f7f8b251aeed8b25b20c699b2fa033df72a8e142
[exim.git] / src / src / exim.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
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 #if defined(__GLIBC__) && !defined(__UCLIBC__)
16 # include <gnu/libc-version.h>
17 #endif
18
19 #ifdef USE_GNUTLS
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 # define DISABLE_OCSP
23 # endif
24 #endif
25
26 #ifndef _TIME_H
27 # include <time.h>
28 #endif
29
30 extern void init_lookup_list(void);
31
32
33
34 /*************************************************
35 * Function interface to store functions *
36 *************************************************/
37
38 /* We need some real functions to pass to the PCRE regular expression library
39 for store allocation via Exim's store manager. The normal calls are actually
40 macros that pass over location information to make tracing easier. These
41 functions just interface to the standard macro calls. A good compiler will
42 optimize out the tail recursion and so not make them too expensive. There
43 are two sets of functions; one for use when we want to retain the compiled
44 regular expression for a long time; the other for short-term use. */
45
46 static void *
47 function_store_get(size_t size)
48 {
49 /* For now, regard all RE results as potentially tainted. We might need
50 more intelligence on this point. */
51 return store_get((int)size, TRUE);
52 }
53
54 static void
55 function_dummy_free(void *block) { block = block; }
56
57 static void *
58 function_store_malloc(size_t size)
59 {
60 return store_malloc((int)size);
61 }
62
63 static void
64 function_store_free(void *block)
65 {
66 store_free(block);
67 }
68
69
70
71
72 /*************************************************
73 * Enums for cmdline interface *
74 *************************************************/
75
76 enum commandline_info { CMDINFO_NONE=0,
77 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
78
79
80
81
82 /*************************************************
83 * Compile regular expression and panic on fail *
84 *************************************************/
85
86 /* This function is called when failure to compile a regular expression leads
87 to a panic exit. In other cases, pcre_compile() is called directly. In many
88 cases where this function is used, the results of the compilation are to be
89 placed in long-lived store, so we temporarily reset the store management
90 functions that PCRE uses if the use_malloc flag is set.
91
92 Argument:
93 pattern the pattern to compile
94 caseless TRUE if caseless matching is required
95 use_malloc TRUE if compile into malloc store
96
97 Returns: pointer to the compiled pattern
98 */
99
100 const pcre *
101 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
102 {
103 int offset;
104 int options = PCRE_COPT;
105 const pcre *yield;
106 const uschar *error;
107 if (use_malloc)
108 {
109 pcre_malloc = function_store_malloc;
110 pcre_free = function_store_free;
111 }
112 if (caseless) options |= PCRE_CASELESS;
113 yield = pcre_compile(CCS pattern, options, CCSS &error, &offset, NULL);
114 pcre_malloc = function_store_get;
115 pcre_free = function_dummy_free;
116 if (yield == NULL)
117 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
118 "%s at offset %d while compiling %s", error, offset, pattern);
119 return yield;
120 }
121
122
123
124
125 /*************************************************
126 * Execute regular expression and set strings *
127 *************************************************/
128
129 /* This function runs a regular expression match, and sets up the pointers to
130 the matched substrings.
131
132 Arguments:
133 re the compiled expression
134 subject the subject string
135 options additional PCRE options
136 setup if < 0 do full setup
137 if >= 0 setup from setup+1 onwards,
138 excluding the full matched string
139
140 Returns: TRUE or FALSE
141 */
142
143 BOOL
144 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
145 {
146 int ovector[3*(EXPAND_MAXN+1)];
147 uschar * s = string_copy(subject); /* de-constifying */
148 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
149 PCRE_EOPT | options, ovector, nelem(ovector));
150 BOOL yield = n >= 0;
151 if (n == 0) n = EXPAND_MAXN + 1;
152 if (yield)
153 {
154 expand_nmax = setup < 0 ? 0 : setup + 1;
155 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
156 {
157 expand_nstring[expand_nmax] = s + ovector[nn];
158 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
159 }
160 expand_nmax--;
161 }
162 return yield;
163 }
164
165
166
167
168 /*************************************************
169 * Set up processing details *
170 *************************************************/
171
172 /* Save a text string for dumping when SIGUSR1 is received.
173 Do checks for overruns.
174
175 Arguments: format and arguments, as for printf()
176 Returns: nothing
177 */
178
179 void
180 set_process_info(const char *format, ...)
181 {
182 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
183 gstring * g;
184 int len;
185 va_list ap;
186
187 g = string_fmt_append(&gs, "%5d ", (int)getpid());
188 len = g->ptr;
189 va_start(ap, format);
190 if (!string_vformat(g, 0, format, ap))
191 {
192 gs.ptr = len;
193 g = string_cat(&gs, US"**** string overflowed buffer ****");
194 }
195 g = string_catn(g, US"\n", 1);
196 string_from_gstring(g);
197 process_info_len = g->ptr;
198 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
199 va_end(ap);
200 }
201
202 /***********************************************
203 * Handler for SIGTERM *
204 ***********************************************/
205
206 static void
207 term_handler(int sig)
208 {
209 exit(1);
210 }
211
212
213 /*************************************************
214 * Handler for SIGUSR1 *
215 *************************************************/
216
217 /* SIGUSR1 causes any exim process to write to the process log details of
218 what it is currently doing. It will only be used if the OS is capable of
219 setting up a handler that causes automatic restarting of any system call
220 that is in progress at the time.
221
222 This function takes care to be signal-safe.
223
224 Argument: the signal number (SIGUSR1)
225 Returns: nothing
226 */
227
228 static void
229 usr1_handler(int sig)
230 {
231 int fd;
232
233 os_restarting_signal(sig, usr1_handler);
234
235 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
236 {
237 /* If we are already running as the Exim user, try to create it in the
238 current process (assuming spool_directory exists). Otherwise, if we are
239 root, do the creation in an exim:exim subprocess. */
240
241 int euid = geteuid();
242 if (euid == exim_uid)
243 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
244 else if (euid == root_uid)
245 fd = log_create_as_exim(process_log_path);
246 }
247
248 /* If we are neither exim nor root, or if we failed to create the log file,
249 give up. There is not much useful we can do with errors, since we don't want
250 to disrupt whatever is going on outside the signal handler. */
251
252 if (fd < 0) return;
253
254 (void)write(fd, process_info, process_info_len);
255 (void)close(fd);
256 }
257
258
259
260 /*************************************************
261 * Timeout handler *
262 *************************************************/
263
264 /* This handler is enabled most of the time that Exim is running. The handler
265 doesn't actually get used unless alarm() has been called to set a timer, to
266 place a time limit on a system call of some kind. When the handler is run, it
267 re-enables itself.
268
269 There are some other SIGALRM handlers that are used in special cases when more
270 than just a flag setting is required; for example, when reading a message's
271 input. These are normally set up in the code module that uses them, and the
272 SIGALRM handler is reset to this one afterwards.
273
274 Argument: the signal value (SIGALRM)
275 Returns: nothing
276 */
277
278 void
279 sigalrm_handler(int sig)
280 {
281 sig = sig; /* Keep picky compilers happy */
282 sigalrm_seen = TRUE;
283 os_non_restarting_signal(SIGALRM, sigalrm_handler);
284 }
285
286
287
288 /*************************************************
289 * Sleep for a fractional time interval *
290 *************************************************/
291
292 /* This function is called by millisleep() and exim_wait_tick() to wait for a
293 period of time that may include a fraction of a second. The coding is somewhat
294 tedious. We do not expect setitimer() ever to fail, but if it does, the process
295 will wait for ever, so we panic in this instance. (There was a case of this
296 when a bug in a function that calls milliwait() caused it to pass invalid data.
297 That's when I added the check. :-)
298
299 We assume it to be not worth sleeping for under 50us; this value will
300 require revisiting as hardware advances. This avoids the issue of
301 a zero-valued timer setting meaning "never fire".
302
303 Argument: an itimerval structure containing the interval
304 Returns: nothing
305 */
306
307 static void
308 milliwait(struct itimerval *itval)
309 {
310 sigset_t sigmask;
311 sigset_t old_sigmask;
312
313 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
314 return;
315 (void)sigemptyset(&sigmask); /* Empty mask */
316 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
317 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
318 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
319 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
320 "setitimer() failed: %s", strerror(errno));
321 (void)sigfillset(&sigmask); /* All signals */
322 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
323 (void)sigsuspend(&sigmask); /* Until SIGALRM */
324 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
325 }
326
327
328
329
330 /*************************************************
331 * Millisecond sleep function *
332 *************************************************/
333
334 /* The basic sleep() function has a granularity of 1 second, which is too rough
335 in some cases - for example, when using an increasing delay to slow down
336 spammers.
337
338 Argument: number of millseconds
339 Returns: nothing
340 */
341
342 void
343 millisleep(int msec)
344 {
345 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
346 .it_value = {.tv_sec = msec/1000,
347 .tv_usec = (msec % 1000) * 1000}};
348 milliwait(&itval);
349 }
350
351
352
353 /*************************************************
354 * Compare microsecond times *
355 *************************************************/
356
357 /*
358 Arguments:
359 tv1 the first time
360 tv2 the second time
361
362 Returns: -1, 0, or +1
363 */
364
365 static int
366 exim_tvcmp(struct timeval *t1, struct timeval *t2)
367 {
368 if (t1->tv_sec > t2->tv_sec) return +1;
369 if (t1->tv_sec < t2->tv_sec) return -1;
370 if (t1->tv_usec > t2->tv_usec) return +1;
371 if (t1->tv_usec < t2->tv_usec) return -1;
372 return 0;
373 }
374
375
376
377
378 /*************************************************
379 * Clock tick wait function *
380 *************************************************/
381
382 #ifdef _POSIX_MONOTONIC_CLOCK
383 /* Amount CLOCK_MONOTONIC is behind realtime, at startup. */
384 static struct timespec offset_ts;
385
386 static void
387 exim_clock_init(void)
388 {
389 struct timeval tv;
390 if (clock_gettime(CLOCK_MONOTONIC, &offset_ts) != 0) return;
391 (void)gettimeofday(&tv, NULL);
392 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
393 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
394 if (offset_ts.tv_nsec >= 0) return;
395 offset_ts.tv_sec--;
396 offset_ts.tv_nsec += 1000*1000*1000;
397 }
398 #endif
399
400
401 /* Exim uses a time + a pid to generate a unique identifier in two places: its
402 message IDs, and in file names for maildir deliveries. Because some OS now
403 re-use pids within the same second, sub-second times are now being used.
404 However, for absolute certainty, we must ensure the clock has ticked before
405 allowing the relevant process to complete. At the time of implementation of
406 this code (February 2003), the speed of processors is such that the clock will
407 invariably have ticked already by the time a process has done its job. This
408 function prepares for the time when things are faster - and it also copes with
409 clocks that go backwards.
410
411 Arguments:
412 tgt_tv A timeval which was used to create uniqueness; its usec field
413 has been rounded down to the value of the resolution.
414 We want to be sure the current time is greater than this.
415 resolution The resolution that was used to divide the microseconds
416 (1 for maildir, larger for message ids)
417
418 Returns: nothing
419 */
420
421 void
422 exim_wait_tick(struct timeval * tgt_tv, int resolution)
423 {
424 struct timeval now_tv;
425 long int now_true_usec;
426
427 #ifdef _POSIX_MONOTONIC_CLOCK
428 struct timespec now_ts;
429
430 if (clock_gettime(CLOCK_MONOTONIC, &now_ts) == 0)
431 {
432 now_ts.tv_sec += offset_ts.tv_sec;
433 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
434 {
435 now_ts.tv_sec++;
436 now_ts.tv_nsec -= 1000*1000*1000;
437 }
438 now_tv.tv_sec = now_ts.tv_sec;
439 now_true_usec = (now_ts.tv_nsec / (resolution * 1000)) * resolution;
440 now_tv.tv_usec = now_true_usec;
441 }
442 else
443 #endif
444 {
445 (void)gettimeofday(&now_tv, NULL);
446 now_true_usec = now_tv.tv_usec;
447 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
448 }
449
450 while (exim_tvcmp(&now_tv, tgt_tv) <= 0)
451 {
452 struct itimerval itval;
453 itval.it_interval.tv_sec = 0;
454 itval.it_interval.tv_usec = 0;
455 itval.it_value.tv_sec = tgt_tv->tv_sec - now_tv.tv_sec;
456 itval.it_value.tv_usec = tgt_tv->tv_usec + resolution - now_true_usec;
457
458 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
459 negative value for the microseconds is possible only in the case when "now"
460 is more than a second less than "tgt". That means that itval.it_value.tv_sec
461 is greater than zero. The following correction is therefore safe. */
462
463 if (itval.it_value.tv_usec < 0)
464 {
465 itval.it_value.tv_usec += 1000000;
466 itval.it_value.tv_sec -= 1;
467 }
468
469 DEBUG(D_transport|D_receive)
470 {
471 if (!f.running_in_test_harness)
472 {
473 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
474 tgt_tv->tv_sec, (long) tgt_tv->tv_usec,
475 now_tv.tv_sec, (long) now_tv.tv_usec);
476 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
477 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
478 }
479 }
480
481 milliwait(&itval);
482
483 /* Be prapared to go around if the kernel does not implement subtick
484 granularity (GNU Hurd) */
485
486 (void)gettimeofday(&now_tv, NULL);
487 now_true_usec = now_tv.tv_usec;
488 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
489 }
490 }
491
492
493
494
495 /*************************************************
496 * Call fopen() with umask 777 and adjust mode *
497 *************************************************/
498
499 /* Exim runs with umask(0) so that files created with open() have the mode that
500 is specified in the open() call. However, there are some files, typically in
501 the spool directory, that are created with fopen(). They end up world-writeable
502 if no precautions are taken. Although the spool directory is not accessible to
503 the world, this is an untidiness. So this is a wrapper function for fopen()
504 that sorts out the mode of the created file.
505
506 Arguments:
507 filename the file name
508 options the fopen() options
509 mode the required mode
510
511 Returns: the fopened FILE or NULL
512 */
513
514 FILE *
515 modefopen(const uschar *filename, const char *options, mode_t mode)
516 {
517 mode_t saved_umask = umask(0777);
518 FILE *f = Ufopen(filename, options);
519 (void)umask(saved_umask);
520 if (f != NULL) (void)fchmod(fileno(f), mode);
521 return f;
522 }
523
524
525 /*************************************************
526 * Ensure stdin, stdout, and stderr exist *
527 *************************************************/
528
529 /* Some operating systems grumble if an exec() happens without a standard
530 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
531 file will be opened and will use these fd values, and then some other bit of
532 code will assume, for example, that it can write error messages to stderr.
533 This function ensures that fds 0, 1, and 2 are open if they do not already
534 exist, by connecting them to /dev/null.
535
536 This function is also used to ensure that std{in,out,err} exist at all times,
537 so that if any library that Exim calls tries to use them, it doesn't crash.
538
539 Arguments: None
540 Returns: Nothing
541 */
542
543 void
544 exim_nullstd(void)
545 {
546 int devnull = -1;
547 struct stat statbuf;
548 for (int i = 0; i <= 2; i++)
549 {
550 if (fstat(i, &statbuf) < 0 && errno == EBADF)
551 {
552 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
553 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
554 string_open_failed(errno, "/dev/null", NULL));
555 if (devnull != i) (void)dup2(devnull, i);
556 }
557 }
558 if (devnull > 2) (void)close(devnull);
559 }
560
561
562
563
564 /*************************************************
565 * Close unwanted file descriptors for delivery *
566 *************************************************/
567
568 /* This function is called from a new process that has been forked to deliver
569 an incoming message, either directly, or using exec.
570
571 We want any smtp input streams to be closed in this new process. However, it
572 has been observed that using fclose() here causes trouble. When reading in -bS
573 input, duplicate copies of messages have been seen. The files will be sharing a
574 file pointer with the parent process, and it seems that fclose() (at least on
575 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
576 least sometimes. Hence we go for closing the underlying file descriptors.
577
578 If TLS is active, we want to shut down the TLS library, but without molesting
579 the parent's SSL connection.
580
581 For delivery of a non-SMTP message, we want to close stdin and stdout (and
582 stderr unless debugging) because the calling process might have set them up as
583 pipes and be waiting for them to close before it waits for the submission
584 process to terminate. If they aren't closed, they hold up the calling process
585 until the initial delivery process finishes, which is not what we want.
586
587 Exception: We do want it for synchronous delivery!
588
589 And notwithstanding all the above, if D_resolver is set, implying resolver
590 debugging, leave stdout open, because that's where the resolver writes its
591 debugging output.
592
593 When we close stderr (which implies we've also closed stdout), we also get rid
594 of any controlling terminal.
595
596 Arguments: None
597 Returns: Nothing
598 */
599
600 static void
601 close_unwanted(void)
602 {
603 if (smtp_input)
604 {
605 #ifndef DISABLE_TLS
606 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
607 #endif
608 (void)close(fileno(smtp_in));
609 (void)close(fileno(smtp_out));
610 smtp_in = NULL;
611 }
612 else
613 {
614 (void)close(0); /* stdin */
615 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
616 if (debug_selector == 0) /* stderr */
617 {
618 if (!f.synchronous_delivery)
619 {
620 (void)close(2);
621 log_stderr = NULL;
622 }
623 (void)setsid();
624 }
625 }
626 }
627
628
629
630
631 /*************************************************
632 * Set uid and gid *
633 *************************************************/
634
635 /* This function sets a new uid and gid permanently, optionally calling
636 initgroups() to set auxiliary groups. There are some special cases when running
637 Exim in unprivileged modes. In these situations the effective uid will not be
638 root; if we already have the right effective uid/gid, and don't need to
639 initialize any groups, leave things as they are.
640
641 Arguments:
642 uid the uid
643 gid the gid
644 igflag TRUE if initgroups() wanted
645 msg text to use in debugging output and failure log
646
647 Returns: nothing; bombs out on failure
648 */
649
650 void
651 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
652 {
653 uid_t euid = geteuid();
654 gid_t egid = getegid();
655
656 if (euid == root_uid || euid != uid || egid != gid || igflag)
657 {
658 /* At least one OS returns +1 for initgroups failure, so just check for
659 non-zero. */
660
661 if (igflag)
662 {
663 struct passwd *pw = getpwuid(uid);
664 if (!pw)
665 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
666 "no passwd entry for uid=%ld", (long int)uid);
667
668 if (initgroups(pw->pw_name, gid) != 0)
669 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
670 (long int)uid, strerror(errno));
671 }
672
673 if (setgid(gid) < 0 || setuid(uid) < 0)
674 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
675 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
676 }
677
678 /* Debugging output included uid/gid and all groups */
679
680 DEBUG(D_uid)
681 {
682 int group_count, save_errno;
683 gid_t group_list[EXIM_GROUPLIST_SIZE];
684 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
685 (long int)geteuid(), (long int)getegid(), (long int)getpid());
686 group_count = getgroups(nelem(group_list), group_list);
687 save_errno = errno;
688 debug_printf(" auxiliary group list:");
689 if (group_count > 0)
690 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
691 else if (group_count < 0)
692 debug_printf(" <error: %s>", strerror(save_errno));
693 else debug_printf(" <none>");
694 debug_printf("\n");
695 }
696 }
697
698
699
700
701 /*************************************************
702 * Exit point *
703 *************************************************/
704
705 /* Exim exits via this function so that it always clears up any open
706 databases.
707
708 Arguments:
709 rc return code
710
711 Returns: does not return
712 */
713
714 void
715 exim_exit(int rc, const uschar * process)
716 {
717 search_tidyup();
718 store_exit();
719 DEBUG(D_any)
720 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
721 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
722 process ? "(" : "", process, process ? ") " : "", rc);
723 exit(rc);
724 }
725
726
727 void
728 exim_underbar_exit(int rc, const uschar * process)
729 {
730 store_exit();
731 DEBUG(D_any)
732 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d %s%s%sterminating with rc=%d "
733 ">>>>>>>>>>>>>>>>\n", (int)getpid(),
734 process ? "(" : "", process, process ? ") " : "", rc);
735 _exit(rc);
736 }
737
738
739
740 /* Print error string, then die */
741 static void
742 exim_fail(const char * fmt, ...)
743 {
744 va_list ap;
745 va_start(ap, fmt);
746 vfprintf(stderr, fmt, ap);
747 exit(EXIT_FAILURE);
748 }
749
750 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
751 of chown()/fchown(). See src/functions.h for more explanation */
752 int
753 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
754 {
755 int saved_errno = errno; /* from the preceeding chown call */
756 #if 1
757 log_write(0, LOG_MAIN|LOG_PANIC,
758 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
759 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
760 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
761 #else
762 /* I leave this here, commented, in case the "bug"(?) comes up again.
763 It is not an Exim bug, but we can provide a workaround.
764 See Bug 2391
765 HS 2019-04-18 */
766
767 struct stat buf;
768
769 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
770 {
771 if (buf.st_uid == owner && buf.st_gid == group) return 0;
772 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
773 }
774 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
775
776 #endif
777 errno = saved_errno;
778 return -1;
779 }
780
781
782 /*************************************************
783 * Extract port from host address *
784 *************************************************/
785
786 /* Called to extract the port from the values given to -oMa and -oMi.
787 It also checks the syntax of the address, and terminates it before the
788 port data when a port is extracted.
789
790 Argument:
791 address the address, with possible port on the end
792
793 Returns: the port, or zero if there isn't one
794 bombs out on a syntax error
795 */
796
797 static int
798 check_port(uschar *address)
799 {
800 int port = host_address_extract_port(address);
801 if (string_is_ip_address(address, NULL) == 0)
802 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
803 return port;
804 }
805
806
807
808 /*************************************************
809 * Test/verify an address *
810 *************************************************/
811
812 /* This function is called by the -bv and -bt code. It extracts a working
813 address from a full RFC 822 address. This isn't really necessary per se, but it
814 has the effect of collapsing source routes.
815
816 Arguments:
817 s the address string
818 flags flag bits for verify_address()
819 exit_value to be set for failures
820
821 Returns: nothing
822 */
823
824 static void
825 test_address(uschar *s, int flags, int *exit_value)
826 {
827 int start, end, domain;
828 uschar *parse_error = NULL;
829 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
830 FALSE);
831 if (address == NULL)
832 {
833 fprintf(stdout, "syntax error: %s\n", parse_error);
834 *exit_value = 2;
835 }
836 else
837 {
838 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
839 -1, -1, NULL, NULL, NULL);
840 if (rc == FAIL) *exit_value = 2;
841 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
842 }
843 }
844
845
846
847 /*************************************************
848 * Show supported features *
849 *************************************************/
850
851 static void
852 show_db_version(FILE * f)
853 {
854 #ifdef DB_VERSION_STRING
855 DEBUG(D_any)
856 {
857 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
858 fprintf(f, " Runtime: %s\n",
859 db_version(NULL, NULL, NULL));
860 }
861 else
862 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
863
864 #elif defined(BTREEVERSION) && defined(HASHVERSION)
865 #ifdef USE_DB
866 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
867 #else
868 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
869 #endif
870
871 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
872 fprintf(f, "Probably ndbm\n");
873 #elif defined(USE_TDB)
874 fprintf(f, "Using tdb\n");
875 #else
876 #ifdef USE_GDBM
877 fprintf(f, "Probably GDBM (native mode)\n");
878 #else
879 fprintf(f, "Probably GDBM (compatibility mode)\n");
880 #endif
881 #endif
882 }
883
884
885 /* This function is called for -bV/--version and for -d to output the optional
886 features of the current Exim binary.
887
888 Arguments: a FILE for printing
889 Returns: nothing
890 */
891
892 static void
893 show_whats_supported(FILE * fp)
894 {
895 DEBUG(D_any) {} else show_db_version(fp);
896
897 fprintf(fp, "Support for:");
898 #ifdef SUPPORT_CRYPTEQ
899 fprintf(fp, " crypteq");
900 #endif
901 #if HAVE_ICONV
902 fprintf(fp, " iconv()");
903 #endif
904 #if HAVE_IPV6
905 fprintf(fp, " IPv6");
906 #endif
907 #ifdef HAVE_SETCLASSRESOURCES
908 fprintf(fp, " use_setclassresources");
909 #endif
910 #ifdef SUPPORT_PAM
911 fprintf(fp, " PAM");
912 #endif
913 #ifdef EXIM_PERL
914 fprintf(fp, " Perl");
915 #endif
916 #ifdef EXPAND_DLFUNC
917 fprintf(fp, " Expand_dlfunc");
918 #endif
919 #ifdef USE_TCP_WRAPPERS
920 fprintf(fp, " TCPwrappers");
921 #endif
922 #ifdef USE_GNUTLS
923 fprintf(fp, " GnuTLS");
924 #endif
925 #ifdef USE_OPENSSL
926 fprintf(fp, " OpenSSL");
927 #endif
928 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
929 fprintf(fp, " translate_ip_address");
930 #endif
931 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
932 fprintf(fp, " move_frozen_messages");
933 #endif
934 #ifdef WITH_CONTENT_SCAN
935 fprintf(fp, " Content_Scanning");
936 #endif
937 #ifdef SUPPORT_DANE
938 fprintf(fp, " DANE");
939 #endif
940 #ifndef DISABLE_DKIM
941 fprintf(fp, " DKIM");
942 #endif
943 #ifndef DISABLE_DNSSEC
944 fprintf(fp, " DNSSEC");
945 #endif
946 #ifndef DISABLE_EVENT
947 fprintf(fp, " Event");
948 #endif
949 #ifdef SUPPORT_I18N
950 fprintf(fp, " I18N");
951 #endif
952 #ifndef DISABLE_OCSP
953 fprintf(fp, " OCSP");
954 #endif
955 #ifndef DISABLE_PIPE_CONNECT
956 fprintf(fp, " PIPE_CONNECT");
957 #endif
958 #ifndef DISABLE_PRDR
959 fprintf(fp, " PRDR");
960 #endif
961 #ifdef SUPPORT_PROXY
962 fprintf(fp, " PROXY");
963 #endif
964 #ifdef SUPPORT_SOCKS
965 fprintf(fp, " SOCKS");
966 #endif
967 #ifdef SUPPORT_SPF
968 fprintf(fp, " SPF");
969 #endif
970 #ifdef SUPPORT_DMARC
971 fprintf(fp, " DMARC");
972 #endif
973 #ifdef TCP_FASTOPEN
974 tcp_init();
975 if (f.tcp_fastopen_ok) fprintf(fp, " TCP_Fast_Open");
976 #endif
977 #ifdef EXPERIMENTAL_ARC
978 fprintf(fp, " Experimental_ARC");
979 #endif
980 #ifdef EXPERIMENTAL_BRIGHTMAIL
981 fprintf(fp, " Experimental_Brightmail");
982 #endif
983 #ifdef EXPERIMENTAL_DCC
984 fprintf(fp, " Experimental_DCC");
985 #endif
986 #ifdef EXPERIMENTAL_DSN_INFO
987 fprintf(fp, " Experimental_DSN_info");
988 #endif
989 #ifdef EXPERIMENTAL_LMDB
990 fprintf(fp, " Experimental_LMDB");
991 #endif
992 #ifdef EXPERIMENTAL_QUEUE_RAMP
993 fprintf(fp, " Experimental_Queue_Ramp");
994 #endif
995 #ifdef EXPERIMENTAL_QUEUEFILE
996 fprintf(fp, " Experimental_QUEUEFILE");
997 #endif
998 #if defined(EXPERIMENTAL_SRS) || defined(EXPERIMENTAL_SRS_NATIVE)
999 fprintf(fp, " Experimental_SRS");
1000 #endif
1001 #ifdef EXPERIMENTAL_TLS_RESUME
1002 fprintf(fp, " Experimental_TLS_resume");
1003 #endif
1004 fprintf(fp, "\n");
1005
1006 fprintf(fp, "Lookups (built-in):");
1007 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1008 fprintf(fp, " lsearch wildlsearch nwildlsearch iplsearch");
1009 #endif
1010 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1011 fprintf(fp, " cdb");
1012 #endif
1013 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1014 fprintf(fp, " dbm dbmjz dbmnz");
1015 #endif
1016 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1017 fprintf(fp, " dnsdb");
1018 #endif
1019 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1020 fprintf(fp, " dsearch");
1021 #endif
1022 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1023 fprintf(fp, " ibase");
1024 #endif
1025 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1026 fprintf(fp, " json");
1027 #endif
1028 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1029 fprintf(fp, " ldap ldapdn ldapm");
1030 #endif
1031 #ifdef EXPERIMENTAL_LMDB
1032 fprintf(fp, " lmdb");
1033 #endif
1034 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1035 fprintf(fp, " mysql");
1036 #endif
1037 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1038 fprintf(fp, " nis nis0");
1039 #endif
1040 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1041 fprintf(fp, " nisplus");
1042 #endif
1043 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1044 fprintf(fp, " oracle");
1045 #endif
1046 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1047 fprintf(fp, " passwd");
1048 #endif
1049 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1050 fprintf(fp, " pgsql");
1051 #endif
1052 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1053 fprintf(fp, " redis");
1054 #endif
1055 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1056 fprintf(fp, " sqlite");
1057 #endif
1058 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1059 fprintf(fp, " testdb");
1060 #endif
1061 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1062 fprintf(fp, " whoson");
1063 #endif
1064 fprintf(fp, "\n");
1065
1066 auth_show_supported(fp);
1067 route_show_supported(fp);
1068 transport_show_supported(fp);
1069
1070 #ifdef WITH_CONTENT_SCAN
1071 malware_show_supported(fp);
1072 #endif
1073
1074 if (fixed_never_users[0] > 0)
1075 {
1076 int i;
1077 fprintf(fp, "Fixed never_users: ");
1078 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1079 fprintf(fp, "%d:", (unsigned int)fixed_never_users[i]);
1080 fprintf(fp, "%d\n", (unsigned int)fixed_never_users[i]);
1081 }
1082
1083 fprintf(fp, "Configure owner: %d:%d\n", config_uid, config_gid);
1084
1085 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1086
1087 /* Everything else is details which are only worth reporting when debugging.
1088 Perhaps the tls_version_report should move into this too. */
1089 DEBUG(D_any) do {
1090
1091 /* clang defines __GNUC__ (at least, for me) so test for it first */
1092 #if defined(__clang__)
1093 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1094 #elif defined(__GNUC__)
1095 fprintf(fp, "Compiler: GCC [%s]\n",
1096 # ifdef __VERSION__
1097 __VERSION__
1098 # else
1099 "? unknown version ?"
1100 # endif
1101 );
1102 #else
1103 fprintf(fp, "Compiler: <unknown>\n");
1104 #endif
1105
1106 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1107 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1108 __GLIBC__, __GLIBC_MINOR__);
1109 if (__GLIBC_PREREQ(2, 1))
1110 fprintf(fp, " Runtime: %s\n",
1111 gnu_get_libc_version());
1112 #endif
1113
1114 show_db_version(fp);
1115
1116 #ifndef DISABLE_TLS
1117 tls_version_report(fp);
1118 #endif
1119 #ifdef SUPPORT_I18N
1120 utf8_version_report(fp);
1121 #endif
1122 #ifdef SUPPORT_SPF
1123 spf_lib_version_report(fp);
1124 #endif
1125
1126 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1127 if (authi->version_report)
1128 (*authi->version_report)(fp);
1129
1130 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1131 characters; unless it's an ancient version of PCRE in which case it
1132 is not defined. */
1133 #ifndef PCRE_PRERELEASE
1134 # define PCRE_PRERELEASE
1135 #endif
1136 #define QUOTE(X) #X
1137 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1138 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1139 " Runtime: %s\n",
1140 PCRE_MAJOR, PCRE_MINOR,
1141 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1142 pcre_version());
1143 #undef QUOTE
1144 #undef EXPAND_AND_QUOTE
1145
1146 init_lookup_list();
1147 for (int i = 0; i < lookup_list_count; i++)
1148 if (lookup_list[i]->version_report)
1149 lookup_list[i]->version_report(fp);
1150
1151 #ifdef WHITELIST_D_MACROS
1152 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1153 #else
1154 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1155 #endif
1156 #ifdef TRUSTED_CONFIG_LIST
1157 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1158 #else
1159 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1160 #endif
1161
1162 } while (0);
1163 }
1164
1165
1166 /*************************************************
1167 * Show auxiliary information about Exim *
1168 *************************************************/
1169
1170 static void
1171 show_exim_information(enum commandline_info request, FILE *stream)
1172 {
1173 switch(request)
1174 {
1175 case CMDINFO_NONE:
1176 fprintf(stream, "Oops, something went wrong.\n");
1177 return;
1178 case CMDINFO_HELP:
1179 fprintf(stream,
1180 "The -bI: flag takes a string indicating which information to provide.\n"
1181 "If the string is not recognised, you'll get this help (on stderr).\n"
1182 "\n"
1183 " exim -bI:help this information\n"
1184 " exim -bI:dscp list of known dscp value keywords\n"
1185 " exim -bI:sieve list of supported sieve extensions\n"
1186 );
1187 return;
1188 case CMDINFO_SIEVE:
1189 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1190 fprintf(stream, "%s\n", *pp);
1191 return;
1192 case CMDINFO_DSCP:
1193 dscp_list_to_stream(stream);
1194 return;
1195 }
1196 }
1197
1198
1199 /*************************************************
1200 * Quote a local part *
1201 *************************************************/
1202
1203 /* This function is used when a sender address or a From: or Sender: header
1204 line is being created from the caller's login, or from an authenticated_id. It
1205 applies appropriate quoting rules for a local part.
1206
1207 Argument: the local part
1208 Returns: the local part, quoted if necessary
1209 */
1210
1211 uschar *
1212 local_part_quote(uschar *lpart)
1213 {
1214 BOOL needs_quote = FALSE;
1215 gstring * g;
1216
1217 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1218 {
1219 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1220 (*t != '.' || t == lpart || t[1] == 0);
1221 }
1222
1223 if (!needs_quote) return lpart;
1224
1225 g = string_catn(NULL, US"\"", 1);
1226
1227 for (;;)
1228 {
1229 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1230 if (nq == NULL)
1231 {
1232 g = string_cat(g, lpart);
1233 break;
1234 }
1235 g = string_catn(g, lpart, nq - lpart);
1236 g = string_catn(g, US"\\", 1);
1237 g = string_catn(g, nq, 1);
1238 lpart = nq + 1;
1239 }
1240
1241 g = string_catn(g, US"\"", 1);
1242 return string_from_gstring(g);
1243 }
1244
1245
1246
1247 #ifdef USE_READLINE
1248 /*************************************************
1249 * Load readline() functions *
1250 *************************************************/
1251
1252 /* This function is called from testing executions that read data from stdin,
1253 but only when running as the calling user. Currently, only -be does this. The
1254 function loads the readline() function library and passes back the functions.
1255 On some systems, it needs the curses library, so load that too, but try without
1256 it if loading fails. All this functionality has to be requested at build time.
1257
1258 Arguments:
1259 fn_readline_ptr pointer to where to put the readline pointer
1260 fn_addhist_ptr pointer to where to put the addhistory function
1261
1262 Returns: the dlopen handle or NULL on failure
1263 */
1264
1265 static void *
1266 set_readline(char * (**fn_readline_ptr)(const char *),
1267 void (**fn_addhist_ptr)(const char *))
1268 {
1269 void *dlhandle;
1270 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1271
1272 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1273 if (dlhandle_curses) dlclose(dlhandle_curses);
1274
1275 if (dlhandle)
1276 {
1277 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1278 * char * readline (const char *prompt);
1279 * void add_history (const char *string);
1280 */
1281 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1282 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1283 }
1284 else
1285 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1286
1287 return dlhandle;
1288 }
1289 #endif
1290
1291
1292
1293 /*************************************************
1294 * Get a line from stdin for testing things *
1295 *************************************************/
1296
1297 /* This function is called when running tests that can take a number of lines
1298 of input (for example, -be and -bt). It handles continuations and trailing
1299 spaces. And prompting and a blank line output on eof. If readline() is in use,
1300 the arguments are non-NULL and provide the relevant functions.
1301
1302 Arguments:
1303 fn_readline readline function or NULL
1304 fn_addhist addhist function or NULL
1305
1306 Returns: pointer to dynamic memory, or NULL at end of file
1307 */
1308
1309 static uschar *
1310 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1311 {
1312 gstring * g = NULL;
1313
1314 if (!fn_readline) { printf("> "); fflush(stdout); }
1315
1316 for (int i = 0;; i++)
1317 {
1318 uschar buffer[1024];
1319 uschar *p, *ss;
1320
1321 #ifdef USE_READLINE
1322 char *readline_line = NULL;
1323 if (fn_readline)
1324 {
1325 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1326 if (*readline_line != 0 && fn_addhist) fn_addhist(readline_line);
1327 p = US readline_line;
1328 }
1329 else
1330 #endif
1331
1332 /* readline() not in use */
1333
1334 {
1335 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1336 p = buffer;
1337 }
1338
1339 /* Handle the line */
1340
1341 ss = p + (int)Ustrlen(p);
1342 while (ss > p && isspace(ss[-1])) ss--;
1343
1344 if (i > 0)
1345 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1346
1347 g = string_catn(g, p, ss - p);
1348
1349 #ifdef USE_READLINE
1350 if (fn_readline) free(readline_line);
1351 #endif
1352
1353 /* g can only be NULL if ss==p */
1354 if (ss == p || g->s[g->ptr-1] != '\\')
1355 break;
1356
1357 --g->ptr;
1358 (void) string_from_gstring(g);
1359 }
1360
1361 if (!g) printf("\n");
1362 return string_from_gstring(g);
1363 }
1364
1365
1366
1367 /*************************************************
1368 * Output usage information for the program *
1369 *************************************************/
1370
1371 /* This function is called when there are no recipients
1372 or a specific --help argument was added.
1373
1374 Arguments:
1375 progname information on what name we were called by
1376
1377 Returns: DOES NOT RETURN
1378 */
1379
1380 static void
1381 exim_usage(uschar *progname)
1382 {
1383
1384 /* Handle specific program invocation variants */
1385 if (Ustrcmp(progname, US"-mailq") == 0)
1386 exim_fail(
1387 "mailq - list the contents of the mail queue\n\n"
1388 "For a list of options, see the Exim documentation.\n");
1389
1390 /* Generic usage - we output this whatever happens */
1391 exim_fail(
1392 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1393 "not directly from a shell command line. Options and/or arguments control\n"
1394 "what it does when called. For a list of options, see the Exim documentation.\n");
1395 }
1396
1397
1398
1399 /*************************************************
1400 * Validate that the macros given are okay *
1401 *************************************************/
1402
1403 /* Typically, Exim will drop privileges if macros are supplied. In some
1404 cases, we want to not do so.
1405
1406 Arguments: opt_D_used - true if the commandline had a "-D" option
1407 Returns: true if trusted, false otherwise
1408 */
1409
1410 static BOOL
1411 macros_trusted(BOOL opt_D_used)
1412 {
1413 #ifdef WHITELIST_D_MACROS
1414 uschar *whitelisted, *end, *p, **whites;
1415 int white_count, i, n;
1416 size_t len;
1417 BOOL prev_char_item, found;
1418 #endif
1419
1420 if (!opt_D_used)
1421 return TRUE;
1422 #ifndef WHITELIST_D_MACROS
1423 return FALSE;
1424 #else
1425
1426 /* We only trust -D overrides for some invoking users:
1427 root, the exim run-time user, the optional config owner user.
1428 I don't know why config-owner would be needed, but since they can own the
1429 config files anyway, there's no security risk to letting them override -D. */
1430 if ( ! ((real_uid == root_uid)
1431 || (real_uid == exim_uid)
1432 #ifdef CONFIGURE_OWNER
1433 || (real_uid == config_uid)
1434 #endif
1435 ))
1436 {
1437 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1438 return FALSE;
1439 }
1440
1441 /* Get a list of macros which are whitelisted */
1442 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1443 prev_char_item = FALSE;
1444 white_count = 0;
1445 for (p = whitelisted; *p != '\0'; ++p)
1446 {
1447 if (*p == ':' || isspace(*p))
1448 {
1449 *p = '\0';
1450 if (prev_char_item)
1451 ++white_count;
1452 prev_char_item = FALSE;
1453 continue;
1454 }
1455 if (!prev_char_item)
1456 prev_char_item = TRUE;
1457 }
1458 end = p;
1459 if (prev_char_item)
1460 ++white_count;
1461 if (!white_count)
1462 return FALSE;
1463 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1464 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1465 {
1466 if (*p != '\0')
1467 {
1468 whites[i++] = p;
1469 if (i == white_count)
1470 break;
1471 while (*p != '\0' && p < end)
1472 ++p;
1473 }
1474 }
1475 whites[i] = NULL;
1476
1477 /* The list of commandline macros should be very short.
1478 Accept the N*M complexity. */
1479 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1480 {
1481 found = FALSE;
1482 for (uschar ** w = whites; *w; ++w)
1483 if (Ustrcmp(*w, m->name) == 0)
1484 {
1485 found = TRUE;
1486 break;
1487 }
1488 if (!found)
1489 return FALSE;
1490 if (!m->replacement)
1491 continue;
1492 if ((len = m->replen) == 0)
1493 continue;
1494 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1495 0, PCRE_EOPT, NULL, 0);
1496 if (n < 0)
1497 {
1498 if (n != PCRE_ERROR_NOMATCH)
1499 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1500 return FALSE;
1501 }
1502 }
1503 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1504 return TRUE;
1505 #endif
1506 }
1507
1508
1509 /*************************************************
1510 * Expansion testing *
1511 *************************************************/
1512
1513 /* Expand and print one item, doing macro-processing.
1514
1515 Arguments:
1516 item line for expansion
1517 */
1518
1519 static void
1520 expansion_test_line(uschar * line)
1521 {
1522 int len;
1523 BOOL dummy_macexp;
1524
1525 Ustrncpy(big_buffer, line, big_buffer_size);
1526 big_buffer[big_buffer_size-1] = '\0';
1527 len = Ustrlen(big_buffer);
1528
1529 (void) macros_expand(0, &len, &dummy_macexp);
1530
1531 if (isupper(big_buffer[0]))
1532 {
1533 if (macro_read_assignment(big_buffer))
1534 printf("Defined macro '%s'\n", mlast->name);
1535 }
1536 else
1537 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1538 else printf("Failed: %s\n", expand_string_message);
1539 }
1540
1541
1542
1543 /*************************************************
1544 * Entry point and high-level code *
1545 *************************************************/
1546
1547 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1548 the appropriate action. All the necessary functions are present in the one
1549 binary. I originally thought one should split it up, but it turns out that so
1550 much of the apparatus is needed in each chunk that one might as well just have
1551 it all available all the time, which then makes the coding easier as well.
1552
1553 Arguments:
1554 argc count of entries in argv
1555 argv argument strings, with argv[0] being the program name
1556
1557 Returns: EXIT_SUCCESS if terminated successfully
1558 EXIT_FAILURE otherwise, except when a message has been sent
1559 to the sender, and -oee was given
1560 */
1561
1562 int
1563 main(int argc, char **cargv)
1564 {
1565 uschar **argv = USS cargv;
1566 int arg_receive_timeout = -1;
1567 int arg_smtp_receive_timeout = -1;
1568 int arg_error_handling = error_handling;
1569 int filter_sfd = -1;
1570 int filter_ufd = -1;
1571 int group_count;
1572 int i, rv;
1573 int list_queue_option = 0;
1574 int msg_action = 0;
1575 int msg_action_arg = -1;
1576 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1577 int queue_only_reason = 0;
1578 #ifdef EXIM_PERL
1579 int perl_start_option = 0;
1580 #endif
1581 int recipients_arg = argc;
1582 int sender_address_domain = 0;
1583 int test_retry_arg = -1;
1584 int test_rewrite_arg = -1;
1585 gid_t original_egid;
1586 BOOL arg_queue_only = FALSE;
1587 BOOL bi_option = FALSE;
1588 BOOL checking = FALSE;
1589 BOOL count_queue = FALSE;
1590 BOOL expansion_test = FALSE;
1591 BOOL extract_recipients = FALSE;
1592 BOOL flag_G = FALSE;
1593 BOOL flag_n = FALSE;
1594 BOOL forced_delivery = FALSE;
1595 BOOL f_end_dot = FALSE;
1596 BOOL deliver_give_up = FALSE;
1597 BOOL list_queue = FALSE;
1598 BOOL list_options = FALSE;
1599 BOOL list_config = FALSE;
1600 BOOL local_queue_only;
1601 BOOL more = TRUE;
1602 BOOL one_msg_action = FALSE;
1603 BOOL opt_D_used = FALSE;
1604 BOOL queue_only_set = FALSE;
1605 BOOL receiving_message = TRUE;
1606 BOOL sender_ident_set = FALSE;
1607 BOOL session_local_queue_only;
1608 BOOL unprivileged;
1609 BOOL removed_privilege = FALSE;
1610 BOOL usage_wanted = FALSE;
1611 BOOL verify_address_mode = FALSE;
1612 BOOL verify_as_sender = FALSE;
1613 BOOL version_printed = FALSE;
1614 uschar *alias_arg = NULL;
1615 uschar *called_as = US"";
1616 uschar *cmdline_syslog_name = NULL;
1617 uschar *start_queue_run_id = NULL;
1618 uschar *stop_queue_run_id = NULL;
1619 uschar *expansion_test_message = NULL;
1620 uschar *ftest_domain = NULL;
1621 uschar *ftest_localpart = NULL;
1622 uschar *ftest_prefix = NULL;
1623 uschar *ftest_suffix = NULL;
1624 uschar *log_oneline = NULL;
1625 uschar *malware_test_file = NULL;
1626 uschar *real_sender_address;
1627 uschar *originator_home = US"/";
1628 size_t sz;
1629 rmark reset_point;
1630
1631 struct passwd *pw;
1632 struct stat statbuf;
1633 pid_t passed_qr_pid = (pid_t)0;
1634 int passed_qr_pipe = -1;
1635 gid_t group_list[EXIM_GROUPLIST_SIZE];
1636
1637 /* For the -bI: flag */
1638 enum commandline_info info_flag = CMDINFO_NONE;
1639 BOOL info_stdout = FALSE;
1640
1641 /* Possible options for -R and -S */
1642
1643 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1644
1645 /* Need to define this in case we need to change the environment in order
1646 to get rid of a bogus time zone. We have to make it char rather than uschar
1647 because some OS define it in /usr/include/unistd.h. */
1648
1649 extern char **environ;
1650
1651 #ifdef MEASURE_TIMING
1652 (void)gettimeofday(&timestamp_startup, NULL);
1653 #endif
1654
1655 /* If the Exim user and/or group and/or the configuration file owner/group were
1656 defined by ref:name at build time, we must now find the actual uid/gid values.
1657 This is a feature to make the lives of binary distributors easier. */
1658
1659 #ifdef EXIM_USERNAME
1660 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1661 {
1662 if (exim_uid == 0)
1663 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1664
1665 /* If ref:name uses a number as the name, route_finduser() returns
1666 TRUE with exim_uid set and pw coerced to NULL. */
1667 if (pw)
1668 exim_gid = pw->pw_gid;
1669 #ifndef EXIM_GROUPNAME
1670 else
1671 exim_fail(
1672 "exim: ref:name should specify a usercode, not a group.\n"
1673 "exim: can't let you get away with it unless you also specify a group.\n");
1674 #endif
1675 }
1676 else
1677 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1678 #endif
1679
1680 #ifdef EXIM_GROUPNAME
1681 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1682 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1683 #endif
1684
1685 #ifdef CONFIGURE_OWNERNAME
1686 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1687 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1688 CONFIGURE_OWNERNAME);
1689 #endif
1690
1691 /* We default the system_filter_user to be the Exim run-time user, as a
1692 sane non-root value. */
1693 system_filter_uid = exim_uid;
1694
1695 #ifdef CONFIGURE_GROUPNAME
1696 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1697 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1698 CONFIGURE_GROUPNAME);
1699 #endif
1700
1701 /* In the Cygwin environment, some initialization used to need doing.
1702 It was fudged in by means of this macro; now no longer but we'll leave
1703 it in case of others. */
1704
1705 #ifdef OS_INIT
1706 OS_INIT
1707 #endif
1708
1709 /* Check a field which is patched when we are running Exim within its
1710 testing harness; do a fast initial check, and then the whole thing. */
1711
1712 f.running_in_test_harness =
1713 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1714 if (f.running_in_test_harness)
1715 debug_store = TRUE;
1716
1717 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1718 at the start of a program; however, it seems that some environments do not
1719 follow this. A "strange" locale can affect the formatting of timestamps, so we
1720 make quite sure. */
1721
1722 setlocale(LC_ALL, "C");
1723
1724 /* Get the offset between CLOCK_MONOTONIC and wallclock */
1725
1726 #ifdef _POSIX_MONOTONIC_CLOCK
1727 exim_clock_init();
1728 #endif
1729
1730 /* Set up the default handler for timing using alarm(). */
1731
1732 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1733
1734 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1735 because store_malloc writes a log entry on failure. */
1736
1737 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1738 exim_fail("exim: failed to get store for log buffer\n");
1739
1740 /* Initialize the default log options. */
1741
1742 bits_set(log_selector, log_selector_size, log_default);
1743
1744 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1745 NULL when the daemon is run and the file is closed. We have to use this
1746 indirection, because some systems don't allow writing to the variable "stderr".
1747 */
1748
1749 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1750
1751 /* Arrange for the PCRE regex library to use our store functions. Note that
1752 the normal calls are actually macros that add additional arguments for
1753 debugging purposes so we have to assign specially constructed functions here.
1754 The default is to use store in the stacking pool, but this is overridden in the
1755 regex_must_compile() function. */
1756
1757 pcre_malloc = function_store_get;
1758 pcre_free = function_dummy_free;
1759
1760 /* Ensure there is a big buffer for temporary use in several places. It is put
1761 in malloc store so that it can be freed for enlargement if necessary. */
1762
1763 big_buffer = store_malloc(big_buffer_size);
1764
1765 /* Set up the handler for the data request signal, and set the initial
1766 descriptive text. */
1767
1768 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1769 set_process_info("initializing");
1770 os_restarting_signal(SIGUSR1, usr1_handler);
1771
1772 /* If running in a dockerized environment, the TERM signal is only
1773 delegated to the PID 1 if we request it by setting an signal handler */
1774 if (getpid() == 1) signal(SIGTERM, term_handler);
1775
1776 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1777 in the daemon code. For the rest of Exim's uses, we ignore it. */
1778
1779 signal(SIGHUP, SIG_IGN);
1780
1781 /* We don't want to die on pipe errors as the code is written to handle
1782 the write error instead. */
1783
1784 signal(SIGPIPE, SIG_IGN);
1785
1786 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1787 set to SIG_IGN. This causes subprocesses that complete before the parent
1788 process waits for them not to hang around, so when Exim calls wait(), nothing
1789 is there. The wait() code has been made robust against this, but let's ensure
1790 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1791 ending status. We use sigaction rather than plain signal() on those OS where
1792 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1793 problem on AIX with this.) */
1794
1795 #ifdef SA_NOCLDWAIT
1796 {
1797 struct sigaction act;
1798 act.sa_handler = SIG_DFL;
1799 sigemptyset(&(act.sa_mask));
1800 act.sa_flags = 0;
1801 sigaction(SIGCHLD, &act, NULL);
1802 }
1803 #else
1804 signal(SIGCHLD, SIG_DFL);
1805 #endif
1806
1807 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1808 SIGHUP. */
1809
1810 sighup_argv = argv;
1811
1812 /* Set up the version number. Set up the leading 'E' for the external form of
1813 message ids, set the pointer to the internal form, and initialize it to
1814 indicate no message being processed. */
1815
1816 version_init();
1817 message_id_option[0] = '-';
1818 message_id_external = message_id_option + 1;
1819 message_id_external[0] = 'E';
1820 message_id = message_id_external + 1;
1821 message_id[0] = 0;
1822
1823 /* Set the umask to zero so that any files Exim creates using open() are
1824 created with the modes that it specifies. NOTE: Files created with fopen() have
1825 a problem, which was not recognized till rather late (February 2006). With this
1826 umask, such files will be world writeable. (They are all content scanning files
1827 in the spool directory, which isn't world-accessible, so this is not a
1828 disaster, but it's untidy.) I don't want to change this overall setting,
1829 however, because it will interact badly with the open() calls. Instead, there's
1830 now a function called modefopen() that fiddles with the umask while calling
1831 fopen(). */
1832
1833 (void)umask(0);
1834
1835 /* Precompile the regular expression for matching a message id. Keep this in
1836 step with the code that generates ids in the accept.c module. We need to do
1837 this here, because the -M options check their arguments for syntactic validity
1838 using mac_ismsgid, which uses this. */
1839
1840 regex_ismsgid =
1841 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1842
1843 /* Precompile the regular expression that is used for matching an SMTP error
1844 code, possibly extended, at the start of an error message. Note that the
1845 terminating whitespace character is included. */
1846
1847 regex_smtp_code =
1848 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1849 FALSE, TRUE);
1850
1851 #ifdef WHITELIST_D_MACROS
1852 /* Precompile the regular expression used to filter the content of macros
1853 given to -D for permissibility. */
1854
1855 regex_whitelisted_macro =
1856 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1857 #endif
1858
1859 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1860
1861 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1862 this seems to be a generally accepted convention, since one finds symbolic
1863 links called "mailq" in standard OS configurations. */
1864
1865 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1866 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1867 {
1868 list_queue = TRUE;
1869 receiving_message = FALSE;
1870 called_as = US"-mailq";
1871 }
1872
1873 /* If the program is called as "rmail" treat it as equivalent to
1874 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1875 i.e. preventing a single dot on a line from terminating the message, and
1876 returning with zero return code, even in cases of error (provided an error
1877 message has been sent). */
1878
1879 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1880 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1881 {
1882 f.dot_ends = FALSE;
1883 called_as = US"-rmail";
1884 errors_sender_rc = EXIT_SUCCESS;
1885 }
1886
1887 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1888 this is a smail convention. */
1889
1890 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1891 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1892 {
1893 smtp_input = smtp_batched_input = TRUE;
1894 called_as = US"-rsmtp";
1895 }
1896
1897 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1898 this is a smail convention. */
1899
1900 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1901 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1902 {
1903 queue_interval = 0;
1904 receiving_message = FALSE;
1905 called_as = US"-runq";
1906 }
1907
1908 /* If the program is called as "newaliases" treat it as equivalent to
1909 "exim -bi"; this is a sendmail convention. */
1910
1911 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1912 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1913 {
1914 bi_option = TRUE;
1915 receiving_message = FALSE;
1916 called_as = US"-newaliases";
1917 }
1918
1919 /* Save the original effective uid for a couple of uses later. It should
1920 normally be root, but in some esoteric environments it may not be. */
1921
1922 original_euid = geteuid();
1923 original_egid = getegid();
1924
1925 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1926 to be the same as the real ones. This makes a difference only if Exim is setuid
1927 (or setgid) to something other than root, which could be the case in some
1928 special configurations. */
1929
1930 real_uid = getuid();
1931 real_gid = getgid();
1932
1933 if (real_uid == root_uid)
1934 {
1935 if ((rv = setgid(real_gid)))
1936 exim_fail("exim: setgid(%ld) failed: %s\n",
1937 (long int)real_gid, strerror(errno));
1938 if ((rv = setuid(real_uid)))
1939 exim_fail("exim: setuid(%ld) failed: %s\n",
1940 (long int)real_uid, strerror(errno));
1941 }
1942
1943 /* If neither the original real uid nor the original euid was root, Exim is
1944 running in an unprivileged state. */
1945
1946 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1947
1948 /* Scan the program's arguments. Some can be dealt with right away; others are
1949 simply recorded for checking and handling afterwards. Do a high-level switch
1950 on the second character (the one after '-'), to save some effort. */
1951
1952 for (i = 1; i < argc; i++)
1953 {
1954 BOOL badarg = FALSE;
1955 uschar *arg = argv[i];
1956 uschar *argrest;
1957 int switchchar;
1958
1959 /* An argument not starting with '-' is the start of a recipients list;
1960 break out of the options-scanning loop. */
1961
1962 if (arg[0] != '-')
1963 {
1964 recipients_arg = i;
1965 break;
1966 }
1967
1968 /* An option consisting of -- terminates the options */
1969
1970 if (Ustrcmp(arg, "--") == 0)
1971 {
1972 recipients_arg = i + 1;
1973 break;
1974 }
1975
1976 /* Handle flagged options */
1977
1978 switchchar = arg[1];
1979 argrest = arg+2;
1980
1981 /* Make all -ex options synonymous with -oex arguments, since that
1982 is assumed by various callers. Also make -qR options synonymous with -R
1983 options, as that seems to be required as well. Allow for -qqR too, and
1984 the same for -S options. */
1985
1986 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1987 Ustrncmp(arg+1, "qR", 2) == 0 ||
1988 Ustrncmp(arg+1, "qS", 2) == 0)
1989 {
1990 switchchar = arg[2];
1991 argrest++;
1992 }
1993 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1994 {
1995 switchchar = arg[3];
1996 argrest += 2;
1997 f.queue_2stage = TRUE;
1998 }
1999
2000 /* Make -r synonymous with -f, since it is a documented alias */
2001
2002 else if (arg[1] == 'r') switchchar = 'f';
2003
2004 /* Make -ov synonymous with -v */
2005
2006 else if (Ustrcmp(arg, "-ov") == 0)
2007 {
2008 switchchar = 'v';
2009 argrest++;
2010 }
2011
2012 /* deal with --option_aliases */
2013 else if (switchchar == '-')
2014 {
2015 if (Ustrcmp(argrest, "help") == 0)
2016 {
2017 usage_wanted = TRUE;
2018 break;
2019 }
2020 else if (Ustrcmp(argrest, "version") == 0)
2021 {
2022 switchchar = 'b';
2023 argrest = US"V";
2024 }
2025 }
2026
2027 /* High-level switch on active initial letter */
2028
2029 switch(switchchar)
2030 {
2031
2032 /* sendmail uses -Ac and -Am to control which .cf file is used;
2033 we ignore them. */
2034 case 'A':
2035 if (*argrest == '\0') { badarg = TRUE; break; }
2036 else
2037 {
2038 BOOL ignore = FALSE;
2039 switch (*argrest)
2040 {
2041 case 'c':
2042 case 'm':
2043 if (*(argrest + 1) == '\0')
2044 ignore = TRUE;
2045 break;
2046 }
2047 if (!ignore) badarg = TRUE;
2048 }
2049 break;
2050
2051 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2052 so has no need of it. */
2053
2054 case 'B':
2055 if (!*argrest) i++; /* Skip over the type */
2056 break;
2057
2058
2059 case 'b':
2060 {
2061 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2062
2063 switch (*argrest++)
2064 {
2065 /* -bd: Run in daemon mode, awaiting SMTP connections.
2066 -bdf: Ditto, but in the foreground.
2067 */
2068 case 'd':
2069 f.daemon_listen = TRUE;
2070 if (*argrest == 'f') f.background_daemon = FALSE;
2071 else if (*argrest) badarg = TRUE;
2072 break;
2073
2074 /* -be: Run in expansion test mode
2075 -bem: Ditto, but read a message from a file first
2076 */
2077 case 'e':
2078 expansion_test = checking = TRUE;
2079 if (*argrest == 'm')
2080 {
2081 if (++i >= argc) { badarg = TRUE; break; }
2082 expansion_test_message = argv[i];
2083 argrest++;
2084 }
2085 if (*argrest) badarg = TRUE;
2086 break;
2087
2088 /* -bF: Run system filter test */
2089 case 'F':
2090 filter_test |= checking = FTEST_SYSTEM;
2091 if (*argrest) { badarg = TRUE; break; }
2092 if (++i < argc) filter_test_sfile = argv[i]; else
2093 exim_fail("exim: file name expected after %s\n", argv[i-1]);
2094 break;
2095
2096 /* -bf: Run user filter test
2097 -bfd: Set domain for filter testing
2098 -bfl: Set local part for filter testing
2099 -bfp: Set prefix for filter testing
2100 -bfs: Set suffix for filter testing
2101 */
2102 case 'f':
2103 if (!*argrest)
2104 {
2105 filter_test |= checking = FTEST_USER;
2106 if (++i < argc) filter_test_ufile = argv[i];
2107 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2108 }
2109 else
2110 {
2111 if (++i >= argc)
2112 exim_fail("exim: string expected after %s\n", arg);
2113 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2114 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2115 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2116 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2117 else badarg = TRUE;
2118 }
2119 break;
2120
2121 /* -bh: Host checking - an IP address must follow. */
2122 case 'h':
2123 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2124 {
2125 if (++i >= argc) { badarg = TRUE; break; }
2126 sender_host_address = argv[i];
2127 host_checking = checking = f.log_testing_mode = TRUE;
2128 f.host_checking_callout = *argrest == 'c';
2129 message_logs = FALSE;
2130 }
2131 else badarg = TRUE;
2132 break;
2133
2134 /* -bi: This option is used by sendmail to initialize *the* alias file,
2135 though it has the -oA option to specify a different file. Exim has no
2136 concept of *the* alias file, but since Sun's YP make script calls
2137 sendmail this way, some support must be provided. */
2138 case 'i':
2139 if (!*++argrest) bi_option = TRUE;
2140 else badarg = TRUE;
2141 break;
2142
2143 /* -bI: provide information, of the type to follow after a colon.
2144 This is an Exim flag. */
2145 case 'I':
2146 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2147 {
2148 uschar *p = argrest+1;
2149 info_flag = CMDINFO_HELP;
2150 if (Ustrlen(p))
2151 if (strcmpic(p, CUS"sieve") == 0)
2152 {
2153 info_flag = CMDINFO_SIEVE;
2154 info_stdout = TRUE;
2155 }
2156 else if (strcmpic(p, CUS"dscp") == 0)
2157 {
2158 info_flag = CMDINFO_DSCP;
2159 info_stdout = TRUE;
2160 }
2161 else if (strcmpic(p, CUS"help") == 0)
2162 info_stdout = TRUE;
2163 }
2164 else badarg = TRUE;
2165 break;
2166
2167 /* -bm: Accept and deliver message - the default option. Reinstate
2168 receiving_message, which got turned off for all -b options.
2169 -bmalware: test the filename given for malware */
2170 case 'm':
2171 if (!*argrest) receiving_message = TRUE;
2172 else if (Ustrcmp(argrest, "alware") == 0)
2173 {
2174 if (++i >= argc) { badarg = TRUE; break; }
2175 checking = TRUE;
2176 malware_test_file = argv[i];
2177 }
2178 else badarg = TRUE;
2179 break;
2180
2181 /* -bnq: For locally originating messages, do not qualify unqualified
2182 addresses. In the envelope, this causes errors; in header lines they
2183 just get left. */
2184 case 'n':
2185 if (Ustrcmp(argrest, "q") == 0)
2186 {
2187 f.allow_unqualified_sender = FALSE;
2188 f.allow_unqualified_recipient = FALSE;
2189 }
2190 else badarg = TRUE;
2191 break;
2192
2193 /* -bpxx: List the contents of the mail queue, in various forms. If
2194 the option is -bpc, just a queue count is needed. Otherwise, if the
2195 first letter after p is r, then order is random. */
2196 case 'p':
2197 if (*argrest == 'c')
2198 {
2199 count_queue = TRUE;
2200 if (*++argrest) badarg = TRUE;
2201 break;
2202 }
2203
2204 if (*argrest == 'r')
2205 {
2206 list_queue_option = 8;
2207 argrest++;
2208 }
2209 else list_queue_option = 0;
2210
2211 list_queue = TRUE;
2212
2213 /* -bp: List the contents of the mail queue, top-level only */
2214
2215 if (!*argrest) {}
2216
2217 /* -bpu: List the contents of the mail queue, top-level undelivered */
2218
2219 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2220
2221 /* -bpa: List the contents of the mail queue, including all delivered */
2222
2223 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2224
2225 /* Unknown after -bp[r] */
2226
2227 else badarg = TRUE;
2228 break;
2229
2230
2231 /* -bP: List the configuration variables given as the address list.
2232 Force -v, so configuration errors get displayed. */
2233 case 'P':
2234
2235 /* -bP config: we need to setup here, because later,
2236 * when list_options is checked, the config is read already */
2237 if (*argrest)
2238 badarg = TRUE;
2239 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2240 {
2241 list_config = TRUE;
2242 readconf_save_config(version_string);
2243 }
2244 else
2245 {
2246 list_options = TRUE;
2247 debug_selector |= D_v;
2248 debug_file = stderr;
2249 }
2250 break;
2251
2252 /* -brt: Test retry configuration lookup */
2253 case 'r':
2254 if (Ustrcmp(argrest, "t") == 0)
2255 {
2256 checking = TRUE;
2257 test_retry_arg = i + 1;
2258 goto END_ARG;
2259 }
2260
2261 /* -brw: Test rewrite configuration */
2262
2263 else if (Ustrcmp(argrest, "w") == 0)
2264 {
2265 checking = TRUE;
2266 test_rewrite_arg = i + 1;
2267 goto END_ARG;
2268 }
2269 else badarg = TRUE;
2270 break;
2271
2272 /* -bS: Read SMTP commands on standard input, but produce no replies -
2273 all errors are reported by sending messages. */
2274 case 'S':
2275 if (!*argrest)
2276 smtp_input = smtp_batched_input = receiving_message = TRUE;
2277 else badarg = TRUE;
2278 break;
2279
2280 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2281 on standard output. */
2282 case 's':
2283 if (!*argrest) smtp_input = receiving_message = TRUE;
2284 else badarg = TRUE;
2285 break;
2286
2287 /* -bt: address testing mode */
2288 case 't':
2289 if (!*argrest)
2290 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2291 else badarg = TRUE;
2292 break;
2293
2294 /* -bv: verify addresses */
2295 case 'v':
2296 if (!*argrest)
2297 verify_address_mode = checking = f.log_testing_mode = TRUE;
2298
2299 /* -bvs: verify sender addresses */
2300
2301 else if (Ustrcmp(argrest, "s") == 0)
2302 {
2303 verify_address_mode = checking = f.log_testing_mode = TRUE;
2304 verify_as_sender = TRUE;
2305 }
2306 else badarg = TRUE;
2307 break;
2308
2309 /* -bV: Print version string and support details */
2310 case 'V':
2311 if (!*argrest)
2312 {
2313 printf("Exim version %s #%s built %s\n", version_string,
2314 version_cnumber, version_date);
2315 printf("%s\n", CS version_copyright);
2316 version_printed = TRUE;
2317 show_whats_supported(stdout);
2318 f.log_testing_mode = TRUE;
2319 }
2320 else badarg = TRUE;
2321 break;
2322
2323 /* -bw: inetd wait mode, accept a listening socket as stdin */
2324 case 'w':
2325 f.inetd_wait_mode = TRUE;
2326 f.background_daemon = FALSE;
2327 f.daemon_listen = TRUE;
2328 if (*argrest)
2329 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2330 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2331 break;
2332
2333 default:
2334 badarg = TRUE;
2335 break;
2336 }
2337 break;
2338 }
2339
2340
2341 /* -C: change configuration file list; ignore if it isn't really
2342 a change! Enforce a prefix check if required. */
2343
2344 case 'C':
2345 if (*argrest == 0)
2346 {
2347 if(++i < argc) argrest = argv[i]; else
2348 { badarg = TRUE; break; }
2349 }
2350 if (Ustrcmp(config_main_filelist, argrest) != 0)
2351 {
2352 #ifdef ALT_CONFIG_PREFIX
2353 int sep = 0;
2354 int len = Ustrlen(ALT_CONFIG_PREFIX);
2355 const uschar *list = argrest;
2356 uschar *filename;
2357 while((filename = string_nextinlist(&list, &sep, big_buffer,
2358 big_buffer_size)) != NULL)
2359 {
2360 if ((Ustrlen(filename) < len ||
2361 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
2362 Ustrstr(filename, "/../") != NULL) &&
2363 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
2364 exim_fail("-C Permission denied\n");
2365 }
2366 #endif
2367 if (real_uid != root_uid)
2368 {
2369 #ifdef TRUSTED_CONFIG_LIST
2370
2371 if (real_uid != exim_uid
2372 #ifdef CONFIGURE_OWNER
2373 && real_uid != config_uid
2374 #endif
2375 )
2376 f.trusted_config = FALSE;
2377 else
2378 {
2379 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2380 if (trust_list)
2381 {
2382 struct stat statbuf;
2383
2384 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2385 (statbuf.st_uid != root_uid /* owner not root */
2386 #ifdef CONFIGURE_OWNER
2387 && statbuf.st_uid != config_uid /* owner not the special one */
2388 #endif
2389 ) || /* or */
2390 (statbuf.st_gid != root_gid /* group not root */
2391 #ifdef CONFIGURE_GROUP
2392 && statbuf.st_gid != config_gid /* group not the special one */
2393 #endif
2394 && (statbuf.st_mode & 020) != 0 /* group writeable */
2395 ) || /* or */
2396 (statbuf.st_mode & 2) != 0) /* world writeable */
2397 {
2398 f.trusted_config = FALSE;
2399 fclose(trust_list);
2400 }
2401 else
2402 {
2403 /* Well, the trust list at least is up to scratch... */
2404 rmark reset_point = store_mark();
2405 uschar *trusted_configs[32];
2406 int nr_configs = 0;
2407 int i = 0;
2408
2409 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2410 {
2411 uschar *start = big_buffer, *nl;
2412 while (*start && isspace(*start))
2413 start++;
2414 if (*start != '/')
2415 continue;
2416 nl = Ustrchr(start, '\n');
2417 if (nl)
2418 *nl = 0;
2419 trusted_configs[nr_configs++] = string_copy(start);
2420 if (nr_configs == 32)
2421 break;
2422 }
2423 fclose(trust_list);
2424
2425 if (nr_configs)
2426 {
2427 int sep = 0;
2428 const uschar *list = argrest;
2429 uschar *filename;
2430 while (f.trusted_config && (filename = string_nextinlist(&list,
2431 &sep, big_buffer, big_buffer_size)) != NULL)
2432 {
2433 for (i=0; i < nr_configs; i++)
2434 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2435 break;
2436 if (i == nr_configs)
2437 {
2438 f.trusted_config = FALSE;
2439 break;
2440 }
2441 }
2442 }
2443 else /* No valid prefixes found in trust_list file. */
2444 f.trusted_config = FALSE;
2445 store_reset(reset_point);
2446 }
2447 }
2448 else /* Could not open trust_list file. */
2449 f.trusted_config = FALSE;
2450 }
2451 #else
2452 /* Not root; don't trust config */
2453 f.trusted_config = FALSE;
2454 #endif
2455 }
2456
2457 config_main_filelist = argrest;
2458 f.config_changed = TRUE;
2459 }
2460 break;
2461
2462
2463 /* -D: set up a macro definition */
2464
2465 case 'D':
2466 #ifdef DISABLE_D_OPTION
2467 exim_fail("exim: -D is not available in this Exim binary\n");
2468 #else
2469 {
2470 int ptr = 0;
2471 macro_item *m;
2472 uschar name[24];
2473 uschar *s = argrest;
2474
2475 opt_D_used = TRUE;
2476 while (isspace(*s)) s++;
2477
2478 if (*s < 'A' || *s > 'Z')
2479 exim_fail("exim: macro name set by -D must start with "
2480 "an upper case letter\n");
2481
2482 while (isalnum(*s) || *s == '_')
2483 {
2484 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2485 s++;
2486 }
2487 name[ptr] = 0;
2488 if (ptr == 0) { badarg = TRUE; break; }
2489 while (isspace(*s)) s++;
2490 if (*s != 0)
2491 {
2492 if (*s++ != '=') { badarg = TRUE; break; }
2493 while (isspace(*s)) s++;
2494 }
2495
2496 for (m = macros_user; m; m = m->next)
2497 if (Ustrcmp(m->name, name) == 0)
2498 exim_fail("exim: duplicated -D in command line\n");
2499
2500 m = macro_create(name, s, TRUE);
2501
2502 if (clmacro_count >= MAX_CLMACROS)
2503 exim_fail("exim: too many -D options on command line\n");
2504 clmacros[clmacro_count++] =
2505 string_sprintf("-D%s=%s", m->name, m->replacement);
2506 }
2507 #endif
2508 break;
2509
2510 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2511 The latter is now a no-op, retained for compatibility only. If -dd is used,
2512 debugging subprocesses of the daemon is disabled. */
2513
2514 case 'd':
2515 if (Ustrcmp(argrest, "ropcr") == 0)
2516 {
2517 /* drop_cr = TRUE; */
2518 }
2519
2520 /* Use an intermediate variable so that we don't set debugging while
2521 decoding the debugging bits. */
2522
2523 else
2524 {
2525 unsigned int selector = D_default;
2526 debug_selector = 0;
2527 debug_file = NULL;
2528 if (*argrest == 'd')
2529 {
2530 f.debug_daemon = TRUE;
2531 argrest++;
2532 }
2533 if (*argrest != 0)
2534 decode_bits(&selector, 1, debug_notall, argrest,
2535 debug_options, debug_options_count, US"debug", 0);
2536 debug_selector = selector;
2537 }
2538 break;
2539
2540
2541 /* -E: This is a local error message. This option is not intended for
2542 external use at all, but is not restricted to trusted callers because it
2543 does no harm (just suppresses certain error messages) and if Exim is run
2544 not setuid root it won't always be trusted when it generates error
2545 messages using this option. If there is a message id following -E, point
2546 message_reference at it, for logging. */
2547
2548 case 'E':
2549 f.local_error_message = TRUE;
2550 if (mac_ismsgid(argrest)) message_reference = argrest;
2551 break;
2552
2553
2554 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2555 option, so it looks as if historically the -oex options are also callable
2556 without the leading -o. So we have to accept them. Before the switch,
2557 anything starting -oe has been converted to -e. Exim does not support all
2558 of the sendmail error options. */
2559
2560 case 'e':
2561 if (Ustrcmp(argrest, "e") == 0)
2562 {
2563 arg_error_handling = ERRORS_SENDER;
2564 errors_sender_rc = EXIT_SUCCESS;
2565 }
2566 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2567 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2568 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2569 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2570 else badarg = TRUE;
2571 break;
2572
2573
2574 /* -F: Set sender's full name, used instead of the gecos entry from
2575 the password file. Since users can usually alter their gecos entries,
2576 there's no security involved in using this instead. The data can follow
2577 the -F or be in the next argument. */
2578
2579 case 'F':
2580 if (*argrest == 0)
2581 {
2582 if(++i < argc) argrest = argv[i]; else
2583 { badarg = TRUE; break; }
2584 }
2585 originator_name = argrest;
2586 f.sender_name_forced = TRUE;
2587 break;
2588
2589
2590 /* -f: Set sender's address - this value is only actually used if Exim is
2591 run by a trusted user, or if untrusted_set_sender is set and matches the
2592 address, except that the null address can always be set by any user. The
2593 test for this happens later, when the value given here is ignored when not
2594 permitted. For an untrusted user, the actual sender is still put in Sender:
2595 if it doesn't match the From: header (unless no_local_from_check is set).
2596 The data can follow the -f or be in the next argument. The -r switch is an
2597 obsolete form of -f but since there appear to be programs out there that
2598 use anything that sendmail has ever supported, better accept it - the
2599 synonymizing is done before the switch above.
2600
2601 At this stage, we must allow domain literal addresses, because we don't
2602 know what the setting of allow_domain_literals is yet. Ditto for trailing
2603 dots and strip_trailing_dot. */
2604
2605 case 'f':
2606 {
2607 int dummy_start, dummy_end;
2608 uschar *errmess;
2609 if (*argrest == 0)
2610 {
2611 if (i+1 < argc) argrest = argv[++i]; else
2612 { badarg = TRUE; break; }
2613 }
2614 if (*argrest == 0)
2615 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2616 else
2617 {
2618 uschar *temp = argrest + Ustrlen(argrest) - 1;
2619 while (temp >= argrest && isspace(*temp)) temp--;
2620 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2621 allow_domain_literals = TRUE;
2622 strip_trailing_dot = TRUE;
2623 #ifdef SUPPORT_I18N
2624 allow_utf8_domains = TRUE;
2625 #endif
2626 sender_address = parse_extract_address(argrest, &errmess,
2627 &dummy_start, &dummy_end, &sender_address_domain, TRUE);
2628 sender_address = string_copy_taint(sender_address, TRUE);
2629 #ifdef SUPPORT_I18N
2630 message_smtputf8 = string_is_utf8(sender_address);
2631 allow_utf8_domains = FALSE;
2632 #endif
2633 allow_domain_literals = FALSE;
2634 strip_trailing_dot = FALSE;
2635 if (!sender_address)
2636 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2637 }
2638 f.sender_address_forced = TRUE;
2639 }
2640 break;
2641
2642 /* -G: sendmail invocation to specify that it's a gateway submission and
2643 sendmail may complain about problems instead of fixing them.
2644 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2645 not at this time complain about problems. */
2646
2647 case 'G':
2648 flag_G = TRUE;
2649 break;
2650
2651 /* -h: Set the hop count for an incoming message. Exim does not currently
2652 support this; it always computes it by counting the Received: headers.
2653 To put it in will require a change to the spool header file format. */
2654
2655 case 'h':
2656 if (*argrest == 0)
2657 {
2658 if(++i < argc) argrest = argv[i]; else
2659 { badarg = TRUE; break; }
2660 }
2661 if (!isdigit(*argrest)) badarg = TRUE;
2662 break;
2663
2664
2665 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2666 not to be documented for sendmail but mailx (at least) uses it) */
2667
2668 case 'i':
2669 if (*argrest == 0) f.dot_ends = FALSE; else badarg = TRUE;
2670 break;
2671
2672
2673 /* -L: set the identifier used for syslog; equivalent to setting
2674 syslog_processname in the config file, but needs to be an admin option. */
2675
2676 case 'L':
2677 if (*argrest == '\0')
2678 {
2679 if(++i < argc) argrest = argv[i]; else
2680 { badarg = TRUE; break; }
2681 }
2682 if ((sz = Ustrlen(argrest)) > 32)
2683 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2684 if (sz < 1)
2685 exim_fail("exim: the -L syslog name is too short\n");
2686 cmdline_syslog_name = argrest;
2687 break;
2688
2689 case 'M':
2690 receiving_message = FALSE;
2691
2692 /* -MC: continue delivery of another message via an existing open
2693 file descriptor. This option is used for an internal call by the
2694 smtp transport when there is a pending message waiting to go to an
2695 address to which it has got a connection. Five subsequent arguments are
2696 required: transport name, host name, IP address, sequence number, and
2697 message_id. Transports may decline to create new processes if the sequence
2698 number gets too big. The channel is stdin. This (-MC) must be the last
2699 argument. There's a subsequent check that the real-uid is privileged.
2700
2701 If we are running in the test harness. delay for a bit, to let the process
2702 that set this one up complete. This makes for repeatability of the logging,
2703 etc. output. */
2704
2705 if (Ustrcmp(argrest, "C") == 0)
2706 {
2707 union sockaddr_46 interface_sock;
2708 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2709
2710 if (argc != i + 6)
2711 exim_fail("exim: too many or too few arguments after -MC\n");
2712
2713 if (msg_action_arg >= 0)
2714 exim_fail("exim: incompatible arguments\n");
2715
2716 continue_transport = argv[++i];
2717 continue_hostname = argv[++i];
2718 continue_host_address = argv[++i];
2719 continue_sequence = Uatoi(argv[++i]);
2720 msg_action = MSG_DELIVER;
2721 msg_action_arg = ++i;
2722 forced_delivery = TRUE;
2723 queue_run_pid = passed_qr_pid;
2724 queue_run_pipe = passed_qr_pipe;
2725
2726 if (!mac_ismsgid(argv[i]))
2727 exim_fail("exim: malformed message id %s after -MC option\n",
2728 argv[i]);
2729
2730 /* Set up $sending_ip_address and $sending_port, unless proxied */
2731
2732 if (!continue_proxy_cipher)
2733 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2734 &size) == 0)
2735 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2736 &sending_port);
2737 else
2738 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2739 strerror(errno));
2740
2741 testharness_pause_ms(500);
2742 break;
2743 }
2744
2745 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2746 {
2747 switch(argrest[1])
2748 {
2749 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2750 precedes -MC (see above). The flag indicates that the host to which
2751 Exim is connected has accepted an AUTH sequence. */
2752
2753 case 'A': f.smtp_authenticated = TRUE; break;
2754
2755 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2756 that exim is connected to supports the esmtp extension DSN */
2757
2758 case 'D': smtp_peer_options |= OPTION_DSN; break;
2759
2760 /* -MCG: set the queue name, to a non-default value */
2761
2762 case 'G': if (++i < argc) queue_name = string_copy(argv[i]);
2763 else badarg = TRUE;
2764 break;
2765
2766 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2767
2768 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2769
2770 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2771 it preceded -MC (see above) */
2772
2773 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2774
2775 /* -MCQ: pass on the pid of the queue-running process that started
2776 this chain of deliveries and the fd of its synchronizing pipe; this
2777 is useful only when it precedes -MC (see above) */
2778
2779 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2780 else badarg = TRUE;
2781 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2782 else badarg = TRUE;
2783 break;
2784
2785 /* -MCS: set the smtp_use_size flag; this is useful only when it
2786 precedes -MC (see above) */
2787
2788 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2789
2790 #ifndef DISABLE_TLS
2791 /* -MCt: similar to -MCT below but the connection is still open
2792 via a proxy process which handles the TLS context and coding.
2793 Require three arguments for the proxied local address and port,
2794 and the TLS cipher. */
2795
2796 case 't': if (++i < argc) sending_ip_address = argv[i];
2797 else badarg = TRUE;
2798 if (++i < argc) sending_port = (int)(Uatol(argv[i]));
2799 else badarg = TRUE;
2800 if (++i < argc) continue_proxy_cipher = argv[i];
2801 else badarg = TRUE;
2802 /*FALLTHROUGH*/
2803
2804 /* -MCT: set the tls_offered flag; this is useful only when it
2805 precedes -MC (see above). The flag indicates that the host to which
2806 Exim is connected has offered TLS support. */
2807
2808 case 'T': smtp_peer_options |= OPTION_TLS; break;
2809 #endif
2810
2811 default: badarg = TRUE; break;
2812 }
2813 break;
2814 }
2815
2816 /* -M[x]: various operations on the following list of message ids:
2817 -M deliver the messages, ignoring next retry times and thawing
2818 -Mc deliver the messages, checking next retry times, no thawing
2819 -Mf freeze the messages
2820 -Mg give up on the messages
2821 -Mt thaw the messages
2822 -Mrm remove the messages
2823 In the above cases, this must be the last option. There are also the
2824 following options which are followed by a single message id, and which
2825 act on that message. Some of them use the "recipient" addresses as well.
2826 -Mar add recipient(s)
2827 -Mmad mark all recipients delivered
2828 -Mmd mark recipients(s) delivered
2829 -Mes edit sender
2830 -Mset load a message for use with -be
2831 -Mvb show body
2832 -Mvc show copy (of whole message, in RFC 2822 format)
2833 -Mvh show header
2834 -Mvl show log
2835 */
2836
2837 else if (*argrest == 0)
2838 {
2839 msg_action = MSG_DELIVER;
2840 forced_delivery = f.deliver_force_thaw = TRUE;
2841 }
2842 else if (Ustrcmp(argrest, "ar") == 0)
2843 {
2844 msg_action = MSG_ADD_RECIPIENT;
2845 one_msg_action = TRUE;
2846 }
2847 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2848 else if (Ustrcmp(argrest, "es") == 0)
2849 {
2850 msg_action = MSG_EDIT_SENDER;
2851 one_msg_action = TRUE;
2852 }
2853 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2854 else if (Ustrcmp(argrest, "g") == 0)
2855 {
2856 msg_action = MSG_DELIVER;
2857 deliver_give_up = TRUE;
2858 }
2859 else if (Ustrcmp(argrest, "G") == 0)
2860 {
2861 msg_action = MSG_SETQUEUE;
2862 queue_name_dest = argv[++i];
2863 }
2864 else if (Ustrcmp(argrest, "mad") == 0)
2865 {
2866 msg_action = MSG_MARK_ALL_DELIVERED;
2867 }
2868 else if (Ustrcmp(argrest, "md") == 0)
2869 {
2870 msg_action = MSG_MARK_DELIVERED;
2871 one_msg_action = TRUE;
2872 }
2873 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2874 else if (Ustrcmp(argrest, "set") == 0)
2875 {
2876 msg_action = MSG_LOAD;
2877 one_msg_action = TRUE;
2878 }
2879 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2880 else if (Ustrcmp(argrest, "vb") == 0)
2881 {
2882 msg_action = MSG_SHOW_BODY;
2883 one_msg_action = TRUE;
2884 }
2885 else if (Ustrcmp(argrest, "vc") == 0)
2886 {
2887 msg_action = MSG_SHOW_COPY;
2888 one_msg_action = TRUE;
2889 }
2890 else if (Ustrcmp(argrest, "vh") == 0)
2891 {
2892 msg_action = MSG_SHOW_HEADER;
2893 one_msg_action = TRUE;
2894 }
2895 else if (Ustrcmp(argrest, "vl") == 0)
2896 {
2897 msg_action = MSG_SHOW_LOG;
2898 one_msg_action = TRUE;
2899 }
2900 else { badarg = TRUE; break; }
2901
2902 /* All the -Mxx options require at least one message id. */
2903
2904 msg_action_arg = i + 1;
2905 if (msg_action_arg >= argc)
2906 exim_fail("exim: no message ids given after %s option\n", arg);
2907
2908 /* Some require only message ids to follow */
2909
2910 if (!one_msg_action)
2911 {
2912 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2913 exim_fail("exim: malformed message id %s after %s option\n",
2914 argv[j], arg);
2915 goto END_ARG; /* Remaining args are ids */
2916 }
2917
2918 /* Others require only one message id, possibly followed by addresses,
2919 which will be handled as normal arguments. */
2920
2921 else
2922 {
2923 if (!mac_ismsgid(argv[msg_action_arg]))
2924 exim_fail("exim: malformed message id %s after %s option\n",
2925 argv[msg_action_arg], arg);
2926 i++;
2927 }
2928 break;
2929
2930
2931 /* Some programs seem to call the -om option without the leading o;
2932 for sendmail it askes for "me too". Exim always does this. */
2933
2934 case 'm':
2935 if (*argrest != 0) badarg = TRUE;
2936 break;
2937
2938
2939 /* -N: don't do delivery - a debugging option that stops transports doing
2940 their thing. It implies debugging at the D_v level. */
2941
2942 case 'N':
2943 if (*argrest == 0)
2944 {
2945 f.dont_deliver = TRUE;
2946 debug_selector |= D_v;
2947 debug_file = stderr;
2948 }
2949 else badarg = TRUE;
2950 break;
2951
2952
2953 /* -n: This means "don't alias" in sendmail, apparently.
2954 For normal invocations, it has no effect.
2955 It may affect some other options. */
2956
2957 case 'n':
2958 flag_n = TRUE;
2959 break;
2960
2961 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2962 option to the specified value. This form uses long names. We need to handle
2963 -O option=value and -Ooption=value. */
2964
2965 case 'O':
2966 if (*argrest == 0)
2967 if (++i >= argc)
2968 exim_fail("exim: string expected after -O\n");
2969 break;
2970
2971 case 'o':
2972 switch (*argrest++)
2973 {
2974 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2975 file" option). */
2976 case 'A':
2977 if (!*(alias_arg = argrest))
2978 if (i+1 < argc) alias_arg = argv[++i];
2979 else exim_fail("exim: string expected after -oA\n");
2980 break;
2981
2982 /* -oB: Set a connection message max value for remote deliveries */
2983 case 'B':
2984 {
2985 uschar * p = argrest;
2986 if (!*p)
2987 if (i+1 < argc && isdigit((argv[i+1][0])))
2988 p = argv[++i];
2989 else
2990 {
2991 connection_max_messages = 1;
2992 p = NULL;
2993 }
2994
2995 if (p)
2996 {
2997 if (!isdigit(*p))
2998 exim_fail("exim: number expected after -oB\n");
2999 connection_max_messages = Uatoi(p);
3000 }
3001 }
3002 break;
3003
3004 /* -odb: background delivery */
3005
3006 case 'd':
3007 if (Ustrcmp(argrest, "b") == 0)
3008 {
3009 f.synchronous_delivery = FALSE;
3010 arg_queue_only = FALSE;
3011 queue_only_set = TRUE;
3012 }
3013
3014 /* -odd: testsuite-only: add no inter-process delays */
3015
3016 else if (Ustrcmp(argrest, "d") == 0)
3017 f.testsuite_delays = FALSE;
3018
3019 /* -odf: foreground delivery (smail-compatible option); same effect as
3020 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3021 */
3022
3023 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3024 {
3025 f.synchronous_delivery = TRUE;
3026 arg_queue_only = FALSE;
3027 queue_only_set = TRUE;
3028 }
3029
3030 /* -odq: queue only */
3031
3032 else if (Ustrcmp(argrest, "q") == 0)
3033 {
3034 f.synchronous_delivery = FALSE;
3035 arg_queue_only = TRUE;
3036 queue_only_set = TRUE;
3037 }
3038
3039 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3040 but no remote delivery */
3041
3042 else if (Ustrcmp(argrest, "qs") == 0)
3043 {
3044 f.queue_smtp = TRUE;
3045 arg_queue_only = FALSE;
3046 queue_only_set = TRUE;
3047 }
3048 else badarg = TRUE;
3049 break;
3050
3051 /* -oex: Sendmail error flags. As these are also accepted without the
3052 leading -o prefix, for compatibility with vacation and other callers,
3053 they are handled with -e above. */
3054
3055 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3056 -oitrue: Another sendmail syntax for the same */
3057
3058 case 'i':
3059 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3060 f.dot_ends = FALSE;
3061 else badarg = TRUE;
3062 break;
3063
3064 /* -oM*: Set various characteristics for an incoming message; actually
3065 acted on for trusted callers only. */
3066
3067 case 'M':
3068 {
3069 if (i+1 >= argc)
3070 exim_fail("exim: data expected after -oM%s\n", argrest);
3071
3072 /* -oMa: Set sender host address */
3073
3074 if (Ustrcmp(argrest, "a") == 0) sender_host_address = argv[++i];
3075
3076 /* -oMaa: Set authenticator name */
3077
3078 else if (Ustrcmp(argrest, "aa") == 0)
3079 sender_host_authenticated = argv[++i];
3080
3081 /* -oMas: setting authenticated sender */
3082
3083 else if (Ustrcmp(argrest, "as") == 0)
3084 authenticated_sender = string_copy_taint(argv[++i], TRUE);
3085
3086 /* -oMai: setting authenticated id */
3087
3088 else if (Ustrcmp(argrest, "ai") == 0)
3089 authenticated_id = string_copy_taint(argv[++i], TRUE);
3090
3091 /* -oMi: Set incoming interface address */
3092
3093 else if (Ustrcmp(argrest, "i") == 0) interface_address = argv[++i];
3094
3095 /* -oMm: Message reference */
3096
3097 else if (Ustrcmp(argrest, "m") == 0)
3098 {
3099 if (!mac_ismsgid(argv[i+1]))
3100 exim_fail("-oMm must be a valid message ID\n");
3101 if (!f.trusted_config)
3102 exim_fail("-oMm must be called by a trusted user/config\n");
3103 message_reference = argv[++i];
3104 }
3105
3106 /* -oMr: Received protocol */
3107
3108 else if (Ustrcmp(argrest, "r") == 0)
3109
3110 if (received_protocol)
3111 exim_fail("received_protocol is set already\n");
3112 else
3113 received_protocol = argv[++i];
3114
3115 /* -oMs: Set sender host name */
3116
3117 else if (Ustrcmp(argrest, "s") == 0)
3118 sender_host_name = string_copy_taint(argv[++i], TRUE);
3119
3120 /* -oMt: Set sender ident */
3121
3122 else if (Ustrcmp(argrest, "t") == 0)
3123 {
3124 sender_ident_set = TRUE;
3125 sender_ident = argv[++i];
3126 }
3127
3128 /* Else a bad argument */
3129
3130 else
3131 badarg = TRUE;
3132 }
3133 break;
3134
3135 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3136 seem to call this as -m (undocumented), so that is also accepted (see
3137 above). */
3138 /* -oo: An ancient flag for old-style addresses which still seems to
3139 crop up in some calls (see in SCO). */
3140
3141 case 'm':
3142 case 'o':
3143 if (*argrest) badarg = TRUE;
3144 break;
3145
3146 /* -oP <name>: set pid file path for daemon
3147 -oPX: delete pid file of daemon */
3148
3149 case 'P':
3150 if (!*argrest) override_pid_file_path = argv[++i];
3151 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3152 else badarg = TRUE;
3153 break;
3154
3155
3156 /* -or <n>: set timeout for non-SMTP acceptance
3157 -os <n>: set timeout for SMTP acceptance */
3158
3159 case 'r':
3160 case 's':
3161 {
3162 int * tp = argrest[-1] == 'r'
3163 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3164 if (*argrest)
3165 *tp = readconf_readtime(argrest, 0, FALSE);
3166 else if (i+1 < argc)
3167 *tp = readconf_readtime(argv[++i], 0, FALSE);
3168
3169 if (*tp < 0)
3170 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3171 }
3172 break;
3173
3174 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3175
3176 case 'X':
3177 if (*argrest) badarg = TRUE;
3178 else override_local_interfaces = argv[++i];
3179 break;
3180
3181 /* Unknown -o argument */
3182
3183 default:
3184 badarg = TRUE;
3185 }
3186 break;
3187
3188
3189 /* -ps: force Perl startup; -pd force delayed Perl startup */
3190
3191 case 'p':
3192 #ifdef EXIM_PERL
3193 if (*argrest == 's' && argrest[1] == 0)
3194 {
3195 perl_start_option = 1;
3196 break;
3197 }
3198 if (*argrest == 'd' && argrest[1] == 0)
3199 {
3200 perl_start_option = -1;
3201 break;
3202 }
3203 #endif
3204
3205 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3206 which sets the host protocol and host name */
3207
3208 if (*argrest == 0)
3209 if (i+1 < argc)
3210 argrest = argv[++i];
3211 else
3212 { badarg = TRUE; break; }
3213
3214 if (*argrest != 0)
3215 {
3216 uschar *hn;
3217
3218 if (received_protocol)
3219 exim_fail("received_protocol is set already\n");
3220
3221 hn = Ustrchr(argrest, ':');
3222 if (hn == NULL)
3223 received_protocol = argrest;
3224 else
3225 {
3226 int old_pool = store_pool;
3227 store_pool = POOL_PERM;
3228 received_protocol = string_copyn(argrest, hn - argrest);
3229 store_pool = old_pool;
3230 sender_host_name = hn + 1;
3231 }
3232 }
3233 break;
3234
3235
3236 case 'q':
3237 receiving_message = FALSE;
3238 if (queue_interval >= 0)
3239 exim_fail("exim: -q specified more than once\n");
3240
3241 /* -qq...: Do queue runs in a 2-stage manner */
3242
3243 if (*argrest == 'q')
3244 {
3245 f.queue_2stage = TRUE;
3246 argrest++;
3247 }
3248
3249 /* -qi...: Do only first (initial) deliveries */
3250
3251 if (*argrest == 'i')
3252 {
3253 f.queue_run_first_delivery = TRUE;
3254 argrest++;
3255 }
3256
3257 /* -qf...: Run the queue, forcing deliveries
3258 -qff..: Ditto, forcing thawing as well */
3259
3260 if (*argrest == 'f')
3261 {
3262 f.queue_run_force = TRUE;
3263 if (*++argrest == 'f')
3264 {
3265 f.deliver_force_thaw = TRUE;
3266 argrest++;
3267 }
3268 }
3269
3270 /* -q[f][f]l...: Run the queue only on local deliveries */
3271
3272 if (*argrest == 'l')
3273 {
3274 f.queue_run_local = TRUE;
3275 argrest++;
3276 }
3277
3278 /* -q[f][f][l][G<name>]... Work on the named queue */
3279
3280 if (*argrest == 'G')
3281 {
3282 int i;
3283 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3284 queue_name = string_copyn(argrest, i);
3285 argrest += i;
3286 if (*argrest == '/') argrest++;
3287 }
3288
3289 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3290 only, optionally named, optionally starting from a given message id. */
3291
3292 if (!(list_queue || count_queue))
3293 if (*argrest == 0
3294 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3295 {
3296 queue_interval = 0;
3297 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3298 start_queue_run_id = argv[++i];
3299 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3300 stop_queue_run_id = argv[++i];
3301 }
3302
3303 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3304 forced, optionally local only, optionally named. */
3305
3306 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3307 0, FALSE)) <= 0)
3308 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3309 break;
3310
3311
3312 case 'R': /* Synonymous with -qR... */
3313 receiving_message = FALSE;
3314
3315 /* -Rf: As -R (below) but force all deliveries,
3316 -Rff: Ditto, but also thaw all frozen messages,
3317 -Rr: String is regex
3318 -Rrf: Regex and force
3319 -Rrff: Regex and force and thaw
3320
3321 in all cases provided there are no further characters in this
3322 argument. */
3323
3324 if (*argrest != 0)
3325 for (int i = 0; i < nelem(rsopts); i++)
3326 if (Ustrcmp(argrest, rsopts[i]) == 0)
3327 {
3328 if (i != 2) f.queue_run_force = TRUE;
3329 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3330 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3331 argrest += Ustrlen(rsopts[i]);
3332 }
3333
3334 /* -R: Set string to match in addresses for forced queue run to
3335 pick out particular messages. */
3336
3337 if (*argrest)
3338 deliver_selectstring = argrest;
3339 else if (i+1 < argc)
3340 deliver_selectstring = argv[++i];
3341 else
3342 exim_fail("exim: string expected after -R\n");
3343 break;
3344
3345
3346 /* -r: an obsolete synonym for -f (see above) */
3347
3348
3349 /* -S: Like -R but works on sender. */
3350
3351 case 'S': /* Synonymous with -qS... */
3352 receiving_message = FALSE;
3353
3354 /* -Sf: As -S (below) but force all deliveries,
3355 -Sff: Ditto, but also thaw all frozen messages,
3356 -Sr: String is regex
3357 -Srf: Regex and force
3358 -Srff: Regex and force and thaw
3359
3360 in all cases provided there are no further characters in this
3361 argument. */
3362
3363 if (*argrest)
3364 for (int i = 0; i < nelem(rsopts); i++)
3365 if (Ustrcmp(argrest, rsopts[i]) == 0)
3366 {
3367 if (i != 2) f.queue_run_force = TRUE;
3368 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3369 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3370 argrest += Ustrlen(rsopts[i]);
3371 }
3372
3373 /* -S: Set string to match in addresses for forced queue run to
3374 pick out particular messages. */
3375
3376 if (*argrest)
3377 deliver_selectstring_sender = argrest;
3378 else if (i+1 < argc)
3379 deliver_selectstring_sender = argv[++i];
3380 else
3381 exim_fail("exim: string expected after -S\n");
3382 break;
3383
3384 /* -Tqt is an option that is exclusively for use by the testing suite.
3385 It is not recognized in other circumstances. It allows for the setting up
3386 of explicit "queue times" so that various warning/retry things can be
3387 tested. Otherwise variability of clock ticks etc. cause problems. */
3388
3389 case 'T':
3390 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3391 fudged_queue_times = argv[++i];
3392 else badarg = TRUE;
3393 break;
3394
3395
3396 /* -t: Set flag to extract recipients from body of message. */
3397
3398 case 't':
3399 if (*argrest == 0) extract_recipients = TRUE;
3400
3401 /* -ti: Set flag to extract recipients from body of message, and also
3402 specify that dot does not end the message. */
3403
3404 else if (Ustrcmp(argrest, "i") == 0)
3405 {
3406 extract_recipients = TRUE;
3407 f.dot_ends = FALSE;
3408 }
3409
3410 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3411
3412 #ifndef DISABLE_TLS
3413 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3414 #endif
3415
3416 else badarg = TRUE;
3417 break;
3418
3419
3420 /* -U: This means "initial user submission" in sendmail, apparently. The
3421 doc claims that in future sendmail may refuse syntactically invalid
3422 messages instead of fixing them. For the moment, we just ignore it. */
3423
3424 case 'U':
3425 break;
3426
3427
3428 /* -v: verify things - this is a very low-level debugging */
3429
3430 case 'v':
3431 if (*argrest == 0)
3432 {
3433 debug_selector |= D_v;
3434 debug_file = stderr;
3435 }
3436 else badarg = TRUE;
3437 break;
3438
3439
3440 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3441
3442 The -x flag tells the sendmail command that mail from a local
3443 mail program has National Language Support (NLS) extended characters
3444 in the body of the mail item. The sendmail command can send mail with
3445 extended NLS characters across networks that normally corrupts these
3446 8-bit characters.
3447
3448 As Exim is 8-bit clean, it just ignores this flag. */
3449
3450 case 'x':
3451 if (*argrest != 0) badarg = TRUE;
3452 break;
3453
3454 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3455 logs to that file. We swallow the parameter and otherwise ignore it. */
3456
3457 case 'X':
3458 if (*argrest == '\0')
3459 if (++i >= argc)
3460 exim_fail("exim: string expected after -X\n");
3461 break;
3462
3463 case 'z':
3464 if (*argrest == '\0')
3465 if (++i < argc)
3466 log_oneline = argv[i];
3467 else
3468 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3469 break;
3470
3471 /* All other initial characters are errors */
3472
3473 default:
3474 badarg = TRUE;
3475 break;
3476 } /* End of high-level switch statement */
3477
3478 /* Failed to recognize the option, or syntax error */
3479
3480 if (badarg)
3481 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3482 "option %s\n", arg);
3483 }
3484
3485
3486 /* If -R or -S have been specified without -q, assume a single queue run. */
3487
3488 if ( (deliver_selectstring || deliver_selectstring_sender)
3489 && queue_interval < 0)
3490 queue_interval = 0;
3491
3492
3493 END_ARG:
3494 /* If usage_wanted is set we call the usage function - which never returns */
3495 if (usage_wanted) exim_usage(called_as);
3496
3497 /* Arguments have been processed. Check for incompatibilities. */
3498 if ((
3499 (smtp_input || extract_recipients || recipients_arg < argc) &&
3500 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3501 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3502 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3503 ) ||
3504 (
3505 msg_action_arg > 0 &&
3506 (f.daemon_listen || queue_interval > 0 || list_options ||
3507 (checking && msg_action != MSG_LOAD) ||
3508 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3509 ) ||
3510 (
3511 (f.daemon_listen || queue_interval > 0) &&
3512 (sender_address != NULL || list_options || list_queue || checking ||
3513 bi_option)
3514 ) ||
3515 (
3516 f.daemon_listen && queue_interval == 0
3517 ) ||
3518 (
3519 f.inetd_wait_mode && queue_interval >= 0
3520 ) ||
3521 (
3522 list_options &&
3523 (checking || smtp_input || extract_recipients ||
3524 filter_test != FTEST_NONE || bi_option)
3525 ) ||
3526 (
3527 verify_address_mode &&
3528 (f.address_test_mode || smtp_input || extract_recipients ||
3529 filter_test != FTEST_NONE || bi_option)
3530 ) ||
3531 (
3532 f.address_test_mode && (smtp_input || extract_recipients ||
3533 filter_test != FTEST_NONE || bi_option)
3534 ) ||
3535 (
3536 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3537 extract_recipients)
3538 ) ||
3539 (
3540 deliver_selectstring != NULL && queue_interval < 0
3541 ) ||
3542 (
3543 msg_action == MSG_LOAD &&
3544 (!expansion_test || expansion_test_message != NULL)
3545 )
3546 )
3547 exim_fail("exim: incompatible command-line options or arguments\n");
3548
3549 /* If debugging is set up, set the file and the file descriptor to pass on to
3550 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3551 to run in the foreground. */
3552
3553 if (debug_selector != 0)
3554 {
3555 debug_file = stderr;
3556 debug_fd = fileno(debug_file);
3557 f.background_daemon = FALSE;
3558 testharness_pause_ms(100); /* lets caller finish */
3559 if (debug_selector != D_v) /* -v only doesn't show this */
3560 {
3561 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3562 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3563 debug_selector);
3564 if (!version_printed)
3565 show_whats_supported(stderr);
3566 }
3567 }
3568
3569 /* When started with root privilege, ensure that the limits on the number of
3570 open files and the number of processes (where that is accessible) are
3571 sufficiently large, or are unset, in case Exim has been called from an
3572 environment where the limits are screwed down. Not all OS have the ability to
3573 change some of these limits. */
3574
3575 if (unprivileged)
3576 {
3577 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3578 }
3579 else
3580 {
3581 struct rlimit rlp;
3582
3583 #ifdef RLIMIT_NOFILE
3584 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3585 {
3586 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3587 strerror(errno));
3588 rlp.rlim_cur = rlp.rlim_max = 0;
3589 }
3590
3591 /* I originally chose 1000 as a nice big number that was unlikely to
3592 be exceeded. It turns out that some older OS have a fixed upper limit of
3593 256. */
3594
3595 if (rlp.rlim_cur < 1000)
3596 {
3597 rlp.rlim_cur = rlp.rlim_max = 1000;
3598 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3599 {
3600 rlp.rlim_cur = rlp.rlim_max = 256;
3601 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3602 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3603 strerror(errno));
3604 }
3605 }
3606 #endif
3607
3608 #ifdef RLIMIT_NPROC
3609 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3610 {
3611 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3612 strerror(errno));
3613 rlp.rlim_cur = rlp.rlim_max = 0;
3614 }
3615
3616 #ifdef RLIM_INFINITY
3617 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3618 {
3619 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3620 #else
3621 if (rlp.rlim_cur < 1000)
3622 {
3623 rlp.rlim_cur = rlp.rlim_max = 1000;
3624 #endif
3625 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3626 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3627 strerror(errno));
3628 }
3629 #endif
3630 }
3631
3632 /* Exim is normally entered as root (but some special configurations are
3633 possible that don't do this). However, it always spins off sub-processes that
3634 set their uid and gid as required for local delivery. We don't want to pass on
3635 any extra groups that root may belong to, so we want to get rid of them all at
3636 this point.
3637
3638 We need to obey setgroups() at this stage, before possibly giving up root
3639 privilege for a changed configuration file, but later on we might need to
3640 check on the additional groups for the admin user privilege - can't do that
3641 till after reading the config, which might specify the exim gid. Therefore,
3642 save the group list here first. */
3643
3644 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3645 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3646
3647 /* There is a fundamental difference in some BSD systems in the matter of
3648 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3649 known not to be different. On the "different" systems there is a single group
3650 list, and the first entry in it is the current group. On all other versions of
3651 Unix there is a supplementary group list, which is in *addition* to the current
3652 group. Consequently, to get rid of all extraneous groups on a "standard" system
3653 you pass over 0 groups to setgroups(), while on a "different" system you pass
3654 over a single group - the current group, which is always the first group in the
3655 list. Calling setgroups() with zero groups on a "different" system results in
3656 an error return. The following code should cope with both types of system.
3657
3658 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3659 the "setgroups() with zero groups" - and changes the egid.
3660 Thanks to that we had to stash the original_egid above, for use below
3661 in the call to exim_setugid().
3662
3663 However, if this process isn't running as root, setgroups() can't be used
3664 since you have to be root to run it, even if throwing away groups.
3665 Except, sigh, for Hurd - where you can.
3666 Not being root here happens only in some unusual configurations. */
3667
3668 if ( !unprivileged
3669 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3670 && setgroups(0, NULL) != 0
3671 #endif
3672 && setgroups(1, group_list) != 0)
3673 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3674
3675 /* If the configuration file name has been altered by an argument on the
3676 command line (either a new file name or a macro definition) and the caller is
3677 not root, or if this is a filter testing run, remove any setuid privilege the
3678 program has and run as the underlying user.
3679
3680 The exim user is locked out of this, which severely restricts the use of -C
3681 for some purposes.
3682
3683 Otherwise, set the real ids to the effective values (should be root unless run
3684 from inetd, which it can either be root or the exim uid, if one is configured).
3685
3686 There is a private mechanism for bypassing some of this, in order to make it
3687 possible to test lots of configurations automatically, without having either to
3688 recompile each time, or to patch in an actual configuration file name and other
3689 values (such as the path name). If running in the test harness, pretend that
3690 configuration file changes and macro definitions haven't happened. */
3691
3692 if (( /* EITHER */
3693 (!f.trusted_config || /* Config changed, or */
3694 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3695 real_uid != root_uid && /* Not root, and */
3696 !f.running_in_test_harness /* Not fudged */
3697 ) || /* OR */
3698 expansion_test /* expansion testing */
3699 || /* OR */
3700 filter_test != FTEST_NONE) /* Filter testing */
3701 {
3702 setgroups(group_count, group_list);
3703 exim_setugid(real_uid, real_gid, FALSE,
3704 US"-C, -D, -be or -bf forces real uid");
3705 removed_privilege = TRUE;
3706
3707 /* In the normal case when Exim is called like this, stderr is available
3708 and should be used for any logging information because attempts to write
3709 to the log will usually fail. To arrange this, we unset really_exim. However,
3710 if no stderr is available there is no point - we might as well have a go
3711 at the log (if it fails, syslog will be written).
3712
3713 Note that if the invoker is Exim, the logs remain available. Messing with
3714 this causes unlogged successful deliveries. */
3715
3716 if (log_stderr && real_uid != exim_uid)
3717 f.really_exim = FALSE;
3718 }
3719
3720 /* Privilege is to be retained for the moment. It may be dropped later,
3721 depending on the job that this Exim process has been asked to do. For now, set
3722 the real uid to the effective so that subsequent re-execs of Exim are done by a
3723 privileged user. */
3724
3725 else
3726 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3727
3728 /* If testing a filter, open the file(s) now, before wasting time doing other
3729 setups and reading the message. */
3730
3731 if (filter_test & FTEST_SYSTEM)
3732 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3733 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3734 strerror(errno));
3735
3736 if (filter_test & FTEST_USER)
3737 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3738 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3739 strerror(errno));
3740
3741 /* Initialise lookup_list
3742 If debugging, already called above via version reporting.
3743 In either case, we initialise the list of available lookups while running
3744 as root. All dynamically modules are loaded from a directory which is
3745 hard-coded into the binary and is code which, if not a module, would be
3746 part of Exim already. Ability to modify the content of the directory
3747 is equivalent to the ability to modify a setuid binary!
3748
3749 This needs to happen before we read the main configuration. */
3750 init_lookup_list();
3751
3752 #ifdef SUPPORT_I18N
3753 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3754 #endif
3755
3756 /* Read the main runtime configuration data; this gives up if there
3757 is a failure. It leaves the configuration file open so that the subsequent
3758 configuration data for delivery can be read if needed.
3759
3760 NOTE: immediately after opening the configuration file we change the working
3761 directory to "/"! Later we change to $spool_directory. We do it there, because
3762 during readconf_main() some expansion takes place already. */
3763
3764 /* Store the initial cwd before we change directories. Can be NULL if the
3765 dir has already been unlinked. */
3766 initial_cwd = os_getcwd(NULL, 0);
3767
3768 /* checking:
3769 -be[m] expansion test -
3770 -b[fF] filter test new
3771 -bh[c] host test -
3772 -bmalware malware_test_file new
3773 -brt retry test new
3774 -brw rewrite test new
3775 -bt address test -
3776 -bv[s] address verify -
3777 list_options:
3778 -bP <option> (except -bP config, which sets list_config)
3779
3780 If any of these options is set, we suppress warnings about configuration
3781 issues (currently about tls_advertise_hosts and keep_environment not being
3782 defined) */
3783
3784 {
3785 #ifdef MEASURE_TIMING
3786 struct timeval t0, diff;
3787 (void)gettimeofday(&t0, NULL);
3788 #endif
3789
3790 readconf_main(checking || list_options);
3791
3792 #ifdef MEASURE_TIMING
3793 report_time_since(&t0, US"readconf_main (delta)");
3794 #endif
3795 }
3796
3797
3798 /* Now in directory "/" */
3799
3800 if (cleanup_environment() == FALSE)
3801 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3802
3803
3804 /* If an action on specific messages is requested, or if a daemon or queue
3805 runner is being started, we need to know if Exim was called by an admin user.
3806 This is the case if the real user is root or exim, or if the real group is
3807 exim, or if one of the supplementary groups is exim or a group listed in
3808 admin_groups. We don't fail all message actions immediately if not admin_user,
3809 since some actions can be performed by non-admin users. Instead, set admin_user
3810 for later interrogation. */
3811
3812 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3813 f.admin_user = TRUE;
3814 else
3815 for (int i = 0; i < group_count && !f.admin_user; i++)
3816 if (group_list[i] == exim_gid)
3817 f.admin_user = TRUE;
3818 else if (admin_groups)
3819 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3820 if (admin_groups[j] == group_list[i])
3821 f.admin_user = TRUE;
3822
3823 /* Another group of privileged users are the trusted users. These are root,
3824 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3825 are permitted to specify sender_addresses with -f on the command line, and
3826 other message parameters as well. */
3827
3828 if (real_uid == root_uid || real_uid == exim_uid)
3829 f.trusted_caller = TRUE;
3830 else
3831 {
3832 if (trusted_users)
3833 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3834 if (trusted_users[i] == real_uid)
3835 f.trusted_caller = TRUE;
3836
3837 if (trusted_groups)
3838 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3839 if (trusted_groups[i] == real_gid)
3840 f.trusted_caller = TRUE;
3841 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3842 if (trusted_groups[i] == group_list[j])
3843 f.trusted_caller = TRUE;
3844 }
3845
3846 /* At this point, we know if the user is privileged and some command-line
3847 options become possibly impermissible, depending upon the configuration file. */
3848
3849 if (checking && commandline_checks_require_admin && !f.admin_user)
3850 exim_fail("exim: those command-line flags are set to require admin\n");
3851
3852 /* Handle the decoding of logging options. */
3853
3854 decode_bits(log_selector, log_selector_size, log_notall,
3855 log_selector_string, log_options, log_options_count, US"log", 0);
3856
3857 DEBUG(D_any)
3858 {
3859 debug_printf("configuration file is %s\n", config_main_filename);
3860 debug_printf("log selectors =");
3861 for (int i = 0; i < log_selector_size; i++)
3862 debug_printf(" %08x", log_selector[i]);
3863 debug_printf("\n");
3864 }
3865
3866 /* If domain literals are not allowed, check the sender address that was
3867 supplied with -f. Ditto for a stripped trailing dot. */
3868
3869 if (sender_address)
3870 {
3871 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3872 exim_fail("exim: bad -f address \"%s\": domain literals not "
3873 "allowed\n", sender_address);
3874 if (f_end_dot && !strip_trailing_dot)
3875 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3876 "(trailing dot not allowed)\n", sender_address);
3877 }
3878
3879 /* See if an admin user overrode our logging. */
3880
3881 if (cmdline_syslog_name)
3882 if (f.admin_user)
3883 {
3884 syslog_processname = cmdline_syslog_name;
3885 log_file_path = string_copy(CUS"syslog");
3886 }
3887 else
3888 /* not a panic, non-privileged users should not be able to spam paniclog */
3889 exim_fail(
3890 "exim: you lack sufficient privilege to specify syslog process name\n");
3891
3892 /* Paranoia check of maximum lengths of certain strings. There is a check
3893 on the length of the log file path in log.c, which will come into effect
3894 if there are any calls to write the log earlier than this. However, if we
3895 get this far but the string is very long, it is better to stop now than to
3896 carry on and (e.g.) receive a message and then have to collapse. The call to
3897 log_write() from here will cause the ultimate panic collapse if the complete
3898 file name exceeds the buffer length. */
3899
3900 if (Ustrlen(log_file_path) > 200)
3901 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3902 "log_file_path is longer than 200 chars: aborting");
3903
3904 if (Ustrlen(pid_file_path) > 200)
3905 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3906 "pid_file_path is longer than 200 chars: aborting");
3907
3908 if (Ustrlen(spool_directory) > 200)
3909 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3910 "spool_directory is longer than 200 chars: aborting");
3911
3912 /* Length check on the process name given to syslog for its TAG field,
3913 which is only permitted to be 32 characters or less. See RFC 3164. */
3914
3915 if (Ustrlen(syslog_processname) > 32)
3916 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3917 "syslog_processname is longer than 32 chars: aborting");
3918
3919 if (log_oneline)
3920 if (f.admin_user)
3921 {
3922 log_write(0, LOG_MAIN, "%s", log_oneline);
3923 return EXIT_SUCCESS;
3924 }
3925 else
3926 return EXIT_FAILURE;
3927
3928 /* In some operating systems, the environment variable TMPDIR controls where
3929 temporary files are created; Exim doesn't use these (apart from when delivering
3930 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3931 If TMPDIR is found in the environment, reset it to the value defined in the
3932 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3933 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3934 EXIM_TMPDIR by the build scripts.
3935 */
3936
3937 #ifdef EXIM_TMPDIR
3938 if (environ) for (uschar ** p = USS environ; *p; p++)
3939 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3940 {
3941 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3942 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3943 *p = newp;
3944 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3945 }
3946 #endif
3947
3948 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3949 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3950 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3951 called by a user who has set the TZ variable. This then affects the timestamps
3952 in log files and in Received: headers, and any created Date: header lines. The
3953 required timezone is settable in the configuration file, so nothing can be done
3954 about this earlier - but hopefully nothing will normally be logged earlier than
3955 this. We have to make a new environment if TZ is wrong, but don't bother if
3956 timestamps_utc is set, because then all times are in UTC anyway. */
3957
3958 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3959 f.timestamps_utc = TRUE;
3960 else
3961 {
3962 uschar *envtz = US getenv("TZ");
3963 if (envtz
3964 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3965 : timezone_string != NULL
3966 )
3967 {
3968 uschar **p = USS environ;
3969 uschar **new;
3970 uschar **newp;
3971 int count = 0;
3972 if (environ) while (*p++) count++;
3973 if (!envtz) count++;
3974 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3975 if (environ) for (p = USS environ; *p; p++)
3976 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3977 if (timezone_string)
3978 {
3979 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3980 sprintf(CS *newp++, "TZ=%s", timezone_string);
3981 }
3982 *newp = NULL;
3983 environ = CSS new;
3984 tzset();
3985 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3986 tod_stamp(tod_log));
3987 }
3988 }
3989
3990 /* Handle the case when we have removed the setuid privilege because of -C or
3991 -D. This means that the caller of Exim was not root.
3992
3993 There is a problem if we were running as the Exim user. The sysadmin may
3994 expect this case to retain privilege because "the binary was called by the
3995 Exim user", but it hasn't, because either the -D option set macros, or the
3996 -C option set a non-trusted configuration file. There are two possibilities:
3997
3998 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3999 to do message deliveries. Thus, the fact that it is running as a
4000 non-privileged user is plausible, and might be wanted in some special
4001 configurations. However, really_exim will have been set false when
4002 privilege was dropped, to stop Exim trying to write to its normal log
4003 files. Therefore, re-enable normal log processing, assuming the sysadmin
4004 has set up the log directory correctly.
4005
4006 (2) If deliver_drop_privilege is not set, the configuration won't work as
4007 apparently intended, and so we log a panic message. In order to retain
4008 root for -C or -D, the caller must either be root or be invoking a
4009 trusted configuration file (when deliver_drop_privilege is false). */
4010
4011 if ( removed_privilege
4012 && (!f.trusted_config || opt_D_used)
4013 && real_uid == exim_uid)
4014 if (deliver_drop_privilege)
4015 f.really_exim = TRUE; /* let logging work normally */
4016 else
4017 log_write(0, LOG_MAIN|LOG_PANIC,
4018 "exim user lost privilege for using %s option",
4019 f.trusted_config? "-D" : "-C");
4020
4021 /* Start up Perl interpreter if Perl support is configured and there is a
4022 perl_startup option, and the configuration or the command line specifies
4023 initializing starting. Note that the global variables are actually called
4024 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4025
4026 #ifdef EXIM_PERL
4027 if (perl_start_option != 0)
4028 opt_perl_at_start = (perl_start_option > 0);
4029 if (opt_perl_at_start && opt_perl_startup != NULL)
4030 {
4031 uschar *errstr;
4032 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4033 if ((errstr = init_perl(opt_perl_startup)))
4034 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4035 opt_perl_started = TRUE;
4036 }
4037 #endif /* EXIM_PERL */
4038
4039 /* Log the arguments of the call if the configuration file said so. This is
4040 a debugging feature for finding out what arguments certain MUAs actually use.
4041 Don't attempt it if logging is disabled, or if listing variables or if
4042 verifying/testing addresses or expansions. */
4043
4044 if ( (debug_selector & D_any || LOGGING(arguments))
4045 && f.really_exim && !list_options && !checking)
4046 {
4047 uschar *p = big_buffer;
4048 Ustrcpy(p, US"cwd= (failed)");
4049
4050 if (!initial_cwd)
4051 p += 13;
4052 else
4053 {
4054 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4055 p += 4 + Ustrlen(initial_cwd);
4056 /* in case p is near the end and we don't provide enough space for
4057 * string_format to be willing to write. */
4058 *p = '\0';
4059 }
4060
4061 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4062 while (*p) p++;
4063 for (int i = 0; i < argc; i++)
4064 {
4065 int len = Ustrlen(argv[i]);
4066 const uschar *printing;
4067 uschar *quote;
4068 if (p + len + 8 >= big_buffer + big_buffer_size)
4069 {
4070 Ustrcpy(p, US" ...");
4071 log_write(0, LOG_MAIN, "%s", big_buffer);
4072 Ustrcpy(big_buffer, US"...");
4073 p = big_buffer + 3;
4074 }
4075 printing = string_printing(argv[i]);
4076 if (printing[0] == 0) quote = US"\""; else
4077 {
4078 const uschar *pp = printing;
4079 quote = US"";
4080 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
4081 }
4082 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4083 (p - big_buffer) - 4), printing, quote);
4084 }
4085
4086 if (LOGGING(arguments))
4087 log_write(0, LOG_MAIN, "%s", big_buffer);
4088 else
4089 debug_printf("%s\n", big_buffer);
4090 }
4091
4092 /* Set the working directory to be the top-level spool directory. We don't rely
4093 on this in the code, which always uses fully qualified names, but it's useful
4094 for core dumps etc. Don't complain if it fails - the spool directory might not
4095 be generally accessible and calls with the -C option (and others)