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 #if defined(EXPERIMENTAL_SRS_ALT)
1125 g = string_cat(g, US" Experimental_SRS");
1127 g = string_cat(g, US"\n");
1129 g = string_cat(g, US"Lookups (built-in):");
1130 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1131 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1133 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1134 g = string_cat(g, US" cdb");
1136 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1137 g = string_cat(g, US" dbm dbmjz dbmnz");
1139 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1140 g = string_cat(g, US" dnsdb");
1142 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1143 g = string_cat(g, US" dsearch");
1145 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1146 g = string_cat(g, US" ibase");
1148 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1149 g = string_cat(g, US" json");
1151 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1152 g = string_cat(g, US" ldap ldapdn ldapm");
1155 g = string_cat(g, US" lmdb");
1157 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1158 g = string_cat(g, US" mysql");
1160 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1161 g = string_cat(g, US" nis nis0");
1163 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1164 g = string_cat(g, US" nisplus");
1166 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1167 g = string_cat(g, US" oracle");
1169 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1170 g = string_cat(g, US" passwd");
1172 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1173 g = string_cat(g, US" pgsql");
1175 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1176 g = string_cat(g, US" redis");
1178 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1179 g = string_cat(g, US" sqlite");
1181 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1182 g = string_cat(g, US" testdb");
1184 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1185 g = string_cat(g, US" whoson");
1187 g = string_cat(g, US"\n");
1189 g = auth_show_supported(g);
1190 g = route_show_supported(g);
1191 g = transport_show_supported(g);
1193 #ifdef WITH_CONTENT_SCAN
1194 g = malware_show_supported(g);
1196 show_string(is_stdout, g); g = NULL;
1198 if (fixed_never_users[0] > 0)
1201 g = string_cat(g, US"Fixed never_users: ");
1202 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1203 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1204 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1207 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1209 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1211 /* Everything else is details which are only worth reporting when debugging.
1212 Perhaps the tls_version_report should move into this too. */
1216 /* clang defines __GNUC__ (at least, for me) so test for it first */
1217 #if defined(__clang__)
1218 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1219 #elif defined(__GNUC__)
1220 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1224 "? unknown version ?"
1228 g = string_cat(g, US"Compiler: <unknown>\n");
1231 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1232 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1233 __GLIBC__, __GLIBC_MINOR__);
1234 if (__GLIBC_PREREQ(2, 1))
1235 g = string_fmt_append(g, " Runtime: %s\n",
1236 gnu_get_libc_version());
1239 g = show_db_version(g);
1242 g = tls_version_report(g);
1245 g = utf8_version_report(g);
1247 #ifdef SUPPORT_DMARC
1248 g = dmarc_version_report(g);
1251 g = spf_lib_version_report(g);
1254 show_string(is_stdout, g);
1257 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1258 if (authi->version_report)
1259 g = (*authi->version_report)(g);
1261 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1262 characters; unless it's an ancient version of PCRE in which case it
1264 #ifndef PCRE_PRERELEASE
1265 # define PCRE_PRERELEASE
1268 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1271 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1272 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1274 PCRE2_MAJOR, PCRE2_MINOR,
1275 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1279 #undef EXPAND_AND_QUOTE
1281 show_string(is_stdout, g);
1285 for (int i = 0; i < lookup_list_count; i++)
1286 if (lookup_list[i]->version_report)
1287 g = lookup_list[i]->version_report(g);
1288 show_string(is_stdout, g);
1291 #ifdef WHITELIST_D_MACROS
1292 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1294 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1296 #ifdef TRUSTED_CONFIG_LIST
1297 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1299 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1303 show_string(is_stdout, g);
1304 store_reset(reset_point);
1308 /*************************************************
1309 * Show auxiliary information about Exim *
1310 *************************************************/
1313 show_exim_information(enum commandline_info request, FILE *stream)
1318 fprintf(stream, "Oops, something went wrong.\n");
1322 "The -bI: flag takes a string indicating which information to provide.\n"
1323 "If the string is not recognised, you'll get this help (on stderr).\n"
1325 " exim -bI:help this information\n"
1326 " exim -bI:dscp list of known dscp value keywords\n"
1327 " exim -bI:sieve list of supported sieve extensions\n"
1331 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1332 fprintf(stream, "%s\n", *pp);
1335 dscp_list_to_stream(stream);
1341 /*************************************************
1342 * Quote a local part *
1343 *************************************************/
1345 /* This function is used when a sender address or a From: or Sender: header
1346 line is being created from the caller's login, or from an authenticated_id. It
1347 applies appropriate quoting rules for a local part.
1349 Argument: the local part
1350 Returns: the local part, quoted if necessary
1354 local_part_quote(uschar *lpart)
1356 BOOL needs_quote = FALSE;
1359 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1361 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1362 (*t != '.' || t == lpart || t[1] == 0);
1365 if (!needs_quote) return lpart;
1367 g = string_catn(NULL, US"\"", 1);
1371 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1374 g = string_cat(g, lpart);
1377 g = string_catn(g, lpart, nq - lpart);
1378 g = string_catn(g, US"\\", 1);
1379 g = string_catn(g, nq, 1);
1383 g = string_catn(g, US"\"", 1);
1384 return string_from_gstring(g);
1390 /*************************************************
1391 * Load readline() functions *
1392 *************************************************/
1394 /* This function is called from testing executions that read data from stdin,
1395 but only when running as the calling user. Currently, only -be does this. The
1396 function loads the readline() function library and passes back the functions.
1397 On some systems, it needs the curses library, so load that too, but try without
1398 it if loading fails. All this functionality has to be requested at build time.
1401 fn_readline_ptr pointer to where to put the readline pointer
1402 fn_addhist_ptr pointer to where to put the addhistory function
1404 Returns: the dlopen handle or NULL on failure
1408 set_readline(char * (**fn_readline_ptr)(const char *),
1409 void (**fn_addhist_ptr)(const char *))
1412 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1414 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1415 if (dlhandle_curses) dlclose(dlhandle_curses);
1419 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1420 * char * readline (const char *prompt);
1421 * void add_history (const char *string);
1423 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1424 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1427 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1435 /*************************************************
1436 * Get a line from stdin for testing things *
1437 *************************************************/
1439 /* This function is called when running tests that can take a number of lines
1440 of input (for example, -be and -bt). It handles continuations and trailing
1441 spaces. And prompting and a blank line output on eof. If readline() is in use,
1442 the arguments are non-NULL and provide the relevant functions.
1445 fn_readline readline function or NULL
1446 fn_addhist addhist function or NULL
1448 Returns: pointer to dynamic memory, or NULL at end of file
1452 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1455 BOOL had_input = FALSE;
1457 if (!fn_readline) { printf("> "); fflush(stdout); }
1459 for (int i = 0;; i++)
1461 uschar buffer[1024];
1465 char *readline_line = NULL;
1468 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1469 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1470 p = US readline_line;
1475 /* readline() not in use */
1478 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1482 /* Handle the line */
1485 ss = p + Ustrlen(p);
1486 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1489 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1491 g = string_catn(g, p, ss - p);
1494 if (fn_readline) free(readline_line);
1497 /* g can only be NULL if ss==p */
1498 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1501 --g->ptr; /* drop the \ */
1504 if (had_input) return g ? string_from_gstring(g) : US"";
1511 /*************************************************
1512 * Output usage information for the program *
1513 *************************************************/
1515 /* This function is called when there are no recipients
1516 or a specific --help argument was added.
1519 progname information on what name we were called by
1521 Returns: DOES NOT RETURN
1525 exim_usage(uschar *progname)
1528 /* Handle specific program invocation variants */
1529 if (Ustrcmp(progname, US"-mailq") == 0)
1531 "mailq - list the contents of the mail queue\n\n"
1532 "For a list of options, see the Exim documentation.\n");
1534 /* Generic usage - we output this whatever happens */
1536 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1537 "not directly from a shell command line. Options and/or arguments control\n"
1538 "what it does when called. For a list of options, see the Exim documentation.\n");
1543 /*************************************************
1544 * Validate that the macros given are okay *
1545 *************************************************/
1547 /* Typically, Exim will drop privileges if macros are supplied. In some
1548 cases, we want to not do so.
1550 Arguments: opt_D_used - true if the commandline had a "-D" option
1551 Returns: true if trusted, false otherwise
1555 macros_trusted(BOOL opt_D_used)
1557 #ifdef WHITELIST_D_MACROS
1558 uschar *whitelisted, *end, *p, **whites;
1559 int white_count, i, n;
1561 BOOL prev_char_item, found;
1566 #ifndef WHITELIST_D_MACROS
1570 /* We only trust -D overrides for some invoking users:
1571 root, the exim run-time user, the optional config owner user.
1572 I don't know why config-owner would be needed, but since they can own the
1573 config files anyway, there's no security risk to letting them override -D. */
1574 if ( ! ((real_uid == root_uid)
1575 || (real_uid == exim_uid)
1576 #ifdef CONFIGURE_OWNER
1577 || (real_uid == config_uid)
1581 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1585 /* Get a list of macros which are whitelisted */
1586 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1587 prev_char_item = FALSE;
1589 for (p = whitelisted; *p != '\0'; ++p)
1591 if (*p == ':' || isspace(*p))
1596 prev_char_item = FALSE;
1599 if (!prev_char_item)
1600 prev_char_item = TRUE;
1607 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1608 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1613 if (i == white_count)
1615 while (*p != '\0' && p < end)
1621 /* The list of commandline macros should be very short.
1622 Accept the N*M complexity. */
1623 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1626 for (uschar ** w = whites; *w; ++w)
1627 if (Ustrcmp(*w, m->name) == 0)
1634 if (!m->replacement)
1636 if ((len = m->replen) == 0)
1638 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1641 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1647 /*************************************************
1648 * Expansion testing *
1649 *************************************************/
1651 /* Expand and print one item, doing macro-processing.
1654 item line for expansion
1658 expansion_test_line(const uschar * line)
1664 Ustrncpy(big_buffer, line, big_buffer_size);
1665 big_buffer[big_buffer_size-1] = '\0';
1666 len = Ustrlen(big_buffer);
1668 (void) macros_expand(0, &len, &dummy_macexp);
1670 if (isupper(big_buffer[0]))
1672 if (macro_read_assignment(big_buffer))
1673 printf("Defined macro '%s'\n", mlast->name);
1676 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1677 else printf("Failed: %s\n", expand_string_message);
1682 /*************************************************
1683 * Entry point and high-level code *
1684 *************************************************/
1686 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1687 the appropriate action. All the necessary functions are present in the one
1688 binary. I originally thought one should split it up, but it turns out that so
1689 much of the apparatus is needed in each chunk that one might as well just have
1690 it all available all the time, which then makes the coding easier as well.
1693 argc count of entries in argv
1694 argv argument strings, with argv[0] being the program name
1696 Returns: EXIT_SUCCESS if terminated successfully
1697 EXIT_FAILURE otherwise, except when a message has been sent
1698 to the sender, and -oee was given
1702 main(int argc, char **cargv)
1704 uschar **argv = USS cargv;
1705 int arg_receive_timeout = -1;
1706 int arg_smtp_receive_timeout = -1;
1707 int arg_error_handling = error_handling;
1708 int filter_sfd = -1;
1709 int filter_ufd = -1;
1712 int list_queue_option = 0;
1714 int msg_action_arg = -1;
1715 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1716 int queue_only_reason = 0;
1718 int perl_start_option = 0;
1720 int recipients_arg = argc;
1721 int sender_address_domain = 0;
1722 int test_retry_arg = -1;
1723 int test_rewrite_arg = -1;
1724 gid_t original_egid;
1725 BOOL arg_queue_only = FALSE;
1726 BOOL bi_option = FALSE;
1727 BOOL checking = FALSE;
1728 BOOL count_queue = FALSE;
1729 BOOL expansion_test = FALSE;
1730 BOOL extract_recipients = FALSE;
1731 BOOL flag_G = FALSE;
1732 BOOL flag_n = FALSE;
1733 BOOL forced_delivery = FALSE;
1734 BOOL f_end_dot = FALSE;
1735 BOOL deliver_give_up = FALSE;
1736 BOOL list_queue = FALSE;
1737 BOOL list_options = FALSE;
1738 BOOL list_config = FALSE;
1739 BOOL local_queue_only;
1740 BOOL one_msg_action = FALSE;
1741 BOOL opt_D_used = FALSE;
1742 BOOL queue_only_set = FALSE;
1743 BOOL receiving_message = TRUE;
1744 BOOL sender_ident_set = FALSE;
1745 BOOL session_local_queue_only;
1747 BOOL removed_privilege = FALSE;
1748 BOOL usage_wanted = FALSE;
1749 BOOL verify_address_mode = FALSE;
1750 BOOL verify_as_sender = FALSE;
1751 BOOL rcpt_verify_quota = FALSE;
1752 BOOL version_printed = FALSE;
1753 uschar *alias_arg = NULL;
1754 uschar *called_as = US"";
1755 uschar *cmdline_syslog_name = NULL;
1756 uschar *start_queue_run_id = NULL;
1757 uschar *stop_queue_run_id = NULL;
1758 uschar *expansion_test_message = NULL;
1759 const uschar *ftest_domain = NULL;
1760 const uschar *ftest_localpart = NULL;
1761 const uschar *ftest_prefix = NULL;
1762 const uschar *ftest_suffix = NULL;
1763 uschar *log_oneline = NULL;
1764 uschar *malware_test_file = NULL;
1765 uschar *real_sender_address;
1766 uschar *originator_home = US"/";
1770 struct stat statbuf;
1771 pid_t passed_qr_pid = (pid_t)0;
1772 int passed_qr_pipe = -1;
1773 gid_t group_list[EXIM_GROUPLIST_SIZE];
1775 /* For the -bI: flag */
1776 enum commandline_info info_flag = CMDINFO_NONE;
1777 BOOL info_stdout = FALSE;
1779 /* Possible options for -R and -S */
1781 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1783 /* Need to define this in case we need to change the environment in order
1784 to get rid of a bogus time zone. We have to make it char rather than uschar
1785 because some OS define it in /usr/include/unistd.h. */
1787 extern char **environ;
1789 #ifdef MEASURE_TIMING
1790 (void)gettimeofday(×tamp_startup, NULL);
1793 store_init(); /* Initialise the memory allocation susbsystem */
1794 pcre_init(); /* Set up memory handling for pcre */
1796 /* If the Exim user and/or group and/or the configuration file owner/group were
1797 defined by ref:name at build time, we must now find the actual uid/gid values.
1798 This is a feature to make the lives of binary distributors easier. */
1800 #ifdef EXIM_USERNAME
1801 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1804 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1806 /* If ref:name uses a number as the name, route_finduser() returns
1807 TRUE with exim_uid set and pw coerced to NULL. */
1809 exim_gid = pw->pw_gid;
1810 #ifndef EXIM_GROUPNAME
1813 "exim: ref:name should specify a usercode, not a group.\n"
1814 "exim: can't let you get away with it unless you also specify a group.\n");
1818 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1821 #ifdef EXIM_GROUPNAME
1822 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1823 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1826 #ifdef CONFIGURE_OWNERNAME
1827 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1828 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1829 CONFIGURE_OWNERNAME);
1832 /* We default the system_filter_user to be the Exim run-time user, as a
1833 sane non-root value. */
1834 system_filter_uid = exim_uid;
1836 #ifdef CONFIGURE_GROUPNAME
1837 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1838 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1839 CONFIGURE_GROUPNAME);
1842 /* In the Cygwin environment, some initialization used to need doing.
1843 It was fudged in by means of this macro; now no longer but we'll leave
1844 it in case of others. */
1850 /* Check a field which is patched when we are running Exim within its
1851 testing harness; do a fast initial check, and then the whole thing. */
1853 f.running_in_test_harness =
1854 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1855 if (f.running_in_test_harness)
1858 /* Protect against abusive argv[0] */
1859 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1860 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1862 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1863 at the start of a program; however, it seems that some environments do not
1864 follow this. A "strange" locale can affect the formatting of timestamps, so we
1867 setlocale(LC_ALL, "C");
1869 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1871 #ifdef _POSIX_MONOTONIC_CLOCK
1875 /* Set up the default handler for timing using alarm(). */
1877 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1879 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1880 because store_malloc writes a log entry on failure. */
1882 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1883 exim_fail("exim: failed to get store for log buffer\n");
1885 /* Initialize the default log options. */
1887 bits_set(log_selector, log_selector_size, log_default);
1889 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1890 NULL when the daemon is run and the file is closed. We have to use this
1891 indirection, because some systems don't allow writing to the variable "stderr".
1894 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1896 /* Ensure there is a big buffer for temporary use in several places. It is put
1897 in malloc store so that it can be freed for enlargement if necessary. */
1899 big_buffer = store_malloc(big_buffer_size);
1901 /* Set up the handler for the data request signal, and set the initial
1902 descriptive text. */
1904 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1905 set_process_info("initializing");
1906 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1909 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1910 sigaction(SIGSEGV, &act, NULL);
1913 signal(SIGSEGV, segv_handler); /* log faults */
1916 /* If running in a dockerized environment, the TERM signal is only
1917 delegated to the PID 1 if we request it by setting an signal handler */
1918 if (getpid() == 1) signal(SIGTERM, term_handler);
1920 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1921 in the daemon code. For the rest of Exim's uses, we ignore it. */
1923 signal(SIGHUP, SIG_IGN);
1925 /* We don't want to die on pipe errors as the code is written to handle
1926 the write error instead. */
1928 signal(SIGPIPE, SIG_IGN);
1930 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1931 set to SIG_IGN. This causes subprocesses that complete before the parent
1932 process waits for them not to hang around, so when Exim calls wait(), nothing
1933 is there. The wait() code has been made robust against this, but let's ensure
1934 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1935 ending status. We use sigaction rather than plain signal() on those OS where
1936 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1937 problem on AIX with this.) */
1941 struct sigaction act;
1942 act.sa_handler = SIG_DFL;
1943 sigemptyset(&(act.sa_mask));
1945 sigaction(SIGCHLD, &act, NULL);
1948 signal(SIGCHLD, SIG_DFL);
1951 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1956 /* Set up the version number. Set up the leading 'E' for the external form of
1957 message ids, set the pointer to the internal form, and initialize it to
1958 indicate no message being processed. */
1961 message_id_option[0] = '-';
1962 message_id_external = message_id_option + 1;
1963 message_id_external[0] = 'E';
1964 message_id = message_id_external + 1;
1967 /* Set the umask to zero so that any files Exim creates using open() are
1968 created with the modes that it specifies. NOTE: Files created with fopen() have
1969 a problem, which was not recognized till rather late (February 2006). With this
1970 umask, such files will be world writeable. (They are all content scanning files
1971 in the spool directory, which isn't world-accessible, so this is not a
1972 disaster, but it's untidy.) I don't want to change this overall setting,
1973 however, because it will interact badly with the open() calls. Instead, there's
1974 now a function called modefopen() that fiddles with the umask while calling
1979 /* Precompile the regular expression for matching a message id. Keep this in
1980 step with the code that generates ids in the accept.c module. We need to do
1981 this here, because the -M options check their arguments for syntactic validity
1982 using mac_ismsgid, which uses this. */
1985 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1987 /* Precompile the regular expression that is used for matching an SMTP error
1988 code, possibly extended, at the start of an error message. Note that the
1989 terminating whitespace character is included. */
1992 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1995 #ifdef WHITELIST_D_MACROS
1996 /* Precompile the regular expression used to filter the content of macros
1997 given to -D for permissibility. */
1999 regex_whitelisted_macro =
2000 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
2003 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
2005 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2006 this seems to be a generally accepted convention, since one finds symbolic
2007 links called "mailq" in standard OS configurations. */
2009 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2010 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2013 receiving_message = FALSE;
2014 called_as = US"-mailq";
2017 /* If the program is called as "rmail" treat it as equivalent to
2018 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2019 i.e. preventing a single dot on a line from terminating the message, and
2020 returning with zero return code, even in cases of error (provided an error
2021 message has been sent). */
2023 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2024 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2027 called_as = US"-rmail";
2028 errors_sender_rc = EXIT_SUCCESS;
2031 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2032 this is a smail convention. */
2034 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2035 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2037 smtp_input = smtp_batched_input = TRUE;
2038 called_as = US"-rsmtp";
2041 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2042 this is a smail convention. */
2044 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2045 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2048 receiving_message = FALSE;
2049 called_as = US"-runq";
2052 /* If the program is called as "newaliases" treat it as equivalent to
2053 "exim -bi"; this is a sendmail convention. */
2055 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2056 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2059 receiving_message = FALSE;
2060 called_as = US"-newaliases";
2063 /* Save the original effective uid for a couple of uses later. It should
2064 normally be root, but in some esoteric environments it may not be. */
2066 original_euid = geteuid();
2067 original_egid = getegid();
2069 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2070 to be the same as the real ones. This makes a difference only if Exim is setuid
2071 (or setgid) to something other than root, which could be the case in some
2072 special configurations. */
2074 real_uid = getuid();
2075 real_gid = getgid();
2077 if (real_uid == root_uid)
2079 if ((rv = setgid(real_gid)))
2080 exim_fail("exim: setgid(%ld) failed: %s\n",
2081 (long int)real_gid, strerror(errno));
2082 if ((rv = setuid(real_uid)))
2083 exim_fail("exim: setuid(%ld) failed: %s\n",
2084 (long int)real_uid, strerror(errno));
2087 /* If neither the original real uid nor the original euid was root, Exim is
2088 running in an unprivileged state. */
2090 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2092 /* For most of the args-parsing we need to use permanent pool memory */
2094 int old_pool = store_pool;
2095 store_pool = POOL_PERM;
2097 /* Scan the program's arguments. Some can be dealt with right away; others are
2098 simply recorded for checking and handling afterwards. Do a high-level switch
2099 on the second character (the one after '-'), to save some effort. */
2101 for (i = 1; i < argc; i++)
2103 BOOL badarg = FALSE;
2104 uschar * arg = argv[i];
2108 /* An argument not starting with '-' is the start of a recipients list;
2109 break out of the options-scanning loop. */
2117 /* An option consisting of -- terminates the options */
2119 if (Ustrcmp(arg, "--") == 0)
2121 recipients_arg = i + 1;
2125 /* Handle flagged options */
2127 switchchar = arg[1];
2130 /* Make all -ex options synonymous with -oex arguments, since that
2131 is assumed by various callers. Also make -qR options synonymous with -R
2132 options, as that seems to be required as well. Allow for -qqR too, and
2133 the same for -S options. */
2135 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2136 Ustrncmp(arg+1, "qR", 2) == 0 ||
2137 Ustrncmp(arg+1, "qS", 2) == 0)
2139 switchchar = arg[2];
2142 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2144 switchchar = arg[3];
2146 f.queue_2stage = TRUE;
2149 /* Make -r synonymous with -f, since it is a documented alias */
2151 else if (arg[1] == 'r') switchchar = 'f';
2153 /* Make -ov synonymous with -v */
2155 else if (Ustrcmp(arg, "-ov") == 0)
2161 /* deal with --option_aliases */
2162 else if (switchchar == '-')
2164 if (Ustrcmp(argrest, "help") == 0)
2166 usage_wanted = TRUE;
2169 else if (Ustrcmp(argrest, "version") == 0)
2176 /* High-level switch on active initial letter */
2181 /* sendmail uses -Ac and -Am to control which .cf file is used;
2184 if (!*argrest) { badarg = TRUE; break; }
2187 BOOL ignore = FALSE;
2192 if (*(argrest + 1) == '\0')
2196 if (!ignore) badarg = TRUE;
2200 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2201 so has no need of it. */
2204 if (!*argrest) i++; /* Skip over the type */
2210 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2214 /* -bd: Run in daemon mode, awaiting SMTP connections.
2215 -bdf: Ditto, but in the foreground.
2218 f.daemon_listen = TRUE;
2219 if (*argrest == 'f') f.background_daemon = FALSE;
2220 else if (*argrest) badarg = TRUE;
2223 /* -be: Run in expansion test mode
2224 -bem: Ditto, but read a message from a file first
2227 expansion_test = checking = TRUE;
2228 if (*argrest == 'm')
2230 if (++i >= argc) { badarg = TRUE; break; }
2231 expansion_test_message = argv[i];
2234 if (*argrest) badarg = TRUE;
2237 /* -bF: Run system filter test */
2239 filter_test |= checking = FTEST_SYSTEM;
2240 if (*argrest) badarg = TRUE;
2241 else if (++i < argc) filter_test_sfile = argv[i];
2242 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2245 /* -bf: Run user filter test
2246 -bfd: Set domain for filter testing
2247 -bfl: Set local part for filter testing
2248 -bfp: Set prefix for filter testing
2249 -bfs: Set suffix for filter testing
2254 filter_test |= checking = FTEST_USER;
2255 if (++i < argc) filter_test_ufile = argv[i];
2256 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2261 exim_fail("exim: string expected after %s\n", arg);
2262 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2263 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2264 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2265 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2270 /* -bh: Host checking - an IP address must follow. */
2272 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2274 if (++i >= argc) { badarg = TRUE; break; }
2275 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2276 host_checking = checking = f.log_testing_mode = TRUE;
2277 f.host_checking_callout = *argrest == 'c';
2278 message_logs = FALSE;
2283 /* -bi: This option is used by sendmail to initialize *the* alias file,
2284 though it has the -oA option to specify a different file. Exim has no
2285 concept of *the* alias file, but since Sun's YP make script calls
2286 sendmail this way, some support must be provided. */
2288 if (!*argrest) bi_option = TRUE;
2292 /* -bI: provide information, of the type to follow after a colon.
2293 This is an Exim flag. */
2295 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2297 uschar *p = argrest+1;
2298 info_flag = CMDINFO_HELP;
2300 if (strcmpic(p, CUS"sieve") == 0)
2302 info_flag = CMDINFO_SIEVE;
2305 else if (strcmpic(p, CUS"dscp") == 0)
2307 info_flag = CMDINFO_DSCP;
2310 else if (strcmpic(p, CUS"help") == 0)
2316 /* -bm: Accept and deliver message - the default option. Reinstate
2317 receiving_message, which got turned off for all -b options.
2318 -bmalware: test the filename given for malware */
2320 if (!*argrest) receiving_message = TRUE;
2321 else if (Ustrcmp(argrest, "alware") == 0)
2323 if (++i >= argc) { badarg = TRUE; break; }
2325 malware_test_file = argv[i];
2330 /* -bnq: For locally originating messages, do not qualify unqualified
2331 addresses. In the envelope, this causes errors; in header lines they
2334 if (Ustrcmp(argrest, "q") == 0)
2336 f.allow_unqualified_sender = FALSE;
2337 f.allow_unqualified_recipient = FALSE;
2342 /* -bpxx: List the contents of the mail queue, in various forms. If
2343 the option is -bpc, just a queue count is needed. Otherwise, if the
2344 first letter after p is r, then order is random. */
2346 if (*argrest == 'c')
2349 if (*++argrest) badarg = TRUE;
2353 if (*argrest == 'r')
2355 list_queue_option = 8;
2358 else list_queue_option = 0;
2362 /* -bp: List the contents of the mail queue, top-level only */
2366 /* -bpu: List the contents of the mail queue, top-level undelivered */
2368 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2370 /* -bpa: List the contents of the mail queue, including all delivered */
2372 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2374 /* Unknown after -bp[r] */
2380 /* -bP: List the configuration variables given as the address list.
2381 Force -v, so configuration errors get displayed. */
2384 /* -bP config: we need to setup here, because later,
2385 when list_options is checked, the config is read already */
2388 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2391 readconf_save_config(version_string);
2395 list_options = TRUE;
2396 debug_selector |= D_v;
2397 debug_file = stderr;
2401 /* -brt: Test retry configuration lookup */
2403 if (Ustrcmp(argrest, "t") == 0)
2406 test_retry_arg = i + 1;
2410 /* -brw: Test rewrite configuration */
2412 else if (Ustrcmp(argrest, "w") == 0)
2415 test_rewrite_arg = i + 1;
2421 /* -bS: Read SMTP commands on standard input, but produce no replies -
2422 all errors are reported by sending messages. */
2425 smtp_input = smtp_batched_input = receiving_message = TRUE;
2429 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2430 on standard output. */
2432 if (!*argrest) smtp_input = receiving_message = TRUE;
2436 /* -bt: address testing mode */
2439 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2443 /* -bv: verify addresses */
2446 verify_address_mode = checking = f.log_testing_mode = TRUE;
2448 /* -bvs: verify sender addresses */
2450 else if (Ustrcmp(argrest, "s") == 0)
2452 verify_address_mode = checking = f.log_testing_mode = TRUE;
2453 verify_as_sender = TRUE;
2458 /* -bV: Print version string and support details */
2462 printf("Exim version %s #%s built %s\n", version_string,
2463 version_cnumber, version_date);
2464 printf("%s\n", CS version_copyright);
2465 version_printed = TRUE;
2466 show_whats_supported(TRUE);
2467 f.log_testing_mode = TRUE;
2472 /* -bw: inetd wait mode, accept a listening socket as stdin */
2474 f.inetd_wait_mode = TRUE;
2475 f.background_daemon = FALSE;
2476 f.daemon_listen = TRUE;
2478 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2479 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2490 /* -C: change configuration file list; ignore if it isn't really
2491 a change! Enforce a prefix check if required. */
2495 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2496 if (Ustrcmp(config_main_filelist, argrest) != 0)
2498 #ifdef ALT_CONFIG_PREFIX
2500 int len = Ustrlen(ALT_CONFIG_PREFIX);
2501 const uschar *list = argrest;
2503 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2504 while((filename = string_nextinlist(&list, &sep, big_buffer,
2506 if ( ( Ustrlen(filename) < len
2507 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2508 || Ustrstr(filename, "/../") != NULL
2510 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2512 exim_fail("-C Permission denied\n");
2514 if (real_uid != root_uid)
2516 #ifdef TRUSTED_CONFIG_LIST
2518 if (real_uid != exim_uid
2519 #ifdef CONFIGURE_OWNER
2520 && real_uid != config_uid
2523 f.trusted_config = FALSE;
2526 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2529 struct stat statbuf;
2531 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2532 (statbuf.st_uid != root_uid /* owner not root */
2533 #ifdef CONFIGURE_OWNER
2534 && statbuf.st_uid != config_uid /* owner not the special one */
2537 (statbuf.st_gid != root_gid /* group not root */
2538 #ifdef CONFIGURE_GROUP
2539 && statbuf.st_gid != config_gid /* group not the special one */
2541 && (statbuf.st_mode & 020) != 0 /* group writeable */
2543 (statbuf.st_mode & 2) != 0) /* world writeable */
2545 f.trusted_config = FALSE;
2550 /* Well, the trust list at least is up to scratch... */
2552 uschar *trusted_configs[32];
2555 int old_pool = store_pool;
2556 store_pool = POOL_MAIN;
2558 reset_point = store_mark();
2559 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2561 uschar *start = big_buffer, *nl;
2562 while (*start && isspace(*start))
2566 nl = Ustrchr(start, '\n');
2569 trusted_configs[nr_configs++] = string_copy(start);
2570 if (nr_configs == nelem(trusted_configs))
2578 const uschar *list = argrest;
2580 while (f.trusted_config && (filename = string_nextinlist(&list,
2581 &sep, big_buffer, big_buffer_size)))
2583 for (i=0; i < nr_configs; i++)
2584 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2586 if (i == nr_configs)
2588 f.trusted_config = FALSE;
2593 else /* No valid prefixes found in trust_list file. */
2594 f.trusted_config = FALSE;
2595 store_reset(reset_point);
2596 store_pool = old_pool;
2599 else /* Could not open trust_list file. */
2600 f.trusted_config = FALSE;
2603 /* Not root; don't trust config */
2604 f.trusted_config = FALSE;
2608 config_main_filelist = argrest;
2609 f.config_changed = TRUE;
2614 /* -D: set up a macro definition */
2617 #ifdef DISABLE_D_OPTION
2618 exim_fail("exim: -D is not available in this Exim binary\n");
2624 uschar *s = argrest;
2627 while (isspace(*s)) s++;
2629 if (*s < 'A' || *s > 'Z')
2630 exim_fail("exim: macro name set by -D must start with "
2631 "an upper case letter\n");
2633 while (isalnum(*s) || *s == '_')
2635 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2639 if (ptr == 0) { badarg = TRUE; break; }
2640 while (isspace(*s)) s++;
2643 if (*s++ != '=') { badarg = TRUE; break; }
2644 while (isspace(*s)) s++;
2647 for (m = macros_user; m; m = m->next)
2648 if (Ustrcmp(m->name, name) == 0)
2649 exim_fail("exim: duplicated -D in command line\n");
2651 m = macro_create(name, s, TRUE);
2653 if (clmacro_count >= MAX_CLMACROS)
2654 exim_fail("exim: too many -D options on command line\n");
2655 clmacros[clmacro_count++] =
2656 string_sprintf("-D%s=%s", m->name, m->replacement);
2661 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2662 The latter is now a no-op, retained for compatibility only. If -dd is used,
2663 debugging subprocesses of the daemon is disabled. */
2666 if (Ustrcmp(argrest, "ropcr") == 0)
2668 /* drop_cr = TRUE; */
2671 /* Use an intermediate variable so that we don't set debugging while
2672 decoding the debugging bits. */
2676 unsigned int selector = D_default;
2679 if (*argrest == 'd')
2681 f.debug_daemon = TRUE;
2685 decode_bits(&selector, 1, debug_notall, argrest,
2686 debug_options, debug_options_count, US"debug", 0);
2687 debug_selector = selector;
2692 /* -E: This is a local error message. This option is not intended for
2693 external use at all, but is not restricted to trusted callers because it
2694 does no harm (just suppresses certain error messages) and if Exim is run
2695 not setuid root it won't always be trusted when it generates error
2696 messages using this option. If there is a message id following -E, point
2697 message_reference at it, for logging. */
2700 f.local_error_message = TRUE;
2701 if (mac_ismsgid(argrest)) message_reference = argrest;
2705 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2706 option, so it looks as if historically the -oex options are also callable
2707 without the leading -o. So we have to accept them. Before the switch,
2708 anything starting -oe has been converted to -e. Exim does not support all
2709 of the sendmail error options. */
2712 if (Ustrcmp(argrest, "e") == 0)
2714 arg_error_handling = ERRORS_SENDER;
2715 errors_sender_rc = EXIT_SUCCESS;
2717 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2718 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2719 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2720 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2725 /* -F: Set sender's full name, used instead of the gecos entry from
2726 the password file. Since users can usually alter their gecos entries,
2727 there's no security involved in using this instead. The data can follow
2728 the -F or be in the next argument. */
2732 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2733 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2734 f.sender_name_forced = TRUE;
2738 /* -f: Set sender's address - this value is only actually used if Exim is
2739 run by a trusted user, or if untrusted_set_sender is set and matches the
2740 address, except that the null address can always be set by any user. The
2741 test for this happens later, when the value given here is ignored when not
2742 permitted. For an untrusted user, the actual sender is still put in Sender:
2743 if it doesn't match the From: header (unless no_local_from_check is set).
2744 The data can follow the -f or be in the next argument. The -r switch is an
2745 obsolete form of -f but since there appear to be programs out there that
2746 use anything that sendmail has ever supported, better accept it - the
2747 synonymizing is done before the switch above.
2749 At this stage, we must allow domain literal addresses, because we don't
2750 know what the setting of allow_domain_literals is yet. Ditto for trailing
2751 dots and strip_trailing_dot. */
2755 int dummy_start, dummy_end;
2758 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2759 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2761 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2764 uschar * temp = argrest + Ustrlen(argrest) - 1;
2765 while (temp >= argrest && isspace(*temp)) temp--;
2766 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2767 allow_domain_literals = TRUE;
2768 strip_trailing_dot = TRUE;
2770 allow_utf8_domains = TRUE;
2772 if (!(sender_address = parse_extract_address(argrest, &errmess,
2773 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2774 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2776 sender_address = string_copy_taint(sender_address, TRUE);
2778 message_smtputf8 = string_is_utf8(sender_address);
2779 allow_utf8_domains = FALSE;
2781 allow_domain_literals = FALSE;
2782 strip_trailing_dot = FALSE;
2784 f.sender_address_forced = TRUE;
2788 /* -G: sendmail invocation to specify that it's a gateway submission and
2789 sendmail may complain about problems instead of fixing them.
2790 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2791 not at this time complain about problems. */
2797 /* -h: Set the hop count for an incoming message. Exim does not currently
2798 support this; it always computes it by counting the Received: headers.
2799 To put it in will require a change to the spool header file format. */
2803 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2804 if (!isdigit(*argrest)) badarg = TRUE;
2808 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2809 not to be documented for sendmail but mailx (at least) uses it) */
2812 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2816 /* -L: set the identifier used for syslog; equivalent to setting
2817 syslog_processname in the config file, but needs to be an admin option. */
2821 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2822 if ((sz = Ustrlen(argrest)) > 32)
2823 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2825 exim_fail("exim: the -L syslog name is too short\n");
2826 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2830 receiving_message = FALSE;
2832 /* -MC: continue delivery of another message via an existing open
2833 file descriptor. This option is used for an internal call by the
2834 smtp transport when there is a pending message waiting to go to an
2835 address to which it has got a connection. Five subsequent arguments are
2836 required: transport name, host name, IP address, sequence number, and
2837 message_id. Transports may decline to create new processes if the sequence
2838 number gets too big. The channel is stdin. This (-MC) must be the last
2839 argument. There's a subsequent check that the real-uid is privileged.
2841 If we are running in the test harness. delay for a bit, to let the process
2842 that set this one up complete. This makes for repeatability of the logging,
2845 if (Ustrcmp(argrest, "C") == 0)
2847 union sockaddr_46 interface_sock;
2848 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2851 exim_fail("exim: too many or too few arguments after -MC\n");
2853 if (msg_action_arg >= 0)
2854 exim_fail("exim: incompatible arguments\n");
2856 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2857 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2858 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2859 continue_sequence = Uatoi(argv[++i]);
2860 msg_action = MSG_DELIVER;
2861 msg_action_arg = ++i;
2862 forced_delivery = TRUE;
2863 queue_run_pid = passed_qr_pid;
2864 queue_run_pipe = passed_qr_pipe;
2866 if (!mac_ismsgid(argv[i]))
2867 exim_fail("exim: malformed message id %s after -MC option\n",
2870 /* Set up $sending_ip_address and $sending_port, unless proxied */
2872 if (!continue_proxy_cipher)
2873 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2875 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2878 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2881 testharness_pause_ms(500);
2885 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2889 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2890 precedes -MC (see above). The flag indicates that the host to which
2891 Exim is connected has accepted an AUTH sequence. */
2893 case 'A': f.smtp_authenticated = TRUE; break;
2895 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2896 that exim is connected to supports the esmtp extension DSN */
2898 case 'D': smtp_peer_options |= OPTION_DSN; break;
2900 /* -MCd: for debug, set a process-purpose string */
2902 case 'd': if (++i < argc)
2903 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2907 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2908 from the commandline should be tainted - but we will need an untainted
2909 value for the spoolfile when doing a -odi delivery process. */
2911 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2915 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2917 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2919 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2920 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2921 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2923 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2925 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2930 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2931 it preceded -MC (see above) */
2933 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2935 #ifdef SUPPORT_SOCKS
2936 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2937 case 'p': proxy_session = TRUE;
2940 proxy_local_address = string_copy_taint(argv[i], TRUE);
2943 proxy_local_port = Uatoi(argv[i]);
2946 proxy_external_address = string_copy_taint(argv[i], TRUE);
2949 proxy_external_port = Uatoi(argv[i]);
2955 /* -MCQ: pass on the pid of the queue-running process that started
2956 this chain of deliveries and the fd of its synchronizing pipe; this
2957 is useful only when it precedes -MC (see above) */
2959 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2961 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2965 /* -MCq: do a quota check on the given recipient for the given size
2966 of message. Separate from -MC. */
2967 case 'q': rcpt_verify_quota = TRUE;
2968 if (++i < argc) message_size = Uatoi(argv[i]);
2972 /* -MCS: set the smtp_use_size flag; this is useful only when it
2973 precedes -MC (see above) */
2975 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2978 /* -MCs: used with -MCt; SNI was sent */
2979 /* -MCr: ditto, DANE */
2982 case 's': if (++i < argc)
2984 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
2985 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
2990 /* -MCt: similar to -MCT below but the connection is still open
2991 via a proxy process which handles the TLS context and coding.
2992 Require three arguments for the proxied local address and port,
2993 and the TLS cipher. */
2995 case 't': if (++i < argc)
2996 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
2999 sending_port = (int)(Uatol(argv[i]));
3002 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
3006 /* -MCT: set the tls_offered flag; this is useful only when it
3007 precedes -MC (see above). The flag indicates that the host to which
3008 Exim is connected has offered TLS support. */
3010 case 'T': smtp_peer_options |= OPTION_TLS; break;
3013 default: badarg = TRUE; break;
3018 /* -M[x]: various operations on the following list of message ids:
3019 -M deliver the messages, ignoring next retry times and thawing
3020 -Mc deliver the messages, checking next retry times, no thawing
3021 -Mf freeze the messages
3022 -Mg give up on the messages
3023 -Mt thaw the messages
3024 -Mrm remove the messages
3025 In the above cases, this must be the last option. There are also the
3026 following options which are followed by a single message id, and which
3027 act on that message. Some of them use the "recipient" addresses as well.
3028 -Mar add recipient(s)
3029 -MG move to a different queue
3030 -Mmad mark all recipients delivered
3031 -Mmd mark recipients(s) delivered
3033 -Mset load a message for use with -be
3035 -Mvc show copy (of whole message, in RFC 2822 format)
3042 msg_action = MSG_DELIVER;
3043 forced_delivery = f.deliver_force_thaw = TRUE;
3045 else if (Ustrcmp(argrest, "ar") == 0)
3047 msg_action = MSG_ADD_RECIPIENT;
3048 one_msg_action = TRUE;
3050 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3051 else if (Ustrcmp(argrest, "es") == 0)
3053 msg_action = MSG_EDIT_SENDER;
3054 one_msg_action = TRUE;
3056 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3057 else if (Ustrcmp(argrest, "g") == 0)
3059 msg_action = MSG_DELIVER;
3060 deliver_give_up = TRUE;
3062 else if (Ustrcmp(argrest, "G") == 0)
3064 msg_action = MSG_SETQUEUE;
3065 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
3067 else if (Ustrcmp(argrest, "mad") == 0)
3069 msg_action = MSG_MARK_ALL_DELIVERED;
3071 else if (Ustrcmp(argrest, "md") == 0)
3073 msg_action = MSG_MARK_DELIVERED;
3074 one_msg_action = TRUE;
3076 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3077 else if (Ustrcmp(argrest, "set") == 0)
3079 msg_action = MSG_LOAD;
3080 one_msg_action = TRUE;
3082 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3083 else if (Ustrcmp(argrest, "vb") == 0)
3085 msg_action = MSG_SHOW_BODY;
3086 one_msg_action = TRUE;
3088 else if (Ustrcmp(argrest, "vc") == 0)
3090 msg_action = MSG_SHOW_COPY;
3091 one_msg_action = TRUE;
3093 else if (Ustrcmp(argrest, "vh") == 0)
3095 msg_action = MSG_SHOW_HEADER;
3096 one_msg_action = TRUE;
3098 else if (Ustrcmp(argrest, "vl") == 0)
3100 msg_action = MSG_SHOW_LOG;
3101 one_msg_action = TRUE;
3103 else { badarg = TRUE; break; }
3105 /* All the -Mxx options require at least one message id. */
3107 msg_action_arg = i + 1;
3108 if (msg_action_arg >= argc)
3109 exim_fail("exim: no message ids given after %s option\n", arg);
3111 /* Some require only message ids to follow */
3113 if (!one_msg_action)
3115 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3116 exim_fail("exim: malformed message id %s after %s option\n",
3118 goto END_ARG; /* Remaining args are ids */
3121 /* Others require only one message id, possibly followed by addresses,
3122 which will be handled as normal arguments. */
3126 if (!mac_ismsgid(argv[msg_action_arg]))
3127 exim_fail("exim: malformed message id %s after %s option\n",
3128 argv[msg_action_arg], arg);
3134 /* Some programs seem to call the -om option without the leading o;
3135 for sendmail it askes for "me too". Exim always does this. */
3138 if (*argrest) badarg = TRUE;
3142 /* -N: don't do delivery - a debugging option that stops transports doing
3143 their thing. It implies debugging at the D_v level. */
3148 f.dont_deliver = TRUE;
3149 debug_selector |= D_v;
3150 debug_file = stderr;
3156 /* -n: This means "don't alias" in sendmail, apparently.
3157 For normal invocations, it has no effect.
3158 It may affect some other options. */
3164 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3165 option to the specified value. This form uses long names. We need to handle
3166 -O option=value and -Ooption=value. */
3171 exim_fail("exim: string expected after -O\n");
3177 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3180 if (!*(alias_arg = argrest))
3181 if (i+1 < argc) alias_arg = argv[++i];
3182 else exim_fail("exim: string expected after -oA\n");
3185 /* -oB: Set a connection message max value for remote deliveries */
3188 uschar * p = argrest;
3190 if (i+1 < argc && isdigit((argv[i+1][0])))
3194 connection_max_messages = 1;
3201 exim_fail("exim: number expected after -oB\n");
3202 connection_max_messages = Uatoi(p);
3207 /* -odb: background delivery */
3210 if (Ustrcmp(argrest, "b") == 0)
3212 f.synchronous_delivery = FALSE;
3213 arg_queue_only = FALSE;
3214 queue_only_set = TRUE;
3217 /* -odd: testsuite-only: add no inter-process delays */
3219 else if (Ustrcmp(argrest, "d") == 0)
3220 f.testsuite_delays = FALSE;
3222 /* -odf: foreground delivery (smail-compatible option); same effect as
3223 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3226 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3228 f.synchronous_delivery = TRUE;
3229 arg_queue_only = FALSE;
3230 queue_only_set = TRUE;
3233 /* -odq: queue only */
3235 else if (Ustrcmp(argrest, "q") == 0)
3237 f.synchronous_delivery = FALSE;
3238 arg_queue_only = TRUE;
3239 queue_only_set = TRUE;
3242 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3243 but no remote delivery */
3245 else if (Ustrcmp(argrest, "qs") == 0)
3247 f.queue_smtp = TRUE;
3248 arg_queue_only = FALSE;
3249 queue_only_set = TRUE;
3254 /* -oex: Sendmail error flags. As these are also accepted without the
3255 leading -o prefix, for compatibility with vacation and other callers,
3256 they are handled with -e above. */
3258 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3259 -oitrue: Another sendmail syntax for the same */
3262 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3267 /* -oM*: Set various characteristics for an incoming message; actually
3268 acted on for trusted callers only. */
3273 exim_fail("exim: data expected after -oM%s\n", argrest);
3275 /* -oMa: Set sender host address */
3277 if (Ustrcmp(argrest, "a") == 0)
3278 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3280 /* -oMaa: Set authenticator name */
3282 else if (Ustrcmp(argrest, "aa") == 0)
3283 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3285 /* -oMas: setting authenticated sender */
3287 else if (Ustrcmp(argrest, "as") == 0)
3288 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3290 /* -oMai: setting authenticated id */
3292 else if (Ustrcmp(argrest, "ai") == 0)
3293 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3295 /* -oMi: Set incoming interface address */
3297 else if (Ustrcmp(argrest, "i") == 0)
3298 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3300 /* -oMm: Message reference */
3302 else if (Ustrcmp(argrest, "m") == 0)
3304 if (!mac_ismsgid(argv[i+1]))
3305 exim_fail("-oMm must be a valid message ID\n");
3306 if (!f.trusted_config)
3307 exim_fail("-oMm must be called by a trusted user/config\n");
3308 message_reference = argv[++i];
3311 /* -oMr: Received protocol */
3313 else if (Ustrcmp(argrest, "r") == 0)
3315 if (received_protocol)
3316 exim_fail("received_protocol is set already\n");
3318 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3320 /* -oMs: Set sender host name */
3322 else if (Ustrcmp(argrest, "s") == 0)
3323 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3325 /* -oMt: Set sender ident */
3327 else if (Ustrcmp(argrest, "t") == 0)
3329 sender_ident_set = TRUE;
3330 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3333 /* Else a bad argument */
3340 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3341 seem to call this as -m (undocumented), so that is also accepted (see
3343 /* -oo: An ancient flag for old-style addresses which still seems to
3344 crop up in some calls (see in SCO). */
3348 if (*argrest) badarg = TRUE;
3351 /* -oP <name>: set pid file path for daemon
3352 -oPX: delete pid file of daemon */
3355 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3356 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3357 "(uid=%d euid=%d | %d)\n",
3358 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3359 if (!*argrest) override_pid_file_path = argv[++i];
3360 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3365 /* -or <n>: set timeout for non-SMTP acceptance
3366 -os <n>: set timeout for SMTP acceptance */
3371 int * tp = argrest[-1] == 'r'
3372 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3374 *tp = readconf_readtime(argrest, 0, FALSE);
3375 else if (i+1 < argc)
3376 *tp = readconf_readtime(argv[++i], 0, FALSE);
3379 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3383 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3384 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3387 if (*argrest) badarg = TRUE;
3388 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3391 /* -oY: Override creation of daemon notifier socket */
3394 if (*argrest) badarg = TRUE;
3395 else notifier_socket = NULL;
3398 /* Unknown -o argument */
3406 /* -ps: force Perl startup; -pd force delayed Perl startup */
3410 if (*argrest == 's' && argrest[1] == 0)
3412 perl_start_option = 1;
3415 if (*argrest == 'd' && argrest[1] == 0)
3417 perl_start_option = -1;
3422 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3423 which sets the host protocol and host name */
3426 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3430 uschar * hn = Ustrchr(argrest, ':');
3432 if (received_protocol)
3433 exim_fail("received_protocol is set already\n");
3436 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3439 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3440 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3441 sender_host_name = string_copy_taint(hn + 1, TRUE);
3448 receiving_message = FALSE;
3449 if (queue_interval >= 0)
3450 exim_fail("exim: -q specified more than once\n");
3452 /* -qq...: Do queue runs in a 2-stage manner */
3454 if (*argrest == 'q')
3456 f.queue_2stage = TRUE;
3460 /* -qi...: Do only first (initial) deliveries */
3462 if (*argrest == 'i')
3464 f.queue_run_first_delivery = TRUE;
3468 /* -qf...: Run the queue, forcing deliveries
3469 -qff..: Ditto, forcing thawing as well */
3471 if (*argrest == 'f')
3473 f.queue_run_force = TRUE;
3474 if (*++argrest == 'f')
3476 f.deliver_force_thaw = TRUE;
3481 /* -q[f][f]l...: Run the queue only on local deliveries */
3483 if (*argrest == 'l')
3485 f.queue_run_local = TRUE;
3489 /* -q[f][f][l][G<name>]... Work on the named queue */
3491 if (*argrest == 'G')
3494 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3495 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3496 queue_name = string_copyn(argrest, i);
3498 if (*argrest == '/') argrest++;
3501 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3502 only, optionally named, optionally starting from a given message id. */
3504 if (!(list_queue || count_queue))
3506 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3509 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3510 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3511 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3512 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3515 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3516 forced, optionally local only, optionally named. */
3518 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3520 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3524 case 'R': /* Synonymous with -qR... */
3526 const uschar *tainted_selectstr;
3528 receiving_message = FALSE;
3530 /* -Rf: As -R (below) but force all deliveries,
3531 -Rff: Ditto, but also thaw all frozen messages,
3532 -Rr: String is regex
3533 -Rrf: Regex and force
3534 -Rrff: Regex and force and thaw
3536 in all cases provided there are no further characters in this
3540 for (int i = 0; i < nelem(rsopts); i++)
3541 if (Ustrcmp(argrest, rsopts[i]) == 0)
3543 if (i != 2) f.queue_run_force = TRUE;
3544 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3545 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3546 argrest += Ustrlen(rsopts[i]);
3549 /* -R: Set string to match in addresses for forced queue run to
3550 pick out particular messages. */
3552 /* Avoid attacks from people providing very long strings, and do so before
3555 tainted_selectstr = argrest;
3556 else if (i+1 < argc)
3557 tainted_selectstr = argv[++i];
3559 exim_fail("exim: string expected after -R\n");
3560 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3564 /* -r: an obsolete synonym for -f (see above) */
3567 /* -S: Like -R but works on sender. */
3569 case 'S': /* Synonymous with -qS... */
3571 const uschar *tainted_selectstr;
3573 receiving_message = FALSE;
3575 /* -Sf: As -S (below) but force all deliveries,
3576 -Sff: Ditto, but also thaw all frozen messages,
3577 -Sr: String is regex
3578 -Srf: Regex and force
3579 -Srff: Regex and force and thaw
3581 in all cases provided there are no further characters in this
3585 for (int i = 0; i < nelem(rsopts); i++)
3586 if (Ustrcmp(argrest, rsopts[i]) == 0)
3588 if (i != 2) f.queue_run_force = TRUE;
3589 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3590 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3591 argrest += Ustrlen(rsopts[i]);
3594 /* -S: Set string to match in addresses for forced queue run to
3595 pick out particular messages. */
3598 tainted_selectstr = argrest;
3599 else if (i+1 < argc)
3600 tainted_selectstr = argv[++i];
3602 exim_fail("exim: string expected after -S\n");
3603 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3607 /* -Tqt is an option that is exclusively for use by the testing suite.
3608 It is not recognized in other circumstances. It allows for the setting up
3609 of explicit "queue times" so that various warning/retry things can be
3610 tested. Otherwise variability of clock ticks etc. cause problems. */
3613 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3614 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3619 /* -t: Set flag to extract recipients from body of message. */
3622 if (!*argrest) extract_recipients = TRUE;
3624 /* -ti: Set flag to extract recipients from body of message, and also
3625 specify that dot does not end the message. */
3627 else if (Ustrcmp(argrest, "i") == 0)
3629 extract_recipients = TRUE;
3633 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3636 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3643 /* -U: This means "initial user submission" in sendmail, apparently. The
3644 doc claims that in future sendmail may refuse syntactically invalid
3645 messages instead of fixing them. For the moment, we just ignore it. */
3651 /* -v: verify things - this is a very low-level debugging */
3656 debug_selector |= D_v;
3657 debug_file = stderr;
3663 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3665 The -x flag tells the sendmail command that mail from a local
3666 mail program has National Language Support (NLS) extended characters
3667 in the body of the mail item. The sendmail command can send mail with
3668 extended NLS characters across networks that normally corrupts these
3671 As Exim is 8-bit clean, it just ignores this flag. */
3674 if (*argrest) badarg = TRUE;
3677 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3678 logs to that file. We swallow the parameter and otherwise ignore it. */
3683 exim_fail("exim: string expected after -X\n");
3686 /* -z: a line of text to log */
3691 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3693 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3696 /* All other initial characters are errors */
3701 } /* End of high-level switch statement */
3703 /* Failed to recognize the option, or syntax error */
3706 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3707 "option %s\n", arg);
3711 /* If -R or -S have been specified without -q, assume a single queue run. */
3713 if ( (deliver_selectstring || deliver_selectstring_sender)
3714 && queue_interval < 0)
3719 store_pool = old_pool;
3722 /* If usage_wanted is set we call the usage function - which never returns */
3723 if (usage_wanted) exim_usage(called_as);
3725 /* Arguments have been processed. Check for incompatibilities. */
3726 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3727 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3728 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3729 || filter_test != FTEST_NONE
3730 || msg_action_arg > 0 && !one_msg_action
3732 || ( msg_action_arg > 0
3733 && ( f.daemon_listen || queue_interval > 0 || list_options
3734 || checking && msg_action != MSG_LOAD
3735 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3737 || ( (f.daemon_listen || queue_interval > 0)
3738 && ( sender_address || list_options || list_queue || checking
3741 || f.daemon_listen && queue_interval == 0
3742 || f.inetd_wait_mode && queue_interval >= 0
3744 && ( checking || smtp_input || extract_recipients
3745 || filter_test != FTEST_NONE || bi_option
3747 || ( verify_address_mode
3748 && ( f.address_test_mode || smtp_input || extract_recipients
3749 || filter_test != FTEST_NONE || bi_option
3751 || ( f.address_test_mode
3752 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3756 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3758 || deliver_selectstring && queue_interval < 0
3759 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3761 exim_fail("exim: incompatible command-line options or arguments\n");
3763 /* If debugging is set up, set the file and the file descriptor to pass on to
3764 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3765 to run in the foreground. */
3767 if (debug_selector != 0)
3769 debug_file = stderr;
3770 debug_fd = fileno(debug_file);
3771 f.background_daemon = FALSE;
3772 testharness_pause_ms(100); /* lets caller finish */
3773 if (debug_selector != D_v) /* -v only doesn't show this */
3775 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3776 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3778 if (!version_printed)
3779 show_whats_supported(FALSE);
3783 /* When started with root privilege, ensure that the limits on the number of
3784 open files and the number of processes (where that is accessible) are
3785 sufficiently large, or are unset, in case Exim has been called from an
3786 environment where the limits are screwed down. Not all OS have the ability to
3787 change some of these limits. */
3791 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3797 #ifdef RLIMIT_NOFILE
3798 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3800 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3802 rlp.rlim_cur = rlp.rlim_max = 0;
3805 /* I originally chose 1000 as a nice big number that was unlikely to
3806 be exceeded. It turns out that some older OS have a fixed upper limit of
3809 if (rlp.rlim_cur < 1000)
3811 rlp.rlim_cur = rlp.rlim_max = 1000;
3812 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3814 rlp.rlim_cur = rlp.rlim_max = 256;
3815 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3816 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3823 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3825 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3827 rlp.rlim_cur = rlp.rlim_max = 0;
3830 # ifdef RLIM_INFINITY
3831 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3833 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3835 if (rlp.rlim_cur < 1000)
3837 rlp.rlim_cur = rlp.rlim_max = 1000;
3839 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3840 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3846 /* Exim is normally entered as root (but some special configurations are
3847 possible that don't do this). However, it always spins off sub-processes that
3848 set their uid and gid as required for local delivery. We don't want to pass on
3849 any extra groups that root may belong to, so we want to get rid of them all at
3852 We need to obey setgroups() at this stage, before possibly giving up root
3853 privilege for a changed configuration file, but later on we might need to
3854 check on the additional groups for the admin user privilege - can't do that
3855 till after reading the config, which might specify the exim gid. Therefore,
3856 save the group list here first. */
3858 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3859 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3861 /* There is a fundamental difference in some BSD systems in the matter of
3862 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3863 known not to be different. On the "different" systems there is a single group
3864 list, and the first entry in it is the current group. On all other versions of
3865 Unix there is a supplementary group list, which is in *addition* to the current
3866 group. Consequently, to get rid of all extraneous groups on a "standard" system
3867 you pass over 0 groups to setgroups(), while on a "different" system you pass
3868 over a single group - the current group, which is always the first group in the
3869 list. Calling setgroups() with zero groups on a "different" system results in
3870 an error return. The following code should cope with both types of system.
3872 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3873 the "setgroups() with zero groups" - and changes the egid.
3874 Thanks to that we had to stash the original_egid above, for use below
3875 in the call to exim_setugid().
3877 However, if this process isn't running as root, setgroups() can't be used
3878 since you have to be root to run it, even if throwing away groups.
3879 Except, sigh, for Hurd - where you can.
3880 Not being root here happens only in some unusual configurations. */
3883 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3884 && setgroups(0, NULL) != 0
3886 && setgroups(1, group_list) != 0)
3887 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3889 /* If the configuration file name has been altered by an argument on the
3890 command line (either a new file name or a macro definition) and the caller is
3891 not root, or if this is a filter testing run, remove any setuid privilege the
3892 program has and run as the underlying user.
3894 The exim user is locked out of this, which severely restricts the use of -C
3897 Otherwise, set the real ids to the effective values (should be root unless run
3898 from inetd, which it can either be root or the exim uid, if one is configured).
3900 There is a private mechanism for bypassing some of this, in order to make it
3901 possible to test lots of configurations automatically, without having either to
3902 recompile each time, or to patch in an actual configuration file name and other
3903 values (such as the path name). If running in the test harness, pretend that
3904 configuration file changes and macro definitions haven't happened. */
3907 (!f.trusted_config || /* Config changed, or */
3908 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3909 real_uid != root_uid && /* Not root, and */
3910 !f.running_in_test_harness /* Not fudged */
3912 expansion_test /* expansion testing */
3914 filter_test != FTEST_NONE) /* Filter testing */
3916 setgroups(group_count, group_list);
3917 exim_setugid(real_uid, real_gid, FALSE,
3918 US"-C, -D, -be or -bf forces real uid");
3919 removed_privilege = TRUE;
3921 /* In the normal case when Exim is called like this, stderr is available
3922 and should be used for any logging information because attempts to write
3923 to the log will usually fail. To arrange this, we unset really_exim. However,
3924 if no stderr is available there is no point - we might as well have a go
3925 at the log (if it fails, syslog will be written).
3927 Note that if the invoker is Exim, the logs remain available. Messing with
3928 this causes unlogged successful deliveries. */
3930 if (log_stderr && real_uid != exim_uid)
3931 f.really_exim = FALSE;
3934 /* Privilege is to be retained for the moment. It may be dropped later,
3935 depending on the job that this Exim process has been asked to do. For now, set
3936 the real uid to the effective so that subsequent re-execs of Exim are done by a
3940 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3942 /* If testing a filter, open the file(s) now, before wasting time doing other
3943 setups and reading the message. */
3945 if (filter_test & FTEST_SYSTEM)
3946 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3947 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3950 if (filter_test & FTEST_USER)
3951 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3952 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3955 /* Initialise lookup_list
3956 If debugging, already called above via version reporting.
3957 In either case, we initialise the list of available lookups while running
3958 as root. All dynamically modules are loaded from a directory which is
3959 hard-coded into the binary and is code which, if not a module, would be
3960 part of Exim already. Ability to modify the content of the directory
3961 is equivalent to the ability to modify a setuid binary!
3963 This needs to happen before we read the main configuration. */
3966 /*XXX this excrescence could move to the testsuite standard config setup file */
3968 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3971 /* Read the main runtime configuration data; this gives up if there
3972 is a failure. It leaves the configuration file open so that the subsequent
3973 configuration data for delivery can be read if needed.
3975 NOTE: immediately after opening the configuration file we change the working
3976 directory to "/"! Later we change to $spool_directory. We do it there, because
3977 during readconf_main() some expansion takes place already. */
3979 /* Store the initial cwd before we change directories. Can be NULL if the
3980 dir has already been unlinked. */
3981 initial_cwd = os_getcwd(NULL, 0);
3982 if (!initial_cwd && errno)
3983 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
3985 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
3986 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
3989 -be[m] expansion test -
3990 -b[fF] filter test new
3992 -bmalware malware_test_file new
3994 -brw rewrite test new
3996 -bv[s] address verify -
3998 -bP <option> (except -bP config, which sets list_config)
4000 If any of these options is set, we suppress warnings about configuration
4001 issues (currently about tls_advertise_hosts and keep_environment not being
4005 int old_pool = store_pool;
4006 #ifdef MEASURE_TIMING
4007 struct timeval t0, diff;
4008 (void)gettimeofday(&t0, NULL);
4011 store_pool = POOL_CONFIG;
4012 readconf_main(checking || list_options);
4013 store_pool = old_pool;
4015 #ifdef MEASURE_TIMING
4016 report_time_since(&t0, US"readconf_main (delta)");
4020 /* Now in directory "/" */
4022 if (cleanup_environment() == FALSE)
4023 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4026 /* If an action on specific messages is requested, or if a daemon or queue
4027 runner is being started, we need to know if Exim was called by an admin user.
4028 This is the case if the real user is root or exim, or if the real group is
4029 exim, or if one of the supplementary groups is exim or a group listed in
4030 admin_groups. We don't fail all message actions immediately if not admin_user,
4031 since some actions can be performed by non-admin users. Instead, set admin_user
4032 for later interrogation. */
4034 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4035 f.admin_user = TRUE;
4037 for (int i = 0; i < group_count && !f.admin_user; i++)
4038 if (group_list[i] == exim_gid)
4039 f.admin_user = TRUE;
4040 else if (admin_groups)
4041 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4042 if (admin_groups[j] == group_list[i])
4043 f.admin_user = TRUE;
4045 /* Another group of privileged users are the trusted users. These are root,
4046 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4047 are permitted to specify sender_addresses with -f on the command line, and
4048 other message parameters as well. */
4050 if (real_uid == root_uid || real_uid == exim_uid)
4051 f.trusted_caller = TRUE;
4055 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4056 if (trusted_users[i] == real_uid)
4057 f.trusted_caller = TRUE;
4060 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4061 if (trusted_groups[i] == real_gid)
4062 f.trusted_caller = TRUE;
4063 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4064 if (trusted_groups[i] == group_list[j])
4065 f.trusted_caller = TRUE;
4068 /* At this point, we know if the user is privileged and some command-line
4069 options become possibly impermissible, depending upon the configuration file. */
4071 if (checking && commandline_checks_require_admin && !f.admin_user)
4072 exim_fail("exim: those command-line flags are set to require admin\n");
4074 /* Handle the decoding of logging options. */
4076 decode_bits(log_selector, log_selector_size, log_notall,
4077 log_selector_string, log_options, log_options_count, US"log", 0);
4081 debug_printf("configuration file is %s\n", config_main_filename);
4082 debug_printf("log selectors =");
4083 for (int i = 0; i < log_selector_size; i++)
4084 debug_printf(" %08x", log_selector[i]);
4088 /* If domain literals are not allowed, check the sender address that was
4089 supplied with -f. Ditto for a stripped trailing dot. */
4093 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4094 exim_fail("exim: bad -f address \"%s\": domain literals not "
4095 "allowed\n", sender_address);
4096 if (f_end_dot && !strip_trailing_dot)
4097 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4098 "(trailing dot not allowed)\n", sender_address);
4101 /* See if an admin user overrode our logging. */
4103 if (cmdline_syslog_name)
4106 syslog_processname = cmdline_syslog_name;
4107 log_file_path = string_copy(CUS"syslog");
4110 /* not a panic, non-privileged users should not be able to spam paniclog */
4112 "exim: you lack sufficient privilege to specify syslog process name\n");
4114 /* Paranoia check of maximum lengths of certain strings. There is a check
4115 on the length of the log file path in log.c, which will come into effect
4116 if there are any calls to write the log earlier than this. However, if we
4117 get this far but the string is very long, it is better to stop now than to
4118 carry on and (e.g.) receive a message and then have to collapse. The call to
4119 log_write() from here will cause the ultimate panic collapse if the complete
4120 file name exceeds the buffer length. */
4122 if (Ustrlen(log_file_path) > 200)
4123 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4124 "log_file_path is longer than 200 chars: aborting");
4126 if (Ustrlen(pid_file_path) > 200)
4127 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4128 "pid_file_path is longer than 200 chars: aborting");
4130 if (Ustrlen(spool_directory) > 200)
4131 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4132 "spool_directory is longer than 200 chars: aborting");
4134 /* Length check on the process name given to syslog for its TAG field,
4135 which is only permitted to be 32 characters or less. See RFC 3164. */
4137 if (Ustrlen(syslog_processname) > 32)
4138 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4139 "syslog_processname is longer than 32 chars: aborting");
4144 log_write(0, LOG_MAIN, "%s", log_oneline);
4145 return EXIT_SUCCESS;
4148 return EXIT_FAILURE;
4150 /* In some operating systems, the environment variable TMPDIR controls where
4151 temporary files are created; Exim doesn't use these (apart from when delivering
4152 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4153 If TMPDIR is found in the environment, reset it to the value defined in the
4154 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4155 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4156 EXIM_TMPDIR by the build scripts.
4160 if (environ) for (uschar ** p = USS environ; *p; p++)
4161 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4163 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4164 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4166 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4170 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4171 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4172 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4173 called by a user who has set the TZ variable. This then affects the timestamps
4174 in log files and in Received: headers, and any created Date: header lines. The
4175 required timezone is settable in the configuration file, so nothing can be done
4176 about this earlier - but hopefully nothing will normally be logged earlier than
4177 this. We have to make a new environment if TZ is wrong, but don't bother if
4178 timestamps_utc is set, because then all times are in UTC anyway. */
4180 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4181 f.timestamps_utc = TRUE;
4184 uschar *envtz = US getenv("TZ");
4186 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4187 : timezone_string != NULL
4190 uschar **p = USS environ;
4194 if (environ) while (*p++) count++;
4195 if (!envtz) count++;
4196 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4197 if (environ) for (p = USS environ; *p; p++)
4198 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4199 if (timezone_string)
4201 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4202 sprintf(CS *newp++, "TZ=%s", timezone_string);
4207 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4208 tod_stamp(tod_log));
4212 /* Handle the case when we have removed the setuid privilege because of -C or
4213 -D. This means that the caller of Exim was not root.
4215 There is a problem if we were running as the Exim user. The sysadmin may
4216 expect this case to retain privilege because "the binary was called by the
4217 Exim user", but it hasn't, because either the -D option set macros, or the
4218 -C option set a non-trusted configuration file. There are two possibilities:
4220 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4221 to do message deliveries. Thus, the fact that it is running as a
4222 non-privileged user is plausible, and might be wanted in some special
4223 configurations. However, really_exim will have been set false when
4224 privilege was dropped, to stop Exim trying to write to its normal log
4225 files. Therefore, re-enable normal log processing, assuming the sysadmin
4226 has set up the log directory correctly.
4228 (2) If deliver_drop_privilege is not set, the configuration won't work as
4229 apparently intended, and so we log a panic message. In order to retain
4230 root for -C or -D, the caller must either be root or be invoking a
4231 trusted configuration file (when deliver_drop_privilege is false). */
4233 if ( removed_privilege
4234 && (!f.trusted_config || opt_D_used)
4235 && real_uid == exim_uid)
4236 if (deliver_drop_privilege)
4237 f.really_exim = TRUE; /* let logging work normally */
4239 log_write(0, LOG_MAIN|LOG_PANIC,
4240 "exim user lost privilege for using %s option",
4241 f.trusted_config? "-D" : "-C");
4243 /* Start up Perl interpreter if Perl support is configured and there is a
4244 perl_startup option, and the configuration or the command line specifies
4245 initializing starting. Note that the global variables are actually called
4246 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4249 if (perl_start_option != 0)
4250 opt_perl_at_start = (perl_start_option > 0);
4251 if (opt_perl_at_start && opt_perl_startup != NULL)
4254 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4255 if ((errstr = init_perl(opt_perl_startup)))
4256 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4257 opt_perl_started = TRUE;
4259 #endif /* EXIM_PERL */
4261 /* Log the arguments of the call if the configuration file said so. This is
4262 a debugging feature for finding out what arguments certain MUAs actually use.
4263 Don't attempt it if logging is disabled, or if listing variables or if
4264 verifying/testing addresses or expansions. */
4266 if ( (debug_selector & D_any || LOGGING(arguments))
4267 && f.really_exim && !list_options && !checking)
4269 uschar *p = big_buffer;
4270 Ustrcpy(p, US"cwd= (failed)");
4277 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4278 p += Ustrlen(CCS p);
4281 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4283 for (int i = 0; i < argc; i++)
4285 int len = Ustrlen(argv[i]);
4286 const uschar *printing;
4288 if (p + len + 8 >= big_buffer + big_buffer_size)
4290 Ustrcpy(p, US" ...");
4291 log_write(0, LOG_MAIN, "%s", big_buffer);
4292 Ustrcpy(big_buffer, US"...");
4295 printing = string_printing(argv[i]);
4296 if (!*printing) quote = US"\"";
4299 const uschar *pp = printing;
4301 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4303 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4304 (p - big_buffer) - 4), printing, quote);
4307 if (LOGGING(arguments))
4308 log_write(0, LOG_MAIN, "%s", big_buffer);
4310 debug_printf("%s\n", big_buffer);
4313 /* Set the working directory to be the top-level spool directory. We don't rely
4314 on this in the code, which always uses fully qualified names, but it's useful
4315 for core dumps etc. Don't complain if it fails - the spool directory might not
4316 be generally accessible and calls with the -C option (and others) have lost
4317 privilege by now. Before the chdir, we try to ensure that the directory exists.
4320 if (Uchdir(spool_directory) != 0)
4322 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4323 (void) Uchdir(spool_directory);
4326 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4327 alias file. Exim doesn't have such a concept, but this call is screwed into
4328 Sun's YP makefiles. Handle this by calling a configured script, as the real
4329 user who called Exim. The -oA option can be used to pass an argument to the
4334 (void) fclose(config_file);
4335 if (bi_command && *bi_command)
4339 argv[i++] = bi_command;
4340 if (alias_arg) argv[i++] = alias_arg;
4343 setgroups(group_count, group_list);
4344 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4346 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4347 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4349 execv(CS argv[0], (char *const *)argv);
4350 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4354 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4359 /* We moved the admin/trusted check to be immediately after reading the
4360 configuration file. We leave these prints here to ensure that syslog setup,
4361 logfile setup, and so on has already happened. */
4363 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4364 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4366 /* Only an admin user may start the daemon or force a queue run in the default
4367 configuration, but the queue run restriction can be relaxed. Only an admin
4368 user may request that a message be returned to its sender forthwith. Only an
4369 admin user may specify a debug level greater than D_v (because it might show
4370 passwords, etc. in lookup queries). Only an admin user may request a queue
4371 count. Only an admin user can use the test interface to scan for email
4372 (because Exim will be in the spool dir and able to look at mails). */
4376 BOOL debugset = (debug_selector & ~D_v) != 0;
4377 if ( deliver_give_up || f.daemon_listen || malware_test_file
4378 || count_queue && queue_list_requires_admin
4379 || list_queue && queue_list_requires_admin
4380 || queue_interval >= 0 && prod_requires_admin
4381 || queue_name_dest && prod_requires_admin
4382 || debugset && !f.running_in_test_harness
4384 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4387 /* If the real user is not root or the exim uid, the argument for passing
4388 in an open TCP/IP connection for another message is not permitted, nor is
4389 running with the -N option for any delivery action, unless this call to exim is
4390 one that supplied an input message, or we are using a patched exim for
4391 regression testing. */
4393 if ( real_uid != root_uid && real_uid != exim_uid
4394 && ( continue_hostname
4396 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4398 && !f.running_in_test_harness
4400 exim_fail("exim: Permission denied\n");
4402 /* If the caller is not trusted, certain arguments are ignored when running for
4403 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4404 Note that authority for performing certain actions on messages is tested in the
4405 queue_action() function. */
4407 if (!f.trusted_caller && !checking)
4409 sender_host_name = sender_host_address = interface_address =
4410 sender_ident = received_protocol = NULL;
4411 sender_host_port = interface_port = 0;
4412 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4415 /* If a sender host address is set, extract the optional port number off the
4416 end of it and check its syntax. Do the same thing for the interface address.
4417 Exim exits if the syntax is bad. */
4421 if (sender_host_address)
4422 sender_host_port = check_port(sender_host_address);
4423 if (interface_address)
4424 interface_port = check_port(interface_address);
4427 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4430 if (f.trusted_caller)
4432 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4433 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4436 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4439 /* If an SMTP message is being received check to see if the standard input is a
4440 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4441 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4446 union sockaddr_46 inetd_sock;
4447 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4448 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4450 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4451 if (family == AF_INET || family == AF_INET6)
4453 union sockaddr_46 interface_sock;
4454 size = sizeof(interface_sock);
4456 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4457 interface_address = host_ntoa(-1, &interface_sock, NULL,
4460 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4462 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4465 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4466 NULL, &sender_host_port);
4467 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4468 "inetd is not supported when mua_wrapper is set");
4472 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4477 /* If the load average is going to be needed while receiving a message, get it
4478 now for those OS that require the first call to os_getloadavg() to be done as
4479 root. There will be further calls later for each message received. */
4481 #ifdef LOAD_AVG_NEEDS_ROOT
4482 if ( receiving_message
4483 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4484 load_average = OS_GETLOADAVG();
4487 /* The queue_only configuration option can be overridden by -odx on the command
4488 line, except that if queue_only_override is false, queue_only cannot be unset
4489 from the command line. */
4491 if (queue_only_set && (queue_only_override || arg_queue_only))
4492 queue_only = arg_queue_only;
4494 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4497 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4498 if (arg_smtp_receive_timeout >= 0)
4499 smtp_receive_timeout = arg_smtp_receive_timeout;
4501 /* If Exim was started with root privilege, unless we have already removed the
4502 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4503 except when starting the daemon or doing some kind of delivery or address
4504 testing (-bt). These are the only cases when root need to be retained. We run
4505 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4506 retained only for starting the daemon. We always do the initgroups() in this
4507 situation (controlled by the TRUE below), in order to be as close as possible
4508 to the state Exim usually runs in. */
4510 if ( !unprivileged /* originally had root AND */
4511 && !removed_privilege /* still got root AND */
4512 && !f.daemon_listen /* not starting the daemon */
4513 && queue_interval <= 0 /* (either kind of daemon) */
4514 && ( /* AND EITHER */
4515 deliver_drop_privilege /* requested unprivileged */
4517 queue_interval < 0 /* not running the queue */
4518 && ( msg_action_arg < 0 /* and */
4519 || msg_action != MSG_DELIVER /* not delivering */
4521 && (!checking || !f.address_test_mode) /* not address checking */
4522 && !rcpt_verify_quota /* and not quota checking */
4524 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4526 /* When we are retaining a privileged uid, we still change to the exim gid. */
4531 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4532 rv = setgid(exim_gid);
4533 /* Impact of failure is that some stuff might end up with an incorrect group.
4534 We track this for failures from root, since any attempt to change privilege
4535 by root should succeed and failures should be examined. For non-root,
4536 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4537 no need to complain then. */
4539 if (!(unprivileged || removed_privilege))
4540 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4543 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4544 (long int)exim_gid, strerror(errno));
4548 /* Handle a request to scan a file for malware */
4549 if (malware_test_file)
4551 #ifdef WITH_CONTENT_SCAN
4553 set_process_info("scanning file for malware");
4554 if ((result = malware_in_file(malware_test_file)) == FAIL)
4556 printf("No malware found.\n");
4561 printf("Malware lookup returned non-okay/fail: %d\n", result);
4565 printf("Malware found: %s\n", malware_name);
4567 printf("Malware scan detected malware of unknown name.\n");
4569 printf("Malware scanning not enabled at compile time.\n");
4574 /* Handle a request to list the delivery queue */
4578 set_process_info("listing the queue");
4579 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4583 /* Handle a request to count the delivery queue */
4587 set_process_info("counting the queue");
4588 fprintf(stdout, "%u\n", queue_count());
4592 /* Handle actions on specific messages, except for the force delivery and
4593 message load actions, which are done below. Some actions take a whole list of
4594 message ids, which are known to continue up to the end of the arguments. Others
4595 take a single message id and then operate on the recipients list. */
4597 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4599 int yield = EXIT_SUCCESS;
4600 set_process_info("acting on specified messages");
4602 /* ACL definitions may be needed when removing a message (-Mrm) because
4603 event_action gets expanded */
4605 if (msg_action == MSG_REMOVE)
4607 int old_pool = store_pool;
4608 store_pool = POOL_CONFIG;
4610 store_pool = old_pool;
4611 store_writeprotect(POOL_CONFIG);
4614 if (!one_msg_action)
4616 for (i = msg_action_arg; i < argc; i++)
4617 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4618 yield = EXIT_FAILURE;
4621 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4622 default: printf("\n"); break;
4626 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4627 recipients_arg)) yield = EXIT_FAILURE;
4631 /* We used to set up here to skip reading the ACL section, on
4632 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4633 Now, since the intro of the ${acl } expansion, ACL definitions may be
4634 needed in transports so we lost the optimisation. */
4637 int old_pool = store_pool;
4638 #ifdef MEASURE_TIMING
4639 struct timeval t0, diff;
4640 (void)gettimeofday(&t0, NULL);
4643 store_pool = POOL_CONFIG;
4645 store_pool = old_pool;
4647 /* -be can add macro definitions, needing to link to the macro structure
4648 chain. Otherwise, make the memory used for config data readonly. */
4650 if (!expansion_test)
4651 store_writeprotect(POOL_CONFIG);
4653 #ifdef MEASURE_TIMING
4654 report_time_since(&t0, US"readconf_rest (delta)");
4658 /* Handle a request to check quota */
4659 if (rcpt_verify_quota)
4660 if (real_uid != root_uid && real_uid != exim_uid)
4661 exim_fail("exim: Permission denied\n");
4662 else if (recipients_arg >= argc)
4663 exim_fail("exim: missing recipient for quota check\n");
4666 verify_quota(argv[recipients_arg]);
4667 exim_exit(EXIT_SUCCESS);
4670 /* Handle the -brt option. This is for checking out retry configurations.
4671 The next three arguments are a domain name or a complete address, and
4672 optionally two error numbers. All it does is to call the function that
4673 scans the retry configuration data. */
4675 if (test_retry_arg >= 0)
4677 retry_config *yield;
4678 int basic_errno = 0;
4680 const uschar *s1, *s2;
4682 if (test_retry_arg >= argc)
4684 printf("-brt needs a domain or address argument\n");
4685 exim_exit(EXIT_FAILURE);
4687 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4690 /* If the first argument contains no @ and no . it might be a local user
4691 or it might be a single-component name. Treat as a domain. */
4693 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4695 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4696 "being \ntreated as a one-component domain, not as a local part.\n\n",
4700 /* There may be an optional second domain arg. */
4702 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4703 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4705 /* The final arg is an error name */
4707 if (test_retry_arg < argc)
4709 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4711 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4714 printf("%s\n", CS error);
4715 return EXIT_FAILURE;
4718 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4719 code > 100 as an error is for matching codes to the decade. Turn them into
4720 a real error code, off the decade. */
4722 if (basic_errno == ERRNO_MAIL4XX ||
4723 basic_errno == ERRNO_RCPT4XX ||
4724 basic_errno == ERRNO_DATA4XX)
4726 int code = (more_errno >> 8) & 255;
4728 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4729 else if (code > 100)
4730 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4734 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4735 printf("No retry information found\n");
4738 more_errno = yield->more_errno;
4739 printf("Retry rule: %s ", yield->pattern);
4741 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4743 printf("quota%s%s ",
4744 (more_errno > 0)? "_" : "",
4745 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4747 else if (yield->basic_errno == ECONNREFUSED)
4749 printf("refused%s%s ",
4750 (more_errno > 0)? "_" : "",
4751 (more_errno == 'M')? "MX" :
4752 (more_errno == 'A')? "A" : "");
4754 else if (yield->basic_errno == ETIMEDOUT)
4757 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4759 if (more_errno != 0) printf("_%s",
4760 (more_errno == 'M')? "MX" : "A");
4763 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4764 printf("auth_failed ");
4767 for (retry_rule * r = yield->rules; r; r = r->next)
4769 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4770 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4776 printf(",%d.", x/1000);
4790 exim_exit(EXIT_SUCCESS);
4793 /* Handle a request to list one or more configuration options */
4794 /* If -n was set, we suppress some information */
4799 set_process_info("listing variables");
4800 if (recipients_arg >= argc)
4801 fail = !readconf_print(US"all", NULL, flag_n);
4802 else for (i = recipients_arg; i < argc; i++)
4805 (Ustrcmp(argv[i], "router") == 0 ||
4806 Ustrcmp(argv[i], "transport") == 0 ||
4807 Ustrcmp(argv[i], "authenticator") == 0 ||
4808 Ustrcmp(argv[i], "macro") == 0 ||
4809 Ustrcmp(argv[i], "environment") == 0))
4811 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4815 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4817 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4822 set_process_info("listing config");
4823 exim_exit(readconf_print(US"config", NULL, flag_n)
4824 ? EXIT_SUCCESS : EXIT_FAILURE);
4828 /* Initialise subsystems as required. */
4832 /* Handle a request to deliver one or more messages that are already on the
4833 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4834 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4836 Delivery of specific messages is typically used for a small number when
4837 prodding by hand (when the option forced_delivery will be set) or when
4838 re-execing to regain root privilege. Each message delivery must happen in a
4839 separate process, so we fork a process for each one, and run them sequentially
4840 so that debugging output doesn't get intertwined, and to avoid spawning too
4841 many processes if a long list is given. However, don't fork for the last one;
4842 this saves a process in the common case when Exim is called to deliver just one
4845 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4847 if (prod_requires_admin && !f.admin_user)
4849 fprintf(stderr, "exim: Permission denied\n");
4850 exim_exit(EXIT_FAILURE);
4852 set_process_info("delivering specified messages");
4853 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4854 for (i = msg_action_arg; i < argc; i++)
4858 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4859 that runs into a later copy into the untainted global message_id[] */
4860 /*XXX Do we need a length limit check here? */
4862 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4863 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4865 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4866 exim_underbar_exit(EXIT_SUCCESS);
4870 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4872 exim_exit(EXIT_FAILURE);
4876 exim_exit(EXIT_SUCCESS);
4880 /* If only a single queue run is requested, without SMTP listening, we can just
4881 turn into a queue runner, with an optional starting message id. */
4883 if (queue_interval == 0 && !f.daemon_listen)
4885 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4886 start_queue_run_id ? US" starting at " : US"",
4887 start_queue_run_id ? start_queue_run_id: US"",
4888 stop_queue_run_id ? US" stopping at " : US"",
4889 stop_queue_run_id ? stop_queue_run_id : US"");
4891 set_process_info("running the '%s' queue (single queue run)", queue_name);
4893 set_process_info("running the queue (single queue run)");
4894 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4895 exim_exit(EXIT_SUCCESS);
4899 /* Find the login name of the real user running this process. This is always
4900 needed when receiving a message, because it is written into the spool file. It
4901 may also be used to construct a from: or a sender: header, and in this case we
4902 need the user's full name as well, so save a copy of it, checked for RFC822
4903 syntax and munged if necessary, if it hasn't previously been set by the -F
4904 argument. We may try to get the passwd entry more than once, in case NIS or
4905 other delays are in evidence. Save the home directory for use in filter testing
4910 if ((pw = getpwuid(real_uid)) != NULL)
4912 originator_login = string_copy(US pw->pw_name);
4913 originator_home = string_copy(US pw->pw_dir);
4915 /* If user name has not been set by -F, set it from the passwd entry
4916 unless -f has been used to set the sender address by a trusted user. */
4918 if (!originator_name)
4920 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4922 uschar *name = US pw->pw_gecos;
4923 uschar *amp = Ustrchr(name, '&');
4926 /* Most Unix specify that a '&' character in the gecos field is
4927 replaced by a copy of the login name, and some even specify that
4928 the first character should be upper cased, so that's what we do. */
4933 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4934 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4935 buffer[loffset] = toupper(buffer[loffset]);
4939 /* If a pattern for matching the gecos field was supplied, apply
4940 it and then expand the name string. */
4942 if (gecos_pattern && gecos_name)
4944 const pcre2_code *re;
4945 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4947 if (regex_match_and_setup(re, name, 0, -1))
4949 uschar *new_name = expand_string(gecos_name);
4953 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4954 "gecos field \"%s\"\n", new_name, name);
4957 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4958 "\"%s\": %s\n", gecos_name, expand_string_message);
4960 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4961 "gecos field \"%s\"\n", gecos_pattern, name);
4962 store_free((void *)re);
4964 originator_name = string_copy(name);
4967 /* A trusted caller has used -f but not -F */
4969 else originator_name = US"";
4972 /* Break the retry loop */
4977 if (++i > finduser_retries) break;
4981 /* If we cannot get a user login, log the incident and give up, unless the
4982 configuration specifies something to use. When running in the test harness,
4983 any setting of unknown_login overrides the actual name. */
4985 if (!originator_login || f.running_in_test_harness)
4989 originator_login = expand_string(unknown_login);
4990 if (!originator_name && unknown_username)
4991 originator_name = expand_string(unknown_username);
4992 if (!originator_name) originator_name = US"";
4994 if (!originator_login)
4995 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4999 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5002 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5004 /* If a message is created by this call of Exim, the uid/gid of its originator
5005 are those of the caller. These values are overridden if an existing message is
5006 read in from the spool. */
5008 originator_uid = real_uid;
5009 originator_gid = real_gid;
5011 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5012 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5014 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5015 returns. We leave this till here so that the originator_ fields are available
5016 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5019 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5023 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5024 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5025 "mua_wrapper is set");
5028 # ifndef DISABLE_TLS
5029 /* This also checks that the library linkage is working and we can call
5030 routines in it, so call even if tls_require_ciphers is unset */
5032 # ifdef MEASURE_TIMING
5033 struct timeval t0, diff;
5034 (void)gettimeofday(&t0, NULL);
5036 if (!tls_dropprivs_validate_require_cipher(FALSE))
5038 # ifdef MEASURE_TIMING
5039 report_time_since(&t0, US"validate_ciphers (delta)");
5047 /* If the sender ident has not been set (by a trusted caller) set it to
5048 the caller. This will get overwritten below for an inetd call. If a trusted
5049 caller has set it empty, unset it. */
5051 if (!sender_ident) sender_ident = originator_login;
5052 else if (!*sender_ident) sender_ident = NULL;
5054 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5055 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5056 originator_* variables set. */
5058 if (test_rewrite_arg >= 0)
5060 f.really_exim = FALSE;
5061 if (test_rewrite_arg >= argc)
5063 printf("-brw needs an address argument\n");
5064 exim_exit(EXIT_FAILURE);
5066 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5067 exim_exit(EXIT_SUCCESS);
5070 /* A locally-supplied message is considered to be coming from a local user
5071 unless a trusted caller supplies a sender address with -f, or is passing in the
5072 message via SMTP (inetd invocation or otherwise). */
5074 if ( !sender_address && !smtp_input
5075 || !f.trusted_caller && filter_test == FTEST_NONE)
5077 f.sender_local = TRUE;
5079 /* A trusted caller can supply authenticated_sender and authenticated_id
5080 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5081 defaults except when host checking. */
5083 if (!authenticated_sender && !host_checking)
5084 authenticated_sender = string_sprintf("%s@%s", originator_login,
5085 qualify_domain_sender);
5086 if (!authenticated_id && !host_checking)
5087 authenticated_id = originator_login;
5090 /* Trusted callers are always permitted to specify the sender address.
5091 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5092 is specified is the empty address. However, if a trusted caller does not
5093 specify a sender address for SMTP input, we leave sender_address unset. This
5094 causes the MAIL commands to be honoured. */
5096 if ( !smtp_input && !sender_address
5097 || !receive_check_set_sender(sender_address))
5099 /* Either the caller is not permitted to set a general sender, or this is
5100 non-SMTP input and the trusted caller has not set a sender. If there is no
5101 sender, or if a sender other than <> is set, override with the originator's
5102 login (which will get qualified below), except when checking things. */
5104 if ( !sender_address /* No sender_address set */
5106 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5107 !checking)) /* Not running tests, including filter tests */
5109 sender_address = originator_login;
5110 f.sender_address_forced = FALSE;
5111 sender_address_domain = 0;
5115 /* Remember whether an untrusted caller set the sender address */
5117 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5119 /* Ensure that the sender address is fully qualified unless it is the empty
5120 address, which indicates an error message, or doesn't exist (root caller, smtp
5121 interface, no -f argument). */
5123 if (sender_address && *sender_address && sender_address_domain == 0)
5124 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5125 qualify_domain_sender);
5127 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5129 /* Handle a request to verify a list of addresses, or test them for delivery.
5130 This must follow the setting of the sender address, since routers can be
5131 predicated upon the sender. If no arguments are given, read addresses from
5132 stdin. Set debug_level to at least D_v to get full output for address testing.
5135 if (verify_address_mode || f.address_test_mode)
5138 int flags = vopt_qualify;
5140 if (verify_address_mode)
5142 if (!verify_as_sender) flags |= vopt_is_recipient;
5143 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5148 flags |= vopt_is_recipient;
5149 debug_selector |= D_v;
5150 debug_file = stderr;
5151 debug_fd = fileno(debug_file);
5152 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5155 if (recipients_arg < argc)
5156 while (recipients_arg < argc)
5158 /* Supplied addresses are tainted since they come from a user */
5159 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5162 BOOL finished = FALSE;
5163 uschar *ss = parse_find_address_end(s, FALSE);
5164 if (*ss == ',') *ss = 0; else finished = TRUE;
5165 test_address(s, flags, &exit_value);
5168 while (*++s == ',' || isspace(*s)) ;
5174 uschar * s = get_stdinput(NULL, NULL);
5176 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5180 exim_exit(exit_value);
5183 /* Handle expansion checking. Either expand items on the command line, or read
5184 from stdin if there aren't any. If -Mset was specified, load the message so
5185 that its variables can be used, but restrict this facility to admin users.
5186 Otherwise, if -bem was used, read a message from stdin. */
5190 dns_init(FALSE, FALSE, FALSE);
5191 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5195 exim_fail("exim: permission denied\n");
5196 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5197 /* Checking the length of the ID is sufficient to validate it.
5198 Get an untainted version so file opens can be done. */
5199 message_id = string_copy_taint(message_id, FALSE);
5201 spoolname = string_sprintf("%s-H", message_id);
5202 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5203 printf ("Failed to load message datafile %s\n", message_id);
5204 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5205 printf ("Failed to load message %s\n", message_id);
5208 /* Read a test message from a file. We fudge it up to be on stdin, saving
5209 stdin itself for later reading of expansion strings. */
5211 else if (expansion_test_message)
5213 int save_stdin = dup(0);
5214 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5216 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5219 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5220 message_ended = END_NOTENDED;
5221 read_message_body(receive_msg(extract_recipients));
5222 message_linecount += body_linecount;
5223 (void)dup2(save_stdin, 0);
5224 (void)close(save_stdin);
5225 clearerr(stdin); /* Required by Darwin */
5228 /* Only admin users may see config-file macros this way */
5230 if (!f.admin_user) macros_user = macros = mlast = NULL;
5232 /* Allow $recipients for this testing */
5234 f.enable_dollar_recipients = TRUE;
5236 /* Expand command line items */
5238 if (recipients_arg < argc)
5239 while (recipients_arg < argc)
5240 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5246 char *(*fn_readline)(const char *) = NULL;
5247 void (*fn_addhist)(const char *) = NULL;
5251 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5254 while (s = get_stdinput(fn_readline, fn_addhist))
5255 expansion_test_line(s);
5258 if (dlhandle) dlclose(dlhandle);
5262 /* The data file will be open after -Mset */
5264 if (deliver_datafile >= 0)
5266 (void)close(deliver_datafile);
5267 deliver_datafile = -1;
5270 exim_exit(EXIT_SUCCESS);
5274 /* The active host name is normally the primary host name, but it can be varied
5275 for hosts that want to play several parts at once. We need to ensure that it is
5276 set for host checking, and for receiving messages. */
5278 smtp_active_hostname = primary_hostname;
5279 if (raw_active_hostname != NULL)
5281 uschar *nah = expand_string(raw_active_hostname);
5284 if (!f.expand_string_forcedfail)
5285 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5286 "(smtp_active_hostname): %s", raw_active_hostname,
5287 expand_string_message);
5289 else if (nah[0] != 0) smtp_active_hostname = nah;
5292 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5293 given IP address so that the blocking and relay configuration can be tested.
5294 Unless a sender_ident was set by -oMt, we discard it (the default is the
5295 caller's login name). An RFC 1413 call is made only if we are running in the
5296 test harness and an incoming interface and both ports are specified, because
5297 there is no TCP/IP call to find the ident for. */
5304 if (!sender_ident_set)
5306 sender_ident = NULL;
5307 if (f.running_in_test_harness && sender_host_port
5308 && interface_address && interface_port)
5309 verify_get_ident(1223); /* note hardwired port number */
5312 /* In case the given address is a non-canonical IPv6 address, canonicalize
5313 it. The code works for both IPv4 and IPv6, as it happens. */
5315 size = host_aton(sender_host_address, x);
5316 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5317 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5319 /* Now set up for testing */
5321 host_build_sender_fullhost();
5325 f.sender_local = FALSE;
5326 f.sender_host_notsocket = TRUE;
5327 debug_file = stderr;
5328 debug_fd = fileno(debug_file);
5329 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5330 "**** but without any ident (RFC 1413) callback.\n"
5331 "**** This is not for real!\n\n",
5332 sender_host_address);
5334 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5335 if (verify_check_host(&hosts_connection_nolog) == OK)
5336 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5337 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5339 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5340 because a log line has already been written for all its failure exists
5341 (usually "connection refused: <reason>") and writing another one is
5342 unnecessary clutter. */
5344 if (smtp_start_session())
5347 for (; (reset_point = store_mark()); store_reset(reset_point))
5349 if (smtp_setup_msg() <= 0) break;
5350 if (!receive_msg(FALSE)) break;
5352 return_path = sender_address = NULL;
5353 dnslist_domain = dnslist_matched = NULL;
5354 #ifndef DISABLE_DKIM
5355 dkim_cur_signer = NULL;
5358 deliver_localpart_orig = NULL;
5359 deliver_domain_orig = NULL;
5360 callout_address = sending_ip_address = NULL;
5361 deliver_localpart_data = deliver_domain_data =
5362 recipient_data = sender_data = NULL;
5363 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5367 exim_exit(EXIT_SUCCESS);
5371 /* Arrange for message reception if recipients or SMTP were specified;
5372 otherwise complain unless a version print (-bV) happened or this is a filter
5373 verification test or info dump.
5374 In the former case, show the configuration file name. */
5376 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5378 if (version_printed)
5380 if (Ustrchr(config_main_filelist, ':'))
5381 printf("Configuration file search path is %s\n", config_main_filelist);
5382 printf("Configuration file is %s\n", config_main_filename);
5383 return EXIT_SUCCESS;
5386 if (info_flag != CMDINFO_NONE)
5388 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5389 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5392 if (filter_test == FTEST_NONE)
5393 exim_usage(called_as);
5397 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5398 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5399 that we are not called from inetd, because that is rejected above. The
5400 following configuration settings are forced here:
5402 (1) Synchronous delivery (-odi)
5403 (2) Errors to stderr (-oep == -oeq)
5404 (3) No parallel remote delivery
5405 (4) Unprivileged delivery
5407 We don't force overall queueing options because there are several of them;
5408 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5409 to override any SMTP queueing. */
5413 f.synchronous_delivery = TRUE;
5414 arg_error_handling = ERRORS_STDERR;
5415 remote_max_parallel = 1;
5416 deliver_drop_privilege = TRUE;
5417 f.queue_smtp = FALSE;
5418 queue_smtp_domains = NULL;
5420 message_utf8_downconvert = -1; /* convert-if-needed */
5425 /* Prepare to accept one or more new messages on the standard input. When a
5426 message has been read, its id is returned in message_id[]. If doing immediate
5427 delivery, we fork a delivery process for each received message, except for the
5428 last one, where we can save a process switch.
5430 It is only in non-smtp mode that error_handling is allowed to be changed from
5431 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5432 sendmail error modes other than -oem ever actually used? Later: yes.) */
5434 if (!smtp_input) error_handling = arg_error_handling;
5436 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5437 logging being sent down the socket and make an identd call to get the
5440 else if (f.is_inetd)
5442 (void)fclose(stderr);
5443 exim_nullstd(); /* Re-open to /dev/null */
5444 verify_get_ident(IDENT_PORT);
5445 host_build_sender_fullhost();
5446 set_process_info("handling incoming connection from %s via inetd",
5450 /* If the sender host address has been set, build sender_fullhost if it hasn't
5451 already been done (which it will have been for inetd). This caters for the
5452 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5453 so that the test for IP options is skipped for -bs input. */
5455 if (sender_host_address && !sender_fullhost)
5457 host_build_sender_fullhost();
5458 set_process_info("handling incoming connection from %s via -oMa",
5460 f.sender_host_notsocket = TRUE;
5463 /* Otherwise, set the sender host as unknown except for inetd calls. This
5464 prevents host checking in the case of -bs not from inetd and also for -bS. */
5466 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5468 /* If stdout does not exist, then dup stdin to stdout. This can happen
5469 if exim is started from inetd. In this case fd 0 will be set to the socket,
5470 but fd 1 will not be set. This also happens for passed SMTP channels. */
5472 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5474 /* Set up the incoming protocol name and the state of the program. Root is
5475 allowed to force received protocol via the -oMr option above. If we have come
5476 via inetd, the process info has already been set up. We don't set
5477 received_protocol here for smtp input, as it varies according to
5478 batch/HELO/EHLO/AUTH/TLS. */
5482 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5483 smtp_batched_input? "batched " : "",
5484 sender_address ? sender_address : originator_login);
5488 int old_pool = store_pool;
5489 store_pool = POOL_PERM;
5490 if (!received_protocol)
5491 received_protocol = string_sprintf("local%s", called_as);
5492 store_pool = old_pool;
5493 set_process_info("accepting a local non-SMTP message from <%s>",
5497 /* Initialize the session_local_queue-only flag (this will be ignored if
5498 mua_wrapper is set) */
5501 session_local_queue_only = queue_only;
5503 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5504 the spool if so configured. On failure, we must not attempt to send an error
5505 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5506 error code is given.) */
5508 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5509 exim_fail("exim: insufficient disk space\n");
5511 /* If this is smtp input of any kind, real or batched, handle the start of the
5514 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5515 because a log line has already been written for all its failure exists
5516 (usually "connection refused: <reason>") and writing another one is
5517 unnecessary clutter. */
5523 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5524 if (verify_check_host(&hosts_connection_nolog) == OK)
5525 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5526 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5527 if (!smtp_start_session())
5530 exim_exit(EXIT_SUCCESS);
5534 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5535 (we handle buferring so as to have visibility of fill level). */
5539 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5540 if (expand_string_message)
5541 if (thismessage_size_limit == -1)
5542 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5543 "message_size_limit: %s", expand_string_message);
5545 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5546 "message_size_limit: %s", expand_string_message);
5548 setvbuf(stdin, NULL, _IONBF, 0);
5551 /* Loop for several messages when reading SMTP input. If we fork any child
5552 processes, we don't want to wait for them unless synchronous delivery is
5553 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5554 same as SIG_DFL, despite the fact that documentation often lists the default as
5555 "ignore". This is a confusing area. This is what I know:
5557 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5558 processes that complete simply to go away without ever becoming defunct. You
5559 can't then wait for them - but we don't want to wait for them in the
5560 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5561 happen for all OS (e.g. *BSD is different).
5563 But that's not the end of the story. Some (many? all?) systems have the
5564 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5565 has by default, so it seems that the difference is merely one of default
5566 (compare restarting vs non-restarting signals).
5568 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5569 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5570 of the loop below. Paranoia rules.
5572 February 2003: That's *still* not the end of the story. There are now versions
5573 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5574 process then calls waitpid(), a grumble is written to the system log, because
5575 this is logically inconsistent. In other words, it doesn't like the paranoia.
5576 As a consequence of this, the waitpid() below is now excluded if we are sure
5577 that SIG_IGN works. */
5579 if (!f.synchronous_delivery)
5582 struct sigaction act;
5583 act.sa_handler = SIG_IGN;
5584 sigemptyset(&(act.sa_mask));
5585 act.sa_flags = SA_NOCLDWAIT;
5586 sigaction(SIGCHLD, &act, NULL);
5588 signal(SIGCHLD, SIG_IGN);
5592 /* Save the current store pool point, for resetting at the start of
5593 each message, and save the real sender address, if any. */
5595 real_sender_address = sender_address;
5597 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5598 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5601 for (BOOL more = TRUE; more; )
5603 rmark reset_point = store_mark();
5606 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5607 input and build the recipients list, before calling receive_msg() to read the
5608 message proper. Whatever sender address is given in the SMTP transaction is
5609 often ignored for local senders - we use the actual sender, which is normally
5610 either the underlying user running this process or a -f argument provided by
5611 a trusted caller. It is saved in real_sender_address. The test for whether to
5612 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5617 if ((rc = smtp_setup_msg()) > 0)
5619 if (real_sender_address != NULL &&
5620 !receive_check_set_sender(sender_address))
5622 sender_address = raw_sender = real_sender_address;
5623 sender_address_unrewritten = NULL;
5626 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5627 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5628 the very end. The result of the ACL is ignored (as for other non-SMTP
5629 messages). It is run for its potential side effects. */
5631 if (smtp_batched_input && acl_not_smtp_start != NULL)
5633 uschar *user_msg, *log_msg;
5634 f.enable_dollar_recipients = TRUE;
5635 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5636 &user_msg, &log_msg);
5637 f.enable_dollar_recipients = FALSE;
5640 /* Now get the data for the message */
5642 more = receive_msg(extract_recipients);
5645 cancel_cutthrough_connection(TRUE, US"receive dropped");
5646 if (more) goto MORELOOP;
5647 smtp_log_no_mail(); /* Log no mail if configured */
5648 exim_exit(EXIT_FAILURE);
5653 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5654 smtp_log_no_mail(); /* Log no mail if configured */
5655 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5659 /* In the non-SMTP case, we have all the information from the command
5660 line, but must process it in case it is in the more general RFC822
5661 format, and in any case, to detect syntax errors. Also, it appears that
5662 the use of comma-separated lists as single arguments is common, so we
5663 had better support them. */
5668 int count = argc - recipients_arg;
5669 uschar **list = argv + recipients_arg;
5671 /* These options cannot be changed dynamically for non-SMTP messages */
5673 f.active_local_sender_retain = local_sender_retain;
5674 f.active_local_from_check = local_from_check;
5676 /* Save before any rewriting */
5678 raw_sender = string_copy(sender_address);
5680 /* Loop for each argument (supplied by user hence tainted) */
5682 for (int i = 0; i < count; i++)
5684 int start, end, domain;
5686 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5687 * We'll still want to cap it to something, just in case. */
5688 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5690 /* Loop for each comma-separated address */
5694 BOOL finished = FALSE;
5696 uschar *ss = parse_find_address_end(s, FALSE);
5698 if (*ss == ',') *ss = 0; else finished = TRUE;
5700 /* Check max recipients - if -t was used, these aren't recipients */
5702 if (recipients_max > 0 && ++rcount > recipients_max &&
5703 !extract_recipients)
5704 if (error_handling == ERRORS_STDERR)
5706 fprintf(stderr, "exim: too many recipients\n");
5707 exim_exit(EXIT_FAILURE);
5711 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5712 errors_sender_rc : EXIT_FAILURE;
5716 BOOL b = allow_utf8_domains;
5717 allow_utf8_domains = TRUE;
5720 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5724 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5725 else allow_utf8_domains = b;
5730 if (domain == 0 && !f.allow_unqualified_recipient)
5733 errmess = US"unqualified recipient address not allowed";
5737 if (error_handling == ERRORS_STDERR)
5739 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5740 string_printing(list[i]), errmess);
5741 exim_exit(EXIT_FAILURE);
5747 eblock.text1 = string_printing(list[i]);
5748 eblock.text2 = errmess;
5750 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5751 errors_sender_rc : EXIT_FAILURE;
5754 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5757 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5761 /* Show the recipients when debugging */
5765 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5766 if (recipients_list)
5768 debug_printf("Recipients:\n");
5769 for (int i = 0; i < recipients_count; i++)
5770 debug_printf(" %s\n", recipients_list[i].address);
5774 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5775 ignored; rejecting here would just add complication, and it can just as
5776 well be done later. Allow $recipients to be visible in the ACL. */
5778 if (acl_not_smtp_start)
5780 uschar *user_msg, *log_msg;
5781 f.enable_dollar_recipients = TRUE;
5782 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5783 &user_msg, &log_msg);
5784 f.enable_dollar_recipients = FALSE;
5787 /* Pause for a while waiting for input. If none received in that time,
5788 close the logfile, if we had one open; then if we wait for a long-running
5789 datasource (months, in one use-case) log rotation will not leave us holding
5792 if (!receive_timeout)
5793 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5796 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5797 will just read the headers for the message, and not write anything onto the
5800 message_ended = END_NOTENDED;
5801 more = receive_msg(extract_recipients);
5803 /* more is always FALSE here (not SMTP message) when reading a message
5804 for real; when reading the headers of a message for filter testing,
5805 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5807 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5808 } /* Non-SMTP message reception */
5810 /* If this is a filter testing run, there are headers in store, but
5811 no message on the spool. Run the filtering code in testing mode, setting
5812 the domain to the qualify domain and the local part to the current user,
5813 unless they have been set by options. The prefix and suffix are left unset
5814 unless specified. The the return path is set to to the sender unless it has
5815 already been set from a return-path header in the message. */
5817 if (filter_test != FTEST_NONE)
5819 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5820 deliver_domain_orig = deliver_domain;
5821 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5822 deliver_localpart_orig = deliver_localpart;
5823 deliver_localpart_prefix = US ftest_prefix;
5824 deliver_localpart_suffix = US ftest_suffix;
5825 deliver_home = originator_home;
5829 printf("Return-path copied from sender\n");
5830 return_path = string_copy(sender_address);
5833 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5834 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5836 receive_add_recipient(
5837 string_sprintf("%s%s%s@%s",
5838 ftest_prefix ? ftest_prefix : US"",
5840 ftest_suffix ? ftest_suffix : US"",
5841 deliver_domain), -1);
5843 printf("Recipient = %s\n", recipients_list[0].address);
5844 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5845 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5847 if (chdir("/")) /* Get away from wherever the user is running this from */
5849 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5850 exim_exit(EXIT_FAILURE);
5853 /* Now we run either a system filter test, or a user filter test, or both.
5854 In the latter case, headers added by the system filter will persist and be
5855 available to the user filter. We need to copy the filter variables
5858 if (filter_test & FTEST_SYSTEM)
5859 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5860 exim_exit(EXIT_FAILURE);
5862 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5864 if (filter_test & FTEST_USER)
5865 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5866 exim_exit(EXIT_FAILURE);
5868 exim_exit(EXIT_SUCCESS);
5871 /* Else act on the result of message reception. We should not get here unless
5872 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5873 will be TRUE. If it is not, check on the number of messages received in this
5876 if ( !session_local_queue_only
5877 && smtp_accept_queue_per_connection > 0
5878 && receive_messagecount > smtp_accept_queue_per_connection)
5880 session_local_queue_only = TRUE;
5881 queue_only_reason = 2;
5884 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5885 and queue_only_load is set, check that the load average is below it. If it is
5886 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5887 default), we put the whole session into queue_only mode. It then remains this
5888 way for any subsequent messages on the same SMTP connection. This is a
5889 deliberate choice; even though the load average may fall, it doesn't seem
5890 right to deliver later messages on the same call when not delivering earlier
5891 ones. However, there are odd cases where this is not wanted, so this can be
5892 changed by setting queue_only_load_latch false. */
5894 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5895 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5897 queue_only_reason = 3;
5898 if (queue_only_load_latch) session_local_queue_only = TRUE;
5901 /* If running as an MUA wrapper, all queueing options and freezing options
5905 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5907 /* Log the queueing here, when it will get a message id attached, but
5908 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5911 if (local_queue_only)
5913 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5914 switch(queue_only_reason)
5917 log_write(L_delay_delivery,
5918 LOG_MAIN, "no immediate delivery: more than %d messages "
5919 "received in one connection", smtp_accept_queue_per_connection);
5923 log_write(L_delay_delivery,
5924 LOG_MAIN, "no immediate delivery: load average %.2f",
5925 (double)load_average/1000.0);
5930 else if (f.queue_only_policy || f.deliver_freeze)
5931 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5933 /* Else do the delivery unless the ACL or local_scan() called for queue only
5934 or froze the message. Always deliver in a separate process. A fork failure is
5935 not a disaster, as the delivery will eventually happen on a subsequent queue
5936 run. The search cache must be tidied before the fork, as the parent will
5937 do it before exiting. The child will trigger a lookup failure and
5938 thereby defer the delivery if it tries to use (for example) a cached ldap
5939 connection that the parent has called unbind on. */
5946 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5949 close_unwanted(); /* Close unwanted file descriptors and TLS */
5950 exim_nullstd(); /* Ensure std{in,out,err} exist */
5952 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5953 mode, deliver_drop_privilege is forced TRUE). */
5955 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5957 delivery_re_exec(CEE_EXEC_EXIT);
5958 /* Control does not return here. */
5961 /* No need to re-exec */
5963 rc = deliver_message(message_id, FALSE, FALSE);
5965 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5966 ? EXIT_SUCCESS : EXIT_FAILURE);
5971 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5972 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5973 "process: %s", strerror(errno));
5977 release_cutthrough_connection(US"msg passed for delivery");
5979 /* In the parent, wait if synchronous delivery is required. This will
5980 always be the case in MUA wrapper mode. */
5982 if (f.synchronous_delivery)
5985 while (wait(&status) != pid);
5986 if ((status & 0x00ff) != 0)
5987 log_write(0, LOG_MAIN|LOG_PANIC,
5988 "process %d crashed with signal %d while delivering %s",
5989 (int)pid, status & 0x00ff, message_id);
5990 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5995 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5996 automatically reaps children (see comments above the loop), clear away any
5997 finished subprocesses here, in case there are lots of messages coming in
5998 from the same source. */
6000 #ifndef SIG_IGN_WORKS
6001 while (waitpid(-1, NULL, WNOHANG) > 0);
6005 return_path = sender_address = NULL;
6006 authenticated_sender = NULL;
6007 deliver_localpart_orig = NULL;
6008 deliver_domain_orig = NULL;
6009 deliver_host = deliver_host_address = NULL;
6010 dnslist_domain = dnslist_matched = NULL;
6011 #ifdef WITH_CONTENT_SCAN
6012 malware_name = NULL;
6014 callout_address = NULL;
6015 sending_ip_address = NULL;
6016 deliver_localpart_data = deliver_domain_data =
6017 recipient_data = sender_data = NULL;
6019 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6021 store_reset(reset_point);
6024 exim_exit(EXIT_SUCCESS); /* Never returns */
6025 return 0; /* To stop compiler warning */