Commit | Line | Data |
---|---|---|
0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
3386088d | 5 | /* Copyright (c) University of Cambridge 1995 - 2015 */ |
0756eb3c PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | ||
9 | #include "../exim.h" | |
10 | #include "pipe.h" | |
11 | ||
79378e0f | 12 | #ifdef HAVE_SETCLASSRESOURCES |
929ba01c PH |
13 | #include <login_cap.h> |
14 | #endif | |
15 | ||
0756eb3c PH |
16 | |
17 | ||
18 | /* Options specific to the pipe transport. They must be in alphabetic | |
19 | order (note that "_" comes before the lower case letters). Those starting | |
20 | with "*" are not settable by the user but are used by the option-reading | |
21 | software for alternative value types. Some options are stored in the transport | |
22 | instance block so as to be publicly visible; these are flagged with opt_public. | |
23 | */ | |
24 | ||
25 | optionlist pipe_transport_options[] = { | |
26 | { "allow_commands", opt_stringptr, | |
27 | (void *)offsetof(pipe_transport_options_block, allow_commands) }, | |
28 | { "batch_id", opt_stringptr | opt_public, | |
29 | (void *)offsetof(transport_instance, batch_id) }, | |
30 | { "batch_max", opt_int | opt_public, | |
31 | (void *)offsetof(transport_instance, batch_max) }, | |
32 | { "check_string", opt_stringptr, | |
33 | (void *)offsetof(pipe_transport_options_block, check_string) }, | |
34 | { "command", opt_stringptr, | |
35 | (void *)offsetof(pipe_transport_options_block, cmd) }, | |
36 | { "environment", opt_stringptr, | |
37 | (void *)offsetof(pipe_transport_options_block, environment) }, | |
38 | { "escape_string", opt_stringptr, | |
39 | (void *)offsetof(pipe_transport_options_block, escape_string) }, | |
09792322 NK |
40 | { "force_command", opt_bool, |
41 | (void *)offsetof(pipe_transport_options_block, force_command) }, | |
0756eb3c PH |
42 | { "freeze_exec_fail", opt_bool, |
43 | (void *)offsetof(pipe_transport_options_block, freeze_exec_fail) }, | |
2fe76745 PP |
44 | { "freeze_signal", opt_bool, |
45 | (void *)offsetof(pipe_transport_options_block, freeze_signal) }, | |
0756eb3c PH |
46 | { "ignore_status", opt_bool, |
47 | (void *)offsetof(pipe_transport_options_block, ignore_status) }, | |
48 | { "log_defer_output", opt_bool | opt_public, | |
49 | (void *)offsetof(transport_instance, log_defer_output) }, | |
50 | { "log_fail_output", opt_bool | opt_public, | |
51 | (void *)offsetof(transport_instance, log_fail_output) }, | |
52 | { "log_output", opt_bool | opt_public, | |
53 | (void *)offsetof(transport_instance, log_output) }, | |
54 | { "max_output", opt_mkint, | |
55 | (void *)offsetof(pipe_transport_options_block, max_output) }, | |
56 | { "message_prefix", opt_stringptr, | |
57 | (void *)offsetof(pipe_transport_options_block, message_prefix) }, | |
58 | { "message_suffix", opt_stringptr, | |
59 | (void *)offsetof(pipe_transport_options_block, message_suffix) }, | |
60 | { "path", opt_stringptr, | |
61 | (void *)offsetof(pipe_transport_options_block, path) }, | |
a29e5231 PP |
62 | { "permit_coredump", opt_bool, |
63 | (void *)offsetof(pipe_transport_options_block, permit_coredump) }, | |
0756eb3c PH |
64 | { "pipe_as_creator", opt_bool | opt_public, |
65 | (void *)offsetof(transport_instance, deliver_as_creator) }, | |
66 | { "restrict_to_path", opt_bool, | |
67 | (void *)offsetof(pipe_transport_options_block, restrict_to_path) }, | |
68 | { "return_fail_output",opt_bool | opt_public, | |
69 | (void *)offsetof(transport_instance, return_fail_output) }, | |
70 | { "return_output", opt_bool | opt_public, | |
71 | (void *)offsetof(transport_instance, return_output) }, | |
72 | { "temp_errors", opt_stringptr, | |
73 | (void *)offsetof(pipe_transport_options_block, temp_errors) }, | |
74 | { "timeout", opt_time, | |
75 | (void *)offsetof(pipe_transport_options_block, timeout) }, | |
2e2a30b4 PH |
76 | { "timeout_defer", opt_bool, |
77 | (void *)offsetof(pipe_transport_options_block, timeout_defer) }, | |
0756eb3c PH |
78 | { "umask", opt_octint, |
79 | (void *)offsetof(pipe_transport_options_block, umask) }, | |
80 | { "use_bsmtp", opt_bool, | |
81 | (void *)offsetof(pipe_transport_options_block, use_bsmtp) }, | |
79378e0f | 82 | #ifdef HAVE_SETCLASSRESOURCES |
929ba01c PH |
83 | { "use_classresources", opt_bool, |
84 | (void *)offsetof(pipe_transport_options_block, use_classresources) }, | |
85 | #endif | |
0756eb3c PH |
86 | { "use_crlf", opt_bool, |
87 | (void *)offsetof(pipe_transport_options_block, use_crlf) }, | |
88 | { "use_shell", opt_bool, | |
89 | (void *)offsetof(pipe_transport_options_block, use_shell) }, | |
90 | }; | |
91 | ||
92 | /* Size of the options list. An extern variable has to be used so that its | |
93 | address can appear in the tables drtables.c. */ | |
94 | ||
95 | int pipe_transport_options_count = | |
96 | sizeof(pipe_transport_options)/sizeof(optionlist); | |
97 | ||
98 | /* Default private options block for the pipe transport. */ | |
99 | ||
100 | pipe_transport_options_block pipe_transport_option_defaults = { | |
101 | NULL, /* cmd */ | |
102 | NULL, /* allow_commands */ | |
103 | NULL, /* environment */ | |
cb741023 | 104 | US"/bin:/usr/bin", /* path */ |
0756eb3c PH |
105 | NULL, /* message_prefix (reset in init if not bsmtp) */ |
106 | NULL, /* message_suffix (ditto) */ | |
107 | US mac_expanded_string(EX_TEMPFAIL) ":" /* temp_errors */ | |
108 | mac_expanded_string(EX_CANTCREAT), | |
109 | NULL, /* check_string */ | |
110 | NULL, /* escape_string */ | |
111 | 022, /* umask */ | |
112 | 20480, /* max_output */ | |
113 | 60*60, /* timeout */ | |
114 | 0, /* options */ | |
09792322 | 115 | FALSE, /* force_command */ |
0756eb3c | 116 | FALSE, /* freeze_exec_fail */ |
2fe76745 | 117 | FALSE, /* freeze_signal */ |
0756eb3c | 118 | FALSE, /* ignore_status */ |
a29e5231 | 119 | FALSE, /* permit_coredump */ |
0756eb3c | 120 | FALSE, /* restrict_to_path */ |
2e2a30b4 | 121 | FALSE, /* timeout_defer */ |
0756eb3c PH |
122 | FALSE, /* use_shell */ |
123 | FALSE, /* use_bsmtp */ | |
929ba01c | 124 | FALSE, /* use_classresources */ |
0756eb3c PH |
125 | FALSE /* use_crlf */ |
126 | }; | |
127 | ||
128 | ||
129 | ||
929ba01c PH |
130 | /************************************************* |
131 | * Setup entry point * | |
132 | *************************************************/ | |
133 | ||
134 | /* Called for each delivery in the privileged state, just before the uid/gid | |
135 | are changed and the main entry point is called. In a system that supports the | |
136 | login_cap facilities, this function is used to set the class resource limits | |
a29e5231 | 137 | for the user. It may also re-enable coredumps. |
929ba01c PH |
138 | |
139 | Arguments: | |
140 | tblock points to the transport instance | |
141 | addrlist addresses about to be delivered (not used) | |
142 | dummy not used (doesn't pass back data) | |
143 | uid the uid that will be set (not used) | |
144 | gid the gid that will be set (not used) | |
145 | errmsg where to put an error message | |
146 | ||
147 | Returns: OK, FAIL, or DEFER | |
148 | */ | |
149 | ||
150 | static int | |
151 | pipe_transport_setup(transport_instance *tblock, address_item *addrlist, | |
152 | transport_feedback *dummy, uid_t uid, gid_t gid, uschar **errmsg) | |
153 | { | |
154 | pipe_transport_options_block *ob = | |
155 | (pipe_transport_options_block *)(tblock->options_block); | |
156 | ||
157 | addrlist = addrlist; /* Keep compiler happy */ | |
158 | dummy = dummy; | |
159 | uid = uid; | |
160 | gid = gid; | |
161 | errmsg = errmsg; | |
162 | ob = ob; | |
163 | ||
79378e0f | 164 | #ifdef HAVE_SETCLASSRESOURCES |
929ba01c PH |
165 | if (ob->use_classresources) |
166 | { | |
167 | struct passwd *pw = getpwuid(uid); | |
168 | if (pw != NULL) | |
169 | { | |
170 | login_cap_t *lc = login_getpwclass(pw); | |
171 | if (lc != NULL) | |
172 | { | |
173 | setclassresources(lc); | |
174 | login_close(lc); | |
175 | } | |
176 | } | |
177 | } | |
178 | #endif | |
179 | ||
a29e5231 PP |
180 | #ifdef RLIMIT_CORE |
181 | if (ob->permit_coredump) | |
182 | { | |
183 | struct rlimit rl; | |
184 | rl.rlim_cur = RLIM_INFINITY; | |
185 | rl.rlim_max = RLIM_INFINITY; | |
186 | if (setrlimit(RLIMIT_CORE, &rl) < 0) | |
187 | { | |
188 | #ifdef SETRLIMIT_NOT_SUPPORTED | |
189 | if (errno != ENOSYS && errno != ENOTSUP) | |
190 | #endif | |
191 | log_write(0, LOG_MAIN, | |
762ca6f3 | 192 | "delivery setrlimit(RLIMIT_CORE, RLIM_INFINITY) failed: %s", |
a29e5231 PP |
193 | strerror(errno)); |
194 | } | |
195 | } | |
196 | #endif | |
197 | ||
929ba01c PH |
198 | return OK; |
199 | } | |
200 | ||
201 | ||
202 | ||
0756eb3c PH |
203 | /************************************************* |
204 | * Initialization entry point * | |
205 | *************************************************/ | |
206 | ||
207 | /* Called for each instance, after its options have been read, to | |
208 | enable consistency checks to be done, or anything else that needs | |
209 | to be set up. */ | |
210 | ||
211 | void | |
212 | pipe_transport_init(transport_instance *tblock) | |
213 | { | |
214 | pipe_transport_options_block *ob = | |
215 | (pipe_transport_options_block *)(tblock->options_block); | |
216 | ||
929ba01c PH |
217 | /* Set up the setup entry point, to be called in the privileged state */ |
218 | ||
219 | tblock->setup = pipe_transport_setup; | |
220 | ||
0756eb3c PH |
221 | /* If pipe_as_creator is set, then uid/gid should not be set. */ |
222 | ||
223 | if (tblock->deliver_as_creator && (tblock->uid_set || tblock->gid_set || | |
224 | tblock->expand_uid != NULL || tblock->expand_gid != NULL)) | |
225 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
226 | "both pipe_as_creator and an explicit uid/gid are set for the %s " | |
227 | "transport", tblock->name); | |
228 | ||
229 | /* If a fixed uid field is set, then a gid field must also be set. */ | |
230 | ||
231 | if (tblock->uid_set && !tblock->gid_set && tblock->expand_gid == NULL) | |
232 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
233 | "user set without group for the %s transport", tblock->name); | |
234 | ||
235 | /* Temp_errors must consist only of digits and colons, but there can be | |
236 | spaces round the colons, so allow them too. */ | |
237 | ||
238 | if (ob->temp_errors != NULL && Ustrcmp(ob->temp_errors, "*") != 0) | |
239 | { | |
240 | size_t p = Ustrspn(ob->temp_errors, "0123456789: "); | |
241 | if (ob->temp_errors[p] != 0) | |
242 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
243 | "temp_errors must be a list of numbers or an asterisk for the %s " | |
244 | "transport", tblock->name); | |
245 | } | |
246 | ||
247 | /* Only one of return_output/return_fail_output or log_output/log_fail_output | |
248 | should be set. */ | |
249 | ||
250 | if (tblock->return_output && tblock->return_fail_output) | |
251 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
252 | "both return_output and return_fail_output set for %s transport", | |
253 | tblock->name); | |
254 | ||
255 | if (tblock->log_output && tblock->log_fail_output) | |
256 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
257 | "both log_output and log_fail_output set for the %s transport", | |
258 | tblock->name); | |
259 | ||
260 | /* If batch SMTP is set, force the check and escape strings, and arrange that | |
261 | headers are also escaped. */ | |
262 | ||
263 | if (ob->use_bsmtp) | |
264 | { | |
265 | ob->check_string = US"."; | |
266 | ob->escape_string = US".."; | |
267 | ob->options |= topt_escape_headers; | |
268 | } | |
269 | ||
270 | /* If not batch SMTP, and message_prefix or message_suffix are unset, insert | |
271 | default values for them. */ | |
272 | ||
273 | else | |
274 | { | |
275 | if (ob->message_prefix == NULL) ob->message_prefix = | |
276 | US"From ${if def:return_path{$return_path}{MAILER-DAEMON}} ${tod_bsdinbox}\n"; | |
277 | if (ob->message_suffix == NULL) ob->message_suffix = US"\n"; | |
278 | } | |
279 | ||
280 | /* The restrict_to_path and use_shell options are incompatible */ | |
281 | ||
282 | if (ob->restrict_to_path && ob->use_shell) | |
283 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
284 | "both restrict_to_path and use_shell set for %s transport", | |
285 | tblock->name); | |
286 | ||
287 | /* The allow_commands and use_shell options are incompatible */ | |
288 | ||
289 | if (ob->allow_commands && ob->use_shell) | |
290 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG, | |
291 | "both allow_commands and use_shell set for %s transport", | |
292 | tblock->name); | |
293 | ||
294 | /* Set up the bitwise options for transport_write_message from the various | |
295 | driver options. Only one of body_only and headers_only can be set. */ | |
296 | ||
297 | ob->options |= | |
298 | (tblock->body_only? topt_no_headers : 0) | | |
299 | (tblock->headers_only? topt_no_body : 0) | | |
300 | (tblock->return_path_add? topt_add_return_path : 0) | | |
301 | (tblock->delivery_date_add? topt_add_delivery_date : 0) | | |
302 | (tblock->envelope_to_add? topt_add_envelope_to : 0) | | |
303 | (ob->use_crlf? topt_use_crlf : 0); | |
304 | } | |
305 | ||
306 | ||
307 | ||
308 | /************************************************* | |
309 | * Set up direct (non-shell) command * | |
310 | *************************************************/ | |
311 | ||
312 | /* This function is called when a command line is to be parsed by the transport | |
313 | and executed directly, without the use of /bin/sh. | |
314 | ||
315 | Arguments: | |
316 | argvptr pointer to anchor for argv vector | |
317 | cmd points to the command string | |
318 | expand_arguments true if expansion is to occur | |
319 | expand_fail error if expansion fails | |
320 | addr chain of addresses | |
321 | tname the transport name | |
322 | ob the transport options block | |
323 | ||
324 | Returns: TRUE if all went well; otherwise an error will be | |
325 | set in the first address and FALSE returned | |
326 | */ | |
327 | ||
328 | static BOOL | |
55414b25 JH |
329 | set_up_direct_command(const uschar ***argvptr, uschar *cmd, |
330 | BOOL expand_arguments, int expand_fail, address_item *addr, uschar *tname, | |
0756eb3c PH |
331 | pipe_transport_options_block *ob) |
332 | { | |
333 | BOOL permitted = FALSE; | |
55414b25 | 334 | const uschar **argv; |
0756eb3c PH |
335 | uschar buffer[64]; |
336 | ||
337 | /* Set up "transport <name>" to be put in any error messages, and then | |
338 | call the common function for creating an argument list and expanding | |
339 | the items if necessary. If it fails, this function fails (error information | |
340 | is in the addresses). */ | |
341 | ||
342 | sprintf(CS buffer, "%.50s transport", tname); | |
343 | if (!transport_set_up_command(argvptr, cmd, expand_arguments, expand_fail, | |
344 | addr, buffer, NULL)) | |
345 | return FALSE; | |
346 | ||
347 | /* Point to the set-up arguments. */ | |
348 | ||
349 | argv = *argvptr; | |
350 | ||
351 | /* If allow_commands is set, see if the command is in the permitted list. */ | |
352 | ||
353 | if (ob->allow_commands != NULL) | |
354 | { | |
355 | int sep = 0; | |
55414b25 JH |
356 | const uschar *s; |
357 | uschar *p; | |
0756eb3c PH |
358 | uschar buffer[256]; |
359 | ||
55414b25 | 360 | if (!(s = expand_string(ob->allow_commands))) |
0756eb3c PH |
361 | { |
362 | addr->transport_return = DEFER; | |
363 | addr->message = string_sprintf("failed to expand string \"%s\" " | |
364 | "for %s transport: %s", ob->allow_commands, tname, expand_string_message); | |
365 | return FALSE; | |
366 | } | |
367 | ||
55414b25 | 368 | while ((p = string_nextinlist(&s, &sep, buffer, sizeof(buffer)))) |
0756eb3c | 369 | if (Ustrcmp(p, argv[0]) == 0) { permitted = TRUE; break; } |
0756eb3c PH |
370 | } |
371 | ||
372 | /* If permitted is TRUE it means the command was found in the allowed list, and | |
373 | no further checks are done. If permitted = FALSE, it either means | |
374 | allow_commands wasn't set, or that the command didn't match anything in the | |
375 | list. In both cases, if restrict_to_path is set, we fail if the command | |
376 | contains any slashes, but if restrict_to_path is not set, we must fail the | |
377 | command only if allow_commands is set. */ | |
378 | ||
379 | if (!permitted) | |
380 | { | |
381 | if (ob->restrict_to_path) | |
382 | { | |
383 | if (Ustrchr(argv[0], '/') != NULL) | |
384 | { | |
385 | addr->transport_return = FAIL; | |
386 | addr->message = string_sprintf("\"/\" found in \"%s\" (command for %s " | |
387 | "transport) - failed for security reasons", cmd, tname); | |
388 | return FALSE; | |
389 | } | |
390 | } | |
391 | ||
392 | else if (ob->allow_commands != NULL) | |
393 | { | |
394 | addr->transport_return = FAIL; | |
395 | addr->message = string_sprintf("\"%s\" command not permitted by %s " | |
396 | "transport", argv[0], tname); | |
397 | return FALSE; | |
398 | } | |
399 | } | |
400 | ||
401 | /* If the command is not an absolute path, search the PATH directories | |
402 | for it. */ | |
403 | ||
404 | if (argv[0][0] != '/') | |
405 | { | |
406 | int sep = 0; | |
407 | uschar *p; | |
55414b25 | 408 | const uschar *listptr = ob->path; |
0756eb3c PH |
409 | uschar buffer[1024]; |
410 | ||
411 | while ((p = string_nextinlist(&listptr, &sep, buffer, sizeof(buffer))) != NULL) | |
412 | { | |
413 | struct stat statbuf; | |
414 | sprintf(CS big_buffer, "%.256s/%.256s", p, argv[0]); | |
415 | if (Ustat(big_buffer, &statbuf) == 0) | |
416 | { | |
417 | argv[0] = string_copy(big_buffer); | |
418 | break; | |
419 | } | |
420 | } | |
421 | if (p == NULL) | |
422 | { | |
423 | addr->transport_return = FAIL; | |
424 | addr->message = string_sprintf("\"%s\" command not found for %s transport", | |
425 | argv[0], tname); | |
426 | return FALSE; | |
427 | } | |
428 | } | |
429 | ||
430 | return TRUE; | |
431 | } | |
432 | ||
433 | ||
434 | /************************************************* | |
435 | * Set up shell command * | |
436 | *************************************************/ | |
437 | ||
438 | /* This function is called when a command line is to be passed to /bin/sh | |
439 | without parsing inside the transport. | |
440 | ||
441 | Arguments: | |
442 | argvptr pointer to anchor for argv vector | |
443 | cmd points to the command string | |
444 | expand_arguments true if expansion is to occur | |
445 | expand_fail error if expansion fails | |
446 | addr chain of addresses | |
447 | tname the transport name | |
448 | ||
449 | Returns: TRUE if all went well; otherwise an error will be | |
450 | set in the first address and FALSE returned | |
451 | */ | |
452 | ||
453 | static BOOL | |
55414b25 JH |
454 | set_up_shell_command(const uschar ***argvptr, uschar *cmd, |
455 | BOOL expand_arguments, int expand_fail, address_item *addr, uschar *tname) | |
0756eb3c | 456 | { |
55414b25 | 457 | const uschar **argv; |
0756eb3c PH |
458 | |
459 | *argvptr = argv = store_get((4)*sizeof(uschar *)); | |
460 | ||
461 | argv[0] = US"/bin/sh"; | |
462 | argv[1] = US"-c"; | |
463 | ||
464 | /* We have to take special action to handle the special "variable" called | |
465 | $pipe_addresses, which is not recognized by the normal expansion function. */ | |
466 | ||
467 | DEBUG(D_transport) | |
468 | debug_printf("shell pipe command before expansion:\n %s\n", cmd); | |
469 | ||
470 | if (expand_arguments) | |
471 | { | |
472 | uschar *s = cmd; | |
473 | uschar *p = Ustrstr(cmd, "pipe_addresses"); | |
474 | ||
475 | if (p != NULL && ( | |
476 | (p > cmd && p[-1] == '$') || | |
477 | (p > cmd + 1 && p[-2] == '$' && p[-1] == '{' && p[14] == '}'))) | |
478 | { | |
479 | address_item *ad; | |
480 | uschar *q = p + 14; | |
481 | int size = Ustrlen(cmd) + 64; | |
482 | int offset; | |
483 | ||
484 | if (p[-1] == '{') { q++; p--; } | |
485 | ||
486 | s = store_get(size); | |
487 | offset = p - cmd - 1; | |
488 | Ustrncpy(s, cmd, offset); | |
489 | ||
490 | for (ad = addr; ad != NULL; ad = ad->next) | |
491 | { | |
492 | if (ad != addr) string_cat(s, &size, &offset, US" ", 1); | |
493 | string_cat(s, &size, &offset, ad->address, Ustrlen(ad->address)); | |
494 | } | |
495 | ||
496 | string_cat(s, &size, &offset, q, Ustrlen(q)); | |
497 | s[offset] = 0; | |
498 | } | |
499 | ||
500 | /* Allow $recipients in the expansion iff it comes from a system filter */ | |
501 | ||
502 | enable_dollar_recipients = addr != NULL && | |
503 | addr->parent != NULL && | |
504 | Ustrcmp(addr->parent->address, "system-filter") == 0; | |
505 | argv[2] = expand_string(s); | |
506 | enable_dollar_recipients = FALSE; | |
507 | ||
508 | if (argv[2] == NULL) | |
509 | { | |
510 | addr->transport_return = search_find_defer? DEFER : expand_fail; | |
511 | addr->message = string_sprintf("Expansion of command \"%s\" " | |
512 | "in %s transport failed: %s", | |
513 | cmd, tname, expand_string_message); | |
514 | return FALSE; | |
515 | } | |
516 | ||
517 | DEBUG(D_transport) | |
518 | debug_printf("shell pipe command after expansion:\n %s\n", argv[2]); | |
519 | } | |
520 | else argv[2] = cmd; | |
521 | ||
522 | argv[3] = (uschar *)0; | |
523 | return TRUE; | |
524 | } | |
525 | ||
526 | ||
527 | ||
528 | ||
529 | /************************************************* | |
530 | * Main entry point * | |
531 | *************************************************/ | |
532 | ||
533 | /* See local README for interface details. This transport always returns FALSE, | |
534 | indicating that the status in the first address is the status for all addresses | |
535 | in a batch. */ | |
536 | ||
537 | BOOL | |
538 | pipe_transport_entry( | |
539 | transport_instance *tblock, /* data for this instantiation */ | |
540 | address_item *addr) /* address(es) we are working on */ | |
541 | { | |
542 | pid_t pid, outpid; | |
543 | int fd_in, fd_out, rc; | |
544 | int envcount = 0; | |
545 | int envsep = 0; | |
546 | int expand_fail; | |
547 | pipe_transport_options_block *ob = | |
548 | (pipe_transport_options_block *)(tblock->options_block); | |
549 | int timeout = ob->timeout; | |
550 | BOOL written_ok = FALSE; | |
551 | BOOL expand_arguments; | |
55414b25 | 552 | const uschar **argv; |
0756eb3c | 553 | uschar *envp[50]; |
55414b25 | 554 | const uschar *envlist = ob->environment; |
0756eb3c PH |
555 | uschar *cmd, *ss; |
556 | uschar *eol = (ob->use_crlf)? US"\r\n" : US"\n"; | |
557 | ||
558 | DEBUG(D_transport) debug_printf("%s transport entered\n", tblock->name); | |
559 | ||
560 | /* Set up for the good case */ | |
561 | ||
562 | addr->transport_return = OK; | |
563 | addr->basic_errno = 0; | |
564 | ||
565 | /* Pipes are not accepted as general addresses, but they can be generated from | |
566 | .forward files or alias files. In those cases, the pfr flag is set, and the | |
567 | command to be obeyed is pointed to by addr->local_part; it starts with the pipe | |
568 | symbol. In other cases, the command is supplied as one of the pipe transport's | |
569 | options. */ | |
570 | ||
571 | if (testflag(addr, af_pfr) && addr->local_part[0] == '|') | |
572 | { | |
700d22f3 PP |
573 | if (ob->force_command) |
574 | { | |
575 | /* Enables expansion of $address_pipe into seperate arguments */ | |
576 | setflag(addr, af_force_command); | |
577 | cmd = ob->cmd; | |
578 | expand_arguments = TRUE; | |
579 | expand_fail = PANIC; | |
580 | } | |
581 | else | |
582 | { | |
583 | cmd = addr->local_part + 1; | |
584 | while (isspace(*cmd)) cmd++; | |
585 | expand_arguments = testflag(addr, af_expand_pipe); | |
586 | expand_fail = FAIL; | |
09792322 | 587 | } |
0756eb3c PH |
588 | } |
589 | else | |
590 | { | |
591 | cmd = ob->cmd; | |
592 | expand_arguments = TRUE; | |
593 | expand_fail = PANIC; | |
594 | } | |
595 | ||
09792322 NK |
596 | /* If no command has been supplied, we are in trouble. |
597 | * We also check for an empty string since it may be | |
598 | * coming from addr->local_part[0] == '|' | |
599 | */ | |
0756eb3c | 600 | |
09792322 | 601 | if (cmd == NULL || *cmd == '\0') |
0756eb3c PH |
602 | { |
603 | addr->transport_return = DEFER; | |
604 | addr->message = string_sprintf("no command specified for %s transport", | |
605 | tblock->name); | |
606 | return FALSE; | |
607 | } | |
608 | ||
609 | /* When a pipe is set up by a filter file, there may be values for $thisaddress | |
610 | and numerical the variables in existence. These are passed in | |
611 | addr->pipe_expandn for use here. */ | |
612 | ||
613 | if (expand_arguments && addr->pipe_expandn != NULL) | |
614 | { | |
615 | uschar **ss = addr->pipe_expandn; | |
616 | expand_nmax = -1; | |
617 | if (*ss != NULL) filter_thisaddress = *ss++; | |
618 | while (*ss != NULL) | |
619 | { | |
620 | expand_nstring[++expand_nmax] = *ss; | |
621 | expand_nlength[expand_nmax] = Ustrlen(*ss++); | |
622 | } | |
623 | } | |
624 | ||
625 | /* The default way of processing the command is to split it up into arguments | |
626 | here, and run it directly. This offers some security advantages. However, there | |
627 | are installations that want by default to run commands under /bin/sh always, so | |
628 | there is an option to do that. */ | |
629 | ||
630 | if (ob->use_shell) | |
631 | { | |
632 | if (!set_up_shell_command(&argv, cmd, expand_arguments, expand_fail, addr, | |
633 | tblock->name)) return FALSE; | |
634 | } | |
635 | else if (!set_up_direct_command(&argv, cmd, expand_arguments, expand_fail, addr, | |
636 | tblock->name, ob)) return FALSE; | |
637 | ||
638 | expand_nmax = -1; /* Reset */ | |
639 | filter_thisaddress = NULL; | |
640 | ||
641 | /* Set up the environment for the command. */ | |
642 | ||
643 | envp[envcount++] = string_sprintf("LOCAL_PART=%s", deliver_localpart); | |
644 | envp[envcount++] = string_sprintf("LOGNAME=%s", deliver_localpart); | |
645 | envp[envcount++] = string_sprintf("USER=%s", deliver_localpart); | |
646 | envp[envcount++] = string_sprintf("LOCAL_PART_PREFIX=%#s", | |
647 | deliver_localpart_prefix); | |
648 | envp[envcount++] = string_sprintf("LOCAL_PART_SUFFIX=%#s", | |
649 | deliver_localpart_suffix); | |
650 | envp[envcount++] = string_sprintf("DOMAIN=%s", deliver_domain); | |
651 | envp[envcount++] = string_sprintf("HOME=%#s", deliver_home); | |
652 | envp[envcount++] = string_sprintf("MESSAGE_ID=%s", message_id); | |
653 | envp[envcount++] = string_sprintf("PATH=%s", ob->path); | |
654 | envp[envcount++] = string_sprintf("RECIPIENT=%#s%#s%#s@%#s", | |
655 | deliver_localpart_prefix, deliver_localpart, deliver_localpart_suffix, | |
656 | deliver_domain); | |
657 | envp[envcount++] = string_sprintf("QUALIFY_DOMAIN=%s", qualify_domain_sender); | |
658 | envp[envcount++] = string_sprintf("SENDER=%s", sender_address); | |
659 | envp[envcount++] = US"SHELL=/bin/sh"; | |
660 | ||
661 | if (addr->host_list != NULL) | |
662 | envp[envcount++] = string_sprintf("HOST=%s", addr->host_list->name); | |
663 | ||
664 | if (timestamps_utc) envp[envcount++] = US"TZ=UTC"; | |
665 | else if (timezone_string != NULL && timezone_string[0] != 0) | |
666 | envp[envcount++] = string_sprintf("TZ=%s", timezone_string); | |
667 | ||
668 | /* Add any requested items */ | |
669 | ||
55414b25 | 670 | if (envlist) |
0756eb3c | 671 | { |
55414b25 | 672 | envlist = expand_cstring(envlist); |
0756eb3c PH |
673 | if (envlist == NULL) |
674 | { | |
675 | addr->transport_return = DEFER; | |
676 | addr->message = string_sprintf("failed to expand string \"%s\" " | |
677 | "for %s transport: %s", ob->environment, tblock->name, | |
678 | expand_string_message); | |
679 | return FALSE; | |
680 | } | |
681 | } | |
682 | ||
683 | while ((ss = string_nextinlist(&envlist, &envsep, big_buffer, big_buffer_size)) | |
684 | != NULL) | |
685 | { | |
686 | if (envcount > sizeof(envp)/sizeof(uschar *) - 2) | |
687 | { | |
688 | addr->transport_return = DEFER; | |
689 | addr->message = string_sprintf("too many environment settings for " | |
690 | "%s transport", tblock->name); | |
691 | return FALSE; | |
692 | } | |
693 | envp[envcount++] = string_copy(ss); | |
694 | } | |
695 | ||
696 | envp[envcount] = NULL; | |
697 | ||
698 | /* If the -N option is set, can't do any more. */ | |
699 | ||
700 | if (dont_deliver) | |
701 | { | |
702 | DEBUG(D_transport) | |
703 | debug_printf("*** delivery by %s transport bypassed by -N option", | |
704 | tblock->name); | |
705 | return FALSE; | |
706 | } | |
707 | ||
708 | ||
709 | /* Handling the output from the pipe is tricky. If a file for catching this | |
710 | output is provided, we could in theory just hand that fd over to the process, | |
711 | but this isn't very safe because it might loop and carry on writing for | |
712 | ever (which is exactly what happened in early versions of Exim). Therefore we | |
713 | use the standard child_open() function, which creates pipes. We can then read | |
714 | our end of the output pipe and count the number of bytes that come through, | |
715 | chopping the sub-process if it exceeds some limit. | |
716 | ||
717 | However, this means we want to run a sub-process with both its input and output | |
718 | attached to pipes. We can't handle that easily from a single parent process | |
719 | using straightforward code such as the transport_write_message() function | |
720 | because the subprocess might not be reading its input because it is trying to | |
721 | write to a full output pipe. The complication of redesigning the world to | |
722 | handle this is too great - simpler just to run another process to do the | |
723 | reading of the output pipe. */ | |
724 | ||
725 | ||
726 | /* As this is a local transport, we are already running with the required | |
727 | uid/gid and current directory. Request that the new process be a process group | |
728 | leader, so we can kill it and all its children on a timeout. */ | |
729 | ||
55414b25 | 730 | if ((pid = child_open(USS argv, envp, ob->umask, &fd_in, &fd_out, TRUE)) < 0) |
0756eb3c PH |
731 | { |
732 | addr->transport_return = DEFER; | |
733 | addr->message = string_sprintf( | |
734 | "Failed to create child process for %s transport: %s", tblock->name, | |
735 | strerror(errno)); | |
736 | return FALSE; | |
737 | } | |
738 | ||
739 | /* Now fork a process to handle the output that comes down the pipe. */ | |
740 | ||
741 | if ((outpid = fork()) < 0) | |
742 | { | |
743 | addr->basic_errno = errno; | |
744 | addr->transport_return = DEFER; | |
745 | addr->message = string_sprintf( | |
746 | "Failed to create process for handling output in %s transport", | |
747 | tblock->name); | |
f1e894f3 PH |
748 | (void)close(fd_in); |
749 | (void)close(fd_out); | |
0756eb3c PH |
750 | return FALSE; |
751 | } | |
752 | ||
753 | /* This is the code for the output-handling subprocess. Read from the pipe | |
754 | in chunks, and write to the return file if one is provided. Keep track of | |
755 | the number of bytes handled. If the limit is exceeded, try to kill the | |
756 | subprocess group, and in any case close the pipe and exit, which should cause | |
757 | the subprocess to fail. */ | |
758 | ||
759 | if (outpid == 0) | |
760 | { | |
761 | int count = 0; | |
f1e894f3 | 762 | (void)close(fd_in); |
0756eb3c PH |
763 | set_process_info("reading output from |%s", cmd); |
764 | while ((rc = read(fd_out, big_buffer, big_buffer_size)) > 0) | |
765 | { | |
766 | if (addr->return_file >= 0) | |
1ac6b2e7 JH |
767 | if(write(addr->return_file, big_buffer, rc) != rc) |
768 | DEBUG(D_transport) debug_printf("Problem writing to return_file\n"); | |
0756eb3c PH |
769 | count += rc; |
770 | if (count > ob->max_output) | |
771 | { | |
0756eb3c PH |
772 | DEBUG(D_transport) debug_printf("Too much output from pipe - killed\n"); |
773 | if (addr->return_file >= 0) | |
1ac6b2e7 JH |
774 | { |
775 | uschar *message = US"\n\n*** Too much output - remainder discarded ***\n"; | |
776 | rc = Ustrlen(message); | |
777 | if(write(addr->return_file, message, rc) != rc) | |
778 | DEBUG(D_transport) debug_printf("Problem writing to return_file\n"); | |
779 | } | |
0756eb3c PH |
780 | killpg(pid, SIGKILL); |
781 | break; | |
782 | } | |
783 | } | |
f1e894f3 | 784 | (void)close(fd_out); |
0756eb3c PH |
785 | _exit(0); |
786 | } | |
787 | ||
f1e894f3 | 788 | (void)close(fd_out); /* Not used in this process */ |
0756eb3c PH |
789 | |
790 | ||
791 | /* Carrying on now with the main parent process. Attempt to write the message | |
792 | to it down the pipe. It is a fallacy to think that you can detect write errors | |
793 | when the sub-process fails to read the pipe. The parent process may complete | |
794 | writing and close the pipe before the sub-process completes. We could sleep a | |
795 | bit here to let the sub-process get going, but it may still not complete. So we | |
796 | ignore all writing errors. (When in the test harness, we do do a short sleep so | |
797 | any debugging output is likely to be in the same order.) */ | |
798 | ||
799 | if (running_in_test_harness) millisleep(500); | |
800 | ||
801 | DEBUG(D_transport) debug_printf("Writing message to pipe\n"); | |
802 | ||
803 | /* Arrange to time out writes if there is a timeout set. */ | |
804 | ||
805 | if (timeout > 0) | |
806 | { | |
807 | sigalrm_seen = FALSE; | |
808 | transport_write_timeout = timeout; | |
809 | } | |
810 | ||
811 | /* Reset the counter of bytes written */ | |
812 | ||
813 | transport_count = 0; | |
814 | ||
815 | /* First write any configured prefix information */ | |
816 | ||
817 | if (ob->message_prefix != NULL) | |
818 | { | |
819 | uschar *prefix = expand_string(ob->message_prefix); | |
820 | if (prefix == NULL) | |
821 | { | |
822 | addr->transport_return = search_find_defer? DEFER : PANIC; | |
823 | addr->message = string_sprintf("Expansion of \"%s\" (prefix for %s " | |
824 | "transport) failed: %s", ob->message_prefix, tblock->name, | |
825 | expand_string_message); | |
826 | return FALSE; | |
827 | } | |
828 | if (!transport_write_block(fd_in, prefix, Ustrlen(prefix))) | |
829 | goto END_WRITE; | |
830 | } | |
831 | ||
832 | /* If the use_bsmtp option is set, we need to write SMTP prefix information. | |
833 | The various different values for batching are handled outside; if there is more | |
834 | than one address available here, all must be included. Force SMTP dot-handling. | |
835 | */ | |
836 | ||
837 | if (ob->use_bsmtp) | |
838 | { | |
839 | address_item *a; | |
840 | ||
841 | if (!transport_write_string(fd_in, "MAIL FROM:<%s>%s", return_path, eol)) | |
842 | goto END_WRITE; | |
843 | ||
844 | for (a = addr; a != NULL; a = a->next) | |
845 | { | |
846 | if (!transport_write_string(fd_in, | |
847 | "RCPT TO:<%s>%s", | |
848 | transport_rcpt_address(a, tblock->rcpt_include_affixes), | |
849 | eol)) | |
850 | goto END_WRITE; | |
851 | } | |
852 | ||
853 | if (!transport_write_string(fd_in, "DATA%s", eol)) goto END_WRITE; | |
854 | } | |
855 | ||
856 | /* Now the actual message - the options were set at initialization time */ | |
857 | ||
858 | if (!transport_write_message(addr, fd_in, ob->options, 0, tblock->add_headers, | |
859 | tblock->remove_headers, ob->check_string, ob->escape_string, | |
860 | tblock->rewrite_rules, tblock->rewrite_existflags)) | |
861 | goto END_WRITE; | |
862 | ||
863 | /* Now any configured suffix */ | |
864 | ||
865 | if (ob->message_suffix != NULL) | |
866 | { | |
867 | uschar *suffix = expand_string(ob->message_suffix); | |
868 | if (suffix == NULL) | |
869 | { | |
870 | addr->transport_return = search_find_defer? DEFER : PANIC; | |
871 | addr->message = string_sprintf("Expansion of \"%s\" (suffix for %s " | |
872 | "transport) failed: %s", ob->message_suffix, tblock->name, | |
873 | expand_string_message); | |
874 | return FALSE; | |
875 | } | |
876 | if (!transport_write_block(fd_in, suffix, Ustrlen(suffix))) | |
877 | goto END_WRITE; | |
878 | } | |
879 | ||
880 | /* If local_smtp, write the terminating dot. */ | |
881 | ||
882 | if (ob->use_bsmtp && !transport_write_string(fd_in, ".%s", eol)) | |
883 | goto END_WRITE; | |
884 | ||
885 | /* Flag all writing completed successfully. */ | |
886 | ||
887 | written_ok = TRUE; | |
888 | ||
889 | /* Come here if there are errors during writing. */ | |
890 | ||
891 | END_WRITE: | |
892 | ||
893 | /* OK, the writing is now all done. Close the pipe. */ | |
894 | ||
895 | (void) close(fd_in); | |
896 | ||
897 | /* Handle errors during writing. For timeouts, set the timeout for waiting for | |
898 | the child process to 1 second. If the process at the far end of the pipe died | |
899 | without reading all of it, we expect an EPIPE error, which should be ignored. | |
900 | We used also to ignore WRITEINCOMPLETE but the writing function is now cleverer | |
901 | at handling OS where the death of a pipe doesn't give EPIPE immediately. See | |
2e2a30b4 | 902 | comments therein. */ |
0756eb3c PH |
903 | |
904 | if (!written_ok) | |
905 | { | |
906 | if (errno == ETIMEDOUT) | |
2e2a30b4 PH |
907 | { |
908 | addr->message = string_sprintf("%stimeout while writing to pipe", | |
909 | transport_filter_timed_out? "transport filter " : ""); | |
910 | addr->transport_return = ob->timeout_defer? DEFER : FAIL; | |
0756eb3c | 911 | timeout = 1; |
2e2a30b4 PH |
912 | } |
913 | else if (errno == EPIPE) | |
0756eb3c | 914 | { |
2e2a30b4 | 915 | debug_printf("transport error EPIPE ignored\n"); |
0756eb3c PH |
916 | } |
917 | else | |
918 | { | |
8e669ac1 | 919 | addr->transport_return = PANIC; |
0756eb3c PH |
920 | addr->basic_errno = errno; |
921 | if (errno == ERRNO_CHHEADER_FAIL) | |
922 | addr->message = | |
923 | string_sprintf("Failed to expand headers_add or headers_remove: %s", | |
924 | expand_string_message); | |
925 | else if (errno == ERRNO_FILTER_FAIL) | |
35af9f61 PH |
926 | addr->message = string_sprintf("Transport filter process failed (%d)%s", |
927 | addr->more_errno, | |
928 | (addr->more_errno == EX_EXECFAILED)? ": unable to execute command" : ""); | |
0756eb3c PH |
929 | else if (errno == ERRNO_WRITEINCOMPLETE) |
930 | addr->message = string_sprintf("Failed repeatedly to write data"); | |
931 | else | |
932 | addr->message = string_sprintf("Error %d", errno); | |
933 | return FALSE; | |
934 | } | |
935 | } | |
936 | ||
937 | /* Wait for the child process to complete and take action if the returned | |
938 | status is nonzero. The timeout will be just 1 second if any of the writes | |
939 | above timed out. */ | |
940 | ||
941 | if ((rc = child_close(pid, timeout)) != 0) | |
942 | { | |
22c3b60b PH |
943 | uschar *tmsg = (addr->message == NULL)? US"" : |
944 | string_sprintf(" (preceded by %s)", addr->message); | |
945 | ||
0756eb3c PH |
946 | /* The process did not complete in time; kill its process group and fail |
947 | the delivery. It appears to be necessary to kill the output process too, as | |
948 | otherwise it hangs on for some time if the actual pipe process is sleeping. | |
949 | (At least, that's what I observed on Solaris 2.5.1.) Since we are failing | |
950 | the delivery, that shouldn't cause any problem. */ | |
951 | ||
952 | if (rc == -256) | |
953 | { | |
954 | killpg(pid, SIGKILL); | |
955 | kill(outpid, SIGKILL); | |
2e2a30b4 | 956 | addr->transport_return = ob->timeout_defer? DEFER : FAIL; |
22c3b60b | 957 | addr->message = string_sprintf("pipe delivery process timed out%s", tmsg); |
0756eb3c PH |
958 | } |
959 | ||
960 | /* Wait() failed. */ | |
961 | ||
962 | else if (rc == -257) | |
963 | { | |
964 | addr->transport_return = PANIC; | |
965 | addr->message = string_sprintf("Wait() failed for child process of %s " | |
22c3b60b | 966 | "transport: %s%s", tblock->name, strerror(errno), tmsg); |
0756eb3c PH |
967 | } |
968 | ||
52383f8f NM |
969 | /* Since the transport_filter timed out we assume it has sent the child process |
970 | a malformed or incomplete data stream. Kill off the child process | |
971 | and prevent checking its exit status as it will has probably exited in error. | |
972 | This prevents the transport_filter timeout message from getting overwritten | |
973 | by the exit error which is not the cause of the problem. */ | |
974 | ||
975 | else if (transport_filter_timed_out) | |
976 | { | |
977 | killpg(pid, SIGKILL); | |
978 | kill(outpid, SIGKILL); | |
979 | } | |
980 | ||
0756eb3c PH |
981 | /* Either the process completed, but yielded a non-zero (necessarily |
982 | positive) status, or the process was terminated by a signal (rc will contain | |
983 | the negation of the signal number). Treat killing by signal as failure unless | |
2fe76745 PP |
984 | status is being ignored. By default, the message is bounced back, unless |
985 | freeze_signal is set, in which case it is frozen instead. */ | |
0756eb3c PH |
986 | |
987 | else if (rc < 0) | |
988 | { | |
2fe76745 PP |
989 | if (ob->freeze_signal) |
990 | { | |
991 | addr->transport_return = DEFER; | |
992 | addr->special_action = SPECIAL_FREEZE; | |
993 | addr->message = string_sprintf("Child process of %s transport (running " | |
994 | "command \"%s\") was terminated by signal %d (%s)%s", tblock->name, cmd, | |
995 | -rc, os_strsignal(-rc), tmsg); | |
996 | } | |
997 | else if (!ob->ignore_status) | |
0756eb3c PH |
998 | { |
999 | addr->transport_return = FAIL; | |
1000 | addr->message = string_sprintf("Child process of %s transport (running " | |
22c3b60b PH |
1001 | "command \"%s\") was terminated by signal %d (%s)%s", tblock->name, cmd, |
1002 | -rc, os_strsignal(-rc), tmsg); | |
0756eb3c PH |
1003 | } |
1004 | } | |
1005 | ||
1006 | /* For positive values (process terminated with non-zero status), we need a | |
1007 | status code to request deferral. A number of systems contain the following | |
1008 | line in sysexits.h: | |
1009 | ||
1010 | #define EX_TEMPFAIL 75 | |
1011 | ||
1012 | with the description | |
1013 | ||
1014 | EX_TEMPFAIL -- temporary failure, indicating something that | |
1015 | is not really an error. In sendmail, this means | |
1016 | that a mailer (e.g.) could not create a connection, | |
1017 | and the request should be reattempted later. | |
1018 | ||
1019 | Based on this, we use exit code EX_TEMPFAIL as a default to mean "defer" when | |
1020 | not ignoring the returned status. However, there is now an option that | |
1021 | contains a list of temporary codes, with TEMPFAIL and CANTCREAT as defaults. | |
1022 | ||
1023 | Another case that needs special treatment is if execve() failed (typically | |
1024 | the command that was given is a non-existent path). By default this is | |
1025 | treated as just another failure, but if freeze_exec_fail is set, the reaction | |
1026 | is to freeze the message rather than bounce the address. Exim used to signal | |
1027 | this failure with EX_UNAVAILABLE, which is definined in many systems as | |
1028 | ||
1029 | #define EX_UNAVAILABLE 69 | |
1030 | ||
1031 | with the description | |
1032 | ||
1033 | EX_UNAVAILABLE -- A service is unavailable. This can occur | |
1034 | if a support program or file does not exist. This | |
1035 | can also be used as a catchall message when something | |
1036 | you wanted to do doesn't work, but you don't know why. | |
1037 | ||
1038 | However, this can be confused with a command that actually returns 69 because | |
1039 | something *it* wanted is unavailable. At release 4.21, Exim was changed to | |
1040 | use return code 127 instead, because this is what the shell returns when it | |
1041 | is unable to exec a command. We define it as EX_EXECFAILED, and use it in | |
1042 | child.c to signal execve() failure and other unexpected failures such as | |
1043 | setuid() not working - though that won't be the case here because we aren't | |
1044 | changing uid. */ | |
1045 | ||
1046 | else | |
1047 | { | |
1048 | /* Always handle execve() failure specially if requested to */ | |
1049 | ||
1050 | if (ob->freeze_exec_fail && (rc == EX_EXECFAILED)) | |
1051 | { | |
1052 | addr->transport_return = DEFER; | |
1053 | addr->special_action = SPECIAL_FREEZE; | |
22c3b60b PH |
1054 | addr->message = string_sprintf("pipe process failed to exec \"%s\"%s", |
1055 | cmd, tmsg); | |
0756eb3c PH |
1056 | } |
1057 | ||
1058 | /* Otherwise take action only if not ignoring status */ | |
1059 | ||
1060 | else if (!ob->ignore_status) | |
1061 | { | |
1062 | uschar *ss; | |
1063 | int size, ptr, i; | |
1064 | ||
1065 | /* If temp_errors is "*" all codes are temporary. Initializion checks | |
1066 | that it's either "*" or a list of numbers. If not "*", scan the list of | |
1067 | temporary failure codes; if any match, the result is DEFER. */ | |
1068 | ||
1069 | if (ob->temp_errors[0] == '*') | |
1070 | addr->transport_return = DEFER; | |
1071 | ||
1072 | else | |
1073 | { | |
55414b25 | 1074 | const uschar *s = ob->temp_errors; |
0756eb3c PH |
1075 | uschar *p; |
1076 | uschar buffer[64]; | |
1077 | int sep = 0; | |
1078 | ||
1079 | addr->transport_return = FAIL; | |
55414b25 | 1080 | while ((p = string_nextinlist(&s,&sep,buffer,sizeof(buffer)))) |
0756eb3c | 1081 | if (rc == Uatoi(p)) { addr->transport_return = DEFER; break; } |
0756eb3c PH |
1082 | } |
1083 | ||
1084 | /* Ensure the message contains the expanded command and arguments. This | |
1085 | doesn't have to be brilliantly efficient - it is an error situation. */ | |
1086 | ||
1087 | addr->message = string_sprintf("Child process of %s transport returned " | |
1088 | "%d", tblock->name, rc); | |
1089 | ||
1090 | ptr = Ustrlen(addr->message); | |
1091 | size = ptr + 1; | |
1092 | ||
1093 | /* If the return code is > 128, it often means that a shell command | |
1094 | was terminated by a signal. */ | |
1095 | ||
1096 | ss = (rc > 128)? | |
1097 | string_sprintf("(could mean shell command ended by signal %d (%s))", | |
1098 | rc-128, os_strsignal(rc-128)) : | |
1099 | US os_strexit(rc); | |
1100 | ||
1101 | if (*ss != 0) | |
1102 | { | |
1103 | addr->message = string_cat(addr->message, &size, &ptr, US" ", 1); | |
1104 | addr->message = string_cat(addr->message, &size, &ptr, | |
1105 | ss, Ustrlen(ss)); | |
1106 | } | |
1107 | ||
1108 | /* Now add the command and arguments */ | |
1109 | ||
1110 | addr->message = string_cat(addr->message, &size, &ptr, | |
1111 | US" from command:", 14); | |
1112 | ||
1113 | for (i = 0; i < sizeof(argv)/sizeof(int *) && argv[i] != NULL; i++) | |
1114 | { | |
1115 | BOOL quote = FALSE; | |
1116 | addr->message = string_cat(addr->message, &size, &ptr, US" ", 1); | |
1117 | if (Ustrpbrk(argv[i], " \t") != NULL) | |
1118 | { | |
1119 | quote = TRUE; | |
1120 | addr->message = string_cat(addr->message, &size, &ptr, US"\"", 1); | |
1121 | } | |
1122 | addr->message = string_cat(addr->message, &size, &ptr, argv[i], | |
1123 | Ustrlen(argv[i])); | |
1124 | if (quote) | |
1125 | addr->message = string_cat(addr->message, &size, &ptr, US"\"", 1); | |
1126 | } | |
22c3b60b PH |
1127 | |
1128 | /* Add previous filter timeout message, if present. */ | |
1129 | ||
1130 | if (*tmsg != 0) | |
1131 | addr->message = string_cat(addr->message, &size, &ptr, tmsg, | |
1132 | Ustrlen(tmsg)); | |
1133 | ||
0756eb3c PH |
1134 | addr->message[ptr] = 0; /* Ensure concatenated string terminated */ |
1135 | } | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | /* Ensure all subprocesses (in particular, the output handling process) | |
1140 | are complete before we pass this point. */ | |
1141 | ||
1142 | while (wait(&rc) >= 0); | |
1143 | ||
1144 | DEBUG(D_transport) debug_printf("%s transport yielded %d\n", tblock->name, | |
1145 | addr->transport_return); | |
1146 | ||
1147 | /* If there has been a problem, the message in addr->message contains details | |
1148 | of the pipe command. We don't want to expose these to the world, so we set up | |
1149 | something bland to return to the sender. */ | |
1150 | ||
1151 | if (addr->transport_return != OK) | |
1152 | addr->user_message = US"local delivery failed"; | |
1153 | ||
1154 | return FALSE; | |
1155 | } | |
1156 | ||
1157 | /* End of transport/pipe.c */ |