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);
961 if (is_stdout) fputs(CCS s, stdout);
962 else debug_printf("%s", s);
967 show_db_version(gstring * g)
969 #ifdef DB_VERSION_STRING
972 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
973 g = string_fmt_append(g, " Runtime: %s\n",
974 db_version(NULL, NULL, NULL));
977 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
979 #elif defined(BTREEVERSION) && defined(HASHVERSION)
981 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
983 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
986 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
987 g = string_cat(g, US"Probably ndbm\n");
988 #elif defined(USE_TDB)
989 g = string_cat(g, US"Using tdb\n");
992 g = string_cat(g, US"Probably GDBM (native mode)\n");
994 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1001 /* This function is called for -bV/--version and for -d to output the optional
1002 features of the current Exim binary.
1004 Arguments: BOOL, true for stdout else debug channel
1009 show_whats_supported(BOOL is_stdout)
1011 rmark reset_point = store_mark();
1014 DEBUG(D_any) {} else g = show_db_version(g);
1016 g = string_cat(g, US"Support for:");
1017 #ifdef SUPPORT_CRYPTEQ
1018 g = string_cat(g, US" crypteq");
1021 g = string_cat(g, US" iconv()");
1024 g = string_cat(g, US" IPv6");
1026 #ifdef HAVE_SETCLASSRESOURCES
1027 g = string_cat(g, US" use_setclassresources");
1030 g = string_cat(g, US" PAM");
1033 g = string_cat(g, US" Perl");
1035 #ifdef EXPAND_DLFUNC
1036 g = string_cat(g, US" Expand_dlfunc");
1038 #ifdef USE_TCP_WRAPPERS
1039 g = string_cat(g, US" TCPwrappers");
1042 g = string_cat(g, US" GnuTLS");
1045 g = string_cat(g, US" OpenSSL");
1047 #ifndef DISABLE_TLS_RESUME
1048 g = string_cat(g, US" TLS_resume");
1050 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1051 g = string_cat(g, US" translate_ip_address");
1053 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1054 g = string_cat(g, US" move_frozen_messages");
1056 #ifdef WITH_CONTENT_SCAN
1057 g = string_cat(g, US" Content_Scanning");
1060 g = string_cat(g, US" DANE");
1062 #ifndef DISABLE_DKIM
1063 g = string_cat(g, US" DKIM");
1065 #ifdef SUPPORT_DMARC
1066 g = string_cat(g, US" DMARC");
1068 #ifndef DISABLE_DNSSEC
1069 g = string_cat(g, US" DNSSEC");
1071 #ifndef DISABLE_EVENT
1072 g = string_cat(g, US" Event");
1075 g = string_cat(g, US" I18N");
1077 #ifndef DISABLE_OCSP
1078 g = string_cat(g, US" OCSP");
1080 #ifndef DISABLE_PIPE_CONNECT
1081 g = string_cat(g, US" PIPECONNECT");
1083 #ifndef DISABLE_PRDR
1084 g = string_cat(g, US" PRDR");
1086 #ifdef SUPPORT_PROXY
1087 g = string_cat(g, US" PROXY");
1089 #ifndef DISABLE_QUEUE_RAMP
1090 g = string_cat(g, US" Queue_Ramp");
1092 #ifdef SUPPORT_SOCKS
1093 g = string_cat(g, US" SOCKS");
1096 g = string_cat(g, US" SPF");
1098 #if defined(SUPPORT_SRS)
1099 g = string_cat(g, US" SRS");
1103 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1105 #ifdef EXPERIMENTAL_ARC
1106 g = string_cat(g, US" Experimental_ARC");
1108 #ifdef EXPERIMENTAL_BRIGHTMAIL
1109 g = string_cat(g, US" Experimental_Brightmail");
1111 #ifdef EXPERIMENTAL_DCC
1112 g = string_cat(g, US" Experimental_DCC");
1114 #ifdef EXPERIMENTAL_DSN_INFO
1115 g = string_cat(g, US" Experimental_DSN_info");
1117 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1118 g = string_cat(g, US" Experimental_ESMTP_Limits");
1120 #ifdef EXPERIMENTAL_QUEUEFILE
1121 g = string_cat(g, US" Experimental_QUEUEFILE");
1123 #if defined(EXPERIMENTAL_SRS_ALT)
1124 g = string_cat(g, US" Experimental_SRS");
1126 g = string_cat(g, US"\n");
1128 g = string_cat(g, US"Lookups (built-in):");
1129 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1130 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1132 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1133 g = string_cat(g, US" cdb");
1135 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1136 g = string_cat(g, US" dbm dbmjz dbmnz");
1138 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1139 g = string_cat(g, US" dnsdb");
1141 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1142 g = string_cat(g, US" dsearch");
1144 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1145 g = string_cat(g, US" ibase");
1147 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1148 g = string_cat(g, US" json");
1150 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1151 g = string_cat(g, US" ldap ldapdn ldapm");
1154 g = string_cat(g, US" lmdb");
1156 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1157 g = string_cat(g, US" mysql");
1159 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1160 g = string_cat(g, US" nis nis0");
1162 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1163 g = string_cat(g, US" nisplus");
1165 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1166 g = string_cat(g, US" oracle");
1168 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1169 g = string_cat(g, US" passwd");
1171 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1172 g = string_cat(g, US" pgsql");
1174 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1175 g = string_cat(g, US" redis");
1177 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1178 g = string_cat(g, US" sqlite");
1180 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1181 g = string_cat(g, US" testdb");
1183 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1184 g = string_cat(g, US" whoson");
1186 g = string_cat(g, US"\n");
1188 g = auth_show_supported(g);
1189 g = route_show_supported(g);
1190 g = transport_show_supported(g);
1192 #ifdef WITH_CONTENT_SCAN
1193 g = malware_show_supported(g);
1195 show_string(is_stdout, g); g = NULL;
1197 if (fixed_never_users[0] > 0)
1200 g = string_cat(g, US"Fixed never_users: ");
1201 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1202 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1203 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1206 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1208 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1210 /* Everything else is details which are only worth reporting when debugging.
1211 Perhaps the tls_version_report should move into this too. */
1215 /* clang defines __GNUC__ (at least, for me) so test for it first */
1216 #if defined(__clang__)
1217 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1218 #elif defined(__GNUC__)
1219 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1223 "? unknown version ?"
1227 g = string_cat(g, US"Compiler: <unknown>\n");
1230 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1231 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1232 __GLIBC__, __GLIBC_MINOR__);
1233 if (__GLIBC_PREREQ(2, 1))
1234 g = string_fmt_append(g, " Runtime: %s\n",
1235 gnu_get_libc_version());
1238 g = show_db_version(g);
1241 g = tls_version_report(g);
1244 g = utf8_version_report(g);
1246 #ifdef SUPPORT_DMARC
1247 g = dmarc_version_report(g);
1250 g = spf_lib_version_report(g);
1253 show_string(is_stdout, g);
1256 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1257 if (authi->version_report)
1258 g = (*authi->version_report)(g);
1260 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1261 characters; unless it's an ancient version of PCRE in which case it
1263 #ifndef PCRE_PRERELEASE
1264 # define PCRE_PRERELEASE
1267 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1270 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1271 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1273 PCRE2_MAJOR, PCRE2_MINOR,
1274 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1278 #undef EXPAND_AND_QUOTE
1280 show_string(is_stdout, g);
1284 for (int i = 0; i < lookup_list_count; i++)
1285 if (lookup_list[i]->version_report)
1286 g = lookup_list[i]->version_report(g);
1287 show_string(is_stdout, g);
1290 #ifdef WHITELIST_D_MACROS
1291 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1293 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1295 #ifdef TRUSTED_CONFIG_LIST
1296 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1298 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1302 show_string(is_stdout, g);
1303 store_reset(reset_point);
1307 /*************************************************
1308 * Show auxiliary information about Exim *
1309 *************************************************/
1312 show_exim_information(enum commandline_info request, FILE *stream)
1317 fprintf(stream, "Oops, something went wrong.\n");
1321 "The -bI: flag takes a string indicating which information to provide.\n"
1322 "If the string is not recognised, you'll get this help (on stderr).\n"
1324 " exim -bI:help this information\n"
1325 " exim -bI:dscp list of known dscp value keywords\n"
1326 " exim -bI:sieve list of supported sieve extensions\n"
1330 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1331 fprintf(stream, "%s\n", *pp);
1334 dscp_list_to_stream(stream);
1340 /*************************************************
1341 * Quote a local part *
1342 *************************************************/
1344 /* This function is used when a sender address or a From: or Sender: header
1345 line is being created from the caller's login, or from an authenticated_id. It
1346 applies appropriate quoting rules for a local part.
1348 Argument: the local part
1349 Returns: the local part, quoted if necessary
1353 local_part_quote(uschar *lpart)
1355 BOOL needs_quote = FALSE;
1358 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1360 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1361 (*t != '.' || t == lpart || t[1] == 0);
1364 if (!needs_quote) return lpart;
1366 g = string_catn(NULL, US"\"", 1);
1370 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1373 g = string_cat(g, lpart);
1376 g = string_catn(g, lpart, nq - lpart);
1377 g = string_catn(g, US"\\", 1);
1378 g = string_catn(g, nq, 1);
1382 g = string_catn(g, US"\"", 1);
1383 return string_from_gstring(g);
1389 /*************************************************
1390 * Load readline() functions *
1391 *************************************************/
1393 /* This function is called from testing executions that read data from stdin,
1394 but only when running as the calling user. Currently, only -be does this. The
1395 function loads the readline() function library and passes back the functions.
1396 On some systems, it needs the curses library, so load that too, but try without
1397 it if loading fails. All this functionality has to be requested at build time.
1400 fn_readline_ptr pointer to where to put the readline pointer
1401 fn_addhist_ptr pointer to where to put the addhistory function
1403 Returns: the dlopen handle or NULL on failure
1407 set_readline(char * (**fn_readline_ptr)(const char *),
1408 void (**fn_addhist_ptr)(const char *))
1411 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1413 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1414 if (dlhandle_curses) dlclose(dlhandle_curses);
1418 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1419 * char * readline (const char *prompt);
1420 * void add_history (const char *string);
1422 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1423 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1426 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1434 /*************************************************
1435 * Get a line from stdin for testing things *
1436 *************************************************/
1438 /* This function is called when running tests that can take a number of lines
1439 of input (for example, -be and -bt). It handles continuations and trailing
1440 spaces. And prompting and a blank line output on eof. If readline() is in use,
1441 the arguments are non-NULL and provide the relevant functions.
1444 fn_readline readline function or NULL
1445 fn_addhist addhist function or NULL
1447 Returns: pointer to dynamic memory, or NULL at end of file
1451 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1454 BOOL had_input = FALSE;
1456 if (!fn_readline) { printf("> "); fflush(stdout); }
1458 for (int i = 0;; i++)
1460 uschar buffer[1024];
1464 char *readline_line = NULL;
1467 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1468 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1469 p = US readline_line;
1474 /* readline() not in use */
1477 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1481 /* Handle the line */
1484 ss = p + Ustrlen(p);
1485 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1488 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1490 g = string_catn(g, p, ss - p);
1493 if (fn_readline) free(readline_line);
1496 /* g can only be NULL if ss==p */
1497 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1500 --g->ptr; /* drop the \ */
1503 if (had_input) return g ? string_from_gstring(g) : US"";
1510 /*************************************************
1511 * Output usage information for the program *
1512 *************************************************/
1514 /* This function is called when there are no recipients
1515 or a specific --help argument was added.
1518 progname information on what name we were called by
1520 Returns: DOES NOT RETURN
1524 exim_usage(uschar *progname)
1527 /* Handle specific program invocation variants */
1528 if (Ustrcmp(progname, US"-mailq") == 0)
1530 "mailq - list the contents of the mail queue\n\n"
1531 "For a list of options, see the Exim documentation.\n");
1533 /* Generic usage - we output this whatever happens */
1535 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1536 "not directly from a shell command line. Options and/or arguments control\n"
1537 "what it does when called. For a list of options, see the Exim documentation.\n");
1542 /*************************************************
1543 * Validate that the macros given are okay *
1544 *************************************************/
1546 /* Typically, Exim will drop privileges if macros are supplied. In some
1547 cases, we want to not do so.
1549 Arguments: opt_D_used - true if the commandline had a "-D" option
1550 Returns: true if trusted, false otherwise
1554 macros_trusted(BOOL opt_D_used)
1556 #ifdef WHITELIST_D_MACROS
1557 uschar *whitelisted, *end, *p, **whites;
1558 int white_count, i, n;
1560 BOOL prev_char_item, found;
1565 #ifndef WHITELIST_D_MACROS
1569 /* We only trust -D overrides for some invoking users:
1570 root, the exim run-time user, the optional config owner user.
1571 I don't know why config-owner would be needed, but since they can own the
1572 config files anyway, there's no security risk to letting them override -D. */
1573 if ( ! ((real_uid == root_uid)
1574 || (real_uid == exim_uid)
1575 #ifdef CONFIGURE_OWNER
1576 || (real_uid == config_uid)
1580 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1584 /* Get a list of macros which are whitelisted */
1585 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1586 prev_char_item = FALSE;
1588 for (p = whitelisted; *p != '\0'; ++p)
1590 if (*p == ':' || isspace(*p))
1595 prev_char_item = FALSE;
1598 if (!prev_char_item)
1599 prev_char_item = TRUE;
1606 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1607 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1612 if (i == white_count)
1614 while (*p != '\0' && p < end)
1620 /* The list of commandline macros should be very short.
1621 Accept the N*M complexity. */
1622 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1625 for (uschar ** w = whites; *w; ++w)
1626 if (Ustrcmp(*w, m->name) == 0)
1633 if (!m->replacement)
1635 if ((len = m->replen) == 0)
1637 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1640 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1646 /*************************************************
1647 * Expansion testing *
1648 *************************************************/
1650 /* Expand and print one item, doing macro-processing.
1653 item line for expansion
1657 expansion_test_line(const uschar * line)
1663 Ustrncpy(big_buffer, line, big_buffer_size);
1664 big_buffer[big_buffer_size-1] = '\0';
1665 len = Ustrlen(big_buffer);
1667 (void) macros_expand(0, &len, &dummy_macexp);
1669 if (isupper(big_buffer[0]))
1671 if (macro_read_assignment(big_buffer))
1672 printf("Defined macro '%s'\n", mlast->name);
1675 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1676 else printf("Failed: %s\n", expand_string_message);
1681 /*************************************************
1682 * Entry point and high-level code *
1683 *************************************************/
1685 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1686 the appropriate action. All the necessary functions are present in the one
1687 binary. I originally thought one should split it up, but it turns out that so
1688 much of the apparatus is needed in each chunk that one might as well just have
1689 it all available all the time, which then makes the coding easier as well.
1692 argc count of entries in argv
1693 argv argument strings, with argv[0] being the program name
1695 Returns: EXIT_SUCCESS if terminated successfully
1696 EXIT_FAILURE otherwise, except when a message has been sent
1697 to the sender, and -oee was given
1701 main(int argc, char **cargv)
1703 uschar **argv = USS cargv;
1704 int arg_receive_timeout = -1;
1705 int arg_smtp_receive_timeout = -1;
1706 int arg_error_handling = error_handling;
1707 int filter_sfd = -1;
1708 int filter_ufd = -1;
1711 int list_queue_option = 0;
1713 int msg_action_arg = -1;
1714 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1715 int queue_only_reason = 0;
1717 int perl_start_option = 0;
1719 int recipients_arg = argc;
1720 int sender_address_domain = 0;
1721 int test_retry_arg = -1;
1722 int test_rewrite_arg = -1;
1723 gid_t original_egid;
1724 BOOL arg_queue_only = FALSE;
1725 BOOL bi_option = FALSE;
1726 BOOL checking = FALSE;
1727 BOOL count_queue = FALSE;
1728 BOOL expansion_test = FALSE;
1729 BOOL extract_recipients = FALSE;
1730 BOOL flag_G = FALSE;
1731 BOOL flag_n = FALSE;
1732 BOOL forced_delivery = FALSE;
1733 BOOL f_end_dot = FALSE;
1734 BOOL deliver_give_up = FALSE;
1735 BOOL list_queue = FALSE;
1736 BOOL list_options = FALSE;
1737 BOOL list_config = FALSE;
1738 BOOL local_queue_only;
1739 BOOL one_msg_action = FALSE;
1740 BOOL opt_D_used = FALSE;
1741 BOOL queue_only_set = FALSE;
1742 BOOL receiving_message = TRUE;
1743 BOOL sender_ident_set = FALSE;
1744 BOOL session_local_queue_only;
1746 BOOL removed_privilege = FALSE;
1747 BOOL usage_wanted = FALSE;
1748 BOOL verify_address_mode = FALSE;
1749 BOOL verify_as_sender = FALSE;
1750 BOOL rcpt_verify_quota = FALSE;
1751 BOOL version_printed = FALSE;
1752 uschar *alias_arg = NULL;
1753 uschar *called_as = US"";
1754 uschar *cmdline_syslog_name = NULL;
1755 uschar *start_queue_run_id = NULL;
1756 uschar *stop_queue_run_id = NULL;
1757 uschar *expansion_test_message = NULL;
1758 const uschar *ftest_domain = NULL;
1759 const uschar *ftest_localpart = NULL;
1760 const uschar *ftest_prefix = NULL;
1761 const uschar *ftest_suffix = NULL;
1762 uschar *log_oneline = NULL;
1763 uschar *malware_test_file = NULL;
1764 uschar *real_sender_address;
1765 uschar *originator_home = US"/";
1769 struct stat statbuf;
1770 pid_t passed_qr_pid = (pid_t)0;
1771 int passed_qr_pipe = -1;
1772 gid_t group_list[EXIM_GROUPLIST_SIZE];
1774 /* For the -bI: flag */
1775 enum commandline_info info_flag = CMDINFO_NONE;
1776 BOOL info_stdout = FALSE;
1778 /* Possible options for -R and -S */
1780 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1782 /* Need to define this in case we need to change the environment in order
1783 to get rid of a bogus time zone. We have to make it char rather than uschar
1784 because some OS define it in /usr/include/unistd.h. */
1786 extern char **environ;
1788 #ifdef MEASURE_TIMING
1789 (void)gettimeofday(×tamp_startup, NULL);
1792 store_init(); /* Initialise the memory allocation susbsystem */
1793 pcre_init(); /* Set up memory handling for pcre */
1795 /* If the Exim user and/or group and/or the configuration file owner/group were
1796 defined by ref:name at build time, we must now find the actual uid/gid values.
1797 This is a feature to make the lives of binary distributors easier. */
1799 #ifdef EXIM_USERNAME
1800 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1803 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1805 /* If ref:name uses a number as the name, route_finduser() returns
1806 TRUE with exim_uid set and pw coerced to NULL. */
1808 exim_gid = pw->pw_gid;
1809 #ifndef EXIM_GROUPNAME
1812 "exim: ref:name should specify a usercode, not a group.\n"
1813 "exim: can't let you get away with it unless you also specify a group.\n");
1817 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1820 #ifdef EXIM_GROUPNAME
1821 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1822 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1825 #ifdef CONFIGURE_OWNERNAME
1826 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1827 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1828 CONFIGURE_OWNERNAME);
1831 /* We default the system_filter_user to be the Exim run-time user, as a
1832 sane non-root value. */
1833 system_filter_uid = exim_uid;
1835 #ifdef CONFIGURE_GROUPNAME
1836 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1837 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1838 CONFIGURE_GROUPNAME);
1841 /* In the Cygwin environment, some initialization used to need doing.
1842 It was fudged in by means of this macro; now no longer but we'll leave
1843 it in case of others. */
1849 /* Check a field which is patched when we are running Exim within its
1850 testing harness; do a fast initial check, and then the whole thing. */
1852 f.running_in_test_harness =
1853 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1854 if (f.running_in_test_harness)
1857 /* Protect against abusive argv[0] */
1858 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1859 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1861 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1862 at the start of a program; however, it seems that some environments do not
1863 follow this. A "strange" locale can affect the formatting of timestamps, so we
1866 setlocale(LC_ALL, "C");
1868 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1870 #ifdef _POSIX_MONOTONIC_CLOCK
1874 /* Set up the default handler for timing using alarm(). */
1876 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1878 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1879 because store_malloc writes a log entry on failure. */
1881 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1882 exim_fail("exim: failed to get store for log buffer\n");
1884 /* Initialize the default log options. */
1886 bits_set(log_selector, log_selector_size, log_default);
1888 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1889 NULL when the daemon is run and the file is closed. We have to use this
1890 indirection, because some systems don't allow writing to the variable "stderr".
1893 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1895 /* Ensure there is a big buffer for temporary use in several places. It is put
1896 in malloc store so that it can be freed for enlargement if necessary. */
1898 big_buffer = store_malloc(big_buffer_size);
1900 /* Set up the handler for the data request signal, and set the initial
1901 descriptive text. */
1903 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1904 set_process_info("initializing");
1905 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1908 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1909 sigaction(SIGSEGV, &act, NULL);
1912 signal(SIGSEGV, segv_handler); /* log faults */
1915 /* If running in a dockerized environment, the TERM signal is only
1916 delegated to the PID 1 if we request it by setting an signal handler */
1917 if (getpid() == 1) signal(SIGTERM, term_handler);
1919 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1920 in the daemon code. For the rest of Exim's uses, we ignore it. */
1922 signal(SIGHUP, SIG_IGN);
1924 /* We don't want to die on pipe errors as the code is written to handle
1925 the write error instead. */
1927 signal(SIGPIPE, SIG_IGN);
1929 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1930 set to SIG_IGN. This causes subprocesses that complete before the parent
1931 process waits for them not to hang around, so when Exim calls wait(), nothing
1932 is there. The wait() code has been made robust against this, but let's ensure
1933 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1934 ending status. We use sigaction rather than plain signal() on those OS where
1935 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1936 problem on AIX with this.) */
1940 struct sigaction act;
1941 act.sa_handler = SIG_DFL;
1942 sigemptyset(&(act.sa_mask));
1944 sigaction(SIGCHLD, &act, NULL);
1947 signal(SIGCHLD, SIG_DFL);
1950 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1955 /* Set up the version number. Set up the leading 'E' for the external form of
1956 message ids, set the pointer to the internal form, and initialize it to
1957 indicate no message being processed. */
1960 message_id_option[0] = '-';
1961 message_id_external = message_id_option + 1;
1962 message_id_external[0] = 'E';
1963 message_id = message_id_external + 1;
1966 /* Set the umask to zero so that any files Exim creates using open() are
1967 created with the modes that it specifies. NOTE: Files created with fopen() have
1968 a problem, which was not recognized till rather late (February 2006). With this
1969 umask, such files will be world writeable. (They are all content scanning files
1970 in the spool directory, which isn't world-accessible, so this is not a
1971 disaster, but it's untidy.) I don't want to change this overall setting,
1972 however, because it will interact badly with the open() calls. Instead, there's
1973 now a function called modefopen() that fiddles with the umask while calling
1978 /* Precompile the regular expression for matching a message id. Keep this in
1979 step with the code that generates ids in the accept.c module. We need to do
1980 this here, because the -M options check their arguments for syntactic validity
1981 using mac_ismsgid, which uses this. */
1984 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1986 /* Precompile the regular expression that is used for matching an SMTP error
1987 code, possibly extended, at the start of an error message. Note that the
1988 terminating whitespace character is included. */
1991 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1994 #ifdef WHITELIST_D_MACROS
1995 /* Precompile the regular expression used to filter the content of macros
1996 given to -D for permissibility. */
1998 regex_whitelisted_macro =
1999 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
2002 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
2004 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2005 this seems to be a generally accepted convention, since one finds symbolic
2006 links called "mailq" in standard OS configurations. */
2008 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2009 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2012 receiving_message = FALSE;
2013 called_as = US"-mailq";
2016 /* If the program is called as "rmail" treat it as equivalent to
2017 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2018 i.e. preventing a single dot on a line from terminating the message, and
2019 returning with zero return code, even in cases of error (provided an error
2020 message has been sent). */
2022 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2023 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2026 called_as = US"-rmail";
2027 errors_sender_rc = EXIT_SUCCESS;
2030 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2031 this is a smail convention. */
2033 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2034 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2036 smtp_input = smtp_batched_input = TRUE;
2037 called_as = US"-rsmtp";
2040 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2041 this is a smail convention. */
2043 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2044 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2047 receiving_message = FALSE;
2048 called_as = US"-runq";
2051 /* If the program is called as "newaliases" treat it as equivalent to
2052 "exim -bi"; this is a sendmail convention. */
2054 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2055 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2058 receiving_message = FALSE;
2059 called_as = US"-newaliases";
2062 /* Save the original effective uid for a couple of uses later. It should
2063 normally be root, but in some esoteric environments it may not be. */
2065 original_euid = geteuid();
2066 original_egid = getegid();
2068 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2069 to be the same as the real ones. This makes a difference only if Exim is setuid
2070 (or setgid) to something other than root, which could be the case in some
2071 special configurations. */
2073 real_uid = getuid();
2074 real_gid = getgid();
2076 if (real_uid == root_uid)
2078 if ((rv = setgid(real_gid)))
2079 exim_fail("exim: setgid(%ld) failed: %s\n",
2080 (long int)real_gid, strerror(errno));
2081 if ((rv = setuid(real_uid)))
2082 exim_fail("exim: setuid(%ld) failed: %s\n",
2083 (long int)real_uid, strerror(errno));
2086 /* If neither the original real uid nor the original euid was root, Exim is
2087 running in an unprivileged state. */
2089 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2091 /* For most of the args-parsing we need to use permanent pool memory */
2093 int old_pool = store_pool;
2094 store_pool = POOL_PERM;
2096 /* Scan the program's arguments. Some can be dealt with right away; others are
2097 simply recorded for checking and handling afterwards. Do a high-level switch
2098 on the second character (the one after '-'), to save some effort. */
2100 for (i = 1; i < argc; i++)
2102 BOOL badarg = FALSE;
2103 uschar * arg = argv[i];
2107 /* An argument not starting with '-' is the start of a recipients list;
2108 break out of the options-scanning loop. */
2116 /* An option consisting of -- terminates the options */
2118 if (Ustrcmp(arg, "--") == 0)
2120 recipients_arg = i + 1;
2124 /* Handle flagged options */
2126 switchchar = arg[1];
2129 /* Make all -ex options synonymous with -oex arguments, since that
2130 is assumed by various callers. Also make -qR options synonymous with -R
2131 options, as that seems to be required as well. Allow for -qqR too, and
2132 the same for -S options. */
2134 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2135 Ustrncmp(arg+1, "qR", 2) == 0 ||
2136 Ustrncmp(arg+1, "qS", 2) == 0)
2138 switchchar = arg[2];
2141 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2143 switchchar = arg[3];
2145 f.queue_2stage = TRUE;
2148 /* Make -r synonymous with -f, since it is a documented alias */
2150 else if (arg[1] == 'r') switchchar = 'f';
2152 /* Make -ov synonymous with -v */
2154 else if (Ustrcmp(arg, "-ov") == 0)
2160 /* deal with --option_aliases */
2161 else if (switchchar == '-')
2163 if (Ustrcmp(argrest, "help") == 0)
2165 usage_wanted = TRUE;
2168 else if (Ustrcmp(argrest, "version") == 0)
2175 /* High-level switch on active initial letter */
2180 /* sendmail uses -Ac and -Am to control which .cf file is used;
2183 if (!*argrest) { badarg = TRUE; break; }
2186 BOOL ignore = FALSE;
2191 if (*(argrest + 1) == '\0')
2195 if (!ignore) badarg = TRUE;
2199 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2200 so has no need of it. */
2203 if (!*argrest) i++; /* Skip over the type */
2209 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2213 /* -bd: Run in daemon mode, awaiting SMTP connections.
2214 -bdf: Ditto, but in the foreground.
2217 f.daemon_listen = TRUE;
2218 if (*argrest == 'f') f.background_daemon = FALSE;
2219 else if (*argrest) badarg = TRUE;
2222 /* -be: Run in expansion test mode
2223 -bem: Ditto, but read a message from a file first
2226 expansion_test = checking = TRUE;
2227 if (*argrest == 'm')
2229 if (++i >= argc) { badarg = TRUE; break; }
2230 expansion_test_message = argv[i];
2233 if (*argrest) badarg = TRUE;
2236 /* -bF: Run system filter test */
2238 filter_test |= checking = FTEST_SYSTEM;
2239 if (*argrest) badarg = TRUE;
2240 else if (++i < argc) filter_test_sfile = argv[i];
2241 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2244 /* -bf: Run user filter test
2245 -bfd: Set domain for filter testing
2246 -bfl: Set local part for filter testing
2247 -bfp: Set prefix for filter testing
2248 -bfs: Set suffix for filter testing
2253 filter_test |= checking = FTEST_USER;
2254 if (++i < argc) filter_test_ufile = argv[i];
2255 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2260 exim_fail("exim: string expected after %s\n", arg);
2261 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2262 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2263 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2264 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2269 /* -bh: Host checking - an IP address must follow. */
2271 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2273 if (++i >= argc) { badarg = TRUE; break; }
2274 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2275 host_checking = checking = f.log_testing_mode = TRUE;
2276 f.host_checking_callout = *argrest == 'c';
2277 message_logs = FALSE;
2282 /* -bi: This option is used by sendmail to initialize *the* alias file,
2283 though it has the -oA option to specify a different file. Exim has no
2284 concept of *the* alias file, but since Sun's YP make script calls
2285 sendmail this way, some support must be provided. */
2287 if (!*argrest) bi_option = TRUE;
2291 /* -bI: provide information, of the type to follow after a colon.
2292 This is an Exim flag. */
2294 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2296 uschar *p = argrest+1;
2297 info_flag = CMDINFO_HELP;
2299 if (strcmpic(p, CUS"sieve") == 0)
2301 info_flag = CMDINFO_SIEVE;
2304 else if (strcmpic(p, CUS"dscp") == 0)
2306 info_flag = CMDINFO_DSCP;
2309 else if (strcmpic(p, CUS"help") == 0)
2315 /* -bm: Accept and deliver message - the default option. Reinstate
2316 receiving_message, which got turned off for all -b options.
2317 -bmalware: test the filename given for malware */
2319 if (!*argrest) receiving_message = TRUE;
2320 else if (Ustrcmp(argrest, "alware") == 0)
2322 if (++i >= argc) { badarg = TRUE; break; }
2324 malware_test_file = argv[i];
2329 /* -bnq: For locally originating messages, do not qualify unqualified
2330 addresses. In the envelope, this causes errors; in header lines they
2333 if (Ustrcmp(argrest, "q") == 0)
2335 f.allow_unqualified_sender = FALSE;
2336 f.allow_unqualified_recipient = FALSE;
2341 /* -bpxx: List the contents of the mail queue, in various forms. If
2342 the option is -bpc, just a queue count is needed. Otherwise, if the
2343 first letter after p is r, then order is random. */
2345 if (*argrest == 'c')
2348 if (*++argrest) badarg = TRUE;
2352 if (*argrest == 'r')
2354 list_queue_option = 8;
2357 else list_queue_option = 0;
2361 /* -bp: List the contents of the mail queue, top-level only */
2365 /* -bpu: List the contents of the mail queue, top-level undelivered */
2367 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2369 /* -bpa: List the contents of the mail queue, including all delivered */
2371 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2373 /* Unknown after -bp[r] */
2379 /* -bP: List the configuration variables given as the address list.
2380 Force -v, so configuration errors get displayed. */
2383 /* -bP config: we need to setup here, because later,
2384 when list_options is checked, the config is read already */
2387 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2390 readconf_save_config(version_string);
2394 list_options = TRUE;
2395 debug_selector |= D_v;
2396 debug_file = stderr;
2400 /* -brt: Test retry configuration lookup */
2402 if (Ustrcmp(argrest, "t") == 0)
2405 test_retry_arg = i + 1;
2409 /* -brw: Test rewrite configuration */
2411 else if (Ustrcmp(argrest, "w") == 0)
2414 test_rewrite_arg = i + 1;
2420 /* -bS: Read SMTP commands on standard input, but produce no replies -
2421 all errors are reported by sending messages. */
2424 smtp_input = smtp_batched_input = receiving_message = TRUE;
2428 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2429 on standard output. */
2431 if (!*argrest) smtp_input = receiving_message = TRUE;
2435 /* -bt: address testing mode */
2438 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2442 /* -bv: verify addresses */
2445 verify_address_mode = checking = f.log_testing_mode = TRUE;
2447 /* -bvs: verify sender addresses */
2449 else if (Ustrcmp(argrest, "s") == 0)
2451 verify_address_mode = checking = f.log_testing_mode = TRUE;
2452 verify_as_sender = TRUE;
2457 /* -bV: Print version string and support details */
2461 printf("Exim version %s #%s built %s\n", version_string,
2462 version_cnumber, version_date);
2463 printf("%s\n", CS version_copyright);
2464 version_printed = TRUE;
2465 show_whats_supported(TRUE);
2466 f.log_testing_mode = TRUE;
2471 /* -bw: inetd wait mode, accept a listening socket as stdin */
2473 f.inetd_wait_mode = TRUE;
2474 f.background_daemon = FALSE;
2475 f.daemon_listen = TRUE;
2477 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2478 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2489 /* -C: change configuration file list; ignore if it isn't really
2490 a change! Enforce a prefix check if required. */
2494 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2495 if (Ustrcmp(config_main_filelist, argrest) != 0)
2497 #ifdef ALT_CONFIG_PREFIX
2499 int len = Ustrlen(ALT_CONFIG_PREFIX);
2500 const uschar *list = argrest;
2502 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2503 while((filename = string_nextinlist(&list, &sep, big_buffer,
2505 if ( ( Ustrlen(filename) < len
2506 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2507 || Ustrstr(filename, "/../") != NULL
2509 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2511 exim_fail("-C Permission denied\n");
2513 if (real_uid != root_uid)
2515 #ifdef TRUSTED_CONFIG_LIST
2517 if (real_uid != exim_uid
2518 #ifdef CONFIGURE_OWNER
2519 && real_uid != config_uid
2522 f.trusted_config = FALSE;
2525 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2528 struct stat statbuf;
2530 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2531 (statbuf.st_uid != root_uid /* owner not root */
2532 #ifdef CONFIGURE_OWNER
2533 && statbuf.st_uid != config_uid /* owner not the special one */
2536 (statbuf.st_gid != root_gid /* group not root */
2537 #ifdef CONFIGURE_GROUP
2538 && statbuf.st_gid != config_gid /* group not the special one */
2540 && (statbuf.st_mode & 020) != 0 /* group writeable */
2542 (statbuf.st_mode & 2) != 0) /* world writeable */
2544 f.trusted_config = FALSE;
2549 /* Well, the trust list at least is up to scratch... */
2551 uschar *trusted_configs[32];
2554 int old_pool = store_pool;
2555 store_pool = POOL_MAIN;
2557 reset_point = store_mark();
2558 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2560 uschar *start = big_buffer, *nl;
2561 while (*start && isspace(*start))
2565 nl = Ustrchr(start, '\n');
2568 trusted_configs[nr_configs++] = string_copy(start);
2569 if (nr_configs == nelem(trusted_configs))
2577 const uschar *list = argrest;
2579 while (f.trusted_config && (filename = string_nextinlist(&list,
2580 &sep, big_buffer, big_buffer_size)))
2582 for (i=0; i < nr_configs; i++)
2583 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2585 if (i == nr_configs)
2587 f.trusted_config = FALSE;
2592 else /* No valid prefixes found in trust_list file. */
2593 f.trusted_config = FALSE;
2594 store_reset(reset_point);
2595 store_pool = old_pool;
2598 else /* Could not open trust_list file. */
2599 f.trusted_config = FALSE;
2602 /* Not root; don't trust config */
2603 f.trusted_config = FALSE;
2607 config_main_filelist = argrest;
2608 f.config_changed = TRUE;
2613 /* -D: set up a macro definition */
2616 #ifdef DISABLE_D_OPTION
2617 exim_fail("exim: -D is not available in this Exim binary\n");
2623 uschar *s = argrest;
2626 while (isspace(*s)) s++;
2628 if (*s < 'A' || *s > 'Z')
2629 exim_fail("exim: macro name set by -D must start with "
2630 "an upper case letter\n");
2632 while (isalnum(*s) || *s == '_')
2634 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2638 if (ptr == 0) { badarg = TRUE; break; }
2639 while (isspace(*s)) s++;
2642 if (*s++ != '=') { badarg = TRUE; break; }
2643 while (isspace(*s)) s++;
2646 for (m = macros_user; m; m = m->next)
2647 if (Ustrcmp(m->name, name) == 0)
2648 exim_fail("exim: duplicated -D in command line\n");
2650 m = macro_create(name, s, TRUE);
2652 if (clmacro_count >= MAX_CLMACROS)
2653 exim_fail("exim: too many -D options on command line\n");
2654 clmacros[clmacro_count++] =
2655 string_sprintf("-D%s=%s", m->name, m->replacement);
2660 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2661 The latter is now a no-op, retained for compatibility only. If -dd is used,
2662 debugging subprocesses of the daemon is disabled. */
2665 if (Ustrcmp(argrest, "ropcr") == 0)
2667 /* drop_cr = TRUE; */
2670 /* Use an intermediate variable so that we don't set debugging while
2671 decoding the debugging bits. */
2675 unsigned int selector = D_default;
2678 if (*argrest == 'd')
2680 f.debug_daemon = TRUE;
2684 decode_bits(&selector, 1, debug_notall, argrest,
2685 debug_options, debug_options_count, US"debug", 0);
2686 debug_selector = selector;
2691 /* -E: This is a local error message. This option is not intended for
2692 external use at all, but is not restricted to trusted callers because it
2693 does no harm (just suppresses certain error messages) and if Exim is run
2694 not setuid root it won't always be trusted when it generates error
2695 messages using this option. If there is a message id following -E, point
2696 message_reference at it, for logging. */
2699 f.local_error_message = TRUE;
2700 if (mac_ismsgid(argrest)) message_reference = argrest;
2704 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2705 option, so it looks as if historically the -oex options are also callable
2706 without the leading -o. So we have to accept them. Before the switch,
2707 anything starting -oe has been converted to -e. Exim does not support all
2708 of the sendmail error options. */
2711 if (Ustrcmp(argrest, "e") == 0)
2713 arg_error_handling = ERRORS_SENDER;
2714 errors_sender_rc = EXIT_SUCCESS;
2716 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2717 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2718 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2719 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2724 /* -F: Set sender's full name, used instead of the gecos entry from
2725 the password file. Since users can usually alter their gecos entries,
2726 there's no security involved in using this instead. The data can follow
2727 the -F or be in the next argument. */
2731 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2732 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2733 f.sender_name_forced = TRUE;
2737 /* -f: Set sender's address - this value is only actually used if Exim is
2738 run by a trusted user, or if untrusted_set_sender is set and matches the
2739 address, except that the null address can always be set by any user. The
2740 test for this happens later, when the value given here is ignored when not
2741 permitted. For an untrusted user, the actual sender is still put in Sender:
2742 if it doesn't match the From: header (unless no_local_from_check is set).
2743 The data can follow the -f or be in the next argument. The -r switch is an
2744 obsolete form of -f but since there appear to be programs out there that
2745 use anything that sendmail has ever supported, better accept it - the
2746 synonymizing is done before the switch above.
2748 At this stage, we must allow domain literal addresses, because we don't
2749 know what the setting of allow_domain_literals is yet. Ditto for trailing
2750 dots and strip_trailing_dot. */
2754 int dummy_start, dummy_end;
2757 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2758 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2760 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2763 uschar * temp = argrest + Ustrlen(argrest) - 1;
2764 while (temp >= argrest && isspace(*temp)) temp--;
2765 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2766 allow_domain_literals = TRUE;
2767 strip_trailing_dot = TRUE;
2769 allow_utf8_domains = TRUE;
2771 if (!(sender_address = parse_extract_address(argrest, &errmess,
2772 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2773 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2775 sender_address = string_copy_taint(sender_address, TRUE);
2777 message_smtputf8 = string_is_utf8(sender_address);
2778 allow_utf8_domains = FALSE;
2780 allow_domain_literals = FALSE;
2781 strip_trailing_dot = FALSE;
2783 f.sender_address_forced = TRUE;
2787 /* -G: sendmail invocation to specify that it's a gateway submission and
2788 sendmail may complain about problems instead of fixing them.
2789 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2790 not at this time complain about problems. */
2796 /* -h: Set the hop count for an incoming message. Exim does not currently
2797 support this; it always computes it by counting the Received: headers.
2798 To put it in will require a change to the spool header file format. */
2802 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2803 if (!isdigit(*argrest)) badarg = TRUE;
2807 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2808 not to be documented for sendmail but mailx (at least) uses it) */
2811 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2815 /* -L: set the identifier used for syslog; equivalent to setting
2816 syslog_processname in the config file, but needs to be an admin option. */
2820 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2821 if ((sz = Ustrlen(argrest)) > 32)
2822 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2824 exim_fail("exim: the -L syslog name is too short\n");
2825 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2829 receiving_message = FALSE;
2831 /* -MC: continue delivery of another message via an existing open
2832 file descriptor. This option is used for an internal call by the
2833 smtp transport when there is a pending message waiting to go to an
2834 address to which it has got a connection. Five subsequent arguments are
2835 required: transport name, host name, IP address, sequence number, and
2836 message_id. Transports may decline to create new processes if the sequence
2837 number gets too big. The channel is stdin. This (-MC) must be the last
2838 argument. There's a subsequent check that the real-uid is privileged.
2840 If we are running in the test harness. delay for a bit, to let the process
2841 that set this one up complete. This makes for repeatability of the logging,
2844 if (Ustrcmp(argrest, "C") == 0)
2846 union sockaddr_46 interface_sock;
2847 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2850 exim_fail("exim: too many or too few arguments after -MC\n");
2852 if (msg_action_arg >= 0)
2853 exim_fail("exim: incompatible arguments\n");
2855 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2856 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2857 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2858 continue_sequence = Uatoi(argv[++i]);
2859 msg_action = MSG_DELIVER;
2860 msg_action_arg = ++i;
2861 forced_delivery = TRUE;
2862 queue_run_pid = passed_qr_pid;
2863 queue_run_pipe = passed_qr_pipe;
2865 if (!mac_ismsgid(argv[i]))
2866 exim_fail("exim: malformed message id %s after -MC option\n",
2869 /* Set up $sending_ip_address and $sending_port, unless proxied */
2871 if (!continue_proxy_cipher)
2872 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2874 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2877 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2880 testharness_pause_ms(500);
2884 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2888 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2889 precedes -MC (see above). The flag indicates that the host to which
2890 Exim is connected has accepted an AUTH sequence. */
2892 case 'A': f.smtp_authenticated = TRUE; break;
2894 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2895 that exim is connected to supports the esmtp extension DSN */
2897 case 'D': smtp_peer_options |= OPTION_DSN; break;
2899 /* -MCd: for debug, set a process-purpose string */
2901 case 'd': if (++i < argc)
2902 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2906 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2907 from the commandline should be tainted - but we will need an untainted
2908 value for the spoolfile when doing a -odi delivery process. */
2910 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2914 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2916 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2918 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2919 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2920 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2922 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2924 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2929 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2930 it preceded -MC (see above) */
2932 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2934 #ifdef SUPPORT_SOCKS
2935 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2936 case 'p': proxy_session = TRUE;
2939 proxy_local_address = string_copy_taint(argv[i], TRUE);
2942 proxy_local_port = Uatoi(argv[i]);
2945 proxy_external_address = string_copy_taint(argv[i], TRUE);
2948 proxy_external_port = Uatoi(argv[i]);
2954 /* -MCQ: pass on the pid of the queue-running process that started
2955 this chain of deliveries and the fd of its synchronizing pipe; this
2956 is useful only when it precedes -MC (see above) */
2958 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2960 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2964 /* -MCq: do a quota check on the given recipient for the given size
2965 of message. Separate from -MC. */
2966 case 'q': rcpt_verify_quota = TRUE;
2967 if (++i < argc) message_size = Uatoi(argv[i]);
2971 /* -MCS: set the smtp_use_size flag; this is useful only when it
2972 precedes -MC (see above) */
2974 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2977 /* -MCs: used with -MCt; SNI was sent */
2978 /* -MCr: ditto, DANE */
2981 case 's': if (++i < argc)
2983 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
2984 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
2989 /* -MCt: similar to -MCT below but the connection is still open
2990 via a proxy process which handles the TLS context and coding.
2991 Require three arguments for the proxied local address and port,
2992 and the TLS cipher. */
2994 case 't': if (++i < argc)
2995 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
2998 sending_port = (int)(Uatol(argv[i]));
3001 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
3005 /* -MCT: set the tls_offered flag; this is useful only when it
3006 precedes -MC (see above). The flag indicates that the host to which
3007 Exim is connected has offered TLS support. */
3009 case 'T': smtp_peer_options |= OPTION_TLS; break;
3012 default: badarg = TRUE; break;
3017 /* -M[x]: various operations on the following list of message ids:
3018 -M deliver the messages, ignoring next retry times and thawing
3019 -Mc deliver the messages, checking next retry times, no thawing
3020 -Mf freeze the messages
3021 -Mg give up on the messages
3022 -Mt thaw the messages
3023 -Mrm remove the messages
3024 In the above cases, this must be the last option. There are also the
3025 following options which are followed by a single message id, and which
3026 act on that message. Some of them use the "recipient" addresses as well.
3027 -Mar add recipient(s)
3028 -MG move to a different queue
3029 -Mmad mark all recipients delivered
3030 -Mmd mark recipients(s) delivered
3032 -Mset load a message for use with -be
3034 -Mvc show copy (of whole message, in RFC 2822 format)
3041 msg_action = MSG_DELIVER;
3042 forced_delivery = f.deliver_force_thaw = TRUE;
3044 else if (Ustrcmp(argrest, "ar") == 0)
3046 msg_action = MSG_ADD_RECIPIENT;
3047 one_msg_action = TRUE;
3049 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3050 else if (Ustrcmp(argrest, "es") == 0)
3052 msg_action = MSG_EDIT_SENDER;
3053 one_msg_action = TRUE;
3055 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3056 else if (Ustrcmp(argrest, "g") == 0)
3058 msg_action = MSG_DELIVER;
3059 deliver_give_up = TRUE;
3061 else if (Ustrcmp(argrest, "G") == 0)
3063 msg_action = MSG_SETQUEUE;
3064 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
3066 else if (Ustrcmp(argrest, "mad") == 0)
3068 msg_action = MSG_MARK_ALL_DELIVERED;
3070 else if (Ustrcmp(argrest, "md") == 0)
3072 msg_action = MSG_MARK_DELIVERED;
3073 one_msg_action = TRUE;
3075 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3076 else if (Ustrcmp(argrest, "set") == 0)
3078 msg_action = MSG_LOAD;
3079 one_msg_action = TRUE;
3081 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3082 else if (Ustrcmp(argrest, "vb") == 0)
3084 msg_action = MSG_SHOW_BODY;
3085 one_msg_action = TRUE;
3087 else if (Ustrcmp(argrest, "vc") == 0)
3089 msg_action = MSG_SHOW_COPY;
3090 one_msg_action = TRUE;
3092 else if (Ustrcmp(argrest, "vh") == 0)
3094 msg_action = MSG_SHOW_HEADER;
3095 one_msg_action = TRUE;
3097 else if (Ustrcmp(argrest, "vl") == 0)
3099 msg_action = MSG_SHOW_LOG;
3100 one_msg_action = TRUE;
3102 else { badarg = TRUE; break; }
3104 /* All the -Mxx options require at least one message id. */
3106 msg_action_arg = i + 1;
3107 if (msg_action_arg >= argc)
3108 exim_fail("exim: no message ids given after %s option\n", arg);
3110 /* Some require only message ids to follow */
3112 if (!one_msg_action)
3114 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3115 exim_fail("exim: malformed message id %s after %s option\n",
3117 goto END_ARG; /* Remaining args are ids */
3120 /* Others require only one message id, possibly followed by addresses,
3121 which will be handled as normal arguments. */
3125 if (!mac_ismsgid(argv[msg_action_arg]))
3126 exim_fail("exim: malformed message id %s after %s option\n",
3127 argv[msg_action_arg], arg);
3133 /* Some programs seem to call the -om option without the leading o;
3134 for sendmail it askes for "me too". Exim always does this. */
3137 if (*argrest) badarg = TRUE;
3141 /* -N: don't do delivery - a debugging option that stops transports doing
3142 their thing. It implies debugging at the D_v level. */
3147 f.dont_deliver = TRUE;
3148 debug_selector |= D_v;
3149 debug_file = stderr;
3155 /* -n: This means "don't alias" in sendmail, apparently.
3156 For normal invocations, it has no effect.
3157 It may affect some other options. */
3163 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3164 option to the specified value. This form uses long names. We need to handle
3165 -O option=value and -Ooption=value. */
3170 exim_fail("exim: string expected after -O\n");
3176 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3179 if (!*(alias_arg = argrest))
3180 if (i+1 < argc) alias_arg = argv[++i];
3181 else exim_fail("exim: string expected after -oA\n");
3184 /* -oB: Set a connection message max value for remote deliveries */
3187 uschar * p = argrest;
3189 if (i+1 < argc && isdigit((argv[i+1][0])))
3193 connection_max_messages = 1;
3200 exim_fail("exim: number expected after -oB\n");
3201 connection_max_messages = Uatoi(p);
3206 /* -odb: background delivery */
3209 if (Ustrcmp(argrest, "b") == 0)
3211 f.synchronous_delivery = FALSE;
3212 arg_queue_only = FALSE;
3213 queue_only_set = TRUE;
3216 /* -odd: testsuite-only: add no inter-process delays */
3218 else if (Ustrcmp(argrest, "d") == 0)
3219 f.testsuite_delays = FALSE;
3221 /* -odf: foreground delivery (smail-compatible option); same effect as
3222 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3225 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3227 f.synchronous_delivery = TRUE;
3228 arg_queue_only = FALSE;
3229 queue_only_set = TRUE;
3232 /* -odq: queue only */
3234 else if (Ustrcmp(argrest, "q") == 0)
3236 f.synchronous_delivery = FALSE;
3237 arg_queue_only = TRUE;
3238 queue_only_set = TRUE;
3241 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3242 but no remote delivery */
3244 else if (Ustrcmp(argrest, "qs") == 0)
3246 f.queue_smtp = TRUE;
3247 arg_queue_only = FALSE;
3248 queue_only_set = TRUE;
3253 /* -oex: Sendmail error flags. As these are also accepted without the
3254 leading -o prefix, for compatibility with vacation and other callers,
3255 they are handled with -e above. */
3257 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3258 -oitrue: Another sendmail syntax for the same */
3261 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3266 /* -oM*: Set various characteristics for an incoming message; actually
3267 acted on for trusted callers only. */
3272 exim_fail("exim: data expected after -oM%s\n", argrest);
3274 /* -oMa: Set sender host address */
3276 if (Ustrcmp(argrest, "a") == 0)
3277 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3279 /* -oMaa: Set authenticator name */
3281 else if (Ustrcmp(argrest, "aa") == 0)
3282 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3284 /* -oMas: setting authenticated sender */
3286 else if (Ustrcmp(argrest, "as") == 0)
3287 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3289 /* -oMai: setting authenticated id */
3291 else if (Ustrcmp(argrest, "ai") == 0)
3292 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3294 /* -oMi: Set incoming interface address */
3296 else if (Ustrcmp(argrest, "i") == 0)
3297 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3299 /* -oMm: Message reference */
3301 else if (Ustrcmp(argrest, "m") == 0)
3303 if (!mac_ismsgid(argv[i+1]))
3304 exim_fail("-oMm must be a valid message ID\n");
3305 if (!f.trusted_config)
3306 exim_fail("-oMm must be called by a trusted user/config\n");
3307 message_reference = argv[++i];
3310 /* -oMr: Received protocol */
3312 else if (Ustrcmp(argrest, "r") == 0)
3314 if (received_protocol)
3315 exim_fail("received_protocol is set already\n");
3317 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3319 /* -oMs: Set sender host name */
3321 else if (Ustrcmp(argrest, "s") == 0)
3322 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3324 /* -oMt: Set sender ident */
3326 else if (Ustrcmp(argrest, "t") == 0)
3328 sender_ident_set = TRUE;
3329 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3332 /* Else a bad argument */
3339 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3340 seem to call this as -m (undocumented), so that is also accepted (see
3342 /* -oo: An ancient flag for old-style addresses which still seems to
3343 crop up in some calls (see in SCO). */
3347 if (*argrest) badarg = TRUE;
3350 /* -oP <name>: set pid file path for daemon
3351 -oPX: delete pid file of daemon */
3354 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3355 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3356 "(uid=%d euid=%d | %d)\n",
3357 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3358 if (!*argrest) override_pid_file_path = argv[++i];
3359 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3364 /* -or <n>: set timeout for non-SMTP acceptance
3365 -os <n>: set timeout for SMTP acceptance */
3370 int * tp = argrest[-1] == 'r'
3371 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3373 *tp = readconf_readtime(argrest, 0, FALSE);
3374 else if (i+1 < argc)
3375 *tp = readconf_readtime(argv[++i], 0, FALSE);
3378 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3382 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3383 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3386 if (*argrest) badarg = TRUE;
3387 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3390 /* -oY: Override creation of daemon notifier socket */
3393 if (*argrest) badarg = TRUE;
3394 else notifier_socket = NULL;
3397 /* Unknown -o argument */
3405 /* -ps: force Perl startup; -pd force delayed Perl startup */
3409 if (*argrest == 's' && argrest[1] == 0)
3411 perl_start_option = 1;
3414 if (*argrest == 'd' && argrest[1] == 0)
3416 perl_start_option = -1;
3421 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3422 which sets the host protocol and host name */
3425 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3429 uschar * hn = Ustrchr(argrest, ':');
3431 if (received_protocol)
3432 exim_fail("received_protocol is set already\n");
3435 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3438 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3439 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3440 sender_host_name = string_copy_taint(hn + 1, TRUE);
3447 receiving_message = FALSE;
3448 if (queue_interval >= 0)
3449 exim_fail("exim: -q specified more than once\n");
3451 /* -qq...: Do queue runs in a 2-stage manner */
3453 if (*argrest == 'q')
3455 f.queue_2stage = TRUE;
3459 /* -qi...: Do only first (initial) deliveries */
3461 if (*argrest == 'i')
3463 f.queue_run_first_delivery = TRUE;
3467 /* -qf...: Run the queue, forcing deliveries
3468 -qff..: Ditto, forcing thawing as well */
3470 if (*argrest == 'f')
3472 f.queue_run_force = TRUE;
3473 if (*++argrest == 'f')
3475 f.deliver_force_thaw = TRUE;
3480 /* -q[f][f]l...: Run the queue only on local deliveries */
3482 if (*argrest == 'l')
3484 f.queue_run_local = TRUE;
3488 /* -q[f][f][l][G<name>]... Work on the named queue */
3490 if (*argrest == 'G')
3493 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3494 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3495 queue_name = string_copyn(argrest, i);
3497 if (*argrest == '/') argrest++;
3500 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3501 only, optionally named, optionally starting from a given message id. */
3503 if (!(list_queue || count_queue))
3505 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3508 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3509 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3510 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3511 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3514 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3515 forced, optionally local only, optionally named. */
3517 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3519 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3523 case 'R': /* Synonymous with -qR... */
3525 const uschar *tainted_selectstr;
3527 receiving_message = FALSE;
3529 /* -Rf: As -R (below) but force all deliveries,
3530 -Rff: Ditto, but also thaw all frozen messages,
3531 -Rr: String is regex
3532 -Rrf: Regex and force
3533 -Rrff: Regex and force and thaw
3535 in all cases provided there are no further characters in this
3539 for (int i = 0; i < nelem(rsopts); i++)
3540 if (Ustrcmp(argrest, rsopts[i]) == 0)
3542 if (i != 2) f.queue_run_force = TRUE;
3543 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3544 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3545 argrest += Ustrlen(rsopts[i]);
3548 /* -R: Set string to match in addresses for forced queue run to
3549 pick out particular messages. */
3551 /* Avoid attacks from people providing very long strings, and do so before
3554 tainted_selectstr = argrest;
3555 else if (i+1 < argc)
3556 tainted_selectstr = argv[++i];
3558 exim_fail("exim: string expected after -R\n");
3559 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3563 /* -r: an obsolete synonym for -f (see above) */
3566 /* -S: Like -R but works on sender. */
3568 case 'S': /* Synonymous with -qS... */
3570 const uschar *tainted_selectstr;
3572 receiving_message = FALSE;
3574 /* -Sf: As -S (below) but force all deliveries,
3575 -Sff: Ditto, but also thaw all frozen messages,
3576 -Sr: String is regex
3577 -Srf: Regex and force
3578 -Srff: Regex and force and thaw
3580 in all cases provided there are no further characters in this
3584 for (int i = 0; i < nelem(rsopts); i++)
3585 if (Ustrcmp(argrest, rsopts[i]) == 0)
3587 if (i != 2) f.queue_run_force = TRUE;
3588 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3589 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3590 argrest += Ustrlen(rsopts[i]);
3593 /* -S: Set string to match in addresses for forced queue run to
3594 pick out particular messages. */
3597 tainted_selectstr = argrest;
3598 else if (i+1 < argc)
3599 tainted_selectstr = argv[++i];
3601 exim_fail("exim: string expected after -S\n");
3602 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3606 /* -Tqt is an option that is exclusively for use by the testing suite.
3607 It is not recognized in other circumstances. It allows for the setting up
3608 of explicit "queue times" so that various warning/retry things can be
3609 tested. Otherwise variability of clock ticks etc. cause problems. */
3612 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3613 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3618 /* -t: Set flag to extract recipients from body of message. */
3621 if (!*argrest) extract_recipients = TRUE;
3623 /* -ti: Set flag to extract recipients from body of message, and also
3624 specify that dot does not end the message. */
3626 else if (Ustrcmp(argrest, "i") == 0)
3628 extract_recipients = TRUE;
3632 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3635 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3642 /* -U: This means "initial user submission" in sendmail, apparently. The
3643 doc claims that in future sendmail may refuse syntactically invalid
3644 messages instead of fixing them. For the moment, we just ignore it. */
3650 /* -v: verify things - this is a very low-level debugging */
3655 debug_selector |= D_v;
3656 debug_file = stderr;
3662 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3664 The -x flag tells the sendmail command that mail from a local
3665 mail program has National Language Support (NLS) extended characters
3666 in the body of the mail item. The sendmail command can send mail with
3667 extended NLS characters across networks that normally corrupts these
3670 As Exim is 8-bit clean, it just ignores this flag. */
3673 if (*argrest) badarg = TRUE;
3676 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3677 logs to that file. We swallow the parameter and otherwise ignore it. */
3682 exim_fail("exim: string expected after -X\n");
3685 /* -z: a line of text to log */
3690 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3692 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3695 /* All other initial characters are errors */
3700 } /* End of high-level switch statement */
3702 /* Failed to recognize the option, or syntax error */
3705 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3706 "option %s\n", arg);
3710 /* If -R or -S have been specified without -q, assume a single queue run. */
3712 if ( (deliver_selectstring || deliver_selectstring_sender)
3713 && queue_interval < 0)
3718 store_pool = old_pool;
3721 /* If usage_wanted is set we call the usage function - which never returns */
3722 if (usage_wanted) exim_usage(called_as);
3724 /* Arguments have been processed. Check for incompatibilities. */
3725 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3726 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3727 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3728 || filter_test != FTEST_NONE
3729 || msg_action_arg > 0 && !one_msg_action
3731 || ( msg_action_arg > 0
3732 && ( f.daemon_listen || queue_interval > 0 || list_options
3733 || checking && msg_action != MSG_LOAD
3734 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3736 || ( (f.daemon_listen || queue_interval > 0)
3737 && ( sender_address || list_options || list_queue || checking
3740 || f.daemon_listen && queue_interval == 0
3741 || f.inetd_wait_mode && queue_interval >= 0
3743 && ( checking || smtp_input || extract_recipients
3744 || filter_test != FTEST_NONE || bi_option
3746 || ( verify_address_mode
3747 && ( f.address_test_mode || smtp_input || extract_recipients
3748 || filter_test != FTEST_NONE || bi_option
3750 || ( f.address_test_mode
3751 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3755 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3757 || deliver_selectstring && queue_interval < 0
3758 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3760 exim_fail("exim: incompatible command-line options or arguments\n");
3762 /* If debugging is set up, set the file and the file descriptor to pass on to
3763 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3764 to run in the foreground. */
3766 if (debug_selector != 0)
3768 debug_file = stderr;
3769 debug_fd = fileno(debug_file);
3770 f.background_daemon = FALSE;
3771 testharness_pause_ms(100); /* lets caller finish */
3772 if (debug_selector != D_v) /* -v only doesn't show this */
3774 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3775 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3777 if (!version_printed)
3778 show_whats_supported(FALSE);
3782 /* When started with root privilege, ensure that the limits on the number of
3783 open files and the number of processes (where that is accessible) are
3784 sufficiently large, or are unset, in case Exim has been called from an
3785 environment where the limits are screwed down. Not all OS have the ability to
3786 change some of these limits. */
3790 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3796 #ifdef RLIMIT_NOFILE
3797 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3799 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3801 rlp.rlim_cur = rlp.rlim_max = 0;
3804 /* I originally chose 1000 as a nice big number that was unlikely to
3805 be exceeded. It turns out that some older OS have a fixed upper limit of
3808 if (rlp.rlim_cur < 1000)
3810 rlp.rlim_cur = rlp.rlim_max = 1000;
3811 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3813 rlp.rlim_cur = rlp.rlim_max = 256;
3814 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3815 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3822 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3824 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3826 rlp.rlim_cur = rlp.rlim_max = 0;
3829 # ifdef RLIM_INFINITY
3830 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3832 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3834 if (rlp.rlim_cur < 1000)
3836 rlp.rlim_cur = rlp.rlim_max = 1000;
3838 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3839 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3845 /* Exim is normally entered as root (but some special configurations are
3846 possible that don't do this). However, it always spins off sub-processes that
3847 set their uid and gid as required for local delivery. We don't want to pass on
3848 any extra groups that root may belong to, so we want to get rid of them all at
3851 We need to obey setgroups() at this stage, before possibly giving up root
3852 privilege for a changed configuration file, but later on we might need to
3853 check on the additional groups for the admin user privilege - can't do that
3854 till after reading the config, which might specify the exim gid. Therefore,
3855 save the group list here first. */
3857 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3858 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3860 /* There is a fundamental difference in some BSD systems in the matter of
3861 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3862 known not to be different. On the "different" systems there is a single group
3863 list, and the first entry in it is the current group. On all other versions of
3864 Unix there is a supplementary group list, which is in *addition* to the current
3865 group. Consequently, to get rid of all extraneous groups on a "standard" system
3866 you pass over 0 groups to setgroups(), while on a "different" system you pass
3867 over a single group - the current group, which is always the first group in the
3868 list. Calling setgroups() with zero groups on a "different" system results in
3869 an error return. The following code should cope with both types of system.
3871 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3872 the "setgroups() with zero groups" - and changes the egid.
3873 Thanks to that we had to stash the original_egid above, for use below
3874 in the call to exim_setugid().
3876 However, if this process isn't running as root, setgroups() can't be used
3877 since you have to be root to run it, even if throwing away groups.
3878 Except, sigh, for Hurd - where you can.
3879 Not being root here happens only in some unusual configurations. */
3882 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3883 && setgroups(0, NULL) != 0
3885 && setgroups(1, group_list) != 0)
3886 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3888 /* If the configuration file name has been altered by an argument on the
3889 command line (either a new file name or a macro definition) and the caller is
3890 not root, or if this is a filter testing run, remove any setuid privilege the
3891 program has and run as the underlying user.
3893 The exim user is locked out of this, which severely restricts the use of -C
3896 Otherwise, set the real ids to the effective values (should be root unless run
3897 from inetd, which it can either be root or the exim uid, if one is configured).
3899 There is a private mechanism for bypassing some of this, in order to make it
3900 possible to test lots of configurations automatically, without having either to
3901 recompile each time, or to patch in an actual configuration file name and other
3902 values (such as the path name). If running in the test harness, pretend that
3903 configuration file changes and macro definitions haven't happened. */
3906 (!f.trusted_config || /* Config changed, or */
3907 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3908 real_uid != root_uid && /* Not root, and */
3909 !f.running_in_test_harness /* Not fudged */
3911 expansion_test /* expansion testing */
3913 filter_test != FTEST_NONE) /* Filter testing */
3915 setgroups(group_count, group_list);
3916 exim_setugid(real_uid, real_gid, FALSE,
3917 US"-C, -D, -be or -bf forces real uid");
3918 removed_privilege = TRUE;
3920 /* In the normal case when Exim is called like this, stderr is available
3921 and should be used for any logging information because attempts to write
3922 to the log will usually fail. To arrange this, we unset really_exim. However,
3923 if no stderr is available there is no point - we might as well have a go
3924 at the log (if it fails, syslog will be written).
3926 Note that if the invoker is Exim, the logs remain available. Messing with
3927 this causes unlogged successful deliveries. */
3929 if (log_stderr && real_uid != exim_uid)
3930 f.really_exim = FALSE;
3933 /* Privilege is to be retained for the moment. It may be dropped later,
3934 depending on the job that this Exim process has been asked to do. For now, set
3935 the real uid to the effective so that subsequent re-execs of Exim are done by a
3939 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3941 /* If testing a filter, open the file(s) now, before wasting time doing other
3942 setups and reading the message. */
3944 if (filter_test & FTEST_SYSTEM)
3945 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3946 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3949 if (filter_test & FTEST_USER)
3950 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3951 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3954 /* Initialise lookup_list
3955 If debugging, already called above via version reporting.
3956 In either case, we initialise the list of available lookups while running
3957 as root. All dynamically modules are loaded from a directory which is
3958 hard-coded into the binary and is code which, if not a module, would be
3959 part of Exim already. Ability to modify the content of the directory
3960 is equivalent to the ability to modify a setuid binary!
3962 This needs to happen before we read the main configuration. */
3965 /*XXX this excrescence could move to the testsuite standard config setup file */
3967 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3970 /* Read the main runtime configuration data; this gives up if there
3971 is a failure. It leaves the configuration file open so that the subsequent
3972 configuration data for delivery can be read if needed.
3974 NOTE: immediately after opening the configuration file we change the working
3975 directory to "/"! Later we change to $spool_directory. We do it there, because
3976 during readconf_main() some expansion takes place already. */
3978 /* Store the initial cwd before we change directories. Can be NULL if the
3979 dir has already been unlinked. */
3980 initial_cwd = os_getcwd(NULL, 0);
3981 if (!initial_cwd && errno)
3982 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
3984 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
3985 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
3988 -be[m] expansion test -
3989 -b[fF] filter test new
3991 -bmalware malware_test_file new
3993 -brw rewrite test new
3995 -bv[s] address verify -
3997 -bP <option> (except -bP config, which sets list_config)
3999 If any of these options is set, we suppress warnings about configuration
4000 issues (currently about tls_advertise_hosts and keep_environment not being
4004 int old_pool = store_pool;
4005 #ifdef MEASURE_TIMING
4006 struct timeval t0, diff;
4007 (void)gettimeofday(&t0, NULL);
4010 store_pool = POOL_CONFIG;
4011 readconf_main(checking || list_options);
4012 store_pool = old_pool;
4014 #ifdef MEASURE_TIMING
4015 report_time_since(&t0, US"readconf_main (delta)");
4019 /* Now in directory "/" */
4021 if (cleanup_environment() == FALSE)
4022 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4025 /* If an action on specific messages is requested, or if a daemon or queue
4026 runner is being started, we need to know if Exim was called by an admin user.
4027 This is the case if the real user is root or exim, or if the real group is
4028 exim, or if one of the supplementary groups is exim or a group listed in
4029 admin_groups. We don't fail all message actions immediately if not admin_user,
4030 since some actions can be performed by non-admin users. Instead, set admin_user
4031 for later interrogation. */
4033 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4034 f.admin_user = TRUE;
4036 for (int i = 0; i < group_count && !f.admin_user; i++)
4037 if (group_list[i] == exim_gid)
4038 f.admin_user = TRUE;
4039 else if (admin_groups)
4040 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4041 if (admin_groups[j] == group_list[i])
4042 f.admin_user = TRUE;
4044 /* Another group of privileged users are the trusted users. These are root,
4045 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4046 are permitted to specify sender_addresses with -f on the command line, and
4047 other message parameters as well. */
4049 if (real_uid == root_uid || real_uid == exim_uid)
4050 f.trusted_caller = TRUE;
4054 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4055 if (trusted_users[i] == real_uid)
4056 f.trusted_caller = TRUE;
4059 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4060 if (trusted_groups[i] == real_gid)
4061 f.trusted_caller = TRUE;
4062 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4063 if (trusted_groups[i] == group_list[j])
4064 f.trusted_caller = TRUE;
4067 /* At this point, we know if the user is privileged and some command-line
4068 options become possibly impermissible, depending upon the configuration file. */
4070 if (checking && commandline_checks_require_admin && !f.admin_user)
4071 exim_fail("exim: those command-line flags are set to require admin\n");
4073 /* Handle the decoding of logging options. */
4075 decode_bits(log_selector, log_selector_size, log_notall,
4076 log_selector_string, log_options, log_options_count, US"log", 0);
4080 debug_printf("configuration file is %s\n", config_main_filename);
4081 debug_printf("log selectors =");
4082 for (int i = 0; i < log_selector_size; i++)
4083 debug_printf(" %08x", log_selector[i]);
4087 /* If domain literals are not allowed, check the sender address that was
4088 supplied with -f. Ditto for a stripped trailing dot. */
4092 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4093 exim_fail("exim: bad -f address \"%s\": domain literals not "
4094 "allowed\n", sender_address);
4095 if (f_end_dot && !strip_trailing_dot)
4096 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4097 "(trailing dot not allowed)\n", sender_address);
4100 /* See if an admin user overrode our logging. */
4102 if (cmdline_syslog_name)
4105 syslog_processname = cmdline_syslog_name;
4106 log_file_path = string_copy(CUS"syslog");
4109 /* not a panic, non-privileged users should not be able to spam paniclog */
4111 "exim: you lack sufficient privilege to specify syslog process name\n");
4113 /* Paranoia check of maximum lengths of certain strings. There is a check
4114 on the length of the log file path in log.c, which will come into effect
4115 if there are any calls to write the log earlier than this. However, if we
4116 get this far but the string is very long, it is better to stop now than to
4117 carry on and (e.g.) receive a message and then have to collapse. The call to
4118 log_write() from here will cause the ultimate panic collapse if the complete
4119 file name exceeds the buffer length. */
4121 if (Ustrlen(log_file_path) > 200)
4122 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4123 "log_file_path is longer than 200 chars: aborting");
4125 if (Ustrlen(pid_file_path) > 200)
4126 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4127 "pid_file_path is longer than 200 chars: aborting");
4129 if (Ustrlen(spool_directory) > 200)
4130 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4131 "spool_directory is longer than 200 chars: aborting");
4133 /* Length check on the process name given to syslog for its TAG field,
4134 which is only permitted to be 32 characters or less. See RFC 3164. */
4136 if (Ustrlen(syslog_processname) > 32)
4137 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4138 "syslog_processname is longer than 32 chars: aborting");
4143 log_write(0, LOG_MAIN, "%s", log_oneline);
4144 return EXIT_SUCCESS;
4147 return EXIT_FAILURE;
4149 /* In some operating systems, the environment variable TMPDIR controls where
4150 temporary files are created; Exim doesn't use these (apart from when delivering
4151 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4152 If TMPDIR is found in the environment, reset it to the value defined in the
4153 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4154 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4155 EXIM_TMPDIR by the build scripts.
4159 if (environ) for (uschar ** p = USS environ; *p; p++)
4160 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4162 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4163 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4165 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4169 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4170 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4171 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4172 called by a user who has set the TZ variable. This then affects the timestamps
4173 in log files and in Received: headers, and any created Date: header lines. The
4174 required timezone is settable in the configuration file, so nothing can be done
4175 about this earlier - but hopefully nothing will normally be logged earlier than
4176 this. We have to make a new environment if TZ is wrong, but don't bother if
4177 timestamps_utc is set, because then all times are in UTC anyway. */
4179 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4180 f.timestamps_utc = TRUE;
4183 uschar *envtz = US getenv("TZ");
4185 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4186 : timezone_string != NULL
4189 uschar **p = USS environ;
4193 if (environ) while (*p++) count++;
4194 if (!envtz) count++;
4195 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4196 if (environ) for (p = USS environ; *p; p++)
4197 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4198 if (timezone_string)
4200 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4201 sprintf(CS *newp++, "TZ=%s", timezone_string);
4206 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4207 tod_stamp(tod_log));
4211 /* Handle the case when we have removed the setuid privilege because of -C or
4212 -D. This means that the caller of Exim was not root.
4214 There is a problem if we were running as the Exim user. The sysadmin may
4215 expect this case to retain privilege because "the binary was called by the
4216 Exim user", but it hasn't, because either the -D option set macros, or the
4217 -C option set a non-trusted configuration file. There are two possibilities:
4219 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4220 to do message deliveries. Thus, the fact that it is running as a
4221 non-privileged user is plausible, and might be wanted in some special
4222 configurations. However, really_exim will have been set false when
4223 privilege was dropped, to stop Exim trying to write to its normal log
4224 files. Therefore, re-enable normal log processing, assuming the sysadmin
4225 has set up the log directory correctly.
4227 (2) If deliver_drop_privilege is not set, the configuration won't work as
4228 apparently intended, and so we log a panic message. In order to retain
4229 root for -C or -D, the caller must either be root or be invoking a
4230 trusted configuration file (when deliver_drop_privilege is false). */
4232 if ( removed_privilege
4233 && (!f.trusted_config || opt_D_used)
4234 && real_uid == exim_uid)
4235 if (deliver_drop_privilege)
4236 f.really_exim = TRUE; /* let logging work normally */
4238 log_write(0, LOG_MAIN|LOG_PANIC,
4239 "exim user lost privilege for using %s option",
4240 f.trusted_config? "-D" : "-C");
4242 /* Start up Perl interpreter if Perl support is configured and there is a
4243 perl_startup option, and the configuration or the command line specifies
4244 initializing starting. Note that the global variables are actually called
4245 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4248 if (perl_start_option != 0)
4249 opt_perl_at_start = (perl_start_option > 0);
4250 if (opt_perl_at_start && opt_perl_startup != NULL)
4253 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4254 if ((errstr = init_perl(opt_perl_startup)))
4255 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4256 opt_perl_started = TRUE;
4258 #endif /* EXIM_PERL */
4260 /* Log the arguments of the call if the configuration file said so. This is
4261 a debugging feature for finding out what arguments certain MUAs actually use.
4262 Don't attempt it if logging is disabled, or if listing variables or if
4263 verifying/testing addresses or expansions. */
4265 if ( (debug_selector & D_any || LOGGING(arguments))
4266 && f.really_exim && !list_options && !checking)
4268 uschar *p = big_buffer;
4269 Ustrcpy(p, US"cwd= (failed)");
4276 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4277 p += Ustrlen(CCS p);
4280 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4282 for (int i = 0; i < argc; i++)
4284 int len = Ustrlen(argv[i]);
4285 const uschar *printing;
4287 if (p + len + 8 >= big_buffer + big_buffer_size)
4289 Ustrcpy(p, US" ...");
4290 log_write(0, LOG_MAIN, "%s", big_buffer);
4291 Ustrcpy(big_buffer, US"...");
4294 printing = string_printing(argv[i]);
4295 if (!*printing) quote = US"\"";
4298 const uschar *pp = printing;
4300 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4302 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4303 (p - big_buffer) - 4), printing, quote);
4306 if (LOGGING(arguments))
4307 log_write(0, LOG_MAIN, "%s", big_buffer);
4309 debug_printf("%s\n", big_buffer);
4312 /* Set the working directory to be the top-level spool directory. We don't rely
4313 on this in the code, which always uses fully qualified names, but it's useful
4314 for core dumps etc. Don't complain if it fails - the spool directory might not
4315 be generally accessible and calls with the -C option (and others) have lost
4316 privilege by now. Before the chdir, we try to ensure that the directory exists.
4319 if (Uchdir(spool_directory) != 0)
4321 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4322 (void) Uchdir(spool_directory);
4325 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4326 alias file. Exim doesn't have such a concept, but this call is screwed into
4327 Sun's YP makefiles. Handle this by calling a configured script, as the real
4328 user who called Exim. The -oA option can be used to pass an argument to the
4333 (void) fclose(config_file);
4334 if (bi_command && *bi_command)
4338 argv[i++] = bi_command;
4339 if (alias_arg) argv[i++] = alias_arg;
4342 setgroups(group_count, group_list);
4343 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4345 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4346 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4348 execv(CS argv[0], (char *const *)argv);
4349 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4353 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4358 /* We moved the admin/trusted check to be immediately after reading the
4359 configuration file. We leave these prints here to ensure that syslog setup,
4360 logfile setup, and so on has already happened. */
4362 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4363 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4365 /* Only an admin user may start the daemon or force a queue run in the default
4366 configuration, but the queue run restriction can be relaxed. Only an admin
4367 user may request that a message be returned to its sender forthwith. Only an
4368 admin user may specify a debug level greater than D_v (because it might show
4369 passwords, etc. in lookup queries). Only an admin user may request a queue
4370 count. Only an admin user can use the test interface to scan for email
4371 (because Exim will be in the spool dir and able to look at mails). */
4375 BOOL debugset = (debug_selector & ~D_v) != 0;
4376 if ( deliver_give_up || f.daemon_listen || malware_test_file
4377 || count_queue && queue_list_requires_admin
4378 || list_queue && queue_list_requires_admin
4379 || queue_interval >= 0 && prod_requires_admin
4380 || queue_name_dest && prod_requires_admin
4381 || debugset && !f.running_in_test_harness
4383 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4386 /* If the real user is not root or the exim uid, the argument for passing
4387 in an open TCP/IP connection for another message is not permitted, nor is
4388 running with the -N option for any delivery action, unless this call to exim is
4389 one that supplied an input message, or we are using a patched exim for
4390 regression testing. */
4392 if ( real_uid != root_uid && real_uid != exim_uid
4393 && ( continue_hostname
4395 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4397 && !f.running_in_test_harness
4399 exim_fail("exim: Permission denied\n");
4401 /* If the caller is not trusted, certain arguments are ignored when running for
4402 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4403 Note that authority for performing certain actions on messages is tested in the
4404 queue_action() function. */
4406 if (!f.trusted_caller && !checking)
4408 sender_host_name = sender_host_address = interface_address =
4409 sender_ident = received_protocol = NULL;
4410 sender_host_port = interface_port = 0;
4411 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4414 /* If a sender host address is set, extract the optional port number off the
4415 end of it and check its syntax. Do the same thing for the interface address.
4416 Exim exits if the syntax is bad. */
4420 if (sender_host_address)
4421 sender_host_port = check_port(sender_host_address);
4422 if (interface_address)
4423 interface_port = check_port(interface_address);
4426 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4429 if (f.trusted_caller)
4431 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4432 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4435 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4438 /* If an SMTP message is being received check to see if the standard input is a
4439 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4440 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4445 union sockaddr_46 inetd_sock;
4446 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4447 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4449 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4450 if (family == AF_INET || family == AF_INET6)
4452 union sockaddr_46 interface_sock;
4453 size = sizeof(interface_sock);
4455 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4456 interface_address = host_ntoa(-1, &interface_sock, NULL,
4459 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4461 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4464 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4465 NULL, &sender_host_port);
4466 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4467 "inetd is not supported when mua_wrapper is set");
4471 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4476 /* If the load average is going to be needed while receiving a message, get it
4477 now for those OS that require the first call to os_getloadavg() to be done as
4478 root. There will be further calls later for each message received. */
4480 #ifdef LOAD_AVG_NEEDS_ROOT
4481 if ( receiving_message
4482 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4483 load_average = OS_GETLOADAVG();
4486 /* The queue_only configuration option can be overridden by -odx on the command
4487 line, except that if queue_only_override is false, queue_only cannot be unset
4488 from the command line. */
4490 if (queue_only_set && (queue_only_override || arg_queue_only))
4491 queue_only = arg_queue_only;
4493 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4496 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4497 if (arg_smtp_receive_timeout >= 0)
4498 smtp_receive_timeout = arg_smtp_receive_timeout;
4500 /* If Exim was started with root privilege, unless we have already removed the
4501 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4502 except when starting the daemon or doing some kind of delivery or address
4503 testing (-bt). These are the only cases when root need to be retained. We run
4504 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4505 retained only for starting the daemon. We always do the initgroups() in this
4506 situation (controlled by the TRUE below), in order to be as close as possible
4507 to the state Exim usually runs in. */
4509 if ( !unprivileged /* originally had root AND */
4510 && !removed_privilege /* still got root AND */
4511 && !f.daemon_listen /* not starting the daemon */
4512 && queue_interval <= 0 /* (either kind of daemon) */
4513 && ( /* AND EITHER */
4514 deliver_drop_privilege /* requested unprivileged */
4516 queue_interval < 0 /* not running the queue */
4517 && ( msg_action_arg < 0 /* and */
4518 || msg_action != MSG_DELIVER /* not delivering */
4520 && (!checking || !f.address_test_mode) /* not address checking */
4521 && !rcpt_verify_quota /* and not quota checking */
4523 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4525 /* When we are retaining a privileged uid, we still change to the exim gid. */
4530 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4531 rv = setgid(exim_gid);
4532 /* Impact of failure is that some stuff might end up with an incorrect group.
4533 We track this for failures from root, since any attempt to change privilege
4534 by root should succeed and failures should be examined. For non-root,
4535 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4536 no need to complain then. */
4538 if (!(unprivileged || removed_privilege))
4539 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4542 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4543 (long int)exim_gid, strerror(errno));
4547 /* Handle a request to scan a file for malware */
4548 if (malware_test_file)
4550 #ifdef WITH_CONTENT_SCAN
4552 set_process_info("scanning file for malware");
4553 if ((result = malware_in_file(malware_test_file)) == FAIL)
4555 printf("No malware found.\n");
4560 printf("Malware lookup returned non-okay/fail: %d\n", result);
4564 printf("Malware found: %s\n", malware_name);
4566 printf("Malware scan detected malware of unknown name.\n");
4568 printf("Malware scanning not enabled at compile time.\n");
4573 /* Handle a request to list the delivery queue */
4577 set_process_info("listing the queue");
4578 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4582 /* Handle a request to count the delivery queue */
4586 set_process_info("counting the queue");
4587 fprintf(stdout, "%u\n", queue_count());
4591 /* Handle actions on specific messages, except for the force delivery and
4592 message load actions, which are done below. Some actions take a whole list of
4593 message ids, which are known to continue up to the end of the arguments. Others
4594 take a single message id and then operate on the recipients list. */
4596 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4598 int yield = EXIT_SUCCESS;
4599 set_process_info("acting on specified messages");
4601 /* ACL definitions may be needed when removing a message (-Mrm) because
4602 event_action gets expanded */
4604 if (msg_action == MSG_REMOVE)
4606 int old_pool = store_pool;
4607 store_pool = POOL_CONFIG;
4609 store_pool = old_pool;
4610 store_writeprotect(POOL_CONFIG);
4613 if (!one_msg_action)
4615 for (i = msg_action_arg; i < argc; i++)
4616 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4617 yield = EXIT_FAILURE;
4620 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4621 default: printf("\n"); break;
4625 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4626 recipients_arg)) yield = EXIT_FAILURE;
4630 /* We used to set up here to skip reading the ACL section, on
4631 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4632 Now, since the intro of the ${acl } expansion, ACL definitions may be
4633 needed in transports so we lost the optimisation. */
4636 int old_pool = store_pool;
4637 #ifdef MEASURE_TIMING
4638 struct timeval t0, diff;
4639 (void)gettimeofday(&t0, NULL);
4642 store_pool = POOL_CONFIG;
4644 store_pool = old_pool;
4646 /* -be can add macro definitions, needing to link to the macro structure
4647 chain. Otherwise, make the memory used for config data readonly. */
4649 if (!expansion_test)
4650 store_writeprotect(POOL_CONFIG);
4652 #ifdef MEASURE_TIMING
4653 report_time_since(&t0, US"readconf_rest (delta)");
4657 /* Handle a request to check quota */
4658 if (rcpt_verify_quota)
4659 if (real_uid != root_uid && real_uid != exim_uid)
4660 exim_fail("exim: Permission denied\n");
4661 else if (recipients_arg >= argc)
4662 exim_fail("exim: missing recipient for quota check\n");
4665 verify_quota(argv[recipients_arg]);
4666 exim_exit(EXIT_SUCCESS);
4669 /* Handle the -brt option. This is for checking out retry configurations.
4670 The next three arguments are a domain name or a complete address, and
4671 optionally two error numbers. All it does is to call the function that
4672 scans the retry configuration data. */
4674 if (test_retry_arg >= 0)
4676 retry_config *yield;
4677 int basic_errno = 0;
4679 const uschar *s1, *s2;
4681 if (test_retry_arg >= argc)
4683 printf("-brt needs a domain or address argument\n");
4684 exim_exit(EXIT_FAILURE);
4686 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4689 /* If the first argument contains no @ and no . it might be a local user
4690 or it might be a single-component name. Treat as a domain. */
4692 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4694 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4695 "being \ntreated as a one-component domain, not as a local part.\n\n",
4699 /* There may be an optional second domain arg. */
4701 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4702 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4704 /* The final arg is an error name */
4706 if (test_retry_arg < argc)
4708 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4710 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4713 printf("%s\n", CS error);
4714 return EXIT_FAILURE;
4717 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4718 code > 100 as an error is for matching codes to the decade. Turn them into
4719 a real error code, off the decade. */
4721 if (basic_errno == ERRNO_MAIL4XX ||
4722 basic_errno == ERRNO_RCPT4XX ||
4723 basic_errno == ERRNO_DATA4XX)
4725 int code = (more_errno >> 8) & 255;
4727 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4728 else if (code > 100)
4729 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4733 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4734 printf("No retry information found\n");
4737 more_errno = yield->more_errno;
4738 printf("Retry rule: %s ", yield->pattern);
4740 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4742 printf("quota%s%s ",
4743 (more_errno > 0)? "_" : "",
4744 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4746 else if (yield->basic_errno == ECONNREFUSED)
4748 printf("refused%s%s ",
4749 (more_errno > 0)? "_" : "",
4750 (more_errno == 'M')? "MX" :
4751 (more_errno == 'A')? "A" : "");
4753 else if (yield->basic_errno == ETIMEDOUT)
4756 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4758 if (more_errno != 0) printf("_%s",
4759 (more_errno == 'M')? "MX" : "A");
4762 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4763 printf("auth_failed ");
4766 for (retry_rule * r = yield->rules; r; r = r->next)
4768 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4769 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4775 printf(",%d.", x/1000);
4789 exim_exit(EXIT_SUCCESS);
4792 /* Handle a request to list one or more configuration options */
4793 /* If -n was set, we suppress some information */
4798 set_process_info("listing variables");
4799 if (recipients_arg >= argc)
4800 fail = !readconf_print(US"all", NULL, flag_n);
4801 else for (i = recipients_arg; i < argc; i++)
4804 (Ustrcmp(argv[i], "router") == 0 ||
4805 Ustrcmp(argv[i], "transport") == 0 ||
4806 Ustrcmp(argv[i], "authenticator") == 0 ||
4807 Ustrcmp(argv[i], "macro") == 0 ||
4808 Ustrcmp(argv[i], "environment") == 0))
4810 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4814 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4816 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4821 set_process_info("listing config");
4822 exim_exit(readconf_print(US"config", NULL, flag_n)
4823 ? EXIT_SUCCESS : EXIT_FAILURE);
4827 /* Initialise subsystems as required. */
4831 /* Handle a request to deliver one or more messages that are already on the
4832 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4833 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4835 Delivery of specific messages is typically used for a small number when
4836 prodding by hand (when the option forced_delivery will be set) or when
4837 re-execing to regain root privilege. Each message delivery must happen in a
4838 separate process, so we fork a process for each one, and run them sequentially
4839 so that debugging output doesn't get intertwined, and to avoid spawning too
4840 many processes if a long list is given. However, don't fork for the last one;
4841 this saves a process in the common case when Exim is called to deliver just one
4844 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4846 if (prod_requires_admin && !f.admin_user)
4848 fprintf(stderr, "exim: Permission denied\n");
4849 exim_exit(EXIT_FAILURE);
4851 set_process_info("delivering specified messages");
4852 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4853 for (i = msg_action_arg; i < argc; i++)
4857 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4858 that runs into a later copy into the untainted global message_id[] */
4859 /*XXX Do we need a length limit check here? */
4861 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4862 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4864 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4865 exim_underbar_exit(EXIT_SUCCESS);
4869 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4871 exim_exit(EXIT_FAILURE);
4875 exim_exit(EXIT_SUCCESS);
4879 /* If only a single queue run is requested, without SMTP listening, we can just
4880 turn into a queue runner, with an optional starting message id. */
4882 if (queue_interval == 0 && !f.daemon_listen)
4884 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4885 start_queue_run_id ? US" starting at " : US"",
4886 start_queue_run_id ? start_queue_run_id: US"",
4887 stop_queue_run_id ? US" stopping at " : US"",
4888 stop_queue_run_id ? stop_queue_run_id : US"");
4890 set_process_info("running the '%s' queue (single queue run)", queue_name);
4892 set_process_info("running the queue (single queue run)");
4893 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4894 exim_exit(EXIT_SUCCESS);
4898 /* Find the login name of the real user running this process. This is always
4899 needed when receiving a message, because it is written into the spool file. It
4900 may also be used to construct a from: or a sender: header, and in this case we
4901 need the user's full name as well, so save a copy of it, checked for RFC822
4902 syntax and munged if necessary, if it hasn't previously been set by the -F
4903 argument. We may try to get the passwd entry more than once, in case NIS or
4904 other delays are in evidence. Save the home directory for use in filter testing
4909 if ((pw = getpwuid(real_uid)) != NULL)
4911 originator_login = string_copy(US pw->pw_name);
4912 originator_home = string_copy(US pw->pw_dir);
4914 /* If user name has not been set by -F, set it from the passwd entry
4915 unless -f has been used to set the sender address by a trusted user. */
4917 if (!originator_name)
4919 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4921 uschar *name = US pw->pw_gecos;
4922 uschar *amp = Ustrchr(name, '&');
4925 /* Most Unix specify that a '&' character in the gecos field is
4926 replaced by a copy of the login name, and some even specify that
4927 the first character should be upper cased, so that's what we do. */
4932 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4933 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4934 buffer[loffset] = toupper(buffer[loffset]);
4938 /* If a pattern for matching the gecos field was supplied, apply
4939 it and then expand the name string. */
4941 if (gecos_pattern && gecos_name)
4943 const pcre2_code *re;
4944 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4946 if (regex_match_and_setup(re, name, 0, -1))
4948 uschar *new_name = expand_string(gecos_name);
4952 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4953 "gecos field \"%s\"\n", new_name, name);
4956 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4957 "\"%s\": %s\n", gecos_name, expand_string_message);
4959 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4960 "gecos field \"%s\"\n", gecos_pattern, name);
4961 store_free((void *)re);
4963 originator_name = string_copy(name);
4966 /* A trusted caller has used -f but not -F */
4968 else originator_name = US"";
4971 /* Break the retry loop */
4976 if (++i > finduser_retries) break;
4980 /* If we cannot get a user login, log the incident and give up, unless the
4981 configuration specifies something to use. When running in the test harness,
4982 any setting of unknown_login overrides the actual name. */
4984 if (!originator_login || f.running_in_test_harness)
4988 originator_login = expand_string(unknown_login);
4989 if (!originator_name && unknown_username)
4990 originator_name = expand_string(unknown_username);
4991 if (!originator_name) originator_name = US"";
4993 if (!originator_login)
4994 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4998 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5001 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5003 /* If a message is created by this call of Exim, the uid/gid of its originator
5004 are those of the caller. These values are overridden if an existing message is
5005 read in from the spool. */
5007 originator_uid = real_uid;
5008 originator_gid = real_gid;
5010 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5011 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5013 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5014 returns. We leave this till here so that the originator_ fields are available
5015 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5018 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5022 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5023 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5024 "mua_wrapper is set");
5027 # ifndef DISABLE_TLS
5028 /* This also checks that the library linkage is working and we can call
5029 routines in it, so call even if tls_require_ciphers is unset */
5031 # ifdef MEASURE_TIMING
5032 struct timeval t0, diff;
5033 (void)gettimeofday(&t0, NULL);
5035 if (!tls_dropprivs_validate_require_cipher(FALSE))
5037 # ifdef MEASURE_TIMING
5038 report_time_since(&t0, US"validate_ciphers (delta)");
5046 /* If the sender ident has not been set (by a trusted caller) set it to
5047 the caller. This will get overwritten below for an inetd call. If a trusted
5048 caller has set it empty, unset it. */
5050 if (!sender_ident) sender_ident = originator_login;
5051 else if (!*sender_ident) sender_ident = NULL;
5053 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5054 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5055 originator_* variables set. */
5057 if (test_rewrite_arg >= 0)
5059 f.really_exim = FALSE;
5060 if (test_rewrite_arg >= argc)
5062 printf("-brw needs an address argument\n");
5063 exim_exit(EXIT_FAILURE);
5065 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5066 exim_exit(EXIT_SUCCESS);
5069 /* A locally-supplied message is considered to be coming from a local user
5070 unless a trusted caller supplies a sender address with -f, or is passing in the
5071 message via SMTP (inetd invocation or otherwise). */
5073 if ( !sender_address && !smtp_input
5074 || !f.trusted_caller && filter_test == FTEST_NONE)
5076 f.sender_local = TRUE;
5078 /* A trusted caller can supply authenticated_sender and authenticated_id
5079 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5080 defaults except when host checking. */
5082 if (!authenticated_sender && !host_checking)
5083 authenticated_sender = string_sprintf("%s@%s", originator_login,
5084 qualify_domain_sender);
5085 if (!authenticated_id && !host_checking)
5086 authenticated_id = originator_login;
5089 /* Trusted callers are always permitted to specify the sender address.
5090 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5091 is specified is the empty address. However, if a trusted caller does not
5092 specify a sender address for SMTP input, we leave sender_address unset. This
5093 causes the MAIL commands to be honoured. */
5095 if ( !smtp_input && !sender_address
5096 || !receive_check_set_sender(sender_address))
5098 /* Either the caller is not permitted to set a general sender, or this is
5099 non-SMTP input and the trusted caller has not set a sender. If there is no
5100 sender, or if a sender other than <> is set, override with the originator's
5101 login (which will get qualified below), except when checking things. */
5103 if ( !sender_address /* No sender_address set */
5105 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5106 !checking)) /* Not running tests, including filter tests */
5108 sender_address = originator_login;
5109 f.sender_address_forced = FALSE;
5110 sender_address_domain = 0;
5114 /* Remember whether an untrusted caller set the sender address */
5116 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5118 /* Ensure that the sender address is fully qualified unless it is the empty
5119 address, which indicates an error message, or doesn't exist (root caller, smtp
5120 interface, no -f argument). */
5122 if (sender_address && *sender_address && sender_address_domain == 0)
5123 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5124 qualify_domain_sender);
5126 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5128 /* Handle a request to verify a list of addresses, or test them for delivery.
5129 This must follow the setting of the sender address, since routers can be
5130 predicated upon the sender. If no arguments are given, read addresses from
5131 stdin. Set debug_level to at least D_v to get full output for address testing.
5134 if (verify_address_mode || f.address_test_mode)
5137 int flags = vopt_qualify;
5139 if (verify_address_mode)
5141 if (!verify_as_sender) flags |= vopt_is_recipient;
5142 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5147 flags |= vopt_is_recipient;
5148 debug_selector |= D_v;
5149 debug_file = stderr;
5150 debug_fd = fileno(debug_file);
5151 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5154 if (recipients_arg < argc)
5155 while (recipients_arg < argc)
5157 /* Supplied addresses are tainted since they come from a user */
5158 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5161 BOOL finished = FALSE;
5162 uschar *ss = parse_find_address_end(s, FALSE);
5163 if (*ss == ',') *ss = 0; else finished = TRUE;
5164 test_address(s, flags, &exit_value);
5167 while (*++s == ',' || isspace(*s)) ;
5173 uschar * s = get_stdinput(NULL, NULL);
5175 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5179 exim_exit(exit_value);
5182 /* Handle expansion checking. Either expand items on the command line, or read
5183 from stdin if there aren't any. If -Mset was specified, load the message so
5184 that its variables can be used, but restrict this facility to admin users.
5185 Otherwise, if -bem was used, read a message from stdin. */
5189 dns_init(FALSE, FALSE, FALSE);
5190 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5194 exim_fail("exim: permission denied\n");
5195 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5196 /* Checking the length of the ID is sufficient to validate it.
5197 Get an untainted version so file opens can be done. */
5198 message_id = string_copy_taint(message_id, FALSE);
5200 spoolname = string_sprintf("%s-H", message_id);
5201 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5202 printf ("Failed to load message datafile %s\n", message_id);
5203 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5204 printf ("Failed to load message %s\n", message_id);
5207 /* Read a test message from a file. We fudge it up to be on stdin, saving
5208 stdin itself for later reading of expansion strings. */
5210 else if (expansion_test_message)
5212 int save_stdin = dup(0);
5213 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5215 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5218 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5219 message_ended = END_NOTENDED;
5220 read_message_body(receive_msg(extract_recipients));
5221 message_linecount += body_linecount;
5222 (void)dup2(save_stdin, 0);
5223 (void)close(save_stdin);
5224 clearerr(stdin); /* Required by Darwin */
5227 /* Only admin users may see config-file macros this way */
5229 if (!f.admin_user) macros_user = macros = mlast = NULL;
5231 /* Allow $recipients for this testing */
5233 f.enable_dollar_recipients = TRUE;
5235 /* Expand command line items */
5237 if (recipients_arg < argc)
5238 while (recipients_arg < argc)
5239 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5245 char *(*fn_readline)(const char *) = NULL;
5246 void (*fn_addhist)(const char *) = NULL;
5250 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5253 while (s = get_stdinput(fn_readline, fn_addhist))
5254 expansion_test_line(s);
5257 if (dlhandle) dlclose(dlhandle);
5261 /* The data file will be open after -Mset */
5263 if (deliver_datafile >= 0)
5265 (void)close(deliver_datafile);
5266 deliver_datafile = -1;
5269 exim_exit(EXIT_SUCCESS);
5273 /* The active host name is normally the primary host name, but it can be varied
5274 for hosts that want to play several parts at once. We need to ensure that it is
5275 set for host checking, and for receiving messages. */
5277 smtp_active_hostname = primary_hostname;
5278 if (raw_active_hostname != NULL)
5280 uschar *nah = expand_string(raw_active_hostname);
5283 if (!f.expand_string_forcedfail)
5284 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5285 "(smtp_active_hostname): %s", raw_active_hostname,
5286 expand_string_message);
5288 else if (nah[0] != 0) smtp_active_hostname = nah;
5291 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5292 given IP address so that the blocking and relay configuration can be tested.
5293 Unless a sender_ident was set by -oMt, we discard it (the default is the
5294 caller's login name). An RFC 1413 call is made only if we are running in the
5295 test harness and an incoming interface and both ports are specified, because
5296 there is no TCP/IP call to find the ident for. */
5303 if (!sender_ident_set)
5305 sender_ident = NULL;
5306 if (f.running_in_test_harness && sender_host_port
5307 && interface_address && interface_port)
5308 verify_get_ident(1223); /* note hardwired port number */
5311 /* In case the given address is a non-canonical IPv6 address, canonicalize
5312 it. The code works for both IPv4 and IPv6, as it happens. */
5314 size = host_aton(sender_host_address, x);
5315 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5316 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5318 /* Now set up for testing */
5320 host_build_sender_fullhost();
5324 f.sender_local = FALSE;
5325 f.sender_host_notsocket = TRUE;
5326 debug_file = stderr;
5327 debug_fd = fileno(debug_file);
5328 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5329 "**** but without any ident (RFC 1413) callback.\n"
5330 "**** This is not for real!\n\n",
5331 sender_host_address);
5333 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5334 if (verify_check_host(&hosts_connection_nolog) == OK)
5335 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5336 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5338 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5339 because a log line has already been written for all its failure exists
5340 (usually "connection refused: <reason>") and writing another one is
5341 unnecessary clutter. */
5343 if (smtp_start_session())
5346 for (; (reset_point = store_mark()); store_reset(reset_point))
5348 if (smtp_setup_msg() <= 0) break;
5349 if (!receive_msg(FALSE)) break;
5351 return_path = sender_address = NULL;
5352 dnslist_domain = dnslist_matched = NULL;
5353 #ifndef DISABLE_DKIM
5354 dkim_cur_signer = NULL;
5357 deliver_localpart_orig = NULL;
5358 deliver_domain_orig = NULL;
5359 callout_address = sending_ip_address = NULL;
5360 deliver_localpart_data = deliver_domain_data =
5361 recipient_data = sender_data = NULL;
5362 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5366 exim_exit(EXIT_SUCCESS);
5370 /* Arrange for message reception if recipients or SMTP were specified;
5371 otherwise complain unless a version print (-bV) happened or this is a filter
5372 verification test or info dump.
5373 In the former case, show the configuration file name. */
5375 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5377 if (version_printed)
5379 if (Ustrchr(config_main_filelist, ':'))
5380 printf("Configuration file search path is %s\n", config_main_filelist);
5381 printf("Configuration file is %s\n", config_main_filename);
5382 return EXIT_SUCCESS;
5385 if (info_flag != CMDINFO_NONE)
5387 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5388 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5391 if (filter_test == FTEST_NONE)
5392 exim_usage(called_as);
5396 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5397 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5398 that we are not called from inetd, because that is rejected above. The
5399 following configuration settings are forced here:
5401 (1) Synchronous delivery (-odi)
5402 (2) Errors to stderr (-oep == -oeq)
5403 (3) No parallel remote delivery
5404 (4) Unprivileged delivery
5406 We don't force overall queueing options because there are several of them;
5407 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5408 to override any SMTP queueing. */
5412 f.synchronous_delivery = TRUE;
5413 arg_error_handling = ERRORS_STDERR;
5414 remote_max_parallel = 1;
5415 deliver_drop_privilege = TRUE;
5416 f.queue_smtp = FALSE;
5417 queue_smtp_domains = NULL;
5419 message_utf8_downconvert = -1; /* convert-if-needed */
5424 /* Prepare to accept one or more new messages on the standard input. When a
5425 message has been read, its id is returned in message_id[]. If doing immediate
5426 delivery, we fork a delivery process for each received message, except for the
5427 last one, where we can save a process switch.
5429 It is only in non-smtp mode that error_handling is allowed to be changed from
5430 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5431 sendmail error modes other than -oem ever actually used? Later: yes.) */
5433 if (!smtp_input) error_handling = arg_error_handling;
5435 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5436 logging being sent down the socket and make an identd call to get the
5439 else if (f.is_inetd)
5441 (void)fclose(stderr);
5442 exim_nullstd(); /* Re-open to /dev/null */
5443 verify_get_ident(IDENT_PORT);
5444 host_build_sender_fullhost();
5445 set_process_info("handling incoming connection from %s via inetd",
5449 /* If the sender host address has been set, build sender_fullhost if it hasn't
5450 already been done (which it will have been for inetd). This caters for the
5451 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5452 so that the test for IP options is skipped for -bs input. */
5454 if (sender_host_address && !sender_fullhost)
5456 host_build_sender_fullhost();
5457 set_process_info("handling incoming connection from %s via -oMa",
5459 f.sender_host_notsocket = TRUE;
5462 /* Otherwise, set the sender host as unknown except for inetd calls. This
5463 prevents host checking in the case of -bs not from inetd and also for -bS. */
5465 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5467 /* If stdout does not exist, then dup stdin to stdout. This can happen
5468 if exim is started from inetd. In this case fd 0 will be set to the socket,
5469 but fd 1 will not be set. This also happens for passed SMTP channels. */
5471 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5473 /* Set up the incoming protocol name and the state of the program. Root is
5474 allowed to force received protocol via the -oMr option above. If we have come
5475 via inetd, the process info has already been set up. We don't set
5476 received_protocol here for smtp input, as it varies according to
5477 batch/HELO/EHLO/AUTH/TLS. */
5481 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5482 smtp_batched_input? "batched " : "",
5483 sender_address ? sender_address : originator_login);
5487 int old_pool = store_pool;
5488 store_pool = POOL_PERM;
5489 if (!received_protocol)
5490 received_protocol = string_sprintf("local%s", called_as);
5491 store_pool = old_pool;
5492 set_process_info("accepting a local non-SMTP message from <%s>",
5496 /* Initialize the session_local_queue-only flag (this will be ignored if
5497 mua_wrapper is set) */
5500 session_local_queue_only = queue_only;
5502 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5503 the spool if so configured. On failure, we must not attempt to send an error
5504 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5505 error code is given.) */
5507 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5508 exim_fail("exim: insufficient disk space\n");
5510 /* If this is smtp input of any kind, real or batched, handle the start of the
5513 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5514 because a log line has already been written for all its failure exists
5515 (usually "connection refused: <reason>") and writing another one is
5516 unnecessary clutter. */
5522 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5523 if (verify_check_host(&hosts_connection_nolog) == OK)
5524 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5525 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5526 if (!smtp_start_session())
5529 exim_exit(EXIT_SUCCESS);
5533 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5534 (we handle buferring so as to have visibility of fill level). */
5538 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5539 if (expand_string_message)
5540 if (thismessage_size_limit == -1)
5541 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5542 "message_size_limit: %s", expand_string_message);
5544 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5545 "message_size_limit: %s", expand_string_message);
5547 setvbuf(stdin, NULL, _IONBF, 0);
5550 /* Loop for several messages when reading SMTP input. If we fork any child
5551 processes, we don't want to wait for them unless synchronous delivery is
5552 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5553 same as SIG_DFL, despite the fact that documentation often lists the default as
5554 "ignore". This is a confusing area. This is what I know:
5556 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5557 processes that complete simply to go away without ever becoming defunct. You
5558 can't then wait for them - but we don't want to wait for them in the
5559 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5560 happen for all OS (e.g. *BSD is different).
5562 But that's not the end of the story. Some (many? all?) systems have the
5563 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5564 has by default, so it seems that the difference is merely one of default
5565 (compare restarting vs non-restarting signals).
5567 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5568 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5569 of the loop below. Paranoia rules.
5571 February 2003: That's *still* not the end of the story. There are now versions
5572 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5573 process then calls waitpid(), a grumble is written to the system log, because
5574 this is logically inconsistent. In other words, it doesn't like the paranoia.
5575 As a consequence of this, the waitpid() below is now excluded if we are sure
5576 that SIG_IGN works. */
5578 if (!f.synchronous_delivery)
5581 struct sigaction act;
5582 act.sa_handler = SIG_IGN;
5583 sigemptyset(&(act.sa_mask));
5584 act.sa_flags = SA_NOCLDWAIT;
5585 sigaction(SIGCHLD, &act, NULL);
5587 signal(SIGCHLD, SIG_IGN);
5591 /* Save the current store pool point, for resetting at the start of
5592 each message, and save the real sender address, if any. */
5594 real_sender_address = sender_address;
5596 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5597 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5600 for (BOOL more = TRUE; more; )
5602 rmark reset_point = store_mark();
5605 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5606 input and build the recipients list, before calling receive_msg() to read the
5607 message proper. Whatever sender address is given in the SMTP transaction is
5608 often ignored for local senders - we use the actual sender, which is normally
5609 either the underlying user running this process or a -f argument provided by
5610 a trusted caller. It is saved in real_sender_address. The test for whether to
5611 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5616 if ((rc = smtp_setup_msg()) > 0)
5618 if (real_sender_address != NULL &&
5619 !receive_check_set_sender(sender_address))
5621 sender_address = raw_sender = real_sender_address;
5622 sender_address_unrewritten = NULL;
5625 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5626 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5627 the very end. The result of the ACL is ignored (as for other non-SMTP
5628 messages). It is run for its potential side effects. */
5630 if (smtp_batched_input && acl_not_smtp_start != NULL)
5632 uschar *user_msg, *log_msg;
5633 f.enable_dollar_recipients = TRUE;
5634 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5635 &user_msg, &log_msg);
5636 f.enable_dollar_recipients = FALSE;
5639 /* Now get the data for the message */
5641 more = receive_msg(extract_recipients);
5644 cancel_cutthrough_connection(TRUE, US"receive dropped");
5645 if (more) goto MORELOOP;
5646 smtp_log_no_mail(); /* Log no mail if configured */
5647 exim_exit(EXIT_FAILURE);
5652 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5653 smtp_log_no_mail(); /* Log no mail if configured */
5654 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5658 /* In the non-SMTP case, we have all the information from the command
5659 line, but must process it in case it is in the more general RFC822
5660 format, and in any case, to detect syntax errors. Also, it appears that
5661 the use of comma-separated lists as single arguments is common, so we
5662 had better support them. */
5667 int count = argc - recipients_arg;
5668 uschar **list = argv + recipients_arg;
5670 /* These options cannot be changed dynamically for non-SMTP messages */
5672 f.active_local_sender_retain = local_sender_retain;
5673 f.active_local_from_check = local_from_check;
5675 /* Save before any rewriting */
5677 raw_sender = string_copy(sender_address);
5679 /* Loop for each argument (supplied by user hence tainted) */
5681 for (int i = 0; i < count; i++)
5683 int start, end, domain;
5685 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5686 * We'll still want to cap it to something, just in case. */
5687 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5689 /* Loop for each comma-separated address */
5693 BOOL finished = FALSE;
5695 uschar *ss = parse_find_address_end(s, FALSE);
5697 if (*ss == ',') *ss = 0; else finished = TRUE;
5699 /* Check max recipients - if -t was used, these aren't recipients */
5701 if (recipients_max > 0 && ++rcount > recipients_max &&
5702 !extract_recipients)
5703 if (error_handling == ERRORS_STDERR)
5705 fprintf(stderr, "exim: too many recipients\n");
5706 exim_exit(EXIT_FAILURE);
5710 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5711 errors_sender_rc : EXIT_FAILURE;
5715 BOOL b = allow_utf8_domains;
5716 allow_utf8_domains = TRUE;
5719 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5723 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5724 else allow_utf8_domains = b;
5729 if (domain == 0 && !f.allow_unqualified_recipient)
5732 errmess = US"unqualified recipient address not allowed";
5736 if (error_handling == ERRORS_STDERR)
5738 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5739 string_printing(list[i]), errmess);
5740 exim_exit(EXIT_FAILURE);
5746 eblock.text1 = string_printing(list[i]);
5747 eblock.text2 = errmess;
5749 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5750 errors_sender_rc : EXIT_FAILURE;
5753 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5756 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5760 /* Show the recipients when debugging */
5764 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5765 if (recipients_list)
5767 debug_printf("Recipients:\n");
5768 for (int i = 0; i < recipients_count; i++)
5769 debug_printf(" %s\n", recipients_list[i].address);
5773 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5774 ignored; rejecting here would just add complication, and it can just as
5775 well be done later. Allow $recipients to be visible in the ACL. */
5777 if (acl_not_smtp_start)
5779 uschar *user_msg, *log_msg;
5780 f.enable_dollar_recipients = TRUE;
5781 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5782 &user_msg, &log_msg);
5783 f.enable_dollar_recipients = FALSE;
5786 /* Pause for a while waiting for input. If none received in that time,
5787 close the logfile, if we had one open; then if we wait for a long-running
5788 datasource (months, in one use-case) log rotation will not leave us holding
5791 if (!receive_timeout)
5792 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5795 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5796 will just read the headers for the message, and not write anything onto the
5799 message_ended = END_NOTENDED;
5800 more = receive_msg(extract_recipients);
5802 /* more is always FALSE here (not SMTP message) when reading a message
5803 for real; when reading the headers of a message for filter testing,
5804 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5806 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5807 } /* Non-SMTP message reception */
5809 /* If this is a filter testing run, there are headers in store, but
5810 no message on the spool. Run the filtering code in testing mode, setting
5811 the domain to the qualify domain and the local part to the current user,
5812 unless they have been set by options. The prefix and suffix are left unset
5813 unless specified. The the return path is set to to the sender unless it has
5814 already been set from a return-path header in the message. */
5816 if (filter_test != FTEST_NONE)
5818 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5819 deliver_domain_orig = deliver_domain;
5820 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5821 deliver_localpart_orig = deliver_localpart;
5822 deliver_localpart_prefix = US ftest_prefix;
5823 deliver_localpart_suffix = US ftest_suffix;
5824 deliver_home = originator_home;
5828 printf("Return-path copied from sender\n");
5829 return_path = string_copy(sender_address);
5832 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5833 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5835 receive_add_recipient(
5836 string_sprintf("%s%s%s@%s",
5837 ftest_prefix ? ftest_prefix : US"",
5839 ftest_suffix ? ftest_suffix : US"",
5840 deliver_domain), -1);
5842 printf("Recipient = %s\n", recipients_list[0].address);
5843 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5844 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5846 if (chdir("/")) /* Get away from wherever the user is running this from */
5848 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5849 exim_exit(EXIT_FAILURE);
5852 /* Now we run either a system filter test, or a user filter test, or both.
5853 In the latter case, headers added by the system filter will persist and be
5854 available to the user filter. We need to copy the filter variables
5857 if (filter_test & FTEST_SYSTEM)
5858 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5859 exim_exit(EXIT_FAILURE);
5861 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5863 if (filter_test & FTEST_USER)
5864 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5865 exim_exit(EXIT_FAILURE);
5867 exim_exit(EXIT_SUCCESS);
5870 /* Else act on the result of message reception. We should not get here unless
5871 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5872 will be TRUE. If it is not, check on the number of messages received in this
5875 if ( !session_local_queue_only
5876 && smtp_accept_queue_per_connection > 0
5877 && receive_messagecount > smtp_accept_queue_per_connection)
5879 session_local_queue_only = TRUE;
5880 queue_only_reason = 2;
5883 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5884 and queue_only_load is set, check that the load average is below it. If it is
5885 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5886 default), we put the whole session into queue_only mode. It then remains this
5887 way for any subsequent messages on the same SMTP connection. This is a
5888 deliberate choice; even though the load average may fall, it doesn't seem
5889 right to deliver later messages on the same call when not delivering earlier
5890 ones. However, there are odd cases where this is not wanted, so this can be
5891 changed by setting queue_only_load_latch false. */
5893 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5894 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5896 queue_only_reason = 3;
5897 if (queue_only_load_latch) session_local_queue_only = TRUE;
5900 /* If running as an MUA wrapper, all queueing options and freezing options
5904 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5906 /* Log the queueing here, when it will get a message id attached, but
5907 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5910 if (local_queue_only)
5912 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5913 switch(queue_only_reason)
5916 log_write(L_delay_delivery,
5917 LOG_MAIN, "no immediate delivery: more than %d messages "
5918 "received in one connection", smtp_accept_queue_per_connection);
5922 log_write(L_delay_delivery,
5923 LOG_MAIN, "no immediate delivery: load average %.2f",
5924 (double)load_average/1000.0);
5929 else if (f.queue_only_policy || f.deliver_freeze)
5930 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5932 /* Else do the delivery unless the ACL or local_scan() called for queue only
5933 or froze the message. Always deliver in a separate process. A fork failure is
5934 not a disaster, as the delivery will eventually happen on a subsequent queue
5935 run. The search cache must be tidied before the fork, as the parent will
5936 do it before exiting. The child will trigger a lookup failure and
5937 thereby defer the delivery if it tries to use (for example) a cached ldap
5938 connection that the parent has called unbind on. */
5945 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5948 close_unwanted(); /* Close unwanted file descriptors and TLS */
5949 exim_nullstd(); /* Ensure std{in,out,err} exist */
5951 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5952 mode, deliver_drop_privilege is forced TRUE). */
5954 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5956 delivery_re_exec(CEE_EXEC_EXIT);
5957 /* Control does not return here. */
5960 /* No need to re-exec */
5962 rc = deliver_message(message_id, FALSE, FALSE);
5964 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5965 ? EXIT_SUCCESS : EXIT_FAILURE);
5970 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5971 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5972 "process: %s", strerror(errno));
5976 release_cutthrough_connection(US"msg passed for delivery");
5978 /* In the parent, wait if synchronous delivery is required. This will
5979 always be the case in MUA wrapper mode. */
5981 if (f.synchronous_delivery)
5984 while (wait(&status) != pid);
5985 if ((status & 0x00ff) != 0)
5986 log_write(0, LOG_MAIN|LOG_PANIC,
5987 "process %d crashed with signal %d while delivering %s",
5988 (int)pid, status & 0x00ff, message_id);
5989 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5994 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5995 automatically reaps children (see comments above the loop), clear away any
5996 finished subprocesses here, in case there are lots of messages coming in
5997 from the same source. */
5999 #ifndef SIG_IGN_WORKS
6000 while (waitpid(-1, NULL, WNOHANG) > 0);
6004 return_path = sender_address = NULL;
6005 authenticated_sender = NULL;
6006 deliver_localpart_orig = NULL;
6007 deliver_domain_orig = NULL;
6008 deliver_host = deliver_host_address = NULL;
6009 dnslist_domain = dnslist_matched = NULL;
6010 #ifdef WITH_CONTENT_SCAN
6011 malware_name = NULL;
6013 callout_address = NULL;
6014 sending_ip_address = NULL;
6015 deliver_localpart_data = deliver_domain_data =
6016 recipient_data = sender_data = NULL;
6018 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6020 store_reset(reset_point);
6023 exim_exit(EXIT_SUCCESS); /* Never returns */
6024 return 0; /* To stop compiler warning */