cd42a88ad51cb9c822fa6db2d4b06706ef9971de
[exim.git] / src / src / exim.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8
9 /* The main function: entry point, initialization, and high-level control.
10 Also a few functions that don't naturally fit elsewhere. */
11
12
13 #include "exim.h"
14
15 #if defined(__GLIBC__) && !defined(__UCLIBC__)
16 # include <gnu/libc-version.h>
17 #endif
18
19 #ifdef USE_GNUTLS
20 # include <gnutls/gnutls.h>
21 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
22 # define DISABLE_OCSP
23 # endif
24 #endif
25
26 #ifndef _TIME_H
27 # include <time.h>
28 #endif
29
30 extern void init_lookup_list(void);
31
32
33
34 /*************************************************
35 * Function interface to store functions *
36 *************************************************/
37
38 /* We need some real functions to pass to the PCRE regular expression library
39 for store allocation via Exim's store manager. The normal calls are actually
40 macros that pass over location information to make tracing easier. These
41 functions just interface to the standard macro calls. A good compiler will
42 optimize out the tail recursion and so not make them too expensive. There
43 are two sets of functions; one for use when we want to retain the compiled
44 regular expression for a long time; the other for short-term use. */
45
46 static void *
47 function_store_get(size_t size)
48 {
49 /* For now, regard all RE results as potentially tainted. We might need
50 more intelligence on this point. */
51 return store_get((int)size, TRUE);
52 }
53
54 static void
55 function_dummy_free(void *block) { block = block; }
56
57 static void *
58 function_store_malloc(size_t size)
59 {
60 return store_malloc((int)size);
61 }
62
63 static void
64 function_store_free(void *block)
65 {
66 store_free(block);
67 }
68
69
70
71
72 /*************************************************
73 * Enums for cmdline interface *
74 *************************************************/
75
76 enum commandline_info { CMDINFO_NONE=0,
77 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
78
79
80
81
82 /*************************************************
83 * Compile regular expression and panic on fail *
84 *************************************************/
85
86 /* This function is called when failure to compile a regular expression leads
87 to a panic exit. In other cases, pcre_compile() is called directly. In many
88 cases where this function is used, the results of the compilation are to be
89 placed in long-lived store, so we temporarily reset the store management
90 functions that PCRE uses if the use_malloc flag is set.
91
92 Argument:
93 pattern the pattern to compile
94 caseless TRUE if caseless matching is required
95 use_malloc TRUE if compile into malloc store
96
97 Returns: pointer to the compiled pattern
98 */
99
100 const pcre *
101 regex_must_compile(const uschar *pattern, BOOL caseless, BOOL use_malloc)
102 {
103 int offset;
104 int options = PCRE_COPT;
105 const pcre *yield;
106 const uschar *error;
107 if (use_malloc)
108 {
109 pcre_malloc = function_store_malloc;
110 pcre_free = function_store_free;
111 }
112 if (caseless) options |= PCRE_CASELESS;
113 yield = pcre_compile(CCS pattern, options, CCSS &error, &offset, NULL);
114 pcre_malloc = function_store_get;
115 pcre_free = function_dummy_free;
116 if (yield == NULL)
117 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
118 "%s at offset %d while compiling %s", error, offset, pattern);
119 return yield;
120 }
121
122
123
124
125 /*************************************************
126 * Execute regular expression and set strings *
127 *************************************************/
128
129 /* This function runs a regular expression match, and sets up the pointers to
130 the matched substrings.
131
132 Arguments:
133 re the compiled expression
134 subject the subject string
135 options additional PCRE options
136 setup if < 0 do full setup
137 if >= 0 setup from setup+1 onwards,
138 excluding the full matched string
139
140 Returns: TRUE or FALSE
141 */
142
143 BOOL
144 regex_match_and_setup(const pcre *re, const uschar *subject, int options, int setup)
145 {
146 int ovector[3*(EXPAND_MAXN+1)];
147 uschar * s = string_copy(subject); /* de-constifying */
148 int n = pcre_exec(re, NULL, CS s, Ustrlen(s), 0,
149 PCRE_EOPT | options, ovector, nelem(ovector));
150 BOOL yield = n >= 0;
151 if (n == 0) n = EXPAND_MAXN + 1;
152 if (yield)
153 {
154 expand_nmax = setup < 0 ? 0 : setup + 1;
155 for (int nn = setup < 0 ? 0 : 2; nn < n*2; nn += 2)
156 {
157 expand_nstring[expand_nmax] = s + ovector[nn];
158 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
159 }
160 expand_nmax--;
161 }
162 return yield;
163 }
164
165
166
167
168 /*************************************************
169 * Set up processing details *
170 *************************************************/
171
172 /* Save a text string for dumping when SIGUSR1 is received.
173 Do checks for overruns.
174
175 Arguments: format and arguments, as for printf()
176 Returns: nothing
177 */
178
179 void
180 set_process_info(const char *format, ...)
181 {
182 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
183 gstring * g;
184 int len;
185 va_list ap;
186
187 g = string_fmt_append(&gs, "%5d ", (int)getpid());
188 len = g->ptr;
189 va_start(ap, format);
190 if (!string_vformat(g, 0, format, ap))
191 {
192 gs.ptr = len;
193 g = string_cat(&gs, US"**** string overflowed buffer ****");
194 }
195 g = string_catn(g, US"\n", 1);
196 string_from_gstring(g);
197 process_info_len = g->ptr;
198 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
199 va_end(ap);
200 }
201
202 /***********************************************
203 * Handler for SIGTERM *
204 ***********************************************/
205
206 static void
207 term_handler(int sig)
208 {
209 exit(1);
210 }
211
212
213 /*************************************************
214 * Handler for SIGUSR1 *
215 *************************************************/
216
217 /* SIGUSR1 causes any exim process to write to the process log details of
218 what it is currently doing. It will only be used if the OS is capable of
219 setting up a handler that causes automatic restarting of any system call
220 that is in progress at the time.
221
222 This function takes care to be signal-safe.
223
224 Argument: the signal number (SIGUSR1)
225 Returns: nothing
226 */
227
228 static void
229 usr1_handler(int sig)
230 {
231 int fd;
232
233 os_restarting_signal(sig, usr1_handler);
234
235 if ((fd = Uopen(process_log_path, O_APPEND|O_WRONLY, LOG_MODE)) < 0)
236 {
237 /* If we are already running as the Exim user, try to create it in the
238 current process (assuming spool_directory exists). Otherwise, if we are
239 root, do the creation in an exim:exim subprocess. */
240
241 int euid = geteuid();
242 if (euid == exim_uid)
243 fd = Uopen(process_log_path, O_CREAT|O_APPEND|O_WRONLY, LOG_MODE);
244 else if (euid == root_uid)
245 fd = log_create_as_exim(process_log_path);
246 }
247
248 /* If we are neither exim nor root, or if we failed to create the log file,
249 give up. There is not much useful we can do with errors, since we don't want
250 to disrupt whatever is going on outside the signal handler. */
251
252 if (fd < 0) return;
253
254 (void)write(fd, process_info, process_info_len);
255 (void)close(fd);
256 }
257
258
259
260 /*************************************************
261 * Timeout handler *
262 *************************************************/
263
264 /* This handler is enabled most of the time that Exim is running. The handler
265 doesn't actually get used unless alarm() has been called to set a timer, to
266 place a time limit on a system call of some kind. When the handler is run, it
267 re-enables itself.
268
269 There are some other SIGALRM handlers that are used in special cases when more
270 than just a flag setting is required; for example, when reading a message's
271 input. These are normally set up in the code module that uses them, and the
272 SIGALRM handler is reset to this one afterwards.
273
274 Argument: the signal value (SIGALRM)
275 Returns: nothing
276 */
277
278 void
279 sigalrm_handler(int sig)
280 {
281 sig = sig; /* Keep picky compilers happy */
282 sigalrm_seen = TRUE;
283 os_non_restarting_signal(SIGALRM, sigalrm_handler);
284 }
285
286
287
288 /*************************************************
289 * Sleep for a fractional time interval *
290 *************************************************/
291
292 /* This function is called by millisleep() and exim_wait_tick() to wait for a
293 period of time that may include a fraction of a second. The coding is somewhat
294 tedious. We do not expect setitimer() ever to fail, but if it does, the process
295 will wait for ever, so we panic in this instance. (There was a case of this
296 when a bug in a function that calls milliwait() caused it to pass invalid data.
297 That's when I added the check. :-)
298
299 We assume it to be not worth sleeping for under 50us; this value will
300 require revisiting as hardware advances. This avoids the issue of
301 a zero-valued timer setting meaning "never fire".
302
303 Argument: an itimerval structure containing the interval
304 Returns: nothing
305 */
306
307 static void
308 milliwait(struct itimerval *itval)
309 {
310 sigset_t sigmask;
311 sigset_t old_sigmask;
312 int save_errno = errno;
313
314 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
315 return;
316 (void)sigemptyset(&sigmask); /* Empty mask */
317 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
318 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
319 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
320 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
321 "setitimer() failed: %s", strerror(errno));
322 (void)sigfillset(&sigmask); /* All signals */
323 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
324 (void)sigsuspend(&sigmask); /* Until SIGALRM */
325 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
326 errno = save_errno;
327 sigalrm_seen = FALSE;
328 }
329
330
331
332
333 /*************************************************
334 * Millisecond sleep function *
335 *************************************************/
336
337 /* The basic sleep() function has a granularity of 1 second, which is too rough
338 in some cases - for example, when using an increasing delay to slow down
339 spammers.
340
341 Argument: number of millseconds
342 Returns: nothing
343 */
344
345 void
346 millisleep(int msec)
347 {
348 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
349 .it_value = {.tv_sec = msec/1000,
350 .tv_usec = (msec % 1000) * 1000}};
351 milliwait(&itval);
352 }
353
354
355
356 /*************************************************
357 * Compare microsecond times *
358 *************************************************/
359
360 /*
361 Arguments:
362 tv1 the first time
363 tv2 the second time
364
365 Returns: -1, 0, or +1
366 */
367
368 static int
369 exim_tvcmp(struct timeval *t1, struct timeval *t2)
370 {
371 if (t1->tv_sec > t2->tv_sec) return +1;
372 if (t1->tv_sec < t2->tv_sec) return -1;
373 if (t1->tv_usec > t2->tv_usec) return +1;
374 if (t1->tv_usec < t2->tv_usec) return -1;
375 return 0;
376 }
377
378
379
380
381 /*************************************************
382 * Clock tick wait function *
383 *************************************************/
384
385 #ifdef _POSIX_MONOTONIC_CLOCK
386 /* Amount CLOCK_MONOTONIC is behind realtime, at startup. */
387 static struct timespec offset_ts;
388
389 static void
390 exim_clock_init(void)
391 {
392 struct timeval tv;
393 if (clock_gettime(CLOCK_MONOTONIC, &offset_ts) != 0) return;
394 (void)gettimeofday(&tv, NULL);
395 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
396 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
397 if (offset_ts.tv_nsec >= 0) return;
398 offset_ts.tv_sec--;
399 offset_ts.tv_nsec += 1000*1000*1000;
400 }
401 #endif
402
403
404 /* Exim uses a time + a pid to generate a unique identifier in two places: its
405 message IDs, and in file names for maildir deliveries. Because some OS now
406 re-use pids within the same second, sub-second times are now being used.
407 However, for absolute certainty, we must ensure the clock has ticked before
408 allowing the relevant process to complete. At the time of implementation of
409 this code (February 2003), the speed of processors is such that the clock will
410 invariably have ticked already by the time a process has done its job. This
411 function prepares for the time when things are faster - and it also copes with
412 clocks that go backwards.
413
414 Arguments:
415 tgt_tv A timeval which was used to create uniqueness; its usec field
416 has been rounded down to the value of the resolution.
417 We want to be sure the current time is greater than this.
418 resolution The resolution that was used to divide the microseconds
419 (1 for maildir, larger for message ids)
420
421 Returns: nothing
422 */
423
424 void
425 exim_wait_tick(struct timeval * tgt_tv, int resolution)
426 {
427 struct timeval now_tv;
428 long int now_true_usec;
429
430 #ifdef _POSIX_MONOTONIC_CLOCK
431 struct timespec now_ts;
432
433 if (clock_gettime(CLOCK_MONOTONIC, &now_ts) == 0)
434 {
435 now_ts.tv_sec += offset_ts.tv_sec;
436 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
437 {
438 now_ts.tv_sec++;
439 now_ts.tv_nsec -= 1000*1000*1000;
440 }
441 now_tv.tv_sec = now_ts.tv_sec;
442 now_true_usec = (now_ts.tv_nsec / (resolution * 1000)) * resolution;
443 now_tv.tv_usec = now_true_usec;
444 }
445 else
446 #endif
447 {
448 (void)gettimeofday(&now_tv, NULL);
449 now_true_usec = now_tv.tv_usec;
450 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
451 }
452
453 while (exim_tvcmp(&now_tv, tgt_tv) <= 0)
454 {
455 struct itimerval itval;
456 itval.it_interval.tv_sec = 0;
457 itval.it_interval.tv_usec = 0;
458 itval.it_value.tv_sec = tgt_tv->tv_sec - now_tv.tv_sec;
459 itval.it_value.tv_usec = tgt_tv->tv_usec + resolution - now_true_usec;
460
461 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
462 negative value for the microseconds is possible only in the case when "now"
463 is more than a second less than "tgt". That means that itval.it_value.tv_sec
464 is greater than zero. The following correction is therefore safe. */
465
466 if (itval.it_value.tv_usec < 0)
467 {
468 itval.it_value.tv_usec += 1000000;
469 itval.it_value.tv_sec -= 1;
470 }
471
472 DEBUG(D_transport|D_receive)
473 {
474 if (!f.running_in_test_harness)
475 {
476 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
477 tgt_tv->tv_sec, (long) tgt_tv->tv_usec,
478 now_tv.tv_sec, (long) now_tv.tv_usec);
479 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
480 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
481 }
482 }
483
484 milliwait(&itval);
485
486 /* Be prapared to go around if the kernel does not implement subtick
487 granularity (GNU Hurd) */
488
489 (void)gettimeofday(&now_tv, NULL);
490 now_true_usec = now_tv.tv_usec;
491 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
492 }
493 }
494
495
496
497
498 /*************************************************
499 * Call fopen() with umask 777 and adjust mode *
500 *************************************************/
501
502 /* Exim runs with umask(0) so that files created with open() have the mode that
503 is specified in the open() call. However, there are some files, typically in
504 the spool directory, that are created with fopen(). They end up world-writeable
505 if no precautions are taken. Although the spool directory is not accessible to
506 the world, this is an untidiness. So this is a wrapper function for fopen()
507 that sorts out the mode of the created file.
508
509 Arguments:
510 filename the file name
511 options the fopen() options
512 mode the required mode
513
514 Returns: the fopened FILE or NULL
515 */
516
517 FILE *
518 modefopen(const uschar *filename, const char *options, mode_t mode)
519 {
520 mode_t saved_umask = umask(0777);
521 FILE *f = Ufopen(filename, options);
522 (void)umask(saved_umask);
523 if (f != NULL) (void)fchmod(fileno(f), mode);
524 return f;
525 }
526
527
528 /*************************************************
529 * Ensure stdin, stdout, and stderr exist *
530 *************************************************/
531
532 /* Some operating systems grumble if an exec() happens without a standard
533 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
534 file will be opened and will use these fd values, and then some other bit of
535 code will assume, for example, that it can write error messages to stderr.
536 This function ensures that fds 0, 1, and 2 are open if they do not already
537 exist, by connecting them to /dev/null.
538
539 This function is also used to ensure that std{in,out,err} exist at all times,
540 so that if any library that Exim calls tries to use them, it doesn't crash.
541
542 Arguments: None
543 Returns: Nothing
544 */
545
546 void
547 exim_nullstd(void)
548 {
549 int devnull = -1;
550 struct stat statbuf;
551 for (int i = 0; i <= 2; i++)
552 {
553 if (fstat(i, &statbuf) < 0 && errno == EBADF)
554 {
555 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
556 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
557 string_open_failed(errno, "/dev/null", NULL));
558 if (devnull != i) (void)dup2(devnull, i);
559 }
560 }
561 if (devnull > 2) (void)close(devnull);
562 }
563
564
565
566
567 /*************************************************
568 * Close unwanted file descriptors for delivery *
569 *************************************************/
570
571 /* This function is called from a new process that has been forked to deliver
572 an incoming message, either directly, or using exec.
573
574 We want any smtp input streams to be closed in this new process. However, it
575 has been observed that using fclose() here causes trouble. When reading in -bS
576 input, duplicate copies of messages have been seen. The files will be sharing a
577 file pointer with the parent process, and it seems that fclose() (at least on
578 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
579 least sometimes. Hence we go for closing the underlying file descriptors.
580
581 If TLS is active, we want to shut down the TLS library, but without molesting
582 the parent's SSL connection.
583
584 For delivery of a non-SMTP message, we want to close stdin and stdout (and
585 stderr unless debugging) because the calling process might have set them up as
586 pipes and be waiting for them to close before it waits for the submission
587 process to terminate. If they aren't closed, they hold up the calling process
588 until the initial delivery process finishes, which is not what we want.
589
590 Exception: We do want it for synchronous delivery!
591
592 And notwithstanding all the above, if D_resolver is set, implying resolver
593 debugging, leave stdout open, because that's where the resolver writes its
594 debugging output.
595
596 When we close stderr (which implies we've also closed stdout), we also get rid
597 of any controlling terminal.
598
599 Arguments: None
600 Returns: Nothing
601 */
602
603 static void
604 close_unwanted(void)
605 {
606 if (smtp_input)
607 {
608 #ifndef DISABLE_TLS
609 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
610 #endif
611 (void)close(fileno(smtp_in));
612 (void)close(fileno(smtp_out));
613 smtp_in = NULL;
614 }
615 else
616 {
617 (void)close(0); /* stdin */
618 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
619 if (debug_selector == 0) /* stderr */
620 {
621 if (!f.synchronous_delivery)
622 {
623 (void)close(2);
624 log_stderr = NULL;
625 }
626 (void)setsid();
627 }
628 }
629 }
630
631
632
633
634 /*************************************************
635 * Set uid and gid *
636 *************************************************/
637
638 /* This function sets a new uid and gid permanently, optionally calling
639 initgroups() to set auxiliary groups. There are some special cases when running
640 Exim in unprivileged modes. In these situations the effective uid will not be
641 root; if we already have the right effective uid/gid, and don't need to
642 initialize any groups, leave things as they are.
643
644 Arguments:
645 uid the uid
646 gid the gid
647 igflag TRUE if initgroups() wanted
648 msg text to use in debugging output and failure log
649
650 Returns: nothing; bombs out on failure
651 */
652
653 void
654 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
655 {
656 uid_t euid = geteuid();
657 gid_t egid = getegid();
658
659 if (euid == root_uid || euid != uid || egid != gid || igflag)
660 {
661 /* At least one OS returns +1 for initgroups failure, so just check for
662 non-zero. */
663
664 if (igflag)
665 {
666 struct passwd *pw = getpwuid(uid);
667 if (!pw)
668 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
669 "no passwd entry for uid=%ld", (long int)uid);
670
671 if (initgroups(pw->pw_name, gid) != 0)
672 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
673 (long int)uid, strerror(errno));
674 }
675
676 if (setgid(gid) < 0 || setuid(uid) < 0)
677 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
678 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
679 }
680
681 /* Debugging output included uid/gid and all groups */
682
683 DEBUG(D_uid)
684 {
685 int group_count, save_errno;
686 gid_t group_list[EXIM_GROUPLIST_SIZE];
687 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
688 (long int)geteuid(), (long int)getegid(), (long int)getpid());
689 group_count = getgroups(nelem(group_list), group_list);
690 save_errno = errno;
691 debug_printf(" auxiliary group list:");
692 if (group_count > 0)
693 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
694 else if (group_count < 0)
695 debug_printf(" <error: %s>", strerror(save_errno));
696 else debug_printf(" <none>");
697 debug_printf("\n");
698 }
699 }
700
701
702
703
704 /*************************************************
705 * Exit point *
706 *************************************************/
707
708 /* Exim exits via this function so that it always clears up any open
709 databases.
710
711 Arguments:
712 rc return code
713
714 Returns: does not return
715 */
716
717 void
718 exim_exit(int rc)
719 {
720 search_tidyup();
721 store_exit();
722 DEBUG(D_any)
723 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
724 ">>>>>>>>>>>>>>>>\n",
725 (int)getpid(), process_purpose, rc);
726 exit(rc);
727 }
728
729
730 void
731 exim_underbar_exit(int rc)
732 {
733 store_exit();
734 DEBUG(D_any)
735 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
736 ">>>>>>>>>>>>>>>>\n",
737 (int)getpid(), process_purpose, rc);
738 _exit(rc);
739 }
740
741
742
743 /* Print error string, then die */
744 static void
745 exim_fail(const char * fmt, ...)
746 {
747 va_list ap;
748 va_start(ap, fmt);
749 vfprintf(stderr, fmt, ap);
750 exit(EXIT_FAILURE);
751 }
752
753 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
754 of chown()/fchown(). See src/functions.h for more explanation */
755 int
756 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
757 {
758 int saved_errno = errno; /* from the preceeding chown call */
759 #if 1
760 log_write(0, LOG_MAIN|LOG_PANIC,
761 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
762 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
763 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
764 #else
765 /* I leave this here, commented, in case the "bug"(?) comes up again.
766 It is not an Exim bug, but we can provide a workaround.
767 See Bug 2391
768 HS 2019-04-18 */
769
770 struct stat buf;
771
772 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
773 {
774 if (buf.st_uid == owner && buf.st_gid == group) return 0;
775 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
776 }
777 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
778
779 #endif
780 errno = saved_errno;
781 return -1;
782 }
783
784
785 /*************************************************
786 * Extract port from host address *
787 *************************************************/
788
789 /* Called to extract the port from the values given to -oMa and -oMi.
790 It also checks the syntax of the address, and terminates it before the
791 port data when a port is extracted.
792
793 Argument:
794 address the address, with possible port on the end
795
796 Returns: the port, or zero if there isn't one
797 bombs out on a syntax error
798 */
799
800 static int
801 check_port(uschar *address)
802 {
803 int port = host_address_extract_port(address);
804 if (string_is_ip_address(address, NULL) == 0)
805 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
806 return port;
807 }
808
809
810
811 /*************************************************
812 * Test/verify an address *
813 *************************************************/
814
815 /* This function is called by the -bv and -bt code. It extracts a working
816 address from a full RFC 822 address. This isn't really necessary per se, but it
817 has the effect of collapsing source routes.
818
819 Arguments:
820 s the address string
821 flags flag bits for verify_address()
822 exit_value to be set for failures
823
824 Returns: nothing
825 */
826
827 static void
828 test_address(uschar *s, int flags, int *exit_value)
829 {
830 int start, end, domain;
831 uschar *parse_error = NULL;
832 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
833 FALSE);
834 if (!address)
835 {
836 fprintf(stdout, "syntax error: %s\n", parse_error);
837 *exit_value = 2;
838 }
839 else
840 {
841 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
842 -1, -1, NULL, NULL, NULL);
843 if (rc == FAIL) *exit_value = 2;
844 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
845 }
846 }
847
848
849
850 /*************************************************
851 * Show supported features *
852 *************************************************/
853
854 static void
855 show_db_version(FILE * f)
856 {
857 #ifdef DB_VERSION_STRING
858 DEBUG(D_any)
859 {
860 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
861 fprintf(f, " Runtime: %s\n",
862 db_version(NULL, NULL, NULL));
863 }
864 else
865 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
866
867 #elif defined(BTREEVERSION) && defined(HASHVERSION)
868 #ifdef USE_DB
869 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
870 #else
871 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
872 #endif
873
874 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
875 fprintf(f, "Probably ndbm\n");
876 #elif defined(USE_TDB)
877 fprintf(f, "Using tdb\n");
878 #else
879 #ifdef USE_GDBM
880 fprintf(f, "Probably GDBM (native mode)\n");
881 #else
882 fprintf(f, "Probably GDBM (compatibility mode)\n");
883 #endif
884 #endif
885 }
886
887
888 /* This function is called for -bV/--version and for -d to output the optional
889 features of the current Exim binary.
890
891 Arguments: a FILE for printing
892 Returns: nothing
893 */
894
895 static void
896 show_whats_supported(FILE * fp)
897 {
898 rmark reset_point = store_mark();
899 gstring * g;
900 DEBUG(D_any) {} else show_db_version(fp);
901
902 g = string_cat(NULL, US"Support for:");
903 #ifdef SUPPORT_CRYPTEQ
904 g = string_cat(g, US" crypteq");
905 #endif
906 #if HAVE_ICONV
907 g = string_cat(g, US" iconv()");
908 #endif
909 #if HAVE_IPV6
910 g = string_cat(g, US" IPv6");
911 #endif
912 #ifdef HAVE_SETCLASSRESOURCES
913 g = string_cat(g, US" use_setclassresources");
914 #endif
915 #ifdef SUPPORT_PAM
916 g = string_cat(g, US" PAM");
917 #endif
918 #ifdef EXIM_PERL
919 g = string_cat(g, US" Perl");
920 #endif
921 #ifdef EXPAND_DLFUNC
922 g = string_cat(g, US" Expand_dlfunc");
923 #endif
924 #ifdef USE_TCP_WRAPPERS
925 g = string_cat(g, US" TCPwrappers");
926 #endif
927 #ifdef USE_GNUTLS
928 g = string_cat(g, US" GnuTLS");
929 #endif
930 #ifdef USE_OPENSSL
931 g = string_cat(g, US" OpenSSL");
932 #endif
933 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
934 g = string_cat(g, US" translate_ip_address");
935 #endif
936 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
937 g = string_cat(g, US" move_frozen_messages");
938 #endif
939 #ifdef WITH_CONTENT_SCAN
940 g = string_cat(g, US" Content_Scanning");
941 #endif
942 #ifdef SUPPORT_DANE
943 g = string_cat(g, US" DANE");
944 #endif
945 #ifndef DISABLE_DKIM
946 g = string_cat(g, US" DKIM");
947 #endif
948 #ifndef DISABLE_DNSSEC
949 g = string_cat(g, US" DNSSEC");
950 #endif
951 #ifndef DISABLE_EVENT
952 g = string_cat(g, US" Event");
953 #endif
954 #ifdef SUPPORT_I18N
955 g = string_cat(g, US" I18N");
956 #endif
957 #ifndef DISABLE_OCSP
958 g = string_cat(g, US" OCSP");
959 #endif
960 #ifndef DISABLE_PIPE_CONNECT
961 g = string_cat(g, US" PIPE_CONNECT");
962 #endif
963 #ifndef DISABLE_PRDR
964 g = string_cat(g, US" PRDR");
965 #endif
966 #ifdef SUPPORT_PROXY
967 g = string_cat(g, US" PROXY");
968 #endif
969 #ifdef SUPPORT_SOCKS
970 g = string_cat(g, US" SOCKS");
971 #endif
972 #ifdef SUPPORT_SPF
973 g = string_cat(g, US" SPF");
974 #endif
975 #ifdef SUPPORT_DMARC
976 g = string_cat(g, US" DMARC");
977 #endif
978 #ifdef TCP_FASTOPEN
979 tcp_init();
980 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
981 #endif
982 #ifdef EXPERIMENTAL_ARC
983 g = string_cat(g, US" Experimental_ARC");
984 #endif
985 #ifdef EXPERIMENTAL_BRIGHTMAIL
986 g = string_cat(g, US" Experimental_Brightmail");
987 #endif
988 #ifdef EXPERIMENTAL_DCC
989 g = string_cat(g, US" Experimental_DCC");
990 #endif
991 #ifdef EXPERIMENTAL_DSN_INFO
992 g = string_cat(g, US" Experimental_DSN_info");
993 #endif
994 #ifdef EXPERIMENTAL_LMDB
995 g = string_cat(g, US" Experimental_LMDB");
996 #endif
997 #ifdef EXPERIMENTAL_QUEUE_RAMP
998 g = string_cat(g, US" Experimental_Queue_Ramp");
999 #endif
1000 #ifdef EXPERIMENTAL_QUEUEFILE
1001 g = string_cat(g, US" Experimental_QUEUEFILE");
1002 #endif
1003 #if defined(EXPERIMENTAL_SRS) || defined(EXPERIMENTAL_SRS_NATIVE)
1004 g = string_cat(g, US" Experimental_SRS");
1005 #endif
1006 #ifdef EXPERIMENTAL_TLS_RESUME
1007 g = string_cat(g, US" Experimental_TLS_resume");
1008 #endif
1009 g = string_cat(g, US"\n");
1010
1011 g = string_cat(g, US"Lookups (built-in):");
1012 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1013 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1014 #endif
1015 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1016 g = string_cat(g, US" cdb");
1017 #endif
1018 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1019 g = string_cat(g, US" dbm dbmjz dbmnz");
1020 #endif
1021 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1022 g = string_cat(g, US" dnsdb");
1023 #endif
1024 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1025 g = string_cat(g, US" dsearch");
1026 #endif
1027 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1028 g = string_cat(g, US" ibase");
1029 #endif
1030 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1031 g = string_cat(g, US" json");
1032 #endif
1033 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1034 g = string_cat(g, US" ldap ldapdn ldapm");
1035 #endif
1036 #ifdef EXPERIMENTAL_LMDB
1037 g = string_cat(g, US" lmdb");
1038 #endif
1039 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1040 g = string_cat(g, US" mysql");
1041 #endif
1042 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1043 g = string_cat(g, US" nis nis0");
1044 #endif
1045 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1046 g = string_cat(g, US" nisplus");
1047 #endif
1048 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1049 g = string_cat(g, US" oracle");
1050 #endif
1051 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1052 g = string_cat(g, US" passwd");
1053 #endif
1054 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1055 g = string_cat(g, US" pgsql");
1056 #endif
1057 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1058 g = string_cat(g, US" redis");
1059 #endif
1060 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1061 g = string_cat(g, US" sqlite");
1062 #endif
1063 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1064 g = string_cat(g, US" testdb");
1065 #endif
1066 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1067 g = string_cat(g, US" whoson");
1068 #endif
1069 g = string_cat(g, US"\n");
1070
1071 g = auth_show_supported(g);
1072 g = route_show_supported(g);
1073 g = transport_show_supported(g);
1074
1075 #ifdef WITH_CONTENT_SCAN
1076 g = malware_show_supported(g);
1077 #endif
1078
1079 if (fixed_never_users[0] > 0)
1080 {
1081 int i;
1082 g = string_cat(g, US"Fixed never_users: ");
1083 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1084 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1085 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1086 }
1087
1088 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1089 fputs(CS string_from_gstring(g), fp);
1090
1091 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1092
1093 /* Everything else is details which are only worth reporting when debugging.
1094 Perhaps the tls_version_report should move into this too. */
1095 DEBUG(D_any) do {
1096
1097 /* clang defines __GNUC__ (at least, for me) so test for it first */
1098 #if defined(__clang__)
1099 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1100 #elif defined(__GNUC__)
1101 fprintf(fp, "Compiler: GCC [%s]\n",
1102 # ifdef __VERSION__
1103 __VERSION__
1104 # else
1105 "? unknown version ?"
1106 # endif
1107 );
1108 #else
1109 fprintf(fp, "Compiler: <unknown>\n");
1110 #endif
1111
1112 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1113 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1114 __GLIBC__, __GLIBC_MINOR__);
1115 if (__GLIBC_PREREQ(2, 1))
1116 fprintf(fp, " Runtime: %s\n",
1117 gnu_get_libc_version());
1118 #endif
1119
1120 show_db_version(fp);
1121
1122 #ifndef DISABLE_TLS
1123 tls_version_report(fp);
1124 #endif
1125 #ifdef SUPPORT_I18N
1126 utf8_version_report(fp);
1127 #endif
1128 #ifdef SUPPORT_SPF
1129 spf_lib_version_report(fp);
1130 #endif
1131
1132 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1133 if (authi->version_report)
1134 (*authi->version_report)(fp);
1135
1136 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1137 characters; unless it's an ancient version of PCRE in which case it
1138 is not defined. */
1139 #ifndef PCRE_PRERELEASE
1140 # define PCRE_PRERELEASE
1141 #endif
1142 #define QUOTE(X) #X
1143 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1144 fprintf(fp, "Library version: PCRE: Compile: %d.%d%s\n"
1145 " Runtime: %s\n",
1146 PCRE_MAJOR, PCRE_MINOR,
1147 EXPAND_AND_QUOTE(PCRE_PRERELEASE) "",
1148 pcre_version());
1149 #undef QUOTE
1150 #undef EXPAND_AND_QUOTE
1151
1152 init_lookup_list();
1153 for (int i = 0; i < lookup_list_count; i++)
1154 if (lookup_list[i]->version_report)
1155 lookup_list[i]->version_report(fp);
1156
1157 #ifdef WHITELIST_D_MACROS
1158 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1159 #else
1160 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1161 #endif
1162 #ifdef TRUSTED_CONFIG_LIST
1163 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1164 #else
1165 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1166 #endif
1167
1168 } while (0);
1169 store_reset(reset_point);
1170 }
1171
1172
1173 /*************************************************
1174 * Show auxiliary information about Exim *
1175 *************************************************/
1176
1177 static void
1178 show_exim_information(enum commandline_info request, FILE *stream)
1179 {
1180 switch(request)
1181 {
1182 case CMDINFO_NONE:
1183 fprintf(stream, "Oops, something went wrong.\n");
1184 return;
1185 case CMDINFO_HELP:
1186 fprintf(stream,
1187 "The -bI: flag takes a string indicating which information to provide.\n"
1188 "If the string is not recognised, you'll get this help (on stderr).\n"
1189 "\n"
1190 " exim -bI:help this information\n"
1191 " exim -bI:dscp list of known dscp value keywords\n"
1192 " exim -bI:sieve list of supported sieve extensions\n"
1193 );
1194 return;
1195 case CMDINFO_SIEVE:
1196 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1197 fprintf(stream, "%s\n", *pp);
1198 return;
1199 case CMDINFO_DSCP:
1200 dscp_list_to_stream(stream);
1201 return;
1202 }
1203 }
1204
1205
1206 /*************************************************
1207 * Quote a local part *
1208 *************************************************/
1209
1210 /* This function is used when a sender address or a From: or Sender: header
1211 line is being created from the caller's login, or from an authenticated_id. It
1212 applies appropriate quoting rules for a local part.
1213
1214 Argument: the local part
1215 Returns: the local part, quoted if necessary
1216 */
1217
1218 uschar *
1219 local_part_quote(uschar *lpart)
1220 {
1221 BOOL needs_quote = FALSE;
1222 gstring * g;
1223
1224 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1225 {
1226 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1227 (*t != '.' || t == lpart || t[1] == 0);
1228 }
1229
1230 if (!needs_quote) return lpart;
1231
1232 g = string_catn(NULL, US"\"", 1);
1233
1234 for (;;)
1235 {
1236 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1237 if (nq == NULL)
1238 {
1239 g = string_cat(g, lpart);
1240 break;
1241 }
1242 g = string_catn(g, lpart, nq - lpart);
1243 g = string_catn(g, US"\\", 1);
1244 g = string_catn(g, nq, 1);
1245 lpart = nq + 1;
1246 }
1247
1248 g = string_catn(g, US"\"", 1);
1249 return string_from_gstring(g);
1250 }
1251
1252
1253
1254 #ifdef USE_READLINE
1255 /*************************************************
1256 * Load readline() functions *
1257 *************************************************/
1258
1259 /* This function is called from testing executions that read data from stdin,
1260 but only when running as the calling user. Currently, only -be does this. The
1261 function loads the readline() function library and passes back the functions.
1262 On some systems, it needs the curses library, so load that too, but try without
1263 it if loading fails. All this functionality has to be requested at build time.
1264
1265 Arguments:
1266 fn_readline_ptr pointer to where to put the readline pointer
1267 fn_addhist_ptr pointer to where to put the addhistory function
1268
1269 Returns: the dlopen handle or NULL on failure
1270 */
1271
1272 static void *
1273 set_readline(char * (**fn_readline_ptr)(const char *),
1274 void (**fn_addhist_ptr)(const char *))
1275 {
1276 void *dlhandle;
1277 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1278
1279 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1280 if (dlhandle_curses) dlclose(dlhandle_curses);
1281
1282 if (dlhandle)
1283 {
1284 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1285 * char * readline (const char *prompt);
1286 * void add_history (const char *string);
1287 */
1288 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1289 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1290 }
1291 else
1292 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1293
1294 return dlhandle;
1295 }
1296 #endif
1297
1298
1299
1300 /*************************************************
1301 * Get a line from stdin for testing things *
1302 *************************************************/
1303
1304 /* This function is called when running tests that can take a number of lines
1305 of input (for example, -be and -bt). It handles continuations and trailing
1306 spaces. And prompting and a blank line output on eof. If readline() is in use,
1307 the arguments are non-NULL and provide the relevant functions.
1308
1309 Arguments:
1310 fn_readline readline function or NULL
1311 fn_addhist addhist function or NULL
1312
1313 Returns: pointer to dynamic memory, or NULL at end of file
1314 */
1315
1316 static uschar *
1317 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1318 {
1319 gstring * g = NULL;
1320
1321 if (!fn_readline) { printf("> "); fflush(stdout); }
1322
1323 for (int i = 0;; i++)
1324 {
1325 uschar buffer[1024];
1326 uschar *p, *ss;
1327
1328 #ifdef USE_READLINE
1329 char *readline_line = NULL;
1330 if (fn_readline)
1331 {
1332 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1333 if (*readline_line != 0 && fn_addhist) fn_addhist(readline_line);
1334 p = US readline_line;
1335 }
1336 else
1337 #endif
1338
1339 /* readline() not in use */
1340
1341 {
1342 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1343 p = buffer;
1344 }
1345
1346 /* Handle the line */
1347
1348 ss = p + (int)Ustrlen(p);
1349 while (ss > p && isspace(ss[-1])) ss--;
1350
1351 if (i > 0)
1352 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1353
1354 g = string_catn(g, p, ss - p);
1355
1356 #ifdef USE_READLINE
1357 if (fn_readline) free(readline_line);
1358 #endif
1359
1360 /* g can only be NULL if ss==p */
1361 if (ss == p || g->s[g->ptr-1] != '\\')
1362 break;
1363
1364 --g->ptr;
1365 (void) string_from_gstring(g);
1366 }
1367
1368 if (!g) printf("\n");
1369 return string_from_gstring(g);
1370 }
1371
1372
1373
1374 /*************************************************
1375 * Output usage information for the program *
1376 *************************************************/
1377
1378 /* This function is called when there are no recipients
1379 or a specific --help argument was added.
1380
1381 Arguments:
1382 progname information on what name we were called by
1383
1384 Returns: DOES NOT RETURN
1385 */
1386
1387 static void
1388 exim_usage(uschar *progname)
1389 {
1390
1391 /* Handle specific program invocation variants */
1392 if (Ustrcmp(progname, US"-mailq") == 0)
1393 exim_fail(
1394 "mailq - list the contents of the mail queue\n\n"
1395 "For a list of options, see the Exim documentation.\n");
1396
1397 /* Generic usage - we output this whatever happens */
1398 exim_fail(
1399 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1400 "not directly from a shell command line. Options and/or arguments control\n"
1401 "what it does when called. For a list of options, see the Exim documentation.\n");
1402 }
1403
1404
1405
1406 /*************************************************
1407 * Validate that the macros given are okay *
1408 *************************************************/
1409
1410 /* Typically, Exim will drop privileges if macros are supplied. In some
1411 cases, we want to not do so.
1412
1413 Arguments: opt_D_used - true if the commandline had a "-D" option
1414 Returns: true if trusted, false otherwise
1415 */
1416
1417 static BOOL
1418 macros_trusted(BOOL opt_D_used)
1419 {
1420 #ifdef WHITELIST_D_MACROS
1421 uschar *whitelisted, *end, *p, **whites;
1422 int white_count, i, n;
1423 size_t len;
1424 BOOL prev_char_item, found;
1425 #endif
1426
1427 if (!opt_D_used)
1428 return TRUE;
1429 #ifndef WHITELIST_D_MACROS
1430 return FALSE;
1431 #else
1432
1433 /* We only trust -D overrides for some invoking users:
1434 root, the exim run-time user, the optional config owner user.
1435 I don't know why config-owner would be needed, but since they can own the
1436 config files anyway, there's no security risk to letting them override -D. */
1437 if ( ! ((real_uid == root_uid)
1438 || (real_uid == exim_uid)
1439 #ifdef CONFIGURE_OWNER
1440 || (real_uid == config_uid)
1441 #endif
1442 ))
1443 {
1444 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1445 return FALSE;
1446 }
1447
1448 /* Get a list of macros which are whitelisted */
1449 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1450 prev_char_item = FALSE;
1451 white_count = 0;
1452 for (p = whitelisted; *p != '\0'; ++p)
1453 {
1454 if (*p == ':' || isspace(*p))
1455 {
1456 *p = '\0';
1457 if (prev_char_item)
1458 ++white_count;
1459 prev_char_item = FALSE;
1460 continue;
1461 }
1462 if (!prev_char_item)
1463 prev_char_item = TRUE;
1464 }
1465 end = p;
1466 if (prev_char_item)
1467 ++white_count;
1468 if (!white_count)
1469 return FALSE;
1470 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1471 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1472 {
1473 if (*p != '\0')
1474 {
1475 whites[i++] = p;
1476 if (i == white_count)
1477 break;
1478 while (*p != '\0' && p < end)
1479 ++p;
1480 }
1481 }
1482 whites[i] = NULL;
1483
1484 /* The list of commandline macros should be very short.
1485 Accept the N*M complexity. */
1486 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1487 {
1488 found = FALSE;
1489 for (uschar ** w = whites; *w; ++w)
1490 if (Ustrcmp(*w, m->name) == 0)
1491 {
1492 found = TRUE;
1493 break;
1494 }
1495 if (!found)
1496 return FALSE;
1497 if (!m->replacement)
1498 continue;
1499 if ((len = m->replen) == 0)
1500 continue;
1501 n = pcre_exec(regex_whitelisted_macro, NULL, CS m->replacement, len,
1502 0, PCRE_EOPT, NULL, 0);
1503 if (n < 0)
1504 {
1505 if (n != PCRE_ERROR_NOMATCH)
1506 debug_printf("macros_trusted checking %s returned %d\n", m->name, n);
1507 return FALSE;
1508 }
1509 }
1510 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1511 return TRUE;
1512 #endif
1513 }
1514
1515
1516 /*************************************************
1517 * Expansion testing *
1518 *************************************************/
1519
1520 /* Expand and print one item, doing macro-processing.
1521
1522 Arguments:
1523 item line for expansion
1524 */
1525
1526 static void
1527 expansion_test_line(uschar * line)
1528 {
1529 int len;
1530 BOOL dummy_macexp;
1531
1532 Ustrncpy(big_buffer, line, big_buffer_size);
1533 big_buffer[big_buffer_size-1] = '\0';
1534 len = Ustrlen(big_buffer);
1535
1536 (void) macros_expand(0, &len, &dummy_macexp);
1537
1538 if (isupper(big_buffer[0]))
1539 {
1540 if (macro_read_assignment(big_buffer))
1541 printf("Defined macro '%s'\n", mlast->name);
1542 }
1543 else
1544 if ((line = expand_string(big_buffer))) printf("%s\n", CS line);
1545 else printf("Failed: %s\n", expand_string_message);
1546 }
1547
1548
1549
1550 /*************************************************
1551 * Entry point and high-level code *
1552 *************************************************/
1553
1554 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1555 the appropriate action. All the necessary functions are present in the one
1556 binary. I originally thought one should split it up, but it turns out that so
1557 much of the apparatus is needed in each chunk that one might as well just have
1558 it all available all the time, which then makes the coding easier as well.
1559
1560 Arguments:
1561 argc count of entries in argv
1562 argv argument strings, with argv[0] being the program name
1563
1564 Returns: EXIT_SUCCESS if terminated successfully
1565 EXIT_FAILURE otherwise, except when a message has been sent
1566 to the sender, and -oee was given
1567 */
1568
1569 int
1570 main(int argc, char **cargv)
1571 {
1572 uschar **argv = USS cargv;
1573 int arg_receive_timeout = -1;
1574 int arg_smtp_receive_timeout = -1;
1575 int arg_error_handling = error_handling;
1576 int filter_sfd = -1;
1577 int filter_ufd = -1;
1578 int group_count;
1579 int i, rv;
1580 int list_queue_option = 0;
1581 int msg_action = 0;
1582 int msg_action_arg = -1;
1583 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1584 int queue_only_reason = 0;
1585 #ifdef EXIM_PERL
1586 int perl_start_option = 0;
1587 #endif
1588 int recipients_arg = argc;
1589 int sender_address_domain = 0;
1590 int test_retry_arg = -1;
1591 int test_rewrite_arg = -1;
1592 gid_t original_egid;
1593 BOOL arg_queue_only = FALSE;
1594 BOOL bi_option = FALSE;
1595 BOOL checking = FALSE;
1596 BOOL count_queue = FALSE;
1597 BOOL expansion_test = FALSE;
1598 BOOL extract_recipients = FALSE;
1599 BOOL flag_G = FALSE;
1600 BOOL flag_n = FALSE;
1601 BOOL forced_delivery = FALSE;
1602 BOOL f_end_dot = FALSE;
1603 BOOL deliver_give_up = FALSE;
1604 BOOL list_queue = FALSE;
1605 BOOL list_options = FALSE;
1606 BOOL list_config = FALSE;
1607 BOOL local_queue_only;
1608 BOOL more = TRUE;
1609 BOOL one_msg_action = FALSE;
1610 BOOL opt_D_used = FALSE;
1611 BOOL queue_only_set = FALSE;
1612 BOOL receiving_message = TRUE;
1613 BOOL sender_ident_set = FALSE;
1614 BOOL session_local_queue_only;
1615 BOOL unprivileged;
1616 BOOL removed_privilege = FALSE;
1617 BOOL usage_wanted = FALSE;
1618 BOOL verify_address_mode = FALSE;
1619 BOOL verify_as_sender = FALSE;
1620 BOOL version_printed = FALSE;
1621 uschar *alias_arg = NULL;
1622 uschar *called_as = US"";
1623 uschar *cmdline_syslog_name = NULL;
1624 uschar *start_queue_run_id = NULL;
1625 uschar *stop_queue_run_id = NULL;
1626 uschar *expansion_test_message = NULL;
1627 uschar *ftest_domain = NULL;
1628 uschar *ftest_localpart = NULL;
1629 uschar *ftest_prefix = NULL;
1630 uschar *ftest_suffix = NULL;
1631 uschar *log_oneline = NULL;
1632 uschar *malware_test_file = NULL;
1633 uschar *real_sender_address;
1634 uschar *originator_home = US"/";
1635 size_t sz;
1636
1637 struct passwd *pw;
1638 struct stat statbuf;
1639 pid_t passed_qr_pid = (pid_t)0;
1640 int passed_qr_pipe = -1;
1641 gid_t group_list[EXIM_GROUPLIST_SIZE];
1642
1643 /* For the -bI: flag */
1644 enum commandline_info info_flag = CMDINFO_NONE;
1645 BOOL info_stdout = FALSE;
1646
1647 /* Possible options for -R and -S */
1648
1649 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1650
1651 /* Need to define this in case we need to change the environment in order
1652 to get rid of a bogus time zone. We have to make it char rather than uschar
1653 because some OS define it in /usr/include/unistd.h. */
1654
1655 extern char **environ;
1656
1657 #ifdef MEASURE_TIMING
1658 (void)gettimeofday(&timestamp_startup, NULL);
1659 #endif
1660
1661 /* If the Exim user and/or group and/or the configuration file owner/group were
1662 defined by ref:name at build time, we must now find the actual uid/gid values.
1663 This is a feature to make the lives of binary distributors easier. */
1664
1665 #ifdef EXIM_USERNAME
1666 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1667 {
1668 if (exim_uid == 0)
1669 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1670
1671 /* If ref:name uses a number as the name, route_finduser() returns
1672 TRUE with exim_uid set and pw coerced to NULL. */
1673 if (pw)
1674 exim_gid = pw->pw_gid;
1675 #ifndef EXIM_GROUPNAME
1676 else
1677 exim_fail(
1678 "exim: ref:name should specify a usercode, not a group.\n"
1679 "exim: can't let you get away with it unless you also specify a group.\n");
1680 #endif
1681 }
1682 else
1683 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1684 #endif
1685
1686 #ifdef EXIM_GROUPNAME
1687 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1688 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1689 #endif
1690
1691 #ifdef CONFIGURE_OWNERNAME
1692 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1693 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1694 CONFIGURE_OWNERNAME);
1695 #endif
1696
1697 /* We default the system_filter_user to be the Exim run-time user, as a
1698 sane non-root value. */
1699 system_filter_uid = exim_uid;
1700
1701 #ifdef CONFIGURE_GROUPNAME
1702 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1703 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1704 CONFIGURE_GROUPNAME);
1705 #endif
1706
1707 /* In the Cygwin environment, some initialization used to need doing.
1708 It was fudged in by means of this macro; now no longer but we'll leave
1709 it in case of others. */
1710
1711 #ifdef OS_INIT
1712 OS_INIT
1713 #endif
1714
1715 /* Check a field which is patched when we are running Exim within its
1716 testing harness; do a fast initial check, and then the whole thing. */
1717
1718 f.running_in_test_harness =
1719 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1720 if (f.running_in_test_harness)
1721 debug_store = TRUE;
1722
1723 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1724 at the start of a program; however, it seems that some environments do not
1725 follow this. A "strange" locale can affect the formatting of timestamps, so we
1726 make quite sure. */
1727
1728 setlocale(LC_ALL, "C");
1729
1730 /* Get the offset between CLOCK_MONOTONIC and wallclock */
1731
1732 #ifdef _POSIX_MONOTONIC_CLOCK
1733 exim_clock_init();
1734 #endif
1735
1736 /* Set up the default handler for timing using alarm(). */
1737
1738 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1739
1740 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1741 because store_malloc writes a log entry on failure. */
1742
1743 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1744 exim_fail("exim: failed to get store for log buffer\n");
1745
1746 /* Initialize the default log options. */
1747
1748 bits_set(log_selector, log_selector_size, log_default);
1749
1750 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1751 NULL when the daemon is run and the file is closed. We have to use this
1752 indirection, because some systems don't allow writing to the variable "stderr".
1753 */
1754
1755 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1756
1757 /* Arrange for the PCRE regex library to use our store functions. Note that
1758 the normal calls are actually macros that add additional arguments for
1759 debugging purposes so we have to assign specially constructed functions here.
1760 The default is to use store in the stacking pool, but this is overridden in the
1761 regex_must_compile() function. */
1762
1763 pcre_malloc = function_store_get;
1764 pcre_free = function_dummy_free;
1765
1766 /* Ensure there is a big buffer for temporary use in several places. It is put
1767 in malloc store so that it can be freed for enlargement if necessary. */
1768
1769 big_buffer = store_malloc(big_buffer_size);
1770
1771 /* Set up the handler for the data request signal, and set the initial
1772 descriptive text. */
1773
1774 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1775 set_process_info("initializing");
1776 os_restarting_signal(SIGUSR1, usr1_handler);
1777
1778 /* If running in a dockerized environment, the TERM signal is only
1779 delegated to the PID 1 if we request it by setting an signal handler */
1780 if (getpid() == 1) signal(SIGTERM, term_handler);
1781
1782 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1783 in the daemon code. For the rest of Exim's uses, we ignore it. */
1784
1785 signal(SIGHUP, SIG_IGN);
1786
1787 /* We don't want to die on pipe errors as the code is written to handle
1788 the write error instead. */
1789
1790 signal(SIGPIPE, SIG_IGN);
1791
1792 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1793 set to SIG_IGN. This causes subprocesses that complete before the parent
1794 process waits for them not to hang around, so when Exim calls wait(), nothing
1795 is there. The wait() code has been made robust against this, but let's ensure
1796 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1797 ending status. We use sigaction rather than plain signal() on those OS where
1798 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1799 problem on AIX with this.) */
1800
1801 #ifdef SA_NOCLDWAIT
1802 {
1803 struct sigaction act;
1804 act.sa_handler = SIG_DFL;
1805 sigemptyset(&(act.sa_mask));
1806 act.sa_flags = 0;
1807 sigaction(SIGCHLD, &act, NULL);
1808 }
1809 #else
1810 signal(SIGCHLD, SIG_DFL);
1811 #endif
1812
1813 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1814 SIGHUP. */
1815
1816 sighup_argv = argv;
1817
1818 /* Set up the version number. Set up the leading 'E' for the external form of
1819 message ids, set the pointer to the internal form, and initialize it to
1820 indicate no message being processed. */
1821
1822 version_init();
1823 message_id_option[0] = '-';
1824 message_id_external = message_id_option + 1;
1825 message_id_external[0] = 'E';
1826 message_id = message_id_external + 1;
1827 message_id[0] = 0;
1828
1829 /* Set the umask to zero so that any files Exim creates using open() are
1830 created with the modes that it specifies. NOTE: Files created with fopen() have
1831 a problem, which was not recognized till rather late (February 2006). With this
1832 umask, such files will be world writeable. (They are all content scanning files
1833 in the spool directory, which isn't world-accessible, so this is not a
1834 disaster, but it's untidy.) I don't want to change this overall setting,
1835 however, because it will interact badly with the open() calls. Instead, there's
1836 now a function called modefopen() that fiddles with the umask while calling
1837 fopen(). */
1838
1839 (void)umask(0);
1840
1841 /* Precompile the regular expression for matching a message id. Keep this in
1842 step with the code that generates ids in the accept.c module. We need to do
1843 this here, because the -M options check their arguments for syntactic validity
1844 using mac_ismsgid, which uses this. */
1845
1846 regex_ismsgid =
1847 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1848
1849 /* Precompile the regular expression that is used for matching an SMTP error
1850 code, possibly extended, at the start of an error message. Note that the
1851 terminating whitespace character is included. */
1852
1853 regex_smtp_code =
1854 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1855 FALSE, TRUE);
1856
1857 #ifdef WHITELIST_D_MACROS
1858 /* Precompile the regular expression used to filter the content of macros
1859 given to -D for permissibility. */
1860
1861 regex_whitelisted_macro =
1862 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1863 #endif
1864
1865 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1866
1867 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1868 this seems to be a generally accepted convention, since one finds symbolic
1869 links called "mailq" in standard OS configurations. */
1870
1871 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1872 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1873 {
1874 list_queue = TRUE;
1875 receiving_message = FALSE;
1876 called_as = US"-mailq";
1877 }
1878
1879 /* If the program is called as "rmail" treat it as equivalent to
1880 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1881 i.e. preventing a single dot on a line from terminating the message, and
1882 returning with zero return code, even in cases of error (provided an error
1883 message has been sent). */
1884
1885 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1886 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1887 {
1888 f.dot_ends = FALSE;
1889 called_as = US"-rmail";
1890 errors_sender_rc = EXIT_SUCCESS;
1891 }
1892
1893 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1894 this is a smail convention. */
1895
1896 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1897 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1898 {
1899 smtp_input = smtp_batched_input = TRUE;
1900 called_as = US"-rsmtp";
1901 }
1902
1903 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1904 this is a smail convention. */
1905
1906 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1907 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1908 {
1909 queue_interval = 0;
1910 receiving_message = FALSE;
1911 called_as = US"-runq";
1912 }
1913
1914 /* If the program is called as "newaliases" treat it as equivalent to
1915 "exim -bi"; this is a sendmail convention. */
1916
1917 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1918 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1919 {
1920 bi_option = TRUE;
1921 receiving_message = FALSE;
1922 called_as = US"-newaliases";
1923 }
1924
1925 /* Save the original effective uid for a couple of uses later. It should
1926 normally be root, but in some esoteric environments it may not be. */
1927
1928 original_euid = geteuid();
1929 original_egid = getegid();
1930
1931 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1932 to be the same as the real ones. This makes a difference only if Exim is setuid
1933 (or setgid) to something other than root, which could be the case in some
1934 special configurations. */
1935
1936 real_uid = getuid();
1937 real_gid = getgid();
1938
1939 if (real_uid == root_uid)
1940 {
1941 if ((rv = setgid(real_gid)))
1942 exim_fail("exim: setgid(%ld) failed: %s\n",
1943 (long int)real_gid, strerror(errno));
1944 if ((rv = setuid(real_uid)))
1945 exim_fail("exim: setuid(%ld) failed: %s\n",
1946 (long int)real_uid, strerror(errno));
1947 }
1948
1949 /* If neither the original real uid nor the original euid was root, Exim is
1950 running in an unprivileged state. */
1951
1952 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1953
1954 /* For most of the args-parsing we need to use permanent pool memory */
1955 {
1956 int old_pool = store_pool;
1957 store_pool = POOL_PERM;
1958
1959 /* Scan the program's arguments. Some can be dealt with right away; others are
1960 simply recorded for checking and handling afterwards. Do a high-level switch
1961 on the second character (the one after '-'), to save some effort. */
1962
1963 for (i = 1; i < argc; i++)
1964 {
1965 BOOL badarg = FALSE;
1966 uschar * arg = argv[i];
1967 uschar * argrest;
1968 int switchchar;
1969
1970 /* An argument not starting with '-' is the start of a recipients list;
1971 break out of the options-scanning loop. */
1972
1973 if (arg[0] != '-')
1974 {
1975 recipients_arg = i;
1976 break;
1977 }
1978
1979 /* An option consisting of -- terminates the options */
1980
1981 if (Ustrcmp(arg, "--") == 0)
1982 {
1983 recipients_arg = i + 1;
1984 break;
1985 }
1986
1987 /* Handle flagged options */
1988
1989 switchchar = arg[1];
1990 argrest = arg+2;
1991
1992 /* Make all -ex options synonymous with -oex arguments, since that
1993 is assumed by various callers. Also make -qR options synonymous with -R
1994 options, as that seems to be required as well. Allow for -qqR too, and
1995 the same for -S options. */
1996
1997 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1998 Ustrncmp(arg+1, "qR", 2) == 0 ||
1999 Ustrncmp(arg+1, "qS", 2) == 0)
2000 {
2001 switchchar = arg[2];
2002 argrest++;
2003 }
2004 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2005 {
2006 switchchar = arg[3];
2007 argrest += 2;
2008 f.queue_2stage = TRUE;
2009 }
2010
2011 /* Make -r synonymous with -f, since it is a documented alias */
2012
2013 else if (arg[1] == 'r') switchchar = 'f';
2014
2015 /* Make -ov synonymous with -v */
2016
2017 else if (Ustrcmp(arg, "-ov") == 0)
2018 {
2019 switchchar = 'v';
2020 argrest++;
2021 }
2022
2023 /* deal with --option_aliases */
2024 else if (switchchar == '-')
2025 {
2026 if (Ustrcmp(argrest, "help") == 0)
2027 {
2028 usage_wanted = TRUE;
2029 break;
2030 }
2031 else if (Ustrcmp(argrest, "version") == 0)
2032 {
2033 switchchar = 'b';
2034 argrest = US"V";
2035 }
2036 }
2037
2038 /* High-level switch on active initial letter */
2039
2040 switch(switchchar)
2041 {
2042
2043 /* sendmail uses -Ac and -Am to control which .cf file is used;
2044 we ignore them. */
2045 case 'A':
2046 if (!*argrest) { badarg = TRUE; break; }
2047 else
2048 {
2049 BOOL ignore = FALSE;
2050 switch (*argrest)
2051 {
2052 case 'c':
2053 case 'm':
2054 if (*(argrest + 1) == '\0')
2055 ignore = TRUE;
2056 break;
2057 }
2058 if (!ignore) badarg = TRUE;
2059 }
2060 break;
2061
2062 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2063 so has no need of it. */
2064
2065 case 'B':
2066 if (!*argrest) i++; /* Skip over the type */
2067 break;
2068
2069
2070 case 'b':
2071 {
2072 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2073
2074 switch (*argrest++)
2075 {
2076 /* -bd: Run in daemon mode, awaiting SMTP connections.
2077 -bdf: Ditto, but in the foreground.
2078 */
2079 case 'd':
2080 f.daemon_listen = TRUE;
2081 if (*argrest == 'f') f.background_daemon = FALSE;
2082 else if (*argrest) badarg = TRUE;
2083 break;
2084
2085 /* -be: Run in expansion test mode
2086 -bem: Ditto, but read a message from a file first
2087 */
2088 case 'e':
2089 expansion_test = checking = TRUE;
2090 if (*argrest == 'm')
2091 {
2092 if (++i >= argc) { badarg = TRUE; break; }
2093 expansion_test_message = argv[i];
2094 argrest++;
2095 }
2096 if (*argrest) badarg = TRUE;
2097 break;
2098
2099 /* -bF: Run system filter test */
2100 case 'F':
2101 filter_test |= checking = FTEST_SYSTEM;
2102 if (*argrest) badarg = TRUE;
2103 else if (++i < argc) filter_test_sfile = argv[i];
2104 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2105 break;
2106
2107 /* -bf: Run user filter test
2108 -bfd: Set domain for filter testing
2109 -bfl: Set local part for filter testing
2110 -bfp: Set prefix for filter testing
2111 -bfs: Set suffix for filter testing
2112 */
2113 case 'f':
2114 if (!*argrest)
2115 {
2116 filter_test |= checking = FTEST_USER;
2117 if (++i < argc) filter_test_ufile = argv[i];
2118 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2119 }
2120 else
2121 {
2122 if (++i >= argc)
2123 exim_fail("exim: string expected after %s\n", arg);
2124 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
2125 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
2126 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
2127 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
2128 else badarg = TRUE;
2129 }
2130 break;
2131
2132 /* -bh: Host checking - an IP address must follow. */
2133 case 'h':
2134 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2135 {
2136 if (++i >= argc) { badarg = TRUE; break; }
2137 sender_host_address = string_copy_taint(argv[i], TRUE);
2138 host_checking = checking = f.log_testing_mode = TRUE;
2139 f.host_checking_callout = *argrest == 'c';
2140 message_logs = FALSE;
2141 }
2142 else badarg = TRUE;
2143 break;
2144
2145 /* -bi: This option is used by sendmail to initialize *the* alias file,
2146 though it has the -oA option to specify a different file. Exim has no
2147 concept of *the* alias file, but since Sun's YP make script calls
2148 sendmail this way, some support must be provided. */
2149 case 'i':
2150 if (!*++argrest) bi_option = TRUE;
2151 else badarg = TRUE;
2152 break;
2153
2154 /* -bI: provide information, of the type to follow after a colon.
2155 This is an Exim flag. */
2156 case 'I':
2157 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2158 {
2159 uschar *p = argrest+1;
2160 info_flag = CMDINFO_HELP;
2161 if (Ustrlen(p))
2162 if (strcmpic(p, CUS"sieve") == 0)
2163 {
2164 info_flag = CMDINFO_SIEVE;
2165 info_stdout = TRUE;
2166 }
2167 else if (strcmpic(p, CUS"dscp") == 0)
2168 {
2169 info_flag = CMDINFO_DSCP;
2170 info_stdout = TRUE;
2171 }
2172 else if (strcmpic(p, CUS"help") == 0)
2173 info_stdout = TRUE;
2174 }
2175 else badarg = TRUE;
2176 break;
2177
2178 /* -bm: Accept and deliver message - the default option. Reinstate
2179 receiving_message, which got turned off for all -b options.
2180 -bmalware: test the filename given for malware */
2181 case 'm':
2182 if (!*argrest) receiving_message = TRUE;
2183 else if (Ustrcmp(argrest, "alware") == 0)
2184 {
2185 if (++i >= argc) { badarg = TRUE; break; }
2186 checking = TRUE;
2187 malware_test_file = argv[i];
2188 }
2189 else badarg = TRUE;
2190 break;
2191
2192 /* -bnq: For locally originating messages, do not qualify unqualified
2193 addresses. In the envelope, this causes errors; in header lines they
2194 just get left. */
2195 case 'n':
2196 if (Ustrcmp(argrest, "q") == 0)
2197 {
2198 f.allow_unqualified_sender = FALSE;
2199 f.allow_unqualified_recipient = FALSE;
2200 }
2201 else badarg = TRUE;
2202 break;
2203
2204 /* -bpxx: List the contents of the mail queue, in various forms. If
2205 the option is -bpc, just a queue count is needed. Otherwise, if the
2206 first letter after p is r, then order is random. */
2207 case 'p':
2208 if (*argrest == 'c')
2209 {
2210 count_queue = TRUE;
2211 if (*++argrest) badarg = TRUE;
2212 break;
2213 }
2214
2215 if (*argrest == 'r')
2216 {
2217 list_queue_option = 8;
2218 argrest++;
2219 }
2220 else list_queue_option = 0;
2221
2222 list_queue = TRUE;
2223
2224 /* -bp: List the contents of the mail queue, top-level only */
2225
2226 if (!*argrest) {}
2227
2228 /* -bpu: List the contents of the mail queue, top-level undelivered */
2229
2230 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2231
2232 /* -bpa: List the contents of the mail queue, including all delivered */
2233
2234 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2235
2236 /* Unknown after -bp[r] */
2237
2238 else badarg = TRUE;
2239 break;
2240
2241
2242 /* -bP: List the configuration variables given as the address list.
2243 Force -v, so configuration errors get displayed. */
2244 case 'P':
2245
2246 /* -bP config: we need to setup here, because later,
2247 * when list_options is checked, the config is read already */
2248 if (*argrest)
2249 badarg = TRUE;
2250 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2251 {
2252 list_config = TRUE;
2253 readconf_save_config(version_string);
2254 }
2255 else
2256 {
2257 list_options = TRUE;
2258 debug_selector |= D_v;
2259 debug_file = stderr;
2260 }
2261 break;
2262
2263 /* -brt: Test retry configuration lookup */
2264 case 'r':
2265 if (Ustrcmp(argrest, "t") == 0)
2266 {
2267 checking = TRUE;
2268 test_retry_arg = i + 1;
2269 goto END_ARG;
2270 }
2271
2272 /* -brw: Test rewrite configuration */
2273
2274 else if (Ustrcmp(argrest, "w") == 0)
2275 {
2276 checking = TRUE;
2277 test_rewrite_arg = i + 1;
2278 goto END_ARG;
2279 }
2280 else badarg = TRUE;
2281 break;
2282
2283 /* -bS: Read SMTP commands on standard input, but produce no replies -
2284 all errors are reported by sending messages. */
2285 case 'S':
2286 if (!*argrest)
2287 smtp_input = smtp_batched_input = receiving_message = TRUE;
2288 else badarg = TRUE;
2289 break;
2290
2291 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2292 on standard output. */
2293 case 's':
2294 if (!*argrest) smtp_input = receiving_message = TRUE;
2295 else badarg = TRUE;
2296 break;
2297
2298 /* -bt: address testing mode */
2299 case 't':
2300 if (!*argrest)
2301 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2302 else badarg = TRUE;
2303 break;
2304
2305 /* -bv: verify addresses */
2306 case 'v':
2307 if (!*argrest)
2308 verify_address_mode = checking = f.log_testing_mode = TRUE;
2309
2310 /* -bvs: verify sender addresses */
2311
2312 else if (Ustrcmp(argrest, "s") == 0)
2313 {
2314 verify_address_mode = checking = f.log_testing_mode = TRUE;
2315 verify_as_sender = TRUE;
2316 }
2317 else badarg = TRUE;
2318 break;
2319
2320 /* -bV: Print version string and support details */
2321 case 'V':
2322 if (!*argrest)
2323 {
2324 printf("Exim version %s #%s built %s\n", version_string,
2325 version_cnumber, version_date);
2326 printf("%s\n", CS version_copyright);
2327 version_printed = TRUE;
2328 show_whats_supported(stdout);
2329 f.log_testing_mode = TRUE;
2330 }
2331 else badarg = TRUE;
2332 break;
2333
2334 /* -bw: inetd wait mode, accept a listening socket as stdin */
2335 case 'w':
2336 f.inetd_wait_mode = TRUE;
2337 f.background_daemon = FALSE;
2338 f.daemon_listen = TRUE;
2339 if (*argrest)
2340 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2341 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2342 break;
2343
2344 default:
2345 badarg = TRUE;
2346 break;
2347 }
2348 break;
2349 }
2350
2351
2352 /* -C: change configuration file list; ignore if it isn't really
2353 a change! Enforce a prefix check if required. */
2354
2355 case 'C':
2356 if (!*argrest)
2357 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2358 if (Ustrcmp(config_main_filelist, argrest) != 0)
2359 {
2360 #ifdef ALT_CONFIG_PREFIX
2361 int sep = 0;
2362 int len = Ustrlen(ALT_CONFIG_PREFIX);
2363 const uschar *list = argrest;
2364 uschar *filename;
2365 while((filename = string_nextinlist(&list, &sep, big_buffer,
2366 big_buffer_size)))
2367 if ( ( Ustrlen(filename) < len
2368 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2369 || Ustrstr(filename, "/../") != NULL
2370 )
2371 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2372 )
2373 exim_fail("-C Permission denied\n");
2374 #endif
2375 if (real_uid != root_uid)
2376 {
2377 #ifdef TRUSTED_CONFIG_LIST
2378
2379 if (real_uid != exim_uid
2380 #ifdef CONFIGURE_OWNER
2381 && real_uid != config_uid
2382 #endif
2383 )
2384 f.trusted_config = FALSE;
2385 else
2386 {
2387 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2388 if (trust_list)
2389 {
2390 struct stat statbuf;
2391
2392 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2393 (statbuf.st_uid != root_uid /* owner not root */
2394 #ifdef CONFIGURE_OWNER
2395 && statbuf.st_uid != config_uid /* owner not the special one */
2396 #endif
2397 ) || /* or */
2398 (statbuf.st_gid != root_gid /* group not root */
2399 #ifdef CONFIGURE_GROUP
2400 && statbuf.st_gid != config_gid /* group not the special one */
2401 #endif
2402 && (statbuf.st_mode & 020) != 0 /* group writeable */
2403 ) || /* or */
2404 (statbuf.st_mode & 2) != 0) /* world writeable */
2405 {
2406 f.trusted_config = FALSE;
2407 fclose(trust_list);
2408 }
2409 else
2410 {
2411 /* Well, the trust list at least is up to scratch... */
2412 rmark reset_point;
2413 uschar *trusted_configs[32];
2414 int nr_configs = 0;
2415 int i = 0;
2416 int old_pool = store_pool;
2417 store_pool = POOL_MAIN;
2418
2419 reset_point = store_mark();
2420 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2421 {
2422 uschar *start = big_buffer, *nl;
2423 while (*start && isspace(*start))
2424 start++;
2425 if (*start != '/')
2426 continue;
2427 nl = Ustrchr(start, '\n');
2428 if (nl)
2429 *nl = 0;
2430 trusted_configs[nr_configs++] = string_copy(start);
2431 if (nr_configs == nelem(trusted_configs))
2432 break;
2433 }
2434 fclose(trust_list);
2435
2436 if (nr_configs)
2437 {
2438 int sep = 0;
2439 const uschar *list = argrest;
2440 uschar *filename;
2441 while (f.trusted_config && (filename = string_nextinlist(&list,
2442 &sep, big_buffer, big_buffer_size)))
2443 {
2444 for (i=0; i < nr_configs; i++)
2445 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2446 break;
2447 if (i == nr_configs)
2448 {
2449 f.trusted_config = FALSE;
2450 break;
2451 }
2452 }
2453 }
2454 else /* No valid prefixes found in trust_list file. */
2455 f.trusted_config = FALSE;
2456 store_reset(reset_point);
2457 store_pool = old_pool;
2458 }
2459 }
2460 else /* Could not open trust_list file. */
2461 f.trusted_config = FALSE;
2462 }
2463 #else
2464 /* Not root; don't trust config */
2465 f.trusted_config = FALSE;
2466 #endif
2467 }
2468
2469 config_main_filelist = argrest;
2470 f.config_changed = TRUE;
2471 }
2472 break;
2473
2474
2475 /* -D: set up a macro definition */
2476
2477 case 'D':
2478 #ifdef DISABLE_D_OPTION
2479 exim_fail("exim: -D is not available in this Exim binary\n");
2480 #else
2481 {
2482 int ptr = 0;
2483 macro_item *m;
2484 uschar name[24];
2485 uschar *s = argrest;
2486
2487 opt_D_used = TRUE;
2488 while (isspace(*s)) s++;
2489
2490 if (*s < 'A' || *s > 'Z')
2491 exim_fail("exim: macro name set by -D must start with "
2492 "an upper case letter\n");
2493
2494 while (isalnum(*s) || *s == '_')
2495 {
2496 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2497 s++;
2498 }
2499 name[ptr] = 0;
2500 if (ptr == 0) { badarg = TRUE; break; }
2501 while (isspace(*s)) s++;
2502 if (*s != 0)
2503 {
2504 if (*s++ != '=') { badarg = TRUE; break; }
2505 while (isspace(*s)) s++;
2506 }
2507
2508 for (m = macros_user; m; m = m->next)
2509 if (Ustrcmp(m->name, name) == 0)
2510 exim_fail("exim: duplicated -D in command line\n");
2511
2512 m = macro_create(name, s, TRUE);
2513
2514 if (clmacro_count >= MAX_CLMACROS)
2515 exim_fail("exim: too many -D options on command line\n");
2516 clmacros[clmacro_count++] =
2517 string_sprintf("-D%s=%s", m->name, m->replacement);
2518 }
2519 #endif
2520 break;
2521
2522 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2523 The latter is now a no-op, retained for compatibility only. If -dd is used,
2524 debugging subprocesses of the daemon is disabled. */
2525
2526 case 'd':
2527 if (Ustrcmp(argrest, "ropcr") == 0)
2528 {
2529 /* drop_cr = TRUE; */
2530 }
2531
2532 /* Use an intermediate variable so that we don't set debugging while
2533 decoding the debugging bits. */
2534
2535 else
2536 {
2537 unsigned int selector = D_default;
2538 debug_selector = 0;
2539 debug_file = NULL;
2540 if (*argrest == 'd')
2541 {
2542 f.debug_daemon = TRUE;
2543 argrest++;
2544 }
2545 if (*argrest)
2546 decode_bits(&selector, 1, debug_notall, argrest,
2547 debug_options, debug_options_count, US"debug", 0);
2548 debug_selector = selector;
2549 }
2550 break;
2551
2552
2553 /* -E: This is a local error message. This option is not intended for
2554 external use at all, but is not restricted to trusted callers because it
2555 does no harm (just suppresses certain error messages) and if Exim is run
2556 not setuid root it won't always be trusted when it generates error
2557 messages using this option. If there is a message id following -E, point
2558 message_reference at it, for logging. */
2559
2560 case 'E':
2561 f.local_error_message = TRUE;
2562 if (mac_ismsgid(argrest)) message_reference = argrest;
2563 break;
2564
2565
2566 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2567 option, so it looks as if historically the -oex options are also callable
2568 without the leading -o. So we have to accept them. Before the switch,
2569 anything starting -oe has been converted to -e. Exim does not support all
2570 of the sendmail error options. */
2571
2572 case 'e':
2573 if (Ustrcmp(argrest, "e") == 0)
2574 {
2575 arg_error_handling = ERRORS_SENDER;
2576 errors_sender_rc = EXIT_SUCCESS;
2577 }
2578 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2579 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2580 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2581 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2582 else badarg = TRUE;
2583 break;
2584
2585
2586 /* -F: Set sender's full name, used instead of the gecos entry from
2587 the password file. Since users can usually alter their gecos entries,
2588 there's no security involved in using this instead. The data can follow
2589 the -F or be in the next argument. */
2590
2591 case 'F':
2592 if (!*argrest)
2593 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2594 originator_name = string_copy_taint(argrest, TRUE);
2595 f.sender_name_forced = TRUE;
2596 break;
2597
2598
2599 /* -f: Set sender's address - this value is only actually used if Exim is
2600 run by a trusted user, or if untrusted_set_sender is set and matches the
2601 address, except that the null address can always be set by any user. The
2602 test for this happens later, when the value given here is ignored when not
2603 permitted. For an untrusted user, the actual sender is still put in Sender:
2604 if it doesn't match the From: header (unless no_local_from_check is set).
2605 The data can follow the -f or be in the next argument. The -r switch is an
2606 obsolete form of -f but since there appear to be programs out there that
2607 use anything that sendmail has ever supported, better accept it - the
2608 synonymizing is done before the switch above.
2609
2610 At this stage, we must allow domain literal addresses, because we don't
2611 know what the setting of allow_domain_literals is yet. Ditto for trailing
2612 dots and strip_trailing_dot. */
2613
2614 case 'f':
2615 {
2616 int dummy_start, dummy_end;
2617 uschar *errmess;
2618 if (!*argrest)
2619 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2620 if (!*argrest)
2621 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2622 else
2623 {
2624 uschar * temp = argrest + Ustrlen(argrest) - 1;
2625 while (temp >= argrest && isspace(*temp)) temp--;
2626 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2627 allow_domain_literals = TRUE;
2628 strip_trailing_dot = TRUE;
2629 #ifdef SUPPORT_I18N
2630 allow_utf8_domains = TRUE;
2631 #endif
2632 if (!(sender_address = parse_extract_address(argrest, &errmess,
2633 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2634 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2635
2636 sender_address = string_copy_taint(sender_address, TRUE);
2637 #ifdef SUPPORT_I18N
2638 message_smtputf8 = string_is_utf8(sender_address);
2639 allow_utf8_domains = FALSE;
2640 #endif
2641 allow_domain_literals = FALSE;
2642 strip_trailing_dot = FALSE;
2643 }
2644 f.sender_address_forced = TRUE;
2645 }
2646 break;
2647
2648 /* -G: sendmail invocation to specify that it's a gateway submission and
2649 sendmail may complain about problems instead of fixing them.
2650 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2651 not at this time complain about problems. */
2652
2653 case 'G':
2654 flag_G = TRUE;
2655 break;
2656
2657 /* -h: Set the hop count for an incoming message. Exim does not currently
2658 support this; it always computes it by counting the Received: headers.
2659 To put it in will require a change to the spool header file format. */
2660
2661 case 'h':
2662 if (!*argrest)
2663 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2664 if (!isdigit(*argrest)) badarg = TRUE;
2665 break;
2666
2667
2668 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2669 not to be documented for sendmail but mailx (at least) uses it) */
2670
2671 case 'i':
2672 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2673 break;
2674
2675
2676 /* -L: set the identifier used for syslog; equivalent to setting
2677 syslog_processname in the config file, but needs to be an admin option. */
2678
2679 case 'L':
2680 if (!*argrest)
2681 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2682 if ((sz = Ustrlen(argrest)) > 32)
2683 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2684 if (sz < 1)
2685 exim_fail("exim: the -L syslog name is too short\n");
2686 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2687 break;
2688
2689 case 'M':
2690 receiving_message = FALSE;
2691
2692 /* -MC: continue delivery of another message via an existing open
2693 file descriptor. This option is used for an internal call by the
2694 smtp transport when there is a pending message waiting to go to an
2695 address to which it has got a connection. Five subsequent arguments are
2696 required: transport name, host name, IP address, sequence number, and
2697 message_id. Transports may decline to create new processes if the sequence
2698 number gets too big. The channel is stdin. This (-MC) must be the last
2699 argument. There's a subsequent check that the real-uid is privileged.
2700
2701 If we are running in the test harness. delay for a bit, to let the process
2702 that set this one up complete. This makes for repeatability of the logging,
2703 etc. output. */
2704
2705 if (Ustrcmp(argrest, "C") == 0)
2706 {
2707 union sockaddr_46 interface_sock;
2708 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2709
2710 if (argc != i + 6)
2711 exim_fail("exim: too many or too few arguments after -MC\n");
2712
2713 if (msg_action_arg >= 0)
2714 exim_fail("exim: incompatible arguments\n");
2715
2716 continue_transport = string_copy_taint(argv[++i], TRUE);
2717 continue_hostname = string_copy_taint(argv[++i], TRUE);
2718 continue_host_address = string_copy_taint(argv[++i], TRUE);
2719 continue_sequence = Uatoi(argv[++i]);
2720 msg_action = MSG_DELIVER;
2721 msg_action_arg = ++i;
2722 forced_delivery = TRUE;
2723 queue_run_pid = passed_qr_pid;
2724 queue_run_pipe = passed_qr_pipe;
2725
2726 if (!mac_ismsgid(argv[i]))
2727 exim_fail("exim: malformed message id %s after -MC option\n",
2728 argv[i]);
2729
2730 /* Set up $sending_ip_address and $sending_port, unless proxied */
2731
2732 if (!continue_proxy_cipher)
2733 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2734 &size) == 0)
2735 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2736 &sending_port);
2737 else
2738 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2739 strerror(errno));
2740
2741 testharness_pause_ms(500);
2742 break;
2743 }
2744
2745 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2746 {
2747 switch(argrest[1])
2748 {
2749 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2750 precedes -MC (see above). The flag indicates that the host to which
2751 Exim is connected has accepted an AUTH sequence. */
2752
2753 case 'A': f.smtp_authenticated = TRUE; break;
2754
2755 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2756 that exim is connected to supports the esmtp extension DSN */
2757
2758 case 'D': smtp_peer_options |= OPTION_DSN; break;
2759
2760 /* -MCd: for debug, set a process-purpose string */
2761
2762 case 'd': if (++i < argc)
2763 process_purpose = string_copy_taint(argv[i], TRUE);
2764 else badarg = TRUE;
2765 break;
2766
2767 /* -MCG: set the queue name, to a non-default value */
2768
2769 case 'G': if (++i < argc) queue_name = string_copy_taint(argv[i], TRUE);
2770 else badarg = TRUE;
2771 break;
2772
2773 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2774
2775 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2776
2777 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2778 it preceded -MC (see above) */
2779
2780 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2781
2782 /* -MCQ: pass on the pid of the queue-running process that started
2783 this chain of deliveries and the fd of its synchronizing pipe; this
2784 is useful only when it precedes -MC (see above) */
2785
2786 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2787 else badarg = TRUE;
2788 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2789 else badarg = TRUE;
2790 break;
2791
2792 /* -MCS: set the smtp_use_size flag; this is useful only when it
2793 precedes -MC (see above) */
2794
2795 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2796
2797 #ifndef DISABLE_TLS
2798 /* -MCt: similar to -MCT below but the connection is still open
2799 via a proxy process which handles the TLS context and coding.
2800 Require three arguments for the proxied local address and port,
2801 and the TLS cipher. */
2802
2803 case 't': if (++i < argc)
2804 sending_ip_address = string_copy_taint(argv[i], TRUE);
2805 else badarg = TRUE;
2806 if (++i < argc)
2807 sending_port = (int)(Uatol(argv[i]));
2808 else badarg = TRUE;
2809 if (++i < argc)
2810 continue_proxy_cipher = string_copy_taint(argv[i], TRUE);
2811 else badarg = TRUE;
2812 /*FALLTHROUGH*/
2813
2814 /* -MCT: set the tls_offered flag; this is useful only when it
2815 precedes -MC (see above). The flag indicates that the host to which
2816 Exim is connected has offered TLS support. */
2817
2818 case 'T': smtp_peer_options |= OPTION_TLS; break;
2819 #endif
2820
2821 default: badarg = TRUE; break;
2822 }
2823 break;
2824 }
2825
2826 /* -M[x]: various operations on the following list of message ids:
2827 -M deliver the messages, ignoring next retry times and thawing
2828 -Mc deliver the messages, checking next retry times, no thawing
2829 -Mf freeze the messages
2830 -Mg give up on the messages
2831 -Mt thaw the messages
2832 -Mrm remove the messages
2833 In the above cases, this must be the last option. There are also the
2834 following options which are followed by a single message id, and which
2835 act on that message. Some of them use the "recipient" addresses as well.
2836 -Mar add recipient(s)
2837 -Mmad mark all recipients delivered
2838 -Mmd mark recipients(s) delivered
2839 -Mes edit sender
2840 -Mset load a message for use with -be
2841 -Mvb show body
2842 -Mvc show copy (of whole message, in RFC 2822 format)
2843 -Mvh show header
2844 -Mvl show log
2845 */
2846
2847 else if (!*argrest)
2848 {
2849 msg_action = MSG_DELIVER;
2850 forced_delivery = f.deliver_force_thaw = TRUE;
2851 }
2852 else if (Ustrcmp(argrest, "ar") == 0)
2853 {
2854 msg_action = MSG_ADD_RECIPIENT;
2855 one_msg_action = TRUE;
2856 }
2857 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2858 else if (Ustrcmp(argrest, "es") == 0)
2859 {
2860 msg_action = MSG_EDIT_SENDER;
2861 one_msg_action = TRUE;
2862 }
2863 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2864 else if (Ustrcmp(argrest, "g") == 0)
2865 {
2866 msg_action = MSG_DELIVER;
2867 deliver_give_up = TRUE;
2868 }
2869 else if (Ustrcmp(argrest, "G") == 0)
2870 {
2871 msg_action = MSG_SETQUEUE;
2872 queue_name_dest = string_copy_taint(argv[++i], TRUE);
2873 }
2874 else if (Ustrcmp(argrest, "mad") == 0)
2875 {
2876 msg_action = MSG_MARK_ALL_DELIVERED;
2877 }
2878 else if (Ustrcmp(argrest, "md") == 0)
2879 {
2880 msg_action = MSG_MARK_DELIVERED;
2881 one_msg_action = TRUE;
2882 }
2883 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2884 else if (Ustrcmp(argrest, "set") == 0)
2885 {
2886 msg_action = MSG_LOAD;
2887 one_msg_action = TRUE;
2888 }
2889 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2890 else if (Ustrcmp(argrest, "vb") == 0)
2891 {
2892 msg_action = MSG_SHOW_BODY;
2893 one_msg_action = TRUE;
2894 }
2895 else if (Ustrcmp(argrest, "vc") == 0)
2896 {
2897 msg_action = MSG_SHOW_COPY;
2898 one_msg_action = TRUE;
2899 }
2900 else if (Ustrcmp(argrest, "vh") == 0)
2901 {
2902 msg_action = MSG_SHOW_HEADER;
2903 one_msg_action = TRUE;
2904 }
2905 else if (Ustrcmp(argrest, "vl") == 0)
2906 {
2907 msg_action = MSG_SHOW_LOG;
2908 one_msg_action = TRUE;
2909 }
2910 else { badarg = TRUE; break; }
2911
2912 /* All the -Mxx options require at least one message id. */
2913
2914 msg_action_arg = i + 1;
2915 if (msg_action_arg >= argc)
2916 exim_fail("exim: no message ids given after %s option\n", arg);
2917
2918 /* Some require only message ids to follow */
2919
2920 if (!one_msg_action)
2921 {
2922 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2923 exim_fail("exim: malformed message id %s after %s option\n",
2924 argv[j], arg);
2925 goto END_ARG; /* Remaining args are ids */
2926 }
2927
2928 /* Others require only one message id, possibly followed by addresses,
2929 which will be handled as normal arguments. */
2930
2931 else
2932 {
2933 if (!mac_ismsgid(argv[msg_action_arg]))
2934 exim_fail("exim: malformed message id %s after %s option\n",
2935 argv[msg_action_arg], arg);
2936 i++;
2937 }
2938 break;
2939
2940
2941 /* Some programs seem to call the -om option without the leading o;
2942 for sendmail it askes for "me too". Exim always does this. */
2943
2944 case 'm':
2945 if (*argrest) badarg = TRUE;
2946 break;
2947
2948
2949 /* -N: don't do delivery - a debugging option that stops transports doing
2950 their thing. It implies debugging at the D_v level. */
2951
2952 case 'N':
2953 if (!*argrest)
2954 {
2955 f.dont_deliver = TRUE;
2956 debug_selector |= D_v;
2957 debug_file = stderr;
2958 }
2959 else badarg = TRUE;
2960 break;
2961
2962
2963 /* -n: This means "don't alias" in sendmail, apparently.
2964 For normal invocations, it has no effect.
2965 It may affect some other options. */
2966
2967 case 'n':
2968 flag_n = TRUE;
2969 break;
2970
2971 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2972 option to the specified value. This form uses long names. We need to handle
2973 -O option=value and -Ooption=value. */
2974
2975 case 'O':
2976 if (!*argrest)
2977 if (++i >= argc)
2978 exim_fail("exim: string expected after -O\n");
2979 break;
2980
2981 case 'o':
2982 switch (*argrest++)
2983 {
2984 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2985 file" option). */
2986 case 'A':
2987 if (!*(alias_arg = argrest))
2988 if (i+1 < argc) alias_arg = argv[++i];
2989 else exim_fail("exim: string expected after -oA\n");
2990 break;
2991
2992 /* -oB: Set a connection message max value for remote deliveries */
2993 case 'B':
2994 {
2995 uschar * p = argrest;
2996 if (!*p)
2997 if (i+1 < argc && isdigit((argv[i+1][0])))
2998 p = argv[++i];
2999 else
3000 {
3001 connection_max_messages = 1;
3002 p = NULL;
3003 }
3004
3005 if (p)
3006 {
3007 if (!isdigit(*p))
3008 exim_fail("exim: number expected after -oB\n");
3009 connection_max_messages = Uatoi(p);
3010 }
3011 }
3012 break;
3013
3014 /* -odb: background delivery */
3015
3016 case 'd':
3017 if (Ustrcmp(argrest, "b") == 0)
3018 {
3019 f.synchronous_delivery = FALSE;
3020 arg_queue_only = FALSE;
3021 queue_only_set = TRUE;
3022 }
3023
3024 /* -odd: testsuite-only: add no inter-process delays */
3025
3026 else if (Ustrcmp(argrest, "d") == 0)
3027 f.testsuite_delays = FALSE;
3028
3029 /* -odf: foreground delivery (smail-compatible option); same effect as
3030 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3031 */
3032
3033 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3034 {
3035 f.synchronous_delivery = TRUE;
3036 arg_queue_only = FALSE;
3037 queue_only_set = TRUE;
3038 }
3039
3040 /* -odq: queue only */
3041
3042 else if (Ustrcmp(argrest, "q") == 0)
3043 {
3044 f.synchronous_delivery = FALSE;
3045 arg_queue_only = TRUE;
3046 queue_only_set = TRUE;
3047 }
3048
3049 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3050 but no remote delivery */
3051
3052 else if (Ustrcmp(argrest, "qs") == 0)
3053 {
3054 f.queue_smtp = TRUE;
3055 arg_queue_only = FALSE;
3056 queue_only_set = TRUE;
3057 }
3058 else badarg = TRUE;
3059 break;
3060
3061 /* -oex: Sendmail error flags. As these are also accepted without the
3062 leading -o prefix, for compatibility with vacation and other callers,
3063 they are handled with -e above. */
3064
3065 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3066 -oitrue: Another sendmail syntax for the same */
3067
3068 case 'i':
3069 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3070 f.dot_ends = FALSE;
3071 else badarg = TRUE;
3072 break;
3073
3074 /* -oM*: Set various characteristics for an incoming message; actually
3075 acted on for trusted callers only. */
3076
3077 case 'M':
3078 {
3079 if (i+1 >= argc)
3080 exim_fail("exim: data expected after -oM%s\n", argrest);
3081
3082 /* -oMa: Set sender host address */
3083
3084 if (Ustrcmp(argrest, "a") == 0)
3085 sender_host_address = string_copy_taint(argv[++i], TRUE);
3086
3087 /* -oMaa: Set authenticator name */
3088
3089 else if (Ustrcmp(argrest, "aa") == 0)
3090 sender_host_authenticated = string_copy_taint(argv[++i], TRUE);
3091
3092 /* -oMas: setting authenticated sender */
3093
3094 else if (Ustrcmp(argrest, "as") == 0)
3095 authenticated_sender = string_copy_taint(argv[++i], TRUE);
3096
3097 /* -oMai: setting authenticated id */
3098
3099 else if (Ustrcmp(argrest, "ai") == 0)
3100 authenticated_id = string_copy_taint(argv[++i], TRUE);
3101
3102 /* -oMi: Set incoming interface address */
3103
3104 else if (Ustrcmp(argrest, "i") == 0)
3105 interface_address = string_copy_taint(argv[++i], TRUE);
3106
3107 /* -oMm: Message reference */
3108
3109 else if (Ustrcmp(argrest, "m") == 0)
3110 {
3111 if (!mac_ismsgid(argv[i+1]))
3112 exim_fail("-oMm must be a valid message ID\n");
3113 if (!f.trusted_config)
3114 exim_fail("-oMm must be called by a trusted user/config\n");
3115 message_reference = argv[++i];
3116 }
3117
3118 /* -oMr: Received protocol */
3119
3120 else if (Ustrcmp(argrest, "r") == 0)
3121
3122 if (received_protocol)
3123 exim_fail("received_protocol is set already\n");
3124 else
3125 received_protocol = string_copy_taint(argv[++i], TRUE);
3126
3127 /* -oMs: Set sender host name */
3128
3129 else if (Ustrcmp(argrest, "s") == 0)
3130 sender_host_name = string_copy_taint(argv[++i], TRUE);
3131
3132 /* -oMt: Set sender ident */
3133
3134 else if (Ustrcmp(argrest, "t") == 0)
3135 {
3136 sender_ident_set = TRUE;
3137 sender_ident = string_copy_taint(argv[++i], TRUE);
3138 }
3139
3140 /* Else a bad argument */
3141
3142 else
3143 badarg = TRUE;
3144 }
3145 break;
3146
3147 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3148 seem to call this as -m (undocumented), so that is also accepted (see
3149 above). */
3150 /* -oo: An ancient flag for old-style addresses which still seems to
3151 crop up in some calls (see in SCO). */
3152
3153 case 'm':
3154 case 'o':
3155 if (*argrest) badarg = TRUE;
3156 break;
3157
3158 /* -oP <name>: set pid file path for daemon
3159 -oPX: delete pid file of daemon */
3160
3161 case 'P':
3162 if (!*argrest) override_pid_file_path = argv[++i];
3163 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3164 else badarg = TRUE;
3165 break;
3166
3167
3168 /* -or <n>: set timeout for non-SMTP acceptance
3169 -os <n>: set timeout for SMTP acceptance */
3170
3171 case 'r':
3172 case 's':
3173 {
3174 int * tp = argrest[-1] == 'r'
3175 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3176 if (*argrest)
3177 *tp = readconf_readtime(argrest, 0, FALSE);
3178 else if (i+1 < argc)
3179 *tp = readconf_readtime(argv[++i], 0, FALSE);
3180
3181 if (*tp < 0)
3182 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3183 }
3184 break;
3185
3186 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3187
3188 case 'X':
3189 if (*argrest) badarg = TRUE;
3190 else override_local_interfaces = string_copy_taint(argv[++i], TRUE);
3191 break;
3192
3193 /* Unknown -o argument */
3194
3195 default:
3196 badarg = TRUE;
3197 }
3198 break;
3199
3200
3201 /* -ps: force Perl startup; -pd force delayed Perl startup */
3202
3203 case 'p':
3204 #ifdef EXIM_PERL
3205 if (*argrest == 's' && argrest[1] == 0)
3206 {
3207 perl_start_option = 1;
3208 break;
3209 }
3210 if (*argrest == 'd' && argrest[1] == 0)
3211 {
3212 perl_start_option = -1;
3213 break;
3214 }
3215 #endif
3216
3217 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3218 which sets the host protocol and host name */
3219
3220 if (!*argrest)
3221 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3222
3223 if (*argrest)
3224 {
3225 uschar * hn = Ustrchr(argrest, ':');
3226
3227 if (received_protocol)
3228 exim_fail("received_protocol is set already\n");
3229
3230 if (!hn)
3231 received_protocol = string_copy_taint(argrest, TRUE);
3232 else
3233 {
3234 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3235 sender_host_name = string_copy_taint(hn + 1, TRUE);
3236 }
3237 }
3238 break;
3239
3240
3241 case 'q':
3242 receiving_message = FALSE;
3243 if (queue_interval >= 0)
3244 exim_fail("exim: -q specified more than once\n");
3245
3246 /* -qq...: Do queue runs in a 2-stage manner */
3247
3248 if (*argrest == 'q')
3249 {
3250 f.queue_2stage = TRUE;
3251 argrest++;
3252 }
3253
3254 /* -qi...: Do only first (initial) deliveries */
3255
3256 if (*argrest == 'i')
3257 {
3258 f.queue_run_first_delivery = TRUE;
3259 argrest++;
3260 }
3261
3262 /* -qf...: Run the queue, forcing deliveries
3263 -qff..: Ditto, forcing thawing as well */
3264
3265 if (*argrest == 'f')
3266 {
3267 f.queue_run_force = TRUE;
3268 if (*++argrest == 'f')
3269 {
3270 f.deliver_force_thaw = TRUE;
3271 argrest++;
3272 }
3273 }
3274
3275 /* -q[f][f]l...: Run the queue only on local deliveries */
3276
3277 if (*argrest == 'l')
3278 {
3279 f.queue_run_local = TRUE;
3280 argrest++;
3281 }
3282
3283 /* -q[f][f][l][G<name>]... Work on the named queue */
3284
3285 if (*argrest == 'G')
3286 {
3287 int i;
3288 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3289 queue_name = string_copyn(argrest, i);
3290 argrest += i;
3291 if (*argrest == '/') argrest++;
3292 }
3293
3294 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3295 only, optionally named, optionally starting from a given message id. */
3296
3297 if (!(list_queue || count_queue))
3298 if ( !*argrest
3299 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3300 {
3301 queue_interval = 0;
3302 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3303 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3304 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3305 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3306 }
3307
3308 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3309 forced, optionally local only, optionally named. */
3310
3311 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3312 0, FALSE)) <= 0)
3313 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3314 break;
3315
3316
3317 case 'R': /* Synonymous with -qR... */
3318 receiving_message = FALSE;
3319
3320 /* -Rf: As -R (below) but force all deliveries,
3321 -Rff: Ditto, but also thaw all frozen messages,
3322 -Rr: String is regex
3323 -Rrf: Regex and force
3324 -Rrff: Regex and force and thaw
3325
3326 in all cases provided there are no further characters in this
3327 argument. */
3328
3329 if (*argrest)
3330 for (int i = 0; i < nelem(rsopts); i++)
3331 if (Ustrcmp(argrest, rsopts[i]) == 0)
3332 {
3333 if (i != 2) f.queue_run_force = TRUE;
3334 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3335 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3336 argrest += Ustrlen(rsopts[i]);
3337 }
3338
3339 /* -R: Set string to match in addresses for forced queue run to
3340 pick out particular messages. */
3341
3342 if (*argrest)
3343 deliver_selectstring = string_copy_taint(argrest, TRUE);
3344 else if (i+1 < argc)
3345 deliver_selectstring = string_copy_taint(argv[++i], TRUE);
3346 else
3347 exim_fail("exim: string expected after -R\n");
3348 break;
3349
3350
3351 /* -r: an obsolete synonym for -f (see above) */
3352
3353
3354 /* -S: Like -R but works on sender. */
3355
3356 case 'S': /* Synonymous with -qS... */
3357 receiving_message = FALSE;
3358
3359 /* -Sf: As -S (below) but force all deliveries,
3360 -Sff: Ditto, but also thaw all frozen messages,
3361 -Sr: String is regex
3362 -Srf: Regex and force
3363 -Srff: Regex and force and thaw
3364
3365 in all cases provided there are no further characters in this
3366 argument. */
3367
3368 if (*argrest)
3369 for (int i = 0; i < nelem(rsopts); i++)
3370 if (Ustrcmp(argrest, rsopts[i]) == 0)
3371 {
3372 if (i != 2) f.queue_run_force = TRUE;
3373 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3374 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3375 argrest += Ustrlen(rsopts[i]);
3376 }
3377
3378 /* -S: Set string to match in addresses for forced queue run to
3379 pick out particular messages. */
3380
3381 if (*argrest)
3382 deliver_selectstring_sender = string_copy_taint(argrest, TRUE);
3383 else if (i+1 < argc)
3384 deliver_selectstring_sender = string_copy_taint(argv[++i], TRUE);
3385 else
3386 exim_fail("exim: string expected after -S\n");
3387 break;
3388
3389 /* -Tqt is an option that is exclusively for use by the testing suite.
3390 It is not recognized in other circumstances. It allows for the setting up
3391 of explicit "queue times" so that various warning/retry things can be
3392 tested. Otherwise variability of clock ticks etc. cause problems. */
3393
3394 case 'T':
3395 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3396 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3397 else badarg = TRUE;
3398 break;
3399
3400
3401 /* -t: Set flag to extract recipients from body of message. */
3402
3403 case 't':
3404 if (!*argrest) extract_recipients = TRUE;
3405
3406 /* -ti: Set flag to extract recipients from body of message, and also
3407 specify that dot does not end the message. */
3408
3409 else if (Ustrcmp(argrest, "i") == 0)
3410 {
3411 extract_recipients = TRUE;
3412 f.dot_ends = FALSE;
3413 }
3414
3415 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3416
3417 #ifndef DISABLE_TLS
3418 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3419 #endif
3420
3421 else badarg = TRUE;
3422 break;
3423
3424
3425 /* -U: This means "initial user submission" in sendmail, apparently. The
3426 doc claims that in future sendmail may refuse syntactically invalid
3427 messages instead of fixing them. For the moment, we just ignore it. */
3428
3429 case 'U':
3430 break;
3431
3432
3433 /* -v: verify things - this is a very low-level debugging */
3434
3435 case 'v':
3436 if (!*argrest)
3437 {
3438 debug_selector |= D_v;
3439 debug_file = stderr;
3440 }
3441 else badarg = TRUE;
3442 break;
3443
3444
3445 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3446
3447 The -x flag tells the sendmail command that mail from a local
3448 mail program has National Language Support (NLS) extended characters
3449 in the body of the mail item. The sendmail command can send mail with
3450 extended NLS characters across networks that normally corrupts these
3451 8-bit characters.
3452
3453 As Exim is 8-bit clean, it just ignores this flag. */
3454
3455 case 'x':
3456 if (*argrest) badarg = TRUE;
3457 break;
3458
3459 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3460 logs to that file. We swallow the parameter and otherwise ignore it. */
3461
3462 case 'X':
3463 if (!*argrest)
3464 if (++i >= argc)
3465 exim_fail("exim: string expected after -X\n");
3466 break;
3467
3468 case 'z':
3469 if (!*argrest)
3470 if (++i < argc)
3471 log_oneline = string_copy_taint(argv[i], TRUE);
3472 else
3473 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3474 break;
3475
3476 /* All other initial characters are errors */
3477
3478 default:
3479 badarg = TRUE;
3480 break;
3481 } /* End of high-level switch statement */
3482
3483 /* Failed to recognize the option, or syntax error */
3484
3485 if (badarg)
3486 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3487 "option %s\n", arg);
3488 }
3489
3490
3491 /* If -R or -S have been specified without -q, assume a single queue run. */
3492
3493 if ( (deliver_selectstring || deliver_selectstring_sender)
3494 && queue_interval < 0)
3495 queue_interval = 0;
3496
3497
3498 END_ARG:
3499 store_pool = old_pool;
3500 }
3501
3502 /* If usage_wanted is set we call the usage function - which never returns */
3503 if (usage_wanted) exim_usage(called_as);
3504
3505 /* Arguments have been processed. Check for incompatibilities. */
3506 if ((
3507 (smtp_input || extract_recipients || recipients_arg < argc) &&
3508 (f.daemon_listen || queue_interval >= 0 || bi_option ||
3509 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
3510 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
3511 ) ||
3512 (
3513 msg_action_arg > 0 &&
3514 (f.daemon_listen || queue_interval > 0 || list_options ||
3515 (checking && msg_action != MSG_LOAD) ||
3516 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
3517 ) ||
3518 (
3519 (f.daemon_listen || queue_interval > 0) &&
3520 (sender_address != NULL || list_options || list_queue || checking ||
3521 bi_option)
3522 ) ||
3523 (
3524 f.daemon_listen && queue_interval == 0
3525 ) ||
3526 (
3527 f.inetd_wait_mode && queue_interval >= 0
3528 ) ||
3529 (
3530 list_options &&
3531 (checking || smtp_input || extract_recipients ||
3532 filter_test != FTEST_NONE || bi_option)
3533 ) ||
3534 (
3535 verify_address_mode &&
3536 (f.address_test_mode || smtp_input || extract_recipients ||
3537 filter_test != FTEST_NONE || bi_option)
3538 ) ||
3539 (
3540 f.address_test_mode && (smtp_input || extract_recipients ||
3541 filter_test != FTEST_NONE || bi_option)
3542 ) ||
3543 (
3544 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3545 extract_recipients)
3546 ) ||
3547 (
3548 deliver_selectstring != NULL && queue_interval < 0
3549 ) ||
3550 (
3551 msg_action == MSG_LOAD &&
3552 (!expansion_test || expansion_test_message != NULL)
3553 )
3554 )
3555 exim_fail("exim: incompatible command-line options or arguments\n");
3556
3557 /* If debugging is set up, set the file and the file descriptor to pass on to
3558 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3559 to run in the foreground. */
3560
3561 if (debug_selector != 0)
3562 {
3563 debug_file = stderr;
3564 debug_fd = fileno(debug_file);
3565 f.background_daemon = FALSE;
3566 testharness_pause_ms(100); /* lets caller finish */
3567 if (debug_selector != D_v) /* -v only doesn't show this */
3568 {
3569 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3570 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3571 debug_selector);
3572 if (!version_printed)
3573 show_whats_supported(stderr);
3574 }
3575 }
3576
3577 /* When started with root privilege, ensure that the limits on the number of
3578 open files and the number of processes (where that is accessible) are
3579 sufficiently large, or are unset, in case Exim has been called from an
3580 environment where the limits are screwed down. Not all OS have the ability to
3581 change some of these limits. */
3582
3583 if (unprivileged)
3584 {
3585 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3586 }
3587 else
3588 {
3589 struct rlimit rlp;
3590
3591 #ifdef RLIMIT_NOFILE
3592 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3593 {
3594 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3595 strerror(errno));
3596 rlp.rlim_cur = rlp.rlim_max = 0;
3597 }
3598
3599 /* I originally chose 1000 as a nice big number that was unlikely to
3600 be exceeded. It turns out that some older OS have a fixed upper limit of
3601 256. */
3602
3603 if (rlp.rlim_cur < 1000)
3604 {
3605 rlp.rlim_cur = rlp.rlim_max = 1000;
3606 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3607 {
3608 rlp.rlim_cur = rlp.rlim_max = 256;
3609 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3610 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3611 strerror(errno));
3612 }
3613 }
3614 #endif
3615
3616 #ifdef RLIMIT_NPROC
3617 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3618 {
3619 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3620 strerror(errno));
3621 rlp.rlim_cur = rlp.rlim_max = 0;
3622 }
3623
3624 #ifdef RLIM_INFINITY
3625 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3626 {
3627 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3628 #else
3629 if (rlp.rlim_cur < 1000)
3630 {
3631 rlp.rlim_cur = rlp.rlim_max = 1000;
3632 #endif
3633 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3634 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3635 strerror(errno));
3636 }
3637 #endif
3638 }
3639
3640 /* Exim is normally entered as root (but some special configurations are
3641 possible that don't do this). However, it always spins off sub-processes that
3642 set their uid and gid as required for local delivery. We don't want to pass on
3643 any extra groups that root may belong to, so we want to get rid of them all at
3644 this point.
3645
3646 We need to obey setgroups() at this stage, before possibly giving up root
3647 privilege for a changed configuration file, but later on we might need to
3648 check on the additional groups for the admin user privilege - can't do that
3649 till after reading the config, which might specify the exim gid. Therefore,
3650 save the group list here first. */
3651
3652 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3653 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3654
3655 /* There is a fundamental difference in some BSD systems in the matter of
3656 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3657 known not to be different. On the "different" systems there is a single group
3658 list, and the first entry in it is the current group. On all other versions of
3659 Unix there is a supplementary group list, which is in *addition* to the current
3660 group. Consequently, to get rid of all extraneous groups on a "standard" system
3661 you pass over 0 groups to setgroups(), while on a "different" system you pass
3662 over a single group - the current group, which is always the first group in the
3663 list. Calling setgroups() with zero groups on a "different" system results in
3664 an error return. The following code should cope with both types of system.
3665
3666 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3667 the "setgroups() with zero groups" - and changes the egid.
3668 Thanks to that we had to stash the original_egid above, for use below
3669 in the call to exim_setugid().
3670
3671 However, if this process isn't running as root, setgroups() can't be used
3672 since you have to be root to run it, even if throwing away groups.
3673 Except, sigh, for Hurd - where you can.
3674 Not being root here happens only in some unusual configurations. */
3675
3676 if ( !unprivileged
3677 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3678 && setgroups(0, NULL) != 0
3679 #endif
3680 && setgroups(1, group_list) != 0)
3681 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3682
3683 /* If the configuration file name has been altered by an argument on the
3684 command line (either a new file name or a macro definition) and the caller is
3685 not root, or if this is a filter testing run, remove any setuid privilege the
3686 program has and run as the underlying user.
3687
3688 The exim user is locked out of this, which severely restricts the use of -C
3689 for some purposes.
3690
3691 Otherwise, set the real ids to the effective values (should be root unless run
3692 from inetd, which it can either be root or the exim uid, if one is configured).
3693
3694 There is a private mechanism for bypassing some of this, in order to make it
3695 possible to test lots of configurations automatically, without having either to
3696 recompile each time, or to patch in an actual configuration file name and other
3697 values (such as the path name). If running in the test harness, pretend that
3698 configuration file changes and macro definitions haven't happened. */
3699
3700 if (( /* EITHER */
3701 (!f.trusted_config || /* Config changed, or */
3702 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3703 real_uid != root_uid && /* Not root, and */
3704 !f.running_in_test_harness /* Not fudged */
3705 ) || /* OR */
3706 expansion_test /* expansion testing */
3707 || /* OR */
3708 filter_test != FTEST_NONE) /* Filter testing */
3709 {
3710 setgroups(group_count, group_list);
3711 exim_setugid(real_uid, real_gid, FALSE,
3712 US"-C, -D, -be or -bf forces real uid");
3713 removed_privilege = TRUE;
3714
3715 /* In the normal case when Exim is called like this, stderr is available
3716 and should be used for any logging information because attempts to write
3717 to the log will usually fail. To arrange this, we unset really_exim. However,
3718 if no stderr is available there is no point - we might as well have a go
3719 at the log (if it fails, syslog will be written).
3720
3721 Note that if the invoker is Exim, the logs remain available. Messing with
3722 this causes unlogged successful deliveries. */
3723
3724 if (log_stderr && real_uid != exim_uid)
3725 f.really_exim = FALSE;
3726 }
3727
3728 /* Privilege is to be retained for the moment. It may be dropped later,
3729 depending on the job that this Exim process has been asked to do. For now, set
3730 the real uid to the effective so that subsequent re-execs of Exim are done by a
3731 privileged user. */
3732
3733 else
3734 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3735
3736 /* If testing a filter, open the file(s) now, before wasting time doing other
3737 setups and reading the message. */
3738
3739 if (filter_test & FTEST_SYSTEM)
3740 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3741 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3742 strerror(errno));
3743
3744 if (filter_test & FTEST_USER)
3745 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3746 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3747 strerror(errno));
3748
3749 /* Initialise lookup_list
3750 If debugging, already called above via version reporting.
3751 In either case, we initialise the list of available lookups while running
3752 as root. All dynamically modules are loaded from a directory which is
3753 hard-coded into the binary and is code which, if not a module, would be
3754 part of Exim already. Ability to modify the content of the directory
3755 is equivalent to the ability to modify a setuid binary!
3756
3757 This needs to happen before we read the main configuration. */
3758 init_lookup_list();
3759
3760 #ifdef SUPPORT_I18N
3761 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3762 #endif
3763
3764 /* Read the main runtime configuration data; this gives up if there
3765 is a failure. It leaves the configuration file open so that the subsequent
3766 configuration data for delivery can be read if needed.
3767
3768 NOTE: immediately after opening the configuration file we change the working
3769 directory to "/"! Later we change to $spool_directory. We do it there, because
3770 during readconf_main() some expansion takes place already. */
3771
3772 /* Store the initial cwd before we change directories. Can be NULL if the
3773 dir has already been unlinked. */
3774 initial_cwd = os_getcwd(NULL, 0);
3775
3776 /* checking:
3777 -be[m] expansion test -
3778 -b[fF] filter test new
3779 -bh[c] host test -
3780 -bmalware malware_test_file new
3781 -brt retry test new
3782 -brw rewrite test new
3783 -bt address test -
3784 -bv[s] address verify -
3785 list_options:
3786 -bP <option> (except -bP config, which sets list_config)
3787
3788 If any of these options is set, we suppress warnings about configuration
3789 issues (currently about tls_advertise_hosts and keep_environment not being
3790 defined) */
3791
3792 {
3793 #ifdef MEASURE_TIMING
3794 struct timeval t0, diff;
3795 (void)gettimeofday(&t0, NULL);
3796 #endif
3797
3798 readconf_main(checking || list_options);
3799
3800 #ifdef MEASURE_TIMING
3801 report_time_since(&t0, US"readconf_main (delta)");
3802 #endif
3803 }
3804
3805
3806 /* Now in directory "/" */
3807
3808 if (cleanup_environment() == FALSE)
3809 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
3810
3811
3812 /* If an action on specific messages is requested, or if a daemon or queue
3813 runner is being started, we need to know if Exim was called by an admin user.
3814 This is the case if the real user is root or exim, or if the real group is
3815 exim, or if one of the supplementary groups is exim or a group listed in
3816 admin_groups. We don't fail all message actions immediately if not admin_user,
3817 since some actions can be performed by non-admin users. Instead, set admin_user
3818 for later interrogation. */
3819
3820 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3821 f.admin_user = TRUE;
3822 else
3823 for (int i = 0; i < group_count && !f.admin_user; i++)
3824 if (group_list[i] == exim_gid)
3825 f.admin_user = TRUE;
3826 else if (admin_groups)
3827 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
3828 if (admin_groups[j] == group_list[i])
3829 f.admin_user = TRUE;
3830
3831 /* Another group of privileged users are the trusted users. These are root,
3832 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3833 are permitted to specify sender_addresses with -f on the command line, and
3834 other message parameters as well. */
3835
3836 if (real_uid == root_uid || real_uid == exim_uid)
3837 f.trusted_caller = TRUE;
3838 else
3839 {
3840 if (trusted_users)
3841 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
3842 if (trusted_users[i] == real_uid)
3843 f.trusted_caller = TRUE;
3844
3845 if (trusted_groups)
3846 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
3847 if (trusted_groups[i] == real_gid)
3848 f.trusted_caller = TRUE;
3849 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
3850 if (trusted_groups[i] == group_list[j])
3851 f.trusted_caller = TRUE;
3852 }
3853
3854 /* At this point, we know if the user is privileged and some command-line
3855 options become possibly impermissible, depending upon the configuration file. */
3856
3857 if (checking && commandline_checks_require_admin && !f.admin_user)
3858 exim_fail("exim: those command-line flags are set to require admin\n");
3859
3860 /* Handle the decoding of logging options. */
3861
3862 decode_bits(log_selector, log_selector_size, log_notall,
3863 log_selector_string, log_options, log_options_count, US"log", 0);
3864
3865 DEBUG(D_any)
3866 {
3867 debug_printf("configuration file is %s\n", config_main_filename);
3868 debug_printf("log selectors =");
3869 for (int i = 0; i < log_selector_size; i++)
3870 debug_printf(" %08x", log_selector[i]);
3871 debug_printf("\n");
3872 }
3873
3874 /* If domain literals are not allowed, check the sender address that was
3875 supplied with -f. Ditto for a stripped trailing dot. */
3876
3877 if (sender_address)
3878 {
3879 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3880 exim_fail("exim: bad -f address \"%s\": domain literals not "
3881 "allowed\n", sender_address);
3882 if (f_end_dot && !strip_trailing_dot)
3883 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
3884 "(trailing dot not allowed)\n", sender_address);
3885 }
3886
3887 /* See if an admin user overrode our logging. */
3888
3889 if (cmdline_syslog_name)
3890 if (f.admin_user)
3891 {
3892 syslog_processname = cmdline_syslog_name;
3893 log_file_path = string_copy(CUS"syslog");
3894 }
3895 else
3896 /* not a panic, non-privileged users should not be able to spam paniclog */
3897 exim_fail(
3898 "exim: you lack sufficient privilege to specify syslog process name\n");
3899
3900 /* Paranoia check of maximum lengths of certain strings. There is a check
3901 on the length of the log file path in log.c, which will come into effect
3902 if there are any calls to write the log earlier than this. However, if we
3903 get this far but the string is very long, it is better to stop now than to
3904 carry on and (e.g.) receive a message and then have to collapse. The call to
3905 log_write() from here will cause the ultimate panic collapse if the complete
3906 file name exceeds the buffer length. */
3907
3908 if (Ustrlen(log_file_path) > 200)
3909 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3910 "log_file_path is longer than 200 chars: aborting");
3911
3912 if (Ustrlen(pid_file_path) > 200)
3913 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3914 "pid_file_path is longer than 200 chars: aborting");
3915
3916 if (Ustrlen(spool_directory) > 200)
3917 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3918 "spool_directory is longer than 200 chars: aborting");
3919
3920 /* Length check on the process name given to syslog for its TAG field,
3921 which is only permitted to be 32 characters or less. See RFC 3164. */
3922
3923 if (Ustrlen(syslog_processname) > 32)
3924 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3925 "syslog_processname is longer than 32 chars: aborting");
3926
3927 if (log_oneline)
3928 if (f.admin_user)
3929 {
3930 log_write(0, LOG_MAIN, "%s", log_oneline);
3931 return EXIT_SUCCESS;
3932 }
3933 else
3934 return EXIT_FAILURE;
3935
3936 /* In some operating systems, the environment variable TMPDIR controls where
3937 temporary files are created; Exim doesn't use these (apart from when delivering
3938 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3939 If TMPDIR is found in the environment, reset it to the value defined in the
3940 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
3941 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
3942 EXIM_TMPDIR by the build scripts.
3943 */
3944
3945 #ifdef EXIM_TMPDIR
3946 if (environ) for (uschar ** p = USS environ; *p; p++)
3947 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
3948 {
3949 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
3950 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
3951 *p = newp;
3952 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
3953 }
3954 #endif
3955
3956 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3957 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3958 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3959 called by a user who has set the TZ variable. This then affects the timestamps
3960 in log files and in Received: headers, and any created Date: header lines. The
3961 required timezone is settable in the configuration file, so nothing can be done
3962 about this earlier - but hopefully nothing will normally be logged earlier than
3963 this. We have to make a new environment if TZ is wrong, but don't bother if
3964 timestamps_utc is set, because then all times are in UTC anyway. */
3965
3966 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
3967 f.timestamps_utc = TRUE;
3968 else
3969 {
3970 uschar *envtz = US getenv("TZ");
3971 if (envtz
3972 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
3973 : timezone_string != NULL
3974 )
3975 {
3976 uschar **p = USS environ;
3977 uschar **new;
3978 uschar **newp;
3979 int count = 0;
3980 if (environ) while (*p++) count++;
3981 if (!envtz) count++;
3982 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
3983 if (environ) for (p = USS environ; *p; p++)
3984 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
3985 if (timezone_string)
3986 {
3987 *newp = store_malloc(Ustrlen(timezone_string) + 4);
3988 sprintf(CS *newp++, "TZ=%s", timezone_string);
3989 }
3990 *newp = NULL;
3991 environ = CSS new;
3992 tzset();
3993 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3994 tod_stamp(tod_log));
3995 }
3996 }
3997
3998 /* Handle the case when we have removed the setuid privilege because of -C or
3999 -D. This means that the caller of Exim was not root.
4000
4001 There is a problem if we were running as the Exim user. The sysadmin may
4002 expect this case to retain privilege because "the binary was called by the
4003 Exim user", but it hasn't, because either the -D option set macros, or the
4004 -C option set a non-trusted configuration file. There are two possibilities:
4005
4006 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4007 to do message deliveries. Thus, the fact that it is running as a
4008 non-privileged user is plausible, and might be wanted in some special
4009 configurations. However, really_exim will have been set false when
4010 privilege was dropped, to stop Exim trying to write to its normal log
4011 files. Therefore, re-enable normal log processing, assuming the sysadmin
4012 has set up the log directory correctly.
4013
4014 (2) If deliver_drop_privilege is not set, the configuration won't work as
4015 apparently intended, and so we log a panic message. In order to retain
4016 root for -C or -D, the caller must either be root or be invoking a
4017 trusted configuration file (when deliver_drop_privilege is false). */
4018
4019 if ( removed_privilege
4020 && (!f.trusted_config || opt_D_used)
4021 && real_uid == exim_uid)
4022 if (deliver_drop_privilege)
4023 f.really_exim = TRUE; /* let logging work normally */
4024 else
4025 log_write(0, LOG_MAIN|LOG_PANIC,
4026 "exim user lost privilege for using %s option",
4027 f.trusted_config? "-D" : "-C");
4028
4029 /* Start up Perl interpreter if Perl support is configured and there is a
4030 perl_startup option, and the configuration or the command line specifies
4031 initializing starting. Note that the global variables are actually called
4032 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4033
4034 #ifdef EXIM_PERL
4035 if (perl_start_option != 0)
4036 opt_perl_at_start = (perl_start_option > 0);
4037 if (opt_perl_at_start && opt_perl_startup != NULL)
4038 {
4039 uschar *errstr;
4040 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4041 if ((errstr = init_perl(opt_perl_startup)))
4042 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4043 opt_perl_started = TRUE;
4044 }
4045 #endif /* EXIM_PERL */
4046
4047 /* Log the arguments of the call if the configuration file said so. This is
4048 a debugging feature for finding out what arguments certain MUAs actually use.
4049 Don't attempt it if logging is disabled, or if listing variables or if
4050 verifying/testing addresses or expansions. */
4051
4052 if ( (debug_selector & D_any || LOGGING(arguments))
4053 && f.really_exim && !list_options && !checking)
4054 {
4055 uschar *p = big_buffer;
4056 Ustrcpy(p, US"cwd= (failed)");
4057
4058 if (!initial_cwd)
4059 p += 13;
4060 else
4061 {
4062 Ustrncpy(p + 4, initial_cwd, big_buffer_size-5);
4063 p += 4 + Ustrlen(initial_cwd);
4064 /* in case p is near the end and we don't provide enough space for
4065 * string_format to be willing to write. */
4066 *p = '\0';
4067 }
4068
4069 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4070 while (*p) p++;
4071 for (int i = 0; i < argc; i++)
4072 {
4073 int len = Ustrlen(argv[i]);
4074 const uschar *printing;
4075 uschar *quote;
4076 if (p + len + 8 >= big_buffer + big_buffer_size)
4077 {
4078 Ustrcpy(p, US" ...");
4079 log_write(0, LOG_MAIN, "%s", big_buffer);
4080 Ustrcpy(big_buffer, US"...");
4081 p = big_buffer + 3;
4082 }
4083 printing = string_printing(argv[i]);
4084 if (!*printing) quote = US"\"";