tidying
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
d4e5e70b 5/* Copyright (c) University of Cambridge 1995 - 2017 */
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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
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11
12/* Options specific to the smtp transport. This transport also supports LMTP
13over TCP/IP. The options must be in alphabetic order (note that "_" comes
14before the lower case letters). Some live in the transport_instance block so as
15to be publicly visible; these are flagged with opt_public. */
16
17optionlist smtp_transport_options[] = {
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18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
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20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
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23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
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25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
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29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
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31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 41#ifndef DISABLE_DKIM
f7572e5a 42 { "dkim_canon", opt_stringptr,
ff5aac2b 43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
f7572e5a 44 { "dkim_domain", opt_stringptr,
ff5aac2b 45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
f7572e5a 46 { "dkim_private_key", opt_stringptr,
ff5aac2b 47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
f7572e5a 48 { "dkim_selector", opt_stringptr,
ff5aac2b 49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
f7572e5a 50 { "dkim_sign_headers", opt_stringptr,
ff5aac2b 51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
f7572e5a 52 { "dkim_strict", opt_stringptr,
ff5aac2b 53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
80a47a2c 54#endif
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55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
578897ea 59 { "dnssec_request_domains", opt_stringptr,
7cd171b7 60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 61 { "dnssec_require_domains", opt_stringptr,
7cd171b7 62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
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63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
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65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
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77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 79#ifdef SUPPORT_TLS
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80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 82#endif
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83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 87#ifdef SUPPORT_TLS
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88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
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90 { "hosts_noproxy_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
80a47a2c 92#endif
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93 { "hosts_override", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_override) },
95 { "hosts_randomize", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 97#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
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98 { "hosts_request_ocsp", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
100#endif
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101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 103#ifdef SUPPORT_TLS
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104# ifdef EXPERIMENTAL_DANE
105 { "hosts_require_dane", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
107# endif
f2de3a33 108# ifndef DISABLE_OCSP
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109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
111# endif
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112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 114#endif
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115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
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117 { "hosts_try_chunking", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
7a31d643 119#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
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120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122#endif
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123 { "hosts_try_fastopen", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
8ccd00b1 125#ifndef DISABLE_PRDR
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126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128#endif
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129#ifdef SUPPORT_TLS
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
132#endif
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133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
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137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
506900af 141 { "multi_domain", opt_expand_bool | opt_public,
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142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 147 { "retry_include_ip_address", opt_expand_bool,
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148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
f0989ec0 153#ifdef SUPPORT_SOCKS
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154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156#endif
80a47a2c 157#ifdef SUPPORT_TLS
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158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
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162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
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164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 166 { "tls_require_ciphers", opt_stringptr,
0756eb3c 167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
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168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
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170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
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172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
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174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 176 { "tls_verify_certificates", opt_stringptr,
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177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 180#endif
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181};
182
183/* Size of the options list. An extern variable has to be used so that its
184address can appear in the tables drtables.c. */
185
186int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
188
189/* Default private options block for the smtp transport. */
190
191smtp_transport_options_block smtp_transport_option_defaults = {
192 NULL, /* hosts */
193 NULL, /* fallback_hosts */
194 NULL, /* hostlist */
195 NULL, /* fallback_hostlist */
196 NULL, /* authenticated_sender */
197 US"$primary_hostname", /* helo_data */
198 NULL, /* interface */
199 NULL, /* port */
200 US"smtp", /* protocol */
9e4f5962 201 NULL, /* DSCP */
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202 NULL, /* serialize_hosts */
203 NULL, /* hosts_try_auth */
204 NULL, /* hosts_require_auth */
f98442df 205 US"*", /* hosts_try_chunking */
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206#ifdef EXPERIMENTAL_DANE
207 NULL, /* hosts_try_dane */
7a31d643 208 NULL, /* hosts_require_dane */
96e47838 209#endif
fb05276a 210 NULL, /* hosts_try_fastopen */
8ccd00b1 211#ifndef DISABLE_PRDR
f98442df 212 US"*", /* hosts_try_prdr */
fd98a5c6 213#endif
f2de3a33 214#ifndef DISABLE_OCSP
0e66b3b6 215 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
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216 NULL, /* hosts_require_ocsp */
217#endif
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218 NULL, /* hosts_require_tls */
219 NULL, /* hosts_avoid_tls */
6c9ed72e 220 NULL, /* hosts_verify_avoid_tls */
c51b8e75 221 NULL, /* hosts_avoid_pipelining */
0756eb3c 222 NULL, /* hosts_avoid_esmtp */
57cc2785 223#ifdef SUPPORT_TLS
0756eb3c 224 NULL, /* hosts_nopass_tls */
875512a3 225 US"*", /* hosts_noproxy_tls */
57cc2785 226#endif
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227 5*60, /* command_timeout */
228 5*60, /* connect_timeout; shorter system default overrides */
229 5*60, /* data timeout */
230 10*60, /* final timeout */
231 1024, /* size_addition */
232 5, /* hosts_max_try */
8e669ac1 233 50, /* hosts_max_try_hardlimit */
48c7f9e2 234 TRUE, /* address_retry_include_sender */
0756eb3c 235 FALSE, /* allow_localhost */
382afc6b 236 FALSE, /* authenticated_sender_force */
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237 FALSE, /* gethostbyname */
238 TRUE, /* dns_qualify_single */
239 FALSE, /* dns_search_parents */
0539a19d 240 { NULL, NULL }, /* dnssec_domains {request,require} */
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241 TRUE, /* delay_after_cutoff */
242 FALSE, /* hosts_override */
243 FALSE, /* hosts_randomize */
244 TRUE, /* keepalive */
f1513293 245 FALSE, /* lmtp_ignore_quota */
9c695f6d 246 NULL, /* expand_retry_include_ip_address */
0756eb3c 247 TRUE /* retry_include_ip_address */
f0989ec0 248#ifdef SUPPORT_SOCKS
7eb6c37c 249 ,NULL /* socks_proxy */
b8bf753b 250#endif
80a47a2c 251#ifdef SUPPORT_TLS
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252 ,NULL, /* tls_certificate */
253 NULL, /* tls_crl */
254 NULL, /* tls_privatekey */
255 NULL, /* tls_require_ciphers */
54c90be1 256 NULL, /* tls_sni */
0e0f3f56 257 US"system", /* tls_verify_certificates */
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258 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
259 /* tls_dh_min_bits */
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260 TRUE, /* tls_tempfail_tryclear */
261 NULL, /* tls_verify_hosts */
610ff438 262 US"*", /* tls_try_verify_hosts */
01a4a5c5 263 US"*" /* tls_verify_cert_hostnames */
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264#endif
265#ifndef DISABLE_DKIM
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266 , {NULL, /* dkim_canon */
267 NULL, /* dkim_domain */
268 NULL, /* dkim_private_key */
269 NULL, /* dkim_selector */
270 NULL, /* dkim_sign_headers */
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271 NULL, /* dkim_strict */
272 FALSE} /* dot_stuffed */
80a47a2c 273#endif
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274};
275
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276/* some DSN flags for use later */
277
278static int rf_list[] = {rf_notify_never, rf_notify_success,
279 rf_notify_failure, rf_notify_delay };
280
45500060 281static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
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282
283
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284
285/* Local statics */
286
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287static uschar *smtp_command; /* Points to last cmd for error messages */
288static uschar *mail_command; /* Points to MAIL cmd for error messages */
289static uschar *data_command = US""; /* Points to DATA cmd for error messages */
290static BOOL update_waiting; /* TRUE to update the "wait" database */
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291
292/*XXX move to smtp_context */
87cb4a16 293static BOOL pipelining_active; /* current transaction is in pipe mode */
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294
295
296/*************************************************
297* Setup entry point *
298*************************************************/
299
300/* This function is called when the transport is about to be used,
301but before running it in a sub-process. It is used for two things:
302
303 (1) To set the fallback host list in addresses, when delivering.
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304 (2) To pass back the interface, port, protocol, and other options, for use
305 during callout verification.
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306
307Arguments:
308 tblock pointer to the transport instance block
309 addrlist list of addresses about to be transported
310 tf if not NULL, pointer to block in which to return options
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311 uid the uid that will be set (not used)
312 gid the gid that will be set (not used)
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313 errmsg place for error message (not used)
314
315Returns: OK always (FAIL, DEFER not used)
316*/
317
318static int
319smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 320 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
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321{
322smtp_transport_options_block *ob =
323 (smtp_transport_options_block *)(tblock->options_block);
324
325errmsg = errmsg; /* Keep picky compilers happy */
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326uid = uid;
327gid = gid;
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328
329/* Pass back options if required. This interface is getting very messy. */
330
02b41d71 331if (tf)
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332 {
333 tf->interface = ob->interface;
334 tf->port = ob->port;
335 tf->protocol = ob->protocol;
336 tf->hosts = ob->hosts;
337 tf->hosts_override = ob->hosts_override;
338 tf->hosts_randomize = ob->hosts_randomize;
339 tf->gethostbyname = ob->gethostbyname;
340 tf->qualify_single = ob->dns_qualify_single;
341 tf->search_parents = ob->dns_search_parents;
26da7e20 342 tf->helo_data = ob->helo_data;
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343 }
344
345/* Set the fallback host list for all the addresses that don't have fallback
346host lists, provided that the local host wasn't present in the original host
347list. */
348
349if (!testflag(addrlist, af_local_host_removed))
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350 for (; addrlist; addrlist = addrlist->next)
351 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
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352
353return OK;
354}
355
356
357
358/*************************************************
359* Initialization entry point *
360*************************************************/
361
362/* Called for each instance, after its options have been read, to
363enable consistency checks to be done, or anything else that needs
364to be set up.
365
366Argument: pointer to the transport instance block
367Returns: nothing
368*/
369
370void
371smtp_transport_init(transport_instance *tblock)
372{
373smtp_transport_options_block *ob =
374 (smtp_transport_options_block *)(tblock->options_block);
375
376/* Retry_use_local_part defaults FALSE if unset */
377
378if (tblock->retry_use_local_part == TRUE_UNSET)
379 tblock->retry_use_local_part = FALSE;
380
381/* Set the default port according to the protocol */
382
383if (ob->port == NULL)
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384 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
385 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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386
387/* Set up the setup entry point, to be called before subprocesses for this
388transport. */
389
390tblock->setup = smtp_transport_setup;
391
392/* Complain if any of the timeouts are zero. */
393
394if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
395 ob->final_timeout <= 0)
396 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
397 "command, data, or final timeout value is zero for %s transport",
398 tblock->name);
399
400/* If hosts_override is set and there are local hosts, set the global
401flag that stops verify from showing router hosts. */
402
403if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
404
405/* If there are any fallback hosts listed, build a chain of host items
406for them, but do not do any lookups at this time. */
407
408host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
409}
410
411
412
413
414
415/*************************************************
416* Set delivery info into all active addresses *
417*************************************************/
418
419/* Only addresses whose status is >= PENDING are relevant. A lesser
420status means that an address is not currently being processed.
421
422Arguments:
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423 addrlist points to a chain of addresses
424 errno_value to put in each address's errno field
425 msg to put in each address's message field
426 rc to put in each address's transport_return field
427 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 428 host if set, mark addrs as having used this host
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429 smtp_greeting from peer
430 helo_response from peer
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431
432If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
433the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
434this particular type of timeout.
435
436Returns: nothing
437*/
438
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439static void
440set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
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441 BOOL pass_message, host_item * host
442#ifdef EXPERIMENTAL_DSN_INFO
443 , const uschar * smtp_greeting, const uschar * helo_response
444#endif
445 )
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446{
447address_item *addr;
448int orvalue = 0;
449if (errno_value == ERRNO_CONNECTTIMEOUT)
450 {
451 errno_value = ETIMEDOUT;
452 orvalue = RTEF_CTOUT;
453 }
895fbaf2 454for (addr = addrlist; addr; addr = addr->next)
168dec3b 455 if (addr->transport_return >= PENDING)
447d236c 456 {
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457 addr->basic_errno = errno_value;
458 addr->more_errno |= orvalue;
02b41d71 459 if (msg)
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460 {
461 addr->message = msg;
462 if (pass_message) setflag(addr, af_pass_message);
463 }
464 addr->transport_return = rc;
465 if (host)
895fbaf2 466 {
168dec3b 467 addr->host_used = host;
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468#ifdef EXPERIMENTAL_DSN_INFO
469 if (smtp_greeting)
470 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
471 addr->smtp_greeting = smtp_greeting;
472
473 if (helo_response)
474 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
475 addr->helo_response = helo_response;
476#endif
477 }
447d236c 478 }
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479}
480
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481static void
482set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
483 BOOL pass_message)
484{
485set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
486#ifdef EXPERIMENTAL_DSN_INFO
487 , NULL, NULL
488#endif
489 );
490}
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491
492
493/*************************************************
494* Check an SMTP response *
495*************************************************/
496
497/* This function is given an errno code and the SMTP response buffer
498to analyse, together with the host identification for generating messages. It
499sets an appropriate message and puts the first digit of the response code into
500the yield variable. If no response was actually read, a suitable digit is
501chosen.
502
503Arguments:
447d236c
PH
504 host the current host, to get its name for messages
505 errno_value pointer to the errno value
506 more_errno from the top address for use with ERRNO_FILTER_FAIL
507 buffer the SMTP response buffer
508 yield where to put a one-digit SMTP response code
4c04137d 509 message where to put an error message
447d236c
PH
510 pass_message set TRUE if message is an SMTP response
511
512Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
513*/
514
a7538db1
JH
515static BOOL
516check_response(host_item *host, int *errno_value, int more_errno,
447d236c 517 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c 518{
0d9fa8c0 519uschar * pl = pipelining_active ? US"pipelined " : US"";
e9166683 520const uschar * s;
0756eb3c
PH
521
522*yield = '4'; /* Default setting is to give a temporary error */
523
e9166683 524switch(*errno_value)
0756eb3c 525 {
e9166683
JH
526 case ETIMEDOUT: /* Handle response timeout */
527 *message = US string_sprintf("SMTP timeout after %s%s",
528 pl, smtp_command);
529 if (transport_count > 0)
530 *message = US string_sprintf("%s (%d bytes written)", *message,
531 transport_count);
532 return FALSE;
533
534 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
535 s = string_printing(buffer);
536 while (isspace(*s)) s++;
537 *message = *s == 0
538 ? string_sprintf("Malformed SMTP reply (an empty line) "
539 "in response to %s%s", pl, smtp_command)
540 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
541 pl, smtp_command, s);
542 return FALSE;
543
544 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
545 can't send QUIT as we mustn't end the DATA. */
546 *message = string_sprintf("transport filter process failed (%d)%s",
547 more_errno,
548 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
549 return FALSE;
550
551 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
552 can't send QUIT as we mustn't end the DATA. */
553 *message =
554 string_sprintf("failed to expand headers_add or headers_remove: %s",
555 expand_string_message);
556 return FALSE;
557
558 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
559 *message = string_sprintf("failed to write a data block");
560 return FALSE;
0756eb3c 561
8c5d388a 562#ifdef SUPPORT_I18N
e9166683
JH
563 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
564 *message = US"utf8 support required but not offered for forwarding";
565 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
566 return TRUE;
250b6871 567#endif
e9166683 568 }
250b6871 569
0756eb3c
PH
570/* Handle error responses from the remote mailer. */
571
572if (buffer[0] != 0)
573 {
e9166683
JH
574 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
575 "%s", pl, smtp_command, s = string_printing(buffer));
447d236c 576 *pass_message = TRUE;
0756eb3c
PH
577 *yield = buffer[0];
578 return TRUE;
579 }
580
581/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
582connection closed) case, which causes deferral. An explicit connection reset
583error has the same effect. Otherwise, put the host's identity in the message,
584leaving the errno value to be interpreted as well. In all cases, we have to
585assume the connection is now dead. */
0756eb3c 586
19b9dc85 587if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
588 {
589 *errno_value = ERRNO_SMTPCLOSED;
c562fd30 590 *message = US string_sprintf("Remote host closed connection "
02b41d71 591 "in response to %s%s", pl, smtp_command);
0756eb3c 592 }
de6273b4
JH
593else
594 *message = US string_sprintf("%s [%s]", host->name, host->address);
0756eb3c
PH
595
596return FALSE;
597}
598
599
600
601/*************************************************
602* Write error message to logs *
603*************************************************/
604
605/* This writes to the main log and to the message log.
606
607Arguments:
608 addr the address item containing error information
609 host the current host
610
611Returns: nothing
612*/
613
614static void
615write_logs(address_item *addr, host_item *host)
616{
584ddd64
JH
617uschar * message = LOGGING(outgoing_port)
618 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
619 host->port == PORT_NONE ? 25 : host->port)
620 : string_sprintf("H=%s [%s]", host->name, host->address);
c562fd30
JH
621
622if (addr->message)
0756eb3c 623 {
c562fd30 624 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
625 if (addr->basic_errno > 0)
626 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
627 log_write(0, LOG_MAIN, "%s", message);
628 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
629 }
630else
631 {
37f3dc43
JH
632 const uschar * s = exim_errstr(addr->basic_errno);
633 log_write(0, LOG_MAIN, "%s %s", message, s);
634 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
0756eb3c
PH
635 }
636}
637
c562fd30
JH
638static void
639msglog_line(host_item * host, uschar * message)
640{
37f3dc43
JH
641deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
642 host->name, host->address, message);
c562fd30
JH
643}
644
0756eb3c
PH
645
646
0cbf2b82 647#ifndef DISABLE_EVENT
d68218c7
JH
648/*************************************************
649* Post-defer action *
650*************************************************/
651
652/* This expands an arbitrary per-transport string.
653 It might, for example, be used to write to the database log.
654
655Arguments:
d68218c7
JH
656 addr the address item containing error information
657 host the current host
658
659Returns: nothing
660*/
661
662static void
774ef2d7 663deferred_event_raise(address_item *addr, host_item *host)
d68218c7 664{
774ef2d7 665uschar * action = addr->transport->event_action;
55414b25 666const uschar * save_domain;
a7538db1
JH
667uschar * save_local;
668
d68218c7 669if (!action)
a7538db1 670 return;
d68218c7 671
a7538db1
JH
672save_domain = deliver_domain;
673save_local = deliver_localpart;
674
675/*XXX would ip & port already be set up? */
676deliver_host_address = string_copy(host->address);
774ef2d7
JH
677deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
678event_defer_errno = addr->basic_errno;
d68218c7
JH
679
680router_name = addr->router->name;
681transport_name = addr->transport->name;
a7538db1
JH
682deliver_domain = addr->domain;
683deliver_localpart = addr->local_part;
684
774ef2d7 685(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
686 addr->message
687 ? addr->basic_errno > 0
688 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
689 : string_copy(addr->message)
690 : addr->basic_errno > 0
691 ? string_copy(US strerror(addr->basic_errno))
692 : NULL);
693
694deliver_localpart = save_local;
695deliver_domain = save_domain;
d68218c7
JH
696router_name = transport_name = NULL;
697}
698#endif
699
0756eb3c
PH
700/*************************************************
701* Synchronize SMTP responses *
702*************************************************/
703
704/* This function is called from smtp_deliver() to receive SMTP responses from
705the server, and match them up with the commands to which they relate. When
706PIPELINING is not in use, this function is called after every command, and is
707therefore somewhat over-engineered, but it is simpler to use a single scheme
708that works both with and without PIPELINING instead of having two separate sets
709of code.
710
711The set of commands that are buffered up with pipelining may start with MAIL
712and may end with DATA; in between are RCPT commands that correspond to the
713addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
714etc.) are never buffered.
715
716Errors after MAIL or DATA abort the whole process leaving the response in the
717buffer. After MAIL, pending responses are flushed, and the original command is
718re-instated in big_buffer for error messages. For RCPT commands, the remote is
719permitted to reject some recipient addresses while accepting others. However
720certain errors clearly abort the whole process. Set the value in
721transport_return to PENDING_OK if the address is accepted. If there is a
722subsequent general error, it will get reset accordingly. If not, it will get
723converted to OK at the end.
724
725Arguments:
df5b41e3 726 sx smtp connection context
48c7f9e2 727 count the number of responses to read
48c7f9e2
PH
728 pending_DATA 0 if last command sent was not DATA
729 +1 if previously had a good recipient
730 -1 if not previously had a good recipient
0756eb3c
PH
731
732Returns: 3 if at least one address had 2xx and one had 5xx
733 2 if at least one address had 5xx but none had 2xx
734 1 if at least one host had a 2xx response, but none had 5xx
735 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
736 -1 timeout while reading RCPT response
737 -2 I/O or other non-response error for RCPT
738 -3 DATA or MAIL failed - errno and buffer set
739*/
740
741static int
df5b41e3 742sync_responses(smtp_context * sx, int count, int pending_DATA)
0756eb3c 743{
df5b41e3 744address_item *addr = sx->sync_addr;
e9166683
JH
745smtp_transport_options_block *ob =
746 (smtp_transport_options_block *)sx->tblock->options_block;
0756eb3c
PH
747int yield = 0;
748
749/* Handle the response for a MAIL command. On error, reinstate the original
750command in big_buffer for error message use, and flush any further pending
751responses before returning, except after I/O errors and timeouts. */
752
df5b41e3 753if (sx->pending_MAIL)
0756eb3c
PH
754 {
755 count--;
e9166683
JH
756 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
757 '2', ob->command_timeout))
0756eb3c 758 {
e027f545 759 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
0756eb3c 760 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
df5b41e3 761 if (errno == 0 && sx->buffer[0] != 0)
0756eb3c
PH
762 {
763 uschar flushbuffer[4096];
e97957bc 764 int save_errno = 0;
df5b41e3 765 if (sx->buffer[0] == '4')
e97957bc
PH
766 {
767 save_errno = ERRNO_MAIL4XX;
df5b41e3 768 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e97957bc 769 }
0756eb3c
PH
770 while (count-- > 0)
771 {
df5b41e3 772 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
e9166683 773 '2', ob->command_timeout)
0756eb3c
PH
774 && (errno != 0 || flushbuffer[0] == 0))
775 break;
776 }
e97957bc 777 errno = save_errno;
0756eb3c 778 }
c562fd30
JH
779
780 if (pending_DATA) count--; /* Number of RCPT responses to come */
781 while (count-- > 0) /* Mark any pending addrs with the host used */
782 {
783 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
df5b41e3 784 addr->host_used = sx->host;
c562fd30
JH
785 addr = addr->next;
786 }
0756eb3c
PH
787 return -3;
788 }
789 }
790
791if (pending_DATA) count--; /* Number of RCPT responses to come */
792
793/* Read and handle the required number of RCPT responses, matching each one up
794with an address by scanning for the next address whose status is PENDING_DEFER.
795*/
796
797while (count-- > 0)
798 {
799 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
800
801 /* The address was accepted */
df5b41e3 802 addr->host_used = sx->host;
0756eb3c 803
e9166683
JH
804 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
805 '2', ob->command_timeout))
0756eb3c
PH
806 {
807 yield |= 1;
808 addr->transport_return = PENDING_OK;
809
810 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
811 ensure that any address-specific retry record is expunged. We do this both
812 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
813
814 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
815 {
816 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
817 sender_address);
818 retry_add_item(addr, altkey, rf_delete);
0756eb3c 819 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 820 }
0756eb3c
PH
821 }
822
823 /* Timeout while reading the response */
824
825 else if (errno == ETIMEDOUT)
826 {
c562fd30 827 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
e9166683 828 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
df5b41e3 829 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 830 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 831 update_waiting = FALSE;
0756eb3c
PH
832 return -1;
833 }
834
835 /* Handle other errors in obtaining an SMTP response by returning -1. This
836 will cause all the addresses to be deferred. Restore the SMTP command in
837 big_buffer for which we are checking the response, so the error message
838 makes sense. */
839
df5b41e3 840 else if (errno != 0 || sx->buffer[0] == 0)
0756eb3c
PH
841 {
842 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
df5b41e3 843 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
0756eb3c
PH
844 return -2;
845 }
846
847 /* Handle SMTP permanent and temporary response codes. */
848
849 else
850 {
851 addr->message =
447d236c 852 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
df5b41e3
JH
853 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
854 string_printing(sx->buffer));
447d236c 855 setflag(addr, af_pass_message);
e9166683
JH
856 if (!sx->verify)
857 msglog_line(sx->host, addr->message);
0756eb3c
PH
858
859 /* The response was 5xx */
860
df5b41e3 861 if (sx->buffer[0] == '5')
0756eb3c
PH
862 {
863 addr->transport_return = FAIL;
864 yield |= 2;
865 }
866
867 /* The response was 4xx */
868
869 else
870 {
0756eb3c
PH
871 addr->transport_return = DEFER;
872 addr->basic_errno = ERRNO_RCPT4XX;
df5b41e3 873 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
0756eb3c 874
e9166683
JH
875 if (!sx->verify)
876 {
0cbf2b82 877#ifndef DISABLE_EVENT
e9166683
JH
878 event_defer_errno = addr->more_errno;
879 msg_event_raise(US"msg:rcpt:host:defer", addr);
5ef5dd52
JB
880#endif
881
e9166683
JH
882 /* Log temporary errors if there are more hosts to be tried.
883 If not, log this last one in the == line. */
0756eb3c 884
e9166683
JH
885 if (sx->host->next)
886 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
887 sx->host->name, sx->host->address, addr->message);
0756eb3c 888
0cbf2b82 889#ifndef DISABLE_EVENT
e9166683
JH
890 else
891 msg_event_raise(US"msg:rcpt:defer", addr);
5ef5dd52
JB
892#endif
893
e9166683
JH
894 /* Do not put this message on the list of those waiting for specific
895 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 896
e9166683 897 update_waiting = FALSE;
0756eb3c 898
e9166683
JH
899 /* Add a retry item for the address so that it doesn't get tried again
900 too soon. If address_retry_include_sender is true, add the sender address
901 to the retry key. */
0756eb3c 902
e9166683
JH
903 retry_add_item(addr,
904 ob->address_retry_include_sender
905 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
906 : addr->address_retry_key,
907 0);
908 }
0756eb3c
PH
909 }
910 }
911 } /* Loop for next RCPT response */
912
913/* Update where to start at for the next block of responses, unless we
914have already handled all the addresses. */
915
e9166683 916if (addr) sx->sync_addr = addr->next;
0756eb3c
PH
917
918/* Handle a response to DATA. If we have not had any good recipients, either
919previously or in this block, the response is ignored. */
920
921if (pending_DATA != 0 &&
e9166683
JH
922 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
923 '3', ob->command_timeout))
0756eb3c
PH
924 {
925 int code;
926 uschar *msg;
447d236c 927 BOOL pass_message;
e97957bc
PH
928 if (pending_DATA > 0 || (yield & 1) != 0)
929 {
df5b41e3 930 if (errno == 0 && sx->buffer[0] == '4')
e97957bc
PH
931 {
932 errno = ERRNO_DATA4XX;
df5b41e3 933 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e97957bc
PH
934 }
935 return -3;
936 }
df5b41e3 937 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
0756eb3c
PH
938 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
939 "is in use and there were no good recipients\n", msg);
940 }
941
942/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
943present) received 3xx. If any RCPTs were handled and yielded anything other
944than 4xx, yield will be set non-zero. */
945
946return yield;
947}
948
949
950
fcc8e047
JH
951/* Do the client side of smtp-level authentication */
952/*
953Arguments:
954 buffer EHLO response from server (gets overwritten)
955 addrlist chain of potential addresses to deliver
956 host host to deliver to
957 ob transport options
958 ibp, obp comms channel control blocks
959
960Returns:
961 OK Success, or failed (but not required): global "smtp_authenticated" set
962 DEFER Failed authentication (and was required)
963 ERROR Internal problem
964
965 FAIL_SEND Failed communications - transmit
966 FAIL - response
967*/
968
969int
970smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
971 smtp_transport_options_block *ob, BOOL is_esmtp,
972 smtp_inblock *ibp, smtp_outblock *obp)
973{
a7538db1
JH
974int require_auth;
975uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 976
a7538db1
JH
977smtp_authenticated = FALSE;
978client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 979require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 980
a7538db1
JH
981if (is_esmtp && !regex_AUTH) regex_AUTH =
982 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
983 FALSE, TRUE);
fcc8e047 984
a7538db1
JH
985if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
986 {
987 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
988 expand_nmax = -1; /* reset */
fcc8e047 989
a7538db1
JH
990 /* Must not do this check until after we have saved the result of the
991 regex match above. */
fcc8e047 992
a7538db1 993 if (require_auth == OK ||
5130845b 994 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
995 {
996 auth_instance *au;
997 fail_reason = US"no common mechanisms were found";
fcc8e047 998
a7538db1 999 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1000
a7538db1
JH
1001 /* Scan the configured authenticators looking for one which is configured
1002 for use as a client, which is not suppressed by client_condition, and
1003 whose name matches an authentication mechanism supported by the server.
1004 If one is found, attempt to authenticate by calling its client function.
1005 */
fcc8e047 1006
a7538db1
JH
1007 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
1008 {
1009 uschar *p = names;
1010 if (!au->client ||
1011 (au->client_condition != NULL &&
1012 !expand_check_condition(au->client_condition, au->name,
1013 US"client authenticator")))
1014 {
1015 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1016 au->name,
1017 (au->client)? "client_condition is false" :
1018 "not configured as a client");
1019 continue;
1020 }
fcc8e047 1021
a7538db1 1022 /* Loop to scan supported server mechanisms */
fcc8e047 1023
a7538db1
JH
1024 while (*p != 0)
1025 {
1026 int rc;
1027 int len = Ustrlen(au->public_name);
1028 while (isspace(*p)) p++;
fcc8e047 1029
a7538db1
JH
1030 if (strncmpic(au->public_name, p, len) != 0 ||
1031 (p[len] != 0 && !isspace(p[len])))
1032 {
1033 while (*p != 0 && !isspace(*p)) p++;
1034 continue;
1035 }
fcc8e047 1036
a7538db1
JH
1037 /* Found data for a listed mechanism. Call its client entry. Set
1038 a flag in the outblock so that data is overwritten after sending so
1039 that reflections don't show it. */
fcc8e047 1040
a7538db1
JH
1041 fail_reason = US"authentication attempt(s) failed";
1042 obp->authenticating = TRUE;
1043 rc = (au->info->clientcode)(au, ibp, obp,
1044 ob->command_timeout, buffer, bufsize);
1045 obp->authenticating = FALSE;
1046 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1047 au->name, rc);
fcc8e047 1048
a7538db1
JH
1049 /* A temporary authentication failure must hold up delivery to
1050 this host. After a permanent authentication failure, we carry on
1051 to try other authentication methods. If all fail hard, try to
1052 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1053
a7538db1
JH
1054 switch(rc)
1055 {
1056 case OK:
1057 smtp_authenticated = TRUE; /* stops the outer loop */
1058 client_authenticator = au->name;
1059 if (au->set_client_id != NULL)
1060 client_authenticated_id = expand_string(au->set_client_id);
1061 break;
1062
1063 /* Failure after writing a command */
1064
1065 case FAIL_SEND:
1066 return FAIL_SEND;
1067
1068 /* Failure after reading a response */
1069
1070 case FAIL:
1071 if (errno != 0 || buffer[0] != '5') return FAIL;
1072 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1073 au->name, host->name, host->address, buffer);
1074 break;
1075
1076 /* Failure by some other means. In effect, the authenticator
1077 decided it wasn't prepared to handle this case. Typically this
1078 is the result of "fail" in an expansion string. Do we need to
1079 log anything here? Feb 2006: a message is now put in the buffer
1080 if logging is required. */
1081
1082 case CANCELLED:
1083 if (*buffer != 0)
1084 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1085 "authentication H=%s [%s] %s", au->name, host->name,
1086 host->address, buffer);
1087 break;
1088
1089 /* Internal problem, message in buffer. */
1090
1091 case ERROR:
895fbaf2
JH
1092 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1093 DEFER, FALSE);
a7538db1
JH
1094 return ERROR;
1095 }
fcc8e047 1096
a7538db1
JH
1097 break; /* If not authenticated, try next authenticator */
1098 } /* Loop for scanning supported server mechanisms */
1099 } /* Loop for further authenticators */
fcc8e047 1100 }
a7538db1 1101 }
fcc8e047 1102
a7538db1 1103/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1104
a7538db1
JH
1105if (require_auth == OK && !smtp_authenticated)
1106 {
895fbaf2 1107 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1108 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1109 FALSE);
a7538db1
JH
1110 return DEFER;
1111 }
4d8d62b9 1112
a7538db1 1113return OK;
fcc8e047
JH
1114}
1115
1116
1117/* Construct AUTH appendix string for MAIL TO */
1118/*
1119Arguments
1120 buffer to build string
1121 addrlist chain of potential addresses to deliver
1122 ob transport options
1123
1124Globals smtp_authenticated
1125 client_authenticated_sender
1126Return True on error, otherwise buffer has (possibly empty) terminated string
1127*/
1128
1129BOOL
1130smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1131 smtp_transport_options_block *ob)
1132{
1133uschar *local_authenticated_sender = authenticated_sender;
1134
1135#ifdef notdef
1136 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1137#endif
1138
1139if (ob->authenticated_sender != NULL)
1140 {
1141 uschar *new = expand_string(ob->authenticated_sender);
1142 if (new == NULL)
1143 {
1144 if (!expand_string_forcedfail)
1145 {
1146 uschar *message = string_sprintf("failed to expand "
1147 "authenticated_sender: %s", expand_string_message);
895fbaf2 1148 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH
1149 return TRUE;
1150 }
1151 }
1152 else if (new[0] != 0) local_authenticated_sender = new;
1153 }
1154
1155/* Add the authenticated sender address if present */
1156
1157if ((smtp_authenticated || ob->authenticated_sender_force) &&
1158 local_authenticated_sender != NULL)
1159 {
1160 string_format(buffer, bufsize, " AUTH=%s",
1161 auth_xtextencode(local_authenticated_sender,
1162 Ustrlen(local_authenticated_sender)));
1163 client_authenticated_sender = string_copy(local_authenticated_sender);
1164 }
1165else
1166 *buffer= 0;
1167
1168return FALSE;
1169}
1170
1171
1172
0e66b3b6 1173#ifdef EXPERIMENTAL_DANE
2d5fdd53
JH
1174/* Lookup TLSA record for host/port.
1175Return: OK success with dnssec; DANE mode
1176 DEFER Do not use this host now, may retry later
1177 FAIL_FORCED No TLSA record; DANE not usable
1178 FAIL Do not use this connection
1179*/
1180
0e66b3b6 1181int
4b0fe319 1182tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
0e66b3b6
JH
1183{
1184/* move this out to host.c given the similarity to dns_lookup() ? */
1185uschar buffer[300];
55414b25 1186const uschar * fullname = buffer;
0e66b3b6
JH
1187
1188/* TLSA lookup string */
1189(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1190
1191switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
1192 {
0e66b3b6
JH
1193 case DNS_SUCCEED:
1194 if (!dns_is_secure(dnsa))
1195 {
1196 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1197 return DEFER;
1198 }
4b0fe319 1199 return OK;
2d5fdd53
JH
1200
1201 case DNS_AGAIN:
1202 return DEFER; /* just defer this TLS'd conn */
1203
ef3a1a30
JH
1204 case DNS_NODATA: /* no TLSA RR for this lookup */
1205 case DNS_NOMATCH: /* no records at all for this lookup */
2d5fdd53
JH
1206 return dane_required ? FAIL : FAIL_FORCED;
1207
1208 default:
1209 case DNS_FAIL:
1210 return dane_required ? FAIL : DEFER;
0e66b3b6 1211 }
0e66b3b6
JH
1212}
1213#endif
1214
1215
a39bd74d
JB
1216
1217typedef struct smtp_compare_s
1218{
1219 uschar *current_sender_address;
1220 struct transport_instance *tblock;
1221} smtp_compare_t;
1222
d093f8e5
JH
1223
1224/* Create a unique string that identifies this message, it is based on
1225sender_address, helo_data and tls_certificate if enabled.
1226*/
a39bd74d
JB
1227
1228static uschar *
1229smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1230{
1231address_item * addr1;
1232uschar * if1 = US"";
1233uschar * helo1 = US"";
1234#ifdef SUPPORT_TLS
1235uschar * tlsc1 = US"";
1236#endif
1237uschar * save_sender_address = sender_address;
1238uschar * local_identity = NULL;
1239smtp_transport_options_block * ob =
1240 (smtp_transport_options_block *)tblock->options_block;
1241
1242sender_address = sender;
1243
1244addr1 = deliver_make_addr (sender, TRUE);
1245deliver_set_expansions(addr1);
1246
1247if (ob->interface)
1248 if1 = expand_string(ob->interface);
1249
1250if (ob->helo_data)
1251 helo1 = expand_string(ob->helo_data);
1252
1253#ifdef SUPPORT_TLS
1254if (ob->tls_certificate)
1255 tlsc1 = expand_string(ob->tls_certificate);
1256local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1257#else
1258local_identity = string_sprintf ("%s^%s", if1, helo1);
1259#endif
1260
1261deliver_set_expansions(NULL);
1262sender_address = save_sender_address;
1263
1264return local_identity;
1265}
1266
1267
1268
1269/* This routine is a callback that is called from transport_check_waiting.
1270This function will evaluate the incoming message versus the previous
1271message. If the incoming message is using a different local identity then
1272we will veto this new message. */
1273
1274static BOOL
1275smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1276{
dadff1d4
HSHR
1277uschar * message_local_identity,
1278 * current_local_identity,
1279 * new_sender_address;
1280
1281current_local_identity =
a39bd74d 1282 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1283
dadff1d4
HSHR
1284if (!(new_sender_address = deliver_get_sender_address(message_id)))
1285 return 0;
1286
1287message_local_identity =
1288 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1289
1290return Ustrcmp(current_local_identity, message_local_identity) == 0;
1291}
1292
1293
1294
e9166683
JH
1295static uschar
1296ehlo_response(uschar * buf, uschar checks)
9094b84b 1297{
e9166683
JH
1298size_t bsize = Ustrlen(buf);
1299
9094b84b 1300#ifdef SUPPORT_TLS
ff5aac2b
JH
1301if ( checks & PEER_OFFERED_TLS
1302 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1303 checks &= ~PEER_OFFERED_TLS;
9094b84b
JH
1304#endif
1305
ff5aac2b
JH
1306if ( checks & PEER_OFFERED_IGNQ
1307 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1308 PCRE_EOPT, NULL, 0) < 0)
1309 checks &= ~PEER_OFFERED_IGNQ;
9094b84b 1310
f98442df
JH
1311if ( checks & PEER_OFFERED_CHUNKING
1312 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1313 checks &= ~PEER_OFFERED_CHUNKING;
1314
9094b84b 1315#ifndef DISABLE_PRDR
ff5aac2b
JH
1316if ( checks & PEER_OFFERED_PRDR
1317 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1318 checks &= ~PEER_OFFERED_PRDR;
9094b84b
JH
1319#endif
1320
1321#ifdef SUPPORT_I18N
ff5aac2b
JH
1322if ( checks & PEER_OFFERED_UTF8
1323 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1324 checks &= ~PEER_OFFERED_UTF8;
9094b84b
JH
1325#endif
1326
ff5aac2b
JH
1327if ( checks & PEER_OFFERED_DSN
1328 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1329 checks &= ~PEER_OFFERED_DSN;
9094b84b 1330
ff5aac2b
JH
1331if ( checks & PEER_OFFERED_PIPE
1332 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1333 PCRE_EOPT, NULL, 0) < 0)
1334 checks &= ~PEER_OFFERED_PIPE;
9094b84b 1335
ff5aac2b
JH
1336if ( checks & PEER_OFFERED_SIZE
1337 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
1338 checks &= ~PEER_OFFERED_SIZE;
9094b84b
JH
1339
1340return checks;
1341}
1342
1343
6d5c916c
JH
1344
1345/* Callback for emitting a BDAT data chunk header.
6d5c916c 1346
e027f545
JH
1347If given a nonzero size, first flush any buffered SMTP commands
1348then emit the command.
1349
d2aa036b
JH
1350Reap previous SMTP command responses if requested, and always reap
1351the response from a previous BDAT command.
1352
1353Args:
1354 tctx transport context
1355 chunk_size value for SMTP BDAT command
1356 flags
1357 tc_chunk_last add LAST option to SMTP BDAT command
1358 tc_reap_prev reap response to previous SMTP commands
6d5c916c
JH
1359
1360Returns: OK or ERROR
1361*/
1362
1363static int
d2aa036b
JH
1364smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1365 unsigned flags)
6d5c916c
JH
1366{
1367smtp_transport_options_block * ob =
1368 (smtp_transport_options_block *)(tctx->tblock->options_block);
e9166683 1369smtp_context * sx = tctx->smtp_context;
e027f545
JH
1370int cmd_count = 0;
1371int prev_cmd_count;
6d5c916c 1372
e027f545 1373/* Write SMTP chunk header command */
6d5c916c 1374
e027f545 1375if (chunk_size > 0)
87cb4a16 1376 {
e9166683 1377 if((cmd_count = smtp_write_command(&sx->outblock, FALSE, "BDAT %u%s\r\n",
e027f545
JH
1378 chunk_size,
1379 flags & tc_chunk_last ? " LAST" : "")
1380 ) < 0) return ERROR;
87cb4a16
JH
1381 if (flags & tc_chunk_last)
1382 data_command = string_copy(big_buffer); /* Save for later error message */
1383 }
e027f545 1384
e9166683 1385prev_cmd_count = cmd_count += sx->cmd_count;
6d5c916c 1386
e027f545 1387/* Reap responses for any previous, but not one we just emitted */
6d5c916c 1388
e027f545
JH
1389if (chunk_size > 0)
1390 prev_cmd_count--;
e9166683 1391if (sx->pending_BDAT)
e027f545 1392 prev_cmd_count--;
6d5c916c 1393
e027f545 1394if (flags & tc_reap_prev && prev_cmd_count > 0)
6d5c916c 1395 {
58fc5fb2
JH
1396 DEBUG(D_transport) debug_printf("look for %d responses"
1397 " for previous pipelined cmds\n", prev_cmd_count);
6d5c916c 1398
e9166683 1399 switch(sync_responses(sx, prev_cmd_count, 0))
e027f545
JH
1400 {
1401 case 1: /* 2xx (only) => OK */
e9166683
JH
1402 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1403 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
e027f545
JH
1404 case 0: break; /* No 2xx or 5xx, but no probs */
1405
1406 case -1: /* Timeout on RCPT */
1407 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1408 }
1409 cmd_count = 1;
e9166683 1410 if (!sx->pending_BDAT)
e027f545 1411 pipelining_active = FALSE;
6d5c916c 1412 }
e027f545 1413
58fc5fb2 1414/* Reap response for an outstanding BDAT */
e027f545 1415
e9166683 1416if (sx->pending_BDAT)
e027f545 1417 {
58fc5fb2
JH
1418 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1419
e9166683 1420 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
e027f545
JH
1421 ob->command_timeout))
1422 {
e9166683 1423 if (errno == 0 && sx->buffer[0] == '4')
e027f545
JH
1424 {
1425 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
36e55f49 1426 sx->addrlist->more_errno |=
e9166683 1427 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e027f545
JH
1428 }
1429 return ERROR;
1430 }
1431 cmd_count--;
e9166683 1432 sx->pending_BDAT = FALSE;
e027f545
JH
1433 pipelining_active = FALSE;
1434 }
1435else if (chunk_size > 0)
e9166683 1436 sx->pending_BDAT = TRUE;
e027f545
JH
1437
1438
e9166683 1439sx->cmd_count = cmd_count;
e027f545 1440return OK;
6d5c916c
JH
1441}
1442
1443
1444
0756eb3c 1445/*************************************************
d093f8e5 1446* Make connection for given message *
0756eb3c
PH
1447*************************************************/
1448
d093f8e5
JH
1449/*
1450Arguments:
1451 ctx connection context
d093f8e5
JH
1452 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1453 a second attempt after TLS initialization fails
d093f8e5
JH
1454
1455Returns: OK - the connection was made and the delivery attempted;
1456 fd is set in the conn context, tls_out set up.
1457 DEFER - the connection could not be made, or something failed
1458 while setting up the SMTP session, or there was a
1459 non-message-specific error, such as a timeout.
1460 ERROR - helo_data or add_headers or authenticated_sender is
1461 specified for this transport, and the string failed
1462 to expand
1463*/
1464int
e9166683 1465smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
d093f8e5
JH
1466{
1467#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1468dns_answer tlsa_dnsa;
1469#endif
1470BOOL pass_message = FALSE;
d093f8e5 1471uschar * message = NULL;
d093f8e5
JH
1472int yield = OK;
1473int rc;
1474
02b41d71 1475sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
d093f8e5
JH
1476
1477sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1478sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1479sx->ok = FALSE;
1480sx->send_rset = TRUE;
1481sx->send_quit = TRUE;
1482sx->setting_up = TRUE;
1483sx->esmtp = TRUE;
1484sx->esmtp_sent = FALSE;
59a286ef 1485#ifdef SUPPORT_I18N
d093f8e5 1486sx->utf8_needed = FALSE;
59a286ef 1487#endif
d093f8e5 1488sx->dsn_all_lasthop = TRUE;
59a286ef 1489#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
d093f8e5
JH
1490sx->dane = FALSE;
1491sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1492#endif
1493
1494if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
d093f8e5
JH
1495sx->peer_offered = 0;
1496sx->igquotstr = US"";
02b41d71 1497if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
d093f8e5
JH
1498#ifdef EXPERIMENTAL_DSN_INFO
1499sx->smtp_greeting = NULL;
1500sx->helo_response = NULL;
59a286ef
JH
1501#endif
1502
0756eb3c 1503smtp_command = US"initial connection";
d093f8e5 1504sx->buffer[0] = '\0';
0756eb3c
PH
1505
1506/* Set up the buffer for reading SMTP response packets. */
1507
d093f8e5
JH
1508sx->inblock.buffer = sx->inbuffer;
1509sx->inblock.buffersize = sizeof(sx->inbuffer);
1510sx->inblock.ptr = sx->inbuffer;
1511sx->inblock.ptrend = sx->inbuffer;
0756eb3c
PH
1512
1513/* Set up the buffer for holding SMTP commands while pipelining */
1514
d093f8e5
JH
1515sx->outblock.buffer = sx->outbuffer;
1516sx->outblock.buffersize = sizeof(sx->outbuffer);
1517sx->outblock.ptr = sx->outbuffer;
1518sx->outblock.cmd_count = 0;
1519sx->outblock.authenticating = FALSE;
0756eb3c 1520
6c512171
PH
1521/* Reset the parameters of a TLS session. */
1522
817d9f57
JH
1523tls_out.bits = 0;
1524tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1525tls_out.ourcert = NULL;
1526tls_out.peercert = NULL;
817d9f57
JH
1527tls_out.peerdn = NULL;
1528#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1529tls_out.sni = NULL;
5b456975 1530#endif
018058b2 1531tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1532
35aba663
JH
1533/* Flip the legacy TLS-related variables over to the outbound set in case
1534they're used in the context of the transport. Don't bother resetting
02b41d71
JH
1535afterward (when being used by a transport) as we're in a subprocess.
1536For verify, unflipped once the callout is dealt with */
35aba663
JH
1537
1538tls_modify_variables(&tls_out);
1539
061b7ebd 1540#ifndef SUPPORT_TLS
d093f8e5 1541if (sx->smtps)
061b7ebd 1542 {
d093f8e5 1543 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
895fbaf2 1544 DEFER, FALSE);
018058b2 1545 return ERROR;
061b7ebd
PP
1546 }
1547#endif
1548
0756eb3c
PH
1549/* Make a connection to the host if this isn't a continued delivery, and handle
1550the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1551specially so they can be identified for retries. */
1552
1553if (continue_hostname == NULL)
1554 {
e9166683 1555 if (sx->verify)
02b41d71
JH
1556 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1557
a7538db1 1558 /* This puts port into host->port */
d093f8e5
JH
1559 sx->inblock.sock = sx->outblock.sock =
1560 smtp_connect(sx->host, sx->host_af, sx->port, sx->interface,
1561 sx->ob->connect_timeout, sx->tblock);
4311097e 1562
d093f8e5 1563 if (sx->inblock.sock < 0)
0756eb3c 1564 {
02b41d71 1565 uschar * msg = NULL;
e9166683 1566 if (sx->verify)
02b41d71 1567 {
863bd541 1568 msg = US strerror(errno);
02b41d71
JH
1569 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1570 }
1571 set_errno_nohost(sx->addrlist,
829dd842 1572 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
e9166683 1573 sx->verify ? string_sprintf("could not connect: %s", msg)
02b41d71
JH
1574 : NULL,
1575 DEFER, FALSE);
1576 sx->send_quit = FALSE;
0756eb3c
PH
1577 return DEFER;
1578 }
1579
0e66b3b6
JH
1580#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1581 {
0e66b3b6
JH
1582 tls_out.dane_verified = FALSE;
1583 tls_out.tlsa_usage = 0;
1584
d093f8e5 1585 if (sx->host->dnssec == DS_YES)
0e66b3b6 1586 {
d093f8e5
JH
1587 if( sx->dane_required
1588 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
0e66b3b6 1589 )
d093f8e5 1590 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
4b0fe319 1591 {
d093f8e5 1592 case OK: sx->dane = TRUE; break;
2d5fdd53 1593 case FAIL_FORCED: break;
d093f8e5 1594 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2d5fdd53
JH
1595 string_sprintf("DANE error: tlsa lookup %s",
1596 rc == DEFER ? "DEFER" : "FAIL"),
1597 rc, FALSE);
1598 return rc;
4b0fe319 1599 }
0e66b3b6 1600 }
d093f8e5 1601 else if (sx->dane_required)
0e66b3b6 1602 {
d093f8e5
JH
1603 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1604 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
895fbaf2 1605 FAIL, FALSE);
4b0fe319 1606 return FAIL;
0e66b3b6
JH
1607 }
1608
d093f8e5
JH
1609 if (sx->dane)
1610 sx->ob->tls_tempfail_tryclear = FALSE;
0e66b3b6
JH
1611 }
1612#endif /*DANE*/
1613
41c7c167
PH
1614 /* Expand the greeting message while waiting for the initial response. (Makes
1615 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1616 delayed till here so that $sending_interface and $sending_port are set. */
1617
02b41d71
JH
1618 if (sx->helo_data)
1619 if (!(sx->helo_data = expand_string(sx->helo_data)))
e9166683 1620 if (sx->verify)
02b41d71
JH
1621 log_write(0, LOG_MAIN|LOG_PANIC,
1622 "<%s>: failed to expand transport's helo_data value for callout: %s",
1623 sx->addrlist->address, expand_string_message);
1624
8c5d388a 1625#ifdef SUPPORT_I18N
d093f8e5 1626 if (sx->helo_data)
810d16ad 1627 {
02b41d71
JH
1628 expand_string_message = NULL;
1629 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1630 &expand_string_message)),
1631 expand_string_message)
e9166683 1632 if (sx->verify)
02b41d71
JH
1633 log_write(0, LOG_MAIN|LOG_PANIC,
1634 "<%s>: failed to expand transport's helo_data value for callout: %s",
1635 sx->addrlist->address, expand_string_message);
1636 else
1637 sx->helo_data = NULL;
810d16ad
JH
1638 }
1639#endif
41c7c167 1640
0756eb3c
PH
1641 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1642 is nevertheless a reasonably clean way of programming this kind of logic,
1643 where you want to escape on any error. */
1644
d093f8e5 1645 if (!sx->smtps)
061b7ebd 1646 {
8d330698
JH
1647 BOOL good_response;
1648
1649#ifdef TCP_QUICKACK
d093f8e5 1650 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
8d330698 1651#endif
d093f8e5
JH
1652 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1653 '2', sx->ob->command_timeout);
895fbaf2 1654#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1655 sx->smtp_greeting = string_copy(sx->buffer);
895fbaf2
JH
1656#endif
1657 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1658
0cbf2b82 1659#ifndef DISABLE_EVENT
b30275b8 1660 {
805c9d53 1661 uschar * s;
d093f8e5
JH
1662 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1663 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1664 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
b30275b8 1665 if (s)
a7538db1 1666 {
d093f8e5 1667 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
b30275b8 1668 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1669 DEFER, FALSE);
a7538db1
JH
1670 yield = DEFER;
1671 goto SEND_QUIT;
1672 }
b30275b8 1673 }
a7538db1
JH
1674#endif
1675
061b7ebd
PP
1676 /* Now check if the helo_data expansion went well, and sign off cleanly if
1677 it didn't. */
41c7c167 1678
d093f8e5 1679 if (!sx->helo_data)
061b7ebd 1680 {
d093f8e5 1681 message = string_sprintf("failed to expand helo_data: %s",
061b7ebd 1682 expand_string_message);
d093f8e5 1683 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP
1684 yield = DEFER;
1685 goto SEND_QUIT;
1686 }
41c7c167
PH
1687 }
1688
0756eb3c 1689/** Debugging without sending a message
d093f8e5 1690sx->addrlist->transport_return = DEFER;
0756eb3c
PH
1691goto SEND_QUIT;
1692**/
1693
1694 /* Errors that occur after this point follow an SMTP command, which is
1695 left in big_buffer by smtp_write_command() for use in error messages. */
1696
1697 smtp_command = big_buffer;
1698
1699 /* Tell the remote who we are...
1700
1701 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1702 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1703 greeting is of this form. The assumption was that the far end supports it
1704 properly... but experience shows that there are some that give 5xx responses,
1705 even though the banner includes "ESMTP" (there's a bloody-minded one that
1706 says "ESMTP not spoken here"). Cope with that case.
1707
1708 September 2000: Time has passed, and it seems reasonable now to always send
1709 EHLO at the start. It is also convenient to make the change while installing
1710 the TLS stuff.
1711
1712 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1713 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1714 would be no way to send out the mails, so there is now a host list
1715 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1716 PIPELINING problem as well. Maybe it can also be useful to cure other
1717 problems with broken servers.
1718
1719 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1720 Then somebody tried it with a Microsoft mailer... It seems that all other
1721 mailers use upper case for some reason (the RFC is quite clear about case
1722 independence) so, for peace of mind, I gave in. */
1723
d093f8e5 1724 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
0756eb3c 1725
061b7ebd
PP
1726 /* Alas; be careful, since this goto is not an error-out, so conceivably
1727 we might set data between here and the target which we assume to exist
1728 and be usable. I can see this coming back to bite us. */
a7538db1 1729#ifdef SUPPORT_TLS
d093f8e5 1730 if (sx->smtps)
061b7ebd 1731 {
2d14f397 1732 smtp_peer_options |= PEER_OFFERED_TLS;
061b7ebd 1733 suppress_tls = FALSE;
d093f8e5 1734 sx->ob->tls_tempfail_tryclear = FALSE;
061b7ebd
PP
1735 smtp_command = US"SSL-on-connect";
1736 goto TLS_NEGOTIATE;
1737 }
a7538db1 1738#endif
061b7ebd 1739
d093f8e5 1740 if (sx->esmtp)
0756eb3c 1741 {
d093f8e5
JH
1742 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1743 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
0756eb3c 1744 goto SEND_FAILED;
d093f8e5
JH
1745 sx->esmtp_sent = TRUE;
1746 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1747 sx->ob->command_timeout))
0756eb3c 1748 {
d093f8e5 1749 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
895fbaf2
JH
1750 {
1751#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1752 sx->helo_response = string_copy(sx->buffer);
895fbaf2
JH
1753#endif
1754 goto RESPONSE_FAILED;
1755 }
d093f8e5 1756 sx->esmtp = FALSE;
0756eb3c 1757 }
895fbaf2 1758#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1759 sx->helo_response = string_copy(sx->buffer);
895fbaf2 1760#endif
0756eb3c
PH
1761 }
1762 else
0756eb3c
PH
1763 DEBUG(D_transport)
1764 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
0756eb3c 1765
d093f8e5 1766 if (!sx->esmtp)
0756eb3c 1767 {
895fbaf2 1768 BOOL good_response;
d093f8e5
JH
1769 int n = sizeof(sx->buffer);
1770 uschar * rsp = sx->buffer;
a57ce043 1771
d093f8e5
JH
1772 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1773 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
895fbaf2 1774
d093f8e5 1775 if (smtp_write_command(&sx->outblock, FALSE, "HELO %s\r\n", sx->helo_data) < 0)
0756eb3c 1776 goto SEND_FAILED;
d093f8e5
JH
1777 good_response = smtp_read_response(&sx->inblock, rsp, n,
1778 '2', sx->ob->command_timeout);
895fbaf2 1779#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1780 sx->helo_response = string_copy(rsp);
895fbaf2 1781#endif
a57ce043
JH
1782 if (!good_response)
1783 {
1784 /* Handle special logging for a closed connection after HELO
1785 when had previously sent EHLO */
1786
d093f8e5 1787 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
a57ce043 1788 {
de6273b4
JH
1789 errno = ERRNO_SMTPCLOSED;
1790 goto EHLOHELO_FAILED;
a57ce043 1791 }
d093f8e5 1792 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
a57ce043
JH
1793 goto RESPONSE_FAILED;
1794 }
0756eb3c
PH
1795 }
1796
d093f8e5 1797 sx->peer_offered = smtp_peer_options = 0;
2d14f397 1798
d093f8e5 1799 if (sx->esmtp || sx->lmtp)
2d14f397 1800 {
e9166683 1801 sx->peer_offered = ehlo_response(sx->buffer,
ff5aac2b 1802 PEER_OFFERED_TLS /* others checked later */
9094b84b 1803 );
f1513293 1804
0756eb3c
PH
1805 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1806
a7538db1 1807#ifdef SUPPORT_TLS
d093f8e5 1808 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_TLS;
7ade712c 1809#endif
2d14f397 1810 }
0756eb3c
PH
1811 }
1812
57cc2785
JH
1813/* For continuing deliveries down the same channel, having re-exec'd the socket
1814is the standard input; for a socket held open from verify it is recorded
1815in the cutthrough context block. Either way we don't need to redo EHLO here
1816(but may need to do so for TLS - see below).
1817Set up the pointer to where subsequent commands will be left, for
2d14f397 1818error messages. Note that smtp_peer_options will have been
0756eb3c
PH
1819set from the command line if they were set in the process that passed the
1820connection on. */
1821
895fbaf2 1822/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
4c04137d 1823as the continue goes via transport_pass_socket() and doublefork and exec.
895fbaf2
JH
1824It does not wait. Unclear how we keep separate host's responses
1825separate - we could match up by host ip+port as a bodge. */
1826
0756eb3c
PH
1827else
1828 {
57cc2785
JH
1829 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1830 {
1831 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1832 sx->host->port = sx->port = cutthrough.host.port;
1833 }
1834 else
1835 {
1836 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
1837 sx->host->port = sx->port; /* Record the port that was used */
1838 }
0756eb3c 1839 smtp_command = big_buffer;
02b41d71 1840 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
875512a3 1841
57cc2785
JH
1842 /* For a continued connection with TLS being proxied for us, or a
1843 held-open verify connection with TLS, nothing more to do. */
875512a3 1844
57cc2785
JH
1845 if ( continue_proxy_cipher
1846 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1847 )
875512a3
JH
1848 {
1849 sx->peer_offered = smtp_peer_options;
1850 pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
57cc2785
JH
1851 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1852 continue_proxy_cipher ? "proxied" : "verify conn with");
875512a3
JH
1853 return OK;
1854 }
1855 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
0756eb3c
PH
1856 }
1857
1858/* If TLS is available on this connection, whether continued or not, attempt to
1859start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1860send another EHLO - the server may give a different answer in secure mode. We
1861use a separate buffer for reading the response to STARTTLS so that if it is
1862negative, the original EHLO data is available for subsequent analysis, should
1863the client not be required to use TLS. If the response is bad, copy the buffer
1864for error analysis. */
1865
1866#ifdef SUPPORT_TLS
2d14f397 1867if ( smtp_peer_options & PEER_OFFERED_TLS
5130845b 1868 && !suppress_tls
02b41d71 1869 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
e9166683 1870 && ( !sx->verify
02b41d71
JH
1871 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1872 ) )
0756eb3c
PH
1873 {
1874 uschar buffer2[4096];
d093f8e5 1875 if (smtp_write_command(&sx->outblock, FALSE, "STARTTLS\r\n") < 0)
0756eb3c
PH
1876 goto SEND_FAILED;
1877
1878 /* If there is an I/O error, transmission of this message is deferred. If
1879 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1880 false, we also defer. However, if there is a temporary rejection of STARTTLS
1881 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1882 STARTTLS, we carry on. This means we will try to send the message in clear,
1883 unless the host is in hosts_require_tls (tested below). */
1884
d093f8e5
JH
1885 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1886 sx->ob->command_timeout))
0756eb3c 1887 {
4b0fe319
JH
1888 if ( errno != 0
1889 || buffer2[0] == 0
d093f8e5 1890 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
4b0fe319 1891 )
0dda4340 1892 {
d093f8e5 1893 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
9e7e0f6a 1894 sx->buffer[sizeof(sx->buffer)-1] = '\0';
0756eb3c 1895 goto RESPONSE_FAILED;
0dda4340 1896 }
0756eb3c
PH
1897 }
1898
1899 /* STARTTLS accepted: try to negotiate a TLS session. */
1900
1901 else
061b7ebd 1902 TLS_NEGOTIATE:
0756eb3c 1903 {
d093f8e5 1904 address_item * addr;
cf0c6164
JH
1905 uschar * errstr;
1906 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
0e66b3b6 1907# ifdef EXPERIMENTAL_DANE
cf0c6164 1908 sx->dane ? &tlsa_dnsa : NULL,
0e66b3b6 1909# endif
cf0c6164 1910 &errstr);
0756eb3c
PH
1911
1912 /* TLS negotiation failed; give an error. From outside, this function may
1913 be called again to try in clear on a new connection, if the options permit
1914 it for this host. */
1915
1916 if (rc != OK)
1917 {
6ebd79ec 1918# ifdef EXPERIMENTAL_DANE
d093f8e5 1919 if (sx->dane) log_write(0, LOG_MAIN,
cf0c6164
JH
1920 "DANE attempt failed; TLS connection to %s [%s]: %s",
1921 sx->host->name, sx->host->address, errstr);
6ebd79ec
JH
1922# endif
1923
de6273b4 1924 errno = ERRNO_TLSFAILURE;
cf0c6164 1925 message = string_sprintf("TLS session: %s", errstr);
d093f8e5 1926 sx->send_quit = FALSE;
0756eb3c
PH
1927 goto TLS_FAILED;
1928 }
1929
1930 /* TLS session is set up */
1931
2d14f397 1932 smtp_peer_options_wrap = smtp_peer_options;
d093f8e5 1933 for (addr = sx->addrlist; addr; addr = addr->next)
5ca2a9a1
PH
1934 if (addr->transport_return == PENDING_DEFER)
1935 {
817d9f57 1936 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1937 addr->ourcert = tls_out.ourcert;
1938 addr->peercert = tls_out.peercert;
817d9f57 1939 addr->peerdn = tls_out.peerdn;
018058b2 1940 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1941 }
0756eb3c
PH
1942 }
1943 }
1944
061b7ebd
PP
1945/* if smtps, we'll have smtp_command set to something else; always safe to
1946reset it here. */
1947smtp_command = big_buffer;
1948
41c7c167
PH
1949/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1950helo_data is null, we are dealing with a connection that was passed from
1951another process, and so we won't have expanded helo_data above. We have to
1952expand it here. $sending_ip_address and $sending_port are set up right at the
1953start of the Exim process (in exim.c). */
0756eb3c 1954
817d9f57 1955if (tls_out.active >= 0)
0756eb3c 1956 {
061b7ebd 1957 char *greeting_cmd;
895fbaf2
JH
1958 BOOL good_response;
1959
d093f8e5 1960 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
41c7c167 1961 {
d093f8e5
JH
1962 uschar *message = string_sprintf("failed to expand helo_data: %s",
1963 expand_string_message);
1964 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1965 yield = DEFER;
1966 goto SEND_QUIT;
41c7c167
PH
1967 }
1968
0d0e4455 1969 /* For SMTPS we need to wait for the initial OK response. */
d093f8e5 1970 if (sx->smtps)
061b7ebd 1971 {
d093f8e5
JH
1972 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1973 '2', sx->ob->command_timeout);
895fbaf2 1974#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1975 sx->smtp_greeting = string_copy(sx->buffer);
895fbaf2
JH
1976#endif
1977 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP
1978 }
1979
d093f8e5 1980 if (sx->esmtp)
0d0e4455
PP
1981 greeting_cmd = "EHLO";
1982 else
1983 {
1984 greeting_cmd = "HELO";
1985 DEBUG(D_transport)
1986 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1987 }
1988
d093f8e5
JH
1989 if (smtp_write_command(&sx->outblock, FALSE, "%s %s\r\n",
1990 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
0756eb3c 1991 goto SEND_FAILED;
d093f8e5
JH
1992 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1993 '2', sx->ob->command_timeout);
895fbaf2 1994#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1995 sx->helo_response = string_copy(sx->buffer);
895fbaf2
JH
1996#endif
1997 if (!good_response) goto RESPONSE_FAILED;
2d14f397 1998 smtp_peer_options = 0;
0756eb3c
PH
1999 }
2000
2001/* If the host is required to use a secure channel, ensure that we
2002have one. */
2003
d093f8e5 2004else if ( sx->smtps
0e66b3b6 2005# ifdef EXPERIMENTAL_DANE
d093f8e5 2006 || sx->dane
0e66b3b6 2007# endif
d093f8e5 2008 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
7a31d643 2009 )
0756eb3c 2010 {
de6273b4 2011 errno = ERRNO_TLSREQUIRED;
c562fd30 2012 message = string_sprintf("a TLS session is required, but %s",
2d14f397
JH
2013 smtp_peer_options & PEER_OFFERED_TLS
2014 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
0756eb3c
PH
2015 goto TLS_FAILED;
2016 }
0e66b3b6 2017#endif /*SUPPORT_TLS*/
0756eb3c
PH
2018
2019/* If TLS is active, we have just started it up and re-done the EHLO command,
2020so its response needs to be analyzed. If TLS is not active and this is a
2021continued session down a previously-used socket, we haven't just done EHLO, so
2022we skip this. */
2023
2024if (continue_hostname == NULL
a7538db1 2025#ifdef SUPPORT_TLS
817d9f57 2026 || tls_out.active >= 0
a7538db1 2027#endif
0756eb3c
PH
2028 )
2029 {
d093f8e5 2030 if (sx->esmtp || sx->lmtp)
2d14f397 2031 {
e9166683 2032 sx->peer_offered = ehlo_response(sx->buffer,
d093f8e5
JH
2033 0 /* no TLS */
2034 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? PEER_OFFERED_IGNQ : 0)
2035 | PEER_OFFERED_CHUNKING
2036 | PEER_OFFERED_PRDR
9094b84b 2037#ifdef SUPPORT_I18N
d093f8e5
JH
2038 | (sx->addrlist->prop.utf8_msg ? PEER_OFFERED_UTF8 : 0)
2039 /*XXX if we hand peercaps on to continued-conn processes,
2040 must not depend on this addr */
9094b84b 2041#endif
d093f8e5
JH
2042 | PEER_OFFERED_DSN
2043 | PEER_OFFERED_PIPE
2044 | (sx->ob->size_addition >= 0 ? PEER_OFFERED_SIZE : 0)
9094b84b
JH
2045 );
2046
2d14f397
JH
2047 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2048 lmtp_ignore_quota option was set. */
f1513293 2049
d093f8e5 2050 sx->igquotstr = sx->peer_offered & PEER_OFFERED_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 2051
2d14f397
JH
2052 /* If the response to EHLO specified support for the SIZE parameter, note
2053 this, provided size_addition is non-negative. */
f1513293 2054
d093f8e5 2055 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_SIZE;
0756eb3c 2056
2d14f397
JH
2057 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2058 the current host, esmtp will be false, so PIPELINING can never be used. If
2059 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 2060
d093f8e5
JH
2061 if ( sx->peer_offered & PEER_OFFERED_PIPE
2062 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
2d14f397 2063 smtp_peer_options |= PEER_OFFERED_PIPE;
0756eb3c 2064
2d14f397
JH
2065 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
2066 smtp_peer_options & PEER_OFFERED_PIPE ? "" : "not ");
0756eb3c 2067
d093f8e5
JH
2068 if ( sx->peer_offered & PEER_OFFERED_CHUNKING
2069 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
2070 sx->peer_offered &= ~PEER_OFFERED_CHUNKING;
f98442df 2071
d093f8e5 2072 if (sx->peer_offered & PEER_OFFERED_CHUNKING)
2d14f397 2073 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
0756eb3c 2074
8ccd00b1 2075#ifndef DISABLE_PRDR
d093f8e5
JH
2076 if ( sx->peer_offered & PEER_OFFERED_PRDR
2077 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
2078 sx->peer_offered &= ~PEER_OFFERED_PRDR;
fd98a5c6 2079
d093f8e5 2080 if (sx->peer_offered & PEER_OFFERED_PRDR)
2d14f397 2081 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
fd98a5c6
JH
2082#endif
2083
2d14f397 2084 /* Note if the server supports DSN */
d093f8e5 2085 smtp_peer_options |= sx->peer_offered & PEER_OFFERED_DSN;
2d14f397 2086 DEBUG(D_transport) debug_printf("%susing DSN\n",
d093f8e5 2087 sx->peer_offered & PEER_OFFERED_DSN ? "" : "not ");
6c1c3d1d 2088
2d14f397
JH
2089 /* Note if the response to EHLO specifies support for the AUTH extension.
2090 If it has, check that this host is one we want to authenticate to, and do
2091 the business. The host name and address must be available when the
2092 authenticator's client driver is running. */
0756eb3c 2093
d093f8e5
JH
2094 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2095 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2d14f397
JH
2096 {
2097 default: goto SEND_QUIT;
2098 case OK: break;
2099 case FAIL_SEND: goto SEND_FAILED;
2100 case FAIL: goto RESPONSE_FAILED;
2101 }
0756eb3c
PH
2102 }
2103 }
2d14f397 2104pipelining_active = !!(smtp_peer_options & PEER_OFFERED_PIPE);
0756eb3c
PH
2105
2106/* The setting up of the SMTP call is now complete. Any subsequent errors are
2107message-specific. */
2108
d093f8e5 2109sx->setting_up = FALSE;
0756eb3c 2110
8c5d388a 2111#ifdef SUPPORT_I18N
d093f8e5 2112if (sx->addrlist->prop.utf8_msg)
9094b84b 2113 {
d093f8e5
JH
2114 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2115 && !sx->addrlist->prop.utf8_downcvt_maybe;
2116 DEBUG(D_transport) if (!sx->utf8_needed)
59a286ef 2117 debug_printf("utf8: %s downconvert\n",
d093f8e5 2118 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
9094b84b
JH
2119 }
2120
7ade712c 2121/* If this is an international message we need the host to speak SMTPUTF8 */
d093f8e5 2122if (sx->utf8_needed && !(sx->peer_offered & PEER_OFFERED_UTF8))
7ade712c
JH
2123 {
2124 errno = ERRNO_UTF8_FWD;
2125 goto RESPONSE_FAILED;
2126 }
2127#endif
2128
d093f8e5
JH
2129return OK;
2130
2131
2132 {
2133 int code;
d093f8e5
JH
2134
2135 RESPONSE_FAILED:
d093f8e5 2136 message = NULL;
de6273b4 2137 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
d093f8e5
JH
2138 sx->buffer, &code, &message, &pass_message);
2139 goto FAILED;
d093f8e5
JH
2140
2141 SEND_FAILED:
d093f8e5
JH
2142 code = '4';
2143 message = US string_sprintf("send() to %s [%s] failed: %s",
829dd842 2144 sx->host->name, sx->host->address, strerror(errno));
d093f8e5
JH
2145 sx->send_quit = FALSE;
2146 goto FAILED;
d093f8e5
JH
2147
2148 /* This label is jumped to directly when a TLS negotiation has failed,
2149 or was not done for a host for which it is required. Values will be set
829dd842 2150 in message and errno, and setting_up will always be true. Treat as
d093f8e5
JH
2151 a temporary error. */
2152
de6273b4
JH
2153 EHLOHELO_FAILED:
2154 code = '4';
2155 message = string_sprintf("Remote host closed connection in response to %s"
2156 " (EHLO response was: %s)", smtp_command, sx->buffer);
2157 sx->send_quit = FALSE;
2158 goto FAILED;
2159
d093f8e5
JH
2160#ifdef SUPPORT_TLS
2161 TLS_FAILED:
de6273b4
JH
2162 code = '4';
2163 goto FAILED;
d093f8e5
JH
2164#endif
2165
2166 /* The failure happened while setting up the call; see if the failure was
2167 a 5xx response (this will either be on connection, or following HELO - a 5xx
2168 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2169 never going to accept them. For other errors during setting up (timeouts or
2170 whatever), defer all addresses, and yield DEFER, so that the host is not
2171 tried again for a while. */
2172
de6273b4 2173FAILED:
d093f8e5 2174 sx->ok = FALSE; /* For when reached by GOTO */
d093f8e5
JH
2175
2176 yield = code == '5'
2177#ifdef SUPPORT_I18N
2178 || errno == ERRNO_UTF8_FWD
2179#endif
2180 ? FAIL : DEFER;
2181
829dd842 2182 set_errno(sx->addrlist, errno, message, yield, pass_message, sx->host
d093f8e5
JH
2183#ifdef EXPERIMENTAL_DSN_INFO
2184 , sx->smtp_greeting, sx->helo_response
2185#endif
2186 );
2187 }
2188
2189
2190SEND_QUIT:
2191
2192if (sx->send_quit)
2193 (void)smtp_write_command(&sx->outblock, FALSE, "QUIT\r\n");
2194
d093f8e5
JH
2195#ifdef SUPPORT_TLS
2196tls_close(FALSE, TRUE);
2197#endif
2198
2199/* Close the socket, and return the appropriate value, first setting
2200works because the NULL setting is passed back to the calling process, and
2201remote_max_parallel is forced to 1 when delivering over an existing connection,
2202
2203If all went well and continue_more is set, we shouldn't actually get here if
2204there are further addresses, as the return above will be taken. However,
2205writing RSET might have failed, or there may be other addresses whose hosts are
2206specified in the transports, and therefore not visible at top level, in which
2207case continue_more won't get set. */
2208
e1d04f48 2209HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
d093f8e5
JH
2210if (sx->send_quit)
2211 {
2212 shutdown(sx->outblock.sock, SHUT_WR);
2213 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2214 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2215 rc--; /* drain socket */
02b41d71 2216 sx->send_quit = FALSE;
d093f8e5
JH
2217 }
2218(void)close(sx->inblock.sock);
02b41d71 2219sx->inblock.sock = sx->outblock.sock = -1;
d093f8e5
JH
2220
2221#ifndef DISABLE_EVENT
2222(void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2223#endif
2224
2225continue_transport = NULL;
2226continue_hostname = NULL;
2227return yield;
2228}
2229
2230
9be4572b
JH
2231
2232
2233/* Create the string of options that will be appended to the MAIL FROM:
2234in the connection context buffer */
2235
2236static int
2237build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2238{
2239uschar * p = sx->buffer;
2240address_item * addr;
2241int address_count;
2242
2243*p = 0;
2244
2245/* If we know the receiving MTA supports the SIZE qualification,
2246send it, adding something to the message size to allow for imprecision
2247and things that get added en route. Exim keeps the number of lines
2248in a message, so we can give an accurate value for the original message, but we
2249need some additional to handle added headers. (Double "." characters don't get
2250included in the count.) */
2251
2252if (sx->peer_offered & PEER_OFFERED_SIZE)
2253 {
2254 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2255 while (*p) p++;
2256 }
2257
2258#ifndef DISABLE_PRDR
2259/* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2260request that */
2261
2262sx->prdr_active = FALSE;
2263if (sx->peer_offered & PEER_OFFERED_PRDR)
2264 for (addr = addrlist; addr; addr = addr->next)
2265 if (addr->transport_return == PENDING_DEFER)
2266 {
2267 for (addr = addr->next; addr; addr = addr->next)
2268 if (addr->transport_return == PENDING_DEFER)
2269 { /* at least two recipients to send */
2270 sx->prdr_active = TRUE;
2271 sprintf(CS p, " PRDR"); p += 5;
2272 break;
2273 }
2274 break;
2275 }
2276#endif
2277
2278#ifdef SUPPORT_I18N
2279/* If it supports internationalised messages, and this meesage need that,
2280request it */
2281
2282if ( sx->peer_offered & PEER_OFFERED_UTF8
2283 && addrlist->prop.utf8_msg
2284 && !addrlist->prop.utf8_downcvt
2285 )
2286 Ustrcpy(p, " SMTPUTF8"), p += 9;
2287#endif
2288
2289/* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2290for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2291 addr && address_count < sx->max_rcpt;
2292 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2293 {
2294 address_count++;
2295 if (!(addr->dsn_flags & rf_dsnlasthop))
2296 {
2297 sx->dsn_all_lasthop = FALSE;
2298 break;
2299 }
2300 }
2301
2302/* Add any DSN flags to the mail command */
2303
2304if (sx->peer_offered & PEER_OFFERED_DSN && !sx->dsn_all_lasthop)
2305 {
2306 if (dsn_ret == dsn_ret_hdrs)
2307 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2308 else if (dsn_ret == dsn_ret_full)
2309 { Ustrcpy(p, " RET=FULL"); p += 9; }
2310
2311 if (dsn_envid)
2312 {
2313 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2314 while (*p) p++;
2315 }
2316 }
2317
2318/* If an authenticated_sender override has been specified for this transport
2319instance, expand it. If the expansion is forced to fail, and there was already
2320an authenticated_sender for this message, the original value will be used.
2321Other expansion failures are serious. An empty result is ignored, but there is
2322otherwise no check - this feature is expected to be used with LMTP and other
2323cases where non-standard addresses (e.g. without domains) might be required. */
2324
2325if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2326 return ERROR;
2327
2328return OK;
2329}
2330
2331
2332static void
2333build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2334{
2335uschar * p = sx->buffer;
2336*p = 0;
2337
2338/* Add any DSN flags to the rcpt command */
2339
2340if (sx->peer_offered & PEER_OFFERED_DSN && !(addr->dsn_flags & rf_dsnlasthop))
2341 {
2342 if (addr->dsn_flags & rf_dsnflags)
2343 {
2344 int i;
2345 BOOL first = TRUE;
2346
2347 Ustrcpy(p, " NOTIFY=");
2348 while (*p) p++;
2349 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2350 {
2351 if (!first) *p++ = ',';
2352 first = FALSE;
2353 Ustrcpy(p, rf_names[i]);
2354 while (*p) p++;
2355 }
2356 }
2357
2358 if (addr->dsn_orcpt)
2359 {
2360 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2361 addr->dsn_orcpt);
2362 while (*p) p++;
2363 }
2364 }
2365}
2366
2367
d9c3c8ed
JH
2368
2369/*
2370Return:
e9166683
JH
2371 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2372 -1 MAIL response error
2373 -2 any non-MAIL read i/o error
2374 -3 non-MAIL response timeout
2375 -4 internal error; channel still usable
2376 -5 transmit failed
d9c3c8ed
JH
2377 */
2378
2379int
2380smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2381{
2382address_item * addr;
2383int address_count;
2384int rc;
2385
2386if (build_mailcmd_options(sx, sx->first_addr) != OK)
2387 {
2388 *yield = ERROR;
e9166683 2389 return -4;
d9c3c8ed
JH
2390 }
2391
2392/* From here until we send the DATA command, we can make use of PIPELINING
2393if the server host supports it. The code has to be able to check the responses
2394at any point, for when the buffer fills up, so we write it totally generally.
2395When PIPELINING is off, each command written reports that it has flushed the
2396buffer. */
2397
2398sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2399
2400 {
2401 uschar * s = sx->from_addr;
2402#ifdef SUPPORT_I18N
2403 uschar * errstr = NULL;
2404
2405 /* If we must downconvert, do the from-address here. Remember we had to
2406 for the to-addresses (done below), and also (ugly) for re-doing when building
2407 the delivery log line. */
2408
2409 if ( sx->addrlist->prop.utf8_msg
2410 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & PEER_OFFERED_UTF8))
2411 )
2412 {
2413 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2414 {
2415 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2416 *yield = ERROR;
e9166683 2417 return -4;
d9c3c8ed
JH
2418 }
2419 setflag(sx->addrlist, af_utf8_downcvt);
2420 }
2421#endif
2422
2423 rc = smtp_write_command(&sx->outblock, pipelining_active,
2424 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2425 }
2426
2427mail_command = string_copy(big_buffer); /* Save for later error message */
2428
2429switch(rc)
2430 {
2431 case -1: /* Transmission error */
e9166683 2432 return -5;
d9c3c8ed 2433
df5b41e3 2434 case +1: /* Cmd was sent */
d9c3c8ed
JH
2435 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2436 sx->ob->command_timeout))
2437 {
2438 if (errno == 0 && sx->buffer[0] == '4')
2439 {
2440 errno = ERRNO_MAIL4XX;
2441 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2442 }
2443 return -1;
2444 }
2445 sx->pending_MAIL = FALSE;
2446 break;
e9166683
JH
2447
2448 /* otherwise zero: command queued for pipeline */
d9c3c8ed
JH
2449 }
2450
2451/* Pass over all the relevant recipient addresses for this host, which are the
2452ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2453several before we have to read the responses for those seen so far. This
2454checking is done by a subroutine because it also needs to be done at the end.
2455Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2456the next one if not all are sent.
2457
2458In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2459last address because we want to abort if any recipients have any kind of
2460problem, temporary or permanent. We know that all recipient addresses will have
2461the PENDING_DEFER status, because only one attempt is ever made, and we know
e9166683
JH
2462that max_rcpt will be large, so all addresses will be done at once.
2463
2464For verify we flush the pipeline after any (the only) rcpt address. */
d9c3c8ed
JH
2465
2466for (addr = sx->first_addr, address_count = 0;
2467 addr && address_count < sx->max_rcpt;
2468 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2469 {
2470 int count;
2471 BOOL no_flush;
2472 uschar * rcpt_addr;
2473
2474 addr->dsn_aware = sx->peer_offered & PEER_OFFERED_DSN
2475 ? dsn_support_yes : dsn_support_no;
2476
2477 address_count++;
e9166683 2478 no_flush = pipelining_active && !sx->verify && (!mua_wrapper || addr->next);
d9c3c8ed
JH
2479
2480 build_rcptcmd_options(sx, addr);
2481
2482 /* Now send the RCPT command, and process outstanding responses when
2483 necessary. After a timeout on RCPT, we just end the function, leaving the
2484 yield as OK, because this error can often mean that there is a problem with
2485 just one address, so we don't want to delay the host. */
2486
2487 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2488
2489#ifdef SUPPORT_I18N
2490 if ( testflag(sx->addrlist, af_utf8_downcvt)
2491 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2492 )
2493 {
2494 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2495 errno = ERRNO_EXPANDFAIL;
e9166683 2496 return -5; /*XXX too harsh? */
d9c3c8ed
JH
2497 }
2498#endif
2499
2500 count = smtp_write_command(&sx->outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
2501 rcpt_addr, sx->igquotstr, sx->buffer);
2502
e9166683 2503 if (count < 0) return -5;
d9c3c8ed
JH
2504 if (count > 0)
2505 {
df5b41e3 2506 switch(sync_responses(sx, count, 0))
d9c3c8ed
JH
2507 {
2508 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2509 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
e9166683 2510 break;
d9c3c8ed
JH
2511
2512 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2513 if (!sx->lmtp) /* can't tell about progress yet */
2514 sx->completed_addr = TRUE;
2515 case 0: /* No 2xx or 5xx, but no probs */
2516 break;
2517
e9166683
JH
2518 case -1: return -3; /* Timeout on RCPT */
2519 case -2: return -2; /* non-MAIL read i/o error */
2520 default: return -1; /* any MAIL error */
d9c3c8ed
JH
2521 }
2522 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2523 }
2524 } /* Loop for next address */
2525
2526sx->next_addr = addr;
2527return 0;
2528}
2529
2530
875512a3
JH
2531#ifdef SUPPORT_TLS
2532/*****************************************************
2533* Proxy TLS connection for another transport process *
2534******************************************************/
2535/*
57cc2785
JH
2536Use the given buffer as a staging area, and select on both the given fd
2537and the TLS'd client-fd for data to read (per the coding in ip_recv() and
875512a3
JH
2538fd_ready() this is legitimate). Do blocking full-size writes, and reads
2539under a timeout.
2540
2541Arguments:
57cc2785
JH
2542 buf space to use for buffering
2543 bufsiz size of buffer
875512a3
JH
2544 proxy_fd comms to proxied process
2545 timeout per-read timeout, seconds
2546*/
2547
57cc2785
JH
2548void
2549smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
875512a3
JH
2550{
2551fd_set fds;
2552int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2553int rc, i, fd_bits, nbytes;
2554
2555set_process_info("proxying TLS connection for continued transport");
2556FD_ZERO(&fds);
2557FD_SET(tls_out.active, &fds);
2558FD_SET(proxy_fd, &fds);
2559
2560for (fd_bits = 3; fd_bits; )
2561 {
2562 time_t time_left = timeout;
2563 time_t time_start = time(NULL);
2564
2565 /* wait for data */
2566 do
2567 {
2568 struct timeval tv = { time_left, 0 };
2569
2570 rc = select(max_fd, (SELECT_ARG2_TYPE *)&fds, NULL, NULL, &tv);
2571
2572 if (rc < 0 && errno == EINTR)
2573 if ((time_left -= time(NULL) - time_start) > 0) continue;
2574
2575 if (rc <= 0)
2576 {
2577 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2578 return;
2579 }
2580 }
2581 while (rc < 0 || !(FD_ISSET(tls_out.active, &fds) || FD_ISSET(proxy_fd, &fds)));
2582
2583 /* handle inbound data */
2584 if (FD_ISSET(tls_out.active, &fds))
57cc2785 2585 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
875512a3
JH
2586 {
2587 fd_bits &= ~1;
2588 FD_CLR(tls_out.active, &fds);
2589 shutdown(proxy_fd, SHUT_WR);
2590 }
2591 else
2592 {
2593 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
57cc2785 2594 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
875512a3
JH
2595 }
2596 else if (fd_bits & 1)
2597 FD_SET(tls_out.active, &fds);
2598
2599 /* handle outbound data */
2600 if (FD_ISSET(proxy_fd, &fds))
57cc2785 2601 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
875512a3
JH
2602 {
2603 fd_bits &= ~2;
2604 FD_CLR(proxy_fd, &fds);
2605 shutdown(tls_out.active, SHUT_WR);
2606 }
2607 else
2608 {
2609 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
57cc2785 2610 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes)) < 0) return;
875512a3
JH
2611 }
2612 else if (fd_bits & 2)
2613 FD_SET(proxy_fd, &fds);
2614 }
2615}
2616#endif
2617
2618
d093f8e5
JH
2619/*************************************************
2620* Deliver address list to given host *
2621*************************************************/
2622
2623/* If continue_hostname is not null, we get here only when continuing to
2624deliver down an existing channel. The channel was passed as the standard
2625input. TLS is never active on a passed channel; the previous process always
2626closes it down before passing the connection on.
2627
2628Otherwise, we have to make a connection to the remote host, and do the
2629initial protocol exchange.
2630
2631When running as an MUA wrapper, if the sender or any recipient is rejected,
2632temporarily or permanently, we force failure for all recipients.
2633
2634Arguments:
2635 addrlist chain of potential addresses to deliver; only those whose
2636 transport_return field is set to PENDING_DEFER are currently
2637 being processed; others should be skipped - they have either
2638 been delivered to an earlier host or IP address, or been
2639 failed by one of them.
2640 host host to deliver to
2641 host_af AF_INET or AF_INET6
2642 port default TCP/IP port to use, in host byte order
2643 interface interface to bind to, or NULL
2644 tblock transport instance block
2645 message_defer set TRUE if yield is OK, but all addresses were deferred
2646 because of a non-recipient, non-host failure, that is, a
2647 4xx response to MAIL FROM, DATA, or ".". This is a defer
2648 that is specific to the message.
2649 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2650 a second attempt after TLS initialization fails
2651
2652Returns: OK - the connection was made and the delivery attempted;
2653 the result for each address is in its data block.
2654 DEFER - the connection could not be made, or something failed
2655 while setting up the SMTP session, or there was a
2656 non-message-specific error, such as a timeout.
2657 ERROR - a filter command is specified for this transport,
2658 and there was a problem setting it up; OR helo_data
2659 or add_headers or authenticated_sender is specified
2660 for this transport, and the string failed to expand
2661*/
2662
2663static int
2664smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
2665 uschar *interface, transport_instance *tblock,
2666 BOOL *message_defer, BOOL suppress_tls)
2667{
2668address_item *addr;
d093f8e5 2669int yield = OK;
d093f8e5
JH
2670int save_errno;
2671int rc;
2672time_t start_delivery_time = time(NULL);
2673
d093f8e5
JH
2674BOOL pass_message = FALSE;
2675uschar *message = NULL;
2676uschar new_message_id[MESSAGE_ID_LENGTH + 1];
2677uschar *p;
2678
2679smtp_context sx;
2680
2681suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
02b41d71 2682*message_defer = FALSE;
d093f8e5
JH
2683
2684sx.addrlist = addrlist;
2685sx.host = host;
2686sx.host_af = host_af,
2687sx.port = port;
2688sx.interface = interface;
02b41d71 2689sx.helo_data = NULL;
d093f8e5 2690sx.tblock = tblock;
e9166683 2691sx.verify = FALSE;
d093f8e5 2692
9be4572b
JH
2693/* Get the channel set up ready for a message (MAIL FROM being the next
2694SMTP command to send */
2695
e9166683 2696if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
d093f8e5
JH
2697 return rc;
2698
0756eb3c
PH
2699/* If there is a filter command specified for this transport, we can now
2700set it up. This cannot be done until the identify of the host is known. */
2701
e9166683 2702if (tblock->filter_command)
0756eb3c 2703 {
9b989985 2704 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
2705
2706 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2707 yield ERROR. */
2708
36d295f1
JH
2709 if (!transport_set_up_command(&transport_filter_argv,
2710 tblock->filter_command, TRUE, DEFER, addrlist,
2711 string_sprintf("%.50s transport", tblock->name), NULL))
0756eb3c 2712 {
895fbaf2
JH
2713 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2714 FALSE);
0756eb3c
PH
2715 yield = ERROR;
2716 goto SEND_QUIT;
2717 }
48f1c853
JH
2718
2719 if ( transport_filter_argv
2720 && *transport_filter_argv
2721 && **transport_filter_argv
d093f8e5 2722 && sx.peer_offered & PEER_OFFERED_CHUNKING
48f1c853
JH
2723 )
2724 {
d093f8e5 2725 sx.peer_offered &= ~PEER_OFFERED_CHUNKING;
48f1c853
JH
2726 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2727 }
0756eb3c
PH
2728 }
2729
36d295f1 2730sx.first_addr = addrlist;
0756eb3c
PH
2731
2732/* For messages that have more than the maximum number of envelope recipients,
2733we want to send several transactions down the same SMTP connection. (See
2734comments in deliver.c as to how this reconciles, heuristically, with
2735remote_max_parallel.) This optimization was added to Exim after the following
2736code was already working. The simplest way to put it in without disturbing the
2737code was to use a goto to jump back to this point when there is another
2738transaction to handle. */
2739
2740SEND_MESSAGE:
d9c3c8ed 2741sx.from_addr = return_path;
36d295f1 2742sx.sync_addr = sx.first_addr;
d093f8e5
JH
2743sx.ok = FALSE;
2744sx.send_rset = TRUE;
d9c3c8ed 2745sx.completed_addr = FALSE;
0756eb3c
PH
2746
2747
57cc2785
JH
2748/* If we are a continued-connection-after-verify the MAIL and RCPT
2749commands were already sent; do not re-send but do mark the addrs as
2750having been accepted up to RCPT stage. A traditional cont-conn
2751always has a sequence number greater than one. */
6b62e899 2752
57cc2785 2753if (continue_hostname && continue_sequence == 1)
0756eb3c 2754 {
57cc2785 2755 address_item * addr;
0756eb3c 2756
57cc2785 2757 sx.peer_offered = smtp_peer_options;
d8b8dd15 2758 sx.pending_MAIL = FALSE;
57cc2785
JH
2759 sx.ok = TRUE;
2760 sx.next_addr = NULL;
0756eb3c 2761
57cc2785
JH
2762 for (addr = addrlist; addr; addr = addr->next)
2763 addr->transport_return = PENDING_OK;
2764 }
2765else
0756eb3c 2766 {
57cc2785
JH
2767 /* Initiate a message transfer. */
2768
2769 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2770 {
2771 case 0: break;
2772 case -1: case -2: goto RESPONSE_FAILED;
2773 case -3: goto END_OFF;
2774 case -4: goto SEND_QUIT;
2775 default: goto SEND_FAILED;
2776 }
2777
2778 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2779 permanently or temporarily. We should have flushed and synced after the last
2780 RCPT. */
2781
2782 if (mua_wrapper)
2783 {
2784 address_item *badaddr;
2785 for (badaddr = sx.first_addr; badaddr; badaddr = badaddr->next)
2786 if (badaddr->transport_return != PENDING_OK)
2787 {
2788 /*XXX could we find a better errno than 0 here? */
2789 set_errno_nohost(addrlist, 0, badaddr->message, FAIL,
2790 testflag(badaddr, af_pass_message));
2791 sx.ok = FALSE;
2792 break;
2793 }
2794 }
0756eb3c
PH
2795 }
2796
2797/* If ok is TRUE, we know we have got at least one good recipient, and must now
2798send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2799have a good recipient buffered up if we are pipelining. We don't want to waste
2800time sending DATA needlessly, so we only send it if either ok is TRUE or if we
6d5c916c
JH
2801are pipelining. The responses are all handled by sync_responses().
2802If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2803to send is. */
0756eb3c 2804
d093f8e5
JH
2805if ( !(sx.peer_offered & PEER_OFFERED_CHUNKING)
2806 && (sx.ok || (pipelining_active && !mua_wrapper)))
0756eb3c 2807 {
d093f8e5 2808 int count = smtp_write_command(&sx.outblock, FALSE, "DATA\r\n");
6d5c916c 2809
0756eb3c 2810 if (count < 0) goto SEND_FAILED;
df5b41e3 2811 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
0756eb3c 2812 {
d093f8e5 2813 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
d9c3c8ed 2814 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
0756eb3c
PH
2815 break;
2816
d093f8e5 2817 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
d9c3c8ed 2818 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
0756eb3c
PH
2819 case 0: break; /* No 2xx or 5xx, but no probs */
2820
2821 case -1: goto END_OFF; /* Timeout on RCPT */
2822 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2823 }
0d9fa8c0 2824 pipelining_active = FALSE;
87cb4a16 2825 data_command = string_copy(big_buffer); /* Save for later error message */
0756eb3c
PH
2826 }
2827
0756eb3c
PH
2828/* If there were no good recipients (but otherwise there have been no
2829problems), just set ok TRUE, since we have handled address-specific errors
2830already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2831for handling the SMTP dot-handling protocol, flagging to apply to headers as
2832well as body. Set the appropriate timeout value to be used for each chunk.
2833(Haven't been able to make it work using select() for writing yet.) */
2834
d093f8e5 2835if (!(sx.peer_offered & PEER_OFFERED_CHUNKING) && !sx.ok)
6d5c916c
JH
2836 {
2837 /* Save the first address of the next batch. */
d9c3c8ed 2838 sx.first_addr = sx.next_addr;
6d5c916c 2839
d093f8e5 2840 sx.ok = TRUE;
6d5c916c 2841 }
ff5aac2b 2842else
0756eb3c 2843 {
6b46ecc6
JH
2844 transport_ctx tctx = {
2845 tblock,
2846 addrlist,
2847 US".", US"..", /* Escaping strings */
65de12cc 2848 topt_use_crlf | topt_escape_headers
6b46ecc6
JH
2849 | (tblock->body_only ? topt_no_headers : 0)
2850 | (tblock->headers_only ? topt_no_body : 0)
2851 | (tblock->return_path_add ? topt_add_return_path : 0)
2852 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2853 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2854 };
2855
6d5c916c
JH
2856 /* If using CHUNKING we need a callback from the generic transport
2857 support to us, for the sending of BDAT smtp commands and the reaping
2858 of responses. The callback needs a whole bunch of state so set up
2859 a transport-context structure to be passed around. */
2860
d093f8e5 2861 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
59932f7d 2862 {
65de12cc 2863 tctx.check_string = tctx.escape_string = NULL;
6d5c916c
JH
2864 tctx.options |= topt_use_bdat;
2865 tctx.chunk_cb = smtp_chunk_cmd_callback;
e9166683
JH
2866 sx.pending_BDAT = FALSE;
2867 sx.good_RCPT = sx.ok;
2868 sx.cmd_count = 0;
2869 tctx.smtp_context = &sx;
59932f7d
JH
2870 }
2871 else
65de12cc 2872 tctx.options |= topt_end_dot;
59932f7d 2873
6d5c916c 2874 /* Save the first address of the next batch. */
d9c3c8ed 2875 sx.first_addr = sx.next_addr;
6d5c916c 2876
e027f545
JH
2877 /* Responses from CHUNKING commands go in buffer. Otherwise,
2878 there has not been a response. */
2879
d093f8e5 2880 sx.buffer[0] = 0;
e027f545 2881
0756eb3c 2882 sigalrm_seen = FALSE;
d093f8e5 2883 transport_write_timeout = sx.ob->data_timeout;
0756eb3c
PH
2884 smtp_command = US"sending data block"; /* For error messages */
2885 DEBUG(D_transport|D_v)
d093f8e5 2886 if (sx.peer_offered & PEER_OFFERED_CHUNKING)
6d5c916c
JH
2887 debug_printf(" will write message using CHUNKING\n");
2888 else
2889 debug_printf(" SMTP>> writing message and terminating \".\"\n");
0756eb3c 2890 transport_count = 0;
a7538db1 2891
80a47a2c 2892#ifndef DISABLE_DKIM
b9df1829
JH
2893 sx.ok = dkim_transport_write_message(sx.inblock.sock, &tctx, &sx.ob->dkim,
2894 CUSS &message);
4cd12fe9 2895#else
d093f8e5 2896 sx.ok = transport_write_message(sx.inblock.sock, &tctx, 0);
4cd12fe9 2897#endif
0756eb3c
PH
2898
2899 /* transport_write_message() uses write() because it is called from other
2900 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2901 it can exit with "Broken pipe" as its error. This really means that the
2902 socket got closed at the far end. */
2903
2904 transport_write_timeout = 0; /* for subsequent transports */
2905
2906 /* Failure can either be some kind of I/O disaster (including timeout),
e027f545
JH
2907 or the failure of a transport filter or the expansion of added headers.
2908 Or, when CHUNKING, it can be a protocol-detected failure. */
0756eb3c 2909
d093f8e5 2910 if (!sx.ok)
b9df1829
JH
2911 if (message) goto SEND_FAILED;
2912 else goto RESPONSE_FAILED;
0756eb3c
PH
2913
2914 /* We used to send the terminating "." explicitly here, but because of
2915 buffering effects at both ends of TCP/IP connections, you don't gain
2916 anything by keeping it separate, so it might as well go in the final
2917 data buffer for efficiency. This is now done by setting the topt_end_dot
2918 flag above. */
2919
2920 smtp_command = US"end of data";
2921
e9166683 2922 if (sx.peer_offered & PEER_OFFERED_CHUNKING && sx.cmd_count > 1)
6d5c916c
JH
2923 {
2924 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
e9166683 2925 switch(sync_responses(&sx, sx.cmd_count-1, 0))
6d5c916c 2926 {
d093f8e5 2927 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
d9c3c8ed 2928 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
6d5c916c
JH
2929 break;
2930
d093f8e5 2931 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
d9c3c8ed 2932 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
6d5c916c
JH
2933 case 0: break; /* No 2xx or 5xx, but no probs */
2934
2935 case -1: goto END_OFF; /* Timeout on RCPT */
2936 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2937 }
2938 }
2939
8ccd00b1 2940#ifndef DISABLE_PRDR
fd98a5c6
JH
2941 /* For PRDR we optionally get a partial-responses warning
2942 * followed by the individual responses, before going on with
2943 * the overall response. If we don't get the warning then deal
2944 * with per non-PRDR. */
d093f8e5 2945 if(sx.prdr_active)
fd98a5c6 2946 {
d093f8e5
JH
2947 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2948 sx.ob->final_timeout);
2949 if (!sx.ok && errno == 0) switch(sx.buffer[0])
e027f545 2950 {
d093f8e5
JH
2951 case '2': sx.prdr_active = FALSE;
2952 sx.ok = TRUE;
e027f545
JH
2953 break;
2954 case '4': errno = ERRNO_DATA4XX;
2955 addrlist->more_errno |=
d093f8e5 2956 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
e027f545
JH
2957 break;
2958 }
fd98a5c6
JH
2959 }
2960 else
2961#endif
2962
2963 /* For non-PRDR SMTP, we now read a single response that applies to the
2964 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2965
d093f8e5 2966 if (!sx.lmtp)
e97957bc 2967 {
d093f8e5
JH
2968 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
2969 sx.ob->final_timeout);
2970 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
e97957bc
PH
2971 {
2972 errno = ERRNO_DATA4XX;
d093f8e5 2973 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
e97957bc
PH
2974 }
2975 }
0756eb3c
PH
2976
2977 /* For LMTP, we get back a response for every RCPT command that we sent;
2978 some may be accepted and some rejected. For those that get a response, their
2979 status is fixed; any that are accepted have been handed over, even if later
2980 responses crash - at least, that's how I read RFC 2033.
2981
2982 If all went well, mark the recipient addresses as completed, record which
2983 host/IPaddress they were delivered to, and cut out RSET when sending another
2984 message down the same channel. Write the completed addresses to the journal
2985 now so that they are recorded in case there is a crash of hardware or
2986 software before the spool gets updated. Also record the final SMTP
2987 confirmation if needed (for SMTP only). */
2988
d093f8e5 2989 if (sx.ok)
0756eb3c
PH
2990 {
2991 int flag = '=';
2992 int delivery_time = (int)(time(NULL) - start_delivery_time);
2993 int len;
0756eb3c 2994 uschar *conf = NULL;
0d9fa8c0 2995
d093f8e5 2996 sx.send_rset = FALSE;
0d9fa8c0 2997 pipelining_active = FALSE;
0756eb3c 2998
0756eb3c
PH
2999 /* Set up confirmation if needed - applies only to SMTP */
3000
d68218c7 3001 if (
0cbf2b82 3002#ifdef DISABLE_EVENT
6c6d6e48 3003 LOGGING(smtp_confirmation) &&
a7538db1 3004#endif
d093f8e5 3005 !sx.lmtp
d68218c7 3006 )
0756eb3c 3007 {
d093f8e5 3008 const uschar *s = string_printing(sx.buffer);
55414b25 3009 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
d093f8e5 3010 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
3011 }
3012
fd98a5c6 3013 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
3014 each one. */
3015
d9c3c8ed 3016 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
0756eb3c
PH
3017 {
3018 if (addr->transport_return != PENDING_OK) continue;
3019
3020 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3021 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
3022 address. For temporary errors, add a retry item for the address so that
3023 it doesn't get tried again too soon. */
0756eb3c 3024
8ccd00b1 3025#ifndef DISABLE_PRDR
d093f8e5 3026 if (sx.lmtp || sx.prdr_active)
fd98a5c6 3027#else
d093f8e5 3028 if (sx.lmtp)
fd98a5c6 3029#endif
0756eb3c 3030 {
d093f8e5
JH
3031 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3032 sx.ob->final_timeout))
0756eb3c 3033 {
d093f8e5 3034 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 3035 addr->message = string_sprintf(
8ccd00b1 3036#ifndef DISABLE_PRDR
d093f8e5 3037 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
fd98a5c6
JH
3038#else
3039 "LMTP error after %s: %s",
3040#endif
d093f8e5 3041 data_command, string_printing(sx.buffer));
75def545 3042 setflag(addr, af_pass_message); /* Allow message to go to user */
d093f8e5 3043 if (sx.buffer[0] == '5')
75def545
PH
3044 addr->transport_return = FAIL;
3045 else
3046 {
e97957bc 3047 errno = ERRNO_DATA4XX;
d093f8e5 3048 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
75def545 3049 addr->transport_return = DEFER;
8ccd00b1 3050#ifndef DISABLE_PRDR
d093f8e5 3051 if (!sx.prdr_active)
fd98a5c6
JH
3052#endif
3053 retry_add_item(addr, addr->address_retry_key, 0);
75def545 3054 }
0756eb3c
PH
3055 continue;
3056 }
d9c3c8ed 3057 sx.completed_addr = TRUE; /* NOW we can set this flag */
6c6d6e48 3058 if (LOGGING(smtp_confirmation))
c0ea85ab 3059 {
d093f8e5 3060 const uschar *s = string_printing(sx.buffer);
55414b25 3061 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
d093f8e5 3062 conf = (s == sx.buffer) ? US string_copy(s) : US s;
c0ea85ab 3063 }
0756eb3c
PH
3064 }
3065
3066 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 3067 actual host that was used. */
0756eb3c
PH
3068
3069 addr->transport_return = OK;
3070 addr->more_errno = delivery_time;
d427a7f9 3071 addr->host_used = host;
0756eb3c
PH
3072 addr->special_action = flag;
3073 addr->message = conf;
8ccd00b1 3074#ifndef DISABLE_PRDR
d093f8e5 3075 if (sx.prdr_active) addr->flags |= af_prdr_used;
fd98a5c6 3076#endif
d093f8e5 3077 if (sx.peer_offered & PEER_OFFERED_CHUNKING) addr->flags |= af_chunking_used;
0756eb3c
PH
3078 flag = '-';
3079
8ccd00b1 3080#ifndef DISABLE_PRDR
d093f8e5 3081 if (!sx.prdr_active)
fd98a5c6
JH
3082#endif
3083 {
3084 /* Update the journal. For homonymic addresses, use the base address plus
3085 the transport name. See lots of comments in deliver.c about the reasons
3086 for the complications when homonyms are involved. Just carry on after
3087 write error, as it may prove possible to update the spool file later. */
4d8d62b9 3088
fd98a5c6 3089 if (testflag(addr, af_homonym))
d093f8e5 3090 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
fd98a5c6 3091 else
d093f8e5 3092 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
4d8d62b9 3093
57cc2785 3094 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
d093f8e5
JH
3095 len = Ustrlen(CS sx.buffer);
3096 if (write(journal_fd, sx.buffer, len) != len)
fd98a5c6 3097 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
d093f8e5 3098 "%s: %s", sx.buffer, strerror(errno));
fd98a5c6 3099 }
0756eb3c
PH
3100 }
3101
8ccd00b1 3102#ifndef DISABLE_PRDR
d093f8e5 3103 if (sx.prdr_active)
fd98a5c6
JH
3104 {
3105 /* PRDR - get the final, overall response. For any non-success
3106 upgrade all the address statuses. */
d093f8e5
JH
3107 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3108 sx.ob->final_timeout);
3109 if (!sx.ok)
fd98a5c6 3110 {
d093f8e5 3111 if(errno == 0 && sx.buffer[0] == '4')
fd98a5c6
JH
3112 {
3113 errno = ERRNO_DATA4XX;
d093f8e5 3114 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
fd98a5c6 3115 }
d9c3c8ed 3116 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
d093f8e5 3117 if (sx.buffer[0] == '5' || addr->transport_return == OK)
fd98a5c6
JH
3118 addr->transport_return = PENDING_OK; /* allow set_errno action */
3119 goto RESPONSE_FAILED;
3120 }
3121
3122 /* Update the journal, or setup retry. */
d9c3c8ed 3123 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
fd98a5c6 3124 if (addr->transport_return == OK)
9be4572b
JH
3125 {
3126 if (testflag(addr, af_homonym))
3127 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3128 else
3129 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3130
3131 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3132 len = Ustrlen(CS sx.buffer);
3133 if (write(journal_fd, sx.buffer, len) != len)
3134 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3135 "%s: %s", sx.buffer, strerror(errno));
3136 }
3137 else if (addr->transport_return == DEFER)
3138 retry_add_item(addr, addr->address_retry_key, -2);
fd98a5c6
JH
3139 }
3140#endif
3141
0756eb3c
PH
3142 /* Ensure the journal file is pushed out to disk. */
3143
54fc8428 3144 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
3145 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
3146 strerror(errno));
3147 }
3148 }
3149
3150
3151/* Handle general (not specific to one address) failures here. The value of ok
3152is used to skip over this code on the falling through case. A timeout causes a
3153deferral. Other errors may defer or fail according to the response code, and
3154may set up a special errno value, e.g. after connection chopped, which is
3155assumed if errno == 0 and there is no text in the buffer. If control reaches
3156here during the setting up phase (i.e. before MAIL FROM) then always defer, as
3157the problem is not related to this specific message. */
3158
d093f8e5 3159if (!sx.ok)
0756eb3c 3160 {
895fbaf2
JH
3161 int code, set_rc;
3162 uschar * set_message;
0756eb3c
PH
3163
3164 RESPONSE_FAILED:
895fbaf2
JH
3165 {
3166 save_errno = errno;
3167 message = NULL;
d093f8e5
JH
3168 sx.send_quit = check_response(host, &save_errno, addrlist->more_errno,
3169 sx.buffer, &code, &message, &pass_message);
895fbaf2
JH
3170 goto FAILED;
3171 }
0756eb3c
PH
3172
3173 SEND_FAILED:
895fbaf2
JH
3174 {
3175 save_errno = errno;
3176 code = '4';
b9df1829 3177 message = string_sprintf("send() to %s [%s] failed: %s",
c0ad8edf 3178 host->name, host->address, message ? message : US strerror(save_errno));
d093f8e5 3179 sx.send_quit = FALSE;
895fbaf2
JH
3180 goto FAILED;
3181 }
0756eb3c 3182
0756eb3c 3183 FAILED:
9be4572b
JH
3184 {
3185 BOOL message_error;
0756eb3c 3186
9be4572b
JH
3187 sx.ok = FALSE; /* For when reached by GOTO */
3188 set_message = message;
0756eb3c 3189
e97957bc 3190 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 3191 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
3192 the contents of the message rather than a real error on the connection. These
3193 cases are treated in the same way as a 4xx response. This next bit of code
3194 does the classification. */
0756eb3c 3195
e97957bc
PH
3196 switch(save_errno)
3197 {
3198 case 0:
3199 case ERRNO_MAIL4XX:
3200 case ERRNO_DATA4XX:
250b6871
JH
3201 message_error = TRUE;
3202 break;
0756eb3c 3203
e97957bc 3204 case ETIMEDOUT:
250b6871
JH
3205 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
3206 Ustrncmp(smtp_command,"end ",4) == 0;
3207 break;
e97957bc
PH
3208
3209 case ERRNO_SMTPCLOSED:
250b6871
JH
3210 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
3211 break;
e97957bc
PH
3212
3213 default:
250b6871
JH
3214 message_error = FALSE;
3215 break;
e97957bc 3216 }
0756eb3c 3217
e97957bc 3218 /* Handle the cases that are treated as message errors. These are:
0756eb3c 3219
e97957bc
PH
3220 (a) negative response or timeout after MAIL
3221 (b) negative response after DATA
3222 (c) negative response or timeout or dropped connection after "."
250b6871 3223 (d) utf8 support required and not offered
0756eb3c 3224
e97957bc
PH
3225 It won't be a negative response or timeout after RCPT, as that is dealt
3226 with separately above. The action in all cases is to set an appropriate
3227 error code for all the addresses, but to leave yield set to OK because the
3228 host itself has not failed. Of course, it might in practice have failed
3229 when we've had a timeout, but if so, we'll discover that at the next
3230 delivery attempt. For a temporary error, set the message_defer flag, and
3231 write to the logs for information if this is not the last host. The error
3232 for the last host will be logged as part of the address's log line. */
3233
3234 if (message_error)
0756eb3c 3235 {
e97957bc 3236 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
e97957bc
PH
3237
3238 /* If there's an errno, the message contains just the identity of
3239 the host. */
3240
895fbaf2
JH
3241 if (code == '5')
3242 set_rc = FAIL;