517b5435ebc675fb6ac6ef5a746a5870faea749b
[hcoop/debian/exim4.git] / src / exim.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2014 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
11
12
13 #include "exim.h"
14
15 extern void init_lookup_list(void);
16
17
18
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
22
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
30
31 static void *
32 function_store_get(size_t size)
33 {
34 return store_get((int)size);
35 }
36
37 static void
38 function_dummy_free(void *block) { block = block; }
39
40 static void *
41 function_store_malloc(size_t size)
42 {
43 return store_malloc((int)size);
44 }
45
46 static void
47 function_store_free(void *block)
48 {
49 store_free(block);
50 }
51
52
53
54
55 /*************************************************
56 * Enums for cmdline interface *
57 *************************************************/
58
59 enum commandline_info { CMDINFO_NONE=0,
60 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
61
62
63
64
65 /*************************************************
66 * Compile regular expression and panic on fail *
67 *************************************************/
68
69 /* This function is called when failure to compile a regular expression leads
70 to a panic exit. In other cases, pcre_compile() is called directly. In many
71 cases where this function is used, the results of the compilation are to be
72 placed in long-lived store, so we temporarily reset the store management
73 functions that PCRE uses if the use_malloc flag is set.
74
75 Argument:
76 pattern the pattern to compile
77 caseless TRUE if caseless matching is required
78 use_malloc TRUE if compile into malloc store
79
80 Returns: pointer to the compiled pattern
81 */
82
83 const pcre *
84 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
85 {
86 int offset;
87 int options = PCRE_COPT;
88 const pcre *yield;
89 const uschar *error;
90 if (use_malloc)
91 {
92 pcre_malloc = function_store_malloc;
93 pcre_free = function_store_free;
94 }
95 if (caseless) options |= PCRE_CASELESS;
96 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
97 pcre_malloc = function_store_get;
98 pcre_free = function_dummy_free;
99 if (yield == NULL)
100 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
101 "%s at offset %d while compiling %s", error, offset, pattern);
102 return yield;
103 }
104
105
106
107
108 /*************************************************
109 * Execute regular expression and set strings *
110 *************************************************/
111
112 /* This function runs a regular expression match, and sets up the pointers to
113 the matched substrings.
114
115 Arguments:
116 re the compiled expression
117 subject the subject string
118 options additional PCRE options
119 setup if < 0 do full setup
120 if >= 0 setup from setup+1 onwards,
121 excluding the full matched string
122
123 Returns: TRUE or FALSE
124 */
125
126 BOOL
127 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
128 {
129 int ovector[3*(EXPAND_MAXN+1)];
130 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
131 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
132 BOOL yield = n >= 0;
133 if (n == 0) n = EXPAND_MAXN + 1;
134 if (yield)
135 {
136 int nn;
137 expand_nmax = (setup < 0)? 0 : setup + 1;
138 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
139 {
140 expand_nstring[expand_nmax] = subject + ovector[nn];
141 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
142 }
143 expand_nmax--;
144 }
145 return yield;
146 }
147
148
149
150
151 /*************************************************
152 * Set up processing details *
153 *************************************************/
154
155 /* Save a text string for dumping when SIGUSR1 is received.
156 Do checks for overruns.
157
158 Arguments: format and arguments, as for printf()
159 Returns: nothing
160 */
161
162 void
163 set_process_info(const char *format, ...)
164 {
165 int len;
166 va_list ap;
167 sprintf(CS process_info, "%5d ", (int)getpid());
168 len = Ustrlen(process_info);
169 va_start(ap, format);
170 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len - 2, format, ap))
171 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
172 len = Ustrlen(process_info);
173 process_info[len+0] = '\n';
174 process_info[len+1] = '\0';
175 process_info_len = len + 1;
176 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
177 va_end(ap);
178 }
179
180
181
182
183 /*************************************************
184 * Handler for SIGUSR1 *
185 *************************************************/
186
187 /* SIGUSR1 causes any exim process to write to the process log details of
188 what it is currently doing. It will only be used if the OS is capable of
189 setting up a handler that causes automatic restarting of any system call
190 that is in progress at the time.
191
192 This function takes care to be signal-safe.
193
194 Argument: the signal number (SIGUSR1)
195 Returns: nothing
196 */
197
198 static void
199 usr1_handler(int sig)
200 {
201 int fd;
202
203 os_restarting_signal(sig, usr1_handler);
204
205 fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE);
206 if (fd < 0)
207 {
208 /* If we are already running as the Exim user, try to create it in the
209 current process (assuming spool_directory exists). Otherwise, if we are
210 root, do the creation in an exim:exim subprocess. */
211
212 int euid = geteuid();
213 if (euid == exim_uid)
214 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
215 else if (euid == root_uid)
216 fd = log_create_as_exim(process_log_path);
217 }
218
219 /* If we are neither exim nor root, or if we failed to create the log file,
220 give up. There is not much useful we can do with errors, since we don't want
221 to disrupt whatever is going on outside the signal handler. */
222
223 if (fd < 0) return;
224
225 {int dummy = write(fd, process_info, process_info_len); dummy = dummy; }
226 (void)close(fd);
227 }
228
229
230
231 /*************************************************
232 * Timeout handler *
233 *************************************************/
234
235 /* This handler is enabled most of the time that Exim is running. The handler
236 doesn't actually get used unless alarm() has been called to set a timer, to
237 place a time limit on a system call of some kind. When the handler is run, it
238 re-enables itself.
239
240 There are some other SIGALRM handlers that are used in special cases when more
241 than just a flag setting is required; for example, when reading a message's
242 input. These are normally set up in the code module that uses them, and the
243 SIGALRM handler is reset to this one afterwards.
244
245 Argument: the signal value (SIGALRM)
246 Returns: nothing
247 */
248
249 void
250 sigalrm_handler(int sig)
251 {
252 sig = sig; /* Keep picky compilers happy */
253 sigalrm_seen = TRUE;
254 os_non_restarting_signal(SIGALRM, sigalrm_handler);
255 }
256
257
258
259 /*************************************************
260 * Sleep for a fractional time interval *
261 *************************************************/
262
263 /* This function is called by millisleep() and exim_wait_tick() to wait for a
264 period of time that may include a fraction of a second. The coding is somewhat
265 tedious. We do not expect setitimer() ever to fail, but if it does, the process
266 will wait for ever, so we panic in this instance. (There was a case of this
267 when a bug in a function that calls milliwait() caused it to pass invalid data.
268 That's when I added the check. :-)
269
270 Argument: an itimerval structure containing the interval
271 Returns: nothing
272 */
273
274 static void
275 milliwait(struct itimerval *itval)
276 {
277 sigset_t sigmask;
278 sigset_t old_sigmask;
279 (void)sigemptyset(&sigmask); /* Empty mask */
280 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
281 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
282 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
283 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
284 "setitimer() failed: %s", strerror(errno));
285 (void)sigfillset(&sigmask); /* All signals */
286 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
287 (void)sigsuspend(&sigmask); /* Until SIGALRM */
288 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
289 }
290
291
292
293
294 /*************************************************
295 * Millisecond sleep function *
296 *************************************************/
297
298 /* The basic sleep() function has a granularity of 1 second, which is too rough
299 in some cases - for example, when using an increasing delay to slow down
300 spammers.
301
302 Argument: number of millseconds
303 Returns: nothing
304 */
305
306 void
307 millisleep(int msec)
308 {
309 struct itimerval itval;
310 itval.it_interval.tv_sec = 0;
311 itval.it_interval.tv_usec = 0;
312 itval.it_value.tv_sec = msec/1000;
313 itval.it_value.tv_usec = (msec % 1000) * 1000;
314 milliwait(&itval);
315 }
316
317
318
319 /*************************************************
320 * Compare microsecond times *
321 *************************************************/
322
323 /*
324 Arguments:
325 tv1 the first time
326 tv2 the second time
327
328 Returns: -1, 0, or +1
329 */
330
331 int
332 exim_tvcmp(struct timeval *t1, struct timeval *t2)
333 {
334 if (t1->tv_sec > t2->tv_sec) return +1;
335 if (t1->tv_sec < t2->tv_sec) return -1;
336 if (t1->tv_usec > t2->tv_usec) return +1;
337 if (t1->tv_usec < t2->tv_usec) return -1;
338 return 0;
339 }
340
341
342
343
344 /*************************************************
345 * Clock tick wait function *
346 *************************************************/
347
348 /* Exim uses a time + a pid to generate a unique identifier in two places: its
349 message IDs, and in file names for maildir deliveries. Because some OS now
350 re-use pids within the same second, sub-second times are now being used.
351 However, for absolute certaintly, we must ensure the clock has ticked before
352 allowing the relevant process to complete. At the time of implementation of
353 this code (February 2003), the speed of processors is such that the clock will
354 invariably have ticked already by the time a process has done its job. This
355 function prepares for the time when things are faster - and it also copes with
356 clocks that go backwards.
357
358 Arguments:
359 then_tv A timeval which was used to create uniqueness; its usec field
360 has been rounded down to the value of the resolution.
361 We want to be sure the current time is greater than this.
362 resolution The resolution that was used to divide the microseconds
363 (1 for maildir, larger for message ids)
364
365 Returns: nothing
366 */
367
368 void
369 exim_wait_tick(struct timeval *then_tv, int resolution)
370 {
371 struct timeval now_tv;
372 long int now_true_usec;
373
374 (void)gettimeofday(&now_tv, NULL);
375 now_true_usec = now_tv.tv_usec;
376 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
377
378 if (exim_tvcmp(&now_tv, then_tv) <= 0)
379 {
380 struct itimerval itval;
381 itval.it_interval.tv_sec = 0;
382 itval.it_interval.tv_usec = 0;
383 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
384 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
385
386 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
387 negative value for the microseconds is possible only in the case when "now"
388 is more than a second less than "then". That means that itval.it_value.tv_sec
389 is greater than zero. The following correction is therefore safe. */
390
391 if (itval.it_value.tv_usec < 0)
392 {
393 itval.it_value.tv_usec += 1000000;
394 itval.it_value.tv_sec -= 1;
395 }
396
397 DEBUG(D_transport|D_receive)
398 {
399 if (!running_in_test_harness)
400 {
401 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
402 then_tv->tv_sec, (long) then_tv->tv_usec,
403 now_tv.tv_sec, (long) now_tv.tv_usec);
404 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
405 (long) itval.it_value.tv_usec);
406 }
407 }
408
409 milliwait(&itval);
410 }
411 }
412
413
414
415
416 /*************************************************
417 * Call fopen() with umask 777 and adjust mode *
418 *************************************************/
419
420 /* Exim runs with umask(0) so that files created with open() have the mode that
421 is specified in the open() call. However, there are some files, typically in
422 the spool directory, that are created with fopen(). They end up world-writeable
423 if no precautions are taken. Although the spool directory is not accessible to
424 the world, this is an untidiness. So this is a wrapper function for fopen()
425 that sorts out the mode of the created file.
426
427 Arguments:
428 filename the file name
429 options the fopen() options
430 mode the required mode
431
432 Returns: the fopened FILE or NULL
433 */
434
435 FILE *
436 modefopen(const uschar *filename, const char *options, mode_t mode)
437 {
438 mode_t saved_umask = umask(0777);
439 FILE *f = Ufopen(filename, options);
440 (void)umask(saved_umask);
441 if (f != NULL) (void)fchmod(fileno(f), mode);
442 return f;
443 }
444
445
446
447
448 /*************************************************
449 * Ensure stdin, stdout, and stderr exist *
450 *************************************************/
451
452 /* Some operating systems grumble if an exec() happens without a standard
453 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
454 file will be opened and will use these fd values, and then some other bit of
455 code will assume, for example, that it can write error messages to stderr.
456 This function ensures that fds 0, 1, and 2 are open if they do not already
457 exist, by connecting them to /dev/null.
458
459 This function is also used to ensure that std{in,out,err} exist at all times,
460 so that if any library that Exim calls tries to use them, it doesn't crash.
461
462 Arguments: None
463 Returns: Nothing
464 */
465
466 void
467 exim_nullstd(void)
468 {
469 int i;
470 int devnull = -1;
471 struct stat statbuf;
472 for (i = 0; i <= 2; i++)
473 {
474 if (fstat(i, &statbuf) < 0 && errno == EBADF)
475 {
476 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
477 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
478 string_open_failed(errno, "/dev/null"));
479 if (devnull != i) (void)dup2(devnull, i);
480 }
481 }
482 if (devnull > 2) (void)close(devnull);
483 }
484
485
486
487
488 /*************************************************
489 * Close unwanted file descriptors for delivery *
490 *************************************************/
491
492 /* This function is called from a new process that has been forked to deliver
493 an incoming message, either directly, or using exec.
494
495 We want any smtp input streams to be closed in this new process. However, it
496 has been observed that using fclose() here causes trouble. When reading in -bS
497 input, duplicate copies of messages have been seen. The files will be sharing a
498 file pointer with the parent process, and it seems that fclose() (at least on
499 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
500 least sometimes. Hence we go for closing the underlying file descriptors.
501
502 If TLS is active, we want to shut down the TLS library, but without molesting
503 the parent's SSL connection.
504
505 For delivery of a non-SMTP message, we want to close stdin and stdout (and
506 stderr unless debugging) because the calling process might have set them up as
507 pipes and be waiting for them to close before it waits for the submission
508 process to terminate. If they aren't closed, they hold up the calling process
509 until the initial delivery process finishes, which is not what we want.
510
511 Exception: We do want it for synchronous delivery!
512
513 And notwithstanding all the above, if D_resolver is set, implying resolver
514 debugging, leave stdout open, because that's where the resolver writes its
515 debugging output.
516
517 When we close stderr (which implies we've also closed stdout), we also get rid
518 of any controlling terminal.
519
520 Arguments: None
521 Returns: Nothing
522 */
523
524 static void
525 close_unwanted(void)
526 {
527 if (smtp_input)
528 {
529 #ifdef SUPPORT_TLS
530 tls_close(TRUE, FALSE); /* Shut down the TLS library */
531 #endif
532 (void)close(fileno(smtp_in));
533 (void)close(fileno(smtp_out));
534 smtp_in = NULL;
535 }
536 else
537 {
538 (void)close(0); /* stdin */
539 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
540 if (debug_selector == 0) /* stderr */
541 {
542 if (!synchronous_delivery)
543 {
544 (void)close(2);
545 log_stderr = NULL;
546 }
547 (void)setsid();
548 }
549 }
550 }
551
552
553
554
555 /*************************************************
556 * Set uid and gid *
557 *************************************************/
558
559 /* This function sets a new uid and gid permanently, optionally calling
560 initgroups() to set auxiliary groups. There are some special cases when running
561 Exim in unprivileged modes. In these situations the effective uid will not be
562 root; if we already have the right effective uid/gid, and don't need to
563 initialize any groups, leave things as they are.
564
565 Arguments:
566 uid the uid
567 gid the gid
568 igflag TRUE if initgroups() wanted
569 msg text to use in debugging output and failure log
570
571 Returns: nothing; bombs out on failure
572 */
573
574 void
575 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
576 {
577 uid_t euid = geteuid();
578 gid_t egid = getegid();
579
580 if (euid == root_uid || euid != uid || egid != gid || igflag)
581 {
582 /* At least one OS returns +1 for initgroups failure, so just check for
583 non-zero. */
584
585 if (igflag)
586 {
587 struct passwd *pw = getpwuid(uid);
588 if (pw != NULL)
589 {
590 if (initgroups(pw->pw_name, gid) != 0)
591 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
592 (long int)uid, strerror(errno));
593 }
594 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
595 "no passwd entry for uid=%ld", (long int)uid);
596 }
597
598 if (setgid(gid) < 0 || setuid(uid) < 0)
599 {
600 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
601 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
602 }
603 }
604
605 /* Debugging output included uid/gid and all groups */
606
607 DEBUG(D_uid)
608 {
609 int group_count, save_errno;
610 gid_t group_list[NGROUPS_MAX];
611 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
612 (long int)geteuid(), (long int)getegid(), (long int)getpid());
613 group_count = getgroups(NGROUPS_MAX, group_list);
614 save_errno = errno;
615 debug_printf(" auxiliary group list:");
616 if (group_count > 0)
617 {
618 int i;
619 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
620 }
621 else if (group_count < 0)
622 debug_printf(" <error: %s>", strerror(save_errno));
623 else debug_printf(" <none>");
624 debug_printf("\n");
625 }
626 }
627
628
629
630
631 /*************************************************
632 * Exit point *
633 *************************************************/
634
635 /* Exim exits via this function so that it always clears up any open
636 databases.
637
638 Arguments:
639 rc return code
640
641 Returns: does not return
642 */
643
644 void
645 exim_exit(int rc)
646 {
647 search_tidyup();
648 DEBUG(D_any)
649 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
650 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
651 exit(rc);
652 }
653
654
655
656
657 /*************************************************
658 * Extract port from host address *
659 *************************************************/
660
661 /* Called to extract the port from the values given to -oMa and -oMi.
662 It also checks the syntax of the address, and terminates it before the
663 port data when a port is extracted.
664
665 Argument:
666 address the address, with possible port on the end
667
668 Returns: the port, or zero if there isn't one
669 bombs out on a syntax error
670 */
671
672 static int
673 check_port(uschar *address)
674 {
675 int port = host_address_extract_port(address);
676 if (string_is_ip_address(address, NULL) == 0)
677 {
678 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
679 exit(EXIT_FAILURE);
680 }
681 return port;
682 }
683
684
685
686 /*************************************************
687 * Test/verify an address *
688 *************************************************/
689
690 /* This function is called by the -bv and -bt code. It extracts a working
691 address from a full RFC 822 address. This isn't really necessary per se, but it
692 has the effect of collapsing source routes.
693
694 Arguments:
695 s the address string
696 flags flag bits for verify_address()
697 exit_value to be set for failures
698
699 Returns: nothing
700 */
701
702 static void
703 test_address(uschar *s, int flags, int *exit_value)
704 {
705 int start, end, domain;
706 uschar *parse_error = NULL;
707 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
708 FALSE);
709 if (address == NULL)
710 {
711 fprintf(stdout, "syntax error: %s\n", parse_error);
712 *exit_value = 2;
713 }
714 else
715 {
716 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
717 -1, -1, NULL, NULL, NULL);
718 if (rc == FAIL) *exit_value = 2;
719 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
720 }
721 }
722
723
724
725 /*************************************************
726 * Show supported features *
727 *************************************************/
728
729 /* This function is called for -bV/--version and for -d to output the optional
730 features of the current Exim binary.
731
732 Arguments: a FILE for printing
733 Returns: nothing
734 */
735
736 static void
737 show_whats_supported(FILE *f)
738 {
739 auth_info *authi;
740
741 #ifdef DB_VERSION_STRING
742 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
743 #elif defined(BTREEVERSION) && defined(HASHVERSION)
744 #ifdef USE_DB
745 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
746 #else
747 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
748 #endif
749 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
750 fprintf(f, "Probably ndbm\n");
751 #elif defined(USE_TDB)
752 fprintf(f, "Using tdb\n");
753 #else
754 #ifdef USE_GDBM
755 fprintf(f, "Probably GDBM (native mode)\n");
756 #else
757 fprintf(f, "Probably GDBM (compatibility mode)\n");
758 #endif
759 #endif
760
761 fprintf(f, "Support for:");
762 #ifdef SUPPORT_CRYPTEQ
763 fprintf(f, " crypteq");
764 #endif
765 #if HAVE_ICONV
766 fprintf(f, " iconv()");
767 #endif
768 #if HAVE_IPV6
769 fprintf(f, " IPv6");
770 #endif
771 #ifdef HAVE_SETCLASSRESOURCES
772 fprintf(f, " use_setclassresources");
773 #endif
774 #ifdef SUPPORT_PAM
775 fprintf(f, " PAM");
776 #endif
777 #ifdef EXIM_PERL
778 fprintf(f, " Perl");
779 #endif
780 #ifdef EXPAND_DLFUNC
781 fprintf(f, " Expand_dlfunc");
782 #endif
783 #ifdef USE_TCP_WRAPPERS
784 fprintf(f, " TCPwrappers");
785 #endif
786 #ifdef SUPPORT_TLS
787 #ifdef USE_GNUTLS
788 fprintf(f, " GnuTLS");
789 #else
790 fprintf(f, " OpenSSL");
791 #endif
792 #endif
793 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
794 fprintf(f, " translate_ip_address");
795 #endif
796 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
797 fprintf(f, " move_frozen_messages");
798 #endif
799 #ifdef WITH_CONTENT_SCAN
800 fprintf(f, " Content_Scanning");
801 #endif
802 #ifndef DISABLE_DKIM
803 fprintf(f, " DKIM");
804 #endif
805 #ifdef WITH_OLD_DEMIME
806 fprintf(f, " Old_Demime");
807 #endif
808 #ifndef DISABLE_PRDR
809 fprintf(f, " PRDR");
810 #endif
811 #ifndef DISABLE_OCSP
812 fprintf(f, " OCSP");
813 #endif
814 #ifdef EXPERIMENTAL_SPF
815 fprintf(f, " Experimental_SPF");
816 #endif
817 #ifdef EXPERIMENTAL_SRS
818 fprintf(f, " Experimental_SRS");
819 #endif
820 #ifdef EXPERIMENTAL_BRIGHTMAIL
821 fprintf(f, " Experimental_Brightmail");
822 #endif
823 #ifdef EXPERIMENTAL_DCC
824 fprintf(f, " Experimental_DCC");
825 #endif
826 #ifdef EXPERIMENTAL_DMARC
827 fprintf(f, " Experimental_DMARC");
828 #endif
829 #ifdef EXPERIMENTAL_PROXY
830 fprintf(f, " Experimental_Proxy");
831 #endif
832 #ifdef EXPERIMENTAL_TPDA
833 fprintf(f, " Experimental_TPDA");
834 #endif
835 #ifdef EXPERIMENTAL_REDIS
836 fprintf(f, " Experimental_Redis");
837 #endif
838 #ifdef EXPERIMENTAL_CERTNAMES
839 fprintf(f, " Experimental_Certnames");
840 #endif
841 #ifdef EXPERIMENTAL_DSN
842 fprintf(f, " Experimental_DSN");
843 #endif
844 fprintf(f, "\n");
845
846 fprintf(f, "Lookups (built-in):");
847 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
848 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
849 #endif
850 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
851 fprintf(f, " cdb");
852 #endif
853 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
854 fprintf(f, " dbm dbmjz dbmnz");
855 #endif
856 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
857 fprintf(f, " dnsdb");
858 #endif
859 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
860 fprintf(f, " dsearch");
861 #endif
862 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
863 fprintf(f, " ibase");
864 #endif
865 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
866 fprintf(f, " ldap ldapdn ldapm");
867 #endif
868 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
869 fprintf(f, " mysql");
870 #endif
871 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
872 fprintf(f, " nis nis0");
873 #endif
874 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
875 fprintf(f, " nisplus");
876 #endif
877 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
878 fprintf(f, " oracle");
879 #endif
880 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
881 fprintf(f, " passwd");
882 #endif
883 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
884 fprintf(f, " pgsql");
885 #endif
886 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
887 fprintf(f, " sqlite");
888 #endif
889 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
890 fprintf(f, " testdb");
891 #endif
892 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
893 fprintf(f, " whoson");
894 #endif
895 fprintf(f, "\n");
896
897 fprintf(f, "Authenticators:");
898 #ifdef AUTH_CRAM_MD5
899 fprintf(f, " cram_md5");
900 #endif
901 #ifdef AUTH_CYRUS_SASL
902 fprintf(f, " cyrus_sasl");
903 #endif
904 #ifdef AUTH_DOVECOT
905 fprintf(f, " dovecot");
906 #endif
907 #ifdef AUTH_GSASL
908 fprintf(f, " gsasl");
909 #endif
910 #ifdef AUTH_HEIMDAL_GSSAPI
911 fprintf(f, " heimdal_gssapi");
912 #endif
913 #ifdef AUTH_PLAINTEXT
914 fprintf(f, " plaintext");
915 #endif
916 #ifdef AUTH_SPA
917 fprintf(f, " spa");
918 #endif
919 fprintf(f, "\n");
920
921 fprintf(f, "Routers:");
922 #ifdef ROUTER_ACCEPT
923 fprintf(f, " accept");
924 #endif
925 #ifdef ROUTER_DNSLOOKUP
926 fprintf(f, " dnslookup");
927 #endif
928 #ifdef ROUTER_IPLITERAL
929 fprintf(f, " ipliteral");
930 #endif
931 #ifdef ROUTER_IPLOOKUP
932 fprintf(f, " iplookup");
933 #endif
934 #ifdef ROUTER_MANUALROUTE
935 fprintf(f, " manualroute");
936 #endif
937 #ifdef ROUTER_QUERYPROGRAM
938 fprintf(f, " queryprogram");
939 #endif
940 #ifdef ROUTER_REDIRECT
941 fprintf(f, " redirect");
942 #endif
943 fprintf(f, "\n");
944
945 fprintf(f, "Transports:");
946 #ifdef TRANSPORT_APPENDFILE
947 fprintf(f, " appendfile");
948 #ifdef SUPPORT_MAILDIR
949 fprintf(f, "/maildir");
950 #endif
951 #ifdef SUPPORT_MAILSTORE
952 fprintf(f, "/mailstore");
953 #endif
954 #ifdef SUPPORT_MBX
955 fprintf(f, "/mbx");
956 #endif
957 #endif
958 #ifdef TRANSPORT_AUTOREPLY
959 fprintf(f, " autoreply");
960 #endif
961 #ifdef TRANSPORT_LMTP
962 fprintf(f, " lmtp");
963 #endif
964 #ifdef TRANSPORT_PIPE
965 fprintf(f, " pipe");
966 #endif
967 #ifdef TRANSPORT_SMTP
968 fprintf(f, " smtp");
969 #endif
970 fprintf(f, "\n");
971
972 if (fixed_never_users[0] > 0)
973 {
974 int i;
975 fprintf(f, "Fixed never_users: ");
976 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
977 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
978 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
979 }
980
981 fprintf(f, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
982
983 /* Everything else is details which are only worth reporting when debugging.
984 Perhaps the tls_version_report should move into this too. */
985 DEBUG(D_any) do {
986
987 int i;
988
989 /* clang defines __GNUC__ (at least, for me) so test for it first */
990 #if defined(__clang__)
991 fprintf(f, "Compiler: CLang [%s]\n", __clang_version__);
992 #elif defined(__GNUC__)
993 fprintf(f, "Compiler: GCC [%s]\n",
994 # ifdef __VERSION__
995 __VERSION__
996 # else
997 "? unknown version ?"
998 # endif
999 );
1000 #else
1001 fprintf(f, "Compiler: <unknown>\n");
1002 #endif
1003
1004 #ifdef SUPPORT_TLS
1005 tls_version_report(f);
1006 #endif
1007
1008 for (authi = auths_available; *authi->driver_name != '\0'; ++authi) {
1009 if (authi->version_report) {
1010 (*authi->version_report)(f);
1011 }
1012 }
1013
1014 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1015 characters; unless it's an ancient version of PCRE in which case it
1016 is not defined. */
1017 #ifndef PCRE_PRERELEASE
1018 #define PCRE_PRERELEASE
1019 #endif
1020 #define QUOTE(X) #X
1021 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1022 fprintf(f, "Library version: PCRE: Compile: %d.%d%s\n"
1023 " Runtime: %s\n",
1024 PCRE_MAJOR, PCRE_MINOR,
1025 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1026 pcre_version());
1027 #undef QUOTE
1028 #undef EXPAND_AND_QUOTE
1029
1030 init_lookup_list();
1031 for (i = 0; i < lookup_list_count; i++)
1032 {
1033 if (lookup_list[i]->version_report)
1034 lookup_list[i]->version_report(f);
1035 }
1036
1037 #ifdef WHITELIST_D_MACROS
1038 fprintf(f, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1039 #else
1040 fprintf(f, "WHITELIST_D_MACROS unset\n");
1041 #endif
1042 #ifdef TRUSTED_CONFIG_LIST
1043 fprintf(f, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1044 #else
1045 fprintf(f, "TRUSTED_CONFIG_LIST unset\n");
1046 #endif
1047
1048 } while (0);
1049 }
1050
1051
1052 /*************************************************
1053 * Show auxiliary information about Exim *
1054 *************************************************/
1055
1056 static void
1057 show_exim_information(enum commandline_info request, FILE *stream)
1058 {
1059 const uschar **pp;
1060
1061 switch(request)
1062 {
1063 case CMDINFO_NONE:
1064 fprintf(stream, "Oops, something went wrong.\n");
1065 return;
1066 case CMDINFO_HELP:
1067 fprintf(stream,
1068 "The -bI: flag takes a string indicating which information to provide.\n"
1069 "If the string is not recognised, you'll get this help (on stderr).\n"
1070 "\n"
1071 " exim -bI:help this information\n"
1072 " exim -bI:dscp dscp value keywords known\n"
1073 " exim -bI:sieve list of supported sieve extensions, one per line.\n"
1074 );
1075 return;
1076 case CMDINFO_SIEVE:
1077 for (pp = exim_sieve_extension_list; *pp; ++pp)
1078 fprintf(stream, "%s\n", *pp);
1079 return;
1080 case CMDINFO_DSCP:
1081 dscp_list_to_stream(stream);
1082 return;
1083 }
1084 }
1085
1086
1087 /*************************************************
1088 * Quote a local part *
1089 *************************************************/
1090
1091 /* This function is used when a sender address or a From: or Sender: header
1092 line is being created from the caller's login, or from an authenticated_id. It
1093 applies appropriate quoting rules for a local part.
1094
1095 Argument: the local part
1096 Returns: the local part, quoted if necessary
1097 */
1098
1099 uschar *
1100 local_part_quote(uschar *lpart)
1101 {
1102 BOOL needs_quote = FALSE;
1103 int size, ptr;
1104 uschar *yield;
1105 uschar *t;
1106
1107 for (t = lpart; !needs_quote && *t != 0; t++)
1108 {
1109 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1110 (*t != '.' || t == lpart || t[1] == 0);
1111 }
1112
1113 if (!needs_quote) return lpart;
1114
1115 size = ptr = 0;
1116 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1117
1118 for (;;)
1119 {
1120 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1121 if (nq == NULL)
1122 {
1123 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1124 break;
1125 }
1126 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1127 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1128 yield = string_cat(yield, &size, &ptr, nq, 1);
1129 lpart = nq + 1;
1130 }
1131
1132 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1133 yield[ptr] = 0;
1134 return yield;
1135 }
1136
1137
1138
1139 #ifdef USE_READLINE
1140 /*************************************************
1141 * Load readline() functions *
1142 *************************************************/
1143
1144 /* This function is called from testing executions that read data from stdin,
1145 but only when running as the calling user. Currently, only -be does this. The
1146 function loads the readline() function library and passes back the functions.
1147 On some systems, it needs the curses library, so load that too, but try without
1148 it if loading fails. All this functionality has to be requested at build time.
1149
1150 Arguments:
1151 fn_readline_ptr pointer to where to put the readline pointer
1152 fn_addhist_ptr pointer to where to put the addhistory function
1153
1154 Returns: the dlopen handle or NULL on failure
1155 */
1156
1157 static void *
1158 set_readline(char * (**fn_readline_ptr)(const char *),
1159 void (**fn_addhist_ptr)(const char *))
1160 {
1161 void *dlhandle;
1162 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1163
1164 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1165 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1166
1167 if (dlhandle != NULL)
1168 {
1169 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1170 * char * readline (const char *prompt);
1171 * void add_history (const char *string);
1172 */
1173 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1174 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1175 }
1176 else
1177 {
1178 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1179 }
1180
1181 return dlhandle;
1182 }
1183 #endif
1184
1185
1186
1187 /*************************************************
1188 * Get a line from stdin for testing things *
1189 *************************************************/
1190
1191 /* This function is called when running tests that can take a number of lines
1192 of input (for example, -be and -bt). It handles continuations and trailing
1193 spaces. And prompting and a blank line output on eof. If readline() is in use,
1194 the arguments are non-NULL and provide the relevant functions.
1195
1196 Arguments:
1197 fn_readline readline function or NULL
1198 fn_addhist addhist function or NULL
1199
1200 Returns: pointer to dynamic memory, or NULL at end of file
1201 */
1202
1203 static uschar *
1204 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1205 {
1206 int i;
1207 int size = 0;
1208 int ptr = 0;
1209 uschar *yield = NULL;
1210
1211 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1212
1213 for (i = 0;; i++)
1214 {
1215 uschar buffer[1024];
1216 uschar *p, *ss;
1217
1218 #ifdef USE_READLINE
1219 char *readline_line = NULL;
1220 if (fn_readline != NULL)
1221 {
1222 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1223 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1224 p = US readline_line;
1225 }
1226 else
1227 #endif
1228
1229 /* readline() not in use */
1230
1231 {
1232 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1233 p = buffer;
1234 }
1235
1236 /* Handle the line */
1237
1238 ss = p + (int)Ustrlen(p);
1239 while (ss > p && isspace(ss[-1])) ss--;
1240
1241 if (i > 0)
1242 {
1243 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1244 }
1245
1246 yield = string_cat(yield, &size, &ptr, p, ss - p);
1247
1248 #ifdef USE_READLINE
1249 if (fn_readline != NULL) free(readline_line);
1250 #endif
1251
1252 if (ss == p || yield[ptr-1] != '\\')
1253 {
1254 yield[ptr] = 0;
1255 break;
1256 }
1257 yield[--ptr] = 0;
1258 }
1259
1260 if (yield == NULL) printf("\n");
1261 return yield;
1262 }
1263
1264
1265
1266 /*************************************************
1267 * Output usage information for the program *
1268 *************************************************/
1269
1270 /* This function is called when there are no recipients
1271 or a specific --help argument was added.
1272
1273 Arguments:
1274 progname information on what name we were called by
1275
1276 Returns: DOES NOT RETURN
1277 */
1278
1279 static void
1280 exim_usage(uschar *progname)
1281 {
1282
1283 /* Handle specific program invocation varients */
1284 if (Ustrcmp(progname, US"-mailq") == 0)
1285 {
1286 fprintf(stderr,
1287 "mailq - list the contents of the mail queue\n\n"
1288 "For a list of options, see the Exim documentation.\n");
1289 exit(EXIT_FAILURE);
1290 }
1291
1292 /* Generic usage - we output this whatever happens */
1293 fprintf(stderr,
1294 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1295 "not directly from a shell command line. Options and/or arguments control\n"
1296 "what it does when called. For a list of options, see the Exim documentation.\n");
1297
1298 exit(EXIT_FAILURE);
1299 }
1300
1301
1302
1303 /*************************************************
1304 * Validate that the macros given are okay *
1305 *************************************************/
1306
1307 /* Typically, Exim will drop privileges if macros are supplied. In some
1308 cases, we want to not do so.
1309
1310 Arguments: none (macros is a global)
1311 Returns: true if trusted, false otherwise
1312 */
1313
1314 static BOOL
1315 macros_trusted(void)
1316 {
1317 #ifdef WHITELIST_D_MACROS
1318 macro_item *m;
1319 uschar *whitelisted, *end, *p, **whites, **w;
1320 int white_count, i, n;
1321 size_t len;
1322 BOOL prev_char_item, found;
1323 #endif
1324
1325 if (macros == NULL)
1326 return TRUE;
1327 #ifndef WHITELIST_D_MACROS
1328 return FALSE;
1329 #else
1330
1331 /* We only trust -D overrides for some invoking users:
1332 root, the exim run-time user, the optional config owner user.
1333 I don't know why config-owner would be needed, but since they can own the
1334 config files anyway, there's no security risk to letting them override -D. */
1335 if ( ! ((real_uid == root_uid)
1336 || (real_uid == exim_uid)
1337 #ifdef CONFIGURE_OWNER
1338 || (real_uid == config_uid)
1339 #endif
1340 ))
1341 {
1342 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1343 return FALSE;
1344 }
1345
1346 /* Get a list of macros which are whitelisted */
1347 whitelisted = string_copy_malloc(US WHITELIST_D_MACROS);
1348 prev_char_item = FALSE;
1349 white_count = 0;
1350 for (p = whitelisted; *p != '\0'; ++p)
1351 {
1352 if (*p == ':' || isspace(*p))
1353 {
1354 *p = '\0';
1355 if (prev_char_item)
1356 ++white_count;
1357 prev_char_item = FALSE;
1358 continue;
1359 }
1360 if (!prev_char_item)
1361 prev_char_item = TRUE;
1362 }
1363 end = p;
1364 if (prev_char_item)
1365 ++white_count;
1366 if (!white_count)
1367 return FALSE;
1368 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1369 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1370 {
1371 if (*p != '\0')
1372 {
1373 whites[i++] = p;
1374 if (i == white_count)
1375 break;
1376 while (*p != '\0' && p < end)
1377 ++p;
1378 }
1379 }
1380 whites[i] = NULL;
1381
1382 /* The list of macros should be very short. Accept the N*M complexity. */
1383 for (m = macros; m != NULL; m = m->next)
1384 {
1385 found = FALSE;
1386 for (w = whites; *w; ++w)
1387 if (Ustrcmp(*w, m->name) == 0)
1388 {
1389 found = TRUE;
1390 break;
1391 }
1392 if (!found)
1393 return FALSE;
1394 if (m->replacement == NULL)
1395 continue;
1396 len = Ustrlen(m->replacement);
1397 if (len == 0)
1398 continue;
1399 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1400 0, PCRE_EOPT, NULL, 0);
1401 if (n < 0)
1402 {
1403 if (n != PCRE_ERROR_NOMATCH)
1404 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1405 return FALSE;
1406 }
1407 }
1408 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1409 return TRUE;
1410 #endif
1411 }
1412
1413
1414 /*************************************************
1415 * Entry point and high-level code *
1416 *************************************************/
1417
1418 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1419 the appropriate action. All the necessary functions are present in the one
1420 binary. I originally thought one should split it up, but it turns out that so
1421 much of the apparatus is needed in each chunk that one might as well just have
1422 it all available all the time, which then makes the coding easier as well.
1423
1424 Arguments:
1425 argc count of entries in argv
1426 argv argument strings, with argv[0] being the program name
1427
1428 Returns: EXIT_SUCCESS if terminated successfully
1429 EXIT_FAILURE otherwise, except when a message has been sent
1430 to the sender, and -oee was given
1431 */
1432
1433 int
1434 main(int argc, char **cargv)
1435 {
1436 uschar **argv = USS cargv;
1437 int arg_receive_timeout = -1;
1438 int arg_smtp_receive_timeout = -1;
1439 int arg_error_handling = error_handling;
1440 int filter_sfd = -1;
1441 int filter_ufd = -1;
1442 int group_count;
1443 int i, rv;
1444 int list_queue_option = 0;
1445 int msg_action = 0;
1446 int msg_action_arg = -1;
1447 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1448 int queue_only_reason = 0;
1449 #ifdef EXIM_PERL
1450 int perl_start_option = 0;
1451 #endif
1452 int recipients_arg = argc;
1453 int sender_address_domain = 0;
1454 int test_retry_arg = -1;
1455 int test_rewrite_arg = -1;
1456 BOOL arg_queue_only = FALSE;
1457 BOOL bi_option = FALSE;
1458 BOOL checking = FALSE;
1459 BOOL count_queue = FALSE;
1460 BOOL expansion_test = FALSE;
1461 BOOL extract_recipients = FALSE;
1462 BOOL flag_G = FALSE;
1463 BOOL flag_n = FALSE;
1464 BOOL forced_delivery = FALSE;
1465 BOOL f_end_dot = FALSE;
1466 BOOL deliver_give_up = FALSE;
1467 BOOL list_queue = FALSE;
1468 BOOL list_options = FALSE;
1469 BOOL local_queue_only;
1470 BOOL more = TRUE;
1471 BOOL one_msg_action = FALSE;
1472 BOOL queue_only_set = FALSE;
1473 BOOL receiving_message = TRUE;
1474 BOOL sender_ident_set = FALSE;
1475 BOOL session_local_queue_only;
1476 BOOL unprivileged;
1477 BOOL removed_privilege = FALSE;
1478 BOOL usage_wanted = FALSE;
1479 BOOL verify_address_mode = FALSE;
1480 BOOL verify_as_sender = FALSE;
1481 BOOL version_printed = FALSE;
1482 uschar *alias_arg = NULL;
1483 uschar *called_as = US"";
1484 uschar *cmdline_syslog_name = NULL;
1485 uschar *start_queue_run_id = NULL;
1486 uschar *stop_queue_run_id = NULL;
1487 uschar *expansion_test_message = NULL;
1488 uschar *ftest_domain = NULL;
1489 uschar *ftest_localpart = NULL;
1490 uschar *ftest_prefix = NULL;
1491 uschar *ftest_suffix = NULL;
1492 uschar *malware_test_file = NULL;
1493 uschar *real_sender_address;
1494 uschar *originator_home = US"/";
1495 size_t sz;
1496 void *reset_point;
1497
1498 struct passwd *pw;
1499 struct stat statbuf;
1500 pid_t passed_qr_pid = (pid_t)0;
1501 int passed_qr_pipe = -1;
1502 gid_t group_list[NGROUPS_MAX];
1503
1504 /* For the -bI: flag */
1505 enum commandline_info info_flag = CMDINFO_NONE;
1506 BOOL info_stdout = FALSE;
1507
1508 /* Possible options for -R and -S */
1509
1510 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1511
1512 /* Need to define this in case we need to change the environment in order
1513 to get rid of a bogus time zone. We have to make it char rather than uschar
1514 because some OS define it in /usr/include/unistd.h. */
1515
1516 extern char **environ;
1517
1518 /* If the Exim user and/or group and/or the configuration file owner/group were
1519 defined by ref:name at build time, we must now find the actual uid/gid values.
1520 This is a feature to make the lives of binary distributors easier. */
1521
1522 #ifdef EXIM_USERNAME
1523 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1524 {
1525 if (exim_uid == 0)
1526 {
1527 fprintf(stderr, "exim: refusing to run with uid 0 for \"%s\"\n",
1528 EXIM_USERNAME);
1529 exit(EXIT_FAILURE);
1530 }
1531 /* If ref:name uses a number as the name, route_finduser() returns
1532 TRUE with exim_uid set and pw coerced to NULL. */
1533 if (pw)
1534 exim_gid = pw->pw_gid;
1535 #ifndef EXIM_GROUPNAME
1536 else
1537 {
1538 fprintf(stderr,
1539 "exim: ref:name should specify a usercode, not a group.\n"
1540 "exim: can't let you get away with it unless you also specify a group.\n");
1541 exit(EXIT_FAILURE);
1542 }
1543 #endif
1544 }
1545 else
1546 {
1547 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1548 EXIM_USERNAME);
1549 exit(EXIT_FAILURE);
1550 }
1551 #endif
1552
1553 #ifdef EXIM_GROUPNAME
1554 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1555 {
1556 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1557 EXIM_GROUPNAME);
1558 exit(EXIT_FAILURE);
1559 }
1560 #endif
1561
1562 #ifdef CONFIGURE_OWNERNAME
1563 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1564 {
1565 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1566 CONFIGURE_OWNERNAME);
1567 exit(EXIT_FAILURE);
1568 }
1569 #endif
1570
1571 /* We default the system_filter_user to be the Exim run-time user, as a
1572 sane non-root value. */
1573 system_filter_uid = exim_uid;
1574
1575 #ifdef CONFIGURE_GROUPNAME
1576 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1577 {
1578 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1579 CONFIGURE_GROUPNAME);
1580 exit(EXIT_FAILURE);
1581 }
1582 #endif
1583
1584 /* In the Cygwin environment, some initialization needs doing. It is fudged
1585 in by means of this macro. */
1586
1587 #ifdef OS_INIT
1588 OS_INIT
1589 #endif
1590
1591 /* Check a field which is patched when we are running Exim within its
1592 testing harness; do a fast initial check, and then the whole thing. */
1593
1594 running_in_test_harness =
1595 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1596
1597 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1598 at the start of a program; however, it seems that some environments do not
1599 follow this. A "strange" locale can affect the formatting of timestamps, so we
1600 make quite sure. */
1601
1602 setlocale(LC_ALL, "C");
1603
1604 /* Set up the default handler for timing using alarm(). */
1605
1606 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1607
1608 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1609 because store_malloc writes a log entry on failure. */
1610
1611 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1612 if (log_buffer == NULL)
1613 {
1614 fprintf(stderr, "exim: failed to get store for log buffer\n");
1615 exit(EXIT_FAILURE);
1616 }
1617
1618 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1619 NULL when the daemon is run and the file is closed. We have to use this
1620 indirection, because some systems don't allow writing to the variable "stderr".
1621 */
1622
1623 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1624
1625 /* Arrange for the PCRE regex library to use our store functions. Note that
1626 the normal calls are actually macros that add additional arguments for
1627 debugging purposes so we have to assign specially constructed functions here.
1628 The default is to use store in the stacking pool, but this is overridden in the
1629 regex_must_compile() function. */
1630
1631 pcre_malloc = function_store_get;
1632 pcre_free = function_dummy_free;
1633
1634 /* Ensure there is a big buffer for temporary use in several places. It is put
1635 in malloc store so that it can be freed for enlargement if necessary. */
1636
1637 big_buffer = store_malloc(big_buffer_size);
1638
1639 /* Set up the handler for the data request signal, and set the initial
1640 descriptive text. */
1641
1642 set_process_info("initializing");
1643 os_restarting_signal(SIGUSR1, usr1_handler);
1644
1645 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1646 in the daemon code. For the rest of Exim's uses, we ignore it. */
1647
1648 signal(SIGHUP, SIG_IGN);
1649
1650 /* We don't want to die on pipe errors as the code is written to handle
1651 the write error instead. */
1652
1653 signal(SIGPIPE, SIG_IGN);
1654
1655 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1656 set to SIG_IGN. This causes subprocesses that complete before the parent
1657 process waits for them not to hang around, so when Exim calls wait(), nothing
1658 is there. The wait() code has been made robust against this, but let's ensure
1659 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1660 ending status. We use sigaction rather than plain signal() on those OS where
1661 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1662 problem on AIX with this.) */
1663
1664 #ifdef SA_NOCLDWAIT
1665 {
1666 struct sigaction act;
1667 act.sa_handler = SIG_DFL;
1668 sigemptyset(&(act.sa_mask));
1669 act.sa_flags = 0;
1670 sigaction(SIGCHLD, &act, NULL);
1671 }
1672 #else
1673 signal(SIGCHLD, SIG_DFL);
1674 #endif
1675
1676 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1677 SIGHUP. */
1678
1679 sighup_argv = argv;
1680
1681 /* Set up the version number. Set up the leading 'E' for the external form of
1682 message ids, set the pointer to the internal form, and initialize it to
1683 indicate no message being processed. */
1684
1685 version_init();
1686 message_id_option[0] = '-';
1687 message_id_external = message_id_option + 1;
1688 message_id_external[0] = 'E';
1689 message_id = message_id_external + 1;
1690 message_id[0] = 0;
1691
1692 /* Set the umask to zero so that any files Exim creates using open() are
1693 created with the modes that it specifies. NOTE: Files created with fopen() have
1694 a problem, which was not recognized till rather late (February 2006). With this
1695 umask, such files will be world writeable. (They are all content scanning files
1696 in the spool directory, which isn't world-accessible, so this is not a
1697 disaster, but it's untidy.) I don't want to change this overall setting,
1698 however, because it will interact badly with the open() calls. Instead, there's
1699 now a function called modefopen() that fiddles with the umask while calling
1700 fopen(). */
1701
1702 (void)umask(0);
1703
1704 /* Precompile the regular expression for matching a message id. Keep this in
1705 step with the code that generates ids in the accept.c module. We need to do
1706 this here, because the -M options check their arguments for syntactic validity
1707 using mac_ismsgid, which uses this. */
1708
1709 regex_ismsgid =
1710 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1711
1712 /* Precompile the regular expression that is used for matching an SMTP error
1713 code, possibly extended, at the start of an error message. Note that the
1714 terminating whitespace character is included. */
1715
1716 regex_smtp_code =
1717 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1718 FALSE, TRUE);
1719
1720 #ifdef WHITELIST_D_MACROS
1721 /* Precompile the regular expression used to filter the content of macros
1722 given to -D for permissibility. */
1723
1724 regex_whitelisted_macro =
1725 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1726 #endif
1727
1728
1729 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1730 this seems to be a generally accepted convention, since one finds symbolic
1731 links called "mailq" in standard OS configurations. */
1732
1733 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1734 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1735 {
1736 list_queue = TRUE;
1737 receiving_message = FALSE;
1738 called_as = US"-mailq";
1739 }
1740
1741 /* If the program is called as "rmail" treat it as equivalent to
1742 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1743 i.e. preventing a single dot on a line from terminating the message, and
1744 returning with zero return code, even in cases of error (provided an error
1745 message has been sent). */
1746
1747 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1748 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1749 {
1750 dot_ends = FALSE;
1751 called_as = US"-rmail";
1752 errors_sender_rc = EXIT_SUCCESS;
1753 }
1754
1755 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1756 this is a smail convention. */
1757
1758 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1759 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1760 {
1761 smtp_input = smtp_batched_input = TRUE;
1762 called_as = US"-rsmtp";
1763 }
1764
1765 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1766 this is a smail convention. */
1767
1768 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1769 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1770 {
1771 queue_interval = 0;
1772 receiving_message = FALSE;
1773 called_as = US"-runq";
1774 }
1775
1776 /* If the program is called as "newaliases" treat it as equivalent to
1777 "exim -bi"; this is a sendmail convention. */
1778
1779 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1780 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1781 {
1782 bi_option = TRUE;
1783 receiving_message = FALSE;
1784 called_as = US"-newaliases";
1785 }
1786
1787 /* Save the original effective uid for a couple of uses later. It should
1788 normally be root, but in some esoteric environments it may not be. */
1789
1790 original_euid = geteuid();
1791
1792 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1793 to be the same as the real ones. This makes a difference only if Exim is setuid
1794 (or setgid) to something other than root, which could be the case in some
1795 special configurations. */
1796
1797 real_uid = getuid();
1798 real_gid = getgid();
1799
1800 if (real_uid == root_uid)
1801 {
1802 rv = setgid(real_gid);
1803 if (rv)
1804 {
1805 fprintf(stderr, "exim: setgid(%ld) failed: %s\n",
1806 (long int)real_gid, strerror(errno));
1807 exit(EXIT_FAILURE);
1808 }
1809 rv = setuid(real_uid);
1810 if (rv)
1811 {
1812 fprintf(stderr, "exim: setuid(%ld) failed: %s\n",
1813 (long int)real_uid, strerror(errno));
1814 exit(EXIT_FAILURE);
1815 }
1816 }
1817
1818 /* If neither the original real uid nor the original euid was root, Exim is
1819 running in an unprivileged state. */
1820
1821 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1822
1823 /* Scan the program's arguments. Some can be dealt with right away; others are
1824 simply recorded for checking and handling afterwards. Do a high-level switch
1825 on the second character (the one after '-'), to save some effort. */
1826
1827 for (i = 1; i < argc; i++)
1828 {
1829 BOOL badarg = FALSE;
1830 uschar *arg = argv[i];
1831 uschar *argrest;
1832 int switchchar;
1833
1834 /* An argument not starting with '-' is the start of a recipients list;
1835 break out of the options-scanning loop. */
1836
1837 if (arg[0] != '-')
1838 {
1839 recipients_arg = i;
1840 break;
1841 }
1842
1843 /* An option consistion of -- terminates the options */
1844
1845 if (Ustrcmp(arg, "--") == 0)
1846 {
1847 recipients_arg = i + 1;
1848 break;
1849 }
1850
1851 /* Handle flagged options */
1852
1853 switchchar = arg[1];
1854 argrest = arg+2;
1855
1856 /* Make all -ex options synonymous with -oex arguments, since that
1857 is assumed by various callers. Also make -qR options synonymous with -R
1858 options, as that seems to be required as well. Allow for -qqR too, and
1859 the same for -S options. */
1860
1861 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1862 Ustrncmp(arg+1, "qR", 2) == 0 ||
1863 Ustrncmp(arg+1, "qS", 2) == 0)
1864 {
1865 switchchar = arg[2];
1866 argrest++;
1867 }
1868 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1869 {
1870 switchchar = arg[3];
1871 argrest += 2;
1872 queue_2stage = TRUE;
1873 }
1874
1875 /* Make -r synonymous with -f, since it is a documented alias */
1876
1877 else if (arg[1] == 'r') switchchar = 'f';
1878
1879 /* Make -ov synonymous with -v */
1880
1881 else if (Ustrcmp(arg, "-ov") == 0)
1882 {
1883 switchchar = 'v';
1884 argrest++;
1885 }
1886
1887 /* deal with --option_aliases */
1888 else if (switchchar == '-')
1889 {
1890 if (Ustrcmp(argrest, "help") == 0)
1891 {
1892 usage_wanted = TRUE;
1893 break;
1894 }
1895 else if (Ustrcmp(argrest, "version") == 0)
1896 {
1897 switchchar = 'b';
1898 argrest = US"V";
1899 }
1900 }
1901
1902 /* High-level switch on active initial letter */
1903
1904 switch(switchchar)
1905 {
1906
1907 /* sendmail uses -Ac and -Am to control which .cf file is used;
1908 we ignore them. */
1909 case 'A':
1910 if (*argrest == '\0') { badarg = TRUE; break; }
1911 else
1912 {
1913 BOOL ignore = FALSE;
1914 switch (*argrest)
1915 {
1916 case 'c':
1917 case 'm':
1918 if (*(argrest + 1) == '\0')
1919 ignore = TRUE;
1920 break;
1921 }
1922 if (!ignore) { badarg = TRUE; break; }
1923 }
1924 break;
1925
1926 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1927 so has no need of it. */
1928
1929 case 'B':
1930 if (*argrest == 0) i++; /* Skip over the type */
1931 break;
1932
1933
1934 case 'b':
1935 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1936
1937 /* -bd: Run in daemon mode, awaiting SMTP connections.
1938 -bdf: Ditto, but in the foreground.
1939 */
1940
1941 if (*argrest == 'd')
1942 {
1943 daemon_listen = TRUE;
1944 if (*(++argrest) == 'f') background_daemon = FALSE;
1945 else if (*argrest != 0) { badarg = TRUE; break; }
1946 }
1947
1948 /* -be: Run in expansion test mode
1949 -bem: Ditto, but read a message from a file first
1950 */
1951
1952 else if (*argrest == 'e')
1953 {
1954 expansion_test = checking = TRUE;
1955 if (argrest[1] == 'm')
1956 {
1957 if (++i >= argc) { badarg = TRUE; break; }
1958 expansion_test_message = argv[i];
1959 argrest++;
1960 }
1961 if (argrest[1] != 0) { badarg = TRUE; break; }
1962 }
1963
1964 /* -bF: Run system filter test */
1965
1966 else if (*argrest == 'F')
1967 {
1968 filter_test |= FTEST_SYSTEM;
1969 if (*(++argrest) != 0) { badarg = TRUE; break; }
1970 if (++i < argc) filter_test_sfile = argv[i]; else
1971 {
1972 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1973 exit(EXIT_FAILURE);
1974 }
1975 }
1976
1977 /* -bf: Run user filter test
1978 -bfd: Set domain for filter testing
1979 -bfl: Set local part for filter testing
1980 -bfp: Set prefix for filter testing
1981 -bfs: Set suffix for filter testing
1982 */
1983
1984 else if (*argrest == 'f')
1985 {
1986 if (*(++argrest) == 0)
1987 {
1988 filter_test |= FTEST_USER;
1989 if (++i < argc) filter_test_ufile = argv[i]; else
1990 {
1991 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1992 exit(EXIT_FAILURE);
1993 }
1994 }
1995 else
1996 {
1997 if (++i >= argc)
1998 {
1999 fprintf(stderr, "exim: string expected after %s\n", arg);
2000 exit(EXIT_FAILURE);
2001 }
2002 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2003 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2004 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2005 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2006 else { badarg = TRUE; break; }
2007 }
2008 }
2009
2010 /* -bh: Host checking - an IP address must follow. */
2011
2012 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
2013 {
2014 if (++i >= argc) { badarg = TRUE; break; }
2015 sender_host_address = argv[i];
2016 host_checking = checking = log_testing_mode = TRUE;
2017 host_checking_callout = argrest[1] == 'c';
2018 }
2019
2020 /* -bi: This option is used by sendmail to initialize *the* alias file,
2021 though it has the -oA option to specify a different file. Exim has no
2022 concept of *the* alias file, but since Sun's YP make script calls
2023 sendmail this way, some support must be provided. */
2024
2025 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
2026
2027 /* -bI: provide information, of the type to follow after a colon.
2028 This is an Exim flag. */
2029
2030 else if (argrest[0] == 'I' && Ustrlen(argrest) >= 2 && argrest[1] == ':')
2031 {
2032 uschar *p = &argrest[2];
2033 info_flag = CMDINFO_HELP;
2034 if (Ustrlen(p))
2035 {
2036 if (strcmpic(p, CUS"sieve") == 0)
2037 {
2038 info_flag = CMDINFO_SIEVE;
2039 info_stdout = TRUE;
2040 }
2041 else if (strcmpic(p, CUS"dscp") == 0)
2042 {
2043 info_flag = CMDINFO_DSCP;
2044 info_stdout = TRUE;
2045 }
2046 else if (strcmpic(p, CUS"help") == 0)
2047 {
2048 info_stdout = TRUE;
2049 }
2050 }
2051 }
2052
2053 /* -bm: Accept and deliver message - the default option. Reinstate
2054 receiving_message, which got turned off for all -b options. */
2055
2056 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
2057
2058 /* -bmalware: test the filename given for malware */
2059
2060 else if (Ustrcmp(argrest, "malware") == 0)
2061 {
2062 if (++i >= argc) { badarg = TRUE; break; }
2063 malware_test_file = argv[i];
2064 }
2065
2066 /* -bnq: For locally originating messages, do not qualify unqualified
2067 addresses. In the envelope, this causes errors; in header lines they
2068 just get left. */
2069
2070 else if (Ustrcmp(argrest, "nq") == 0)
2071 {
2072 allow_unqualified_sender = FALSE;
2073 allow_unqualified_recipient = FALSE;
2074 }
2075
2076 /* -bpxx: List the contents of the mail queue, in various forms. If
2077 the option is -bpc, just a queue count is needed. Otherwise, if the
2078 first letter after p is r, then order is random. */
2079
2080 else if (*argrest == 'p')
2081 {
2082 if (*(++argrest) == 'c')
2083 {
2084 count_queue = TRUE;
2085 if (*(++argrest) != 0) badarg = TRUE;
2086 break;
2087 }
2088
2089 if (*argrest == 'r')
2090 {
2091 list_queue_option = 8;
2092 argrest++;
2093 }
2094 else list_queue_option = 0;
2095
2096 list_queue = TRUE;
2097
2098 /* -bp: List the contents of the mail queue, top-level only */
2099
2100 if (*argrest == 0) {}
2101
2102 /* -bpu: List the contents of the mail queue, top-level undelivered */
2103
2104 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2105
2106 /* -bpa: List the contents of the mail queue, including all delivered */
2107
2108 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2109
2110 /* Unknown after -bp[r] */
2111
2112 else
2113 {
2114 badarg = TRUE;
2115 break;
2116 }
2117 }
2118
2119
2120 /* -bP: List the configuration variables given as the address list.
2121 Force -v, so configuration errors get displayed. */
2122
2123 else if (Ustrcmp(argrest, "P") == 0)
2124 {
2125 list_options = TRUE;
2126 debug_selector |= D_v;
2127 debug_file = stderr;
2128 }
2129
2130 /* -brt: Test retry configuration lookup */
2131
2132 else if (Ustrcmp(argrest, "rt") == 0)
2133 {
2134 test_retry_arg = i + 1;
2135 goto END_ARG;
2136 }
2137
2138 /* -brw: Test rewrite configuration */
2139
2140 else if (Ustrcmp(argrest, "rw") == 0)
2141 {
2142 test_rewrite_arg = i + 1;
2143 goto END_ARG;
2144 }
2145
2146 /* -bS: Read SMTP commands on standard input, but produce no replies -
2147 all errors are reported by sending messages. */
2148
2149 else if (Ustrcmp(argrest, "S") == 0)
2150 smtp_input = smtp_batched_input = receiving_message = TRUE;
2151
2152 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2153 on standard output. */
2154
2155 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
2156
2157 /* -bt: address testing mode */
2158
2159 else if (Ustrcmp(argrest, "t") == 0)
2160 address_test_mode = checking = log_testing_mode = TRUE;
2161
2162 /* -bv: verify addresses */
2163
2164 else if (Ustrcmp(argrest, "v") == 0)
2165 verify_address_mode = checking = log_testing_mode = TRUE;
2166
2167 /* -bvs: verify sender addresses */
2168
2169 else if (Ustrcmp(argrest, "vs") == 0)
2170 {
2171 verify_address_mode = checking = log_testing_mode = TRUE;
2172 verify_as_sender = TRUE;
2173 }
2174
2175 /* -bV: Print version string and support details */
2176
2177 else if (Ustrcmp(argrest, "V") == 0)
2178 {
2179 printf("Exim version %s #%s built %s\n", version_string,
2180 version_cnumber, version_date);
2181 printf("%s\n", CS version_copyright);
2182 version_printed = TRUE;
2183 show_whats_supported(stdout);
2184 }
2185
2186 /* -bw: inetd wait mode, accept a listening socket as stdin */
2187
2188 else if (*argrest == 'w')
2189 {
2190 inetd_wait_mode = TRUE;
2191 background_daemon = FALSE;
2192 daemon_listen = TRUE;
2193 if (*(++argrest) != '\0')
2194 {
2195 inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE);
2196 if (inetd_wait_timeout <= 0)
2197 {
2198 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2199 exit(EXIT_FAILURE);
2200 }
2201 }
2202 }
2203
2204 else badarg = TRUE;
2205 break;
2206
2207
2208 /* -C: change configuration file list; ignore if it isn't really
2209 a change! Enforce a prefix check if required. */
2210
2211 case 'C':
2212 if (*argrest == 0)
2213 {
2214 if(++i < argc) argrest = argv[i]; else
2215 { badarg = TRUE; break; }
2216 }
2217 if (Ustrcmp(config_main_filelist, argrest) != 0)
2218 {
2219 #ifdef ALT_CONFIG_PREFIX
2220 int sep = 0;
2221 int len = Ustrlen(ALT_CONFIG_PREFIX);
2222 uschar *list = argrest;
2223 uschar *filename;
2224 while((filename = string_nextinlist(&list, &sep, big_buffer,
2225 big_buffer_size)) != NULL)
2226 {
2227 if ((Ustrlen(filename) < len ||
2228 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2229 Ustrstr(filename, "/../") != NULL) &&
2230 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2231 {
2232 fprintf(stderr, "-C Permission denied\n");
2233 exit(EXIT_FAILURE);
2234 }
2235 }
2236 #endif
2237 if (real_uid != root_uid)
2238 {
2239 #ifdef TRUSTED_CONFIG_LIST
2240
2241 if (real_uid != exim_uid
2242 #ifdef CONFIGURE_OWNER
2243 && real_uid != config_uid
2244 #endif
2245 )
2246 trusted_config = FALSE;
2247 else
2248 {
2249 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2250 if (trust_list)
2251 {
2252 struct stat statbuf;
2253
2254 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2255 (statbuf.st_uid != root_uid /* owner not root */
2256 #ifdef CONFIGURE_OWNER
2257 && statbuf.st_uid != config_uid /* owner not the special one */
2258 #endif
2259 ) || /* or */
2260 (statbuf.st_gid != root_gid /* group not root */
2261 #ifdef CONFIGURE_GROUP
2262 && statbuf.st_gid != config_gid /* group not the special one */
2263 #endif
2264 && (statbuf.st_mode & 020) != 0 /* group writeable */
2265 ) || /* or */
2266 (statbuf.st_mode & 2) != 0) /* world writeable */
2267 {
2268 trusted_config = FALSE;
2269 fclose(trust_list);
2270 }
2271 else
2272 {
2273 /* Well, the trust list at least is up to scratch... */
2274 void *reset_point = store_get(0);
2275 uschar *trusted_configs[32];
2276 int nr_configs = 0;
2277 int i = 0;
2278
2279 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2280 {
2281 uschar *start = big_buffer, *nl;
2282 while (*start && isspace(*start))
2283 start++;
2284 if (*start != '/')
2285 continue;
2286 nl = Ustrchr(start, '\n');
2287 if (nl)
2288 *nl = 0;
2289 trusted_configs[nr_configs++] = string_copy(start);
2290 if (nr_configs == 32)
2291 break;
2292 }
2293 fclose(trust_list);
2294
2295 if (nr_configs)
2296 {
2297 int sep = 0;
2298 uschar *list = argrest;
2299 uschar *filename;
2300 while (trusted_config && (filename = string_nextinlist(&list,
2301 &sep, big_buffer, big_buffer_size)) != NULL)
2302 {
2303 for (i=0; i < nr_configs; i++)
2304 {
2305 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2306 break;
2307 }
2308 if (i == nr_configs)
2309 {
2310 trusted_config = FALSE;
2311 break;
2312 }
2313 }
2314 store_reset(reset_point);
2315 }
2316 else
2317 {
2318 /* No valid prefixes found in trust_list file. */
2319 trusted_config = FALSE;
2320 }
2321 }
2322 }
2323 else
2324 {
2325 /* Could not open trust_list file. */
2326 trusted_config = FALSE;
2327 }
2328 }
2329 #else
2330 /* Not root; don't trust config */
2331 trusted_config = FALSE;
2332 #endif
2333 }
2334
2335 config_main_filelist = argrest;
2336 config_changed = TRUE;
2337 }
2338 break;
2339
2340
2341 /* -D: set up a macro definition */
2342
2343 case 'D':
2344 #ifdef DISABLE_D_OPTION
2345 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
2346 exit(EXIT_FAILURE);
2347 #else
2348 {
2349 int ptr = 0;
2350 macro_item *mlast = NULL;
2351 macro_item *m;
2352 uschar name[24];
2353 uschar *s = argrest;
2354
2355 while (isspace(*s)) s++;
2356
2357 if (*s < 'A' || *s > 'Z')
2358 {
2359 fprintf(stderr, "exim: macro name set by -D must start with "
2360 "an upper case letter\n");
2361 exit(EXIT_FAILURE);
2362 }
2363
2364 while (isalnum(*s) || *s == '_')
2365 {
2366 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2367 s++;
2368 }
2369 name[ptr] = 0;
2370 if (ptr == 0) { badarg = TRUE; break; }
2371 while (isspace(*s)) s++;
2372 if (*s != 0)
2373 {
2374 if (*s++ != '=') { badarg = TRUE; break; }
2375 while (isspace(*s)) s++;
2376 }
2377
2378 for (m = macros; m != NULL; m = m->next)
2379 {
2380 if (Ustrcmp(m->name, name) == 0)
2381 {
2382 fprintf(stderr, "exim: duplicated -D in command line\n");
2383 exit(EXIT_FAILURE);
2384 }
2385 mlast = m;
2386 }
2387
2388 m = store_get(sizeof(macro_item) + Ustrlen(name));
2389 m->next = NULL;
2390 m->command_line = TRUE;
2391 if (mlast == NULL) macros = m; else mlast->next = m;
2392 Ustrcpy(m->name, name);
2393 m->replacement = string_copy(s);
2394
2395 if (clmacro_count >= MAX_CLMACROS)
2396 {
2397 fprintf(stderr, "exim: too many -D options on command line\n");
2398 exit(EXIT_FAILURE);
2399 }
2400 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2401 m->replacement);
2402 }
2403 #endif
2404 break;
2405
2406 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2407 The latter is now a no-op, retained for compatibility only. If -dd is used,
2408 debugging subprocesses of the daemon is disabled. */
2409
2410 case 'd':
2411 if (Ustrcmp(argrest, "ropcr") == 0)
2412 {
2413 /* drop_cr = TRUE; */
2414 }
2415
2416 /* Use an intermediate variable so that we don't set debugging while
2417 decoding the debugging bits. */
2418
2419 else
2420 {
2421 unsigned int selector = D_default;
2422 debug_selector = 0;
2423 debug_file = NULL;
2424 if (*argrest == 'd')
2425 {
2426 debug_daemon = TRUE;
2427 argrest++;
2428 }
2429 if (*argrest != 0)
2430 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2431 debug_options_count, US"debug", 0);
2432 debug_selector = selector;
2433 }
2434 break;
2435
2436
2437 /* -E: This is a local error message. This option is not intended for
2438 external use at all, but is not restricted to trusted callers because it
2439 does no harm (just suppresses certain error messages) and if Exim is run
2440 not setuid root it won't always be trusted when it generates error
2441 messages using this option. If there is a message id following -E, point
2442 message_reference at it, for logging. */
2443
2444 case 'E':
2445 local_error_message = TRUE;
2446 if (mac_ismsgid(argrest)) message_reference = argrest;
2447 break;
2448
2449
2450 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2451 option, so it looks as if historically the -oex options are also callable
2452 without the leading -o. So we have to accept them. Before the switch,
2453 anything starting -oe has been converted to -e. Exim does not support all
2454 of the sendmail error options. */
2455
2456 case 'e':
2457 if (Ustrcmp(argrest, "e") == 0)
2458 {
2459 arg_error_handling = ERRORS_SENDER;
2460 errors_sender_rc = EXIT_SUCCESS;
2461 }
2462 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2463 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2464 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2465 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2466 else badarg = TRUE;
2467 break;
2468
2469
2470 /* -F: Set sender's full name, used instead of the gecos entry from
2471 the password file. Since users can usually alter their gecos entries,
2472 there's no security involved in using this instead. The data can follow
2473 the -F or be in the next argument. */
2474
2475 case 'F':
2476 if (*argrest == 0)
2477 {
2478 if(++i < argc) argrest = argv[i]; else
2479 { badarg = TRUE; break; }
2480 }
2481 originator_name = argrest;
2482 sender_name_forced = TRUE;
2483 break;
2484
2485
2486 /* -f: Set sender's address - this value is only actually used if Exim is
2487 run by a trusted user, or if untrusted_set_sender is set and matches the
2488 address, except that the null address can always be set by any user. The
2489 test for this happens later, when the value given here is ignored when not
2490 permitted. For an untrusted user, the actual sender is still put in Sender:
2491 if it doesn't match the From: header (unless no_local_from_check is set).
2492 The data can follow the -f or be in the next argument. The -r switch is an
2493 obsolete form of -f but since there appear to be programs out there that
2494 use anything that sendmail has ever supported, better accept it - the
2495 synonymizing is done before the switch above.
2496
2497 At this stage, we must allow domain literal addresses, because we don't
2498 know what the setting of allow_domain_literals is yet. Ditto for trailing
2499 dots and strip_trailing_dot. */
2500
2501 case 'f':
2502 {
2503 int start, end;
2504 uschar *errmess;
2505 if (*argrest == 0)
2506 {
2507 if (i+1 < argc) argrest = argv[++i]; else
2508 { badarg = TRUE; break; }
2509 }
2510 if (*argrest == 0)
2511 {
2512 sender_address = string_sprintf(""); /* Ensure writeable memory */
2513 }
2514 else
2515 {
2516 uschar *temp = argrest + Ustrlen(argrest) - 1;
2517 while (temp >= argrest && isspace(*temp)) temp--;
2518 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2519 allow_domain_literals = TRUE;
2520 strip_trailing_dot = TRUE;
2521 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2522 &sender_address_domain, TRUE);
2523 allow_domain_literals = FALSE;
2524 strip_trailing_dot = FALSE;
2525 if (sender_address == NULL)
2526 {
2527 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2528 return EXIT_FAILURE;
2529 }
2530 }
2531 sender_address_forced = TRUE;
2532 }
2533 break;
2534
2535 /* -G: sendmail invocation to specify that it's a gateway submission and
2536 sendmail may complain about problems instead of fixing them.
2537 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2538 not at this time complain about problems. */
2539
2540 case 'G':
2541 flag_G = TRUE;
2542 break;
2543
2544 /* -h: Set the hop count for an incoming message. Exim does not currently
2545 support this; it always computes it by counting the Received: headers.
2546 To put it in will require a change to the spool header file format. */
2547
2548 case 'h':
2549 if (*argrest == 0)
2550 {
2551 if(++i < argc) argrest = argv[i]; else
2552 { badarg = TRUE; break; }
2553 }
2554 if (!isdigit(*argrest)) badarg = TRUE;
2555 break;
2556
2557
2558 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2559 not to be documented for sendmail but mailx (at least) uses it) */
2560
2561 case 'i':
2562 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2563 break;
2564
2565
2566 /* -L: set the identifier used for syslog; equivalent to setting
2567 syslog_processname in the config file, but needs to be an admin option. */
2568
2569 case 'L':
2570 if (*argrest == '\0')
2571 {
2572 if(++i < argc) argrest = argv[i]; else
2573 { badarg = TRUE; break; }
2574 }
2575 sz = Ustrlen(argrest);
2576 if (sz > 32)
2577 {
2578 fprintf(stderr, "exim: the -L syslog name is too long: \"%s\"\n", argrest);
2579 return EXIT_FAILURE;
2580 }
2581 if (sz < 1)
2582 {
2583 fprintf(stderr, "exim: the -L syslog name is too short\n");
2584 return EXIT_FAILURE;
2585 }
2586 cmdline_syslog_name = argrest;
2587 break;
2588
2589 case 'M':
2590 receiving_message = FALSE;
2591
2592 /* -MC: continue delivery of another message via an existing open
2593 file descriptor. This option is used for an internal call by the
2594 smtp transport when there is a pending message waiting to go to an
2595 address to which it has got a connection. Five subsequent arguments are
2596 required: transport name, host name, IP address, sequence number, and
2597 message_id. Transports may decline to create new processes if the sequence
2598 number gets too big. The channel is stdin. This (-MC) must be the last
2599 argument. There's a subsequent check that the real-uid is privileged.
2600
2601 If we are running in the test harness. delay for a bit, to let the process
2602 that set this one up complete. This makes for repeatability of the logging,
2603 etc. output. */
2604
2605 if (Ustrcmp(argrest, "C") == 0)
2606 {
2607 union sockaddr_46 interface_sock;
2608 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2609
2610 if (argc != i + 6)
2611 {
2612 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2613 return EXIT_FAILURE;
2614 }
2615
2616 if (msg_action_arg >= 0)
2617 {
2618 fprintf(stderr, "exim: incompatible arguments\n");
2619 return EXIT_FAILURE;
2620 }
2621
2622 continue_transport = argv[++i];
2623 continue_hostname = argv[++i];
2624 continue_host_address = argv[++i];
2625 continue_sequence = Uatoi(argv[++i]);
2626 msg_action = MSG_DELIVER;
2627 msg_action_arg = ++i;
2628 forced_delivery = TRUE;
2629 queue_run_pid = passed_qr_pid;
2630 queue_run_pipe = passed_qr_pipe;
2631
2632 if (!mac_ismsgid(argv[i]))
2633 {
2634 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2635 argv[i]);
2636 return EXIT_FAILURE;
2637 }
2638
2639 /* Set up $sending_ip_address and $sending_port */
2640
2641 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2642 &size) == 0)
2643 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2644 &sending_port);
2645 else
2646 {
2647 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2648 strerror(errno));
2649 return EXIT_FAILURE;
2650 }
2651
2652 if (running_in_test_harness) millisleep(500);
2653 break;
2654 }
2655
2656 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2657 precedes -MC (see above). The flag indicates that the host to which
2658 Exim is connected has accepted an AUTH sequence. */
2659
2660 else if (Ustrcmp(argrest, "CA") == 0)
2661 {
2662 smtp_authenticated = TRUE;
2663 break;
2664 }
2665
2666 #ifdef EXPERIMENTAL_DSN
2667 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2668 that exim is connected to supports the esmtp extension DSN */
2669 else if (strcmp(argrest, "CD") == 0)
2670 {
2671 smtp_use_dsn = TRUE;
2672 break;
2673 }
2674 #endif
2675
2676 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2677 it preceded -MC (see above) */
2678
2679 else if (Ustrcmp(argrest, "CP") == 0)
2680 {
2681 smtp_use_pipelining = TRUE;
2682 break;
2683 }
2684
2685 /* -MCQ: pass on the pid of the queue-running process that started
2686 this chain of deliveries and the fd of its synchronizing pipe; this
2687 is useful only when it precedes -MC (see above) */
2688
2689 else if (Ustrcmp(argrest, "CQ") == 0)
2690 {
2691 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2692 else badarg = TRUE;
2693 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2694 else badarg = TRUE;
2695 break;
2696 }
2697
2698 /* -MCS: set the smtp_use_size flag; this is useful only when it
2699 precedes -MC (see above) */
2700
2701 else if (Ustrcmp(argrest, "CS") == 0)
2702 {
2703 smtp_use_size = TRUE;
2704 break;
2705 }
2706
2707 /* -MCT: set the tls_offered flag; this is useful only when it
2708 precedes -MC (see above). The flag indicates that the host to which
2709 Exim is connected has offered TLS support. */
2710
2711 #ifdef SUPPORT_TLS
2712 else if (Ustrcmp(argrest, "CT") == 0)
2713 {
2714 tls_offered = TRUE;
2715 break;
2716 }
2717 #endif
2718
2719 /* -M[x]: various operations on the following list of message ids:
2720 -M deliver the messages, ignoring next retry times and thawing
2721 -Mc deliver the messages, checking next retry times, no thawing
2722 -Mf freeze the messages
2723 -Mg give up on the messages
2724 -Mt thaw the messages
2725 -Mrm remove the messages
2726 In the above cases, this must be the last option. There are also the
2727 following options which are followed by a single message id, and which
2728 act on that message. Some of them use the "recipient" addresses as well.
2729 -Mar add recipient(s)
2730 -Mmad mark all recipients delivered
2731 -Mmd mark recipients(s) delivered
2732 -Mes edit sender
2733 -Mset load a message for use with -be
2734 -Mvb show body
2735 -Mvc show copy (of whole message, in RFC 2822 format)
2736 -Mvh show header
2737 -Mvl show log
2738 */
2739
2740 else if (*argrest == 0)
2741 {
2742 msg_action = MSG_DELIVER;
2743 forced_delivery = deliver_force_thaw = TRUE;
2744 }
2745 else if (Ustrcmp(argrest, "ar") == 0)
2746 {
2747 msg_action = MSG_ADD_RECIPIENT;
2748 one_msg_action = TRUE;
2749 }
2750 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2751 else if (Ustrcmp(argrest, "es") == 0)
2752 {
2753 msg_action = MSG_EDIT_SENDER;
2754 one_msg_action = TRUE;
2755 }
2756 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2757 else if (Ustrcmp(argrest, "g") == 0)
2758 {
2759 msg_action = MSG_DELIVER;
2760 deliver_give_up = TRUE;
2761 }
2762 else if (Ustrcmp(argrest, "mad") == 0)
2763 {
2764 msg_action = MSG_MARK_ALL_DELIVERED;
2765 }
2766 else if (Ustrcmp(argrest, "md") == 0)
2767 {
2768 msg_action = MSG_MARK_DELIVERED;
2769 one_msg_action = TRUE;
2770 }
2771 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2772 else if (Ustrcmp(argrest, "set") == 0)
2773 {
2774 msg_action = MSG_LOAD;
2775 one_msg_action = TRUE;
2776 }
2777 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2778 else if (Ustrcmp(argrest, "vb") == 0)
2779 {
2780 msg_action = MSG_SHOW_BODY;
2781 one_msg_action = TRUE;
2782 }
2783 else if (Ustrcmp(argrest, "vc") == 0)
2784 {
2785 msg_action = MSG_SHOW_COPY;
2786 one_msg_action = TRUE;
2787 }
2788 else if (Ustrcmp(argrest, "vh") == 0)
2789 {
2790 msg_action = MSG_SHOW_HEADER;
2791 one_msg_action = TRUE;
2792 }
2793 else if (Ustrcmp(argrest, "vl") == 0)
2794 {
2795 msg_action = MSG_SHOW_LOG;
2796 one_msg_action = TRUE;
2797 }
2798 else { badarg = TRUE; break; }
2799
2800 /* All the -Mxx options require at least one message id. */
2801
2802 msg_action_arg = i + 1;
2803 if (msg_action_arg >= argc)
2804 {
2805 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2806 return EXIT_FAILURE;
2807 }
2808
2809 /* Some require only message ids to follow */
2810
2811 if (!one_msg_action)
2812 {
2813 int j;
2814 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2815 {
2816 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2817 argv[j], arg);
2818 return EXIT_FAILURE;
2819 }
2820 goto END_ARG; /* Remaining args are ids */
2821 }
2822
2823 /* Others require only one message id, possibly followed by addresses,
2824 which will be handled as normal arguments. */
2825
2826 else
2827 {
2828 if (!mac_ismsgid(argv[msg_action_arg]))
2829 {
2830 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2831 argv[msg_action_arg], arg);
2832 return EXIT_FAILURE;
2833 }
2834 i++;
2835 }
2836 break;
2837
2838
2839 /* Some programs seem to call the -om option without the leading o;
2840 for sendmail it askes for "me too". Exim always does this. */
2841
2842 case 'm':
2843 if (*argrest != 0) badarg = TRUE;
2844 break;
2845
2846
2847 /* -N: don't do delivery - a debugging option that stops transports doing
2848 their thing. It implies debugging at the D_v level. */
2849
2850 case 'N':
2851 if (*argrest == 0)
2852 {
2853 dont_deliver = TRUE;
2854 debug_selector |= D_v;
2855 debug_file = stderr;
2856 }
2857 else badarg = TRUE;
2858 break;
2859
2860
2861 /* -n: This means "don't alias" in sendmail, apparently.
2862 For normal invocations, it has no effect.
2863 It may affect some other options. */
2864
2865 case 'n':
2866 flag_n = TRUE;
2867 break;
2868
2869 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2870 option to the specified value. This form uses long names. We need to handle
2871 -O option=value and -Ooption=value. */
2872
2873 case 'O':
2874 if (*argrest == 0)
2875 {
2876 if (++i >= argc)
2877 {
2878 fprintf(stderr, "exim: string expected after -O\n");
2879 exit(EXIT_FAILURE);
2880 }
2881 }
2882 break;
2883
2884 case 'o':
2885
2886 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2887 file" option). */
2888
2889 if (*argrest == 'A')
2890 {
2891 alias_arg = argrest + 1;
2892 if (alias_arg[0] == 0)
2893 {
2894 if (i+1 < argc) alias_arg = argv[++i]; else
2895 {
2896 fprintf(stderr, "exim: string expected after -oA\n");
2897 exit(EXIT_FAILURE);
2898 }
2899 }
2900 }
2901
2902 /* -oB: Set a connection message max value for remote deliveries */
2903
2904 else if (*argrest == 'B')
2905 {
2906 uschar *p = argrest + 1;
2907 if (p[0] == 0)
2908 {
2909 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2910 {
2911 connection_max_messages = 1;
2912 p = NULL;
2913 }
2914 }
2915
2916 if (p != NULL)
2917 {
2918 if (!isdigit(*p))
2919 {
2920 fprintf(stderr, "exim: number expected after -oB\n");
2921 exit(EXIT_FAILURE);
2922 }
2923 connection_max_messages = Uatoi(p);
2924 }
2925 }
2926
2927 /* -odb: background delivery */
2928
2929 else if (Ustrcmp(argrest, "db") == 0)
2930 {
2931 synchronous_delivery = FALSE;
2932 arg_queue_only = FALSE;
2933 queue_only_set = TRUE;
2934 }
2935
2936 /* -odf: foreground delivery (smail-compatible option); same effect as
2937 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2938 */
2939
2940 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2941 {
2942 synchronous_delivery = TRUE;
2943 arg_queue_only = FALSE;
2944 queue_only_set = TRUE;
2945 }
2946
2947 /* -odq: queue only */
2948
2949 else if (Ustrcmp(argrest, "dq") == 0)
2950 {
2951 synchronous_delivery = FALSE;
2952 arg_queue_only = TRUE;
2953 queue_only_set = TRUE;
2954 }
2955
2956 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2957 but no remote delivery */
2958
2959 else if (Ustrcmp(argrest, "dqs") == 0)
2960 {
2961 queue_smtp = TRUE;
2962 arg_queue_only = FALSE;
2963 queue_only_set = TRUE;
2964 }
2965
2966 /* -oex: Sendmail error flags. As these are also accepted without the
2967 leading -o prefix, for compatibility with vacation and other callers,
2968 they are handled with -e above. */
2969
2970 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2971 -oitrue: Another sendmail syntax for the same */
2972
2973 else if (Ustrcmp(argrest, "i") == 0 ||
2974 Ustrcmp(argrest, "itrue") == 0)
2975 dot_ends = FALSE;
2976
2977 /* -oM*: Set various characteristics for an incoming message; actually
2978 acted on for trusted callers only. */
2979
2980 else if (*argrest == 'M')
2981 {
2982 if (i+1 >= argc)
2983 {
2984 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2985 exit(EXIT_FAILURE);
2986 }
2987
2988 /* -oMa: Set sender host address */
2989
2990 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2991
2992 /* -oMaa: Set authenticator name */
2993
2994 else if (Ustrcmp(argrest, "Maa") == 0)
2995 sender_host_authenticated = argv[++i];
2996
2997 /* -oMas: setting authenticated sender */
2998
2999 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
3000
3001 /* -oMai: setting authenticated id */
3002
3003 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
3004
3005 /* -oMi: Set incoming interface address */
3006
3007 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
3008
3009 /* -oMm: Message reference */
3010
3011 else if (Ustrcmp(argrest, "Mm") == 0)
3012 {
3013 if (!mac_ismsgid(argv[i+1]))
3014 {
3015 fprintf(stderr,"-oMm must be a valid message ID\n");
3016 exit(EXIT_FAILURE);
3017 }
3018 if (!trusted_config)
3019 {
3020 fprintf(stderr,"-oMm must be called by a trusted user/config\n");
3021 exit(EXIT_FAILURE);
3022 }
3023 message_reference = argv[++i];
3024 }
3025
3026 /* -oMr: Received protocol */
3027
3028 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
3029
3030 /* -oMs: Set sender host name */
3031
3032 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
3033
3034 /* -oMt: Set sender ident */
3035
3036 else if (Ustrcmp(argrest, "Mt") == 0)
3037 {
3038 sender_ident_set = TRUE;
3039 sender_ident = argv[++i];
3040 }
3041
3042 /* Else a bad argument */
3043
3044 else
3045 {
3046 badarg = TRUE;
3047 break;
3048 }
3049 }
3050
3051 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3052 seem to call this as -m (undocumented), so that is also accepted (see
3053 above). */
3054
3055 else if (Ustrcmp(argrest, "m") == 0) {}
3056
3057 /* -oo: An ancient flag for old-style addresses which still seems to
3058 crop up in some calls (see in SCO). */
3059
3060 else if (Ustrcmp(argrest, "o") == 0) {}
3061
3062 /* -oP <name>: set pid file path for daemon */
3063
3064 else if (Ustrcmp(argrest, "P") == 0)
3065 override_pid_file_path = argv[++i];
3066
3067 /* -or <n>: set timeout for non-SMTP acceptance
3068 -os <n>: set timeout for SMTP acceptance */
3069
3070 else if (*argrest == 'r' || *argrest == 's')
3071 {
3072 int *tp = (*argrest == 'r')?
3073 &arg_receive_timeout : &arg_smtp_receive_timeout;
3074 if (argrest[1] == 0)
3075 {
3076 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
3077 }
3078 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
3079 if (*tp < 0)
3080 {
3081 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3082 exit(EXIT_FAILURE);
3083 }
3084 }
3085
3086 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3087
3088 else if (Ustrcmp(argrest, "X") == 0)
3089 override_local_interfaces = argv[++i];
3090
3091 /* Unknown -o argument */
3092
3093 else badarg = TRUE;
3094 break;
3095
3096
3097 /* -ps: force Perl startup; -pd force delayed Perl startup */
3098
3099 case 'p':
3100 #ifdef EXIM_PERL
3101 if (*argrest == 's' && argrest[1] == 0)
3102 {
3103 perl_start_option = 1;
3104 break;
3105 }
3106 if (*argrest == 'd' && argrest[1] == 0)
3107 {
3108 perl_start_option = -1;
3109 break;
3110 }
3111 #endif
3112
3113 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3114 which sets the host protocol and host name */
3115
3116 if (*argrest == 0)
3117 {
3118 if (i+1 < argc) argrest = argv[++i]; else
3119 { badarg = TRUE; break; }
3120 }
3121
3122 if (*argrest != 0)
3123 {
3124 uschar *hn = Ustrchr(argrest, ':');
3125 if (hn == NULL)
3126 {
3127 received_protocol = argrest;
3128 }
3129 else
3130 {
3131 received_protocol = string_copyn(argrest, hn - argrest);
3132 sender_host_name = hn + 1;
3133 }
3134 }
3135 break;
3136
3137
3138 case 'q':
3139 receiving_message = FALSE;
3140 if (queue_interval >= 0)
3141 {
3142 fprintf(stderr, "exim: -q specified more than once\n");
3143 exit(EXIT_FAILURE);
3144 }
3145
3146 /* -qq...: Do queue runs in a 2-stage manner */
3147
3148 if (*argrest == 'q')
3149 {
3150 queue_2stage = TRUE;
3151 argrest++;
3152 }
3153
3154 /* -qi...: Do only first (initial) deliveries */
3155
3156 if (*argrest == 'i')
3157 {
3158 queue_run_first_delivery = TRUE;
3159 argrest++;
3160 }
3161
3162 /* -qf...: Run the queue, forcing deliveries
3163 -qff..: Ditto, forcing thawing as well */
3164
3165 if (*argrest == 'f')
3166 {
3167 queue_run_force = TRUE;
3168 if (*(++argrest) == 'f')
3169 {
3170 deliver_force_thaw = TRUE;
3171 argrest++;
3172 }
3173 }
3174
3175 /* -q[f][f]l...: Run the queue only on local deliveries */
3176
3177 if (*argrest == 'l')
3178 {
3179 queue_run_local = TRUE;
3180 argrest++;
3181 }
3182
3183 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
3184 optionally starting from a given message id. */
3185
3186 if (*argrest == 0 &&
3187 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3188 {
3189 queue_interval = 0;
3190 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3191 start_queue_run_id = argv[++i];
3192 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3193 stop_queue_run_id = argv[++i];
3194 }
3195
3196 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
3197 optionally local only. */
3198
3199 else
3200 {
3201 if (*argrest != 0)
3202 queue_interval = readconf_readtime(argrest, 0, FALSE);
3203 else
3204 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
3205 if (queue_interval <= 0)
3206 {
3207 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
3208 exit(EXIT_FAILURE);
3209 }
3210 }
3211 break;
3212
3213
3214 case 'R': /* Synonymous with -qR... */
3215 receiving_message = FALSE;
3216
3217 /* -Rf: As -R (below) but force all deliveries,
3218 -Rff: Ditto, but also thaw all frozen messages,
3219 -Rr: String is regex
3220 -Rrf: Regex and force
3221 -Rrff: Regex and force and thaw
3222
3223 in all cases provided there are no further characters in this
3224 argument. */
3225
3226 if (*argrest != 0)
3227 {
3228 int i;
3229 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3230 {
3231 if (Ustrcmp(argrest, rsopts[i]) == 0)
3232 {
3233 if (i != 2) queue_run_force = TRUE;
3234 if (i >= 2) deliver_selectstring_regex = TRUE;
3235 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3236 argrest += Ustrlen(rsopts[i]);
3237 }
3238 }
3239 }
3240
3241 /* -R: Set string to match in addresses for forced queue run to
3242 pick out particular messages. */
3243
3244 if (*argrest == 0)
3245 {
3246 if (i+1 < argc) deliver_selectstring = argv[++i]; else
3247 {
3248 fprintf(stderr, "exim: string expected after -R\n");
3249 exit(EXIT_FAILURE);
3250 }
3251 }
3252 else deliver_selectstring = argrest;
3253 break;
3254
3255
3256 /* -r: an obsolete synonym for -f (see above) */
3257
3258
3259 /* -S: Like -R but works on sender. */
3260
3261 case 'S': /* Synonymous with -qS... */
3262 receiving_message = FALSE;
3263
3264 /* -Sf: As -S (below) but force all deliveries,
3265 -Sff: Ditto, but also thaw all frozen messages,
3266 -Sr: String is regex
3267 -Srf: Regex and force
3268 -Srff: Regex and force and thaw
3269
3270 in all cases provided there are no further characters in this
3271 argument. */
3272
3273 if (*argrest != 0)
3274 {
3275 int i;
3276 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
3277 {
3278 if (Ustrcmp(argrest, rsopts[i]) == 0)
3279 {
3280 if (i != 2) queue_run_force = TRUE;
3281 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
3282 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
3283 argrest += Ustrlen(rsopts[i]);
3284 }
3285 }
3286 }
3287
3288 /* -S: Set string to match in addresses for forced queue run to
3289 pick out particular messages. */
3290
3291 if (*argrest == 0)
3292 {
3293 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
3294 {
3295 fprintf(stderr, "exim: string expected after -S\n");
3296 exit(EXIT_FAILURE);
3297 }
3298 }
3299 else deliver_selectstring_sender = argrest;
3300 break;
3301
3302 /* -Tqt is an option that is exclusively for use by the testing suite.
3303 It is not recognized in other circumstances. It allows for the setting up
3304 of explicit "queue times" so that various warning/retry things can be
3305 tested. Otherwise variability of clock ticks etc. cause problems. */
3306
3307 case 'T':
3308 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3309 fudged_queue_times = argv[++i];
3310 else badarg = TRUE;
3311 break;
3312
3313
3314 /* -t: Set flag to extract recipients from body of message. */
3315
3316 case 't':
3317 if (*argrest == 0) extract_recipients = TRUE;
3318
3319 /* -ti: Set flag to extract recipients from body of message, and also
3320 specify that dot does not end the message. */
3321
3322 else if (Ustrcmp(argrest, "i") == 0)
3323 {
3324 extract_recipients = TRUE;
3325 dot_ends = FALSE;
3326 }
3327
3328 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3329
3330 #ifdef SUPPORT_TLS
3331 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3332 #endif
3333
3334 else badarg = TRUE;
3335 break;
3336
3337
3338 /* -U: This means "initial user submission" in sendmail, apparently. The
3339 doc claims that in future sendmail may refuse syntactically invalid
3340 messages instead of fixing them. For the moment, we just ignore it. */
3341
3342 case 'U':
3343 break;
3344
3345
3346 /* -v: verify things - this is a very low-level debugging */
3347
3348 case 'v':
3349 if (*argrest == 0)
3350 {
3351 debug_selector |= D_v;
3352 debug_file = stderr;
3353 }
3354 else badarg = TRUE;
3355 break;
3356
3357
3358 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3359
3360 The -x flag tells the sendmail command that mail from a local
3361 mail program has National Language Support (NLS) extended characters
3362 in the body of the mail item. The sendmail command can send mail with
3363 extended NLS characters across networks that normally corrupts these
3364 8-bit characters.
3365
3366 As Exim is 8-bit clean, it just ignores this flag. */
3367
3368 case 'x':
3369 if (*argrest != 0) badarg = TRUE;
3370 break;
3371
3372 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3373 logs to that file. We swallow the parameter and otherwise ignore it. */
3374
3375 case 'X':
3376 if (*argrest == '\0')
3377 {
3378 if (++i >= argc)
3379 {
3380 fprintf(stderr, "exim: string expected after -X\n");
3381 exit(EXIT_FAILURE);
3382 }
3383 }
3384 break;
3385
3386 /* All other initial characters are errors */
3387
3388 default:
3389 badarg = TRUE;
3390 break;
3391 } /* End of high-level switch statement */
3392
3393 /* Failed to recognize the option, or syntax error */
3394
3395 if (badarg)
3396 {
3397 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
3398 "option %s\n", arg);
3399 exit(EXIT_FAILURE);
3400 }
3401 }
3402
3403
3404 /* If -R or -S have been specified without -q, assume a single queue run. */
3405
3406 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
3407 queue_interval < 0) queue_interval = 0;
3408
3409
3410 END_ARG:
3411 /* If usage_wanted is set we call the usage function - which never returns */
3412 if (usage_wanted) exim_usage(called_as);
3413
3414 /* Arguments have been processed. Check for incompatibilities. */
3415 if ((
3416 (smtp_input || extract_recipients || recipients_arg < argc) &&
3417 (daemon_listen || queue_interval >= 0 || bi_option ||
3418 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3419 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3420 ) ||
3421 (
3422 msg_action_arg > 0 &&
3423 (daemon_listen || queue_interval >= 0 || list_options ||
3424 (checking && msg_action != MSG_LOAD) ||
3425 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3426 ) ||
3427 (
3428 (daemon_listen || queue_interval >= 0) &&
3429 (sender_address != NULL || list_options || list_queue || checking ||
3430 bi_option)
3431 ) ||
3432 (
3433 daemon_listen && queue_interval == 0
3434 ) ||
3435 (
3436 inetd_wait_mode && queue_interval >= 0
3437 ) ||
3438 (
3439 list_options &&
3440 (checking || smtp_input || extract_recipients ||
3441 filter_test != FTEST_NONE || bi_option)
3442 ) ||
3443 (
3444 verify_address_mode &&
3445 (address_test_mode || smtp_input || extract_recipients ||
3446 filter_test != FTEST_NONE || bi_option)
3447 ) ||
3448 (
3449 address_test_mode && (smtp_input || extract_recipients ||
3450 filter_test != FTEST_NONE || bi_option)
3451 ) ||
3452 (
3453 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3454 extract_recipients)
3455 ) ||
3456 (
3457 deliver_selectstring != NULL && queue_interval < 0
3458 ) ||
3459 (
3460 msg_action == MSG_LOAD &&
3461 (!expansion_test || expansion_test_message != NULL)
3462 )
3463 )
3464 {
3465 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3466 exit(EXIT_FAILURE);
3467 }
3468
3469 /* If debugging is set up, set the file and the file descriptor to pass on to
3470 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3471 to run in the foreground. */
3472
3473 if (debug_selector != 0)
3474 {
3475 debug_file = stderr;
3476 debug_fd = fileno(debug_file);
3477 background_daemon = FALSE;
3478 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3479 if (debug_selector != D_v) /* -v only doesn't show this */
3480 {
3481 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3482 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3483 debug_selector);
3484 if (!version_printed)
3485 show_whats_supported(stderr);
3486 }
3487 }
3488
3489 /* When started with root privilege, ensure that the limits on the number of
3490 open files and the number of processes (where that is accessible) are
3491 sufficiently large, or are unset, in case Exim has been called from an
3492 environment where the limits are screwed down. Not all OS have the ability to
3493 change some of these limits. */
3494
3495 if (unprivileged)
3496 {
3497 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3498 }
3499 else
3500 {
3501 struct rlimit rlp;
3502
3503 #ifdef RLIMIT_NOFILE
3504 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3505 {
3506 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3507 strerror(errno));
3508 rlp.rlim_cur = rlp.rlim_max = 0;
3509 }
3510
3511 /* I originally chose 1000 as a nice big number that was unlikely to
3512 be exceeded. It turns out that some older OS have a fixed upper limit of
3513 256. */
3514
3515 if (rlp.rlim_cur < 1000)
3516 {
3517 rlp.rlim_cur = rlp.rlim_max = 1000;
3518 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3519 {
3520 rlp.rlim_cur = rlp.rlim_max = 256;
3521 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3522 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3523 strerror(errno));
3524 }
3525 }
3526 #endif
3527
3528 #ifdef RLIMIT_NPROC
3529 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3530 {
3531 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3532 strerror(errno));
3533 rlp.rlim_cur = rlp.rlim_max = 0;
3534 }
3535
3536 #ifdef RLIM_INFINITY
3537 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3538 {
3539 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3540 #else
3541 if (rlp.rlim_cur < 1000)
3542 {
3543 rlp.rlim_cur = rlp.rlim_max = 1000;
3544 #endif
3545 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3546 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3547 strerror(errno));
3548 }
3549 #endif
3550 }
3551
3552 /* Exim is normally entered as root (but some special configurations are
3553 possible that don't do this). However, it always spins off sub-processes that
3554 set their uid and gid as required for local delivery. We don't want to pass on
3555 any extra groups that root may belong to, so we want to get rid of them all at
3556 this point.
3557
3558 We need to obey setgroups() at this stage, before possibly giving up root
3559 privilege for a changed configuration file, but later on we might need to
3560 check on the additional groups for the admin user privilege - can't do that
3561 till after reading the config, which might specify the exim gid. Therefore,
3562 save the group list here first. */
3563
3564 group_count = getgroups(NGROUPS_MAX, group_list);
3565 if (group_count < 0)
3566 {
3567 fprintf(stderr, "exim: getgroups() failed: %s\n", strerror(errno));
3568 exit(EXIT_FAILURE);
3569 }
3570
3571 /* There is a fundamental difference in some BSD systems in the matter of
3572 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3573 known not to be different. On the "different" systems there is a single group
3574 list, and the first entry in it is the current group. On all other versions of
3575 Unix there is a supplementary group list, which is in *addition* to the current
3576 group. Consequently, to get rid of all extraneous groups on a "standard" system
3577 you pass over 0 groups to setgroups(), while on a "different" system you pass
3578 over a single group - the current group, which is always the first group in the
3579 list. Calling setgroups() with zero groups on a "different" system results in
3580 an error return. The following code should cope with both types of system.
3581
3582 However, if this process isn't running as root, setgroups() can't be used
3583 since you have to be root to run it, even if throwing away groups. Not being
3584 root here happens only in some unusual configurations. We just ignore the
3585 error. */
3586
3587 if (setgroups(0, NULL) != 0)
3588 {
3589 if (setgroups(1, group_list) != 0 && !unprivileged)
3590 {
3591 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3592 exit(EXIT_FAILURE);
3593 }
3594 }
3595
3596 /* If the configuration file name has been altered by an argument on the
3597 command line (either a new file name or a macro definition) and the caller is
3598 not root, or if this is a filter testing run, remove any setuid privilege the
3599 program has and run as the underlying user.
3600
3601 The exim user is locked out of this, which severely restricts the use of -C
3602 for some purposes.
3603
3604 Otherwise, set the real ids to the effective values (should be root unless run
3605 from inetd, which it can either be root or the exim uid, if one is configured).
3606
3607 There is a private mechanism for bypassing some of this, in order to make it
3608 possible to test lots of configurations automatically, without having either to
3609 recompile each time, or to patch in an actual configuration file name and other
3610 values (such as the path name). If running in the test harness, pretend that
3611 configuration file changes and macro definitions haven't happened. */
3612
3613 if (( /* EITHER */
3614 (!trusted_config || /* Config changed, or */
3615 !macros_trusted()) && /* impermissible macros and */
3616 real_uid != root_uid && /* Not root, and */
3617 !running_in_test_harness /* Not fudged */
3618 ) || /* OR */
3619 expansion_test /* expansion testing */
3620 || /* OR */
3621 filter_test != FTEST_NONE) /* Filter testing */
3622 {
3623 setgroups(group_count, group_list);
3624 exim_setugid(real_uid, real_gid, FALSE,
3625 US"-C, -D, -be or -bf forces real uid");
3626 removed_privilege = TRUE;
3627
3628 /* In the normal case when Exim is called like this, stderr is available
3629 and should be used for any logging information because attempts to write
3630 to the log will usually fail. To arrange this, we unset really_exim. However,
3631 if no stderr is available there is no point - we might as well have a go
3632 at the log (if it fails, syslog will be written).
3633
3634 Note that if the invoker is Exim, the logs remain available. Messing with
3635 this causes unlogged successful deliveries. */
3636
3637 if ((log_stderr != NULL) && (real_uid != exim_uid))
3638 really_exim = FALSE;
3639 }
3640
3641 /* Privilege is to be retained for the moment. It may be dropped later,
3642 depending on the job that this Exim process has been asked to do. For now, set
3643 the real uid to the effective so that subsequent re-execs of Exim are done by a
3644 privileged user. */
3645
3646 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3647
3648 /* If testing a filter, open the file(s) now, before wasting time doing other
3649 setups and reading the message. */
3650
3651 if ((filter_test & FTEST_SYSTEM) != 0)
3652 {
3653 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3654 if (filter_sfd < 0)
3655 {
3656 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3657 strerror(errno));
3658 return EXIT_FAILURE;
3659 }
3660 }
3661
3662 if ((filter_test & FTEST_USER) != 0)
3663 {
3664 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3665 if (filter_ufd < 0)
3666 {
3667 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3668 strerror(errno));
3669 return EXIT_FAILURE;
3670 }
3671 }
3672
3673 /* Initialise lookup_list
3674 If debugging, already called above via version reporting.
3675 In either case, we initialise the list of available lookups while running
3676 as root. All dynamically modules are loaded from a directory which is
3677 hard-coded into the binary and is code which, if not a module, would be
3678 part of Exim already. Ability to modify the content of the directory
3679 is equivalent to the ability to modify a setuid binary!
3680
3681 This needs to happen before we read the main configuration. */
3682 init_lookup_list();
3683
3684 /* Read the main runtime configuration data; this gives up if there
3685 is a failure. It leaves the configuration file open so that the subsequent
3686 configuration data for delivery can be read if needed. */
3687
3688 readconf_main();
3689
3690 /* If an action on specific messages is requested, or if a daemon or queue
3691 runner is being started, we need to know if Exim was called by an admin user.
3692 This is the case if the real user is root or exim, or if the real group is
3693 exim, or if one of the supplementary groups is exim or a group listed in
3694 admin_groups. We don't fail all message actions immediately if not admin_user,
3695 since some actions can be performed by non-admin users. Instead, set admin_user
3696 for later interrogation. */
3697
3698 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3699 admin_user = TRUE;
3700 else
3701 {
3702 int i, j;
3703 for (i = 0; i < group_count; i++)
3704 {
3705 if (group_list[i] == exim_gid) admin_user = TRUE;
3706 else if (admin_groups != NULL)
3707 {
3708 for (j = 1; j <= (int)(admin_groups[0]); j++)
3709 if (admin_groups[j] == group_list[i])
3710 { admin_user = TRUE; break; }
3711 }
3712 if (admin_user) break;
3713 }
3714 }
3715
3716 /* Another group of privileged users are the trusted users. These are root,
3717 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3718 are permitted to specify sender_addresses with -f on the command line, and
3719 other message parameters as well. */
3720
3721 if (real_uid == root_uid || real_uid == exim_uid)
3722 trusted_caller = TRUE;
3723 else
3724 {
3725 int i, j;
3726
3727 if (trusted_users != NULL)
3728 {
3729 for (i = 1; i <= (int)(trusted_users[0]); i++)
3730 if (trusted_users[i] == real_uid)
3731 { trusted_caller = TRUE; break; }
3732 }
3733
3734 if (!trusted_caller && trusted_groups != NULL)
3735 {
3736 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3737 {
3738 if (trusted_groups[i] == real_gid)
3739 trusted_caller = TRUE;
3740 else for (j = 0; j < group_count; j++)
3741 {
3742 if (trusted_groups[i] == group_list[j])
3743 { trusted_caller = TRUE; break; }
3744 }
3745 if (trusted_caller) break;
3746 }
3747 }
3748 }
3749
3750 /* Handle the decoding of logging options. */
3751
3752 decode_bits(&log_write_selector, &log_extra_selector, 0, 0,
3753 log_selector_string, log_options, log_options_count, US"log", 0);
3754
3755 DEBUG(D_any)
3756 {
3757 debug_printf("configuration file is %s\n", config_main_filename);
3758 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3759 log_extra_selector);
3760 }
3761
3762 /* If domain literals are not allowed, check the sender address that was
3763 supplied with -f. Ditto for a stripped trailing dot. */
3764
3765 if (sender_address != NULL)
3766 {
3767 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3768 {
3769 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3770 "allowed\n", sender_address);
3771 return EXIT_FAILURE;
3772 }
3773 if (f_end_dot && !strip_trailing_dot)
3774 {
3775 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3776 "(trailing dot not allowed)\n", sender_address);
3777 return EXIT_FAILURE;
3778 }
3779 }
3780
3781 /* See if an admin user overrode our logging. */
3782
3783 if (cmdline_syslog_name != NULL)
3784 {
3785 if (admin_user)
3786 {
3787 syslog_processname = cmdline_syslog_name;
3788 log_file_path = string_copy(CUS"syslog");
3789 }
3790 else
3791 {
3792 /* not a panic, non-privileged users should not be able to spam paniclog */
3793 fprintf(stderr,
3794 "exim: you lack sufficient privilege to specify syslog process name\n");
3795 return EXIT_FAILURE;
3796 }
3797 }
3798
3799 /* Paranoia check of maximum lengths of certain strings. There is a check
3800 on the length of the log file path in log.c, which will come into effect
3801 if there are any calls to write the log earlier than this. However, if we
3802 get this far but the string is very long, it is better to stop now than to
3803 carry on and (e.g.) receive a message and then have to collapse. The call to
3804 log_write() from here will cause the ultimate panic collapse if the complete
3805 file name exceeds the buffer length. */
3806
3807 if (Ustrlen(log_file_path) > 200)
3808 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3809 "log_file_path is longer than 200 chars: aborting");
3810
3811 if (Ustrlen(pid_file_path) > 200)
3812 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3813 "pid_file_path is longer than 200 chars: aborting");
3814
3815 if (Ustrlen(spool_directory) > 200)
3816 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3817 "spool_directory is longer than 200 chars: aborting");
3818
3819 /* Length check on the process name given to syslog for its TAG field,
3820 which is only permitted to be 32 characters or less. See RFC 3164. */
3821
3822 if (Ustrlen(syslog_processname) > 32)
3823 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3824 "syslog_processname is longer than 32 chars: aborting");
3825
3826 /* In some operating systems, the environment variable TMPDIR controls where
3827 temporary files are created; Exim doesn't use these (apart from when delivering
3828 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3829 If TMPDIR is found in the environment, reset it to the value defined in the
3830 TMPDIR macro, if this macro is defined. */
3831
3832 #ifdef TMPDIR
3833 {
3834 uschar **p;
3835 for (p = USS environ; *p != NULL; p++)
3836 {
3837 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3838 Ustrcmp(*p+7, TMPDIR) != 0)
3839 {
3840 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3841 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3842 *p = newp;
3843 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3844 }
3845 }
3846 }
3847 #endif
3848
3849 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3850 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3851 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3852 called by a user who has set the TZ variable. This then affects the timestamps
3853 in log files and in Received: headers, and any created Date: header lines. The
3854 required timezone is settable in the configuration file, so nothing can be done
3855 about this earlier - but hopefully nothing will normally be logged earlier than
3856 this. We have to make a new environment if TZ is wrong, but don't bother if
3857 timestamps_utc is set, because then all times are in UTC anyway. */
3858
3859 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3860 {
3861 timestamps_utc = TRUE;
3862 }
3863 else
3864 {
3865 uschar *envtz = US getenv("TZ");
3866 if ((envtz == NULL && timezone_string != NULL) ||
3867 (envtz != NULL &&
3868 (timezone_string == NULL ||
3869 Ustrcmp(timezone_string, envtz) != 0)))
3870 {
3871 uschar **p = USS environ;
3872 uschar **new;
3873 uschar **newp;
3874 int count = 0;
3875 while (*p++ != NULL) count++;
3876 if (envtz == NULL) count++;
3877 newp = new = malloc(sizeof(uschar *) * (count + 1));
3878 for (p = USS environ; *p != NULL; p++)
3879 {
3880 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3881 *newp++ = *p;
3882 }
3883 if (timezone_string != NULL)
3884 {
3885 *newp = malloc(Ustrlen(timezone_string) + 4);
3886 sprintf(CS *newp++, "TZ=%s", timezone_string);
3887 }
3888 *newp = NULL;
3889 environ = CSS new;
3890 tzset();
3891 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3892 tod_stamp(tod_log));
3893 }
3894 }
3895
3896 /* Handle the case when we have removed the setuid privilege because of -C or
3897 -D. This means that the caller of Exim was not root.
3898
3899 There is a problem if we were running as the Exim user. The sysadmin may
3900 expect this case to retain privilege because "the binary was called by the
3901 Exim user", but it hasn't, because either the -D option set macros, or the
3902 -C option set a non-trusted configuration file. There are two possibilities:
3903
3904 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3905 to do message deliveries. Thus, the fact that it is running as a
3906 non-privileged user is plausible, and might be wanted in some special
3907 configurations. However, really_exim will have been set false when
3908 privilege was dropped, to stop Exim trying to write to its normal log
3909 files. Therefore, re-enable normal log processing, assuming the sysadmin
3910 has set up the log directory correctly.
3911
3912 (2) If deliver_drop_privilege is not set, the configuration won't work as
3913 apparently intended, and so we log a panic message. In order to retain
3914 root for -C or -D, the caller must either be root or be invoking a
3915 trusted configuration file (when deliver_drop_privilege is false). */
3916
3917 if (removed_privilege && (!trusted_config || macros != NULL) &&
3918 real_uid == exim_uid)
3919 {
3920 if (deliver_drop_privilege)
3921 really_exim = TRUE; /* let logging work normally */
3922 else
3923 log_write(0, LOG_MAIN|LOG_PANIC,
3924 "exim user lost privilege for using %s option",
3925 trusted_config? "-D" : "-C");
3926 }
3927
3928 /* Start up Perl interpreter if Perl support is configured and there is a
3929 perl_startup option, and the configuration or the command line specifies
3930 initializing starting. Note that the global variables are actually called
3931 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3932
3933 #ifdef EXIM_PERL
3934 if (perl_start_option != 0)
3935 opt_perl_at_start = (perl_start_option > 0);
3936 if (opt_perl_at_start && opt_perl_startup != NULL)
3937 {
3938 uschar *errstr;
3939 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3940 errstr = init_perl(opt_perl_startup);
3941 if (errstr != NULL)
3942 {
3943 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3944 return EXIT_FAILURE;
3945 }
3946 opt_perl_started = TRUE;
3947 }
3948 #endif /* EXIM_PERL */
3949
3950 /* Log the arguments of the call if the configuration file said so. This is
3951 a debugging feature for finding out what arguments certain MUAs actually use.
3952 Don't attempt it if logging is disabled, or if listing variables or if
3953 verifying/testing addresses or expansions. */
3954
3955 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3956 && really_exim && !list_options && !checking)
3957 {
3958 int i;
3959 uschar *p = big_buffer;
3960 char * dummy;
3961 Ustrcpy(p, "cwd= (failed)");
3962 dummy = /* quieten compiler */ getcwd(CS p+4, big_buffer_size - 4);
3963 while (*p) p++;
3964 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3965 while (*p) p++;
3966 for (i = 0; i < argc; i++)
3967 {
3968 int len = Ustrlen(argv[i]);
3969 uschar *printing;
3970 uschar *quote;
3971 if (p + len + 8 >= big_buffer + big_buffer_size)
3972 {
3973 Ustrcpy(p, " ...");
3974 log_write(0, LOG_MAIN, "%s", big_buffer);
3975 Ustrcpy(big_buffer, "...");
3976 p = big_buffer + 3;
3977 }
3978 printing = string_printing(argv[i]);
3979 if (printing[0] == 0) quote = US"\""; else
3980 {
3981 uschar *pp = printing;
3982 quote = US"";
3983 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3984 }
3985 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3986 (p - big_buffer) - 4), printing, quote);
3987 while (*p) p++;
3988 }
3989
3990 if ((log_extra_selector & LX_arguments) != 0)
3991 log_write(0, LOG_MAIN, "%s", big_buffer);
3992 else
3993 debug_printf("%s\n", big_buffer);
3994 }
3995
3996 /* Set the working directory to be the top-level spool directory. We don't rely
3997 on this in the code, which always uses fully qualified names, but it's useful
3998 for core dumps etc. Don't complain if it fails - the spool directory might not
3999 be generally accessible and calls with the -C option (and others) have lost
4000 privilege by now. Before the chdir, we try to ensure that the directory exists.
4001 */
4002
4003 if (Uchdir(spool_directory) != 0)
4004 {
4005 int dummy;
4006 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4007 dummy = /* quieten compiler */ Uchdir(spool_directory);
4008 }
4009
4010 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4011 alias file. Exim doesn't have such a concept, but this call is screwed into
4012 Sun's YP makefiles. Handle this by calling a configured script, as the real
4013 user who called Exim. The -oA option can be used to pass an argument to the
4014 script. */
4015
4016 if (bi_option)
4017 {
4018 (void)fclose(config_file);
4019 if (bi_command != NULL)
4020 {
4021 int i = 0;
4022 uschar *argv[3];
4023 argv[i++] = bi_command;
4024 if (alias_arg != NULL) argv[i++] = alias_arg;
4025 argv[i++] = NULL;
4026
4027 setgroups(group_count, group_list);
4028 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4029
4030 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
4031 (argv[1] == NULL)? US"" : argv[1]);
4032
4033 execv(CS argv[0], (char *const *)argv);
4034 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
4035 exit(EXIT_FAILURE);
4036 }
4037 else
4038 {
4039 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4040 exit(EXIT_SUCCESS);
4041 }
4042 }
4043
4044 /* We moved the admin/trusted check to be immediately after reading the
4045 configuration file. We leave these prints here to ensure that syslog setup,
4046 logfile setup, and so on has already happened. */
4047
4048 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4049 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
4050
4051 /* Only an admin user may start the daemon or force a queue run in the default
4052 configuration, but the queue run restriction can be relaxed. Only an admin
4053 user may request that a message be returned to its sender forthwith. Only an
4054 admin user may specify a debug level greater than D_v (because it might show
4055 passwords, etc. in lookup queries). Only an admin user may request a queue
4056 count. Only an admin user can use the test interface to scan for email
4057 (because Exim will be in the spool dir and able to look at mails). */
4058
4059 if (!admin_user)
4060 {
4061 BOOL debugset = (debug_selector & ~D_v) != 0;
4062 if (deliver_give_up || daemon_listen || malware_test_file ||
4063 (count_queue && queue_list_requires_admin) ||
4064 (list_queue && queue_list_requires_admin) ||
4065 (queue_interval >= 0 && prod_requires_admin) ||
4066 (debugset && !running_in_test_harness))
4067 {
4068 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
4069 exit(EXIT_FAILURE);
4070 }
4071 }
4072
4073 /* If the real user is not root or the exim uid, the argument for passing
4074 in an open TCP/IP connection for another message is not permitted, nor is
4075 running with the -N option for any delivery action, unless this call to exim is
4076 one that supplied an input message, or we are using a patched exim for
4077 regression testing. */
4078
4079 if (real_uid != root_uid &&