3592f30ddce6ddc412dea92ef065c4e462eb353f
[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(const 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(const uschar *filename, const 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, save_errno;
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 save_errno = errno;
579 debug_printf(" auxiliary group list:");
580 if (group_count > 0)
581 {
582 int i;
583 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
584 }
585 else if (group_count < 0)
586 debug_printf(" <error: %s>", strerror(save_errno));
587 else debug_printf(" <none>");
588 debug_printf("\n");
589 }
590 }
591
592
593
594
595 /*************************************************
596 * Exit point *
597 *************************************************/
598
599 /* Exim exits via this function so that it always clears up any open
600 databases.
601
602 Arguments:
603 rc return code
604
605 Returns: does not return
606 */
607
608 void
609 exim_exit(int rc)
610 {
611 search_tidyup();
612 DEBUG(D_any)
613 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
614 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
615 exit(rc);
616 }
617
618
619
620
621 /*************************************************
622 * Extract port from host address *
623 *************************************************/
624
625 /* Called to extract the port from the values given to -oMa and -oMi.
626 It also checks the syntax of the address, and terminates it before the
627 port data when a port is extracted.
628
629 Argument:
630 address the address, with possible port on the end
631
632 Returns: the port, or zero if there isn't one
633 bombs out on a syntax error
634 */
635
636 static int
637 check_port(uschar *address)
638 {
639 int port = host_address_extract_port(address);
640 if (string_is_ip_address(address, NULL) == 0)
641 {
642 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
643 exit(EXIT_FAILURE);
644 }
645 return port;
646 }
647
648
649
650 /*************************************************
651 * Test/verify an address *
652 *************************************************/
653
654 /* This function is called by the -bv and -bt code. It extracts a working
655 address from a full RFC 822 address. This isn't really necessary per se, but it
656 has the effect of collapsing source routes.
657
658 Arguments:
659 s the address string
660 flags flag bits for verify_address()
661 exit_value to be set for failures
662
663 Returns: nothing
664 */
665
666 static void
667 test_address(uschar *s, int flags, int *exit_value)
668 {
669 int start, end, domain;
670 uschar *parse_error = NULL;
671 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
672 FALSE);
673 if (address == NULL)
674 {
675 fprintf(stdout, "syntax error: %s\n", parse_error);
676 *exit_value = 2;
677 }
678 else
679 {
680 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
681 -1, -1, NULL, NULL, NULL);
682 if (rc == FAIL) *exit_value = 2;
683 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
684 }
685 }
686
687
688
689 /*************************************************
690 * Show supported features *
691 *************************************************/
692
693 /* This function is called for -bV/--version and for -d to output the optional
694 features of the current Exim binary.
695
696 Arguments: a FILE for printing
697 Returns: nothing
698 */
699
700 static void
701 show_whats_supported(FILE *f)
702 {
703 #ifdef DB_VERSION_STRING
704 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
705 #elif defined(BTREEVERSION) && defined(HASHVERSION)
706 #ifdef USE_DB
707 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
708 #else
709 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
710 #endif
711 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
712 fprintf(f, "Probably ndbm\n");
713 #elif defined(USE_TDB)
714 fprintf(f, "Using tdb\n");
715 #else
716 #ifdef USE_GDBM
717 fprintf(f, "Probably GDBM (native mode)\n");
718 #else
719 fprintf(f, "Probably GDBM (compatibility mode)\n");
720 #endif
721 #endif
722
723 fprintf(f, "Support for:");
724 #ifdef SUPPORT_CRYPTEQ
725 fprintf(f, " crypteq");
726 #endif
727 #if HAVE_ICONV
728 fprintf(f, " iconv()");
729 #endif
730 #if HAVE_IPV6
731 fprintf(f, " IPv6");
732 #endif
733 #ifdef HAVE_SETCLASSRESOURCES
734 fprintf(f, " use_setclassresources");
735 #endif
736 #ifdef SUPPORT_PAM
737 fprintf(f, " PAM");
738 #endif
739 #ifdef EXIM_PERL
740 fprintf(f, " Perl");
741 #endif
742 #ifdef EXPAND_DLFUNC
743 fprintf(f, " Expand_dlfunc");
744 #endif
745 #ifdef USE_TCP_WRAPPERS
746 fprintf(f, " TCPwrappers");
747 #endif
748 #ifdef SUPPORT_TLS
749 #ifdef USE_GNUTLS
750 fprintf(f, " GnuTLS");
751 #else
752 fprintf(f, " OpenSSL");
753 #endif
754 #endif
755 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
756 fprintf(f, " translate_ip_address");
757 #endif
758 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
759 fprintf(f, " move_frozen_messages");
760 #endif
761 #ifdef WITH_CONTENT_SCAN
762 fprintf(f, " Content_Scanning");
763 #endif
764 #ifndef DISABLE_DKIM
765 fprintf(f, " DKIM");
766 #endif
767 #ifdef WITH_OLD_DEMIME
768 fprintf(f, " Old_Demime");
769 #endif
770 #ifdef EXPERIMENTAL_SPF
771 fprintf(f, " Experimental_SPF");
772 #endif
773 #ifdef EXPERIMENTAL_SRS
774 fprintf(f, " Experimental_SRS");
775 #endif
776 #ifdef EXPERIMENTAL_BRIGHTMAIL
777 fprintf(f, " Experimental_Brightmail");
778 #endif
779 #ifdef EXPERIMENTAL_DCC
780 fprintf(f, " Experimental_DCC");
781 #endif
782 fprintf(f, "\n");
783
784 fprintf(f, "Lookups (built-in):");
785 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
786 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
787 #endif
788 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
789 fprintf(f, " cdb");
790 #endif
791 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
792 fprintf(f, " dbm dbmnz");
793 #endif
794 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
795 fprintf(f, " dnsdb");
796 #endif
797 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
798 fprintf(f, " dsearch");
799 #endif
800 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
801 fprintf(f, " ibase");
802 #endif
803 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
804 fprintf(f, " ldap ldapdn ldapm");
805 #endif
806 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
807 fprintf(f, " mysql");
808 #endif
809 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
810 fprintf(f, " nis nis0");
811 #endif
812 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
813 fprintf(f, " nisplus");
814 #endif
815 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
816 fprintf(f, " oracle");
817 #endif
818 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
819 fprintf(f, " passwd");
820 #endif
821 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
822 fprintf(f, " pgsql");
823 #endif
824 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
825 fprintf(f, " sqlite");
826 #endif
827 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
828 fprintf(f, " testdb");
829 #endif
830 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
831 fprintf(f, " whoson");
832 #endif
833 fprintf(f, "\n");
834
835 fprintf(f, "Authenticators:");
836 #ifdef AUTH_CRAM_MD5
837 fprintf(f, " cram_md5");
838 #endif
839 #ifdef AUTH_CYRUS_SASL
840 fprintf(f, " cyrus_sasl");
841 #endif
842 #ifdef AUTH_DOVECOT
843 fprintf(f, " dovecot");
844 #endif
845 #ifdef AUTH_PLAINTEXT
846 fprintf(f, " plaintext");
847 #endif
848 #ifdef AUTH_SPA
849 fprintf(f, " spa");
850 #endif
851 fprintf(f, "\n");
852
853 fprintf(f, "Routers:");
854 #ifdef ROUTER_ACCEPT
855 fprintf(f, " accept");
856 #endif
857 #ifdef ROUTER_DNSLOOKUP
858 fprintf(f, " dnslookup");
859 #endif
860 #ifdef ROUTER_IPLITERAL
861 fprintf(f, " ipliteral");
862 #endif
863 #ifdef ROUTER_IPLOOKUP
864 fprintf(f, " iplookup");
865 #endif
866 #ifdef ROUTER_MANUALROUTE
867 fprintf(f, " manualroute");
868 #endif
869 #ifdef ROUTER_QUERYPROGRAM
870 fprintf(f, " queryprogram");
871 #endif
872 #ifdef ROUTER_REDIRECT
873 fprintf(f, " redirect");
874 #endif
875 fprintf(f, "\n");
876
877 fprintf(f, "Transports:");
878 #ifdef TRANSPORT_APPENDFILE
879 fprintf(f, " appendfile");
880 #ifdef SUPPORT_MAILDIR
881 fprintf(f, "/maildir");
882 #endif
883 #ifdef SUPPORT_MAILSTORE
884 fprintf(f, "/mailstore");
885 #endif
886 #ifdef SUPPORT_MBX
887 fprintf(f, "/mbx");
888 #endif
889 #endif
890 #ifdef TRANSPORT_AUTOREPLY
891 fprintf(f, " autoreply");
892 #endif
893 #ifdef TRANSPORT_LMTP
894 fprintf(f, " lmtp");
895 #endif
896 #ifdef TRANSPORT_PIPE
897 fprintf(f, " pipe");
898 #endif
899 #ifdef TRANSPORT_SMTP
900 fprintf(f, " smtp");
901 #endif
902 fprintf(f, "\n");
903
904 if (fixed_never_users[0] > 0)
905 {
906 int i;
907 fprintf(f, "Fixed never_users: ");
908 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
909 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
910 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
911 }
912
913 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
914
915 /* This runtime check is to help diagnose library linkage mismatches which
916 result in segfaults and the like; as such, it's left until the end,
917 just in case. There will still be a "Configuration file is" line still to
918 come. */
919 #ifdef SUPPORT_TLS
920 tls_version_report(f);
921 #endif
922
923 /* Everything else is details which are only worth reporting when debugging.
924 Perhaps the tls_version_report should move into this too. */
925 DEBUG(D_any) do {
926
927 int i;
928
929 /* clang defines __GNUC__ (at least, for me) so test for it first */
930 #if defined(__clang__)
931 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
932 #elif defined(__GNUC__)
933 fprintf(f, "Compiler: GCC [%s]\n",
934 # ifdef __VERSION__
935 __VERSION__
936 # else
937 "? unknown version ?"
938 # endif
939 );
940 #else
941 fprintf(f, "Compiler: <unknown>\n");
942 #endif
943
944 #ifdef AUTH_CYRUS_SASL
945 auth_cyrus_sasl_version_report(f);
946 #endif
947
948 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
949 " Runtime: %s\n",
950 PCRE_MAJOR, PCRE_MINOR,
951 /* PRE_PRERELEASE is either defined and empty or a string.
952 * unless its an ancient version of PCRE in which case it
953 * is not defined */
954 #ifdef PCRE_PRERELEASE
955 PCRE_PRERELEASE "",
956 #else
957 "",
958 #endif
959 pcre_version());
960
961 init_lookup_list();
962 for (i = 0; i < lookup_list_count; i++)
963 {
964 if (lookup_list[i]->version_report)
965 lookup_list[i]->version_report(f);
966 }
967
968 #ifdef WHITELIST_D_MACROS
969 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
970 #else
971 fprintf(f, "WHITELIST_D_MACROS unset\n");
972 #endif
973 #ifdef TRUSTED_CONFIG_LIST
974 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
975 #else
976 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
977 #endif
978
979 } while (0);
980 }
981
982
983
984
985 /*************************************************
986 * Quote a local part *
987 *************************************************/
988
989 /* This function is used when a sender address or a From: or Sender: header
990 line is being created from the caller's login, or from an authenticated_id. It
991 applies appropriate quoting rules for a local part.
992
993 Argument: the local part
994 Returns: the local part, quoted if necessary
995 */
996
997 uschar *
998 local_part_quote(uschar *lpart)
999 {
1000 BOOL needs_quote = FALSE;
1001 int size, ptr;
1002 uschar *yield;
1003 uschar *t;
1004
1005 for (t = lpart; !needs_quote && *t != 0; t++)
1006 {
1007 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1008 (*t != '.' || t == lpart || t[1] == 0);
1009 }
1010
1011 if (!needs_quote) return lpart;
1012
1013 size = ptr = 0;
1014 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1015
1016 for (;;)
1017 {
1018 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1019 if (nq == NULL)
1020 {
1021 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1022 break;
1023 }
1024 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1025 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1026 yield = string_cat(yield, &size, &ptr, nq, 1);
1027 lpart = nq + 1;
1028 }
1029
1030 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1031 yield[ptr] = 0;
1032 return yield;
1033 }
1034
1035
1036
1037 #ifdef USE_READLINE
1038 /*************************************************
1039 * Load readline() functions *
1040 *************************************************/
1041
1042 /* This function is called from testing executions that read data from stdin,
1043 but only when running as the calling user. Currently, only -be does this. The
1044 function loads the readline() function library and passes back the functions.
1045 On some systems, it needs the curses library, so load that too, but try without
1046 it if loading fails. All this functionality has to be requested at build time.
1047
1048 Arguments:
1049 fn_readline_ptr pointer to where to put the readline pointer
1050 fn_addhist_ptr pointer to where to put the addhistory function
1051
1052 Returns: the dlopen handle or NULL on failure
1053 */
1054
1055 static void *
1056 set_readline(char * (**fn_readline_ptr)(const char *),
1057 void (**fn_addhist_ptr)(const char *))
1058 {
1059 void *dlhandle;
1060 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1061
1062 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1063 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1064
1065 if (dlhandle != NULL)
1066 {
1067 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1068 * char * readline (const char *prompt);
1069 * void add_history (const char *string);
1070 */
1071 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1072 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1073 }
1074 else
1075 {
1076 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1077 }
1078
1079 return dlhandle;
1080 }
1081 #endif
1082
1083
1084
1085 /*************************************************
1086 * Get a line from stdin for testing things *
1087 *************************************************/
1088
1089 /* This function is called when running tests that can take a number of lines
1090 of input (for example, -be and -bt). It handles continuations and trailing
1091 spaces. And prompting and a blank line output on eof. If readline() is in use,
1092 the arguments are non-NULL and provide the relevant functions.
1093
1094 Arguments:
1095 fn_readline readline function or NULL
1096 fn_addhist addhist function or NULL
1097
1098 Returns: pointer to dynamic memory, or NULL at end of file
1099 */
1100
1101 static uschar *
1102 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1103 {
1104 int i;
1105 int size = 0;
1106 int ptr = 0;
1107 uschar *yield = NULL;
1108
1109 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1110
1111 for (i = 0;; i++)
1112 {
1113 uschar buffer[1024];
1114 uschar *p, *ss;
1115
1116 #ifdef USE_READLINE
1117 char *readline_line = NULL;
1118 if (fn_readline != NULL)
1119 {
1120 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1121 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1122 p = US readline_line;
1123 }
1124 else
1125 #endif
1126
1127 /* readline() not in use */
1128
1129 {
1130 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1131 p = buffer;
1132 }
1133
1134 /* Handle the line */
1135
1136 ss = p + (int)Ustrlen(p);
1137 while (ss > p && isspace(ss[-1])) ss--;
1138
1139 if (i > 0)
1140 {
1141 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1142 }
1143
1144 yield = string_cat(yield, &size, &ptr, p, ss - p);
1145
1146 #ifdef USE_READLINE
1147 if (fn_readline != NULL) free(readline_line);
1148 #endif
1149
1150 if (ss == p || yield[ptr-1] != '\\')
1151 {
1152 yield[ptr] = 0;
1153 break;
1154 }
1155 yield[--ptr] = 0;
1156 }
1157
1158 if (yield == NULL) printf("\n");
1159 return yield;
1160 }
1161
1162
1163
1164 /*************************************************
1165 * Output usage information for the program *
1166 *************************************************/
1167
1168 /* This function is called when there are no recipients
1169 or a specific --help argument was added.
1170
1171 Arguments:
1172 progname information on what name we were called by
1173
1174 Returns: DOES NOT RETURN
1175 */
1176
1177 static void
1178 exim_usage(uschar *progname)
1179 {
1180
1181 /* Handle specific program invocation varients */
1182 if (Ustrcmp(progname, US"-mailq") == 0)
1183 {
1184 fprintf(stderr,
1185 "mailq - list the contents of the mail queue\n\n"
1186 "For a list of options, see the Exim documentation.\n");
1187 exit(EXIT_FAILURE);
1188 }
1189
1190 /* Generic usage - we output this whatever happens */
1191 fprintf(stderr,
1192 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1193 "not directly from a shell command line. Options and/or arguments control\n"
1194 "what it does when called. For a list of options, see the Exim documentation.\n");
1195
1196 exit(EXIT_FAILURE);
1197 }
1198
1199
1200
1201 /*************************************************
1202 * Validate that the macros given are okay *
1203 *************************************************/
1204
1205 /* Typically, Exim will drop privileges if macros are supplied. In some
1206 cases, we want to not do so.
1207
1208 Arguments: none (macros is a global)
1209 Returns: true if trusted, false otherwise
1210 */
1211
1212 static BOOL
1213 macros_trusted(void)
1214 {
1215 #ifdef WHITELIST_D_MACROS
1216 macro_item *m;
1217 uschar *whitelisted, *end, *p, **whites, **w;
1218 int white_count, i, n;
1219 size_t len;
1220 BOOL prev_char_item, found;
1221 #endif
1222
1223 if (macros == NULL)
1224 return TRUE;
1225 #ifndef WHITELIST_D_MACROS
1226 return FALSE;
1227 #else
1228
1229 /* We only trust -D overrides for some invoking users:
1230 root, the exim run-time user, the optional config owner user.
1231 I don't know why config-owner would be needed, but since they can own the
1232 config files anyway, there's no security risk to letting them override -D. */
1233 if ( ! ((real_uid == root_uid)
1234 || (real_uid == exim_uid)
1235 #ifdef CONFIGURE_OWNER
1236 || (real_uid == config_uid)
1237 #endif
1238 ))
1239 {
1240 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1241 return FALSE;
1242 }
1243
1244 /* Get a list of macros which are whitelisted */
1245 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1246 prev_char_item = FALSE;
1247 white_count = 0;
1248 for (p = whitelisted; *p != '\0'; ++p)
1249 {
1250 if (*p == ':' || isspace(*p))
1251 {
1252 *p = '\0';
1253 if (prev_char_item)
1254 ++white_count;
1255 prev_char_item = FALSE;
1256 continue;
1257 }
1258 if (!prev_char_item)
1259 prev_char_item = TRUE;
1260 }
1261 end = p;
1262 if (prev_char_item)
1263 ++white_count;
1264 if (!white_count)
1265 return FALSE;
1266 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1267 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1268 {
1269 if (*p != '\0')
1270 {
1271 whites[i++] = p;
1272 if (i == white_count)
1273 break;
1274 while (*p != '\0' && p < end)
1275 ++p;
1276 }
1277 }
1278 whites[i] = NULL;
1279
1280 /* The list of macros should be very short. Accept the N*M complexity. */
1281 for (m = macros; m != NULL; m = m->next)
1282 {
1283 found = FALSE;
1284 for (w = whites; *w; ++w)
1285 if (Ustrcmp(*w, m->name) == 0)
1286 {
1287 found = TRUE;
1288 break;
1289 }
1290 if (!found)
1291 return FALSE;
1292 if (m->replacement == NULL)
1293 continue;
1294 len = Ustrlen(m->replacement);
1295 if (len == 0)
1296 continue;
1297 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1298 0, PCRE_EOPT, NULL, 0);
1299 if (n < 0)
1300 {
1301 if (n != PCRE_ERROR_NOMATCH)
1302 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1303 return FALSE;
1304 }
1305 }
1306 DEBUG(D_any) debug_printf("macros_trusted overriden to true by whitelisting\n");
1307 return TRUE;
1308 #endif
1309 }
1310
1311
1312 /*************************************************
1313 * Entry point and high-level code *
1314 *************************************************/
1315
1316 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1317 the appropriate action. All the necessary functions are present in the one
1318 binary. I originally thought one should split it up, but it turns out that so
1319 much of the apparatus is needed in each chunk that one might as well just have
1320 it all available all the time, which then makes the coding easier as well.
1321
1322 Arguments:
1323 argc count of entries in argv
1324 argv argument strings, with argv[0] being the program name
1325
1326 Returns: EXIT_SUCCESS if terminated successfully
1327 EXIT_FAILURE otherwise, except when a message has been sent
1328 to the sender, and -oee was given
1329 */
1330
1331 int
1332 main(int argc, char **cargv)
1333 {
1334 uschar **argv = USS cargv;
1335 int arg_receive_timeout = -1;
1336 int arg_smtp_receive_timeout = -1;
1337 int arg_error_handling = error_handling;
1338 int filter_sfd = -1;
1339 int filter_ufd = -1;
1340 int group_count;
1341 int i, rv;
1342 int list_queue_option = 0;
1343 int msg_action = 0;
1344 int msg_action_arg = -1;
1345 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1346 int queue_only_reason = 0;
1347 #ifdef EXIM_PERL
1348 int perl_start_option = 0;
1349 #endif
1350 int recipients_arg = argc;
1351 int sender_address_domain = 0;
1352 int test_retry_arg = -1;
1353 int test_rewrite_arg = -1;
1354 BOOL arg_queue_only = FALSE;
1355 BOOL bi_option = FALSE;
1356 BOOL checking = FALSE;
1357 BOOL count_queue = FALSE;
1358 BOOL expansion_test = FALSE;
1359 BOOL extract_recipients = FALSE;
1360 BOOL forced_delivery = FALSE;
1361 BOOL f_end_dot = FALSE;
1362 BOOL deliver_give_up = FALSE;
1363 BOOL list_queue = FALSE;
1364 BOOL list_options = FALSE;
1365 BOOL local_queue_only;
1366 BOOL more = TRUE;
1367 BOOL one_msg_action = FALSE;
1368 BOOL queue_only_set = FALSE;
1369 BOOL receiving_message = TRUE;
1370 BOOL sender_ident_set = FALSE;
1371 BOOL session_local_queue_only;
1372 BOOL unprivileged;
1373 BOOL removed_privilege = FALSE;
1374 BOOL usage_wanted = FALSE;
1375 BOOL verify_address_mode = FALSE;
1376 BOOL verify_as_sender = FALSE;
1377 BOOL version_printed = FALSE;
1378 uschar *alias_arg = NULL;
1379 uschar *called_as = US"";
1380 uschar *start_queue_run_id = NULL;
1381 uschar *stop_queue_run_id = NULL;
1382 uschar *expansion_test_message = NULL;
1383 uschar *ftest_domain = NULL;
1384 uschar *ftest_localpart = NULL;
1385 uschar *ftest_prefix = NULL;
1386 uschar *ftest_suffix = NULL;
1387 uschar *malware_test_file = NULL;
1388 uschar *real_sender_address;
1389 uschar *originator_home = US"/";
1390 void *reset_point;
1391
1392 struct passwd *pw;
1393 struct stat statbuf;
1394 pid_t passed_qr_pid = (pid_t)0;
1395 int passed_qr_pipe = -1;
1396 gid_t group_list[NGROUPS_MAX];
1397
1398 /* Possible options for -R and -S */
1399
1400 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1401
1402 /* Need to define this in case we need to change the environment in order
1403 to get rid of a bogus time zone. We have to make it char rather than uschar
1404 because some OS define it in /usr/include/unistd.h. */
1405
1406 extern char **environ;
1407
1408 /* If the Exim user and/or group and/or the configuration file owner/group were
1409 defined by ref:name at build time, we must now find the actual uid/gid values.
1410 This is a feature to make the lives of binary distributors easier. */
1411
1412 #ifdef EXIM_USERNAME
1413 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1414 {
1415 if (exim_uid == 0)
1416 {
1417 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1418 EXIM_USERNAME);
1419 exit(EXIT_FAILURE);
1420 }
1421 exim_gid = pw->pw_gid;
1422 }
1423 else
1424 {
1425 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1426 EXIM_USERNAME);
1427 exit(EXIT_FAILURE);
1428 }
1429 #endif
1430
1431 #ifdef EXIM_GROUPNAME
1432 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1433 {
1434 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1435 EXIM_GROUPNAME);
1436 exit(EXIT_FAILURE);
1437 }
1438 #endif
1439
1440 #ifdef CONFIGURE_OWNERNAME
1441 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1442 {
1443 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1444 CONFIGURE_OWNERNAME);
1445 exit(EXIT_FAILURE);
1446 }
1447 #endif
1448
1449 /* We default the system_filter_user to be the Exim run-time user, as a
1450 sane non-root value. */
1451 system_filter_uid = exim_uid;
1452
1453 #ifdef CONFIGURE_GROUPNAME
1454 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1455 {
1456 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1457 CONFIGURE_GROUPNAME);
1458 exit(EXIT_FAILURE);
1459 }
1460 #endif
1461
1462 /* In the Cygwin environment, some initialization needs doing. It is fudged
1463 in by means of this macro. */
1464
1465 #ifdef OS_INIT
1466 OS_INIT
1467 #endif
1468
1469 /* Check a field which is patched when we are running Exim within its
1470 testing harness; do a fast initial check, and then the whole thing. */
1471
1472 running_in_test_harness =
1473 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1474
1475 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1476 at the start of a program; however, it seems that some environments do not
1477 follow this. A "strange" locale can affect the formatting of timestamps, so we
1478 make quite sure. */
1479
1480 setlocale(LC_ALL, "C");
1481
1482 /* Set up the default handler for timing using alarm(). */
1483
1484 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1485
1486 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1487 because store_malloc writes a log entry on failure. */
1488
1489 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1490 if (log_buffer == NULL)
1491 {
1492 fprintf(stderr, "exim: failed to get store for log buffer\n");
1493 exit(EXIT_FAILURE);
1494 }
1495
1496 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1497 NULL when the daemon is run and the file is closed. We have to use this
1498 indirection, because some systems don't allow writing to the variable "stderr".
1499 */
1500
1501 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1502
1503 /* Arrange for the PCRE regex library to use our store functions. Note that
1504 the normal calls are actually macros that add additional arguments for
1505 debugging purposes so we have to assign specially constructed functions here.
1506 The default is to use store in the stacking pool, but this is overridden in the
1507 regex_must_compile() function. */
1508
1509 pcre_malloc = function_store_get;
1510 pcre_free = function_dummy_free;
1511
1512 /* Ensure there is a big buffer for temporary use in several places. It is put
1513 in malloc store so that it can be freed for enlargement if necessary. */
1514
1515 big_buffer = store_malloc(big_buffer_size);
1516
1517 /* Set up the handler for the data request signal, and set the initial
1518 descriptive text. */
1519
1520 set_process_info("initializing");
1521 os_restarting_signal(SIGUSR1, usr1_handler);
1522
1523 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1524 in the daemon code. For the rest of Exim's uses, we ignore it. */
1525
1526 signal(SIGHUP, SIG_IGN);
1527
1528 /* We don't want to die on pipe errors as the code is written to handle
1529 the write error instead. */
1530
1531 signal(SIGPIPE, SIG_IGN);
1532
1533 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1534 set to SIG_IGN. This causes subprocesses that complete before the parent
1535 process waits for them not to hang around, so when Exim calls wait(), nothing
1536 is there. The wait() code has been made robust against this, but let's ensure
1537 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1538 ending status. We use sigaction rather than plain signal() on those OS where
1539 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1540 problem on AIX with this.) */
1541
1542 #ifdef SA_NOCLDWAIT
1543 {
1544 struct sigaction act;
1545 act.sa_handler = SIG_DFL;
1546 sigemptyset(&(act.sa_mask));
1547 act.sa_flags = 0;
1548 sigaction(SIGCHLD, &act, NULL);
1549 }
1550 #else
1551 signal(SIGCHLD, SIG_DFL);
1552 #endif
1553
1554 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1555 SIGHUP. */
1556
1557 sighup_argv = argv;
1558
1559 /* Set up the version number. Set up the leading 'E' for the external form of
1560 message ids, set the pointer to the internal form, and initialize it to
1561 indicate no message being processed. */
1562
1563 version_init();
1564 message_id_option[0] = '-';
1565 message_id_external = message_id_option + 1;
1566 message_id_external[0] = 'E';
1567 message_id = message_id_external + 1;
1568 message_id[0] = 0;
1569
1570 /* Set the umask to zero so that any files Exim creates using open() are
1571 created with the modes that it specifies. NOTE: Files created with fopen() have
1572 a problem, which was not recognized till rather late (February 2006). With this
1573 umask, such files will be world writeable. (They are all content scanning files
1574 in the spool directory, which isn't world-accessible, so this is not a
1575 disaster, but it's untidy.) I don't want to change this overall setting,
1576 however, because it will interact badly with the open() calls. Instead, there's
1577 now a function called modefopen() that fiddles with the umask while calling
1578 fopen(). */
1579
1580 (void)umask(0);
1581
1582 /* Precompile the regular expression for matching a message id. Keep this in
1583 step with the code that generates ids in the accept.c module. We need to do
1584 this here, because the -M options check their arguments for syntactic validity
1585 using mac_ismsgid, which uses this. */
1586
1587 regex_ismsgid =
1588 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1589
1590 /* Precompile the regular expression that is used for matching an SMTP error
1591 code, possibly extended, at the start of an error message. Note that the
1592 terminating whitespace character is included. */
1593
1594 regex_smtp_code =
1595 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1596 FALSE, TRUE);
1597
1598 #ifdef WHITELIST_D_MACROS
1599 /* Precompile the regular expression used to filter the content of macros
1600 given to -D for permissibility. */
1601
1602 regex_whitelisted_macro =
1603 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1604 #endif
1605
1606
1607 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1608 this seems to be a generally accepted convention, since one finds symbolic
1609 links called "mailq" in standard OS configurations. */
1610
1611 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1612 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1613 {
1614 list_queue = TRUE;
1615 receiving_message = FALSE;
1616 called_as = US"-mailq";
1617 }
1618
1619 /* If the program is called as "rmail" treat it as equivalent to
1620 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1621 i.e. preventing a single dot on a line from terminating the message, and
1622 returning with zero return code, even in cases of error (provided an error
1623 message has been sent). */
1624
1625 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1626 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1627 {
1628 dot_ends = FALSE;
1629 called_as = US"-rmail";
1630 errors_sender_rc = EXIT_SUCCESS;
1631 }
1632
1633 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1634 this is a smail convention. */
1635
1636 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1637 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1638 {
1639 smtp_input = smtp_batched_input = TRUE;
1640 called_as = US"-rsmtp";
1641 }
1642
1643 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1644 this is a smail convention. */
1645
1646 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1647 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1648 {
1649 queue_interval = 0;
1650 receiving_message = FALSE;
1651 called_as = US"-runq";
1652 }
1653
1654 /* If the program is called as "newaliases" treat it as equivalent to
1655 "exim -bi"; this is a sendmail convention. */
1656
1657 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1658 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1659 {
1660 bi_option = TRUE;
1661 receiving_message = FALSE;
1662 called_as = US"-newaliases";
1663 }
1664
1665 /* Save the original effective uid for a couple of uses later. It should
1666 normally be root, but in some esoteric environments it may not be. */
1667
1668 original_euid = geteuid();
1669
1670 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1671 to be the same as the real ones. This makes a difference only if Exim is setuid
1672 (or setgid) to something other than root, which could be the case in some
1673 special configurations. */
1674
1675 real_uid = getuid();
1676 real_gid = getgid();
1677
1678 if (real_uid == root_uid)
1679 {
1680 rv = setgid(real_gid);
1681 if (rv)
1682 {
1683 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1684 (long int)real_gid, strerror(errno));
1685 exit(EXIT_FAILURE);
1686 }
1687 rv = setuid(real_uid);
1688 if (rv)
1689 {
1690 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1691 (long int)real_uid, strerror(errno));
1692 exit(EXIT_FAILURE);
1693 }
1694 }
1695
1696 /* If neither the original real uid nor the original euid was root, Exim is
1697 running in an unprivileged state. */
1698
1699 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1700
1701 /* Scan the program's arguments. Some can be dealt with right away; others are
1702 simply recorded for checking and handling afterwards. Do a high-level switch
1703 on the second character (the one after '-'), to save some effort. */
1704
1705 for (i = 1; i < argc; i++)
1706 {
1707 BOOL badarg = FALSE;
1708 uschar *arg = argv[i];
1709 uschar *argrest;
1710 int switchchar;
1711
1712 /* An argument not starting with '-' is the start of a recipients list;
1713 break out of the options-scanning loop. */
1714
1715 if (arg[0] != '-')
1716 {
1717 recipients_arg = i;
1718 break;
1719 }
1720
1721 /* An option consistion of -- terminates the options */
1722
1723 if (Ustrcmp(arg, "--") == 0)
1724 {
1725 recipients_arg = i + 1;
1726 break;
1727 }
1728
1729 /* Handle flagged options */
1730
1731 switchchar = arg[1];
1732 argrest = arg+2;
1733
1734 /* Make all -ex options synonymous with -oex arguments, since that
1735 is assumed by various callers. Also make -qR options synonymous with -R
1736 options, as that seems to be required as well. Allow for -qqR too, and
1737 the same for -S options. */
1738
1739 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1740 Ustrncmp(arg+1, "qR", 2) == 0 ||
1741 Ustrncmp(arg+1, "qS", 2) == 0)
1742 {
1743 switchchar = arg[2];
1744 argrest++;
1745 }
1746 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1747 {
1748 switchchar = arg[3];
1749 argrest += 2;
1750 queue_2stage = TRUE;
1751 }
1752
1753 /* Make -r synonymous with -f, since it is a documented alias */
1754
1755 else if (arg[1] == 'r') switchchar = 'f';
1756
1757 /* Make -ov synonymous with -v */
1758
1759 else if (Ustrcmp(arg, "-ov") == 0)
1760 {
1761 switchchar = 'v';
1762 argrest++;
1763 }
1764
1765 /* deal with --option_aliases */
1766 else if (switchchar == '-')
1767 {
1768 if (Ustrcmp(argrest, "help") == 0)
1769 {
1770 usage_wanted = TRUE;
1771 break;
1772 }
1773 else if (Ustrcmp(argrest, "version") == 0)
1774 {
1775 switchchar = 'b';
1776 argrest = US"V";
1777 }
1778 }
1779
1780 /* High-level switch on active initial letter */
1781
1782 switch(switchchar)
1783 {
1784 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1785 so has no need of it. */
1786
1787 case 'B':
1788 if (*argrest == 0) i++; /* Skip over the type */
1789 break;
1790
1791
1792 case 'b':
1793 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1794
1795 /* -bd: Run in daemon mode, awaiting SMTP connections.
1796 -bdf: Ditto, but in the foreground.
1797 */
1798
1799 if (*argrest == 'd')
1800 {
1801 daemon_listen = TRUE;
1802 if (*(++argrest) == 'f') background_daemon = FALSE;
1803 else if (*argrest != 0) { badarg = TRUE; break; }
1804 }
1805
1806 /* -be: Run in expansion test mode
1807 -bem: Ditto, but read a message from a file first
1808 */
1809
1810 else if (*argrest == 'e')
1811 {
1812 expansion_test = checking = TRUE;
1813 if (argrest[1] == 'm')
1814 {
1815 if (++i >= argc) { badarg = TRUE; break; }
1816 expansion_test_message = argv[i];
1817 argrest++;
1818 }
1819 if (argrest[1] != 0) { badarg = TRUE; break; }
1820 }
1821
1822 /* -bF: Run system filter test */
1823
1824 else if (*argrest == 'F')
1825 {
1826 filter_test |= FTEST_SYSTEM;
1827 if (*(++argrest) != 0) { badarg = TRUE; break; }
1828 if (++i < argc) filter_test_sfile = argv[i]; else
1829 {
1830 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1831 exit(EXIT_FAILURE);
1832 }
1833 }
1834
1835 /* -bf: Run user filter test
1836 -bfd: Set domain for filter testing
1837 -bfl: Set local part for filter testing
1838 -bfp: Set prefix for filter testing
1839 -bfs: Set suffix for filter testing
1840 */
1841
1842 else if (*argrest == 'f')
1843 {
1844 if (*(++argrest) == 0)
1845 {
1846 filter_test |= FTEST_USER;
1847 if (++i < argc) filter_test_ufile = argv[i]; else
1848 {
1849 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1850 exit(EXIT_FAILURE);
1851 }
1852 }
1853 else
1854 {
1855 if (++i >= argc)
1856 {
1857 fprintf(stderr, "exim: string expected after %s\n", arg);
1858 exit(EXIT_FAILURE);
1859 }
1860 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1861 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1862 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1863 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1864 else { badarg = TRUE; break; }
1865 }
1866 }
1867
1868 /* -bh: Host checking - an IP address must follow. */
1869
1870 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1871 {
1872 if (++i >= argc) { badarg = TRUE; break; }
1873 sender_host_address = argv[i];
1874 host_checking = checking = log_testing_mode = TRUE;
1875 host_checking_callout = argrest[1] == 'c';
1876 }
1877
1878 /* -bi: This option is used by sendmail to initialize *the* alias file,
1879 though it has the -oA option to specify a different file. Exim has no
1880 concept of *the* alias file, but since Sun's YP make script calls
1881 sendmail this way, some support must be provided. */
1882
1883 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1884
1885 /* -bm: Accept and deliver message - the default option. Reinstate
1886 receiving_message, which got turned off for all -b options. */
1887
1888 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1889
1890 /* -bmalware: test the filename given for malware */
1891
1892 else if (Ustrcmp(argrest, "malware") == 0)
1893 {
1894 if (++i >= argc) { badarg = TRUE; break; }
1895 malware_test_file = argv[i];
1896 }
1897
1898 /* -bnq: For locally originating messages, do not qualify unqualified
1899 addresses. In the envelope, this causes errors; in header lines they
1900 just get left. */
1901
1902 else if (Ustrcmp(argrest, "nq") == 0)
1903 {
1904 allow_unqualified_sender = FALSE;
1905 allow_unqualified_recipient = FALSE;
1906 }
1907
1908 /* -bpxx: List the contents of the mail queue, in various forms. If
1909 the option is -bpc, just a queue count is needed. Otherwise, if the
1910 first letter after p is r, then order is random. */
1911
1912 else if (*argrest == 'p')
1913 {
1914 if (*(++argrest) == 'c')
1915 {
1916 count_queue = TRUE;
1917 if (*(++argrest) != 0) badarg = TRUE;
1918 break;
1919 }
1920
1921 if (*argrest == 'r')
1922 {
1923 list_queue_option = 8;
1924 argrest++;
1925 }
1926 else list_queue_option = 0;
1927
1928 list_queue = TRUE;
1929
1930 /* -bp: List the contents of the mail queue, top-level only */
1931
1932 if (*argrest == 0) {}
1933
1934 /* -bpu: List the contents of the mail queue, top-level undelivered */
1935
1936 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1937
1938 /* -bpa: List the contents of the mail queue, including all delivered */
1939
1940 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1941
1942 /* Unknown after -bp[r] */
1943
1944 else
1945 {
1946 badarg = TRUE;
1947 break;
1948 }
1949 }
1950
1951
1952 /* -bP: List the configuration variables given as the address list.
1953 Force -v, so configuration errors get displayed. */
1954
1955 else if (Ustrcmp(argrest, "P") == 0)
1956 {
1957 list_options = TRUE;
1958 debug_selector |= D_v;
1959 debug_file = stderr;
1960 }
1961
1962 /* -brt: Test retry configuration lookup */
1963
1964 else if (Ustrcmp(argrest, "rt") == 0)
1965 {
1966 test_retry_arg = i + 1;
1967 goto END_ARG;
1968 }
1969
1970 /* -brw: Test rewrite configuration */
1971
1972 else if (Ustrcmp(argrest, "rw") == 0)
1973 {
1974 test_rewrite_arg = i + 1;
1975 goto END_ARG;
1976 }
1977
1978 /* -bS: Read SMTP commands on standard input, but produce no replies -
1979 all errors are reported by sending messages. */
1980
1981 else if (Ustrcmp(argrest, "S") == 0)
1982 smtp_input = smtp_batched_input = receiving_message = TRUE;
1983
1984 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1985 on standard output. */
1986
1987 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1988
1989 /* -bt: address testing mode */
1990
1991 else if (Ustrcmp(argrest, "t") == 0)
1992 address_test_mode = checking = log_testing_mode = TRUE;
1993
1994 /* -bv: verify addresses */
1995
1996 else if (Ustrcmp(argrest, "v") == 0)
1997 verify_address_mode = checking = log_testing_mode = TRUE;
1998
1999 /* -bvs: verify sender addresses */
2000
2001 else if (Ustrcmp(argrest, "vs") == 0)
2002 {
2003 verify_address_mode = checking = log_testing_mode = TRUE;
2004 verify_as_sender = TRUE;
2005 }
2006
2007 /* -bV: Print version string and support details */
2008
2009 else if (Ustrcmp(argrest, "V") == 0)
2010 {
2011 printf("Exim version %s #%s built %s\n", version_string,
2012 version_cnumber, version_date);
2013 printf("%s\n", CS version_copyright);
2014 version_printed = TRUE;
2015 show_whats_supported(stdout);
2016 }
2017
2018 else badarg = TRUE;
2019 break;
2020
2021
2022 /* -C: change configuration file list; ignore if it isn't really
2023 a change! Enforce a prefix check if required. */
2024
2025 case 'C':
2026 if (*argrest == 0)
2027 {
2028 if(++i < argc) argrest = argv[i]; else
2029 { badarg = TRUE; break; }
2030 }
2031 if (Ustrcmp(config_main_filelist, argrest) != 0)
2032 {
2033 #ifdef ALT_CONFIG_PREFIX
2034 int sep = 0;
2035 int len = Ustrlen(ALT_CONFIG_PREFIX);
2036 uschar *list = argrest;
2037 uschar *filename;
2038 while((filename = string_nextinlist(&list, &sep, big_buffer,
2039 big_buffer_size)) != NULL)
2040 {
2041 if ((Ustrlen(filename) < len ||
2042 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2043 Ustrstr(filename, "/../") != NULL) &&
2044 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2045 {
2046 fprintf(stderr, "-C Permission denied\n");
2047 exit(EXIT_FAILURE);
2048 }
2049 }
2050 #endif
2051 if (real_uid != root_uid)
2052 {
2053 #ifdef TRUSTED_CONFIG_LIST
2054
2055 if (real_uid != exim_uid
2056 #ifdef CONFIGURE_OWNER
2057 && real_uid != config_uid
2058 #endif
2059 )
2060 trusted_config = FALSE;
2061 else
2062 {
2063 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2064 if (trust_list)
2065 {
2066 struct stat statbuf;
2067
2068 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2069 (statbuf.st_uid != root_uid /* owner not root */
2070 #ifdef CONFIGURE_OWNER
2071 && statbuf.st_uid != config_uid /* owner not the special one */
2072 #endif
2073 ) || /* or */
2074 (statbuf.st_gid != root_gid /* group not root */
2075 #ifdef CONFIGURE_GROUP
2076 && statbuf.st_gid != config_gid /* group not the special one */
2077 #endif
2078 && (statbuf.st_mode & 020) != 0 /* group writeable */
2079 ) || /* or */
2080 (statbuf.st_mode & 2) != 0) /* world writeable */
2081 {
2082 trusted_config = FALSE;
2083 fclose(trust_list);
2084 }
2085 else
2086 {
2087 /* Well, the trust list at least is up to scratch... */
2088 void *reset_point = store_get(0);
2089 uschar *trusted_configs[32];
2090 int nr_configs = 0;
2091 int i = 0;
2092
2093 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2094 {
2095 uschar *start = big_buffer, *nl;
2096 while (*start && isspace(*start))
2097 start++;
2098 if (*start != '/')
2099 continue;
2100 nl = Ustrchr(start, '\n');
2101 if (nl)
2102 *nl = 0;
2103 trusted_configs[nr_configs++] = string_copy(start);
2104 if (nr_configs == 32)
2105 break;
2106 }
2107 fclose(trust_list);
2108
2109 if (nr_configs)
2110 {
2111 int sep = 0;
2112 uschar *list = argrest;
2113 uschar *filename;
2114 while (trusted_config && (filename = string_nextinlist(&list,
2115 &sep, big_buffer, big_buffer_size)) != NULL)
2116 {
2117 for (i=0; i < nr_configs; i++)
2118 {
2119 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2120 break;
2121 }
2122 if (i == nr_configs)
2123 {
2124 trusted_config = FALSE;
2125 break;
2126 }
2127 }
2128 store_reset(reset_point);
2129 }
2130 else
2131 {
2132 /* No valid prefixes found in trust_list file. */
2133 trusted_config = FALSE;
2134 }
2135 }
2136 }
2137 else
2138 {
2139 /* Could not open trust_list file. */
2140 trusted_config = FALSE;
2141 }
2142 }
2143 #else
2144 /* Not root; don't trust config */
2145 trusted_config = FALSE;
2146 #endif
2147 }
2148
2149 config_main_filelist = argrest;
2150 config_changed = TRUE;
2151 }
2152 break;
2153
2154
2155 /* -D: set up a macro definition */
2156
2157 case 'D':
2158 #ifdef DISABLE_D_OPTION
2159 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2160 exit(EXIT_FAILURE);
2161 #else
2162 {
2163 int ptr = 0;
2164 macro_item *mlast = NULL;
2165 macro_item *m;
2166 uschar name[24];
2167 uschar *s = argrest;
2168
2169 while (isspace(*s)) s++;
2170
2171 if (*s < 'A' || *s > 'Z')
2172 {
2173 fprintf(stderr, "exim: macro name set by -D must start with "
2174 "an upper case letter\n");
2175 exit(EXIT_FAILURE);
2176 }
2177
2178 while (isalnum(*s) || *s == '_')
2179 {
2180 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2181 s++;
2182 }
2183 name[ptr] = 0;
2184 if (ptr == 0) { badarg = TRUE; break; }
2185 while (isspace(*s)) s++;
2186 if (*s != 0)
2187 {
2188 if (*s++ != '=') { badarg = TRUE; break; }
2189 while (isspace(*s)) s++;
2190 }
2191
2192 for (m = macros; m != NULL; m = m->next)
2193 {
2194 if (Ustrcmp(m->name, name) == 0)
2195 {
2196 fprintf(stderr, "exim: duplicated -D in command line\n");
2197 exit(EXIT_FAILURE);
2198 }
2199 mlast = m;
2200 }
2201
2202 m = store_get(sizeof(macro_item) + Ustrlen(name));
2203 m->next = NULL;
2204 m->command_line = TRUE;
2205 if (mlast == NULL) macros = m; else mlast->next = m;
2206 Ustrcpy(m->name, name);
2207 m->replacement = string_copy(s);
2208
2209 if (clmacro_count >= MAX_CLMACROS)
2210 {
2211 fprintf(stderr, "exim: too many -D options on command line\n");
2212 exit(EXIT_FAILURE);
2213 }
2214 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2215 m->replacement);
2216 }
2217 #endif
2218 break;
2219
2220 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2221 The latter is now a no-op, retained for compatibility only. If -dd is used,
2222 debugging subprocesses of the daemon is disabled. */
2223
2224 case 'd':
2225 if (Ustrcmp(argrest, "ropcr") == 0)
2226 {
2227 /* drop_cr = TRUE; */
2228 }
2229
2230 /* Use an intermediate variable so that we don't set debugging while
2231 decoding the debugging bits. */
2232
2233 else
2234 {
2235 unsigned int selector = D_default;
2236 debug_selector = 0;
2237 debug_file = NULL;
2238 if (*argrest == 'd')
2239 {
2240 debug_daemon = TRUE;
2241 argrest++;
2242 }
2243 if (*argrest != 0)
2244 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2245 debug_options_count, US"debug", 0);
2246 debug_selector = selector;
2247 }
2248 break;
2249
2250
2251 /* -E: This is a local error message. This option is not intended for
2252 external use at all, but is not restricted to trusted callers because it
2253 does no harm (just suppresses certain error messages) and if Exim is run
2254 not setuid root it won't always be trusted when it generates error
2255 messages using this option. If there is a message id following -E, point
2256 message_reference at it, for logging. */
2257
2258 case 'E':
2259 local_error_message = TRUE;
2260 if (mac_ismsgid(argrest)) message_reference = argrest;
2261 break;
2262
2263
2264 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2265 option, so it looks as if historically the -oex options are also callable
2266 without the leading -o. So we have to accept them. Before the switch,
2267 anything starting -oe has been converted to -e. Exim does not support all
2268 of the sendmail error options. */
2269
2270 case 'e':
2271 if (Ustrcmp(argrest, "e") == 0)
2272 {
2273 arg_error_handling = ERRORS_SENDER;
2274 errors_sender_rc = EXIT_SUCCESS;
2275 }
2276 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2277 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2278 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2279 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2280 else badarg = TRUE;
2281 break;
2282
2283
2284 /* -F: Set sender's full name, used instead of the gecos entry from
2285 the password file. Since users can usually alter their gecos entries,
2286 there's no security involved in using this instead. The data can follow
2287 the -F or be in the next argument. */
2288
2289 case 'F':
2290 if (*argrest == 0)
2291 {
2292 if(++i < argc) argrest = argv[i]; else
2293 { badarg = TRUE; break; }
2294 }
2295 originator_name = argrest;
2296 sender_name_forced = TRUE;
2297 break;
2298
2299
2300 /* -f: Set sender's address - this value is only actually used if Exim is
2301 run by a trusted user, or if untrusted_set_sender is set and matches the
2302 address, except that the null address can always be set by any user. The
2303 test for this happens later, when the value given here is ignored when not
2304 permitted. For an untrusted user, the actual sender is still put in Sender:
2305 if it doesn't match the From: header (unless no_local_from_check is set).
2306 The data can follow the -f or be in the next argument. The -r switch is an
2307 obsolete form of -f but since there appear to be programs out there that
2308 use anything that sendmail has ever supported, better accept it - the
2309 synonymizing is done before the switch above.
2310
2311 At this stage, we must allow domain literal addresses, because we don't
2312 know what the setting of allow_domain_literals is yet. Ditto for trailing
2313 dots and strip_trailing_dot. */
2314
2315 case 'f':
2316 {
2317 int start, end;
2318 uschar *errmess;
2319 if (*argrest == 0)
2320 {
2321 if (i+1 < argc) argrest = argv[++i]; else
2322 { badarg = TRUE; break; }
2323 }
2324 if (*argrest == 0)
2325 {
2326 sender_address = string_sprintf(""); /* Ensure writeable memory */
2327 }
2328 else
2329 {
2330 uschar *temp = argrest + Ustrlen(argrest) - 1;
2331 while (temp >= argrest && isspace(*temp)) temp--;
2332 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2333 allow_domain_literals = TRUE;
2334 strip_trailing_dot = TRUE;
2335 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2336 &sender_address_domain, TRUE);
2337 allow_domain_literals = FALSE;
2338 strip_trailing_dot = FALSE;
2339 if (sender_address == NULL)
2340 {
2341 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2342 return EXIT_FAILURE;
2343 }
2344 }
2345 sender_address_forced = TRUE;
2346 }
2347 break;
2348
2349 /* This is some Sendmail thing which can be ignored */
2350
2351 case 'G':
2352 break;
2353
2354 /* -h: Set the hop count for an incoming message. Exim does not currently
2355 support this; it always computes it by counting the Received: headers.
2356 To put it in will require a change to the spool header file format. */
2357
2358 case 'h':
2359 if (*argrest == 0)
2360 {
2361 if(++i < argc) argrest = argv[i]; else
2362 { badarg = TRUE; break; }
2363 }
2364 if (!isdigit(*argrest)) badarg = TRUE;
2365 break;
2366
2367
2368 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2369 not to be documented for sendmail but mailx (at least) uses it) */
2370
2371 case 'i':
2372 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2373 break;
2374
2375
2376 case 'M':
2377 receiving_message = FALSE;
2378
2379 /* -MC: continue delivery of another message via an existing open
2380 file descriptor. This option is used for an internal call by the
2381 smtp transport when there is a pending message waiting to go to an
2382 address to which it has got a connection. Five subsequent arguments are
2383 required: transport name, host name, IP address, sequence number, and
2384 message_id. Transports may decline to create new processes if the sequence
2385 number gets too big. The channel is stdin. This (-MC) must be the last
2386 argument. There's a subsequent check that the real-uid is privileged.
2387
2388 If we are running in the test harness. delay for a bit, to let the process
2389 that set this one up complete. This makes for repeatability of the logging,
2390 etc. output. */
2391
2392 if (Ustrcmp(argrest, "C") == 0)
2393 {
2394 union sockaddr_46 interface_sock;
2395 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2396
2397 if (argc != i + 6)
2398 {
2399 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2400 return EXIT_FAILURE;
2401 }
2402
2403 if (msg_action_arg >= 0)
2404 {
2405 fprintf(stderr, "exim: incompatible arguments\n");
2406 return EXIT_FAILURE;
2407 }
2408
2409 continue_transport = argv[++i];
2410 continue_hostname = argv[++i];
2411 continue_host_address = argv[++i];
2412 continue_sequence = Uatoi(argv[++i]);
2413 msg_action = MSG_DELIVER;
2414 msg_action_arg = ++i;
2415 forced_delivery = TRUE;
2416 queue_run_pid = passed_qr_pid;
2417 queue_run_pipe = passed_qr_pipe;
2418
2419 if (!mac_ismsgid(argv[i]))
2420 {
2421 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2422 argv[i]);
2423 return EXIT_FAILURE;
2424 }
2425
2426 /* Set up $sending_ip_address and $sending_port */
2427
2428 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2429 &size) == 0)
2430 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2431 &sending_port);
2432 else
2433 {
2434 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2435 strerror(errno));
2436 return EXIT_FAILURE;
2437 }
2438
2439 if (running_in_test_harness) millisleep(500);
2440 break;
2441 }
2442
2443 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2444 precedes -MC (see above). The flag indicates that the host to which
2445 Exim is connected has accepted an AUTH sequence. */
2446
2447 else if (Ustrcmp(argrest, "CA") == 0)
2448 {
2449 smtp_authenticated = TRUE;
2450 break;
2451 }
2452
2453 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2454 it preceded -MC (see above) */
2455
2456 else if (Ustrcmp(argrest, "CP") == 0)
2457 {
2458 smtp_use_pipelining = TRUE;
2459 break;
2460 }
2461
2462 /* -MCQ: pass on the pid of the queue-running process that started
2463 this chain of deliveries and the fd of its synchronizing pipe; this
2464 is useful only when it precedes -MC (see above) */
2465
2466 else if (Ustrcmp(argrest, "CQ") == 0)
2467 {
2468 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2469 else badarg = TRUE;
2470 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2471 else badarg = TRUE;
2472 break;
2473 }
2474
2475 /* -MCS: set the smtp_use_size flag; this is useful only when it
2476 precedes -MC (see above) */
2477
2478 else if (Ustrcmp(argrest, "CS") == 0)
2479 {
2480 smtp_use_size = TRUE;
2481 break;
2482 }
2483
2484 /* -MCT: set the tls_offered flag; this is useful only when it
2485 precedes -MC (see above). The flag indicates that the host to which
2486 Exim is connected has offered TLS support. */
2487
2488 #ifdef SUPPORT_TLS
2489 else if (Ustrcmp(argrest, "CT") == 0)
2490 {
2491 tls_offered = TRUE;
2492 break;
2493 }
2494 #endif
2495
2496 /* -M[x]: various operations on the following list of message ids:
2497 -M deliver the messages, ignoring next retry times and thawing
2498 -Mc deliver the messages, checking next retry times, no thawing
2499 -Mf freeze the messages
2500 -Mg give up on the messages
2501 -Mt thaw the messages
2502 -Mrm remove the messages
2503 In the above cases, this must be the last option. There are also the
2504 following options which are followed by a single message id, and which
2505 act on that message. Some of them use the "recipient" addresses as well.
2506 -Mar add recipient(s)
2507 -Mmad mark all recipients delivered
2508 -Mmd mark recipients(s) delivered
2509 -Mes edit sender
2510 -Mset load a message for use with -be
2511 -Mvb show body
2512 -Mvc show copy (of whole message, in RFC 2822 format)
2513 -Mvh show header
2514 -Mvl show log
2515 */
2516
2517 else if (*argrest == 0)
2518 {
2519 msg_action = MSG_DELIVER;
2520 forced_delivery = deliver_force_thaw = TRUE;
2521 }
2522 else if (Ustrcmp(argrest, "ar") == 0)
2523 {
2524 msg_action = MSG_ADD_RECIPIENT;
2525 one_msg_action = TRUE;
2526 }
2527 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2528 else if (Ustrcmp(argrest, "es") == 0)
2529 {
2530 msg_action = MSG_EDIT_SENDER;
2531 one_msg_action = TRUE;
2532 }
2533 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2534 else if (Ustrcmp(argrest, "g") == 0)
2535 {
2536 msg_action = MSG_DELIVER;
2537 deliver_give_up = TRUE;
2538 }
2539 else if (Ustrcmp(argrest, "mad") == 0)
2540 {
2541 msg_action = MSG_MARK_ALL_DELIVERED;
2542 }
2543 else if (Ustrcmp(argrest, "md") == 0)
2544 {
2545 msg_action = MSG_MARK_DELIVERED;
2546 one_msg_action = TRUE;
2547 }
2548 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2549 else if (Ustrcmp(argrest, "set") == 0)
2550 {
2551 msg_action = MSG_LOAD;
2552 one_msg_action = TRUE;
2553 }
2554 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2555 else if (Ustrcmp(argrest, "vb") == 0)
2556 {
2557 msg_action = MSG_SHOW_BODY;
2558 one_msg_action = TRUE;
2559 }
2560 else if (Ustrcmp(argrest, "vc") == 0)
2561 {
2562 msg_action = MSG_SHOW_COPY;
2563 one_msg_action = TRUE;
2564 }
2565 else if (Ustrcmp(argrest, "vh") == 0)
2566 {
2567 msg_action = MSG_SHOW_HEADER;
2568 one_msg_action = TRUE;
2569 }
2570 else if (Ustrcmp(argrest, "vl") == 0)
2571 {
2572 msg_action = MSG_SHOW_LOG;
2573 one_msg_action = TRUE;
2574 }
2575 else { badarg = TRUE; break; }
2576
2577 /* All the -Mxx options require at least one message id. */
2578
2579 msg_action_arg = i + 1;
2580 if (msg_action_arg >= argc)
2581 {
2582 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2583 return EXIT_FAILURE;
2584 }
2585
2586 /* Some require only message ids to follow */
2587
2588 if (!one_msg_action)
2589 {
2590 int j;
2591 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2592 {
2593 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2594 argv[j], arg);
2595 return EXIT_FAILURE;
2596 }
2597 goto END_ARG; /* Remaining args are ids */
2598 }
2599
2600 /* Others require only one message id, possibly followed by addresses,
2601 which will be handled as normal arguments. */
2602
2603 else
2604 {
2605 if (!mac_ismsgid(argv[msg_action_arg]))
2606 {
2607 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2608 argv[msg_action_arg], arg);
2609 return EXIT_FAILURE;
2610 }
2611 i++;
2612 }
2613 break;
2614
2615
2616 /* Some programs seem to call the -om option without the leading o;
2617 for sendmail it askes for "me too". Exim always does this. */
2618
2619 case 'm':
2620 if (*argrest != 0) badarg = TRUE;
2621 break;
2622
2623
2624 /* -N: don't do delivery - a debugging option that stops transports doing
2625 their thing. It implies debugging at the D_v level. */
2626
2627 case 'N':
2628 if (*argrest == 0)
2629 {
2630 dont_deliver = TRUE;
2631 debug_selector |= D_v;
2632 debug_file = stderr;
2633 }
2634 else badarg = TRUE;
2635 break;
2636
2637
2638 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2639 it. */
2640
2641 case 'n':
2642 break;
2643
2644 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2645 option to the specified value. This form uses long names. We need to handle
2646 -O option=value and -Ooption=value. */
2647
2648 case 'O':
2649 if (*argrest == 0)
2650 {
2651 if (++i >= argc)
2652 {
2653 fprintf(stderr, "exim: string expected after -O\n");
2654 exit(EXIT_FAILURE);
2655 }
2656 }
2657 break;
2658
2659 case 'o':
2660
2661 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2662 file" option). */
2663
2664 if (*argrest == 'A')
2665 {
2666 alias_arg = argrest + 1;
2667 if (alias_arg[0] == 0)
2668 {
2669 if (i+1 < argc) alias_arg = argv[++i]; else
2670 {
2671 fprintf(stderr, "exim: string expected after -oA\n");
2672 exit(EXIT_FAILURE);
2673 }
2674 }
2675 }
2676
2677 /* -oB: Set a connection message max value for remote deliveries */
2678
2679 else if (*argrest == 'B')
2680 {
2681 uschar *p = argrest + 1;
2682 if (p[0] == 0)
2683 {
2684 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2685 {
2686 connection_max_messages = 1;
2687 p = NULL;
2688 }
2689 }
2690
2691 if (p != NULL)
2692 {
2693 if (!isdigit(*p))
2694 {
2695 fprintf(stderr, "exim: number expected after -oB\n");
2696 exit(EXIT_FAILURE);
2697 }
2698 connection_max_messages = Uatoi(p);
2699 }
2700 }
2701
2702 /* -odb: background delivery */
2703
2704 else if (Ustrcmp(argrest, "db") == 0)
2705 {
2706 synchronous_delivery = FALSE;
2707 arg_queue_only = FALSE;
2708 queue_only_set = TRUE;
2709 }
2710
2711 /* -odf: foreground delivery (smail-compatible option); same effect as
2712 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2713 */
2714
2715 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2716 {
2717 synchronous_delivery = TRUE;
2718 arg_queue_only = FALSE;
2719 queue_only_set = TRUE;
2720 }
2721
2722 /* -odq: queue only */
2723
2724 else if (Ustrcmp(argrest, "dq") == 0)
2725 {
2726 synchronous_delivery = FALSE;
2727 arg_queue_only = TRUE;
2728 queue_only_set = TRUE;
2729 }
2730
2731 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2732 but no remote delivery */
2733
2734 else if (Ustrcmp(argrest, "dqs") == 0)
2735 {
2736 queue_smtp = TRUE;
2737 arg_queue_only = FALSE;
2738 queue_only_set = TRUE;
2739 }
2740
2741 /* -oex: Sendmail error flags. As these are also accepted without the
2742 leading -o prefix, for compatibility with vacation and other callers,
2743 they are handled with -e above. */
2744
2745 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2746 -oitrue: Another sendmail syntax for the same */
2747
2748 else if (Ustrcmp(argrest, "i") == 0 ||
2749 Ustrcmp(argrest, "itrue") == 0)
2750 dot_ends = FALSE;
2751
2752 /* -oM*: Set various characteristics for an incoming message; actually
2753 acted on for trusted callers only. */
2754
2755 else if (*argrest == 'M')
2756 {
2757 if (i+1 >= argc)
2758 {
2759 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2760 exit(EXIT_FAILURE);
2761 }
2762
2763 /* -oMa: Set sender host address */
2764
2765 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2766
2767 /* -oMaa: Set authenticator name */
2768
2769 else if (Ustrcmp(argrest, "Maa") == 0)
2770 sender_host_authenticated = argv[++i];
2771
2772 /* -oMas: setting authenticated sender */
2773
2774 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2775
2776 /* -oMai: setting authenticated id */
2777
2778 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2779
2780 /* -oMi: Set incoming interface address */
2781
2782 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2783
2784 /* -oMr: Received protocol */
2785
2786 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2787
2788 /* -oMs: Set sender host name */
2789
2790 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2791
2792 /* -oMt: Set sender ident */
2793
2794 else if (Ustrcmp(argrest, "Mt") == 0)
2795 {
2796 sender_ident_set = TRUE;
2797 sender_ident = argv[++i];
2798 }
2799
2800 /* Else a bad argument */
2801
2802 else
2803 {
2804 badarg = TRUE;
2805 break;
2806 }
2807 }
2808
2809 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2810 seem to call this as -m (undocumented), so that is also accepted (see
2811 above). */
2812
2813 else if (Ustrcmp(argrest, "m") == 0) {}
2814
2815 /* -oo: An ancient flag for old-style addresses which still seems to
2816 crop up in some calls (see in SCO). */
2817
2818 else if (Ustrcmp(argrest, "o") == 0) {}
2819
2820 /* -oP <name>: set pid file path for daemon */
2821
2822 else if (Ustrcmp(argrest, "P") == 0)
2823 override_pid_file_path = argv[++i];
2824
2825 /* -or <n>: set timeout for non-SMTP acceptance
2826 -os <n>: set timeout for SMTP acceptance */
2827
2828 else if (*argrest == 'r' || *argrest == 's')
2829 {
2830 int *tp = (*argrest == 'r')?
2831 &arg_receive_timeout : &arg_smtp_receive_timeout;
2832 if (argrest[1] == 0)
2833 {
2834 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2835 }
2836 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2837 if (*tp < 0)
2838 {
2839 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2840 exit(EXIT_FAILURE);
2841 }
2842 }
2843
2844 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2845
2846 else if (Ustrcmp(argrest, "X") == 0)
2847 override_local_interfaces = argv[++i];
2848
2849 /* Unknown -o argument */
2850
2851 else badarg = TRUE;
2852 break;
2853
2854
2855 /* -ps: force Perl startup; -pd force delayed Perl startup */
2856
2857 case 'p':
2858 #ifdef EXIM_PERL
2859 if (*argrest == 's' && argrest[1] == 0)
2860 {
2861 perl_start_option = 1;
2862 break;
2863 }
2864 if (*argrest == 'd' && argrest[1] == 0)
2865 {
2866 perl_start_option = -1;
2867 break;
2868 }
2869 #endif
2870
2871 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2872 which sets the host protocol and host name */
2873
2874 if (*argrest == 0)
2875 {
2876 if (i+1 < argc) argrest = argv[++i]; else
2877 { badarg = TRUE; break; }
2878 }
2879
2880 if (*argrest != 0)
2881 {
2882 uschar *hn = Ustrchr(argrest, ':');
2883 if (hn == NULL)
2884 {
2885 received_protocol = argrest;
2886 }
2887 else
2888 {
2889 received_protocol = string_copyn(argrest, hn - argrest);
2890 sender_host_name = hn + 1;
2891 }
2892 }
2893 break;
2894
2895
2896 case 'q':
2897 receiving_message = FALSE;
2898 if (queue_interval >= 0)
2899 {
2900 fprintf(stderr, "exim: -q specified more than once\n");
2901 exit(EXIT_FAILURE);
2902 }
2903
2904 /* -qq...: Do queue runs in a 2-stage manner */
2905
2906 if (*argrest == 'q')
2907 {
2908 queue_2stage = TRUE;
2909 argrest++;
2910 }
2911
2912 /* -qi...: Do only first (initial) deliveries */
2913
2914 if (*argrest == 'i')
2915 {
2916 queue_run_first_delivery = TRUE;
2917 argrest++;
2918 }
2919
2920 /* -qf...: Run the queue, forcing deliveries
2921 -qff..: Ditto, forcing thawing as well */
2922
2923 if (*argrest == 'f')
2924 {
2925 queue_run_force = TRUE;
2926 if (*(++argrest) == 'f')
2927 {
2928 deliver_force_thaw = TRUE;
2929 argrest++;
2930 }
2931 }
2932
2933 /* -q[f][f]l...: Run the queue only on local deliveries */
2934
2935 if (*argrest == 'l')
2936 {
2937 queue_run_local = TRUE;
2938 argrest++;
2939 }
2940
2941 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2942 optionally starting from a given message id. */
2943
2944 if (*argrest == 0 &&
2945 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2946 {
2947 queue_interval = 0;
2948 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2949 start_queue_run_id = argv[++i];
2950 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2951 stop_queue_run_id = argv[++i];
2952 }
2953
2954 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2955 optionally local only. */
2956
2957 else
2958 {
2959 if (*argrest != 0)
2960 queue_interval = readconf_readtime(argrest, 0, FALSE);
2961 else
2962 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2963 if (queue_interval <= 0)
2964 {
2965 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2966 exit(EXIT_FAILURE);
2967 }
2968 }
2969 break;
2970
2971
2972 case 'R': /* Synonymous with -qR... */
2973 receiving_message = FALSE;
2974
2975 /* -Rf: As -R (below) but force all deliveries,
2976 -Rff: Ditto, but also thaw all frozen messages,
2977 -Rr: String is regex
2978 -Rrf: Regex and force
2979 -Rrff: Regex and force and thaw
2980
2981 in all cases provided there are no further characters in this
2982 argument. */
2983
2984 if (*argrest != 0)
2985 {
2986 int i;
2987 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2988 {
2989 if (Ustrcmp(argrest, rsopts[i]) == 0)
2990 {
2991 if (i != 2) queue_run_force = TRUE;
2992 if (i >= 2) deliver_selectstring_regex = TRUE;
2993 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2994 argrest += Ustrlen(rsopts[i]);
2995 }
2996 }
2997 }
2998
2999 /* -R: Set string to match in addresses for forced queue run to
3000 pick out particular messages. */
3001
3002 if (*argrest == 0)
3003 {
3004 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3005 {
3006 fprintf(stderr, "exim: string expected after -R\n");
3007 exit(EXIT_FAILURE);
3008 }
3009 }
3010 else deliver_selectstring = argrest;
3011 break;
3012
3013
3014 /* -r: an obsolete synonym for -f (see above) */
3015
3016
3017 /* -S: Like -R but works on sender. */
3018
3019 case 'S': /* Synonymous with -qS... */
3020 receiving_message = FALSE;
3021
3022 /* -Sf: As -S (below) but force all deliveries,
3023 -Sff: Ditto, but also thaw all frozen messages,
3024 -Sr: String is regex
3025 -Srf: Regex and force
3026 -Srff: Regex and force and thaw
3027
3028 in all cases provided there are no further characters in this
3029 argument. */
3030
3031 if (*argrest != 0)
3032 {
3033 int i;
3034 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3035 {
3036 if (Ustrcmp(argrest, rsopts[i]) == 0)
3037 {
3038 if (i != 2) queue_run_force = TRUE;
3039 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3040 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3041 argrest += Ustrlen(rsopts[i]);
3042 }
3043 }
3044 }
3045
3046 /* -S: Set string to match in addresses for forced queue run to
3047 pick out particular messages. */
3048
3049 if (*argrest == 0)
3050 {
3051 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3052 {
3053 fprintf(stderr, "exim: string expected after -S\n");
3054 exit(EXIT_FAILURE);
3055 }
3056 }
3057 else deliver_selectstring_sender = argrest;
3058 break;
3059
3060 /* -Tqt is an option that is exclusively for use by the testing suite.
3061 It is not recognized in other circumstances. It allows for the setting up
3062 of explicit "queue times" so that various warning/retry things can be
3063 tested. Otherwise variability of clock ticks etc. cause problems. */
3064
3065 case 'T':
3066 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3067 fudged_queue_times = argv[++i];
3068 else badarg = TRUE;
3069 break;
3070
3071
3072 /* -t: Set flag to extract recipients from body of message. */
3073
3074 case 't':
3075 if (*argrest == 0) extract_recipients = TRUE;
3076
3077 /* -ti: Set flag to extract recipients from body of message, and also
3078 specify that dot does not end the message. */
3079
3080 else if (Ustrcmp(argrest, "i") == 0)
3081 {
3082 extract_recipients = TRUE;
3083 dot_ends = FALSE;
3084 }
3085
3086 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3087
3088 #ifdef SUPPORT_TLS
3089 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
3090 #endif
3091
3092 else badarg = TRUE;
3093 break;
3094
3095
3096 /* -U: This means "initial user submission" in sendmail, apparently. The
3097 doc claims that in future sendmail may refuse syntactically invalid
3098 messages instead of fixing them. For the moment, we just ignore it. */
3099
3100 case 'U':
3101 break;
3102
3103
3104 /* -v: verify things - this is a very low-level debugging */
3105
3106 case 'v':
3107 if (*argrest == 0)
3108 {
3109 debug_selector |= D_v;
3110 debug_file = stderr;
3111 }
3112 else badarg = TRUE;
3113 break;
3114
3115
3116 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3117
3118 The -x flag tells the sendmail command that mail from a local
3119 mail program has National Language Support (NLS) extended characters
3120 in the body of the mail item. The sendmail command can send mail with
3121 extended NLS characters across networks that normally corrupts these
3122 8-bit characters.
3123
3124 As Exim is 8-bit clean, it just ignores this flag. */
3125
3126 case 'x':
3127 if (*argrest != 0) badarg = TRUE;
3128 break;
3129
3130 /* All other initial characters are errors */
3131
3132 default:
3133 badarg = TRUE;
3134 break;
3135 } /* End of high-level switch statement */
3136
3137 /* Failed to recognize the option, or syntax error */
3138
3139 if (badarg)
3140 {
3141 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3142 "option %s\n", arg);
3143 exit(EXIT_FAILURE);
3144 }
3145 }
3146
3147
3148 /* If -R or -S have been specified without -q, assume a single queue run. */
3149
3150 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3151 queue_interval < 0) queue_interval = 0;
3152
3153
3154 END_ARG:
3155 /* If usage_wanted is set we call the usage function - which never returns */
3156 if (usage_wanted) exim_usage(called_as);
3157
3158 /* Arguments have been processed. Check for incompatibilities. */
3159 if ((
3160 (smtp_input || extract_recipients || recipients_arg < argc) &&
3161 (daemon_listen || queue_interval >= 0 || bi_option ||
3162 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3163 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3164 ) ||
3165 (
3166 msg_action_arg > 0 &&
3167 (daemon_listen || queue_interval >= 0 || list_options ||
3168 (checking && msg_action != MSG_LOAD) ||
3169 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3170 ) ||
3171 (
3172 (daemon_listen || queue_interval >= 0) &&
3173 (sender_address != NULL || list_options || list_queue || checking ||
3174 bi_option)
3175 ) ||
3176 (
3177 daemon_listen && queue_interval == 0
3178 ) ||
3179 (
3180 list_options &&
3181 (checking || smtp_input || extract_recipients ||
3182 filter_test != FTEST_NONE || bi_option)
3183 ) ||
3184 (
3185 verify_address_mode &&
3186 (address_test_mode || smtp_input || extract_recipients ||
3187 filter_test != FTEST_NONE || bi_option)
3188 ) ||
3189 (
3190 address_test_mode && (smtp_input || extract_recipients ||
3191 filter_test != FTEST_NONE || bi_option)
3192 ) ||
3193 (
3194 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3195 extract_recipients)
3196 ) ||
3197 (
3198 deliver_selectstring != NULL && queue_interval < 0
3199 ) ||
3200 (
3201 msg_action == MSG_LOAD &&
3202 (!expansion_test || expansion_test_message != NULL)
3203 )
3204 )
3205 {
3206 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3207 exit(EXIT_FAILURE);
3208 }
3209
3210 /* If debugging is set up, set the file and the file descriptor to pass on to
3211 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3212 to run in the foreground. */
3213
3214 if (debug_selector != 0)
3215 {
3216 debug_file = stderr;
3217 debug_fd = fileno(debug_file);
3218 background_daemon = FALSE;
3219 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3220 if (debug_selector != D_v) /* -v only doesn't show this */
3221 {
3222 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3223 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3224 debug_selector);
3225 if (!version_printed)
3226 show_whats_supported(stderr);
3227 }
3228 }
3229
3230 /* When started with root privilege, ensure that the limits on the number of
3231 open files and the number of processes (where that is accessible) are
3232 sufficiently large, or are unset, in case Exim has been called from an
3233 environment where the limits are screwed down. Not all OS have the ability to
3234 change some of these limits. */
3235
3236 if (unprivileged)
3237 {
3238 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3239 }
3240 else
3241 {
3242 struct rlimit rlp;
3243
3244 #ifdef RLIMIT_NOFILE
3245 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3246 {
3247 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3248 strerror(errno));
3249 rlp.rlim_cur = rlp.rlim_max = 0;
3250 }
3251
3252 /* I originally chose 1000 as a nice big number that was unlikely to
3253 be exceeded. It turns out that some older OS have a fixed upper limit of
3254 256. */
3255
3256 if (rlp.rlim_cur < 1000)
3257 {
3258 rlp.rlim_cur = rlp.rlim_max = 1000;
3259 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3260 {
3261 rlp.rlim_cur = rlp.rlim_max = 256;
3262 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3263 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3264 strerror(errno));
3265 }
3266 }
3267 #endif
3268
3269 #ifdef RLIMIT_NPROC
3270 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3271 {
3272 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3273 strerror(errno));
3274 rlp.rlim_cur = rlp.rlim_max = 0;
3275 }
3276
3277 #ifdef RLIM_INFINITY
3278 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3279 {
3280 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3281 #else
3282 if (rlp.rlim_cur < 1000)
3283 {
3284 rlp.rlim_cur = rlp.rlim_max = 1000;
3285 #endif
3286 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3287 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3288 strerror(errno));
3289 }
3290 #endif
3291 }
3292
3293 /* Exim is normally entered as root (but some special configurations are
3294 possible that don't do this). However, it always spins off sub-processes that
3295 set their uid and gid as required for local delivery. We don't want to pass on
3296 any extra groups that root may belong to, so we want to get rid of them all at
3297 this point.
3298
3299 We need to obey setgroups() at this stage, before possibly giving up root
3300 privilege for a changed configuration file, but later on we might need to
3301 check on the additional groups for the admin user privilege - can't do that
3302 till after reading the config, which might specify the exim gid. Therefore,
3303 save the group list here first. */
3304
3305 group_count = getgroups(NGROUPS_MAX, group_list);
3306 if (group_count < 0)
3307 {
3308 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3309 exit(EXIT_FAILURE);
3310 }
3311
3312 /* There is a fundamental difference in some BSD systems in the matter of
3313 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3314 known not to be different. On the "different" systems there is a single group
3315 list, and the first entry in it is the current group. On all other versions of
3316 Unix there is a supplementary group list, which is in *addition* to the current
3317 group. Consequently, to get rid of all extraneous groups on a "standard" system
3318 you pass over 0 groups to setgroups(), while on a "different" system you pass
3319 over a single group - the current group, which is always the first group in the
3320 list. Calling setgroups() with zero groups on a "different" system results in
3321 an error return. The following code should cope with both types of system.
3322
3323 However, if this process isn't running as root, setgroups() can't be used
3324 since you have to be root to run it, even if throwing away groups. Not being
3325 root here happens only in some unusual configurations. We just ignore the
3326 error. */
3327
3328 if (setgroups(0, NULL) != 0)
3329 {
3330 if (setgroups(1, group_list) != 0 && !unprivileged)
3331 {
3332 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3333 exit(EXIT_FAILURE);
3334 }
3335 }
3336
3337 /* If the configuration file name has been altered by an argument on the
3338 command line (either a new file name or a macro definition) and the caller is
3339 not root, or if this is a filter testing run, remove any setuid privilege the
3340 program has and run as the underlying user.
3341
3342 The exim user is locked out of this, which severely restricts the use of -C
3343 for some purposes.
3344
3345 Otherwise, set the real ids to the effective values (should be root unless run
3346 from inetd, which it can either be root or the exim uid, if one is configured).
3347
3348 There is a private mechanism for bypassing some of this, in order to make it
3349 possible to test lots of configurations automatically, without having either to
3350 recompile each time, or to patch in an actual configuration file name and other
3351 values (such as the path name). If running in the test harness, pretend that
3352 configuration file changes and macro definitions haven't happened. */
3353
3354 if (( /* EITHER */
3355 (!trusted_config || /* Config changed, or */
3356 !macros_trusted()) && /* impermissible macros and */
3357 real_uid != root_uid && /* Not root, and */
3358 !running_in_test_harness /* Not fudged */
3359 ) || /* OR */
3360 expansion_test /* expansion testing */
3361 || /* OR */
3362 filter_test != FTEST_NONE) /* Filter testing */
3363 {
3364 setgroups(group_count, group_list);
3365 exim_setugid(real_uid, real_gid, FALSE,
3366 US"-C, -D, -be or -bf forces real uid");
3367 removed_privilege = TRUE;
3368
3369 /* In the normal case when Exim is called like this, stderr is available
3370 and should be used for any logging information because attempts to write
3371 to the log will usually fail. To arrange this, we unset really_exim. However,
3372 if no stderr is available there is no point - we might as well have a go
3373 at the log (if it fails, syslog will be written).
3374
3375 Note that if the invoker is Exim, the logs remain available. Messing with
3376 this causes unlogged successful deliveries. */
3377
3378 if ((log_stderr != NULL) && (real_uid != exim_uid))
3379 really_exim = FALSE;
3380 }
3381
3382 /* Privilege is to be retained for the moment. It may be dropped later,
3383 depending on the job that this Exim process has been asked to do. For now, set
3384 the real uid to the effective so that subsequent re-execs of Exim are done by a
3385 privileged user. */
3386
3387 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3388
3389 /* If testing a filter, open the file(s) now, before wasting time doing other
3390 setups and reading the message. */
3391
3392 if ((filter_test & FTEST_SYSTEM) != 0)
3393 {
3394 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3395 if (filter_sfd < 0)
3396 {
3397 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3398 strerror(errno));
3399 return EXIT_FAILURE;
3400 }
3401 }
3402
3403 if ((filter_test & FTEST_USER) != 0)
3404 {
3405 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3406 if (filter_ufd < 0)
3407 {
3408 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3409 strerror(errno));
3410 return EXIT_FAILURE;
3411 }
3412 }
3413
3414 /* Read the main runtime configuration data; this gives up if there
3415 is a failure. It leaves the configuration file open so that the subsequent
3416 configuration data for delivery can be read if needed. */
3417
3418 readconf_main();
3419
3420 /* Handle the decoding of logging options. */
3421
3422 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3423 log_selector_string, log_options, log_options_count, US"log", 0);
3424
3425 DEBUG(D_any)
3426 {
3427 debug_printf("configuration file is %s\n", config_main_filename);
3428 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3429 log_extra_selector);
3430 }
3431
3432 /* If domain literals are not allowed, check the sender address that was
3433 supplied with -f. Ditto for a stripped trailing dot. */
3434
3435 if (sender_address != NULL)
3436 {
3437 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3438 {
3439 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3440 "allowed\n", sender_address);
3441 return EXIT_FAILURE;
3442 }
3443 if (f_end_dot && !strip_trailing_dot)
3444 {
3445 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3446 "(trailing dot not allowed)\n", sender_address);
3447 return EXIT_FAILURE;
3448 }
3449 }
3450
3451 /* Paranoia check of maximum lengths of certain strings. There is a check
3452 on the length of the log file path in log.c, which will come into effect
3453 if there are any calls to write the log earlier than this. However, if we
3454 get this far but the string is very long, it is better to stop now than to
3455 carry on and (e.g.) receive a message and then have to collapse. The call to
3456 log_write() from here will cause the ultimate panic collapse if the complete
3457 file name exceeds the buffer length. */
3458
3459 if (Ustrlen(log_file_path) > 200)
3460 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3461 "log_file_path is longer than 200 chars: aborting");
3462
3463 if (Ustrlen(pid_file_path) > 200)
3464 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3465 "pid_file_path is longer than 200 chars: aborting");
3466
3467 if (Ustrlen(spool_directory) > 200)
3468 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3469 "spool_directory is longer than 200 chars: aborting");
3470
3471 /* Length check on the process name given to syslog for its TAG field,
3472 which is only permitted to be 32 characters or less. See RFC 3164. */
3473
3474 if (Ustrlen(syslog_processname) > 32)
3475 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3476 "syslog_processname is longer than 32 chars: aborting");
3477
3478 /* In some operating systems, the environment variable TMPDIR controls where
3479 temporary files are created; Exim doesn't use these (apart from when delivering
3480 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3481 If TMPDIR is found in the environment, reset it to the value defined in the
3482 TMPDIR macro, if this macro is defined. */
3483
3484 #ifdef TMPDIR
3485 {
3486 uschar **p;
3487 for (p = USS environ; *p != NULL; p++)
3488 {
3489 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3490 Ustrcmp(*p+7, TMPDIR) != 0)
3491 {
3492 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3493 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3494 *p = newp;
3495 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3496 }
3497 }
3498 }
3499 #endif
3500
3501 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3502 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3503 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3504 called by a user who has set the TZ variable. This then affects the timestamps
3505 in log files and in Received: headers, and any created Date: header lines. The
3506 required timezone is settable in the configuration file, so nothing can be done
3507 about this earlier - but hopefully nothing will normally be logged earlier than
3508 this. We have to make a new environment if TZ is wrong, but don't bother if
3509 timestamps_utc is set, because then all times are in UTC anyway. */
3510
3511 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3512 {
3513 timestamps_utc = TRUE;
3514 }
3515 else
3516 {
3517 uschar *envtz = US getenv("TZ");
3518 if ((envtz == NULL && timezone_string != NULL) ||
3519 (envtz != NULL &&
3520 (timezone_string == NULL ||
3521 Ustrcmp(timezone_string, envtz) != 0)))
3522 {
3523 uschar **p = USS environ;
3524 uschar **new;
3525 uschar **newp;
3526 int count = 0;
3527 while (*p++ != NULL) count++;
3528 if (envtz == NULL) count++;
3529 newp = new = malloc(sizeof(uschar *) * (count + 1));
3530 for (p = USS environ; *p != NULL; p++)
3531 {
3532 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3533 *newp++ = *p;
3534 }
3535 if (timezone_string != NULL)
3536 {
3537 *newp = malloc(Ustrlen(timezone_string) + 4);
3538 sprintf(CS *newp++, "TZ=%s", timezone_string);
3539 }
3540 *newp = NULL;
3541 environ = CSS new;
3542 tzset();
3543 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3544 tod_stamp(tod_log));
3545 }
3546 }
3547
3548 /* Handle the case when we have removed the setuid privilege because of -C or
3549 -D. This means that the caller of Exim was not root.
3550
3551 There is a problem if we were running as the Exim user. The sysadmin may
3552 expect this case to retain privilege because "the binary was called by the
3553 Exim user", but it hasn't, because either the -D option set macros, or the
3554 -C option set a non-trusted configuration file. There are two possibilities:
3555
3556 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3557 to do message deliveries. Thus, the fact that it is running as a
3558 non-privileged user is plausible, and might be wanted in some special
3559 configurations. However, really_exim will have been set false when
3560 privilege was dropped, to stop Exim trying to write to its normal log
3561 files. Therefore, re-enable normal log processing, assuming the sysadmin
3562 has set up the log directory correctly.
3563
3564 (2) If deliver_drop_privilege is not set, the configuration won't work as
3565 apparently intended, and so we log a panic message. In order to retain
3566 root for -C or -D, the caller must either be root or be invoking a
3567 trusted configuration file (when deliver_drop_privilege is false). */
3568
3569 if (removed_privilege && (!trusted_config || macros != NULL) &&
3570 real_uid == exim_uid)
3571 {
3572 if (deliver_drop_privilege)
3573 really_exim = TRUE; /* let logging work normally */
3574 else
3575 log_write(0, LOG_MAIN|LOG_PANIC,
3576 "exim user lost privilege for using %s option",
3577 trusted_config? "-D" : "-C");
3578 }
3579
3580 /* Start up Perl interpreter if Perl support is configured and there is a
3581 perl_startup option, and the configuration or the command line specifies
3582 initializing starting. Note that the global variables are actually called
3583 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3584
3585 #ifdef EXIM_PERL
3586 if (perl_start_option != 0)
3587 opt_perl_at_start = (perl_start_option > 0);
3588 if (opt_perl_at_start && opt_perl_startup != NULL)
3589 {
3590 uschar *errstr;
3591 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3592 errstr = init_perl(opt_perl_startup);
3593 if (errstr != NULL)
3594 {
3595 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3596 return EXIT_FAILURE;
3597 }
3598 opt_perl_started = TRUE;
3599 }
3600 #endif /* EXIM_PERL */
3601
3602 /* Initialise lookup_list
3603 If debugging, already called above via version reporting.
3604 This does mean that debugging causes the list to be initialised while root.
3605 This *should* be harmless -- all modules are loaded from a fixed dir and
3606 it's code that would, if not a module, be part of Exim already. */
3607 init_lookup_list();
3608
3609 /* Log the arguments of the call if the configuration file said so. This is
3610 a debugging feature for finding out what arguments certain MUAs actually use.
3611 Don't attempt it if logging is disabled, or if listing variables or if
3612 verifying/testing addresses or expansions. */
3613
3614 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3615 && really_exim && !list_options && !checking)
3616 {
3617 int i;
3618 uschar *p = big_buffer;
3619 Ustrcpy(p, "cwd=");
3620 (void)getcwd(CS p+4, big_buffer_size - 4);
3621 while (*p) p++;
3622 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3623 while (*p) p++;
3624 for (i = 0; i < argc; i++)
3625 {
3626 int len = Ustrlen(argv[i]);
3627 uschar *printing;
3628 uschar *quote;
3629 if (p + len + 8 >= big_buffer + big_buffer_size)
3630 {
3631 Ustrcpy(p, " ...");
3632 log_write(0, LOG_MAIN, "%s", big_buffer);
3633 Ustrcpy(big_buffer, "...");
3634 p = big_buffer + 3;
3635 }
3636 printing = string_printing(argv[i]);
3637 if (printing[0] == 0) quote = US"\""; else
3638 {
3639 uschar *pp = printing;
3640 quote = US"";
3641 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3642 }
3643 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3644 (p - big_buffer) - 4), printing, quote);
3645 while (*p) p++;
3646 }
3647
3648 if ((log_extra_selector & LX_arguments) != 0)
3649 log_write(0, LOG_MAIN, "%s", big_buffer);
3650 else
3651 debug_printf("%s\n", big_buffer);
3652 }
3653
3654 /* Set the working directory to be the top-level spool directory. We don't rely
3655 on this in the code, which always uses fully qualified names, but it's useful
3656 for core dumps etc. Don't complain if it fails - the spool directory might not
3657 be generally accessible and calls with the -C option (and others) have lost
3658 privilege by now. Before the chdir, we try to ensure that the directory exists.
3659 */
3660
3661 if (Uchdir(spool_directory) != 0)
3662 {
3663 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3664 (void)Uchdir(spool_directory);
3665 }
3666
3667 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3668 alias file. Exim doesn't have such a concept, but this call is screwed into
3669 Sun's YP makefiles. Handle this by calling a configured script, as the real
3670 user who called Exim. The -oA option can be used to pass an argument to the
3671 script. */
3672
3673 if (bi_option)
3674 {
3675 (void)fclose(config_file);
3676 if (bi_command != NULL)
3677 {
3678 int i = 0;
3679 uschar *argv[3];
3680 argv[i++] = bi_command;
3681 if (alias_arg != NULL) argv[i++] = alias_arg;
3682 argv[i++] = NULL;
3683
3684 setgroups(group_count, group_list);
3685 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3686
3687 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3688 (argv[1] == NULL)? US"" : argv[1]);
3689
3690 execv(CS argv[0], (char *const *)argv);
3691 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3692 exit(EXIT_FAILURE);
3693 }
3694 else
3695 {
3696 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3697 exit(EXIT_SUCCESS);
3698 }
3699 }
3700
3701 /* If an action on specific messages is requested, or if a daemon or queue
3702 runner is being started, we need to know if Exim was called by an admin user.
3703 This is the case if the real user is root or exim, or if the real group is
3704 exim, or if one of the supplementary groups is exim or a group listed in
3705 admin_groups. We don't fail all message actions immediately if not admin_user,
3706 since some actions can be performed by non-admin users. Instead, set admin_user
3707 for later interrogation. */
3708
3709 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3710 admin_user = TRUE;
3711 else
3712 {
3713 int i, j;
3714 for (i = 0; i < group_count; i++)
3715 {
3716 if (group_list[i] == exim_gid) admin_user = TRUE;
3717 else if (admin_groups != NULL)
3718 {
3719 for (j = 1; j <= (int)(admin_groups[0]); j++)
3720 if (admin_groups[j] == group_list[i])
3721 { admin_user = TRUE; break; }
3722 }
3723 if (admin_user) break;
3724 }
3725 }
3726
3727 /* Another group of privileged users are the trusted users. These are root,
3728 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3729 are permitted to specify sender_addresses with -f on the command line, and
3730 other message parameters as well. */
3731
3732 if (real_uid == root_uid || real_uid == exim_uid)
3733 trusted_caller = TRUE;
3734 else
3735 {
3736 int i, j;
3737
3738 if (trusted_users != NULL)
3739 {
3740 for (i = 1; i <= (int)(trusted_users[0]); i++)
3741 if (trusted_users[i] == real_uid)
3742 { trusted_caller = TRUE; break; }
3743 }
3744
3745 if (!trusted_caller && trusted_groups != NULL)
3746 {
3747 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3748 {
3749 if (trusted_groups[i] == real_gid)
3750 trusted_caller = TRUE;
3751 else for (j = 0; j < group_count; j++)
3752 {
3753 if (trusted_groups[i] == group_list[j])
3754 { trusted_caller = TRUE; break; }
3755 }
3756 if (trusted_caller) break;
3757 }
3758 }
3759 }
3760
3761 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3762 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3763
3764 /* Only an admin user may start the daemon or force a queue run in the default
3765 configuration, but the queue run restriction can be relaxed. Only an admin
3766 user may request that a message be returned to its sender forthwith. Only an
3767 admin user may specify a debug level greater than D_v (because it might show
3768 passwords, etc. in lookup queries). Only an admin user may request a queue
3769 count. Only an admin user can use the test interface to scan for email
3770 (because Exim will be in the spool dir and able to look at mails). */
3771
3772 if (!admin_user)
3773 {
3774 BOOL debugset = (debug_selector & ~D_v) != 0;
3775 if (deliver_give_up || daemon_listen || malware_test_file ||
3776 (count_queue && queue_list_requires_admin) ||
3777 (list_queue && queue_list_requires_admin) ||
3778 (queue_interval >= 0 && prod_requires_admin) ||
3779 (debugset && !running_in_test_harness))
3780 {
3781 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3782 exit(EXIT_FAILURE);
3783 }
3784 }
3785
3786 /* If the real user is not root or the exim uid, the argument for passing
3787 in an open TCP/IP connection for another message is not permitted, nor is
3788 running with the -N option for any delivery action, unless this call to exim is
3789 one that supplied an input message, or we are using a patched exim for
3790 regression testing. */
3791
3792 if (real_uid != root_uid && real_uid != exim_uid &&
3793 (continue_hostname != NULL ||
3794 (dont_deliver &&
3795 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3796 )) && !running_in_test_harness)
3797 {
3798 fprintf(stderr, "exim: Permission denied\n");
3799 return EXIT_FAILURE;
3800 }
3801
3802 /* If the caller is not trusted, certain arguments are ignored when running for
3803 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3804 Note that authority for performing certain actions on messages is tested in the
3805 queue_action() function. */
3806
3807 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3808 {
3809 sender_host_name = sender_host_address = interface_address =
3810 sender_ident = received_protocol = NULL;
3811 sender_host_port = interface_port = 0;
3812 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3813 }
3814
3815 /* If a sender host address is set, extract the optional port number off the
3816 end of it and check its syntax. Do the same thing for the interface address.
3817 Exim exits if the syntax is bad. */
3818
3819 else
3820 {
3821 if (sender_host_address != NULL)
3822 sender_host_port = check_port(sender_host_address);
3823 if (interface_address != NULL)
3824 interface_port = check_port(interface_address);
3825 }
3826
3827 /* If an SMTP message is being received check to see if the standard input is a
3828 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3829 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3830 barf. */
3831
3832 if (smtp_input)
3833 {
3834 union sockaddr_46 inetd_sock;
3835 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3836 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3837 {
3838 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3839 if (family == AF_INET || family == AF_INET6)
3840 {
3841 union sockaddr_46 interface_sock;
3842 size = sizeof(interface_sock);
3843
3844 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3845 interface_address = host_ntoa(-1, &interface_sock, NULL,
3846 &interface_port);
3847
3848 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3849
3850 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3851 {
3852 is_inetd = TRUE;
3853 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3854 NULL, &sender_host_port);
3855 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3856 "inetd is not supported when mua_wrapper is set");
3857 }
3858 else
3859 {
3860 fprintf(stderr,
3861 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3862 return EXIT_FAILURE;
3863 }
3864 }
3865 }
3866 }
3867
3868 /* If the load average is going to be needed while receiving a message, get it
3869 now for those OS that require the first call to os_getloadavg() to be done as
3870 root. There will be further calls later for each message received. */
3871
3872 #ifdef LOAD_AVG_NEEDS_ROOT
3873 if (receiving_message &&
3874 (queue_only_load >= 0 ||
3875 (is_inetd && smtp_load_reserve >= 0)
3876 ))
3877 {
3878 load_average = OS_GETLOADAVG();
3879 }
3880 #endif
3881
3882 /* The queue_only configuration option can be overridden by -odx on the command
3883 line, except that if queue_only_override is false, queue_only cannot be unset
3884 from the command line. */
3885
3886 if (queue_only_set && (queue_only_override || arg_queue_only))
3887 queue_only = arg_queue_only;
3888
3889 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3890 -or and -os. */
3891
3892 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3893 if (arg_smtp_receive_timeout >= 0)
3894 smtp_receive_timeout = arg_smtp_receive_timeout;
3895
3896 /* If Exim was started with root privilege, unless we have already removed the
3897 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3898 except when starting the daemon or doing some kind of delivery or address
3899 testing (-bt). These are the only cases when root need to be retained. We run
3900 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3901 retained only for starting the daemon. We always do the initgroups() in this
3902 situation (controlled by the TRUE below), in order to be as close as possible
3903 to the state Exim usually runs in. */
3904
3905 if (!unprivileged && /* originally had root AND */
3906 !removed_privilege && /* still got root AND */
3907 !daemon_listen && /* not starting the daemon */
3908 queue_interval <= 0 && /* (either kind of daemon) */
3909 ( /* AND EITHER */
3910 deliver_drop_privilege || /* requested unprivileged */
3911 ( /* OR */
3912 queue_interval < 0 && /* not running the queue */
3913 (msg_action_arg < 0 || /* and */
3914 msg_action != MSG_DELIVER) && /* not delivering and */
3915 (!checking || !address_test_mode) /* not address checking */
3916 )
3917 ))
3918 {
3919 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3920 }
3921
3922 /* When we are retaining a privileged uid, we still change to the exim gid. */
3923
3924 else
3925 {
3926 int rv;
3927 rv = setgid(exim_gid);
3928 /* Impact of failure is that some stuff might end up with an incorrect group.
3929 We track this for failures from root, since any attempt to change privilege
3930 by root should succeed and failures should be examined. For non-root,
3931 there's no security risk. For me, it's { exim -bV } on a just-built binary,
3932 no need to complain then. */
3933 if (rv == -1)
3934 {
3935 if (!(unprivileged || removed_privilege))
3936 {
3937 fprintf(stderr,
3938 "exim: changing group failed: %s\n", strerror(errno));
3939 exit(EXIT_FAILURE);
3940 }
3941 else
3942 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
3943 (long int)exim_gid, strerror(errno));
3944 }
3945 }
3946
3947 /* Handle a request to scan a file for malware */
3948 if (malware_test_file)
3949 {
3950 #ifdef WITH_CONTENT_SCAN
3951 int result;
3952 set_process_info("scanning file for malware");
3953 result = malware_in_file(malware_test_file);
3954 if (result == FAIL)
3955 {
3956 printf("No malware found.\n");
3957 exit(EXIT_SUCCESS);
3958 }
3959 if (result != OK)
3960 {
3961 printf("Malware lookup returned non-okay/fail: %d\n", result);
3962 exit(EXIT_FAILURE);
3963 }
3964 if (malware_name)
3965 printf("Malware found: %s\n", malware_name);
3966 else
3967 printf("Malware scan detected malware of unknown name.\n");
3968 #else
3969 printf("Malware scanning not enabled at compile time.\n");
3970 #endif
3971 exit(EXIT_FAILURE);
3972 }
3973
3974 /* Handle a request to list the delivery queue */
3975
3976 if (list_queue)
3977 {
3978 set_process_info("listing the queue");
3979 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3980 exit(EXIT_SUCCESS);
3981 }
3982
3983 /* Handle a request to count the delivery queue */
3984
3985 if (count_queue)
3986 {
3987 set_process_info("counting the queue");
3988 queue_count();
3989 exit(EXIT_SUCCESS);
3990 }
3991
3992 /* Handle actions on specific messages, except for the force delivery and
3993 message load actions, which are done below. Some actions take a whole list of
3994 message ids, which are known to continue up to the end of the arguments. Others
3995 take a single message id and then operate on the recipients list. */
3996
3997 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3998 {
3999 int yield = EXIT_SUCCESS;
4000 set_process_info("acting on specified messages");
4001
4002 if (!one_msg_action)
4003 {
4004 for (i = msg_action_arg; i < argc; i++)
4005 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4006 yield = EXIT_FAILURE;
4007 }
4008
4009 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4010 recipients_arg)) yield = EXIT_FAILURE;
4011 exit(yield);
4012 }
4013
4014 /* All the modes below here require the remaining configuration sections
4015 to be read, except that we can skip over the ACL setting when delivering
4016 specific messages, or doing a queue run. (For various testing cases we could
4017 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
4018 for skipping. */
4019
4020 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
4021
4022 /* The configuration data will have been read into POOL_PERM because we won't
4023 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
4024 this is just a bit of pedantic tidiness. It wouldn't really matter if the
4025 configuration were read into POOL_MAIN, because we don't do any resets till
4026 later on. However, it seems right, and it does ensure that both pools get used.
4027 */
4028
4029 store_pool = POOL_MAIN;
4030
4031 /* Handle the -brt option. This is for checking out retry configurations.
4032 The next three arguments are a domain name or a complete address, and
4033 optionally two error numbers. All it does is to call the function that
4034 scans the retry configuration data. */
4035
4036 if (test_retry_arg >= 0)
4037 {
4038 retry_config *yield;
4039 int basic_errno = 0;
4040 int more_errno = 0;
4041 uschar *s1, *s2;
4042
4043 if (test_retry_arg >= argc)
4044 {
4045 printf("-brt needs a domain or address argument\n");
4046 exim_exit(EXIT_FAILURE);
4047 }
4048 s1 = argv[test_retry_arg++];
4049 s2 = NULL;
4050
4051 /* If the first argument contains no @ and no . it might be a local user
4052 or it might be a single-component name. Treat as a domain. */
4053
4054 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4055 {
4056 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4057 "being \ntreated as a one-component domain, not as a local part.\n\n",
4058 s1);
4059 }
4060
4061 /* There may be an optional second domain arg. */
4062
4063 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4064 s2 = argv[test_retry_arg++];
4065
4066 /* The final arg is an error name */
4067
4068 if (test_retry_arg < argc)
4069 {
4070 uschar *ss = argv[test_retry_arg];
4071 uschar *error =
4072 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4073 if (error != NULL)
4074 {
4075 printf("%s\n", CS error);
4076 return EXIT_FAILURE;
4077 }
4078
4079 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4080 code > 100 as an error is for matching codes to the decade. Turn them into
4081 a real error code, off the decade. */
4082
4083 if (basic_errno == ERRNO_MAIL4XX ||
4084 basic_errno == ERRNO_RCPT4XX ||
4085 basic_errno == ERRNO_DATA4XX)
4086 {
4087 int code = (more_errno >> 8) & 255;
4088 if (code == 255)
4089 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4090 else if (code > 100)
4091 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4092 }
4093 }
4094
4095 yield = retry_find_config(s1, s2, basic_errno, more_errno);
4096 if (yield == NULL) printf("No retry information found\n"); else
4097 {
4098 retry_rule *r;
4099 more_errno = yield->more_errno;
4100 printf("Retry rule: %s ", yield->pattern);
4101
4102 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4103 {
4104 printf("quota%s%s ",
4105 (more_errno > 0)? "_" : "",
4106 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4107 }
4108 else if (yield->basic_errno == ECONNREFUSED)
4109 {
4110 printf("refused%s%s ",
4111 (more_errno > 0)? "_" : "",
4112 (more_errno == 'M')? "MX" :
4113 (more_errno == 'A')? "A" : "");
4114 }
4115 else if (yield->basic_errno == ETIMEDOUT)
4116 {
4117 printf("timeout");
4118 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");