Check return values of setgid/setuid.
[exim.git] / src / src / exim.c
1 /* $Cambridge: exim/src/src/exim.c,v 1.71 2010/06/07 00:12:42 pdp Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2009 */
8 /* See the file NOTICE for conditions of use and distribution. */
9
10
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
13
14
15 #include "exim.h"
16
17 extern void init_lookup_list(void);
18
19
20
21 /*************************************************
22 * Function interface to store functions *
23 *************************************************/
24
25 /* We need some real functions to pass to the PCRE regular expression library
26 for store allocation via Exim's store manager. The normal calls are actually
27 macros that pass over location information to make tracing easier. These
28 functions just interface to the standard macro calls. A good compiler will
29 optimize out the tail recursion and so not make them too expensive. There
30 are two sets of functions; one for use when we want to retain the compiled
31 regular expression for a long time; the other for short-term use. */
32
33 static void *
34 function_store_get(size_t size)
35 {
36 return store_get((int)size);
37 }
38
39 static void
40 function_dummy_free(void *block) { block = block; }
41
42 static void *
43 function_store_malloc(size_t size)
44 {
45 return store_malloc((int)size);
46 }
47
48 static void
49 function_store_free(void *block)
50 {
51 store_free(block);
52 }
53
54
55
56
57 /*************************************************
58 * Compile regular expression and panic on fail *
59 *************************************************/
60
61 /* This function is called when failure to compile a regular expression leads
62 to a panic exit. In other cases, pcre_compile() is called directly. In many
63 cases where this function is used, the results of the compilation are to be
64 placed in long-lived store, so we temporarily reset the store management
65 functions that PCRE uses if the use_malloc flag is set.
66
67 Argument:
68 pattern the pattern to compile
69 caseless TRUE if caseless matching is required
70 use_malloc TRUE if compile into malloc store
71
72 Returns: pointer to the compiled pattern
73 */
74
75 const pcre *
76 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 {
78 int offset;
79 int options = PCRE_COPT;
80 const pcre *yield;
81 const uschar *error;
82 if (use_malloc)
83 {
84 pcre_malloc = function_store_malloc;
85 pcre_free = function_store_free;
86 }
87 if (caseless) options |= PCRE_CASELESS;
88 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
89 pcre_malloc = function_store_get;
90 pcre_free = function_dummy_free;
91 if (yield == NULL)
92 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
93 "%s at offset %d while compiling %s", error, offset, pattern);
94 return yield;
95 }
96
97
98
99
100 /*************************************************
101 * Execute regular expression and set strings *
102 *************************************************/
103
104 /* This function runs a regular expression match, and sets up the pointers to
105 the matched substrings.
106
107 Arguments:
108 re the compiled expression
109 subject the subject string
110 options additional PCRE options
111 setup if < 0 do full setup
112 if >= 0 setup from setup+1 onwards,
113 excluding the full matched string
114
115 Returns: TRUE or FALSE
116 */
117
118 BOOL
119 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
120 {
121 int ovector[3*(EXPAND_MAXN+1)];
122 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
123 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
124 BOOL yield = n >= 0;
125 if (n == 0) n = EXPAND_MAXN + 1;
126 if (yield)
127 {
128 int nn;
129 expand_nmax = (setup < 0)? 0 : setup + 1;
130 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
131 {
132 expand_nstring[expand_nmax] = subject + ovector[nn];
133 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
134 }
135 expand_nmax--;
136 }
137 return yield;
138 }
139
140
141
142
143 /*************************************************
144 * Handler for SIGUSR1 *
145 *************************************************/
146
147 /* SIGUSR1 causes any exim process to write to the process log details of
148 what it is currently doing. It will only be used if the OS is capable of
149 setting up a handler that causes automatic restarting of any system call
150 that is in progress at the time.
151
152 Argument: the signal number (SIGUSR1)
153 Returns: nothing
154 */
155
156 static void
157 usr1_handler(int sig)
158 {
159 sig = sig; /* Keep picky compilers happy */
160 log_write(0, LOG_PROCESS, "%s", process_info);
161 log_close_all();
162 os_restarting_signal(SIGUSR1, usr1_handler);
163 }
164
165
166
167 /*************************************************
168 * Timeout handler *
169 *************************************************/
170
171 /* This handler is enabled most of the time that Exim is running. The handler
172 doesn't actually get used unless alarm() has been called to set a timer, to
173 place a time limit on a system call of some kind. When the handler is run, it
174 re-enables itself.
175
176 There are some other SIGALRM handlers that are used in special cases when more
177 than just a flag setting is required; for example, when reading a message's
178 input. These are normally set up in the code module that uses them, and the
179 SIGALRM handler is reset to this one afterwards.
180
181 Argument: the signal value (SIGALRM)
182 Returns: nothing
183 */
184
185 void
186 sigalrm_handler(int sig)
187 {
188 sig = sig; /* Keep picky compilers happy */
189 sigalrm_seen = TRUE;
190 os_non_restarting_signal(SIGALRM, sigalrm_handler);
191 }
192
193
194
195 /*************************************************
196 * Sleep for a fractional time interval *
197 *************************************************/
198
199 /* This function is called by millisleep() and exim_wait_tick() to wait for a
200 period of time that may include a fraction of a second. The coding is somewhat
201 tedious. We do not expect setitimer() ever to fail, but if it does, the process
202 will wait for ever, so we panic in this instance. (There was a case of this
203 when a bug in a function that calls milliwait() caused it to pass invalid data.
204 That's when I added the check. :-)
205
206 Argument: an itimerval structure containing the interval
207 Returns: nothing
208 */
209
210 static void
211 milliwait(struct itimerval *itval)
212 {
213 sigset_t sigmask;
214 sigset_t old_sigmask;
215 (void)sigemptyset(&sigmask); /* Empty mask */
216 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
217 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
218 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
219 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
220 "setitimer() failed: %s", strerror(errno));
221 (void)sigfillset(&sigmask); /* All signals */
222 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
223 (void)sigsuspend(&sigmask); /* Until SIGALRM */
224 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
225 }
226
227
228
229
230 /*************************************************
231 * Millisecond sleep function *
232 *************************************************/
233
234 /* The basic sleep() function has a granularity of 1 second, which is too rough
235 in some cases - for example, when using an increasing delay to slow down
236 spammers.
237
238 Argument: number of millseconds
239 Returns: nothing
240 */
241
242 void
243 millisleep(int msec)
244 {
245 struct itimerval itval;
246 itval.it_interval.tv_sec = 0;
247 itval.it_interval.tv_usec = 0;
248 itval.it_value.tv_sec = msec/1000;
249 itval.it_value.tv_usec = (msec % 1000) * 1000;
250 milliwait(&itval);
251 }
252
253
254
255 /*************************************************
256 * Compare microsecond times *
257 *************************************************/
258
259 /*
260 Arguments:
261 tv1 the first time
262 tv2 the second time
263
264 Returns: -1, 0, or +1
265 */
266
267 int
268 exim_tvcmp(struct timeval *t1, struct timeval *t2)
269 {
270 if (t1->tv_sec > t2->tv_sec) return +1;
271 if (t1->tv_sec < t2->tv_sec) return -1;
272 if (t1->tv_usec > t2->tv_usec) return +1;
273 if (t1->tv_usec < t2->tv_usec) return -1;
274 return 0;
275 }
276
277
278
279
280 /*************************************************
281 * Clock tick wait function *
282 *************************************************/
283
284 /* Exim uses a time + a pid to generate a unique identifier in two places: its
285 message IDs, and in file names for maildir deliveries. Because some OS now
286 re-use pids within the same second, sub-second times are now being used.
287 However, for absolute certaintly, we must ensure the clock has ticked before
288 allowing the relevant process to complete. At the time of implementation of
289 this code (February 2003), the speed of processors is such that the clock will
290 invariably have ticked already by the time a process has done its job. This
291 function prepares for the time when things are faster - and it also copes with
292 clocks that go backwards.
293
294 Arguments:
295 then_tv A timeval which was used to create uniqueness; its usec field
296 has been rounded down to the value of the resolution.
297 We want to be sure the current time is greater than this.
298 resolution The resolution that was used to divide the microseconds
299 (1 for maildir, larger for message ids)
300
301 Returns: nothing
302 */
303
304 void
305 exim_wait_tick(struct timeval *then_tv, int resolution)
306 {
307 struct timeval now_tv;
308 long int now_true_usec;
309
310 (void)gettimeofday(&now_tv, NULL);
311 now_true_usec = now_tv.tv_usec;
312 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
313
314 if (exim_tvcmp(&now_tv, then_tv) <= 0)
315 {
316 struct itimerval itval;
317 itval.it_interval.tv_sec = 0;
318 itval.it_interval.tv_usec = 0;
319 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
320 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
321
322 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
323 negative value for the microseconds is possible only in the case when "now"
324 is more than a second less than "then". That means that itval.it_value.tv_sec
325 is greater than zero. The following correction is therefore safe. */
326
327 if (itval.it_value.tv_usec < 0)
328 {
329 itval.it_value.tv_usec += 1000000;
330 itval.it_value.tv_sec -= 1;
331 }
332
333 DEBUG(D_transport|D_receive)
334 {
335 if (!running_in_test_harness)
336 {
337 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
338 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
339 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
340 itval.it_value.tv_usec);
341 }
342 }
343
344 milliwait(&itval);
345 }
346 }
347
348
349
350
351 /*************************************************
352 * Set up processing details *
353 *************************************************/
354
355 /* Save a text string for dumping when SIGUSR1 is received.
356 Do checks for overruns.
357
358 Arguments: format and arguments, as for printf()
359 Returns: nothing
360 */
361
362 void
363 set_process_info(char *format, ...)
364 {
365 int len;
366 va_list ap;
367 sprintf(CS process_info, "%5d ", (int)getpid());
368 len = Ustrlen(process_info);
369 va_start(ap, format);
370 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
371 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
372 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
373 va_end(ap);
374 }
375
376
377
378
379
380 /*************************************************
381 * Call fopen() with umask 777 and adjust mode *
382 *************************************************/
383
384 /* Exim runs with umask(0) so that files created with open() have the mode that
385 is specified in the open() call. However, there are some files, typically in
386 the spool directory, that are created with fopen(). They end up world-writeable
387 if no precautions are taken. Although the spool directory is not accessible to
388 the world, this is an untidiness. So this is a wrapper function for fopen()
389 that sorts out the mode of the created file.
390
391 Arguments:
392 filename the file name
393 options the fopen() options
394 mode the required mode
395
396 Returns: the fopened FILE or NULL
397 */
398
399 FILE *
400 modefopen(uschar *filename, char *options, mode_t mode)
401 {
402 mode_t saved_umask = umask(0777);
403 FILE *f = Ufopen(filename, options);
404 (void)umask(saved_umask);
405 if (f != NULL) (void)fchmod(fileno(f), mode);
406 return f;
407 }
408
409
410
411
412 /*************************************************
413 * Ensure stdin, stdout, and stderr exist *
414 *************************************************/
415
416 /* Some operating systems grumble if an exec() happens without a standard
417 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
418 file will be opened and will use these fd values, and then some other bit of
419 code will assume, for example, that it can write error messages to stderr.
420 This function ensures that fds 0, 1, and 2 are open if they do not already
421 exist, by connecting them to /dev/null.
422
423 This function is also used to ensure that std{in,out,err} exist at all times,
424 so that if any library that Exim calls tries to use them, it doesn't crash.
425
426 Arguments: None
427 Returns: Nothing
428 */
429
430 void
431 exim_nullstd(void)
432 {
433 int i;
434 int devnull = -1;
435 struct stat statbuf;
436 for (i = 0; i <= 2; i++)
437 {
438 if (fstat(i, &statbuf) < 0 && errno == EBADF)
439 {
440 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
441 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
442 string_open_failed(errno, "/dev/null"));
443 if (devnull != i) (void)dup2(devnull, i);
444 }
445 }
446 if (devnull > 2) (void)close(devnull);
447 }
448
449
450
451
452 /*************************************************
453 * Close unwanted file descriptors for delivery *
454 *************************************************/
455
456 /* This function is called from a new process that has been forked to deliver
457 an incoming message, either directly, or using exec.
458
459 We want any smtp input streams to be closed in this new process. However, it
460 has been observed that using fclose() here causes trouble. When reading in -bS
461 input, duplicate copies of messages have been seen. The files will be sharing a
462 file pointer with the parent process, and it seems that fclose() (at least on
463 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
464 least sometimes. Hence we go for closing the underlying file descriptors.
465
466 If TLS is active, we want to shut down the TLS library, but without molesting
467 the parent's SSL connection.
468
469 For delivery of a non-SMTP message, we want to close stdin and stdout (and
470 stderr unless debugging) because the calling process might have set them up as
471 pipes and be waiting for them to close before it waits for the submission
472 process to terminate. If they aren't closed, they hold up the calling process
473 until the initial delivery process finishes, which is not what we want.
474
475 Exception: We do want it for synchronous delivery!
476
477 And notwithstanding all the above, if D_resolver is set, implying resolver
478 debugging, leave stdout open, because that's where the resolver writes its
479 debugging output.
480
481 When we close stderr (which implies we've also closed stdout), we also get rid
482 of any controlling terminal.
483
484 Arguments: None
485 Returns: Nothing
486 */
487
488 static void
489 close_unwanted(void)
490 {
491 if (smtp_input)
492 {
493 #ifdef SUPPORT_TLS
494 tls_close(FALSE); /* Shut down the TLS library */
495 #endif
496 (void)close(fileno(smtp_in));
497 (void)close(fileno(smtp_out));
498 smtp_in = NULL;
499 }
500 else
501 {
502 (void)close(0); /* stdin */
503 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
504 if (debug_selector == 0) /* stderr */
505 {
506 if (!synchronous_delivery)
507 {
508 (void)close(2);
509 log_stderr = NULL;
510 }
511 (void)setsid();
512 }
513 }
514 }
515
516
517
518
519 /*************************************************
520 * Set uid and gid *
521 *************************************************/
522
523 /* This function sets a new uid and gid permanently, optionally calling
524 initgroups() to set auxiliary groups. There are some special cases when running
525 Exim in unprivileged modes. In these situations the effective uid will not be
526 root; if we already have the right effective uid/gid, and don't need to
527 initialize any groups, leave things as they are.
528
529 Arguments:
530 uid the uid
531 gid the gid
532 igflag TRUE if initgroups() wanted
533 msg text to use in debugging output and failure log
534
535 Returns: nothing; bombs out on failure
536 */
537
538 void
539 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
540 {
541 uid_t euid = geteuid();
542 gid_t egid = getegid();
543
544 if (euid == root_uid || euid != uid || egid != gid || igflag)
545 {
546 /* At least one OS returns +1 for initgroups failure, so just check for
547 non-zero. */
548
549 if (igflag)
550 {
551 struct passwd *pw = getpwuid(uid);
552 if (pw != NULL)
553 {
554 if (initgroups(pw->pw_name, gid) != 0)
555 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
556 (long int)uid, strerror(errno));
557 }
558 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
559 "no passwd entry for uid=%ld", (long int)uid);
560 }
561
562 if (setgid(gid) < 0 || setuid(uid) < 0)
563 {
564 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
565 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
566 }
567 }
568
569 /* Debugging output included uid/gid and all groups */
570
571 DEBUG(D_uid)
572 {
573 int group_count;
574 gid_t group_list[NGROUPS_MAX];
575 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
576 (long int)geteuid(), (long int)getegid(), (long int)getpid());
577 group_count = getgroups(NGROUPS_MAX, group_list);
578 debug_printf(" auxiliary group list:");
579 if (group_count > 0)
580 {
581 int i;
582 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
583 }
584 else debug_printf(" <none>");
585 debug_printf("\n");
586 }
587 }
588
589
590
591
592 /*************************************************
593 * Exit point *
594 *************************************************/
595
596 /* Exim exits via this function so that it always clears up any open
597 databases.
598
599 Arguments:
600 rc return code
601
602 Returns: does not return
603 */
604
605 void
606 exim_exit(int rc)
607 {
608 search_tidyup();
609 DEBUG(D_any)
610 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
611 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
612 exit(rc);
613 }
614
615
616
617
618 /*************************************************
619 * Extract port from host address *
620 *************************************************/
621
622 /* Called to extract the port from the values given to -oMa and -oMi.
623 It also checks the syntax of the address, and terminates it before the
624 port data when a port is extracted.
625
626 Argument:
627 address the address, with possible port on the end
628
629 Returns: the port, or zero if there isn't one
630 bombs out on a syntax error
631 */
632
633 static int
634 check_port(uschar *address)
635 {
636 int port = host_address_extract_port(address);
637 if (string_is_ip_address(address, NULL) == 0)
638 {
639 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
640 exit(EXIT_FAILURE);
641 }
642 return port;
643 }
644
645
646
647 /*************************************************
648 * Test/verify an address *
649 *************************************************/
650
651 /* This function is called by the -bv and -bt code. It extracts a working
652 address from a full RFC 822 address. This isn't really necessary per se, but it
653 has the effect of collapsing source routes.
654
655 Arguments:
656 s the address string
657 flags flag bits for verify_address()
658 exit_value to be set for failures
659
660 Returns: nothing
661 */
662
663 static void
664 test_address(uschar *s, int flags, int *exit_value)
665 {
666 int start, end, domain;
667 uschar *parse_error = NULL;
668 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
669 FALSE);
670 if (address == NULL)
671 {
672 fprintf(stdout, "syntax error: %s\n", parse_error);
673 *exit_value = 2;
674 }
675 else
676 {
677 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
678 -1, -1, NULL, NULL, NULL);
679 if (rc == FAIL) *exit_value = 2;
680 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
681 }
682 }
683
684
685
686 /*************************************************
687 * Show supported features *
688 *************************************************/
689
690 /* This function is called for -bV/--version and for -d to output the optional
691 features of the current Exim binary.
692
693 Arguments: a FILE for printing
694 Returns: nothing
695 */
696
697 static void
698 show_whats_supported(FILE *f)
699 {
700 #ifdef DB_VERSION_STRING
701 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
702 #elif defined(BTREEVERSION) && defined(HASHVERSION)
703 #ifdef USE_DB
704 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
705 #else
706 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
707 #endif
708 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
709 fprintf(f, "Probably ndbm\n");
710 #elif defined(USE_TDB)
711 fprintf(f, "Using tdb\n");
712 #else
713 #ifdef USE_GDBM
714 fprintf(f, "Probably GDBM (native mode)\n");
715 #else
716 fprintf(f, "Probably GDBM (compatibility mode)\n");
717 #endif
718 #endif
719
720 fprintf(f, "Support for:");
721 #ifdef SUPPORT_CRYPTEQ
722 fprintf(f, " crypteq");
723 #endif
724 #if HAVE_ICONV
725 fprintf(f, " iconv()");
726 #endif
727 #if HAVE_IPV6
728 fprintf(f, " IPv6");
729 #endif
730 #ifdef HAVE_SETCLASSRESOURCES
731 fprintf(f, " use_setclassresources");
732 #endif
733 #ifdef SUPPORT_PAM
734 fprintf(f, " PAM");
735 #endif
736 #ifdef EXIM_PERL
737 fprintf(f, " Perl");
738 #endif
739 #ifdef EXPAND_DLFUNC
740 fprintf(f, " Expand_dlfunc");
741 #endif
742 #ifdef USE_TCP_WRAPPERS
743 fprintf(f, " TCPwrappers");
744 #endif
745 #ifdef SUPPORT_TLS
746 #ifdef USE_GNUTLS
747 fprintf(f, " GnuTLS");
748 #else
749 fprintf(f, " OpenSSL");
750 #endif
751 #endif
752 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
753 fprintf(f, " translate_ip_address");
754 #endif
755 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
756 fprintf(f, " move_frozen_messages");
757 #endif
758 #ifdef WITH_CONTENT_SCAN
759 fprintf(f, " Content_Scanning");
760 #endif
761 #ifndef DISABLE_DKIM
762 fprintf(f, " DKIM");
763 #endif
764 #ifdef WITH_OLD_DEMIME
765 fprintf(f, " Old_Demime");
766 #endif
767 #ifdef EXPERIMENTAL_SPF
768 fprintf(f, " Experimental_SPF");
769 #endif
770 #ifdef EXPERIMENTAL_SRS
771 fprintf(f, " Experimental_SRS");
772 #endif
773 #ifdef EXPERIMENTAL_BRIGHTMAIL
774 fprintf(f, " Experimental_Brightmail");
775 #endif
776 #ifdef EXPERIMENTAL_DCC
777 fprintf(f, " Experimental_DCC");
778 #endif
779 fprintf(f, "\n");
780
781 fprintf(f, "Lookups (built-in):");
782 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
783 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
784 #endif
785 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
786 fprintf(f, " cdb");
787 #endif
788 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
789 fprintf(f, " dbm dbmnz");
790 #endif
791 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
792 fprintf(f, " dnsdb");
793 #endif
794 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
795 fprintf(f, " dsearch");
796 #endif
797 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
798 fprintf(f, " ibase");
799 #endif
800 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
801 fprintf(f, " ldap ldapdn ldapm");
802 #endif
803 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
804 fprintf(f, " mysql");
805 #endif
806 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
807 fprintf(f, " nis nis0");
808 #endif
809 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
810 fprintf(f, " nisplus");
811 #endif
812 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
813 fprintf(f, " oracle");
814 #endif
815 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
816 fprintf(f, " passwd");
817 #endif
818 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
819 fprintf(f, " pgsql");
820 #endif
821 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
822 fprintf(f, " sqlite");
823 #endif
824 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
825 fprintf(f, " testdb");
826 #endif
827 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
828 fprintf(f, " whoson");
829 #endif
830 fprintf(f, "\n");
831
832 fprintf(f, "Authenticators:");
833 #ifdef AUTH_CRAM_MD5
834 fprintf(f, " cram_md5");
835 #endif
836 #ifdef AUTH_CYRUS_SASL
837 fprintf(f, " cyrus_sasl");
838 #endif
839 #ifdef AUTH_DOVECOT
840 fprintf(f, " dovecot");
841 #endif
842 #ifdef AUTH_PLAINTEXT
843 fprintf(f, " plaintext");
844 #endif
845 #ifdef AUTH_SPA
846 fprintf(f, " spa");
847 #endif
848 fprintf(f, "\n");
849
850 fprintf(f, "Routers:");
851 #ifdef ROUTER_ACCEPT
852 fprintf(f, " accept");
853 #endif
854 #ifdef ROUTER_DNSLOOKUP
855 fprintf(f, " dnslookup");
856 #endif
857 #ifdef ROUTER_IPLITERAL
858 fprintf(f, " ipliteral");
859 #endif
860 #ifdef ROUTER_IPLOOKUP
861 fprintf(f, " iplookup");
862 #endif
863 #ifdef ROUTER_MANUALROUTE
864 fprintf(f, " manualroute");
865 #endif
866 #ifdef ROUTER_QUERYPROGRAM
867 fprintf(f, " queryprogram");
868 #endif
869 #ifdef ROUTER_REDIRECT
870 fprintf(f, " redirect");
871 #endif
872 fprintf(f, "\n");
873
874 fprintf(f, "Transports:");
875 #ifdef TRANSPORT_APPENDFILE
876 fprintf(f, " appendfile");
877 #ifdef SUPPORT_MAILDIR
878 fprintf(f, "/maildir");
879 #endif
880 #ifdef SUPPORT_MAILSTORE
881 fprintf(f, "/mailstore");
882 #endif
883 #ifdef SUPPORT_MBX
884 fprintf(f, "/mbx");
885 #endif
886 #endif
887 #ifdef TRANSPORT_AUTOREPLY
888 fprintf(f, " autoreply");
889 #endif
890 #ifdef TRANSPORT_LMTP
891 fprintf(f, " lmtp");
892 #endif
893 #ifdef TRANSPORT_PIPE
894 fprintf(f, " pipe");
895 #endif
896 #ifdef TRANSPORT_SMTP
897 fprintf(f, " smtp");
898 #endif
899 fprintf(f, "\n");
900
901 if (fixed_never_users[0] > 0)
902 {
903 int i;
904 fprintf(f, "Fixed never_users: ");
905 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
906 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
907 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
908 }
909
910 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
911
912 /* This runtime check is to help diagnose library linkage mismatches which
913 result in segfaults and the like; as such, it's left until the end,
914 just in case. There will still be a "Configuration file is" line still to
915 come. */
916 #ifdef SUPPORT_TLS
917 tls_version_report(f);
918 #endif
919
920 /* Everything else is details which are only worth reporting when debugging.
921 Perhaps the tls_version_report should move into this too. */
922 DEBUG(D_any) do {
923
924 int i;
925
926 #ifdef AUTH_CYRUS_SASL
927 auth_cyrus_sasl_version_report(f);
928 #endif
929
930 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
931 " Runtime: %s\n",
932 PCRE_MAJOR, PCRE_MINOR,
933 /* PRE_PRERELEASE is either defined and empty or a string.
934 * This should work: */
935 PCRE_PRERELEASE "",
936 pcre_version());
937
938 init_lookup_list();
939 for (i = 0; i < lookup_list_count; i++)
940 {
941 if (lookup_list[i]->version_report)
942 lookup_list[i]->version_report(f);
943 }
944
945 } while (0);
946 }
947
948
949
950
951 /*************************************************
952 * Quote a local part *
953 *************************************************/
954
955 /* This function is used when a sender address or a From: or Sender: header
956 line is being created from the caller's login, or from an authenticated_id. It
957 applies appropriate quoting rules for a local part.
958
959 Argument: the local part
960 Returns: the local part, quoted if necessary
961 */
962
963 uschar *
964 local_part_quote(uschar *lpart)
965 {
966 BOOL needs_quote = FALSE;
967 int size, ptr;
968 uschar *yield;
969 uschar *t;
970
971 for (t = lpart; !needs_quote && *t != 0; t++)
972 {
973 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
974 (*t != '.' || t == lpart || t[1] == 0);
975 }
976
977 if (!needs_quote) return lpart;
978
979 size = ptr = 0;
980 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
981
982 for (;;)
983 {
984 uschar *nq = US Ustrpbrk(lpart, "\\\"");
985 if (nq == NULL)
986 {
987 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
988 break;
989 }
990 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
991 yield = string_cat(yield, &size, &ptr, US"\\", 1);
992 yield = string_cat(yield, &size, &ptr, nq, 1);
993 lpart = nq + 1;
994 }
995
996 yield = string_cat(yield, &size, &ptr, US"\"", 1);
997 yield[ptr] = 0;
998 return yield;
999 }
1000
1001
1002
1003 #ifdef USE_READLINE
1004 /*************************************************
1005 * Load readline() functions *
1006 *************************************************/
1007
1008 /* This function is called from testing executions that read data from stdin,
1009 but only when running as the calling user. Currently, only -be does this. The
1010 function loads the readline() function library and passes back the functions.
1011 On some systems, it needs the curses library, so load that too, but try without
1012 it if loading fails. All this functionality has to be requested at build time.
1013
1014 Arguments:
1015 fn_readline_ptr pointer to where to put the readline pointer
1016 fn_addhist_ptr pointer to where to put the addhistory function
1017
1018 Returns: the dlopen handle or NULL on failure
1019 */
1020
1021 static void *
1022 set_readline(char * (**fn_readline_ptr)(char *),
1023 char * (**fn_addhist_ptr)(char *))
1024 {
1025 void *dlhandle;
1026 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1027
1028 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1029 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1030
1031 if (dlhandle != NULL)
1032 {
1033 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1034 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1035 }
1036 else
1037 {
1038 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1039 }
1040
1041 return dlhandle;
1042 }
1043 #endif
1044
1045
1046
1047 /*************************************************
1048 * Get a line from stdin for testing things *
1049 *************************************************/
1050
1051 /* This function is called when running tests that can take a number of lines
1052 of input (for example, -be and -bt). It handles continuations and trailing
1053 spaces. And prompting and a blank line output on eof. If readline() is in use,
1054 the arguments are non-NULL and provide the relevant functions.
1055
1056 Arguments:
1057 fn_readline readline function or NULL
1058 fn_addhist addhist function or NULL
1059
1060 Returns: pointer to dynamic memory, or NULL at end of file
1061 */
1062
1063 static uschar *
1064 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1065 {
1066 int i;
1067 int size = 0;
1068 int ptr = 0;
1069 uschar *yield = NULL;
1070
1071 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1072
1073 for (i = 0;; i++)
1074 {
1075 uschar buffer[1024];
1076 uschar *p, *ss;
1077
1078 #ifdef USE_READLINE
1079 char *readline_line = NULL;
1080 if (fn_readline != NULL)
1081 {
1082 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1083 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1084 p = US readline_line;
1085 }
1086 else
1087 #endif
1088
1089 /* readline() not in use */
1090
1091 {
1092 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1093 p = buffer;
1094 }
1095
1096 /* Handle the line */
1097
1098 ss = p + (int)Ustrlen(p);
1099 while (ss > p && isspace(ss[-1])) ss--;
1100
1101 if (i > 0)
1102 {
1103 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1104 }
1105
1106 yield = string_cat(yield, &size, &ptr, p, ss - p);
1107
1108 #ifdef USE_READLINE
1109 if (fn_readline != NULL) free(readline_line);
1110 #endif
1111
1112 if (ss == p || yield[ptr-1] != '\\')
1113 {
1114 yield[ptr] = 0;
1115 break;
1116 }
1117 yield[--ptr] = 0;
1118 }
1119
1120 if (yield == NULL) printf("\n");
1121 return yield;
1122 }
1123
1124
1125
1126 /*************************************************
1127 * Output usage information for the program *
1128 *************************************************/
1129
1130 /* This function is called when there are no recipients
1131 or a specific --help argument was added.
1132
1133 Arguments:
1134 progname information on what name we were called by
1135
1136 Returns: DOES NOT RETURN
1137 */
1138
1139 static void
1140 exim_usage(uschar *progname)
1141 {
1142
1143 /* Handle specific program invocation varients */
1144 if (Ustrcmp(progname, US"-mailq") == 0)
1145 {
1146 fprintf(stderr,
1147 "mailq - list the contents of the mail queue\n\n"
1148 "For a list of options, see the Exim documentation.\n");
1149 exit(EXIT_FAILURE);
1150 }
1151
1152 /* Generic usage - we output this whatever happens */
1153 fprintf(stderr,
1154 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1155 "not directly from a shell command line. Options and/or arguments control\n"
1156 "what it does when called. For a list of options, see the Exim documentation.\n");
1157
1158 exit(EXIT_FAILURE);
1159 }
1160
1161
1162
1163 /*************************************************
1164 * Validate that the macros given are okay *
1165 *************************************************/
1166
1167 /* Typically, Exim will drop privileges if macros are supplied. In some
1168 cases, we want to not do so.
1169
1170 Arguments: none (macros is a global)
1171 Returns: true if trusted, false otherwise
1172 */
1173
1174 static BOOL
1175 macros_trusted(void)
1176 {
1177 #ifdef WHITELIST_D_MACROS
1178 macro_item *m;
1179 uschar *whitelisted, *end, *p, **whites, **w;
1180 int white_count, i, n;
1181 size_t len;
1182 BOOL prev_char_item, found;
1183 #endif
1184
1185 if (macros == NULL)
1186 return TRUE;
1187 #ifndef WHITELIST_D_MACROS
1188 return FALSE;
1189 #else
1190
1191 /* We only trust -D overrides for some invoking users:
1192 root, the exim run-time user, the optional config owner user.
1193 I don't know why config-owner would be needed, but since they can own the
1194 config files anyway, there's no security risk to letting them override -D. */
1195 if ( ! ((real_uid == root_uid)
1196 || (real_uid == exim_uid)
1197 #ifdef CONFIGURE_OWNER
1198 || (real_uid == config_uid)
1199 #endif
1200 ))
1201 {
1202 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1203 return FALSE;
1204 }
1205
1206 /* Get a list of macros which are whitelisted */
1207 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1208 prev_char_item = FALSE;
1209 white_count = 0;
1210 for (p = whitelisted; *p != '\0'; ++p)
1211 {
1212 if (*p == ':' || isspace(*p))
1213 {
1214 *p = '\0';
1215 if (prev_char_item)
1216 ++white_count;
1217 prev_char_item = FALSE;
1218 continue;
1219 }
1220 if (!prev_char_item)
1221 prev_char_item = TRUE;
1222 }
1223 end = p;
1224 if (prev_char_item)
1225 ++white_count;
1226 if (!white_count)
1227 return FALSE;
1228 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1229 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1230 {
1231 if (*p != '\0')
1232 {
1233 whites[i++] = p;
1234 if (i == white_count)
1235 break;
1236 while (*p != '\0' && p < end)
1237 ++p;
1238 }
1239 }
1240 whites[i] = NULL;
1241
1242 /* The list of macros should be very short. Accept the N*M complexity. */
1243 for (m = macros; m != NULL; m = m->next)
1244 {
1245 found = FALSE;
1246 for (w = whites; *w; ++w)
1247 if (Ustrcmp(*w, m->name) == 0)
1248 {
1249 found = TRUE;
1250 break;
1251 }
1252 if (!found)
1253 return FALSE;
1254 if (m->replacement == NULL)
1255 continue;
1256 len = Ustrlen(m->replacement);
1257 if (len == 0)
1258 continue;
1259 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1260 0, PCRE_EOPT, NULL, 0);
1261 if (n < 0)
1262 {
1263 if (n != PCRE_ERROR_NOMATCH)
1264 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1265 return FALSE;
1266 }
1267 }
1268 debug_printf("macros_trusted overriden to true by whitelisting\n");
1269 return TRUE;
1270 #endif
1271 }
1272
1273
1274 /*************************************************
1275 * Entry point and high-level code *
1276 *************************************************/
1277
1278 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1279 the appropriate action. All the necessary functions are present in the one
1280 binary. I originally thought one should split it up, but it turns out that so
1281 much of the apparatus is needed in each chunk that one might as well just have
1282 it all available all the time, which then makes the coding easier as well.
1283
1284 Arguments:
1285 argc count of entries in argv
1286 argv argument strings, with argv[0] being the program name
1287
1288 Returns: EXIT_SUCCESS if terminated successfully
1289 EXIT_FAILURE otherwise, except when a message has been sent
1290 to the sender, and -oee was given
1291 */
1292
1293 int
1294 main(int argc, char **cargv)
1295 {
1296 uschar **argv = USS cargv;
1297 int arg_receive_timeout = -1;
1298 int arg_smtp_receive_timeout = -1;
1299 int arg_error_handling = error_handling;
1300 int filter_sfd = -1;
1301 int filter_ufd = -1;
1302 int group_count;
1303 int i, rv;
1304 int list_queue_option = 0;
1305 int msg_action = 0;
1306 int msg_action_arg = -1;
1307 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1308 int queue_only_reason = 0;
1309 #ifdef EXIM_PERL
1310 int perl_start_option = 0;
1311 #endif
1312 int recipients_arg = argc;
1313 int sender_address_domain = 0;
1314 int test_retry_arg = -1;
1315 int test_rewrite_arg = -1;
1316 BOOL arg_queue_only = FALSE;
1317 BOOL bi_option = FALSE;
1318 BOOL checking = FALSE;
1319 BOOL count_queue = FALSE;
1320 BOOL expansion_test = FALSE;
1321 BOOL extract_recipients = FALSE;
1322 BOOL forced_delivery = FALSE;
1323 BOOL f_end_dot = FALSE;
1324 BOOL deliver_give_up = FALSE;
1325 BOOL list_queue = FALSE;
1326 BOOL list_options = FALSE;
1327 BOOL local_queue_only;
1328 BOOL more = TRUE;
1329 BOOL one_msg_action = FALSE;
1330 BOOL queue_only_set = FALSE;
1331 BOOL receiving_message = TRUE;
1332 BOOL sender_ident_set = FALSE;
1333 BOOL session_local_queue_only;
1334 BOOL unprivileged;
1335 BOOL removed_privilege = FALSE;
1336 BOOL usage_wanted = FALSE;
1337 BOOL verify_address_mode = FALSE;
1338 BOOL verify_as_sender = FALSE;
1339 BOOL version_printed = FALSE;
1340 uschar *alias_arg = NULL;
1341 uschar *called_as = US"";
1342 uschar *start_queue_run_id = NULL;
1343 uschar *stop_queue_run_id = NULL;
1344 uschar *expansion_test_message = NULL;
1345 uschar *ftest_domain = NULL;
1346 uschar *ftest_localpart = NULL;
1347 uschar *ftest_prefix = NULL;
1348 uschar *ftest_suffix = NULL;
1349 uschar *malware_test_file = NULL;
1350 uschar *real_sender_address;
1351 uschar *originator_home = US"/";
1352 void *reset_point;
1353
1354 struct passwd *pw;
1355 struct stat statbuf;
1356 pid_t passed_qr_pid = (pid_t)0;
1357 int passed_qr_pipe = -1;
1358 gid_t group_list[NGROUPS_MAX];
1359
1360 /* Possible options for -R and -S */
1361
1362 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1363
1364 /* Need to define this in case we need to change the environment in order
1365 to get rid of a bogus time zone. We have to make it char rather than uschar
1366 because some OS define it in /usr/include/unistd.h. */
1367
1368 extern char **environ;
1369
1370 /* If the Exim user and/or group and/or the configuration file owner/group were
1371 defined by ref:name at build time, we must now find the actual uid/gid values.
1372 This is a feature to make the lives of binary distributors easier. */
1373
1374 #ifdef EXIM_USERNAME
1375 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1376 {
1377 if (exim_uid == 0)
1378 {
1379 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1380 EXIM_USERNAME);
1381 exit(EXIT_FAILURE);
1382 }
1383 exim_gid = pw->pw_gid;
1384 }
1385 else
1386 {
1387 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1388 EXIM_USERNAME);
1389 exit(EXIT_FAILURE);
1390 }
1391 #endif
1392
1393 #ifdef EXIM_GROUPNAME
1394 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1395 {
1396 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1397 EXIM_GROUPNAME);
1398 exit(EXIT_FAILURE);
1399 }
1400 #endif
1401
1402 #ifdef CONFIGURE_OWNERNAME
1403 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1404 {
1405 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1406 CONFIGURE_OWNERNAME);
1407 exit(EXIT_FAILURE);
1408 }
1409 #endif
1410
1411 /* We default the system_filter_user to be the Exim run-time user, as a
1412 sane non-root value. */
1413 system_filter_uid = exim_uid;
1414
1415 #ifdef CONFIGURE_GROUPNAME
1416 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1417 {
1418 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1419 CONFIGURE_GROUPNAME);
1420 exit(EXIT_FAILURE);
1421 }
1422 #endif
1423
1424 /* In the Cygwin environment, some initialization needs doing. It is fudged
1425 in by means of this macro. */
1426
1427 #ifdef OS_INIT
1428 OS_INIT
1429 #endif
1430
1431 /* Check a field which is patched when we are running Exim within its
1432 testing harness; do a fast initial check, and then the whole thing. */
1433
1434 running_in_test_harness =
1435 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1436
1437 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1438 at the start of a program; however, it seems that some environments do not
1439 follow this. A "strange" locale can affect the formatting of timestamps, so we
1440 make quite sure. */
1441
1442 setlocale(LC_ALL, "C");
1443
1444 /* Set up the default handler for timing using alarm(). */
1445
1446 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1447
1448 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1449 because store_malloc writes a log entry on failure. */
1450
1451 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1452 if (log_buffer == NULL)
1453 {
1454 fprintf(stderr, "exim: failed to get store for log buffer\n");
1455 exit(EXIT_FAILURE);
1456 }
1457
1458 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1459 NULL when the daemon is run and the file is closed. We have to use this
1460 indirection, because some systems don't allow writing to the variable "stderr".
1461 */
1462
1463 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1464
1465 /* Arrange for the PCRE regex library to use our store functions. Note that
1466 the normal calls are actually macros that add additional arguments for
1467 debugging purposes so we have to assign specially constructed functions here.
1468 The default is to use store in the stacking pool, but this is overridden in the
1469 regex_must_compile() function. */
1470
1471 pcre_malloc = function_store_get;
1472 pcre_free = function_dummy_free;
1473
1474 /* Ensure there is a big buffer for temporary use in several places. It is put
1475 in malloc store so that it can be freed for enlargement if necessary. */
1476
1477 big_buffer = store_malloc(big_buffer_size);
1478
1479 /* Set up the handler for the data request signal, and set the initial
1480 descriptive text. */
1481
1482 set_process_info("initializing");
1483 os_restarting_signal(SIGUSR1, usr1_handler);
1484
1485 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1486 in the daemon code. For the rest of Exim's uses, we ignore it. */
1487
1488 signal(SIGHUP, SIG_IGN);
1489
1490 /* We don't want to die on pipe errors as the code is written to handle
1491 the write error instead. */
1492
1493 signal(SIGPIPE, SIG_IGN);
1494
1495 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1496 set to SIG_IGN. This causes subprocesses that complete before the parent
1497 process waits for them not to hang around, so when Exim calls wait(), nothing
1498 is there. The wait() code has been made robust against this, but let's ensure
1499 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1500 ending status. We use sigaction rather than plain signal() on those OS where
1501 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1502 problem on AIX with this.) */
1503
1504 #ifdef SA_NOCLDWAIT
1505 {
1506 struct sigaction act;
1507 act.sa_handler = SIG_DFL;
1508 sigemptyset(&(act.sa_mask));
1509 act.sa_flags = 0;
1510 sigaction(SIGCHLD, &act, NULL);
1511 }
1512 #else
1513 signal(SIGCHLD, SIG_DFL);
1514 #endif
1515
1516 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1517 SIGHUP. */
1518
1519 sighup_argv = argv;
1520
1521 /* Set up the version number. Set up the leading 'E' for the external form of
1522 message ids, set the pointer to the internal form, and initialize it to
1523 indicate no message being processed. */
1524
1525 version_init();
1526 message_id_option[0] = '-';
1527 message_id_external = message_id_option + 1;
1528 message_id_external[0] = 'E';
1529 message_id = message_id_external + 1;
1530 message_id[0] = 0;
1531
1532 /* Set the umask to zero so that any files Exim creates using open() are
1533 created with the modes that it specifies. NOTE: Files created with fopen() have
1534 a problem, which was not recognized till rather late (February 2006). With this
1535 umask, such files will be world writeable. (They are all content scanning files
1536 in the spool directory, which isn't world-accessible, so this is not a
1537 disaster, but it's untidy.) I don't want to change this overall setting,
1538 however, because it will interact badly with the open() calls. Instead, there's
1539 now a function called modefopen() that fiddles with the umask while calling
1540 fopen(). */
1541
1542 (void)umask(0);
1543
1544 /* Precompile the regular expression for matching a message id. Keep this in
1545 step with the code that generates ids in the accept.c module. We need to do
1546 this here, because the -M options check their arguments for syntactic validity
1547 using mac_ismsgid, which uses this. */
1548
1549 regex_ismsgid =
1550 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1551
1552 /* Precompile the regular expression that is used for matching an SMTP error
1553 code, possibly extended, at the start of an error message. Note that the
1554 terminating whitespace character is included. */
1555
1556 regex_smtp_code =
1557 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1558 FALSE, TRUE);
1559
1560 #ifdef WHITELIST_D_MACROS
1561 /* Precompile the regular expression used to filter the content of macros
1562 given to -D for permissibility. */
1563
1564 regex_whitelisted_macro =
1565 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1566 #endif
1567
1568
1569 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1570 this seems to be a generally accepted convention, since one finds symbolic
1571 links called "mailq" in standard OS configurations. */
1572
1573 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1574 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1575 {
1576 list_queue = TRUE;
1577 receiving_message = FALSE;
1578 called_as = US"-mailq";
1579 }
1580
1581 /* If the program is called as "rmail" treat it as equivalent to
1582 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1583 i.e. preventing a single dot on a line from terminating the message, and
1584 returning with zero return code, even in cases of error (provided an error
1585 message has been sent). */
1586
1587 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1588 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1589 {
1590 dot_ends = FALSE;
1591 called_as = US"-rmail";
1592 errors_sender_rc = EXIT_SUCCESS;
1593 }
1594
1595 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1596 this is a smail convention. */
1597
1598 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1599 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1600 {
1601 smtp_input = smtp_batched_input = TRUE;
1602 called_as = US"-rsmtp";
1603 }
1604
1605 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1606 this is a smail convention. */
1607
1608 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1609 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1610 {
1611 queue_interval = 0;
1612 receiving_message = FALSE;
1613 called_as = US"-runq";
1614 }
1615
1616 /* If the program is called as "newaliases" treat it as equivalent to
1617 "exim -bi"; this is a sendmail convention. */
1618
1619 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1620 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1621 {
1622 bi_option = TRUE;
1623 receiving_message = FALSE;
1624 called_as = US"-newaliases";
1625 }
1626
1627 /* Save the original effective uid for a couple of uses later. It should
1628 normally be root, but in some esoteric environments it may not be. */
1629
1630 original_euid = geteuid();
1631
1632 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1633 to be the same as the real ones. This makes a difference only if Exim is setuid
1634 (or setgid) to something other than root, which could be the case in some
1635 special configurations. */
1636
1637 real_uid = getuid();
1638 real_gid = getgid();
1639
1640 if (real_uid == root_uid)
1641 {
1642 rv = setgid(real_gid);
1643 if (rv)
1644 {
1645 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1646 (long int)real_gid, strerror(errno));
1647 exit(EXIT_FAILURE);
1648 }
1649 rv = setuid(real_uid);
1650 if (rv)
1651 {
1652 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1653 (long int)real_uid, strerror(errno));
1654 exit(EXIT_FAILURE);
1655 }
1656 }
1657
1658 /* If neither the original real uid nor the original euid was root, Exim is
1659 running in an unprivileged state. */
1660
1661 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1662
1663 /* Scan the program's arguments. Some can be dealt with right away; others are
1664 simply recorded for checking and handling afterwards. Do a high-level switch
1665 on the second character (the one after '-'), to save some effort. */
1666
1667 for (i = 1; i < argc; i++)
1668 {
1669 BOOL badarg = FALSE;
1670 uschar *arg = argv[i];
1671 uschar *argrest;
1672 int switchchar;
1673
1674 /* An argument not starting with '-' is the start of a recipients list;
1675 break out of the options-scanning loop. */
1676
1677 if (arg[0] != '-')
1678 {
1679 recipients_arg = i;
1680 break;
1681 }
1682
1683 /* An option consistion of -- terminates the options */
1684
1685 if (Ustrcmp(arg, "--") == 0)
1686 {
1687 recipients_arg = i + 1;
1688 break;
1689 }
1690
1691 /* Handle flagged options */
1692
1693 switchchar = arg[1];
1694 argrest = arg+2;
1695
1696 /* Make all -ex options synonymous with -oex arguments, since that
1697 is assumed by various callers. Also make -qR options synonymous with -R
1698 options, as that seems to be required as well. Allow for -qqR too, and
1699 the same for -S options. */
1700
1701 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1702 Ustrncmp(arg+1, "qR", 2) == 0 ||
1703 Ustrncmp(arg+1, "qS", 2) == 0)
1704 {
1705 switchchar = arg[2];
1706 argrest++;
1707 }
1708 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1709 {
1710 switchchar = arg[3];
1711 argrest += 2;
1712 queue_2stage = TRUE;
1713 }
1714
1715 /* Make -r synonymous with -f, since it is a documented alias */
1716
1717 else if (arg[1] == 'r') switchchar = 'f';
1718
1719 /* Make -ov synonymous with -v */
1720
1721 else if (Ustrcmp(arg, "-ov") == 0)
1722 {
1723 switchchar = 'v';
1724 argrest++;
1725 }
1726
1727 /* deal with --option_aliases */
1728 else if (switchchar == '-')
1729 {
1730 if (Ustrcmp(argrest, "help") == 0)
1731 {
1732 usage_wanted = TRUE;
1733 break;
1734 }
1735 else if (Ustrcmp(argrest, "version") == 0)
1736 {
1737 switchchar = 'b';
1738 argrest = US"V";
1739 }
1740 }
1741
1742 /* High-level switch on active initial letter */
1743
1744 switch(switchchar)
1745 {
1746 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1747 so has no need of it. */
1748
1749 case 'B':
1750 if (*argrest == 0) i++; /* Skip over the type */
1751 break;
1752
1753
1754 case 'b':
1755 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1756
1757 /* -bd: Run in daemon mode, awaiting SMTP connections.
1758 -bdf: Ditto, but in the foreground.
1759 */
1760
1761 if (*argrest == 'd')
1762 {
1763 daemon_listen = TRUE;
1764 if (*(++argrest) == 'f') background_daemon = FALSE;
1765 else if (*argrest != 0) { badarg = TRUE; break; }
1766 }
1767
1768 /* -be: Run in expansion test mode
1769 -bem: Ditto, but read a message from a file first
1770 */
1771
1772 else if (*argrest == 'e')
1773 {
1774 expansion_test = checking = TRUE;
1775 if (argrest[1] == 'm')
1776 {
1777 if (++i >= argc) { badarg = TRUE; break; }
1778 expansion_test_message = argv[i];
1779 argrest++;
1780 }
1781 if (argrest[1] != 0) { badarg = TRUE; break; }
1782 }
1783
1784 /* -bF: Run system filter test */
1785
1786 else if (*argrest == 'F')
1787 {
1788 filter_test |= FTEST_SYSTEM;
1789 if (*(++argrest) != 0) { badarg = TRUE; break; }
1790 if (++i < argc) filter_test_sfile = argv[i]; else
1791 {
1792 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1793 exit(EXIT_FAILURE);
1794 }
1795 }
1796
1797 /* -bf: Run user filter test
1798 -bfd: Set domain for filter testing
1799 -bfl: Set local part for filter testing
1800 -bfp: Set prefix for filter testing
1801 -bfs: Set suffix for filter testing
1802 */
1803
1804 else if (*argrest == 'f')
1805 {
1806 if (*(++argrest) == 0)
1807 {
1808 filter_test |= FTEST_USER;
1809 if (++i < argc) filter_test_ufile = argv[i]; else
1810 {
1811 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1812 exit(EXIT_FAILURE);
1813 }
1814 }
1815 else
1816 {
1817 if (++i >= argc)
1818 {
1819 fprintf(stderr, "exim: string expected after %s\n", arg);
1820 exit(EXIT_FAILURE);
1821 }
1822 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1823 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1824 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1825 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1826 else { badarg = TRUE; break; }
1827 }
1828 }
1829
1830 /* -bh: Host checking - an IP address must follow. */
1831
1832 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1833 {
1834 if (++i >= argc) { badarg = TRUE; break; }
1835 sender_host_address = argv[i];
1836 host_checking = checking = log_testing_mode = TRUE;
1837 host_checking_callout = argrest[1] == 'c';
1838 }
1839
1840 /* -bi: This option is used by sendmail to initialize *the* alias file,
1841 though it has the -oA option to specify a different file. Exim has no
1842 concept of *the* alias file, but since Sun's YP make script calls
1843 sendmail this way, some support must be provided. */
1844
1845 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1846
1847 /* -bm: Accept and deliver message - the default option. Reinstate
1848 receiving_message, which got turned off for all -b options. */
1849
1850 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1851
1852 /* -bmalware: test the filename given for malware */
1853
1854 else if (Ustrcmp(argrest, "malware") == 0)
1855 {
1856 if (++i >= argc) { badarg = TRUE; break; }
1857 malware_test_file = argv[i];
1858 }
1859
1860 /* -bnq: For locally originating messages, do not qualify unqualified
1861 addresses. In the envelope, this causes errors; in header lines they
1862 just get left. */
1863
1864 else if (Ustrcmp(argrest, "nq") == 0)
1865 {
1866 allow_unqualified_sender = FALSE;
1867 allow_unqualified_recipient = FALSE;
1868 }
1869
1870 /* -bpxx: List the contents of the mail queue, in various forms. If
1871 the option is -bpc, just a queue count is needed. Otherwise, if the
1872 first letter after p is r, then order is random. */
1873
1874 else if (*argrest == 'p')
1875 {
1876 if (*(++argrest) == 'c')
1877 {
1878 count_queue = TRUE;
1879 if (*(++argrest) != 0) badarg = TRUE;
1880 break;
1881 }
1882
1883 if (*argrest == 'r')
1884 {
1885 list_queue_option = 8;
1886 argrest++;
1887 }
1888 else list_queue_option = 0;
1889
1890 list_queue = TRUE;
1891
1892 /* -bp: List the contents of the mail queue, top-level only */
1893
1894 if (*argrest == 0) {}
1895
1896 /* -bpu: List the contents of the mail queue, top-level undelivered */
1897
1898 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1899
1900 /* -bpa: List the contents of the mail queue, including all delivered */
1901
1902 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1903
1904 /* Unknown after -bp[r] */
1905
1906 else
1907 {
1908 badarg = TRUE;
1909 break;
1910 }
1911 }
1912
1913
1914 /* -bP: List the configuration variables given as the address list.
1915 Force -v, so configuration errors get displayed. */
1916
1917 else if (Ustrcmp(argrest, "P") == 0)
1918 {
1919 list_options = TRUE;
1920 debug_selector |= D_v;
1921 debug_file = stderr;
1922 }
1923
1924 /* -brt: Test retry configuration lookup */
1925
1926 else if (Ustrcmp(argrest, "rt") == 0)
1927 {
1928 test_retry_arg = i + 1;
1929 goto END_ARG;
1930 }
1931
1932 /* -brw: Test rewrite configuration */
1933
1934 else if (Ustrcmp(argrest, "rw") == 0)
1935 {
1936 test_rewrite_arg = i + 1;
1937 goto END_ARG;
1938 }
1939
1940 /* -bS: Read SMTP commands on standard input, but produce no replies -
1941 all errors are reported by sending messages. */
1942
1943 else if (Ustrcmp(argrest, "S") == 0)
1944 smtp_input = smtp_batched_input = receiving_message = TRUE;
1945
1946 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1947 on standard output. */
1948
1949 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1950
1951 /* -bt: address testing mode */
1952
1953 else if (Ustrcmp(argrest, "t") == 0)
1954 address_test_mode = checking = log_testing_mode = TRUE;
1955
1956 /* -bv: verify addresses */
1957
1958 else if (Ustrcmp(argrest, "v") == 0)
1959 verify_address_mode = checking = log_testing_mode = TRUE;
1960
1961 /* -bvs: verify sender addresses */
1962
1963 else if (Ustrcmp(argrest, "vs") == 0)
1964 {
1965 verify_address_mode = checking = log_testing_mode = TRUE;
1966 verify_as_sender = TRUE;
1967 }
1968
1969 /* -bV: Print version string and support details */
1970
1971 else if (Ustrcmp(argrest, "V") == 0)
1972 {
1973 printf("Exim version %s #%s built %s\n", version_string,
1974 version_cnumber, version_date);
1975 printf("%s\n", CS version_copyright);
1976 version_printed = TRUE;
1977 show_whats_supported(stdout);
1978 }
1979
1980 else badarg = TRUE;
1981 break;
1982
1983
1984 /* -C: change configuration file list; ignore if it isn't really
1985 a change! Enforce a prefix check if required. */
1986
1987 case 'C':
1988 if (*argrest == 0)
1989 {
1990 if(++i < argc) argrest = argv[i]; else
1991 { badarg = TRUE; break; }
1992 }
1993 if (Ustrcmp(config_main_filelist, argrest) != 0)
1994 {
1995 #ifdef ALT_CONFIG_PREFIX
1996 int sep = 0;
1997 int len = Ustrlen(ALT_CONFIG_PREFIX);
1998 uschar *list = argrest;
1999 uschar *filename;
2000 while((filename = string_nextinlist(&list, &sep, big_buffer,
2001 big_buffer_size)) != NULL)
2002 {
2003 if ((Ustrlen(filename) < len ||
2004 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2005 Ustrstr(filename, "/../") != NULL) &&
2006 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2007 {
2008 fprintf(stderr, "-C Permission denied\n");
2009 exit(EXIT_FAILURE);
2010 }
2011 }
2012 #endif
2013 if (real_uid != root_uid)
2014 {
2015 #ifdef TRUSTED_CONFIG_LIST
2016
2017 if (real_uid != exim_uid
2018 #ifdef CONFIGURE_OWNER
2019 && real_uid != config_uid
2020 #endif
2021 )
2022 trusted_config = FALSE;
2023 else
2024 {
2025 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2026 if (trust_list)
2027 {
2028 struct stat statbuf;
2029
2030 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2031 (statbuf.st_uid != root_uid /* owner not root */
2032 #ifdef CONFIGURE_OWNER
2033 && statbuf.st_uid != config_uid /* owner not the special one */
2034 #endif
2035 ) || /* or */
2036 (statbuf.st_gid != root_gid /* group not root */
2037 #ifdef CONFIGURE_GROUP
2038 && statbuf.st_gid != config_gid /* group not the special one */
2039 #endif
2040 && (statbuf.st_mode & 020) != 0 /* group writeable */
2041 ) || /* or */
2042 (statbuf.st_mode & 2) != 0) /* world writeable */
2043 {
2044 trusted_config = FALSE;
2045 fclose(trust_list);
2046 }
2047 else
2048 {
2049 /* Well, the trust list at least is up to scratch... */
2050 void *reset_point = store_get(0);
2051 uschar *trusted_configs[32];
2052 int nr_configs = 0;
2053 int i = 0;
2054
2055 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2056 {
2057 uschar *start = big_buffer, *nl;
2058 while (*start && isspace(*start))
2059 start++;
2060 if (*start != '/')
2061 continue;
2062 nl = Ustrchr(start, '\n');
2063 if (nl)
2064 *nl = 0;
2065 trusted_configs[nr_configs++] = string_copy(start);
2066 if (nr_configs == 32)
2067 break;
2068 }
2069 fclose(trust_list);
2070
2071 if (nr_configs)
2072 {
2073 int sep = 0;
2074 uschar *list = argrest;
2075 uschar *filename;
2076 while (trusted_config && (filename = string_nextinlist(&list,
2077 &sep, big_buffer, big_buffer_size)) != NULL)
2078 {
2079 for (i=0; i < nr_configs; i++)
2080 {
2081 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2082 break;
2083 }
2084 if (i == nr_configs)
2085 {
2086 trusted_config = FALSE;
2087 break;
2088 }
2089 }
2090 store_reset(reset_point);
2091 }
2092 else
2093 {
2094 /* No valid prefixes found in trust_list file. */
2095 trusted_config = FALSE;
2096 }
2097 }
2098 }
2099 else
2100 {
2101 /* Could not open trust_list file. */
2102 trusted_config = FALSE;
2103 }
2104 }
2105 #else
2106 /* Not root; don't trust config */
2107 trusted_config = FALSE;
2108 #endif
2109 }
2110
2111 config_main_filelist = argrest;
2112 config_changed = TRUE;
2113 }
2114 break;
2115
2116
2117 /* -D: set up a macro definition */
2118
2119 case 'D':
2120 #ifdef DISABLE_D_OPTION
2121 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2122 exit(EXIT_FAILURE);
2123 #else
2124 {
2125 int ptr = 0;
2126 macro_item *mlast = NULL;
2127 macro_item *m;
2128 uschar name[24];
2129 uschar *s = argrest;
2130
2131 while (isspace(*s)) s++;
2132
2133 if (*s < 'A' || *s > 'Z')
2134 {
2135 fprintf(stderr, "exim: macro name set by -D must start with "
2136 "an upper case letter\n");
2137 exit(EXIT_FAILURE);
2138 }
2139
2140 while (isalnum(*s) || *s == '_')
2141 {
2142 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2143 s++;
2144 }
2145 name[ptr] = 0;
2146 if (ptr == 0) { badarg = TRUE; break; }
2147 while (isspace(*s)) s++;
2148 if (*s != 0)
2149 {
2150 if (*s++ != '=') { badarg = TRUE; break; }
2151 while (isspace(*s)) s++;
2152 }
2153
2154 for (m = macros; m != NULL; m = m->next)
2155 {
2156 if (Ustrcmp(m->name, name) == 0)
2157 {
2158 fprintf(stderr, "exim: duplicated -D in command line\n");
2159 exit(EXIT_FAILURE);
2160 }
2161 mlast = m;
2162 }
2163
2164 m = store_get(sizeof(macro_item) + Ustrlen(name));
2165 m->next = NULL;
2166 m->command_line = TRUE;
2167 if (mlast == NULL) macros = m; else mlast->next = m;
2168 Ustrcpy(m->name, name);
2169 m->replacement = string_copy(s);
2170
2171 if (clmacro_count >= MAX_CLMACROS)
2172 {
2173 fprintf(stderr, "exim: too many -D options on command line\n");
2174 exit(EXIT_FAILURE);
2175 }
2176 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2177 m->replacement);
2178 }
2179 #endif
2180 break;
2181
2182 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2183 The latter is now a no-op, retained for compatibility only. If -dd is used,
2184 debugging subprocesses of the daemon is disabled. */
2185
2186 case 'd':
2187 if (Ustrcmp(argrest, "ropcr") == 0)
2188 {
2189 /* drop_cr = TRUE; */
2190 }
2191
2192 /* Use an intermediate variable so that we don't set debugging while
2193 decoding the debugging bits. */
2194
2195 else
2196 {
2197 unsigned int selector = D_default;
2198 debug_selector = 0;
2199 debug_file = NULL;
2200 if (*argrest == 'd')
2201 {
2202 debug_daemon = TRUE;
2203 argrest++;
2204 }
2205 if (*argrest != 0)
2206 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2207 debug_options_count, US"debug", 0);
2208 debug_selector = selector;
2209 }
2210 break;
2211
2212
2213 /* -E: This is a local error message. This option is not intended for
2214 external use at all, but is not restricted to trusted callers because it
2215 does no harm (just suppresses certain error messages) and if Exim is run
2216 not setuid root it won't always be trusted when it generates error
2217 messages using this option. If there is a message id following -E, point
2218 message_reference at it, for logging. */
2219
2220 case 'E':
2221 local_error_message = TRUE;
2222 if (mac_ismsgid(argrest)) message_reference = argrest;
2223 break;
2224
2225
2226 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2227 option, so it looks as if historically the -oex options are also callable
2228 without the leading -o. So we have to accept them. Before the switch,
2229 anything starting -oe has been converted to -e. Exim does not support all
2230 of the sendmail error options. */
2231
2232 case 'e':
2233 if (Ustrcmp(argrest, "e") == 0)
2234 {
2235 arg_error_handling = ERRORS_SENDER;
2236 errors_sender_rc = EXIT_SUCCESS;
2237 }
2238 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2239 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2240 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2241 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2242 else badarg = TRUE;
2243 break;
2244
2245
2246 /* -F: Set sender's full name, used instead of the gecos entry from
2247 the password file. Since users can usually alter their gecos entries,
2248 there's no security involved in using this instead. The data can follow
2249 the -F or be in the next argument. */
2250
2251 case 'F':
2252 if (*argrest == 0)
2253 {
2254 if(++i < argc) argrest = argv[i]; else
2255 { badarg = TRUE; break; }
2256 }
2257 originator_name = argrest;
2258 sender_name_forced = TRUE;
2259 break;
2260
2261
2262 /* -f: Set sender's address - this value is only actually used if Exim is
2263 run by a trusted user, or if untrusted_set_sender is set and matches the
2264 address, except that the null address can always be set by any user. The
2265 test for this happens later, when the value given here is ignored when not
2266 permitted. For an untrusted user, the actual sender is still put in Sender:
2267 if it doesn't match the From: header (unless no_local_from_check is set).
2268 The data can follow the -f or be in the next argument. The -r switch is an
2269 obsolete form of -f but since there appear to be programs out there that
2270 use anything that sendmail has ever supported, better accept it - the
2271 synonymizing is done before the switch above.
2272
2273 At this stage, we must allow domain literal addresses, because we don't
2274 know what the setting of allow_domain_literals is yet. Ditto for trailing
2275 dots and strip_trailing_dot. */
2276
2277 case 'f':
2278 {
2279 int start, end;
2280 uschar *errmess;
2281 if (*argrest == 0)
2282 {
2283 if (i+1 < argc) argrest = argv[++i]; else
2284 { badarg = TRUE; break; }
2285 }
2286 if (*argrest == 0)
2287 {
2288 sender_address = string_sprintf(""); /* Ensure writeable memory */
2289 }
2290 else
2291 {
2292 uschar *temp = argrest + Ustrlen(argrest) - 1;
2293 while (temp >= argrest && isspace(*temp)) temp--;
2294 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2295 allow_domain_literals = TRUE;
2296 strip_trailing_dot = TRUE;
2297 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2298 &sender_address_domain, TRUE);
2299 allow_domain_literals = FALSE;
2300 strip_trailing_dot = FALSE;
2301 if (sender_address == NULL)
2302 {
2303 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2304 return EXIT_FAILURE;
2305 }
2306 }
2307 sender_address_forced = TRUE;
2308 }
2309 break;
2310
2311 /* This is some Sendmail thing which can be ignored */
2312
2313 case 'G':
2314 break;
2315
2316 /* -h: Set the hop count for an incoming message. Exim does not currently
2317 support this; it always computes it by counting the Received: headers.
2318 To put it in will require a change to the spool header file format. */
2319
2320 case 'h':
2321 if (*argrest == 0)
2322 {
2323 if(++i < argc) argrest = argv[i]; else
2324 { badarg = TRUE; break; }
2325 }
2326 if (!isdigit(*argrest)) badarg = TRUE;
2327 break;
2328
2329
2330 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2331 not to be documented for sendmail but mailx (at least) uses it) */
2332
2333 case 'i':
2334 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2335 break;
2336
2337
2338 case 'M':
2339 receiving_message = FALSE;
2340
2341 /* -MC: continue delivery of another message via an existing open
2342 file descriptor. This option is used for an internal call by the
2343 smtp transport when there is a pending message waiting to go to an
2344 address to which it has got a connection. Five subsequent arguments are
2345 required: transport name, host name, IP address, sequence number, and
2346 message_id. Transports may decline to create new processes if the sequence
2347 number gets too big. The channel is stdin. This (-MC) must be the last
2348 argument. There's a subsequent check that the real-uid is privileged.
2349
2350 If we are running in the test harness. delay for a bit, to let the process
2351 that set this one up complete. This makes for repeatability of the logging,
2352 etc. output. */
2353
2354 if (Ustrcmp(argrest, "C") == 0)
2355 {
2356 union sockaddr_46 interface_sock;
2357 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2358
2359 if (argc != i + 6)
2360 {
2361 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2362 return EXIT_FAILURE;
2363 }
2364
2365 if (msg_action_arg >= 0)
2366 {
2367 fprintf(stderr, "exim: incompatible arguments\n");
2368 return EXIT_FAILURE;
2369 }
2370
2371 continue_transport = argv[++i];
2372 continue_hostname = argv[++i];
2373 continue_host_address = argv[++i];
2374 continue_sequence = Uatoi(argv[++i]);
2375 msg_action = MSG_DELIVER;
2376 msg_action_arg = ++i;
2377 forced_delivery = TRUE;
2378 queue_run_pid = passed_qr_pid;
2379 queue_run_pipe = passed_qr_pipe;
2380
2381 if (!mac_ismsgid(argv[i]))
2382 {
2383 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2384 argv[i]);
2385 return EXIT_FAILURE;
2386 }
2387
2388 /* Set up $sending_ip_address and $sending_port */
2389
2390 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2391 &size) == 0)
2392 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2393 &sending_port);
2394 else
2395 {
2396 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2397 strerror(errno));
2398 return EXIT_FAILURE;
2399 }
2400
2401 if (running_in_test_harness) millisleep(500);
2402 break;
2403 }
2404
2405 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2406 precedes -MC (see above). The flag indicates that the host to which
2407 Exim is connected has accepted an AUTH sequence. */
2408
2409 else if (Ustrcmp(argrest, "CA") == 0)
2410 {
2411 smtp_authenticated = TRUE;
2412 break;
2413 }
2414
2415 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2416 it preceded -MC (see above) */
2417
2418 else if (Ustrcmp(argrest, "CP") == 0)
2419 {
2420 smtp_use_pipelining = TRUE;
2421 break;
2422 }
2423
2424 /* -MCQ: pass on the pid of the queue-running process that started
2425 this chain of deliveries and the fd of its synchronizing pipe; this
2426 is useful only when it precedes -MC (see above) */
2427
2428 else if (Ustrcmp(argrest, "CQ") == 0)
2429 {
2430 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2431 else badarg = TRUE;
2432 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2433 else badarg = TRUE;
2434 break;
2435 }
2436
2437 /* -MCS: set the smtp_use_size flag; this is useful only when it
2438 precedes -MC (see above) */
2439
2440 else if (Ustrcmp(argrest, "CS") == 0)
2441 {
2442 smtp_use_size = TRUE;
2443 break;
2444 }
2445
2446 /* -MCT: set the tls_offered flag; this is useful only when it
2447 precedes -MC (see above). The flag indicates that the host to which
2448 Exim is connected has offered TLS support. */
2449
2450 #ifdef SUPPORT_TLS
2451 else if (Ustrcmp(argrest, "CT") == 0)
2452 {
2453 tls_offered = TRUE;
2454 break;
2455 }
2456 #endif
2457
2458 /* -M[x]: various operations on the following list of message ids:
2459 -M deliver the messages, ignoring next retry times and thawing
2460 -Mc deliver the messages, checking next retry times, no thawing
2461 -Mf freeze the messages
2462 -Mg give up on the messages
2463 -Mt thaw the messages
2464 -Mrm remove the messages
2465 In the above cases, this must be the last option. There are also the
2466 following options which are followed by a single message id, and which
2467 act on that message. Some of them use the "recipient" addresses as well.
2468 -Mar add recipient(s)
2469 -Mmad mark all recipients delivered
2470 -Mmd mark recipients(s) delivered
2471 -Mes edit sender
2472 -Mset load a message for use with -be
2473 -Mvb show body
2474 -Mvc show copy (of whole message, in RFC 2822 format)
2475 -Mvh show header
2476 -Mvl show log
2477 */
2478
2479 else if (*argrest == 0)
2480 {
2481 msg_action = MSG_DELIVER;
2482 forced_delivery = deliver_force_thaw = TRUE;
2483 }
2484 else if (Ustrcmp(argrest, "ar") == 0)
2485 {
2486 msg_action = MSG_ADD_RECIPIENT;
2487 one_msg_action = TRUE;
2488 }
2489 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2490 else if (Ustrcmp(argrest, "es") == 0)
2491 {
2492 msg_action = MSG_EDIT_SENDER;
2493 one_msg_action = TRUE;
2494 }
2495 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2496 else if (Ustrcmp(argrest, "g") == 0)
2497 {
2498 msg_action = MSG_DELIVER;
2499 deliver_give_up = TRUE;
2500 }
2501 else if (Ustrcmp(argrest, "mad") == 0)
2502 {
2503 msg_action = MSG_MARK_ALL_DELIVERED;
2504 }
2505 else if (Ustrcmp(argrest, "md") == 0)
2506 {
2507 msg_action = MSG_MARK_DELIVERED;
2508 one_msg_action = TRUE;
2509 }
2510 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2511 else if (Ustrcmp(argrest, "set") == 0)
2512 {
2513 msg_action = MSG_LOAD;
2514 one_msg_action = TRUE;
2515 }
2516 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2517 else if (Ustrcmp(argrest, "vb") == 0)
2518 {
2519 msg_action = MSG_SHOW_BODY;
2520 one_msg_action = TRUE;
2521 }
2522 else if (Ustrcmp(argrest, "vc") == 0)
2523 {
2524 msg_action = MSG_SHOW_COPY;
2525 one_msg_action = TRUE;
2526 }
2527 else if (Ustrcmp(argrest, "vh") == 0)
2528 {
2529 msg_action = MSG_SHOW_HEADER;
2530 one_msg_action = TRUE;
2531 }
2532 else if (Ustrcmp(argrest, "vl") == 0)
2533 {
2534 msg_action = MSG_SHOW_LOG;
2535 one_msg_action = TRUE;
2536 }
2537 else { badarg = TRUE; break; }
2538
2539 /* All the -Mxx options require at least one message id. */
2540
2541 msg_action_arg = i + 1;
2542 if (msg_action_arg >= argc)
2543 {
2544 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2545 return EXIT_FAILURE;
2546 }
2547
2548 /* Some require only message ids to follow */
2549
2550 if (!one_msg_action)
2551 {
2552 int j;
2553 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2554 {
2555 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2556 argv[j], arg);
2557 return EXIT_FAILURE;
2558 }
2559 goto END_ARG; /* Remaining args are ids */
2560 }
2561
2562 /* Others require only one message id, possibly followed by addresses,
2563 which will be handled as normal arguments. */
2564
2565 else
2566 {
2567 if (!mac_ismsgid(argv[msg_action_arg]))
2568 {
2569 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2570 argv[msg_action_arg], arg);
2571 return EXIT_FAILURE;
2572 }
2573 i++;
2574 }
2575 break;
2576
2577
2578 /* Some programs seem to call the -om option without the leading o;
2579 for sendmail it askes for "me too". Exim always does this. */
2580
2581 case 'm':
2582 if (*argrest != 0) badarg = TRUE;
2583 break;
2584
2585
2586 /* -N: don't do delivery - a debugging option that stops transports doing
2587 their thing. It implies debugging at the D_v level. */
2588
2589 case 'N':
2590 if (*argrest == 0)
2591 {
2592 dont_deliver = TRUE;
2593 debug_selector |= D_v;
2594 debug_file = stderr;
2595 }
2596 else badarg = TRUE;
2597 break;
2598
2599
2600 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2601 it. */
2602
2603 case 'n':
2604 break;
2605
2606 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2607 option to the specified value. This form uses long names. We need to handle
2608 -O option=value and -Ooption=value. */
2609
2610 case 'O':
2611 if (*argrest == 0)
2612 {
2613 if (++i >= argc)
2614 {
2615 fprintf(stderr, "exim: string expected after -O\n");
2616 exit(EXIT_FAILURE);
2617 }
2618 }
2619 break;
2620
2621 case 'o':
2622
2623 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2624 file" option). */
2625
2626 if (*argrest == 'A')
2627 {
2628 alias_arg = argrest + 1;
2629 if (alias_arg[0] == 0)
2630 {
2631 if (i+1 < argc) alias_arg = argv[++i]; else
2632 {
2633 fprintf(stderr, "exim: string expected after -oA\n");
2634 exit(EXIT_FAILURE);
2635 }
2636 }
2637 }
2638
2639 /* -oB: Set a connection message max value for remote deliveries */
2640
2641 else if (*argrest == 'B')
2642 {
2643 uschar *p = argrest + 1;
2644 if (p[0] == 0)
2645 {
2646 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2647 {
2648 connection_max_messages = 1;
2649 p = NULL;
2650 }
2651 }
2652
2653 if (p != NULL)
2654 {
2655 if (!isdigit(*p))
2656 {
2657 fprintf(stderr, "exim: number expected after -oB\n");
2658 exit(EXIT_FAILURE);
2659 }
2660 connection_max_messages = Uatoi(p);
2661 }
2662 }
2663
2664 /* -odb: background delivery */
2665
2666 else if (Ustrcmp(argrest, "db") == 0)
2667 {
2668 synchronous_delivery = FALSE;
2669 arg_queue_only = FALSE;
2670 queue_only_set = TRUE;
2671 }
2672
2673 /* -odf: foreground delivery (smail-compatible option); same effect as
2674 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2675 */
2676
2677 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2678 {
2679 synchronous_delivery = TRUE;
2680 arg_queue_only = FALSE;
2681 queue_only_set = TRUE;
2682 }
2683
2684 /* -odq: queue only */
2685
2686 else if (Ustrcmp(argrest, "dq") == 0)
2687 {
2688 synchronous_delivery = FALSE;
2689 arg_queue_only = TRUE;
2690 queue_only_set = TRUE;
2691 }
2692
2693 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2694 but no remote delivery */
2695
2696 else if (Ustrcmp(argrest, "dqs") == 0)
2697 {
2698 queue_smtp = TRUE;
2699 arg_queue_only = FALSE;
2700 queue_only_set = TRUE;
2701 }
2702
2703 /* -oex: Sendmail error flags. As these are also accepted without the
2704 leading -o prefix, for compatibility with vacation and other callers,
2705 they are handled with -e above. */
2706
2707 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2708 -oitrue: Another sendmail syntax for the same */
2709
2710 else if (Ustrcmp(argrest, "i") == 0 ||
2711 Ustrcmp(argrest, "itrue") == 0)
2712 dot_ends = FALSE;
2713
2714 /* -oM*: Set various characteristics for an incoming message; actually
2715 acted on for trusted callers only. */
2716
2717 else if (*argrest == 'M')
2718 {
2719 if (i+1 >= argc)
2720 {
2721 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2722 exit(EXIT_FAILURE);
2723 }
2724
2725 /* -oMa: Set sender host address */
2726
2727 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2728
2729 /* -oMaa: Set authenticator name */
2730
2731 else if (Ustrcmp(argrest, "Maa") == 0)
2732 sender_host_authenticated = argv[++i];
2733
2734 /* -oMas: setting authenticated sender */
2735
2736 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2737
2738 /* -oMai: setting authenticated id */
2739
2740 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2741
2742 /* -oMi: Set incoming interface address */
2743
2744 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2745
2746 /* -oMr: Received protocol */
2747
2748 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2749
2750 /* -oMs: Set sender host name */
2751
2752 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2753
2754 /* -oMt: Set sender ident */
2755
2756 else if (Ustrcmp(argrest, "Mt") == 0)
2757 {
2758 sender_ident_set = TRUE;
2759 sender_ident = argv[++i];
2760 }
2761
2762 /* Else a bad argument */
2763
2764 else
2765 {
2766 badarg = TRUE;
2767 break;
2768 }
2769 }
2770
2771 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2772 seem to call this as -m (undocumented), so that is also accepted (see
2773 above). */
2774
2775 else if (Ustrcmp(argrest, "m") == 0) {}
2776
2777 /* -oo: An ancient flag for old-style addresses which still seems to
2778 crop up in some calls (see in SCO). */
2779
2780 else if (Ustrcmp(argrest, "o") == 0) {}
2781
2782 /* -oP <name>: set pid file path for daemon */
2783
2784 else if (Ustrcmp(argrest, "P") == 0)
2785 override_pid_file_path = argv[++i];
2786
2787 /* -or <n>: set timeout for non-SMTP acceptance
2788 -os <n>: set timeout for SMTP acceptance */
2789
2790 else if (*argrest == 'r' || *argrest == 's')
2791 {
2792 int *tp = (*argrest == 'r')?
2793 &arg_receive_timeout : &arg_smtp_receive_timeout;
2794 if (argrest[1] == 0)
2795 {
2796 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2797 }
2798 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2799 if (*tp < 0)
2800 {
2801 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2802 exit(EXIT_FAILURE);
2803 }
2804 }
2805
2806 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2807
2808 else if (Ustrcmp(argrest, "X") == 0)
2809 override_local_interfaces = argv[++i];
2810
2811 /* Unknown -o argument */
2812
2813 else badarg = TRUE;
2814 break;
2815
2816
2817 /* -ps: force Perl startup; -pd force delayed Perl startup */
2818
2819 case 'p':
2820 #ifdef EXIM_PERL
2821 if (*argrest == 's' && argrest[1] == 0)
2822 {
2823 perl_start_option = 1;
2824 break;
2825 }
2826 if (*argrest == 'd' && argrest[1] == 0)
2827 {
2828 perl_start_option = -1;
2829 break;
2830 }
2831 #endif
2832
2833 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2834 which sets the host protocol and host name */
2835
2836 if (*argrest == 0)
2837 {
2838 if (i+1 < argc) argrest = argv[++i]; else
2839 { badarg = TRUE; break; }
2840 }
2841
2842 if (*argrest != 0)
2843 {
2844 uschar *hn = Ustrchr(argrest, ':');
2845 if (hn == NULL)
2846 {
2847 received_protocol = argrest;
2848 }
2849 else
2850 {
2851 received_protocol = string_copyn(argrest, hn - argrest);
2852 sender_host_name = hn + 1;
2853 }
2854 }
2855 break;
2856
2857
2858 case 'q':
2859 receiving_message = FALSE;
2860 if (queue_interval >= 0)
2861 {
2862 fprintf(stderr, "exim: -q specified more than once\n");
2863 exit(EXIT_FAILURE);
2864 }
2865
2866 /* -qq...: Do queue runs in a 2-stage manner */
2867
2868 if (*argrest == 'q')
2869 {
2870 queue_2stage = TRUE;
2871 argrest++;
2872 }
2873
2874 /* -qi...: Do only first (initial) deliveries */
2875
2876 if (*argrest == 'i')
2877 {
2878 queue_run_first_delivery = TRUE;
2879 argrest++;
2880 }
2881
2882 /* -qf...: Run the queue, forcing deliveries
2883 -qff..: Ditto, forcing thawing as well */
2884
2885 if (*argrest == 'f')
2886 {
2887 queue_run_force = TRUE;
2888 if (*(++argrest) == 'f')
2889 {
2890 deliver_force_thaw = TRUE;
2891 argrest++;
2892 }
2893 }
2894
2895 /* -q[f][f]l...: Run the queue only on local deliveries */
2896
2897 if (*argrest == 'l')
2898 {
2899 queue_run_local = TRUE;
2900 argrest++;
2901 }
2902
2903 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2904 optionally starting from a given message id. */
2905
2906 if (*argrest == 0 &&
2907 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2908 {
2909 queue_interval = 0;
2910 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2911 start_queue_run_id = argv[++i];
2912 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2913 stop_queue_run_id = argv[++i];
2914 }
2915
2916 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2917 optionally local only. */
2918
2919 else
2920 {
2921 if (*argrest != 0)
2922 queue_interval = readconf_readtime(argrest, 0, FALSE);
2923 else
2924 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2925 if (queue_interval <= 0)
2926 {
2927 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2928 exit(EXIT_FAILURE);
2929 }
2930 }
2931 break;
2932
2933
2934 case 'R': /* Synonymous with -qR... */
2935 receiving_message = FALSE;
2936
2937 /* -Rf: As -R (below) but force all deliveries,
2938 -Rff: Ditto, but also thaw all frozen messages,
2939 -Rr: String is regex
2940 -Rrf: Regex and force
2941 -Rrff: Regex and force and thaw
2942
2943 in all cases provided there are no further characters in this
2944 argument. */
2945
2946 if (*argrest != 0)
2947 {
2948 int i;
2949 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2950 {
2951 if (Ustrcmp(argrest, rsopts[i]) == 0)
2952 {
2953 if (i != 2) queue_run_force = TRUE;
2954 if (i >= 2) deliver_selectstring_regex = TRUE;
2955 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2956 argrest += Ustrlen(rsopts[i]);
2957 }
2958 }
2959 }
2960
2961 /* -R: Set string to match in addresses for forced queue run to
2962 pick out particular messages. */
2963
2964 if (*argrest == 0)
2965 {
2966 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2967 {
2968 fprintf(stderr, "exim: string expected after -R\n");
2969 exit(EXIT_FAILURE);
2970 }
2971 }
2972 else deliver_selectstring = argrest;
2973 break;
2974
2975
2976 /* -r: an obsolete synonym for -f (see above) */
2977
2978
2979 /* -S: Like -R but works on sender. */
2980
2981 case 'S': /* Synonymous with -qS... */
2982 receiving_message = FALSE;
2983
2984 /* -Sf: As -S (below) but force all deliveries,
2985 -Sff: Ditto, but also thaw all frozen messages,
2986 -Sr: String is regex
2987 -Srf: Regex and force
2988 -Srff: Regex and force and thaw
2989
2990 in all cases provided there are no further characters in this
2991 argument. */
2992
2993 if (*argrest != 0)
2994 {
2995 int i;
2996 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2997 {
2998 if (Ustrcmp(argrest, rsopts[i]) == 0)
2999 {
3000 if (i != 2) queue_run_force = TRUE;
3001 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3002 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3003 argrest += Ustrlen(rsopts[i]);
3004 }
3005 }
3006 }
3007
3008 /* -S: Set string to match in addresses for forced queue run to
3009 pick out particular messages. */
3010
3011 if (*argrest == 0)
3012 {
3013 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3014 {
3015 fprintf(stderr, "exim: string expected after -S\n");
3016 exit(EXIT_FAILURE);
3017 }
3018 }
3019 else deliver_selectstring_sender = argrest;
3020 break;
3021
3022 /* -Tqt is an option that is exclusively for use by the testing suite.
3023 It is not recognized in other circumstances. It allows for the setting up
3024 of explicit "queue times" so that various warning/retry things can be
3025 tested. Otherwise variability of clock ticks etc. cause problems. */
3026
3027 case 'T':
3028 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3029 fudged_queue_times = argv[++i];
3030 else badarg = TRUE;
3031 break;
3032
3033
3034 /* -t: Set flag to extract recipients from body of message. */
3035
3036 case 't':
3037 if (*argrest == 0) extract_recipients = TRUE;
3038
3039 /* -ti: Set flag to extract recipients from body of message, and also
3040 specify that dot does not end the message. */
3041
3042 else if (Ustrcmp(argrest, "i") == 0)
3043 {
3044 extract_recipients = TRUE;
3045 dot_ends = FALSE;
3046 }
3047
3048 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3049
3050 #ifdef SUPPORT_TLS
3051 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
3052 #endif
3053
3054 else badarg = TRUE;
3055 break;
3056
3057
3058 /* -U: This means "initial user submission" in sendmail, apparently. The
3059 doc claims that in future sendmail may refuse syntactically invalid
3060 messages instead of fixing them. For the moment, we just ignore it. */
3061
3062 case 'U':
3063 break;
3064
3065
3066 /* -v: verify things - this is a very low-level debugging */
3067
3068 case 'v':
3069 if (*argrest == 0)
3070 {
3071 debug_selector |= D_v;
3072 debug_file = stderr;
3073 }
3074 else badarg = TRUE;
3075 break;
3076
3077
3078 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3079
3080 The -x flag tells the sendmail command that mail from a local
3081 mail program has National Language Support (NLS) extended characters
3082 in the body of the mail item. The sendmail command can send mail with
3083 extended NLS characters across networks that normally corrupts these
3084 8-bit characters.
3085
3086 As Exim is 8-bit clean, it just ignores this flag. */
3087
3088 case 'x':
3089 if (*argrest != 0) badarg = TRUE;
3090 break;
3091
3092 /* All other initial characters are errors */
3093
3094 default:
3095 badarg = TRUE;
3096 break;
3097 } /* End of high-level switch statement */
3098
3099 /* Failed to recognize the option, or syntax error */
3100
3101 if (badarg)
3102 {
3103 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3104 "option %s\n", arg);
3105 exit(EXIT_FAILURE);
3106 }
3107 }
3108
3109
3110 /* If -R or -S have been specified without -q, assume a single queue run. */
3111
3112 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3113 queue_interval < 0) queue_interval = 0;
3114
3115
3116 END_ARG:
3117 /* If usage_wanted is set we call the usage function - which never returns */
3118 if (usage_wanted) exim_usage(called_as);
3119
3120 /* Arguments have been processed. Check for incompatibilities. */
3121 if ((
3122 (smtp_input || extract_recipients || recipients_arg < argc) &&
3123 (daemon_listen || queue_interval >= 0 || bi_option ||
3124 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3125 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3126 ) ||
3127 (
3128 msg_action_arg > 0 &&
3129 (daemon_listen || queue_interval >= 0 || list_options ||
3130 (checking && msg_action != MSG_LOAD) ||
3131 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3132 ) ||
3133 (
3134 (daemon_listen || queue_interval >= 0) &&
3135 (sender_address != NULL || list_options || list_queue || checking ||
3136 bi_option)
3137 ) ||
3138 (
3139 daemon_listen && queue_interval == 0
3140 ) ||
3141 (
3142 list_options &&
3143 (checking || smtp_input || extract_recipients ||
3144 filter_test != FTEST_NONE || bi_option)
3145 ) ||
3146 (
3147 verify_address_mode &&
3148 (address_test_mode || smtp_input || extract_recipients ||
3149 filter_test != FTEST_NONE || bi_option)
3150 ) ||
3151 (
3152 address_test_mode && (smtp_input || extract_recipients ||
3153 filter_test != FTEST_NONE || bi_option)
3154 ) ||
3155 (
3156 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3157 extract_recipients)
3158 ) ||
3159 (
3160 deliver_selectstring != NULL && queue_interval < 0
3161 ) ||
3162 (
3163 msg_action == MSG_LOAD &&
3164 (!expansion_test || expansion_test_message != NULL)
3165 )
3166 )
3167 {
3168 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3169 exit(EXIT_FAILURE);
3170 }
3171
3172 /* If debugging is set up, set the file and the file descriptor to pass on to
3173 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3174 to run in the foreground. */
3175
3176 if (debug_selector != 0)
3177 {
3178 debug_file = stderr;
3179 debug_fd = fileno(debug_file);
3180 background_daemon = FALSE;
3181 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3182 if (debug_selector != D_v) /* -v only doesn't show this */
3183 {
3184 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3185 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3186 debug_selector);
3187 if (!version_printed)
3188 show_whats_supported(stderr);
3189 }
3190 }
3191
3192 /* When started with root privilege, ensure that the limits on the number of
3193 open files and the number of processes (where that is accessible) are
3194 sufficiently large, or are unset, in case Exim has been called from an
3195 environment where the limits are screwed down. Not all OS have the ability to
3196 change some of these limits. */
3197
3198 if (unprivileged)
3199 {
3200 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3201 }
3202 else
3203 {
3204 struct rlimit rlp;
3205
3206 #ifdef RLIMIT_NOFILE
3207 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3208 {
3209 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3210 strerror(errno));
3211 rlp.rlim_cur = rlp.rlim_max = 0;
3212 }
3213
3214 /* I originally chose 1000 as a nice big number that was unlikely to
3215 be exceeded. It turns out that some older OS have a fixed upper limit of
3216 256. */
3217
3218 if (rlp.rlim_cur < 1000)
3219 {
3220 rlp.rlim_cur = rlp.rlim_max = 1000;
3221 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3222 {
3223 rlp.rlim_cur = rlp.rlim_max = 256;
3224 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3225 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3226 strerror(errno));
3227 }
3228 }
3229 #endif
3230
3231 #ifdef RLIMIT_NPROC
3232 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3233 {
3234 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3235 strerror(errno));
3236 rlp.rlim_cur = rlp.rlim_max = 0;
3237 }
3238
3239 #ifdef RLIM_INFINITY
3240 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3241 {
3242 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3243 #else
3244 if (rlp.rlim_cur < 1000)
3245 {
3246 rlp.rlim_cur = rlp.rlim_max = 1000;
3247 #endif
3248 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3249 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3250 strerror(errno));
3251 }
3252 #endif
3253 }
3254
3255 /* Exim is normally entered as root (but some special configurations are
3256 possible that don't do this). However, it always spins off sub-processes that
3257 set their uid and gid as required for local delivery. We don't want to pass on
3258 any extra groups that root may belong to, so we want to get rid of them all at
3259 this point.
3260
3261 We need to obey setgroups() at this stage, before possibly giving up root
3262 privilege for a changed configuration file, but later on we might need to
3263 check on the additional groups for the admin user privilege - can't do that
3264 till after reading the config, which might specify the exim gid. Therefore,
3265 save the group list here first. */
3266
3267 group_count = getgroups(NGROUPS_MAX, group_list);
3268
3269 /* There is a fundamental difference in some BSD systems in the matter of
3270 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3271 known not to be different. On the "different" systems there is a single group
3272 list, and the first entry in it is the current group. On all other versions of
3273 Unix there is a supplementary group list, which is in *addition* to the current
3274 group. Consequently, to get rid of all extraneous groups on a "standard" system
3275 you pass over 0 groups to setgroups(), while on a "different" system you pass
3276 over a single group - the current group, which is always the first group in the
3277 list. Calling setgroups() with zero groups on a "different" system results in
3278 an error return. The following code should cope with both types of system.
3279
3280 However, if this process isn't running as root, setgroups() can't be used
3281 since you have to be root to run it, even if throwing away groups. Not being
3282 root here happens only in some unusual configurations. We just ignore the
3283 error. */
3284
3285 if (setgroups(0, NULL) != 0)
3286 {
3287 if (setgroups(1, group_list) != 0 && !unprivileged)
3288 {
3289 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3290 exit(EXIT_FAILURE);
3291 }
3292 }
3293
3294 /* If the configuration file name has been altered by an argument on the
3295 command line (either a new file name or a macro definition) and the caller is
3296 not root, or if this is a filter testing run, remove any setuid privilege the
3297 program has and run as the underlying user.
3298
3299 The exim user is locked out of this, which severely restricts the use of -C
3300 for some purposes.
3301
3302 Otherwise, set the real ids to the effective values (should be root unless run
3303 from inetd, which it can either be root or the exim uid, if one is configured).
3304
3305 There is a private mechanism for bypassing some of this, in order to make it
3306 possible to test lots of configurations automatically, without having either to
3307 recompile each time, or to patch in an actual configuration file name and other
3308 values (such as the path name). If running in the test harness, pretend that
3309 configuration file changes and macro definitions haven't happened. */
3310
3311 if (( /* EITHER */
3312 (!trusted_config || /* Config changed, or */
3313 !macros_trusted()) && /* impermissible macros and */
3314 real_uid != root_uid && /* Not root, and */
3315 !running_in_test_harness /* Not fudged */
3316 ) || /* OR */
3317 expansion_test /* expansion testing */
3318 || /* OR */
3319 filter_test != FTEST_NONE) /* Filter testing */
3320 {
3321 setgroups(group_count, group_list);
3322 exim_setugid(real_uid, real_gid, FALSE,
3323 US"-C, -D, -be or -bf forces real uid");
3324 removed_privilege = TRUE;
3325
3326 /* In the normal case when Exim is called like this, stderr is available
3327 and should be used for any logging information because attempts to write
3328 to the log will usually fail. To arrange this, we unset really_exim. However,
3329 if no stderr is available there is no point - we might as well have a go
3330 at the log (if it fails, syslog will be written). */
3331
3332 if (log_stderr != NULL) really_exim = FALSE;
3333 }
3334
3335 /* Privilege is to be retained for the moment. It may be dropped later,
3336 depending on the job that this Exim process has been asked to do. For now, set
3337 the real uid to the effective so that subsequent re-execs of Exim are done by a
3338 privileged user. */
3339
3340 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3341
3342 /* If testing a filter, open the file(s) now, before wasting time doing other
3343 setups and reading the message. */
3344
3345 if ((filter_test & FTEST_SYSTEM) != 0)
3346 {
3347 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3348 if (filter_sfd < 0)
3349 {
3350 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3351 strerror(errno));
3352 return EXIT_FAILURE;
3353 }
3354 }
3355
3356 if ((filter_test & FTEST_USER) != 0)
3357 {
3358 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3359 if (filter_ufd < 0)
3360 {
3361 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3362 strerror(errno));
3363 return EXIT_FAILURE;
3364 }
3365 }
3366
3367 /* Read the main runtime configuration data; this gives up if there
3368 is a failure. It leaves the configuration file open so that the subsequent
3369 configuration data for delivery can be read if needed. */
3370
3371 readconf_main();
3372
3373 /* Handle the decoding of logging options. */
3374
3375 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3376 log_selector_string, log_options, log_options_count, US"log", 0);
3377
3378 DEBUG(D_any)
3379 {
3380 debug_printf("configuration file is %s\n", config_main_filename);
3381 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3382 log_extra_selector);
3383 }
3384
3385 /* If domain literals are not allowed, check the sender address that was
3386 supplied with -f. Ditto for a stripped trailing dot. */
3387
3388 if (sender_address != NULL)
3389 {
3390 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3391 {
3392 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3393 "allowed\n", sender_address);
3394 return EXIT_FAILURE;
3395 }
3396 if (f_end_dot && !strip_trailing_dot)
3397 {
3398 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3399 "(trailing dot not allowed)\n", sender_address);
3400 return EXIT_FAILURE;
3401 }
3402 }
3403
3404 /* Paranoia check of maximum lengths of certain strings. There is a check
3405 on the length of the log file path in log.c, which will come into effect
3406 if there are any calls to write the log earlier than this. However, if we
3407 get this far but the string is very long, it is better to stop now than to
3408 carry on and (e.g.) receive a message and then have to collapse. The call to
3409 log_write() from here will cause the ultimate panic collapse if the complete
3410 file name exceeds the buffer length. */
3411
3412 if (Ustrlen(log_file_path) > 200)
3413 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3414 "log_file_path is longer than 200 chars: aborting");
3415
3416 if (Ustrlen(pid_file_path) > 200)
3417 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3418 "pid_file_path is longer than 200 chars: aborting");
3419
3420 if (Ustrlen(spool_directory) > 200)
3421 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3422 "spool_directory is longer than 200 chars: aborting");
3423
3424 /* Length check on the process name given to syslog for its TAG field,
3425 which is only permitted to be 32 characters or less. See RFC 3164. */
3426
3427 if (Ustrlen(syslog_processname) > 32)
3428 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3429 "syslog_processname is longer than 32 chars: aborting");
3430
3431 /* In some operating systems, the environment variable TMPDIR controls where
3432 temporary files are created; Exim doesn't use these (apart from when delivering
3433 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3434 If TMPDIR is found in the environment, reset it to the value defined in the
3435 TMPDIR macro, if this macro is defined. */
3436
3437 #ifdef TMPDIR
3438 {
3439 uschar **p;
3440 for (p = USS environ; *p != NULL; p++)
3441 {
3442 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3443 Ustrcmp(*p+7, TMPDIR) != 0)
3444 {
3445 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3446 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3447 *p = newp;
3448 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3449 }
3450 }
3451 }
3452 #endif
3453
3454 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3455 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3456 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3457 called by a user who has set the TZ variable. This then affects the timestamps
3458 in log files and in Received: headers, and any created Date: header lines. The
3459 required timezone is settable in the configuration file, so nothing can be done
3460 about this earlier - but hopefully nothing will normally be logged earlier than
3461 this. We have to make a new environment if TZ is wrong, but don't bother if
3462 timestamps_utc is set, because then all times are in UTC anyway. */
3463
3464 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3465 {
3466 timestamps_utc = TRUE;
3467 }
3468 else
3469 {
3470 uschar *envtz = US getenv("TZ");
3471 if ((envtz == NULL && timezone_string != NULL) ||
3472 (envtz != NULL &&
3473 (timezone_string == NULL ||
3474 Ustrcmp(timezone_string, envtz) != 0)))
3475 {
3476 uschar **p = USS environ;
3477 uschar **new;
3478 uschar **newp;
3479 int count = 0;
3480 while (*p++ != NULL) count++;
3481 if (envtz == NULL) count++;
3482 newp = new = malloc(sizeof(uschar *) * (count + 1));
3483 for (p = USS environ; *p != NULL; p++)
3484 {
3485 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3486 *newp++ = *p;
3487 }
3488 if (timezone_string != NULL)
3489 {
3490 *newp = malloc(Ustrlen(timezone_string) + 4);
3491 sprintf(CS *newp++, "TZ=%s", timezone_string);
3492 }
3493 *newp = NULL;
3494 environ = CSS new;
3495 tzset();
3496 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3497 tod_stamp(tod_log));
3498 }
3499 }
3500
3501 /* Handle the case when we have removed the setuid privilege because of -C or
3502 -D. This means that the caller of Exim was not root.
3503
3504 There is a problem if we were running as the Exim user. The sysadmin may
3505 expect this case to retain privilege because "the binary was called by the
3506 Exim user", but it hasn't, because either the -D option set macros, or the
3507 -C option set a non-trusted configuration file. There are two possibilities:
3508
3509 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3510 to do message deliveries. Thus, the fact that it is running as a
3511 non-privileged user is plausible, and might be wanted in some special
3512 configurations. However, really_exim will have been set false when
3513 privilege was dropped, to stop Exim trying to write to its normal log
3514 files. Therefore, re-enable normal log processing, assuming the sysadmin
3515 has set up the log directory correctly.
3516
3517 (2) If deliver_drop_privilege is not set, the configuration won't work as
3518 apparently intended, and so we log a panic message. In order to retain
3519 root for -C or -D, the caller must either be root or be invoking a
3520 trusted configuration file (when deliver_drop_privilege is false). */
3521
3522 if (removed_privilege && (!trusted_config || macros != NULL) &&
3523 real_uid == exim_uid)
3524 {
3525 if (deliver_drop_privilege)
3526 really_exim = TRUE; /* let logging work normally */
3527 else
3528 log_write(0, LOG_MAIN|LOG_PANIC,
3529 "exim user lost privilege for using %s option",
3530 trusted_config? "-D" : "-C");
3531 }
3532
3533 /* Start up Perl interpreter if Perl support is configured and there is a
3534 perl_startup option, and the configuration or the command line specifies