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 | { "tls_verify_cert_hostnames", opt_stringptr, |
180 | (void *)offsetof(smtp_transport_options_block,tls_verify_cert_hostnames)}, | |
0756eb3c | 181 | { "tls_verify_certificates", opt_stringptr, |
a63be306 WB |
182 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) }, |
183 | { "tls_verify_hosts", opt_stringptr, | |
184 | (void *)offsetof(smtp_transport_options_block, tls_verify_hosts) } | |
80a47a2c | 185 | #endif |
0756eb3c PH |
186 | }; |
187 | ||
188 | /* Size of the options list. An extern variable has to be used so that its | |
189 | address can appear in the tables drtables.c. */ | |
190 | ||
191 | int smtp_transport_options_count = | |
192 | sizeof(smtp_transport_options)/sizeof(optionlist); | |
193 | ||
194 | /* Default private options block for the smtp transport. */ | |
195 | ||
196 | smtp_transport_options_block smtp_transport_option_defaults = { | |
197 | NULL, /* hosts */ | |
198 | NULL, /* fallback_hosts */ | |
199 | NULL, /* hostlist */ | |
200 | NULL, /* fallback_hostlist */ | |
201 | NULL, /* authenticated_sender */ | |
202 | US"$primary_hostname", /* helo_data */ | |
203 | NULL, /* interface */ | |
204 | NULL, /* port */ | |
205 | US"smtp", /* protocol */ | |
9e4f5962 | 206 | NULL, /* DSCP */ |
0756eb3c PH |
207 | NULL, /* serialize_hosts */ |
208 | NULL, /* hosts_try_auth */ | |
209 | NULL, /* hosts_require_auth */ | |
96e47838 TL |
210 | #ifdef EXPERIMENTAL_DANE |
211 | NULL, /* hosts_try_dane */ | |
7a31d643 | 212 | NULL, /* hosts_require_dane */ |
96e47838 | 213 | #endif |
8ccd00b1 | 214 | #ifndef DISABLE_PRDR |
ad07e9ad | 215 | US"*", /* hosts_try_prdr */ |
f5d78688 | 216 | #endif |
f2de3a33 | 217 | #ifndef DISABLE_OCSP |
0e66b3b6 | 218 | US"*", /* hosts_request_ocsp (except under DANE; tls_client_start()) */ |
f5d78688 | 219 | NULL, /* hosts_require_ocsp */ |
fd98a5c6 | 220 | #endif |
0756eb3c PH |
221 | NULL, /* hosts_require_tls */ |
222 | NULL, /* hosts_avoid_tls */ | |
99400968 | 223 | US"*", /* hosts_verify_avoid_tls */ |
c51b8e75 | 224 | NULL, /* hosts_avoid_pipelining */ |
0756eb3c PH |
225 | NULL, /* hosts_avoid_esmtp */ |
226 | NULL, /* hosts_nopass_tls */ | |
227 | 5*60, /* command_timeout */ | |
228 | 5*60, /* connect_timeout; shorter system default overrides */ | |
229 | 5*60, /* data timeout */ | |
230 | 10*60, /* final timeout */ | |
231 | 1024, /* size_addition */ | |
232 | 5, /* hosts_max_try */ | |
8e669ac1 | 233 | 50, /* hosts_max_try_hardlimit */ |
48c7f9e2 | 234 | TRUE, /* address_retry_include_sender */ |
0756eb3c | 235 | FALSE, /* allow_localhost */ |
382afc6b | 236 | FALSE, /* authenticated_sender_force */ |
0756eb3c PH |
237 | FALSE, /* gethostbyname */ |
238 | TRUE, /* dns_qualify_single */ | |
239 | FALSE, /* dns_search_parents */ | |
578897ea JH |
240 | NULL, /* dnssec_request_domains */ |
241 | NULL, /* dnssec_require_domains */ | |
0756eb3c PH |
242 | TRUE, /* delay_after_cutoff */ |
243 | FALSE, /* hosts_override */ | |
244 | FALSE, /* hosts_randomize */ | |
245 | TRUE, /* keepalive */ | |
f1513293 | 246 | FALSE, /* lmtp_ignore_quota */ |
9c695f6d | 247 | NULL, /* expand_retry_include_ip_address */ |
0756eb3c | 248 | TRUE /* retry_include_ip_address */ |
80a47a2c | 249 | #ifdef SUPPORT_TLS |
0756eb3c PH |
250 | ,NULL, /* tls_certificate */ |
251 | NULL, /* tls_crl */ | |
252 | NULL, /* tls_privatekey */ | |
253 | NULL, /* tls_require_ciphers */ | |
83da1223 PH |
254 | NULL, /* gnutls_require_kx */ |
255 | NULL, /* gnutls_require_mac */ | |
256 | NULL, /* gnutls_require_proto */ | |
54c90be1 | 257 | NULL, /* tls_sni */ |
0e0f3f56 | 258 | US"system", /* tls_verify_certificates */ |
54c90be1 PP |
259 | EXIM_CLIENT_DH_DEFAULT_MIN_BITS, |
260 | /* tls_dh_min_bits */ | |
a63be306 WB |
261 | TRUE, /* tls_tempfail_tryclear */ |
262 | NULL, /* tls_verify_hosts */ | |
610ff438 | 263 | US"*", /* tls_try_verify_hosts */ |
01a4a5c5 | 264 | US"*" /* tls_verify_cert_hostnames */ |
80a47a2c TK |
265 | #endif |
266 | #ifndef DISABLE_DKIM | |
f7572e5a TK |
267 | ,NULL, /* dkim_canon */ |
268 | NULL, /* dkim_domain */ | |
269 | NULL, /* dkim_private_key */ | |
270 | NULL, /* dkim_selector */ | |
271 | NULL, /* dkim_sign_headers */ | |
272 | NULL /* dkim_strict */ | |
80a47a2c | 273 | #endif |
0756eb3c PH |
274 | }; |
275 | ||
6c1c3d1d WB |
276 | /* some DSN flags for use later */ |
277 | ||
278 | static int rf_list[] = {rf_notify_never, rf_notify_success, | |
279 | rf_notify_failure, rf_notify_delay }; | |
280 | ||
45500060 | 281 | static uschar *rf_names[] = { US"NEVER", US"SUCCESS", US"FAILURE", US"DELAY" }; |
6c1c3d1d WB |
282 | |
283 | ||
0756eb3c PH |
284 | |
285 | /* Local statics */ | |
286 | ||
287 | static uschar *smtp_command; /* Points to last cmd for error messages */ | |
288 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ | |
f6c332bd | 289 | static BOOL update_waiting; /* TRUE to update the "wait" database */ |
0756eb3c PH |
290 | |
291 | ||
292 | /************************************************* | |
293 | * Setup entry point * | |
294 | *************************************************/ | |
295 | ||
296 | /* This function is called when the transport is about to be used, | |
297 | but before running it in a sub-process. It is used for two things: | |
298 | ||
299 | (1) To set the fallback host list in addresses, when delivering. | |
26da7e20 PH |
300 | (2) To pass back the interface, port, protocol, and other options, for use |
301 | during callout verification. | |
0756eb3c PH |
302 | |
303 | Arguments: | |
304 | tblock pointer to the transport instance block | |
305 | addrlist list of addresses about to be transported | |
306 | tf if not NULL, pointer to block in which to return options | |
929ba01c PH |
307 | uid the uid that will be set (not used) |
308 | gid the gid that will be set (not used) | |
0756eb3c PH |
309 | errmsg place for error message (not used) |
310 | ||
311 | Returns: OK always (FAIL, DEFER not used) | |
312 | */ | |
313 | ||
314 | static int | |
315 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, | |
929ba01c | 316 | transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg) |
0756eb3c PH |
317 | { |
318 | smtp_transport_options_block *ob = | |
319 | (smtp_transport_options_block *)(tblock->options_block); | |
320 | ||
321 | errmsg = errmsg; /* Keep picky compilers happy */ | |
929ba01c PH |
322 | uid = uid; |
323 | gid = gid; | |
0756eb3c PH |
324 | |
325 | /* Pass back options if required. This interface is getting very messy. */ | |
326 | ||
327 | if (tf != NULL) | |
328 | { | |
329 | tf->interface = ob->interface; | |
330 | tf->port = ob->port; | |
331 | tf->protocol = ob->protocol; | |
332 | tf->hosts = ob->hosts; | |
333 | tf->hosts_override = ob->hosts_override; | |
334 | tf->hosts_randomize = ob->hosts_randomize; | |
335 | tf->gethostbyname = ob->gethostbyname; | |
336 | tf->qualify_single = ob->dns_qualify_single; | |
337 | tf->search_parents = ob->dns_search_parents; | |
26da7e20 | 338 | tf->helo_data = ob->helo_data; |
0756eb3c PH |
339 | } |
340 | ||
341 | /* Set the fallback host list for all the addresses that don't have fallback | |
342 | host lists, provided that the local host wasn't present in the original host | |
343 | list. */ | |
344 | ||
345 | if (!testflag(addrlist, af_local_host_removed)) | |
346 | { | |
347 | for (; addrlist != NULL; addrlist = addrlist->next) | |
348 | if (addrlist->fallback_hosts == NULL) | |
349 | addrlist->fallback_hosts = ob->fallback_hostlist; | |
350 | } | |
351 | ||
352 | return OK; | |
353 | } | |
354 | ||
355 | ||
356 | ||
357 | /************************************************* | |
358 | * Initialization entry point * | |
359 | *************************************************/ | |
360 | ||
361 | /* Called for each instance, after its options have been read, to | |
362 | enable consistency checks to be done, or anything else that needs | |
363 | to be set up. | |
364 | ||
365 | Argument: pointer to the transport instance block | |
366 | Returns: nothing | |
367 | */ | |
368 | ||
369 | void | |
370 | smtp_transport_init(transport_instance *tblock) | |
371 | { | |
372 | smtp_transport_options_block *ob = | |
373 | (smtp_transport_options_block *)(tblock->options_block); | |
374 | ||
375 | /* Retry_use_local_part defaults FALSE if unset */ | |
376 | ||
377 | if (tblock->retry_use_local_part == TRUE_UNSET) | |
378 | tblock->retry_use_local_part = FALSE; | |
379 | ||
380 | /* Set the default port according to the protocol */ | |
381 | ||
382 | if (ob->port == NULL) | |
061b7ebd PP |
383 | ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : |
384 | (strcmpic(ob->protocol, US"smtps") == 0)? US"smtps" : US"smtp"; | |
0756eb3c PH |
385 | |
386 | /* Set up the setup entry point, to be called before subprocesses for this | |
387 | transport. */ | |
388 | ||
389 | tblock->setup = smtp_transport_setup; | |
390 | ||
391 | /* Complain if any of the timeouts are zero. */ | |
392 | ||
393 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || | |
394 | ob->final_timeout <= 0) | |
395 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
396 | "command, data, or final timeout value is zero for %s transport", | |
397 | tblock->name); | |
398 | ||
399 | /* If hosts_override is set and there are local hosts, set the global | |
400 | flag that stops verify from showing router hosts. */ | |
401 | ||
402 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; | |
403 | ||
404 | /* If there are any fallback hosts listed, build a chain of host items | |
405 | for them, but do not do any lookups at this time. */ | |
406 | ||
407 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); | |
2d571266 | 408 | |
32d07012 | 409 | #ifdef SUPPORT_TLS |
2d571266 JH |
410 | if ( ob->gnutls_require_kx |
411 | || ob->gnutls_require_mac | |
412 | || ob->gnutls_require_proto) | |
413 | log_write(0, LOG_MAIN, "WARNING: smtp transport options" | |
414 | " gnutls_require_kx, gnutls_require_mac and gnutls_require_protocols" | |
415 | " are obsolete\n"); | |
32d07012 | 416 | #endif |
0756eb3c PH |
417 | } |
418 | ||
419 | ||
420 | ||
421 | ||
422 | ||
423 | /************************************************* | |
424 | * Set delivery info into all active addresses * | |
425 | *************************************************/ | |
426 | ||
427 | /* Only addresses whose status is >= PENDING are relevant. A lesser | |
428 | status means that an address is not currently being processed. | |
429 | ||
430 | Arguments: | |
447d236c PH |
431 | addrlist points to a chain of addresses |
432 | errno_value to put in each address's errno field | |
433 | msg to put in each address's message field | |
434 | rc to put in each address's transport_return field | |
435 | pass_message if TRUE, set the "pass message" flag in the address | |
c562fd30 | 436 | host if set, mark addrs as having used this host |
0756eb3c PH |
437 | |
438 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in | |
439 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate | |
440 | this particular type of timeout. | |
441 | ||
442 | Returns: nothing | |
443 | */ | |
444 | ||
7cd1141b PH |
445 | static void |
446 | set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc, | |
c562fd30 | 447 | BOOL pass_message, host_item * host) |
0756eb3c PH |
448 | { |
449 | address_item *addr; | |
450 | int orvalue = 0; | |
451 | if (errno_value == ERRNO_CONNECTTIMEOUT) | |
452 | { | |
453 | errno_value = ETIMEDOUT; | |
454 | orvalue = RTEF_CTOUT; | |
455 | } | |
456 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
168dec3b | 457 | if (addr->transport_return >= PENDING) |
447d236c | 458 | { |
168dec3b JH |
459 | addr->basic_errno = errno_value; |
460 | addr->more_errno |= orvalue; | |
461 | if (msg != NULL) | |
462 | { | |
463 | addr->message = msg; | |
464 | if (pass_message) setflag(addr, af_pass_message); | |
465 | } | |
466 | addr->transport_return = rc; | |
467 | if (host) | |
468 | addr->host_used = host; | |
447d236c | 469 | } |
0756eb3c PH |
470 | } |
471 | ||
472 | ||
473 | ||
474 | /************************************************* | |
475 | * Check an SMTP response * | |
476 | *************************************************/ | |
477 | ||
478 | /* This function is given an errno code and the SMTP response buffer | |
479 | to analyse, together with the host identification for generating messages. It | |
480 | sets an appropriate message and puts the first digit of the response code into | |
481 | the yield variable. If no response was actually read, a suitable digit is | |
482 | chosen. | |
483 | ||
484 | Arguments: | |
447d236c PH |
485 | host the current host, to get its name for messages |
486 | errno_value pointer to the errno value | |
487 | more_errno from the top address for use with ERRNO_FILTER_FAIL | |
488 | buffer the SMTP response buffer | |
489 | yield where to put a one-digit SMTP response code | |
490 | message where to put an errror message | |
491 | pass_message set TRUE if message is an SMTP response | |
492 | ||
493 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE | |
0756eb3c PH |
494 | */ |
495 | ||
a7538db1 JH |
496 | static BOOL |
497 | check_response(host_item *host, int *errno_value, int more_errno, | |
447d236c | 498 | uschar *buffer, int *yield, uschar **message, BOOL *pass_message) |
0756eb3c PH |
499 | { |
500 | uschar *pl = US""; | |
501 | ||
502 | if (smtp_use_pipelining && | |
503 | (Ustrcmp(smtp_command, "MAIL") == 0 || | |
504 | Ustrcmp(smtp_command, "RCPT") == 0 || | |
505 | Ustrcmp(smtp_command, "DATA") == 0)) | |
506 | pl = US"pipelined "; | |
507 | ||
508 | *yield = '4'; /* Default setting is to give a temporary error */ | |
509 | ||
510 | /* Handle response timeout */ | |
511 | ||
512 | if (*errno_value == ETIMEDOUT) | |
513 | { | |
c562fd30 JH |
514 | *message = US string_sprintf("SMTP timeout after %s%s", |
515 | pl, smtp_command); | |
0756eb3c PH |
516 | if (transport_count > 0) |
517 | *message = US string_sprintf("%s (%d bytes written)", *message, | |
518 | transport_count); | |
519 | return FALSE; | |
520 | } | |
521 | ||
522 | /* Handle malformed SMTP response */ | |
523 | ||
524 | if (*errno_value == ERRNO_SMTPFORMAT) | |
525 | { | |
55414b25 | 526 | const uschar *malfresp = string_printing(buffer); |
0756eb3c | 527 | while (isspace(*malfresp)) malfresp++; |
c562fd30 JH |
528 | *message = *malfresp == 0 |
529 | ? string_sprintf("Malformed SMTP reply (an empty line) " | |
530 | "in response to %s%s", pl, smtp_command) | |
531 | : string_sprintf("Malformed SMTP reply in response to %s%s: %s", | |
532 | pl, smtp_command, malfresp); | |
0756eb3c PH |
533 | return FALSE; |
534 | } | |
535 | ||
536 | /* Handle a failed filter process error; can't send QUIT as we mustn't | |
537 | end the DATA. */ | |
538 | ||
539 | if (*errno_value == ERRNO_FILTER_FAIL) | |
540 | { | |
35af9f61 | 541 | *message = US string_sprintf("transport filter process failed (%d)%s", |
8e669ac1 | 542 | more_errno, |
35af9f61 | 543 | (more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); |
0756eb3c PH |
544 | return FALSE; |
545 | } | |
546 | ||
547 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't | |
548 | end the DATA. */ | |
549 | ||
550 | if (*errno_value == ERRNO_CHHEADER_FAIL) | |
551 | { | |
552 | *message = | |
553 | US string_sprintf("failed to expand headers_add or headers_remove: %s", | |
554 | expand_string_message); | |
555 | return FALSE; | |
556 | } | |
557 | ||
558 | /* Handle failure to write a complete data block */ | |
559 | ||
560 | if (*errno_value == ERRNO_WRITEINCOMPLETE) | |
561 | { | |
562 | *message = US string_sprintf("failed to write a data block"); | |
563 | return FALSE; | |
564 | } | |
565 | ||
566 | /* Handle error responses from the remote mailer. */ | |
567 | ||
568 | if (buffer[0] != 0) | |
569 | { | |
55414b25 | 570 | const uschar *s = string_printing(buffer); |
447d236c | 571 | *message = US string_sprintf("SMTP error from remote mail server after %s%s: " |
c562fd30 | 572 | "%s", pl, smtp_command, s); |
447d236c | 573 | *pass_message = TRUE; |
0756eb3c PH |
574 | *yield = buffer[0]; |
575 | return TRUE; | |
576 | } | |
577 | ||
578 | /* No data was read. If there is no errno, this must be the EOF (i.e. | |
19b9dc85 PH |
579 | connection closed) case, which causes deferral. An explicit connection reset |
580 | error has the same effect. Otherwise, put the host's identity in the message, | |
581 | leaving the errno value to be interpreted as well. In all cases, we have to | |
582 | assume the connection is now dead. */ | |
0756eb3c | 583 | |
19b9dc85 | 584 | if (*errno_value == 0 || *errno_value == ECONNRESET) |
0756eb3c PH |
585 | { |
586 | *errno_value = ERRNO_SMTPCLOSED; | |
c562fd30 JH |
587 | *message = US string_sprintf("Remote host closed connection " |
588 | "in response to %s%s", pl, smtp_command); | |
0756eb3c PH |
589 | } |
590 | else *message = US string_sprintf("%s [%s]", host->name, host->address); | |
591 | ||
592 | return FALSE; | |
593 | } | |
594 | ||
595 | ||
596 | ||
597 | /************************************************* | |
598 | * Write error message to logs * | |
599 | *************************************************/ | |
600 | ||
601 | /* This writes to the main log and to the message log. | |
602 | ||
603 | Arguments: | |
604 | addr the address item containing error information | |
605 | host the current host | |
606 | ||
607 | Returns: nothing | |
608 | */ | |
609 | ||
610 | static void | |
611 | write_logs(address_item *addr, host_item *host) | |
612 | { | |
c562fd30 JH |
613 | uschar * message = string_sprintf("H=%s [%s]", host->name, host->address); |
614 | ||
615 | if (addr->message) | |
0756eb3c | 616 | { |
c562fd30 | 617 | message = string_sprintf("%s: %s", message, addr->message); |
0756eb3c PH |
618 | if (addr->basic_errno > 0) |
619 | message = string_sprintf("%s: %s", message, strerror(addr->basic_errno)); | |
620 | log_write(0, LOG_MAIN, "%s", message); | |
621 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); | |
622 | } | |
623 | else | |
624 | { | |
c562fd30 JH |
625 | if (log_extra_selector & LX_outgoing_port) |
626 | message = string_sprintf("%s:%d", message, | |
627 | host->port == PORT_NONE ? 25 : host->port); | |
628 | log_write(0, LOG_MAIN, "%s %s", message, strerror(addr->basic_errno)); | |
629 | deliver_msglog("%s %s %s\n", tod_stamp(tod_log), message, | |
630 | strerror(addr->basic_errno)); | |
0756eb3c PH |
631 | } |
632 | } | |
633 | ||
c562fd30 JH |
634 | static void |
635 | msglog_line(host_item * host, uschar * message) | |
636 | { | |
637 | deliver_msglog("%s H=%s [%s] %s\n", tod_stamp(tod_log), | |
638 | host->name, host->address, message); | |
639 | } | |
640 | ||
0756eb3c PH |
641 | |
642 | ||
774ef2d7 | 643 | #ifdef EXPERIMENTAL_EVENT |
d68218c7 JH |
644 | /************************************************* |
645 | * Post-defer action * | |
646 | *************************************************/ | |
647 | ||
648 | /* This expands an arbitrary per-transport string. | |
649 | It might, for example, be used to write to the database log. | |
650 | ||
651 | Arguments: | |
d68218c7 JH |
652 | addr the address item containing error information |
653 | host the current host | |
654 | ||
655 | Returns: nothing | |
656 | */ | |
657 | ||
658 | static void | |
774ef2d7 | 659 | deferred_event_raise(address_item *addr, host_item *host) |
d68218c7 | 660 | { |
774ef2d7 | 661 | uschar * action = addr->transport->event_action; |
55414b25 | 662 | const uschar * save_domain; |
a7538db1 JH |
663 | uschar * save_local; |
664 | ||
d68218c7 | 665 | if (!action) |
a7538db1 | 666 | return; |
d68218c7 | 667 | |
a7538db1 JH |
668 | save_domain = deliver_domain; |
669 | save_local = deliver_localpart; | |
670 | ||
671 | /*XXX would ip & port already be set up? */ | |
672 | deliver_host_address = string_copy(host->address); | |
774ef2d7 JH |
673 | deliver_host_port = host->port == PORT_NONE ? 25 : host->port; |
674 | event_defer_errno = addr->basic_errno; | |
d68218c7 JH |
675 | |
676 | router_name = addr->router->name; | |
677 | transport_name = addr->transport->name; | |
a7538db1 JH |
678 | deliver_domain = addr->domain; |
679 | deliver_localpart = addr->local_part; | |
680 | ||
774ef2d7 | 681 | (void) event_raise(action, US"msg:host:defer", |
a7538db1 JH |
682 | addr->message |
683 | ? addr->basic_errno > 0 | |
684 | ? string_sprintf("%s: %s", addr->message, strerror(addr->basic_errno)) | |
685 | : string_copy(addr->message) | |
686 | : addr->basic_errno > 0 | |
687 | ? string_copy(US strerror(addr->basic_errno)) | |
688 | : NULL); | |
689 | ||
690 | deliver_localpart = save_local; | |
691 | deliver_domain = save_domain; | |
d68218c7 JH |
692 | router_name = transport_name = NULL; |
693 | } | |
694 | #endif | |
695 | ||
696 | ||
697 | ||
0756eb3c PH |
698 | /************************************************* |
699 | * Synchronize SMTP responses * | |
700 | *************************************************/ | |
701 | ||
702 | /* This function is called from smtp_deliver() to receive SMTP responses from | |
703 | the server, and match them up with the commands to which they relate. When | |
704 | PIPELINING is not in use, this function is called after every command, and is | |
705 | therefore somewhat over-engineered, but it is simpler to use a single scheme | |
706 | that works both with and without PIPELINING instead of having two separate sets | |
707 | of code. | |
708 | ||
709 | The set of commands that are buffered up with pipelining may start with MAIL | |
710 | and may end with DATA; in between are RCPT commands that correspond to the | |
711 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, | |
712 | etc.) are never buffered. | |
713 | ||
714 | Errors after MAIL or DATA abort the whole process leaving the response in the | |
715 | buffer. After MAIL, pending responses are flushed, and the original command is | |
716 | re-instated in big_buffer for error messages. For RCPT commands, the remote is | |
717 | permitted to reject some recipient addresses while accepting others. However | |
718 | certain errors clearly abort the whole process. Set the value in | |
719 | transport_return to PENDING_OK if the address is accepted. If there is a | |
720 | subsequent general error, it will get reset accordingly. If not, it will get | |
721 | converted to OK at the end. | |
722 | ||
723 | Arguments: | |
48c7f9e2 PH |
724 | addrlist the complete address list |
725 | include_affixes TRUE if affixes include in RCPT | |
726 | sync_addr ptr to the ptr of the one to start scanning at (updated) | |
727 | host the host we are connected to | |
728 | count the number of responses to read | |
729 | address_retry_ | |
730 | include_sender true if 4xx retry is to include the sender it its key | |
731 | pending_MAIL true if the first response is for MAIL | |
732 | pending_DATA 0 if last command sent was not DATA | |
733 | +1 if previously had a good recipient | |
734 | -1 if not previously had a good recipient | |
735 | inblock incoming SMTP block | |
736 | timeout timeout value | |
737 | buffer buffer for reading response | |
738 | buffsize size of buffer | |
0756eb3c PH |
739 | |
740 | Returns: 3 if at least one address had 2xx and one had 5xx | |
741 | 2 if at least one address had 5xx but none had 2xx | |
742 | 1 if at least one host had a 2xx response, but none had 5xx | |
743 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) | |
744 | -1 timeout while reading RCPT response | |
745 | -2 I/O or other non-response error for RCPT | |
746 | -3 DATA or MAIL failed - errno and buffer set | |
747 | */ | |
748 | ||
749 | static int | |
750 | sync_responses(address_item *addrlist, BOOL include_affixes, | |
48c7f9e2 PH |
751 | address_item **sync_addr, host_item *host, int count, |
752 | BOOL address_retry_include_sender, BOOL pending_MAIL, | |
0756eb3c PH |
753 | int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer, |
754 | int buffsize) | |
755 | { | |
756 | address_item *addr = *sync_addr; | |
757 | int yield = 0; | |
758 | ||
759 | /* Handle the response for a MAIL command. On error, reinstate the original | |
760 | command in big_buffer for error message use, and flush any further pending | |
761 | responses before returning, except after I/O errors and timeouts. */ | |
762 | ||
763 | if (pending_MAIL) | |
764 | { | |
765 | count--; | |
766 | if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
767 | { | |
768 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ | |
769 | if (errno == 0 && buffer[0] != 0) | |
770 | { | |
771 | uschar flushbuffer[4096]; | |
e97957bc PH |
772 | int save_errno = 0; |
773 | if (buffer[0] == '4') | |
774 | { | |
775 | save_errno = ERRNO_MAIL4XX; | |
776 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
777 | } | |
0756eb3c PH |
778 | while (count-- > 0) |
779 | { | |
780 | if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer), | |
781 | '2', timeout) | |
782 | && (errno != 0 || flushbuffer[0] == 0)) | |
783 | break; | |
784 | } | |
e97957bc | 785 | errno = save_errno; |
0756eb3c | 786 | } |
c562fd30 JH |
787 | |
788 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
789 | while (count-- > 0) /* Mark any pending addrs with the host used */ | |
790 | { | |
791 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; | |
792 | addr->host_used = host; | |
793 | addr = addr->next; | |
794 | } | |
0756eb3c PH |
795 | return -3; |
796 | } | |
797 | } | |
798 | ||
799 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
800 | ||
801 | /* Read and handle the required number of RCPT responses, matching each one up | |
802 | with an address by scanning for the next address whose status is PENDING_DEFER. | |
803 | */ | |
804 | ||
805 | while (count-- > 0) | |
806 | { | |
807 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; | |
808 | ||
809 | /* The address was accepted */ | |
c562fd30 | 810 | addr->host_used = host; |
0756eb3c PH |
811 | |
812 | if (smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
813 | { | |
814 | yield |= 1; | |
815 | addr->transport_return = PENDING_OK; | |
816 | ||
817 | /* If af_dr_retry_exists is set, there was a routing delay on this address; | |
09945f1e PH |
818 | ensure that any address-specific retry record is expunged. We do this both |
819 | for the basic key and for the version that also includes the sender. */ | |
0756eb3c PH |
820 | |
821 | if (testflag(addr, af_dr_retry_exists)) | |
09945f1e PH |
822 | { |
823 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, | |
824 | sender_address); | |
825 | retry_add_item(addr, altkey, rf_delete); | |
0756eb3c | 826 | retry_add_item(addr, addr->address_retry_key, rf_delete); |
09945f1e | 827 | } |
0756eb3c PH |
828 | } |
829 | ||
830 | /* Timeout while reading the response */ | |
831 | ||
832 | else if (errno == ETIMEDOUT) | |
833 | { | |
c562fd30 JH |
834 | uschar *message = string_sprintf("SMTP timeout after RCPT TO:<%s>", |
835 | transport_rcpt_address(addr, include_affixes)); | |
168dec3b | 836 | set_errno(addrlist, ETIMEDOUT, message, DEFER, FALSE, NULL); |
0756eb3c | 837 | retry_add_item(addr, addr->address_retry_key, 0); |
f6c332bd | 838 | update_waiting = FALSE; |
0756eb3c PH |
839 | return -1; |
840 | } | |
841 | ||
842 | /* Handle other errors in obtaining an SMTP response by returning -1. This | |
843 | will cause all the addresses to be deferred. Restore the SMTP command in | |
844 | big_buffer for which we are checking the response, so the error message | |
845 | makes sense. */ | |
846 | ||
847 | else if (errno != 0 || buffer[0] == 0) | |
848 | { | |
849 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", | |
850 | transport_rcpt_address(addr, include_affixes)); | |
851 | return -2; | |
852 | } | |
853 | ||
854 | /* Handle SMTP permanent and temporary response codes. */ | |
855 | ||
856 | else | |
857 | { | |
858 | addr->message = | |
447d236c | 859 | string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: " |
c562fd30 JH |
860 | "%s", transport_rcpt_address(addr, include_affixes), |
861 | string_printing(buffer)); | |
447d236c | 862 | setflag(addr, af_pass_message); |
c562fd30 | 863 | msglog_line(host, addr->message); |
0756eb3c PH |
864 | |
865 | /* The response was 5xx */ | |
866 | ||
867 | if (buffer[0] == '5') | |
868 | { | |
869 | addr->transport_return = FAIL; | |
870 | yield |= 2; | |
871 | } | |
872 | ||
873 | /* The response was 4xx */ | |
874 | ||
875 | else | |
876 | { | |
0756eb3c PH |
877 | addr->transport_return = DEFER; |
878 | addr->basic_errno = ERRNO_RCPT4XX; | |
e97957bc | 879 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
0756eb3c | 880 | |
c562fd30 JH |
881 | /* Log temporary errors if there are more hosts to be tried. |
882 | If not, log this last one in the == line. */ | |
0756eb3c | 883 | |
c562fd30 JH |
884 | if (host->next) |
885 | log_write(0, LOG_MAIN, "H=%s [%s]: %s", host->name, host->address, addr->message); | |
0756eb3c | 886 | |
f6c332bd PH |
887 | /* Do not put this message on the list of those waiting for specific |
888 | hosts, as otherwise it is likely to be tried too often. */ | |
0756eb3c | 889 | |
f6c332bd | 890 | update_waiting = FALSE; |
0756eb3c | 891 | |
48c7f9e2 PH |
892 | /* Add a retry item for the address so that it doesn't get tried again |
893 | too soon. If address_retry_include_sender is true, add the sender address | |
894 | to the retry key. */ | |
0756eb3c | 895 | |
48c7f9e2 PH |
896 | if (address_retry_include_sender) |
897 | { | |
898 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, | |
899 | sender_address); | |
900 | retry_add_item(addr, altkey, 0); | |
901 | } | |
902 | else retry_add_item(addr, addr->address_retry_key, 0); | |
0756eb3c PH |
903 | } |
904 | } | |
905 | } /* Loop for next RCPT response */ | |
906 | ||
907 | /* Update where to start at for the next block of responses, unless we | |
908 | have already handled all the addresses. */ | |
909 | ||
910 | if (addr != NULL) *sync_addr = addr->next; | |
911 | ||
912 | /* Handle a response to DATA. If we have not had any good recipients, either | |
913 | previously or in this block, the response is ignored. */ | |
914 | ||
915 | if (pending_DATA != 0 && | |
916 | !smtp_read_response(inblock, buffer, buffsize, '3', timeout)) | |
917 | { | |
918 | int code; | |
919 | uschar *msg; | |
447d236c | 920 | BOOL pass_message; |
e97957bc PH |
921 | if (pending_DATA > 0 || (yield & 1) != 0) |
922 | { | |
923 | if (errno == 0 && buffer[0] == '4') | |
924 | { | |
925 | errno = ERRNO_DATA4XX; | |
926 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
927 | } | |
928 | return -3; | |
929 | } | |
447d236c | 930 | (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message); |
0756eb3c PH |
931 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " |
932 | "is in use and there were no good recipients\n", msg); | |
933 | } | |
934 | ||
935 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if | |
936 | present) received 3xx. If any RCPTs were handled and yielded anything other | |
937 | than 4xx, yield will be set non-zero. */ | |
938 | ||
939 | return yield; | |
940 | } | |
941 | ||
942 | ||
943 | ||
fcc8e047 JH |
944 | /* Do the client side of smtp-level authentication */ |
945 | /* | |
946 | Arguments: | |
947 | buffer EHLO response from server (gets overwritten) | |
948 | addrlist chain of potential addresses to deliver | |
949 | host host to deliver to | |
950 | ob transport options | |
951 | ibp, obp comms channel control blocks | |
952 | ||
953 | Returns: | |
954 | OK Success, or failed (but not required): global "smtp_authenticated" set | |
955 | DEFER Failed authentication (and was required) | |
956 | ERROR Internal problem | |
957 | ||
958 | FAIL_SEND Failed communications - transmit | |
959 | FAIL - response | |
960 | */ | |
961 | ||
962 | int | |
963 | smtp_auth(uschar *buffer, unsigned bufsize, address_item *addrlist, host_item *host, | |
964 | smtp_transport_options_block *ob, BOOL is_esmtp, | |
965 | smtp_inblock *ibp, smtp_outblock *obp) | |
966 | { | |
a7538db1 JH |
967 | int require_auth; |
968 | uschar *fail_reason = US"server did not advertise AUTH support"; | |
fcc8e047 | 969 | |
a7538db1 JH |
970 | smtp_authenticated = FALSE; |
971 | client_authenticator = client_authenticated_id = client_authenticated_sender = NULL; | |
5130845b | 972 | require_auth = verify_check_given_host(&ob->hosts_require_auth, host); |
fcc8e047 | 973 | |
a7538db1 JH |
974 | if (is_esmtp && !regex_AUTH) regex_AUTH = |
975 | regex_must_compile(US"\\n250[\\s\\-]AUTH\\s+([\\-\\w\\s]+)(?:\\n|$)", | |
976 | FALSE, TRUE); | |
fcc8e047 | 977 | |
a7538db1 JH |
978 | if (is_esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1)) |
979 | { | |
980 | uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]); | |
981 | expand_nmax = -1; /* reset */ | |
fcc8e047 | 982 | |
a7538db1 JH |
983 | /* Must not do this check until after we have saved the result of the |
984 | regex match above. */ | |
fcc8e047 | 985 | |
a7538db1 | 986 | if (require_auth == OK || |
5130845b | 987 | verify_check_given_host(&ob->hosts_try_auth, host) == OK) |
a7538db1 JH |
988 | { |
989 | auth_instance *au; | |
990 | fail_reason = US"no common mechanisms were found"; | |
fcc8e047 | 991 | |
a7538db1 | 992 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); |
fcc8e047 | 993 | |
a7538db1 JH |
994 | /* Scan the configured authenticators looking for one which is configured |
995 | for use as a client, which is not suppressed by client_condition, and | |
996 | whose name matches an authentication mechanism supported by the server. | |
997 | If one is found, attempt to authenticate by calling its client function. | |
998 | */ | |
fcc8e047 | 999 | |
a7538db1 JH |
1000 | for (au = auths; !smtp_authenticated && au != NULL; au = au->next) |
1001 | { | |
1002 | uschar *p = names; | |
1003 | if (!au->client || | |
1004 | (au->client_condition != NULL && | |
1005 | !expand_check_condition(au->client_condition, au->name, | |
1006 | US"client authenticator"))) | |
1007 | { | |
1008 | DEBUG(D_transport) debug_printf("skipping %s authenticator: %s\n", | |
1009 | au->name, | |
1010 | (au->client)? "client_condition is false" : | |
1011 | "not configured as a client"); | |
1012 | continue; | |
1013 | } | |
fcc8e047 | 1014 | |
a7538db1 | 1015 | /* Loop to scan supported server mechanisms */ |
fcc8e047 | 1016 | |
a7538db1 JH |
1017 | while (*p != 0) |
1018 | { | |
1019 | int rc; | |
1020 | int len = Ustrlen(au->public_name); | |
1021 | while (isspace(*p)) p++; | |
fcc8e047 | 1022 | |
a7538db1 JH |
1023 | if (strncmpic(au->public_name, p, len) != 0 || |
1024 | (p[len] != 0 && !isspace(p[len]))) | |
1025 | { | |
1026 | while (*p != 0 && !isspace(*p)) p++; | |
1027 | continue; | |
1028 | } | |
fcc8e047 | 1029 | |
a7538db1 JH |
1030 | /* Found data for a listed mechanism. Call its client entry. Set |
1031 | a flag in the outblock so that data is overwritten after sending so | |
1032 | that reflections don't show it. */ | |
fcc8e047 | 1033 | |
a7538db1 JH |
1034 | fail_reason = US"authentication attempt(s) failed"; |
1035 | obp->authenticating = TRUE; | |
1036 | rc = (au->info->clientcode)(au, ibp, obp, | |
1037 | ob->command_timeout, buffer, bufsize); | |
1038 | obp->authenticating = FALSE; | |
1039 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", | |
1040 | au->name, rc); | |
fcc8e047 | 1041 | |
a7538db1 JH |
1042 | /* A temporary authentication failure must hold up delivery to |
1043 | this host. After a permanent authentication failure, we carry on | |
1044 | to try other authentication methods. If all fail hard, try to | |
1045 | deliver the message unauthenticated unless require_auth was set. */ | |
fcc8e047 | 1046 | |
a7538db1 JH |
1047 | switch(rc) |
1048 | { | |
1049 | case OK: | |
1050 | smtp_authenticated = TRUE; /* stops the outer loop */ | |
1051 | client_authenticator = au->name; | |
1052 | if (au->set_client_id != NULL) | |
1053 | client_authenticated_id = expand_string(au->set_client_id); | |
1054 | break; | |
1055 | ||
1056 | /* Failure after writing a command */ | |
1057 | ||
1058 | case FAIL_SEND: | |
1059 | return FAIL_SEND; | |
1060 | ||
1061 | /* Failure after reading a response */ | |
1062 | ||
1063 | case FAIL: | |
1064 | if (errno != 0 || buffer[0] != '5') return FAIL; | |
1065 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", | |
1066 | au->name, host->name, host->address, buffer); | |
1067 | break; | |
1068 | ||
1069 | /* Failure by some other means. In effect, the authenticator | |
1070 | decided it wasn't prepared to handle this case. Typically this | |
1071 | is the result of "fail" in an expansion string. Do we need to | |
1072 | log anything here? Feb 2006: a message is now put in the buffer | |
1073 | if logging is required. */ | |
1074 | ||
1075 | case CANCELLED: | |
1076 | if (*buffer != 0) | |
1077 | log_write(0, LOG_MAIN, "%s authenticator cancelled " | |
1078 | "authentication H=%s [%s] %s", au->name, host->name, | |
1079 | host->address, buffer); | |
1080 | break; | |
1081 | ||
1082 | /* Internal problem, message in buffer. */ | |
1083 | ||
1084 | case ERROR: | |
168dec3b JH |
1085 | set_errno(addrlist, ERRNO_AUTHPROB, string_copy(buffer), |
1086 | DEFER, FALSE, NULL); | |
a7538db1 JH |
1087 | return ERROR; |
1088 | } | |
fcc8e047 | 1089 | |
a7538db1 JH |
1090 | break; /* If not authenticated, try next authenticator */ |
1091 | } /* Loop for scanning supported server mechanisms */ | |
1092 | } /* Loop for further authenticators */ | |
fcc8e047 | 1093 | } |
a7538db1 | 1094 | } |
fcc8e047 | 1095 | |
a7538db1 | 1096 | /* If we haven't authenticated, but are required to, give up. */ |
fcc8e047 | 1097 | |
a7538db1 JH |
1098 | if (require_auth == OK && !smtp_authenticated) |
1099 | { | |
1100 | set_errno(addrlist, ERRNO_AUTHFAIL, | |
1101 | string_sprintf("authentication required but %s", fail_reason), DEFER, | |
c562fd30 | 1102 | FALSE, NULL); |
a7538db1 JH |
1103 | return DEFER; |
1104 | } | |
4d8d62b9 | 1105 | |
a7538db1 | 1106 | return OK; |
fcc8e047 JH |
1107 | } |
1108 | ||
1109 | ||
1110 | /* Construct AUTH appendix string for MAIL TO */ | |
1111 | /* | |
1112 | Arguments | |
1113 | buffer to build string | |
1114 | addrlist chain of potential addresses to deliver | |
1115 | ob transport options | |
1116 | ||
1117 | Globals smtp_authenticated | |
1118 | client_authenticated_sender | |
1119 | Return True on error, otherwise buffer has (possibly empty) terminated string | |
1120 | */ | |
1121 | ||
1122 | BOOL | |
1123 | smtp_mail_auth_str(uschar *buffer, unsigned bufsize, address_item *addrlist, | |
1124 | smtp_transport_options_block *ob) | |
1125 | { | |
1126 | uschar *local_authenticated_sender = authenticated_sender; | |
1127 | ||
1128 | #ifdef notdef | |
1129 | debug_printf("smtp_mail_auth_str: as<%s> os<%s> SA<%s>\n", authenticated_sender, ob->authenticated_sender, smtp_authenticated?"Y":"N"); | |
1130 | #endif | |
1131 | ||
1132 | if (ob->authenticated_sender != NULL) | |
1133 | { | |
1134 | uschar *new = expand_string(ob->authenticated_sender); | |
1135 | if (new == NULL) | |
1136 | { | |
1137 | if (!expand_string_forcedfail) | |
1138 | { | |
1139 | uschar *message = string_sprintf("failed to expand " | |
1140 | "authenticated_sender: %s", expand_string_message); | |
168dec3b | 1141 | set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL); |
fcc8e047 JH |
1142 | return TRUE; |
1143 | } | |
1144 | } | |
1145 | else if (new[0] != 0) local_authenticated_sender = new; | |
1146 | } | |
1147 | ||
1148 | /* Add the authenticated sender address if present */ | |
1149 | ||
1150 | if ((smtp_authenticated || ob->authenticated_sender_force) && | |
1151 | local_authenticated_sender != NULL) | |
1152 | { | |
1153 | string_format(buffer, bufsize, " AUTH=%s", | |
1154 | auth_xtextencode(local_authenticated_sender, | |
1155 | Ustrlen(local_authenticated_sender))); | |
1156 | client_authenticated_sender = string_copy(local_authenticated_sender); | |
1157 | } | |
1158 | else | |
1159 | *buffer= 0; | |
1160 | ||
1161 | return FALSE; | |
1162 | } | |
1163 | ||
1164 | ||
1165 | ||
0e66b3b6 JH |
1166 | #ifdef EXPERIMENTAL_DANE |
1167 | int | |
b8b1b5cb | 1168 | tlsa_lookup(const host_item * host, dns_answer * dnsa, |
0e66b3b6 JH |
1169 | BOOL dane_required, BOOL * dane) |
1170 | { | |
1171 | /* move this out to host.c given the similarity to dns_lookup() ? */ | |
1172 | uschar buffer[300]; | |
55414b25 | 1173 | const uschar * fullname = buffer; |
0e66b3b6 JH |
1174 | |
1175 | /* TLSA lookup string */ | |
1176 | (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name); | |
1177 | ||
1178 | switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname)) | |
1179 | { | |
1180 | case DNS_AGAIN: | |
1181 | return DEFER; /* just defer this TLS'd conn */ | |
1182 | ||
1183 | default: | |
1184 | case DNS_FAIL: | |
1185 | if (dane_required) | |
1186 | { | |
1187 | log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed"); | |
1188 | return FAIL; | |
1189 | } | |
1190 | break; | |
1191 | ||
1192 | case DNS_SUCCEED: | |
1193 | if (!dns_is_secure(dnsa)) | |
1194 | { | |
1195 | log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC"); | |
1196 | return DEFER; | |
1197 | } | |
1198 | *dane = TRUE; | |
1199 | break; | |
1200 | } | |
1201 | return OK; | |
1202 | } | |
1203 | #endif | |
1204 | ||
1205 | ||
0756eb3c PH |
1206 | /************************************************* |
1207 | * Deliver address list to given host * | |
1208 | *************************************************/ | |
1209 | ||
1210 | /* If continue_hostname is not null, we get here only when continuing to | |
1211 | deliver down an existing channel. The channel was passed as the standard | |
6c512171 PH |
1212 | input. TLS is never active on a passed channel; the previous process always |
1213 | closes it down before passing the connection on. | |
0756eb3c PH |
1214 | |
1215 | Otherwise, we have to make a connection to the remote host, and do the | |
1216 | initial protocol exchange. | |
1217 | ||
1218 | When running as an MUA wrapper, if the sender or any recipient is rejected, | |
1219 | temporarily or permanently, we force failure for all recipients. | |
1220 | ||
1221 | Arguments: | |
1222 | addrlist chain of potential addresses to deliver; only those whose | |
1223 | transport_return field is set to PENDING_DEFER are currently | |
1224 | being processed; others should be skipped - they have either | |
1225 | been delivered to an earlier host or IP address, or been | |
1226 | failed by one of them. | |
1227 | host host to deliver to | |
1228 | host_af AF_INET or AF_INET6 | |
2d280592 | 1229 | port default TCP/IP port to use, in host byte order |
0756eb3c PH |
1230 | interface interface to bind to, or NULL |
1231 | tblock transport instance block | |
0756eb3c PH |
1232 | message_defer set TRUE if yield is OK, but all addresses were deferred |
1233 | because of a non-recipient, non-host failure, that is, a | |
1234 | 4xx response to MAIL FROM, DATA, or ".". This is a defer | |
1235 | that is specific to the message. | |
1236 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for | |
1237 | a second attempt after TLS initialization fails | |
1238 | ||
1239 | Returns: OK - the connection was made and the delivery attempted; | |
1240 | the result for each address is in its data block. | |
1241 | DEFER - the connection could not be made, or something failed | |
1242 | while setting up the SMTP session, or there was a | |
1243 | non-message-specific error, such as a timeout. | |
1244 | ERROR - a filter command is specified for this transport, | |
1245 | and there was a problem setting it up; OR helo_data | |
1246 | or add_headers or authenticated_sender is specified | |
1247 | for this transport, and the string failed to expand | |
1248 | */ | |
1249 | ||
1250 | static int | |
1251 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port, | |
d427a7f9 | 1252 | uschar *interface, transport_instance *tblock, |
0756eb3c PH |
1253 | BOOL *message_defer, BOOL suppress_tls) |
1254 | { | |
1255 | address_item *addr; | |
1256 | address_item *sync_addr; | |
1257 | address_item *first_addr = addrlist; | |
1258 | int yield = OK; | |
1259 | int address_count; | |
1260 | int save_errno; | |
1261 | int rc; | |
1262 | time_t start_delivery_time = time(NULL); | |
1263 | smtp_transport_options_block *ob = | |
1264 | (smtp_transport_options_block *)(tblock->options_block); | |
1265 | BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0; | |
061b7ebd | 1266 | BOOL smtps = strcmpic(ob->protocol, US"smtps") == 0; |
0756eb3c PH |
1267 | BOOL ok = FALSE; |
1268 | BOOL send_rset = TRUE; | |
1269 | BOOL send_quit = TRUE; | |
1270 | BOOL setting_up = TRUE; | |
1271 | BOOL completed_address = FALSE; | |
1272 | BOOL esmtp = TRUE; | |
1273 | BOOL pending_MAIL; | |
447d236c | 1274 | BOOL pass_message = FALSE; |
8ccd00b1 | 1275 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
1276 | BOOL prdr_offered = FALSE; |
1277 | BOOL prdr_active; | |
1278 | #endif | |
6c1c3d1d | 1279 | BOOL dsn_all_lasthop = TRUE; |
0e66b3b6 JH |
1280 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
1281 | BOOL dane = FALSE; | |
6ebd79ec | 1282 | BOOL dane_required; |
0e66b3b6 JH |
1283 | dns_answer tlsa_dnsa; |
1284 | #endif | |
0756eb3c PH |
1285 | smtp_inblock inblock; |
1286 | smtp_outblock outblock; | |
1287 | int max_rcpt = tblock->max_addresses; | |
f1513293 | 1288 | uschar *igquotstr = US""; |
41c7c167 | 1289 | uschar *helo_data = NULL; |
0756eb3c PH |
1290 | uschar *message = NULL; |
1291 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; | |
1292 | uschar *p; | |
1293 | uschar buffer[4096]; | |
1294 | uschar inbuffer[4096]; | |
98470202 | 1295 | uschar outbuffer[4096]; |
0756eb3c PH |
1296 | |
1297 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ | |
1298 | ||
1299 | *message_defer = FALSE; | |
1300 | smtp_command = US"initial connection"; | |
1301 | if (max_rcpt == 0) max_rcpt = 999999; | |
1302 | ||
1303 | /* Set up the buffer for reading SMTP response packets. */ | |
1304 | ||
1305 | inblock.buffer = inbuffer; | |
1306 | inblock.buffersize = sizeof(inbuffer); | |
1307 | inblock.ptr = inbuffer; | |
1308 | inblock.ptrend = inbuffer; | |
1309 | ||
1310 | /* Set up the buffer for holding SMTP commands while pipelining */ | |
1311 | ||
1312 | outblock.buffer = outbuffer; | |
1313 | outblock.buffersize = sizeof(outbuffer); | |
1314 | outblock.ptr = outbuffer; | |
1315 | outblock.cmd_count = 0; | |
1316 | outblock.authenticating = FALSE; | |
1317 | ||
6c512171 PH |
1318 | /* Reset the parameters of a TLS session. */ |
1319 | ||
817d9f57 JH |
1320 | tls_out.bits = 0; |
1321 | tls_out.cipher = NULL; /* the one we may use for this transport */ | |
9d1c15ef JH |
1322 | tls_out.ourcert = NULL; |
1323 | tls_out.peercert = NULL; | |
817d9f57 JH |
1324 | tls_out.peerdn = NULL; |
1325 | #if defined(SUPPORT_TLS) && !defined(USE_GNUTLS) | |
1326 | tls_out.sni = NULL; | |
5b456975 | 1327 | #endif |
018058b2 | 1328 | tls_out.ocsp = OCSP_NOT_REQ; |
6c512171 | 1329 | |
35aba663 JH |
1330 | /* Flip the legacy TLS-related variables over to the outbound set in case |
1331 | they're used in the context of the transport. Don't bother resetting | |
1332 | afterward as we're in a subprocess. */ | |
1333 | ||
1334 | tls_modify_variables(&tls_out); | |
1335 | ||
061b7ebd PP |
1336 | #ifndef SUPPORT_TLS |
1337 | if (smtps) | |
1338 | { | |
168dec3b JH |
1339 | set_errno(addrlist, ERRNO_TLSFAILURE, US"TLS support not available", |
1340 | DEFER, FALSE, NULL); | |
018058b2 | 1341 | return ERROR; |
061b7ebd PP |
1342 | } |
1343 | #endif | |
1344 | ||
0756eb3c PH |
1345 | /* Make a connection to the host if this isn't a continued delivery, and handle |
1346 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled | |
1347 | specially so they can be identified for retries. */ | |
1348 | ||
1349 | if (continue_hostname == NULL) | |
1350 | { | |
a7538db1 | 1351 | /* This puts port into host->port */ |
0756eb3c PH |
1352 | inblock.sock = outblock.sock = |
1353 | smtp_connect(host, host_af, port, interface, ob->connect_timeout, | |
a7538db1 | 1354 | ob->keepalive, ob->dscp |
774ef2d7 JH |
1355 | #ifdef EXPERIMENTAL_EVENT |
1356 | , tblock->event_action | |
a7538db1 JH |
1357 | #endif |
1358 | ); | |
4311097e | 1359 | |
0756eb3c PH |
1360 | if (inblock.sock < 0) |
1361 | { | |
1362 | set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno, | |
c562fd30 | 1363 | NULL, DEFER, FALSE, NULL); |
0756eb3c PH |
1364 | return DEFER; |
1365 | } | |
1366 | ||
0e66b3b6 JH |
1367 | #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE) |
1368 | { | |
0e66b3b6 JH |
1369 | tls_out.dane_verified = FALSE; |
1370 | tls_out.tlsa_usage = 0; | |
1371 | ||
5130845b | 1372 | dane_required = verify_check_given_host(&ob->hosts_require_dane, host) == OK; |
0e66b3b6 JH |
1373 | |
1374 | if (host->dnssec == DS_YES) | |
1375 | { | |
1376 | if( dane_required | |
5130845b | 1377 | || verify_check_given_host(&ob->hosts_try_dane, host) == OK |
0e66b3b6 JH |
1378 | ) |
1379 | if ((rc = tlsa_lookup(host, &tlsa_dnsa, dane_required, &dane)) != OK) | |
1380 | return rc; | |
1381 | } | |
1382 | else if (dane_required) | |
1383 | { | |
1384 | log_write(0, LOG_MAIN, "DANE error: %s lookup not DNSSEC", host->name); | |
1385 | return FAIL; | |
1386 | } | |
1387 | ||
1388 | if (dane) | |
1389 | ob->tls_tempfail_tryclear = FALSE; | |
1390 | } | |
1391 | #endif /*DANE*/ | |
1392 | ||
41c7c167 PH |
1393 | /* Expand the greeting message while waiting for the initial response. (Makes |
1394 | sense if helo_data contains ${lookup dnsdb ...} stuff). The expansion is | |
1395 | delayed till here so that $sending_interface and $sending_port are set. */ | |
1396 | ||
1397 | helo_data = expand_string(ob->helo_data); | |
1398 | ||
0756eb3c PH |
1399 | /* The first thing is to wait for an initial OK response. The dreaded "goto" |
1400 | is nevertheless a reasonably clean way of programming this kind of logic, | |
1401 | where you want to escape on any error. */ | |
1402 | ||
061b7ebd PP |
1403 | if (!smtps) |
1404 | { | |
1405 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1406 | ob->command_timeout)) goto RESPONSE_FAILED; | |
0756eb3c | 1407 | |
774ef2d7 | 1408 | #ifdef EXPERIMENTAL_EVENT |
b30275b8 | 1409 | { |
805c9d53 JH |
1410 | uschar * s; |
1411 | lookup_dnssec_authenticated = host->dnssec==DS_YES ? US"yes" | |
1412 | : host->dnssec==DS_NO ? US"no" : NULL; | |
1413 | s = event_raise(tblock->event_action, US"smtp:connect", buffer); | |
b30275b8 | 1414 | if (s) |
a7538db1 | 1415 | { |
168dec3b | 1416 | set_errno(addrlist, ERRNO_EXPANDFAIL, |
b30275b8 JH |
1417 | string_sprintf("deferred by smtp:connect event expansion: %s", s), |
1418 | DEFER, FALSE, NULL); | |
a7538db1 JH |
1419 | yield = DEFER; |
1420 | goto SEND_QUIT; | |
1421 | } | |
b30275b8 | 1422 | } |
a7538db1 JH |
1423 | #endif |
1424 | ||
061b7ebd PP |
1425 | /* Now check if the helo_data expansion went well, and sign off cleanly if |
1426 | it didn't. */ | |
41c7c167 | 1427 | |
061b7ebd PP |
1428 | if (helo_data == NULL) |
1429 | { | |
1430 | uschar *message = string_sprintf("failed to expand helo_data: %s", | |
1431 | expand_string_message); | |
168dec3b | 1432 | set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL); |
061b7ebd PP |
1433 | yield = DEFER; |
1434 | goto SEND_QUIT; | |
1435 | } | |
41c7c167 PH |
1436 | } |
1437 | ||
0756eb3c PH |
1438 | /** Debugging without sending a message |
1439 | addrlist->transport_return = DEFER; | |
1440 | goto SEND_QUIT; | |
1441 | **/ | |
1442 | ||
1443 | /* Errors that occur after this point follow an SMTP command, which is | |
1444 | left in big_buffer by smtp_write_command() for use in error messages. */ | |
1445 | ||
1446 | smtp_command = big_buffer; | |
1447 | ||
1448 | /* Tell the remote who we are... | |
1449 | ||
1450 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the | |
1451 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the | |
1452 | greeting is of this form. The assumption was that the far end supports it | |
1453 | properly... but experience shows that there are some that give 5xx responses, | |
1454 | even though the banner includes "ESMTP" (there's a bloody-minded one that | |
1455 | says "ESMTP not spoken here"). Cope with that case. | |
1456 | ||
1457 | September 2000: Time has passed, and it seems reasonable now to always send | |
1458 | EHLO at the start. It is also convenient to make the change while installing | |
1459 | the TLS stuff. | |
1460 | ||
1461 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" | |
1462 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There | |
1463 | would be no way to send out the mails, so there is now a host list | |
1464 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the | |
1465 | PIPELINING problem as well. Maybe it can also be useful to cure other | |
1466 | problems with broken servers. | |
1467 | ||
1468 | Exim originally sent "Helo" at this point and ran for nearly a year that way. | |
1469 | Then somebody tried it with a Microsoft mailer... It seems that all other | |
1470 | mailers use upper case for some reason (the RFC is quite clear about case | |
1471 | independence) so, for peace of mind, I gave in. */ | |
1472 | ||
5130845b | 1473 | esmtp = verify_check_given_host(&ob->hosts_avoid_esmtp, host) != OK; |
0756eb3c | 1474 | |
061b7ebd PP |
1475 | /* Alas; be careful, since this goto is not an error-out, so conceivably |
1476 | we might set data between here and the target which we assume to exist | |
1477 | and be usable. I can see this coming back to bite us. */ | |
a7538db1 | 1478 | #ifdef SUPPORT_TLS |
061b7ebd PP |
1479 | if (smtps) |
1480 | { | |
1481 | tls_offered = TRUE; | |
1482 | suppress_tls = FALSE; | |
1483 | ob->tls_tempfail_tryclear = FALSE; | |
1484 | smtp_command = US"SSL-on-connect"; | |
1485 | goto TLS_NEGOTIATE; | |
1486 | } | |
a7538db1 | 1487 | #endif |
061b7ebd | 1488 | |
0756eb3c PH |
1489 | if (esmtp) |
1490 | { | |
1491 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", | |
1492 | lmtp? "LHLO" : "EHLO", helo_data) < 0) | |
1493 | goto SEND_FAILED; | |
1494 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1495 | ob->command_timeout)) | |
1496 | { | |
1497 | if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED; | |
1498 | esmtp = FALSE; | |
1499 | } | |
1500 | } | |
1501 | else | |
1502 | { | |
1503 | DEBUG(D_transport) | |
1504 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
1505 | } | |
1506 | ||
1507 | if (!esmtp) | |
1508 | { | |
1509 | if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0) | |
1510 | goto SEND_FAILED; | |
1511 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1512 | ob->command_timeout)) goto RESPONSE_FAILED; | |
1513 | } | |
1514 | ||
f1513293 PH |
1515 | /* Set IGNOREQUOTA if the response to LHLO specifies support and the |
1516 | lmtp_ignore_quota option was set. */ | |
1517 | ||
1518 | igquotstr = (lmtp && ob->lmtp_ignore_quota && | |
1519 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1520 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; | |
1521 | ||
0756eb3c PH |
1522 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ |
1523 | ||
a7538db1 | 1524 | #ifdef SUPPORT_TLS |
0756eb3c PH |
1525 | tls_offered = esmtp && |
1526 | pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0, | |
1527 | PCRE_EOPT, NULL, 0) >= 0; | |
a7538db1 | 1528 | #endif |
fd98a5c6 | 1529 | |
a7538db1 | 1530 | #ifndef DISABLE_PRDR |
5130845b JH |
1531 | prdr_offered = esmtp |
1532 | && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(buffer), 0, | |
1533 | PCRE_EOPT, NULL, 0) >= 0 | |
1534 | && verify_check_given_host(&ob->hosts_try_prdr, host) == OK; | |
fd98a5c6 JH |
1535 | |
1536 | if (prdr_offered) | |
1537 | {DEBUG(D_transport) debug_printf("PRDR usable\n");} | |
a7538db1 | 1538 | #endif |
0756eb3c PH |
1539 | } |
1540 | ||
1541 | /* For continuing deliveries down the same channel, the socket is the standard | |
1542 | input, and we don't need to redo EHLO here (but may need to do so for TLS - see | |
1543 | below). Set up the pointer to where subsequent commands will be left, for | |
1544 | error messages. Note that smtp_use_size and smtp_use_pipelining will have been | |
1545 | set from the command line if they were set in the process that passed the | |
1546 | connection on. */ | |
1547 | ||
1548 | else | |
1549 | { | |
1550 | inblock.sock = outblock.sock = fileno(stdin); | |
1551 | smtp_command = big_buffer; | |
4311097e | 1552 | host->port = port; /* Record the port that was used */ |
0756eb3c PH |
1553 | } |
1554 | ||
1555 | /* If TLS is available on this connection, whether continued or not, attempt to | |
1556 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, | |
1557 | send another EHLO - the server may give a different answer in secure mode. We | |
1558 | use a separate buffer for reading the response to STARTTLS so that if it is | |
1559 | negative, the original EHLO data is available for subsequent analysis, should | |
1560 | the client not be required to use TLS. If the response is bad, copy the buffer | |
1561 | for error analysis. */ | |
1562 | ||
1563 | #ifdef SUPPORT_TLS | |
5130845b JH |
1564 | if ( tls_offered |
1565 | && !suppress_tls | |
1566 | && verify_check_given_host(&ob->hosts_avoid_tls, host) != OK) | |
0756eb3c PH |
1567 | { |
1568 | uschar buffer2[4096]; | |
1569 | if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0) | |
1570 | goto SEND_FAILED; | |
1571 | ||
1572 | /* If there is an I/O error, transmission of this message is deferred. If | |
1573 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is | |
1574 | false, we also defer. However, if there is a temporary rejection of STARTTLS | |
1575 | and tls_tempfail_tryclear is true, or if there is an outright rejection of | |
1576 | STARTTLS, we carry on. This means we will try to send the message in clear, | |
1577 | unless the host is in hosts_require_tls (tested below). */ | |
1578 | ||
1579 | if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2', | |
1580 | ob->command_timeout)) | |
1581 | { | |
0756eb3c PH |
1582 | if (errno != 0 || buffer2[0] == 0 || |
1583 | (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)) | |
0dda4340 TK |
1584 | { |
1585 | Ustrncpy(buffer, buffer2, sizeof(buffer)); | |
0756eb3c | 1586 | goto RESPONSE_FAILED; |
0dda4340 | 1587 | } |
0756eb3c PH |
1588 | } |
1589 | ||
1590 | /* STARTTLS accepted: try to negotiate a TLS session. */ | |
1591 | ||
1592 | else | |
061b7ebd | 1593 | TLS_NEGOTIATE: |
0756eb3c | 1594 | { |
0e66b3b6 JH |
1595 | int rc = tls_client_start(inblock.sock, host, addrlist, tblock |
1596 | # ifdef EXPERIMENTAL_DANE | |
1597 | , dane ? &tlsa_dnsa : NULL | |
1598 | # endif | |
1599 | ); | |
0756eb3c PH |
1600 | |
1601 | /* TLS negotiation failed; give an error. From outside, this function may | |
1602 | be called again to try in clear on a new connection, if the options permit | |
1603 | it for this host. */ | |
1604 | ||
1605 | if (rc != OK) | |
1606 | { | |
6ebd79ec JH |
1607 | # ifdef EXPERIMENTAL_DANE |
1608 | if (rc == DEFER && dane && !dane_required) | |
1609 | { | |
1610 | log_write(0, LOG_MAIN, "DANE attempt failed;" | |
1611 | " trying CA-root TLS to %s [%s] (not in hosts_require_dane)", | |
1612 | host->name, host->address); | |
1613 | dane = FALSE; | |
1614 | goto TLS_NEGOTIATE; | |
1615 | } | |
1616 | # endif | |
1617 | ||
0756eb3c PH |
1618 | save_errno = ERRNO_TLSFAILURE; |
1619 | message = US"failure while setting up TLS session"; | |
1620 | send_quit = FALSE; | |
1621 | goto TLS_FAILED; | |
1622 | } | |
1623 | ||
1624 | /* TLS session is set up */ | |
1625 | ||
1626 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
5ca2a9a1 PH |
1627 | if (addr->transport_return == PENDING_DEFER) |
1628 | { | |
817d9f57 | 1629 | addr->cipher = tls_out.cipher; |
9d1c15ef JH |
1630 | addr->ourcert = tls_out.ourcert; |
1631 | addr->peercert = tls_out.peercert; | |
817d9f57 | 1632 | addr->peerdn = tls_out.peerdn; |
018058b2 | 1633 | addr->ocsp = tls_out.ocsp; |
5ca2a9a1 | 1634 | } |
0756eb3c PH |
1635 | } |
1636 | } | |
1637 | ||
061b7ebd PP |
1638 | /* if smtps, we'll have smtp_command set to something else; always safe to |
1639 | reset it here. */ | |
1640 | smtp_command = big_buffer; | |
1641 | ||
41c7c167 PH |
1642 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. If |
1643 | helo_data is null, we are dealing with a connection that was passed from | |
1644 | another process, and so we won't have expanded helo_data above. We have to | |
1645 | expand it here. $sending_ip_address and $sending_port are set up right at the | |
1646 | start of the Exim process (in exim.c). */ | |
0756eb3c | 1647 | |
817d9f57 | 1648 | if (tls_out.active >= 0) |
0756eb3c | 1649 | { |
061b7ebd | 1650 | char *greeting_cmd; |
41c7c167 PH |
1651 | if (helo_data == NULL) |
1652 | { | |
1653 | helo_data = expand_string(ob->helo_data); | |
1654 | if (helo_data == NULL) | |
1655 | { | |
1656 | uschar *message = string_sprintf("failed to expand helo_data: %s", | |
1657 | expand_string_message); | |
168dec3b | 1658 | set_errno(addrlist, ERRNO_EXPANDFAIL, message, DEFER, FALSE, NULL); |
41c7c167 PH |
1659 | yield = DEFER; |
1660 | goto SEND_QUIT; | |
1661 | } | |
1662 | } | |
1663 | ||
0d0e4455 | 1664 | /* For SMTPS we need to wait for the initial OK response. */ |
061b7ebd PP |
1665 | if (smtps) |
1666 | { | |
1667 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1668 | ob->command_timeout)) goto RESPONSE_FAILED; | |
0d0e4455 PP |
1669 | } |
1670 | ||
1671 | if (esmtp) | |
1672 | greeting_cmd = "EHLO"; | |
1673 | else | |
1674 | { | |
1675 | greeting_cmd = "HELO"; | |
1676 | DEBUG(D_transport) | |
1677 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
061b7ebd PP |
1678 | } |
1679 | ||
1680 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", | |
1681 | lmtp? "LHLO" : greeting_cmd, helo_data) < 0) | |
0756eb3c PH |
1682 | goto SEND_FAILED; |
1683 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1684 | ob->command_timeout)) | |
1685 | goto RESPONSE_FAILED; | |
1686 | } | |
1687 | ||
1688 | /* If the host is required to use a secure channel, ensure that we | |
1689 | have one. */ | |
1690 | ||
0e66b3b6 JH |
1691 | else if ( |
1692 | # ifdef EXPERIMENTAL_DANE | |
1693 | dane || | |
1694 | # endif | |
5130845b | 1695 | verify_check_given_host(&ob->hosts_require_tls, host) == OK |
7a31d643 | 1696 | ) |
0756eb3c PH |
1697 | { |
1698 | save_errno = ERRNO_TLSREQUIRED; | |
c562fd30 | 1699 | message = string_sprintf("a TLS session is required, but %s", |
0756eb3c PH |
1700 | tls_offered? "an attempt to start TLS failed" : |
1701 | "the server did not offer TLS support"); | |
1702 | goto TLS_FAILED; | |
1703 | } | |
0e66b3b6 | 1704 | #endif /*SUPPORT_TLS*/ |
0756eb3c PH |
1705 | |
1706 | /* If TLS is active, we have just started it up and re-done the EHLO command, | |
1707 | so its response needs to be analyzed. If TLS is not active and this is a | |
1708 | continued session down a previously-used socket, we haven't just done EHLO, so | |
1709 | we skip this. */ | |
1710 | ||
1711 | if (continue_hostname == NULL | |
a7538db1 | 1712 | #ifdef SUPPORT_TLS |
817d9f57 | 1713 | || tls_out.active >= 0 |
a7538db1 | 1714 | #endif |
0756eb3c PH |
1715 | ) |
1716 | { | |
f1513293 PH |
1717 | /* Set for IGNOREQUOTA if the response to LHLO specifies support and the |
1718 | lmtp_ignore_quota option was set. */ | |
1719 | ||
1720 | igquotstr = (lmtp && ob->lmtp_ignore_quota && | |
1721 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1722 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; | |
1723 | ||
0756eb3c PH |
1724 | /* If the response to EHLO specified support for the SIZE parameter, note |
1725 | this, provided size_addition is non-negative. */ | |
1726 | ||
1727 | smtp_use_size = esmtp && ob->size_addition >= 0 && | |
1728 | pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1729 | PCRE_EOPT, NULL, 0) >= 0; | |
1730 | ||
1731 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched | |
c51b8e75 PH |
1732 | the current host, esmtp will be false, so PIPELINING can never be used. If |
1733 | the current host matches hosts_avoid_pipelining, don't do it. */ | |
0756eb3c | 1734 | |
5130845b JH |
1735 | smtp_use_pipelining = esmtp |
1736 | && verify_check_given_host(&ob->hosts_avoid_pipelining, host) != OK | |
1737 | && pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1738 | PCRE_EOPT, NULL, 0) >= 0; | |
0756eb3c PH |
1739 | |
1740 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", | |
1741 | smtp_use_pipelining? "" : "not "); | |
1742 | ||
8ccd00b1 | 1743 | #ifndef DISABLE_PRDR |
5130845b JH |
1744 | prdr_offered = esmtp |
1745 | && pcre_exec(regex_PRDR, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1746 | PCRE_EOPT, NULL, 0) >= 0 | |
1747 | && verify_check_given_host(&ob->hosts_try_prdr, host) == OK; | |
fd98a5c6 JH |
1748 | |
1749 | if (prdr_offered) | |
1750 | {DEBUG(D_transport) debug_printf("PRDR usable\n");} | |
1751 | #endif | |
1752 | ||
6c1c3d1d WB |
1753 | /* Note if the server supports DSN */ |
1754 | smtp_use_dsn = esmtp && pcre_exec(regex_DSN, NULL, CS buffer, (int)Ustrlen(CS buffer), 0, | |
1755 | PCRE_EOPT, NULL, 0) >= 0; | |
1756 | DEBUG(D_transport) debug_printf("use_dsn=%d\n", smtp_use_dsn); | |
6c1c3d1d | 1757 | |
0756eb3c PH |
1758 | /* Note if the response to EHLO specifies support for the AUTH extension. |
1759 | If it has, check that this host is one we want to authenticate to, and do | |
1760 | the business. The host name and address must be available when the | |
1761 | authenticator's client driver is running. */ | |
1762 | ||
fcc8e047 JH |
1763 | switch (yield = smtp_auth(buffer, sizeof(buffer), addrlist, host, |
1764 | ob, esmtp, &inblock, &outblock)) | |
0756eb3c | 1765 | { |
fcc8e047 JH |
1766 | default: goto SEND_QUIT; |
1767 | case OK: break; | |
1768 | case FAIL_SEND: goto SEND_FAILED; | |
1769 | case FAIL: goto RESPONSE_FAILED; | |
0756eb3c PH |
1770 | } |
1771 | } | |
1772 | ||
1773 | /* The setting up of the SMTP call is now complete. Any subsequent errors are | |
1774 | message-specific. */ | |
1775 | ||
1776 | setting_up = FALSE; | |
1777 | ||
1778 | /* If there is a filter command specified for this transport, we can now | |
1779 | set it up. This cannot be done until the identify of the host is known. */ | |
1780 | ||
1781 | if (tblock->filter_command != NULL) | |
1782 | { | |
1783 | BOOL rc; | |
1784 | uschar buffer[64]; | |
1785 | sprintf(CS buffer, "%.50s transport", tblock->name); | |
1786 | rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command, | |
1787 | TRUE, DEFER, addrlist, buffer, NULL); | |
9b989985 | 1788 | transport_filter_timeout = tblock->filter_timeout; |
0756eb3c PH |
1789 | |
1790 | /* On failure, copy the error to all addresses, abandon the SMTP call, and | |
1791 | yield ERROR. */ | |
1792 | ||
1793 | if (!rc) | |
1794 | { | |
447d236c | 1795 | set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER, |
c562fd30 | 1796 | FALSE, NULL); |
0756eb3c PH |
1797 | yield = ERROR; |
1798 | goto SEND_QUIT; | |
1799 | } | |
1800 | } | |
1801 | ||
1802 | ||
1803 | /* For messages that have more than the maximum number of envelope recipients, | |
1804 | we want to send several transactions down the same SMTP connection. (See | |
1805 | comments in deliver.c as to how this reconciles, heuristically, with | |
1806 | remote_max_parallel.) This optimization was added to Exim after the following | |
1807 | code was already working. The simplest way to put it in without disturbing the | |
1808 | code was to use a goto to jump back to this point when there is another | |
1809 | transaction to handle. */ | |
1810 | ||
1811 | SEND_MESSAGE: | |
1812 | sync_addr = first_addr; | |
1813 | address_count = 0; | |
1814 | ok = FALSE; | |
1815 | send_rset = TRUE; | |
1816 | completed_address = FALSE; | |
1817 | ||
1818 | ||
1819 | /* Initiate a message transfer. If we know the receiving MTA supports the SIZE | |
1820 | qualification, send it, adding something to the message size to allow for | |
1821 | imprecision and things that get added en route. Exim keeps the number of lines | |
1822 | in a message, so we can give an accurate value for the original message, but we | |
1823 | need some additional to handle added headers. (Double "." characters don't get | |
1824 | included in the count.) */ | |
1825 | ||
1826 | p = buffer; | |
1827 | *p = 0; | |
1828 | ||
1829 | if (smtp_use_size) | |
1830 | { | |
1831 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition); | |
1832 | while (*p) p++; | |
1833 | } | |
1834 | ||
8ccd00b1 | 1835 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
1836 | prdr_active = FALSE; |
1837 | if (prdr_offered) | |
1838 | { | |
1839 | for (addr = first_addr; addr; addr = addr->next) | |
1840 | if (addr->transport_return == PENDING_DEFER) | |
1841 | { | |
1842 | for (addr = addr->next; addr; addr = addr->next) | |
1843 | if (addr->transport_return == PENDING_DEFER) | |
1844 | { /* at least two recipients to send */ | |
1845 | prdr_active = TRUE; | |
1846 | sprintf(CS p, " PRDR"); p += 5; | |
a7538db1 | 1847 | break; |
fd98a5c6 JH |
1848 | } |
1849 | break; | |
1850 | } | |
1851 | } | |
fd98a5c6 JH |
1852 | #endif |
1853 | ||
6c1c3d1d WB |
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 | } | |
6c1c3d1d | 1883 | |
6b62e899 JH |
1884 | /* If an authenticated_sender override has been specified for this transport |
1885 | instance, expand it. If the expansion is forced to fail, and there was already | |
1886 | an authenticated_sender for this message, the original value will be used. | |
1887 | Other expansion failures are serious. An empty result is ignored, but there is | |
1888 | otherwise no check - this feature is expected to be used with LMTP and other | |
1889 | cases where non-standard addresses (e.g. without domains) might be required. */ | |
1890 | ||
fcc8e047 | 1891 | if (smtp_mail_auth_str(p, sizeof(buffer) - (p-buffer), addrlist, ob)) |
a7538db1 JH |
1892 | { |
1893 | yield = ERROR; | |
1894 | goto SEND_QUIT; | |
1895 | } | |
0756eb3c PH |
1896 | |
1897 | /* From here until we send the DATA command, we can make use of PIPELINING | |
1898 | if the server host supports it. The code has to be able to check the responses | |
1899 | at any point, for when the buffer fills up, so we write it totally generally. | |
1900 | When PIPELINING is off, each command written reports that it has flushed the | |
1901 | buffer. */ | |
1902 | ||
1903 | pending_MAIL = TRUE; /* The block starts with MAIL */ | |
1904 | ||
1905 | rc = smtp_write_command(&outblock, smtp_use_pipelining, | |
1906 | "MAIL FROM:<%s>%s\r\n", return_path, buffer); | |
1907 | mail_command = string_copy(big_buffer); /* Save for later error message */ | |
1908 | ||
1909 | switch(rc) | |
1910 | { | |
1911 | case -1: /* Transmission error */ | |
1912 | goto SEND_FAILED; | |
1913 | ||
1914 | case +1: /* Block was sent */ | |
1915 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
e97957bc PH |
1916 | ob->command_timeout)) |
1917 | { | |
1918 | if (errno == 0 && buffer[0] == '4') | |
1919 | { | |
1920 | errno = ERRNO_MAIL4XX; | |
1921 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
1922 | } | |
1923 | goto RESPONSE_FAILED; | |
1924 | } | |
0756eb3c PH |
1925 | pending_MAIL = FALSE; |
1926 | break; | |
1927 | } | |
1928 | ||
1929 | /* Pass over all the relevant recipient addresses for this host, which are the | |
1930 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send | |
1931 | several before we have to read the responses for those seen so far. This | |
1932 | checking is done by a subroutine because it also needs to be done at the end. | |
1933 | Send only up to max_rcpt addresses at a time, leaving first_addr pointing to | |
1934 | the next one if not all are sent. | |
1935 | ||
1936 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the | |
1937 | last address because we want to abort if any recipients have any kind of | |
1938 | problem, temporary or permanent. We know that all recipient addresses will have | |
1939 | the PENDING_DEFER status, because only one attempt is ever made, and we know | |
1940 | that max_rcpt will be large, so all addresses will be done at once. */ | |
1941 | ||
1942 | for (addr = first_addr; | |
1943 | address_count < max_rcpt && addr != NULL; | |
1944 | addr = addr->next) | |
1945 | { | |
1946 | int count; | |
1947 | BOOL no_flush; | |
1948 | ||
a7538db1 | 1949 | addr->dsn_aware = smtp_use_dsn ? dsn_support_yes : dsn_support_no; |
6c1c3d1d | 1950 | |
0756eb3c PH |
1951 | if (addr->transport_return != PENDING_DEFER) continue; |
1952 | ||
1953 | address_count++; | |
1954 | no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL); | |
1955 | ||
6c1c3d1d WB |
1956 | /* Add any DSN flags to the rcpt command and add to the sent string */ |
1957 | ||
1958 | p = buffer; | |
1959 | *p = 0; | |
1960 | ||
a7538db1 | 1961 | if (smtp_use_dsn && (addr->dsn_flags & rf_dsnlasthop) != 1) |
6c1c3d1d WB |
1962 | { |
1963 | if ((addr->dsn_flags & rf_dsnflags) != 0) | |
1964 | { | |
1965 | int i; | |
1966 | BOOL first = TRUE; | |
45500060 | 1967 | Ustrcpy(p, " NOTIFY="); |
6c1c3d1d WB |
1968 | while (*p) p++; |
1969 | for (i = 0; i < 4; i++) | |
6c1c3d1d WB |
1970 | if ((addr->dsn_flags & rf_list[i]) != 0) |
1971 | { | |
1972 | if (!first) *p++ = ','; | |
1973 | first = FALSE; | |
45500060 | 1974 | Ustrcpy(p, rf_names[i]); |
6c1c3d1d WB |
1975 | while (*p) p++; |
1976 | } | |
6c1c3d1d WB |
1977 | } |
1978 | ||
a7538db1 JH |
1979 | if (addr->dsn_orcpt != NULL) |
1980 | { | |
6c1c3d1d WB |
1981 | string_format(p, sizeof(buffer) - (p-buffer), " ORCPT=%s", |
1982 | addr->dsn_orcpt); | |
1983 | while (*p) p++; | |
1984 | } | |
1985 | } | |
6c1c3d1d | 1986 | |
0756eb3c PH |
1987 | /* Now send the RCPT command, and process outstanding responses when |
1988 | necessary. After a timeout on RCPT, we just end the function, leaving the | |
1989 | yield as OK, because this error can often mean that there is a problem with | |
1990 | just one address, so we don't want to delay the host. */ | |
1991 | ||
6c1c3d1d WB |
1992 | count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s%s\r\n", |
1993 | transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr, buffer); | |
6c1c3d1d | 1994 | |
0756eb3c PH |
1995 | if (count < 0) goto SEND_FAILED; |
1996 | if (count > 0) | |
1997 | { | |
1998 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, | |
48c7f9e2 PH |
1999 | &sync_addr, host, count, ob->address_retry_include_sender, |
2000 | pending_MAIL, 0, &inblock, ob->command_timeout, buffer, | |
2001 | sizeof(buffer))) | |
0756eb3c PH |
2002 | { |
2003 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
2004 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
2005 | break; | |
2006 | ||
2007 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
2008 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
2009 | case 0: /* No 2xx or 5xx, but no probs */ | |
2010 | break; | |
2011 | ||
2012 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
2013 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */ | |
2014 | } | |
2015 | pending_MAIL = FALSE; /* Dealt with MAIL */ | |
2016 | } | |
2017 | } /* Loop for next address */ | |
2018 | ||
2019 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either | |
2020 | permanently or temporarily. We should have flushed and synced after the last | |
2021 | RCPT. */ | |
2022 | ||
2023 | if (mua_wrapper) | |
2024 | { | |
2025 | address_item *badaddr; | |
168dec3b JH |
2026 | for (badaddr = first_addr; badaddr; badaddr = badaddr->next) |
2027 | if (badaddr->transport_return != PENDING_OK) | |
2028 | { | |
2029 | /*XXX could we find a better errno than 0 here? */ | |
2030 | set_errno(addrlist, 0, badaddr->message, FAIL, | |
2031 | testflag(badaddr, af_pass_message), NULL); | |
2032 | ok = FALSE; | |
2033 | break; | |
2034 | } | |
0756eb3c PH |
2035 | } |
2036 | ||
2037 | /* If ok is TRUE, we know we have got at least one good recipient, and must now | |
2038 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still | |
2039 | have a good recipient buffered up if we are pipelining. We don't want to waste | |
2040 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we | |
2041 | are pipelining. The responses are all handled by sync_responses(). */ | |
2042 | ||
2043 | if (ok || (smtp_use_pipelining && !mua_wrapper)) | |
2044 | { | |
2045 | int count = smtp_write_command(&outblock, FALSE, "DATA\r\n"); | |
2046 | if (count < 0) goto SEND_FAILED; | |
2047 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr, | |
48c7f9e2 PH |
2048 | host, count, ob->address_retry_include_sender, pending_MAIL, |
2049 | ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer))) | |
0756eb3c PH |
2050 | { |
2051 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
2052 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
2053 | break; | |
2054 | ||
2055 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
2056 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
2057 | case 0: break; /* No 2xx or 5xx, but no probs */ | |
2058 | ||
2059 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
2060 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ | |
2061 | } | |
2062 | } | |
2063 | ||
2064 | /* Save the first address of the next batch. */ | |
2065 | ||
2066 | first_addr = addr; | |
2067 | ||
2068 | /* If there were no good recipients (but otherwise there have been no | |
2069 | problems), just set ok TRUE, since we have handled address-specific errors | |
2070 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism | |
2071 | for handling the SMTP dot-handling protocol, flagging to apply to headers as | |
2072 | well as body. Set the appropriate timeout value to be used for each chunk. | |
2073 | (Haven't been able to make it work using select() for writing yet.) */ | |
2074 | ||
2075 | if (!ok) ok = TRUE; else | |
2076 | { | |
2077 | sigalrm_seen = FALSE; | |
2078 | transport_write_timeout = ob->data_timeout; | |
2079 | smtp_command = US"sending data block"; /* For error messages */ | |
2080 | DEBUG(D_transport|D_v) | |
2081 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); | |
2082 | transport_count = 0; | |
a7538db1 | 2083 | |
80a47a2c | 2084 | #ifndef DISABLE_DKIM |
4cd12fe9 TK |
2085 | ok = dkim_transport_write_message(addrlist, inblock.sock, |
2086 | topt_use_crlf | topt_end_dot | topt_escape_headers | | |
2087 | (tblock->body_only? topt_no_headers : 0) | | |
2088 | (tblock->headers_only? topt_no_body : 0) | | |
2089 | (tblock->return_path_add? topt_add_return_path : 0) | | |
2090 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
2091 | (tblock->envelope_to_add? topt_add_envelope_to : 0), | |
2092 | 0, /* No size limit */ | |
2093 | tblock->add_headers, tblock->remove_headers, | |
2094 | US".", US"..", /* Escaping strings */ | |
2095 | tblock->rewrite_rules, tblock->rewrite_existflags, | |
2096 | ob->dkim_private_key, ob->dkim_domain, ob->dkim_selector, | |
80a47a2c | 2097 | ob->dkim_canon, ob->dkim_strict, ob->dkim_sign_headers |
4cd12fe9 TK |
2098 | ); |
2099 | #else | |
0756eb3c PH |
2100 | ok = transport_write_message(addrlist, inblock.sock, |
2101 | topt_use_crlf | topt_end_dot | topt_escape_headers | | |
2102 | (tblock->body_only? topt_no_headers : 0) | | |
2103 | (tblock->headers_only? topt_no_body : 0) | | |
2104 | (tblock->return_path_add? topt_add_return_path : 0) | | |
2105 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
2106 | (tblock->envelope_to_add? topt_add_envelope_to : 0), | |
2107 | 0, /* No size limit */ | |
2108 | tblock->add_headers, tblock->remove_headers, | |
2109 | US".", US"..", /* Escaping strings */ | |
2110 | tblock->rewrite_rules, tblock->rewrite_existflags); | |
4cd12fe9 | 2111 | #endif |
0756eb3c PH |
2112 | |
2113 | /* transport_write_message() uses write() because it is called from other | |
2114 | places to write to non-sockets. This means that under some OS (e.g. Solaris) | |
2115 | it can exit with "Broken pipe" as its error. This really means that the | |
2116 | socket got closed at the far end. */ | |
2117 | ||
2118 | transport_write_timeout = 0; /* for subsequent transports */ | |
2119 | ||
2120 | /* Failure can either be some kind of I/O disaster (including timeout), | |
2121 | or the failure of a transport filter or the expansion of added headers. */ | |
2122 | ||
2123 | if (!ok) | |
2124 | { | |
2125 | buffer[0] = 0; /* There hasn't been a response */ | |
2126 | goto RESPONSE_FAILED; | |
2127 | } | |
2128 | ||
2129 | /* We used to send the terminating "." explicitly here, but because of | |
2130 | buffering effects at both ends of TCP/IP connections, you don't gain | |
2131 | anything by keeping it separate, so it might as well go in the final | |
2132 | data buffer for efficiency. This is now done by setting the topt_end_dot | |
2133 | flag above. */ | |
2134 | ||
2135 | smtp_command = US"end of data"; | |
2136 | ||
8ccd00b1 | 2137 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2138 | /* For PRDR we optionally get a partial-responses warning |
2139 | * followed by the individual responses, before going on with | |
2140 | * the overall response. If we don't get the warning then deal | |
2141 | * with per non-PRDR. */ | |
2142 | if(prdr_active) | |
2143 | { | |
2144 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '3', | |
2145 | ob->final_timeout); | |
2146 | if (!ok && errno == 0) | |
2147 | switch(buffer[0]) | |
2148 | { | |
2149 | case '2': prdr_active = FALSE; | |
2150 | ok = TRUE; | |
2151 | break; | |
2152 | case '4': errno = ERRNO_DATA4XX; | |
2153 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
2154 | break; | |
2155 | } | |
2156 | } | |
2157 | else | |
2158 | #endif | |
2159 | ||
2160 | /* For non-PRDR SMTP, we now read a single response that applies to the | |
2161 | whole message. If it is OK, then all the addresses have been delivered. */ | |
0756eb3c | 2162 | |
e97957bc PH |
2163 | if (!lmtp) |
2164 | { | |
2165 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2166 | ob->final_timeout); | |
2167 | if (!ok && errno == 0 && buffer[0] == '4') | |
2168 | { | |
2169 | errno = ERRNO_DATA4XX; | |
2170 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
2171 | } | |
2172 | } | |
0756eb3c PH |
2173 | |
2174 | /* For LMTP, we get back a response for every RCPT command that we sent; | |
2175 | some may be accepted and some rejected. For those that get a response, their | |
2176 | status is fixed; any that are accepted have been handed over, even if later | |
2177 | responses crash - at least, that's how I read RFC 2033. | |
2178 | ||
2179 | If all went well, mark the recipient addresses as completed, record which | |
2180 | host/IPaddress they were delivered to, and cut out RSET when sending another | |
2181 | message down the same channel. Write the completed addresses to the journal | |
2182 | now so that they are recorded in case there is a crash of hardware or | |
2183 | software before the spool gets updated. Also record the final SMTP | |
2184 | confirmation if needed (for SMTP only). */ | |
2185 | ||
2186 | if (ok) | |
2187 | { | |
2188 | int flag = '='; | |
2189 | int delivery_time = (int)(time(NULL) - start_delivery_time); | |
2190 | int len; | |
0756eb3c PH |
2191 | uschar *conf = NULL; |
2192 | send_rset = FALSE; | |
2193 | ||
0756eb3c PH |
2194 | /* Set up confirmation if needed - applies only to SMTP */ |
2195 | ||
d68218c7 | 2196 | if ( |
774ef2d7 | 2197 | #ifndef EXPERIMENTAL_EVENT |
d68218c7 | 2198 | (log_extra_selector & LX_smtp_confirmation) != 0 && |
a7538db1 | 2199 | #endif |
d68218c7 JH |
2200 | !lmtp |
2201 | ) | |
0756eb3c | 2202 | { |
55414b25 JH |
2203 | const uschar *s = string_printing(buffer); |
2204 | /* deconst cast ok here as string_printing was checked to have alloc'n'copied */ | |
2205 | conf = (s == buffer)? (uschar *)string_copy(s) : US s; | |
0756eb3c PH |
2206 | } |
2207 | ||
fd98a5c6 | 2208 | /* Process all transported addresses - for LMTP or PRDR, read a status for |
0756eb3c PH |
2209 | each one. */ |
2210 | ||
2211 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
2212 | { | |
2213 | if (addr->transport_return != PENDING_OK) continue; | |
2214 | ||
2215 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the | |
2216 | remaining addresses. Otherwise, it's a return code for just the one | |
75def545 PH |
2217 | address. For temporary errors, add a retry item for the address so that |
2218 | it doesn't get tried again too soon. */ | |
0756eb3c | 2219 | |
8ccd00b1 | 2220 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2221 | if (lmtp || prdr_active) |
2222 | #else | |
0756eb3c | 2223 | if (lmtp) |
fd98a5c6 | 2224 | #endif |
0756eb3c PH |
2225 | { |
2226 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2227 | ob->final_timeout)) | |
2228 | { | |
2229 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; | |
fd98a5c6 | 2230 | addr->message = string_sprintf( |
8ccd00b1 | 2231 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2232 | "%s error after %s: %s", prdr_active ? "PRDR":"LMTP", |
2233 | #else | |
2234 | "LMTP error after %s: %s", | |
2235 | #endif | |
0756eb3c | 2236 | big_buffer, string_printing(buffer)); |
75def545 PH |
2237 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
2238 | if (buffer[0] == '5') | |
2239 | addr->transport_return = FAIL; | |
2240 | else | |
2241 | { | |
e97957bc PH |
2242 | errno = ERRNO_DATA4XX; |
2243 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
75def545 | 2244 | addr->transport_return = DEFER; |
8ccd00b1 | 2245 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2246 | if (!prdr_active) |
2247 | #endif | |
2248 | retry_add_item(addr, addr->address_retry_key, 0); | |
75def545 | 2249 | } |
0756eb3c PH |
2250 | continue; |
2251 | } | |
2252 | completed_address = TRUE; /* NOW we can set this flag */ | |
c0ea85ab TF |
2253 | if ((log_extra_selector & LX_smtp_confirmation) != 0) |
2254 | { | |
55414b25 JH |
2255 | const uschar *s = string_printing(buffer); |
2256 | /* deconst cast ok here as string_printing was checked to have alloc'n'copied */ | |
2257 | conf = (s == buffer)? (uschar *)string_copy(s) : US s; | |
c0ea85ab | 2258 | } |
0756eb3c PH |
2259 | } |
2260 | ||
2261 | /* SMTP, or success return from LMTP for this address. Pass back the | |
2d280592 | 2262 | actual host that was used. */ |
0756eb3c PH |
2263 | |
2264 | addr->transport_return = OK; | |
2265 | addr->more_errno = delivery_time; | |
d427a7f9 | 2266 | addr->host_used = host; |
0756eb3c PH |
2267 | addr->special_action = flag; |
2268 | addr->message = conf; | |
8ccd00b1 | 2269 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2270 | if (prdr_active) addr->flags |= af_prdr_used; |
2271 | #endif | |
0756eb3c PH |
2272 | flag = '-'; |
2273 | ||
8ccd00b1 | 2274 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2275 | if (!prdr_active) |
2276 | #endif | |
2277 | { | |
2278 | /* Update the journal. For homonymic addresses, use the base address plus | |
2279 | the transport name. See lots of comments in deliver.c about the reasons | |
2280 | for the complications when homonyms are involved. Just carry on after | |
2281 | write error, as it may prove possible to update the spool file later. */ | |
4d8d62b9 | 2282 | |
fd98a5c6 JH |
2283 | if (testflag(addr, af_homonym)) |
2284 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); | |
2285 | else | |
2286 | sprintf(CS buffer, "%.500s\n", addr->unique); | |
4d8d62b9 | 2287 | |
fd98a5c6 JH |
2288 | DEBUG(D_deliver) debug_printf("journalling %s", buffer); |
2289 | len = Ustrlen(CS buffer); | |
2290 | if (write(journal_fd, buffer, len) != len) | |
2291 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " | |
2292 | "%s: %s", buffer, strerror(errno)); | |
2293 | } | |
0756eb3c PH |
2294 | } |
2295 | ||
8ccd00b1 | 2296 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
2297 | if (prdr_active) |
2298 | { | |
2299 | /* PRDR - get the final, overall response. For any non-success | |
2300 | upgrade all the address statuses. */ | |
2301 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2302 | ob->final_timeout); | |
2303 | if (!ok) | |
2304 | { | |
2305 | if(errno == 0 && buffer[0] == '4') | |
2306 | { | |
2307 | errno = ERRNO_DATA4XX; | |
2308 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
2309 | } | |
2310 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
2311 | if (buffer[0] == '5' || addr->transport_return == OK) | |
2312 | addr->transport_return = PENDING_OK; /* allow set_errno action */ | |
2313 | goto RESPONSE_FAILED; | |
2314 | } | |
2315 | ||
2316 | /* Update the journal, or setup retry. */ | |
2317 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
2318 | if (addr->transport_return == OK) | |
2319 | { | |
2320 | if (testflag(addr, af_homonym)) | |
2321 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); | |
2322 | else | |
2323 | sprintf(CS buffer, "%.500s\n", addr->unique); | |
4d8d62b9 | 2324 | |
fd98a5c6 JH |
2325 | DEBUG(D_deliver) debug_printf("journalling(PRDR) %s", buffer); |
2326 | len = Ustrlen(CS buffer); | |
2327 | if (write(journal_fd, buffer, len) != len) | |
2328 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " | |
2329 | "%s: %s", buffer, strerror(errno)); | |
2330 | } | |
2331 | else if (addr->transport_return == DEFER) | |
2332 | retry_add_item(addr, addr->address_retry_key, -2); | |
2333 | } | |
2334 | #endif | |
2335 | ||
0756eb3c PH |
2336 | /* Ensure the journal file is pushed out to disk. */ |
2337 | ||
54fc8428 | 2338 | if (EXIMfsync(journal_fd) < 0) |
0756eb3c PH |
2339 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", |
2340 | strerror(errno)); | |
2341 | } | |
2342 | } | |
2343 | ||
2344 | ||
2345 | /* Handle general (not specific to one address) failures here. The value of ok | |
2346 | is used to skip over this code on the falling through case. A timeout causes a | |
2347 | deferral. Other errors may defer or fail according to the response code, and | |
2348 | may set up a special errno value, e.g. after connection chopped, which is | |
2349 | assumed if errno == 0 and there is no text in the buffer. If control reaches | |
2350 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as | |
2351 | the problem is not related to this specific message. */ | |
2352 | ||
2353 | if (!ok) | |
2354 | { | |
2355 | int code; | |
2356 | ||
2357 | RESPONSE_FAILED: | |
2358 | save_errno = errno; | |
2359 | message = NULL; | |
2360 | send_quit = check_response(host, &save_errno, addrlist->more_errno, | |
447d236c | 2361 | buffer, &code, &message, &pass_message); |
0756eb3c PH |
2362 | goto FAILED; |
2363 | ||
2364 | SEND_FAILED: | |
2365 | save_errno = errno; | |
2366 | code = '4'; | |
2367 | message = US string_sprintf("send() to %s [%s] failed: %s", | |
2368 | host->name, host->address, strerror(save_errno)); | |
2369 | send_quit = FALSE; | |
2370 | goto FAILED; | |
2371 | ||
2372 | /* This label is jumped to directly when a TLS negotiation has failed, | |
2373 | or was not done for a host for which it is required. Values will be set | |
2374 | in message and save_errno, and setting_up will always be true. Treat as | |
2375 | a temporary error. */ | |
2376 | ||
a7538db1 | 2377 | #ifdef SUPPORT_TLS |
0756eb3c PH |
2378 | TLS_FAILED: |
2379 | code = '4'; | |
a7538db1 | 2380 | #endif |
0756eb3c PH |
2381 | |
2382 | /* If the failure happened while setting up the call, see if the failure was | |
2383 | a 5xx response (this will either be on connection, or following HELO - a 5xx | |
2384 | after EHLO causes it to try HELO). If so, fail all addresses, as this host is | |
2385 | never going to accept them. For other errors during setting up (timeouts or | |
2386 | whatever), defer all addresses, and yield DEFER, so that the host is not | |
2387 | tried again for a while. */ | |
2388 | ||
2389 | FAILED: | |
2390 | ok = FALSE; /* For when reached by GOTO */ | |
2391 | ||
2392 | if (setting_up) | |
2393 | { | |
2394 | if (code == '5') | |
c562fd30 | 2395 | set_errno(addrlist, save_errno, message, FAIL, pass_message, host); |
0756eb3c PH |
2396 | else |
2397 | { | |
c562fd30 | 2398 | set_errno(addrlist, save_errno, message, DEFER, pass_message, host); |
0756eb3c PH |
2399 | yield = DEFER; |
2400 | } | |
2401 | } | |
2402 | ||
e97957bc | 2403 | /* We want to handle timeouts after MAIL or "." and loss of connection after |
0756eb3c | 2404 | "." specially. They can indicate a problem with the sender address or with |
e97957bc PH |
2405 | the contents of the message rather than a real error on the connection. These |
2406 | cases are treated in the same way as a 4xx response. This next bit of code | |
2407 | does the classification. */ | |
0756eb3c | 2408 | |
e97957bc | 2409 | else |
0756eb3c | 2410 | { |
e97957bc | 2411 | BOOL message_error; |
0756eb3c | 2412 | |
e97957bc PH |
2413 | switch(save_errno) |
2414 | { | |
2415 | case 0: | |
2416 | case ERRNO_MAIL4XX: | |
2417 | case ERRNO_DATA4XX: | |
2418 | message_error = TRUE; | |
2419 | break; | |
0756eb3c | 2420 | |
e97957bc PH |
2421 | case ETIMEDOUT: |
2422 | message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 || | |
2423 | Ustrncmp(smtp_command,"end ",4) == 0; | |
2424 | break; | |
2425 | ||
2426 | case ERRNO_SMTPCLOSED: | |
2427 | message_error = Ustrncmp(smtp_command,"end ",4) == 0; | |
2428 | break; | |
2429 | ||
2430 | default: | |
2431 | message_error = FALSE; | |
2432 | break; | |
2433 | } | |
0756eb3c | 2434 | |
e97957bc | 2435 | /* Handle the cases that are treated as message errors. These are: |
0756eb3c | 2436 | |
e97957bc PH |
2437 | (a) negative response or timeout after MAIL |
2438 | (b) negative response after DATA | |
2439 | (c) negative response or timeout or dropped connection after "." | |
0756eb3c | 2440 | |
e97957bc PH |
2441 | It won't be a negative response or timeout after RCPT, as that is dealt |
2442 | with separately above. The action in all cases is to set an appropriate | |
2443 | error code for all the addresses, but to leave yield set to OK because the | |
2444 | host itself has not failed. Of course, it might in practice have failed | |
2445 | when we've had a timeout, but if so, we'll discover that at the next | |
2446 | delivery attempt. For a temporary error, set the message_defer flag, and | |
2447 | write to the logs for information if this is not the last host. The error | |
2448 | for the last host will be logged as part of the address's log line. */ | |
2449 | ||
2450 | if (message_error) | |
0756eb3c | 2451 | { |
e97957bc PH |
2452 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ |
2453 | set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER, | |
c562fd30 | 2454 | pass_message, host); |
e97957bc PH |
2455 | |
2456 | /* If there's an errno, the message contains just the identity of | |
2457 | the host. */ | |
2458 | ||
2459 | if (code != '5') /* Anything other than 5 is treated as temporary */ | |
2460 | { | |
2461 | if (save_errno > 0) | |
2462 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); | |
2463 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message); | |
c562fd30 | 2464 | msglog_line(host, message); |
e97957bc PH |
2465 | *message_defer = TRUE; |
2466 | } | |
2467 | } | |
2468 | ||
2469 | /* Otherwise, we have an I/O error or a timeout other than after MAIL or | |
2470 | ".", or some other transportation error. We defer all addresses and yield | |
2471 | DEFER, except for the case of failed add_headers expansion, or a transport | |
2472 | filter failure, when the yield should be ERROR, to stop it trying other | |
2473 | hosts. */ | |
2474 | ||
2475 | else | |
2476 | { | |
2477 | yield = (save_errno == ERRNO_CHHEADER_FAIL || | |
2478 | save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER; | |
c562fd30 | 2479 | set_errno(addrlist, save_errno, message, DEFER, pass_message, host); |
0756eb3c PH |
2480 | } |
2481 | } | |
2482 | } | |
2483 | ||
2484 | ||
2485 | /* If all has gone well, send_quit will be set TRUE, implying we can end the | |
2486 | SMTP session tidily. However, if there were too many addresses to send in one | |
2487 | message (indicated by first_addr being non-NULL) we want to carry on with the | |
2488 | rest of them. Also, it is desirable to send more than one message down the SMTP | |
2489 | connection if there are several waiting, provided we haven't already sent so | |
2490 | many as to hit the configured limit. The function transport_check_waiting looks | |
2491 | for a waiting message and returns its id. Then transport_pass_socket tries to | |
2492 | set up a continued delivery by passing the socket on to another process. The | |
2493 | variable send_rset is FALSE if a message has just been successfully transfered. | |
2494 | ||
2495 | If we are already sending down a continued channel, there may be further | |
2496 | addresses not yet delivered that are aimed at the same host, but which have not | |
2497 | been passed in this run of the transport. In this case, continue_more will be | |
2498 | true, and all we should do is send RSET if necessary, and return, leaving the | |
2499 | channel open. | |
2500 | ||
2501 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we | |
2502 | do not want to continue with other messages down the same channel, because that | |
2503 | can lead to looping between two or more messages, all with the same, | |
2504 | temporarily failing address(es). [The retry information isn't updated yet, so | |
2505 | new processes keep on trying.] We probably also don't want to try more of this | |
2506 | message's addresses either. | |
2507 | ||
2508 | If we have started a TLS session, we have to end it before passing the | |
2509 | connection to a new process. However, not all servers can handle this (Exim | |
2510 | can), so we do not pass such a connection on if the host matches | |
2511 | hosts_nopass_tls. */ | |
2512 | ||
2513 | DEBUG(D_transport) | |
2514 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " | |
2515 | "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset, | |
2516 | continue_more, yield, (first_addr == NULL)? "":"not "); | |
2517 | ||
2518 | if (completed_address && ok && send_quit) | |
2519 | { | |
2520 | BOOL more; | |
5130845b JH |
2521 | if ( first_addr != NULL |
2522 | || continue_more | |
2523 | || ( ( tls_out.active < 0 | |
2524 | || verify_check_given_host(&ob->hosts_nopass_tls, host) != OK | |
2525 | ) | |
0756eb3c PH |
2526 | && |
2527 | transport_check_waiting(tblock->name, host->name, | |
2528 | tblock->connection_max_messages, new_message_id, &more) | |
5130845b | 2529 | ) ) |
0756eb3c PH |
2530 | { |
2531 | uschar *msg; | |
447d236c | 2532 | BOOL pass_message; |
0756eb3c PH |
2533 | |
2534 | if (send_rset) | |
2535 | { | |
2536 | if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0)) | |
2537 | { | |
2538 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, | |
2539 | host->address, strerror(save_errno)); | |
2540 | send_quit = FALSE; | |
2541 | } | |
2542 | else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2543 | ob->command_timeout))) | |
2544 | { | |
2545 | int code; | |
447d236c PH |
2546 | send_quit = check_response(host, &errno, 0, buffer, &code, &msg, |
2547 | &pass_message); | |
0756eb3c PH |
2548 | if (!send_quit) |
2549 | { | |
c562fd30 JH |
2550 | DEBUG(D_transport) debug_printf("H=%s [%s] %s\n", |
2551 | host->name, host->address, msg); | |
0756eb3c PH |
2552 | } |
2553 | } | |
2554 | } | |
2555 | ||
2556 | /* Either RSET was not needed, or it succeeded */ | |
2557 | ||
2558 | if (ok) | |
2559 | { | |
2560 | if (first_addr != NULL) /* More addresses still to be sent */ | |
2561 | { /* in this run of the transport */ | |
2562 | continue_sequence++; /* Causes * in logging */ | |
2563 | goto SEND_MESSAGE; | |
2564 | } | |
2565 | if (continue_more) return yield; /* More addresses for another run */ | |
2566 | ||
2567 | /* Pass the socket to a new Exim process. Before doing so, we must shut | |
2568 | down TLS. Not all MTAs allow for the continuation of the SMTP session | |
2569 | when TLS is shut down. We test for this by sending a new EHLO. If we | |
2570 | don't get a good response, we don't attempt to pass the socket on. */ | |
2571 | ||
a7538db1 | 2572 | #ifdef SUPPORT_TLS |
817d9f57 | 2573 | if (tls_out.active >= 0) |
0756eb3c | 2574 | { |
817d9f57 | 2575 | tls_close(FALSE, TRUE); |
061b7ebd PP |
2576 | if (smtps) |
2577 | ok = FALSE; | |
2578 | else | |
2579 | ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 && | |
2580 | smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2581 | ob->command_timeout); | |
0756eb3c | 2582 | } |
a7538db1 | 2583 | #endif |
0756eb3c PH |
2584 | |
2585 | /* If the socket is successfully passed, we musn't send QUIT (or | |
2586 | indeed anything!) from here. */ | |
2587 | ||
2588 | if (ok && transport_pass_socket(tblock->name, host->name, host->address, | |
2589 | new_message_id, inblock.sock)) | |
2590 | { | |
2591 | send_quit = FALSE; | |
2592 | } | |
2593 | } | |
2594 | ||
2595 | /* If RSET failed and there are addresses left, they get deferred. */ | |
2596 | ||
c562fd30 | 2597 | else set_errno(first_addr, errno, msg, DEFER, FALSE, host); |
0756eb3c PH |
2598 | } |
2599 | } | |
2600 | ||
2601 | /* End off tidily with QUIT unless the connection has died or the socket has | |
2602 | been passed to another process. There has been discussion on the net about what | |
2603 | to do after sending QUIT. The wording of the RFC suggests that it is necessary | |
2604 | to wait for a response, but on the other hand, there isn't anything one can do | |
2605 | with an error response, other than log it. Exim used to do that. However, | |
2606 | further discussion suggested that it is positively advantageous not to wait for | |
2607 | the response, but to close the session immediately. This is supposed to move | |
2608 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some | |
2609 | load from the server. (Hosts that are both servers and clients may not see much | |
2610 | difference, of course.) Further discussion indicated that this was safe to do | |
2611 | on Unix systems which have decent implementations of TCP/IP that leave the | |
2612 | connection around for a while (TIME_WAIT) after the application has gone away. | |
2613 | This enables the response sent by the server to be properly ACKed rather than | |
2614 | timed out, as can happen on broken TCP/IP implementations on other OS. | |
2615 | ||
2616 | This change is being made on 31-Jul-98. After over a year of trouble-free | |
2617 | operation, the old commented-out code was removed on 17-Sep-99. */ | |
2618 | ||
2619 | SEND_QUIT: | |
2620 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
2621 | ||
2622 | END_OFF: | |
2623 | ||
2624 | #ifdef SUPPORT_TLS | |
817d9f57 | 2625 | tls_close(FALSE, TRUE); |
0756eb3c PH |
2626 | #endif |
2627 | ||
2628 | /* Close the socket, and return the appropriate value, first setting | |
0756eb3c PH |
2629 | works because the NULL setting is passed back to the calling process, and |
2630 | remote_max_parallel is forced to 1 when delivering over an existing connection, | |
2631 | ||
2632 | If all went well and continue_more is set, we shouldn't actually get here if | |
2633 | there are further addresses, as the return above will be taken. However, | |
2634 | writing RSET might have failed, or there may be other addresses whose hosts are | |
2635 | specified in the transports, and therefore not visible at top level, in which | |
2636 | case continue_more won't get set. */ | |
2637 | ||
f1e894f3 | 2638 | (void)close(inblock.sock); |
a7538db1 | 2639 | |
774ef2d7 JH |
2640 | #ifdef EXPERIMENTAL_EVENT |
2641 | (void) event_raise(tblock->event_action, US"tcp:close", NULL); | |
a7538db1 JH |
2642 | #endif |
2643 | ||
0756eb3c PH |
2644 | continue_transport = NULL; |
2645 | continue_hostname = NULL; | |
2646 | return yield; | |
2647 | } | |
2648 | ||
2649 | ||
2650 | ||
2651 | ||
2652 | /************************************************* | |
2653 | * Closedown entry point * | |
2654 | *************************************************/ | |
2655 | ||
2656 | /* This function is called when exim is passed an open smtp channel | |
2657 | from another incarnation, but the message which it has been asked | |
2658 | to deliver no longer exists. The channel is on stdin. | |
2659 | ||
2660 | We might do fancy things like looking for another message to send down | |
2661 | the channel, but if the one we sought has gone, it has probably been | |
2662 | delivered by some other process that itself will seek further messages, | |
2663 | so just close down our connection. | |
2664 | ||
2665 | Argument: pointer to the transport instance block | |
2666 | Returns: nothing | |
2667 | */ | |
2668 | ||
2669 | void | |
2670 | smtp_transport_closedown(transport_instance *tblock) | |
2671 | { | |
2672 | smtp_transport_options_block *ob = | |
2673 | (smtp_transport_options_block *)(tblock->options_block); | |
2674 | smtp_inblock inblock; | |
2675 | smtp_outblock outblock; | |
2676 | uschar buffer[256]; | |
2677 | uschar inbuffer[4096]; | |
2678 | uschar outbuffer[16]; | |
2679 | ||
2680 | inblock.sock = fileno(stdin); | |
2681 | inblock.buffer = inbuffer; | |
2682 | inblock.buffersize = sizeof(inbuffer); | |
2683 | inblock.ptr = inbuffer; | |
2684 | inblock.ptrend = inbuffer; | |
2685 | ||
2686 | outblock.sock = inblock.sock; | |
2687 | outblock.buffersize = sizeof(outbuffer); | |
2688 | outblock.buffer = outbuffer; | |
2689 | outblock.ptr = outbuffer; | |
2690 | outblock.cmd_count = 0; | |
2691 | outblock.authenticating = FALSE; | |
2692 | ||
2693 | (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
2694 | (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2695 | ob->command_timeout); | |
f1e894f3 | 2696 | (void)close(inblock.sock); |
0756eb3c PH |
2697 | } |
2698 | ||
2699 | ||
2700 | ||
2701 | /************************************************* | |
2702 | * Prepare addresses for delivery * | |
2703 | *************************************************/ | |
2704 | ||
2705 | /* This function is called to flush out error settings from previous delivery | |
2706 | attempts to other hosts. It also records whether we got here via an MX record | |
2707 | or not in the more_errno field of the address. We are interested only in | |
2708 | addresses that are still marked DEFER - others may have got delivered to a | |
2709 | previously considered IP address. Set their status to PENDING_DEFER to indicate | |
2710 | which ones are relevant this time. | |
2711 | ||
2712 | Arguments: | |
2713 | addrlist the list of addresses | |
2714 | host the host we are delivering to | |
2715 | ||
2716 | Returns: the first address for this delivery | |
2717 | */ | |
2718 | ||
2719 | static address_item * | |
2720 | prepare_addresses(address_item *addrlist, host_item *host) | |
2721 | { | |
2722 | address_item *first_addr = NULL; | |
2723 | address_item *addr; | |
2724 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
168dec3b JH |
2725 | if (addr->transport_return == DEFER) |
2726 | { | |
2727 | if (first_addr == NULL) first_addr = addr; | |
2728 | addr->transport_return = PENDING_DEFER; | |
2729 | addr->basic_errno = 0; | |
2730 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; | |
2731 | addr->message = NULL; | |
a7538db1 | 2732 | #ifdef SUPPORT_TLS |
168dec3b JH |
2733 | addr->cipher = NULL; |
2734 | addr->ourcert = NULL; | |
2735 | addr->peercert = NULL; | |
2736 | addr->peerdn = NULL; | |
2737 | addr->ocsp = OCSP_NOT_REQ; | |
a7538db1 | 2738 | #endif |
168dec3b | 2739 | } |
0756eb3c PH |
2740 | return first_addr; |
2741 | } | |
2742 | ||
2743 | ||
2744 | ||
2745 | /************************************************* | |
2746 | * Main entry point * | |
2747 | *************************************************/ | |
2748 | ||
2749 | /* See local README for interface details. As this is a remote transport, it is | |
2750 | given a chain of addresses to be delivered in one connection, if possible. It | |
2751 | always returns TRUE, indicating that each address has its own independent | |
2752 | status set, except if there is a setting up problem, in which case it returns | |
2753 | FALSE. */ | |
2754 | ||
2755 | BOOL | |
2756 | smtp_transport_entry( | |
2757 | transport_instance *tblock, /* data for this instantiation */ | |
2758 | address_item *addrlist) /* addresses we are working on */ | |
2759 | { | |
2760 | int cutoff_retry; | |
2761 | int port; | |
2762 | int hosts_defer = 0; | |
2763 | int hosts_fail = 0; | |
2764 | int hosts_looked_up = 0; | |
2765 | int hosts_retry = 0; | |
2766 | int hosts_serial = 0; | |
2767 | int hosts_total = 0; | |
8e669ac1 | 2768 | int total_hosts_tried = 0; |
0756eb3c PH |
2769 | address_item *addr; |
2770 | BOOL expired = TRUE; | |
2771 | BOOL continuing = continue_hostname != NULL; | |
2772 | uschar *expanded_hosts = NULL; | |
2773 | uschar *pistring; | |
2774 | uschar *tid = string_sprintf("%s transport", tblock->name); | |
2775 | smtp_transport_options_block *ob = | |
2776 | (smtp_transport_options_block *)(tblock->options_block); | |
2777 | host_item *hostlist = addrlist->host_list; | |
2778 | host_item *host = NULL; | |
2779 | ||
2780 | DEBUG(D_transport) | |
2781 | { | |
2782 | debug_printf("%s transport entered\n", tblock->name); | |
2783 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2784 | debug_printf(" %s\n", addr->address); | |
2785 | if (continuing) debug_printf("already connected to %s [%s]\n", | |
2786 | continue_hostname, continue_host_address); | |
2787 | } | |
2788 | ||
f6c332bd PH |
2789 | /* Set the flag requesting that these hosts be added to the waiting |
2790 | database if the delivery fails temporarily or if we are running with | |
2791 | queue_smtp or a 2-stage queue run. This gets unset for certain | |
2792 | kinds of error, typically those that are specific to the message. */ | |
2793 | ||
2794 | update_waiting = TRUE; | |
2795 | ||
0756eb3c PH |
2796 | /* If a host list is not defined for the addresses - they must all have the |
2797 | same one in order to be passed to a single transport - or if the transport has | |
2798 | a host list with hosts_override set, use the host list supplied with the | |
2799 | transport. It is an error for this not to exist. */ | |
2800 | ||
2801 | if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL)) | |
2802 | { | |
2803 | if (ob->hosts == NULL) | |
2804 | { | |
2805 | addrlist->message = string_sprintf("%s transport called with no hosts set", | |
2806 | tblock->name); | |
2807 | addrlist->transport_return = PANIC; | |
2808 | return FALSE; /* Only top address has status */ | |
2809 | } | |
2810 | ||
2811 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", | |
2812 | ob->hosts); | |
2813 | ||
2814 | /* If the transport's host list contains no '$' characters, and we are not | |
2815 | randomizing, it is fixed and therefore a chain of hosts can be built once | |
2816 | and for all, and remembered for subsequent use by other calls to this | |
2817 | transport. If, on the other hand, the host list does contain '$', or we are | |
2818 | randomizing its order, we have to rebuild it each time. In the fixed case, | |
2819 | as the hosts string will never be used again, it doesn't matter that we | |
2820 | replace all the : characters with zeros. */ | |
2821 | ||
2822 | if (ob->hostlist == NULL) | |
2823 | { | |
2824 | uschar *s = ob->hosts; | |
2825 | ||
2826 | if (Ustrchr(s, '$') != NULL) | |
2827 | { | |
d427a7f9 | 2828 | if (!(expanded_hosts = expand_string(s))) |
0756eb3c PH |
2829 | { |
2830 | addrlist->message = string_sprintf("failed to expand list of hosts " | |
2831 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); | |
2832 | addrlist->transport_return = search_find_defer? DEFER : PANIC; | |
2833 | return FALSE; /* Only top address has status */ | |
2834 | } | |
2835 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " | |
2836 | "\"%s\"\n", s, expanded_hosts); | |
2837 | s = expanded_hosts; | |
2838 | } | |
2839 | else | |
2840 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); | |
2841 | ||
2842 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); | |
2843 | ||
e276e04b TF |
2844 | /* Check that the expansion yielded something useful. */ |
2845 | if (hostlist == NULL) | |
2846 | { | |
2847 | addrlist->message = | |
2848 | string_sprintf("%s transport has empty hosts setting", tblock->name); | |
2849 | addrlist->transport_return = PANIC; | |
2850 | return FALSE; /* Only top address has status */ | |
2851 | } | |
2852 | ||
0756eb3c PH |
2853 | /* If there was no expansion of hosts, save the host list for |
2854 | next time. */ | |
2855 | ||
d427a7f9 | 2856 | if (!expanded_hosts) ob->hostlist = hostlist; |
0756eb3c PH |
2857 | } |
2858 | ||
2859 | /* This is not the first time this transport has been run in this delivery; | |
2860 | the host list was built previously. */ | |
2861 | ||
55414b25 JH |
2862 | else |
2863 | hostlist = ob->hostlist; | |
0756eb3c PH |
2864 | } |
2865 | ||
2866 | /* The host list was supplied with the address. If hosts_randomize is set, we | |
2867 | must sort it into a random order if it did not come from MX records and has not | |
2868 | already been randomized (but don't bother if continuing down an existing | |
2869 | connection). */ | |
2870 | ||
2871 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing) | |
2872 | { | |
2873 | host_item *newlist = NULL; | |
2874 | while (hostlist != NULL) | |
2875 | { | |
2876 | host_item *h = hostlist; | |
2877 | hostlist = hostlist->next; | |
2878 | ||
2879 | h->sort_key = random_number(100); | |
2880 | ||
2881 | if (newlist == NULL) | |
2882 | { | |
2883 | h->next = NULL; | |
2884 | newlist = h; | |
2885 | } | |
2886 | else if (h->sort_key < newlist->sort_key) | |
2887 | { | |
2888 | h->next = newlist; | |
2889 | newlist = h; | |
2890 | } | |
2891 | else | |
2892 | { | |
2893 | host_item *hh = newlist; | |
2894 | while (hh->next != NULL) | |
2895 | { | |
2896 | if (h->sort_key < hh->next->sort_key) break; | |
2897 | hh = hh->next; | |
2898 | } | |
2899 | h->next = hh->next; | |
2900 | hh->next = h; | |
2901 | } | |
2902 | } | |
2903 | ||
2904 | hostlist = addrlist->host_list = newlist; | |
2905 | } | |
2906 | ||
2d280592 | 2907 | /* Sort out the default port. */ |
0756eb3c PH |
2908 | |
2909 | if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE; | |
0756eb3c | 2910 | |
0756eb3c PH |
2911 | /* For each host-plus-IP-address on the list: |
2912 | ||
2913 | . If this is a continued delivery and the host isn't the one with the | |
2914 | current connection, skip. | |
2915 | ||
2916 | . If the status is unusable (i.e. previously failed or retry checked), skip. | |
2917 | ||
2918 | . If no IP address set, get the address, either by turning the name into | |
2919 | an address, calling gethostbyname if gethostbyname is on, or by calling | |
2920 | the DNS. The DNS may yield multiple addresses, in which case insert the | |
2921 | extra ones into the list. | |
2922 | ||
2923 | . Get the retry data if not previously obtained for this address and set the | |
2924 | field which remembers the state of this address. Skip if the retry time is | |
2925 | not reached. If not, remember whether retry data was found. The retry string | |
2926 | contains both the name and the IP address. | |
2927 | ||
2928 | . Scan the list of addresses and mark those whose status is DEFER as | |
2929 | PENDING_DEFER. These are the only ones that will be processed in this cycle | |
2930 | of the hosts loop. | |
2931 | ||
2932 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. | |
2933 | Some addresses may be successfully delivered, others may fail, and yet | |
2934 | others may get temporary errors and so get marked DEFER. | |
2935 | ||
2936 | . The return from the delivery attempt is OK if a connection was made and a | |
2937 | valid SMTP dialogue was completed. Otherwise it is DEFER. | |
2938 | ||
2939 | . If OK, add a "remove" retry item for this host/IPaddress, if any. | |
2940 | ||
2941 | . If fail to connect, or other defer state, add a retry item. | |
2942 | ||
2943 | . If there are any addresses whose status is still DEFER, carry on to the | |
2944 | next host/IPaddress, unless we have tried the number of hosts given | |
533244af | 2945 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that |
8e669ac1 PH |
2946 | there is some fancy logic for hosts_max_try that means its limit can be |
2947 | overstepped in some circumstances. | |
0756eb3c PH |
2948 | |
2949 | If we get to the end of the list, all hosts have deferred at least one address, | |
2950 | or not reached their retry times. If delay_after_cutoff is unset, it requests a | |
2951 | delivery attempt to those hosts whose last try was before the arrival time of | |
2952 | the current message. To cope with this, we have to go round the loop a second | |
2953 | time. After that, set the status and error data for any addresses that haven't | |
2954 | had it set already. */ | |
2955 | ||
2956 | for (cutoff_retry = 0; expired && | |
2957 | cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2); | |
2958 | cutoff_retry++) | |
2959 | { | |
2960 | host_item *nexthost = NULL; | |
2961 | int unexpired_hosts_tried = 0; | |
2962 | ||
2963 | for (host = hostlist; | |
8e669ac1 | 2964 | host != NULL && |
533244af PH |
2965 | unexpired_hosts_tried < ob->hosts_max_try && |
2966 | total_hosts_tried < ob->hosts_max_try_hardlimit; | |
0756eb3c PH |
2967 | host = nexthost) |
2968 | { | |
2969 | int rc; | |
2970 | int host_af; | |
2971 | uschar *rs; | |
2972 | BOOL serialized = FALSE; | |
2973 | BOOL host_is_expired = FALSE; | |
2974 | BOOL message_defer = FALSE; | |
2975 | BOOL ifchanges = FALSE; | |
2976 | BOOL some_deferred = FALSE; | |
2977 | address_item *first_addr = NULL; | |
2978 | uschar *interface = NULL; | |
2979 | uschar *retry_host_key = NULL; | |
2980 | uschar *retry_message_key = NULL; | |
2981 | uschar *serialize_key = NULL; | |
2982 | ||
9c4e8f60 PH |
2983 | /* Default next host is next host. :-) But this can vary if the |
2984 | hosts_max_try limit is hit (see below). It may also be reset if a host | |
2985 | address is looked up here (in case the host was multihomed). */ | |
2986 | ||
2987 | nexthost = host->next; | |
2988 | ||
0756eb3c PH |
2989 | /* If the address hasn't yet been obtained from the host name, look it up |
2990 | now, unless the host is already marked as unusable. If it is marked as | |
2991 | unusable, it means that the router was unable to find its IP address (in | |
2992 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and | |
2993 | the lookup failed last time. We don't get this far if *all* MX records | |
2994 | point to non-existent hosts; that is treated as a hard error. | |
2995 | ||
2996 | We can just skip this host entirely. When the hosts came from the router, | |
2997 | the address will timeout based on the other host(s); when the address is | |
2998 | looked up below, there is an explicit retry record added. | |
2999 | ||
3000 | Note that we mustn't skip unusable hosts if the address is not unset; they | |
3001 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ | |
3002 | ||
3003 | if (host->address == NULL) | |
3004 | { | |
322050c2 | 3005 | int new_port, flags; |
7cd1141b | 3006 | host_item *hh; |
0756eb3c PH |
3007 | |
3008 | if (host->status >= hstatus_unusable) | |
3009 | { | |
3010 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", | |
3011 | host->name); | |
3012 | continue; | |
3013 | } | |
3014 | ||
3015 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); | |
3016 | ||
7cd1141b PH |
3017 | /* The host name is permitted to have an attached port. Find it, and |
3018 | strip it from the name. Just remember it for now. */ | |
3019 | ||
3020 | new_port = host_item_get_port(host); | |
3021 | ||
3022 | /* Count hosts looked up */ | |
3023 | ||
0756eb3c PH |
3024 | hosts_looked_up++; |
3025 | ||
3026 | /* Find by name if so configured, or if it's an IP address. We don't | |
3027 | just copy the IP address, because we need the test-for-local to happen. */ | |
3028 | ||
322050c2 PH |
3029 | flags = HOST_FIND_BY_A; |
3030 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
3031 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
3032 | ||
7e66e54d | 3033 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0) |
55414b25 | 3034 | rc = host_find_byname(host, NULL, flags, NULL, TRUE); |
0756eb3c | 3035 | else |
0756eb3c | 3036 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
578897ea | 3037 | ob->dnssec_request_domains, ob->dnssec_require_domains, |
55414b25 | 3038 | NULL, NULL); |
0756eb3c | 3039 | |
7cd1141b PH |
3040 | /* Update the host (and any additional blocks, resulting from |
3041 | multihoming) with a host-specific port, if any. */ | |
3042 | ||
3043 | for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port; | |
3044 | ||
0756eb3c PH |
3045 | /* Failure to find the host at this time (usually DNS temporary failure) |
3046 | is really a kind of routing failure rather than a transport failure. | |
3047 | Therefore we add a retry item of the routing kind, not to stop us trying | |
3048 | to look this name up here again, but to ensure the address gets timed | |
3049 | out if the failures go on long enough. A complete failure at this point | |
3050 | commonly points to a configuration error, but the best action is still | |
3051 | to carry on for the next host. */ | |
3052 | ||
3053 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED) | |
3054 | { | |
3055 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); | |
3056 | expired = FALSE; | |
3057 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; | |
3058 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? | |
3059 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); | |
3060 | host->status = hstatus_unusable; | |
3061 | ||
3062 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3063 | { | |
3064 | if (addr->transport_return != DEFER) continue; | |
3065 | addr->basic_errno = ERRNO_UNKNOWNHOST; | |
3066 | addr->message = | |
3067 | string_sprintf("failed to lookup IP address for %s", host->name); | |
3068 | } | |
3069 | continue; | |
3070 | } | |
3071 | ||
3072 | /* If the host is actually the local host, we may have a problem, or | |
3073 | there may be some cunning configuration going on. In the problem case, | |
3074 | log things and give up. The default transport status is already DEFER. */ | |
3075 | ||
3076 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) | |
3077 | { | |
3078 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3079 | { | |
3080 | addr->basic_errno = 0; | |
3081 | addr->message = string_sprintf("%s transport found host %s to be " | |
3082 | "local", tblock->name, host->name); | |
3083 | } | |
3084 | goto END_TRANSPORT; | |
3085 | } | |
3086 | } /* End of block for IP address lookup */ | |
3087 | ||
3088 | /* If this is a continued delivery, we are interested only in the host | |
3089 | which matches the name of the existing open channel. The check is put | |
3090 | here after the local host lookup, in case the name gets expanded as a | |
3091 | result of the lookup. Set expired FALSE, to save the outer loop executing | |
3092 | twice. */ | |
3093 | ||
3094 | if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 || | |
3095 | Ustrcmp(continue_host_address, host->address) != 0)) | |
3096 | { | |
3097 | expired = FALSE; | |
3098 | continue; /* With next host */ | |
3099 | } | |
3100 | ||
9c4e8f60 PH |
3101 | /* Reset the default next host in case a multihomed host whose addresses |
3102 | are not looked up till just above added to the host list. */ | |
83364d30 PH |
3103 | |
3104 | nexthost = host->next; | |
3105 | ||
0756eb3c PH |
3106 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the |
3107 | domain is in queue_smtp_domains, we don't actually want to attempt any | |
3108 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If | |
3109 | there is a lookup defer in queue_smtp_domains, proceed as if the domain | |
3110 | were not in it. We don't want to hold up all SMTP deliveries! Except when | |
3111 | doing a two-stage queue run, don't do this if forcing. */ | |
3112 | ||
3113 | if ((!deliver_force || queue_2stage) && (queue_smtp || | |
55414b25 JH |
3114 | match_isinlist(addrlist->domain, |
3115 | (const uschar **)&queue_smtp_domains, 0, | |
cf39cf57 | 3116 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)) |
0756eb3c PH |
3117 | { |
3118 | expired = FALSE; | |
3119 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3120 | { | |
3121 | if (addr->transport_return != DEFER) continue; | |
3122 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; | |
3123 | } | |
3124 | continue; /* With next host */ | |
3125 | } | |
3126 | ||
3127 | /* Count hosts being considered - purely for an intelligent comment | |
3128 | if none are usable. */ | |
3129 | ||
3130 | hosts_total++; | |
3131 | ||
3132 | /* Set $host and $host address now in case they are needed for the | |
3133 | interface expansion or the serialize_hosts check; they remain set if an | |
3134 | actual delivery happens. */ | |
3135 | ||
3136 | deliver_host = host->name; | |
3137 | deliver_host_address = host->address; | |
783b385f JH |
3138 | lookup_dnssec_authenticated = host->dnssec == DS_YES ? US"yes" |
3139 | : host->dnssec == DS_NO ? US"no" | |
3140 | : US""; | |
0756eb3c | 3141 | |
7cd1141b PH |
3142 | /* Set up a string for adding to the retry key if the port number is not |
3143 | the standard SMTP port. A host may have its own port setting that overrides | |
3144 | the default. */ | |
3145 | ||
3146 | pistring = string_sprintf(":%d", (host->port == PORT_NONE)? | |
3147 | port : host->port); | |
3148 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; | |
3149 | ||
0756eb3c PH |
3150 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface |
3151 | string changes upon expansion, we must add it to the key that is used for | |
3152 | retries, because connections to the same host from a different interface | |
3153 | should be treated separately. */ | |
3154 | ||
3155 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6; | |
3156 | if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges, | |
3157 | &interface, tid)) | |
3158 | return FALSE; | |
3159 | if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface); | |
3160 | ||
3161 | /* The first time round the outer loop, check the status of the host by | |
3162 | inspecting the retry data. The second time round, we are interested only | |
3163 | in expired hosts that haven't been tried since this message arrived. */ | |
3164 | ||
3165 | if (cutoff_retry == 0) | |
3166 | { | |
9c695f6d | 3167 | BOOL incl_ip; |
0756eb3c | 3168 | /* Ensure the status of the address is set by checking retry data if |
9c695f6d | 3169 | necessary. There may be host-specific retry data (applicable to all |
0756eb3c PH |
3170 | messages) and also data for retries of a specific message at this host. |
3171 | If either of these retry records are actually read, the keys used are | |
3172 | returned to save recomputing them later. */ | |
3173 | ||
9c695f6d JH |
3174 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, |
3175 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
3176 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
3177 | continue; /* with next host */ | |
3178 | ||
0756eb3c | 3179 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, |
9c695f6d | 3180 | incl_ip, &retry_host_key, &retry_message_key); |
0756eb3c PH |
3181 | |
3182 | DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name, | |
3183 | (host->address == NULL)? US"" : host->address, pistring, | |
3184 | (host->status == hstatus_usable)? "usable" : | |
3185 | (host->status == hstatus_unusable)? "unusable" : | |
3186 | (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?"); | |
3187 | ||
3188 | /* Skip this address if not usable at this time, noting if it wasn't | |
3189 | actually expired, both locally and in the address. */ | |
3190 | ||
3191 | switch (host->status) | |
3192 | { | |
3193 | case hstatus_unusable: | |
3194 | expired = FALSE; | |
3195 | setflag(addrlist, af_retry_skipped); | |
3196 | /* Fall through */ | |
3197 | ||
3198 | case hstatus_unusable_expired: | |
3199 | switch (host->why) | |
3200 | { | |
3201 | case hwhy_retry: hosts_retry++; break; | |
3202 | case hwhy_failed: hosts_fail++; break; | |
3203 | case hwhy_deferred: hosts_defer++; break; | |
3204 | } | |
3205 | ||
3206 | /* If there was a retry message key, implying that previously there | |
3207 | was a message-specific defer, we don't want to update the list of | |
f6c332bd | 3208 | messages waiting for these hosts. */ |
0756eb3c | 3209 | |
f6c332bd | 3210 | if (retry_message_key != NULL) update_waiting = FALSE; |
0756eb3c PH |
3211 | continue; /* With the next host or IP address */ |
3212 | } | |
3213 | } | |
3214 | ||
3215 | /* Second time round the loop: if the address is set but expired, and | |
3216 | the message is newer than the last try, let it through. */ | |
3217 | ||
3218 | else | |
3219 | { | |
3220 | if (host->address == NULL || | |
3221 | host->status != hstatus_unusable_expired || | |
3222 | host->last_try > received_time) | |
3223 | continue; | |
3224 | DEBUG(D_transport) | |
3225 | debug_printf("trying expired host %s [%s]%s\n", | |
3226 | host->name, host->address, pistring); | |
3227 | host_is_expired = TRUE; | |
3228 | } | |
3229 | ||
3230 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; | |
3231 | it remains TRUE only if all hosts are expired and none are actually tried. | |
3232 | */ | |
3233 | ||
3234 | expired = FALSE; | |
3235 | ||
3236 | /* If this host is listed as one to which access must be serialized, | |
3237 | see if another Exim process has a connection to it, and if so, skip | |
3238 | this host. If not, update the database to record our connection to it | |
3239 | and remember this for later deletion. Do not do any of this if we are | |
3240 | sending the message down a pre-existing connection. */ | |
3241 | ||
3242 | if (!continuing && | |
5130845b | 3243 | verify_check_given_host(&ob->serialize_hosts, host) == OK) |
0756eb3c PH |
3244 | { |
3245 | serialize_key = string_sprintf("host-serialize-%s", host->name); | |
3246 | if (!enq_start(serialize_key)) | |
3247 | { | |
3248 | DEBUG(D_transport) | |
3249 | debug_printf("skipping host %s because another Exim process " | |
3250 | "is connected to it\n", host->name); | |
3251 | hosts_serial++; | |
3252 | continue; | |
3253 | } | |
3254 | serialized = TRUE; | |
3255 | } | |
3256 | ||
3257 | /* OK, we have an IP address that is not waiting for its retry time to | |
3258 | arrive (it might be expired) OR (second time round the loop) we have an | |
3259 | expired host that hasn't been tried since the message arrived. Have a go | |
3260 | at delivering the message to it. First prepare the addresses by flushing | |
3261 | out the result of previous attempts, and finding the first address that | |
3262 | is still to be delivered. */ | |
3263 | ||
3264 | first_addr = prepare_addresses(addrlist, host); | |
3265 | ||
3266 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", | |
3267 | message_id, host->name, host->address, addrlist->address, | |
3268 | (addrlist->next == NULL)? "" : ", ..."); | |
3269 | ||
3270 | set_process_info("delivering %s to %s [%s] (%s%s)", | |
3271 | message_id, host->name, host->address, addrlist->address, | |
3272 | (addrlist->next == NULL)? "" : ", ..."); | |
3273 | ||
3274 | /* This is not for real; don't do the delivery. If there are | |
3275 | any remaining hosts, list them. */ | |
3276 | ||
3277 | if (dont_deliver) | |
3278 | { | |
3279 | host_item *host2; | |
c562fd30 | 3280 | set_errno(addrlist, 0, NULL, OK, FALSE, NULL); |
0756eb3c PH |
3281 | for (addr = addrlist; addr != NULL; addr = addr->next) |
3282 | { | |
3283 | addr->host_used = host; | |
3284 | addr->special_action = '*'; | |
3285 | addr->message = US"delivery bypassed by -N option"; | |
3286 | } | |
3287 | DEBUG(D_transport) | |
3288 | { | |
3289 | debug_printf("*** delivery by %s transport bypassed by -N option\n" | |
3290 | "*** host and remaining hosts:\n", tblock->name); | |
3291 | for (host2 = host; host2 != NULL; host2 = host2->next) | |
3292 | debug_printf(" %s [%s]\n", host2->name, | |
3293 | (host2->address == NULL)? US"unset" : host2->address); | |
3294 | } | |
3295 | rc = OK; | |
3296 | } | |
3297 | ||
3298 | /* This is for real. If the host is expired, we don't count it for | |
3299 | hosts_max_retry. This ensures that all hosts must expire before an address | |
8e669ac1 | 3300 | is timed out, unless hosts_max_try_hardlimit (which protects against |
533244af | 3301 | lunatic DNS configurations) is reached. |
8e669ac1 | 3302 | |
533244af PH |
3303 | If the host is not expired and we are about to hit the hosts_max_retry |
3304 | limit, check to see if there is a subsequent hosts with a different MX | |
3305 | value. If so, make that the next host, and don't count this one. This is a | |
3306 | heuristic to make sure that different MXs do get tried. With a normal kind | |
3307 | of retry rule, they would get tried anyway when the earlier hosts were | |
3308 | delayed, but if the domain has a "retry every time" type of rule - as is | |
3309 | often used for the the very large ISPs, that won't happen. */ | |
0756eb3c PH |
3310 | |
3311 | else | |
3312 | { | |
d427a7f9 JH |
3313 | host_item * thost; |
3314 | /* Make a copy of the host if it is local to this invocation | |
3315 | of the transport. */ | |
3316 | ||
3317 | if (expanded_hosts) | |
3318 | { | |
3319 | thost = store_get(sizeof(host_item)); | |
3320 | *thost = *host; | |
3321 | thost->name = string_copy(host->name); | |
3322 | thost->address = string_copy(host->address); | |
3323 | } | |
3324 | else | |
3325 | thost = host; | |
3326 | ||
0756eb3c PH |
3327 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) |
3328 | { | |
3329 | host_item *h; | |
3330 | DEBUG(D_transport) | |
3331 | debug_printf("hosts_max_try limit reached with this host\n"); | |
3332 | for (h = host; h != NULL; h = h->next) | |
3333 | if (h->mx != host->mx) break; | |
3334 | if (h != NULL) | |
3335 | { | |
3336 | nexthost = h; | |
3337 | unexpired_hosts_tried--; | |
3338 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " | |
3339 | "and will be tried\n"); | |
3340 | } | |
3341 | } | |
3342 | ||
3343 | /* Attempt the delivery. */ | |
3344 | ||
533244af | 3345 | total_hosts_tried++; |
d427a7f9 JH |
3346 | rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock, |
3347 | &message_defer, FALSE); | |
0756eb3c PH |
3348 | |
3349 | /* Yield is one of: | |
3350 | OK => connection made, each address contains its result; | |
3351 | message_defer is set for message-specific defers (when all | |
3352 | recipients are marked defer) | |
3353 | DEFER => there was a non-message-specific delivery problem; | |
3354 | ERROR => there was a problem setting up the arguments for a filter, | |
3355 | or there was a problem with expanding added headers | |
3356 | */ | |
3357 | ||
3358 | /* If the result is not OK, there was a non-message-specific problem. | |
3359 | If the result is DEFER, we need to write to the logs saying what happened | |
3360 | for this particular host, except in the case of authentication and TLS | |
3361 | failures, where the log has already been written. If all hosts defer a | |
3362 | general message is written at the end. */ | |
3363 | ||
3364 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL && | |
3365 | first_addr->basic_errno != ERRNO_TLSFAILURE) | |
3366 | write_logs(first_addr, host); | |
3367 | ||
774ef2d7 | 3368 | #ifdef EXPERIMENTAL_EVENT |
d68218c7 | 3369 | if (rc == DEFER) |
774ef2d7 | 3370 | deferred_event_raise(first_addr, host); |
a7538db1 | 3371 | #endif |
d68218c7 | 3372 | |
0756eb3c PH |
3373 | /* If STARTTLS was accepted, but there was a failure in setting up the |
3374 | TLS session (usually a certificate screwup), and the host is not in | |
3375 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with | |
3376 | TLS forcibly turned off. We have to start from scratch with a new SMTP | |
3377 | connection. That's why the retry is done from here, not from within | |
3378 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the | |
3379 | session, so the in-clear transmission after those errors, if permitted, | |
3380 | happens inside smtp_deliver().] */ | |
3381 | ||
a7538db1 | 3382 | #ifdef SUPPORT_TLS |
7a31d643 JH |
3383 | if ( rc == DEFER |
3384 | && first_addr->basic_errno == ERRNO_TLSFAILURE | |
3385 | && ob->tls_tempfail_tryclear | |
5130845b | 3386 | && verify_check_given_host(&ob->hosts_require_tls, host) != OK |
7a31d643 | 3387 | ) |
0756eb3c PH |
3388 | { |
3389 | log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted " | |
3390 | "to %s [%s] (not in hosts_require_tls)", host->name, host->address); | |
3391 | first_addr = prepare_addresses(addrlist, host); | |
d427a7f9 JH |
3392 | rc = smtp_deliver(addrlist, thost, host_af, port, interface, tblock, |
3393 | &message_defer, TRUE); | |
0756eb3c PH |
3394 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) |
3395 | write_logs(first_addr, host); | |
774ef2d7 | 3396 | # ifdef EXPERIMENTAL_EVENT |
d68218c7 | 3397 | if (rc == DEFER) |
774ef2d7 | 3398 | deferred_event_raise(first_addr, host); |
a7538db1 | 3399 | # endif |
0756eb3c | 3400 | } |
a1bccd48 | 3401 | #endif /*SUPPORT_TLS*/ |
0756eb3c PH |
3402 | } |
3403 | ||
3404 | /* Delivery attempt finished */ | |
3405 | ||
3406 | rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)? | |
3407 | US"ERROR" : US"?"; | |
3408 | ||
3409 | set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s", | |
3410 | message_id, host->name, host->address, addrlist->address, | |
3411 | (addrlist->next == NULL)? "" : " (& others)", rs); | |
3412 | ||
3413 | /* Release serialization if set up */ | |
3414 | ||
3415 | if (serialized) enq_end(serialize_key); | |
3416 | ||
3417 | /* If the result is DEFER, or if a host retry record is known to exist, we | |
3418 | need to add an item to the retry chain for updating the retry database | |
3419 | at the end of delivery. We only need to add the item to the top address, | |
3420 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it | |
3421 | for any other delivery attempts using the same address. (It is copied into | |
3422 | the unusable tree at the outer level, so even if different address blocks | |
3423 | contain the same address, it still won't get tried again.) */ | |
3424 | ||
3425 | if (rc == DEFER || retry_host_key != NULL) | |
3426 | { | |
3427 | int delete_flag = (rc != DEFER)? rf_delete : 0; | |
3428 | if (retry_host_key == NULL) | |
3429 | { | |
9c695f6d JH |
3430 | BOOL incl_ip; |
3431 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, | |
3432 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
3433 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
3434 | incl_ip = TRUE; /* error; use most-specific retry record */ | |
3435 | ||
3436 | retry_host_key = incl_ip ? | |
0756eb3c PH |
3437 | string_sprintf("T:%S:%s%s", host->name, host->address, pistring) : |
3438 | string_sprintf("T:%S%s", host->name, pistring); | |
3439 | } | |
3440 | ||
3441 | /* If a delivery of another message over an existing SMTP connection | |
3442 | yields DEFER, we do NOT set up retry data for the host. This covers the | |
3443 | case when there are delays in routing the addresses in the second message | |
3444 | that are so long that the server times out. This is alleviated by not | |
3445 | routing addresses that previously had routing defers when handling an | |
3446 | existing connection, but even so, this case may occur (e.g. if a | |
3447 | previously happily routed address starts giving routing defers). If the | |
3448 | host is genuinely down, another non-continued message delivery will | |
3449 | notice it soon enough. */ | |
3450 | ||
3451 | if (delete_flag != 0 || !continuing) | |
3452 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); | |
3453 | ||
3454 | /* We may have tried an expired host, if its retry time has come; ensure | |
3455 | the status reflects the expiry for the benefit of any other addresses. */ | |
3456 | ||
3457 | if (rc == DEFER) | |
3458 | { | |
3459 | host->status = (host_is_expired)? | |
3460 | hstatus_unusable_expired : hstatus_unusable; | |
3461 | host->why = hwhy_deferred; | |
3462 | } | |
3463 | } | |
3464 | ||
3465 | /* If message_defer is set (host was OK, but every recipient got deferred | |
3466 | because of some message-specific problem), or if that had happened | |
3467 | previously so that a message retry key exists, add an appropriate item | |
3468 | to the retry chain. Note that if there was a message defer but now there is | |
3469 | a host defer, the message defer record gets deleted. That seems perfectly | |
3470 | reasonable. Also, stop the message from being remembered as waiting | |
f6c332bd | 3471 | for specific hosts. */ |
0756eb3c PH |
3472 | |
3473 | if (message_defer || retry_message_key != NULL) | |
3474 | { | |
3475 | int delete_flag = message_defer? 0 : rf_delete; | |
3476 | if (retry_message_key == NULL) | |
3477 | { | |
9c695f6d JH |
3478 | BOOL incl_ip; |
3479 | if (exp_bool(addrlist, US"transport", tblock->name, D_transport, | |
3480 | US"retry_include_ip_address", ob->retry_include_ip_address, | |
3481 | ob->expand_retry_include_ip_address, &incl_ip) != OK) | |
3482 | incl_ip = TRUE; /* error; use most-specific retry record */ | |
3483 | ||
3484 | retry_message_key = incl_ip ? | |
0756eb3c PH |
3485 | string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, |
3486 | message_id) : | |
3487 | string_sprintf("T:%S%s:%s", host->name, pistring, message_id); | |
3488 | } | |
3489 | retry_add_item(addrlist, retry_message_key, | |
3490 | rf_message | rf_host | delete_flag); | |
f6c332bd | 3491 | update_waiting = FALSE; |
0756eb3c PH |
3492 | } |
3493 | ||
3494 | /* Any return other than DEFER (that is, OK or ERROR) means that the | |
3495 | addresses have got their final statuses filled in for this host. In the OK | |
3496 | case, see if any of them are deferred. */ | |
3497 | ||
3498 | if (rc == OK) | |
3499 | { | |
3500 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3501 | { | |
3502 | if (addr->transport_return == DEFER) | |
3503 | { | |
3504 | some_deferred = TRUE; | |
3505 | break; | |
3506 | } | |
3507 | } | |
3508 | } | |
3509 | ||
3510 | /* If no addresses deferred or the result was ERROR, return. We do this for | |
3511 | ERROR because a failing filter set-up or add_headers expansion is likely to | |
3512 | fail for any host we try. */ | |
3513 | ||
3514 | if (rc == ERROR || (rc == OK && !some_deferred)) | |
3515 | { | |
3516 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
3517 | return TRUE; /* Each address has its status */ | |
3518 | } | |
3519 | ||
3520 | /* If the result was DEFER or some individual addresses deferred, let | |
3521 | the loop run to try other hosts with the deferred addresses, except for the | |
3522 | case when we were trying to deliver down an existing channel and failed. | |
3523 | Don't try any other hosts in this case. */ | |
3524 | ||
3525 | if (continuing) break; | |
3526 | ||
3527 | /* If the whole delivery, or some individual addresses, were deferred and | |
3528 | there are more hosts that could be tried, do not count this host towards | |
3529 | the hosts_max_try limit if the age of the message is greater than the | |
3530 | maximum retry time for this host. This means we may try try all hosts, | |
3531 | ignoring the limit, when messages have been around for some time. This is | |
3532 | important because if we don't try all hosts, the address will never time | |
533244af | 3533 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ |
0756eb3c PH |
3534 | |
3535 | if ((rc == DEFER || some_deferred) && nexthost != NULL) | |
3536 | { | |
3537 | BOOL timedout; | |
3538 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); | |
3539 | ||
3540 | if (retry != NULL && retry->rules != NULL) | |
3541 | { | |
3542 | retry_rule *last_rule; | |
3543 | for (last_rule = retry->rules; | |
3544 | last_rule->next != NULL; | |
3545 | last_rule = last_rule->next); | |
3546 | timedout = time(NULL) - received_time > last_rule->timeout; | |
3547 | } | |
3548 | else timedout = TRUE; /* No rule => timed out */ | |
3549 | ||
3550 | if (timedout) | |
3551 | { | |
3552 | unexpired_hosts_tried--; | |
3553 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " | |
3554 | "hosts_max_try (message older than host's retry time)\n"); | |
3555 | } | |
3556 | } | |
3557 | } /* End of loop for trying multiple hosts. */ | |
3558 | ||
3559 | /* This is the end of the loop that repeats iff expired is TRUE and | |
3560 | ob->delay_after_cutoff is FALSE. The second time round we will | |
3561 | try those hosts that haven't been tried since the message arrived. */ | |
3562 | ||
3563 | DEBUG(D_transport) | |
3564 | { | |
3565 | debug_printf("all IP addresses skipped or deferred at least one address\n"); | |
3566 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) | |
3567 | debug_printf("retrying IP addresses not tried since message arrived\n"); | |
3568 | } | |
3569 | } | |
3570 | ||
3571 | ||
3572 | /* Get here if all IP addresses are skipped or defer at least one address. In | |
3573 | MUA wrapper mode, this will happen only for connection or other non-message- | |
3574 | specific failures. Force the delivery status for all addresses to FAIL. */ | |
3575 | ||
3576 | if (mua_wrapper) | |
3577 | { | |
3578 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3579 | addr->transport_return = FAIL; | |
3580 | goto END_TRANSPORT; | |
3581 | } | |
3582 | ||
3583 | /* In the normal, non-wrapper case, add a standard message to each deferred | |
3584 | address if there hasn't been an error, that is, if it hasn't actually been | |
3585 | tried this time. The variable "expired" will be FALSE if any deliveries were | |
3586 | actually tried, or if there was at least one host that was not expired. That | |
3587 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If | |
3588 | a delivery has been tried, an error code will be set, and the failing of the | |
3589 | message is handled by the retry code later. | |
3590 | ||
3591 | If queue_smtp is set, or this transport was called to send a subsequent message | |
3592 | down an existing TCP/IP connection, and something caused the host not to be | |
3593 | found, we end up here, but can detect these cases and handle them specially. */ | |
3594 | ||
3595 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
3596 | { | |
3597 | /* If host is not NULL, it means that we stopped processing the host list | |
533244af PH |
3598 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this |
3599 | means we need to behave as if some hosts were skipped because their retry | |
3600 | time had not come. Specifically, this prevents the address from timing out. | |
8e669ac1 | 3601 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all |
533244af | 3602 | hosts were tried. */ |
0756eb3c PH |
3603 | |
3604 | if (host != NULL) | |
3605 | { | |
533244af PH |
3606 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
3607 | { | |
3608 | DEBUG(D_transport) | |
3609 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " | |
3610 | "hosts were tried\n"); | |
3611 | } | |
3612 | else | |
8e669ac1 | 3613 | { |
533244af PH |
3614 | DEBUG(D_transport) |
3615 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); | |
3616 | setflag(addr, af_retry_skipped); | |
8e669ac1 | 3617 | } |
0756eb3c PH |
3618 | } |
3619 | ||
3620 | if (queue_smtp) /* no deliveries attempted */ | |
3621 | { | |
3622 | addr->transport_return = DEFER; | |
3623 | addr->basic_errno = 0; | |
3624 | addr->message = US"SMTP delivery explicitly queued"; | |
3625 | } | |
3626 | ||
3627 | else if (addr->transport_return == DEFER && | |
3628 | (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) && | |
3629 | addr->message == NULL) | |
3630 | { | |
3631 | addr->basic_errno = ERRNO_HRETRY; | |
3632 | if (continue_hostname != NULL) | |
3633 | { | |
3634 | addr->message = US"no host found for existing SMTP connection"; | |
3635 | } | |
3636 | else if (expired) | |
3637 | { | |
fffffe4c | 3638 | setflag(addr, af_pass_message); /* This is not a security risk */ |
0756eb3c PH |
3639 | addr->message = (ob->delay_after_cutoff)? |
3640 | US"retry time not reached for any host after a long failure period" : | |
3641 | US"all hosts have been failing for a long time and were last tried " | |
3642 | "after this message arrived"; | |
3643 | ||
3644 | /* If we are already using fallback hosts, or there are no fallback hosts | |
3645 | defined, convert the result to FAIL to cause a bounce. */ | |
3646 | ||
3647 | if (addr->host_list == addr->fallback_hosts || | |
3648 | addr->fallback_hosts == NULL) | |
3649 | addr->transport_return = FAIL; | |
3650 | } | |
3651 | else | |
3652 | { | |
3653 | if (hosts_retry == hosts_total) | |
3654 | addr->message = US"retry time not reached for any host"; | |
3655 | else if (hosts_fail == hosts_total) | |
3656 | addr->message = US"all host address lookups failed permanently"; | |
3657 | else if (hosts_defer == hosts_total) | |
3658 | addr->message = US"all host address lookups failed temporarily"; | |
3659 | else if (hosts_serial == hosts_total) | |
3660 | addr->message = US"connection limit reached for all hosts"; | |
3661 | else if (hosts_fail+hosts_defer == hosts_total) | |
3662 | addr->message = US"all host address lookups failed"; | |
3663 | else addr->message = US"some host address lookups failed and retry time " | |
3664 | "not reached for other hosts or connection limit reached"; | |
3665 | } | |
3666 | } | |
3667 | } | |
3668 | ||
3669 | /* Update the database which keeps information about which messages are waiting | |
f6c332bd PH |
3670 | for which hosts to become available. For some message-specific errors, the |
3671 | update_waiting flag is turned off because we don't want follow-on deliveries in | |
ea722490 | 3672 | those cases. If this transport instance is explicitly limited to one message |
8b260705 PP |
3673 | per connection then follow-on deliveries are not possible and there's no need |
3674 | to create/update the per-transport wait-<transport_name> database. */ | |
0756eb3c | 3675 | |
ea722490 JH |
3676 | if (update_waiting && tblock->connection_max_messages != 1) |
3677 | transport_update_waiting(hostlist, tblock->name); | |
0756eb3c PH |
3678 | |
3679 | END_TRANSPORT: | |
3680 | ||
3681 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
3682 | ||
3683 | return TRUE; /* Each address has its status */ | |
3684 | } | |
3685 | ||
578897ea JH |
3686 | /* vi: aw ai sw=2 |
3687 | */ | |
0756eb3c | 3688 | /* End of transport/smtp.c */ |