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54fc8428 | 1 | /* $Cambridge: exim/src/src/transports/smtp.c,v 1.32 2007/01/22 16:29:55 ph10 Exp $ */ |
0756eb3c PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
184e8823 | 7 | /* Copyright (c) University of Cambridge 1995 - 2007 */ |
0756eb3c PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | #include "../exim.h" | |
11 | #include "smtp.h" | |
12 | ||
13 | #define PENDING 256 | |
14 | #define PENDING_DEFER (PENDING + DEFER) | |
15 | #define PENDING_OK (PENDING + OK) | |
16 | ||
17 | ||
18 | /* Options specific to the smtp transport. This transport also supports LMTP | |
19 | over TCP/IP. The options must be in alphabetic order (note that "_" comes | |
20 | before the lower case letters). Some live in the transport_instance block so as | |
21 | to be publicly visible; these are flagged with opt_public. */ | |
22 | ||
23 | optionlist smtp_transport_options[] = { | |
48c7f9e2 PH |
24 | { "address_retry_include_sender", opt_bool, |
25 | (void *)offsetof(smtp_transport_options_block, address_retry_include_sender) }, | |
0756eb3c PH |
26 | { "allow_localhost", opt_bool, |
27 | (void *)offsetof(smtp_transport_options_block, allow_localhost) }, | |
28 | { "authenticated_sender", opt_stringptr, | |
29 | (void *)offsetof(smtp_transport_options_block, authenticated_sender) }, | |
382afc6b PH |
30 | { "authenticated_sender_force", opt_bool, |
31 | (void *)offsetof(smtp_transport_options_block, authenticated_sender_force) }, | |
0756eb3c PH |
32 | { "command_timeout", opt_time, |
33 | (void *)offsetof(smtp_transport_options_block, command_timeout) }, | |
34 | { "connect_timeout", opt_time, | |
35 | (void *)offsetof(smtp_transport_options_block, connect_timeout) }, | |
36 | { "connection_max_messages", opt_int | opt_public, | |
37 | (void *)offsetof(transport_instance, connection_max_messages) }, | |
38 | { "data_timeout", opt_time, | |
39 | (void *)offsetof(smtp_transport_options_block, data_timeout) }, | |
40 | { "delay_after_cutoff", opt_bool, | |
41 | (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) }, | |
fb2274d4 TK |
42 | #ifdef EXPERIMENTAL_DOMAINKEYS |
43 | { "dk_canon", opt_stringptr, | |
44 | (void *)offsetof(smtp_transport_options_block, dk_canon) }, | |
45 | { "dk_domain", opt_stringptr, | |
46 | (void *)offsetof(smtp_transport_options_block, dk_domain) }, | |
47 | { "dk_headers", opt_stringptr, | |
48 | (void *)offsetof(smtp_transport_options_block, dk_headers) }, | |
49 | { "dk_private_key", opt_stringptr, | |
50 | (void *)offsetof(smtp_transport_options_block, dk_private_key) }, | |
51 | { "dk_selector", opt_stringptr, | |
52 | (void *)offsetof(smtp_transport_options_block, dk_selector) }, | |
53 | { "dk_strict", opt_stringptr, | |
54 | (void *)offsetof(smtp_transport_options_block, dk_strict) }, | |
55 | #endif | |
0756eb3c PH |
56 | { "dns_qualify_single", opt_bool, |
57 | (void *)offsetof(smtp_transport_options_block, dns_qualify_single) }, | |
58 | { "dns_search_parents", opt_bool, | |
59 | (void *)offsetof(smtp_transport_options_block, dns_search_parents) }, | |
60 | { "fallback_hosts", opt_stringptr, | |
61 | (void *)offsetof(smtp_transport_options_block, fallback_hosts) }, | |
62 | { "final_timeout", opt_time, | |
63 | (void *)offsetof(smtp_transport_options_block, final_timeout) }, | |
64 | { "gethostbyname", opt_bool, | |
65 | (void *)offsetof(smtp_transport_options_block, gethostbyname) }, | |
83da1223 PH |
66 | #ifdef SUPPORT_TLS |
67 | { "gnutls_require_kx", opt_stringptr, | |
68 | (void *)offsetof(smtp_transport_options_block, gnutls_require_kx) }, | |
69 | { "gnutls_require_mac", opt_stringptr, | |
70 | (void *)offsetof(smtp_transport_options_block, gnutls_require_mac) }, | |
71 | { "gnutls_require_protocols", opt_stringptr, | |
72 | (void *)offsetof(smtp_transport_options_block, gnutls_require_proto) }, | |
73 | #endif | |
0756eb3c PH |
74 | { "helo_data", opt_stringptr, |
75 | (void *)offsetof(smtp_transport_options_block, helo_data) }, | |
76 | { "hosts", opt_stringptr, | |
77 | (void *)offsetof(smtp_transport_options_block, hosts) }, | |
78 | { "hosts_avoid_esmtp", opt_stringptr, | |
79 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) }, | |
80 | #ifdef SUPPORT_TLS | |
81 | { "hosts_avoid_tls", opt_stringptr, | |
82 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) }, | |
83 | #endif | |
84 | { "hosts_max_try", opt_int, | |
85 | (void *)offsetof(smtp_transport_options_block, hosts_max_try) }, | |
533244af PH |
86 | { "hosts_max_try_hardlimit", opt_int, |
87 | (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) }, | |
0756eb3c PH |
88 | #ifdef SUPPORT_TLS |
89 | { "hosts_nopass_tls", opt_stringptr, | |
90 | (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) }, | |
91 | #endif | |
92 | { "hosts_override", opt_bool, | |
93 | (void *)offsetof(smtp_transport_options_block, hosts_override) }, | |
94 | { "hosts_randomize", opt_bool, | |
95 | (void *)offsetof(smtp_transport_options_block, hosts_randomize) }, | |
96 | { "hosts_require_auth", opt_stringptr, | |
97 | (void *)offsetof(smtp_transport_options_block, hosts_require_auth) }, | |
98 | #ifdef SUPPORT_TLS | |
99 | { "hosts_require_tls", opt_stringptr, | |
100 | (void *)offsetof(smtp_transport_options_block, hosts_require_tls) }, | |
101 | #endif | |
102 | { "hosts_try_auth", opt_stringptr, | |
103 | (void *)offsetof(smtp_transport_options_block, hosts_try_auth) }, | |
104 | { "interface", opt_stringptr, | |
105 | (void *)offsetof(smtp_transport_options_block, interface) }, | |
106 | { "keepalive", opt_bool, | |
107 | (void *)offsetof(smtp_transport_options_block, keepalive) }, | |
f1513293 PH |
108 | { "lmtp_ignore_quota", opt_bool, |
109 | (void *)offsetof(smtp_transport_options_block, lmtp_ignore_quota) }, | |
0756eb3c PH |
110 | { "max_rcpt", opt_int | opt_public, |
111 | (void *)offsetof(transport_instance, max_addresses) }, | |
112 | { "multi_domain", opt_bool | opt_public, | |
113 | (void *)offsetof(transport_instance, multi_domain) }, | |
114 | { "port", opt_stringptr, | |
115 | (void *)offsetof(smtp_transport_options_block, port) }, | |
116 | { "protocol", opt_stringptr, | |
117 | (void *)offsetof(smtp_transport_options_block, protocol) }, | |
118 | { "retry_include_ip_address", opt_bool, | |
119 | (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) }, | |
120 | { "serialize_hosts", opt_stringptr, | |
121 | (void *)offsetof(smtp_transport_options_block, serialize_hosts) }, | |
122 | { "size_addition", opt_int, | |
123 | (void *)offsetof(smtp_transport_options_block, size_addition) } | |
124 | #ifdef SUPPORT_TLS | |
125 | ,{ "tls_certificate", opt_stringptr, | |
126 | (void *)offsetof(smtp_transport_options_block, tls_certificate) }, | |
127 | { "tls_crl", opt_stringptr, | |
128 | (void *)offsetof(smtp_transport_options_block, tls_crl) }, | |
129 | { "tls_privatekey", opt_stringptr, | |
130 | (void *)offsetof(smtp_transport_options_block, tls_privatekey) }, | |
131 | { "tls_require_ciphers", opt_stringptr, | |
132 | (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) }, | |
133 | { "tls_tempfail_tryclear", opt_bool, | |
134 | (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) }, | |
135 | { "tls_verify_certificates", opt_stringptr, | |
136 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) } | |
137 | #endif | |
138 | }; | |
139 | ||
140 | /* Size of the options list. An extern variable has to be used so that its | |
141 | address can appear in the tables drtables.c. */ | |
142 | ||
143 | int smtp_transport_options_count = | |
144 | sizeof(smtp_transport_options)/sizeof(optionlist); | |
145 | ||
146 | /* Default private options block for the smtp transport. */ | |
147 | ||
148 | smtp_transport_options_block smtp_transport_option_defaults = { | |
149 | NULL, /* hosts */ | |
150 | NULL, /* fallback_hosts */ | |
151 | NULL, /* hostlist */ | |
152 | NULL, /* fallback_hostlist */ | |
153 | NULL, /* authenticated_sender */ | |
154 | US"$primary_hostname", /* helo_data */ | |
155 | NULL, /* interface */ | |
156 | NULL, /* port */ | |
157 | US"smtp", /* protocol */ | |
158 | NULL, /* serialize_hosts */ | |
159 | NULL, /* hosts_try_auth */ | |
160 | NULL, /* hosts_require_auth */ | |
161 | NULL, /* hosts_require_tls */ | |
162 | NULL, /* hosts_avoid_tls */ | |
163 | NULL, /* hosts_avoid_esmtp */ | |
164 | NULL, /* hosts_nopass_tls */ | |
165 | 5*60, /* command_timeout */ | |
166 | 5*60, /* connect_timeout; shorter system default overrides */ | |
167 | 5*60, /* data timeout */ | |
168 | 10*60, /* final timeout */ | |
169 | 1024, /* size_addition */ | |
170 | 5, /* hosts_max_try */ | |
8e669ac1 | 171 | 50, /* hosts_max_try_hardlimit */ |
48c7f9e2 | 172 | TRUE, /* address_retry_include_sender */ |
0756eb3c | 173 | FALSE, /* allow_localhost */ |
382afc6b | 174 | FALSE, /* authenticated_sender_force */ |
0756eb3c PH |
175 | FALSE, /* gethostbyname */ |
176 | TRUE, /* dns_qualify_single */ | |
177 | FALSE, /* dns_search_parents */ | |
178 | TRUE, /* delay_after_cutoff */ | |
179 | FALSE, /* hosts_override */ | |
180 | FALSE, /* hosts_randomize */ | |
181 | TRUE, /* keepalive */ | |
f1513293 | 182 | FALSE, /* lmtp_ignore_quota */ |
0756eb3c PH |
183 | TRUE /* retry_include_ip_address */ |
184 | #ifdef SUPPORT_TLS | |
185 | ,NULL, /* tls_certificate */ | |
186 | NULL, /* tls_crl */ | |
187 | NULL, /* tls_privatekey */ | |
188 | NULL, /* tls_require_ciphers */ | |
83da1223 PH |
189 | NULL, /* gnutls_require_kx */ |
190 | NULL, /* gnutls_require_mac */ | |
191 | NULL, /* gnutls_require_proto */ | |
0756eb3c PH |
192 | NULL, /* tls_verify_certificates */ |
193 | TRUE /* tls_tempfail_tryclear */ | |
194 | #endif | |
fb2274d4 TK |
195 | #ifdef EXPERIMENTAL_DOMAINKEYS |
196 | ,NULL, /* dk_canon */ | |
197 | NULL, /* dk_domain */ | |
198 | NULL, /* dk_headers */ | |
199 | NULL, /* dk_private_key */ | |
200 | NULL, /* dk_selector */ | |
201 | NULL /* dk_strict */ | |
202 | #endif | |
0756eb3c PH |
203 | }; |
204 | ||
205 | ||
206 | /* Local statics */ | |
207 | ||
208 | static uschar *smtp_command; /* Points to last cmd for error messages */ | |
209 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ | |
f6c332bd | 210 | static BOOL update_waiting; /* TRUE to update the "wait" database */ |
0756eb3c PH |
211 | |
212 | ||
213 | /************************************************* | |
214 | * Setup entry point * | |
215 | *************************************************/ | |
216 | ||
217 | /* This function is called when the transport is about to be used, | |
218 | but before running it in a sub-process. It is used for two things: | |
219 | ||
220 | (1) To set the fallback host list in addresses, when delivering. | |
26da7e20 PH |
221 | (2) To pass back the interface, port, protocol, and other options, for use |
222 | during callout verification. | |
0756eb3c PH |
223 | |
224 | Arguments: | |
225 | tblock pointer to the transport instance block | |
226 | addrlist list of addresses about to be transported | |
227 | tf if not NULL, pointer to block in which to return options | |
929ba01c PH |
228 | uid the uid that will be set (not used) |
229 | gid the gid that will be set (not used) | |
0756eb3c PH |
230 | errmsg place for error message (not used) |
231 | ||
232 | Returns: OK always (FAIL, DEFER not used) | |
233 | */ | |
234 | ||
235 | static int | |
236 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, | |
929ba01c | 237 | transport_feedback *tf, uid_t uid, gid_t gid, uschar **errmsg) |
0756eb3c PH |
238 | { |
239 | smtp_transport_options_block *ob = | |
240 | (smtp_transport_options_block *)(tblock->options_block); | |
241 | ||
242 | errmsg = errmsg; /* Keep picky compilers happy */ | |
929ba01c PH |
243 | uid = uid; |
244 | gid = gid; | |
0756eb3c PH |
245 | |
246 | /* Pass back options if required. This interface is getting very messy. */ | |
247 | ||
248 | if (tf != NULL) | |
249 | { | |
250 | tf->interface = ob->interface; | |
251 | tf->port = ob->port; | |
252 | tf->protocol = ob->protocol; | |
253 | tf->hosts = ob->hosts; | |
254 | tf->hosts_override = ob->hosts_override; | |
255 | tf->hosts_randomize = ob->hosts_randomize; | |
256 | tf->gethostbyname = ob->gethostbyname; | |
257 | tf->qualify_single = ob->dns_qualify_single; | |
258 | tf->search_parents = ob->dns_search_parents; | |
26da7e20 | 259 | tf->helo_data = ob->helo_data; |
0756eb3c PH |
260 | } |
261 | ||
262 | /* Set the fallback host list for all the addresses that don't have fallback | |
263 | host lists, provided that the local host wasn't present in the original host | |
264 | list. */ | |
265 | ||
266 | if (!testflag(addrlist, af_local_host_removed)) | |
267 | { | |
268 | for (; addrlist != NULL; addrlist = addrlist->next) | |
269 | if (addrlist->fallback_hosts == NULL) | |
270 | addrlist->fallback_hosts = ob->fallback_hostlist; | |
271 | } | |
272 | ||
273 | return OK; | |
274 | } | |
275 | ||
276 | ||
277 | ||
278 | /************************************************* | |
279 | * Initialization entry point * | |
280 | *************************************************/ | |
281 | ||
282 | /* Called for each instance, after its options have been read, to | |
283 | enable consistency checks to be done, or anything else that needs | |
284 | to be set up. | |
285 | ||
286 | Argument: pointer to the transport instance block | |
287 | Returns: nothing | |
288 | */ | |
289 | ||
290 | void | |
291 | smtp_transport_init(transport_instance *tblock) | |
292 | { | |
293 | smtp_transport_options_block *ob = | |
294 | (smtp_transport_options_block *)(tblock->options_block); | |
295 | ||
296 | /* Retry_use_local_part defaults FALSE if unset */ | |
297 | ||
298 | if (tblock->retry_use_local_part == TRUE_UNSET) | |
299 | tblock->retry_use_local_part = FALSE; | |
300 | ||
301 | /* Set the default port according to the protocol */ | |
302 | ||
303 | if (ob->port == NULL) | |
304 | ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : US"smtp"; | |
305 | ||
306 | /* Set up the setup entry point, to be called before subprocesses for this | |
307 | transport. */ | |
308 | ||
309 | tblock->setup = smtp_transport_setup; | |
310 | ||
311 | /* Complain if any of the timeouts are zero. */ | |
312 | ||
313 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || | |
314 | ob->final_timeout <= 0) | |
315 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
316 | "command, data, or final timeout value is zero for %s transport", | |
317 | tblock->name); | |
318 | ||
319 | /* If hosts_override is set and there are local hosts, set the global | |
320 | flag that stops verify from showing router hosts. */ | |
321 | ||
322 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; | |
323 | ||
324 | /* If there are any fallback hosts listed, build a chain of host items | |
325 | for them, but do not do any lookups at this time. */ | |
326 | ||
327 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); | |
328 | } | |
329 | ||
330 | ||
331 | ||
332 | ||
333 | ||
334 | /************************************************* | |
335 | * Set delivery info into all active addresses * | |
336 | *************************************************/ | |
337 | ||
338 | /* Only addresses whose status is >= PENDING are relevant. A lesser | |
339 | status means that an address is not currently being processed. | |
340 | ||
341 | Arguments: | |
447d236c PH |
342 | addrlist points to a chain of addresses |
343 | errno_value to put in each address's errno field | |
344 | msg to put in each address's message field | |
345 | rc to put in each address's transport_return field | |
346 | pass_message if TRUE, set the "pass message" flag in the address | |
0756eb3c PH |
347 | |
348 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in | |
349 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate | |
350 | this particular type of timeout. | |
351 | ||
352 | Returns: nothing | |
353 | */ | |
354 | ||
7cd1141b PH |
355 | static void |
356 | set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc, | |
447d236c | 357 | BOOL pass_message) |
0756eb3c PH |
358 | { |
359 | address_item *addr; | |
360 | int orvalue = 0; | |
361 | if (errno_value == ERRNO_CONNECTTIMEOUT) | |
362 | { | |
363 | errno_value = ETIMEDOUT; | |
364 | orvalue = RTEF_CTOUT; | |
365 | } | |
366 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
367 | { | |
368 | if (addr->transport_return < PENDING) continue; | |
369 | addr->basic_errno = errno_value; | |
370 | addr->more_errno |= orvalue; | |
447d236c PH |
371 | if (msg != NULL) |
372 | { | |
373 | addr->message = msg; | |
374 | if (pass_message) setflag(addr, af_pass_message); | |
375 | } | |
0756eb3c PH |
376 | addr->transport_return = rc; |
377 | } | |
378 | } | |
379 | ||
380 | ||
381 | ||
382 | /************************************************* | |
383 | * Check an SMTP response * | |
384 | *************************************************/ | |
385 | ||
386 | /* This function is given an errno code and the SMTP response buffer | |
387 | to analyse, together with the host identification for generating messages. It | |
388 | sets an appropriate message and puts the first digit of the response code into | |
389 | the yield variable. If no response was actually read, a suitable digit is | |
390 | chosen. | |
391 | ||
392 | Arguments: | |
447d236c PH |
393 | host the current host, to get its name for messages |
394 | errno_value pointer to the errno value | |
395 | more_errno from the top address for use with ERRNO_FILTER_FAIL | |
396 | buffer the SMTP response buffer | |
397 | yield where to put a one-digit SMTP response code | |
398 | message where to put an errror message | |
399 | pass_message set TRUE if message is an SMTP response | |
400 | ||
401 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE | |
0756eb3c PH |
402 | */ |
403 | ||
404 | static BOOL check_response(host_item *host, int *errno_value, int more_errno, | |
447d236c | 405 | uschar *buffer, int *yield, uschar **message, BOOL *pass_message) |
0756eb3c PH |
406 | { |
407 | uschar *pl = US""; | |
408 | ||
409 | if (smtp_use_pipelining && | |
410 | (Ustrcmp(smtp_command, "MAIL") == 0 || | |
411 | Ustrcmp(smtp_command, "RCPT") == 0 || | |
412 | Ustrcmp(smtp_command, "DATA") == 0)) | |
413 | pl = US"pipelined "; | |
414 | ||
415 | *yield = '4'; /* Default setting is to give a temporary error */ | |
416 | ||
417 | /* Handle response timeout */ | |
418 | ||
419 | if (*errno_value == ETIMEDOUT) | |
420 | { | |
421 | *message = US string_sprintf("SMTP timeout while connected to %s [%s] " | |
422 | "after %s%s", host->name, host->address, pl, smtp_command); | |
423 | if (transport_count > 0) | |
424 | *message = US string_sprintf("%s (%d bytes written)", *message, | |
425 | transport_count); | |
426 | return FALSE; | |
427 | } | |
428 | ||
429 | /* Handle malformed SMTP response */ | |
430 | ||
431 | if (*errno_value == ERRNO_SMTPFORMAT) | |
432 | { | |
433 | uschar *malfresp = string_printing(buffer); | |
434 | while (isspace(*malfresp)) malfresp++; | |
435 | if (*malfresp == 0) | |
436 | *message = string_sprintf("Malformed SMTP reply (an empty line) from " | |
437 | "%s [%s] in response to %s%s", host->name, host->address, pl, | |
438 | smtp_command); | |
439 | else | |
440 | *message = string_sprintf("Malformed SMTP reply from %s [%s] in response " | |
441 | "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp); | |
442 | return FALSE; | |
443 | } | |
444 | ||
445 | /* Handle a failed filter process error; can't send QUIT as we mustn't | |
446 | end the DATA. */ | |
447 | ||
448 | if (*errno_value == ERRNO_FILTER_FAIL) | |
449 | { | |
35af9f61 | 450 | *message = US string_sprintf("transport filter process failed (%d)%s", |
8e669ac1 | 451 | more_errno, |
35af9f61 | 452 | (more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); |
0756eb3c PH |
453 | return FALSE; |
454 | } | |
455 | ||
456 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't | |
457 | end the DATA. */ | |
458 | ||
459 | if (*errno_value == ERRNO_CHHEADER_FAIL) | |
460 | { | |
461 | *message = | |
462 | US string_sprintf("failed to expand headers_add or headers_remove: %s", | |
463 | expand_string_message); | |
464 | return FALSE; | |
465 | } | |
466 | ||
467 | /* Handle failure to write a complete data block */ | |
468 | ||
469 | if (*errno_value == ERRNO_WRITEINCOMPLETE) | |
470 | { | |
471 | *message = US string_sprintf("failed to write a data block"); | |
472 | return FALSE; | |
473 | } | |
474 | ||
475 | /* Handle error responses from the remote mailer. */ | |
476 | ||
477 | if (buffer[0] != 0) | |
478 | { | |
479 | uschar *s = string_printing(buffer); | |
447d236c | 480 | *message = US string_sprintf("SMTP error from remote mail server after %s%s: " |
0756eb3c | 481 | "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s); |
447d236c | 482 | *pass_message = TRUE; |
0756eb3c PH |
483 | *yield = buffer[0]; |
484 | return TRUE; | |
485 | } | |
486 | ||
487 | /* No data was read. If there is no errno, this must be the EOF (i.e. | |
19b9dc85 PH |
488 | connection closed) case, which causes deferral. An explicit connection reset |
489 | error has the same effect. Otherwise, put the host's identity in the message, | |
490 | leaving the errno value to be interpreted as well. In all cases, we have to | |
491 | assume the connection is now dead. */ | |
0756eb3c | 492 | |
19b9dc85 | 493 | if (*errno_value == 0 || *errno_value == ECONNRESET) |
0756eb3c PH |
494 | { |
495 | *errno_value = ERRNO_SMTPCLOSED; | |
496 | *message = US string_sprintf("Remote host %s [%s] closed connection " | |
497 | "in response to %s%s", host->name, host->address, pl, smtp_command); | |
498 | } | |
499 | else *message = US string_sprintf("%s [%s]", host->name, host->address); | |
500 | ||
501 | return FALSE; | |
502 | } | |
503 | ||
504 | ||
505 | ||
506 | /************************************************* | |
507 | * Write error message to logs * | |
508 | *************************************************/ | |
509 | ||
510 | /* This writes to the main log and to the message log. | |
511 | ||
512 | Arguments: | |
513 | addr the address item containing error information | |
514 | host the current host | |
515 | ||
516 | Returns: nothing | |
517 | */ | |
518 | ||
519 | static void | |
520 | write_logs(address_item *addr, host_item *host) | |
521 | { | |
522 | if (addr->message != NULL) | |
523 | { | |
524 | uschar *message = addr->message; | |
525 | if (addr->basic_errno > 0) | |
526 | message = string_sprintf("%s: %s", message, strerror(addr->basic_errno)); | |
527 | log_write(0, LOG_MAIN, "%s", message); | |
528 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); | |
529 | } | |
530 | else | |
531 | { | |
7cd1141b PH |
532 | uschar *msg = |
533 | ((log_extra_selector & LX_outgoing_port) != 0)? | |
534 | string_sprintf("%s [%s]:%d", host->name, host->address, | |
535 | (host->port == PORT_NONE)? 25 : host->port) | |
536 | : | |
537 | string_sprintf("%s [%s]", host->name, host->address); | |
538 | log_write(0, LOG_MAIN, "%s %s", msg, strerror(addr->basic_errno)); | |
539 | deliver_msglog("%s %s %s\n", tod_stamp(tod_log), msg, | |
0756eb3c PH |
540 | strerror(addr->basic_errno)); |
541 | } | |
542 | } | |
543 | ||
544 | ||
545 | ||
546 | /************************************************* | |
547 | * Synchronize SMTP responses * | |
548 | *************************************************/ | |
549 | ||
550 | /* This function is called from smtp_deliver() to receive SMTP responses from | |
551 | the server, and match them up with the commands to which they relate. When | |
552 | PIPELINING is not in use, this function is called after every command, and is | |
553 | therefore somewhat over-engineered, but it is simpler to use a single scheme | |
554 | that works both with and without PIPELINING instead of having two separate sets | |
555 | of code. | |
556 | ||
557 | The set of commands that are buffered up with pipelining may start with MAIL | |
558 | and may end with DATA; in between are RCPT commands that correspond to the | |
559 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, | |
560 | etc.) are never buffered. | |
561 | ||
562 | Errors after MAIL or DATA abort the whole process leaving the response in the | |
563 | buffer. After MAIL, pending responses are flushed, and the original command is | |
564 | re-instated in big_buffer for error messages. For RCPT commands, the remote is | |
565 | permitted to reject some recipient addresses while accepting others. However | |
566 | certain errors clearly abort the whole process. Set the value in | |
567 | transport_return to PENDING_OK if the address is accepted. If there is a | |
568 | subsequent general error, it will get reset accordingly. If not, it will get | |
569 | converted to OK at the end. | |
570 | ||
571 | Arguments: | |
48c7f9e2 PH |
572 | addrlist the complete address list |
573 | include_affixes TRUE if affixes include in RCPT | |
574 | sync_addr ptr to the ptr of the one to start scanning at (updated) | |
575 | host the host we are connected to | |
576 | count the number of responses to read | |
577 | address_retry_ | |
578 | include_sender true if 4xx retry is to include the sender it its key | |
579 | pending_MAIL true if the first response is for MAIL | |
580 | pending_DATA 0 if last command sent was not DATA | |
581 | +1 if previously had a good recipient | |
582 | -1 if not previously had a good recipient | |
583 | inblock incoming SMTP block | |
584 | timeout timeout value | |
585 | buffer buffer for reading response | |
586 | buffsize size of buffer | |
0756eb3c PH |
587 | |
588 | Returns: 3 if at least one address had 2xx and one had 5xx | |
589 | 2 if at least one address had 5xx but none had 2xx | |
590 | 1 if at least one host had a 2xx response, but none had 5xx | |
591 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) | |
592 | -1 timeout while reading RCPT response | |
593 | -2 I/O or other non-response error for RCPT | |
594 | -3 DATA or MAIL failed - errno and buffer set | |
595 | */ | |
596 | ||
597 | static int | |
598 | sync_responses(address_item *addrlist, BOOL include_affixes, | |
48c7f9e2 PH |
599 | address_item **sync_addr, host_item *host, int count, |
600 | BOOL address_retry_include_sender, BOOL pending_MAIL, | |
0756eb3c PH |
601 | int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer, |
602 | int buffsize) | |
603 | { | |
604 | address_item *addr = *sync_addr; | |
605 | int yield = 0; | |
606 | ||
607 | /* Handle the response for a MAIL command. On error, reinstate the original | |
608 | command in big_buffer for error message use, and flush any further pending | |
609 | responses before returning, except after I/O errors and timeouts. */ | |
610 | ||
611 | if (pending_MAIL) | |
612 | { | |
613 | count--; | |
614 | if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
615 | { | |
616 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ | |
617 | if (errno == 0 && buffer[0] != 0) | |
618 | { | |
619 | uschar flushbuffer[4096]; | |
e97957bc PH |
620 | int save_errno = 0; |
621 | if (buffer[0] == '4') | |
622 | { | |
623 | save_errno = ERRNO_MAIL4XX; | |
624 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
625 | } | |
0756eb3c PH |
626 | while (count-- > 0) |
627 | { | |
628 | if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer), | |
629 | '2', timeout) | |
630 | && (errno != 0 || flushbuffer[0] == 0)) | |
631 | break; | |
632 | } | |
e97957bc | 633 | errno = save_errno; |
0756eb3c PH |
634 | } |
635 | return -3; | |
636 | } | |
637 | } | |
638 | ||
639 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
640 | ||
641 | /* Read and handle the required number of RCPT responses, matching each one up | |
642 | with an address by scanning for the next address whose status is PENDING_DEFER. | |
643 | */ | |
644 | ||
645 | while (count-- > 0) | |
646 | { | |
647 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; | |
648 | ||
649 | /* The address was accepted */ | |
650 | ||
651 | if (smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
652 | { | |
653 | yield |= 1; | |
654 | addr->transport_return = PENDING_OK; | |
655 | ||
656 | /* If af_dr_retry_exists is set, there was a routing delay on this address; | |
657 | ensure that any address-specific retry record is expunged. */ | |
658 | ||
659 | if (testflag(addr, af_dr_retry_exists)) | |
660 | retry_add_item(addr, addr->address_retry_key, rf_delete); | |
661 | } | |
662 | ||
663 | /* Timeout while reading the response */ | |
664 | ||
665 | else if (errno == ETIMEDOUT) | |
666 | { | |
667 | int save_errno = errno; | |
668 | uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] " | |
669 | "after RCPT TO:<%s>", host->name, host->address, | |
670 | transport_rcpt_address(addr, include_affixes)); | |
447d236c | 671 | set_errno(addrlist, save_errno, message, DEFER, FALSE); |
0756eb3c | 672 | retry_add_item(addr, addr->address_retry_key, 0); |
f6c332bd | 673 | update_waiting = FALSE; |
0756eb3c PH |
674 | return -1; |
675 | } | |
676 | ||
677 | /* Handle other errors in obtaining an SMTP response by returning -1. This | |
678 | will cause all the addresses to be deferred. Restore the SMTP command in | |
679 | big_buffer for which we are checking the response, so the error message | |
680 | makes sense. */ | |
681 | ||
682 | else if (errno != 0 || buffer[0] == 0) | |
683 | { | |
684 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", | |
685 | transport_rcpt_address(addr, include_affixes)); | |
686 | return -2; | |
687 | } | |
688 | ||
689 | /* Handle SMTP permanent and temporary response codes. */ | |
690 | ||
691 | else | |
692 | { | |
693 | addr->message = | |
447d236c | 694 | string_sprintf("SMTP error from remote mail server after RCPT TO:<%s>: " |
0756eb3c PH |
695 | "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes), |
696 | host->name, host->address, string_printing(buffer)); | |
447d236c | 697 | setflag(addr, af_pass_message); |
0756eb3c PH |
698 | deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message); |
699 | ||
700 | /* The response was 5xx */ | |
701 | ||
702 | if (buffer[0] == '5') | |
703 | { | |
704 | addr->transport_return = FAIL; | |
705 | yield |= 2; | |
706 | } | |
707 | ||
708 | /* The response was 4xx */ | |
709 | ||
710 | else | |
711 | { | |
0756eb3c PH |
712 | addr->transport_return = DEFER; |
713 | addr->basic_errno = ERRNO_RCPT4XX; | |
e97957bc | 714 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; |
0756eb3c PH |
715 | |
716 | /* Log temporary errors if there are more hosts to be tried. */ | |
717 | ||
718 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message); | |
719 | ||
f6c332bd PH |
720 | /* Do not put this message on the list of those waiting for specific |
721 | hosts, as otherwise it is likely to be tried too often. */ | |
0756eb3c | 722 | |
f6c332bd | 723 | update_waiting = FALSE; |
0756eb3c | 724 | |
48c7f9e2 PH |
725 | /* Add a retry item for the address so that it doesn't get tried again |
726 | too soon. If address_retry_include_sender is true, add the sender address | |
727 | to the retry key. */ | |
0756eb3c | 728 | |
48c7f9e2 PH |
729 | if (address_retry_include_sender) |
730 | { | |
731 | uschar *altkey = string_sprintf("%s:<%s>", addr->address_retry_key, | |
732 | sender_address); | |
733 | retry_add_item(addr, altkey, 0); | |
734 | } | |
735 | else retry_add_item(addr, addr->address_retry_key, 0); | |
0756eb3c PH |
736 | } |
737 | } | |
738 | } /* Loop for next RCPT response */ | |
739 | ||
740 | /* Update where to start at for the next block of responses, unless we | |
741 | have already handled all the addresses. */ | |
742 | ||
743 | if (addr != NULL) *sync_addr = addr->next; | |
744 | ||
745 | /* Handle a response to DATA. If we have not had any good recipients, either | |
746 | previously or in this block, the response is ignored. */ | |
747 | ||
748 | if (pending_DATA != 0 && | |
749 | !smtp_read_response(inblock, buffer, buffsize, '3', timeout)) | |
750 | { | |
751 | int code; | |
752 | uschar *msg; | |
447d236c | 753 | BOOL pass_message; |
e97957bc PH |
754 | if (pending_DATA > 0 || (yield & 1) != 0) |
755 | { | |
756 | if (errno == 0 && buffer[0] == '4') | |
757 | { | |
758 | errno = ERRNO_DATA4XX; | |
759 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
760 | } | |
761 | return -3; | |
762 | } | |
447d236c | 763 | (void)check_response(host, &errno, 0, buffer, &code, &msg, &pass_message); |
0756eb3c PH |
764 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " |
765 | "is in use and there were no good recipients\n", msg); | |
766 | } | |
767 | ||
768 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if | |
769 | present) received 3xx. If any RCPTs were handled and yielded anything other | |
770 | than 4xx, yield will be set non-zero. */ | |
771 | ||
772 | return yield; | |
773 | } | |
774 | ||
775 | ||
776 | ||
777 | /************************************************* | |
778 | * Deliver address list to given host * | |
779 | *************************************************/ | |
780 | ||
781 | /* If continue_hostname is not null, we get here only when continuing to | |
782 | deliver down an existing channel. The channel was passed as the standard | |
783 | input. | |
784 | ||
785 | Otherwise, we have to make a connection to the remote host, and do the | |
786 | initial protocol exchange. | |
787 | ||
788 | When running as an MUA wrapper, if the sender or any recipient is rejected, | |
789 | temporarily or permanently, we force failure for all recipients. | |
790 | ||
791 | Arguments: | |
792 | addrlist chain of potential addresses to deliver; only those whose | |
793 | transport_return field is set to PENDING_DEFER are currently | |
794 | being processed; others should be skipped - they have either | |
795 | been delivered to an earlier host or IP address, or been | |
796 | failed by one of them. | |
797 | host host to deliver to | |
798 | host_af AF_INET or AF_INET6 | |
2d280592 | 799 | port default TCP/IP port to use, in host byte order |
0756eb3c PH |
800 | interface interface to bind to, or NULL |
801 | tblock transport instance block | |
802 | copy_host TRUE if host set in addr->host_used must be copied, because | |
803 | it is specific to this call of the transport | |
804 | message_defer set TRUE if yield is OK, but all addresses were deferred | |
805 | because of a non-recipient, non-host failure, that is, a | |
806 | 4xx response to MAIL FROM, DATA, or ".". This is a defer | |
807 | that is specific to the message. | |
808 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for | |
809 | a second attempt after TLS initialization fails | |
810 | ||
811 | Returns: OK - the connection was made and the delivery attempted; | |
812 | the result for each address is in its data block. | |
813 | DEFER - the connection could not be made, or something failed | |
814 | while setting up the SMTP session, or there was a | |
815 | non-message-specific error, such as a timeout. | |
816 | ERROR - a filter command is specified for this transport, | |
817 | and there was a problem setting it up; OR helo_data | |
818 | or add_headers or authenticated_sender is specified | |
819 | for this transport, and the string failed to expand | |
820 | */ | |
821 | ||
822 | static int | |
823 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port, | |
824 | uschar *interface, transport_instance *tblock, BOOL copy_host, | |
825 | BOOL *message_defer, BOOL suppress_tls) | |
826 | { | |
827 | address_item *addr; | |
828 | address_item *sync_addr; | |
829 | address_item *first_addr = addrlist; | |
830 | int yield = OK; | |
831 | int address_count; | |
832 | int save_errno; | |
833 | int rc; | |
834 | time_t start_delivery_time = time(NULL); | |
835 | smtp_transport_options_block *ob = | |
836 | (smtp_transport_options_block *)(tblock->options_block); | |
837 | BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0; | |
838 | BOOL ok = FALSE; | |
839 | BOOL send_rset = TRUE; | |
840 | BOOL send_quit = TRUE; | |
841 | BOOL setting_up = TRUE; | |
842 | BOOL completed_address = FALSE; | |
843 | BOOL esmtp = TRUE; | |
844 | BOOL pending_MAIL; | |
447d236c | 845 | BOOL pass_message = FALSE; |
0756eb3c PH |
846 | smtp_inblock inblock; |
847 | smtp_outblock outblock; | |
848 | int max_rcpt = tblock->max_addresses; | |
f1513293 | 849 | uschar *igquotstr = US""; |
0756eb3c PH |
850 | uschar *local_authenticated_sender = authenticated_sender; |
851 | uschar *helo_data; | |
852 | uschar *message = NULL; | |
853 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; | |
854 | uschar *p; | |
855 | uschar buffer[4096]; | |
856 | uschar inbuffer[4096]; | |
857 | uschar outbuffer[1024]; | |
858 | ||
859 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ | |
860 | ||
861 | *message_defer = FALSE; | |
862 | smtp_command = US"initial connection"; | |
863 | if (max_rcpt == 0) max_rcpt = 999999; | |
864 | ||
865 | /* Set up the buffer for reading SMTP response packets. */ | |
866 | ||
867 | inblock.buffer = inbuffer; | |
868 | inblock.buffersize = sizeof(inbuffer); | |
869 | inblock.ptr = inbuffer; | |
870 | inblock.ptrend = inbuffer; | |
871 | ||
872 | /* Set up the buffer for holding SMTP commands while pipelining */ | |
873 | ||
874 | outblock.buffer = outbuffer; | |
875 | outblock.buffersize = sizeof(outbuffer); | |
876 | outblock.ptr = outbuffer; | |
877 | outblock.cmd_count = 0; | |
878 | outblock.authenticating = FALSE; | |
879 | ||
880 | /* Expand the greeting message */ | |
881 | ||
882 | helo_data = expand_string(ob->helo_data); | |
883 | if (helo_data == NULL) | |
884 | { | |
885 | uschar *message = string_sprintf("failed to expand helo_data: %s", | |
886 | expand_string_message); | |
447d236c | 887 | set_errno(addrlist, 0, message, DEFER, FALSE); |
0756eb3c PH |
888 | return ERROR; |
889 | } | |
890 | ||
891 | /* If an authenticated_sender override has been specified for this transport | |
892 | instance, expand it. If the expansion is forced to fail, and there was already | |
893 | an authenticated_sender for this message, the original value will be used. | |
894 | Other expansion failures are serious. An empty result is ignored, but there is | |
895 | otherwise no check - this feature is expected to be used with LMTP and other | |
896 | cases where non-standard addresses (e.g. without domains) might be required. */ | |
897 | ||
898 | if (ob->authenticated_sender != NULL) | |
899 | { | |
900 | uschar *new = expand_string(ob->authenticated_sender); | |
901 | if (new == NULL) | |
902 | { | |
903 | if (!expand_string_forcedfail) | |
904 | { | |
905 | uschar *message = string_sprintf("failed to expand " | |
906 | "authenticated_sender: %s", expand_string_message); | |
447d236c | 907 | set_errno(addrlist, 0, message, DEFER, FALSE); |
0756eb3c PH |
908 | return ERROR; |
909 | } | |
910 | } | |
911 | else if (new[0] != 0) local_authenticated_sender = new; | |
912 | } | |
913 | ||
914 | /* Make a connection to the host if this isn't a continued delivery, and handle | |
915 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled | |
916 | specially so they can be identified for retries. */ | |
917 | ||
918 | if (continue_hostname == NULL) | |
919 | { | |
920 | inblock.sock = outblock.sock = | |
921 | smtp_connect(host, host_af, port, interface, ob->connect_timeout, | |
922 | ob->keepalive); | |
923 | if (inblock.sock < 0) | |
924 | { | |
925 | set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno, | |
447d236c | 926 | NULL, DEFER, FALSE); |
0756eb3c PH |
927 | return DEFER; |
928 | } | |
929 | ||
930 | /* The first thing is to wait for an initial OK response. The dreaded "goto" | |
931 | is nevertheless a reasonably clean way of programming this kind of logic, | |
932 | where you want to escape on any error. */ | |
933 | ||
934 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
935 | ob->command_timeout)) goto RESPONSE_FAILED; | |
936 | ||
937 | /** Debugging without sending a message | |
938 | addrlist->transport_return = DEFER; | |
939 | goto SEND_QUIT; | |
940 | **/ | |
941 | ||
942 | /* Errors that occur after this point follow an SMTP command, which is | |
943 | left in big_buffer by smtp_write_command() for use in error messages. */ | |
944 | ||
945 | smtp_command = big_buffer; | |
946 | ||
947 | /* Tell the remote who we are... | |
948 | ||
949 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the | |
950 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the | |
951 | greeting is of this form. The assumption was that the far end supports it | |
952 | properly... but experience shows that there are some that give 5xx responses, | |
953 | even though the banner includes "ESMTP" (there's a bloody-minded one that | |
954 | says "ESMTP not spoken here"). Cope with that case. | |
955 | ||
956 | September 2000: Time has passed, and it seems reasonable now to always send | |
957 | EHLO at the start. It is also convenient to make the change while installing | |
958 | the TLS stuff. | |
959 | ||
960 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" | |
961 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There | |
962 | would be no way to send out the mails, so there is now a host list | |
963 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the | |
964 | PIPELINING problem as well. Maybe it can also be useful to cure other | |
965 | problems with broken servers. | |
966 | ||
967 | Exim originally sent "Helo" at this point and ran for nearly a year that way. | |
968 | Then somebody tried it with a Microsoft mailer... It seems that all other | |
969 | mailers use upper case for some reason (the RFC is quite clear about case | |
970 | independence) so, for peace of mind, I gave in. */ | |
971 | ||
972 | esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL, | |
973 | host->name, host->address, NULL) != OK; | |
974 | ||
975 | if (esmtp) | |
976 | { | |
977 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", | |
978 | lmtp? "LHLO" : "EHLO", helo_data) < 0) | |
979 | goto SEND_FAILED; | |
980 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
981 | ob->command_timeout)) | |
982 | { | |
983 | if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED; | |
984 | esmtp = FALSE; | |
985 | } | |
986 | } | |
987 | else | |
988 | { | |
989 | DEBUG(D_transport) | |
990 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
991 | } | |
992 | ||
993 | if (!esmtp) | |
994 | { | |
995 | if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0) | |
996 | goto SEND_FAILED; | |
997 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
998 | ob->command_timeout)) goto RESPONSE_FAILED; | |
999 | } | |
1000 | ||
f1513293 PH |
1001 | /* Set IGNOREQUOTA if the response to LHLO specifies support and the |
1002 | lmtp_ignore_quota option was set. */ | |
1003 | ||
1004 | igquotstr = (lmtp && ob->lmtp_ignore_quota && | |
1005 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1006 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; | |
1007 | ||
0756eb3c PH |
1008 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ |
1009 | ||
1010 | #ifdef SUPPORT_TLS | |
1011 | tls_offered = esmtp && | |
1012 | pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0, | |
1013 | PCRE_EOPT, NULL, 0) >= 0; | |
1014 | #endif | |
1015 | } | |
1016 | ||
1017 | /* For continuing deliveries down the same channel, the socket is the standard | |
1018 | input, and we don't need to redo EHLO here (but may need to do so for TLS - see | |
1019 | below). Set up the pointer to where subsequent commands will be left, for | |
1020 | error messages. Note that smtp_use_size and smtp_use_pipelining will have been | |
1021 | set from the command line if they were set in the process that passed the | |
1022 | connection on. */ | |
1023 | ||
1024 | else | |
1025 | { | |
1026 | inblock.sock = outblock.sock = fileno(stdin); | |
1027 | smtp_command = big_buffer; | |
1028 | } | |
1029 | ||
1030 | /* If TLS is available on this connection, whether continued or not, attempt to | |
1031 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, | |
1032 | send another EHLO - the server may give a different answer in secure mode. We | |
1033 | use a separate buffer for reading the response to STARTTLS so that if it is | |
1034 | negative, the original EHLO data is available for subsequent analysis, should | |
1035 | the client not be required to use TLS. If the response is bad, copy the buffer | |
1036 | for error analysis. */ | |
1037 | ||
1038 | #ifdef SUPPORT_TLS | |
1039 | if (tls_offered && !suppress_tls && | |
1040 | verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name, | |
1041 | host->address, NULL) != OK) | |
1042 | { | |
1043 | uschar buffer2[4096]; | |
1044 | if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0) | |
1045 | goto SEND_FAILED; | |
1046 | ||
1047 | /* If there is an I/O error, transmission of this message is deferred. If | |
1048 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is | |
1049 | false, we also defer. However, if there is a temporary rejection of STARTTLS | |
1050 | and tls_tempfail_tryclear is true, or if there is an outright rejection of | |
1051 | STARTTLS, we carry on. This means we will try to send the message in clear, | |
1052 | unless the host is in hosts_require_tls (tested below). */ | |
1053 | ||
1054 | if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2', | |
1055 | ob->command_timeout)) | |
1056 | { | |
1057 | Ustrncpy(buffer, buffer2, sizeof(buffer)); | |
1058 | if (errno != 0 || buffer2[0] == 0 || | |
1059 | (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)) | |
1060 | goto RESPONSE_FAILED; | |
1061 | } | |
1062 | ||
1063 | /* STARTTLS accepted: try to negotiate a TLS session. */ | |
1064 | ||
1065 | else | |
1066 | { | |
83da1223 PH |
1067 | int rc = tls_client_start(inblock.sock, |
1068 | host, | |
1069 | addrlist, | |
0756eb3c PH |
1070 | NULL, /* No DH param */ |
1071 | ob->tls_certificate, | |
1072 | ob->tls_privatekey, | |
1073 | ob->tls_verify_certificates, | |
1074 | ob->tls_crl, | |
1075 | ob->tls_require_ciphers, | |
83da1223 PH |
1076 | ob->gnutls_require_mac, |
1077 | ob->gnutls_require_kx, | |
1078 | ob->gnutls_require_proto, | |
0756eb3c PH |
1079 | ob->command_timeout); |
1080 | ||
1081 | /* TLS negotiation failed; give an error. From outside, this function may | |
1082 | be called again to try in clear on a new connection, if the options permit | |
1083 | it for this host. */ | |
1084 | ||
1085 | if (rc != OK) | |
1086 | { | |
1087 | save_errno = ERRNO_TLSFAILURE; | |
1088 | message = US"failure while setting up TLS session"; | |
1089 | send_quit = FALSE; | |
1090 | goto TLS_FAILED; | |
1091 | } | |
1092 | ||
1093 | /* TLS session is set up */ | |
1094 | ||
1095 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
1096 | { | |
5ca2a9a1 PH |
1097 | if (addr->transport_return == PENDING_DEFER) |
1098 | { | |
1099 | addr->cipher = tls_cipher; | |
1100 | addr->peerdn = tls_peerdn; | |
1101 | } | |
0756eb3c PH |
1102 | } |
1103 | } | |
1104 | } | |
1105 | ||
1106 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. */ | |
1107 | ||
1108 | if (tls_active >= 0) | |
1109 | { | |
1110 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", lmtp? "LHLO" : "EHLO", | |
1111 | helo_data) < 0) | |
1112 | goto SEND_FAILED; | |
1113 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1114 | ob->command_timeout)) | |
1115 | goto RESPONSE_FAILED; | |
1116 | } | |
1117 | ||
1118 | /* If the host is required to use a secure channel, ensure that we | |
1119 | have one. */ | |
1120 | ||
1121 | else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, | |
1122 | host->address, NULL) == OK) | |
1123 | { | |
1124 | save_errno = ERRNO_TLSREQUIRED; | |
1125 | message = string_sprintf("a TLS session is required for %s [%s], but %s", | |
1126 | host->name, host->address, | |
1127 | tls_offered? "an attempt to start TLS failed" : | |
1128 | "the server did not offer TLS support"); | |
1129 | goto TLS_FAILED; | |
1130 | } | |
1131 | #endif | |
1132 | ||
1133 | /* If TLS is active, we have just started it up and re-done the EHLO command, | |
1134 | so its response needs to be analyzed. If TLS is not active and this is a | |
1135 | continued session down a previously-used socket, we haven't just done EHLO, so | |
1136 | we skip this. */ | |
1137 | ||
1138 | if (continue_hostname == NULL | |
1139 | #ifdef SUPPORT_TLS | |
1140 | || tls_active >= 0 | |
1141 | #endif | |
1142 | ) | |
1143 | { | |
1144 | int require_auth; | |
1145 | uschar *fail_reason = US"server did not advertise AUTH support"; | |
1146 | ||
f1513293 PH |
1147 | /* Set for IGNOREQUOTA if the response to LHLO specifies support and the |
1148 | lmtp_ignore_quota option was set. */ | |
1149 | ||
1150 | igquotstr = (lmtp && ob->lmtp_ignore_quota && | |
1151 | pcre_exec(regex_IGNOREQUOTA, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1152 | PCRE_EOPT, NULL, 0) >= 0)? US" IGNOREQUOTA" : US""; | |
1153 | ||
0756eb3c PH |
1154 | /* If the response to EHLO specified support for the SIZE parameter, note |
1155 | this, provided size_addition is non-negative. */ | |
1156 | ||
1157 | smtp_use_size = esmtp && ob->size_addition >= 0 && | |
1158 | pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1159 | PCRE_EOPT, NULL, 0) >= 0; | |
1160 | ||
1161 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched | |
1162 | the current host, esmtp will be false, so PIPELINING can never be used. */ | |
1163 | ||
1164 | smtp_use_pipelining = esmtp && | |
1165 | pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1166 | PCRE_EOPT, NULL, 0) >= 0; | |
1167 | ||
1168 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", | |
1169 | smtp_use_pipelining? "" : "not "); | |
1170 | ||
1171 | /* Note if the response to EHLO specifies support for the AUTH extension. | |
1172 | If it has, check that this host is one we want to authenticate to, and do | |
1173 | the business. The host name and address must be available when the | |
1174 | authenticator's client driver is running. */ | |
1175 | ||
1176 | smtp_authenticated = FALSE; | |
1177 | require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL, | |
1178 | host->name, host->address, NULL); | |
1179 | ||
1180 | if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1)) | |
1181 | { | |
1182 | uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]); | |
1183 | expand_nmax = -1; /* reset */ | |
1184 | ||
1185 | /* Must not do this check until after we have saved the result of the | |
1186 | regex match above. */ | |
1187 | ||
1188 | if (require_auth == OK || | |
1189 | verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name, | |
1190 | host->address, NULL) == OK) | |
1191 | { | |
1192 | auth_instance *au; | |
1193 | fail_reason = US"no common mechanisms were found"; | |
1194 | ||
1195 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); | |
1196 | ||
1197 | /* Scan the configured authenticators looking for one which is configured | |
1198 | for use as a client and whose name matches an authentication mechanism | |
1199 | supported by the server. If one is found, attempt to authenticate by | |
1200 | calling its client function. */ | |
1201 | ||
1202 | for (au = auths; !smtp_authenticated && au != NULL; au = au->next) | |
1203 | { | |
1204 | uschar *p = names; | |
1205 | if (!au->client) continue; | |
1206 | ||
1207 | /* Loop to scan supported server mechanisms */ | |
1208 | ||
1209 | while (*p != 0) | |
1210 | { | |
1211 | int rc; | |
1212 | int len = Ustrlen(au->public_name); | |
1213 | while (isspace(*p)) p++; | |
1214 | ||
1215 | if (strncmpic(au->public_name, p, len) != 0 || | |
1216 | (p[len] != 0 && !isspace(p[len]))) | |
1217 | { | |
1218 | while (*p != 0 && !isspace(*p)) p++; | |
1219 | continue; | |
1220 | } | |
1221 | ||
1222 | /* Found data for a listed mechanism. Call its client entry. Set | |
1223 | a flag in the outblock so that data is overwritten after sending so | |
1224 | that reflections don't show it. */ | |
1225 | ||
1226 | fail_reason = US"authentication attempt(s) failed"; | |
1227 | outblock.authenticating = TRUE; | |
1228 | rc = (au->info->clientcode)(au, &inblock, &outblock, | |
1229 | ob->command_timeout, buffer, sizeof(buffer)); | |
1230 | outblock.authenticating = FALSE; | |
1231 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", | |
1232 | au->name, rc); | |
1233 | ||
1234 | /* A temporary authentication failure must hold up delivery to | |
1235 | this host. After a permanent authentication failure, we carry on | |
1236 | to try other authentication methods. If all fail hard, try to | |
1237 | deliver the message unauthenticated unless require_auth was set. */ | |
1238 | ||
1239 | switch(rc) | |
1240 | { | |
1241 | case OK: | |
1242 | smtp_authenticated = TRUE; /* stops the outer loop */ | |
1243 | break; | |
1244 | ||
1245 | /* Failure after writing a command */ | |
1246 | ||
1247 | case FAIL_SEND: | |
1248 | goto SEND_FAILED; | |
1249 | ||
1250 | /* Failure after reading a response */ | |
1251 | ||
1252 | case FAIL: | |
1253 | if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED; | |
1254 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", | |
1255 | au->name, host->name, host->address, buffer); | |
1256 | break; | |
1257 | ||
1258 | /* Failure by some other means. In effect, the authenticator | |
1259 | decided it wasn't prepared to handle this case. Typically this | |
1260 | is the result of "fail" in an expansion string. Do we need to | |
4730f942 PH |
1261 | log anything here? Feb 2006: a message is now put in the buffer |
1262 | if logging is required. */ | |
0756eb3c PH |
1263 | |
1264 | case CANCELLED: | |
4730f942 PH |
1265 | if (*buffer != 0) |
1266 | log_write(0, LOG_MAIN, "%s authenticator cancelled " | |
1267 | "authentication H=%s [%s] %s", au->name, host->name, | |
1268 | host->address, buffer); | |
0756eb3c PH |
1269 | break; |
1270 | ||
1271 | /* Internal problem, message in buffer. */ | |
1272 | ||
1273 | case ERROR: | |
1274 | yield = ERROR; | |
447d236c | 1275 | set_errno(addrlist, 0, string_copy(buffer), DEFER, FALSE); |
0756eb3c PH |
1276 | goto SEND_QUIT; |
1277 | } | |
1278 | ||
1279 | break; /* If not authenticated, try next authenticator */ | |
1280 | } /* Loop for scanning supported server mechanisms */ | |
1281 | } /* Loop for further authenticators */ | |
1282 | } | |
1283 | } | |
1284 | ||
1285 | /* If we haven't authenticated, but are required to, give up. */ | |
1286 | ||
1287 | if (require_auth == OK && !smtp_authenticated) | |
1288 | { | |
1289 | yield = DEFER; | |
1290 | set_errno(addrlist, ERRNO_AUTHFAIL, | |
447d236c PH |
1291 | string_sprintf("authentication required but %s", fail_reason), DEFER, |
1292 | FALSE); | |
0756eb3c PH |
1293 | goto SEND_QUIT; |
1294 | } | |
1295 | } | |
1296 | ||
1297 | /* The setting up of the SMTP call is now complete. Any subsequent errors are | |
1298 | message-specific. */ | |
1299 | ||
1300 | setting_up = FALSE; | |
1301 | ||
1302 | /* If there is a filter command specified for this transport, we can now | |
1303 | set it up. This cannot be done until the identify of the host is known. */ | |
1304 | ||
1305 | if (tblock->filter_command != NULL) | |
1306 | { | |
1307 | BOOL rc; | |
1308 | uschar buffer[64]; | |
1309 | sprintf(CS buffer, "%.50s transport", tblock->name); | |
1310 | rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command, | |
1311 | TRUE, DEFER, addrlist, buffer, NULL); | |
1312 | ||
1313 | /* On failure, copy the error to all addresses, abandon the SMTP call, and | |
1314 | yield ERROR. */ | |
1315 | ||
1316 | if (!rc) | |
1317 | { | |
447d236c PH |
1318 | set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER, |
1319 | FALSE); | |
0756eb3c PH |
1320 | yield = ERROR; |
1321 | goto SEND_QUIT; | |
1322 | } | |
1323 | } | |
1324 | ||
1325 | ||
1326 | /* For messages that have more than the maximum number of envelope recipients, | |
1327 | we want to send several transactions down the same SMTP connection. (See | |
1328 | comments in deliver.c as to how this reconciles, heuristically, with | |
1329 | remote_max_parallel.) This optimization was added to Exim after the following | |
1330 | code was already working. The simplest way to put it in without disturbing the | |
1331 | code was to use a goto to jump back to this point when there is another | |
1332 | transaction to handle. */ | |
1333 | ||
1334 | SEND_MESSAGE: | |
1335 | sync_addr = first_addr; | |
1336 | address_count = 0; | |
1337 | ok = FALSE; | |
1338 | send_rset = TRUE; | |
1339 | completed_address = FALSE; | |
1340 | ||
1341 | ||
1342 | /* Initiate a message transfer. If we know the receiving MTA supports the SIZE | |
1343 | qualification, send it, adding something to the message size to allow for | |
1344 | imprecision and things that get added en route. Exim keeps the number of lines | |
1345 | in a message, so we can give an accurate value for the original message, but we | |
1346 | need some additional to handle added headers. (Double "." characters don't get | |
1347 | included in the count.) */ | |
1348 | ||
1349 | p = buffer; | |
1350 | *p = 0; | |
1351 | ||
1352 | if (smtp_use_size) | |
1353 | { | |
1354 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition); | |
1355 | while (*p) p++; | |
1356 | } | |
1357 | ||
1358 | /* Add the authenticated sender address if present */ | |
1359 | ||
382afc6b PH |
1360 | if ((smtp_authenticated || ob->authenticated_sender_force) && |
1361 | local_authenticated_sender != NULL) | |
0756eb3c PH |
1362 | { |
1363 | string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s", | |
1364 | auth_xtextencode(local_authenticated_sender, | |
1365 | Ustrlen(local_authenticated_sender))); | |
1366 | } | |
1367 | ||
1368 | /* From here until we send the DATA command, we can make use of PIPELINING | |
1369 | if the server host supports it. The code has to be able to check the responses | |
1370 | at any point, for when the buffer fills up, so we write it totally generally. | |
1371 | When PIPELINING is off, each command written reports that it has flushed the | |
1372 | buffer. */ | |
1373 | ||
1374 | pending_MAIL = TRUE; /* The block starts with MAIL */ | |
1375 | ||
1376 | rc = smtp_write_command(&outblock, smtp_use_pipelining, | |
1377 | "MAIL FROM:<%s>%s\r\n", return_path, buffer); | |
1378 | mail_command = string_copy(big_buffer); /* Save for later error message */ | |
1379 | ||
1380 | switch(rc) | |
1381 | { | |
1382 | case -1: /* Transmission error */ | |
1383 | goto SEND_FAILED; | |
1384 | ||
1385 | case +1: /* Block was sent */ | |
1386 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
e97957bc PH |
1387 | ob->command_timeout)) |
1388 | { | |
1389 | if (errno == 0 && buffer[0] == '4') | |
1390 | { | |
1391 | errno = ERRNO_MAIL4XX; | |
1392 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
1393 | } | |
1394 | goto RESPONSE_FAILED; | |
1395 | } | |
0756eb3c PH |
1396 | pending_MAIL = FALSE; |
1397 | break; | |
1398 | } | |
1399 | ||
1400 | /* Pass over all the relevant recipient addresses for this host, which are the | |
1401 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send | |
1402 | several before we have to read the responses for those seen so far. This | |
1403 | checking is done by a subroutine because it also needs to be done at the end. | |
1404 | Send only up to max_rcpt addresses at a time, leaving first_addr pointing to | |
1405 | the next one if not all are sent. | |
1406 | ||
1407 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the | |
1408 | last address because we want to abort if any recipients have any kind of | |
1409 | problem, temporary or permanent. We know that all recipient addresses will have | |
1410 | the PENDING_DEFER status, because only one attempt is ever made, and we know | |
1411 | that max_rcpt will be large, so all addresses will be done at once. */ | |
1412 | ||
1413 | for (addr = first_addr; | |
1414 | address_count < max_rcpt && addr != NULL; | |
1415 | addr = addr->next) | |
1416 | { | |
1417 | int count; | |
1418 | BOOL no_flush; | |
1419 | ||
1420 | if (addr->transport_return != PENDING_DEFER) continue; | |
1421 | ||
1422 | address_count++; | |
1423 | no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL); | |
1424 | ||
1425 | /* Now send the RCPT command, and process outstanding responses when | |
1426 | necessary. After a timeout on RCPT, we just end the function, leaving the | |
1427 | yield as OK, because this error can often mean that there is a problem with | |
1428 | just one address, so we don't want to delay the host. */ | |
1429 | ||
f1513293 PH |
1430 | count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>%s\r\n", |
1431 | transport_rcpt_address(addr, tblock->rcpt_include_affixes), igquotstr); | |
0756eb3c PH |
1432 | if (count < 0) goto SEND_FAILED; |
1433 | if (count > 0) | |
1434 | { | |
1435 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, | |
48c7f9e2 PH |
1436 | &sync_addr, host, count, ob->address_retry_include_sender, |
1437 | pending_MAIL, 0, &inblock, ob->command_timeout, buffer, | |
1438 | sizeof(buffer))) | |
0756eb3c PH |
1439 | { |
1440 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
1441 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
1442 | break; | |
1443 | ||
1444 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
1445 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
1446 | case 0: /* No 2xx or 5xx, but no probs */ | |
1447 | break; | |
1448 | ||
1449 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
1450 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */ | |
1451 | } | |
1452 | pending_MAIL = FALSE; /* Dealt with MAIL */ | |
1453 | } | |
1454 | } /* Loop for next address */ | |
1455 | ||
1456 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either | |
1457 | permanently or temporarily. We should have flushed and synced after the last | |
1458 | RCPT. */ | |
1459 | ||
1460 | if (mua_wrapper) | |
1461 | { | |
1462 | address_item *badaddr; | |
1463 | for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next) | |
1464 | { | |
1465 | if (badaddr->transport_return != PENDING_OK) break; | |
1466 | } | |
1467 | if (badaddr != NULL) | |
1468 | { | |
447d236c PH |
1469 | set_errno(addrlist, 0, badaddr->message, FAIL, |
1470 | testflag(badaddr, af_pass_message)); | |
0756eb3c PH |
1471 | ok = FALSE; |
1472 | } | |
1473 | } | |
1474 | ||
1475 | /* If ok is TRUE, we know we have got at least one good recipient, and must now | |
1476 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still | |
1477 | have a good recipient buffered up if we are pipelining. We don't want to waste | |
1478 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we | |
1479 | are pipelining. The responses are all handled by sync_responses(). */ | |
1480 | ||
1481 | if (ok || (smtp_use_pipelining && !mua_wrapper)) | |
1482 | { | |
1483 | int count = smtp_write_command(&outblock, FALSE, "DATA\r\n"); | |
1484 | if (count < 0) goto SEND_FAILED; | |
1485 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr, | |
48c7f9e2 PH |
1486 | host, count, ob->address_retry_include_sender, pending_MAIL, |
1487 | ok? +1 : -1, &inblock, ob->command_timeout, buffer, sizeof(buffer))) | |
0756eb3c PH |
1488 | { |
1489 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
1490 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
1491 | break; | |
1492 | ||
1493 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
1494 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
1495 | case 0: break; /* No 2xx or 5xx, but no probs */ | |
1496 | ||
1497 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
1498 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ | |
1499 | } | |
1500 | } | |
1501 | ||
1502 | /* Save the first address of the next batch. */ | |
1503 | ||
1504 | first_addr = addr; | |
1505 | ||
1506 | /* If there were no good recipients (but otherwise there have been no | |
1507 | problems), just set ok TRUE, since we have handled address-specific errors | |
1508 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism | |
1509 | for handling the SMTP dot-handling protocol, flagging to apply to headers as | |
1510 | well as body. Set the appropriate timeout value to be used for each chunk. | |
1511 | (Haven't been able to make it work using select() for writing yet.) */ | |
1512 | ||
1513 | if (!ok) ok = TRUE; else | |
1514 | { | |
1515 | sigalrm_seen = FALSE; | |
1516 | transport_write_timeout = ob->data_timeout; | |
1517 | smtp_command = US"sending data block"; /* For error messages */ | |
1518 | DEBUG(D_transport|D_v) | |
1519 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); | |
1520 | transport_count = 0; | |
fb2274d4 TK |
1521 | #ifdef EXPERIMENTAL_DOMAINKEYS |
1522 | if ( (ob->dk_private_key != NULL) && (ob->dk_selector != NULL) ) | |
1523 | ok = dk_transport_write_message(addrlist, inblock.sock, | |
1524 | topt_use_crlf | topt_end_dot | topt_escape_headers | | |
1525 | (tblock->body_only? topt_no_headers : 0) | | |
1526 | (tblock->headers_only? topt_no_body : 0) | | |
1527 | (tblock->return_path_add? topt_add_return_path : 0) | | |
1528 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
1529 | (tblock->envelope_to_add? topt_add_envelope_to : 0), | |
1530 | 0, /* No size limit */ | |
1531 | tblock->add_headers, tblock->remove_headers, | |
1532 | US".", US"..", /* Escaping strings */ | |
1533 | tblock->rewrite_rules, tblock->rewrite_existflags, | |
1534 | ob->dk_private_key, ob->dk_domain, ob->dk_selector, | |
1535 | ob->dk_canon, ob->dk_headers, ob->dk_strict); | |
1536 | else | |
1537 | #endif | |
0756eb3c PH |
1538 | ok = transport_write_message(addrlist, inblock.sock, |
1539 | topt_use_crlf | topt_end_dot | topt_escape_headers | | |
1540 | (tblock->body_only? topt_no_headers : 0) | | |
1541 | (tblock->headers_only? topt_no_body : 0) | | |
1542 | (tblock->return_path_add? topt_add_return_path : 0) | | |
1543 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
1544 | (tblock->envelope_to_add? topt_add_envelope_to : 0), | |
1545 | 0, /* No size limit */ | |
1546 | tblock->add_headers, tblock->remove_headers, | |
1547 | US".", US"..", /* Escaping strings */ | |
1548 | tblock->rewrite_rules, tblock->rewrite_existflags); | |
1549 | ||
1550 | /* transport_write_message() uses write() because it is called from other | |
1551 | places to write to non-sockets. This means that under some OS (e.g. Solaris) | |
1552 | it can exit with "Broken pipe" as its error. This really means that the | |
1553 | socket got closed at the far end. */ | |
1554 | ||
1555 | transport_write_timeout = 0; /* for subsequent transports */ | |
1556 | ||
1557 | /* Failure can either be some kind of I/O disaster (including timeout), | |
1558 | or the failure of a transport filter or the expansion of added headers. */ | |
1559 | ||
1560 | if (!ok) | |
1561 | { | |
1562 | buffer[0] = 0; /* There hasn't been a response */ | |
1563 | goto RESPONSE_FAILED; | |
1564 | } | |
1565 | ||
1566 | /* We used to send the terminating "." explicitly here, but because of | |
1567 | buffering effects at both ends of TCP/IP connections, you don't gain | |
1568 | anything by keeping it separate, so it might as well go in the final | |
1569 | data buffer for efficiency. This is now done by setting the topt_end_dot | |
1570 | flag above. */ | |
1571 | ||
1572 | smtp_command = US"end of data"; | |
1573 | ||
1574 | /* For SMTP, we now read a single response that applies to the whole message. | |
1575 | If it is OK, then all the addresses have been delivered. */ | |
1576 | ||
e97957bc PH |
1577 | if (!lmtp) |
1578 | { | |
1579 | ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1580 | ob->final_timeout); | |
1581 | if (!ok && errno == 0 && buffer[0] == '4') | |
1582 | { | |
1583 | errno = ERRNO_DATA4XX; | |
1584 | addrlist->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
1585 | } | |
1586 | } | |
0756eb3c PH |
1587 | |
1588 | /* For LMTP, we get back a response for every RCPT command that we sent; | |
1589 | some may be accepted and some rejected. For those that get a response, their | |
1590 | status is fixed; any that are accepted have been handed over, even if later | |
1591 | responses crash - at least, that's how I read RFC 2033. | |
1592 | ||
1593 | If all went well, mark the recipient addresses as completed, record which | |
1594 | host/IPaddress they were delivered to, and cut out RSET when sending another | |
1595 | message down the same channel. Write the completed addresses to the journal | |
1596 | now so that they are recorded in case there is a crash of hardware or | |
1597 | software before the spool gets updated. Also record the final SMTP | |
1598 | confirmation if needed (for SMTP only). */ | |
1599 | ||
1600 | if (ok) | |
1601 | { | |
1602 | int flag = '='; | |
1603 | int delivery_time = (int)(time(NULL) - start_delivery_time); | |
1604 | int len; | |
1605 | host_item *thost; | |
1606 | uschar *conf = NULL; | |
1607 | send_rset = FALSE; | |
1608 | ||
1609 | /* Make a copy of the host if it is local to this invocation | |
1610 | of the transport. */ | |
1611 | ||
1612 | if (copy_host) | |
1613 | { | |
1614 | thost = store_get(sizeof(host_item)); | |
1615 | *thost = *host; | |
1616 | thost->name = string_copy(host->name); | |
1617 | thost->address = string_copy(host->address); | |
1618 | } | |
1619 | else thost = host; | |
1620 | ||
1621 | /* Set up confirmation if needed - applies only to SMTP */ | |
1622 | ||
1623 | if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp) | |
1624 | { | |
1625 | uschar *s = string_printing(buffer); | |
1626 | conf = (s == buffer)? (uschar *)string_copy(s) : s; | |
1627 | } | |
1628 | ||
1629 | /* Process all transported addresses - for LMTP, read a status for | |
1630 | each one. */ | |
1631 | ||
1632 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
1633 | { | |
1634 | if (addr->transport_return != PENDING_OK) continue; | |
1635 | ||
1636 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the | |
1637 | remaining addresses. Otherwise, it's a return code for just the one | |
75def545 PH |
1638 | address. For temporary errors, add a retry item for the address so that |
1639 | it doesn't get tried again too soon. */ | |
0756eb3c PH |
1640 | |
1641 | if (lmtp) | |
1642 | { | |
1643 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1644 | ob->final_timeout)) | |
1645 | { | |
1646 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; | |
1647 | addr->message = string_sprintf("LMTP error after %s: %s", | |
1648 | big_buffer, string_printing(buffer)); | |
75def545 PH |
1649 | setflag(addr, af_pass_message); /* Allow message to go to user */ |
1650 | if (buffer[0] == '5') | |
1651 | addr->transport_return = FAIL; | |
1652 | else | |
1653 | { | |
e97957bc PH |
1654 | errno = ERRNO_DATA4XX; |
1655 | addr->more_errno |= ((buffer[1] - '0')*10 + buffer[2] - '0') << 8; | |
75def545 PH |
1656 | addr->transport_return = DEFER; |
1657 | retry_add_item(addr, addr->address_retry_key, 0); | |
1658 | } | |
0756eb3c PH |
1659 | continue; |
1660 | } | |
1661 | completed_address = TRUE; /* NOW we can set this flag */ | |
1662 | } | |
1663 | ||
1664 | /* SMTP, or success return from LMTP for this address. Pass back the | |
2d280592 | 1665 | actual host that was used. */ |
0756eb3c PH |
1666 | |
1667 | addr->transport_return = OK; | |
1668 | addr->more_errno = delivery_time; | |
0756eb3c PH |
1669 | addr->host_used = thost; |
1670 | addr->special_action = flag; | |
1671 | addr->message = conf; | |
1672 | flag = '-'; | |
1673 | ||
1674 | /* Update the journal. For homonymic addresses, use the base address plus | |
1675 | the transport name. See lots of comments in deliver.c about the reasons | |
1676 | for the complications when homonyms are involved. Just carry on after | |
1677 | write error, as it may prove possible to update the spool file later. */ | |
1678 | ||
1679 | if (testflag(addr, af_homonym)) | |
1680 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); | |
1681 | else | |
1682 | sprintf(CS buffer, "%.500s\n", addr->unique); | |
1683 | ||
1684 | DEBUG(D_deliver) debug_printf("journalling %s", buffer); | |
1685 | len = Ustrlen(CS buffer); | |
1686 | if (write(journal_fd, buffer, len) != len) | |
1687 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " | |
1688 | "%s: %s", buffer, strerror(errno)); | |
1689 | } | |
1690 | ||
1691 | /* Ensure the journal file is pushed out to disk. */ | |
1692 | ||
54fc8428 | 1693 | if (EXIMfsync(journal_fd) < 0) |
0756eb3c PH |
1694 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", |
1695 | strerror(errno)); | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | ||
1700 | /* Handle general (not specific to one address) failures here. The value of ok | |
1701 | is used to skip over this code on the falling through case. A timeout causes a | |
1702 | deferral. Other errors may defer or fail according to the response code, and | |
1703 | may set up a special errno value, e.g. after connection chopped, which is | |
1704 | assumed if errno == 0 and there is no text in the buffer. If control reaches | |
1705 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as | |
1706 | the problem is not related to this specific message. */ | |
1707 | ||
1708 | if (!ok) | |
1709 | { | |
1710 | int code; | |
1711 | ||
1712 | RESPONSE_FAILED: | |
1713 | save_errno = errno; | |
1714 | message = NULL; | |
1715 | send_quit = check_response(host, &save_errno, addrlist->more_errno, | |
447d236c | 1716 | buffer, &code, &message, &pass_message); |
0756eb3c PH |
1717 | goto FAILED; |
1718 | ||
1719 | SEND_FAILED: | |
1720 | save_errno = errno; | |
1721 | code = '4'; | |
1722 | message = US string_sprintf("send() to %s [%s] failed: %s", | |
1723 | host->name, host->address, strerror(save_errno)); | |
1724 | send_quit = FALSE; | |
1725 | goto FAILED; | |
1726 | ||
1727 | /* This label is jumped to directly when a TLS negotiation has failed, | |
1728 | or was not done for a host for which it is required. Values will be set | |
1729 | in message and save_errno, and setting_up will always be true. Treat as | |
1730 | a temporary error. */ | |
1731 | ||
1732 | #ifdef SUPPORT_TLS | |
1733 | TLS_FAILED: | |
1734 | code = '4'; | |
1735 | #endif | |
1736 | ||
1737 | /* If the failure happened while setting up the call, see if the failure was | |
1738 | a 5xx response (this will either be on connection, or following HELO - a 5xx | |
1739 | after EHLO causes it to try HELO). If so, fail all addresses, as this host is | |
1740 | never going to accept them. For other errors during setting up (timeouts or | |
1741 | whatever), defer all addresses, and yield DEFER, so that the host is not | |
1742 | tried again for a while. */ | |
1743 | ||
1744 | FAILED: | |
1745 | ok = FALSE; /* For when reached by GOTO */ | |
1746 | ||
1747 | if (setting_up) | |
1748 | { | |
1749 | if (code == '5') | |
1750 | { | |
447d236c | 1751 | set_errno(addrlist, save_errno, message, FAIL, pass_message); |
0756eb3c PH |
1752 | } |
1753 | else | |
1754 | { | |
447d236c | 1755 | set_errno(addrlist, save_errno, message, DEFER, pass_message); |
0756eb3c PH |
1756 | yield = DEFER; |
1757 | } | |
1758 | } | |
1759 | ||
e97957bc | 1760 | /* We want to handle timeouts after MAIL or "." and loss of connection after |
0756eb3c | 1761 | "." specially. They can indicate a problem with the sender address or with |
e97957bc PH |
1762 | the contents of the message rather than a real error on the connection. These |
1763 | cases are treated in the same way as a 4xx response. This next bit of code | |
1764 | does the classification. */ | |
0756eb3c | 1765 | |
e97957bc | 1766 | else |
0756eb3c | 1767 | { |
e97957bc | 1768 | BOOL message_error; |
0756eb3c | 1769 | |
e97957bc PH |
1770 | switch(save_errno) |
1771 | { | |
1772 | case 0: | |
1773 | case ERRNO_MAIL4XX: | |
1774 | case ERRNO_DATA4XX: | |
1775 | message_error = TRUE; | |
1776 | break; | |
0756eb3c | 1777 | |
e97957bc PH |
1778 | case ETIMEDOUT: |
1779 | message_error = Ustrncmp(smtp_command,"MAIL",4) == 0 || | |
1780 | Ustrncmp(smtp_command,"end ",4) == 0; | |
1781 | break; | |
1782 | ||
1783 | case ERRNO_SMTPCLOSED: | |
1784 | message_error = Ustrncmp(smtp_command,"end ",4) == 0; | |
1785 | break; | |
1786 | ||
1787 | default: | |
1788 | message_error = FALSE; | |
1789 | break; | |
1790 | } | |
0756eb3c | 1791 | |
e97957bc | 1792 | /* Handle the cases that are treated as message errors. These are: |
0756eb3c | 1793 | |
e97957bc PH |
1794 | (a) negative response or timeout after MAIL |
1795 | (b) negative response after DATA | |
1796 | (c) negative response or timeout or dropped connection after "." | |
0756eb3c | 1797 | |
e97957bc PH |
1798 | It won't be a negative response or timeout after RCPT, as that is dealt |
1799 | with separately above. The action in all cases is to set an appropriate | |
1800 | error code for all the addresses, but to leave yield set to OK because the | |
1801 | host itself has not failed. Of course, it might in practice have failed | |
1802 | when we've had a timeout, but if so, we'll discover that at the next | |
1803 | delivery attempt. For a temporary error, set the message_defer flag, and | |
1804 | write to the logs for information if this is not the last host. The error | |
1805 | for the last host will be logged as part of the address's log line. */ | |
1806 | ||
1807 | if (message_error) | |
0756eb3c | 1808 | { |
e97957bc PH |
1809 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ |
1810 | set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER, | |
1811 | pass_message); | |
1812 | ||
1813 | /* If there's an errno, the message contains just the identity of | |
1814 | the host. */ | |
1815 | ||
1816 | if (code != '5') /* Anything other than 5 is treated as temporary */ | |
1817 | { | |
1818 | if (save_errno > 0) | |
1819 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); | |
1820 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message); | |
1821 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); | |
1822 | *message_defer = TRUE; | |
1823 | } | |
1824 | } | |
1825 | ||
1826 | /* Otherwise, we have an I/O error or a timeout other than after MAIL or | |
1827 | ".", or some other transportation error. We defer all addresses and yield | |
1828 | DEFER, except for the case of failed add_headers expansion, or a transport | |
1829 | filter failure, when the yield should be ERROR, to stop it trying other | |
1830 | hosts. */ | |
1831 | ||
1832 | else | |
1833 | { | |
1834 | yield = (save_errno == ERRNO_CHHEADER_FAIL || | |
1835 | save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER; | |
1836 | set_errno(addrlist, save_errno, message, DEFER, pass_message); | |
0756eb3c PH |
1837 | } |
1838 | } | |
1839 | } | |
1840 | ||
1841 | ||
1842 | /* If all has gone well, send_quit will be set TRUE, implying we can end the | |
1843 | SMTP session tidily. However, if there were too many addresses to send in one | |
1844 | message (indicated by first_addr being non-NULL) we want to carry on with the | |
1845 | rest of them. Also, it is desirable to send more than one message down the SMTP | |
1846 | connection if there are several waiting, provided we haven't already sent so | |
1847 | many as to hit the configured limit. The function transport_check_waiting looks | |
1848 | for a waiting message and returns its id. Then transport_pass_socket tries to | |
1849 | set up a continued delivery by passing the socket on to another process. The | |
1850 | variable send_rset is FALSE if a message has just been successfully transfered. | |
1851 | ||
1852 | If we are already sending down a continued channel, there may be further | |
1853 | addresses not yet delivered that are aimed at the same host, but which have not | |
1854 | been passed in this run of the transport. In this case, continue_more will be | |
1855 | true, and all we should do is send RSET if necessary, and return, leaving the | |
1856 | channel open. | |
1857 | ||
1858 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we | |
1859 | do not want to continue with other messages down the same channel, because that | |
1860 | can lead to looping between two or more messages, all with the same, | |
1861 | temporarily failing address(es). [The retry information isn't updated yet, so | |
1862 | new processes keep on trying.] We probably also don't want to try more of this | |
1863 | message's addresses either. | |
1864 | ||
1865 | If we have started a TLS session, we have to end it before passing the | |
1866 | connection to a new process. However, not all servers can handle this (Exim | |
1867 | can), so we do not pass such a connection on if the host matches | |
1868 | hosts_nopass_tls. */ | |
1869 | ||
1870 | DEBUG(D_transport) | |
1871 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " | |
1872 | "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset, | |
1873 | continue_more, yield, (first_addr == NULL)? "":"not "); | |
1874 | ||
1875 | if (completed_address && ok && send_quit) | |
1876 | { | |
1877 | BOOL more; | |
1878 | if (first_addr != NULL || continue_more || | |
1879 | ( | |
1880 | (tls_active < 0 || | |
1881 | verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name, | |
1882 | host->address, NULL) != OK) | |
1883 | && | |
1884 | transport_check_waiting(tblock->name, host->name, | |
1885 | tblock->connection_max_messages, new_message_id, &more) | |
1886 | )) | |
1887 | { | |
1888 | uschar *msg; | |
447d236c | 1889 | BOOL pass_message; |
0756eb3c PH |
1890 | |
1891 | if (send_rset) | |
1892 | { | |
1893 | if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0)) | |
1894 | { | |
1895 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, | |
1896 | host->address, strerror(save_errno)); | |
1897 | send_quit = FALSE; | |
1898 | } | |
1899 | else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1900 | ob->command_timeout))) | |
1901 | { | |
1902 | int code; | |
447d236c PH |
1903 | send_quit = check_response(host, &errno, 0, buffer, &code, &msg, |
1904 | &pass_message); | |
0756eb3c PH |
1905 | if (!send_quit) |
1906 | { | |
1907 | DEBUG(D_transport) debug_printf("%s\n", msg); | |
1908 | } | |
1909 | } | |
1910 | } | |
1911 | ||
1912 | /* Either RSET was not needed, or it succeeded */ | |
1913 | ||
1914 | if (ok) | |
1915 | { | |
1916 | if (first_addr != NULL) /* More addresses still to be sent */ | |
1917 | { /* in this run of the transport */ | |
1918 | continue_sequence++; /* Causes * in logging */ | |
1919 | goto SEND_MESSAGE; | |
1920 | } | |
1921 | if (continue_more) return yield; /* More addresses for another run */ | |
1922 | ||
1923 | /* Pass the socket to a new Exim process. Before doing so, we must shut | |
1924 | down TLS. Not all MTAs allow for the continuation of the SMTP session | |
1925 | when TLS is shut down. We test for this by sending a new EHLO. If we | |
1926 | don't get a good response, we don't attempt to pass the socket on. */ | |
1927 | ||
1928 | #ifdef SUPPORT_TLS | |
1929 | if (tls_active >= 0) | |
1930 | { | |
1931 | tls_close(TRUE); | |
1932 | ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 && | |
1933 | smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1934 | ob->command_timeout); | |
1935 | } | |
1936 | #endif | |
1937 | ||
1938 | /* If the socket is successfully passed, we musn't send QUIT (or | |
1939 | indeed anything!) from here. */ | |
1940 | ||
1941 | if (ok && transport_pass_socket(tblock->name, host->name, host->address, | |
1942 | new_message_id, inblock.sock)) | |
1943 | { | |
1944 | send_quit = FALSE; | |
1945 | } | |
1946 | } | |
1947 | ||
1948 | /* If RSET failed and there are addresses left, they get deferred. */ | |
1949 | ||
447d236c | 1950 | else set_errno(first_addr, errno, msg, DEFER, FALSE); |
0756eb3c PH |
1951 | } |
1952 | } | |
1953 | ||
1954 | /* End off tidily with QUIT unless the connection has died or the socket has | |
1955 | been passed to another process. There has been discussion on the net about what | |
1956 | to do after sending QUIT. The wording of the RFC suggests that it is necessary | |
1957 | to wait for a response, but on the other hand, there isn't anything one can do | |
1958 | with an error response, other than log it. Exim used to do that. However, | |
1959 | further discussion suggested that it is positively advantageous not to wait for | |
1960 | the response, but to close the session immediately. This is supposed to move | |
1961 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some | |
1962 | load from the server. (Hosts that are both servers and clients may not see much | |
1963 | difference, of course.) Further discussion indicated that this was safe to do | |
1964 | on Unix systems which have decent implementations of TCP/IP that leave the | |
1965 | connection around for a while (TIME_WAIT) after the application has gone away. | |
1966 | This enables the response sent by the server to be properly ACKed rather than | |
1967 | timed out, as can happen on broken TCP/IP implementations on other OS. | |
1968 | ||
1969 | This change is being made on 31-Jul-98. After over a year of trouble-free | |
1970 | operation, the old commented-out code was removed on 17-Sep-99. */ | |
1971 | ||
1972 | SEND_QUIT: | |
1973 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
1974 | ||
1975 | END_OFF: | |
1976 | ||
1977 | #ifdef SUPPORT_TLS | |
1978 | tls_close(TRUE); | |
1979 | #endif | |
1980 | ||
1981 | /* Close the socket, and return the appropriate value, first setting | |
1982 | continue_transport and continue_hostname NULL to prevent any other addresses | |
1983 | that may include the host from trying to re-use a continuation socket. This | |
1984 | works because the NULL setting is passed back to the calling process, and | |
1985 | remote_max_parallel is forced to 1 when delivering over an existing connection, | |
1986 | ||
1987 | If all went well and continue_more is set, we shouldn't actually get here if | |
1988 | there are further addresses, as the return above will be taken. However, | |
1989 | writing RSET might have failed, or there may be other addresses whose hosts are | |
1990 | specified in the transports, and therefore not visible at top level, in which | |
1991 | case continue_more won't get set. */ | |
1992 | ||
f1e894f3 | 1993 | (void)close(inblock.sock); |
0756eb3c PH |
1994 | continue_transport = NULL; |
1995 | continue_hostname = NULL; | |
1996 | return yield; | |
1997 | } | |
1998 | ||
1999 | ||
2000 | ||
2001 | ||
2002 | /************************************************* | |
2003 | * Closedown entry point * | |
2004 | *************************************************/ | |
2005 | ||
2006 | /* This function is called when exim is passed an open smtp channel | |
2007 | from another incarnation, but the message which it has been asked | |
2008 | to deliver no longer exists. The channel is on stdin. | |
2009 | ||
2010 | We might do fancy things like looking for another message to send down | |
2011 | the channel, but if the one we sought has gone, it has probably been | |
2012 | delivered by some other process that itself will seek further messages, | |
2013 | so just close down our connection. | |
2014 | ||
2015 | Argument: pointer to the transport instance block | |
2016 | Returns: nothing | |
2017 | */ | |
2018 | ||
2019 | void | |
2020 | smtp_transport_closedown(transport_instance *tblock) | |
2021 | { | |
2022 | smtp_transport_options_block *ob = | |
2023 | (smtp_transport_options_block *)(tblock->options_block); | |
2024 | smtp_inblock inblock; | |
2025 | smtp_outblock outblock; | |
2026 | uschar buffer[256]; | |
2027 | uschar inbuffer[4096]; | |
2028 | uschar outbuffer[16]; | |
2029 | ||
2030 | inblock.sock = fileno(stdin); | |
2031 | inblock.buffer = inbuffer; | |
2032 | inblock.buffersize = sizeof(inbuffer); | |
2033 | inblock.ptr = inbuffer; | |
2034 | inblock.ptrend = inbuffer; | |
2035 | ||
2036 | outblock.sock = inblock.sock; | |
2037 | outblock.buffersize = sizeof(outbuffer); | |
2038 | outblock.buffer = outbuffer; | |
2039 | outblock.ptr = outbuffer; | |
2040 | outblock.cmd_count = 0; | |
2041 | outblock.authenticating = FALSE; | |
2042 | ||
2043 | (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
2044 | (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
2045 | ob->command_timeout); | |
f1e894f3 | 2046 | (void)close(inblock.sock); |
0756eb3c PH |
2047 | } |
2048 | ||
2049 | ||
2050 | ||
2051 | /************************************************* | |
2052 | * Prepare addresses for delivery * | |
2053 | *************************************************/ | |
2054 | ||
2055 | /* This function is called to flush out error settings from previous delivery | |
2056 | attempts to other hosts. It also records whether we got here via an MX record | |
2057 | or not in the more_errno field of the address. We are interested only in | |
2058 | addresses that are still marked DEFER - others may have got delivered to a | |
2059 | previously considered IP address. Set their status to PENDING_DEFER to indicate | |
2060 | which ones are relevant this time. | |
2061 | ||
2062 | Arguments: | |
2063 | addrlist the list of addresses | |
2064 | host the host we are delivering to | |
2065 | ||
2066 | Returns: the first address for this delivery | |
2067 | */ | |
2068 | ||
2069 | static address_item * | |
2070 | prepare_addresses(address_item *addrlist, host_item *host) | |
2071 | { | |
2072 | address_item *first_addr = NULL; | |
2073 | address_item *addr; | |
2074 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2075 | { | |
2076 | if (addr->transport_return != DEFER) continue; | |
2077 | if (first_addr == NULL) first_addr = addr; | |
2078 | addr->transport_return = PENDING_DEFER; | |
2079 | addr->basic_errno = 0; | |
2080 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; | |
2081 | addr->message = NULL; | |
2082 | #ifdef SUPPORT_TLS | |
2083 | addr->cipher = NULL; | |
2084 | addr->peerdn = NULL; | |
2085 | #endif | |
2086 | } | |
2087 | return first_addr; | |
2088 | } | |
2089 | ||
2090 | ||
2091 | ||
2092 | /************************************************* | |
2093 | * Main entry point * | |
2094 | *************************************************/ | |
2095 | ||
2096 | /* See local README for interface details. As this is a remote transport, it is | |
2097 | given a chain of addresses to be delivered in one connection, if possible. It | |
2098 | always returns TRUE, indicating that each address has its own independent | |
2099 | status set, except if there is a setting up problem, in which case it returns | |
2100 | FALSE. */ | |
2101 | ||
2102 | BOOL | |
2103 | smtp_transport_entry( | |
2104 | transport_instance *tblock, /* data for this instantiation */ | |
2105 | address_item *addrlist) /* addresses we are working on */ | |
2106 | { | |
2107 | int cutoff_retry; | |
2108 | int port; | |
2109 | int hosts_defer = 0; | |
2110 | int hosts_fail = 0; | |
2111 | int hosts_looked_up = 0; | |
2112 | int hosts_retry = 0; | |
2113 | int hosts_serial = 0; | |
2114 | int hosts_total = 0; | |
8e669ac1 | 2115 | int total_hosts_tried = 0; |
0756eb3c PH |
2116 | address_item *addr; |
2117 | BOOL expired = TRUE; | |
2118 | BOOL continuing = continue_hostname != NULL; | |
2119 | uschar *expanded_hosts = NULL; | |
2120 | uschar *pistring; | |
2121 | uschar *tid = string_sprintf("%s transport", tblock->name); | |
2122 | smtp_transport_options_block *ob = | |
2123 | (smtp_transport_options_block *)(tblock->options_block); | |
2124 | host_item *hostlist = addrlist->host_list; | |
2125 | host_item *host = NULL; | |
2126 | ||
2127 | DEBUG(D_transport) | |
2128 | { | |
2129 | debug_printf("%s transport entered\n", tblock->name); | |
2130 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2131 | debug_printf(" %s\n", addr->address); | |
2132 | if (continuing) debug_printf("already connected to %s [%s]\n", | |
2133 | continue_hostname, continue_host_address); | |
2134 | } | |
2135 | ||
f6c332bd PH |
2136 | /* Set the flag requesting that these hosts be added to the waiting |
2137 | database if the delivery fails temporarily or if we are running with | |
2138 | queue_smtp or a 2-stage queue run. This gets unset for certain | |
2139 | kinds of error, typically those that are specific to the message. */ | |
2140 | ||
2141 | update_waiting = TRUE; | |
2142 | ||
0756eb3c PH |
2143 | /* If a host list is not defined for the addresses - they must all have the |
2144 | same one in order to be passed to a single transport - or if the transport has | |
2145 | a host list with hosts_override set, use the host list supplied with the | |
2146 | transport. It is an error for this not to exist. */ | |
2147 | ||
2148 | if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL)) | |
2149 | { | |
2150 | if (ob->hosts == NULL) | |
2151 | { | |
2152 | addrlist->message = string_sprintf("%s transport called with no hosts set", | |
2153 | tblock->name); | |
2154 | addrlist->transport_return = PANIC; | |
2155 | return FALSE; /* Only top address has status */ | |
2156 | } | |
2157 | ||
2158 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", | |
2159 | ob->hosts); | |
2160 | ||
2161 | /* If the transport's host list contains no '$' characters, and we are not | |
2162 | randomizing, it is fixed and therefore a chain of hosts can be built once | |
2163 | and for all, and remembered for subsequent use by other calls to this | |
2164 | transport. If, on the other hand, the host list does contain '$', or we are | |
2165 | randomizing its order, we have to rebuild it each time. In the fixed case, | |
2166 | as the hosts string will never be used again, it doesn't matter that we | |
2167 | replace all the : characters with zeros. */ | |
2168 | ||
2169 | if (ob->hostlist == NULL) | |
2170 | { | |
2171 | uschar *s = ob->hosts; | |
2172 | ||
2173 | if (Ustrchr(s, '$') != NULL) | |
2174 | { | |
2175 | expanded_hosts = expand_string(s); | |
2176 | if (expanded_hosts == NULL) | |
2177 | { | |
2178 | addrlist->message = string_sprintf("failed to expand list of hosts " | |
2179 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); | |
2180 | addrlist->transport_return = search_find_defer? DEFER : PANIC; | |
2181 | return FALSE; /* Only top address has status */ | |
2182 | } | |
2183 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " | |
2184 | "\"%s\"\n", s, expanded_hosts); | |
2185 | s = expanded_hosts; | |
2186 | } | |
2187 | else | |
2188 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); | |
2189 | ||
2190 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); | |
2191 | ||
2192 | /* If there was no expansion of hosts, save the host list for | |
2193 | next time. */ | |
2194 | ||
2195 | if (expanded_hosts == NULL) ob->hostlist = hostlist; | |
2196 | } | |
2197 | ||
2198 | /* This is not the first time this transport has been run in this delivery; | |
2199 | the host list was built previously. */ | |
2200 | ||
2201 | else hostlist = ob->hostlist; | |
2202 | } | |
2203 | ||
2204 | /* The host list was supplied with the address. If hosts_randomize is set, we | |
2205 | must sort it into a random order if it did not come from MX records and has not | |
2206 | already been randomized (but don't bother if continuing down an existing | |
2207 | connection). */ | |
2208 | ||
2209 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing) | |
2210 | { | |
2211 | host_item *newlist = NULL; | |
2212 | while (hostlist != NULL) | |
2213 | { | |
2214 | host_item *h = hostlist; | |
2215 | hostlist = hostlist->next; | |
2216 | ||
2217 | h->sort_key = random_number(100); | |
2218 | ||
2219 | if (newlist == NULL) | |
2220 | { | |
2221 | h->next = NULL; | |
2222 | newlist = h; | |
2223 | } | |
2224 | else if (h->sort_key < newlist->sort_key) | |
2225 | { | |
2226 | h->next = newlist; | |
2227 | newlist = h; | |
2228 | } | |
2229 | else | |
2230 | { | |
2231 | host_item *hh = newlist; | |
2232 | while (hh->next != NULL) | |
2233 | { | |
2234 | if (h->sort_key < hh->next->sort_key) break; | |
2235 | hh = hh->next; | |
2236 | } | |
2237 | h->next = hh->next; | |
2238 | hh->next = h; | |
2239 | } | |
2240 | } | |
2241 | ||
2242 | hostlist = addrlist->host_list = newlist; | |
2243 | } | |
2244 | ||
2245 | ||
2d280592 | 2246 | /* Sort out the default port. */ |
0756eb3c PH |
2247 | |
2248 | if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE; | |
0756eb3c PH |
2249 | |
2250 | ||
2251 | /* For each host-plus-IP-address on the list: | |
2252 | ||
2253 | . If this is a continued delivery and the host isn't the one with the | |
2254 | current connection, skip. | |
2255 | ||
2256 | . If the status is unusable (i.e. previously failed or retry checked), skip. | |
2257 | ||
2258 | . If no IP address set, get the address, either by turning the name into | |
2259 | an address, calling gethostbyname if gethostbyname is on, or by calling | |
2260 | the DNS. The DNS may yield multiple addresses, in which case insert the | |
2261 | extra ones into the list. | |
2262 | ||
2263 | . Get the retry data if not previously obtained for this address and set the | |
2264 | field which remembers the state of this address. Skip if the retry time is | |
2265 | not reached. If not, remember whether retry data was found. The retry string | |
2266 | contains both the name and the IP address. | |
2267 | ||
2268 | . Scan the list of addresses and mark those whose status is DEFER as | |
2269 | PENDING_DEFER. These are the only ones that will be processed in this cycle | |
2270 | of the hosts loop. | |
2271 | ||
2272 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. | |
2273 | Some addresses may be successfully delivered, others may fail, and yet | |
2274 | others may get temporary errors and so get marked DEFER. | |
2275 | ||
2276 | . The return from the delivery attempt is OK if a connection was made and a | |
2277 | valid SMTP dialogue was completed. Otherwise it is DEFER. | |
2278 | ||
2279 | . If OK, add a "remove" retry item for this host/IPaddress, if any. | |
2280 | ||
2281 | . If fail to connect, or other defer state, add a retry item. | |
2282 | ||
2283 | . If there are any addresses whose status is still DEFER, carry on to the | |
2284 | next host/IPaddress, unless we have tried the number of hosts given | |
533244af | 2285 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that |
8e669ac1 PH |
2286 | there is some fancy logic for hosts_max_try that means its limit can be |
2287 | overstepped in some circumstances. | |
0756eb3c PH |
2288 | |
2289 | If we get to the end of the list, all hosts have deferred at least one address, | |
2290 | or not reached their retry times. If delay_after_cutoff is unset, it requests a | |
2291 | delivery attempt to those hosts whose last try was before the arrival time of | |
2292 | the current message. To cope with this, we have to go round the loop a second | |
2293 | time. After that, set the status and error data for any addresses that haven't | |
2294 | had it set already. */ | |
2295 | ||
2296 | for (cutoff_retry = 0; expired && | |
2297 | cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2); | |
2298 | cutoff_retry++) | |
2299 | { | |
2300 | host_item *nexthost = NULL; | |
2301 | int unexpired_hosts_tried = 0; | |
2302 | ||
2303 | for (host = hostlist; | |
8e669ac1 | 2304 | host != NULL && |
533244af PH |
2305 | unexpired_hosts_tried < ob->hosts_max_try && |
2306 | total_hosts_tried < ob->hosts_max_try_hardlimit; | |
0756eb3c PH |
2307 | host = nexthost) |
2308 | { | |
2309 | int rc; | |
2310 | int host_af; | |
2311 | uschar *rs; | |
2312 | BOOL serialized = FALSE; | |
2313 | BOOL host_is_expired = FALSE; | |
2314 | BOOL message_defer = FALSE; | |
2315 | BOOL ifchanges = FALSE; | |
2316 | BOOL some_deferred = FALSE; | |
2317 | address_item *first_addr = NULL; | |
2318 | uschar *interface = NULL; | |
2319 | uschar *retry_host_key = NULL; | |
2320 | uschar *retry_message_key = NULL; | |
2321 | uschar *serialize_key = NULL; | |
2322 | ||
9c4e8f60 PH |
2323 | /* Default next host is next host. :-) But this can vary if the |
2324 | hosts_max_try limit is hit (see below). It may also be reset if a host | |
2325 | address is looked up here (in case the host was multihomed). */ | |
2326 | ||
2327 | nexthost = host->next; | |
2328 | ||
0756eb3c PH |
2329 | /* If the address hasn't yet been obtained from the host name, look it up |
2330 | now, unless the host is already marked as unusable. If it is marked as | |
2331 | unusable, it means that the router was unable to find its IP address (in | |
2332 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and | |
2333 | the lookup failed last time. We don't get this far if *all* MX records | |
2334 | point to non-existent hosts; that is treated as a hard error. | |
2335 | ||
2336 | We can just skip this host entirely. When the hosts came from the router, | |
2337 | the address will timeout based on the other host(s); when the address is | |
2338 | looked up below, there is an explicit retry record added. | |
2339 | ||
2340 | Note that we mustn't skip unusable hosts if the address is not unset; they | |
2341 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ | |
2342 | ||
2343 | if (host->address == NULL) | |
2344 | { | |
322050c2 | 2345 | int new_port, flags; |
7cd1141b | 2346 | host_item *hh; |
0756eb3c PH |
2347 | uschar *canonical_name; |
2348 | ||
2349 | if (host->status >= hstatus_unusable) | |
2350 | { | |
2351 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", | |
2352 | host->name); | |
2353 | continue; | |
2354 | } | |
2355 | ||
2356 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); | |
2357 | ||
7cd1141b PH |
2358 | /* The host name is permitted to have an attached port. Find it, and |
2359 | strip it from the name. Just remember it for now. */ | |
2360 | ||
2361 | new_port = host_item_get_port(host); | |
2362 | ||
2363 | /* Count hosts looked up */ | |
2364 | ||
0756eb3c PH |
2365 | hosts_looked_up++; |
2366 | ||
2367 | /* Find by name if so configured, or if it's an IP address. We don't | |
2368 | just copy the IP address, because we need the test-for-local to happen. */ | |
2369 | ||
322050c2 PH |
2370 | flags = HOST_FIND_BY_A; |
2371 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
2372 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
2373 | ||
7e66e54d | 2374 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL) != 0) |
322050c2 | 2375 | rc = host_find_byname(host, NULL, flags, &canonical_name, TRUE); |
0756eb3c | 2376 | else |
0756eb3c PH |
2377 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, |
2378 | &canonical_name, NULL); | |
0756eb3c | 2379 | |
7cd1141b PH |
2380 | /* Update the host (and any additional blocks, resulting from |
2381 | multihoming) with a host-specific port, if any. */ | |
2382 | ||
2383 | for (hh = host; hh != nexthost; hh = hh->next) hh->port = new_port; | |
2384 | ||
0756eb3c PH |
2385 | /* Failure to find the host at this time (usually DNS temporary failure) |
2386 | is really a kind of routing failure rather than a transport failure. | |
2387 | Therefore we add a retry item of the routing kind, not to stop us trying | |
2388 | to look this name up here again, but to ensure the address gets timed | |
2389 | out if the failures go on long enough. A complete failure at this point | |
2390 | commonly points to a configuration error, but the best action is still | |
2391 | to carry on for the next host. */ | |
2392 | ||
2393 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED) | |
2394 | { | |
2395 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); | |
2396 | expired = FALSE; | |
2397 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; | |
2398 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? | |
2399 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); | |
2400 | host->status = hstatus_unusable; | |
2401 | ||
2402 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2403 | { | |
2404 | if (addr->transport_return != DEFER) continue; | |
2405 | addr->basic_errno = ERRNO_UNKNOWNHOST; | |
2406 | addr->message = | |
2407 | string_sprintf("failed to lookup IP address for %s", host->name); | |
2408 | } | |
2409 | continue; | |
2410 | } | |
2411 | ||
2412 | /* If the host is actually the local host, we may have a problem, or | |
2413 | there may be some cunning configuration going on. In the problem case, | |
2414 | log things and give up. The default transport status is already DEFER. */ | |
2415 | ||
2416 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) | |
2417 | { | |
2418 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2419 | { | |
2420 | addr->basic_errno = 0; | |
2421 | addr->message = string_sprintf("%s transport found host %s to be " | |
2422 | "local", tblock->name, host->name); | |
2423 | } | |
2424 | goto END_TRANSPORT; | |
2425 | } | |
2426 | } /* End of block for IP address lookup */ | |
2427 | ||
2428 | /* If this is a continued delivery, we are interested only in the host | |
2429 | which matches the name of the existing open channel. The check is put | |
2430 | here after the local host lookup, in case the name gets expanded as a | |
2431 | result of the lookup. Set expired FALSE, to save the outer loop executing | |
2432 | twice. */ | |
2433 | ||
2434 | if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 || | |
2435 | Ustrcmp(continue_host_address, host->address) != 0)) | |
2436 | { | |
2437 | expired = FALSE; | |
2438 | continue; /* With next host */ | |
2439 | } | |
2440 | ||
9c4e8f60 PH |
2441 | /* Reset the default next host in case a multihomed host whose addresses |
2442 | are not looked up till just above added to the host list. */ | |
83364d30 PH |
2443 | |
2444 | nexthost = host->next; | |
2445 | ||
0756eb3c PH |
2446 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the |
2447 | domain is in queue_smtp_domains, we don't actually want to attempt any | |
2448 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If | |
2449 | there is a lookup defer in queue_smtp_domains, proceed as if the domain | |
2450 | were not in it. We don't want to hold up all SMTP deliveries! Except when | |
2451 | doing a two-stage queue run, don't do this if forcing. */ | |
2452 | ||
2453 | if ((!deliver_force || queue_2stage) && (queue_smtp || | |
cf39cf57 PH |
2454 | match_isinlist(addrlist->domain, &queue_smtp_domains, 0, |
2455 | &domainlist_anchor, NULL, MCL_DOMAIN, TRUE, NULL) == OK)) | |
0756eb3c PH |
2456 | { |
2457 | expired = FALSE; | |
2458 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2459 | { | |
2460 | if (addr->transport_return != DEFER) continue; | |
2461 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; | |
2462 | } | |
2463 | continue; /* With next host */ | |
2464 | } | |
2465 | ||
2466 | /* Count hosts being considered - purely for an intelligent comment | |
2467 | if none are usable. */ | |
2468 | ||
2469 | hosts_total++; | |
2470 | ||
2471 | /* Set $host and $host address now in case they are needed for the | |
2472 | interface expansion or the serialize_hosts check; they remain set if an | |
2473 | actual delivery happens. */ | |
2474 | ||
2475 | deliver_host = host->name; | |
2476 | deliver_host_address = host->address; | |
2477 | ||
7cd1141b PH |
2478 | /* Set up a string for adding to the retry key if the port number is not |
2479 | the standard SMTP port. A host may have its own port setting that overrides | |
2480 | the default. */ | |
2481 | ||
2482 | pistring = string_sprintf(":%d", (host->port == PORT_NONE)? | |
2483 | port : host->port); | |
2484 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; | |
2485 | ||
0756eb3c PH |
2486 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface |
2487 | string changes upon expansion, we must add it to the key that is used for | |
2488 | retries, because connections to the same host from a different interface | |
2489 | should be treated separately. */ | |
2490 | ||
2491 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6; | |
2492 | if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges, | |
2493 | &interface, tid)) | |
2494 | return FALSE; | |
2495 | if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface); | |
2496 | ||
2497 | /* The first time round the outer loop, check the status of the host by | |
2498 | inspecting the retry data. The second time round, we are interested only | |
2499 | in expired hosts that haven't been tried since this message arrived. */ | |
2500 | ||
2501 | if (cutoff_retry == 0) | |
2502 | { | |
2503 | /* Ensure the status of the address is set by checking retry data if | |
2504 | necessary. There maybe host-specific retry data (applicable to all | |
2505 | messages) and also data for retries of a specific message at this host. | |
2506 | If either of these retry records are actually read, the keys used are | |
2507 | returned to save recomputing them later. */ | |
2508 | ||
2509 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, | |
2510 | ob->retry_include_ip_address, &retry_host_key, &retry_message_key); | |
2511 | ||
2512 | DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name, | |
2513 | (host->address == NULL)? US"" : host->address, pistring, | |
2514 | (host->status == hstatus_usable)? "usable" : | |
2515 | (host->status == hstatus_unusable)? "unusable" : | |
2516 | (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?"); | |
2517 | ||
2518 | /* Skip this address if not usable at this time, noting if it wasn't | |
2519 | actually expired, both locally and in the address. */ | |
2520 | ||
2521 | switch (host->status) | |
2522 | { | |
2523 | case hstatus_unusable: | |
2524 | expired = FALSE; | |
2525 | setflag(addrlist, af_retry_skipped); | |
2526 | /* Fall through */ | |
2527 | ||
2528 | case hstatus_unusable_expired: | |
2529 | switch (host->why) | |
2530 | { | |
2531 | case hwhy_retry: hosts_retry++; break; | |
2532 | case hwhy_failed: hosts_fail++; break; | |
2533 | case hwhy_deferred: hosts_defer++; break; | |
2534 | } | |
2535 | ||
2536 | /* If there was a retry message key, implying that previously there | |
2537 | was a message-specific defer, we don't want to update the list of | |
f6c332bd | 2538 | messages waiting for these hosts. */ |
0756eb3c | 2539 | |
f6c332bd | 2540 | if (retry_message_key != NULL) update_waiting = FALSE; |
0756eb3c PH |
2541 | continue; /* With the next host or IP address */ |
2542 | } | |
2543 | } | |
2544 | ||
2545 | /* Second time round the loop: if the address is set but expired, and | |
2546 | the message is newer than the last try, let it through. */ | |
2547 | ||
2548 | else | |
2549 | { | |
2550 | if (host->address == NULL || | |
2551 | host->status != hstatus_unusable_expired || | |
2552 | host->last_try > received_time) | |
2553 | continue; | |
2554 | DEBUG(D_transport) | |
2555 | debug_printf("trying expired host %s [%s]%s\n", | |
2556 | host->name, host->address, pistring); | |
2557 | host_is_expired = TRUE; | |
2558 | } | |
2559 | ||
2560 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; | |
2561 | it remains TRUE only if all hosts are expired and none are actually tried. | |
2562 | */ | |
2563 | ||
2564 | expired = FALSE; | |
2565 | ||
2566 | /* If this host is listed as one to which access must be serialized, | |
2567 | see if another Exim process has a connection to it, and if so, skip | |
2568 | this host. If not, update the database to record our connection to it | |
2569 | and remember this for later deletion. Do not do any of this if we are | |
2570 | sending the message down a pre-existing connection. */ | |
2571 | ||
2572 | if (!continuing && | |
2573 | verify_check_this_host(&(ob->serialize_hosts), NULL, host->name, | |
2574 | host->address, NULL) == OK) | |
2575 | { | |
2576 | serialize_key = string_sprintf("host-serialize-%s", host->name); | |
2577 | if (!enq_start(serialize_key)) | |
2578 | { | |
2579 | DEBUG(D_transport) | |
2580 | debug_printf("skipping host %s because another Exim process " | |
2581 | "is connected to it\n", host->name); | |
2582 | hosts_serial++; | |
2583 | continue; | |
2584 | } | |
2585 | serialized = TRUE; | |
2586 | } | |
2587 | ||
2588 | /* OK, we have an IP address that is not waiting for its retry time to | |
2589 | arrive (it might be expired) OR (second time round the loop) we have an | |
2590 | expired host that hasn't been tried since the message arrived. Have a go | |
2591 | at delivering the message to it. First prepare the addresses by flushing | |
2592 | out the result of previous attempts, and finding the first address that | |
2593 | is still to be delivered. */ | |
2594 | ||
2595 | first_addr = prepare_addresses(addrlist, host); | |
2596 | ||
2597 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", | |
2598 | message_id, host->name, host->address, addrlist->address, | |
2599 | (addrlist->next == NULL)? "" : ", ..."); | |
2600 | ||
2601 | set_process_info("delivering %s to %s [%s] (%s%s)", | |
2602 | message_id, host->name, host->address, addrlist->address, | |
2603 | (addrlist->next == NULL)? "" : ", ..."); | |
2604 | ||
2605 | /* This is not for real; don't do the delivery. If there are | |
2606 | any remaining hosts, list them. */ | |
2607 | ||
2608 | if (dont_deliver) | |
2609 | { | |
2610 | host_item *host2; | |
447d236c | 2611 | set_errno(addrlist, 0, NULL, OK, FALSE); |
0756eb3c PH |
2612 | for (addr = addrlist; addr != NULL; addr = addr->next) |
2613 | { | |
2614 | addr->host_used = host; | |
2615 | addr->special_action = '*'; | |
2616 | addr->message = US"delivery bypassed by -N option"; | |
2617 | } | |
2618 | DEBUG(D_transport) | |
2619 | { | |
2620 | debug_printf("*** delivery by %s transport bypassed by -N option\n" | |
2621 | "*** host and remaining hosts:\n", tblock->name); | |
2622 | for (host2 = host; host2 != NULL; host2 = host2->next) | |
2623 | debug_printf(" %s [%s]\n", host2->name, | |
2624 | (host2->address == NULL)? US"unset" : host2->address); | |
2625 | } | |
2626 | rc = OK; | |
2627 | } | |
2628 | ||
2629 | /* This is for real. If the host is expired, we don't count it for | |
2630 | hosts_max_retry. This ensures that all hosts must expire before an address | |
8e669ac1 | 2631 | is timed out, unless hosts_max_try_hardlimit (which protects against |
533244af | 2632 | lunatic DNS configurations) is reached. |
8e669ac1 | 2633 | |
533244af PH |
2634 | If the host is not expired and we are about to hit the hosts_max_retry |
2635 | limit, check to see if there is a subsequent hosts with a different MX | |
2636 | value. If so, make that the next host, and don't count this one. This is a | |
2637 | heuristic to make sure that different MXs do get tried. With a normal kind | |
2638 | of retry rule, they would get tried anyway when the earlier hosts were | |
2639 | delayed, but if the domain has a "retry every time" type of rule - as is | |
2640 | often used for the the very large ISPs, that won't happen. */ | |
0756eb3c PH |
2641 | |
2642 | else | |
2643 | { | |
2644 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) | |
2645 | { | |
2646 | host_item *h; | |
2647 | DEBUG(D_transport) | |
2648 | debug_printf("hosts_max_try limit reached with this host\n"); | |
2649 | for (h = host; h != NULL; h = h->next) | |
2650 | if (h->mx != host->mx) break; | |
2651 | if (h != NULL) | |
2652 | { | |
2653 | nexthost = h; | |
2654 | unexpired_hosts_tried--; | |
2655 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " | |
2656 | "and will be tried\n"); | |
2657 | } | |
2658 | } | |
2659 | ||
2660 | /* Attempt the delivery. */ | |
2661 | ||
533244af | 2662 | total_hosts_tried++; |
0756eb3c PH |
2663 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, |
2664 | expanded_hosts != NULL, &message_defer, FALSE); | |
2665 | ||
2666 | /* Yield is one of: | |
2667 | OK => connection made, each address contains its result; | |
2668 | message_defer is set for message-specific defers (when all | |
2669 | recipients are marked defer) | |
2670 | DEFER => there was a non-message-specific delivery problem; | |
2671 | ERROR => there was a problem setting up the arguments for a filter, | |
2672 | or there was a problem with expanding added headers | |
2673 | */ | |
2674 | ||
2675 | /* If the result is not OK, there was a non-message-specific problem. | |
2676 | If the result is DEFER, we need to write to the logs saying what happened | |
2677 | for this particular host, except in the case of authentication and TLS | |
2678 | failures, where the log has already been written. If all hosts defer a | |
2679 | general message is written at the end. */ | |
2680 | ||
2681 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL && | |
2682 | first_addr->basic_errno != ERRNO_TLSFAILURE) | |
2683 | write_logs(first_addr, host); | |
2684 | ||
2685 | /* If STARTTLS was accepted, but there was a failure in setting up the | |
2686 | TLS session (usually a certificate screwup), and the host is not in | |
2687 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with | |
2688 | TLS forcibly turned off. We have to start from scratch with a new SMTP | |
2689 | connection. That's why the retry is done from here, not from within | |
2690 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the | |
2691 | session, so the in-clear transmission after those errors, if permitted, | |
2692 | happens inside smtp_deliver().] */ | |
2693 | ||
2694 | #ifdef SUPPORT_TLS | |
2695 | if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE && | |
2696 | ob->tls_tempfail_tryclear && | |
2697 | verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, | |
2698 | host->address, NULL) != OK) | |
2699 | { | |
2700 | log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted " | |
2701 | "to %s [%s] (not in hosts_require_tls)", host->name, host->address); | |
2702 | first_addr = prepare_addresses(addrlist, host); | |
2703 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, | |
2704 | expanded_hosts != NULL, &message_defer, TRUE); | |
2705 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) | |
2706 | write_logs(first_addr, host); | |
2707 | } | |
2708 | #endif | |
2709 | } | |
2710 | ||
2711 | /* Delivery attempt finished */ | |
2712 | ||
2713 | rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)? | |
2714 | US"ERROR" : US"?"; | |
2715 | ||
2716 | set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s", | |
2717 | message_id, host->name, host->address, addrlist->address, | |
2718 | (addrlist->next == NULL)? "" : " (& others)", rs); | |
2719 | ||
2720 | /* Release serialization if set up */ | |
2721 | ||
2722 | if (serialized) enq_end(serialize_key); | |
2723 | ||
2724 | /* If the result is DEFER, or if a host retry record is known to exist, we | |
2725 | need to add an item to the retry chain for updating the retry database | |
2726 | at the end of delivery. We only need to add the item to the top address, | |
2727 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it | |
2728 | for any other delivery attempts using the same address. (It is copied into | |
2729 | the unusable tree at the outer level, so even if different address blocks | |
2730 | contain the same address, it still won't get tried again.) */ | |
2731 | ||
2732 | if (rc == DEFER || retry_host_key != NULL) | |
2733 | { | |
2734 | int delete_flag = (rc != DEFER)? rf_delete : 0; | |
2735 | if (retry_host_key == NULL) | |
2736 | { | |
2737 | retry_host_key = ob->retry_include_ip_address? | |
2738 | string_sprintf("T:%S:%s%s", host->name, host->address, pistring) : | |
2739 | string_sprintf("T:%S%s", host->name, pistring); | |
2740 | } | |
2741 | ||
2742 | /* If a delivery of another message over an existing SMTP connection | |
2743 | yields DEFER, we do NOT set up retry data for the host. This covers the | |
2744 | case when there are delays in routing the addresses in the second message | |
2745 | that are so long that the server times out. This is alleviated by not | |
2746 | routing addresses that previously had routing defers when handling an | |
2747 | existing connection, but even so, this case may occur (e.g. if a | |
2748 | previously happily routed address starts giving routing defers). If the | |
2749 | host is genuinely down, another non-continued message delivery will | |
2750 | notice it soon enough. */ | |
2751 | ||
2752 | if (delete_flag != 0 || !continuing) | |
2753 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); | |
2754 | ||
2755 | /* We may have tried an expired host, if its retry time has come; ensure | |
2756 | the status reflects the expiry for the benefit of any other addresses. */ | |
2757 | ||
2758 | if (rc == DEFER) | |
2759 | { | |
2760 | host->status = (host_is_expired)? | |
2761 | hstatus_unusable_expired : hstatus_unusable; | |
2762 | host->why = hwhy_deferred; | |
2763 | } | |
2764 | } | |
2765 | ||
2766 | /* If message_defer is set (host was OK, but every recipient got deferred | |
2767 | because of some message-specific problem), or if that had happened | |
2768 | previously so that a message retry key exists, add an appropriate item | |
2769 | to the retry chain. Note that if there was a message defer but now there is | |
2770 | a host defer, the message defer record gets deleted. That seems perfectly | |
2771 | reasonable. Also, stop the message from being remembered as waiting | |
f6c332bd | 2772 | for specific hosts. */ |
0756eb3c PH |
2773 | |
2774 | if (message_defer || retry_message_key != NULL) | |
2775 | { | |
2776 | int delete_flag = message_defer? 0 : rf_delete; | |
2777 | if (retry_message_key == NULL) | |
2778 | { | |
2779 | retry_message_key = ob->retry_include_ip_address? | |
2780 | string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, | |
2781 | message_id) : | |
2782 | string_sprintf("T:%S%s:%s", host->name, pistring, message_id); | |
2783 | } | |
2784 | retry_add_item(addrlist, retry_message_key, | |
2785 | rf_message | rf_host | delete_flag); | |
f6c332bd | 2786 | update_waiting = FALSE; |
0756eb3c PH |
2787 | } |
2788 | ||
2789 | /* Any return other than DEFER (that is, OK or ERROR) means that the | |
2790 | addresses have got their final statuses filled in for this host. In the OK | |
2791 | case, see if any of them are deferred. */ | |
2792 | ||
2793 | if (rc == OK) | |
2794 | { | |
2795 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2796 | { | |
2797 | if (addr->transport_return == DEFER) | |
2798 | { | |
2799 | some_deferred = TRUE; | |
2800 | break; | |
2801 | } | |
2802 | } | |
2803 | } | |
2804 | ||
2805 | /* If no addresses deferred or the result was ERROR, return. We do this for | |
2806 | ERROR because a failing filter set-up or add_headers expansion is likely to | |
2807 | fail for any host we try. */ | |
2808 | ||
2809 | if (rc == ERROR || (rc == OK && !some_deferred)) | |
2810 | { | |
2811 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
2812 | return TRUE; /* Each address has its status */ | |
2813 | } | |
2814 | ||
2815 | /* If the result was DEFER or some individual addresses deferred, let | |
2816 | the loop run to try other hosts with the deferred addresses, except for the | |
2817 | case when we were trying to deliver down an existing channel and failed. | |
2818 | Don't try any other hosts in this case. */ | |
2819 | ||
2820 | if (continuing) break; | |
2821 | ||
2822 | /* If the whole delivery, or some individual addresses, were deferred and | |
2823 | there are more hosts that could be tried, do not count this host towards | |
2824 | the hosts_max_try limit if the age of the message is greater than the | |
2825 | maximum retry time for this host. This means we may try try all hosts, | |
2826 | ignoring the limit, when messages have been around for some time. This is | |
2827 | important because if we don't try all hosts, the address will never time | |
533244af | 2828 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ |
0756eb3c PH |
2829 | |
2830 | if ((rc == DEFER || some_deferred) && nexthost != NULL) | |
2831 | { | |
2832 | BOOL timedout; | |
2833 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); | |
2834 | ||
2835 | if (retry != NULL && retry->rules != NULL) | |
2836 | { | |
2837 | retry_rule *last_rule; | |
2838 | for (last_rule = retry->rules; | |
2839 | last_rule->next != NULL; | |
2840 | last_rule = last_rule->next); | |
2841 | timedout = time(NULL) - received_time > last_rule->timeout; | |
2842 | } | |
2843 | else timedout = TRUE; /* No rule => timed out */ | |
2844 | ||
2845 | if (timedout) | |
2846 | { | |
2847 | unexpired_hosts_tried--; | |
2848 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " | |
2849 | "hosts_max_try (message older than host's retry time)\n"); | |
2850 | } | |
2851 | } | |
2852 | } /* End of loop for trying multiple hosts. */ | |
2853 | ||
2854 | /* This is the end of the loop that repeats iff expired is TRUE and | |
2855 | ob->delay_after_cutoff is FALSE. The second time round we will | |
2856 | try those hosts that haven't been tried since the message arrived. */ | |
2857 | ||
2858 | DEBUG(D_transport) | |
2859 | { | |
2860 | debug_printf("all IP addresses skipped or deferred at least one address\n"); | |
2861 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) | |
2862 | debug_printf("retrying IP addresses not tried since message arrived\n"); | |
2863 | } | |
2864 | } | |
2865 | ||
2866 | ||
2867 | /* Get here if all IP addresses are skipped or defer at least one address. In | |
2868 | MUA wrapper mode, this will happen only for connection or other non-message- | |
2869 | specific failures. Force the delivery status for all addresses to FAIL. */ | |
2870 | ||
2871 | if (mua_wrapper) | |
2872 | { | |
2873 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2874 | addr->transport_return = FAIL; | |
2875 | goto END_TRANSPORT; | |
2876 | } | |
2877 | ||
2878 | /* In the normal, non-wrapper case, add a standard message to each deferred | |
2879 | address if there hasn't been an error, that is, if it hasn't actually been | |
2880 | tried this time. The variable "expired" will be FALSE if any deliveries were | |
2881 | actually tried, or if there was at least one host that was not expired. That | |
2882 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If | |
2883 | a delivery has been tried, an error code will be set, and the failing of the | |
2884 | message is handled by the retry code later. | |
2885 | ||
2886 | If queue_smtp is set, or this transport was called to send a subsequent message | |
2887 | down an existing TCP/IP connection, and something caused the host not to be | |
2888 | found, we end up here, but can detect these cases and handle them specially. */ | |
2889 | ||
2890 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2891 | { | |
2892 | /* If host is not NULL, it means that we stopped processing the host list | |
533244af PH |
2893 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this |
2894 | means we need to behave as if some hosts were skipped because their retry | |
2895 | time had not come. Specifically, this prevents the address from timing out. | |
8e669ac1 | 2896 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all |
533244af | 2897 | hosts were tried. */ |
0756eb3c PH |
2898 | |
2899 | if (host != NULL) | |
2900 | { | |
533244af PH |
2901 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
2902 | { | |
2903 | DEBUG(D_transport) | |
2904 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " | |
2905 | "hosts were tried\n"); | |
2906 | } | |
2907 | else | |
8e669ac1 | 2908 | { |
533244af PH |
2909 | DEBUG(D_transport) |
2910 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); | |
2911 | setflag(addr, af_retry_skipped); | |
8e669ac1 | 2912 | } |
0756eb3c PH |
2913 | } |
2914 | ||
2915 | if (queue_smtp) /* no deliveries attempted */ | |
2916 | { | |
2917 | addr->transport_return = DEFER; | |
2918 | addr->basic_errno = 0; | |
2919 | addr->message = US"SMTP delivery explicitly queued"; | |
2920 | } | |
2921 | ||
2922 | else if (addr->transport_return == DEFER && | |
2923 | (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) && | |
2924 | addr->message == NULL) | |
2925 | { | |
2926 | addr->basic_errno = ERRNO_HRETRY; | |
2927 | if (continue_hostname != NULL) | |
2928 | { | |
2929 | addr->message = US"no host found for existing SMTP connection"; | |
2930 | } | |
2931 | else if (expired) | |
2932 | { | |
fffffe4c | 2933 | setflag(addr, af_pass_message); /* This is not a security risk */ |
0756eb3c PH |
2934 | addr->message = (ob->delay_after_cutoff)? |
2935 | US"retry time not reached for any host after a long failure period" : | |
2936 | US"all hosts have been failing for a long time and were last tried " | |
2937 | "after this message arrived"; | |
2938 | ||
2939 | /* If we are already using fallback hosts, or there are no fallback hosts | |
2940 | defined, convert the result to FAIL to cause a bounce. */ | |
2941 | ||
2942 | if (addr->host_list == addr->fallback_hosts || | |
2943 | addr->fallback_hosts == NULL) | |
2944 | addr->transport_return = FAIL; | |
2945 | } | |
2946 | else | |
2947 | { | |
2948 | if (hosts_retry == hosts_total) | |
2949 | addr->message = US"retry time not reached for any host"; | |
2950 | else if (hosts_fail == hosts_total) | |
2951 | addr->message = US"all host address lookups failed permanently"; | |
2952 | else if (hosts_defer == hosts_total) | |
2953 | addr->message = US"all host address lookups failed temporarily"; | |
2954 | else if (hosts_serial == hosts_total) | |
2955 | addr->message = US"connection limit reached for all hosts"; | |
2956 | else if (hosts_fail+hosts_defer == hosts_total) | |
2957 | addr->message = US"all host address lookups failed"; | |
2958 | else addr->message = US"some host address lookups failed and retry time " | |
2959 | "not reached for other hosts or connection limit reached"; | |
2960 | } | |
2961 | } | |
2962 | } | |
2963 | ||
2964 | /* Update the database which keeps information about which messages are waiting | |
f6c332bd PH |
2965 | for which hosts to become available. For some message-specific errors, the |
2966 | update_waiting flag is turned off because we don't want follow-on deliveries in | |
2967 | those cases. */ | |
0756eb3c | 2968 | |
f6c332bd | 2969 | if (update_waiting) transport_update_waiting(hostlist, tblock->name); |
0756eb3c PH |
2970 | |
2971 | END_TRANSPORT: | |
2972 | ||
2973 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
2974 | ||
2975 | return TRUE; /* Each address has its status */ | |
2976 | } | |
2977 | ||
2978 | /* End of transport/smtp.c */ |