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533244af | 1 | /* $Cambridge: exim/src/src/transports/smtp.c,v 1.4 2005/01/04 16:36:28 ph10 Exp $ */ |
0756eb3c PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
c988f1f4 | 7 | /* Copyright (c) University of Cambridge 1995 - 2005 */ |
0756eb3c PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | #include "../exim.h" | |
11 | #include "smtp.h" | |
12 | ||
13 | #define PENDING 256 | |
14 | #define PENDING_DEFER (PENDING + DEFER) | |
15 | #define PENDING_OK (PENDING + OK) | |
16 | ||
17 | ||
18 | /* Options specific to the smtp transport. This transport also supports LMTP | |
19 | over TCP/IP. The options must be in alphabetic order (note that "_" comes | |
20 | before the lower case letters). Some live in the transport_instance block so as | |
21 | to be publicly visible; these are flagged with opt_public. */ | |
22 | ||
23 | optionlist smtp_transport_options[] = { | |
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) }, | |
533244af PH |
60 | { "hosts_max_try_hardlimit", opt_int, |
61 | (void *)offsetof(smtp_transport_options_block, hosts_max_try_hardlimit) }, | |
0756eb3c PH |
62 | #ifdef SUPPORT_TLS |
63 | { "hosts_nopass_tls", opt_stringptr, | |
64 | (void *)offsetof(smtp_transport_options_block, hosts_nopass_tls) }, | |
65 | #endif | |
66 | { "hosts_override", opt_bool, | |
67 | (void *)offsetof(smtp_transport_options_block, hosts_override) }, | |
68 | { "hosts_randomize", opt_bool, | |
69 | (void *)offsetof(smtp_transport_options_block, hosts_randomize) }, | |
70 | { "hosts_require_auth", opt_stringptr, | |
71 | (void *)offsetof(smtp_transport_options_block, hosts_require_auth) }, | |
72 | #ifdef SUPPORT_TLS | |
73 | { "hosts_require_tls", opt_stringptr, | |
74 | (void *)offsetof(smtp_transport_options_block, hosts_require_tls) }, | |
75 | #endif | |
76 | { "hosts_try_auth", opt_stringptr, | |
77 | (void *)offsetof(smtp_transport_options_block, hosts_try_auth) }, | |
78 | { "interface", opt_stringptr, | |
79 | (void *)offsetof(smtp_transport_options_block, interface) }, | |
80 | { "keepalive", opt_bool, | |
81 | (void *)offsetof(smtp_transport_options_block, keepalive) }, | |
82 | { "max_rcpt", opt_int | opt_public, | |
83 | (void *)offsetof(transport_instance, max_addresses) }, | |
84 | { "multi_domain", opt_bool | opt_public, | |
85 | (void *)offsetof(transport_instance, multi_domain) }, | |
86 | { "port", opt_stringptr, | |
87 | (void *)offsetof(smtp_transport_options_block, port) }, | |
88 | { "protocol", opt_stringptr, | |
89 | (void *)offsetof(smtp_transport_options_block, protocol) }, | |
90 | { "retry_include_ip_address", opt_bool, | |
91 | (void *)offsetof(smtp_transport_options_block, retry_include_ip_address) }, | |
92 | { "serialize_hosts", opt_stringptr, | |
93 | (void *)offsetof(smtp_transport_options_block, serialize_hosts) }, | |
94 | { "size_addition", opt_int, | |
95 | (void *)offsetof(smtp_transport_options_block, size_addition) } | |
96 | #ifdef SUPPORT_TLS | |
97 | ,{ "tls_certificate", opt_stringptr, | |
98 | (void *)offsetof(smtp_transport_options_block, tls_certificate) }, | |
99 | { "tls_crl", opt_stringptr, | |
100 | (void *)offsetof(smtp_transport_options_block, tls_crl) }, | |
101 | { "tls_privatekey", opt_stringptr, | |
102 | (void *)offsetof(smtp_transport_options_block, tls_privatekey) }, | |
103 | { "tls_require_ciphers", opt_stringptr, | |
104 | (void *)offsetof(smtp_transport_options_block, tls_require_ciphers) }, | |
105 | { "tls_tempfail_tryclear", opt_bool, | |
106 | (void *)offsetof(smtp_transport_options_block, tls_tempfail_tryclear) }, | |
107 | { "tls_verify_certificates", opt_stringptr, | |
108 | (void *)offsetof(smtp_transport_options_block, tls_verify_certificates) } | |
109 | #endif | |
110 | }; | |
111 | ||
112 | /* Size of the options list. An extern variable has to be used so that its | |
113 | address can appear in the tables drtables.c. */ | |
114 | ||
115 | int smtp_transport_options_count = | |
116 | sizeof(smtp_transport_options)/sizeof(optionlist); | |
117 | ||
118 | /* Default private options block for the smtp transport. */ | |
119 | ||
120 | smtp_transport_options_block smtp_transport_option_defaults = { | |
121 | NULL, /* hosts */ | |
122 | NULL, /* fallback_hosts */ | |
123 | NULL, /* hostlist */ | |
124 | NULL, /* fallback_hostlist */ | |
125 | NULL, /* authenticated_sender */ | |
126 | US"$primary_hostname", /* helo_data */ | |
127 | NULL, /* interface */ | |
128 | NULL, /* port */ | |
129 | US"smtp", /* protocol */ | |
130 | NULL, /* serialize_hosts */ | |
131 | NULL, /* hosts_try_auth */ | |
132 | NULL, /* hosts_require_auth */ | |
133 | NULL, /* hosts_require_tls */ | |
134 | NULL, /* hosts_avoid_tls */ | |
135 | NULL, /* hosts_avoid_esmtp */ | |
136 | NULL, /* hosts_nopass_tls */ | |
137 | 5*60, /* command_timeout */ | |
138 | 5*60, /* connect_timeout; shorter system default overrides */ | |
139 | 5*60, /* data timeout */ | |
140 | 10*60, /* final timeout */ | |
141 | 1024, /* size_addition */ | |
142 | 5, /* hosts_max_try */ | |
533244af | 143 | 50, /* hosts_max_try_hardlimit */ |
0756eb3c PH |
144 | FALSE, /* allow_localhost */ |
145 | FALSE, /* gethostbyname */ | |
146 | TRUE, /* dns_qualify_single */ | |
147 | FALSE, /* dns_search_parents */ | |
148 | TRUE, /* delay_after_cutoff */ | |
149 | FALSE, /* hosts_override */ | |
150 | FALSE, /* hosts_randomize */ | |
151 | TRUE, /* keepalive */ | |
152 | TRUE /* retry_include_ip_address */ | |
153 | #ifdef SUPPORT_TLS | |
154 | ,NULL, /* tls_certificate */ | |
155 | NULL, /* tls_crl */ | |
156 | NULL, /* tls_privatekey */ | |
157 | NULL, /* tls_require_ciphers */ | |
158 | NULL, /* tls_verify_certificates */ | |
159 | TRUE /* tls_tempfail_tryclear */ | |
160 | #endif | |
161 | }; | |
162 | ||
163 | ||
164 | /* Local statics */ | |
165 | ||
166 | static uschar *smtp_command; /* Points to last cmd for error messages */ | |
167 | static uschar *mail_command; /* Points to MAIL cmd for error messages */ | |
168 | ||
169 | ||
170 | /************************************************* | |
171 | * Setup entry point * | |
172 | *************************************************/ | |
173 | ||
174 | /* This function is called when the transport is about to be used, | |
175 | but before running it in a sub-process. It is used for two things: | |
176 | ||
177 | (1) To set the fallback host list in addresses, when delivering. | |
178 | (2) To pass back the interface, port, and protocol options, for use during | |
179 | callout verification. | |
180 | ||
181 | Arguments: | |
182 | tblock pointer to the transport instance block | |
183 | addrlist list of addresses about to be transported | |
184 | tf if not NULL, pointer to block in which to return options | |
185 | errmsg place for error message (not used) | |
186 | ||
187 | Returns: OK always (FAIL, DEFER not used) | |
188 | */ | |
189 | ||
190 | static int | |
191 | smtp_transport_setup(transport_instance *tblock, address_item *addrlist, | |
192 | transport_feedback *tf, uschar **errmsg) | |
193 | { | |
194 | smtp_transport_options_block *ob = | |
195 | (smtp_transport_options_block *)(tblock->options_block); | |
196 | ||
197 | errmsg = errmsg; /* Keep picky compilers happy */ | |
198 | ||
199 | /* Pass back options if required. This interface is getting very messy. */ | |
200 | ||
201 | if (tf != NULL) | |
202 | { | |
203 | tf->interface = ob->interface; | |
204 | tf->port = ob->port; | |
205 | tf->protocol = ob->protocol; | |
206 | tf->hosts = ob->hosts; | |
207 | tf->hosts_override = ob->hosts_override; | |
208 | tf->hosts_randomize = ob->hosts_randomize; | |
209 | tf->gethostbyname = ob->gethostbyname; | |
210 | tf->qualify_single = ob->dns_qualify_single; | |
211 | tf->search_parents = ob->dns_search_parents; | |
212 | } | |
213 | ||
214 | /* Set the fallback host list for all the addresses that don't have fallback | |
215 | host lists, provided that the local host wasn't present in the original host | |
216 | list. */ | |
217 | ||
218 | if (!testflag(addrlist, af_local_host_removed)) | |
219 | { | |
220 | for (; addrlist != NULL; addrlist = addrlist->next) | |
221 | if (addrlist->fallback_hosts == NULL) | |
222 | addrlist->fallback_hosts = ob->fallback_hostlist; | |
223 | } | |
224 | ||
225 | return OK; | |
226 | } | |
227 | ||
228 | ||
229 | ||
230 | /************************************************* | |
231 | * Initialization entry point * | |
232 | *************************************************/ | |
233 | ||
234 | /* Called for each instance, after its options have been read, to | |
235 | enable consistency checks to be done, or anything else that needs | |
236 | to be set up. | |
237 | ||
238 | Argument: pointer to the transport instance block | |
239 | Returns: nothing | |
240 | */ | |
241 | ||
242 | void | |
243 | smtp_transport_init(transport_instance *tblock) | |
244 | { | |
245 | smtp_transport_options_block *ob = | |
246 | (smtp_transport_options_block *)(tblock->options_block); | |
247 | ||
248 | /* Retry_use_local_part defaults FALSE if unset */ | |
249 | ||
250 | if (tblock->retry_use_local_part == TRUE_UNSET) | |
251 | tblock->retry_use_local_part = FALSE; | |
252 | ||
253 | /* Set the default port according to the protocol */ | |
254 | ||
255 | if (ob->port == NULL) | |
256 | ob->port = (strcmpic(ob->protocol, US"lmtp") == 0)? US"lmtp" : US"smtp"; | |
257 | ||
258 | /* Set up the setup entry point, to be called before subprocesses for this | |
259 | transport. */ | |
260 | ||
261 | tblock->setup = smtp_transport_setup; | |
262 | ||
263 | /* Complain if any of the timeouts are zero. */ | |
264 | ||
265 | if (ob->command_timeout <= 0 || ob->data_timeout <= 0 || | |
266 | ob->final_timeout <= 0) | |
267 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
268 | "command, data, or final timeout value is zero for %s transport", | |
269 | tblock->name); | |
270 | ||
271 | /* If hosts_override is set and there are local hosts, set the global | |
272 | flag that stops verify from showing router hosts. */ | |
273 | ||
274 | if (ob->hosts_override && ob->hosts != NULL) tblock->overrides_hosts = TRUE; | |
275 | ||
276 | /* If there are any fallback hosts listed, build a chain of host items | |
277 | for them, but do not do any lookups at this time. */ | |
278 | ||
279 | host_build_hostlist(&(ob->fallback_hostlist), ob->fallback_hosts, FALSE); | |
280 | } | |
281 | ||
282 | ||
283 | ||
284 | ||
285 | ||
286 | /************************************************* | |
287 | * Set delivery info into all active addresses * | |
288 | *************************************************/ | |
289 | ||
290 | /* Only addresses whose status is >= PENDING are relevant. A lesser | |
291 | status means that an address is not currently being processed. | |
292 | ||
293 | Arguments: | |
294 | addrlist points to a chain of addresses | |
295 | errno_value to put in each address's errno field | |
296 | msg to put in each address's message field | |
297 | rc to put in each address's transport_return field | |
298 | ||
299 | If errno_value has the special value ERRNO_CONNECTTIMEOUT, ETIMEDOUT is put in | |
300 | the errno field, and RTEF_CTOUT is ORed into the more_errno field, to indicate | |
301 | this particular type of timeout. | |
302 | ||
303 | Returns: nothing | |
304 | */ | |
305 | ||
306 | static | |
307 | void set_errno(address_item *addrlist, int errno_value, uschar *msg, int rc) | |
308 | { | |
309 | address_item *addr; | |
310 | int orvalue = 0; | |
311 | if (errno_value == ERRNO_CONNECTTIMEOUT) | |
312 | { | |
313 | errno_value = ETIMEDOUT; | |
314 | orvalue = RTEF_CTOUT; | |
315 | } | |
316 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
317 | { | |
318 | if (addr->transport_return < PENDING) continue; | |
319 | addr->basic_errno = errno_value; | |
320 | addr->more_errno |= orvalue; | |
321 | if (msg != NULL) addr->message = msg; | |
322 | addr->transport_return = rc; | |
323 | } | |
324 | } | |
325 | ||
326 | ||
327 | ||
328 | /************************************************* | |
329 | * Check an SMTP response * | |
330 | *************************************************/ | |
331 | ||
332 | /* This function is given an errno code and the SMTP response buffer | |
333 | to analyse, together with the host identification for generating messages. It | |
334 | sets an appropriate message and puts the first digit of the response code into | |
335 | the yield variable. If no response was actually read, a suitable digit is | |
336 | chosen. | |
337 | ||
338 | Arguments: | |
339 | host the current host, to get its name for messages | |
340 | errno_value pointer to the errno value | |
341 | more_errno from the top address for use with ERRNO_FILTER_FAIL | |
342 | buffer the SMTP response buffer | |
343 | yield where to put a one-digit SMTP response code | |
344 | message where to put an errror message | |
345 | ||
346 | Returns: TRUE if an SMTP "QUIT" command should be sent, else FALSE | |
347 | */ | |
348 | ||
349 | static BOOL check_response(host_item *host, int *errno_value, int more_errno, | |
350 | uschar *buffer, int *yield, uschar **message) | |
351 | { | |
352 | uschar *pl = US""; | |
353 | ||
354 | if (smtp_use_pipelining && | |
355 | (Ustrcmp(smtp_command, "MAIL") == 0 || | |
356 | Ustrcmp(smtp_command, "RCPT") == 0 || | |
357 | Ustrcmp(smtp_command, "DATA") == 0)) | |
358 | pl = US"pipelined "; | |
359 | ||
360 | *yield = '4'; /* Default setting is to give a temporary error */ | |
361 | ||
362 | /* Handle response timeout */ | |
363 | ||
364 | if (*errno_value == ETIMEDOUT) | |
365 | { | |
366 | *message = US string_sprintf("SMTP timeout while connected to %s [%s] " | |
367 | "after %s%s", host->name, host->address, pl, smtp_command); | |
368 | if (transport_count > 0) | |
369 | *message = US string_sprintf("%s (%d bytes written)", *message, | |
370 | transport_count); | |
371 | return FALSE; | |
372 | } | |
373 | ||
374 | /* Handle malformed SMTP response */ | |
375 | ||
376 | if (*errno_value == ERRNO_SMTPFORMAT) | |
377 | { | |
378 | uschar *malfresp = string_printing(buffer); | |
379 | while (isspace(*malfresp)) malfresp++; | |
380 | if (*malfresp == 0) | |
381 | *message = string_sprintf("Malformed SMTP reply (an empty line) from " | |
382 | "%s [%s] in response to %s%s", host->name, host->address, pl, | |
383 | smtp_command); | |
384 | else | |
385 | *message = string_sprintf("Malformed SMTP reply from %s [%s] in response " | |
386 | "to %s%s: %s", host->name, host->address, pl, smtp_command, malfresp); | |
387 | return FALSE; | |
388 | } | |
389 | ||
390 | /* Handle a failed filter process error; can't send QUIT as we mustn't | |
391 | end the DATA. */ | |
392 | ||
393 | if (*errno_value == ERRNO_FILTER_FAIL) | |
394 | { | |
35af9f61 PH |
395 | *message = US string_sprintf("transport filter process failed (%d)%s", |
396 | more_errno, | |
397 | (more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); | |
0756eb3c PH |
398 | return FALSE; |
399 | } | |
400 | ||
401 | /* Handle a failed add_headers expansion; can't send QUIT as we mustn't | |
402 | end the DATA. */ | |
403 | ||
404 | if (*errno_value == ERRNO_CHHEADER_FAIL) | |
405 | { | |
406 | *message = | |
407 | US string_sprintf("failed to expand headers_add or headers_remove: %s", | |
408 | expand_string_message); | |
409 | return FALSE; | |
410 | } | |
411 | ||
412 | /* Handle failure to write a complete data block */ | |
413 | ||
414 | if (*errno_value == ERRNO_WRITEINCOMPLETE) | |
415 | { | |
416 | *message = US string_sprintf("failed to write a data block"); | |
417 | return FALSE; | |
418 | } | |
419 | ||
420 | /* Handle error responses from the remote mailer. */ | |
421 | ||
422 | if (buffer[0] != 0) | |
423 | { | |
424 | uschar *s = string_printing(buffer); | |
425 | *message = US string_sprintf("SMTP error from remote mailer after %s%s: " | |
426 | "host %s [%s]: %s", pl, smtp_command, host->name, host->address, s); | |
427 | *yield = buffer[0]; | |
428 | return TRUE; | |
429 | } | |
430 | ||
431 | /* No data was read. If there is no errno, this must be the EOF (i.e. | |
432 | connection closed) case, which causes deferral. Otherwise, put the host's | |
433 | identity in the message, leaving the errno value to be interpreted as well. In | |
434 | all cases, we have to assume the connection is now dead. */ | |
435 | ||
436 | if (*errno_value == 0) | |
437 | { | |
438 | *errno_value = ERRNO_SMTPCLOSED; | |
439 | *message = US string_sprintf("Remote host %s [%s] closed connection " | |
440 | "in response to %s%s", host->name, host->address, pl, smtp_command); | |
441 | } | |
442 | else *message = US string_sprintf("%s [%s]", host->name, host->address); | |
443 | ||
444 | return FALSE; | |
445 | } | |
446 | ||
447 | ||
448 | ||
449 | /************************************************* | |
450 | * Write error message to logs * | |
451 | *************************************************/ | |
452 | ||
453 | /* This writes to the main log and to the message log. | |
454 | ||
455 | Arguments: | |
456 | addr the address item containing error information | |
457 | host the current host | |
458 | ||
459 | Returns: nothing | |
460 | */ | |
461 | ||
462 | static void | |
463 | write_logs(address_item *addr, host_item *host) | |
464 | { | |
465 | if (addr->message != NULL) | |
466 | { | |
467 | uschar *message = addr->message; | |
468 | if (addr->basic_errno > 0) | |
469 | message = string_sprintf("%s: %s", message, strerror(addr->basic_errno)); | |
470 | log_write(0, LOG_MAIN, "%s", message); | |
471 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); | |
472 | } | |
473 | else | |
474 | { | |
475 | log_write(0, LOG_MAIN, "%s [%s]: %s", | |
476 | host->name, | |
477 | host->address, | |
478 | strerror(addr->basic_errno)); | |
479 | deliver_msglog("%s %s [%s]: %s\n", | |
480 | tod_stamp(tod_log), | |
481 | host->name, | |
482 | host->address, | |
483 | strerror(addr->basic_errno)); | |
484 | } | |
485 | } | |
486 | ||
487 | ||
488 | ||
489 | /************************************************* | |
490 | * Synchronize SMTP responses * | |
491 | *************************************************/ | |
492 | ||
493 | /* This function is called from smtp_deliver() to receive SMTP responses from | |
494 | the server, and match them up with the commands to which they relate. When | |
495 | PIPELINING is not in use, this function is called after every command, and is | |
496 | therefore somewhat over-engineered, but it is simpler to use a single scheme | |
497 | that works both with and without PIPELINING instead of having two separate sets | |
498 | of code. | |
499 | ||
500 | The set of commands that are buffered up with pipelining may start with MAIL | |
501 | and may end with DATA; in between are RCPT commands that correspond to the | |
502 | addresses whose status is PENDING_DEFER. All other commands (STARTTLS, AUTH, | |
503 | etc.) are never buffered. | |
504 | ||
505 | Errors after MAIL or DATA abort the whole process leaving the response in the | |
506 | buffer. After MAIL, pending responses are flushed, and the original command is | |
507 | re-instated in big_buffer for error messages. For RCPT commands, the remote is | |
508 | permitted to reject some recipient addresses while accepting others. However | |
509 | certain errors clearly abort the whole process. Set the value in | |
510 | transport_return to PENDING_OK if the address is accepted. If there is a | |
511 | subsequent general error, it will get reset accordingly. If not, it will get | |
512 | converted to OK at the end. | |
513 | ||
514 | Arguments: | |
515 | addrlist the complete address list | |
516 | include_affixes TRUE if affixes include in RCPT | |
517 | sync_addr ptr to the ptr of the one to start scanning at (updated) | |
518 | host the host we are connected to | |
519 | count the number of responses to read | |
520 | pending_MAIL true if the first response is for MAIL | |
521 | pending_DATA 0 if last command sent was not DATA | |
522 | +1 if previously had a good recipient | |
523 | -1 if not previously had a good recipient | |
524 | inblock incoming SMTP block | |
525 | timeout timeout value | |
526 | buffer buffer for reading response | |
527 | buffsize size of buffer | |
528 | ||
529 | Returns: 3 if at least one address had 2xx and one had 5xx | |
530 | 2 if at least one address had 5xx but none had 2xx | |
531 | 1 if at least one host had a 2xx response, but none had 5xx | |
532 | 0 no address had 2xx or 5xx but no errors (all 4xx, or just DATA) | |
533 | -1 timeout while reading RCPT response | |
534 | -2 I/O or other non-response error for RCPT | |
535 | -3 DATA or MAIL failed - errno and buffer set | |
536 | */ | |
537 | ||
538 | static int | |
539 | sync_responses(address_item *addrlist, BOOL include_affixes, | |
540 | address_item **sync_addr, host_item *host, int count, BOOL pending_MAIL, | |
541 | int pending_DATA, smtp_inblock *inblock, int timeout, uschar *buffer, | |
542 | int buffsize) | |
543 | { | |
544 | address_item *addr = *sync_addr; | |
545 | int yield = 0; | |
546 | ||
547 | /* Handle the response for a MAIL command. On error, reinstate the original | |
548 | command in big_buffer for error message use, and flush any further pending | |
549 | responses before returning, except after I/O errors and timeouts. */ | |
550 | ||
551 | if (pending_MAIL) | |
552 | { | |
553 | count--; | |
554 | if (!smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
555 | { | |
556 | Ustrcpy(big_buffer, mail_command); /* Fits, because it came from there! */ | |
557 | if (errno == 0 && buffer[0] != 0) | |
558 | { | |
559 | uschar flushbuffer[4096]; | |
560 | while (count-- > 0) | |
561 | { | |
562 | if (!smtp_read_response(inblock, flushbuffer, sizeof(flushbuffer), | |
563 | '2', timeout) | |
564 | && (errno != 0 || flushbuffer[0] == 0)) | |
565 | break; | |
566 | } | |
567 | } | |
568 | return -3; | |
569 | } | |
570 | } | |
571 | ||
572 | if (pending_DATA) count--; /* Number of RCPT responses to come */ | |
573 | ||
574 | /* Read and handle the required number of RCPT responses, matching each one up | |
575 | with an address by scanning for the next address whose status is PENDING_DEFER. | |
576 | */ | |
577 | ||
578 | while (count-- > 0) | |
579 | { | |
580 | while (addr->transport_return != PENDING_DEFER) addr = addr->next; | |
581 | ||
582 | /* The address was accepted */ | |
583 | ||
584 | if (smtp_read_response(inblock, buffer, buffsize, '2', timeout)) | |
585 | { | |
586 | yield |= 1; | |
587 | addr->transport_return = PENDING_OK; | |
588 | ||
589 | /* If af_dr_retry_exists is set, there was a routing delay on this address; | |
590 | ensure that any address-specific retry record is expunged. */ | |
591 | ||
592 | if (testflag(addr, af_dr_retry_exists)) | |
593 | retry_add_item(addr, addr->address_retry_key, rf_delete); | |
594 | } | |
595 | ||
596 | /* Timeout while reading the response */ | |
597 | ||
598 | else if (errno == ETIMEDOUT) | |
599 | { | |
600 | int save_errno = errno; | |
601 | uschar *message = string_sprintf("SMTP timeout while connected to %s [%s] " | |
602 | "after RCPT TO:<%s>", host->name, host->address, | |
603 | transport_rcpt_address(addr, include_affixes)); | |
604 | set_errno(addrlist, save_errno, message, DEFER); | |
605 | retry_add_item(addr, addr->address_retry_key, 0); | |
606 | host->update_waiting = FALSE; | |
607 | return -1; | |
608 | } | |
609 | ||
610 | /* Handle other errors in obtaining an SMTP response by returning -1. This | |
611 | will cause all the addresses to be deferred. Restore the SMTP command in | |
612 | big_buffer for which we are checking the response, so the error message | |
613 | makes sense. */ | |
614 | ||
615 | else if (errno != 0 || buffer[0] == 0) | |
616 | { | |
617 | string_format(big_buffer, big_buffer_size, "RCPT TO:<%s>", | |
618 | transport_rcpt_address(addr, include_affixes)); | |
619 | return -2; | |
620 | } | |
621 | ||
622 | /* Handle SMTP permanent and temporary response codes. */ | |
623 | ||
624 | else | |
625 | { | |
626 | addr->message = | |
627 | string_sprintf("SMTP error from remote mailer after RCPT TO:<%s>: " | |
628 | "host %s [%s]: %s", transport_rcpt_address(addr, include_affixes), | |
629 | host->name, host->address, string_printing(buffer)); | |
630 | deliver_msglog("%s %s\n", tod_stamp(tod_log), addr->message); | |
631 | ||
632 | /* The response was 5xx */ | |
633 | ||
634 | if (buffer[0] == '5') | |
635 | { | |
636 | addr->transport_return = FAIL; | |
637 | yield |= 2; | |
638 | } | |
639 | ||
640 | /* The response was 4xx */ | |
641 | ||
642 | else | |
643 | { | |
644 | int bincode = (buffer[1] - '0')*10 + buffer[2] - '0'; | |
645 | ||
646 | addr->transport_return = DEFER; | |
647 | addr->basic_errno = ERRNO_RCPT4XX; | |
648 | addr->more_errno |= bincode << 8; | |
649 | ||
650 | /* Log temporary errors if there are more hosts to be tried. */ | |
651 | ||
652 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", addr->message); | |
653 | ||
654 | /* Do not put this message on the list of those waiting for this host, | |
655 | as otherwise it is likely to be tried too often. */ | |
656 | ||
657 | host->update_waiting = FALSE; | |
658 | ||
659 | /* Add a retry item for the address so that it doesn't get tried | |
660 | again too soon. */ | |
661 | ||
662 | retry_add_item(addr, addr->address_retry_key, 0); | |
663 | } | |
664 | } | |
665 | } /* Loop for next RCPT response */ | |
666 | ||
667 | /* Update where to start at for the next block of responses, unless we | |
668 | have already handled all the addresses. */ | |
669 | ||
670 | if (addr != NULL) *sync_addr = addr->next; | |
671 | ||
672 | /* Handle a response to DATA. If we have not had any good recipients, either | |
673 | previously or in this block, the response is ignored. */ | |
674 | ||
675 | if (pending_DATA != 0 && | |
676 | !smtp_read_response(inblock, buffer, buffsize, '3', timeout)) | |
677 | { | |
678 | int code; | |
679 | uschar *msg; | |
680 | if (pending_DATA > 0 || (yield & 1) != 0) return -3; | |
681 | (void)check_response(host, &errno, 0, buffer, &code, &msg); | |
682 | DEBUG(D_transport) debug_printf("%s\nerror for DATA ignored: pipelining " | |
683 | "is in use and there were no good recipients\n", msg); | |
684 | } | |
685 | ||
686 | /* All responses read and handled; MAIL (if present) received 2xx and DATA (if | |
687 | present) received 3xx. If any RCPTs were handled and yielded anything other | |
688 | than 4xx, yield will be set non-zero. */ | |
689 | ||
690 | return yield; | |
691 | } | |
692 | ||
693 | ||
694 | ||
695 | /************************************************* | |
696 | * Deliver address list to given host * | |
697 | *************************************************/ | |
698 | ||
699 | /* If continue_hostname is not null, we get here only when continuing to | |
700 | deliver down an existing channel. The channel was passed as the standard | |
701 | input. | |
702 | ||
703 | Otherwise, we have to make a connection to the remote host, and do the | |
704 | initial protocol exchange. | |
705 | ||
706 | When running as an MUA wrapper, if the sender or any recipient is rejected, | |
707 | temporarily or permanently, we force failure for all recipients. | |
708 | ||
709 | Arguments: | |
710 | addrlist chain of potential addresses to deliver; only those whose | |
711 | transport_return field is set to PENDING_DEFER are currently | |
712 | being processed; others should be skipped - they have either | |
713 | been delivered to an earlier host or IP address, or been | |
714 | failed by one of them. | |
715 | host host to deliver to | |
716 | host_af AF_INET or AF_INET6 | |
717 | port TCP/IP port to use, in host byte order | |
718 | interface interface to bind to, or NULL | |
719 | tblock transport instance block | |
720 | copy_host TRUE if host set in addr->host_used must be copied, because | |
721 | it is specific to this call of the transport | |
722 | message_defer set TRUE if yield is OK, but all addresses were deferred | |
723 | because of a non-recipient, non-host failure, that is, a | |
724 | 4xx response to MAIL FROM, DATA, or ".". This is a defer | |
725 | that is specific to the message. | |
726 | suppress_tls if TRUE, don't attempt a TLS connection - this is set for | |
727 | a second attempt after TLS initialization fails | |
728 | ||
729 | Returns: OK - the connection was made and the delivery attempted; | |
730 | the result for each address is in its data block. | |
731 | DEFER - the connection could not be made, or something failed | |
732 | while setting up the SMTP session, or there was a | |
733 | non-message-specific error, such as a timeout. | |
734 | ERROR - a filter command is specified for this transport, | |
735 | and there was a problem setting it up; OR helo_data | |
736 | or add_headers or authenticated_sender is specified | |
737 | for this transport, and the string failed to expand | |
738 | */ | |
739 | ||
740 | static int | |
741 | smtp_deliver(address_item *addrlist, host_item *host, int host_af, int port, | |
742 | uschar *interface, transport_instance *tblock, BOOL copy_host, | |
743 | BOOL *message_defer, BOOL suppress_tls) | |
744 | { | |
745 | address_item *addr; | |
746 | address_item *sync_addr; | |
747 | address_item *first_addr = addrlist; | |
748 | int yield = OK; | |
749 | int address_count; | |
750 | int save_errno; | |
751 | int rc; | |
752 | time_t start_delivery_time = time(NULL); | |
753 | smtp_transport_options_block *ob = | |
754 | (smtp_transport_options_block *)(tblock->options_block); | |
755 | BOOL lmtp = strcmpic(ob->protocol, US"lmtp") == 0; | |
756 | BOOL ok = FALSE; | |
757 | BOOL send_rset = TRUE; | |
758 | BOOL send_quit = TRUE; | |
759 | BOOL setting_up = TRUE; | |
760 | BOOL completed_address = FALSE; | |
761 | BOOL esmtp = TRUE; | |
762 | BOOL pending_MAIL; | |
763 | smtp_inblock inblock; | |
764 | smtp_outblock outblock; | |
765 | int max_rcpt = tblock->max_addresses; | |
766 | uschar *local_authenticated_sender = authenticated_sender; | |
767 | uschar *helo_data; | |
768 | uschar *message = NULL; | |
769 | uschar new_message_id[MESSAGE_ID_LENGTH + 1]; | |
770 | uschar *p; | |
771 | uschar buffer[4096]; | |
772 | uschar inbuffer[4096]; | |
773 | uschar outbuffer[1024]; | |
774 | ||
775 | suppress_tls = suppress_tls; /* stop compiler warning when no TLS support */ | |
776 | ||
777 | *message_defer = FALSE; | |
778 | smtp_command = US"initial connection"; | |
779 | if (max_rcpt == 0) max_rcpt = 999999; | |
780 | ||
781 | /* Set up the buffer for reading SMTP response packets. */ | |
782 | ||
783 | inblock.buffer = inbuffer; | |
784 | inblock.buffersize = sizeof(inbuffer); | |
785 | inblock.ptr = inbuffer; | |
786 | inblock.ptrend = inbuffer; | |
787 | ||
788 | /* Set up the buffer for holding SMTP commands while pipelining */ | |
789 | ||
790 | outblock.buffer = outbuffer; | |
791 | outblock.buffersize = sizeof(outbuffer); | |
792 | outblock.ptr = outbuffer; | |
793 | outblock.cmd_count = 0; | |
794 | outblock.authenticating = FALSE; | |
795 | ||
796 | /* Expand the greeting message */ | |
797 | ||
798 | helo_data = expand_string(ob->helo_data); | |
799 | if (helo_data == NULL) | |
800 | { | |
801 | uschar *message = string_sprintf("failed to expand helo_data: %s", | |
802 | expand_string_message); | |
803 | set_errno(addrlist, 0, message, DEFER); | |
804 | return ERROR; | |
805 | } | |
806 | ||
807 | /* If an authenticated_sender override has been specified for this transport | |
808 | instance, expand it. If the expansion is forced to fail, and there was already | |
809 | an authenticated_sender for this message, the original value will be used. | |
810 | Other expansion failures are serious. An empty result is ignored, but there is | |
811 | otherwise no check - this feature is expected to be used with LMTP and other | |
812 | cases where non-standard addresses (e.g. without domains) might be required. */ | |
813 | ||
814 | if (ob->authenticated_sender != NULL) | |
815 | { | |
816 | uschar *new = expand_string(ob->authenticated_sender); | |
817 | if (new == NULL) | |
818 | { | |
819 | if (!expand_string_forcedfail) | |
820 | { | |
821 | uschar *message = string_sprintf("failed to expand " | |
822 | "authenticated_sender: %s", expand_string_message); | |
823 | set_errno(addrlist, 0, message, DEFER); | |
824 | return ERROR; | |
825 | } | |
826 | } | |
827 | else if (new[0] != 0) local_authenticated_sender = new; | |
828 | } | |
829 | ||
830 | /* Make a connection to the host if this isn't a continued delivery, and handle | |
831 | the initial interaction and HELO/EHLO/LHLO. Connect timeout errors are handled | |
832 | specially so they can be identified for retries. */ | |
833 | ||
834 | if (continue_hostname == NULL) | |
835 | { | |
836 | inblock.sock = outblock.sock = | |
837 | smtp_connect(host, host_af, port, interface, ob->connect_timeout, | |
838 | ob->keepalive); | |
839 | if (inblock.sock < 0) | |
840 | { | |
841 | set_errno(addrlist, (errno == ETIMEDOUT)? ERRNO_CONNECTTIMEOUT : errno, | |
842 | NULL, DEFER); | |
843 | return DEFER; | |
844 | } | |
845 | ||
846 | /* The first thing is to wait for an initial OK response. The dreaded "goto" | |
847 | is nevertheless a reasonably clean way of programming this kind of logic, | |
848 | where you want to escape on any error. */ | |
849 | ||
850 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
851 | ob->command_timeout)) goto RESPONSE_FAILED; | |
852 | ||
853 | /** Debugging without sending a message | |
854 | addrlist->transport_return = DEFER; | |
855 | goto SEND_QUIT; | |
856 | **/ | |
857 | ||
858 | /* Errors that occur after this point follow an SMTP command, which is | |
859 | left in big_buffer by smtp_write_command() for use in error messages. */ | |
860 | ||
861 | smtp_command = big_buffer; | |
862 | ||
863 | /* Tell the remote who we are... | |
864 | ||
865 | February 1998: A convention has evolved that ESMTP-speaking MTAs include the | |
866 | string "ESMTP" in their greeting lines, so make Exim send EHLO if the | |
867 | greeting is of this form. The assumption was that the far end supports it | |
868 | properly... but experience shows that there are some that give 5xx responses, | |
869 | even though the banner includes "ESMTP" (there's a bloody-minded one that | |
870 | says "ESMTP not spoken here"). Cope with that case. | |
871 | ||
872 | September 2000: Time has passed, and it seems reasonable now to always send | |
873 | EHLO at the start. It is also convenient to make the change while installing | |
874 | the TLS stuff. | |
875 | ||
876 | July 2003: Joachim Wieland met a broken server that advertises "PIPELINING" | |
877 | but times out after sending MAIL FROM, RCPT TO and DATA all together. There | |
878 | would be no way to send out the mails, so there is now a host list | |
879 | "hosts_avoid_esmtp" that disables ESMTP for special hosts and solves the | |
880 | PIPELINING problem as well. Maybe it can also be useful to cure other | |
881 | problems with broken servers. | |
882 | ||
883 | Exim originally sent "Helo" at this point and ran for nearly a year that way. | |
884 | Then somebody tried it with a Microsoft mailer... It seems that all other | |
885 | mailers use upper case for some reason (the RFC is quite clear about case | |
886 | independence) so, for peace of mind, I gave in. */ | |
887 | ||
888 | esmtp = verify_check_this_host(&(ob->hosts_avoid_esmtp), NULL, | |
889 | host->name, host->address, NULL) != OK; | |
890 | ||
891 | if (esmtp) | |
892 | { | |
893 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", | |
894 | lmtp? "LHLO" : "EHLO", helo_data) < 0) | |
895 | goto SEND_FAILED; | |
896 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
897 | ob->command_timeout)) | |
898 | { | |
899 | if (errno != 0 || buffer[0] == 0 || lmtp) goto RESPONSE_FAILED; | |
900 | esmtp = FALSE; | |
901 | } | |
902 | } | |
903 | else | |
904 | { | |
905 | DEBUG(D_transport) | |
906 | debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n"); | |
907 | } | |
908 | ||
909 | if (!esmtp) | |
910 | { | |
911 | if (smtp_write_command(&outblock, FALSE, "HELO %s\r\n", helo_data) < 0) | |
912 | goto SEND_FAILED; | |
913 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
914 | ob->command_timeout)) goto RESPONSE_FAILED; | |
915 | } | |
916 | ||
917 | /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */ | |
918 | ||
919 | #ifdef SUPPORT_TLS | |
920 | tls_offered = esmtp && | |
921 | pcre_exec(regex_STARTTLS, NULL, CS buffer, Ustrlen(buffer), 0, | |
922 | PCRE_EOPT, NULL, 0) >= 0; | |
923 | #endif | |
924 | } | |
925 | ||
926 | /* For continuing deliveries down the same channel, the socket is the standard | |
927 | input, and we don't need to redo EHLO here (but may need to do so for TLS - see | |
928 | below). Set up the pointer to where subsequent commands will be left, for | |
929 | error messages. Note that smtp_use_size and smtp_use_pipelining will have been | |
930 | set from the command line if they were set in the process that passed the | |
931 | connection on. */ | |
932 | ||
933 | else | |
934 | { | |
935 | inblock.sock = outblock.sock = fileno(stdin); | |
936 | smtp_command = big_buffer; | |
937 | } | |
938 | ||
939 | /* If TLS is available on this connection, whether continued or not, attempt to | |
940 | start up a TLS session, unless the host is in hosts_avoid_tls. If successful, | |
941 | send another EHLO - the server may give a different answer in secure mode. We | |
942 | use a separate buffer for reading the response to STARTTLS so that if it is | |
943 | negative, the original EHLO data is available for subsequent analysis, should | |
944 | the client not be required to use TLS. If the response is bad, copy the buffer | |
945 | for error analysis. */ | |
946 | ||
947 | #ifdef SUPPORT_TLS | |
948 | if (tls_offered && !suppress_tls && | |
949 | verify_check_this_host(&(ob->hosts_avoid_tls), NULL, host->name, | |
950 | host->address, NULL) != OK) | |
951 | { | |
952 | uschar buffer2[4096]; | |
953 | if (smtp_write_command(&outblock, FALSE, "STARTTLS\r\n") < 0) | |
954 | goto SEND_FAILED; | |
955 | ||
956 | /* If there is an I/O error, transmission of this message is deferred. If | |
957 | there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is | |
958 | false, we also defer. However, if there is a temporary rejection of STARTTLS | |
959 | and tls_tempfail_tryclear is true, or if there is an outright rejection of | |
960 | STARTTLS, we carry on. This means we will try to send the message in clear, | |
961 | unless the host is in hosts_require_tls (tested below). */ | |
962 | ||
963 | if (!smtp_read_response(&inblock, buffer2, sizeof(buffer2), '2', | |
964 | ob->command_timeout)) | |
965 | { | |
966 | Ustrncpy(buffer, buffer2, sizeof(buffer)); | |
967 | if (errno != 0 || buffer2[0] == 0 || | |
968 | (buffer2[0] == '4' && !ob->tls_tempfail_tryclear)) | |
969 | goto RESPONSE_FAILED; | |
970 | } | |
971 | ||
972 | /* STARTTLS accepted: try to negotiate a TLS session. */ | |
973 | ||
974 | else | |
975 | { | |
976 | int rc = tls_client_start(inblock.sock, host, addrlist, | |
977 | NULL, /* No DH param */ | |
978 | ob->tls_certificate, | |
979 | ob->tls_privatekey, | |
980 | ob->tls_verify_certificates, | |
981 | ob->tls_crl, | |
982 | ob->tls_require_ciphers, | |
983 | ob->command_timeout); | |
984 | ||
985 | /* TLS negotiation failed; give an error. From outside, this function may | |
986 | be called again to try in clear on a new connection, if the options permit | |
987 | it for this host. */ | |
988 | ||
989 | if (rc != OK) | |
990 | { | |
991 | save_errno = ERRNO_TLSFAILURE; | |
992 | message = US"failure while setting up TLS session"; | |
993 | send_quit = FALSE; | |
994 | goto TLS_FAILED; | |
995 | } | |
996 | ||
997 | /* TLS session is set up */ | |
998 | ||
999 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
1000 | { | |
1001 | addr->cipher = tls_cipher; | |
1002 | addr->peerdn = tls_peerdn; | |
1003 | } | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | /* If we started TLS, redo the EHLO/LHLO exchange over the secure channel. */ | |
1008 | ||
1009 | if (tls_active >= 0) | |
1010 | { | |
1011 | if (smtp_write_command(&outblock, FALSE, "%s %s\r\n", lmtp? "LHLO" : "EHLO", | |
1012 | helo_data) < 0) | |
1013 | goto SEND_FAILED; | |
1014 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1015 | ob->command_timeout)) | |
1016 | goto RESPONSE_FAILED; | |
1017 | } | |
1018 | ||
1019 | /* If the host is required to use a secure channel, ensure that we | |
1020 | have one. */ | |
1021 | ||
1022 | else if (verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, | |
1023 | host->address, NULL) == OK) | |
1024 | { | |
1025 | save_errno = ERRNO_TLSREQUIRED; | |
1026 | message = string_sprintf("a TLS session is required for %s [%s], but %s", | |
1027 | host->name, host->address, | |
1028 | tls_offered? "an attempt to start TLS failed" : | |
1029 | "the server did not offer TLS support"); | |
1030 | goto TLS_FAILED; | |
1031 | } | |
1032 | #endif | |
1033 | ||
1034 | /* If TLS is active, we have just started it up and re-done the EHLO command, | |
1035 | so its response needs to be analyzed. If TLS is not active and this is a | |
1036 | continued session down a previously-used socket, we haven't just done EHLO, so | |
1037 | we skip this. */ | |
1038 | ||
1039 | if (continue_hostname == NULL | |
1040 | #ifdef SUPPORT_TLS | |
1041 | || tls_active >= 0 | |
1042 | #endif | |
1043 | ) | |
1044 | { | |
1045 | int require_auth; | |
1046 | uschar *fail_reason = US"server did not advertise AUTH support"; | |
1047 | ||
1048 | /* If the response to EHLO specified support for the SIZE parameter, note | |
1049 | this, provided size_addition is non-negative. */ | |
1050 | ||
1051 | smtp_use_size = esmtp && ob->size_addition >= 0 && | |
1052 | pcre_exec(regex_SIZE, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1053 | PCRE_EOPT, NULL, 0) >= 0; | |
1054 | ||
1055 | /* Note whether the server supports PIPELINING. If hosts_avoid_esmtp matched | |
1056 | the current host, esmtp will be false, so PIPELINING can never be used. */ | |
1057 | ||
1058 | smtp_use_pipelining = esmtp && | |
1059 | pcre_exec(regex_PIPELINING, NULL, CS buffer, Ustrlen(CS buffer), 0, | |
1060 | PCRE_EOPT, NULL, 0) >= 0; | |
1061 | ||
1062 | DEBUG(D_transport) debug_printf("%susing PIPELINING\n", | |
1063 | smtp_use_pipelining? "" : "not "); | |
1064 | ||
1065 | /* Note if the response to EHLO specifies support for the AUTH extension. | |
1066 | If it has, check that this host is one we want to authenticate to, and do | |
1067 | the business. The host name and address must be available when the | |
1068 | authenticator's client driver is running. */ | |
1069 | ||
1070 | smtp_authenticated = FALSE; | |
1071 | require_auth = verify_check_this_host(&(ob->hosts_require_auth), NULL, | |
1072 | host->name, host->address, NULL); | |
1073 | ||
1074 | if (esmtp && regex_match_and_setup(regex_AUTH, buffer, 0, -1)) | |
1075 | { | |
1076 | uschar *names = string_copyn(expand_nstring[1], expand_nlength[1]); | |
1077 | expand_nmax = -1; /* reset */ | |
1078 | ||
1079 | /* Must not do this check until after we have saved the result of the | |
1080 | regex match above. */ | |
1081 | ||
1082 | if (require_auth == OK || | |
1083 | verify_check_this_host(&(ob->hosts_try_auth), NULL, host->name, | |
1084 | host->address, NULL) == OK) | |
1085 | { | |
1086 | auth_instance *au; | |
1087 | fail_reason = US"no common mechanisms were found"; | |
1088 | ||
1089 | DEBUG(D_transport) debug_printf("scanning authentication mechanisms\n"); | |
1090 | ||
1091 | /* Scan the configured authenticators looking for one which is configured | |
1092 | for use as a client and whose name matches an authentication mechanism | |
1093 | supported by the server. If one is found, attempt to authenticate by | |
1094 | calling its client function. */ | |
1095 | ||
1096 | for (au = auths; !smtp_authenticated && au != NULL; au = au->next) | |
1097 | { | |
1098 | uschar *p = names; | |
1099 | if (!au->client) continue; | |
1100 | ||
1101 | /* Loop to scan supported server mechanisms */ | |
1102 | ||
1103 | while (*p != 0) | |
1104 | { | |
1105 | int rc; | |
1106 | int len = Ustrlen(au->public_name); | |
1107 | while (isspace(*p)) p++; | |
1108 | ||
1109 | if (strncmpic(au->public_name, p, len) != 0 || | |
1110 | (p[len] != 0 && !isspace(p[len]))) | |
1111 | { | |
1112 | while (*p != 0 && !isspace(*p)) p++; | |
1113 | continue; | |
1114 | } | |
1115 | ||
1116 | /* Found data for a listed mechanism. Call its client entry. Set | |
1117 | a flag in the outblock so that data is overwritten after sending so | |
1118 | that reflections don't show it. */ | |
1119 | ||
1120 | fail_reason = US"authentication attempt(s) failed"; | |
1121 | outblock.authenticating = TRUE; | |
1122 | rc = (au->info->clientcode)(au, &inblock, &outblock, | |
1123 | ob->command_timeout, buffer, sizeof(buffer)); | |
1124 | outblock.authenticating = FALSE; | |
1125 | DEBUG(D_transport) debug_printf("%s authenticator yielded %d\n", | |
1126 | au->name, rc); | |
1127 | ||
1128 | /* A temporary authentication failure must hold up delivery to | |
1129 | this host. After a permanent authentication failure, we carry on | |
1130 | to try other authentication methods. If all fail hard, try to | |
1131 | deliver the message unauthenticated unless require_auth was set. */ | |
1132 | ||
1133 | switch(rc) | |
1134 | { | |
1135 | case OK: | |
1136 | smtp_authenticated = TRUE; /* stops the outer loop */ | |
1137 | break; | |
1138 | ||
1139 | /* Failure after writing a command */ | |
1140 | ||
1141 | case FAIL_SEND: | |
1142 | goto SEND_FAILED; | |
1143 | ||
1144 | /* Failure after reading a response */ | |
1145 | ||
1146 | case FAIL: | |
1147 | if (errno != 0 || buffer[0] != '5') goto RESPONSE_FAILED; | |
1148 | log_write(0, LOG_MAIN, "%s authenticator failed H=%s [%s] %s", | |
1149 | au->name, host->name, host->address, buffer); | |
1150 | break; | |
1151 | ||
1152 | /* Failure by some other means. In effect, the authenticator | |
1153 | decided it wasn't prepared to handle this case. Typically this | |
1154 | is the result of "fail" in an expansion string. Do we need to | |
1155 | log anything here? */ | |
1156 | ||
1157 | case CANCELLED: | |
1158 | break; | |
1159 | ||
1160 | /* Internal problem, message in buffer. */ | |
1161 | ||
1162 | case ERROR: | |
1163 | yield = ERROR; | |
1164 | set_errno(addrlist, 0, string_copy(buffer), DEFER); | |
1165 | goto SEND_QUIT; | |
1166 | } | |
1167 | ||
1168 | break; /* If not authenticated, try next authenticator */ | |
1169 | } /* Loop for scanning supported server mechanisms */ | |
1170 | } /* Loop for further authenticators */ | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | /* If we haven't authenticated, but are required to, give up. */ | |
1175 | ||
1176 | if (require_auth == OK && !smtp_authenticated) | |
1177 | { | |
1178 | yield = DEFER; | |
1179 | set_errno(addrlist, ERRNO_AUTHFAIL, | |
1180 | string_sprintf("authentication required but %s", fail_reason), DEFER); | |
1181 | goto SEND_QUIT; | |
1182 | } | |
1183 | } | |
1184 | ||
1185 | /* The setting up of the SMTP call is now complete. Any subsequent errors are | |
1186 | message-specific. */ | |
1187 | ||
1188 | setting_up = FALSE; | |
1189 | ||
1190 | /* If there is a filter command specified for this transport, we can now | |
1191 | set it up. This cannot be done until the identify of the host is known. */ | |
1192 | ||
1193 | if (tblock->filter_command != NULL) | |
1194 | { | |
1195 | BOOL rc; | |
1196 | uschar buffer[64]; | |
1197 | sprintf(CS buffer, "%.50s transport", tblock->name); | |
1198 | rc = transport_set_up_command(&transport_filter_argv, tblock->filter_command, | |
1199 | TRUE, DEFER, addrlist, buffer, NULL); | |
1200 | ||
1201 | /* On failure, copy the error to all addresses, abandon the SMTP call, and | |
1202 | yield ERROR. */ | |
1203 | ||
1204 | if (!rc) | |
1205 | { | |
1206 | set_errno(addrlist->next, addrlist->basic_errno, addrlist->message, DEFER); | |
1207 | yield = ERROR; | |
1208 | goto SEND_QUIT; | |
1209 | } | |
1210 | } | |
1211 | ||
1212 | ||
1213 | /* For messages that have more than the maximum number of envelope recipients, | |
1214 | we want to send several transactions down the same SMTP connection. (See | |
1215 | comments in deliver.c as to how this reconciles, heuristically, with | |
1216 | remote_max_parallel.) This optimization was added to Exim after the following | |
1217 | code was already working. The simplest way to put it in without disturbing the | |
1218 | code was to use a goto to jump back to this point when there is another | |
1219 | transaction to handle. */ | |
1220 | ||
1221 | SEND_MESSAGE: | |
1222 | sync_addr = first_addr; | |
1223 | address_count = 0; | |
1224 | ok = FALSE; | |
1225 | send_rset = TRUE; | |
1226 | completed_address = FALSE; | |
1227 | ||
1228 | ||
1229 | /* Initiate a message transfer. If we know the receiving MTA supports the SIZE | |
1230 | qualification, send it, adding something to the message size to allow for | |
1231 | imprecision and things that get added en route. Exim keeps the number of lines | |
1232 | in a message, so we can give an accurate value for the original message, but we | |
1233 | need some additional to handle added headers. (Double "." characters don't get | |
1234 | included in the count.) */ | |
1235 | ||
1236 | p = buffer; | |
1237 | *p = 0; | |
1238 | ||
1239 | if (smtp_use_size) | |
1240 | { | |
1241 | sprintf(CS p, " SIZE=%d", message_size+message_linecount+ob->size_addition); | |
1242 | while (*p) p++; | |
1243 | } | |
1244 | ||
1245 | /* Add the authenticated sender address if present */ | |
1246 | ||
1247 | if (smtp_authenticated && local_authenticated_sender != NULL) | |
1248 | { | |
1249 | string_format(p, sizeof(buffer) - (p-buffer), " AUTH=%s", | |
1250 | auth_xtextencode(local_authenticated_sender, | |
1251 | Ustrlen(local_authenticated_sender))); | |
1252 | } | |
1253 | ||
1254 | /* From here until we send the DATA command, we can make use of PIPELINING | |
1255 | if the server host supports it. The code has to be able to check the responses | |
1256 | at any point, for when the buffer fills up, so we write it totally generally. | |
1257 | When PIPELINING is off, each command written reports that it has flushed the | |
1258 | buffer. */ | |
1259 | ||
1260 | pending_MAIL = TRUE; /* The block starts with MAIL */ | |
1261 | ||
1262 | rc = smtp_write_command(&outblock, smtp_use_pipelining, | |
1263 | "MAIL FROM:<%s>%s\r\n", return_path, buffer); | |
1264 | mail_command = string_copy(big_buffer); /* Save for later error message */ | |
1265 | ||
1266 | switch(rc) | |
1267 | { | |
1268 | case -1: /* Transmission error */ | |
1269 | goto SEND_FAILED; | |
1270 | ||
1271 | case +1: /* Block was sent */ | |
1272 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1273 | ob->command_timeout)) goto RESPONSE_FAILED; | |
1274 | pending_MAIL = FALSE; | |
1275 | break; | |
1276 | } | |
1277 | ||
1278 | /* Pass over all the relevant recipient addresses for this host, which are the | |
1279 | ones that have status PENDING_DEFER. If we are using PIPELINING, we can send | |
1280 | several before we have to read the responses for those seen so far. This | |
1281 | checking is done by a subroutine because it also needs to be done at the end. | |
1282 | Send only up to max_rcpt addresses at a time, leaving first_addr pointing to | |
1283 | the next one if not all are sent. | |
1284 | ||
1285 | In the MUA wrapper situation, we want to flush the PIPELINING buffer for the | |
1286 | last address because we want to abort if any recipients have any kind of | |
1287 | problem, temporary or permanent. We know that all recipient addresses will have | |
1288 | the PENDING_DEFER status, because only one attempt is ever made, and we know | |
1289 | that max_rcpt will be large, so all addresses will be done at once. */ | |
1290 | ||
1291 | for (addr = first_addr; | |
1292 | address_count < max_rcpt && addr != NULL; | |
1293 | addr = addr->next) | |
1294 | { | |
1295 | int count; | |
1296 | BOOL no_flush; | |
1297 | ||
1298 | if (addr->transport_return != PENDING_DEFER) continue; | |
1299 | ||
1300 | address_count++; | |
1301 | no_flush = smtp_use_pipelining && (!mua_wrapper || addr->next != NULL); | |
1302 | ||
1303 | /* Now send the RCPT command, and process outstanding responses when | |
1304 | necessary. After a timeout on RCPT, we just end the function, leaving the | |
1305 | yield as OK, because this error can often mean that there is a problem with | |
1306 | just one address, so we don't want to delay the host. */ | |
1307 | ||
1308 | count = smtp_write_command(&outblock, no_flush, "RCPT TO:<%s>\r\n", | |
1309 | transport_rcpt_address(addr, tblock->rcpt_include_affixes)); | |
1310 | if (count < 0) goto SEND_FAILED; | |
1311 | if (count > 0) | |
1312 | { | |
1313 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, | |
1314 | &sync_addr, host, count, pending_MAIL, 0, &inblock, | |
1315 | ob->command_timeout, buffer, sizeof(buffer))) | |
1316 | { | |
1317 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
1318 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
1319 | break; | |
1320 | ||
1321 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
1322 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
1323 | case 0: /* No 2xx or 5xx, but no probs */ | |
1324 | break; | |
1325 | ||
1326 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
1327 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL error */ | |
1328 | } | |
1329 | pending_MAIL = FALSE; /* Dealt with MAIL */ | |
1330 | } | |
1331 | } /* Loop for next address */ | |
1332 | ||
1333 | /* If we are an MUA wrapper, abort if any RCPTs were rejected, either | |
1334 | permanently or temporarily. We should have flushed and synced after the last | |
1335 | RCPT. */ | |
1336 | ||
1337 | if (mua_wrapper) | |
1338 | { | |
1339 | address_item *badaddr; | |
1340 | for (badaddr = first_addr; badaddr != NULL; badaddr = badaddr->next) | |
1341 | { | |
1342 | if (badaddr->transport_return != PENDING_OK) break; | |
1343 | } | |
1344 | if (badaddr != NULL) | |
1345 | { | |
1346 | set_errno(addrlist, 0, badaddr->message, FAIL); | |
1347 | ok = FALSE; | |
1348 | } | |
1349 | } | |
1350 | ||
1351 | /* If ok is TRUE, we know we have got at least one good recipient, and must now | |
1352 | send DATA, but if it is FALSE (in the normal, non-wrapper case), we may still | |
1353 | have a good recipient buffered up if we are pipelining. We don't want to waste | |
1354 | time sending DATA needlessly, so we only send it if either ok is TRUE or if we | |
1355 | are pipelining. The responses are all handled by sync_responses(). */ | |
1356 | ||
1357 | if (ok || (smtp_use_pipelining && !mua_wrapper)) | |
1358 | { | |
1359 | int count = smtp_write_command(&outblock, FALSE, "DATA\r\n"); | |
1360 | if (count < 0) goto SEND_FAILED; | |
1361 | switch(sync_responses(first_addr, tblock->rcpt_include_affixes, &sync_addr, | |
1362 | host, count, pending_MAIL, ok? +1 : -1, &inblock, | |
1363 | ob->command_timeout, buffer, sizeof(buffer))) | |
1364 | { | |
1365 | case 3: ok = TRUE; /* 2xx & 5xx => OK & progress made */ | |
1366 | case 2: completed_address = TRUE; /* 5xx (only) => progress made */ | |
1367 | break; | |
1368 | ||
1369 | case 1: ok = TRUE; /* 2xx (only) => OK, but if LMTP, */ | |
1370 | if (!lmtp) completed_address = TRUE; /* can't tell about progress yet */ | |
1371 | case 0: break; /* No 2xx or 5xx, but no probs */ | |
1372 | ||
1373 | case -1: goto END_OFF; /* Timeout on RCPT */ | |
1374 | default: goto RESPONSE_FAILED; /* I/O error, or any MAIL/DATA error */ | |
1375 | } | |
1376 | } | |
1377 | ||
1378 | /* Save the first address of the next batch. */ | |
1379 | ||
1380 | first_addr = addr; | |
1381 | ||
1382 | /* If there were no good recipients (but otherwise there have been no | |
1383 | problems), just set ok TRUE, since we have handled address-specific errors | |
1384 | already. Otherwise, it's OK to send the message. Use the check/escape mechanism | |
1385 | for handling the SMTP dot-handling protocol, flagging to apply to headers as | |
1386 | well as body. Set the appropriate timeout value to be used for each chunk. | |
1387 | (Haven't been able to make it work using select() for writing yet.) */ | |
1388 | ||
1389 | if (!ok) ok = TRUE; else | |
1390 | { | |
1391 | sigalrm_seen = FALSE; | |
1392 | transport_write_timeout = ob->data_timeout; | |
1393 | smtp_command = US"sending data block"; /* For error messages */ | |
1394 | DEBUG(D_transport|D_v) | |
1395 | debug_printf(" SMTP>> writing message and terminating \".\"\n"); | |
1396 | transport_count = 0; | |
1397 | ok = transport_write_message(addrlist, inblock.sock, | |
1398 | topt_use_crlf | topt_end_dot | topt_escape_headers | | |
1399 | (tblock->body_only? topt_no_headers : 0) | | |
1400 | (tblock->headers_only? topt_no_body : 0) | | |
1401 | (tblock->return_path_add? topt_add_return_path : 0) | | |
1402 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
1403 | (tblock->envelope_to_add? topt_add_envelope_to : 0), | |
1404 | 0, /* No size limit */ | |
1405 | tblock->add_headers, tblock->remove_headers, | |
1406 | US".", US"..", /* Escaping strings */ | |
1407 | tblock->rewrite_rules, tblock->rewrite_existflags); | |
1408 | ||
1409 | /* transport_write_message() uses write() because it is called from other | |
1410 | places to write to non-sockets. This means that under some OS (e.g. Solaris) | |
1411 | it can exit with "Broken pipe" as its error. This really means that the | |
1412 | socket got closed at the far end. */ | |
1413 | ||
1414 | transport_write_timeout = 0; /* for subsequent transports */ | |
1415 | ||
1416 | /* Failure can either be some kind of I/O disaster (including timeout), | |
1417 | or the failure of a transport filter or the expansion of added headers. */ | |
1418 | ||
1419 | if (!ok) | |
1420 | { | |
1421 | buffer[0] = 0; /* There hasn't been a response */ | |
1422 | goto RESPONSE_FAILED; | |
1423 | } | |
1424 | ||
1425 | /* We used to send the terminating "." explicitly here, but because of | |
1426 | buffering effects at both ends of TCP/IP connections, you don't gain | |
1427 | anything by keeping it separate, so it might as well go in the final | |
1428 | data buffer for efficiency. This is now done by setting the topt_end_dot | |
1429 | flag above. */ | |
1430 | ||
1431 | smtp_command = US"end of data"; | |
1432 | ||
1433 | /* For SMTP, we now read a single response that applies to the whole message. | |
1434 | If it is OK, then all the addresses have been delivered. */ | |
1435 | ||
1436 | if (!lmtp) ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1437 | ob->final_timeout); | |
1438 | ||
1439 | /* For LMTP, we get back a response for every RCPT command that we sent; | |
1440 | some may be accepted and some rejected. For those that get a response, their | |
1441 | status is fixed; any that are accepted have been handed over, even if later | |
1442 | responses crash - at least, that's how I read RFC 2033. | |
1443 | ||
1444 | If all went well, mark the recipient addresses as completed, record which | |
1445 | host/IPaddress they were delivered to, and cut out RSET when sending another | |
1446 | message down the same channel. Write the completed addresses to the journal | |
1447 | now so that they are recorded in case there is a crash of hardware or | |
1448 | software before the spool gets updated. Also record the final SMTP | |
1449 | confirmation if needed (for SMTP only). */ | |
1450 | ||
1451 | if (ok) | |
1452 | { | |
1453 | int flag = '='; | |
1454 | int delivery_time = (int)(time(NULL) - start_delivery_time); | |
1455 | int len; | |
1456 | host_item *thost; | |
1457 | uschar *conf = NULL; | |
1458 | send_rset = FALSE; | |
1459 | ||
1460 | /* Make a copy of the host if it is local to this invocation | |
1461 | of the transport. */ | |
1462 | ||
1463 | if (copy_host) | |
1464 | { | |
1465 | thost = store_get(sizeof(host_item)); | |
1466 | *thost = *host; | |
1467 | thost->name = string_copy(host->name); | |
1468 | thost->address = string_copy(host->address); | |
1469 | } | |
1470 | else thost = host; | |
1471 | ||
1472 | /* Set up confirmation if needed - applies only to SMTP */ | |
1473 | ||
1474 | if ((log_extra_selector & LX_smtp_confirmation) != 0 && !lmtp) | |
1475 | { | |
1476 | uschar *s = string_printing(buffer); | |
1477 | conf = (s == buffer)? (uschar *)string_copy(s) : s; | |
1478 | } | |
1479 | ||
1480 | /* Process all transported addresses - for LMTP, read a status for | |
1481 | each one. */ | |
1482 | ||
1483 | for (addr = addrlist; addr != first_addr; addr = addr->next) | |
1484 | { | |
1485 | if (addr->transport_return != PENDING_OK) continue; | |
1486 | ||
1487 | /* LMTP - if the response fails badly (e.g. timeout), use it for all the | |
1488 | remaining addresses. Otherwise, it's a return code for just the one | |
1489 | address. */ | |
1490 | ||
1491 | if (lmtp) | |
1492 | { | |
1493 | if (!smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1494 | ob->final_timeout)) | |
1495 | { | |
1496 | if (errno != 0 || buffer[0] == 0) goto RESPONSE_FAILED; | |
1497 | addr->message = string_sprintf("LMTP error after %s: %s", | |
1498 | big_buffer, string_printing(buffer)); | |
1499 | addr->transport_return = (buffer[0] == '5')? FAIL : DEFER; | |
1500 | continue; | |
1501 | } | |
1502 | completed_address = TRUE; /* NOW we can set this flag */ | |
1503 | } | |
1504 | ||
1505 | /* SMTP, or success return from LMTP for this address. Pass back the | |
1506 | actual port used. */ | |
1507 | ||
1508 | addr->transport_return = OK; | |
1509 | addr->more_errno = delivery_time; | |
1510 | thost->port = port; | |
1511 | addr->host_used = thost; | |
1512 | addr->special_action = flag; | |
1513 | addr->message = conf; | |
1514 | flag = '-'; | |
1515 | ||
1516 | /* Update the journal. For homonymic addresses, use the base address plus | |
1517 | the transport name. See lots of comments in deliver.c about the reasons | |
1518 | for the complications when homonyms are involved. Just carry on after | |
1519 | write error, as it may prove possible to update the spool file later. */ | |
1520 | ||
1521 | if (testflag(addr, af_homonym)) | |
1522 | sprintf(CS buffer, "%.500s/%s\n", addr->unique + 3, tblock->name); | |
1523 | else | |
1524 | sprintf(CS buffer, "%.500s\n", addr->unique); | |
1525 | ||
1526 | DEBUG(D_deliver) debug_printf("journalling %s", buffer); | |
1527 | len = Ustrlen(CS buffer); | |
1528 | if (write(journal_fd, buffer, len) != len) | |
1529 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to write journal for " | |
1530 | "%s: %s", buffer, strerror(errno)); | |
1531 | } | |
1532 | ||
1533 | /* Ensure the journal file is pushed out to disk. */ | |
1534 | ||
1535 | if (fsync(journal_fd) < 0) | |
1536 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to fsync journal: %s", | |
1537 | strerror(errno)); | |
1538 | } | |
1539 | } | |
1540 | ||
1541 | ||
1542 | /* Handle general (not specific to one address) failures here. The value of ok | |
1543 | is used to skip over this code on the falling through case. A timeout causes a | |
1544 | deferral. Other errors may defer or fail according to the response code, and | |
1545 | may set up a special errno value, e.g. after connection chopped, which is | |
1546 | assumed if errno == 0 and there is no text in the buffer. If control reaches | |
1547 | here during the setting up phase (i.e. before MAIL FROM) then always defer, as | |
1548 | the problem is not related to this specific message. */ | |
1549 | ||
1550 | if (!ok) | |
1551 | { | |
1552 | int code; | |
1553 | ||
1554 | RESPONSE_FAILED: | |
1555 | save_errno = errno; | |
1556 | message = NULL; | |
1557 | send_quit = check_response(host, &save_errno, addrlist->more_errno, | |
1558 | buffer, &code, &message); | |
1559 | goto FAILED; | |
1560 | ||
1561 | SEND_FAILED: | |
1562 | save_errno = errno; | |
1563 | code = '4'; | |
1564 | message = US string_sprintf("send() to %s [%s] failed: %s", | |
1565 | host->name, host->address, strerror(save_errno)); | |
1566 | send_quit = FALSE; | |
1567 | goto FAILED; | |
1568 | ||
1569 | /* This label is jumped to directly when a TLS negotiation has failed, | |
1570 | or was not done for a host for which it is required. Values will be set | |
1571 | in message and save_errno, and setting_up will always be true. Treat as | |
1572 | a temporary error. */ | |
1573 | ||
1574 | #ifdef SUPPORT_TLS | |
1575 | TLS_FAILED: | |
1576 | code = '4'; | |
1577 | #endif | |
1578 | ||
1579 | /* If the failure happened while setting up the call, see if the failure was | |
1580 | a 5xx response (this will either be on connection, or following HELO - a 5xx | |
1581 | after EHLO causes it to try HELO). If so, fail all addresses, as this host is | |
1582 | never going to accept them. For other errors during setting up (timeouts or | |
1583 | whatever), defer all addresses, and yield DEFER, so that the host is not | |
1584 | tried again for a while. */ | |
1585 | ||
1586 | FAILED: | |
1587 | ok = FALSE; /* For when reached by GOTO */ | |
1588 | ||
1589 | if (setting_up) | |
1590 | { | |
1591 | if (code == '5') | |
1592 | { | |
1593 | set_errno(addrlist, save_errno, message, FAIL); | |
1594 | } | |
1595 | else | |
1596 | { | |
1597 | set_errno(addrlist, save_errno, message, DEFER); | |
1598 | yield = DEFER; | |
1599 | } | |
1600 | } | |
1601 | ||
1602 | /* If there was an I/O error or timeout or other transportation error, | |
1603 | indicated by errno being non-zero, defer all addresses and yield DEFER, | |
1604 | except for the case of failed add_headers expansion, or a transport filter | |
1605 | failure, when the yield should be ERROR, to stop it trying other hosts. | |
1606 | ||
1607 | However, handle timeouts after MAIL FROM or "." and loss of connection after | |
1608 | "." specially. They can indicate a problem with the sender address or with | |
1609 | the contents of the message rather than a real error on the connection. | |
1610 | Therefore, treat these cases in the same way as a 4xx response. | |
1611 | ||
1612 | The following condition tests for NOT these special cases. */ | |
1613 | ||
1614 | else if (save_errno != 0 && | |
1615 | (save_errno != ETIMEDOUT || | |
1616 | (Ustrncmp(smtp_command,"MAIL",4) != 0 && | |
1617 | Ustrncmp(smtp_command,"end ",4) != 0)) && | |
1618 | (save_errno != ERRNO_SMTPCLOSED || | |
1619 | Ustrncmp(smtp_command,"end ",4) != 0)) | |
1620 | { | |
1621 | yield = (save_errno == ERRNO_CHHEADER_FAIL || | |
1622 | save_errno == ERRNO_FILTER_FAIL)? ERROR : DEFER; | |
1623 | set_errno(addrlist, save_errno, message, DEFER); | |
1624 | } | |
1625 | ||
1626 | /* Otherwise we have a message-specific error response from the remote | |
1627 | host. This is one of | |
1628 | (a) negative response or timeout after "mail from" | |
1629 | (b) negative response after "data" | |
1630 | (c) negative response or timeout or dropped connection after "." | |
1631 | It won't be a negative response or timeout after "rcpt to", as that is dealt | |
1632 | with separately above. The action in all cases is to set an appropriate | |
1633 | error code for all the addresses, but to leave yield set to OK because | |
1634 | the host itself has not failed. [It might in practice have failed for a | |
1635 | timeout after MAIL FROM, or "." but if so, we'll discover that at the next | |
1636 | delivery attempt.] For a temporary error, set the message_defer flag, and | |
1637 | write to the logs for information if this is not the last host. The error for | |
1638 | the last host will be logged as part of the address's log line. */ | |
1639 | ||
1640 | else | |
1641 | { | |
1642 | if (mua_wrapper) code = '5'; /* Force hard failure in wrapper mode */ | |
1643 | ||
1644 | set_errno(addrlist, save_errno, message, (code == '5')? FAIL : DEFER); | |
1645 | ||
1646 | /* If there's an errno, the message contains just the identity of | |
1647 | the host. */ | |
1648 | ||
1649 | if (code != '5') /* Anything other than 5 is treated as temporary */ | |
1650 | { | |
1651 | if (save_errno > 0) | |
1652 | message = US string_sprintf("%s: %s", message, strerror(save_errno)); | |
1653 | if (host->next != NULL) log_write(0, LOG_MAIN, "%s", message); | |
1654 | deliver_msglog("%s %s\n", tod_stamp(tod_log), message); | |
1655 | *message_defer = TRUE; | |
1656 | } | |
1657 | } | |
1658 | } | |
1659 | ||
1660 | ||
1661 | /* If all has gone well, send_quit will be set TRUE, implying we can end the | |
1662 | SMTP session tidily. However, if there were too many addresses to send in one | |
1663 | message (indicated by first_addr being non-NULL) we want to carry on with the | |
1664 | rest of them. Also, it is desirable to send more than one message down the SMTP | |
1665 | connection if there are several waiting, provided we haven't already sent so | |
1666 | many as to hit the configured limit. The function transport_check_waiting looks | |
1667 | for a waiting message and returns its id. Then transport_pass_socket tries to | |
1668 | set up a continued delivery by passing the socket on to another process. The | |
1669 | variable send_rset is FALSE if a message has just been successfully transfered. | |
1670 | ||
1671 | If we are already sending down a continued channel, there may be further | |
1672 | addresses not yet delivered that are aimed at the same host, but which have not | |
1673 | been passed in this run of the transport. In this case, continue_more will be | |
1674 | true, and all we should do is send RSET if necessary, and return, leaving the | |
1675 | channel open. | |
1676 | ||
1677 | However, if no address was disposed of, i.e. all addresses got 4xx errors, we | |
1678 | do not want to continue with other messages down the same channel, because that | |
1679 | can lead to looping between two or more messages, all with the same, | |
1680 | temporarily failing address(es). [The retry information isn't updated yet, so | |
1681 | new processes keep on trying.] We probably also don't want to try more of this | |
1682 | message's addresses either. | |
1683 | ||
1684 | If we have started a TLS session, we have to end it before passing the | |
1685 | connection to a new process. However, not all servers can handle this (Exim | |
1686 | can), so we do not pass such a connection on if the host matches | |
1687 | hosts_nopass_tls. */ | |
1688 | ||
1689 | DEBUG(D_transport) | |
1690 | debug_printf("ok=%d send_quit=%d send_rset=%d continue_more=%d " | |
1691 | "yield=%d first_address is %sNULL\n", ok, send_quit, send_rset, | |
1692 | continue_more, yield, (first_addr == NULL)? "":"not "); | |
1693 | ||
1694 | if (completed_address && ok && send_quit) | |
1695 | { | |
1696 | BOOL more; | |
1697 | if (first_addr != NULL || continue_more || | |
1698 | ( | |
1699 | (tls_active < 0 || | |
1700 | verify_check_this_host(&(ob->hosts_nopass_tls), NULL, host->name, | |
1701 | host->address, NULL) != OK) | |
1702 | && | |
1703 | transport_check_waiting(tblock->name, host->name, | |
1704 | tblock->connection_max_messages, new_message_id, &more) | |
1705 | )) | |
1706 | { | |
1707 | uschar *msg; | |
1708 | ||
1709 | if (send_rset) | |
1710 | { | |
1711 | if (! (ok = smtp_write_command(&outblock, FALSE, "RSET\r\n") >= 0)) | |
1712 | { | |
1713 | msg = US string_sprintf("send() to %s [%s] failed: %s", host->name, | |
1714 | host->address, strerror(save_errno)); | |
1715 | send_quit = FALSE; | |
1716 | } | |
1717 | else if (! (ok = smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1718 | ob->command_timeout))) | |
1719 | { | |
1720 | int code; | |
1721 | send_quit = check_response(host, &errno, 0, buffer, &code, &msg); | |
1722 | if (!send_quit) | |
1723 | { | |
1724 | DEBUG(D_transport) debug_printf("%s\n", msg); | |
1725 | } | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | /* Either RSET was not needed, or it succeeded */ | |
1730 | ||
1731 | if (ok) | |
1732 | { | |
1733 | if (first_addr != NULL) /* More addresses still to be sent */ | |
1734 | { /* in this run of the transport */ | |
1735 | continue_sequence++; /* Causes * in logging */ | |
1736 | goto SEND_MESSAGE; | |
1737 | } | |
1738 | if (continue_more) return yield; /* More addresses for another run */ | |
1739 | ||
1740 | /* Pass the socket to a new Exim process. Before doing so, we must shut | |
1741 | down TLS. Not all MTAs allow for the continuation of the SMTP session | |
1742 | when TLS is shut down. We test for this by sending a new EHLO. If we | |
1743 | don't get a good response, we don't attempt to pass the socket on. */ | |
1744 | ||
1745 | #ifdef SUPPORT_TLS | |
1746 | if (tls_active >= 0) | |
1747 | { | |
1748 | tls_close(TRUE); | |
1749 | ok = smtp_write_command(&outblock,FALSE,"EHLO %s\r\n",helo_data) >= 0 && | |
1750 | smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1751 | ob->command_timeout); | |
1752 | } | |
1753 | #endif | |
1754 | ||
1755 | /* If the socket is successfully passed, we musn't send QUIT (or | |
1756 | indeed anything!) from here. */ | |
1757 | ||
1758 | if (ok && transport_pass_socket(tblock->name, host->name, host->address, | |
1759 | new_message_id, inblock.sock)) | |
1760 | { | |
1761 | send_quit = FALSE; | |
1762 | } | |
1763 | } | |
1764 | ||
1765 | /* If RSET failed and there are addresses left, they get deferred. */ | |
1766 | ||
1767 | else set_errno(first_addr, errno, msg, DEFER); | |
1768 | } | |
1769 | } | |
1770 | ||
1771 | /* End off tidily with QUIT unless the connection has died or the socket has | |
1772 | been passed to another process. There has been discussion on the net about what | |
1773 | to do after sending QUIT. The wording of the RFC suggests that it is necessary | |
1774 | to wait for a response, but on the other hand, there isn't anything one can do | |
1775 | with an error response, other than log it. Exim used to do that. However, | |
1776 | further discussion suggested that it is positively advantageous not to wait for | |
1777 | the response, but to close the session immediately. This is supposed to move | |
1778 | the TCP/IP TIME_WAIT state from the server to the client, thereby removing some | |
1779 | load from the server. (Hosts that are both servers and clients may not see much | |
1780 | difference, of course.) Further discussion indicated that this was safe to do | |
1781 | on Unix systems which have decent implementations of TCP/IP that leave the | |
1782 | connection around for a while (TIME_WAIT) after the application has gone away. | |
1783 | This enables the response sent by the server to be properly ACKed rather than | |
1784 | timed out, as can happen on broken TCP/IP implementations on other OS. | |
1785 | ||
1786 | This change is being made on 31-Jul-98. After over a year of trouble-free | |
1787 | operation, the old commented-out code was removed on 17-Sep-99. */ | |
1788 | ||
1789 | SEND_QUIT: | |
1790 | if (send_quit) (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
1791 | ||
1792 | END_OFF: | |
1793 | ||
1794 | #ifdef SUPPORT_TLS | |
1795 | tls_close(TRUE); | |
1796 | #endif | |
1797 | ||
1798 | /* Close the socket, and return the appropriate value, first setting | |
1799 | continue_transport and continue_hostname NULL to prevent any other addresses | |
1800 | that may include the host from trying to re-use a continuation socket. This | |
1801 | works because the NULL setting is passed back to the calling process, and | |
1802 | remote_max_parallel is forced to 1 when delivering over an existing connection, | |
1803 | ||
1804 | If all went well and continue_more is set, we shouldn't actually get here if | |
1805 | there are further addresses, as the return above will be taken. However, | |
1806 | writing RSET might have failed, or there may be other addresses whose hosts are | |
1807 | specified in the transports, and therefore not visible at top level, in which | |
1808 | case continue_more won't get set. */ | |
1809 | ||
1810 | close(inblock.sock); | |
1811 | continue_transport = NULL; | |
1812 | continue_hostname = NULL; | |
1813 | return yield; | |
1814 | } | |
1815 | ||
1816 | ||
1817 | ||
1818 | ||
1819 | /************************************************* | |
1820 | * Closedown entry point * | |
1821 | *************************************************/ | |
1822 | ||
1823 | /* This function is called when exim is passed an open smtp channel | |
1824 | from another incarnation, but the message which it has been asked | |
1825 | to deliver no longer exists. The channel is on stdin. | |
1826 | ||
1827 | We might do fancy things like looking for another message to send down | |
1828 | the channel, but if the one we sought has gone, it has probably been | |
1829 | delivered by some other process that itself will seek further messages, | |
1830 | so just close down our connection. | |
1831 | ||
1832 | Argument: pointer to the transport instance block | |
1833 | Returns: nothing | |
1834 | */ | |
1835 | ||
1836 | void | |
1837 | smtp_transport_closedown(transport_instance *tblock) | |
1838 | { | |
1839 | smtp_transport_options_block *ob = | |
1840 | (smtp_transport_options_block *)(tblock->options_block); | |
1841 | smtp_inblock inblock; | |
1842 | smtp_outblock outblock; | |
1843 | uschar buffer[256]; | |
1844 | uschar inbuffer[4096]; | |
1845 | uschar outbuffer[16]; | |
1846 | ||
1847 | inblock.sock = fileno(stdin); | |
1848 | inblock.buffer = inbuffer; | |
1849 | inblock.buffersize = sizeof(inbuffer); | |
1850 | inblock.ptr = inbuffer; | |
1851 | inblock.ptrend = inbuffer; | |
1852 | ||
1853 | outblock.sock = inblock.sock; | |
1854 | outblock.buffersize = sizeof(outbuffer); | |
1855 | outblock.buffer = outbuffer; | |
1856 | outblock.ptr = outbuffer; | |
1857 | outblock.cmd_count = 0; | |
1858 | outblock.authenticating = FALSE; | |
1859 | ||
1860 | (void)smtp_write_command(&outblock, FALSE, "QUIT\r\n"); | |
1861 | (void)smtp_read_response(&inblock, buffer, sizeof(buffer), '2', | |
1862 | ob->command_timeout); | |
1863 | close(inblock.sock); | |
1864 | } | |
1865 | ||
1866 | ||
1867 | ||
1868 | /************************************************* | |
1869 | * Prepare addresses for delivery * | |
1870 | *************************************************/ | |
1871 | ||
1872 | /* This function is called to flush out error settings from previous delivery | |
1873 | attempts to other hosts. It also records whether we got here via an MX record | |
1874 | or not in the more_errno field of the address. We are interested only in | |
1875 | addresses that are still marked DEFER - others may have got delivered to a | |
1876 | previously considered IP address. Set their status to PENDING_DEFER to indicate | |
1877 | which ones are relevant this time. | |
1878 | ||
1879 | Arguments: | |
1880 | addrlist the list of addresses | |
1881 | host the host we are delivering to | |
1882 | ||
1883 | Returns: the first address for this delivery | |
1884 | */ | |
1885 | ||
1886 | static address_item * | |
1887 | prepare_addresses(address_item *addrlist, host_item *host) | |
1888 | { | |
1889 | address_item *first_addr = NULL; | |
1890 | address_item *addr; | |
1891 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
1892 | { | |
1893 | if (addr->transport_return != DEFER) continue; | |
1894 | if (first_addr == NULL) first_addr = addr; | |
1895 | addr->transport_return = PENDING_DEFER; | |
1896 | addr->basic_errno = 0; | |
1897 | addr->more_errno = (host->mx >= 0)? 'M' : 'A'; | |
1898 | addr->message = NULL; | |
1899 | #ifdef SUPPORT_TLS | |
1900 | addr->cipher = NULL; | |
1901 | addr->peerdn = NULL; | |
1902 | #endif | |
1903 | } | |
1904 | return first_addr; | |
1905 | } | |
1906 | ||
1907 | ||
1908 | ||
1909 | /************************************************* | |
1910 | * Main entry point * | |
1911 | *************************************************/ | |
1912 | ||
1913 | /* See local README for interface details. As this is a remote transport, it is | |
1914 | given a chain of addresses to be delivered in one connection, if possible. It | |
1915 | always returns TRUE, indicating that each address has its own independent | |
1916 | status set, except if there is a setting up problem, in which case it returns | |
1917 | FALSE. */ | |
1918 | ||
1919 | BOOL | |
1920 | smtp_transport_entry( | |
1921 | transport_instance *tblock, /* data for this instantiation */ | |
1922 | address_item *addrlist) /* addresses we are working on */ | |
1923 | { | |
1924 | int cutoff_retry; | |
1925 | int port; | |
1926 | int hosts_defer = 0; | |
1927 | int hosts_fail = 0; | |
1928 | int hosts_looked_up = 0; | |
1929 | int hosts_retry = 0; | |
1930 | int hosts_serial = 0; | |
1931 | int hosts_total = 0; | |
533244af | 1932 | int total_hosts_tried = 0; |
0756eb3c PH |
1933 | address_item *addr; |
1934 | BOOL expired = TRUE; | |
1935 | BOOL continuing = continue_hostname != NULL; | |
1936 | uschar *expanded_hosts = NULL; | |
1937 | uschar *pistring; | |
1938 | uschar *tid = string_sprintf("%s transport", tblock->name); | |
1939 | smtp_transport_options_block *ob = | |
1940 | (smtp_transport_options_block *)(tblock->options_block); | |
1941 | host_item *hostlist = addrlist->host_list; | |
1942 | host_item *host = NULL; | |
1943 | ||
1944 | DEBUG(D_transport) | |
1945 | { | |
1946 | debug_printf("%s transport entered\n", tblock->name); | |
1947 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
1948 | debug_printf(" %s\n", addr->address); | |
1949 | if (continuing) debug_printf("already connected to %s [%s]\n", | |
1950 | continue_hostname, continue_host_address); | |
1951 | } | |
1952 | ||
1953 | /* If a host list is not defined for the addresses - they must all have the | |
1954 | same one in order to be passed to a single transport - or if the transport has | |
1955 | a host list with hosts_override set, use the host list supplied with the | |
1956 | transport. It is an error for this not to exist. */ | |
1957 | ||
1958 | if (hostlist == NULL || (ob->hosts_override && ob->hosts != NULL)) | |
1959 | { | |
1960 | if (ob->hosts == NULL) | |
1961 | { | |
1962 | addrlist->message = string_sprintf("%s transport called with no hosts set", | |
1963 | tblock->name); | |
1964 | addrlist->transport_return = PANIC; | |
1965 | return FALSE; /* Only top address has status */ | |
1966 | } | |
1967 | ||
1968 | DEBUG(D_transport) debug_printf("using the transport's hosts: %s\n", | |
1969 | ob->hosts); | |
1970 | ||
1971 | /* If the transport's host list contains no '$' characters, and we are not | |
1972 | randomizing, it is fixed and therefore a chain of hosts can be built once | |
1973 | and for all, and remembered for subsequent use by other calls to this | |
1974 | transport. If, on the other hand, the host list does contain '$', or we are | |
1975 | randomizing its order, we have to rebuild it each time. In the fixed case, | |
1976 | as the hosts string will never be used again, it doesn't matter that we | |
1977 | replace all the : characters with zeros. */ | |
1978 | ||
1979 | if (ob->hostlist == NULL) | |
1980 | { | |
1981 | uschar *s = ob->hosts; | |
1982 | ||
1983 | if (Ustrchr(s, '$') != NULL) | |
1984 | { | |
1985 | expanded_hosts = expand_string(s); | |
1986 | if (expanded_hosts == NULL) | |
1987 | { | |
1988 | addrlist->message = string_sprintf("failed to expand list of hosts " | |
1989 | "\"%s\" in %s transport: %s", s, tblock->name, expand_string_message); | |
1990 | addrlist->transport_return = search_find_defer? DEFER : PANIC; | |
1991 | return FALSE; /* Only top address has status */ | |
1992 | } | |
1993 | DEBUG(D_transport) debug_printf("expanded list of hosts \"%s\" to " | |
1994 | "\"%s\"\n", s, expanded_hosts); | |
1995 | s = expanded_hosts; | |
1996 | } | |
1997 | else | |
1998 | if (ob->hosts_randomize) s = expanded_hosts = string_copy(s); | |
1999 | ||
2000 | host_build_hostlist(&hostlist, s, ob->hosts_randomize); | |
2001 | ||
2002 | /* If there was no expansion of hosts, save the host list for | |
2003 | next time. */ | |
2004 | ||
2005 | if (expanded_hosts == NULL) ob->hostlist = hostlist; | |
2006 | } | |
2007 | ||
2008 | /* This is not the first time this transport has been run in this delivery; | |
2009 | the host list was built previously. */ | |
2010 | ||
2011 | else hostlist = ob->hostlist; | |
2012 | } | |
2013 | ||
2014 | /* The host list was supplied with the address. If hosts_randomize is set, we | |
2015 | must sort it into a random order if it did not come from MX records and has not | |
2016 | already been randomized (but don't bother if continuing down an existing | |
2017 | connection). */ | |
2018 | ||
2019 | else if (ob->hosts_randomize && hostlist->mx == MX_NONE && !continuing) | |
2020 | { | |
2021 | host_item *newlist = NULL; | |
2022 | while (hostlist != NULL) | |
2023 | { | |
2024 | host_item *h = hostlist; | |
2025 | hostlist = hostlist->next; | |
2026 | ||
2027 | h->sort_key = random_number(100); | |
2028 | ||
2029 | if (newlist == NULL) | |
2030 | { | |
2031 | h->next = NULL; | |
2032 | newlist = h; | |
2033 | } | |
2034 | else if (h->sort_key < newlist->sort_key) | |
2035 | { | |
2036 | h->next = newlist; | |
2037 | newlist = h; | |
2038 | } | |
2039 | else | |
2040 | { | |
2041 | host_item *hh = newlist; | |
2042 | while (hh->next != NULL) | |
2043 | { | |
2044 | if (h->sort_key < hh->next->sort_key) break; | |
2045 | hh = hh->next; | |
2046 | } | |
2047 | h->next = hh->next; | |
2048 | hh->next = h; | |
2049 | } | |
2050 | } | |
2051 | ||
2052 | hostlist = addrlist->host_list = newlist; | |
2053 | } | |
2054 | ||
2055 | ||
2056 | /* Sort out the port. Set up a string for adding to the retry key if the port | |
2057 | number is not the standard SMTP port. */ | |
2058 | ||
2059 | if (!smtp_get_port(ob->port, addrlist, &port, tid)) return FALSE; | |
2060 | pistring = string_sprintf(":%d", port); | |
2061 | if (Ustrcmp(pistring, ":25") == 0) pistring = US""; | |
2062 | ||
2063 | ||
2064 | /* For each host-plus-IP-address on the list: | |
2065 | ||
2066 | . If this is a continued delivery and the host isn't the one with the | |
2067 | current connection, skip. | |
2068 | ||
2069 | . If the status is unusable (i.e. previously failed or retry checked), skip. | |
2070 | ||
2071 | . If no IP address set, get the address, either by turning the name into | |
2072 | an address, calling gethostbyname if gethostbyname is on, or by calling | |
2073 | the DNS. The DNS may yield multiple addresses, in which case insert the | |
2074 | extra ones into the list. | |
2075 | ||
2076 | . Get the retry data if not previously obtained for this address and set the | |
2077 | field which remembers the state of this address. Skip if the retry time is | |
2078 | not reached. If not, remember whether retry data was found. The retry string | |
2079 | contains both the name and the IP address. | |
2080 | ||
2081 | . Scan the list of addresses and mark those whose status is DEFER as | |
2082 | PENDING_DEFER. These are the only ones that will be processed in this cycle | |
2083 | of the hosts loop. | |
2084 | ||
2085 | . Make a delivery attempt - addresses marked PENDING_DEFER will be tried. | |
2086 | Some addresses may be successfully delivered, others may fail, and yet | |
2087 | others may get temporary errors and so get marked DEFER. | |
2088 | ||
2089 | . The return from the delivery attempt is OK if a connection was made and a | |
2090 | valid SMTP dialogue was completed. Otherwise it is DEFER. | |
2091 | ||
2092 | . If OK, add a "remove" retry item for this host/IPaddress, if any. | |
2093 | ||
2094 | . If fail to connect, or other defer state, add a retry item. | |
2095 | ||
2096 | . If there are any addresses whose status is still DEFER, carry on to the | |
2097 | next host/IPaddress, unless we have tried the number of hosts given | |
533244af PH |
2098 | by hosts_max_try or hosts_max_try_hardlimit; otherwise return. Note that |
2099 | there is some fancy logic for hosts_max_try that means its limit can be | |
2100 | overstepped in some circumstances. | |
0756eb3c PH |
2101 | |
2102 | If we get to the end of the list, all hosts have deferred at least one address, | |
2103 | or not reached their retry times. If delay_after_cutoff is unset, it requests a | |
2104 | delivery attempt to those hosts whose last try was before the arrival time of | |
2105 | the current message. To cope with this, we have to go round the loop a second | |
2106 | time. After that, set the status and error data for any addresses that haven't | |
2107 | had it set already. */ | |
2108 | ||
2109 | for (cutoff_retry = 0; expired && | |
2110 | cutoff_retry < ((ob->delay_after_cutoff)? 1 : 2); | |
2111 | cutoff_retry++) | |
2112 | { | |
2113 | host_item *nexthost = NULL; | |
2114 | int unexpired_hosts_tried = 0; | |
2115 | ||
2116 | for (host = hostlist; | |
533244af PH |
2117 | host != NULL && |
2118 | unexpired_hosts_tried < ob->hosts_max_try && | |
2119 | total_hosts_tried < ob->hosts_max_try_hardlimit; | |
0756eb3c PH |
2120 | host = nexthost) |
2121 | { | |
2122 | int rc; | |
2123 | int host_af; | |
2124 | uschar *rs; | |
2125 | BOOL serialized = FALSE; | |
2126 | BOOL host_is_expired = FALSE; | |
2127 | BOOL message_defer = FALSE; | |
2128 | BOOL ifchanges = FALSE; | |
2129 | BOOL some_deferred = FALSE; | |
2130 | address_item *first_addr = NULL; | |
2131 | uschar *interface = NULL; | |
2132 | uschar *retry_host_key = NULL; | |
2133 | uschar *retry_message_key = NULL; | |
2134 | uschar *serialize_key = NULL; | |
2135 | ||
2136 | /* Default next host is next host. :-) But this can vary if the | |
2137 | hosts_max_try limit is hit (see below). */ | |
2138 | ||
2139 | nexthost = host->next; | |
2140 | ||
2141 | /* Set the flag requesting that this host be added to the waiting | |
2142 | database if the delivery fails temporarily or if we are running with | |
2143 | queue_smtp or a 2-stage queue run. This gets unset for certain | |
2144 | kinds of error, typically those that are specific to the message. */ | |
2145 | ||
2146 | host->update_waiting = TRUE; | |
2147 | ||
2148 | /* If the address hasn't yet been obtained from the host name, look it up | |
2149 | now, unless the host is already marked as unusable. If it is marked as | |
2150 | unusable, it means that the router was unable to find its IP address (in | |
2151 | the DNS or wherever) OR we are in the 2nd time round the cutoff loop, and | |
2152 | the lookup failed last time. We don't get this far if *all* MX records | |
2153 | point to non-existent hosts; that is treated as a hard error. | |
2154 | ||
2155 | We can just skip this host entirely. When the hosts came from the router, | |
2156 | the address will timeout based on the other host(s); when the address is | |
2157 | looked up below, there is an explicit retry record added. | |
2158 | ||
2159 | Note that we mustn't skip unusable hosts if the address is not unset; they | |
2160 | may be needed as expired hosts on the 2nd time round the cutoff loop. */ | |
2161 | ||
2162 | if (host->address == NULL) | |
2163 | { | |
2164 | uschar *canonical_name; | |
2165 | ||
2166 | if (host->status >= hstatus_unusable) | |
2167 | { | |
2168 | DEBUG(D_transport) debug_printf("%s has no address and is unusable - skipping\n", | |
2169 | host->name); | |
2170 | continue; | |
2171 | } | |
2172 | ||
2173 | DEBUG(D_transport) debug_printf("getting address for %s\n", host->name); | |
2174 | ||
2175 | hosts_looked_up++; | |
2176 | ||
2177 | /* Find by name if so configured, or if it's an IP address. We don't | |
2178 | just copy the IP address, because we need the test-for-local to happen. */ | |
2179 | ||
2180 | if (ob->gethostbyname || string_is_ip_address(host->name, NULL)) | |
2181 | rc = host_find_byname(host, NULL, &canonical_name, TRUE); | |
2182 | else | |
2183 | { | |
2184 | int flags = HOST_FIND_BY_A; | |
2185 | if (ob->dns_qualify_single) flags |= HOST_FIND_QUALIFY_SINGLE; | |
2186 | if (ob->dns_search_parents) flags |= HOST_FIND_SEARCH_PARENTS; | |
2187 | rc = host_find_bydns(host, NULL, flags, NULL, NULL, NULL, | |
2188 | &canonical_name, NULL); | |
2189 | } | |
2190 | ||
2191 | /* Failure to find the host at this time (usually DNS temporary failure) | |
2192 | is really a kind of routing failure rather than a transport failure. | |
2193 | Therefore we add a retry item of the routing kind, not to stop us trying | |
2194 | to look this name up here again, but to ensure the address gets timed | |
2195 | out if the failures go on long enough. A complete failure at this point | |
2196 | commonly points to a configuration error, but the best action is still | |
2197 | to carry on for the next host. */ | |
2198 | ||
2199 | if (rc == HOST_FIND_AGAIN || rc == HOST_FIND_FAILED) | |
2200 | { | |
2201 | retry_add_item(addrlist, string_sprintf("R:%s", host->name), 0); | |
2202 | expired = FALSE; | |
2203 | if (rc == HOST_FIND_AGAIN) hosts_defer++; else hosts_fail++; | |
2204 | DEBUG(D_transport) debug_printf("rc = %s for %s\n", (rc == HOST_FIND_AGAIN)? | |
2205 | "HOST_FIND_AGAIN" : "HOST_FIND_FAILED", host->name); | |
2206 | host->status = hstatus_unusable; | |
2207 | ||
2208 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2209 | { | |
2210 | if (addr->transport_return != DEFER) continue; | |
2211 | addr->basic_errno = ERRNO_UNKNOWNHOST; | |
2212 | addr->message = | |
2213 | string_sprintf("failed to lookup IP address for %s", host->name); | |
2214 | } | |
2215 | continue; | |
2216 | } | |
2217 | ||
2218 | /* If the host is actually the local host, we may have a problem, or | |
2219 | there may be some cunning configuration going on. In the problem case, | |
2220 | log things and give up. The default transport status is already DEFER. */ | |
2221 | ||
2222 | if (rc == HOST_FOUND_LOCAL && !ob->allow_localhost) | |
2223 | { | |
2224 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2225 | { | |
2226 | addr->basic_errno = 0; | |
2227 | addr->message = string_sprintf("%s transport found host %s to be " | |
2228 | "local", tblock->name, host->name); | |
2229 | } | |
2230 | goto END_TRANSPORT; | |
2231 | } | |
2232 | } /* End of block for IP address lookup */ | |
2233 | ||
2234 | /* If this is a continued delivery, we are interested only in the host | |
2235 | which matches the name of the existing open channel. The check is put | |
2236 | here after the local host lookup, in case the name gets expanded as a | |
2237 | result of the lookup. Set expired FALSE, to save the outer loop executing | |
2238 | twice. */ | |
2239 | ||
2240 | if (continuing && (Ustrcmp(continue_hostname, host->name) != 0 || | |
2241 | Ustrcmp(continue_host_address, host->address) != 0)) | |
2242 | { | |
2243 | expired = FALSE; | |
2244 | continue; /* With next host */ | |
2245 | } | |
2246 | ||
2247 | /* If queue_smtp is set (-odqs or the first part of a 2-stage run), or the | |
2248 | domain is in queue_smtp_domains, we don't actually want to attempt any | |
2249 | deliveries. When doing a queue run, queue_smtp_domains is always unset. If | |
2250 | there is a lookup defer in queue_smtp_domains, proceed as if the domain | |
2251 | were not in it. We don't want to hold up all SMTP deliveries! Except when | |
2252 | doing a two-stage queue run, don't do this if forcing. */ | |
2253 | ||
2254 | if ((!deliver_force || queue_2stage) && (queue_smtp || | |
2255 | match_isinlist(addrlist->domain, &queue_smtp_domains, 0, NULL, NULL, | |
2256 | MCL_DOMAIN, TRUE, NULL) == OK)) | |
2257 | { | |
2258 | expired = FALSE; | |
2259 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2260 | { | |
2261 | if (addr->transport_return != DEFER) continue; | |
2262 | addr->message = US"domain matches queue_smtp_domains, or -odqs set"; | |
2263 | } | |
2264 | continue; /* With next host */ | |
2265 | } | |
2266 | ||
2267 | /* Count hosts being considered - purely for an intelligent comment | |
2268 | if none are usable. */ | |
2269 | ||
2270 | hosts_total++; | |
2271 | ||
2272 | /* Set $host and $host address now in case they are needed for the | |
2273 | interface expansion or the serialize_hosts check; they remain set if an | |
2274 | actual delivery happens. */ | |
2275 | ||
2276 | deliver_host = host->name; | |
2277 | deliver_host_address = host->address; | |
2278 | ||
2279 | /* Select IPv4 or IPv6, and choose an outgoing interface. If the interface | |
2280 | string changes upon expansion, we must add it to the key that is used for | |
2281 | retries, because connections to the same host from a different interface | |
2282 | should be treated separately. */ | |
2283 | ||
2284 | host_af = (Ustrchr(host->address, ':') == NULL)? AF_INET : AF_INET6; | |
2285 | if (!smtp_get_interface(ob->interface, host_af, addrlist, &ifchanges, | |
2286 | &interface, tid)) | |
2287 | return FALSE; | |
2288 | if (ifchanges) pistring = string_sprintf("%s/%s", pistring, interface); | |
2289 | ||
2290 | /* The first time round the outer loop, check the status of the host by | |
2291 | inspecting the retry data. The second time round, we are interested only | |
2292 | in expired hosts that haven't been tried since this message arrived. */ | |
2293 | ||
2294 | if (cutoff_retry == 0) | |
2295 | { | |
2296 | /* Ensure the status of the address is set by checking retry data if | |
2297 | necessary. There maybe host-specific retry data (applicable to all | |
2298 | messages) and also data for retries of a specific message at this host. | |
2299 | If either of these retry records are actually read, the keys used are | |
2300 | returned to save recomputing them later. */ | |
2301 | ||
2302 | host_is_expired = retry_check_address(addrlist->domain, host, pistring, | |
2303 | ob->retry_include_ip_address, &retry_host_key, &retry_message_key); | |
2304 | ||
2305 | DEBUG(D_transport) debug_printf("%s [%s]%s status = %s\n", host->name, | |
2306 | (host->address == NULL)? US"" : host->address, pistring, | |
2307 | (host->status == hstatus_usable)? "usable" : | |
2308 | (host->status == hstatus_unusable)? "unusable" : | |
2309 | (host->status == hstatus_unusable_expired)? "unusable (expired)" : "?"); | |
2310 | ||
2311 | /* Skip this address if not usable at this time, noting if it wasn't | |
2312 | actually expired, both locally and in the address. */ | |
2313 | ||
2314 | switch (host->status) | |
2315 | { | |
2316 | case hstatus_unusable: | |
2317 | expired = FALSE; | |
2318 | setflag(addrlist, af_retry_skipped); | |
2319 | /* Fall through */ | |
2320 | ||
2321 | case hstatus_unusable_expired: | |
2322 | switch (host->why) | |
2323 | { | |
2324 | case hwhy_retry: hosts_retry++; break; | |
2325 | case hwhy_failed: hosts_fail++; break; | |
2326 | case hwhy_deferred: hosts_defer++; break; | |
2327 | } | |
2328 | ||
2329 | /* If there was a retry message key, implying that previously there | |
2330 | was a message-specific defer, we don't want to update the list of | |
2331 | messages waiting for this host. */ | |
2332 | ||
2333 | if (retry_message_key != NULL) host->update_waiting = FALSE; | |
2334 | continue; /* With the next host or IP address */ | |
2335 | } | |
2336 | } | |
2337 | ||
2338 | /* Second time round the loop: if the address is set but expired, and | |
2339 | the message is newer than the last try, let it through. */ | |
2340 | ||
2341 | else | |
2342 | { | |
2343 | if (host->address == NULL || | |
2344 | host->status != hstatus_unusable_expired || | |
2345 | host->last_try > received_time) | |
2346 | continue; | |
2347 | DEBUG(D_transport) | |
2348 | debug_printf("trying expired host %s [%s]%s\n", | |
2349 | host->name, host->address, pistring); | |
2350 | host_is_expired = TRUE; | |
2351 | } | |
2352 | ||
2353 | /* Setting "expired=FALSE" doesn't actually mean not all hosts are expired; | |
2354 | it remains TRUE only if all hosts are expired and none are actually tried. | |
2355 | */ | |
2356 | ||
2357 | expired = FALSE; | |
2358 | ||
2359 | /* If this host is listed as one to which access must be serialized, | |
2360 | see if another Exim process has a connection to it, and if so, skip | |
2361 | this host. If not, update the database to record our connection to it | |
2362 | and remember this for later deletion. Do not do any of this if we are | |
2363 | sending the message down a pre-existing connection. */ | |
2364 | ||
2365 | if (!continuing && | |
2366 | verify_check_this_host(&(ob->serialize_hosts), NULL, host->name, | |
2367 | host->address, NULL) == OK) | |
2368 | { | |
2369 | serialize_key = string_sprintf("host-serialize-%s", host->name); | |
2370 | if (!enq_start(serialize_key)) | |
2371 | { | |
2372 | DEBUG(D_transport) | |
2373 | debug_printf("skipping host %s because another Exim process " | |
2374 | "is connected to it\n", host->name); | |
2375 | hosts_serial++; | |
2376 | continue; | |
2377 | } | |
2378 | serialized = TRUE; | |
2379 | } | |
2380 | ||
2381 | /* OK, we have an IP address that is not waiting for its retry time to | |
2382 | arrive (it might be expired) OR (second time round the loop) we have an | |
2383 | expired host that hasn't been tried since the message arrived. Have a go | |
2384 | at delivering the message to it. First prepare the addresses by flushing | |
2385 | out the result of previous attempts, and finding the first address that | |
2386 | is still to be delivered. */ | |
2387 | ||
2388 | first_addr = prepare_addresses(addrlist, host); | |
2389 | ||
2390 | DEBUG(D_transport) debug_printf("delivering %s to %s [%s] (%s%s)\n", | |
2391 | message_id, host->name, host->address, addrlist->address, | |
2392 | (addrlist->next == NULL)? "" : ", ..."); | |
2393 | ||
2394 | set_process_info("delivering %s to %s [%s] (%s%s)", | |
2395 | message_id, host->name, host->address, addrlist->address, | |
2396 | (addrlist->next == NULL)? "" : ", ..."); | |
2397 | ||
2398 | /* This is not for real; don't do the delivery. If there are | |
2399 | any remaining hosts, list them. */ | |
2400 | ||
2401 | if (dont_deliver) | |
2402 | { | |
2403 | host_item *host2; | |
2404 | set_errno(addrlist, 0, NULL, OK); | |
2405 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2406 | { | |
2407 | addr->host_used = host; | |
2408 | addr->special_action = '*'; | |
2409 | addr->message = US"delivery bypassed by -N option"; | |
2410 | } | |
2411 | DEBUG(D_transport) | |
2412 | { | |
2413 | debug_printf("*** delivery by %s transport bypassed by -N option\n" | |
2414 | "*** host and remaining hosts:\n", tblock->name); | |
2415 | for (host2 = host; host2 != NULL; host2 = host2->next) | |
2416 | debug_printf(" %s [%s]\n", host2->name, | |
2417 | (host2->address == NULL)? US"unset" : host2->address); | |
2418 | } | |
2419 | rc = OK; | |
2420 | } | |
2421 | ||
2422 | /* This is for real. If the host is expired, we don't count it for | |
2423 | hosts_max_retry. This ensures that all hosts must expire before an address | |
533244af PH |
2424 | is timed out, unless hosts_max_try_hardlimit (which protects against |
2425 | lunatic DNS configurations) is reached. | |
2426 | ||
2427 | If the host is not expired and we are about to hit the hosts_max_retry | |
2428 | limit, check to see if there is a subsequent hosts with a different MX | |
2429 | value. If so, make that the next host, and don't count this one. This is a | |
2430 | heuristic to make sure that different MXs do get tried. With a normal kind | |
2431 | of retry rule, they would get tried anyway when the earlier hosts were | |
2432 | delayed, but if the domain has a "retry every time" type of rule - as is | |
2433 | often used for the the very large ISPs, that won't happen. */ | |
0756eb3c PH |
2434 | |
2435 | else | |
2436 | { | |
2437 | if (!host_is_expired && ++unexpired_hosts_tried >= ob->hosts_max_try) | |
2438 | { | |
2439 | host_item *h; | |
2440 | DEBUG(D_transport) | |
2441 | debug_printf("hosts_max_try limit reached with this host\n"); | |
2442 | for (h = host; h != NULL; h = h->next) | |
2443 | if (h->mx != host->mx) break; | |
2444 | if (h != NULL) | |
2445 | { | |
2446 | nexthost = h; | |
2447 | unexpired_hosts_tried--; | |
2448 | DEBUG(D_transport) debug_printf("however, a higher MX host exists " | |
2449 | "and will be tried\n"); | |
2450 | } | |
2451 | } | |
2452 | ||
2453 | /* Attempt the delivery. */ | |
2454 | ||
533244af | 2455 | total_hosts_tried++; |
0756eb3c PH |
2456 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, |
2457 | expanded_hosts != NULL, &message_defer, FALSE); | |
2458 | ||
2459 | /* Yield is one of: | |
2460 | OK => connection made, each address contains its result; | |
2461 | message_defer is set for message-specific defers (when all | |
2462 | recipients are marked defer) | |
2463 | DEFER => there was a non-message-specific delivery problem; | |
2464 | ERROR => there was a problem setting up the arguments for a filter, | |
2465 | or there was a problem with expanding added headers | |
2466 | */ | |
2467 | ||
2468 | /* If the result is not OK, there was a non-message-specific problem. | |
2469 | If the result is DEFER, we need to write to the logs saying what happened | |
2470 | for this particular host, except in the case of authentication and TLS | |
2471 | failures, where the log has already been written. If all hosts defer a | |
2472 | general message is written at the end. */ | |
2473 | ||
2474 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL && | |
2475 | first_addr->basic_errno != ERRNO_TLSFAILURE) | |
2476 | write_logs(first_addr, host); | |
2477 | ||
2478 | /* If STARTTLS was accepted, but there was a failure in setting up the | |
2479 | TLS session (usually a certificate screwup), and the host is not in | |
2480 | hosts_require_tls, and tls_tempfail_tryclear is true, try again, with | |
2481 | TLS forcibly turned off. We have to start from scratch with a new SMTP | |
2482 | connection. That's why the retry is done from here, not from within | |
2483 | smtp_deliver(). [Rejections of STARTTLS itself don't screw up the | |
2484 | session, so the in-clear transmission after those errors, if permitted, | |
2485 | happens inside smtp_deliver().] */ | |
2486 | ||
2487 | #ifdef SUPPORT_TLS | |
2488 | if (rc == DEFER && first_addr->basic_errno == ERRNO_TLSFAILURE && | |
2489 | ob->tls_tempfail_tryclear && | |
2490 | verify_check_this_host(&(ob->hosts_require_tls), NULL, host->name, | |
2491 | host->address, NULL) != OK) | |
2492 | { | |
2493 | log_write(0, LOG_MAIN, "TLS session failure: delivering unencrypted " | |
2494 | "to %s [%s] (not in hosts_require_tls)", host->name, host->address); | |
2495 | first_addr = prepare_addresses(addrlist, host); | |
2496 | rc = smtp_deliver(addrlist, host, host_af, port, interface, tblock, | |
2497 | expanded_hosts != NULL, &message_defer, TRUE); | |
2498 | if (rc == DEFER && first_addr->basic_errno != ERRNO_AUTHFAIL) | |
2499 | write_logs(first_addr, host); | |
2500 | } | |
2501 | #endif | |
2502 | } | |
2503 | ||
2504 | /* Delivery attempt finished */ | |
2505 | ||
2506 | rs = (rc == OK)? US"OK" : (rc == DEFER)? US"DEFER" : (rc == ERROR)? | |
2507 | US"ERROR" : US"?"; | |
2508 | ||
2509 | set_process_info("delivering %s: just tried %s [%s] for %s%s: result %s", | |
2510 | message_id, host->name, host->address, addrlist->address, | |
2511 | (addrlist->next == NULL)? "" : " (& others)", rs); | |
2512 | ||
2513 | /* Release serialization if set up */ | |
2514 | ||
2515 | if (serialized) enq_end(serialize_key); | |
2516 | ||
2517 | /* If the result is DEFER, or if a host retry record is known to exist, we | |
2518 | need to add an item to the retry chain for updating the retry database | |
2519 | at the end of delivery. We only need to add the item to the top address, | |
2520 | of course. Also, if DEFER, we mark the IP address unusable so as to skip it | |
2521 | for any other delivery attempts using the same address. (It is copied into | |
2522 | the unusable tree at the outer level, so even if different address blocks | |
2523 | contain the same address, it still won't get tried again.) */ | |
2524 | ||
2525 | if (rc == DEFER || retry_host_key != NULL) | |
2526 | { | |
2527 | int delete_flag = (rc != DEFER)? rf_delete : 0; | |
2528 | if (retry_host_key == NULL) | |
2529 | { | |
2530 | retry_host_key = ob->retry_include_ip_address? | |
2531 | string_sprintf("T:%S:%s%s", host->name, host->address, pistring) : | |
2532 | string_sprintf("T:%S%s", host->name, pistring); | |
2533 | } | |
2534 | ||
2535 | /* If a delivery of another message over an existing SMTP connection | |
2536 | yields DEFER, we do NOT set up retry data for the host. This covers the | |
2537 | case when there are delays in routing the addresses in the second message | |
2538 | that are so long that the server times out. This is alleviated by not | |
2539 | routing addresses that previously had routing defers when handling an | |
2540 | existing connection, but even so, this case may occur (e.g. if a | |
2541 | previously happily routed address starts giving routing defers). If the | |
2542 | host is genuinely down, another non-continued message delivery will | |
2543 | notice it soon enough. */ | |
2544 | ||
2545 | if (delete_flag != 0 || !continuing) | |
2546 | retry_add_item(first_addr, retry_host_key, rf_host | delete_flag); | |
2547 | ||
2548 | /* We may have tried an expired host, if its retry time has come; ensure | |
2549 | the status reflects the expiry for the benefit of any other addresses. */ | |
2550 | ||
2551 | if (rc == DEFER) | |
2552 | { | |
2553 | host->status = (host_is_expired)? | |
2554 | hstatus_unusable_expired : hstatus_unusable; | |
2555 | host->why = hwhy_deferred; | |
2556 | } | |
2557 | } | |
2558 | ||
2559 | /* If message_defer is set (host was OK, but every recipient got deferred | |
2560 | because of some message-specific problem), or if that had happened | |
2561 | previously so that a message retry key exists, add an appropriate item | |
2562 | to the retry chain. Note that if there was a message defer but now there is | |
2563 | a host defer, the message defer record gets deleted. That seems perfectly | |
2564 | reasonable. Also, stop the message from being remembered as waiting | |
2565 | for this host. */ | |
2566 | ||
2567 | if (message_defer || retry_message_key != NULL) | |
2568 | { | |
2569 | int delete_flag = message_defer? 0 : rf_delete; | |
2570 | if (retry_message_key == NULL) | |
2571 | { | |
2572 | retry_message_key = ob->retry_include_ip_address? | |
2573 | string_sprintf("T:%S:%s%s:%s", host->name, host->address, pistring, | |
2574 | message_id) : | |
2575 | string_sprintf("T:%S%s:%s", host->name, pistring, message_id); | |
2576 | } | |
2577 | retry_add_item(addrlist, retry_message_key, | |
2578 | rf_message | rf_host | delete_flag); | |
2579 | host->update_waiting = FALSE; | |
2580 | } | |
2581 | ||
2582 | /* Any return other than DEFER (that is, OK or ERROR) means that the | |
2583 | addresses have got their final statuses filled in for this host. In the OK | |
2584 | case, see if any of them are deferred. */ | |
2585 | ||
2586 | if (rc == OK) | |
2587 | { | |
2588 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2589 | { | |
2590 | if (addr->transport_return == DEFER) | |
2591 | { | |
2592 | some_deferred = TRUE; | |
2593 | break; | |
2594 | } | |
2595 | } | |
2596 | } | |
2597 | ||
2598 | /* If no addresses deferred or the result was ERROR, return. We do this for | |
2599 | ERROR because a failing filter set-up or add_headers expansion is likely to | |
2600 | fail for any host we try. */ | |
2601 | ||
2602 | if (rc == ERROR || (rc == OK && !some_deferred)) | |
2603 | { | |
2604 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
2605 | return TRUE; /* Each address has its status */ | |
2606 | } | |
2607 | ||
2608 | /* If the result was DEFER or some individual addresses deferred, let | |
2609 | the loop run to try other hosts with the deferred addresses, except for the | |
2610 | case when we were trying to deliver down an existing channel and failed. | |
2611 | Don't try any other hosts in this case. */ | |
2612 | ||
2613 | if (continuing) break; | |
2614 | ||
2615 | /* If the whole delivery, or some individual addresses, were deferred and | |
2616 | there are more hosts that could be tried, do not count this host towards | |
2617 | the hosts_max_try limit if the age of the message is greater than the | |
2618 | maximum retry time for this host. This means we may try try all hosts, | |
2619 | ignoring the limit, when messages have been around for some time. This is | |
2620 | important because if we don't try all hosts, the address will never time | |
533244af | 2621 | out. NOTE: this does not apply to hosts_max_try_hardlimit. */ |
0756eb3c PH |
2622 | |
2623 | if ((rc == DEFER || some_deferred) && nexthost != NULL) | |
2624 | { | |
2625 | BOOL timedout; | |
2626 | retry_config *retry = retry_find_config(host->name, NULL, 0, 0); | |
2627 | ||
2628 | if (retry != NULL && retry->rules != NULL) | |
2629 | { | |
2630 | retry_rule *last_rule; | |
2631 | for (last_rule = retry->rules; | |
2632 | last_rule->next != NULL; | |
2633 | last_rule = last_rule->next); | |
2634 | timedout = time(NULL) - received_time > last_rule->timeout; | |
2635 | } | |
2636 | else timedout = TRUE; /* No rule => timed out */ | |
2637 | ||
2638 | if (timedout) | |
2639 | { | |
2640 | unexpired_hosts_tried--; | |
2641 | DEBUG(D_transport) debug_printf("temporary delivery error(s) override " | |
2642 | "hosts_max_try (message older than host's retry time)\n"); | |
2643 | } | |
2644 | } | |
2645 | } /* End of loop for trying multiple hosts. */ | |
2646 | ||
2647 | /* This is the end of the loop that repeats iff expired is TRUE and | |
2648 | ob->delay_after_cutoff is FALSE. The second time round we will | |
2649 | try those hosts that haven't been tried since the message arrived. */ | |
2650 | ||
2651 | DEBUG(D_transport) | |
2652 | { | |
2653 | debug_printf("all IP addresses skipped or deferred at least one address\n"); | |
2654 | if (expired && !ob->delay_after_cutoff && cutoff_retry == 0) | |
2655 | debug_printf("retrying IP addresses not tried since message arrived\n"); | |
2656 | } | |
2657 | } | |
2658 | ||
2659 | ||
2660 | /* Get here if all IP addresses are skipped or defer at least one address. In | |
2661 | MUA wrapper mode, this will happen only for connection or other non-message- | |
2662 | specific failures. Force the delivery status for all addresses to FAIL. */ | |
2663 | ||
2664 | if (mua_wrapper) | |
2665 | { | |
2666 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2667 | addr->transport_return = FAIL; | |
2668 | goto END_TRANSPORT; | |
2669 | } | |
2670 | ||
2671 | /* In the normal, non-wrapper case, add a standard message to each deferred | |
2672 | address if there hasn't been an error, that is, if it hasn't actually been | |
2673 | tried this time. The variable "expired" will be FALSE if any deliveries were | |
2674 | actually tried, or if there was at least one host that was not expired. That | |
2675 | is, it is TRUE only if no deliveries were tried and all hosts were expired. If | |
2676 | a delivery has been tried, an error code will be set, and the failing of the | |
2677 | message is handled by the retry code later. | |
2678 | ||
2679 | If queue_smtp is set, or this transport was called to send a subsequent message | |
2680 | down an existing TCP/IP connection, and something caused the host not to be | |
2681 | found, we end up here, but can detect these cases and handle them specially. */ | |
2682 | ||
2683 | for (addr = addrlist; addr != NULL; addr = addr->next) | |
2684 | { | |
2685 | /* If host is not NULL, it means that we stopped processing the host list | |
533244af PH |
2686 | because of hosts_max_try or hosts_max_try_hardlimit. In the former case, this |
2687 | means we need to behave as if some hosts were skipped because their retry | |
2688 | time had not come. Specifically, this prevents the address from timing out. | |
2689 | However, if we have hit hosts_max_try_hardlimit, we want to behave as if all | |
2690 | hosts were tried. */ | |
0756eb3c PH |
2691 | |
2692 | if (host != NULL) | |
2693 | { | |
533244af PH |
2694 | if (total_hosts_tried >= ob->hosts_max_try_hardlimit) |
2695 | { | |
2696 | DEBUG(D_transport) | |
2697 | debug_printf("hosts_max_try_hardlimit reached: behave as if all " | |
2698 | "hosts were tried\n"); | |
2699 | } | |
2700 | else | |
2701 | { | |
2702 | DEBUG(D_transport) | |
2703 | debug_printf("hosts_max_try limit caused some hosts to be skipped\n"); | |
2704 | setflag(addr, af_retry_skipped); | |
2705 | } | |
0756eb3c PH |
2706 | } |
2707 | ||
2708 | if (queue_smtp) /* no deliveries attempted */ | |
2709 | { | |
2710 | addr->transport_return = DEFER; | |
2711 | addr->basic_errno = 0; | |
2712 | addr->message = US"SMTP delivery explicitly queued"; | |
2713 | } | |
2714 | ||
2715 | else if (addr->transport_return == DEFER && | |
2716 | (addr->basic_errno == ERRNO_UNKNOWNERROR || addr->basic_errno == 0) && | |
2717 | addr->message == NULL) | |
2718 | { | |
2719 | addr->basic_errno = ERRNO_HRETRY; | |
2720 | if (continue_hostname != NULL) | |
2721 | { | |
2722 | addr->message = US"no host found for existing SMTP connection"; | |
2723 | } | |
2724 | else if (expired) | |
2725 | { | |
2726 | addr->message = (ob->delay_after_cutoff)? | |
2727 | US"retry time not reached for any host after a long failure period" : | |
2728 | US"all hosts have been failing for a long time and were last tried " | |
2729 | "after this message arrived"; | |
2730 | ||
2731 | /* If we are already using fallback hosts, or there are no fallback hosts | |
2732 | defined, convert the result to FAIL to cause a bounce. */ | |
2733 | ||
2734 | if (addr->host_list == addr->fallback_hosts || | |
2735 | addr->fallback_hosts == NULL) | |
2736 | addr->transport_return = FAIL; | |
2737 | } | |
2738 | else | |
2739 | { | |
2740 | if (hosts_retry == hosts_total) | |
2741 | addr->message = US"retry time not reached for any host"; | |
2742 | else if (hosts_fail == hosts_total) | |
2743 | addr->message = US"all host address lookups failed permanently"; | |
2744 | else if (hosts_defer == hosts_total) | |
2745 | addr->message = US"all host address lookups failed temporarily"; | |
2746 | else if (hosts_serial == hosts_total) | |
2747 | addr->message = US"connection limit reached for all hosts"; | |
2748 | else if (hosts_fail+hosts_defer == hosts_total) | |
2749 | addr->message = US"all host address lookups failed"; | |
2750 | else addr->message = US"some host address lookups failed and retry time " | |
2751 | "not reached for other hosts or connection limit reached"; | |
2752 | } | |
2753 | } | |
2754 | } | |
2755 | ||
2756 | /* Update the database which keeps information about which messages are waiting | |
2757 | for which hosts to become available. Each host in the list has a flag which is | |
2758 | set if the data is to be updated. For some message-specific errors, the flag is | |
2759 | turned off because we don't want follow-on deliveries in those cases. */ | |
2760 | ||
2761 | transport_update_waiting(hostlist, tblock->name); | |
2762 | ||
2763 | END_TRANSPORT: | |
2764 | ||
2765 | DEBUG(D_transport) debug_printf("Leaving %s transport\n", tblock->name); | |
2766 | ||
2767 | return TRUE; /* Each address has its status */ | |
2768 | } | |
2769 | ||
2770 | /* End of transport/smtp.c */ |