DANE: move to mainline
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
f9ba5e22 5/* Copyright (c) University of Cambridge 1995 - 2018 */
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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) },
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46 { "dkim_hash", opt_stringptr,
47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_hash) },
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48 { "dkim_identity", opt_stringptr,
49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_identity) },
f7572e5a 50 { "dkim_private_key", opt_stringptr,
ff5aac2b 51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
f7572e5a 52 { "dkim_selector", opt_stringptr,
ff5aac2b 53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
f7572e5a 54 { "dkim_sign_headers", opt_stringptr,
ff5aac2b 55 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
f7572e5a 56 { "dkim_strict", opt_stringptr,
ff5aac2b 57 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
80a47a2c 58#endif
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59 { "dns_qualify_single", opt_bool,
60 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
61 { "dns_search_parents", opt_bool,
62 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
578897ea 63 { "dnssec_request_domains", opt_stringptr,
7cd171b7 64 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 65 { "dnssec_require_domains", opt_stringptr,
7cd171b7 66 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
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67 { "dscp", opt_stringptr,
68 (void *)offsetof(smtp_transport_options_block, dscp) },
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69 { "fallback_hosts", opt_stringptr,
70 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
71 { "final_timeout", opt_time,
72 (void *)offsetof(smtp_transport_options_block, final_timeout) },
73 { "gethostbyname", opt_bool,
74 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
75 { "helo_data", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, helo_data) },
77 { "hosts", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts) },
79 { "hosts_avoid_esmtp", opt_stringptr,
80 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
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81 { "hosts_avoid_pipelining", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 83#ifdef SUPPORT_TLS
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84 { "hosts_avoid_tls", opt_stringptr,
85 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 86#endif
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87 { "hosts_max_try", opt_int,
88 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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89 { "hosts_max_try_hardlimit", opt_int,
90 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 91#ifdef SUPPORT_TLS
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92 { "hosts_nopass_tls", opt_stringptr,
93 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
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94 { "hosts_noproxy_tls", opt_stringptr,
95 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
80a47a2c 96#endif
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97 { "hosts_override", opt_bool,
98 (void *)offsetof(smtp_transport_options_block, hosts_override) },
99 { "hosts_randomize", opt_bool,
100 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 101#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
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102 { "hosts_request_ocsp", opt_stringptr,
103 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
104#endif
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105 { "hosts_require_auth", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 107#ifdef SUPPORT_TLS
c0635b6d 108# ifdef SUPPORT_DANE
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109 { "hosts_require_dane", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
111# endif
f2de3a33 112# ifndef DISABLE_OCSP
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113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115# endif
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116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 118#endif
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119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
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121 { "hosts_try_chunking", opt_stringptr,
122 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
c0635b6d 123#if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
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124 { "hosts_try_dane", opt_stringptr,
125 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
126#endif
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127 { "hosts_try_fastopen", opt_stringptr,
128 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
8ccd00b1 129#ifndef DISABLE_PRDR
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130 { "hosts_try_prdr", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
132#endif
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133#ifdef SUPPORT_TLS
134 { "hosts_verify_avoid_tls", opt_stringptr,
135 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
136#endif
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137 { "interface", opt_stringptr,
138 (void *)offsetof(smtp_transport_options_block, interface) },
139 { "keepalive", opt_bool,
140 (void *)offsetof(smtp_transport_options_block, keepalive) },
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141 { "lmtp_ignore_quota", opt_bool,
142 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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143 { "max_rcpt", opt_int | opt_public,
144 (void *)offsetof(transport_instance, max_addresses) },
506900af 145 { "multi_domain", opt_expand_bool | opt_public,
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146 (void *)offsetof(transport_instance, multi_domain) },
147 { "port", opt_stringptr,
148 (void *)offsetof(smtp_transport_options_block, port) },
149 { "protocol", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 151 { "retry_include_ip_address", opt_expand_bool,
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152 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
153 { "serialize_hosts", opt_stringptr,
154 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
155 { "size_addition", opt_int,
156 (void *)offsetof(smtp_transport_options_block, size_addition) }
f0989ec0 157#ifdef SUPPORT_SOCKS
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158 ,{ "socks_proxy", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
160#endif
80a47a2c 161#ifdef SUPPORT_TLS
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162 ,{ "tls_certificate", opt_stringptr,
163 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
164 { "tls_crl", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_crl) },
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166 { "tls_dh_min_bits", opt_int,
167 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
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168 { "tls_privatekey", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 170 { "tls_require_ciphers", opt_stringptr,
0756eb3c 171 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
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172 { "tls_sni", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_sni) },
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174 { "tls_tempfail_tryclear", opt_bool,
175 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
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176 { "tls_try_verify_hosts", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
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178 { "tls_verify_cert_hostnames", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 180 { "tls_verify_certificates", opt_stringptr,
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181 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
182 { "tls_verify_hosts", opt_stringptr,
183 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 184#endif
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185};
186
187/* Size of the options list. An extern variable has to be used so that its
188address can appear in the tables drtables.c. */
189
190int smtp_transport_options_count =
191 sizeof(smtp_transport_options)/sizeof(optionlist);
192
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193
194#ifdef MACRO_PREDEF
195
196/* Dummy values */
197smtp_transport_options_block smtp_transport_option_defaults = {0};
198void smtp_transport_init(transport_instance *tblock) {}
199BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
200void smtp_transport_closedown(transport_instance *tblock) {}
201
202#else /*!MACRO_PREDEF*/
203
204
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205/* Default private options block for the smtp transport. */
206
207smtp_transport_options_block smtp_transport_option_defaults = {
838d897c 208 .hosts = NULL,
847cd15f 209 .fallback_hosts = NULL,
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210 .hostlist = NULL,
211 .fallback_hostlist = NULL,
212 .authenticated_sender = NULL,
213 .helo_data = US"$primary_hostname",
214 .interface = NULL,
215 .port = NULL,
216 .protocol = US"smtp",
217 .dscp = NULL,
218 .serialize_hosts = NULL,
219 .hosts_try_auth = NULL,
220 .hosts_require_auth = NULL,
221 .hosts_try_chunking = US"*",
c0635b6d 222#ifdef SUPPORT_DANE
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223 .hosts_try_dane = NULL,
224 .hosts_require_dane = NULL,
96e47838 225#endif
838d897c 226 .hosts_try_fastopen = NULL,
8ccd00b1 227#ifndef DISABLE_PRDR
838d897c 228 .hosts_try_prdr = US"*",
fd98a5c6 229#endif
f2de3a33 230#ifndef DISABLE_OCSP
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231 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
232 .hosts_require_ocsp = NULL,
f5d78688 233#endif
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234 .hosts_require_tls = NULL,
235 .hosts_avoid_tls = NULL,
236 .hosts_verify_avoid_tls = NULL,
237 .hosts_avoid_pipelining = NULL,
238 .hosts_avoid_esmtp = NULL,
57cc2785 239#ifdef SUPPORT_TLS
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240 .hosts_nopass_tls = NULL,
241 .hosts_noproxy_tls = US"*",
57cc2785 242#endif
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243 .command_timeout = 5*60,
244 .connect_timeout = 5*60,
245 .data_timeout = 5*60,
246 .final_timeout = 10*60,
247 .size_addition = 1024,
248 .hosts_max_try = 5,
249 .hosts_max_try_hardlimit = 50,
250 .address_retry_include_sender = TRUE,
251 .allow_localhost = FALSE,
252 .authenticated_sender_force = FALSE,
253 .gethostbyname = FALSE,
254 .dns_qualify_single = TRUE,
255 .dns_search_parents = FALSE,
256 .dnssec = { .request=NULL, .require=NULL },
257 .delay_after_cutoff = TRUE,
258 .hosts_override = FALSE,
259 .hosts_randomize = FALSE,
260 .keepalive = TRUE,
261 .lmtp_ignore_quota = FALSE,
262 .expand_retry_include_ip_address = NULL,
263 .retry_include_ip_address = TRUE,
f0989ec0 264#ifdef SUPPORT_SOCKS
838d897c 265 .socks_proxy = NULL,
b8bf753b 266#endif
80a47a2c 267#ifdef SUPPORT_TLS
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268 .tls_certificate = NULL,
269 .tls_crl = NULL,
270 .tls_privatekey = NULL,
271 .tls_require_ciphers = NULL,
272 .tls_sni = NULL,
273 .tls_verify_certificates = US"system",
274 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
275 .tls_tempfail_tryclear = TRUE,
276 .tls_verify_hosts = NULL,
277 .tls_try_verify_hosts = US"*",
278 .tls_verify_cert_hostnames = US"*",
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279#endif
280#ifndef DISABLE_DKIM
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281 .dkim =
282 {.dkim_domain = NULL,
7c6ec81b 283 .dkim_identity = NULL,
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284 .dkim_private_key = NULL,
285 .dkim_selector = NULL,
286 .dkim_canon = NULL,
7c6ec81b 287 .dkim_sign_headers = NULL,
838d897c 288 .dkim_strict = NULL,
d73e45df 289 .dkim_hash = US"sha256",
838d897c 290 .dot_stuffed = FALSE},
80a47a2c 291#endif
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292};
293
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294/* some DSN flags for use later */
295
296static int rf_list[] = {rf_notify_never, rf_notify_success,
297 rf_notify_failure, rf_notify_delay };
298
45500060 299static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
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300
301
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302
303/* Local statics */
304
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305static uschar *smtp_command; /* Points to last cmd for error messages */
306static uschar *mail_command; /* Points to MAIL cmd for error messages */
307static uschar *data_command = US""; /* Points to DATA cmd for error messages */
308static BOOL update_waiting; /* TRUE to update the "wait" database */
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309
310/*XXX move to smtp_context */
87cb4a16 311static BOOL pipelining_active; /* current transaction is in pipe mode */
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312
313
314/*************************************************
315* Setup entry point *
316*************************************************/
317
318/* This function is called when the transport is about to be used,
319but before running it in a sub-process. It is used for two things:
320
321 (1) To set the fallback host list in addresses, when delivering.
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322 (2) To pass back the interface, port, protocol, and other options, for use
323 during callout verification.
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324
325Arguments:
326 tblock pointer to the transport instance block
327 addrlist list of addresses about to be transported
328 tf if not NULL, pointer to block in which to return options
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329 uid the uid that will be set (not used)
330 gid the gid that will be set (not used)
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331 errmsg place for error message (not used)
332
333Returns: OK always (FAIL, DEFER not used)
334*/
335
336static int
337smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 338 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
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339{
340smtp_transport_options_block *ob =
341 (smtp_transport_options_block *)(tblock->options_block);
342
343errmsg = errmsg; /* Keep picky compilers happy */
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344uid = uid;
345gid = gid;
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346
347/* Pass back options if required. This interface is getting very messy. */
348
02b41d71 349if (tf)
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350 {
351 tf->interface = ob->interface;
352 tf->port = ob->port;
353 tf->protocol = ob->protocol;
354 tf->hosts = ob->hosts;
355 tf->hosts_override = ob->hosts_override;
356 tf->hosts_randomize = ob->hosts_randomize;
357 tf->gethostbyname = ob->gethostbyname;
358 tf->qualify_single = ob->dns_qualify_single;
359 tf->search_parents = ob->dns_search_parents;
26da7e20 360 tf->helo_data = ob->helo_data;
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361 }
362
363/* Set the fallback host list for all the addresses that don't have fallback
364host lists, provided that the local host wasn't present in the original host
365list. */
366
367if (!testflag(addrlist, af_local_host_removed))
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368 for (; addrlist; addrlist = addrlist->next)
369 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
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370
371return OK;
372}
373
374
375
376/*************************************************
377* Initialization entry point *
378*************************************************/
379
380/* Called for each instance, after its options have been read, to
381enable consistency checks to be done, or anything else that needs
382to be set up.
383
384Argument: pointer to the transport instance block
385Returns: nothing
386*/
387
388void
389smtp_transport_init(transport_instance *tblock)
390{
391smtp_transport_options_block *ob =
392 (smtp_transport_options_block *)(tblock->options_block);
393
394/* Retry_use_local_part defaults FALSE if unset */
395
396if (tblock->retry_use_local_part == TRUE_UNSET)
397 tblock->retry_use_local_part = FALSE;
398
399/* Set the default port according to the protocol */
400
401if (ob->port == NULL)
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402 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
403 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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404
405/* Set up the setup entry point, to be called before subprocesses for this
406transport. */
407
408tblock->setup = smtp_transport_setup;
409
410/* Complain if any of the timeouts are zero. */
411
412if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
413 ob->final_timeout <= 0)
414 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
415 "command, data, or final timeout value is zero for %s transport",
416 tblock->name);
417
418/* If hosts_override is set and there are local hosts, set the global
419flag that stops verify from showing router hosts. */
420
421if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
422
423/* If there are any fallback hosts listed, build a chain of host items
424for them, but do not do any lookups at this time. */
425
426host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
427}
428
429
430
431
432
433/*************************************************
434* Set delivery info into all active addresses *
435*************************************************/
436
437/* Only addresses whose status is >= PENDING are relevant. A lesser
438status means that an address is not currently being processed.
439
440Arguments:
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441 addrlist points to a chain of addresses
442 errno_value to put in each address's errno field
443 msg to put in each address's message field
444 rc to put in each address's transport_return field
445 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 446 host if set, mark addrs as having used this host
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447 smtp_greeting from peer
448 helo_response from peer
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449
450If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
451the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
452this particular type of timeout.
453
454Returns: nothing
455*/
456
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457static void
458set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
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459 BOOL pass_message, host_item * host
460#ifdef EXPERIMENTAL_DSN_INFO
461 , const uschar * smtp_greeting, const uschar * helo_response
462#endif
463 )
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464{
465address_item *addr;
466int orvalue = 0;
467if (errno_value == ERRNO_CONNECTTIMEOUT)
468 {
469 errno_value = ETIMEDOUT;
470 orvalue = RTEF_CTOUT;
471 }
895fbaf2 472for (addr = addrlist; addr; addr = addr->next)
168dec3b 473 if (addr->transport_return >= PENDING)
447d236c 474 {
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475 addr->basic_errno = errno_value;
476 addr->more_errno |= orvalue;
02b41d71 477 if (msg)
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478 {
479 addr->message = msg;
480 if (pass_message) setflag(addr, af_pass_message);
481 }
482 addr->transport_return = rc;
483 if (host)
895fbaf2 484 {
168dec3b 485 addr->host_used = host;
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486#ifdef EXPERIMENTAL_DSN_INFO
487 if (smtp_greeting)
488 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
489 addr->smtp_greeting = smtp_greeting;
490
491 if (helo_response)
492 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
493 addr->helo_response = helo_response;
494#endif
495 }
447d236c 496 }
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497}
498
895fbaf2
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499static void
500set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
501 BOOL pass_message)
502{
503set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
504#ifdef EXPERIMENTAL_DSN_INFO
505 , NULL, NULL
506#endif
507 );
508}
0756eb3c
PH
509
510
511/*************************************************
512* Check an SMTP response *
513*************************************************/
514
515/* This function is given an errno code and the SMTP response buffer
516to analyse, together with the host identification for generating messages. It
517sets an appropriate message and puts the first digit of the response code into
518the yield variable. If no response was actually read, a suitable digit is
519chosen.
520
521Arguments:
447d236c
PH
522 host the current host, to get its name for messages
523 errno_value pointer to the errno value
524 more_errno from the top address for use with ERRNO_FILTER_FAIL
525 buffer the SMTP response buffer
526 yield where to put a one-digit SMTP response code
4c04137d 527 message where to put an error message
447d236c
PH
528 pass_message set TRUE if message is an SMTP response
529
530Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
531*/
532
a7538db1
JH
533static BOOL
534check_response(host_item *host, int *errno_value, int more_errno,
447d236c 535 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c 536{
0d9fa8c0 537uschar * pl = pipelining_active ? US"pipelined " : US"";
e9166683 538const uschar * s;
0756eb3c
PH
539
540*yield = '4'; /* Default setting is to give a temporary error */
541
e9166683 542switch(*errno_value)
0756eb3c 543 {
e9166683
JH
544 case ETIMEDOUT: /* Handle response timeout */
545 *message = US string_sprintf("SMTP timeout after %s%s",
546 pl, smtp_command);
547 if (transport_count > 0)
548 *message = US string_sprintf("%s (%d bytes written)", *message,
549 transport_count);
550 return FALSE;
551
552 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
553 s = string_printing(buffer);
554 while (isspace(*s)) s++;
555 *message = *s == 0
556 ? string_sprintf("Malformed SMTP reply (an empty line) "
557 "in response to %s%s", pl, smtp_command)
558 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
559 pl, smtp_command, s);
560 return FALSE;
561
562 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
563 can't send QUIT as we mustn't end the DATA. */
564 *message = string_sprintf("transport filter process failed (%d)%s",
565 more_errno,
566 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
567 return FALSE;
568
569 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
570 can't send QUIT as we mustn't end the DATA. */
571 *message =
572 string_sprintf("failed to expand headers_add or headers_remove: %s",
573 expand_string_message);
574 return FALSE;
575
576 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
577 *message = string_sprintf("failed to write a data block");
578 return FALSE;
0756eb3c 579
8c5d388a 580#ifdef SUPPORT_I18N
e9166683
JH
581 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
582 *message = US"utf8 support required but not offered for forwarding";
583 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
584 return TRUE;
250b6871 585#endif
e9166683 586 }
250b6871 587
0756eb3c
PH
588/* Handle error responses from the remote mailer. */
589
590if (buffer[0] != 0)
591 {
e9166683
JH
592 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
593 "%s", pl, smtp_command, s = string_printing(buffer));
447d236c 594 *pass_message = TRUE;
0756eb3c
PH
595 *yield = buffer[0];
596 return TRUE;
597 }
598
599/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
600connection closed) case, which causes deferral. An explicit connection reset
601error has the same effect. Otherwise, put the host's identity in the message,
602leaving the errno value to be interpreted as well. In all cases, we have to
603assume the connection is now dead. */
0756eb3c 604
19b9dc85 605if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
606 {
607 *errno_value = ERRNO_SMTPCLOSED;
c562fd30 608 *message = US string_sprintf("Remote host closed connection "
02b41d71 609 "in response to %s%s", pl, smtp_command);
0756eb3c 610 }
de6273b4
JH
611else
612 *message = US string_sprintf("%s [%s]", host->name, host->address);
0756eb3c
PH
613
614return FALSE;
615}
616
617
618
619/*************************************************
620* Write error message to logs *
621*************************************************/
622
623/* This writes to the main log and to the message log.
624
625Arguments:
0756eb3c 626 host the current host
ec62d0a9
HSHR
627 detail the current message (addr_item->message)
628 basic_errno the errno (addr_item->basic_errno)
0756eb3c
PH
629
630Returns: nothing
631*/
632
633static void
ec62d0a9 634write_logs(const host_item *host, const uschar *suffix, int basic_errno)
0756eb3c 635{
ec62d0a9
HSHR
636
637
638uschar *message = LOGGING(outgoing_port)
584ddd64
JH
639 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
640 host->port == PORT_NONE ? 25 : host->port)
641 : string_sprintf("H=%s [%s]", host->name, host->address);
c562fd30 642
ec62d0a9 643if (suffix)
0756eb3c 644 {
ec62d0a9
HSHR
645 message = string_sprintf("%s: %s", message, suffix);
646 if (basic_errno > 0)
647 message = string_sprintf("%s: %s", message, strerror(basic_errno));
0756eb3c
PH
648 }
649else
ec62d0a9
HSHR
650 message = string_sprintf("%s %s", message, exim_errstr(basic_errno));
651
652log_write(0, LOG_MAIN, "%s", message);
653deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
0756eb3c
PH
654}
655
c562fd30
JH
656static void
657msglog_line(host_item * host, uschar * message)
658{
37f3dc43
JH
659deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
660 host->name, host->address, message);
c562fd30
JH
661}
662
0756eb3c
PH
663
664
0cbf2b82 665#ifndef DISABLE_EVENT
d68218c7
JH
666/*************************************************
667* Post-defer action *
668*************************************************/
669
670/* This expands an arbitrary per-transport string.
671 It might, for example, be used to write to the database log.
672
673Arguments:
d68218c7
JH
674 addr the address item containing error information
675 host the current host
676
677Returns: nothing
678*/
679
680static void
774ef2d7 681deferred_event_raise(address_item *addr, host_item *host)
d68218c7 682{
774ef2d7 683uschar * action = addr->transport->event_action;
55414b25 684const uschar * save_domain;
a7538db1
JH
685uschar * save_local;
686
d68218c7 687if (!action)
a7538db1 688 return;
d68218c7 689
a7538db1
JH
690save_domain = deliver_domain;
691save_local = deliver_localpart;
692
693/*XXX would ip & port already be set up? */
694deliver_host_address = string_copy(host->address);
774ef2d7
JH
695deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
696event_defer_errno = addr->basic_errno;
d68218c7
JH
697
698router_name = addr->router->name;
699transport_name = addr->transport->name;
a7538db1
JH
700deliver_domain = addr->domain;
701deliver_localpart = addr->local_part;
702
774ef2d7 703(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
704 addr->message
705 ? addr->basic_errno > 0
706 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
707 : string_copy(addr->message)
708 : addr->basic_errno > 0
709 ? string_copy(US strerror(addr->basic_errno))
710 : NULL);
711
712deliver_localpart = save_local;
713deliver_domain = save_domain;
d68218c7
JH
714router_name = transport_name = NULL;
715}
716#endif
717
0756eb3c
PH
718/*************************************************
719* Synchronize SMTP responses *
720*************************************************/
721
722/* This function is called from smtp_deliver() to receive SMTP responses from
723the server, and match them up with the commands to which they relate. When
724PIPELINING is not in use, this function is called after every command, and is
725therefore somewhat over-engineered, but it is simpler to use a single scheme
726that works both with and without PIPELINING instead of having two separate sets
727of code.
728
729The set of commands that are buffered up with pipelining may start with MAIL
730and may end with DATA; in between are RCPT commands that correspond to the
731addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
732etc.) are never buffered.
733
734Errors after MAIL or DATA abort the whole process leaving the response in the
735buffer. After MAIL, pending responses are flushed, and the original command is
736re-instated in big_buffer for error messages. For RCPT commands, the remote is
737permitted to reject some recipient addresses while accepting others. However
738certain errors clearly abort the whole process. Set the value in
739transport_return to PENDING_OK if the address is accepted. If there is a
740subsequent general error, it will get reset accordingly. If not, it will get
741converted to OK at the end.
742
743Arguments:
df5b41e3 744 sx smtp connection context
48c7f9e2 745 count the number of responses to read
48c7f9e2
PH
746 pending_DATA 0 if last command sent was not DATA
747 +1 if previously had a good recipient
748 -1 if not previously had a good recipient
0756eb3c
PH
749
750Returns: 3 if at least one address had 2xx and one had 5xx
751 2 if at least one address had 5xx but none had 2xx
752 1 if at least one host had a 2xx response, but none had 5xx
753 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
754 -1 timeout while reading RCPT response
755 -2 I/O or other non-response error for RCPT
756 -3 DATA or MAIL failed - errno and buffer set
757*/
758
759static int
df5b41e3 760sync_responses(smtp_context * sx, int count, int pending_DATA)
0756eb3c 761{
df5b41e3 762address_item *addr = sx->sync_addr;
e9166683
JH
763smtp_transport_options_block *ob =
764 (smtp_transport_options_block *)sx->tblock->options_block;
0756eb3c
PH
765int yield = 0;
766
767/* Handle the response for a MAIL command. On error, reinstate the original
768command in big_buffer for error message use, and flush any further pending
769responses before returning, except after I/O errors and timeouts. */
770
df5b41e3 771if (sx->pending_MAIL)
0756eb3c
PH
772 {
773 count--;
e9166683
JH
774 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
775 '2', ob->command_timeout))
0756eb3c 776 {
e027f545 777 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
0756eb3c 778 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
df5b41e3 779 if (errno == 0 && sx->buffer[0] != 0)
0756eb3c
PH
780 {
781 uschar flushbuffer[4096];
e97957bc 782 int save_errno = 0;
df5b41e3 783 if (sx->buffer[0] == '4')
e97957bc
PH
784 {
785 save_errno = ERRNO_MAIL4XX;
df5b41e3 786 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e97957bc 787 }
0756eb3c
PH
788 while (count-- > 0)
789 {
df5b41e3 790 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
e9166683 791 '2', ob->command_timeout)
0756eb3c
PH
792 && (errno != 0 || flushbuffer[0] == 0))
793 break;
794 }
e97957bc 795 errno = save_errno;
0756eb3c 796 }
c562fd30
JH
797
798 if (pending_DATA) count--; /* Number of RCPT responses to come */
799 while (count-- > 0) /* Mark any pending addrs with the host used */
800 {
801 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
df5b41e3 802 addr->host_used = sx->host;
c562fd30
JH
803 addr = addr->next;
804 }
0756eb3c
PH
805 return -3;
806 }
807 }
808
809if (pending_DATA) count--; /* Number of RCPT responses to come */
810
811/* Read and handle the required number of RCPT responses, matching each one up
812with an address by scanning for the next address whose status is PENDING_DEFER.
813*/
814
815while (count-- > 0)
816 {
4c2471ca
JH
817 while (addr->transport_return != PENDING_DEFER)
818 if (!(addr = addr->next))
819 return -2;
0756eb3c
PH
820
821 /* The address was accepted */
df5b41e3 822 addr->host_used = sx->host;
0756eb3c 823
e9166683
JH
824 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
825 '2', ob->command_timeout))
0756eb3c
PH
826 {
827 yield |= 1;
828 addr->transport_return = PENDING_OK;
829
830 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
831 ensure that any address-specific retry record is expunged. We do this both
832 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
833
834 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
835 {
836 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
837 sender_address);
838 retry_add_item(addr, altkey, rf_delete);
0756eb3c 839 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 840 }
0756eb3c
PH
841 }
842
843 /* Timeout while reading the response */
844
845 else if (errno == ETIMEDOUT)
846 {
c562fd30 847 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
e9166683 848 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
df5b41e3 849 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 850 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 851 update_waiting = FALSE;
0756eb3c
PH
852 return -1;
853 }
854
855 /* Handle other errors in obtaining an SMTP response by returning -1. This
856 will cause all the addresses to be deferred. Restore the SMTP command in
857 big_buffer for which we are checking the response, so the error message
858 makes sense. */
859
df5b41e3 860 else if (errno != 0 || sx->buffer[0] == 0)
0756eb3c
PH
861 {
862 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
df5b41e3 863 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
0756eb3c
PH
864 return -2;
865 }
866
867 /* Handle SMTP permanent and temporary response codes. */
868
869 else
870 {
871 addr->message =
447d236c 872 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
df5b41e3
JH
873 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
874 string_printing(sx->buffer));
447d236c 875 setflag(addr, af_pass_message);
e9166683
JH
876 if (!sx->verify)
877 msglog_line(sx->host, addr->message);
0756eb3c
PH
878
879 /* The response was 5xx */
880
df5b41e3 881 if (sx->buffer[0] == '5')
0756eb3c
PH
882 {
883 addr->transport_return = FAIL;
884 yield |= 2;
885 }
886
887 /* The response was 4xx */
888
889 else
890 {
0756eb3c
PH
891 addr->transport_return = DEFER;
892 addr->basic_errno = ERRNO_RCPT4XX;
df5b41e3 893 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
0756eb3c 894
e9166683
JH
895 if (!sx->verify)
896 {
0cbf2b82 897#ifndef DISABLE_EVENT
e9166683
JH
898 event_defer_errno = addr->more_errno;
899 msg_event_raise(US"msg:rcpt:host:defer", addr);
5ef5dd52
JB
900#endif
901
e9166683
JH
902 /* Log temporary errors if there are more hosts to be tried.
903 If not, log this last one in the == line. */
0756eb3c 904
e9166683
JH
905 if (sx->host->next)
906 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
907 sx->host->name, sx->host->address, addr->message);
0756eb3c 908
0cbf2b82 909#ifndef DISABLE_EVENT
e9166683
JH
910 else
911 msg_event_raise(US"msg:rcpt:defer", addr);
5ef5dd52
JB
912#endif
913
e9166683
JH
914 /* Do not put this message on the list of those waiting for specific
915 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 916
e9166683 917 update_waiting = FALSE;
0756eb3c 918
e9166683
JH
919 /* Add a retry item for the address so that it doesn't get tried again
920 too soon. If address_retry_include_sender is true, add the sender address
921 to the retry key. */
0756eb3c 922
e9166683
JH
923 retry_add_item(addr,
924 ob->address_retry_include_sender
925 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
926 : addr->address_retry_key,
927 0);
928 }
0756eb3c
PH
929 }
930 }
931 } /* Loop for next RCPT response */
932
933/* Update where to start at for the next block of responses, unless we
934have already handled all the addresses. */
935
e9166683 936if (addr) sx->sync_addr = addr->next;
0756eb3c
PH
937
938/* Handle a response to DATA. If we have not had any good recipients, either
939previously or in this block, the response is ignored. */
940
941if (pending_DATA != 0 &&
e9166683
JH
942 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
943 '3', ob->command_timeout))
0756eb3c
PH
944 {
945 int code;
946 uschar *msg;
447d236c 947 BOOL pass_message;
e97957bc
PH
948 if (pending_DATA > 0 || (yield & 1) != 0)
949 {
df5b41e3 950 if (errno == 0 && sx->buffer[0] == '4')
e97957bc
PH
951 {
952 errno = ERRNO_DATA4XX;
df5b41e3 953 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e97957bc
PH
954 }
955 return -3;
956 }
df5b41e3 957 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
0756eb3c
PH
958 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
959 "is in use and there were no good recipients\n", msg);
960 }
961
962/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
963present) received 3xx. If any RCPTs were handled and yielded anything other
964than 4xx, yield will be set non-zero. */
965
966return yield;
967}
968
969
970
fcc8e047
JH
971/* Do the client side of smtp-level authentication */
972/*
973Arguments:
974 buffer EHLO response from server (gets overwritten)
975 addrlist chain of potential addresses to deliver
976 host host to deliver to
977 ob transport options
978 ibp, obp comms channel control blocks
979
980Returns:
981 OK Success, or failed (but not required): global "smtp_authenticated" set
982 DEFER Failed authentication (and was required)
983 ERROR Internal problem
984
985 FAIL_SEND Failed communications - transmit
986 FAIL - response
987*/
988
989int
990smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
991 smtp_transport_options_block *ob, BOOL is_esmtp,
992 smtp_inblock *ibp, smtp_outblock *obp)
993{
a7538db1
JH
994int require_auth;
995uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 996
a7538db1
JH
997smtp_authenticated = FALSE;
998client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 999require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 1000
a7538db1
JH
1001if (is_esmtp && !regex_AUTH) regex_AUTH =
1002 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
1003 FALSE, TRUE);
fcc8e047 1004
a7538db1
JH
1005if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1006 {
1007 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1008 expand_nmax = -1; /* reset */
fcc8e047 1009
a7538db1
JH
1010 /* Must not do this check until after we have saved the result of the
1011 regex match above. */
fcc8e047 1012
a7538db1 1013 if (require_auth == OK ||
5130845b 1014 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
1015 {
1016 auth_instance *au;
1017 fail_reason = US"no common mechanisms were found";
fcc8e047 1018
a7538db1 1019 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1020
a7538db1
JH
1021 /* Scan the configured authenticators looking for one which is configured
1022 for use as a client, which is not suppressed by client_condition, and
1023 whose name matches an authentication mechanism supported by the server.
1024 If one is found, attempt to authenticate by calling its client function.
1025 */
fcc8e047 1026
cab0c277 1027 for (au = auths; !smtp_authenticated && au; au = au->next)
a7538db1
JH
1028 {
1029 uschar *p = names;
1030 if (!au->client ||
1031 (au->client_condition != NULL &&
1032 !expand_check_condition(au->client_condition, au->name,
1033 US"client authenticator")))
1034 {
1035 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1036 au->name,
1037 (au->client)? "client_condition is false" :
1038 "not configured as a client");
1039 continue;
1040 }
fcc8e047 1041
a7538db1 1042 /* Loop to scan supported server mechanisms */
fcc8e047 1043
cab0c277 1044 while (*p)
a7538db1
JH
1045 {
1046 int rc;
1047 int len = Ustrlen(au->public_name);
1048 while (isspace(*p)) p++;
fcc8e047 1049
a7538db1
JH
1050 if (strncmpic(au->public_name, p, len) != 0 ||
1051 (p[len] != 0 && !isspace(p[len])))
1052 {
1053 while (*p != 0 && !isspace(*p)) p++;
1054 continue;
1055 }
fcc8e047 1056
a7538db1
JH
1057 /* Found data for a listed mechanism. Call its client entry. Set
1058 a flag in the outblock so that data is overwritten after sending so
1059 that reflections don't show it. */
fcc8e047 1060
a7538db1
JH
1061 fail_reason = US"authentication attempt(s) failed";
1062 obp->authenticating = TRUE;
1063 rc = (au->info->clientcode)(au, ibp, obp,
1064 ob->command_timeout, buffer, bufsize);
1065 obp->authenticating = FALSE;
1066 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1067 au->name, rc);
fcc8e047 1068
a7538db1
JH
1069 /* A temporary authentication failure must hold up delivery to
1070 this host. After a permanent authentication failure, we carry on
1071 to try other authentication methods. If all fail hard, try to
1072 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1073
a7538db1
JH
1074 switch(rc)
1075 {
1076 case OK:
1077 smtp_authenticated = TRUE; /* stops the outer loop */
1078 client_authenticator = au->name;
1079 if (au->set_client_id != NULL)
1080 client_authenticated_id = expand_string(au->set_client_id);
1081 break;
1082
1083 /* Failure after writing a command */
1084
1085 case FAIL_SEND:
1086 return FAIL_SEND;
1087
1088 /* Failure after reading a response */
1089
1090 case FAIL:
1091 if (errno != 0 || buffer[0] != '5') return FAIL;
1092 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1093 au->name, host->name, host->address, buffer);
1094 break;
1095
1096 /* Failure by some other means. In effect, the authenticator
1097 decided it wasn't prepared to handle this case. Typically this
1098 is the result of "fail" in an expansion string. Do we need to
1099 log anything here? Feb 2006: a message is now put in the buffer
1100 if logging is required. */
1101
1102 case CANCELLED:
1103 if (*buffer != 0)
1104 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1105 "authentication H=%s [%s] %s", au->name, host->name,
1106 host->address, buffer);
1107 break;
1108
1109 /* Internal problem, message in buffer. */
1110
1111 case ERROR:
895fbaf2
JH
1112 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1113 DEFER, FALSE);
a7538db1
JH
1114 return ERROR;
1115 }
fcc8e047 1116
a7538db1
JH
1117 break; /* If not authenticated, try next authenticator */
1118 } /* Loop for scanning supported server mechanisms */
1119 } /* Loop for further authenticators */
fcc8e047 1120 }
a7538db1 1121 }
fcc8e047 1122
a7538db1 1123/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1124
a7538db1
JH
1125if (require_auth == OK && !smtp_authenticated)
1126 {
895fbaf2 1127 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1128 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1129 FALSE);
a7538db1
JH
1130 return DEFER;
1131 }
4d8d62b9 1132
a7538db1 1133return OK;
fcc8e047
JH
1134}
1135
1136
1137/* Construct AUTH appendix string for MAIL TO */
1138/*
1139Arguments
1140 buffer to build string
1141 addrlist chain of potential addresses to deliver
1142 ob transport options
1143
1144Globals smtp_authenticated
1145 client_authenticated_sender
1146Return True on error, otherwise buffer has (possibly empty) terminated string
1147*/
1148
1149BOOL
1150smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1151 smtp_transport_options_block *ob)
1152{
1153uschar *local_authenticated_sender = authenticated_sender;
1154
1155#ifdef notdef
1156 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1157#endif
1158
1159if (ob->authenticated_sender != NULL)
1160 {
1161 uschar *new = expand_string(ob->authenticated_sender);
1162 if (new == NULL)
1163 {
1164 if (!expand_string_forcedfail)
1165 {
1166 uschar *message = string_sprintf("failed to expand "
1167 "authenticated_sender: %s", expand_string_message);
895fbaf2 1168 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH
1169 return TRUE;
1170 }
1171 }
1172 else if (new[0] != 0) local_authenticated_sender = new;
1173 }
1174
1175/* Add the authenticated sender address if present */
1176
1177if ((smtp_authenticated || ob->authenticated_sender_force) &&
1178 local_authenticated_sender != NULL)
1179 {
1180 string_format(buffer, bufsize, " AUTH=%s",
1181 auth_xtextencode(local_authenticated_sender,
1182 Ustrlen(local_authenticated_sender)));
1183 client_authenticated_sender = string_copy(local_authenticated_sender);
1184 }
1185else
1186 *buffer= 0;
1187
1188return FALSE;
1189}
1190
1191
1192
c0635b6d 1193#ifdef SUPPORT_DANE
2d5fdd53
JH
1194/* Lookup TLSA record for host/port.
1195Return: OK success with dnssec; DANE mode
1196 DEFER Do not use this host now, may retry later
1197 FAIL_FORCED No TLSA record; DANE not usable
1198 FAIL Do not use this connection
1199*/
1200
0e66b3b6 1201int
4b0fe319 1202tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
0e66b3b6
JH
1203{
1204/* move this out to host.c given the similarity to dns_lookup() ? */
1205uschar buffer[300];
55414b25 1206const uschar * fullname = buffer;
58c30e47
JH
1207int rc;
1208BOOL sec;
0e66b3b6
JH
1209
1210/* TLSA lookup string */
1211(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1212
58c30e47
JH
1213rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1214sec = dns_is_secure(dnsa);
1215DEBUG(D_transport)
1216 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1217
1218switch (rc)
0e66b3b6 1219 {
2d5fdd53
JH
1220 case DNS_AGAIN:
1221 return DEFER; /* just defer this TLS'd conn */
1222
899b8bbc
JH
1223 case DNS_SUCCEED:
1224 if (sec) return OK;
1225 log_write(0, LOG_MAIN,
1226 "DANE error: TLSA lookup for %s not DNSSEC", host->name);
1227 /*FALLTRHOUGH*/
1228
ef3a1a30
JH
1229 case DNS_NODATA: /* no TLSA RR for this lookup */
1230 case DNS_NOMATCH: /* no records at all for this lookup */
6b524204 1231 return dane_required ? FAIL : FAIL_FORCED;
2d5fdd53
JH
1232
1233 default:
1234 case DNS_FAIL:
1235 return dane_required ? FAIL : DEFER;
0e66b3b6 1236 }
0e66b3b6
JH
1237}
1238#endif
1239
1240
a39bd74d
JB
1241
1242typedef struct smtp_compare_s
1243{
1244 uschar *current_sender_address;
1245 struct transport_instance *tblock;
1246} smtp_compare_t;
1247
d093f8e5
JH
1248
1249/* Create a unique string that identifies this message, it is based on
1250sender_address, helo_data and tls_certificate if enabled.
1251*/
a39bd74d
JB
1252
1253static uschar *
1254smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1255{
1256address_item * addr1;
1257uschar * if1 = US"";
1258uschar * helo1 = US"";
1259#ifdef SUPPORT_TLS
1260uschar * tlsc1 = US"";
1261#endif
1262uschar * save_sender_address = sender_address;
1263uschar * local_identity = NULL;
1264smtp_transport_options_block * ob =
1265 (smtp_transport_options_block *)tblock->options_block;
1266
1267sender_address = sender;
1268
1269addr1 = deliver_make_addr (sender, TRUE);
1270deliver_set_expansions(addr1);
1271
1272if (ob->interface)
1273 if1 = expand_string(ob->interface);
1274
1275if (ob->helo_data)
1276 helo1 = expand_string(ob->helo_data);
1277
1278#ifdef SUPPORT_TLS
1279if (ob->tls_certificate)
1280 tlsc1 = expand_string(ob->tls_certificate);
1281local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1282#else
1283local_identity = string_sprintf ("%s^%s", if1, helo1);
1284#endif
1285
1286deliver_set_expansions(NULL);
1287sender_address = save_sender_address;
1288
1289return local_identity;
1290}
1291
1292
1293
1294/* This routine is a callback that is called from transport_check_waiting.
1295This function will evaluate the incoming message versus the previous
1296message. If the incoming message is using a different local identity then
1297we will veto this new message. */
1298
1299static BOOL
1300smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1301{
dadff1d4
HSHR
1302uschar * message_local_identity,
1303 * current_local_identity,
1304 * new_sender_address;
1305
1306current_local_identity =
a39bd74d 1307 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1308
dadff1d4
HSHR
1309if (!(new_sender_address = deliver_get_sender_address(message_id)))
1310 return 0;
1311
1312message_local_identity =
1313 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1314
1315return Ustrcmp(current_local_identity, message_local_identity) == 0;
1316}
1317
1318
1319
e9166683
JH
1320static uschar
1321ehlo_response(uschar * buf, uschar checks)
9094b84b 1322{
e9166683
JH
1323size_t bsize = Ustrlen(buf);
1324
9094b84b 1325#ifdef SUPPORT_TLS
14de8063 1326if ( checks & OPTION_TLS
ff5aac2b 1327 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1328 checks &= ~OPTION_TLS;
9094b84b
JH
1329#endif
1330
14de8063 1331if ( checks & OPTION_IGNQ
ff5aac2b
JH
1332 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1333 PCRE_EOPT, NULL, 0) < 0)
14de8063 1334 checks &= ~OPTION_IGNQ;
9094b84b 1335
14de8063 1336if ( checks & OPTION_CHUNKING
f98442df 1337 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1338 checks &= ~OPTION_CHUNKING;
f98442df 1339
9094b84b 1340#ifndef DISABLE_PRDR
14de8063 1341if ( checks & OPTION_PRDR
ff5aac2b 1342 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1343 checks &= ~OPTION_PRDR;
9094b84b
JH
1344#endif
1345
1346#ifdef SUPPORT_I18N
14de8063 1347if ( checks & OPTION_UTF8
ff5aac2b 1348 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1349 checks &= ~OPTION_UTF8;
9094b84b
JH
1350#endif
1351
14de8063 1352if ( checks & OPTION_DSN
ff5aac2b 1353 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1354 checks &= ~OPTION_DSN;
9094b84b 1355
14de8063 1356if ( checks & OPTION_PIPE
ff5aac2b
JH
1357 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1358 PCRE_EOPT, NULL, 0) < 0)
14de8063 1359 checks &= ~OPTION_PIPE;
9094b84b 1360
14de8063 1361if ( checks & OPTION_SIZE
ff5aac2b 1362 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1363 checks &= ~OPTION_SIZE;
9094b84b
JH
1364
1365return checks;
1366}
1367
1368
6d5c916c
JH
1369
1370/* Callback for emitting a BDAT data chunk header.
6d5c916c 1371
e027f545
JH
1372If given a nonzero size, first flush any buffered SMTP commands
1373then emit the command.
1374
d2aa036b
JH
1375Reap previous SMTP command responses if requested, and always reap
1376the response from a previous BDAT command.
1377
1378Args:
1379 tctx transport context
1380 chunk_size value for SMTP BDAT command
1381 flags
1382 tc_chunk_last add LAST option to SMTP BDAT command
1383 tc_reap_prev reap response to previous SMTP commands
6d5c916c
JH
1384
1385Returns: OK or ERROR
1386*/
1387
1388static int
d2aa036b
JH
1389smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1390 unsigned flags)
6d5c916c
JH
1391{
1392smtp_transport_options_block * ob =
1393 (smtp_transport_options_block *)(tctx->tblock->options_block);
e9166683 1394smtp_context * sx = tctx->smtp_context;
e027f545
JH
1395int cmd_count = 0;
1396int prev_cmd_count;
6d5c916c 1397
4e910c01
JH
1398/* Write SMTP chunk header command. If not reaping responses, note that
1399there may be more writes (like, the chunk data) done soon. */
6d5c916c 1400
e027f545 1401if (chunk_size > 0)
87cb4a16 1402 {
4e910c01
JH
1403 if((cmd_count = smtp_write_command(&sx->outblock,
1404 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1405 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
e027f545 1406 ) < 0) return ERROR;
87cb4a16
JH
1407 if (flags & tc_chunk_last)
1408 data_command = string_copy(big_buffer); /* Save for later error message */
1409 }
e027f545 1410
e9166683 1411prev_cmd_count = cmd_count += sx->cmd_count;
6d5c916c 1412
e027f545 1413/* Reap responses for any previous, but not one we just emitted */
6d5c916c 1414
e027f545
JH
1415if (chunk_size > 0)
1416 prev_cmd_count--;
e9166683 1417if (sx->pending_BDAT)
e027f545 1418 prev_cmd_count--;
6d5c916c 1419
e027f545 1420if (flags & tc_reap_prev && prev_cmd_count > 0)
6d5c916c 1421 {
58fc5fb2
JH
1422 DEBUG(D_transport) debug_printf("look for %d responses"
1423 " for previous pipelined cmds\n", prev_cmd_count);
6d5c916c 1424
e9166683 1425 switch(sync_responses(sx, prev_cmd_count, 0))
e027f545
JH
1426 {
1427 case 1: /* 2xx (only) => OK */
e9166683
JH
1428 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1429 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
e027f545
JH
1430 case 0: break; /* No 2xx or 5xx, but no probs */
1431
1432 case -1: /* Timeout on RCPT */
1433 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1434 }
1435 cmd_count = 1;
e9166683 1436 if (!sx->pending_BDAT)
e027f545 1437 pipelining_active = FALSE;
6d5c916c 1438 }
e027f545 1439
58fc5fb2 1440/* Reap response for an outstanding BDAT */
e027f545 1441
e9166683 1442if (sx->pending_BDAT)
e027f545 1443 {
58fc5fb2
JH
1444 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1445
e9166683 1446 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
e027f545
JH
1447 ob->command_timeout))
1448 {
e9166683 1449 if (errno == 0 && sx->buffer[0] == '4')
e027f545
JH
1450 {
1451 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
36e55f49 1452 sx->addrlist->more_errno |=
e9166683 1453 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e027f545
JH
1454 }
1455 return ERROR;
1456 }
1457 cmd_count--;
e9166683 1458 sx->pending_BDAT = FALSE;
e027f545
JH
1459 pipelining_active = FALSE;
1460 }
1461else if (chunk_size > 0)
e9166683 1462 sx->pending_BDAT = TRUE;
e027f545
JH
1463
1464
e9166683 1465sx->cmd_count = cmd_count;
e027f545 1466return OK;
6d5c916c
JH
1467}
1468
1469
1470
0756eb3c 1471/*************************************************
d093f8e5 1472* Make connection for given message *
0756eb3c
PH
1473*************************************************/
1474
d093f8e5
JH
1475/*
1476Arguments:
1477 ctx connection context
d093f8e5
JH
1478 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1479 a second attempt after TLS initialization fails
d093f8e5
JH
1480
1481Returns: OK - the connection was made and the delivery attempted;
1482 fd is set in the conn context, tls_out set up.
1483 DEFER - the connection could not be made, or something failed
1484 while setting up the SMTP session, or there was a
1485 non-message-specific error, such as a timeout.
1486 ERROR - helo_data or add_headers or authenticated_sender is
1487 specified for this transport, and the string failed
1488 to expand
1489*/
1490int
e9166683 1491smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
d093f8e5 1492{
c0635b6d 1493#if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
d093f8e5
JH
1494dns_answer tlsa_dnsa;
1495#endif
1496BOOL pass_message = FALSE;
d093f8e5 1497uschar * message = NULL;
d093f8e5
JH
1498int yield = OK;
1499int rc;
1500
02b41d71 1501sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
d093f8e5
JH
1502
1503sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1504sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1505sx->ok = FALSE;
1506sx->send_rset = TRUE;
1507sx->send_quit = TRUE;
1508sx->setting_up = TRUE;
1509sx->esmtp = TRUE;
1510sx->esmtp_sent = FALSE;
59a286ef 1511#ifdef SUPPORT_I18N
d093f8e5 1512sx->utf8_needed = FALSE;
59a286ef 1513#endif
d093f8e5 1514sx->dsn_all_lasthop = TRUE;
c0635b6d 1515#if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
d093f8e5
JH
1516sx->dane = FALSE;
1517sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1518#endif
1519
1520if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
d093f8e5 1521sx->peer_offered = 0;
14de8063 1522sx->avoid_option = 0;
d093f8e5 1523sx->igquotstr = US"";
02b41d71 1524if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
d093f8e5
JH
1525#ifdef EXPERIMENTAL_DSN_INFO
1526sx->smtp_greeting = NULL;
1527sx->helo_response = NULL;
59a286ef
JH
1528#endif
1529
0756eb3c 1530smtp_command = US"initial connection";
d093f8e5 1531sx->buffer[0] = '\0';
0756eb3c
PH
1532
1533/* Set up the buffer for reading SMTP response packets. */
1534
d093f8e5
JH
1535sx->inblock.buffer = sx->inbuffer;
1536sx->inblock.buffersize = sizeof(sx->inbuffer);
1537sx->inblock.ptr = sx->inbuffer;
1538sx->inblock.ptrend = sx->inbuffer;
0756eb3c
PH
1539
1540/* Set up the buffer for holding SMTP commands while pipelining */
1541
d093f8e5
JH
1542sx->outblock.buffer = sx->outbuffer;
1543sx->outblock.buffersize = sizeof(sx->outbuffer);
1544sx->outblock.ptr = sx->outbuffer;
1545sx->outblock.cmd_count = 0;
1546sx->outblock.authenticating = FALSE;
0756eb3c 1547
6c512171
PH
1548/* Reset the parameters of a TLS session. */
1549
817d9f57
JH
1550tls_out.bits = 0;
1551tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1552tls_out.ourcert = NULL;
1553tls_out.peercert = NULL;
817d9f57
JH
1554tls_out.peerdn = NULL;
1555#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1556tls_out.sni = NULL;
5b456975 1557#endif
018058b2 1558tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1559
35aba663
JH
1560/* Flip the legacy TLS-related variables over to the outbound set in case
1561they're used in the context of the transport. Don't bother resetting
02b41d71
JH
1562afterward (when being used by a transport) as we're in a subprocess.
1563For verify, unflipped once the callout is dealt with */
35aba663
JH
1564
1565tls_modify_variables(&tls_out);
1566
061b7ebd 1567#ifndef SUPPORT_TLS
d093f8e5 1568if (sx->smtps)
061b7ebd 1569 {
d093f8e5 1570 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
895fbaf2 1571 DEFER, FALSE);
018058b2 1572 return ERROR;
061b7ebd
PP
1573 }
1574#endif
1575
0756eb3c
PH
1576/* Make a connection to the host if this isn't a continued delivery, and handle
1577the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1578specially so they can be identified for retries. */
1579
58c30e47 1580if (!continue_hostname)
0756eb3c 1581 {
e9166683 1582 if (sx->verify)
02b41d71
JH
1583 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1584
58c30e47 1585 /* Get the actual port the connection will use, into sx->host */
4311097e 1586
58c30e47 1587 smtp_port_for_connect(sx->host, sx->port);
0756eb3c 1588
c0635b6d 1589#if defined(SUPPORT_TLS) && defined(SUPPORT_DANE)
58c30e47 1590 /* Do TLSA lookup for DANE */
0e66b3b6 1591 {
0e66b3b6
JH
1592 tls_out.dane_verified = FALSE;
1593 tls_out.tlsa_usage = 0;
1594
d093f8e5 1595 if (sx->host->dnssec == DS_YES)
0e66b3b6 1596 {
d093f8e5
JH
1597 if( sx->dane_required
1598 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
0e66b3b6 1599 )
d093f8e5 1600 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
4b0fe319 1601 {
58c30e47
JH
1602 case OK: sx->dane = TRUE;
1603 sx->ob->tls_tempfail_tryclear = FALSE;
1604 break;
2d5fdd53 1605 case FAIL_FORCED: break;
d093f8e5 1606 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2d5fdd53
JH
1607 string_sprintf("DANE error: tlsa lookup %s",
1608 rc == DEFER ? "DEFER" : "FAIL"),
1609 rc, FALSE);
1610 return rc;
4b0fe319 1611 }
0e66b3b6 1612 }
d093f8e5 1613 else if (sx->dane_required)
0e66b3b6 1614 {
d093f8e5
JH
1615 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1616 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
895fbaf2 1617 FAIL, FALSE);
4b0fe319 1618 return FAIL;
0e66b3b6 1619 }
0e66b3b6
JH
1620 }
1621#endif /*DANE*/
1622
58c30e47
JH
1623 /* Make the TCP connection */
1624
1625 sx->inblock.sock = sx->outblock.sock =
1626 smtp_connect(sx->host, sx->host_af, sx->interface,
1627 sx->ob->connect_timeout, sx->tblock);
1628
1629 if (sx->inblock.sock < 0)
1630 {
1631 uschar * msg = NULL;
1632 if (sx->verify)
1633 {
1634 msg = US strerror(errno);
1635 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1636 }
1637 set_errno_nohost(sx->addrlist,
1638 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1639 sx->verify ? string_sprintf("could not connect: %s", msg)
1640 : NULL,
1641 DEFER, FALSE);
1642 sx->send_quit = FALSE;
1643 return DEFER;
1644 }
1645
41c7c167
PH
1646 /* Expand the greeting message while waiting for the initial response. (Makes
1647 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1648 delayed till here so that $sending_interface and $sending_port are set. */
1649
02b41d71
JH
1650 if (sx->helo_data)
1651 if (!(sx->helo_data = expand_string(sx->helo_data)))
e9166683 1652 if (sx->verify)
02b41d71
JH
1653 log_write(0, LOG_MAIN|LOG_PANIC,
1654 "<%s>: failed to expand transport's helo_data value for callout: %s",
1655 sx->addrlist->address, expand_string_message);
1656
8c5d388a 1657#ifdef SUPPORT_I18N
d093f8e5 1658 if (sx->helo_data)
810d16ad 1659 {
02b41d71
JH
1660 expand_string_message = NULL;
1661 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1662 &expand_string_message)),
1663 expand_string_message)
e9166683 1664 if (sx->verify)
02b41d71
JH
1665 log_write(0, LOG_MAIN|LOG_PANIC,
1666 "<%s>: failed to expand transport's helo_data value for callout: %s",
1667 sx->addrlist->address, expand_string_message);
1668 else
1669 sx->helo_data = NULL;
810d16ad
JH
1670 }
1671#endif
41c7c167 1672
0756eb3c
PH
1673 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1674 is nevertheless a reasonably clean way of programming this kind of logic,
1675 where you want to escape on any error. */
1676
d093f8e5 1677 if (!sx->smtps)
061b7ebd 1678 {
8d330698
JH
1679 BOOL good_response;
1680
1681#ifdef TCP_QUICKACK
d093f8e5 1682 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
8d330698 1683#endif
d093f8e5
JH
1684 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1685 '2', sx->ob->command_timeout);
895fbaf2 1686#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1687 sx->smtp_greeting = string_copy(sx->buffer);
895fbaf2
JH
1688#endif
1689 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1690
0cbf2b82 1691#ifndef DISABLE_EVENT
b30275b8 1692 {
805c9d53 1693 uschar * s;
d093f8e5
JH
1694 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1695 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1696 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
b30275b8 1697 if (s)
a7538db1 1698 {
d093f8e5 1699 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
b30275b8 1700 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1701 DEFER, FALSE);
a7538db1
JH
1702 yield = DEFER;
1703 goto SEND_QUIT;
1704 }
b30275b8 1705 }
a7538db1
JH
1706#endif
1707
061b7ebd
PP
1708 /* Now check if the helo_data expansion went well, and sign off cleanly if
1709 it didn't. */
41c7c167 1710
d093f8e5 1711 if (!sx->helo_data)
061b7ebd 1712 {
d093f8e5 1713 message = string_sprintf("failed to expand helo_data: %s",
061b7ebd 1714 expand_string_message);
d093f8e5 1715 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP
1716 yield = DEFER;
1717 goto SEND_QUIT;
1718 }
41c7c167
PH
1719 }
1720
0756eb3c 1721/** Debugging without sending a message
d093f8e5 1722sx->addrlist->transport_return = DEFER;
0756eb3c
PH
1723goto SEND_QUIT;
1724**/
1725
1726 /* Errors that occur after this point follow an SMTP command, which is
1727 left in big_buffer by smtp_write_command() for use in error messages. */
1728
1729 smtp_command = big_buffer;
1730
1731 /* Tell the remote who we are...
1732
1733 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1734 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1735 greeting is of this form. The assumption was that the far end supports it
1736 properly... but experience shows that there are some that give 5xx responses,
1737 even though the banner includes "ESMTP" (there's a bloody-minded one that
1738 says "ESMTP not spoken here"). Cope with that case.
1739
1740 September 2000: Time has passed, and it seems reasonable now to always send
1741 EHLO at the start. It is also convenient to make the change while installing
1742 the TLS stuff.
1743
1744 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1745 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1746 would be no way to send out the mails, so there is now a host list
1747 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1748 PIPELINING problem as well. Maybe it can also be useful to cure other
1749 problems with broken servers.
1750
1751 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1752 Then somebody tried it with a Microsoft mailer... It seems that all other
1753 mailers use upper case for some reason (the RFC is quite clear about case
1754 independence) so, for peace of mind, I gave in. */
1755
d093f8e5 1756 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
0756eb3c 1757
061b7ebd
PP
1758 /* Alas; be careful, since this goto is not an error-out, so conceivably
1759 we might set data between here and the target which we assume to exist
1760 and be usable. I can see this coming back to bite us. */
a7538db1 1761#ifdef SUPPORT_TLS
d093f8e5 1762 if (sx->smtps)
061b7ebd 1763 {
14de8063 1764 smtp_peer_options |= OPTION_TLS;
061b7ebd 1765 suppress_tls = FALSE;
d093f8e5 1766 sx->ob->tls_tempfail_tryclear = FALSE;
061b7ebd
PP
1767 smtp_command = US"SSL-on-connect";
1768 goto TLS_NEGOTIATE;
1769 }
a7538db1 1770#endif
061b7ebd 1771
d093f8e5 1772 if (sx->esmtp)
0756eb3c 1773 {
4e910c01 1774 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
d093f8e5 1775 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
0756eb3c 1776 goto SEND_FAILED;
d093f8e5
JH
1777 sx->esmtp_sent = TRUE;
1778 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1779 sx->ob->command_timeout))
0756eb3c 1780 {
d093f8e5 1781 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
895fbaf2
JH
1782 {
1783#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1784 sx->helo_response = string_copy(sx->buffer);
895fbaf2
JH
1785#endif
1786 goto RESPONSE_FAILED;
1787 }
d093f8e5 1788 sx->esmtp = FALSE;
0756eb3c 1789 }
895fbaf2 1790#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1791 sx->helo_response = string_copy(sx->buffer);
895fbaf2 1792#endif
0756eb3c
PH
1793 }
1794 else
0756eb3c
PH
1795 DEBUG(D_transport)
1796 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
0756eb3c 1797
d093f8e5 1798 if (!sx->esmtp)
0756eb3c 1799 {
895fbaf2 1800 BOOL good_response;
d093f8e5
JH
1801 int n = sizeof(sx->buffer);
1802 uschar * rsp = sx->buffer;
a57ce043 1803
d093f8e5
JH
1804 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1805 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
895fbaf2 1806
4e910c01 1807 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
0756eb3c 1808 goto SEND_FAILED;
d093f8e5
JH
1809 good_response = smtp_read_response(&sx->inblock, rsp, n,
1810 '2', sx->ob->command_timeout);
895fbaf2 1811#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1812 sx->helo_response = string_copy(rsp);
895fbaf2 1813#endif
a57ce043
JH
1814 if (!good_response)
1815 {
1816 /* Handle special logging for a closed connection after HELO
1817 when had previously sent EHLO */
1818
d093f8e5 1819 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
a57ce043 1820 {
de6273b4
JH
1821 errno = ERRNO_SMTPCLOSED;
1822 goto EHLOHELO_FAILED;
a57ce043 1823 }
e5ab0ba9 1824 memmove(sx->buffer, rsp, Ustrlen(rsp));
a57ce043
JH
1825 goto RESPONSE_FAILED;
1826 }
0756eb3c
PH
1827 }
1828
14de8063 1829 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2d14f397 1830
d093f8e5 1831 if (sx->esmtp || sx->lmtp)
2d14f397 1832 {
e9166683 1833 sx->peer_offered = ehlo_response(sx->buffer,
14de8063 1834 OPTION_TLS /* others checked later */
9094b84b 1835 );
f1513293 1836
0756eb3c
PH
1837 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1838
a7538db1 1839#ifdef SUPPORT_TLS
14de8063 1840 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
7ade712c 1841#endif
2d14f397 1842 }
0756eb3c
PH
1843 }
1844
57cc2785
JH
1845/* For continuing deliveries down the same channel, having re-exec'd the socket
1846is the standard input; for a socket held open from verify it is recorded
1847in the cutthrough context block. Either way we don't need to redo EHLO here
1848(but may need to do so for TLS - see below).
1849Set up the pointer to where subsequent commands will be left, for
2d14f397 1850error messages. Note that smtp_peer_options will have been
0756eb3c
PH
1851set from the command line if they were set in the process that passed the
1852connection on. */
1853
895fbaf2 1854/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
4c04137d 1855as the continue goes via transport_pass_socket() and doublefork and exec.
895fbaf2
JH
1856It does not wait. Unclear how we keep separate host's responses
1857separate - we could match up by host ip+port as a bodge. */
1858
0756eb3c
PH
1859else
1860 {
57cc2785
JH
1861 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1862 {
1863 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1864 sx->host->port = sx->port = cutthrough.host.port;
1865 }
1866 else
1867 {
1868 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
a843a57e 1869 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
57cc2785 1870 }
0756eb3c 1871 smtp_command = big_buffer;
02b41d71 1872 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
875512a3 1873
57cc2785
JH
1874 /* For a continued connection with TLS being proxied for us, or a
1875 held-open verify connection with TLS, nothing more to do. */
875512a3 1876
57cc2785
JH
1877 if ( continue_proxy_cipher
1878 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1879 )
875512a3
JH
1880 {
1881 sx->peer_offered = smtp_peer_options;
14de8063 1882 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
57cc2785
JH
1883 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1884 continue_proxy_cipher ? "proxied" : "verify conn with");
875512a3
JH
1885 return OK;
1886 }
1887 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
0756eb3c
PH
1888 }
1889
1890/* If TLS is available on this connection, whether continued or not, attempt to
1891start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1892send another EHLO - the server may give a different answer in secure mode. We
1893use a separate buffer for reading the response to STARTTLS so that if it is
1894negative, the original EHLO data is available for subsequent analysis, should
1895the client not be required to use TLS. If the response is bad, copy the buffer
1896for error analysis. */
1897
1898#ifdef SUPPORT_TLS
14de8063 1899if ( smtp_peer_options & OPTION_TLS
5130845b 1900 && !suppress_tls
02b41d71 1901 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
e9166683 1902 && ( !sx->verify
02b41d71
JH
1903 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1904 ) )
0756eb3c
PH
1905 {
1906 uschar buffer2[4096];
4e910c01 1907 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
0756eb3c
PH
1908 goto SEND_FAILED;
1909
1910 /* If there is an I/O error, transmission of this message is deferred. If
1911 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1912 false, we also defer. However, if there is a temporary rejection of STARTTLS
1913 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1914 STARTTLS, we carry on. This means we will try to send the message in clear,
1915 unless the host is in hosts_require_tls (tested below). */
1916
d093f8e5
JH
1917 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1918 sx->ob->command_timeout))
0756eb3c 1919 {
4b0fe319
JH
1920 if ( errno != 0
1921 || buffer2[0] == 0
d093f8e5 1922 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
4b0fe319 1923 )
0dda4340 1924 {
d093f8e5 1925 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
9e7e0f6a 1926 sx->buffer[sizeof(sx->buffer)-1] = '\0';
0756eb3c 1927 goto RESPONSE_FAILED;
0dda4340 1928 }
0756eb3c
PH
1929 }
1930
1931 /* STARTTLS accepted: try to negotiate a TLS session. */
1932
1933 else
061b7ebd 1934 TLS_NEGOTIATE:
0756eb3c 1935 {
d093f8e5 1936 address_item * addr;
cf0c6164
JH
1937 uschar * errstr;
1938 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
c0635b6d 1939# ifdef SUPPORT_DANE
cf0c6164 1940 sx->dane ? &tlsa_dnsa : NULL,
0e66b3b6 1941# endif
cf0c6164 1942 &errstr);
0756eb3c
PH
1943
1944 /* TLS negotiation failed; give an error. From outside, this function may
1945 be called again to try in clear on a new connection, if the options permit
1946 it for this host. */
1947
1948 if (rc != OK)
1949 {
c0635b6d 1950# ifdef SUPPORT_DANE
d093f8e5 1951 if (sx->dane) log_write(0, LOG_MAIN,
cf0c6164
JH
1952 "DANE attempt failed; TLS connection to %s [%s]: %s",
1953 sx->host->name, sx->host->address, errstr);
6ebd79ec
JH
1954# endif
1955
de6273b4 1956 errno = ERRNO_TLSFAILURE;
cf0c6164 1957 message = string_sprintf("TLS session: %s", errstr);
d093f8e5 1958 sx->send_quit = FALSE;
0756eb3c
PH
1959 goto TLS_FAILED;
1960 }
1961
1962 /* TLS session is set up */
1963
2d14f397 1964 smtp_peer_options_wrap = smtp_peer_options;
d093f8e5 1965 for (addr = sx->addrlist; addr; addr = addr->next)
5ca2a9a1
PH
1966 if (addr->transport_return == PENDING_DEFER)
1967 {
817d9f57 1968 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1969 addr->ourcert = tls_out.ourcert;
1970 addr->peercert = tls_out.peercert;
817d9f57 1971 addr->peerdn = tls_out.peerdn;
018058b2 1972 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1973 }
0756eb3c
PH
1974 }
1975 }
1976
061b7ebd
PP
1977/* if smtps, we'll have smtp_command set to something else; always safe to
1978reset it here. */
1979smtp_command = big_buffer;
1980
41c7c167
PH
1981/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1982helo_data is null, we are dealing with a connection that was passed from
1983another process, and so we won't have expanded helo_data above. We have to
1984expand it here. $sending_ip_address and $sending_port are set up right at the
1985start of the Exim process (in exim.c). */
0756eb3c 1986
817d9f57 1987if (tls_out.active >= 0)
0756eb3c 1988 {
061b7ebd 1989 char *greeting_cmd;
895fbaf2
JH
1990 BOOL good_response;
1991
d093f8e5 1992 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
41c7c167 1993 {
d093f8e5
JH
1994 uschar *message = string_sprintf("failed to expand helo_data: %s",
1995 expand_string_message);
1996 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1997 yield = DEFER;
1998 goto SEND_QUIT;
41c7c167
PH
1999 }
2000
0d0e4455 2001 /* For SMTPS we need to wait for the initial OK response. */
d093f8e5 2002 if (sx->smtps)
061b7ebd 2003 {
d093f8e5
JH
2004 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2005 '2', sx->ob->command_timeout);
895fbaf2 2006#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 2007 sx->smtp_greeting = string_copy(sx->buffer);
895fbaf2
JH
2008#endif
2009 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP
2010 }
2011
d093f8e5 2012 if (sx->esmtp)
0d0e4455
PP
2013 greeting_cmd = "EHLO";
2014 else
2015 {
2016 greeting_cmd = "HELO";
2017 DEBUG(D_transport)
2018 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
2019 }
2020
4e910c01 2021 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
d093f8e5 2022 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
0756eb3c 2023 goto SEND_FAILED;
d093f8e5
JH
2024 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2025 '2', sx->ob->command_timeout);
895fbaf2 2026#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 2027 sx->helo_response = string_copy(sx->buffer);
895fbaf2
JH
2028#endif
2029 if (!good_response) goto RESPONSE_FAILED;
2d14f397 2030 smtp_peer_options = 0;
0756eb3c
PH
2031 }
2032
2033/* If the host is required to use a secure channel, ensure that we
2034have one. */
2035
d093f8e5 2036else if ( sx->smtps
c0635b6d 2037# ifdef SUPPORT_DANE
d093f8e5 2038 || sx->dane
0e66b3b6 2039# endif
d093f8e5 2040 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
7a31d643 2041 )
0756eb3c 2042 {
de6273b4 2043 errno = ERRNO_TLSREQUIRED;
c562fd30 2044 message = string_sprintf("a TLS session is required, but %s",
14de8063 2045 smtp_peer_options & OPTION_TLS
2d14f397 2046 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
0756eb3c
PH
2047 goto TLS_FAILED;
2048 }
0e66b3b6 2049#endif /*SUPPORT_TLS*/
0756eb3c
PH
2050
2051/* If TLS is active, we have just started it up and re-done the EHLO command,
2052so its response needs to be analyzed. If TLS is not active and this is a
2053continued session down a previously-used socket, we haven't just done EHLO, so
2054we skip this. */
2055
2056if (continue_hostname == NULL
a7538db1 2057#ifdef SUPPORT_TLS
817d9f57 2058 || tls_out.active >= 0
a7538db1 2059#endif
0756eb3c
PH
2060 )
2061 {
d093f8e5 2062 if (sx->esmtp || sx->lmtp)
2d14f397 2063 {
e9166683 2064 sx->peer_offered = ehlo_response(sx->buffer,
d093f8e5 2065 0 /* no TLS */
14de8063
JH
2066 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2067 | OPTION_CHUNKING
2068 | OPTION_PRDR
9094b84b 2069#ifdef SUPPORT_I18N
14de8063 2070 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
d093f8e5
JH
2071 /*XXX if we hand peercaps on to continued-conn processes,
2072 must not depend on this addr */
9094b84b 2073#endif
14de8063
JH
2074 | OPTION_DSN
2075 | OPTION_PIPE
2076 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
9094b84b
JH
2077 );
2078
2d14f397
JH
2079 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2080 lmtp_ignore_quota option was set. */
f1513293 2081
14de8063 2082 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 2083
2d14f397
JH
2084 /* If the response to EHLO specified support for the SIZE parameter, note
2085 this, provided size_addition is non-negative. */
f1513293 2086
14de8063 2087 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
0756eb3c 2088
2d14f397
JH
2089 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2090 the current host, esmtp will be false, so PIPELINING can never be used. If
2091 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 2092
14de8063 2093 if ( sx->peer_offered & OPTION_PIPE
d093f8e5 2094 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
14de8063 2095 smtp_peer_options |= OPTION_PIPE;
0756eb3c 2096
2d14f397 2097 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
14de8063 2098 smtp_peer_options & OPTION_PIPE ? "" : "not ");
0756eb3c 2099
14de8063 2100 if ( sx->peer_offered & OPTION_CHUNKING
d093f8e5 2101 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
14de8063 2102 sx->peer_offered &= ~OPTION_CHUNKING;
f98442df 2103
14de8063 2104 if (sx->peer_offered & OPTION_CHUNKING)
2d14f397 2105 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
0756eb3c 2106
8ccd00b1 2107#ifndef DISABLE_PRDR
14de8063 2108 if ( sx->peer_offered & OPTION_PRDR
d093f8e5 2109 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
14de8063 2110 sx->peer_offered &= ~OPTION_PRDR;
fd98a5c6 2111
14de8063 2112 if (sx->peer_offered & OPTION_PRDR)
2d14f397 2113 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
fd98a5c6
JH
2114#endif
2115
2d14f397 2116 /* Note if the server supports DSN */
14de8063 2117 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2d14f397 2118 DEBUG(D_transport) debug_printf("%susing DSN\n",
14de8063 2119 sx->peer_offered & OPTION_DSN ? "" : "not ");
6c1c3d1d 2120
2d14f397
JH
2121 /* Note if the response to EHLO specifies support for the AUTH extension.
2122 If it has, check that this host is one we want to authenticate to, and do
2123 the business. The host name and address must be available when the
2124 authenticator's client driver is running. */
0756eb3c 2125
d093f8e5
JH
2126 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2127 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2d14f397
JH
2128 {
2129 default: goto SEND_QUIT;
2130 case OK: break;
2131 case FAIL_SEND: goto SEND_FAILED;
2132 case FAIL: goto RESPONSE_FAILED;
2133 }
0756eb3c
PH
2134 }
2135 }
14de8063 2136pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
0756eb3c
PH
2137
2138/* The setting up of the SMTP call is now complete. Any subsequent errors are
2139message-specific. */
2140
d093f8e5 2141sx->setting_up = FALSE;
0756eb3c 2142
8c5d388a 2143#ifdef SUPPORT_I18N
d093f8e5 2144if (sx->addrlist->prop.utf8_msg)
9094b84b 2145 {
d093f8e5
JH
2146 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2147 && !sx->addrlist->prop.utf8_downcvt_maybe;
2148 DEBUG(D_transport) if (!sx->utf8_needed)
59a286ef 2149 debug_printf("utf8: %s downconvert\n",
d093f8e5 2150 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
9094b84b
JH
2151 }
2152
7ade712c 2153/* If this is an international message we need the host to speak SMTPUTF8 */
14de8063 2154if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
7ade712c
JH
2155 {
2156 errno = ERRNO_UTF8_FWD;
2157 goto RESPONSE_FAILED;
2158 }
2159#endif
2160
d093f8e5
JH
2161return OK;
2162
2163
2164 {
2165 int code;
d093f8e5
JH
2166
2167 RESPONSE_FAILED:
d093f8e5 2168 message = NULL;
de6273b4 2169 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
d093f8e5
JH
2170 sx->buffer, &code, &message, &pass_message);
2171 goto FAILED;
d093f8e5
JH
2172
2173 SEND_FAILED:
d093f8e5
JH
2174 code = '4';
2175 message = US string_sprintf("send() to %s [%s] failed: %s",
829dd842 2176 sx->host->name, sx->host->address, strerror(errno));
d093f8e5
JH
2177 sx->send_quit = FALSE;
2178 goto FAILED;
d093f8e5 2179
de6273b4
JH
2180 EHLOHELO_FAILED:
2181 code = '4';
2182 message = string_sprintf("Remote host closed connection in response to %s"
2183 " (EHLO response was: %s)", smtp_command, sx->buffer);
2184 sx->send_quit = FALSE;
2185 goto FAILED;
2186
e5ab0ba9
JH
2187 /* This label is jumped to directly when a TLS negotiation has failed,
2188 or was not done for a host for which it is required. Values will be set
2189 in message and errno, and setting_up will always be true. Treat as
2190 a temporary error. */
2191
d093f8e5
JH
2192#ifdef SUPPORT_TLS
2193 TLS_FAILED:
de6273b4
JH
2194 code = '4';
2195 goto FAILED;
d093f8e5
JH
2196#endif
2197
2198 /* The failure happened while setting up the call; see if the failure was
2199 a 5xx response (this will either be on connection, or following HELO - a 5xx
e69636bc
JH
2200 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2201 fail all addresses, as this host is never going to accept them. For other
2202 errors during setting up (timeouts or whatever), defer all addresses, and
2203 yield DEFER, so that the host is not tried again for a while.
2204
2205 XXX This peeking for another host feels like a layering violation. We want
2206 to note the host as unusable, but down here we shouldn't know if this was
2207 the last host to try for the addr(list). Perhaps the upper layer should be
2208 the one to do set_errno() ? The problem is that currently the addr is where
2209 errno etc. are stashed, but until we run out of hosts to try the errors are
2210 host-specific. Maybe we should enhance the host_item definition? */
d093f8e5 2211
de6273b4 2212FAILED:
d093f8e5 2213 sx->ok = FALSE; /* For when reached by GOTO */
e69636bc
JH
2214 set_errno(sx->addrlist, errno, message,
2215 sx->host->next
2216 ? DEFER
2217 : code == '5'
d093f8e5 2218#ifdef SUPPORT_I18N
e69636bc 2219 || errno == ERRNO_UTF8_FWD
d093f8e5 2220#endif
e69636bc
JH
2221 ? FAIL : DEFER,
2222 pass_message, sx->host
d093f8e5
JH
2223#ifdef EXPERIMENTAL_DSN_INFO
2224 , sx->smtp_greeting, sx->helo_response
2225#endif
2226 );
e69636bc 2227 yield = DEFER;
d093f8e5
JH
2228 }
2229
2230
2231SEND_QUIT:
2232
2233if (sx->send_quit)
4e910c01 2234 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
d093f8e5 2235
d093f8e5
JH
2236#ifdef SUPPORT_TLS
2237tls_close(FALSE, TRUE);
2238#endif
2239
2240/* Close the socket, and return the appropriate value, first setting
2241works because the NULL setting is passed back to the calling process, and
2242remote_max_parallel is forced to 1 when delivering over an existing connection,
b7d3afcf 2243*/
d093f8e5 2244
e1d04f48 2245HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
d093f8e5
JH
2246if (sx->send_quit)
2247 {
2248 shutdown(sx->outblock.sock, SHUT_WR);
2249 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2250 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2251 rc--; /* drain socket */
02b41d71 2252 sx->send_quit = FALSE;
d093f8e5
JH
2253 }
2254(void)close(sx->inblock.sock);
02b41d71 2255sx->inblock.sock = sx->outblock.sock = -1;
d093f8e5
JH
2256
2257#ifndef DISABLE_EVENT
2258(void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2259#endif
2260
2261continue_transport = NULL;
2262continue_hostname = NULL;
2263return yield;
2264}
2265
2266
9be4572b
JH
2267
2268
2269/* Create the string of options that will be appended to the MAIL FROM:
2270in the connection context buffer */
2271
2272static int
2273build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2274{
2275uschar * p = sx->buffer;
2276address_item * addr;
2277int address_count;
2278
2279*p = 0;
2280
14de8063 2281/* If we know the receiving MTA supports the SIZE qualification, and we know it,
9be4572b
JH
2282send it, adding something to the message size to allow for imprecision
2283and things that get added en route. Exim keeps the number of lines
2284in a message, so we can give an accurate value for the original message, but we
2285need some additional to handle added headers. (Double "." characters don't get
2286included in the count.) */
2287
14de8063
JH
2288if ( message_size > 0
2289 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
9be4572b 2290 {
328c5688
JH
2291/*XXX problem here under spool_files_wireformat?
2292Or just forget about lines? Or inflate by a fixed proportion? */
2293
9be4572b
JH
2294 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2295 while (*p) p++;
2296 }
2297
2298#ifndef DISABLE_PRDR
2299/* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2300request that */
2301
2302sx->prdr_active = FALSE;
14de8063 2303if (sx->peer_offered & OPTION_PRDR)
9be4572b
JH
2304 for (addr = addrlist; addr; addr = addr->next)
2305 if (addr->transport_return == PENDING_DEFER)
2306 {
2307 for (addr = addr->next; addr; addr = addr->next)
2308 if (addr->transport_return == PENDING_DEFER)
2309 { /* at least two recipients to send */
2310 sx->prdr_active = TRUE;
2311 sprintf(CS p, " PRDR"); p += 5;
2312 break;
2313 }
2314 break;
2315 }
2316#endif
2317
2318#ifdef SUPPORT_I18N
2319/* If it supports internationalised messages, and this meesage need that,
2320request it */
2321
14de8063 2322if ( sx->peer_offered & OPTION_UTF8
9be4572b
JH
2323 && addrlist->prop.utf8_msg
2324 && !addrlist->prop.utf8_downcvt
2325 )
2326 Ustrcpy(p, " SMTPUTF8"), p += 9;
2327#endif
2328
2329/* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2330for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2331 addr && address_count < sx->max_rcpt;
2332 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2333 {
2334 address_count++;
2335 if (!(addr->dsn_flags & rf_dsnlasthop))
2336 {
2337 sx->dsn_all_lasthop = FALSE;
2338 break;
2339 }
2340 }
2341
2342/* Add any DSN flags to the mail command */
2343
14de8063 2344if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
9be4572b
JH
2345 {
2346 if (dsn_ret == dsn_ret_hdrs)
2347 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2348 else if (dsn_ret == dsn_ret_full)
2349 { Ustrcpy(p, " RET=FULL"); p += 9; }
2350
2351 if (dsn_envid)
2352 {
2353 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2354 while (*p) p++;
2355 }
2356 }
2357
2358/* If an authenticated_sender override has been specified for this transport
2359instance, expand it. If the expansion is forced to fail, and there was already
2360an authenticated_sender for this message, the original value will be used.
2361Other expansion failures are serious. An empty result is ignored, but there is
2362otherwise no check - this feature is expected to be used with LMTP and other
2363cases where non-standard addresses (e.g. without domains) might be required. */
2364
2365if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2366 return ERROR;
2367
2368return OK;
2369}
2370
2371
2372static void
2373build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2374{
2375uschar * p = sx->buffer;
2376*p = 0;
2377
2378/* Add any DSN flags to the rcpt command */
2379
14de8063 2380if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
9be4572b
JH
2381 {
2382 if (addr->dsn_flags & rf_dsnflags)
2383 {
2384 int i;
2385 BOOL first = TRUE;
2386
2387 Ustrcpy(p, " NOTIFY=");
2388 while (*p) p++;
2389 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2390 {
2391 if (!first) *p++ = ',';
2392 first = FALSE;
2393 Ustrcpy(p, rf_names[i]);
2394 while (*p) p++;
2395 }
2396 }
2397
2398 if (addr->dsn_orcpt)
2399 {
2400 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2401 addr->dsn_orcpt);
2402 while (*p) p++;
2403 }
2404 }
2405}
2406
2407
d9c3c8ed
JH
2408
2409/*
2410Return:
e9166683
JH
2411 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2412 -1 MAIL response error
2413 -2 any non-MAIL read i/o error
2414 -3 non-MAIL response timeout
2415 -4 internal error; channel still usable
2416 -5 transmit failed
d9c3c8ed
JH
2417 */
2418
2419int
2420smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2421{
2422address_item * addr;
2423int address_count;
2424int rc;
2425
2426if (build_mailcmd_options(sx, sx->first_addr) != OK)
2427 {
2428 *yield = ERROR;
e9166683 2429 return -4;
d9c3c8ed
JH
2430 }
2431
2432/* From here until we send the DATA command, we can make use of PIPELINING
2433if the server host supports it. The code has to be able to check the responses
2434at any point, for when the buffer fills up, so we write it totally generally.
2435When PIPELINING is off, each command written reports that it has flushed the
2436buffer. */
2437
2438sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2439
2440 {
2441 uschar * s = sx->from_addr;
2442#ifdef SUPPORT_I18N
2443 uschar * errstr = NULL;
2444
2445 /* If we must downconvert, do the from-address here. Remember we had to
2446 for the to-addresses (done below), and also (ugly) for re-doing when building
2447 the delivery log line. */
2448
2449 if ( sx->addrlist->prop.utf8_msg
14de8063 2450 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
d9c3c8ed
JH
2451 )
2452 {
2453 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2454 {
2455 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2456 *yield = ERROR;
e9166683 2457 return -4;
d9c3c8ed
JH
2458 }
2459 setflag(sx->addrlist, af_utf8_downcvt);
2460 }
2461#endif
2462
4e910c01 2463 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
d9c3c8ed
JH
2464 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2465 }
2466
2467mail_command = string_copy(big_buffer); /* Save for later error message */
2468
2469switch(rc)
2470 {
2471 case -1: /* Transmission error */
e9166683 2472 return -5;
d9c3c8ed 2473
df5b41e3 2474 case +1: /* Cmd was sent */
d9c3c8ed
JH
2475 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2476 sx->ob->command_timeout))
2477 {
2478 if (errno == 0 && sx->buffer[0] == '4')
2479 {
2480 errno = ERRNO_MAIL4XX;
2481 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2482 }
2483 return -1;
2484 }
2485 sx->pending_MAIL = FALSE;
2486 break;
e9166683
JH
2487
2488 /* otherwise zero: command queued for pipeline */
d9c3c8ed
JH
2489 }
2490
2491/* Pass over all the relevant recipient addresses for this host, which are the
2492ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2493several before we have to read the responses for those seen so far. This
2494checking is done by a subroutine because it also needs to be done at the end.
2495Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2496the next one if not all are sent.
2497
2498In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2499last address because we want to abort if any recipients have any kind of
2500problem, temporary or permanent. We know that all recipient addresses will have
2501the PENDING_DEFER status, because only one attempt is ever made, and we know
e9166683
JH
2502that max_rcpt will be large, so all addresses will be done at once.
2503
2504For verify we flush the pipeline after any (the only) rcpt address. */
d9c3c8ed
JH
2505
2506for (addr = sx->first_addr, address_count = 0;
2507 addr && address_count < sx->max_rcpt;
2508 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2509 {
2510 int count;
2511 BOOL no_flush;
2512 uschar * rcpt_addr;
2513
a2673768 2514 if (tcp_out_fastopen && !tcp_out_fastopen_logged)
1ccd5f67
JH
2515 {
2516 setflag(addr, af_tcp_fastopen_conn);
2517 if (tcp_out_fastopen > 1) setflag(addr, af_tcp_fastopen);
2518 }
a2673768 2519
14de8063 2520 addr->dsn_aware = sx->peer_offered & OPTION_DSN
d9c3c8ed
JH
2521 ? dsn_support_yes : dsn_support_no;
2522
2523 address_count++;
4c2471ca
JH
2524 no_flush = pipelining_active && !sx->verify
2525 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
d9c3c8ed
JH
2526
2527 build_rcptcmd_options(sx, addr);
2528
2529 /* Now send the RCPT command, and process outstanding responses when
2530 necessary. After a timeout on RCPT, we just end the function, leaving the
2531 yield as OK, because this error can often mean that there is a problem with
2532 just one address, so we don't want to delay the host. */
2533
2534 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2535
2536#ifdef SUPPORT_I18N
2537 if ( testflag(sx->addrlist, af_utf8_downcvt)
2538 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2539 )
2540 {
2541 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2542 errno = ERRNO_EXPANDFAIL;
e9166683 2543 return -5; /*XXX too harsh? */
d9c3c8ed
JH
2544 }
2545#endif
2546
4e910c01
JH
2547 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2548 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
d9c3c8ed 2549
e9166683 2550 if (count < 0) return -5;
d9c3c8ed
JH
2551 if (count > 0)
2552 {
df5b41e3 2553 switch(sync_responses(sx, count, 0))
d9c3c8ed
JH
2554 {
2555 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2556 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
e9166683 2557 break;
d9c3c8ed
JH
2558
2559 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2560 if (!sx->lmtp) /* can't tell about progress yet */
2561 sx->completed_addr = TRUE;
2562 case 0: /* No 2xx or 5xx, but no probs */
2563 break;
2564
e9166683
JH
2565 case -1: return -3; /* Timeout on RCPT */
2566 case -2: return -2; /* non-MAIL read i/o error */
2567 default: return -1; /* any MAIL error */
d9c3c8ed
JH
2568 }
2569 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2570 }
2571 } /* Loop for next address */
2572
a2673768 2573tcp_out_fastopen_logged = TRUE;
d9c3c8ed
JH
2574sx->next_addr = addr;
2575return 0;
2576}
2577
2578
875512a3
JH
2579#ifdef SUPPORT_TLS
2580/*****************************************************
2581* Proxy TLS connection for another transport process *
2582******************************************************/
2583/*
d097cc73
JH
2584Close the unused end of the pipe, fork once more, then use the given buffer
2585as a staging area, and select on both the given fd and the TLS'd client-fd for
2586data to read (per the coding in ip_recv() and fd_ready() this is legitimate).
2587Do blocking full-size writes, and reads under a timeout. Once both input
2588channels are closed, exit the process.
875512a3
JH
2589
2590Arguments:
57cc2785
JH
2591 buf space to use for buffering
2592 bufsiz size of buffer
d097cc73 2593 pfd pipe filedescriptor array; [0] is comms to proxied process
875512a3
JH
2594 timeout per-read timeout, seconds
2595*/
2596
57cc2785 2597void
d097cc73 2598smtp_proxy_tls(uschar * buf, size_t bsize, int * pfd, int timeout)
875512a3 2599{
e47252f5 2600fd_set rfds, efds;
d097cc73 2601int max_fd = MAX(pfd[0], tls_out.active) + 1;
875512a3
JH
2602int rc, i, fd_bits, nbytes;
2603
d097cc73
JH
2604close(pfd[1]);
2605if ((rc = fork()))
2606 {
2607 DEBUG(D_transport) debug_printf("proxy-proc final-pid %d\n", rc);
2608 _exit(rc < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
2609 }
2610
626810b9 2611if (running_in_test_harness) millisleep(100); /* let parent debug out */
875512a3 2612set_process_info("proxying TLS connection for continued transport");
e47252f5
JH
2613FD_ZERO(&rfds);
2614FD_SET(tls_out.active, &rfds);
d097cc73 2615FD_SET(pfd[0], &rfds);
875512a3
JH
2616
2617for (fd_bits = 3; fd_bits; )
2618 {
2619 time_t time_left = timeout;
2620 time_t time_start = time(NULL);
2621
2622 /* wait for data */
e47252f5 2623 efds = rfds;
875512a3
JH
2624 do
2625 {
2626 struct timeval tv = { time_left, 0 };
2627
e47252f5
JH
2628 rc = select(max_fd,
2629 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
875512a3
JH
2630
2631 if (rc < 0 && errno == EINTR)
2632 if ((time_left -= time(NULL) - time_start) > 0) continue;
2633
2634 if (rc <= 0)
2635 {
2636 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
d097cc73 2637 goto done;
875512a3 2638 }
e47252f5 2639
d097cc73 2640 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(pfd[0], &efds))
e47252f5
JH
2641 {
2642 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
d097cc73
JH
2643 FD_ISSET(pfd[0], &efds) ? "proxy" : "tls");
2644 goto done;
e47252f5 2645 }
875512a3 2646 }
d097cc73 2647 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(pfd[0], &rfds)));
875512a3
JH
2648
2649 /* handle inbound data */
e47252f5 2650 if (FD_ISSET(tls_out.active, &rfds))
57cc2785 2651 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
875512a3
JH
2652 {
2653 fd_bits &= ~1;
e47252f5 2654 FD_CLR(tls_out.active, &rfds);
d097cc73 2655 shutdown(pfd[0], SHUT_WR);
e47252f5 2656 timeout = 5;
875512a3
JH
2657 }
2658 else
2659 {
2660 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
d097cc73 2661 if ((i = write(pfd[0], buf + nbytes, rc - nbytes)) < 0) goto done;
875512a3
JH
2662 }
2663 else if (fd_bits & 1)
e47252f5 2664 FD_SET(tls_out.active, &rfds);
875512a3
JH
2665
2666 /* handle outbound data */
d097cc73
JH
2667 if (FD_ISSET(pfd[0], &rfds))
2668 if ((rc = read(pfd[0], buf, bsize)) <= 0)
875512a3 2669 {
e47252f5
JH
2670 fd_bits = 0;
2671 tls_close(FALSE, TRUE);
875512a3
JH
2672 }
2673 else
2674 {
2675 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
925ac8e4 2676 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
d097cc73 2677 goto done;
875512a3
JH
2678 }
2679 else if (fd_bits & 2)
d097cc73 2680 FD_SET(pfd[0], &rfds);
875512a3 2681 }
d097cc73
JH
2682
2683done:
2684 if (running_in_test_harness) millisleep(100); /* let logging complete */
2685 exim_exit(0, US"TLS proxy");
875512a3
JH
2686}
2687#endif
2688
2689
d093f8e5
JH
2690/*************************************************
2691* Deliver address list to given host *
2692*************************************************/
2693
2694/* If continue_hostname is not null, we get here only when continuing to
2695deliver down an existing channel. The channel was passed as the standard
2696input. TLS is never active on a passed channel; the previous process always
2697closes it down before passing the connection on.
2698
2699Otherwise, we have to make a connection to the remote host, and do the
2700initial protocol exchange.
2701
2702When running as an MUA wrapper, if the sender or any recipient is rejected,
2703temporarily or permanently, we force failure for all recipients.
2704
2705Arguments:
2706 addrlist chain of potential addresses to deliver; only those whose
2707 transport_return field is set to PENDING_DEFER are currently
2708 being processed; others should be skipped - they have either
2709 been delivered to an earlier host or IP address, or been
2710 failed by one of them.
2711 host host to deliver to
2712 host_af AF_INET or AF_INET6
a843a57e
JH
2713 defport default TCP/IP port to use if host does not specify, in host
2714 byte order
d093f8e5
JH
2715 interface interface to bind to, or NULL
2716 tblock transport instance block
2717 message_defer set TRUE if yield is OK, but all addresses were deferred
2718 because of a non-recipient, non-host failure, that is, a
2719 4xx response to MAIL FROM, DATA, or ".". This is a defer
2720 that is specific to the message.
2721 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2722 a second attempt after TLS initialization fails
2723
2724Returns: OK - the connection was made and the delivery attempted;
2725 the result for each address is in its data block.
2726 DEFER - the connection could not be made, or something failed
2727 while setting up the SMTP session, or there was a
2728 non-message-specific error, such as a timeout.
2729 ERROR - a filter command is specified for this transport,
2730 and there was a problem setting it up; OR helo_data
2731 or add_headers or authenticated_sender is specified
2732 for this transport, and the string failed to expand
2733*/
2734
2735static int
a843a57e 2736smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
d093f8e5
JH
2737 uschar *interface, transport_instance *tblock,
2738 BOOL *message_defer, BOOL suppress_tls)
2739{
2740address_item *addr;
d093f8e5 2741int yield = OK;
d093f8e5
JH
2742int save_errno;
2743int rc;
32dfdf8b 2744struct timeval start_delivery_time;
d093f8e5 2745
d093f8e5
JH
2746BOOL pass_message = FALSE;
2747uschar *message = NULL;
2748uschar new_message_id[MESSAGE_ID_LENGTH + 1];
d093f8e5
JH
2749
2750smtp_context sx;
2751
32dfdf8b 2752gettimeofday(&start_delivery_time, NULL);
d093f8e5 2753suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
02b41d71 2754*message_defer = FALSE;
d093f8e5
JH
2755
2756sx.addrlist = addrlist;
2757sx.host = host;
2758sx.host_af = host_af,
a843a57e 2759sx.port = defport;
d093f8e5 2760sx.interface = interface;
02b41d71 2761sx.helo_data = NULL;
d093f8e5 2762sx.tblock = tblock;
e9166683 2763sx.verify = FALSE;
d093f8e5 2764
9be4572b
JH
2765/* Get the channel set up ready for a message (MAIL FROM being the next
2766SMTP command to send */
2767
e9166683 2768if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
d093f8e5
JH
2769 return rc;
2770
0756eb3c
PH
2771/* If there is a filter command specified for this transport, we can now
2772set it up. This cannot be done until the identify of the host is known. */
2773
e9166683 2774if (tblock->filter_command)
0756eb3c 2775 {
9b989985 2776 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
2777
2778 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2779 yield ERROR. */
2780
36d295f1
JH
2781 if (!transport_set_up_command(&transport_filter_argv,
2782 tblock->filter_command, TRUE, DEFER, addrlist,
2783 string_sprintf("%.50s transport", tblock->name), NULL))
0756eb3c 2784 {
895fbaf2
JH
2785 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2786 FALSE);
0756eb3c
PH
2787 yield = ERROR;
2788 goto SEND_QUIT;
2789 }
48f1c853
JH
2790
2791 if ( transport_filter_argv
2792 && *transport_filter_argv
2793 && **transport_filter_argv
14de8063 2794 && sx.peer_offered & OPTION_CHUNKING
48f1c853
JH
2795 )
2796 {
14de8063 2797 sx.peer_offered &= ~OPTION_CHUNKING;
48f1c853
JH
2798 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2799 }
0756eb3c
PH
2800 }
2801
36d295f1 2802sx.first_addr = addrlist;
0756eb3c
PH
2803
2804/* For messages that have more than the maximum number of envelope recipients,
2805we want to send several transactions down the same SMTP connection. (See
2806comments in deliver.c as to how this reconciles, heuristically, with
2807remote_max_parallel.) This optimization was added to Exim after the following
2808code was already working. The simplest way to put it in without disturbing the
2809code was to use a goto to jump back to this point when there is another
2810transaction to handle. */
2811
2812SEND_MESSAGE:
d9c3c8ed 2813sx.from_addr = return_path;
36d295f1 2814sx.sync_addr = sx.first_addr;
d093f8e5
JH
2815sx.ok = FALSE;
2816sx.send_rset = TRUE;
d9c3c8ed 2817sx.completed_addr = FALSE;
0756eb3c
PH
2818
2819
57cc2785
JH
2820/* If we are a continued-connection-after-verify the MAIL and RCPT
2821commands were already sent; do not re-send but do mark the addrs as
2822having been accepted up to RCPT stage. A traditional cont-conn
2823always has a sequence number greater than one. */
6b62e899 2824
57cc2785 2825if (continue_hostname && continue_sequence == 1)
0756eb3c 2826 {
57cc2785 2827 address_item * addr;
0756eb3c 2828
57cc2785 2829 sx.peer_offered = smtp_peer_options;
d8b8dd15 2830 sx.pending_MAIL = FALSE;
57cc2785
JH
2831 sx.ok = TRUE;
2832 sx.next_addr = NULL;
0756eb3c 2833
57cc2785
JH
2834 for (addr = addrlist; addr; addr = addr->next)
2835 addr->transport_return = PENDING_OK;
2836 }
2837else
0756eb3c 2838 {
57cc2785
JH
2839 /* Initiate a message transfer. */
2840
2841 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2842 {
2843 case 0: break;
2844 case -1: case -2: goto RESPONSE_FAILED;
2845 case -3: goto END_OFF;
2846 case -4: goto SEND_QUIT;
2847 default: goto SEND_FAILED;
2848 }
2849
2850 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2851 permanently or temporarily. We should have flushed and synced after the last
2852 RCPT. */
2853
2854 if (mua_wrapper)
2855 {
4c2471ca
JH
2856 address_item * a;
2857 unsigned cnt;
2858
2859 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2860 if (a->transport_return != PENDING_OK)
57cc2785
JH
2861 {
2862 /*XXX could we find a better errno than 0 here? */
4c2471ca
JH
2863 set_errno_nohost(addrlist, 0, a->message, FAIL,
2864 testflag(a, af_pass_message));
57cc2785
JH
2865 sx.ok = FALSE;
2866 break;
2867 }
2868 }
0756eb3c
PH
2869 }
2870
2871/* If ok is TRUE, we know we have got at least one good recipient, and must now
2872send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2873have a good recipient buffered up if we are pipelining. We don't want to waste
2874time sending DATA needlessly, so we only send it if either ok is TRUE or if we
6d5c916c
JH
2875are pipelining. The responses are all handled by sync_responses().
2876If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2877to send is. */
0756eb3c 2878
14de8063 2879if ( !(sx.peer_offered & OPTION_CHUNKING)
d093f8e5 2880 && (sx.ok || (pipelining_active && !mua_wrapper)))
0756eb3c 2881 {
4e910c01 2882 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
6d5c916c 2883
0756eb3c 2884 if (count < 0) goto SEND_FAILED;
df5b41e3 2885 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
0756eb3c 2886 {
d093f8e5 2887 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
d9c3c8ed 2888 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
0756eb3c
PH
2889 break;
2890
d093f8e5 2891 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
d9c3c8ed 2892 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
0756eb3c
PH
2893 case 0: break; /* No 2xx or 5xx, but no probs */
2894
2895 case -1: goto END_OFF; /* Timeout on RCPT */
2896 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2897 }
0d9fa8c0 2898 pipelining_active = FALSE;
87cb4a16 2899 data_command = string_copy(big_buffer); /* Save for later error message */
0756eb3c
PH
2900 }
2901
0756eb3c
PH
2902/* If there were no good recipients (but otherwise there have been no
2903problems), just set ok TRUE, since we have handled address-specific errors
2904already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2905for handling the SMTP dot-handling protocol, flagging to apply to headers as
2906well as body. Set the appropriate timeout value to be used for each chunk.
2907(Haven't been able to make it work using select() for writing yet.) */
2908
14de8063 2909if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
6d5c916c
JH
2910 {
2911 /* Save the first address of the next batch. */
d9c3c8ed 2912 sx.first_addr = sx.next_addr;
6d5c916c 2913
d093f8e5 2914 sx.ok = TRUE;
6d5c916c 2915 }
ff5aac2b 2916else
0756eb3c 2917 {
6b46ecc6 2918 transport_ctx tctx = {
cab0c277 2919 {sx.inblock.sock},
6b46ecc6
JH
2920 tblock,
2921 addrlist,
2922 US".", US"..", /* Escaping strings */
65de12cc 2923 topt_use_crlf | topt_escape_headers
6b46ecc6
JH
2924 | (tblock->body_only ? topt_no_headers : 0)
2925 | (tblock->headers_only ? topt_no_body : 0)
2926 | (tblock->return_path_add ? topt_add_return_path : 0)
2927 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2928 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2929 };
2930
6d5c916c
JH
2931 /* If using CHUNKING we need a callback from the generic transport
2932 support to us, for the sending of BDAT smtp commands and the reaping
2933 of responses. The callback needs a whole bunch of state so set up
2934 a transport-context structure to be passed around. */
2935
14de8063 2936 if (sx.peer_offered & OPTION_CHUNKING)
59932f7d 2937 {
65de12cc 2938 tctx.check_string = tctx.escape_string = NULL;
6d5c916c
JH
2939 tctx.options |= topt_use_bdat;
2940 tctx.chunk_cb = smtp_chunk_cmd_callback;
e9166683
JH
2941 sx.pending_BDAT = FALSE;
2942 sx.good_RCPT = sx.ok;
2943 sx.cmd_count = 0;
2944 tctx.smtp_context = &sx;
59932f7d
JH
2945 }
2946 else
65de12cc 2947 tctx.options |= topt_end_dot;
59932f7d 2948
6d5c916c 2949 /* Save the first address of the next batch. */
d9c3c8ed 2950 sx.first_addr = sx.next_addr;
6d5c916c 2951
e027f545
JH
2952 /* Responses from CHUNKING commands go in buffer. Otherwise,
2953 there has not been a response. */
2954
d093f8e5 2955 sx.buffer[0] = 0;
e027f545 2956
0756eb3c 2957 sigalrm_seen = FALSE;
d093f8e5 2958 transport_write_timeout = sx.ob->data_timeout;
0756eb3c
PH
2959 smtp_command = US"sending data block"; /* For error messages */
2960 DEBUG(D_transport|D_v)
14de8063 2961 if (sx.peer_offered & OPTION_CHUNKING)
6d5c916c
JH
2962 debug_printf(" will write message using CHUNKING\n");
2963 else
2964 debug_printf(" SMTP>> writing message and terminating \".\"\n");
0756eb3c 2965 transport_count = 0;
a7538db1 2966
80a47a2c 2967#ifndef DISABLE_DKIM
42055a33 2968 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
4cd12fe9 2969#else
42055a33 2970 sx.ok = transport_write_message(&tctx, 0);
4cd12fe9 2971#endif
0756eb3c
PH
2972
2973 /* transport_write_message() uses write() because it is called from other
2974 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2975 it can exit with "Broken pipe" as its error. This really means that the
2976 socket got closed at the far end. */
2977
2978 transport_write_timeout = 0; /* for subsequent transports */
2979
2980 /* Failure can either be some kind of I/O disaster (including timeout),
e027f545
JH
2981 or the failure of a transport filter or the expansion of added headers.
2982 Or, when CHUNKING, it can be a protocol-detected failure. */
0756eb3c 2983
d093f8e5 2984 if (!sx.ok)
b9df1829
JH
2985 if (message) goto SEND_FAILED;
2986 else goto RESPONSE_FAILED;
0756eb3c
PH
2987
2988 /* We used to send the terminating "." explicitly here, but because of
2989 buffering effects at both ends of TCP/IP connections, you don't gain
2990 anything by keeping it separate, so it might as well go in the final
2991 data buffer for efficiency. This is now done by setting the topt_end_dot
2992 flag above. */
2993
2994 smtp_command = US"end of data";
2995
14de8063 2996 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
6d5c916c
JH
2997 {
2998 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
e9166683 2999 switch(sync_responses(&sx, sx.cmd_count-1, 0))
6d5c916c 3000 {
d093f8e5 3001 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
d9c3c8ed 3002 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
6d5c916c
JH
3003 break;
3004
d093f8e5 3005 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
d9c3c8ed 3006 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
6d5c916c
JH
3007 case 0: break; /* No 2xx or 5xx, but no probs */
3008
3009 case -1: goto END_OFF; /* Timeout on RCPT */
3010 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
3011 }
3012 }
3013
8ccd00b1 3014#ifndef DISABLE_PRDR
fd98a5c6
JH
3015 /* For PRDR we optionally get a partial-responses warning
3016 * followed by the individual responses, before going on with
3017 * the overall response. If we don't get the warning then deal
3018 * with per non-PRDR. */
d093f8e5 3019 if(sx.prdr_active)
fd98a5c6 3020 {
d093f8e5
JH
3021 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
3022 sx.ob->final_timeout);
3023 if (!sx.ok && errno == 0) switch(sx.buffer[0])
e027f545 3024 {
d093f8e5
JH
3025 case '2': sx.prdr_active = FALSE;
3026 sx.ok = TRUE;
e027f545
JH
3027 break;
3028 case '4': errno = ERRNO_DATA4XX;
3029 addrlist->more_errno |=
d093f8e5 3030 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
e027f545
JH
3031 break;
3032 }
fd98a5c6
JH
3033 }
3034 else
3035#endif
3036
3037 /* For non-PRDR SMTP, we now read a single response that applies to the
3038 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 3039
d093f8e5 3040 if (!sx.lmtp)
e97957bc 3041 {
d093f8e5
JH
3042 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3043 sx.ob->final_timeout);
3044 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
e97957bc
PH
3045 {
3046 errno = ERRNO_DATA4XX;
d093f8e5 3047 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
e97957bc
PH
3048 }
3049 }
0756eb3c
PH
3050
3051 /* For LMTP, we get back a response for every RCPT command that we sent;
3052 some may be accepted and some rejected. For those that get a response, their
3053 status is fixed; any that are accepted have been handed over, even if later
3054 responses crash - at least, that's how I read RFC 2033.
3055
3056 If all went well, mark the recipient addresses as completed, record which
3057 host/IPaddress they were delivered to, and cut out RSET when sending another
3058 message down the same channel. Write the completed addresses to the journal
3059 now so that they are recorded in case there is a crash of hardware or
3060 software before the spool gets updated. Also record the final SMTP
3061 confirmation if needed (for SMTP only). */
3062
d093f8e5 3063 if (sx.ok)
0756eb3c
PH
3064 {
3065 int flag = '=';
32dfdf8b 3066 struct timeval delivery_time;
0756eb3c 3067 int len;
32dfdf8b 3068 uschar * conf = NULL;
0d9fa8c0 3069
32dfdf8b 3070 timesince(&delivery_time, &start_delivery_time);
d093f8e5 3071 sx.send_rset = FALSE;
0d9fa8c0 3072 pipelining_active = FALSE;
0756eb3c 3073
0756eb3c
PH
3074 /* Set up confirmation if needed - applies only to SMTP */
3075
d68218c7 3076 if (
0cbf2b82 3077#ifdef DISABLE_EVENT
6c6d6e48 3078 LOGGING(smtp_confirmation) &&
a7538db1 3079#endif
d093f8e5 3080 !sx.lmtp
d68218c7 3081 )
0756eb3c 3082 {
d093f8e5 3083 const uschar *s = string_printing(sx.buffer);
55414b25 3084 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
5903c6ff 3085 conf = (s == sx.buffer)? US string_copy(s) : US s;
0756eb3c
PH
3086 }
3087
fd98a5c6 3088 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
3089 each one. */
3090
d9c3c8ed 3091 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
0756eb3c
PH
3092 {
3093 if (addr->transport_return != PENDING_OK) continue;
3094
3095 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3096 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
3097 address. For temporary errors, add a retry item for the address so that
3098 it doesn't get tried again too soon. */
0756eb3c 3099
8ccd00b1 3100#ifndef DISABLE_PRDR
d093f8e5 3101 if (sx.lmtp || sx.prdr_active)
fd98a5c6 3102#else
d093f8e5 3103 if (sx.lmtp)
fd98a5c6 3104#endif
0756eb3c 3105 {
d093f8e5
JH
3106 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3107 sx.ob->final_timeout))
0756eb3c 3108 {
d093f8e5 3109 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 3110 addr->message = string_sprintf(
8ccd00b1 3111#ifndef DISABLE_PRDR
d093f8e5 3112 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
fd98a5c6
JH
3113#else
3114 "LMTP error after %s: %s",
3115#endif
d093f8e5 3116 data_command, string_printing(sx.buffer));
75def545 3117 setflag(addr, af_pass_message); /* Allow message to go to user */
d093f8e5 3118 if (sx.buffer[0] == '5')
75def545
PH
3119 addr->transport_return = FAIL;
3120 else
3121 {
e97957bc 3122 errno = ERRNO_DATA4XX;
d093f8e5 3123 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
75def545 3124 addr->transport_return = DEFER;
8ccd00b1 3125#ifndef DISABLE_PRDR
d093f8e5 3126 if (!sx.prdr_active)
fd98a5c6
JH
3127#endif
3128 retry_add_item(addr, addr->address_retry_key, 0);
75def545 3129 }
0756eb3c
PH
3130 continue;
3131 }
d9c3c8ed 3132 sx.completed_addr = TRUE; /* NOW we can set this flag */
6c6d6e48 3133 if (LOGGING(smtp_confirmation))
c0ea85ab 3134 {
d093f8e5 3135 const uschar *s = string_printing(sx.buffer);
55414b25 3136 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
d093f8e5 3137 conf = (s == sx.buffer) ? US string_copy(s) : US s;
c0ea85ab 3138 }
0756eb3c
PH
3139 }
3140
3141 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 3142 actual host that was used. */
0756eb3c
PH
3143
3144 addr->transport_return = OK;
32dfdf8b
JH
3145 addr->more_errno = delivery_time.tv_sec;
3146 addr->delivery_usec = delivery_time.tv_usec;
d427a7f9 3147 addr->host_used = host;
0756eb3c
PH
3148 addr->special_action = flag;
3149 addr->message = conf;
8ccd00b1 3150#ifndef DISABLE_PRDR
7eb0e5d2 3151 if (sx.prdr_active) setflag(addr, af_prdr_used);
fd98a5c6 3152#endif
7eb0e5d2 3153 if (sx.peer_offered & OPTION_CHUNKING) setflag(addr, af_chunking_used);
0756eb3c
PH
3154 flag = '-';
3155
8ccd00b1 3156#ifndef DISABLE_PRDR
d093f8e5 3157 if (!sx.prdr_active)
fd98a5c6
JH
3158#endif
3159 {
3160 /* Update the journal. For homonymic addresses, use the base address plus
3161 the transport name. See lots of comments in deliver.c about the reasons
3162 for the complications when homonyms are involved. Just carry on after
3163 write error, as it may prove possible to update the spool file later. */
4d8d62b9 3164
fd98a5c6 3165 if (testflag(addr, af_homonym))
d093f8e5 3166 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
fd98a5c6 3167 else
d093f8e5 3168 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
4d8d62b9 3169
5bfe3b35 3170 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
d093f8e5
JH
3171 len = Ustrlen(CS sx.buffer);
3172 if (write(journal_fd, sx.buffer, len) != len)
fd98a5c6 3173 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
d093f8e5 3174 "%s: %s", sx.buffer, strerror(errno));
fd98a5c6 3175 }
0756eb3c
PH
3176 }
3177
8ccd00b1 3178#ifndef DISABLE_PRDR
d093f8e5 3179 if (sx.prdr_active)
fd98a5c6
JH
3180 {
3181 /* PRDR - get the final, overall response. For any non-success
3182 upgrade all the address statuses. */
d093f8e5
JH
3183 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3184 sx.ob->final_timeout);
3185 if (!sx.ok)
fd98a5c6 3186 {
d093f8e5 3187 if(errno == 0 && sx.buffer[0] == '4')
fd98a5c6
JH
3188 {
3189 errno = ERRNO_DATA4XX;
d093f8e5 3190 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
fd98a5c6 3191 }
d9c3c8ed 3192 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)