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