tidying
[exim.git] / src / src / transports / smtp.c
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
d4e5e70b 5/* Copyright (c) University of Cambridge 1995 - 2017 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
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11
12/* Options specific to the smtp transport. This transport also supports LMTP
13over TCP/IP. The options must be in alphabetic order (note that "_" comes
14before the lower case letters). Some live in the transport_instance block so as
15to be publicly visible; these are flagged with opt_public. */
16
17optionlist smtp_transport_options[] = {
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18 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
19 (void *)offsetof(transport_instance, expand_multi_domain) },
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20 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
21 (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) },
22
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23 { "address_retry_include_sender", opt_bool,
24 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
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25 { "allow_localhost", opt_bool,
26 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
27 { "authenticated_sender", opt_stringptr,
28 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
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29 { "authenticated_sender_force", opt_bool,
30 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
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31 { "command_timeout", opt_time,
32 (void *)offsetof(smtp_transport_options_block, command_timeout) },
33 { "connect_timeout", opt_time,
34 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
35 { "connection_max_messages", opt_int | opt_public,
36 (void *)offsetof(transport_instance, connection_max_messages) },
37 { "data_timeout", opt_time,
38 (void *)offsetof(smtp_transport_options_block, data_timeout) },
39 { "delay_after_cutoff", opt_bool,
40 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 41#ifndef DISABLE_DKIM
f7572e5a 42 { "dkim_canon", opt_stringptr,
ff5aac2b 43 (void *)offsetof(smtp_transport_options_block, dkim.dkim_canon) },
f7572e5a 44 { "dkim_domain", opt_stringptr,
ff5aac2b 45 (void *)offsetof(smtp_transport_options_block, dkim.dkim_domain) },
f7572e5a 46 { "dkim_private_key", opt_stringptr,
ff5aac2b 47 (void *)offsetof(smtp_transport_options_block, dkim.dkim_private_key) },
f7572e5a 48 { "dkim_selector", opt_stringptr,
ff5aac2b 49 (void *)offsetof(smtp_transport_options_block, dkim.dkim_selector) },
f7572e5a 50 { "dkim_sign_headers", opt_stringptr,
ff5aac2b 51 (void *)offsetof(smtp_transport_options_block, dkim.dkim_sign_headers) },
f7572e5a 52 { "dkim_strict", opt_stringptr,
ff5aac2b 53 (void *)offsetof(smtp_transport_options_block, dkim.dkim_strict) },
80a47a2c 54#endif
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55 { "dns_qualify_single", opt_bool,
56 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
57 { "dns_search_parents", opt_bool,
58 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
578897ea 59 { "dnssec_request_domains", opt_stringptr,
7cd171b7 60 (void *)offsetof(smtp_transport_options_block, dnssec.request) },
578897ea 61 { "dnssec_require_domains", opt_stringptr,
7cd171b7 62 (void *)offsetof(smtp_transport_options_block, dnssec.require) },
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63 { "dscp", opt_stringptr,
64 (void *)offsetof(smtp_transport_options_block, dscp) },
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65 { "fallback_hosts", opt_stringptr,
66 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
67 { "final_timeout", opt_time,
68 (void *)offsetof(smtp_transport_options_block, final_timeout) },
69 { "gethostbyname", opt_bool,
70 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
71 { "helo_data", opt_stringptr,
72 (void *)offsetof(smtp_transport_options_block, helo_data) },
73 { "hosts", opt_stringptr,
74 (void *)offsetof(smtp_transport_options_block, hosts) },
75 { "hosts_avoid_esmtp", opt_stringptr,
76 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
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77 { "hosts_avoid_pipelining", opt_stringptr,
78 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 79#ifdef SUPPORT_TLS
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80 { "hosts_avoid_tls", opt_stringptr,
81 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 82#endif
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83 { "hosts_max_try", opt_int,
84 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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85 { "hosts_max_try_hardlimit", opt_int,
86 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 87#ifdef SUPPORT_TLS
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88 { "hosts_nopass_tls", opt_stringptr,
89 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
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90 { "hosts_noproxy_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_noproxy_tls) },
80a47a2c 92#endif
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93 { "hosts_override", opt_bool,
94 (void *)offsetof(smtp_transport_options_block, hosts_override) },
95 { "hosts_randomize", opt_bool,
96 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 97#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
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98 { "hosts_request_ocsp", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
100#endif
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101 { "hosts_require_auth", opt_stringptr,
102 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 103#ifdef SUPPORT_TLS
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104# ifdef EXPERIMENTAL_DANE
105 { "hosts_require_dane", opt_stringptr,
106 (void *)offsetof(smtp_transport_options_block, hosts_require_dane) },
107# endif
f2de3a33 108# ifndef DISABLE_OCSP
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109 { "hosts_require_ocsp", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
111# endif
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112 { "hosts_require_tls", opt_stringptr,
113 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 114#endif
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115 { "hosts_try_auth", opt_stringptr,
116 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
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117 { "hosts_try_chunking", opt_stringptr,
118 (void *)offsetof(smtp_transport_options_block, hosts_try_chunking) },
7a31d643 119#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
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120 { "hosts_try_dane", opt_stringptr,
121 (void *)offsetof(smtp_transport_options_block, hosts_try_dane) },
122#endif
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123 { "hosts_try_fastopen", opt_stringptr,
124 (void *)offsetof(smtp_transport_options_block, hosts_try_fastopen) },
8ccd00b1 125#ifndef DISABLE_PRDR
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126 { "hosts_try_prdr", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
128#endif
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129#ifdef SUPPORT_TLS
130 { "hosts_verify_avoid_tls", opt_stringptr,
131 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
132#endif
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133 { "interface", opt_stringptr,
134 (void *)offsetof(smtp_transport_options_block, interface) },
135 { "keepalive", opt_bool,
136 (void *)offsetof(smtp_transport_options_block, keepalive) },
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137 { "lmtp_ignore_quota", opt_bool,
138 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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139 { "max_rcpt", opt_int | opt_public,
140 (void *)offsetof(transport_instance, max_addresses) },
506900af 141 { "multi_domain", opt_expand_bool | opt_public,
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142 (void *)offsetof(transport_instance, multi_domain) },
143 { "port", opt_stringptr,
144 (void *)offsetof(smtp_transport_options_block, port) },
145 { "protocol", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, protocol) },
9c695f6d 147 { "retry_include_ip_address", opt_expand_bool,
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148 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
149 { "serialize_hosts", opt_stringptr,
150 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
151 { "size_addition", opt_int,
152 (void *)offsetof(smtp_transport_options_block, size_addition) }
f0989ec0 153#ifdef SUPPORT_SOCKS
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154 ,{ "socks_proxy", opt_stringptr,
155 (void *)offsetof(smtp_transport_options_block, socks_proxy) }
156#endif
80a47a2c 157#ifdef SUPPORT_TLS
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158 ,{ "tls_certificate", opt_stringptr,
159 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
160 { "tls_crl", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_crl) },
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162 { "tls_dh_min_bits", opt_int,
163 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
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164 { "tls_privatekey", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 166 { "tls_require_ciphers", opt_stringptr,
0756eb3c 167 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
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168 { "tls_sni", opt_stringptr,
169 (void *)offsetof(smtp_transport_options_block, tls_sni) },
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170 { "tls_tempfail_tryclear", opt_bool,
171 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
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172 { "tls_try_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
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174 { "tls_verify_cert_hostnames", opt_stringptr,
175 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
0756eb3c 176 { "tls_verify_certificates", opt_stringptr,
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177 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
178 { "tls_verify_hosts", opt_stringptr,
179 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 180#endif
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181};
182
183/* Size of the options list. An extern variable has to be used so that its
184address can appear in the tables drtables.c. */
185
186int smtp_transport_options_count =
187 sizeof(smtp_transport_options)/sizeof(optionlist);
188
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189
190#ifdef MACRO_PREDEF
191
192/* Dummy values */
193smtp_transport_options_block smtp_transport_option_defaults = {0};
194void smtp_transport_init(transport_instance *tblock) {}
195BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
196void smtp_transport_closedown(transport_instance *tblock) {}
197
198#else /*!MACRO_PREDEF*/
199
200
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201/* Default private options block for the smtp transport. */
202
203smtp_transport_options_block smtp_transport_option_defaults = {
204 NULL, /* hosts */
205 NULL, /* fallback_hosts */
206 NULL, /* hostlist */
207 NULL, /* fallback_hostlist */
208 NULL, /* authenticated_sender */
209 US"$primary_hostname", /* helo_data */
210 NULL, /* interface */
211 NULL, /* port */
212 US"smtp", /* protocol */
9e4f5962 213 NULL, /* DSCP */
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214 NULL, /* serialize_hosts */
215 NULL, /* hosts_try_auth */
216 NULL, /* hosts_require_auth */
f98442df 217 US"*", /* hosts_try_chunking */
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218#ifdef EXPERIMENTAL_DANE
219 NULL, /* hosts_try_dane */
7a31d643 220 NULL, /* hosts_require_dane */
96e47838 221#endif
fb05276a 222 NULL, /* hosts_try_fastopen */
8ccd00b1 223#ifndef DISABLE_PRDR
f98442df 224 US"*", /* hosts_try_prdr */
fd98a5c6 225#endif
f2de3a33 226#ifndef DISABLE_OCSP
0e66b3b6 227 US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
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228 NULL, /* hosts_require_ocsp */
229#endif
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230 NULL, /* hosts_require_tls */
231 NULL, /* hosts_avoid_tls */
6c9ed72e 232 NULL, /* hosts_verify_avoid_tls */
c51b8e75 233 NULL, /* hosts_avoid_pipelining */
0756eb3c 234 NULL, /* hosts_avoid_esmtp */
57cc2785 235#ifdef SUPPORT_TLS
0756eb3c 236 NULL, /* hosts_nopass_tls */
875512a3 237 US"*", /* hosts_noproxy_tls */
57cc2785 238#endif
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239 5*60, /* command_timeout */
240 5*60, /* connect_timeout; shorter system default overrides */
241 5*60, /* data timeout */
242 10*60, /* final timeout */
243 1024, /* size_addition */
244 5, /* hosts_max_try */
8e669ac1 245 50, /* hosts_max_try_hardlimit */
48c7f9e2 246 TRUE, /* address_retry_include_sender */
0756eb3c 247 FALSE, /* allow_localhost */
382afc6b 248 FALSE, /* authenticated_sender_force */
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249 FALSE, /* gethostbyname */
250 TRUE, /* dns_qualify_single */
251 FALSE, /* dns_search_parents */
0539a19d 252 { NULL, NULL }, /* dnssec_domains {request,require} */
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253 TRUE, /* delay_after_cutoff */
254 FALSE, /* hosts_override */
255 FALSE, /* hosts_randomize */
256 TRUE, /* keepalive */
f1513293 257 FALSE, /* lmtp_ignore_quota */
9c695f6d 258 NULL, /* expand_retry_include_ip_address */
0756eb3c 259 TRUE /* retry_include_ip_address */
f0989ec0 260#ifdef SUPPORT_SOCKS
7eb6c37c 261 ,NULL /* socks_proxy */
b8bf753b 262#endif
80a47a2c 263#ifdef SUPPORT_TLS
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264 ,NULL, /* tls_certificate */
265 NULL, /* tls_crl */
266 NULL, /* tls_privatekey */
267 NULL, /* tls_require_ciphers */
54c90be1 268 NULL, /* tls_sni */
0e0f3f56 269 US"system", /* tls_verify_certificates */
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270 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
271 /* tls_dh_min_bits */
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272 TRUE, /* tls_tempfail_tryclear */
273 NULL, /* tls_verify_hosts */
610ff438 274 US"*", /* tls_try_verify_hosts */
01a4a5c5 275 US"*" /* tls_verify_cert_hostnames */
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276#endif
277#ifndef DISABLE_DKIM
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278 , {NULL, /* dkim_canon */
279 NULL, /* dkim_domain */
280 NULL, /* dkim_private_key */
281 NULL, /* dkim_selector */
282 NULL, /* dkim_sign_headers */
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283 NULL, /* dkim_strict */
284 FALSE} /* dot_stuffed */
80a47a2c 285#endif
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286};
287
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288/* some DSN flags for use later */
289
290static int rf_list[] = {rf_notify_never, rf_notify_success,
291 rf_notify_failure, rf_notify_delay };
292
45500060 293static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
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294
295
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296
297/* Local statics */
298
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299static uschar *smtp_command; /* Points to last cmd for error messages */
300static uschar *mail_command; /* Points to MAIL cmd for error messages */
301static uschar *data_command = US""; /* Points to DATA cmd for error messages */
302static BOOL update_waiting; /* TRUE to update the "wait" database */
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303
304/*XXX move to smtp_context */
87cb4a16 305static BOOL pipelining_active; /* current transaction is in pipe mode */
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306
307
308/*************************************************
309* Setup entry point *
310*************************************************/
311
312/* This function is called when the transport is about to be used,
313but before running it in a sub-process. It is used for two things:
314
315 (1) To set the fallback host list in addresses, when delivering.
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316 (2) To pass back the interface, port, protocol, and other options, for use
317 during callout verification.
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318
319Arguments:
320 tblock pointer to the transport instance block
321 addrlist list of addresses about to be transported
322 tf if not NULL, pointer to block in which to return options
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323 uid the uid that will be set (not used)
324 gid the gid that will be set (not used)
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325 errmsg place for error message (not used)
326
327Returns: OK always (FAIL, DEFER not used)
328*/
329
330static int
331smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 332 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
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333{
334smtp_transport_options_block *ob =
335 (smtp_transport_options_block *)(tblock->options_block);
336
337errmsg = errmsg; /* Keep picky compilers happy */
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338uid = uid;
339gid = gid;
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340
341/* Pass back options if required. This interface is getting very messy. */
342
02b41d71 343if (tf)
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344 {
345 tf->interface = ob->interface;
346 tf->port = ob->port;
347 tf->protocol = ob->protocol;
348 tf->hosts = ob->hosts;
349 tf->hosts_override = ob->hosts_override;
350 tf->hosts_randomize = ob->hosts_randomize;
351 tf->gethostbyname = ob->gethostbyname;
352 tf->qualify_single = ob->dns_qualify_single;
353 tf->search_parents = ob->dns_search_parents;
26da7e20 354 tf->helo_data = ob->helo_data;
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355 }
356
357/* Set the fallback host list for all the addresses that don't have fallback
358host lists, provided that the local host wasn't present in the original host
359list. */
360
361if (!testflag(addrlist, af_local_host_removed))
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362 for (; addrlist; addrlist = addrlist->next)
363 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
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364
365return OK;
366}
367
368
369
370/*************************************************
371* Initialization entry point *
372*************************************************/
373
374/* Called for each instance, after its options have been read, to
375enable consistency checks to be done, or anything else that needs
376to be set up.
377
378Argument: pointer to the transport instance block
379Returns: nothing
380*/
381
382void
383smtp_transport_init(transport_instance *tblock)
384{
385smtp_transport_options_block *ob =
386 (smtp_transport_options_block *)(tblock->options_block);
387
388/* Retry_use_local_part defaults FALSE if unset */
389
390if (tblock->retry_use_local_part == TRUE_UNSET)
391 tblock->retry_use_local_part = FALSE;
392
393/* Set the default port according to the protocol */
394
395if (ob->port == NULL)
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396 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
397 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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398
399/* Set up the setup entry point, to be called before subprocesses for this
400transport. */
401
402tblock->setup = smtp_transport_setup;
403
404/* Complain if any of the timeouts are zero. */
405
406if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
407 ob->final_timeout <= 0)
408 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
409 "command, data, or final timeout value is zero for %s transport",
410 tblock->name);
411
412/* If hosts_override is set and there are local hosts, set the global
413flag that stops verify from showing router hosts. */
414
415if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
416
417/* If there are any fallback hosts listed, build a chain of host items
418for them, but do not do any lookups at this time. */
419
420host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
421}
422
423
424
425
426
427/*************************************************
428* Set delivery info into all active addresses *
429*************************************************/
430
431/* Only addresses whose status is >= PENDING are relevant. A lesser
432status means that an address is not currently being processed.
433
434Arguments:
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435 addrlist points to a chain of addresses
436 errno_value to put in each address's errno field
437 msg to put in each address's message field
438 rc to put in each address's transport_return field
439 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 440 host if set, mark addrs as having used this host
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441 smtp_greeting from peer
442 helo_response from peer
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443
444If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
445the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
446this particular type of timeout.
447
448Returns: nothing
449*/
450
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451static void
452set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
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453 BOOL pass_message, host_item * host
454#ifdef EXPERIMENTAL_DSN_INFO
455 , const uschar * smtp_greeting, const uschar * helo_response
456#endif
457 )
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458{
459address_item *addr;
460int orvalue = 0;
461if (errno_value == ERRNO_CONNECTTIMEOUT)
462 {
463 errno_value = ETIMEDOUT;
464 orvalue = RTEF_CTOUT;
465 }
895fbaf2 466for (addr = addrlist; addr; addr = addr->next)
168dec3b 467 if (addr->transport_return >= PENDING)
447d236c 468 {
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469 addr->basic_errno = errno_value;
470 addr->more_errno |= orvalue;
02b41d71 471 if (msg)
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472 {
473 addr->message = msg;
474 if (pass_message) setflag(addr, af_pass_message);
475 }
476 addr->transport_return = rc;
477 if (host)
895fbaf2 478 {
168dec3b 479 addr->host_used = host;
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480#ifdef EXPERIMENTAL_DSN_INFO
481 if (smtp_greeting)
482 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
483 addr->smtp_greeting = smtp_greeting;
484
485 if (helo_response)
486 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
487 addr->helo_response = helo_response;
488#endif
489 }
447d236c 490 }
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491}
492
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JH
493static void
494set_errno_nohost(address_item *addrlist, int errno_value, uschar *msg, int rc,
495 BOOL pass_message)
496{
497set_errno(addrlist, errno_value, msg, rc, pass_message, NULL
498#ifdef EXPERIMENTAL_DSN_INFO
499 , NULL, NULL
500#endif
501 );
502}
0756eb3c
PH
503
504
505/*************************************************
506* Check an SMTP response *
507*************************************************/
508
509/* This function is given an errno code and the SMTP response buffer
510to analyse, together with the host identification for generating messages. It
511sets an appropriate message and puts the first digit of the response code into
512the yield variable. If no response was actually read, a suitable digit is
513chosen.
514
515Arguments:
447d236c
PH
516 host the current host, to get its name for messages
517 errno_value pointer to the errno value
518 more_errno from the top address for use with ERRNO_FILTER_FAIL
519 buffer the SMTP response buffer
520 yield where to put a one-digit SMTP response code
4c04137d 521 message where to put an error message
447d236c
PH
522 pass_message set TRUE if message is an SMTP response
523
524Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
525*/
526
a7538db1
JH
527static BOOL
528check_response(host_item *host, int *errno_value, int more_errno,
447d236c 529 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c 530{
0d9fa8c0 531uschar * pl = pipelining_active ? US"pipelined " : US"";
e9166683 532const uschar * s;
0756eb3c
PH
533
534*yield = '4'; /* Default setting is to give a temporary error */
535
e9166683 536switch(*errno_value)
0756eb3c 537 {
e9166683
JH
538 case ETIMEDOUT: /* Handle response timeout */
539 *message = US string_sprintf("SMTP timeout after %s%s",
540 pl, smtp_command);
541 if (transport_count > 0)
542 *message = US string_sprintf("%s (%d bytes written)", *message,
543 transport_count);
544 return FALSE;
545
546 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
547 s = string_printing(buffer);
548 while (isspace(*s)) s++;
549 *message = *s == 0
550 ? string_sprintf("Malformed SMTP reply (an empty line) "
551 "in response to %s%s", pl, smtp_command)
552 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
553 pl, smtp_command, s);
554 return FALSE;
555
556 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
557 can't send QUIT as we mustn't end the DATA. */
558 *message = string_sprintf("transport filter process failed (%d)%s",
559 more_errno,
560 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
561 return FALSE;
562
563 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
564 can't send QUIT as we mustn't end the DATA. */
565 *message =
566 string_sprintf("failed to expand headers_add or headers_remove: %s",
567 expand_string_message);
568 return FALSE;
569
570 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
571 *message = string_sprintf("failed to write a data block");
572 return FALSE;
0756eb3c 573
8c5d388a 574#ifdef SUPPORT_I18N
e9166683
JH
575 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
576 *message = US"utf8 support required but not offered for forwarding";
577 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
578 return TRUE;
250b6871 579#endif
e9166683 580 }
250b6871 581
0756eb3c
PH
582/* Handle error responses from the remote mailer. */
583
584if (buffer[0] != 0)
585 {
e9166683
JH
586 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
587 "%s", pl, smtp_command, s = string_printing(buffer));
447d236c 588 *pass_message = TRUE;
0756eb3c
PH
589 *yield = buffer[0];
590 return TRUE;
591 }
592
593/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
594connection closed) case, which causes deferral. An explicit connection reset
595error has the same effect. Otherwise, put the host's identity in the message,
596leaving the errno value to be interpreted as well. In all cases, we have to
597assume the connection is now dead. */
0756eb3c 598
19b9dc85 599if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
600 {
601 *errno_value = ERRNO_SMTPCLOSED;
c562fd30 602 *message = US string_sprintf("Remote host closed connection "
02b41d71 603 "in response to %s%s", pl, smtp_command);
0756eb3c 604 }
de6273b4
JH
605else
606 *message = US string_sprintf("%s [%s]", host->name, host->address);
0756eb3c
PH
607
608return FALSE;
609}
610
611
612
613/*************************************************
614* Write error message to logs *
615*************************************************/
616
617/* This writes to the main log and to the message log.
618
619Arguments:
620 addr the address item containing error information
621 host the current host
622
623Returns: nothing
624*/
625
626static void
627write_logs(address_item *addr, host_item *host)
628{
584ddd64
JH
629uschar * message = LOGGING(outgoing_port)
630 ? string_sprintf("H=%s [%s]:%d", host->name, host->address,
631 host->port == PORT_NONE ? 25 : host->port)
632 : string_sprintf("H=%s [%s]", host->name, host->address);
c562fd30
JH
633
634if (addr->message)
0756eb3c 635 {
c562fd30 636 message = string_sprintf("%s: %s", message, addr->message);
0756eb3c
PH
637 if (addr->basic_errno > 0)
638 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
639 log_write(0, LOG_MAIN, "%s", message);
640 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
641 }
642else
643 {
37f3dc43
JH
644 const uschar * s = exim_errstr(addr->basic_errno);
645 log_write(0, LOG_MAIN, "%s %s", message, s);
646 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, s);
0756eb3c
PH
647 }
648}
649
c562fd30
JH
650static void
651msglog_line(host_item * host, uschar * message)
652{
37f3dc43
JH
653deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
654 host->name, host->address, message);
c562fd30
JH
655}
656
0756eb3c
PH
657
658
0cbf2b82 659#ifndef DISABLE_EVENT
d68218c7
JH
660/*************************************************
661* Post-defer action *
662*************************************************/
663
664/* This expands an arbitrary per-transport string.
665 It might, for example, be used to write to the database log.
666
667Arguments:
d68218c7
JH
668 addr the address item containing error information
669 host the current host
670
671Returns: nothing
672*/
673
674static void
774ef2d7 675deferred_event_raise(address_item *addr, host_item *host)
d68218c7 676{
774ef2d7 677uschar * action = addr->transport->event_action;
55414b25 678const uschar * save_domain;
a7538db1
JH
679uschar * save_local;
680
d68218c7 681if (!action)
a7538db1 682 return;
d68218c7 683
a7538db1
JH
684save_domain = deliver_domain;
685save_local = deliver_localpart;
686
687/*XXX would ip & port already be set up? */
688deliver_host_address = string_copy(host->address);
774ef2d7
JH
689deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
690event_defer_errno = addr->basic_errno;
d68218c7
JH
691
692router_name = addr->router->name;
693transport_name = addr->transport->name;
a7538db1
JH
694deliver_domain = addr->domain;
695deliver_localpart = addr->local_part;
696
774ef2d7 697(void) event_raise(action, US"msg:host:defer",
a7538db1
JH
698 addr->message
699 ? addr->basic_errno > 0
700 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
701 : string_copy(addr->message)
702 : addr->basic_errno > 0
703 ? string_copy(US strerror(addr->basic_errno))
704 : NULL);
705
706deliver_localpart = save_local;
707deliver_domain = save_domain;
d68218c7
JH
708router_name = transport_name = NULL;
709}
710#endif
711
0756eb3c
PH
712/*************************************************
713* Synchronize SMTP responses *
714*************************************************/
715
716/* This function is called from smtp_deliver() to receive SMTP responses from
717the server, and match them up with the commands to which they relate. When
718PIPELINING is not in use, this function is called after every command, and is
719therefore somewhat over-engineered, but it is simpler to use a single scheme
720that works both with and without PIPELINING instead of having two separate sets
721of code.
722
723The set of commands that are buffered up with pipelining may start with MAIL
724and may end with DATA; in between are RCPT commands that correspond to the
725addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
726etc.) are never buffered.
727
728Errors after MAIL or DATA abort the whole process leaving the response in the
729buffer. After MAIL, pending responses are flushed, and the original command is
730re-instated in big_buffer for error messages. For RCPT commands, the remote is
731permitted to reject some recipient addresses while accepting others. However
732certain errors clearly abort the whole process. Set the value in
733transport_return to PENDING_OK if the address is accepted. If there is a
734subsequent general error, it will get reset accordingly. If not, it will get
735converted to OK at the end.
736
737Arguments:
df5b41e3 738 sx smtp connection context
48c7f9e2 739 count the number of responses to read
48c7f9e2
PH
740 pending_DATA 0 if last command sent was not DATA
741 +1 if previously had a good recipient
742 -1 if not previously had a good recipient
0756eb3c
PH
743
744Returns: 3 if at least one address had 2xx and one had 5xx
745 2 if at least one address had 5xx but none had 2xx
746 1 if at least one host had a 2xx response, but none had 5xx
747 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
748 -1 timeout while reading RCPT response
749 -2 I/O or other non-response error for RCPT
750 -3 DATA or MAIL failed - errno and buffer set
751*/
752
753static int
df5b41e3 754sync_responses(smtp_context * sx, int count, int pending_DATA)
0756eb3c 755{
df5b41e3 756address_item *addr = sx->sync_addr;
e9166683
JH
757smtp_transport_options_block *ob =
758 (smtp_transport_options_block *)sx->tblock->options_block;
0756eb3c
PH
759int yield = 0;
760
761/* Handle the response for a MAIL command. On error, reinstate the original
762command in big_buffer for error message use, and flush any further pending
763responses before returning, except after I/O errors and timeouts. */
764
df5b41e3 765if (sx->pending_MAIL)
0756eb3c
PH
766 {
767 count--;
e9166683
JH
768 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
769 '2', ob->command_timeout))
0756eb3c 770 {
e027f545 771 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
0756eb3c 772 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
df5b41e3 773 if (errno == 0 && sx->buffer[0] != 0)
0756eb3c
PH
774 {
775 uschar flushbuffer[4096];
e97957bc 776 int save_errno = 0;
df5b41e3 777 if (sx->buffer[0] == '4')
e97957bc
PH
778 {
779 save_errno = ERRNO_MAIL4XX;
df5b41e3 780 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e97957bc 781 }
0756eb3c
PH
782 while (count-- > 0)
783 {
df5b41e3 784 if (!smtp_read_response(&sx->inblock, flushbuffer, sizeof(flushbuffer),
e9166683 785 '2', ob->command_timeout)
0756eb3c
PH
786 && (errno != 0 || flushbuffer[0] == 0))
787 break;
788 }
e97957bc 789 errno = save_errno;
0756eb3c 790 }
c562fd30
JH
791
792 if (pending_DATA) count--; /* Number of RCPT responses to come */
793 while (count-- > 0) /* Mark any pending addrs with the host used */
794 {
795 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
df5b41e3 796 addr->host_used = sx->host;
c562fd30
JH
797 addr = addr->next;
798 }
0756eb3c
PH
799 return -3;
800 }
801 }
802
803if (pending_DATA) count--; /* Number of RCPT responses to come */
804
805/* Read and handle the required number of RCPT responses, matching each one up
806with an address by scanning for the next address whose status is PENDING_DEFER.
807*/
808
809while (count-- > 0)
810 {
4c2471ca
JH
811 while (addr->transport_return != PENDING_DEFER)
812 if (!(addr = addr->next))
813 return -2;
0756eb3c
PH
814
815 /* The address was accepted */
df5b41e3 816 addr->host_used = sx->host;
0756eb3c 817
e9166683
JH
818 if (smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
819 '2', ob->command_timeout))
0756eb3c
PH
820 {
821 yield |= 1;
822 addr->transport_return = PENDING_OK;
823
824 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
825 ensure that any address-specific retry record is expunged. We do this both
826 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
827
828 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
829 {
830 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
831 sender_address);
832 retry_add_item(addr, altkey, rf_delete);
0756eb3c 833 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 834 }
0756eb3c
PH
835 }
836
837 /* Timeout while reading the response */
838
839 else if (errno == ETIMEDOUT)
840 {
c562fd30 841 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
e9166683 842 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
df5b41e3 843 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE);
0756eb3c 844 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 845 update_waiting = FALSE;
0756eb3c
PH
846 return -1;
847 }
848
849 /* Handle other errors in obtaining an SMTP response by returning -1. This
850 will cause all the addresses to be deferred. Restore the SMTP command in
851 big_buffer for which we are checking the response, so the error message
852 makes sense. */
853
df5b41e3 854 else if (errno != 0 || sx->buffer[0] == 0)
0756eb3c
PH
855 {
856 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
df5b41e3 857 transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes));
0756eb3c
PH
858 return -2;
859 }
860
861 /* Handle SMTP permanent and temporary response codes. */
862
863 else
864 {
865 addr->message =
447d236c 866 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
df5b41e3
JH
867 "%s", transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes),
868 string_printing(sx->buffer));
447d236c 869 setflag(addr, af_pass_message);
e9166683
JH
870 if (!sx->verify)
871 msglog_line(sx->host, addr->message);
0756eb3c
PH
872
873 /* The response was 5xx */
874
df5b41e3 875 if (sx->buffer[0] == '5')
0756eb3c
PH
876 {
877 addr->transport_return = FAIL;
878 yield |= 2;
879 }
880
881 /* The response was 4xx */
882
883 else
884 {
0756eb3c
PH
885 addr->transport_return = DEFER;
886 addr->basic_errno = ERRNO_RCPT4XX;
df5b41e3 887 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
0756eb3c 888
e9166683
JH
889 if (!sx->verify)
890 {
0cbf2b82 891#ifndef DISABLE_EVENT
e9166683
JH
892 event_defer_errno = addr->more_errno;
893 msg_event_raise(US"msg:rcpt:host:defer", addr);
5ef5dd52
JB
894#endif
895
e9166683
JH
896 /* Log temporary errors if there are more hosts to be tried.
897 If not, log this last one in the == line. */
0756eb3c 898
e9166683
JH
899 if (sx->host->next)
900 log_write(0, LOG_MAIN, "H=%s [%s]: %s",
901 sx->host->name, sx->host->address, addr->message);
0756eb3c 902
0cbf2b82 903#ifndef DISABLE_EVENT
e9166683
JH
904 else
905 msg_event_raise(US"msg:rcpt:defer", addr);
5ef5dd52
JB
906#endif
907
e9166683
JH
908 /* Do not put this message on the list of those waiting for specific
909 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 910
e9166683 911 update_waiting = FALSE;
0756eb3c 912
e9166683
JH
913 /* Add a retry item for the address so that it doesn't get tried again
914 too soon. If address_retry_include_sender is true, add the sender address
915 to the retry key. */
0756eb3c 916
e9166683
JH
917 retry_add_item(addr,
918 ob->address_retry_include_sender
919 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
920 : addr->address_retry_key,
921 0);
922 }
0756eb3c
PH
923 }
924 }
925 } /* Loop for next RCPT response */
926
927/* Update where to start at for the next block of responses, unless we
928have already handled all the addresses. */
929
e9166683 930if (addr) sx->sync_addr = addr->next;
0756eb3c
PH
931
932/* Handle a response to DATA. If we have not had any good recipients, either
933previously or in this block, the response is ignored. */
934
935if (pending_DATA != 0 &&
e9166683
JH
936 !smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
937 '3', ob->command_timeout))
0756eb3c
PH
938 {
939 int code;
940 uschar *msg;
447d236c 941 BOOL pass_message;
e97957bc
PH
942 if (pending_DATA > 0 || (yield & 1) != 0)
943 {
df5b41e3 944 if (errno == 0 && sx->buffer[0] == '4')
e97957bc
PH
945 {
946 errno = ERRNO_DATA4XX;
df5b41e3 947 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e97957bc
PH
948 }
949 return -3;
950 }
df5b41e3 951 (void)check_response(sx->host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
0756eb3c
PH
952 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
953 "is in use and there were no good recipients\n", msg);
954 }
955
956/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
957present) received 3xx. If any RCPTs were handled and yielded anything other
958than 4xx, yield will be set non-zero. */
959
960return yield;
961}
962
963
964
fcc8e047
JH
965/* Do the client side of smtp-level authentication */
966/*
967Arguments:
968 buffer EHLO response from server (gets overwritten)
969 addrlist chain of potential addresses to deliver
970 host host to deliver to
971 ob transport options
972 ibp, obp comms channel control blocks
973
974Returns:
975 OK Success, or failed (but not required): global "smtp_authenticated" set
976 DEFER Failed authentication (and was required)
977 ERROR Internal problem
978
979 FAIL_SEND Failed communications - transmit
980 FAIL - response
981*/
982
983int
984smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
985 smtp_transport_options_block *ob, BOOL is_esmtp,
986 smtp_inblock *ibp, smtp_outblock *obp)
987{
a7538db1
JH
988int require_auth;
989uschar *fail_reason = US"server did not advertise AUTH support";
fcc8e047 990
a7538db1
JH
991smtp_authenticated = FALSE;
992client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
5130845b 993require_auth = verify_check_given_host(&ob->hosts_require_auth, host);
fcc8e047 994
a7538db1
JH
995if (is_esmtp && !regex_AUTH) regex_AUTH =
996 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
997 FALSE, TRUE);
fcc8e047 998
a7538db1
JH
999if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
1000 {
1001 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
1002 expand_nmax = -1; /* reset */
fcc8e047 1003
a7538db1
JH
1004 /* Must not do this check until after we have saved the result of the
1005 regex match above. */
fcc8e047 1006
a7538db1 1007 if (require_auth == OK ||
5130845b 1008 verify_check_given_host(&ob->hosts_try_auth, host) == OK)
a7538db1
JH
1009 {
1010 auth_instance *au;
1011 fail_reason = US"no common mechanisms were found";
fcc8e047 1012
a7538db1 1013 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
fcc8e047 1014
a7538db1
JH
1015 /* Scan the configured authenticators looking for one which is configured
1016 for use as a client, which is not suppressed by client_condition, and
1017 whose name matches an authentication mechanism supported by the server.
1018 If one is found, attempt to authenticate by calling its client function.
1019 */
fcc8e047 1020
cab0c277 1021 for (au = auths; !smtp_authenticated && au; au = au->next)
a7538db1
JH
1022 {
1023 uschar *p = names;
1024 if (!au->client ||
1025 (au->client_condition != NULL &&
1026 !expand_check_condition(au->client_condition, au->name,
1027 US"client authenticator")))
1028 {
1029 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1030 au->name,
1031 (au->client)? "client_condition is false" :
1032 "not configured as a client");
1033 continue;
1034 }
fcc8e047 1035
a7538db1 1036 /* Loop to scan supported server mechanisms */
fcc8e047 1037
cab0c277 1038 while (*p)
a7538db1
JH
1039 {
1040 int rc;
1041 int len = Ustrlen(au->public_name);
1042 while (isspace(*p)) p++;
fcc8e047 1043
a7538db1
JH
1044 if (strncmpic(au->public_name, p, len) != 0 ||
1045 (p[len] != 0 && !isspace(p[len])))
1046 {
1047 while (*p != 0 && !isspace(*p)) p++;
1048 continue;
1049 }
fcc8e047 1050
a7538db1
JH
1051 /* Found data for a listed mechanism. Call its client entry. Set
1052 a flag in the outblock so that data is overwritten after sending so
1053 that reflections don't show it. */
fcc8e047 1054
a7538db1
JH
1055 fail_reason = US"authentication attempt(s) failed";
1056 obp->authenticating = TRUE;
1057 rc = (au->info->clientcode)(au, ibp, obp,
1058 ob->command_timeout, buffer, bufsize);
1059 obp->authenticating = FALSE;
1060 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1061 au->name, rc);
fcc8e047 1062
a7538db1
JH
1063 /* A temporary authentication failure must hold up delivery to
1064 this host. After a permanent authentication failure, we carry on
1065 to try other authentication methods. If all fail hard, try to
1066 deliver the message unauthenticated unless require_auth was set. */
fcc8e047 1067
a7538db1
JH
1068 switch(rc)
1069 {
1070 case OK:
1071 smtp_authenticated = TRUE; /* stops the outer loop */
1072 client_authenticator = au->name;
1073 if (au->set_client_id != NULL)
1074 client_authenticated_id = expand_string(au->set_client_id);
1075 break;
1076
1077 /* Failure after writing a command */
1078
1079 case FAIL_SEND:
1080 return FAIL_SEND;
1081
1082 /* Failure after reading a response */
1083
1084 case FAIL:
1085 if (errno != 0 || buffer[0] != '5') return FAIL;
1086 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1087 au->name, host->name, host->address, buffer);
1088 break;
1089
1090 /* Failure by some other means. In effect, the authenticator
1091 decided it wasn't prepared to handle this case. Typically this
1092 is the result of "fail" in an expansion string. Do we need to
1093 log anything here? Feb 2006: a message is now put in the buffer
1094 if logging is required. */
1095
1096 case CANCELLED:
1097 if (*buffer != 0)
1098 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1099 "authentication H=%s [%s] %s", au->name, host->name,
1100 host->address, buffer);
1101 break;
1102
1103 /* Internal problem, message in buffer. */
1104
1105 case ERROR:
895fbaf2
JH
1106 set_errno_nohost(addrlist, ERRNO_AUTHPROB, string_copy(buffer),
1107 DEFER, FALSE);
a7538db1
JH
1108 return ERROR;
1109 }
fcc8e047 1110
a7538db1
JH
1111 break; /* If not authenticated, try next authenticator */
1112 } /* Loop for scanning supported server mechanisms */
1113 } /* Loop for further authenticators */
fcc8e047 1114 }
a7538db1 1115 }
fcc8e047 1116
a7538db1 1117/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1118
a7538db1
JH
1119if (require_auth == OK && !smtp_authenticated)
1120 {
895fbaf2 1121 set_errno_nohost(addrlist, ERRNO_AUTHFAIL,
a7538db1 1122 string_sprintf("authentication required but %s", fail_reason), DEFER,
895fbaf2 1123 FALSE);
a7538db1
JH
1124 return DEFER;
1125 }
4d8d62b9 1126
a7538db1 1127return OK;
fcc8e047
JH
1128}
1129
1130
1131/* Construct AUTH appendix string for MAIL TO */
1132/*
1133Arguments
1134 buffer to build string
1135 addrlist chain of potential addresses to deliver
1136 ob transport options
1137
1138Globals smtp_authenticated
1139 client_authenticated_sender
1140Return True on error, otherwise buffer has (possibly empty) terminated string
1141*/
1142
1143BOOL
1144smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1145 smtp_transport_options_block *ob)
1146{
1147uschar *local_authenticated_sender = authenticated_sender;
1148
1149#ifdef notdef
1150 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1151#endif
1152
1153if (ob->authenticated_sender != NULL)
1154 {
1155 uschar *new = expand_string(ob->authenticated_sender);
1156 if (new == NULL)
1157 {
1158 if (!expand_string_forcedfail)
1159 {
1160 uschar *message = string_sprintf("failed to expand "
1161 "authenticated_sender: %s", expand_string_message);
895fbaf2 1162 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
fcc8e047
JH
1163 return TRUE;
1164 }
1165 }
1166 else if (new[0] != 0) local_authenticated_sender = new;
1167 }
1168
1169/* Add the authenticated sender address if present */
1170
1171if ((smtp_authenticated || ob->authenticated_sender_force) &&
1172 local_authenticated_sender != NULL)
1173 {
1174 string_format(buffer, bufsize, " AUTH=%s",
1175 auth_xtextencode(local_authenticated_sender,
1176 Ustrlen(local_authenticated_sender)));
1177 client_authenticated_sender = string_copy(local_authenticated_sender);
1178 }
1179else
1180 *buffer= 0;
1181
1182return FALSE;
1183}
1184
1185
1186
0e66b3b6 1187#ifdef EXPERIMENTAL_DANE
2d5fdd53
JH
1188/* Lookup TLSA record for host/port.
1189Return: OK success with dnssec; DANE mode
1190 DEFER Do not use this host now, may retry later
1191 FAIL_FORCED No TLSA record; DANE not usable
1192 FAIL Do not use this connection
1193*/
1194
0e66b3b6 1195int
4b0fe319 1196tlsa_lookup(const host_item * host, dns_answer * dnsa, BOOL dane_required)
0e66b3b6
JH
1197{
1198/* move this out to host.c given the similarity to dns_lookup() ? */
1199uschar buffer[300];
55414b25 1200const uschar * fullname = buffer;
58c30e47
JH
1201int rc;
1202BOOL sec;
0e66b3b6
JH
1203
1204/* TLSA lookup string */
1205(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
1206
58c30e47
JH
1207rc = dns_lookup(dnsa, buffer, T_TLSA, &fullname);
1208sec = dns_is_secure(dnsa);
1209DEBUG(D_transport)
1210 debug_printf("TLSA lookup ret %d %sDNSSEC\n", rc, sec ? "" : "not ");
1211
1212switch (rc)
0e66b3b6 1213 {
0e66b3b6 1214 case DNS_SUCCEED:
58c30e47 1215 if (sec) return OK;
2d5fdd53 1216
58c30e47
JH
1217 log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
1218 /*FALLTHROUGH*/
2d5fdd53
JH
1219 case DNS_AGAIN:
1220 return DEFER; /* just defer this TLS'd conn */
1221
ef3a1a30
JH
1222 case DNS_NODATA: /* no TLSA RR for this lookup */
1223 case DNS_NOMATCH: /* no records at all for this lookup */
6b524204 1224 return dane_required ? FAIL : FAIL_FORCED;
2d5fdd53
JH
1225
1226 default:
1227 case DNS_FAIL:
1228 return dane_required ? FAIL : DEFER;
0e66b3b6 1229 }
0e66b3b6
JH
1230}
1231#endif
1232
1233
a39bd74d
JB
1234
1235typedef struct smtp_compare_s
1236{
1237 uschar *current_sender_address;
1238 struct transport_instance *tblock;
1239} smtp_compare_t;
1240
d093f8e5
JH
1241
1242/* Create a unique string that identifies this message, it is based on
1243sender_address, helo_data and tls_certificate if enabled.
1244*/
a39bd74d
JB
1245
1246static uschar *
1247smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1248{
1249address_item * addr1;
1250uschar * if1 = US"";
1251uschar * helo1 = US"";
1252#ifdef SUPPORT_TLS
1253uschar * tlsc1 = US"";
1254#endif
1255uschar * save_sender_address = sender_address;
1256uschar * local_identity = NULL;
1257smtp_transport_options_block * ob =
1258 (smtp_transport_options_block *)tblock->options_block;
1259
1260sender_address = sender;
1261
1262addr1 = deliver_make_addr (sender, TRUE);
1263deliver_set_expansions(addr1);
1264
1265if (ob->interface)
1266 if1 = expand_string(ob->interface);
1267
1268if (ob->helo_data)
1269 helo1 = expand_string(ob->helo_data);
1270
1271#ifdef SUPPORT_TLS
1272if (ob->tls_certificate)
1273 tlsc1 = expand_string(ob->tls_certificate);
1274local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1275#else
1276local_identity = string_sprintf ("%s^%s", if1, helo1);
1277#endif
1278
1279deliver_set_expansions(NULL);
1280sender_address = save_sender_address;
1281
1282return local_identity;
1283}
1284
1285
1286
1287/* This routine is a callback that is called from transport_check_waiting.
1288This function will evaluate the incoming message versus the previous
1289message. If the incoming message is using a different local identity then
1290we will veto this new message. */
1291
1292static BOOL
1293smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1294{
dadff1d4
HSHR
1295uschar * message_local_identity,
1296 * current_local_identity,
1297 * new_sender_address;
1298
1299current_local_identity =
a39bd74d 1300 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1301
dadff1d4
HSHR
1302if (!(new_sender_address = deliver_get_sender_address(message_id)))
1303 return 0;
1304
1305message_local_identity =
1306 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1307
1308return Ustrcmp(current_local_identity, message_local_identity) == 0;
1309}
1310
1311
1312
e9166683
JH
1313static uschar
1314ehlo_response(uschar * buf, uschar checks)
9094b84b 1315{
e9166683
JH
1316size_t bsize = Ustrlen(buf);
1317
9094b84b 1318#ifdef SUPPORT_TLS
14de8063 1319if ( checks & OPTION_TLS
ff5aac2b 1320 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1321 checks &= ~OPTION_TLS;
9094b84b
JH
1322#endif
1323
14de8063 1324if ( checks & OPTION_IGNQ
ff5aac2b
JH
1325 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1326 PCRE_EOPT, NULL, 0) < 0)
14de8063 1327 checks &= ~OPTION_IGNQ;
9094b84b 1328
14de8063 1329if ( checks & OPTION_CHUNKING
f98442df 1330 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1331 checks &= ~OPTION_CHUNKING;
f98442df 1332
9094b84b 1333#ifndef DISABLE_PRDR
14de8063 1334if ( checks & OPTION_PRDR
ff5aac2b 1335 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1336 checks &= ~OPTION_PRDR;
9094b84b
JH
1337#endif
1338
1339#ifdef SUPPORT_I18N
14de8063 1340if ( checks & OPTION_UTF8
ff5aac2b 1341 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1342 checks &= ~OPTION_UTF8;
9094b84b
JH
1343#endif
1344
14de8063 1345if ( checks & OPTION_DSN
ff5aac2b 1346 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1347 checks &= ~OPTION_DSN;
9094b84b 1348
14de8063 1349if ( checks & OPTION_PIPE
ff5aac2b
JH
1350 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1351 PCRE_EOPT, NULL, 0) < 0)
14de8063 1352 checks &= ~OPTION_PIPE;
9094b84b 1353
14de8063 1354if ( checks & OPTION_SIZE
ff5aac2b 1355 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1356 checks &= ~OPTION_SIZE;
9094b84b
JH
1357
1358return checks;
1359}
1360
1361
6d5c916c
JH
1362
1363/* Callback for emitting a BDAT data chunk header.
6d5c916c 1364
e027f545
JH
1365If given a nonzero size, first flush any buffered SMTP commands
1366then emit the command.
1367
d2aa036b
JH
1368Reap previous SMTP command responses if requested, and always reap
1369the response from a previous BDAT command.
1370
1371Args:
1372 tctx transport context
1373 chunk_size value for SMTP BDAT command
1374 flags
1375 tc_chunk_last add LAST option to SMTP BDAT command
1376 tc_reap_prev reap response to previous SMTP commands
6d5c916c
JH
1377
1378Returns: OK or ERROR
1379*/
1380
1381static int
d2aa036b
JH
1382smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1383 unsigned flags)
6d5c916c
JH
1384{
1385smtp_transport_options_block * ob =
1386 (smtp_transport_options_block *)(tctx->tblock->options_block);
e9166683 1387smtp_context * sx = tctx->smtp_context;
e027f545
JH
1388int cmd_count = 0;
1389int prev_cmd_count;
6d5c916c 1390
4e910c01
JH
1391/* Write SMTP chunk header command. If not reaping responses, note that
1392there may be more writes (like, the chunk data) done soon. */
6d5c916c 1393
e027f545 1394if (chunk_size > 0)
87cb4a16 1395 {
4e910c01
JH
1396 if((cmd_count = smtp_write_command(&sx->outblock,
1397 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1398 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
e027f545 1399 ) < 0) return ERROR;
87cb4a16
JH
1400 if (flags & tc_chunk_last)
1401 data_command = string_copy(big_buffer); /* Save for later error message */
1402 }
e027f545 1403
e9166683 1404prev_cmd_count = cmd_count += sx->cmd_count;
6d5c916c 1405
e027f545 1406/* Reap responses for any previous, but not one we just emitted */
6d5c916c 1407
e027f545
JH
1408if (chunk_size > 0)
1409 prev_cmd_count--;
e9166683 1410if (sx->pending_BDAT)
e027f545 1411 prev_cmd_count--;
6d5c916c 1412
e027f545 1413if (flags & tc_reap_prev && prev_cmd_count > 0)
6d5c916c 1414 {
58fc5fb2
JH
1415 DEBUG(D_transport) debug_printf("look for %d responses"
1416 " for previous pipelined cmds\n", prev_cmd_count);
6d5c916c 1417
e9166683 1418 switch(sync_responses(sx, prev_cmd_count, 0))
e027f545
JH
1419 {
1420 case 1: /* 2xx (only) => OK */
e9166683
JH
1421 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1422 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
e027f545
JH
1423 case 0: break; /* No 2xx or 5xx, but no probs */
1424
1425 case -1: /* Timeout on RCPT */
1426 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1427 }
1428 cmd_count = 1;
e9166683 1429 if (!sx->pending_BDAT)
e027f545 1430 pipelining_active = FALSE;
6d5c916c 1431 }
e027f545 1432
58fc5fb2 1433/* Reap response for an outstanding BDAT */
e027f545 1434
e9166683 1435if (sx->pending_BDAT)
e027f545 1436 {
58fc5fb2
JH
1437 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1438
e9166683 1439 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
e027f545
JH
1440 ob->command_timeout))
1441 {
e9166683 1442 if (errno == 0 && sx->buffer[0] == '4')
e027f545
JH
1443 {
1444 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
36e55f49 1445 sx->addrlist->more_errno |=
e9166683 1446 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e027f545
JH
1447 }
1448 return ERROR;
1449 }
1450 cmd_count--;
e9166683 1451 sx->pending_BDAT = FALSE;
e027f545
JH
1452 pipelining_active = FALSE;
1453 }
1454else if (chunk_size > 0)
e9166683 1455 sx->pending_BDAT = TRUE;
e027f545
JH
1456
1457
e9166683 1458sx->cmd_count = cmd_count;
e027f545 1459return OK;
6d5c916c
JH
1460}
1461
1462
1463
0756eb3c 1464/*************************************************
d093f8e5 1465* Make connection for given message *
0756eb3c
PH
1466*************************************************/
1467
d093f8e5
JH
1468/*
1469Arguments:
1470 ctx connection context
d093f8e5
JH
1471 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1472 a second attempt after TLS initialization fails
d093f8e5
JH
1473
1474Returns: OK - the connection was made and the delivery attempted;
1475 fd is set in the conn context, tls_out set up.
1476 DEFER - the connection could not be made, or something failed
1477 while setting up the SMTP session, or there was a
1478 non-message-specific error, such as a timeout.
1479 ERROR - helo_data or add_headers or authenticated_sender is
1480 specified for this transport, and the string failed
1481 to expand
1482*/
1483int
e9166683 1484smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
d093f8e5
JH
1485{
1486#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
1487dns_answer tlsa_dnsa;
1488#endif
1489BOOL pass_message = FALSE;
d093f8e5 1490uschar * message = NULL;
d093f8e5
JH
1491int yield = OK;
1492int rc;
1493
02b41d71 1494sx->ob = (smtp_transport_options_block *) sx->tblock->options_block;
d093f8e5
JH
1495
1496sx->lmtp = strcmpic(sx->ob->protocol, US"lmtp") == 0;
1497sx->smtps = strcmpic(sx->ob->protocol, US"smtps") == 0;
1498sx->ok = FALSE;
1499sx->send_rset = TRUE;
1500sx->send_quit = TRUE;
1501sx->setting_up = TRUE;
1502sx->esmtp = TRUE;
1503sx->esmtp_sent = FALSE;
59a286ef 1504#ifdef SUPPORT_I18N
d093f8e5 1505sx->utf8_needed = FALSE;
59a286ef 1506#endif
d093f8e5 1507sx->dsn_all_lasthop = TRUE;
59a286ef 1508#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
d093f8e5
JH
1509sx->dane = FALSE;
1510sx->dane_required = verify_check_given_host(&sx->ob->hosts_require_dane, sx->host) == OK;
1511#endif
1512
1513if ((sx->max_rcpt = sx->tblock->max_addresses) == 0) sx->max_rcpt = 999999;
d093f8e5 1514sx->peer_offered = 0;
14de8063 1515sx->avoid_option = 0;
d093f8e5 1516sx->igquotstr = US"";
02b41d71 1517if (!sx->helo_data) sx->helo_data = sx->ob->helo_data;
d093f8e5
JH
1518#ifdef EXPERIMENTAL_DSN_INFO
1519sx->smtp_greeting = NULL;
1520sx->helo_response = NULL;
59a286ef
JH
1521#endif
1522
0756eb3c 1523smtp_command = US"initial connection";
d093f8e5 1524sx->buffer[0] = '\0';
0756eb3c
PH
1525
1526/* Set up the buffer for reading SMTP response packets. */
1527
d093f8e5
JH
1528sx->inblock.buffer = sx->inbuffer;
1529sx->inblock.buffersize = sizeof(sx->inbuffer);
1530sx->inblock.ptr = sx->inbuffer;
1531sx->inblock.ptrend = sx->inbuffer;
0756eb3c
PH
1532
1533/* Set up the buffer for holding SMTP commands while pipelining */
1534
d093f8e5
JH
1535sx->outblock.buffer = sx->outbuffer;
1536sx->outblock.buffersize = sizeof(sx->outbuffer);
1537sx->outblock.ptr = sx->outbuffer;
1538sx->outblock.cmd_count = 0;
1539sx->outblock.authenticating = FALSE;
0756eb3c 1540
6c512171
PH
1541/* Reset the parameters of a TLS session. */
1542
817d9f57
JH
1543tls_out.bits = 0;
1544tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1545tls_out.ourcert = NULL;
1546tls_out.peercert = NULL;
817d9f57
JH
1547tls_out.peerdn = NULL;
1548#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1549tls_out.sni = NULL;
5b456975 1550#endif
018058b2 1551tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1552
35aba663
JH
1553/* Flip the legacy TLS-related variables over to the outbound set in case
1554they're used in the context of the transport. Don't bother resetting
02b41d71
JH
1555afterward (when being used by a transport) as we're in a subprocess.
1556For verify, unflipped once the callout is dealt with */
35aba663
JH
1557
1558tls_modify_variables(&tls_out);
1559
061b7ebd 1560#ifndef SUPPORT_TLS
d093f8e5 1561if (sx->smtps)
061b7ebd 1562 {
d093f8e5 1563 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
895fbaf2 1564 DEFER, FALSE);
018058b2 1565 return ERROR;
061b7ebd
PP
1566 }
1567#endif
1568
0756eb3c
PH
1569/* Make a connection to the host if this isn't a continued delivery, and handle
1570the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1571specially so they can be identified for retries. */
1572
58c30e47 1573if (!continue_hostname)
0756eb3c 1574 {
e9166683 1575 if (sx->verify)
02b41d71
JH
1576 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->interface, sx->port);
1577
58c30e47 1578 /* Get the actual port the connection will use, into sx->host */
4311097e 1579
58c30e47 1580 smtp_port_for_connect(sx->host, sx->port);
0756eb3c 1581
0e66b3b6 1582#if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
58c30e47 1583 /* Do TLSA lookup for DANE */
0e66b3b6 1584 {
0e66b3b6
JH
1585 tls_out.dane_verified = FALSE;
1586 tls_out.tlsa_usage = 0;
1587
d093f8e5 1588 if (sx->host->dnssec == DS_YES)
0e66b3b6 1589 {
d093f8e5
JH
1590 if( sx->dane_required
1591 || verify_check_given_host(&sx->ob->hosts_try_dane, sx->host) == OK
0e66b3b6 1592 )
d093f8e5 1593 switch (rc = tlsa_lookup(sx->host, &tlsa_dnsa, sx->dane_required))
4b0fe319 1594 {
58c30e47
JH
1595 case OK: sx->dane = TRUE;
1596 sx->ob->tls_tempfail_tryclear = FALSE;
1597 break;
2d5fdd53 1598 case FAIL_FORCED: break;
d093f8e5 1599 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2d5fdd53
JH
1600 string_sprintf("DANE error: tlsa lookup %s",
1601 rc == DEFER ? "DEFER" : "FAIL"),
1602 rc, FALSE);
1603 return rc;
4b0fe319 1604 }
0e66b3b6 1605 }
d093f8e5 1606 else if (sx->dane_required)
0e66b3b6 1607 {
d093f8e5
JH
1608 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
1609 string_sprintf("DANE error: %s lookup not DNSSEC", sx->host->name),
895fbaf2 1610 FAIL, FALSE);
4b0fe319 1611 return FAIL;
0e66b3b6 1612 }
0e66b3b6
JH
1613 }
1614#endif /*DANE*/
1615
58c30e47
JH
1616 /* Make the TCP connection */
1617
1618 sx->inblock.sock = sx->outblock.sock =
1619 smtp_connect(sx->host, sx->host_af, sx->interface,
1620 sx->ob->connect_timeout, sx->tblock);
1621
1622 if (sx->inblock.sock < 0)
1623 {
1624 uschar * msg = NULL;
1625 if (sx->verify)
1626 {
1627 msg = US strerror(errno);
1628 HDEBUG(D_verify) debug_printf("connect: %s\n", msg);
1629 }
1630 set_errno_nohost(sx->addrlist,
1631 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
1632 sx->verify ? string_sprintf("could not connect: %s", msg)
1633 : NULL,
1634 DEFER, FALSE);
1635 sx->send_quit = FALSE;
1636 return DEFER;
1637 }
1638
41c7c167
PH
1639 /* Expand the greeting message while waiting for the initial response. (Makes
1640 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1641 delayed till here so that $sending_interface and $sending_port are set. */
1642
02b41d71
JH
1643 if (sx->helo_data)
1644 if (!(sx->helo_data = expand_string(sx->helo_data)))
e9166683 1645 if (sx->verify)
02b41d71
JH
1646 log_write(0, LOG_MAIN|LOG_PANIC,
1647 "<%s>: failed to expand transport's helo_data value for callout: %s",
1648 sx->addrlist->address, expand_string_message);
1649
8c5d388a 1650#ifdef SUPPORT_I18N
d093f8e5 1651 if (sx->helo_data)
810d16ad 1652 {
02b41d71
JH
1653 expand_string_message = NULL;
1654 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
1655 &expand_string_message)),
1656 expand_string_message)
e9166683 1657 if (sx->verify)
02b41d71
JH
1658 log_write(0, LOG_MAIN|LOG_PANIC,
1659 "<%s>: failed to expand transport's helo_data value for callout: %s",
1660 sx->addrlist->address, expand_string_message);
1661 else
1662 sx->helo_data = NULL;
810d16ad
JH
1663 }
1664#endif
41c7c167 1665
0756eb3c
PH
1666 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1667 is nevertheless a reasonably clean way of programming this kind of logic,
1668 where you want to escape on any error. */
1669
d093f8e5 1670 if (!sx->smtps)
061b7ebd 1671 {
8d330698
JH
1672 BOOL good_response;
1673
1674#ifdef TCP_QUICKACK
d093f8e5 1675 (void) setsockopt(sx->inblock.sock, IPPROTO_TCP, TCP_QUICKACK, US &off, sizeof(off));
8d330698 1676#endif
d093f8e5
JH
1677 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1678 '2', sx->ob->command_timeout);
895fbaf2 1679#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1680 sx->smtp_greeting = string_copy(sx->buffer);
895fbaf2
JH
1681#endif
1682 if (!good_response) goto RESPONSE_FAILED;
0756eb3c 1683
0cbf2b82 1684#ifndef DISABLE_EVENT
b30275b8 1685 {
805c9d53 1686 uschar * s;
d093f8e5
JH
1687 lookup_dnssec_authenticated = sx->host->dnssec==DS_YES ? US"yes"
1688 : sx->host->dnssec==DS_NO ? US"no" : NULL;
1689 s = event_raise(sx->tblock->event_action, US"smtp:connect", sx->buffer);
b30275b8 1690 if (s)
a7538db1 1691 {
d093f8e5 1692 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
b30275b8 1693 string_sprintf("deferred by smtp:connect event expansion: %s", s),
895fbaf2 1694 DEFER, FALSE);
a7538db1
JH
1695 yield = DEFER;
1696 goto SEND_QUIT;
1697 }
b30275b8 1698 }
a7538db1
JH
1699#endif
1700
061b7ebd
PP
1701 /* Now check if the helo_data expansion went well, and sign off cleanly if
1702 it didn't. */
41c7c167 1703
d093f8e5 1704 if (!sx->helo_data)
061b7ebd 1705 {
d093f8e5 1706 message = string_sprintf("failed to expand helo_data: %s",
061b7ebd 1707 expand_string_message);
d093f8e5 1708 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
061b7ebd
PP
1709 yield = DEFER;
1710 goto SEND_QUIT;
1711 }
41c7c167
PH
1712 }
1713
0756eb3c 1714/** Debugging without sending a message
d093f8e5 1715sx->addrlist->transport_return = DEFER;
0756eb3c
PH
1716goto SEND_QUIT;
1717**/
1718
1719 /* Errors that occur after this point follow an SMTP command, which is
1720 left in big_buffer by smtp_write_command() for use in error messages. */
1721
1722 smtp_command = big_buffer;
1723
1724 /* Tell the remote who we are...
1725
1726 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1727 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1728 greeting is of this form. The assumption was that the far end supports it
1729 properly... but experience shows that there are some that give 5xx responses,
1730 even though the banner includes "ESMTP" (there's a bloody-minded one that
1731 says "ESMTP not spoken here"). Cope with that case.
1732
1733 September 2000: Time has passed, and it seems reasonable now to always send
1734 EHLO at the start. It is also convenient to make the change while installing
1735 the TLS stuff.
1736
1737 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1738 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1739 would be no way to send out the mails, so there is now a host list
1740 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1741 PIPELINING problem as well. Maybe it can also be useful to cure other
1742 problems with broken servers.
1743
1744 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1745 Then somebody tried it with a Microsoft mailer... It seems that all other
1746 mailers use upper case for some reason (the RFC is quite clear about case
1747 independence) so, for peace of mind, I gave in. */
1748
d093f8e5 1749 sx->esmtp = verify_check_given_host(&sx->ob->hosts_avoid_esmtp, sx->host) != OK;
0756eb3c 1750
061b7ebd
PP
1751 /* Alas; be careful, since this goto is not an error-out, so conceivably
1752 we might set data between here and the target which we assume to exist
1753 and be usable. I can see this coming back to bite us. */
a7538db1 1754#ifdef SUPPORT_TLS
d093f8e5 1755 if (sx->smtps)
061b7ebd 1756 {
14de8063 1757 smtp_peer_options |= OPTION_TLS;
061b7ebd 1758 suppress_tls = FALSE;
d093f8e5 1759 sx->ob->tls_tempfail_tryclear = FALSE;
061b7ebd
PP
1760 smtp_command = US"SSL-on-connect";
1761 goto TLS_NEGOTIATE;
1762 }
a7538db1 1763#endif
061b7ebd 1764
d093f8e5 1765 if (sx->esmtp)
0756eb3c 1766 {
4e910c01 1767 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
d093f8e5 1768 sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
0756eb3c 1769 goto SEND_FAILED;
d093f8e5
JH
1770 sx->esmtp_sent = TRUE;
1771 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
1772 sx->ob->command_timeout))
0756eb3c 1773 {
d093f8e5 1774 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
895fbaf2
JH
1775 {
1776#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1777 sx->helo_response = string_copy(sx->buffer);
895fbaf2
JH
1778#endif
1779 goto RESPONSE_FAILED;
1780 }
d093f8e5 1781 sx->esmtp = FALSE;
0756eb3c 1782 }
895fbaf2 1783#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1784 sx->helo_response = string_copy(sx->buffer);
895fbaf2 1785#endif
0756eb3c
PH
1786 }
1787 else
0756eb3c
PH
1788 DEBUG(D_transport)
1789 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
0756eb3c 1790
d093f8e5 1791 if (!sx->esmtp)
0756eb3c 1792 {
895fbaf2 1793 BOOL good_response;
d093f8e5
JH
1794 int n = sizeof(sx->buffer);
1795 uschar * rsp = sx->buffer;
a57ce043 1796
d093f8e5
JH
1797 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
1798 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
895fbaf2 1799
4e910c01 1800 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
0756eb3c 1801 goto SEND_FAILED;
d093f8e5
JH
1802 good_response = smtp_read_response(&sx->inblock, rsp, n,
1803 '2', sx->ob->command_timeout);
895fbaf2 1804#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 1805 sx->helo_response = string_copy(rsp);
895fbaf2 1806#endif
a57ce043
JH
1807 if (!good_response)
1808 {
1809 /* Handle special logging for a closed connection after HELO
1810 when had previously sent EHLO */
1811
d093f8e5 1812 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
a57ce043 1813 {
de6273b4
JH
1814 errno = ERRNO_SMTPCLOSED;
1815 goto EHLOHELO_FAILED;
a57ce043 1816 }
d093f8e5 1817 Ustrncpy(sx->buffer, rsp, sizeof(sx->buffer)/2);
a57ce043
JH
1818 goto RESPONSE_FAILED;
1819 }
0756eb3c
PH
1820 }
1821
14de8063 1822 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
2d14f397 1823
d093f8e5 1824 if (sx->esmtp || sx->lmtp)
2d14f397 1825 {
e9166683 1826 sx->peer_offered = ehlo_response(sx->buffer,
14de8063 1827 OPTION_TLS /* others checked later */
9094b84b 1828 );
f1513293 1829
0756eb3c
PH
1830 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1831
a7538db1 1832#ifdef SUPPORT_TLS
14de8063 1833 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
7ade712c 1834#endif
2d14f397 1835 }
0756eb3c
PH
1836 }
1837
57cc2785
JH
1838/* For continuing deliveries down the same channel, having re-exec'd the socket
1839is the standard input; for a socket held open from verify it is recorded
1840in the cutthrough context block. Either way we don't need to redo EHLO here
1841(but may need to do so for TLS - see below).
1842Set up the pointer to where subsequent commands will be left, for
2d14f397 1843error messages. Note that smtp_peer_options will have been
0756eb3c
PH
1844set from the command line if they were set in the process that passed the
1845connection on. */
1846
895fbaf2 1847/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
4c04137d 1848as the continue goes via transport_pass_socket() and doublefork and exec.
895fbaf2
JH
1849It does not wait. Unclear how we keep separate host's responses
1850separate - we could match up by host ip+port as a bodge. */
1851
0756eb3c
PH
1852else
1853 {
57cc2785
JH
1854 if (cutthrough.fd >= 0 && cutthrough.callout_hold_only)
1855 {
1856 sx->inblock.sock = sx->outblock.sock = cutthrough.fd;
1857 sx->host->port = sx->port = cutthrough.host.port;
1858 }
1859 else
1860 {
1861 sx->inblock.sock = sx->outblock.sock = 0; /* stdin */
a843a57e 1862 smtp_port_for_connect(sx->host, sx->port); /* Record the port that was used */
57cc2785 1863 }
0756eb3c 1864 smtp_command = big_buffer;
02b41d71 1865 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
875512a3 1866
57cc2785
JH
1867 /* For a continued connection with TLS being proxied for us, or a
1868 held-open verify connection with TLS, nothing more to do. */
875512a3 1869
57cc2785
JH
1870 if ( continue_proxy_cipher
1871 || (cutthrough.fd >= 0 && cutthrough.callout_hold_only && cutthrough.is_tls)
1872 )
875512a3
JH
1873 {
1874 sx->peer_offered = smtp_peer_options;
14de8063 1875 pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
57cc2785
JH
1876 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
1877 continue_proxy_cipher ? "proxied" : "verify conn with");
875512a3
JH
1878 return OK;
1879 }
1880 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
0756eb3c
PH
1881 }
1882
1883/* If TLS is available on this connection, whether continued or not, attempt to
1884start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1885send another EHLO - the server may give a different answer in secure mode. We
1886use a separate buffer for reading the response to STARTTLS so that if it is
1887negative, the original EHLO data is available for subsequent analysis, should
1888the client not be required to use TLS. If the response is bad, copy the buffer
1889for error analysis. */
1890
1891#ifdef SUPPORT_TLS
14de8063 1892if ( smtp_peer_options & OPTION_TLS
5130845b 1893 && !suppress_tls
02b41d71 1894 && verify_check_given_host(&sx->ob->hosts_avoid_tls, sx->host) != OK
e9166683 1895 && ( !sx->verify
02b41d71
JH
1896 || verify_check_given_host(&sx->ob->hosts_verify_avoid_tls, sx->host) != OK
1897 ) )
0756eb3c
PH
1898 {
1899 uschar buffer2[4096];
4e910c01 1900 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "STARTTLS\r\n") < 0)
0756eb3c
PH
1901 goto SEND_FAILED;
1902
1903 /* If there is an I/O error, transmission of this message is deferred. If
1904 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1905 false, we also defer. However, if there is a temporary rejection of STARTTLS
1906 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1907 STARTTLS, we carry on. This means we will try to send the message in clear,
1908 unless the host is in hosts_require_tls (tested below). */
1909
d093f8e5
JH
1910 if (!smtp_read_response(&sx->inblock, buffer2, sizeof(buffer2), '2',
1911 sx->ob->command_timeout))
0756eb3c 1912 {
4b0fe319
JH
1913 if ( errno != 0
1914 || buffer2[0] == 0
d093f8e5 1915 || (buffer2[0] == '4' && !sx->ob->tls_tempfail_tryclear)
4b0fe319 1916 )
0dda4340 1917 {
d093f8e5 1918 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
9e7e0f6a 1919 sx->buffer[sizeof(sx->buffer)-1] = '\0';
0756eb3c 1920 goto RESPONSE_FAILED;
0dda4340 1921 }
0756eb3c
PH
1922 }
1923
1924 /* STARTTLS accepted: try to negotiate a TLS session. */
1925
1926 else
061b7ebd 1927 TLS_NEGOTIATE:
0756eb3c 1928 {
d093f8e5 1929 address_item * addr;
cf0c6164
JH
1930 uschar * errstr;
1931 int rc = tls_client_start(sx->inblock.sock, sx->host, sx->addrlist, sx->tblock,
0e66b3b6 1932# ifdef EXPERIMENTAL_DANE
cf0c6164 1933 sx->dane ? &tlsa_dnsa : NULL,
0e66b3b6 1934# endif
cf0c6164 1935 &errstr);
0756eb3c
PH
1936
1937 /* TLS negotiation failed; give an error. From outside, this function may
1938 be called again to try in clear on a new connection, if the options permit
1939 it for this host. */
1940
1941 if (rc != OK)
1942 {
6ebd79ec 1943# ifdef EXPERIMENTAL_DANE
d093f8e5 1944 if (sx->dane) log_write(0, LOG_MAIN,
cf0c6164
JH
1945 "DANE attempt failed; TLS connection to %s [%s]: %s",
1946 sx->host->name, sx->host->address, errstr);
6ebd79ec
JH
1947# endif
1948
de6273b4 1949 errno = ERRNO_TLSFAILURE;
cf0c6164 1950 message = string_sprintf("TLS session: %s", errstr);
d093f8e5 1951 sx->send_quit = FALSE;
0756eb3c
PH
1952 goto TLS_FAILED;
1953 }
1954
1955 /* TLS session is set up */
1956
2d14f397 1957 smtp_peer_options_wrap = smtp_peer_options;
d093f8e5 1958 for (addr = sx->addrlist; addr; addr = addr->next)
5ca2a9a1
PH
1959 if (addr->transport_return == PENDING_DEFER)
1960 {
817d9f57 1961 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1962 addr->ourcert = tls_out.ourcert;
1963 addr->peercert = tls_out.peercert;
817d9f57 1964 addr->peerdn = tls_out.peerdn;
018058b2 1965 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1966 }
0756eb3c
PH
1967 }
1968 }
1969
061b7ebd
PP
1970/* if smtps, we'll have smtp_command set to something else; always safe to
1971reset it here. */
1972smtp_command = big_buffer;
1973
41c7c167
PH
1974/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1975helo_data is null, we are dealing with a connection that was passed from
1976another process, and so we won't have expanded helo_data above. We have to
1977expand it here. $sending_ip_address and $sending_port are set up right at the
1978start of the Exim process (in exim.c). */
0756eb3c 1979
817d9f57 1980if (tls_out.active >= 0)
0756eb3c 1981 {
061b7ebd 1982 char *greeting_cmd;
895fbaf2
JH
1983 BOOL good_response;
1984
d093f8e5 1985 if (!sx->helo_data && !(sx->helo_data = expand_string(sx->ob->helo_data)))
41c7c167 1986 {
d093f8e5
JH
1987 uschar *message = string_sprintf("failed to expand helo_data: %s",
1988 expand_string_message);
1989 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE);
1990 yield = DEFER;
1991 goto SEND_QUIT;
41c7c167
PH
1992 }
1993
0d0e4455 1994 /* For SMTPS we need to wait for the initial OK response. */
d093f8e5 1995 if (sx->smtps)
061b7ebd 1996 {
d093f8e5
JH
1997 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
1998 '2', sx->ob->command_timeout);
895fbaf2 1999#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 2000 sx->smtp_greeting = string_copy(sx->buffer);
895fbaf2
JH
2001#endif
2002 if (!good_response) goto RESPONSE_FAILED;
0d0e4455
PP
2003 }
2004
d093f8e5 2005 if (sx->esmtp)
0d0e4455
PP
2006 greeting_cmd = "EHLO";
2007 else
2008 {
2009 greeting_cmd = "HELO";
2010 DEBUG(D_transport)
2011 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
2012 }
2013
4e910c01 2014 if (smtp_write_command(&sx->outblock, SCMD_FLUSH, "%s %s\r\n",
d093f8e5 2015 sx->lmtp ? "LHLO" : greeting_cmd, sx->helo_data) < 0)
0756eb3c 2016 goto SEND_FAILED;
d093f8e5
JH
2017 good_response = smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer),
2018 '2', sx->ob->command_timeout);
895fbaf2 2019#ifdef EXPERIMENTAL_DSN_INFO
d093f8e5 2020 sx->helo_response = string_copy(sx->buffer);
895fbaf2
JH
2021#endif
2022 if (!good_response) goto RESPONSE_FAILED;
2d14f397 2023 smtp_peer_options = 0;
0756eb3c
PH
2024 }
2025
2026/* If the host is required to use a secure channel, ensure that we
2027have one. */
2028
d093f8e5 2029else if ( sx->smtps
0e66b3b6 2030# ifdef EXPERIMENTAL_DANE
d093f8e5 2031 || sx->dane
0e66b3b6 2032# endif
d093f8e5 2033 || verify_check_given_host(&sx->ob->hosts_require_tls, sx->host) == OK
7a31d643 2034 )
0756eb3c 2035 {
de6273b4 2036 errno = ERRNO_TLSREQUIRED;
c562fd30 2037 message = string_sprintf("a TLS session is required, but %s",
14de8063 2038 smtp_peer_options & OPTION_TLS
2d14f397 2039 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
0756eb3c
PH
2040 goto TLS_FAILED;
2041 }
0e66b3b6 2042#endif /*SUPPORT_TLS*/
0756eb3c
PH
2043
2044/* If TLS is active, we have just started it up and re-done the EHLO command,
2045so its response needs to be analyzed. If TLS is not active and this is a
2046continued session down a previously-used socket, we haven't just done EHLO, so
2047we skip this. */
2048
2049if (continue_hostname == NULL
a7538db1 2050#ifdef SUPPORT_TLS
817d9f57 2051 || tls_out.active >= 0
a7538db1 2052#endif
0756eb3c
PH
2053 )
2054 {
d093f8e5 2055 if (sx->esmtp || sx->lmtp)
2d14f397 2056 {
e9166683 2057 sx->peer_offered = ehlo_response(sx->buffer,
d093f8e5 2058 0 /* no TLS */
14de8063
JH
2059 | (sx->lmtp && sx->ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2060 | OPTION_CHUNKING
2061 | OPTION_PRDR
9094b84b 2062#ifdef SUPPORT_I18N
14de8063 2063 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
d093f8e5
JH
2064 /*XXX if we hand peercaps on to continued-conn processes,
2065 must not depend on this addr */
9094b84b 2066#endif
14de8063
JH
2067 | OPTION_DSN
2068 | OPTION_PIPE
2069 | (sx->ob->size_addition >= 0 ? OPTION_SIZE : 0)
9094b84b
JH
2070 );
2071
2d14f397
JH
2072 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2073 lmtp_ignore_quota option was set. */
f1513293 2074
14de8063 2075 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 2076
2d14f397
JH
2077 /* If the response to EHLO specified support for the SIZE parameter, note
2078 this, provided size_addition is non-negative. */
f1513293 2079
14de8063 2080 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
0756eb3c 2081
2d14f397
JH
2082 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2083 the current host, esmtp will be false, so PIPELINING can never be used. If
2084 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 2085
14de8063 2086 if ( sx->peer_offered & OPTION_PIPE
d093f8e5 2087 && verify_check_given_host(&sx->ob->hosts_avoid_pipelining, sx->host) != OK)
14de8063 2088 smtp_peer_options |= OPTION_PIPE;
0756eb3c 2089
2d14f397 2090 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
14de8063 2091 smtp_peer_options & OPTION_PIPE ? "" : "not ");
0756eb3c 2092
14de8063 2093 if ( sx->peer_offered & OPTION_CHUNKING
d093f8e5 2094 && verify_check_given_host(&sx->ob->hosts_try_chunking, sx->host) != OK)
14de8063 2095 sx->peer_offered &= ~OPTION_CHUNKING;
f98442df 2096
14de8063 2097 if (sx->peer_offered & OPTION_CHUNKING)
2d14f397 2098 {DEBUG(D_transport) debug_printf("CHUNKING usable\n");}
0756eb3c 2099
8ccd00b1 2100#ifndef DISABLE_PRDR
14de8063 2101 if ( sx->peer_offered & OPTION_PRDR
d093f8e5 2102 && verify_check_given_host(&sx->ob->hosts_try_prdr, sx->host) != OK)
14de8063 2103 sx->peer_offered &= ~OPTION_PRDR;
fd98a5c6 2104
14de8063 2105 if (sx->peer_offered & OPTION_PRDR)
2d14f397 2106 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
fd98a5c6
JH
2107#endif
2108
2d14f397 2109 /* Note if the server supports DSN */
14de8063 2110 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2d14f397 2111 DEBUG(D_transport) debug_printf("%susing DSN\n",
14de8063 2112 sx->peer_offered & OPTION_DSN ? "" : "not ");
6c1c3d1d 2113
2d14f397
JH
2114 /* Note if the response to EHLO specifies support for the AUTH extension.
2115 If it has, check that this host is one we want to authenticate to, and do
2116 the business. The host name and address must be available when the
2117 authenticator's client driver is running. */
0756eb3c 2118
d093f8e5
JH
2119 switch (yield = smtp_auth(sx->buffer, sizeof(sx->buffer), sx->addrlist, sx->host,
2120 sx->ob, sx->esmtp, &sx->inblock, &sx->outblock))
2d14f397
JH
2121 {
2122 default: goto SEND_QUIT;
2123 case OK: break;
2124 case FAIL_SEND: goto SEND_FAILED;
2125 case FAIL: goto RESPONSE_FAILED;
2126 }
0756eb3c
PH
2127 }
2128 }
14de8063 2129pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
0756eb3c
PH
2130
2131/* The setting up of the SMTP call is now complete. Any subsequent errors are
2132message-specific. */
2133
d093f8e5 2134sx->setting_up = FALSE;
0756eb3c 2135
8c5d388a 2136#ifdef SUPPORT_I18N
d093f8e5 2137if (sx->addrlist->prop.utf8_msg)
9094b84b 2138 {
d093f8e5
JH
2139 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2140 && !sx->addrlist->prop.utf8_downcvt_maybe;
2141 DEBUG(D_transport) if (!sx->utf8_needed)
59a286ef 2142 debug_printf("utf8: %s downconvert\n",
d093f8e5 2143 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
9094b84b
JH
2144 }
2145
7ade712c 2146/* If this is an international message we need the host to speak SMTPUTF8 */
14de8063 2147if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
7ade712c
JH
2148 {
2149 errno = ERRNO_UTF8_FWD;
2150 goto RESPONSE_FAILED;
2151 }
2152#endif
2153
d093f8e5
JH
2154return OK;
2155
2156
2157 {
2158 int code;
d093f8e5
JH
2159
2160 RESPONSE_FAILED:
d093f8e5 2161 message = NULL;
de6273b4 2162 sx->send_quit = check_response(sx->host, &errno, sx->addrlist->more_errno,
d093f8e5
JH
2163 sx->buffer, &code, &message, &pass_message);
2164 goto FAILED;
d093f8e5
JH
2165
2166 SEND_FAILED:
d093f8e5
JH
2167 code = '4';
2168 message = US string_sprintf("send() to %s [%s] failed: %s",
829dd842 2169 sx->host->name, sx->host->address, strerror(errno));
d093f8e5
JH
2170 sx->send_quit = FALSE;
2171 goto FAILED;
d093f8e5
JH
2172
2173 /* This label is jumped to directly when a TLS negotiation has failed,
2174 or was not done for a host for which it is required. Values will be set
829dd842 2175 in message and errno, and setting_up will always be true. Treat as
d093f8e5
JH
2176 a temporary error. */
2177
de6273b4
JH
2178 EHLOHELO_FAILED:
2179 code = '4';
2180 message = string_sprintf("Remote host closed connection in response to %s"
2181 " (EHLO response was: %s)", smtp_command, sx->buffer);
2182 sx->send_quit = FALSE;
2183 goto FAILED;
2184
d093f8e5
JH
2185#ifdef SUPPORT_TLS
2186 TLS_FAILED:
de6273b4
JH
2187 code = '4';
2188 goto FAILED;
d093f8e5
JH
2189#endif
2190
2191 /* The failure happened while setting up the call; see if the failure was
2192 a 5xx response (this will either be on connection, or following HELO - a 5xx
e69636bc
JH
2193 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2194 fail all addresses, as this host is never going to accept them. For other
2195 errors during setting up (timeouts or whatever), defer all addresses, and
2196 yield DEFER, so that the host is not tried again for a while.
2197
2198 XXX This peeking for another host feels like a layering violation. We want
2199 to note the host as unusable, but down here we shouldn't know if this was
2200 the last host to try for the addr(list). Perhaps the upper layer should be
2201 the one to do set_errno() ? The problem is that currently the addr is where
2202 errno etc. are stashed, but until we run out of hosts to try the errors are
2203 host-specific. Maybe we should enhance the host_item definition? */
d093f8e5 2204
de6273b4 2205FAILED:
d093f8e5 2206 sx->ok = FALSE; /* For when reached by GOTO */
e69636bc
JH
2207 set_errno(sx->addrlist, errno, message,
2208 sx->host->next
2209 ? DEFER
2210 : code == '5'
d093f8e5 2211#ifdef SUPPORT_I18N
e69636bc 2212 || errno == ERRNO_UTF8_FWD
d093f8e5 2213#endif
e69636bc
JH
2214 ? FAIL : DEFER,
2215 pass_message, sx->host
d093f8e5
JH
2216#ifdef EXPERIMENTAL_DSN_INFO
2217 , sx->smtp_greeting, sx->helo_response
2218#endif
2219 );
e69636bc 2220 yield = DEFER;
d093f8e5
JH
2221 }
2222
2223
2224SEND_QUIT:
2225
2226if (sx->send_quit)
4e910c01 2227 (void)smtp_write_command(&sx->outblock, SCMD_FLUSH, "QUIT\r\n");
d093f8e5 2228
d093f8e5
JH
2229#ifdef SUPPORT_TLS
2230tls_close(FALSE, TRUE);
2231#endif
2232
2233/* Close the socket, and return the appropriate value, first setting
2234works because the NULL setting is passed back to the calling process, and
2235remote_max_parallel is forced to 1 when delivering over an existing connection,
b7d3afcf 2236*/
d093f8e5 2237
e1d04f48 2238HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
d093f8e5
JH
2239if (sx->send_quit)
2240 {
2241 shutdown(sx->outblock.sock, SHUT_WR);
2242 if (fcntl(sx->inblock.sock, F_SETFL, O_NONBLOCK) == 0)
2243 for (rc = 16; read(sx->inblock.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && rc > 0;)
2244 rc--; /* drain socket */
02b41d71 2245 sx->send_quit = FALSE;
d093f8e5
JH
2246 }
2247(void)close(sx->inblock.sock);
02b41d71 2248sx->inblock.sock = sx->outblock.sock = -1;
d093f8e5
JH
2249
2250#ifndef DISABLE_EVENT
2251(void) event_raise(sx->tblock->event_action, US"tcp:close", NULL);
2252#endif
2253
2254continue_transport = NULL;
2255continue_hostname = NULL;
2256return yield;
2257}
2258
2259
9be4572b
JH
2260
2261
2262/* Create the string of options that will be appended to the MAIL FROM:
2263in the connection context buffer */
2264
2265static int
2266build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2267{
2268uschar * p = sx->buffer;
2269address_item * addr;
2270int address_count;
2271
2272*p = 0;
2273
14de8063 2274/* If we know the receiving MTA supports the SIZE qualification, and we know it,
9be4572b
JH
2275send it, adding something to the message size to allow for imprecision
2276and things that get added en route. Exim keeps the number of lines
2277in a message, so we can give an accurate value for the original message, but we
2278need some additional to handle added headers. (Double "." characters don't get
2279included in the count.) */
2280
14de8063
JH
2281if ( message_size > 0
2282 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
9be4572b 2283 {
328c5688
JH
2284/*XXX problem here under spool_files_wireformat?
2285Or just forget about lines? Or inflate by a fixed proportion? */
2286
9be4572b
JH
2287 sprintf(CS p, " SIZE=%d", message_size+message_linecount+sx->ob->size_addition);
2288 while (*p) p++;
2289 }
2290
2291#ifndef DISABLE_PRDR
2292/* If it supports Per-Recipient Data Reponses, and we have omre than one recipient,
2293request that */
2294
2295sx->prdr_active = FALSE;
14de8063 2296if (sx->peer_offered & OPTION_PRDR)
9be4572b
JH
2297 for (addr = addrlist; addr; addr = addr->next)
2298 if (addr->transport_return == PENDING_DEFER)
2299 {
2300 for (addr = addr->next; addr; addr = addr->next)
2301 if (addr->transport_return == PENDING_DEFER)
2302 { /* at least two recipients to send */
2303 sx->prdr_active = TRUE;
2304 sprintf(CS p, " PRDR"); p += 5;
2305 break;
2306 }
2307 break;
2308 }
2309#endif
2310
2311#ifdef SUPPORT_I18N
2312/* If it supports internationalised messages, and this meesage need that,
2313request it */
2314
14de8063 2315if ( sx->peer_offered & OPTION_UTF8
9be4572b
JH
2316 && addrlist->prop.utf8_msg
2317 && !addrlist->prop.utf8_downcvt
2318 )
2319 Ustrcpy(p, " SMTPUTF8"), p += 9;
2320#endif
2321
2322/* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
2323for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
2324 addr && address_count < sx->max_rcpt;
2325 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2326 {
2327 address_count++;
2328 if (!(addr->dsn_flags & rf_dsnlasthop))
2329 {
2330 sx->dsn_all_lasthop = FALSE;
2331 break;
2332 }
2333 }
2334
2335/* Add any DSN flags to the mail command */
2336
14de8063 2337if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
9be4572b
JH
2338 {
2339 if (dsn_ret == dsn_ret_hdrs)
2340 { Ustrcpy(p, " RET=HDRS"); p += 9; }
2341 else if (dsn_ret == dsn_ret_full)
2342 { Ustrcpy(p, " RET=FULL"); p += 9; }
2343
2344 if (dsn_envid)
2345 {
2346 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
2347 while (*p) p++;
2348 }
2349 }
2350
2351/* If an authenticated_sender override has been specified for this transport
2352instance, expand it. If the expansion is forced to fail, and there was already
2353an authenticated_sender for this message, the original value will be used.
2354Other expansion failures are serious. An empty result is ignored, but there is
2355otherwise no check - this feature is expected to be used with LMTP and other
2356cases where non-standard addresses (e.g. without domains) might be required. */
2357
2358if (smtp_mail_auth_str(p, sizeof(sx->buffer) - (p-sx->buffer), addrlist, sx->ob))
2359 return ERROR;
2360
2361return OK;
2362}
2363
2364
2365static void
2366build_rcptcmd_options(smtp_context * sx, const address_item * addr)
2367{
2368uschar * p = sx->buffer;
2369*p = 0;
2370
2371/* Add any DSN flags to the rcpt command */
2372
14de8063 2373if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
9be4572b
JH
2374 {
2375 if (addr->dsn_flags & rf_dsnflags)
2376 {
2377 int i;
2378 BOOL first = TRUE;
2379
2380 Ustrcpy(p, " NOTIFY=");
2381 while (*p) p++;
2382 for (i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
2383 {
2384 if (!first) *p++ = ',';
2385 first = FALSE;
2386 Ustrcpy(p, rf_names[i]);
2387 while (*p) p++;
2388 }
2389 }
2390
2391 if (addr->dsn_orcpt)
2392 {
2393 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
2394 addr->dsn_orcpt);
2395 while (*p) p++;
2396 }
2397 }
2398}
2399
2400
d9c3c8ed
JH
2401
2402/*
2403Return:
e9166683
JH
2404 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
2405 -1 MAIL response error
2406 -2 any non-MAIL read i/o error
2407 -3 non-MAIL response timeout
2408 -4 internal error; channel still usable
2409 -5 transmit failed
d9c3c8ed
JH
2410 */
2411
2412int
2413smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
2414{
2415address_item * addr;
2416int address_count;
2417int rc;
2418
2419if (build_mailcmd_options(sx, sx->first_addr) != OK)
2420 {
2421 *yield = ERROR;
e9166683 2422 return -4;
d9c3c8ed
JH
2423 }
2424
2425/* From here until we send the DATA command, we can make use of PIPELINING
2426if the server host supports it. The code has to be able to check the responses
2427at any point, for when the buffer fills up, so we write it totally generally.
2428When PIPELINING is off, each command written reports that it has flushed the
2429buffer. */
2430
2431sx->pending_MAIL = TRUE; /* The block starts with MAIL */
2432
2433 {
2434 uschar * s = sx->from_addr;
2435#ifdef SUPPORT_I18N
2436 uschar * errstr = NULL;
2437
2438 /* If we must downconvert, do the from-address here. Remember we had to
2439 for the to-addresses (done below), and also (ugly) for re-doing when building
2440 the delivery log line. */
2441
2442 if ( sx->addrlist->prop.utf8_msg
14de8063 2443 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
d9c3c8ed
JH
2444 )
2445 {
2446 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
2447 {
2448 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE);
2449 *yield = ERROR;
e9166683 2450 return -4;
d9c3c8ed
JH
2451 }
2452 setflag(sx->addrlist, af_utf8_downcvt);
2453 }
2454#endif
2455
4e910c01 2456 rc = smtp_write_command(&sx->outblock, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
d9c3c8ed
JH
2457 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
2458 }
2459
2460mail_command = string_copy(big_buffer); /* Save for later error message */
2461
2462switch(rc)
2463 {
2464 case -1: /* Transmission error */
e9166683 2465 return -5;
d9c3c8ed 2466
df5b41e3 2467 case +1: /* Cmd was sent */
d9c3c8ed
JH
2468 if (!smtp_read_response(&sx->inblock, sx->buffer, sizeof(sx->buffer), '2',
2469 sx->ob->command_timeout))
2470 {
2471 if (errno == 0 && sx->buffer[0] == '4')
2472 {
2473 errno = ERRNO_MAIL4XX;
2474 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
2475 }
2476 return -1;
2477 }
2478 sx->pending_MAIL = FALSE;
2479 break;
e9166683
JH
2480
2481 /* otherwise zero: command queued for pipeline */
d9c3c8ed
JH
2482 }
2483
2484/* Pass over all the relevant recipient addresses for this host, which are the
2485ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
2486several before we have to read the responses for those seen so far. This
2487checking is done by a subroutine because it also needs to be done at the end.
2488Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
2489the next one if not all are sent.
2490
2491In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
2492last address because we want to abort if any recipients have any kind of
2493problem, temporary or permanent. We know that all recipient addresses will have
2494the PENDING_DEFER status, because only one attempt is ever made, and we know
e9166683
JH
2495that max_rcpt will be large, so all addresses will be done at once.
2496
2497For verify we flush the pipeline after any (the only) rcpt address. */
d9c3c8ed
JH
2498
2499for (addr = sx->first_addr, address_count = 0;
2500 addr && address_count < sx->max_rcpt;
2501 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
2502 {
2503 int count;
2504 BOOL no_flush;
2505 uschar * rcpt_addr;
2506
14de8063 2507 addr->dsn_aware = sx->peer_offered & OPTION_DSN
d9c3c8ed
JH
2508 ? dsn_support_yes : dsn_support_no;
2509
2510 address_count++;
4c2471ca
JH
2511 no_flush = pipelining_active && !sx->verify
2512 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
d9c3c8ed
JH
2513
2514 build_rcptcmd_options(sx, addr);
2515
2516 /* Now send the RCPT command, and process outstanding responses when
2517 necessary. After a timeout on RCPT, we just end the function, leaving the
2518 yield as OK, because this error can often mean that there is a problem with
2519 just one address, so we don't want to delay the host. */
2520
2521 rcpt_addr = transport_rcpt_address(addr, sx->tblock->rcpt_include_affixes);
2522
2523#ifdef SUPPORT_I18N
2524 if ( testflag(sx->addrlist, af_utf8_downcvt)
2525 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
2526 )
2527 {
2528 /*XXX could we use a per-address errstr here? Not fail the whole send? */
2529 errno = ERRNO_EXPANDFAIL;
e9166683 2530 return -5; /*XXX too harsh? */
d9c3c8ed
JH
2531 }
2532#endif
2533
4e910c01
JH
2534 count = smtp_write_command(&sx->outblock, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
2535 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
d9c3c8ed 2536
e9166683 2537 if (count < 0) return -5;
d9c3c8ed
JH
2538 if (count > 0)
2539 {
df5b41e3 2540 switch(sync_responses(sx, count, 0))
d9c3c8ed
JH
2541 {
2542 case 3: sx->ok = TRUE; /* 2xx & 5xx => OK & progress made */
2543 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
e9166683 2544 break;
d9c3c8ed
JH
2545
2546 case 1: sx->ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
2547 if (!sx->lmtp) /* can't tell about progress yet */
2548 sx->completed_addr = TRUE;
2549 case 0: /* No 2xx or 5xx, but no probs */
2550 break;
2551
e9166683
JH
2552 case -1: return -3; /* Timeout on RCPT */
2553 case -2: return -2; /* non-MAIL read i/o error */
2554 default: return -1; /* any MAIL error */
d9c3c8ed
JH
2555 }
2556 sx->pending_MAIL = FALSE; /* Dealt with MAIL */
2557 }
2558 } /* Loop for next address */
2559
2560sx->next_addr = addr;
2561return 0;
2562}
2563
2564
875512a3
JH
2565#ifdef SUPPORT_TLS
2566/*****************************************************
2567* Proxy TLS connection for another transport process *
2568******************************************************/
2569/*
57cc2785
JH
2570Use the given buffer as a staging area, and select on both the given fd
2571and the TLS'd client-fd for data to read (per the coding in ip_recv() and
875512a3
JH
2572fd_ready() this is legitimate). Do blocking full-size writes, and reads
2573under a timeout.
2574
2575Arguments:
57cc2785
JH
2576 buf space to use for buffering
2577 bufsiz size of buffer
875512a3
JH
2578 proxy_fd comms to proxied process
2579 timeout per-read timeout, seconds
2580*/
2581
57cc2785
JH
2582void
2583smtp_proxy_tls(uschar * buf, size_t bsize, int proxy_fd, int timeout)
875512a3 2584{
e47252f5 2585fd_set rfds, efds;
875512a3
JH
2586int max_fd = MAX(proxy_fd, tls_out.active) + 1;
2587int rc, i, fd_bits, nbytes;
2588
2589set_process_info("proxying TLS connection for continued transport");
e47252f5
JH
2590FD_ZERO(&rfds);
2591FD_SET(tls_out.active, &rfds);
2592FD_SET(proxy_fd, &rfds);
875512a3
JH
2593
2594for (fd_bits = 3; fd_bits; )
2595 {
2596 time_t time_left = timeout;
2597 time_t time_start = time(NULL);
2598
2599 /* wait for data */
e47252f5 2600 efds = rfds;
875512a3
JH
2601 do
2602 {
2603 struct timeval tv = { time_left, 0 };
2604
e47252f5
JH
2605 rc = select(max_fd,
2606 (SELECT_ARG2_TYPE *)&rfds, NULL, (SELECT_ARG2_TYPE *)&efds, &tv);
875512a3
JH
2607
2608 if (rc < 0 && errno == EINTR)
2609 if ((time_left -= time(NULL) - time_start) > 0) continue;
2610
2611 if (rc <= 0)
2612 {
2613 DEBUG(D_transport) if (rc == 0) debug_printf("%s: timed out\n", __FUNCTION__);
2614 return;
2615 }
e47252f5
JH
2616
2617 if (FD_ISSET(tls_out.active, &efds) || FD_ISSET(proxy_fd, &efds))
2618 {
2619 DEBUG(D_transport) debug_printf("select: exceptional cond on %s fd\n",
2620 FD_ISSET(proxy_fd, &efds) ? "proxy" : "tls");
2621 return;
2622 }
875512a3 2623 }
e47252f5 2624 while (rc < 0 || !(FD_ISSET(tls_out.active, &rfds) || FD_ISSET(proxy_fd, &rfds)));
875512a3
JH
2625
2626 /* handle inbound data */
e47252f5 2627 if (FD_ISSET(tls_out.active, &rfds))
57cc2785 2628 if ((rc = tls_read(FALSE, buf, bsize)) <= 0)
875512a3
JH
2629 {
2630 fd_bits &= ~1;
e47252f5 2631 FD_CLR(tls_out.active, &rfds);
875512a3 2632 shutdown(proxy_fd, SHUT_WR);
e47252f5 2633 timeout = 5;
875512a3
JH
2634 }
2635 else
2636 {
2637 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
57cc2785 2638 if ((i = write(proxy_fd, buf + nbytes, rc - nbytes)) < 0) return;
875512a3
JH
2639 }
2640 else if (fd_bits & 1)
e47252f5 2641 FD_SET(tls_out.active, &rfds);
875512a3
JH
2642
2643 /* handle outbound data */
e47252f5 2644 if (FD_ISSET(proxy_fd, &rfds))
57cc2785 2645 if ((rc = read(proxy_fd, buf, bsize)) <= 0)
875512a3 2646 {
e47252f5
JH
2647 fd_bits = 0;
2648 tls_close(FALSE, TRUE);
875512a3
JH
2649 }
2650 else
2651 {
2652 for (nbytes = 0; rc - nbytes > 0; nbytes += i)
925ac8e4
JH
2653 if ((i = tls_write(FALSE, buf + nbytes, rc - nbytes, FALSE)) < 0)
2654 return;
875512a3
JH
2655 }
2656 else if (fd_bits & 2)
e47252f5 2657 FD_SET(proxy_fd, &rfds);
875512a3
JH
2658 }
2659}
2660#endif
2661
2662
d093f8e5
JH
2663/*************************************************
2664* Deliver address list to given host *
2665*************************************************/
2666
2667/* If continue_hostname is not null, we get here only when continuing to
2668deliver down an existing channel. The channel was passed as the standard
2669input. TLS is never active on a passed channel; the previous process always
2670closes it down before passing the connection on.
2671
2672Otherwise, we have to make a connection to the remote host, and do the
2673initial protocol exchange.
2674
2675When running as an MUA wrapper, if the sender or any recipient is rejected,
2676temporarily or permanently, we force failure for all recipients.
2677
2678Arguments:
2679 addrlist chain of potential addresses to deliver; only those whose
2680 transport_return field is set to PENDING_DEFER are currently
2681 being processed; others should be skipped - they have either
2682 been delivered to an earlier host or IP address, or been
2683 failed by one of them.
2684 host host to deliver to
2685 host_af AF_INET or AF_INET6
a843a57e
JH
2686 defport default TCP/IP port to use if host does not specify, in host
2687 byte order
d093f8e5
JH
2688 interface interface to bind to, or NULL
2689 tblock transport instance block
2690 message_defer set TRUE if yield is OK, but all addresses were deferred
2691 because of a non-recipient, non-host failure, that is, a
2692 4xx response to MAIL FROM, DATA, or ".". This is a defer
2693 that is specific to the message.
2694 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
2695 a second attempt after TLS initialization fails
2696
2697Returns: OK - the connection was made and the delivery attempted;
2698 the result for each address is in its data block.
2699 DEFER - the connection could not be made, or something failed
2700 while setting up the SMTP session, or there was a
2701 non-message-specific error, such as a timeout.
2702 ERROR - a filter command is specified for this transport,
2703 and there was a problem setting it up; OR helo_data
2704 or add_headers or authenticated_sender is specified
2705 for this transport, and the string failed to expand
2706*/
2707
2708static int
a843a57e 2709smtp_deliver(address_item *addrlist, host_item *host, int host_af, int defport,
d093f8e5
JH
2710 uschar *interface, transport_instance *tblock,
2711 BOOL *message_defer, BOOL suppress_tls)
2712{
2713address_item *addr;
d093f8e5 2714int yield = OK;
d093f8e5
JH
2715int save_errno;
2716int rc;
32dfdf8b 2717struct timeval start_delivery_time;
d093f8e5 2718
d093f8e5
JH
2719BOOL pass_message = FALSE;
2720uschar *message = NULL;
2721uschar new_message_id[MESSAGE_ID_LENGTH + 1];
d093f8e5
JH
2722
2723smtp_context sx;
2724
32dfdf8b 2725gettimeofday(&start_delivery_time, NULL);
d093f8e5 2726suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
02b41d71 2727*message_defer = FALSE;
d093f8e5
JH
2728
2729sx.addrlist = addrlist;
2730sx.host = host;
2731sx.host_af = host_af,
a843a57e 2732sx.port = defport;
d093f8e5 2733sx.interface = interface;
02b41d71 2734sx.helo_data = NULL;
d093f8e5 2735sx.tblock = tblock;
e9166683 2736sx.verify = FALSE;
d093f8e5 2737
9be4572b
JH
2738/* Get the channel set up ready for a message (MAIL FROM being the next
2739SMTP command to send */
2740
e9166683 2741if ((rc = smtp_setup_conn(&sx, suppress_tls)) != OK)
d093f8e5
JH
2742 return rc;
2743
0756eb3c
PH
2744/* If there is a filter command specified for this transport, we can now
2745set it up. This cannot be done until the identify of the host is known. */
2746
e9166683 2747if (tblock->filter_command)
0756eb3c 2748 {
9b989985 2749 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
2750
2751 /* On failure, copy the error to all addresses, abandon the SMTP call, and
2752 yield ERROR. */
2753
36d295f1
JH
2754 if (!transport_set_up_command(&transport_filter_argv,
2755 tblock->filter_command, TRUE, DEFER, addrlist,
2756 string_sprintf("%.50s transport", tblock->name), NULL))
0756eb3c 2757 {
895fbaf2
JH
2758 set_errno_nohost(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
2759 FALSE);
0756eb3c
PH
2760 yield = ERROR;
2761 goto SEND_QUIT;
2762 }
48f1c853
JH
2763
2764 if ( transport_filter_argv
2765 && *transport_filter_argv
2766 && **transport_filter_argv
14de8063 2767 && sx.peer_offered & OPTION_CHUNKING
48f1c853
JH
2768 )
2769 {
14de8063 2770 sx.peer_offered &= ~OPTION_CHUNKING;
48f1c853
JH
2771 DEBUG(D_transport) debug_printf("CHUNKING not usable due to transport filter\n");
2772 }
0756eb3c
PH
2773 }
2774
36d295f1 2775sx.first_addr = addrlist;
0756eb3c
PH
2776
2777/* For messages that have more than the maximum number of envelope recipients,
2778we want to send several transactions down the same SMTP connection. (See
2779comments in deliver.c as to how this reconciles, heuristically, with
2780remote_max_parallel.) This optimization was added to Exim after the following
2781code was already working. The simplest way to put it in without disturbing the
2782code was to use a goto to jump back to this point when there is another
2783transaction to handle. */
2784
2785SEND_MESSAGE:
d9c3c8ed 2786sx.from_addr = return_path;
36d295f1 2787sx.sync_addr = sx.first_addr;
d093f8e5
JH
2788sx.ok = FALSE;
2789sx.send_rset = TRUE;
d9c3c8ed 2790sx.completed_addr = FALSE;
0756eb3c
PH
2791
2792
57cc2785
JH
2793/* If we are a continued-connection-after-verify the MAIL and RCPT
2794commands were already sent; do not re-send but do mark the addrs as
2795having been accepted up to RCPT stage. A traditional cont-conn
2796always has a sequence number greater than one. */
6b62e899 2797
57cc2785 2798if (continue_hostname && continue_sequence == 1)
0756eb3c 2799 {
57cc2785 2800 address_item * addr;
0756eb3c 2801
57cc2785 2802 sx.peer_offered = smtp_peer_options;
d8b8dd15 2803 sx.pending_MAIL = FALSE;
57cc2785
JH
2804 sx.ok = TRUE;
2805 sx.next_addr = NULL;
0756eb3c 2806
57cc2785
JH
2807 for (addr = addrlist; addr; addr = addr->next)
2808 addr->transport_return = PENDING_OK;
2809 }
2810else
0756eb3c 2811 {
57cc2785
JH
2812 /* Initiate a message transfer. */
2813
2814 switch(smtp_write_mail_and_rcpt_cmds(&sx, &yield))
2815 {
2816 case 0: break;
2817 case -1: case -2: goto RESPONSE_FAILED;
2818 case -3: goto END_OFF;
2819 case -4: goto SEND_QUIT;
2820 default: goto SEND_FAILED;
2821 }
2822
2823 /* If we are an MUA wrapper, abort if any RCPTs were rejected, either
2824 permanently or temporarily. We should have flushed and synced after the last
2825 RCPT. */
2826
2827 if (mua_wrapper)
2828 {
4c2471ca
JH
2829 address_item * a;
2830 unsigned cnt;
2831
2832 for (a = sx.first_addr, cnt = 0; a && cnt < sx.max_rcpt; a = a->next, cnt++)
2833 if (a->transport_return != PENDING_OK)
57cc2785
JH
2834 {
2835 /*XXX could we find a better errno than 0 here? */
4c2471ca
JH
2836 set_errno_nohost(addrlist, 0, a->message, FAIL,
2837 testflag(a, af_pass_message));
57cc2785
JH
2838 sx.ok = FALSE;
2839 break;
2840 }
2841 }
0756eb3c
PH
2842 }
2843
2844/* If ok is TRUE, we know we have got at least one good recipient, and must now
2845send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
2846have a good recipient buffered up if we are pipelining. We don't want to waste
2847time sending DATA needlessly, so we only send it if either ok is TRUE or if we
6d5c916c
JH
2848are pipelining. The responses are all handled by sync_responses().
2849If using CHUNKING, do not send a BDAT until we know how big a chunk we want
2850to send is. */
0756eb3c 2851
14de8063 2852if ( !(sx.peer_offered & OPTION_CHUNKING)
d093f8e5 2853 && (sx.ok || (pipelining_active && !mua_wrapper)))
0756eb3c 2854 {
4e910c01 2855 int count = smtp_write_command(&sx.outblock, SCMD_FLUSH, "DATA\r\n");
6d5c916c 2856
0756eb3c 2857 if (count < 0) goto SEND_FAILED;
df5b41e3 2858 switch(sync_responses(&sx, count, sx.ok ? +1 : -1))
0756eb3c 2859 {
d093f8e5 2860 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
d9c3c8ed 2861 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
0756eb3c
PH
2862 break;
2863
d093f8e5 2864 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
d9c3c8ed 2865 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
0756eb3c
PH
2866 case 0: break; /* No 2xx or 5xx, but no probs */
2867
2868 case -1: goto END_OFF; /* Timeout on RCPT */
2869 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2870 }
0d9fa8c0 2871 pipelining_active = FALSE;
87cb4a16 2872 data_command = string_copy(big_buffer); /* Save for later error message */
0756eb3c
PH
2873 }
2874
0756eb3c
PH
2875/* If there were no good recipients (but otherwise there have been no
2876problems), just set ok TRUE, since we have handled address-specific errors
2877already. Otherwise, it's OK to send the message. Use the check/escape mechanism
2878for handling the SMTP dot-handling protocol, flagging to apply to headers as
2879well as body. Set the appropriate timeout value to be used for each chunk.
2880(Haven't been able to make it work using select() for writing yet.) */
2881
14de8063 2882if (!(sx.peer_offered & OPTION_CHUNKING) && !sx.ok)
6d5c916c
JH
2883 {
2884 /* Save the first address of the next batch. */
d9c3c8ed 2885 sx.first_addr = sx.next_addr;
6d5c916c 2886
d093f8e5 2887 sx.ok = TRUE;
6d5c916c 2888 }
ff5aac2b 2889else
0756eb3c 2890 {
6b46ecc6 2891 transport_ctx tctx = {
cab0c277 2892 {sx.inblock.sock},
6b46ecc6
JH
2893 tblock,
2894 addrlist,
2895 US".", US"..", /* Escaping strings */
65de12cc 2896 topt_use_crlf | topt_escape_headers
6b46ecc6
JH
2897 | (tblock->body_only ? topt_no_headers : 0)
2898 | (tblock->headers_only ? topt_no_body : 0)
2899 | (tblock->return_path_add ? topt_add_return_path : 0)
2900 | (tblock->delivery_date_add ? topt_add_delivery_date : 0)
2901 | (tblock->envelope_to_add ? topt_add_envelope_to : 0)
2902 };
2903
6d5c916c
JH
2904 /* If using CHUNKING we need a callback from the generic transport
2905 support to us, for the sending of BDAT smtp commands and the reaping
2906 of responses. The callback needs a whole bunch of state so set up
2907 a transport-context structure to be passed around. */
2908
14de8063 2909 if (sx.peer_offered & OPTION_CHUNKING)
59932f7d 2910 {
65de12cc 2911 tctx.check_string = tctx.escape_string = NULL;
6d5c916c
JH
2912 tctx.options |= topt_use_bdat;
2913 tctx.chunk_cb = smtp_chunk_cmd_callback;
e9166683
JH
2914 sx.pending_BDAT = FALSE;
2915 sx.good_RCPT = sx.ok;
2916 sx.cmd_count = 0;
2917 tctx.smtp_context = &sx;
59932f7d
JH
2918 }
2919 else
65de12cc 2920 tctx.options |= topt_end_dot;
59932f7d 2921
6d5c916c 2922 /* Save the first address of the next batch. */
d9c3c8ed 2923 sx.first_addr = sx.next_addr;
6d5c916c 2924
e027f545
JH
2925 /* Responses from CHUNKING commands go in buffer. Otherwise,
2926 there has not been a response. */
2927
d093f8e5 2928 sx.buffer[0] = 0;
e027f545 2929
0756eb3c 2930 sigalrm_seen = FALSE;
d093f8e5 2931 transport_write_timeout = sx.ob->data_timeout;
0756eb3c
PH
2932 smtp_command = US"sending data block"; /* For error messages */
2933 DEBUG(D_transport|D_v)
14de8063 2934 if (sx.peer_offered & OPTION_CHUNKING)
6d5c916c
JH
2935 debug_printf(" will write message using CHUNKING\n");
2936 else
2937 debug_printf(" SMTP>> writing message and terminating \".\"\n");
0756eb3c 2938 transport_count = 0;
a7538db1 2939
80a47a2c 2940#ifndef DISABLE_DKIM
42055a33 2941 sx.ok = dkim_transport_write_message(&tctx, &sx.ob->dkim, CUSS &message);
4cd12fe9 2942#else
42055a33 2943 sx.ok = transport_write_message(&tctx, 0);
4cd12fe9 2944#endif
0756eb3c
PH
2945
2946 /* transport_write_message() uses write() because it is called from other
2947 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2948 it can exit with "Broken pipe" as its error. This really means that the
2949 socket got closed at the far end. */
2950
2951 transport_write_timeout = 0; /* for subsequent transports */
2952
2953 /* Failure can either be some kind of I/O disaster (including timeout),
e027f545
JH
2954 or the failure of a transport filter or the expansion of added headers.
2955 Or, when CHUNKING, it can be a protocol-detected failure. */
0756eb3c 2956
d093f8e5 2957 if (!sx.ok)
b9df1829
JH
2958 if (message) goto SEND_FAILED;
2959 else goto RESPONSE_FAILED;
0756eb3c
PH
2960
2961 /* We used to send the terminating "." explicitly here, but because of
2962 buffering effects at both ends of TCP/IP connections, you don't gain
2963 anything by keeping it separate, so it might as well go in the final
2964 data buffer for efficiency. This is now done by setting the topt_end_dot
2965 flag above. */
2966
2967 smtp_command = US"end of data";
2968
14de8063 2969 if (sx.peer_offered & OPTION_CHUNKING && sx.cmd_count > 1)
6d5c916c
JH
2970 {
2971 /* Reap any outstanding MAIL & RCPT commands, but not a DATA-go-ahead */
e9166683 2972 switch(sync_responses(&sx, sx.cmd_count-1, 0))
6d5c916c 2973 {
d093f8e5 2974 case 3: sx.ok = TRUE; /* 2xx & 5xx => OK & progress made */
d9c3c8ed 2975 case 2: sx.completed_addr = TRUE; /* 5xx (only) => progress made */
6d5c916c
JH
2976 break;
2977
d093f8e5 2978 case 1: sx.ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
d9c3c8ed 2979 if (!sx.lmtp) sx.completed_addr = TRUE; /* can't tell about progress yet */
6d5c916c
JH
2980 case 0: break; /* No 2xx or 5xx, but no probs */
2981
2982 case -1: goto END_OFF; /* Timeout on RCPT */
2983 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
2984 }
2985 }
2986
8ccd00b1 2987#ifndef DISABLE_PRDR
fd98a5c6
JH
2988 /* For PRDR we optionally get a partial-responses warning
2989 * followed by the individual responses, before going on with
2990 * the overall response. If we don't get the warning then deal
2991 * with per non-PRDR. */
d093f8e5 2992 if(sx.prdr_active)
fd98a5c6 2993 {
d093f8e5
JH
2994 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '3',
2995 sx.ob->final_timeout);
2996 if (!sx.ok && errno == 0) switch(sx.buffer[0])
e027f545 2997 {
d093f8e5
JH
2998 case '2': sx.prdr_active = FALSE;
2999 sx.ok = TRUE;
e027f545
JH
3000 break;
3001 case '4': errno = ERRNO_DATA4XX;
3002 addrlist->more_errno |=
d093f8e5 3003 ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
e027f545
JH
3004 break;
3005 }
fd98a5c6
JH
3006 }
3007 else
3008#endif
3009
3010 /* For non-PRDR SMTP, we now read a single response that applies to the
3011 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 3012
d093f8e5 3013 if (!sx.lmtp)
e97957bc 3014 {
d093f8e5
JH
3015 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3016 sx.ob->final_timeout);
3017 if (!sx.ok && errno == 0 && sx.buffer[0] == '4')
e97957bc
PH
3018 {
3019 errno = ERRNO_DATA4XX;
d093f8e5 3020 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
e97957bc
PH
3021 }
3022 }
0756eb3c
PH
3023
3024 /* For LMTP, we get back a response for every RCPT command that we sent;
3025 some may be accepted and some rejected. For those that get a response, their
3026 status is fixed; any that are accepted have been handed over, even if later
3027 responses crash - at least, that's how I read RFC 2033.
3028
3029 If all went well, mark the recipient addresses as completed, record which
3030 host/IPaddress they were delivered to, and cut out RSET when sending another
3031 message down the same channel. Write the completed addresses to the journal
3032 now so that they are recorded in case there is a crash of hardware or
3033 software before the spool gets updated. Also record the final SMTP
3034 confirmation if needed (for SMTP only). */
3035
d093f8e5 3036 if (sx.ok)
0756eb3c
PH
3037 {
3038 int flag = '=';
32dfdf8b 3039 struct timeval delivery_time;
0756eb3c 3040 int len;
32dfdf8b 3041 uschar * conf = NULL;
0d9fa8c0 3042
32dfdf8b 3043 timesince(&delivery_time, &start_delivery_time);
d093f8e5 3044 sx.send_rset = FALSE;
0d9fa8c0 3045 pipelining_active = FALSE;
0756eb3c 3046
0756eb3c
PH
3047 /* Set up confirmation if needed - applies only to SMTP */
3048
d68218c7 3049 if (
0cbf2b82 3050#ifdef DISABLE_EVENT
6c6d6e48 3051 LOGGING(smtp_confirmation) &&
a7538db1 3052#endif
d093f8e5 3053 !sx.lmtp
d68218c7 3054 )
0756eb3c 3055 {
d093f8e5 3056 const uschar *s = string_printing(sx.buffer);
55414b25 3057 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
d093f8e5 3058 conf = (s == sx.buffer)? (uschar *)string_copy(s) : US s;
0756eb3c
PH
3059 }
3060
fd98a5c6 3061 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
3062 each one. */
3063
d9c3c8ed 3064 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
0756eb3c
PH
3065 {
3066 if (addr->transport_return != PENDING_OK) continue;
3067
3068 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
3069 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
3070 address. For temporary errors, add a retry item for the address so that
3071 it doesn't get tried again too soon. */
0756eb3c 3072
8ccd00b1 3073#ifndef DISABLE_PRDR
d093f8e5 3074 if (sx.lmtp || sx.prdr_active)
fd98a5c6 3075#else
d093f8e5 3076 if (sx.lmtp)
fd98a5c6 3077#endif
0756eb3c 3078 {
d093f8e5
JH
3079 if (!smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3080 sx.ob->final_timeout))
0756eb3c 3081 {
d093f8e5 3082 if (errno != 0 || sx.buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 3083 addr->message = string_sprintf(
8ccd00b1 3084#ifndef DISABLE_PRDR
d093f8e5 3085 "%s error after %s: %s", sx.prdr_active ? "PRDR":"LMTP",
fd98a5c6
JH
3086#else
3087 "LMTP error after %s: %s",
3088#endif
d093f8e5 3089 data_command, string_printing(sx.buffer));
75def545 3090 setflag(addr, af_pass_message); /* Allow message to go to user */
d093f8e5 3091 if (sx.buffer[0] == '5')
75def545
PH
3092 addr->transport_return = FAIL;
3093 else
3094 {
e97957bc 3095 errno = ERRNO_DATA4XX;
d093f8e5 3096 addr->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
75def545 3097 addr->transport_return = DEFER;
8ccd00b1 3098#ifndef DISABLE_PRDR
d093f8e5 3099 if (!sx.prdr_active)
fd98a5c6
JH
3100#endif
3101 retry_add_item(addr, addr->address_retry_key, 0);
75def545 3102 }
0756eb3c
PH
3103 continue;
3104 }
d9c3c8ed 3105 sx.completed_addr = TRUE; /* NOW we can set this flag */
6c6d6e48 3106 if (LOGGING(smtp_confirmation))
c0ea85ab 3107 {
d093f8e5 3108 const uschar *s = string_printing(sx.buffer);
55414b25 3109 /* deconst cast ok here as string_printing was checked to have alloc'n'copied */
d093f8e5 3110 conf = (s == sx.buffer) ? US string_copy(s) : US s;
c0ea85ab 3111 }
0756eb3c
PH
3112 }
3113
3114 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 3115 actual host that was used. */
0756eb3c
PH
3116
3117 addr->transport_return = OK;
32dfdf8b
JH
3118 addr->more_errno = delivery_time.tv_sec;
3119 addr->delivery_usec = delivery_time.tv_usec;
d427a7f9 3120 addr->host_used = host;
0756eb3c
PH
3121 addr->special_action = flag;
3122 addr->message = conf;
8ccd00b1 3123#ifndef DISABLE_PRDR
d093f8e5 3124 if (sx.prdr_active) addr->flags |= af_prdr_used;
fd98a5c6 3125#endif
14de8063 3126 if (sx.peer_offered & OPTION_CHUNKING) addr->flags |= af_chunking_used;
0756eb3c
PH
3127 flag = '-';
3128
8ccd00b1 3129#ifndef DISABLE_PRDR
d093f8e5 3130 if (!sx.prdr_active)
fd98a5c6
JH
3131#endif
3132 {
3133 /* Update the journal. For homonymic addresses, use the base address plus
3134 the transport name. See lots of comments in deliver.c about the reasons
3135 for the complications when homonyms are involved. Just carry on after
3136 write error, as it may prove possible to update the spool file later. */
4d8d62b9 3137
fd98a5c6 3138 if (testflag(addr, af_homonym))
d093f8e5 3139 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
fd98a5c6 3140 else
d093f8e5 3141 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
4d8d62b9 3142
57cc2785 3143 DEBUG(D_deliver) debug_printf("S:journalling %s\n", sx.buffer);
d093f8e5
JH
3144 len = Ustrlen(CS sx.buffer);
3145 if (write(journal_fd, sx.buffer, len) != len)
fd98a5c6 3146 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
d093f8e5 3147 "%s: %s", sx.buffer, strerror(errno));
fd98a5c6 3148 }
0756eb3c
PH
3149 }
3150
8ccd00b1 3151#ifndef DISABLE_PRDR
d093f8e5 3152 if (sx.prdr_active)
fd98a5c6
JH
3153 {
3154 /* PRDR - get the final, overall response. For any non-success
3155 upgrade all the address statuses. */
d093f8e5
JH
3156 sx.ok = smtp_read_response(&sx.inblock, sx.buffer, sizeof(sx.buffer), '2',
3157 sx.ob->final_timeout);
3158 if (!sx.ok)
fd98a5c6 3159 {
d093f8e5 3160 if(errno == 0 && sx.buffer[0] == '4')
fd98a5c6
JH
3161 {
3162 errno = ERRNO_DATA4XX;
d093f8e5 3163 addrlist->more_errno |= ((sx.buffer[1] - '0')*10 + sx.buffer[2] - '0') << 8;
fd98a5c6 3164 }
d9c3c8ed 3165 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
d093f8e5 3166 if (sx.buffer[0] == '5' || addr->transport_return == OK)
fd98a5c6
JH
3167 addr->transport_return = PENDING_OK; /* allow set_errno action */
3168 goto RESPONSE_FAILED;
3169 }
3170
3171 /* Update the journal, or setup retry. */
d9c3c8ed 3172 for (addr = addrlist; addr != sx.first_addr; addr = addr->next)
fd98a5c6 3173 if (addr->transport_return == OK)
9be4572b
JH
3174 {
3175 if (testflag(addr, af_homonym))
3176 sprintf(CS sx.buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
3177 else
3178 sprintf(CS sx.buffer, "%.500s\n", addr->unique);
3179
3180 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s\n", sx.buffer);
3181 len = Ustrlen(CS sx.buffer);
3182 if (write(journal_fd, sx.buffer, len) != len)
3183 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
3184 "%s: %s", sx.buffer, strerror(errno));
3185 }
3186 else if (addr->transport_return == DEFER)
3187 retry_add_item(addr, addr->address_retry_key, -2);
fd98a5c6
JH
3188 }
3189#endif
3190