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1 | /* $Cambridge: exim/src/src/transports/smtp.c,v 1.1 2004/10/07 13:10:02 ph10 Exp $ */ |
2 | ||
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Copyright (c) University of Cambridge 1995 - 2004 */ | |
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[] = { | |
24 | { "allow_localhost", opt_bool, | |
25 | (void *)offsetof(smtp_transport_options_block, allow_localhost) }, | |
26 | { "authenticated_sender", opt_stringptr, | |
27 | (void *)offsetof(smtp_transport_options_block, authenticated_sender) }, | |
28 | { "command_timeout", opt_time, | |
29 | (void *)offsetof(smtp_transport_options_block, command_timeout) }, | |
30 | { "connect_timeout", opt_time, | |
31 | (void *)offsetof(smtp_transport_options_block, connect_timeout) }, | |
32 | { "connection_max_messages", opt_int | opt_public, | |
33 | (void *)offsetof(transport_instance, connection_max_messages) }, | |
34 | { "data_timeout", opt_time, | |
35 | (void *)offsetof(smtp_transport_options_block, data_timeout) }, | |
36 | { "delay_after_cutoff", opt_bool, | |
37 | (void *)offsetof(smtp_transport_options_block, delay_after_cutoff) }, | |
38 | { "dns_qualify_single", opt_bool, | |
39 | (void *)offsetof(smtp_transport_options_block, dns_qualify_single) }, | |
40 | { "dns_search_parents", opt_bool, | |
41 | (void *)offsetof(smtp_transport_options_block, dns_search_parents) }, | |
42 | { "fallback_hosts", opt_stringptr, | |
43 | (void *)offsetof(smtp_transport_options_block, fallback_hosts) }, | |
44 | { "final_timeout", opt_time, | |
45 | (void *)offsetof(smtp_transport_options_block, final_timeout) }, | |
46 | { "gethostbyname", opt_bool, | |
47 | (void *)offsetof(smtp_transport_options_block, gethostbyname) }, | |
48 | { "helo_data", opt_stringptr, | |
49 | (void *)offsetof(smtp_transport_options_block, helo_data) }, | |
50 | { "hosts", opt_stringptr, | |
51 | (void *)offsetof(smtp_transport_options_block, hosts) }, | |
52 | { "hosts_avoid_esmtp", opt_stringptr, | |
53 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_esmtp) }, | |
54 | #ifdef SUPPORT_TLS | |
55 | { "hosts_avoid_tls", opt_stringptr, | |
56 | (void *)offsetof(smtp_transport_options_block, hosts_avoid_tls) }, | |
57 | #endif | |
58 | { "hosts_max_try", opt_int, | |
59 | (void *)offsetof(smtp_transport_options_block, hosts_max_try) }, | |
60 | #ifdef SUPPORT_TLS | |
61 | { "hosts_nopass_tls", opt_stringptr, | |
62 | (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) }, | |
63 | #endif | |
64 | { "hosts_override", opt_bool, | |
65 | (void *)offsetof(smtp_transport_options_block, hosts_override) }, | |
66 | { "hosts_randomize", opt_bool, | |
67 | (void *)offsetof(smtp_transport_options_block, hosts_randomize) }, | |
68 | { "hosts_require_auth", opt_stringptr, | |
69 | (void *)offsetof(smtp_transport_options_block, hosts_require_auth) }, | |
70 | #ifdef SUPPORT_TLS | |
71 | { "hosts_require_tls", opt_stringptr, | |
72 | (void *)offsetof(smtp_transport_options_block, hosts_require_tls) }, | |
73 | #endif | |
74 | { "hosts_try_auth", opt_stringptr, | |
75 | (void *)offsetof(smtp_transport_options_block, hosts_try_auth) }, | |
76 | { "interface", opt_stringptr, | |
77 | (void *)offsetof(smtp_transport_options_block, interface) }, | |
78 | { "keepalive", opt_bool, | |
79 | (void *)offsetof(smtp_transport_options_block, keepalive) }, | |
80 | { "max_rcpt", opt_int | opt_public, | |
81 | (void *)offsetof(transport_instance, max_addresses) }, | |
82 | { "multi_domain", opt_bool | opt_public, | |
83 | (void *)offsetof(transport_instance, multi_domain) }, | |
84 | { "port", opt_stringptr, | |
85 | (void *)offsetof(smtp_transport_options_block, port) }, | |
86 | { "protocol", opt_stringptr, | |
87 | (void *)offsetof(smtp_transport_options_block, protocol) }, | |
88 | { "retry_include_ip_address", opt_bool, | |
89 | (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) }, | |
90 | { "serialize_hosts", opt_stringptr, | |
91 | (void *)offsetof(smtp_transport_options_block, serialize_hosts) }, | |
92 | { "size_addition", opt_int, | |
93 | (void *)offsetof(smtp_transport_options_block, size_addition) } | |
94 | #ifdef SUPPORT_TLS | |
95 | ,{ "tls_certificate", opt_stringptr, | |
96 | (void *)offsetof(smtp_transport_options_block, tls_certificate) }, | |
97 | { "tls_crl", opt_stringptr, | |
98 | (void *)offsetof(smtp_transport_options_block, tls_crl) }, | |
99 | { "tls_privatekey", opt_stringptr, | |
100 | (void *)offsetof(smtp_transport_options_block, tls_privatekey) }, | |
101 | { "tls_require_ciphers", opt_stringptr, | |
102 | (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) }, | |
103 | { "tls_tempfail_tryclear", opt_bool, | |
104 | (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) }, | |
105 | { "tls_verify_certificates", opt_stringptr, | |
106 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) } | |
107 | #endif | |
108 | }; | |
109 | ||
110 | /* Size of the options list. An extern variable has to be used so that its | |
111 | address can appear in the tables drtables.c. */ | |
112 | ||
113 | int smtp_transport_options_count = | |
114 | sizeof(smtp_transport_options)/sizeof(optionlist); | |
115 | ||
116 | /* Default private options block for the smtp transport. */ | |
117 | ||
118 | smtp_transport_options_block smtp_transport_option_defaults = { | |
119 | NULL, /* hosts */ | |
120 | NULL, /* fallback_hosts */ | |
121 | NULL, /* hostlist */ | |
122 | NULL, /* fallback_hostlist */ | |
123 | NULL, /* authenticated_sender */ | |
124 | US"$primary_hostname", /* helo_data */ | |
125 | NULL, /* interface */ | |
126 | NULL, /* port */ | |
127 | US"smtp", /* protocol */ | |
128 | NULL, /* serialize_hosts */ | |
129 | NULL, /* hosts_try_auth */ | |
130 | NULL, /* hosts_require_auth */ | |
131 | NULL, /* hosts_require_tls */ | |
132 | NULL, /* hosts_avoid_tls */ | |
133 | NULL, /* hosts_avoid_esmtp */ | |
134 | NULL, /* hosts_nopass_tls */ | |
135 | 5*60, /* command_timeout */ | |
136 | 5*60, /* connect_timeout; shorter system default overrides */ | |
137 | 5*60, /* data timeout */ | |
138 | 10*60, /* final timeout */ | |
139 | 1024, /* size_addition */ | |
140 | 5, /* hosts_max_try */ | |
141 | FALSE, /* allow_localhost */ | |
142 | FALSE, /* gethostbyname */ | |
143 | TRUE, /* dns_qualify_single */ | |
144 | FALSE, /* dns_search_parents */ | |
145 | TRUE, /* delay_after_cutoff */ | |
146 | FALSE, /* hosts_override */ | |
147 | FALSE, /* hosts_randomize */ | |
148 | TRUE, /* keepalive */ | |
149 | TRUE /* retry_include_ip_address */ | |
150 | #ifdef SUPPORT_TLS | |
151 | ,NULL, /* tls_certificate */ | |
152 | NULL, /* tls_crl */ | |
153 | NULL, /* tls_privatekey */ | |
154 | NULL, /* tls_require_ciphers */ | |
155 | NULL, /* tls_verify_certificates */ | |
156 | TRUE /* tls_tempfail_tryclear */ | |
157 | #endif | |
158 | }; | |
159 | ||
160 | ||
161 | /* Local statics */ | |
162 | ||
163 | static uschar *smtp_command; /* Points to last cmd for error messages */ | |
164 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ | |
165 | ||
166 | ||
167 | /************************************************* | |
168 | * Setup entry point * | |
169 | *************************************************/ | |
170 | ||
171 | /* This function is called when the transport is about to be used, | |
172 | but before running it in a sub-process. It is used for two things: | |
173 | ||
174 | (1) To set the fallback host list in addresses, when delivering. | |
175 | (2) To pass back the interface, port, and protocol options, for use during | |
176 | callout verification. | |
177 | ||
178 | Arguments: | |
179 | tblock pointer to the transport instance block | |
180 | addrlist list of addresses about to be transported | |
181 | tf if not NULL, pointer to block in which to return options | |
182 | errmsg place for error message (not used) | |
183 | ||
184 | Returns: OK always (FAIL, DEFER not used) | |
185 | */ | |
186 | ||
187 | static int | |
188 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, | |
189 | transport_feedback *tf, uschar **errmsg) | |
190 | { | |
191 | smtp_transport_options_block *ob = | |
192 | (smtp_transport_options_block *)(tblock->options_block); | |
193 | ||
194 | errmsg = errmsg; /* Keep picky compilers happy */ | |
195 | ||
196 | /* Pass back options if required. This interface is getting very messy. */ | |
197 | ||
198 | if (tf != NULL) | |
199 | { | |
200 | tf->interface = ob->interface; | |
201 | tf->port = ob->port; | |
202 | tf->protocol = ob->protocol; | |
203 | tf->hosts = ob->hosts; | |
204 | tf->hosts_override = ob->hosts_override; | |
205 | tf->hosts_randomize = ob->hosts_randomize; | |
206 | tf->gethostbyname = ob->gethostbyname; | |
207 | tf->qualify_single = ob->dns_qualify_single; | |
208 | tf->search_parents = ob->dns_search_parents; | |
209 | } | |
210 | ||
211 | /* Set the fallback host list for all the addresses that don't have fallback | |
212 | host lists, provided that the local host wasn't present in the original host | |
213 | list. */ | |
214 | ||
215 | if (!testflag(addrlist, af_local_host_removed)) | |
216 | { | |
217 | for (; addrlist != NULL; addrlist = addrlist->next) | |
218 | if (addrlist->fallback_hosts == NULL) | |
219 | addrlist->fallback_hosts = ob->fallback_hostlist; | |
220 | } | |
221 | ||
222 | return OK; | |
223 | } | |
224 | ||
225 | ||
226 | ||
227 | /************************************************* | |
228 | * Initialization entry point * | |
229 | *************************************************/ | |
230 | ||
231 | /* Called for each instance, after its options have been read, to | |
232 | enable consistency checks to be done, or anything else that needs | |
233 | to be set up. | |
234 | ||
235 | Argument: pointer to the transport instance block | |
236 | Returns: nothing | |
237 | */ | |
238 | ||
239 | void | |
240 | smtp_transport_init(transport_instance *tblock) | |
241 | { | |
242 | smtp_transport_options_block *ob = | |
243 | (smtp_transport_options_block *)(tblock->options_block); | |
244 | ||
245 | /* Retry_use_local_part defaults FALSE if unset */ | |
246 | ||
247 | if (tblock->retry_use_local_part == TRUE_UNSET) | |
248 | tblock->retry_use_local_part = FALSE; | |
249 | ||
250 | /* Set the default port according to the protocol */ | |
251 | ||
252 | if (ob->port == NULL) | |
253 | ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : US"smtp"; | |
254 | ||
255 | /* Set up the setup entry point, to be called before subprocesses for this | |
256 | transport. */ | |
257 | ||
258 | tblock->setup = smtp_transport_setup; | |
259 | ||
260 | /* Complain if any of the timeouts are zero. */ | |
261 | ||
262 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || | |
263 | ob->final_timeout <= 0) | |
264 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
265 | "command, data, or final timeout value is zero for %s transport", | |
266 | tblock->name); | |
267 | ||
268 | /* If hosts_override is set and there are local hosts, set the global | |
269 | flag that stops verify from showing router hosts. */ | |
270 | ||
271 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; | |
272 | ||
273 | /* If there are any fallback hosts listed, build a chain of host items | |
274 | for them, but do not do any lookups at this time. */ | |
275 | ||
276 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); | |
277 | } | |
278 | ||
279 | ||
280 | ||
281 | ||
282 | ||
283 | /************************************************* | |
284 | * Set delivery info into all active addresses * | |
285 | *************************************************/ | |
286 | ||
287 | /* Only addresses whose status is >= PENDING are relevant. A lesser | |
288 | status means that an address is not currently being processed. | |
289 | ||
290 | Arguments: | |
291 | addrlist points to a chain of addresses | |
292 | errno_value to put in each address's errno field | |
293 | msg to put in each address's message field | |
294 | rc to put in each address's transport_return field | |
295 | ||
296 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in | |
297 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate | |
298 | this particular type of timeout. | |
299 | ||
300 | Returns: nothing | |
301 | */ | |
302 | ||
303 | static | |
304 | void set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc) | |
305 | { | |
306 | address_item *addr; | |
307 | int orvalue = 0; | |
308 | if (errno_value == ERRNO_CONNECTTIMEOUT) | |
309 | { | |
310 | errno_value = ETIMEDOUT; | |
311 | orvalue = RTEF_CTOUT; | |
312 | } | |
313 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
314 | { | |
315 | if (addr->transport_return < PENDING) continue; | |
316 | addr->basic_errno = errno_value; | |
317 | addr->more_errno |= orvalue; | |
318 | if (msg != NULL) addr->message = msg; | |
319 | addr->transport_return = rc; | |
320 | } | |
321 | } | |
322 | ||
323 | ||
324 | ||
325 | /************************************************* | |
326 | * Check an SMTP response * | |
327 | *************************************************/ | |
328 | ||
329 | /* This function is given an errno code and the SMTP response buffer | |
330 | to analyse, together with the host identification for generating messages. It | |
331 | sets an appropriate message and puts the first digit of the response code into | |
332 | the yield variable. If no response was actually read, a suitable digit is | |
333 | chosen. | |
334 | ||
335 | Arguments: | |
336 | host the current host, to get its name for messages | |
337 | errno_value pointer to the errno value | |
338 | more_errno from the top address for use with ERRNO_FILTER_FAIL | |
339 | buffer the SMTP response buffer | |
340 | yield where to put a one-digit SMTP response code | |
341 | message where to put an errror message | |
342 | ||
343 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE | |
344 | */ | |
345 | ||
346 | static BOOL check_response(host_item *host, int *errno_value, int more_errno, | |
347 | uschar *buffer, int *yield, uschar **message) | |
348 | { | |
349 | uschar *pl = US""; | |
350 | ||
351 | if (smtp_use_pipelining && | |
352 | (Ustrcmp(smtp_command, "MAIL") == 0 || | |
353 | Ustrcmp(smtp_command, "RCPT") == 0 || | |
354 | Ustrcmp(smtp_command, "DATA") == 0)) | |
355 | pl = US"pipelined "; | |
356 | ||
357 | *yield = '4'; /* Default setting is to give a temporary error */ | |
358 | ||
359 | /* Handle response timeout */ | |
360 | ||
361 | if (*errno_value == ETIMEDOUT) | |
362 | { | |
363 | *message = US string_sprintf("SMTP timeout while connected to %s [%s] " | |
364 | "after %s%s", host->name, host->address, pl, smtp_command); | |
365 | if (transport_count > 0) | |
366 | *message = US string_sprintf("%s (%d bytes written)", *message, | |
367 | transport_count); | |
368 | return FALSE; | |
369 | } | |
370 | ||
371 | /* Handle malformed SMTP response */ | |
372 | ||
373 | if (*errno_value == ERRNO_SMTPFORMAT) | |
374 | { | |
375 | uschar *malfresp = string_printing(buffer); | |
376 | while (isspace(*malfresp)) malfresp++; | |
377 | if (*malfresp == 0) | |
378 | *message = string_sprintf("Malformed SMTP reply (an empty line) from " | |
379 | "%s [%s] in response to %s%s", host->name, host->address, pl, | |
380 | smtp_command); | |
381 | else | |
382 | *message = string_sprintf("Malformed SMTP reply from %s [%s] in response " | |
383 | "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp); | |
384 | return FALSE; | |
385 | } | |
386 | ||
387 | /* Handle a failed filter process error; can't send QUIT as we mustn't | |
388 | end the DATA. */ | |
389 | ||
390 | if (*errno_value == ERRNO_FILTER_FAIL) | |
391 | { | |
392 | *message = US string_sprintf("transport filter process failed (%d)", | |
393 | more_errno); | |
394 | return FALSE; | |
395 | } | |
396 | ||
397 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't | |
398 | end the DATA. */ | |
399 | ||
400 | if (*errno_value == ERRNO_CHHEADER_FAIL) | |
401 | { | |
402 | *message = | |
403 | US string_sprintf("failed to expand headers_add or headers_remove: %s", | |
404 | expand_string_message); | |
405 | return FALSE; | |
406 | } | |
407 | ||
408 | /* Handle failure to write a complete data block */ | |
409 | ||
410 | if (*errno_value == ERRNO_WRITEINCOMPLETE) | |
411 | { | |
412 | *message = US string_sprintf("failed to write a data block"); | |
413 | return FALSE; | |
414 | } | |
415 | ||
416 | /* Handle error responses from the remote mailer. */ | |
417 | ||
418 | if (buffer[0] != 0) | |
419 | { | |
420 | uschar *s = string_printing(buffer); | |
421 | *message = US string_sprintf("SMTP error from remote mailer after %s%s: " | |
422 | "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s); | |
423 | *yield = buffer[0]; | |
424 | return TRUE; | |
425 | } | |
426 | ||
427 | /* No data was read. If there is no errno, this must be the EOF (i.e. | |
428 | connection closed) case, which causes deferral. Otherwise, put the host's | |
429 | identity in the message, leaving the errno value to be interpreted as well. In | |
430 | all cases, we have to assume the connection is now dead. */ | |
431 | ||
432 | if (*errno_value == 0) | |
433 | { | |
434 | *errno_value = ERRNO_SMTPCLOSED; | |
435 | *message = US string_sprintf("Remote host %s [%s] closed connection " | |
436 | "in response to %s%s", host->name, host->address, pl, smtp_command); | |
437 | } | |
438 | else *message = US string_sprintf("%s [%s]", host->name, host->address); | |
439 | ||
440 | return FALSE; | |
441 | } | |
442 | ||
443 | ||
444 | ||
445 | /************************************************* | |
446 | * Write error message to logs * | |
447 | *************************************************/ | |
448 | ||
449 | /* This writes to the main log and to the message log. | |
450 | ||
451 | Arguments: | |
452 | addr the address item containing error information | |
453 | host the current host | |
454 | ||
455 | Returns: nothing | |
456 | */ | |
457 | ||
458 | static void | |
459 | write_logs(address_item *addr, host_item *host) | |
460 | { | |
461 | if (addr->message != NULL) | |
462 | { | |
463 | uschar *message = addr->message; | |
464 | if (addr->basic_errno > 0) | |
465 | message = string_sprintf("%s: %s", message, strerror(addr->basic_errno)); | |
466 | log_write(0, LOG_MAIN, "%s", message); | |
467 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); | |
468 | } | |
469 | else | |
470 | { | |
471 | log_write(0, LOG_MAIN, "%s [%s]: %s", | |
472 | host->name, | |
473 | host->address, | |
474 | strerror(addr->basic_errno)); | |
475 | deliver_msglog("%s %s [%s]: %s\n", | |
476 | tod_stamp(tod_log), | |
477 | host->name, | |
478 | host->address, | |
479 | strerror(addr->basic_errno)); | |
480 | } | |
481 | } | |
482 | ||
483 | ||
484 | ||
485 | /************************************************* | |
486 | * Synchronize SMTP responses * | |
487 | *************************************************/ | |
488 | ||
489 | /* This function is called from smtp_deliver() to receive SMTP responses from | |
490 | the server, and match them up with the commands to which they relate. When | |
491 | PIPELINING is not in use, this function is called after every command, and is | |
492 | therefore somewhat over-engineered, but it is simpler to use a single scheme | |
493 | that works both with and without PIPELINING instead of having two separate sets | |
494 | of code. | |
495 | ||
496 | The set of commands that are buffered up with pipelining may start with MAIL | |
497 | and may end with DATA; in between are RCPT commands that correspond to the | |
498 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, | |
499 | etc.) are never buffered. | |
500 | ||
501 | Errors after MAIL or DATA abort the whole process leaving the response in the | |
502 | buffer. After MAIL, pending responses are flushed, and the original command is | |
503 | re-instated in big_buffer for error messages. For RCPT commands, the remote is | |
504 | permitted to reject some recipient addresses while accepting others. However | |
505 | certain errors clearly abort the whole process. Set the value in | |
506 | transport_return to PENDING_OK if the address is accepted. If there is a | |
507 | subsequent general error, it will get reset accordingly. If not, it will get | |
508 | converted to OK at the end. | |
509 | ||
510 | Arguments: | |
511 | addrlist the complete address list | |
512 | include_affixes TRUE if affixes include in RCPT | |
513 | sync_addr ptr to the ptr of the one to start scanning at (updated) | |
514 | host the host we are connected to | |
515 | count the number of responses to read | |
516 | pending_MAIL true if the first response is for MAIL | |
517 | pending_DATA 0 if last command sent was not DATA | |
518 | +1 if previously had a good recipient | |
519 | -1 if not previously had a good recipient | |
520 | inblock incoming SMTP block | |
521 | timeout timeout value | |
522 | buffer buffer for reading response | |
523 | buffsize size of buffer | |
524 | ||
525 | Returns: 3 if at least one address had 2xx and one had 5xx | |
526 | 2 if at least one address had 5xx but none had 2xx | |
527 | 1 if at least one host had a 2xx response, but none had 5xx | |
528 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) | |
529 | -1 timeout while reading RCPT response | |
530 | -2 I/O or other non-response error for RCPT | |
531 | -3 DATA or MAIL failed - errno and buffer set | |
532 | */ | |
533 | ||
534 | static int | |
535 | sync_responses(address_item *addrlist, BOOL include_affixes, | |
536 | address_item **sync_addr, host_item *host, int count, BOOL pending_MAIL, | |
537 | int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer, | |
538 | int buffsize) | |
539 | { | |
540 | address_item *addr = *sync_addr; | |
541 | int yield = 0; | |
542 | ||
543 | /* Handle the response for a MAIL command. On error, reinstate the original | |
544 | command in big_buffer for error message use, and flush any further pending | |
545 | responses before returning, except after I/O errors and timeouts. */ | |
546 | ||
547 | if (pending_MAIL) | |
548 | { | |
549 | count--; | |
550 | if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
551 | { | |
552 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ | |
553 | if (errno == 0 && buffer[0] != 0) | |
554 | { | |
555 | uschar flushbuffer[4096]; | |
556 | while (count-- > 0) | |
557 | { | |
558 | if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer), | |
559 | '2', timeout) | |
560 | && (errno != 0 || flushbuffer[0] == 0)) | |
561 | break; | |
562 | } | |
563 | } | |
564 | return -3; | |
565 | } | |
566 | } | |
567 | ||
568 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
569 | ||
570 | /* Read and handle the required number of RCPT responses, matching each one up | |
571 | with an address by scanning for the next address whose status is PENDING_DEFER. | |
572 | */ | |
573 | ||
574 | while (count-- > 0) | |
575 | { | |
576 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; | |
577 | ||
578 | /* The address was accepted */ | |
579 | ||
580 | if (smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
581 | { | |
582 | yield |= 1; | |
583 | addr->transport_return = PENDING_OK; | |
584 | ||
585 | /* If af_dr_retry_exists is set, there was a routing delay on this address; | |
586 | ensure that any address-specific retry record is expunged. */ | |
587 | ||
588 | if (testflag(addr, af_dr_retry_exists)) | |
589 | retry_add_item(addr, addr->address_retry_key, rf_delete); | |
590 | } | |
591 | ||
592 | /* Timeout while reading the response */ | |
593 | ||
594 | else if (errno == ETIMEDOUT) | |
595 | { | |
596 | int save_errno = errno; | |
597 | uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] " | |
598 | "after RCPT TO:<%s>", host->name, host->address, | |
599 | transport_rcpt_address(addr, include_affixes)); | |
600 | set_errno(addrlist, save_errno, message, DEFER); | |
601 | retry_add_item(addr, addr->address_retry_key, 0); | |
602 | host->update_waiting = FALSE; | |
603 | return -1; | |
604 | } | |
605 | ||
606 | /* Handle other errors in obtaining an SMTP response by returning -1. This | |
607 | will cause all the addresses to be deferred. Restore the SMTP command in | |
608 | big_buffer for which we are checking the response, so the error message | |
609 | makes sense. */ | |
610 | ||
611 | else if (errno != 0 || buffer[0] == 0) | |
612 | { | |
613 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", | |
614 | transport_rcpt_address(addr, include_affixes)); | |
615 | return -2; | |
616 | } | |
617 | ||
618 | /* Handle SMTP permanent and temporary response codes. */ | |
619 | ||
620 | else | |
621 | { | |
622 | addr->message = | |
623 | string_sprintf("SMTP error from remote mailer after RCPT TO:<%s>: " | |
624 | "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes), | |
625 | host->name, host->address, string_printing(buffer)); | |
626 | deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message); | |
627 | ||
628 | /* The response was 5xx */ | |
629 | ||
630 | if (buffer[0] == '5') | |
631 | { | |
632 | addr->transport_return = FAIL; | |
633 | yield |= 2; | |
634 | } | |
635 | ||
636 | /* The response was 4xx */ | |
637 | ||
638 | else | |
639 | { | |
640 | int bincode = (buffer[1] - '0')*10 + buffer[2] - '0'; | |
641 | ||
642 | addr->transport_return = DEFER; | |
643 | addr->basic_errno = ERRNO_RCPT4XX; | |
644 | addr->more_errno |= bincode << 8; | |
645 | ||
646 | /* Log temporary errors if there are more hosts to be tried. */ | |
647 | ||
648 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message); | |
649 | ||
650 | /* Do not put this message on the list of those waiting for this host, | |
651 | as otherwise it is likely to be tried too often. */ | |
652 | ||
653 | host->update_waiting = FALSE; | |
654 | ||
655 | /* Add a retry item for the address so that it doesn't get tried | |
656 | again too soon. */ | |
657 | ||
658 | retry_add_item(addr, addr->address_retry_key, 0); | |
659 | } | |
660 | } | |
661 | } /* Loop for next RCPT response */ | |
662 | ||
663 | /* Update where to start at for the next block of responses, unless we | |
664 | have already handled all the addresses. */ | |
665 | ||
666 | if (addr != NULL) *sync_addr = addr->next; | |
667 | ||
668 | /* Handle a response to DATA. If we have not had any good recipients, either | |
669 | previously or in this block, the response is ignored. */ | |
670 | ||
671 | if (pending_DATA != 0 && | |
672 | !smtp_read_response(inblock, buffer, buffsize, '3', timeout)) | |
673 | { | |
674 | int code; | |
675 | uschar *msg; | |
676 | if (pending_DATA > 0 || (yield & 1) != 0) return -3; | |
677 | (void)check_response(host, &errno, 0, buffer, &code, &msg); | |
678 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " | |
679 | "is in use and there were no good recipients\n", msg); | |
680 | } | |
681 | ||
682 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if | |
683 | present) received 3xx. If any RCPTs were handled and yielded anything other | |
684 | than 4xx, yield will be set non-zero. */ | |
685 | ||
686 | return yield; | |
687 | } | |
688 | ||
689 | ||
690 | ||
691 | /************************************************* | |
692 | * Deliver address list to given host * | |
693 | *************************************************/ | |
694 | ||
695 | /* If continue_hostname is not null, we get here only when continuing to | |
696 | deliver down an existing channel. The channel was passed as the standard | |
697 | input. | |
698 | ||
699 | Otherwise, we have to make a connection to the remote host, and do the | |
700 | initial protocol exchange. | |
701 | ||
702 | When running as an MUA wrapper, if the sender or any recipient is rejected, | |
703 | temporarily or permanently, we force failure for all recipients. | |
704 | ||
705 | Arguments: | |
706 | addrlist chain of potential addresses to deliver; only those whose | |
707 | transport_return field is set to PENDING_DEFER are currently | |
708 | being processed; others should be skipped - they have either | |
709 | been delivered to an earlier host or IP address, or been | |
710 | failed by one of them. | |
711 | host host to deliver to | |
712 | host_af AF_INET or AF_INET6 | |
713 | port TCP/IP port to use, in host byte order | |
714 | interface interface to bind to, or NULL | |
715 | tblock transport instance block | |
716 | copy_host TRUE if host set in addr->host_used must be copied, because | |
717 | it is specific to this call of the transport | |
718 | message_defer set TRUE if yield is OK, but all addresses were deferred | |
719 | because of a non-recipient, non-host failure, that is, a | |
720 | 4xx response to MAIL FROM, DATA, or ".". This is a defer | |
721 | that is specific to the message. | |
722 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for | |
723 | a second attempt after TLS initialization fails | |
724 | ||
725 | Returns: OK - the connection was made and the delivery attempted; | |
726 | the result for each address is in its data block. | |
727 | DEFER - the connection could not be made, or something failed | |
728 | while setting up the SMTP session, or there was a | |
729 | non-message-specific error, such as a timeout. | |
730 | ERROR - a filter command is specified for this transport, | |
731 | and there was a problem setting it up; OR helo_data | |
732 | or add_headers or authenticated_sender is specified | |
733 | for this transport, and the string failed to expand | |
734 | */ | |
735 | ||
736 | static int | |
737 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port, | |
738 | uschar *interface, transport_instance *tblock, BOOL copy_host, | |
739 | BOOL *message_defer, BOOL suppress_tls) | |
740 | { | |
741 | address_item *addr; | |
742 | address_item *sync_addr; | |
743 | address_item *first_addr = addrlist; | |
744 | int yield = OK; | |
745 | int address_count; | |
746 | int save_errno; | |
747 | int rc; | |
748 | time_t start_delivery_time = time(NULL); | |
749 | smtp_transport_options_block *ob = | |
750 | (smtp_transport_options_block *)(tblock->options_block); | |
751 | BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0; | |
752 | BOOL ok = FALSE; | |
753 | BOOL send_rset = TRUE; | |
754 | BOOL send_quit = TRUE; | |
755 | BOOL setting_up = TRUE; | |
756 | BOOL completed_address = FALSE; | |
757 | BOOL esmtp = TRUE; | |
758 | BOOL pending_MAIL; | |
759 | smtp_inblock inblock; | |
760 | smtp_outblock outblock; | |
761 | int max_rcpt = tblock->max_addresses; | |
762 | uschar *local_authenticated_sender = authenticated_sender; | |
763 | uschar *helo_data; | |
764 | uschar *message = NULL; | |
765 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; | |
766 | uschar *p; | |
767 | uschar buffer[4096]; | |
768 | uschar inbuffer[4096]; | |
769 | uschar outbuffer[1024]; | |
770 | ||
771 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ | |
772 | ||
773 | *message_defer = FALSE; | |
774 | smtp_command = US"initial connection"; | |
775 | if (max_rcpt == 0) max_rcpt = 999999; | |
776 | ||
777 | /* Set up the buffer for reading SMTP response packets. */ | |
778 | ||
779 | inblock.buffer = inbuffer; | |
780 | inblock.buffersize = sizeof(inbuffer); | |
781 | inblock.ptr = inbuffer; | |
782 | inblock.ptrend = inbuffer; | |
783 | ||
784 | /* Set up the buffer for holding SMTP commands while pipelining */ | |
785 | ||
786 | outblock.buffer = outbuffer; | |
787 | outblock.buffersize = sizeof(outbuffer); | |
788 | outblock.ptr = outbuffer; | |
789 | outblock.cmd_count = 0; | |
790 | outblock.authenticating = FALSE; | |
791 | ||
792 | /* Expand the greeting message */ | |
793 | ||
794 | helo_data = expand_string(ob->helo_data); | |
795 | if (helo_data == NULL) | |
796 | { | |
797 | uschar *message = string_sprintf("failed to expand helo_data: %s", | |
798 | expand_string_message); | |
799 | set_errno(addrlist, 0, message, DEFER); | |
800 | return ERROR; | |
801 | } | |
802 | ||
803 | /* If an authenticated_sender override has been specified for this transport | |
804 | instance, expand it. If the expansion is forced to fail, and there was already | |
805 | an authenticated_sender for this message, the original value will be used. | |
806 | Other expansion failures are serious. An empty result is ignored, but there is | |
807 | otherwise no check - this feature is expected to be used with LMTP and other | |
808 | cases where non-standard addresses (e.g. without domains) might be required. */ | |
809 | ||
810 | if (ob->authenticated_sender != NULL) | |
811 | { | |
812 | uschar *new = expand_string(ob->authenticated_sender); | |
813 | if (new == NULL) | |
814 | { | |
815 | if (!expand_string_forcedfail) | |
816 | { | |
817 | uschar *message = string_sprintf("failed to expand " | |
818 | "authenticated_sender: %s", expand_string_message); | |
819 | set_errno(addrlist, 0, message, DEFER); | |
820 | return ERROR; | |
821 | } | |
822 | } | |
823 | else if (new[0] != 0) local_authenticated_sender = new; | |
824 | } | |
825 | ||
826 | /* Make a connection to the host if this isn't a continued delivery, and handle | |
827 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled | |
828 | specially so they can be identified for retries. */ | |
829 | ||
830 | if (continue_hostname == NULL) | |
831 | { | |
832 | inblock.sock = outblock.sock = | |
833 | smtp_connect(host, host_af, port, interface, ob->connect_timeout, | |
834 | ob->keepalive); | |
835 | if (inblock.sock < 0) | |
836 | { | |
837 | set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno, | |
838 | NULL, DEFER); | |
839 | return DEFER; | |
840 | } | |
841 | ||
842 | /* The first thing is to wait for an initial OK response. The dreaded "goto" | |
843 | is nevertheless a reasonably clean way of programming this kind of logic, | |
844 | where you want to escape on any error. */ | |
845 | ||
846 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
847 | ob->command_timeout)) goto RESPONSE_FAILED; | |
848 | ||
849 | /** Debugging without sending a message | |
850 | addrlist->transport_return = DEFER; | |
851 | goto SEND_QUIT; | |
852 | **/ | |
853 | ||
854 | /* Errors that occur after this point follow an SMTP command, which is | |
855 | left in big_buffer by smtp_write_command() for use in error messages. */ | |
856 | ||
857 | smtp_command = big_buffer; | |
858 | ||
859 | /* Tell the remote who we are... | |
860 | ||
861 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the | |
862 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the | |
863 | greeting is of this form. The assumption was that the far end supports it | |
864 | properly... but experience shows that there are some that give 5xx responses, | |
865 | even though the banner includes "ESMTP" (there's a bloody-minded one that | |
866 | says "ESMTP not spoken here"). Cope with that case. | |
867 | ||
868 | September 2000: Time has passed, and it seems reasonable now to always send | |
869 | EHLO at the start. It is also convenient to make the change while installing | |
870 | the TLS stuff. | |
871 | ||
872 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" | |
873 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There | |
874 | would be no way to send out the mails, so there is now a host list | |
875 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the | |
876 | PIPELINING problem as well. Maybe it can also be useful to cure other | |
877 | problems with broken servers. | |
878 | ||
879 | Exim originally sent "Helo" at this point and ran for nearly a year that way. | |
880 | Then somebody tried it with a Microsoft mailer... It seems that all other | |
881 | mailers use upper case for some reason (the RFC is quite clear about case | |
882 | independence) so, for peace of mind, I gave in. */ | |
883 | ||
884 | esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL, | |
885 | host->name, host->address, NULL) != OK; | |
886 | ||
887 | if (esmtp) | |
888 | { | |
889 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", | |
890 | lmtp? "LHLO" : "EHLO", helo_data) < 0) | |
891 | goto SEND_FAILED; | |
892 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
893 | ob->command_timeout)) | |
894 | { | |
895 | if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED; | |
896 | esmtp = FALSE; | |
897 | } | |
898 | } | |
899 | else | |
900 | { | |
901 | DEBUG(D_transport) | |
902 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
903 | } | |
904 | ||
905 | if (!esmtp) | |
906 | { | |
907 | if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0) | |
908 | goto SEND_FAILED; | |
909 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
910 | ob->command_timeout)) goto RESPONSE_FAILED; | |
911 | } | |
912 | ||
913 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ | |
914 | ||
915 | #ifdef SUPPORT_TLS | |
916 | tls_offered = esmtp && | |
917 | pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0, | |
918 | PCRE_EOPT, NULL, 0) >= 0; | |
919 | #endif | |
920 | } | |
921 | ||
922 | /* For continuing deliveries down the same channel, the socket is the standard | |
923 | input, and we don't need to redo EHLO here (but may need to do so for TLS - see | |
924 | below). Set up the pointer to where subsequent commands will be left, for | |
925 | error messages. Note that smtp_use_size and smtp_use_pipelining will have been | |
926 | set from the command line if they were set in the process that passed the | |
927 | connection on. */ | |
928 | ||
929 | else | |
930 | { | |
931 | inblock.sock = outblock.sock = fileno(stdin); | |
932 | smtp_command = big_buffer; | |
933 | } | |
934 | ||
935 | /* If TLS is available on this connection, whether continued or not, attempt to | |
936 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, | |
937 | send another EHLO - the server may give a different answer in secure mode. We | |
938 | use a separate buffer for reading the response to STARTTLS so that if it is | |
939 | negative, the original EHLO data is available for subsequent analysis, should | |
940 | the client not be required to use TLS. If the response is bad, copy the buffer | |
941 | for error analysis. */ | |
942 | ||
943 | #ifdef SUPPORT_TLS | |
944 | if (tls_offered && !suppress_tls && | |
945 | verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name, | |
946 | host->address, NULL) != OK) | |
947 | { | |
948 | uschar buffer2[4096]; | |
949 | if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0) | |
950 | goto SEND_FAILED; | |
951 | ||
952 | /* If there is an I/O error, transmission of this message is deferred. If | |
953 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is | |
954 | false, we also defer. However, if there is a temporary rejection of STARTTLS | |
955 | and tls_tempfail_tryclear is true, or if there is an outright rejection of | |
956 | STARTTLS, we carry on. This means we will try to send the message in clear, | |
957 | unless the host is in hosts_require_tls (tested below). */ | |
958 | ||
959 | if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2', | |
960 | ob->command_timeout)) | |
961 | { | |
962 | Ustrncpy(buffer, buffer2, sizeof(buffer)); | |
963 | if (errno != 0 || buffer2[0] == 0 || | |
964 | (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)) | |
965 | goto RESPONSE_FAILED; | |
966 | } | |
967 | ||
968 | /* STARTTLS accepted: try to negotiate a TLS session. */ | |
969 | ||
970 | else | |
971 | { | |
972 | int rc = tls_client_start(inblock.sock, host, addrlist, | |
973 | NULL, /* No DH param */ | |
974 | ob->tls_certificate, | |
975 | ob->tls_privatekey, | |
976 | ob->tls_verify_certificates, | |
977 | ob->tls_crl, | |
978 | ob->tls_require_ciphers, | |
979 | ob->command_timeout); | |
980 | ||
981 | /* TLS negotiation failed; give an error. From outside, this function may | |
982 | be called again to try in clear on a new connection, if the options permit | |
983 | it for this host. */ | |
984 | ||
985 | if (rc != OK) | |
986 | { | |
987 | save_errno = ERRNO_TLSFAILURE; | |
988 | message = US"failure while setting up TLS session"; | |
989 | send_quit = FALSE; | |
990 | goto TLS_FAILED; | |
991 | } | |
992 | ||
993 | /* TLS session is set up */ | |
994 | ||
995 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
996 | { | |
997 | addr->cipher = tls_cipher; | |
998 | addr->peerdn = tls_peerdn; | |
999 | } | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. */ | |
1004 | ||
1005 | if (tls_active >= 0) | |
1006 | { | |
1007 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", lmtp? "LHLO" : "EHLO", | |
1008 | helo_data) < 0) | |
1009 | goto SEND_FAILED; | |
1010 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1011 | ob->command_timeout)) | |
1012 | goto RESPONSE_FAILED; | |
1013 | } | |
1014 | ||
1015 | /* If the host is required to use a secure channel, ensure that we | |
1016 | have one. */ | |
1017 | ||
1018 | else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, | |
1019 | host->address, NULL) == OK) | |
1020 | { | |
1021 | save_errno = ERRNO_TLSREQUIRED; | |
1022 | message = string_sprintf("a TLS session is required for %s [%s], but %s", | |
1023 | host->name, host->address, | |
1024 | tls_offered? "an attempt to start TLS failed" : | |
1025 | "the server did not offer TLS support"); | |
1026 | goto TLS_FAILED; | |
1027 | } | |
1028 | #endif | |
1029 | ||
1030 | /* If TLS is active, we have just started it up and re-done the EHLO command, | |
1031 | so its response needs to be analyzed. If TLS is not active and this is a | |
1032 | continued session down a previously-used socket, we haven't just done EHLO, so | |
1033 | we skip this. */ | |
1034 | ||
1035 | if (continue_hostname == NULL | |
1036 | #ifdef SUPPORT_TLS | |
1037 | || tls_active >= 0 | |
1038 | #endif | |
1039 | ) | |
1040 | { | |
1041 | int require_auth; | |
1042 | uschar *fail_reason = US"server did not advertise AUTH support"; | |
1043 | ||
1044 | /* If the response to EHLO specified support for the SIZE parameter, note | |
1045 | this, provided size_addition is non-negative. */ | |
1046 | ||
1047 | smtp_use_size = esmtp && ob->size_addition >= 0 && | |
1048 | pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1049 | PCRE_EOPT, NULL, 0) >= 0; | |
1050 | ||
1051 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched | |
1052 | the current host, esmtp will be false, so PIPELINING can never be used. */ | |
1053 | ||
1054 | smtp_use_pipelining = esmtp && | |
1055 | pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1056 | PCRE_EOPT, NULL, 0) >= 0; | |
1057 | ||
1058 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", | |
1059 | smtp_use_pipelining? "" : "not "); | |
1060 | ||
1061 | /* Note if the response to EHLO specifies support for the AUTH extension. | |
1062 | If it has, check that this host is one we want to authenticate to, and do | |
1063 | the business. The host name and address must be available when the | |
1064 | authenticator's client driver is running. */ | |
1065 | ||
1066 | smtp_authenticated = FALSE; | |
1067 | require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL, | |
1068 | host->name, host->address, NULL); | |
1069 | ||
1070 | if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1)) | |
1071 | { | |
1072 | uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]); | |
1073 | expand_nmax = -1; /* reset */ | |
1074 | ||
1075 | /* Must not do this check until after we have saved the result of the | |
1076 | regex match above. */ | |
1077 | ||
1078 | if (require_auth == OK || | |
1079 | verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name, | |
1080 | host->address, NULL) == OK) | |
1081 | { | |
1082 | auth_instance *au; | |
1083 | fail_reason = US"no common mechanisms were found"; | |
1084 | ||
1085 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); | |
1086 | ||
1087 | /* Scan the configured authenticators looking for one which is configured | |
1088 | for use as a client and whose name matches an authentication mechanism | |
1089 | supported by the server. If one is found, attempt to authenticate by | |
1090 | calling its client function. */ | |
1091 | ||
1092 | for (au = auths; !smtp_authenticated && au != NULL; au = au->next) | |
1093 | { | |
1094 | uschar *p = names; | |
1095 | if (!au->client) continue; | |
1096 | ||
1097 | /* Loop to scan supported server mechanisms */ | |
1098 | ||
1099 | while (*p != 0) | |
1100 | { | |
1101 | int rc; | |
1102 | int len = Ustrlen(au->public_name); | |
1103 | while (isspace(*p)) p++; | |
1104 | ||
1105 | if (strncmpic(au->public_name, p, len) != 0 || | |
1106 | (p[len] != 0 && !isspace(p[len]))) | |
1107 | { | |
1108 | while (*p != 0 && !isspace(*p)) p++; | |
1109 | continue; | |
1110 | } | |
1111 | ||
1112 | /* Found data for a listed mechanism. Call its client entry. Set | |
1113 | a flag in the outblock so that data is overwritten after sending so | |
1114 | that reflections don't show it. */ | |
1115 | ||
1116 | fail_reason = US"authentication attempt(s) failed"; | |
1117 | outblock.authenticating = TRUE; | |
1118 | rc = (au->info->clientcode)(au, &inblock, &outblock, | |
1119 | ob->command_timeout, buffer, sizeof(buffer)); | |
1120 | outblock.authenticating = FALSE; | |
1121 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", | |
1122 | au->name, rc); | |
1123 | ||
1124 | /* A temporary authentication failure must hold up delivery to | |
1125 | this host. After a permanent authentication failure, we carry on | |
1126 | to try other authentication methods. If all fail hard, try to | |
1127 | deliver the message unauthenticated unless require_auth was set. */ | |
1128 | ||
1129 | switch(rc) | |
1130 | { | |
1131 | case OK: | |
1132 | smtp_authenticated = TRUE; /* stops the outer loop */ | |
1133 | break; | |
1134 | ||
1135 | /* Failure after writing a command */ | |
1136 | ||
1137 | case FAIL_SEND: | |
1138 | goto SEND_FAILED; | |
1139 | ||
1140 | /* Failure after reading a response */ | |
1141 | ||
1142 | case FAIL: | |
1143 | if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED; | |
1144 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", | |
1145 | au->name, host->name, host->address, buffer); | |
1146 | break; | |
1147 | ||
1148 | /* Failure by some other means. In effect, the authenticator | |
1149 | decided it wasn't prepared to handle this case. Typically this | |
1150 | is the result of "fail" in an expansion string. Do we need to | |
1151 | log anything here? */ | |
1152 | ||
1153 | case CANCELLED: | |
1154 | break; | |
1155 | ||
1156 | /* Internal problem, message in buffer. */ | |
1157 | ||
1158 | case ERROR: | |
1159 | yield = ERROR; | |
1160 | set_errno(addrlist, 0, string_copy(buffer), DEFER); | |
1161 | goto SEND_QUIT; | |
1162 | } | |
1163 | ||
1164 | break; /* If not authenticated, try next authenticator */ | |
1165 | } /* Loop for scanning supported server mechanisms */ | |
1166 | } /* Loop for further authenticators */ | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | /* If we haven't authenticated, but are required to, give up. */ | |
1171 | ||
1172 | if (require_auth == OK && !smtp_authenticated) | |
1173 | { | |
1174 | yield = DEFER; | |
1175 | set_errno(addrlist, ERRNO_AUTHFAIL, | |
1176 | string_sprintf("authentication required but %s", fail_reason), DEFER); | |
1177 | goto SEND_QUIT; | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | /* The setting up of the SMTP call is now complete. Any subsequent errors are | |
1182 | message-specific. */ | |
1183 | ||
1184 | setting_up = FALSE; | |
1185 | ||
1186 | /* If there is a filter command specified for this transport, we can now | |
1187 | set it up. This cannot be done until the identify of the host is known. */ | |
1188 | ||
1189 | if (tblock->filter_command != NULL) | |
1190 | { | |
1191 | BOOL rc; | |
1192 | uschar buffer[64]; | |
1193 | sprintf(CS buffer, "%.50s transport", tblock->name); | |
1194 | rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command, | |
1195 | TRUE, DEFER, addrlist, buffer, NULL); | |
1196 | ||
1197 | /* On failure, copy the error to all addresses, abandon the SMTP call, and | |
1198 | yield ERROR. */ | |
1199 | ||
1200 | if (!rc) | |
1201 | { | |
1202 | set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER); | |
1203 | yield = ERROR; | |
1204 | goto SEND_QUIT; | |
1205 | } | |
1206 | } | |
1207 | ||
1208 | ||
1209 | /* For messages that have more than the maximum number of envelope recipients, | |
1210 | we want to send several transactions down the same SMTP connection. (See | |
1211 | comments in deliver.c as to how this reconciles, heuristically, with | |
1212 | remote_max_parallel.) This optimization was added to Exim after the following | |
1213 | code was already working. The simplest way to put it in without disturbing the | |
1214 | code was to use a goto to jump back to this point when there is another | |
1215 | transaction to handle. */ | |
1216 | ||
1217 | SEND_MESSAGE: | |
1218 | sync_addr = first_addr; | |
1219 | address_count = 0; | |
1220 | ok = FALSE; | |
1221 | send_rset = TRUE; | |
1222 | completed_address = FALSE; | |
1223 | ||
1224 | ||
1225 | /* Initiate a message transfer. If we know the receiving MTA supports the SIZE | |
1226 | qualification, send it, adding something to the message size to allow for | |
1227 | imprecision and things that get added en route. Exim keeps the number of lines | |
1228 | in a message, so we can give an accurate value for the original message, but we | |
1229 | need some additional to handle added headers. (Double "." characters don't get | |
1230 | included in the count.) */ | |
1231 | ||
1232 | p = buffer; | |
1233 | *p = 0; | |
1234 | ||
1235 | if (smtp_use_size) | |
1236 | { | |
1237 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition); | |
1238 | while (*p) p++; | |
1239 | } | |
1240 | ||
1241 | /* Add the authenticated sender address if present */ | |
1242 | ||
1243 | if (smtp_authenticated && local_authenticated_sender != NULL) | |
1244 | { | |
1245 | string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s", | |
1246 | auth_xtextencode(local_authenticated_sender, | |
1247 | Ustrlen(local_authenticated_sender))); | |
1248 | } | |
1249 | ||
1250 | /* From here until we send the DATA command, we can make use of PIPELINING | |
1251 | if the server host supports it. The code has to be able to check the responses | |
1252 | at any point, for when the buffer fills up, so we write it totally generally. | |
1253 | When PIPELINING is off, each command written reports that it has flushed the | |
1254 | buffer. */ | |
1255 | ||
1256 | pending_MAIL = TRUE; /* The block starts with MAIL */ | |
1257 | ||
1258 | rc = smtp_write_command(&outblock, smtp_use_pipelining, | |
1259 | "MAIL FROM:<%s>%s\r\n", return_path, buffer); | |
1260 | mail_command = string_copy(big_buffer); /* Save for later error message */ | |
1261 | ||
1262 | switch(rc) | |
1263 | { | |
1264 | case -1: /* Transmission error */ | |
1265 | goto SEND_FAILED; | |
1266 | ||
1267 | case +1: /* Block was sent */ | |
1268 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1269 | ob->command_timeout)) goto RESPONSE_FAILED; | |
1270 | pending_MAIL = FALSE; | |
1271 | break; | |
1272 | } | |
1273 | ||
1274 | /* Pass over all the relevant recipient addresses for this host, which are the | |
1275 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send | |
1276 | several before we have to read the responses for those seen so far. This | |
1277 | checking is done by a subroutine because it also needs to be done at the end. | |
1278 | Send only up to max_rcpt addresses at a time, leaving first_addr pointing to | |
1279 | the next one if not all are sent. | |
1280 | ||
1281 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the | |
1282 | last address because we want to abort if any recipients have any kind of | |
1283 | problem, temporary or permanent. We know that all recipient addresses will have | |
1284 | the PENDING_DEFER status, because only one attempt is ever made, and we know | |
1285 | that max_rcpt will be large, so all addresses will be done at once. */ | |
1286 | ||
1287 | for (addr = first_addr; | |
1288 | address_count < max_rcpt && addr != NULL; | |
1289 | addr = addr->next) | |
1290 | { | |
1291 | int count; | |
1292 | BOOL no_flush; | |
1293 | ||
1294 | if (addr->transport_return != PENDING_DEFER) continue; | |
1295 | ||
1296 | address_count++; | |
1297 | no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL); | |
1298 | ||
1299 | /* Now send the RCPT command, and process outstanding responses when | |
1300 | necessary. After a timeout on RCPT, we just end the function, leaving the | |
1301 | yield as OK, because this error can often mean that there is a problem with | |
1302 | just one address, so we don't want to delay the host. */ | |
1303 | ||
1304 | count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>\r\n", | |
1305 | transport_rcpt_address(addr, tblock->rcpt_include_affixes)); | |
1306 | if (count < 0) goto SEND_FAILED; | |
1307 | if (count > 0) | |
1308 | { | |
1309 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, | |
1310 | &sync_addr, host, count, pending_MAIL, 0, &inblock, | |
1311 | ob->command_timeout, buffer, sizeof(buffer))) | |
1312 | { | |
1313 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
1314 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
1315 | break; | |
1316 | ||
1317 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
1318 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
1319 | case 0: /* No 2xx or 5xx, but no probs */ | |
1320 | break; | |
1321 | ||
1322 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
1323 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */ | |
1324 | } | |
1325 | pending_MAIL = FALSE; /* Dealt with MAIL */ | |
1326 | } | |
1327 | } /* Loop for next address */ | |
1328 | ||
1329 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either | |
1330 | permanently or temporarily. We should have flushed and synced after the last | |
1331 | RCPT. */ | |
1332 | ||
1333 | if (mua_wrapper) | |
1334 | { | |
1335 | address_item *badaddr; | |
1336 | for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next) | |
1337 | { | |
1338 | if (badaddr->transport_return != PENDING_OK) break; | |
1339 | } | |
1340 | if (badaddr != NULL) | |
1341 | { | |
1342 | set_errno(addrlist, 0, badaddr->message, FAIL); | |
1343 | ok = FALSE; | |
1344 | } | |
1345 | } | |
1346 | ||
1347 | /* If ok is TRUE, we know we have got at least one good recipient, and must now | |
1348 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still | |
1349 | have a good recipient buffered up if we are pipelining. We don't want to waste | |
1350 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we | |
1351 | are pipelining. The responses are all handled by sync_responses(). */ | |
1352 | ||
1353 | if (ok || (smtp_use_pipelining && !mua_wrapper)) | |
1354 | { | |
1355 | int count = smtp_write_command(&outblock, FALSE, "DATA\r\n"); | |
1356 | if (count < 0) goto SEND_FAILED; | |
1357 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr, | |
1358 | host, count, pending_MAIL, ok? +1 : -1, &inblock, | |
1359 | ob->command_timeout, buffer, sizeof(buffer))) | |
1360 | { | |
1361 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
1362 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
1363 | break; | |
1364 | ||
1365 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
1366 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
1367 | case 0: break; /* No 2xx or 5xx, but no probs */ | |
1368 | ||
1369 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
1370 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ | |
1371 | } | |
1372 | } | |
1373 | ||
1374 | /* Save the first address of the next batch. */ | |
1375 | ||
1376 | first_addr = addr; | |
1377 | ||
1378 | /* If there were no good recipients (but otherwise there have been no | |
1379 | problems), just set ok TRUE, since we have handled address-specific errors | |
1380 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism | |
1381 | for handling the SMTP dot-handling protocol, flagging to apply to headers as | |
1382 | well as body. Set the appropriate timeout value to be used for each chunk. | |
1383 | (Haven't been able to make it work using select() for writing yet.) */ | |
1384 | ||
1385 | if (!ok) ok = TRUE; else | |
1386 | { | |
1387 | sigalrm_seen = FALSE; | |
1388 | transport_write_timeout = ob->data_timeout; | |
1389 | smtp_command = US"sending data block"; /* For error messages */ | |
1390 | DEBUG(D_transport|D_v) | |
1391 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); | |
1392 | transport_count = 0; | |
1393 | ok = transport_write_message(addrlist, inblock.sock, | |
1394 | topt_use_crlf | topt_end_dot | topt_escape_headers | | |
1395 | (tblock->body_only? topt_no_headers : 0) | | |
1396 | (tblock->headers_only? topt_no_body : 0) | | |
1397 | (tblock->return_path_add? topt_add_return_path : 0) | | |
1398 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
1399 | (tblock->envelope_to_add? topt_add_envelope_to : 0), | |
1400 | 0, /* No size limit */ | |
1401 | tblock->add_headers, tblock->remove_headers, | |
1402 | US".", US"..", /* Escaping strings */ | |
1403 | tblock->rewrite_rules, tblock->rewrite_existflags); | |
1404 | ||
1405 | /* transport_write_message() uses write() because it is called from other | |
1406 | places to write to non-sockets. This means that under some OS (e.g. Solaris) | |
1407 | it can exit with "Broken pipe" as its error. This really means that the | |
1408 | socket got closed at the far end. */ | |
1409 | ||
1410 | transport_write_timeout = 0; /* for subsequent transports */ | |
1411 | ||
1412 | /* Failure can either be some kind of I/O disaster (including timeout), | |
1413 | or the failure of a transport filter or the expansion of added headers. */ | |
1414 | ||
1415 | if (!ok) | |
1416 | { | |
1417 | buffer[0] = 0; /* There hasn't been a response */ | |
1418 | goto RESPONSE_FAILED; | |
1419 | } | |
1420 | ||
1421 | /* We used to send the terminating "." explicitly here, but because of | |
1422 | buffering effects at both ends of TCP/IP connections, you don't gain | |
1423 | anything by keeping it separate, so it might as well go in the final | |
1424 | data buffer for efficiency. This is now done by setting the topt_end_dot | |
1425 | flag above. */ | |
1426 | ||
1427 | smtp_command = US"end of data"; | |
1428 | ||
1429 | /* For SMTP, we now read a single response that applies to the whole message. | |
1430 | If it is OK, then all the addresses have been delivered. */ | |
1431 | ||
1432 | if (!lmtp) ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1433 | ob->final_timeout); | |
1434 | ||
1435 | /* For LMTP, we get back a response for every RCPT command that we sent; | |
1436 | some may be accepted and some rejected. For those that get a response, their | |
1437 | status is fixed; any that are accepted have been handed over, even if later | |
1438 | responses crash - at least, that's how I read RFC 2033. | |
1439 | ||
1440 | If all went well, mark the recipient addresses as completed, record which | |
1441 | host/IPaddress they were delivered to, and cut out RSET when sending another | |
1442 | message down the same channel. Write the completed addresses to the journal | |
1443 | now so that they are recorded in case there is a crash of hardware or | |
1444 | software before the spool gets updated. Also record the final SMTP | |
1445 | confirmation if needed (for SMTP only). */ | |
1446 | ||
1447 | if (ok) | |
1448 | { | |
1449 | int flag = '='; | |
1450 | int delivery_time = (int)(time(NULL) - start_delivery_time); | |
1451 | int len; | |
1452 | host_item *thost; | |
1453 | uschar *conf = NULL; | |
1454 | send_rset = FALSE; | |
1455 | ||
1456 | /* Make a copy of the host if it is local to this invocation | |
1457 | of the transport. */ | |
1458 | ||
1459 | if (copy_host) | |
1460 | { | |
1461 | thost = store_get(sizeof(host_item)); | |
1462 | *thost = *host; | |
1463 | thost->name = string_copy(host->name); | |
1464 | thost->address = string_copy(host->address); | |
1465 | } | |
1466 | else thost = host; | |
1467 | ||
1468 | /* Set up confirmation if needed - applies only to SMTP */ | |
1469 | ||
1470 | if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp) | |
1471 | { | |
1472 | uschar *s = string_printing(buffer); | |
1473 | conf = (s == buffer)? (uschar *)string_copy(s) : s; | |
1474 | } | |
1475 | ||
1476 | /* Process all transported addresses - for LMTP, read a status for | |
1477 | each one. */ | |
1478 | ||
1479 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
1480 | { | |
1481 | if (addr->transport_return != PENDING_OK) continue; | |
1482 | ||
1483 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the | |
1484 | remaining addresses. Otherwise, it's a return code for just the one | |
1485 | address. */ | |
1486 | ||
1487 | if (lmtp) | |
1488 | { | |
1489 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1490 | ob->final_timeout)) | |
1491 | { | |
1492 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; | |
1493 | addr->message = string_sprintf("LMTP error after %s: %s", | |
1494 | big_buffer, string_printing(buffer)); | |
1495 | addr->transport_return = (buffer[0] == '5')? FAIL : DEFER; | |
1496 | continue; | |
1497 | } | |
1498 | completed_address = TRUE; /* NOW we can set this flag */ | |
1499 | } | |
1500 | ||
1501 | /* SMTP, or success return from LMTP for this address. Pass back the | |
1502 | actual port used. */ | |
1503 | ||
1504 | addr->transport_return = OK; | |
1505 | addr->more_errno = delivery_time; | |
1506 | thost->port = port; | |
1507 | addr->host_used = thost; | |
1508 | addr->special_action = flag; | |
1509 | addr->message = conf; | |
1510 | flag = '-'; | |
1511 | ||
1512 | /* Update the journal. For homonymic addresses, use the base address plus | |
1513 | the transport name. See lots of comments in deliver.c about the reasons | |
1514 | for the complications when homonyms are involved. Just carry on after | |
1515 | write error, as it may prove possible to update the spool file later. */ | |
1516 | ||
1517 | if (testflag(addr, af_homonym)) | |
1518 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); | |
1519 | else | |
1520 | sprintf(CS buffer, "%.500s\n", addr->unique); | |
1521 | ||
1522 | DEBUG(D_deliver) debug_printf("journalling %s", buffer); | |
1523 | len = Ustrlen(CS buffer); | |
1524 | if (write(journal_fd, buffer, len) != len) | |
1525 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " | |
1526 | "%s: %s", buffer, strerror(errno)); | |
1527 | } | |
1528 | ||
1529 | /* Ensure the journal file is pushed out to disk. */ | |
1530 | ||
1531 | if (fsync(journal_fd) < 0) | |
1532 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", | |
1533 | strerror(errno)); | |
1534 | } | |
1535 | } | |
1536 | ||
1537 | ||
1538 | /* Handle general (not specific to one address) failures here. The value of ok | |
1539 | is used to skip over this code on the falling through case. A timeout causes a | |
1540 | deferral. Other errors may defer or fail according to the response code, and | |
1541 | may set up a special errno value, e.g. after connection chopped, which is | |
1542 | assumed if errno == 0 and there is no text in the buffer. If control reaches | |
1543 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as | |
1544 | the problem is not related to this specific message. */ | |
1545 | ||
1546 | if (!ok) | |
1547 | { | |
1548 | int code; | |
1549 | ||
1550 | RESPONSE_FAILED: | |
1551 | save_errno = errno; | |
1552 | message = NULL; | |
1553 | send_quit = check_response(host, &save_errno, addrlist->more_errno, | |
1554 | buffer, &code, &message); | |
1555 | goto FAILED; | |
1556 | ||
1557 | SEND_FAILED: | |
1558 | save_errno = errno; | |
1559 | code = '4'; | |
1560 | message = US string_sprintf("send() to %s [%s] failed: %s", | |
1561 | host->name, host->address, strerror(save_errno)); | |
1562 | send_quit = FALSE; | |
1563 | goto FAILED; | |
1564 | ||
1565 | /* This label is jumped to directly when a TLS negotiation has failed, | |
1566 | or was not done for a host for which it is required. Values will be set | |
1567 | in message and save_errno, and setting_up will always be true. Treat as | |
1568 | a temporary error. */ | |
1569 | ||
1570 | #ifdef SUPPORT_TLS | |
1571 | TLS_FAILED: | |
1572 | code = '4'; | |
1573 | #endif | |
1574 | ||
1575 | /* If the failure happened while setting up the call, see if the failure was | |
1576 | a 5xx response (this will either be on connection, or following HELO - a 5xx | |
1577 | after EHLO causes it to try HELO). If so, fail all addresses, as this host is | |
1578 | never going to accept them. For other errors during setting up (timeouts or | |
1579 | whatever), defer all addresses, and yield DEFER, so that the host is not | |
1580 | tried again for a while. */ | |
1581 | ||
1582 | FAILED: | |
1583 | ok = FALSE; /* For when reached by GOTO */ | |
1584 | ||
1585 | if (setting_up) | |
1586 | { | |
1587 | if (code == '5') | |
1588 | { | |
1589 | set_errno(addrlist, save_errno, message, FAIL); | |
1590 | } | |
1591 | else | |
1592 | { | |
1593 | set_errno(addrlist, save_errno, message, DEFER); | |
1594 | yield = DEFER; | |
1595 | } | |
1596 | } | |
1597 | ||
1598 | /* If there was an I/O error or timeout or other transportation error, | |
1599 | indicated by errno being non-zero, defer all addresses and yield DEFER, | |
1600 | except for the case of failed add_headers expansion, or a transport filter | |
1601 | failure, when the yield should be ERROR, to stop it trying other hosts. | |
1602 | ||
1603 | However, handle timeouts after MAIL FROM or "." and loss of connection after | |
1604 | "." specially. They can indicate a problem with the sender address or with | |
1605 | the contents of the message rather than a real error on the connection. | |
1606 | Therefore, treat these cases in the same way as a 4xx response. | |
1607 | ||
1608 | The following condition tests for NOT these special cases. */ | |
1609 | ||
1610 | else if (save_errno != 0 && | |
1611 | (save_errno != ETIMEDOUT || | |
1612 | (Ustrncmp(smtp_command,"MAIL",4) != 0 && | |
1613 | Ustrncmp(smtp_command,"end ",4) != 0)) && | |
1614 | (save_errno != ERRNO_SMTPCLOSED || | |
1615 | Ustrncmp(smtp_command,"end ",4) != 0)) | |
1616 | { | |
1617 | yield = (save_errno == ERRNO_CHHEADER_FAIL || | |
1618 | save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER; | |
1619 | set_errno(addrlist, save_errno, message, DEFER); | |
1620 | } | |
1621 | ||
1622 | /* Otherwise we have a message-specific error response from the remote | |
1623 | host. This is one of | |
1624 | (a) negative response or timeout after "mail from" | |
1625 | (b) negative response after "data" | |
1626 | (c) negative response or timeout or dropped connection after "." | |
1627 | It won't be a negative response or timeout after "rcpt to", as that is dealt | |
1628 | with separately above. The action in all cases is to set an appropriate | |
1629 | error code for all the addresses, but to leave yield set to OK because | |
1630 | the host itself has not failed. [It might in practice have failed for a | |
1631 | timeout after MAIL FROM, or "." but if so, we'll discover that at the next | |
1632 | delivery attempt.] For a temporary error, set the message_defer flag, and | |
1633 | write to the logs for information if this is not the last host. The error for | |
1634 | the last host will be logged as part of the address's log line. */ | |
1635 | ||
1636 | else | |
1637 | { | |
1638 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ | |
1639 | ||
1640 | set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER); | |
1641 | ||
1642 | /* If there's an errno, the message contains just the identity of | |
1643 | the host. */ | |
1644 | ||
1645 | if (code != '5') /* Anything other than 5 is treated as temporary */ | |
1646 | { | |
1647 | if (save_errno > 0) | |
1648 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); | |
1649 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message); | |
1650 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); | |
1651 | *message_defer = TRUE; | |
1652 | } | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | ||
1657 | /* If all has gone well, send_quit will be set TRUE, implying we can end the | |
1658 | SMTP session tidily. However, if there were too many addresses to send in one | |
1659 | message (indicated by first_addr being non-NULL) we want to carry on with the | |
1660 | rest of them. Also, it is desirable to send more than one message down the SMTP | |
1661 | connection if there are several waiting, provided we haven't already sent so | |
1662 | many as to hit the configured limit. The function transport_check_waiting looks | |
1663 | for a waiting message and returns its id. Then transport_pass_socket tries to | |
1664 | set up a continued delivery by passing the socket on to another process. The | |
1665 | variable send_rset is FALSE if a message has just been successfully transfered. | |
1666 | ||
1667 | If we are already sending down a continued channel, there may be further | |
1668 | addresses not yet delivered that are aimed at the same host, but which have not | |
1669 | been passed in this run of the transport. In this case, continue_more will be | |
1670 | true, and all we should do is send RSET if necessary, and return, leaving the | |
1671 | channel open. | |
1672 | ||
1673 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we | |
1674 | do not want to continue with other messages down the same channel, because that | |
1675 | can lead to looping between two or more messages, all with the same, | |
1676 | temporarily failing address(es). [The retry information isn't updated yet, so | |
1677 | new processes keep on trying.] We probably also don't want to try more of this | |
1678 | message's addresses either. | |
1679 | ||
1680 | If we have started a TLS session, we have to end it before passing the | |
1681 | connection to a new process. However, not all servers can handle this (Exim | |
1682 | can), so we do not pass such a connection on if the host matches | |
1683 | hosts_nopass_tls. */ | |
1684 | ||
1685 | DEBUG(D_transport) | |
1686 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " | |
1687 | "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset, | |
1688 | continue_more, yield, (first_addr == NULL)? "":"not "); | |
1689 | ||
1690 | if (completed_address && ok && send_quit) | |
1691 | { | |
1692 | BOOL more; | |
1693 | if (first_addr != NULL || continue_more || | |
1694 | ( | |
1695 | (tls_active < 0 || | |
1696 | verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name, | |
1697 | host->address, NULL) != OK) | |
1698 | && | |
1699 | transport_check_waiting(tblock->name, host->name, | |
1700 | tblock->connection_max_messages, new_message_id, &more) | |
1701 | )) | |
1702 | { | |
1703 | uschar *msg; | |
1704 | ||
1705 | if (send_rset) | |
1706 | { | |
1707 | if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0)) | |
1708 | { | |
1709 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, | |
1710 | host->address, strerror(save_errno)); | |
1711 | send_quit = FALSE; | |
1712 | } | |
1713 | else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1714 | ob->command_timeout))) | |
1715 | { | |
1716 | int code; | |
1717 | send_quit = check_response(host, &errno, 0, buffer, &code, &msg); | |
1718 | if (!send_quit) | |
1719 | { | |
1720 | DEBUG(D_transport) debug_printf("%s\n", msg); | |
1721 | } | |
1722 | } | |
1723 | } | |
1724 | ||
1725 | /* Either RSET was not needed, or it succeeded */ | |
1726 | ||
1727 | if (ok) | |
1728 | { | |
1729 | if (first_addr != NULL) /* More addresses still to be sent */ | |
1730 | { /* in this run of the transport */ | |
1731 | continue_sequence++; /* Causes * in logging */ | |
1732 | goto SEND_MESSAGE; | |
1733 | } | |
1734 | if (continue_more) return yield; /* More addresses for another run */ | |
1735 | ||
1736 | /* Pass the socket to a new Exim process. Before doing so, we must shut | |
1737 | down TLS. Not all MTAs allow for the continuation of the SMTP session | |
1738 | when TLS is shut down. We test for this by sending a new EHLO. If we | |
1739 | don't get a good response, we don't attempt to pass the socket on. */ | |
1740 | ||
1741 | #ifdef SUPPORT_TLS | |
1742 | if (tls_active >= 0) | |
1743 | { | |
1744 | tls_close(TRUE); | |
1745 | ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 && | |
1746 | smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1747 | ob->command_timeout); | |
1748 | } | |
1749 | #endif | |
1750 | ||
1751 | /* If the socket is successfully passed, we musn't send QUIT (or | |
1752 | indeed anything!) from here. */ | |
1753 | ||
1754 | if (ok && transport_pass_socket(tblock->name, host->name, host->address, | |
1755 | new_message_id, inblock.sock)) | |
1756 | { | |
1757 | send_quit = FALSE; | |
1758 | } | |
1759 | } | |
1760 | ||
1761 | /* If RSET failed and there are addresses left, they get deferred. */ | |
1762 | ||
1763 | else set_errno(first_addr, errno, msg, DEFER); | |
1764 | } | |
1765 | } | |
1766 | ||
1767 | /* End off tidily with QUIT unless the connection has died or the socket has | |
1768 | been passed to another process. There has been discussion on the net about what | |
1769 | to do after sending QUIT. The wording of the RFC suggests that it is necessary | |
1770 | to wait for a response, but on the other hand, there isn't anything one can do | |
1771 | with an error response, other than log it. Exim used to do that. However, | |
1772 | further discussion suggested that it is positively advantageous not to wait for | |
1773 | the response, but to close the session immediately. This is supposed to move | |
1774 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some | |
1775 | load from the server. (Hosts that are both servers and clients may not see much | |
1776 | difference, of course.) Further discussion indicated that this was safe to do | |
1777 | on Unix systems which have decent implementations of TCP/IP that leave the | |
1778 | connection around for a while (TIME_WAIT) after the application has gone away. | |
1779 | This enables the response sent by the server to be properly ACKed rather than | |
1780 | timed out, as can happen on broken TCP/IP implementations on other OS. | |
1781 | ||
1782 | This change is being made on 31-Jul-98. After over a year of trouble-free | |
1783 | operation, the old commented-out code was removed on 17-Sep-99. */ | |
1784 | ||
1785 | SEND_QUIT: | |
1786 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
1787 | ||
1788 | END_OFF: | |
1789 | ||
1790 | #ifdef SUPPORT_TLS | |
1791 | tls_close(TRUE); | |
1792 | #endif | |
1793 | ||
1794 | /* Close the socket, and return the appropriate value, first setting | |
1795 | continue_transport and continue_hostname NULL to prevent any other addresses | |
1796 | that may include the host from trying to re-use a continuation socket. This | |
1797 | works because the NULL setting is passed back to the calling process, and | |
1798 | remote_max_parallel is forced to 1 when delivering over an existing connection, | |
1799 | ||
1800 | If all went well and continue_more is set, we shouldn't actually get here if | |
1801 | there are further addresses, as the return above will be taken. However, | |
1802 | writing RSET might have failed, or there may be other addresses whose hosts are | |
1803 | specified in the transports, and therefore not visible at top level, in which | |
1804 | case continue_more won't get set. */ | |
1805 | ||
1806 | close(inblock.sock); | |
1807 | continue_transport = NULL; | |
1808 | continue_hostname = NULL; | |
1809 | return yield; | |
1810 | } | |
1811 | ||
1812 | ||
1813 | ||
1814 | ||
1815 | /************************************************* | |
1816 | * Closedown entry point * | |
1817 | *************************************************/ | |
1818 | ||
1819 | /* This function is called when exim is passed an open smtp channel | |
1820 | from another incarnation, but the message which it has been asked | |
1821 | to deliver no longer exists. The channel is on stdin. | |
1822 | ||
1823 | We might do fancy things like looking for another message to send down | |
1824 | the channel, but if the one we sought has gone, it has probably been | |
1825 | delivered by some other process that itself will seek further messages, | |
1826 | so just close down our connection. | |
1827 | ||
1828 | Argument: pointer to the transport instance block | |
1829 | Returns: nothing | |
1830 | */ | |
1831 | ||
1832 | void | |
1833 | smtp_transport_closedown(transport_instance *tblock) | |
1834 | { | |
1835 | smtp_transport_options_block *ob = | |
1836 | (smtp_transport_options_block *)(tblock->options_block); | |
1837 | smtp_inblock inblock; | |
1838 | smtp_outblock outblock; | |
1839 | uschar buffer[256]; | |
1840 | uschar inbuffer[4096]; | |
1841 | uschar outbuffer[16]; | |
1842 | ||
1843 | inblock.sock = fileno(stdin); | |
1844 | inblock.buffer = inbuffer; | |
1845 | inblock.buffersize = sizeof(inbuffer); | |
1846 | inblock.ptr = inbuffer; | |
1847 | inblock.ptrend = inbuffer; | |
1848 | ||
1849 | outblock.sock = inblock.sock; | |
1850 | outblock.buffersize = sizeof(outbuffer); | |
1851 | outblock.buffer = outbuffer; | |
1852 | outblock.ptr = outbuffer; | |
1853 | outblock.cmd_count = 0; | |
1854 | outblock.authenticating = FALSE; | |
1855 | ||
1856 | (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
1857 | (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1858 | ob->command_timeout); | |
1859 | close(inblock.sock); | |
1860 | } | |
1861 | ||
1862 | ||
1863 | ||
1864 | /************************************************* | |
1865 | * Prepare addresses for delivery * | |
1866 | *************************************************/ | |
1867 | ||
1868 | /* This function is called to flush out error settings from previous delivery | |
1869 | attempts to other hosts. It also records whether we got here via an MX record | |
1870 | or not in the more_errno field of the address. We are interested only in | |
1871 | addresses that are still marked DEFER - others may have got delivered to a | |
1872 | previously considered IP address. Set their status to PENDING_DEFER to indicate | |
1873 | which ones are relevant this time. | |
1874 | ||
1875 | Arguments: | |
1876 | addrlist the list of addresses | |
1877 | host the host we are delivering to | |
1878 | ||
1879 | Returns: the first address for this delivery | |
1880 | */ | |
1881 | ||
1882 | static address_item * | |
1883 | prepare_addresses(address_item *addrlist, host_item *host) | |
1884 | { | |
1885 | address_item *first_addr = NULL; | |
1886 | address_item *addr; | |
1887 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
1888 | { | |
1889 | if (addr->transport_return != DEFER) continue; | |
1890 | if (first_addr == NULL) first_addr = addr; | |
1891 | addr->transport_return = PENDING_DEFER; | |
1892 | addr->basic_errno = 0; | |
1893 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; | |
1894 | addr->message = NULL; | |
1895 | #ifdef SUPPORT_TLS | |
1896 | addr->cipher = NULL; | |
1897 | addr->peerdn = NULL; | |
1898 | #endif | |
1899 | } | |
1900 | return first_addr; | |
1901 | } | |
1902 | ||
1903 | ||
1904 | ||
1905 | /************************************************* | |
1906 | * Main entry point * | |
1907 | *************************************************/ | |
1908 | ||
1909 | /* See local README for interface details. As this is a remote transport, it is | |
1910 | given a chain of addresses to be delivered in one connection, if possible. It | |
1911 | always returns TRUE, indicating that each address has its own independent | |
1912 | status set, except if there is a setting up problem, in which case it returns | |
1913 | FALSE. */ | |
1914 | ||
1915 | BOOL | |
1916 | smtp_transport_entry( | |
1917 | transport_instance *tblock, /* data for this instantiation */ | |
1918 | address_item *addrlist) /* addresses we are working on */ | |
1919 | { | |
1920 | int cutoff_retry; | |
1921 | int port; | |
1922 | int hosts_defer = 0; | |
1923 | int hosts_fail = 0; | |
1924 | int hosts_looked_up = 0; | |
1925 | int hosts_retry = 0; | |
1926 | int hosts_serial = 0; | |
1927 | int hosts_total = 0; | |
1928 | address_item *addr; | |
1929 | BOOL expired = TRUE; | |
1930 | BOOL continuing = continue_hostname != NULL; | |
1931 | uschar *expanded_hosts = NULL; | |
1932 | uschar *pistring; | |
1933 | uschar *tid = string_sprintf("%s transport", tblock->name); | |
1934 | smtp_transport_options_block *ob = | |
1935 | (smtp_transport_options_block *)(tblock->options_block); | |
1936 | host_item *hostlist = addrlist->host_list; | |
1937 | host_item *host = NULL; | |
1938 | ||
1939 | DEBUG(D_transport) | |
1940 | { | |
1941 | debug_printf("%s transport entered\n", tblock->name); | |
1942 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
1943 | debug_printf(" %s\n", addr->address); | |
1944 | if (continuing) debug_printf("already connected to %s [%s]\n", | |
1945 | continue_hostname, continue_host_address); | |
1946 | } | |
1947 | ||
1948 | /* If a host list is not defined for the addresses - they must all have the | |
1949 | same one in order to be passed to a single transport - or if the transport has | |
1950 | a host list with hosts_override set, use the host list supplied with the | |
1951 | transport. It is an error for this not to exist. */ | |
1952 | ||
1953 | if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL)) | |
1954 | { | |
1955 | if (ob->hosts == NULL) | |
1956 | { | |
1957 | addrlist->message = string_sprintf("%s transport called with no hosts set", | |
1958 | tblock->name); | |
1959 | addrlist->transport_return = PANIC; | |
1960 | return FALSE; /* Only top address has status */ | |
1961 | } | |
1962 | ||
1963 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", | |
1964 | ob->hosts); | |
1965 | ||
1966 | /* If the transport's host list contains no '$' characters, and we are not | |
1967 | randomizing, it is fixed and therefore a chain of hosts can be built once | |
1968 | and for all, and remembered for subsequent use by other calls to this | |
1969 | transport. If, on the other hand, the host list does contain '$', or we are | |
1970 | randomizing its order, we have to rebuild it each time. In the fixed case, | |
1971 | as the hosts string will never be used again, it doesn't matter that we | |
1972 | replace all the : characters with zeros. */ | |
1973 | ||
1974 | if (ob->hostlist == NULL) | |
1975 | { | |
1976 | uschar *s = ob->hosts; | |
1977 | ||
1978 | if (Ustrchr(s, '$') != NULL) | |
1979 | { | |
1980 | expanded_hosts = expand_string(s); | |
1981 | if (expanded_hosts == NULL) | |
1982 | { | |
1983 | addrlist->message = string_sprintf("failed to expand list of hosts " | |
1984 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); | |
1985 | addrlist->transport_return = search_find_defer? DEFER : PANIC; | |
1986 | return FALSE; /* Only top address has status */ | |
1987 | } | |
1988 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " | |
1989 | "\"%s\"\n", s, expanded_hosts); | |
1990 | s = expanded_hosts; | |
1991 | } | |
1992 | else | |
1993 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); | |
1994 | ||
1995 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); | |
1996 | ||
1997 | /* If there was no expansion of hosts, save the host list for | |
1998 | next time. */ | |
1999 | ||
2000 | if (expanded_hosts == NULL) ob->hostlist = hostlist; | |
2001 | } | |
2002 | ||
2003 | /* This is not the first time this transport has been run in this delivery; | |
2004 | the host list was built previously. */ | |
2005 | ||
2006 | else hostlist = ob->hostlist; | |
2007 | } | |
2008 | ||
2009 | /* The host list was supplied with the address. If hosts_randomize is set, we | |
2010 | must sort it into a random order if it did not come from MX records and has not | |
2011 | already been randomized (but don't bother if continuing down an existing | |
2012 | connection). */ | |
2013 | ||
2014 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing) | |
2015 | { | |
2016 | host_item *newlist = NULL; | |
2017 | while (hostlist != NULL) | |
2018 | { | |
2019 | host_item *h = hostlist; | |
2020 | hostlist = hostlist->next; | |
2021 | ||
2022 | h->sort_key = random_number(100); | |
2023 | ||
2024 | if (newlist == NULL) | |
2025 | { | |
2026 | h->next = NULL; | |
2027 | newlist = h; | |
2028 | } | |
2029 | else if (h->sort_key < newlist->sort_key) | |
2030 | { | |
2031 | h->next = newlist; | |
2032 | newlist = h; | |
2033 | } | |
2034 | else | |
2035 | { | |
2036 | host_item *hh = newlist; | |
2037 | while (hh->next != NULL) | |
2038 | { | |
2039 | if (h->sort_key < hh->next->sort_key) break; | |
2040 | hh = hh->next; | |
2041 | } | |
2042 | h->next = hh->next; | |
2043 | hh->next = h; | |
2044 | } | |
2045 | } | |
2046 | ||
2047 | hostlist = addrlist->host_list = newlist; | |
2048 | } | |
2049 | ||
2050 | ||
2051 | /* Sort out the port. Set up a string for adding to the retry key if the port | |
2052 | number is not the standard SMTP port. */ | |
2053 | ||
2054 | if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE; | |
2055 | pistring = string_sprintf(":%d", port); | |
2056 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; | |
2057 | ||
2058 | ||
2059 | /* For each host-plus-IP-address on the list: | |
2060 | ||
2061 | . If this is a continued delivery and the host isn't the one with the | |
2062 | current connection, skip. | |
2063 | ||
2064 | . If the status is unusable (i.e. previously failed or retry checked), skip. | |
2065 | ||
2066 | . If no IP address set, get the address, either by turning the name into | |
2067 | an address, calling gethostbyname if gethostbyname is on, or by calling | |
2068 | the DNS. The DNS may yield multiple addresses, in which case insert the | |
2069 | extra ones into the list. | |
2070 | ||
2071 | . Get the retry data if not previously obtained for this address and set the | |
2072 | field which remembers the state of this address. Skip if the retry time is | |
2073 | not reached. If not, remember whether retry data was found. The retry string | |
2074 | contains both the name and the IP address. | |
2075 | ||
2076 | . Scan the list of addresses and mark those whose status is DEFER as | |
2077 | PENDING_DEFER. These are the only ones that will be processed in this cycle | |
2078 | of the hosts loop. | |
2079 | ||
2080 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. | |
2081 | Some addresses may be successfully delivered, others may fail, and yet | |
2082 | others may get temporary errors and so get marked DEFER. | |
2083 | ||
2084 | . The return from the delivery attempt is OK if a connection was made and a | |
2085 | valid SMTP dialogue was completed. Otherwise it is DEFER. | |
2086 | ||
2087 | . If OK, add a "remove" retry item for this host/IPaddress, if any. | |
2088 | ||
2089 | . If fail to connect, or other defer state, add a retry item. | |
2090 | ||
2091 | . If there are any addresses whose status is still DEFER, carry on to the | |
2092 | next host/IPaddress, unless we have tried the number of hosts given | |
2093 | by hosts_max_try; otherwise return. | |
2094 | ||
2095 | If we get to the end of the list, all hosts have deferred at least one address, | |
2096 | or not reached their retry times. If delay_after_cutoff is unset, it requests a | |
2097 | delivery attempt to those hosts whose last try was before the arrival time of | |
2098 | the current message. To cope with this, we have to go round the loop a second | |
2099 | time. After that, set the status and error data for any addresses that haven't | |
2100 | had it set already. */ | |
2101 | ||
2102 | for (cutoff_retry = 0; expired && | |
2103 | cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2); | |
2104 | cutoff_retry++) | |
2105 | { | |
2106 | host_item *nexthost = NULL; | |
2107 | int unexpired_hosts_tried = 0; | |
2108 | ||
2109 | for (host = hostlist; | |
2110 | host != NULL && unexpired_hosts_tried < ob->hosts_max_try; | |
2111 | host = nexthost) | |
2112 | { | |
2113 | int rc; | |
2114 | int host_af; | |
2115 | uschar *rs; | |
2116 | BOOL serialized = FALSE; | |
2117 | BOOL host_is_expired = FALSE; | |
2118 | BOOL message_defer = FALSE; | |
2119 | BOOL ifchanges = FALSE; | |
2120 | BOOL some_deferred = FALSE; | |
2121 | address_item *first_addr = NULL; | |
2122 | uschar *interface = NULL; | |
2123 | uschar *retry_host_key = NULL; | |
2124 | uschar *retry_message_key = NULL; | |
2125 | uschar *serialize_key = NULL; | |
2126 | ||
2127 | /* Default next host is next host. :-) But this can vary if the | |
2128 | hosts_max_try limit is hit (see below). */ | |
2129 | ||
2130 | nexthost = host->next; | |
2131 | ||
2132 | /* Set the flag requesting that this host be added to the waiting | |
2133 | database if the delivery fails temporarily or if we are running with | |
2134 | queue_smtp or a 2-stage queue run. This gets unset for certain | |
2135 | kinds of error, typically those that are specific to the message. */ | |
2136 | ||
2137 | host->update_waiting = TRUE; | |
2138 | ||
2139 | /* If the address hasn't yet been obtained from the host name, look it up | |
2140 | now, unless the host is already marked as unusable. If it is marked as | |
2141 | unusable, it means that the router was unable to find its IP address (in | |
2142 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and | |
2143 | the lookup failed last time. We don't get this far if *all* MX records | |
2144 | point to non-existent hosts; that is treated as a hard error. | |
2145 | ||
2146 | We can just skip this host entirely. When the hosts came from the router, | |
2147 | the address will timeout based on the other host(s); when the address is | |
2148 | looked up below, there is an explicit retry record added. | |
2149 | ||
2150 | Note that we mustn't skip unusable hosts if the address is not unset; they | |
2151 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ | |
2152 | ||
2153 | if (host->address == NULL) | |
2154 | { | |
2155 | uschar *canonical_name; | |
2156 | ||
2157 | if (host->status >= hstatus_unusable) | |
2158 | { | |
2159 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", | |
2160 | host->name); | |
2161 | continue; | |
2162 | } | |
2163 | ||
2164 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); | |
2165 | ||
2166 | hosts_looked_up++; | |
2167 | ||
2168 | /* Find by name if so configured, or if it's an IP address. We don't | |
2169 | just copy the IP address, because we need the test-for-local to happen. */ | |
2170 | ||
2171 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL)) | |
2172 | rc = host_find_byname(host, NULL, &canonical_name, TRUE); | |
2173 | else | |
2174 | { | |
2175 | int flags = HOST_FIND_BY_A; | |
2176 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
2177 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
2178 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, | |
2179 | &canonical_name, NULL); | |
2180 | } | |
2181 | ||
2182 | /* Failure to find the host at this time (usually DNS temporary failure) | |
2183 | is really a kind of routing failure rather than a transport failure. | |
2184 | Therefore we add a retry item of the routing kind, not to stop us trying | |
2185 | to look this name up here again, but to ensure the address gets timed | |
2186 | out if the failures go on long enough. A complete failure at this point | |
2187 | commonly points to a configuration error, but the best action is still | |
2188 | to carry on for the next host. */ | |
2189 | ||
2190 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED) | |
2191 | { | |
2192 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); | |
2193 | expired = FALSE; | |
2194 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; | |
2195 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? | |
2196 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); | |
2197 | host->status = hstatus_unusable; | |
2198 | ||
2199 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2200 | { | |
2201 | if (addr->transport_return != DEFER) continue; | |
2202 | addr->basic_errno = ERRNO_UNKNOWNHOST; | |
2203 | addr->message = | |
2204 | string_sprintf("failed to lookup IP address for %s", host->name); | |
2205 | } | |
2206 | continue; | |
2207 | } | |
2208 | ||
2209 | /* If the host is actually the local host, we may have a problem, or | |
2210 | there may be some cunning configuration going on. In the problem case, | |
2211 | log things and give up. The default transport status is already DEFER. */ | |
2212 | ||
2213 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) | |
2214 | { | |
2215 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2216 | { | |
2217 | addr->basic_errno = 0; | |
2218 | addr->message = string_sprintf("%s transport found host %s to be " | |
2219 | "local", tblock->name, host->name); | |
2220 | } | |
2221 | goto END_TRANSPORT; | |
2222 | } | |
2223 | } /* End of block for IP address lookup */ | |
2224 | ||
2225 | /* If this is a continued delivery, we are interested only in the host | |
2226 | which matches the name of the existing open channel. The check is put | |
2227 | here after the local host lookup, in case the name gets expanded as a | |
2228 | result of the lookup. Set expired FALSE, to save the outer loop executing | |
2229 | twice. */ | |
2230 | ||
2231 | if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 || | |
2232 | Ustrcmp(continue_host_address, host->address) != 0)) | |
2233 | { | |
2234 | expired = FALSE; | |
2235 | continue; /* With next host */ | |
2236 | } | |
2237 | ||
2238 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the | |
2239 | domain is in queue_smtp_domains, we don't actually want to attempt any | |
2240 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If | |
2241 | there is a lookup defer in queue_smtp_domains, proceed as if the domain | |
2242 | were not in it. We don't want to hold up all SMTP deliveries! Except when | |
2243 | doing a two-stage queue run, don't do this if forcing. */ | |
2244 | ||
2245 | if ((!deliver_force || queue_2stage) && (queue_smtp || | |
2246 | match_isinlist(addrlist->domain, &queue_smtp_domains, 0, NULL, NULL, | |
2247 | MCL_DOMAIN, TRUE, NULL) == OK)) | |
2248 | { | |
2249 | expired = FALSE; | |
2250 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2251 | { | |
2252 | if (addr->transport_return != DEFER) continue; | |
2253 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; | |
2254 | } | |
2255 | continue; /* With next host */ | |
2256 | } | |
2257 | ||
2258 | /* Count hosts being considered - purely for an intelligent comment | |
2259 | if none are usable. */ | |
2260 | ||
2261 | hosts_total++; | |
2262 | ||
2263 | /* Set $host and $host address now in case they are needed for the | |
2264 | interface expansion or the serialize_hosts check; they remain set if an | |
2265 | actual delivery happens. */ | |
2266 | ||
2267 | deliver_host = host->name; | |
2268 | deliver_host_address = host->address; | |
2269 | ||
2270 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface | |
2271 | string changes upon expansion, we must add it to the key that is used for | |
2272 | retries, because connections to the same host from a different interface | |
2273 | should be treated separately. */ | |
2274 | ||
2275 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6; | |
2276 | if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges, | |
2277 | &interface, tid)) | |
2278 | return FALSE; | |
2279 | if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface); | |
2280 | ||
2281 | /* The first time round the outer loop, check the status of the host by | |
2282 | inspecting the retry data. The second time round, we are interested only | |
2283 | in expired hosts that haven't been tried since this message arrived. */ | |
2284 | ||
2285 | if (cutoff_retry == 0) | |
2286 | { | |
2287 | /* Ensure the status of the address is set by checking retry data if | |
2288 | necessary. There maybe host-specific retry data (applicable to all | |
2289 | messages) and also data for retries of a specific message at this host. | |
2290 | If either of these retry records are actually read, the keys used are | |
2291 | returned to save recomputing them later. */ | |
2292 | ||
2293 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, | |
2294 | ob->retry_include_ip_address, &retry_host_key, &retry_message_key); | |
2295 | ||
2296 | DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name, | |
2297 | (host->address == NULL)? US"" : host->address, pistring, | |
2298 | (host->status == hstatus_usable)? "usable" : | |
2299 | (host->status == hstatus_unusable)? "unusable" : | |
2300 | (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?"); | |
2301 | ||
2302 | /* Skip this address if not usable at this time, noting if it wasn't | |
2303 | actually expired, both locally and in the address. */ | |
2304 | ||
2305 | switch (host->status) | |
2306 | { | |
2307 | case hstatus_unusable: | |
2308 | expired = FALSE; | |
2309 | setflag(addrlist, af_retry_skipped); | |
2310 | /* Fall through */ | |
2311 | ||
2312 | case hstatus_unusable_expired: | |
2313 | switch (host->why) | |
2314 | { | |
2315 | case hwhy_retry: hosts_retry++; break; | |
2316 | case hwhy_failed: hosts_fail++; break; | |
2317 | case hwhy_deferred: hosts_defer++; break; | |
2318 | } | |
2319 | ||
2320 | /* If there was a retry message key, implying that previously there | |
2321 | was a message-specific defer, we don't want to update the list of | |
2322 | messages waiting for this host. */ | |
2323 | ||
2324 | if (retry_message_key != NULL) host->update_waiting = FALSE; | |
2325 | continue; /* With the next host or IP address */ | |
2326 | } | |
2327 | } | |
2328 | ||
2329 | /* Second time round the loop: if the address is set but expired, and | |
2330 | the message is newer than the last try, let it through. */ | |
2331 | ||
2332 | else | |
2333 | { | |
2334 | if (host->address == NULL || | |
2335 | host->status != hstatus_unusable_expired || | |
2336 | host->last_try > received_time) | |
2337 | continue; | |
2338 | DEBUG(D_transport) | |
2339 | debug_printf("trying expired host %s [%s]%s\n", | |
2340 | host->name, host->address, pistring); | |
2341 | host_is_expired = TRUE; | |
2342 | } | |
2343 | ||
2344 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; | |
2345 | it remains TRUE only if all hosts are expired and none are actually tried. | |
2346 | */ | |
2347 | ||
2348 | expired = FALSE; | |
2349 | ||
2350 | /* If this host is listed as one to which access must be serialized, | |
2351 | see if another Exim process has a connection to it, and if so, skip | |
2352 | this host. If not, update the database to record our connection to it | |
2353 | and remember this for later deletion. Do not do any of this if we are | |
2354 | sending the message down a pre-existing connection. */ | |
2355 | ||
2356 | if (!continuing && | |
2357 | verify_check_this_host(&(ob->serialize_hosts), NULL, host->name, | |
2358 | host->address, NULL) == OK) | |
2359 | { | |
2360 | serialize_key = string_sprintf("host-serialize-%s", host->name); | |
2361 | if (!enq_start(serialize_key)) | |
2362 | { | |
2363 | DEBUG(D_transport) | |
2364 | debug_printf("skipping host %s because another Exim process " | |
2365 | "is connected to it\n", host->name); | |
2366 | hosts_serial++; | |
2367 | continue; | |
2368 | } | |
2369 | serialized = TRUE; | |
2370 | } | |
2371 | ||
2372 | /* OK, we have an IP address that is not waiting for its retry time to | |
2373 | arrive (it might be expired) OR (second time round the loop) we have an | |
2374 | expired host that hasn't been tried since the message arrived. Have a go | |
2375 | at delivering the message to it. First prepare the addresses by flushing | |
2376 | out the result of previous attempts, and finding the first address that | |
2377 | is still to be delivered. */ | |
2378 | ||
2379 | first_addr = prepare_addresses(addrlist, host); | |
2380 | ||
2381 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", | |
2382 | message_id, host->name, host->address, addrlist->address, | |
2383 | (addrlist->next == NULL)? "" : ", ..."); | |
2384 | ||
2385 | set_process_info("delivering %s to %s [%s] (%s%s)", | |
2386 | message_id, host->name, host->address, addrlist->address, | |
2387 | (addrlist->next == NULL)? "" : ", ..."); | |
2388 | ||
2389 | /* This is not for real; don't do the delivery. If there are | |
2390 | any remaining hosts, list them. */ | |
2391 | ||
2392 | if (dont_deliver) | |
2393 | { | |
2394 | host_item *host2; | |
2395 | set_errno(addrlist, 0, NULL, OK); | |
2396 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2397 | { | |
2398 | addr->host_used = host; | |
2399 | addr->special_action = '*'; | |
2400 | addr->message = US"delivery bypassed by -N option"; | |
2401 | } | |
2402 | DEBUG(D_transport) | |
2403 | { | |
2404 | debug_printf("*** delivery by %s transport bypassed by -N option\n" | |
2405 | "*** host and remaining hosts:\n", tblock->name); | |
2406 | for (host2 = host; host2 != NULL; host2 = host2->next) | |
2407 | debug_printf(" %s [%s]\n", host2->name, | |
2408 | (host2->address == NULL)? US"unset" : host2->address); | |
2409 | } | |
2410 | rc = OK; | |
2411 | } | |
2412 | ||
2413 | /* This is for real. If the host is expired, we don't count it for | |
2414 | hosts_max_retry. This ensures that all hosts must expire before an address | |
2415 | is timed out. Otherwise, if we are about to hit the hosts_max_retry limit, | |
2416 | check to see if there is a subsequent hosts with a different MX value. If | |
2417 | so, make that the next host, and don't count this one. This is a heuristic | |
2418 | to make sure that different MXs do get tried. With a normal kind of retry | |
2419 | rule, they would get tried anyway when the earlier hosts were delayed, but | |
2420 | if the domain has a "retry every time" type of rule - as is often used for | |
2421 | the the very large ISPs, that won't happen. */ | |
2422 | ||
2423 | else | |
2424 | { | |
2425 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) | |
2426 | { | |
2427 | host_item *h; | |
2428 | DEBUG(D_transport) | |
2429 | debug_printf("hosts_max_try limit reached with this host\n"); | |
2430 | for (h = host; h != NULL; h = h->next) | |
2431 | if (h->mx != host->mx) break; | |
2432 | if (h != NULL) | |
2433 | { | |
2434 | nexthost = h; | |
2435 | unexpired_hosts_tried--; | |
2436 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " | |
2437 | "and will be tried\n"); | |
2438 | } | |
2439 | } | |
2440 | ||
2441 | /* Attempt the delivery. */ | |
2442 | ||
2443 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, | |
2444 | expanded_hosts != NULL, &message_defer, FALSE); | |
2445 | ||
2446 | /* Yield is one of: | |
2447 | OK => connection made, each address contains its result; | |
2448 | message_defer is set for message-specific defers (when all | |
2449 | recipients are marked defer) | |
2450 | DEFER => there was a non-message-specific delivery problem; | |
2451 | ERROR => there was a problem setting up the arguments for a filter, | |
2452 | or there was a problem with expanding added headers | |
2453 | */ | |
2454 | ||
2455 | /* If the result is not OK, there was a non-message-specific problem. | |
2456 | If the result is DEFER, we need to write to the logs saying what happened | |
2457 | for this particular host, except in the case of authentication and TLS | |
2458 | failures, where the log has already been written. If all hosts defer a | |
2459 | general message is written at the end. */ | |
2460 | ||
2461 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL && | |
2462 | first_addr->basic_errno != ERRNO_TLSFAILURE) | |
2463 | write_logs(first_addr, host); | |
2464 | ||
2465 | /* If STARTTLS was accepted, but there was a failure in setting up the | |
2466 | TLS session (usually a certificate screwup), and the host is not in | |
2467 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with | |
2468 | TLS forcibly turned off. We have to start from scratch with a new SMTP | |
2469 | connection. That's why the retry is done from here, not from within | |
2470 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the | |
2471 | session, so the in-clear transmission after those errors, if permitted, | |
2472 | happens inside smtp_deliver().] */ | |
2473 | ||
2474 | #ifdef SUPPORT_TLS | |
2475 | if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE && | |
2476 | ob->tls_tempfail_tryclear && | |
2477 | verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, | |
2478 | host->address, NULL) != OK) | |
2479 | { | |
2480 | log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted " | |
2481 | "to %s [%s] (not in hosts_require_tls)", host->name, host->address); | |
2482 | first_addr = prepare_addresses(addrlist, host); | |
2483 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, | |
2484 | expanded_hosts != NULL, &message_defer, TRUE); | |
2485 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) | |
2486 | write_logs(first_addr, host); | |
2487 | } | |
2488 | #endif | |
2489 | } | |
2490 | ||
2491 | /* Delivery attempt finished */ | |
2492 | ||
2493 | rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)? | |
2494 | US"ERROR" : US"?"; | |
2495 | ||
2496 | set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s", | |
2497 | message_id, host->name, host->address, addrlist->address, | |
2498 | (addrlist->next == NULL)? "" : " (& others)", rs); | |
2499 | ||
2500 | /* Release serialization if set up */ | |
2501 | ||
2502 | if (serialized) enq_end(serialize_key); | |
2503 | ||
2504 | /* If the result is DEFER, or if a host retry record is known to exist, we | |
2505 | need to add an item to the retry chain for updating the retry database | |
2506 | at the end of delivery. We only need to add the item to the top address, | |
2507 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it | |
2508 | for any other delivery attempts using the same address. (It is copied into | |
2509 | the unusable tree at the outer level, so even if different address blocks | |
2510 | contain the same address, it still won't get tried again.) */ | |
2511 | ||
2512 | if (rc == DEFER || retry_host_key != NULL) | |
2513 | { | |
2514 | int delete_flag = (rc != DEFER)? rf_delete : 0; | |
2515 | if (retry_host_key == NULL) | |
2516 | { | |
2517 | retry_host_key = ob->retry_include_ip_address? | |
2518 | string_sprintf("T:%S:%s%s", host->name, host->address, pistring) : | |
2519 | string_sprintf("T:%S%s", host->name, pistring); | |
2520 | } | |
2521 | ||
2522 | /* If a delivery of another message over an existing SMTP connection | |
2523 | yields DEFER, we do NOT set up retry data for the host. This covers the | |
2524 | case when there are delays in routing the addresses in the second message | |
2525 | that are so long that the server times out. This is alleviated by not | |
2526 | routing addresses that previously had routing defers when handling an | |
2527 | existing connection, but even so, this case may occur (e.g. if a | |
2528 | previously happily routed address starts giving routing defers). If the | |
2529 | host is genuinely down, another non-continued message delivery will | |
2530 | notice it soon enough. */ | |
2531 | ||
2532 | if (delete_flag != 0 || !continuing) | |
2533 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); | |
2534 | ||
2535 | /* We may have tried an expired host, if its retry time has come; ensure | |
2536 | the status reflects the expiry for the benefit of any other addresses. */ | |
2537 | ||
2538 | if (rc == DEFER) | |
2539 | { | |
2540 | host->status = (host_is_expired)? | |
2541 | hstatus_unusable_expired : hstatus_unusable; | |
2542 | host->why = hwhy_deferred; | |
2543 | } | |
2544 | } | |
2545 | ||
2546 | /* If message_defer is set (host was OK, but every recipient got deferred | |
2547 | because of some message-specific problem), or if that had happened | |
2548 | previously so that a message retry key exists, add an appropriate item | |
2549 | to the retry chain. Note that if there was a message defer but now there is | |
2550 | a host defer, the message defer record gets deleted. That seems perfectly | |
2551 | reasonable. Also, stop the message from being remembered as waiting | |
2552 | for this host. */ | |
2553 | ||
2554 | if (message_defer || retry_message_key != NULL) | |
2555 | { | |
2556 | int delete_flag = message_defer? 0 : rf_delete; | |
2557 | if (retry_message_key == NULL) | |
2558 | { | |
2559 | retry_message_key = ob->retry_include_ip_address? | |
2560 | string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, | |
2561 | message_id) : | |
2562 | string_sprintf("T:%S%s:%s", host->name, pistring, message_id); | |
2563 | } | |
2564 | retry_add_item(addrlist, retry_message_key, | |
2565 | rf_message | rf_host | delete_flag); | |
2566 | host->update_waiting = FALSE; | |
2567 | } | |
2568 | ||
2569 | /* Any return other than DEFER (that is, OK or ERROR) means that the | |
2570 | addresses have got their final statuses filled in for this host. In the OK | |
2571 | case, see if any of them are deferred. */ | |
2572 | ||
2573 | if (rc == OK) | |
2574 | { | |
2575 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2576 | { | |
2577 | if (addr->transport_return == DEFER) | |
2578 | { | |
2579 | some_deferred = TRUE; | |
2580 | break; | |
2581 | } | |
2582 | } | |
2583 | } | |
2584 | ||
2585 | /* If no addresses deferred or the result was ERROR, return. We do this for | |
2586 | ERROR because a failing filter set-up or add_headers expansion is likely to | |
2587 | fail for any host we try. */ | |
2588 | ||
2589 | if (rc == ERROR || (rc == OK && !some_deferred)) | |
2590 | { | |
2591 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
2592 | return TRUE; /* Each address has its status */ | |
2593 | } | |
2594 | ||
2595 | /* If the result was DEFER or some individual addresses deferred, let | |
2596 | the loop run to try other hosts with the deferred addresses, except for the | |
2597 | case when we were trying to deliver down an existing channel and failed. | |
2598 | Don't try any other hosts in this case. */ | |
2599 | ||
2600 | if (continuing) break; | |
2601 | ||
2602 | /* If the whole delivery, or some individual addresses, were deferred and | |
2603 | there are more hosts that could be tried, do not count this host towards | |
2604 | the hosts_max_try limit if the age of the message is greater than the | |
2605 | maximum retry time for this host. This means we may try try all hosts, | |
2606 | ignoring the limit, when messages have been around for some time. This is | |
2607 | important because if we don't try all hosts, the address will never time | |
2608 | out. */ | |
2609 | ||
2610 | if ((rc == DEFER || some_deferred) && nexthost != NULL) | |
2611 | { | |
2612 | BOOL timedout; | |
2613 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); | |
2614 | ||
2615 | if (retry != NULL && retry->rules != NULL) | |
2616 | { | |
2617 | retry_rule *last_rule; | |
2618 | for (last_rule = retry->rules; | |
2619 | last_rule->next != NULL; | |
2620 | last_rule = last_rule->next); | |
2621 | timedout = time(NULL) - received_time > last_rule->timeout; | |
2622 | } | |
2623 | else timedout = TRUE; /* No rule => timed out */ | |
2624 | ||
2625 | if (timedout) | |
2626 | { | |
2627 | unexpired_hosts_tried--; | |
2628 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " | |
2629 | "hosts_max_try (message older than host's retry time)\n"); | |
2630 | } | |
2631 | } | |
2632 | } /* End of loop for trying multiple hosts. */ | |
2633 | ||
2634 | /* This is the end of the loop that repeats iff expired is TRUE and | |
2635 | ob->delay_after_cutoff is FALSE. The second time round we will | |
2636 | try those hosts that haven't been tried since the message arrived. */ | |
2637 | ||
2638 | DEBUG(D_transport) | |
2639 | { | |
2640 | debug_printf("all IP addresses skipped or deferred at least one address\n"); | |
2641 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) | |
2642 | debug_printf("retrying IP addresses not tried since message arrived\n"); | |
2643 | } | |
2644 | } | |
2645 | ||
2646 | ||
2647 | /* Get here if all IP addresses are skipped or defer at least one address. In | |
2648 | MUA wrapper mode, this will happen only for connection or other non-message- | |
2649 | specific failures. Force the delivery status for all addresses to FAIL. */ | |
2650 | ||
2651 | if (mua_wrapper) | |
2652 | { | |
2653 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2654 | addr->transport_return = FAIL; | |
2655 | goto END_TRANSPORT; | |
2656 | } | |
2657 | ||
2658 | /* In the normal, non-wrapper case, add a standard message to each deferred | |
2659 | address if there hasn't been an error, that is, if it hasn't actually been | |
2660 | tried this time. The variable "expired" will be FALSE if any deliveries were | |
2661 | actually tried, or if there was at least one host that was not expired. That | |
2662 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If | |
2663 | a delivery has been tried, an error code will be set, and the failing of the | |
2664 | message is handled by the retry code later. | |
2665 | ||
2666 | If queue_smtp is set, or this transport was called to send a subsequent message | |
2667 | down an existing TCP/IP connection, and something caused the host not to be | |
2668 | found, we end up here, but can detect these cases and handle them specially. */ | |
2669 | ||
2670 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2671 | { | |
2672 | /* If host is not NULL, it means that we stopped processing the host list | |
2673 | because of hosts_max_try. This means we need to behave as if some hosts were | |
2674 | skipped because their retry time had not come. Specifically, this prevents | |
2675 | the address from timing out. */ | |
2676 | ||
2677 | if (host != NULL) | |
2678 | { | |
2679 | DEBUG(D_transport) | |
2680 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); | |
2681 | setflag(addr, af_retry_skipped); | |
2682 | } | |
2683 | ||
2684 | if (queue_smtp) /* no deliveries attempted */ | |
2685 | { | |
2686 | addr->transport_return = DEFER; | |
2687 | addr->basic_errno = 0; | |
2688 | addr->message = US"SMTP delivery explicitly queued"; | |
2689 | } | |
2690 | ||
2691 | else if (addr->transport_return == DEFER && | |
2692 | (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) && | |
2693 | addr->message == NULL) | |
2694 | { | |
2695 | addr->basic_errno = ERRNO_HRETRY; | |
2696 | if (continue_hostname != NULL) | |
2697 | { | |
2698 | addr->message = US"no host found for existing SMTP connection"; | |
2699 | } | |
2700 | else if (expired) | |
2701 | { | |
2702 | addr->message = (ob->delay_after_cutoff)? | |
2703 | US"retry time not reached for any host after a long failure period" : | |
2704 | US"all hosts have been failing for a long time and were last tried " | |
2705 | "after this message arrived"; | |
2706 | ||
2707 | /* If we are already using fallback hosts, or there are no fallback hosts | |
2708 | defined, convert the result to FAIL to cause a bounce. */ | |
2709 | ||
2710 | if (addr->host_list == addr->fallback_hosts || | |
2711 | addr->fallback_hosts == NULL) | |
2712 | addr->transport_return = FAIL; | |
2713 | } | |
2714 | else | |
2715 | { | |
2716 | if (hosts_retry == hosts_total) | |
2717 | addr->message = US"retry time not reached for any host"; | |
2718 | else if (hosts_fail == hosts_total) | |
2719 | addr->message = US"all host address lookups failed permanently"; | |
2720 | else if (hosts_defer == hosts_total) | |
2721 | addr->message = US"all host address lookups failed temporarily"; | |
2722 | else if (hosts_serial == hosts_total) | |
2723 | addr->message = US"connection limit reached for all hosts"; | |
2724 | else if (hosts_fail+hosts_defer == hosts_total) | |
2725 | addr->message = US"all host address lookups failed"; | |
2726 | else addr->message = US"some host address lookups failed and retry time " | |
2727 | "not reached for other hosts or connection limit reached"; | |
2728 | } | |
2729 | } | |
2730 | } | |
2731 | ||
2732 | /* Update the database which keeps information about which messages are waiting | |
2733 | for which hosts to become available. Each host in the list has a flag which is | |
2734 | set if the data is to be updated. For some message-specific errors, the flag is | |
2735 | turned off because we don't want follow-on deliveries in those cases. */ | |
2736 | ||
2737 | transport_update_waiting(hostlist, tblock->name); | |
2738 | ||
2739 | END_TRANSPORT: | |
2740 | ||
2741 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
2742 | ||
2743 | return TRUE; /* Each address has its status */ | |
2744 | } | |
2745 | ||
2746 | /* End of transport/smtp.c */ |