670319b989db251032d98d02ae12564e4d25eff5
[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 #ifdef DB_VERSION_STRING
729 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
730 #elif defined(BTREEVERSION) && defined(HASHVERSION)
731 #ifdef USE_DB
732 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
733 #else
734 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
735 #endif
736 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
737 fprintf(f, "Probably ndbm\n");
738 #elif defined(USE_TDB)
739 fprintf(f, "Using tdb\n");
740 #else
741 #ifdef USE_GDBM
742 fprintf(f, "Probably GDBM (native mode)\n");
743 #else
744 fprintf(f, "Probably GDBM (compatibility mode)\n");
745 #endif
746 #endif
747
748 fprintf(f, "Support for:");
749 #ifdef SUPPORT_CRYPTEQ
750 fprintf(f, " crypteq");
751 #endif
752 #if HAVE_ICONV
753 fprintf(f, " iconv()");
754 #endif
755 #if HAVE_IPV6
756 fprintf(f, " IPv6");
757 #endif
758 #ifdef HAVE_SETCLASSRESOURCES
759 fprintf(f, " use_setclassresources");
760 #endif
761 #ifdef SUPPORT_PAM
762 fprintf(f, " PAM");
763 #endif
764 #ifdef EXIM_PERL
765 fprintf(f, " Perl");
766 #endif
767 #ifdef EXPAND_DLFUNC
768 fprintf(f, " Expand_dlfunc");
769 #endif
770 #ifdef USE_TCP_WRAPPERS
771 fprintf(f, " TCPwrappers");
772 #endif
773 #ifdef SUPPORT_TLS
774 #ifdef USE_GNUTLS
775 fprintf(f, " GnuTLS");
776 #else
777 fprintf(f, " OpenSSL");
778 #endif
779 #endif
780 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
781 fprintf(f, " translate_ip_address");
782 #endif
783 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
784 fprintf(f, " move_frozen_messages");
785 #endif
786 #ifdef WITH_CONTENT_SCAN
787 fprintf(f, " Content_Scanning");
788 #endif
789 #ifndef DISABLE_DKIM
790 fprintf(f, " DKIM");
791 #endif
792 #ifdef WITH_OLD_DEMIME
793 fprintf(f, " Old_Demime");
794 #endif
795 #ifdef EXPERIMENTAL_SPF
796 fprintf(f, " Experimental_SPF");
797 #endif
798 #ifdef EXPERIMENTAL_SRS
799 fprintf(f, " Experimental_SRS");
800 #endif
801 #ifdef EXPERIMENTAL_BRIGHTMAIL
802 fprintf(f, " Experimental_Brightmail");
803 #endif
804 #ifdef EXPERIMENTAL_DCC
805 fprintf(f, " Experimental_DCC");
806 #endif
807 fprintf(f, "\n");
808
809 fprintf(f, "Lookups (built-in):");
810 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
811 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
812 #endif
813 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
814 fprintf(f, " cdb");
815 #endif
816 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
817 fprintf(f, " dbm dbmnz");
818 #endif
819 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
820 fprintf(f, " dnsdb");
821 #endif
822 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
823 fprintf(f, " dsearch");
824 #endif
825 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
826 fprintf(f, " ibase");
827 #endif
828 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
829 fprintf(f, " ldap ldapdn ldapm");
830 #endif
831 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
832 fprintf(f, " mysql");
833 #endif
834 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
835 fprintf(f, " nis nis0");
836 #endif
837 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
838 fprintf(f, " nisplus");
839 #endif
840 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
841 fprintf(f, " oracle");
842 #endif
843 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
844 fprintf(f, " passwd");
845 #endif
846 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
847 fprintf(f, " pgsql");
848 #endif
849 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
850 fprintf(f, " sqlite");
851 #endif
852 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
853 fprintf(f, " testdb");
854 #endif
855 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
856 fprintf(f, " whoson");
857 #endif
858 fprintf(f, "\n");
859
860 fprintf(f, "Authenticators:");
861 #ifdef AUTH_CRAM_MD5
862 fprintf(f, " cram_md5");
863 #endif
864 #ifdef AUTH_CYRUS_SASL
865 fprintf(f, " cyrus_sasl");
866 #endif
867 #ifdef AUTH_DOVECOT
868 fprintf(f, " dovecot");
869 #endif
870 #ifdef AUTH_PLAINTEXT
871 fprintf(f, " plaintext");
872 #endif
873 #ifdef AUTH_SPA
874 fprintf(f, " spa");
875 #endif
876 fprintf(f, "\n");
877
878 fprintf(f, "Routers:");
879 #ifdef ROUTER_ACCEPT
880 fprintf(f, " accept");
881 #endif
882 #ifdef ROUTER_DNSLOOKUP
883 fprintf(f, " dnslookup");
884 #endif
885 #ifdef ROUTER_IPLITERAL
886 fprintf(f, " ipliteral");
887 #endif
888 #ifdef ROUTER_IPLOOKUP
889 fprintf(f, " iplookup");
890 #endif
891 #ifdef ROUTER_MANUALROUTE
892 fprintf(f, " manualroute");
893 #endif
894 #ifdef ROUTER_QUERYPROGRAM
895 fprintf(f, " queryprogram");
896 #endif
897 #ifdef ROUTER_REDIRECT
898 fprintf(f, " redirect");
899 #endif
900 fprintf(f, "\n");
901
902 fprintf(f, "Transports:");
903 #ifdef TRANSPORT_APPENDFILE
904 fprintf(f, " appendfile");
905 #ifdef SUPPORT_MAILDIR
906 fprintf(f, "/maildir");
907 #endif
908 #ifdef SUPPORT_MAILSTORE
909 fprintf(f, "/mailstore");
910 #endif
911 #ifdef SUPPORT_MBX
912 fprintf(f, "/mbx");
913 #endif
914 #endif
915 #ifdef TRANSPORT_AUTOREPLY
916 fprintf(f, " autoreply");
917 #endif
918 #ifdef TRANSPORT_LMTP
919 fprintf(f, " lmtp");
920 #endif
921 #ifdef TRANSPORT_PIPE
922 fprintf(f, " pipe");
923 #endif
924 #ifdef TRANSPORT_SMTP
925 fprintf(f, " smtp");
926 #endif
927 fprintf(f, "\n");
928
929 if (fixed_never_users[0] > 0)
930 {
931 int i;
932 fprintf(f, "Fixed never_users: ");
933 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
934 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
935 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
936 }
937
938 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
939
940 /* Everything else is details which are only worth reporting when debugging.
941 Perhaps the tls_version_report should move into this too. */
942 DEBUG(D_any) do {
943
944 int i;
945
946 /* clang defines __GNUC__ (at least, for me) so test for it first */
947 #if defined(__clang__)
948 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
949 #elif defined(__GNUC__)
950 fprintf(f, "Compiler: GCC [%s]\n",
951 # ifdef __VERSION__
952 __VERSION__
953 # else
954 "? unknown version ?"
955 # endif
956 );
957 #else
958 fprintf(f, "Compiler: <unknown>\n");
959 #endif
960
961 #ifdef SUPPORT_TLS
962 tls_version_report(f);
963 #endif
964
965 #ifdef AUTH_CYRUS_SASL
966 auth_cyrus_sasl_version_report(f);
967 #endif
968
969 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
970 " Runtime: %s\n",
971 PCRE_MAJOR, PCRE_MINOR,
972 /* PRE_PRERELEASE is either defined and empty or a string.
973 * unless its an ancient version of PCRE in which case it
974 * is not defined */
975 #ifdef PCRE_PRERELEASE
976 PCRE_PRERELEASE "",
977 #else
978 "",
979 #endif
980 pcre_version());
981
982 init_lookup_list();
983 for (i = 0; i < lookup_list_count; i++)
984 {
985 if (lookup_list[i]->version_report)
986 lookup_list[i]->version_report(f);
987 }
988
989 #ifdef WHITELIST_D_MACROS
990 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
991 #else
992 fprintf(f, "WHITELIST_D_MACROS unset\n");
993 #endif
994 #ifdef TRUSTED_CONFIG_LIST
995 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
996 #else
997 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
998 #endif
999
1000 } while (0);
1001 }
1002
1003
1004
1005
1006 /*************************************************
1007 * Quote a local part *
1008 *************************************************/
1009
1010 /* This function is used when a sender address or a From: or Sender: header
1011 line is being created from the caller's login, or from an authenticated_id. It
1012 applies appropriate quoting rules for a local part.
1013
1014 Argument: the local part
1015 Returns: the local part, quoted if necessary
1016 */
1017
1018 uschar *
1019 local_part_quote(uschar *lpart)
1020 {
1021 BOOL needs_quote = FALSE;
1022 int size, ptr;
1023 uschar *yield;
1024 uschar *t;
1025
1026 for (t = lpart; !needs_quote && *t != 0; t++)
1027 {
1028 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1029 (*t != '.' || t == lpart || t[1] == 0);
1030 }
1031
1032 if (!needs_quote) return lpart;
1033
1034 size = ptr = 0;
1035 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1036
1037 for (;;)
1038 {
1039 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1040 if (nq == NULL)
1041 {
1042 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1043 break;
1044 }
1045 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1046 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1047 yield = string_cat(yield, &size, &ptr, nq, 1);
1048 lpart = nq + 1;
1049 }
1050
1051 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1052 yield[ptr] = 0;
1053 return yield;
1054 }
1055
1056
1057
1058 #ifdef USE_READLINE
1059 /*************************************************
1060 * Load readline() functions *
1061 *************************************************/
1062
1063 /* This function is called from testing executions that read data from stdin,
1064 but only when running as the calling user. Currently, only -be does this. The
1065 function loads the readline() function library and passes back the functions.
1066 On some systems, it needs the curses library, so load that too, but try without
1067 it if loading fails. All this functionality has to be requested at build time.
1068
1069 Arguments:
1070 fn_readline_ptr pointer to where to put the readline pointer
1071 fn_addhist_ptr pointer to where to put the addhistory function
1072
1073 Returns: the dlopen handle or NULL on failure
1074 */
1075
1076 static void *
1077 set_readline(char * (**fn_readline_ptr)(const char *),
1078 void (**fn_addhist_ptr)(const char *))
1079 {
1080 void *dlhandle;
1081 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1082
1083 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1084 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1085
1086 if (dlhandle != NULL)
1087 {
1088 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1089 * char * readline (const char *prompt);
1090 * void add_history (const char *string);
1091 */
1092 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1093 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1094 }
1095 else
1096 {
1097 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1098 }
1099
1100 return dlhandle;
1101 }
1102 #endif
1103
1104
1105
1106 /*************************************************
1107 * Get a line from stdin for testing things *
1108 *************************************************/
1109
1110 /* This function is called when running tests that can take a number of lines
1111 of input (for example, -be and -bt). It handles continuations and trailing
1112 spaces. And prompting and a blank line output on eof. If readline() is in use,
1113 the arguments are non-NULL and provide the relevant functions.
1114
1115 Arguments:
1116 fn_readline readline function or NULL
1117 fn_addhist addhist function or NULL
1118
1119 Returns: pointer to dynamic memory, or NULL at end of file
1120 */
1121
1122 static uschar *
1123 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1124 {
1125 int i;
1126 int size = 0;
1127 int ptr = 0;
1128 uschar *yield = NULL;
1129
1130 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1131
1132 for (i = 0;; i++)
1133 {
1134 uschar buffer[1024];
1135 uschar *p, *ss;
1136
1137 #ifdef USE_READLINE
1138 char *readline_line = NULL;
1139 if (fn_readline != NULL)
1140 {
1141 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1142 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1143 p = US readline_line;
1144 }
1145 else
1146 #endif
1147
1148 /* readline() not in use */
1149
1150 {
1151 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1152 p = buffer;
1153 }
1154
1155 /* Handle the line */
1156
1157 ss = p + (int)Ustrlen(p);
1158 while (ss > p && isspace(ss[-1])) ss--;
1159
1160 if (i > 0)
1161 {
1162 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1163 }
1164
1165 yield = string_cat(yield, &size, &ptr, p, ss - p);
1166
1167 #ifdef USE_READLINE
1168 if (fn_readline != NULL) free(readline_line);
1169 #endif
1170
1171 if (ss == p || yield[ptr-1] != '\\')
1172 {
1173 yield[ptr] = 0;
1174 break;
1175 }
1176 yield[--ptr] = 0;
1177 }
1178
1179 if (yield == NULL) printf("\n");
1180 return yield;
1181 }
1182
1183
1184
1185 /*************************************************
1186 * Output usage information for the program *
1187 *************************************************/
1188
1189 /* This function is called when there are no recipients
1190 or a specific --help argument was added.
1191
1192 Arguments:
1193 progname information on what name we were called by
1194
1195 Returns: DOES NOT RETURN
1196 */
1197
1198 static void
1199 exim_usage(uschar *progname)
1200 {
1201
1202 /* Handle specific program invocation varients */
1203 if (Ustrcmp(progname, US"-mailq") == 0)
1204 {
1205 fprintf(stderr,
1206 "mailq - list the contents of the mail queue\n\n"
1207 "For a list of options, see the Exim documentation.\n");
1208 exit(EXIT_FAILURE);
1209 }
1210
1211 /* Generic usage - we output this whatever happens */
1212 fprintf(stderr,
1213 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1214 "not directly from a shell command line. Options and/or arguments control\n"
1215 "what it does when called. For a list of options, see the Exim documentation.\n");
1216
1217 exit(EXIT_FAILURE);
1218 }
1219
1220
1221
1222 /*************************************************
1223 * Validate that the macros given are okay *
1224 *************************************************/
1225
1226 /* Typically, Exim will drop privileges if macros are supplied. In some
1227 cases, we want to not do so.
1228
1229 Arguments: none (macros is a global)
1230 Returns: true if trusted, false otherwise
1231 */
1232
1233 static BOOL
1234 macros_trusted(void)
1235 {
1236 #ifdef WHITELIST_D_MACROS
1237 macro_item *m;
1238 uschar *whitelisted, *end, *p, **whites, **w;
1239 int white_count, i, n;
1240 size_t len;
1241 BOOL prev_char_item, found;
1242 #endif
1243
1244 if (macros == NULL)
1245 return TRUE;
1246 #ifndef WHITELIST_D_MACROS
1247 return FALSE;
1248 #else
1249
1250 /* We only trust -D overrides for some invoking users:
1251 root, the exim run-time user, the optional config owner user.
1252 I don't know why config-owner would be needed, but since they can own the
1253 config files anyway, there's no security risk to letting them override -D. */
1254 if ( ! ((real_uid == root_uid)
1255 || (real_uid == exim_uid)
1256 #ifdef CONFIGURE_OWNER
1257 || (real_uid == config_uid)
1258 #endif
1259 ))
1260 {
1261 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1262 return FALSE;
1263 }
1264
1265 /* Get a list of macros which are whitelisted */
1266 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1267 prev_char_item = FALSE;
1268 white_count = 0;
1269 for (p = whitelisted; *p != '\0'; ++p)
1270 {
1271 if (*p == ':' || isspace(*p))
1272 {
1273 *p = '\0';
1274 if (prev_char_item)
1275 ++white_count;
1276 prev_char_item = FALSE;
1277 continue;
1278 }
1279 if (!prev_char_item)
1280 prev_char_item = TRUE;
1281 }
1282 end = p;
1283 if (prev_char_item)
1284 ++white_count;
1285 if (!white_count)
1286 return FALSE;
1287 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1288 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1289 {
1290 if (*p != '\0')
1291 {
1292 whites[i++] = p;
1293 if (i == white_count)
1294 break;
1295 while (*p != '\0' && p < end)
1296 ++p;
1297 }
1298 }
1299 whites[i] = NULL;
1300
1301 /* The list of macros should be very short. Accept the N*M complexity. */
1302 for (m = macros; m != NULL; m = m->next)
1303 {
1304 found = FALSE;
1305 for (w = whites; *w; ++w)
1306 if (Ustrcmp(*w, m->name) == 0)
1307 {
1308 found = TRUE;
1309 break;
1310 }
1311 if (!found)
1312 return FALSE;
1313 if (m->replacement == NULL)
1314 continue;
1315 len = Ustrlen(m->replacement);
1316 if (len == 0)
1317 continue;
1318 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1319 0, PCRE_EOPT, NULL, 0);
1320 if (n < 0)
1321 {
1322 if (n != PCRE_ERROR_NOMATCH)
1323 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1324 return FALSE;
1325 }
1326 }
1327 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1328 return TRUE;
1329 #endif
1330 }
1331
1332
1333 /*************************************************
1334 * Entry point and high-level code *
1335 *************************************************/
1336
1337 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1338 the appropriate action. All the necessary functions are present in the one
1339 binary. I originally thought one should split it up, but it turns out that so
1340 much of the apparatus is needed in each chunk that one might as well just have
1341 it all available all the time, which then makes the coding easier as well.
1342
1343 Arguments:
1344 argc count of entries in argv
1345 argv argument strings, with argv[0] being the program name
1346
1347 Returns: EXIT_SUCCESS if terminated successfully
1348 EXIT_FAILURE otherwise, except when a message has been sent
1349 to the sender, and -oee was given
1350 */
1351
1352 int
1353 main(int argc, char **cargv)
1354 {
1355 uschar **argv = USS cargv;
1356 int arg_receive_timeout = -1;
1357 int arg_smtp_receive_timeout = -1;
1358 int arg_error_handling = error_handling;
1359 int filter_sfd = -1;
1360 int filter_ufd = -1;
1361 int group_count;
1362 int i, rv;
1363 int list_queue_option = 0;
1364 int msg_action = 0;
1365 int msg_action_arg = -1;
1366 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1367 int queue_only_reason = 0;
1368 #ifdef EXIM_PERL
1369 int perl_start_option = 0;
1370 #endif
1371 int recipients_arg = argc;
1372 int sender_address_domain = 0;
1373 int test_retry_arg = -1;
1374 int test_rewrite_arg = -1;
1375 BOOL arg_queue_only = FALSE;
1376 BOOL bi_option = FALSE;
1377 BOOL checking = FALSE;
1378 BOOL count_queue = FALSE;
1379 BOOL expansion_test = FALSE;
1380 BOOL extract_recipients = FALSE;
1381 BOOL forced_delivery = FALSE;
1382 BOOL f_end_dot = FALSE;
1383 BOOL deliver_give_up = FALSE;
1384 BOOL list_queue = FALSE;
1385 BOOL list_options = FALSE;
1386 BOOL local_queue_only;
1387 BOOL more = TRUE;
1388 BOOL one_msg_action = FALSE;
1389 BOOL queue_only_set = FALSE;
1390 BOOL receiving_message = TRUE;
1391 BOOL sender_ident_set = FALSE;
1392 BOOL session_local_queue_only;
1393 BOOL unprivileged;
1394 BOOL removed_privilege = FALSE;
1395 BOOL usage_wanted = FALSE;
1396 BOOL verify_address_mode = FALSE;
1397 BOOL verify_as_sender = FALSE;
1398 BOOL version_printed = FALSE;
1399 uschar *alias_arg = NULL;
1400 uschar *called_as = US"";
1401 uschar *start_queue_run_id = NULL;
1402 uschar *stop_queue_run_id = NULL;
1403 uschar *expansion_test_message = NULL;
1404 uschar *ftest_domain = NULL;
1405 uschar *ftest_localpart = NULL;
1406 uschar *ftest_prefix = NULL;
1407 uschar *ftest_suffix = NULL;
1408 uschar *malware_test_file = NULL;
1409 uschar *real_sender_address;
1410 uschar *originator_home = US"/";
1411 void *reset_point;
1412
1413 struct passwd *pw;
1414 struct stat statbuf;
1415 pid_t passed_qr_pid = (pid_t)0;
1416 int passed_qr_pipe = -1;
1417 gid_t group_list[NGROUPS_MAX];
1418
1419 /* Possible options for -R and -S */
1420
1421 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1422
1423 /* Need to define this in case we need to change the environment in order
1424 to get rid of a bogus time zone. We have to make it char rather than uschar
1425 because some OS define it in /usr/include/unistd.h. */
1426
1427 extern char **environ;
1428
1429 /* If the Exim user and/or group and/or the configuration file owner/group were
1430 defined by ref:name at build time, we must now find the actual uid/gid values.
1431 This is a feature to make the lives of binary distributors easier. */
1432
1433 #ifdef EXIM_USERNAME
1434 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1435 {
1436 if (exim_uid == 0)
1437 {
1438 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1439 EXIM_USERNAME);
1440 exit(EXIT_FAILURE);
1441 }
1442 /* If ref:name uses a number as the name, route_finduser() returns
1443 TRUE with exim_uid set and pw coerced to NULL. */
1444 if (pw)
1445 exim_gid = pw->pw_gid;
1446 #ifndef EXIM_GROUPNAME
1447 else
1448 {
1449 fprintf(stderr,
1450 "exim: ref:name should specify a usercode, not a group.\n"
1451 "exim: can't let you get away with it unless you also specify a group.\n");
1452 exit(EXIT_FAILURE);
1453 }
1454 #endif
1455 }
1456 else
1457 {
1458 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1459 EXIM_USERNAME);
1460 exit(EXIT_FAILURE);
1461 }
1462 #endif
1463
1464 #ifdef EXIM_GROUPNAME
1465 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1466 {
1467 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1468 EXIM_GROUPNAME);
1469 exit(EXIT_FAILURE);
1470 }
1471 #endif
1472
1473 #ifdef CONFIGURE_OWNERNAME
1474 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1475 {
1476 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1477 CONFIGURE_OWNERNAME);
1478 exit(EXIT_FAILURE);
1479 }
1480 #endif
1481
1482 /* We default the system_filter_user to be the Exim run-time user, as a
1483 sane non-root value. */
1484 system_filter_uid = exim_uid;
1485
1486 #ifdef CONFIGURE_GROUPNAME
1487 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1488 {
1489 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1490 CONFIGURE_GROUPNAME);
1491 exit(EXIT_FAILURE);
1492 }
1493 #endif
1494
1495 /* In the Cygwin environment, some initialization needs doing. It is fudged
1496 in by means of this macro. */
1497
1498 #ifdef OS_INIT
1499 OS_INIT
1500 #endif
1501
1502 /* Check a field which is patched when we are running Exim within its
1503 testing harness; do a fast initial check, and then the whole thing. */
1504
1505 running_in_test_harness =
1506 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1507
1508 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1509 at the start of a program; however, it seems that some environments do not
1510 follow this. A "strange" locale can affect the formatting of timestamps, so we
1511 make quite sure. */
1512
1513 setlocale(LC_ALL, "C");
1514
1515 /* Set up the default handler for timing using alarm(). */
1516
1517 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1518
1519 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1520 because store_malloc writes a log entry on failure. */
1521
1522 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1523 if (log_buffer == NULL)
1524 {
1525 fprintf(stderr, "exim: failed to get store for log buffer\n");
1526 exit(EXIT_FAILURE);
1527 }
1528
1529 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1530 NULL when the daemon is run and the file is closed. We have to use this
1531 indirection, because some systems don't allow writing to the variable "stderr".
1532 */
1533
1534 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1535
1536 /* Arrange for the PCRE regex library to use our store functions. Note that
1537 the normal calls are actually macros that add additional arguments for
1538 debugging purposes so we have to assign specially constructed functions here.
1539 The default is to use store in the stacking pool, but this is overridden in the
1540 regex_must_compile() function. */
1541
1542 pcre_malloc = function_store_get;
1543 pcre_free = function_dummy_free;
1544
1545 /* Ensure there is a big buffer for temporary use in several places. It is put
1546 in malloc store so that it can be freed for enlargement if necessary. */
1547
1548 big_buffer = store_malloc(big_buffer_size);
1549
1550 /* Set up the handler for the data request signal, and set the initial
1551 descriptive text. */
1552
1553 set_process_info("initializing");
1554 os_restarting_signal(SIGUSR1, usr1_handler);
1555
1556 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1557 in the daemon code. For the rest of Exim's uses, we ignore it. */
1558
1559 signal(SIGHUP, SIG_IGN);
1560
1561 /* We don't want to die on pipe errors as the code is written to handle
1562 the write error instead. */
1563
1564 signal(SIGPIPE, SIG_IGN);
1565
1566 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1567 set to SIG_IGN. This causes subprocesses that complete before the parent
1568 process waits for them not to hang around, so when Exim calls wait(), nothing
1569 is there. The wait() code has been made robust against this, but let's ensure
1570 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1571 ending status. We use sigaction rather than plain signal() on those OS where
1572 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1573 problem on AIX with this.) */
1574
1575 #ifdef SA_NOCLDWAIT
1576 {
1577 struct sigaction act;
1578 act.sa_handler = SIG_DFL;
1579 sigemptyset(&(act.sa_mask));
1580 act.sa_flags = 0;
1581 sigaction(SIGCHLD, &act, NULL);
1582 }
1583 #else
1584 signal(SIGCHLD, SIG_DFL);
1585 #endif
1586
1587 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1588 SIGHUP. */
1589
1590 sighup_argv = argv;
1591
1592 /* Set up the version number. Set up the leading 'E' for the external form of
1593 message ids, set the pointer to the internal form, and initialize it to
1594 indicate no message being processed. */
1595
1596 version_init();
1597 message_id_option[0] = '-';
1598 message_id_external = message_id_option + 1;
1599 message_id_external[0] = 'E';
1600 message_id = message_id_external + 1;
1601 message_id[0] = 0;
1602
1603 /* Set the umask to zero so that any files Exim creates using open() are
1604 created with the modes that it specifies. NOTE: Files created with fopen() have
1605 a problem, which was not recognized till rather late (February 2006). With this
1606 umask, such files will be world writeable. (They are all content scanning files
1607 in the spool directory, which isn't world-accessible, so this is not a
1608 disaster, but it's untidy.) I don't want to change this overall setting,
1609 however, because it will interact badly with the open() calls. Instead, there's
1610 now a function called modefopen() that fiddles with the umask while calling
1611 fopen(). */
1612
1613 (void)umask(0);
1614
1615 /* Precompile the regular expression for matching a message id. Keep this in
1616 step with the code that generates ids in the accept.c module. We need to do
1617 this here, because the -M options check their arguments for syntactic validity
1618 using mac_ismsgid, which uses this. */
1619
1620 regex_ismsgid =
1621 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1622
1623 /* Precompile the regular expression that is used for matching an SMTP error
1624 code, possibly extended, at the start of an error message. Note that the
1625 terminating whitespace character is included. */
1626
1627 regex_smtp_code =
1628 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1629 FALSE, TRUE);
1630
1631 #ifdef WHITELIST_D_MACROS
1632 /* Precompile the regular expression used to filter the content of macros
1633 given to -D for permissibility. */
1634
1635 regex_whitelisted_macro =
1636 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1637 #endif
1638
1639
1640 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1641 this seems to be a generally accepted convention, since one finds symbolic
1642 links called "mailq" in standard OS configurations. */
1643
1644 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1645 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1646 {
1647 list_queue = TRUE;
1648 receiving_message = FALSE;
1649 called_as = US"-mailq";
1650 }
1651
1652 /* If the program is called as "rmail" treat it as equivalent to
1653 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1654 i.e. preventing a single dot on a line from terminating the message, and
1655 returning with zero return code, even in cases of error (provided an error
1656 message has been sent). */
1657
1658 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1659 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1660 {
1661 dot_ends = FALSE;
1662 called_as = US"-rmail";
1663 errors_sender_rc = EXIT_SUCCESS;
1664 }
1665
1666 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1667 this is a smail convention. */
1668
1669 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1670 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1671 {
1672 smtp_input = smtp_batched_input = TRUE;
1673 called_as = US"-rsmtp";
1674 }
1675
1676 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1677 this is a smail convention. */
1678
1679 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1680 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1681 {
1682 queue_interval = 0;
1683 receiving_message = FALSE;
1684 called_as = US"-runq";
1685 }
1686
1687 /* If the program is called as "newaliases" treat it as equivalent to
1688 "exim -bi"; this is a sendmail convention. */
1689
1690 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1691 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1692 {
1693 bi_option = TRUE;
1694 receiving_message = FALSE;
1695 called_as = US"-newaliases";
1696 }
1697
1698 /* Save the original effective uid for a couple of uses later. It should
1699 normally be root, but in some esoteric environments it may not be. */
1700
1701 original_euid = geteuid();
1702
1703 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1704 to be the same as the real ones. This makes a difference only if Exim is setuid
1705 (or setgid) to something other than root, which could be the case in some
1706 special configurations. */
1707
1708 real_uid = getuid();
1709 real_gid = getgid();
1710
1711 if (real_uid == root_uid)
1712 {
1713 rv = setgid(real_gid);
1714 if (rv)
1715 {
1716 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1717 (long int)real_gid, strerror(errno));
1718 exit(EXIT_FAILURE);
1719 }
1720 rv = setuid(real_uid);
1721 if (rv)
1722 {
1723 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1724 (long int)real_uid, strerror(errno));
1725 exit(EXIT_FAILURE);
1726 }
1727 }
1728
1729 /* If neither the original real uid nor the original euid was root, Exim is
1730 running in an unprivileged state. */
1731
1732 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1733
1734 /* Scan the program's arguments. Some can be dealt with right away; others are
1735 simply recorded for checking and handling afterwards. Do a high-level switch
1736 on the second character (the one after '-'), to save some effort. */
1737
1738 for (i = 1; i < argc; i++)
1739 {
1740 BOOL badarg = FALSE;
1741 uschar *arg = argv[i];
1742 uschar *argrest;
1743 int switchchar;
1744
1745 /* An argument not starting with '-' is the start of a recipients list;
1746 break out of the options-scanning loop. */
1747
1748 if (arg[0] != '-')
1749 {
1750 recipients_arg = i;
1751 break;
1752 }
1753
1754 /* An option consistion of -- terminates the options */
1755
1756 if (Ustrcmp(arg, "--") == 0)
1757 {
1758 recipients_arg = i + 1;
1759 break;
1760 }
1761
1762 /* Handle flagged options */
1763
1764 switchchar = arg[1];
1765 argrest = arg+2;
1766
1767 /* Make all -ex options synonymous with -oex arguments, since that
1768 is assumed by various callers. Also make -qR options synonymous with -R
1769 options, as that seems to be required as well. Allow for -qqR too, and
1770 the same for -S options. */
1771
1772 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1773 Ustrncmp(arg+1, "qR", 2) == 0 ||
1774 Ustrncmp(arg+1, "qS", 2) == 0)
1775 {
1776 switchchar = arg[2];
1777 argrest++;
1778 }
1779 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1780 {
1781 switchchar = arg[3];
1782 argrest += 2;
1783 queue_2stage = TRUE;
1784 }
1785
1786 /* Make -r synonymous with -f, since it is a documented alias */
1787
1788 else if (arg[1] == 'r') switchchar = 'f';
1789
1790 /* Make -ov synonymous with -v */
1791
1792 else if (Ustrcmp(arg, "-ov") == 0)
1793 {
1794 switchchar = 'v';
1795 argrest++;
1796 }
1797
1798 /* deal with --option_aliases */
1799 else if (switchchar == '-')
1800 {
1801 if (Ustrcmp(argrest, "help") == 0)
1802 {
1803 usage_wanted = TRUE;
1804 break;
1805 }
1806 else if (Ustrcmp(argrest, "version") == 0)
1807 {
1808 switchchar = 'b';
1809 argrest = US"V";
1810 }
1811 }
1812
1813 /* High-level switch on active initial letter */
1814
1815 switch(switchchar)
1816 {
1817 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1818 so has no need of it. */
1819
1820 case 'B':
1821 if (*argrest == 0) i++; /* Skip over the type */
1822 break;
1823
1824
1825 case 'b':
1826 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1827
1828 /* -bd: Run in daemon mode, awaiting SMTP connections.
1829 -bdf: Ditto, but in the foreground.
1830 */
1831
1832 if (*argrest == 'd')
1833 {
1834 daemon_listen = TRUE;
1835 if (*(++argrest) == 'f') background_daemon = FALSE;
1836 else if (*argrest != 0) { badarg = TRUE; break; }
1837 }
1838
1839 /* -be: Run in expansion test mode
1840 -bem: Ditto, but read a message from a file first
1841 */
1842
1843 else if (*argrest == 'e')
1844 {
1845 expansion_test = checking = TRUE;
1846 if (argrest[1] == 'm')
1847 {
1848 if (++i >= argc) { badarg = TRUE; break; }
1849 expansion_test_message = argv[i];
1850 argrest++;
1851 }
1852 if (argrest[1] != 0) { badarg = TRUE; break; }
1853 }
1854
1855 /* -bF: Run system filter test */
1856
1857 else if (*argrest == 'F')
1858 {
1859 filter_test |= FTEST_SYSTEM;
1860 if (*(++argrest) != 0) { badarg = TRUE; break; }
1861 if (++i < argc) filter_test_sfile = argv[i]; else
1862 {
1863 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1864 exit(EXIT_FAILURE);
1865 }
1866 }
1867
1868 /* -bf: Run user filter test
1869 -bfd: Set domain for filter testing
1870 -bfl: Set local part for filter testing
1871 -bfp: Set prefix for filter testing
1872 -bfs: Set suffix for filter testing
1873 */
1874
1875 else if (*argrest == 'f')
1876 {
1877 if (*(++argrest) == 0)
1878 {
1879 filter_test |= FTEST_USER;
1880 if (++i < argc) filter_test_ufile = argv[i]; else
1881 {
1882 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1883 exit(EXIT_FAILURE);
1884 }
1885 }
1886 else
1887 {
1888 if (++i >= argc)
1889 {
1890 fprintf(stderr, "exim: string expected after %s\n", arg);
1891 exit(EXIT_FAILURE);
1892 }
1893 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1894 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1895 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1896 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1897 else { badarg = TRUE; break; }
1898 }
1899 }
1900
1901 /* -bh: Host checking - an IP address must follow. */
1902
1903 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1904 {
1905 if (++i >= argc) { badarg = TRUE; break; }
1906 sender_host_address = argv[i];
1907 host_checking = checking = log_testing_mode = TRUE;
1908 host_checking_callout = argrest[1] == 'c';
1909 }
1910
1911 /* -bi: This option is used by sendmail to initialize *the* alias file,
1912 though it has the -oA option to specify a different file. Exim has no
1913 concept of *the* alias file, but since Sun's YP make script calls
1914 sendmail this way, some support must be provided. */
1915
1916 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1917
1918 /* -bm: Accept and deliver message - the default option. Reinstate
1919 receiving_message, which got turned off for all -b options. */
1920
1921 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1922
1923 /* -bmalware: test the filename given for malware */
1924
1925 else if (Ustrcmp(argrest, "malware") == 0)
1926 {
1927 if (++i >= argc) { badarg = TRUE; break; }
1928 malware_test_file = argv[i];
1929 }
1930
1931 /* -bnq: For locally originating messages, do not qualify unqualified
1932 addresses. In the envelope, this causes errors; in header lines they
1933 just get left. */
1934
1935 else if (Ustrcmp(argrest, "nq") == 0)
1936 {
1937 allow_unqualified_sender = FALSE;
1938 allow_unqualified_recipient = FALSE;
1939 }
1940
1941 /* -bpxx: List the contents of the mail queue, in various forms. If
1942 the option is -bpc, just a queue count is needed. Otherwise, if the
1943 first letter after p is r, then order is random. */
1944
1945 else if (*argrest == 'p')
1946 {
1947 if (*(++argrest) == 'c')
1948 {
1949 count_queue = TRUE;
1950 if (*(++argrest) != 0) badarg = TRUE;
1951 break;
1952 }
1953
1954 if (*argrest == 'r')
1955 {
1956 list_queue_option = 8;
1957 argrest++;
1958 }
1959 else list_queue_option = 0;
1960
1961 list_queue = TRUE;
1962
1963 /* -bp: List the contents of the mail queue, top-level only */
1964
1965 if (*argrest == 0) {}
1966
1967 /* -bpu: List the contents of the mail queue, top-level undelivered */
1968
1969 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1970
1971 /* -bpa: List the contents of the mail queue, including all delivered */
1972
1973 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1974
1975 /* Unknown after -bp[r] */
1976
1977 else
1978 {
1979 badarg = TRUE;
1980 break;
1981 }
1982 }
1983
1984
1985 /* -bP: List the configuration variables given as the address list.
1986 Force -v, so configuration errors get displayed. */
1987
1988 else if (Ustrcmp(argrest, "P") == 0)
1989 {
1990 list_options = TRUE;
1991 debug_selector |= D_v;
1992 debug_file = stderr;
1993 }
1994
1995 /* -brt: Test retry configuration lookup */
1996
1997 else if (Ustrcmp(argrest, "rt") == 0)
1998 {
1999 test_retry_arg = i + 1;
2000 goto END_ARG;
2001 }
2002
2003 /* -brw: Test rewrite configuration */
2004
2005 else if (Ustrcmp(argrest, "rw") == 0)
2006 {
2007 test_rewrite_arg = i + 1;
2008 goto END_ARG;
2009 }
2010
2011 /* -bS: Read SMTP commands on standard input, but produce no replies -
2012 all errors are reported by sending messages. */
2013
2014 else if (Ustrcmp(argrest, "S") == 0)
2015 smtp_input = smtp_batched_input = receiving_message = TRUE;
2016
2017 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2018 on standard output. */
2019
2020 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2021
2022 /* -bt: address testing mode */
2023
2024 else if (Ustrcmp(argrest, "t") == 0)
2025 address_test_mode = checking = log_testing_mode = TRUE;
2026
2027 /* -bv: verify addresses */
2028
2029 else if (Ustrcmp(argrest, "v") == 0)
2030 verify_address_mode = checking = log_testing_mode = TRUE;
2031
2032 /* -bvs: verify sender addresses */
2033
2034 else if (Ustrcmp(argrest, "vs") == 0)
2035 {
2036 verify_address_mode = checking = log_testing_mode = TRUE;
2037 verify_as_sender = TRUE;
2038 }
2039
2040 /* -bV: Print version string and support details */
2041
2042 else if (Ustrcmp(argrest, "V") == 0)
2043 {
2044 printf("Exim version %s #%s built %s\n", version_string,
2045 version_cnumber, version_date);
2046 printf("%s\n", CS version_copyright);
2047 version_printed = TRUE;
2048 show_whats_supported(stdout);
2049 }
2050
2051 else badarg = TRUE;
2052 break;
2053
2054
2055 /* -C: change configuration file list; ignore if it isn't really
2056 a change! Enforce a prefix check if required. */
2057
2058 case 'C':
2059 if (*argrest == 0)
2060 {
2061 if(++i < argc) argrest = argv[i]; else
2062 { badarg = TRUE; break; }
2063 }
2064 if (Ustrcmp(config_main_filelist, argrest) != 0)
2065 {
2066 #ifdef ALT_CONFIG_PREFIX
2067 int sep = 0;
2068 int len = Ustrlen(ALT_CONFIG_PREFIX);
2069 uschar *list = argrest;
2070 uschar *filename;
2071 while((filename = string_nextinlist(&list, &sep, big_buffer,
2072 big_buffer_size)) != NULL)
2073 {
2074 if ((Ustrlen(filename) < len ||
2075 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2076 Ustrstr(filename, "/../") != NULL) &&
2077 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2078 {
2079 fprintf(stderr, "-C Permission denied\n");
2080 exit(EXIT_FAILURE);
2081 }
2082 }
2083 #endif
2084 if (real_uid != root_uid)
2085 {
2086 #ifdef TRUSTED_CONFIG_LIST
2087
2088 if (real_uid != exim_uid
2089 #ifdef CONFIGURE_OWNER
2090 && real_uid != config_uid
2091 #endif
2092 )
2093 trusted_config = FALSE;
2094 else
2095 {
2096 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2097 if (trust_list)
2098 {
2099 struct stat statbuf;
2100
2101 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2102 (statbuf.st_uid != root_uid /* owner not root */
2103 #ifdef CONFIGURE_OWNER
2104 && statbuf.st_uid != config_uid /* owner not the special one */
2105 #endif
2106 ) || /* or */
2107 (statbuf.st_gid != root_gid /* group not root */
2108 #ifdef CONFIGURE_GROUP
2109 && statbuf.st_gid != config_gid /* group not the special one */
2110 #endif
2111 && (statbuf.st_mode & 020) != 0 /* group writeable */
2112 ) || /* or */
2113 (statbuf.st_mode & 2) != 0) /* world writeable */
2114 {
2115 trusted_config = FALSE;
2116 fclose(trust_list);
2117 }
2118 else
2119 {
2120 /* Well, the trust list at least is up to scratch... */
2121 void *reset_point = store_get(0);
2122 uschar *trusted_configs[32];
2123 int nr_configs = 0;
2124 int i = 0;
2125
2126 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2127 {
2128 uschar *start = big_buffer, *nl;
2129 while (*start && isspace(*start))
2130 start++;
2131 if (*start != '/')
2132 continue;
2133 nl = Ustrchr(start, '\n');
2134 if (nl)
2135 *nl = 0;
2136 trusted_configs[nr_configs++] = string_copy(start);
2137 if (nr_configs == 32)
2138 break;
2139 }
2140 fclose(trust_list);
2141
2142 if (nr_configs)
2143 {
2144 int sep = 0;
2145 uschar *list = argrest;
2146 uschar *filename;
2147 while (trusted_config && (filename = string_nextinlist(&list,
2148 &sep, big_buffer, big_buffer_size)) != NULL)
2149 {
2150 for (i=0; i < nr_configs; i++)
2151 {
2152 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2153 break;
2154 }
2155 if (i == nr_configs)
2156 {
2157 trusted_config = FALSE;
2158 break;
2159 }
2160 }
2161 store_reset(reset_point);
2162 }
2163 else
2164 {
2165 /* No valid prefixes found in trust_list file. */
2166 trusted_config = FALSE;
2167 }
2168 }
2169 }
2170 else
2171 {
2172 /* Could not open trust_list file. */
2173 trusted_config = FALSE;
2174 }
2175 }
2176 #else
2177 /* Not root; don't trust config */
2178 trusted_config = FALSE;
2179 #endif
2180 }
2181
2182 config_main_filelist = argrest;
2183 config_changed = TRUE;
2184 }
2185 break;
2186
2187
2188 /* -D: set up a macro definition */
2189
2190 case 'D':
2191 #ifdef DISABLE_D_OPTION
2192 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2193 exit(EXIT_FAILURE);
2194 #else
2195 {
2196 int ptr = 0;
2197 macro_item *mlast = NULL;
2198 macro_item *m;
2199 uschar name[24];
2200 uschar *s = argrest;
2201
2202 while (isspace(*s)) s++;
2203
2204 if (*s < 'A' || *s > 'Z')
2205 {
2206 fprintf(stderr, "exim: macro name set by -D must start with "
2207 "an upper case letter\n");
2208 exit(EXIT_FAILURE);
2209 }
2210
2211 while (isalnum(*s) || *s == '_')
2212 {
2213 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2214 s++;
2215 }
2216 name[ptr] = 0;
2217 if (ptr == 0) { badarg = TRUE; break; }
2218 while (isspace(*s)) s++;
2219 if (*s != 0)
2220 {
2221 if (*s++ != '=') { badarg = TRUE; break; }
2222 while (isspace(*s)) s++;
2223 }
2224
2225 for (m = macros; m != NULL; m = m->next)
2226 {
2227 if (Ustrcmp(m->name, name) == 0)
2228 {
2229 fprintf(stderr, "exim: duplicated -D in command line\n");
2230 exit(EXIT_FAILURE);
2231 }
2232 mlast = m;
2233 }
2234
2235 m = store_get(sizeof(macro_item) + Ustrlen(name));
2236 m->next = NULL;
2237 m->command_line = TRUE;
2238 if (mlast == NULL) macros = m; else mlast->next = m;
2239 Ustrcpy(m->name, name);
2240 m->replacement = string_copy(s);
2241
2242 if (clmacro_count >= MAX_CLMACROS)
2243 {
2244 fprintf(stderr, "exim: too many -D options on command line\n");
2245 exit(EXIT_FAILURE);
2246 }
2247 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2248 m->replacement);
2249 }
2250 #endif
2251 break;
2252
2253 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2254 The latter is now a no-op, retained for compatibility only. If -dd is used,
2255 debugging subprocesses of the daemon is disabled. */
2256
2257 case 'd':
2258 if (Ustrcmp(argrest, "ropcr") == 0)
2259 {
2260 /* drop_cr = TRUE; */
2261 }
2262
2263 /* Use an intermediate variable so that we don't set debugging while
2264 decoding the debugging bits. */
2265
2266 else
2267 {
2268 unsigned int selector = D_default;
2269 debug_selector = 0;
2270 debug_file = NULL;
2271 if (*argrest == 'd')
2272 {
2273 debug_daemon = TRUE;
2274 argrest++;
2275 }
2276 if (*argrest != 0)
2277 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2278 debug_options_count, US"debug", 0);
2279 debug_selector = selector;
2280 }
2281 break;
2282
2283
2284 /* -E: This is a local error message. This option is not intended for
2285 external use at all, but is not restricted to trusted callers because it
2286 does no harm (just suppresses certain error messages) and if Exim is run
2287 not setuid root it won't always be trusted when it generates error
2288 messages using this option. If there is a message id following -E, point
2289 message_reference at it, for logging. */
2290
2291 case 'E':
2292 local_error_message = TRUE;
2293 if (mac_ismsgid(argrest)) message_reference = argrest;
2294 break;
2295
2296
2297 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2298 option, so it looks as if historically the -oex options are also callable
2299 without the leading -o. So we have to accept them. Before the switch,
2300 anything starting -oe has been converted to -e. Exim does not support all
2301 of the sendmail error options. */
2302
2303 case 'e':
2304 if (Ustrcmp(argrest, "e") == 0)
2305 {
2306 arg_error_handling = ERRORS_SENDER;
2307 errors_sender_rc = EXIT_SUCCESS;
2308 }
2309 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2310 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2311 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2312 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2313 else badarg = TRUE;
2314 break;
2315
2316
2317 /* -F: Set sender's full name, used instead of the gecos entry from
2318 the password file. Since users can usually alter their gecos entries,
2319 there's no security involved in using this instead. The data can follow
2320 the -F or be in the next argument. */
2321
2322 case 'F':
2323 if (*argrest == 0)
2324 {
2325 if(++i < argc) argrest = argv[i]; else
2326 { badarg = TRUE; break; }
2327 }
2328 originator_name = argrest;
2329 sender_name_forced = TRUE;
2330 break;
2331
2332
2333 /* -f: Set sender's address - this value is only actually used if Exim is
2334 run by a trusted user, or if untrusted_set_sender is set and matches the
2335 address, except that the null address can always be set by any user. The
2336 test for this happens later, when the value given here is ignored when not
2337 permitted. For an untrusted user, the actual sender is still put in Sender:
2338 if it doesn't match the From: header (unless no_local_from_check is set).
2339 The data can follow the -f or be in the next argument. The -r switch is an
2340 obsolete form of -f but since there appear to be programs out there that
2341 use anything that sendmail has ever supported, better accept it - the
2342 synonymizing is done before the switch above.
2343
2344 At this stage, we must allow domain literal addresses, because we don't
2345 know what the setting of allow_domain_literals is yet. Ditto for trailing
2346 dots and strip_trailing_dot. */
2347
2348 case 'f':
2349 {
2350 int start, end;
2351 uschar *errmess;
2352 if (*argrest == 0)
2353 {
2354 if (i+1 < argc) argrest = argv[++i]; else
2355 { badarg = TRUE; break; }
2356 }
2357 if (*argrest == 0)
2358 {
2359 sender_address = string_sprintf(""); /* Ensure writeable memory */
2360 }
2361 else
2362 {
2363 uschar *temp = argrest + Ustrlen(argrest) - 1;
2364 while (temp >= argrest && isspace(*temp)) temp--;
2365 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2366 allow_domain_literals = TRUE;
2367 strip_trailing_dot = TRUE;
2368 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2369 &sender_address_domain, TRUE);
2370 allow_domain_literals = FALSE;
2371 strip_trailing_dot = FALSE;
2372 if (sender_address == NULL)
2373 {
2374 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2375 return EXIT_FAILURE;
2376 }
2377 }
2378 sender_address_forced = TRUE;
2379 }
2380 break;
2381
2382 /* This is some Sendmail thing which can be ignored */
2383
2384 case 'G':
2385 break;
2386
2387 /* -h: Set the hop count for an incoming message. Exim does not currently
2388 support this; it always computes it by counting the Received: headers.
2389 To put it in will require a change to the spool header file format. */
2390
2391 case 'h':
2392 if (*argrest == 0)
2393 {
2394 if(++i < argc) argrest = argv[i]; else
2395 { badarg = TRUE; break; }
2396 }
2397 if (!isdigit(*argrest)) badarg = TRUE;
2398 break;
2399
2400
2401 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2402 not to be documented for sendmail but mailx (at least) uses it) */
2403
2404 case 'i':
2405 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2406 break;
2407
2408
2409 case 'M':
2410 receiving_message = FALSE;
2411
2412 /* -MC: continue delivery of another message via an existing open
2413 file descriptor. This option is used for an internal call by the
2414 smtp transport when there is a pending message waiting to go to an
2415 address to which it has got a connection. Five subsequent arguments are
2416 required: transport name, host name, IP address, sequence number, and
2417 message_id. Transports may decline to create new processes if the sequence
2418 number gets too big. The channel is stdin. This (-MC) must be the last
2419 argument. There's a subsequent check that the real-uid is privileged.
2420
2421 If we are running in the test harness. delay for a bit, to let the process
2422 that set this one up complete. This makes for repeatability of the logging,
2423 etc. output. */
2424
2425 if (Ustrcmp(argrest, "C") == 0)
2426 {
2427 union sockaddr_46 interface_sock;
2428 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2429
2430 if (argc != i + 6)
2431 {
2432 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2433 return EXIT_FAILURE;
2434 }
2435
2436 if (msg_action_arg >= 0)
2437 {
2438 fprintf(stderr, "exim: incompatible arguments\n");
2439 return EXIT_FAILURE;
2440 }
2441
2442 continue_transport = argv[++i];
2443 continue_hostname = argv[++i];
2444 continue_host_address = argv[++i];
2445 continue_sequence = Uatoi(argv[++i]);
2446 msg_action = MSG_DELIVER;
2447 msg_action_arg = ++i;
2448 forced_delivery = TRUE;
2449 queue_run_pid = passed_qr_pid;
2450 queue_run_pipe = passed_qr_pipe;
2451
2452 if (!mac_ismsgid(argv[i]))
2453 {
2454 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2455 argv[i]);
2456 return EXIT_FAILURE;
2457 }
2458
2459 /* Set up $sending_ip_address and $sending_port */
2460
2461 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2462 &size) == 0)
2463 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2464 &sending_port);
2465 else
2466 {
2467 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2468 strerror(errno));
2469 return EXIT_FAILURE;
2470 }
2471
2472 if (running_in_test_harness) millisleep(500);
2473 break;
2474 }
2475
2476 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2477 precedes -MC (see above). The flag indicates that the host to which
2478 Exim is connected has accepted an AUTH sequence. */
2479
2480 else if (Ustrcmp(argrest, "CA") == 0)
2481 {
2482 smtp_authenticated = TRUE;
2483 break;
2484 }
2485
2486 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2487 it preceded -MC (see above) */
2488
2489 else if (Ustrcmp(argrest, "CP") == 0)
2490 {
2491 smtp_use_pipelining = TRUE;
2492 break;
2493 }
2494
2495 /* -MCQ: pass on the pid of the queue-running process that started
2496 this chain of deliveries and the fd of its synchronizing pipe; this
2497 is useful only when it precedes -MC (see above) */
2498
2499 else if (Ustrcmp(argrest, "CQ") == 0)
2500 {
2501 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2502 else badarg = TRUE;
2503 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2504 else badarg = TRUE;
2505 break;
2506 }
2507
2508 /* -MCS: set the smtp_use_size flag; this is useful only when it
2509 precedes -MC (see above) */
2510
2511 else if (Ustrcmp(argrest, "CS") == 0)
2512 {
2513 smtp_use_size = TRUE;
2514 break;
2515 }
2516
2517 /* -MCT: set the tls_offered flag; this is useful only when it
2518 precedes -MC (see above). The flag indicates that the host to which
2519 Exim is connected has offered TLS support. */
2520
2521 #ifdef SUPPORT_TLS
2522 else if (Ustrcmp(argrest, "CT") == 0)
2523 {
2524 tls_offered = TRUE;
2525 break;
2526 }
2527 #endif
2528
2529 /* -M[x]: various operations on the following list of message ids:
2530 -M deliver the messages, ignoring next retry times and thawing
2531 -Mc deliver the messages, checking next retry times, no thawing
2532 -Mf freeze the messages
2533 -Mg give up on the messages
2534 -Mt thaw the messages
2535 -Mrm remove the messages
2536 In the above cases, this must be the last option. There are also the
2537 following options which are followed by a single message id, and which
2538 act on that message. Some of them use the "recipient" addresses as well.
2539 -Mar add recipient(s)
2540 -Mmad mark all recipients delivered
2541 -Mmd mark recipients(s) delivered
2542 -Mes edit sender
2543 -Mset load a message for use with -be
2544 -Mvb show body
2545 -Mvc show copy (of whole message, in RFC 2822 format)
2546 -Mvh show header
2547 -Mvl show log
2548 */
2549
2550 else if (*argrest == 0)
2551 {
2552 msg_action = MSG_DELIVER;
2553 forced_delivery = deliver_force_thaw = TRUE;
2554 }
2555 else if (Ustrcmp(argrest, "ar") == 0)
2556 {
2557 msg_action = MSG_ADD_RECIPIENT;
2558 one_msg_action = TRUE;
2559 }
2560 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2561 else if (Ustrcmp(argrest, "es") == 0)
2562 {
2563 msg_action = MSG_EDIT_SENDER;
2564 one_msg_action = TRUE;
2565 }
2566 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2567 else if (Ustrcmp(argrest, "g") == 0)
2568 {
2569 msg_action = MSG_DELIVER;
2570 deliver_give_up = TRUE;
2571 }
2572 else if (Ustrcmp(argrest, "mad") == 0)
2573 {
2574 msg_action = MSG_MARK_ALL_DELIVERED;
2575 }
2576 else if (Ustrcmp(argrest, "md") == 0)
2577 {
2578 msg_action = MSG_MARK_DELIVERED;
2579 one_msg_action = TRUE;
2580 }
2581 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2582 else if (Ustrcmp(argrest, "set") == 0)
2583 {
2584 msg_action = MSG_LOAD;
2585 one_msg_action = TRUE;
2586 }
2587 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2588 else if (Ustrcmp(argrest, "vb") == 0)
2589 {
2590 msg_action = MSG_SHOW_BODY;
2591 one_msg_action = TRUE;
2592 }
2593 else if (Ustrcmp(argrest, "vc") == 0)
2594 {
2595 msg_action = MSG_SHOW_COPY;
2596 one_msg_action = TRUE;
2597 }
2598 else if (Ustrcmp(argrest, "vh") == 0)
2599 {
2600 msg_action = MSG_SHOW_HEADER;
2601 one_msg_action = TRUE;
2602 }
2603 else if (Ustrcmp(argrest, "vl") == 0)
2604 {
2605 msg_action = MSG_SHOW_LOG;
2606 one_msg_action = TRUE;
2607 }
2608 else { badarg = TRUE; break; }
2609
2610 /* All the -Mxx options require at least one message id. */
2611
2612 msg_action_arg = i + 1;
2613 if (msg_action_arg >= argc)
2614 {
2615 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2616 return EXIT_FAILURE;
2617 }
2618
2619 /* Some require only message ids to follow */
2620
2621 if (!one_msg_action)
2622 {
2623 int j;
2624 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2625 {
2626 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2627 argv[j], arg);
2628 return EXIT_FAILURE;
2629 }
2630 goto END_ARG; /* Remaining args are ids */
2631 }
2632
2633 /* Others require only one message id, possibly followed by addresses,
2634 which will be handled as normal arguments. */
2635
2636 else
2637 {
2638 if (!mac_ismsgid(argv[msg_action_arg]))
2639 {
2640 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2641 argv[msg_action_arg], arg);
2642 return EXIT_FAILURE;
2643 }
2644 i++;
2645 }
2646 break;
2647
2648
2649 /* Some programs seem to call the -om option without the leading o;
2650 for sendmail it askes for "me too". Exim always does this. */
2651
2652 case 'm':
2653 if (*argrest != 0) badarg = TRUE;
2654 break;
2655
2656
2657 /* -N: don't do delivery - a debugging option that stops transports doing
2658 their thing. It implies debugging at the D_v level. */
2659
2660 case 'N':
2661 if (*argrest == 0)
2662 {
2663 dont_deliver = TRUE;
2664 debug_selector |= D_v;
2665 debug_file = stderr;
2666 }
2667 else badarg = TRUE;
2668 break;
2669
2670
2671 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2672 it. */
2673
2674 case 'n':
2675 break;
2676
2677 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2678 option to the specified value. This form uses long names. We need to handle
2679 -O option=value and -Ooption=value. */
2680
2681 case 'O':
2682 if (*argrest == 0)
2683 {
2684 if (++i >= argc)
2685 {
2686 fprintf(stderr, "exim: string expected after -O\n");
2687 exit(EXIT_FAILURE);
2688 }
2689 }
2690 break;
2691
2692 case 'o':
2693
2694 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2695 file" option). */
2696
2697 if (*argrest == 'A')
2698 {
2699 alias_arg = argrest + 1;
2700 if (alias_arg[0] == 0)
2701 {
2702 if (i+1 < argc) alias_arg = argv[++i]; else
2703 {
2704 fprintf(stderr, "exim: string expected after -oA\n");
2705 exit(EXIT_FAILURE);
2706 }
2707 }
2708 }
2709
2710 /* -oB: Set a connection message max value for remote deliveries */
2711
2712 else if (*argrest == 'B')
2713 {
2714 uschar *p = argrest + 1;
2715 if (p[0] == 0)
2716 {
2717 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2718 {
2719 connection_max_messages = 1;
2720 p = NULL;
2721 }
2722 }
2723
2724 if (p != NULL)
2725 {
2726 if (!isdigit(*p))
2727 {
2728 fprintf(stderr, "exim: number expected after -oB\n");
2729 exit(EXIT_FAILURE);
2730 }
2731 connection_max_messages = Uatoi(p);
2732 }
2733 }
2734
2735 /* -odb: background delivery */
2736
2737 else if (Ustrcmp(argrest, "db") == 0)
2738 {
2739 synchronous_delivery = FALSE;
2740 arg_queue_only = FALSE;
2741 queue_only_set = TRUE;
2742 }
2743
2744 /* -odf: foreground delivery (smail-compatible option); same effect as
2745 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2746 */
2747
2748 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2749 {
2750 synchronous_delivery = TRUE;
2751 arg_queue_only = FALSE;
2752 queue_only_set = TRUE;
2753 }
2754
2755 /* -odq: queue only */
2756
2757 else if (Ustrcmp(argrest, "dq") == 0)
2758 {
2759 synchronous_delivery = FALSE;
2760 arg_queue_only = TRUE;
2761 queue_only_set = TRUE;
2762 }
2763
2764 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2765 but no remote delivery */
2766
2767 else if (Ustrcmp(argrest, "dqs") == 0)
2768 {
2769 queue_smtp = TRUE;
2770 arg_queue_only = FALSE;
2771 queue_only_set = TRUE;
2772 }
2773
2774 /* -oex: Sendmail error flags. As these are also accepted without the
2775 leading -o prefix, for compatibility with vacation and other callers,
2776 they are handled with -e above. */
2777
2778 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2779 -oitrue: Another sendmail syntax for the same */
2780
2781 else if (Ustrcmp(argrest, "i") == 0 ||
2782 Ustrcmp(argrest, "itrue") == 0)
2783 dot_ends = FALSE;
2784
2785 /* -oM*: Set various characteristics for an incoming message; actually
2786 acted on for trusted callers only. */
2787
2788 else if (*argrest == 'M')
2789 {
2790 if (i+1 >= argc)
2791 {
2792 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2793 exit(EXIT_FAILURE);
2794 }
2795
2796 /* -oMa: Set sender host address */
2797
2798 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2799
2800 /* -oMaa: Set authenticator name */
2801
2802 else if (Ustrcmp(argrest, "Maa") == 0)
2803 sender_host_authenticated = argv[++i];
2804
2805 /* -oMas: setting authenticated sender */
2806
2807 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2808
2809 /* -oMai: setting authenticated id */
2810
2811 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2812
2813 /* -oMi: Set incoming interface address */
2814
2815 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2816
2817 /* -oMr: Received protocol */
2818
2819 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2820
2821 /* -oMs: Set sender host name */
2822
2823 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2824
2825 /* -oMt: Set sender ident */
2826
2827 else if (Ustrcmp(argrest, "Mt") == 0)
2828 {
2829 sender_ident_set = TRUE;
2830 sender_ident = argv[++i];
2831 }
2832
2833 /* Else a bad argument */
2834
2835 else
2836 {
2837 badarg = TRUE;
2838 break;
2839 }
2840 }
2841
2842 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2843 seem to call this as -m (undocumented), so that is also accepted (see
2844 above). */
2845
2846 else if (Ustrcmp(argrest, "m") == 0) {}
2847
2848 /* -oo: An ancient flag for old-style addresses which still seems to
2849 crop up in some calls (see in SCO). */
2850
2851 else if (Ustrcmp(argrest, "o") == 0) {}
2852
2853 /* -oP <name>: set pid file path for daemon */
2854
2855 else if (Ustrcmp(argrest, "P") == 0)
2856 override_pid_file_path = argv[++i];
2857
2858 /* -or <n>: set timeout for non-SMTP acceptance
2859 -os <n>: set timeout for SMTP acceptance */
2860
2861 else if (*argrest == 'r' || *argrest == 's')
2862 {
2863 int *tp = (*argrest == 'r')?
2864 &arg_receive_timeout : &arg_smtp_receive_timeout;
2865 if (argrest[1] == 0)
2866 {
2867 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2868 }
2869 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2870 if (*tp < 0)
2871 {
2872 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2873 exit(EXIT_FAILURE);
2874 }
2875 }
2876
2877 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2878
2879 else if (Ustrcmp(argrest, "X") == 0)
2880 override_local_interfaces = argv[++i];
2881
2882 /* Unknown -o argument */
2883
2884 else badarg = TRUE;
2885 break;
2886
2887
2888 /* -ps: force Perl startup; -pd force delayed Perl startup */
2889
2890 case 'p':
2891 #ifdef EXIM_PERL
2892 if (*argrest == 's' && argrest[1] == 0)
2893 {
2894 perl_start_option = 1;
2895 break;
2896 }
2897 if (*argrest == 'd' && argrest[1] == 0)
2898 {
2899 perl_start_option = -1;
2900 break;
2901 }
2902 #endif
2903
2904 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2905 which sets the host protocol and host name */
2906
2907 if (*argrest == 0)
2908 {
2909 if (i+1 < argc) argrest = argv[++i]; else
2910 { badarg = TRUE; break; }
2911 }
2912
2913 if (*argrest != 0)
2914 {
2915 uschar *hn = Ustrchr(argrest, ':');
2916 if (hn == NULL)
2917 {
2918 received_protocol = argrest;
2919 }
2920 else
2921 {
2922 received_protocol = string_copyn(argrest, hn - argrest);
2923 sender_host_name = hn + 1;
2924 }
2925 }
2926 break;
2927
2928
2929 case 'q':
2930 receiving_message = FALSE;
2931 if (queue_interval >= 0)
2932 {
2933 fprintf(stderr, "exim: -q specified more than once\n");
2934 exit(EXIT_FAILURE);
2935 }
2936
2937 /* -qq...: Do queue runs in a 2-stage manner */
2938
2939 if (*argrest == 'q')
2940 {
2941 queue_2stage = TRUE;
2942 argrest++;
2943 }
2944
2945 /* -qi...: Do only first (initial) deliveries */
2946
2947 if (*argrest == 'i')
2948 {
2949 queue_run_first_delivery = TRUE;
2950 argrest++;
2951 }
2952
2953 /* -qf...: Run the queue, forcing deliveries
2954 -qff..: Ditto, forcing thawing as well */
2955
2956 if (*argrest == 'f')
2957 {
2958 queue_run_force = TRUE;
2959 if (*(++argrest) == 'f')
2960 {
2961 deliver_force_thaw = TRUE;
2962 argrest++;
2963 }
2964 }
2965
2966 /* -q[f][f]l...: Run the queue only on local deliveries */
2967
2968 if (*argrest == 'l')
2969 {
2970 queue_run_local = TRUE;
2971 argrest++;
2972 }
2973
2974 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2975 optionally starting from a given message id. */
2976
2977 if (*argrest == 0 &&
2978 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2979 {
2980 queue_interval = 0;
2981 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2982 start_queue_run_id = argv[++i];
2983 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2984 stop_queue_run_id = argv[++i];
2985 }
2986
2987 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2988 optionally local only. */
2989
2990 else
2991 {
2992 if (*argrest != 0)
2993 queue_interval = readconf_readtime(argrest, 0, FALSE);
2994 else
2995 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2996 if (queue_interval <= 0)
2997 {
2998 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2999 exit(EXIT_FAILURE);
3000 }
3001 }
3002 break;
3003
3004
3005 case 'R': /* Synonymous with -qR... */
3006 receiving_message = FALSE;
3007
3008 /* -Rf: As -R (below) but force all deliveries,
3009 -Rff: Ditto, but also thaw all frozen messages,
3010 -Rr: String is regex
3011 -Rrf: Regex and force
3012 -Rrff: Regex and force and thaw
3013
3014 in all cases provided there are no further characters in this
3015 argument. */
3016
3017 if (*argrest != 0)
3018 {
3019 int i;
3020 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3021 {
3022 if (Ustrcmp(argrest, rsopts[i]) == 0)
3023 {
3024 if (i != 2) queue_run_force = TRUE;
3025 if (i >= 2) deliver_selectstring_regex = TRUE;
3026 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3027 argrest += Ustrlen(rsopts[i]);
3028 }
3029 }
3030 }
3031
3032 /* -R: Set string to match in addresses for forced queue run to
3033 pick out particular messages. */
3034
3035 if (*argrest == 0)
3036 {
3037 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3038 {
3039 fprintf(stderr, "exim: string expected after -R\n");
3040 exit(EXIT_FAILURE);
3041 }
3042 }
3043 else deliver_selectstring = argrest;
3044 break;
3045
3046
3047 /* -r: an obsolete synonym for -f (see above) */
3048
3049
3050 /* -S: Like -R but works on sender. */
3051
3052 case 'S': /* Synonymous with -qS... */
3053 receiving_message = FALSE;
3054
3055 /* -Sf: As -S (below) but force all deliveries,
3056 -Sff: Ditto, but also thaw all frozen messages,
3057 -Sr: String is regex
3058 -Srf: Regex and force
3059 -Srff: Regex and force and thaw
3060
3061 in all cases provided there are no further characters in this
3062 argument. */
3063
3064 if (*argrest != 0)
3065 {
3066 int i;
3067 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3068 {
3069 if (Ustrcmp(argrest, rsopts[i]) == 0)
3070 {
3071 if (i != 2) queue_run_force = TRUE;
3072 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3073 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3074 argrest += Ustrlen(rsopts[i]);
3075 }
3076 }
3077 }
3078
3079 /* -S: Set string to match in addresses for forced queue run to
3080 pick out particular messages. */
3081
3082 if (*argrest == 0)
3083 {
3084 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3085 {
3086 fprintf(stderr, "exim: string expected after -S\n");
3087 exit(EXIT_FAILURE);
3088 }
3089 }
3090 else deliver_selectstring_sender = argrest;
3091 break;
3092
3093 /* -Tqt is an option that is exclusively for use by the testing suite.
3094 It is not recognized in other circumstances. It allows for the setting up
3095 of explicit "queue times" so that various warning/retry things can be
3096 tested. Otherwise variability of clock ticks etc. cause problems. */
3097
3098 case 'T':
3099 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3100 fudged_queue_times = argv[++i];
3101 else badarg = TRUE;
3102 break;
3103
3104
3105 /* -t: Set flag to extract recipients from body of message. */
3106
3107 case 't':
3108 if (*argrest == 0) extract_recipients = TRUE;
3109
3110 /* -ti: Set flag to extract recipients from body of message, and also
3111 specify that dot does not end the message. */
3112
3113 else if (Ustrcmp(argrest, "i") == 0)
3114 {
3115 extract_recipients = TRUE;
3116 dot_ends = FALSE;
3117 }
3118
3119 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3120
3121 #ifdef SUPPORT_TLS
3122 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
3123 #endif
3124
3125 else badarg = TRUE;
3126 break;
3127
3128
3129 /* -U: This means "initial user submission" in sendmail, apparently. The
3130 doc claims that in future sendmail may refuse syntactically invalid
3131 messages instead of fixing them. For the moment, we just ignore it. */
3132
3133 case 'U':
3134 break;
3135
3136
3137 /* -v: verify things - this is a very low-level debugging */
3138
3139 case 'v':
3140 if (*argrest == 0)
3141 {
3142 debug_selector |= D_v;
3143 debug_file = stderr;
3144 }
3145 else badarg = TRUE;
3146 break;
3147
3148
3149 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3150
3151 The -x flag tells the sendmail command that mail from a local
3152 mail program has National Language Support (NLS) extended characters
3153 in the body of the mail item. The sendmail command can send mail with
3154 extended NLS characters across networks that normally corrupts these
3155 8-bit characters.
3156
3157 As Exim is 8-bit clean, it just ignores this flag. */
3158
3159 case 'x':
3160 if (*argrest != 0) badarg = TRUE;
3161 break;
3162
3163 /* All other initial characters are errors */
3164
3165 default:
3166 badarg = TRUE;
3167 break;
3168 } /* End of high-level switch statement */
3169
3170 /* Failed to recognize the option, or syntax error */
3171
3172 if (badarg)
3173 {
3174 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3175 "option %s\n", arg);
3176 exit(EXIT_FAILURE);
3177 }
3178 }
3179
3180
3181 /* If -R or -S have been specified without -q, assume a single queue run. */
3182
3183 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3184 queue_interval < 0) queue_interval = 0;
3185
3186
3187 END_ARG:
3188 /* If usage_wanted is set we call the usage function - which never returns */
3189 if (usage_wanted) exim_usage(called_as);
3190
3191 /* Arguments have been processed. Check for incompatibilities. */
3192 if ((
3193 (smtp_input || extract_recipients || recipients_arg < argc) &&
3194 (daemon_listen || queue_interval >= 0 || bi_option ||
3195 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3196 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3197 ) ||
3198 (
3199 msg_action_arg > 0 &&
3200 (daemon_listen || queue_interval >= 0 || list_options ||
3201 (checking && msg_action != MSG_LOAD) ||
3202 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3203 ) ||
3204 (
3205 (daemon_listen || queue_interval >= 0) &&
3206 (sender_address != NULL || list_options || list_queue || checking ||
3207 bi_option)
3208 ) ||
3209 (
3210 daemon_listen && queue_interval == 0
3211 ) ||
3212 (
3213 list_options &&
3214 (checking || smtp_input || extract_recipients ||
3215 filter_test != FTEST_NONE || bi_option)
3216 ) ||
3217 (
3218 verify_address_mode &&
3219 (address_test_mode || smtp_input || extract_recipients ||
3220 filter_test != FTEST_NONE || bi_option)
3221 ) ||
3222 (
3223 address_test_mode && (smtp_input || extract_recipients ||
3224 filter_test != FTEST_NONE || bi_option)
3225 ) ||
3226 (
3227 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3228 extract_recipients)
3229 ) ||
3230 (
3231 deliver_selectstring != NULL && queue_interval < 0
3232 ) ||
3233 (
3234 msg_action == MSG_LOAD &&
3235 (!expansion_test || expansion_test_message != NULL)
3236 )
3237 )
3238 {
3239 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3240 exit(EXIT_FAILURE);
3241 }
3242
3243 /* If debugging is set up, set the file and the file descriptor to pass on to
3244 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3245 to run in the foreground. */
3246
3247 if (debug_selector != 0)
3248 {
3249 debug_file = stderr;
3250 debug_fd = fileno(debug_file);
3251 background_daemon = FALSE;
3252 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3253 if (debug_selector != D_v) /* -v only doesn't show this */
3254 {
3255 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3256 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3257 debug_selector);
3258 if (!version_printed)
3259 show_whats_supported(stderr);
3260 }
3261 }
3262
3263 /* When started with root privilege, ensure that the limits on the number of
3264 open files and the number of processes (where that is accessible) are
3265 sufficiently large, or are unset, in case Exim has been called from an
3266 environment where the limits are screwed down. Not all OS have the ability to
3267 change some of these limits. */
3268
3269 if (unprivileged)
3270 {
3271 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3272 }
3273 else
3274 {
3275 struct rlimit rlp;
3276
3277 #ifdef RLIMIT_NOFILE
3278 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3279 {
3280 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3281 strerror(errno));
3282 rlp.rlim_cur = rlp.rlim_max = 0;
3283 }
3284
3285 /* I originally chose 1000 as a nice big number that was unlikely to
3286 be exceeded. It turns out that some older OS have a fixed upper limit of
3287 256. */
3288
3289 if (rlp.rlim_cur < 1000)
3290 {
3291 rlp.rlim_cur = rlp.rlim_max = 1000;
3292 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3293 {
3294 rlp.rlim_cur = rlp.rlim_max = 256;
3295 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3296 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3297 strerror(errno));
3298 }
3299 }
3300 #endif
3301
3302 #ifdef RLIMIT_NPROC
3303 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3304 {
3305 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3306 strerror(errno));
3307 rlp.rlim_cur = rlp.rlim_max = 0;
3308 }
3309
3310 #ifdef RLIM_INFINITY
3311 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3312 {
3313 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3314 #else
3315 if (rlp.rlim_cur < 1000)
3316 {
3317 rlp.rlim_cur = rlp.rlim_max = 1000;
3318 #endif
3319 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3320 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3321 strerror(errno));
3322 }
3323 #endif
3324 }
3325
3326 /* Exim is normally entered as root (but some special configurations are
3327 possible that don't do this). However, it always spins off sub-processes that
3328 set their uid and gid as required for local delivery. We don't want to pass on
3329 any extra groups that root may belong to, so we want to get rid of them all at
3330 this point.
3331
3332 We need to obey setgroups() at this stage, before possibly giving up root
3333 privilege for a changed configuration file, but later on we might need to
3334 check on the additional groups for the admin user privilege - can't do that
3335 till after reading the config, which might specify the exim gid. Therefore,
3336 save the group list here first. */
3337
3338 group_count = getgroups(NGROUPS_MAX, group_list);
3339 if (group_count < 0)
3340 {
3341 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3342 exit(EXIT_FAILURE);
3343 }
3344
3345 /* There is a fundamental difference in some BSD systems in the matter of
3346 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3347 known not to be different. On the "different" systems there is a single group
3348 list, and the first entry in it is the current group. On all other versions of
3349 Unix there is a supplementary group list, which is in *addition* to the current
3350 group. Consequently, to get rid of all extraneous groups on a "standard" system
3351 you pass over 0 groups to setgroups(), while on a "different" system you pass
3352 over a single group - the current group, which is always the first group in the
3353 list. Calling setgroups() with zero groups on a "different" system results in
3354 an error return. The following code should cope with both types of system.
3355
3356 However, if this process isn't running as root, setgroups() can't be used
3357 since you have to be root to run it, even if throwing away groups. Not being
3358 root here happens only in some unusual configurations. We just ignore the
3359 error. */
3360
3361 if (setgroups(0, NULL) != 0)
3362 {
3363 if (setgroups(1, group_list) != 0 && !unprivileged)
3364 {
3365 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3366 exit(EXIT_FAILURE);
3367 }
3368 }
3369
3370 /* If the configuration file name has been altered by an argument on the
3371 command line (either a new file name or a macro definition) and the caller is
3372 not root, or if this is a filter testing run, remove any setuid privilege the
3373 program has and run as the underlying user.
3374
3375 The exim user is locked out of this, which severely restricts the use of -C
3376 for some purposes.
3377
3378 Otherwise, set the real ids to the effective values (should be root unless run
3379 from inetd, which it can either be root or the exim uid, if one is configured).
3380
3381 There is a private mechanism for bypassing some of this, in order to make it
3382 possible to test lots of configurations automatically, without having either to
3383 recompile each time, or to patch in an actual configuration file name and other
3384 values (such as the path name). If running in the test harness, pretend that
3385 configuration file changes and macro definitions haven't happened. */
3386
3387 if (( /* EITHER */
3388 (!trusted_config || /* Config changed, or */
3389 !macros_trusted()) && /* impermissible macros and */
3390 real_uid != root_uid && /* Not root, and */
3391 !running_in_test_harness /* Not fudged */
3392 ) || /* OR */
3393 expansion_test /* expansion testing */
3394 || /* OR */
3395 filter_test != FTEST_NONE) /* Filter testing */
3396 {
3397 setgroups(group_count, group_list);
3398 exim_setugid(real_uid, real_gid, FALSE,
3399 US"-C, -D, -be or -bf forces real uid");
3400 removed_privilege = TRUE;
3401
3402 /* In the normal case when Exim is called like this, stderr is available
3403 and should be used for any logging information because attempts to write
3404 to the log will usually fail. To arrange this, we unset really_exim. However,
3405 if no stderr is available there is no point - we might as well have a go
3406 at the log (if it fails, syslog will be written).
3407
3408 Note that if the invoker is Exim, the logs remain available. Messing with
3409 this causes unlogged successful deliveries. */
3410
3411 if ((log_stderr != NULL) && (real_uid != exim_uid))
3412 really_exim = FALSE;
3413 }
3414
3415 /* Privilege is to be retained for the moment. It may be dropped later,
3416 depending on the job that this Exim process has been asked to do. For now, set
3417 the real uid to the effective so that subsequent re-execs of Exim are done by a
3418 privileged user. */
3419
3420 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3421
3422 /* If testing a filter, open the file(s) now, before wasting time doing other
3423 setups and reading the message. */
3424
3425 if ((filter_test & FTEST_SYSTEM) != 0)
3426 {
3427 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3428 if (filter_sfd < 0)
3429 {
3430 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3431 strerror(errno));
3432 return EXIT_FAILURE;
3433 }
3434 }
3435
3436 if ((filter_test & FTEST_USER) != 0)
3437 {
3438 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3439 if (filter_ufd < 0)
3440 {
3441 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3442 strerror(errno));
3443 return EXIT_FAILURE;
3444 }
3445 }
3446
3447 /* Read the main runtime configuration data; this gives up if there
3448 is a failure. It leaves the configuration file open so that the subsequent
3449 configuration data for delivery can be read if needed. */
3450
3451 readconf_main();
3452
3453 /* Handle the decoding of logging options. */
3454
3455 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3456 log_selector_string, log_options, log_options_count, US"log", 0);
3457
3458 DEBUG(D_any)
3459 {
3460 debug_printf("configuration file is %s\n", config_main_filename);
3461 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3462 log_extra_selector);
3463 }
3464
3465 /* If domain literals are not allowed, check the sender address that was
3466 supplied with -f. Ditto for a stripped trailing dot. */
3467
3468 if (sender_address != NULL)
3469 {
3470 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3471 {
3472 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3473 "allowed\n", sender_address);
3474 return EXIT_FAILURE;
3475 }
3476 if (f_end_dot && !strip_trailing_dot)
3477 {
3478 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3479 "(trailing dot not allowed)\n", sender_address);
3480 return EXIT_FAILURE;
3481 }
3482 }
3483
3484 /* Paranoia check of maximum lengths of certain strings. There is a check
3485 on the length of the log file path in log.c, which will come into effect
3486 if there are any calls to write the log earlier than this. However, if we
3487 get this far but the string is very long, it is better to stop now than to
3488 carry on and (e.g.) receive a message and then have to collapse. The call to
3489 log_write() from here will cause the ultimate panic collapse if the complete
3490 file name exceeds the buffer length. */
3491
3492 if (Ustrlen(log_file_path) > 200)
3493 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3494 "log_file_path is longer than 200 chars: aborting");
3495
3496 if (Ustrlen(pid_file_path) > 200)
3497 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3498 "pid_file_path is longer than 200 chars: aborting");
3499
3500 if (Ustrlen(spool_directory) > 200)
3501 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3502 "spool_directory is longer than 200 chars: aborting");
3503
3504 /* Length check on the process name given to syslog for its TAG field,
3505 which is only permitted to be 32 characters or less. See RFC 3164. */
3506
3507 if (Ustrlen(syslog_processname) > 32)
3508 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3509 "syslog_processname is longer than 32 chars: aborting");
3510
3511 /* In some operating systems, the environment variable TMPDIR controls where
3512 temporary files are created; Exim doesn't use these (apart from when delivering
3513 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3514 If TMPDIR is found in the environment, reset it to the value defined in the
3515 TMPDIR macro, if this macro is defined. */
3516
3517 #ifdef TMPDIR
3518 {
3519 uschar **p;
3520 for (p = USS environ; *p != NULL; p++)
3521 {
3522 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3523 Ustrcmp(*p+7, TMPDIR) != 0)
3524 {
3525 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3526 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3527 *p = newp;
3528 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3529 }
3530 }
3531 }
3532 #endif
3533
3534 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3535 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3536 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3537 called by a user who has set the TZ variable. This then affects the timestamps
3538 in log files and in Received: headers, and any created Date: header lines. The
3539 required timezone is settable in the configuration file, so nothing can be done
3540 about this earlier - but hopefully nothing will normally be logged earlier than
3541 this. We have to make a new environment if TZ is wrong, but don't bother if
3542 timestamps_utc is set, because then all times are in UTC anyway. */
3543
3544 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3545 {
3546 timestamps_utc = TRUE;
3547 }
3548 else
3549 {
3550 uschar *envtz = US getenv("TZ");
3551 if ((envtz == NULL && timezone_string != NULL) ||
3552 (envtz != NULL &&
3553 (timezone_string == NULL ||
3554 Ustrcmp(timezone_string, envtz) != 0)))
3555 {
3556 uschar **p = USS environ;
3557 uschar **new;
3558 uschar **newp;
3559 int count = 0;
3560 while (*p++ != NULL) count++;
3561 if (envtz == NULL) count++;
3562 newp = new = malloc(sizeof(uschar *) * (count + 1));
3563 for (p = USS environ; *p != NULL; p++)
3564 {
3565 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3566 *newp++ = *p;
3567 }
3568 if (timezone_string != NULL)
3569 {
3570 *newp = malloc(Ustrlen(timezone_string) + 4);
3571 sprintf(CS *newp++, "TZ=%s", timezone_string);
3572 }
3573 *newp = NULL;
3574 environ = CSS new;
3575 tzset();
3576 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3577 tod_stamp(tod_log));
3578 }
3579 }
3580
3581 /* Handle the case when we have removed the setuid privilege because of -C or
3582 -D. This means that the caller of Exim was not root.
3583
3584 There is a problem if we were running as the Exim user. The sysadmin may
3585 expect this case to retain privilege because "the binary was called by the
3586 Exim user", but it hasn't, because either the -D option set macros, or the
3587 -C option set a non-trusted configuration file. There are two possibilities:
3588
3589 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3590 to do message deliveries. Thus, the fact that it is running as a
3591 non-privileged user is plausible, and might be wanted in some special
3592 configurations. However, really_exim will have been set false when
3593 privilege was dropped, to stop Exim trying to write to its normal log
3594 files. Therefore, re-enable normal log processing, assuming the sysadmin
3595 has set up the log directory correctly.
3596
3597 (2) If deliver_drop_privilege is not set, the configuration won't work as
3598 apparently intended, and so we log a panic message. In order to retain
3599 root for -C or -D, the caller must either be root or be invoking a
3600 trusted configuration file (when deliver_drop_privilege is false). */
3601
3602 if (removed_privilege && (!trusted_config || macros != NULL) &&
3603 real_uid == exim_uid)
3604 {
3605 if (deliver_drop_privilege)
3606 really_exim = TRUE; /* let logging work normally */
3607 else
3608 log_write(0, LOG_MAIN|LOG_PANIC,
3609 "exim user lost privilege for using %s option",
3610 trusted_config? "-D" : "-C");
3611 }
3612
3613 /* Start up Perl interpreter if Perl support is configured and there is a
3614 perl_startup option, and the configuration or the command line specifies
3615 initializing starting. Note that the global variables are actually called
3616 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3617
3618 #ifdef EXIM_PERL
3619 if (perl_start_option != 0)
3620 opt_perl_at_start = (perl_start_option > 0);
3621 if (opt_perl_at_start && opt_perl_startup != NULL)
3622 {
3623 uschar *errstr;
3624 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3625 errstr = init_perl(opt_perl_startup);
3626 if (errstr != NULL)
3627 {
3628 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3629 return EXIT_FAILURE;
3630 }
3631 opt_perl_started = TRUE;
3632 }
3633 #endif /* EXIM_PERL */
3634
3635 /* Initialise lookup_list
3636 If debugging, already called above via version reporting.
3637 This does mean that debugging causes the list to be initialised while root.
3638 This *should* be harmless -- all modules are loaded from a fixed dir and
3639 it's code that would, if not a module, be part of Exim already. */
3640 init_lookup_list();
3641
3642 /* Log the arguments of the call if the configuration file said so. This is
3643 a debugging feature for finding out what arguments certain MUAs actually use.
3644 Don't attempt it if logging is disabled, or if listing variables or if
3645 verifying/testing addresses or expansions. */
3646
3647 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3648 && really_exim && !list_options && !checking)
3649 {
3650 int i;
3651 uschar *p = big_buffer;
3652 Ustrcpy(p, "cwd=");
3653 (void)getcwd(CS p+4, big_buffer_size - 4);
3654 while (*p) p++;
3655 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3656 while (*p) p++;
3657 for (i = 0; i < argc; i++)
3658 {
3659 int len = Ustrlen(argv[i]);
3660 uschar *printing;
3661 uschar *quote;
3662 if (p + len + 8 >= big_buffer + big_buffer_size)
3663 {
3664 Ustrcpy(p, " ...");
3665 log_write(0, LOG_MAIN, "%s", big_buffer);
3666 Ustrcpy(big_buffer, "...");
3667 p = big_buffer + 3;
3668 }
3669 printing = string_printing(argv[i]);
3670 if (printing[0] == 0) quote = US"\""; else
3671 {
3672 uschar *pp = printing;
3673 quote = US"";
3674 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3675 }
3676 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3677 (p - big_buffer) - 4), printing, quote);
3678 while (*p) p++;
3679 }
3680
3681 if ((log_extra_selector & LX_arguments) != 0)
3682 log_write(0, LOG_MAIN, "%s", big_buffer);
3683 else
3684 debug_printf("%s\n", big_buffer);
3685 }
3686
3687 /* Set the working directory to be the top-level spool directory. We don't rely
3688 on this in the code, which always uses fully qualified names, but it's useful
3689 for core dumps etc. Don't complain if it fails - the spool directory might not
3690 be generally accessible and calls with the -C option (and others) have lost
3691 privilege by now. Before the chdir, we try to ensure that the directory exists.
3692 */
3693
3694 if (Uchdir(spool_directory) != 0)
3695 {
3696 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3697 (void)Uchdir(spool_directory);
3698 }
3699
3700 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3701 alias file. Exim doesn't have such a concept, but this call is screwed into
3702 Sun's YP makefiles. Handle this by calling a configured script, as the real
3703 user who called Exim. The -oA option can be used to pass an argument to the
3704 script. */
3705
3706 if (bi_option)
3707 {
3708 (void)fclose(config_file);
3709 if (bi_command != NULL)
3710 {
3711 int i = 0;
3712 uschar *argv[3];
3713 argv[i++] = bi_command;
3714 if (alias_arg != NULL) argv[i++] = alias_arg;
3715 argv[i++] = NULL;
3716
3717 setgroups(group_count, group_list);
3718 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3719
3720 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3721 (argv[1] == NULL)? US"" : argv[1]);
3722
3723 execv(CS argv[0], (char *const *)argv);
3724 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3725 exit(EXIT_FAILURE);
3726 }
3727 else
3728 {
3729 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3730 exit(EXIT_SUCCESS);
3731 }
3732 }
3733
3734 /* If an action on specific messages is requested, or if a daemon or queue
3735 runner is being started, we need to know if Exim was called by an admin user.
3736 This is the case if the real user is root or exim, or if the real group is
3737 exim, or if one of the supplementary groups is exim or a group listed in
3738 admin_groups. We don't fail all message actions immediately if not admin_user,
3739 since some actions can be performed by non-admin users. Instead, set admin_user
3740 for later interrogation. */
3741
3742 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3743 admin_user = TRUE;
3744 else
3745 {
3746 int i, j;
3747 for (i = 0; i < group_count; i++)
3748 {
3749 if (group_list[i] == exim_gid) admin_user = TRUE;
3750 else if (admin_groups != NULL)
3751 {
3752 for (j = 1; j <= (int)(admin_groups[0]); j++)
3753 if (admin_groups[j] == group_list[i])
3754 { admin_user = TRUE; break; }
3755 }
3756 if (admin_user) break;
3757 }
3758 }
3759
3760 /* Another group of privileged users are the trusted users. These are root,
3761 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3762 are permitted to specify sender_addresses with -f on the command line, and
3763 other message parameters as well. */
3764
3765 if (real_uid == root_uid || real_uid == exim_uid)
3766 trusted_caller = TRUE;
3767 else
3768 {
3769 int i, j;
3770
3771 if (trusted_users != NULL)
3772 {
3773 for (i = 1; i <= (int)(trusted_users[0]); i++)
3774 if (trusted_users[i] == real_uid)
3775 { trusted_caller = TRUE; break; }
3776 }
3777
3778 if (!trusted_caller && trusted_groups != NULL)
3779 {
3780 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3781 {
3782 if (trusted_groups[i] == real_gid)
3783 trusted_caller = TRUE;
3784 else for (j = 0; j < group_count; j++)
3785 {
3786 if (trusted_groups[i] == group_list[j])
3787 { trusted_caller = TRUE; break; }
3788 }
3789 if (trusted_caller) break;
3790 }
3791 }
3792 }
3793
3794 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3795 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3796
3797 /* Only an admin user may start the daemon or force a queue run in the default
3798 configuration, but the queue run restriction can be relaxed. Only an admin
3799 user may request that a message be returned to its sender forthwith. Only an
3800 admin user may specify a debug level greater than D_v (because it might show
3801 passwords, etc. in lookup queries). Only an admin user may request a queue
3802 count. Only an admin user can use the test interface to scan for email
3803 (because Exim will be in the spool dir and able to look at mails). */
3804
3805 if (!admin_user)
3806 {
3807 BOOL debugset = (debug_selector & ~D_v) != 0;
3808 if (deliver_give_up || daemon_listen || malware_test_file ||
3809 (count_queue && queue_list_requires_admin) ||
3810 (list_queue && queue_list_requires_admin) ||
3811 (queue_interval >= 0 && prod_requires_admin) ||
3812 (debugset && !running_in_test_harness))
3813 {
3814 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3815 exit(EXIT_FAILURE);
3816 }
3817 }
3818
3819 /* If the real user is not root or the exim uid, the argument for passing
3820 in an open TCP/IP connection for another message is not permitted, nor is
3821 running with the -N option for any delivery action, unless this call to exim is
3822 one that supplied an input message, or we are using a patched exim for
3823 regression testing. */
3824
3825 if (real_uid != root_uid && real_uid != exim_uid &&
3826 (continue_hostname != NULL ||
3827 (dont_deliver &&
3828 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3829 )) && !running_in_test_harness)
3830 {
3831 fprintf(stderr, "exim: Permission denied\n");
3832 return EXIT_FAILURE;
3833 }
3834
3835 /* If the caller is not trusted, certain arguments are ignored when running for
3836 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3837 Note that authority for performing certain actions on messages is tested in the
3838 queue_action() function. */
3839
3840 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3841 {
3842 sender_host_name = sender_host_address = interface_address =
3843 sender_ident = received_protocol = NULL;
3844 sender_host_port = interface_port = 0;
3845 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3846 }
3847
3848 /* If a sender host address is set, extract the optional port number off the
3849 end of it and check its syntax. Do the same thing for the interface address.
3850 Exim exits if the syntax is bad. */
3851
3852 else
3853 {
3854 if (sender_host_address != NULL)
3855 sender_host_port = check_port(sender_host_address);
3856 if (interface_address != NULL)
3857 interface_port = check_port(interface_address);
3858 }
3859
3860 /* If an SMTP message is being received check to see if the standard input is a
3861 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3862 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3863 barf. */
3864
3865 if (smtp_input)
3866 {
3867 union sockaddr_46 inetd_sock;
3868 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3869 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3870 {
3871 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3872 if (family == AF_INET || family == AF_INET6)
3873 {
3874 union sockaddr_46 interface_sock;
3875 size = sizeof(interface_sock);
3876
3877 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3878 interface_address = host_ntoa(-1, &interface_sock, NULL,
3879 &interface_port);
3880
3881 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3882
3883 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3884 {
3885 is_inetd = TRUE;
3886 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3887 NULL, &sender_host_port);
3888 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3889 "inetd is not supported when mua_wrapper is set");
3890 }
3891 else
3892 {
3893 fprintf(stderr,
3894 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3895 return EXIT_FAILURE;
3896 }
3897 }
3898 }
3899 }
3900
3901 /* If the load average is going to be needed while receiving a message, get it
3902 now for those OS that require the first call to os_getloadavg() to be done as
3903 root. There will be further calls later for each message received. */
3904
3905 #ifdef LOAD_AVG_NEEDS_ROOT
3906 if (receiving_message &&
3907 (queue_only_load >= 0 ||
3908 (is_inetd && smtp_load_reserve >= 0)
3909 ))
3910 {
3911 load_average = OS_GETLOADAVG();
3912 }
3913 #endif
3914
3915 /* The queue_only configuration option can be overridden by -odx on the command
3916 line, except that if queue_only_override is false, queue_only cannot be unset
3917 from the command line. */
3918
3919 if (queue_only_set && (queue_only_override || arg_queue_only))
3920 queue_only = arg_queue_only;
3921
3922 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3923 -or and -os. */
3924
3925 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3926 if (arg_smtp_receive_timeout >= 0)
3927 smtp_receive_timeout = arg_smtp_receive_timeout;
3928
3929 /* If Exim was started with root privilege, unless we have already removed the
3930 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3931 except when starting the daemon or doing some kind of delivery or address
3932 testing (-bt). These are the only cases when root need to be retained. We run
3933 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3934 retained only for starting the daemon. We always do the initgroups() in this
3935 situation (controlled by the TRUE below), in order to be as close as possible
3936 to the state Exim usually runs in. */
3937
3938 if (!unprivileged && /* originally had root AND */
3939 !removed_privilege && /* still got root AND */
3940 !daemon_listen && /* not starting the daemon */
3941 queue_interval <= 0 && /* (either kind of daemon) */
3942 ( /* AND EITHER */
3943 deliver_drop_privilege || /* requested unprivileged */
3944 ( /* OR */
3945 queue_interval < 0 && /* not running the queue */
3946 (msg_action_arg < 0 || /* and */
3947 msg_action != MSG_DELIVER) && /* not delivering and */
3948 (!checking || !address_test_mode) /* not address checking */
3949 )
3950 ))
3951 {
3952 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3953 }
3954
3955 /* When we are retaining a privileged uid, we still change to the exim gid. */
3956
3957 else
3958 {
3959 int rv;
3960 rv = setgid(exim_gid);
3961 /* Impact of failure is that some stuff might end up with an incorrect group.
3962 We track this for failures from root, since any attempt to change privilege
3963 by root should succeed and failures should be examined. For non-root,
3964 there's no security risk. For me, it's { exim -bV } on a just-built binary,
3965 no need to complain then. */
3966 if (rv == -1)
3967 {
3968 if (!(unprivileged || removed_privilege))
3969 {
3970 fprintf(stderr,
3971 "exim: changing group failed: %s\n", strerror(errno));
3972 exit(EXIT_FAILURE);
3973 }
3974 else
3975 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
3976 (long int)exim_gid, strerror(errno));
3977 }
3978 }
3979
3980 /* Handle a request to scan a file for malware */
3981 if (malware_test_file)
3982 {
3983 #ifdef WITH_CONTENT_SCAN
3984 int result;
3985 set_process_info("scanning file for malware");
3986 result = malware_in_file(malware_test_file);
3987 if (result == FAIL)
3988 {
3989 printf("No malware found.\n");
3990 exit(EXIT_SUCCESS);
3991 }
3992 if (result != OK)
3993 {
3994 printf("Malware lookup returned non-okay/fail: %d\n", result);
3995 exit(EXIT_FAILURE);
3996 }
3997 if (malware_name)
3998 printf("Malware found: %s\n", malware_name);
3999 else
4000 printf("Malware scan detected malware of unknown name.\n");
4001 #else
4002 printf("Malware scanning not enabled at compile time.\n");
4003 #endif
4004 exit(EXIT_FAILURE);
4005 }
4006
4007 /* Handle a request to list the delivery queue */
4008
4009 if (list_queue)
4010 {
4011 set_process_info("listing the queue");
4012 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4013 exit(EXIT_SUCCESS);
4014 }
4015
4016 /* Handle a request to count the delivery queue */
4017
4018 if (count_queue)
4019 {
4020 set_process_info("counting the queue");
4021 queue_count();
4022 exit(EXIT_SUCCESS);
4023 }
4024
4025 /* Handle actions on specific messages, except for the force delivery and
4026 message load actions, which are done below. Some actions take a whole list of
4027 message ids, which are known to continue up to the end of the arguments. Others
4028 take a single message id and then operate on the recipients list. */
4029
4030 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4031 {
4032 int yield = EXIT_SUCCESS;
4033 set_process_info("acting on specified messages");
4034
4035 if (!one_msg_action)
4036 {
4037 for (i = msg_action_arg; i < argc; i++)
4038 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4039 yield = EXIT_FAILURE;
4040 }
4041
4042 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4043 recipients_arg)) yield = EXIT_FAILURE;
4044 exit(yield);
4045 }
4046
4047 /* All the modes below here require the remaining configuration sections
4048 to be read, except that we can skip over the ACL setting when delivering
4049 specific messages, or doing a queue run. (For various testing cases we could
4050 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
4051 for skipping. */
4052
4053 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
4054
4055 /* The configuration data will have been read into POOL_PERM because we won't
4056 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4057 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4058 configuration were read into POOL_MAIN, because we don't do any resets till
4059 later on. However, it seems right, and it does ensure that both pools get used.
4060 */
4061
4062 store_pool = POOL_MAIN;
4063
4064 /* Handle the -brt option. This is for checking out retry configurations.
4065 The next three arguments are a domain name or a complete address, and
4066 optionally two error numbers. All it does is to call the function that
4067 scans the retry configuration data. */
4068
4069 if (test_retry_arg >= 0)
4070 {
4071 retry_config *yield;
4072 int basic_errno = 0;
4073 int more_errno = 0;
4074 uschar *s1, *s2;
4075
4076 if (test_retry_arg >= argc)
4077 {
4078 printf("-brt needs a domain or address argument\n");
4079 exim_exit(EXIT_FAILURE);
4080 }
4081 s1 = argv[test_retry_arg++];
4082 s2 = NULL;
4083
4084 /* If the first argument contains no @ and no . it might be a local user
4085 or it might be a single-component name. Treat as a domain. */
4086
4087 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4088 {
4089 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4090 "being \ntreated as a one-component domain, not as a local part.\n\n",
4091 s1);
4092 }
4093
4094 /* There may be an optional second domain arg. */
4095
4096 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4097 s2 = argv[test_retry_arg++];
4098
4099 /* The final arg is an error name */
4100
4101 if (test_retry_arg < argc)
4102 {
4103 uschar *ss = argv[test_retry_arg];
4104 uschar *error =
4105 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4106 if (error != NULL)
4107 {
4108 printf("%s\n", CS error);
4109 return EXIT_FAILURE;
4110 }
4111
4112 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4113 code > 100 as an error is for matching codes to the decade. Turn them into
4114 a real error code, off the decade. */
4115
4116 if (basic_errno == ERRNO_MAIL4XX ||
4117 basic_errno == ERRNO_RCPT4XX ||
4118 basic_errno == ERRNO_DATA4XX)
4119 {
4120 int code = (more_errno >> 8) & 255;
4121 if (code == 255)
4122 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4123 else if (code > 100)
4124 more_er