1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 - 2021 */
7 /* See the file NOTICE for conditions of use and distribution. */
10 /* The main function: entry point, initialization, and high-level control.
11 Also a few functions that don't naturally fit elsewhere. */
16 #if defined(__GLIBC__) && !defined(__UCLIBC__)
17 # include <gnu/libc-version.h>
21 # include <gnutls/gnutls.h>
22 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
31 extern void init_lookup_list(void);
35 /*************************************************
36 * Function interface to store functions *
37 *************************************************/
39 /* We need some real functions to pass to the PCRE regular expression library
40 for store allocation via Exim's store manager. The normal calls are actually
41 macros that pass over location information to make tracing easier. These
42 functions just interface to the standard macro calls. A good compiler will
43 optimize out the tail recursion and so not make them too expensive. */
46 function_store_malloc(PCRE2_SIZE size, void * tag)
48 return store_malloc((int)size);
52 function_store_free(void * block, void * tag)
54 /* At least some version of pcre2 pass a null pointer */
55 if (block) store_free(block);
61 /*************************************************
62 * Enums for cmdline interface *
63 *************************************************/
65 enum commandline_info { CMDINFO_NONE=0,
66 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
71 /*************************************************
72 * Compile regular expression and panic on fail *
73 *************************************************/
75 /* This function is called when failure to compile a regular expression leads
76 to a panic exit. In other cases, pcre_compile() is called directly. In many
77 cases where this function is used, the results of the compilation are to be
78 placed in long-lived store, so we temporarily reset the store management
79 functions that PCRE uses if the use_malloc flag is set.
82 pattern the pattern to compile
83 caseless TRUE if caseless matching is required
84 use_malloc TRUE if compile into malloc store
86 Returns: pointer to the compiled pattern
90 regex_must_compile(const uschar * pattern, BOOL caseless, BOOL use_malloc)
93 int options = caseless ? PCRE_COPT|PCRE2_CASELESS : PCRE_COPT;
94 const pcre2_code * yield;
96 pcre2_general_context * gctx;
97 pcre2_compile_context * cctx;
101 gctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
102 cctx = pcre2_compile_context_create(gctx);
107 if (!(yield = pcre2_compile((PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, options,
108 &err, &offset, cctx)))
111 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
112 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
113 "%s at offset %ld while compiling %s", errbuf, (long)offset, pattern);
118 pcre2_compile_context_free(cctx);
119 pcre2_general_context_free(gctx);
128 pcre_gen_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
129 pcre_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
130 pcre_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
136 /*************************************************
137 * Execute regular expression and set strings *
138 *************************************************/
140 /* This function runs a regular expression match, and sets up the pointers to
141 the matched substrings. The matched strings are copied so the lifetime of
142 the subject is not a problem.
145 re the compiled expression
146 subject the subject string
147 options additional PCRE options
148 setup if < 0 do full setup
149 if >= 0 setup from setup+1 onwards,
150 excluding the full matched string
152 Returns: TRUE if matched, or FALSE
156 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
158 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
159 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
160 PCRE_EOPT | options, md, pcre_mtc_ctx);
163 if ((yield = (res >= 0)))
165 res = pcre2_get_ovector_count(md);
166 expand_nmax = setup < 0 ? 0 : setup + 1;
167 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
170 pcre2_substring_get_bynumber(md, matchnum,
171 (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
172 expand_nlength[expand_nmax++] = (int)len;
176 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
179 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
180 debug_printf_indent("pcre2: %s\n", errbuf);
182 pcre2_match_data_free(md);
187 /* Check just for match with regex. Uses the common memory-handling.
191 subject string to be checked
192 slen length of subject; -1 for nul-terminated
193 rptr pointer for matched string, copied, or NULL
195 Return: TRUE for a match.
199 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
201 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
202 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
203 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
204 0, PCRE_EOPT, md, pcre_mtc_ctx);
205 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
209 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
215 /*************************************************
216 * Set up processing details *
217 *************************************************/
219 /* Save a text string for dumping when SIGUSR1 is received.
220 Do checks for overruns.
222 Arguments: format and arguments, as for printf()
227 set_process_info(const char *format, ...)
229 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
234 g = string_fmt_append(&gs, "%5d ", (int)getpid());
236 va_start(ap, format);
237 if (!string_vformat(g, 0, format, ap))
240 g = string_cat(&gs, US"**** string overflowed buffer ****");
242 g = string_catn(g, US"\n", 1);
243 string_from_gstring(g);
244 process_info_len = g->ptr;
245 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
249 /***********************************************
250 * Handler for SIGTERM *
251 ***********************************************/
254 term_handler(int sig)
260 /***********************************************
261 * Handler for SIGSEGV *
262 ***********************************************/
266 segv_handler(int sig, siginfo_t * info, void * uctx)
268 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
269 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
270 switch (info->si_code)
272 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
273 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
274 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
275 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
278 if (US info->si_addr < US 4096)
279 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
281 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
282 signal(SIGSEGV, SIG_DFL);
287 segv_handler(int sig)
289 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
290 signal(SIGSEGV, SIG_DFL);
296 /*************************************************
297 * Handler for SIGUSR1 *
298 *************************************************/
300 /* SIGUSR1 causes any exim process to write to the process log details of
301 what it is currently doing. It will only be used if the OS is capable of
302 setting up a handler that causes automatic restarting of any system call
303 that is in progress at the time.
305 This function takes care to be signal-safe.
307 Argument: the signal number (SIGUSR1)
312 usr1_handler(int sig)
316 os_restarting_signal(sig, usr1_handler);
318 if (!process_log_path) return;
319 fd = log_open_as_exim(process_log_path);
321 /* If we are neither exim nor root, or if we failed to create the log file,
322 give up. There is not much useful we can do with errors, since we don't want
323 to disrupt whatever is going on outside the signal handler. */
327 (void)write(fd, process_info, process_info_len);
333 /*************************************************
335 *************************************************/
337 /* This handler is enabled most of the time that Exim is running. The handler
338 doesn't actually get used unless alarm() has been called to set a timer, to
339 place a time limit on a system call of some kind. When the handler is run, it
342 There are some other SIGALRM handlers that are used in special cases when more
343 than just a flag setting is required; for example, when reading a message's
344 input. These are normally set up in the code module that uses them, and the
345 SIGALRM handler is reset to this one afterwards.
347 Argument: the signal value (SIGALRM)
352 sigalrm_handler(int sig)
355 os_non_restarting_signal(SIGALRM, sigalrm_handler);
360 /*************************************************
361 * Sleep for a fractional time interval *
362 *************************************************/
364 /* This function is called by millisleep() and exim_wait_tick() to wait for a
365 period of time that may include a fraction of a second. The coding is somewhat
366 tedious. We do not expect setitimer() ever to fail, but if it does, the process
367 will wait for ever, so we panic in this instance. (There was a case of this
368 when a bug in a function that calls milliwait() caused it to pass invalid data.
369 That's when I added the check. :-)
371 We assume it to be not worth sleeping for under 50us; this value will
372 require revisiting as hardware advances. This avoids the issue of
373 a zero-valued timer setting meaning "never fire".
375 Argument: an itimerval structure containing the interval
380 milliwait(struct itimerval *itval)
383 sigset_t old_sigmask;
384 int save_errno = errno;
386 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
388 (void)sigemptyset(&sigmask); /* Empty mask */
389 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
390 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
391 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
392 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
393 "setitimer() failed: %s", strerror(errno));
394 (void)sigfillset(&sigmask); /* All signals */
395 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
396 (void)sigsuspend(&sigmask); /* Until SIGALRM */
397 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
399 sigalrm_seen = FALSE;
405 /*************************************************
406 * Millisecond sleep function *
407 *************************************************/
409 /* The basic sleep() function has a granularity of 1 second, which is too rough
410 in some cases - for example, when using an increasing delay to slow down
413 Argument: number of millseconds
420 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
421 .it_value = {.tv_sec = msec/1000,
422 .tv_usec = (msec % 1000) * 1000}};
428 /*************************************************
429 * Compare microsecond times *
430 *************************************************/
437 Returns: -1, 0, or +1
441 exim_tvcmp(struct timeval *t1, struct timeval *t2)
443 if (t1->tv_sec > t2->tv_sec) return +1;
444 if (t1->tv_sec < t2->tv_sec) return -1;
445 if (t1->tv_usec > t2->tv_usec) return +1;
446 if (t1->tv_usec < t2->tv_usec) return -1;
453 /*************************************************
454 * Clock tick wait function *
455 *************************************************/
457 #ifdef _POSIX_MONOTONIC_CLOCK
458 # ifdef CLOCK_BOOTTIME
459 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
461 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
464 /* Amount EXIM_CLOCK is behind realtime, at startup. */
465 static struct timespec offset_ts;
468 exim_clock_init(void)
471 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
472 (void)gettimeofday(&tv, NULL);
473 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
474 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
475 if (offset_ts.tv_nsec >= 0) return;
477 offset_ts.tv_nsec += 1000*1000*1000;
483 exim_gettime(struct timeval * tv)
485 #ifdef _POSIX_MONOTONIC_CLOCK
486 struct timespec now_ts;
488 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
490 now_ts.tv_sec += offset_ts.tv_sec;
491 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
494 now_ts.tv_nsec -= 1000*1000*1000;
496 tv->tv_sec = now_ts.tv_sec;
497 tv->tv_usec = now_ts.tv_nsec / 1000;
501 (void)gettimeofday(tv, NULL);
505 /* Exim uses a time + a pid to generate a unique identifier in two places: its
506 message IDs, and in file names for maildir deliveries. Because some OS now
507 re-use pids within the same second, sub-second times are now being used.
508 However, for absolute certainty, we must ensure the clock has ticked before
509 allowing the relevant process to complete. At the time of implementation of
510 this code (February 2003), the speed of processors is such that the clock will
511 invariably have ticked already by the time a process has done its job. This
512 function prepares for the time when things are faster - and it also copes with
513 clocks that go backwards.
516 prev_tv A timeval which was used to create uniqueness; its usec field
517 has been rounded down to the value of the resolution.
518 We want to be sure the current time is greater than this.
519 On return, updated to current (rounded down).
520 resolution The resolution that was used to divide the microseconds
521 (1 for maildir, larger for message ids)
527 exim_wait_tick(struct timeval * prev_tv, int resolution)
529 struct timeval now_tv;
530 long int now_true_usec;
532 exim_gettime(&now_tv);
533 now_true_usec = now_tv.tv_usec;
534 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
536 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
538 struct itimerval itval;
539 itval.it_interval.tv_sec = 0;
540 itval.it_interval.tv_usec = 0;
541 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
542 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
544 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
545 negative value for the microseconds is possible only in the case when "now"
546 is more than a second less than "tgt". That means that itval.it_value.tv_sec
547 is greater than zero. The following correction is therefore safe. */
549 if (itval.it_value.tv_usec < 0)
551 itval.it_value.tv_usec += 1000000;
552 itval.it_value.tv_sec -= 1;
555 DEBUG(D_transport|D_receive)
557 if (!f.running_in_test_harness)
559 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
560 prev_tv->tv_sec, (long) prev_tv->tv_usec,
561 now_tv.tv_sec, (long) now_tv.tv_usec);
562 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
563 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
569 /* Be prapared to go around if the kernel does not implement subtick
570 granularity (GNU Hurd) */
572 exim_gettime(&now_tv);
573 now_true_usec = now_tv.tv_usec;
574 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
582 /*************************************************
583 * Call fopen() with umask 777 and adjust mode *
584 *************************************************/
586 /* Exim runs with umask(0) so that files created with open() have the mode that
587 is specified in the open() call. However, there are some files, typically in
588 the spool directory, that are created with fopen(). They end up world-writeable
589 if no precautions are taken. Although the spool directory is not accessible to
590 the world, this is an untidiness. So this is a wrapper function for fopen()
591 that sorts out the mode of the created file.
594 filename the file name
595 options the fopen() options
596 mode the required mode
598 Returns: the fopened FILE or NULL
602 modefopen(const uschar *filename, const char *options, mode_t mode)
604 mode_t saved_umask = umask(0777);
605 FILE *f = Ufopen(filename, options);
606 (void)umask(saved_umask);
607 if (f != NULL) (void)fchmod(fileno(f), mode);
612 /*************************************************
613 * Ensure stdin, stdout, and stderr exist *
614 *************************************************/
616 /* Some operating systems grumble if an exec() happens without a standard
617 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
618 file will be opened and will use these fd values, and then some other bit of
619 code will assume, for example, that it can write error messages to stderr.
620 This function ensures that fds 0, 1, and 2 are open if they do not already
621 exist, by connecting them to /dev/null.
623 This function is also used to ensure that std{in,out,err} exist at all times,
624 so that if any library that Exim calls tries to use them, it doesn't crash.
635 for (int i = 0; i <= 2; i++)
637 if (fstat(i, &statbuf) < 0 && errno == EBADF)
639 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
640 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
641 string_open_failed("/dev/null", NULL));
642 if (devnull != i) (void)dup2(devnull, i);
645 if (devnull > 2) (void)close(devnull);
651 /*************************************************
652 * Close unwanted file descriptors for delivery *
653 *************************************************/
655 /* This function is called from a new process that has been forked to deliver
656 an incoming message, either directly, or using exec.
658 We want any smtp input streams to be closed in this new process. However, it
659 has been observed that using fclose() here causes trouble. When reading in -bS
660 input, duplicate copies of messages have been seen. The files will be sharing a
661 file pointer with the parent process, and it seems that fclose() (at least on
662 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
663 least sometimes. Hence we go for closing the underlying file descriptors.
665 If TLS is active, we want to shut down the TLS library, but without molesting
666 the parent's SSL connection.
668 For delivery of a non-SMTP message, we want to close stdin and stdout (and
669 stderr unless debugging) because the calling process might have set them up as
670 pipes and be waiting for them to close before it waits for the submission
671 process to terminate. If they aren't closed, they hold up the calling process
672 until the initial delivery process finishes, which is not what we want.
674 Exception: We do want it for synchronous delivery!
676 And notwithstanding all the above, if D_resolver is set, implying resolver
677 debugging, leave stdout open, because that's where the resolver writes its
680 When we close stderr (which implies we've also closed stdout), we also get rid
681 of any controlling terminal.
693 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
695 (void)close(fileno(smtp_in));
696 (void)close(fileno(smtp_out));
701 (void)close(0); /* stdin */
702 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
703 if (debug_selector == 0) /* stderr */
705 if (!f.synchronous_delivery)
718 /*************************************************
720 *************************************************/
722 /* This function sets a new uid and gid permanently, optionally calling
723 initgroups() to set auxiliary groups. There are some special cases when running
724 Exim in unprivileged modes. In these situations the effective uid will not be
725 root; if we already have the right effective uid/gid, and don't need to
726 initialize any groups, leave things as they are.
731 igflag TRUE if initgroups() wanted
732 msg text to use in debugging output and failure log
734 Returns: nothing; bombs out on failure
738 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
740 uid_t euid = geteuid();
741 gid_t egid = getegid();
743 if (euid == root_uid || euid != uid || egid != gid || igflag)
745 /* At least one OS returns +1 for initgroups failure, so just check for
750 struct passwd *pw = getpwuid(uid);
752 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
753 "no passwd entry for uid=%ld", (long int)uid);
755 if (initgroups(pw->pw_name, gid) != 0)
756 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
757 (long int)uid, strerror(errno));
760 if (setgid(gid) < 0 || setuid(uid) < 0)
761 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
762 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
765 /* Debugging output included uid/gid and all groups */
769 int group_count, save_errno;
770 gid_t group_list[EXIM_GROUPLIST_SIZE];
771 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
772 (long int)geteuid(), (long int)getegid(), (long int)getpid());
773 group_count = getgroups(nelem(group_list), group_list);
775 debug_printf(" auxiliary group list:");
777 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
778 else if (group_count < 0)
779 debug_printf(" <error: %s>", strerror(save_errno));
780 else debug_printf(" <none>");
788 /*************************************************
790 *************************************************/
792 /* Exim exits via this function so that it always clears up any open
798 Returns: does not return
807 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
808 ">>>>>>>>>>>>>>>>\n",
809 (int)getpid(), process_purpose, rc);
815 exim_underbar_exit(int rc)
819 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
820 ">>>>>>>>>>>>>>>>\n",
821 (int)getpid(), process_purpose, rc);
827 /* Print error string, then die */
829 exim_fail(const char * fmt, ...)
833 vfprintf(stderr, fmt, ap);
837 /* fail if a length is too long */
839 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
841 if (itemlen <= maxlen)
843 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
844 itemlen, maxlen, description);
848 /* only pass through the string item back to the caller if it's short enough */
849 static inline const uschar *
850 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
852 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
856 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
857 of chown()/fchown(). See src/functions.h for more explanation */
859 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
861 int saved_errno = errno; /* from the preceeding chown call */
863 log_write(0, LOG_MAIN|LOG_PANIC,
864 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
865 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
866 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
868 /* I leave this here, commented, in case the "bug"(?) comes up again.
869 It is not an Exim bug, but we can provide a workaround.
875 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
877 if (buf.st_uid == owner && buf.st_gid == group) return 0;
878 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
880 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
888 /*************************************************
889 * Extract port from host address *
890 *************************************************/
892 /* Called to extract the port from the values given to -oMa and -oMi.
893 It also checks the syntax of the address, and terminates it before the
894 port data when a port is extracted.
897 address the address, with possible port on the end
899 Returns: the port, or zero if there isn't one
900 bombs out on a syntax error
904 check_port(uschar *address)
906 int port = host_address_extract_port(address);
907 if (string_is_ip_address(address, NULL) == 0)
908 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
914 /*************************************************
915 * Test/verify an address *
916 *************************************************/
918 /* This function is called by the -bv and -bt code. It extracts a working
919 address from a full RFC 822 address. This isn't really necessary per se, but it
920 has the effect of collapsing source routes.
924 flags flag bits for verify_address()
925 exit_value to be set for failures
931 test_address(uschar *s, int flags, int *exit_value)
933 int start, end, domain;
934 uschar *parse_error = NULL;
935 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
939 fprintf(stdout, "syntax error: %s\n", parse_error);
944 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
945 -1, -1, NULL, NULL, NULL);
946 if (rc == FAIL) *exit_value = 2;
947 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
953 /*************************************************
954 * Show supported features *
955 *************************************************/
958 show_string(BOOL is_stdout, gstring * g)
960 const uschar * s = string_from_gstring(g);
962 if (is_stdout) fputs(CCS s, stdout);
963 else debug_printf("%s", s);
968 show_db_version(gstring * g)
970 #ifdef DB_VERSION_STRING
973 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
974 g = string_fmt_append(g, " Runtime: %s\n",
975 db_version(NULL, NULL, NULL));
978 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
980 #elif defined(BTREEVERSION) && defined(HASHVERSION)
982 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
984 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
987 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
988 g = string_cat(g, US"Probably ndbm\n");
989 #elif defined(USE_TDB)
990 g = string_cat(g, US"Using tdb\n");
993 g = string_cat(g, US"Probably GDBM (native mode)\n");
995 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1002 /* This function is called for -bV/--version and for -d to output the optional
1003 features of the current Exim binary.
1005 Arguments: BOOL, true for stdout else debug channel
1010 show_whats_supported(BOOL is_stdout)
1012 rmark reset_point = store_mark();
1015 DEBUG(D_any) {} else g = show_db_version(g);
1017 g = string_cat(g, US"Support for:");
1018 #ifdef SUPPORT_CRYPTEQ
1019 g = string_cat(g, US" crypteq");
1022 g = string_cat(g, US" iconv()");
1025 g = string_cat(g, US" IPv6");
1027 #ifdef HAVE_SETCLASSRESOURCES
1028 g = string_cat(g, US" use_setclassresources");
1031 g = string_cat(g, US" PAM");
1034 g = string_cat(g, US" Perl");
1036 #ifdef EXPAND_DLFUNC
1037 g = string_cat(g, US" Expand_dlfunc");
1039 #ifdef USE_TCP_WRAPPERS
1040 g = string_cat(g, US" TCPwrappers");
1043 g = string_cat(g, US" GnuTLS");
1046 g = string_cat(g, US" OpenSSL");
1048 #ifndef DISABLE_TLS_RESUME
1049 g = string_cat(g, US" TLS_resume");
1051 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1052 g = string_cat(g, US" translate_ip_address");
1054 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1055 g = string_cat(g, US" move_frozen_messages");
1057 #ifdef WITH_CONTENT_SCAN
1058 g = string_cat(g, US" Content_Scanning");
1061 g = string_cat(g, US" DANE");
1063 #ifndef DISABLE_DKIM
1064 g = string_cat(g, US" DKIM");
1066 #ifdef SUPPORT_DMARC
1067 g = string_cat(g, US" DMARC");
1069 #ifndef DISABLE_DNSSEC
1070 g = string_cat(g, US" DNSSEC");
1072 #ifndef DISABLE_EVENT
1073 g = string_cat(g, US" Event");
1076 g = string_cat(g, US" I18N");
1078 #ifndef DISABLE_OCSP
1079 g = string_cat(g, US" OCSP");
1081 #ifndef DISABLE_PIPE_CONNECT
1082 g = string_cat(g, US" PIPECONNECT");
1084 #ifndef DISABLE_PRDR
1085 g = string_cat(g, US" PRDR");
1087 #ifdef SUPPORT_PROXY
1088 g = string_cat(g, US" PROXY");
1090 #ifndef DISABLE_QUEUE_RAMP
1091 g = string_cat(g, US" Queue_Ramp");
1093 #ifdef SUPPORT_SOCKS
1094 g = string_cat(g, US" SOCKS");
1097 g = string_cat(g, US" SPF");
1099 #if defined(SUPPORT_SRS)
1100 g = string_cat(g, US" SRS");
1104 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1106 #ifdef EXPERIMENTAL_ARC
1107 g = string_cat(g, US" Experimental_ARC");
1109 #ifdef EXPERIMENTAL_BRIGHTMAIL
1110 g = string_cat(g, US" Experimental_Brightmail");
1112 #ifdef EXPERIMENTAL_DCC
1113 g = string_cat(g, US" Experimental_DCC");
1115 #ifdef EXPERIMENTAL_DSN_INFO
1116 g = string_cat(g, US" Experimental_DSN_info");
1118 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1119 g = string_cat(g, US" Experimental_ESMTP_Limits");
1121 #ifdef EXPERIMENTAL_QUEUEFILE
1122 g = string_cat(g, US" Experimental_QUEUEFILE");
1124 g = string_cat(g, US"\n");
1126 g = string_cat(g, US"Lookups (built-in):");
1127 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1128 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1130 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1131 g = string_cat(g, US" cdb");
1133 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1134 g = string_cat(g, US" dbm dbmjz dbmnz");
1136 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1137 g = string_cat(g, US" dnsdb");
1139 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1140 g = string_cat(g, US" dsearch");
1142 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1143 g = string_cat(g, US" ibase");
1145 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1146 g = string_cat(g, US" json");
1148 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1149 g = string_cat(g, US" ldap ldapdn ldapm");
1152 g = string_cat(g, US" lmdb");
1154 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1155 g = string_cat(g, US" mysql");
1157 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1158 g = string_cat(g, US" nis nis0");
1160 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1161 g = string_cat(g, US" nisplus");
1163 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1164 g = string_cat(g, US" oracle");
1166 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1167 g = string_cat(g, US" passwd");
1169 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1170 g = string_cat(g, US" pgsql");
1172 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1173 g = string_cat(g, US" redis");
1175 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1176 g = string_cat(g, US" sqlite");
1178 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1179 g = string_cat(g, US" testdb");
1181 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1182 g = string_cat(g, US" whoson");
1184 g = string_cat(g, US"\n");
1186 g = auth_show_supported(g);
1187 g = route_show_supported(g);
1188 g = transport_show_supported(g);
1190 #ifdef WITH_CONTENT_SCAN
1191 g = malware_show_supported(g);
1193 show_string(is_stdout, g); g = NULL;
1195 if (fixed_never_users[0] > 0)
1198 g = string_cat(g, US"Fixed never_users: ");
1199 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1200 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1201 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1204 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1206 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1208 /* Everything else is details which are only worth reporting when debugging.
1209 Perhaps the tls_version_report should move into this too. */
1213 /* clang defines __GNUC__ (at least, for me) so test for it first */
1214 #if defined(__clang__)
1215 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1216 #elif defined(__GNUC__)
1217 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1221 "? unknown version ?"
1225 g = string_cat(g, US"Compiler: <unknown>\n");
1228 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1229 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1230 __GLIBC__, __GLIBC_MINOR__);
1231 if (__GLIBC_PREREQ(2, 1))
1232 g = string_fmt_append(g, " Runtime: %s\n",
1233 gnu_get_libc_version());
1236 g = show_db_version(g);
1239 g = tls_version_report(g);
1242 g = utf8_version_report(g);
1244 #ifdef SUPPORT_DMARC
1245 g = dmarc_version_report(g);
1248 g = spf_lib_version_report(g);
1251 show_string(is_stdout, g);
1254 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1255 if (authi->version_report)
1256 g = (*authi->version_report)(g);
1258 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1259 characters; unless it's an ancient version of PCRE in which case it
1261 #ifndef PCRE_PRERELEASE
1262 # define PCRE_PRERELEASE
1265 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1268 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1269 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1271 PCRE2_MAJOR, PCRE2_MINOR,
1272 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1276 #undef EXPAND_AND_QUOTE
1278 show_string(is_stdout, g);
1282 for (int i = 0; i < lookup_list_count; i++)
1283 if (lookup_list[i]->version_report)
1284 g = lookup_list[i]->version_report(g);
1285 show_string(is_stdout, g);
1288 #ifdef WHITELIST_D_MACROS
1289 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1291 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1293 #ifdef TRUSTED_CONFIG_LIST
1294 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1296 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1300 show_string(is_stdout, g);
1301 store_reset(reset_point);
1305 /*************************************************
1306 * Show auxiliary information about Exim *
1307 *************************************************/
1310 show_exim_information(enum commandline_info request, FILE *stream)
1315 fprintf(stream, "Oops, something went wrong.\n");
1319 "The -bI: flag takes a string indicating which information to provide.\n"
1320 "If the string is not recognised, you'll get this help (on stderr).\n"
1322 " exim -bI:help this information\n"
1323 " exim -bI:dscp list of known dscp value keywords\n"
1324 " exim -bI:sieve list of supported sieve extensions\n"
1328 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1329 fprintf(stream, "%s\n", *pp);
1332 dscp_list_to_stream(stream);
1338 /*************************************************
1339 * Quote a local part *
1340 *************************************************/
1342 /* This function is used when a sender address or a From: or Sender: header
1343 line is being created from the caller's login, or from an authenticated_id. It
1344 applies appropriate quoting rules for a local part.
1346 Argument: the local part
1347 Returns: the local part, quoted if necessary
1351 local_part_quote(uschar *lpart)
1353 BOOL needs_quote = FALSE;
1356 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1358 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1359 (*t != '.' || t == lpart || t[1] == 0);
1362 if (!needs_quote) return lpart;
1364 g = string_catn(NULL, US"\"", 1);
1368 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1371 g = string_cat(g, lpart);
1374 g = string_catn(g, lpart, nq - lpart);
1375 g = string_catn(g, US"\\", 1);
1376 g = string_catn(g, nq, 1);
1380 g = string_catn(g, US"\"", 1);
1381 return string_from_gstring(g);
1387 /*************************************************
1388 * Load readline() functions *
1389 *************************************************/
1391 /* This function is called from testing executions that read data from stdin,
1392 but only when running as the calling user. Currently, only -be does this. The
1393 function loads the readline() function library and passes back the functions.
1394 On some systems, it needs the curses library, so load that too, but try without
1395 it if loading fails. All this functionality has to be requested at build time.
1398 fn_readline_ptr pointer to where to put the readline pointer
1399 fn_addhist_ptr pointer to where to put the addhistory function
1401 Returns: the dlopen handle or NULL on failure
1405 set_readline(char * (**fn_readline_ptr)(const char *),
1406 void (**fn_addhist_ptr)(const char *))
1409 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1411 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1412 if (dlhandle_curses) dlclose(dlhandle_curses);
1416 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1417 * char * readline (const char *prompt);
1418 * void add_history (const char *string);
1420 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1421 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1424 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1432 /*************************************************
1433 * Get a line from stdin for testing things *
1434 *************************************************/
1436 /* This function is called when running tests that can take a number of lines
1437 of input (for example, -be and -bt). It handles continuations and trailing
1438 spaces. And prompting and a blank line output on eof. If readline() is in use,
1439 the arguments are non-NULL and provide the relevant functions.
1442 fn_readline readline function or NULL
1443 fn_addhist addhist function or NULL
1445 Returns: pointer to dynamic memory, or NULL at end of file
1449 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1452 BOOL had_input = FALSE;
1454 if (!fn_readline) { printf("> "); fflush(stdout); }
1456 for (int i = 0;; i++)
1458 uschar buffer[1024];
1462 char *readline_line = NULL;
1465 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1466 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1467 p = US readline_line;
1472 /* readline() not in use */
1475 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1479 /* Handle the line */
1482 ss = p + Ustrlen(p);
1483 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1486 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1488 g = string_catn(g, p, ss - p);
1491 if (fn_readline) free(readline_line);
1494 /* g can only be NULL if ss==p */
1495 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1498 --g->ptr; /* drop the \ */
1501 if (had_input) return g ? string_from_gstring(g) : US"";
1508 /*************************************************
1509 * Output usage information for the program *
1510 *************************************************/
1512 /* This function is called when there are no recipients
1513 or a specific --help argument was added.
1516 progname information on what name we were called by
1518 Returns: DOES NOT RETURN
1522 exim_usage(uschar *progname)
1525 /* Handle specific program invocation variants */
1526 if (Ustrcmp(progname, US"-mailq") == 0)
1528 "mailq - list the contents of the mail queue\n\n"
1529 "For a list of options, see the Exim documentation.\n");
1531 /* Generic usage - we output this whatever happens */
1533 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1534 "not directly from a shell command line. Options and/or arguments control\n"
1535 "what it does when called. For a list of options, see the Exim documentation.\n");
1540 /*************************************************
1541 * Validate that the macros given are okay *
1542 *************************************************/
1544 /* Typically, Exim will drop privileges if macros are supplied. In some
1545 cases, we want to not do so.
1547 Arguments: opt_D_used - true if the commandline had a "-D" option
1548 Returns: true if trusted, false otherwise
1552 macros_trusted(BOOL opt_D_used)
1554 #ifdef WHITELIST_D_MACROS
1555 uschar *whitelisted, *end, *p, **whites;
1556 int white_count, i, n;
1558 BOOL prev_char_item, found;
1563 #ifndef WHITELIST_D_MACROS
1567 /* We only trust -D overrides for some invoking users:
1568 root, the exim run-time user, the optional config owner user.
1569 I don't know why config-owner would be needed, but since they can own the
1570 config files anyway, there's no security risk to letting them override -D. */
1571 if ( ! ((real_uid == root_uid)
1572 || (real_uid == exim_uid)
1573 #ifdef CONFIGURE_OWNER
1574 || (real_uid == config_uid)
1578 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1582 /* Get a list of macros which are whitelisted */
1583 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1584 prev_char_item = FALSE;
1586 for (p = whitelisted; *p != '\0'; ++p)
1588 if (*p == ':' || isspace(*p))
1593 prev_char_item = FALSE;
1596 if (!prev_char_item)
1597 prev_char_item = TRUE;
1604 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1605 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1610 if (i == white_count)
1612 while (*p != '\0' && p < end)
1618 /* The list of commandline macros should be very short.
1619 Accept the N*M complexity. */
1620 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1623 for (uschar ** w = whites; *w; ++w)
1624 if (Ustrcmp(*w, m->name) == 0)
1631 if (!m->replacement)
1633 if ((len = m->replen) == 0)
1635 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1638 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1644 /*************************************************
1645 * Expansion testing *
1646 *************************************************/
1648 /* Expand and print one item, doing macro-processing.
1651 item line for expansion
1655 expansion_test_line(const uschar * line)
1661 Ustrncpy(big_buffer, line, big_buffer_size);
1662 big_buffer[big_buffer_size-1] = '\0';
1663 len = Ustrlen(big_buffer);
1665 (void) macros_expand(0, &len, &dummy_macexp);
1667 if (isupper(big_buffer[0]))
1669 if (macro_read_assignment(big_buffer))
1670 printf("Defined macro '%s'\n", mlast->name);
1673 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1674 else printf("Failed: %s\n", expand_string_message);
1679 /*************************************************
1680 * Entry point and high-level code *
1681 *************************************************/
1683 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1684 the appropriate action. All the necessary functions are present in the one
1685 binary. I originally thought one should split it up, but it turns out that so
1686 much of the apparatus is needed in each chunk that one might as well just have
1687 it all available all the time, which then makes the coding easier as well.
1690 argc count of entries in argv
1691 argv argument strings, with argv[0] being the program name
1693 Returns: EXIT_SUCCESS if terminated successfully
1694 EXIT_FAILURE otherwise, except when a message has been sent
1695 to the sender, and -oee was given
1699 main(int argc, char **cargv)
1701 uschar **argv = USS cargv;
1702 int arg_receive_timeout = -1;
1703 int arg_smtp_receive_timeout = -1;
1704 int arg_error_handling = error_handling;
1705 int filter_sfd = -1;
1706 int filter_ufd = -1;
1709 int list_queue_option = 0;
1711 int msg_action_arg = -1;
1712 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1713 int queue_only_reason = 0;
1715 int perl_start_option = 0;
1717 int recipients_arg = argc;
1718 int sender_address_domain = 0;
1719 int test_retry_arg = -1;
1720 int test_rewrite_arg = -1;
1721 gid_t original_egid;
1722 BOOL arg_queue_only = FALSE;
1723 BOOL bi_option = FALSE;
1724 BOOL checking = FALSE;
1725 BOOL count_queue = FALSE;
1726 BOOL expansion_test = FALSE;
1727 BOOL extract_recipients = FALSE;
1728 BOOL flag_G = FALSE;
1729 BOOL flag_n = FALSE;
1730 BOOL forced_delivery = FALSE;
1731 BOOL f_end_dot = FALSE;
1732 BOOL deliver_give_up = FALSE;
1733 BOOL list_queue = FALSE;
1734 BOOL list_options = FALSE;
1735 BOOL list_config = FALSE;
1736 BOOL local_queue_only;
1737 BOOL one_msg_action = FALSE;
1738 BOOL opt_D_used = FALSE;
1739 BOOL queue_only_set = FALSE;
1740 BOOL receiving_message = TRUE;
1741 BOOL sender_ident_set = FALSE;
1742 BOOL session_local_queue_only;
1744 BOOL removed_privilege = FALSE;
1745 BOOL usage_wanted = FALSE;
1746 BOOL verify_address_mode = FALSE;
1747 BOOL verify_as_sender = FALSE;
1748 BOOL rcpt_verify_quota = FALSE;
1749 BOOL version_printed = FALSE;
1750 uschar *alias_arg = NULL;
1751 uschar *called_as = US"";
1752 uschar *cmdline_syslog_name = NULL;
1753 uschar *start_queue_run_id = NULL;
1754 uschar *stop_queue_run_id = NULL;
1755 uschar *expansion_test_message = NULL;
1756 const uschar *ftest_domain = NULL;
1757 const uschar *ftest_localpart = NULL;
1758 const uschar *ftest_prefix = NULL;
1759 const uschar *ftest_suffix = NULL;
1760 uschar *log_oneline = NULL;
1761 uschar *malware_test_file = NULL;
1762 uschar *real_sender_address;
1763 uschar *originator_home = US"/";
1767 struct stat statbuf;
1768 pid_t passed_qr_pid = (pid_t)0;
1769 int passed_qr_pipe = -1;
1770 gid_t group_list[EXIM_GROUPLIST_SIZE];
1772 /* For the -bI: flag */
1773 enum commandline_info info_flag = CMDINFO_NONE;
1774 BOOL info_stdout = FALSE;
1776 /* Possible options for -R and -S */
1778 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1780 /* Need to define this in case we need to change the environment in order
1781 to get rid of a bogus time zone. We have to make it char rather than uschar
1782 because some OS define it in /usr/include/unistd.h. */
1784 extern char **environ;
1786 #ifdef MEASURE_TIMING
1787 (void)gettimeofday(×tamp_startup, NULL);
1790 store_init(); /* Initialise the memory allocation susbsystem */
1791 pcre_init(); /* Set up memory handling for pcre */
1793 /* If the Exim user and/or group and/or the configuration file owner/group were
1794 defined by ref:name at build time, we must now find the actual uid/gid values.
1795 This is a feature to make the lives of binary distributors easier. */
1797 #ifdef EXIM_USERNAME
1798 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1801 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1803 /* If ref:name uses a number as the name, route_finduser() returns
1804 TRUE with exim_uid set and pw coerced to NULL. */
1806 exim_gid = pw->pw_gid;
1807 #ifndef EXIM_GROUPNAME
1810 "exim: ref:name should specify a usercode, not a group.\n"
1811 "exim: can't let you get away with it unless you also specify a group.\n");
1815 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1818 #ifdef EXIM_GROUPNAME
1819 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1820 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1823 #ifdef CONFIGURE_OWNERNAME
1824 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1825 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1826 CONFIGURE_OWNERNAME);
1829 /* We default the system_filter_user to be the Exim run-time user, as a
1830 sane non-root value. */
1831 system_filter_uid = exim_uid;
1833 #ifdef CONFIGURE_GROUPNAME
1834 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1835 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1836 CONFIGURE_GROUPNAME);
1839 /* In the Cygwin environment, some initialization used to need doing.
1840 It was fudged in by means of this macro; now no longer but we'll leave
1841 it in case of others. */
1847 /* Check a field which is patched when we are running Exim within its
1848 testing harness; do a fast initial check, and then the whole thing. */
1850 f.running_in_test_harness =
1851 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1852 if (f.running_in_test_harness)
1855 /* Protect against abusive argv[0] */
1856 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1857 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1859 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1860 at the start of a program; however, it seems that some environments do not
1861 follow this. A "strange" locale can affect the formatting of timestamps, so we
1864 setlocale(LC_ALL, "C");
1866 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1868 #ifdef _POSIX_MONOTONIC_CLOCK
1872 /* Set up the default handler for timing using alarm(). */
1874 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1876 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1877 because store_malloc writes a log entry on failure. */
1879 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1880 exim_fail("exim: failed to get store for log buffer\n");
1882 /* Initialize the default log options. */
1884 bits_set(log_selector, log_selector_size, log_default);
1886 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1887 NULL when the daemon is run and the file is closed. We have to use this
1888 indirection, because some systems don't allow writing to the variable "stderr".
1891 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1893 /* Ensure there is a big buffer for temporary use in several places. It is put
1894 in malloc store so that it can be freed for enlargement if necessary. */
1896 big_buffer = store_malloc(big_buffer_size);
1898 /* Set up the handler for the data request signal, and set the initial
1899 descriptive text. */
1901 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1902 set_process_info("initializing");
1903 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1906 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1907 sigaction(SIGSEGV, &act, NULL);
1910 signal(SIGSEGV, segv_handler); /* log faults */
1913 /* If running in a dockerized environment, the TERM signal is only
1914 delegated to the PID 1 if we request it by setting an signal handler */
1915 if (getpid() == 1) signal(SIGTERM, term_handler);
1917 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1918 in the daemon code. For the rest of Exim's uses, we ignore it. */
1920 signal(SIGHUP, SIG_IGN);
1922 /* We don't want to die on pipe errors as the code is written to handle
1923 the write error instead. */
1925 signal(SIGPIPE, SIG_IGN);
1927 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1928 set to SIG_IGN. This causes subprocesses that complete before the parent
1929 process waits for them not to hang around, so when Exim calls wait(), nothing
1930 is there. The wait() code has been made robust against this, but let's ensure
1931 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1932 ending status. We use sigaction rather than plain signal() on those OS where
1933 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1934 problem on AIX with this.) */
1938 struct sigaction act;
1939 act.sa_handler = SIG_DFL;
1940 sigemptyset(&(act.sa_mask));
1942 sigaction(SIGCHLD, &act, NULL);
1945 signal(SIGCHLD, SIG_DFL);
1948 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1953 /* Set up the version number. Set up the leading 'E' for the external form of
1954 message ids, set the pointer to the internal form, and initialize it to
1955 indicate no message being processed. */
1958 message_id_option[0] = '-';
1959 message_id_external = message_id_option + 1;
1960 message_id_external[0] = 'E';
1961 message_id = message_id_external + 1;
1964 /* Set the umask to zero so that any files Exim creates using open() are
1965 created with the modes that it specifies. NOTE: Files created with fopen() have
1966 a problem, which was not recognized till rather late (February 2006). With this
1967 umask, such files will be world writeable. (They are all content scanning files
1968 in the spool directory, which isn't world-accessible, so this is not a
1969 disaster, but it's untidy.) I don't want to change this overall setting,
1970 however, because it will interact badly with the open() calls. Instead, there's
1971 now a function called modefopen() that fiddles with the umask while calling
1976 /* Precompile the regular expression for matching a message id. Keep this in
1977 step with the code that generates ids in the accept.c module. We need to do
1978 this here, because the -M options check their arguments for syntactic validity
1979 using mac_ismsgid, which uses this. */
1982 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1984 /* Precompile the regular expression that is used for matching an SMTP error
1985 code, possibly extended, at the start of an error message. Note that the
1986 terminating whitespace character is included. */
1989 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1992 #ifdef WHITELIST_D_MACROS
1993 /* Precompile the regular expression used to filter the content of macros
1994 given to -D for permissibility. */
1996 regex_whitelisted_macro =
1997 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
2000 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
2002 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2003 this seems to be a generally accepted convention, since one finds symbolic
2004 links called "mailq" in standard OS configurations. */
2006 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2007 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2010 receiving_message = FALSE;
2011 called_as = US"-mailq";
2014 /* If the program is called as "rmail" treat it as equivalent to
2015 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2016 i.e. preventing a single dot on a line from terminating the message, and
2017 returning with zero return code, even in cases of error (provided an error
2018 message has been sent). */
2020 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2021 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2024 called_as = US"-rmail";
2025 errors_sender_rc = EXIT_SUCCESS;
2028 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2029 this is a smail convention. */
2031 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2032 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2034 smtp_input = smtp_batched_input = TRUE;
2035 called_as = US"-rsmtp";
2038 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2039 this is a smail convention. */
2041 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2042 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2045 receiving_message = FALSE;
2046 called_as = US"-runq";
2049 /* If the program is called as "newaliases" treat it as equivalent to
2050 "exim -bi"; this is a sendmail convention. */
2052 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2053 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2056 receiving_message = FALSE;
2057 called_as = US"-newaliases";
2060 /* Save the original effective uid for a couple of uses later. It should
2061 normally be root, but in some esoteric environments it may not be. */
2063 original_euid = geteuid();
2064 original_egid = getegid();
2066 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2067 to be the same as the real ones. This makes a difference only if Exim is setuid
2068 (or setgid) to something other than root, which could be the case in some
2069 special configurations. */
2071 real_uid = getuid();
2072 real_gid = getgid();
2074 if (real_uid == root_uid)
2076 if ((rv = setgid(real_gid)))
2077 exim_fail("exim: setgid(%ld) failed: %s\n",
2078 (long int)real_gid, strerror(errno));
2079 if ((rv = setuid(real_uid)))
2080 exim_fail("exim: setuid(%ld) failed: %s\n",
2081 (long int)real_uid, strerror(errno));
2084 /* If neither the original real uid nor the original euid was root, Exim is
2085 running in an unprivileged state. */
2087 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2089 /* For most of the args-parsing we need to use permanent pool memory */
2091 int old_pool = store_pool;
2092 store_pool = POOL_PERM;
2094 /* Scan the program's arguments. Some can be dealt with right away; others are
2095 simply recorded for checking and handling afterwards. Do a high-level switch
2096 on the second character (the one after '-'), to save some effort. */
2098 for (i = 1; i < argc; i++)
2100 BOOL badarg = FALSE;
2101 uschar * arg = argv[i];
2105 /* An argument not starting with '-' is the start of a recipients list;
2106 break out of the options-scanning loop. */
2114 /* An option consisting of -- terminates the options */
2116 if (Ustrcmp(arg, "--") == 0)
2118 recipients_arg = i + 1;
2122 /* Handle flagged options */
2124 switchchar = arg[1];
2127 /* Make all -ex options synonymous with -oex arguments, since that
2128 is assumed by various callers. Also make -qR options synonymous with -R
2129 options, as that seems to be required as well. Allow for -qqR too, and
2130 the same for -S options. */
2132 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2133 Ustrncmp(arg+1, "qR", 2) == 0 ||
2134 Ustrncmp(arg+1, "qS", 2) == 0)
2136 switchchar = arg[2];
2139 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2141 switchchar = arg[3];
2143 f.queue_2stage = TRUE;
2146 /* Make -r synonymous with -f, since it is a documented alias */
2148 else if (arg[1] == 'r') switchchar = 'f';
2150 /* Make -ov synonymous with -v */
2152 else if (Ustrcmp(arg, "-ov") == 0)
2158 /* deal with --option_aliases */
2159 else if (switchchar == '-')
2161 if (Ustrcmp(argrest, "help") == 0)
2163 usage_wanted = TRUE;
2166 else if (Ustrcmp(argrest, "version") == 0)
2173 /* High-level switch on active initial letter */
2178 /* sendmail uses -Ac and -Am to control which .cf file is used;
2181 if (!*argrest) { badarg = TRUE; break; }
2184 BOOL ignore = FALSE;
2189 if (*(argrest + 1) == '\0')
2193 if (!ignore) badarg = TRUE;
2197 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2198 so has no need of it. */
2201 if (!*argrest) i++; /* Skip over the type */
2207 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2211 /* -bd: Run in daemon mode, awaiting SMTP connections.
2212 -bdf: Ditto, but in the foreground.
2215 f.daemon_listen = TRUE;
2216 if (*argrest == 'f') f.background_daemon = FALSE;
2217 else if (*argrest) badarg = TRUE;
2220 /* -be: Run in expansion test mode
2221 -bem: Ditto, but read a message from a file first
2224 expansion_test = checking = TRUE;
2225 if (*argrest == 'm')
2227 if (++i >= argc) { badarg = TRUE; break; }
2228 expansion_test_message = argv[i];
2231 if (*argrest) badarg = TRUE;
2234 /* -bF: Run system filter test */
2236 filter_test |= checking = FTEST_SYSTEM;
2237 if (*argrest) badarg = TRUE;
2238 else if (++i < argc) filter_test_sfile = argv[i];
2239 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2242 /* -bf: Run user filter test
2243 -bfd: Set domain for filter testing
2244 -bfl: Set local part for filter testing
2245 -bfp: Set prefix for filter testing
2246 -bfs: Set suffix for filter testing
2251 filter_test |= checking = FTEST_USER;
2252 if (++i < argc) filter_test_ufile = argv[i];
2253 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2258 exim_fail("exim: string expected after %s\n", arg);
2259 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2260 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2261 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2262 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2267 /* -bh: Host checking - an IP address must follow. */
2269 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2271 if (++i >= argc) { badarg = TRUE; break; }
2272 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2273 host_checking = checking = f.log_testing_mode = TRUE;
2274 f.host_checking_callout = *argrest == 'c';
2275 message_logs = FALSE;
2280 /* -bi: This option is used by sendmail to initialize *the* alias file,
2281 though it has the -oA option to specify a different file. Exim has no
2282 concept of *the* alias file, but since Sun's YP make script calls
2283 sendmail this way, some support must be provided. */
2285 if (!*argrest) bi_option = TRUE;
2289 /* -bI: provide information, of the type to follow after a colon.
2290 This is an Exim flag. */
2292 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2294 uschar *p = argrest+1;
2295 info_flag = CMDINFO_HELP;
2297 if (strcmpic(p, CUS"sieve") == 0)
2299 info_flag = CMDINFO_SIEVE;
2302 else if (strcmpic(p, CUS"dscp") == 0)
2304 info_flag = CMDINFO_DSCP;
2307 else if (strcmpic(p, CUS"help") == 0)
2313 /* -bm: Accept and deliver message - the default option. Reinstate
2314 receiving_message, which got turned off for all -b options.
2315 -bmalware: test the filename given for malware */
2317 if (!*argrest) receiving_message = TRUE;
2318 else if (Ustrcmp(argrest, "alware") == 0)
2320 if (++i >= argc) { badarg = TRUE; break; }
2322 malware_test_file = argv[i];
2327 /* -bnq: For locally originating messages, do not qualify unqualified
2328 addresses. In the envelope, this causes errors; in header lines they
2331 if (Ustrcmp(argrest, "q") == 0)
2333 f.allow_unqualified_sender = FALSE;
2334 f.allow_unqualified_recipient = FALSE;
2339 /* -bpxx: List the contents of the mail queue, in various forms. If
2340 the option is -bpc, just a queue count is needed. Otherwise, if the
2341 first letter after p is r, then order is random. */
2343 if (*argrest == 'c')
2346 if (*++argrest) badarg = TRUE;
2350 if (*argrest == 'r')
2352 list_queue_option = 8;
2355 else list_queue_option = 0;
2359 /* -bp: List the contents of the mail queue, top-level only */
2363 /* -bpu: List the contents of the mail queue, top-level undelivered */
2365 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2367 /* -bpa: List the contents of the mail queue, including all delivered */
2369 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2371 /* Unknown after -bp[r] */
2377 /* -bP: List the configuration variables given as the address list.
2378 Force -v, so configuration errors get displayed. */
2381 /* -bP config: we need to setup here, because later,
2382 when list_options is checked, the config is read already */
2385 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2388 readconf_save_config(version_string);
2392 list_options = TRUE;
2393 debug_selector |= D_v;
2394 debug_file = stderr;
2398 /* -brt: Test retry configuration lookup */
2400 if (Ustrcmp(argrest, "t") == 0)
2403 test_retry_arg = i + 1;
2407 /* -brw: Test rewrite configuration */
2409 else if (Ustrcmp(argrest, "w") == 0)
2412 test_rewrite_arg = i + 1;
2418 /* -bS: Read SMTP commands on standard input, but produce no replies -
2419 all errors are reported by sending messages. */
2422 smtp_input = smtp_batched_input = receiving_message = TRUE;
2426 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2427 on standard output. */
2429 if (!*argrest) smtp_input = receiving_message = TRUE;
2433 /* -bt: address testing mode */
2436 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2440 /* -bv: verify addresses */
2443 verify_address_mode = checking = f.log_testing_mode = TRUE;
2445 /* -bvs: verify sender addresses */
2447 else if (Ustrcmp(argrest, "s") == 0)
2449 verify_address_mode = checking = f.log_testing_mode = TRUE;
2450 verify_as_sender = TRUE;
2455 /* -bV: Print version string and support details */
2459 printf("Exim version %s #%s built %s\n", version_string,
2460 version_cnumber, version_date);
2461 printf("%s\n", CS version_copyright);
2462 version_printed = TRUE;
2463 show_whats_supported(TRUE);
2464 f.log_testing_mode = TRUE;
2469 /* -bw: inetd wait mode, accept a listening socket as stdin */
2471 f.inetd_wait_mode = TRUE;
2472 f.background_daemon = FALSE;
2473 f.daemon_listen = TRUE;
2475 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2476 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2487 /* -C: change configuration file list; ignore if it isn't really
2488 a change! Enforce a prefix check if required. */
2492 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2493 if (Ustrcmp(config_main_filelist, argrest) != 0)
2495 #ifdef ALT_CONFIG_PREFIX
2497 int len = Ustrlen(ALT_CONFIG_PREFIX);
2498 const uschar *list = argrest;
2500 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2501 while((filename = string_nextinlist(&list, &sep, big_buffer,
2503 if ( ( Ustrlen(filename) < len
2504 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2505 || Ustrstr(filename, "/../") != NULL
2507 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2509 exim_fail("-C Permission denied\n");
2511 if (real_uid != root_uid)
2513 #ifdef TRUSTED_CONFIG_LIST
2515 if (real_uid != exim_uid
2516 #ifdef CONFIGURE_OWNER
2517 && real_uid != config_uid
2520 f.trusted_config = FALSE;
2523 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2526 struct stat statbuf;
2528 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2529 (statbuf.st_uid != root_uid /* owner not root */
2530 #ifdef CONFIGURE_OWNER
2531 && statbuf.st_uid != config_uid /* owner not the special one */
2534 (statbuf.st_gid != root_gid /* group not root */
2535 #ifdef CONFIGURE_GROUP
2536 && statbuf.st_gid != config_gid /* group not the special one */
2538 && (statbuf.st_mode & 020) != 0 /* group writeable */
2540 (statbuf.st_mode & 2) != 0) /* world writeable */
2542 f.trusted_config = FALSE;
2547 /* Well, the trust list at least is up to scratch... */
2549 uschar *trusted_configs[32];
2552 int old_pool = store_pool;
2553 store_pool = POOL_MAIN;
2555 reset_point = store_mark();
2556 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2558 uschar *start = big_buffer, *nl;
2559 while (*start && isspace(*start))
2563 nl = Ustrchr(start, '\n');
2566 trusted_configs[nr_configs++] = string_copy(start);
2567 if (nr_configs == nelem(trusted_configs))
2575 const uschar *list = argrest;
2577 while (f.trusted_config && (filename = string_nextinlist(&list,
2578 &sep, big_buffer, big_buffer_size)))
2580 for (i=0; i < nr_configs; i++)
2581 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2583 if (i == nr_configs)
2585 f.trusted_config = FALSE;
2590 else /* No valid prefixes found in trust_list file. */
2591 f.trusted_config = FALSE;
2592 store_reset(reset_point);
2593 store_pool = old_pool;
2596 else /* Could not open trust_list file. */
2597 f.trusted_config = FALSE;
2600 /* Not root; don't trust config */
2601 f.trusted_config = FALSE;
2605 config_main_filelist = argrest;
2606 f.config_changed = TRUE;
2611 /* -D: set up a macro definition */
2614 #ifdef DISABLE_D_OPTION
2615 exim_fail("exim: -D is not available in this Exim binary\n");
2621 uschar *s = argrest;
2624 while (isspace(*s)) s++;
2626 if (*s < 'A' || *s > 'Z')
2627 exim_fail("exim: macro name set by -D must start with "
2628 "an upper case letter\n");
2630 while (isalnum(*s) || *s == '_')
2632 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2636 if (ptr == 0) { badarg = TRUE; break; }
2637 while (isspace(*s)) s++;
2640 if (*s++ != '=') { badarg = TRUE; break; }
2641 while (isspace(*s)) s++;
2644 for (m = macros_user; m; m = m->next)
2645 if (Ustrcmp(m->name, name) == 0)
2646 exim_fail("exim: duplicated -D in command line\n");
2648 m = macro_create(name, s, TRUE);
2650 if (clmacro_count >= MAX_CLMACROS)
2651 exim_fail("exim: too many -D options on command line\n");
2652 clmacros[clmacro_count++] =
2653 string_sprintf("-D%s=%s", m->name, m->replacement);
2660 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2662 if (Ustrcmp(argrest, "ropcr") == 0)
2664 /* drop_cr = TRUE; */
2667 /* -dp: Set up a debug pretrigger buffer with given size. */
2669 else if (Ustrcmp(argrest, "p") == 0)
2673 debug_pretrigger_setup(argv[i]);
2675 /* -dt: Set a debug trigger selector */
2677 else if (Ustrncmp(argrest, "t=", 2) == 0)
2678 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2680 /* -d: Set debug level (see also -v below).
2681 If -dd is used, debugging subprocesses of the daemon is disabled. */
2685 /* Use an intermediate variable so that we don't set debugging while
2686 decoding the debugging bits. */
2688 unsigned int selector = D_default;
2691 if (*argrest == 'd')
2693 f.debug_daemon = TRUE;
2697 decode_bits(&selector, 1, debug_notall, argrest,
2698 debug_options, debug_options_count, US"debug", 0);
2699 debug_selector = selector;
2704 /* -E: This is a local error message. This option is not intended for
2705 external use at all, but is not restricted to trusted callers because it
2706 does no harm (just suppresses certain error messages) and if Exim is run
2707 not setuid root it won't always be trusted when it generates error
2708 messages using this option. If there is a message id following -E, point
2709 message_reference at it, for logging. */
2712 f.local_error_message = TRUE;
2713 if (mac_ismsgid(argrest)) message_reference = argrest;
2717 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2718 option, so it looks as if historically the -oex options are also callable
2719 without the leading -o. So we have to accept them. Before the switch,
2720 anything starting -oe has been converted to -e. Exim does not support all
2721 of the sendmail error options. */
2724 if (Ustrcmp(argrest, "e") == 0)
2726 arg_error_handling = ERRORS_SENDER;
2727 errors_sender_rc = EXIT_SUCCESS;
2729 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2730 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2731 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2732 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2737 /* -F: Set sender's full name, used instead of the gecos entry from
2738 the password file. Since users can usually alter their gecos entries,
2739 there's no security involved in using this instead. The data can follow
2740 the -F or be in the next argument. */
2744 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2745 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2746 f.sender_name_forced = TRUE;
2750 /* -f: Set sender's address - this value is only actually used if Exim is
2751 run by a trusted user, or if untrusted_set_sender is set and matches the
2752 address, except that the null address can always be set by any user. The
2753 test for this happens later, when the value given here is ignored when not
2754 permitted. For an untrusted user, the actual sender is still put in Sender:
2755 if it doesn't match the From: header (unless no_local_from_check is set).
2756 The data can follow the -f or be in the next argument. The -r switch is an
2757 obsolete form of -f but since there appear to be programs out there that
2758 use anything that sendmail has ever supported, better accept it - the
2759 synonymizing is done before the switch above.
2761 At this stage, we must allow domain literal addresses, because we don't
2762 know what the setting of allow_domain_literals is yet. Ditto for trailing
2763 dots and strip_trailing_dot. */
2767 int dummy_start, dummy_end;
2770 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2771 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2773 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2776 uschar * temp = argrest + Ustrlen(argrest) - 1;
2777 while (temp >= argrest && isspace(*temp)) temp--;
2778 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2779 allow_domain_literals = TRUE;
2780 strip_trailing_dot = TRUE;
2782 allow_utf8_domains = TRUE;
2784 if (!(sender_address = parse_extract_address(argrest, &errmess,
2785 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2786 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2788 sender_address = string_copy_taint(sender_address, TRUE);
2790 message_smtputf8 = string_is_utf8(sender_address);
2791 allow_utf8_domains = FALSE;
2793 allow_domain_literals = FALSE;
2794 strip_trailing_dot = FALSE;
2796 f.sender_address_forced = TRUE;
2800 /* -G: sendmail invocation to specify that it's a gateway submission and
2801 sendmail may complain about problems instead of fixing them.
2802 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2803 not at this time complain about problems. */
2809 /* -h: Set the hop count for an incoming message. Exim does not currently
2810 support this; it always computes it by counting the Received: headers.
2811 To put it in will require a change to the spool header file format. */
2815 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2816 if (!isdigit(*argrest)) badarg = TRUE;
2820 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2821 not to be documented for sendmail but mailx (at least) uses it) */
2824 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2828 /* -L: set the identifier used for syslog; equivalent to setting
2829 syslog_processname in the config file, but needs to be an admin option. */
2833 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2834 if ((sz = Ustrlen(argrest)) > 32)
2835 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2837 exim_fail("exim: the -L syslog name is too short\n");
2838 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2842 receiving_message = FALSE;
2844 /* -MC: continue delivery of another message via an existing open
2845 file descriptor. This option is used for an internal call by the
2846 smtp transport when there is a pending message waiting to go to an
2847 address to which it has got a connection. Five subsequent arguments are
2848 required: transport name, host name, IP address, sequence number, and
2849 message_id. Transports may decline to create new processes if the sequence
2850 number gets too big. The channel is stdin. This (-MC) must be the last
2851 argument. There's a subsequent check that the real-uid is privileged.
2853 If we are running in the test harness. delay for a bit, to let the process
2854 that set this one up complete. This makes for repeatability of the logging,
2857 if (Ustrcmp(argrest, "C") == 0)
2859 union sockaddr_46 interface_sock;
2860 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2863 exim_fail("exim: too many or too few arguments after -MC\n");
2865 if (msg_action_arg >= 0)
2866 exim_fail("exim: incompatible arguments\n");
2868 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2869 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2870 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2871 continue_sequence = Uatoi(argv[++i]);
2872 msg_action = MSG_DELIVER;
2873 msg_action_arg = ++i;
2874 forced_delivery = TRUE;
2875 queue_run_pid = passed_qr_pid;
2876 queue_run_pipe = passed_qr_pipe;
2878 if (!mac_ismsgid(argv[i]))
2879 exim_fail("exim: malformed message id %s after -MC option\n",
2882 /* Set up $sending_ip_address and $sending_port, unless proxied */
2884 if (!continue_proxy_cipher)
2885 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2887 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2890 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2893 testharness_pause_ms(500);
2897 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2901 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2902 precedes -MC (see above). The flag indicates that the host to which
2903 Exim is connected has accepted an AUTH sequence. */
2905 case 'A': f.smtp_authenticated = TRUE; break;
2907 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2908 that exim is connected to supports the esmtp extension DSN */
2910 case 'D': smtp_peer_options |= OPTION_DSN; break;
2912 /* -MCd: for debug, set a process-purpose string */
2914 case 'd': if (++i < argc)
2915 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2919 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2920 from the commandline should be tainted - but we will need an untainted
2921 value for the spoolfile when doing a -odi delivery process. */
2923 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2927 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2929 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2931 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2932 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2933 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2935 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2937 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2942 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2943 it preceded -MC (see above) */
2945 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2947 #ifdef SUPPORT_SOCKS
2948 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2949 case 'p': proxy_session = TRUE;
2952 proxy_local_address = string_copy_taint(argv[i], TRUE);
2955 proxy_local_port = Uatoi(argv[i]);
2958 proxy_external_address = string_copy_taint(argv[i], TRUE);
2961 proxy_external_port = Uatoi(argv[i]);
2967 /* -MCQ: pass on the pid of the queue-running process that started
2968 this chain of deliveries and the fd of its synchronizing pipe; this
2969 is useful only when it precedes -MC (see above) */
2971 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2973 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2977 /* -MCq: do a quota check on the given recipient for the given size
2978 of message. Separate from -MC. */
2979 case 'q': rcpt_verify_quota = TRUE;
2980 if (++i < argc) message_size = Uatoi(argv[i]);
2984 /* -MCS: set the smtp_use_size flag; this is useful only when it
2985 precedes -MC (see above) */
2987 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2990 /* -MCs: used with -MCt; SNI was sent */
2991 /* -MCr: ditto, DANE */
2994 case 's': if (++i < argc)
2996 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
2997 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3002 /* -MCt: similar to -MCT below but the connection is still open
3003 via a proxy process which handles the TLS context and coding.
3004 Require three arguments for the proxied local address and port,
3005 and the TLS cipher. */
3007 case 't': if (++i < argc)
3008 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
3011 sending_port = (int)(Uatol(argv[i]));
3014 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
3018 /* -MCT: set the tls_offered flag; this is useful only when it
3019 precedes -MC (see above). The flag indicates that the host to which
3020 Exim is connected has offered TLS support. */
3022 case 'T': smtp_peer_options |= OPTION_TLS; break;
3025 default: badarg = TRUE; break;
3030 /* -M[x]: various operations on the following list of message ids:
3031 -M deliver the messages, ignoring next retry times and thawing
3032 -Mc deliver the messages, checking next retry times, no thawing
3033 -Mf freeze the messages
3034 -Mg give up on the messages
3035 -Mt thaw the messages
3036 -Mrm remove the messages
3037 In the above cases, this must be the last option. There are also the
3038 following options which are followed by a single message id, and which
3039 act on that message. Some of them use the "recipient" addresses as well.
3040 -Mar add recipient(s)
3041 -MG move to a different queue
3042 -Mmad mark all recipients delivered
3043 -Mmd mark recipients(s) delivered
3045 -Mset load a message for use with -be
3047 -Mvc show copy (of whole message, in RFC 2822 format)
3054 msg_action = MSG_DELIVER;
3055 forced_delivery = f.deliver_force_thaw = TRUE;
3057 else if (Ustrcmp(argrest, "ar") == 0)
3059 msg_action = MSG_ADD_RECIPIENT;
3060 one_msg_action = TRUE;
3062 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3063 else if (Ustrcmp(argrest, "es") == 0)
3065 msg_action = MSG_EDIT_SENDER;
3066 one_msg_action = TRUE;
3068 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3069 else if (Ustrcmp(argrest, "g") == 0)
3071 msg_action = MSG_DELIVER;
3072 deliver_give_up = TRUE;
3074 else if (Ustrcmp(argrest, "G") == 0)
3076 msg_action = MSG_SETQUEUE;
3077 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
3079 else if (Ustrcmp(argrest, "mad") == 0)
3081 msg_action = MSG_MARK_ALL_DELIVERED;
3083 else if (Ustrcmp(argrest, "md") == 0)
3085 msg_action = MSG_MARK_DELIVERED;
3086 one_msg_action = TRUE;
3088 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3089 else if (Ustrcmp(argrest, "set") == 0)
3091 msg_action = MSG_LOAD;
3092 one_msg_action = TRUE;
3094 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3095 else if (Ustrcmp(argrest, "vb") == 0)
3097 msg_action = MSG_SHOW_BODY;
3098 one_msg_action = TRUE;
3100 else if (Ustrcmp(argrest, "vc") == 0)
3102 msg_action = MSG_SHOW_COPY;
3103 one_msg_action = TRUE;
3105 else if (Ustrcmp(argrest, "vh") == 0)
3107 msg_action = MSG_SHOW_HEADER;
3108 one_msg_action = TRUE;
3110 else if (Ustrcmp(argrest, "vl") == 0)
3112 msg_action = MSG_SHOW_LOG;
3113 one_msg_action = TRUE;
3115 else { badarg = TRUE; break; }
3117 /* All the -Mxx options require at least one message id. */
3119 msg_action_arg = i + 1;
3120 if (msg_action_arg >= argc)
3121 exim_fail("exim: no message ids given after %s option\n", arg);
3123 /* Some require only message ids to follow */
3125 if (!one_msg_action)
3127 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3128 exim_fail("exim: malformed message id %s after %s option\n",
3130 goto END_ARG; /* Remaining args are ids */
3133 /* Others require only one message id, possibly followed by addresses,
3134 which will be handled as normal arguments. */
3138 if (!mac_ismsgid(argv[msg_action_arg]))
3139 exim_fail("exim: malformed message id %s after %s option\n",
3140 argv[msg_action_arg], arg);
3146 /* Some programs seem to call the -om option without the leading o;
3147 for sendmail it askes for "me too". Exim always does this. */
3150 if (*argrest) badarg = TRUE;
3154 /* -N: don't do delivery - a debugging option that stops transports doing
3155 their thing. It implies debugging at the D_v level. */
3160 f.dont_deliver = TRUE;
3161 debug_selector |= D_v;
3162 debug_file = stderr;
3168 /* -n: This means "don't alias" in sendmail, apparently.
3169 For normal invocations, it has no effect.
3170 It may affect some other options. */
3176 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3177 option to the specified value. This form uses long names. We need to handle
3178 -O option=value and -Ooption=value. */
3183 exim_fail("exim: string expected after -O\n");
3189 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3192 if (!*(alias_arg = argrest))
3193 if (i+1 < argc) alias_arg = argv[++i];
3194 else exim_fail("exim: string expected after -oA\n");
3197 /* -oB: Set a connection message max value for remote deliveries */
3200 uschar * p = argrest;
3202 if (i+1 < argc && isdigit((argv[i+1][0])))
3206 connection_max_messages = 1;
3213 exim_fail("exim: number expected after -oB\n");
3214 connection_max_messages = Uatoi(p);
3219 /* -odb: background delivery */
3222 if (Ustrcmp(argrest, "b") == 0)
3224 f.synchronous_delivery = FALSE;
3225 arg_queue_only = FALSE;
3226 queue_only_set = TRUE;
3229 /* -odd: testsuite-only: add no inter-process delays */
3231 else if (Ustrcmp(argrest, "d") == 0)
3232 f.testsuite_delays = FALSE;
3234 /* -odf: foreground delivery (smail-compatible option); same effect as
3235 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3238 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3240 f.synchronous_delivery = TRUE;
3241 arg_queue_only = FALSE;
3242 queue_only_set = TRUE;
3245 /* -odq: queue only */
3247 else if (Ustrcmp(argrest, "q") == 0)
3249 f.synchronous_delivery = FALSE;
3250 arg_queue_only = TRUE;
3251 queue_only_set = TRUE;
3254 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3255 but no remote delivery */
3257 else if (Ustrcmp(argrest, "qs") == 0)
3259 f.queue_smtp = TRUE;
3260 arg_queue_only = FALSE;
3261 queue_only_set = TRUE;
3266 /* -oex: Sendmail error flags. As these are also accepted without the
3267 leading -o prefix, for compatibility with vacation and other callers,
3268 they are handled with -e above. */
3270 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3271 -oitrue: Another sendmail syntax for the same */
3274 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3279 /* -oM*: Set various characteristics for an incoming message; actually
3280 acted on for trusted callers only. */
3285 exim_fail("exim: data expected after -oM%s\n", argrest);
3287 /* -oMa: Set sender host address */
3289 if (Ustrcmp(argrest, "a") == 0)
3290 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3292 /* -oMaa: Set authenticator name */
3294 else if (Ustrcmp(argrest, "aa") == 0)
3295 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3297 /* -oMas: setting authenticated sender */
3299 else if (Ustrcmp(argrest, "as") == 0)
3300 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3302 /* -oMai: setting authenticated id */
3304 else if (Ustrcmp(argrest, "ai") == 0)
3305 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3307 /* -oMi: Set incoming interface address */
3309 else if (Ustrcmp(argrest, "i") == 0)
3310 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3312 /* -oMm: Message reference */
3314 else if (Ustrcmp(argrest, "m") == 0)
3316 if (!mac_ismsgid(argv[i+1]))
3317 exim_fail("-oMm must be a valid message ID\n");
3318 if (!f.trusted_config)
3319 exim_fail("-oMm must be called by a trusted user/config\n");
3320 message_reference = argv[++i];
3323 /* -oMr: Received protocol */
3325 else if (Ustrcmp(argrest, "r") == 0)
3327 if (received_protocol)
3328 exim_fail("received_protocol is set already\n");
3330 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3332 /* -oMs: Set sender host name */
3334 else if (Ustrcmp(argrest, "s") == 0)
3335 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3337 /* -oMt: Set sender ident */
3339 else if (Ustrcmp(argrest, "t") == 0)
3341 sender_ident_set = TRUE;
3342 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3345 /* Else a bad argument */
3352 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3353 seem to call this as -m (undocumented), so that is also accepted (see
3355 /* -oo: An ancient flag for old-style addresses which still seems to
3356 crop up in some calls (see in SCO). */
3360 if (*argrest) badarg = TRUE;
3363 /* -oP <name>: set pid file path for daemon
3364 -oPX: delete pid file of daemon */
3367 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3368 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3369 "(uid=%d euid=%d | %d)\n",
3370 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3371 if (!*argrest) override_pid_file_path = argv[++i];
3372 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3377 /* -or <n>: set timeout for non-SMTP acceptance
3378 -os <n>: set timeout for SMTP acceptance */
3383 int * tp = argrest[-1] == 'r'
3384 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3386 *tp = readconf_readtime(argrest, 0, FALSE);
3387 else if (i+1 < argc)
3388 *tp = readconf_readtime(argv[++i], 0, FALSE);
3391 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3395 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3396 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3399 if (*argrest) badarg = TRUE;
3400 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3403 /* -oY: Override creation of daemon notifier socket */
3406 if (*argrest) badarg = TRUE;
3407 else notifier_socket = NULL;
3410 /* Unknown -o argument */
3418 /* -ps: force Perl startup; -pd force delayed Perl startup */
3422 if (*argrest == 's' && argrest[1] == 0)
3424 perl_start_option = 1;
3427 if (*argrest == 'd' && argrest[1] == 0)
3429 perl_start_option = -1;
3434 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3435 which sets the host protocol and host name */
3438 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3442 uschar * hn = Ustrchr(argrest, ':');
3444 if (received_protocol)
3445 exim_fail("received_protocol is set already\n");
3448 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3451 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3452 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3453 sender_host_name = string_copy_taint(hn + 1, TRUE);
3460 receiving_message = FALSE;
3461 if (queue_interval >= 0)
3462 exim_fail("exim: -q specified more than once\n");
3464 /* -qq...: Do queue runs in a 2-stage manner */
3466 if (*argrest == 'q')
3468 f.queue_2stage = TRUE;
3472 /* -qi...: Do only first (initial) deliveries */
3474 if (*argrest == 'i')
3476 f.queue_run_first_delivery = TRUE;
3480 /* -qf...: Run the queue, forcing deliveries
3481 -qff..: Ditto, forcing thawing as well */
3483 if (*argrest == 'f')
3485 f.queue_run_force = TRUE;
3486 if (*++argrest == 'f')
3488 f.deliver_force_thaw = TRUE;
3493 /* -q[f][f]l...: Run the queue only on local deliveries */
3495 if (*argrest == 'l')
3497 f.queue_run_local = TRUE;
3501 /* -q[f][f][l][G<name>]... Work on the named queue */
3503 if (*argrest == 'G')
3506 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3507 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3508 queue_name = string_copyn(argrest, i);
3510 if (*argrest == '/') argrest++;
3513 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3514 only, optionally named, optionally starting from a given message id. */
3516 if (!(list_queue || count_queue))
3518 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3521 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3522 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3523 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3524 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3527 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3528 forced, optionally local only, optionally named. */
3530 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3532 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3536 case 'R': /* Synonymous with -qR... */
3538 const uschar *tainted_selectstr;
3540 receiving_message = FALSE;
3542 /* -Rf: As -R (below) but force all deliveries,
3543 -Rff: Ditto, but also thaw all frozen messages,
3544 -Rr: String is regex
3545 -Rrf: Regex and force
3546 -Rrff: Regex and force and thaw
3548 in all cases provided there are no further characters in this
3552 for (int i = 0; i < nelem(rsopts); i++)
3553 if (Ustrcmp(argrest, rsopts[i]) == 0)
3555 if (i != 2) f.queue_run_force = TRUE;
3556 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3557 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3558 argrest += Ustrlen(rsopts[i]);
3561 /* -R: Set string to match in addresses for forced queue run to
3562 pick out particular messages. */
3564 /* Avoid attacks from people providing very long strings, and do so before
3567 tainted_selectstr = argrest;
3568 else if (i+1 < argc)
3569 tainted_selectstr = argv[++i];
3571 exim_fail("exim: string expected after -R\n");
3572 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3576 /* -r: an obsolete synonym for -f (see above) */
3579 /* -S: Like -R but works on sender. */
3581 case 'S': /* Synonymous with -qS... */
3583 const uschar *tainted_selectstr;
3585 receiving_message = FALSE;
3587 /* -Sf: As -S (below) but force all deliveries,
3588 -Sff: Ditto, but also thaw all frozen messages,
3589 -Sr: String is regex
3590 -Srf: Regex and force
3591 -Srff: Regex and force and thaw
3593 in all cases provided there are no further characters in this
3597 for (int i = 0; i < nelem(rsopts); i++)
3598 if (Ustrcmp(argrest, rsopts[i]) == 0)
3600 if (i != 2) f.queue_run_force = TRUE;
3601 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3602 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3603 argrest += Ustrlen(rsopts[i]);
3606 /* -S: Set string to match in addresses for forced queue run to
3607 pick out particular messages. */
3610 tainted_selectstr = argrest;
3611 else if (i+1 < argc)
3612 tainted_selectstr = argv[++i];
3614 exim_fail("exim: string expected after -S\n");
3615 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3619 /* -Tqt is an option that is exclusively for use by the testing suite.
3620 It is not recognized in other circumstances. It allows for the setting up
3621 of explicit "queue times" so that various warning/retry things can be
3622 tested. Otherwise variability of clock ticks etc. cause problems. */
3625 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3626 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3631 /* -t: Set flag to extract recipients from body of message. */
3634 if (!*argrest) extract_recipients = TRUE;
3636 /* -ti: Set flag to extract recipients from body of message, and also
3637 specify that dot does not end the message. */
3639 else if (Ustrcmp(argrest, "i") == 0)
3641 extract_recipients = TRUE;
3645 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3648 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3655 /* -U: This means "initial user submission" in sendmail, apparently. The
3656 doc claims that in future sendmail may refuse syntactically invalid
3657 messages instead of fixing them. For the moment, we just ignore it. */
3663 /* -v: verify things - this is a very low-level debugging */
3668 debug_selector |= D_v;
3669 debug_file = stderr;
3675 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3677 The -x flag tells the sendmail command that mail from a local
3678 mail program has National Language Support (NLS) extended characters
3679 in the body of the mail item. The sendmail command can send mail with
3680 extended NLS characters across networks that normally corrupts these
3683 As Exim is 8-bit clean, it just ignores this flag. */
3686 if (*argrest) badarg = TRUE;
3689 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3690 logs to that file. We swallow the parameter and otherwise ignore it. */
3695 exim_fail("exim: string expected after -X\n");
3698 /* -z: a line of text to log */
3703 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3705 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3708 /* All other initial characters are errors */
3713 } /* End of high-level switch statement */
3715 /* Failed to recognize the option, or syntax error */
3718 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3719 "option %s\n", arg);
3723 /* If -R or -S have been specified without -q, assume a single queue run. */
3725 if ( (deliver_selectstring || deliver_selectstring_sender)
3726 && queue_interval < 0)
3731 store_pool = old_pool;
3734 /* If usage_wanted is set we call the usage function - which never returns */
3735 if (usage_wanted) exim_usage(called_as);
3737 /* Arguments have been processed. Check for incompatibilities. */
3738 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3739 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3740 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3741 || filter_test != FTEST_NONE
3742 || msg_action_arg > 0 && !one_msg_action
3744 || ( msg_action_arg > 0
3745 && ( f.daemon_listen || queue_interval > 0 || list_options
3746 || checking && msg_action != MSG_LOAD
3747 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3749 || ( (f.daemon_listen || queue_interval > 0)
3750 && ( sender_address || list_options || list_queue || checking
3753 || f.daemon_listen && queue_interval == 0
3754 || f.inetd_wait_mode && queue_interval >= 0
3756 && ( checking || smtp_input || extract_recipients
3757 || filter_test != FTEST_NONE || bi_option
3759 || ( verify_address_mode
3760 && ( f.address_test_mode || smtp_input || extract_recipients
3761 || filter_test != FTEST_NONE || bi_option
3763 || ( f.address_test_mode
3764 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3768 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3770 || deliver_selectstring && queue_interval < 0
3771 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3773 exim_fail("exim: incompatible command-line options or arguments\n");
3775 /* If debugging is set up, set the file and the file descriptor to pass on to
3776 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3777 to run in the foreground. */
3779 if (debug_selector != 0)
3781 debug_file = stderr;
3782 debug_fd = fileno(debug_file);
3783 f.background_daemon = FALSE;
3784 testharness_pause_ms(100); /* lets caller finish */
3785 if (debug_selector != D_v) /* -v only doesn't show this */
3787 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3788 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3790 if (!version_printed)
3791 show_whats_supported(FALSE);
3795 /* When started with root privilege, ensure that the limits on the number of
3796 open files and the number of processes (where that is accessible) are
3797 sufficiently large, or are unset, in case Exim has been called from an
3798 environment where the limits are screwed down. Not all OS have the ability to
3799 change some of these limits. */
3803 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3809 #ifdef RLIMIT_NOFILE
3810 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3812 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3814 rlp.rlim_cur = rlp.rlim_max = 0;
3817 /* I originally chose 1000 as a nice big number that was unlikely to
3818 be exceeded. It turns out that some older OS have a fixed upper limit of
3821 if (rlp.rlim_cur < 1000)
3823 rlp.rlim_cur = rlp.rlim_max = 1000;
3824 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3826 rlp.rlim_cur = rlp.rlim_max = 256;
3827 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3828 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3835 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3837 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3839 rlp.rlim_cur = rlp.rlim_max = 0;
3842 # ifdef RLIM_INFINITY
3843 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3845 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3847 if (rlp.rlim_cur < 1000)
3849 rlp.rlim_cur = rlp.rlim_max = 1000;
3851 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3852 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3858 /* Exim is normally entered as root (but some special configurations are
3859 possible that don't do this). However, it always spins off sub-processes that
3860 set their uid and gid as required for local delivery. We don't want to pass on
3861 any extra groups that root may belong to, so we want to get rid of them all at
3864 We need to obey setgroups() at this stage, before possibly giving up root
3865 privilege for a changed configuration file, but later on we might need to
3866 check on the additional groups for the admin user privilege - can't do that
3867 till after reading the config, which might specify the exim gid. Therefore,
3868 save the group list here first. */
3870 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3871 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3873 /* There is a fundamental difference in some BSD systems in the matter of
3874 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3875 known not to be different. On the "different" systems there is a single group
3876 list, and the first entry in it is the current group. On all other versions of
3877 Unix there is a supplementary group list, which is in *addition* to the current
3878 group. Consequently, to get rid of all extraneous groups on a "standard" system
3879 you pass over 0 groups to setgroups(), while on a "different" system you pass
3880 over a single group - the current group, which is always the first group in the
3881 list. Calling setgroups() with zero groups on a "different" system results in
3882 an error return. The following code should cope with both types of system.
3884 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3885 the "setgroups() with zero groups" - and changes the egid.
3886 Thanks to that we had to stash the original_egid above, for use below
3887 in the call to exim_setugid().
3889 However, if this process isn't running as root, setgroups() can't be used
3890 since you have to be root to run it, even if throwing away groups.
3891 Except, sigh, for Hurd - where you can.
3892 Not being root here happens only in some unusual configurations. */
3895 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3896 && setgroups(0, NULL) != 0
3898 && setgroups(1, group_list) != 0)
3899 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3901 /* If the configuration file name has been altered by an argument on the
3902 command line (either a new file name or a macro definition) and the caller is
3903 not root, or if this is a filter testing run, remove any setuid privilege the
3904 program has and run as the underlying user.
3906 The exim user is locked out of this, which severely restricts the use of -C
3909 Otherwise, set the real ids to the effective values (should be root unless run
3910 from inetd, which it can either be root or the exim uid, if one is configured).
3912 There is a private mechanism for bypassing some of this, in order to make it
3913 possible to test lots of configurations automatically, without having either to
3914 recompile each time, or to patch in an actual configuration file name and other
3915 values (such as the path name). If running in the test harness, pretend that
3916 configuration file changes and macro definitions haven't happened. */
3919 (!f.trusted_config || /* Config changed, or */
3920 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3921 real_uid != root_uid && /* Not root, and */
3922 !f.running_in_test_harness /* Not fudged */
3924 expansion_test /* expansion testing */
3926 filter_test != FTEST_NONE) /* Filter testing */
3928 setgroups(group_count, group_list);
3929 exim_setugid(real_uid, real_gid, FALSE,
3930 US"-C, -D, -be or -bf forces real uid");
3931 removed_privilege = TRUE;
3933 /* In the normal case when Exim is called like this, stderr is available
3934 and should be used for any logging information because attempts to write
3935 to the log will usually fail. To arrange this, we unset really_exim. However,
3936 if no stderr is available there is no point - we might as well have a go
3937 at the log (if it fails, syslog will be written).
3939 Note that if the invoker is Exim, the logs remain available. Messing with
3940 this causes unlogged successful deliveries. */
3942 if (log_stderr && real_uid != exim_uid)
3943 f.really_exim = FALSE;
3946 /* Privilege is to be retained for the moment. It may be dropped later,
3947 depending on the job that this Exim process has been asked to do. For now, set
3948 the real uid to the effective so that subsequent re-execs of Exim are done by a
3952 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3954 /* If testing a filter, open the file(s) now, before wasting time doing other
3955 setups and reading the message. */
3957 if (filter_test & FTEST_SYSTEM)
3958 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3959 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3962 if (filter_test & FTEST_USER)
3963 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3964 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3967 /* Initialise lookup_list
3968 If debugging, already called above via version reporting.
3969 In either case, we initialise the list of available lookups while running
3970 as root. All dynamically modules are loaded from a directory which is
3971 hard-coded into the binary and is code which, if not a module, would be
3972 part of Exim already. Ability to modify the content of the directory
3973 is equivalent to the ability to modify a setuid binary!
3975 This needs to happen before we read the main configuration. */
3978 /*XXX this excrescence could move to the testsuite standard config setup file */
3980 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3983 /* Read the main runtime configuration data; this gives up if there
3984 is a failure. It leaves the configuration file open so that the subsequent
3985 configuration data for delivery can be read if needed.
3987 NOTE: immediately after opening the configuration file we change the working
3988 directory to "/"! Later we change to $spool_directory. We do it there, because
3989 during readconf_main() some expansion takes place already. */
3991 /* Store the initial cwd before we change directories. Can be NULL if the
3992 dir has already been unlinked. */
3993 initial_cwd = os_getcwd(NULL, 0);
3994 if (!initial_cwd && errno)
3995 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
3997 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
3998 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4001 -be[m] expansion test -
4002 -b[fF] filter test new
4004 -bmalware malware_test_file new
4006 -brw rewrite test new
4008 -bv[s] address verify -
4010 -bP <option> (except -bP config, which sets list_config)
4012 If any of these options is set, we suppress warnings about configuration
4013 issues (currently about tls_advertise_hosts and keep_environment not being
4017 int old_pool = store_pool;
4018 #ifdef MEASURE_TIMING
4019 struct timeval t0, diff;
4020 (void)gettimeofday(&t0, NULL);
4023 store_pool = POOL_CONFIG;
4024 readconf_main(checking || list_options);
4025 store_pool = old_pool;
4027 #ifdef MEASURE_TIMING
4028 report_time_since(&t0, US"readconf_main (delta)");
4032 /* Now in directory "/" */
4034 if (cleanup_environment() == FALSE)
4035 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4038 /* If an action on specific messages is requested, or if a daemon or queue
4039 runner is being started, we need to know if Exim was called by an admin user.
4040 This is the case if the real user is root or exim, or if the real group is
4041 exim, or if one of the supplementary groups is exim or a group listed in
4042 admin_groups. We don't fail all message actions immediately if not admin_user,
4043 since some actions can be performed by non-admin users. Instead, set admin_user
4044 for later interrogation. */
4046 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4047 f.admin_user = TRUE;
4049 for (int i = 0; i < group_count && !f.admin_user; i++)
4050 if (group_list[i] == exim_gid)
4051 f.admin_user = TRUE;
4052 else if (admin_groups)
4053 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4054 if (admin_groups[j] == group_list[i])
4055 f.admin_user = TRUE;
4057 /* Another group of privileged users are the trusted users. These are root,
4058 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4059 are permitted to specify sender_addresses with -f on the command line, and
4060 other message parameters as well. */
4062 if (real_uid == root_uid || real_uid == exim_uid)
4063 f.trusted_caller = TRUE;
4067 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4068 if (trusted_users[i] == real_uid)
4069 f.trusted_caller = TRUE;
4072 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4073 if (trusted_groups[i] == real_gid)
4074 f.trusted_caller = TRUE;
4075 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4076 if (trusted_groups[i] == group_list[j])
4077 f.trusted_caller = TRUE;
4080 /* At this point, we know if the user is privileged and some command-line
4081 options become possibly impermissible, depending upon the configuration file. */
4083 if (checking && commandline_checks_require_admin && !f.admin_user)
4084 exim_fail("exim: those command-line flags are set to require admin\n");
4086 /* Handle the decoding of logging options. */
4088 decode_bits(log_selector, log_selector_size, log_notall,
4089 log_selector_string, log_options, log_options_count, US"log", 0);
4093 debug_printf("configuration file is %s\n", config_main_filename);
4094 debug_printf("log selectors =");
4095 for (int i = 0; i < log_selector_size; i++)
4096 debug_printf(" %08x", log_selector[i]);
4100 /* If domain literals are not allowed, check the sender address that was
4101 supplied with -f. Ditto for a stripped trailing dot. */
4105 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4106 exim_fail("exim: bad -f address \"%s\": domain literals not "
4107 "allowed\n", sender_address);
4108 if (f_end_dot && !strip_trailing_dot)
4109 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4110 "(trailing dot not allowed)\n", sender_address);
4113 /* See if an admin user overrode our logging. */
4115 if (cmdline_syslog_name)
4118 syslog_processname = cmdline_syslog_name;
4119 log_file_path = string_copy(CUS"syslog");
4122 /* not a panic, non-privileged users should not be able to spam paniclog */
4124 "exim: you lack sufficient privilege to specify syslog process name\n");
4126 /* Paranoia check of maximum lengths of certain strings. There is a check
4127 on the length of the log file path in log.c, which will come into effect
4128 if there are any calls to write the log earlier than this. However, if we
4129 get this far but the string is very long, it is better to stop now than to
4130 carry on and (e.g.) receive a message and then have to collapse. The call to
4131 log_write() from here will cause the ultimate panic collapse if the complete
4132 file name exceeds the buffer length. */
4134 if (Ustrlen(log_file_path) > 200)
4135 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4136 "log_file_path is longer than 200 chars: aborting");
4138 if (Ustrlen(pid_file_path) > 200)
4139 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4140 "pid_file_path is longer than 200 chars: aborting");
4142 if (Ustrlen(spool_directory) > 200)
4143 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4144 "spool_directory is longer than 200 chars: aborting");
4146 /* Length check on the process name given to syslog for its TAG field,
4147 which is only permitted to be 32 characters or less. See RFC 3164. */
4149 if (Ustrlen(syslog_processname) > 32)
4150 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4151 "syslog_processname is longer than 32 chars: aborting");
4156 log_write(0, LOG_MAIN, "%s", log_oneline);
4157 return EXIT_SUCCESS;
4160 return EXIT_FAILURE;
4162 /* In some operating systems, the environment variable TMPDIR controls where
4163 temporary files are created; Exim doesn't use these (apart from when delivering
4164 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4165 If TMPDIR is found in the environment, reset it to the value defined in the
4166 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4167 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4168 EXIM_TMPDIR by the build scripts.
4172 if (environ) for (uschar ** p = USS environ; *p; p++)
4173 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4175 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4176 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4178 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4182 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4183 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4184 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4185 called by a user who has set the TZ variable. This then affects the timestamps
4186 in log files and in Received: headers, and any created Date: header lines. The
4187 required timezone is settable in the configuration file, so nothing can be done
4188 about this earlier - but hopefully nothing will normally be logged earlier than
4189 this. We have to make a new environment if TZ is wrong, but don't bother if
4190 timestamps_utc is set, because then all times are in UTC anyway. */
4192 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4193 f.timestamps_utc = TRUE;
4196 uschar *envtz = US getenv("TZ");
4198 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4199 : timezone_string != NULL
4202 uschar **p = USS environ;
4206 if (environ) while (*p++) count++;
4207 if (!envtz) count++;
4208 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4209 if (environ) for (p = USS environ; *p; p++)
4210 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4211 if (timezone_string)
4213 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4214 sprintf(CS *newp++, "TZ=%s", timezone_string);
4219 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4220 tod_stamp(tod_log));
4224 /* Handle the case when we have removed the setuid privilege because of -C or
4225 -D. This means that the caller of Exim was not root.
4227 There is a problem if we were running as the Exim user. The sysadmin may
4228 expect this case to retain privilege because "the binary was called by the
4229 Exim user", but it hasn't, because either the -D option set macros, or the
4230 -C option set a non-trusted configuration file. There are two possibilities:
4232 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4233 to do message deliveries. Thus, the fact that it is running as a
4234 non-privileged user is plausible, and might be wanted in some special
4235 configurations. However, really_exim will have been set false when
4236 privilege was dropped, to stop Exim trying to write to its normal log
4237 files. Therefore, re-enable normal log processing, assuming the sysadmin
4238 has set up the log directory correctly.
4240 (2) If deliver_drop_privilege is not set, the configuration won't work as
4241 apparently intended, and so we log a panic message. In order to retain
4242 root for -C or -D, the caller must either be root or be invoking a
4243 trusted configuration file (when deliver_drop_privilege is false). */
4245 if ( removed_privilege
4246 && (!f.trusted_config || opt_D_used)
4247 && real_uid == exim_uid)
4248 if (deliver_drop_privilege)
4249 f.really_exim = TRUE; /* let logging work normally */
4251 log_write(0, LOG_MAIN|LOG_PANIC,
4252 "exim user lost privilege for using %s option",
4253 f.trusted_config? "-D" : "-C");
4255 /* Start up Perl interpreter if Perl support is configured and there is a
4256 perl_startup option, and the configuration or the command line specifies
4257 initializing starting. Note that the global variables are actually called
4258 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4261 if (perl_start_option != 0)
4262 opt_perl_at_start = (perl_start_option > 0);
4263 if (opt_perl_at_start && opt_perl_startup != NULL)
4266 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4267 if ((errstr = init_perl(opt_perl_startup)))
4268 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4269 opt_perl_started = TRUE;
4271 #endif /* EXIM_PERL */
4273 /* Log the arguments of the call if the configuration file said so. This is
4274 a debugging feature for finding out what arguments certain MUAs actually use.
4275 Don't attempt it if logging is disabled, or if listing variables or if
4276 verifying/testing addresses or expansions. */
4278 if ( (debug_selector & D_any || LOGGING(arguments))
4279 && f.really_exim && !list_options && !checking)
4281 uschar *p = big_buffer;
4282 Ustrcpy(p, US"cwd= (failed)");
4289 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4290 p += Ustrlen(CCS p);
4293 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4295 for (int i = 0; i < argc; i++)
4297 int len = Ustrlen(argv[i]);
4298 const uschar *printing;
4300 if (p + len + 8 >= big_buffer + big_buffer_size)
4302 Ustrcpy(p, US" ...");
4303 log_write(0, LOG_MAIN, "%s", big_buffer);
4304 Ustrcpy(big_buffer, US"...");
4307 printing = string_printing(argv[i]);
4308 if (!*printing) quote = US"\"";
4311 const uschar *pp = printing;
4313 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4315 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4316 (p - big_buffer) - 4), printing, quote);
4319 if (LOGGING(arguments))
4320 log_write(0, LOG_MAIN, "%s", big_buffer);
4322 debug_printf("%s\n", big_buffer);
4325 /* Set the working directory to be the top-level spool directory. We don't rely
4326 on this in the code, which always uses fully qualified names, but it's useful
4327 for core dumps etc. Don't complain if it fails - the spool directory might not
4328 be generally accessible and calls with the -C option (and others) have lost
4329 privilege by now. Before the chdir, we try to ensure that the directory exists.
4332 if (Uchdir(spool_directory) != 0)
4334 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4335 (void) Uchdir(spool_directory);
4338 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4339 alias file. Exim doesn't have such a concept, but this call is screwed into
4340 Sun's YP makefiles. Handle this by calling a configured script, as the real
4341 user who called Exim. The -oA option can be used to pass an argument to the
4346 (void) fclose(config_file);
4347 if (bi_command && *bi_command)
4351 argv[i++] = bi_command;
4352 if (alias_arg) argv[i++] = alias_arg;
4355 setgroups(group_count, group_list);
4356 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4358 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4359 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4361 execv(CS argv[0], (char *const *)argv);
4362 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4366 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4371 /* We moved the admin/trusted check to be immediately after reading the
4372 configuration file. We leave these prints here to ensure that syslog setup,
4373 logfile setup, and so on has already happened. */
4375 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4376 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4378 /* Only an admin user may start the daemon or force a queue run in the default
4379 configuration, but the queue run restriction can be relaxed. Only an admin
4380 user may request that a message be returned to its sender forthwith. Only an
4381 admin user may specify a debug level greater than D_v (because it might show
4382 passwords, etc. in lookup queries). Only an admin user may request a queue
4383 count. Only an admin user can use the test interface to scan for email
4384 (because Exim will be in the spool dir and able to look at mails). */
4388 BOOL debugset = (debug_selector & ~D_v) != 0;
4389 if ( deliver_give_up || f.daemon_listen || malware_test_file
4390 || count_queue && queue_list_requires_admin
4391 || list_queue && queue_list_requires_admin
4392 || queue_interval >= 0 && prod_requires_admin
4393 || queue_name_dest && prod_requires_admin
4394 || debugset && !f.running_in_test_harness
4396 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4399 /* If the real user is not root or the exim uid, the argument for passing
4400 in an open TCP/IP connection for another message is not permitted, nor is
4401 running with the -N option for any delivery action, unless this call to exim is
4402 one that supplied an input message, or we are using a patched exim for
4403 regression testing. */
4405 if ( real_uid != root_uid && real_uid != exim_uid
4406 && ( continue_hostname
4408 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4410 && !f.running_in_test_harness
4412 exim_fail("exim: Permission denied\n");
4414 /* If the caller is not trusted, certain arguments are ignored when running for
4415 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4416 Note that authority for performing certain actions on messages is tested in the
4417 queue_action() function. */
4419 if (!f.trusted_caller && !checking)
4421 sender_host_name = sender_host_address = interface_address =
4422 sender_ident = received_protocol = NULL;
4423 sender_host_port = interface_port = 0;
4424 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4427 /* If a sender host address is set, extract the optional port number off the
4428 end of it and check its syntax. Do the same thing for the interface address.
4429 Exim exits if the syntax is bad. */
4433 if (sender_host_address)
4434 sender_host_port = check_port(sender_host_address);
4435 if (interface_address)
4436 interface_port = check_port(interface_address);
4439 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4442 if (f.trusted_caller)
4444 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4445 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4448 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4451 /* If an SMTP message is being received check to see if the standard input is a
4452 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4453 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4458 union sockaddr_46 inetd_sock;
4459 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4460 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4462 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4463 if (family == AF_INET || family == AF_INET6)
4465 union sockaddr_46 interface_sock;
4466 size = sizeof(interface_sock);
4468 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4469 interface_address = host_ntoa(-1, &interface_sock, NULL,
4472 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4474 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4477 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4478 NULL, &sender_host_port);
4479 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4480 "inetd is not supported when mua_wrapper is set");
4484 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4489 /* If the load average is going to be needed while receiving a message, get it
4490 now for those OS that require the first call to os_getloadavg() to be done as
4491 root. There will be further calls later for each message received. */
4493 #ifdef LOAD_AVG_NEEDS_ROOT
4494 if ( receiving_message
4495 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4496 load_average = OS_GETLOADAVG();
4499 /* The queue_only configuration option can be overridden by -odx on the command
4500 line, except that if queue_only_override is false, queue_only cannot be unset
4501 from the command line. */
4503 if (queue_only_set && (queue_only_override || arg_queue_only))
4504 queue_only = arg_queue_only;
4506 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4509 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4510 if (arg_smtp_receive_timeout >= 0)
4511 smtp_receive_timeout = arg_smtp_receive_timeout;
4513 /* If Exim was started with root privilege, unless we have already removed the
4514 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4515 except when starting the daemon or doing some kind of delivery or address
4516 testing (-bt). These are the only cases when root need to be retained. We run
4517 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4518 retained only for starting the daemon. We always do the initgroups() in this
4519 situation (controlled by the TRUE below), in order to be as close as possible
4520 to the state Exim usually runs in. */
4522 if ( !unprivileged /* originally had root AND */
4523 && !removed_privilege /* still got root AND */
4524 && !f.daemon_listen /* not starting the daemon */
4525 && queue_interval <= 0 /* (either kind of daemon) */
4526 && ( /* AND EITHER */
4527 deliver_drop_privilege /* requested unprivileged */
4529 queue_interval < 0 /* not running the queue */
4530 && ( msg_action_arg < 0 /* and */
4531 || msg_action != MSG_DELIVER /* not delivering */
4533 && (!checking || !f.address_test_mode) /* not address checking */
4534 && !rcpt_verify_quota /* and not quota checking */
4536 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4538 /* When we are retaining a privileged uid, we still change to the exim gid. */
4543 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4544 rv = setgid(exim_gid);
4545 /* Impact of failure is that some stuff might end up with an incorrect group.
4546 We track this for failures from root, since any attempt to change privilege
4547 by root should succeed and failures should be examined. For non-root,
4548 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4549 no need to complain then. */
4551 if (!(unprivileged || removed_privilege))
4552 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4555 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4556 (long int)exim_gid, strerror(errno));
4560 /* Handle a request to scan a file for malware */
4561 if (malware_test_file)
4563 #ifdef WITH_CONTENT_SCAN
4565 set_process_info("scanning file for malware");
4566 if ((result = malware_in_file(malware_test_file)) == FAIL)
4568 printf("No malware found.\n");
4573 printf("Malware lookup returned non-okay/fail: %d\n", result);
4577 printf("Malware found: %s\n", malware_name);
4579 printf("Malware scan detected malware of unknown name.\n");
4581 printf("Malware scanning not enabled at compile time.\n");
4586 /* Handle a request to list the delivery queue */
4590 set_process_info("listing the queue");
4591 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4595 /* Handle a request to count the delivery queue */
4599 set_process_info("counting the queue");
4600 fprintf(stdout, "%u\n", queue_count());
4604 /* Handle actions on specific messages, except for the force delivery and
4605 message load actions, which are done below. Some actions take a whole list of
4606 message ids, which are known to continue up to the end of the arguments. Others
4607 take a single message id and then operate on the recipients list. */
4609 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4611 int yield = EXIT_SUCCESS;
4612 set_process_info("acting on specified messages");
4614 /* ACL definitions may be needed when removing a message (-Mrm) because
4615 event_action gets expanded */
4617 if (msg_action == MSG_REMOVE)
4619 int old_pool = store_pool;
4620 store_pool = POOL_CONFIG;
4622 store_pool = old_pool;
4623 store_writeprotect(POOL_CONFIG);
4626 if (!one_msg_action)
4628 for (i = msg_action_arg; i < argc; i++)
4629 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4630 yield = EXIT_FAILURE;
4633 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4634 default: printf("\n"); break;
4638 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4639 recipients_arg)) yield = EXIT_FAILURE;
4643 /* We used to set up here to skip reading the ACL section, on
4644 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4645 Now, since the intro of the ${acl } expansion, ACL definitions may be
4646 needed in transports so we lost the optimisation. */
4649 int old_pool = store_pool;
4650 #ifdef MEASURE_TIMING
4651 struct timeval t0, diff;
4652 (void)gettimeofday(&t0, NULL);
4655 store_pool = POOL_CONFIG;
4657 store_pool = old_pool;
4659 /* -be can add macro definitions, needing to link to the macro structure
4660 chain. Otherwise, make the memory used for config data readonly. */
4662 if (!expansion_test)
4663 store_writeprotect(POOL_CONFIG);
4665 #ifdef MEASURE_TIMING
4666 report_time_since(&t0, US"readconf_rest (delta)");
4670 /* Handle a request to check quota */
4671 if (rcpt_verify_quota)
4672 if (real_uid != root_uid && real_uid != exim_uid)
4673 exim_fail("exim: Permission denied\n");
4674 else if (recipients_arg >= argc)
4675 exim_fail("exim: missing recipient for quota check\n");
4678 verify_quota(argv[recipients_arg]);
4679 exim_exit(EXIT_SUCCESS);
4682 /* Handle the -brt option. This is for checking out retry configurations.
4683 The next three arguments are a domain name or a complete address, and
4684 optionally two error numbers. All it does is to call the function that
4685 scans the retry configuration data. */
4687 if (test_retry_arg >= 0)
4689 retry_config *yield;
4690 int basic_errno = 0;
4692 const uschar *s1, *s2;
4694 if (test_retry_arg >= argc)
4696 printf("-brt needs a domain or address argument\n");
4697 exim_exit(EXIT_FAILURE);
4699 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4702 /* If the first argument contains no @ and no . it might be a local user
4703 or it might be a single-component name. Treat as a domain. */
4705 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4707 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4708 "being \ntreated as a one-component domain, not as a local part.\n\n",
4712 /* There may be an optional second domain arg. */
4714 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4715 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4717 /* The final arg is an error name */
4719 if (test_retry_arg < argc)
4721 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4723 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4726 printf("%s\n", CS error);
4727 return EXIT_FAILURE;
4730 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4731 code > 100 as an error is for matching codes to the decade. Turn them into
4732 a real error code, off the decade. */
4734 if (basic_errno == ERRNO_MAIL4XX ||
4735 basic_errno == ERRNO_RCPT4XX ||
4736 basic_errno == ERRNO_DATA4XX)
4738 int code = (more_errno >> 8) & 255;
4740 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4741 else if (code > 100)
4742 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4746 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4747 printf("No retry information found\n");
4750 more_errno = yield->more_errno;
4751 printf("Retry rule: %s ", yield->pattern);
4753 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4755 printf("quota%s%s ",
4756 (more_errno > 0)? "_" : "",
4757 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4759 else if (yield->basic_errno == ECONNREFUSED)
4761 printf("refused%s%s ",
4762 (more_errno > 0)? "_" : "",
4763 (more_errno == 'M')? "MX" :
4764 (more_errno == 'A')? "A" : "");
4766 else if (yield->basic_errno == ETIMEDOUT)
4769 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4771 if (more_errno != 0) printf("_%s",
4772 (more_errno == 'M')? "MX" : "A");
4775 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4776 printf("auth_failed ");
4779 for (retry_rule * r = yield->rules; r; r = r->next)
4781 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4782 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4788 printf(",%d.", x/1000);
4802 exim_exit(EXIT_SUCCESS);
4805 /* Handle a request to list one or more configuration options */
4806 /* If -n was set, we suppress some information */
4811 set_process_info("listing variables");
4812 if (recipients_arg >= argc)
4813 fail = !readconf_print(US"all", NULL, flag_n);
4814 else for (i = recipients_arg; i < argc; i++)
4817 (Ustrcmp(argv[i], "router") == 0 ||
4818 Ustrcmp(argv[i], "transport") == 0 ||
4819 Ustrcmp(argv[i], "authenticator") == 0 ||
4820 Ustrcmp(argv[i], "macro") == 0 ||
4821 Ustrcmp(argv[i], "environment") == 0))
4823 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4827 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4829 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4834 set_process_info("listing config");
4835 exim_exit(readconf_print(US"config", NULL, flag_n)
4836 ? EXIT_SUCCESS : EXIT_FAILURE);
4840 /* Initialise subsystems as required. */
4844 /* Handle a request to deliver one or more messages that are already on the
4845 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4846 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4848 Delivery of specific messages is typically used for a small number when
4849 prodding by hand (when the option forced_delivery will be set) or when
4850 re-execing to regain root privilege. Each message delivery must happen in a
4851 separate process, so we fork a process for each one, and run them sequentially
4852 so that debugging output doesn't get intertwined, and to avoid spawning too
4853 many processes if a long list is given. However, don't fork for the last one;
4854 this saves a process in the common case when Exim is called to deliver just one
4857 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4859 if (prod_requires_admin && !f.admin_user)
4861 fprintf(stderr, "exim: Permission denied\n");
4862 exim_exit(EXIT_FAILURE);
4864 set_process_info("delivering specified messages");
4865 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4866 for (i = msg_action_arg; i < argc; i++)
4870 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4871 that runs into a later copy into the untainted global message_id[] */
4872 /*XXX Do we need a length limit check here? */
4874 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4875 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4877 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4878 exim_underbar_exit(EXIT_SUCCESS);
4882 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4884 exim_exit(EXIT_FAILURE);
4888 exim_exit(EXIT_SUCCESS);
4892 /* If only a single queue run is requested, without SMTP listening, we can just
4893 turn into a queue runner, with an optional starting message id. */
4895 if (queue_interval == 0 && !f.daemon_listen)
4897 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4898 start_queue_run_id ? US" starting at " : US"",
4899 start_queue_run_id ? start_queue_run_id: US"",
4900 stop_queue_run_id ? US" stopping at " : US"",
4901 stop_queue_run_id ? stop_queue_run_id : US"");
4903 set_process_info("running the '%s' queue (single queue run)", queue_name);
4905 set_process_info("running the queue (single queue run)");
4906 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4907 exim_exit(EXIT_SUCCESS);
4911 /* Find the login name of the real user running this process. This is always
4912 needed when receiving a message, because it is written into the spool file. It
4913 may also be used to construct a from: or a sender: header, and in this case we
4914 need the user's full name as well, so save a copy of it, checked for RFC822
4915 syntax and munged if necessary, if it hasn't previously been set by the -F
4916 argument. We may try to get the passwd entry more than once, in case NIS or
4917 other delays are in evidence. Save the home directory for use in filter testing
4922 if ((pw = getpwuid(real_uid)) != NULL)
4924 originator_login = string_copy(US pw->pw_name);
4925 originator_home = string_copy(US pw->pw_dir);
4927 /* If user name has not been set by -F, set it from the passwd entry
4928 unless -f has been used to set the sender address by a trusted user. */
4930 if (!originator_name)
4932 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4934 uschar *name = US pw->pw_gecos;
4935 uschar *amp = Ustrchr(name, '&');
4938 /* Most Unix specify that a '&' character in the gecos field is
4939 replaced by a copy of the login name, and some even specify that
4940 the first character should be upper cased, so that's what we do. */
4945 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4946 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4947 buffer[loffset] = toupper(buffer[loffset]);
4951 /* If a pattern for matching the gecos field was supplied, apply
4952 it and then expand the name string. */
4954 if (gecos_pattern && gecos_name)
4956 const pcre2_code *re;
4957 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4959 if (regex_match_and_setup(re, name, 0, -1))
4961 uschar *new_name = expand_string(gecos_name);
4965 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4966 "gecos field \"%s\"\n", new_name, name);
4969 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4970 "\"%s\": %s\n", gecos_name, expand_string_message);
4972 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4973 "gecos field \"%s\"\n", gecos_pattern, name);
4974 store_free((void *)re);
4976 originator_name = string_copy(name);
4979 /* A trusted caller has used -f but not -F */
4981 else originator_name = US"";
4984 /* Break the retry loop */
4989 if (++i > finduser_retries) break;
4993 /* If we cannot get a user login, log the incident and give up, unless the
4994 configuration specifies something to use. When running in the test harness,
4995 any setting of unknown_login overrides the actual name. */
4997 if (!originator_login || f.running_in_test_harness)
5001 originator_login = expand_string(unknown_login);
5002 if (!originator_name && unknown_username)
5003 originator_name = expand_string(unknown_username);
5004 if (!originator_name) originator_name = US"";
5006 if (!originator_login)
5007 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5011 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5014 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5016 /* If a message is created by this call of Exim, the uid/gid of its originator
5017 are those of the caller. These values are overridden if an existing message is
5018 read in from the spool. */
5020 originator_uid = real_uid;
5021 originator_gid = real_gid;
5023 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5024 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5026 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5027 returns. We leave this till here so that the originator_ fields are available
5028 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5031 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5035 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5036 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5037 "mua_wrapper is set");
5040 # ifndef DISABLE_TLS
5041 /* This also checks that the library linkage is working and we can call
5042 routines in it, so call even if tls_require_ciphers is unset */
5044 # ifdef MEASURE_TIMING
5045 struct timeval t0, diff;
5046 (void)gettimeofday(&t0, NULL);
5048 if (!tls_dropprivs_validate_require_cipher(FALSE))
5050 # ifdef MEASURE_TIMING
5051 report_time_since(&t0, US"validate_ciphers (delta)");
5059 /* If the sender ident has not been set (by a trusted caller) set it to
5060 the caller. This will get overwritten below for an inetd call. If a trusted
5061 caller has set it empty, unset it. */
5063 if (!sender_ident) sender_ident = originator_login;
5064 else if (!*sender_ident) sender_ident = NULL;
5066 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5067 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5068 originator_* variables set. */
5070 if (test_rewrite_arg >= 0)
5072 f.really_exim = FALSE;
5073 if (test_rewrite_arg >= argc)
5075 printf("-brw needs an address argument\n");
5076 exim_exit(EXIT_FAILURE);
5078 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5079 exim_exit(EXIT_SUCCESS);
5082 /* A locally-supplied message is considered to be coming from a local user
5083 unless a trusted caller supplies a sender address with -f, or is passing in the
5084 message via SMTP (inetd invocation or otherwise). */
5086 if ( !sender_address && !smtp_input
5087 || !f.trusted_caller && filter_test == FTEST_NONE)
5089 f.sender_local = TRUE;
5091 /* A trusted caller can supply authenticated_sender and authenticated_id
5092 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5093 defaults except when host checking. */
5095 if (!authenticated_sender && !host_checking)
5096 authenticated_sender = string_sprintf("%s@%s", originator_login,
5097 qualify_domain_sender);
5098 if (!authenticated_id && !host_checking)
5099 authenticated_id = originator_login;
5102 /* Trusted callers are always permitted to specify the sender address.
5103 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5104 is specified is the empty address. However, if a trusted caller does not
5105 specify a sender address for SMTP input, we leave sender_address unset. This
5106 causes the MAIL commands to be honoured. */
5108 if ( !smtp_input && !sender_address
5109 || !receive_check_set_sender(sender_address))
5111 /* Either the caller is not permitted to set a general sender, or this is
5112 non-SMTP input and the trusted caller has not set a sender. If there is no
5113 sender, or if a sender other than <> is set, override with the originator's
5114 login (which will get qualified below), except when checking things. */
5116 if ( !sender_address /* No sender_address set */
5118 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5119 !checking)) /* Not running tests, including filter tests */
5121 sender_address = originator_login;
5122 f.sender_address_forced = FALSE;
5123 sender_address_domain = 0;
5127 /* Remember whether an untrusted caller set the sender address */
5129 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5131 /* Ensure that the sender address is fully qualified unless it is the empty
5132 address, which indicates an error message, or doesn't exist (root caller, smtp
5133 interface, no -f argument). */
5135 if (sender_address && *sender_address && sender_address_domain == 0)
5136 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5137 qualify_domain_sender);
5139 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5141 /* Handle a request to verify a list of addresses, or test them for delivery.
5142 This must follow the setting of the sender address, since routers can be
5143 predicated upon the sender. If no arguments are given, read addresses from
5144 stdin. Set debug_level to at least D_v to get full output for address testing.
5147 if (verify_address_mode || f.address_test_mode)
5150 int flags = vopt_qualify;
5152 if (verify_address_mode)
5154 if (!verify_as_sender) flags |= vopt_is_recipient;
5155 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5160 flags |= vopt_is_recipient;
5161 debug_selector |= D_v;
5162 debug_file = stderr;
5163 debug_fd = fileno(debug_file);
5164 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5167 if (recipients_arg < argc)
5168 while (recipients_arg < argc)
5170 /* Supplied addresses are tainted since they come from a user */
5171 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5174 BOOL finished = FALSE;
5175 uschar *ss = parse_find_address_end(s, FALSE);
5176 if (*ss == ',') *ss = 0; else finished = TRUE;
5177 test_address(s, flags, &exit_value);
5180 while (*++s == ',' || isspace(*s)) ;
5186 uschar * s = get_stdinput(NULL, NULL);
5188 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5192 exim_exit(exit_value);
5195 /* Handle expansion checking. Either expand items on the command line, or read
5196 from stdin if there aren't any. If -Mset was specified, load the message so
5197 that its variables can be used, but restrict this facility to admin users.
5198 Otherwise, if -bem was used, read a message from stdin. */
5202 dns_init(FALSE, FALSE, FALSE);
5203 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5207 exim_fail("exim: permission denied\n");
5208 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5209 /* Checking the length of the ID is sufficient to validate it.
5210 Get an untainted version so file opens can be done. */
5211 message_id = string_copy_taint(message_id, FALSE);
5213 spoolname = string_sprintf("%s-H", message_id);
5214 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5215 printf ("Failed to load message datafile %s\n", message_id);
5216 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5217 printf ("Failed to load message %s\n", message_id);
5220 /* Read a test message from a file. We fudge it up to be on stdin, saving
5221 stdin itself for later reading of expansion strings. */
5223 else if (expansion_test_message)
5225 int save_stdin = dup(0);
5226 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5228 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5231 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5232 message_ended = END_NOTENDED;
5233 read_message_body(receive_msg(extract_recipients));
5234 message_linecount += body_linecount;
5235 (void)dup2(save_stdin, 0);
5236 (void)close(save_stdin);
5237 clearerr(stdin); /* Required by Darwin */
5240 /* Only admin users may see config-file macros this way */
5242 if (!f.admin_user) macros_user = macros = mlast = NULL;
5244 /* Allow $recipients for this testing */
5246 f.enable_dollar_recipients = TRUE;
5248 /* Expand command line items */
5250 if (recipients_arg < argc)
5251 while (recipients_arg < argc)
5252 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5258 char *(*fn_readline)(const char *) = NULL;
5259 void (*fn_addhist)(const char *) = NULL;
5263 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5266 while (s = get_stdinput(fn_readline, fn_addhist))
5267 expansion_test_line(s);
5270 if (dlhandle) dlclose(dlhandle);
5274 /* The data file will be open after -Mset */
5276 if (deliver_datafile >= 0)
5278 (void)close(deliver_datafile);
5279 deliver_datafile = -1;
5282 exim_exit(EXIT_SUCCESS);
5286 /* The active host name is normally the primary host name, but it can be varied
5287 for hosts that want to play several parts at once. We need to ensure that it is
5288 set for host checking, and for receiving messages. */
5290 smtp_active_hostname = primary_hostname;
5291 if (raw_active_hostname != NULL)
5293 uschar *nah = expand_string(raw_active_hostname);
5296 if (!f.expand_string_forcedfail)
5297 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5298 "(smtp_active_hostname): %s", raw_active_hostname,
5299 expand_string_message);
5301 else if (nah[0] != 0) smtp_active_hostname = nah;
5304 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5305 given IP address so that the blocking and relay configuration can be tested.
5306 Unless a sender_ident was set by -oMt, we discard it (the default is the
5307 caller's login name). An RFC 1413 call is made only if we are running in the
5308 test harness and an incoming interface and both ports are specified, because
5309 there is no TCP/IP call to find the ident for. */
5316 if (!sender_ident_set)
5318 sender_ident = NULL;
5319 if (f.running_in_test_harness && sender_host_port
5320 && interface_address && interface_port)
5321 verify_get_ident(1223); /* note hardwired port number */
5324 /* In case the given address is a non-canonical IPv6 address, canonicalize
5325 it. The code works for both IPv4 and IPv6, as it happens. */
5327 size = host_aton(sender_host_address, x);
5328 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5329 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5331 /* Now set up for testing */
5333 host_build_sender_fullhost();
5337 f.sender_local = FALSE;
5338 f.sender_host_notsocket = TRUE;
5339 debug_file = stderr;
5340 debug_fd = fileno(debug_file);
5341 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5342 "**** but without any ident (RFC 1413) callback.\n"
5343 "**** This is not for real!\n\n",
5344 sender_host_address);
5346 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5347 if (verify_check_host(&hosts_connection_nolog) == OK)
5348 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5349 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5351 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5352 because a log line has already been written for all its failure exists
5353 (usually "connection refused: <reason>") and writing another one is
5354 unnecessary clutter. */
5356 if (smtp_start_session())
5359 for (; (reset_point = store_mark()); store_reset(reset_point))
5361 if (smtp_setup_msg() <= 0) break;
5362 if (!receive_msg(FALSE)) break;
5364 return_path = sender_address = NULL;
5365 dnslist_domain = dnslist_matched = NULL;
5366 #ifndef DISABLE_DKIM
5367 dkim_cur_signer = NULL;
5370 deliver_localpart_orig = NULL;
5371 deliver_domain_orig = NULL;
5372 callout_address = sending_ip_address = NULL;
5373 deliver_localpart_data = deliver_domain_data =
5374 recipient_data = sender_data = NULL;
5375 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5379 exim_exit(EXIT_SUCCESS);
5383 /* Arrange for message reception if recipients or SMTP were specified;
5384 otherwise complain unless a version print (-bV) happened or this is a filter
5385 verification test or info dump.
5386 In the former case, show the configuration file name. */
5388 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5390 if (version_printed)
5392 if (Ustrchr(config_main_filelist, ':'))
5393 printf("Configuration file search path is %s\n", config_main_filelist);
5394 printf("Configuration file is %s\n", config_main_filename);
5395 return EXIT_SUCCESS;
5398 if (info_flag != CMDINFO_NONE)
5400 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5401 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5404 if (filter_test == FTEST_NONE)
5405 exim_usage(called_as);
5409 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5410 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5411 that we are not called from inetd, because that is rejected above. The
5412 following configuration settings are forced here:
5414 (1) Synchronous delivery (-odi)
5415 (2) Errors to stderr (-oep == -oeq)
5416 (3) No parallel remote delivery
5417 (4) Unprivileged delivery
5419 We don't force overall queueing options because there are several of them;
5420 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5421 to override any SMTP queueing. */
5425 f.synchronous_delivery = TRUE;
5426 arg_error_handling = ERRORS_STDERR;
5427 remote_max_parallel = 1;
5428 deliver_drop_privilege = TRUE;
5429 f.queue_smtp = FALSE;
5430 queue_smtp_domains = NULL;
5432 message_utf8_downconvert = -1; /* convert-if-needed */
5437 /* Prepare to accept one or more new messages on the standard input. When a
5438 message has been read, its id is returned in message_id[]. If doing immediate
5439 delivery, we fork a delivery process for each received message, except for the
5440 last one, where we can save a process switch.
5442 It is only in non-smtp mode that error_handling is allowed to be changed from
5443 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5444 sendmail error modes other than -oem ever actually used? Later: yes.) */
5446 if (!smtp_input) error_handling = arg_error_handling;
5448 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5449 logging being sent down the socket and make an identd call to get the
5452 else if (f.is_inetd)
5454 (void)fclose(stderr);
5455 exim_nullstd(); /* Re-open to /dev/null */
5456 verify_get_ident(IDENT_PORT);
5457 host_build_sender_fullhost();
5458 set_process_info("handling incoming connection from %s via inetd",
5462 /* If the sender host address has been set, build sender_fullhost if it hasn't
5463 already been done (which it will have been for inetd). This caters for the
5464 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5465 so that the test for IP options is skipped for -bs input. */
5467 if (sender_host_address && !sender_fullhost)
5469 host_build_sender_fullhost();
5470 set_process_info("handling incoming connection from %s via -oMa",
5472 f.sender_host_notsocket = TRUE;
5475 /* Otherwise, set the sender host as unknown except for inetd calls. This
5476 prevents host checking in the case of -bs not from inetd and also for -bS. */
5478 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5480 /* If stdout does not exist, then dup stdin to stdout. This can happen
5481 if exim is started from inetd. In this case fd 0 will be set to the socket,
5482 but fd 1 will not be set. This also happens for passed SMTP channels. */
5484 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5486 /* Set up the incoming protocol name and the state of the program. Root is
5487 allowed to force received protocol via the -oMr option above. If we have come
5488 via inetd, the process info has already been set up. We don't set
5489 received_protocol here for smtp input, as it varies according to
5490 batch/HELO/EHLO/AUTH/TLS. */
5494 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5495 smtp_batched_input? "batched " : "",
5496 sender_address ? sender_address : originator_login);
5500 int old_pool = store_pool;
5501 store_pool = POOL_PERM;
5502 if (!received_protocol)
5503 received_protocol = string_sprintf("local%s", called_as);
5504 store_pool = old_pool;
5505 set_process_info("accepting a local non-SMTP message from <%s>",
5509 /* Initialize the session_local_queue-only flag (this will be ignored if
5510 mua_wrapper is set) */
5513 session_local_queue_only = queue_only;
5515 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5516 the spool if so configured. On failure, we must not attempt to send an error
5517 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5518 error code is given.) */
5520 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5521 exim_fail("exim: insufficient disk space\n");
5523 /* If this is smtp input of any kind, real or batched, handle the start of the
5526 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5527 because a log line has already been written for all its failure exists
5528 (usually "connection refused: <reason>") and writing another one is
5529 unnecessary clutter. */
5535 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5536 if (verify_check_host(&hosts_connection_nolog) == OK)
5537 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5538 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5539 if (!smtp_start_session())
5542 exim_exit(EXIT_SUCCESS);
5546 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5547 (we handle buferring so as to have visibility of fill level). */
5551 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5552 if (expand_string_message)
5553 if (thismessage_size_limit == -1)
5554 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5555 "message_size_limit: %s", expand_string_message);
5557 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5558 "message_size_limit: %s", expand_string_message);
5560 setvbuf(stdin, NULL, _IONBF, 0);
5563 /* Loop for several messages when reading SMTP input. If we fork any child
5564 processes, we don't want to wait for them unless synchronous delivery is
5565 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5566 same as SIG_DFL, despite the fact that documentation often lists the default as
5567 "ignore". This is a confusing area. This is what I know:
5569 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5570 processes that complete simply to go away without ever becoming defunct. You
5571 can't then wait for them - but we don't want to wait for them in the
5572 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5573 happen for all OS (e.g. *BSD is different).
5575 But that's not the end of the story. Some (many? all?) systems have the
5576 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5577 has by default, so it seems that the difference is merely one of default
5578 (compare restarting vs non-restarting signals).
5580 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5581 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5582 of the loop below. Paranoia rules.
5584 February 2003: That's *still* not the end of the story. There are now versions
5585 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5586 process then calls waitpid(), a grumble is written to the system log, because
5587 this is logically inconsistent. In other words, it doesn't like the paranoia.
5588 As a consequence of this, the waitpid() below is now excluded if we are sure
5589 that SIG_IGN works. */
5591 if (!f.synchronous_delivery)
5594 struct sigaction act;
5595 act.sa_handler = SIG_IGN;
5596 sigemptyset(&(act.sa_mask));
5597 act.sa_flags = SA_NOCLDWAIT;
5598 sigaction(SIGCHLD, &act, NULL);
5600 signal(SIGCHLD, SIG_IGN);
5604 /* Save the current store pool point, for resetting at the start of
5605 each message, and save the real sender address, if any. */
5607 real_sender_address = sender_address;
5609 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5610 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5613 for (BOOL more = TRUE; more; )
5615 rmark reset_point = store_mark();
5618 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5619 input and build the recipients list, before calling receive_msg() to read the
5620 message proper. Whatever sender address is given in the SMTP transaction is
5621 often ignored for local senders - we use the actual sender, which is normally
5622 either the underlying user running this process or a -f argument provided by
5623 a trusted caller. It is saved in real_sender_address. The test for whether to
5624 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5629 if ((rc = smtp_setup_msg()) > 0)
5631 if (real_sender_address != NULL &&
5632 !receive_check_set_sender(sender_address))
5634 sender_address = raw_sender = real_sender_address;
5635 sender_address_unrewritten = NULL;
5638 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5639 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5640 the very end. The result of the ACL is ignored (as for other non-SMTP
5641 messages). It is run for its potential side effects. */
5643 if (smtp_batched_input && acl_not_smtp_start != NULL)
5645 uschar *user_msg, *log_msg;
5646 f.enable_dollar_recipients = TRUE;
5647 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5648 &user_msg, &log_msg);
5649 f.enable_dollar_recipients = FALSE;
5652 /* Now get the data for the message */
5654 more = receive_msg(extract_recipients);
5657 cancel_cutthrough_connection(TRUE, US"receive dropped");
5658 if (more) goto MORELOOP;
5659 smtp_log_no_mail(); /* Log no mail if configured */
5660 exim_exit(EXIT_FAILURE);
5665 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5666 smtp_log_no_mail(); /* Log no mail if configured */
5667 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5671 /* In the non-SMTP case, we have all the information from the command
5672 line, but must process it in case it is in the more general RFC822
5673 format, and in any case, to detect syntax errors. Also, it appears that
5674 the use of comma-separated lists as single arguments is common, so we
5675 had better support them. */
5680 int count = argc - recipients_arg;
5681 uschar **list = argv + recipients_arg;
5683 /* These options cannot be changed dynamically for non-SMTP messages */
5685 f.active_local_sender_retain = local_sender_retain;
5686 f.active_local_from_check = local_from_check;
5688 /* Save before any rewriting */
5690 raw_sender = string_copy(sender_address);
5692 /* Loop for each argument (supplied by user hence tainted) */
5694 for (int i = 0; i < count; i++)
5696 int start, end, domain;
5698 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5699 * We'll still want to cap it to something, just in case. */
5700 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5702 /* Loop for each comma-separated address */
5706 BOOL finished = FALSE;
5708 uschar *ss = parse_find_address_end(s, FALSE);
5710 if (*ss == ',') *ss = 0; else finished = TRUE;
5712 /* Check max recipients - if -t was used, these aren't recipients */
5714 if (recipients_max > 0 && ++rcount > recipients_max &&
5715 !extract_recipients)
5716 if (error_handling == ERRORS_STDERR)
5718 fprintf(stderr, "exim: too many recipients\n");
5719 exim_exit(EXIT_FAILURE);
5723 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5724 errors_sender_rc : EXIT_FAILURE;
5728 BOOL b = allow_utf8_domains;
5729 allow_utf8_domains = TRUE;
5732 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5736 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5737 else allow_utf8_domains = b;
5742 if (domain == 0 && !f.allow_unqualified_recipient)
5745 errmess = US"unqualified recipient address not allowed";
5749 if (error_handling == ERRORS_STDERR)
5751 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5752 string_printing(list[i]), errmess);
5753 exim_exit(EXIT_FAILURE);
5759 eblock.text1 = string_printing(list[i]);
5760 eblock.text2 = errmess;
5762 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5763 errors_sender_rc : EXIT_FAILURE;
5766 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5769 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5773 /* Show the recipients when debugging */
5777 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5778 if (recipients_list)
5780 debug_printf("Recipients:\n");
5781 for (int i = 0; i < recipients_count; i++)
5782 debug_printf(" %s\n", recipients_list[i].address);
5786 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5787 ignored; rejecting here would just add complication, and it can just as
5788 well be done later. Allow $recipients to be visible in the ACL. */
5790 if (acl_not_smtp_start)
5792 uschar *user_msg, *log_msg;
5793 f.enable_dollar_recipients = TRUE;
5794 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5795 &user_msg, &log_msg);
5796 f.enable_dollar_recipients = FALSE;
5799 /* Pause for a while waiting for input. If none received in that time,
5800 close the logfile, if we had one open; then if we wait for a long-running
5801 datasource (months, in one use-case) log rotation will not leave us holding
5804 if (!receive_timeout)
5805 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5808 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5809 will just read the headers for the message, and not write anything onto the
5812 message_ended = END_NOTENDED;
5813 more = receive_msg(extract_recipients);
5815 /* more is always FALSE here (not SMTP message) when reading a message
5816 for real; when reading the headers of a message for filter testing,
5817 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5819 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5820 } /* Non-SMTP message reception */
5822 /* If this is a filter testing run, there are headers in store, but
5823 no message on the spool. Run the filtering code in testing mode, setting
5824 the domain to the qualify domain and the local part to the current user,
5825 unless they have been set by options. The prefix and suffix are left unset
5826 unless specified. The the return path is set to to the sender unless it has
5827 already been set from a return-path header in the message. */
5829 if (filter_test != FTEST_NONE)
5831 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5832 deliver_domain_orig = deliver_domain;
5833 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5834 deliver_localpart_orig = deliver_localpart;
5835 deliver_localpart_prefix = US ftest_prefix;
5836 deliver_localpart_suffix = US ftest_suffix;
5837 deliver_home = originator_home;
5841 printf("Return-path copied from sender\n");
5842 return_path = string_copy(sender_address);
5845 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5846 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5848 receive_add_recipient(
5849 string_sprintf("%s%s%s@%s",
5850 ftest_prefix ? ftest_prefix : US"",
5852 ftest_suffix ? ftest_suffix : US"",
5853 deliver_domain), -1);
5855 printf("Recipient = %s\n", recipients_list[0].address);
5856 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5857 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5859 if (chdir("/")) /* Get away from wherever the user is running this from */
5861 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5862 exim_exit(EXIT_FAILURE);
5865 /* Now we run either a system filter test, or a user filter test, or both.
5866 In the latter case, headers added by the system filter will persist and be
5867 available to the user filter. We need to copy the filter variables
5870 if (filter_test & FTEST_SYSTEM)
5871 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5872 exim_exit(EXIT_FAILURE);
5874 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5876 if (filter_test & FTEST_USER)
5877 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5878 exim_exit(EXIT_FAILURE);
5880 exim_exit(EXIT_SUCCESS);
5883 /* Else act on the result of message reception. We should not get here unless
5884 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5885 will be TRUE. If it is not, check on the number of messages received in this
5888 if ( !session_local_queue_only
5889 && smtp_accept_queue_per_connection > 0
5890 && receive_messagecount > smtp_accept_queue_per_connection)
5892 session_local_queue_only = TRUE;
5893 queue_only_reason = 2;
5896 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5897 and queue_only_load is set, check that the load average is below it. If it is
5898 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5899 default), we put the whole session into queue_only mode. It then remains this
5900 way for any subsequent messages on the same SMTP connection. This is a
5901 deliberate choice; even though the load average may fall, it doesn't seem
5902 right to deliver later messages on the same call when not delivering earlier
5903 ones. However, there are odd cases where this is not wanted, so this can be
5904 changed by setting queue_only_load_latch false. */
5906 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5907 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5909 queue_only_reason = 3;
5910 if (queue_only_load_latch) session_local_queue_only = TRUE;
5913 /* If running as an MUA wrapper, all queueing options and freezing options
5917 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5919 /* Log the queueing here, when it will get a message id attached, but
5920 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5923 if (local_queue_only)
5925 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5926 switch(queue_only_reason)
5929 log_write(L_delay_delivery,
5930 LOG_MAIN, "no immediate delivery: more than %d messages "
5931 "received in one connection", smtp_accept_queue_per_connection);
5935 log_write(L_delay_delivery,
5936 LOG_MAIN, "no immediate delivery: load average %.2f",
5937 (double)load_average/1000.0);
5942 else if (f.queue_only_policy || f.deliver_freeze)
5943 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5945 /* Else do the delivery unless the ACL or local_scan() called for queue only
5946 or froze the message. Always deliver in a separate process. A fork failure is
5947 not a disaster, as the delivery will eventually happen on a subsequent queue
5948 run. The search cache must be tidied before the fork, as the parent will
5949 do it before exiting. The child will trigger a lookup failure and
5950 thereby defer the delivery if it tries to use (for example) a cached ldap
5951 connection that the parent has called unbind on. */
5958 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5961 close_unwanted(); /* Close unwanted file descriptors and TLS */
5962 exim_nullstd(); /* Ensure std{in,out,err} exist */
5964 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5965 mode, deliver_drop_privilege is forced TRUE). */
5967 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5969 delivery_re_exec(CEE_EXEC_EXIT);
5970 /* Control does not return here. */
5973 /* No need to re-exec */
5975 rc = deliver_message(message_id, FALSE, FALSE);
5977 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5978 ? EXIT_SUCCESS : EXIT_FAILURE);
5983 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5984 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5985 "process: %s", strerror(errno));
5989 release_cutthrough_connection(US"msg passed for delivery");
5991 /* In the parent, wait if synchronous delivery is required. This will
5992 always be the case in MUA wrapper mode. */
5994 if (f.synchronous_delivery)
5997 while (wait(&status) != pid);
5998 if ((status & 0x00ff) != 0)
5999 log_write(0, LOG_MAIN|LOG_PANIC,
6000 "process %d crashed with signal %d while delivering %s",
6001 (int)pid, status & 0x00ff, message_id);
6002 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6007 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6008 automatically reaps children (see comments above the loop), clear away any
6009 finished subprocesses here, in case there are lots of messages coming in
6010 from the same source. */
6012 #ifndef SIG_IGN_WORKS
6013 while (waitpid(-1, NULL, WNOHANG) > 0);
6017 return_path = sender_address = NULL;
6018 authenticated_sender = NULL;
6019 deliver_localpart_orig = NULL;
6020 deliver_domain_orig = NULL;
6021 deliver_host = deliver_host_address = NULL;
6022 dnslist_domain = dnslist_matched = NULL;
6023 #ifdef WITH_CONTENT_SCAN
6024 malware_name = NULL;
6026 callout_address = NULL;
6027 sending_ip_address = NULL;
6028 deliver_localpart_data = deliver_domain_data =
6029 recipient_data = sender_data = NULL;
6031 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6033 store_reset(reset_point);
6036 exim_exit(EXIT_SUCCESS); /* Never returns */
6037 return 0; /* To stop compiler warning */