6b82013f879979c4529d4cd57797e3eaf417b71a
[exim.git] / src / src / exim.c
1 /* $Cambridge: exim/src/src/exim.c,v 1.71 2010/06/07 00:12:42 pdp Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2009 */
8 /* See the file NOTICE for conditions of use and distribution. */
9
10
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
13
14
15 #include "exim.h"
16
17
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 * Handler for SIGUSR1 *
143 *************************************************/
144
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
149
150 Argument: the signal number (SIGUSR1)
151 Returns: nothing
152 */
153
154 static void
155 usr1_handler(int sig)
156 {
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
159 log_close_all();
160 os_restarting_signal(SIGUSR1, usr1_handler);
161 }
162
163
164
165 /*************************************************
166 * Timeout handler *
167 *************************************************/
168
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
172 re-enables itself.
173
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
178
179 Argument: the signal value (SIGALRM)
180 Returns: nothing
181 */
182
183 void
184 sigalrm_handler(int sig)
185 {
186 sig = sig; /* Keep picky compilers happy */
187 sigalrm_seen = TRUE;
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
189 }
190
191
192
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
196
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
203
204 Argument: an itimerval structure containing the interval
205 Returns: nothing
206 */
207
208 static void
209 milliwait(struct itimerval *itval)
210 {
211 sigset_t sigmask;
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
223 }
224
225
226
227
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
231
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
234 spammers.
235
236 Argument: number of millseconds
237 Returns: nothing
238 */
239
240 void
241 millisleep(int msec)
242 {
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
248 milliwait(&itval);
249 }
250
251
252
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
256
257 /*
258 Arguments:
259 tv1 the first time
260 tv2 the second time
261
262 Returns: -1, 0, or +1
263 */
264
265 int
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
267 {
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
272 return 0;
273 }
274
275
276
277
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
281
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
291
292 Arguments:
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
298
299 Returns: nothing
300 */
301
302 void
303 exim_wait_tick(struct timeval *then_tv, int resolution)
304 {
305 struct timeval now_tv;
306 long int now_true_usec;
307
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
311
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
313 {
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
319
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
324
325 if (itval.it_value.tv_usec < 0)
326 {
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
329 }
330
331 DEBUG(D_transport|D_receive)
332 {
333 if (!running_in_test_harness)
334 {
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
339 }
340 }
341
342 milliwait(&itval);
343 }
344 }
345
346
347
348
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
352
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
355
356 Arguments: format and arguments, as for printf()
357 Returns: nothing
358 */
359
360 void
361 set_process_info(char *format, ...)
362 {
363 int len;
364 va_list ap;
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
371 va_end(ap);
372 }
373
374
375
376
377
378 /*************************************************
379 * Call fopen() with umask 777 and adjust mode *
380 *************************************************/
381
382 /* Exim runs with umask(0) so that files created with open() have the mode that
383 is specified in the open() call. However, there are some files, typically in
384 the spool directory, that are created with fopen(). They end up world-writeable
385 if no precautions are taken. Although the spool directory is not accessible to
386 the world, this is an untidiness. So this is a wrapper function for fopen()
387 that sorts out the mode of the created file.
388
389 Arguments:
390 filename the file name
391 options the fopen() options
392 mode the required mode
393
394 Returns: the fopened FILE or NULL
395 */
396
397 FILE *
398 modefopen(uschar *filename, char *options, mode_t mode)
399 {
400 mode_t saved_umask = umask(0777);
401 FILE *f = Ufopen(filename, options);
402 (void)umask(saved_umask);
403 if (f != NULL) (void)fchmod(fileno(f), mode);
404 return f;
405 }
406
407
408
409
410 /*************************************************
411 * Ensure stdin, stdout, and stderr exist *
412 *************************************************/
413
414 /* Some operating systems grumble if an exec() happens without a standard
415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
416 file will be opened and will use these fd values, and then some other bit of
417 code will assume, for example, that it can write error messages to stderr.
418 This function ensures that fds 0, 1, and 2 are open if they do not already
419 exist, by connecting them to /dev/null.
420
421 This function is also used to ensure that std{in,out,err} exist at all times,
422 so that if any library that Exim calls tries to use them, it doesn't crash.
423
424 Arguments: None
425 Returns: Nothing
426 */
427
428 void
429 exim_nullstd(void)
430 {
431 int i;
432 int devnull = -1;
433 struct stat statbuf;
434 for (i = 0; i <= 2; i++)
435 {
436 if (fstat(i, &statbuf) < 0 && errno == EBADF)
437 {
438 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
439 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
440 string_open_failed(errno, "/dev/null"));
441 if (devnull != i) (void)dup2(devnull, i);
442 }
443 }
444 if (devnull > 2) (void)close(devnull);
445 }
446
447
448
449
450 /*************************************************
451 * Close unwanted file descriptors for delivery *
452 *************************************************/
453
454 /* This function is called from a new process that has been forked to deliver
455 an incoming message, either directly, or using exec.
456
457 We want any smtp input streams to be closed in this new process. However, it
458 has been observed that using fclose() here causes trouble. When reading in -bS
459 input, duplicate copies of messages have been seen. The files will be sharing a
460 file pointer with the parent process, and it seems that fclose() (at least on
461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
462 least sometimes. Hence we go for closing the underlying file descriptors.
463
464 If TLS is active, we want to shut down the TLS library, but without molesting
465 the parent's SSL connection.
466
467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
468 stderr unless debugging) because the calling process might have set them up as
469 pipes and be waiting for them to close before it waits for the submission
470 process to terminate. If they aren't closed, they hold up the calling process
471 until the initial delivery process finishes, which is not what we want.
472
473 Exception: We do want it for synchronous delivery!
474
475 And notwithstanding all the above, if D_resolver is set, implying resolver
476 debugging, leave stdout open, because that's where the resolver writes its
477 debugging output.
478
479 When we close stderr (which implies we've also closed stdout), we also get rid
480 of any controlling terminal.
481
482 Arguments: None
483 Returns: Nothing
484 */
485
486 static void
487 close_unwanted(void)
488 {
489 if (smtp_input)
490 {
491 #ifdef SUPPORT_TLS
492 tls_close(FALSE); /* Shut down the TLS library */
493 #endif
494 (void)close(fileno(smtp_in));
495 (void)close(fileno(smtp_out));
496 smtp_in = NULL;
497 }
498 else
499 {
500 (void)close(0); /* stdin */
501 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
502 if (debug_selector == 0) /* stderr */
503 {
504 if (!synchronous_delivery)
505 {
506 (void)close(2);
507 log_stderr = NULL;
508 }
509 (void)setsid();
510 }
511 }
512 }
513
514
515
516
517 /*************************************************
518 * Set uid and gid *
519 *************************************************/
520
521 /* This function sets a new uid and gid permanently, optionally calling
522 initgroups() to set auxiliary groups. There are some special cases when running
523 Exim in unprivileged modes. In these situations the effective uid will not be
524 root; if we already have the right effective uid/gid, and don't need to
525 initialize any groups, leave things as they are.
526
527 Arguments:
528 uid the uid
529 gid the gid
530 igflag TRUE if initgroups() wanted
531 msg text to use in debugging output and failure log
532
533 Returns: nothing; bombs out on failure
534 */
535
536 void
537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
538 {
539 uid_t euid = geteuid();
540 gid_t egid = getegid();
541
542 if (euid == root_uid || euid != uid || egid != gid || igflag)
543 {
544 /* At least one OS returns +1 for initgroups failure, so just check for
545 non-zero. */
546
547 if (igflag)
548 {
549 struct passwd *pw = getpwuid(uid);
550 if (pw != NULL)
551 {
552 if (initgroups(pw->pw_name, gid) != 0)
553 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
554 (long int)uid, strerror(errno));
555 }
556 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
557 "no passwd entry for uid=%ld", (long int)uid);
558 }
559
560 if (setgid(gid) < 0 || setuid(uid) < 0)
561 {
562 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
563 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
564 }
565 }
566
567 /* Debugging output included uid/gid and all groups */
568
569 DEBUG(D_uid)
570 {
571 int group_count;
572 gid_t group_list[NGROUPS_MAX];
573 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
574 (long int)geteuid(), (long int)getegid(), (long int)getpid());
575 group_count = getgroups(NGROUPS_MAX, group_list);
576 debug_printf(" auxiliary group list:");
577 if (group_count > 0)
578 {
579 int i;
580 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
581 }
582 else debug_printf(" <none>");
583 debug_printf("\n");
584 }
585 }
586
587
588
589
590 /*************************************************
591 * Exit point *
592 *************************************************/
593
594 /* Exim exits via this function so that it always clears up any open
595 databases.
596
597 Arguments:
598 rc return code
599
600 Returns: does not return
601 */
602
603 void
604 exim_exit(int rc)
605 {
606 search_tidyup();
607 DEBUG(D_any)
608 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
609 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
610 exit(rc);
611 }
612
613
614
615
616 /*************************************************
617 * Extract port from host address *
618 *************************************************/
619
620 /* Called to extract the port from the values given to -oMa and -oMi.
621 It also checks the syntax of the address, and terminates it before the
622 port data when a port is extracted.
623
624 Argument:
625 address the address, with possible port on the end
626
627 Returns: the port, or zero if there isn't one
628 bombs out on a syntax error
629 */
630
631 static int
632 check_port(uschar *address)
633 {
634 int port = host_address_extract_port(address);
635 if (string_is_ip_address(address, NULL) == 0)
636 {
637 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
638 exit(EXIT_FAILURE);
639 }
640 return port;
641 }
642
643
644
645 /*************************************************
646 * Test/verify an address *
647 *************************************************/
648
649 /* This function is called by the -bv and -bt code. It extracts a working
650 address from a full RFC 822 address. This isn't really necessary per se, but it
651 has the effect of collapsing source routes.
652
653 Arguments:
654 s the address string
655 flags flag bits for verify_address()
656 exit_value to be set for failures
657
658 Returns: nothing
659 */
660
661 static void
662 test_address(uschar *s, int flags, int *exit_value)
663 {
664 int start, end, domain;
665 uschar *parse_error = NULL;
666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
667 FALSE);
668 if (address == NULL)
669 {
670 fprintf(stdout, "syntax error: %s\n", parse_error);
671 *exit_value = 2;
672 }
673 else
674 {
675 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
676 -1, -1, NULL, NULL, NULL);
677 if (rc == FAIL) *exit_value = 2;
678 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
679 }
680 }
681
682
683
684 /*************************************************
685 * Show supported features *
686 *************************************************/
687
688 /* This function is called for -bV/--version and for -d to output the optional
689 features of the current Exim binary.
690
691 Arguments: a FILE for printing
692 Returns: nothing
693 */
694
695 static void
696 show_whats_supported(FILE *f)
697 {
698 #ifdef DB_VERSION_STRING
699 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
700 #elif defined(BTREEVERSION) && defined(HASHVERSION)
701 #ifdef USE_DB
702 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
703 #else
704 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
705 #endif
706 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
707 fprintf(f, "Probably ndbm\n");
708 #elif defined(USE_TDB)
709 fprintf(f, "Using tdb\n");
710 #else
711 #ifdef USE_GDBM
712 fprintf(f, "Probably GDBM (native mode)\n");
713 #else
714 fprintf(f, "Probably GDBM (compatibility mode)\n");
715 #endif
716 #endif
717
718 fprintf(f, "Support for:");
719 #ifdef SUPPORT_CRYPTEQ
720 fprintf(f, " crypteq");
721 #endif
722 #if HAVE_ICONV
723 fprintf(f, " iconv()");
724 #endif
725 #if HAVE_IPV6
726 fprintf(f, " IPv6");
727 #endif
728 #ifdef HAVE_SETCLASSRESOURCES
729 fprintf(f, " use_setclassresources");
730 #endif
731 #ifdef SUPPORT_PAM
732 fprintf(f, " PAM");
733 #endif
734 #ifdef EXIM_PERL
735 fprintf(f, " Perl");
736 #endif
737 #ifdef EXPAND_DLFUNC
738 fprintf(f, " Expand_dlfunc");
739 #endif
740 #ifdef USE_TCP_WRAPPERS
741 fprintf(f, " TCPwrappers");
742 #endif
743 #ifdef SUPPORT_TLS
744 #ifdef USE_GNUTLS
745 fprintf(f, " GnuTLS");
746 #else
747 fprintf(f, " OpenSSL");
748 #endif
749 #endif
750 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
751 fprintf(f, " translate_ip_address");
752 #endif
753 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
754 fprintf(f, " move_frozen_messages");
755 #endif
756 #ifdef WITH_CONTENT_SCAN
757 fprintf(f, " Content_Scanning");
758 #endif
759 #ifndef DISABLE_DKIM
760 fprintf(f, " DKIM");
761 #endif
762 #ifdef WITH_OLD_DEMIME
763 fprintf(f, " Old_Demime");
764 #endif
765 #ifdef EXPERIMENTAL_SPF
766 fprintf(f, " Experimental_SPF");
767 #endif
768 #ifdef EXPERIMENTAL_SRS
769 fprintf(f, " Experimental_SRS");
770 #endif
771 #ifdef EXPERIMENTAL_BRIGHTMAIL
772 fprintf(f, " Experimental_Brightmail");
773 #endif
774 #ifdef EXPERIMENTAL_DCC
775 fprintf(f, " Experimental_DCC");
776 #endif
777 fprintf(f, "\n");
778
779 fprintf(f, "Lookups:");
780 #ifdef LOOKUP_LSEARCH
781 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
782 #endif
783 #ifdef LOOKUP_CDB
784 fprintf(f, " cdb");
785 #endif
786 #ifdef LOOKUP_DBM
787 fprintf(f, " dbm dbmnz");
788 #endif
789 #ifdef LOOKUP_DNSDB
790 fprintf(f, " dnsdb");
791 #endif
792 #ifdef LOOKUP_DSEARCH
793 fprintf(f, " dsearch");
794 #endif
795 #ifdef LOOKUP_IBASE
796 fprintf(f, " ibase");
797 #endif
798 #ifdef LOOKUP_LDAP
799 fprintf(f, " ldap ldapdn ldapm");
800 #endif
801 #ifdef LOOKUP_MYSQL
802 fprintf(f, " mysql");
803 #endif
804 #ifdef LOOKUP_NIS
805 fprintf(f, " nis nis0");
806 #endif
807 #ifdef LOOKUP_NISPLUS
808 fprintf(f, " nisplus");
809 #endif
810 #ifdef LOOKUP_ORACLE
811 fprintf(f, " oracle");
812 #endif
813 #ifdef LOOKUP_PASSWD
814 fprintf(f, " passwd");
815 #endif
816 #ifdef LOOKUP_PGSQL
817 fprintf(f, " pgsql");
818 #endif
819 #ifdef LOOKUP_SQLITE
820 fprintf(f, " sqlite");
821 #endif
822 #ifdef LOOKUP_TESTDB
823 fprintf(f, " testdb");
824 #endif
825 #ifdef LOOKUP_WHOSON
826 fprintf(f, " whoson");
827 #endif
828 fprintf(f, "\n");
829
830 fprintf(f, "Authenticators:");
831 #ifdef AUTH_CRAM_MD5
832 fprintf(f, " cram_md5");
833 #endif
834 #ifdef AUTH_CYRUS_SASL
835 fprintf(f, " cyrus_sasl");
836 #endif
837 #ifdef AUTH_DOVECOT
838 fprintf(f, " dovecot");
839 #endif
840 #ifdef AUTH_PLAINTEXT
841 fprintf(f, " plaintext");
842 #endif
843 #ifdef AUTH_SPA
844 fprintf(f, " spa");
845 #endif
846 fprintf(f, "\n");
847
848 fprintf(f, "Routers:");
849 #ifdef ROUTER_ACCEPT
850 fprintf(f, " accept");
851 #endif
852 #ifdef ROUTER_DNSLOOKUP
853 fprintf(f, " dnslookup");
854 #endif
855 #ifdef ROUTER_IPLITERAL
856 fprintf(f, " ipliteral");
857 #endif
858 #ifdef ROUTER_IPLOOKUP
859 fprintf(f, " iplookup");
860 #endif
861 #ifdef ROUTER_MANUALROUTE
862 fprintf(f, " manualroute");
863 #endif
864 #ifdef ROUTER_QUERYPROGRAM
865 fprintf(f, " queryprogram");
866 #endif
867 #ifdef ROUTER_REDIRECT
868 fprintf(f, " redirect");
869 #endif
870 fprintf(f, "\n");
871
872 fprintf(f, "Transports:");
873 #ifdef TRANSPORT_APPENDFILE
874 fprintf(f, " appendfile");
875 #ifdef SUPPORT_MAILDIR
876 fprintf(f, "/maildir");
877 #endif
878 #ifdef SUPPORT_MAILSTORE
879 fprintf(f, "/mailstore");
880 #endif
881 #ifdef SUPPORT_MBX
882 fprintf(f, "/mbx");
883 #endif
884 #endif
885 #ifdef TRANSPORT_AUTOREPLY
886 fprintf(f, " autoreply");
887 #endif
888 #ifdef TRANSPORT_LMTP
889 fprintf(f, " lmtp");
890 #endif
891 #ifdef TRANSPORT_PIPE
892 fprintf(f, " pipe");
893 #endif
894 #ifdef TRANSPORT_SMTP
895 fprintf(f, " smtp");
896 #endif
897 fprintf(f, "\n");
898
899 if (fixed_never_users[0] > 0)
900 {
901 int i;
902 fprintf(f, "Fixed never_users: ");
903 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
904 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
905 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
906 }
907
908 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
909
910 /* This runtime check is to help diagnose library linkage mismatches which
911 result in segfaults and the like; as such, it's left until the end,
912 just in case. There will still be a "Configuration file is" line still to
913 come. */
914 #ifdef SUPPORT_TLS
915 tls_version_report(f);
916 #endif
917 }
918
919
920
921
922 /*************************************************
923 * Quote a local part *
924 *************************************************/
925
926 /* This function is used when a sender address or a From: or Sender: header
927 line is being created from the caller's login, or from an authenticated_id. It
928 applies appropriate quoting rules for a local part.
929
930 Argument: the local part
931 Returns: the local part, quoted if necessary
932 */
933
934 uschar *
935 local_part_quote(uschar *lpart)
936 {
937 BOOL needs_quote = FALSE;
938 int size, ptr;
939 uschar *yield;
940 uschar *t;
941
942 for (t = lpart; !needs_quote && *t != 0; t++)
943 {
944 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
945 (*t != '.' || t == lpart || t[1] == 0);
946 }
947
948 if (!needs_quote) return lpart;
949
950 size = ptr = 0;
951 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
952
953 for (;;)
954 {
955 uschar *nq = US Ustrpbrk(lpart, "\\\"");
956 if (nq == NULL)
957 {
958 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
959 break;
960 }
961 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
962 yield = string_cat(yield, &size, &ptr, US"\\", 1);
963 yield = string_cat(yield, &size, &ptr, nq, 1);
964 lpart = nq + 1;
965 }
966
967 yield = string_cat(yield, &size, &ptr, US"\"", 1);
968 yield[ptr] = 0;
969 return yield;
970 }
971
972
973
974 #ifdef USE_READLINE
975 /*************************************************
976 * Load readline() functions *
977 *************************************************/
978
979 /* This function is called from testing executions that read data from stdin,
980 but only when running as the calling user. Currently, only -be does this. The
981 function loads the readline() function library and passes back the functions.
982 On some systems, it needs the curses library, so load that too, but try without
983 it if loading fails. All this functionality has to be requested at build time.
984
985 Arguments:
986 fn_readline_ptr pointer to where to put the readline pointer
987 fn_addhist_ptr pointer to where to put the addhistory function
988
989 Returns: the dlopen handle or NULL on failure
990 */
991
992 static void *
993 set_readline(char * (**fn_readline_ptr)(char *),
994 char * (**fn_addhist_ptr)(char *))
995 {
996 void *dlhandle;
997 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
998
999 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1000 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1001
1002 if (dlhandle != NULL)
1003 {
1004 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1005 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1006 }
1007 else
1008 {
1009 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1010 }
1011
1012 return dlhandle;
1013 }
1014 #endif
1015
1016
1017
1018 /*************************************************
1019 * Get a line from stdin for testing things *
1020 *************************************************/
1021
1022 /* This function is called when running tests that can take a number of lines
1023 of input (for example, -be and -bt). It handles continuations and trailing
1024 spaces. And prompting and a blank line output on eof. If readline() is in use,
1025 the arguments are non-NULL and provide the relevant functions.
1026
1027 Arguments:
1028 fn_readline readline function or NULL
1029 fn_addhist addhist function or NULL
1030
1031 Returns: pointer to dynamic memory, or NULL at end of file
1032 */
1033
1034 static uschar *
1035 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1036 {
1037 int i;
1038 int size = 0;
1039 int ptr = 0;
1040 uschar *yield = NULL;
1041
1042 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1043
1044 for (i = 0;; i++)
1045 {
1046 uschar buffer[1024];
1047 uschar *p, *ss;
1048
1049 #ifdef USE_READLINE
1050 char *readline_line = NULL;
1051 if (fn_readline != NULL)
1052 {
1053 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1054 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1055 p = US readline_line;
1056 }
1057 else
1058 #endif
1059
1060 /* readline() not in use */
1061
1062 {
1063 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1064 p = buffer;
1065 }
1066
1067 /* Handle the line */
1068
1069 ss = p + (int)Ustrlen(p);
1070 while (ss > p && isspace(ss[-1])) ss--;
1071
1072 if (i > 0)
1073 {
1074 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1075 }
1076
1077 yield = string_cat(yield, &size, &ptr, p, ss - p);
1078
1079 #ifdef USE_READLINE
1080 if (fn_readline != NULL) free(readline_line);
1081 #endif
1082
1083 if (ss == p || yield[ptr-1] != '\\')
1084 {
1085 yield[ptr] = 0;
1086 break;
1087 }
1088 yield[--ptr] = 0;
1089 }
1090
1091 if (yield == NULL) printf("\n");
1092 return yield;
1093 }
1094
1095
1096
1097 /*************************************************
1098 * Output usage information for the program *
1099 *************************************************/
1100
1101 /* This function is called when there are no recipients
1102 or a specific --help argument was added.
1103
1104 Arguments:
1105 progname information on what name we were called by
1106
1107 Returns: DOES NOT RETURN
1108 */
1109
1110 static void
1111 exim_usage(uschar *progname)
1112 {
1113
1114 /* Handle specific program invocation varients */
1115 if (Ustrcmp(progname, US"-mailq") == 0)
1116 {
1117 fprintf(stderr,
1118 "mailq - list the contents of the mail queue\n\n"
1119 "For a list of options, see the Exim documentation.\n");
1120 exit(EXIT_FAILURE);
1121 }
1122
1123 /* Generic usage - we output this whatever happens */
1124 fprintf(stderr,
1125 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1126 "not directly from a shell command line. Options and/or arguments control\n"
1127 "what it does when called. For a list of options, see the Exim documentation.\n");
1128
1129 exit(EXIT_FAILURE);
1130 }
1131
1132
1133
1134 /*************************************************
1135 * Entry point and high-level code *
1136 *************************************************/
1137
1138 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1139 the appropriate action. All the necessary functions are present in the one
1140 binary. I originally thought one should split it up, but it turns out that so
1141 much of the apparatus is needed in each chunk that one might as well just have
1142 it all available all the time, which then makes the coding easier as well.
1143
1144 Arguments:
1145 argc count of entries in argv
1146 argv argument strings, with argv[0] being the program name
1147
1148 Returns: EXIT_SUCCESS if terminated successfully
1149 EXIT_FAILURE otherwise, except when a message has been sent
1150 to the sender, and -oee was given
1151 */
1152
1153 int
1154 main(int argc, char **cargv)
1155 {
1156 uschar **argv = USS cargv;
1157 int arg_receive_timeout = -1;
1158 int arg_smtp_receive_timeout = -1;
1159 int arg_error_handling = error_handling;
1160 int filter_sfd = -1;
1161 int filter_ufd = -1;
1162 int group_count;
1163 int i;
1164 int list_queue_option = 0;
1165 int msg_action = 0;
1166 int msg_action_arg = -1;
1167 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1168 int queue_only_reason = 0;
1169 #ifdef EXIM_PERL
1170 int perl_start_option = 0;
1171 #endif
1172 int recipients_arg = argc;
1173 int sender_address_domain = 0;
1174 int test_retry_arg = -1;
1175 int test_rewrite_arg = -1;
1176 BOOL arg_queue_only = FALSE;
1177 BOOL bi_option = FALSE;
1178 BOOL checking = FALSE;
1179 BOOL count_queue = FALSE;
1180 BOOL expansion_test = FALSE;
1181 BOOL extract_recipients = FALSE;
1182 BOOL forced_delivery = FALSE;
1183 BOOL f_end_dot = FALSE;
1184 BOOL deliver_give_up = FALSE;
1185 BOOL list_queue = FALSE;
1186 BOOL list_options = FALSE;
1187 BOOL local_queue_only;
1188 BOOL more = TRUE;
1189 BOOL one_msg_action = FALSE;
1190 BOOL queue_only_set = FALSE;
1191 BOOL receiving_message = TRUE;
1192 BOOL sender_ident_set = FALSE;
1193 BOOL session_local_queue_only;
1194 BOOL unprivileged;
1195 BOOL removed_privilege = FALSE;
1196 BOOL usage_wanted = FALSE;
1197 BOOL verify_address_mode = FALSE;
1198 BOOL verify_as_sender = FALSE;
1199 BOOL version_printed = FALSE;
1200 uschar *alias_arg = NULL;
1201 uschar *called_as = US"";
1202 uschar *start_queue_run_id = NULL;
1203 uschar *stop_queue_run_id = NULL;
1204 uschar *expansion_test_message = NULL;
1205 uschar *ftest_domain = NULL;
1206 uschar *ftest_localpart = NULL;
1207 uschar *ftest_prefix = NULL;
1208 uschar *ftest_suffix = NULL;
1209 uschar *malware_test_file = NULL;
1210 uschar *real_sender_address;
1211 uschar *originator_home = US"/";
1212 void *reset_point;
1213
1214 struct passwd *pw;
1215 struct stat statbuf;
1216 pid_t passed_qr_pid = (pid_t)0;
1217 int passed_qr_pipe = -1;
1218 gid_t group_list[NGROUPS_MAX];
1219
1220 /* Possible options for -R and -S */
1221
1222 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1223
1224 /* Need to define this in case we need to change the environment in order
1225 to get rid of a bogus time zone. We have to make it char rather than uschar
1226 because some OS define it in /usr/include/unistd.h. */
1227
1228 extern char **environ;
1229
1230 /* If the Exim user and/or group and/or the configuration file owner/group were
1231 defined by ref:name at build time, we must now find the actual uid/gid values.
1232 This is a feature to make the lives of binary distributors easier. */
1233
1234 #ifdef EXIM_USERNAME
1235 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1236 {
1237 if (exim_uid == 0)
1238 {
1239 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1240 EXIM_USERNAME);
1241 exit(EXIT_FAILURE);
1242 }
1243 exim_gid = pw->pw_gid;
1244 }
1245 else
1246 {
1247 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1248 EXIM_USERNAME);
1249 exit(EXIT_FAILURE);
1250 }
1251 #endif
1252
1253 #ifdef EXIM_GROUPNAME
1254 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1255 {
1256 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1257 EXIM_GROUPNAME);
1258 exit(EXIT_FAILURE);
1259 }
1260 #endif
1261
1262 #ifdef CONFIGURE_OWNERNAME
1263 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1264 {
1265 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1266 CONFIGURE_OWNERNAME);
1267 exit(EXIT_FAILURE);
1268 }
1269 #endif
1270
1271 #ifdef CONFIGURE_GROUPNAME
1272 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1273 {
1274 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1275 CONFIGURE_GROUPNAME);
1276 exit(EXIT_FAILURE);
1277 }
1278 #endif
1279
1280 /* In the Cygwin environment, some initialization needs doing. It is fudged
1281 in by means of this macro. */
1282
1283 #ifdef OS_INIT
1284 OS_INIT
1285 #endif
1286
1287 /* Check a field which is patched when we are running Exim within its
1288 testing harness; do a fast initial check, and then the whole thing. */
1289
1290 running_in_test_harness =
1291 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1292
1293 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1294 at the start of a program; however, it seems that some environments do not
1295 follow this. A "strange" locale can affect the formatting of timestamps, so we
1296 make quite sure. */
1297
1298 setlocale(LC_ALL, "C");
1299
1300 /* Set up the default handler for timing using alarm(). */
1301
1302 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1303
1304 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1305 because store_malloc writes a log entry on failure. */
1306
1307 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1308 if (log_buffer == NULL)
1309 {
1310 fprintf(stderr, "exim: failed to get store for log buffer\n");
1311 exit(EXIT_FAILURE);
1312 }
1313
1314 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1315 NULL when the daemon is run and the file is closed. We have to use this
1316 indirection, because some systems don't allow writing to the variable "stderr".
1317 */
1318
1319 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1320
1321 /* Arrange for the PCRE regex library to use our store functions. Note that
1322 the normal calls are actually macros that add additional arguments for
1323 debugging purposes so we have to assign specially constructed functions here.
1324 The default is to use store in the stacking pool, but this is overridden in the
1325 regex_must_compile() function. */
1326
1327 pcre_malloc = function_store_get;
1328 pcre_free = function_dummy_free;
1329
1330 /* Ensure there is a big buffer for temporary use in several places. It is put
1331 in malloc store so that it can be freed for enlargement if necessary. */
1332
1333 big_buffer = store_malloc(big_buffer_size);
1334
1335 /* Set up the handler for the data request signal, and set the initial
1336 descriptive text. */
1337
1338 set_process_info("initializing");
1339 os_restarting_signal(SIGUSR1, usr1_handler);
1340
1341 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1342 in the daemon code. For the rest of Exim's uses, we ignore it. */
1343
1344 signal(SIGHUP, SIG_IGN);
1345
1346 /* We don't want to die on pipe errors as the code is written to handle
1347 the write error instead. */
1348
1349 signal(SIGPIPE, SIG_IGN);
1350
1351 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1352 set to SIG_IGN. This causes subprocesses that complete before the parent
1353 process waits for them not to hang around, so when Exim calls wait(), nothing
1354 is there. The wait() code has been made robust against this, but let's ensure
1355 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1356 ending status. We use sigaction rather than plain signal() on those OS where
1357 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1358 problem on AIX with this.) */
1359
1360 #ifdef SA_NOCLDWAIT
1361 {
1362 struct sigaction act;
1363 act.sa_handler = SIG_DFL;
1364 sigemptyset(&(act.sa_mask));
1365 act.sa_flags = 0;
1366 sigaction(SIGCHLD, &act, NULL);
1367 }
1368 #else
1369 signal(SIGCHLD, SIG_DFL);
1370 #endif
1371
1372 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1373 SIGHUP. */
1374
1375 sighup_argv = argv;
1376
1377 /* Set up the version number. Set up the leading 'E' for the external form of
1378 message ids, set the pointer to the internal form, and initialize it to
1379 indicate no message being processed. */
1380
1381 version_init();
1382 message_id_option[0] = '-';
1383 message_id_external = message_id_option + 1;
1384 message_id_external[0] = 'E';
1385 message_id = message_id_external + 1;
1386 message_id[0] = 0;
1387
1388 /* Set the umask to zero so that any files Exim creates using open() are
1389 created with the modes that it specifies. NOTE: Files created with fopen() have
1390 a problem, which was not recognized till rather late (February 2006). With this
1391 umask, such files will be world writeable. (They are all content scanning files
1392 in the spool directory, which isn't world-accessible, so this is not a
1393 disaster, but it's untidy.) I don't want to change this overall setting,
1394 however, because it will interact badly with the open() calls. Instead, there's
1395 now a function called modefopen() that fiddles with the umask while calling
1396 fopen(). */
1397
1398 (void)umask(0);
1399
1400 /* Precompile the regular expression for matching a message id. Keep this in
1401 step with the code that generates ids in the accept.c module. We need to do
1402 this here, because the -M options check their arguments for syntactic validity
1403 using mac_ismsgid, which uses this. */
1404
1405 regex_ismsgid =
1406 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1407
1408 /* Precompile the regular expression that is used for matching an SMTP error
1409 code, possibly extended, at the start of an error message. Note that the
1410 terminating whitespace character is included. */
1411
1412 regex_smtp_code =
1413 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1414 FALSE, TRUE);
1415
1416 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1417 this seems to be a generally accepted convention, since one finds symbolic
1418 links called "mailq" in standard OS configurations. */
1419
1420 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1421 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1422 {
1423 list_queue = TRUE;
1424 receiving_message = FALSE;
1425 called_as = US"-mailq";
1426 }
1427
1428 /* If the program is called as "rmail" treat it as equivalent to
1429 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1430 i.e. preventing a single dot on a line from terminating the message, and
1431 returning with zero return code, even in cases of error (provided an error
1432 message has been sent). */
1433
1434 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1435 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1436 {
1437 dot_ends = FALSE;
1438 called_as = US"-rmail";
1439 errors_sender_rc = EXIT_SUCCESS;
1440 }
1441
1442 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1443 this is a smail convention. */
1444
1445 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1446 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1447 {
1448 smtp_input = smtp_batched_input = TRUE;
1449 called_as = US"-rsmtp";
1450 }
1451
1452 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1453 this is a smail convention. */
1454
1455 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1456 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1457 {
1458 queue_interval = 0;
1459 receiving_message = FALSE;
1460 called_as = US"-runq";
1461 }
1462
1463 /* If the program is called as "newaliases" treat it as equivalent to
1464 "exim -bi"; this is a sendmail convention. */
1465
1466 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1467 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1468 {
1469 bi_option = TRUE;
1470 receiving_message = FALSE;
1471 called_as = US"-newaliases";
1472 }
1473
1474 /* Save the original effective uid for a couple of uses later. It should
1475 normally be root, but in some esoteric environments it may not be. */
1476
1477 original_euid = geteuid();
1478
1479 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1480 to be the same as the real ones. This makes a difference only if Exim is setuid
1481 (or setgid) to something other than root, which could be the case in some
1482 special configurations. */
1483
1484 real_uid = getuid();
1485 real_gid = getgid();
1486
1487 if (real_uid == root_uid)
1488 {
1489 setgid(real_gid);
1490 setuid(real_uid);
1491 }
1492
1493 /* If neither the original real uid nor the original euid was root, Exim is
1494 running in an unprivileged state. */
1495
1496 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1497
1498 /* Scan the program's arguments. Some can be dealt with right away; others are
1499 simply recorded for checking and handling afterwards. Do a high-level switch
1500 on the second character (the one after '-'), to save some effort. */
1501
1502 for (i = 1; i < argc; i++)
1503 {
1504 BOOL badarg = FALSE;
1505 uschar *arg = argv[i];
1506 uschar *argrest;
1507 int switchchar;
1508
1509 /* An argument not starting with '-' is the start of a recipients list;
1510 break out of the options-scanning loop. */
1511
1512 if (arg[0] != '-')
1513 {
1514 recipients_arg = i;
1515 break;
1516 }
1517
1518 /* An option consistion of -- terminates the options */
1519
1520 if (Ustrcmp(arg, "--") == 0)
1521 {
1522 recipients_arg = i + 1;
1523 break;
1524 }
1525
1526 /* Handle flagged options */
1527
1528 switchchar = arg[1];
1529 argrest = arg+2;
1530
1531 /* Make all -ex options synonymous with -oex arguments, since that
1532 is assumed by various callers. Also make -qR options synonymous with -R
1533 options, as that seems to be required as well. Allow for -qqR too, and
1534 the same for -S options. */
1535
1536 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1537 Ustrncmp(arg+1, "qR", 2) == 0 ||
1538 Ustrncmp(arg+1, "qS", 2) == 0)
1539 {
1540 switchchar = arg[2];
1541 argrest++;
1542 }
1543 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1544 {
1545 switchchar = arg[3];
1546 argrest += 2;
1547 queue_2stage = TRUE;
1548 }
1549
1550 /* Make -r synonymous with -f, since it is a documented alias */
1551
1552 else if (arg[1] == 'r') switchchar = 'f';
1553
1554 /* Make -ov synonymous with -v */
1555
1556 else if (Ustrcmp(arg, "-ov") == 0)
1557 {
1558 switchchar = 'v';
1559 argrest++;
1560 }
1561
1562 /* deal with --option_aliases */
1563 else if (switchchar == '-')
1564 {
1565 if (Ustrcmp(argrest, "help") == 0)
1566 {
1567 usage_wanted = TRUE;
1568 break;
1569 }
1570 else if (Ustrcmp(argrest, "version") == 0)
1571 {
1572 switchchar = 'b';
1573 argrest = US"V";
1574 }
1575 }
1576
1577 /* High-level switch on active initial letter */
1578
1579 switch(switchchar)
1580 {
1581 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1582 so has no need of it. */
1583
1584 case 'B':
1585 if (*argrest == 0) i++; /* Skip over the type */
1586 break;
1587
1588
1589 case 'b':
1590 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1591
1592 /* -bd: Run in daemon mode, awaiting SMTP connections.
1593 -bdf: Ditto, but in the foreground.
1594 */
1595
1596 if (*argrest == 'd')
1597 {
1598 daemon_listen = TRUE;
1599 if (*(++argrest) == 'f') background_daemon = FALSE;
1600 else if (*argrest != 0) { badarg = TRUE; break; }
1601 }
1602
1603 /* -be: Run in expansion test mode
1604 -bem: Ditto, but read a message from a file first
1605 */
1606
1607 else if (*argrest == 'e')
1608 {
1609 expansion_test = checking = TRUE;
1610 if (argrest[1] == 'm')
1611 {
1612 if (++i >= argc) { badarg = TRUE; break; }
1613 expansion_test_message = argv[i];
1614 argrest++;
1615 }
1616 if (argrest[1] != 0) { badarg = TRUE; break; }
1617 }
1618
1619 /* -bF: Run system filter test */
1620
1621 else if (*argrest == 'F')
1622 {
1623 filter_test |= FTEST_SYSTEM;
1624 if (*(++argrest) != 0) { badarg = TRUE; break; }
1625 if (++i < argc) filter_test_sfile = argv[i]; else
1626 {
1627 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1628 exit(EXIT_FAILURE);
1629 }
1630 }
1631
1632 /* -bf: Run user filter test
1633 -bfd: Set domain for filter testing
1634 -bfl: Set local part for filter testing
1635 -bfp: Set prefix for filter testing
1636 -bfs: Set suffix for filter testing
1637 */
1638
1639 else if (*argrest == 'f')
1640 {
1641 if (*(++argrest) == 0)
1642 {
1643 filter_test |= FTEST_USER;
1644 if (++i < argc) filter_test_ufile = argv[i]; else
1645 {
1646 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1647 exit(EXIT_FAILURE);
1648 }
1649 }
1650 else
1651 {
1652 if (++i >= argc)
1653 {
1654 fprintf(stderr, "exim: string expected after %s\n", arg);
1655 exit(EXIT_FAILURE);
1656 }
1657 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1658 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1659 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1660 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1661 else { badarg = TRUE; break; }
1662 }
1663 }
1664
1665 /* -bh: Host checking - an IP address must follow. */
1666
1667 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1668 {
1669 if (++i >= argc) { badarg = TRUE; break; }
1670 sender_host_address = argv[i];
1671 host_checking = checking = log_testing_mode = TRUE;
1672 host_checking_callout = argrest[1] == 'c';
1673 }
1674
1675 /* -bi: This option is used by sendmail to initialize *the* alias file,
1676 though it has the -oA option to specify a different file. Exim has no
1677 concept of *the* alias file, but since Sun's YP make script calls
1678 sendmail this way, some support must be provided. */
1679
1680 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1681
1682 /* -bm: Accept and deliver message - the default option. Reinstate
1683 receiving_message, which got turned off for all -b options. */
1684
1685 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1686
1687 /* -bmalware: test the filename given for malware */
1688
1689 else if (Ustrcmp(argrest, "malware") == 0)
1690 {
1691 if (++i >= argc) { badarg = TRUE; break; }
1692 malware_test_file = argv[i];
1693 }
1694
1695 /* -bnq: For locally originating messages, do not qualify unqualified
1696 addresses. In the envelope, this causes errors; in header lines they
1697 just get left. */
1698
1699 else if (Ustrcmp(argrest, "nq") == 0)
1700 {
1701 allow_unqualified_sender = FALSE;
1702 allow_unqualified_recipient = FALSE;
1703 }
1704
1705 /* -bpxx: List the contents of the mail queue, in various forms. If
1706 the option is -bpc, just a queue count is needed. Otherwise, if the
1707 first letter after p is r, then order is random. */
1708
1709 else if (*argrest == 'p')
1710 {
1711 if (*(++argrest) == 'c')
1712 {
1713 count_queue = TRUE;
1714 if (*(++argrest) != 0) badarg = TRUE;
1715 break;
1716 }
1717
1718 if (*argrest == 'r')
1719 {
1720 list_queue_option = 8;
1721 argrest++;
1722 }
1723 else list_queue_option = 0;
1724
1725 list_queue = TRUE;
1726
1727 /* -bp: List the contents of the mail queue, top-level only */
1728
1729 if (*argrest == 0) {}
1730
1731 /* -bpu: List the contents of the mail queue, top-level undelivered */
1732
1733 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1734
1735 /* -bpa: List the contents of the mail queue, including all delivered */
1736
1737 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1738
1739 /* Unknown after -bp[r] */
1740
1741 else
1742 {
1743 badarg = TRUE;
1744 break;
1745 }
1746 }
1747
1748
1749 /* -bP: List the configuration variables given as the address list.
1750 Force -v, so configuration errors get displayed. */
1751
1752 else if (Ustrcmp(argrest, "P") == 0)
1753 {
1754 list_options = TRUE;
1755 debug_selector |= D_v;
1756 debug_file = stderr;
1757 }
1758
1759 /* -brt: Test retry configuration lookup */
1760
1761 else if (Ustrcmp(argrest, "rt") == 0)
1762 {
1763 test_retry_arg = i + 1;
1764 goto END_ARG;
1765 }
1766
1767 /* -brw: Test rewrite configuration */
1768
1769 else if (Ustrcmp(argrest, "rw") == 0)
1770 {
1771 test_rewrite_arg = i + 1;
1772 goto END_ARG;
1773 }
1774
1775 /* -bS: Read SMTP commands on standard input, but produce no replies -
1776 all errors are reported by sending messages. */
1777
1778 else if (Ustrcmp(argrest, "S") == 0)
1779 smtp_input = smtp_batched_input = receiving_message = TRUE;
1780
1781 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1782 on standard output. */
1783
1784 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1785
1786 /* -bt: address testing mode */
1787
1788 else if (Ustrcmp(argrest, "t") == 0)
1789 address_test_mode = checking = log_testing_mode = TRUE;
1790
1791 /* -bv: verify addresses */
1792
1793 else if (Ustrcmp(argrest, "v") == 0)
1794 verify_address_mode = checking = log_testing_mode = TRUE;
1795
1796 /* -bvs: verify sender addresses */
1797
1798 else if (Ustrcmp(argrest, "vs") == 0)
1799 {
1800 verify_address_mode = checking = log_testing_mode = TRUE;
1801 verify_as_sender = TRUE;
1802 }
1803
1804 /* -bV: Print version string and support details */
1805
1806 else if (Ustrcmp(argrest, "V") == 0)
1807 {
1808 printf("Exim version %s #%s built %s\n", version_string,
1809 version_cnumber, version_date);
1810 printf("%s\n", CS version_copyright);
1811 version_printed = TRUE;
1812 show_whats_supported(stdout);
1813 }
1814
1815 else badarg = TRUE;
1816 break;
1817
1818
1819 /* -C: change configuration file list; ignore if it isn't really
1820 a change! Enforce a prefix check if required. */
1821
1822 case 'C':
1823 if (*argrest == 0)
1824 {
1825 if(++i < argc) argrest = argv[i]; else
1826 { badarg = TRUE; break; }
1827 }
1828 if (Ustrcmp(config_main_filelist, argrest) != 0)
1829 {
1830 #ifdef ALT_CONFIG_PREFIX
1831 int sep = 0;
1832 int len = Ustrlen(ALT_CONFIG_PREFIX);
1833 uschar *list = argrest;
1834 uschar *filename;
1835 while((filename = string_nextinlist(&list, &sep, big_buffer,
1836 big_buffer_size)) != NULL)
1837 {
1838 if ((Ustrlen(filename) < len ||
1839 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1840 Ustrstr(filename, "/../") != NULL) &&
1841 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1842 {
1843 fprintf(stderr, "-C Permission denied\n");
1844 exit(EXIT_FAILURE);
1845 }
1846 }
1847 #endif
1848 if (real_uid != root_uid)
1849 {
1850 #ifdef TRUSTED_CONFIG_PREFIX_LIST
1851
1852 if (Ustrstr(argrest, "/../"))
1853 trusted_config = FALSE;
1854 else
1855 {
1856 FILE *trust_list = Ufopen(TRUSTED_CONFIG_PREFIX_LIST, "rb");
1857 if (trust_list)
1858 {
1859 struct stat statbuf;
1860
1861 if (fstat(fileno(trust_list), &statbuf) != 0 ||
1862 (statbuf.st_uid != root_uid /* owner not root */
1863 #ifdef CONFIGURE_OWNER
1864 && statbuf.st_uid != config_uid /* owner not the special one */
1865 #endif
1866 ) || /* or */
1867 (statbuf.st_gid != root_gid /* group not root */
1868 #ifdef CONFIGURE_GROUP
1869 && statbuf.st_gid != config_gid /* group not the special one */
1870 #endif
1871 && (statbuf.st_mode & 020) != 0 /* group writeable */
1872 ) || /* or */
1873 (statbuf.st_mode & 2) != 0) /* world writeable */
1874 {
1875 trusted_config = FALSE;
1876 fclose(trust_list);
1877 }
1878 else
1879 {
1880 /* Well, the trust list at least is up to scratch... */
1881 void *reset_point = store_get(0);
1882 uschar *trusted_prefixes[32];
1883 int nr_prefixes = 0;
1884 int i = 0;
1885
1886 while (Ufgets(big_buffer, big_buffer_size, trust_list))
1887 {
1888 uschar *start = big_buffer, *nl;
1889 while (*start && isspace(*start))
1890 start++;
1891 if (*start != '/')
1892 continue;
1893 nl = Ustrchr(start, '\n');
1894 if (nl)
1895 *nl = 0;
1896 trusted_prefixes[nr_prefixes++] = string_copy(start);
1897 if (nr_prefixes == 32)
1898 break;
1899 }
1900 fclose(trust_list);
1901
1902 if (nr_prefixes)
1903 {
1904 int sep = 0;
1905 uschar *list = argrest;
1906 uschar *filename;
1907 while (trusted_config && (filename = string_nextinlist(&list,
1908 &sep, big_buffer, big_buffer_size)) != NULL)
1909 {
1910 for (i=0; i < nr_prefixes; i++)
1911 {
1912 int len = Ustrlen(trusted_prefixes[i]);
1913 if (Ustrlen(filename) >= len &&
1914 Ustrncmp(filename, trusted_prefixes[i], len) == 0)
1915 break;
1916 }
1917 if (i == nr_prefixes)
1918 {
1919 trusted_config = FALSE;
1920 break;
1921 }
1922 }
1923 store_reset(reset_point);
1924 }
1925 else
1926 {
1927 /* No valid prefixes found in trust_list file. */
1928 trusted_config = FALSE;
1929 }
1930 }
1931 }
1932 else
1933 {
1934 /* Could not open trust_list file. */
1935 trusted_config = FALSE;
1936 }
1937 }
1938 #else
1939 /* Not root; don't trust config */
1940 trusted_config = FALSE;
1941 #endif
1942 }
1943
1944 config_main_filelist = argrest;
1945 config_changed = TRUE;
1946 }
1947 break;
1948
1949
1950 /* -D: set up a macro definition */
1951
1952 case 'D':
1953 #ifdef DISABLE_D_OPTION
1954 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1955 exit(EXIT_FAILURE);
1956 #else
1957 {
1958 int ptr = 0;
1959 macro_item *mlast = NULL;
1960 macro_item *m;
1961 uschar name[24];
1962 uschar *s = argrest;
1963
1964 while (isspace(*s)) s++;
1965
1966 if (*s < 'A' || *s > 'Z')
1967 {
1968 fprintf(stderr, "exim: macro name set by -D must start with "
1969 "an upper case letter\n");
1970 exit(EXIT_FAILURE);
1971 }
1972
1973 while (isalnum(*s) || *s == '_')
1974 {
1975 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1976 s++;
1977 }
1978 name[ptr] = 0;
1979 if (ptr == 0) { badarg = TRUE; break; }
1980 while (isspace(*s)) s++;
1981 if (*s != 0)
1982 {
1983 if (*s++ != '=') { badarg = TRUE; break; }
1984 while (isspace(*s)) s++;
1985 }
1986
1987 for (m = macros; m != NULL; m = m->next)
1988 {
1989 if (Ustrcmp(m->name, name) == 0)
1990 {
1991 fprintf(stderr, "exim: duplicated -D in command line\n");
1992 exit(EXIT_FAILURE);
1993 }
1994 mlast = m;
1995 }
1996
1997 m = store_get(sizeof(macro_item) + Ustrlen(name));
1998 m->next = NULL;
1999 m->command_line = TRUE;
2000 if (mlast == NULL) macros = m; else mlast->next = m;
2001 Ustrcpy(m->name, name);
2002 m->replacement = string_copy(s);
2003
2004 if (clmacro_count >= MAX_CLMACROS)
2005 {
2006 fprintf(stderr, "exim: too many -D options on command line\n");
2007 exit(EXIT_FAILURE);
2008 }
2009 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2010 m->replacement);
2011 }
2012 #endif
2013 break;
2014
2015 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2016 The latter is now a no-op, retained for compatibility only. If -dd is used,
2017 debugging subprocesses of the daemon is disabled. */
2018
2019 case 'd':
2020 if (Ustrcmp(argrest, "ropcr") == 0)
2021 {
2022 /* drop_cr = TRUE; */
2023 }
2024
2025 /* Use an intermediate variable so that we don't set debugging while
2026 decoding the debugging bits. */
2027
2028 else
2029 {
2030 unsigned int selector = D_default;
2031 debug_selector = 0;
2032 debug_file = NULL;
2033 if (*argrest == 'd')
2034 {
2035 debug_daemon = TRUE;
2036 argrest++;
2037 }
2038 if (*argrest != 0)
2039 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2040 debug_options_count, US"debug", 0);
2041 debug_selector = selector;
2042 }
2043 break;
2044
2045
2046 /* -E: This is a local error message. This option is not intended for
2047 external use at all, but is not restricted to trusted callers because it
2048 does no harm (just suppresses certain error messages) and if Exim is run
2049 not setuid root it won't always be trusted when it generates error
2050 messages using this option. If there is a message id following -E, point
2051 message_reference at it, for logging. */
2052
2053 case 'E':
2054 local_error_message = TRUE;
2055 if (mac_ismsgid(argrest)) message_reference = argrest;
2056 break;
2057
2058
2059 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2060 option, so it looks as if historically the -oex options are also callable
2061 without the leading -o. So we have to accept them. Before the switch,
2062 anything starting -oe has been converted to -e. Exim does not support all
2063 of the sendmail error options. */
2064
2065 case 'e':
2066 if (Ustrcmp(argrest, "e") == 0)
2067 {
2068 arg_error_handling = ERRORS_SENDER;
2069 errors_sender_rc = EXIT_SUCCESS;
2070 }
2071 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2072 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2073 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2074 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2075 else badarg = TRUE;
2076 break;
2077
2078
2079 /* -F: Set sender's full name, used instead of the gecos entry from
2080 the password file. Since users can usually alter their gecos entries,
2081 there's no security involved in using this instead. The data can follow
2082 the -F or be in the next argument. */
2083
2084 case 'F':
2085 if (*argrest == 0)
2086 {
2087 if(++i < argc) argrest = argv[i]; else
2088 { badarg = TRUE; break; }
2089 }
2090 originator_name = argrest;
2091 sender_name_forced = TRUE;
2092 break;
2093
2094
2095 /* -f: Set sender's address - this value is only actually used if Exim is
2096 run by a trusted user, or if untrusted_set_sender is set and matches the
2097 address, except that the null address can always be set by any user. The
2098 test for this happens later, when the value given here is ignored when not
2099 permitted. For an untrusted user, the actual sender is still put in Sender:
2100 if it doesn't match the From: header (unless no_local_from_check is set).
2101 The data can follow the -f or be in the next argument. The -r switch is an
2102 obsolete form of -f but since there appear to be programs out there that
2103 use anything that sendmail has ever supported, better accept it - the
2104 synonymizing is done before the switch above.
2105
2106 At this stage, we must allow domain literal addresses, because we don't
2107 know what the setting of allow_domain_literals is yet. Ditto for trailing
2108 dots and strip_trailing_dot. */
2109
2110 case 'f':
2111 {
2112 int start, end;
2113 uschar *errmess;
2114 if (*argrest == 0)
2115 {
2116 if (i+1 < argc) argrest = argv[++i]; else
2117 { badarg = TRUE; break; }
2118 }
2119 if (*argrest == 0)
2120 {
2121 sender_address = string_sprintf(""); /* Ensure writeable memory */
2122 }
2123 else
2124 {
2125 uschar *temp = argrest + Ustrlen(argrest) - 1;
2126 while (temp >= argrest && isspace(*temp)) temp--;
2127 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2128 allow_domain_literals = TRUE;
2129 strip_trailing_dot = TRUE;
2130 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2131 &sender_address_domain, TRUE);
2132 allow_domain_literals = FALSE;
2133 strip_trailing_dot = FALSE;
2134 if (sender_address == NULL)
2135 {
2136 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2137 return EXIT_FAILURE;
2138 }
2139 }
2140 sender_address_forced = TRUE;
2141 }
2142 break;
2143
2144 /* This is some Sendmail thing which can be ignored */
2145
2146 case 'G':
2147 break;
2148
2149 /* -h: Set the hop count for an incoming message. Exim does not currently
2150 support this; it always computes it by counting the Received: headers.
2151 To put it in will require a change to the spool header file format. */
2152
2153 case 'h':
2154 if (*argrest == 0)
2155 {
2156 if(++i < argc) argrest = argv[i]; else
2157 { badarg = TRUE; break; }
2158 }
2159 if (!isdigit(*argrest)) badarg = TRUE;
2160 break;
2161
2162
2163 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2164 not to be documented for sendmail but mailx (at least) uses it) */
2165
2166 case 'i':
2167 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2168 break;
2169
2170
2171 case 'M':
2172 receiving_message = FALSE;
2173
2174 /* -MC: continue delivery of another message via an existing open
2175 file descriptor. This option is used for an internal call by the
2176 smtp transport when there is a pending message waiting to go to an
2177 address to which it has got a connection. Five subsequent arguments are
2178 required: transport name, host name, IP address, sequence number, and
2179 message_id. Transports may decline to create new processes if the sequence
2180 number gets too big. The channel is stdin. This (-MC) must be the last
2181 argument. There's a subsequent check that the real-uid is privileged.
2182
2183 If we are running in the test harness. delay for a bit, to let the process
2184 that set this one up complete. This makes for repeatability of the logging,
2185 etc. output. */
2186
2187 if (Ustrcmp(argrest, "C") == 0)
2188 {
2189 union sockaddr_46 interface_sock;
2190 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2191
2192 if (argc != i + 6)
2193 {
2194 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2195 return EXIT_FAILURE;
2196 }
2197
2198 if (msg_action_arg >= 0)
2199 {
2200 fprintf(stderr, "exim: incompatible arguments\n");
2201 return EXIT_FAILURE;
2202 }
2203
2204 continue_transport = argv[++i];
2205 continue_hostname = argv[++i];
2206 continue_host_address = argv[++i];
2207 continue_sequence = Uatoi(argv[++i]);
2208 msg_action = MSG_DELIVER;
2209 msg_action_arg = ++i;
2210 forced_delivery = TRUE;
2211 queue_run_pid = passed_qr_pid;
2212 queue_run_pipe = passed_qr_pipe;
2213
2214 if (!mac_ismsgid(argv[i]))
2215 {
2216 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2217 argv[i]);
2218 return EXIT_FAILURE;
2219 }
2220
2221 /* Set up $sending_ip_address and $sending_port */
2222
2223 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2224 &size) == 0)
2225 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2226 &sending_port);
2227 else
2228 {
2229 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2230 strerror(errno));
2231 return EXIT_FAILURE;
2232 }
2233
2234 if (running_in_test_harness) millisleep(500);
2235 break;
2236 }
2237
2238 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2239 precedes -MC (see above). The flag indicates that the host to which
2240 Exim is connected has accepted an AUTH sequence. */
2241
2242 else if (Ustrcmp(argrest, "CA") == 0)
2243 {
2244 smtp_authenticated = TRUE;
2245 break;
2246 }
2247
2248 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2249 it preceded -MC (see above) */
2250
2251 else if (Ustrcmp(argrest, "CP") == 0)
2252 {
2253 smtp_use_pipelining = TRUE;
2254 break;
2255 }
2256
2257 /* -MCQ: pass on the pid of the queue-running process that started
2258 this chain of deliveries and the fd of its synchronizing pipe; this
2259 is useful only when it precedes -MC (see above) */
2260
2261 else if (Ustrcmp(argrest, "CQ") == 0)
2262 {
2263 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2264 else badarg = TRUE;
2265 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2266 else badarg = TRUE;
2267 break;
2268 }
2269
2270 /* -MCS: set the smtp_use_size flag; this is useful only when it
2271 precedes -MC (see above) */
2272
2273 else if (Ustrcmp(argrest, "CS") == 0)
2274 {
2275 smtp_use_size = TRUE;
2276 break;
2277 }
2278
2279 /* -MCT: set the tls_offered flag; this is useful only when it
2280 precedes -MC (see above). The flag indicates that the host to which
2281 Exim is connected has offered TLS support. */
2282
2283 #ifdef SUPPORT_TLS
2284 else if (Ustrcmp(argrest, "CT") == 0)
2285 {
2286 tls_offered = TRUE;
2287 break;
2288 }
2289 #endif
2290
2291 /* -M[x]: various operations on the following list of message ids:
2292 -M deliver the messages, ignoring next retry times and thawing
2293 -Mc deliver the messages, checking next retry times, no thawing
2294 -Mf freeze the messages
2295 -Mg give up on the messages
2296 -Mt thaw the messages
2297 -Mrm remove the messages
2298 In the above cases, this must be the last option. There are also the
2299 following options which are followed by a single message id, and which
2300 act on that message. Some of them use the "recipient" addresses as well.
2301 -Mar add recipient(s)
2302 -Mmad mark all recipients delivered
2303 -Mmd mark recipients(s) delivered
2304 -Mes edit sender
2305 -Mset load a message for use with -be
2306 -Mvb show body
2307 -Mvc show copy (of whole message, in RFC 2822 format)
2308 -Mvh show header
2309 -Mvl show log
2310 */
2311
2312 else if (*argrest == 0)
2313 {
2314 msg_action = MSG_DELIVER;
2315 forced_delivery = deliver_force_thaw = TRUE;
2316 }
2317 else if (Ustrcmp(argrest, "ar") == 0)
2318 {
2319 msg_action = MSG_ADD_RECIPIENT;
2320 one_msg_action = TRUE;
2321 }
2322 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2323 else if (Ustrcmp(argrest, "es") == 0)
2324 {
2325 msg_action = MSG_EDIT_SENDER;
2326 one_msg_action = TRUE;
2327 }
2328 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2329 else if (Ustrcmp(argrest, "g") == 0)
2330 {
2331 msg_action = MSG_DELIVER;
2332 deliver_give_up = TRUE;
2333 }
2334 else if (Ustrcmp(argrest, "mad") == 0)
2335 {
2336 msg_action = MSG_MARK_ALL_DELIVERED;
2337 }
2338 else if (Ustrcmp(argrest, "md") == 0)
2339 {
2340 msg_action = MSG_MARK_DELIVERED;
2341 one_msg_action = TRUE;
2342 }
2343 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2344 else if (Ustrcmp(argrest, "set") == 0)
2345 {
2346 msg_action = MSG_LOAD;
2347 one_msg_action = TRUE;
2348 }
2349 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2350 else if (Ustrcmp(argrest, "vb") == 0)
2351 {
2352 msg_action = MSG_SHOW_BODY;
2353 one_msg_action = TRUE;
2354 }
2355 else if (Ustrcmp(argrest, "vc") == 0)
2356 {
2357 msg_action = MSG_SHOW_COPY;
2358 one_msg_action = TRUE;
2359 }
2360 else if (Ustrcmp(argrest, "vh") == 0)
2361 {
2362 msg_action = MSG_SHOW_HEADER;
2363 one_msg_action = TRUE;
2364 }
2365 else if (Ustrcmp(argrest, "vl") == 0)
2366 {
2367 msg_action = MSG_SHOW_LOG;
2368 one_msg_action = TRUE;
2369 }
2370 else { badarg = TRUE; break; }
2371
2372 /* All the -Mxx options require at least one message id. */
2373
2374 msg_action_arg = i + 1;
2375 if (msg_action_arg >= argc)
2376 {
2377 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2378 return EXIT_FAILURE;
2379 }
2380
2381 /* Some require only message ids to follow */
2382
2383 if (!one_msg_action)
2384 {
2385 int j;
2386 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2387 {
2388 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2389 argv[j], arg);
2390 return EXIT_FAILURE;
2391 }
2392 goto END_ARG; /* Remaining args are ids */
2393 }
2394
2395 /* Others require only one message id, possibly followed by addresses,
2396 which will be handled as normal arguments. */
2397
2398 else
2399 {
2400 if (!mac_ismsgid(argv[msg_action_arg]))
2401 {
2402 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2403 argv[msg_action_arg], arg);
2404 return EXIT_FAILURE;
2405 }
2406 i++;
2407 }
2408 break;
2409
2410
2411 /* Some programs seem to call the -om option without the leading o;
2412 for sendmail it askes for "me too". Exim always does this. */
2413
2414 case 'm':
2415 if (*argrest != 0) badarg = TRUE;
2416 break;
2417
2418
2419 /* -N: don't do delivery - a debugging option that stops transports doing
2420 their thing. It implies debugging at the D_v level. */
2421
2422 case 'N':
2423 if (*argrest == 0)
2424 {
2425 dont_deliver = TRUE;
2426 debug_selector |= D_v;
2427 debug_file = stderr;
2428 }
2429 else badarg = TRUE;
2430 break;
2431
2432
2433 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2434 it. */
2435
2436 case 'n':
2437 break;
2438
2439 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2440 option to the specified value. This form uses long names. We need to handle
2441 -O option=value and -Ooption=value. */
2442
2443 case 'O':
2444 if (*argrest == 0)
2445 {
2446 if (++i >= argc)
2447 {
2448 fprintf(stderr, "exim: string expected after -O\n");
2449 exit(EXIT_FAILURE);
2450 }
2451 }
2452 break;
2453
2454 case 'o':
2455
2456 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2457 file" option). */
2458
2459 if (*argrest == 'A')
2460 {
2461 alias_arg = argrest + 1;
2462 if (alias_arg[0] == 0)
2463 {
2464 if (i+1 < argc) alias_arg = argv[++i]; else
2465 {
2466 fprintf(stderr, "exim: string expected after -oA\n");
2467 exit(EXIT_FAILURE);
2468 }
2469 }
2470 }
2471
2472 /* -oB: Set a connection message max value for remote deliveries */
2473
2474 else if (*argrest == 'B')
2475 {
2476 uschar *p = argrest + 1;
2477 if (p[0] == 0)
2478 {
2479 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2480 {
2481 connection_max_messages = 1;
2482 p = NULL;
2483 }
2484 }
2485
2486 if (p != NULL)
2487 {
2488 if (!isdigit(*p))
2489 {
2490 fprintf(stderr, "exim: number expected after -oB\n");
2491 exit(EXIT_FAILURE);
2492 }
2493 connection_max_messages = Uatoi(p);
2494 }
2495 }
2496
2497 /* -odb: background delivery */
2498
2499 else if (Ustrcmp(argrest, "db") == 0)
2500 {
2501 synchronous_delivery = FALSE;
2502 arg_queue_only = FALSE;
2503 queue_only_set = TRUE;
2504 }
2505
2506 /* -odf: foreground delivery (smail-compatible option); same effect as
2507 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2508 */
2509
2510 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2511 {
2512 synchronous_delivery = TRUE;
2513 arg_queue_only = FALSE;
2514 queue_only_set = TRUE;
2515 }
2516
2517 /* -odq: queue only */
2518
2519 else if (Ustrcmp(argrest, "dq") == 0)
2520 {
2521 synchronous_delivery = FALSE;
2522 arg_queue_only = TRUE;
2523 queue_only_set = TRUE;
2524 }
2525
2526 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2527 but no remote delivery */
2528
2529 else if (Ustrcmp(argrest, "dqs") == 0)
2530 {
2531 queue_smtp = TRUE;
2532 arg_queue_only = FALSE;
2533 queue_only_set = TRUE;
2534 }
2535
2536 /* -oex: Sendmail error flags. As these are also accepted without the
2537 leading -o prefix, for compatibility with vacation and other callers,
2538 they are handled with -e above. */
2539
2540 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2541 -oitrue: Another sendmail syntax for the same */
2542
2543 else if (Ustrcmp(argrest, "i") == 0 ||
2544 Ustrcmp(argrest, "itrue") == 0)
2545 dot_ends = FALSE;
2546
2547 /* -oM*: Set various characteristics for an incoming message; actually
2548 acted on for trusted callers only. */
2549
2550 else if (*argrest == 'M')
2551 {
2552 if (i+1 >= argc)
2553 {
2554 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2555 exit(EXIT_FAILURE);
2556 }
2557
2558 /* -oMa: Set sender host address */
2559
2560 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2561
2562 /* -oMaa: Set authenticator name */
2563
2564 else if (Ustrcmp(argrest, "Maa") == 0)
2565 sender_host_authenticated = argv[++i];
2566
2567 /* -oMas: setting authenticated sender */
2568
2569 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2570
2571 /* -oMai: setting authenticated id */
2572
2573 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2574
2575 /* -oMi: Set incoming interface address */
2576
2577 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2578
2579 /* -oMr: Received protocol */
2580
2581 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2582
2583 /* -oMs: Set sender host name */
2584
2585 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2586
2587 /* -oMt: Set sender ident */
2588
2589 else if (Ustrcmp(argrest, "Mt") == 0)
2590 {
2591 sender_ident_set = TRUE;
2592 sender_ident = argv[++i];
2593 }
2594
2595 /* Else a bad argument */
2596
2597 else
2598 {
2599 badarg = TRUE;
2600 break;
2601 }
2602 }
2603
2604 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2605 seem to call this as -m (undocumented), so that is also accepted (see
2606 above). */
2607
2608 else if (Ustrcmp(argrest, "m") == 0) {}
2609
2610 /* -oo: An ancient flag for old-style addresses which still seems to
2611 crop up in some calls (see in SCO). */
2612
2613 else if (Ustrcmp(argrest, "o") == 0) {}
2614
2615 /* -oP <name>: set pid file path for daemon */
2616
2617 else if (Ustrcmp(argrest, "P") == 0)
2618 override_pid_file_path = argv[++i];
2619
2620 /* -or <n>: set timeout for non-SMTP acceptance
2621 -os <n>: set timeout for SMTP acceptance */
2622
2623 else if (*argrest == 'r' || *argrest == 's')
2624 {
2625 int *tp = (*argrest == 'r')?
2626 &arg_receive_timeout : &arg_smtp_receive_timeout;
2627 if (argrest[1] == 0)
2628 {
2629 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2630 }
2631 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2632 if (*tp < 0)
2633 {
2634 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2635 exit(EXIT_FAILURE);
2636 }
2637 }
2638
2639 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2640
2641 else if (Ustrcmp(argrest, "X") == 0)
2642 override_local_interfaces = argv[++i];
2643
2644 /* Unknown -o argument */
2645
2646 else badarg = TRUE;
2647 break;
2648
2649
2650 /* -ps: force Perl startup; -pd force delayed Perl startup */
2651
2652 case 'p':
2653 #ifdef EXIM_PERL
2654 if (*argrest == 's' && argrest[1] == 0)
2655 {
2656 perl_start_option = 1;
2657 break;
2658 }
2659 if (*argrest == 'd' && argrest[1] == 0)
2660 {
2661 perl_start_option = -1;
2662 break;
2663 }
2664 #endif
2665
2666 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2667 which sets the host protocol and host name */
2668
2669 if (*argrest == 0)
2670 {
2671 if (i+1 < argc) argrest = argv[++i]; else
2672 { badarg = TRUE; break; }
2673 }
2674
2675 if (*argrest != 0)
2676 {
2677 uschar *hn = Ustrchr(argrest, ':');
2678 if (hn == NULL)
2679 {
2680 received_protocol = argrest;
2681 }
2682 else
2683 {
2684 received_protocol = string_copyn(argrest, hn - argrest);
2685 sender_host_name = hn + 1;
2686 }
2687 }
2688 break;
2689
2690
2691 case 'q':
2692 receiving_message = FALSE;
2693 if (queue_interval >= 0)
2694 {
2695 fprintf(stderr, "exim: -q specified more than once\n");
2696 exit(EXIT_FAILURE);
2697 }
2698
2699 /* -qq...: Do queue runs in a 2-stage manner */
2700
2701 if (*argrest == 'q')
2702 {
2703 queue_2stage = TRUE;
2704 argrest++;
2705 }
2706
2707 /* -qi...: Do only first (initial) deliveries */
2708
2709 if (*argrest == 'i')
2710 {
2711 queue_run_first_delivery = TRUE;
2712 argrest++;
2713 }
2714
2715 /* -qf...: Run the queue, forcing deliveries
2716 -qff..: Ditto, forcing thawing as well */
2717
2718 if (*argrest == 'f')
2719 {
2720 queue_run_force = TRUE;
2721 if (*(++argrest) == 'f')
2722 {
2723 deliver_force_thaw = TRUE;
2724 argrest++;
2725 }
2726 }
2727
2728 /* -q[f][f]l...: Run the queue only on local deliveries */
2729
2730 if (*argrest == 'l')
2731 {
2732 queue_run_local = TRUE;
2733 argrest++;
2734 }
2735
2736 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2737 optionally starting from a given message id. */
2738
2739 if (*argrest == 0 &&
2740 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2741 {
2742 queue_interval = 0;
2743 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2744 start_queue_run_id = argv[++i];
2745 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2746 stop_queue_run_id = argv[++i];
2747 }
2748
2749 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2750 optionally local only. */
2751
2752 else
2753 {
2754 if (*argrest != 0)
2755 queue_interval = readconf_readtime(argrest, 0, FALSE);
2756 else
2757 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2758 if (queue_interval <= 0)
2759 {
2760 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2761 exit(EXIT_FAILURE);
2762 }
2763 }
2764 break;
2765
2766
2767 case 'R': /* Synonymous with -qR... */
2768 receiving_message = FALSE;
2769
2770 /* -Rf: As -R (below) but force all deliveries,
2771 -Rff: Ditto, but also thaw all frozen messages,
2772 -Rr: String is regex
2773 -Rrf: Regex and force
2774 -Rrff: Regex and force and thaw
2775
2776 in all cases provided there are no further characters in this
2777 argument. */
2778
2779 if (*argrest != 0)
2780 {
2781 int i;
2782 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2783 {
2784 if (Ustrcmp(argrest, rsopts[i]) == 0)
2785 {
2786 if (i != 2) queue_run_force = TRUE;
2787 if (i >= 2) deliver_selectstring_regex = TRUE;
2788 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2789 argrest += Ustrlen(rsopts[i]);
2790 }
2791 }
2792 }
2793
2794 /* -R: Set string to match in addresses for forced queue run to
2795 pick out particular messages. */
2796
2797 if (*argrest == 0)
2798 {
2799 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2800 {
2801 fprintf(stderr, "exim: string expected after -R\n");
2802 exit(EXIT_FAILURE);
2803 }
2804 }
2805 else deliver_selectstring = argrest;
2806 break;
2807
2808
2809 /* -r: an obsolete synonym for -f (see above) */
2810
2811
2812 /* -S: Like -R but works on sender. */
2813
2814 case 'S': /* Synonymous with -qS... */
2815 receiving_message = FALSE;
2816
2817 /* -Sf: As -S (below) but force all deliveries,
2818 -Sff: Ditto, but also thaw all frozen messages,
2819 -Sr: String is regex
2820 -Srf: Regex and force
2821 -Srff: Regex and force and thaw
2822
2823 in all cases provided there are no further characters in this
2824 argument. */
2825
2826 if (*argrest != 0)
2827 {
2828 int i;
2829 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2830 {
2831 if (Ustrcmp(argrest, rsopts[i]) == 0)
2832 {
2833 if (i != 2) queue_run_force = TRUE;
2834 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2835 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2836 argrest += Ustrlen(rsopts[i]);
2837 }
2838 }
2839 }
2840
2841 /* -S: Set string to match in addresses for forced queue run to
2842 pick out particular messages. */
2843
2844 if (*argrest == 0)
2845 {
2846 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2847 {
2848 fprintf(stderr, "exim: string expected after -S\n");
2849 exit(EXIT_FAILURE);
2850 }
2851 }
2852 else deliver_selectstring_sender = argrest;
2853 break;
2854
2855 /* -Tqt is an option that is exclusively for use by the testing suite.
2856 It is not recognized in other circumstances. It allows for the setting up
2857 of explicit "queue times" so that various warning/retry things can be
2858 tested. Otherwise variability of clock ticks etc. cause problems. */
2859
2860 case 'T':
2861 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2862 fudged_queue_times = argv[++i];
2863 else badarg = TRUE;
2864 break;
2865
2866
2867 /* -t: Set flag to extract recipients from body of message. */
2868
2869 case 't':
2870 if (*argrest == 0) extract_recipients = TRUE;
2871
2872 /* -ti: Set flag to extract recipients from body of message, and also
2873 specify that dot does not end the message. */
2874
2875 else if (Ustrcmp(argrest, "i") == 0)
2876 {
2877 extract_recipients = TRUE;
2878 dot_ends = FALSE;
2879 }
2880
2881 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2882
2883 #ifdef SUPPORT_TLS
2884 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2885 #endif
2886
2887 else badarg = TRUE;
2888 break;
2889
2890
2891 /* -U: This means "initial user submission" in sendmail, apparently. The
2892 doc claims that in future sendmail may refuse syntactically invalid
2893 messages instead of fixing them. For the moment, we just ignore it. */
2894
2895 case 'U':
2896 break;
2897
2898
2899 /* -v: verify things - this is a very low-level debugging */
2900
2901 case 'v':
2902 if (*argrest == 0)
2903 {
2904 debug_selector |= D_v;
2905 debug_file = stderr;
2906 }
2907 else badarg = TRUE;
2908 break;
2909
2910
2911 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2912
2913 The -x flag tells the sendmail command that mail from a local
2914 mail program has National Language Support (NLS) extended characters
2915 in the body of the mail item. The sendmail command can send mail with
2916 extended NLS characters across networks that normally corrupts these
2917 8-bit characters.
2918
2919 As Exim is 8-bit clean, it just ignores this flag. */
2920
2921 case 'x':
2922 if (*argrest != 0) badarg = TRUE;
2923 break;
2924
2925 /* All other initial characters are errors */
2926
2927 default:
2928 badarg = TRUE;
2929 break;
2930 } /* End of high-level switch statement */
2931
2932 /* Failed to recognize the option, or syntax error */
2933
2934 if (badarg)
2935 {
2936 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2937 "option %s\n", arg);
2938 exit(EXIT_FAILURE);
2939 }
2940 }
2941
2942
2943 /* If -R or -S have been specified without -q, assume a single queue run. */
2944
2945 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2946 queue_interval < 0) queue_interval = 0;
2947
2948
2949 END_ARG:
2950 /* If usage_wanted is set we call the usage function - which never returns */
2951 if (usage_wanted) exim_usage(called_as);
2952
2953 /* Arguments have been processed. Check for incompatibilities. */
2954 if ((
2955 (smtp_input || extract_recipients || recipients_arg < argc) &&
2956 (daemon_listen || queue_interval >= 0 || bi_option ||
2957 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2958 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2959 ) ||
2960 (
2961 msg_action_arg > 0 &&
2962 (daemon_listen || queue_interval >= 0 || list_options ||
2963 (checking && msg_action != MSG_LOAD) ||
2964 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2965 ) ||
2966 (
2967 (daemon_listen || queue_interval >= 0) &&
2968 (sender_address != NULL || list_options || list_queue || checking ||
2969 bi_option)
2970 ) ||
2971 (
2972 daemon_listen && queue_interval == 0
2973 ) ||
2974 (
2975 list_options &&
2976 (checking || smtp_input || extract_recipients ||
2977 filter_test != FTEST_NONE || bi_option)
2978 ) ||
2979 (
2980 verify_address_mode &&
2981 (address_test_mode || smtp_input || extract_recipients ||
2982 filter_test != FTEST_NONE || bi_option)
2983 ) ||
2984 (
2985 address_test_mode && (smtp_input || extract_recipients ||
2986 filter_test != FTEST_NONE || bi_option)
2987 ) ||
2988 (
2989 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2990 extract_recipients)
2991 ) ||
2992 (
2993 deliver_selectstring != NULL && queue_interval < 0
2994 ) ||
2995 (
2996 msg_action == MSG_LOAD &&
2997 (!expansion_test || expansion_test_message != NULL)
2998 )
2999 )
3000 {
3001 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3002 exit(EXIT_FAILURE);
3003 }
3004
3005 /* If debugging is set up, set the file and the file descriptor to pass on to
3006 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3007 to run in the foreground. */
3008
3009 if (debug_selector != 0)
3010 {
3011 debug_file = stderr;
3012 debug_fd = fileno(debug_file);
3013 background_daemon = FALSE;
3014 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3015 if (debug_selector != D_v) /* -v only doesn't show this */
3016 {
3017 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3018 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3019 debug_selector);
3020 show_whats_supported(stderr);
3021 }
3022 }
3023
3024 /* When started with root privilege, ensure that the limits on the number of
3025 open files and the number of processes (where that is accessible) are
3026 sufficiently large, or are unset, in case Exim has been called from an
3027 environment where the limits are screwed down. Not all OS have the ability to
3028 change some of these limits. */
3029
3030 if (unprivileged)
3031 {
3032 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3033 }
3034 else
3035 {
3036 struct rlimit rlp;
3037
3038 #ifdef RLIMIT_NOFILE
3039 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3040 {
3041 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3042 strerror(errno));
3043 rlp.rlim_cur = rlp.rlim_max = 0;
3044 }
3045
3046 /* I originally chose 1000 as a nice big number that was unlikely to
3047 be exceeded. It turns out that some older OS have a fixed upper limit of
3048 256. */
3049
3050 if (rlp.rlim_cur < 1000)
3051 {
3052 rlp.rlim_cur = rlp.rlim_max = 1000;
3053 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3054 {
3055 rlp.rlim_cur = rlp.rlim_max = 256;
3056 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3057 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3058 strerror(errno));
3059 }
3060 }
3061 #endif
3062
3063 #ifdef RLIMIT_NPROC
3064 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3065 {
3066 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3067 strerror(errno));
3068 rlp.rlim_cur = rlp.rlim_max = 0;
3069 }
3070
3071 #ifdef RLIM_INFINITY
3072 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3073 {
3074 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3075 #else
3076 if (rlp.rlim_cur < 1000)
3077 {
3078 rlp.rlim_cur = rlp.rlim_max = 1000;
3079 #endif
3080 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3081 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3082 strerror(errno));
3083 }
3084 #endif
3085 }
3086
3087 /* Exim is normally entered as root (but some special configurations are
3088 possible that don't do this). However, it always spins off sub-processes that
3089 set their uid and gid as required for local delivery. We don't want to pass on
3090 any extra groups that root may belong to, so we want to get rid of them all at
3091 this point.
3092
3093 We need to obey setgroups() at this stage, before possibly giving up root
3094 privilege for a changed configuration file, but later on we might need to
3095 check on the additional groups for the admin user privilege - can't do that
3096 till after reading the config, which might specify the exim gid. Therefore,
3097 save the group list here first. */
3098
3099 group_count = getgroups(NGROUPS_MAX, group_list);
3100
3101 /* There is a fundamental difference in some BSD systems in the matter of
3102 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3103 known not to be different. On the "different" systems there is a single group
3104 list, and the first entry in it is the current group. On all other versions of
3105 Unix there is a supplementary group list, which is in *addition* to the current
3106 group. Consequently, to get rid of all extraneous groups on a "standard" system
3107 you pass over 0 groups to setgroups(), while on a "different" system you pass
3108 over a single group - the current group, which is always the first group in the
3109 list. Calling setgroups() with zero groups on a "different" system results in
3110 an error return. The following code should cope with both types of system.
3111
3112 However, if this process isn't running as root, setgroups() can't be used
3113 since you have to be root to run it, even if throwing away groups. Not being
3114 root here happens only in some unusual configurations. We just ignore the
3115 error. */
3116
3117 if (setgroups(0, NULL) != 0)
3118 {
3119 if (setgroups(1, group_list) != 0 && !unprivileged)
3120 {
3121 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3122 exit(EXIT_FAILURE);
3123 }
3124 }
3125
3126 /* If the configuration file name has been altered by an argument on the
3127 command line (either a new file name or a macro definition) and the caller is
3128 not root, or if this is a filter testing run, remove any setuid privilege the
3129 program has and run as the underlying user.
3130
3131 The exim user is locked out of this, which severely restricts the use of -C
3132 for some purposes.
3133
3134 Otherwise, set the real ids to the effective values (should be root unless run
3135 from inetd, which it can either be root or the exim uid, if one is configured).
3136
3137 There is a private mechanism for bypassing some of this, in order to make it
3138 possible to test lots of configurations automatically, without having either to
3139 recompile each time, or to patch in an actual configuration file name and other
3140 values (such as the path name). If running in the test harness, pretend that
3141 configuration file changes and macro definitions haven't happened. */
3142
3143 if (( /* EITHER */
3144 (!trusted_config || macros != NULL) && /* Config changed, and */
3145 real_uid != root_uid && /* Not root, and */
3146 !running_in_test_harness /* Not fudged */
3147 ) || /* OR */
3148 expansion_test /* expansion testing */
3149 || /* OR */
3150 filter_test != FTEST_NONE) /* Filter testing */
3151 {
3152 setgroups(group_count, group_list);
3153 exim_setugid(real_uid, real_gid, FALSE,
3154 US"-C, -D, -be or -bf forces real uid");
3155 removed_privilege = TRUE;
3156
3157 /* In the normal case when Exim is called like this, stderr is available
3158 and should be used for any logging information because attempts to write
3159 to the log will usually fail. To arrange this, we unset really_exim. However,
3160 if no stderr is available there is no point - we might as well have a go
3161 at the log (if it fails, syslog will be written). */
3162
3163 if (log_stderr != NULL) really_exim = FALSE;
3164 }
3165
3166 /* Privilege is to be retained for the moment. It may be dropped later,
3167 depending on the job that this Exim process has been asked to do. For now, set
3168 the real uid to the effective so that subsequent re-execs of Exim are done by a
3169 privileged user. */
3170
3171 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3172
3173 /* If testing a filter, open the file(s) now, before wasting time doing other
3174 setups and reading the message. */
3175
3176 if ((filter_test & FTEST_SYSTEM) != 0)
3177 {
3178 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3179 if (filter_sfd < 0)
3180 {
3181 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3182 strerror(errno));
3183 return EXIT_FAILURE;
3184 }
3185 }
3186
3187 if ((filter_test & FTEST_USER) != 0)
3188 {
3189 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3190 if (filter_ufd < 0)
3191 {
3192 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3193 strerror(errno));
3194 return EXIT_FAILURE;
3195 }
3196 }
3197
3198 /* Read the main runtime configuration data; this gives up if there
3199 is a failure. It leaves the configuration file open so that the subsequent
3200 configuration data for delivery can be read if needed. */
3201
3202 readconf_main();
3203
3204 /* Handle the decoding of logging options. */
3205
3206 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3207 log_selector_string, log_options, log_options_count, US"log", 0);
3208
3209 DEBUG(D_any)
3210 {
3211 debug_printf("configuration file is %s\n", config_main_filename);
3212 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3213 log_extra_selector);
3214 }
3215
3216 /* If domain literals are not allowed, check the sender address that was
3217 supplied with -f. Ditto for a stripped trailing dot. */
3218
3219 if (sender_address != NULL)
3220 {
3221 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3222 {
3223 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3224 "allowed\n", sender_address);
3225 return EXIT_FAILURE;
3226 }
3227 if (f_end_dot && !strip_trailing_dot)
3228 {
3229 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3230 "(trailing dot not allowed)\n", sender_address);
3231 return EXIT_FAILURE;
3232 }
3233 }
3234
3235 /* Paranoia check of maximum lengths of certain strings. There is a check
3236 on the length of the log file path in log.c, which will come into effect
3237 if there are any calls to write the log earlier than this. However, if we
3238 get this far but the string is very long, it is better to stop now than to
3239 carry on and (e.g.) receive a message and then have to collapse. The call to
3240 log_write() from here will cause the ultimate panic collapse if the complete
3241 file name exceeds the buffer length. */
3242
3243 if (Ustrlen(log_file_path) > 200)
3244 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3245 "log_file_path is longer than 200 chars: aborting");
3246
3247 if (Ustrlen(pid_file_path) > 200)
3248 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3249 "pid_file_path is longer than 200 chars: aborting");
3250
3251 if (Ustrlen(spool_directory) > 200)
3252 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3253 "spool_directory is longer than 200 chars: aborting");
3254
3255 /* Length check on the process name given to syslog for its TAG field,
3256 which is only permitted to be 32 characters or less. See RFC 3164. */
3257
3258 if (Ustrlen(syslog_processname) > 32)
3259 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3260 "syslog_processname is longer than 32 chars: aborting");
3261
3262 /* In some operating systems, the environment variable TMPDIR controls where
3263 temporary files are created; Exim doesn't use these (apart from when delivering
3264 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3265 If TMPDIR is found in the environment, reset it to the value defined in the
3266 TMPDIR macro, if this macro is defined. */
3267
3268 #ifdef TMPDIR
3269 {
3270 uschar **p;
3271 for (p = USS environ; *p != NULL; p++)
3272 {
3273 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3274 Ustrcmp(*p+7, TMPDIR) != 0)
3275 {
3276 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3277 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3278 *p = newp;
3279 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3280 }
3281 }
3282 }
3283 #endif
3284
3285 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3286 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3287 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3288 called by a user who has set the TZ variable. This then affects the timestamps
3289 in log files and in Received: headers, and any created Date: header lines. The
3290 required timezone is settable in the configuration file, so nothing can be done
3291 about this earlier - but hopefully nothing will normally be logged earlier than
3292 this. We have to make a new environment if TZ is wrong, but don't bother if
3293 timestamps_utc is set, because then all times are in UTC anyway. */
3294
3295 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3296 {
3297 timestamps_utc = TRUE;
3298 }
3299 else
3300 {
3301 uschar *envtz = US getenv("TZ");
3302 if ((envtz == NULL && timezone_string != NULL) ||
3303 (envtz != NULL &&
3304 (timezone_string == NULL ||
3305 Ustrcmp(timezone_string, envtz) != 0)))
3306 {
3307 uschar **p = USS environ;
3308 uschar **new;
3309 uschar **newp;
3310 int count = 0;
3311 while (*p++ != NULL) count++;
3312 if (envtz == NULL) count++;
3313 newp = new = malloc(sizeof(uschar *) * (count + 1));
3314 for (p = USS environ; *p != NULL; p++)
3315 {
3316 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3317 *newp++ = *p;
3318 }
3319 if (timezone_string != NULL)
3320 {
3321 *newp = malloc(Ustrlen(timezone_string) + 4);
3322 sprintf(CS *newp++, "TZ=%s", timezone_string);
3323 }
3324 *newp = NULL;
3325 environ = CSS new;
3326 tzset();
3327 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3328 tod_stamp(tod_log));
3329 }
3330 }
3331
3332 /* Handle the case when we have removed the setuid privilege because of -C or
3333 -D. This means that the caller of Exim was not root.
3334
3335 There is a problem if we were running as the Exim user. The sysadmin may
3336 expect this case to retain privilege because "the binary was called by the
3337 Exim user", but it hasn't, because either the -D option set macros, or the
3338 -C option set a non-trusted configuration file. There are two possibilities:
3339
3340 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3341 to do message deliveries. Thus, the fact that it is running as a
3342 non-privileged user is plausible, and might be wanted in some special
3343 configurations. However, really_exim will have been set false when
3344 privilege was dropped, to stop Exim trying to write to its normal log
3345 files. Therefore, re-enable normal log processing, assuming the sysadmin
3346 has set up the log directory correctly.
3347
3348 (2) If deliver_drop_privilege is not set, the configuration won't work as
3349 apparently intended, and so we log a panic message. In order to retain
3350 root for -C or -D, the caller must either be root or be invoking a
3351 trusted configuration file (when deliver_drop_privilege is false). */
3352
3353 if (removed_privilege && (!trusted_config || macros != NULL) &&
3354 real_uid == exim_uid)
3355 {
3356 if (deliver_drop_privilege)
3357 really_exim = TRUE; /* let logging work normally */
3358 else
3359 log_write(0, LOG_MAIN|LOG_PANIC,
3360 "exim user lost privilege for using %s option",
3361 (int)exim_uid, trusted_config? "-D" : "-C");
3362 }
3363
3364 /* Start up Perl interpreter if Perl support is configured and there is a
3365 perl_startup option, and the configuration or the command line specifies
3366 initializing starting. Note that the global variables are actually called
3367 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3368
3369 #ifdef EXIM_PERL
3370 if (perl_start_option != 0)
3371 opt_perl_at_start = (perl_start_option > 0);
3372 if (opt_perl_at_start && opt_perl_startup != NULL)
3373 {
3374 uschar *errstr;
3375 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3376 errstr = init_perl(opt_perl_startup);
3377 if (errstr != NULL)
3378 {
3379 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3380 return EXIT_FAILURE;
3381 }
3382 opt_perl_started = TRUE;
3383 }
3384 #endif /* EXIM_PERL */
3385
3386 /* Log the arguments of the call if the configuration file said so. This is
3387 a debugging feature for finding out what arguments certain MUAs actually use.
3388 Don't attempt it if logging is disabled, or if listing variables or if
3389 verifying/testing addresses or expansions. */
3390
3391 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3392 && really_exim && !list_options && !checking)
3393 {
3394 int i;
3395 uschar *p = big_buffer;
3396 Ustrcpy(p, "cwd=");
3397 (void)getcwd(CS p+4, big_buffer_size - 4);
3398 while (*p) p++;
3399 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3400 while (*p) p++;
3401 for (i = 0; i < argc; i++)
3402 {
3403 int len = Ustrlen(argv[i]);
3404 uschar *printing;
3405 uschar *quote;
3406 if (p + len + 8 >= big_buffer + big_buffer_size)
3407 {
3408 Ustrcpy(p, " ...");
3409 log_write(0, LOG_MAIN, "%s", big_buffer);
3410 Ustrcpy(big_buffer, "...");
3411 p = big_buffer + 3;
3412 }
3413 printing = string_printing(argv[i]);
3414 if (printing[0] == 0) quote = US"\""; else
3415 {
3416 uschar *pp = printing;
3417 quote = US"";
3418 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3419 }
3420 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3421 (p - big_buffer) - 4), printing, quote);
3422 while (*p) p++;
3423 }
3424
3425 if ((log_extra_selector & LX_arguments) != 0)
3426 log_write(0, LOG_MAIN, "%s", big_buffer);
3427 else
3428 debug_printf("%s\n", big_buffer);
3429 }
3430
3431 /* Set the working directory to be the top-level spool directory. We don't rely
3432 on this in the code, which always uses fully qualified names, but it's useful
3433 for core dumps etc. Don't complain if it fails - the spool directory might not
3434 be generally accessible and calls with the -C option (and others) have lost
3435 privilege by now. Before the chdir, we try to ensure that the directory exists.
3436 */
3437
3438 if (Uchdir(spool_directory) != 0)
3439 {
3440 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3441 (void)Uchdir(spool_directory);
3442 }
3443
3444 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3445 alias file. Exim doesn't have such a concept, but this call is screwed into
3446 Sun's YP makefiles. Handle this by calling a configured script, as the real
3447 user who called Exim. The -oA option can be used to pass an argument to the
3448 script. */
3449
3450 if (bi_option)
3451 {
3452 (void)fclose(config_file);
3453 if (bi_command != NULL)
3454 {
3455 int i = 0;
3456 uschar *argv[3];
3457 argv[i++] = bi_command;
3458 if (alias_arg != NULL) argv[i++] = alias_arg;
3459 argv[i++] = NULL;
3460
3461 setgroups(group_count, group_list);
3462 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3463
3464 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3465 (argv[1] == NULL)? US"" : argv[1]);
3466
3467 execv(CS argv[0], (char *const *)argv);
3468 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3469 exit(EXIT_FAILURE);
3470 }
3471 else
3472 {
3473 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3474 exit(EXIT_SUCCESS);
3475 }
3476 }
3477
3478 /* If an action on specific messages is requested, or if a daemon or queue
3479 runner is being started, we need to know if Exim was called by an admin user.
3480 This is the case if the real user is root or exim, or if the real group is
3481 exim, or if one of the supplementary groups is exim or a group listed in
3482 admin_groups. We don't fail all message actions immediately if not admin_user,
3483 since some actions can be performed by non-admin users. Instead, set admin_user
3484 for later interrogation. */
3485
3486 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3487 admin_user = TRUE;
3488 else
3489 {
3490 int i, j;
3491 for (i = 0; i < group_count; i++)
3492 {
3493 if (group_list[i] == exim_gid) admin_user = TRUE;
3494 else if (admin_groups != NULL)
3495 {
3496 for (j = 1; j <= (int)(admin_groups[0]); j++)
3497 if (admin_groups[j] == group_list[i])
3498 { admin_user = TRUE; break; }
3499 }
3500 if (admin_user) break;
3501 }
3502 }
3503
3504 /* Another group of privileged users are the trusted users. These are root,
3505 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3506 are permitted to specify sender_addresses with -f on the command line, and
3507 other message parameters as well. */
3508
3509 if (real_uid == root_uid || real_uid == exim_uid)
3510 trusted_caller = TRUE;
3511 else
3512 {
3513 int i, j;
3514
3515 if (trusted_users != NULL)
3516 {
3517 for (i = 1; i <= (int)(trusted_users[0]); i++)
3518 if (trusted_users[i] == real_uid)
3519 { trusted_caller = TRUE; break; }
3520 }
3521
3522 if (!trusted_caller && trusted_groups != NULL)
3523 {
3524 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3525 {
3526 if (trusted_groups[i] == real_gid)
3527 trusted_caller = TRUE;
3528 else for (j = 0; j < group_count; j++)
3529 {
3530 if (trusted_groups[i] == group_list[j])
3531 { trusted_caller = TRUE; break; }
3532 }
3533 if (trusted_caller) break;
3534 }
3535 }
3536 }
3537
3538 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3539 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3540
3541 /* Only an admin user may start the daemon or force a queue run in the default
3542 configuration, but the queue run restriction can be relaxed. Only an admin
3543 user may request that a message be returned to its sender forthwith. Only an
3544 admin user may specify a debug level greater than D_v (because it might show
3545 passwords, etc. in lookup queries). Only an admin user may request a queue
3546 count. Only an admin user can use the test interface to scan for email
3547 (because Exim will be in the spool dir and able to look at mails). */
3548
3549 if (!admin_user)
3550 {
3551 BOOL debugset = (debug_selector & ~D_v) != 0;
3552 if (deliver_give_up || daemon_listen || malware_test_file ||
3553 (count_queue && queue_list_requires_admin) ||
3554 (list_queue && queue_list_requires_admin) ||
3555 (queue_interval >= 0 && prod_requires_admin) ||
3556 (debugset && !running_in_test_harness))
3557 {
3558 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3559 exit(EXIT_FAILURE);
3560 }
3561 }
3562
3563 /* If the real user is not root or the exim uid, the argument for passing
3564 in an open TCP/IP connection for another message is not permitted, nor is
3565 running with the -N option for any delivery action, unless this call to exim is
3566 one that supplied an input message, or we are using a patched exim for
3567 regression testing. */
3568
3569 if (real_uid != root_uid && real_uid != exim_uid &&
3570 (continue_hostname != NULL ||
3571 (dont_deliver &&
3572 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3573 )) && !running_in_test_harness)
3574 {
3575 fprintf(stderr, "exim: Permission denied\n");
3576 return EXIT_FAILURE;
3577 }
3578
3579 /* If the caller is not trusted, certain arguments are ignored when running for
3580 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3581 Note that authority for performing certain actions on messages is tested in the
3582 queue_action() function. */
3583
3584 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3585 {
3586 sender_host_name = sender_host_address = interface_address =
3587 sender_ident = received_protocol = NULL;
3588 sender_host_port = interface_port = 0;
3589 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3590 }
3591
3592 /* If a sender host address is set, extract the optional port number off the
3593 end of it and check its syntax. Do the same thing for the interface address.
3594 Exim exits if the syntax is bad. */
3595
3596 else
3597 {
3598 if (sender_host_address != NULL)
3599 sender_host_port = check_port(sender_host_address);
3600 if (interface_address != NULL)
3601 interface_port = check_port(interface_address);
3602 }
3603
3604 /* If an SMTP message is being received check to see if the standard input is a
3605 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3606 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3607 barf. */
3608
3609 if (smtp_input)
3610 {
3611 union sockaddr_46 inetd_sock;
3612 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3613 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3614 {
3615 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3616 if (family == AF_INET || family == AF_INET6)
3617 {
3618 union sockaddr_46 interface_sock;
3619 size = sizeof(interface_sock);
3620
3621 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3622 interface_address = host_ntoa(-1, &interface_sock, NULL,
3623 &interface_port);
3624
3625 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3626
3627 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3628 {
3629 is_inetd = TRUE;
3630 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3631 NULL, &sender_host_port);
3632 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3633 "inetd is not supported when mua_wrapper is set");
3634 }
3635 else
3636 {
3637 fprintf(stderr,
3638 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3639 return EXIT_FAILURE;
3640 }
3641 }
3642 }
3643 }
3644
3645 /* If the load average is going to be needed while receiving a message, get it
3646 now for those OS that require the first call to os_getloadavg() to be done as
3647 root. There will be further calls later for each message received. */
3648
3649 #ifdef LOAD_AVG_NEEDS_ROOT
3650 if (receiving_message &&
3651 (queue_only_load >= 0 ||
3652 (is_inetd && smtp_load_reserve >= 0)
3653 ))
3654 {
3655 load_average = OS_GETLOADAVG();
3656 }
3657 #endif
3658
3659 /* The queue_only configuration option can be overridden by -odx on the command
3660 line, except that if queue_only_override is false, queue_only cannot be unset
3661 from the command line. */
3662
3663 if (queue_only_set && (queue_only_override || arg_queue_only))
3664 queue_only = arg_queue_only;
3665
3666 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3667 -or and -os. */
3668
3669 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3670 if (arg_smtp_receive_timeout >= 0)
3671 smtp_receive_timeout = arg_smtp_receive_timeout;
3672
3673 /* If Exim was started with root privilege, unless we have already removed the
3674 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3675 except when starting the daemon or doing some kind of delivery or address
3676 testing (-bt). These are the only cases when root need to be retained. We run
3677 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3678 retained only for starting the daemon. We always do the initgroups() in this
3679 situation (controlled by the TRUE below), in order to be as close as possible
3680 to the state Exim usually runs in. */
3681
3682 if (!unprivileged && /* originally had root AND */
3683 !removed_privilege && /* still got root AND */
3684 !daemon_listen && /* not starting the daemon */
3685 queue_interval <= 0 && /* (either kind of daemon) */
3686 ( /* AND EITHER */
3687 deliver_drop_privilege || /* requested unprivileged */
3688 ( /* OR */
3689 queue_interval < 0 && /* not running the queue */
3690 (msg_action_arg < 0 || /* and */
3691 msg_action != MSG_DELIVER) && /* not delivering and */
3692 (!checking || !address_test_mode) /* not address checking */
3693 )
3694 ))
3695 {
3696 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3697 }
3698
3699 /* When we are retaining a privileged uid, we still change to the exim gid. */
3700
3701 else setgid(exim_gid);
3702
3703 /* Handle a request to scan a file for malware */
3704 if (malware_test_file)
3705 {
3706 #ifdef WITH_CONTENT_SCAN
3707 int result;
3708 set_process_info("scanning file for malware");
3709 result = malware_in_file(malware_test_file);
3710 if (result == FAIL)
3711 {
3712 printf("No malware found.\n");
3713 exit(EXIT_SUCCESS);
3714 }
3715 if (result != OK)
3716 {
3717 printf("Malware lookup returned non-okay/fail: %d\n", result);
3718 exit(EXIT_FAILURE);
3719 }
3720 if (malware_name)
3721 printf("Malware found: %s\n", malware_name);
3722 else
3723 printf("Malware scan detected malware of unknown name.\n");
3724 #else
3725 printf("Malware scanning not enabled at compile time.\n");
3726 #endif
3727 exit(EXIT_FAILURE);
3728 }
3729
3730 /* Handle a request to list the delivery queue */
3731
3732 if (list_queue)
3733 {
3734 set_process_info("listing the queue");
3735 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3736 exit(EXIT_SUCCESS);
3737 }
3738
3739 /* Handle a request to count the delivery queue */
3740
3741 if (count_queue)
3742 {
3743 set_process_info("counting the queue");
3744 queue_count();
3745 exit(EXIT_SUCCESS);
3746 }
3747
3748 /* Handle actions on specific messages, except for the force delivery and
3749 message load actions, which are done below. Some actions take a whole list of
3750 message ids, which are known to continue up to the end of the arguments. Others
3751 take a single message id and then operate on the recipients list. */
3752
3753 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3754 {
3755 int yield = EXIT_SUCCESS;
3756 set_process_info("acting on specified messages");
3757
3758 if (!one_msg_action)
3759 {
3760 for (i = msg_action_arg; i < argc; i++)
3761 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3762 yield = EXIT_FAILURE;
3763 }
3764
3765 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3766 recipients_arg)) yield = EXIT_FAILURE;
3767 exit(yield);
3768 }
3769
3770 /* All the modes below here require the remaining configuration sections
3771 to be read, except that we can skip over the ACL setting when delivering
3772 specific messages, or doing a queue run. (For various testing cases we could
3773 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3774 for skipping. */
3775
3776 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3777
3778 /* The configuration data will have been read into POOL_PERM because we won't
3779 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3780 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3781 configuration were read into POOL_MAIN, because we don't do any resets till
3782 later on. However, it seems right, and it does ensure that both pools get used.
3783 */
3784
3785 store_pool = POOL_MAIN;
3786
3787 /* Handle the -brt option. This is for checking out retry configurations.
3788 The next three arguments are a domain name or a complete address, and
3789 optionally two error numbers. All it does is to call the function that
3790 scans the retry configuration data. */
3791
3792 if (test_retry_arg >= 0)
3793 {
3794 retry_config *yield;
3795 int basic_errno = 0;
3796 int more_errno = 0;
3797 uschar *s1, *s2;
3798
3799 if (test_retry_arg >= argc)
3800 {
3801 printf("-brt needs a domain or address argument\n");
3802 exim_exit(EXIT_FAILURE);
3803 }
3804 s1 = argv[test_retry_arg++];
3805 s2 = NULL;
3806
3807 /* If the first argument contains no @ and no . it might be a local user
3808 or it might be a single-component name. Treat as a domain. */
3809
3810 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3811 {
3812 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3813 "being \ntreated as a one-component domain, not as a local part.\n\n",
3814 s1);
3815 }
3816
3817 /* There may be an optional second domain arg. */
3818
3819 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3820 s2 = argv[test_retry_arg++];
3821
3822 /* The final arg is an error name */
3823
3824 if (test_retry_arg < argc)
3825 {
3826 uschar *ss = argv[test_retry_arg];
3827 uschar *error =
3828 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3829 if (error != NULL)
3830 {
3831 printf("%s\n", CS error);
3832 return EXIT_FAILURE;
3833 }
3834
3835 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3836 code > 100 as an error is for matching codes to the decade. Turn them into
3837 a real error code, off the decade. */
3838
3839 if (basic_errno == ERRNO_MAIL4XX ||
3840 basic_errno == ERRNO_RCPT4XX ||
3841 basic_errno == ERRNO_DATA4XX)
3842 {
3843 int code = (more_errno >> 8) & 255;
3844 if (code == 255)
3845 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3846 else if (code > 100)
3847 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3848 }
3849 }
3850
3851 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3852 if (yield == NULL) printf("No retry information found\n"); else
3853 {
3854 retry_rule *r;
3855 more_errno = yield->more_errno;
3856 printf("Retry rule: %s ", yield->pattern);
3857
3858 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3859 {
3860 printf("quota%s%s ",
3861 (more_errno > 0)? "_" : "",
3862 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3863 }
3864 else if (yield->basic_errno == ECONNREFUSED)
3865 {
3866 printf("refused%s%s ",
3867 (more_errno > 0)? "_" : "",
3868 (more_errno == 'M')? "MX" :
3869 (more_errno == 'A')? "A" : "");
3870 }
3871 else if (yield->basic_errno == ETIMEDOUT)
3872 {
3873 printf("timeout");
3874 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3875 more_errno &= 255;
3876 if (more_errno != 0) printf("_%s",
3877 (more_errno == 'M')? "MX" : "A");
3878 printf(" ");
3879 }
3880 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3881 printf("auth_failed ");
3882 else printf("* ");
3883
3884 for (r = yield->rules; r != NULL; r = r->next)
3885 {
3886 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3887 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3888 if (r->rule == 'G')
3889 {
3890 int x = r->p2;
3891 int f = x % 1000;
3892 int d = 100;
3893 printf(",%d.", x/1000);
3894 do
3895 {
3896 printf("%d", f/d);
3897 f %= d;
3898 d /= 10;
3899 }
3900 while (f != 0);
3901 }
3902 printf("; ");
3903 }
3904
3905 printf("\n");
3906 }
3907 exim_exit(EXIT_SUCCESS);
3908 }
3909
3910 /* Handle a request to list one or more configuration options */
3911
3912 if (list_options)
3913 {
3914 set_process_info("listing variables");
3915 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3916 else for (i = recipients_arg; i < argc; i++)
3917 {
3918 if (i < argc - 1 &&
3919 (Ustrcmp(argv[i], "router") == 0 ||
3920 Ustrcmp(argv[i], "transport") == 0 ||
3921 Ustrcmp(argv[i], "authenticator") == 0 ||
3922 Ustrcmp(argv[i], "macro") == 0))
3923 {
3924 readconf_print(argv[i+1], argv[i]);
3925 i++;
3926 }
3927 else readconf_print(argv[i], NULL);
3928 }
3929 exim_exit(EXIT_SUCCESS);
3930 }
3931
3932
3933 /* Handle a request to deliver one or more messages that are already on the
3934 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3935 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3936
3937 Delivery of specific messages is typically used for a small number when
3938 prodding by hand (when the option forced_delivery will be set) or when
3939 re-execing to regain root privilege. Each message delivery must happen in a
3940 separate process, so we fork a process for each one, and run them sequentially
3941 so that debugging output doesn't get intertwined, and to avoid spawning too
3942 many processes if a long list is given. However, don't fork for the last one;
3943 this saves a process in the common case when Exim is called to deliver just one
3944 message. */
3945
3946 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3947 {
3948 if (prod_requires_admin && !admin_user)
3949 {
3950 fprintf(stderr, "exim: Permission denied\n");
3951 exim_exit(EXIT_FAILURE);
3952 }
3953 set_process_info("delivering specified messages");
3954 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3955 for (i = msg_action_arg; i < argc; i++)
3956 {
3957 int status;
3958 pid_t pid;
3959 if (i == argc - 1)
3960 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3961 else if ((pid = fork()) == 0)
3962 {
3963 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3964 _exit(EXIT_SUCCESS);
3965 }
3966 else if (pid < 0)
3967 {
3968 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3969 strerror(errno));
3970 exim_exit(EXIT_FAILURE);
3971 }
3972 else wait(&status);
3973 }
3974 exim_exit(EXIT_SUCCESS);
3975 }
3976
3977
3978 /* If only a single queue run is requested, without SMTP listening, we can just
3979 turn into a queue runner, with an optional starting message id. */
3980
3981 if (queue_interval == 0 && !daemon_listen)
3982 {
3983 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3984 (start_queue_run_id == NULL)? US"" : US" starting at ",
3985 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3986 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3987 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3988 set_process_info("running the queue (single queue run)");
3989 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3990 exim_exit(EXIT_SUCCESS);
3991 }
3992
3993
3994 /* Find the login name of the real user running this process. This is always
3995 needed when receiving a message, because it is written into the spool file. It
3996 may also be used to construct a from: or a sender: header, and in this case we
3997 need the user's full name as well, so save a copy of it, checked for RFC822
3998 syntax and munged if necessary, if it hasn't previously been set by the -F
3999 argument. We may try to get the passwd entry more than once, in case NIS or
4000 other delays are in evidence. Save the home directory for use in filter testing
4001 (only). */
4002
4003 for (i = 0;;)
4004 {
4005 if ((pw = getpwuid(real_uid)) != NULL)
4006 {
4007 originator_login = string_copy(US pw->pw_name);
4008 originator_home = string_copy(US pw->pw_dir);
4009
4010 /* If user name has not been set by -F, set it from the passwd entry
4011 unless -f has been used to set the sender address by a trusted user. */
4012
4013 if (originator_name == NULL)
4014 {
4015 if (sender_address == NULL ||
4016 (!trusted_caller && filter_test == FTEST_NONE))
4017 {
4018 uschar *name = US pw->pw_gecos;
4019 uschar *amp = Ustrchr(name, '&');
4020 uschar buffer[256];
4021
4022 /* Most Unix specify that a '&' character in the gecos field is
4023 replaced by a copy of the login name, and some even specify that
4024 the first character should be upper cased, so that's what we do. */
4025
4026 if (amp != NULL)
4027 {
4028 int loffset;
4029 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4030 amp - name, name, &loffset, originator_login, amp + 1);
4031 buffer[loffset] = toupper(buffer[loffset]);
4032 name = buffer;
4033 }
4034
4035 /* If a pattern for matching the gecos field was supplied, apply
4036 it and then expand the name string. */
4037
4038 if (gecos_pattern != NULL && gecos_name != NULL)
4039 {
4040 const pcre *re;
4041 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4042
4043 if (regex_match_and_setup(re, name, 0, -1))
4044 {
4045 uschar *new_name = expand_string(gecos_name);
4046 expand_nmax = -1;
4047 if (new_name != NULL)
4048 {
4049 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4050 "gecos field \"%s\"\n", new_name, name);
4051 name = new_name;
4052 }
4053 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4054 "\"%s\": %s\n", gecos_name, expand_string_message);
4055 }
4056 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4057 "gecos field \"%s\"\n", gecos_pattern, name);
4058 store_free((void *)re);
4059 }
4060 originator_name = string_copy(name);
4061 }
4062
4063 /* A trusted caller has used -f but not -F */
4064
4065 else originator_name = US"";
4066 }
4067
4068 /* Break the retry loop */
4069
4070 break;
4071 }
4072
4073 if (++i > finduser_retries) break;
4074 sleep(1);
4075 }
4076
4077 /* If we cannot get a user login, log the incident and give up, unless the
4078 configuration specifies something to use. When running in the test harness,
4079 any setting of unknown_login overrides the actual name. */
4080
4081 if (originator_login == NULL || running_in_test_harness)
4082 {
4083 if (unknown_login != NULL)
4084 {
4085 originator_login = expand_string(unknown_login);
4086 if (originator_name == NULL && unknown_username != NULL)
4087 originator_name = expand_string(unknown_username);
4088 if (originator_name == NULL) originator_name = US"";
4089 }
4090 if (originator_login == NULL)
4091 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4092 (int)real_uid);
4093 }
4094
4095 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4096 RFC822 address.*/
4097