debug tidying
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
f9ba5e22 5/* Copyright (c) University of Cambridge 1995 - 2018 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
14ca5d2a
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11#if defined(SUPPORT_DANE) && defined(DISABLE_TLS)
12# error TLS is required for DANE
13#endif
14
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15
16/* Options specific to the smtp transport. This transport also supports LMTP
17over TCP/IP. The options must be in alphabetic order (note that "_" comes
18before the lower case letters). Some live in the transport_instance block so as
19to be publicly visible; these are flagged with opt_public. */
20
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21#define LOFF(field) OPT_OFF(smtp_transport_options_block, field)
22
0756eb3c 23optionlist smtp_transport_options[] = {
506900af 24 { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public,
13a4b4c1 25 OPT_OFF(transport_instance, expand_multi_domain) },
9c695f6d 26 { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden,
13a4b4c1 27 LOFF(expand_retry_include_ip_address) },
9c695f6d 28
48c7f9e2 29 { "address_retry_include_sender", opt_bool,
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30 LOFF(address_retry_include_sender) },
31 { "allow_localhost", opt_bool, LOFF(allow_localhost) },
617d3932 32#ifdef EXPERIMENTAL_ARC
13a4b4c1 33 { "arc_sign", opt_stringptr, LOFF(arc_sign) },
617d3932 34#endif
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35 { "authenticated_sender", opt_stringptr, LOFF(authenticated_sender) },
36 { "authenticated_sender_force", opt_bool, LOFF(authenticated_sender_force) },
37 { "command_timeout", opt_time, LOFF(command_timeout) },
38 { "connect_timeout", opt_time, LOFF(connect_timeout) },
0756eb3c 39 { "connection_max_messages", opt_int | opt_public,
13a4b4c1 40 OPT_OFF(transport_instance, connection_max_messages) },
5ec37a55 41# ifdef SUPPORT_DANE
13a4b4c1 42 { "dane_require_tls_ciphers", opt_stringptr, LOFF(dane_require_tls_ciphers) },
5ec37a55 43# endif
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44 { "data_timeout", opt_time, LOFF(data_timeout) },
45 { "delay_after_cutoff", opt_bool, LOFF(delay_after_cutoff) },
80a47a2c 46#ifndef DISABLE_DKIM
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47 { "dkim_canon", opt_stringptr, LOFF(dkim.dkim_canon) },
48 { "dkim_domain", opt_stringptr, LOFF(dkim.dkim_domain) },
49 { "dkim_hash", opt_stringptr, LOFF(dkim.dkim_hash) },
50 { "dkim_identity", opt_stringptr, LOFF(dkim.dkim_identity) },
51 { "dkim_private_key", opt_stringptr, LOFF(dkim.dkim_private_key) },
52 { "dkim_selector", opt_stringptr, LOFF(dkim.dkim_selector) },
53 { "dkim_sign_headers", opt_stringptr, LOFF(dkim.dkim_sign_headers) },
54 { "dkim_strict", opt_stringptr, LOFF(dkim.dkim_strict) },
55 { "dkim_timestamps", opt_stringptr, LOFF(dkim.dkim_timestamps) },
80a47a2c 56#endif
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57 { "dns_qualify_single", opt_bool, LOFF(dns_qualify_single) },
58 { "dns_search_parents", opt_bool, LOFF(dns_search_parents) },
59 { "dnssec_request_domains", opt_stringptr, LOFF(dnssec.request) },
60 { "dnssec_require_domains", opt_stringptr, LOFF(dnssec.require) },
61 { "dscp", opt_stringptr, LOFF(dscp) },
62 { "fallback_hosts", opt_stringptr, LOFF(fallback_hosts) },
63 { "final_timeout", opt_time, LOFF(final_timeout) },
64 { "gethostbyname", opt_bool, LOFF(gethostbyname) },
65 { "helo_data", opt_stringptr, LOFF(helo_data) },
66 { "hosts", opt_stringptr, LOFF(hosts) },
67 { "hosts_avoid_esmtp", opt_stringptr, LOFF(hosts_avoid_esmtp) },
68 { "hosts_avoid_pipelining", opt_stringptr, LOFF(hosts_avoid_pipelining) },
01603eec 69#ifndef DISABLE_TLS
13a4b4c1 70 { "hosts_avoid_tls", opt_stringptr, LOFF(hosts_avoid_tls) },
80a47a2c 71#endif
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72 { "hosts_max_try", opt_int, LOFF(hosts_max_try) },
73 { "hosts_max_try_hardlimit", opt_int, LOFF(hosts_max_try_hardlimit) },
01603eec 74#ifndef DISABLE_TLS
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75 { "hosts_nopass_tls", opt_stringptr, LOFF(hosts_nopass_tls) },
76 { "hosts_noproxy_tls", opt_stringptr, LOFF(hosts_noproxy_tls) },
80a47a2c 77#endif
13a4b4c1 78 { "hosts_override", opt_bool, LOFF(hosts_override) },
81344b40 79#ifndef DISABLE_PIPE_CONNECT
13a4b4c1 80 { "hosts_pipe_connect", opt_stringptr, LOFF(hosts_pipe_connect) },
ee8b8090 81#endif
13a4b4c1 82 { "hosts_randomize", opt_bool, LOFF(hosts_randomize) },
01603eec 83#if !defined(DISABLE_TLS) && !defined(DISABLE_OCSP)
13a4b4c1 84 { "hosts_request_ocsp", opt_stringptr, LOFF(hosts_request_ocsp) },
44662487 85#endif
13a4b4c1 86 { "hosts_require_auth", opt_stringptr, LOFF(hosts_require_auth) },
01603eec 87#ifndef DISABLE_TLS
c0635b6d 88# ifdef SUPPORT_DANE
13a4b4c1 89 { "hosts_require_dane", opt_stringptr, LOFF(hosts_require_dane) },
7a31d643 90# endif
f2de3a33 91# ifndef DISABLE_OCSP
13a4b4c1 92 { "hosts_require_ocsp", opt_stringptr, LOFF(hosts_require_ocsp) },
f5d78688 93# endif
13a4b4c1 94 { "hosts_require_tls", opt_stringptr, LOFF(hosts_require_tls) },
80a47a2c 95#endif
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96 { "hosts_try_auth", opt_stringptr, LOFF(hosts_try_auth) },
97 { "hosts_try_chunking", opt_stringptr, LOFF(hosts_try_chunking) },
21ee816d 98#ifdef SUPPORT_DANE
13a4b4c1 99 { "hosts_try_dane", opt_stringptr, LOFF(hosts_try_dane) },
96e47838 100#endif
13a4b4c1 101 { "hosts_try_fastopen", opt_stringptr, LOFF(hosts_try_fastopen) },
8ccd00b1 102#ifndef DISABLE_PRDR
13a4b4c1 103 { "hosts_try_prdr", opt_stringptr, LOFF(hosts_try_prdr) },
fd98a5c6 104#endif
01603eec 105#ifndef DISABLE_TLS
13a4b4c1 106 { "hosts_verify_avoid_tls", opt_stringptr, LOFF(hosts_verify_avoid_tls) },
99400968 107#endif
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108 { "interface", opt_stringptr, LOFF(interface) },
109 { "keepalive", opt_bool, LOFF(keepalive) },
110 { "lmtp_ignore_quota", opt_bool, LOFF(lmtp_ignore_quota) },
0756eb3c 111 { "max_rcpt", opt_int | opt_public,
13a4b4c1 112 OPT_OFF(transport_instance, max_addresses) },
506900af 113 { "multi_domain", opt_expand_bool | opt_public,
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114 OPT_OFF(transport_instance, multi_domain) },
115 { "port", opt_stringptr, LOFF(port) },
116 { "protocol", opt_stringptr, LOFF(protocol) },
117 { "retry_include_ip_address", opt_expand_bool, LOFF(retry_include_ip_address) },
118 { "serialize_hosts", opt_stringptr, LOFF(serialize_hosts) },
119 { "size_addition", opt_int, LOFF(size_addition) },
f0989ec0 120#ifdef SUPPORT_SOCKS
13a4b4c1 121 { "socks_proxy", opt_stringptr, LOFF(socks_proxy) },
7eb6c37c 122#endif
01603eec 123#ifndef DISABLE_TLS
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124 { "tls_certificate", opt_stringptr, LOFF(tls_certificate) },
125 { "tls_crl", opt_stringptr, LOFF(tls_crl) },
126 { "tls_dh_min_bits", opt_int, LOFF(tls_dh_min_bits) },
127 { "tls_privatekey", opt_stringptr, LOFF(tls_privatekey) },
128 { "tls_require_ciphers", opt_stringptr, LOFF(tls_require_ciphers) },
b10c87b3 129# ifdef EXPERIMENTAL_TLS_RESUME
13a4b4c1 130 { "tls_resumption_hosts", opt_stringptr, LOFF(tls_resumption_hosts) },
b10c87b3 131# endif
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132 { "tls_sni", opt_stringptr, LOFF(tls_sni) },
133 { "tls_tempfail_tryclear", opt_bool, LOFF(tls_tempfail_tryclear) },
134 { "tls_try_verify_hosts", opt_stringptr, LOFF(tls_try_verify_hosts) },
135 { "tls_verify_cert_hostnames", opt_stringptr, LOFF(tls_verify_cert_hostnames)},
136 { "tls_verify_certificates", opt_stringptr, LOFF(tls_verify_certificates) },
137 { "tls_verify_hosts", opt_stringptr, LOFF(tls_verify_hosts) },
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138#endif
139#ifdef SUPPORT_I18N
13a4b4c1 140 { "utf8_downconvert", opt_stringptr, LOFF(utf8_downconvert) },
80a47a2c 141#endif
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142};
143
144/* Size of the options list. An extern variable has to be used so that its
145address can appear in the tables drtables.c. */
146
71c15846 147int smtp_transport_options_count = nelem(smtp_transport_options);
0756eb3c 148
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149
150#ifdef MACRO_PREDEF
151
152/* Dummy values */
153smtp_transport_options_block smtp_transport_option_defaults = {0};
154void smtp_transport_init(transport_instance *tblock) {}
155BOOL smtp_transport_entry(transport_instance *tblock, address_item *addr) {return FALSE;}
156void smtp_transport_closedown(transport_instance *tblock) {}
157
158#else /*!MACRO_PREDEF*/
159
160
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161/* Default private options block for the smtp transport. */
162
163smtp_transport_options_block smtp_transport_option_defaults = {
838d897c 164 .hosts = NULL,
847cd15f 165 .fallback_hosts = NULL,
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166 .hostlist = NULL,
167 .fallback_hostlist = NULL,
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168 .helo_data = US"$primary_hostname",
169 .interface = NULL,
170 .port = NULL,
171 .protocol = US"smtp",
172 .dscp = NULL,
173 .serialize_hosts = NULL,
174 .hosts_try_auth = NULL,
175 .hosts_require_auth = NULL,
176 .hosts_try_chunking = US"*",
c0635b6d 177#ifdef SUPPORT_DANE
59c0959a 178 .hosts_try_dane = US"*",
838d897c 179 .hosts_require_dane = NULL,
5ec37a55 180 .dane_require_tls_ciphers = NULL,
96e47838 181#endif
efad2f41 182 .hosts_try_fastopen = US"*",
8ccd00b1 183#ifndef DISABLE_PRDR
838d897c 184 .hosts_try_prdr = US"*",
fd98a5c6 185#endif
f2de3a33 186#ifndef DISABLE_OCSP
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187 .hosts_request_ocsp = US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */
188 .hosts_require_ocsp = NULL,
f5d78688 189#endif
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190 .hosts_require_tls = NULL,
191 .hosts_avoid_tls = NULL,
192 .hosts_verify_avoid_tls = NULL,
193 .hosts_avoid_pipelining = NULL,
81344b40 194#ifndef DISABLE_PIPE_CONNECT
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195 .hosts_pipe_connect = NULL,
196#endif
838d897c 197 .hosts_avoid_esmtp = NULL,
01603eec 198#ifndef DISABLE_TLS
838d897c 199 .hosts_nopass_tls = NULL,
96eb7d2a 200 .hosts_noproxy_tls = NULL,
57cc2785 201#endif
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202 .command_timeout = 5*60,
203 .connect_timeout = 5*60,
204 .data_timeout = 5*60,
205 .final_timeout = 10*60,
206 .size_addition = 1024,
207 .hosts_max_try = 5,
208 .hosts_max_try_hardlimit = 50,
209 .address_retry_include_sender = TRUE,
210 .allow_localhost = FALSE,
211 .authenticated_sender_force = FALSE,
212 .gethostbyname = FALSE,
213 .dns_qualify_single = TRUE,
214 .dns_search_parents = FALSE,
ab0e957b 215 .dnssec = { .request= US"*", .require=NULL },
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216 .delay_after_cutoff = TRUE,
217 .hosts_override = FALSE,
218 .hosts_randomize = FALSE,
219 .keepalive = TRUE,
220 .lmtp_ignore_quota = FALSE,
221 .expand_retry_include_ip_address = NULL,
222 .retry_include_ip_address = TRUE,
f0989ec0 223#ifdef SUPPORT_SOCKS
838d897c 224 .socks_proxy = NULL,
b8bf753b 225#endif
01603eec 226#ifndef DISABLE_TLS
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227 .tls_certificate = NULL,
228 .tls_crl = NULL,
229 .tls_privatekey = NULL,
230 .tls_require_ciphers = NULL,
231 .tls_sni = NULL,
232 .tls_verify_certificates = US"system",
233 .tls_dh_min_bits = EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
234 .tls_tempfail_tryclear = TRUE,
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235# ifdef EXPERIMENTAL_TLS_RESUME
236 .tls_resumption_hosts = NULL,
237# endif
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238 .tls_verify_hosts = NULL,
239 .tls_try_verify_hosts = US"*",
240 .tls_verify_cert_hostnames = US"*",
80a47a2c 241#endif
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242#ifdef SUPPORT_I18N
243 .utf8_downconvert = NULL,
244#endif
80a47a2c 245#ifndef DISABLE_DKIM
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246 .dkim =
247 {.dkim_domain = NULL,
7c6ec81b 248 .dkim_identity = NULL,
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249 .dkim_private_key = NULL,
250 .dkim_selector = NULL,
251 .dkim_canon = NULL,
7c6ec81b 252 .dkim_sign_headers = NULL,
838d897c 253 .dkim_strict = NULL,
d73e45df 254 .dkim_hash = US"sha256",
2bc0f45e 255 .dkim_timestamps = NULL,
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256 .dot_stuffed = FALSE,
257 .force_bodyhash = FALSE,
258# ifdef EXPERIMENTAL_ARC
259 .arc_signspec = NULL,
260# endif
261 },
262# ifdef EXPERIMENTAL_ARC
263 .arc_sign = NULL,
264# endif
80a47a2c 265#endif
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266};
267
6c1c3d1d
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268/* some DSN flags for use later */
269
270static int rf_list[] = {rf_notify_never, rf_notify_success,
271 rf_notify_failure, rf_notify_delay };
272
45500060 273static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" };
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274
275
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276
277/* Local statics */
278
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279static uschar *smtp_command; /* Points to last cmd for error messages */
280static uschar *mail_command; /* Points to MAIL cmd for error messages */
281static uschar *data_command = US""; /* Points to DATA cmd for error messages */
282static BOOL update_waiting; /* TRUE to update the "wait" database */
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283
284/*XXX move to smtp_context */
87cb4a16 285static BOOL pipelining_active; /* current transaction is in pipe mode */
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286
287
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288static unsigned ehlo_response(uschar * buf, unsigned checks);
289
290
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291/******************************************************************************/
292
293void
294smtp_deliver_init(void)
295{
296if (!regex_PIPELINING) regex_PIPELINING =
297 regex_must_compile(US"\\n250[\\s\\-]PIPELINING(\\s|\\n|$)", FALSE, TRUE);
298
299if (!regex_SIZE) regex_SIZE =
300 regex_must_compile(US"\\n250[\\s\\-]SIZE(\\s|\\n|$)", FALSE, TRUE);
301
302if (!regex_AUTH) regex_AUTH =
303 regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
304
305#ifndef DISABLE_TLS
306if (!regex_STARTTLS) regex_STARTTLS =
307 regex_must_compile(US"\\n250[\\s\\-]STARTTLS(\\s|\\n|$)", FALSE, TRUE);
308#endif
309
310if (!regex_CHUNKING) regex_CHUNKING =
311 regex_must_compile(US"\\n250[\\s\\-]CHUNKING(\\s|\\n|$)", FALSE, TRUE);
312
313#ifndef DISABLE_PRDR
314if (!regex_PRDR) regex_PRDR =
315 regex_must_compile(US"\\n250[\\s\\-]PRDR(\\s|\\n|$)", FALSE, TRUE);
316#endif
317
318#ifdef SUPPORT_I18N
319if (!regex_UTF8) regex_UTF8 =
320 regex_must_compile(US"\\n250[\\s\\-]SMTPUTF8(\\s|\\n|$)", FALSE, TRUE);
321#endif
322
323if (!regex_DSN) regex_DSN =
324 regex_must_compile(US"\\n250[\\s\\-]DSN(\\s|\\n|$)", FALSE, TRUE);
325
326if (!regex_IGNOREQUOTA) regex_IGNOREQUOTA =
327 regex_must_compile(US"\\n250[\\s\\-]IGNOREQUOTA(\\s|\\n|$)", FALSE, TRUE);
328
81344b40 329#ifndef DISABLE_PIPE_CONNECT
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330if (!regex_EARLY_PIPE) regex_EARLY_PIPE =
331 regex_must_compile(US"\\n250[\\s\\-]" EARLY_PIPE_FEATURE_NAME "(\\s|\\n|$)", FALSE, TRUE);
332#endif
333}
334
335
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336/*************************************************
337* Setup entry point *
338*************************************************/
339
340/* This function is called when the transport is about to be used,
341but before running it in a sub-process. It is used for two things:
342
343 (1) To set the fallback host list in addresses, when delivering.
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344 (2) To pass back the interface, port, protocol, and other options, for use
345 during callout verification.
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346
347Arguments:
348 tblock pointer to the transport instance block
349 addrlist list of addresses about to be transported
350 tf if not NULL, pointer to block in which to return options
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351 uid the uid that will be set (not used)
352 gid the gid that will be set (not used)
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353 errmsg place for error message (not used)
354
355Returns: OK always (FAIL, DEFER not used)
356*/
357
358static int
359smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 360 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
0756eb3c 361{
ee8b8090 362smtp_transport_options_block *ob = SOB tblock->options_block;
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363
364errmsg = errmsg; /* Keep picky compilers happy */
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365uid = uid;
366gid = gid;
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367
368/* Pass back options if required. This interface is getting very messy. */
369
02b41d71 370if (tf)
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371 {
372 tf->interface = ob->interface;
373 tf->port = ob->port;
374 tf->protocol = ob->protocol;
375 tf->hosts = ob->hosts;
376 tf->hosts_override = ob->hosts_override;
377 tf->hosts_randomize = ob->hosts_randomize;
378 tf->gethostbyname = ob->gethostbyname;
379 tf->qualify_single = ob->dns_qualify_single;
380 tf->search_parents = ob->dns_search_parents;
26da7e20 381 tf->helo_data = ob->helo_data;
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382 }
383
384/* Set the fallback host list for all the addresses that don't have fallback
385host lists, provided that the local host wasn't present in the original host
386list. */
387
388if (!testflag(addrlist, af_local_host_removed))
02b41d71
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389 for (; addrlist; addrlist = addrlist->next)
390 if (!addrlist->fallback_hosts) addrlist->fallback_hosts = ob->fallback_hostlist;
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391
392return OK;
393}
394
395
396
397/*************************************************
398* Initialization entry point *
399*************************************************/
400
401/* Called for each instance, after its options have been read, to
402enable consistency checks to be done, or anything else that needs
403to be set up.
404
405Argument: pointer to the transport instance block
406Returns: nothing
407*/
408
409void
410smtp_transport_init(transport_instance *tblock)
411{
ee8b8090 412smtp_transport_options_block *ob = SOB tblock->options_block;
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413
414/* Retry_use_local_part defaults FALSE if unset */
415
416if (tblock->retry_use_local_part == TRUE_UNSET)
417 tblock->retry_use_local_part = FALSE;
418
419/* Set the default port according to the protocol */
420
ee8b8090
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421if (!ob->port)
422 ob->port = strcmpic(ob->protocol, US"lmtp") == 0
423 ? US"lmtp"
424 : strcmpic(ob->protocol, US"smtps") == 0
425 ? US"smtps" : US"smtp";
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426
427/* Set up the setup entry point, to be called before subprocesses for this
428transport. */
429
430tblock->setup = smtp_transport_setup;
431
432/* Complain if any of the timeouts are zero. */
433
434if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
435 ob->final_timeout <= 0)
436 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
437 "command, data, or final timeout value is zero for %s transport",
438 tblock->name);
439
440/* If hosts_override is set and there are local hosts, set the global
441flag that stops verify from showing router hosts. */
442
443if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
444
445/* If there are any fallback hosts listed, build a chain of host items
446for them, but do not do any lookups at this time. */
447
448host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
449}
450
451
452
453
454
455/*************************************************
456* Set delivery info into all active addresses *
457*************************************************/
458
459/* Only addresses whose status is >= PENDING are relevant. A lesser
460status means that an address is not currently being processed.
461
462Arguments:
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463 addrlist points to a chain of addresses
464 errno_value to put in each address's errno field
465 msg to put in each address's message field
466 rc to put in each address's transport_return field
467 pass_message if TRUE, set the "pass message" flag in the address
c562fd30 468 host if set, mark addrs as having used this host
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469 smtp_greeting from peer
470 helo_response from peer
a55697ac 471 start points to timestamp of delivery start
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472
473If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
474the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
475this particular type of timeout.
476
477Returns: nothing
478*/
479
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480static void
481set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
a55697ac 482 BOOL pass_message, host_item * host,
895fbaf2 483#ifdef EXPERIMENTAL_DSN_INFO
a55697ac 484 const uschar * smtp_greeting, const uschar * helo_response,
895fbaf2 485#endif
a55697ac 486 struct timeval * start
895fbaf2 487 )
0756eb3c 488{
0756eb3c 489int orvalue = 0;
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490struct timeval deliver_time;
491
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492if (errno_value == ERRNO_CONNECTTIMEOUT)
493 {
494 errno_value = ETIMEDOUT;
495 orvalue = RTEF_CTOUT;
496 }
a55697ac
JH
497timesince(&deliver_time, start);
498
d7978c0f 499for (address_item * addr = addrlist; addr; addr = addr->next)
168dec3b 500 if (addr->transport_return >= PENDING)
447d236c 501 {
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502 addr->basic_errno = errno_value;
503 addr->more_errno |= orvalue;
a55697ac 504 addr->delivery_time = deliver_time;
02b41d71 505 if (msg)
168dec3b
JH
506 {
507 addr->message = msg;
508 if (pass_message) setflag(addr, af_pass_message);
509 }
510 addr->transport_return = rc;
511 if (host)
895fbaf2 512 {
168dec3b 513 addr->host_used = host;
895fbaf2
JH
514#ifdef EXPERIMENTAL_DSN_INFO
515 if (smtp_greeting)
516 {uschar * s = Ustrchr(smtp_greeting, '\n'); if (s) *s = '\0';}
517 addr->smtp_greeting = smtp_greeting;
518
519 if (helo_response)
520 {uschar * s = Ustrchr(helo_response, '\n'); if (s) *s = '\0';}
521 addr->helo_response = helo_response;
522#endif
523 }
447d236c 524 }
0756eb3c
PH
525}
526
895fbaf2 527static void
a55697ac
JH
528set_errno_nohost(address_item * addrlist, int errno_value, uschar * msg, int rc,
529 BOOL pass_message, struct timeval * start)
895fbaf2 530{
a55697ac 531set_errno(addrlist, errno_value, msg, rc, pass_message, NULL,
895fbaf2 532#ifdef EXPERIMENTAL_DSN_INFO
a55697ac 533 NULL, NULL,
895fbaf2 534#endif
a55697ac 535 start);
895fbaf2 536}
0756eb3c
PH
537
538
539/*************************************************
540* Check an SMTP response *
541*************************************************/
542
543/* This function is given an errno code and the SMTP response buffer
544to analyse, together with the host identification for generating messages. It
545sets an appropriate message and puts the first digit of the response code into
546the yield variable. If no response was actually read, a suitable digit is
547chosen.
548
549Arguments:
447d236c
PH
550 host the current host, to get its name for messages
551 errno_value pointer to the errno value
552 more_errno from the top address for use with ERRNO_FILTER_FAIL
553 buffer the SMTP response buffer
554 yield where to put a one-digit SMTP response code
4c04137d 555 message where to put an error message
447d236c
PH
556 pass_message set TRUE if message is an SMTP response
557
558Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
0756eb3c
PH
559*/
560
a7538db1
JH
561static BOOL
562check_response(host_item *host, int *errno_value, int more_errno,
447d236c 563 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
0756eb3c 564{
0d9fa8c0 565uschar * pl = pipelining_active ? US"pipelined " : US"";
e9166683 566const uschar * s;
0756eb3c
PH
567
568*yield = '4'; /* Default setting is to give a temporary error */
569
e9166683 570switch(*errno_value)
0756eb3c 571 {
e9166683
JH
572 case ETIMEDOUT: /* Handle response timeout */
573 *message = US string_sprintf("SMTP timeout after %s%s",
574 pl, smtp_command);
575 if (transport_count > 0)
576 *message = US string_sprintf("%s (%d bytes written)", *message,
577 transport_count);
578 return FALSE;
579
580 case ERRNO_SMTPFORMAT: /* Handle malformed SMTP response */
581 s = string_printing(buffer);
582 while (isspace(*s)) s++;
583 *message = *s == 0
584 ? string_sprintf("Malformed SMTP reply (an empty line) "
585 "in response to %s%s", pl, smtp_command)
586 : string_sprintf("Malformed SMTP reply in response to %s%s: %s",
587 pl, smtp_command, s);
588 return FALSE;
589
fc243e94
JH
590 case ERRNO_TLSFAILURE: /* Handle bad first read; can happen with
591 GnuTLS and TLS1.3 */
592 *message = US"bad first read from TLS conn";
593 return TRUE;
594
e9166683
JH
595 case ERRNO_FILTER_FAIL: /* Handle a failed filter process error;
596 can't send QUIT as we mustn't end the DATA. */
597 *message = string_sprintf("transport filter process failed (%d)%s",
598 more_errno,
599 more_errno == EX_EXECFAILED ? ": unable to execute command" : "");
600 return FALSE;
601
602 case ERRNO_CHHEADER_FAIL: /* Handle a failed add_headers expansion;
603 can't send QUIT as we mustn't end the DATA. */
604 *message =
605 string_sprintf("failed to expand headers_add or headers_remove: %s",
606 expand_string_message);
607 return FALSE;
608
609 case ERRNO_WRITEINCOMPLETE: /* failure to write a complete data block */
f3ebb786 610 *message = US"failed to write a data block";
e9166683 611 return FALSE;
0756eb3c 612
8c5d388a 613#ifdef SUPPORT_I18N
e9166683
JH
614 case ERRNO_UTF8_FWD: /* no advertised SMTPUTF8, for international message */
615 *message = US"utf8 support required but not offered for forwarding";
616 DEBUG(D_deliver|D_transport) debug_printf("%s\n", *message);
617 return TRUE;
250b6871 618#endif
e9166683 619 }
250b6871 620
0756eb3c
PH
621/* Handle error responses from the remote mailer. */
622
623if (buffer[0] != 0)
624 {
e9166683
JH
625 *message = string_sprintf("SMTP error from remote mail server after %s%s: "
626 "%s", pl, smtp_command, s = string_printing(buffer));
447d236c 627 *pass_message = TRUE;
0756eb3c
PH
628 *yield = buffer[0];
629 return TRUE;
630 }
631
632/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
633connection closed) case, which causes deferral. An explicit connection reset
634error has the same effect. Otherwise, put the host's identity in the message,
635leaving the errno value to be interpreted as well. In all cases, we have to
636assume the connection is now dead. */
0756eb3c 637
19b9dc85 638if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
639 {
640 *errno_value = ERRNO_SMTPCLOSED;
c562fd30 641 *message = US string_sprintf("Remote host closed connection "
02b41d71 642 "in response to %s%s", pl, smtp_command);
0756eb3c 643 }
de6273b4
JH
644else
645 *message = US string_sprintf("%s [%s]", host->name, host->address);
0756eb3c
PH
646
647return FALSE;
648}
649
650
651
652/*************************************************
653* Write error message to logs *
654*************************************************/
655
656/* This writes to the main log and to the message log.
657
658Arguments:
0756eb3c 659 host the current host
ec62d0a9
HSHR
660 detail the current message (addr_item->message)
661 basic_errno the errno (addr_item->basic_errno)
0756eb3c
PH
662
663Returns: nothing
664*/
665
666static void
ec62d0a9 667write_logs(const host_item *host, const uschar *suffix, int basic_errno)
0756eb3c 668{
52f12a7c
JH
669gstring * message = LOGGING(outgoing_port)
670 ? string_fmt_append(NULL, "H=%s [%s]:%d", host->name, host->address,
584ddd64 671 host->port == PORT_NONE ? 25 : host->port)
52f12a7c 672 : string_fmt_append(NULL, "H=%s [%s]", host->name, host->address);
c562fd30 673
ec62d0a9 674if (suffix)
0756eb3c 675 {
52f12a7c 676 message = string_fmt_append(message, ": %s", suffix);
ec62d0a9 677 if (basic_errno > 0)
52f12a7c 678 message = string_fmt_append(message, ": %s", strerror(basic_errno));
0756eb3c
PH
679 }
680else
52f12a7c 681 message = string_fmt_append(message, " %s", exim_errstr(basic_errno));
ec62d0a9 682
52f12a7c
JH
683log_write(0, LOG_MAIN, "%s", string_from_gstring(message));
684deliver_msglog("%s %s\n", tod_stamp(tod_log), message->s);
0756eb3c
PH
685}
686
c562fd30
JH
687static void
688msglog_line(host_item * host, uschar * message)
689{
37f3dc43
JH
690deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log),
691 host->name, host->address, message);
c562fd30
JH
692}
693
0756eb3c
PH
694
695
0cbf2b82 696#ifndef DISABLE_EVENT
d68218c7
JH
697/*************************************************
698* Post-defer action *
699*************************************************/
700
701/* This expands an arbitrary per-transport string.
702 It might, for example, be used to write to the database log.
703
704Arguments:
d68218c7
JH
705 addr the address item containing error information
706 host the current host
78598e6a 707 evstr the event
d68218c7
JH
708
709Returns: nothing
710*/
711
712static void
78598e6a 713deferred_event_raise(address_item * addr, host_item * host, uschar * evstr)
d68218c7 714{
774ef2d7 715uschar * action = addr->transport->event_action;
55414b25 716const uschar * save_domain;
a7538db1
JH
717uschar * save_local;
718
d68218c7 719if (!action)
a7538db1 720 return;
d68218c7 721
a7538db1
JH
722save_domain = deliver_domain;
723save_local = deliver_localpart;
724
725/*XXX would ip & port already be set up? */
726deliver_host_address = string_copy(host->address);
774ef2d7
JH
727deliver_host_port = host->port == PORT_NONE ? 25 : host->port;
728event_defer_errno = addr->basic_errno;
d68218c7
JH
729
730router_name = addr->router->name;
731transport_name = addr->transport->name;
a7538db1
JH
732deliver_domain = addr->domain;
733deliver_localpart = addr->local_part;
734
78598e6a 735(void) event_raise(action, evstr,
a7538db1
JH
736 addr->message
737 ? addr->basic_errno > 0
738 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
739 : string_copy(addr->message)
740 : addr->basic_errno > 0
741 ? string_copy(US strerror(addr->basic_errno))
742 : NULL);
743
744deliver_localpart = save_local;
745deliver_domain = save_domain;
d68218c7
JH
746router_name = transport_name = NULL;
747}
748#endif
749
0756eb3c 750/*************************************************
ee8b8090
JH
751* Reap SMTP specific responses *
752*************************************************/
753static int
754smtp_discard_responses(smtp_context * sx, smtp_transport_options_block * ob,
755 int count)
756{
757uschar flushbuffer[4096];
758
759while (count-- > 0)
760 {
761 if (!smtp_read_response(sx, flushbuffer, sizeof(flushbuffer),
762 '2', ob->command_timeout)
763 && (errno != 0 || flushbuffer[0] == 0))
764 break;
765 }
766return count;
767}
768
769
770/* Return boolean success */
771
772static BOOL
773smtp_reap_banner(smtp_context * sx)
774{
775BOOL good_response = smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
776 '2', (SOB sx->conn_args.ob)->command_timeout);
777#ifdef EXPERIMENTAL_DSN_INFO
778sx->smtp_greeting = string_copy(sx->buffer);
779#endif
780return good_response;
781}
782
783static BOOL
784smtp_reap_ehlo(smtp_context * sx)
785{
786if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
787 (SOB sx->conn_args.ob)->command_timeout))
788 {
789 if (errno != 0 || sx->buffer[0] == 0 || sx->lmtp)
790 {
791#ifdef EXPERIMENTAL_DSN_INFO
792 sx->helo_response = string_copy(sx->buffer);
793#endif
794 return FALSE;
795 }
796 sx->esmtp = FALSE;
797 }
798#ifdef EXPERIMENTAL_DSN_INFO
799sx->helo_response = string_copy(sx->buffer);
800#endif
8e78571a
JH
801#ifndef DISABLE_EVENT
802(void) event_raise(sx->conn_args.tblock->event_action,
803 US"smtp:ehlo", sx->buffer);
804#endif
ee8b8090
JH
805return TRUE;
806}
807
808
809
81344b40 810#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
811static uschar *
812ehlo_cache_key(const smtp_context * sx)
813{
814host_item * host = sx->conn_args.host;
815return Ustrchr(host->address, ':')
816 ? string_sprintf("[%s]:%d.EHLO", host->address,
817 host->port == PORT_NONE ? sx->port : host->port)
818 : string_sprintf("%s:%d.EHLO", host->address,
819 host->port == PORT_NONE ? sx->port : host->port);
820}
821
822static void
823write_ehlo_cache_entry(const smtp_context * sx)
824{
825open_db dbblock, * dbm_file;
826
b10c87b3 827if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
ee8b8090
JH
828 {
829 uschar * ehlo_resp_key = ehlo_cache_key(sx);
830 dbdata_ehlo_resp er = { .data = sx->ehlo_resp };
831
cb6bd80f
JH
832 HDEBUG(D_transport) debug_printf("writing clr %04x/%04x cry %04x/%04x\n",
833 sx->ehlo_resp.cleartext_features, sx->ehlo_resp.cleartext_auths,
834 sx->ehlo_resp.crypted_features, sx->ehlo_resp.crypted_auths);
835
ee8b8090
JH
836 dbfn_write(dbm_file, ehlo_resp_key, &er, (int)sizeof(er));
837 dbfn_close(dbm_file);
838 }
839}
840
841static void
842invalidate_ehlo_cache_entry(smtp_context * sx)
843{
844open_db dbblock, * dbm_file;
845
846if ( sx->early_pipe_active
b10c87b3 847 && (dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
ee8b8090
JH
848 {
849 uschar * ehlo_resp_key = ehlo_cache_key(sx);
850 dbfn_delete(dbm_file, ehlo_resp_key);
851 dbfn_close(dbm_file);
852 }
853}
854
855static BOOL
856read_ehlo_cache_entry(smtp_context * sx)
857{
858open_db dbblock;
859open_db * dbm_file;
860
b10c87b3 861if (!(dbm_file = dbfn_open(US"misc", O_RDONLY, &dbblock, FALSE, TRUE)))
ee8b8090
JH
862 { DEBUG(D_transport) debug_printf("ehlo-cache: no misc DB\n"); }
863else
864 {
865 uschar * ehlo_resp_key = ehlo_cache_key(sx);
866 dbdata_ehlo_resp * er;
867
868 if (!(er = dbfn_read(dbm_file, ehlo_resp_key)))
869 { DEBUG(D_transport) debug_printf("no ehlo-resp record\n"); }
870 else if (time(NULL) - er->time_stamp > retry_data_expire)
871 {
872 DEBUG(D_transport) debug_printf("ehlo-resp record too old\n");
873 dbfn_close(dbm_file);
b10c87b3 874 if ((dbm_file = dbfn_open(US"misc", O_RDWR, &dbblock, TRUE, TRUE)))
ee8b8090
JH
875 dbfn_delete(dbm_file, ehlo_resp_key);
876 }
877 else
878 {
879 sx->ehlo_resp = er->data;
880 dbfn_close(dbm_file);
881 DEBUG(D_transport) debug_printf(
d1dc7725
JH
882 "EHLO response bits from cache: cleartext 0x%04x/0x%04x crypted 0x%04x/0x%04x\n",
883 er->data.cleartext_features, er->data.cleartext_auths,
884 er->data.crypted_features, er->data.crypted_auths);
ee8b8090
JH
885 return TRUE;
886 }
887 dbfn_close(dbm_file);
888 }
889return FALSE;
890}
891
892
893
894/* Return an auths bitmap for the set of AUTH methods offered by the server
895which match our authenticators. */
896
897static unsigned short
898study_ehlo_auths(smtp_context * sx)
899{
900uschar * names;
901auth_instance * au;
902uschar authnum;
903unsigned short authbits = 0;
904
905if (!sx->esmtp) return 0;
906if (!regex_AUTH) regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
907if (!regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)) return 0;
908expand_nmax = -1; /* reset */
909names = string_copyn(expand_nstring[1], expand_nlength[1]);
910
911for (au = auths, authnum = 0; au; au = au->next, authnum++) if (au->client)
912 {
913 const uschar * list = names;
914 int sep = ' ';
915 uschar name[32];
916
917 while (string_nextinlist(&list, &sep, name, sizeof(name)))
918 if (strcmpic(au->public_name, name) == 0)
919 { authbits |= BIT(authnum); break; }
920 }
921
922DEBUG(D_transport)
923 debug_printf("server offers %s AUTH, methods '%s', bitmap 0x%04x\n",
924 tls_out.active.sock >= 0 ? "crypted" : "plaintext", names, authbits);
925
926if (tls_out.active.sock >= 0)
927 sx->ehlo_resp.crypted_auths = authbits;
928else
929 sx->ehlo_resp.cleartext_auths = authbits;
930return authbits;
931}
932
933
934
935
936/* Wait for and check responses for early-pipelining.
937
938Called from the lower-level smtp_read_response() function
939used for general code that assume synchronisation, if context
940flags indicate outstanding early-pipelining commands. Also
941called fom sync_responses() which handles pipelined commands.
942
943Arguments:
944 sx smtp connection context
945 countp number of outstanding responses, adjusted on return
946
947Return:
948 OK all well
fc243e94 949 DEFER error on first read of TLS'd conn
ee8b8090
JH
950 FAIL SMTP error in response
951*/
952int
953smtp_reap_early_pipe(smtp_context * sx, int * countp)
954{
955BOOL pending_BANNER = sx->pending_BANNER;
956BOOL pending_EHLO = sx->pending_EHLO;
fc243e94 957int rc = FAIL;
ee8b8090
JH
958
959sx->pending_BANNER = FALSE; /* clear early to avoid recursion */
960sx->pending_EHLO = FALSE;
961
962if (pending_BANNER)
963 {
964 DEBUG(D_transport) debug_printf("%s expect banner\n", __FUNCTION__);
965 (*countp)--;
966 if (!smtp_reap_banner(sx))
967 {
968 DEBUG(D_transport) debug_printf("bad banner\n");
fc243e94 969 if (tls_out.active.sock >= 0) rc = DEFER;
ee8b8090
JH
970 goto fail;
971 }
972 }
973
974if (pending_EHLO)
975 {
976 unsigned peer_offered;
977 unsigned short authbits = 0, * ap;
978
979 DEBUG(D_transport) debug_printf("%s expect ehlo\n", __FUNCTION__);
980 (*countp)--;
981 if (!smtp_reap_ehlo(sx))
982 {
983 DEBUG(D_transport) debug_printf("bad response for EHLO\n");
fc243e94 984 if (tls_out.active.sock >= 0) rc = DEFER;
ee8b8090
JH
985 goto fail;
986 }
987
988 /* Compare the actual EHLO response to the cached value we assumed;
989 on difference, dump or rewrite the cache and arrange for a retry. */
990
991 ap = tls_out.active.sock < 0
992 ? &sx->ehlo_resp.cleartext_auths : &sx->ehlo_resp.crypted_auths;
993
994 peer_offered = ehlo_response(sx->buffer,
9883af72 995 (tls_out.active.sock < 0 ? OPTION_TLS : 0)
ee8b8090
JH
996 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
997 | OPTION_UTF8 | OPTION_EARLY_PIPE
998 );
999 if ( peer_offered != sx->peer_offered
1000 || (authbits = study_ehlo_auths(sx)) != *ap)
1001 {
1002 HDEBUG(D_transport)
cb6bd80f
JH
1003 debug_printf("EHLO %s extensions changed, 0x%04x/0x%04x -> 0x%04x/0x%04x\n",
1004 tls_out.active.sock < 0 ? "cleartext" : "crypted",
ee8b8090 1005 sx->peer_offered, *ap, peer_offered, authbits);
cb6bd80f
JH
1006 *(tls_out.active.sock < 0
1007 ? &sx->ehlo_resp.cleartext_features : &sx->ehlo_resp.crypted_features) = peer_offered;
ee8b8090
JH
1008 *ap = authbits;
1009 if (peer_offered & OPTION_EARLY_PIPE)
1010 write_ehlo_cache_entry(sx);
1011 else
1012 invalidate_ehlo_cache_entry(sx);
1013
1014 return OK; /* just carry on */
1015 }
1016 }
1017return OK;
1018
1019fail:
1020 invalidate_ehlo_cache_entry(sx);
1021 (void) smtp_discard_responses(sx, sx->conn_args.ob, *countp);
fc243e94 1022 return rc;
ee8b8090
JH
1023}
1024#endif
1025
1026
1027/*************************************************
0756eb3c
PH
1028* Synchronize SMTP responses *
1029*************************************************/
1030
1031/* This function is called from smtp_deliver() to receive SMTP responses from
1032the server, and match them up with the commands to which they relate. When
1033PIPELINING is not in use, this function is called after every command, and is
1034therefore somewhat over-engineered, but it is simpler to use a single scheme
1035that works both with and without PIPELINING instead of having two separate sets
1036of code.
1037
1038The set of commands that are buffered up with pipelining may start with MAIL
1039and may end with DATA; in between are RCPT commands that correspond to the
1040addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
1041etc.) are never buffered.
1042
1043Errors after MAIL or DATA abort the whole process leaving the response in the
1044buffer. After MAIL, pending responses are flushed, and the original command is
1045re-instated in big_buffer for error messages. For RCPT commands, the remote is
1046permitted to reject some recipient addresses while accepting others. However
1047certain errors clearly abort the whole process. Set the value in
1048transport_return to PENDING_OK if the address is accepted. If there is a
1049subsequent general error, it will get reset accordingly. If not, it will get
1050converted to OK at the end.
1051
1052Arguments:
df5b41e3 1053 sx smtp connection context
48c7f9e2 1054 count the number of responses to read
48c7f9e2
PH
1055 pending_DATA 0 if last command sent was not DATA
1056 +1 if previously had a good recipient
1057 -1 if not previously had a good recipient
0756eb3c
PH
1058
1059Returns: 3 if at least one address had 2xx and one had 5xx
1060 2 if at least one address had 5xx but none had 2xx
1061 1 if at least one host had a 2xx response, but none had 5xx
1062 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
1063 -1 timeout while reading RCPT response
1064 -2 I/O or other non-response error for RCPT
1065 -3 DATA or MAIL failed - errno and buffer set
ee8b8090 1066 -4 banner or EHLO failed (early-pipelining)
fc243e94 1067 -5 banner or EHLO failed (early-pipelining, TLS)
0756eb3c
PH
1068*/
1069
1070static int
df5b41e3 1071sync_responses(smtp_context * sx, int count, int pending_DATA)
0756eb3c 1072{
ee8b8090
JH
1073address_item * addr = sx->sync_addr;
1074smtp_transport_options_block * ob = sx->conn_args.ob;
0756eb3c
PH
1075int yield = 0;
1076
81344b40 1077#ifndef DISABLE_PIPE_CONNECT
dca6d121 1078int rc;
fc243e94
JH
1079if ((rc = smtp_reap_early_pipe(sx, &count)) != OK)
1080 return rc == FAIL ? -4 : -5;
ee8b8090
JH
1081#endif
1082
0756eb3c
PH
1083/* Handle the response for a MAIL command. On error, reinstate the original
1084command in big_buffer for error message use, and flush any further pending
1085responses before returning, except after I/O errors and timeouts. */
1086
df5b41e3 1087if (sx->pending_MAIL)
0756eb3c 1088 {
7c576fca 1089 DEBUG(D_transport) debug_printf("%s expect mail\n", __FUNCTION__);
0756eb3c 1090 count--;
c4639661 1091 sx->pending_MAIL = FALSE;
251b9eb4 1092 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
e9166683 1093 '2', ob->command_timeout))
0756eb3c 1094 {
e027f545 1095 DEBUG(D_transport) debug_printf("bad response for MAIL\n");
0756eb3c 1096 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
fc243e94
JH
1097 if (errno == ERRNO_TLSFAILURE)
1098 return -5;
df5b41e3 1099 if (errno == 0 && sx->buffer[0] != 0)
0756eb3c 1100 {
e97957bc 1101 int save_errno = 0;
df5b41e3 1102 if (sx->buffer[0] == '4')
e97957bc
PH
1103 {
1104 save_errno = ERRNO_MAIL4XX;
df5b41e3 1105 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e97957bc 1106 }
ee8b8090 1107 count = smtp_discard_responses(sx, ob, count);
e97957bc 1108 errno = save_errno;
0756eb3c 1109 }
c562fd30
JH
1110
1111 if (pending_DATA) count--; /* Number of RCPT responses to come */
1112 while (count-- > 0) /* Mark any pending addrs with the host used */
1113 {
1114 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
ee8b8090 1115 addr->host_used = sx->conn_args.host;
c562fd30
JH
1116 addr = addr->next;
1117 }
0756eb3c
PH
1118 return -3;
1119 }
1120 }
1121
1122if (pending_DATA) count--; /* Number of RCPT responses to come */
1123
1124/* Read and handle the required number of RCPT responses, matching each one up
1125with an address by scanning for the next address whose status is PENDING_DEFER.
1126*/
1127
1128while (count-- > 0)
1129 {
4c2471ca
JH
1130 while (addr->transport_return != PENDING_DEFER)
1131 if (!(addr = addr->next))
1132 return -2;
0756eb3c
PH
1133
1134 /* The address was accepted */
ee8b8090 1135 addr->host_used = sx->conn_args.host;
0756eb3c 1136
7c576fca 1137 DEBUG(D_transport) debug_printf("%s expect rcpt\n", __FUNCTION__);
251b9eb4 1138 if (smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
e9166683 1139 '2', ob->command_timeout))
0756eb3c
PH
1140 {
1141 yield |= 1;
1142 addr->transport_return = PENDING_OK;
1143
1144 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
1145 ensure that any address-specific retry record is expunged. We do this both
1146 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
1147
1148 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
1149 {
1150 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
1151 sender_address);
1152 retry_add_item(addr, altkey, rf_delete);
0756eb3c 1153 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 1154 }
0756eb3c
PH
1155 }
1156
fc243e94
JH
1157 /* Error on first TLS read */
1158
1159 else if (errno == ERRNO_TLSFAILURE)
1160 return -5;
1161
0756eb3c
PH
1162 /* Timeout while reading the response */
1163
1164 else if (errno == ETIMEDOUT)
1165 {
c562fd30 1166 uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>",
ee8b8090 1167 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
a55697ac 1168 set_errno_nohost(sx->first_addr, ETIMEDOUT, message, DEFER, FALSE, &sx->delivery_start);
0756eb3c 1169 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 1170 update_waiting = FALSE;
0756eb3c
PH
1171 return -1;
1172 }
1173
1174 /* Handle other errors in obtaining an SMTP response by returning -1. This
1175 will cause all the addresses to be deferred. Restore the SMTP command in
1176 big_buffer for which we are checking the response, so the error message
1177 makes sense. */
1178
df5b41e3 1179 else if (errno != 0 || sx->buffer[0] == 0)
0756eb3c 1180 {
f3ebb786
JH
1181 gstring gs = { .size = big_buffer_size, .ptr = 0, .s = big_buffer }, * g = &gs;
1182
1183 /* Use taint-unchecked routines for writing into big_buffer, trusting
1184 that we'll never expand it. */
1185
1186 g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "RCPT TO:<%s>",
ee8b8090 1187 transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes));
f3ebb786 1188 string_from_gstring(g);
0756eb3c
PH
1189 return -2;
1190 }
1191
1192 /* Handle SMTP permanent and temporary response codes. */
1193
1194 else
1195 {
1196 addr->message =
447d236c 1197 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
ee8b8090 1198 "%s", transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes),
df5b41e3 1199 string_printing(sx->buffer));
447d236c 1200 setflag(addr, af_pass_message);
e9166683 1201 if (!sx->verify)
ee8b8090 1202 msglog_line(sx->conn_args.host, addr->message);
0756eb3c
PH
1203
1204 /* The response was 5xx */
1205
df5b41e3 1206 if (sx->buffer[0] == '5')
0756eb3c
PH
1207 {
1208 addr->transport_return = FAIL;
1209 yield |= 2;
1210 }
1211
1212 /* The response was 4xx */
1213
1214 else
1215 {
0756eb3c
PH
1216 addr->transport_return = DEFER;
1217 addr->basic_errno = ERRNO_RCPT4XX;
df5b41e3 1218 addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
0756eb3c 1219
e9166683
JH
1220 if (!sx->verify)
1221 {
0cbf2b82 1222#ifndef DISABLE_EVENT
e9166683
JH
1223 event_defer_errno = addr->more_errno;
1224 msg_event_raise(US"msg:rcpt:host:defer", addr);
5ef5dd52 1225#endif
c4639661
JH
1226 /* If a 452 and we've had at least one 2xx or 5xx, set next_addr to the
1227 start point for another MAIL command. */
5ef5dd52 1228
c4639661
JH
1229 if (addr->more_errno >> 8 == 52 && yield & 3)
1230 {
1231 if (!sx->RCPT_452)
1232 {
1233 DEBUG(D_transport)
1234 debug_printf("%s: seen first 452 too-many-rcpts\n", __FUNCTION__);
1235 sx->RCPT_452 = TRUE;
1236 sx->next_addr = addr;
1237 }
1238 addr->transport_return = PENDING_DEFER;
1239 addr->basic_errno = 0;
1240 }
1241 else
1242 {
1243 /* Log temporary errors if there are more hosts to be tried.
1244 If not, log this last one in the == line. */
1245
1246 if (sx->conn_args.host->next)
1247 if (LOGGING(outgoing_port))
1248 log_write(0, LOG_MAIN, "H=%s [%s]:%d %s", sx->conn_args.host->name,
1249 sx->conn_args.host->address,
1250 sx->port == PORT_NONE ? 25 : sx->port, addr->message);
1251 else
1252 log_write(0, LOG_MAIN, "H=%s [%s]: %s", sx->conn_args.host->name,
1253 sx->conn_args.host->address, addr->message);
0756eb3c 1254
0cbf2b82 1255#ifndef DISABLE_EVENT
c4639661
JH
1256 else
1257 msg_event_raise(US"msg:rcpt:defer", addr);
5ef5dd52
JB
1258#endif
1259
c4639661
JH
1260 /* Do not put this message on the list of those waiting for specific
1261 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 1262
c4639661 1263 update_waiting = FALSE;
0756eb3c 1264
c4639661
JH
1265 /* Add a retry item for the address so that it doesn't get tried again
1266 too soon. If address_retry_include_sender is true, add the sender address
1267 to the retry key. */
0756eb3c 1268
c4639661
JH
1269 retry_add_item(addr,
1270 ob->address_retry_include_sender
1271 ? string_sprintf("%s:<%s>", addr->address_retry_key, sender_address)
1272 : addr->address_retry_key,
1273 0);
1274 }
e9166683 1275 }
0756eb3c
PH
1276 }
1277 }
1278 } /* Loop for next RCPT response */
1279
1280/* Update where to start at for the next block of responses, unless we
1281have already handled all the addresses. */
1282
e9166683 1283if (addr) sx->sync_addr = addr->next;
0756eb3c
PH
1284
1285/* Handle a response to DATA. If we have not had any good recipients, either
1286previously or in this block, the response is ignored. */
1287
7c576fca 1288if (pending_DATA != 0)
0756eb3c 1289 {
7c576fca 1290 DEBUG(D_transport) debug_printf("%s expect data\n", __FUNCTION__);
251b9eb4 1291 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer),
7c576fca 1292 '3', ob->command_timeout))
e97957bc 1293 {
7c576fca
JH
1294 int code;
1295 uschar *msg;
1296 BOOL pass_message;
fc243e94
JH
1297
1298 if (errno == ERRNO_TLSFAILURE) /* Error on first TLS read */
1299 return -5;
1300
7c576fca 1301 if (pending_DATA > 0 || (yield & 1) != 0)
e97957bc 1302 {
7c576fca
JH
1303 if (errno == 0 && sx->buffer[0] == '4')
1304 {
1305 errno = ERRNO_DATA4XX;
1306 sx->first_addr->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
1307 }
1308 return -3;
e97957bc 1309 }
ee8b8090 1310 (void)check_response(sx->conn_args.host, &errno, 0, sx->buffer, &code, &msg, &pass_message);
7c576fca
JH
1311 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
1312 "is in use and there were no good recipients\n", msg);
e97957bc 1313 }
0756eb3c
PH
1314 }
1315
1316/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
1317present) received 3xx. If any RCPTs were handled and yielded anything other
1318than 4xx, yield will be set non-zero. */
1319
1320return yield;
1321}
1322
1323
1324
ee8b8090
JH
1325
1326
1327/* Try an authenticator's client entry */
1328
1329static int
1330try_authenticator(smtp_context * sx, auth_instance * au)
1331{
1332smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1333host_item * host = sx->conn_args.host; /* host to deliver to */
1334int rc;
1335
1336sx->outblock.authenticating = TRUE;
1337rc = (au->info->clientcode)(au, sx, ob->command_timeout,
1338 sx->buffer, sizeof(sx->buffer));
1339sx->outblock.authenticating = FALSE;
1340DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", au->name, rc);
1341
1342/* A temporary authentication failure must hold up delivery to
1343this host. After a permanent authentication failure, we carry on
1344to try other authentication methods. If all fail hard, try to
1345deliver the message unauthenticated unless require_auth was set. */
1346
1347switch(rc)
1348 {
1349 case OK:
1350 f.smtp_authenticated = TRUE; /* stops the outer loop */
1351 client_authenticator = au->name;
1352 if (au->set_client_id)
1353 client_authenticated_id = expand_string(au->set_client_id);
1354 break;
1355
1356 /* Failure after writing a command */
1357
1358 case FAIL_SEND:
1359 return FAIL_SEND;
1360
1361 /* Failure after reading a response */
1362
1363 case FAIL:
1364 if (errno != 0 || sx->buffer[0] != '5') return FAIL;
1365 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1366 au->name, host->name, host->address, sx->buffer);
1367 break;
1368
1369 /* Failure by some other means. In effect, the authenticator
1370 decided it wasn't prepared to handle this case. Typically this
1371 is the result of "fail" in an expansion string. Do we need to
1372 log anything here? Feb 2006: a message is now put in the buffer
1373 if logging is required. */
1374
1375 case CANCELLED:
1376 if (*sx->buffer != 0)
1377 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1378 "authentication H=%s [%s] %s", au->name, host->name,
1379 host->address, sx->buffer);
1380 break;
1381
1382 /* Internal problem, message in buffer. */
1383
1384 case ERROR:
1385 set_errno_nohost(sx->addrlist, ERRNO_AUTHPROB, string_copy(sx->buffer),
a55697ac 1386 DEFER, FALSE, &sx->delivery_start);
ee8b8090
JH
1387 return ERROR;
1388 }
1389return OK;
1390}
1391
1392
1393
1394
1395/* Do the client side of smtp-level authentication.
1396
fcc8e047 1397Arguments:
ee8b8090
JH
1398 sx smtp connection context
1399
1400sx->buffer should have the EHLO response from server (gets overwritten)
fcc8e047
JH
1401
1402Returns:
1403 OK Success, or failed (but not required): global "smtp_authenticated" set
1404 DEFER Failed authentication (and was required)
1405 ERROR Internal problem
1406
1407 FAIL_SEND Failed communications - transmit
1408 FAIL - response
1409*/
1410
251b9eb4 1411static int
ee8b8090 1412smtp_auth(smtp_context * sx)
fcc8e047 1413{
ee8b8090
JH
1414host_item * host = sx->conn_args.host; /* host to deliver to */
1415smtp_transport_options_block * ob = sx->conn_args.ob; /* transport options */
1416int require_auth = verify_check_given_host(CUSS &ob->hosts_require_auth, host);
81344b40 1417#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1418unsigned short authbits = tls_out.active.sock >= 0
1419 ? sx->ehlo_resp.crypted_auths : sx->ehlo_resp.cleartext_auths;
1420#endif
1421uschar * fail_reason = US"server did not advertise AUTH support";
fcc8e047 1422
8768d548 1423f.smtp_authenticated = FALSE;
a7538db1 1424client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
fcc8e047 1425
ee8b8090
JH
1426if (!regex_AUTH)
1427 regex_AUTH = regex_must_compile(AUTHS_REGEX, FALSE, TRUE);
1428
1429/* Is the server offering AUTH? */
fcc8e047 1430
ee8b8090
JH
1431if ( sx->esmtp
1432 &&
81344b40 1433#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1434 sx->early_pipe_active ? authbits
1435 :
1436#endif
1437 regex_match_and_setup(regex_AUTH, sx->buffer, 0, -1)
1438 )
a7538db1 1439 {
ee8b8090 1440 uschar * names = NULL;
a7538db1 1441 expand_nmax = -1; /* reset */
fcc8e047 1442
81344b40 1443#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1444 if (!sx->early_pipe_active)
1445#endif
1446 names = string_copyn(expand_nstring[1], expand_nlength[1]);
1447
a7538db1 1448 /* Must not do this check until after we have saved the result of the
ee8b8090 1449 regex match above as the check could be another RE. */
fcc8e047 1450
ee8b8090
JH
1451 if ( require_auth == OK
1452 || verify_check_given_host(CUSS &ob->hosts_try_auth, host) == OK)
a7538db1 1453 {
a7538db1 1454 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
ee8b8090
JH
1455 fail_reason = US"no common mechanisms were found";
1456
81344b40 1457#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1458 if (sx->early_pipe_active)
1459 {
1460 /* Scan our authenticators (which support use by a client and were offered
1461 by the server (checked at cache-write time)), not suppressed by
1462 client_condition. If one is found, attempt to authenticate by calling its
1463 client function. We are limited to supporting up to 16 authenticator
1464 public-names by the number of bits in a short. */
1465
dca6d121 1466 auth_instance * au;
ee8b8090
JH
1467 uschar bitnum;
1468 int rc;
1469
1470 for (bitnum = 0, au = auths;
1471 !f.smtp_authenticated && au && bitnum < 16;
1472 bitnum++, au = au->next) if (authbits & BIT(bitnum))
1473 {
1474 if ( au->client_condition
1475 && !expand_check_condition(au->client_condition, au->name,
1476 US"client authenticator"))
1477 {
1478 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1479 au->name, "client_condition is false");
1480 continue;
1481 }
1482
1483 /* Found data for a listed mechanism. Call its client entry. Set
1484 a flag in the outblock so that data is overwritten after sending so
1485 that reflections don't show it. */
1486
1487 fail_reason = US"authentication attempt(s) failed";
1488
1489 if ((rc = try_authenticator(sx, au)) != OK)
1490 return rc;
1491 }
1492 }
1493 else
1494#endif
fcc8e047 1495
a7538db1
JH
1496 /* Scan the configured authenticators looking for one which is configured
1497 for use as a client, which is not suppressed by client_condition, and
1498 whose name matches an authentication mechanism supported by the server.
1499 If one is found, attempt to authenticate by calling its client function.
1500 */
fcc8e047 1501
d7978c0f 1502 for (auth_instance * au = auths; !f.smtp_authenticated && au; au = au->next)
a7538db1
JH
1503 {
1504 uschar *p = names;
ee8b8090
JH
1505
1506 if ( !au->client
1507 || ( au->client_condition
1508 && !expand_check_condition(au->client_condition, au->name,
1509 US"client authenticator")))
a7538db1
JH
1510 {
1511 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
1512 au->name,
1513 (au->client)? "client_condition is false" :
1514 "not configured as a client");
1515 continue;
1516 }
fcc8e047 1517
a7538db1 1518 /* Loop to scan supported server mechanisms */
fcc8e047 1519
cab0c277 1520 while (*p)
a7538db1 1521 {
a7538db1 1522 int len = Ustrlen(au->public_name);
ee8b8090
JH
1523 int rc;
1524
a7538db1 1525 while (isspace(*p)) p++;
fcc8e047 1526
a7538db1
JH
1527 if (strncmpic(au->public_name, p, len) != 0 ||
1528 (p[len] != 0 && !isspace(p[len])))
1529 {
1530 while (*p != 0 && !isspace(*p)) p++;
1531 continue;
1532 }
fcc8e047 1533
a7538db1
JH
1534 /* Found data for a listed mechanism. Call its client entry. Set
1535 a flag in the outblock so that data is overwritten after sending so
1536 that reflections don't show it. */
fcc8e047 1537
a7538db1 1538 fail_reason = US"authentication attempt(s) failed";
a7538db1 1539
ee8b8090
JH
1540 if ((rc = try_authenticator(sx, au)) != OK)
1541 return rc;
fcc8e047 1542
a7538db1
JH
1543 break; /* If not authenticated, try next authenticator */
1544 } /* Loop for scanning supported server mechanisms */
1545 } /* Loop for further authenticators */
fcc8e047 1546 }
a7538db1 1547 }
fcc8e047 1548
a7538db1 1549/* If we haven't authenticated, but are required to, give up. */
fcc8e047 1550
8768d548 1551if (require_auth == OK && !f.smtp_authenticated)
a7538db1 1552 {
251b9eb4 1553 set_errno_nohost(sx->addrlist, ERRNO_AUTHFAIL,
a7538db1 1554 string_sprintf("authentication required but %s", fail_reason), DEFER,
a55697ac 1555 FALSE, &sx->delivery_start);
a7538db1
JH
1556 return DEFER;
1557 }
4d8d62b9 1558
a7538db1 1559return OK;
fcc8e047
JH
1560}
1561
1562
1563/* Construct AUTH appendix string for MAIL TO */
1564/*
1565Arguments
a55697ac
JH
1566 sx context for smtp connection
1567 p point in sx->buffer to build string
fcc8e047 1568 addrlist chain of potential addresses to deliver
fcc8e047 1569
8768d548 1570Globals f.smtp_authenticated
fcc8e047
JH
1571 client_authenticated_sender
1572Return True on error, otherwise buffer has (possibly empty) terminated string
1573*/
1574
f3ebb786 1575static BOOL
a55697ac 1576smtp_mail_auth_str(smtp_context * sx, uschar * p, address_item * addrlist)
fcc8e047 1577{
a55697ac 1578smtp_transport_options_block * ob = sx->conn_args.ob;
f3ebb786 1579uschar * local_authenticated_sender = authenticated_sender;
fcc8e047
JH
1580
1581#ifdef notdef
a55697ac
JH
1582 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n",
1583 authenticated_sender, ob->authenticated_sender, f.smtp_authenticated?"Y":"N");
fcc8e047
JH
1584#endif
1585
f3ebb786 1586if (ob->authenticated_sender)
fcc8e047 1587 {
a55697ac 1588 uschar * new = expand_string(ob->authenticated_sender);
f3ebb786 1589 if (!new)
fcc8e047 1590 {
8768d548 1591 if (!f.expand_string_forcedfail)
fcc8e047
JH
1592 {
1593 uschar *message = string_sprintf("failed to expand "
1594 "authenticated_sender: %s", expand_string_message);
a55697ac 1595 set_errno_nohost(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
fcc8e047
JH
1596 return TRUE;
1597 }
1598 }
a55697ac
JH
1599 else if (*new)
1600 local_authenticated_sender = new;
fcc8e047
JH
1601 }
1602
1603/* Add the authenticated sender address if present */
1604
f3ebb786
JH
1605if ( (f.smtp_authenticated || ob->authenticated_sender_force)
1606 && local_authenticated_sender)
fcc8e047 1607 {
a55697ac 1608 string_format_nt(p, sizeof(sx->buffer) - (p-sx->buffer), " AUTH=%s",
fcc8e047 1609 auth_xtextencode(local_authenticated_sender,
f3ebb786 1610 Ustrlen(local_authenticated_sender)));
fcc8e047
JH
1611 client_authenticated_sender = string_copy(local_authenticated_sender);
1612 }
1613else
a55697ac 1614 *p = 0;
fcc8e047
JH
1615
1616return FALSE;
1617}
1618
1619
1620
a39bd74d
JB
1621typedef struct smtp_compare_s
1622{
1623 uschar *current_sender_address;
1624 struct transport_instance *tblock;
1625} smtp_compare_t;
1626
d093f8e5
JH
1627
1628/* Create a unique string that identifies this message, it is based on
1629sender_address, helo_data and tls_certificate if enabled.
1630*/
a39bd74d
JB
1631
1632static uschar *
1633smtp_local_identity(uschar * sender, struct transport_instance * tblock)
1634{
1635address_item * addr1;
1636uschar * if1 = US"";
1637uschar * helo1 = US"";
01603eec 1638#ifndef DISABLE_TLS
a39bd74d
JB
1639uschar * tlsc1 = US"";
1640#endif
1641uschar * save_sender_address = sender_address;
1642uschar * local_identity = NULL;
ee8b8090 1643smtp_transport_options_block * ob = SOB tblock->options_block;
a39bd74d
JB
1644
1645sender_address = sender;
1646
1647addr1 = deliver_make_addr (sender, TRUE);
1648deliver_set_expansions(addr1);
1649
1650if (ob->interface)
1651 if1 = expand_string(ob->interface);
1652
1653if (ob->helo_data)
1654 helo1 = expand_string(ob->helo_data);
1655
01603eec 1656#ifndef DISABLE_TLS
a39bd74d
JB
1657if (ob->tls_certificate)
1658 tlsc1 = expand_string(ob->tls_certificate);
1659local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
1660#else
1661local_identity = string_sprintf ("%s^%s", if1, helo1);
1662#endif
1663
1664deliver_set_expansions(NULL);
1665sender_address = save_sender_address;
1666
1667return local_identity;
1668}
1669
1670
1671
1672/* This routine is a callback that is called from transport_check_waiting.
1673This function will evaluate the incoming message versus the previous
1674message. If the incoming message is using a different local identity then
1675we will veto this new message. */
1676
1677static BOOL
1678smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
1679{
dadff1d4
HSHR
1680uschar * message_local_identity,
1681 * current_local_identity,
1682 * new_sender_address;
1683
1684current_local_identity =
a39bd74d 1685 smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
a39bd74d 1686
dadff1d4 1687if (!(new_sender_address = deliver_get_sender_address(message_id)))
96c81511 1688 return FALSE;
dadff1d4
HSHR
1689
1690message_local_identity =
1691 smtp_local_identity(new_sender_address, s_compare->tblock);
a39bd74d
JB
1692
1693return Ustrcmp(current_local_identity, message_local_identity) == 0;
1694}
1695
1696
1697
8ac90765
JH
1698static unsigned
1699ehlo_response(uschar * buf, unsigned checks)
9094b84b 1700{
e9166683
JH
1701size_t bsize = Ustrlen(buf);
1702
ee8b8090 1703/* debug_printf("%s: check for 0x%04x\n", __FUNCTION__, checks); */
8ac90765 1704
01603eec 1705#ifndef DISABLE_TLS
ee8b8090
JH
1706if ( checks & OPTION_TLS
1707 && pcre_exec(regex_STARTTLS, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
9094b84b 1708#endif
ee8b8090 1709 checks &= ~OPTION_TLS;
9094b84b 1710
14de8063 1711if ( checks & OPTION_IGNQ
ff5aac2b
JH
1712 && pcre_exec(regex_IGNOREQUOTA, NULL, CS buf, bsize, 0,
1713 PCRE_EOPT, NULL, 0) < 0)
14de8063 1714 checks &= ~OPTION_IGNQ;
9094b84b 1715
14de8063 1716if ( checks & OPTION_CHUNKING
f98442df 1717 && pcre_exec(regex_CHUNKING, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1718 checks &= ~OPTION_CHUNKING;
f98442df 1719
9094b84b 1720#ifndef DISABLE_PRDR
14de8063 1721if ( checks & OPTION_PRDR
ff5aac2b 1722 && pcre_exec(regex_PRDR, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
9094b84b 1723#endif
ee8b8090 1724 checks &= ~OPTION_PRDR;
9094b84b
JH
1725
1726#ifdef SUPPORT_I18N
14de8063 1727if ( checks & OPTION_UTF8
ff5aac2b 1728 && pcre_exec(regex_UTF8, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
9094b84b 1729#endif
ee8b8090 1730 checks &= ~OPTION_UTF8;
9094b84b 1731
14de8063 1732if ( checks & OPTION_DSN
ff5aac2b 1733 && pcre_exec(regex_DSN, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1734 checks &= ~OPTION_DSN;
9094b84b 1735
14de8063 1736if ( checks & OPTION_PIPE
ff5aac2b
JH
1737 && pcre_exec(regex_PIPELINING, NULL, CS buf, bsize, 0,
1738 PCRE_EOPT, NULL, 0) < 0)
14de8063 1739 checks &= ~OPTION_PIPE;
9094b84b 1740
14de8063 1741if ( checks & OPTION_SIZE
ff5aac2b 1742 && pcre_exec(regex_SIZE, NULL, CS buf, bsize, 0, PCRE_EOPT, NULL, 0) < 0)
14de8063 1743 checks &= ~OPTION_SIZE;
9094b84b 1744
81344b40 1745#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1746if ( checks & OPTION_EARLY_PIPE
1747 && pcre_exec(regex_EARLY_PIPE, NULL, CS buf, bsize, 0,
1748 PCRE_EOPT, NULL, 0) < 0)
1749#endif
1750 checks &= ~OPTION_EARLY_PIPE;
1751
1752/* debug_printf("%s: found 0x%04x\n", __FUNCTION__, checks); */
9094b84b
JH
1753return checks;
1754}
1755
1756
6d5c916c
JH
1757
1758/* Callback for emitting a BDAT data chunk header.
6d5c916c 1759
e027f545
JH
1760If given a nonzero size, first flush any buffered SMTP commands
1761then emit the command.
1762
d2aa036b
JH
1763Reap previous SMTP command responses if requested, and always reap
1764the response from a previous BDAT command.
1765
1766Args:
1767 tctx transport context
1768 chunk_size value for SMTP BDAT command
1769 flags
1770 tc_chunk_last add LAST option to SMTP BDAT command
1771 tc_reap_prev reap response to previous SMTP commands
6d5c916c 1772
fc243e94
JH
1773Returns:
1774 OK or ERROR
1775 DEFER TLS error on first read (EHLO-resp); errno set
6d5c916c
JH
1776*/
1777
1778static int
d2aa036b
JH
1779smtp_chunk_cmd_callback(transport_ctx * tctx, unsigned chunk_size,
1780 unsigned flags)
6d5c916c 1781{
ee8b8090 1782smtp_transport_options_block * ob = SOB tctx->tblock->options_block;
e9166683 1783smtp_context * sx = tctx->smtp_context;
e027f545
JH
1784int cmd_count = 0;
1785int prev_cmd_count;
6d5c916c 1786
4e910c01
JH
1787/* Write SMTP chunk header command. If not reaping responses, note that
1788there may be more writes (like, the chunk data) done soon. */
6d5c916c 1789
e027f545 1790if (chunk_size > 0)
87cb4a16 1791 {
81344b40 1792#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1793 BOOL new_conn = !!(sx->outblock.conn_args);
1794#endif
251b9eb4 1795 if((cmd_count = smtp_write_command(sx,
4e910c01
JH
1796 flags & tc_reap_prev ? SCMD_FLUSH : SCMD_MORE,
1797 "BDAT %u%s\r\n", chunk_size, flags & tc_chunk_last ? " LAST" : "")
e027f545 1798 ) < 0) return ERROR;
87cb4a16
JH
1799 if (flags & tc_chunk_last)
1800 data_command = string_copy(big_buffer); /* Save for later error message */
81344b40 1801#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1802 /* That command write could have been the one that made the connection.
1803 Copy the fd from the client conn ctx (smtp transport specific) to the
1804 generic transport ctx. */
1805
1806 if (new_conn)
1807 tctx->u.fd = sx->outblock.cctx->sock;
1808#endif
87cb4a16 1809 }
e027f545 1810
e9166683 1811prev_cmd_count = cmd_count += sx->cmd_count;
6d5c916c 1812
e027f545 1813/* Reap responses for any previous, but not one we just emitted */
6d5c916c 1814
e027f545
JH
1815if (chunk_size > 0)
1816 prev_cmd_count--;
e9166683 1817if (sx->pending_BDAT)
e027f545 1818 prev_cmd_count--;
6d5c916c 1819
e027f545 1820if (flags & tc_reap_prev && prev_cmd_count > 0)
6d5c916c 1821 {
58fc5fb2
JH
1822 DEBUG(D_transport) debug_printf("look for %d responses"
1823 " for previous pipelined cmds\n", prev_cmd_count);
6d5c916c 1824
e9166683 1825 switch(sync_responses(sx, prev_cmd_count, 0))
e027f545
JH
1826 {
1827 case 1: /* 2xx (only) => OK */
e9166683
JH
1828 case 3: sx->good_RCPT = TRUE; /* 2xx & 5xx => OK & progress made */
1829 case 2: sx->completed_addr = TRUE; /* 5xx (only) => progress made */
e027f545
JH
1830 case 0: break; /* No 2xx or 5xx, but no probs */
1831
fc243e94
JH
1832 case -5: errno = ERRNO_TLSFAILURE;
1833 return DEFER;
81344b40 1834#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
1835 case -4: /* non-2xx for pipelined banner or EHLO */
1836#endif
fc243e94 1837 case -1: /* Timeout on RCPT */
e027f545
JH
1838 default: return ERROR; /* I/O error, or any MAIL/DATA error */
1839 }
1840 cmd_count = 1;
e9166683 1841 if (!sx->pending_BDAT)
e027f545 1842 pipelining_active = FALSE;
6d5c916c 1843 }
e027f545 1844
58fc5fb2 1845/* Reap response for an outstanding BDAT */
e027f545 1846
e9166683 1847if (sx->pending_BDAT)
e027f545 1848 {
58fc5fb2
JH
1849 DEBUG(D_transport) debug_printf("look for one response for BDAT\n");
1850
251b9eb4 1851 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
e027f545
JH
1852 ob->command_timeout))
1853 {
e9166683 1854 if (errno == 0 && sx->buffer[0] == '4')
e027f545
JH
1855 {
1856 errno = ERRNO_DATA4XX; /*XXX does this actually get used? */
36e55f49 1857 sx->addrlist->more_errno |=
e9166683 1858 ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
e027f545
JH
1859 }
1860 return ERROR;
1861 }
1862 cmd_count--;
e9166683 1863 sx->pending_BDAT = FALSE;
e027f545
JH
1864 pipelining_active = FALSE;
1865 }
1866else if (chunk_size > 0)
e9166683 1867 sx->pending_BDAT = TRUE;
e027f545
JH
1868
1869
e9166683 1870sx->cmd_count = cmd_count;
e027f545 1871return OK;
6d5c916c
JH
1872}
1873
1874
1875
ee8b8090
JH
1876
1877
0756eb3c 1878/*************************************************
d093f8e5 1879* Make connection for given message *
0756eb3c
PH
1880*************************************************/
1881
d093f8e5
JH
1882/*
1883Arguments:
1884 ctx connection context
d093f8e5
JH
1885 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1886 a second attempt after TLS initialization fails
d093f8e5
JH
1887
1888Returns: OK - the connection was made and the delivery attempted;
1889 fd is set in the conn context, tls_out set up.
1890 DEFER - the connection could not be made, or something failed
1891 while setting up the SMTP session, or there was a
1892 non-message-specific error, such as a timeout.
1893 ERROR - helo_data or add_headers or authenticated_sender is
1894 specified for this transport, and the string failed
1895 to expand
1896*/
1897int
e9166683 1898smtp_setup_conn(smtp_context * sx, BOOL suppress_tls)
d093f8e5 1899{
ee8b8090 1900smtp_transport_options_block * ob = sx->conn_args.tblock->options_block;
d093f8e5 1901BOOL pass_message = FALSE;
d093f8e5 1902uschar * message = NULL;
d093f8e5 1903int yield = OK;
01603eec 1904#ifndef DISABLE_TLS
fc243e94
JH
1905uschar * tls_errstr;
1906#endif
d093f8e5 1907
ee8b8090 1908sx->conn_args.ob = ob;
d093f8e5 1909
ee8b8090
JH
1910sx->lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
1911sx->smtps = strcmpic(ob->protocol, US"smtps") == 0;
de41aff0 1912/* sx->ok = FALSE; */
d093f8e5
JH
1913sx->send_rset = TRUE;
1914sx->send_quit = TRUE;
1915sx->setting_up = TRUE;
1916sx->esmtp = TRUE;
de41aff0 1917/* sx->esmtp_sent = FALSE; */
59a286ef 1918#ifdef SUPPORT_I18N
de41aff0 1919/* sx->utf8_needed = FALSE; */
59a286ef 1920#endif
d093f8e5 1921sx->dsn_all_lasthop = TRUE;
21ee816d 1922#ifdef SUPPORT_DANE
de41aff0 1923/* sx->conn_args.dane = FALSE; */
8ac90765 1924sx->dane_required =
ee8b8090
JH
1925 verify_check_given_host(CUSS &ob->hosts_require_dane, sx->conn_args.host) == OK;
1926#endif
81344b40 1927#ifndef DISABLE_PIPE_CONNECT
de41aff0
JH
1928/* sx->early_pipe_active = sx->early_pipe_ok = FALSE; */
1929/* sx->ehlo_resp.cleartext_features = sx->ehlo_resp.crypted_features = 0; */
1930/* sx->pending_BANNER = sx->pending_EHLO = sx->pending_MAIL = FALSE; */
d093f8e5
JH
1931#endif
1932
ee8b8090 1933if ((sx->max_rcpt = sx->conn_args.tblock->max_addresses) == 0) sx->max_rcpt = 999999;
de41aff0
JH
1934/* sx->peer_offered = 0; */
1935/* sx->avoid_option = 0; */
d093f8e5 1936sx->igquotstr = US"";
ee8b8090 1937if (!sx->helo_data) sx->helo_data = ob->helo_data;
d093f8e5 1938#ifdef EXPERIMENTAL_DSN_INFO
de41aff0
JH
1939/* sx->smtp_greeting = NULL; */
1940/* sx->helo_response = NULL; */
59a286ef
JH
1941#endif
1942
0756eb3c 1943smtp_command = US"initial connection";
de41aff0 1944/* sx->buffer[0] = '\0'; */
0756eb3c
PH
1945
1946/* Set up the buffer for reading SMTP response packets. */
1947
d093f8e5
JH
1948sx->inblock.buffer = sx->inbuffer;
1949sx->inblock.buffersize = sizeof(sx->inbuffer);
1950sx->inblock.ptr = sx->inbuffer;
1951sx->inblock.ptrend = sx->inbuffer;
0756eb3c
PH
1952
1953/* Set up the buffer for holding SMTP commands while pipelining */
1954
d093f8e5
JH
1955sx->outblock.buffer = sx->outbuffer;
1956sx->outblock.buffersize = sizeof(sx->outbuffer);
1957sx->outblock.ptr = sx->outbuffer;
de41aff0
JH
1958/* sx->outblock.cmd_count = 0; */
1959/* sx->outblock.authenticating = FALSE; */
1960/* sx->outblock.conn_args = NULL; */
0756eb3c 1961
6c512171
PH
1962/* Reset the parameters of a TLS session. */
1963
817d9f57
JH
1964tls_out.bits = 0;
1965tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1966tls_out.ourcert = NULL;
1967tls_out.peercert = NULL;
817d9f57 1968tls_out.peerdn = NULL;
de517fd3 1969#ifdef USE_OPENSSL
817d9f57 1970tls_out.sni = NULL;
5b456975 1971#endif
018058b2 1972tls_out.ocsp = OCSP_NOT_REQ;
b10c87b3
JH
1973#ifdef EXPERIMENTAL_TLS_RESUME
1974tls_out.resumption = 0;
1975#endif
da40b1ec 1976tls_out.ver = NULL;
6c512171 1977
35aba663
JH
1978/* Flip the legacy TLS-related variables over to the outbound set in case
1979they're used in the context of the transport. Don't bother resetting
02b41d71
JH
1980afterward (when being used by a transport) as we're in a subprocess.
1981For verify, unflipped once the callout is dealt with */
35aba663
JH
1982
1983tls_modify_variables(&tls_out);
1984
01603eec 1985#ifdef DISABLE_TLS
d093f8e5 1986if (sx->smtps)
061b7ebd 1987 {
d093f8e5 1988 set_errno_nohost(sx->addrlist, ERRNO_TLSFAILURE, US"TLS support not available",
a55697ac 1989 DEFER, FALSE, &sx->delivery_start);
018058b2 1990 return ERROR;
061b7ebd
PP
1991 }
1992#endif
1993
0756eb3c
PH
1994/* Make a connection to the host if this isn't a continued delivery, and handle
1995the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1996specially so they can be identified for retries. */
1997
58c30e47 1998if (!continue_hostname)
0756eb3c 1999 {
e9166683 2000 if (sx->verify)
ee8b8090 2001 HDEBUG(D_verify) debug_printf("interface=%s port=%d\n", sx->conn_args.interface, sx->port);
02b41d71 2002
ee8b8090 2003 /* Get the actual port the connection will use, into sx->conn_args.host */
4311097e 2004
ee8b8090 2005 smtp_port_for_connect(sx->conn_args.host, sx->port);
0756eb3c 2006
21ee816d 2007#ifdef SUPPORT_DANE
58c30e47 2008 /* Do TLSA lookup for DANE */
0e66b3b6 2009 {
0e66b3b6
JH
2010 tls_out.dane_verified = FALSE;
2011 tls_out.tlsa_usage = 0;
2012
ee8b8090 2013 if (sx->conn_args.host->dnssec == DS_YES)
0e66b3b6 2014 {
81a559c8 2015 int rc;
d093f8e5 2016 if( sx->dane_required
ee8b8090 2017 || verify_check_given_host(CUSS &ob->hosts_try_dane, sx->conn_args.host) == OK
0e66b3b6 2018 )
c05bdbd6 2019 switch (rc = tlsa_lookup(sx->conn_args.host, &sx->conn_args.tlsa_dnsa, sx->dane_required))
4b0fe319 2020 {
c05bdbd6 2021 case OK: sx->conn_args.dane = TRUE;
ee8b8090 2022 ob->tls_tempfail_tryclear = FALSE;
58c30e47 2023 break;
2d5fdd53 2024 case FAIL_FORCED: break;
d093f8e5 2025 default: set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
2d5fdd53 2026 string_sprintf("DANE error: tlsa lookup %s",
aeb65e91 2027 rc_to_string(rc)),
a55697ac 2028 rc, FALSE, &sx->delivery_start);
8d3dc239 2029# ifndef DISABLE_EVENT
ee8b8090 2030 (void) event_raise(sx->conn_args.tblock->event_action,
c4b57fdd
JH
2031 US"dane:fail", sx->dane_required
2032 ? US"dane-required" : US"dnssec-invalid");
8d3dc239 2033# endif
2d5fdd53 2034 return rc;
4b0fe319 2035 }
0e66b3b6 2036 }
d093f8e5 2037 else if (sx->dane_required)
0e66b3b6 2038 {
d093f8e5 2039 set_errno_nohost(sx->addrlist, ERRNO_DNSDEFER,
ee8b8090 2040 string_sprintf("DANE error: %s lookup not DNSSEC", sx->conn_args.host->name),
a55697ac 2041 FAIL, FALSE, &sx->delivery_start);
8d3dc239 2042# ifndef DISABLE_EVENT
ee8b8090 2043 (void) event_raise(sx->conn_args.tblock->event_action,
c4b57fdd 2044 US"dane:fail", US"dane-required");
8d3dc239 2045# endif
4b0fe319 2046 return FAIL;
0e66b3b6 2047 }
0e66b3b6
JH
2048 }
2049#endif /*DANE*/
2050
58c30e47
JH
2051 /* Make the TCP connection */
2052
74f1a423
JH
2053 sx->cctx.tls_ctx = NULL;
2054 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
ee8b8090 2055 sx->avoid_option = sx->peer_offered = smtp_peer_options = 0;
58c30e47 2056
81344b40 2057#ifndef DISABLE_PIPE_CONNECT
fd6e2d18
JH
2058 if ( verify_check_given_host(CUSS &ob->hosts_pipe_connect,
2059 sx->conn_args.host) == OK)
2060
2061 /* We don't find out the local ip address until the connect, so if
2062 the helo string might use it avoid doing early-pipelining. */
2063
2064 if ( !sx->helo_data
2065 || !Ustrstr(sx->helo_data, "$sending_ip_address")
2066 || Ustrstr(sx->helo_data, "def:sending_ip_address")
2067 )
58c30e47 2068 {
fd6e2d18
JH
2069 sx->early_pipe_ok = TRUE;
2070 if ( read_ehlo_cache_entry(sx)
2071 && sx->ehlo_resp.cleartext_features & OPTION_EARLY_PIPE)
2072 {
2073 DEBUG(D_transport)
2074 debug_printf("Using cached cleartext PIPE_CONNECT\n");
2075 sx->early_pipe_active = TRUE;
2076 sx->peer_offered = sx->ehlo_resp.cleartext_features;
2077 }
58c30e47 2078 }
fd6e2d18
JH
2079 else DEBUG(D_transport)
2080 debug_printf("helo needs $sending_ip_address\n");
58c30e47 2081
4ca005cd 2082PIPE_CONNECT_RETRY:
ee8b8090
JH
2083 if (sx->early_pipe_active)
2084 sx->outblock.conn_args = &sx->conn_args;
2085 else
2086#endif
2087 {
2088 if ((sx->cctx.sock = smtp_connect(&sx->conn_args, NULL)) < 0)
2089 {
ee8b8090
JH
2090 set_errno_nohost(sx->addrlist,
2091 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
b471ea6f 2092 sx->verify ? US strerror(errno) : NULL,
a55697ac 2093 DEFER, FALSE, &sx->delivery_start);
ee8b8090
JH
2094 sx->send_quit = FALSE;
2095 return DEFER;
2096 }
2097 }
41c7c167
PH
2098 /* Expand the greeting message while waiting for the initial response. (Makes
2099 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
2100 delayed till here so that $sending_interface and $sending_port are set. */
ee8b8090
JH
2101/*XXX early-pipe: they still will not be. Is there any way to find out what they
2102will be? Somehow I doubt it. */
41c7c167 2103
02b41d71
JH
2104 if (sx->helo_data)
2105 if (!(sx->helo_data = expand_string(sx->helo_data)))
e9166683 2106 if (sx->verify)
02b41d71
JH
2107 log_write(0, LOG_MAIN|LOG_PANIC,
2108 "<%s>: failed to expand transport's helo_data value for callout: %s",
2109 sx->addrlist->address, expand_string_message);
2110
8c5d388a 2111#ifdef SUPPORT_I18N
d093f8e5 2112 if (sx->helo_data)
810d16ad 2113 {
02b41d71
JH
2114 expand_string_message = NULL;
2115 if ((sx->helo_data = string_domain_utf8_to_alabel(sx->helo_data,
2116 &expand_string_message)),
2117 expand_string_message)
e9166683 2118 if (sx->verify)
02b41d71
JH
2119 log_write(0, LOG_MAIN|LOG_PANIC,
2120 "<%s>: failed to expand transport's helo_data value for callout: %s",
2121 sx->addrlist->address, expand_string_message);
2122 else
2123 sx->helo_data = NULL;
810d16ad
JH
2124 }
2125#endif
41c7c167 2126
0756eb3c
PH
2127 /* The first thing is to wait for an initial OK response. The dreaded "goto"
2128 is nevertheless a reasonably clean way of programming this kind of logic,
2129 where you want to escape on any error. */
2130
d093f8e5 2131 if (!sx->smtps)
061b7ebd 2132 {
81344b40 2133#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2134 if (sx->early_pipe_active)
2135 {
2136 sx->pending_BANNER = TRUE; /* sync_responses() must eventually handle */
2137 sx->outblock.cmd_count = 1;
2138 }
2139 else
8d330698 2140#endif
ee8b8090
JH
2141 {
2142#ifdef TCP_QUICKACK
2143 (void) setsockopt(sx->cctx.sock, IPPROTO_TCP, TCP_QUICKACK, US &off,
2144 sizeof(off));
895fbaf2 2145#endif
ee8b8090
JH
2146 if (!smtp_reap_banner(sx))
2147 goto RESPONSE_FAILED;
2148 }
0756eb3c 2149
0cbf2b82 2150#ifndef DISABLE_EVENT
b30275b8 2151 {
805c9d53 2152 uschar * s;
ee8b8090
JH
2153 lookup_dnssec_authenticated = sx->conn_args.host->dnssec==DS_YES ? US"yes"
2154 : sx->conn_args.host->dnssec==DS_NO ? US"no" : NULL;
2155 s = event_raise(sx->conn_args.tblock->event_action, US"smtp:connect", sx->buffer);
b30275b8 2156 if (s)
a7538db1 2157 {
d093f8e5 2158 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL,
b30275b8 2159 string_sprintf("deferred by smtp:connect event expansion: %s", s),
a55697ac 2160 DEFER, FALSE, &sx->delivery_start);
a7538db1
JH
2161 yield = DEFER;
2162 goto SEND_QUIT;
2163 }
b30275b8 2164 }
a7538db1
JH
2165#endif
2166
061b7ebd
PP
2167 /* Now check if the helo_data expansion went well, and sign off cleanly if
2168 it didn't. */
41c7c167 2169
d093f8e5 2170 if (!sx->helo_data)
061b7ebd 2171 {
d093f8e5 2172 message = string_sprintf("failed to expand helo_data: %s",
061b7ebd 2173 expand_string_message);
a55697ac 2174 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
061b7ebd
PP
2175 yield = DEFER;
2176 goto SEND_QUIT;
2177 }
41c7c167
PH
2178 }
2179
0756eb3c 2180/** Debugging without sending a message
d093f8e5 2181sx->addrlist->transport_return = DEFER;
0756eb3c
PH
2182goto SEND_QUIT;
2183**/
2184
2185 /* Errors that occur after this point follow an SMTP command, which is
2186 left in big_buffer by smtp_write_command() for use in error messages. */
2187
2188 smtp_command = big_buffer;
2189
2190 /* Tell the remote who we are...
2191
2192 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
2193 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
2194 greeting is of this form. The assumption was that the far end supports it
2195 properly... but experience shows that there are some that give 5xx responses,
2196 even though the banner includes "ESMTP" (there's a bloody-minded one that
2197 says "ESMTP not spoken here"). Cope with that case.
2198
2199 September 2000: Time has passed, and it seems reasonable now to always send
2200 EHLO at the start. It is also convenient to make the change while installing
2201 the TLS stuff.
2202
2203 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
2204 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
2205 would be no way to send out the mails, so there is now a host list
2206 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
2207 PIPELINING problem as well. Maybe it can also be useful to cure other
2208 problems with broken servers.
2209
2210 Exim originally sent "Helo" at this point and ran for nearly a year that way.
2211 Then somebody tried it with a Microsoft mailer... It seems that all other
2212 mailers use upper case for some reason (the RFC is quite clear about case
2213 independence) so, for peace of mind, I gave in. */
2214
ee8b8090 2215 sx->esmtp = verify_check_given_host(CUSS &ob->hosts_avoid_esmtp, sx->conn_args.host) != OK;
0756eb3c 2216
061b7ebd
PP
2217 /* Alas; be careful, since this goto is not an error-out, so conceivably
2218 we might set data between here and the target which we assume to exist
2219 and be usable. I can see this coming back to bite us. */
01603eec 2220#ifndef DISABLE_TLS
d093f8e5 2221 if (sx->smtps)
061b7ebd 2222 {
14de8063 2223 smtp_peer_options |= OPTION_TLS;
061b7ebd 2224 suppress_tls = FALSE;
ee8b8090 2225 ob->tls_tempfail_tryclear = FALSE;
061b7ebd
PP
2226 smtp_command = US"SSL-on-connect";
2227 goto TLS_NEGOTIATE;
2228 }
a7538db1 2229#endif
061b7ebd 2230
d093f8e5 2231 if (sx->esmtp)
0756eb3c 2232 {
ee8b8090 2233 if (smtp_write_command(sx,
81344b40 2234#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2235 sx->early_pipe_active ? SCMD_BUFFER :
2236#endif
2237 SCMD_FLUSH,
2238 "%s %s\r\n", sx->lmtp ? "LHLO" : "EHLO", sx->helo_data) < 0)
0756eb3c 2239 goto SEND_FAILED;
d093f8e5 2240 sx->esmtp_sent = TRUE;
ee8b8090 2241
81344b40 2242#ifndef DISABLE_PIPE_CONNECT
ee8b8090 2243 if (sx->early_pipe_active)
0756eb3c 2244 {
ee8b8090
JH
2245 sx->pending_EHLO = TRUE;
2246
2247 /* If we have too many authenticators to handle and might need to AUTH
2248 for this transport, pipeline no further as we will need the
2249 list of auth methods offered. Reap the banner and EHLO. */
2250
2251 if ( (ob->hosts_require_auth || ob->hosts_try_auth)
2252 && f.smtp_in_early_pipe_no_auth)
895fbaf2 2253 {
ee8b8090
JH
2254 DEBUG(D_transport) debug_printf("may need to auth, so pipeline no further\n");
2255 if (smtp_write_command(sx, SCMD_FLUSH, NULL) < 0)
2256 goto SEND_FAILED;
2257 if (sync_responses(sx, 2, 0) != 0)
2258 {
2259 HDEBUG(D_transport)
2260 debug_printf("failed reaping pipelined cmd responses\n");
2261 goto RESPONSE_FAILED;
2262 }
2263 sx->early_pipe_active = FALSE;
895fbaf2 2264 }
0756eb3c 2265 }
ee8b8090 2266 else
895fbaf2 2267#endif
ee8b8090
JH
2268 if (!smtp_reap_ehlo(sx))
2269 goto RESPONSE_FAILED;
0756eb3c
PH
2270 }
2271 else
0756eb3c
PH
2272 DEBUG(D_transport)
2273 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
0756eb3c 2274
81344b40 2275#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2276 if (!sx->early_pipe_active)
2277#endif
2278 if (!sx->esmtp)
2279 {
2280 BOOL good_response;
2281 int n = sizeof(sx->buffer);
2282 uschar * rsp = sx->buffer;
a57ce043 2283
ee8b8090
JH
2284 if (sx->esmtp_sent && (n = Ustrlen(sx->buffer)) < sizeof(sx->buffer)/2)
2285 { rsp = sx->buffer + n + 1; n = sizeof(sx->buffer) - n; }
895fbaf2 2286
ee8b8090
JH
2287 if (smtp_write_command(sx, SCMD_FLUSH, "HELO %s\r\n", sx->helo_data) < 0)
2288 goto SEND_FAILED;
2289 good_response = smtp_read_response(sx, rsp, n, '2', ob->command_timeout);
895fbaf2 2290#ifdef EXPERIMENTAL_DSN_INFO
ee8b8090 2291 sx->helo_response = string_copy(rsp);
895fbaf2 2292#endif
ee8b8090 2293 if (!good_response)
a57ce043 2294 {
ee8b8090
JH
2295 /* Handle special logging for a closed connection after HELO
2296 when had previously sent EHLO */
2297
2298 if (rsp != sx->buffer && rsp[0] == 0 && (errno == 0 || errno == ECONNRESET))
2299 {
2300 errno = ERRNO_SMTPCLOSED;
2301 goto EHLOHELO_FAILED;
2302 }
2303 memmove(sx->buffer, rsp, Ustrlen(rsp));
2304 goto RESPONSE_FAILED;
a57ce043 2305 }
a57ce043 2306 }
2d14f397 2307
d093f8e5 2308 if (sx->esmtp || sx->lmtp)
2d14f397 2309 {
81344b40 2310#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2311 if (!sx->early_pipe_active)
2312#endif
2313 {
2314 sx->peer_offered = ehlo_response(sx->buffer,
2315 OPTION_TLS /* others checked later */
81344b40 2316#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2317 | (sx->early_pipe_ok
2318 ? OPTION_IGNQ
2319 | OPTION_CHUNKING | OPTION_PRDR | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
2320#ifdef SUPPORT_I18N
2321 | OPTION_UTF8
2322#endif
2323 | OPTION_EARLY_PIPE
2324 : 0
2325 )
2326#endif
2327 );
81344b40 2328#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2329 if (sx->early_pipe_ok)
2330 {
2331 sx->ehlo_resp.cleartext_features = sx->peer_offered;
2332
2333 if ( (sx->peer_offered & (OPTION_PIPE | OPTION_EARLY_PIPE))
2334 == (OPTION_PIPE | OPTION_EARLY_PIPE))
2335 {
2336 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2337 sx->ehlo_resp.cleartext_auths = study_ehlo_auths(sx);
2338 write_ehlo_cache_entry(sx);
2339 }
2340 }
2341#endif
2342 }
f1513293 2343
0756eb3c
PH
2344 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
2345
01603eec 2346#ifndef DISABLE_TLS
14de8063 2347 smtp_peer_options |= sx->peer_offered & OPTION_TLS;
7ade712c 2348#endif
2d14f397 2349 }
0756eb3c
PH
2350 }
2351
57cc2785
JH
2352/* For continuing deliveries down the same channel, having re-exec'd the socket
2353is the standard input; for a socket held open from verify it is recorded
2354in the cutthrough context block. Either way we don't need to redo EHLO here
2355(but may need to do so for TLS - see below).
2356Set up the pointer to where subsequent commands will be left, for
2d14f397 2357error messages. Note that smtp_peer_options will have been
0756eb3c
PH
2358set from the command line if they were set in the process that passed the
2359connection on. */
2360
895fbaf2 2361/*XXX continue case needs to propagate DSN_INFO, prob. in deliver.c
4c04137d 2362as the continue goes via transport_pass_socket() and doublefork and exec.
895fbaf2
JH
2363It does not wait. Unclear how we keep separate host's responses
2364separate - we could match up by host ip+port as a bodge. */
2365
0756eb3c
PH
2366else
2367 {
74f1a423 2368 if (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only)
57cc2785 2369 {
74f1a423 2370 sx->cctx = cutthrough.cctx;
ee8b8090 2371 sx->conn_args.host->port = sx->port = cutthrough.host.port;
57cc2785
JH
2372 }
2373 else
2374 {
74f1a423
JH
2375 sx->cctx.sock = 0; /* stdin */
2376 sx->cctx.tls_ctx = NULL;
ee8b8090 2377 smtp_port_for_connect(sx->conn_args.host, sx->port); /* Record the port that was used */
57cc2785 2378 }
74f1a423 2379 sx->inblock.cctx = sx->outblock.cctx = &sx->cctx;
0756eb3c 2380 smtp_command = big_buffer;
5bf8a516 2381 sx->peer_offered = smtp_peer_options;
02b41d71 2382 sx->helo_data = NULL; /* ensure we re-expand ob->helo_data */
875512a3 2383
57cc2785
JH
2384 /* For a continued connection with TLS being proxied for us, or a
2385 held-open verify connection with TLS, nothing more to do. */
875512a3 2386
57cc2785 2387 if ( continue_proxy_cipher
74f1a423
JH
2388 || (cutthrough.cctx.sock >= 0 && cutthrough.callout_hold_only
2389 && cutthrough.is_tls)
57cc2785 2390 )
875512a3 2391 {
7c576fca 2392 sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
57cc2785
JH
2393 HDEBUG(D_transport) debug_printf("continued connection, %s TLS\n",
2394 continue_proxy_cipher ? "proxied" : "verify conn with");
875512a3
JH
2395 return OK;
2396 }
2397 HDEBUG(D_transport) debug_printf("continued connection, no TLS\n");
0756eb3c
PH
2398 }
2399
2400/* If TLS is available on this connection, whether continued or not, attempt to
2401start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
2402send another EHLO - the server may give a different answer in secure mode. We
2403use a separate buffer for reading the response to STARTTLS so that if it is
2404negative, the original EHLO data is available for subsequent analysis, should
2405the client not be required to use TLS. If the response is bad, copy the buffer
2406for error analysis. */
2407
01603eec 2408#ifndef DISABLE_TLS
14de8063 2409if ( smtp_peer_options & OPTION_TLS
5130845b 2410 && !suppress_tls
ee8b8090 2411 && verify_check_given_host(CUSS &ob->hosts_avoid_tls, sx->conn_args.host) != OK
e9166683 2412 && ( !sx->verify
ee8b8090 2413 || verify_check_given_host(CUSS &ob->hosts_verify_avoid_tls, sx->conn_args.host) != OK
02b41d71 2414 ) )
0756eb3c
PH
2415 {
2416 uschar buffer2[4096];
ee8b8090 2417
251b9eb4 2418 if (smtp_write_command(sx, SCMD_FLUSH, "STARTTLS\r\n") < 0)
0756eb3c
PH
2419 goto SEND_FAILED;
2420
81344b40 2421#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2422 /* If doing early-pipelining reap the banner and EHLO-response but leave
2423 the response for the STARTTLS we just sent alone. */
2424
2425 if (sx->early_pipe_active && sync_responses(sx, 2, 0) != 0)
2426 {
2427 HDEBUG(D_transport)
2428 debug_printf("failed reaping pipelined cmd responses\n");
4ca005cd
JH
2429 close(sx->cctx.sock);
2430 sx->cctx.sock = -1;
2431 sx->early_pipe_active = FALSE;
2432 goto PIPE_CONNECT_RETRY;
ee8b8090
JH
2433 }
2434#endif
2435
0756eb3c
PH
2436 /* If there is an I/O error, transmission of this message is deferred. If
2437 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
2438 false, we also defer. However, if there is a temporary rejection of STARTTLS
2439 and tls_tempfail_tryclear is true, or if there is an outright rejection of
2440 STARTTLS, we carry on. This means we will try to send the message in clear,
2441 unless the host is in hosts_require_tls (tested below). */
2442
ee8b8090 2443 if (!smtp_read_response(sx, buffer2, sizeof(buffer2), '2', ob->command_timeout))
0756eb3c 2444 {
4b0fe319
JH
2445 if ( errno != 0
2446 || buffer2[0] == 0
ee8b8090 2447 || (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)
4b0fe319 2448 )
0dda4340 2449 {
d093f8e5 2450 Ustrncpy(sx->buffer, buffer2, sizeof(sx->buffer));
9e7e0f6a 2451 sx->buffer[sizeof(sx->buffer)-1] = '\0';
0756eb3c 2452 goto RESPONSE_FAILED;
0dda4340 2453 }
0756eb3c
PH
2454 }
2455
2456 /* STARTTLS accepted: try to negotiate a TLS session. */
2457
2458 else
061b7ebd 2459 TLS_NEGOTIATE:
0756eb3c 2460 {
c05bdbd6 2461 if (!tls_client_start(&sx->cctx, &sx->conn_args, sx->addrlist, &tls_out, &tls_errstr))
0756eb3c 2462 {
74f1a423
JH
2463 /* TLS negotiation failed; give an error. From outside, this function may
2464 be called again to try in clear on a new connection, if the options permit
2465 it for this host. */
dca6d121
JH
2466#ifdef USE_GNUTLS
2467 GNUTLS_CONN_FAILED:
2468#endif
fc243e94 2469 DEBUG(D_tls) debug_printf("TLS session fail: %s\n", tls_errstr);
74f1a423 2470
c0635b6d 2471# ifdef SUPPORT_DANE
c05bdbd6 2472 if (sx->conn_args.dane)
c4b57fdd
JH
2473 {
2474 log_write(0, LOG_MAIN,
cf0c6164 2475 "DANE attempt failed; TLS connection to %s [%s]: %s",
fc243e94 2476 sx->conn_args.host->name, sx->conn_args.host->address, tls_errstr);
8d3dc239 2477# ifndef DISABLE_EVENT
ee8b8090 2478 (void) event_raise(sx->conn_args.tblock->event_action,
c4b57fdd 2479 US"dane:fail", US"validation-failure"); /* could do with better detail */
8d3dc239 2480# endif
c4b57fdd 2481 }
6ebd79ec
JH
2482# endif
2483
de6273b4 2484 errno = ERRNO_TLSFAILURE;
fc243e94 2485 message = string_sprintf("TLS session: %s", tls_errstr);
d093f8e5 2486 sx->send_quit = FALSE;
0756eb3c
PH
2487 goto TLS_FAILED;
2488 }
2489
2490 /* TLS session is set up */
2491
2d14f397 2492 smtp_peer_options_wrap = smtp_peer_options;
d7978c0f 2493 for (address_item * addr = sx->addrlist; addr; addr = addr->next)
5ca2a9a1
PH
2494 if (addr->transport_return == PENDING_DEFER)
2495 {
817d9f57 2496 addr->cipher = tls_out.cipher;
9d1c15ef
JH
2497 addr->ourcert = tls_out.ourcert;
2498 addr->peercert = tls_out.peercert;
817d9f57 2499 addr->peerdn = tls_out.peerdn;
018058b2 2500 addr->ocsp = tls_out.ocsp;
da40b1ec 2501 addr->tlsver = tls_out.ver;
5ca2a9a1 2502 }
0756eb3c
PH
2503 }
2504 }
2505
061b7ebd
PP
2506/* if smtps, we'll have smtp_command set to something else; always safe to
2507reset it here. */
2508smtp_command = big_buffer;
2509
41c7c167
PH
2510/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
2511helo_data is null, we are dealing with a connection that was passed from
2512another process, and so we won't have expanded helo_data above. We have to
2513expand it here. $sending_ip_address and $sending_port are set up right at the
2514start of the Exim process (in exim.c). */
0756eb3c 2515
74f1a423 2516if (tls_out.active.sock >= 0)
0756eb3c 2517 {
ee8b8090 2518 uschar * greeting_cmd;
895fbaf2 2519
ee8b8090 2520 if (!sx->helo_data && !(sx->helo_data = expand_string(ob->helo_data)))
41c7c167 2521 {
d093f8e5
JH
2522 uschar *message = string_sprintf("failed to expand helo_data: %s",
2523 expand_string_message);
a55697ac 2524 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
d093f8e5
JH
2525 yield = DEFER;
2526 goto SEND_QUIT;
41c7c167
PH
2527 }
2528
81344b40 2529#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2530 /* For SMTPS there is no cleartext early-pipe; use the crypted permission bit.
2531 We're unlikely to get the group sent and delivered before the server sends its
2532 banner, but it's still worth sending as a group.
2533 For STARTTLS allow for cleartext early-pipe but no crypted early-pipe, but not
2534 the reverse. */
2535
2536 if (sx->smtps ? sx->early_pipe_ok : sx->early_pipe_active)
2537 {
2538 sx->peer_offered = sx->ehlo_resp.crypted_features;
2539 if ((sx->early_pipe_active =
2540 !!(sx->ehlo_resp.crypted_features & OPTION_EARLY_PIPE)))
2541 DEBUG(D_transport) debug_printf("Using cached crypted PIPE_CONNECT\n");
2542 }
2543#endif
2544
0d0e4455 2545 /* For SMTPS we need to wait for the initial OK response. */
d093f8e5 2546 if (sx->smtps)
81344b40 2547#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2548 if (sx->early_pipe_active)
2549 {
2550 sx->pending_BANNER = TRUE;
2551 sx->outblock.cmd_count = 1;
2552 }
2553 else
895fbaf2 2554#endif
ee8b8090
JH
2555 if (!smtp_reap_banner(sx))
2556 goto RESPONSE_FAILED;
0d0e4455 2557
ee8b8090
JH
2558 if (sx->lmtp)
2559 greeting_cmd = US"LHLO";
2560 else if (sx->esmtp)
2561 greeting_cmd = US"EHLO";
0d0e4455
PP
2562 else
2563 {
ee8b8090 2564 greeting_cmd = US"HELO";
0d0e4455
PP
2565 DEBUG(D_transport)
2566 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
2567 }
2568
ee8b8090 2569 if (smtp_write_command(sx,
81344b40 2570#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2571 sx->early_pipe_active ? SCMD_BUFFER :
2572#endif
2573 SCMD_FLUSH,
2574 "%s %s\r\n", greeting_cmd, sx->helo_data) < 0)
0756eb3c 2575 goto SEND_FAILED;
ee8b8090 2576
81344b40 2577#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2578 if (sx->early_pipe_active)
2579 sx->pending_EHLO = TRUE;
2580 else
895fbaf2 2581#endif
ee8b8090
JH
2582 {
2583 if (!smtp_reap_ehlo(sx))
fc243e94
JH
2584#ifdef USE_GNUTLS
2585 {
2586 /* The GnuTLS layer in Exim only spots a server-rejection of a client
2587 cert late, under TLS1.3 - which means here; the first time we try to
2588 receive crypted data. Treat it as if it was a connect-time failure.
2589 See also the early-pipe equivalent... which will be hard; every call
2590 to sync_responses will need to check the result.
2591 It would be nicer to have GnuTLS check the cert during the handshake.
2592 Can it do that, with all the flexibility we need? */
2593
2594 tls_errstr = US"error on first read";
2595 goto GNUTLS_CONN_FAILED;
2596 }
2597#else
ee8b8090 2598 goto RESPONSE_FAILED;
fc243e94 2599#endif
ee8b8090
JH
2600 smtp_peer_options = 0;
2601 }
0756eb3c
PH
2602 }
2603
2604/* If the host is required to use a secure channel, ensure that we
2605have one. */
2606
d093f8e5 2607else if ( sx->smtps
c0635b6d 2608# ifdef SUPPORT_DANE
c05bdbd6 2609 || sx->conn_args.dane
0e66b3b6 2610# endif
ee8b8090 2611 || verify_check_given_host(CUSS &ob->hosts_require_tls, sx->conn_args.host) == OK
7a31d643 2612 )
0756eb3c 2613 {
9883af72 2614 errno = ERRNO_TLSREQUIRED;
c562fd30 2615 message = string_sprintf("a TLS session is required, but %s",
14de8063 2616 smtp_peer_options & OPTION_TLS
2d14f397 2617 ? "an attempt to start TLS failed" : "the server did not offer TLS support");
8d3dc239 2618# if defined(SUPPORT_DANE) && !defined(DISABLE_EVENT)
c05bdbd6 2619 if (sx->conn_args.dane)
ee8b8090 2620 (void) event_raise(sx->conn_args.tblock->event_action, US"dane:fail",
c4b57fdd
JH
2621 smtp_peer_options & OPTION_TLS
2622 ? US"validation-failure" /* could do with better detail */
2623 : US"starttls-not-supported");
2624# endif
0756eb3c
PH
2625 goto TLS_FAILED;
2626 }
01603eec 2627#endif /*DISABLE_TLS*/
0756eb3c
PH
2628
2629/* If TLS is active, we have just started it up and re-done the EHLO command,
2630so its response needs to be analyzed. If TLS is not active and this is a
2631continued session down a previously-used socket, we haven't just done EHLO, so
2632we skip this. */
2633
2634if (continue_hostname == NULL
01603eec 2635#ifndef DISABLE_TLS
74f1a423 2636 || tls_out.active.sock >= 0
a7538db1 2637#endif
0756eb3c
PH
2638 )
2639 {
d093f8e5 2640 if (sx->esmtp || sx->lmtp)
2d14f397 2641 {
81344b40 2642#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2643 if (!sx->early_pipe_active)
2644#endif
2645 {
e9166683 2646 sx->peer_offered = ehlo_response(sx->buffer,
d093f8e5 2647 0 /* no TLS */
81344b40 2648#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2649 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
2650 | OPTION_DSN | OPTION_PIPE | OPTION_SIZE
9883af72 2651 | OPTION_CHUNKING | OPTION_PRDR | OPTION_UTF8
ee8b8090
JH
2652 | (tls_out.active.sock >= 0 ? OPTION_EARLY_PIPE : 0) /* not for lmtp */
2653
2654#else
2655
2656 | (sx->lmtp && ob->lmtp_ignore_quota ? OPTION_IGNQ : 0)
14de8063
JH
2657 | OPTION_CHUNKING
2658 | OPTION_PRDR
ee8b8090 2659# ifdef SUPPORT_I18N
14de8063 2660 | (sx->addrlist->prop.utf8_msg ? OPTION_UTF8 : 0)
d093f8e5
JH
2661 /*XXX if we hand peercaps on to continued-conn processes,
2662 must not depend on this addr */
ee8b8090 2663# endif
14de8063
JH
2664 | OPTION_DSN
2665 | OPTION_PIPE
ee8b8090 2666 | (ob->size_addition >= 0 ? OPTION_SIZE : 0)
8ac90765 2667#endif
9094b84b 2668 );
81344b40 2669#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2670 if (tls_out.active.sock >= 0)
2671 sx->ehlo_resp.crypted_features = sx->peer_offered;
2672#endif
2673 }
9094b84b 2674
2d14f397
JH
2675 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
2676 lmtp_ignore_quota option was set. */
f1513293 2677
14de8063 2678 sx->igquotstr = sx->peer_offered & OPTION_IGNQ ? US" IGNOREQUOTA" : US"";
f1513293 2679
2d14f397
JH
2680 /* If the response to EHLO specified support for the SIZE parameter, note
2681 this, provided size_addition is non-negative. */
f1513293 2682
14de8063 2683 smtp_peer_options |= sx->peer_offered & OPTION_SIZE;
0756eb3c 2684
2d14f397
JH
2685 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
2686 the current host, esmtp will be false, so PIPELINING can never be used. If
2687 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c 2688
14de8063 2689 if ( sx->peer_offered & OPTION_PIPE
ee8b8090 2690 && verify_check_given_host(CUSS &ob->hosts_avoid_pipelining, sx->conn_args.host) != OK)
14de8063 2691 smtp_peer_options |= OPTION_PIPE;
0756eb3c 2692
2d14f397 2693 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
14de8063 2694 smtp_peer_options & OPTION_PIPE ? "" : "not ");
0756eb3c 2695
14de8063 2696 if ( sx->peer_offered & OPTION_CHUNKING
ee8b8090 2697 && verify_check_given_host(CUSS &ob->hosts_try_chunking, sx->conn_args.host) != OK)
14de8063 2698 sx->peer_offered &= ~OPTION_CHUNKING;
f98442df 2699
14de8063 2700 if (sx->peer_offered & OPTION_CHUNKING)
ee8b8090 2701 DEBUG(D_transport) debug_printf("CHUNKING usable\n");
0756eb3c 2702
8ccd00b1 2703#ifndef DISABLE_PRDR
14de8063 2704 if ( sx->peer_offered & OPTION_PRDR
ee8b8090 2705 && verify_check_given_host(CUSS &ob->hosts_try_prdr, sx->conn_args.host) != OK)
14de8063 2706 sx->peer_offered &= ~OPTION_PRDR;
fd98a5c6 2707
14de8063 2708 if (sx->peer_offered & OPTION_PRDR)
ee8b8090 2709 DEBUG(D_transport) debug_printf("PRDR usable\n");
fd98a5c6
JH
2710#endif
2711
2d14f397 2712 /* Note if the server supports DSN */
14de8063 2713 smtp_peer_options |= sx->peer_offered & OPTION_DSN;
2d14f397 2714 DEBUG(D_transport) debug_printf("%susing DSN\n",
14de8063 2715 sx->peer_offered & OPTION_DSN ? "" : "not ");
6c1c3d1d 2716
81344b40 2717#ifndef DISABLE_PIPE_CONNECT
ee8b8090
JH
2718 if ( sx->early_pipe_ok
2719 && !sx->early_pipe_active
2720 && tls_out.active.sock >= 0
2721 && smtp_peer_options & OPTION_PIPE
2722 && ( sx->ehlo_resp.cleartext_features | sx->ehlo_resp.crypted_features)
2723 & OPTION_EARLY_PIPE)
2724 {
2725 DEBUG(D_transport) debug_printf("PIPE_CONNECT usable in future for this IP\n");
2726 sx->ehlo_resp.crypted_auths = study_ehlo_auths(sx);
2727 write_ehlo_cache_entry(sx);
2728 }
2729#endif
2730
2d14f397
JH
2731 /* Note if the response to EHLO specifies support for the AUTH extension.
2732 If it has, check that this host is one we want to authenticate to, and do
2733 the business. The host name and address must be available when the
2734 authenticator's client driver is running. */
0756eb3c 2735
ee8b8090 2736 switch (yield = smtp_auth(sx))
2d14f397
JH
2737 {
2738 default: goto SEND_QUIT;
2739 case OK: break;
2740 case FAIL_SEND: goto SEND_FAILED;
2741 case FAIL: goto RESPONSE_FAILED;
2742 }
0756eb3c
PH
2743 }
2744 }
7c576fca 2745sx->pipelining_used = pipelining_active = !!(smtp_peer_options & OPTION_PIPE);
0756eb3c
PH
2746
2747/* The setting up of the SMTP call is now complete. Any subsequent errors are
2748message-specific. */
2749
d093f8e5 2750sx->setting_up = FALSE;
0756eb3c 2751
8c5d388a 2752#ifdef SUPPORT_I18N
d093f8e5 2753if (sx->addrlist->prop.utf8_msg)
9094b84b 2754 {
71c15846
JH
2755 uschar * s;
2756
2757 /* If the transport sets a downconversion mode it overrides any set by ACL
2758 for the message. */
2759
ee8b8090 2760 if ((s = ob->utf8_downconvert))
71c15846
JH
2761 {
2762 if (!(s = expand_string(s)))
2763 {
2764 message = string_sprintf("failed to expand utf8_downconvert: %s",
2765 expand_string_message);
a55697ac 2766 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, &sx->delivery_start);
71c15846
JH
2767 yield = DEFER;
2768 goto SEND_QUIT;
2769 }
2770 switch (*s)
2771 {
2772 case '1': sx->addrlist->prop.utf8_downcvt = TRUE;
2773 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2774 break;
2775 case '0': sx->addrlist->prop.utf8_downcvt = FALSE;
2776 sx->addrlist->prop.utf8_downcvt_maybe = FALSE;
2777 break;
2778 case '-': if (s[1] == '1')
2779 {
2780 sx->addrlist->prop.utf8_downcvt = FALSE;
2781 sx->addrlist->prop.utf8_downcvt_maybe = TRUE;
2782 }
2783 break;
2784 }
2785 }
2786
d093f8e5
JH
2787 sx->utf8_needed = !sx->addrlist->prop.utf8_downcvt
2788 && !sx->addrlist->prop.utf8_downcvt_maybe;
2789 DEBUG(D_transport) if (!sx->utf8_needed)
59a286ef 2790 debug_printf("utf8: %s downconvert\n",
d093f8e5 2791 sx->addrlist->prop.utf8_downcvt ? "mandatory" : "optional");
9094b84b
JH
2792 }
2793
7ade712c 2794/* If this is an international message we need the host to speak SMTPUTF8 */
14de8063 2795if (sx->utf8_needed && !(sx->peer_offered & OPTION_UTF8))
7ade712c
JH
2796 {
2797 errno = ERRNO_UTF8_FWD;
2798 goto RESPONSE_FAILED;
2799 }
71c15846 2800#endif /*SUPPORT_I18N*/
7ade712c 2801
d093f8e5
JH
2802return OK;
2803
2804
2805 {
2806 int code;
d093f8e5
JH
2807
2808 RESPONSE_FAILED:
eebcfa1c
JH
2809 if (errno == ECONNREFUSED) /* first-read error on a TFO conn */
2810 {
2811 /* There is a testing facility for simulating a connection timeout, as I
2812 can't think of any other way of doing this. It converts a connection
2813 refused into a timeout if the timeout is set to 999999. This is done for
2814 a 3whs connection in ip_connect(), but a TFO connection does not error
2815 there - instead it gets ECONNREFUSED on the first data read. Tracking
2816 that a TFO really was done is too hard, or we would set a
2817 sx->pending_conn_done bit and test that in smtp_reap_banner() and
2818 smtp_reap_ehlo(). That would let us also add the conn-timeout to the
2819 cmd-timeout. */
2820
2821 if (f.running_in_test_harness && ob->connect_timeout == 999999)
2822 errno = ETIMEDOUT;
2823 set_errno_nohost(sx->addrlist,
2824 errno == ETIMEDOUT ? ERRNO_CONNECTTIMEOUT : errno,
2825 sx->verify ? US strerror(errno) : NULL,
a55697ac 2826 DEFER, FALSE, &sx->delivery_start);
eebcfa1c
JH
2827 sx->send_quit = FALSE;
2828 return DEFER;
2829 }
2830
2831 /* really an error on an SMTP read */
d093f8e5 2832 message = NULL;
ee8b8090 2833 sx->send_quit = check_response(sx->conn_args.host, &errno, sx->addrlist->more_errno,
d093f8e5 2834 sx->buffer, &code, &message, &pass_message);
8ac90765 2835 yield = DEFER;
d093f8e5 2836 goto FAILED;
d093f8e5
JH
2837
2838 SEND_FAILED:
d093f8e5
JH
2839 code = '4';
2840 message = US string_sprintf("send() to %s [%s] failed: %s",
ee8b8090 2841 sx->conn_args.host->name, sx->conn_args.host->address, strerror(errno));
d093f8e5 2842 sx->send_quit = FALSE;
8ac90765 2843 yield = DEFER;
d093f8e5 2844 goto FAILED;
d093f8e5 2845
de6273b4
JH
2846 EHLOHELO_FAILED:
2847 code = '4';
2848 message = string_sprintf("Remote host closed connection in response to %s"
2849 " (EHLO response was: %s)", smtp_command, sx->buffer);
2850 sx->send_quit = FALSE;
8ac90765 2851 yield = DEFER;
de6273b4
JH
2852 goto FAILED;
2853
e5ab0ba9
JH
2854 /* This label is jumped to directly when a TLS negotiation has failed,
2855 or was not done for a host for which it is required. Values will be set
2856 in message and errno, and setting_up will always be true. Treat as
2857 a temporary error. */
2858
01603eec 2859#ifndef DISABLE_TLS
d093f8e5 2860 TLS_FAILED:
9883af72 2861 code = '4', yield = DEFER;
de6273b4 2862 goto FAILED;
d093f8e5
JH
2863#endif
2864
2865 /* The failure happened while setting up the call; see if the failure was
2866 a 5xx response (this will either be on connection, or following HELO - a 5xx
e69636bc
JH
2867 after EHLO causes it to try HELO). If so, and there are no more hosts to try,
2868 fail all addresses, as this host is never going to accept them. For other
2869 errors during setting up (timeouts or whatever), defer all addresses, and
2870 yield DEFER, so that the host is not tried again for a while.
2871
2872 XXX This peeking for another host feels like a layering violation. We want
2873 to note the host as unusable, but down here we shouldn't know if this was
2874 the last host to try for the addr(list). Perhaps the upper layer should be
2875 the one to do set_errno() ? The problem is that currently the addr is where
2876 errno etc. are stashed, but until we run out of hosts to try the errors are
2877 host-specific. Maybe we should enhance the host_item definition? */
d093f8e5 2878
de6273b4 2879FAILED:
d093f8e5 2880 sx->ok = FALSE; /* For when reached by GOTO */
e69636bc 2881 set_errno(sx->addrlist, errno, message,
ee8b8090 2882 sx->conn_args.host->next
e69636bc
JH
2883 ? DEFER
2884 : code == '5'
d093f8e5 2885#ifdef SUPPORT_I18N
e69636bc 2886 || errno == ERRNO_UTF8_FWD
d093f8e5 2887#endif
e69636bc 2888 ? FAIL : DEFER,
2d56d634 2889 pass_message,
a55697ac 2890 errno == ECONNREFUSED ? NULL : sx->conn_args.host,
d093f8e5 2891#ifdef EXPERIMENTAL_DSN_INFO
a55697ac 2892 sx->smtp_greeting, sx->helo_response,
d093f8e5 2893#endif
a55697ac 2894 &sx->delivery_start);
d093f8e5
JH
2895 }
2896
2897
2898SEND_QUIT:
2899
2900if (sx->send_quit)
251b9eb4 2901 (void)smtp_write_command(sx, SCMD_FLUSH, "QUIT\r\n");
d093f8e5 2902
01603eec 2903#ifndef DISABLE_TLS
74f1a423
JH
2904if (sx->cctx.tls_ctx)
2905 {
2906 tls_close(sx->cctx.tls_ctx, TLS_SHUTDOWN_NOWAIT);
2907 sx->cctx.tls_ctx = NULL;
2908 }
d093f8e5
JH
2909#endif
2910
2911/* Close the socket, and return the appropriate value, first setting
2912works because the NULL setting is passed back to the calling process, and
2913remote_max_parallel is forced to 1 when delivering over an existing connection,
b7d3afcf 2914*/
d093f8e5 2915
e1d04f48 2916HDEBUG(D_transport|D_acl|D_v) debug_printf_indent(" SMTP(close)>>\n");
d093f8e5
JH
2917if (sx->send_quit)
2918 {
74f1a423
JH
2919 shutdown(sx->cctx.sock, SHUT_WR);
2920 if (fcntl(sx->cctx.sock, F_SETFL, O_NONBLOCK) == 0)
d7978c0f
JH
2921 for (int i = 16; read(sx->cctx.sock, sx->inbuffer, sizeof(sx->inbuffer)) > 0 && i > 0;)
2922 i--; /* drain socket */
02b41d71 2923 sx->send_quit = FALSE;
d093f8e5 2924 }
74f1a423
JH
2925(void)close(sx->cctx.sock);
2926sx->cctx.sock = -1;
d093f8e5
JH
2927
2928#ifndef DISABLE_EVENT
ee8b8090 2929(void) event_raise(sx->conn_args.tblock->event_action, US"tcp:close", NULL);
d093f8e5
JH
2930#endif
2931
2932continue_transport = NULL;
2933continue_hostname = NULL;
2934return yield;
2935}
2936
2937
9be4572b
JH
2938
2939
2940/* Create the string of options that will be appended to the MAIL FROM:
2941in the connection context buffer */
2942
2943static int
2944build_mailcmd_options(smtp_context * sx, address_item * addrlist)
2945{
2946uschar * p = sx->buffer;
2947address_item * addr;
2948int address_count;
2949
2950*p = 0;
2951
14de8063 2952/* If we know the receiving MTA supports the SIZE qualification, and we know it,
9be4572b
JH
2953send it, adding something to the message size to allow for imprecision
2954and things that get added en route. Exim keeps the number of lines
2955in a message, so we can give an accurate value for the original message, but we
2956need some additional to handle added headers. (Double "." characters don't get
2957included in the count.) */
2958
14de8063
JH
2959if ( message_size > 0
2960 && sx->peer_offered & OPTION_SIZE && !(sx->avoid_option & OPTION_SIZE))
9be4572b 2961 {
328c5688
JH
2962/*XXX problem here under spool_files_wireformat?
2963Or just forget about lines? Or inflate by a fixed proportion? */
2964
ee8b8090 2965 sprintf(CS p, " SIZE=%d", message_size+message_linecount+(SOB sx->conn_args.ob)->size_addition);
9be4572b
JH
2966 while (*p) p++;
2967 }
2968
2969#ifndef DISABLE_PRDR
aded2255 2970/* If it supports Per-Recipient Data Responses, and we have more than one recipient,
9be4572b
JH
2971request that */
2972
2973sx->prdr_active = FALSE;
14de8063 2974if (sx->peer_offered & OPTION_PRDR)
d7978c0f 2975 for (address_item * addr = addrlist; addr; addr = addr->next)
9be4572b
JH
2976 if (addr->transport_return == PENDING_DEFER)
2977 {
2978 for (addr = addr->next; addr; addr = addr->next)
2979 if (addr->transport_return == PENDING_DEFER)
2980 { /* at least two recipients to send */
2981 sx->prdr_active = TRUE;
2982 sprintf(CS p, " PRDR"); p += 5;
2983 break;
2984 }
2985 break;
2986 }
2987#endif
2988
2989#ifdef SUPPORT_I18N
2990/* If it supports internationalised messages, and this meesage need that,
2991request it */
2992
14de8063 2993if ( sx->peer_offered & OPTION_UTF8
9be4572b
JH
2994 && addrlist->prop.utf8_msg
2995 && !addrlist->prop.utf8_downcvt
2996 )
f3ebb786 2997 Ustrcpy(p, US" SMTPUTF8"), p += 9;
9be4572b
JH
2998#endif
2999
3000/* check if all addresses have DSN-lasthop flag; do not send RET and ENVID if so */
3001for (sx->dsn_all_lasthop = TRUE, addr = addrlist, address_count = 0;
3002 addr && address_count < sx->max_rcpt;
3003 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3004 {
3005 address_count++;
3006 if (!(addr->dsn_flags & rf_dsnlasthop))
3007 {
3008 sx->dsn_all_lasthop = FALSE;
3009 break;
3010 }
3011 }
3012
3013/* Add any DSN flags to the mail command */
3014
14de8063 3015if (sx->peer_offered & OPTION_DSN && !sx->dsn_all_lasthop)
9be4572b
JH
3016 {
3017 if (dsn_ret == dsn_ret_hdrs)
f3ebb786 3018 { Ustrcpy(p, US" RET=HDRS"); p += 9; }
9be4572b 3019 else if (dsn_ret == dsn_ret_full)
f3ebb786 3020 { Ustrcpy(p, US" RET=FULL"); p += 9; }
9be4572b
JH
3021
3022 if (dsn_envid)
3023 {
3024 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ENVID=%s", dsn_envid);
3025 while (*p) p++;
3026 }
3027 }
3028
3029/* If an authenticated_sender override has been specified for this transport
3030instance, expand it. If the expansion is forced to fail, and there was already
3031an authenticated_sender for this message, the original value will be used.
3032Other expansion failures are serious. An empty result is ignored, but there is
3033otherwise no check - this feature is expected to be used with LMTP and other
3034cases where non-standard addresses (e.g. without domains) might be required. */
3035
a55697ac 3036return smtp_mail_auth_str(sx, p, addrlist) ? ERROR : OK;
9be4572b
JH
3037}
3038
3039
3040static void
3041build_rcptcmd_options(smtp_context * sx, const address_item * addr)
3042{
3043uschar * p = sx->buffer;
3044*p = 0;
3045
3046/* Add any DSN flags to the rcpt command */
3047
14de8063 3048if (sx->peer_offered & OPTION_DSN && !(addr->dsn_flags & rf_dsnlasthop))
9be4572b
JH
3049 {
3050 if (addr->dsn_flags & rf_dsnflags)
3051 {
9be4572b
JH
3052 BOOL first = TRUE;
3053
f3ebb786 3054 Ustrcpy(p, US" NOTIFY=");
9be4572b 3055 while (*p) p++;
d7978c0f 3056 for (int i = 0; i < nelem(rf_list); i++) if (addr->dsn_flags & rf_list[i])
9be4572b
JH
3057 {
3058 if (!first) *p++ = ',';
3059 first = FALSE;
3060 Ustrcpy(p, rf_names[i]);
3061 while (*p) p++;
3062 }
3063 }
3064
3065 if (addr->dsn_orcpt)
3066 {
3067 string_format(p, sizeof(sx->buffer) - (p-sx->buffer), " ORCPT=%s",
3068 addr->dsn_orcpt);
3069 while (*p) p++;
3070 }
3071 }
3072}
3073
3074
d9c3c8ed
JH
3075
3076/*
3077Return:
e9166683
JH
3078 0 good, rcpt results in addr->transport_return (PENDING_OK, DEFER, FAIL)
3079 -1 MAIL response error
3080 -2 any non-MAIL read i/o error
3081 -3 non-MAIL response timeout
3082 -4 internal error; channel still usable
3083 -5 transmit failed
d9c3c8ed
JH
3084 */
3085
3086int
3087smtp_write_mail_and_rcpt_cmds(smtp_context * sx, int * yield)
3088{
3089address_item * addr;
c4639661 3090int address_count, pipe_limit;
d9c3c8ed
JH
3091int rc;
3092
3093if (build_mailcmd_options(sx, sx->first_addr) != OK)
3094 {
3095 *yield = ERROR;
e9166683 3096 return -4;
d9c3c8ed
JH
3097 }
3098
3099/* From here until we send the DATA command, we can make use of PIPELINING
3100if the server host supports it. The code has to be able to check the responses
3101at any point, for when the buffer fills up, so we write it totally generally.
3102When PIPELINING is off, each command written reports that it has flushed the
3103buffer. */
3104
3105sx->pending_MAIL = TRUE; /* The block starts with MAIL */
3106
3107 {
3108 uschar * s = sx->from_addr;
3109#ifdef SUPPORT_I18N
3110 uschar * errstr = NULL;
3111
3112 /* If we must downconvert, do the from-address here. Remember we had to
3113 for the to-addresses (done below), and also (ugly) for re-doing when building
3114 the delivery log line. */
3115
3116 if ( sx->addrlist->prop.utf8_msg
14de8063 3117 && (sx->addrlist->prop.utf8_downcvt || !(sx->peer_offered & OPTION_UTF8))
d9c3c8ed
JH
3118 )
3119 {
3120 if (s = string_address_utf8_to_alabel(s, &errstr), errstr)
3121 {
a55697ac 3122 set_errno_nohost(sx->addrlist, ERRNO_EXPANDFAIL, errstr, DEFER, FALSE, &sx->delivery_start);
d9c3c8ed 3123 *yield = ERROR;
e9166683 3124 return -4;
d9c3c8ed
JH
3125 }
3126 setflag(sx->addrlist, af_utf8_downcvt);
3127 }
3128#endif
3129
251b9eb4 3130 rc = smtp_write_command(sx, pipelining_active ? SCMD_BUFFER : SCMD_FLUSH,
d9c3c8ed
JH
3131 "MAIL FROM:<%s>%s\r\n", s, sx->buffer);
3132 }
3133
3134mail_command = string_copy(big_buffer); /* Save for later error message */
3135
3136switch(rc)
3137 {
3138 case -1: /* Transmission error */
e9166683 3139 return -5;
d9c3c8ed 3140
df5b41e3 3141 case +1: /* Cmd was sent */
251b9eb4 3142 if (!smtp_read_response(sx, sx->buffer, sizeof(sx->buffer), '2',
ee8b8090 3143 (SOB sx->conn_args.ob)->command_timeout))
d9c3c8ed
JH
3144 {
3145 if (errno == 0 && sx->buffer[0] == '4')
3146 {
3147 errno = ERRNO_MAIL4XX;
3148 sx->addrlist->more_errno |= ((sx->buffer[1] - '0')*10 + sx->buffer[2] - '0') << 8;
3149 }
3150 return -1;
3151 }
3152 sx->pending_MAIL = FALSE;
3153 break;
e9166683
JH
3154
3155 /* otherwise zero: command queued for pipeline */
d9c3c8ed
JH
3156 }
3157
3158/* Pass over all the relevant recipient addresses for this host, which are the
3159ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
3160several before we have to read the responses for those seen so far. This
3161checking is done by a subroutine because it also needs to be done at the end.
3162Send only up to max_rcpt addresses at a time, leaving next_addr pointing to
3163the next one if not all are sent.
3164
3165In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
3166last address because we want to abort if any recipients have any kind of
3167problem, temporary or permanent. We know that all recipient addresses will have
3168the PENDING_DEFER status, because only one attempt is ever made, and we know
e9166683
JH
3169that max_rcpt will be large, so all addresses will be done at once.
3170
3171For verify we flush the pipeline after any (the only) rcpt address. */
d9c3c8ed 3172
c4639661 3173for (addr = sx->first_addr, address_count = 0, pipe_limit = 100;
d9c3c8ed
JH
3174 addr && address_count < sx->max_rcpt;
3175 addr = addr->next) if (addr->transport_return == PENDING_DEFER)
3176 {
c4639661 3177 int cmds_sent;
d9c3c8ed
JH
3178 BOOL no_flush;
3179 uschar * rcpt_addr;
3180
14de8063 3181 addr->dsn_aware = sx->peer_offered & OPTION_DSN
d9c3c8ed
JH
3182 ? dsn_support_yes : dsn_support_no;
3183
3184 address_count++;
c4639661
JH
3185 if (pipe_limit-- <= 0)
3186 { no_flush = FALSE; pipe_limit = 100; }
3187 else
3188 no_flush = pipelining_active && !sx->verify
4c2471ca 3189 && (!mua_wrapper || addr->next && address_count < sx->max_rcpt);
d9c3c8ed
JH
3190
3191 build_rcptcmd_options(sx, addr);
3192
3193 /* Now send the RCPT command, and process outstanding responses when
3194 necessary. After a timeout on RCPT, we just end the function, leaving the
3195 yield as OK, because this error can often mean that there is a problem with
3196 just one address, so we don't want to delay the host. */
3197
ee8b8090 3198 rcpt_addr = transport_rcpt_address(addr, sx->conn_args.tblock->rcpt_include_affixes);
d9c3c8ed
JH
3199
3200#ifdef SUPPORT_I18N
3201 if ( testflag(sx->addrlist, af_utf8_downcvt)
3202 && !(rcpt_addr = string_address_utf8_to_alabel(rcpt_addr, NULL))
3203 )
3204 {
3205 /*XXX could we use a per-address errstr here? Not fail the whole send? */
3206 errno = ERRNO_EXPANDFAIL;
e9166683 3207 return -5; /*XXX too harsh? */
d9c3c8ed
JH
3208 }
3209#endif
3210
c4639661 3211 cmds_sent = smtp_write_command(sx, no_flush ? SCMD_BUFFER : SCMD_FLUSH,
4e910c01 3212 "RCPT TO:<%s>%s%s\r\n", rcpt_addr, sx->igquotstr, sx->buffer);
d9c3c8ed