90ecd0629631b9dcfdb7186117a17d935b45ff48
[exim.git] / src / src / exim.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2009 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
11
12
13 #include "exim.h"
14
15 extern void init_lookup_list(void);
16
17
18
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
22
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
30
31 static void *
32 function_store_get(size_t size)
33 {
34 return store_get((int)size);
35 }
36
37 static void
38 function_dummy_free(void *block) { block = block; }
39
40 static void *
41 function_store_malloc(size_t size)
42 {
43 return store_malloc((int)size);
44 }
45
46 static void
47 function_store_free(void *block)
48 {
49 store_free(block);
50 }
51
52
53
54
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
58
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
64
65 Argument:
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
69
70 Returns: pointer to the compiled pattern
71 */
72
73 const pcre *
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
75 {
76 int offset;
77 int options = PCRE_COPT;
78 const pcre *yield;
79 const uschar *error;
80 if (use_malloc)
81 {
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
84 }
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
89 if (yield == NULL)
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
92 return yield;
93 }
94
95
96
97
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
101
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
104
105 Arguments:
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
112
113 Returns: TRUE or FALSE
114 */
115
116 BOOL
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
118 {
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
122 BOOL yield = n >= 0;
123 if (n == 0) n = EXPAND_MAXN + 1;
124 if (yield)
125 {
126 int nn;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
129 {
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
132 }
133 expand_nmax--;
134 }
135 return yield;
136 }
137
138
139
140
141 /*************************************************
142 * Set up processing details *
143 *************************************************/
144
145 /* Save a text string for dumping when SIGUSR1 is received.
146 Do checks for overruns.
147
148 Arguments: format and arguments, as for printf()
149 Returns: nothing
150 */
151
152 void
153 set_process_info(const char *format, ...)
154 {
155 int len;
156 va_list ap;
157 sprintf(CS process_info, "%5d ", (int)getpid());
158 len = Ustrlen(process_info);
159 va_start(ap, format);
160 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
161 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
162 len = Ustrlen(process_info);
163 process_info[len+0] = '\n';
164 process_info[len+1] = '\0';
165 process_info_len = len + 1;
166 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
167 va_end(ap);
168 }
169
170
171
172
173 /*************************************************
174 * Handler for SIGUSR1 *
175 *************************************************/
176
177 /* SIGUSR1 causes any exim process to write to the process log details of
178 what it is currently doing. It will only be used if the OS is capable of
179 setting up a handler that causes automatic restarting of any system call
180 that is in progress at the time.
181
182 This function takes care to be signal-safe.
183
184 Argument: the signal number (SIGUSR1)
185 Returns: nothing
186 */
187
188 static void
189 usr1_handler(int sig)
190 {
191 int fd;
192
193 os_restarting_signal(sig, usr1_handler);
194
195 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
196 if (fd < 0)
197 {
198 /* If we are already running as the Exim user, try to create it in the
199 current process (assuming spool_directory exists). Otherwise, if we are
200 root, do the creation in an exim:exim subprocess. */
201
202 int euid = geteuid();
203 if (euid == exim_uid)
204 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
205 else if (euid == root_uid)
206 fd = log_create_as_exim(process_log_path);
207 }
208
209 /* If we are neither exim nor root, or if we failed to create the log file,
210 give up. There is not much useful we can do with errors, since we don't want
211 to disrupt whatever is going on outside the signal handler. */
212
213 if (fd < 0) return;
214
215 (void)write(fd, process_info, process_info_len);
216 (void)close(fd);
217 }
218
219
220
221 /*************************************************
222 * Timeout handler *
223 *************************************************/
224
225 /* This handler is enabled most of the time that Exim is running. The handler
226 doesn't actually get used unless alarm() has been called to set a timer, to
227 place a time limit on a system call of some kind. When the handler is run, it
228 re-enables itself.
229
230 There are some other SIGALRM handlers that are used in special cases when more
231 than just a flag setting is required; for example, when reading a message's
232 input. These are normally set up in the code module that uses them, and the
233 SIGALRM handler is reset to this one afterwards.
234
235 Argument: the signal value (SIGALRM)
236 Returns: nothing
237 */
238
239 void
240 sigalrm_handler(int sig)
241 {
242 sig = sig; /* Keep picky compilers happy */
243 sigalrm_seen = TRUE;
244 os_non_restarting_signal(SIGALRM, sigalrm_handler);
245 }
246
247
248
249 /*************************************************
250 * Sleep for a fractional time interval *
251 *************************************************/
252
253 /* This function is called by millisleep() and exim_wait_tick() to wait for a
254 period of time that may include a fraction of a second. The coding is somewhat
255 tedious. We do not expect setitimer() ever to fail, but if it does, the process
256 will wait for ever, so we panic in this instance. (There was a case of this
257 when a bug in a function that calls milliwait() caused it to pass invalid data.
258 That's when I added the check. :-)
259
260 Argument: an itimerval structure containing the interval
261 Returns: nothing
262 */
263
264 static void
265 milliwait(struct itimerval *itval)
266 {
267 sigset_t sigmask;
268 sigset_t old_sigmask;
269 (void)sigemptyset(&sigmask); /* Empty mask */
270 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
271 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
272 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
273 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
274 "setitimer() failed: %s", strerror(errno));
275 (void)sigfillset(&sigmask); /* All signals */
276 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
277 (void)sigsuspend(&sigmask); /* Until SIGALRM */
278 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
279 }
280
281
282
283
284 /*************************************************
285 * Millisecond sleep function *
286 *************************************************/
287
288 /* The basic sleep() function has a granularity of 1 second, which is too rough
289 in some cases - for example, when using an increasing delay to slow down
290 spammers.
291
292 Argument: number of millseconds
293 Returns: nothing
294 */
295
296 void
297 millisleep(int msec)
298 {
299 struct itimerval itval;
300 itval.it_interval.tv_sec = 0;
301 itval.it_interval.tv_usec = 0;
302 itval.it_value.tv_sec = msec/1000;
303 itval.it_value.tv_usec = (msec % 1000) * 1000;
304 milliwait(&itval);
305 }
306
307
308
309 /*************************************************
310 * Compare microsecond times *
311 *************************************************/
312
313 /*
314 Arguments:
315 tv1 the first time
316 tv2 the second time
317
318 Returns: -1, 0, or +1
319 */
320
321 int
322 exim_tvcmp(struct timeval *t1, struct timeval *t2)
323 {
324 if (t1->tv_sec > t2->tv_sec) return +1;
325 if (t1->tv_sec < t2->tv_sec) return -1;
326 if (t1->tv_usec > t2->tv_usec) return +1;
327 if (t1->tv_usec < t2->tv_usec) return -1;
328 return 0;
329 }
330
331
332
333
334 /*************************************************
335 * Clock tick wait function *
336 *************************************************/
337
338 /* Exim uses a time + a pid to generate a unique identifier in two places: its
339 message IDs, and in file names for maildir deliveries. Because some OS now
340 re-use pids within the same second, sub-second times are now being used.
341 However, for absolute certaintly, we must ensure the clock has ticked before
342 allowing the relevant process to complete. At the time of implementation of
343 this code (February 2003), the speed of processors is such that the clock will
344 invariably have ticked already by the time a process has done its job. This
345 function prepares for the time when things are faster - and it also copes with
346 clocks that go backwards.
347
348 Arguments:
349 then_tv A timeval which was used to create uniqueness; its usec field
350 has been rounded down to the value of the resolution.
351 We want to be sure the current time is greater than this.
352 resolution The resolution that was used to divide the microseconds
353 (1 for maildir, larger for message ids)
354
355 Returns: nothing
356 */
357
358 void
359 exim_wait_tick(struct timeval *then_tv, int resolution)
360 {
361 struct timeval now_tv;
362 long int now_true_usec;
363
364 (void)gettimeofday(&now_tv, NULL);
365 now_true_usec = now_tv.tv_usec;
366 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
367
368 if (exim_tvcmp(&now_tv, then_tv) <= 0)
369 {
370 struct itimerval itval;
371 itval.it_interval.tv_sec = 0;
372 itval.it_interval.tv_usec = 0;
373 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
374 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
375
376 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
377 negative value for the microseconds is possible only in the case when "now"
378 is more than a second less than "then". That means that itval.it_value.tv_sec
379 is greater than zero. The following correction is therefore safe. */
380
381 if (itval.it_value.tv_usec < 0)
382 {
383 itval.it_value.tv_usec += 1000000;
384 itval.it_value.tv_sec -= 1;
385 }
386
387 DEBUG(D_transport|D_receive)
388 {
389 if (!running_in_test_harness)
390 {
391 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
392 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
393 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
394 itval.it_value.tv_usec);
395 }
396 }
397
398 milliwait(&itval);
399 }
400 }
401
402
403
404
405 /*************************************************
406 * Call fopen() with umask 777 and adjust mode *
407 *************************************************/
408
409 /* Exim runs with umask(0) so that files created with open() have the mode that
410 is specified in the open() call. However, there are some files, typically in
411 the spool directory, that are created with fopen(). They end up world-writeable
412 if no precautions are taken. Although the spool directory is not accessible to
413 the world, this is an untidiness. So this is a wrapper function for fopen()
414 that sorts out the mode of the created file.
415
416 Arguments:
417 filename the file name
418 options the fopen() options
419 mode the required mode
420
421 Returns: the fopened FILE or NULL
422 */
423
424 FILE *
425 modefopen(const uschar *filename, const char *options, mode_t mode)
426 {
427 mode_t saved_umask = umask(0777);
428 FILE *f = Ufopen(filename, options);
429 (void)umask(saved_umask);
430 if (f != NULL) (void)fchmod(fileno(f), mode);
431 return f;
432 }
433
434
435
436
437 /*************************************************
438 * Ensure stdin, stdout, and stderr exist *
439 *************************************************/
440
441 /* Some operating systems grumble if an exec() happens without a standard
442 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
443 file will be opened and will use these fd values, and then some other bit of
444 code will assume, for example, that it can write error messages to stderr.
445 This function ensures that fds 0, 1, and 2 are open if they do not already
446 exist, by connecting them to /dev/null.
447
448 This function is also used to ensure that std{in,out,err} exist at all times,
449 so that if any library that Exim calls tries to use them, it doesn't crash.
450
451 Arguments: None
452 Returns: Nothing
453 */
454
455 void
456 exim_nullstd(void)
457 {
458 int i;
459 int devnull = -1;
460 struct stat statbuf;
461 for (i = 0; i <= 2; i++)
462 {
463 if (fstat(i, &statbuf) < 0 && errno == EBADF)
464 {
465 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
466 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
467 string_open_failed(errno, "/dev/null"));
468 if (devnull != i) (void)dup2(devnull, i);
469 }
470 }
471 if (devnull > 2) (void)close(devnull);
472 }
473
474
475
476
477 /*************************************************
478 * Close unwanted file descriptors for delivery *
479 *************************************************/
480
481 /* This function is called from a new process that has been forked to deliver
482 an incoming message, either directly, or using exec.
483
484 We want any smtp input streams to be closed in this new process. However, it
485 has been observed that using fclose() here causes trouble. When reading in -bS
486 input, duplicate copies of messages have been seen. The files will be sharing a
487 file pointer with the parent process, and it seems that fclose() (at least on
488 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
489 least sometimes. Hence we go for closing the underlying file descriptors.
490
491 If TLS is active, we want to shut down the TLS library, but without molesting
492 the parent's SSL connection.
493
494 For delivery of a non-SMTP message, we want to close stdin and stdout (and
495 stderr unless debugging) because the calling process might have set them up as
496 pipes and be waiting for them to close before it waits for the submission
497 process to terminate. If they aren't closed, they hold up the calling process
498 until the initial delivery process finishes, which is not what we want.
499
500 Exception: We do want it for synchronous delivery!
501
502 And notwithstanding all the above, if D_resolver is set, implying resolver
503 debugging, leave stdout open, because that's where the resolver writes its
504 debugging output.
505
506 When we close stderr (which implies we've also closed stdout), we also get rid
507 of any controlling terminal.
508
509 Arguments: None
510 Returns: Nothing
511 */
512
513 static void
514 close_unwanted(void)
515 {
516 if (smtp_input)
517 {
518 #ifdef SUPPORT_TLS
519 tls_close(FALSE); /* Shut down the TLS library */
520 #endif
521 (void)close(fileno(smtp_in));
522 (void)close(fileno(smtp_out));
523 smtp_in = NULL;
524 }
525 else
526 {
527 (void)close(0); /* stdin */
528 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
529 if (debug_selector == 0) /* stderr */
530 {
531 if (!synchronous_delivery)
532 {
533 (void)close(2);
534 log_stderr = NULL;
535 }
536 (void)setsid();
537 }
538 }
539 }
540
541
542
543
544 /*************************************************
545 * Set uid and gid *
546 *************************************************/
547
548 /* This function sets a new uid and gid permanently, optionally calling
549 initgroups() to set auxiliary groups. There are some special cases when running
550 Exim in unprivileged modes. In these situations the effective uid will not be
551 root; if we already have the right effective uid/gid, and don't need to
552 initialize any groups, leave things as they are.
553
554 Arguments:
555 uid the uid
556 gid the gid
557 igflag TRUE if initgroups() wanted
558 msg text to use in debugging output and failure log
559
560 Returns: nothing; bombs out on failure
561 */
562
563 void
564 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
565 {
566 uid_t euid = geteuid();
567 gid_t egid = getegid();
568
569 if (euid == root_uid || euid != uid || egid != gid || igflag)
570 {
571 /* At least one OS returns +1 for initgroups failure, so just check for
572 non-zero. */
573
574 if (igflag)
575 {
576 struct passwd *pw = getpwuid(uid);
577 if (pw != NULL)
578 {
579 if (initgroups(pw->pw_name, gid) != 0)
580 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
581 (long int)uid, strerror(errno));
582 }
583 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
584 "no passwd entry for uid=%ld", (long int)uid);
585 }
586
587 if (setgid(gid) < 0 || setuid(uid) < 0)
588 {
589 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
590 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
591 }
592 }
593
594 /* Debugging output included uid/gid and all groups */
595
596 DEBUG(D_uid)
597 {
598 int group_count, save_errno;
599 gid_t group_list[NGROUPS_MAX];
600 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
601 (long int)geteuid(), (long int)getegid(), (long int)getpid());
602 group_count = getgroups(NGROUPS_MAX, group_list);
603 save_errno = errno;
604 debug_printf(" auxiliary group list:");
605 if (group_count > 0)
606 {
607 int i;
608 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
609 }
610 else if (group_count < 0)
611 debug_printf(" <error: %s>", strerror(save_errno));
612 else debug_printf(" <none>");
613 debug_printf("\n");
614 }
615 }
616
617
618
619
620 /*************************************************
621 * Exit point *
622 *************************************************/
623
624 /* Exim exits via this function so that it always clears up any open
625 databases.
626
627 Arguments:
628 rc return code
629
630 Returns: does not return
631 */
632
633 void
634 exim_exit(int rc)
635 {
636 search_tidyup();
637 DEBUG(D_any)
638 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
639 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
640 exit(rc);
641 }
642
643
644
645
646 /*************************************************
647 * Extract port from host address *
648 *************************************************/
649
650 /* Called to extract the port from the values given to -oMa and -oMi.
651 It also checks the syntax of the address, and terminates it before the
652 port data when a port is extracted.
653
654 Argument:
655 address the address, with possible port on the end
656
657 Returns: the port, or zero if there isn't one
658 bombs out on a syntax error
659 */
660
661 static int
662 check_port(uschar *address)
663 {
664 int port = host_address_extract_port(address);
665 if (string_is_ip_address(address, NULL) == 0)
666 {
667 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
668 exit(EXIT_FAILURE);
669 }
670 return port;
671 }
672
673
674
675 /*************************************************
676 * Test/verify an address *
677 *************************************************/
678
679 /* This function is called by the -bv and -bt code. It extracts a working
680 address from a full RFC 822 address. This isn't really necessary per se, but it
681 has the effect of collapsing source routes.
682
683 Arguments:
684 s the address string
685 flags flag bits for verify_address()
686 exit_value to be set for failures
687
688 Returns: nothing
689 */
690
691 static void
692 test_address(uschar *s, int flags, int *exit_value)
693 {
694 int start, end, domain;
695 uschar *parse_error = NULL;
696 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
697 FALSE);
698 if (address == NULL)
699 {
700 fprintf(stdout, "syntax error: %s\n", parse_error);
701 *exit_value = 2;
702 }
703 else
704 {
705 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
706 -1, -1, NULL, NULL, NULL);
707 if (rc == FAIL) *exit_value = 2;
708 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
709 }
710 }
711
712
713
714 /*************************************************
715 * Show supported features *
716 *************************************************/
717
718 /* This function is called for -bV/--version and for -d to output the optional
719 features of the current Exim binary.
720
721 Arguments: a FILE for printing
722 Returns: nothing
723 */
724
725 static void
726 show_whats_supported(FILE *f)
727 {
728 auth_info *authi;
729
730 #ifdef DB_VERSION_STRING
731 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
732 #elif defined(BTREEVERSION) && defined(HASHVERSION)
733 #ifdef USE_DB
734 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
735 #else
736 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
737 #endif
738 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
739 fprintf(f, "Probably ndbm\n");
740 #elif defined(USE_TDB)
741 fprintf(f, "Using tdb\n");
742 #else
743 #ifdef USE_GDBM
744 fprintf(f, "Probably GDBM (native mode)\n");
745 #else
746 fprintf(f, "Probably GDBM (compatibility mode)\n");
747 #endif
748 #endif
749
750 fprintf(f, "Support for:");
751 #ifdef SUPPORT_CRYPTEQ
752 fprintf(f, " crypteq");
753 #endif
754 #if HAVE_ICONV
755 fprintf(f, " iconv()");
756 #endif
757 #if HAVE_IPV6
758 fprintf(f, " IPv6");
759 #endif
760 #ifdef HAVE_SETCLASSRESOURCES
761 fprintf(f, " use_setclassresources");
762 #endif
763 #ifdef SUPPORT_PAM
764 fprintf(f, " PAM");
765 #endif
766 #ifdef EXIM_PERL
767 fprintf(f, " Perl");
768 #endif
769 #ifdef EXPAND_DLFUNC
770 fprintf(f, " Expand_dlfunc");
771 #endif
772 #ifdef USE_TCP_WRAPPERS
773 fprintf(f, " TCPwrappers");
774 #endif
775 #ifdef SUPPORT_TLS
776 #ifdef USE_GNUTLS
777 fprintf(f, " GnuTLS");
778 #else
779 fprintf(f, " OpenSSL");
780 #endif
781 #endif
782 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
783 fprintf(f, " translate_ip_address");
784 #endif
785 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
786 fprintf(f, " move_frozen_messages");
787 #endif
788 #ifdef WITH_CONTENT_SCAN
789 fprintf(f, " Content_Scanning");
790 #endif
791 #ifndef DISABLE_DKIM
792 fprintf(f, " DKIM");
793 #endif
794 #ifdef WITH_OLD_DEMIME
795 fprintf(f, " Old_Demime");
796 #endif
797 #ifdef EXPERIMENTAL_SPF
798 fprintf(f, " Experimental_SPF");
799 #endif
800 #ifdef EXPERIMENTAL_SRS
801 fprintf(f, " Experimental_SRS");
802 #endif
803 #ifdef EXPERIMENTAL_BRIGHTMAIL
804 fprintf(f, " Experimental_Brightmail");
805 #endif
806 #ifdef EXPERIMENTAL_DCC
807 fprintf(f, " Experimental_DCC");
808 #endif
809 fprintf(f, "\n");
810
811 fprintf(f, "Lookups (built-in):");
812 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
813 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
814 #endif
815 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
816 fprintf(f, " cdb");
817 #endif
818 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
819 fprintf(f, " dbm dbmjz dbmnz");
820 #endif
821 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
822 fprintf(f, " dnsdb");
823 #endif
824 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
825 fprintf(f, " dsearch");
826 #endif
827 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
828 fprintf(f, " ibase");
829 #endif
830 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
831 fprintf(f, " ldap ldapdn ldapm");
832 #endif
833 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
834 fprintf(f, " mysql");
835 #endif
836 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
837 fprintf(f, " nis nis0");
838 #endif
839 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
840 fprintf(f, " nisplus");
841 #endif
842 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
843 fprintf(f, " oracle");
844 #endif
845 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
846 fprintf(f, " passwd");
847 #endif
848 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
849 fprintf(f, " pgsql");
850 #endif
851 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
852 fprintf(f, " sqlite");
853 #endif
854 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
855 fprintf(f, " testdb");
856 #endif
857 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
858 fprintf(f, " whoson");
859 #endif
860 fprintf(f, "\n");
861
862 fprintf(f, "Authenticators:");
863 #ifdef AUTH_CRAM_MD5
864 fprintf(f, " cram_md5");
865 #endif
866 #ifdef AUTH_CYRUS_SASL
867 fprintf(f, " cyrus_sasl");
868 #endif
869 #ifdef AUTH_DOVECOT
870 fprintf(f, " dovecot");
871 #endif
872 #ifdef AUTH_GSASL
873 fprintf(f, " gsasl");
874 #endif
875 #ifdef AUTH_HEIMDAL_GSSAPI
876 fprintf(f, " heimdal_gssapi");
877 #endif
878 #ifdef AUTH_PLAINTEXT
879 fprintf(f, " plaintext");
880 #endif
881 #ifdef AUTH_SPA
882 fprintf(f, " spa");
883 #endif
884 fprintf(f, "\n");
885
886 fprintf(f, "Routers:");
887 #ifdef ROUTER_ACCEPT
888 fprintf(f, " accept");
889 #endif
890 #ifdef ROUTER_DNSLOOKUP
891 fprintf(f, " dnslookup");
892 #endif
893 #ifdef ROUTER_IPLITERAL
894 fprintf(f, " ipliteral");
895 #endif
896 #ifdef ROUTER_IPLOOKUP
897 fprintf(f, " iplookup");
898 #endif
899 #ifdef ROUTER_MANUALROUTE
900 fprintf(f, " manualroute");
901 #endif
902 #ifdef ROUTER_QUERYPROGRAM
903 fprintf(f, " queryprogram");
904 #endif
905 #ifdef ROUTER_REDIRECT
906 fprintf(f, " redirect");
907 #endif
908 fprintf(f, "\n");
909
910 fprintf(f, "Transports:");
911 #ifdef TRANSPORT_APPENDFILE
912 fprintf(f, " appendfile");
913 #ifdef SUPPORT_MAILDIR
914 fprintf(f, "/maildir");
915 #endif
916 #ifdef SUPPORT_MAILSTORE
917 fprintf(f, "/mailstore");
918 #endif
919 #ifdef SUPPORT_MBX
920 fprintf(f, "/mbx");
921 #endif
922 #endif
923 #ifdef TRANSPORT_AUTOREPLY
924 fprintf(f, " autoreply");
925 #endif
926 #ifdef TRANSPORT_LMTP
927 fprintf(f, " lmtp");
928 #endif
929 #ifdef TRANSPORT_PIPE
930 fprintf(f, " pipe");
931 #endif
932 #ifdef TRANSPORT_SMTP
933 fprintf(f, " smtp");
934 #endif
935 fprintf(f, "\n");
936
937 if (fixed_never_users[0] > 0)
938 {
939 int i;
940 fprintf(f, "Fixed never_users: ");
941 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
942 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
943 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
944 }
945
946 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
947
948 /* Everything else is details which are only worth reporting when debugging.
949 Perhaps the tls_version_report should move into this too. */
950 DEBUG(D_any) do {
951
952 int i;
953
954 /* clang defines __GNUC__ (at least, for me) so test for it first */
955 #if defined(__clang__)
956 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
957 #elif defined(__GNUC__)
958 fprintf(f, "Compiler: GCC [%s]\n",
959 # ifdef __VERSION__
960 __VERSION__
961 # else
962 "? unknown version ?"
963 # endif
964 );
965 #else
966 fprintf(f, "Compiler: <unknown>\n");
967 #endif
968
969 #ifdef SUPPORT_TLS
970 tls_version_report(f);
971 #endif
972
973 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
974 if (authi->version_report) {
975 (*authi->version_report)(f);
976 }
977 }
978
979 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
980 " Runtime: %s\n",
981 PCRE_MAJOR, PCRE_MINOR,
982 /* PRE_PRERELEASE is either defined and empty or a string.
983 * unless its an ancient version of PCRE in which case it
984 * is not defined */
985 #ifdef PCRE_PRERELEASE
986 # define STRINGIFY(x) #x
987 STRINGIFY(PCRE_PRERELEASE) "",
988 # undef STRINGIFY
989 #else
990 "",
991 #endif
992 pcre_version());
993
994 init_lookup_list();
995 for (i = 0; i < lookup_list_count; i++)
996 {
997 if (lookup_list[i]->version_report)
998 lookup_list[i]->version_report(f);
999 }
1000
1001 #ifdef WHITELIST_D_MACROS
1002 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1003 #else
1004 fprintf(f, "WHITELIST_D_MACROS unset\n");
1005 #endif
1006 #ifdef TRUSTED_CONFIG_LIST
1007 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1008 #else
1009 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1010 #endif
1011
1012 } while (0);
1013 }
1014
1015
1016
1017
1018 /*************************************************
1019 * Quote a local part *
1020 *************************************************/
1021
1022 /* This function is used when a sender address or a From: or Sender: header
1023 line is being created from the caller's login, or from an authenticated_id. It
1024 applies appropriate quoting rules for a local part.
1025
1026 Argument: the local part
1027 Returns: the local part, quoted if necessary
1028 */
1029
1030 uschar *
1031 local_part_quote(uschar *lpart)
1032 {
1033 BOOL needs_quote = FALSE;
1034 int size, ptr;
1035 uschar *yield;
1036 uschar *t;
1037
1038 for (t = lpart; !needs_quote && *t != 0; t++)
1039 {
1040 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1041 (*t != '.' || t == lpart || t[1] == 0);
1042 }
1043
1044 if (!needs_quote) return lpart;
1045
1046 size = ptr = 0;
1047 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1048
1049 for (;;)
1050 {
1051 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1052 if (nq == NULL)
1053 {
1054 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1055 break;
1056 }
1057 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1058 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1059 yield = string_cat(yield, &size, &ptr, nq, 1);
1060 lpart = nq + 1;
1061 }
1062
1063 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1064 yield[ptr] = 0;
1065 return yield;
1066 }
1067
1068
1069
1070 #ifdef USE_READLINE
1071 /*************************************************
1072 * Load readline() functions *
1073 *************************************************/
1074
1075 /* This function is called from testing executions that read data from stdin,
1076 but only when running as the calling user. Currently, only -be does this. The
1077 function loads the readline() function library and passes back the functions.
1078 On some systems, it needs the curses library, so load that too, but try without
1079 it if loading fails. All this functionality has to be requested at build time.
1080
1081 Arguments:
1082 fn_readline_ptr pointer to where to put the readline pointer
1083 fn_addhist_ptr pointer to where to put the addhistory function
1084
1085 Returns: the dlopen handle or NULL on failure
1086 */
1087
1088 static void *
1089 set_readline(char * (**fn_readline_ptr)(const char *),
1090 void (**fn_addhist_ptr)(const char *))
1091 {
1092 void *dlhandle;
1093 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1094
1095 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1096 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1097
1098 if (dlhandle != NULL)
1099 {
1100 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1101 * char * readline (const char *prompt);
1102 * void add_history (const char *string);
1103 */
1104 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1105 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1106 }
1107 else
1108 {
1109 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1110 }
1111
1112 return dlhandle;
1113 }
1114 #endif
1115
1116
1117
1118 /*************************************************
1119 * Get a line from stdin for testing things *
1120 *************************************************/
1121
1122 /* This function is called when running tests that can take a number of lines
1123 of input (for example, -be and -bt). It handles continuations and trailing
1124 spaces. And prompting and a blank line output on eof. If readline() is in use,
1125 the arguments are non-NULL and provide the relevant functions.
1126
1127 Arguments:
1128 fn_readline readline function or NULL
1129 fn_addhist addhist function or NULL
1130
1131 Returns: pointer to dynamic memory, or NULL at end of file
1132 */
1133
1134 static uschar *
1135 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1136 {
1137 int i;
1138 int size = 0;
1139 int ptr = 0;
1140 uschar *yield = NULL;
1141
1142 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1143
1144 for (i = 0;; i++)
1145 {
1146 uschar buffer[1024];
1147 uschar *p, *ss;
1148
1149 #ifdef USE_READLINE
1150 char *readline_line = NULL;
1151 if (fn_readline != NULL)
1152 {
1153 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1154 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1155 p = US readline_line;
1156 }
1157 else
1158 #endif
1159
1160 /* readline() not in use */
1161
1162 {
1163 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1164 p = buffer;
1165 }
1166
1167 /* Handle the line */
1168
1169 ss = p + (int)Ustrlen(p);
1170 while (ss > p && isspace(ss[-1])) ss--;
1171
1172 if (i > 0)
1173 {
1174 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1175 }
1176
1177 yield = string_cat(yield, &size, &ptr, p, ss - p);
1178
1179 #ifdef USE_READLINE
1180 if (fn_readline != NULL) free(readline_line);
1181 #endif
1182
1183 if (ss == p || yield[ptr-1] != '\\')
1184 {
1185 yield[ptr] = 0;
1186 break;
1187 }
1188 yield[--ptr] = 0;
1189 }
1190
1191 if (yield == NULL) printf("\n");
1192 return yield;
1193 }
1194
1195
1196
1197 /*************************************************
1198 * Output usage information for the program *
1199 *************************************************/
1200
1201 /* This function is called when there are no recipients
1202 or a specific --help argument was added.
1203
1204 Arguments:
1205 progname information on what name we were called by
1206
1207 Returns: DOES NOT RETURN
1208 */
1209
1210 static void
1211 exim_usage(uschar *progname)
1212 {
1213
1214 /* Handle specific program invocation varients */
1215 if (Ustrcmp(progname, US"-mailq") == 0)
1216 {
1217 fprintf(stderr,
1218 "mailq - list the contents of the mail queue\n\n"
1219 "For a list of options, see the Exim documentation.\n");
1220 exit(EXIT_FAILURE);
1221 }
1222
1223 /* Generic usage - we output this whatever happens */
1224 fprintf(stderr,
1225 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1226 "not directly from a shell command line. Options and/or arguments control\n"
1227 "what it does when called. For a list of options, see the Exim documentation.\n");
1228
1229 exit(EXIT_FAILURE);
1230 }
1231
1232
1233
1234 /*************************************************
1235 * Validate that the macros given are okay *
1236 *************************************************/
1237
1238 /* Typically, Exim will drop privileges if macros are supplied. In some
1239 cases, we want to not do so.
1240
1241 Arguments: none (macros is a global)
1242 Returns: true if trusted, false otherwise
1243 */
1244
1245 static BOOL
1246 macros_trusted(void)
1247 {
1248 #ifdef WHITELIST_D_MACROS
1249 macro_item *m;
1250 uschar *whitelisted, *end, *p, **whites, **w;
1251 int white_count, i, n;
1252 size_t len;
1253 BOOL prev_char_item, found;
1254 #endif
1255
1256 if (macros == NULL)
1257 return TRUE;
1258 #ifndef WHITELIST_D_MACROS
1259 return FALSE;
1260 #else
1261
1262 /* We only trust -D overrides for some invoking users:
1263 root, the exim run-time user, the optional config owner user.
1264 I don't know why config-owner would be needed, but since they can own the
1265 config files anyway, there's no security risk to letting them override -D. */
1266 if ( ! ((real_uid == root_uid)
1267 || (real_uid == exim_uid)
1268 #ifdef CONFIGURE_OWNER
1269 || (real_uid == config_uid)
1270 #endif
1271 ))
1272 {
1273 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1274 return FALSE;
1275 }
1276
1277 /* Get a list of macros which are whitelisted */
1278 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1279 prev_char_item = FALSE;
1280 white_count = 0;
1281 for (p = whitelisted; *p != '\0'; ++p)
1282 {
1283 if (*p == ':' || isspace(*p))
1284 {
1285 *p = '\0';
1286 if (prev_char_item)
1287 ++white_count;
1288 prev_char_item = FALSE;
1289 continue;
1290 }
1291 if (!prev_char_item)
1292 prev_char_item = TRUE;
1293 }
1294 end = p;
1295 if (prev_char_item)
1296 ++white_count;
1297 if (!white_count)
1298 return FALSE;
1299 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1300 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1301 {
1302 if (*p != '\0')
1303 {
1304 whites[i++] = p;
1305 if (i == white_count)
1306 break;
1307 while (*p != '\0' && p < end)
1308 ++p;
1309 }
1310 }
1311 whites[i] = NULL;
1312
1313 /* The list of macros should be very short. Accept the N*M complexity. */
1314 for (m = macros; m != NULL; m = m->next)
1315 {
1316 found = FALSE;
1317 for (w = whites; *w; ++w)
1318 if (Ustrcmp(*w, m->name) == 0)
1319 {
1320 found = TRUE;
1321 break;
1322 }
1323 if (!found)
1324 return FALSE;
1325 if (m->replacement == NULL)
1326 continue;
1327 len = Ustrlen(m->replacement);
1328 if (len == 0)
1329 continue;
1330 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1331 0, PCRE_EOPT, NULL, 0);
1332 if (n < 0)
1333 {
1334 if (n != PCRE_ERROR_NOMATCH)
1335 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1336 return FALSE;
1337 }
1338 }
1339 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1340 return TRUE;
1341 #endif
1342 }
1343
1344
1345 /*************************************************
1346 * Entry point and high-level code *
1347 *************************************************/
1348
1349 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1350 the appropriate action. All the necessary functions are present in the one
1351 binary. I originally thought one should split it up, but it turns out that so
1352 much of the apparatus is needed in each chunk that one might as well just have
1353 it all available all the time, which then makes the coding easier as well.
1354
1355 Arguments:
1356 argc count of entries in argv
1357 argv argument strings, with argv[0] being the program name
1358
1359 Returns: EXIT_SUCCESS if terminated successfully
1360 EXIT_FAILURE otherwise, except when a message has been sent
1361 to the sender, and -oee was given
1362 */
1363
1364 int
1365 main(int argc, char **cargv)
1366 {
1367 uschar **argv = USS cargv;
1368 int arg_receive_timeout = -1;
1369 int arg_smtp_receive_timeout = -1;
1370 int arg_error_handling = error_handling;
1371 int filter_sfd = -1;
1372 int filter_ufd = -1;
1373 int group_count;
1374 int i, rv;
1375 int list_queue_option = 0;
1376 int msg_action = 0;
1377 int msg_action_arg = -1;
1378 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1379 int queue_only_reason = 0;
1380 #ifdef EXIM_PERL
1381 int perl_start_option = 0;
1382 #endif
1383 int recipients_arg = argc;
1384 int sender_address_domain = 0;
1385 int test_retry_arg = -1;
1386 int test_rewrite_arg = -1;
1387 BOOL arg_queue_only = FALSE;
1388 BOOL bi_option = FALSE;
1389 BOOL checking = FALSE;
1390 BOOL count_queue = FALSE;
1391 BOOL expansion_test = FALSE;
1392 BOOL extract_recipients = FALSE;
1393 BOOL forced_delivery = FALSE;
1394 BOOL f_end_dot = FALSE;
1395 BOOL deliver_give_up = FALSE;
1396 BOOL list_queue = FALSE;
1397 BOOL list_options = FALSE;
1398 BOOL local_queue_only;
1399 BOOL more = TRUE;
1400 BOOL one_msg_action = FALSE;
1401 BOOL queue_only_set = FALSE;
1402 BOOL receiving_message = TRUE;
1403 BOOL sender_ident_set = FALSE;
1404 BOOL session_local_queue_only;
1405 BOOL unprivileged;
1406 BOOL removed_privilege = FALSE;
1407 BOOL usage_wanted = FALSE;
1408 BOOL verify_address_mode = FALSE;
1409 BOOL verify_as_sender = FALSE;
1410 BOOL version_printed = FALSE;
1411 uschar *alias_arg = NULL;
1412 uschar *called_as = US"";
1413 uschar *start_queue_run_id = NULL;
1414 uschar *stop_queue_run_id = NULL;
1415 uschar *expansion_test_message = NULL;
1416 uschar *ftest_domain = NULL;
1417 uschar *ftest_localpart = NULL;
1418 uschar *ftest_prefix = NULL;
1419 uschar *ftest_suffix = NULL;
1420 uschar *malware_test_file = NULL;
1421 uschar *real_sender_address;
1422 uschar *originator_home = US"/";
1423 void *reset_point;
1424
1425 struct passwd *pw;
1426 struct stat statbuf;
1427 pid_t passed_qr_pid = (pid_t)0;
1428 int passed_qr_pipe = -1;
1429 gid_t group_list[NGROUPS_MAX];
1430
1431 /* Possible options for -R and -S */
1432
1433 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1434
1435 /* Need to define this in case we need to change the environment in order
1436 to get rid of a bogus time zone. We have to make it char rather than uschar
1437 because some OS define it in /usr/include/unistd.h. */
1438
1439 extern char **environ;
1440
1441 /* If the Exim user and/or group and/or the configuration file owner/group were
1442 defined by ref:name at build time, we must now find the actual uid/gid values.
1443 This is a feature to make the lives of binary distributors easier. */
1444
1445 #ifdef EXIM_USERNAME
1446 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1447 {
1448 if (exim_uid == 0)
1449 {
1450 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1451 EXIM_USERNAME);
1452 exit(EXIT_FAILURE);
1453 }
1454 /* If ref:name uses a number as the name, route_finduser() returns
1455 TRUE with exim_uid set and pw coerced to NULL. */
1456 if (pw)
1457 exim_gid = pw->pw_gid;
1458 #ifndef EXIM_GROUPNAME
1459 else
1460 {
1461 fprintf(stderr,
1462 "exim: ref:name should specify a usercode, not a group.\n"
1463 "exim: can't let you get away with it unless you also specify a group.\n");
1464 exit(EXIT_FAILURE);
1465 }
1466 #endif
1467 }
1468 else
1469 {
1470 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1471 EXIM_USERNAME);
1472 exit(EXIT_FAILURE);
1473 }
1474 #endif
1475
1476 #ifdef EXIM_GROUPNAME
1477 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1478 {
1479 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1480 EXIM_GROUPNAME);
1481 exit(EXIT_FAILURE);
1482 }
1483 #endif
1484
1485 #ifdef CONFIGURE_OWNERNAME
1486 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1487 {
1488 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1489 CONFIGURE_OWNERNAME);
1490 exit(EXIT_FAILURE);
1491 }
1492 #endif
1493
1494 /* We default the system_filter_user to be the Exim run-time user, as a
1495 sane non-root value. */
1496 system_filter_uid = exim_uid;
1497
1498 #ifdef CONFIGURE_GROUPNAME
1499 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1500 {
1501 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1502 CONFIGURE_GROUPNAME);
1503 exit(EXIT_FAILURE);
1504 }
1505 #endif
1506
1507 /* In the Cygwin environment, some initialization needs doing. It is fudged
1508 in by means of this macro. */
1509
1510 #ifdef OS_INIT
1511 OS_INIT
1512 #endif
1513
1514 /* Check a field which is patched when we are running Exim within its
1515 testing harness; do a fast initial check, and then the whole thing. */
1516
1517 running_in_test_harness =
1518 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1519
1520 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1521 at the start of a program; however, it seems that some environments do not
1522 follow this. A "strange" locale can affect the formatting of timestamps, so we
1523 make quite sure. */
1524
1525 setlocale(LC_ALL, "C");
1526
1527 /* Set up the default handler for timing using alarm(). */
1528
1529 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1530
1531 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1532 because store_malloc writes a log entry on failure. */
1533
1534 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1535 if (log_buffer == NULL)
1536 {
1537 fprintf(stderr, "exim: failed to get store for log buffer\n");
1538 exit(EXIT_FAILURE);
1539 }
1540
1541 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1542 NULL when the daemon is run and the file is closed. We have to use this
1543 indirection, because some systems don't allow writing to the variable "stderr".
1544 */
1545
1546 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1547
1548 /* Arrange for the PCRE regex library to use our store functions. Note that
1549 the normal calls are actually macros that add additional arguments for
1550 debugging purposes so we have to assign specially constructed functions here.
1551 The default is to use store in the stacking pool, but this is overridden in the
1552 regex_must_compile() function. */
1553
1554 pcre_malloc = function_store_get;
1555 pcre_free = function_dummy_free;
1556
1557 /* Ensure there is a big buffer for temporary use in several places. It is put
1558 in malloc store so that it can be freed for enlargement if necessary. */
1559
1560 big_buffer = store_malloc(big_buffer_size);
1561
1562 /* Set up the handler for the data request signal, and set the initial
1563 descriptive text. */
1564
1565 set_process_info("initializing");
1566 os_restarting_signal(SIGUSR1, usr1_handler);
1567
1568 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1569 in the daemon code. For the rest of Exim's uses, we ignore it. */
1570
1571 signal(SIGHUP, SIG_IGN);
1572
1573 /* We don't want to die on pipe errors as the code is written to handle
1574 the write error instead. */
1575
1576 signal(SIGPIPE, SIG_IGN);
1577
1578 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1579 set to SIG_IGN. This causes subprocesses that complete before the parent
1580 process waits for them not to hang around, so when Exim calls wait(), nothing
1581 is there. The wait() code has been made robust against this, but let's ensure
1582 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1583 ending status. We use sigaction rather than plain signal() on those OS where
1584 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1585 problem on AIX with this.) */
1586
1587 #ifdef SA_NOCLDWAIT
1588 {
1589 struct sigaction act;
1590 act.sa_handler = SIG_DFL;
1591 sigemptyset(&(act.sa_mask));
1592 act.sa_flags = 0;
1593 sigaction(SIGCHLD, &act, NULL);
1594 }
1595 #else
1596 signal(SIGCHLD, SIG_DFL);
1597 #endif
1598
1599 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1600 SIGHUP. */
1601
1602 sighup_argv = argv;
1603
1604 /* Set up the version number. Set up the leading 'E' for the external form of
1605 message ids, set the pointer to the internal form, and initialize it to
1606 indicate no message being processed. */
1607
1608 version_init();
1609 message_id_option[0] = '-';
1610 message_id_external = message_id_option + 1;
1611 message_id_external[0] = 'E';
1612 message_id = message_id_external + 1;
1613 message_id[0] = 0;
1614
1615 /* Set the umask to zero so that any files Exim creates using open() are
1616 created with the modes that it specifies. NOTE: Files created with fopen() have
1617 a problem, which was not recognized till rather late (February 2006). With this
1618 umask, such files will be world writeable. (They are all content scanning files
1619 in the spool directory, which isn't world-accessible, so this is not a
1620 disaster, but it's untidy.) I don't want to change this overall setting,
1621 however, because it will interact badly with the open() calls. Instead, there's
1622 now a function called modefopen() that fiddles with the umask while calling
1623 fopen(). */
1624
1625 (void)umask(0);
1626
1627 /* Precompile the regular expression for matching a message id. Keep this in
1628 step with the code that generates ids in the accept.c module. We need to do
1629 this here, because the -M options check their arguments for syntactic validity
1630 using mac_ismsgid, which uses this. */
1631
1632 regex_ismsgid =
1633 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1634
1635 /* Precompile the regular expression that is used for matching an SMTP error
1636 code, possibly extended, at the start of an error message. Note that the
1637 terminating whitespace character is included. */
1638
1639 regex_smtp_code =
1640 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1641 FALSE, TRUE);
1642
1643 #ifdef WHITELIST_D_MACROS
1644 /* Precompile the regular expression used to filter the content of macros
1645 given to -D for permissibility. */
1646
1647 regex_whitelisted_macro =
1648 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1649 #endif
1650
1651
1652 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1653 this seems to be a generally accepted convention, since one finds symbolic
1654 links called "mailq" in standard OS configurations. */
1655
1656 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1657 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1658 {
1659 list_queue = TRUE;
1660 receiving_message = FALSE;
1661 called_as = US"-mailq";
1662 }
1663
1664 /* If the program is called as "rmail" treat it as equivalent to
1665 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1666 i.e. preventing a single dot on a line from terminating the message, and
1667 returning with zero return code, even in cases of error (provided an error
1668 message has been sent). */
1669
1670 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1671 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1672 {
1673 dot_ends = FALSE;
1674 called_as = US"-rmail";
1675 errors_sender_rc = EXIT_SUCCESS;
1676 }
1677
1678 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1679 this is a smail convention. */
1680
1681 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1682 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1683 {
1684 smtp_input = smtp_batched_input = TRUE;
1685 called_as = US"-rsmtp";
1686 }
1687
1688 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1689 this is a smail convention. */
1690
1691 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1692 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1693 {
1694 queue_interval = 0;
1695 receiving_message = FALSE;
1696 called_as = US"-runq";
1697 }
1698
1699 /* If the program is called as "newaliases" treat it as equivalent to
1700 "exim -bi"; this is a sendmail convention. */
1701
1702 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1703 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1704 {
1705 bi_option = TRUE;
1706 receiving_message = FALSE;
1707 called_as = US"-newaliases";
1708 }
1709
1710 /* Save the original effective uid for a couple of uses later. It should
1711 normally be root, but in some esoteric environments it may not be. */
1712
1713 original_euid = geteuid();
1714
1715 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1716 to be the same as the real ones. This makes a difference only if Exim is setuid
1717 (or setgid) to something other than root, which could be the case in some
1718 special configurations. */
1719
1720 real_uid = getuid();
1721 real_gid = getgid();
1722
1723 if (real_uid == root_uid)
1724 {
1725 rv = setgid(real_gid);
1726 if (rv)
1727 {
1728 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1729 (long int)real_gid, strerror(errno));
1730 exit(EXIT_FAILURE);
1731 }
1732 rv = setuid(real_uid);
1733 if (rv)
1734 {
1735 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1736 (long int)real_uid, strerror(errno));
1737 exit(EXIT_FAILURE);
1738 }
1739 }
1740
1741 /* If neither the original real uid nor the original euid was root, Exim is
1742 running in an unprivileged state. */
1743
1744 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1745
1746 /* Scan the program's arguments. Some can be dealt with right away; others are
1747 simply recorded for checking and handling afterwards. Do a high-level switch
1748 on the second character (the one after '-'), to save some effort. */
1749
1750 for (i = 1; i < argc; i++)
1751 {
1752 BOOL badarg = FALSE;
1753 uschar *arg = argv[i];
1754 uschar *argrest;
1755 int switchchar;
1756
1757 /* An argument not starting with '-' is the start of a recipients list;
1758 break out of the options-scanning loop. */
1759
1760 if (arg[0] != '-')
1761 {
1762 recipients_arg = i;
1763 break;
1764 }
1765
1766 /* An option consistion of -- terminates the options */
1767
1768 if (Ustrcmp(arg, "--") == 0)
1769 {
1770 recipients_arg = i + 1;
1771 break;
1772 }
1773
1774 /* Handle flagged options */
1775
1776 switchchar = arg[1];
1777 argrest = arg+2;
1778
1779 /* Make all -ex options synonymous with -oex arguments, since that
1780 is assumed by various callers. Also make -qR options synonymous with -R
1781 options, as that seems to be required as well. Allow for -qqR too, and
1782 the same for -S options. */
1783
1784 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1785 Ustrncmp(arg+1, "qR", 2) == 0 ||
1786 Ustrncmp(arg+1, "qS", 2) == 0)
1787 {
1788 switchchar = arg[2];
1789 argrest++;
1790 }
1791 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1792 {
1793 switchchar = arg[3];
1794 argrest += 2;
1795 queue_2stage = TRUE;
1796 }
1797
1798 /* Make -r synonymous with -f, since it is a documented alias */
1799
1800 else if (arg[1] == 'r') switchchar = 'f';
1801
1802 /* Make -ov synonymous with -v */
1803
1804 else if (Ustrcmp(arg, "-ov") == 0)
1805 {
1806 switchchar = 'v';
1807 argrest++;
1808 }
1809
1810 /* deal with --option_aliases */
1811 else if (switchchar == '-')
1812 {
1813 if (Ustrcmp(argrest, "help") == 0)
1814 {
1815 usage_wanted = TRUE;
1816 break;
1817 }
1818 else if (Ustrcmp(argrest, "version") == 0)
1819 {
1820 switchchar = 'b';
1821 argrest = US"V";
1822 }
1823 }
1824
1825 /* High-level switch on active initial letter */
1826
1827 switch(switchchar)
1828 {
1829 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1830 so has no need of it. */
1831
1832 case 'B':
1833 if (*argrest == 0) i++; /* Skip over the type */
1834 break;
1835
1836
1837 case 'b':
1838 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1839
1840 /* -bd: Run in daemon mode, awaiting SMTP connections.
1841 -bdf: Ditto, but in the foreground.
1842 */
1843
1844 if (*argrest == 'd')
1845 {
1846 daemon_listen = TRUE;
1847 if (*(++argrest) == 'f') background_daemon = FALSE;
1848 else if (*argrest != 0) { badarg = TRUE; break; }
1849 }
1850
1851 /* -be: Run in expansion test mode
1852 -bem: Ditto, but read a message from a file first
1853 */
1854
1855 else if (*argrest == 'e')
1856 {
1857 expansion_test = checking = TRUE;
1858 if (argrest[1] == 'm')
1859 {
1860 if (++i >= argc) { badarg = TRUE; break; }
1861 expansion_test_message = argv[i];
1862 argrest++;
1863 }
1864 if (argrest[1] != 0) { badarg = TRUE; break; }
1865 }
1866
1867 /* -bF: Run system filter test */
1868
1869 else if (*argrest == 'F')
1870 {
1871 filter_test |= FTEST_SYSTEM;
1872 if (*(++argrest) != 0) { badarg = TRUE; break; }
1873 if (++i < argc) filter_test_sfile = argv[i]; else
1874 {
1875 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1876 exit(EXIT_FAILURE);
1877 }
1878 }
1879
1880 /* -bf: Run user filter test
1881 -bfd: Set domain for filter testing
1882 -bfl: Set local part for filter testing
1883 -bfp: Set prefix for filter testing
1884 -bfs: Set suffix for filter testing
1885 */
1886
1887 else if (*argrest == 'f')
1888 {
1889 if (*(++argrest) == 0)
1890 {
1891 filter_test |= FTEST_USER;
1892 if (++i < argc) filter_test_ufile = argv[i]; else
1893 {
1894 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1895 exit(EXIT_FAILURE);
1896 }
1897 }
1898 else
1899 {
1900 if (++i >= argc)
1901 {
1902 fprintf(stderr, "exim: string expected after %s\n", arg);
1903 exit(EXIT_FAILURE);
1904 }
1905 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1906 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1907 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1908 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1909 else { badarg = TRUE; break; }
1910 }
1911 }
1912
1913 /* -bh: Host checking - an IP address must follow. */
1914
1915 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1916 {
1917 if (++i >= argc) { badarg = TRUE; break; }
1918 sender_host_address = argv[i];
1919 host_checking = checking = log_testing_mode = TRUE;
1920 host_checking_callout = argrest[1] == 'c';
1921 }
1922
1923 /* -bi: This option is used by sendmail to initialize *the* alias file,
1924 though it has the -oA option to specify a different file. Exim has no
1925 concept of *the* alias file, but since Sun's YP make script calls
1926 sendmail this way, some support must be provided. */
1927
1928 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1929
1930 /* -bm: Accept and deliver message - the default option. Reinstate
1931 receiving_message, which got turned off for all -b options. */
1932
1933 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1934
1935 /* -bmalware: test the filename given for malware */
1936
1937 else if (Ustrcmp(argrest, "malware") == 0)
1938 {
1939 if (++i >= argc) { badarg = TRUE; break; }
1940 malware_test_file = argv[i];
1941 }
1942
1943 /* -bnq: For locally originating messages, do not qualify unqualified
1944 addresses. In the envelope, this causes errors; in header lines they
1945 just get left. */
1946
1947 else if (Ustrcmp(argrest, "nq") == 0)
1948 {
1949 allow_unqualified_sender = FALSE;
1950 allow_unqualified_recipient = FALSE;
1951 }
1952
1953 /* -bpxx: List the contents of the mail queue, in various forms. If
1954 the option is -bpc, just a queue count is needed. Otherwise, if the
1955 first letter after p is r, then order is random. */
1956
1957 else if (*argrest == 'p')
1958 {
1959 if (*(++argrest) == 'c')
1960 {
1961 count_queue = TRUE;
1962 if (*(++argrest) != 0) badarg = TRUE;
1963 break;
1964 }
1965
1966 if (*argrest == 'r')
1967 {
1968 list_queue_option = 8;
1969 argrest++;
1970 }
1971 else list_queue_option = 0;
1972
1973 list_queue = TRUE;
1974
1975 /* -bp: List the contents of the mail queue, top-level only */
1976
1977 if (*argrest == 0) {}
1978
1979 /* -bpu: List the contents of the mail queue, top-level undelivered */
1980
1981 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1982
1983 /* -bpa: List the contents of the mail queue, including all delivered */
1984
1985 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1986
1987 /* Unknown after -bp[r] */
1988
1989 else
1990 {
1991 badarg = TRUE;
1992 break;
1993 }
1994 }
1995
1996
1997 /* -bP: List the configuration variables given as the address list.
1998 Force -v, so configuration errors get displayed. */
1999
2000 else if (Ustrcmp(argrest, "P") == 0)
2001 {
2002 list_options = TRUE;
2003 debug_selector |= D_v;
2004 debug_file = stderr;
2005 }
2006
2007 /* -brt: Test retry configuration lookup */
2008
2009 else if (Ustrcmp(argrest, "rt") == 0)
2010 {
2011 test_retry_arg = i + 1;
2012 goto END_ARG;
2013 }
2014
2015 /* -brw: Test rewrite configuration */
2016
2017 else if (Ustrcmp(argrest, "rw") == 0)
2018 {
2019 test_rewrite_arg = i + 1;
2020 goto END_ARG;
2021 }
2022
2023 /* -bS: Read SMTP commands on standard input, but produce no replies -
2024 all errors are reported by sending messages. */
2025
2026 else if (Ustrcmp(argrest, "S") == 0)
2027 smtp_input = smtp_batched_input = receiving_message = TRUE;
2028
2029 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2030 on standard output. */
2031
2032 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2033
2034 /* -bt: address testing mode */
2035
2036 else if (Ustrcmp(argrest, "t") == 0)
2037 address_test_mode = checking = log_testing_mode = TRUE;
2038
2039 /* -bv: verify addresses */
2040
2041 else if (Ustrcmp(argrest, "v") == 0)
2042 verify_address_mode = checking = log_testing_mode = TRUE;
2043
2044 /* -bvs: verify sender addresses */
2045
2046 else if (Ustrcmp(argrest, "vs") == 0)
2047 {
2048 verify_address_mode = checking = log_testing_mode = TRUE;
2049 verify_as_sender = TRUE;
2050 }
2051
2052 /* -bV: Print version string and support details */
2053
2054 else if (Ustrcmp(argrest, "V") == 0)
2055 {
2056 printf("Exim version %s #%s built %s\n", version_string,
2057 version_cnumber, version_date);
2058 printf("%s\n", CS version_copyright);
2059 version_printed = TRUE;
2060 show_whats_supported(stdout);
2061 }
2062
2063 else badarg = TRUE;
2064 break;
2065
2066
2067 /* -C: change configuration file list; ignore if it isn't really
2068 a change! Enforce a prefix check if required. */
2069
2070 case 'C':
2071 if (*argrest == 0)
2072 {
2073 if(++i < argc) argrest = argv[i]; else
2074 { badarg = TRUE; break; }
2075 }
2076 if (Ustrcmp(config_main_filelist, argrest) != 0)
2077 {
2078 #ifdef ALT_CONFIG_PREFIX
2079 int sep = 0;
2080 int len = Ustrlen(ALT_CONFIG_PREFIX);
2081 uschar *list = argrest;
2082 uschar *filename;
2083 while((filename = string_nextinlist(&list, &sep, big_buffer,
2084 big_buffer_size)) != NULL)
2085 {
2086 if ((Ustrlen(filename) < len ||
2087 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2088 Ustrstr(filename, "/../") != NULL) &&
2089 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2090 {
2091 fprintf(stderr, "-C Permission denied\n");
2092 exit(EXIT_FAILURE);
2093 }
2094 }
2095 #endif
2096 if (real_uid != root_uid)
2097 {
2098 #ifdef TRUSTED_CONFIG_LIST
2099
2100 if (real_uid != exim_uid
2101 #ifdef CONFIGURE_OWNER
2102 && real_uid != config_uid
2103 #endif
2104 )
2105 trusted_config = FALSE;
2106 else
2107 {
2108 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2109 if (trust_list)
2110 {
2111 struct stat statbuf;
2112
2113 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2114 (statbuf.st_uid != root_uid /* owner not root */
2115 #ifdef CONFIGURE_OWNER
2116 && statbuf.st_uid != config_uid /* owner not the special one */
2117 #endif
2118 ) || /* or */
2119 (statbuf.st_gid != root_gid /* group not root */
2120 #ifdef CONFIGURE_GROUP
2121 && statbuf.st_gid != config_gid /* group not the special one */
2122 #endif
2123 && (statbuf.st_mode & 020) != 0 /* group writeable */
2124 ) || /* or */
2125 (statbuf.st_mode & 2) != 0) /* world writeable */
2126 {
2127 trusted_config = FALSE;
2128 fclose(trust_list);
2129 }
2130 else
2131 {
2132 /* Well, the trust list at least is up to scratch... */
2133 void *reset_point = store_get(0);
2134 uschar *trusted_configs[32];
2135 int nr_configs = 0;
2136 int i = 0;
2137
2138 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2139 {
2140 uschar *start = big_buffer, *nl;
2141 while (*start && isspace(*start))
2142 start++;
2143 if (*start != '/')
2144 continue;
2145 nl = Ustrchr(start, '\n');
2146 if (nl)
2147 *nl = 0;
2148 trusted_configs[nr_configs++] = string_copy(start);
2149 if (nr_configs == 32)
2150 break;
2151 }
2152 fclose(trust_list);
2153
2154 if (nr_configs)
2155 {
2156 int sep = 0;
2157 uschar *list = argrest;
2158 uschar *filename;
2159 while (trusted_config && (filename = string_nextinlist(&list,
2160 &sep, big_buffer, big_buffer_size)) != NULL)
2161 {
2162 for (i=0; i < nr_configs; i++)
2163 {
2164 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2165 break;
2166 }
2167 if (i == nr_configs)
2168 {
2169 trusted_config = FALSE;
2170 break;
2171 }
2172 }
2173 store_reset(reset_point);
2174 }
2175 else
2176 {
2177 /* No valid prefixes found in trust_list file. */
2178 trusted_config = FALSE;
2179 }
2180 }
2181 }
2182 else
2183 {
2184 /* Could not open trust_list file. */
2185 trusted_config = FALSE;
2186 }
2187 }
2188 #else
2189 /* Not root; don't trust config */
2190 trusted_config = FALSE;
2191 #endif
2192 }
2193
2194 config_main_filelist = argrest;
2195 config_changed = TRUE;
2196 }
2197 break;
2198
2199
2200 /* -D: set up a macro definition */
2201
2202 case 'D':
2203 #ifdef DISABLE_D_OPTION
2204 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2205 exit(EXIT_FAILURE);
2206 #else
2207 {
2208 int ptr = 0;
2209 macro_item *mlast = NULL;
2210 macro_item *m;
2211 uschar name[24];
2212 uschar *s = argrest;
2213
2214 while (isspace(*s)) s++;
2215
2216 if (*s < 'A' || *s > 'Z')
2217 {
2218 fprintf(stderr, "exim: macro name set by -D must start with "
2219 "an upper case letter\n");
2220 exit(EXIT_FAILURE);
2221 }
2222
2223 while (isalnum(*s) || *s == '_')
2224 {
2225 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2226 s++;
2227 }
2228 name[ptr] = 0;
2229 if (ptr == 0) { badarg = TRUE; break; }
2230 while (isspace(*s)) s++;
2231 if (*s != 0)
2232 {
2233 if (*s++ != '=') { badarg = TRUE; break; }
2234 while (isspace(*s)) s++;
2235 }
2236
2237 for (m = macros; m != NULL; m = m->next)
2238 {
2239 if (Ustrcmp(m->name, name) == 0)
2240 {
2241 fprintf(stderr, "exim: duplicated -D in command line\n");
2242 exit(EXIT_FAILURE);
2243 }
2244 mlast = m;
2245 }
2246
2247 m = store_get(sizeof(macro_item) + Ustrlen(name));
2248 m->next = NULL;
2249 m->command_line = TRUE;
2250 if (mlast == NULL) macros = m; else mlast->next = m;
2251 Ustrcpy(m->name, name);
2252 m->replacement = string_copy(s);
2253
2254 if (clmacro_count >= MAX_CLMACROS)
2255 {
2256 fprintf(stderr, "exim: too many -D options on command line\n");
2257 exit(EXIT_FAILURE);
2258 }
2259 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2260 m->replacement);
2261 }
2262 #endif
2263 break;
2264
2265 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2266 The latter is now a no-op, retained for compatibility only. If -dd is used,
2267 debugging subprocesses of the daemon is disabled. */
2268
2269 case 'd':
2270 if (Ustrcmp(argrest, "ropcr") == 0)
2271 {
2272 /* drop_cr = TRUE; */
2273 }
2274
2275 /* Use an intermediate variable so that we don't set debugging while
2276 decoding the debugging bits. */
2277
2278 else
2279 {
2280 unsigned int selector = D_default;
2281 debug_selector = 0;
2282 debug_file = NULL;
2283 if (*argrest == 'd')
2284 {
2285 debug_daemon = TRUE;
2286 argrest++;
2287 }
2288 if (*argrest != 0)
2289 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2290 debug_options_count, US"debug", 0);
2291 debug_selector = selector;
2292 }
2293 break;
2294
2295
2296 /* -E: This is a local error message. This option is not intended for
2297 external use at all, but is not restricted to trusted callers because it
2298 does no harm (just suppresses certain error messages) and if Exim is run
2299 not setuid root it won't always be trusted when it generates error
2300 messages using this option. If there is a message id following -E, point
2301 message_reference at it, for logging. */
2302
2303 case 'E':
2304 local_error_message = TRUE;
2305 if (mac_ismsgid(argrest)) message_reference = argrest;
2306 break;
2307
2308
2309 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2310 option, so it looks as if historically the -oex options are also callable
2311 without the leading -o. So we have to accept them. Before the switch,
2312 anything starting -oe has been converted to -e. Exim does not support all
2313 of the sendmail error options. */
2314
2315 case 'e':
2316 if (Ustrcmp(argrest, "e") == 0)
2317 {
2318 arg_error_handling = ERRORS_SENDER;
2319 errors_sender_rc = EXIT_SUCCESS;
2320 }
2321 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2322 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2323 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2324 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2325 else badarg = TRUE;
2326 break;
2327
2328
2329 /* -F: Set sender's full name, used instead of the gecos entry from
2330 the password file. Since users can usually alter their gecos entries,
2331 there's no security involved in using this instead. The data can follow
2332 the -F or be in the next argument. */
2333
2334 case 'F':
2335 if (*argrest == 0)
2336 {
2337 if(++i < argc) argrest = argv[i]; else
2338 { badarg = TRUE; break; }
2339 }
2340 originator_name = argrest;
2341 sender_name_forced = TRUE;
2342 break;
2343
2344
2345 /* -f: Set sender's address - this value is only actually used if Exim is
2346 run by a trusted user, or if untrusted_set_sender is set and matches the
2347 address, except that the null address can always be set by any user. The
2348 test for this happens later, when the value given here is ignored when not
2349 permitted. For an untrusted user, the actual sender is still put in Sender:
2350 if it doesn't match the From: header (unless no_local_from_check is set).
2351 The data can follow the -f or be in the next argument. The -r switch is an
2352 obsolete form of -f but since there appear to be programs out there that
2353 use anything that sendmail has ever supported, better accept it - the
2354 synonymizing is done before the switch above.
2355
2356 At this stage, we must allow domain literal addresses, because we don't
2357 know what the setting of allow_domain_literals is yet. Ditto for trailing
2358 dots and strip_trailing_dot. */
2359
2360 case 'f':
2361 {
2362 int start, end;
2363 uschar *errmess;
2364 if (*argrest == 0)
2365 {
2366 if (i+1 < argc) argrest = argv[++i]; else
2367 { badarg = TRUE; break; }
2368 }
2369 if (*argrest == 0)
2370 {
2371 sender_address = string_sprintf(""); /* Ensure writeable memory */
2372 }
2373 else
2374 {
2375 uschar *temp = argrest + Ustrlen(argrest) - 1;
2376 while (temp >= argrest && isspace(*temp)) temp--;
2377 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2378 allow_domain_literals = TRUE;
2379 strip_trailing_dot = TRUE;
2380 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2381 &sender_address_domain, TRUE);
2382 allow_domain_literals = FALSE;
2383 strip_trailing_dot = FALSE;
2384 if (sender_address == NULL)
2385 {
2386 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2387 return EXIT_FAILURE;
2388 }
2389 }
2390 sender_address_forced = TRUE;
2391 }
2392 break;
2393
2394 /* This is some Sendmail thing which can be ignored */
2395
2396 case 'G':
2397 break;
2398
2399 /* -h: Set the hop count for an incoming message. Exim does not currently
2400 support this; it always computes it by counting the Received: headers.
2401 To put it in will require a change to the spool header file format. */
2402
2403 case 'h':
2404 if (*argrest == 0)
2405 {
2406 if(++i < argc) argrest = argv[i]; else
2407 { badarg = TRUE; break; }
2408 }
2409 if (!isdigit(*argrest)) badarg = TRUE;
2410 break;
2411
2412
2413 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2414 not to be documented for sendmail but mailx (at least) uses it) */
2415
2416 case 'i':
2417 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2418 break;
2419
2420
2421 case 'M':
2422 receiving_message = FALSE;
2423
2424 /* -MC: continue delivery of another message via an existing open
2425 file descriptor. This option is used for an internal call by the
2426 smtp transport when there is a pending message waiting to go to an
2427 address to which it has got a connection. Five subsequent arguments are
2428 required: transport name, host name, IP address, sequence number, and
2429 message_id. Transports may decline to create new processes if the sequence
2430 number gets too big. The channel is stdin. This (-MC) must be the last
2431 argument. There's a subsequent check that the real-uid is privileged.
2432
2433 If we are running in the test harness. delay for a bit, to let the process
2434 that set this one up complete. This makes for repeatability of the logging,
2435 etc. output. */
2436
2437 if (Ustrcmp(argrest, "C") == 0)
2438 {
2439 union sockaddr_46 interface_sock;
2440 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2441
2442 if (argc != i + 6)
2443 {
2444 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2445 return EXIT_FAILURE;
2446 }
2447
2448 if (msg_action_arg >= 0)
2449 {
2450 fprintf(stderr, "exim: incompatible arguments\n");
2451 return EXIT_FAILURE;
2452 }
2453
2454 continue_transport = argv[++i];
2455 continue_hostname = argv[++i];
2456 continue_host_address = argv[++i];
2457 continue_sequence = Uatoi(argv[++i]);
2458 msg_action = MSG_DELIVER;
2459 msg_action_arg = ++i;
2460 forced_delivery = TRUE;
2461 queue_run_pid = passed_qr_pid;
2462 queue_run_pipe = passed_qr_pipe;
2463
2464 if (!mac_ismsgid(argv[i]))
2465 {
2466 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2467 argv[i]);
2468 return EXIT_FAILURE;
2469 }
2470
2471 /* Set up $sending_ip_address and $sending_port */
2472
2473 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2474 &size) == 0)
2475 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2476 &sending_port);
2477 else
2478 {
2479 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2480 strerror(errno));
2481 return EXIT_FAILURE;
2482 }
2483
2484 if (running_in_test_harness) millisleep(500);
2485 break;
2486 }
2487
2488 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2489 precedes -MC (see above). The flag indicates that the host to which
2490 Exim is connected has accepted an AUTH sequence. */
2491
2492 else if (Ustrcmp(argrest, "CA") == 0)
2493 {
2494 smtp_authenticated = TRUE;
2495 break;
2496 }
2497
2498 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2499 it preceded -MC (see above) */
2500
2501 else if (Ustrcmp(argrest, "CP") == 0)
2502 {
2503 smtp_use_pipelining = TRUE;
2504 break;
2505 }
2506
2507 /* -MCQ: pass on the pid of the queue-running process that started
2508 this chain of deliveries and the fd of its synchronizing pipe; this
2509 is useful only when it precedes -MC (see above) */
2510
2511 else if (Ustrcmp(argrest, "CQ") == 0)
2512 {
2513 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2514 else badarg = TRUE;
2515 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2516 else badarg = TRUE;
2517 break;
2518 }
2519
2520 /* -MCS: set the smtp_use_size flag; this is useful only when it
2521 precedes -MC (see above) */
2522
2523 else if (Ustrcmp(argrest, "CS") == 0)
2524 {
2525 smtp_use_size = TRUE;
2526 break;
2527 }
2528
2529 /* -MCT: set the tls_offered flag; this is useful only when it
2530 precedes -MC (see above). The flag indicates that the host to which
2531 Exim is connected has offered TLS support. */
2532
2533 #ifdef SUPPORT_TLS
2534 else if (Ustrcmp(argrest, "CT") == 0)
2535 {
2536 tls_offered = TRUE;
2537 break;
2538 }
2539 #endif
2540
2541 /* -M[x]: various operations on the following list of message ids:
2542 -M deliver the messages, ignoring next retry times and thawing
2543 -Mc deliver the messages, checking next retry times, no thawing
2544 -Mf freeze the messages
2545 -Mg give up on the messages
2546 -Mt thaw the messages
2547 -Mrm remove the messages
2548 In the above cases, this must be the last option. There are also the
2549 following options which are followed by a single message id, and which
2550 act on that message. Some of them use the "recipient" addresses as well.
2551 -Mar add recipient(s)
2552 -Mmad mark all recipients delivered
2553 -Mmd mark recipients(s) delivered
2554 -Mes edit sender
2555 -Mset load a message for use with -be
2556 -Mvb show body
2557 -Mvc show copy (of whole message, in RFC 2822 format)
2558 -Mvh show header
2559 -Mvl show log
2560 */
2561
2562 else if (*argrest == 0)
2563 {
2564 msg_action = MSG_DELIVER;
2565 forced_delivery = deliver_force_thaw = TRUE;
2566 }
2567 else if (Ustrcmp(argrest, "ar") == 0)
2568 {
2569 msg_action = MSG_ADD_RECIPIENT;
2570 one_msg_action = TRUE;
2571 }
2572 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2573 else if (Ustrcmp(argrest, "es") == 0)
2574 {
2575 msg_action = MSG_EDIT_SENDER;
2576 one_msg_action = TRUE;
2577 }
2578 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2579 else if (Ustrcmp(argrest, "g") == 0)
2580 {
2581 msg_action = MSG_DELIVER;
2582 deliver_give_up = TRUE;
2583 }
2584 else if (Ustrcmp(argrest, "mad") == 0)
2585 {
2586 msg_action = MSG_MARK_ALL_DELIVERED;
2587 }
2588 else if (Ustrcmp(argrest, "md") == 0)
2589 {
2590 msg_action = MSG_MARK_DELIVERED;
2591 one_msg_action = TRUE;
2592 }
2593 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2594 else if (Ustrcmp(argrest, "set") == 0)
2595 {
2596 msg_action = MSG_LOAD;
2597 one_msg_action = TRUE;
2598 }
2599 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2600 else if (Ustrcmp(argrest, "vb") == 0)
2601 {
2602 msg_action = MSG_SHOW_BODY;
2603 one_msg_action = TRUE;
2604 }
2605 else if (Ustrcmp(argrest, "vc") == 0)
2606 {
2607 msg_action = MSG_SHOW_COPY;
2608 one_msg_action = TRUE;
2609 }
2610 else if (Ustrcmp(argrest, "vh") == 0)
2611 {
2612 msg_action = MSG_SHOW_HEADER;
2613 one_msg_action = TRUE;
2614 }
2615 else if (Ustrcmp(argrest, "vl") == 0)
2616 {
2617 msg_action = MSG_SHOW_LOG;
2618 one_msg_action = TRUE;
2619 }
2620 else { badarg = TRUE; break; }
2621
2622 /* All the -Mxx options require at least one message id. */
2623
2624 msg_action_arg = i + 1;
2625 if (msg_action_arg >= argc)
2626 {
2627 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2628 return EXIT_FAILURE;
2629 }
2630
2631 /* Some require only message ids to follow */
2632
2633 if (!one_msg_action)
2634 {
2635 int j;
2636 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2637 {
2638 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2639 argv[j], arg);
2640 return EXIT_FAILURE;
2641 }
2642 goto END_ARG; /* Remaining args are ids */
2643 }
2644
2645 /* Others require only one message id, possibly followed by addresses,
2646 which will be handled as normal arguments. */
2647
2648 else
2649 {
2650 if (!mac_ismsgid(argv[msg_action_arg]))
2651 {
2652 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2653 argv[msg_action_arg], arg);
2654 return EXIT_FAILURE;
2655 }
2656 i++;
2657 }
2658 break;
2659
2660
2661 /* Some programs seem to call the -om option without the leading o;
2662 for sendmail it askes for "me too". Exim always does this. */
2663
2664 case 'm':
2665 if (*argrest != 0) badarg = TRUE;
2666 break;
2667
2668
2669 /* -N: don't do delivery - a debugging option that stops transports doing
2670 their thing. It implies debugging at the D_v level. */
2671
2672 case 'N':
2673 if (*argrest == 0)
2674 {
2675 dont_deliver = TRUE;
2676 debug_selector |= D_v;
2677 debug_file = stderr;
2678 }
2679 else badarg = TRUE;
2680 break;
2681
2682
2683 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2684 it. */
2685
2686 case 'n':
2687 break;
2688
2689 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2690 option to the specified value. This form uses long names. We need to handle
2691 -O option=value and -Ooption=value. */
2692
2693 case 'O':
2694 if (*argrest == 0)
2695 {
2696 if (++i >= argc)
2697 {
2698 fprintf(stderr, "exim: string expected after -O\n");
2699 exit(EXIT_FAILURE);
2700 }
2701 }
2702 break;
2703
2704 case 'o':
2705
2706 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2707 file" option). */
2708
2709 if (*argrest == 'A')
2710 {
2711 alias_arg = argrest + 1;
2712 if (alias_arg[0] == 0)
2713 {
2714 if (i+1 < argc) alias_arg = argv[++i]; else
2715 {
2716 fprintf(stderr, "exim: string expected after -oA\n");
2717 exit(EXIT_FAILURE);
2718 }
2719 }
2720 }
2721
2722 /* -oB: Set a connection message max value for remote deliveries */
2723
2724 else if (*argrest == 'B')
2725 {
2726 uschar *p = argrest + 1;
2727 if (p[0] == 0)
2728 {
2729 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2730 {
2731 connection_max_messages = 1;
2732 p = NULL;
2733 }
2734 }
2735
2736 if (p != NULL)
2737 {
2738 if (!isdigit(*p))
2739 {
2740 fprintf(stderr, "exim: number expected after -oB\n");
2741 exit(EXIT_FAILURE);
2742 }
2743 connection_max_messages = Uatoi(p);
2744 }
2745 }
2746
2747 /* -odb: background delivery */
2748
2749 else if (Ustrcmp(argrest, "db") == 0)
2750 {
2751 synchronous_delivery = FALSE;
2752 arg_queue_only = FALSE;
2753 queue_only_set = TRUE;
2754 }
2755
2756 /* -odf: foreground delivery (smail-compatible option); same effect as
2757 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2758 */
2759
2760 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2761 {
2762 synchronous_delivery = TRUE;
2763 arg_queue_only = FALSE;
2764 queue_only_set = TRUE;
2765 }
2766
2767 /* -odq: queue only */
2768
2769 else if (Ustrcmp(argrest, "dq") == 0)
2770 {
2771 synchronous_delivery = FALSE;
2772 arg_queue_only = TRUE;
2773 queue_only_set = TRUE;
2774 }
2775
2776 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2777 but no remote delivery */
2778
2779 else if (Ustrcmp(argrest, "dqs") == 0)
2780 {
2781 queue_smtp = TRUE;
2782 arg_queue_only = FALSE;
2783 queue_only_set = TRUE;
2784 }
2785
2786 /* -oex: Sendmail error flags. As these are also accepted without the
2787 leading -o prefix, for compatibility with vacation and other callers,
2788 they are handled with -e above. */
2789
2790 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2791 -oitrue: Another sendmail syntax for the same */
2792
2793 else if (Ustrcmp(argrest, "i") == 0 ||
2794 Ustrcmp(argrest, "itrue") == 0)
2795 dot_ends = FALSE;
2796
2797 /* -oM*: Set various characteristics for an incoming message; actually
2798 acted on for trusted callers only. */
2799
2800 else if (*argrest == 'M')
2801 {
2802 if (i+1 >= argc)
2803 {
2804 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2805 exit(EXIT_FAILURE);
2806 }
2807
2808 /* -oMa: Set sender host address */
2809
2810 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2811
2812 /* -oMaa: Set authenticator name */
2813
2814 else if (Ustrcmp(argrest, "Maa") == 0)
2815 sender_host_authenticated = argv[++i];
2816
2817 /* -oMas: setting authenticated sender */
2818
2819 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2820
2821 /* -oMai: setting authenticated id */
2822
2823 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2824
2825 /* -oMi: Set incoming interface address */
2826
2827 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2828
2829 /* -oMr: Received protocol */
2830
2831 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2832
2833 /* -oMs: Set sender host name */
2834
2835 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2836
2837 /* -oMt: Set sender ident */
2838
2839 else if (Ustrcmp(argrest, "Mt") == 0)
2840 {
2841 sender_ident_set = TRUE;
2842 sender_ident = argv[++i];
2843 }
2844
2845 /* Else a bad argument */
2846
2847 else
2848 {
2849 badarg = TRUE;
2850 break;
2851 }
2852 }
2853
2854 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2855 seem to call this as -m (undocumented), so that is also accepted (see
2856 above). */
2857
2858 else if (Ustrcmp(argrest, "m") == 0) {}
2859
2860 /* -oo: An ancient flag for old-style addresses which still seems to
2861 crop up in some calls (see in SCO). */
2862
2863 else if (Ustrcmp(argrest, "o") == 0) {}
2864
2865 /* -oP <name>: set pid file path for daemon */
2866
2867 else if (Ustrcmp(argrest, "P") == 0)
2868 override_pid_file_path = argv[++i];
2869
2870 /* -or <n>: set timeout for non-SMTP acceptance
2871 -os <n>: set timeout for SMTP acceptance */
2872
2873 else if (*argrest == 'r' || *argrest == 's')
2874 {
2875 int *tp = (*argrest == 'r')?
2876 &arg_receive_timeout : &arg_smtp_receive_timeout;
2877 if (argrest[1] == 0)
2878 {
2879 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2880 }
2881 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2882 if (*tp < 0)
2883 {
2884 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2885 exit(EXIT_FAILURE);
2886 }
2887 }
2888
2889 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2890
2891 else if (Ustrcmp(argrest, "X") == 0)
2892 override_local_interfaces = argv[++i];
2893
2894 /* Unknown -o argument */
2895
2896 else badarg = TRUE;
2897 break;
2898
2899
2900 /* -ps: force Perl startup; -pd force delayed Perl startup */
2901
2902 case 'p':
2903 #ifdef EXIM_PERL
2904 if (*argrest == 's' && argrest[1] == 0)
2905 {
2906 perl_start_option = 1;
2907 break;
2908 }
2909 if (*argrest == 'd' && argrest[1] == 0)
2910 {
2911 perl_start_option = -1;
2912 break;
2913 }
2914 #endif
2915
2916 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2917 which sets the host protocol and host name */
2918
2919 if (*argrest == 0)
2920 {
2921 if (i+1 < argc) argrest = argv[++i]; else
2922 { badarg = TRUE; break; }
2923 }
2924
2925 if (*argrest != 0)
2926 {
2927 uschar *hn = Ustrchr(argrest, ':');
2928 if (hn == NULL)
2929 {
2930 received_protocol = argrest;
2931 }
2932 else
2933 {
2934 received_protocol = string_copyn(argrest, hn - argrest);
2935 sender_host_name = hn + 1;
2936 }
2937 }
2938 break;
2939
2940
2941 case 'q':
2942 receiving_message = FALSE;
2943 if (queue_interval >= 0)
2944 {
2945 fprintf(stderr, "exim: -q specified more than once\n");
2946 exit(EXIT_FAILURE);
2947 }
2948
2949 /* -qq...: Do queue runs in a 2-stage manner */
2950
2951 if (*argrest == 'q')
2952 {
2953 queue_2stage = TRUE;
2954 argrest++;
2955 }
2956
2957 /* -qi...: Do only first (initial) deliveries */
2958
2959 if (*argrest == 'i')
2960 {
2961 queue_run_first_delivery = TRUE;
2962 argrest++;
2963 }
2964
2965 /* -qf...: Run the queue, forcing deliveries
2966 -qff..: Ditto, forcing thawing as well */
2967
2968 if (*argrest == 'f')
2969 {
2970 queue_run_force = TRUE;
2971 if (*(++argrest) == 'f')
2972 {
2973 deliver_force_thaw = TRUE;
2974 argrest++;
2975 }
2976 }
2977
2978 /* -q[f][f]l...: Run the queue only on local deliveries */
2979
2980 if (*argrest == 'l')
2981 {
2982 queue_run_local = TRUE;
2983 argrest++;
2984 }
2985
2986 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2987 optionally starting from a given message id. */
2988
2989 if (*argrest == 0 &&
2990 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2991 {
2992 queue_interval = 0;
2993 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2994 start_queue_run_id = argv[++i];
2995 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2996 stop_queue_run_id = argv[++i];
2997 }
2998
2999 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3000 optionally local only. */
3001
3002 else
3003 {
3004 if (*argrest != 0)
3005 queue_interval = readconf_readtime(argrest, 0, FALSE);
3006 else
3007 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3008 if (queue_interval <= 0)
3009 {
3010 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3011 exit(EXIT_FAILURE);
3012 }
3013 }
3014 break;
3015
3016
3017 case 'R': /* Synonymous with -qR... */
3018 receiving_message = FALSE;
3019
3020 /* -Rf: As -R (below) but force all deliveries,
3021 -Rff: Ditto, but also thaw all frozen messages,
3022 -Rr: String is regex
3023 -Rrf: Regex and force
3024 -Rrff: Regex and force and thaw
3025
3026 in all cases provided there are no further characters in this
3027 argument. */
3028
3029 if (*argrest != 0)
3030 {
3031 int i;
3032 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3033 {
3034 if (Ustrcmp(argrest, rsopts[i]) == 0)
3035 {
3036 if (i != 2) queue_run_force = TRUE;
3037 if (i >= 2) deliver_selectstring_regex = TRUE;
3038 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3039 argrest += Ustrlen(rsopts[i]);
3040 }
3041 }
3042 }
3043
3044 /* -R: Set string to match in addresses for forced queue run to
3045 pick out particular messages. */
3046
3047 if (*argrest == 0)
3048 {
3049 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3050 {
3051 fprintf(stderr, "exim: string expected after -R\n");
3052 exit(EXIT_FAILURE);
3053 }
3054 }
3055 else deliver_selectstring = argrest;
3056 break;
3057
3058
3059 /* -r: an obsolete synonym for -f (see above) */
3060
3061
3062 /* -S: Like -R but works on sender. */
3063
3064 case 'S': /* Synonymous with -qS... */
3065 receiving_message = FALSE;
3066
3067 /* -Sf: As -S (below) but force all deliveries,
3068 -Sff: Ditto, but also thaw all frozen messages,
3069 -Sr: String is regex
3070 -Srf: Regex and force
3071 -Srff: Regex and force and thaw
3072
3073 in all cases provided there are no further characters in this
3074 argument. */
3075
3076 if (*argrest != 0)
3077 {
3078 int i;
3079 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3080 {
3081 if (Ustrcmp(argrest, rsopts[i]) == 0)
3082 {
3083 if (i != 2) queue_run_force = TRUE;
3084 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3085 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3086 argrest += Ustrlen(rsopts[i]);
3087 }
3088 }
3089 }
3090
3091 /* -S: Set string to match in addresses for forced queue run to
3092 pick out particular messages. */
3093
3094 if (*argrest == 0)
3095 {
3096 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3097 {
3098 fprintf(stderr, "exim: string expected after -S\n");
3099 exit(EXIT_FAILURE);
3100 }
3101 }
3102 else deliver_selectstring_sender = argrest;
3103 break;
3104
3105 /* -Tqt is an option that is exclusively for use by the testing suite.
3106 It is not recognized in other circumstances. It allows for the setting up
3107 of explicit "queue times" so that various warning/retry things can be
3108 tested. Otherwise variability of clock ticks etc. cause problems. */
3109
3110 case 'T':
3111 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3112 fudged_queue_times = argv[++i];
3113 else badarg = TRUE;
3114 break;
3115
3116
3117 /* -t: Set flag to extract recipients from body of message. */
3118
3119 case 't':
3120 if (*argrest == 0) extract_recipients = TRUE;
3121
3122 /* -ti: Set flag to extract recipients from body of message, and also
3123 specify that dot does not end the message. */
3124
3125 else if (Ustrcmp(argrest, "i") == 0)
3126 {
3127 extract_recipients = TRUE;
3128 dot_ends = FALSE;
3129 }
3130
3131 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3132
3133 #ifdef SUPPORT_TLS
3134 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
3135 #endif
3136
3137 else badarg = TRUE;
3138 break;
3139
3140
3141 /* -U: This means "initial user submission" in sendmail, apparently. The
3142 doc claims that in future sendmail may refuse syntactically invalid
3143 messages instead of fixing them. For the moment, we just ignore it. */
3144
3145 case 'U':
3146 break;
3147
3148
3149 /* -v: verify things - this is a very low-level debugging */
3150
3151 case 'v':
3152 if (*argrest == 0)
3153 {
3154 debug_selector |= D_v;
3155 debug_file = stderr;
3156 }
3157 else badarg = TRUE;
3158 break;
3159
3160
3161 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3162
3163 The -x flag tells the sendmail command that mail from a local
3164 mail program has National Language Support (NLS) extended characters
3165 in the body of the mail item. The sendmail command can send mail with
3166 extended NLS characters across networks that normally corrupts these
3167 8-bit characters.
3168
3169 As Exim is 8-bit clean, it just ignores this flag. */
3170
3171 case 'x':
3172 if (*argrest != 0) badarg = TRUE;
3173 break;
3174
3175 /* All other initial characters are errors */
3176
3177 default:
3178 badarg = TRUE;
3179 break;
3180 } /* End of high-level switch statement */
3181
3182 /* Failed to recognize the option, or syntax error */
3183
3184 if (badarg)
3185 {
3186 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3187 "option %s\n", arg);
3188 exit(EXIT_FAILURE);
3189 }
3190 }
3191
3192
3193 /* If -R or -S have been specified without -q, assume a single queue run. */
3194
3195 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3196 queue_interval < 0) queue_interval = 0;
3197
3198
3199 END_ARG:
3200 /* If usage_wanted is set we call the usage function - which never returns */
3201 if (usage_wanted) exim_usage(called_as);
3202
3203 /* Arguments have been processed. Check for incompatibilities. */
3204 if ((
3205 (smtp_input || extract_recipients || recipients_arg < argc) &&
3206 (daemon_listen || queue_interval >= 0 || bi_option ||
3207 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3208 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3209 ) ||
3210 (
3211 msg_action_arg > 0 &&
3212 (daemon_listen || queue_interval >= 0 || list_options ||
3213 (checking && msg_action != MSG_LOAD) ||
3214 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3215 ) ||
3216 (
3217 (daemon_listen || queue_interval >= 0) &&
3218 (sender_address != NULL || list_options || list_queue || checking ||
3219 bi_option)
3220 ) ||
3221 (
3222 daemon_listen && queue_interval == 0
3223 ) ||
3224 (
3225 list_options &&
3226 (checking || smtp_input || extract_recipients ||
3227 filter_test != FTEST_NONE || bi_option)
3228 ) ||
3229 (
3230 verify_address_mode &&
3231 (address_test_mode || smtp_input || extract_recipients ||
3232 filter_test != FTEST_NONE || bi_option)
3233 ) ||
3234 (
3235 address_test_mode && (smtp_input || extract_recipients ||
3236 filter_test != FTEST_NONE || bi_option)
3237 ) ||
3238 (
3239 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3240 extract_recipients)
3241 ) ||
3242 (
3243 deliver_selectstring != NULL && queue_interval < 0
3244 ) ||
3245 (
3246 msg_action == MSG_LOAD &&
3247 (!expansion_test || expansion_test_message != NULL)
3248 )
3249 )
3250 {
3251 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3252 exit(EXIT_FAILURE);
3253 }
3254
3255 /* If debugging is set up, set the file and the file descriptor to pass on to
3256 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3257 to run in the foreground. */
3258
3259 if (debug_selector != 0)
3260 {
3261 debug_file = stderr;
3262 debug_fd = fileno(debug_file);
3263 background_daemon = FALSE;
3264 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3265 if (debug_selector != D_v) /* -v only doesn't show this */
3266 {
3267 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3268 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3269 debug_selector);
3270 if (!version_printed)
3271 show_whats_supported(stderr);
3272 }
3273 }
3274
3275 /* When started with root privilege, ensure that the limits on the number of
3276 open files and the number of processes (where that is accessible) are
3277 sufficiently large, or are unset, in case Exim has been called from an
3278 environment where the limits are screwed down. Not all OS have the ability to
3279 change some of these limits. */
3280
3281 if (unprivileged)
3282 {
3283 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3284 }
3285 else
3286 {
3287 struct rlimit rlp;
3288
3289 #ifdef RLIMIT_NOFILE
3290 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3291 {
3292 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3293 strerror(errno));
3294 rlp.rlim_cur = rlp.rlim_max = 0;
3295 }
3296
3297 /* I originally chose 1000 as a nice big number that was unlikely to
3298 be exceeded. It turns out that some older OS have a fixed upper limit of
3299 256. */
3300
3301 if (rlp.rlim_cur < 1000)
3302 {
3303 rlp.rlim_cur = rlp.rlim_max = 1000;
3304 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3305 {
3306 rlp.rlim_cur = rlp.rlim_max = 256;
3307 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3308 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3309 strerror(errno));
3310 }
3311 }
3312 #endif
3313
3314 #ifdef RLIMIT_NPROC
3315 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3316 {
3317 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3318 strerror(errno));
3319 rlp.rlim_cur = rlp.rlim_max = 0;
3320 }
3321
3322 #ifdef RLIM_INFINITY
3323 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3324 {
3325 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3326 #else
3327 if (rlp.rlim_cur < 1000)
3328 {
3329 rlp.rlim_cur = rlp.rlim_max = 1000;
3330 #endif
3331 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3332 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3333 strerror(errno));
3334 }
3335 #endif
3336 }
3337
3338 /* Exim is normally entered as root (but some special configurations are
3339 possible that don't do this). However, it always spins off sub-processes that
3340 set their uid and gid as required for local delivery. We don't want to pass on
3341 any extra groups that root may belong to, so we want to get rid of them all at
3342 this point.
3343
3344 We need to obey setgroups() at this stage, before possibly giving up root
3345 privilege for a changed configuration file, but later on we might need to
3346 check on the additional groups for the admin user privilege - can't do that
3347 till after reading the config, which might specify the exim gid. Therefore,
3348 save the group list here first. */
3349
3350 group_count = getgroups(NGROUPS_MAX, group_list);
3351 if (group_count < 0)
3352 {
3353 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3354 exit(EXIT_FAILURE);
3355 }
3356
3357 /* There is a fundamental difference in some BSD systems in the matter of
3358 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3359 known not to be different. On the "different" systems there is a single group
3360 list, and the first entry in it is the current group. On all other versions of
3361 Unix there is a supplementary group list, which is in *addition* to the current
3362 group. Consequently, to get rid of all extraneous groups on a "standard" system
3363 you pass over 0 groups to setgroups(), while on a "different" system you pass
3364 over a single group - the current group, which is always the first group in the
3365 list. Calling setgroups() with zero groups on a "different" system results in
3366 an error return. The following code should cope with both types of system.
3367
3368 However, if this process isn't running as root, setgroups() can't be used
3369 since you have to be root to run it, even if throwing away groups. Not being
3370 root here happens only in some unusual configurations. We just ignore the
3371 error. */
3372
3373 if (setgroups(0, NULL) != 0)
3374 {
3375 if (setgroups(1, group_list) != 0 && !unprivileged)
3376 {
3377 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3378 exit(EXIT_FAILURE);
3379 }
3380 }
3381
3382 /* If the configuration file name has been altered by an argument on the
3383 command line (either a new file name or a macro definition) and the caller is
3384 not root, or if this is a filter testing run, remove any setuid privilege the
3385 program has and run as the underlying user.
3386
3387 The exim user is locked out of this, which severely restricts the use of -C
3388 for some purposes.
3389
3390 Otherwise, set the real ids to the effective values (should be root unless run
3391 from inetd, which it can either be root or the exim uid, if one is configured).
3392
3393 There is a private mechanism for bypassing some of this, in order to make it
3394 possible to test lots of configurations automatically, without having either to
3395 recompile each time, or to patch in an actual configuration file name and other
3396 values (such as the path name). If running in the test harness, pretend that
3397 configuration file changes and macro definitions haven't happened. */
3398
3399 if (( /* EITHER */
3400 (!trusted_config || /* Config changed, or */
3401 !macros_trusted()) && /* impermissible macros and */
3402 real_uid != root_uid && /* Not root, and */
3403 !running_in_test_harness /* Not fudged */
3404 ) || /* OR */
3405 expansion_test /* expansion testing */
3406 || /* OR */
3407 filter_test != FTEST_NONE) /* Filter testing */
3408 {
3409 setgroups(group_count, group_list);
3410 exim_setugid(real_uid, real_gid, FALSE,
3411 US"-C, -D, -be or -bf forces real uid");
3412 removed_privilege = TRUE;
3413
3414 /* In the normal case when Exim is called like this, stderr is available
3415 and should be used for any logging information because attempts to write
3416 to the log will usually fail. To arrange this, we unset really_exim. However,
3417 if no stderr is available there is no point - we might as well have a go
3418 at the log (if it fails, syslog will be written).
3419
3420 Note that if the invoker is Exim, the logs remain available. Messing with
3421 this causes unlogged successful deliveries. */
3422
3423 if ((log_stderr != NULL) && (real_uid != exim_uid))
3424 really_exim = FALSE;
3425 }
3426
3427 /* Privilege is to be retained for the moment. It may be dropped later,
3428 depending on the job that this Exim process has been asked to do. For now, set
3429 the real uid to the effective so that subsequent re-execs of Exim are done by a
3430 privileged user. */
3431
3432 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3433
3434 /* If testing a filter, open the file(s) now, before wasting time doing other
3435 setups and reading the message. */
3436
3437 if ((filter_test & FTEST_SYSTEM) != 0)
3438 {
3439 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3440 if (filter_sfd < 0)
3441 {
3442 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3443 strerror(errno));
3444 return EXIT_FAILURE;
3445 }
3446 }
3447
3448 if ((filter_test & FTEST_USER) != 0)
3449 {
3450 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3451 if (filter_ufd < 0)
3452 {
3453 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3454 strerror(errno));
3455 return EXIT_FAILURE;
3456 }
3457 }
3458
3459 /* Initialise lookup_list
3460 If debugging, already called above via version reporting.
3461 In either case, we initialise the list of available lookups while running
3462 as root. All dynamically modules are loaded from a directory which is
3463 hard-coded into the binary and is code which, if not a module, would be
3464 part of Exim already. Ability to modify the content of the directory
3465 is equivalent to the ability to modify a setuid binary!
3466
3467 This needs to happen before we read the main configuration. */
3468 init_lookup_list();
3469
3470 /* Read the main runtime configuration data; this gives up if there
3471 is a failure. It leaves the configuration file open so that the subsequent
3472 configuration data for delivery can be read if needed. */
3473
3474 readconf_main();
3475
3476 /* Handle the decoding of logging options. */
3477
3478 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3479 log_selector_string, log_options, log_options_count, US"log", 0);
3480
3481 DEBUG(D_any)
3482 {
3483 debug_printf("configuration file is %s\n", config_main_filename);
3484 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3485 log_extra_selector);
3486 }
3487
3488 /* If domain literals are not allowed, check the sender address that was
3489 supplied with -f. Ditto for a stripped trailing dot. */
3490
3491 if (sender_address != NULL)
3492 {
3493 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3494 {
3495 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3496 "allowed\n", sender_address);
3497 return EXIT_FAILURE;
3498 }
3499 if (f_end_dot && !strip_trailing_dot)
3500 {
3501 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3502 "(trailing dot not allowed)\n", sender_address);
3503 return EXIT_FAILURE;
3504 }
3505 }
3506
3507 /* Paranoia check of maximum lengths of certain strings. There is a check
3508 on the length of the log file path in log.c, which will come into effect
3509 if there are any calls to write the log earlier than this. However, if we
3510 get this far but the string is very long, it is better to stop now than to
3511 carry on and (e.g.) receive a message and then have to collapse. The call to
3512 log_write() from here will cause the ultimate panic collapse if the complete
3513 file name exceeds the buffer length. */
3514
3515 if (Ustrlen(log_file_path) > 200)
3516 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3517 "log_file_path is longer than 200 chars: aborting");
3518
3519 if (Ustrlen(pid_file_path) > 200)
3520 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3521 "pid_file_path is longer than 200 chars: aborting");
3522
3523 if (Ustrlen(spool_directory) > 200)
3524 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3525 "spool_directory is longer than 200 chars: aborting");
3526
3527 /* Length check on the process name given to syslog for its TAG field,
3528 which is only permitted to be 32 characters or less. See RFC 3164. */
3529
3530 if (Ustrlen(syslog_processname) > 32)
3531 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3532 "syslog_processname is longer than 32 chars: aborting");
3533
3534 /* In some operating systems, the environment variable TMPDIR controls where
3535 temporary files are created; Exim doesn't use these (apart from when delivering
3536 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3537 If TMPDIR is found in the environment, reset it to the value defined in the
3538 TMPDIR macro, if this macro is defined. */
3539
3540 #ifdef TMPDIR
3541 {
3542 uschar **p;
3543 for (p = USS environ; *p != NULL; p++)
3544 {
3545 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3546 Ustrcmp(*p+7, TMPDIR) != 0)
3547 {
3548 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3549 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3550 *p = newp;
3551 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3552 }
3553 }
3554 }
3555 #endif
3556
3557 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3558 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3559 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3560 called by a user who has set the TZ variable. This then affects the timestamps
3561 in log files and in Received: headers, and any created Date: header lines. The
3562 required timezone is settable in the configuration file, so nothing can be done
3563 about this earlier - but hopefully nothing will normally be logged earlier than
3564 this. We have to make a new environment if TZ is wrong, but don't bother if
3565 timestamps_utc is set, because then all times are in UTC anyway. */
3566
3567 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3568 {
3569 timestamps_utc = TRUE;
3570 }
3571 else
3572 {
3573 uschar *envtz = US getenv("TZ");
3574 if ((envtz == NULL && timezone_string != NULL) ||
3575 (envtz != NULL &&
3576 (timezone_string == NULL ||
3577 Ustrcmp(timezone_string, envtz) != 0)))
3578 {
3579 uschar **p = USS environ;
3580 uschar **new;
3581 uschar **newp;
3582 int count = 0;
3583 while (*p++ != NULL) count++;
3584 if (envtz == NULL) count++;
3585 newp = new = malloc(sizeof(uschar *) * (count + 1));
3586 for (p = USS environ; *p != NULL; p++)
3587 {
3588 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3589 *newp++ = *p;
3590 }
3591 if (timezone_string != NULL)
3592 {
3593 *newp = malloc(Ustrlen(timezone_string) + 4);
3594 sprintf(CS *newp++, "TZ=%s", timezone_string);
3595 }
3596 *newp = NULL;
3597 environ = CSS new;
3598 tzset();
3599 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3600 tod_stamp(tod_log));
3601 }
3602 }
3603
3604 /* Handle the case when we have removed the setuid privilege because of -C or
3605 -D. This means that the caller of Exim was not root.
3606
3607 There is a problem if we were running as the Exim user. The sysadmin may
3608 expect this case to retain privilege because "the binary was called by the
3609 Exim user", but it hasn't, because either the -D option set macros, or the
3610 -C option set a non-trusted configuration file. There are two possibilities:
3611
3612 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3613 to do message deliveries. Thus, the fact that it is running as a
3614 non-privileged user is plausible, and might be wanted in some special
3615 configurations. However, really_exim will have been set false when
3616 privilege was dropped, to stop Exim trying to write to its normal log
3617 files. Therefore, re-enable normal log processing, assuming the sysadmin
3618 has set up the log directory correctly.
3619
3620 (2) If deliver_drop_privilege is not set, the configuration won't work as
3621 apparently intended, and so we log a panic message. In order to retain
3622 root for -C or -D, the caller must either be root or be invoking a
3623 trusted configuration file (when deliver_drop_privilege is false). */
3624
3625 if (removed_privilege && (!trusted_config || macros != NULL) &&
3626 real_uid == exim_uid)
3627 {
3628 if (deliver_drop_privilege)
3629 really_exim = TRUE; /* let logging work normally */
3630 else
3631 log_write(0, LOG_MAIN|LOG_PANIC,
3632 "exim user lost privilege for using %s option",
3633 trusted_config? "-D" : "-C");
3634 }
3635
3636 /* Start up Perl interpreter if Perl support is configured and there is a
3637 perl_startup option, and the configuration or the command line specifies
3638 initializing starting. Note that the global variables are actually called
3639 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3640
3641 #ifdef EXIM_PERL
3642 if (perl_start_option != 0)
3643 opt_perl_at_start = (perl_start_option > 0);
3644 if (opt_perl_at_start && opt_perl_startup != NULL)
3645 {
3646 uschar *errstr;
3647 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3648 errstr = init_perl(opt_perl_startup);
3649 if (errstr != NULL)
3650 {
3651 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3652 return EXIT_FAILURE;
3653 }
3654 opt_perl_started = TRUE;
3655 }
3656 #endif /* EXIM_PERL */
3657
3658 /* Log the arguments of the call if the configuration file said so. This is
3659 a debugging feature for finding out what arguments certain MUAs actually use.
3660 Don't attempt it if logging is disabled, or if listing variables or if
3661 verifying/testing addresses or expansions. */
3662
3663 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3664 && really_exim && !list_options && !checking)
3665 {
3666 int i;
3667 uschar *p = big_buffer;
3668 Ustrcpy(p, "cwd=");
3669 (void)getcwd(CS p+4, big_buffer_size - 4);
3670 while (*p) p++;
3671 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3672 while (*p) p++;
3673 for (i = 0; i < argc; i++)
3674 {
3675 int len = Ustrlen(argv[i]);
3676 uschar *printing;
3677 uschar *quote;
3678 if (p + len + 8 >= big_buffer + big_buffer_size)
3679 {
3680 Ustrcpy(p, " ...");
3681 log_write(0, LOG_MAIN, "%s", big_buffer);
3682 Ustrcpy(big_buffer, "...");
3683 p = big_buffer + 3;
3684 }
3685 printing = string_printing(argv[i]);
3686 if (printing[0] == 0) quote = US"\""; else
3687 {
3688 uschar *pp = printing;
3689 quote = US"";
3690 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3691 }
3692 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3693 (p - big_buffer) - 4), printing, quote);
3694 while (*p) p++;
3695 }
3696
3697 if ((log_extra_selector & LX_arguments) != 0)
3698 log_write(0, LOG_MAIN, "%s", big_buffer);
3699 else
3700 debug_printf("%s\n", big_buffer);
3701 }
3702
3703 /* Set the working directory to be the top-level spool directory. We don't rely
3704 on this in the code, which always uses fully qualified names, but it's useful
3705 for core dumps etc. Don't complain if it fails - the spool directory might not
3706 be generally accessible and calls with the -C option (and others) have lost
3707 privilege by now. Before the chdir, we try to ensure that the directory exists.
3708 */
3709
3710 if (Uchdir(spool_directory) != 0)
3711 {
3712 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3713 (void)Uchdir(spool_directory);
3714 }
3715
3716 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3717 alias file. Exim doesn't have such a concept, but this call is screwed into
3718 Sun's YP makefiles. Handle this by calling a configured script, as the real
3719 user who called Exim. The -oA option can be used to pass an argument to the
3720 script. */
3721
3722 if (bi_option)
3723 {
3724 (void)fclose(config_file);
3725 if (bi_command != NULL)
3726 {
3727 int i = 0;
3728 uschar *argv[3];
3729 argv[i++] = bi_command;
3730 if (alias_arg != NULL) argv[i++] = alias_arg;
3731 argv[i++] = NULL;
3732
3733 setgroups(group_count, group_list);
3734 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3735
3736 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3737 (argv[1] == NULL)? US"" : argv[1]);
3738
3739 execv(CS argv[0], (char *const *)argv);
3740 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3741 exit(EXIT_FAILURE);
3742 }
3743 else
3744 {
3745 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3746 exit(EXIT_SUCCESS);
3747 }
3748 }
3749
3750 /* If an action on specific messages is requested, or if a daemon or queue
3751 runner is being started, we need to know if Exim was called by an admin user.
3752 This is the case if the real user is root or exim, or if the real group is
3753 exim, or if one of the supplementary groups is exim or a group listed in
3754 admin_groups. We don't fail all message actions immediately if not admin_user,
3755 since some actions can be performed by non-admin users. Instead, set admin_user
3756 for later interrogation. */
3757
3758 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3759 admin_user = TRUE;
3760 else
3761 {
3762 int i, j;
3763 for (i = 0; i < group_count; i++)
3764 {
3765 if (group_list[i] == exim_gid) admin_user = TRUE;
3766 else if (admin_groups != NULL)
3767 {
3768 for (j = 1; j <= (int)(admin_groups[0]); j++)
3769 if (admin_groups[j] == group_list[i])
3770 { admin_user = TRUE; break; }
3771 }
3772 if (admin_user) break;
3773 }
3774 }
3775
3776 /* Another group of privileged users are the trusted users. These are root,
3777 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3778 are permitted to specify sender_addresses with -f on the command line, and
3779 other message parameters as well. */
3780
3781 if (real_uid == root_uid || real_uid == exim_uid)
3782 trusted_caller = TRUE;
3783 else
3784 {
3785 int i, j;
3786
3787 if (trusted_users != NULL)
3788 {
3789 for (i = 1; i <= (int)(trusted_users[0]); i++)
3790 if (trusted_users[i] == real_uid)
3791 { trusted_caller = TRUE; break; }
3792 }
3793
3794 if (!trusted_caller && trusted_groups != NULL)
3795 {
3796 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3797 {
3798 if (trusted_groups[i] == real_gid)
3799 trusted_caller = TRUE;
3800 else for (j = 0; j < group_count; j++)
3801 {
3802 if (trusted_groups[i] == group_list[j])
3803 { trusted_caller = TRUE; break; }
3804 }
3805 if (trusted_caller) break;
3806 }
3807 }
3808 }
3809
3810 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3811 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3812
3813 /* Only an admin user may start the daemon or force a queue run in the default
3814 configuration, but the queue run restriction can be relaxed. Only an admin
3815 user may request that a message be returned to its sender forthwith. Only an
3816 admin user may specify a debug level greater than D_v (because it might show
3817 passwords, etc. in lookup queries). Only an admin user may request a queue
3818 count. Only an admin user can use the test interface to scan for email
3819 (because Exim will be in the spool dir and able to look at mails). */
3820
3821 if (!admin_user)
3822 {
3823 BOOL debugset = (debug_selector & ~D_v) != 0;
3824 if (deliver_give_up || daemon_listen || malware_test_file ||
3825 (count_queue && queue_list_requires_admin) ||
3826 (list_queue && queue_list_requires_admin) ||
3827 (queue_interval >= 0 && prod_requires_admin) ||
3828 (debugset && !running_in_test_harness))
3829 {
3830 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3831 exit(EXIT_FAILURE);
3832 }
3833 }
3834
3835 /* If the real user is not root or the exim uid, the argument for passing
3836 in an open TCP/IP connection for another message is not permitted, nor is
3837 running with the -N option for any delivery action, unless this call to exim is
3838 one that supplied an input message, or we are using a patched exim for
3839 regression testing. */
3840
3841 if (real_uid != root_uid && real_uid != exim_uid &&
3842 (continue_hostname != NULL ||
3843 (dont_deliver &&
3844 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3845 )) && !running_in_test_harness)
3846 {
3847 fprintf(stderr, "exim: Permission denied\n");
3848 return EXIT_FAILURE;
3849 }
3850
3851 /* If the caller is not trusted, certain arguments are ignored when running for
3852 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3853 Note that authority for performing certain actions on messages is tested in the
3854 queue_action() function. */
3855
3856 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3857 {
3858 sender_host_name = sender_host_address = interface_address =
3859 sender_ident = received_protocol = NULL;
3860 sender_host_port = interface_port = 0;
3861 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3862 }
3863
3864 /* If a sender host address is set, extract the optional port number off the
3865 end of it and check its syntax. Do the same thing for the interface address.
3866 Exim exits if the syntax is bad. */
3867
3868 else
3869 {
3870 if (sender_host_address != NULL)
3871 sender_host_port = check_port(sender_host_address);
3872 if (interface_address != NULL)
3873 interface_port = check_port(interface_address);
3874 }
3875
3876 /* If an SMTP message is being received check to see if the standard input is a
3877 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3878 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3879 barf. */
3880
3881 if (smtp_input)
3882 {
3883 union sockaddr_46 inetd_sock;
3884 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3885 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3886 {
3887 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3888 if (family == AF_INET || family == AF_INET6)
3889 {
3890 union sockaddr_46 interface_sock;
3891 size = sizeof(interface_sock);
3892
3893 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3894 interface_address = host_ntoa(-1, &interface_sock, NULL,
3895 &interface_port);
3896
3897 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3898
3899 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3900 {
3901 is_inetd = TRUE;
3902 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3903 NULL, &sender_host_port);
3904 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3905 "inetd is not supported when mua_wrapper is set");
3906 }
3907 else
3908 {
3909 fprintf(stderr,
3910 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3911 return EXIT_FAILURE;
3912 }
3913 }
3914 }
3915 }
3916
3917 /* If the load average is going to be needed while receiving a message, get it
3918 now for those OS that require the first call to os_getloadavg() to be done as
3919 root. There will be further calls later for each message received. */
3920
3921 #ifdef LOAD_AVG_NEEDS_ROOT
3922 if (receiving_message &&
3923 (queue_only_load >= 0 ||
3924 (is_inetd && smtp_load_reserve >= 0)
3925 ))
3926 {
3927 load_average = OS_GETLOADAVG();
3928 }
3929 #endif
3930
3931 /* The queue_only configuration option can be overridden by -odx on the command
3932 line, except that if queue_only_override is false, queue_only cannot be unset
3933 from the command line. */
3934
3935 if (queue_only_set && (queue_only_override || arg_queue_only))
3936 queue_only = arg_queue_only;
3937
3938 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3939 -or and -os. */
3940
3941 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3942 if (arg_smtp_receive_timeout >= 0)
3943 smtp_receive_timeout = arg_smtp_receive_timeout;
3944
3945 /* If Exim was started with root privilege, unless we have already removed the
3946 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3947 except when starting the daemon or doing some kind of delivery or address
3948 testing (-bt). These are the only cases when root need to be retained. We run
3949 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3950 retained only for starting the daemon. We always do the initgroups() in this
3951 situation (controlled by the TRUE below), in order to be as close as possible
3952 to the state Exim usually runs in. */
3953
3954 if (!unprivileged && /* originally had root AND */
3955 !removed_privilege && /* still got root AND */
3956 !daemon_listen && /* not starting the daemon */
3957 queue_interval <= 0 && /* (either kind of daemon) */
3958 ( /* AND EITHER */
3959 deliver_drop_privilege || /* requested unprivileged */
3960 ( /* OR */
3961 queue_interval < 0 && /* not running the queue */
3962 (msg_action_arg < 0 || /* and */
3963 msg_action != MSG_DELIVER) && /* not delivering and */
3964 (!checking || !address_test_mode) /* not address checking */
3965 )
3966 ))
3967 {
3968 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3969 }
3970
3971 /* When we are retaining a privileged uid, we still change to the exim gid. */
3972
3973 else
3974 {
3975 int rv;
3976 rv = setgid(exim_gid);
3977 /* Impact of failure is that some stuff might end up with an incorrect group.
3978 We track this for failures from root, since any attempt to change privilege
3979 by root should succeed and failures should be examined. For non-root,
3980 there's no security risk. For me, it's { exim -bV } on a just-built binary,
3981 no need to complain then. */
3982 if (rv == -1)
3983 {
3984 if (!(unprivileged || removed_privilege))
3985 {
3986 fprintf(stderr,
3987 "exim: changing group failed: %s\n", strerror(errno));
3988 exit(EXIT_FAILURE);
3989 }
3990 else
3991 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
3992 (long int)exim_gid, strerror(errno));
3993 }
3994 }
3995
3996 /* Handle a request to scan a file for malware */
3997 if (malware_test_file)
3998 {
3999 #ifdef WITH_CONTENT_SCAN
4000 int result;
4001 set_process_info("scanning file for malware");
4002 result = malware_in_file(malware_test_file);
4003 if (result == FAIL)
4004 {
4005 printf("No malware found.\n");
4006 exit(EXIT_SUCCESS);
4007 }
4008 if (result != OK)
4009 {
4010 printf("Malware lookup returned non-okay/fail: %d\n", result);
4011 exit(EXIT_FAILURE);
4012 }
4013 if (malware_name)
4014 printf("Malware found: %s\n", malware_name);
4015 else
4016 printf("Malware scan detected malware of unknown name.\n");
4017 #else
4018 printf("Malware scanning not enabled at compile time.\n");
4019 #endif
4020 exit(EXIT_FAILURE);
4021 }
4022
4023 /* Handle a request to list the delivery queue */
4024
4025 if (list_queue)
4026 {
4027 set_process_info("listing the queue");
4028 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4029 exit(EXIT_SUCCESS);
4030 }
4031
4032 /* Handle a request to count the delivery queue */
4033
4034 if (count_queue)
4035 {
4036 set_process_info("counting the queue");
4037 queue_count();
4038 exit(EXIT_SUCCESS);
4039 }
4040
4041 /* Handle actions on specific messages, except for the force delivery and
4042 message load actions, which are done below. Some actions take a whole list of
4043 message ids, which are known to continue up to the end of the arguments. Others
4044 take a single message id and then operate on the recipients list. */
4045
4046 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4047 {
4048 int yield = EXIT_SUCCESS;
4049 set_process_info("acting on specified messages");
4050
4051 if (!one_msg_action)
4052 {
4053 for (i = msg_action_arg; i < argc; i++)
4054 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4055 yield = EXIT_FAILURE;
4056 }
4057
4058 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4059 recipients_arg)) yield = EXIT_FAILURE;
4060 exit(yield);
4061 }
4062
4063 /* All the modes below here require the remaining configuration sections
4064 to be read, except that we can skip over the ACL setting when delivering
4065 specific messages, or doing a queue run. (For various testing cases we could
4066 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
4067 for skipping. */
4068
4069 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
4070
4071 /* The configuration data will have been read into POOL_PERM because we won't
4072 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4073 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4074 configuration were read into POOL_MAIN, because we don't do any resets till
4075 later on. However, it seems right, and it does ensure that both pools get used.
4076 */
4077
4078 store_pool = POOL_MAIN;
4079
4080 /* Handle the -brt option. This is for checking out retry configurations.
4081 The next three arguments are a domain name or a complete address, and
4082 optionally two error numbers. All it does is to call the function that
4083 scans the retry configuration data. */
4084
4085 if (test_retry_arg >= 0)
4086 {
4087 retry_config *yield;
4088 int basic_errno = 0;
4089 int more_errno = 0;
4090 uschar *s1, *s2;
4091
4092 if (test_retry_arg >= argc)
4093 {
4094 printf("-brt needs a domain or address argument\n");
4095 exim_exit(EXIT_FAILURE);
4096 }
4097 s1 = argv[test_retry_arg++];
4098 s2 = NULL;
4099
4100 /* If the first argument contains no @ and no . it might be a local user
4101 or it might be a single-component name. Treat as a domain. */
4102
4103 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4104 {
4105 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4106 "being \ntreated as a one-component domain, not as a local part.\n\n",
4107 s1);
4108 }
4109
4110 /* There may be an optional second domain arg. */
4111
4112 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4113 s2 = argv[test_retry_arg++];
4114
4115 /* The final arg is an error name */
4116
4117 if (test_retry_arg < argc)
4118 {
4119 uschar *ss = argv[test_retry_arg];
4120 uschar *error =
4121 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4122 if (error != NULL)
4123 {
4124 printf("%s\n", CS error);