06e01399a5755e5d37b09dd11243224a8fe42fae
[exim.git] / src / src / exim.c
1 /* $Cambridge: exim/src/src/exim.c,v 1.24 2005/08/09 13:31:52 ph10 Exp $ */
2
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
6
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
9
10
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
13
14
15 #include "exim.h"
16
17
18
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
22
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
30
31 static void *
32 function_store_get(size_t size)
33 {
34 return store_get((int)size);
35 }
36
37 static void
38 function_dummy_free(void *block) { block = block; }
39
40 static void *
41 function_store_malloc(size_t size)
42 {
43 return store_malloc((int)size);
44 }
45
46 static void
47 function_store_free(void *block)
48 {
49 store_free(block);
50 }
51
52
53
54
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
58
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
64
65 Argument:
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
69
70 Returns: pointer to the compiled pattern
71 */
72
73 const pcre *
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
75 {
76 int offset;
77 int options = PCRE_COPT;
78 const pcre *yield;
79 const uschar *error;
80 if (use_malloc)
81 {
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
84 }
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
89 if (yield == NULL)
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
92 return yield;
93 }
94
95
96
97
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
101
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
104
105 Arguments:
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
112
113 Returns: TRUE or FALSE
114 */
115
116 BOOL
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
118 {
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
122 BOOL yield = n >= 0;
123 if (n == 0) n = EXPAND_MAXN + 1;
124 if (yield)
125 {
126 int nn;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
129 {
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
132 }
133 expand_nmax--;
134 }
135 return yield;
136 }
137
138
139
140
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
144
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
149
150 Argument: the signal number (SIGUSR1)
151 Returns: nothing
152 */
153
154 static void
155 usr1_handler(int sig)
156 {
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
159 log_close_all();
160 os_restarting_signal(SIGUSR1, usr1_handler);
161 }
162
163
164
165 /*************************************************
166 * Timeout handler *
167 *************************************************/
168
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
172 re-enables itself.
173
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
178
179 Argument: the signal value (SIGALRM)
180 Returns: nothing
181 */
182
183 void
184 sigalrm_handler(int sig)
185 {
186 sig = sig; /* Keep picky compilers happy */
187 sigalrm_seen = TRUE;
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
189 }
190
191
192
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
196
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
203
204 Argument: an itimerval structure containing the interval
205 Returns: nothing
206 */
207
208 static void
209 milliwait(struct itimerval *itval)
210 {
211 sigset_t sigmask;
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
223 }
224
225
226
227
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
231
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
234 spammers.
235
236 Argument: number of millseconds
237 Returns: nothing
238 */
239
240 void
241 millisleep(int msec)
242 {
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
248 milliwait(&itval);
249 }
250
251
252
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
256
257 /*
258 Arguments:
259 tv1 the first time
260 tv2 the second time
261
262 Returns: -1, 0, or +1
263 */
264
265 int
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
267 {
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
272 return 0;
273 }
274
275
276
277
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
281
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
291
292 Arguments:
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
298
299 Returns: nothing
300 */
301
302 void
303 exim_wait_tick(struct timeval *then_tv, int resolution)
304 {
305 struct timeval now_tv;
306 long int now_true_usec;
307
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
311
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
313 {
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
319
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
324
325 if (itval.it_value.tv_usec < 0)
326 {
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
329 }
330
331 DEBUG(D_transport|D_receive)
332 {
333 if (!running_in_test_harness)
334 {
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
339 }
340 }
341
342 milliwait(&itval);
343 }
344 }
345
346
347
348
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
352
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
355
356 Arguments: format and arguments, as for printf()
357 Returns: nothing
358 */
359
360 void
361 set_process_info(char *format, ...)
362 {
363 int len;
364 va_list ap;
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
371 va_end(ap);
372 }
373
374
375
376
377
378 /*************************************************
379 * Ensure stdin, stdout, and stderr exist *
380 *************************************************/
381
382 /* Some operating systems grumble if an exec() happens without a standard
383 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
384 file will be opened and will use these fd values, and then some other bit of
385 code will assume, for example, that it can write error messages to stderr.
386 This function ensures that fds 0, 1, and 2 are open if they do not already
387 exist, by connecting them to /dev/null.
388
389 This function is also used to ensure that std{in,out,err} exist at all times,
390 so that if any library that Exim calls tries to use them, it doesn't crash.
391
392 Arguments: None
393 Returns: Nothing
394 */
395
396 void
397 exim_nullstd(void)
398 {
399 int i;
400 int devnull = -1;
401 struct stat statbuf;
402 for (i = 0; i <= 2; i++)
403 {
404 if (fstat(i, &statbuf) < 0 && errno == EBADF)
405 {
406 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
407 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
408 string_open_failed(errno, "/dev/null"));
409 if (devnull != i) (void)dup2(devnull, i);
410 }
411 }
412 if (devnull > 2) (void)close(devnull);
413 }
414
415
416
417
418 /*************************************************
419 * Close unwanted file descriptors for delivery *
420 *************************************************/
421
422 /* This function is called from a new process that has been forked to deliver
423 an incoming message, either directly, or using exec.
424
425 We want any smtp input streams to be closed in this new process. However, it
426 has been observed that using fclose() here causes trouble. When reading in -bS
427 input, duplicate copies of messages have been seen. The files will be sharing a
428 file pointer with the parent process, and it seems that fclose() (at least on
429 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
430 least sometimes. Hence we go for closing the underlying file descriptors.
431
432 If TLS is active, we want to shut down the TLS library, but without molesting
433 the parent's SSL connection.
434
435 For delivery of a non-SMTP message, we want to close stdin and stdout (and
436 stderr unless debugging) because the calling process might have set them up as
437 pipes and be waiting for them to close before it waits for the submission
438 process to terminate. If they aren't closed, they hold up the calling process
439 until the initial delivery process finishes, which is not what we want.
440
441 Exception: We do want it for synchronous delivery!
442
443 And notwithstanding all the above, if D_resolver is set, implying resolver
444 debugging, leave stdout open, because that's where the resolver writes its
445 debugging output.
446
447 When we close stderr (which implies we've also closed stdout), we also get rid
448 of any controlling terminal.
449
450 Arguments: None
451 Returns: Nothing
452 */
453
454 static void
455 close_unwanted(void)
456 {
457 if (smtp_input)
458 {
459 #ifdef SUPPORT_TLS
460 tls_close(FALSE); /* Shut down the TLS library */
461 #endif
462 (void)close(fileno(smtp_in));
463 (void)close(fileno(smtp_out));
464 smtp_in = NULL;
465 }
466 else
467 {
468 (void)close(0); /* stdin */
469 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
470 if (debug_selector == 0) /* stderr */
471 {
472 if (!synchronous_delivery)
473 {
474 (void)close(2);
475 log_stderr = NULL;
476 }
477 (void)setsid();
478 }
479 }
480 }
481
482
483
484
485 /*************************************************
486 * Set uid and gid *
487 *************************************************/
488
489 /* This function sets a new uid and gid permanently, optionally calling
490 initgroups() to set auxiliary groups. There are some special cases when running
491 Exim in unprivileged modes. In these situations the effective uid will not be
492 root; if we already have the right effective uid/gid, and don't need to
493 initialize any groups, leave things as they are.
494
495 Arguments:
496 uid the uid
497 gid the gid
498 igflag TRUE if initgroups() wanted
499 msg text to use in debugging output and failure log
500
501 Returns: nothing; bombs out on failure
502 */
503
504 void
505 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
506 {
507 uid_t euid = geteuid();
508 gid_t egid = getegid();
509
510 if (euid == root_uid || euid != uid || egid != gid || igflag)
511 {
512 /* At least one OS returns +1 for initgroups failure, so just check for
513 non-zero. */
514
515 if (igflag)
516 {
517 struct passwd *pw = getpwuid(uid);
518 if (pw != NULL)
519 {
520 if (initgroups(pw->pw_name, gid) != 0)
521 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
522 (long int)uid, strerror(errno));
523 }
524 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
525 "no passwd entry for uid=%ld", (long int)uid);
526 }
527
528 if (setgid(gid) < 0 || setuid(uid) < 0)
529 {
530 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
531 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
532 }
533 }
534
535 /* Debugging output included uid/gid and all groups */
536
537 DEBUG(D_uid)
538 {
539 int group_count;
540 gid_t group_list[NGROUPS_MAX];
541 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
542 (long int)geteuid(), (long int)getegid(), (long int)getpid());
543 group_count = getgroups(NGROUPS_MAX, group_list);
544 debug_printf(" auxiliary group list:");
545 if (group_count > 0)
546 {
547 int i;
548 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
549 }
550 else debug_printf(" <none>");
551 debug_printf("\n");
552 }
553 }
554
555
556
557
558 /*************************************************
559 * Exit point *
560 *************************************************/
561
562 /* Exim exits via this function so that it always clears up any open
563 databases.
564
565 Arguments:
566 rc return code
567
568 Returns: does not return
569 */
570
571 void
572 exim_exit(int rc)
573 {
574 search_tidyup();
575 DEBUG(D_any)
576 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
577 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
578 exit(rc);
579 }
580
581
582
583
584 /*************************************************
585 * Extract port from host address *
586 *************************************************/
587
588 /* Called to extract the port from the values given to -oMa and -oMi.
589 It also checks the syntax of the address, and terminates it before the
590 port data when a port is extracted.
591
592 Argument:
593 address the address, with possible port on the end
594
595 Returns: the port, or zero if there isn't one
596 bombs out on a syntax error
597 */
598
599 static int
600 check_port(uschar *address)
601 {
602 int port = host_address_extract_port(address);
603 if (string_is_ip_address(address, NULL) == 0)
604 {
605 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
606 exit(EXIT_FAILURE);
607 }
608 return port;
609 }
610
611
612
613 /*************************************************
614 * Test/verify an address *
615 *************************************************/
616
617 /* This function is called by the -bv and -bt code. It extracts a working
618 address from a full RFC 822 address. This isn't really necessary per se, but it
619 has the effect of collapsing source routes.
620
621 Arguments:
622 s the address string
623 flags flag bits for verify_address()
624 exit_value to be set for failures
625
626 Returns: nothing
627 */
628
629 static void
630 test_address(uschar *s, int flags, int *exit_value)
631 {
632 int start, end, domain;
633 uschar *parse_error = NULL;
634 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
635 FALSE);
636 if (address == NULL)
637 {
638 fprintf(stdout, "syntax error: %s\n", parse_error);
639 *exit_value = 2;
640 }
641 else
642 {
643 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
644 -1, -1, NULL, NULL, NULL);
645 if (rc == FAIL) *exit_value = 2;
646 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
647 }
648 }
649
650
651
652 /*************************************************
653 * Decode bit settings for log/debug *
654 *************************************************/
655
656 /* This function decodes a string containing bit settings in the form of +name
657 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
658 also recognizes a numeric setting of the form =<number>, but this is not
659 intended for user use. It's an easy way for Exim to pass the debug settings
660 when it is re-exec'ed.
661
662 The log options are held in two unsigned ints (because there became too many
663 for one). The top bit in the table means "put in 2nd selector". This does not
664 yet apply to debug options, so the "=" facility sets only the first selector.
665
666 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
667 It sets all the bits in both selectors. However, there is a facility for then
668 unsetting certain bits, because we want to turn off "memory" in the debug case.
669
670 A bad value for a debug setting is treated as an unknown option - error message
671 to stderr and die. For log settings, which come from the configuration file,
672 we write to the log on the way out...
673
674 Arguments:
675 selector1 address of the first bit string
676 selector2 address of the second bit string, or NULL
677 notall1 bits to exclude from "all" for selector1
678 notall2 bits to exclude from "all" for selector2
679 string the configured string
680 options the table of option names
681 count size of table
682 which "log" or "debug"
683
684 Returns: nothing on success - bomb out on failure
685 */
686
687 static void
688 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
689 int notall2, uschar *string, bit_table *options, int count, uschar *which)
690 {
691 uschar *errmsg;
692 if (string == NULL) return;
693
694 if (*string == '=')
695 {
696 char *end; /* Not uschar */
697 *selector1 = strtoul(CS string+1, &end, 0);
698 if (*end == 0) return;
699 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
700 string);
701 goto ERROR_RETURN;
702 }
703
704 /* Handle symbolic setting */
705
706 else for(;;)
707 {
708 BOOL adding;
709 uschar *s;
710 int len;
711 bit_table *start, *end;
712
713 while (isspace(*string)) string++;
714 if (*string == 0) return;
715
716 if (*string != '+' && *string != '-')
717 {
718 errmsg = string_sprintf("malformed %s_selector setting: "
719 "+ or - expected but found \"%s\"", which, string);
720 goto ERROR_RETURN;
721 }
722
723 adding = *string++ == '+';
724 s = string;
725 while (isalnum(*string) || *string == '_') string++;
726 len = string - s;
727
728 start = options;
729 end = options + count;
730
731 while (start < end)
732 {
733 bit_table *middle = start + (end - start)/2;
734 int c = Ustrncmp(s, middle->name, len);
735 if (c == 0)
736 {
737 if (middle->name[len] != 0) c = -1; else
738 {
739 unsigned int bit = middle->bit;
740 unsigned int *selector;
741
742 /* The value with all bits set means "force all bits in both selectors"
743 in the case where two are being handled. However, the top bit in the
744 second selector is never set. When setting, some bits can be excluded.
745 */
746
747 if (bit == 0xffffffff)
748 {
749 if (adding)
750 {
751 *selector1 = 0xffffffff ^ notall1;
752 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
753 }
754 else
755 {
756 *selector1 = 0;
757 if (selector2 != NULL) *selector2 = 0;
758 }
759 }
760
761 /* Otherwise, the 0x80000000 bit means "this value, without the top
762 bit, belongs in the second selector". */
763
764 else
765 {
766 if ((bit & 0x80000000) != 0)
767 {
768 selector = selector2;
769 bit &= 0x7fffffff;
770 }
771 else selector = selector1;
772 if (adding) *selector |= bit; else *selector &= ~bit;
773 }
774 break; /* Out of loop to match selector name */
775 }
776 }
777 if (c < 0) end = middle; else start = middle + 1;
778 } /* Loop to match selector name */
779
780 if (start >= end)
781 {
782 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
783 adding? '+' : '-', len, s);
784 goto ERROR_RETURN;
785 }
786 } /* Loop for selector names */
787
788 /* Handle disasters */
789
790 ERROR_RETURN:
791 if (Ustrcmp(which, "debug") == 0)
792 {
793 fprintf(stderr, "exim: %s\n", errmsg);
794 exit(EXIT_FAILURE);
795 }
796 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
797 }
798
799
800
801 /*************************************************
802 * Show supported features *
803 *************************************************/
804
805 /* This function is called for -bV and for -d to output the optional features
806 of the current Exim binary.
807
808 Arguments: a FILE for printing
809 Returns: nothing
810 */
811
812 static void
813 show_whats_supported(FILE *f)
814 {
815 #ifdef DB_VERSION_STRING
816 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
817 #elif defined(BTREEVERSION) && defined(HASHVERSION)
818 #ifdef USE_DB
819 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
820 #else
821 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
822 #endif
823 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
824 fprintf(f, "Probably ndbm\n");
825 #elif defined(USE_TDB)
826 fprintf(f, "Using tdb\n");
827 #else
828 #ifdef USE_GDBM
829 fprintf(f, "Probably GDBM (native mode)\n");
830 #else
831 fprintf(f, "Probably GDBM (compatibility mode)\n");
832 #endif
833 #endif
834
835 fprintf(f, "Support for:");
836 #if HAVE_ICONV
837 fprintf(f, " iconv()");
838 #endif
839 #if HAVE_IPV6
840 fprintf(f, " IPv6");
841 #endif
842 #ifdef SUPPORT_PAM
843 fprintf(f, " PAM");
844 #endif
845 #ifdef EXIM_PERL
846 fprintf(f, " Perl");
847 #endif
848 #ifdef EXPAND_DLFUNC
849 fprintf(f, " Expand_dlfunc");
850 #endif
851 #ifdef USE_TCP_WRAPPERS
852 fprintf(f, " TCPwrappers");
853 #endif
854 #ifdef SUPPORT_TLS
855 #ifdef USE_GNUTLS
856 fprintf(f, " GnuTLS");
857 #else
858 fprintf(f, " OpenSSL");
859 #endif
860 #endif
861 #ifdef WITH_CONTENT_SCAN
862 fprintf(f, " Content_Scanning");
863 #endif
864 #ifdef WITH_OLD_DEMIME
865 fprintf(f, " Old_Demime");
866 #endif
867 #ifdef EXPERIMENTAL_SPF
868 fprintf(f, " Experimental_SPF");
869 #endif
870 #ifdef EXPERIMENTAL_SRS
871 fprintf(f, " Experimental_SRS");
872 #endif
873 #ifdef EXPERIMENTAL_BRIGHTMAIL
874 fprintf(f, " Experimental_Brightmail");
875 #endif
876 #ifdef EXPERIMENTAL_DOMAINKEYS
877 fprintf(f, " Experimental_DomainKeys");
878 #endif
879 fprintf(f, "\n");
880
881 fprintf(f, "Lookups:");
882 #ifdef LOOKUP_LSEARCH
883 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
884 #endif
885 #ifdef LOOKUP_CDB
886 fprintf(f, " cdb");
887 #endif
888 #ifdef LOOKUP_DBM
889 fprintf(f, " dbm dbmnz");
890 #endif
891 #ifdef LOOKUP_DNSDB
892 fprintf(f, " dnsdb");
893 #endif
894 #ifdef LOOKUP_DSEARCH
895 fprintf(f, " dsearch");
896 #endif
897 #ifdef LOOKUP_IBASE
898 fprintf(f, " ibase");
899 #endif
900 #ifdef LOOKUP_LDAP
901 fprintf(f, " ldap ldapdn ldapm");
902 #endif
903 #ifdef LOOKUP_MYSQL
904 fprintf(f, " mysql");
905 #endif
906 #ifdef LOOKUP_NIS
907 fprintf(f, " nis nis0");
908 #endif
909 #ifdef LOOKUP_NISPLUS
910 fprintf(f, " nisplus");
911 #endif
912 #ifdef LOOKUP_ORACLE
913 fprintf(f, " oracle");
914 #endif
915 #ifdef LOOKUP_PASSWD
916 fprintf(f, " passwd");
917 #endif
918 #ifdef LOOKUP_PGSQL
919 fprintf(f, " pgsql");
920 #endif
921 #ifdef LOOKUP_SQLITE
922 fprintf(f, " sqlite");
923 #endif
924 #ifdef LOOKUP_TESTDB
925 fprintf(f, " testdb");
926 #endif
927 #ifdef LOOKUP_WHOSON
928 fprintf(f, " whoson");
929 #endif
930 fprintf(f, "\n");
931
932 fprintf(f, "Authenticators:");
933 #ifdef AUTH_CRAM_MD5
934 fprintf(f, " cram_md5");
935 #endif
936 #ifdef AUTH_CYRUS_SASL
937 fprintf(f, " cyrus_sasl");
938 #endif
939 #ifdef AUTH_PLAINTEXT
940 fprintf(f, " plaintext");
941 #endif
942 #ifdef AUTH_SPA
943 fprintf(f, " spa");
944 #endif
945 fprintf(f, "\n");
946
947 fprintf(f, "Routers:");
948 #ifdef ROUTER_ACCEPT
949 fprintf(f, " accept");
950 #endif
951 #ifdef ROUTER_DNSLOOKUP
952 fprintf(f, " dnslookup");
953 #endif
954 #ifdef ROUTER_IPLITERAL
955 fprintf(f, " ipliteral");
956 #endif
957 #ifdef ROUTER_IPLOOKUP
958 fprintf(f, " iplookup");
959 #endif
960 #ifdef ROUTER_MANUALROUTE
961 fprintf(f, " manualroute");
962 #endif
963 #ifdef ROUTER_QUERYPROGRAM
964 fprintf(f, " queryprogram");
965 #endif
966 #ifdef ROUTER_REDIRECT
967 fprintf(f, " redirect");
968 #endif
969 fprintf(f, "\n");
970
971 fprintf(f, "Transports:");
972 #ifdef TRANSPORT_APPENDFILE
973 fprintf(f, " appendfile");
974 #ifdef SUPPORT_MAILDIR
975 fprintf(f, "/maildir");
976 #endif
977 #ifdef SUPPORT_MAILSTORE
978 fprintf(f, "/mailstore");
979 #endif
980 #ifdef SUPPORT_MBX
981 fprintf(f, "/mbx");
982 #endif
983 #endif
984 #ifdef TRANSPORT_AUTOREPLY
985 fprintf(f, " autoreply");
986 #endif
987 #ifdef TRANSPORT_LMTP
988 fprintf(f, " lmtp");
989 #endif
990 #ifdef TRANSPORT_PIPE
991 fprintf(f, " pipe");
992 #endif
993 #ifdef TRANSPORT_SMTP
994 fprintf(f, " smtp");
995 #endif
996 fprintf(f, "\n");
997
998 if (fixed_never_users[0] > 0)
999 {
1000 int i;
1001 fprintf(f, "Fixed never_users: ");
1002 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1003 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1004 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1005 }
1006 }
1007
1008
1009
1010
1011 /*************************************************
1012 * Quote a local part *
1013 *************************************************/
1014
1015 /* This function is used when a sender address or a From: or Sender: header
1016 line is being created from the caller's login, or from an authenticated_id. It
1017 applies appropriate quoting rules for a local part.
1018
1019 Argument: the local part
1020 Returns: the local part, quoted if necessary
1021 */
1022
1023 uschar *
1024 local_part_quote(uschar *lpart)
1025 {
1026 BOOL needs_quote = FALSE;
1027 int size, ptr;
1028 uschar *yield;
1029 uschar *t;
1030
1031 for (t = lpart; !needs_quote && *t != 0; t++)
1032 {
1033 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1034 (*t != '.' || t == lpart || t[1] == 0);
1035 }
1036
1037 if (!needs_quote) return lpart;
1038
1039 size = ptr = 0;
1040 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1041
1042 for (;;)
1043 {
1044 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1045 if (nq == NULL)
1046 {
1047 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1048 break;
1049 }
1050 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1051 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1052 yield = string_cat(yield, &size, &ptr, nq, 1);
1053 lpart = nq + 1;
1054 }
1055
1056 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1057 yield[ptr] = 0;
1058 return yield;
1059 }
1060
1061
1062
1063 #ifdef USE_READLINE
1064 /*************************************************
1065 * Load readline() functions *
1066 *************************************************/
1067
1068 /* This function is called from testing executions that read data from stdin,
1069 but only when running as the calling user. Currently, only -be does this. The
1070 function loads the readline() function library and passes back the functions.
1071 On some systems, it needs the curses library, so load that too, but try without
1072 it if loading fails. All this functionality has to be requested at build time.
1073
1074 Arguments:
1075 fn_readline_ptr pointer to where to put the readline pointer
1076 fn_addhist_ptr pointer to where to put the addhistory function
1077
1078 Returns: the dlopen handle or NULL on failure
1079 */
1080
1081 static void *
1082 set_readline(char * (**fn_readline_ptr)(char *),
1083 char * (**fn_addhist_ptr)(char *))
1084 {
1085 void *dlhandle;
1086 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1087
1088 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1089 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1090
1091 if (dlhandle != NULL)
1092 {
1093 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1094 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1095 }
1096 else
1097 {
1098 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1099 }
1100
1101 return dlhandle;
1102 }
1103 #endif
1104
1105
1106
1107 /*************************************************
1108 * Get a line from stdin for testing things *
1109 *************************************************/
1110
1111 /* This function is called when running tests that can take a number of lines
1112 of input (for example, -be and -bt). It handles continuations and trailing
1113 spaces. And prompting and a blank line output on eof. If readline() is in use,
1114 the arguments are non-NULL and provide the relevant functions.
1115
1116 Arguments:
1117 fn_readline readline function or NULL
1118 fn_addhist addhist function or NULL
1119
1120 Returns: pointer to dynamic memory, or NULL at end of file
1121 */
1122
1123 static uschar *
1124 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1125 {
1126 int i;
1127 int size = 0;
1128 int ptr = 0;
1129 uschar *yield = NULL;
1130
1131 if (fn_readline == NULL) printf("> ");
1132
1133 for (i = 0;; i++)
1134 {
1135 uschar buffer[1024];
1136 uschar *p, *ss;
1137
1138 #ifdef USE_READLINE
1139 char *readline_line = NULL;
1140 if (fn_readline != NULL)
1141 {
1142 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1143 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1144 p = US readline_line;
1145 }
1146 else
1147 #endif
1148
1149 /* readline() not in use */
1150
1151 {
1152 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1153 p = buffer;
1154 }
1155
1156 /* Handle the line */
1157
1158 ss = p + (int)Ustrlen(p);
1159 while (ss > p && isspace(ss[-1])) ss--;
1160
1161 if (i > 0)
1162 {
1163 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1164 }
1165
1166 yield = string_cat(yield, &size, &ptr, p, ss - p);
1167
1168 #ifdef USE_READLINE
1169 if (fn_readline != NULL) free(readline_line);
1170 #endif
1171
1172 if (ss == p || yield[ptr-1] != '\\')
1173 {
1174 yield[ptr] = 0;
1175 break;
1176 }
1177 yield[--ptr] = 0;
1178 }
1179
1180 if (yield == NULL) printf("\n");
1181 return yield;
1182 }
1183
1184
1185
1186 /*************************************************
1187 * Entry point and high-level code *
1188 *************************************************/
1189
1190 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1191 the appropriate action. All the necessary functions are present in the one
1192 binary. I originally thought one should split it up, but it turns out that so
1193 much of the apparatus is needed in each chunk that one might as well just have
1194 it all available all the time, which then makes the coding easier as well.
1195
1196 Arguments:
1197 argc count of entries in argv
1198 argv argument strings, with argv[0] being the program name
1199
1200 Returns: EXIT_SUCCESS if terminated successfully
1201 EXIT_FAILURE otherwise, except when a message has been sent
1202 to the sender, and -oee was given
1203 */
1204
1205 int
1206 main(int argc, char **cargv)
1207 {
1208 uschar **argv = USS cargv;
1209 int arg_receive_timeout = -1;
1210 int arg_smtp_receive_timeout = -1;
1211 int arg_error_handling = error_handling;
1212 int filter_sfd = -1;
1213 int filter_ufd = -1;
1214 int group_count;
1215 int i;
1216 int list_queue_option = 0;
1217 int msg_action = 0;
1218 int msg_action_arg = -1;
1219 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1220 int queue_only_reason = 0;
1221 #ifdef EXIM_PERL
1222 int perl_start_option = 0;
1223 #endif
1224 int recipients_arg = argc;
1225 int sender_address_domain = 0;
1226 int test_retry_arg = -1;
1227 int test_rewrite_arg = -1;
1228 BOOL arg_queue_only = FALSE;
1229 BOOL bi_option = FALSE;
1230 BOOL checking = FALSE;
1231 BOOL count_queue = FALSE;
1232 BOOL expansion_test = FALSE;
1233 BOOL extract_recipients = FALSE;
1234 BOOL forced_delivery = FALSE;
1235 BOOL f_end_dot = FALSE;
1236 BOOL deliver_give_up = FALSE;
1237 BOOL list_queue = FALSE;
1238 BOOL list_options = FALSE;
1239 BOOL local_queue_only;
1240 BOOL more = TRUE;
1241 BOOL one_msg_action = FALSE;
1242 BOOL queue_only_set = FALSE;
1243 BOOL receiving_message = TRUE;
1244 BOOL unprivileged;
1245 BOOL removed_privilege = FALSE;
1246 BOOL verify_address_mode = FALSE;
1247 BOOL verify_as_sender = FALSE;
1248 BOOL version_printed = FALSE;
1249 uschar *alias_arg = NULL;
1250 uschar *called_as = US"";
1251 uschar *start_queue_run_id = NULL;
1252 uschar *stop_queue_run_id = NULL;
1253 uschar *ftest_domain = NULL;
1254 uschar *ftest_localpart = NULL;
1255 uschar *ftest_prefix = NULL;
1256 uschar *ftest_suffix = NULL;
1257 uschar *real_sender_address;
1258 uschar *originator_home = US"/";
1259 void *reset_point;
1260
1261 struct passwd *pw;
1262 struct stat statbuf;
1263 pid_t passed_qr_pid = (pid_t)0;
1264 int passed_qr_pipe = -1;
1265 gid_t group_list[NGROUPS_MAX];
1266
1267 /* Possible options for -R and -S */
1268
1269 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1270
1271 /* Need to define this in case we need to change the environment in order
1272 to get rid of a bogus time zone. We have to make it char rather than uschar
1273 because some OS define it in /usr/include/unistd.h. */
1274
1275 extern char **environ;
1276
1277 /* If the Exim user and/or group and/or the configuration file owner/group were
1278 defined by ref:name at build time, we must now find the actual uid/gid values.
1279 This is a feature to make the lives of binary distributors easier. */
1280
1281 #ifdef EXIM_USERNAME
1282 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1283 {
1284 exim_gid = pw->pw_gid;
1285 }
1286 else
1287 {
1288 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1289 EXIM_USERNAME);
1290 exit(EXIT_FAILURE);
1291 }
1292 #endif
1293
1294 #ifdef EXIM_GROUPNAME
1295 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1296 {
1297 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1298 EXIM_GROUPNAME);
1299 exit(EXIT_FAILURE);
1300 }
1301 #endif
1302
1303 #ifdef CONFIGURE_OWNERNAME
1304 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1305 {
1306 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1307 CONFIGURE_OWNERNAME);
1308 exit(EXIT_FAILURE);
1309 }
1310 #endif
1311
1312 #ifdef CONFIGURE_GROUPNAME
1313 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1314 {
1315 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1316 CONFIGURE_GROUPNAME);
1317 exit(EXIT_FAILURE);
1318 }
1319 #endif
1320
1321 /* In the Cygwin environment, some initialization needs doing. It is fudged
1322 in by means of this macro. */
1323
1324 #ifdef OS_INIT
1325 OS_INIT
1326 #endif
1327
1328 /* Check a field which is patched when we are running Exim within its
1329 testing harness; do a fast initial check, and then the whole thing. */
1330
1331 running_in_test_harness =
1332 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1333
1334 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1335 at the start of a program; however, it seems that some environments do not
1336 follow this. A "strange" locale can affect the formatting of timestamps, so we
1337 make quite sure. */
1338
1339 setlocale(LC_ALL, "C");
1340
1341 /* Set up the default handler for timing using alarm(). */
1342
1343 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1344
1345 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1346 because store_malloc writes a log entry on failure. */
1347
1348 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1349 if (log_buffer == NULL)
1350 {
1351 fprintf(stderr, "exim: failed to get store for log buffer\n");
1352 exit(EXIT_FAILURE);
1353 }
1354
1355 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1356 NULL when the daemon is run and the file is closed. We have to use this
1357 indirection, because some systems don't allow writing to the variable "stderr".
1358 */
1359
1360 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1361
1362 /* Arrange for the PCRE regex library to use our store functions. Note that
1363 the normal calls are actually macros that add additional arguments for
1364 debugging purposes so we have to assign specially constructed functions here.
1365 The default is to use store in the stacking pool, but this is overridden in the
1366 regex_must_compile() function. */
1367
1368 pcre_malloc = function_store_get;
1369 pcre_free = function_dummy_free;
1370
1371 /* Ensure there is a big buffer for temporary use in several places. It is put
1372 in malloc store so that it can be freed for enlargement if necessary. */
1373
1374 big_buffer = store_malloc(big_buffer_size);
1375
1376 /* Set up the handler for the data request signal, and set the initial
1377 descriptive text. */
1378
1379 set_process_info("initializing");
1380 os_restarting_signal(SIGUSR1, usr1_handler);
1381
1382 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1383 in the daemon code. For the rest of Exim's uses, we ignore it. */
1384
1385 signal(SIGHUP, SIG_IGN);
1386
1387 /* We don't want to die on pipe errors as the code is written to handle
1388 the write error instead. */
1389
1390 signal(SIGPIPE, SIG_IGN);
1391
1392 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1393 set to SIG_IGN. This causes subprocesses that complete before the parent
1394 process waits for them not to hang around, so when Exim calls wait(), nothing
1395 is there. The wait() code has been made robust against this, but let's ensure
1396 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1397 ending status. We use sigaction rather than plain signal() on those OS where
1398 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1399 problem on AIX with this.) */
1400
1401 #ifdef SA_NOCLDWAIT
1402 {
1403 struct sigaction act;
1404 act.sa_handler = SIG_DFL;
1405 sigemptyset(&(act.sa_mask));
1406 act.sa_flags = 0;
1407 sigaction(SIGCHLD, &act, NULL);
1408 }
1409 #else
1410 signal(SIGCHLD, SIG_DFL);
1411 #endif
1412
1413 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1414 SIGHUP. */
1415
1416 sighup_argv = argv;
1417
1418 /* Set up the version number. Set up the leading 'E' for the external form of
1419 message ids, set the pointer to the internal form, and initialize it to
1420 indicate no message being processed. */
1421
1422 version_init();
1423 message_id_option[0] = '-';
1424 message_id_external = message_id_option + 1;
1425 message_id_external[0] = 'E';
1426 message_id = message_id_external + 1;
1427 message_id[0] = 0;
1428
1429 /* Set the umask to zero so that any files that Exim creates are created
1430 with the modes that it specifies. */
1431
1432 umask(0);
1433
1434 /* Precompile the regular expression for matching a message id. Keep this in
1435 step with the code that generates ids in the accept.c module. We need to do
1436 this here, because the -M options check their arguments for syntactic validity
1437 using mac_ismsgid, which uses this. */
1438
1439 regex_ismsgid =
1440 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1441
1442 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1443 this seems to be a generally accepted convention, since one finds symbolic
1444 links called "mailq" in standard OS configurations. */
1445
1446 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1447 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1448 {
1449 list_queue = TRUE;
1450 receiving_message = FALSE;
1451 called_as = US"-mailq";
1452 }
1453
1454 /* If the program is called as "rmail" treat it as equivalent to
1455 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1456 i.e. preventing a single dot on a line from terminating the message, and
1457 returning with zero return code, even in cases of error (provided an error
1458 message has been sent). */
1459
1460 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1461 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1462 {
1463 dot_ends = FALSE;
1464 called_as = US"-rmail";
1465 errors_sender_rc = EXIT_SUCCESS;
1466 }
1467
1468 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1469 this is a smail convention. */
1470
1471 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1472 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1473 {
1474 smtp_input = smtp_batched_input = TRUE;
1475 called_as = US"-rsmtp";
1476 }
1477
1478 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1479 this is a smail convention. */
1480
1481 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1482 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1483 {
1484 queue_interval = 0;
1485 receiving_message = FALSE;
1486 called_as = US"-runq";
1487 }
1488
1489 /* If the program is called as "newaliases" treat it as equivalent to
1490 "exim -bi"; this is a sendmail convention. */
1491
1492 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1493 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1494 {
1495 bi_option = TRUE;
1496 receiving_message = FALSE;
1497 called_as = US"-newaliases";
1498 }
1499
1500 /* Save the original effective uid for a couple of uses later. It should
1501 normally be root, but in some esoteric environments it may not be. */
1502
1503 original_euid = geteuid();
1504
1505 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1506 to be the same as the real ones. This makes a difference only if Exim is setuid
1507 (or setgid) to something other than root, which could be the case in some
1508 special configurations. */
1509
1510 real_uid = getuid();
1511 real_gid = getgid();
1512
1513 if (real_uid == root_uid)
1514 {
1515 setgid(real_gid);
1516 setuid(real_uid);
1517 }
1518
1519 /* If neither the original real uid nor the original euid was root, Exim is
1520 running in an unprivileged state. */
1521
1522 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1523
1524 /* If the first argument is --help, pretend there are no arguments. This will
1525 cause a brief message to be given. */
1526
1527 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0) argc = 1;
1528
1529 /* Scan the program's arguments. Some can be dealt with right away; others are
1530 simply recorded for checking and handling afterwards. Do a high-level switch
1531 on the second character (the one after '-'), to save some effort. */
1532
1533 for (i = 1; i < argc; i++)
1534 {
1535 BOOL badarg = FALSE;
1536 uschar *arg = argv[i];
1537 uschar *argrest;
1538 int switchchar;
1539
1540 /* An argument not starting with '-' is the start of a recipients list;
1541 break out of the options-scanning loop. */
1542
1543 if (arg[0] != '-')
1544 {
1545 recipients_arg = i;
1546 break;
1547 }
1548
1549 /* An option consistion of -- terminates the options */
1550
1551 if (Ustrcmp(arg, "--") == 0)
1552 {
1553 recipients_arg = i + 1;
1554 break;
1555 }
1556
1557 /* Handle flagged options */
1558
1559 switchchar = arg[1];
1560 argrest = arg+2;
1561
1562 /* Make all -ex options synonymous with -oex arguments, since that
1563 is assumed by various callers. Also make -qR options synonymous with -R
1564 options, as that seems to be required as well. Allow for -qqR too, and
1565 the same for -S options. */
1566
1567 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1568 Ustrncmp(arg+1, "qR", 2) == 0 ||
1569 Ustrncmp(arg+1, "qS", 2) == 0)
1570 {
1571 switchchar = arg[2];
1572 argrest++;
1573 }
1574 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1575 {
1576 switchchar = arg[3];
1577 argrest += 2;
1578 queue_2stage = TRUE;
1579 }
1580
1581 /* Make -r synonymous with -f, since it is a documented alias */
1582
1583 else if (arg[1] == 'r') switchchar = 'f';
1584
1585 /* Make -ov synonymous with -v */
1586
1587 else if (Ustrcmp(arg, "-ov") == 0)
1588 {
1589 switchchar = 'v';
1590 argrest++;
1591 }
1592
1593 /* High-level switch on active initial letter */
1594
1595 switch(switchchar)
1596 {
1597 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1598 so has no need of it. */
1599
1600 case 'B':
1601 if (*argrest == 0) i++; /* Skip over the type */
1602 break;
1603
1604
1605 case 'b':
1606 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1607
1608 /* -bd: Run in daemon mode, awaiting SMTP connections.
1609 -bdf: Ditto, but in the foreground.
1610 */
1611
1612 if (*argrest == 'd')
1613 {
1614 daemon_listen = TRUE;
1615 if (*(++argrest) == 'f') background_daemon = FALSE;
1616 else if (*argrest != 0) { badarg = TRUE; break; }
1617 }
1618
1619 /* -be: Run in expansion test mode */
1620
1621 else if (*argrest == 'e')
1622 expansion_test = checking = TRUE;
1623
1624 /* -bF: Run system filter test */
1625
1626 else if (*argrest == 'F')
1627 {
1628 filter_test |= FTEST_SYSTEM;
1629 if (*(++argrest) != 0) { badarg = TRUE; break; }
1630 if (++i < argc) filter_test_sfile = argv[i]; else
1631 {
1632 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1633 exit(EXIT_FAILURE);
1634 }
1635 }
1636
1637 /* -bf: Run user filter test
1638 -bfd: Set domain for filter testing
1639 -bfl: Set local part for filter testing
1640 -bfp: Set prefix for filter testing
1641 -bfs: Set suffix for filter testing
1642 */
1643
1644 else if (*argrest == 'f')
1645 {
1646 if (*(++argrest) == 0)
1647 {
1648 filter_test |= FTEST_USER;
1649 if (++i < argc) filter_test_ufile = argv[i]; else
1650 {
1651 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1652 exit(EXIT_FAILURE);
1653 }
1654 }
1655 else
1656 {
1657 if (++i >= argc)
1658 {
1659 fprintf(stderr, "exim: string expected after %s\n", arg);
1660 exit(EXIT_FAILURE);
1661 }
1662 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1663 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1664 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1665 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1666 else { badarg = TRUE; break; }
1667 }
1668 }
1669
1670 /* -bh: Host checking - an IP address must follow. */
1671
1672 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1673 {
1674 if (++i >= argc) { badarg = TRUE; break; }
1675 sender_host_address = argv[i];
1676 host_checking = checking = log_testing_mode = TRUE;
1677 host_checking_callout = argrest[1] == 'c';
1678 }
1679
1680 /* -bi: This option is used by sendmail to initialize *the* alias file,
1681 though it has the -oA option to specify a different file. Exim has no
1682 concept of *the* alias file, but since Sun's YP make script calls
1683 sendmail this way, some support must be provided. */
1684
1685 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1686
1687 /* -bm: Accept and deliver message - the default option. Reinstate
1688 receiving_message, which got turned off for all -b options. */
1689
1690 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1691
1692 /* -bnq: For locally originating messages, do not qualify unqualified
1693 addresses. In the envelope, this causes errors; in header lines they
1694 just get left. */
1695
1696 else if (Ustrcmp(argrest, "nq") == 0)
1697 {
1698 allow_unqualified_sender = FALSE;
1699 allow_unqualified_recipient = FALSE;
1700 }
1701
1702 /* -bpxx: List the contents of the mail queue, in various forms. If
1703 the option is -bpc, just a queue count is needed. Otherwise, if the
1704 first letter after p is r, then order is random. */
1705
1706 else if (*argrest == 'p')
1707 {
1708 if (*(++argrest) == 'c')
1709 {
1710 count_queue = TRUE;
1711 if (*(++argrest) != 0) badarg = TRUE;
1712 break;
1713 }
1714
1715 if (*argrest == 'r')
1716 {
1717 list_queue_option = 8;
1718 argrest++;
1719 }
1720 else list_queue_option = 0;
1721
1722 list_queue = TRUE;
1723
1724 /* -bp: List the contents of the mail queue, top-level only */
1725
1726 if (*argrest == 0) {}
1727
1728 /* -bpu: List the contents of the mail queue, top-level undelivered */
1729
1730 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1731
1732 /* -bpa: List the contents of the mail queue, including all delivered */
1733
1734 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1735
1736 /* Unknown after -bp[r] */
1737
1738 else
1739 {
1740 badarg = TRUE;
1741 break;
1742 }
1743 }
1744
1745
1746 /* -bP: List the configuration variables given as the address list.
1747 Force -v, so configuration errors get displayed. */
1748
1749 else if (Ustrcmp(argrest, "P") == 0)
1750 {
1751 list_options = TRUE;
1752 debug_selector |= D_v;
1753 debug_file = stderr;
1754 }
1755
1756 /* -brt: Test retry configuration lookup */
1757
1758 else if (Ustrcmp(argrest, "rt") == 0)
1759 {
1760 test_retry_arg = i + 1;
1761 goto END_ARG;
1762 }
1763
1764 /* -brw: Test rewrite configuration */
1765
1766 else if (Ustrcmp(argrest, "rw") == 0)
1767 {
1768 test_rewrite_arg = i + 1;
1769 goto END_ARG;
1770 }
1771
1772 /* -bS: Read SMTP commands on standard input, but produce no replies -
1773 all errors are reported by sending messages. */
1774
1775 else if (Ustrcmp(argrest, "S") == 0)
1776 smtp_input = smtp_batched_input = receiving_message = TRUE;
1777
1778 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1779 on standard output. */
1780
1781 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1782
1783 /* -bt: address testing mode */
1784
1785 else if (Ustrcmp(argrest, "t") == 0)
1786 address_test_mode = checking = log_testing_mode = TRUE;
1787
1788 /* -bv: verify addresses */
1789
1790 else if (Ustrcmp(argrest, "v") == 0)
1791 verify_address_mode = checking = log_testing_mode = TRUE;
1792
1793 /* -bvs: verify sender addresses */
1794
1795 else if (Ustrcmp(argrest, "vs") == 0)
1796 {
1797 verify_address_mode = checking = log_testing_mode = TRUE;
1798 verify_as_sender = TRUE;
1799 }
1800
1801 /* -bV: Print version string and support details */
1802
1803 else if (Ustrcmp(argrest, "V") == 0)
1804 {
1805 printf("Exim version %s #%s built %s\n", version_string,
1806 version_cnumber, version_date);
1807 printf("%s\n", CS version_copyright);
1808 version_printed = TRUE;
1809 show_whats_supported(stdout);
1810 }
1811
1812 else badarg = TRUE;
1813 break;
1814
1815
1816 /* -C: change configuration file list; ignore if it isn't really
1817 a change! Enforce a prefix check if required. */
1818
1819 case 'C':
1820 if (*argrest == 0)
1821 {
1822 if(++i < argc) argrest = argv[i]; else
1823 { badarg = TRUE; break; }
1824 }
1825 if (Ustrcmp(config_main_filelist, argrest) != 0)
1826 {
1827 #ifdef ALT_CONFIG_PREFIX
1828 int sep = 0;
1829 int len = Ustrlen(ALT_CONFIG_PREFIX);
1830 uschar *list = argrest;
1831 uschar *filename;
1832 while((filename = string_nextinlist(&list, &sep, big_buffer,
1833 big_buffer_size)) != NULL)
1834 {
1835 if ((Ustrlen(filename) < len ||
1836 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1837 Ustrstr(filename, "/../") != NULL) &&
1838 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1839 {
1840 fprintf(stderr, "-C Permission denied\n");
1841 exit(EXIT_FAILURE);
1842 }
1843 }
1844 #endif
1845
1846 config_main_filelist = argrest;
1847 config_changed = TRUE;
1848 }
1849 break;
1850
1851
1852 /* -D: set up a macro definition */
1853
1854 case 'D':
1855 #ifdef DISABLE_D_OPTION
1856 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1857 exit(EXIT_FAILURE);
1858 #else
1859 {
1860 int ptr = 0;
1861 macro_item *mlast = NULL;
1862 macro_item *m;
1863 uschar name[24];
1864 uschar *s = argrest;
1865
1866 while (isspace(*s)) s++;
1867
1868 if (*s < 'A' || *s > 'Z')
1869 {
1870 fprintf(stderr, "exim: macro name set by -D must start with "
1871 "an upper case letter\n");
1872 exit(EXIT_FAILURE);
1873 }
1874
1875 while (isalnum(*s) || *s == '_')
1876 {
1877 if (ptr < sizeof(name)-1) name[ptr++] = *s;
1878 s++;
1879 }
1880 name[ptr] = 0;
1881 if (ptr == 0) { badarg = TRUE; break; }
1882 while (isspace(*s)) s++;
1883 if (*s != 0)
1884 {
1885 if (*s++ != '=') { badarg = TRUE; break; }
1886 while (isspace(*s)) s++;
1887 }
1888
1889 for (m = macros; m != NULL; m = m->next)
1890 {
1891 if (Ustrcmp(m->name, name) == 0)
1892 {
1893 fprintf(stderr, "exim: duplicated -D in command line\n");
1894 exit(EXIT_FAILURE);
1895 }
1896 mlast = m;
1897 }
1898
1899 m = store_get(sizeof(macro_item) + Ustrlen(name));
1900 m->next = NULL;
1901 m->command_line = TRUE;
1902 if (mlast == NULL) macros = m; else mlast->next = m;
1903 Ustrcpy(m->name, name);
1904 m->replacement = string_copy(s);
1905
1906 if (clmacro_count >= MAX_CLMACROS)
1907 {
1908 fprintf(stderr, "exim: too many -D options on command line\n");
1909 exit(EXIT_FAILURE);
1910 }
1911 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
1912 m->replacement);
1913 }
1914 #endif
1915 break;
1916
1917 /* -d: Set debug level (see also -v below) or set the drop_cr option.
1918 The latter is now a no-op, retained for compatibility only. If -dd is used,
1919 debugging subprocesses of the daemon is disabled. */
1920
1921 case 'd':
1922 if (Ustrcmp(argrest, "ropcr") == 0)
1923 {
1924 /* drop_cr = TRUE; */
1925 }
1926
1927 /* Use an intermediate variable so that we don't set debugging while
1928 decoding the debugging bits. */
1929
1930 else
1931 {
1932 unsigned int selector = D_default;
1933 debug_selector = 0;
1934 debug_file = NULL;
1935 if (*argrest == 'd')
1936 {
1937 debug_daemon = TRUE;
1938 argrest++;
1939 }
1940 if (*argrest != 0)
1941 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
1942 debug_options_count, US"debug");
1943 debug_selector = selector;
1944 }
1945 break;
1946
1947
1948 /* -E: This is a local error message. This option is not intended for
1949 external use at all, but is not restricted to trusted callers because it
1950 does no harm (just suppresses certain error messages) and if Exim is run
1951 not setuid root it won't always be trusted when it generates error
1952 messages using this option. If there is a message id following -E, point
1953 message_reference at it, for logging. */
1954
1955 case 'E':
1956 local_error_message = TRUE;
1957 if (mac_ismsgid(argrest)) message_reference = argrest;
1958 break;
1959
1960
1961 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
1962 option, so it looks as if historically the -oex options are also callable
1963 without the leading -o. So we have to accept them. Before the switch,
1964 anything starting -oe has been converted to -e. Exim does not support all
1965 of the sendmail error options. */
1966
1967 case 'e':
1968 if (Ustrcmp(argrest, "e") == 0)
1969 {
1970 arg_error_handling = ERRORS_SENDER;
1971 errors_sender_rc = EXIT_SUCCESS;
1972 }
1973 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
1974 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
1975 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
1976 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
1977 else badarg = TRUE;
1978 break;
1979
1980
1981 /* -F: Set sender's full name, used instead of the gecos entry from
1982 the password file. Since users can usually alter their gecos entries,
1983 there's no security involved in using this instead. The data can follow
1984 the -F or be in the next argument. */
1985
1986 case 'F':
1987 if (*argrest == 0)
1988 {
1989 if(++i < argc) argrest = argv[i]; else
1990 { badarg = TRUE; break; }
1991 }
1992 originator_name = argrest;
1993 break;
1994
1995
1996 /* -f: Set sender's address - this value is only actually used if Exim is
1997 run by a trusted user, or if untrusted_set_sender is set and matches the
1998 address, except that the null address can always be set by any user. The
1999 test for this happens later, when the value given here is ignored when not
2000 permitted. For an untrusted user, the actual sender is still put in Sender:
2001 if it doesn't match the From: header (unless no_local_from_check is set).
2002 The data can follow the -f or be in the next argument. The -r switch is an
2003 obsolete form of -f but since there appear to be programs out there that
2004 use anything that sendmail has ever supported, better accept it - the
2005 synonymizing is done before the switch above.
2006
2007 At this stage, we must allow domain literal addresses, because we don't
2008 know what the setting of allow_domain_literals is yet. Ditto for trailing
2009 dots and strip_trailing_dot. */
2010
2011 case 'f':
2012 {
2013 int start, end;
2014 uschar *errmess;
2015 if (*argrest == 0)
2016 {
2017 if (i+1 < argc) argrest = argv[++i]; else
2018 { badarg = TRUE; break; }
2019 }
2020 if (*argrest == 0)
2021 {
2022 sender_address = string_sprintf(""); /* Ensure writeable memory */
2023 }
2024 else
2025 {
2026 uschar *temp = argrest + Ustrlen(argrest) - 1;
2027 while (temp >= argrest && isspace(*temp)) temp--;
2028 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2029 allow_domain_literals = TRUE;
2030 strip_trailing_dot = TRUE;
2031 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2032 &sender_address_domain, TRUE);
2033 allow_domain_literals = FALSE;
2034 strip_trailing_dot = FALSE;
2035 if (sender_address == NULL)
2036 {
2037 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2038 return EXIT_FAILURE;
2039 }
2040 }
2041 sender_address_forced = TRUE;
2042 }
2043 break;
2044
2045 /* This is some Sendmail thing which can be ignored */
2046
2047 case 'G':
2048 break;
2049
2050 /* -h: Set the hop count for an incoming message. Exim does not currently
2051 support this; it always computes it by counting the Received: headers.
2052 To put it in will require a change to the spool header file format. */
2053
2054 case 'h':
2055 if (*argrest == 0)
2056 {
2057 if(++i < argc) argrest = argv[i]; else
2058 { badarg = TRUE; break; }
2059 }
2060 if (!isdigit(*argrest)) badarg = TRUE;
2061 break;
2062
2063
2064 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2065 not to be documented for sendmail but mailx (at least) uses it) */
2066
2067 case 'i':
2068 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2069 break;
2070
2071
2072 case 'M':
2073 receiving_message = FALSE;
2074
2075 /* -MC: continue delivery of another message via an existing open
2076 file descriptor. This option is used for an internal call by the
2077 smtp transport when there is a pending message waiting to go to an
2078 address to which it has got a connection. Five subsequent arguments are
2079 required: transport name, host name, IP address, sequence number, and
2080 message_id. Transports may decline to create new processes if the sequence
2081 number gets too big. The channel is stdin. This (-MC) must be the last
2082 argument. There's a subsequent check that the real-uid is privileged.
2083
2084 If we are running in the test harness. delay for a bit, to let the process
2085 that set this one up complete. This makes for repeatability of the logging,
2086 etc. output. */
2087
2088 if (Ustrcmp(argrest, "C") == 0)
2089 {
2090 if (argc != i + 6)
2091 {
2092 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2093 return EXIT_FAILURE;
2094 }
2095
2096 if (msg_action_arg >= 0)
2097 {
2098 fprintf(stderr, "exim: incompatible arguments\n");
2099 return EXIT_FAILURE;
2100 }
2101
2102 continue_transport = argv[++i];
2103 continue_hostname = argv[++i];
2104 continue_host_address = argv[++i];
2105 continue_sequence = Uatoi(argv[++i]);
2106 msg_action = MSG_DELIVER;
2107 msg_action_arg = ++i;
2108 forced_delivery = TRUE;
2109 queue_run_pid = passed_qr_pid;
2110 queue_run_pipe = passed_qr_pipe;
2111
2112 if (!mac_ismsgid(argv[i]))
2113 {
2114 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2115 argv[i]);
2116 return EXIT_FAILURE;
2117 }
2118
2119 if (running_in_test_harness) millisleep(500);
2120 break;
2121 }
2122
2123 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2124 precedes -MC (see above). The flag indicates that the host to which
2125 Exim is connected has accepted an AUTH sequence. */
2126
2127 else if (Ustrcmp(argrest, "CA") == 0)
2128 {
2129 smtp_authenticated = TRUE;
2130 break;
2131 }
2132
2133 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2134 it preceded -MC (see above) */
2135
2136 else if (Ustrcmp(argrest, "CP") == 0)
2137 {
2138 smtp_use_pipelining = TRUE;
2139 break;
2140 }
2141
2142 /* -MCQ: pass on the pid of the queue-running process that started
2143 this chain of deliveries and the fd of its synchronizing pipe; this
2144 is useful only when it precedes -MC (see above) */
2145
2146 else if (Ustrcmp(argrest, "CQ") == 0)
2147 {
2148 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2149 else badarg = TRUE;
2150 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2151 else badarg = TRUE;
2152 break;
2153 }
2154
2155 /* -MCS: set the smtp_use_size flag; this is useful only when it
2156 precedes -MC (see above) */
2157
2158 else if (Ustrcmp(argrest, "CS") == 0)
2159 {
2160 smtp_use_size = TRUE;
2161 break;
2162 }
2163
2164 /* -MCT: set the tls_offered flag; this is useful only when it
2165 precedes -MC (see above). The flag indicates that the host to which
2166 Exim is connected has offered TLS support. */
2167
2168 #ifdef SUPPORT_TLS
2169 else if (Ustrcmp(argrest, "CT") == 0)
2170 {
2171 tls_offered = TRUE;
2172 break;
2173 }
2174 #endif
2175
2176 /* -M[x]: various operations on the following list of message ids:
2177 -M deliver the messages, ignoring next retry times and thawing
2178 -Mc deliver the messages, checking next retry times, no thawing
2179 -Mf freeze the messages
2180 -Mg give up on the messages
2181 -Mt thaw the messages
2182 -Mrm remove the messages
2183 In the above cases, this must be the last option. There are also the
2184 following options which are followed by a single message id, and which
2185 act on that message. Some of them use the "recipient" addresses as well.
2186 -Mar add recipient(s)
2187 -Mmad mark all recipients delivered
2188 -Mmd mark recipients(s) delivered
2189 -Mes edit sender
2190 -Mvb show body
2191 -Mvh show header
2192 -Mvl show log
2193 */
2194
2195 else if (*argrest == 0)
2196 {
2197 msg_action = MSG_DELIVER;
2198 forced_delivery = deliver_force_thaw = TRUE;
2199 }
2200 else if (Ustrcmp(argrest, "ar") == 0)
2201 {
2202 msg_action = MSG_ADD_RECIPIENT;
2203 one_msg_action = TRUE;
2204 }
2205 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2206 else if (Ustrcmp(argrest, "es") == 0)
2207 {
2208 msg_action = MSG_EDIT_SENDER;
2209 one_msg_action = TRUE;
2210 }
2211 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2212 else if (Ustrcmp(argrest, "g") == 0)
2213 {
2214 msg_action = MSG_DELIVER;
2215 deliver_give_up = TRUE;
2216 }
2217 else if (Ustrcmp(argrest, "mad") == 0)
2218 {
2219 msg_action = MSG_MARK_ALL_DELIVERED;
2220 }
2221 else if (Ustrcmp(argrest, "md") == 0)
2222 {
2223 msg_action = MSG_MARK_DELIVERED;
2224 one_msg_action = TRUE;
2225 }
2226 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2227 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2228 else if (Ustrcmp(argrest, "vb") == 0)
2229 {
2230 msg_action = MSG_SHOW_BODY;
2231 one_msg_action = TRUE;
2232 }
2233 else if (Ustrcmp(argrest, "vh") == 0)
2234 {
2235 msg_action = MSG_SHOW_HEADER;
2236 one_msg_action = TRUE;
2237 }
2238 else if (Ustrcmp(argrest, "vl") == 0)
2239 {
2240 msg_action = MSG_SHOW_LOG;
2241 one_msg_action = TRUE;
2242 }
2243 else { badarg = TRUE; break; }
2244
2245 /* All the -Mxx options require at least one message id. */
2246
2247 msg_action_arg = i + 1;
2248 if (msg_action_arg >= argc)
2249 {
2250 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2251 return EXIT_FAILURE;
2252 }
2253
2254 /* Some require only message ids to follow */
2255
2256 if (!one_msg_action)
2257 {
2258 int j;
2259 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2260 {
2261 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2262 argv[j], arg);
2263 return EXIT_FAILURE;
2264 }
2265 goto END_ARG; /* Remaining args are ids */
2266 }
2267
2268 /* Others require only one message id, possibly followed by addresses,
2269 which will be handled as normal arguments. */
2270
2271 else
2272 {
2273 if (!mac_ismsgid(argv[msg_action_arg]))
2274 {
2275 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2276 argv[msg_action_arg], arg);
2277 return EXIT_FAILURE;
2278 }
2279 i++;
2280 }
2281 break;
2282
2283
2284 /* Some programs seem to call the -om option without the leading o;
2285 for sendmail it askes for "me too". Exim always does this. */
2286
2287 case 'm':
2288 if (*argrest != 0) badarg = TRUE;
2289 break;
2290
2291
2292 /* -N: don't do delivery - a debugging option that stops transports doing
2293 their thing. It implies debugging at the D_v level. */
2294
2295 case 'N':
2296 if (*argrest == 0)
2297 {
2298 dont_deliver = TRUE;
2299 debug_selector |= D_v;
2300 debug_file = stderr;
2301 }
2302 else badarg = TRUE;
2303 break;
2304
2305
2306 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2307 it. */
2308
2309 case 'n':
2310 break;
2311
2312 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2313 option to the specified value. This form uses long names. We need to handle
2314 -O option=value and -Ooption=value. */
2315
2316 case 'O':
2317 if (*argrest == 0)
2318 {
2319 if (++i >= argc)
2320 {
2321 fprintf(stderr, "exim: string expected after -O\n");
2322 exit(EXIT_FAILURE);
2323 }
2324 }
2325 break;
2326
2327 case 'o':
2328
2329 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2330 file" option). */
2331
2332 if (*argrest == 'A')
2333 {
2334 alias_arg = argrest + 1;
2335 if (alias_arg[0] == 0)
2336 {
2337 if (i+1 < argc) alias_arg = argv[++i]; else
2338 {
2339 fprintf(stderr, "exim: string expected after -oA\n");
2340 exit(EXIT_FAILURE);
2341 }
2342 }
2343 }
2344
2345 /* -oB: Set a connection message max value for remote deliveries */
2346
2347 else if (*argrest == 'B')
2348 {
2349 uschar *p = argrest + 1;
2350 if (p[0] == 0)
2351 {
2352 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2353 {
2354 connection_max_messages = 1;
2355 p = NULL;
2356 }
2357 }
2358
2359 if (p != NULL)
2360 {
2361 if (!isdigit(*p))
2362 {
2363 fprintf(stderr, "exim: number expected after -oB\n");
2364 exit(EXIT_FAILURE);
2365 }
2366 connection_max_messages = Uatoi(p);
2367 }
2368 }
2369
2370 /* -odb: background delivery */
2371
2372 else if (Ustrcmp(argrest, "db") == 0)
2373 {
2374 synchronous_delivery = FALSE;
2375 arg_queue_only = FALSE;
2376 queue_only_set = TRUE;
2377 }
2378
2379 /* -odf: foreground delivery (smail-compatible option); same effect as
2380 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2381 */
2382
2383 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2384 {
2385 synchronous_delivery = TRUE;
2386 arg_queue_only = FALSE;
2387 queue_only_set = TRUE;
2388 }
2389
2390 /* -odq: queue only */
2391
2392 else if (Ustrcmp(argrest, "dq") == 0)
2393 {
2394 synchronous_delivery = FALSE;
2395 arg_queue_only = TRUE;
2396 queue_only_set = TRUE;
2397 }
2398
2399 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2400 but no remote delivery */
2401
2402 else if (Ustrcmp(argrest, "dqs") == 0)
2403 {
2404 queue_smtp = TRUE;
2405 arg_queue_only = FALSE;
2406 queue_only_set = TRUE;
2407 }
2408
2409 /* -oex: Sendmail error flags. As these are also accepted without the
2410 leading -o prefix, for compatibility with vacation and other callers,
2411 they are handled with -e above. */
2412
2413 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2414 -oitrue: Another sendmail syntax for the same */
2415
2416 else if (Ustrcmp(argrest, "i") == 0 ||
2417 Ustrcmp(argrest, "itrue") == 0)
2418 dot_ends = FALSE;
2419
2420 /* -oM*: Set various characteristics for an incoming message; actually
2421 acted on for trusted callers only. */
2422
2423 else if (*argrest == 'M')
2424 {
2425 if (i+1 >= argc)
2426 {
2427 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2428 exit(EXIT_FAILURE);
2429 }
2430
2431 /* -oMa: Set sender host address */
2432
2433 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2434
2435 /* -oMaa: Set authenticator name */
2436
2437 else if (Ustrcmp(argrest, "Maa") == 0)
2438 sender_host_authenticated = argv[++i];
2439
2440 /* -oMas: setting authenticated sender */
2441
2442 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2443
2444 /* -oMai: setting authenticated id */
2445
2446 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2447
2448 /* -oMi: Set incoming interface address */
2449
2450 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2451
2452 /* -oMr: Received protocol */
2453
2454 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2455
2456 /* -oMs: Set sender host name */
2457
2458 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2459
2460 /* -oMt: Set sender ident */
2461
2462 else if (Ustrcmp(argrest, "Mt") == 0) sender_ident = argv[++i];
2463
2464 /* Else a bad argument */
2465
2466 else
2467 {
2468 badarg = TRUE;
2469 break;
2470 }
2471 }
2472
2473 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2474 seem to call this as -m (undocumented), so that is also accepted (see
2475 above). */
2476
2477 else if (Ustrcmp(argrest, "m") == 0) {}
2478
2479 /* -oo: An ancient flag for old-style addresses which still seems to
2480 crop up in some calls (see in SCO). */
2481
2482 else if (Ustrcmp(argrest, "o") == 0) {}
2483
2484 /* -oP <name>: set pid file path for daemon */
2485
2486 else if (Ustrcmp(argrest, "P") == 0)
2487 override_pid_file_path = argv[++i];
2488
2489 /* -or <n>: set timeout for non-SMTP acceptance
2490 -os <n>: set timeout for SMTP acceptance */
2491
2492 else if (*argrest == 'r' || *argrest == 's')
2493 {
2494 int *tp = (*argrest == 'r')?
2495 &arg_receive_timeout : &arg_smtp_receive_timeout;
2496 if (argrest[1] == 0)
2497 {
2498 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2499 }
2500 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2501 if (*tp < 0)
2502 {
2503 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2504 exit(EXIT_FAILURE);
2505 }
2506 }
2507
2508 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2509
2510 else if (Ustrcmp(argrest, "X") == 0)
2511 override_local_interfaces = argv[++i];
2512
2513 /* Unknown -o argument */
2514
2515 else badarg = TRUE;
2516 break;
2517
2518
2519 /* -ps: force Perl startup; -pd force delayed Perl startup */
2520
2521 case 'p':
2522 #ifdef EXIM_PERL
2523 if (*argrest == 's' && argrest[1] == 0)
2524 {
2525 perl_start_option = 1;
2526 break;
2527 }
2528 if (*argrest == 'd' && argrest[1] == 0)
2529 {
2530 perl_start_option = -1;
2531 break;
2532 }
2533 #endif
2534
2535 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2536 which sets the host protocol and host name */
2537
2538 if (*argrest == 0)
2539 {
2540 if (i+1 < argc) argrest = argv[++i]; else
2541 { badarg = TRUE; break; }
2542 }
2543
2544 if (*argrest != 0)
2545 {
2546 uschar *hn = Ustrchr(argrest, ':');
2547 if (hn == NULL)
2548 {
2549 received_protocol = argrest;
2550 }
2551 else
2552 {
2553 received_protocol = string_copyn(argrest, hn - argrest);
2554 sender_host_name = hn + 1;
2555 }
2556 }
2557 break;
2558
2559
2560 case 'q':
2561 receiving_message = FALSE;
2562
2563 /* -qq...: Do queue runs in a 2-stage manner */
2564
2565 if (*argrest == 'q')
2566 {
2567 queue_2stage = TRUE;
2568 argrest++;
2569 }
2570
2571 /* -qi...: Do only first (initial) deliveries */
2572
2573 if (*argrest == 'i')
2574 {
2575 queue_run_first_delivery = TRUE;
2576 argrest++;
2577 }
2578
2579 /* -qf...: Run the queue, forcing deliveries
2580 -qff..: Ditto, forcing thawing as well */
2581
2582 if (*argrest == 'f')
2583 {
2584 queue_run_force = TRUE;
2585 if (*(++argrest) == 'f')
2586 {
2587 deliver_force_thaw = TRUE;
2588 argrest++;
2589 }
2590 }
2591
2592 /* -q[f][f]l...: Run the queue only on local deliveries */
2593
2594 if (*argrest == 'l')
2595 {
2596 queue_run_local = TRUE;
2597 argrest++;
2598 }
2599
2600 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2601 optionally starting from a given message id. */
2602
2603 if (*argrest == 0 &&
2604 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2605 {
2606 queue_interval = 0;
2607 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2608 start_queue_run_id = argv[++i];
2609 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2610 stop_queue_run_id = argv[++i];
2611 }
2612
2613 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2614 optionally local only. */
2615
2616 else
2617 {
2618 if (*argrest != 0)
2619 queue_interval = readconf_readtime(argrest, 0, FALSE);
2620 else
2621 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2622 if (queue_interval <= 0)
2623 {
2624 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2625 exit(EXIT_FAILURE);
2626 }
2627 }
2628 break;
2629
2630
2631 case 'R': /* Synonymous with -qR... */
2632 receiving_message = FALSE;
2633
2634 /* -Rf: As -R (below) but force all deliveries,
2635 -Rff: Ditto, but also thaw all frozen messages,
2636 -Rr: String is regex
2637 -Rrf: Regex and force
2638 -Rrff: Regex and force and thaw
2639
2640 in all cases provided there are no further characters in this
2641 argument. */
2642
2643 if (*argrest != 0)
2644 {
2645 int i;
2646 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2647 {
2648 if (Ustrcmp(argrest, rsopts[i]) == 0)
2649 {
2650 if (i != 2) queue_run_force = TRUE;
2651 if (i >= 2) deliver_selectstring_regex = TRUE;
2652 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2653 argrest += Ustrlen(rsopts[i]);
2654 }
2655 }
2656 }
2657
2658 /* -R: Set string to match in addresses for forced queue run to
2659 pick out particular messages. */
2660
2661 if (*argrest == 0)
2662 {
2663 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2664 {
2665 fprintf(stderr, "exim: string expected after -R\n");
2666 exit(EXIT_FAILURE);
2667 }
2668 }
2669 else deliver_selectstring = argrest;
2670 if (queue_interval < 0) queue_interval = 0;
2671 break;
2672
2673
2674 /* -r: an obsolete synonym for -f (see above) */
2675
2676
2677 /* -S: Like -R but works on sender. */
2678
2679 case 'S': /* Synonymous with -qS... */
2680 receiving_message = FALSE;
2681
2682 /* -Sf: As -S (below) but force all deliveries,
2683 -Sff: Ditto, but also thaw all frozen messages,
2684 -Sr: String is regex
2685 -Srf: Regex and force
2686 -Srff: Regex and force and thaw
2687
2688 in all cases provided there are no further characters in this
2689 argument. */
2690
2691 if (*argrest != 0)
2692 {
2693 int i;
2694 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2695 {
2696 if (Ustrcmp(argrest, rsopts[i]) == 0)
2697 {
2698 if (i != 2) queue_run_force = TRUE;
2699 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2700 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2701 argrest += Ustrlen(rsopts[i]);
2702 }
2703 }
2704 }
2705
2706 /* -S: Set string to match in addresses for forced queue run to
2707 pick out particular messages. */
2708
2709 if (*argrest == 0)
2710 {
2711 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2712 {
2713 fprintf(stderr, "exim: string expected after -S\n");
2714 exit(EXIT_FAILURE);
2715 }
2716 }
2717 else deliver_selectstring_sender = argrest;
2718 if (queue_interval < 0) queue_interval = 0;
2719 break;
2720
2721 /* -Tqt is an option that is exclusively for use by the testing suite.
2722 It is not recognized in other circumstances. It allows for the setting up
2723 of explicit "queue times" so that various warning/retry things can be
2724 tested. Otherwise variability of clock ticks etc. cause problems. */
2725
2726 case 'T':
2727 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2728 fudged_queue_times = argv[++i];
2729 else badarg = TRUE;
2730 break;
2731
2732
2733 /* -t: Set flag to extract recipients from body of message. */
2734
2735 case 't':
2736 if (*argrest == 0) extract_recipients = TRUE;
2737
2738 /* -ti: Set flag to extract recipients from body of message, and also
2739 specify that dot does not end the message. */
2740
2741 else if (Ustrcmp(argrest, "i") == 0)
2742 {
2743 extract_recipients = TRUE;
2744 dot_ends = FALSE;
2745 }
2746
2747 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2748
2749 #ifdef SUPPORT_TLS
2750 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2751 #endif
2752
2753 else badarg = TRUE;
2754 break;
2755
2756
2757 /* -U: This means "initial user submission" in sendmail, apparently. The
2758 doc claims that in future sendmail may refuse syntactically invalid
2759 messages instead of fixing them. For the moment, we just ignore it. */
2760
2761 case 'U':
2762 break;
2763
2764
2765 /* -v: verify things - this is a very low-level debugging */
2766
2767 case 'v':
2768 if (*argrest == 0)
2769 {
2770 debug_selector |= D_v;
2771 debug_file = stderr;
2772 }
2773 else badarg = TRUE;
2774 break;
2775
2776
2777 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2778
2779 The -x flag tells the sendmail command that mail from a local
2780 mail program has National Language Support (NLS) extended characters
2781 in the body of the mail item. The sendmail command can send mail with
2782 extended NLS characters across networks that normally corrupts these
2783 8-bit characters.
2784
2785 As Exim is 8-bit clean, it just ignores this flag. */
2786
2787 case 'x':
2788 if (*argrest != 0) badarg = TRUE;
2789 break;
2790
2791 /* All other initial characters are errors */
2792
2793 default:
2794 badarg = TRUE;
2795 break;
2796 } /* End of high-level switch statement */
2797
2798 /* Failed to recognize the option, or syntax error */
2799
2800 if (badarg)
2801 {
2802 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2803 "option %s\n", arg);
2804 exit(EXIT_FAILURE);
2805 }
2806 }
2807
2808
2809 /* Arguments have been processed. Check for incompatibilities. */
2810
2811 END_ARG:
2812 if ((
2813 (smtp_input || extract_recipients || recipients_arg < argc) &&
2814 (daemon_listen || queue_interval >= 0 || bi_option ||
2815 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2816 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2817 ) ||
2818 (
2819 msg_action_arg > 0 &&
2820 (daemon_listen || queue_interval >= 0 || list_options || checking ||
2821 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2822 ) ||
2823 (
2824 (daemon_listen || queue_interval >= 0) &&
2825 (sender_address != NULL || list_options || list_queue || checking ||
2826 bi_option)
2827 ) ||
2828 (
2829 daemon_listen && queue_interval == 0
2830 ) ||
2831 (
2832 list_options &&
2833 (checking || smtp_input || extract_recipients ||
2834 filter_test != FTEST_NONE || bi_option)
2835 ) ||
2836 (
2837 verify_address_mode &&
2838 (address_test_mode || smtp_input || extract_recipients ||
2839 filter_test != FTEST_NONE || bi_option)
2840 ) ||
2841 (
2842 address_test_mode && (smtp_input || extract_recipients ||
2843 filter_test != FTEST_NONE || bi_option)
2844 ) ||
2845 (
2846 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
2847 extract_recipients)
2848 ) ||
2849 (
2850 deliver_selectstring != NULL && queue_interval < 0
2851 )
2852 )
2853 {
2854 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
2855 exit(EXIT_FAILURE);
2856 }
2857
2858 /* If debugging is set up, set the file and the file descriptor to pass on to
2859 child processes. It should, of course, be 2 for stderr. Also, force the daemon
2860 to run in the foreground. */
2861
2862 if (debug_selector != 0)
2863 {
2864 debug_file = stderr;
2865 debug_fd = fileno(debug_file);
2866 background_daemon = FALSE;
2867 if (running_in_test_harness) millisleep(100); /* lets caller finish */
2868 if (debug_selector != D_v) /* -v only doesn't show this */
2869 {
2870 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
2871 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
2872 debug_selector);
2873 show_whats_supported(stderr);
2874 }
2875 }
2876
2877 /* When started with root privilege, ensure that the limits on the number of
2878 open files and the number of processes (where that is accessible) are
2879 sufficiently large, or are unset, in case Exim has been called from an
2880 environment where the limits are screwed down. Not all OS have the ability to
2881 change some of these limits. */
2882
2883 if (unprivileged)
2884 {
2885 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
2886 }
2887 else
2888 {
2889 struct rlimit rlp;
2890
2891 #ifdef RLIMIT_NOFILE
2892 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
2893 {
2894 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
2895 strerror(errno));
2896 rlp.rlim_cur = rlp.rlim_max = 0;
2897 }
2898
2899 /* I originally chose 1000 as a nice big number that was unlikely to
2900 be exceeded. It turns out that some older OS have a fixed upper limit of
2901 256. */
2902
2903 if (rlp.rlim_cur < 1000)
2904 {
2905 rlp.rlim_cur = rlp.rlim_max = 1000;
2906 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2907 {
2908 rlp.rlim_cur = rlp.rlim_max = 256;
2909 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
2910 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
2911 strerror(errno));
2912 }
2913 }
2914 #endif
2915
2916 #ifdef RLIMIT_NPROC
2917 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
2918 {
2919 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
2920 strerror(errno));
2921 rlp.rlim_cur = rlp.rlim_max = 0;
2922 }
2923
2924 #ifdef RLIM_INFINITY
2925 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
2926 {
2927 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
2928 #else
2929 if (rlp.rlim_cur < 1000)
2930 {
2931 rlp.rlim_cur = rlp.rlim_max = 1000;
2932 #endif
2933 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
2934 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
2935 strerror(errno));
2936 }
2937 #endif
2938 }
2939
2940 /* Exim is normally entered as root (but some special configurations are
2941 possible that don't do this). However, it always spins off sub-processes that
2942 set their uid and gid as required for local delivery. We don't want to pass on
2943 any extra groups that root may belong to, so we want to get rid of them all at
2944 this point.
2945
2946 We need to obey setgroups() at this stage, before possibly giving up root
2947 privilege for a changed configuration file, but later on we might need to
2948 check on the additional groups for the admin user privilege - can't do that
2949 till after reading the config, which might specify the exim gid. Therefore,
2950 save the group list here first. */
2951
2952 group_count = getgroups(NGROUPS_MAX, group_list);
2953
2954 /* There is a fundamental difference in some BSD systems in the matter of
2955 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
2956 known not to be different. On the "different" systems there is a single group
2957 list, and the first entry in it is the current group. On all other versions of
2958 Unix there is a supplementary group list, which is in *addition* to the current
2959 group. Consequently, to get rid of all extraneous groups on a "standard" system
2960 you pass over 0 groups to setgroups(), while on a "different" system you pass
2961 over a single group - the current group, which is always the first group in the
2962 list. Calling setgroups() with zero groups on a "different" system results in
2963 an error return. The following code should cope with both types of system.
2964
2965 However, if this process isn't running as root, setgroups() can't be used
2966 since you have to be root to run it, even if throwing away groups. Not being
2967 root here happens only in some unusual configurations. We just ignore the
2968 error. */
2969
2970 if (setgroups(0, NULL) != 0)
2971 {
2972 if (setgroups(1, group_list) != 0 && !unprivileged)
2973 {
2974 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
2975 exit(EXIT_FAILURE);
2976 }
2977 }
2978
2979 /* If the configuration file name has been altered by an argument on the
2980 command line (either a new file name or a macro definition) and the caller is
2981 not root or the exim user, or if this is a filter testing run, remove any
2982 setuid privilege the program has, and run as the underlying user.
2983
2984 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
2985 severely restricts the use of -C for some purposes.
2986
2987 Otherwise, set the real ids to the effective values (should be root unless run
2988 from inetd, which it can either be root or the exim uid, if one is configured).
2989
2990 There is a private mechanism for bypassing some of this, in order to make it
2991 possible to test lots of configurations automatically, without having either to
2992 recompile each time, or to patch in an actual configuration file name and other
2993 values (such as the path name). If running in the test harness, pretend that
2994 configuration file changes and macro definitions haven't happened. */
2995
2996 if (( /* EITHER */
2997 (config_changed || macros != NULL) && /* Config changed, and */
2998 real_uid != root_uid && /* Not root, and */
2999 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3000 real_uid != exim_uid && /* Not exim, and */
3001 #endif
3002 !running_in_test_harness /* Not fudged */
3003 ) || /* OR */
3004 expansion_test /* expansion testing */
3005 || /* OR */
3006 filter_test != FTEST_NONE) /* Filter testing */
3007 {
3008 setgroups(group_count, group_list);
3009 exim_setugid(real_uid, real_gid, FALSE,
3010 US"-C, -D, -be or -bf forces real uid");
3011 removed_privilege = TRUE;
3012
3013 /* In the normal case when Exim is called like this, stderr is available
3014 and should be used for any logging information because attempts to write
3015 to the log will usually fail. To arrange this, we unset really_exim. However,
3016 if no stderr is available there is no point - we might as well have a go
3017 at the log (if it fails, syslog will be written). */
3018
3019 if (log_stderr != NULL) really_exim = FALSE;
3020 }
3021
3022 /* Privilege is to be retained for the moment. It may be dropped later,
3023 depending on the job that this Exim process has been asked to do. For now, set
3024 the real uid to the effective so that subsequent re-execs of Exim are done by a
3025 privileged user. */
3026
3027 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3028
3029 /* If testing a filter, open the file(s) now, before wasting time doing other
3030 setups and reading the message. */
3031
3032 if ((filter_test & FTEST_SYSTEM) != 0)
3033 {
3034 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3035 if (filter_sfd < 0)
3036 {
3037 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3038 strerror(errno));
3039 return EXIT_FAILURE;
3040 }
3041 }
3042
3043 if ((filter_test & FTEST_USER) != 0)
3044 {
3045 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3046 if (filter_ufd < 0)
3047 {
3048 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3049 strerror(errno));
3050 return EXIT_FAILURE;
3051 }
3052 }
3053
3054 /* Read the main runtime configuration data; this gives up if there
3055 is a failure. It leaves the configuration file open so that the subsequent
3056 configuration data for delivery can be read if needed. */
3057
3058 readconf_main();
3059
3060 /* Handle the decoding of logging options. */
3061
3062 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3063 log_options, log_options_count, US"log");
3064
3065 DEBUG(D_any)
3066 {
3067 debug_printf("configuration file is %s\n", config_main_filename);
3068 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3069 log_extra_selector);
3070 }
3071
3072 /* If domain literals are not allowed, check the sender address that was
3073 supplied with -f. Ditto for a stripped trailing dot. */
3074
3075 if (sender_address != NULL)
3076 {
3077 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3078 {
3079 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3080 "allowed\n", sender_address);
3081 return EXIT_FAILURE;
3082 }
3083 if (f_end_dot && !strip_trailing_dot)
3084 {
3085 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3086 "(trailing dot not allowed)\n", sender_address);
3087 return EXIT_FAILURE;
3088 }
3089 }
3090
3091 /* Paranoia check of maximum lengths of certain strings. There is a check
3092 on the length of the log file path in log.c, which will come into effect
3093 if there are any calls to write the log earlier than this. However, if we
3094 get this far but the string is very long, it is better to stop now than to
3095 carry on and (e.g.) receive a message and then have to collapse. The call to
3096 log_write() from here will cause the ultimate panic collapse if the complete
3097 file name exceeds the buffer length. */
3098
3099 if (Ustrlen(log_file_path) > 200)
3100 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3101 "log_file_path is longer than 200 chars: aborting");
3102
3103 if (Ustrlen(pid_file_path) > 200)
3104 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3105 "pid_file_path is longer than 200 chars: aborting");
3106
3107 if (Ustrlen(spool_directory) > 200)
3108 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3109 "spool_directory is longer than 200 chars: aborting");
3110
3111 /* Length check on the process name given to syslog for its TAG field,
3112 which is only permitted to be 32 characters or less. See RFC 3164. */
3113
3114 if (Ustrlen(syslog_processname) > 32)
3115 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3116 "syslog_processname is longer than 32 chars: aborting");
3117
3118 /* In some operating systems, the environment variable TMPDIR controls where
3119 temporary files are created; Exim doesn't use these (apart from when delivering
3120 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3121 If TMPDIR is found in the environment, reset it to the value defined in the
3122 TMPDIR macro, if this macro is defined. */
3123
3124 #ifdef TMPDIR
3125 {
3126 uschar **p;
3127 for (p = USS environ; *p != NULL; p++)
3128 {
3129 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3130 Ustrcmp(*p+7, TMPDIR) != 0)
3131 {
3132 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3133 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3134 *p = newp;
3135 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3136 }
3137 }
3138 }
3139 #endif
3140
3141 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3142 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3143 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3144 called by a user who has set the TZ variable. This then affects the timestamps
3145 in log files and in Received: headers, and any created Date: header lines. The
3146 required timezone is settable in the configuration file, so nothing can be done
3147 about this earlier - but hopefully nothing will normally be logged earlier than
3148 this. We have to make a new environment if TZ is wrong, but don't bother if
3149 timestamps_utc is set, because then all times are in UTC anyway. */
3150
3151 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3152 {
3153 timestamps_utc = TRUE;
3154 }
3155 else
3156 {
3157 uschar *envtz = US getenv("TZ");
3158 if ((envtz == NULL && timezone_string != NULL) ||
3159 (envtz != NULL &&
3160 (timezone_string == NULL ||
3161 Ustrcmp(timezone_string, envtz) != 0)))
3162 {
3163 uschar **p = USS environ;
3164 uschar **new;
3165 uschar **newp;
3166 int count = 0;
3167 while (*p++ != NULL) count++;
3168 if (envtz == NULL) count++;
3169 newp = new = malloc(sizeof(uschar *) * (count + 1));
3170 for (p = USS environ; *p != NULL; p++)
3171 {
3172 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3173 *newp++ = *p;
3174 }
3175 if (timezone_string != NULL)
3176 {
3177 *newp = malloc(Ustrlen(timezone_string) + 4);
3178 sprintf(CS *newp++, "TZ=%s", timezone_string);
3179 }
3180 *newp = NULL;
3181 environ = CSS new;
3182 tzset();
3183 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3184 tod_stamp(tod_log));
3185 }
3186 }
3187
3188 /* Handle the case when we have removed the setuid privilege because of -C or
3189 -D. This means that the caller of Exim was not root, and, provided that
3190 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3191 the binary.
3192
3193 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3194 were running as the exim user defined in the configuration file (different to
3195 the one in the binary). The sysadmin may expect this case to retain privilege
3196 because "the binary was called by the Exim user", but it hasn't, because of the
3197 order in which it handles this stuff. There are two possibilities:
3198
3199 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3200 to do message deliveries. Thus, the fact that it is running as a
3201 non-privileged user is plausible, and might be wanted in some special
3202 configurations. However, really_exim will have been set false when
3203 privilege was dropped, to stop Exim trying to write to its normal log
3204 files. Therefore, re-enable normal log processing, assuming the sysadmin
3205 has set up the log directory correctly.
3206
3207 (2) If deliver_drop_privilege is not set, the configuration won't work as
3208 apparently intended, and so we log a panic message. In order to retain
3209 root for -C or -D, the caller must either be root or the Exim user
3210 defined in the binary (when deliver_drop_ privilege is false).
3211
3212 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3213 built-in exim user or one defined in the configuration. In either event,
3214 re-enable log processing, assuming the sysadmin knows what they are doing. */
3215
3216 if (removed_privilege && (config_changed || macros != NULL) &&
3217 real_uid == exim_uid)
3218 {
3219 #ifdef ALT_CONFIG_ROOT_ONLY
3220 really_exim = TRUE; /* let logging work normally */
3221 #else
3222
3223 if (deliver_drop_privilege)
3224 really_exim = TRUE; /* let logging work normally */
3225 else
3226 log_write(0, LOG_MAIN|LOG_PANIC,
3227 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3228 (int)exim_uid, config_changed? "-C" : "-D");
3229 #endif
3230 }
3231
3232 /* Start up Perl interpreter if Perl support is configured and there is a
3233 perl_startup option, and the configuration or the command line specifies
3234 initializing starting. Note that the global variables are actually called
3235 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3236
3237 #ifdef EXIM_PERL
3238 if (perl_start_option != 0)
3239 opt_perl_at_start = (perl_start_option > 0);
3240 if (opt_perl_at_start && opt_perl_startup != NULL)
3241 {
3242 uschar *errstr;
3243 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3244 errstr = init_perl(opt_perl_startup);
3245 if (errstr != NULL)
3246 {
3247 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3248 return EXIT_FAILURE;
3249 }
3250 opt_perl_started = TRUE;
3251 }
3252 #endif /* EXIM_PERL */
3253
3254 /* Log the arguments of the call if the configuration file said so. This is
3255 a debugging feature for finding out what arguments certain MUAs actually use.
3256 Don't attempt it if logging is disabled, or if listing variables or if
3257 verifying/testing addresses or expansions. */
3258
3259 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3260 && really_exim && !list_options && !checking)
3261 {
3262 int i;
3263 uschar *p = big_buffer;
3264 Ustrcpy(p, "cwd=");
3265 (void)getcwd(CS p+4, big_buffer_size - 4);
3266 while (*p) p++;
3267 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3268 while (*p) p++;
3269 for (i = 0; i < argc; i++)
3270 {
3271 int len = Ustrlen(argv[i]);
3272 uschar *printing;
3273 uschar *quote;
3274 if (p + len + 8 >= big_buffer + big_buffer_size)
3275 {
3276 Ustrcpy(p, " ...");
3277 log_write(0, LOG_MAIN, "%s", big_buffer);
3278 Ustrcpy(big_buffer, "...");
3279 p = big_buffer + 3;
3280 }
3281 printing = string_printing(argv[i]);
3282 if (printing[0] == 0) quote = US"\""; else
3283 {
3284 uschar *pp = printing;
3285 quote = US"";
3286 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3287 }
3288 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3289 (p - big_buffer) - 4), printing, quote);
3290 while (*p) p++;
3291 }
3292
3293 if ((log_extra_selector & LX_arguments) != 0)
3294 log_write(0, LOG_MAIN, "%s", big_buffer);
3295 else
3296 debug_printf("%s\n", big_buffer);
3297 }
3298
3299 /* Set the working directory to be the top-level spool directory. We don't rely
3300 on this in the code, which always uses fully qualified names, but it's useful
3301 for core dumps etc. Don't complain if it fails - the spool directory might not
3302 be generally accessible and calls with the -C option (and others) have lost
3303 privilege by now. */
3304
3305 if (Uchdir(spool_directory) != 0)
3306 {
3307 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, TRUE);
3308 (void)Uchdir(spool_directory);
3309 }
3310
3311 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3312 alias file. Exim doesn't have such a concept, but this call is screwed into
3313 Sun's YP makefiles. Handle this by calling a configured script, as the real
3314 user who called Exim. The -oA option can be used to pass an argument to the
3315 script. */
3316
3317 if (bi_option)
3318 {
3319 (void)fclose(config_file);
3320 if (bi_command != NULL)
3321 {
3322 int i = 0;
3323 uschar *argv[3];
3324 argv[i++] = bi_command;
3325 if (alias_arg != NULL) argv[i++] = alias_arg;
3326 argv[i++] = NULL;
3327
3328 setgroups(group_count, group_list);
3329 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3330
3331 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3332 (argv[1] == NULL)? US"" : argv[1]);
3333
3334 execv(CS argv[0], (char *const *)argv);
3335 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3336 exit(EXIT_FAILURE);
3337 }
3338 else
3339 {
3340 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3341 exit(EXIT_SUCCESS);
3342 }
3343 }
3344
3345 /* If an action on specific messages is requested, or if a daemon or queue
3346 runner is being started, we need to know if Exim was called by an admin user.
3347 This is the case if the real user is root or exim, or if the real group is
3348 exim, or if one of the supplementary groups is exim or a group listed in
3349 admin_groups. We don't fail all message actions immediately if not admin_user,
3350 since some actions can be performed by non-admin users. Instead, set admin_user
3351 for later interrogation. */
3352
3353 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3354 admin_user = TRUE;
3355 else
3356 {
3357 int i, j;
3358
3359 for (i = 0; i < group_count; i++)
3360 {
3361 if (group_list[i] == exim_gid) admin_user = TRUE;
3362 else if (admin_groups != NULL)
3363 {
3364 for (j = 1; j <= (int)(admin_groups[0]); j++)
3365 if (admin_groups[j] == group_list[i])
3366 { admin_user = TRUE; break; }
3367 }
3368 if (admin_user) break;
3369 }
3370 }
3371
3372 /* Another group of privileged users are the trusted users. These are root,
3373 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3374 are permitted to specify sender_addresses with -f on the command line, and
3375 other message parameters as well. */
3376
3377 if (real_uid == root_uid || real_uid == exim_uid)
3378 trusted_caller = TRUE;
3379 else
3380 {
3381 int i, j;
3382
3383 if (trusted_users != NULL)
3384 {
3385 for (i = 1; i <= (int)(trusted_users[0]); i++)
3386 if (trusted_users[i] == real_uid)
3387 { trusted_caller = TRUE; break; }
3388 }
3389
3390 if (!trusted_caller && trusted_groups != NULL)
3391 {
3392 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3393 {
3394 if (trusted_groups[i] == real_gid)
3395 trusted_caller = TRUE;
3396 else for (j = 0; j < group_count; j++)
3397 {
3398 if (trusted_groups[i] == group_list[j])
3399 { trusted_caller = TRUE; break; }
3400 }
3401 if (trusted_caller) break;
3402 }
3403 }
3404 }
3405
3406 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3407 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3408
3409 /* Only an admin user may start the daemon or force a queue run in the default
3410 configuration, but the queue run restriction can be relaxed. Only an admin
3411 user may request that a message be returned to its sender forthwith. Only an
3412 admin user may specify a debug level greater than D_v (because it might show
3413 passwords, etc. in lookup queries). Only an admin user may request a queue
3414 count. */
3415
3416 if (!admin_user)
3417 {
3418 BOOL debugset = (debug_selector & ~D_v) != 0;
3419 if (deliver_give_up || daemon_listen ||
3420 (count_queue && queue_list_requires_admin) ||
3421 (list_queue && queue_list_requires_admin) ||
3422 (queue_interval >= 0 && prod_requires_admin) ||
3423 (debugset && !running_in_test_harness))
3424 {
3425 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3426 exit(EXIT_FAILURE);
3427 }
3428 }
3429
3430 /* If the real user is not root or the exim uid, the argument for passing
3431 in an open TCP/IP connection for another message is not permitted, nor is
3432 running with the -N option for any delivery action, unless this call to exim is
3433 one that supplied an input message, or we are using a patched exim for
3434 regression testing. */
3435
3436 if (real_uid != root_uid && real_uid != exim_uid &&
3437 (continue_hostname != NULL ||
3438 (dont_deliver &&
3439 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3440 )) && !running_in_test_harness)
3441 {
3442 fprintf(stderr, "exim: Permission denied\n");
3443 return EXIT_FAILURE;
3444 }
3445
3446 /* If the caller is not trusted, certain arguments are ignored when running for
3447 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3448 Note that authority for performing certain actions on messages is tested in the
3449 queue_action() function. */
3450
3451 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3452 {
3453 sender_host_name = sender_host_address = interface_address =
3454 sender_ident = received_protocol = NULL;
3455 sender_host_port = interface_port = 0;
3456 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3457 }
3458
3459 /* If a sender host address is set, extract the optional port number off the
3460 end of it and check its syntax. Do the same thing for the interface address.
3461 Exim exits if the syntax is bad. */
3462
3463 else
3464 {
3465 if (sender_host_address != NULL)
3466 sender_host_port = check_port(sender_host_address);
3467 if (interface_address != NULL)
3468 interface_port = check_port(interface_address);
3469 }
3470
3471 /* If an SMTP message is being received check to see if the standard input is a
3472 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3473 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3474 barf. */
3475
3476 if (smtp_input)
3477 {
3478 union sockaddr_46 inetd_sock;
3479 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3480 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3481 {
3482 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3483 if (family == AF_INET || family == AF_INET6)
3484 {
3485 union sockaddr_46 interface_sock;
3486 size = sizeof(interface_sock);
3487
3488 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3489 interface_address = host_ntoa(-1, &interface_sock, NULL,
3490 &interface_port);
3491
3492 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3493
3494 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3495 {
3496 is_inetd = TRUE;
3497 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3498 NULL, &sender_host_port);
3499 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3500 "inetd is not supported when mua_wrapper is set");
3501 }
3502 else
3503 {
3504 fprintf(stderr,
3505 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3506 return EXIT_FAILURE;
3507 }
3508 }
3509 }
3510 }
3511
3512 /* If the load average is going to be needed while receiving a message, get it
3513 now for those OS that require the first call to os_getloadavg() to be done as
3514 root. There will be further calls later for each message received. */
3515
3516 #ifdef LOAD_AVG_NEEDS_ROOT
3517 if (receiving_message &&
3518 (queue_only_load >= 0 ||
3519 (is_inetd && smtp_load_reserve >= 0)
3520 ))
3521 {
3522 load_average = os_getloadavg();
3523 }
3524 #endif
3525
3526 /* The queue_only configuration option can be overridden by -odx on the command
3527 line, except that if queue_only_override is false, queue_only cannot be unset
3528 from the command line. */
3529
3530 if (queue_only_set && (queue_only_override || arg_queue_only))
3531 queue_only = arg_queue_only;
3532
3533 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3534 -or and -os. */
3535
3536 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3537 if (arg_smtp_receive_timeout >= 0)
3538 smtp_receive_timeout = arg_smtp_receive_timeout;
3539
3540 /* If Exim was started with root privilege, unless we have already removed the
3541 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3542 except when starting the daemon or doing some kind of delivery or address
3543 testing (-bt). These are the only cases when root need to be retained. We run
3544 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3545 retained only for starting the daemon. */
3546
3547 if (!unprivileged && /* originally had root AND */
3548 !removed_privilege && /* still got root AND */
3549 !daemon_listen && /* not starting the daemon */
3550 queue_interval <= 0 && /* (either kind of daemon) */
3551 ( /* AND EITHER */
3552 deliver_drop_privilege || /* requested unprivileged */
3553 ( /* OR */
3554 queue_interval < 0 && /* not running the queue */
3555 (msg_action_arg < 0 || /* and */
3556 msg_action != MSG_DELIVER) && /* not delivering and */
3557 (!checking || !address_test_mode) /* not address checking */
3558 )
3559 ))
3560 {
3561 exim_setugid(exim_uid, exim_gid, FALSE, US"privilege not needed");
3562 }
3563
3564 /* When we are retaining a privileged uid, we still change to the exim gid. */
3565
3566 else setgid(exim_gid);
3567
3568 /* Handle a request to list the delivery queue */
3569
3570 if (list_queue)
3571 {
3572 set_process_info("listing the queue");
3573 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3574 exit(EXIT_SUCCESS);
3575 }
3576
3577 /* Handle a request to count the delivery queue */
3578
3579 if (count_queue)
3580 {
3581 set_process_info("counting the queue");
3582 queue_count();
3583 exit(EXIT_SUCCESS);
3584 }
3585
3586 /* Handle actions on specific messages, except for the force delivery action,
3587 which is done below. Some actions take a whole list of message ids, which
3588 are known to continue up to the end of the arguments. Others take a single
3589 message id and then operate on the recipients list. */
3590
3591 if (msg_action_arg > 0 && msg_action != MSG_DELIVER)
3592 {
3593 int yield = EXIT_SUCCESS;
3594 set_process_info("acting on specified messages");
3595
3596 if (!one_msg_action)
3597 {
3598 for (i = msg_action_arg; i < argc; i++)
3599 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3600 yield = EXIT_FAILURE;
3601 }
3602
3603 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3604 recipients_arg)) yield = EXIT_FAILURE;
3605 exit(yield);
3606 }
3607
3608 /* All the modes below here require the remaining configuration sections
3609 to be read, except that we can skip over the ACL setting when delivering
3610 specific messages, or doing a queue run. (For various testing cases we could
3611 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3612 for skipping. */
3613
3614 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3615
3616 /* The configuration data will have been read into POOL_PERM because we won't
3617 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3618 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3619 configuration were read into POOL_MAIN, because we don't do any resets till
3620 later on. However, it seems right, and it does ensure that both pools get used.
3621 */
3622
3623 store_pool = POOL_MAIN;
3624
3625 /* Handle the -brt option. This is for checking out retry configurations.
3626 The next three arguments are a domain name or a complete address, and
3627 optionally two error numbers. All it does is to call the function that
3628 scans the retry configuration data. */
3629
3630 if (test_retry_arg >= 0)
3631 {
3632 retry_config *yield;
3633 int basic_errno = 0;
3634 int more_errno = 0;
3635 uschar *s1, *s2;
3636
3637 if (test_retry_arg >= argc)
3638 {
3639 printf("-brt needs a domain or address argument\n");
3640 exim_exit(EXIT_FAILURE);
3641 }
3642 s1 = argv[test_retry_arg++];
3643 s2 = NULL;
3644
3645 /* If the first argument contains no @ and no . it might be a local user
3646 or it might be a single-component name. Treat as a domain. */
3647
3648 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3649 {
3650 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3651 "being \ntreated as a one-component domain, not as a local part.\n\n",
3652 s1);
3653 }
3654
3655 /* There may be an optional second domain arg. */
3656
3657 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3658 s2 = argv[test_retry_arg++];
3659
3660 /* The final arg is an error name */
3661
3662 if (test_retry_arg < argc)
3663 {
3664 uschar *ss = argv[test_retry_arg];
3665 uschar *error =
3666 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3667 if (error != NULL)
3668 {
3669 printf("%s\n", CS error);
3670 return EXIT_FAILURE;
3671 }
3672
3673 /* For the rcpt_4xx errors, a value of 255 means "any", and a code > 100 as
3674 an error is for matching codes to the decade. Turn them into a real error
3675 code, off the decade. */
3676
3677 if (basic_errno == ERRNO_RCPT4XX)
3678 {
3679 int code = (more_errno >> 8) & 255;
3680 if (code == 255)
3681 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3682 else if (code > 100)
3683 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3684 }
3685 }
3686
3687 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3688 if (yield == NULL) printf("No retry information found\n"); else
3689 {
3690 retry_rule *r;
3691 more_errno = yield->more_errno;
3692 printf("Retry rule: %s ", yield->pattern);
3693
3694 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3695 {
3696 printf("quota%s%s ",
3697 (more_errno > 0)? "_" : "",
3698 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3699 }
3700 else if (yield->basic_errno == ECONNREFUSED)
3701 {
3702 printf("refused%s%s ",
3703 (more_errno > 0)? "_" : "",
3704 (more_errno == 'M')? "MX" :
3705 (more_errno == 'A')? "A" : "");
3706 }
3707 else if (yield->basic_errno == ETIMEDOUT)
3708 {
3709 printf("timeout");
3710 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3711 more_errno &= 255;
3712 if (more_errno != 0) printf("_%s",
3713 (more_errno == 'M')? "MX" : "A");
3714 printf(" ");
3715 }
3716 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3717 printf("auth_failed ");
3718 else printf("* ");
3719
3720 for (r = yield->rules; r != NULL; r = r->next)
3721 {
3722 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3723 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3724 if (r->rule == 'G')
3725 {
3726 int x = r->p2;
3727 int f = x % 1000;
3728 int d = 100;
3729 printf(",%d.", x/1000);
3730 do
3731 {
3732 printf("%d", f/d);
3733 f %= d;
3734 d /= 10;
3735 }
3736 while (f != 0);
3737 }
3738 printf("; ");
3739 }
3740
3741 printf("\n");
3742 }
3743 exim_exit(EXIT_SUCCESS);
3744 }
3745
3746 /* Handle a request to list one or more configuration options */
3747
3748 if (list_options)
3749 {
3750 set_process_info("listing variables");
3751 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3752 else for (i = recipients_arg; i < argc; i++)
3753 {
3754 if (i < argc - 1 &&
3755 (Ustrcmp(argv[i], "router") == 0 ||
3756 Ustrcmp(argv[i], "transport") == 0 ||
3757 Ustrcmp(argv[i], "authenticator") == 0))
3758 {
3759 readconf_print(argv[i+1], argv[i]);
3760 i++;
3761 }
3762 else readconf_print(argv[i], NULL);
3763 }
3764 exim_exit(EXIT_SUCCESS);
3765 }
3766
3767
3768 /* Handle a request to deliver one or more messages that are already on the
3769 queue. Values of msg_action other than MSG_DELIVER are dealt with above. This
3770 is typically used for a small number when prodding by hand (when the option
3771 forced_delivery will be set) or when re-execing to regain root privilege.
3772 Each message delivery must happen in a separate process, so we fork a process
3773 for each one, and run them sequentially so that debugging output doesn't get
3774 intertwined, and to avoid spawning too many processes if a long list is given.
3775 However, don't fork for the last one; this saves a process in the common case
3776 when Exim is called to deliver just one message. */
3777
3778 if (msg_action_arg > 0)
3779 {
3780 if (prod_requires_admin && !admin_user)
3781 {
3782 fprintf(stderr, "exim: Permission denied\n");
3783 exim_exit(EXIT_FAILURE);
3784 }
3785 set_process_info("delivering specified messages");
3786 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3787 for (i = msg_action_arg; i < argc; i++)
3788 {
3789 int status;
3790 pid_t pid;
3791 if (i == argc - 1)
3792 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3793 else if ((pid = fork()) == 0)
3794 {
3795 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3796 _exit(EXIT_SUCCESS);
3797 }
3798 else if (pid < 0)
3799 {
3800 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3801 strerror(errno));
3802 exim_exit(EXIT_FAILURE);
3803 }
3804 else wait(&status);
3805 }
3806 exim_exit(EXIT_SUCCESS);
3807 }
3808
3809
3810 /* If only a single queue run is requested, without SMTP listening, we can just
3811 turn into a queue runner, with an optional starting message id. */
3812
3813 if (queue_interval == 0 && !daemon_listen)
3814 {
3815 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3816 (start_queue_run_id == NULL)? US"" : US" starting at ",
3817 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
3818 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
3819 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
3820 set_process_info("running the queue (single queue run)");
3821 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
3822 exim_exit(EXIT_SUCCESS);
3823 }
3824
3825
3826 /* Find the login name of the real user running this process. This is always
3827 needed when receiving a message, because it is written into the spool file. It
3828 may also be used to construct a from: or a sender: header, and in this case we
3829 need the user's full name as well, so save a copy of it, checked for RFC822
3830 syntax and munged if necessary, if it hasn't previously been set by the -F
3831 argument. We may try to get the passwd entry more than once, in case NIS or
3832 other delays are in evidence. Save the home directory for use in filter testing
3833 (only). */
3834
3835 for (i = 0;;)
3836 {
3837 if ((pw = getpwuid(real_uid)) != NULL)
3838 {
3839 originator_login = string_copy(US pw->pw_name);
3840 originator_home = string_copy(US pw->pw_dir);
3841
3842 /* If user name has not been set by -F, set it from the passwd entry
3843 unless -f has been used to set the sender address by a trusted user. */
3844
3845 if (originator_name == NULL)
3846 {
3847 if (sender_address == NULL ||
3848 (!trusted_caller && filter_test == FTEST_NONE))
3849 {
3850 uschar *name = US pw->pw_gecos;
3851 uschar *amp = Ustrchr(name, '&');
3852 uschar buffer[256];
3853
3854 /* Most Unix specify that a '&' character in the gecos field is
3855 replaced by a copy of the login name, and some even specify that
3856 the first character should be upper cased, so that's what we do. */
3857
3858 if (amp != NULL)
3859 {
3860 int loffset;
3861 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
3862 amp - name, name, &loffset, originator_login, amp + 1);
3863 buffer[loffset] = toupper(buffer[loffset]);
3864 name = buffer;
3865 }
3866
3867 /* If a pattern for matching the gecos field was supplied, apply
3868 it and then expand the name string. */
3869
3870 if (gecos_pattern != NULL && gecos_name != NULL)
3871 {
3872 const pcre *re;
3873 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
3874
3875 if (regex_match_and_setup(re, name, 0, -1))
3876 {
3877 uschar *new_name = expand_string(gecos_name);
3878 expand_nmax = -1;
3879 if (new_name != NULL)
3880 {
3881 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
3882 "gecos field \"%s\"\n", new_name, name);
3883 name = new_name;
3884 }
3885 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
3886 "\"%s\": %s\n", gecos_name, expand_string_message);
3887 }
3888 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
3889 "gecos field \"%s\"\n", gecos_pattern, name);
3890 store_free((void *)re);
3891 }
3892 originator_name = string_copy(name);
3893 }
3894
3895 /* A trusted caller has used -f but not -F */
3896
3897 else originator_name = US"";
3898 }
3899
3900 /* Break the retry loop */
3901
3902 break;
3903 }
3904
3905 if (++i > finduser_retries) break;
3906 sleep(1);
3907 }
3908
3909 /* If we cannot get a user login, log the incident and give up, unless the
3910 configuration specifies something to use. When running in the test harness,
3911 any setting of unknown_login overrides the actual login name. */
3912
3913 if (originator_login == NULL || running_in_test_harness)
3914 {
3915 if (unknown_login != NULL)
3916 {
3917 originator_login = expand_string(unknown_login);
3918 if (originator_name == NULL && unknown_username != NULL)
3919 originator_name = expand_string(unknown_username);
3920 if (originator_name == NULL) originator_name = US"";
3921 }
3922 if (originator_login == NULL)
3923 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
3924 (int)real_uid);
3925 }
3926
3927 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
3928 RFC822 address.*/
3929
3930 originator_name = string_copy(parse_fix_phrase(originator_name,
3931 Ustrlen(originator_name), big_buffer, big_buffer_size));
3932
3933 /* If a message is created by this call of Exim, the uid/gid of its originator
3934 are those of the caller. These values are overridden if an existing message is
3935 read in from the spool. */
3936
3937 originator_uid = real_uid;
3938 originator_gid = real_gid;
3939
3940 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
3941 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
3942
3943 /* Run in daemon and/or queue-running mode. The function daemon_go() never
3944 returns. We leave this till here so that the originator_ fields are available
3945 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
3946 mode. */
3947
3948 if (daemon_listen || queue_interval > 0)
3949 {
3950 if (mua_wrapper)
3951 {
3952 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
3953 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
3954 "mua_wrapper is set");
3955 }
3956 daemon_go();
3957 }
3958
3959 /* If the sender ident has not been set (by a trusted caller) set it to
3960 the caller. This will get overwritten below for an inetd call. If a trusted
3961 caller has set it empty, unset it. */
3962
3963 if (sender_ident == NULL) sender_ident = originator_login;
3964 else if (sender_ident[0] == 0) sender_ident = NULL;
3965
3966 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
3967 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
3968 originator_* variables set. */
3969
3970 if (test_rewrite_arg >= 0)
3971 {
3972 really_exim = FALSE;
3973 if (test_rewrite_arg >= argc)
3974 {
3975 printf("-brw needs an address argument\n");
3976 exim_exit(EXIT_FAILURE);
3977 }
3978 rewrite_test(argv[test_rewrite_arg]);
3979 exim_exit(EXIT_SUCCESS);
3980 }
3981
3982 /* A locally-supplied message is considered to be coming from a local user
3983 unless a trusted caller supplies a sender address with -f, or is passing in the
3984 message via SMTP (inetd invocation or otherwise). */
3985
3986 if ((sender_address == NULL && !smtp_input) ||
3987 (!trusted_caller && filter_test == FTEST_NONE))
3988 {
3989 sender_local = TRUE;
3990
3991 /* A trusted caller can supply authenticated_sender and authenticated_id
3992 via -oMas and -oMai and if so, they will already be set. */
3993
3994 if (authenticated_sender == NULL)
3995 authenticated_sender = string_sprintf("%s@%s", originator_login,
3996 qualify_domain_sender);
3997 if (authenticated_id == NULL) authenticated_id = originator_login;
3998 }
3999
4000 /* Trusted callers are always permitted to specify the sender address.
4001 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4002 is specified is the empty address. However, if a trusted caller does not
4003 specify a sender address for SMTP input, we leave sender_address unset. This
4004 causes the MAIL commands to be honoured. */
4005
4006 if ((!smtp_input && sender_address == NULL) ||
4007 !receive_check_set_sender(sender_address))
4008 {
4009 /* Either the caller is not permitted to set a general sender, or this is
4010 non-SMTP input and the trusted caller has not set a sender. If there is no
4011 sender, or if a sender other than <> is set, override with the originator's
4012 login (which will get qualified below), except when checking things. */
4013
4014 if (sender_address == NULL /* No sender_address set */
4015 || /* OR */
4016 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4017 !checking && /* Not running tests, AND */
4018 filter_test == FTEST_NONE)) /* Not testing a filter */
4019 {
4020 sender_address = originator_login;
4021 sender_address_forced = FALSE;
4022 sender_address_domain = 0;
4023 }
4024 }
4025
4026 /* Remember whether an untrusted caller set the sender address */
4027
4028 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4029
4030 /* Ensure that the sender address is fully qualified unless it is the empty
4031 address, which indicates an error message, or doesn't exist (root caller, smtp
4032 interface, no -f argument). */
4033
4034 if (sender_address != NULL && sender_address[0] != 0 &&
4035 sender_address_domain == 0)
4036 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4037 qualify_domain_sender);
4038
4039 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4040
4041 /* Handle a request to verify a list of addresses, or test them for delivery.
4042 This must follow the setting of the sender address, since routers can be
4043 predicated upon the sender. If no arguments are given, read addresses from
4044 stdin. Set debug_level to at least D_v to get full output for address testing.
4045 */
4046
4047 if (verify_address_mode || address_test_mode)
4048 {
4049 int exit_value = 0;
4050 int flags = vopt_qualify;
4051
4052 if (verify_address_mode)
4053 {
4054 if (!verify_as_sender) flags |= vopt_is_recipient;
4055 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4056 }
4057
4058 else
4059 {
4060 flags |= vopt_is_recipient;
4061 debug_selector |= D_v;
4062 debug_file = stderr;
4063 debug_fd = fileno(debug_file);
4064 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4065 }
4066
4067 if (recipients_arg < argc)
4068 {
4069 while (recipients_arg < argc)
4070 {
4071 uschar *s = argv[recipients_arg++];
4072 while (*s != 0)
4073 {
4074 BOOL finished = FALSE;
4075 uschar *ss = parse_find_address_end(s, FALSE);
4076 if (*ss == ',') *ss = 0; else finished = TRUE;
4077 test_address(s, flags, &exit_value);
4078 s = ss;
4079 if (!finished)
4080 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4081 }
4082 }
4083 }
4084
4085 else for (;;)
4086 {
4087 uschar *s = get_stdinput(NULL, NULL);
4088 if (s == NULL) break;
4089 test_address(s, flags, &exit_value);
4090 }
4091
4092 route_tidyup();
4093 exim_exit(exit_value);
4094 }
4095
4096 /* Handle expansion checking */
4097
4098 if (expansion_test)
4099 {
4100 if (recipients_arg < argc)
4101 {
4102