36f7a1b3d648b3d67acc5f3ae96d623baa5c4bb0
[exim.git] / src / src / exim.c
1 /* $Cambridge: exim/src/src/exim.c,v 1.68 2010/06/06 02:08:50 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: %d\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 exim_gid = pw->pw_gid;
1238 }
1239 else
1240 {
1241 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1242 EXIM_USERNAME);
1243 exit(EXIT_FAILURE);
1244 }
1245 #endif
1246
1247 #ifdef EXIM_GROUPNAME
1248 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1249 {
1250 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1251 EXIM_GROUPNAME);
1252 exit(EXIT_FAILURE);
1253 }
1254 #endif
1255
1256 #ifdef CONFIGURE_OWNERNAME
1257 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1258 {
1259 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1260 CONFIGURE_OWNERNAME);
1261 exit(EXIT_FAILURE);
1262 }
1263 #endif
1264
1265 #ifdef CONFIGURE_GROUPNAME
1266 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1267 {
1268 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1269 CONFIGURE_GROUPNAME);
1270 exit(EXIT_FAILURE);
1271 }
1272 #endif
1273
1274 /* In the Cygwin environment, some initialization needs doing. It is fudged
1275 in by means of this macro. */
1276
1277 #ifdef OS_INIT
1278 OS_INIT
1279 #endif
1280
1281 /* Check a field which is patched when we are running Exim within its
1282 testing harness; do a fast initial check, and then the whole thing. */
1283
1284 running_in_test_harness =
1285 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1286
1287 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1288 at the start of a program; however, it seems that some environments do not
1289 follow this. A "strange" locale can affect the formatting of timestamps, so we
1290 make quite sure. */
1291
1292 setlocale(LC_ALL, "C");
1293
1294 /* Set up the default handler for timing using alarm(). */
1295
1296 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1297
1298 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1299 because store_malloc writes a log entry on failure. */
1300
1301 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1302 if (log_buffer == NULL)
1303 {
1304 fprintf(stderr, "exim: failed to get store for log buffer\n");
1305 exit(EXIT_FAILURE);
1306 }
1307
1308 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1309 NULL when the daemon is run and the file is closed. We have to use this
1310 indirection, because some systems don't allow writing to the variable "stderr".
1311 */
1312
1313 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1314
1315 /* Arrange for the PCRE regex library to use our store functions. Note that
1316 the normal calls are actually macros that add additional arguments for
1317 debugging purposes so we have to assign specially constructed functions here.
1318 The default is to use store in the stacking pool, but this is overridden in the
1319 regex_must_compile() function. */
1320
1321 pcre_malloc = function_store_get;
1322 pcre_free = function_dummy_free;
1323
1324 /* Ensure there is a big buffer for temporary use in several places. It is put
1325 in malloc store so that it can be freed for enlargement if necessary. */
1326
1327 big_buffer = store_malloc(big_buffer_size);
1328
1329 /* Set up the handler for the data request signal, and set the initial
1330 descriptive text. */
1331
1332 set_process_info("initializing");
1333 os_restarting_signal(SIGUSR1, usr1_handler);
1334
1335 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1336 in the daemon code. For the rest of Exim's uses, we ignore it. */
1337
1338 signal(SIGHUP, SIG_IGN);
1339
1340 /* We don't want to die on pipe errors as the code is written to handle
1341 the write error instead. */
1342
1343 signal(SIGPIPE, SIG_IGN);
1344
1345 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1346 set to SIG_IGN. This causes subprocesses that complete before the parent
1347 process waits for them not to hang around, so when Exim calls wait(), nothing
1348 is there. The wait() code has been made robust against this, but let's ensure
1349 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1350 ending status. We use sigaction rather than plain signal() on those OS where
1351 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1352 problem on AIX with this.) */
1353
1354 #ifdef SA_NOCLDWAIT
1355 {
1356 struct sigaction act;
1357 act.sa_handler = SIG_DFL;
1358 sigemptyset(&(act.sa_mask));
1359 act.sa_flags = 0;
1360 sigaction(SIGCHLD, &act, NULL);
1361 }
1362 #else
1363 signal(SIGCHLD, SIG_DFL);
1364 #endif
1365
1366 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1367 SIGHUP. */
1368
1369 sighup_argv = argv;
1370
1371 /* Set up the version number. Set up the leading 'E' for the external form of
1372 message ids, set the pointer to the internal form, and initialize it to
1373 indicate no message being processed. */
1374
1375 version_init();
1376 message_id_option[0] = '-';
1377 message_id_external = message_id_option + 1;
1378 message_id_external[0] = 'E';
1379 message_id = message_id_external + 1;
1380 message_id[0] = 0;
1381
1382 /* Set the umask to zero so that any files Exim creates using open() are
1383 created with the modes that it specifies. NOTE: Files created with fopen() have
1384 a problem, which was not recognized till rather late (February 2006). With this
1385 umask, such files will be world writeable. (They are all content scanning files
1386 in the spool directory, which isn't world-accessible, so this is not a
1387 disaster, but it's untidy.) I don't want to change this overall setting,
1388 however, because it will interact badly with the open() calls. Instead, there's
1389 now a function called modefopen() that fiddles with the umask while calling
1390 fopen(). */
1391
1392 (void)umask(0);
1393
1394 /* Precompile the regular expression for matching a message id. Keep this in
1395 step with the code that generates ids in the accept.c module. We need to do
1396 this here, because the -M options check their arguments for syntactic validity
1397 using mac_ismsgid, which uses this. */
1398
1399 regex_ismsgid =
1400 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1401
1402 /* Precompile the regular expression that is used for matching an SMTP error
1403 code, possibly extended, at the start of an error message. Note that the
1404 terminating whitespace character is included. */
1405
1406 regex_smtp_code =
1407 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1408 FALSE, TRUE);
1409
1410 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1411 this seems to be a generally accepted convention, since one finds symbolic
1412 links called "mailq" in standard OS configurations. */
1413
1414 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1415 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1416 {
1417 list_queue = TRUE;
1418 receiving_message = FALSE;
1419 called_as = US"-mailq";
1420 }
1421
1422 /* If the program is called as "rmail" treat it as equivalent to
1423 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1424 i.e. preventing a single dot on a line from terminating the message, and
1425 returning with zero return code, even in cases of error (provided an error
1426 message has been sent). */
1427
1428 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1429 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1430 {
1431 dot_ends = FALSE;
1432 called_as = US"-rmail";
1433 errors_sender_rc = EXIT_SUCCESS;
1434 }
1435
1436 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1437 this is a smail convention. */
1438
1439 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1440 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1441 {
1442 smtp_input = smtp_batched_input = TRUE;
1443 called_as = US"-rsmtp";
1444 }
1445
1446 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1447 this is a smail convention. */
1448
1449 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1450 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1451 {
1452 queue_interval = 0;
1453 receiving_message = FALSE;
1454 called_as = US"-runq";
1455 }
1456
1457 /* If the program is called as "newaliases" treat it as equivalent to
1458 "exim -bi"; this is a sendmail convention. */
1459
1460 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1461 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1462 {
1463 bi_option = TRUE;
1464 receiving_message = FALSE;
1465 called_as = US"-newaliases";
1466 }
1467
1468 /* Save the original effective uid for a couple of uses later. It should
1469 normally be root, but in some esoteric environments it may not be. */
1470
1471 original_euid = geteuid();
1472
1473 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1474 to be the same as the real ones. This makes a difference only if Exim is setuid
1475 (or setgid) to something other than root, which could be the case in some
1476 special configurations. */
1477
1478 real_uid = getuid();
1479 real_gid = getgid();
1480
1481 if (real_uid == root_uid)
1482 {
1483 setgid(real_gid);
1484 setuid(real_uid);
1485 }
1486
1487 /* If neither the original real uid nor the original euid was root, Exim is
1488 running in an unprivileged state. */
1489
1490 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1491
1492 /* Scan the program's arguments. Some can be dealt with right away; others are
1493 simply recorded for checking and handling afterwards. Do a high-level switch
1494 on the second character (the one after '-'), to save some effort. */
1495
1496 for (i = 1; i < argc; i++)
1497 {
1498 BOOL badarg = FALSE;
1499 uschar *arg = argv[i];
1500 uschar *argrest;
1501 int switchchar;
1502
1503 /* An argument not starting with '-' is the start of a recipients list;
1504 break out of the options-scanning loop. */
1505
1506 if (arg[0] != '-')
1507 {
1508 recipients_arg = i;
1509 break;
1510 }
1511
1512 /* An option consistion of -- terminates the options */
1513
1514 if (Ustrcmp(arg, "--") == 0)
1515 {
1516 recipients_arg = i + 1;
1517 break;
1518 }
1519
1520 /* Handle flagged options */
1521
1522 switchchar = arg[1];
1523 argrest = arg+2;
1524
1525 /* Make all -ex options synonymous with -oex arguments, since that
1526 is assumed by various callers. Also make -qR options synonymous with -R
1527 options, as that seems to be required as well. Allow for -qqR too, and
1528 the same for -S options. */
1529
1530 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1531 Ustrncmp(arg+1, "qR", 2) == 0 ||
1532 Ustrncmp(arg+1, "qS", 2) == 0)
1533 {
1534 switchchar = arg[2];
1535 argrest++;
1536 }
1537 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1538 {
1539 switchchar = arg[3];
1540 argrest += 2;
1541 queue_2stage = TRUE;
1542 }
1543
1544 /* Make -r synonymous with -f, since it is a documented alias */
1545
1546 else if (arg[1] == 'r') switchchar = 'f';
1547
1548 /* Make -ov synonymous with -v */
1549
1550 else if (Ustrcmp(arg, "-ov") == 0)
1551 {
1552 switchchar = 'v';
1553 argrest++;
1554 }
1555
1556 /* deal with --option_aliases */
1557 else if (switchchar == '-')
1558 {
1559 if (Ustrcmp(argrest, "help") == 0)
1560 {
1561 usage_wanted = TRUE;
1562 break;
1563 }
1564 else if (Ustrcmp(argrest, "version") == 0)
1565 {
1566 switchchar = 'b';
1567 argrest = "V";
1568 }
1569 }
1570
1571 /* High-level switch on active initial letter */
1572
1573 switch(switchchar)
1574 {
1575 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1576 so has no need of it. */
1577
1578 case 'B':
1579 if (*argrest == 0) i++; /* Skip over the type */
1580 break;
1581
1582
1583 case 'b':
1584 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1585
1586 /* -bd: Run in daemon mode, awaiting SMTP connections.
1587 -bdf: Ditto, but in the foreground.
1588 */
1589
1590 if (*argrest == 'd')
1591 {
1592 daemon_listen = TRUE;
1593 if (*(++argrest) == 'f') background_daemon = FALSE;
1594 else if (*argrest != 0) { badarg = TRUE; break; }
1595 }
1596
1597 /* -be: Run in expansion test mode
1598 -bem: Ditto, but read a message from a file first
1599 */
1600
1601 else if (*argrest == 'e')
1602 {
1603 expansion_test = checking = TRUE;
1604 if (argrest[1] == 'm')
1605 {
1606 if (++i >= argc) { badarg = TRUE; break; }
1607 expansion_test_message = argv[i];
1608 argrest++;
1609 }
1610 if (argrest[1] != 0) { badarg = TRUE; break; }
1611 }
1612
1613 /* -bF: Run system filter test */
1614
1615 else if (*argrest == 'F')
1616 {
1617 filter_test |= FTEST_SYSTEM;
1618 if (*(++argrest) != 0) { badarg = TRUE; break; }
1619 if (++i < argc) filter_test_sfile = argv[i]; else
1620 {
1621 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1622 exit(EXIT_FAILURE);
1623 }
1624 }
1625
1626 /* -bf: Run user filter test
1627 -bfd: Set domain for filter testing
1628 -bfl: Set local part for filter testing
1629 -bfp: Set prefix for filter testing
1630 -bfs: Set suffix for filter testing
1631 */
1632
1633 else if (*argrest == 'f')
1634 {
1635 if (*(++argrest) == 0)
1636 {
1637 filter_test |= FTEST_USER;
1638 if (++i < argc) filter_test_ufile = argv[i]; else
1639 {
1640 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1641 exit(EXIT_FAILURE);
1642 }
1643 }
1644 else
1645 {
1646 if (++i >= argc)
1647 {
1648 fprintf(stderr, "exim: string expected after %s\n", arg);
1649 exit(EXIT_FAILURE);
1650 }
1651 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1652 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1653 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1654 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1655 else { badarg = TRUE; break; }
1656 }
1657 }
1658
1659 /* -bh: Host checking - an IP address must follow. */
1660
1661 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1662 {
1663 if (++i >= argc) { badarg = TRUE; break; }
1664 sender_host_address = argv[i];
1665 host_checking = checking = log_testing_mode = TRUE;
1666 host_checking_callout = argrest[1] == 'c';
1667 }
1668
1669 /* -bi: This option is used by sendmail to initialize *the* alias file,
1670 though it has the -oA option to specify a different file. Exim has no
1671 concept of *the* alias file, but since Sun's YP make script calls
1672 sendmail this way, some support must be provided. */
1673
1674 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1675
1676 /* -bm: Accept and deliver message - the default option. Reinstate
1677 receiving_message, which got turned off for all -b options. */
1678
1679 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1680
1681 /* -bmalware: test the filename given for malware */
1682
1683 else if (Ustrcmp(argrest, "malware") == 0)
1684 {
1685 if (++i >= argc) { badarg = TRUE; break; }
1686 malware_test_file = argv[i];
1687 }
1688
1689 /* -bnq: For locally originating messages, do not qualify unqualified
1690 addresses. In the envelope, this causes errors; in header lines they
1691 just get left. */
1692
1693 else if (Ustrcmp(argrest, "nq") == 0)
1694 {
1695 allow_unqualified_sender = FALSE;
1696 allow_unqualified_recipient = FALSE;
1697 }
1698
1699 /* -bpxx: List the contents of the mail queue, in various forms. If
1700 the option is -bpc, just a queue count is needed. Otherwise, if the
1701 first letter after p is r, then order is random. */
1702
1703 else if (*argrest == 'p')
1704 {
1705 if (*(++argrest) == 'c')
1706 {
1707 count_queue = TRUE;
1708 if (*(++argrest) != 0) badarg = TRUE;
1709 break;
1710 }
1711
1712 if (*argrest == 'r')
1713 {
1714 list_queue_option = 8;
1715 argrest++;
1716 }
1717 else list_queue_option = 0;
1718
1719 list_queue = TRUE;
1720
1721 /* -bp: List the contents of the mail queue, top-level only */
1722
1723 if (*argrest == 0) {}
1724
1725 /* -bpu: List the contents of the mail queue, top-level undelivered */
1726
1727 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1728
1729 /* -bpa: List the contents of the mail queue, including all delivered */
1730
1731 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1732
1733 /* Unknown after -bp[r] */
1734
1735 else
1736 {
1737 badarg = TRUE;
1738 break;
1739 }
1740 }
1741
1742
1743 /* -bP: List the configuration variables given as the address list.
1744 Force -v, so configuration errors get displayed. */
1745
1746 else if (Ustrcmp(argrest, "P") == 0)
1747 {
1748 list_options = TRUE;
1749 debug_selector |= D_v;
1750 debug_file = stderr;
1751 }
1752
1753 /* -brt: Test retry configuration lookup */
1754
1755 else if (Ustrcmp(argrest, "rt") == 0)
1756 {
1757 test_retry_arg = i + 1;
1758 goto END_ARG;
1759 }
1760
1761 /* -brw: Test rewrite configuration */
1762
1763 else if (Ustrcmp(argrest, "rw") == 0)
1764 {
1765 test_rewrite_arg = i + 1;
1766 goto END_ARG;
1767 }
1768
1769 /* -bS: Read SMTP commands on standard input, but produce no replies -
1770 all errors are reported by sending messages. */
1771
1772 else if (Ustrcmp(argrest, "S") == 0)
1773 smtp_input = smtp_batched_input = receiving_message = TRUE;
1774
1775 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1776 on standard output. */
1777
1778 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1779
1780 /* -bt: address testing mode */
1781
1782 else if (Ustrcmp(argrest, "t") == 0)
1783 address_test_mode = checking = log_testing_mode = TRUE;
1784
1785 /* -bv: verify addresses */
1786
1787 else if (Ustrcmp(argrest, "v") == 0)
1788 verify_address_mode = checking = log_testing_mode = TRUE;
1789
1790 /* -bvs: verify sender addresses */
1791
1792 else if (Ustrcmp(argrest, "vs") == 0)
1793 {
1794 verify_address_mode = checking = log_testing_mode = TRUE;
1795 verify_as_sender = TRUE;
1796 }
1797
1798 /* -bV: Print version string and support details */
1799
1800 else if (Ustrcmp(argrest, "V") == 0)
1801 {
1802 printf("Exim version %s #%s built %s\n", version_string,
1803 version_cnumber, version_date);
1804 printf("%s\n", CS version_copyright);
1805 version_printed = TRUE;
1806 show_whats_supported(stdout);
1807 }
1808
1809 else badarg = TRUE;
1810 break;
1811
1812
1813 /* -C: change configuration file list; ignore if it isn't really
1814 a change! Enforce a prefix check if required. */
1815
1816 case 'C':
1817 if (*argrest == 0)
1818 {
1819 if(++i < argc) argrest = argv[i]; else
1820 { badarg = TRUE; break; }
1821 }
1822 if (Ustrcmp(config_main_filelist, argrest) != 0)
1823 {
1824 #ifdef ALT_CONFIG_PREFIX
1825 int sep = 0;
1826 int len = Ustrlen(ALT_CONFIG_PREFIX);
1827 uschar *list = argrest;
1828 uschar *filename;
1829 while((filename = string_nextinlist(&list, &sep, big_buffer,
1830 big_buffer_size)) != NULL)
1831 {
1832 if ((Ustrlen(filename) < len ||
1833 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1834 Ustrstr(filename, "/../") != NULL) &&
1835 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1836 {
1837 fprintf(stderr, "-C Permission denied\n");
1838 exit(EXIT_FAILURE);
1839 }
1840 }
1841 #endif
1842
1843 config_main_filelist = argrest;
1844 config_changed = TRUE;
1845 }
1846 break;
1847
1848
1849 /* -D: set up a macro definition */
1850
1851 case 'D':
1852 #ifdef DISABLE_D_OPTION
1853 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1854 exit(EXIT_FAILURE);
1855 #else
1856 {
1857 int ptr = 0;
1858 macro_item *mlast = NULL;
1859 macro_item *m;
1860 uschar name[24];
1861 uschar *s = argrest;
1862
1863 while (isspace(*s)) s++;
1864
1865 if (*s < 'A' || *s > 'Z')
1866 {
1867 fprintf(stderr, "exim: macro name set by -D must start with "
1868 "an upper case letter\n");
1869 exit(EXIT_FAILURE);
1870 }
1871
1872 while (isalnum(*s) || *s == '_')
1873 {
1874 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1875 s++;
1876 }
1877 name[ptr] = 0;
1878 if (ptr == 0) { badarg = TRUE; break; }
1879 while (isspace(*s)) s++;
1880 if (*s != 0)
1881 {
1882 if (*s++ != '=') { badarg = TRUE; break; }
1883 while (isspace(*s)) s++;
1884 }
1885
1886 for (m = macros; m != NULL; m = m->next)
1887 {
1888 if (Ustrcmp(m->name, name) == 0)
1889 {
1890 fprintf(stderr, "exim: duplicated -D in command line\n");
1891 exit(EXIT_FAILURE);
1892 }
1893 mlast = m;
1894 }
1895
1896 m = store_get(sizeof(macro_item) + Ustrlen(name));
1897 m->next = NULL;
1898 m->command_line = TRUE;
1899 if (mlast == NULL) macros = m; else mlast->next = m;
1900 Ustrcpy(m->name, name);
1901 m->replacement = string_copy(s);
1902
1903 if (clmacro_count >= MAX_CLMACROS)
1904 {
1905 fprintf(stderr, "exim: too many -D options on command line\n");
1906 exit(EXIT_FAILURE);
1907 }
1908 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1909 m->replacement);
1910 }
1911 #endif
1912 break;
1913
1914 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1915 The latter is now a no-op, retained for compatibility only. If -dd is used,
1916 debugging subprocesses of the daemon is disabled. */
1917
1918 case 'd':
1919 if (Ustrcmp(argrest, "ropcr") == 0)
1920 {
1921 /* drop_cr = TRUE; */
1922 }
1923
1924 /* Use an intermediate variable so that we don't set debugging while
1925 decoding the debugging bits. */
1926
1927 else
1928 {
1929 unsigned int selector = D_default;
1930 debug_selector = 0;
1931 debug_file = NULL;
1932 if (*argrest == 'd')
1933 {
1934 debug_daemon = TRUE;
1935 argrest++;
1936 }
1937 if (*argrest != 0)
1938 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1939 debug_options_count, US"debug", 0);
1940 debug_selector = selector;
1941 }
1942 break;
1943
1944
1945 /* -E: This is a local error message. This option is not intended for
1946 external use at all, but is not restricted to trusted callers because it
1947 does no harm (just suppresses certain error messages) and if Exim is run
1948 not setuid root it won't always be trusted when it generates error
1949 messages using this option. If there is a message id following -E, point
1950 message_reference at it, for logging. */
1951
1952 case 'E':
1953 local_error_message = TRUE;
1954 if (mac_ismsgid(argrest)) message_reference = argrest;
1955 break;
1956
1957
1958 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1959 option, so it looks as if historically the -oex options are also callable
1960 without the leading -o. So we have to accept them. Before the switch,
1961 anything starting -oe has been converted to -e. Exim does not support all
1962 of the sendmail error options. */
1963
1964 case 'e':
1965 if (Ustrcmp(argrest, "e") == 0)
1966 {
1967 arg_error_handling = ERRORS_SENDER;
1968 errors_sender_rc = EXIT_SUCCESS;
1969 }
1970 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1971 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1972 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1973 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1974 else badarg = TRUE;
1975 break;
1976
1977
1978 /* -F: Set sender's full name, used instead of the gecos entry from
1979 the password file. Since users can usually alter their gecos entries,
1980 there's no security involved in using this instead. The data can follow
1981 the -F or be in the next argument. */
1982
1983 case 'F':
1984 if (*argrest == 0)
1985 {
1986 if(++i < argc) argrest = argv[i]; else
1987 { badarg = TRUE; break; }
1988 }
1989 originator_name = argrest;
1990 sender_name_forced = TRUE;
1991 break;
1992
1993
1994 /* -f: Set sender's address - this value is only actually used if Exim is
1995 run by a trusted user, or if untrusted_set_sender is set and matches the
1996 address, except that the null address can always be set by any user. The
1997 test for this happens later, when the value given here is ignored when not
1998 permitted. For an untrusted user, the actual sender is still put in Sender:
1999 if it doesn't match the From: header (unless no_local_from_check is set).
2000 The data can follow the -f or be in the next argument. The -r switch is an
2001 obsolete form of -f but since there appear to be programs out there that
2002 use anything that sendmail has ever supported, better accept it - the
2003 synonymizing is done before the switch above.
2004
2005 At this stage, we must allow domain literal addresses, because we don't
2006 know what the setting of allow_domain_literals is yet. Ditto for trailing
2007 dots and strip_trailing_dot. */
2008
2009 case 'f':
2010 {
2011 int start, end;
2012 uschar *errmess;
2013 if (*argrest == 0)
2014 {
2015 if (i+1 < argc) argrest = argv[++i]; else
2016 { badarg = TRUE; break; }
2017 }
2018 if (*argrest == 0)
2019 {
2020 sender_address = string_sprintf(""); /* Ensure writeable memory */
2021 }
2022 else
2023 {
2024 uschar *temp = argrest + Ustrlen(argrest) - 1;
2025 while (temp >= argrest && isspace(*temp)) temp--;
2026 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2027 allow_domain_literals = TRUE;
2028 strip_trailing_dot = TRUE;
2029 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2030 &sender_address_domain, TRUE);
2031 allow_domain_literals = FALSE;
2032 strip_trailing_dot = FALSE;
2033 if (sender_address == NULL)
2034 {
2035 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2036 return EXIT_FAILURE;
2037 }
2038 }
2039 sender_address_forced = TRUE;
2040 }
2041 break;
2042
2043 /* This is some Sendmail thing which can be ignored */
2044
2045 case 'G':
2046 break;
2047
2048 /* -h: Set the hop count for an incoming message. Exim does not currently
2049 support this; it always computes it by counting the Received: headers.
2050 To put it in will require a change to the spool header file format. */
2051
2052 case 'h':
2053 if (*argrest == 0)
2054 {
2055 if(++i < argc) argrest = argv[i]; else
2056 { badarg = TRUE; break; }
2057 }
2058 if (!isdigit(*argrest)) badarg = TRUE;
2059 break;
2060
2061
2062 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2063 not to be documented for sendmail but mailx (at least) uses it) */
2064
2065 case 'i':
2066 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2067 break;
2068
2069
2070 case 'M':
2071 receiving_message = FALSE;
2072
2073 /* -MC: continue delivery of another message via an existing open
2074 file descriptor. This option is used for an internal call by the
2075 smtp transport when there is a pending message waiting to go to an
2076 address to which it has got a connection. Five subsequent arguments are
2077 required: transport name, host name, IP address, sequence number, and
2078 message_id. Transports may decline to create new processes if the sequence
2079 number gets too big. The channel is stdin. This (-MC) must be the last
2080 argument. There's a subsequent check that the real-uid is privileged.
2081
2082 If we are running in the test harness. delay for a bit, to let the process
2083 that set this one up complete. This makes for repeatability of the logging,
2084 etc. output. */
2085
2086 if (Ustrcmp(argrest, "C") == 0)
2087 {
2088 union sockaddr_46 interface_sock;
2089 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2090
2091 if (argc != i + 6)
2092 {
2093 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2094 return EXIT_FAILURE;
2095 }
2096
2097 if (msg_action_arg >= 0)
2098 {
2099 fprintf(stderr, "exim: incompatible arguments\n");
2100 return EXIT_FAILURE;
2101 }
2102
2103 continue_transport = argv[++i];
2104 continue_hostname = argv[++i];
2105 continue_host_address = argv[++i];
2106 continue_sequence = Uatoi(argv[++i]);
2107 msg_action = MSG_DELIVER;
2108 msg_action_arg = ++i;
2109 forced_delivery = TRUE;
2110 queue_run_pid = passed_qr_pid;
2111 queue_run_pipe = passed_qr_pipe;
2112
2113 if (!mac_ismsgid(argv[i]))
2114 {
2115 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2116 argv[i]);
2117 return EXIT_FAILURE;
2118 }
2119
2120 /* Set up $sending_ip_address and $sending_port */
2121
2122 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2123 &size) == 0)
2124 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2125 &sending_port);
2126 else
2127 {
2128 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2129 strerror(errno));
2130 return EXIT_FAILURE;
2131 }
2132
2133 if (running_in_test_harness) millisleep(500);
2134 break;
2135 }
2136
2137 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2138 precedes -MC (see above). The flag indicates that the host to which
2139 Exim is connected has accepted an AUTH sequence. */
2140
2141 else if (Ustrcmp(argrest, "CA") == 0)
2142 {
2143 smtp_authenticated = TRUE;
2144 break;
2145 }
2146
2147 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2148 it preceded -MC (see above) */
2149
2150 else if (Ustrcmp(argrest, "CP") == 0)
2151 {
2152 smtp_use_pipelining = TRUE;
2153 break;
2154 }
2155
2156 /* -MCQ: pass on the pid of the queue-running process that started
2157 this chain of deliveries and the fd of its synchronizing pipe; this
2158 is useful only when it precedes -MC (see above) */
2159
2160 else if (Ustrcmp(argrest, "CQ") == 0)
2161 {
2162 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2163 else badarg = TRUE;
2164 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2165 else badarg = TRUE;
2166 break;
2167 }
2168
2169 /* -MCS: set the smtp_use_size flag; this is useful only when it
2170 precedes -MC (see above) */
2171
2172 else if (Ustrcmp(argrest, "CS") == 0)
2173 {
2174 smtp_use_size = TRUE;
2175 break;
2176 }
2177
2178 /* -MCT: set the tls_offered flag; this is useful only when it
2179 precedes -MC (see above). The flag indicates that the host to which
2180 Exim is connected has offered TLS support. */
2181
2182 #ifdef SUPPORT_TLS
2183 else if (Ustrcmp(argrest, "CT") == 0)
2184 {
2185 tls_offered = TRUE;
2186 break;
2187 }
2188 #endif
2189
2190 /* -M[x]: various operations on the following list of message ids:
2191 -M deliver the messages, ignoring next retry times and thawing
2192 -Mc deliver the messages, checking next retry times, no thawing
2193 -Mf freeze the messages
2194 -Mg give up on the messages
2195 -Mt thaw the messages
2196 -Mrm remove the messages
2197 In the above cases, this must be the last option. There are also the
2198 following options which are followed by a single message id, and which
2199 act on that message. Some of them use the "recipient" addresses as well.
2200 -Mar add recipient(s)
2201 -Mmad mark all recipients delivered
2202 -Mmd mark recipients(s) delivered
2203 -Mes edit sender
2204 -Mset load a message for use with -be
2205 -Mvb show body
2206 -Mvc show copy (of whole message, in RFC 2822 format)
2207 -Mvh show header
2208 -Mvl show log
2209 */
2210
2211 else if (*argrest == 0)
2212 {
2213 msg_action = MSG_DELIVER;
2214 forced_delivery = deliver_force_thaw = TRUE;
2215 }
2216 else if (Ustrcmp(argrest, "ar") == 0)
2217 {
2218 msg_action = MSG_ADD_RECIPIENT;
2219 one_msg_action = TRUE;
2220 }
2221 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2222 else if (Ustrcmp(argrest, "es") == 0)
2223 {
2224 msg_action = MSG_EDIT_SENDER;
2225 one_msg_action = TRUE;
2226 }
2227 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2228 else if (Ustrcmp(argrest, "g") == 0)
2229 {
2230 msg_action = MSG_DELIVER;
2231 deliver_give_up = TRUE;
2232 }
2233 else if (Ustrcmp(argrest, "mad") == 0)
2234 {
2235 msg_action = MSG_MARK_ALL_DELIVERED;
2236 }
2237 else if (Ustrcmp(argrest, "md") == 0)
2238 {
2239 msg_action = MSG_MARK_DELIVERED;
2240 one_msg_action = TRUE;
2241 }
2242 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2243 else if (Ustrcmp(argrest, "set") == 0)
2244 {
2245 msg_action = MSG_LOAD;
2246 one_msg_action = TRUE;
2247 }
2248 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2249 else if (Ustrcmp(argrest, "vb") == 0)
2250 {
2251 msg_action = MSG_SHOW_BODY;
2252 one_msg_action = TRUE;
2253 }
2254 else if (Ustrcmp(argrest, "vc") == 0)
2255 {
2256 msg_action = MSG_SHOW_COPY;
2257 one_msg_action = TRUE;
2258 }
2259 else if (Ustrcmp(argrest, "vh") == 0)
2260 {
2261 msg_action = MSG_SHOW_HEADER;
2262 one_msg_action = TRUE;
2263 }
2264 else if (Ustrcmp(argrest, "vl") == 0)
2265 {
2266 msg_action = MSG_SHOW_LOG;
2267 one_msg_action = TRUE;
2268 }
2269 else { badarg = TRUE; break; }
2270
2271 /* All the -Mxx options require at least one message id. */
2272
2273 msg_action_arg = i + 1;
2274 if (msg_action_arg >= argc)
2275 {
2276 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2277 return EXIT_FAILURE;
2278 }
2279
2280 /* Some require only message ids to follow */
2281
2282 if (!one_msg_action)
2283 {
2284 int j;
2285 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2286 {
2287 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2288 argv[j], arg);
2289 return EXIT_FAILURE;
2290 }
2291 goto END_ARG; /* Remaining args are ids */
2292 }
2293
2294 /* Others require only one message id, possibly followed by addresses,
2295 which will be handled as normal arguments. */
2296
2297 else
2298 {
2299 if (!mac_ismsgid(argv[msg_action_arg]))
2300 {
2301 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2302 argv[msg_action_arg], arg);
2303 return EXIT_FAILURE;
2304 }
2305 i++;
2306 }
2307 break;
2308
2309
2310 /* Some programs seem to call the -om option without the leading o;
2311 for sendmail it askes for "me too". Exim always does this. */
2312
2313 case 'm':
2314 if (*argrest != 0) badarg = TRUE;
2315 break;
2316
2317
2318 /* -N: don't do delivery - a debugging option that stops transports doing
2319 their thing. It implies debugging at the D_v level. */
2320
2321 case 'N':
2322 if (*argrest == 0)
2323 {
2324 dont_deliver = TRUE;
2325 debug_selector |= D_v;
2326 debug_file = stderr;
2327 }
2328 else badarg = TRUE;
2329 break;
2330
2331
2332 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2333 it. */
2334
2335 case 'n':
2336 break;
2337
2338 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2339 option to the specified value. This form uses long names. We need to handle
2340 -O option=value and -Ooption=value. */
2341
2342 case 'O':
2343 if (*argrest == 0)
2344 {
2345 if (++i >= argc)
2346 {
2347 fprintf(stderr, "exim: string expected after -O\n");
2348 exit(EXIT_FAILURE);
2349 }
2350 }
2351 break;
2352
2353 case 'o':
2354
2355 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2356 file" option). */
2357
2358 if (*argrest == 'A')
2359 {
2360 alias_arg = argrest + 1;
2361 if (alias_arg[0] == 0)
2362 {
2363 if (i+1 < argc) alias_arg = argv[++i]; else
2364 {
2365 fprintf(stderr, "exim: string expected after -oA\n");
2366 exit(EXIT_FAILURE);
2367 }
2368 }
2369 }
2370
2371 /* -oB: Set a connection message max value for remote deliveries */
2372
2373 else if (*argrest == 'B')
2374 {
2375 uschar *p = argrest + 1;
2376 if (p[0] == 0)
2377 {
2378 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2379 {
2380 connection_max_messages = 1;
2381 p = NULL;
2382 }
2383 }
2384
2385 if (p != NULL)
2386 {
2387 if (!isdigit(*p))
2388 {
2389 fprintf(stderr, "exim: number expected after -oB\n");
2390 exit(EXIT_FAILURE);
2391 }
2392 connection_max_messages = Uatoi(p);
2393 }
2394 }
2395
2396 /* -odb: background delivery */
2397
2398 else if (Ustrcmp(argrest, "db") == 0)
2399 {
2400 synchronous_delivery = FALSE;
2401 arg_queue_only = FALSE;
2402 queue_only_set = TRUE;
2403 }
2404
2405 /* -odf: foreground delivery (smail-compatible option); same effect as
2406 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2407 */
2408
2409 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2410 {
2411 synchronous_delivery = TRUE;
2412 arg_queue_only = FALSE;
2413 queue_only_set = TRUE;
2414 }
2415
2416 /* -odq: queue only */
2417
2418 else if (Ustrcmp(argrest, "dq") == 0)
2419 {
2420 synchronous_delivery = FALSE;
2421 arg_queue_only = TRUE;
2422 queue_only_set = TRUE;
2423 }
2424
2425 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2426 but no remote delivery */
2427
2428 else if (Ustrcmp(argrest, "dqs") == 0)
2429 {
2430 queue_smtp = TRUE;
2431 arg_queue_only = FALSE;
2432 queue_only_set = TRUE;
2433 }
2434
2435 /* -oex: Sendmail error flags. As these are also accepted without the
2436 leading -o prefix, for compatibility with vacation and other callers,
2437 they are handled with -e above. */
2438
2439 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2440 -oitrue: Another sendmail syntax for the same */
2441
2442 else if (Ustrcmp(argrest, "i") == 0 ||
2443 Ustrcmp(argrest, "itrue") == 0)
2444 dot_ends = FALSE;
2445
2446 /* -oM*: Set various characteristics for an incoming message; actually
2447 acted on for trusted callers only. */
2448
2449 else if (*argrest == 'M')
2450 {
2451 if (i+1 >= argc)
2452 {
2453 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2454 exit(EXIT_FAILURE);
2455 }
2456
2457 /* -oMa: Set sender host address */
2458
2459 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2460
2461 /* -oMaa: Set authenticator name */
2462
2463 else if (Ustrcmp(argrest, "Maa") == 0)
2464 sender_host_authenticated = argv[++i];
2465
2466 /* -oMas: setting authenticated sender */
2467
2468 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2469
2470 /* -oMai: setting authenticated id */
2471
2472 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2473
2474 /* -oMi: Set incoming interface address */
2475
2476 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2477
2478 /* -oMr: Received protocol */
2479
2480 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2481
2482 /* -oMs: Set sender host name */
2483
2484 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2485
2486 /* -oMt: Set sender ident */
2487
2488 else if (Ustrcmp(argrest, "Mt") == 0)
2489 {
2490 sender_ident_set = TRUE;
2491 sender_ident = argv[++i];
2492 }
2493
2494 /* Else a bad argument */
2495
2496 else
2497 {
2498 badarg = TRUE;
2499 break;
2500 }
2501 }
2502
2503 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2504 seem to call this as -m (undocumented), so that is also accepted (see
2505 above). */
2506
2507 else if (Ustrcmp(argrest, "m") == 0) {}
2508
2509 /* -oo: An ancient flag for old-style addresses which still seems to
2510 crop up in some calls (see in SCO). */
2511
2512 else if (Ustrcmp(argrest, "o") == 0) {}
2513
2514 /* -oP <name>: set pid file path for daemon */
2515
2516 else if (Ustrcmp(argrest, "P") == 0)
2517 override_pid_file_path = argv[++i];
2518
2519 /* -or <n>: set timeout for non-SMTP acceptance
2520 -os <n>: set timeout for SMTP acceptance */
2521
2522 else if (*argrest == 'r' || *argrest == 's')
2523 {
2524 int *tp = (*argrest == 'r')?
2525 &arg_receive_timeout : &arg_smtp_receive_timeout;
2526 if (argrest[1] == 0)
2527 {
2528 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2529 }
2530 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2531 if (*tp < 0)
2532 {
2533 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2534 exit(EXIT_FAILURE);
2535 }
2536 }
2537
2538 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2539
2540 else if (Ustrcmp(argrest, "X") == 0)
2541 override_local_interfaces = argv[++i];
2542
2543 /* Unknown -o argument */
2544
2545 else badarg = TRUE;
2546 break;
2547
2548
2549 /* -ps: force Perl startup; -pd force delayed Perl startup */
2550
2551 case 'p':
2552 #ifdef EXIM_PERL
2553 if (*argrest == 's' && argrest[1] == 0)
2554 {
2555 perl_start_option = 1;
2556 break;
2557 }
2558 if (*argrest == 'd' && argrest[1] == 0)
2559 {
2560 perl_start_option = -1;
2561 break;
2562 }
2563 #endif
2564
2565 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2566 which sets the host protocol and host name */
2567
2568 if (*argrest == 0)
2569 {
2570 if (i+1 < argc) argrest = argv[++i]; else
2571 { badarg = TRUE; break; }
2572 }
2573
2574 if (*argrest != 0)
2575 {
2576 uschar *hn = Ustrchr(argrest, ':');
2577 if (hn == NULL)
2578 {
2579 received_protocol = argrest;
2580 }
2581 else
2582 {
2583 received_protocol = string_copyn(argrest, hn - argrest);
2584 sender_host_name = hn + 1;
2585 }
2586 }
2587 break;
2588
2589
2590 case 'q':
2591 receiving_message = FALSE;
2592 if (queue_interval >= 0)
2593 {
2594 fprintf(stderr, "exim: -q specified more than once\n");
2595 exit(EXIT_FAILURE);
2596 }
2597
2598 /* -qq...: Do queue runs in a 2-stage manner */
2599
2600 if (*argrest == 'q')
2601 {
2602 queue_2stage = TRUE;
2603 argrest++;
2604 }
2605
2606 /* -qi...: Do only first (initial) deliveries */
2607
2608 if (*argrest == 'i')
2609 {
2610 queue_run_first_delivery = TRUE;
2611 argrest++;
2612 }
2613
2614 /* -qf...: Run the queue, forcing deliveries
2615 -qff..: Ditto, forcing thawing as well */
2616
2617 if (*argrest == 'f')
2618 {
2619 queue_run_force = TRUE;
2620 if (*(++argrest) == 'f')
2621 {
2622 deliver_force_thaw = TRUE;
2623 argrest++;
2624 }
2625 }
2626
2627 /* -q[f][f]l...: Run the queue only on local deliveries */
2628
2629 if (*argrest == 'l')
2630 {
2631 queue_run_local = TRUE;
2632 argrest++;
2633 }
2634
2635 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2636 optionally starting from a given message id. */
2637
2638 if (*argrest == 0 &&
2639 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2640 {
2641 queue_interval = 0;
2642 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2643 start_queue_run_id = argv[++i];
2644 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2645 stop_queue_run_id = argv[++i];
2646 }
2647
2648 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2649 optionally local only. */
2650
2651 else
2652 {
2653 if (*argrest != 0)
2654 queue_interval = readconf_readtime(argrest, 0, FALSE);
2655 else
2656 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2657 if (queue_interval <= 0)
2658 {
2659 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2660 exit(EXIT_FAILURE);
2661 }
2662 }
2663 break;
2664
2665
2666 case 'R': /* Synonymous with -qR... */
2667 receiving_message = FALSE;
2668
2669 /* -Rf: As -R (below) but force all deliveries,
2670 -Rff: Ditto, but also thaw all frozen messages,
2671 -Rr: String is regex
2672 -Rrf: Regex and force
2673 -Rrff: Regex and force and thaw
2674
2675 in all cases provided there are no further characters in this
2676 argument. */
2677
2678 if (*argrest != 0)
2679 {
2680 int i;
2681 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2682 {
2683 if (Ustrcmp(argrest, rsopts[i]) == 0)
2684 {
2685 if (i != 2) queue_run_force = TRUE;
2686 if (i >= 2) deliver_selectstring_regex = TRUE;
2687 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2688 argrest += Ustrlen(rsopts[i]);
2689 }
2690 }
2691 }
2692
2693 /* -R: Set string to match in addresses for forced queue run to
2694 pick out particular messages. */
2695
2696 if (*argrest == 0)
2697 {
2698 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2699 {
2700 fprintf(stderr, "exim: string expected after -R\n");
2701 exit(EXIT_FAILURE);
2702 }
2703 }
2704 else deliver_selectstring = argrest;
2705 break;
2706
2707
2708 /* -r: an obsolete synonym for -f (see above) */
2709
2710
2711 /* -S: Like -R but works on sender. */
2712
2713 case 'S': /* Synonymous with -qS... */
2714 receiving_message = FALSE;
2715
2716 /* -Sf: As -S (below) but force all deliveries,
2717 -Sff: Ditto, but also thaw all frozen messages,
2718 -Sr: String is regex
2719 -Srf: Regex and force
2720 -Srff: Regex and force and thaw
2721
2722 in all cases provided there are no further characters in this
2723 argument. */
2724
2725 if (*argrest != 0)
2726 {
2727 int i;
2728 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2729 {
2730 if (Ustrcmp(argrest, rsopts[i]) == 0)
2731 {
2732 if (i != 2) queue_run_force = TRUE;
2733 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2734 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2735 argrest += Ustrlen(rsopts[i]);
2736 }
2737 }
2738 }
2739
2740 /* -S: Set string to match in addresses for forced queue run to
2741 pick out particular messages. */
2742
2743 if (*argrest == 0)
2744 {
2745 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2746 {
2747 fprintf(stderr, "exim: string expected after -S\n");
2748 exit(EXIT_FAILURE);
2749 }
2750 }
2751 else deliver_selectstring_sender = argrest;
2752 break;
2753
2754 /* -Tqt is an option that is exclusively for use by the testing suite.
2755 It is not recognized in other circumstances. It allows for the setting up
2756 of explicit "queue times" so that various warning/retry things can be
2757 tested. Otherwise variability of clock ticks etc. cause problems. */
2758
2759 case 'T':
2760 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2761 fudged_queue_times = argv[++i];
2762 else badarg = TRUE;
2763 break;
2764
2765
2766 /* -t: Set flag to extract recipients from body of message. */
2767
2768 case 't':
2769 if (*argrest == 0) extract_recipients = TRUE;
2770
2771 /* -ti: Set flag to extract recipients from body of message, and also
2772 specify that dot does not end the message. */
2773
2774 else if (Ustrcmp(argrest, "i") == 0)
2775 {
2776 extract_recipients = TRUE;
2777 dot_ends = FALSE;
2778 }
2779
2780 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2781
2782 #ifdef SUPPORT_TLS
2783 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2784 #endif
2785
2786 else badarg = TRUE;
2787 break;
2788
2789
2790 /* -U: This means "initial user submission" in sendmail, apparently. The
2791 doc claims that in future sendmail may refuse syntactically invalid
2792 messages instead of fixing them. For the moment, we just ignore it. */
2793
2794 case 'U':
2795 break;
2796
2797
2798 /* -v: verify things - this is a very low-level debugging */
2799
2800 case 'v':
2801 if (*argrest == 0)
2802 {
2803 debug_selector |= D_v;
2804 debug_file = stderr;
2805 }
2806 else badarg = TRUE;
2807 break;
2808
2809
2810 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2811
2812 The -x flag tells the sendmail command that mail from a local
2813 mail program has National Language Support (NLS) extended characters
2814 in the body of the mail item. The sendmail command can send mail with
2815 extended NLS characters across networks that normally corrupts these
2816 8-bit characters.
2817
2818 As Exim is 8-bit clean, it just ignores this flag. */
2819
2820 case 'x':
2821 if (*argrest != 0) badarg = TRUE;
2822 break;
2823
2824 /* All other initial characters are errors */
2825
2826 default:
2827 badarg = TRUE;
2828 break;
2829 } /* End of high-level switch statement */
2830
2831 /* Failed to recognize the option, or syntax error */
2832
2833 if (badarg)
2834 {
2835 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2836 "option %s\n", arg);
2837 exit(EXIT_FAILURE);
2838 }
2839 }
2840
2841
2842 /* If -R or -S have been specified without -q, assume a single queue run. */
2843
2844 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2845 queue_interval < 0) queue_interval = 0;
2846
2847
2848 END_ARG:
2849 /* If usage_wanted is set we call the usage function - which never returns */
2850 if (usage_wanted) exim_usage(called_as);
2851
2852 /* Arguments have been processed. Check for incompatibilities. */
2853 if ((
2854 (smtp_input || extract_recipients || recipients_arg < argc) &&
2855 (daemon_listen || queue_interval >= 0 || bi_option ||
2856 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2857 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2858 ) ||
2859 (
2860 msg_action_arg > 0 &&
2861 (daemon_listen || queue_interval >= 0 || list_options ||
2862 (checking && msg_action != MSG_LOAD) ||
2863 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2864 ) ||
2865 (
2866 (daemon_listen || queue_interval >= 0) &&
2867 (sender_address != NULL || list_options || list_queue || checking ||
2868 bi_option)
2869 ) ||
2870 (
2871 daemon_listen && queue_interval == 0
2872 ) ||
2873 (
2874 list_options &&
2875 (checking || smtp_input || extract_recipients ||
2876 filter_test != FTEST_NONE || bi_option)
2877 ) ||
2878 (
2879 verify_address_mode &&
2880 (address_test_mode || smtp_input || extract_recipients ||
2881 filter_test != FTEST_NONE || bi_option)
2882 ) ||
2883 (
2884 address_test_mode && (smtp_input || extract_recipients ||
2885 filter_test != FTEST_NONE || bi_option)
2886 ) ||
2887 (
2888 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2889 extract_recipients)
2890 ) ||
2891 (
2892 deliver_selectstring != NULL && queue_interval < 0
2893 ) ||
2894 (
2895 msg_action == MSG_LOAD &&
2896 (!expansion_test || expansion_test_message != NULL)
2897 )
2898 )
2899 {
2900 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2901 exit(EXIT_FAILURE);
2902 }
2903
2904 /* If debugging is set up, set the file and the file descriptor to pass on to
2905 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2906 to run in the foreground. */
2907
2908 if (debug_selector != 0)
2909 {
2910 debug_file = stderr;
2911 debug_fd = fileno(debug_file);
2912 background_daemon = FALSE;
2913 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2914 if (debug_selector != D_v) /* -v only doesn't show this */
2915 {
2916 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2917 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2918 debug_selector);
2919 show_whats_supported(stderr);
2920 }
2921 }
2922
2923 /* When started with root privilege, ensure that the limits on the number of
2924 open files and the number of processes (where that is accessible) are
2925 sufficiently large, or are unset, in case Exim has been called from an
2926 environment where the limits are screwed down. Not all OS have the ability to
2927 change some of these limits. */
2928
2929 if (unprivileged)
2930 {
2931 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2932 }
2933 else
2934 {
2935 struct rlimit rlp;
2936
2937 #ifdef RLIMIT_NOFILE
2938 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2939 {
2940 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2941 strerror(errno));
2942 rlp.rlim_cur = rlp.rlim_max = 0;
2943 }
2944
2945 /* I originally chose 1000 as a nice big number that was unlikely to
2946 be exceeded. It turns out that some older OS have a fixed upper limit of
2947 256. */
2948
2949 if (rlp.rlim_cur < 1000)
2950 {
2951 rlp.rlim_cur = rlp.rlim_max = 1000;
2952 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2953 {
2954 rlp.rlim_cur = rlp.rlim_max = 256;
2955 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2956 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2957 strerror(errno));
2958 }
2959 }
2960 #endif
2961
2962 #ifdef RLIMIT_NPROC
2963 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2964 {
2965 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2966 strerror(errno));
2967 rlp.rlim_cur = rlp.rlim_max = 0;
2968 }
2969
2970 #ifdef RLIM_INFINITY
2971 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2972 {
2973 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2974 #else
2975 if (rlp.rlim_cur < 1000)
2976 {
2977 rlp.rlim_cur = rlp.rlim_max = 1000;
2978 #endif
2979 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2980 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2981 strerror(errno));
2982 }
2983 #endif
2984 }
2985
2986 /* Exim is normally entered as root (but some special configurations are
2987 possible that don't do this). However, it always spins off sub-processes that
2988 set their uid and gid as required for local delivery. We don't want to pass on
2989 any extra groups that root may belong to, so we want to get rid of them all at
2990 this point.
2991
2992 We need to obey setgroups() at this stage, before possibly giving up root
2993 privilege for a changed configuration file, but later on we might need to
2994 check on the additional groups for the admin user privilege - can't do that
2995 till after reading the config, which might specify the exim gid. Therefore,
2996 save the group list here first. */
2997
2998 group_count = getgroups(NGROUPS_MAX, group_list);
2999
3000 /* There is a fundamental difference in some BSD systems in the matter of
3001 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3002 known not to be different. On the "different" systems there is a single group
3003 list, and the first entry in it is the current group. On all other versions of
3004 Unix there is a supplementary group list, which is in *addition* to the current
3005 group. Consequently, to get rid of all extraneous groups on a "standard" system
3006 you pass over 0 groups to setgroups(), while on a "different" system you pass
3007 over a single group - the current group, which is always the first group in the
3008 list. Calling setgroups() with zero groups on a "different" system results in
3009 an error return. The following code should cope with both types of system.
3010
3011 However, if this process isn't running as root, setgroups() can't be used
3012 since you have to be root to run it, even if throwing away groups. Not being
3013 root here happens only in some unusual configurations. We just ignore the
3014 error. */
3015
3016 if (setgroups(0, NULL) != 0)
3017 {
3018 if (setgroups(1, group_list) != 0 && !unprivileged)
3019 {
3020 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3021 exit(EXIT_FAILURE);
3022 }
3023 }
3024
3025 /* If the configuration file name has been altered by an argument on the
3026 command line (either a new file name or a macro definition) and the caller is
3027 not root or the exim user, or if this is a filter testing run, remove any
3028 setuid privilege the program has, and run as the underlying user.
3029
3030 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3031 severely restricts the use of -C for some purposes.
3032
3033 Otherwise, set the real ids to the effective values (should be root unless run
3034 from inetd, which it can either be root or the exim uid, if one is configured).
3035
3036 There is a private mechanism for bypassing some of this, in order to make it
3037 possible to test lots of configurations automatically, without having either to
3038 recompile each time, or to patch in an actual configuration file name and other
3039 values (such as the path name). If running in the test harness, pretend that
3040 configuration file changes and macro definitions haven't happened. */
3041
3042 if (( /* EITHER */
3043 (config_changed || macros != NULL) && /* Config changed, and */
3044 real_uid != root_uid && /* Not root, and */
3045 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3046 real_uid != exim_uid && /* Not exim, and */
3047 #endif
3048 !running_in_test_harness /* Not fudged */
3049 ) || /* OR */
3050 expansion_test /* expansion testing */
3051 || /* OR */
3052 filter_test != FTEST_NONE) /* Filter testing */
3053 {
3054 setgroups(group_count, group_list);
3055 exim_setugid(real_uid, real_gid, FALSE,
3056 US"-C, -D, -be or -bf forces real uid");
3057 removed_privilege = TRUE;
3058
3059 /* In the normal case when Exim is called like this, stderr is available
3060 and should be used for any logging information because attempts to write
3061 to the log will usually fail. To arrange this, we unset really_exim. However,
3062 if no stderr is available there is no point - we might as well have a go
3063 at the log (if it fails, syslog will be written). */
3064
3065 if (log_stderr != NULL) really_exim = FALSE;
3066 }
3067
3068 /* Privilege is to be retained for the moment. It may be dropped later,
3069 depending on the job that this Exim process has been asked to do. For now, set
3070 the real uid to the effective so that subsequent re-execs of Exim are done by a
3071 privileged user. */
3072
3073 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3074
3075 /* If testing a filter, open the file(s) now, before wasting time doing other
3076 setups and reading the message. */
3077
3078 if ((filter_test & FTEST_SYSTEM) != 0)
3079 {
3080 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3081 if (filter_sfd < 0)
3082 {
3083 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3084 strerror(errno));
3085 return EXIT_FAILURE;
3086 }
3087 }
3088
3089 if ((filter_test & FTEST_USER) != 0)
3090 {
3091 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3092 if (filter_ufd < 0)
3093 {
3094 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3095 strerror(errno));
3096 return EXIT_FAILURE;
3097 }
3098 }
3099
3100 /* Read the main runtime configuration data; this gives up if there
3101 is a failure. It leaves the configuration file open so that the subsequent
3102 configuration data for delivery can be read if needed. */
3103
3104 readconf_main();
3105
3106 /* Handle the decoding of logging options. */
3107
3108 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3109 log_selector_string, log_options, log_options_count, US"log", 0);
3110
3111 DEBUG(D_any)
3112 {
3113 debug_printf("configuration file is %s\n", config_main_filename);
3114 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3115 log_extra_selector);
3116 }
3117
3118 /* If domain literals are not allowed, check the sender address that was
3119 supplied with -f. Ditto for a stripped trailing dot. */
3120
3121 if (sender_address != NULL)
3122 {
3123 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3124 {
3125 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3126 "allowed\n", sender_address);
3127 return EXIT_FAILURE;
3128 }
3129 if (f_end_dot && !strip_trailing_dot)
3130 {
3131 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3132 "(trailing dot not allowed)\n", sender_address);
3133 return EXIT_FAILURE;
3134 }
3135 }
3136
3137 /* Paranoia check of maximum lengths of certain strings. There is a check
3138 on the length of the log file path in log.c, which will come into effect
3139 if there are any calls to write the log earlier than this. However, if we
3140 get this far but the string is very long, it is better to stop now than to
3141 carry on and (e.g.) receive a message and then have to collapse. The call to
3142 log_write() from here will cause the ultimate panic collapse if the complete
3143 file name exceeds the buffer length. */
3144
3145 if (Ustrlen(log_file_path) > 200)
3146 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3147 "log_file_path is longer than 200 chars: aborting");
3148
3149 if (Ustrlen(pid_file_path) > 200)
3150 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3151 "pid_file_path is longer than 200 chars: aborting");
3152
3153 if (Ustrlen(spool_directory) > 200)
3154 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3155 "spool_directory is longer than 200 chars: aborting");
3156
3157 /* Length check on the process name given to syslog for its TAG field,
3158 which is only permitted to be 32 characters or less. See RFC 3164. */
3159
3160 if (Ustrlen(syslog_processname) > 32)
3161 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3162 "syslog_processname is longer than 32 chars: aborting");
3163
3164 /* In some operating systems, the environment variable TMPDIR controls where
3165 temporary files are created; Exim doesn't use these (apart from when delivering
3166 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3167 If TMPDIR is found in the environment, reset it to the value defined in the
3168 TMPDIR macro, if this macro is defined. */
3169
3170 #ifdef TMPDIR
3171 {
3172 uschar **p;
3173 for (p = USS environ; *p != NULL; p++)
3174 {
3175 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3176 Ustrcmp(*p+7, TMPDIR) != 0)
3177 {
3178 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3179 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3180 *p = newp;
3181 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3182 }
3183 }
3184 }
3185 #endif
3186
3187 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3188 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3189 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3190 called by a user who has set the TZ variable. This then affects the timestamps
3191 in log files and in Received: headers, and any created Date: header lines. The
3192 required timezone is settable in the configuration file, so nothing can be done
3193 about this earlier - but hopefully nothing will normally be logged earlier than
3194 this. We have to make a new environment if TZ is wrong, but don't bother if
3195 timestamps_utc is set, because then all times are in UTC anyway. */
3196
3197 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3198 {
3199 timestamps_utc = TRUE;
3200 }
3201 else
3202 {
3203 uschar *envtz = US getenv("TZ");
3204 if ((envtz == NULL && timezone_string != NULL) ||
3205 (envtz != NULL &&
3206 (timezone_string == NULL ||
3207 Ustrcmp(timezone_string, envtz) != 0)))
3208 {
3209 uschar **p = USS environ;
3210 uschar **new;
3211 uschar **newp;
3212 int count = 0;
3213 while (*p++ != NULL) count++;
3214 if (envtz == NULL) count++;
3215 newp = new = malloc(sizeof(uschar *) * (count + 1));
3216 for (p = USS environ; *p != NULL; p++)
3217 {
3218 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3219 *newp++ = *p;
3220 }
3221 if (timezone_string != NULL)
3222 {
3223 *newp = malloc(Ustrlen(timezone_string) + 4);
3224 sprintf(CS *newp++, "TZ=%s", timezone_string);
3225 }
3226 *newp = NULL;
3227 environ = CSS new;
3228 tzset();
3229 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3230 tod_stamp(tod_log));
3231 }
3232 }
3233
3234 /* Handle the case when we have removed the setuid privilege because of -C or
3235 -D. This means that the caller of Exim was not root, and, provided that
3236 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3237 the binary.
3238
3239 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3240 were running as the exim user defined in the configuration file (different to
3241 the one in the binary). The sysadmin may expect this case to retain privilege
3242 because "the binary was called by the Exim user", but it hasn't, because of the
3243 order in which it handles this stuff. There are two possibilities:
3244
3245 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3246 to do message deliveries. Thus, the fact that it is running as a
3247 non-privileged user is plausible, and might be wanted in some special
3248 configurations. However, really_exim will have been set false when
3249 privilege was dropped, to stop Exim trying to write to its normal log
3250 files. Therefore, re-enable normal log processing, assuming the sysadmin
3251 has set up the log directory correctly.
3252
3253 (2) If deliver_drop_privilege is not set, the configuration won't work as
3254 apparently intended, and so we log a panic message. In order to retain
3255 root for -C or -D, the caller must either be root or the Exim user
3256 defined in the binary (when deliver_drop_ privilege is false).
3257
3258 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3259 built-in exim user or one defined in the configuration. In either event,
3260 re-enable log processing, assuming the sysadmin knows what they are doing. */
3261
3262 if (removed_privilege && (config_changed || macros != NULL) &&
3263 real_uid == exim_uid)
3264 {
3265 #ifdef ALT_CONFIG_ROOT_ONLY
3266 really_exim = TRUE; /* let logging work normally */
3267 #else
3268
3269 if (deliver_drop_privilege)
3270 really_exim = TRUE; /* let logging work normally */
3271 else
3272 log_write(0, LOG_MAIN|LOG_PANIC,
3273 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3274 (int)exim_uid, config_changed? "-C" : "-D");
3275 #endif
3276 }
3277
3278 /* Start up Perl interpreter if Perl support is configured and there is a
3279 perl_startup option, and the configuration or the command line specifies
3280 initializing starting. Note that the global variables are actually called
3281 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3282
3283 #ifdef EXIM_PERL
3284 if (perl_start_option != 0)
3285 opt_perl_at_start = (perl_start_option > 0);
3286 if (opt_perl_at_start && opt_perl_startup != NULL)
3287 {
3288 uschar *errstr;
3289 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3290 errstr = init_perl(opt_perl_startup);
3291 if (errstr != NULL)
3292 {
3293 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3294 return EXIT_FAILURE;
3295 }
3296 opt_perl_started = TRUE;
3297 }
3298 #endif /* EXIM_PERL */
3299
3300 /* Log the arguments of the call if the configuration file said so. This is
3301 a debugging feature for finding out what arguments certain MUAs actually use.
3302 Don't attempt it if logging is disabled, or if listing variables or if
3303 verifying/testing addresses or expansions. */
3304
3305 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3306 && really_exim && !list_options && !checking)
3307 {
3308 int i;
3309 uschar *p = big_buffer;
3310 Ustrcpy(p, "cwd=");
3311 (void)getcwd(CS p+4, big_buffer_size - 4);
3312 while (*p) p++;
3313 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3314 while (*p) p++;
3315 for (i = 0; i < argc; i++)
3316 {
3317 int len = Ustrlen(argv[i]);
3318 uschar *printing;
3319 uschar *quote;
3320 if (p + len + 8 >= big_buffer + big_buffer_size)
3321 {
3322 Ustrcpy(p, " ...");
3323 log_write(0, LOG_MAIN, "%s", big_buffer);
3324 Ustrcpy(big_buffer, "...");
3325 p = big_buffer + 3;
3326 }
3327 printing = string_printing(argv[i]);
3328 if (printing[0] == 0) quote = US"\""; else
3329 {
3330 uschar *pp = printing;
3331 quote = US"";
3332 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3333 }
3334 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3335 (p - big_buffer) - 4), printing, quote);
3336 while (*p) p++;
3337 }
3338
3339 if ((log_extra_selector & LX_arguments) != 0)
3340 log_write(0, LOG_MAIN, "%s", big_buffer);
3341 else
3342 debug_printf("%s\n", big_buffer);
3343 }
3344
3345 /* Set the working directory to be the top-level spool directory. We don't rely
3346 on this in the code, which always uses fully qualified names, but it's useful
3347 for core dumps etc. Don't complain if it fails - the spool directory might not
3348 be generally accessible and calls with the -C option (and others) have lost
3349 privilege by now. Before the chdir, we try to ensure that the directory exists.
3350 */
3351
3352 if (Uchdir(spool_directory) != 0)
3353 {
3354 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3355 (void)Uchdir(spool_directory);
3356 }
3357
3358 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3359 alias file. Exim doesn't have such a concept, but this call is screwed into
3360 Sun's YP makefiles. Handle this by calling a configured script, as the real
3361 user who called Exim. The -oA option can be used to pass an argument to the
3362 script. */
3363
3364 if (bi_option)
3365 {
3366 (void)fclose(config_file);
3367 if (bi_command != NULL)
3368 {
3369 int i = 0;
3370 uschar *argv[3];
3371 argv[i++] = bi_command;
3372 if (alias_arg != NULL) argv[i++] = alias_arg;
3373 argv[i++] = NULL;
3374
3375 setgroups(group_count, group_list);
3376 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3377
3378 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3379 (argv[1] == NULL)? US"" : argv[1]);
3380
3381 execv(CS argv[0], (char *const *)argv);
3382 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3383 exit(EXIT_FAILURE);
3384 }
3385 else
3386 {
3387 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3388 exit(EXIT_SUCCESS);
3389 }
3390 }
3391
3392 /* If an action on specific messages is requested, or if a daemon or queue
3393 runner is being started, we need to know if Exim was called by an admin user.
3394 This is the case if the real user is root or exim, or if the real group is
3395 exim, or if one of the supplementary groups is exim or a group listed in
3396 admin_groups. We don't fail all message actions immediately if not admin_user,
3397 since some actions can be performed by non-admin users. Instead, set admin_user
3398 for later interrogation. */
3399
3400 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3401 admin_user = TRUE;
3402 else
3403 {
3404 int i, j;
3405 for (i = 0; i < group_count; i++)
3406 {
3407 if (group_list[i] == exim_gid) admin_user = TRUE;
3408 else if (admin_groups != NULL)
3409 {
3410 for (j = 1; j <= (int)(admin_groups[0]); j++)
3411 if (admin_groups[j] == group_list[i])
3412 { admin_user = TRUE; break; }
3413 }
3414 if (admin_user) break;
3415 }
3416 }
3417
3418 /* Another group of privileged users are the trusted users. These are root,
3419 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3420 are permitted to specify sender_addresses with -f on the command line, and
3421 other message parameters as well. */
3422
3423 if (real_uid == root_uid || real_uid == exim_uid)
3424 trusted_caller = TRUE;
3425 else
3426 {
3427 int i, j;
3428
3429 if (trusted_users != NULL)
3430 {
3431 for (i = 1; i <= (int)(trusted_users[0]); i++)
3432 if (trusted_users[i] == real_uid)
3433 { trusted_caller = TRUE; break; }
3434 }
3435
3436 if (!trusted_caller && trusted_groups != NULL)
3437 {
3438 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3439 {
3440 if (trusted_groups[i] == real_gid)
3441 trusted_caller = TRUE;
3442 else for (j = 0; j < group_count; j++)
3443 {
3444 if (trusted_groups[i] == group_list[j])
3445 { trusted_caller = TRUE; break; }
3446 }
3447 if (trusted_caller) break;
3448 }
3449 }
3450 }
3451
3452 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3453 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3454
3455 /* Only an admin user may start the daemon or force a queue run in the default
3456 configuration, but the queue run restriction can be relaxed. Only an admin
3457 user may request that a message be returned to its sender forthwith. Only an
3458 admin user may specify a debug level greater than D_v (because it might show
3459 passwords, etc. in lookup queries). Only an admin user may request a queue
3460 count. Only an admin user can use the test interface to scan for email
3461 (because Exim will be in the spool dir and able to look at mails). */
3462
3463 if (!admin_user)
3464 {
3465 BOOL debugset = (debug_selector & ~D_v) != 0;
3466 if (deliver_give_up || daemon_listen || malware_test_file ||
3467 (count_queue && queue_list_requires_admin) ||
3468 (list_queue && queue_list_requires_admin) ||
3469 (queue_interval >= 0 && prod_requires_admin) ||
3470 (debugset && !running_in_test_harness))
3471 {
3472 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3473 exit(EXIT_FAILURE);
3474 }
3475 }
3476
3477 /* If the real user is not root or the exim uid, the argument for passing
3478 in an open TCP/IP connection for another message is not permitted, nor is
3479 running with the -N option for any delivery action, unless this call to exim is
3480 one that supplied an input message, or we are using a patched exim for
3481 regression testing. */
3482
3483 if (real_uid != root_uid && real_uid != exim_uid &&
3484 (continue_hostname != NULL ||
3485 (dont_deliver &&
3486 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3487 )) && !running_in_test_harness)
3488 {
3489 fprintf(stderr, "exim: Permission denied\n");
3490 return EXIT_FAILURE;
3491 }
3492
3493 /* If the caller is not trusted, certain arguments are ignored when running for
3494 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3495 Note that authority for performing certain actions on messages is tested in the
3496 queue_action() function. */
3497
3498 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3499 {
3500 sender_host_name = sender_host_address = interface_address =
3501 sender_ident = received_protocol = NULL;
3502 sender_host_port = interface_port = 0;
3503 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3504 }
3505
3506 /* If a sender host address is set, extract the optional port number off the
3507 end of it and check its syntax. Do the same thing for the interface address.
3508 Exim exits if the syntax is bad. */
3509
3510 else
3511 {
3512 if (sender_host_address != NULL)
3513 sender_host_port = check_port(sender_host_address);
3514 if (interface_address != NULL)
3515 interface_port = check_port(interface_address);
3516 }
3517
3518 /* If an SMTP message is being received check to see if the standard input is a
3519 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3520 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3521 barf. */
3522
3523 if (smtp_input)
3524 {
3525 union sockaddr_46 inetd_sock;
3526 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3527 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3528 {
3529 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3530 if (family == AF_INET || family == AF_INET6)
3531 {
3532 union sockaddr_46 interface_sock;
3533 size = sizeof(interface_sock);
3534
3535 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3536 interface_address = host_ntoa(-1, &interface_sock, NULL,
3537 &interface_port);
3538
3539 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3540
3541 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3542 {
3543 is_inetd = TRUE;
3544 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3545 NULL, &sender_host_port);
3546 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3547 "inetd is not supported when mua_wrapper is set");
3548 }
3549 else
3550 {
3551 fprintf(stderr,
3552 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3553 return EXIT_FAILURE;
3554 }
3555 }
3556 }
3557 }
3558
3559 /* If the load average is going to be needed while receiving a message, get it
3560 now for those OS that require the first call to os_getloadavg() to be done as
3561 root. There will be further calls later for each message received. */
3562
3563 #ifdef LOAD_AVG_NEEDS_ROOT
3564 if (receiving_message &&
3565 (queue_only_load >= 0 ||
3566 (is_inetd && smtp_load_reserve >= 0)
3567 ))
3568 {
3569 load_average = OS_GETLOADAVG();
3570 }
3571 #endif
3572
3573 /* The queue_only configuration option can be overridden by -odx on the command
3574 line, except that if queue_only_override is false, queue_only cannot be unset
3575 from the command line. */
3576
3577 if (queue_only_set && (queue_only_override || arg_queue_only))
3578 queue_only = arg_queue_only;
3579
3580 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3581 -or and -os. */
3582
3583 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3584 if (arg_smtp_receive_timeout >= 0)
3585 smtp_receive_timeout = arg_smtp_receive_timeout;
3586
3587 /* If Exim was started with root privilege, unless we have already removed the
3588 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3589 except when starting the daemon or doing some kind of delivery or address
3590 testing (-bt). These are the only cases when root need to be retained. We run
3591 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3592 retained only for starting the daemon. We always do the initgroups() in this
3593 situation (controlled by the TRUE below), in order to be as close as possible
3594 to the state Exim usually runs in. */
3595
3596 if (!unprivileged && /* originally had root AND */
3597 !removed_privilege && /* still got root AND */
3598 !daemon_listen && /* not starting the daemon */
3599 queue_interval <= 0 && /* (either kind of daemon) */
3600 ( /* AND EITHER */
3601 deliver_drop_privilege || /* requested unprivileged */
3602 ( /* OR */
3603 queue_interval < 0 && /* not running the queue */
3604 (msg_action_arg < 0 || /* and */
3605 msg_action != MSG_DELIVER) && /* not delivering and */
3606 (!checking || !address_test_mode) /* not address checking */
3607 )
3608 ))
3609 {
3610 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3611 }
3612
3613 /* When we are retaining a privileged uid, we still change to the exim gid. */
3614
3615 else setgid(exim_gid);
3616
3617 /* Handle a request to scan a file for malware */
3618 if (malware_test_file)
3619 {
3620 int result;
3621 set_process_info("scanning file for malware");
3622 result = malware_in_file(malware_test_file);
3623 if (result == FAIL)
3624 {
3625 printf("No malware found.\n");
3626 exit(EXIT_SUCCESS);
3627 }
3628 if (result != OK)
3629 {
3630 printf("Malware lookup returned non-okay/fail: %d\n", result);
3631 exit(EXIT_FAILURE);
3632 }
3633 if (malware_name)
3634 printf("Malware found: %s\n", malware_name);
3635 else
3636 printf("Malware scan detected malware of unknown name.\n");
3637 exit(EXIT_FAILURE);
3638 }
3639
3640 /* Handle a request to list the delivery queue */
3641
3642 if (list_queue)
3643 {
3644 set_process_info("listing the queue");
3645 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3646 exit(EXIT_SUCCESS);
3647 }
3648
3649 /* Handle a request to count the delivery queue */
3650
3651 if (count_queue)
3652 {
3653 set_process_info("counting the queue");
3654 queue_count();
3655 exit(EXIT_SUCCESS);
3656 }
3657
3658 /* Handle actions on specific messages, except for the force delivery and
3659 message load actions, which are done below. Some actions take a whole list of
3660 message ids, which are known to continue up to the end of the arguments. Others
3661 take a single message id and then operate on the recipients list. */
3662
3663 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3664 {
3665 int yield = EXIT_SUCCESS;
3666 set_process_info("acting on specified messages");
3667
3668 if (!one_msg_action)
3669 {
3670 for (i = msg_action_arg; i < argc; i++)
3671 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3672 yield = EXIT_FAILURE;
3673 }
3674
3675 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3676 recipients_arg)) yield = EXIT_FAILURE;
3677 exit(yield);
3678 }
3679
3680 /* All the modes below here require the remaining configuration sections
3681 to be read, except that we can skip over the ACL setting when delivering
3682 specific messages, or doing a queue run. (For various testing cases we could
3683 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3684 for skipping. */
3685
3686 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3687
3688 /* The configuration data will have been read into POOL_PERM because we won't
3689 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3690 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3691 configuration were read into POOL_MAIN, because we don't do any resets till
3692 later on. However, it seems right, and it does ensure that both pools get used.
3693 */
3694
3695 store_pool = POOL_MAIN;
3696
3697 /* Handle the -brt option. This is for checking out retry configurations.
3698 The next three arguments are a domain name or a complete address, and
3699 optionally two error numbers. All it does is to call the function that
3700 scans the retry configuration data. */
3701
3702 if (test_retry_arg >= 0)
3703 {
3704 retry_config *yield;
3705 int basic_errno = 0;
3706 int more_errno = 0;
3707 uschar *s1, *s2;
3708
3709 if (test_retry_arg >= argc)
3710 {
3711 printf("-brt needs a domain or address argument\n");
3712 exim_exit(EXIT_FAILURE);
3713 }
3714 s1 = argv[test_retry_arg++];
3715 s2 = NULL;
3716
3717 /* If the first argument contains no @ and no . it might be a local user
3718 or it might be a single-component name. Treat as a domain. */
3719
3720 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3721 {
3722 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3723 "being \ntreated as a one-component domain, not as a local part.\n\n",
3724 s1);
3725 }
3726
3727 /* There may be an optional second domain arg. */
3728
3729 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3730 s2 = argv[test_retry_arg++];
3731
3732 /* The final arg is an error name */
3733
3734 if (test_retry_arg < argc)
3735 {
3736 uschar *ss = argv[test_retry_arg];
3737 uschar *error =
3738 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3739 if (error != NULL)
3740 {
3741 printf("%s\n", CS error);
3742 return EXIT_FAILURE;
3743 }
3744
3745 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3746 code > 100 as an error is for matching codes to the decade. Turn them into
3747 a real error code, off the decade. */
3748
3749 if (basic_errno == ERRNO_MAIL4XX ||
3750 basic_errno == ERRNO_RCPT4XX ||
3751 basic_errno == ERRNO_DATA4XX)
3752 {
3753 int code = (more_errno >> 8) & 255;
3754 if (code == 255)
3755 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3756 else if (code > 100)
3757 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3758 }
3759 }
3760
3761 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3762 if (yield == NULL) printf("No retry information found\n"); else
3763 {
3764 retry_rule *r;
3765 more_errno = yield->more_errno;
3766 printf("Retry rule: %s ", yield->pattern);
3767
3768 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3769 {
3770 printf("quota%s%s ",
3771 (more_errno > 0)? "_" : "",
3772 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3773 }
3774 else if (yield->basic_errno == ECONNREFUSED)
3775 {
3776 printf("refused%s%s ",
3777 (more_errno > 0)? "_" : "",
3778 (more_errno == 'M')? "MX" :
3779 (more_errno == 'A')? "A" : "");
3780 }
3781 else if (yield->basic_errno == ETIMEDOUT)
3782 {
3783 printf("timeout");
3784 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3785 more_errno &= 255;
3786 if (more_errno != 0) printf("_%s",
3787 (more_errno == 'M')? "MX" : "A");
3788 printf(" ");
3789 }
3790 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3791 printf("auth_failed ");
3792 else printf("* ");
3793
3794 for (r = yield->rules; r != NULL; r = r->next)
3795 {
3796 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3797 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3798 if (r->rule == 'G')
3799 {
3800 int x = r->p2;
3801 int f = x % 1000;
3802 int d = 100;
3803 printf(",%d.", x/1000);
3804 do
3805 {
3806 printf("%d", f/d);
3807 f %= d;
3808 d /= 10;
3809 }
3810 while (f != 0);
3811 }
3812 printf("; ");
3813 }
3814
3815 printf("\n");
3816 }
3817 exim_exit(EXIT_SUCCESS);
3818 }
3819
3820 /* Handle a request to list one or more configuration options */
3821
3822 if (list_options)
3823 {
3824 set_process_info("listing variables");
3825 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3826 else for (i = recipients_arg; i < argc; i++)
3827 {
3828 if (i < argc - 1 &&
3829 (Ustrcmp(argv[i], "router") == 0 ||
3830 Ustrcmp(argv[i], "transport") == 0 ||
3831 Ustrcmp(argv[i], "authenticator") == 0 ||
3832 Ustrcmp(argv[i], "macro") == 0))
3833 {
3834 readconf_print(argv[i+1], argv[i]);
3835 i++;
3836 }
3837 else readconf_print(argv[i], NULL);
3838 }
3839 exim_exit(EXIT_SUCCESS);
3840 }
3841
3842
3843 /* Handle a request to deliver one or more messages that are already on the
3844 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3845 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3846
3847 Delivery of specific messages is typically used for a small number when
3848 prodding by hand (when the option forced_delivery will be set) or when
3849 re-execing to regain root privilege. Each message delivery must happen in a
3850 separate process, so we fork a process for each one, and run them sequentially
3851 so that debugging output doesn't get intertwined, and to avoid spawning too
3852 many processes if a long list is given. However, don't fork for the last one;
3853 this saves a process in the common case when Exim is called to deliver just one
3854 message. */
3855
3856 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3857 {
3858 if (prod_requires_admin && !admin_user)
3859 {
3860 fprintf(stderr, "exim: Permission denied\n");
3861 exim_exit(EXIT_FAILURE);
3862 }
3863 set_process_info("delivering specified messages");
3864 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3865 for (i = msg_action_arg; i < argc; i++)
3866 {
3867 int status;
3868 pid_t pid;
3869 if (i == argc - 1)
3870 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3871 else if ((pid = fork()) == 0)
3872 {
3873 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3874 _exit(EXIT_SUCCESS);
3875 }
3876 else if (pid < 0)
3877 {
3878 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3879 strerror(errno));
3880 exim_exit(EXIT_FAILURE);
3881 }
3882 else wait(&status);
3883 }
3884 exim_exit(EXIT_SUCCESS);
3885 }
3886
3887
3888 /* If only a single queue run is requested, without SMTP listening, we can just
3889 turn into a queue runner, with an optional starting message id. */
3890
3891 if (queue_interval == 0 && !daemon_listen)
3892 {
3893 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3894 (start_queue_run_id == NULL)? US"" : US" starting at ",
3895 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3896 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3897 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3898 set_process_info("running the queue (single queue run)");
3899 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3900 exim_exit(EXIT_SUCCESS);
3901 }
3902
3903
3904 /* Find the login name of the real user running this process. This is always
3905 needed when receiving a message, because it is written into the spool file. It
3906 may also be used to construct a from: or a sender: header, and in this case we
3907 need the user's full name as well, so save a copy of it, checked for RFC822
3908 syntax and munged if necessary, if it hasn't previously been set by the -F
3909 argument. We may try to get the passwd entry more than once, in case NIS or
3910 other delays are in evidence. Save the home directory for use in filter testing
3911 (only). */
3912
3913 for (i = 0;;)
3914 {
3915 if ((pw = getpwuid(real_uid)) != NULL)
3916 {
3917 originator_login = string_copy(US pw->pw_name);
3918 originator_home = string_copy(US pw->pw_dir);
3919
3920 /* If user name has not been set by -F, set it from the passwd entry
3921 unless -f has been used to set the sender address by a trusted user. */
3922
3923 if (originator_name == NULL)
3924 {
3925 if (sender_address == NULL ||
3926 (!trusted_caller && filter_test == FTEST_NONE))
3927 {
3928 uschar *name = US pw->pw_gecos;
3929 uschar *amp = Ustrchr(name, '&');
3930 uschar buffer[256];
3931
3932 /* Most Unix specify that a '&' character in the gecos field is
3933 replaced by a copy of the login name, and some even specify that
3934 the first character should be upper cased, so that's what we do. */
3935
3936 if (amp != NULL)
3937 {
3938 int loffset;
3939 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3940 amp - name, name, &loffset, originator_login, amp + 1);
3941 buffer[loffset] = toupper(buffer[loffset]);
3942 name = buffer;
3943 }
3944
3945 /* If a pattern for matching the gecos field was supplied, apply
3946 it and then expand the name string. */
3947
3948 if (gecos_pattern != NULL && gecos_name != NULL)
3949 {
3950 const pcre *re;
3951 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3952
3953 if (regex_match_and_setup(re, name, 0, -1))
3954 {
3955 uschar *new_name = expand_string(gecos_name);
3956 expand_nmax = -1;
3957 if (new_name != NULL)
3958 {
3959 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3960 "gecos field \"%s\"\n", new_name, name);
3961 name = new_name;
3962 }
3963 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3964 "\"%s\": %s\n", gecos_name, expand_string_message);
3965 }
3966 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3967 "gecos field \"%s\"\n", gecos_pattern, name);
3968 store_free((void *)re);
3969 }
3970 originator_name = string_copy(name);
3971 }
3972
3973 /* A trusted caller has used -f but not -F */
3974
3975 else originator_name = US"";
3976 }
3977
3978 /* Break the retry loop */
3979
3980 break;
3981 }
3982
3983 if (++i > finduser_retries) break;
3984 sleep(1);
3985 }
3986
3987 /* If we cannot get a user login, log the incident and give up, unless the
3988 configuration specifies something to use. When running in the test harness,
3989 any setting of unknown_login overrides the actual name. */
3990
3991 if (originator_login == NULL || running_in_test_harness)
3992 {
3993 if (unknown_login != NULL)
3994 {
3995 originator_login = expand_string(unknown_login);
3996 if (originator_name == NULL && unknown_username != NULL)
3997 originator_name = expand_string(unknown_username);
3998 if (originator_name == NULL) originator_name = US"";
3999 }
4000 if (originator_login == NULL)
4001 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4002 (int)real_uid);
4003 }
4004
4005 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4006 RFC822 address.*/
4007
4008 originator_name = string_copy(parse_fix_phrase(originator_name,
4009 Ustrlen(originator_name), big_buffer, big_buffer_size));
4010
4011 /* If a message is created by this call of Exim, the uid/gid of its originator
4012 are those of the caller. These values are overridden if an existing message is
4013 read in from the spool. */
4014
4015 originator_uid = real_uid;
4016 originator_gid = real_gid;
4017
4018 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4019 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4020
4021 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4022 returns. We leave this till here so that the originator_ fields are available
4023 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4024 mode. */
4025
4026 if (daemon_listen || queue_interval > 0)
4027 {
4028 if (mua_wrapper)
4029 {
4030 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4031 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4032 "mua_wrapper is set");
4033 }
4034 daemon_go();
4035 }
4036
4037 /* If the sender ident has not been set (by a trusted caller) set it to
4038 the caller. This will get overwritten below for an inetd call. If a trusted
4039 caller has set it empty, unset it. */
4040
4041 if (sender_ident == NULL) sender_ident = originator_login;
4042 else if (sender_ident[0] == 0) sender_ident = NULL;
4043
4044 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4045 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4046 originator_* variables set. */
4047
4048 if (test_rewrite_arg >= 0)
4049 {
4050 really_exim = FALSE;
4051 if (test_rewrite_arg >= argc)
4052 {
4053 printf("-brw needs an address argument\n");
4054 exim_exit(EXIT_FAILURE);
4055 }
4056 rewrite_test(argv[test_rewrite_arg]);
4057 exim_exit(EXIT_SUCCESS);
4058 }
4059
4060 /* A locally-supplied message is considered to be coming from a local user
4061 unless a trusted caller supplies a sender address with -f, or is passing in the
4062 message via SMTP (inetd invocation or otherwise). */
4063
4064 if ((sender_address == NULL && !smtp_input) ||
4065 (!trusted_caller && filter_test == FTEST_NONE))
4066 {
4067 sender_local = TRUE;
4068
4069 /* A trusted caller can supply authenticated_sender and authenticated_id
4070 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4071 defaults except when host checking. */
4072
4073 if (authenticated_sender == NULL && !host_checking)
4074 authenticated_sender = string_sprintf("%s@%s", originator_login,
4075 qualify_domain_sender);
4076 if (authenticated_id == NULL && !host_checking)
4077 authenticated_id = originator_login;
4078 }
4079
4080 /* Trusted callers are always permitted to specify the sender address.
4081 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4082 is specified is the empty address. However, if a trusted caller does not
4083 specify a sender address for SMTP input, we leave sender_address unset. This
4084 causes the MAIL commands to be honoured. */
4085
4086 if ((!smtp_input && sender_address == NULL) ||
4087 !receive_check_set_sender(sender_address))
4088 {
4089 /* Either the caller is not permitted to set a general sender, or this is
4090 non-SMTP input and the trusted caller has not set a sender. If there is no
4091 sender, or if a sender other than <> is set, override with the originator's
4092 login (which will get qualified below), except when checking things. */
4093
4094 if (sender_address == NULL /* No sender_address set */
4095 || /* OR */
4096 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4097 !checking && /* Not running tests, AND */
4098 filter_test == FTEST_NONE)) /* Not testing a filter */
4099 {
4100 sender_address = originator_login;
4101 sender_address_forced = FALSE;
4102 sender_address_domain = 0;