Commit | Line | Data |
---|---|---|
0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5a66c31b | 5 | /* Copyright (c) University of Cambridge 1995 - 2014 */ |
0756eb3c PH |
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 | |
17 | over TCP/IP. The options must be in alphabetic order (note that "_" comes | |
18 | before the lower case letters). Some live in the transport_instance block so as | |
19 | to be publicly visible; these are flagged with opt_public. */ | |
20 | ||
21 | optionlist smtp_transport_options[] = { | |
506900af JH |
22 | { "*expand_multi_domain", opt_stringptr | opt_hidden | opt_public, |
23 | (void *)offsetof(transport_instance, expand_multi_domain) }, | |
9c695f6d JH |
24 | { "*expand_retry_include_ip_address", opt_stringptr | opt_hidden, |
25 | (void *)(offsetof(smtp_transport_options_block, expand_retry_include_ip_address)) }, | |
26 | ||
48c7f9e2 PH |
27 | { "address_retry_include_sender", opt_bool, |
28 | (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) }, | |
0756eb3c PH |
29 | { "allow_localhost", opt_bool, |
30 | (void *)offsetof(smtp_transport_options_block, allow_localhost) }, | |
31 | { "authenticated_sender", opt_stringptr, | |
32 | (void *)offsetof(smtp_transport_options_block, authenticated_sender) }, | |
382afc6b PH |
33 | { "authenticated_sender_force", opt_bool, |
34 | (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) }, | |
0756eb3c PH |
35 | { "command_timeout", opt_time, |
36 | (void *)offsetof(smtp_transport_options_block, command_timeout) }, | |
37 | { "connect_timeout", opt_time, | |
38 | (void *)offsetof(smtp_transport_options_block, connect_timeout) }, | |
39 | { "connection_max_messages", opt_int | opt_public, | |
40 | (void *)offsetof(transport_instance, connection_max_messages) }, | |
41 | { "data_timeout", opt_time, | |
42 | (void *)offsetof(smtp_transport_options_block, data_timeout) }, | |
43 | { "delay_after_cutoff", opt_bool, | |
44 | (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) }, | |
80a47a2c | 45 | #ifndef DISABLE_DKIM |
f7572e5a TK |
46 | { "dkim_canon", opt_stringptr, |
47 | (void *)offsetof(smtp_transport_options_block, dkim_canon) }, | |
48 | { "dkim_domain", opt_stringptr, | |
49 | (void *)offsetof(smtp_transport_options_block, dkim_domain) }, | |
50 | { "dkim_private_key", opt_stringptr, | |
51 | (void *)offsetof(smtp_transport_options_block, dkim_private_key) }, | |
52 | { "dkim_selector", opt_stringptr, | |
53 | (void *)offsetof(smtp_transport_options_block, dkim_selector) }, | |
54 | { "dkim_sign_headers", opt_stringptr, | |
55 | (void *)offsetof(smtp_transport_options_block, dkim_sign_headers) }, | |
56 | { "dkim_strict", opt_stringptr, | |
57 | (void *)offsetof(smtp_transport_options_block, dkim_strict) }, | |
80a47a2c | 58 | #endif |
0756eb3c PH |
59 | { "dns_qualify_single", opt_bool, |
60 | (void *)offsetof(smtp_transport_options_block, dns_qualify_single) }, | |
61 | { "dns_search_parents", opt_bool, | |
62 | (void *)offsetof(smtp_transport_options_block, dns_search_parents) }, | |
578897ea JH |
63 | { "dnssec_request_domains", opt_stringptr, |
64 | (void *)offsetof(smtp_transport_options_block, dnssec_request_domains) }, | |
65 | { "dnssec_require_domains", opt_stringptr, | |
66 | (void *)offsetof(smtp_transport_options_block, dnssec_require_domains) }, | |
9e4f5962 PP |
67 | { "dscp", opt_stringptr, |
68 | (void *)offsetof(smtp_transport_options_block, dscp) }, | |
0756eb3c PH |
69 | { "fallback_hosts", opt_stringptr, |
70 | (void *)offsetof(smtp_transport_options_block, fallback_hosts) }, | |
71 | { "final_timeout", opt_time, | |
72 | (void *)offsetof(smtp_transport_options_block, final_timeout) }, | |
73 | { "gethostbyname", opt_bool, | |
74 | (void *)offsetof(smtp_transport_options_block, gethostbyname) }, | |
80a47a2c | 75 | #ifdef SUPPORT_TLS |
b1770b6e | 76 | /* These are no longer honoured, as of Exim 4.80; for now, we silently |
2d571266 | 77 | ignore; 4.83 will warn, and a later-still release will remove |
17c76198 | 78 | these options, so that using them becomes an error. */ |
83da1223 PH |
79 | { "gnutls_require_kx", opt_stringptr, |
80 | (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) }, | |
81 | { "gnutls_require_mac", opt_stringptr, | |
82 | (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) }, | |
83 | { "gnutls_require_protocols", opt_stringptr, | |
84 | (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) }, | |
80a47a2c | 85 | #endif |
0756eb3c PH |
86 | { "helo_data", opt_stringptr, |
87 | (void *)offsetof(smtp_transport_options_block, helo_data) }, | |
88 | { "hosts", opt_stringptr, | |
89 | (void *)offsetof(smtp_transport_options_block, hosts) }, | |
90 | { "hosts_avoid_esmtp", opt_stringptr, | |
91 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) }, | |
c51b8e75 PH |
92 | { "hosts_avoid_pipelining", opt_stringptr, |
93 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_pipelining) }, | |
80a47a2c | 94 | #ifdef SUPPORT_TLS |
0756eb3c PH |
95 | { "hosts_avoid_tls", opt_stringptr, |
96 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) }, | |
80a47a2c | 97 | #endif |
0756eb3c PH |
98 | { "hosts_max_try", opt_int, |
99 | (void *)offsetof(smtp_transport_options_block, hosts_max_try) }, | |
533244af PH |
100 | { "hosts_max_try_hardlimit", opt_int, |
101 | (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) }, | |
80a47a2c | 102 | #ifdef SUPPORT_TLS |
0756eb3c PH |
103 | { "hosts_nopass_tls", opt_stringptr, |
104 | (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) }, | |
80a47a2c | 105 | #endif |
0756eb3c PH |
106 | { "hosts_override", opt_bool, |
107 | (void *)offsetof(smtp_transport_options_block, hosts_override) }, | |
108 | { "hosts_randomize", opt_bool, | |
109 | (void *)offsetof(smtp_transport_options_block, hosts_randomize) }, | |
f2de3a33 | 110 | #if defined(SUPPORT_TLS) && !defined(DISABLE_OCSP) |
44662487 JH |
111 | { "hosts_request_ocsp", opt_stringptr, |
112 | (void *)offsetof(smtp_transport_options_block, hosts_request_ocsp) }, | |
113 | #endif | |
0756eb3c PH |
114 | { "hosts_require_auth", opt_stringptr, |
115 | (void *)offsetof(smtp_transport_options_block, hosts_require_auth) }, | |
80a47a2c | 116 | #ifdef SUPPORT_TLS |
7a31d643 JH |
117 | # ifdef EXPERIMENTAL_DANE |
118 | { "hosts_require_dane", opt_stringptr, | |
119 | (void *)offsetof(smtp_transport_options_block, hosts_require_dane) }, | |
120 | # endif | |
f2de3a33 | 121 | # ifndef DISABLE_OCSP |
f5d78688 JH |
122 | { "hosts_require_ocsp", opt_stringptr, |
123 | (void *)offsetof(smtp_transport_options_block, hosts_require_ocsp) }, | |
124 | # endif | |
0756eb3c PH |
125 | { "hosts_require_tls", opt_stringptr, |
126 | (void *)offsetof(smtp_transport_options_block, hosts_require_tls) }, | |
80a47a2c | 127 | #endif |
0756eb3c PH |
128 | { "hosts_try_auth", opt_stringptr, |
129 | (void *)offsetof(smtp_transport_options_block, hosts_try_auth) }, | |
7a31d643 | 130 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
96e47838 TL |
131 | { "hosts_try_dane", opt_stringptr, |
132 | (void *)offsetof(smtp_transport_options_block, hosts_try_dane) }, | |
133 | #endif | |
8ccd00b1 | 134 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
135 | { "hosts_try_prdr", opt_stringptr, |
136 | (void *)offsetof(smtp_transport_options_block, hosts_try_prdr) }, | |
137 | #endif | |
99400968 JH |
138 | #ifdef SUPPORT_TLS |
139 | { "hosts_verify_avoid_tls", opt_stringptr, | |
140 | (void *)offsetof(smtp_transport_options_block, hosts_verify_avoid_tls) }, | |
141 | #endif | |
0756eb3c PH |
142 | { "interface", opt_stringptr, |
143 | (void *)offsetof(smtp_transport_options_block, interface) }, | |
144 | { "keepalive", opt_bool, | |
145 | (void *)offsetof(smtp_transport_options_block, keepalive) }, | |
f1513293 PH |
146 | { "lmtp_ignore_quota", opt_bool, |
147 | (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) }, | |
0756eb3c PH |
148 | { "max_rcpt", opt_int | opt_public, |
149 | (void *)offsetof(transport_instance, max_addresses) }, | |
506900af | 150 | { "multi_domain", opt_expand_bool | opt_public, |
0756eb3c PH |
151 | (void *)offsetof(transport_instance, multi_domain) }, |
152 | { "port", opt_stringptr, | |
153 | (void *)offsetof(smtp_transport_options_block, port) }, | |
154 | { "protocol", opt_stringptr, | |
155 | (void *)offsetof(smtp_transport_options_block, protocol) }, | |
9c695f6d | 156 | { "retry_include_ip_address", opt_expand_bool, |
0756eb3c PH |
157 | (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) }, |
158 | { "serialize_hosts", opt_stringptr, | |
159 | (void *)offsetof(smtp_transport_options_block, serialize_hosts) }, | |
160 | { "size_addition", opt_int, | |
161 | (void *)offsetof(smtp_transport_options_block, size_addition) } | |
80a47a2c | 162 | #ifdef SUPPORT_TLS |
0756eb3c PH |
163 | ,{ "tls_certificate", opt_stringptr, |
164 | (void *)offsetof(smtp_transport_options_block, tls_certificate) }, | |
165 | { "tls_crl", opt_stringptr, | |
166 | (void *)offsetof(smtp_transport_options_block, tls_crl) }, | |
54c90be1 PP |
167 | { "tls_dh_min_bits", opt_int, |
168 | (void *)offsetof(smtp_transport_options_block, tls_dh_min_bits) }, | |
0756eb3c PH |
169 | { "tls_privatekey", opt_stringptr, |
170 | (void *)offsetof(smtp_transport_options_block, tls_privatekey) }, | |
3f0945ff | 171 | { "tls_require_ciphers", opt_stringptr, |
0756eb3c | 172 | (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) }, |
3f0945ff PP |
173 | { "tls_sni", opt_stringptr, |
174 | (void *)offsetof(smtp_transport_options_block, tls_sni) }, | |
0756eb3c PH |
175 | { "tls_tempfail_tryclear", opt_bool, |
176 | (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) }, | |
a63be306 WB |
177 | { "tls_try_verify_hosts", opt_stringptr, |
178 | (void *)offsetof(smtp_transport_options_block, tls_try_verify_hosts) }, | |
e51c7be2 JH |
179 | #ifdef EXPERIMENTAL_CERTNAMES |
180 | { "tls_verify_cert_hostnames", opt_stringptr, | |
181 | (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)}, | |
182 | #endif | |
0756eb3c | 183 | { "tls_verify_certificates", opt_stringptr, |
a63be306 WB |
184 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }, |
185 | { "tls_verify_hosts", opt_stringptr, | |
186 | (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) } | |
80a47a2c | 187 | #endif |
0756eb3c PH |
188 | }; |
189 | ||
190 | /* Size of the options list. An extern variable has to be used so that its | |
191 | address can appear in the tables drtables.c. */ | |
192 | ||
193 | int smtp_transport_options_count = | |
194 | sizeof(smtp_transport_options)/sizeof(optionlist); | |
195 | ||
196 | /* Default private options block for the smtp transport. */ | |
197 | ||
198 | smtp_transport_options_block smtp_transport_option_defaults = { | |
199 | NULL, /* hosts */ | |
200 | NULL, /* fallback_hosts */ | |
201 | NULL, /* hostlist */ | |
202 | NULL, /* fallback_hostlist */ | |
203 | NULL, /* authenticated_sender */ | |
204 | US"$primary_hostname", /* helo_data */ | |
205 | NULL, /* interface */ | |
206 | NULL, /* port */ | |
207 | US"smtp", /* protocol */ | |
9e4f5962 | 208 | NULL, /* DSCP */ |
0756eb3c PH |
209 | NULL, /* serialize_hosts */ |
210 | NULL, /* hosts_try_auth */ | |
211 | NULL, /* hosts_require_auth */ | |
96e47838 TL |
212 | #ifdef EXPERIMENTAL_DANE |
213 | NULL, /* hosts_try_dane */ | |
7a31d643 | 214 | NULL, /* hosts_require_dane */ |
96e47838 | 215 | #endif |
8ccd00b1 | 216 | #ifndef DISABLE_PRDR |
ad07e9ad | 217 | US"*", /* hosts_try_prdr */ |
f5d78688 | 218 | #endif |
f2de3a33 | 219 | #ifndef DISABLE_OCSP |
0e66b3b6 | 220 | US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */ |
f5d78688 | 221 | NULL, /* hosts_require_ocsp */ |
fd98a5c6 | 222 | #endif |
0756eb3c PH |
223 | NULL, /* hosts_require_tls */ |
224 | NULL, /* hosts_avoid_tls */ | |
99400968 | 225 | US"*", /* hosts_verify_avoid_tls */ |
c51b8e75 | 226 | NULL, /* hosts_avoid_pipelining */ |
0756eb3c PH |
227 | NULL, /* hosts_avoid_esmtp */ |
228 | NULL, /* hosts_nopass_tls */ | |
229 | 5*60, /* command_timeout */ | |
230 | 5*60, /* connect_timeout; shorter system default overrides */ | |
231 | 5*60, /* data timeout */ | |
232 | 10*60, /* final timeout */ | |
233 | 1024, /* size_addition */ | |
234 | 5, /* hosts_max_try */ | |
8e669ac1 | 235 | 50, /* hosts_max_try_hardlimit */ |
48c7f9e2 | 236 | TRUE, /* address_retry_include_sender */ |
0756eb3c | 237 | FALSE, /* allow_localhost */ |
382afc6b | 238 | FALSE, /* authenticated_sender_force */ |
0756eb3c PH |
239 | FALSE, /* gethostbyname */ |
240 | TRUE, /* dns_qualify_single */ | |
241 | FALSE, /* dns_search_parents */ | |
578897ea JH |
242 | NULL, /* dnssec_request_domains */ |
243 | NULL, /* dnssec_require_domains */ | |
0756eb3c PH |
244 | TRUE, /* delay_after_cutoff */ |
245 | FALSE, /* hosts_override */ | |
246 | FALSE, /* hosts_randomize */ | |
247 | TRUE, /* keepalive */ | |
f1513293 | 248 | FALSE, /* lmtp_ignore_quota */ |
9c695f6d | 249 | NULL, /* expand_retry_include_ip_address */ |
0756eb3c | 250 | TRUE /* retry_include_ip_address */ |
80a47a2c | 251 | #ifdef SUPPORT_TLS |
0756eb3c PH |
252 | ,NULL, /* tls_certificate */ |
253 | NULL, /* tls_crl */ | |
254 | NULL, /* tls_privatekey */ | |
255 | NULL, /* tls_require_ciphers */ | |
83da1223 PH |
256 | NULL, /* gnutls_require_kx */ |
257 | NULL, /* gnutls_require_mac */ | |
258 | NULL, /* gnutls_require_proto */ | |
54c90be1 | 259 | NULL, /* tls_sni */ |
0756eb3c | 260 | NULL, /* tls_verify_certificates */ |
54c90be1 PP |
261 | EXIM_CLIENT_DH_DEFAULT_MIN_BITS, |
262 | /* tls_dh_min_bits */ | |
a63be306 WB |
263 | TRUE, /* tls_tempfail_tryclear */ |
264 | NULL, /* tls_verify_hosts */ | |
265 | NULL /* tls_try_verify_hosts */ | |
e51c7be2 JH |
266 | # ifdef EXPERIMENTAL_CERTNAMES |
267 | ,NULL /* tls_verify_cert_hostnames */ | |
268 | # endif | |
80a47a2c TK |
269 | #endif |
270 | #ifndef DISABLE_DKIM | |
f7572e5a TK |
271 | ,NULL, /* dkim_canon */ |
272 | NULL, /* dkim_domain */ | |
273 | NULL, /* dkim_private_key */ | |
274 | NULL, /* dkim_selector */ | |
275 | NULL, /* dkim_sign_headers */ | |
276 | NULL /* dkim_strict */ | |
80a47a2c | 277 | #endif |
0756eb3c PH |
278 | }; |
279 | ||
6c1c3d1d WB |
280 | #ifdef EXPERIMENTAL_DSN |
281 | /* some DSN flags for use later */ | |
282 | ||
283 | static int rf_list[] = {rf_notify_never, rf_notify_success, | |
284 | rf_notify_failure, rf_notify_delay }; | |
285 | ||
45500060 | 286 | static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" }; |
6c1c3d1d WB |
287 | #endif |
288 | ||
289 | ||
0756eb3c PH |
290 | |
291 | /* Local statics */ | |
292 | ||
293 | static uschar *smtp_command; /* Points to last cmd for error messages */ | |
294 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ | |
f6c332bd | 295 | static BOOL update_waiting; /* TRUE to update the "wait" database */ |
0756eb3c PH |
296 | |
297 | ||
298 | /************************************************* | |
299 | * Setup entry point * | |
300 | *************************************************/ | |
301 | ||
302 | /* This function is called when the transport is about to be used, | |
303 | but before running it in a sub-process. It is used for two things: | |
304 | ||
305 | (1) To set the fallback host list in addresses, when delivering. | |
26da7e20 PH |
306 | (2) To pass back the interface, port, protocol, and other options, for use |
307 | during callout verification. | |
0756eb3c PH |
308 | |
309 | Arguments: | |
310 | tblock pointer to the transport instance block | |
311 | addrlist list of addresses about to be transported | |
312 | tf if not NULL, pointer to block in which to return options | |
929ba01c PH |
313 | uid the uid that will be set (not used) |
314 | gid the gid that will be set (not used) | |
0756eb3c PH |
315 | errmsg place for error message (not used) |
316 | ||
317 | Returns: OK always (FAIL, DEFER not used) | |
318 | */ | |
319 | ||
320 | static int | |
321 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, | |
929ba01c | 322 | transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg) |
0756eb3c PH |
323 | { |
324 | smtp_transport_options_block *ob = | |
325 | (smtp_transport_options_block *)(tblock->options_block); | |
326 | ||
327 | errmsg = errmsg; /* Keep picky compilers happy */ | |
929ba01c PH |
328 | uid = uid; |
329 | gid = gid; | |
0756eb3c PH |
330 | |
331 | /* Pass back options if required. This interface is getting very messy. */ | |
332 | ||
333 | if (tf != NULL) | |
334 | { | |
335 | tf->interface = ob->interface; | |
336 | tf->port = ob->port; | |
337 | tf->protocol = ob->protocol; | |
338 | tf->hosts = ob->hosts; | |
339 | tf->hosts_override = ob->hosts_override; | |
340 | tf->hosts_randomize = ob->hosts_randomize; | |
341 | tf->gethostbyname = ob->gethostbyname; | |
342 | tf->qualify_single = ob->dns_qualify_single; | |
343 | tf->search_parents = ob->dns_search_parents; | |
26da7e20 | 344 | tf->helo_data = ob->helo_data; |
0756eb3c PH |
345 | } |
346 | ||
347 | /* Set the fallback host list for all the addresses that don't have fallback | |
348 | host lists, provided that the local host wasn't present in the original host | |
349 | list. */ | |
350 | ||
351 | if (!testflag(addrlist, af_local_host_removed)) | |
352 | { | |
353 | for (; addrlist != NULL; addrlist = addrlist->next) | |
354 | if (addrlist->fallback_hosts == NULL) | |
355 | addrlist->fallback_hosts = ob->fallback_hostlist; | |
356 | } | |
357 | ||
358 | return OK; | |
359 | } | |
360 | ||
361 | ||
362 | ||
363 | /************************************************* | |
364 | * Initialization entry point * | |
365 | *************************************************/ | |
366 | ||
367 | /* Called for each instance, after its options have been read, to | |
368 | enable consistency checks to be done, or anything else that needs | |
369 | to be set up. | |
370 | ||
371 | Argument: pointer to the transport instance block | |
372 | Returns: nothing | |
373 | */ | |
374 | ||
375 | void | |
376 | smtp_transport_init(transport_instance *tblock) | |
377 | { | |
378 | smtp_transport_options_block *ob = | |
379 | (smtp_transport_options_block *)(tblock->options_block); | |
380 | ||
381 | /* Retry_use_local_part defaults FALSE if unset */ | |
382 | ||
383 | if (tblock->retry_use_local_part == TRUE_UNSET) | |
384 | tblock->retry_use_local_part = FALSE; | |
385 | ||
386 | /* Set the default port according to the protocol */ | |
387 | ||
388 | if (ob->port == NULL) | |
061b7ebd PP |
389 | ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : |
390 | (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp"; | |
0756eb3c PH |
391 | |
392 | /* Set up the setup entry point, to be called before subprocesses for this | |
393 | transport. */ | |
394 | ||
395 | tblock->setup = smtp_transport_setup; | |
396 | ||
397 | /* Complain if any of the timeouts are zero. */ | |
398 | ||
399 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || | |
400 | ob->final_timeout <= 0) | |
401 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
402 | "command, data, or final timeout value is zero for %s transport", | |
403 | tblock->name); | |
404 | ||
405 | /* If hosts_override is set and there are local hosts, set the global | |
406 | flag that stops verify from showing router hosts. */ | |
407 | ||
408 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; | |
409 | ||
410 | /* If there are any fallback hosts listed, build a chain of host items | |
411 | for them, but do not do any lookups at this time. */ | |
412 | ||
413 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); | |
2d571266 | 414 | |
32d07012 | 415 | #ifdef SUPPORT_TLS |
2d571266 JH |
416 | if ( ob->gnutls_require_kx |
417 | || ob->gnutls_require_mac | |
418 | || ob->gnutls_require_proto) | |
419 | log_write(0, LOG_MAIN, "WARNING: smtp transport options" | |
420 | " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols" | |
421 | " are obsolete\n"); | |
32d07012 | 422 | #endif |
0756eb3c PH |
423 | } |
424 | ||
425 | ||
426 | ||
427 | ||
428 | ||
429 | /************************************************* | |
430 | * Set delivery info into all active addresses * | |
431 | *************************************************/ | |
432 | ||
433 | /* Only addresses whose status is >= PENDING are relevant. A lesser | |
434 | status means that an address is not currently being processed. | |
435 | ||
436 | Arguments: | |
447d236c PH |
437 | addrlist points to a chain of addresses |
438 | errno_value to put in each address's errno field | |
439 | msg to put in each address's message field | |
440 | rc to put in each address's transport_return field | |
441 | pass_message if TRUE, set the "pass message" flag in the address | |
c562fd30 | 442 | host if set, mark addrs as having used this host |
0756eb3c PH |
443 | |
444 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in | |
445 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate | |
446 | this particular type of timeout. | |
447 | ||
448 | Returns: nothing | |
449 | */ | |
450 | ||
7cd1141b PH |
451 | static void |
452 | set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc, | |
c562fd30 | 453 | BOOL pass_message, host_item * host) |
0756eb3c PH |
454 | { |
455 | address_item *addr; | |
456 | int orvalue = 0; | |
457 | if (errno_value == ERRNO_CONNECTTIMEOUT) | |
458 | { | |
459 | errno_value = ETIMEDOUT; | |
460 | orvalue = RTEF_CTOUT; | |
461 | } | |
462 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
463 | { | |
464 | if (addr->transport_return < PENDING) continue; | |
465 | addr->basic_errno = errno_value; | |
466 | addr->more_errno |= orvalue; | |
447d236c PH |
467 | if (msg != NULL) |
468 | { | |
469 | addr->message = msg; | |
470 | if (pass_message) setflag(addr, af_pass_message); | |
471 | } | |
0756eb3c | 472 | addr->transport_return = rc; |
c562fd30 JH |
473 | if (host) |
474 | addr->host_used = host; | |
0756eb3c PH |
475 | } |
476 | } | |
477 | ||
478 | ||
479 | ||
480 | /************************************************* | |
481 | * Check an SMTP response * | |
482 | *************************************************/ | |
483 | ||
484 | /* This function is given an errno code and the SMTP response buffer | |
485 | to analyse, together with the host identification for generating messages. It | |
486 | sets an appropriate message and puts the first digit of the response code into | |
487 | the yield variable. If no response was actually read, a suitable digit is | |
488 | chosen. | |
489 | ||
490 | Arguments: | |
447d236c PH |
491 | host the current host, to get its name for messages |
492 | errno_value pointer to the errno value | |
493 | more_errno from the top address for use with ERRNO_FILTER_FAIL | |
494 | buffer the SMTP response buffer | |
495 | yield where to put a one-digit SMTP response code | |
496 | message where to put an errror message | |
497 | pass_message set TRUE if message is an SMTP response | |
498 | ||
499 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE | |
0756eb3c PH |
500 | */ |
501 | ||
a7538db1 JH |
502 | static BOOL |
503 | check_response(host_item *host, int *errno_value, int more_errno, | |
447d236c | 504 | uschar *buffer, int *yield, uschar **message, BOOL *pass_message) |
0756eb3c PH |
505 | { |
506 | uschar *pl = US""; | |
507 | ||
508 | if (smtp_use_pipelining && | |
509 | (Ustrcmp(smtp_command, "MAIL") == 0 || | |
510 | Ustrcmp(smtp_command, "RCPT") == 0 || | |
511 | Ustrcmp(smtp_command, "DATA") == 0)) | |
512 | pl = US"pipelined "; | |
513 | ||
514 | *yield = '4'; /* Default setting is to give a temporary error */ | |
515 | ||
516 | /* Handle response timeout */ | |
517 | ||
518 | if (*errno_value == ETIMEDOUT) | |
519 | { | |
c562fd30 JH |
520 | *message = US string_sprintf("SMTP timeout after %s%s", |
521 | pl, smtp_command); | |
0756eb3c PH |
522 | if (transport_count > 0) |
523 | *message = US string_sprintf("%s (%d bytes written)", *message, | |
524 | transport_count); | |
525 | return FALSE; | |
526 | } | |
527 | ||
528 | /* Handle malformed SMTP response */ | |
529 | ||
530 | if (*errno_value == ERRNO_SMTPFORMAT) | |
531 | { | |
532 | uschar *malfresp = string_printing(buffer); | |
533 | while (isspace(*malfresp)) malfresp++; | |
c562fd30 JH |
534 | *message = *malfresp == 0 |
535 | ? string_sprintf("Malformed SMTP reply (an empty line) " | |
536 | "in response to %s%s", pl, smtp_command) | |
537 | : string_sprintf("Malformed SMTP reply in response to %s%s: %s", | |
538 | pl, smtp_command, malfresp); | |
0756eb3c PH |
539 | return FALSE; |
540 | } | |
541 | ||
542 | /* Handle a failed filter process error; can't send QUIT as we mustn't | |
543 | end the DATA. */ | |
544 | ||
545 | if (*errno_value == ERRNO_FILTER_FAIL) | |
546 | { | |
35af9f61 | 547 | *message = US string_sprintf("transport filter process failed (%d)%s", |
8e669ac1 | 548 | more_errno, |
35af9f61 | 549 | (more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); |
0756eb3c PH |
550 | return FALSE; |
551 | } | |
552 | ||
553 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't | |
554 | end the DATA. */ | |
555 | ||
556 | if (*errno_value == ERRNO_CHHEADER_FAIL) | |
557 | { | |
558 | *message = | |
559 | US string_sprintf("failed to expand headers_add or headers_remove: %s", | |
560 | expand_string_message); | |
561 | return FALSE; | |
562 | } | |
563 | ||
564 | /* Handle failure to write a complete data block */ | |
565 | ||
566 | if (*errno_value == ERRNO_WRITEINCOMPLETE) | |
567 | { | |
568 | *message = US string_sprintf("failed to write a data block"); | |
569 | return FALSE; | |
570 | } | |
571 | ||
572 | /* Handle error responses from the remote mailer. */ | |
573 | ||
574 | if (buffer[0] != 0) | |
575 | { | |
576 | uschar *s = string_printing(buffer); | |
447d236c | 577 | *message = US string_sprintf("SMTP error from remote mail server after %s%s: " |
c562fd30 | 578 | "%s", pl, smtp_command, s); |
447d236c | 579 | *pass_message = TRUE; |
0756eb3c PH |
580 | *yield = buffer[0]; |
581 | return TRUE; | |
582 | } | |
583 | ||
584 | /* No data was read. If there is no errno, this must be the EOF (i.e. | |
19b9dc85 PH |
585 | connection closed) case, which causes deferral. An explicit connection reset |
586 | error has the same effect. Otherwise, put the host's identity in the message, | |
587 | leaving the errno value to be interpreted as well. In all cases, we have to | |
588 | assume the connection is now dead. */ | |
0756eb3c | 589 | |
19b9dc85 | 590 | if (*errno_value == 0 || *errno_value == ECONNRESET) |
0756eb3c PH |
591 | { |
592 | *errno_value = ERRNO_SMTPCLOSED; | |
c562fd30 JH |
593 | *message = US string_sprintf("Remote host closed connection " |
594 | "in response to %s%s", pl, smtp_command); | |
0756eb3c PH |
595 | } |
596 | else *message = US string_sprintf("%s [%s]", host->name, host->address); | |
597 | ||
598 | return FALSE; | |
599 | } | |
600 | ||
601 | ||
602 | ||
603 | /************************************************* | |
604 | * Write error message to logs * | |
605 | *************************************************/ | |
606 | ||
607 | /* This writes to the main log and to the message log. | |
608 | ||
609 | Arguments: | |
610 | addr the address item containing error information | |
611 | host the current host | |
612 | ||
613 | Returns: nothing | |
614 | */ | |
615 | ||
616 | static void | |
617 | write_logs(address_item *addr, host_item *host) | |
618 | { | |
c562fd30 JH |
619 | uschar * message = string_sprintf("H=%s [%s]", host->name, host->address); |
620 | ||
621 | if (addr->message) | |
0756eb3c | 622 | { |
c562fd30 | 623 | message = string_sprintf("%s: %s", message, addr->message); |
0756eb3c PH |
624 | if (addr->basic_errno > 0) |
625 | message = string_sprintf("%s: %s", message, strerror(addr->basic_errno)); | |
626 | log_write(0, LOG_MAIN, "%s", message); | |
627 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); | |
628 | } | |
629 | else | |
630 | { | |
c562fd30 JH |
631 | if (log_extra_selector & LX_outgoing_port) |
632 | message = string_sprintf("%s:%d", message, | |
633 | host->port == PORT_NONE ? 25 : host->port); | |
634 | log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno)); | |
635 | deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, | |
636 | strerror(addr->basic_errno)); | |
0756eb3c PH |
637 | } |
638 | } | |
639 | ||
c562fd30 JH |
640 | static void |
641 | msglog_line(host_item * host, uschar * message) | |
642 | { | |
643 | deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log), | |
644 | host->name, host->address, message); | |
645 | } | |
646 | ||
0756eb3c PH |
647 | |
648 | ||
774ef2d7 | 649 | #ifdef EXPERIMENTAL_EVENT |
d68218c7 JH |
650 | /************************************************* |
651 | * Post-defer action * | |
652 | *************************************************/ | |
653 | ||
654 | /* This expands an arbitrary per-transport string. | |
655 | It might, for example, be used to write to the database log. | |
656 | ||
657 | Arguments: | |
d68218c7 JH |
658 | addr the address item containing error information |
659 | host the current host | |
660 | ||
661 | Returns: nothing | |
662 | */ | |
663 | ||
664 | static void | |
774ef2d7 | 665 | deferred_event_raise(address_item *addr, host_item *host) |
d68218c7 | 666 | { |
774ef2d7 | 667 | uschar * action = addr->transport->event_action; |
a7538db1 JH |
668 | uschar * save_domain; |
669 | uschar * save_local; | |
670 | ||
d68218c7 | 671 | if (!action) |
a7538db1 | 672 | return; |
d68218c7 | 673 | |
a7538db1 JH |
674 | save_domain = deliver_domain; |
675 | save_local = deliver_localpart; | |
676 | ||
677 | /*XXX would ip & port already be set up? */ | |
678 | deliver_host_address = string_copy(host->address); | |
774ef2d7 JH |
679 | deliver_host_port = host->port == PORT_NONE ? 25 : host->port; |
680 | event_defer_errno = addr->basic_errno; | |
d68218c7 JH |
681 | |
682 | router_name = addr->router->name; | |
683 | transport_name = addr->transport->name; | |
a7538db1 JH |
684 | deliver_domain = addr->domain; |
685 | deliver_localpart = addr->local_part; | |
686 | ||
774ef2d7 | 687 | (void) event_raise(action, US"msg:host:defer", |
a7538db1 JH |
688 | addr->message |
689 | ? addr->basic_errno > 0 | |
690 | ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno)) | |
691 | : string_copy(addr->message) | |
692 | : addr->basic_errno > 0 | |
693 | ? string_copy(US strerror(addr->basic_errno)) | |
694 | : NULL); | |
695 | ||
696 | deliver_localpart = save_local; | |
697 | deliver_domain = save_domain; | |
d68218c7 JH |
698 | router_name = transport_name = NULL; |
699 | } | |
700 | #endif | |
701 | ||
702 | ||
703 | ||
0756eb3c PH |
704 | /************************************************* |
705 | * Synchronize SMTP responses * | |
706 | *************************************************/ | |
707 | ||
708 | /* This function is called from smtp_deliver() to receive SMTP responses from | |
709 | the server, and match them up with the commands to which they relate. When | |
710 | PIPELINING is not in use, this function is called after every command, and is | |
711 | therefore somewhat over-engineered, but it is simpler to use a single scheme | |
712 | that works both with and without PIPELINING instead of having two separate sets | |
713 | of code. | |
714 | ||
715 | The set of commands that are buffered up with pipelining may start with MAIL | |
716 | and may end with DATA; in between are RCPT commands that correspond to the | |
717 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, | |
718 | etc.) are never buffered. | |
719 | ||
720 | Errors after MAIL or DATA abort the whole process leaving the response in the | |
721 | buffer. After MAIL, pending responses are flushed, and the original command is | |
722 | re-instated in big_buffer for error messages. For RCPT commands, the remote is | |
723 | permitted to reject some recipient addresses while accepting others. However | |
724 | certain errors clearly abort the whole process. Set the value in | |
725 | transport_return to PENDING_OK if the address is accepted. If there is a | |
726 | subsequent general error, it will get reset accordingly. If not, it will get | |
727 | converted to OK at the end. | |
728 | ||
729 | Arguments: | |
48c7f9e2 PH |
730 | addrlist the complete address list |
731 | include_affixes TRUE if affixes include in RCPT | |
732 | sync_addr ptr to the ptr of the one to start scanning at (updated) | |
733 | host the host we are connected to | |
734 | count the number of responses to read | |
735 | address_retry_ | |
736 | include_sender true if 4xx retry is to include the sender it its key | |
737 | pending_MAIL true if the first response is for MAIL | |
738 | pending_DATA 0 if last command sent was not DATA | |
739 | +1 if previously had a good recipient | |
740 | -1 if not previously had a good recipient | |
741 | inblock incoming SMTP block | |
742 | timeout timeout value | |
743 | buffer buffer for reading response | |
744 | buffsize size of buffer | |
0756eb3c PH |
745 | |
746 | Returns: 3 if at least one address had 2xx and one had 5xx | |
747 | 2 if at least one address had 5xx but none had 2xx | |
748 | 1 if at least one host had a 2xx response, but none had 5xx | |
749 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) | |
750 | -1 timeout while reading RCPT response | |
751 | -2 I/O or other non-response error for RCPT | |
752 | -3 DATA or MAIL failed - errno and buffer set | |
753 | */ | |
754 | ||
755 | static int | |
756 | sync_responses(address_item *addrlist, BOOL include_affixes, | |
48c7f9e2 PH |
757 | address_item **sync_addr, host_item *host, int count, |
758 | BOOL address_retry_include_sender, BOOL pending_MAIL, | |
0756eb3c PH |
759 | int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer, |
760 | int buffsize) | |
761 | { | |
762 | address_item *addr = *sync_addr; | |
763 | int yield = 0; | |
764 | ||
765 | /* Handle the response for a MAIL command. On error, reinstate the original | |
766 | command in big_buffer for error message use, and flush any further pending | |
767 | responses before returning, except after I/O errors and timeouts. */ | |
768 | ||
769 | if (pending_MAIL) | |
770 | { | |
771 | count--; | |
772 | if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
773 | { | |
774 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ | |
775 | if (errno == 0 && buffer[0] != 0) | |
776 | { | |
777 | uschar flushbuffer[4096]; | |
e97957bc PH |
778 | int save_errno = 0; |
779 | if (buffer[0] == '4') | |
780 | { | |
781 | save_errno = ERRNO_MAIL4XX; | |
782 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
783 | } | |
0756eb3c PH |
784 | while (count-- > 0) |
785 | { | |
786 | if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer), | |
787 | '2', timeout) | |
788 | && (errno != 0 || flushbuffer[0] == 0)) | |
789 | break; | |
790 | } | |
e97957bc | 791 | errno = save_errno; |
0756eb3c | 792 | } |
c562fd30 JH |
793 | |
794 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
795 | while (count-- > 0) /* Mark any pending addrs with the host used */ | |
796 | { | |
797 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; | |
798 | addr->host_used = host; | |
799 | addr = addr->next; | |
800 | } | |
0756eb3c PH |
801 | return -3; |
802 | } | |
803 | } | |
804 | ||
805 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
806 | ||
807 | /* Read and handle the required number of RCPT responses, matching each one up | |
808 | with an address by scanning for the next address whose status is PENDING_DEFER. | |
809 | */ | |
810 | ||
811 | while (count-- > 0) | |
812 | { | |
813 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; | |
814 | ||
815 | /* The address was accepted */ | |
c562fd30 | 816 | addr->host_used = host; |
0756eb3c PH |
817 | |
818 | if (smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
819 | { | |
820 | yield |= 1; | |
821 | addr->transport_return = PENDING_OK; | |
822 | ||
823 | /* If af_dr_retry_exists is set, there was a routing delay on this address; | |
09945f1e PH |
824 | ensure that any address-specific retry record is expunged. We do this both |
825 | for the basic key and for the version that also includes the sender. */ | |
0756eb3c PH |
826 | |
827 | if (testflag(addr, af_dr_retry_exists)) | |
09945f1e PH |
828 | { |
829 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, | |
830 | sender_address); | |
831 | retry_add_item(addr, altkey, rf_delete); | |
0756eb3c | 832 | retry_add_item(addr, addr->address_retry_key, rf_delete); |
09945f1e | 833 | } |
0756eb3c PH |
834 | } |
835 | ||
836 | /* Timeout while reading the response */ | |
837 | ||
838 | else if (errno == ETIMEDOUT) | |
839 | { | |
840 | int save_errno = errno; | |
c562fd30 JH |
841 | uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>", |
842 | transport_rcpt_address(addr, include_affixes)); | |
843 | set_errno(addrlist, save_errno, message, DEFER, FALSE, NULL); | |
0756eb3c | 844 | retry_add_item(addr, addr->address_retry_key, 0); |
f6c332bd | 845 | update_waiting = FALSE; |
0756eb3c PH |
846 | return -1; |
847 | } | |
848 | ||
849 | /* Handle other errors in obtaining an SMTP response by returning -1. This | |
850 | will cause all the addresses to be deferred. Restore the SMTP command in | |
851 | big_buffer for which we are checking the response, so the error message | |
852 | makes sense. */ | |
853 | ||
854 | else if (errno != 0 || buffer[0] == 0) | |
855 | { | |
856 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", | |
857 | transport_rcpt_address(addr, include_affixes)); | |
858 | return -2; | |
859 | } | |
860 | ||
861 | /* Handle SMTP permanent and temporary response codes. */ | |
862 | ||
863 | else | |
864 | { | |
865 | addr->message = | |
447d236c | 866 | string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: " |
c562fd30 JH |
867 | "%s", transport_rcpt_address(addr, include_affixes), |
868 | string_printing(buffer)); | |
447d236c | 869 | setflag(addr, af_pass_message); |
c562fd30 | 870 | msglog_line(host, addr->message); |
0756eb3c PH |
871 | |
872 | /* The response was 5xx */ | |
873 | ||
874 | if (buffer[0] == '5') | |
875 | { | |
876 | addr->transport_return = FAIL; | |
877 | yield |= 2; | |
878 | } | |
879 | ||
880 | /* The response was 4xx */ | |
881 | ||
882 | else | |
883 | { | |
0756eb3c PH |
884 | addr->transport_return = DEFER; |
885 | addr->basic_errno = ERRNO_RCPT4XX; | |
e97957bc | 886 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
0756eb3c | 887 | |
c562fd30 JH |
888 | /* Log temporary errors if there are more hosts to be tried. |
889 | If not, log this last one in the == line. */ | |
0756eb3c | 890 | |
c562fd30 JH |
891 | if (host->next) |
892 | log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message); | |
0756eb3c | 893 | |
f6c332bd PH |
894 | /* Do not put this message on the list of those waiting for specific |
895 | hosts, as otherwise it is likely to be tried too often. */ | |
0756eb3c | 896 | |
f6c332bd | 897 | update_waiting = FALSE; |
0756eb3c | 898 | |
48c7f9e2 PH |
899 | /* Add a retry item for the address so that it doesn't get tried again |
900 | too soon. If address_retry_include_sender is true, add the sender address | |
901 | to the retry key. */ | |
0756eb3c | 902 | |
48c7f9e2 PH |
903 | if (address_retry_include_sender) |
904 | { | |
905 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, | |
906 | sender_address); | |
907 | retry_add_item(addr, altkey, 0); | |
908 | } | |
909 | else retry_add_item(addr, addr->address_retry_key, 0); | |
0756eb3c PH |
910 | } |
911 | } | |
912 | } /* Loop for next RCPT response */ | |
913 | ||
914 | /* Update where to start at for the next block of responses, unless we | |
915 | have already handled all the addresses. */ | |
916 | ||
917 | if (addr != NULL) *sync_addr = addr->next; | |
918 | ||
919 | /* Handle a response to DATA. If we have not had any good recipients, either | |
920 | previously or in this block, the response is ignored. */ | |
921 | ||
922 | if (pending_DATA != 0 && | |
923 | !smtp_read_response(inblock, buffer, buffsize, '3', timeout)) | |
924 | { | |
925 | int code; | |
926 | uschar *msg; | |
447d236c | 927 | BOOL pass_message; |
e97957bc PH |
928 | if (pending_DATA > 0 || (yield & 1) != 0) |
929 | { | |
930 | if (errno == 0 && buffer[0] == '4') | |
931 | { | |
932 | errno = ERRNO_DATA4XX; | |
933 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
934 | } | |
935 | return -3; | |
936 | } | |
447d236c | 937 | (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message); |
0756eb3c PH |
938 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " |
939 | "is in use and there were no good recipients\n", msg); | |
940 | } | |
941 | ||
942 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if | |
943 | present) received 3xx. If any RCPTs were handled and yielded anything other | |
944 | than 4xx, yield will be set non-zero. */ | |
945 | ||
946 | return yield; | |
947 | } | |
948 | ||
949 | ||
950 | ||
fcc8e047 JH |
951 | /* Do the client side of smtp-level authentication */ |
952 | /* | |
953 | Arguments: | |
954 | buffer EHLO response from server (gets overwritten) | |
955 | addrlist chain of potential addresses to deliver | |
956 | host host to deliver to | |
957 | ob transport options | |
958 | ibp, obp comms channel control blocks | |
959 | ||
960 | Returns: | |
961 | OK Success, or failed (but not required): global "smtp_authenticated" set | |
962 | DEFER Failed authentication (and was required) | |
963 | ERROR Internal problem | |
964 | ||
965 | FAIL_SEND Failed communications - transmit | |
966 | FAIL - response | |
967 | */ | |
968 | ||
969 | int | |
970 | smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host, | |
971 | smtp_transport_options_block *ob, BOOL is_esmtp, | |
972 | smtp_inblock *ibp, smtp_outblock *obp) | |
973 | { | |
a7538db1 JH |
974 | int require_auth; |
975 | uschar *fail_reason = US"server did not advertise AUTH support"; | |
fcc8e047 | 976 | |
a7538db1 JH |
977 | smtp_authenticated = FALSE; |
978 | client_authenticator = client_authenticated_id = client_authenticated_sender = NULL; | |
5130845b | 979 | require_auth = verify_check_given_host(&ob->hosts_require_auth, host); |
fcc8e047 | 980 | |
a7538db1 JH |
981 | if (is_esmtp && !regex_AUTH) regex_AUTH = |
982 | regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)", | |
983 | FALSE, TRUE); | |
fcc8e047 | 984 | |
a7538db1 JH |
985 | if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1)) |
986 | { | |
987 | uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]); | |
988 | expand_nmax = -1; /* reset */ | |
fcc8e047 | 989 | |
a7538db1 JH |
990 | /* Must not do this check until after we have saved the result of the |
991 | regex match above. */ | |
fcc8e047 | 992 | |
a7538db1 | 993 | if (require_auth == OK || |
5130845b | 994 | verify_check_given_host(&ob->hosts_try_auth, host) == OK) |
a7538db1 JH |
995 | { |
996 | auth_instance *au; | |
997 | fail_reason = US"no common mechanisms were found"; | |
fcc8e047 | 998 | |
a7538db1 | 999 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); |
fcc8e047 | 1000 | |
a7538db1 JH |
1001 | /* Scan the configured authenticators looking for one which is configured |
1002 | for use as a client, which is not suppressed by client_condition, and | |
1003 | whose name matches an authentication mechanism supported by the server. | |
1004 | If one is found, attempt to authenticate by calling its client function. | |
1005 | */ | |
fcc8e047 | 1006 | |
a7538db1 JH |
1007 | for (au = auths; !smtp_authenticated && au != NULL; au = au->next) |
1008 | { | |
1009 | uschar *p = names; | |
1010 | if (!au->client || | |
1011 | (au->client_condition != NULL && | |
1012 | !expand_check_condition(au->client_condition, au->name, | |
1013 | US"client authenticator"))) | |
1014 | { | |
1015 | DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n", | |
1016 | au->name, | |
1017 | (au->client)? "client_condition is false" : | |
1018 | "not configured as a client"); | |
1019 | continue; | |
1020 | } | |
fcc8e047 | 1021 | |
a7538db1 | 1022 | /* Loop to scan supported server mechanisms */ |
fcc8e047 | 1023 | |
a7538db1 JH |
1024 | while (*p != 0) |
1025 | { | |
1026 | int rc; | |
1027 | int len = Ustrlen(au->public_name); | |
1028 | while (isspace(*p)) p++; | |
fcc8e047 | 1029 | |
a7538db1 JH |
1030 | if (strncmpic(au->public_name, p, len) != 0 || |
1031 | (p[len] != 0 && !isspace(p[len]))) | |
1032 | { | |
1033 | while (*p != 0 && !isspace(*p)) p++; | |
1034 | continue; | |
1035 | } | |
fcc8e047 | 1036 | |
a7538db1 JH |
1037 | /* Found data for a listed mechanism. Call its client entry. Set |
1038 | a flag in the outblock so that data is overwritten after sending so | |
1039 | that reflections don't show it. */ | |
fcc8e047 | 1040 | |
a7538db1 JH |
1041 | fail_reason = US"authentication attempt(s) failed"; |
1042 | obp->authenticating = TRUE; | |
1043 | rc = (au->info->clientcode)(au, ibp, obp, | |
1044 | ob->command_timeout, buffer, bufsize); | |
1045 | obp->authenticating = FALSE; | |
1046 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", | |
1047 | au->name, rc); | |
fcc8e047 | 1048 | |
a7538db1 JH |
1049 | /* A temporary authentication failure must hold up delivery to |
1050 | this host. After a permanent authentication failure, we carry on | |
1051 | to try other authentication methods. If all fail hard, try to | |
1052 | deliver the message unauthenticated unless require_auth was set. */ | |
fcc8e047 | 1053 | |
a7538db1 JH |
1054 | switch(rc) |
1055 | { | |
1056 | case OK: | |
1057 | smtp_authenticated = TRUE; /* stops the outer loop */ | |
1058 | client_authenticator = au->name; | |
1059 | if (au->set_client_id != NULL) | |
1060 | client_authenticated_id = expand_string(au->set_client_id); | |
1061 | break; | |
1062 | ||
1063 | /* Failure after writing a command */ | |
1064 | ||
1065 | case FAIL_SEND: | |
1066 | return FAIL_SEND; | |
1067 | ||
1068 | /* Failure after reading a response */ | |
1069 | ||
1070 | case FAIL: | |
1071 | if (errno != 0 || buffer[0] != '5') return FAIL; | |
1072 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", | |
1073 | au->name, host->name, host->address, buffer); | |
1074 | break; | |
1075 | ||
1076 | /* Failure by some other means. In effect, the authenticator | |
1077 | decided it wasn't prepared to handle this case. Typically this | |
1078 | is the result of "fail" in an expansion string. Do we need to | |
1079 | log anything here? Feb 2006: a message is now put in the buffer | |
1080 | if logging is required. */ | |
1081 | ||
1082 | case CANCELLED: | |
1083 | if (*buffer != 0) | |
1084 | log_write(0, LOG_MAIN, "%s authenticator cancelled " | |
1085 | "authentication H=%s [%s] %s", au->name, host->name, | |
1086 | host->address, buffer); | |
1087 | break; | |
1088 | ||
1089 | /* Internal problem, message in buffer. */ | |
1090 | ||
1091 | case ERROR: | |
c562fd30 | 1092 | set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE, NULL); |
a7538db1 JH |
1093 | return ERROR; |
1094 | } | |
fcc8e047 | 1095 | |
a7538db1 JH |
1096 | break; /* If not authenticated, try next authenticator */ |
1097 | } /* Loop for scanning supported server mechanisms */ | |
1098 | } /* Loop for further authenticators */ | |
fcc8e047 | 1099 | } |
a7538db1 | 1100 | } |
fcc8e047 | 1101 | |
a7538db1 | 1102 | /* If we haven't authenticated, but are required to, give up. */ |
fcc8e047 | 1103 | |
a7538db1 JH |
1104 | if (require_auth == OK && !smtp_authenticated) |
1105 | { | |
1106 | set_errno(addrlist, ERRNO_AUTHFAIL, | |
1107 | string_sprintf("authentication required but %s", fail_reason), DEFER, | |
c562fd30 | 1108 | FALSE, NULL); |
a7538db1 JH |
1109 | return DEFER; |
1110 | } | |
4d8d62b9 | 1111 | |
a7538db1 | 1112 | return OK; |
fcc8e047 JH |
1113 | } |
1114 | ||
1115 | ||
1116 | /* Construct AUTH appendix string for MAIL TO */ | |
1117 | /* | |
1118 | Arguments | |
1119 | buffer to build string | |
1120 | addrlist chain of potential addresses to deliver | |
1121 | ob transport options | |
1122 | ||
1123 | Globals smtp_authenticated | |
1124 | client_authenticated_sender | |
1125 | Return True on error, otherwise buffer has (possibly empty) terminated string | |
1126 | */ | |
1127 | ||
1128 | BOOL | |
1129 | smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist, | |
1130 | smtp_transport_options_block *ob) | |
1131 | { | |
1132 | uschar *local_authenticated_sender = authenticated_sender; | |
1133 | ||
1134 | #ifdef notdef | |
1135 | debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N"); | |
1136 | #endif | |
1137 | ||
1138 | if (ob->authenticated_sender != NULL) | |
1139 | { | |
1140 | uschar *new = expand_string(ob->authenticated_sender); | |
1141 | if (new == NULL) | |
1142 | { | |
1143 | if (!expand_string_forcedfail) | |
1144 | { | |
1145 | uschar *message = string_sprintf("failed to expand " | |
1146 | "authenticated_sender: %s", expand_string_message); | |
c562fd30 | 1147 | set_errno(addrlist, 0, message, DEFER, FALSE, NULL); |
fcc8e047 JH |
1148 | return TRUE; |
1149 | } | |
1150 | } | |
1151 | else if (new[0] != 0) local_authenticated_sender = new; | |
1152 | } | |
1153 | ||
1154 | /* Add the authenticated sender address if present */ | |
1155 | ||
1156 | if ((smtp_authenticated || ob->authenticated_sender_force) && | |
1157 | local_authenticated_sender != NULL) | |
1158 | { | |
1159 | string_format(buffer, bufsize, " AUTH=%s", | |
1160 | auth_xtextencode(local_authenticated_sender, | |
1161 | Ustrlen(local_authenticated_sender))); | |
1162 | client_authenticated_sender = string_copy(local_authenticated_sender); | |
1163 | } | |
1164 | else | |
1165 | *buffer= 0; | |
1166 | ||
1167 | return FALSE; | |
1168 | } | |
1169 | ||
1170 | ||
1171 | ||
0e66b3b6 JH |
1172 | #ifdef EXPERIMENTAL_DANE |
1173 | int | |
b8b1b5cb | 1174 | tlsa_lookup(const host_item * host, dns_answer * dnsa, |
0e66b3b6 JH |
1175 | BOOL dane_required, BOOL * dane) |
1176 | { | |
1177 | /* move this out to host.c given the similarity to dns_lookup() ? */ | |
1178 | uschar buffer[300]; | |
1179 | uschar * fullname = buffer; | |
1180 | ||
1181 | /* TLSA lookup string */ | |
1182 | (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name); | |
1183 | ||
1184 | switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname)) | |
1185 | { | |
1186 | case DNS_AGAIN: | |
1187 | return DEFER; /* just defer this TLS'd conn */ | |
1188 | ||
1189 | default: | |
1190 | case DNS_FAIL: | |
1191 | if (dane_required) | |
1192 | { | |
1193 | log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed"); | |
1194 | return FAIL; | |
1195 | } | |
1196 | break; | |
1197 | ||
1198 | case DNS_SUCCEED: | |
1199 | if (!dns_is_secure(dnsa)) | |
1200 | { | |
1201 | log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC"); | |
1202 | return DEFER; | |
1203 | } | |
1204 | *dane = TRUE; | |
1205 | break; | |
1206 | } | |
1207 | return OK; | |
1208 | } | |
1209 | #endif | |
1210 | ||
1211 | ||
0756eb3c PH |
1212 | /************************************************* |
1213 | * Deliver address list to given host * | |
1214 | *************************************************/ | |
1215 | ||
1216 | /* If continue_hostname is not null, we get here only when continuing to | |
1217 | deliver down an existing channel. The channel was passed as the standard | |
6c512171 PH |
1218 | input. TLS is never active on a passed channel; the previous process always |
1219 | closes it down before passing the connection on. | |
0756eb3c PH |
1220 | |
1221 | Otherwise, we have to make a connection to the remote host, and do the | |
1222 | initial protocol exchange. | |
1223 | ||
1224 | When running as an MUA wrapper, if the sender or any recipient is rejected, | |
1225 | temporarily or permanently, we force failure for all recipients. | |
1226 | ||
1227 | Arguments: | |
1228 | addrlist chain of potential addresses to deliver; only those whose | |
1229 | transport_return field is set to PENDING_DEFER are currently | |
1230 | being processed; others should be skipped - they have either | |
1231 | been delivered to an earlier host or IP address, or been | |
1232 | failed by one of them. | |
1233 | host host to deliver to | |
1234 | host_af AF_INET or AF_INET6 | |
2d280592 | 1235 | port default TCP/IP port to use, in host byte order |
0756eb3c PH |
1236 | interface interface to bind to, or NULL |
1237 | tblock transport instance block | |
0756eb3c PH |
1238 | message_defer set TRUE if yield is OK, but all addresses were deferred |
1239 | because of a non-recipient, non-host failure, that is, a | |
1240 | 4xx response to MAIL FROM, DATA, or ".". This is a defer | |
1241 | that is specific to the message. | |
1242 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for | |
1243 | a second attempt after TLS initialization fails | |
1244 | ||
1245 | Returns: OK - the connection was made and the delivery attempted; | |
1246 | the result for each address is in its data block. | |
1247 | DEFER - the connection could not be made, or something failed | |
1248 | while setting up the SMTP session, or there was a | |
1249 | non-message-specific error, such as a timeout. | |
1250 | ERROR - a filter command is specified for this transport, | |
1251 | and there was a problem setting it up; OR helo_data | |
1252 | or add_headers or authenticated_sender is specified | |
1253 | for this transport, and the string failed to expand | |
1254 | */ | |
1255 | ||
1256 | static int | |
1257 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port, | |
d427a7f9 | 1258 | uschar *interface, transport_instance *tblock, |
0756eb3c PH |
1259 | BOOL *message_defer, BOOL suppress_tls) |
1260 | { | |
1261 | address_item *addr; | |
1262 | address_item *sync_addr; | |
1263 | address_item *first_addr = addrlist; | |
1264 | int yield = OK; | |
1265 | int address_count; | |
1266 | int save_errno; | |
1267 | int rc; | |
1268 | time_t start_delivery_time = time(NULL); | |
1269 | smtp_transport_options_block *ob = | |
1270 | (smtp_transport_options_block *)(tblock->options_block); | |
1271 | BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0; | |
061b7ebd | 1272 | BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0; |
0756eb3c PH |
1273 | BOOL ok = FALSE; |
1274 | BOOL send_rset = TRUE; | |
1275 | BOOL send_quit = TRUE; | |
1276 | BOOL setting_up = TRUE; | |
1277 | BOOL completed_address = FALSE; | |
1278 | BOOL esmtp = TRUE; | |
1279 | BOOL pending_MAIL; | |
447d236c | 1280 | BOOL pass_message = FALSE; |
8ccd00b1 | 1281 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
1282 | BOOL prdr_offered = FALSE; |
1283 | BOOL prdr_active; | |
1284 | #endif | |
6c1c3d1d WB |
1285 | #ifdef EXPERIMENTAL_DSN |
1286 | BOOL dsn_all_lasthop = TRUE; | |
1287 | #endif | |
0e66b3b6 JH |
1288 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
1289 | BOOL dane = FALSE; | |
1290 | dns_answer tlsa_dnsa; | |
1291 | #endif | |
0756eb3c PH |
1292 | smtp_inblock inblock; |
1293 | smtp_outblock outblock; | |
1294 | int max_rcpt = tblock->max_addresses; | |
f1513293 | 1295 | uschar *igquotstr = US""; |
41c7c167 | 1296 | uschar *helo_data = NULL; |
0756eb3c PH |
1297 | uschar *message = NULL; |
1298 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; | |
1299 | uschar *p; | |
1300 | uschar buffer[4096]; | |
1301 | uschar inbuffer[4096]; | |
98470202 | 1302 | uschar outbuffer[4096]; |
0756eb3c PH |
1303 | |
1304 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ | |
1305 | ||
1306 | *message_defer = FALSE; | |
1307 | smtp_command = US"initial connection"; | |
1308 | if (max_rcpt == 0) max_rcpt = 999999; | |
1309 | ||
1310 | /* Set up the buffer for reading SMTP response packets. */ | |
1311 | ||
1312 | inblock.buffer = inbuffer; | |
1313 | inblock.buffersize = sizeof(inbuffer); | |
1314 | inblock.ptr = inbuffer; | |
1315 | inblock.ptrend = inbuffer; | |
1316 | ||
1317 | /* Set up the buffer for holding SMTP commands while pipelining */ | |
1318 | ||
1319 | outblock.buffer = outbuffer; | |
1320 | outblock.buffersize = sizeof(outbuffer); | |
1321 | outblock.ptr = outbuffer; | |
1322 | outblock.cmd_count = 0; | |
1323 | outblock.authenticating = FALSE; | |
1324 | ||
6c512171 PH |
1325 | /* Reset the parameters of a TLS session. */ |
1326 | ||
817d9f57 JH |
1327 | tls_out.bits = 0; |
1328 | tls_out.cipher = NULL; /* the one we may use for this transport */ | |
9d1c15ef JH |
1329 | tls_out.ourcert = NULL; |
1330 | tls_out.peercert = NULL; | |
817d9f57 JH |
1331 | tls_out.peerdn = NULL; |
1332 | #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS) | |
1333 | tls_out.sni = NULL; | |
5b456975 | 1334 | #endif |
018058b2 | 1335 | tls_out.ocsp = OCSP_NOT_REQ; |
6c512171 | 1336 | |
35aba663 JH |
1337 | /* Flip the legacy TLS-related variables over to the outbound set in case |
1338 | they're used in the context of the transport. Don't bother resetting | |
1339 | afterward as we're in a subprocess. */ | |
1340 | ||
1341 | tls_modify_variables(&tls_out); | |
1342 | ||
061b7ebd PP |
1343 | #ifndef SUPPORT_TLS |
1344 | if (smtps) | |
1345 | { | |
c562fd30 | 1346 | set_errno(addrlist, 0, US"TLS support not available", DEFER, FALSE, NULL); |
018058b2 | 1347 | return ERROR; |
061b7ebd PP |
1348 | } |
1349 | #endif | |
1350 | ||
0756eb3c PH |
1351 | /* Make a connection to the host if this isn't a continued delivery, and handle |
1352 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled | |
1353 | specially so they can be identified for retries. */ | |
1354 | ||
1355 | if (continue_hostname == NULL) | |
1356 | { | |
a7538db1 | 1357 | /* This puts port into host->port */ |
0756eb3c PH |
1358 | inblock.sock = outblock.sock = |
1359 | smtp_connect(host, host_af, port, interface, ob->connect_timeout, | |
a7538db1 | 1360 | ob->keepalive, ob->dscp |
774ef2d7 JH |
1361 | #ifdef EXPERIMENTAL_EVENT |
1362 | , tblock->event_action | |
a7538db1 JH |
1363 | #endif |
1364 | ); | |
4311097e | 1365 | |
0756eb3c PH |
1366 | if (inblock.sock < 0) |
1367 | { | |
1368 | set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno, | |
c562fd30 | 1369 | NULL, DEFER, FALSE, NULL); |
0756eb3c PH |
1370 | return DEFER; |
1371 | } | |
1372 | ||
0e66b3b6 JH |
1373 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
1374 | { | |
1375 | BOOL dane_required; | |
1376 | ||
1377 | tls_out.dane_verified = FALSE; | |
1378 | tls_out.tlsa_usage = 0; | |
1379 | ||
5130845b | 1380 | dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK; |
0e66b3b6 JH |
1381 | |
1382 | if (host->dnssec == DS_YES) | |
1383 | { | |
1384 | if( dane_required | |
5130845b | 1385 | || verify_check_given_host(&ob->hosts_try_dane, host) == OK |
0e66b3b6 JH |
1386 | ) |
1387 | if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK) | |
1388 | return rc; | |
1389 | } | |
1390 | else if (dane_required) | |
1391 | { | |
1392 | log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name); | |
1393 | return FAIL; | |
1394 | } | |
1395 | ||
1396 | if (dane) | |
1397 | ob->tls_tempfail_tryclear = FALSE; | |
1398 | } | |
1399 | #endif /*DANE*/ | |
1400 | ||
41c7c167 PH |
1401 | /* Expand the greeting message while waiting for the initial response. (Makes |
1402 | sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is | |
1403 | delayed till here so that $sending_interface and $sending_port are set. */ | |
1404 | ||
1405 | helo_data = expand_string(ob->helo_data); | |
1406 | ||
0756eb3c PH |
1407 | /* The first thing is to wait for an initial OK response. The dreaded "goto" |
1408 | is nevertheless a reasonably clean way of programming this kind of logic, | |
1409 | where you want to escape on any error. */ | |
1410 | ||
061b7ebd PP |
1411 | if (!smtps) |
1412 | { | |
1413 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1414 | ob->command_timeout)) goto RESPONSE_FAILED; | |
0756eb3c | 1415 | |
774ef2d7 | 1416 | #ifdef EXPERIMENTAL_EVENT |
b30275b8 | 1417 | { |
805c9d53 JH |
1418 | uschar * s; |
1419 | lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes" | |
1420 | : host->dnssec==DS_NO ? US"no" : NULL; | |
1421 | s = event_raise(tblock->event_action, US"smtp:connect", buffer); | |
b30275b8 | 1422 | if (s) |
a7538db1 | 1423 | { |
b30275b8 JH |
1424 | set_errno(addrlist, 0, |
1425 | string_sprintf("deferred by smtp:connect event expansion: %s", s), | |
1426 | DEFER, FALSE, NULL); | |
a7538db1 JH |
1427 | yield = DEFER; |
1428 | goto SEND_QUIT; | |
1429 | } | |
b30275b8 | 1430 | } |
a7538db1 JH |
1431 | #endif |
1432 | ||
061b7ebd PP |
1433 | /* Now check if the helo_data expansion went well, and sign off cleanly if |
1434 | it didn't. */ | |
41c7c167 | 1435 | |
061b7ebd PP |
1436 | if (helo_data == NULL) |
1437 | { | |
1438 | uschar *message = string_sprintf("failed to expand helo_data: %s", | |
1439 | expand_string_message); | |
c562fd30 | 1440 | set_errno(addrlist, 0, message, DEFER, FALSE, NULL); |
061b7ebd PP |
1441 | yield = DEFER; |
1442 | goto SEND_QUIT; | |
1443 | } | |
41c7c167 PH |
1444 | } |
1445 | ||
0756eb3c PH |
1446 | /** Debugging without sending a message |
1447 | addrlist->transport_return = DEFER; | |
1448 | goto SEND_QUIT; | |
1449 | **/ | |
1450 | ||
1451 | /* Errors that occur after this point follow an SMTP command, which is | |
1452 | left in big_buffer by smtp_write_command() for use in error messages. */ | |
1453 | ||
1454 | smtp_command = big_buffer; | |
1455 | ||
1456 | /* Tell the remote who we are... | |
1457 | ||
1458 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the | |
1459 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the | |
1460 | greeting is of this form. The assumption was that the far end supports it | |
1461 | properly... but experience shows that there are some that give 5xx responses, | |
1462 | even though the banner includes "ESMTP" (there's a bloody-minded one that | |
1463 | says "ESMTP not spoken here"). Cope with that case. | |
1464 | ||
1465 | September 2000: Time has passed, and it seems reasonable now to always send | |
1466 | EHLO at the start. It is also convenient to make the change while installing | |
1467 | the TLS stuff. | |
1468 | ||
1469 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" | |
1470 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There | |
1471 | would be no way to send out the mails, so there is now a host list | |
1472 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the | |
1473 | PIPELINING problem as well. Maybe it can also be useful to cure other | |
1474 | problems with broken servers. | |
1475 | ||
1476 | Exim originally sent "Helo" at this point and ran for nearly a year that way. | |
1477 | Then somebody tried it with a Microsoft mailer... It seems that all other | |
1478 | mailers use upper case for some reason (the RFC is quite clear about case | |
1479 | independence) so, for peace of mind, I gave in. */ | |
1480 | ||
5130845b | 1481 | esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK; |
0756eb3c | 1482 | |
061b7ebd PP |
1483 | /* Alas; be careful, since this goto is not an error-out, so conceivably |
1484 | we might set data between here and the target which we assume to exist | |
1485 | and be usable. I can see this coming back to bite us. */ | |
a7538db1 | 1486 | #ifdef SUPPORT_TLS |
061b7ebd PP |
1487 | if (smtps) |
1488 | { | |
1489 | tls_offered = TRUE; | |
1490 | suppress_tls = FALSE; | |
1491 | ob->tls_tempfail_tryclear = FALSE; | |
1492 | smtp_command = US"SSL-on-connect"; | |
1493 | goto TLS_NEGOTIATE; | |
1494 | } | |
a7538db1 | 1495 | #endif |
061b7ebd | 1496 | |
0756eb3c PH |
1497 | if (esmtp) |
1498 | { | |
1499 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", | |
1500 | lmtp? "LHLO" : "EHLO", helo_data) < 0) | |
1501 | goto SEND_FAILED; | |
1502 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1503 | ob->command_timeout)) | |
1504 | { | |
1505 | if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED; | |
1506 | esmtp = FALSE; | |
1507 | } | |
1508 | } | |
1509 | else | |
1510 | { | |
1511 | DEBUG(D_transport) | |
1512 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
1513 | } | |
1514 | ||
1515 | if (!esmtp) | |
1516 | { | |
1517 | if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0) | |
1518 | goto SEND_FAILED; | |
1519 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1520 | ob->command_timeout)) goto RESPONSE_FAILED; | |
1521 | } | |
1522 | ||
f1513293 PH |
1523 | /* Set IGNOREQUOTA if the response to LHLO specifies support and the |
1524 | lmtp_ignore_quota option was set. */ | |
1525 | ||
1526 | igquotstr = (lmtp && ob->lmtp_ignore_quota && | |
1527 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1528 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; | |
1529 | ||
0756eb3c PH |
1530 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ |
1531 | ||
a7538db1 | 1532 | #ifdef SUPPORT_TLS |
0756eb3c PH |
1533 | tls_offered = esmtp && |
1534 | pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0, | |
1535 | PCRE_EOPT, NULL, 0) >= 0; | |
a7538db1 | 1536 | #endif |
fd98a5c6 | 1537 | |
a7538db1 | 1538 | #ifndef DISABLE_PRDR |
5130845b JH |
1539 | prdr_offered = esmtp |
1540 | && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0, | |
1541 | PCRE_EOPT, NULL, 0) >= 0 | |
1542 | && verify_check_given_host(&ob->hosts_try_prdr, host) == OK; | |
fd98a5c6 JH |
1543 | |
1544 | if (prdr_offered) | |
1545 | {DEBUG(D_transport) debug_printf("PRDR usable\n");} | |
a7538db1 | 1546 | #endif |
0756eb3c PH |
1547 | } |
1548 | ||
1549 | /* For continuing deliveries down the same channel, the socket is the standard | |
1550 | input, and we don't need to redo EHLO here (but may need to do so for TLS - see | |
1551 | below). Set up the pointer to where subsequent commands will be left, for | |
1552 | error messages. Note that smtp_use_size and smtp_use_pipelining will have been | |
1553 | set from the command line if they were set in the process that passed the | |
1554 | connection on. */ | |
1555 | ||
1556 | else | |
1557 | { | |
1558 | inblock.sock = outblock.sock = fileno(stdin); | |
1559 | smtp_command = big_buffer; | |
4311097e | 1560 | host->port = port; /* Record the port that was used */ |
0756eb3c PH |
1561 | } |
1562 | ||
1563 | /* If TLS is available on this connection, whether continued or not, attempt to | |
1564 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, | |
1565 | send another EHLO - the server may give a different answer in secure mode. We | |
1566 | use a separate buffer for reading the response to STARTTLS so that if it is | |
1567 | negative, the original EHLO data is available for subsequent analysis, should | |
1568 | the client not be required to use TLS. If the response is bad, copy the buffer | |
1569 | for error analysis. */ | |
1570 | ||
1571 | #ifdef SUPPORT_TLS | |
5130845b JH |
1572 | if ( tls_offered |
1573 | && !suppress_tls | |
1574 | && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK) | |
0756eb3c PH |
1575 | { |
1576 | uschar buffer2[4096]; | |
1577 | if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0) | |
1578 | goto SEND_FAILED; | |
1579 | ||
1580 | /* If there is an I/O error, transmission of this message is deferred. If | |
1581 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is | |
1582 | false, we also defer. However, if there is a temporary rejection of STARTTLS | |
1583 | and tls_tempfail_tryclear is true, or if there is an outright rejection of | |
1584 | STARTTLS, we carry on. This means we will try to send the message in clear, | |
1585 | unless the host is in hosts_require_tls (tested below). */ | |
1586 | ||
1587 | if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2', | |
1588 | ob->command_timeout)) | |
1589 | { | |
0756eb3c PH |
1590 | if (errno != 0 || buffer2[0] == 0 || |
1591 | (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)) | |
0dda4340 TK |
1592 | { |
1593 | Ustrncpy(buffer, buffer2, sizeof(buffer)); | |
0756eb3c | 1594 | goto RESPONSE_FAILED; |
0dda4340 | 1595 | } |
0756eb3c PH |
1596 | } |
1597 | ||
1598 | /* STARTTLS accepted: try to negotiate a TLS session. */ | |
1599 | ||
1600 | else | |
061b7ebd | 1601 | TLS_NEGOTIATE: |
0756eb3c | 1602 | { |
0e66b3b6 JH |
1603 | int rc = tls_client_start(inblock.sock, host, addrlist, tblock |
1604 | # ifdef EXPERIMENTAL_DANE | |
1605 | , dane ? &tlsa_dnsa : NULL | |
1606 | # endif | |
1607 | ); | |
0756eb3c PH |
1608 | |
1609 | /* TLS negotiation failed; give an error. From outside, this function may | |
1610 | be called again to try in clear on a new connection, if the options permit | |
1611 | it for this host. */ | |
1612 | ||
1613 | if (rc != OK) | |
1614 | { | |
1615 | save_errno = ERRNO_TLSFAILURE; | |
1616 | message = US"failure while setting up TLS session"; | |
1617 | send_quit = FALSE; | |
1618 | goto TLS_FAILED; | |
1619 | } | |
1620 | ||
1621 | /* TLS session is set up */ | |
1622 | ||
1623 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
5ca2a9a1 PH |
1624 | if (addr->transport_return == PENDING_DEFER) |
1625 | { | |
817d9f57 | 1626 | addr->cipher = tls_out.cipher; |
9d1c15ef JH |
1627 | addr->ourcert = tls_out.ourcert; |
1628 | addr->peercert = tls_out.peercert; | |
817d9f57 | 1629 | addr->peerdn = tls_out.peerdn; |
018058b2 | 1630 | addr->ocsp = tls_out.ocsp; |
5ca2a9a1 | 1631 | } |
0756eb3c PH |
1632 | } |
1633 | } | |
1634 | ||
061b7ebd PP |
1635 | /* if smtps, we'll have smtp_command set to something else; always safe to |
1636 | reset it here. */ | |
1637 | smtp_command = big_buffer; | |
1638 | ||
41c7c167 PH |
1639 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If |
1640 | helo_data is null, we are dealing with a connection that was passed from | |
1641 | another process, and so we won't have expanded helo_data above. We have to | |
1642 | expand it here. $sending_ip_address and $sending_port are set up right at the | |
1643 | start of the Exim process (in exim.c). */ | |
0756eb3c | 1644 | |
817d9f57 | 1645 | if (tls_out.active >= 0) |
0756eb3c | 1646 | { |
061b7ebd | 1647 | char *greeting_cmd; |
41c7c167 PH |
1648 | if (helo_data == NULL) |
1649 | { | |
1650 | helo_data = expand_string(ob->helo_data); | |
1651 | if (helo_data == NULL) | |
1652 | { | |
1653 | uschar *message = string_sprintf("failed to expand helo_data: %s", | |
1654 | expand_string_message); | |
c562fd30 | 1655 | set_errno(addrlist, 0, message, DEFER, FALSE, NULL); |
41c7c167 PH |
1656 | yield = DEFER; |
1657 | goto SEND_QUIT; | |
1658 | } | |
1659 | } | |
1660 | ||
0d0e4455 | 1661 | /* For SMTPS we need to wait for the initial OK response. */ |
061b7ebd PP |
1662 | if (smtps) |
1663 | { | |
1664 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1665 | ob->command_timeout)) goto RESPONSE_FAILED; | |
0d0e4455 PP |
1666 | } |
1667 | ||
1668 | if (esmtp) | |
1669 | greeting_cmd = "EHLO"; | |
1670 | else | |
1671 | { | |
1672 | greeting_cmd = "HELO"; | |
1673 | DEBUG(D_transport) | |
1674 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
061b7ebd PP |
1675 | } |
1676 | ||
1677 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", | |
1678 | lmtp? "LHLO" : greeting_cmd, helo_data) < 0) | |
0756eb3c PH |
1679 | goto SEND_FAILED; |
1680 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1681 | ob->command_timeout)) | |
1682 | goto RESPONSE_FAILED; | |
1683 | } | |
1684 | ||
1685 | /* If the host is required to use a secure channel, ensure that we | |
1686 | have one. */ | |
1687 | ||
0e66b3b6 JH |
1688 | else if ( |
1689 | # ifdef EXPERIMENTAL_DANE | |
1690 | dane || | |
1691 | # endif | |
5130845b | 1692 | verify_check_given_host(&ob->hosts_require_tls, host) == OK |
7a31d643 | 1693 | ) |
0756eb3c PH |
1694 | { |
1695 | save_errno = ERRNO_TLSREQUIRED; | |
c562fd30 | 1696 | message = string_sprintf("a TLS session is required, but %s", |
0756eb3c PH |
1697 | tls_offered? "an attempt to start TLS failed" : |
1698 | "the server did not offer TLS support"); | |
1699 | goto TLS_FAILED; | |
1700 | } | |
0e66b3b6 | 1701 | #endif /*SUPPORT_TLS*/ |
0756eb3c PH |
1702 | |
1703 | /* If TLS is active, we have just started it up and re-done the EHLO command, | |
1704 | so its response needs to be analyzed. If TLS is not active and this is a | |
1705 | continued session down a previously-used socket, we haven't just done EHLO, so | |
1706 | we skip this. */ | |
1707 | ||
1708 | if (continue_hostname == NULL | |
a7538db1 | 1709 | #ifdef SUPPORT_TLS |
817d9f57 | 1710 | || tls_out.active >= 0 |
a7538db1 | 1711 | #endif |
0756eb3c PH |
1712 | ) |
1713 | { | |
f1513293 PH |
1714 | /* Set for IGNOREQUOTA if the response to LHLO specifies support and the |
1715 | lmtp_ignore_quota option was set. */ | |
1716 | ||
1717 | igquotstr = (lmtp && ob->lmtp_ignore_quota && | |
1718 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1719 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; | |
1720 | ||
0756eb3c PH |
1721 | /* If the response to EHLO specified support for the SIZE parameter, note |
1722 | this, provided size_addition is non-negative. */ | |
1723 | ||
1724 | smtp_use_size = esmtp && ob->size_addition >= 0 && | |
1725 | pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1726 | PCRE_EOPT, NULL, 0) >= 0; | |
1727 | ||
1728 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched | |
c51b8e75 PH |
1729 | the current host, esmtp will be false, so PIPELINING can never be used. If |
1730 | the current host matches hosts_avoid_pipelining, don't do it. */ | |
0756eb3c | 1731 | |
5130845b JH |
1732 | smtp_use_pipelining = esmtp |
1733 | && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK | |
1734 | && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1735 | PCRE_EOPT, NULL, 0) >= 0; | |
0756eb3c PH |
1736 | |
1737 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", | |
1738 | smtp_use_pipelining? "" : "not "); | |
1739 | ||
8ccd00b1 | 1740 | #ifndef DISABLE_PRDR |
5130845b JH |
1741 | prdr_offered = esmtp |
1742 | && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1743 | PCRE_EOPT, NULL, 0) >= 0 | |
1744 | && verify_check_given_host(&ob->hosts_try_prdr, host) == OK; | |
fd98a5c6 JH |
1745 | |
1746 | if (prdr_offered) | |
1747 | {DEBUG(D_transport) debug_printf("PRDR usable\n");} | |
1748 | #endif | |
1749 | ||
6c1c3d1d WB |
1750 | #ifdef EXPERIMENTAL_DSN |
1751 | /* Note if the server supports DSN */ | |
1752 | smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0, | |
1753 | PCRE_EOPT, NULL, 0) >= 0; | |
1754 | DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn); | |
1755 | #endif | |
1756 | ||
0756eb3c PH |
1757 | /* Note if the response to EHLO specifies support for the AUTH extension. |
1758 | If it has, check that this host is one we want to authenticate to, and do | |
1759 | the business. The host name and address must be available when the | |
1760 | authenticator's client driver is running. */ | |
1761 | ||
fcc8e047 JH |
1762 | switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host, |
1763 | ob, esmtp, &inblock, &outblock)) | |
0756eb3c | 1764 | { |
fcc8e047 JH |
1765 | default: goto SEND_QUIT; |
1766 | case OK: break; | |
1767 | case FAIL_SEND: goto SEND_FAILED; | |
1768 | case FAIL: goto RESPONSE_FAILED; | |
0756eb3c PH |
1769 | } |
1770 | } | |
1771 | ||
1772 | /* The setting up of the SMTP call is now complete. Any subsequent errors are | |
1773 | message-specific. */ | |
1774 | ||
1775 | setting_up = FALSE; | |
1776 | ||
1777 | /* If there is a filter command specified for this transport, we can now | |
1778 | set it up. This cannot be done until the identify of the host is known. */ | |
1779 | ||
1780 | if (tblock->filter_command != NULL) | |
1781 | { | |
1782 | BOOL rc; | |
1783 | uschar buffer[64]; | |
1784 | sprintf(CS buffer, "%.50s transport", tblock->name); | |
1785 | rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command, | |
1786 | TRUE, DEFER, addrlist, buffer, NULL); | |
9b989985 | 1787 | transport_filter_timeout = tblock->filter_timeout; |
0756eb3c PH |
1788 | |
1789 | /* On failure, copy the error to all addresses, abandon the SMTP call, and | |
1790 | yield ERROR. */ | |
1791 | ||
1792 | if (!rc) | |
1793 | { | |
447d236c | 1794 | set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER, |
c562fd30 | 1795 | FALSE, NULL); |
0756eb3c PH |
1796 | yield = ERROR; |
1797 | goto SEND_QUIT; | |
1798 | } | |
1799 | } | |
1800 | ||
1801 | ||
1802 | /* For messages that have more than the maximum number of envelope recipients, | |
1803 | we want to send several transactions down the same SMTP connection. (See | |
1804 | comments in deliver.c as to how this reconciles, heuristically, with | |
1805 | remote_max_parallel.) This optimization was added to Exim after the following | |
1806 | code was already working. The simplest way to put it in without disturbing the | |
1807 | code was to use a goto to jump back to this point when there is another | |
1808 | transaction to handle. */ | |
1809 | ||
1810 | SEND_MESSAGE: | |
1811 | sync_addr = first_addr; | |
1812 | address_count = 0; | |
1813 | ok = FALSE; | |
1814 | send_rset = TRUE; | |
1815 | completed_address = FALSE; | |
1816 | ||
1817 | ||
1818 | /* Initiate a message transfer. If we know the receiving MTA supports the SIZE | |
1819 | qualification, send it, adding something to the message size to allow for | |
1820 | imprecision and things that get added en route. Exim keeps the number of lines | |
1821 | in a message, so we can give an accurate value for the original message, but we | |
1822 | need some additional to handle added headers. (Double "." characters don't get | |
1823 | included in the count.) */ | |
1824 | ||
1825 | p = buffer; | |
1826 | *p = 0; | |
1827 | ||
1828 | if (smtp_use_size) | |
1829 | { | |
1830 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition); | |
1831 | while (*p) p++; | |
1832 | } | |
1833 | ||
8ccd00b1 | 1834 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
1835 | prdr_active = FALSE; |
1836 | if (prdr_offered) | |
1837 | { | |
1838 | for (addr = first_addr; addr; addr = addr->next) | |
1839 | if (addr->transport_return == PENDING_DEFER) | |
1840 | { | |
1841 | for (addr = addr->next; addr; addr = addr->next) | |
1842 | if (addr->transport_return == PENDING_DEFER) | |
1843 | { /* at least two recipients to send */ | |
1844 | prdr_active = TRUE; | |
1845 | sprintf(CS p, " PRDR"); p += 5; | |
a7538db1 | 1846 | break; |
fd98a5c6 JH |
1847 | } |
1848 | break; | |
1849 | } | |
1850 | } | |
fd98a5c6 JH |
1851 | #endif |
1852 | ||
6c1c3d1d WB |
1853 | #ifdef EXPERIMENTAL_DSN |
1854 | /* check if all addresses have lasthop flag */ | |
1855 | /* do not send RET and ENVID if true */ | |
1856 | dsn_all_lasthop = TRUE; | |
1857 | for (addr = first_addr; | |
1858 | address_count < max_rcpt && addr != NULL; | |
1859 | addr = addr->next) | |
1860 | if ((addr->dsn_flags & rf_dsnlasthop) != 1) | |
1861 | dsn_all_lasthop = FALSE; | |
1862 | ||
1863 | /* Add any DSN flags to the mail command */ | |
1864 | ||
1865 | if ((smtp_use_dsn) && (dsn_all_lasthop == FALSE)) | |
1866 | { | |
1867 | if (dsn_ret == dsn_ret_hdrs) | |
1868 | { | |
45500060 | 1869 | Ustrcpy(p, " RET=HDRS"); |
6c1c3d1d WB |
1870 | while (*p) p++; |
1871 | } | |
1872 | else if (dsn_ret == dsn_ret_full) | |
1873 | { | |
45500060 | 1874 | Ustrcpy(p, " RET=FULL"); |
6c1c3d1d WB |
1875 | while (*p) p++; |
1876 | } | |
1877 | if (dsn_envid != NULL) | |
1878 | { | |
1879 | string_format(p, sizeof(buffer) - (p-buffer), " ENVID=%s", dsn_envid); | |
1880 | while (*p) p++; | |
1881 | } | |
1882 | } | |
1883 | #endif | |
1884 | ||
6b62e899 JH |
1885 | /* If an authenticated_sender override has been specified for this transport |
1886 | instance, expand it. If the expansion is forced to fail, and there was already | |
1887 | an authenticated_sender for this message, the original value will be used. | |
1888 | Other expansion failures are serious. An empty result is ignored, but there is | |
1889 | otherwise no check - this feature is expected to be used with LMTP and other | |
1890 | cases where non-standard addresses (e.g. without domains) might be required. */ | |
1891 | ||
fcc8e047 | 1892 | if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob)) |
a7538db1 JH |
1893 | { |
1894 | yield = ERROR; | |
1895 | goto SEND_QUIT; | |
1896 | } | |
0756eb3c PH |
1897 | |
1898 | /* From here until we send the DATA command, we can make use of PIPELINING | |
1899 | if the server host supports it. The code has to be able to check the responses | |
1900 | at any point, for when the buffer fills up, so we write it totally generally. | |
1901 | When PIPELINING is off, each command written reports that it has flushed the | |
1902 | buffer. */ | |
1903 | ||
1904 | pending_MAIL = TRUE; /* The block starts with MAIL */ | |
1905 | ||
1906 | rc = smtp_write_command(&outblock, smtp_use_pipelining, | |
1907 | "MAIL FROM:<%s>%s\r\n", return_path, buffer); | |
1908 | mail_command = string_copy(big_buffer); /* Save for later error message */ | |
1909 | ||
1910 | switch(rc) | |
1911 | { | |
1912 | case -1: /* Transmission error */ | |
1913 | goto SEND_FAILED; | |
1914 | ||
1915 | case +1: /* Block was sent */ | |
1916 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
e97957bc PH |
1917 | ob->command_timeout)) |
1918 | { | |
1919 | if (errno == 0 && buffer[0] == '4') | |
1920 | { | |
1921 | errno = ERRNO_MAIL4XX; | |
1922 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
1923 | } | |
1924 | goto RESPONSE_FAILED; | |
1925 | } | |
0756eb3c PH |
1926 | pending_MAIL = FALSE; |
1927 | break; | |
1928 | } | |
1929 | ||
1930 | /* Pass over all the relevant recipient addresses for this host, which are the | |
1931 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send | |
1932 | several before we have to read the responses for those seen so far. This | |
1933 | checking is done by a subroutine because it also needs to be done at the end. | |
1934 | Send only up to max_rcpt addresses at a time, leaving first_addr pointing to | |
1935 | the next one if not all are sent. | |
1936 | ||
1937 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the | |
1938 | last address because we want to abort if any recipients have any kind of | |
1939 | problem, temporary or permanent. We know that all recipient addresses will have | |
1940 | the PENDING_DEFER status, because only one attempt is ever made, and we know | |
1941 | that max_rcpt will be large, so all addresses will be done at once. */ | |
1942 | ||
1943 | for (addr = first_addr; | |
1944 | address_count < max_rcpt && addr != NULL; | |
1945 | addr = addr->next) | |
1946 | { | |
1947 | int count; | |
1948 | BOOL no_flush; | |
1949 | ||
a7538db1 JH |
1950 | #ifdef EXPERIMENTAL_DSN |
1951 | addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no; | |
1952 | #endif | |
6c1c3d1d | 1953 | |
0756eb3c PH |
1954 | if (addr->transport_return != PENDING_DEFER) continue; |
1955 | ||
1956 | address_count++; | |
1957 | no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL); | |
1958 | ||
a7538db1 | 1959 | #ifdef EXPERIMENTAL_DSN |
6c1c3d1d WB |
1960 | /* Add any DSN flags to the rcpt command and add to the sent string */ |
1961 | ||
1962 | p = buffer; | |
1963 | *p = 0; | |
1964 | ||
a7538db1 | 1965 | if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1) |
6c1c3d1d WB |
1966 | { |
1967 | if ((addr->dsn_flags & rf_dsnflags) != 0) | |
1968 | { | |
1969 | int i; | |
1970 | BOOL first = TRUE; | |
45500060 | 1971 | Ustrcpy(p, " NOTIFY="); |
6c1c3d1d WB |
1972 | while (*p) p++; |
1973 | for (i = 0; i < 4; i++) | |
6c1c3d1d WB |
1974 | if ((addr->dsn_flags & rf_list[i]) != 0) |
1975 | { | |
1976 | if (!first) *p++ = ','; | |
1977 | first = FALSE; | |
45500060 | 1978 | Ustrcpy(p, rf_names[i]); |
6c1c3d1d WB |
1979 | while (*p) p++; |
1980 | } | |
6c1c3d1d WB |
1981 | } |
1982 | ||
a7538db1 JH |
1983 | if (addr->dsn_orcpt != NULL) |
1984 | { | |
6c1c3d1d WB |
1985 | string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s", |
1986 | addr->dsn_orcpt); | |
1987 | while (*p) p++; | |
1988 | } | |
1989 | } | |
a7538db1 | 1990 | #endif |
6c1c3d1d WB |
1991 | |
1992 | ||
0756eb3c PH |
1993 | /* Now send the RCPT command, and process outstanding responses when |
1994 | necessary. After a timeout on RCPT, we just end the function, leaving the | |
1995 | yield as OK, because this error can often mean that there is a problem with | |
1996 | just one address, so we don't want to delay the host. */ | |
1997 | ||
a7538db1 | 1998 | #ifdef EXPERIMENTAL_DSN |
6c1c3d1d WB |
1999 | count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n", |
2000 | transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer); | |
a7538db1 | 2001 | #else |
f1513293 PH |
2002 | count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n", |
2003 | transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr); | |
a7538db1 | 2004 | #endif |
6c1c3d1d | 2005 | |
0756eb3c PH |
2006 | if (count < 0) goto SEND_FAILED; |
2007 | if (count > 0) | |
2008 | { | |
2009 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, | |
48c7f9e2 PH |
2010 | &sync_addr, host, count, ob->address_retry_include_sender, |
2011 | pending_MAIL, 0, &inblock, ob->command_timeout, buffer, | |
2012 | sizeof(buffer))) | |
0756eb3c PH |
2013 | { |
2014 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
2015 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
2016 | break; | |
2017 | ||
2018 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
2019 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
2020 | case 0: /* No 2xx or 5xx, but no probs */ | |
2021 | break; | |
2022 | ||
2023 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
2024 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */ | |
2025 | } | |
2026 | pending_MAIL = FALSE; /* Dealt with MAIL */ | |
2027 | } | |
2028 | } /* Loop for next address */ | |
2029 | ||
2030 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either | |
2031 | permanently or temporarily. We should have flushed and synced after the last | |
2032 | RCPT. */ | |
2033 | ||
2034 | if (mua_wrapper) | |
2035 | { | |
2036 | address_item *badaddr; | |
2037 | for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next) | |
2038 | { | |
2039 | if (badaddr->transport_return != PENDING_OK) break; | |
2040 | } | |
2041 | if (badaddr != NULL) | |
2042 | { | |
447d236c | 2043 | set_errno(addrlist, 0, badaddr->message, FAIL, |
c562fd30 | 2044 | testflag(badaddr, af_pass_message), NULL); |
0756eb3c PH |
2045 | ok = FALSE; |
2046 | } | |
2047 | } | |
2048 | ||
2049 | /* If ok is TRUE, we know we have got at least one good recipient, and must now | |
2050 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still | |
2051 | have a good recipient buffered up if we are pipelining. We don't want to waste | |
2052 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we | |
2053 | are pipelining. The responses are all handled by sync_responses(). */ | |
2054 | ||
2055 | if (ok || (smtp_use_pipelining && !mua_wrapper)) | |
2056 | { | |
2057 | int count = smtp_write_command(&outblock, FALSE, "DATA\r\n"); | |
2058 | if (count < 0) goto SEND_FAILED; | |
2059 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr, | |
48c7f9e2 PH |
2060 | host, count, ob->address_retry_include_sender, pending_MAIL, |
2061 | ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer))) | |
0756eb3c PH |
2062 | { |
2063 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
2064 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
2065 | break; | |
2066 | ||
2067 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
2068 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
2069 | case 0: break; /* No 2xx or 5xx, but no probs */ | |
2070 | ||
2071 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
2072 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ | |
2073 | } | |
2074 | } | |
2075 | ||
2076 | /* Save the first address of the next batch. */ | |
2077 | ||
2078 | first_addr = addr; | |
2079 | ||
2080 | /* If there were no good recipients (but otherwise there have been no | |
2081 | problems), just set ok TRUE, since we have handled address-specific errors | |
2082 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism | |
2083 | for handling the SMTP dot-handling protocol, flagging to apply to headers as | |
2084 | well as body. Set the appropriate timeout value to be used for each chunk. | |
2085 | (Haven't been able to make it work using select() for writing yet.) */ | |
2086 | ||
2087 | if (!ok) ok = TRUE; else | |
2088 | { | |
2089 | sigalrm_seen = FALSE; | |
2090 | transport_write_timeout = ob->data_timeout; | |
2091 | smtp_command = US"sending data block"; /* For error messages */ | |
2092 | DEBUG(D_transport|D_v) | |
2093 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); | |
2094 | transport_count = 0; | |
a7538db1 | 2095 | |
80a47a2c | 2096 | #ifndef DISABLE_DKIM |
4cd12fe9 TK |
2097 | ok = dkim_transport_write_message(addrlist, inblock.sock, |
2098 | topt_use_crlf | topt_end_dot | topt_escape_headers | | |
2099 | (tblock->body_only? topt_no_headers : 0) | | |
2100 | (tblock->headers_only? topt_no_body : 0) | | |
2101 | (tblock->return_path_add? topt_add_return_path : 0) | | |
2102 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
2103 | (tblock->envelope_to_add? topt_add_envelope_to : 0), | |
2104 | 0, /* No size limit */ | |
2105 | tblock->add_headers, tblock->remove_headers, | |
2106 | US".", US"..", /* Escaping strings */ | |
2107 | tblock->rewrite_rules, tblock->rewrite_existflags, | |
2108 | ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector, | |
80a47a2c | 2109 | ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers |
4cd12fe9 TK |
2110 | ); |
2111 | #else | |
0756eb3c PH |
2112 | ok = transport_write_message(addrlist, inblock.sock, |
2113 | topt_use_crlf | topt_end_dot | topt_escape_headers | | |
2114 | (tblock->body_only? topt_no_headers : 0) | | |
2115 | (tblock->headers_only? topt_no_body : 0) | | |
2116 | (tblock->return_path_add? topt_add_return_path : 0) | | |
2117 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
2118 | (tblock->envelope_to_add? topt_add_envelope_to : 0), | |
2119 | 0, /* No size limit */ | |
2120 | tblock->add_headers, tblock->remove_headers, | |
2121 | US".", US"..", /* Escaping strings */ | |
2122 | tblock->rewrite_rules, tblock->rewrite_existflags); | |
4cd12fe9 | 2123 | #endif |
0756eb3c PH |
2124 | |
2125 | /* transport_write_message() uses write() because it is called from other | |
2126 | places to write to non-sockets. This means that under some OS (e.g. Solaris) | |
2127 | it can exit with "Broken pipe" as its error. This really means that the | |
2128 | socket got closed at the far end. */ | |
2129 | ||
2130 | transport_write_timeout = 0; /* for subsequent transports */ | |
2131 | ||
2132 | /* Failure can either be some kind of I/O disaster (including timeout), | |
2133 | or the failure of a transport filter or the expansion of added headers. */ | |
2134 | ||
2135 | if (!ok) | |
2136 | { | |
2137 | buffer[0] = 0; /* There hasn't been a response */ | |
2138 | goto RESPONSE_FAILED; | |
2139 | } | |
2140 | ||
2141 | /* We used to send the terminating "." explicitly here, but because of | |
2142 | buffering effects at both ends of TCP/IP connections, you don't gain | |
2143 | anything by keeping it separate, so it might as well go in the final | |
2144 | data buffer for efficiency. This is now done by setting the topt_end_dot | |
2145 | flag above. */ | |
2146 | ||
2147 | smtp_command = US"end of data"; | |
2148 | ||
8ccd00b1 | 2149 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2150 | /* For PRDR we optionally get a partial-responses warning |
2151 | * followed by the individual responses, before going on with | |
2152 | * the overall response. If we don't get the warning then deal | |
2153 | * with per non-PRDR. */ | |
2154 | if(prdr_active) | |
2155 | { | |
2156 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3', | |
2157 | ob->final_timeout); | |
2158 | if (!ok && errno == 0) | |
2159 | switch(buffer[0]) | |
2160 | { | |
2161 | case '2': prdr_active = FALSE; | |
2162 | ok = TRUE; | |
2163 | break; | |
2164 | case '4': errno = ERRNO_DATA4XX; | |
2165 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
2166 | break; | |
2167 | } | |
2168 | } | |
2169 | else | |
2170 | #endif | |
2171 | ||
2172 | /* For non-PRDR SMTP, we now read a single response that applies to the | |
2173 | whole message. If it is OK, then all the addresses have been delivered. */ | |
0756eb3c | 2174 | |
e97957bc PH |
2175 | if (!lmtp) |
2176 | { | |
2177 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2178 | ob->final_timeout); | |
2179 | if (!ok && errno == 0 && buffer[0] == '4') | |
2180 | { | |
2181 | errno = ERRNO_DATA4XX; | |
2182 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
2183 | } | |
2184 | } | |
0756eb3c PH |
2185 | |
2186 | /* For LMTP, we get back a response for every RCPT command that we sent; | |
2187 | some may be accepted and some rejected. For those that get a response, their | |
2188 | status is fixed; any that are accepted have been handed over, even if later | |
2189 | responses crash - at least, that's how I read RFC 2033. | |
2190 | ||
2191 | If all went well, mark the recipient addresses as completed, record which | |
2192 | host/IPaddress they were delivered to, and cut out RSET when sending another | |
2193 | message down the same channel. Write the completed addresses to the journal | |
2194 | now so that they are recorded in case there is a crash of hardware or | |
2195 | software before the spool gets updated. Also record the final SMTP | |
2196 | confirmation if needed (for SMTP only). */ | |
2197 | ||
2198 | if (ok) | |
2199 | { | |
2200 | int flag = '='; | |
2201 | int delivery_time = (int)(time(NULL) - start_delivery_time); | |
2202 | int len; | |
0756eb3c PH |
2203 | uschar *conf = NULL; |
2204 | send_rset = FALSE; | |
2205 | ||
0756eb3c PH |
2206 | /* Set up confirmation if needed - applies only to SMTP */ |
2207 | ||
d68218c7 | 2208 | if ( |
774ef2d7 | 2209 | #ifndef EXPERIMENTAL_EVENT |
d68218c7 | 2210 | (log_extra_selector & LX_smtp_confirmation) != 0 && |
a7538db1 | 2211 | #endif |
d68218c7 JH |
2212 | !lmtp |
2213 | ) | |
0756eb3c PH |
2214 | { |
2215 | uschar *s = string_printing(buffer); | |
2216 | conf = (s == buffer)? (uschar *)string_copy(s) : s; | |
2217 | } | |
2218 | ||
fd98a5c6 | 2219 | /* Process all transported addresses - for LMTP or PRDR, read a status for |
0756eb3c PH |
2220 | each one. */ |
2221 | ||
2222 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
2223 | { | |
2224 | if (addr->transport_return != PENDING_OK) continue; | |
2225 | ||
2226 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the | |
2227 | remaining addresses. Otherwise, it's a return code for just the one | |
75def545 PH |
2228 | address. For temporary errors, add a retry item for the address so that |
2229 | it doesn't get tried again too soon. */ | |
0756eb3c | 2230 | |
8ccd00b1 | 2231 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2232 | if (lmtp || prdr_active) |
2233 | #else | |
0756eb3c | 2234 | if (lmtp) |
fd98a5c6 | 2235 | #endif |
0756eb3c PH |
2236 | { |
2237 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2238 | ob->final_timeout)) | |
2239 | { | |
2240 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; | |
fd98a5c6 | 2241 | addr->message = string_sprintf( |
8ccd00b1 | 2242 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2243 | "%s error after %s: %s", prdr_active ? "PRDR":"LMTP", |
2244 | #else | |
2245 | "LMTP error after %s: %s", | |
2246 | #endif | |
0756eb3c | 2247 | big_buffer, string_printing(buffer)); |
75def545 PH |
2248 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
2249 | if (buffer[0] == '5') | |
2250 | addr->transport_return = FAIL; | |
2251 | else | |
2252 | { | |
e97957bc PH |
2253 | errno = ERRNO_DATA4XX; |
2254 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
75def545 | 2255 | addr->transport_return = DEFER; |
8ccd00b1 | 2256 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2257 | if (!prdr_active) |
2258 | #endif | |
2259 | retry_add_item(addr, addr->address_retry_key, 0); | |
75def545 | 2260 | } |
0756eb3c PH |
2261 | continue; |
2262 | } | |
2263 | completed_address = TRUE; /* NOW we can set this flag */ | |
c0ea85ab TF |
2264 | if ((log_extra_selector & LX_smtp_confirmation) != 0) |
2265 | { | |
2266 | uschar *s = string_printing(buffer); | |
2267 | conf = (s == buffer)? (uschar *)string_copy(s) : s; | |
2268 | } | |
0756eb3c PH |
2269 | } |
2270 | ||
2271 | /* SMTP, or success return from LMTP for this address. Pass back the | |
2d280592 | 2272 | actual host that was used. */ |
0756eb3c PH |
2273 | |
2274 | addr->transport_return = OK; | |
2275 | addr->more_errno = delivery_time; | |
d427a7f9 | 2276 | addr->host_used = host; |
0756eb3c PH |
2277 | addr->special_action = flag; |
2278 | addr->message = conf; | |
8ccd00b1 | 2279 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2280 | if (prdr_active) addr->flags |= af_prdr_used; |
2281 | #endif | |
0756eb3c PH |
2282 | flag = '-'; |
2283 | ||
8ccd00b1 | 2284 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2285 | if (!prdr_active) |
2286 | #endif | |
2287 | { | |
2288 | /* Update the journal. For homonymic addresses, use the base address plus | |
2289 | the transport name. See lots of comments in deliver.c about the reasons | |
2290 | for the complications when homonyms are involved. Just carry on after | |
2291 | write error, as it may prove possible to update the spool file later. */ | |
4d8d62b9 | 2292 | |
fd98a5c6 JH |
2293 | if (testflag(addr, af_homonym)) |
2294 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); | |
2295 | else | |
2296 | sprintf(CS buffer, "%.500s\n", addr->unique); | |
4d8d62b9 | 2297 | |
fd98a5c6 JH |
2298 | DEBUG(D_deliver) debug_printf("journalling %s", buffer); |
2299 | len = Ustrlen(CS buffer); | |
2300 | if (write(journal_fd, buffer, len) != len) | |
2301 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " | |
2302 | "%s: %s", buffer, strerror(errno)); | |
2303 | } | |
0756eb3c PH |
2304 | } |
2305 | ||
8ccd00b1 | 2306 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2307 | if (prdr_active) |
2308 | { | |
2309 | /* PRDR - get the final, overall response. For any non-success | |
2310 | upgrade all the address statuses. */ | |
2311 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2312 | ob->final_timeout); | |
2313 | if (!ok) | |
2314 | { | |
2315 | if(errno == 0 && buffer[0] == '4') | |
2316 | { | |
2317 | errno = ERRNO_DATA4XX; | |
2318 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
2319 | } | |
2320 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
2321 | if (buffer[0] == '5' || addr->transport_return == OK) | |
2322 | addr->transport_return = PENDING_OK; /* allow set_errno action */ | |
2323 | goto RESPONSE_FAILED; | |
2324 | } | |
2325 | ||
2326 | /* Update the journal, or setup retry. */ | |
2327 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
2328 | if (addr->transport_return == OK) | |
2329 | { | |
2330 | if (testflag(addr, af_homonym)) | |
2331 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); | |
2332 | else | |
2333 | sprintf(CS buffer, "%.500s\n", addr->unique); | |
4d8d62b9 | 2334 | |
fd98a5c6 JH |
2335 | DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer); |
2336 | len = Ustrlen(CS buffer); | |
2337 | if (write(journal_fd, buffer, len) != len) | |
2338 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " | |
2339 | "%s: %s", buffer, strerror(errno)); | |
2340 | } | |
2341 | else if (addr->transport_return == DEFER) | |
2342 | retry_add_item(addr, addr->address_retry_key, -2); | |
2343 | } | |
2344 | #endif | |
2345 | ||
0756eb3c PH |
2346 | /* Ensure the journal file is pushed out to disk. */ |
2347 | ||
54fc8428 | 2348 | if (EXIMfsync(journal_fd) < 0) |
0756eb3c PH |
2349 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", |
2350 | strerror(errno)); | |
2351 | } | |
2352 | } | |
2353 | ||
2354 | ||
2355 | /* Handle general (not specific to one address) failures here. The value of ok | |
2356 | is used to skip over this code on the falling through case. A timeout causes a | |
2357 | deferral. Other errors may defer or fail according to the response code, and | |
2358 | may set up a special errno value, e.g. after connection chopped, which is | |
2359 | assumed if errno == 0 and there is no text in the buffer. If control reaches | |
2360 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as | |
2361 | the problem is not related to this specific message. */ | |
2362 | ||
2363 | if (!ok) | |
2364 | { | |
2365 | int code; | |
2366 | ||
2367 | RESPONSE_FAILED: | |
2368 | save_errno = errno; | |
2369 | message = NULL; | |
2370 | send_quit = check_response(host, &save_errno, addrlist->more_errno, | |
447d236c | 2371 | buffer, &code, &message, &pass_message); |
0756eb3c PH |
2372 | goto FAILED; |
2373 | ||
2374 | SEND_FAILED: | |
2375 | save_errno = errno; | |
2376 | code = '4'; | |
2377 | message = US string_sprintf("send() to %s [%s] failed: %s", | |
2378 | host->name, host->address, strerror(save_errno)); | |
2379 | send_quit = FALSE; | |
2380 | goto FAILED; | |
2381 | ||
2382 | /* This label is jumped to directly when a TLS negotiation has failed, | |
2383 | or was not done for a host for which it is required. Values will be set | |
2384 | in message and save_errno, and setting_up will always be true. Treat as | |
2385 | a temporary error. */ | |
2386 | ||
a7538db1 | 2387 | #ifdef SUPPORT_TLS |
0756eb3c PH |
2388 | TLS_FAILED: |
2389 | code = '4'; | |
a7538db1 | 2390 | #endif |
0756eb3c PH |
2391 | |
2392 | /* If the failure happened while setting up the call, see if the failure was | |
2393 | a 5xx response (this will either be on connection, or following HELO - a 5xx | |
2394 | after EHLO causes it to try HELO). If so, fail all addresses, as this host is | |
2395 | never going to accept them. For other errors during setting up (timeouts or | |
2396 | whatever), defer all addresses, and yield DEFER, so that the host is not | |
2397 | tried again for a while. */ | |
2398 | ||
2399 | FAILED: | |
2400 | ok = FALSE; /* For when reached by GOTO */ | |
2401 | ||
2402 | if (setting_up) | |
2403 | { | |
2404 | if (code == '5') | |
c562fd30 | 2405 | set_errno(addrlist, save_errno, message, FAIL, pass_message, host); |
0756eb3c PH |
2406 | else |
2407 | { | |
c562fd30 | 2408 | set_errno(addrlist, save_errno, message, DEFER, pass_message, host); |
0756eb3c PH |
2409 | yield = DEFER; |
2410 | } | |
2411 | } | |
2412 | ||
e97957bc | 2413 | /* We want to handle timeouts after MAIL or "." and loss of connection after |
0756eb3c | 2414 | "." specially. They can indicate a problem with the sender address or with |
e97957bc PH |
2415 | the contents of the message rather than a real error on the connection. These |
2416 | cases are treated in the same way as a 4xx response. This next bit of code | |
2417 | does the classification. */ | |
0756eb3c | 2418 | |
e97957bc | 2419 | else |
0756eb3c | 2420 | { |
e97957bc | 2421 | BOOL message_error; |
0756eb3c | 2422 | |
e97957bc PH |
2423 | switch(save_errno) |
2424 | { | |
2425 | case 0: | |
2426 | case ERRNO_MAIL4XX: | |
2427 | case ERRNO_DATA4XX: | |
2428 | message_error = TRUE; | |
2429 | break; | |
0756eb3c | 2430 | |
e97957bc PH |
2431 | case ETIMEDOUT: |
2432 | message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 || | |
2433 | Ustrncmp(smtp_command,"end ",4) == 0; | |
2434 | break; | |
2435 | ||
2436 | case ERRNO_SMTPCLOSED: | |
2437 | message_error = Ustrncmp(smtp_command,"end ",4) == 0; | |
2438 | break; | |
2439 | ||
2440 | default: | |
2441 | message_error = FALSE; | |
2442 | break; | |
2443 | } | |
0756eb3c | 2444 | |
e97957bc | 2445 | /* Handle the cases that are treated as message errors. These are: |
0756eb3c | 2446 | |
e97957bc PH |
2447 | (a) negative response or timeout after MAIL |
2448 | (b) negative response after DATA | |
2449 | (c) negative response or timeout or dropped connection after "." | |
0756eb3c | 2450 | |
e97957bc PH |
2451 | It won't be a negative response or timeout after RCPT, as that is dealt |
2452 | with separately above. The action in all cases is to set an appropriate | |
2453 | error code for all the addresses, but to leave yield set to OK because the | |
2454 | host itself has not failed. Of course, it might in practice have failed | |
2455 | when we've had a timeout, but if so, we'll discover that at the next | |
2456 | delivery attempt. For a temporary error, set the message_defer flag, and | |
2457 | write to the logs for information if this is not the last host. The error | |
2458 | for the last host will be logged as part of the address's log line. */ | |
2459 | ||
2460 | if (message_error) | |
0756eb3c | 2461 | { |
e97957bc PH |
2462 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ |
2463 | set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER, | |
c562fd30 | 2464 | pass_message, host); |
e97957bc PH |
2465 | |
2466 | /* If there's an errno, the message contains just the identity of | |
2467 | the host. */ | |
2468 | ||
2469 | if (code != '5') /* Anything other than 5 is treated as temporary */ | |
2470 | { | |
2471 | if (save_errno > 0) | |
2472 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); | |
2473 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message); | |
c562fd30 | 2474 | msglog_line(host, message); |
e97957bc PH |
2475 | *message_defer = TRUE; |
2476 | } | |
2477 | } | |
2478 | ||
2479 | /* Otherwise, we have an I/O error or a timeout other than after MAIL or | |
2480 | ".", or some other transportation error. We defer all addresses and yield | |
2481 | DEFER, except for the case of failed add_headers expansion, or a transport | |
2482 | filter failure, when the yield should be ERROR, to stop it trying other | |
2483 | hosts. */ | |
2484 | ||
2485 | else | |
2486 | { | |
2487 | yield = (save_errno == ERRNO_CHHEADER_FAIL || | |
2488 | save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER; | |
c562fd30 | 2489 | set_errno(addrlist, save_errno, message, DEFER, pass_message, host); |
0756eb3c PH |
2490 | } |
2491 | } | |
2492 | } | |
2493 | ||
2494 | ||
2495 | /* If all has gone well, send_quit will be set TRUE, implying we can end the | |
2496 | SMTP session tidily. However, if there were too many addresses to send in one | |
2497 | message (indicated by first_addr being non-NULL) we want to carry on with the | |
2498 | rest of them. Also, it is desirable to send more than one message down the SMTP | |
2499 | connection if there are several waiting, provided we haven't already sent so | |
2500 | many as to hit the configured limit. The function transport_check_waiting looks | |
2501 | for a waiting message and returns its id. Then transport_pass_socket tries to | |
2502 | set up a continued delivery by passing the socket on to another process. The | |
2503 | variable send_rset is FALSE if a message has just been successfully transfered. | |
2504 | ||
2505 | If we are already sending down a continued channel, there may be further | |
2506 | addresses not yet delivered that are aimed at the same host, but which have not | |
2507 | been passed in this run of the transport. In this case, continue_more will be | |
2508 | true, and all we should do is send RSET if necessary, and return, leaving the | |
2509 | channel open. | |
2510 | ||
2511 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we | |
2512 | do not want to continue with other messages down the same channel, because that | |
2513 | can lead to looping between two or more messages, all with the same, | |
2514 | temporarily failing address(es). [The retry information isn't updated yet, so | |
2515 | new processes keep on trying.] We probably also don't want to try more of this | |
2516 | message's addresses either. | |
2517 | ||
2518 | If we have started a TLS session, we have to end it before passing the | |
2519 | connection to a new process. However, not all servers can handle this (Exim | |
2520 | can), so we do not pass such a connection on if the host matches | |
2521 | hosts_nopass_tls. */ | |
2522 | ||
2523 | DEBUG(D_transport) | |
2524 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " | |
2525 | "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset, | |
2526 | continue_more, yield, (first_addr == NULL)? "":"not "); | |
2527 | ||
2528 | if (completed_address && ok && send_quit) | |
2529 | { | |
2530 | BOOL more; | |
5130845b JH |
2531 | if ( first_addr != NULL |
2532 | || continue_more | |
2533 | || ( ( tls_out.active < 0 | |
2534 | || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK | |
2535 | ) | |
0756eb3c PH |
2536 | && |
2537 | transport_check_waiting(tblock->name, host->name, | |
2538 | tblock->connection_max_messages, new_message_id, &more) | |
5130845b | 2539 | ) ) |
0756eb3c PH |
2540 | { |
2541 | uschar *msg; | |
447d236c | 2542 | BOOL pass_message; |
0756eb3c PH |
2543 | |
2544 | if (send_rset) | |
2545 | { | |
2546 | if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0)) | |
2547 | { | |
2548 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, | |
2549 | host->address, strerror(save_errno)); | |
2550 | send_quit = FALSE; | |
2551 | } | |
2552 | else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2553 | ob->command_timeout))) | |
2554 | { | |
2555 | int code; | |
447d236c PH |
2556 | send_quit = check_response(host, &errno, 0, buffer, &code, &msg, |
2557 | &pass_message); | |
0756eb3c PH |
2558 | if (!send_quit) |
2559 | { | |
c562fd30 JH |
2560 | DEBUG(D_transport) debug_printf("H=%s [%s] %s\n", |
2561 | host->name, host->address, msg); | |
0756eb3c PH |
2562 | } |
2563 | } | |
2564 | } | |
2565 | ||
2566 | /* Either RSET was not needed, or it succeeded */ | |
2567 | ||
2568 | if (ok) | |
2569 | { | |
2570 | if (first_addr != NULL) /* More addresses still to be sent */ | |
2571 | { /* in this run of the transport */ | |
2572 | continue_sequence++; /* Causes * in logging */ | |
2573 | goto SEND_MESSAGE; | |
2574 | } | |
2575 | if (continue_more) return yield; /* More addresses for another run */ | |
2576 | ||
2577 | /* Pass the socket to a new Exim process. Before doing so, we must shut | |
2578 | down TLS. Not all MTAs allow for the continuation of the SMTP session | |
2579 | when TLS is shut down. We test for this by sending a new EHLO. If we | |
2580 | don't get a good response, we don't attempt to pass the socket on. */ | |
2581 | ||
a7538db1 | 2582 | #ifdef SUPPORT_TLS |
817d9f57 | 2583 | if (tls_out.active >= 0) |
0756eb3c | 2584 | { |
817d9f57 | 2585 | tls_close(FALSE, TRUE); |
061b7ebd PP |
2586 | if (smtps) |
2587 | ok = FALSE; | |
2588 | else | |
2589 | ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 && | |
2590 | smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2591 | ob->command_timeout); | |
0756eb3c | 2592 | } |
a7538db1 | 2593 | #endif |
0756eb3c PH |
2594 | |
2595 | /* If the socket is successfully passed, we musn't send QUIT (or | |
2596 | indeed anything!) from here. */ | |
2597 | ||
2598 | if (ok && transport_pass_socket(tblock->name, host->name, host->address, | |
2599 | new_message_id, inblock.sock)) | |
2600 | { | |
2601 | send_quit = FALSE; | |
2602 | } | |
2603 | } | |
2604 | ||
2605 | /* If RSET failed and there are addresses left, they get deferred. */ | |
2606 | ||
c562fd30 | 2607 | else set_errno(first_addr, errno, msg, DEFER, FALSE, host); |
0756eb3c PH |
2608 | } |
2609 | } | |
2610 | ||
2611 | /* End off tidily with QUIT unless the connection has died or the socket has | |
2612 | been passed to another process. There has been discussion on the net about what | |
2613 | to do after sending QUIT. The wording of the RFC suggests that it is necessary | |
2614 | to wait for a response, but on the other hand, there isn't anything one can do | |
2615 | with an error response, other than log it. Exim used to do that. However, | |
2616 | further discussion suggested that it is positively advantageous not to wait for | |
2617 | the response, but to close the session immediately. This is supposed to move | |
2618 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some | |
2619 | load from the server. (Hosts that are both servers and clients may not see much | |
2620 | difference, of course.) Further discussion indicated that this was safe to do | |
2621 | on Unix systems which have decent implementations of TCP/IP that leave the | |
2622 | connection around for a while (TIME_WAIT) after the application has gone away. | |
2623 | This enables the response sent by the server to be properly ACKed rather than | |
2624 | timed out, as can happen on broken TCP/IP implementations on other OS. | |
2625 | ||
2626 | This change is being made on 31-Jul-98. After over a year of trouble-free | |
2627 | operation, the old commented-out code was removed on 17-Sep-99. */ | |
2628 | ||
2629 | SEND_QUIT: | |
2630 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
2631 | ||
2632 | END_OFF: | |
2633 | ||
2634 | #ifdef SUPPORT_TLS | |
817d9f57 | 2635 | tls_close(FALSE, TRUE); |
0756eb3c PH |
2636 | #endif |
2637 | ||
2638 | /* Close the socket, and return the appropriate value, first setting | |
0756eb3c PH |
2639 | works because the NULL setting is passed back to the calling process, and |
2640 | remote_max_parallel is forced to 1 when delivering over an existing connection, | |
2641 | ||
2642 | If all went well and continue_more is set, we shouldn't actually get here if | |
2643 | there are further addresses, as the return above will be taken. However, | |
2644 | writing RSET might have failed, or there may be other addresses whose hosts are | |
2645 | specified in the transports, and therefore not visible at top level, in which | |
2646 | case continue_more won't get set. */ | |
2647 | ||
f1e894f3 | 2648 | (void)close(inblock.sock); |
a7538db1 | 2649 | |
774ef2d7 JH |
2650 | #ifdef EXPERIMENTAL_EVENT |
2651 | (void) event_raise(tblock->event_action, US"tcp:close", NULL); | |
a7538db1 JH |
2652 | #endif |
2653 | ||
0756eb3c PH |
2654 | continue_transport = NULL; |
2655 | continue_hostname = NULL; | |
2656 | return yield; | |
2657 | } | |
2658 | ||
2659 | ||
2660 | ||
2661 | ||
2662 | /************************************************* | |
2663 | * Closedown entry point * | |
2664 | *************************************************/ | |
2665 | ||
2666 | /* This function is called when exim is passed an open smtp channel | |
2667 | from another incarnation, but the message which it has been asked | |
2668 | to deliver no longer exists. The channel is on stdin. | |
2669 | ||
2670 | We might do fancy things like looking for another message to send down | |
2671 | the channel, but if the one we sought has gone, it has probably been | |
2672 | delivered by some other process that itself will seek further messages, | |
2673 | so just close down our connection. | |
2674 | ||
2675 | Argument: pointer to the transport instance block | |
2676 | Returns: nothing | |
2677 | */ | |
2678 | ||
2679 | void | |
2680 | smtp_transport_closedown(transport_instance *tblock) | |
2681 | { | |
2682 | smtp_transport_options_block *ob = | |
2683 | (smtp_transport_options_block *)(tblock->options_block); | |
2684 | smtp_inblock inblock; | |
2685 | smtp_outblock outblock; | |
2686 | uschar buffer[256]; | |
2687 | uschar inbuffer[4096]; | |
2688 | uschar outbuffer[16]; | |
2689 | ||
2690 | inblock.sock = fileno(stdin); | |
2691 | inblock.buffer = inbuffer; | |
2692 | inblock.buffersize = sizeof(inbuffer); | |
2693 | inblock.ptr = inbuffer; | |
2694 | inblock.ptrend = inbuffer; | |
2695 | ||
2696 | outblock.sock = inblock.sock; | |
2697 | outblock.buffersize = sizeof(outbuffer); | |
2698 | outblock.buffer = outbuffer; | |
2699 | outblock.ptr = outbuffer; | |
2700 | outblock.cmd_count = 0; | |
2701 | outblock.authenticating = FALSE; | |
2702 | ||
2703 | (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
2704 | (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2705 | ob->command_timeout); | |
f1e894f3 | 2706 | (void)close(inblock.sock); |
0756eb3c PH |
2707 | } |
2708 | ||
2709 | ||
2710 | ||
2711 | /************************************************* | |
2712 | * Prepare addresses for delivery * | |
2713 | *************************************************/ | |
2714 | ||
2715 | /* This function is called to flush out error settings from previous delivery | |
2716 | attempts to other hosts. It also records whether we got here via an MX record | |
2717 | or not in the more_errno field of the address. We are interested only in | |
2718 | addresses that are still marked DEFER - others may have got delivered to a | |
2719 | previously considered IP address. Set their status to PENDING_DEFER to indicate | |
2720 | which ones are relevant this time. | |
2721 | ||
2722 | Arguments: | |
2723 | addrlist the list of addresses | |
2724 | host the host we are delivering to | |
2725 | ||
2726 | Returns: the first address for this delivery | |
2727 | */ | |
2728 | ||
2729 | static address_item * | |
2730 | prepare_addresses(address_item *addrlist, host_item *host) | |
2731 | { | |
2732 | address_item *first_addr = NULL; | |
2733 | address_item *addr; | |
2734 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2735 | { | |
2736 | if (addr->transport_return != DEFER) continue; | |
2737 | if (first_addr == NULL) first_addr = addr; | |
2738 | addr->transport_return = PENDING_DEFER; | |
2739 | addr->basic_errno = 0; | |
2740 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; | |
2741 | addr->message = NULL; | |
a7538db1 | 2742 | #ifdef SUPPORT_TLS |
0756eb3c | 2743 | addr->cipher = NULL; |
9d1c15ef JH |
2744 | addr->ourcert = NULL; |
2745 | addr->peercert = NULL; | |
0756eb3c | 2746 | addr->peerdn = NULL; |
018058b2 | 2747 | addr->ocsp = OCSP_NOT_REQ; |
a7538db1 | 2748 | #endif |
0756eb3c PH |
2749 | } |
2750 | return first_addr; | |
2751 | } | |
2752 | ||
2753 | ||
2754 | ||
2755 | /************************************************* | |
2756 | * Main entry point * | |
2757 | *************************************************/ | |
2758 | ||
2759 | /* See local README for interface details. As this is a remote transport, it is | |
2760 | given a chain of addresses to be delivered in one connection, if possible. It | |
2761 | always returns TRUE, indicating that each address has its own independent | |
2762 | status set, except if there is a setting up problem, in which case it returns | |
2763 | FALSE. */ | |
2764 | ||
2765 | BOOL | |
2766 | smtp_transport_entry( | |
2767 | transport_instance *tblock, /* data for this instantiation */ | |
2768 | address_item *addrlist) /* addresses we are working on */ | |
2769 | { | |
2770 | int cutoff_retry; | |
2771 | int port; | |
2772 | int hosts_defer = 0; | |
2773 | int hosts_fail = 0; | |
2774 | int hosts_looked_up = 0; | |
2775 | int hosts_retry = 0; | |
2776 | int hosts_serial = 0; | |
2777 | int hosts_total = 0; | |
8e669ac1 | 2778 | int total_hosts_tried = 0; |
0756eb3c PH |
2779 | address_item *addr; |
2780 | BOOL expired = TRUE; | |
2781 | BOOL continuing = continue_hostname != NULL; | |
2782 | uschar *expanded_hosts = NULL; | |
2783 | uschar *pistring; | |
2784 | uschar *tid = string_sprintf("%s transport", tblock->name); | |
2785 | smtp_transport_options_block *ob = | |
2786 | (smtp_transport_options_block *)(tblock->options_block); | |
2787 | host_item *hostlist = addrlist->host_list; | |
2788 | host_item *host = NULL; | |
2789 | ||
2790 | DEBUG(D_transport) | |
2791 | { | |
2792 | debug_printf("%s transport entered\n", tblock->name); | |
2793 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2794 | debug_printf(" %s\n", addr->address); | |
2795 | if (continuing) debug_printf("already connected to %s [%s]\n", | |
2796 | continue_hostname, continue_host_address); | |
2797 | } | |
2798 | ||
f6c332bd PH |
2799 | /* Set the flag requesting that these hosts be added to the waiting |
2800 | database if the delivery fails temporarily or if we are running with | |
2801 | queue_smtp or a 2-stage queue run. This gets unset for certain | |
2802 | kinds of error, typically those that are specific to the message. */ | |
2803 | ||
2804 | update_waiting = TRUE; | |
2805 | ||
0756eb3c PH |
2806 | /* If a host list is not defined for the addresses - they must all have the |
2807 | same one in order to be passed to a single transport - or if the transport has | |
2808 | a host list with hosts_override set, use the host list supplied with the | |
2809 | transport. It is an error for this not to exist. */ | |
2810 | ||
2811 | if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL)) | |
2812 | { | |
2813 | if (ob->hosts == NULL) | |
2814 | { | |
2815 | addrlist->message = string_sprintf("%s transport called with no hosts set", | |
2816 | tblock->name); | |
2817 | addrlist->transport_return = PANIC; | |
2818 | return FALSE; /* Only top address has status */ | |
2819 | } | |
2820 | ||
2821 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", | |
2822 | ob->hosts); | |
2823 | ||
2824 | /* If the transport's host list contains no '$' characters, and we are not | |
2825 | randomizing, it is fixed and therefore a chain of hosts can be built once | |
2826 | and for all, and remembered for subsequent use by other calls to this | |
2827 | transport. If, on the other hand, the host list does contain '$', or we are | |
2828 | randomizing its order, we have to rebuild it each time. In the fixed case, | |
2829 | as the hosts string will never be used again, it doesn't matter that we | |
2830 | replace all the : characters with zeros. */ | |
2831 | ||
2832 | if (ob->hostlist == NULL) | |
2833 | { | |
2834 | uschar *s = ob->hosts; | |
2835 | ||
2836 | if (Ustrchr(s, '$') != NULL) | |
2837 | { | |
d427a7f9 | 2838 | if (!(expanded_hosts = expand_string(s))) |
0756eb3c PH |
2839 | { |
2840 | addrlist->message = string_sprintf("failed to expand list of hosts " | |
2841 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); | |
2842 | addrlist->transport_return = search_find_defer? DEFER : PANIC; | |
2843 | return FALSE; /* Only top address has status */ | |
2844 | } | |
2845 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " | |
2846 | "\"%s\"\n", s, expanded_hosts); | |
2847 | s = expanded_hosts; | |
2848 | } | |
2849 | else | |
2850 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); | |
2851 | ||
2852 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); | |
2853 | ||
e276e04b TF |
2854 | /* Check that the expansion yielded something useful. */ |
2855 | if (hostlist == NULL) | |
2856 | { | |
2857 | addrlist->message = | |
2858 | string_sprintf("%s transport has empty hosts setting", tblock->name); | |
2859 | addrlist->transport_return = PANIC; | |
2860 | return FALSE; /* Only top address has status */ | |
2861 | } | |
2862 | ||
0756eb3c PH |
2863 | /* If there was no expansion of hosts, save the host list for |
2864 | next time. */ | |
2865 | ||
d427a7f9 | 2866 | if (!expanded_hosts) ob->hostlist = hostlist; |
0756eb3c PH |
2867 | } |
2868 | ||
2869 | /* This is not the first time this transport has been run in this delivery; | |
2870 | the host list was built previously. */ | |
2871 | ||
2872 | else hostlist = ob->hostlist; | |
2873 | } | |
2874 | ||
2875 | /* The host list was supplied with the address. If hosts_randomize is set, we | |
2876 | must sort it into a random order if it did not come from MX records and has not | |
2877 | already been randomized (but don't bother if continuing down an existing | |
2878 | connection). */ | |
2879 | ||
2880 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing) | |
2881 | { | |
2882 | host_item *newlist = NULL; | |
2883 | while (hostlist != NULL) | |
2884 | { | |
2885 | host_item *h = hostlist; | |
2886 | hostlist = hostlist->next; | |
2887 | ||
2888 | h->sort_key = random_number(100); | |
2889 | ||
2890 | if (newlist == NULL) | |
2891 | { | |
2892 | h->next = NULL; | |
2893 | newlist = h; | |
2894 | } | |
2895 | else if (h->sort_key < newlist->sort_key) | |
2896 | { | |
2897 | h->next = newlist; | |
2898 | newlist = h; | |
2899 | } | |
2900 | else | |
2901 | { | |
2902 | host_item *hh = newlist; | |
2903 | while (hh->next != NULL) | |
2904 | { | |
2905 | if (h->sort_key < hh->next->sort_key) break; | |
2906 | hh = hh->next; | |
2907 | } | |
2908 | h->next = hh->next; | |
2909 | hh->next = h; | |
2910 | } | |
2911 | } | |
2912 | ||
2913 | hostlist = addrlist->host_list = newlist; | |
2914 | } | |
2915 | ||
2916 | ||
2d280592 | 2917 | /* Sort out the default port. */ |
0756eb3c PH |
2918 | |
2919 | if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE; | |
0756eb3c PH |
2920 | |
2921 | ||
2922 | /* For each host-plus-IP-address on the list: | |
2923 | ||
2924 | . If this is a continued delivery and the host isn't the one with the | |
2925 | current connection, skip. | |
2926 | ||
2927 | . If the status is unusable (i.e. previously failed or retry checked), skip. | |
2928 | ||
2929 | . If no IP address set, get the address, either by turning the name into | |
2930 | an address, calling gethostbyname if gethostbyname is on, or by calling | |
2931 | the DNS. The DNS may yield multiple addresses, in which case insert the | |
2932 | extra ones into the list. | |
2933 | ||
2934 | . Get the retry data if not previously obtained for this address and set the | |
2935 | field which remembers the state of this address. Skip if the retry time is | |
2936 | not reached. If not, remember whether retry data was found. The retry string | |
2937 | contains both the name and the IP address. | |
2938 | ||
2939 | . Scan the list of addresses and mark those whose status is DEFER as | |
2940 | PENDING_DEFER. These are the only ones that will be processed in this cycle | |
2941 | of the hosts loop. | |
2942 | ||
2943 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. | |
2944 | Some addresses may be successfully delivered, others may fail, and yet | |
2945 | others may get temporary errors and so get marked DEFER. | |
2946 | ||
2947 | . The return from the delivery attempt is OK if a connection was made and a | |
2948 | valid SMTP dialogue was completed. Otherwise it is DEFER. | |
2949 | ||
2950 | . If OK, add a "remove" retry item for this host/IPaddress, if any. | |
2951 | ||
2952 | . If fail to connect, or other defer state, add a retry item. | |
2953 | ||
2954 | . If there are any addresses whose status is still DEFER, carry on to the | |
2955 | next host/IPaddress, unless we have tried the number of hosts given | |
533244af | 2956 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that |
8e669ac1 PH |
2957 | there is some fancy logic for hosts_max_try that means its limit can be |
2958 | overstepped in some circumstances. | |
0756eb3c PH |
2959 | |
2960 | If we get to the end of the list, all hosts have deferred at least one address, | |
2961 | or not reached their retry times. If delay_after_cutoff is unset, it requests a | |
2962 | delivery attempt to those hosts whose last try was before the arrival time of | |
2963 | the current message. To cope with this, we have to go round the loop a second | |
2964 | time. After that, set the status and error data for any addresses that haven't | |
2965 | had it set already. */ | |
2966 | ||
2967 | for (cutoff_retry = 0; expired && | |
2968 | cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2); | |
2969 | cutoff_retry++) | |
2970 | { | |
2971 | host_item *nexthost = NULL; | |
2972 | int unexpired_hosts_tried = 0; | |
2973 | ||
2974 | for (host = hostlist; | |
8e669ac1 | 2975 | host != NULL && |
533244af PH |
2976 | unexpired_hosts_tried < ob->hosts_max_try && |
2977 | total_hosts_tried < ob->hosts_max_try_hardlimit; | |
0756eb3c PH |
2978 | host = nexthost) |
2979 | { | |
2980 | int rc; | |
2981 | int host_af; | |
2982 | uschar *rs; | |
2983 | BOOL serialized = FALSE; | |
2984 | BOOL host_is_expired = FALSE; | |
2985 | BOOL message_defer = FALSE; | |
2986 | BOOL ifchanges = FALSE; | |
2987 | BOOL some_deferred = FALSE; | |
2988 | address_item *first_addr = NULL; | |
2989 | uschar *interface = NULL; | |
2990 | uschar *retry_host_key = NULL; | |
2991 | uschar *retry_message_key = NULL; | |
2992 | uschar *serialize_key = NULL; | |
2993 | ||
9c4e8f60 PH |
2994 | /* Default next host is next host. :-) But this can vary if the |
2995 | hosts_max_try limit is hit (see below). It may also be reset if a host | |
2996 | address is looked up here (in case the host was multihomed). */ | |
2997 | ||
2998 | nexthost = host->next; | |
2999 | ||
0756eb3c PH |
3000 | /* If the address hasn't yet been obtained from the host name, look it up |
3001 | now, unless the host is already marked as unusable. If it is marked as | |
3002 | unusable, it means that the router was unable to find its IP address (in | |
3003 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and | |
3004 | the lookup failed last time. We don't get this far if *all* MX records | |
3005 | point to non-existent hosts; that is treated as a hard error. | |
3006 | ||
3007 | We can just skip this host entirely. When the hosts came from the router, | |
3008 | the address will timeout based on the other host(s); when the address is | |
3009 | looked up below, there is an explicit retry record added. | |
3010 | ||
3011 | Note that we mustn't skip unusable hosts if the address is not unset; they | |
3012 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ | |
3013 | ||
3014 | if (host->address == NULL) | |
3015 | { | |
322050c2 | 3016 | int new_port, flags; |
7cd1141b | 3017 | host_item *hh; |
0756eb3c PH |
3018 | uschar *canonical_name; |
3019 | ||
3020 | if (host->status >= hstatus_unusable) | |
3021 | { | |
3022 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", | |
3023 | host->name); | |
3024 | continue; | |
3025 | } | |
3026 | ||
3027 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); | |
3028 | ||
7cd1141b PH |
3029 | /* The host name is permitted to have an attached port. Find it, and |
3030 | strip it from the name. Just remember it for now. */ | |
3031 | ||
3032 | new_port = host_item_get_port(host); | |
3033 | ||
3034 | /* Count hosts looked up */ | |
3035 | ||
0756eb3c PH |
3036 | hosts_looked_up++; |
3037 | ||
3038 | /* Find by name if so configured, or if it's an IP address. We don't | |
3039 | just copy the IP address, because we need the test-for-local to happen. */ | |
3040 | ||
322050c2 PH |
3041 | flags = HOST_FIND_BY_A; |
3042 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
3043 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
3044 | ||
7e66e54d | 3045 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0) |
322050c2 | 3046 | rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE); |
0756eb3c | 3047 | else |
0756eb3c | 3048 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
578897ea | 3049 | ob->dnssec_request_domains, ob->dnssec_require_domains, |
0756eb3c | 3050 | &canonical_name, NULL); |
0756eb3c | 3051 | |
7cd1141b PH |
3052 | /* Update the host (and any additional blocks, resulting from |
3053 | multihoming) with a host-specific port, if any. */ | |
3054 | ||
3055 | for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port; | |
3056 | ||
0756eb3c PH |
3057 | /* Failure to find the host at this time (usually DNS temporary failure) |
3058 | is really a kind of routing failure rather than a transport failure. | |
3059 | Therefore we add a retry item of the routing kind, not to stop us trying | |
3060 | to look this name up here again, but to ensure the address gets timed | |
3061 | out if the failures go on long enough. A complete failure at this point | |
3062 | commonly points to a configuration error, but the best action is still | |
3063 | to carry on for the next host. */ | |
3064 | ||
3065 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED) | |
3066 | { | |
3067 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); | |
3068 | expired = FALSE; | |
3069 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; | |
3070 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? | |
3071 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); | |
3072 | host->status = hstatus_unusable; | |
3073 | ||
3074 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3075 | { | |
3076 | if (addr->transport_return != DEFER) continue; | |
3077 | addr->basic_errno = ERRNO_UNKNOWNHOST; | |
3078 | addr->message = | |
3079 | string_sprintf("failed to lookup IP address for %s", host->name); | |
3080 | } | |
3081 | continue; | |
3082 | } | |
3083 | ||
3084 | /* If the host is actually the local host, we may have a problem, or | |
3085 | there may be some cunning configuration going on. In the problem case, | |
3086 | log things and give up. The default transport status is already DEFER. */ | |
3087 | ||
3088 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) | |
3089 | { | |
3090 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3091 | { | |
3092 | addr->basic_errno = 0; | |
3093 | addr->message = string_sprintf("%s transport found host %s to be " | |
3094 | "local", tblock->name, host->name); | |
3095 | } | |
3096 | goto END_TRANSPORT; | |
3097 | } | |
3098 | } /* End of block for IP address lookup */ | |
3099 | ||
3100 | /* If this is a continued delivery, we are interested only in the host | |
3101 | which matches the name of the existing open channel. The check is put | |
3102 | here after the local host lookup, in case the name gets expanded as a | |
3103 | result of the lookup. Set expired FALSE, to save the outer loop executing | |
3104 | twice. */ | |
3105 | ||
3106 | if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 || | |
3107 | Ustrcmp(continue_host_address, host->address) != 0)) | |
3108 | { | |
3109 | expired = FALSE; | |
3110 | continue; /* With next host */ | |
3111 | } | |
3112 | ||
9c4e8f60 PH |
3113 | /* Reset the default next host in case a multihomed host whose addresses |
3114 | are not looked up till just above added to the host list. */ | |
83364d30 PH |
3115 | |
3116 | nexthost = host->next; | |
3117 | ||
0756eb3c PH |
3118 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the |
3119 | domain is in queue_smtp_domains, we don't actually want to attempt any | |
3120 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If | |
3121 | there is a lookup defer in queue_smtp_domains, proceed as if the domain | |
3122 | were not in it. We don't want to hold up all SMTP deliveries! Except when | |
3123 | doing a two-stage queue run, don't do this if forcing. */ | |
3124 | ||
3125 | if ((!deliver_force || queue_2stage) && (queue_smtp || | |
cf39cf57 PH |
3126 | match_isinlist(addrlist->domain, &queue_smtp_domains, 0, |
3127 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)) | |
0756eb3c PH |
3128 | { |
3129 | expired = FALSE; | |
3130 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3131 | { | |
3132 | if (addr->transport_return != DEFER) continue; | |
3133 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; | |
3134 | } | |
3135 | continue; /* With next host */ | |
3136 | } | |
3137 | ||
3138 | /* Count hosts being considered - purely for an intelligent comment | |
3139 | if none are usable. */ | |
3140 | ||
3141 | hosts_total++; | |
3142 | ||
3143 | /* Set $host and $host address now in case they are needed for the | |
3144 | interface expansion or the serialize_hosts check; they remain set if an | |
3145 | actual delivery happens. */ | |
3146 | ||
3147 | deliver_host = host->name; | |
3148 | deliver_host_address = host->address; | |
783b385f JH |
3149 | lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes" |
3150 | : host->dnssec == DS_NO ? US"no" | |
3151 | : US""; | |
0756eb3c | 3152 | |
7cd1141b PH |
3153 | /* Set up a string for adding to the retry key if the port number is not |
3154 | the standard SMTP port. A host may have its own port setting that overrides | |
3155 | the default. */ | |
3156 | ||
3157 | pistring = string_sprintf(":%d", (host->port == PORT_NONE)? | |
3158 | port : host->port); | |
3159 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; | |
3160 | ||
0756eb3c PH |
3161 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface |
3162 | string changes upon expansion, we must add it to the key that is used for | |
3163 | retries, because connections to the same host from a different interface | |
3164 | should be treated separately. */ | |
3165 | ||
3166 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6; | |
3167 | if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges, | |
3168 | &interface, tid)) | |
3169 | return FALSE; | |
3170 | if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface); | |
3171 | ||
3172 | /* The first time round the outer loop, check the status of the host by | |
3173 | inspecting the retry data. The second time round, we are interested only | |
3174 | in expired hosts that haven't been tried since this message arrived. */ | |
3175 | ||
3176 | if (cutoff_retry == 0) | |
3177 | { | |
9c695f6d | 3178 | BOOL incl_ip; |
0756eb3c | 3179 | /* Ensure the status of the address is set by checking retry data if |
9c695f6d | 3180 | necessary. There may be host-specific retry data (applicable to all |
0756eb3c PH |
3181 | messages) and also data for retries of a specific message at this host. |
3182 | If either of these retry records are actually read, the keys used are | |
3183 | returned to save recomputing them later. */ | |
3184 | ||
9c695f6d JH |
3185 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
3186 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
3187 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
3188 | continue; /* with next host */ | |
3189 | ||
0756eb3c | 3190 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, |
9c695f6d | 3191 | incl_ip, &retry_host_key, &retry_message_key); |
0756eb3c PH |
3192 | |
3193 | DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name, | |
3194 | (host->address == NULL)? US"" : host->address, pistring, | |
3195 | (host->status == hstatus_usable)? "usable" : | |
3196 | (host->status == hstatus_unusable)? "unusable" : | |
3197 | (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?"); | |
3198 | ||
3199 | /* Skip this address if not usable at this time, noting if it wasn't | |
3200 | actually expired, both locally and in the address. */ | |
3201 | ||
3202 | switch (host->status) | |
3203 | { | |
3204 | case hstatus_unusable: | |
3205 | expired = FALSE; | |
3206 | setflag(addrlist, af_retry_skipped); | |
3207 | /* Fall through */ | |
3208 | ||
3209 | case hstatus_unusable_expired: | |
3210 | switch (host->why) | |
3211 | { | |
3212 | case hwhy_retry: hosts_retry++; break; | |
3213 | case hwhy_failed: hosts_fail++; break; | |
3214 | case hwhy_deferred: hosts_defer++; break; | |
3215 | } | |
3216 | ||
3217 | /* If there was a retry message key, implying that previously there | |
3218 | was a message-specific defer, we don't want to update the list of | |
f6c332bd | 3219 | messages waiting for these hosts. */ |
0756eb3c | 3220 | |
f6c332bd | 3221 | if (retry_message_key != NULL) update_waiting = FALSE; |
0756eb3c PH |
3222 | continue; /* With the next host or IP address */ |
3223 | } | |
3224 | } | |
3225 | ||
3226 | /* Second time round the loop: if the address is set but expired, and | |
3227 | the message is newer than the last try, let it through. */ | |
3228 | ||
3229 | else | |
3230 | { | |
3231 | if (host->address == NULL || | |
3232 | host->status != hstatus_unusable_expired || | |
3233 | host->last_try > received_time) | |
3234 | continue; | |
3235 | DEBUG(D_transport) | |
3236 | debug_printf("trying expired host %s [%s]%s\n", | |
3237 | host->name, host->address, pistring); | |
3238 | host_is_expired = TRUE; | |
3239 | } | |
3240 | ||
3241 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; | |
3242 | it remains TRUE only if all hosts are expired and none are actually tried. | |
3243 | */ | |
3244 | ||
3245 | expired = FALSE; | |
3246 | ||
3247 | /* If this host is listed as one to which access must be serialized, | |
3248 | see if another Exim process has a connection to it, and if so, skip | |
3249 | this host. If not, update the database to record our connection to it | |
3250 | and remember this for later deletion. Do not do any of this if we are | |
3251 | sending the message down a pre-existing connection. */ | |
3252 | ||
3253 | if (!continuing && | |
5130845b | 3254 | verify_check_given_host(&ob->serialize_hosts, host) == OK) |
0756eb3c PH |
3255 | { |
3256 | serialize_key = string_sprintf("host-serialize-%s", host->name); | |
3257 | if (!enq_start(serialize_key)) | |
3258 | { | |
3259 | DEBUG(D_transport) | |
3260 | debug_printf("skipping host %s because another Exim process " | |
3261 | "is connected to it\n", host->name); | |
3262 | hosts_serial++; | |
3263 | continue; | |
3264 | } | |
3265 | serialized = TRUE; | |
3266 | } | |
3267 | ||
3268 | /* OK, we have an IP address that is not waiting for its retry time to | |
3269 | arrive (it might be expired) OR (second time round the loop) we have an | |
3270 | expired host that hasn't been tried since the message arrived. Have a go | |
3271 | at delivering the message to it. First prepare the addresses by flushing | |
3272 | out the result of previous attempts, and finding the first address that | |
3273 | is still to be delivered. */ | |
3274 | ||
3275 | first_addr = prepare_addresses(addrlist, host); | |
3276 | ||
3277 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", | |
3278 | message_id, host->name, host->address, addrlist->address, | |
3279 | (addrlist->next == NULL)? "" : ", ..."); | |
3280 | ||
3281 | set_process_info("delivering %s to %s [%s] (%s%s)", | |
3282 | message_id, host->name, host->address, addrlist->address, | |
3283 | (addrlist->next == NULL)? "" : ", ..."); | |
3284 | ||
3285 | /* This is not for real; don't do the delivery. If there are | |
3286 | any remaining hosts, list them. */ | |
3287 | ||
3288 | if (dont_deliver) | |
3289 | { | |
3290 | host_item *host2; | |
c562fd30 | 3291 | set_errno(addrlist, 0, NULL, OK, FALSE, NULL); |
0756eb3c PH |
3292 | for (addr = addrlist; addr != NULL; addr = addr->next) |
3293 | { | |
3294 | addr->host_used = host; | |
3295 | addr->special_action = '*'; | |
3296 | addr->message = US"delivery bypassed by -N option"; | |
3297 | } | |
3298 | DEBUG(D_transport) | |
3299 | { | |
3300 | debug_printf("*** delivery by %s transport bypassed by -N option\n" | |
3301 | "*** host and remaining hosts:\n", tblock->name); | |
3302 | for (host2 = host; host2 != NULL; host2 = host2->next) | |
3303 | debug_printf(" %s [%s]\n", host2->name, | |
3304 | (host2->address == NULL)? US"unset" : host2->address); | |
3305 | } | |
3306 | rc = OK; | |
3307 | } | |
3308 | ||
3309 | /* This is for real. If the host is expired, we don't count it for | |
3310 | hosts_max_retry. This ensures that all hosts must expire before an address | |
8e669ac1 | 3311 | is timed out, unless hosts_max_try_hardlimit (which protects against |
533244af | 3312 | lunatic DNS configurations) is reached. |
8e669ac1 | 3313 | |
533244af PH |
3314 | If the host is not expired and we are about to hit the hosts_max_retry |
3315 | limit, check to see if there is a subsequent hosts with a different MX | |
3316 | value. If so, make that the next host, and don't count this one. This is a | |
3317 | heuristic to make sure that different MXs do get tried. With a normal kind | |
3318 | of retry rule, they would get tried anyway when the earlier hosts were | |
3319 | delayed, but if the domain has a "retry every time" type of rule - as is | |
3320 | often used for the the very large ISPs, that won't happen. */ | |
0756eb3c PH |
3321 | |
3322 | else | |
3323 | { | |
d427a7f9 JH |
3324 | host_item * thost; |
3325 | /* Make a copy of the host if it is local to this invocation | |
3326 | of the transport. */ | |
3327 | ||
3328 | if (expanded_hosts) | |
3329 | { | |
3330 | thost = store_get(sizeof(host_item)); | |
3331 | *thost = *host; | |
3332 | thost->name = string_copy(host->name); | |
3333 | thost->address = string_copy(host->address); | |
3334 | } | |
3335 | else | |
3336 | thost = host; | |
3337 | ||
0756eb3c PH |
3338 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) |
3339 | { | |
3340 | host_item *h; | |
3341 | DEBUG(D_transport) | |
3342 | debug_printf("hosts_max_try limit reached with this host\n"); | |
3343 | for (h = host; h != NULL; h = h->next) | |
3344 | if (h->mx != host->mx) break; | |
3345 | if (h != NULL) | |
3346 | { | |
3347 | nexthost = h; | |
3348 | unexpired_hosts_tried--; | |
3349 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " | |
3350 | "and will be tried\n"); | |
3351 | } | |
3352 | } | |
3353 | ||
3354 | /* Attempt the delivery. */ | |
3355 | ||
533244af | 3356 | total_hosts_tried++; |
d427a7f9 JH |
3357 | rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock, |
3358 | &message_defer, FALSE); | |
0756eb3c PH |
3359 | |
3360 | /* Yield is one of: | |
3361 | OK => connection made, each address contains its result; | |
3362 | message_defer is set for message-specific defers (when all | |
3363 | recipients are marked defer) | |
3364 | DEFER => there was a non-message-specific delivery problem; | |
3365 | ERROR => there was a problem setting up the arguments for a filter, | |
3366 | or there was a problem with expanding added headers | |
3367 | */ | |
3368 | ||
3369 | /* If the result is not OK, there was a non-message-specific problem. | |
3370 | If the result is DEFER, we need to write to the logs saying what happened | |
3371 | for this particular host, except in the case of authentication and TLS | |
3372 | failures, where the log has already been written. If all hosts defer a | |
3373 | general message is written at the end. */ | |
3374 | ||
3375 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL && | |
3376 | first_addr->basic_errno != ERRNO_TLSFAILURE) | |
3377 | write_logs(first_addr, host); | |
3378 | ||
774ef2d7 | 3379 | #ifdef EXPERIMENTAL_EVENT |
d68218c7 | 3380 | if (rc == DEFER) |
774ef2d7 | 3381 | deferred_event_raise(first_addr, host); |
a7538db1 | 3382 | #endif |
d68218c7 | 3383 | |
0756eb3c PH |
3384 | /* If STARTTLS was accepted, but there was a failure in setting up the |
3385 | TLS session (usually a certificate screwup), and the host is not in | |
3386 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with | |
3387 | TLS forcibly turned off. We have to start from scratch with a new SMTP | |
3388 | connection. That's why the retry is done from here, not from within | |
3389 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the | |
3390 | session, so the in-clear transmission after those errors, if permitted, | |
3391 | happens inside smtp_deliver().] */ | |
3392 | ||
a7538db1 | 3393 | #ifdef SUPPORT_TLS |
7a31d643 JH |
3394 | if ( rc == DEFER |
3395 | && first_addr->basic_errno == ERRNO_TLSFAILURE | |
3396 | && ob->tls_tempfail_tryclear | |
5130845b | 3397 | && verify_check_given_host(&ob->hosts_require_tls, host) != OK |
7a31d643 | 3398 | ) |
0756eb3c PH |
3399 | { |
3400 | log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted " | |
3401 | "to %s [%s] (not in hosts_require_tls)", host->name, host->address); | |
3402 | first_addr = prepare_addresses(addrlist, host); | |
d427a7f9 JH |
3403 | rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock, |
3404 | &message_defer, TRUE); | |
0756eb3c PH |
3405 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) |
3406 | write_logs(first_addr, host); | |
774ef2d7 | 3407 | # ifdef EXPERIMENTAL_EVENT |
d68218c7 | 3408 | if (rc == DEFER) |
774ef2d7 | 3409 | deferred_event_raise(first_addr, host); |
a7538db1 | 3410 | # endif |
0756eb3c | 3411 | } |
a1bccd48 | 3412 | #endif /*SUPPORT_TLS*/ |
0756eb3c PH |
3413 | } |
3414 | ||
3415 | /* Delivery attempt finished */ | |
3416 | ||
3417 | rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)? | |
3418 | US"ERROR" : US"?"; | |
3419 | ||
3420 | set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s", | |
3421 | message_id, host->name, host->address, addrlist->address, | |
3422 | (addrlist->next == NULL)? "" : " (& others)", rs); | |
3423 | ||
3424 | /* Release serialization if set up */ | |
3425 | ||
3426 | if (serialized) enq_end(serialize_key); | |
3427 | ||
3428 | /* If the result is DEFER, or if a host retry record is known to exist, we | |
3429 | need to add an item to the retry chain for updating the retry database | |
3430 | at the end of delivery. We only need to add the item to the top address, | |
3431 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it | |
3432 | for any other delivery attempts using the same address. (It is copied into | |
3433 | the unusable tree at the outer level, so even if different address blocks | |
3434 | contain the same address, it still won't get tried again.) */ | |
3435 | ||
3436 | if (rc == DEFER || retry_host_key != NULL) | |
3437 | { | |
3438 | int delete_flag = (rc != DEFER)? rf_delete : 0; | |
3439 | if (retry_host_key == NULL) | |
3440 | { | |
9c695f6d JH |
3441 | BOOL incl_ip; |
3442 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, | |
3443 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
3444 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
3445 | incl_ip = TRUE; /* error; use most-specific retry record */ | |
3446 | ||
3447 | retry_host_key = incl_ip ? | |
0756eb3c PH |
3448 | string_sprintf("T:%S:%s%s", host->name, host->address, pistring) : |
3449 | string_sprintf("T:%S%s", host->name, pistring); | |
3450 | } | |
3451 | ||
3452 | /* If a delivery of another message over an existing SMTP connection | |
3453 | yields DEFER, we do NOT set up retry data for the host. This covers the | |
3454 | case when there are delays in routing the addresses in the second message | |
3455 | that are so long that the server times out. This is alleviated by not | |
3456 | routing addresses that previously had routing defers when handling an | |
3457 | existing connection, but even so, this case may occur (e.g. if a | |
3458 | previously happily routed address starts giving routing defers). If the | |
3459 | host is genuinely down, another non-continued message delivery will | |
3460 | notice it soon enough. */ | |
3461 | ||
3462 | if (delete_flag != 0 || !continuing) | |
3463 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); | |
3464 | ||
3465 | /* We may have tried an expired host, if its retry time has come; ensure | |
3466 | the status reflects the expiry for the benefit of any other addresses. */ | |
3467 | ||
3468 | if (rc == DEFER) | |
3469 | { | |
3470 | host->status = (host_is_expired)? | |
3471 | hstatus_unusable_expired : hstatus_unusable; | |
3472 | host->why = hwhy_deferred; | |
3473 | } | |
3474 | } | |
3475 | ||
3476 | /* If message_defer is set (host was OK, but every recipient got deferred | |
3477 | because of some message-specific problem), or if that had happened | |
3478 | previously so that a message retry key exists, add an appropriate item | |
3479 | to the retry chain. Note that if there was a message defer but now there is | |
3480 | a host defer, the message defer record gets deleted. That seems perfectly | |
3481 | reasonable. Also, stop the message from being remembered as waiting | |
f6c332bd | 3482 | for specific hosts. */ |
0756eb3c PH |
3483 | |
3484 | if (message_defer || retry_message_key != NULL) | |
3485 | { | |
3486 | int delete_flag = message_defer? 0 : rf_delete; | |
3487 | if (retry_message_key == NULL) | |
3488 | { | |
9c695f6d JH |
3489 | BOOL incl_ip; |
3490 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, | |
3491 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
3492 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
3493 | incl_ip = TRUE; /* error; use most-specific retry record */ | |
3494 | ||
3495 | retry_message_key = incl_ip ? | |
0756eb3c PH |
3496 | string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, |
3497 | message_id) : | |
3498 | string_sprintf("T:%S%s:%s", host->name, pistring, message_id); | |
3499 | } | |
3500 | retry_add_item(addrlist, retry_message_key, | |
3501 | rf_message | rf_host | delete_flag); | |
f6c332bd | 3502 | update_waiting = FALSE; |
0756eb3c PH |
3503 | } |
3504 | ||
3505 | /* Any return other than DEFER (that is, OK or ERROR) means that the | |
3506 | addresses have got their final statuses filled in for this host. In the OK | |
3507 | case, see if any of them are deferred. */ | |
3508 | ||
3509 | if (rc == OK) | |
3510 | { | |
3511 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3512 | { | |
3513 | if (addr->transport_return == DEFER) | |
3514 | { | |
3515 | some_deferred = TRUE; | |
3516 | break; | |
3517 | } | |
3518 | } | |
3519 | } | |
3520 | ||
3521 | /* If no addresses deferred or the result was ERROR, return. We do this for | |
3522 | ERROR because a failing filter set-up or add_headers expansion is likely to | |
3523 | fail for any host we try. */ | |
3524 | ||
3525 | if (rc == ERROR || (rc == OK && !some_deferred)) | |
3526 | { | |
3527 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
3528 | return TRUE; /* Each address has its status */ | |
3529 | } | |
3530 | ||
3531 | /* If the result was DEFER or some individual addresses deferred, let | |
3532 | the loop run to try other hosts with the deferred addresses, except for the | |
3533 | case when we were trying to deliver down an existing channel and failed. | |
3534 | Don't try any other hosts in this case. */ | |
3535 | ||
3536 | if (continuing) break; | |
3537 | ||
3538 | /* If the whole delivery, or some individual addresses, were deferred and | |
3539 | there are more hosts that could be tried, do not count this host towards | |
3540 | the hosts_max_try limit if the age of the message is greater than the | |
3541 | maximum retry time for this host. This means we may try try all hosts, | |
3542 | ignoring the limit, when messages have been around for some time. This is | |
3543 | important because if we don't try all hosts, the address will never time | |
533244af | 3544 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ |
0756eb3c PH |
3545 | |
3546 | if ((rc == DEFER || some_deferred) && nexthost != NULL) | |
3547 | { | |
3548 | BOOL timedout; | |
3549 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); | |
3550 | ||
3551 | if (retry != NULL && retry->rules != NULL) | |
3552 | { | |
3553 | retry_rule *last_rule; | |
3554 | for (last_rule = retry->rules; | |
3555 | last_rule->next != NULL; | |
3556 | last_rule = last_rule->next); | |
3557 | timedout = time(NULL) - received_time > last_rule->timeout; | |
3558 | } | |
3559 | else timedout = TRUE; /* No rule => timed out */ | |
3560 | ||
3561 | if (timedout) | |
3562 | { | |
3563 | unexpired_hosts_tried--; | |
3564 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " | |
3565 | "hosts_max_try (message older than host's retry time)\n"); | |
3566 | } | |
3567 | } | |
3568 | } /* End of loop for trying multiple hosts. */ | |
3569 | ||
3570 | /* This is the end of the loop that repeats iff expired is TRUE and | |
3571 | ob->delay_after_cutoff is FALSE. The second time round we will | |
3572 | try those hosts that haven't been tried since the message arrived. */ | |
3573 | ||
3574 | DEBUG(D_transport) | |
3575 | { | |
3576 | debug_printf("all IP addresses skipped or deferred at least one address\n"); | |
3577 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) | |
3578 | debug_printf("retrying IP addresses not tried since message arrived\n"); | |
3579 | } | |
3580 | } | |
3581 | ||
3582 | ||
3583 | /* Get here if all IP addresses are skipped or defer at least one address. In | |
3584 | MUA wrapper mode, this will happen only for connection or other non-message- | |
3585 | specific failures. Force the delivery status for all addresses to FAIL. */ | |
3586 | ||
3587 | if (mua_wrapper) | |
3588 | { | |
3589 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3590 | addr->transport_return = FAIL; | |
3591 | goto END_TRANSPORT; | |
3592 | } | |
3593 | ||
3594 | /* In the normal, non-wrapper case, add a standard message to each deferred | |
3595 | address if there hasn't been an error, that is, if it hasn't actually been | |
3596 | tried this time. The variable "expired" will be FALSE if any deliveries were | |
3597 | actually tried, or if there was at least one host that was not expired. That | |
3598 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If | |
3599 | a delivery has been tried, an error code will be set, and the failing of the | |
3600 | message is handled by the retry code later. | |
3601 | ||
3602 | If queue_smtp is set, or this transport was called to send a subsequent message | |
3603 | down an existing TCP/IP connection, and something caused the host not to be | |
3604 | found, we end up here, but can detect these cases and handle them specially. */ | |
3605 | ||
3606 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3607 | { | |
3608 | /* If host is not NULL, it means that we stopped processing the host list | |
533244af PH |
3609 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this |
3610 | means we need to behave as if some hosts were skipped because their retry | |
3611 | time had not come. Specifically, this prevents the address from timing out. | |
8e669ac1 | 3612 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all |
533244af | 3613 | hosts were tried. */ |
0756eb3c PH |
3614 | |
3615 | if (host != NULL) | |
3616 | { | |
533244af PH |
3617 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
3618 | { | |
3619 | DEBUG(D_transport) | |
3620 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " | |
3621 | "hosts were tried\n"); | |
3622 | } | |
3623 | else | |
8e669ac1 | 3624 | { |
533244af PH |
3625 | DEBUG(D_transport) |
3626 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); | |
3627 | setflag(addr, af_retry_skipped); | |
8e669ac1 | 3628 | } |
0756eb3c PH |
3629 | } |
3630 | ||
3631 | if (queue_smtp) /* no deliveries attempted */ | |
3632 | { | |
3633 | addr->transport_return = DEFER; | |
3634 | addr->basic_errno = 0; | |
3635 | addr->message = US"SMTP delivery explicitly queued"; | |
3636 | } | |
3637 | ||
3638 | else if (addr->transport_return == DEFER && | |
3639 | (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) && | |
3640 | addr->message == NULL) | |
3641 | { | |
3642 | addr->basic_errno = ERRNO_HRETRY; | |
3643 | if (continue_hostname != NULL) | |
3644 | { | |
3645 | addr->message = US"no host found for existing SMTP connection"; | |
3646 | } | |
3647 | else if (expired) | |
3648 | { | |
fffffe4c | 3649 | setflag(addr, af_pass_message); /* This is not a security risk */ |
0756eb3c PH |
3650 | addr->message = (ob->delay_after_cutoff)? |
3651 | US"retry time not reached for any host after a long failure period" : | |
3652 | US"all hosts have been failing for a long time and were last tried " | |
3653 | "after this message arrived"; | |
3654 | ||
3655 | /* If we are already using fallback hosts, or there are no fallback hosts | |
3656 | defined, convert the result to FAIL to cause a bounce. */ | |
3657 | ||
3658 | if (addr->host_list == addr->fallback_hosts || | |
3659 | addr->fallback_hosts == NULL) | |
3660 | addr->transport_return = FAIL; | |
3661 | } | |
3662 | else | |
3663 | { | |
3664 | if (hosts_retry == hosts_total) | |
3665 | addr->message = US"retry time not reached for any host"; | |
3666 | else if (hosts_fail == hosts_total) | |
3667 | addr->message = US"all host address lookups failed permanently"; | |
3668 | else if (hosts_defer == hosts_total) | |
3669 | addr->message = US"all host address lookups failed temporarily"; | |
3670 | else if (hosts_serial == hosts_total) | |
3671 | addr->message = US"connection limit reached for all hosts"; | |
3672 | else if (hosts_fail+hosts_defer == hosts_total) | |
3673 | addr->message = US"all host address lookups failed"; | |
3674 | else addr->message = US"some host address lookups failed and retry time " | |
3675 | "not reached for other hosts or connection limit reached"; | |
3676 | } | |
3677 | } | |
3678 | } | |
3679 | ||
3680 | /* Update the database which keeps information about which messages are waiting | |
f6c332bd PH |
3681 | for which hosts to become available. For some message-specific errors, the |
3682 | update_waiting flag is turned off because we don't want follow-on deliveries in | |
ea722490 | 3683 | those cases. If this transport instance is explicitly limited to one message |
8b260705 PP |
3684 | per connection then follow-on deliveries are not possible and there's no need |
3685 | to create/update the per-transport wait-<transport_name> database. */ | |
0756eb3c | 3686 | |
ea722490 JH |
3687 | if (update_waiting && tblock->connection_max_messages != 1) |
3688 | transport_update_waiting(hostlist, tblock->name); | |
0756eb3c PH |
3689 | |
3690 | END_TRANSPORT: | |
3691 | ||
3692 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
3693 | ||
3694 | return TRUE; /* Each address has its status */ | |
3695 | } | |
3696 | ||
578897ea JH |
3697 | /* vi: aw ai sw=2 |
3698 | */ | |
0756eb3c | 3699 | /* End of transport/smtp.c */ |