }
2175#endif
2176
6c1c3d1d 2177 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
3c8b3577 2178 rcpt_addr, igquotstr, buffer);
6c1c3d1d 2179
0756eb3c
PH
2180 if (count < 0) goto SEND_FAILED;
2181 if (count > 0)
2182 {
2183 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
2184 &sync_addr, host, count, ob->address_retry_include_sender,
2185 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2186 sizeof(buffer)))
0756eb3c
PH
2187 {
2188 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2189 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2190 break;
2191
2192 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2193 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2194 case 0: /* No 2xx or 5xx, but no probs */
2195 break;
2196
2197 case -1: goto END_OFF; /* Timeout on RCPT */
2198 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2199 }
2200 pending_MAIL = FALSE; /* Dealt with MAIL */
2201 }
2202 } /* Loop for next address */
2203
2204/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2205permanently or temporarily. We should have flushed and synced after the last
2206RCPT. */
2207
2208if (mua_wrapper)
2209 {
2210 address_item *badaddr;
168dec3b
JH
2211 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2212 if (badaddr->transport_return != PENDING_OK)
2213 {
2214 /*XXX could we find a better errno than 0 here? */
2215 set_errno(addrlist, 0, badaddr->message, FAIL,
2216 testflag(badaddr, af_pass_message), NULL);
2217 ok = FALSE;
2218 break;
2219 }
0756eb3c
PH
2220 }
2221
2222/* If ok is TRUE, we know we have got at least one good recipient, and must now
2223send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2224have a good recipient buffered up if we are pipelining. We don't want to waste
2225time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2226are pipelining. The responses are all handled by sync_responses(). */
2227
2228if (ok || (smtp_use_pipelining && !mua_wrapper))
2229 {
2230 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2231 if (count < 0) goto SEND_FAILED;
2232 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
2233 host, count, ob->address_retry_include_sender, pending_MAIL,
2234 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
2235 {
2236 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2237 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2238 break;
2239
2240 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2241 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2242 case 0: break; /* No 2xx or 5xx, but no probs */
2243
2244 case -1: goto END_OFF; /* Timeout on RCPT */
2245 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2246 }
2247 }
2248
2249/* Save the first address of the next batch. */
2250
2251first_addr = addr;
2252
2253/* If there were no good recipients (but otherwise there have been no
2254problems), just set ok TRUE, since we have handled address-specific errors
2255already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2256for handling the SMTP dot-handling protocol, flagging to apply to headers as
2257well as body. Set the appropriate timeout value to be used for each chunk.
2258(Haven't been able to make it work using select() for writing yet.) */
2259
2260if (!ok) ok = TRUE; else
2261 {
2262 sigalrm_seen = FALSE;
2263 transport_write_timeout = ob->data_timeout;
2264 smtp_command = US"sending data block"; /* For error messages */
2265 DEBUG(D_transport|D_v)
2266 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2267 transport_count = 0;
a7538db1 2268
80a47a2c 2269#ifndef DISABLE_DKIM
4cd12fe9
TK
2270 ok = dkim_transport_write_message(addrlist, inblock.sock,
2271 topt_use_crlf | topt_end_dot | topt_escape_headers |
2272 (tblock->body_only? topt_no_headers : 0) |
2273 (tblock->headers_only? topt_no_body : 0) |
2274 (tblock->return_path_add? topt_add_return_path : 0) |
2275 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2276 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2277 0, /* No size limit */
2278 tblock->add_headers, tblock->remove_headers,
2279 US".", US"..", /* Escaping strings */
2280 tblock->rewrite_rules, tblock->rewrite_existflags,
2281 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2282 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK
2283 );
2284#else
0756eb3c
PH
2285 ok = transport_write_message(addrlist, inblock.sock,
2286 topt_use_crlf | topt_end_dot | topt_escape_headers |
2287 (tblock->body_only? topt_no_headers : 0) |
2288 (tblock->headers_only? topt_no_body : 0) |
2289 (tblock->return_path_add? topt_add_return_path : 0) |
2290 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2291 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2292 0, /* No size limit */
2293 tblock->add_headers, tblock->remove_headers,
2294 US".", US"..", /* Escaping strings */
2295 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2296#endif
0756eb3c
PH
2297
2298 /* transport_write_message() uses write() because it is called from other
2299 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2300 it can exit with "Broken pipe" as its error. This really means that the
2301 socket got closed at the far end. */
2302
2303 transport_write_timeout = 0; /* for subsequent transports */
2304
2305 /* Failure can either be some kind of I/O disaster (including timeout),
2306 or the failure of a transport filter or the expansion of added headers. */
2307
2308 if (!ok)
2309 {
2310 buffer[0] = 0; /* There hasn't been a response */
2311 goto RESPONSE_FAILED;
2312 }
2313
2314 /* We used to send the terminating "." explicitly here, but because of
2315 buffering effects at both ends of TCP/IP connections, you don't gain
2316 anything by keeping it separate, so it might as well go in the final
2317 data buffer for efficiency. This is now done by setting the topt_end_dot
2318 flag above. */
2319
2320 smtp_command = US"end of data";
2321
8ccd00b1 2322#ifndef DISABLE_PRDR
fd98a5c6
JH
2323 /* For PRDR we optionally get a partial-responses warning
2324 * followed by the individual responses, before going on with
2325 * the overall response. If we don't get the warning then deal
2326 * with per non-PRDR. */
2327 if(prdr_active)
2328 {
2329 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2330 ob->final_timeout);
2331 if (!ok && errno == 0)
2332 switch(buffer[0])
2333 {
2334 case '2': prdr_active = FALSE;
2335 ok = TRUE;
2336 break;
2337 case '4': errno = ERRNO_DATA4XX;
2338 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2339 break;
2340 }
2341 }
2342 else
2343#endif
2344
2345 /* For non-PRDR SMTP, we now read a single response that applies to the
2346 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2347
e97957bc
PH
2348 if (!lmtp)
2349 {
2350 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2351 ob->final_timeout);
2352 if (!ok && errno == 0 && buffer[0] == '4')
2353 {
2354 errno = ERRNO_DATA4XX;
2355 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2356 }
2357 }
0756eb3c
PH
2358
2359 /* For LMTP, we get back a response for every RCPT command that we sent;
2360 some may be accepted and some rejected. For those that get a response, their
2361 status is fixed; any that are accepted have been handed over, even if later
2362 responses crash - at least, that's how I read RFC 2033.
2363
2364 If all went well, mark the recipient addresses as completed, record which
2365 host/IPaddress they were delivered to, and cut out RSET when sending another
2366 message down the same channel. Write the completed addresses to the journal
2367 now so that they are recorded in case there is a crash of hardware or
2368 software before the spool gets updated. Also record the final SMTP
2369 confirmation if needed (for SMTP only). */
2370
2371 if (ok)
2372 {
2373 int flag = '=';
2374 int delivery_time = (int)(time(NULL) - start_delivery_time);
2375 int len;
0756eb3c
PH
2376 uschar *conf = NULL;
2377 send_rset = FALSE;
2378
0756eb3c
PH
2379 /* Set up confirmation if needed - applies only to SMTP */
2380
d68218c7 2381 if (
774ef2d7 2382#ifndef EXPERIMENTAL_EVENT
d68218c7 2383 (log_extra_selector & LX_smtp_confirmation) != 0 &&
a7538db1 2384#endif
d68218c7
JH
2385 !lmtp
2386 )
0756eb3c 2387 {
55414b25
JH
2388 const uschar *s = string_printing(buffer);
2389 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2390 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
2391 }
2392
fd98a5c6 2393 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2394 each one. */
2395
2396 for (addr = addrlist; addr != first_addr; addr = addr->next)
2397 {
2398 if (addr->transport_return != PENDING_OK) continue;
2399
2400 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2401 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2402 address. For temporary errors, add a retry item for the address so that
2403 it doesn't get tried again too soon. */
0756eb3c 2404
8ccd00b1 2405#ifndef DISABLE_PRDR
fd98a5c6
JH
2406 if (lmtp || prdr_active)
2407#else
0756eb3c 2408 if (lmtp)
fd98a5c6 2409#endif
0756eb3c
PH
2410 {
2411 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2412 ob->final_timeout))
2413 {
2414 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2415 addr->message = string_sprintf(
8ccd00b1 2416#ifndef DISABLE_PRDR
fd98a5c6
JH
2417 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2418#else
2419 "LMTP error after %s: %s",
2420#endif
0756eb3c 2421 big_buffer, string_printing(buffer));
75def545
PH
2422 setflag(addr, af_pass_message); /* Allow message to go to user */
2423 if (buffer[0] == '5')
2424 addr->transport_return = FAIL;
2425 else
2426 {
e97957bc
PH
2427 errno = ERRNO_DATA4XX;
2428 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2429 addr->transport_return = DEFER;
8ccd00b1 2430#ifndef DISABLE_PRDR
fd98a5c6
JH
2431 if (!prdr_active)
2432#endif
2433 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2434 }
0756eb3c
PH
2435 continue;
2436 }
2437 completed_address = TRUE; /* NOW we can set this flag */
c0ea85ab
TF
2438 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2439 {
55414b25
JH
2440 const uschar *s = string_printing(buffer);
2441 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2442 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2443 }
0756eb3c
PH
2444 }
2445
2446 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2447 actual host that was used. */
0756eb3c
PH
2448
2449 addr->transport_return = OK;
2450 addr->more_errno = delivery_time;
d427a7f9 2451 addr->host_used = host;
0756eb3c
PH
2452 addr->special_action = flag;
2453 addr->message = conf;
8ccd00b1 2454#ifndef DISABLE_PRDR
fd98a5c6
JH
2455 if (prdr_active) addr->flags |= af_prdr_used;
2456#endif
0756eb3c
PH
2457 flag = '-';
2458
8ccd00b1 2459#ifndef DISABLE_PRDR
fd98a5c6
JH
2460 if (!prdr_active)
2461#endif
2462 {
2463 /* Update the journal. For homonymic addresses, use the base address plus
2464 the transport name. See lots of comments in deliver.c about the reasons
2465 for the complications when homonyms are involved. Just carry on after
2466 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2467
fd98a5c6
JH
2468 if (testflag(addr, af_homonym))
2469 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2470 else
2471 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2472
fd98a5c6
JH
2473 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2474 len = Ustrlen(CS buffer);
2475 if (write(journal_fd, buffer, len) != len)
2476 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2477 "%s: %s", buffer, strerror(errno));
2478 }
0756eb3c
PH
2479 }
2480
8ccd00b1 2481#ifndef DISABLE_PRDR
fd98a5c6
JH
2482 if (prdr_active)
2483 {
2484 /* PRDR - get the final, overall response. For any non-success
2485 upgrade all the address statuses. */
2486 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2487 ob->final_timeout);
2488 if (!ok)
2489 {
2490 if(errno == 0 && buffer[0] == '4')
2491 {
2492 errno = ERRNO_DATA4XX;
2493 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2494 }
2495 for (addr = addrlist; addr != first_addr; addr = addr->next)
2496 if (buffer[0] == '5' || addr->transport_return == OK)
2497 addr->transport_return = PENDING_OK; /* allow set_errno action */
2498 goto RESPONSE_FAILED;
2499 }
2500
2501 /* Update the journal, or setup retry. */
2502 for (addr = addrlist; addr != first_addr; addr = addr->next)
2503 if (addr->transport_return == OK)
2504 {
2505 if (testflag(addr, af_homonym))
2506 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2507 else
2508 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2509
fd98a5c6
JH
2510 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2511 len = Ustrlen(CS buffer);
2512 if (write(journal_fd, buffer, len) != len)
2513 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2514 "%s: %s", buffer, strerror(errno));
2515 }
2516 else if (addr->transport_return == DEFER)
2517 retry_add_item(addr, addr->address_retry_key, -2);
2518 }
2519#endif
2520
0756eb3c
PH
2521 /* Ensure the journal file is pushed out to disk. */
2522
54fc8428 2523 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2524 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2525 strerror(errno));
2526 }
2527 }
2528
2529
2530/* Handle general (not specific to one address) failures here. The value of ok
2531is used to skip over this code on the falling through case. A timeout causes a
2532deferral. Other errors may defer or fail according to the response code, and
2533may set up a special errno value, e.g. after connection chopped, which is
2534assumed if errno == 0 and there is no text in the buffer. If control reaches
2535here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2536the problem is not related to this specific message. */
2537
2538if (!ok)
2539 {
2540 int code;
2541
2542 RESPONSE_FAILED:
2543 save_errno = errno;
2544 message = NULL;
2545 send_quit = check_response(host, &save_errno, addrlist->more_errno,
447d236c 2546 buffer, &code, &message, &pass_message);
0756eb3c
PH
2547 goto FAILED;
2548
2549 SEND_FAILED:
2550 save_errno = errno;
2551 code = '4';
2552 message = US string_sprintf("send() to %s [%s] failed: %s",
2553 host->name, host->address, strerror(save_errno));
2554 send_quit = FALSE;
2555 goto FAILED;
2556
2557 /* This label is jumped to directly when a TLS negotiation has failed,
2558 or was not done for a host for which it is required. Values will be set
2559 in message and save_errno, and setting_up will always be true. Treat as
2560 a temporary error. */
2561
a7538db1 2562#ifdef SUPPORT_TLS
0756eb3c
PH
2563 TLS_FAILED:
2564 code = '4';
a7538db1 2565#endif
0756eb3c
PH
2566
2567 /* If the failure happened while setting up the call, see if the failure was
2568 a 5xx response (this will either be on connection, or following HELO - a 5xx
2569 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2570 never going to accept them. For other errors during setting up (timeouts or
2571 whatever), defer all addresses, and yield DEFER, so that the host is not
2572 tried again for a while. */
2573
2574 FAILED:
2575 ok = FALSE; /* For when reached by GOTO */
2576
2577 if (setting_up)
2578 {
2579 if (code == '5')
c562fd30 2580 set_errno(addrlist, save_errno, message, FAIL, pass_message, host);
0756eb3c
PH
2581 else
2582 {
c562fd30 2583 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
0756eb3c
PH
2584 yield = DEFER;
2585 }
2586 }
2587
e97957bc 2588 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2589 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2590 the contents of the message rather than a real error on the connection. These
2591 cases are treated in the same way as a 4xx response. This next bit of code
2592 does the classification. */
0756eb3c 2593
e97957bc 2594 else
0756eb3c 2595 {
e97957bc 2596 BOOL message_error;
0756eb3c 2597
e97957bc
PH
2598 switch(save_errno)
2599 {
250b6871
JH
2600#ifdef EXPERIMENTAL_INTERNATIONAL
2601 case ERRNO_UTF8_FWD:
2602 code = '5';
2603 /*FALLTHROUGH*/
2604#endif
e97957bc
PH
2605 case 0:
2606 case ERRNO_MAIL4XX:
2607 case ERRNO_DATA4XX:
250b6871
JH
2608 message_error = TRUE;
2609 break;
0756eb3c 2610
e97957bc 2611 case ETIMEDOUT:
250b6871
JH
2612 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2613 Ustrncmp(smtp_command,"end ",4) == 0;
2614 break;
e97957bc
PH
2615
2616 case ERRNO_SMTPCLOSED:
250b6871
JH
2617 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2618 break;
e97957bc
PH
2619
2620 default:
250b6871
JH
2621 message_error = FALSE;
2622 break;
e97957bc 2623 }
0756eb3c 2624
e97957bc 2625 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2626
e97957bc
PH
2627 (a) negative response or timeout after MAIL
2628 (b) negative response after DATA
2629 (c) negative response or timeout or dropped connection after "."
250b6871 2630 (d) utf8 support required and not offered
0756eb3c 2631
e97957bc
PH
2632 It won't be a negative response or timeout after RCPT, as that is dealt
2633 with separately above. The action in all cases is to set an appropriate
2634 error code for all the addresses, but to leave yield set to OK because the
2635 host itself has not failed. Of course, it might in practice have failed
2636 when we've had a timeout, but if so, we'll discover that at the next
2637 delivery attempt. For a temporary error, set the message_defer flag, and
2638 write to the logs for information if this is not the last host. The error
2639 for the last host will be logged as part of the address's log line. */
2640
2641 if (message_error)
0756eb3c 2642 {
e97957bc
PH
2643 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2644 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
c562fd30 2645 pass_message, host);
e97957bc
PH
2646
2647 /* If there's an errno, the message contains just the identity of
2648 the host. */
2649
2650 if (code != '5') /* Anything other than 5 is treated as temporary */
2651 {
2652 if (save_errno > 0)
2653 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2654 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2655 msglog_line(host, message);
e97957bc
PH
2656 *message_defer = TRUE;
2657 }
2658 }
2659
2660 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2661 ".", or some other transportation error. We defer all addresses and yield
2662 DEFER, except for the case of failed add_headers expansion, or a transport
2663 filter failure, when the yield should be ERROR, to stop it trying other
2664 hosts. */
2665
2666 else
2667 {
2668 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2669 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
c562fd30 2670 set_errno(addrlist, save_errno, message, DEFER, pass_message, host);
0756eb3c
PH
2671 }
2672 }
2673 }
2674
2675
2676/* If all has gone well, send_quit will be set TRUE, implying we can end the
2677SMTP session tidily. However, if there were too many addresses to send in one
2678message (indicated by first_addr being non-NULL) we want to carry on with the
2679rest of them. Also, it is desirable to send more than one message down the SMTP
2680connection if there are several waiting, provided we haven't already sent so
2681many as to hit the configured limit. The function transport_check_waiting looks
2682for a waiting message and returns its id. Then transport_pass_socket tries to
2683set up a continued delivery by passing the socket on to another process. The
2684variable send_rset is FALSE if a message has just been successfully transfered.
2685
2686If we are already sending down a continued channel, there may be further
2687addresses not yet delivered that are aimed at the same host, but which have not
2688been passed in this run of the transport. In this case, continue_more will be
2689true, and all we should do is send RSET if necessary, and return, leaving the
2690channel open.
2691
2692However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2693do not want to continue with other messages down the same channel, because that
2694can lead to looping between two or more messages, all with the same,
2695temporarily failing address(es). [The retry information isn't updated yet, so
2696new processes keep on trying.] We probably also don't want to try more of this
2697message's addresses either.
2698
2699If we have started a TLS session, we have to end it before passing the
2700connection to a new process. However, not all servers can handle this (Exim
2701can), so we do not pass such a connection on if the host matches
2702hosts_nopass_tls. */
2703
2704DEBUG(D_transport)
2705 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2706 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2707 continue_more, yield, (first_addr == NULL)? "":"not ");
2708
2709if (completed_address && ok && send_quit)
2710 {
2711 BOOL more;
a39bd74d
JB
2712 smtp_compare_t t_compare;
2713
2714 t_compare.tblock = tblock;
2715 t_compare.current_sender_address = sender_address;
2716
5130845b
JH
2717 if ( first_addr != NULL
2718 || continue_more
2719 || ( ( tls_out.active < 0
2720 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2721 )
0756eb3c
PH
2722 &&
2723 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB
2724 tblock->connection_max_messages, new_message_id, &more,
2725 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 2726 ) )
0756eb3c
PH
2727 {
2728 uschar *msg;
447d236c 2729 BOOL pass_message;
0756eb3c
PH
2730
2731 if (send_rset)
2732 {
2733 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2734 {
2735 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2736 host->address, strerror(save_errno));
2737 send_quit = FALSE;
2738 }
2739 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2740 ob->command_timeout)))
2741 {
2742 int code;
447d236c
PH
2743 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2744 &pass_message);
0756eb3c
PH
2745 if (!send_quit)
2746 {
c562fd30
JH
2747 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2748 host->name, host->address, msg);
0756eb3c
PH
2749 }
2750 }
2751 }
2752
2753 /* Either RSET was not needed, or it succeeded */
2754
2755 if (ok)
2756 {
2757 if (first_addr != NULL) /* More addresses still to be sent */
2758 { /* in this run of the transport */
2759 continue_sequence++; /* Causes * in logging */
2760 goto SEND_MESSAGE;
2761 }
2762 if (continue_more) return yield; /* More addresses for another run */
2763
2764 /* Pass the socket to a new Exim process. Before doing so, we must shut
2765 down TLS. Not all MTAs allow for the continuation of the SMTP session
2766 when TLS is shut down. We test for this by sending a new EHLO. If we
2767 don't get a good response, we don't attempt to pass the socket on. */
2768
a7538db1 2769#ifdef SUPPORT_TLS
817d9f57 2770 if (tls_out.active >= 0)
0756eb3c 2771 {
817d9f57 2772 tls_close(FALSE, TRUE);
061b7ebd
PP
2773 if (smtps)
2774 ok = FALSE;
2775 else
2776 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2777 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2778 ob->command_timeout);
0756eb3c 2779 }
a7538db1 2780#endif
0756eb3c
PH
2781
2782 /* If the socket is successfully passed, we musn't send QUIT (or
2783 indeed anything!) from here. */
2784
2785 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2786 new_message_id, inblock.sock))
2787 {
2788 send_quit = FALSE;
2789 }
2790 }
2791
2792 /* If RSET failed and there are addresses left, they get deferred. */
2793
c562fd30 2794 else set_errno(first_addr, errno, msg, DEFER, FALSE, host);
0756eb3c
PH
2795 }
2796 }
2797
2798/* End off tidily with QUIT unless the connection has died or the socket has
2799been passed to another process. There has been discussion on the net about what
2800to do after sending QUIT. The wording of the RFC suggests that it is necessary
2801to wait for a response, but on the other hand, there isn't anything one can do
2802with an error response, other than log it. Exim used to do that. However,
2803further discussion suggested that it is positively advantageous not to wait for
2804the response, but to close the session immediately. This is supposed to move
2805the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2806load from the server. (Hosts that are both servers and clients may not see much
2807difference, of course.) Further discussion indicated that this was safe to do
2808on Unix systems which have decent implementations of TCP/IP that leave the
2809connection around for a while (TIME_WAIT) after the application has gone away.
2810This enables the response sent by the server to be properly ACKed rather than
2811timed out, as can happen on broken TCP/IP implementations on other OS.
2812
2813This change is being made on 31-Jul-98. After over a year of trouble-free
2814operation, the old commented-out code was removed on 17-Sep-99. */
2815
2816SEND_QUIT:
2817if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2818
2819END_OFF:
2820
2821#ifdef SUPPORT_TLS
817d9f57 2822tls_close(FALSE, TRUE);
0756eb3c
PH
2823#endif
2824
2825/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2826works because the NULL setting is passed back to the calling process, and
2827remote_max_parallel is forced to 1 when delivering over an existing connection,
2828
2829If all went well and continue_more is set, we shouldn't actually get here if
2830there are further addresses, as the return above will be taken. However,
2831writing RSET might have failed, or there may be other addresses whose hosts are
2832specified in the transports, and therefore not visible at top level, in which
2833case continue_more won't get set. */
2834
f1e894f3 2835(void)close(inblock.sock);
a7538db1 2836
774ef2d7
JH
2837#ifdef EXPERIMENTAL_EVENT
2838(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH
2839#endif
2840
0756eb3c
PH
2841continue_transport = NULL;
2842continue_hostname = NULL;
2843return yield;
2844}
2845
2846
2847
2848
2849/*************************************************
2850* Closedown entry point *
2851*************************************************/
2852
2853/* This function is called when exim is passed an open smtp channel
2854from another incarnation, but the message which it has been asked
2855to deliver no longer exists. The channel is on stdin.
2856
2857We might do fancy things like looking for another message to send down
2858the channel, but if the one we sought has gone, it has probably been
2859delivered by some other process that itself will seek further messages,
2860so just close down our connection.
2861
2862Argument: pointer to the transport instance block
2863Returns: nothing
2864*/
2865
2866void
2867smtp_transport_closedown(transport_instance *tblock)
2868{
2869smtp_transport_options_block *ob =
2870 (smtp_transport_options_block *)(tblock->options_block);
2871smtp_inblock inblock;
2872smtp_outblock outblock;
2873uschar buffer[256];
2874uschar inbuffer[4096];
2875uschar outbuffer[16];
2876
2877inblock.sock = fileno(stdin);
2878inblock.buffer = inbuffer;
2879inblock.buffersize = sizeof(inbuffer);
2880inblock.ptr = inbuffer;
2881inblock.ptrend = inbuffer;
2882
2883outblock.sock = inblock.sock;
2884outblock.buffersize = sizeof(outbuffer);
2885outblock.buffer = outbuffer;
2886outblock.ptr = outbuffer;
2887outblock.cmd_count = 0;
2888outblock.authenticating = FALSE;
2889
2890(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2891(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2892 ob->command_timeout);
f1e894f3 2893(void)close(inblock.sock);
0756eb3c
PH
2894}
2895
2896
2897
2898/*************************************************
2899* Prepare addresses for delivery *
2900*************************************************/
2901
2902/* This function is called to flush out error settings from previous delivery
2903attempts to other hosts. It also records whether we got here via an MX record
2904or not in the more_errno field of the address. We are interested only in
2905addresses that are still marked DEFER - others may have got delivered to a
2906previously considered IP address. Set their status to PENDING_DEFER to indicate
2907which ones are relevant this time.
2908
2909Arguments:
2910 addrlist the list of addresses
2911 host the host we are delivering to
2912
2913Returns: the first address for this delivery
2914*/
2915
2916static address_item *
2917prepare_addresses(address_item *addrlist, host_item *host)
2918{
2919address_item *first_addr = NULL;
2920address_item *addr;
2921for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH
2922 if (addr->transport_return == DEFER)
2923 {
2924 if (first_addr == NULL) first_addr = addr;
2925 addr->transport_return = PENDING_DEFER;
2926 addr->basic_errno = 0;
2927 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2928 addr->message = NULL;
a7538db1 2929#ifdef SUPPORT_TLS
168dec3b
JH
2930 addr->cipher = NULL;
2931 addr->ourcert = NULL;
2932 addr->peercert = NULL;
2933 addr->peerdn = NULL;
2934 addr->ocsp = OCSP_NOT_REQ;
a7538db1 2935#endif
168dec3b 2936 }
0756eb3c
PH
2937return first_addr;
2938}
2939
2940
2941
2942/*************************************************
2943* Main entry point *
2944*************************************************/
2945
2946/* See local README for interface details. As this is a remote transport, it is
2947given a chain of addresses to be delivered in one connection, if possible. It
2948always returns TRUE, indicating that each address has its own independent
2949status set, except if there is a setting up problem, in which case it returns
2950FALSE. */
2951
2952BOOL
2953smtp_transport_entry(
2954 transport_instance *tblock, /* data for this instantiation */
2955 address_item *addrlist) /* addresses we are working on */
2956{
2957int cutoff_retry;
2958int port;
2959int hosts_defer = 0;
2960int hosts_fail = 0;
2961int hosts_looked_up = 0;
2962int hosts_retry = 0;
2963int hosts_serial = 0;
2964int hosts_total = 0;
8e669ac1 2965int total_hosts_tried = 0;
0756eb3c
PH
2966address_item *addr;
2967BOOL expired = TRUE;
2968BOOL continuing = continue_hostname != NULL;
2969uschar *expanded_hosts = NULL;
2970uschar *pistring;
2971uschar *tid = string_sprintf("%s transport", tblock->name);
2972smtp_transport_options_block *ob =
2973 (smtp_transport_options_block *)(tblock->options_block);
2974host_item *hostlist = addrlist->host_list;
2975host_item *host = NULL;
2976
2977DEBUG(D_transport)
2978 {
2979 debug_printf("%s transport entered\n", tblock->name);
2980 for (addr = addrlist; addr != NULL; addr = addr->next)
2981 debug_printf(" %s\n", addr->address);
2982 if (continuing) debug_printf("already connected to %s [%s]\n",
2983 continue_hostname, continue_host_address);
2984 }
2985
f6c332bd
PH
2986/* Set the flag requesting that these hosts be added to the waiting
2987database if the delivery fails temporarily or if we are running with
2988queue_smtp or a 2-stage queue run. This gets unset for certain
2989kinds of error, typically those that are specific to the message. */
2990
2991update_waiting = TRUE;
2992
0756eb3c
PH
2993/* If a host list is not defined for the addresses - they must all have the
2994same one in order to be passed to a single transport - or if the transport has
2995a host list with hosts_override set, use the host list supplied with the
2996transport. It is an error for this not to exist. */
2997
2998if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2999 {
3000 if (ob->hosts == NULL)
3001 {
3002 addrlist->message = string_sprintf("%s transport called with no hosts set",
3003 tblock->name);
3004 addrlist->transport_return = PANIC;
3005 return FALSE; /* Only top address has status */
3006 }
3007
3008 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3009 ob->hosts);
3010
3011 /* If the transport's host list contains no '$' characters, and we are not
3012 randomizing, it is fixed and therefore a chain of hosts can be built once
3013 and for all, and remembered for subsequent use by other calls to this
3014 transport. If, on the other hand, the host list does contain '$', or we are
3015 randomizing its order, we have to rebuild it each time. In the fixed case,
3016 as the hosts string will never be used again, it doesn't matter that we
3017 replace all the : characters with zeros. */
3018
3019 if (ob->hostlist == NULL)
3020 {
3021 uschar *s = ob->hosts;
3022
3023 if (Ustrchr(s, '$') != NULL)
3024 {
d427a7f9 3025 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH
3026 {
3027 addrlist->message = string_sprintf("failed to expand list of hosts "
3028 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3029 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3030 return FALSE; /* Only top address has status */
3031 }
3032 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3033 "\"%s\"\n", s, expanded_hosts);
3034 s = expanded_hosts;
3035 }
3036 else
3037 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3038
3039 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3040
e276e04b
TF
3041 /* Check that the expansion yielded something useful. */
3042 if (hostlist == NULL)
3043 {
3044 addrlist->message =
3045 string_sprintf("%s transport has empty hosts setting", tblock->name);
3046 addrlist->transport_return = PANIC;
3047 return FALSE; /* Only top address has status */
3048 }
3049
0756eb3c
PH
3050 /* If there was no expansion of hosts, save the host list for
3051 next time. */
3052
d427a7f9 3053 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH
3054 }
3055
3056 /* This is not the first time this transport has been run in this delivery;
3057 the host list was built previously. */
3058
55414b25
JH
3059 else
3060 hostlist = ob->hostlist;
0756eb3c
PH
3061 }
3062
3063/* The host list was supplied with the address. If hosts_randomize is set, we
3064must sort it into a random order if it did not come from MX records and has not
3065already been randomized (but don't bother if continuing down an existing
3066connection). */
3067
3068else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3069 {
3070 host_item *newlist = NULL;
3071 while (hostlist != NULL)
3072 {
3073 host_item *h = hostlist;
3074 hostlist = hostlist->next;
3075
3076 h->sort_key = random_number(100);
3077
3078 if (newlist == NULL)
3079 {
3080 h->next = NULL;
3081 newlist = h;
3082 }
3083 else if (h->sort_key < newlist->sort_key)
3084 {
3085 h->next = newlist;
3086 newlist = h;
3087 }
3088 else
3089 {
3090 host_item *hh = newlist;
3091 while (hh->next != NULL)
3092 {
3093 if (h->sort_key < hh->next->sort_key) break;
3094 hh = hh->next;
3095 }
3096 h->next = hh->next;
3097 hh->next = h;
3098 }
3099 }
3100
3101 hostlist = addrlist->host_list = newlist;
3102 }
3103
2d280592 3104/* Sort out the default port. */
0756eb3c
PH
3105
3106if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 3107
0756eb3c
PH
3108/* For each host-plus-IP-address on the list:
3109
3110. If this is a continued delivery and the host isn't the one with the
3111 current connection, skip.
3112
3113. If the status is unusable (i.e. previously failed or retry checked), skip.
3114
3115. If no IP address set, get the address, either by turning the name into
3116 an address, calling gethostbyname if gethostbyname is on, or by calling
3117 the DNS. The DNS may yield multiple addresses, in which case insert the
3118 extra ones into the list.
3119
3120. Get the retry data if not previously obtained for this address and set the
3121 field which remembers the state of this address. Skip if the retry time is
3122 not reached. If not, remember whether retry data was found. The retry string
3123 contains both the name and the IP address.
3124
3125. Scan the list of addresses and mark those whose status is DEFER as
3126 PENDING_DEFER. These are the only ones that will be processed in this cycle
3127 of the hosts loop.
3128
3129. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3130 Some addresses may be successfully delivered, others may fail, and yet
3131 others may get temporary errors and so get marked DEFER.
3132
3133. The return from the delivery attempt is OK if a connection was made and a
3134 valid SMTP dialogue was completed. Otherwise it is DEFER.
3135
3136. If OK, add a "remove" retry item for this host/IPaddress, if any.
3137
3138. If fail to connect, or other defer state, add a retry item.
3139
3140. If there are any addresses whose status is still DEFER, carry on to the
3141 next host/IPaddress, unless we have tried the number of hosts given
533244af 3142 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
3143 there is some fancy logic for hosts_max_try that means its limit can be
3144 overstepped in some circumstances.
0756eb3c
PH
3145
3146If we get to the end of the list, all hosts have deferred at least one address,
3147or not reached their retry times. If delay_after_cutoff is unset, it requests a
3148delivery attempt to those hosts whose last try was before the arrival time of
3149the current message. To cope with this, we have to go round the loop a second
3150time. After that, set the status and error data for any addresses that haven't
3151had it set already. */
3152
3153for (cutoff_retry = 0; expired &&
3154 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3155 cutoff_retry++)
3156 {
3157 host_item *nexthost = NULL;
3158 int unexpired_hosts_tried = 0;
3159
3160 for (host = hostlist;
8e669ac1 3161 host != NULL &&
533244af
PH
3162 unexpired_hosts_tried < ob->hosts_max_try &&
3163 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
3164 host = nexthost)
3165 {
3166 int rc;
3167 int host_af;
3168 uschar *rs;
3169 BOOL serialized = FALSE;
3170 BOOL host_is_expired = FALSE;
3171 BOOL message_defer = FALSE;
3172 BOOL ifchanges = FALSE;
3173 BOOL some_deferred = FALSE;
3174 address_item *first_addr = NULL;
3175 uschar *interface = NULL;
3176 uschar *retry_host_key = NULL;
3177 uschar *retry_message_key = NULL;
3178 uschar *serialize_key = NULL;
3179
9c4e8f60
PH
3180 /* Default next host is next host. :-) But this can vary if the
3181 hosts_max_try limit is hit (see below). It may also be reset if a host
3182 address is looked up here (in case the host was multihomed). */
3183
3184 nexthost = host->next;
3185
0756eb3c
PH
3186 /* If the address hasn't yet been obtained from the host name, look it up
3187 now, unless the host is already marked as unusable. If it is marked as
3188 unusable, it means that the router was unable to find its IP address (in
3189 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3190 the lookup failed last time. We don't get this far if *all* MX records
3191 point to non-existent hosts; that is treated as a hard error.
3192
3193 We can just skip this host entirely. When the hosts came from the router,
3194 the address will timeout based on the other host(s); when the address is
3195 looked up below, there is an explicit retry record added.
3196
3197 Note that we mustn't skip unusable hosts if the address is not unset; they
3198 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3199
3200 if (host->address == NULL)
3201 {
322050c2 3202 int new_port, flags;
7cd1141b 3203 host_item *hh;
0756eb3c
PH
3204
3205 if (host->status >= hstatus_unusable)
3206 {
3207 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3208 host->name);
3209 continue;
3210 }
3211
3212 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3213
7cd1141b
PH
3214 /* The host name is permitted to have an attached port. Find it, and
3215 strip it from the name. Just remember it for now. */
3216
3217 new_port = host_item_get_port(host);
3218
3219 /* Count hosts looked up */
3220
0756eb3c
PH
3221 hosts_looked_up++;
3222
3223 /* Find by name if so configured, or if it's an IP address. We don't
3224 just copy the IP address, because we need the test-for-local to happen. */
3225
322050c2
PH
3226 flags = HOST_FIND_BY_A;
3227 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3228 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3229
7e66e54d 3230 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3231 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3232 else
0756eb3c 3233 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 3234 &ob->dnssec, /* domains for request/require */
55414b25 3235 NULL, NULL);
0756eb3c 3236
7cd1141b
PH
3237 /* Update the host (and any additional blocks, resulting from
3238 multihoming) with a host-specific port, if any. */
3239
3240 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3241
0756eb3c
PH
3242 /* Failure to find the host at this time (usually DNS temporary failure)
3243 is really a kind of routing failure rather than a transport failure.
3244 Therefore we add a retry item of the routing kind, not to stop us trying
3245 to look this name up here again, but to ensure the address gets timed
3246 out if the failures go on long enough. A complete failure at this point
3247 commonly points to a configuration error, but the best action is still
3248 to carry on for the next host. */
3249
3250 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3251 {
3252 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3253 expired = FALSE;
3254 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3255 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3256 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3257 host->status = hstatus_unusable;
3258
3259 for (addr = addrlist; addr != NULL; addr = addr->next)
3260 {
3261 if (addr->transport_return != DEFER) continue;
3262 addr->basic_errno = ERRNO_UNKNOWNHOST;
3263 addr->message =
3264 string_sprintf("failed to lookup IP address for %s", host->name);
3265 }
3266 continue;
3267 }
3268
3269 /* If the host is actually the local host, we may have a problem, or
3270 there may be some cunning configuration going on. In the problem case,
3271 log things and give up. The default transport status is already DEFER. */
3272
3273 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3274 {
3275 for (addr = addrlist; addr != NULL; addr = addr->next)
3276 {
3277 addr->basic_errno = 0;
3278 addr->message = string_sprintf("%s transport found host %s to be "
3279 "local", tblock->name, host->name);
3280 }
3281 goto END_TRANSPORT;
3282 }
3283 } /* End of block for IP address lookup */
3284
3285 /* If this is a continued delivery, we are interested only in the host
3286 which matches the name of the existing open channel. The check is put
3287 here after the local host lookup, in case the name gets expanded as a
3288 result of the lookup. Set expired FALSE, to save the outer loop executing
3289 twice. */
3290
3291 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3292 Ustrcmp(continue_host_address, host->address) != 0))
3293 {
3294 expired = FALSE;
3295 continue; /* With next host */
3296 }
3297
9c4e8f60
PH
3298 /* Reset the default next host in case a multihomed host whose addresses
3299 are not looked up till just above added to the host list. */
83364d30
PH
3300
3301 nexthost = host->next;
3302
0756eb3c
PH
3303 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3304 domain is in queue_smtp_domains, we don't actually want to attempt any
3305 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3306 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3307 were not in it. We don't want to hold up all SMTP deliveries! Except when
3308 doing a two-stage queue run, don't do this if forcing. */
3309
3310 if ((!deliver_force || queue_2stage) && (queue_smtp ||
55414b25
JH
3311 match_isinlist(addrlist->domain,
3312 (const uschar **)&queue_smtp_domains, 0,
cf39cf57 3313 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
3314 {
3315 expired = FALSE;
3316 for (addr = addrlist; addr != NULL; addr = addr->next)
3317 {
3318 if (addr->transport_return != DEFER) continue;
3319 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3320 }
3321 continue; /* With next host */
3322 }
3323
3324 /* Count hosts being considered - purely for an intelligent comment
3325 if none are usable. */
3326
3327 hosts_total++;
3328
3329 /* Set $host and $host address now in case they are needed for the
3330 interface expansion or the serialize_hosts check; they remain set if an
3331 actual delivery happens. */
3332
3333 deliver_host = host->name;
3334 deliver_host_address = host->address;
783b385f
JH
3335 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3336 : host->dnssec == DS_NO ? US"no"
3337 : US"";
0756eb3c 3338
7cd1141b
PH
3339 /* Set up a string for adding to the retry key if the port number is not
3340 the standard SMTP port. A host may have its own port setting that overrides
3341 the default. */
3342
3343 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3344 port : host->port);
3345 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3346
0756eb3c
PH
3347 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3348 string changes upon expansion, we must add it to the key that is used for
3349 retries, because connections to the same host from a different interface
3350 should be treated separately. */
3351
3352 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3353 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3354 &interface, tid))
3355 return FALSE;
3356 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3357
3358 /* The first time round the outer loop, check the status of the host by
3359 inspecting the retry data. The second time round, we are interested only
3360 in expired hosts that haven't been tried since this message arrived. */
3361
3362 if (cutoff_retry == 0)
3363 {
9c695f6d 3364 BOOL incl_ip;
0756eb3c 3365 /* Ensure the status of the address is set by checking retry data if
9c695f6d 3366 necessary. There may be host-specific retry data (applicable to all
0756eb3c
PH
3367 messages) and also data for retries of a specific message at this host.
3368 If either of these retry records are actually read, the keys used are
3369 returned to save recomputing them later. */
3370
9c695f6d
JH
3371 if (exp_bool(addrlist, US"transport", tblock->name, D_transport,
3372 US"retry_include_ip_address", ob->retry_include_ip_address,
3373 ob->expand_retry_include_ip_address, &incl_ip) != OK)
3374 continue; /* with next host */
3375
0756eb3c 3376 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
9c695f6d 3377 incl_ip, &retry_host_key, &retry_message_key);
0756eb3c
PH
3378
3379 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3380 (host->address == NULL)? US"" : host->address, pistring,
3381 (host->status == hstatus_usable)? "usable" :
3382 (host->status == hstatus_unusable)? "unusable" :
3383 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3384
3385 /* Skip this address if not usable at this time, noting if it wasn't
3386 actually expired, both locally and in the address. */
3387
3388 switch (host->status)
3389 {
3390 case hstatus_unusable:
3391 expired = FALSE;
3392 setflag(addrlist, af_retry_skipped);
3393 /* Fall through */
3394
3395 case hstatus_unusable_expired:
3396 switch (host->why)
3397 {
3398 case hwhy_retry: hosts_retry++; break;
3399 case hwhy_failed: hosts_fail++; break;
3400 case hwhy_deferred: hosts_defer++; break;
3401 }
3402
3403 /* If there was a retry message key, implying that previously there
3404 was a message-specific defer, we don't want to update the list of
f6c332bd 3405 messages waiting for these hosts. */
0756eb3c 3406
f6c332bd 3407 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH
3408 continue; /* With the next host or IP address */
3409 }
3410 }
3411
3412 /* Second time round the loop: if the address is set but expired, and
3413 the message is newer than the last try, let it through. */
3414
3415 else
3416 {
3417 if (host->address == NULL ||
3418 host->status != hstatus_unusable_expired ||
3419 host->last_try > received_time)
3420 continue;
3421 DEBUG(D_transport)
3422 debug_printf("trying expired host %s [%s]%s\n",
3423 host->name, host->address, pistring);
3424 host_is_expired = TRUE;
3425 }
3426
3427 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3428 it remains TRUE only if all hosts are expired and none are actually tried.
3429 */
3430
3431 expired = FALSE;
3432
3433 /* If this host is listed as one to which access must be serialized,
3434 see if another Exim process has a connection to it, and if so, skip
3435 this host. If not, update the database to record our connection to it
3436 and remember this for later deletion. Do not do any of this if we are
3437 sending the message down a pre-existing connection. */
3438
3439 if (!continuing &&
5130845b 3440 verify_check_given_host(&ob->serialize_hosts, host) == OK)
0756eb3c
PH
3441 {
3442 serialize_key = string_sprintf("host-serialize-%s", host->name);
3443 if (!enq_start(serialize_key))
3444 {
3445 DEBUG(D_transport)
3446 debug_printf("skipping host %s because another Exim process "
3447 "is connected to it\n", host->name);
3448 hosts_serial++;
3449 continue;
3450 }
3451 serialized = TRUE;
3452 }
3453
3454 /* OK, we have an IP address that is not waiting for its retry time to
3455 arrive (it might be expired) OR (second time round the loop) we have an
3456 expired host that hasn't been tried since the message arrived. Have a go
3457 at delivering the message to it. First prepare the addresses by flushing
3458 out the result of previous attempts, and finding the first address that
3459 is still to be delivered. */
3460
3461 first_addr = prepare_addresses(addrlist, host);
3462
3463 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3464 message_id, host->name, host->address, addrlist->address,
3465 (addrlist->next == NULL)? "" : ", ...");
3466
3467 set_process_info("delivering %s to %s [%s] (%s%s)",
3468 message_id, host->name, host->address, addrlist->address,
3469 (addrlist->next == NULL)? "" : ", ...");
3470
3471 /* This is not for real; don't do the delivery. If there are
3472 any remaining hosts, list them. */
3473
3474 if (dont_deliver)
3475 {
3476 host_item *host2;
c562fd30 3477 set_errno(addrlist, 0, NULL, OK, FALSE, NULL);
0756eb3c
PH
3478 for (addr = addrlist; addr != NULL; addr = addr->next)
3479 {
3480 addr->host_used = host;
3481 addr->special_action = '*';
3482 addr->message = US"delivery bypassed by -N option";
3483 }
3484 DEBUG(D_transport)
3485 {
3486 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3487 "*** host and remaining hosts:\n", tblock->name);
3488 for (host2 = host; host2 != NULL; host2 = host2->next)
3489 debug_printf(" %s [%s]\n", host2->name,
3490 (host2->address == NULL)? US"unset" : host2->address);
3491 }
3492 rc = OK;
3493 }
3494
3495 /* This is for real. If the host is expired, we don't count it for
3496 hosts_max_retry. This ensures that all hosts must expire before an address
8e669ac1 3497 is timed out, unless hosts_max_try_hardlimit (which protects against
533244af 3498 lunatic DNS configurations) is reached.