Merge remote-tracking branch 'exim_github/pr/16'
[exim.git] / src / src / transports / smtp.c
CommitLineData
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1/*************************************************
2* Exim - an Internet mail transport agent *
3*************************************************/
4
5a66c31b 5/* Copyright (c) University of Cambridge 1995 - 2014 */
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6/* See the file NOTICE for conditions of use and distribution. */
7
8#include "../exim.h"
9#include "smtp.h"
10
11#define PENDING 256
12#define PENDING_DEFER (PENDING + DEFER)
13#define PENDING_OK (PENDING + OK)
14
15
16/* Options specific to the smtp transport. This transport also supports LMTP
17over TCP/IP. The options must be in alphabetic order (note that "_" comes
18before the lower case letters). Some live in the transport_instance block so as
19to be publicly visible; these are flagged with opt_public. */
20
21optionlist smtp_transport_options[] = {
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22 { "address_retry_include_sender", opt_bool,
23 (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) },
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24 { "allow_localhost", opt_bool,
25 (void *)offsetof(smtp_transport_options_block, allow_localhost) },
26 { "authenticated_sender", opt_stringptr,
27 (void *)offsetof(smtp_transport_options_block, authenticated_sender) },
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28 { "authenticated_sender_force", opt_bool,
29 (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) },
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30 { "command_timeout", opt_time,
31 (void *)offsetof(smtp_transport_options_block, command_timeout) },
32 { "connect_timeout", opt_time,
33 (void *)offsetof(smtp_transport_options_block, connect_timeout) },
34 { "connection_max_messages", opt_int | opt_public,
35 (void *)offsetof(transport_instance, connection_max_messages) },
36 { "data_timeout", opt_time,
37 (void *)offsetof(smtp_transport_options_block, data_timeout) },
38 { "delay_after_cutoff", opt_bool,
39 (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) },
80a47a2c 40#ifndef DISABLE_DKIM
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41 { "dkim_canon", opt_stringptr,
42 (void *)offsetof(smtp_transport_options_block, dkim_canon) },
43 { "dkim_domain", opt_stringptr,
44 (void *)offsetof(smtp_transport_options_block, dkim_domain) },
45 { "dkim_private_key", opt_stringptr,
46 (void *)offsetof(smtp_transport_options_block, dkim_private_key) },
47 { "dkim_selector", opt_stringptr,
48 (void *)offsetof(smtp_transport_options_block, dkim_selector) },
49 { "dkim_sign_headers", opt_stringptr,
50 (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) },
51 { "dkim_strict", opt_stringptr,
52 (void *)offsetof(smtp_transport_options_block, dkim_strict) },
80a47a2c 53#endif
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54 { "dns_qualify_single", opt_bool,
55 (void *)offsetof(smtp_transport_options_block, dns_qualify_single) },
56 { "dns_search_parents", opt_bool,
57 (void *)offsetof(smtp_transport_options_block, dns_search_parents) },
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58 { "dnssec_request_domains", opt_stringptr,
59 (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) },
60 { "dnssec_require_domains", opt_stringptr,
61 (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) },
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62 { "dscp", opt_stringptr,
63 (void *)offsetof(smtp_transport_options_block, dscp) },
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64 { "fallback_hosts", opt_stringptr,
65 (void *)offsetof(smtp_transport_options_block, fallback_hosts) },
66 { "final_timeout", opt_time,
67 (void *)offsetof(smtp_transport_options_block, final_timeout) },
68 { "gethostbyname", opt_bool,
69 (void *)offsetof(smtp_transport_options_block, gethostbyname) },
80a47a2c 70#ifdef SUPPORT_TLS
b1770b6e 71 /* These are no longer honoured, as of Exim 4.80; for now, we silently
2d571266 72 ignore; 4.83 will warn, and a later-still release will remove
17c76198 73 these options, so that using them becomes an error. */
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74 { "gnutls_require_kx", opt_stringptr,
75 (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) },
76 { "gnutls_require_mac", opt_stringptr,
77 (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) },
78 { "gnutls_require_protocols", opt_stringptr,
79 (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) },
80a47a2c 80#endif
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81 { "helo_data", opt_stringptr,
82 (void *)offsetof(smtp_transport_options_block, helo_data) },
83 { "hosts", opt_stringptr,
84 (void *)offsetof(smtp_transport_options_block, hosts) },
85 { "hosts_avoid_esmtp", opt_stringptr,
86 (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) },
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87 { "hosts_avoid_pipelining", opt_stringptr,
88 (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) },
80a47a2c 89#ifdef SUPPORT_TLS
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90 { "hosts_avoid_tls", opt_stringptr,
91 (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) },
80a47a2c 92#endif
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93 { "hosts_max_try", opt_int,
94 (void *)offsetof(smtp_transport_options_block, hosts_max_try) },
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95 { "hosts_max_try_hardlimit", opt_int,
96 (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) },
80a47a2c 97#ifdef SUPPORT_TLS
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98 { "hosts_nopass_tls", opt_stringptr,
99 (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) },
80a47a2c 100#endif
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101 { "hosts_override", opt_bool,
102 (void *)offsetof(smtp_transport_options_block, hosts_override) },
103 { "hosts_randomize", opt_bool,
104 (void *)offsetof(smtp_transport_options_block, hosts_randomize) },
f2de3a33 105#if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP)
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106 { "hosts_request_ocsp", opt_stringptr,
107 (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) },
108#endif
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109 { "hosts_require_auth", opt_stringptr,
110 (void *)offsetof(smtp_transport_options_block, hosts_require_auth) },
80a47a2c 111#ifdef SUPPORT_TLS
f2de3a33 112# ifndef DISABLE_OCSP
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113 { "hosts_require_ocsp", opt_stringptr,
114 (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) },
115# endif
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116 { "hosts_require_tls", opt_stringptr,
117 (void *)offsetof(smtp_transport_options_block, hosts_require_tls) },
80a47a2c 118#endif
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119 { "hosts_try_auth", opt_stringptr,
120 (void *)offsetof(smtp_transport_options_block, hosts_try_auth) },
8ccd00b1 121#ifndef DISABLE_PRDR
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122 { "hosts_try_prdr", opt_stringptr,
123 (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) },
124#endif
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125#ifdef SUPPORT_TLS
126 { "hosts_verify_avoid_tls", opt_stringptr,
127 (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) },
128#endif
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129 { "interface", opt_stringptr,
130 (void *)offsetof(smtp_transport_options_block, interface) },
131 { "keepalive", opt_bool,
132 (void *)offsetof(smtp_transport_options_block, keepalive) },
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133 { "lmtp_ignore_quota", opt_bool,
134 (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) },
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135 { "max_rcpt", opt_int | opt_public,
136 (void *)offsetof(transport_instance, max_addresses) },
137 { "multi_domain", opt_bool | opt_public,
138 (void *)offsetof(transport_instance, multi_domain) },
139 { "port", opt_stringptr,
140 (void *)offsetof(smtp_transport_options_block, port) },
141 { "protocol", opt_stringptr,
142 (void *)offsetof(smtp_transport_options_block, protocol) },
143 { "retry_include_ip_address", opt_bool,
144 (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) },
145 { "serialize_hosts", opt_stringptr,
146 (void *)offsetof(smtp_transport_options_block, serialize_hosts) },
147 { "size_addition", opt_int,
148 (void *)offsetof(smtp_transport_options_block, size_addition) }
80a47a2c 149#ifdef SUPPORT_TLS
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150 ,{ "tls_certificate", opt_stringptr,
151 (void *)offsetof(smtp_transport_options_block, tls_certificate) },
152 { "tls_crl", opt_stringptr,
153 (void *)offsetof(smtp_transport_options_block, tls_crl) },
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154 { "tls_dh_min_bits", opt_int,
155 (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) },
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156 { "tls_privatekey", opt_stringptr,
157 (void *)offsetof(smtp_transport_options_block, tls_privatekey) },
3f0945ff 158 { "tls_require_ciphers", opt_stringptr,
0756eb3c 159 (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) },
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160 { "tls_sni", opt_stringptr,
161 (void *)offsetof(smtp_transport_options_block, tls_sni) },
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162 { "tls_tempfail_tryclear", opt_bool,
163 (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) },
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164 { "tls_try_verify_hosts", opt_stringptr,
165 (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) },
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166#ifdef EXPERIMENTAL_CERTNAMES
167 { "tls_verify_cert_hostnames", opt_stringptr,
168 (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)},
169#endif
0756eb3c 170 { "tls_verify_certificates", opt_stringptr,
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171 (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) },
172 { "tls_verify_hosts", opt_stringptr,
173 (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) }
80a47a2c 174#endif
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175#ifdef EXPERIMENTAL_TPDA
176 ,{ "tpda_host_defer_action", opt_stringptr,
177 (void *)offsetof(smtp_transport_options_block, tpda_host_defer_action) },
178#endif
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179};
180
181/* Size of the options list. An extern variable has to be used so that its
182address can appear in the tables drtables.c. */
183
184int smtp_transport_options_count =
185 sizeof(smtp_transport_options)/sizeof(optionlist);
186
187/* Default private options block for the smtp transport. */
188
189smtp_transport_options_block smtp_transport_option_defaults = {
190 NULL, /* hosts */
191 NULL, /* fallback_hosts */
192 NULL, /* hostlist */
193 NULL, /* fallback_hostlist */
194 NULL, /* authenticated_sender */
195 US"$primary_hostname", /* helo_data */
196 NULL, /* interface */
197 NULL, /* port */
198 US"smtp", /* protocol */
9e4f5962 199 NULL, /* DSCP */
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200 NULL, /* serialize_hosts */
201 NULL, /* hosts_try_auth */
202 NULL, /* hosts_require_auth */
8ccd00b1 203#ifndef DISABLE_PRDR
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204 NULL, /* hosts_try_prdr */
205#endif
f2de3a33 206#ifndef DISABLE_OCSP
44662487 207 US"*", /* hosts_request_ocsp */
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208 NULL, /* hosts_require_ocsp */
209#endif
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210 NULL, /* hosts_require_tls */
211 NULL, /* hosts_avoid_tls */
99400968 212 US"*", /* hosts_verify_avoid_tls */
c51b8e75 213 NULL, /* hosts_avoid_pipelining */
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214 NULL, /* hosts_avoid_esmtp */
215 NULL, /* hosts_nopass_tls */
216 5*60, /* command_timeout */
217 5*60, /* connect_timeout; shorter system default overrides */
218 5*60, /* data timeout */
219 10*60, /* final timeout */
220 1024, /* size_addition */
221 5, /* hosts_max_try */
8e669ac1 222 50, /* hosts_max_try_hardlimit */
48c7f9e2 223 TRUE, /* address_retry_include_sender */
0756eb3c 224 FALSE, /* allow_localhost */
382afc6b 225 FALSE, /* authenticated_sender_force */
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226 FALSE, /* gethostbyname */
227 TRUE, /* dns_qualify_single */
228 FALSE, /* dns_search_parents */
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229 NULL, /* dnssec_request_domains */
230 NULL, /* dnssec_require_domains */
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231 TRUE, /* delay_after_cutoff */
232 FALSE, /* hosts_override */
233 FALSE, /* hosts_randomize */
234 TRUE, /* keepalive */
f1513293 235 FALSE, /* lmtp_ignore_quota */
0756eb3c 236 TRUE /* retry_include_ip_address */
80a47a2c 237#ifdef SUPPORT_TLS
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238 ,NULL, /* tls_certificate */
239 NULL, /* tls_crl */
240 NULL, /* tls_privatekey */
241 NULL, /* tls_require_ciphers */
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242 NULL, /* gnutls_require_kx */
243 NULL, /* gnutls_require_mac */
244 NULL, /* gnutls_require_proto */
54c90be1 245 NULL, /* tls_sni */
0756eb3c 246 NULL, /* tls_verify_certificates */
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247 EXIM_CLIENT_DH_DEFAULT_MIN_BITS,
248 /* tls_dh_min_bits */
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249 TRUE, /* tls_tempfail_tryclear */
250 NULL, /* tls_verify_hosts */
251 NULL /* tls_try_verify_hosts */
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252# ifdef EXPERIMENTAL_CERTNAMES
253 ,NULL /* tls_verify_cert_hostnames */
254# endif
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255#endif
256#ifndef DISABLE_DKIM
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257 ,NULL, /* dkim_canon */
258 NULL, /* dkim_domain */
259 NULL, /* dkim_private_key */
260 NULL, /* dkim_selector */
261 NULL, /* dkim_sign_headers */
262 NULL /* dkim_strict */
80a47a2c 263#endif
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264#ifdef EXPERIMENTAL_TPDA
265 ,NULL /* tpda_host_defer_action */
266#endif
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267};
268
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269#ifdef EXPERIMENTAL_DSN
270/* some DSN flags for use later */
271
272static int rf_list[] = {rf_notify_never, rf_notify_success,
273 rf_notify_failure, rf_notify_delay };
274
275static uschar *rf_names[] = { "NEVER", "SUCCESS", "FAILURE", "DELAY" };
276#endif
277
278
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279
280/* Local statics */
281
282static uschar *smtp_command; /* Points to last cmd for error messages */
283static uschar *mail_command; /* Points to MAIL cmd for error messages */
f6c332bd 284static BOOL update_waiting; /* TRUE to update the "wait" database */
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285
286
287/*************************************************
288* Setup entry point *
289*************************************************/
290
291/* This function is called when the transport is about to be used,
292but before running it in a sub-process. It is used for two things:
293
294 (1) To set the fallback host list in addresses, when delivering.
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295 (2) To pass back the interface, port, protocol, and other options, for use
296 during callout verification.
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297
298Arguments:
299 tblock pointer to the transport instance block
300 addrlist list of addresses about to be transported
301 tf if not NULL, pointer to block in which to return options
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302 uid the uid that will be set (not used)
303 gid the gid that will be set (not used)
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304 errmsg place for error message (not used)
305
306Returns: OK always (FAIL, DEFER not used)
307*/
308
309static int
310smtp_transport_setup(transport_instance *tblock, address_item *addrlist,
929ba01c 311 transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg)
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312{
313smtp_transport_options_block *ob =
314 (smtp_transport_options_block *)(tblock->options_block);
315
316errmsg = errmsg; /* Keep picky compilers happy */
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317uid = uid;
318gid = gid;
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319
320/* Pass back options if required. This interface is getting very messy. */
321
322if (tf != NULL)
323 {
324 tf->interface = ob->interface;
325 tf->port = ob->port;
326 tf->protocol = ob->protocol;
327 tf->hosts = ob->hosts;
328 tf->hosts_override = ob->hosts_override;
329 tf->hosts_randomize = ob->hosts_randomize;
330 tf->gethostbyname = ob->gethostbyname;
331 tf->qualify_single = ob->dns_qualify_single;
332 tf->search_parents = ob->dns_search_parents;
26da7e20 333 tf->helo_data = ob->helo_data;
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334 }
335
336/* Set the fallback host list for all the addresses that don't have fallback
337host lists, provided that the local host wasn't present in the original host
338list. */
339
340if (!testflag(addrlist, af_local_host_removed))
341 {
342 for (; addrlist != NULL; addrlist = addrlist->next)
343 if (addrlist->fallback_hosts == NULL)
344 addrlist->fallback_hosts = ob->fallback_hostlist;
345 }
346
347return OK;
348}
349
350
351
352/*************************************************
353* Initialization entry point *
354*************************************************/
355
356/* Called for each instance, after its options have been read, to
357enable consistency checks to be done, or anything else that needs
358to be set up.
359
360Argument: pointer to the transport instance block
361Returns: nothing
362*/
363
364void
365smtp_transport_init(transport_instance *tblock)
366{
367smtp_transport_options_block *ob =
368 (smtp_transport_options_block *)(tblock->options_block);
369
370/* Retry_use_local_part defaults FALSE if unset */
371
372if (tblock->retry_use_local_part == TRUE_UNSET)
373 tblock->retry_use_local_part = FALSE;
374
375/* Set the default port according to the protocol */
376
377if (ob->port == NULL)
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378 ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" :
379 (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp";
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380
381/* Set up the setup entry point, to be called before subprocesses for this
382transport. */
383
384tblock->setup = smtp_transport_setup;
385
386/* Complain if any of the timeouts are zero. */
387
388if (ob->command_timeout <= 0 || ob->data_timeout <= 0 ||
389 ob->final_timeout <= 0)
390 log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
391 "command, data, or final timeout value is zero for %s transport",
392 tblock->name);
393
394/* If hosts_override is set and there are local hosts, set the global
395flag that stops verify from showing router hosts. */
396
397if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE;
398
399/* If there are any fallback hosts listed, build a chain of host items
400for them, but do not do any lookups at this time. */
401
402host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE);
2d571266 403
32d07012 404#ifdef SUPPORT_TLS
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405if ( ob->gnutls_require_kx
406 || ob->gnutls_require_mac
407 || ob->gnutls_require_proto)
408 log_write(0, LOG_MAIN, "WARNING: smtp transport options"
409 " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols"
410 " are obsolete\n");
32d07012 411#endif
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412}
413
414
415
416
417
418/*************************************************
419* Set delivery info into all active addresses *
420*************************************************/
421
422/* Only addresses whose status is >= PENDING are relevant. A lesser
423status means that an address is not currently being processed.
424
425Arguments:
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426 addrlist points to a chain of addresses
427 errno_value to put in each address's errno field
428 msg to put in each address's message field
429 rc to put in each address's transport_return field
430 pass_message if TRUE, set the "pass message" flag in the address
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431
432If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in
433the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate
434this particular type of timeout.
435
436Returns: nothing
437*/
438
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439static void
440set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc,
447d236c 441 BOOL pass_message)
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442{
443address_item *addr;
444int orvalue = 0;
445if (errno_value == ERRNO_CONNECTTIMEOUT)
446 {
447 errno_value = ETIMEDOUT;
448 orvalue = RTEF_CTOUT;
449 }
450for (addr = addrlist; addr != NULL; addr = addr->next)
451 {
452 if (addr->transport_return < PENDING) continue;
453 addr->basic_errno = errno_value;
454 addr->more_errno |= orvalue;
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455 if (msg != NULL)
456 {
457 addr->message = msg;
458 if (pass_message) setflag(addr, af_pass_message);
459 }
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460 addr->transport_return = rc;
461 }
462}
463
464
465
466/*************************************************
467* Check an SMTP response *
468*************************************************/
469
470/* This function is given an errno code and the SMTP response buffer
471to analyse, together with the host identification for generating messages. It
472sets an appropriate message and puts the first digit of the response code into
473the yield variable. If no response was actually read, a suitable digit is
474chosen.
475
476Arguments:
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477 host the current host, to get its name for messages
478 errno_value pointer to the errno value
479 more_errno from the top address for use with ERRNO_FILTER_FAIL
480 buffer the SMTP response buffer
481 yield where to put a one-digit SMTP response code
482 message where to put an errror message
483 pass_message set TRUE if message is an SMTP response
484
485Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE
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486*/
487
488static BOOL check_response(host_item *host, int *errno_value, int more_errno,
447d236c 489 uschar *buffer, int *yield, uschar **message, BOOL *pass_message)
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490{
491uschar *pl = US"";
492
493if (smtp_use_pipelining &&
494 (Ustrcmp(smtp_command, "MAIL") == 0 ||
495 Ustrcmp(smtp_command, "RCPT") == 0 ||
496 Ustrcmp(smtp_command, "DATA") == 0))
497 pl = US"pipelined ";
498
499*yield = '4'; /* Default setting is to give a temporary error */
500
501/* Handle response timeout */
502
503if (*errno_value == ETIMEDOUT)
504 {
505 *message = US string_sprintf("SMTP timeout while connected to %s [%s] "
506 "after %s%s", host->name, host->address, pl, smtp_command);
507 if (transport_count > 0)
508 *message = US string_sprintf("%s (%d bytes written)", *message,
509 transport_count);
510 return FALSE;
511 }
512
513/* Handle malformed SMTP response */
514
515if (*errno_value == ERRNO_SMTPFORMAT)
516 {
517 uschar *malfresp = string_printing(buffer);
518 while (isspace(*malfresp)) malfresp++;
519 if (*malfresp == 0)
520 *message = string_sprintf("Malformed SMTP reply (an empty line) from "
521 "%s [%s] in response to %s%s", host->name, host->address, pl,
522 smtp_command);
523 else
524 *message = string_sprintf("Malformed SMTP reply from %s [%s] in response "
525 "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp);
526 return FALSE;
527 }
528
529/* Handle a failed filter process error; can't send QUIT as we mustn't
530end the DATA. */
531
532if (*errno_value == ERRNO_FILTER_FAIL)
533 {
35af9f61 534 *message = US string_sprintf("transport filter process failed (%d)%s",
8e669ac1 535 more_errno,
35af9f61 536 (more_errno == EX_EXECFAILED)? ": unable to execute command" : "");
0756eb3c
PH
537 return FALSE;
538 }
539
540/* Handle a failed add_headers expansion; can't send QUIT as we mustn't
541end the DATA. */
542
543if (*errno_value == ERRNO_CHHEADER_FAIL)
544 {
545 *message =
546 US string_sprintf("failed to expand headers_add or headers_remove: %s",
547 expand_string_message);
548 return FALSE;
549 }
550
551/* Handle failure to write a complete data block */
552
553if (*errno_value == ERRNO_WRITEINCOMPLETE)
554 {
555 *message = US string_sprintf("failed to write a data block");
556 return FALSE;
557 }
558
559/* Handle error responses from the remote mailer. */
560
561if (buffer[0] != 0)
562 {
563 uschar *s = string_printing(buffer);
447d236c 564 *message = US string_sprintf("SMTP error from remote mail server after %s%s: "
0756eb3c 565 "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s);
447d236c 566 *pass_message = TRUE;
0756eb3c
PH
567 *yield = buffer[0];
568 return TRUE;
569 }
570
571/* No data was read. If there is no errno, this must be the EOF (i.e.
19b9dc85
PH
572connection closed) case, which causes deferral. An explicit connection reset
573error has the same effect. Otherwise, put the host's identity in the message,
574leaving the errno value to be interpreted as well. In all cases, we have to
575assume the connection is now dead. */
0756eb3c 576
19b9dc85 577if (*errno_value == 0 || *errno_value == ECONNRESET)
0756eb3c
PH
578 {
579 *errno_value = ERRNO_SMTPCLOSED;
580 *message = US string_sprintf("Remote host %s [%s] closed connection "
581 "in response to %s%s", host->name, host->address, pl, smtp_command);
582 }
583else *message = US string_sprintf("%s [%s]", host->name, host->address);
584
585return FALSE;
586}
587
588
589
590/*************************************************
591* Write error message to logs *
592*************************************************/
593
594/* This writes to the main log and to the message log.
595
596Arguments:
597 addr the address item containing error information
598 host the current host
599
600Returns: nothing
601*/
602
603static void
604write_logs(address_item *addr, host_item *host)
605{
606if (addr->message != NULL)
607 {
608 uschar *message = addr->message;
609 if (addr->basic_errno > 0)
610 message = string_sprintf("%s: %s", message, strerror(addr->basic_errno));
611 log_write(0, LOG_MAIN, "%s", message);
612 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
613 }
614else
615 {
7cd1141b
PH
616 uschar *msg =
617 ((log_extra_selector & LX_outgoing_port) != 0)?
618 string_sprintf("%s [%s]:%d", host->name, host->address,
619 (host->port == PORT_NONE)? 25 : host->port)
620 :
621 string_sprintf("%s [%s]", host->name, host->address);
622 log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno));
623 deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg,
0756eb3c
PH
624 strerror(addr->basic_errno));
625 }
626}
627
628
629
d68218c7
JH
630#ifdef EXPERIMENTAL_TPDA
631/*************************************************
632* Post-defer action *
633*************************************************/
634
635/* This expands an arbitrary per-transport string.
636 It might, for example, be used to write to the database log.
637
638Arguments:
639 ob transport options block
640 addr the address item containing error information
641 host the current host
642
643Returns: nothing
644*/
645
646static void
647tpda_deferred(smtp_transport_options_block *ob, address_item *addr, host_item *host)
648{
649uschar *action = ob->tpda_host_defer_action;
650if (!action)
651 return;
652
653tpda_delivery_ip = string_copy(host->address);
654tpda_delivery_port = (host->port == PORT_NONE)? 25 : host->port;
655tpda_delivery_fqdn = string_copy(host->name);
656tpda_delivery_local_part = string_copy(addr->local_part);
657tpda_delivery_domain = string_copy(addr->domain);
658tpda_defer_errno = addr->basic_errno;
659
660tpda_defer_errstr = addr->message
661 ? addr->basic_errno > 0
662 ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno))
663 : string_copy(addr->message)
664 : addr->basic_errno > 0
e3dd1d67 665 ? string_copy(US strerror(addr->basic_errno))
d68218c7
JH
666 : NULL;
667
668DEBUG(D_transport)
669 debug_printf(" TPDA(host defer): tpda_host_defer_action=|%s| tpda_delivery_IP=%s\n",
670 action, tpda_delivery_ip);
671
672router_name = addr->router->name;
673transport_name = addr->transport->name;
674if (!expand_string(action) && *expand_string_message)
675 log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand tpda_defer_action in %s: %s\n",
676 transport_name, expand_string_message);
677router_name = transport_name = NULL;
678}
679#endif
680
681
682
0756eb3c
PH
683/*************************************************
684* Synchronize SMTP responses *
685*************************************************/
686
687/* This function is called from smtp_deliver() to receive SMTP responses from
688the server, and match them up with the commands to which they relate. When
689PIPELINING is not in use, this function is called after every command, and is
690therefore somewhat over-engineered, but it is simpler to use a single scheme
691that works both with and without PIPELINING instead of having two separate sets
692of code.
693
694The set of commands that are buffered up with pipelining may start with MAIL
695and may end with DATA; in between are RCPT commands that correspond to the
696addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH,
697etc.) are never buffered.
698
699Errors after MAIL or DATA abort the whole process leaving the response in the
700buffer. After MAIL, pending responses are flushed, and the original command is
701re-instated in big_buffer for error messages. For RCPT commands, the remote is
702permitted to reject some recipient addresses while accepting others. However
703certain errors clearly abort the whole process. Set the value in
704transport_return to PENDING_OK if the address is accepted. If there is a
705subsequent general error, it will get reset accordingly. If not, it will get
706converted to OK at the end.
707
708Arguments:
48c7f9e2
PH
709 addrlist the complete address list
710 include_affixes TRUE if affixes include in RCPT
711 sync_addr ptr to the ptr of the one to start scanning at (updated)
712 host the host we are connected to
713 count the number of responses to read
714 address_retry_
715 include_sender true if 4xx retry is to include the sender it its key
716 pending_MAIL true if the first response is for MAIL
717 pending_DATA 0 if last command sent was not DATA
718 +1 if previously had a good recipient
719 -1 if not previously had a good recipient
720 inblock incoming SMTP block
721 timeout timeout value
722 buffer buffer for reading response
723 buffsize size of buffer
0756eb3c
PH
724
725Returns: 3 if at least one address had 2xx and one had 5xx
726 2 if at least one address had 5xx but none had 2xx
727 1 if at least one host had a 2xx response, but none had 5xx
728 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA)
729 -1 timeout while reading RCPT response
730 -2 I/O or other non-response error for RCPT
731 -3 DATA or MAIL failed - errno and buffer set
732*/
733
734static int
735sync_responses(address_item *addrlist, BOOL include_affixes,
48c7f9e2
PH
736 address_item **sync_addr, host_item *host, int count,
737 BOOL address_retry_include_sender, BOOL pending_MAIL,
0756eb3c
PH
738 int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer,
739 int buffsize)
740{
741address_item *addr = *sync_addr;
742int yield = 0;
743
744/* Handle the response for a MAIL command. On error, reinstate the original
745command in big_buffer for error message use, and flush any further pending
746responses before returning, except after I/O errors and timeouts. */
747
748if (pending_MAIL)
749 {
750 count--;
751 if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout))
752 {
753 Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */
754 if (errno == 0 && buffer[0] != 0)
755 {
756 uschar flushbuffer[4096];
e97957bc
PH
757 int save_errno = 0;
758 if (buffer[0] == '4')
759 {
760 save_errno = ERRNO_MAIL4XX;
761 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
762 }
0756eb3c
PH
763 while (count-- > 0)
764 {
765 if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer),
766 '2', timeout)
767 && (errno != 0 || flushbuffer[0] == 0))
768 break;
769 }
e97957bc 770 errno = save_errno;
0756eb3c
PH
771 }
772 return -3;
773 }
774 }
775
776if (pending_DATA) count--; /* Number of RCPT responses to come */
777
778/* Read and handle the required number of RCPT responses, matching each one up
779with an address by scanning for the next address whose status is PENDING_DEFER.
780*/
781
782while (count-- > 0)
783 {
784 while (addr->transport_return != PENDING_DEFER) addr = addr->next;
785
786 /* The address was accepted */
787
788 if (smtp_read_response(inblock, buffer, buffsize, '2', timeout))
789 {
790 yield |= 1;
791 addr->transport_return = PENDING_OK;
792
793 /* If af_dr_retry_exists is set, there was a routing delay on this address;
09945f1e
PH
794 ensure that any address-specific retry record is expunged. We do this both
795 for the basic key and for the version that also includes the sender. */
0756eb3c
PH
796
797 if (testflag(addr, af_dr_retry_exists))
09945f1e
PH
798 {
799 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
800 sender_address);
801 retry_add_item(addr, altkey, rf_delete);
0756eb3c 802 retry_add_item(addr, addr->address_retry_key, rf_delete);
09945f1e 803 }
0756eb3c
PH
804 }
805
806 /* Timeout while reading the response */
807
808 else if (errno == ETIMEDOUT)
809 {
810 int save_errno = errno;
811 uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] "
812 "after RCPT TO:<%s>", host->name, host->address,
813 transport_rcpt_address(addr, include_affixes));
447d236c 814 set_errno(addrlist, save_errno, message, DEFER, FALSE);
0756eb3c 815 retry_add_item(addr, addr->address_retry_key, 0);
f6c332bd 816 update_waiting = FALSE;
0756eb3c
PH
817 return -1;
818 }
819
820 /* Handle other errors in obtaining an SMTP response by returning -1. This
821 will cause all the addresses to be deferred. Restore the SMTP command in
822 big_buffer for which we are checking the response, so the error message
823 makes sense. */
824
825 else if (errno != 0 || buffer[0] == 0)
826 {
827 string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>",
828 transport_rcpt_address(addr, include_affixes));
829 return -2;
830 }
831
832 /* Handle SMTP permanent and temporary response codes. */
833
834 else
835 {
836 addr->message =
447d236c 837 string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: "
0756eb3c
PH
838 "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes),
839 host->name, host->address, string_printing(buffer));
447d236c 840 setflag(addr, af_pass_message);
0756eb3c
PH
841 deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message);
842
843 /* The response was 5xx */
844
845 if (buffer[0] == '5')
846 {
847 addr->transport_return = FAIL;
848 yield |= 2;
849 }
850
851 /* The response was 4xx */
852
853 else
854 {
0756eb3c
PH
855 addr->transport_return = DEFER;
856 addr->basic_errno = ERRNO_RCPT4XX;
e97957bc 857 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
0756eb3c
PH
858
859 /* Log temporary errors if there are more hosts to be tried. */
860
861 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message);
862
f6c332bd
PH
863 /* Do not put this message on the list of those waiting for specific
864 hosts, as otherwise it is likely to be tried too often. */
0756eb3c 865
f6c332bd 866 update_waiting = FALSE;
0756eb3c 867
48c7f9e2
PH
868 /* Add a retry item for the address so that it doesn't get tried again
869 too soon. If address_retry_include_sender is true, add the sender address
870 to the retry key. */
0756eb3c 871
48c7f9e2
PH
872 if (address_retry_include_sender)
873 {
874 uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key,
875 sender_address);
876 retry_add_item(addr, altkey, 0);
877 }
878 else retry_add_item(addr, addr->address_retry_key, 0);
0756eb3c
PH
879 }
880 }
881 } /* Loop for next RCPT response */
882
883/* Update where to start at for the next block of responses, unless we
884have already handled all the addresses. */
885
886if (addr != NULL) *sync_addr = addr->next;
887
888/* Handle a response to DATA. If we have not had any good recipients, either
889previously or in this block, the response is ignored. */
890
891if (pending_DATA != 0 &&
892 !smtp_read_response(inblock, buffer, buffsize, '3', timeout))
893 {
894 int code;
895 uschar *msg;
447d236c 896 BOOL pass_message;
e97957bc
PH
897 if (pending_DATA > 0 || (yield & 1) != 0)
898 {
899 if (errno == 0 && buffer[0] == '4')
900 {
901 errno = ERRNO_DATA4XX;
902 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
903 }
904 return -3;
905 }
447d236c 906 (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message);
0756eb3c
PH
907 DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining "
908 "is in use and there were no good recipients\n", msg);
909 }
910
911/* All responses read and handled; MAIL (if present) received 2xx and DATA (if
912present) received 3xx. If any RCPTs were handled and yielded anything other
913than 4xx, yield will be set non-zero. */
914
915return yield;
916}
917
918
919
fcc8e047
JH
920/* Do the client side of smtp-level authentication */
921/*
922Arguments:
923 buffer EHLO response from server (gets overwritten)
924 addrlist chain of potential addresses to deliver
925 host host to deliver to
926 ob transport options
927 ibp, obp comms channel control blocks
928
929Returns:
930 OK Success, or failed (but not required): global "smtp_authenticated" set
931 DEFER Failed authentication (and was required)
932 ERROR Internal problem
933
934 FAIL_SEND Failed communications - transmit
935 FAIL - response
936*/
937
938int
939smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host,
940 smtp_transport_options_block *ob, BOOL is_esmtp,
941 smtp_inblock *ibp, smtp_outblock *obp)
942{
943 int require_auth;
944 uschar *fail_reason = US"server did not advertise AUTH support";
945
946 smtp_authenticated = FALSE;
947 client_authenticator = client_authenticated_id = client_authenticated_sender = NULL;
948 require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL,
949 host->name, host->address, NULL);
950
951 if (is_esmtp && !regex_AUTH) regex_AUTH =
952 regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)",
953 FALSE, TRUE);
954
955 if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1))
956 {
957 uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]);
958 expand_nmax = -1; /* reset */
959
960 /* Must not do this check until after we have saved the result of the
961 regex match above. */
962
963 if (require_auth == OK ||
964 verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name,
965 host->address, NULL) == OK)
966 {
967 auth_instance *au;
968 fail_reason = US"no common mechanisms were found";
969
970 DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n");
971
972 /* Scan the configured authenticators looking for one which is configured
973 for use as a client, which is not suppressed by client_condition, and
974 whose name matches an authentication mechanism supported by the server.
975 If one is found, attempt to authenticate by calling its client function.
976 */
977
978 for (au = auths; !smtp_authenticated && au != NULL; au = au->next)
979 {
980 uschar *p = names;
981 if (!au->client ||
982 (au->client_condition != NULL &&
983 !expand_check_condition(au->client_condition, au->name,
984 US"client authenticator")))
985 {
986 DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n",
987 au->name,
988 (au->client)? "client_condition is false" :
989 "not configured as a client");
990 continue;
991 }
992
993 /* Loop to scan supported server mechanisms */
994
995 while (*p != 0)
996 {
997 int rc;
998 int len = Ustrlen(au->public_name);
999 while (isspace(*p)) p++;
1000
1001 if (strncmpic(au->public_name, p, len) != 0 ||
1002 (p[len] != 0 && !isspace(p[len])))
1003 {
1004 while (*p != 0 && !isspace(*p)) p++;
1005 continue;
1006 }
1007
1008 /* Found data for a listed mechanism. Call its client entry. Set
1009 a flag in the outblock so that data is overwritten after sending so
1010 that reflections don't show it. */
1011
1012 fail_reason = US"authentication attempt(s) failed";
1013 obp->authenticating = TRUE;
1014 rc = (au->info->clientcode)(au, ibp, obp,
1015 ob->command_timeout, buffer, bufsize);
1016 obp->authenticating = FALSE;
1017 DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n",
1018 au->name, rc);
1019
1020 /* A temporary authentication failure must hold up delivery to
1021 this host. After a permanent authentication failure, we carry on
1022 to try other authentication methods. If all fail hard, try to
1023 deliver the message unauthenticated unless require_auth was set. */
1024
1025 switch(rc)
1026 {
1027 case OK:
1028 smtp_authenticated = TRUE; /* stops the outer loop */
1029 client_authenticator = au->name;
1030 if (au->set_client_id != NULL)
1031 client_authenticated_id = expand_string(au->set_client_id);
1032 break;
1033
1034 /* Failure after writing a command */
1035
1036 case FAIL_SEND:
1037 return FAIL_SEND;
1038
1039 /* Failure after reading a response */
1040
1041 case FAIL:
1042 if (errno != 0 || buffer[0] != '5') return FAIL;
1043 log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s",
1044 au->name, host->name, host->address, buffer);
1045 break;
1046
1047 /* Failure by some other means. In effect, the authenticator
1048 decided it wasn't prepared to handle this case. Typically this
1049 is the result of "fail" in an expansion string. Do we need to
1050 log anything here? Feb 2006: a message is now put in the buffer
1051 if logging is required. */
1052
1053 case CANCELLED:
1054 if (*buffer != 0)
1055 log_write(0, LOG_MAIN, "%s authenticator cancelled "
1056 "authentication H=%s [%s] %s", au->name, host->name,
1057 host->address, buffer);
1058 break;
1059
1060 /* Internal problem, message in buffer. */
1061
1062 case ERROR:
1063 set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE);
1064 return ERROR;
1065 }
1066
1067 break; /* If not authenticated, try next authenticator */
1068 } /* Loop for scanning supported server mechanisms */
1069 } /* Loop for further authenticators */
1070 }
1071 }
1072
1073 /* If we haven't authenticated, but are required to, give up. */
1074
1075 if (require_auth == OK && !smtp_authenticated)
1076 {
1077 set_errno(addrlist, ERRNO_AUTHFAIL,
1078 string_sprintf("authentication required but %s", fail_reason), DEFER,
1079 FALSE);
1080 return DEFER;
1081 }
4d8d62b9 1082
fcc8e047
JH
1083 return OK;
1084}
1085
1086
1087/* Construct AUTH appendix string for MAIL TO */
1088/*
1089Arguments
1090 buffer to build string
1091 addrlist chain of potential addresses to deliver
1092 ob transport options
1093
1094Globals smtp_authenticated
1095 client_authenticated_sender
1096Return True on error, otherwise buffer has (possibly empty) terminated string
1097*/
1098
1099BOOL
1100smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist,
1101 smtp_transport_options_block *ob)
1102{
1103uschar *local_authenticated_sender = authenticated_sender;
1104
1105#ifdef notdef
1106 debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N");
1107#endif
1108
1109if (ob->authenticated_sender != NULL)
1110 {
1111 uschar *new = expand_string(ob->authenticated_sender);
1112 if (new == NULL)
1113 {
1114 if (!expand_string_forcedfail)
1115 {
1116 uschar *message = string_sprintf("failed to expand "
1117 "authenticated_sender: %s", expand_string_message);
1118 set_errno(addrlist, 0, message, DEFER, FALSE);
1119 return TRUE;
1120 }
1121 }
1122 else if (new[0] != 0) local_authenticated_sender = new;
1123 }
1124
1125/* Add the authenticated sender address if present */
1126
1127if ((smtp_authenticated || ob->authenticated_sender_force) &&
1128 local_authenticated_sender != NULL)
1129 {
1130 string_format(buffer, bufsize, " AUTH=%s",
1131 auth_xtextencode(local_authenticated_sender,
1132 Ustrlen(local_authenticated_sender)));
1133 client_authenticated_sender = string_copy(local_authenticated_sender);
1134 }
1135else
1136 *buffer= 0;
1137
1138return FALSE;
1139}
1140
1141
1142
0756eb3c
PH
1143/*************************************************
1144* Deliver address list to given host *
1145*************************************************/
1146
1147/* If continue_hostname is not null, we get here only when continuing to
1148deliver down an existing channel. The channel was passed as the standard
6c512171
PH
1149input. TLS is never active on a passed channel; the previous process always
1150closes it down before passing the connection on.
0756eb3c
PH
1151
1152Otherwise, we have to make a connection to the remote host, and do the
1153initial protocol exchange.
1154
1155When running as an MUA wrapper, if the sender or any recipient is rejected,
1156temporarily or permanently, we force failure for all recipients.
1157
1158Arguments:
1159 addrlist chain of potential addresses to deliver; only those whose
1160 transport_return field is set to PENDING_DEFER are currently
1161 being processed; others should be skipped - they have either
1162 been delivered to an earlier host or IP address, or been
1163 failed by one of them.
1164 host host to deliver to
1165 host_af AF_INET or AF_INET6
2d280592 1166 port default TCP/IP port to use, in host byte order
0756eb3c
PH
1167 interface interface to bind to, or NULL
1168 tblock transport instance block
1169 copy_host TRUE if host set in addr->host_used must be copied, because
1170 it is specific to this call of the transport
1171 message_defer set TRUE if yield is OK, but all addresses were deferred
1172 because of a non-recipient, non-host failure, that is, a
1173 4xx response to MAIL FROM, DATA, or ".". This is a defer
1174 that is specific to the message.
1175 suppress_tls if TRUE, don't attempt a TLS connection - this is set for
1176 a second attempt after TLS initialization fails
1177
1178Returns: OK - the connection was made and the delivery attempted;
1179 the result for each address is in its data block.
1180 DEFER - the connection could not be made, or something failed
1181 while setting up the SMTP session, or there was a
1182 non-message-specific error, such as a timeout.
1183 ERROR - a filter command is specified for this transport,
1184 and there was a problem setting it up; OR helo_data
1185 or add_headers or authenticated_sender is specified
1186 for this transport, and the string failed to expand
1187*/
1188
1189static int
1190smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port,
1191 uschar *interface, transport_instance *tblock, BOOL copy_host,
1192 BOOL *message_defer, BOOL suppress_tls)
1193{
1194address_item *addr;
1195address_item *sync_addr;
1196address_item *first_addr = addrlist;
1197int yield = OK;
1198int address_count;
1199int save_errno;
1200int rc;
1201time_t start_delivery_time = time(NULL);
1202smtp_transport_options_block *ob =
1203 (smtp_transport_options_block *)(tblock->options_block);
1204BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0;
061b7ebd 1205BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0;
0756eb3c
PH
1206BOOL ok = FALSE;
1207BOOL send_rset = TRUE;
1208BOOL send_quit = TRUE;
1209BOOL setting_up = TRUE;
1210BOOL completed_address = FALSE;
1211BOOL esmtp = TRUE;
1212BOOL pending_MAIL;
447d236c 1213BOOL pass_message = FALSE;
8ccd00b1 1214#ifndef DISABLE_PRDR
fd98a5c6
JH
1215BOOL prdr_offered = FALSE;
1216BOOL prdr_active;
1217#endif
6c1c3d1d
WB
1218#ifdef EXPERIMENTAL_DSN
1219BOOL dsn_all_lasthop = TRUE;
1220#endif
0756eb3c
PH
1221smtp_inblock inblock;
1222smtp_outblock outblock;
1223int max_rcpt = tblock->max_addresses;
f1513293 1224uschar *igquotstr = US"";
41c7c167 1225uschar *helo_data = NULL;
0756eb3c
PH
1226uschar *message = NULL;
1227uschar new_message_id[MESSAGE_ID_LENGTH + 1];
1228uschar *p;
1229uschar buffer[4096];
1230uschar inbuffer[4096];
98470202 1231uschar outbuffer[4096];
0756eb3c
PH
1232
1233suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */
1234
1235*message_defer = FALSE;
1236smtp_command = US"initial connection";
1237if (max_rcpt == 0) max_rcpt = 999999;
1238
1239/* Set up the buffer for reading SMTP response packets. */
1240
1241inblock.buffer = inbuffer;
1242inblock.buffersize = sizeof(inbuffer);
1243inblock.ptr = inbuffer;
1244inblock.ptrend = inbuffer;
1245
1246/* Set up the buffer for holding SMTP commands while pipelining */
1247
1248outblock.buffer = outbuffer;
1249outblock.buffersize = sizeof(outbuffer);
1250outblock.ptr = outbuffer;
1251outblock.cmd_count = 0;
1252outblock.authenticating = FALSE;
1253
6c512171
PH
1254/* Reset the parameters of a TLS session. */
1255
817d9f57
JH
1256tls_out.bits = 0;
1257tls_out.cipher = NULL; /* the one we may use for this transport */
9d1c15ef
JH
1258tls_out.ourcert = NULL;
1259tls_out.peercert = NULL;
817d9f57
JH
1260tls_out.peerdn = NULL;
1261#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
1262tls_out.sni = NULL;
5b456975 1263#endif
018058b2 1264tls_out.ocsp = OCSP_NOT_REQ;
6c512171 1265
35aba663
JH
1266/* Flip the legacy TLS-related variables over to the outbound set in case
1267they're used in the context of the transport. Don't bother resetting
1268afterward as we're in a subprocess. */
1269
1270tls_modify_variables(&tls_out);
1271
061b7ebd
PP
1272#ifndef SUPPORT_TLS
1273if (smtps)
1274 {
018058b2
JH
1275 set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE);
1276 return ERROR;
061b7ebd
PP
1277 }
1278#endif
1279
0756eb3c
PH
1280/* Make a connection to the host if this isn't a continued delivery, and handle
1281the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled
1282specially so they can be identified for retries. */
1283
1284if (continue_hostname == NULL)
1285 {
1286 inblock.sock = outblock.sock =
1287 smtp_connect(host, host_af, port, interface, ob->connect_timeout,
9e4f5962 1288 ob->keepalive, ob->dscp); /* This puts port into host->port */
4311097e 1289
0756eb3c
PH
1290 if (inblock.sock < 0)
1291 {
1292 set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno,
447d236c 1293 NULL, DEFER, FALSE);
0756eb3c
PH
1294 return DEFER;
1295 }
1296
41c7c167
PH
1297 /* Expand the greeting message while waiting for the initial response. (Makes
1298 sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is
1299 delayed till here so that $sending_interface and $sending_port are set. */
1300
1301 helo_data = expand_string(ob->helo_data);
1302
0756eb3c
PH
1303 /* The first thing is to wait for an initial OK response. The dreaded "goto"
1304 is nevertheless a reasonably clean way of programming this kind of logic,
1305 where you want to escape on any error. */
1306
061b7ebd
PP
1307 if (!smtps)
1308 {
1309 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1310 ob->command_timeout)) goto RESPONSE_FAILED;
0756eb3c 1311
061b7ebd
PP
1312 /* Now check if the helo_data expansion went well, and sign off cleanly if
1313 it didn't. */
41c7c167 1314
061b7ebd
PP
1315 if (helo_data == NULL)
1316 {
1317 uschar *message = string_sprintf("failed to expand helo_data: %s",
1318 expand_string_message);
1319 set_errno(addrlist, 0, message, DEFER, FALSE);
1320 yield = DEFER;
1321 goto SEND_QUIT;
1322 }
41c7c167
PH
1323 }
1324
0756eb3c
PH
1325/** Debugging without sending a message
1326addrlist->transport_return = DEFER;
1327goto SEND_QUIT;
1328**/
1329
1330 /* Errors that occur after this point follow an SMTP command, which is
1331 left in big_buffer by smtp_write_command() for use in error messages. */
1332
1333 smtp_command = big_buffer;
1334
1335 /* Tell the remote who we are...
1336
1337 February 1998: A convention has evolved that ESMTP-speaking MTAs include the
1338 string "ESMTP" in their greeting lines, so make Exim send EHLO if the
1339 greeting is of this form. The assumption was that the far end supports it
1340 properly... but experience shows that there are some that give 5xx responses,
1341 even though the banner includes "ESMTP" (there's a bloody-minded one that
1342 says "ESMTP not spoken here"). Cope with that case.
1343
1344 September 2000: Time has passed, and it seems reasonable now to always send
1345 EHLO at the start. It is also convenient to make the change while installing
1346 the TLS stuff.
1347
1348 July 2003: Joachim Wieland met a broken server that advertises "PIPELINING"
1349 but times out after sending MAIL FROM, RCPT TO and DATA all together. There
1350 would be no way to send out the mails, so there is now a host list
1351 "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the
1352 PIPELINING problem as well. Maybe it can also be useful to cure other
1353 problems with broken servers.
1354
1355 Exim originally sent "Helo" at this point and ran for nearly a year that way.
1356 Then somebody tried it with a Microsoft mailer... It seems that all other
1357 mailers use upper case for some reason (the RFC is quite clear about case
1358 independence) so, for peace of mind, I gave in. */
1359
1360 esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL,
1361 host->name, host->address, NULL) != OK;
1362
061b7ebd
PP
1363 /* Alas; be careful, since this goto is not an error-out, so conceivably
1364 we might set data between here and the target which we assume to exist
1365 and be usable. I can see this coming back to bite us. */
1366 #ifdef SUPPORT_TLS
1367 if (smtps)
1368 {
1369 tls_offered = TRUE;
1370 suppress_tls = FALSE;
1371 ob->tls_tempfail_tryclear = FALSE;
1372 smtp_command = US"SSL-on-connect";
1373 goto TLS_NEGOTIATE;
1374 }
1375 #endif
1376
0756eb3c
PH
1377 if (esmtp)
1378 {
1379 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1380 lmtp? "LHLO" : "EHLO", helo_data) < 0)
1381 goto SEND_FAILED;
1382 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1383 ob->command_timeout))
1384 {
1385 if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED;
1386 esmtp = FALSE;
1387 }
1388 }
1389 else
1390 {
1391 DEBUG(D_transport)
1392 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
1393 }
1394
1395 if (!esmtp)
1396 {
1397 if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0)
1398 goto SEND_FAILED;
1399 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1400 ob->command_timeout)) goto RESPONSE_FAILED;
1401 }
1402
f1513293
PH
1403 /* Set IGNOREQUOTA if the response to LHLO specifies support and the
1404 lmtp_ignore_quota option was set. */
1405
1406 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1407 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1408 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1409
0756eb3c
PH
1410 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
1411
1412 #ifdef SUPPORT_TLS
1413 tls_offered = esmtp &&
1414 pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0,
1415 PCRE_EOPT, NULL, 0) >= 0;
1416 #endif
fd98a5c6 1417
8ccd00b1 1418 #ifndef DISABLE_PRDR
fd98a5c6
JH
1419 prdr_offered = esmtp &&
1420 (pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0,
1421 PCRE_EOPT, NULL, 0) >= 0) &&
1422 (verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1423 host->address, NULL) == OK);
1424
1425 if (prdr_offered)
1426 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1427 #endif
0756eb3c
PH
1428 }
1429
1430/* For continuing deliveries down the same channel, the socket is the standard
1431input, and we don't need to redo EHLO here (but may need to do so for TLS - see
1432below). Set up the pointer to where subsequent commands will be left, for
1433error messages. Note that smtp_use_size and smtp_use_pipelining will have been
1434set from the command line if they were set in the process that passed the
1435connection on. */
1436
1437else
1438 {
1439 inblock.sock = outblock.sock = fileno(stdin);
1440 smtp_command = big_buffer;
4311097e 1441 host->port = port; /* Record the port that was used */
0756eb3c
PH
1442 }
1443
1444/* If TLS is available on this connection, whether continued or not, attempt to
1445start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
1446send another EHLO - the server may give a different answer in secure mode. We
1447use a separate buffer for reading the response to STARTTLS so that if it is
1448negative, the original EHLO data is available for subsequent analysis, should
1449the client not be required to use TLS. If the response is bad, copy the buffer
1450for error analysis. */
1451
1452#ifdef SUPPORT_TLS
1453if (tls_offered && !suppress_tls &&
1454 verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name,
1455 host->address, NULL) != OK)
1456 {
1457 uschar buffer2[4096];
1458 if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0)
1459 goto SEND_FAILED;
1460
1461 /* If there is an I/O error, transmission of this message is deferred. If
1462 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
1463 false, we also defer. However, if there is a temporary rejection of STARTTLS
1464 and tls_tempfail_tryclear is true, or if there is an outright rejection of
1465 STARTTLS, we carry on. This means we will try to send the message in clear,
1466 unless the host is in hosts_require_tls (tested below). */
1467
1468 if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2',
1469 ob->command_timeout))
1470 {
0756eb3c
PH
1471 if (errno != 0 || buffer2[0] == 0 ||
1472 (buffer2[0] == '4' && !ob->tls_tempfail_tryclear))
0dda4340
TK
1473 {
1474 Ustrncpy(buffer, buffer2, sizeof(buffer));
0756eb3c 1475 goto RESPONSE_FAILED;
0dda4340 1476 }
0756eb3c
PH
1477 }
1478
1479 /* STARTTLS accepted: try to negotiate a TLS session. */
1480
1481 else
061b7ebd 1482 TLS_NEGOTIATE:
0756eb3c 1483 {
65867078 1484 int rc = tls_client_start(inblock.sock, host, addrlist, ob);
0756eb3c
PH
1485
1486 /* TLS negotiation failed; give an error. From outside, this function may
1487 be called again to try in clear on a new connection, if the options permit
1488 it for this host. */
1489
1490 if (rc != OK)
1491 {
1492 save_errno = ERRNO_TLSFAILURE;
1493 message = US"failure while setting up TLS session";
1494 send_quit = FALSE;
1495 goto TLS_FAILED;
1496 }
1497
1498 /* TLS session is set up */
1499
1500 for (addr = addrlist; addr != NULL; addr = addr->next)
1501 {
5ca2a9a1
PH
1502 if (addr->transport_return == PENDING_DEFER)
1503 {
817d9f57 1504 addr->cipher = tls_out.cipher;
9d1c15ef
JH
1505 addr->ourcert = tls_out.ourcert;
1506 addr->peercert = tls_out.peercert;
817d9f57 1507 addr->peerdn = tls_out.peerdn;
018058b2 1508 addr->ocsp = tls_out.ocsp;
5ca2a9a1 1509 }
0756eb3c
PH
1510 }
1511 }
1512 }
1513
061b7ebd
PP
1514/* if smtps, we'll have smtp_command set to something else; always safe to
1515reset it here. */
1516smtp_command = big_buffer;
1517
41c7c167
PH
1518/* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If
1519helo_data is null, we are dealing with a connection that was passed from
1520another process, and so we won't have expanded helo_data above. We have to
1521expand it here. $sending_ip_address and $sending_port are set up right at the
1522start of the Exim process (in exim.c). */
0756eb3c 1523
817d9f57 1524if (tls_out.active >= 0)
0756eb3c 1525 {
061b7ebd 1526 char *greeting_cmd;
41c7c167
PH
1527 if (helo_data == NULL)
1528 {
1529 helo_data = expand_string(ob->helo_data);
1530 if (helo_data == NULL)
1531 {
1532 uschar *message = string_sprintf("failed to expand helo_data: %s",
1533 expand_string_message);
1534 set_errno(addrlist, 0, message, DEFER, FALSE);
1535 yield = DEFER;
1536 goto SEND_QUIT;
1537 }
1538 }
1539
0d0e4455 1540 /* For SMTPS we need to wait for the initial OK response. */
061b7ebd
PP
1541 if (smtps)
1542 {
1543 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1544 ob->command_timeout)) goto RESPONSE_FAILED;
0d0e4455
PP
1545 }
1546
1547 if (esmtp)
1548 greeting_cmd = "EHLO";
1549 else
1550 {
1551 greeting_cmd = "HELO";
1552 DEBUG(D_transport)
1553 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
061b7ebd
PP
1554 }
1555
1556 if (smtp_write_command(&outblock, FALSE, "%s %s\r\n",
1557 lmtp? "LHLO" : greeting_cmd, helo_data) < 0)
0756eb3c
PH
1558 goto SEND_FAILED;
1559 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
1560 ob->command_timeout))
1561 goto RESPONSE_FAILED;
1562 }
1563
1564/* If the host is required to use a secure channel, ensure that we
1565have one. */
1566
1567else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
1568 host->address, NULL) == OK)
1569 {
1570 save_errno = ERRNO_TLSREQUIRED;
1571 message = string_sprintf("a TLS session is required for %s [%s], but %s",
1572 host->name, host->address,
1573 tls_offered? "an attempt to start TLS failed" :
1574 "the server did not offer TLS support");
1575 goto TLS_FAILED;
1576 }
1577#endif
1578
1579/* If TLS is active, we have just started it up and re-done the EHLO command,
1580so its response needs to be analyzed. If TLS is not active and this is a
1581continued session down a previously-used socket, we haven't just done EHLO, so
1582we skip this. */
1583
1584if (continue_hostname == NULL
1585 #ifdef SUPPORT_TLS
817d9f57 1586 || tls_out.active >= 0
0756eb3c
PH
1587 #endif
1588 )
1589 {
f1513293
PH
1590 /* Set for IGNOREQUOTA if the response to LHLO specifies support and the
1591 lmtp_ignore_quota option was set. */
1592
1593 igquotstr = (lmtp && ob->lmtp_ignore_quota &&
1594 pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0,
1595 PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US"";
1596
0756eb3c
PH
1597 /* If the response to EHLO specified support for the SIZE parameter, note
1598 this, provided size_addition is non-negative. */
1599
1600 smtp_use_size = esmtp && ob->size_addition >= 0 &&
1601 pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0,
1602 PCRE_EOPT, NULL, 0) >= 0;
1603
1604 /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched
c51b8e75
PH
1605 the current host, esmtp will be false, so PIPELINING can never be used. If
1606 the current host matches hosts_avoid_pipelining, don't do it. */
0756eb3c
PH
1607
1608 smtp_use_pipelining = esmtp &&
c51b8e75
PH
1609 verify_check_this_host(&(ob->hosts_avoid_pipelining), NULL, host->name,
1610 host->address, NULL) != OK &&
0756eb3c
PH
1611 pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0,
1612 PCRE_EOPT, NULL, 0) >= 0;
1613
1614 DEBUG(D_transport) debug_printf("%susing PIPELINING\n",
1615 smtp_use_pipelining? "" : "not ");
1616
8ccd00b1 1617#ifndef DISABLE_PRDR
fd98a5c6
JH
1618 prdr_offered = esmtp &&
1619 pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0,
1620 PCRE_EOPT, NULL, 0) >= 0 &&
1621 verify_check_this_host(&(ob->hosts_try_prdr), NULL, host->name,
1622 host->address, NULL) == OK;
1623
1624 if (prdr_offered)
1625 {DEBUG(D_transport) debug_printf("PRDR usable\n");}
1626#endif
1627
6c1c3d1d
WB
1628#ifdef EXPERIMENTAL_DSN
1629 /* Note if the server supports DSN */
1630 smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0,
1631 PCRE_EOPT, NULL, 0) >= 0;
1632 DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn);
1633#endif
1634
0756eb3c
PH
1635 /* Note if the response to EHLO specifies support for the AUTH extension.
1636 If it has, check that this host is one we want to authenticate to, and do
1637 the business. The host name and address must be available when the
1638 authenticator's client driver is running. */
1639
fcc8e047
JH
1640 switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host,
1641 ob, esmtp, &inblock, &outblock))
0756eb3c 1642 {
fcc8e047
JH
1643 default: goto SEND_QUIT;
1644 case OK: break;
1645 case FAIL_SEND: goto SEND_FAILED;
1646 case FAIL: goto RESPONSE_FAILED;
0756eb3c
PH
1647 }
1648 }
1649
1650/* The setting up of the SMTP call is now complete. Any subsequent errors are
1651message-specific. */
1652
1653setting_up = FALSE;
1654
1655/* If there is a filter command specified for this transport, we can now
1656set it up. This cannot be done until the identify of the host is known. */
1657
1658if (tblock->filter_command != NULL)
1659 {
1660 BOOL rc;
1661 uschar buffer[64];
1662 sprintf(CS buffer, "%.50s transport", tblock->name);
1663 rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command,
1664 TRUE, DEFER, addrlist, buffer, NULL);
9b989985 1665 transport_filter_timeout = tblock->filter_timeout;
0756eb3c
PH
1666
1667 /* On failure, copy the error to all addresses, abandon the SMTP call, and
1668 yield ERROR. */
1669
1670 if (!rc)
1671 {
447d236c
PH
1672 set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER,
1673 FALSE);
0756eb3c
PH
1674 yield = ERROR;
1675 goto SEND_QUIT;
1676 }
1677 }
1678
1679
1680/* For messages that have more than the maximum number of envelope recipients,
1681we want to send several transactions down the same SMTP connection. (See
1682comments in deliver.c as to how this reconciles, heuristically, with
1683remote_max_parallel.) This optimization was added to Exim after the following
1684code was already working. The simplest way to put it in without disturbing the
1685code was to use a goto to jump back to this point when there is another
1686transaction to handle. */
1687
1688SEND_MESSAGE:
1689sync_addr = first_addr;
1690address_count = 0;
1691ok = FALSE;
1692send_rset = TRUE;
1693completed_address = FALSE;
1694
1695
1696/* Initiate a message transfer. If we know the receiving MTA supports the SIZE
1697qualification, send it, adding something to the message size to allow for
1698imprecision and things that get added en route. Exim keeps the number of lines
1699in a message, so we can give an accurate value for the original message, but we
1700need some additional to handle added headers. (Double "." characters don't get
1701included in the count.) */
1702
1703p = buffer;
1704*p = 0;
1705
1706if (smtp_use_size)
1707 {
1708 sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition);
1709 while (*p) p++;
1710 }
1711
8ccd00b1 1712#ifndef DISABLE_PRDR
fd98a5c6
JH
1713prdr_active = FALSE;
1714if (prdr_offered)
1715 {
1716 for (addr = first_addr; addr; addr = addr->next)
1717 if (addr->transport_return == PENDING_DEFER)
1718 {
1719 for (addr = addr->next; addr; addr = addr->next)
1720 if (addr->transport_return == PENDING_DEFER)
1721 { /* at least two recipients to send */
1722 prdr_active = TRUE;
1723 sprintf(CS p, " PRDR"); p += 5;
1724 goto prdr_is_active;
1725 }
1726 break;
1727 }
1728 }
1729prdr_is_active:
1730#endif
1731
6c1c3d1d
WB
1732#ifdef EXPERIMENTAL_DSN
1733/* check if all addresses have lasthop flag */
1734/* do not send RET and ENVID if true */
1735dsn_all_lasthop = TRUE;
1736for (addr = first_addr;
1737 address_count < max_rcpt && addr != NULL;
1738 addr = addr->next)
1739 if ((addr->dsn_flags & rf_dsnlasthop) != 1)
1740 dsn_all_lasthop = FALSE;
1741
1742/* Add any DSN flags to the mail command */
1743
1744if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE))
1745 {
1746 if (dsn_ret == dsn_ret_hdrs)
1747 {
1748 strcpy(p, " RET=HDRS");
1749 while (*p) p++;
1750 }
1751 else if (dsn_ret == dsn_ret_full)
1752 {
1753 strcpy(p, " RET=FULL");
1754 while (*p) p++;
1755 }
1756 if (dsn_envid != NULL)
1757 {
1758 string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid);
1759 while (*p) p++;
1760 }
1761 }
1762#endif
1763
6b62e899
JH
1764/* If an authenticated_sender override has been specified for this transport
1765instance, expand it. If the expansion is forced to fail, and there was already
1766an authenticated_sender for this message, the original value will be used.
1767Other expansion failures are serious. An empty result is ignored, but there is
1768otherwise no check - this feature is expected to be used with LMTP and other
1769cases where non-standard addresses (e.g. without domains) might be required. */
1770
fcc8e047
JH
1771if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob))
1772 return ERROR;
0756eb3c
PH
1773
1774/* From here until we send the DATA command, we can make use of PIPELINING
1775if the server host supports it. The code has to be able to check the responses
1776at any point, for when the buffer fills up, so we write it totally generally.
1777When PIPELINING is off, each command written reports that it has flushed the
1778buffer. */
1779
1780pending_MAIL = TRUE; /* The block starts with MAIL */
1781
1782rc = smtp_write_command(&outblock, smtp_use_pipelining,
1783 "MAIL FROM:<%s>%s\r\n", return_path, buffer);
1784mail_command = string_copy(big_buffer); /* Save for later error message */
1785
1786switch(rc)
1787 {
1788 case -1: /* Transmission error */
1789 goto SEND_FAILED;
1790
1791 case +1: /* Block was sent */
1792 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
e97957bc
PH
1793 ob->command_timeout))
1794 {
1795 if (errno == 0 && buffer[0] == '4')
1796 {
1797 errno = ERRNO_MAIL4XX;
1798 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
1799 }
1800 goto RESPONSE_FAILED;
1801 }
0756eb3c
PH
1802 pending_MAIL = FALSE;
1803 break;
1804 }
1805
1806/* Pass over all the relevant recipient addresses for this host, which are the
1807ones that have status PENDING_DEFER. If we are using PIPELINING, we can send
1808several before we have to read the responses for those seen so far. This
1809checking is done by a subroutine because it also needs to be done at the end.
1810Send only up to max_rcpt addresses at a time, leaving first_addr pointing to
1811the next one if not all are sent.
1812
1813In the MUA wrapper situation, we want to flush the PIPELINING buffer for the
1814last address because we want to abort if any recipients have any kind of
1815problem, temporary or permanent. We know that all recipient addresses will have
1816the PENDING_DEFER status, because only one attempt is ever made, and we know
1817that max_rcpt will be large, so all addresses will be done at once. */
1818
1819for (addr = first_addr;
1820 address_count < max_rcpt && addr != NULL;
1821 addr = addr->next)
1822 {
1823 int count;
1824 BOOL no_flush;
1825
6c1c3d1d
WB
1826 #ifdef EXPERIMENTAL_DSN
1827 if(smtp_use_dsn)
1828 addr->dsn_aware = dsn_support_yes;
1829 else
1830 addr->dsn_aware = dsn_support_no;
1831 #endif
1832
0756eb3c
PH
1833 if (addr->transport_return != PENDING_DEFER) continue;
1834
1835 address_count++;
1836 no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL);
1837
6c1c3d1d
WB
1838 #ifdef EXPERIMENTAL_DSN
1839 /* Add any DSN flags to the rcpt command and add to the sent string */
1840
1841 p = buffer;
1842 *p = 0;
1843
1844 if ((smtp_use_dsn) && ((addr->dsn_flags & rf_dsnlasthop) != 1))
1845 {
1846 if ((addr->dsn_flags & rf_dsnflags) != 0)
1847 {
1848 int i;
1849 BOOL first = TRUE;
1850 strcpy(p, " NOTIFY=");
1851 while (*p) p++;
1852 for (i = 0; i < 4; i++)
1853 {
1854 if ((addr->dsn_flags & rf_list[i]) != 0)
1855 {
1856 if (!first) *p++ = ',';
1857 first = FALSE;
1858 strcpy(p, rf_names[i]);
1859 while (*p) p++;
1860 }
1861 }
1862 }
1863
1864 if (addr->dsn_orcpt != NULL) {
1865 string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s",
1866 addr->dsn_orcpt);
1867 while (*p) p++;
1868 }
1869 }
1870 #endif
1871
1872
0756eb3c
PH
1873 /* Now send the RCPT command, and process outstanding responses when
1874 necessary. After a timeout on RCPT, we just end the function, leaving the
1875 yield as OK, because this error can often mean that there is a problem with
1876 just one address, so we don't want to delay the host. */
1877
6c1c3d1d
WB
1878 #ifdef EXPERIMENTAL_DSN
1879 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n",
1880 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer);
1881 #else
f1513293
PH
1882 count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n",
1883 transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr);
6c1c3d1d
WB
1884 #endif
1885
0756eb3c
PH
1886 if (count < 0) goto SEND_FAILED;
1887 if (count > 0)
1888 {
1889 switch(sync_responses(first_addr, tblock->rcpt_include_affixes,
48c7f9e2
PH
1890 &sync_addr, host, count, ob->address_retry_include_sender,
1891 pending_MAIL, 0, &inblock, ob->command_timeout, buffer,
1892 sizeof(buffer)))
0756eb3c
PH
1893 {
1894 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1895 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1896 break;
1897
1898 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1899 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1900 case 0: /* No 2xx or 5xx, but no probs */
1901 break;
1902
1903 case -1: goto END_OFF; /* Timeout on RCPT */
1904 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */
1905 }
1906 pending_MAIL = FALSE; /* Dealt with MAIL */
1907 }
1908 } /* Loop for next address */
1909
1910/* If we are an MUA wrapper, abort if any RCPTs were rejected, either
1911permanently or temporarily. We should have flushed and synced after the last
1912RCPT. */
1913
1914if (mua_wrapper)
1915 {
1916 address_item *badaddr;
1917 for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next)
1918 {
1919 if (badaddr->transport_return != PENDING_OK) break;
1920 }
1921 if (badaddr != NULL)
1922 {
447d236c
PH
1923 set_errno(addrlist, 0, badaddr->message, FAIL,
1924 testflag(badaddr, af_pass_message));
0756eb3c
PH
1925 ok = FALSE;
1926 }
1927 }
1928
1929/* If ok is TRUE, we know we have got at least one good recipient, and must now
1930send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still
1931have a good recipient buffered up if we are pipelining. We don't want to waste
1932time sending DATA needlessly, so we only send it if either ok is TRUE or if we
1933are pipelining. The responses are all handled by sync_responses(). */
1934
1935if (ok || (smtp_use_pipelining && !mua_wrapper))
1936 {
1937 int count = smtp_write_command(&outblock, FALSE, "DATA\r\n");
1938 if (count < 0) goto SEND_FAILED;
1939 switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr,
48c7f9e2
PH
1940 host, count, ob->address_retry_include_sender, pending_MAIL,
1941 ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer)))
0756eb3c
PH
1942 {
1943 case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */
1944 case 2: completed_address = TRUE; /* 5xx (only) => progress made */
1945 break;
1946
1947 case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */
1948 if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */
1949 case 0: break; /* No 2xx or 5xx, but no probs */
1950
1951 case -1: goto END_OFF; /* Timeout on RCPT */
1952 default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */
1953 }
1954 }
1955
1956/* Save the first address of the next batch. */
1957
1958first_addr = addr;
1959
1960/* If there were no good recipients (but otherwise there have been no
1961problems), just set ok TRUE, since we have handled address-specific errors
1962already. Otherwise, it's OK to send the message. Use the check/escape mechanism
1963for handling the SMTP dot-handling protocol, flagging to apply to headers as
1964well as body. Set the appropriate timeout value to be used for each chunk.
1965(Haven't been able to make it work using select() for writing yet.) */
1966
1967if (!ok) ok = TRUE; else
1968 {
1969 sigalrm_seen = FALSE;
1970 transport_write_timeout = ob->data_timeout;
1971 smtp_command = US"sending data block"; /* For error messages */
1972 DEBUG(D_transport|D_v)
1973 debug_printf(" SMTP>> writing message and terminating \".\"\n");
1974 transport_count = 0;
80a47a2c 1975#ifndef DISABLE_DKIM
4cd12fe9
TK
1976 ok = dkim_transport_write_message(addrlist, inblock.sock,
1977 topt_use_crlf | topt_end_dot | topt_escape_headers |
1978 (tblock->body_only? topt_no_headers : 0) |
1979 (tblock->headers_only? topt_no_body : 0) |
1980 (tblock->return_path_add? topt_add_return_path : 0) |
1981 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1982 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1983 0, /* No size limit */
1984 tblock->add_headers, tblock->remove_headers,
1985 US".", US"..", /* Escaping strings */
1986 tblock->rewrite_rules, tblock->rewrite_existflags,
1987 ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector,
80a47a2c 1988 ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers
4cd12fe9
TK
1989 );
1990#else
0756eb3c
PH
1991 ok = transport_write_message(addrlist, inblock.sock,
1992 topt_use_crlf | topt_end_dot | topt_escape_headers |
1993 (tblock->body_only? topt_no_headers : 0) |
1994 (tblock->headers_only? topt_no_body : 0) |
1995 (tblock->return_path_add? topt_add_return_path : 0) |
1996 (tblock->delivery_date_add? topt_add_delivery_date : 0) |
1997 (tblock->envelope_to_add? topt_add_envelope_to : 0),
1998 0, /* No size limit */
1999 tblock->add_headers, tblock->remove_headers,
2000 US".", US"..", /* Escaping strings */
2001 tblock->rewrite_rules, tblock->rewrite_existflags);
4cd12fe9 2002#endif
0756eb3c
PH
2003
2004 /* transport_write_message() uses write() because it is called from other
2005 places to write to non-sockets. This means that under some OS (e.g. Solaris)
2006 it can exit with "Broken pipe" as its error. This really means that the
2007 socket got closed at the far end. */
2008
2009 transport_write_timeout = 0; /* for subsequent transports */
2010
2011 /* Failure can either be some kind of I/O disaster (including timeout),
2012 or the failure of a transport filter or the expansion of added headers. */
2013
2014 if (!ok)
2015 {
2016 buffer[0] = 0; /* There hasn't been a response */
2017 goto RESPONSE_FAILED;
2018 }
2019
2020 /* We used to send the terminating "." explicitly here, but because of
2021 buffering effects at both ends of TCP/IP connections, you don't gain
2022 anything by keeping it separate, so it might as well go in the final
2023 data buffer for efficiency. This is now done by setting the topt_end_dot
2024 flag above. */
2025
2026 smtp_command = US"end of data";
2027
8ccd00b1 2028#ifndef DISABLE_PRDR
fd98a5c6
JH
2029 /* For PRDR we optionally get a partial-responses warning
2030 * followed by the individual responses, before going on with
2031 * the overall response. If we don't get the warning then deal
2032 * with per non-PRDR. */
2033 if(prdr_active)
2034 {
2035 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3',
2036 ob->final_timeout);
2037 if (!ok && errno == 0)
2038 switch(buffer[0])
2039 {
2040 case '2': prdr_active = FALSE;
2041 ok = TRUE;
2042 break;
2043 case '4': errno = ERRNO_DATA4XX;
2044 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2045 break;
2046 }
2047 }
2048 else
2049#endif
2050
2051 /* For non-PRDR SMTP, we now read a single response that applies to the
2052 whole message. If it is OK, then all the addresses have been delivered. */
0756eb3c 2053
e97957bc
PH
2054 if (!lmtp)
2055 {
2056 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2057 ob->final_timeout);
2058 if (!ok && errno == 0 && buffer[0] == '4')
2059 {
2060 errno = ERRNO_DATA4XX;
2061 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2062 }
2063 }
0756eb3c
PH
2064
2065 /* For LMTP, we get back a response for every RCPT command that we sent;
2066 some may be accepted and some rejected. For those that get a response, their
2067 status is fixed; any that are accepted have been handed over, even if later
2068 responses crash - at least, that's how I read RFC 2033.
2069
2070 If all went well, mark the recipient addresses as completed, record which
2071 host/IPaddress they were delivered to, and cut out RSET when sending another
2072 message down the same channel. Write the completed addresses to the journal
2073 now so that they are recorded in case there is a crash of hardware or
2074 software before the spool gets updated. Also record the final SMTP
2075 confirmation if needed (for SMTP only). */
2076
2077 if (ok)
2078 {
2079 int flag = '=';
2080 int delivery_time = (int)(time(NULL) - start_delivery_time);
2081 int len;
2082 host_item *thost;
2083 uschar *conf = NULL;
2084 send_rset = FALSE;
2085
2086 /* Make a copy of the host if it is local to this invocation
2087 of the transport. */
2088
2089 if (copy_host)
2090 {
2091 thost = store_get(sizeof(host_item));
2092 *thost = *host;
2093 thost->name = string_copy(host->name);
2094 thost->address = string_copy(host->address);
2095 }
2096 else thost = host;
2097
2098 /* Set up confirmation if needed - applies only to SMTP */
2099
d68218c7
JH
2100 if (
2101 #ifndef EXPERIMENTAL_TPDA
2102 (log_extra_selector & LX_smtp_confirmation) != 0 &&
2103 #endif
2104 !lmtp
2105 )
0756eb3c
PH
2106 {
2107 uschar *s = string_printing(buffer);
2108 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2109 }
2110
fd98a5c6 2111 /* Process all transported addresses - for LMTP or PRDR, read a status for
0756eb3c
PH
2112 each one. */
2113
2114 for (addr = addrlist; addr != first_addr; addr = addr->next)
2115 {
2116 if (addr->transport_return != PENDING_OK) continue;
2117
2118 /* LMTP - if the response fails badly (e.g. timeout), use it for all the
2119 remaining addresses. Otherwise, it's a return code for just the one
75def545
PH
2120 address. For temporary errors, add a retry item for the address so that
2121 it doesn't get tried again too soon. */
0756eb3c 2122
8ccd00b1 2123#ifndef DISABLE_PRDR
fd98a5c6
JH
2124 if (lmtp || prdr_active)
2125#else
0756eb3c 2126 if (lmtp)
fd98a5c6 2127#endif
0756eb3c
PH
2128 {
2129 if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2130 ob->final_timeout))
2131 {
2132 if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED;
fd98a5c6 2133 addr->message = string_sprintf(
8ccd00b1 2134#ifndef DISABLE_PRDR
fd98a5c6
JH
2135 "%s error after %s: %s", prdr_active ? "PRDR":"LMTP",
2136#else
2137 "LMTP error after %s: %s",
2138#endif
0756eb3c 2139 big_buffer, string_printing(buffer));
75def545
PH
2140 setflag(addr, af_pass_message); /* Allow message to go to user */
2141 if (buffer[0] == '5')
2142 addr->transport_return = FAIL;
2143 else
2144 {
e97957bc
PH
2145 errno = ERRNO_DATA4XX;
2146 addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
75def545 2147 addr->transport_return = DEFER;
8ccd00b1 2148#ifndef DISABLE_PRDR
fd98a5c6
JH
2149 if (!prdr_active)
2150#endif
2151 retry_add_item(addr, addr->address_retry_key, 0);
75def545 2152 }
0756eb3c
PH
2153 continue;
2154 }
2155 completed_address = TRUE; /* NOW we can set this flag */
c0ea85ab
TF
2156 if ((log_extra_selector & LX_smtp_confirmation) != 0)
2157 {
2158 uschar *s = string_printing(buffer);
2159 conf = (s == buffer)? (uschar *)string_copy(s) : s;
2160 }
0756eb3c
PH
2161 }
2162
2163 /* SMTP, or success return from LMTP for this address. Pass back the
2d280592 2164 actual host that was used. */
0756eb3c
PH
2165
2166 addr->transport_return = OK;
2167 addr->more_errno = delivery_time;
0756eb3c
PH
2168 addr->host_used = thost;
2169 addr->special_action = flag;
2170 addr->message = conf;
8ccd00b1 2171#ifndef DISABLE_PRDR
fd98a5c6
JH
2172 if (prdr_active) addr->flags |= af_prdr_used;
2173#endif
0756eb3c
PH
2174 flag = '-';
2175
8ccd00b1 2176#ifndef DISABLE_PRDR
fd98a5c6
JH
2177 if (!prdr_active)
2178#endif
2179 {
2180 /* Update the journal. For homonymic addresses, use the base address plus
2181 the transport name. See lots of comments in deliver.c about the reasons
2182 for the complications when homonyms are involved. Just carry on after
2183 write error, as it may prove possible to update the spool file later. */
4d8d62b9 2184
fd98a5c6
JH
2185 if (testflag(addr, af_homonym))
2186 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2187 else
2188 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2189
fd98a5c6
JH
2190 DEBUG(D_deliver) debug_printf("journalling %s", buffer);
2191 len = Ustrlen(CS buffer);
2192 if (write(journal_fd, buffer, len) != len)
2193 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2194 "%s: %s", buffer, strerror(errno));
2195 }
0756eb3c
PH
2196 }
2197
8ccd00b1 2198#ifndef DISABLE_PRDR
fd98a5c6
JH
2199 if (prdr_active)
2200 {
2201 /* PRDR - get the final, overall response. For any non-success
2202 upgrade all the address statuses. */
2203 ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2204 ob->final_timeout);
2205 if (!ok)
2206 {
2207 if(errno == 0 && buffer[0] == '4')
2208 {
2209 errno = ERRNO_DATA4XX;
2210 addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8;
2211 }
2212 for (addr = addrlist; addr != first_addr; addr = addr->next)
2213 if (buffer[0] == '5' || addr->transport_return == OK)
2214 addr->transport_return = PENDING_OK; /* allow set_errno action */
2215 goto RESPONSE_FAILED;
2216 }
2217
2218 /* Update the journal, or setup retry. */
2219 for (addr = addrlist; addr != first_addr; addr = addr->next)
2220 if (addr->transport_return == OK)
2221 {
2222 if (testflag(addr, af_homonym))
2223 sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name);
2224 else
2225 sprintf(CS buffer, "%.500s\n", addr->unique);
4d8d62b9 2226
fd98a5c6
JH
2227 DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer);
2228 len = Ustrlen(CS buffer);
2229 if (write(journal_fd, buffer, len) != len)
2230 log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for "
2231 "%s: %s", buffer, strerror(errno));
2232 }
2233 else if (addr->transport_return == DEFER)
2234 retry_add_item(addr, addr->address_retry_key, -2);
2235 }
2236#endif
2237
0756eb3c
PH
2238 /* Ensure the journal file is pushed out to disk. */
2239
54fc8428 2240 if (EXIMfsync(journal_fd) < 0)
0756eb3c
PH
2241 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s",
2242 strerror(errno));
2243 }
2244 }
2245
2246
2247/* Handle general (not specific to one address) failures here. The value of ok
2248is used to skip over this code on the falling through case. A timeout causes a
2249deferral. Other errors may defer or fail according to the response code, and
2250may set up a special errno value, e.g. after connection chopped, which is
2251assumed if errno == 0 and there is no text in the buffer. If control reaches
2252here during the setting up phase (i.e. before MAIL FROM) then always defer, as
2253the problem is not related to this specific message. */
2254
2255if (!ok)
2256 {
2257 int code;
2258
2259 RESPONSE_FAILED:
2260 save_errno = errno;
2261 message = NULL;
2262 send_quit = check_response(host, &save_errno, addrlist->more_errno,
447d236c 2263 buffer, &code, &message, &pass_message);
0756eb3c
PH
2264 goto FAILED;
2265
2266 SEND_FAILED:
2267 save_errno = errno;
2268 code = '4';
2269 message = US string_sprintf("send() to %s [%s] failed: %s",
2270 host->name, host->address, strerror(save_errno));
2271 send_quit = FALSE;
2272 goto FAILED;
2273
2274 /* This label is jumped to directly when a TLS negotiation has failed,
2275 or was not done for a host for which it is required. Values will be set
2276 in message and save_errno, and setting_up will always be true. Treat as
2277 a temporary error. */
2278
2279 #ifdef SUPPORT_TLS
2280 TLS_FAILED:
2281 code = '4';
2282 #endif
2283
2284 /* If the failure happened while setting up the call, see if the failure was
2285 a 5xx response (this will either be on connection, or following HELO - a 5xx
2286 after EHLO causes it to try HELO). If so, fail all addresses, as this host is
2287 never going to accept them. For other errors during setting up (timeouts or
2288 whatever), defer all addresses, and yield DEFER, so that the host is not
2289 tried again for a while. */
2290
2291 FAILED:
2292 ok = FALSE; /* For when reached by GOTO */
2293
2294 if (setting_up)
2295 {
2296 if (code == '5')
2297 {
447d236c 2298 set_errno(addrlist, save_errno, message, FAIL, pass_message);
0756eb3c
PH
2299 }
2300 else
2301 {
447d236c 2302 set_errno(addrlist, save_errno, message, DEFER, pass_message);
0756eb3c
PH
2303 yield = DEFER;
2304 }
2305 }
2306
e97957bc 2307 /* We want to handle timeouts after MAIL or "." and loss of connection after
0756eb3c 2308 "." specially. They can indicate a problem with the sender address or with
e97957bc
PH
2309 the contents of the message rather than a real error on the connection. These
2310 cases are treated in the same way as a 4xx response. This next bit of code
2311 does the classification. */
0756eb3c 2312
e97957bc 2313 else
0756eb3c 2314 {
e97957bc 2315 BOOL message_error;
0756eb3c 2316
e97957bc
PH
2317 switch(save_errno)
2318 {
2319 case 0:
2320 case ERRNO_MAIL4XX:
2321 case ERRNO_DATA4XX:
2322 message_error = TRUE;
2323 break;
0756eb3c 2324
e97957bc
PH
2325 case ETIMEDOUT:
2326 message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 ||
2327 Ustrncmp(smtp_command,"end ",4) == 0;
2328 break;
2329
2330 case ERRNO_SMTPCLOSED:
2331 message_error = Ustrncmp(smtp_command,"end ",4) == 0;
2332 break;
2333
2334 default:
2335 message_error = FALSE;
2336 break;
2337 }
0756eb3c 2338
e97957bc 2339 /* Handle the cases that are treated as message errors. These are:
0756eb3c 2340
e97957bc
PH
2341 (a) negative response or timeout after MAIL
2342 (b) negative response after DATA
2343 (c) negative response or timeout or dropped connection after "."
0756eb3c 2344
e97957bc
PH
2345 It won't be a negative response or timeout after RCPT, as that is dealt
2346 with separately above. The action in all cases is to set an appropriate
2347 error code for all the addresses, but to leave yield set to OK because the
2348 host itself has not failed. Of course, it might in practice have failed
2349 when we've had a timeout, but if so, we'll discover that at the next
2350 delivery attempt. For a temporary error, set the message_defer flag, and
2351 write to the logs for information if this is not the last host. The error
2352 for the last host will be logged as part of the address's log line. */
2353
2354 if (message_error)
0756eb3c 2355 {
e97957bc
PH
2356 if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */
2357 set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER,
2358 pass_message);
2359
2360 /* If there's an errno, the message contains just the identity of
2361 the host. */
2362
2363 if (code != '5') /* Anything other than 5 is treated as temporary */
2364 {
2365 if (save_errno > 0)
2366 message = US string_sprintf("%s: %s", message, strerror(save_errno));
2367 if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message);
2368 deliver_msglog("%s %s\n", tod_stamp(tod_log), message);
2369 *message_defer = TRUE;
2370 }
2371 }
2372
2373 /* Otherwise, we have an I/O error or a timeout other than after MAIL or
2374 ".", or some other transportation error. We defer all addresses and yield
2375 DEFER, except for the case of failed add_headers expansion, or a transport
2376 filter failure, when the yield should be ERROR, to stop it trying other
2377 hosts. */
2378
2379 else
2380 {
2381 yield = (save_errno == ERRNO_CHHEADER_FAIL ||
2382 save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER;
2383 set_errno(addrlist, save_errno, message, DEFER, pass_message);
0756eb3c
PH
2384 }
2385 }
2386 }
2387
2388
2389/* If all has gone well, send_quit will be set TRUE, implying we can end the
2390SMTP session tidily. However, if there were too many addresses to send in one
2391message (indicated by first_addr being non-NULL) we want to carry on with the
2392rest of them. Also, it is desirable to send more than one message down the SMTP
2393connection if there are several waiting, provided we haven't already sent so
2394many as to hit the configured limit. The function transport_check_waiting looks
2395for a waiting message and returns its id. Then transport_pass_socket tries to
2396set up a continued delivery by passing the socket on to another process. The
2397variable send_rset is FALSE if a message has just been successfully transfered.
2398
2399If we are already sending down a continued channel, there may be further
2400addresses not yet delivered that are aimed at the same host, but which have not
2401been passed in this run of the transport. In this case, continue_more will be
2402true, and all we should do is send RSET if necessary, and return, leaving the
2403channel open.
2404
2405However, if no address was disposed of, i.e. all addresses got 4xx errors, we
2406do not want to continue with other messages down the same channel, because that
2407can lead to looping between two or more messages, all with the same,
2408temporarily failing address(es). [The retry information isn't updated yet, so
2409new processes keep on trying.] We probably also don't want to try more of this
2410message's addresses either.
2411
2412If we have started a TLS session, we have to end it before passing the
2413connection to a new process. However, not all servers can handle this (Exim
2414can), so we do not pass such a connection on if the host matches
2415hosts_nopass_tls. */
2416
2417DEBUG(D_transport)
2418 debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d "
2419 "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset,
2420 continue_more, yield, (first_addr == NULL)? "":"not ");
2421
2422if (completed_address && ok && send_quit)
2423 {
2424 BOOL more;
2425 if (first_addr != NULL || continue_more ||
2426 (
817d9f57 2427 (tls_out.active < 0 ||
0756eb3c
PH
2428 verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name,
2429 host->address, NULL) != OK)
2430 &&
2431 transport_check_waiting(tblock->name, host->name,
2432 tblock->connection_max_messages, new_message_id, &more)
2433 ))
2434 {
2435 uschar *msg;
447d236c 2436 BOOL pass_message;
0756eb3c
PH
2437
2438 if (send_rset)
2439 {
2440 if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0))
2441 {
2442 msg = US string_sprintf("send() to %s [%s] failed: %s", host->name,
2443 host->address, strerror(save_errno));
2444 send_quit = FALSE;
2445 }
2446 else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2447 ob->command_timeout)))
2448 {
2449 int code;
447d236c
PH
2450 send_quit = check_response(host, &errno, 0, buffer, &code, &msg,
2451 &pass_message);
0756eb3c
PH
2452 if (!send_quit)
2453 {
2454 DEBUG(D_transport) debug_printf("%s\n", msg);
2455 }
2456 }
2457 }
2458
2459 /* Either RSET was not needed, or it succeeded */
2460
2461 if (ok)
2462 {
2463 if (first_addr != NULL) /* More addresses still to be sent */
2464 { /* in this run of the transport */
2465 continue_sequence++; /* Causes * in logging */
2466 goto SEND_MESSAGE;
2467 }
2468 if (continue_more) return yield; /* More addresses for another run */
2469
2470 /* Pass the socket to a new Exim process. Before doing so, we must shut
2471 down TLS. Not all MTAs allow for the continuation of the SMTP session
2472 when TLS is shut down. We test for this by sending a new EHLO. If we
2473 don't get a good response, we don't attempt to pass the socket on. */
2474
2475 #ifdef SUPPORT_TLS
817d9f57 2476 if (tls_out.active >= 0)
0756eb3c 2477 {
817d9f57 2478 tls_close(FALSE, TRUE);
061b7ebd
PP
2479 if (smtps)
2480 ok = FALSE;
2481 else
2482 ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 &&
2483 smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2484 ob->command_timeout);
0756eb3c
PH
2485 }
2486 #endif
2487
2488 /* If the socket is successfully passed, we musn't send QUIT (or
2489 indeed anything!) from here. */
2490
2491 if (ok && transport_pass_socket(tblock->name, host->name, host->address,
2492 new_message_id, inblock.sock))
2493 {
2494 send_quit = FALSE;
2495 }
2496 }
2497
2498 /* If RSET failed and there are addresses left, they get deferred. */
2499
447d236c 2500 else set_errno(first_addr, errno, msg, DEFER, FALSE);
0756eb3c
PH
2501 }
2502 }
2503
2504/* End off tidily with QUIT unless the connection has died or the socket has
2505been passed to another process. There has been discussion on the net about what
2506to do after sending QUIT. The wording of the RFC suggests that it is necessary
2507to wait for a response, but on the other hand, there isn't anything one can do
2508with an error response, other than log it. Exim used to do that. However,
2509further discussion suggested that it is positively advantageous not to wait for
2510the response, but to close the session immediately. This is supposed to move
2511the TCP/IP TIME_WAIT state from the server to the client, thereby removing some
2512load from the server. (Hosts that are both servers and clients may not see much
2513difference, of course.) Further discussion indicated that this was safe to do
2514on Unix systems which have decent implementations of TCP/IP that leave the
2515connection around for a while (TIME_WAIT) after the application has gone away.
2516This enables the response sent by the server to be properly ACKed rather than
2517timed out, as can happen on broken TCP/IP implementations on other OS.
2518
2519This change is being made on 31-Jul-98. After over a year of trouble-free
2520operation, the old commented-out code was removed on 17-Sep-99. */
2521
2522SEND_QUIT:
2523if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2524
2525END_OFF:
2526
2527#ifdef SUPPORT_TLS
817d9f57 2528tls_close(FALSE, TRUE);
0756eb3c
PH
2529#endif
2530
2531/* Close the socket, and return the appropriate value, first setting
0756eb3c
PH
2532works because the NULL setting is passed back to the calling process, and
2533remote_max_parallel is forced to 1 when delivering over an existing connection,
2534
2535If all went well and continue_more is set, we shouldn't actually get here if
2536there are further addresses, as the return above will be taken. However,
2537writing RSET might have failed, or there may be other addresses whose hosts are
2538specified in the transports, and therefore not visible at top level, in which
2539case continue_more won't get set. */
2540
f1e894f3 2541(void)close(inblock.sock);
0756eb3c
PH
2542continue_transport = NULL;
2543continue_hostname = NULL;
2544return yield;
2545}
2546
2547
2548
2549
2550/*************************************************
2551* Closedown entry point *
2552*************************************************/
2553
2554/* This function is called when exim is passed an open smtp channel
2555from another incarnation, but the message which it has been asked
2556to deliver no longer exists. The channel is on stdin.
2557
2558We might do fancy things like looking for another message to send down
2559the channel, but if the one we sought has gone, it has probably been
2560delivered by some other process that itself will seek further messages,
2561so just close down our connection.
2562
2563Argument: pointer to the transport instance block
2564Returns: nothing
2565*/
2566
2567void
2568smtp_transport_closedown(transport_instance *tblock)
2569{
2570smtp_transport_options_block *ob =
2571 (smtp_transport_options_block *)(tblock->options_block);
2572smtp_inblock inblock;
2573smtp_outblock outblock;
2574uschar buffer[256];
2575uschar inbuffer[4096];
2576uschar outbuffer[16];
2577
2578inblock.sock = fileno(stdin);
2579inblock.buffer = inbuffer;
2580inblock.buffersize = sizeof(inbuffer);
2581inblock.ptr = inbuffer;
2582inblock.ptrend = inbuffer;
2583
2584outblock.sock = inblock.sock;
2585outblock.buffersize = sizeof(outbuffer);
2586outblock.buffer = outbuffer;
2587outblock.ptr = outbuffer;
2588outblock.cmd_count = 0;
2589outblock.authenticating = FALSE;
2590
2591(void)smtp_write_command(&outblock, FALSE, "QUIT\r\n");
2592(void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2',
2593 ob->command_timeout);
f1e894f3 2594(void)close(inblock.sock);
0756eb3c
PH
2595}
2596
2597
2598
2599/*************************************************
2600* Prepare addresses for delivery *
2601*************************************************/
2602
2603/* This function is called to flush out error settings from previous delivery
2604attempts to other hosts. It also records whether we got here via an MX record
2605or not in the more_errno field of the address. We are interested only in
2606addresses that are still marked DEFER - others may have got delivered to a
2607previously considered IP address. Set their status to PENDING_DEFER to indicate
2608which ones are relevant this time.
2609
2610Arguments:
2611 addrlist the list of addresses
2612 host the host we are delivering to
2613
2614Returns: the first address for this delivery
2615*/
2616
2617static address_item *
2618prepare_addresses(address_item *addrlist, host_item *host)
2619{
2620address_item *first_addr = NULL;
2621address_item *addr;
2622for (addr = addrlist; addr != NULL; addr = addr->next)
2623 {
2624 if (addr->transport_return != DEFER) continue;
2625 if (first_addr == NULL) first_addr = addr;
2626 addr->transport_return = PENDING_DEFER;
2627 addr->basic_errno = 0;
2628 addr->more_errno = (host->mx >= 0)? 'M' : 'A';
2629 addr->message = NULL;
2630 #ifdef SUPPORT_TLS
2631 addr->cipher = NULL;
9d1c15ef
JH
2632 addr->ourcert = NULL;
2633 addr->peercert = NULL;
0756eb3c 2634 addr->peerdn = NULL;
018058b2 2635 addr->ocsp = OCSP_NOT_REQ;
0756eb3c
PH
2636 #endif
2637 }
2638return first_addr;
2639}
2640
2641
2642
2643/*************************************************
2644* Main entry point *
2645*************************************************/
2646
2647/* See local README for interface details. As this is a remote transport, it is
2648given a chain of addresses to be delivered in one connection, if possible. It
2649always returns TRUE, indicating that each address has its own independent
2650status set, except if there is a setting up problem, in which case it returns
2651FALSE. */
2652
2653BOOL
2654smtp_transport_entry(
2655 transport_instance *tblock, /* data for this instantiation */
2656 address_item *addrlist) /* addresses we are working on */
2657{
2658int cutoff_retry;
2659int port;
2660int hosts_defer = 0;
2661int hosts_fail = 0;
2662int hosts_looked_up = 0;
2663int hosts_retry = 0;
2664int hosts_serial = 0;
2665int hosts_total = 0;
8e669ac1 2666int total_hosts_tried = 0;
0756eb3c
PH
2667address_item *addr;
2668BOOL expired = TRUE;
2669BOOL continuing = continue_hostname != NULL;
2670uschar *expanded_hosts = NULL;
2671uschar *pistring;
2672uschar *tid = string_sprintf("%s transport", tblock->name);
2673smtp_transport_options_block *ob =
2674 (smtp_transport_options_block *)(tblock->options_block);
2675host_item *hostlist = addrlist->host_list;
2676host_item *host = NULL;
2677
2678DEBUG(D_transport)
2679 {
2680 debug_printf("%s transport entered\n", tblock->name);
2681 for (addr = addrlist; addr != NULL; addr = addr->next)
2682 debug_printf(" %s\n", addr->address);
2683 if (continuing) debug_printf("already connected to %s [%s]\n",
2684 continue_hostname, continue_host_address);
2685 }
2686
f6c332bd
PH
2687/* Set the flag requesting that these hosts be added to the waiting
2688database if the delivery fails temporarily or if we are running with
2689queue_smtp or a 2-stage queue run. This gets unset for certain
2690kinds of error, typically those that are specific to the message. */
2691
2692update_waiting = TRUE;
2693
0756eb3c
PH
2694/* If a host list is not defined for the addresses - they must all have the
2695same one in order to be passed to a single transport - or if the transport has
2696a host list with hosts_override set, use the host list supplied with the
2697transport. It is an error for this not to exist. */
2698
2699if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL))
2700 {
2701 if (ob->hosts == NULL)
2702 {
2703 addrlist->message = string_sprintf("%s transport called with no hosts set",
2704 tblock->name);
2705 addrlist->transport_return = PANIC;
2706 return FALSE; /* Only top address has status */
2707 }
2708
2709 DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n",
2710 ob->hosts);
2711
2712 /* If the transport's host list contains no '$' characters, and we are not
2713 randomizing, it is fixed and therefore a chain of hosts can be built once
2714 and for all, and remembered for subsequent use by other calls to this
2715 transport. If, on the other hand, the host list does contain '$', or we are
2716 randomizing its order, we have to rebuild it each time. In the fixed case,
2717 as the hosts string will never be used again, it doesn't matter that we
2718 replace all the : characters with zeros. */
2719
2720 if (ob->hostlist == NULL)
2721 {
2722 uschar *s = ob->hosts;
2723
2724 if (Ustrchr(s, '$') != NULL)
2725 {
2726 expanded_hosts = expand_string(s);
2727 if (expanded_hosts == NULL)
2728 {
2729 addrlist->message = string_sprintf("failed to expand list of hosts "
2730 "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message);
2731 addrlist->transport_return = search_find_defer? DEFER : PANIC;
2732 return FALSE; /* Only top address has status */
2733 }
2734 DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to "
2735 "\"%s\"\n", s, expanded_hosts);
2736 s = expanded_hosts;
2737 }
2738 else
2739 if (ob->hosts_randomize) s = expanded_hosts = string_copy(s);
2740
2741 host_build_hostlist(&hostlist, s, ob->hosts_randomize);
2742
e276e04b
TF
2743 /* Check that the expansion yielded something useful. */
2744 if (hostlist == NULL)
2745 {
2746 addrlist->message =
2747 string_sprintf("%s transport has empty hosts setting", tblock->name);
2748 addrlist->transport_return = PANIC;
2749 return FALSE; /* Only top address has status */
2750 }
2751
0756eb3c
PH
2752 /* If there was no expansion of hosts, save the host list for
2753 next time. */
2754
2755 if (expanded_hosts == NULL) ob->hostlist = hostlist;
2756 }
2757
2758 /* This is not the first time this transport has been run in this delivery;
2759 the host list was built previously. */
2760
2761 else hostlist = ob->hostlist;
2762 }
2763
2764/* The host list was supplied with the address. If hosts_randomize is set, we
2765must sort it into a random order if it did not come from MX records and has not
2766already been randomized (but don't bother if continuing down an existing
2767connection). */
2768
2769else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing)
2770 {
2771 host_item *newlist = NULL;
2772 while (hostlist != NULL)
2773 {
2774 host_item *h = hostlist;
2775 hostlist = hostlist->next;
2776
2777 h->sort_key = random_number(100);
2778
2779 if (newlist == NULL)
2780 {
2781 h->next = NULL;
2782 newlist = h;
2783 }
2784 else if (h->sort_key < newlist->sort_key)
2785 {
2786 h->next = newlist;
2787 newlist = h;
2788 }
2789 else
2790 {
2791 host_item *hh = newlist;
2792 while (hh->next != NULL)
2793 {
2794 if (h->sort_key < hh->next->sort_key) break;
2795 hh = hh->next;
2796 }
2797 h->next = hh->next;
2798 hh->next = h;
2799 }
2800 }
2801
2802 hostlist = addrlist->host_list = newlist;
2803 }
2804
2805
2d280592 2806/* Sort out the default port. */
0756eb3c
PH
2807
2808if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE;
0756eb3c
PH
2809
2810
2811/* For each host-plus-IP-address on the list:
2812
2813. If this is a continued delivery and the host isn't the one with the
2814 current connection, skip.
2815
2816. If the status is unusable (i.e. previously failed or retry checked), skip.
2817
2818. If no IP address set, get the address, either by turning the name into
2819 an address, calling gethostbyname if gethostbyname is on, or by calling
2820 the DNS. The DNS may yield multiple addresses, in which case insert the
2821 extra ones into the list.
2822
2823. Get the retry data if not previously obtained for this address and set the
2824 field which remembers the state of this address. Skip if the retry time is
2825 not reached. If not, remember whether retry data was found. The retry string
2826 contains both the name and the IP address.
2827
2828. Scan the list of addresses and mark those whose status is DEFER as
2829 PENDING_DEFER. These are the only ones that will be processed in this cycle
2830 of the hosts loop.
2831
2832. Make a delivery attempt - addresses marked PENDING_DEFER will be tried.
2833 Some addresses may be successfully delivered, others may fail, and yet
2834 others may get temporary errors and so get marked DEFER.
2835
2836. The return from the delivery attempt is OK if a connection was made and a
2837 valid SMTP dialogue was completed. Otherwise it is DEFER.
2838
2839. If OK, add a "remove" retry item for this host/IPaddress, if any.
2840
2841. If fail to connect, or other defer state, add a retry item.
2842
2843. If there are any addresses whose status is still DEFER, carry on to the
2844 next host/IPaddress, unless we have tried the number of hosts given
533244af 2845 by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that
8e669ac1
PH
2846 there is some fancy logic for hosts_max_try that means its limit can be
2847 overstepped in some circumstances.
0756eb3c
PH
2848
2849If we get to the end of the list, all hosts have deferred at least one address,
2850or not reached their retry times. If delay_after_cutoff is unset, it requests a
2851delivery attempt to those hosts whose last try was before the arrival time of
2852the current message. To cope with this, we have to go round the loop a second
2853time. After that, set the status and error data for any addresses that haven't
2854had it set already. */
2855
2856for (cutoff_retry = 0; expired &&
2857 cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2);
2858 cutoff_retry++)
2859 {
2860 host_item *nexthost = NULL;
2861 int unexpired_hosts_tried = 0;
2862
2863 for (host = hostlist;
8e669ac1 2864 host != NULL &&
533244af
PH
2865 unexpired_hosts_tried < ob->hosts_max_try &&
2866 total_hosts_tried < ob->hosts_max_try_hardlimit;
0756eb3c
PH
2867 host = nexthost)
2868 {
2869 int rc;
2870 int host_af;
2871 uschar *rs;
2872 BOOL serialized = FALSE;
2873 BOOL host_is_expired = FALSE;
2874 BOOL message_defer = FALSE;
2875 BOOL ifchanges = FALSE;
2876 BOOL some_deferred = FALSE;
2877 address_item *first_addr = NULL;
2878 uschar *interface = NULL;
2879 uschar *retry_host_key = NULL;
2880 uschar *retry_message_key = NULL;
2881 uschar *serialize_key = NULL;
2882
9c4e8f60
PH
2883 /* Default next host is next host. :-) But this can vary if the
2884 hosts_max_try limit is hit (see below). It may also be reset if a host
2885 address is looked up here (in case the host was multihomed). */
2886
2887 nexthost = host->next;
2888
0756eb3c
PH
2889 /* If the address hasn't yet been obtained from the host name, look it up
2890 now, unless the host is already marked as unusable. If it is marked as
2891 unusable, it means that the router was unable to find its IP address (in
2892 the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and
2893 the lookup failed last time. We don't get this far if *all* MX records
2894 point to non-existent hosts; that is treated as a hard error.
2895
2896 We can just skip this host entirely. When the hosts came from the router,
2897 the address will timeout based on the other host(s); when the address is
2898 looked up below, there is an explicit retry record added.
2899
2900 Note that we mustn't skip unusable hosts if the address is not unset; they
2901 may be needed as expired hosts on the 2nd time round the cutoff loop. */
2902
2903 if (host->address == NULL)
2904 {
322050c2 2905 int new_port, flags;
7cd1141b 2906 host_item *hh;
0756eb3c
PH
2907 uschar *canonical_name;
2908
2909 if (host->status >= hstatus_unusable)
2910 {
2911 DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n",
2912 host->name);
2913 continue;
2914 }
2915
2916 DEBUG(D_transport) debug_printf("getting address for %s\n", host->name);
2917
7cd1141b
PH
2918 /* The host name is permitted to have an attached port. Find it, and
2919 strip it from the name. Just remember it for now. */
2920
2921 new_port = host_item_get_port(host);
2922
2923 /* Count hosts looked up */
2924
0756eb3c
PH
2925 hosts_looked_up++;
2926
2927 /* Find by name if so configured, or if it's an IP address. We don't
2928 just copy the IP address, because we need the test-for-local to happen. */
2929
322050c2
PH
2930 flags = HOST_FIND_BY_A;
2931 if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE;
2932 if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
2933
7e66e54d 2934 if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0)
322050c2 2935 rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE);
0756eb3c 2936 else
0756eb3c 2937 rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL,
578897ea 2938 ob->dnssec_request_domains, ob->dnssec_require_domains,
0756eb3c 2939 &canonical_name, NULL);
0756eb3c 2940
7cd1141b
PH
2941 /* Update the host (and any additional blocks, resulting from
2942 multihoming) with a host-specific port, if any. */
2943
2944 for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port;
2945
0756eb3c
PH
2946 /* Failure to find the host at this time (usually DNS temporary failure)
2947 is really a kind of routing failure rather than a transport failure.
2948 Therefore we add a retry item of the routing kind, not to stop us trying
2949 to look this name up here again, but to ensure the address gets timed
2950 out if the failures go on long enough. A complete failure at this point
2951 commonly points to a configuration error, but the best action is still
2952 to carry on for the next host. */
2953
2954 if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED)
2955 {
2956 retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0);
2957 expired = FALSE;
2958 if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++;
2959 DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)?
2960 "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name);
2961 host->status = hstatus_unusable;
2962
2963 for (addr = addrlist; addr != NULL; addr = addr->next)
2964 {
2965 if (addr->transport_return != DEFER) continue;
2966 addr->basic_errno = ERRNO_UNKNOWNHOST;
2967 addr->message =
2968 string_sprintf("failed to lookup IP address for %s", host->name);
2969 }
2970 continue;
2971 }
2972
2973 /* If the host is actually the local host, we may have a problem, or
2974 there may be some cunning configuration going on. In the problem case,
2975 log things and give up. The default transport status is already DEFER. */
2976
2977 if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost)
2978 {
2979 for (addr = addrlist; addr != NULL; addr = addr->next)
2980 {
2981 addr->basic_errno = 0;
2982 addr->message = string_sprintf("%s transport found host %s to be "
2983 "local", tblock->name, host->name);
2984 }
2985 goto END_TRANSPORT;
2986 }
2987 } /* End of block for IP address lookup */
2988
2989 /* If this is a continued delivery, we are interested only in the host
2990 which matches the name of the existing open channel. The check is put
2991 here after the local host lookup, in case the name gets expanded as a
2992 result of the lookup. Set expired FALSE, to save the outer loop executing
2993 twice. */
2994
2995 if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 ||
2996 Ustrcmp(continue_host_address, host->address) != 0))
2997 {
2998 expired = FALSE;
2999 continue; /* With next host */
3000 }
3001
9c4e8f60
PH
3002 /* Reset the default next host in case a multihomed host whose addresses
3003 are not looked up till just above added to the host list. */
83364d30
PH
3004
3005 nexthost = host->next;
3006
0756eb3c
PH
3007 /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the
3008 domain is in queue_smtp_domains, we don't actually want to attempt any
3009 deliveries. When doing a queue run, queue_smtp_domains is always unset. If
3010 there is a lookup defer in queue_smtp_domains, proceed as if the domain
3011 were not in it. We don't want to hold up all SMTP deliveries! Except when
3012 doing a two-stage queue run, don't do this if forcing. */
3013
3014 if ((!deliver_force || queue_2stage) && (queue_smtp ||
cf39cf57
PH
3015 match_isinlist(addrlist->domain, &queue_smtp_domains, 0,
3016 &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK))
0756eb3c
PH
3017 {
3018 expired = FALSE;
3019 for (addr = addrlist; addr != NULL; addr = addr->next)
3020 {
3021 if (addr->transport_return != DEFER) continue;
3022 addr->message = US"domain matches queue_smtp_domains, or -odqs set";
3023 }
3024 continue; /* With next host */
3025 }
3026
3027 /* Count hosts being considered - purely for an intelligent comment
3028 if none are usable. */
3029
3030 hosts_total++;
3031
3032 /* Set $host and $host address now in case they are needed for the
3033 interface expansion or the serialize_hosts check; they remain set if an
3034 actual delivery happens. */
3035
3036 deliver_host = host->name;
3037 deliver_host_address = host->address;
783b385f
JH
3038 lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes"
3039 : host->dnssec == DS_NO ? US"no"
3040 : US"";
0756eb3c 3041
7cd1141b
PH
3042 /* Set up a string for adding to the retry key if the port number is not
3043 the standard SMTP port. A host may have its own port setting that overrides
3044 the default. */
3045
3046 pistring = string_sprintf(":%d", (host->port == PORT_NONE)?
3047 port : host->port);
3048 if (Ustrcmp(pistring, ":25") == 0) pistring = US"";
3049
0756eb3c
PH
3050 /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface
3051 string changes upon expansion, we must add it to the key that is used for
3052 retries, because connections to the same host from a different interface
3053 should be treated separately. */
3054
3055 host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6;
3056 if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges,
3057 &interface, tid))
3058 return FALSE;
3059 if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface);
3060
3061 /* The first time round the outer loop, check the status of the host by
3062 inspecting the retry data. The second time round, we are interested only
3063 in expired hosts that haven't been tried since this message arrived. */
3064
3065 if (cutoff_retry == 0)
3066 {
3067 /* Ensure the status of the address is set by checking retry data if
3068 necessary. There maybe host-specific retry data (applicable to all
3069 messages) and also data for retries of a specific message at this host.
3070 If either of these retry records are actually read, the keys used are
3071 returned to save recomputing them later. */
3072
3073 host_is_expired = retry_check_address(addrlist->domain, host, pistring,
3074 ob->retry_include_ip_address, &retry_host_key, &retry_message_key);
3075
3076 DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name,
3077 (host->address == NULL)? US"" : host->address, pistring,
3078 (host->status == hstatus_usable)? "usable" :
3079 (host->status == hstatus_unusable)? "unusable" :
3080 (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?");
3081
3082 /* Skip this address if not usable at this time, noting if it wasn't
3083 actually expired, both locally and in the address. */
3084
3085 switch (host->status)
3086 {
3087 case hstatus_unusable:
3088 expired = FALSE;
3089 setflag(addrlist, af_retry_skipped);
3090 /* Fall through */
3091
3092 case hstatus_unusable_expired:
3093 switch (host->why)
3094 {
3095 case hwhy_retry: hosts_retry++; break;
3096 case hwhy_failed: hosts_fail++; break;
3097 case hwhy_deferred: hosts_defer++; break;
3098 }
3099
3100 /* If there was a retry message key, implying that previously there
3101 was a message-specific defer, we don't want to update the list of
f6c332bd 3102 messages waiting for these hosts. */
0756eb3c 3103
f6c332bd 3104 if (retry_message_key != NULL) update_waiting = FALSE;
0756eb3c
PH
3105 continue; /* With the next host or IP address */
3106 }
3107 }
3108
3109 /* Second time round the loop: if the address is set but expired, and
3110 the message is newer than the last try, let it through. */
3111
3112 else
3113 {
3114 if (host->address == NULL ||
3115 host->status != hstatus_unusable_expired ||
3116 host->last_try > received_time)
3117 continue;
3118 DEBUG(D_transport)
3119 debug_printf("trying expired host %s [%s]%s\n",
3120 host->name, host->address, pistring);
3121 host_is_expired = TRUE;
3122 }
3123
3124 /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired;
3125 it remains TRUE only if all hosts are expired and none are actually tried.
3126 */
3127
3128 expired = FALSE;
3129
3130 /* If this host is listed as one to which access must be serialized,
3131 see if another Exim process has a connection to it, and if so, skip
3132 this host. If not, update the database to record our connection to it
3133 and remember this for later deletion. Do not do any of this if we are
3134 sending the message down a pre-existing connection. */
3135
3136 if (!continuing &&
3137 verify_check_this_host(&(ob->serialize_hosts), NULL, host->name,
3138 host->address, NULL) == OK)
3139 {
3140 serialize_key = string_sprintf("host-serialize-%s", host->name);
3141 if (!enq_start(serialize_key))
3142 {
3143 DEBUG(D_transport)
3144 debug_printf("skipping host %s because another Exim process "
3145 "is connected to it\n", host->name);
3146 hosts_serial++;
3147 continue;
3148 }
3149 serialized = TRUE;
3150 }
3151
3152 /* OK, we have an IP address that is not waiting for its retry time to
3153 arrive (it might be expired) OR (second time round the loop) we have an
3154 expired host that hasn't been tried since the message arrived. Have a go
3155 at delivering the message to it. First prepare the addresses by flushing
3156 out the result of previous attempts, and finding the first address that
3157 is still to be delivered. */
3158
3159 first_addr = prepare_addresses(addrlist, host);
3160
3161 DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n",
3162 message_id, host->name, host->address, addrlist->address,
3163 (addrlist->next == NULL)? "" : ", ...");
3164
3165 set_process_info("delivering %s to %s [%s] (%s%s)",
3166 message_id, host->name, host->address, addrlist->address,
3167 (addrlist->next == NULL)? "" : ", ...");
3168
3169 /* This is not for real; don't do the delivery. If there are
3170 any remaining hosts, list them. */
3171
3172 if (dont_deliver)
3173 {
3174 host_item *host2;
447d236c 3175 set_errno(addrlist, 0, NULL, OK, FALSE);
0756eb3c
PH
3176 for (addr = addrlist; addr != NULL; addr = addr->next)
3177 {
3178 addr->host_used = host;
3179 addr->special_action = '*';
3180 addr->message = US"delivery bypassed by -N option";
3181 }
3182 DEBUG(D_transport)
3183 {
3184 debug_printf("*** delivery by %s transport bypassed by -N option\n"
3185 "*** host and remaining hosts:\n", tblock->name);
3186 for (host2 = host; host2 != NULL; host2 = host2->next)
3187 debug_printf(" %s [%s]\n", host2->name,
3188 (host2->address == NULL)? US"unset" : host2->address);
3189 }
3190 rc = OK;
3191 }
3192
3193 /* This is for real. If the host is expired, we don't count it for
3194 hosts_max_retry. This ensures that all hosts must expire before an address
8e669ac1 3195 is timed out, unless hosts_max_try_hardlimit (which protects against
533244af 3196 lunatic DNS configurations) is reached.
8e669ac1 3197
533244af
PH
3198 If the host is not expired and we are about to hit the hosts_max_retry
3199 limit, check to see if there is a subsequent hosts with a different MX
3200 value. If so, make that the next host, and don't count this one. This is a
3201 heuristic to make sure that different MXs do get tried. With a normal kind
3202 of retry rule, they would get tried anyway when the earlier hosts were
3203 delayed, but if the domain has a "retry every time" type of rule - as is
3204 often used for the the very large ISPs, that won't happen. */
0756eb3c
PH
3205
3206 else
3207 {
3208 if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try)
3209 {
3210 host_item *h;
3211 DEBUG(D_transport)
3212 debug_printf("hosts_max_try limit reached with this host\n");
3213 for (h = host; h != NULL; h = h->next)
3214 if (h->mx != host->mx) break;
3215 if (h != NULL)
3216 {
3217 nexthost = h;
3218 unexpired_hosts_tried--;
3219 DEBUG(D_transport) debug_printf("however, a higher MX host exists "
3220 "and will be tried\n");
3221 }
3222 }
3223
3224 /* Attempt the delivery. */
3225
533244af 3226 total_hosts_tried++;
0756eb3c
PH
3227 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3228 expanded_hosts != NULL, &message_defer, FALSE);
3229
3230 /* Yield is one of:
3231 OK => connection made, each address contains its result;
3232 message_defer is set for message-specific defers (when all
3233 recipients are marked defer)
3234 DEFER => there was a non-message-specific delivery problem;
3235 ERROR => there was a problem setting up the arguments for a filter,
3236 or there was a problem with expanding added headers
3237 */
3238
3239 /* If the result is not OK, there was a non-message-specific problem.
3240 If the result is DEFER, we need to write to the logs saying what happened
3241 for this particular host, except in the case of authentication and TLS
3242 failures, where the log has already been written. If all hosts defer a
3243 general message is written at the end. */
3244
3245 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL &&
3246 first_addr->basic_errno != ERRNO_TLSFAILURE)
3247 write_logs(first_addr, host);
3248
d68218c7
JH
3249 #ifdef EXPERIMENTAL_TPDA
3250 if (rc == DEFER)
3251 tpda_deferred(ob, first_addr, host);
3252 #endif
3253
0756eb3c
PH
3254 /* If STARTTLS was accepted, but there was a failure in setting up the
3255 TLS session (usually a certificate screwup), and the host is not in
3256 hosts_require_tls, and tls_tempfail_tryclear is true, try again, with
3257 TLS forcibly turned off. We have to start from scratch with a new SMTP
3258 connection. That's why the retry is done from here, not from within
3259 smtp_deliver(). [Rejections of STARTTLS itself don't screw up the
3260 session, so the in-clear transmission after those errors, if permitted,
3261 happens inside smtp_deliver().] */
3262
3263 #ifdef SUPPORT_TLS
3264 if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE &&
3265 ob->tls_tempfail_tryclear &&
3266 verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name,
3267 host->address, NULL) != OK)
3268 {
3269 log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted "
3270 "to %s [%s] (not in hosts_require_tls)", host->name, host->address);
3271 first_addr = prepare_addresses(addrlist, host);
3272 rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock,
3273 expanded_hosts != NULL, &message_defer, TRUE);
3274 if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL)
3275 write_logs(first_addr, host);
d68218c7
JH
3276 #ifdef EXPERIMENTAL_TPDA
3277 if (rc == DEFER)
3278 tpda_deferred(ob, first_addr, host);
3279 #endif
0756eb3c
PH
3280 }
3281 #endif
3282 }
3283
3284 /* Delivery attempt finished */
3285
3286 rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)?
3287 US"ERROR" : US"?";
3288
3289 set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s",
3290 message_id, host->name, host->address, addrlist->address,
3291 (addrlist->next == NULL)? "" : " (& others)", rs);
3292
3293 /* Release serialization if set up */
3294
3295 if (serialized) enq_end(serialize_key);
3296
3297 /* If the result is DEFER, or if a host retry record is known to exist, we
3298 need to add an item to the retry chain for updating the retry database
3299 at the end of delivery. We only need to add the item to the top address,
3300 of course. Also, if DEFER, we mark the IP address unusable so as to skip it
3301 for any other delivery attempts using the same address. (It is copied into
3302 the unusable tree at the outer level, so even if different address blocks
3303 contain the same address, it still won't get tried again.) */
3304
3305 if (rc == DEFER || retry_host_key != NULL)
3306 {
3307 int delete_flag = (rc != DEFER)? rf_delete : 0;
3308 if (retry_host_key == NULL)
3309 {
3310 retry_host_key = ob->retry_include_ip_address?
3311 string_sprintf("T:%S:%s%s", host->name, host->address, pistring) :
3312 string_sprintf("T:%S%s", host->name, pistring);
3313 }
3314
3315 /* If a delivery of another message over an existing SMTP connection
3316 yields DEFER, we do NOT set up retry data for the host. This covers the
3317 case when there are delays in routing the addresses in the second message
3318 that are so long that the server times out. This is alleviated by not
3319 routing addresses that previously had routing defers when handling an
3320 existing connection, but even so, this case may occur (e.g. if a
3321 previously happily routed address starts giving routing defers). If the
3322 host is genuinely down, another non-continued message delivery will
3323 notice it soon enough. */
3324
3325 if (delete_flag != 0 || !continuing)
3326 retry_add_item(first_addr, retry_host_key, rf_host | delete_flag);
3327
3328 /* We may have tried an expired host, if its retry time has come; ensure
3329 the status reflects the expiry for the benefit of any other addresses. */
3330
3331 if (rc == DEFER)
3332 {
3333 host->status = (host_is_expired)?
3334 hstatus_unusable_expired : hstatus_unusable;
3335 host->why = hwhy_deferred;
3336 }
3337 }
3338
3339 /* If message_defer is set (host was OK, but every recipient got deferred
3340 because of some message-specific problem), or if that had happened
3341 previously so that a message retry key exists, add an appropriate item
3342 to the retry chain. Note that if there was a message defer but now there is
3343 a host defer, the message defer record gets deleted. That seems perfectly
3344 reasonable. Also, stop the message from being remembered as waiting
f6c332bd 3345 for specific hosts. */
0756eb3c
PH
3346
3347 if (message_defer || retry_message_key != NULL)
3348 {
3349 int delete_flag = message_defer? 0 : rf_delete;
3350 if (retry_message_key == NULL)
3351 {
3352 retry_message_key = ob->retry_include_ip_address?
3353 string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring,
3354 message_id) :
3355 string_sprintf("T:%S%s:%s", host->name, pistring, message_id);
3356 }
3357 retry_add_item(addrlist, retry_message_key,
3358 rf_message | rf_host | delete_flag);
f6c332bd 3359 update_waiting = FALSE;
0756eb3c
PH
3360 }
3361
3362 /* Any return other than DEFER (that is, OK or ERROR) means that the
3363 addresses have got their final statuses filled in for this host. In the OK
3364 case, see if any of them are deferred. */
3365
3366 if (rc == OK)
3367 {
3368 for (addr = addrlist; addr != NULL; addr = addr->next)
3369 {
3370 if (addr->transport_return == DEFER)
3371 {
3372 some_deferred = TRUE;
3373 break;
3374 }
3375 }
3376 }
3377
3378 /* If no addresses deferred or the result was ERROR, return. We do this for
3379 ERROR because a failing filter set-up or add_headers expansion is likely to
3380 fail for any host we try. */
3381
3382 if (rc == ERROR || (rc == OK && !some_deferred))
3383 {
3384 DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3385 return TRUE; /* Each address has its status */
3386 }
3387
3388 /* If the result was DEFER or some individual addresses deferred, let
3389 the loop run to try other hosts with the deferred addresses, except for the
3390 case when we were trying to deliver down an existing channel and failed.
3391 Don't try any other hosts in this case. */
3392
3393 if (continuing) break;
3394
3395 /* If the whole delivery, or some individual addresses, were deferred and
3396 there are more hosts that could be tried, do not count this host towards
3397 the hosts_max_try limit if the age of the message is greater than the
3398 maximum retry time for this host. This means we may try try all hosts,
3399 ignoring the limit, when messages have been around for some time. This is
3400 important because if we don't try all hosts, the address will never time
533244af 3401 out. NOTE: this does not apply to hosts_max_try_hardlimit. */
0756eb3c
PH
3402
3403 if ((rc == DEFER || some_deferred) && nexthost != NULL)
3404 {
3405 BOOL timedout;
3406 retry_config *retry = retry_find_config(host->name, NULL, 0, 0);
3407
3408 if (retry != NULL && retry->rules != NULL)
3409 {
3410 retry_rule *last_rule;
3411 for (last_rule = retry->rules;
3412 last_rule->next != NULL;
3413 last_rule = last_rule->next);
3414 timedout = time(NULL) - received_time > last_rule->timeout;
3415 }
3416 else timedout = TRUE; /* No rule => timed out */
3417
3418 if (timedout)
3419 {
3420 unexpired_hosts_tried--;
3421 DEBUG(D_transport) debug_printf("temporary delivery error(s) override "
3422 "hosts_max_try (message older than host's retry time)\n");
3423 }
3424 }
3425 } /* End of loop for trying multiple hosts. */
3426
3427 /* This is the end of the loop that repeats iff expired is TRUE and
3428 ob->delay_after_cutoff is FALSE. The second time round we will
3429 try those hosts that haven't been tried since the message arrived. */
3430
3431 DEBUG(D_transport)
3432 {
3433 debug_printf("all IP addresses skipped or deferred at least one address\n");
3434 if (expired && !ob->delay_after_cutoff && cutoff_retry == 0)
3435 debug_printf("retrying IP addresses not tried since message arrived\n");
3436 }
3437 }
3438
3439
3440/* Get here if all IP addresses are skipped or defer at least one address. In
3441MUA wrapper mode, this will happen only for connection or other non-message-
3442specific failures. Force the delivery status for all addresses to FAIL. */
3443
3444if (mua_wrapper)
3445 {
3446 for (addr = addrlist; addr != NULL; addr = addr->next)
3447 addr->transport_return = FAIL;
3448 goto END_TRANSPORT;
3449 }
3450
3451/* In the normal, non-wrapper case, add a standard message to each deferred
3452address if there hasn't been an error, that is, if it hasn't actually been
3453tried this time. The variable "expired" will be FALSE if any deliveries were
3454actually tried, or if there was at least one host that was not expired. That
3455is, it is TRUE only if no deliveries were tried and all hosts were expired. If
3456a delivery has been tried, an error code will be set, and the failing of the
3457message is handled by the retry code later.
3458
3459If queue_smtp is set, or this transport was called to send a subsequent message
3460down an existing TCP/IP connection, and something caused the host not to be
3461found, we end up here, but can detect these cases and handle them specially. */
3462
3463for (addr = addrlist; addr != NULL; addr = addr->next)
3464 {
3465 /* If host is not NULL, it means that we stopped processing the host list
533244af
PH
3466 because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this
3467 means we need to behave as if some hosts were skipped because their retry
3468 time had not come. Specifically, this prevents the address from timing out.
8e669ac1 3469 However, if we have hit hosts_max_try_hardlimit, we want to behave as if all
533244af 3470 hosts were tried. */
0756eb3c
PH
3471
3472 if (host != NULL)
3473 {
533244af
PH
3474 if (total_hosts_tried >= ob->hosts_max_try_hardlimit)
3475 {
3476 DEBUG(D_transport)
3477 debug_printf("hosts_max_try_hardlimit reached: behave as if all "
3478 "hosts were tried\n");
3479 }
3480 else
8e669ac1 3481 {
533244af
PH
3482 DEBUG(D_transport)
3483 debug_printf("hosts_max_try limit caused some hosts to be skipped\n");
3484 setflag(addr, af_retry_skipped);
8e669ac1 3485 }
0756eb3c
PH
3486 }
3487
3488 if (queue_smtp) /* no deliveries attempted */
3489 {
3490 addr->transport_return = DEFER;
3491 addr->basic_errno = 0;
3492 addr->message = US"SMTP delivery explicitly queued";
3493 }
3494
3495 else if (addr->transport_return == DEFER &&
3496 (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) &&
3497 addr->message == NULL)
3498 {
3499 addr->basic_errno = ERRNO_HRETRY;
3500 if (continue_hostname != NULL)
3501 {
3502 addr->message = US"no host found for existing SMTP connection";
3503 }
3504 else if (expired)
3505 {
fffffe4c 3506 setflag(addr, af_pass_message); /* This is not a security risk */
0756eb3c
PH
3507 addr->message = (ob->delay_after_cutoff)?
3508 US"retry time not reached for any host after a long failure period" :
3509 US"all hosts have been failing for a long time and were last tried "
3510 "after this message arrived";
3511
3512 /* If we are already using fallback hosts, or there are no fallback hosts
3513 defined, convert the result to FAIL to cause a bounce. */
3514
3515 if (addr->host_list == addr->fallback_hosts ||
3516 addr->fallback_hosts == NULL)
3517 addr->transport_return = FAIL;
3518 }
3519 else
3520 {
3521 if (hosts_retry == hosts_total)
3522 addr->message = US"retry time not reached for any host";
3523 else if (hosts_fail == hosts_total)
3524 addr->message = US"all host address lookups failed permanently";
3525 else if (hosts_defer == hosts_total)
3526 addr->message = US"all host address lookups failed temporarily";
3527 else if (hosts_serial == hosts_total)
3528 addr->message = US"connection limit reached for all hosts";
3529 else if (hosts_fail+hosts_defer == hosts_total)
3530 addr->message = US"all host address lookups failed";
3531 else addr->message = US"some host address lookups failed and retry time "
3532 "not reached for other hosts or connection limit reached";
3533 }
3534 }
3535 }
3536
3537/* Update the database which keeps information about which messages are waiting
f6c332bd
PH
3538for which hosts to become available. For some message-specific errors, the
3539update_waiting flag is turned off because we don't want follow-on deliveries in
ea722490 3540those cases. If this transport instance is explicitly limited to one message
8b260705
PP
3541per connection then follow-on deliveries are not possible and there's no need
3542to create/update the per-transport wait-<transport_name> database. */
0756eb3c 3543
ea722490
JH
3544if (update_waiting && tblock->connection_max_messages != 1)
3545 transport_update_waiting(hostlist, tblock->name);
0756eb3c
PH
3546
3547END_TRANSPORT:
3548
3549DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name);
3550
3551return TRUE; /* Each address has its status */
3552}
3553
578897ea
JH
3554/* vi: aw ai sw=2
3555*/
0756eb3c 3556/* End of transport/smtp.c */