Delivery: clarify error log line. Bug 1782
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
80fea873 5/* Copyright (c) University of Cambridge 1995 - 2016 */
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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) }
f0989ec0 162#ifdef SUPPORT_SOCKS
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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 */
f0989ec0 252#ifdef SUPPORT_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 smtp_greeting from peer
444 helo_response from peer
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445
446If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
447the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
448this particular type of timeout.
449
450Returns: nothing
451*/
452
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453static void
454set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
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455 BOOL pass_message, host_item * host
456#ifdef EXPERIMENTAL_DSN_INFO
457 , const uschar * smtp_greeting, const uschar * helo_response
458#endif
459 )
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460{
461address_item *addr;
462int orvalue = 0;
463if (errno_value == ERRNO_CONNECTTIMEOUT)
464 {
465 errno_value = ETIMEDOUT;
466 orvalue = RTEF_CTOUT;
467 }
895fbaf2 468for (addr = addrlist; addr; addr = addr->next)
168dec3b 469 if (addr->transport_return >= PENDING)
447d236c 470 {
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471 addr->basic_errno = errno_value;
472 addr->more_errno |= orvalue;
473 if (msg != NULL)
474 {
475 addr->message = msg;
476 if (pass_message) setflag(addr, af_pass_message);
477 }
478 addr->transport_return = rc;
479 if (host)
895fbaf2 480 {
168dec3b 481 addr->host_used = host;
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482#ifdef EXPERIMENTAL_DSN_INFO
483 if (smtp_greeting)
484 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
485 addr->smtp_greeting = smtp_greeting;
486
487 if (helo_response)
488 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
489 addr->helo_response = helo_response;
490#endif
491 }
447d236c 492 }
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493}
494
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495static void
496set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
497 BOOL pass_message)
498{
499set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
500#ifdef EXPERIMENTAL_DSN_INFO
501 , NULL, NULL
502#endif
503 );
504}
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505
506
507/*************************************************
508* Check an SMTP response *
509*************************************************/
510
511/* This function is given an errno code and the SMTP response buffer
512to analyse, together with the host identification for generating messages. It
513sets an appropriate message and puts the first digit of the response code into
514the yield variable. If no response was actually read, a suitable digit is
515chosen.
516
517Arguments:
447d236c
PH
518 host the current host, to get its name for messages
519 errno_value pointer to the errno value
520 more_errno from the top address for use with ERRNO_FILTER_FAIL
521 buffer the SMTP response buffer
522 yield where to put a one-digit SMTP response code
523 message where to put an errror message
524 pass_message set TRUE if message is an SMTP response
525
526Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
527*/
528
a7538db1
JH
529static BOOL
530check_response(host_item *host, int *errno_value, int more_errno,
447d236c 531 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c
PH
532{
533uschar *pl = US"";
534
535if (smtp_use_pipelining &&
536 (Ustrcmp(smtp_command, "MAIL") == 0 ||
537 Ustrcmp(smtp_command, "RCPT") == 0 ||
538 Ustrcmp(smtp_command, "DATA") == 0))
539 pl = US"pipelined ";
540
541*yield = '4'; /* Default setting is to give a temporary error */
542
543/* Handle response timeout */
544
545if (*errno_value == ETIMEDOUT)
546 {
c562fd30
JH
547 *message = US string_sprintf("SMTP timeout after %s%s",
548 pl, smtp_command);
0756eb3c
PH
549 if (transport_count > 0)
550 *message = US string_sprintf("%s (%d bytes written)", *message,
551 transport_count);
552 return FALSE;
553 }
554
555/* Handle malformed SMTP response */
556
557if (*errno_value == ERRNO_SMTPFORMAT)
558 {
55414b25 559 const uschar *malfresp = string_printing(buffer);
0756eb3c 560 while (isspace(*malfresp)) malfresp++;
c562fd30
JH
561 *message = *malfresp == 0
562 ? string_sprintf("Malformed SMTP reply (an empty line) "
563 "in response to %s%s", pl, smtp_command)
564 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
565 pl, smtp_command, malfresp);
0756eb3c
PH
566 return FALSE;
567 }
568
569/* Handle a failed filter process error; can't send QUIT as we mustn't
570end the DATA. */
571
572if (*errno_value == ERRNO_FILTER_FAIL)
573 {
35af9f61 574 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 575 more_errno,
35af9f61 576 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
577 return FALSE;
578 }
579
580/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
581end the DATA. */
582
583if (*errno_value == ERRNO_CHHEADER_FAIL)
584 {
585 *message =
586 US string_sprintf("failed to expand headers_add or headers_remove: %s",
587 expand_string_message);
588 return FALSE;
589 }
590
591/* Handle failure to write a complete data block */
592
593if (*errno_value == ERRNO_WRITEINCOMPLETE)
594 {
595 *message = US string_sprintf("failed to write a data block");
596 return FALSE;
597 }
598
8c5d388a 599#ifdef SUPPORT_I18N
250b6871
JH
600/* Handle lack of advertised SMTPUTF8, for international message */
601if (*errno_value == ERRNO_UTF8_FWD)
602 {
f358d5e0 603 *message = US string_sprintf("utf8 support required but not offered for forwarding");
250b6871
JH
604 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
605 return TRUE;
606 }
607#endif
608
0756eb3c
PH
609/* Handle error responses from the remote mailer. */
610
611if (buffer[0] != 0)
612 {
55414b25 613 const uschar *s = string_printing(buffer);
447d236c 614 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
c562fd30 615 "%s", pl, smtp_command, s);
447d236c 616 *pass_message = TRUE;
0756eb3c
PH
617 *yield = buffer[0];
618 return TRUE;
619 }
620
621/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
622connection closed) case, which causes deferral. An explicit connection reset
623error has the same effect. Otherwise, put the host's identity in the message,
624leaving the errno value to be interpreted as well. In all cases, we have to
625assume the connection is now dead. */
0756eb3c 626
19b9dc85 627if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
628 {
629 *errno_value = ERRNO_SMTPCLOSED;
c562fd30
JH
630 *message = US string_sprintf("Remote host closed connection "
631 "in response to %s%s", pl, smtp_command);
0756eb3c
PH
632 }
633else *message = US string_sprintf("%s [%s]", host->name, host->address);
634
635return FALSE;
636}
637
638
639
640/*************************************************
641* Write error message to logs *
642*************************************************/
643
644/* This writes to the main log and to the message log.
645
646Arguments:
647 addr the address item containing error information
648 host the current host
649
650Returns: nothing
651*/
652
653static void
654write_logs(address_item *addr, host_item *host)
655{
c562fd30
JH
656uschar * message = string_sprintf("H=%s [%s]", host->name, host->address);
657
1a47b633
JH
658if (LOGGING(outgoing_port))
659 message = string_sprintf("%s:%d", message,
660 host->port == PORT_NONE ? 25 : host->port);
c562fd30 661if (addr->message)
0756eb3c 662 {
c562fd30 663 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
664 if (addr->basic_errno > 0)
665 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
666 log_write(0, LOG_MAIN, "%s", message);
667 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
668 }
669else
670 {
37f3dc43
JH
671 const uschar * s = exim_errstr(addr->basic_errno);
672 log_write(0, LOG_MAIN, "%s %s", message, s);
673 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
0756eb3c
PH
674 }
675}
676
c562fd30
JH
677static void
678msglog_line(host_item * host, uschar * message)
679{
37f3dc43
JH
680deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
681 host->name, host->address, message);
c562fd30
JH
682}
683
0756eb3c
PH
684
685
0cbf2b82 686#ifndef DISABLE_EVENT
d68218c7
JH
687/*************************************************
688* Post-defer action *
689*************************************************/
690
691/* This expands an arbitrary per-transport string.
692 It might, for example, be used to write to the database log.
693
694Arguments:
d68218c7
JH
695 addr the address item containing error information
696 host the current host
697
698Returns: nothing
699*/
700
701static void
774ef2d7 702deferred_event_raise(address_item *addr, host_item *host)
d68218c7 703{
774ef2d7 704uschar * action = addr->transport->event_action;
55414b25 705const uschar * save_domain;
a7538db1
JH
706uschar * save_local;
707
d68218c7 708if (!action)
a7538db1 709 return;
d68218c7 710
a7538db1
JH
711save_domain = deliver_domain;
712save_local = deliver_localpart;
713
714/*XXX would ip & port already be set up? */
715deliver_host_address = string_copy(host->address);
774ef2d7
JH
716deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
717event_defer_errno = addr->basic_errno;
d68218c7
JH
718
719router_name = addr->router->name;
720transport_name = addr->transport->name;
a7538db1
JH
721deliver_domain = addr->domain;
722deliver_localpart = addr->local_part;
723
774ef2d7 724(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
725 addr->message
726 ? addr->basic_errno > 0
727 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
728 : string_copy(addr->message)
729 : addr->basic_errno > 0
730 ? string_copy(US strerror(addr->basic_errno))
731 : NULL);
732
733deliver_localpart = save_local;
734deliver_domain = save_domain;
d68218c7
JH
735router_name = transport_name = NULL;
736}
737#endif
738
0756eb3c
PH
739/*************************************************
740* Synchronize SMTP responses *
741*************************************************/
742
743/* This function is called from smtp_deliver() to receive SMTP responses from
744the server, and match them up with the commands to which they relate. When
745PIPELINING is not in use, this function is called after every command, and is
746therefore somewhat over-engineered, but it is simpler to use a single scheme
747that works both with and without PIPELINING instead of having two separate sets
748of code.
749
750The set of commands that are buffered up with pipelining may start with MAIL
751and may end with DATA; in between are RCPT commands that correspond to the
752addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
753etc.) are never buffered.
754
755Errors after MAIL or DATA abort the whole process leaving the response in the
756buffer. After MAIL, pending responses are flushed, and the original command is
757re-instated in big_buffer for error messages. For RCPT commands, the remote is
758permitted to reject some recipient addresses while accepting others. However
759certain errors clearly abort the whole process. Set the value in
760transport_return to PENDING_OK if the address is accepted. If there is a
761subsequent general error, it will get reset accordingly. If not, it will get
762converted to OK at the end.
763
764Arguments:
48c7f9e2
PH
765 addrlist the complete address list
766 include_affixes TRUE if affixes include in RCPT
767 sync_addr ptr to the ptr of the one to start scanning at (updated)
768 host the host we are connected to
769 count the number of responses to read
770 address_retry_
771 include_sender true if 4xx retry is to include the sender it its key
772 pending_MAIL true if the first response is for MAIL
773 pending_DATA 0 if last command sent was not DATA
774 +1 if previously had a good recipient
775 -1 if not previously had a good recipient
776 inblock incoming SMTP block
777 timeout timeout value
778 buffer buffer for reading response
779 buffsize size of buffer
0756eb3c
PH
780
781Returns: 3 if at least one address had 2xx and one had 5xx
782 2 if at least one address had 5xx but none had 2xx
783 1 if at least one host had a 2xx response, but none had 5xx
784 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
785 -1 timeout while reading RCPT response
786 -2 I/O or other non-response error for RCPT
787 -3 DATA or MAIL failed - errno and buffer set
788*/
789
790static int
791sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
792 address_item **sync_addr, host_item *host, int count,
793 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
794 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
795 int buffsize)
796{
797address_item *addr = *sync_addr;
798int yield = 0;
799
800/* Handle the response for a MAIL command. On error, reinstate the original
801command in big_buffer for error message use, and flush any further pending
802responses before returning, except after I/O errors and timeouts. */
803
804if (pending_MAIL)
805 {
806 count--;
807 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
808 {
809 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
810 if (errno == 0 && buffer[0] != 0)
811 {
812 uschar flushbuffer[4096];
e97957bc
PH
813 int save_errno = 0;
814 if (buffer[0] == '4')
815 {
816 save_errno = ERRNO_MAIL4XX;
817 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
818 }
0756eb3c
PH
819 while (count-- > 0)
820 {
821 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
822 '2', timeout)
823 && (errno != 0 || flushbuffer[0] == 0))
824 break;
825 }
e97957bc 826 errno = save_errno;
0756eb3c 827 }
c562fd30
JH
828
829 if (pending_DATA) count--; /* Number of RCPT responses to come */
830 while (count-- > 0) /* Mark any pending addrs with the host used */
831 {
832 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
833 addr->host_used = host;
834 addr = addr->next;
835 }
0756eb3c
PH
836 return -3;
837 }
838 }
839
840if (pending_DATA) count--; /* Number of RCPT responses to come */
841
842/* Read and handle the required number of RCPT responses, matching each one up
843with an address by scanning for the next address whose status is PENDING_DEFER.
844*/
845
846while (count-- > 0)
847 {
848 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
849
850 /* The address was accepted */
c562fd30 851 addr->host_used = host;
0756eb3c
PH
852
853 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
854 {
855 yield |= 1;
856 addr->transport_return = PENDING_OK;
857
858 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
859 ensure that any address-specific retry record is expunged. We do this both
860 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
861
862 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
863 {
864 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
865 sender_address);
866 retry_add_item(addr, altkey, rf_delete);
0756eb3c 867 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 868 }
0756eb3c
PH
869 }
870
871 /* Timeout while reading the response */
872
873 else if (errno == ETIMEDOUT)
874 {
c562fd30
JH
875 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
876 transport_rcpt_address(addr, include_affixes));
895fbaf2 877 set_errno_nohost(addrlist, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 878 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 879 update_waiting = FALSE;
0756eb3c
PH
880 return -1;
881 }
882
883 /* Handle other errors in obtaining an SMTP response by returning -1. This
884 will cause all the addresses to be deferred. Restore the SMTP command in
885 big_buffer for which we are checking the response, so the error message
886 makes sense. */
887
888 else if (errno != 0 || buffer[0] == 0)
889 {
890 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
891 transport_rcpt_address(addr, include_affixes));
892 return -2;
893 }
894
895 /* Handle SMTP permanent and temporary response codes. */
896
897 else
898 {
899 addr->message =
447d236c 900 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
c562fd30
JH
901 "%s", transport_rcpt_address(addr, include_affixes),
902 string_printing(buffer));
447d236c 903 setflag(addr, af_pass_message);
c562fd30 904 msglog_line(host, addr->message);
0756eb3c
PH
905
906 /* The response was 5xx */
907
908 if (buffer[0] == '5')
909 {
910 addr->transport_return = FAIL;
911 yield |= 2;
912 }
913
914 /* The response was 4xx */
915
916 else
917 {
0756eb3c
PH
918 addr->transport_return = DEFER;
919 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 920 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c 921
0cbf2b82 922#ifndef DISABLE_EVENT
5ef5dd52
JB
923 event_defer_errno = addr->more_errno;
924 msg_event_raise(US"msg:rcpt:host:defer", addr);
925#endif
926
c562fd30
JH
927 /* Log temporary errors if there are more hosts to be tried.
928 If not, log this last one in the == line. */
0756eb3c 929
c562fd30
JH
930 if (host->next)
931 log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message);
0756eb3c 932
0cbf2b82 933#ifndef DISABLE_EVENT
5ef5dd52
JB
934 else
935 msg_event_raise(US"msg:rcpt:defer", addr);
936#endif
937
f6c332bd
PH
938 /* Do not put this message on the list of those waiting for specific
939 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 940
f6c332bd 941 update_waiting = FALSE;
0756eb3c 942
48c7f9e2
PH
943 /* Add a retry item for the address so that it doesn't get tried again
944 too soon. If address_retry_include_sender is true, add the sender address
945 to the retry key. */
0756eb3c 946
48c7f9e2
PH
947 if (address_retry_include_sender)
948 {
949 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
950 sender_address);
951 retry_add_item(addr, altkey, 0);
952 }
953 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
954 }
955 }
956 } /* Loop for next RCPT response */
957
958/* Update where to start at for the next block of responses, unless we
959have already handled all the addresses. */
960
961if (addr != NULL) *sync_addr = addr->next;
962
963/* Handle a response to DATA. If we have not had any good recipients, either
964previously or in this block, the response is ignored. */
965
966if (pending_DATA != 0 &&
967 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
968 {
969 int code;
970 uschar *msg;
447d236c 971 BOOL pass_message;
e97957bc
PH
972 if (pending_DATA > 0 || (yield & 1) != 0)
973 {
974 if (errno == 0 && buffer[0] == '4')
975 {
976 errno = ERRNO_DATA4XX;
977 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
978 }
979 return -3;
980 }
447d236c 981 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
982 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
983 "is in use and there were no good recipients\n", msg);
984 }
985
986/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
987present) received 3xx. If any RCPTs were handled and yielded anything other
988than 4xx, yield will be set non-zero. */
989
990return yield;
991}
992
993
994
fcc8e047
JH
995/* Do the client side of smtp-level authentication */
996/*
997Arguments:
998 buffer EHLO response from server (gets overwritten)
999 addrlist chain of potential addresses to deliver
1000 host host to deliver to
1001 ob transport options
1002 ibp, obp comms channel control blocks
1003
1004Returns:
1005 OK Success, or failed (but not required): global "smtp_authenticated" set
1006 DEFER Failed authentication (and was required)
1007 ERROR Internal problem
1008
1009 FAIL_SEND Failed communications - transmit
1010 FAIL - response
1011*/
1012
1013int
1014smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
1015 smtp_transport_options_block *ob, BOOL is_esmtp,
1016 smtp_inblock *ibp, smtp_outblock *obp)
1017{
a7538db1
JH
1018int require_auth;
1019uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 1020
a7538db1
JH
1021smtp_authenticated = FALSE;
1022client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 1023require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 1024
a7538db1
JH
1025if (is_esmtp && !regex_AUTH) regex_AUTH =
1026 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1027 FALSE, TRUE);
fcc8e047 1028
a7538db1
JH
1029if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1030 {
1031 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1032 expand_nmax = -1; /* reset */
fcc8e047 1033
a7538db1
JH
1034 /* Must not do this check until after we have saved the result of the
1035 regex match above. */
fcc8e047 1036
a7538db1 1037 if (require_auth == OK ||
5130845b 1038 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
1039 {
1040 auth_instance *au;
1041 fail_reason = US"no common mechanisms were found";
fcc8e047 1042
a7538db1 1043 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1044
a7538db1
JH
1045 /* Scan the configured authenticators looking for one which is configured
1046 for use as a client, which is not suppressed by client_condition, and
1047 whose name matches an authentication mechanism supported by the server.
1048 If one is found, attempt to authenticate by calling its client function.
1049 */
fcc8e047 1050
a7538db1
JH
1051 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1052 {
1053 uschar *p = names;
1054 if (!au->client ||
1055 (au->client_condition != NULL &&
1056 !expand_check_condition(au->client_condition, au->name,
1057 US"client authenticator")))
1058 {
1059 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1060 au->name,
1061 (au->client)? "client_condition is false" :
1062 "not configured as a client");
1063 continue;
1064 }
fcc8e047 1065
a7538db1 1066 /* Loop to scan supported server mechanisms */
fcc8e047 1067
a7538db1
JH
1068 while (*p != 0)
1069 {
1070 int rc;
1071 int len = Ustrlen(au->public_name);
1072 while (isspace(*p)) p++;
fcc8e047 1073
a7538db1
JH
1074 if (strncmpic(au->public_name, p, len) != 0 ||
1075 (p[len] != 0 && !isspace(p[len])))
1076 {
1077 while (*p != 0 && !isspace(*p)) p++;
1078 continue;
1079 }
fcc8e047 1080
a7538db1
JH
1081 /* Found data for a listed mechanism. Call its client entry. Set
1082 a flag in the outblock so that data is overwritten after sending so
1083 that reflections don't show it. */
fcc8e047 1084
a7538db1
JH
1085 fail_reason = US"authentication attempt(s) failed";
1086 obp->authenticating = TRUE;
1087 rc = (au->info->clientcode)(au, ibp, obp,
1088 ob->command_timeout, buffer, bufsize);
1089 obp->authenticating = FALSE;
1090 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1091 au->name, rc);
fcc8e047 1092
a7538db1
JH
1093 /* A temporary authentication failure must hold up delivery to
1094 this host. After a permanent authentication failure, we carry on
1095 to try other authentication methods. If all fail hard, try to
1096 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1097
a7538db1
JH
1098 switch(rc)
1099 {
1100 case OK:
1101 smtp_authenticated = TRUE; /* stops the outer loop */
1102 client_authenticator = au->name;
1103 if (au->set_client_id != NULL)
1104 client_authenticated_id = expand_string(au->set_client_id);
1105 break;
1106
1107 /* Failure after writing a command */
1108
1109 case FAIL_SEND:
1110 return FAIL_SEND;
1111
1112 /* Failure after reading a response */
1113
1114 case FAIL:
1115 if (errno != 0 || buffer[0] != '5') return FAIL;
1116 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1117 au->name, host->name, host->address, buffer);
1118 break;
1119
1120 /* Failure by some other means. In effect, the authenticator
1121 decided it wasn't prepared to handle this case. Typically this
1122 is the result of "fail" in an expansion string. Do we need to
1123 log anything here? Feb 2006: a message is now put in the buffer
1124 if logging is required. */
1125
1126 case CANCELLED:
1127 if (*buffer != 0)
1128 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1129 "authentication H=%s [%s] %s", au->name, host->name,
1130 host->address, buffer);
1131 break;
1132
1133 /* Internal problem, message in buffer. */
1134
1135 case ERROR:
895fbaf2
JH
1136 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1137 DEFER, FALSE);
a7538db1
JH
1138 return ERROR;
1139 }
fcc8e047 1140
a7538db1
JH
1141 break; /* If not authenticated, try next authenticator */
1142 } /* Loop for scanning supported server mechanisms */
1143 } /* Loop for further authenticators */
fcc8e047 1144 }
a7538db1 1145 }
fcc8e047 1146
a7538db1 1147/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1148
a7538db1
JH
1149if (require_auth == OK && !smtp_authenticated)
1150 {
895fbaf2 1151 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1152 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1153 FALSE);
a7538db1
JH
1154 return DEFER;
1155 }
4d8d62b9 1156
a7538db1 1157return OK;
fcc8e047
JH
1158}
1159
1160
1161/* Construct AUTH appendix string for MAIL TO */
1162/*
1163Arguments
1164 buffer to build string
1165 addrlist chain of potential addresses to deliver
1166 ob transport options
1167
1168Globals smtp_authenticated
1169 client_authenticated_sender
1170Return True on error, otherwise buffer has (possibly empty) terminated string
1171*/
1172
1173BOOL
1174smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1175 smtp_transport_options_block *ob)
1176{
1177uschar *local_authenticated_sender = authenticated_sender;
1178
1179#ifdef notdef
1180 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1181#endif
1182
1183if (ob->authenticated_sender != NULL)
1184 {
1185 uschar *new = expand_string(ob->authenticated_sender);
1186 if (new == NULL)
1187 {
1188 if (!expand_string_forcedfail)
1189 {
1190 uschar *message = string_sprintf("failed to expand "
1191 "authenticated_sender: %s", expand_string_message);
895fbaf2 1192 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH
1193 return TRUE;
1194 }
1195 }
1196 else if (new[0] != 0) local_authenticated_sender = new;
1197 }
1198
1199/* Add the authenticated sender address if present */
1200
1201if ((smtp_authenticated || ob->authenticated_sender_force) &&
1202 local_authenticated_sender != NULL)
1203 {
1204 string_format(buffer, bufsize, " AUTH=%s",
1205 auth_xtextencode(local_authenticated_sender,
1206 Ustrlen(local_authenticated_sender)));
1207 client_authenticated_sender = string_copy(local_authenticated_sender);
1208 }
1209else
1210 *buffer= 0;
1211
1212return FALSE;
1213}
1214
1215
1216
0e66b3b6 1217#ifdef EXPERIMENTAL_DANE
2d5fdd53
JH
1218/* Lookup TLSA record for host/port.
1219Return: OK success with dnssec; DANE mode
1220 DEFER Do not use this host now, may retry later
1221 FAIL_FORCED No TLSA record; DANE not usable
1222 FAIL Do not use this connection
1223*/
1224
0e66b3b6 1225int
4b0fe319 1226tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
0e66b3b6
JH
1227{
1228/* move this out to host.c given the similarity to dns_lookup() ? */
1229uschar buffer[300];
55414b25 1230const uschar * fullname = buffer;
0e66b3b6
JH
1231
1232/* TLSA lookup string */
1233(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1234
1235switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1236 {
0e66b3b6
JH
1237 case DNS_SUCCEED:
1238 if (!dns_is_secure(dnsa))
1239 {
1240 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1241 return DEFER;
1242 }
4b0fe319 1243 return OK;
2d5fdd53
JH
1244
1245 case DNS_AGAIN:
1246 return DEFER; /* just defer this TLS'd conn */
1247
1248 case DNS_NOMATCH:
1249 return dane_required ? FAIL : FAIL_FORCED;
1250
1251 default:
1252 case DNS_FAIL:
1253 return dane_required ? FAIL : DEFER;
0e66b3b6 1254 }
0e66b3b6
JH
1255}
1256#endif
1257
1258
a39bd74d
JB
1259
1260typedef struct smtp_compare_s
1261{
1262 uschar *current_sender_address;
1263 struct transport_instance *tblock;
1264} smtp_compare_t;
1265
1266/*
1267Create a unique string that identifies this message, it is based on
1268sender_address, helo_data and tls_certificate if enabled. */
1269
1270static uschar *
1271smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1272{
1273address_item * addr1;
1274uschar * if1 = US"";
1275uschar * helo1 = US"";
1276#ifdef SUPPORT_TLS
1277uschar * tlsc1 = US"";
1278#endif
1279uschar * save_sender_address = sender_address;
1280uschar * local_identity = NULL;
1281smtp_transport_options_block * ob =
1282 (smtp_transport_options_block *)tblock->options_block;
1283
1284sender_address = sender;
1285
1286addr1 = deliver_make_addr (sender, TRUE);
1287deliver_set_expansions(addr1);
1288
1289if (ob->interface)
1290 if1 = expand_string(ob->interface);
1291
1292if (ob->helo_data)
1293 helo1 = expand_string(ob->helo_data);
1294
1295#ifdef SUPPORT_TLS
1296if (ob->tls_certificate)
1297 tlsc1 = expand_string(ob->tls_certificate);
1298local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1299#else
1300local_identity = string_sprintf ("%s^%s", if1, helo1);
1301#endif
1302
1303deliver_set_expansions(NULL);
1304sender_address = save_sender_address;
1305
1306return local_identity;
1307}
1308
1309
1310
1311/* This routine is a callback that is called from transport_check_waiting.
1312This function will evaluate the incoming message versus the previous
1313message. If the incoming message is using a different local identity then
1314we will veto this new message. */
1315
1316static BOOL
1317smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1318{
dadff1d4
HSHR
1319uschar * message_local_identity,
1320 * current_local_identity,
1321 * new_sender_address;
1322
1323current_local_identity =
a39bd74d 1324 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1325
dadff1d4
HSHR
1326if (!(new_sender_address = deliver_get_sender_address(message_id)))
1327 return 0;
1328
1329message_local_identity =
1330 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1331
1332return Ustrcmp(current_local_identity, message_local_identity) == 0;
1333}
1334
1335
1336
9094b84b
JH
1337uschar
1338ehlo_response(uschar * buf, size_t bsize, uschar checks)
1339{
1340#ifdef SUPPORT_TLS
1341if (checks & PEER_OFFERED_TLS)
1342 if (pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1343 checks &= ~PEER_OFFERED_TLS;
1344#endif
1345
1346 if ( checks & PEER_OFFERED_IGNQ
1347 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1348 PCRE_EOPT, NULL, 0) < 0)
1349 checks &= ~PEER_OFFERED_IGNQ;
1350
1351#ifndef DISABLE_PRDR
1352 if ( checks & PEER_OFFERED_PRDR
1353 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1354 checks &= ~PEER_OFFERED_PRDR;
1355#endif
1356
1357#ifdef SUPPORT_I18N
1358 if ( checks & PEER_OFFERED_UTF8
1359 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1360 checks &= ~PEER_OFFERED_UTF8;
1361#endif
1362
1363 if ( checks & PEER_OFFERED_DSN
1364 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1365 checks &= ~PEER_OFFERED_DSN;
1366
1367 if ( checks & PEER_OFFERED_PIPE
1368 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1369 PCRE_EOPT, NULL, 0) < 0)
1370 checks &= ~PEER_OFFERED_PIPE;
1371
1372 if ( checks & PEER_OFFERED_SIZE
1373 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1374 checks &= ~PEER_OFFERED_SIZE;
1375
1376return checks;
1377}
1378
1379
0756eb3c
PH
1380/*************************************************
1381* Deliver address list to given host *
1382*************************************************/
1383
1384/* If continue_hostname is not null, we get here only when continuing to
1385deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1386input. TLS is never active on a passed channel; the previous process always
1387closes it down before passing the connection on.
0756eb3c
PH
1388
1389Otherwise, we have to make a connection to the remote host, and do the
1390initial protocol exchange.
1391
1392When running as an MUA wrapper, if the sender or any recipient is rejected,
1393temporarily or permanently, we force failure for all recipients.
1394
1395Arguments:
1396 addrlist chain of potential addresses to deliver; only those whose
1397 transport_return field is set to PENDING_DEFER are currently
1398 being processed; others should be skipped - they have either
1399 been delivered to an earlier host or IP address, or been
1400 failed by one of them.
1401 host host to deliver to
1402 host_af AF_INET or AF_INET6
2d280592 1403 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1404 interface interface to bind to, or NULL
1405 tblock transport instance block
0756eb3c
PH
1406 message_defer set TRUE if yield is OK, but all addresses were deferred
1407 because of a non-recipient, non-host failure, that is, a
1408 4xx response to MAIL FROM, DATA, or ".". This is a defer
1409 that is specific to the message.
1410 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1411 a second attempt after TLS initialization fails
1412
1413Returns: OK - the connection was made and the delivery attempted;
1414 the result for each address is in its data block.
1415 DEFER - the connection could not be made, or something failed
1416 while setting up the SMTP session, or there was a
1417 non-message-specific error, such as a timeout.
1418 ERROR - a filter command is specified for this transport,
1419 and there was a problem setting it up; OR helo_data
1420 or add_headers or authenticated_sender is specified
1421 for this transport, and the string failed to expand
1422*/
1423
1424static int
1425smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
d427a7f9 1426 uschar *interface, transport_instance *tblock,
0756eb3c
PH
1427 BOOL *message_defer, BOOL suppress_tls)
1428{
1429address_item *addr;
1430address_item *sync_addr;
1431address_item *first_addr = addrlist;
1432int yield = OK;
1433int address_count;
1434int save_errno;
1435int rc;
1436time_t start_delivery_time = time(NULL);
1437smtp_transport_options_block *ob =
1438 (smtp_transport_options_block *)(tblock->options_block);
1439BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1440BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1441BOOL ok = FALSE;
1442BOOL send_rset = TRUE;
1443BOOL send_quit = TRUE;
1444BOOL setting_up = TRUE;
1445BOOL completed_address = FALSE;
1446BOOL esmtp = TRUE;
1447BOOL pending_MAIL;
447d236c 1448BOOL pass_message = FALSE;
9094b84b 1449uschar peer_offered = 0; /*XXX should this be handed on cf. tls_offered, smtp_use_dsn ? */
8ccd00b1 1450#ifndef DISABLE_PRDR
fd98a5c6
JH
1451BOOL prdr_active;
1452#endif
8c5d388a 1453#ifdef SUPPORT_I18N
3c8b3577 1454BOOL utf8_needed = FALSE;
7ade712c 1455#endif
6c1c3d1d 1456BOOL dsn_all_lasthop = TRUE;
0e66b3b6
JH
1457#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1458BOOL dane = FALSE;
0539a19d 1459BOOL dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK;
0e66b3b6
JH
1460dns_answer tlsa_dnsa;
1461#endif
0756eb3c
PH
1462smtp_inblock inblock;
1463smtp_outblock outblock;
1464int max_rcpt = tblock->max_addresses;
f1513293 1465uschar *igquotstr = US"";
a39bd74d 1466
895fbaf2
JH
1467#ifdef EXPERIMENTAL_DSN_INFO
1468uschar *smtp_greeting = NULL;
1469uschar *helo_response = NULL;
1470#endif
41c7c167 1471uschar *helo_data = NULL;
a39bd74d 1472
0756eb3c
PH
1473uschar *message = NULL;
1474uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1475uschar *p;
1476uschar buffer[4096];
1477uschar inbuffer[4096];
98470202 1478uschar outbuffer[4096];
0756eb3c
PH
1479
1480suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1481
1482*message_defer = FALSE;
1483smtp_command = US"initial connection";
1484if (max_rcpt == 0) max_rcpt = 999999;
1485
1486/* Set up the buffer for reading SMTP response packets. */
1487
1488inblock.buffer = inbuffer;
1489inblock.buffersize = sizeof(inbuffer);
1490inblock.ptr = inbuffer;
1491inblock.ptrend = inbuffer;
1492
1493/* Set up the buffer for holding SMTP commands while pipelining */
1494
1495outblock.buffer = outbuffer;
1496outblock.buffersize = sizeof(outbuffer);
1497outblock.ptr = outbuffer;
1498outblock.cmd_count = 0;
1499outblock.authenticating = FALSE;
1500
6c512171
PH
1501/* Reset the parameters of a TLS session. */
1502
817d9f57
JH
1503tls_out.bits = 0;
1504tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1505tls_out.ourcert = NULL;
1506tls_out.peercert = NULL;
817d9f57
JH
1507tls_out.peerdn = NULL;
1508#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1509tls_out.sni = NULL;
5b456975 1510#endif
018058b2 1511tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1512
35aba663
JH
1513/* Flip the legacy TLS-related variables over to the outbound set in case
1514they're used in the context of the transport. Don't bother resetting
1515afterward as we're in a subprocess. */
1516
1517tls_modify_variables(&tls_out);
1518
061b7ebd
PP
1519#ifndef SUPPORT_TLS
1520if (smtps)
1521 {
895fbaf2
JH
1522 set_errno_nohost(addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
1523 DEFER, FALSE);
018058b2 1524 return ERROR;
061b7ebd
PP
1525 }
1526#endif
1527
0756eb3c
PH
1528/* Make a connection to the host if this isn't a continued delivery, and handle
1529the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1530specially so they can be identified for retries. */
1531
1532if (continue_hostname == NULL)
1533 {
a7538db1 1534 /* This puts port into host->port */
0756eb3c 1535 inblock.sock = outblock.sock =
7eb6c37c 1536 smtp_connect(host, host_af, port, interface, ob->connect_timeout, tblock);
4311097e 1537
0756eb3c
PH
1538 if (inblock.sock < 0)
1539 {
895fbaf2
JH
1540 set_errno_nohost(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
1541 NULL, DEFER, FALSE);
0756eb3c
PH
1542 return DEFER;
1543 }
1544
0e66b3b6
JH
1545#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1546 {
0e66b3b6
JH
1547 tls_out.dane_verified = FALSE;
1548 tls_out.tlsa_usage = 0;
1549
0e66b3b6
JH
1550 if (host->dnssec == DS_YES)
1551 {
4b0fe319
JH
1552 if( dane_required
1553 || verify_check_given_host(&ob->hosts_try_dane, host) == OK
0e66b3b6 1554 )
2d5fdd53 1555 switch (rc = tlsa_lookup(host, &tlsa_dnsa, dane_required))
4b0fe319 1556 {
2d5fdd53
JH
1557 case OK: dane = TRUE; break;
1558 case FAIL_FORCED: break;
1559 default: set_errno_nohost(addrlist, ERRNO_DNSDEFER,
1560 string_sprintf("DANE error: tlsa lookup %s",
1561 rc == DEFER ? "DEFER" : "FAIL"),
1562 rc, FALSE);
1563 return rc;
4b0fe319 1564 }
0e66b3b6
JH
1565 }
1566 else if (dane_required)
1567 {
895fbaf2 1568 set_errno_nohost(addrlist, ERRNO_DNSDEFER,
4cea764f 1569 string_sprintf("DANE error: %s lookup not DNSSEC", host->name),
895fbaf2 1570 FAIL, FALSE);
4b0fe319 1571 return FAIL;
0e66b3b6
JH
1572 }
1573
1574 if (dane)
1575 ob->tls_tempfail_tryclear = FALSE;
1576 }
1577#endif /*DANE*/
1578
41c7c167
PH
1579 /* Expand the greeting message while waiting for the initial response. (Makes
1580 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1581 delayed till here so that $sending_interface and $sending_port are set. */
1582
1583 helo_data = expand_string(ob->helo_data);
8c5d388a 1584#ifdef SUPPORT_I18N
810d16ad
JH
1585 if (helo_data)
1586 {
1587 uschar * errstr = NULL;
1588 if ((helo_data = string_domain_utf8_to_alabel(helo_data, &errstr)), errstr)
1589 {
1590 errstr = string_sprintf("failed to expand helo_data: %s", errstr);
895fbaf2 1591 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
810d16ad
JH
1592 yield = DEFER;
1593 goto SEND_QUIT;
1594 }
1595 }
1596#endif
41c7c167 1597
0756eb3c
PH
1598 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1599 is nevertheless a reasonably clean way of programming this kind of logic,
1600 where you want to escape on any error. */
1601
061b7ebd
PP
1602 if (!smtps)
1603 {
895fbaf2
JH
1604 BOOL good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1605 '2', ob->command_timeout);
1606#ifdef EXPERIMENTAL_DSN_INFO
1607 smtp_greeting = string_copy(buffer);
1608#endif
1609 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1610
0cbf2b82 1611#ifndef DISABLE_EVENT
b30275b8 1612 {
805c9d53
JH
1613 uschar * s;
1614 lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes"
1615 : host->dnssec==DS_NO ? US"no" : NULL;
1616 s = event_raise(tblock->event_action, US"smtp:connect", buffer);
b30275b8 1617 if (s)
a7538db1 1618 {
895fbaf2 1619 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL,
b30275b8 1620 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1621 DEFER, FALSE);
a7538db1
JH
1622 yield = DEFER;
1623 goto SEND_QUIT;
1624 }
b30275b8 1625 }
a7538db1
JH
1626#endif
1627
061b7ebd
PP
1628 /* Now check if the helo_data expansion went well, and sign off cleanly if
1629 it didn't. */
41c7c167 1630
061b7ebd
PP
1631 if (helo_data == NULL)
1632 {
1633 uschar *message = string_sprintf("failed to expand helo_data: %s",
1634 expand_string_message);
895fbaf2 1635 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP
1636 yield = DEFER;
1637 goto SEND_QUIT;
1638 }
41c7c167
PH
1639 }
1640
0756eb3c
PH
1641/** Debugging without sending a message
1642addrlist->transport_return = DEFER;
1643goto SEND_QUIT;
1644**/
1645
1646 /* Errors that occur after this point follow an SMTP command, which is
1647 left in big_buffer by smtp_write_command() for use in error messages. */
1648
1649 smtp_command = big_buffer;
1650
1651 /* Tell the remote who we are...
1652
1653 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1654 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1655 greeting is of this form. The assumption was that the far end supports it
1656 properly... but experience shows that there are some that give 5xx responses,
1657 even though the banner includes "ESMTP" (there's a bloody-minded one that
1658 says "ESMTP not spoken here"). Cope with that case.
1659
1660 September 2000: Time has passed, and it seems reasonable now to always send
1661 EHLO at the start. It is also convenient to make the change while installing
1662 the TLS stuff.
1663
1664 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1665 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1666 would be no way to send out the mails, so there is now a host list
1667 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1668 PIPELINING problem as well. Maybe it can also be useful to cure other
1669 problems with broken servers.
1670
1671 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1672 Then somebody tried it with a Microsoft mailer... It seems that all other
1673 mailers use upper case for some reason (the RFC is quite clear about case
1674 independence) so, for peace of mind, I gave in. */
1675
5130845b 1676 esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK;
0756eb3c 1677
061b7ebd
PP
1678 /* Alas; be careful, since this goto is not an error-out, so conceivably
1679 we might set data between here and the target which we assume to exist
1680 and be usable. I can see this coming back to bite us. */
a7538db1 1681#ifdef SUPPORT_TLS
061b7ebd
PP
1682 if (smtps)
1683 {
1684 tls_offered = TRUE;
1685 suppress_tls = FALSE;
1686 ob->tls_tempfail_tryclear = FALSE;
1687 smtp_command = US"SSL-on-connect";
1688 goto TLS_NEGOTIATE;
1689 }
a7538db1 1690#endif
061b7ebd 1691
0756eb3c
PH
1692 if (esmtp)
1693 {
1694 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1695 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1696 goto SEND_FAILED;
1697 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1698 ob->command_timeout))
1699 {
895fbaf2
JH
1700 if (errno != 0 || buffer[0] == 0 || lmtp)
1701 {
1702#ifdef EXPERIMENTAL_DSN_INFO
1703 helo_response = string_copy(buffer);
1704#endif
1705 goto RESPONSE_FAILED;
1706 }
0756eb3c
PH
1707 esmtp = FALSE;
1708 }
895fbaf2
JH
1709#ifdef EXPERIMENTAL_DSN_INFO
1710 helo_response = string_copy(buffer);
1711#endif
0756eb3c
PH
1712 }
1713 else
1714 {
1715 DEBUG(D_transport)
1716 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1717 }
1718
1719 if (!esmtp)
1720 {
895fbaf2
JH
1721 BOOL good_response;
1722
0756eb3c
PH
1723 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1724 goto SEND_FAILED;
895fbaf2
JH
1725 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1726 '2', ob->command_timeout);
1727#ifdef EXPERIMENTAL_DSN_INFO
1728 helo_response = string_copy(buffer);
1729#endif
1730 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH
1731 }
1732
9094b84b
JH
1733 if (esmtp || lmtp)
1734 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1735 PEER_OFFERED_TLS
1736 | 0 /* IGNQ checked later */
1737 | 0 /* PRDR checked later */
1738 | 0 /* UTF8 checked later */
1739 | 0 /* DSN checked later */
1740 | 0 /* PIPE checked later */
1741 | 0 /* SIZE checked later */
1742 );
f1513293 1743
0756eb3c
PH
1744 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1745
a7538db1 1746#ifdef SUPPORT_TLS
9094b84b 1747 tls_offered = !!(peer_offered & PEER_OFFERED_TLS);
7ade712c 1748#endif
0756eb3c
PH
1749 }
1750
1751/* For continuing deliveries down the same channel, the socket is the standard
1752input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1753below). Set up the pointer to where subsequent commands will be left, for
1754error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1755set from the command line if they were set in the process that passed the
1756connection on. */
1757
895fbaf2
JH
1758/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
1759as the contine goes via transport_pass_socket() and doublefork and exec.
1760It does not wait. Unclear how we keep separate host's responses
1761separate - we could match up by host ip+port as a bodge. */
1762
0756eb3c
PH
1763else
1764 {
1765 inblock.sock = outblock.sock = fileno(stdin);
1766 smtp_command = big_buffer;
4311097e 1767 host->port = port; /* Record the port that was used */
0756eb3c
PH
1768 }
1769
1770/* If TLS is available on this connection, whether continued or not, attempt to
1771start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1772send another EHLO - the server may give a different answer in secure mode. We
1773use a separate buffer for reading the response to STARTTLS so that if it is
1774negative, the original EHLO data is available for subsequent analysis, should
1775the client not be required to use TLS. If the response is bad, copy the buffer
1776for error analysis. */
1777
1778#ifdef SUPPORT_TLS
5130845b
JH
1779if ( tls_offered
1780 && !suppress_tls
1781 && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK)
0756eb3c
PH
1782 {
1783 uschar buffer2[4096];
1784 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1785 goto SEND_FAILED;
1786
1787 /* If there is an I/O error, transmission of this message is deferred. If
1788 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1789 false, we also defer. However, if there is a temporary rejection of STARTTLS
1790 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1791 STARTTLS, we carry on. This means we will try to send the message in clear,
1792 unless the host is in hosts_require_tls (tested below). */
1793
1794 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1795 ob->command_timeout))
1796 {
4b0fe319
JH
1797 if ( errno != 0
1798 || buffer2[0] == 0
1799 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
1800 )
0dda4340
TK
1801 {
1802 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1803 goto RESPONSE_FAILED;
0dda4340 1804 }
0756eb3c
PH
1805 }
1806
1807 /* STARTTLS accepted: try to negotiate a TLS session. */
1808
1809 else
061b7ebd 1810 TLS_NEGOTIATE:
0756eb3c 1811 {
0e66b3b6
JH
1812 int rc = tls_client_start(inblock.sock, host, addrlist, tblock
1813# ifdef EXPERIMENTAL_DANE
1814 , dane ? &tlsa_dnsa : NULL
1815# endif
1816 );
0756eb3c
PH
1817
1818 /* TLS negotiation failed; give an error. From outside, this function may
1819 be called again to try in clear on a new connection, if the options permit
1820 it for this host. */
1821
1822 if (rc != OK)
1823 {
6ebd79ec 1824# ifdef EXPERIMENTAL_DANE
4b0fe319 1825 if (rc == DEFER && dane)
6ebd79ec 1826 {
4b0fe319
JH
1827 log_write(0, LOG_MAIN,
1828 "DANE attempt failed; no TLS connection to %s [%s]",
6ebd79ec 1829 host->name, host->address);
6ebd79ec
JH
1830 }
1831# endif
1832
0756eb3c
PH
1833 save_errno = ERRNO_TLSFAILURE;
1834 message = US"failure while setting up TLS session";
1835 send_quit = FALSE;
1836 goto TLS_FAILED;
1837 }
1838
1839 /* TLS session is set up */
1840
895fbaf2 1841 for (addr = addrlist; addr; addr = addr->next)
5ca2a9a1
PH
1842 if (addr->transport_return == PENDING_DEFER)
1843 {
817d9f57 1844 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1845 addr->ourcert = tls_out.ourcert;
1846 addr->peercert = tls_out.peercert;
817d9f57 1847 addr->peerdn = tls_out.peerdn;
018058b2 1848 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1849 }
0756eb3c
PH
1850 }
1851 }
1852
061b7ebd
PP
1853/* if smtps, we'll have smtp_command set to something else; always safe to
1854reset it here. */
1855smtp_command = big_buffer;
1856
41c7c167
PH
1857/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1858helo_data is null, we are dealing with a connection that was passed from
1859another process, and so we won't have expanded helo_data above. We have to
1860expand it here. $sending_ip_address and $sending_port are set up right at the
1861start of the Exim process (in exim.c). */
0756eb3c 1862
817d9f57 1863if (tls_out.active >= 0)
0756eb3c 1864 {
061b7ebd 1865 char *greeting_cmd;
895fbaf2
JH
1866 BOOL good_response;
1867
41c7c167
PH
1868 if (helo_data == NULL)
1869 {
1870 helo_data = expand_string(ob->helo_data);
1871 if (helo_data == NULL)
1872 {
1873 uschar *message = string_sprintf("failed to expand helo_data: %s",
1874 expand_string_message);
895fbaf2 1875 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
41c7c167
PH
1876 yield = DEFER;
1877 goto SEND_QUIT;
1878 }
1879 }
1880
0d0e4455 1881 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1882 if (smtps)
1883 {
895fbaf2
JH
1884 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1885 '2', ob->command_timeout);
1886#ifdef EXPERIMENTAL_DSN_INFO
1887 smtp_greeting = string_copy(buffer);
1888#endif
1889 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP
1890 }
1891
1892 if (esmtp)
1893 greeting_cmd = "EHLO";
1894 else
1895 {
1896 greeting_cmd = "HELO";
1897 DEBUG(D_transport)
1898 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1899 }
1900
1901 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1902 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c 1903 goto SEND_FAILED;
895fbaf2
JH
1904 good_response = smtp_read_response(&inblock, buffer, sizeof(buffer),
1905 '2', ob->command_timeout);
1906#ifdef EXPERIMENTAL_DSN_INFO
1907 helo_response = string_copy(buffer);
1908#endif
1909 if (!good_response) goto RESPONSE_FAILED;
0756eb3c
PH
1910 }
1911
1912/* If the host is required to use a secure channel, ensure that we
1913have one. */
1914
0e66b3b6
JH
1915else if (
1916# ifdef EXPERIMENTAL_DANE
1917 dane ||
1918# endif
5130845b 1919 verify_check_given_host(&ob->hosts_require_tls, host) == OK
7a31d643 1920 )
0756eb3c
PH
1921 {
1922 save_errno = ERRNO_TLSREQUIRED;
c562fd30 1923 message = string_sprintf("a TLS session is required, but %s",
0756eb3c
PH
1924 tls_offered? "an attempt to start TLS failed" :
1925 "the server did not offer TLS support");
1926 goto TLS_FAILED;
1927 }
0e66b3b6 1928#endif /*SUPPORT_TLS*/
0756eb3c
PH
1929
1930/* If TLS is active, we have just started it up and re-done the EHLO command,
1931so its response needs to be analyzed. If TLS is not active and this is a
1932continued session down a previously-used socket, we haven't just done EHLO, so
1933we skip this. */
1934
1935if (continue_hostname == NULL
a7538db1 1936#ifdef SUPPORT_TLS
817d9f57 1937 || tls_out.active >= 0
a7538db1 1938#endif
0756eb3c
PH
1939 )
1940 {
9094b84b
JH
1941 if (esmtp || lmtp)
1942 peer_offered = ehlo_response(buffer, Ustrlen(buffer),
1943 0 /* no TLS */
1944 | (lmtp && ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
1945 | PEER_OFFERED_PRDR
1946#ifdef SUPPORT_I18N
1947 | (addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
1948 /*XXX if we hand peercaps on to continued-conn processes,
1949 must not depend on this addr */
1950#endif
1951 | PEER_OFFERED_DSN
1952 | PEER_OFFERED_PIPE
1953 | (ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
1954 );
1955
f1513293
PH
1956 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1957 lmtp_ignore_quota option was set. */
1958
9094b84b 1959 igquotstr = peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 1960
0756eb3c
PH
1961 /* If the response to EHLO specified support for the SIZE parameter, note
1962 this, provided size_addition is non-negative. */
1963
9094b84b 1964 smtp_use_size = !!(peer_offered & PEER_OFFERED_SIZE);
0756eb3c
PH
1965
1966 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1967 the current host, esmtp will be false, so PIPELINING can never be used. If
1968 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 1969
9094b84b
JH
1970 smtp_use_pipelining = peer_offered & PEER_OFFERED_PIPE
1971 && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK;
0756eb3c
PH
1972
1973 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
9094b84b 1974 smtp_use_pipelining ? "" : "not ");
0756eb3c 1975
8ccd00b1 1976#ifndef DISABLE_PRDR
9094b84b
JH
1977 if ( peer_offered & PEER_OFFERED_PRDR
1978 && verify_check_given_host(&ob->hosts_try_prdr, host) != OK)
1979 peer_offered &= ~PEER_OFFERED_PRDR;
fd98a5c6 1980
9094b84b 1981 if (peer_offered & PEER_OFFERED_PRDR)
fd98a5c6
JH
1982 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1983#endif
1984
6c1c3d1d 1985 /* Note if the server supports DSN */
9094b84b
JH
1986 smtp_use_dsn = !!(peer_offered & PEER_OFFERED_DSN);
1987 DEBUG(D_transport) debug_printf("%susing DSN\n", smtp_use_dsn ? "" : "not ");
6c1c3d1d 1988
0756eb3c
PH
1989 /* Note if the response to EHLO specifies support for the AUTH extension.
1990 If it has, check that this host is one we want to authenticate to, and do
1991 the business. The host name and address must be available when the
1992 authenticator's client driver is running. */
1993
fcc8e047
JH
1994 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1995 ob, esmtp, &inblock, &outblock))
0756eb3c 1996 {
fcc8e047
JH
1997 default: goto SEND_QUIT;
1998 case OK: break;
1999 case FAIL_SEND: goto SEND_FAILED;
2000 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
2001 }
2002 }
2003
2004/* The setting up of the SMTP call is now complete. Any subsequent errors are
2005message-specific. */
2006
2007setting_up = FALSE;
2008
8c5d388a 2009#ifdef SUPPORT_I18N
9094b84b
JH
2010if (addrlist->prop.utf8_msg)
2011 {
2012 utf8_needed = !addrlist->prop.utf8_downcvt
2013 && !addrlist->prop.utf8_downcvt_maybe;
2014 DEBUG(D_transport) if (!utf8_needed) debug_printf("utf8: %s downconvert\n",
2015 addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
2016 }
2017
7ade712c 2018/* If this is an international message we need the host to speak SMTPUTF8 */
9094b84b 2019if (utf8_needed && !(peer_offered & PEER_OFFERED_UTF8))
7ade712c
JH
2020 {
2021 errno = ERRNO_UTF8_FWD;
2022 goto RESPONSE_FAILED;
2023 }
2024#endif
2025
0756eb3c
PH
2026/* If there is a filter command specified for this transport, we can now
2027set it up. This cannot be done until the identify of the host is known. */
2028
2029if (tblock->filter_command != NULL)
2030 {
2031 BOOL rc;
2032 uschar buffer[64];
2033 sprintf(CS buffer, "%.50s transport", tblock->name);
2034 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
2035 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 2036 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
2037
2038 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2039 yield ERROR. */
2040
2041 if (!rc)
2042 {
895fbaf2
JH
2043 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2044 FALSE);
0756eb3c
PH
2045 yield = ERROR;
2046 goto SEND_QUIT;
2047 }
2048 }
2049
2050
2051/* For messages that have more than the maximum number of envelope recipients,
2052we want to send several transactions down the same SMTP connection. (See
2053comments in deliver.c as to how this reconciles, heuristically, with
2054remote_max_parallel.) This optimization was added to Exim after the following
2055code was already working. The simplest way to put it in without disturbing the
2056code was to use a goto to jump back to this point when there is another
2057transaction to handle. */
2058
2059SEND_MESSAGE:
2060sync_addr = first_addr;
2061address_count = 0;
2062ok = FALSE;
2063send_rset = TRUE;
2064completed_address = FALSE;
2065
2066
2067/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
2068qualification, send it, adding something to the message size to allow for
2069imprecision and things that get added en route. Exim keeps the number of lines
2070in a message, so we can give an accurate value for the original message, but we
2071need some additional to handle added headers. (Double "." characters don't get
2072included in the count.) */
2073
2074p = buffer;
2075*p = 0;
2076
2077if (smtp_use_size)
2078 {
2079 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
2080 while (*p) p++;
2081 }
2082
8ccd00b1 2083#ifndef DISABLE_PRDR
fd98a5c6 2084prdr_active = FALSE;
9094b84b 2085if (peer_offered & PEER_OFFERED_PRDR)
fd98a5c6
JH
2086 for (addr = first_addr; addr; addr = addr->next)
2087 if (addr->transport_return == PENDING_DEFER)
2088 {
2089 for (addr = addr->next; addr; addr = addr->next)
2090 if (addr->transport_return == PENDING_DEFER)
2091 { /* at least two recipients to send */
2092 prdr_active = TRUE;
2093 sprintf(CS p, " PRDR"); p += 5;
a7538db1 2094 break;
fd98a5c6
JH
2095 }
2096 break;
2097 }
fd98a5c6
JH
2098#endif
2099
8c5d388a 2100#ifdef SUPPORT_I18N
9094b84b
JH
2101if ( addrlist->prop.utf8_msg
2102 && !addrlist->prop.utf8_downcvt
2103 && peer_offered & PEER_OFFERED_UTF8
2104 )
7ade712c
JH
2105 sprintf(CS p, " SMTPUTF8"), p += 9;
2106#endif
2107
6c1c3d1d
WB
2108/* check if all addresses have lasthop flag */
2109/* do not send RET and ENVID if true */
7ade712c 2110for (dsn_all_lasthop = TRUE, addr = first_addr;
6c1c3d1d
WB
2111 address_count < max_rcpt && addr != NULL;
2112 addr = addr->next)
2113 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
7ade712c 2114 {
6c1c3d1d 2115 dsn_all_lasthop = FALSE;
7ade712c
JH
2116 break;
2117 }
6c1c3d1d
WB
2118
2119/* Add any DSN flags to the mail command */
2120
7ade712c 2121if (smtp_use_dsn && !dsn_all_lasthop)
6c1c3d1d
WB
2122 {
2123 if (dsn_ret == dsn_ret_hdrs)
2124 {
45500060 2125 Ustrcpy(p, " RET=HDRS");
6c1c3d1d
WB
2126 while (*p) p++;
2127 }
2128 else if (dsn_ret == dsn_ret_full)
2129 {
45500060 2130 Ustrcpy(p, " RET=FULL");
6c1c3d1d
WB
2131 while (*p) p++;
2132 }
2133 if (dsn_envid != NULL)
2134 {
2135 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
2136 while (*p) p++;
2137 }
2138 }
6c1c3d1d 2139
6b62e899
JH
2140/* If an authenticated_sender override has been specified for this transport
2141instance, expand it. If the expansion is forced to fail, and there was already
2142an authenticated_sender for this message, the original value will be used.
2143Other expansion failures are serious. An empty result is ignored, but there is
2144otherwise no check - this feature is expected to be used with LMTP and other
2145cases where non-standard addresses (e.g. without domains) might be required. */
2146
fcc8e047 2147if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
a7538db1
JH
2148 {
2149 yield = ERROR;
2150 goto SEND_QUIT;
2151 }
0756eb3c
PH
2152
2153/* From here until we send the DATA command, we can make use of PIPELINING
2154if the server host supports it. The code has to be able to check the responses
2155at any point, for when the buffer fills up, so we write it totally generally.
2156When PIPELINING is off, each command written reports that it has flushed the
2157buffer. */
2158
2159pending_MAIL = TRUE; /* The block starts with MAIL */
2160
3c8b3577
JH
2161 {
2162 uschar * s = return_path;
8c5d388a 2163#ifdef SUPPORT_I18N
3c8b3577
JH
2164 uschar * errstr = NULL;
2165
2166 /* If we must downconvert, do the from-address here. Remember we had to
2167 for the to-addresses (done below), and also (ugly) for re-doing when building
2168 the delivery log line. */
2169
9094b84b
JH
2170 if ( addrlist->prop.utf8_msg
2171 && (addrlist->prop.utf8_downcvt || !(peer_offered & PEER_OFFERED_UTF8))
2172 )
3c8b3577
JH
2173 {
2174 if (s = string_address_utf8_to_alabel(return_path, &errstr), errstr)
2175 {
895fbaf2 2176 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
3c8b3577
JH
2177 yield = ERROR;
2178 goto SEND_QUIT;
2179 }
2180 setflag(addrlist, af_utf8_downcvt);
2181 }
2182#endif
2183
2184 rc = smtp_write_command(&outblock, smtp_use_pipelining,
2185 "MAIL FROM:<%s>%s\r\n", s, buffer);
2186 }
2187
0756eb3c
PH
2188mail_command = string_copy(big_buffer); /* Save for later error message */
2189
2190switch(rc)
2191 {
2192 case -1: /* Transmission error */
7ade712c 2193 goto SEND_FAILED;
0756eb3c
PH
2194
2195 case +1: /* Block was sent */
7ade712c 2196 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc 2197 ob->command_timeout))
e97957bc 2198 {
7ade712c
JH
2199 if (errno == 0 && buffer[0] == '4')
2200 {
2201 errno = ERRNO_MAIL4XX;
2202 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2203 }
2204 goto RESPONSE_FAILED;
e97957bc 2205 }
7ade712c
JH
2206 pending_MAIL = FALSE;
2207 break;
0756eb3c
PH
2208 }
2209
2210/* Pass over all the relevant recipient addresses for this host, which are the
2211ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2212several before we have to read the responses for those seen so far. This
2213checking is done by a subroutine because it also needs to be done at the end.
2214Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
2215the next one if not all are sent.
2216
2217In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2218last address because we want to abort if any recipients have any kind of
2219problem, temporary or permanent. We know that all recipient addresses will have
2220the PENDING_DEFER status, because only one attempt is ever made, and we know
2221that max_rcpt will be large, so all addresses will be done at once. */
2222
2223for (addr = first_addr;
2224 address_count < max_rcpt && addr != NULL;
2225 addr = addr->next)
2226 {
2227 int count;
2228 BOOL no_flush;
3c8b3577 2229 uschar * rcpt_addr;
0756eb3c 2230
a7538db1 2231 addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no;
6c1c3d1d 2232
0756eb3c
PH
2233 if (addr->transport_return != PENDING_DEFER) continue;
2234
2235 address_count++;
2236 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
2237
6c1c3d1d
WB
2238 /* Add any DSN flags to the rcpt command and add to the sent string */
2239
2240 p = buffer;
2241 *p = 0;
2242
a7538db1 2243 if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1)
6c1c3d1d
WB
2244 {
2245 if ((addr->dsn_flags & rf_dsnflags) != 0)
2246 {
2247 int i;
2248 BOOL first = TRUE;
45500060 2249 Ustrcpy(p, " NOTIFY=");
6c1c3d1d
WB
2250 while (*p) p++;
2251 for (i = 0; i < 4; i++)
6c1c3d1d
WB
2252 if ((addr->dsn_flags & rf_list[i]) != 0)
2253 {
2254 if (!first) *p++ = ',';
2255 first = FALSE;
45500060 2256 Ustrcpy(p, rf_names[i]);
6c1c3d1d
WB
2257 while (*p) p++;
2258 }
6c1c3d1d
WB
2259 }
2260
a7538db1
JH
2261 if (addr->dsn_orcpt != NULL)
2262 {
6c1c3d1d
WB
2263 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
2264 addr->dsn_orcpt);
2265 while (*p) p++;
2266 }
2267 }
6c1c3d1d 2268
0756eb3c
PH
2269 /* Now send the RCPT command, and process outstanding responses when
2270 necessary. After a timeout on RCPT, we just end the function, leaving the
2271 yield as OK, because this error can often mean that there is a problem with
2272 just one address, so we don't want to delay the host. */
2273
3c8b3577
JH
2274 rcpt_addr = transport_rcpt_address(addr, tblock->rcpt_include_affixes);
2275
8c5d388a 2276#ifdef SUPPORT_I18N
3c8b3577
JH
2277 {
2278 uschar * dummy_errstr;
2279 if ( testflag(addrlist, af_utf8_downcvt)
2280 && (rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, &dummy_errstr),
2281 dummy_errstr
2282 ) )
2283 {
2284 errno = ERRNO_EXPANDFAIL;
2285 goto SEND_FAILED;
2286 }
2287 }
2288#endif
2289
6c1c3d1d 2290 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
3c8b3577 2291 rcpt_addr, igquotstr, buffer);
6c1c3d1d 2292
0756eb3c
PH
2293 if (count < 0) goto SEND_FAILED;
2294 if (count > 0)
2295 {
2296 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
2297 &sync_addr, host, count, ob->address_retry_include_sender,
2298 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
2299 sizeof(buffer)))
0756eb3c
PH
2300 {
2301 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2302 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2303 break;
2304
2305 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2306 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2307 case 0: /* No 2xx or 5xx, but no probs */
2308 break;
2309
2310 case -1: goto END_OFF; /* Timeout on RCPT */
2311 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
2312 }
2313 pending_MAIL = FALSE; /* Dealt with MAIL */
2314 }
2315 } /* Loop for next address */
2316
2317/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2318permanently or temporarily. We should have flushed and synced after the last
2319RCPT. */
2320
2321if (mua_wrapper)
2322 {
2323 address_item *badaddr;
168dec3b
JH
2324 for (badaddr = first_addr; badaddr; badaddr = badaddr->next)
2325 if (badaddr->transport_return != PENDING_OK)
2326 {
2327 /*XXX could we find a better errno than 0 here? */
895fbaf2
JH
2328 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2329 testflag(badaddr, af_pass_message));
168dec3b
JH
2330 ok = FALSE;
2331 break;
2332 }
0756eb3c
PH
2333 }
2334
2335/* If ok is TRUE, we know we have got at least one good recipient, and must now
2336send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2337have a good recipient buffered up if we are pipelining. We don't want to waste
2338time sending DATA needlessly, so we only send it if either ok is TRUE or if we
2339are pipelining. The responses are all handled by sync_responses(). */
2340
2341if (ok || (smtp_use_pipelining && !mua_wrapper))
2342 {
2343 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
2344 if (count < 0) goto SEND_FAILED;
2345 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
2346 host, count, ob->address_retry_include_sender, pending_MAIL,
2347 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
2348 {
2349 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
2350 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
2351 break;
2352
2353 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2354 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
2355 case 0: break; /* No 2xx or 5xx, but no probs */
2356
2357 case -1: goto END_OFF; /* Timeout on RCPT */
2358 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2359 }
2360 }
2361
2362/* Save the first address of the next batch. */
2363
2364first_addr = addr;
2365
2366/* If there were no good recipients (but otherwise there have been no
2367problems), just set ok TRUE, since we have handled address-specific errors
2368already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2369for handling the SMTP dot-handling protocol, flagging to apply to headers as
2370well as body. Set the appropriate timeout value to be used for each chunk.
2371(Haven't been able to make it work using select() for writing yet.) */
2372
2373if (!ok) ok = TRUE; else
2374 {
2375 sigalrm_seen = FALSE;
2376 transport_write_timeout = ob->data_timeout;
2377 smtp_command = US"sending data block"; /* For error messages */
2378 DEBUG(D_transport|D_v)
2379 debug_printf(" SMTP>> writing message and terminating \".\"\n");
2380 transport_count = 0;
a7538db1 2381
80a47a2c 2382#ifndef DISABLE_DKIM
4cd12fe9
TK
2383 ok = dkim_transport_write_message(addrlist, inblock.sock,
2384 topt_use_crlf | topt_end_dot | topt_escape_headers |
2385 (tblock->body_only? topt_no_headers : 0) |
2386 (tblock->headers_only? topt_no_body : 0) |
2387 (tblock->return_path_add? topt_add_return_path : 0) |
2388 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2389 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2390 0, /* No size limit */
2391 tblock->add_headers, tblock->remove_headers,
2392 US".", US"..", /* Escaping strings */
2393 tblock->rewrite_rules, tblock->rewrite_existflags,
2394 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 2395 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK
2396 );
2397#else
0756eb3c
PH
2398 ok = transport_write_message(addrlist, inblock.sock,
2399 topt_use_crlf | topt_end_dot | topt_escape_headers |
2400 (tblock->body_only? topt_no_headers : 0) |
2401 (tblock->headers_only? topt_no_body : 0) |
2402 (tblock->return_path_add? topt_add_return_path : 0) |
2403 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
2404 (tblock->envelope_to_add? topt_add_envelope_to : 0),
2405 0, /* No size limit */
2406 tblock->add_headers, tblock->remove_headers,
2407 US".", US"..", /* Escaping strings */
2408 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2409#endif
0756eb3c
PH
2410
2411 /* transport_write_message() uses write() because it is called from other
2412 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2413 it can exit with "Broken pipe" as its error. This really means that the
2414 socket got closed at the far end. */
2415
2416 transport_write_timeout = 0; /* for subsequent transports */
2417
2418 /* Failure can either be some kind of I/O disaster (including timeout),
2419 or the failure of a transport filter or the expansion of added headers. */
2420
2421 if (!ok)
2422 {
2423 buffer[0] = 0; /* There hasn't been a response */
2424 goto RESPONSE_FAILED;
2425 }
2426
2427 /* We used to send the terminating "." explicitly here, but because of
2428 buffering effects at both ends of TCP/IP connections, you don't gain
2429 anything by keeping it separate, so it might as well go in the final
2430 data buffer for efficiency. This is now done by setting the topt_end_dot
2431 flag above. */
2432
2433 smtp_command = US"end of data";
2434
8ccd00b1 2435#ifndef DISABLE_PRDR
fd98a5c6
JH
2436 /* For PRDR we optionally get a partial-responses warning
2437 * followed by the individual responses, before going on with
2438 * the overall response. If we don't get the warning then deal
2439 * with per non-PRDR. */
2440 if(prdr_active)
2441 {
2442 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2443 ob->final_timeout);
2444 if (!ok && errno == 0)
2445 switch(buffer[0])
2446 {
2447 case '2': prdr_active = FALSE;
2448 ok = TRUE;
2449 break;
2450 case '4': errno = ERRNO_DATA4XX;
2451 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2452 break;
2453 }
2454 }
2455 else
2456#endif
2457
2458 /* For non-PRDR SMTP, we now read a single response that applies to the
2459 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2460
e97957bc
PH
2461 if (!lmtp)
2462 {
2463 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2464 ob->final_timeout);
2465 if (!ok && errno == 0 && buffer[0] == '4')
2466 {
2467 errno = ERRNO_DATA4XX;
2468 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2469 }
2470 }
0756eb3c
PH
2471
2472 /* For LMTP, we get back a response for every RCPT command that we sent;
2473 some may be accepted and some rejected. For those that get a response, their
2474 status is fixed; any that are accepted have been handed over, even if later
2475 responses crash - at least, that's how I read RFC 2033.
2476
2477 If all went well, mark the recipient addresses as completed, record which
2478 host/IPaddress they were delivered to, and cut out RSET when sending another
2479 message down the same channel. Write the completed addresses to the journal
2480 now so that they are recorded in case there is a crash of hardware or
2481 software before the spool gets updated. Also record the final SMTP
2482 confirmation if needed (for SMTP only). */
2483
2484 if (ok)
2485 {
2486 int flag = '=';
2487 int delivery_time = (int)(time(NULL) - start_delivery_time);
2488 int len;
0756eb3c
PH
2489 uschar *conf = NULL;
2490 send_rset = FALSE;
2491
0756eb3c
PH
2492 /* Set up confirmation if needed - applies only to SMTP */
2493
d68218c7 2494 if (
0cbf2b82 2495#ifdef DISABLE_EVENT
6c6d6e48 2496 LOGGING(smtp_confirmation) &&
a7538db1 2497#endif
d68218c7
JH
2498 !lmtp
2499 )
0756eb3c 2500 {
55414b25
JH
2501 const uschar *s = string_printing(buffer);
2502 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2503 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
2504 }
2505
fd98a5c6 2506 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2507 each one. */
2508
2509 for (addr = addrlist; addr != first_addr; addr = addr->next)
2510 {
2511 if (addr->transport_return != PENDING_OK) continue;
2512
2513 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2514 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2515 address. For temporary errors, add a retry item for the address so that
2516 it doesn't get tried again too soon. */
0756eb3c 2517
8ccd00b1 2518#ifndef DISABLE_PRDR
fd98a5c6
JH
2519 if (lmtp || prdr_active)
2520#else
0756eb3c 2521 if (lmtp)
fd98a5c6 2522#endif
0756eb3c
PH
2523 {
2524 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2525 ob->final_timeout))
2526 {
2527 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2528 addr->message = string_sprintf(
8ccd00b1 2529#ifndef DISABLE_PRDR
fd98a5c6
JH
2530 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2531#else
2532 "LMTP error after %s: %s",
2533#endif
0756eb3c 2534 big_buffer, string_printing(buffer));
75def545
PH
2535 setflag(addr, af_pass_message); /* Allow message to go to user */
2536 if (buffer[0] == '5')
2537 addr->transport_return = FAIL;
2538 else
2539 {
e97957bc
PH
2540 errno = ERRNO_DATA4XX;
2541 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2542 addr->transport_return = DEFER;
8ccd00b1 2543#ifndef DISABLE_PRDR
fd98a5c6
JH
2544 if (!prdr_active)
2545#endif
2546 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2547 }
0756eb3c
PH
2548 continue;
2549 }
2550 completed_address = TRUE; /* NOW we can set this flag */
6c6d6e48 2551 if (LOGGING(smtp_confirmation))
c0ea85ab 2552 {
55414b25
JH
2553 const uschar *s = string_printing(buffer);
2554 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
2555 conf = (s == buffer)? (uschar *)string_copy(s) : US s;
c0ea85ab 2556 }
0756eb3c
PH
2557 }
2558
2559 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2560 actual host that was used. */
0756eb3c
PH
2561
2562 addr->transport_return = OK;
2563 addr->more_errno = delivery_time;
d427a7f9 2564 addr->host_used = host;
0756eb3c
PH
2565 addr->special_action = flag;
2566 addr->message = conf;
8ccd00b1 2567#ifndef DISABLE_PRDR
fd98a5c6
JH
2568 if (prdr_active) addr->flags |= af_prdr_used;
2569#endif
0756eb3c
PH
2570 flag = '-';
2571
8ccd00b1 2572#ifndef DISABLE_PRDR
fd98a5c6
JH
2573 if (!prdr_active)
2574#endif
2575 {
2576 /* Update the journal. For homonymic addresses, use the base address plus
2577 the transport name. See lots of comments in deliver.c about the reasons
2578 for the complications when homonyms are involved. Just carry on after
2579 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2580
fd98a5c6
JH
2581 if (testflag(addr, af_homonym))
2582 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2583 else
2584 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2585
895fbaf2 2586 DEBUG(D_deliver) debug_printf("journalling %s\n", buffer);
fd98a5c6
JH
2587 len = Ustrlen(CS buffer);
2588 if (write(journal_fd, buffer, len) != len)
2589 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2590 "%s: %s", buffer, strerror(errno));
2591 }
0756eb3c
PH
2592 }
2593
8ccd00b1 2594#ifndef DISABLE_PRDR
fd98a5c6
JH
2595 if (prdr_active)
2596 {
2597 /* PRDR - get the final, overall response. For any non-success
2598 upgrade all the address statuses. */
2599 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2600 ob->final_timeout);
2601 if (!ok)
2602 {
2603 if(errno == 0 && buffer[0] == '4')
2604 {
2605 errno = ERRNO_DATA4XX;
2606 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2607 }
2608 for (addr = addrlist; addr != first_addr; addr = addr->next)
2609 if (buffer[0] == '5' || addr->transport_return == OK)
2610 addr->transport_return = PENDING_OK; /* allow set_errno action */
2611 goto RESPONSE_FAILED;
2612 }
2613
2614 /* Update the journal, or setup retry. */
2615 for (addr = addrlist; addr != first_addr; addr = addr->next)
2616 if (addr->transport_return == OK)
2617 {
2618 if (testflag(addr, af_homonym))
2619 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2620 else
2621 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2622
895fbaf2 2623 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", buffer);
fd98a5c6
JH
2624 len = Ustrlen(CS buffer);
2625 if (write(journal_fd, buffer, len) != len)
2626 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2627 "%s: %s", buffer, strerror(errno));
2628 }
2629 else if (addr->transport_return == DEFER)
2630 retry_add_item(addr, addr->address_retry_key, -2);
2631 }
2632#endif
2633
0756eb3c
PH
2634 /* Ensure the journal file is pushed out to disk. */
2635
54fc8428 2636 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2637 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2638 strerror(errno));
2639 }
2640 }
2641
2642
2643/* Handle general (not specific to one address) failures here. The value of ok
2644is used to skip over this code on the falling through case. A timeout causes a
2645deferral. Other errors may defer or fail according to the response code, and
2646may set up a special errno value, e.g. after connection chopped, which is
2647assumed if errno == 0 and there is no text in the buffer. If control reaches
2648here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2649the problem is not related to this specific message. */
2650
2651if (!ok)
2652 {
895fbaf2
JH
2653 int code, set_rc;
2654 uschar * set_message;
0756eb3c
PH
2655
2656 RESPONSE_FAILED:
895fbaf2
JH
2657 {
2658 save_errno = errno;
2659 message = NULL;
2660 send_quit = check_response(host, &save_errno, addrlist->more_errno,
2661 buffer, &code, &message, &pass_message);
2662 goto FAILED;
2663 }
0756eb3c
PH
2664
2665 SEND_FAILED:
895fbaf2
JH
2666 {
2667 save_errno = errno;
2668 code = '4';
2669 message = US string_sprintf("send() to %s [%s] failed: %s",
2670 host->name, host->address, strerror(save_errno));
2671 send_quit = FALSE;
2672 goto FAILED;
2673 }
0756eb3c
PH
2674
2675 /* This label is jumped to directly when a TLS negotiation has failed,
2676 or was not done for a host for which it is required. Values will be set
2677 in message and save_errno, and setting_up will always be true. Treat as
2678 a temporary error. */
2679
a7538db1 2680#ifdef SUPPORT_TLS
0756eb3c
PH
2681 TLS_FAILED:
2682 code = '4';
a7538db1 2683#endif
0756eb3c
PH
2684
2685 /* If the failure happened while setting up the call, see if the failure was
2686 a 5xx response (this will either be on connection, or following HELO - a 5xx
2687 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2688 never going to accept them. For other errors during setting up (timeouts or
2689 whatever), defer all addresses, and yield DEFER, so that the host is not
2690 tried again for a while. */
2691
2692 FAILED:
2693 ok = FALSE; /* For when reached by GOTO */
895fbaf2 2694 set_message = message;
0756eb3c
PH
2695
2696 if (setting_up)
2697 {
2698 if (code == '5')
895fbaf2 2699 set_rc = FAIL;
0756eb3c 2700 else
895fbaf2 2701 yield = set_rc = DEFER;
0756eb3c
PH
2702 }
2703
e97957bc 2704 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2705 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2706 the contents of the message rather than a real error on the connection. These
2707 cases are treated in the same way as a 4xx response. This next bit of code
2708 does the classification. */
0756eb3c 2709
e97957bc 2710 else
0756eb3c 2711 {
e97957bc 2712 BOOL message_error;
0756eb3c 2713
e97957bc
PH
2714 switch(save_errno)
2715 {
8c5d388a 2716#ifdef SUPPORT_I18N
250b6871
JH
2717 case ERRNO_UTF8_FWD:
2718 code = '5';
2719 /*FALLTHROUGH*/
2720#endif
e97957bc
PH
2721 case 0:
2722 case ERRNO_MAIL4XX:
2723 case ERRNO_DATA4XX:
250b6871
JH
2724 message_error = TRUE;
2725 break;
0756eb3c 2726
e97957bc 2727 case ETIMEDOUT:
250b6871
JH
2728 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2729 Ustrncmp(smtp_command,"end ",4) == 0;
2730 break;
e97957bc
PH
2731
2732 case ERRNO_SMTPCLOSED:
250b6871
JH
2733 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2734 break;
e97957bc
PH
2735
2736 default:
250b6871
JH
2737 message_error = FALSE;
2738 break;
e97957bc 2739 }
0756eb3c 2740
e97957bc 2741 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2742
e97957bc
PH
2743 (a) negative response or timeout after MAIL
2744 (b) negative response after DATA
2745 (c) negative response or timeout or dropped connection after "."
250b6871 2746 (d) utf8 support required and not offered
0756eb3c 2747
e97957bc
PH
2748 It won't be a negative response or timeout after RCPT, as that is dealt
2749 with separately above. The action in all cases is to set an appropriate
2750 error code for all the addresses, but to leave yield set to OK because the
2751 host itself has not failed. Of course, it might in practice have failed
2752 when we've had a timeout, but if so, we'll discover that at the next
2753 delivery attempt. For a temporary error, set the message_defer flag, and
2754 write to the logs for information if this is not the last host. The error
2755 for the last host will be logged as part of the address's log line. */
2756
2757 if (message_error)
0756eb3c 2758 {
e97957bc 2759 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
e97957bc
PH
2760
2761 /* If there's an errno, the message contains just the identity of
2762 the host. */
2763
895fbaf2
JH
2764 if (code == '5')
2765 set_rc = FAIL;
2766 else /* Anything other than 5 is treated as temporary */
e97957bc 2767 {
895fbaf2 2768 set_rc = DEFER;
e97957bc
PH
2769 if (save_errno > 0)
2770 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2771 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
c562fd30 2772 msglog_line(host, message);
e97957bc
PH
2773 *message_defer = TRUE;
2774 }
2775 }
2776
2777 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2778 ".", or some other transportation error. We defer all addresses and yield
2779 DEFER, except for the case of failed add_headers expansion, or a transport
2780 filter failure, when the yield should be ERROR, to stop it trying other
2781 hosts. */
2782
2783 else
2784 {
895fbaf2 2785 set_rc = DEFER;
e97957bc
PH
2786 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2787 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
0756eb3c
PH
2788 }
2789 }
895fbaf2
JH
2790
2791 set_errno(addrlist, save_errno, set_message, set_rc, pass_message, host
2792#ifdef EXPERIMENTAL_DSN_INFO
2793 , smtp_greeting, helo_response
2794#endif
2795 );
0756eb3c
PH
2796 }
2797
2798
2799/* If all has gone well, send_quit will be set TRUE, implying we can end the
2800SMTP session tidily. However, if there were too many addresses to send in one
2801message (indicated by first_addr being non-NULL) we want to carry on with the
2802rest of them. Also, it is desirable to send more than one message down the SMTP
2803connection if there are several waiting, provided we haven't already sent so
2804many as to hit the configured limit. The function transport_check_waiting looks
2805for a waiting message and returns its id. Then transport_pass_socket tries to
2806set up a continued delivery by passing the socket on to another process. The
2807variable send_rset is FALSE if a message has just been successfully transfered.
2808
2809If we are already sending down a continued channel, there may be further
2810addresses not yet delivered that are aimed at the same host, but which have not
2811been passed in this run of the transport. In this case, continue_more will be
2812true, and all we should do is send RSET if necessary, and return, leaving the
2813channel open.
2814
2815However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2816do not want to continue with other messages down the same channel, because that
2817can lead to looping between two or more messages, all with the same,
2818temporarily failing address(es). [The retry information isn't updated yet, so
2819new processes keep on trying.] We probably also don't want to try more of this
2820message's addresses either.
2821
2822If we have started a TLS session, we have to end it before passing the
2823connection to a new process. However, not all servers can handle this (Exim
2824can), so we do not pass such a connection on if the host matches
2825hosts_nopass_tls. */
2826
2827DEBUG(D_transport)
2828 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2829 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2830 continue_more, yield, (first_addr == NULL)? "":"not ");
2831
2832if (completed_address && ok && send_quit)
2833 {
2834 BOOL more;
a39bd74d
JB
2835 smtp_compare_t t_compare;
2836
2837 t_compare.tblock = tblock;
2838 t_compare.current_sender_address = sender_address;
2839
5130845b
JH
2840 if ( first_addr != NULL
2841 || continue_more
2842 || ( ( tls_out.active < 0
2843 || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK
2844 )
0756eb3c
PH
2845 &&
2846 transport_check_waiting(tblock->name, host->name,
a39bd74d
JB
2847 tblock->connection_max_messages, new_message_id, &more,
2848 (oicf)smtp_are_same_identities, (void*)&t_compare)
5130845b 2849 ) )
0756eb3c
PH
2850 {
2851 uschar *msg;
447d236c 2852 BOOL pass_message;
0756eb3c
PH
2853
2854 if (send_rset)
2855 {
2856 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2857 {
2858 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2859 host->address, strerror(save_errno));
2860 send_quit = FALSE;
2861 }
2862 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2863 ob->command_timeout)))
2864 {
2865 int code;
447d236c
PH
2866 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2867 &pass_message);
0756eb3c
PH
2868 if (!send_quit)
2869 {
c562fd30
JH
2870 DEBUG(D_transport) debug_printf("H=%s [%s] %s\n",
2871 host->name, host->address, msg);
0756eb3c
PH
2872 }
2873 }
2874 }
2875
2876 /* Either RSET was not needed, or it succeeded */
2877
2878 if (ok)
2879 {
2880 if (first_addr != NULL) /* More addresses still to be sent */
2881 { /* in this run of the transport */
2882 continue_sequence++; /* Causes * in logging */
2883 goto SEND_MESSAGE;
2884 }
2885 if (continue_more) return yield; /* More addresses for another run */
2886
2887 /* Pass the socket to a new Exim process. Before doing so, we must shut
2888 down TLS. Not all MTAs allow for the continuation of the SMTP session
2889 when TLS is shut down. We test for this by sending a new EHLO. If we
2890 don't get a good response, we don't attempt to pass the socket on. */
2891
a7538db1 2892#ifdef SUPPORT_TLS
817d9f57 2893 if (tls_out.active >= 0)
0756eb3c 2894 {
817d9f57 2895 tls_close(FALSE, TRUE);
061b7ebd
PP
2896 if (smtps)
2897 ok = FALSE;
2898 else
2899 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2900 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2901 ob->command_timeout);
0756eb3c 2902 }
a7538db1 2903#endif
0756eb3c
PH
2904
2905 /* If the socket is successfully passed, we musn't send QUIT (or
2906 indeed anything!) from here. */
2907
895fbaf2
JH
2908/*XXX DSN_INFO: assume likely to do new HELO; but for greet we'll want to
2909propagate it from the initial
2910*/
0756eb3c
PH
2911 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2912 new_message_id, inblock.sock))
2913 {
2914 send_quit = FALSE;
2915 }
2916 }
2917
2918 /* If RSET failed and there are addresses left, they get deferred. */
2919
895fbaf2
JH
2920 else set_errno(first_addr, errno, msg, DEFER, FALSE, host
2921#ifdef EXPERIMENTAL_DSN_INFO
2922 , smtp_greeting, helo_response
2923#endif
2924 );
0756eb3c
PH
2925 }
2926 }
2927
2928/* End off tidily with QUIT unless the connection has died or the socket has
2929been passed to another process. There has been discussion on the net about what
2930to do after sending QUIT. The wording of the RFC suggests that it is necessary
2931to wait for a response, but on the other hand, there isn't anything one can do
2932with an error response, other than log it. Exim used to do that. However,
2933further discussion suggested that it is positively advantageous not to wait for
2934the response, but to close the session immediately. This is supposed to move
2935the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2936load from the server. (Hosts that are both servers and clients may not see much
2937difference, of course.) Further discussion indicated that this was safe to do
2938on Unix systems which have decent implementations of TCP/IP that leave the
2939connection around for a while (TIME_WAIT) after the application has gone away.
2940This enables the response sent by the server to be properly ACKed rather than
2941timed out, as can happen on broken TCP/IP implementations on other OS.
2942
2943This change is being made on 31-Jul-98. After over a year of trouble-free
2944operation, the old commented-out code was removed on 17-Sep-99. */
2945
2946SEND_QUIT:
2947if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2948
2949END_OFF:
2950
2951#ifdef SUPPORT_TLS
817d9f57 2952tls_close(FALSE, TRUE);
0756eb3c
PH
2953#endif
2954
2955/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2956works because the NULL setting is passed back to the calling process, and
2957remote_max_parallel is forced to 1 when delivering over an existing connection,
2958
2959If all went well and continue_more is set, we shouldn't actually get here if
2960there are further addresses, as the return above will be taken. However,
2961writing RSET might have failed, or there may be other addresses whose hosts are
2962specified in the transports, and therefore not visible at top level, in which
2963case continue_more won't get set. */
2964
b9d9c5a2 2965HDEBUG(D_transport|D_acl|D_v) debug_printf(" SMTP(close)>>\n");
f1e894f3 2966(void)close(inblock.sock);
a7538db1 2967
0cbf2b82 2968#ifndef DISABLE_EVENT
774ef2d7 2969(void) event_raise(tblock->event_action, US"tcp:close", NULL);
a7538db1
JH
2970#endif
2971
0756eb3c
PH
2972continue_transport = NULL;
2973continue_hostname = NULL;
2974return yield;
2975}
2976
2977
2978
2979
2980/*************************************************
2981* Closedown entry point *
2982*************************************************/
2983
2984/* This function is called when exim is passed an open smtp channel
2985from another incarnation, but the message which it has been asked
2986to deliver no longer exists. The channel is on stdin.
2987
2988We might do fancy things like looking for another message to send down
2989the channel, but if the one we sought has gone, it has probably been
2990delivered by some other process that itself will seek further messages,
2991so just close down our connection.
2992
2993Argument: pointer to the transport instance block
2994Returns: nothing
2995*/
2996
2997void
2998smtp_transport_closedown(transport_instance *tblock)
2999{
3000smtp_transport_options_block *ob =
3001 (smtp_transport_options_block *)(tblock->options_block);
3002smtp_inblock inblock;
3003smtp_outblock outblock;
3004uschar buffer[256];
3005uschar inbuffer[4096];
3006uschar outbuffer[16];
3007
3008inblock.sock = fileno(stdin);
3009inblock.buffer = inbuffer;
3010inblock.buffersize = sizeof(inbuffer);
3011inblock.ptr = inbuffer;
3012inblock.ptrend = inbuffer;
3013
3014outblock.sock = inblock.sock;
3015outblock.buffersize = sizeof(outbuffer);
3016outblock.buffer = outbuffer;
3017outblock.ptr = outbuffer;
3018outblock.cmd_count = 0;
3019outblock.authenticating = FALSE;
3020
3021(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
3022(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
3023 ob->command_timeout);
f1e894f3 3024(void)close(inblock.sock);
0756eb3c
PH
3025}
3026
3027
3028
3029/*************************************************
3030* Prepare addresses for delivery *
3031*************************************************/
3032
3033/* This function is called to flush out error settings from previous delivery
3034attempts to other hosts. It also records whether we got here via an MX record
3035or not in the more_errno field of the address. We are interested only in
3036addresses that are still marked DEFER - others may have got delivered to a
3037previously considered IP address. Set their status to PENDING_DEFER to indicate
3038which ones are relevant this time.
3039
3040Arguments:
3041 addrlist the list of addresses
3042 host the host we are delivering to
3043
3044Returns: the first address for this delivery
3045*/
3046
3047static address_item *
3048prepare_addresses(address_item *addrlist, host_item *host)
3049{
3050address_item *first_addr = NULL;
3051address_item *addr;
3052for (addr = addrlist; addr != NULL; addr = addr->next)
168dec3b
JH
3053 if (addr->transport_return == DEFER)
3054 {
3055 if (first_addr == NULL) first_addr = addr;
3056 addr->transport_return = PENDING_DEFER;
3057 addr->basic_errno = 0;
3058 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
3059 addr->message = NULL;
a7538db1 3060#ifdef SUPPORT_TLS
168dec3b
JH
3061 addr->cipher = NULL;
3062 addr->ourcert = NULL;
3063 addr->peercert = NULL;
3064 addr->peerdn = NULL;
3065 addr->ocsp = OCSP_NOT_REQ;
a7538db1 3066#endif
895fbaf2
JH
3067#ifdef EXPERIMENTAL_DSN_INFO
3068 addr->smtp_greeting = NULL;
3069 addr->helo_response = NULL;
3070#endif
168dec3b 3071 }
0756eb3c
PH
3072return first_addr;
3073}
3074
3075
3076
3077/*************************************************
3078* Main entry point *
3079*************************************************/
3080
3081/* See local README for interface details. As this is a remote transport, it is
3082given a chain of addresses to be delivered in one connection, if possible. It
3083always returns TRUE, indicating that each address has its own independent
3084status set, except if there is a setting up problem, in which case it returns
3085FALSE. */
3086
3087BOOL
3088smtp_transport_entry(
3089 transport_instance *tblock, /* data for this instantiation */
3090 address_item *addrlist) /* addresses we are working on */
3091{
3092int cutoff_retry;
3093int port;
3094int hosts_defer = 0;
3095int hosts_fail = 0;
3096int hosts_looked_up = 0;
3097int hosts_retry = 0;
3098int hosts_serial = 0;
3099int hosts_total = 0;
8e669ac1 3100int total_hosts_tried = 0;
0756eb3c
PH
3101address_item *addr;
3102BOOL expired = TRUE;
3103BOOL continuing = continue_hostname != NULL;
3104uschar *expanded_hosts = NULL;
3105uschar *pistring;
3106uschar *tid = string_sprintf("%s transport", tblock->name);
3107smtp_transport_options_block *ob =
3108 (smtp_transport_options_block *)(tblock->options_block);
3109host_item *hostlist = addrlist->host_list;
3110host_item *host = NULL;
3111
3112DEBUG(D_transport)
3113 {
3114 debug_printf("%s transport entered\n", tblock->name);
3115 for (addr = addrlist; addr != NULL; addr = addr->next)
3116 debug_printf(" %s\n", addr->address);
3117 if (continuing) debug_printf("already connected to %s [%s]\n",
3118 continue_hostname, continue_host_address);
3119 }
3120
f6c332bd
PH
3121/* Set the flag requesting that these hosts be added to the waiting
3122database if the delivery fails temporarily or if we are running with
3123queue_smtp or a 2-stage queue run. This gets unset for certain
3124kinds of error, typically those that are specific to the message. */
3125
3126update_waiting = TRUE;
3127
0756eb3c
PH
3128/* If a host list is not defined for the addresses - they must all have the
3129same one in order to be passed to a single transport - or if the transport has
3130a host list with hosts_override set, use the host list supplied with the
3131transport. It is an error for this not to exist. */
3132
3133if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
3134 {
3135 if (ob->hosts == NULL)
3136 {
3137 addrlist->message = string_sprintf("%s transport called with no hosts set",
3138 tblock->name);
3139 addrlist->transport_return = PANIC;
3140 return FALSE; /* Only top address has status */
3141 }
3142
3143 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
3144 ob->hosts);
3145
3146 /* If the transport's host list contains no '$' characters, and we are not
3147 randomizing, it is fixed and therefore a chain of hosts can be built once
3148 and for all, and remembered for subsequent use by other calls to this
3149 transport. If, on the other hand, the host list does contain '$', or we are
3150 randomizing its order, we have to rebuild it each time. In the fixed case,
3151 as the hosts string will never be used again, it doesn't matter that we
3152 replace all the : characters with zeros. */
3153
3154 if (ob->hostlist == NULL)
3155 {
3156 uschar *s = ob->hosts;
3157
3158 if (Ustrchr(s, '$') != NULL)
3159 {
d427a7f9 3160 if (!(expanded_hosts = expand_string(s)))
0756eb3c
PH
3161 {
3162 addrlist->message = string_sprintf("failed to expand list of hosts "
3163 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
3164 addrlist->transport_return = search_find_defer? DEFER : PANIC;
3165 return FALSE; /* Only top address has status */
3166 }
3167 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
3168 "\"%s\"\n", s, expanded_hosts);
3169 s = expanded_hosts;
3170 }
3171 else
3172 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
3173
3174 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
3175
e276e04b
TF
3176 /* Check that the expansion yielded something useful. */
3177 if (hostlist == NULL)
3178 {
3179 addrlist->message =
3180 string_sprintf("%s transport has empty hosts setting", tblock->name);
3181 addrlist->transport_return = PANIC;
3182 return FALSE; /* Only top address has status */
3183 }
3184
0756eb3c
PH
3185 /* If there was no expansion of hosts, save the host list for
3186 next time. */
3187
d427a7f9 3188 if (!expanded_hosts) ob->hostlist = hostlist;
0756eb3c
PH
3189 }
3190
3191 /* This is not the first time this transport has been run in this delivery;
3192 the host list was built previously. */
3193
55414b25
JH
3194 else
3195 hostlist = ob->hostlist;
0756eb3c
PH
3196 }
3197
3198/* The host list was supplied with the address. If hosts_randomize is set, we
3199must sort it into a random order if it did not come from MX records and has not
3200already been randomized (but don't bother if continuing down an existing
3201connection). */
3202
3203else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
3204 {
3205 host_item *newlist = NULL;
3206 while (hostlist != NULL)
3207 {
3208 host_item *h = hostlist;
3209 hostlist = hostlist->next;
3210
3211 h->sort_key = random_number(100);
3212
3213 if (newlist == NULL)
3214 {
3215 h->next = NULL;
3216 newlist = h;
3217 }
3218 else if (h->sort_key < newlist->sort_key)
3219 {
3220 h->next = newlist;
3221 newlist = h;
3222 }
3223 else
3224 {
3225 host_item *hh = newlist;
3226 while (hh->next != NULL)
3227 {
3228 if (h->sort_key < hh->next->sort_key) break;
3229 hh = hh->next;
3230 }
3231 h->next = hh->next;
3232 hh->next = h;
3233 }
3234 }
3235
3236 hostlist = addrlist->host_list = newlist;
3237 }
3238
2d280592 3239/* Sort out the default port. */
0756eb3c
PH
3240
3241if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c 3242
0756eb3c
PH
3243/* For each host-plus-IP-address on the list:
3244
3245. If this is a continued delivery and the host isn't the one with the
3246 current connection, skip.
3247
3248. If the status is unusable (i.e. previously failed or retry checked), skip.
3249
3250. If no IP address set, get the address, either by turning the name into
3251 an address, calling gethostbyname if gethostbyname is on, or by calling
3252 the DNS. The DNS may yield multiple addresses, in which case insert the
3253 extra ones into the list.
3254
3255. Get the retry data if not previously obtained for this address and set the
3256 field which remembers the state of this address. Skip if the retry time is
3257 not reached. If not, remember whether retry data was found. The retry string
3258 contains both the name and the IP address.
3259
3260. Scan the list of addresses and mark those whose status is DEFER as
3261 PENDING_DEFER. These are the only ones that will be processed in this cycle
3262 of the hosts loop.
3263
3264. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
3265 Some addresses may be successfully delivered, others may fail, and yet
3266 others may get temporary errors and so get marked DEFER.
3267
3268. The return from the delivery attempt is OK if a connection was made and a
3269 valid SMTP dialogue was completed. Otherwise it is DEFER.
3270
3271. If OK, add a "remove" retry item for this host/IPaddress, if any.
3272
3273. If fail to connect, or other defer state, add a retry item.
3274
3275. If there are any addresses whose status is still DEFER, carry on to the
3276 next host/IPaddress, unless we have tried the number of hosts given
533244af 3277 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
3278 there is some fancy logic for hosts_max_try that means its limit can be
3279 overstepped in some circumstances.
0756eb3c
PH
3280
3281If we get to the end of the list, all hosts have deferred at least one address,
3282or not reached their retry times. If delay_after_cutoff is unset, it requests a
3283delivery attempt to those hosts whose last try was before the arrival time of
3284the current message. To cope with this, we have to go round the loop a second
3285time. After that, set the status and error data for any addresses that haven't
3286had it set already. */
3287
3288for (cutoff_retry = 0; expired &&
3289 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
3290 cutoff_retry++)
3291 {
3292 host_item *nexthost = NULL;
3293 int unexpired_hosts_tried = 0;
3294
3295 for (host = hostlist;
8e669ac1 3296 host != NULL &&
533244af
PH
3297 unexpired_hosts_tried < ob->hosts_max_try &&
3298 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
3299 host = nexthost)
3300 {
3301 int rc;
3302 int host_af;
3303 uschar *rs;
3304 BOOL serialized = FALSE;
3305 BOOL host_is_expired = FALSE;
3306 BOOL message_defer = FALSE;
0756eb3c
PH
3307 BOOL some_deferred = FALSE;
3308 address_item *first_addr = NULL;
3309 uschar *interface = NULL;
3310 uschar *retry_host_key = NULL;
3311 uschar *retry_message_key = NULL;
3312 uschar *serialize_key = NULL;
3313
9c4e8f60
PH
3314 /* Default next host is next host. :-) But this can vary if the
3315 hosts_max_try limit is hit (see below). It may also be reset if a host
3316 address is looked up here (in case the host was multihomed). */
3317
3318 nexthost = host->next;
3319
0756eb3c
PH
3320 /* If the address hasn't yet been obtained from the host name, look it up
3321 now, unless the host is already marked as unusable. If it is marked as
3322 unusable, it means that the router was unable to find its IP address (in
3323 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
3324 the lookup failed last time. We don't get this far if *all* MX records
3325 point to non-existent hosts; that is treated as a hard error.
3326
3327 We can just skip this host entirely. When the hosts came from the router,
3328 the address will timeout based on the other host(s); when the address is
3329 looked up below, there is an explicit retry record added.
3330
3331 Note that we mustn't skip unusable hosts if the address is not unset; they
3332 may be needed as expired hosts on the 2nd time round the cutoff loop. */
3333
3334 if (host->address == NULL)
3335 {
322050c2 3336 int new_port, flags;
7cd1141b 3337 host_item *hh;
0756eb3c
PH
3338
3339 if (host->status >= hstatus_unusable)
3340 {
3341 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
3342 host->name);
3343 continue;
3344 }
3345
3346 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
3347
7cd1141b
PH
3348 /* The host name is permitted to have an attached port. Find it, and
3349 strip it from the name. Just remember it for now. */
3350
3351 new_port = host_item_get_port(host);
3352
3353 /* Count hosts looked up */
3354
0756eb3c
PH
3355 hosts_looked_up++;
3356
3357 /* Find by name if so configured, or if it's an IP address. We don't
3358 just copy the IP address, because we need the test-for-local to happen. */
3359
322050c2
PH
3360 flags = HOST_FIND_BY_A;
3361 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
3362 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
3363
7e66e54d 3364 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
55414b25 3365 rc = host_find_byname(host, NULL, flags, NULL, TRUE);
0756eb3c 3366 else
0756eb3c 3367 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
7cd171b7 3368 &ob->dnssec, /* domains for request/require */
55414b25 3369 NULL, NULL);
0756eb3c 3370
7cd1141b
PH
3371 /* Update the host (and any additional blocks, resulting from
3372 multihoming) with a host-specific port, if any. */
3373
3374 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
3375
0756eb3c
PH
3376 /* Failure to find the host at this time (usually DNS temporary failure)
3377 is really a kind of routing failure rather than a transport failure.
3378 Therefore we add a retry item of the routing kind, not to stop us trying
3379 to look this name up here again, but to ensure the address gets timed
3380 out if the failures go on long enough. A complete failure at this point
3381 commonly points to a configuration error, but the best action is still
3382 to carry on for the next host. */
3383
3384 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
3385 {
3386 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
3387 expired = FALSE;
3388 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
3389 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
3390 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
3391 host->status = hstatus_unusable;
3392
3393 for (addr = addrlist; addr != NULL; addr = addr->next)
3394 {
3395 if (addr->transport_return != DEFER) continue;
3396 addr->basic_errno = ERRNO_UNKNOWNHOST;
3397 addr->message =
3398 string_sprintf("failed to lookup IP address for %s", host->name);
3399 }
3400 continue;
3401 }
3402
3403 /* If the host is actually the local host, we may have a problem, or
3404 there may be some cunning configuration going on. In the problem case,
3405 log things and give up. The default transport status is already DEFER. */
3406
3407 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
3408 {
3409 for (addr = addrlist; addr != NULL; addr = addr->next)
3410 {
3411 addr->basic_errno = 0;
3412 addr->message = string_sprintf("%s transport found host %s to be "
3413 "local", tblock->name, host->name);
3414 }
3415 goto END_TRANSPORT;
3416 }
3417 } /* End of block for IP address lookup */
3418
3419 /* If this is a continued delivery, we are interested only in the host
3420 which matches the name of the existing open channel. The check is put
3421 here after the local host lookup, in case the name gets expanded as a
3422 result of the lookup. Set expired FALSE, to save the outer loop executing
3423 twice. */
3424
3425 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
3426 Ustrcmp(continue_host_address, host->address) != 0))
3427 {
3428 expired = FALSE;
3429 continue; /* With next host */
3430 }
3431
9c4e8f60
PH
3432 /* Reset the default next host in case a multihomed host whose addresses
3433 are not looked up till just above added to the host list. */
83364d30
PH
3434
3435 nexthost = host->next;
3436
0756eb3c
PH
3437 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3438 domain is in queue_smtp_domains, we don't actually want to attempt any
3439 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3440 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3441 were not in it. We don't want to hold up all SMTP deliveries! Except when
3442 doing a two-stage queue run, don't do this if forcing. */
3443
3444 if ((!deliver_force || queue_2stage) && (queue_smtp ||
55414b25
JH
3445 match_isinlist(addrlist->domain,
3446 (const uschar **)&queue_smtp_domains, 0,
cf39cf57 3447 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
3448 {
3449 expired = FALSE;
3450 for (addr = addrlist; addr != NULL; addr = addr->next)
3451 {
3452 if (addr->transport_return != DEFER) continue;
3453 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3454 }
3455 continue; /* With next host */
3456 }
3457
3458 /* Count hosts being considered - purely for an intelligent comment
3459 if none are usable. */
3460
3461 hosts_total++;
3462
3463 /* Set $host and $host address now in case they are needed for the