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_db_version(FILE * f)
960 #ifdef DB_VERSION_STRING
963 fprintf(f, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
964 fprintf(f, " Runtime: %s\n",
965 db_version(NULL, NULL, NULL));
968 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
970 #elif defined(BTREEVERSION) && defined(HASHVERSION)
972 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
974 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
977 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
978 fprintf(f, "Probably ndbm\n");
979 #elif defined(USE_TDB)
980 fprintf(f, "Using tdb\n");
983 fprintf(f, "Probably GDBM (native mode)\n");
985 fprintf(f, "Probably GDBM (compatibility mode)\n");
991 /* This function is called for -bV/--version and for -d to output the optional
992 features of the current Exim binary.
994 Arguments: a FILE for printing
999 show_whats_supported(FILE * fp)
1001 rmark reset_point = store_mark();
1003 DEBUG(D_any) {} else show_db_version(fp);
1005 g = string_cat(NULL, US"Support for:");
1006 #ifdef SUPPORT_CRYPTEQ
1007 g = string_cat(g, US" crypteq");
1010 g = string_cat(g, US" iconv()");
1013 g = string_cat(g, US" IPv6");
1015 #ifdef HAVE_SETCLASSRESOURCES
1016 g = string_cat(g, US" use_setclassresources");
1019 g = string_cat(g, US" PAM");
1022 g = string_cat(g, US" Perl");
1024 #ifdef EXPAND_DLFUNC
1025 g = string_cat(g, US" Expand_dlfunc");
1027 #ifdef USE_TCP_WRAPPERS
1028 g = string_cat(g, US" TCPwrappers");
1031 g = string_cat(g, US" GnuTLS");
1034 g = string_cat(g, US" OpenSSL");
1036 #ifndef DISABLE_TLS_RESUME
1037 g = string_cat(g, US" TLS_resume");
1039 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1040 g = string_cat(g, US" translate_ip_address");
1042 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1043 g = string_cat(g, US" move_frozen_messages");
1045 #ifdef WITH_CONTENT_SCAN
1046 g = string_cat(g, US" Content_Scanning");
1049 g = string_cat(g, US" DANE");
1051 #ifndef DISABLE_DKIM
1052 g = string_cat(g, US" DKIM");
1054 #ifdef SUPPORT_DMARC
1055 g = string_cat(g, US" DMARC");
1057 #ifndef DISABLE_DNSSEC
1058 g = string_cat(g, US" DNSSEC");
1060 #ifndef DISABLE_EVENT
1061 g = string_cat(g, US" Event");
1064 g = string_cat(g, US" I18N");
1066 #ifndef DISABLE_OCSP
1067 g = string_cat(g, US" OCSP");
1069 #ifndef DISABLE_PIPE_CONNECT
1070 g = string_cat(g, US" PIPECONNECT");
1072 #ifndef DISABLE_PRDR
1073 g = string_cat(g, US" PRDR");
1075 #ifdef SUPPORT_PROXY
1076 g = string_cat(g, US" PROXY");
1078 #ifndef DISABLE_QUEUE_RAMP
1079 g = string_cat(g, US" Queue_Ramp");
1081 #ifdef SUPPORT_SOCKS
1082 g = string_cat(g, US" SOCKS");
1085 g = string_cat(g, US" SPF");
1087 #if defined(SUPPORT_SRS)
1088 g = string_cat(g, US" SRS");
1092 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1094 #ifdef EXPERIMENTAL_ARC
1095 g = string_cat(g, US" Experimental_ARC");
1097 #ifdef EXPERIMENTAL_BRIGHTMAIL
1098 g = string_cat(g, US" Experimental_Brightmail");
1100 #ifdef EXPERIMENTAL_DCC
1101 g = string_cat(g, US" Experimental_DCC");
1103 #ifdef EXPERIMENTAL_DSN_INFO
1104 g = string_cat(g, US" Experimental_DSN_info");
1106 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1107 g = string_cat(g, US" Experimental_ESMTP_Limits");
1109 #ifdef EXPERIMENTAL_QUEUEFILE
1110 g = string_cat(g, US" Experimental_QUEUEFILE");
1112 #if defined(EXPERIMENTAL_SRS_ALT)
1113 g = string_cat(g, US" Experimental_SRS");
1115 g = string_cat(g, US"\n");
1117 g = string_cat(g, US"Lookups (built-in):");
1118 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1119 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1121 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1122 g = string_cat(g, US" cdb");
1124 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1125 g = string_cat(g, US" dbm dbmjz dbmnz");
1127 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1128 g = string_cat(g, US" dnsdb");
1130 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1131 g = string_cat(g, US" dsearch");
1133 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1134 g = string_cat(g, US" ibase");
1136 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1137 g = string_cat(g, US" json");
1139 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1140 g = string_cat(g, US" ldap ldapdn ldapm");
1143 g = string_cat(g, US" lmdb");
1145 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1146 g = string_cat(g, US" mysql");
1148 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1149 g = string_cat(g, US" nis nis0");
1151 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1152 g = string_cat(g, US" nisplus");
1154 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1155 g = string_cat(g, US" oracle");
1157 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1158 g = string_cat(g, US" passwd");
1160 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1161 g = string_cat(g, US" pgsql");
1163 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1164 g = string_cat(g, US" redis");
1166 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1167 g = string_cat(g, US" sqlite");
1169 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1170 g = string_cat(g, US" testdb");
1172 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1173 g = string_cat(g, US" whoson");
1175 g = string_cat(g, US"\n");
1177 g = auth_show_supported(g);
1178 g = route_show_supported(g);
1179 g = transport_show_supported(g);
1181 #ifdef WITH_CONTENT_SCAN
1182 g = malware_show_supported(g);
1185 if (fixed_never_users[0] > 0)
1188 g = string_cat(g, US"Fixed never_users: ");
1189 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1190 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1191 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1194 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1195 fputs(CS string_from_gstring(g), fp);
1197 fprintf(fp, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1199 /* Everything else is details which are only worth reporting when debugging.
1200 Perhaps the tls_version_report should move into this too. */
1203 /* clang defines __GNUC__ (at least, for me) so test for it first */
1204 #if defined(__clang__)
1205 fprintf(fp, "Compiler: CLang [%s]\n", __clang_version__);
1206 #elif defined(__GNUC__)
1207 fprintf(fp, "Compiler: GCC [%s]\n",
1211 "? unknown version ?"
1215 fprintf(fp, "Compiler: <unknown>\n");
1218 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1219 fprintf(fp, "Library version: Glibc: Compile: %d.%d\n",
1220 __GLIBC__, __GLIBC_MINOR__);
1221 if (__GLIBC_PREREQ(2, 1))
1222 fprintf(fp, " Runtime: %s\n",
1223 gnu_get_libc_version());
1226 show_db_version(fp);
1229 tls_version_report(fp);
1232 utf8_version_report(fp);
1234 #ifdef SUPPORT_DMARC
1235 dmarc_version_report(fp);
1238 spf_lib_version_report(fp);
1241 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1242 if (authi->version_report)
1243 (*authi->version_report)(fp);
1245 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1246 characters; unless it's an ancient version of PCRE in which case it
1248 #ifndef PCRE_PRERELEASE
1249 # define PCRE_PRERELEASE
1252 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1255 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1256 fprintf(fp, "Library version: PCRE2: Compile: %d.%d%s\n"
1258 PCRE2_MAJOR, PCRE2_MINOR,
1259 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1263 #undef EXPAND_AND_QUOTE
1266 for (int i = 0; i < lookup_list_count; i++)
1267 if (lookup_list[i]->version_report)
1268 lookup_list[i]->version_report(fp);
1270 #ifdef WHITELIST_D_MACROS
1271 fprintf(fp, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1273 fprintf(fp, "WHITELIST_D_MACROS unset\n");
1275 #ifdef TRUSTED_CONFIG_LIST
1276 fprintf(fp, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1278 fprintf(fp, "TRUSTED_CONFIG_LIST unset\n");
1282 store_reset(reset_point);
1286 /*************************************************
1287 * Show auxiliary information about Exim *
1288 *************************************************/
1291 show_exim_information(enum commandline_info request, FILE *stream)
1296 fprintf(stream, "Oops, something went wrong.\n");
1300 "The -bI: flag takes a string indicating which information to provide.\n"
1301 "If the string is not recognised, you'll get this help (on stderr).\n"
1303 " exim -bI:help this information\n"
1304 " exim -bI:dscp list of known dscp value keywords\n"
1305 " exim -bI:sieve list of supported sieve extensions\n"
1309 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1310 fprintf(stream, "%s\n", *pp);
1313 dscp_list_to_stream(stream);
1319 /*************************************************
1320 * Quote a local part *
1321 *************************************************/
1323 /* This function is used when a sender address or a From: or Sender: header
1324 line is being created from the caller's login, or from an authenticated_id. It
1325 applies appropriate quoting rules for a local part.
1327 Argument: the local part
1328 Returns: the local part, quoted if necessary
1332 local_part_quote(uschar *lpart)
1334 BOOL needs_quote = FALSE;
1337 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1339 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1340 (*t != '.' || t == lpart || t[1] == 0);
1343 if (!needs_quote) return lpart;
1345 g = string_catn(NULL, US"\"", 1);
1349 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1352 g = string_cat(g, lpart);
1355 g = string_catn(g, lpart, nq - lpart);
1356 g = string_catn(g, US"\\", 1);
1357 g = string_catn(g, nq, 1);
1361 g = string_catn(g, US"\"", 1);
1362 return string_from_gstring(g);
1368 /*************************************************
1369 * Load readline() functions *
1370 *************************************************/
1372 /* This function is called from testing executions that read data from stdin,
1373 but only when running as the calling user. Currently, only -be does this. The
1374 function loads the readline() function library and passes back the functions.
1375 On some systems, it needs the curses library, so load that too, but try without
1376 it if loading fails. All this functionality has to be requested at build time.
1379 fn_readline_ptr pointer to where to put the readline pointer
1380 fn_addhist_ptr pointer to where to put the addhistory function
1382 Returns: the dlopen handle or NULL on failure
1386 set_readline(char * (**fn_readline_ptr)(const char *),
1387 void (**fn_addhist_ptr)(const char *))
1390 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1392 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1393 if (dlhandle_curses) dlclose(dlhandle_curses);
1397 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1398 * char * readline (const char *prompt);
1399 * void add_history (const char *string);
1401 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1402 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1405 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1413 /*************************************************
1414 * Get a line from stdin for testing things *
1415 *************************************************/
1417 /* This function is called when running tests that can take a number of lines
1418 of input (for example, -be and -bt). It handles continuations and trailing
1419 spaces. And prompting and a blank line output on eof. If readline() is in use,
1420 the arguments are non-NULL and provide the relevant functions.
1423 fn_readline readline function or NULL
1424 fn_addhist addhist function or NULL
1426 Returns: pointer to dynamic memory, or NULL at end of file
1430 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1433 BOOL had_input = FALSE;
1435 if (!fn_readline) { printf("> "); fflush(stdout); }
1437 for (int i = 0;; i++)
1439 uschar buffer[1024];
1443 char *readline_line = NULL;
1446 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1447 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1448 p = US readline_line;
1453 /* readline() not in use */
1456 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1460 /* Handle the line */
1463 ss = p + Ustrlen(p);
1464 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1467 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1469 g = string_catn(g, p, ss - p);
1472 if (fn_readline) free(readline_line);
1475 /* g can only be NULL if ss==p */
1476 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1479 --g->ptr; /* drop the \ */
1482 if (had_input) return g ? string_from_gstring(g) : US"";
1489 /*************************************************
1490 * Output usage information for the program *
1491 *************************************************/
1493 /* This function is called when there are no recipients
1494 or a specific --help argument was added.
1497 progname information on what name we were called by
1499 Returns: DOES NOT RETURN
1503 exim_usage(uschar *progname)
1506 /* Handle specific program invocation variants */
1507 if (Ustrcmp(progname, US"-mailq") == 0)
1509 "mailq - list the contents of the mail queue\n\n"
1510 "For a list of options, see the Exim documentation.\n");
1512 /* Generic usage - we output this whatever happens */
1514 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1515 "not directly from a shell command line. Options and/or arguments control\n"
1516 "what it does when called. For a list of options, see the Exim documentation.\n");
1521 /*************************************************
1522 * Validate that the macros given are okay *
1523 *************************************************/
1525 /* Typically, Exim will drop privileges if macros are supplied. In some
1526 cases, we want to not do so.
1528 Arguments: opt_D_used - true if the commandline had a "-D" option
1529 Returns: true if trusted, false otherwise
1533 macros_trusted(BOOL opt_D_used)
1535 #ifdef WHITELIST_D_MACROS
1536 uschar *whitelisted, *end, *p, **whites;
1537 int white_count, i, n;
1539 BOOL prev_char_item, found;
1544 #ifndef WHITELIST_D_MACROS
1548 /* We only trust -D overrides for some invoking users:
1549 root, the exim run-time user, the optional config owner user.
1550 I don't know why config-owner would be needed, but since they can own the
1551 config files anyway, there's no security risk to letting them override -D. */
1552 if ( ! ((real_uid == root_uid)
1553 || (real_uid == exim_uid)
1554 #ifdef CONFIGURE_OWNER
1555 || (real_uid == config_uid)
1559 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1563 /* Get a list of macros which are whitelisted */
1564 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1565 prev_char_item = FALSE;
1567 for (p = whitelisted; *p != '\0'; ++p)
1569 if (*p == ':' || isspace(*p))
1574 prev_char_item = FALSE;
1577 if (!prev_char_item)
1578 prev_char_item = TRUE;
1585 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1586 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1591 if (i == white_count)
1593 while (*p != '\0' && p < end)
1599 /* The list of commandline macros should be very short.
1600 Accept the N*M complexity. */
1601 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1604 for (uschar ** w = whites; *w; ++w)
1605 if (Ustrcmp(*w, m->name) == 0)
1612 if (!m->replacement)
1614 if ((len = m->replen) == 0)
1616 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1619 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1625 /*************************************************
1626 * Expansion testing *
1627 *************************************************/
1629 /* Expand and print one item, doing macro-processing.
1632 item line for expansion
1636 expansion_test_line(const uschar * line)
1642 Ustrncpy(big_buffer, line, big_buffer_size);
1643 big_buffer[big_buffer_size-1] = '\0';
1644 len = Ustrlen(big_buffer);
1646 (void) macros_expand(0, &len, &dummy_macexp);
1648 if (isupper(big_buffer[0]))
1650 if (macro_read_assignment(big_buffer))
1651 printf("Defined macro '%s'\n", mlast->name);
1654 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1655 else printf("Failed: %s\n", expand_string_message);
1660 /*************************************************
1661 * Entry point and high-level code *
1662 *************************************************/
1664 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1665 the appropriate action. All the necessary functions are present in the one
1666 binary. I originally thought one should split it up, but it turns out that so
1667 much of the apparatus is needed in each chunk that one might as well just have
1668 it all available all the time, which then makes the coding easier as well.
1671 argc count of entries in argv
1672 argv argument strings, with argv[0] being the program name
1674 Returns: EXIT_SUCCESS if terminated successfully
1675 EXIT_FAILURE otherwise, except when a message has been sent
1676 to the sender, and -oee was given
1680 main(int argc, char **cargv)
1682 uschar **argv = USS cargv;
1683 int arg_receive_timeout = -1;
1684 int arg_smtp_receive_timeout = -1;
1685 int arg_error_handling = error_handling;
1686 int filter_sfd = -1;
1687 int filter_ufd = -1;
1690 int list_queue_option = 0;
1692 int msg_action_arg = -1;
1693 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1694 int queue_only_reason = 0;
1696 int perl_start_option = 0;
1698 int recipients_arg = argc;
1699 int sender_address_domain = 0;
1700 int test_retry_arg = -1;
1701 int test_rewrite_arg = -1;
1702 gid_t original_egid;
1703 BOOL arg_queue_only = FALSE;
1704 BOOL bi_option = FALSE;
1705 BOOL checking = FALSE;
1706 BOOL count_queue = FALSE;
1707 BOOL expansion_test = FALSE;
1708 BOOL extract_recipients = FALSE;
1709 BOOL flag_G = FALSE;
1710 BOOL flag_n = FALSE;
1711 BOOL forced_delivery = FALSE;
1712 BOOL f_end_dot = FALSE;
1713 BOOL deliver_give_up = FALSE;
1714 BOOL list_queue = FALSE;
1715 BOOL list_options = FALSE;
1716 BOOL list_config = FALSE;
1717 BOOL local_queue_only;
1718 BOOL one_msg_action = FALSE;
1719 BOOL opt_D_used = FALSE;
1720 BOOL queue_only_set = FALSE;
1721 BOOL receiving_message = TRUE;
1722 BOOL sender_ident_set = FALSE;
1723 BOOL session_local_queue_only;
1725 BOOL removed_privilege = FALSE;
1726 BOOL usage_wanted = FALSE;
1727 BOOL verify_address_mode = FALSE;
1728 BOOL verify_as_sender = FALSE;
1729 BOOL rcpt_verify_quota = FALSE;
1730 BOOL version_printed = FALSE;
1731 uschar *alias_arg = NULL;
1732 uschar *called_as = US"";
1733 uschar *cmdline_syslog_name = NULL;
1734 uschar *start_queue_run_id = NULL;
1735 uschar *stop_queue_run_id = NULL;
1736 uschar *expansion_test_message = NULL;
1737 const uschar *ftest_domain = NULL;
1738 const uschar *ftest_localpart = NULL;
1739 const uschar *ftest_prefix = NULL;
1740 const uschar *ftest_suffix = NULL;
1741 uschar *log_oneline = NULL;
1742 uschar *malware_test_file = NULL;
1743 uschar *real_sender_address;
1744 uschar *originator_home = US"/";
1748 struct stat statbuf;
1749 pid_t passed_qr_pid = (pid_t)0;
1750 int passed_qr_pipe = -1;
1751 gid_t group_list[EXIM_GROUPLIST_SIZE];
1753 /* For the -bI: flag */
1754 enum commandline_info info_flag = CMDINFO_NONE;
1755 BOOL info_stdout = FALSE;
1757 /* Possible options for -R and -S */
1759 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1761 /* Need to define this in case we need to change the environment in order
1762 to get rid of a bogus time zone. We have to make it char rather than uschar
1763 because some OS define it in /usr/include/unistd.h. */
1765 extern char **environ;
1767 #ifdef MEASURE_TIMING
1768 (void)gettimeofday(×tamp_startup, NULL);
1771 store_init(); /* Initialise the memory allocation susbsystem */
1772 pcre_init(); /* Set up memory handling for pcre */
1774 /* If the Exim user and/or group and/or the configuration file owner/group were
1775 defined by ref:name at build time, we must now find the actual uid/gid values.
1776 This is a feature to make the lives of binary distributors easier. */
1778 #ifdef EXIM_USERNAME
1779 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1782 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1784 /* If ref:name uses a number as the name, route_finduser() returns
1785 TRUE with exim_uid set and pw coerced to NULL. */
1787 exim_gid = pw->pw_gid;
1788 #ifndef EXIM_GROUPNAME
1791 "exim: ref:name should specify a usercode, not a group.\n"
1792 "exim: can't let you get away with it unless you also specify a group.\n");
1796 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1799 #ifdef EXIM_GROUPNAME
1800 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1801 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1804 #ifdef CONFIGURE_OWNERNAME
1805 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1806 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1807 CONFIGURE_OWNERNAME);
1810 /* We default the system_filter_user to be the Exim run-time user, as a
1811 sane non-root value. */
1812 system_filter_uid = exim_uid;
1814 #ifdef CONFIGURE_GROUPNAME
1815 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1816 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1817 CONFIGURE_GROUPNAME);
1820 /* In the Cygwin environment, some initialization used to need doing.
1821 It was fudged in by means of this macro; now no longer but we'll leave
1822 it in case of others. */
1828 /* Check a field which is patched when we are running Exim within its
1829 testing harness; do a fast initial check, and then the whole thing. */
1831 f.running_in_test_harness =
1832 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1833 if (f.running_in_test_harness)
1836 /* Protect against abusive argv[0] */
1837 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1839 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1840 at the start of a program; however, it seems that some environments do not
1841 follow this. A "strange" locale can affect the formatting of timestamps, so we
1844 setlocale(LC_ALL, "C");
1846 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1848 #ifdef _POSIX_MONOTONIC_CLOCK
1852 /* Set up the default handler for timing using alarm(). */
1854 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1856 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1857 because store_malloc writes a log entry on failure. */
1859 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1860 exim_fail("exim: failed to get store for log buffer\n");
1862 /* Initialize the default log options. */
1864 bits_set(log_selector, log_selector_size, log_default);
1866 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1867 NULL when the daemon is run and the file is closed. We have to use this
1868 indirection, because some systems don't allow writing to the variable "stderr".
1871 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1873 /* Ensure there is a big buffer for temporary use in several places. It is put
1874 in malloc store so that it can be freed for enlargement if necessary. */
1876 big_buffer = store_malloc(big_buffer_size);
1878 /* Set up the handler for the data request signal, and set the initial
1879 descriptive text. */
1881 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1882 set_process_info("initializing");
1883 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1886 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1887 sigaction(SIGSEGV, &act, NULL);
1890 signal(SIGSEGV, segv_handler); /* log faults */
1893 /* If running in a dockerized environment, the TERM signal is only
1894 delegated to the PID 1 if we request it by setting an signal handler */
1895 if (getpid() == 1) signal(SIGTERM, term_handler);
1897 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1898 in the daemon code. For the rest of Exim's uses, we ignore it. */
1900 signal(SIGHUP, SIG_IGN);
1902 /* We don't want to die on pipe errors as the code is written to handle
1903 the write error instead. */
1905 signal(SIGPIPE, SIG_IGN);
1907 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1908 set to SIG_IGN. This causes subprocesses that complete before the parent
1909 process waits for them not to hang around, so when Exim calls wait(), nothing
1910 is there. The wait() code has been made robust against this, but let's ensure
1911 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1912 ending status. We use sigaction rather than plain signal() on those OS where
1913 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1914 problem on AIX with this.) */
1918 struct sigaction act;
1919 act.sa_handler = SIG_DFL;
1920 sigemptyset(&(act.sa_mask));
1922 sigaction(SIGCHLD, &act, NULL);
1925 signal(SIGCHLD, SIG_DFL);
1928 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1933 /* Set up the version number. Set up the leading 'E' for the external form of
1934 message ids, set the pointer to the internal form, and initialize it to
1935 indicate no message being processed. */
1938 message_id_option[0] = '-';
1939 message_id_external = message_id_option + 1;
1940 message_id_external[0] = 'E';
1941 message_id = message_id_external + 1;
1944 /* Set the umask to zero so that any files Exim creates using open() are
1945 created with the modes that it specifies. NOTE: Files created with fopen() have
1946 a problem, which was not recognized till rather late (February 2006). With this
1947 umask, such files will be world writeable. (They are all content scanning files
1948 in the spool directory, which isn't world-accessible, so this is not a
1949 disaster, but it's untidy.) I don't want to change this overall setting,
1950 however, because it will interact badly with the open() calls. Instead, there's
1951 now a function called modefopen() that fiddles with the umask while calling
1956 /* Precompile the regular expression for matching a message id. Keep this in
1957 step with the code that generates ids in the accept.c module. We need to do
1958 this here, because the -M options check their arguments for syntactic validity
1959 using mac_ismsgid, which uses this. */
1962 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1964 /* Precompile the regular expression that is used for matching an SMTP error
1965 code, possibly extended, at the start of an error message. Note that the
1966 terminating whitespace character is included. */
1969 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1972 #ifdef WHITELIST_D_MACROS
1973 /* Precompile the regular expression used to filter the content of macros
1974 given to -D for permissibility. */
1976 regex_whitelisted_macro =
1977 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1980 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1982 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1983 this seems to be a generally accepted convention, since one finds symbolic
1984 links called "mailq" in standard OS configurations. */
1986 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1987 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1990 receiving_message = FALSE;
1991 called_as = US"-mailq";
1994 /* If the program is called as "rmail" treat it as equivalent to
1995 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1996 i.e. preventing a single dot on a line from terminating the message, and
1997 returning with zero return code, even in cases of error (provided an error
1998 message has been sent). */
2000 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2001 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2004 called_as = US"-rmail";
2005 errors_sender_rc = EXIT_SUCCESS;
2008 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2009 this is a smail convention. */
2011 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2012 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2014 smtp_input = smtp_batched_input = TRUE;
2015 called_as = US"-rsmtp";
2018 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2019 this is a smail convention. */
2021 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2022 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2025 receiving_message = FALSE;
2026 called_as = US"-runq";
2029 /* If the program is called as "newaliases" treat it as equivalent to
2030 "exim -bi"; this is a sendmail convention. */
2032 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2033 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2036 receiving_message = FALSE;
2037 called_as = US"-newaliases";
2040 /* Save the original effective uid for a couple of uses later. It should
2041 normally be root, but in some esoteric environments it may not be. */
2043 original_euid = geteuid();
2044 original_egid = getegid();
2046 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2047 to be the same as the real ones. This makes a difference only if Exim is setuid
2048 (or setgid) to something other than root, which could be the case in some
2049 special configurations. */
2051 real_uid = getuid();
2052 real_gid = getgid();
2054 if (real_uid == root_uid)
2056 if ((rv = setgid(real_gid)))
2057 exim_fail("exim: setgid(%ld) failed: %s\n",
2058 (long int)real_gid, strerror(errno));
2059 if ((rv = setuid(real_uid)))
2060 exim_fail("exim: setuid(%ld) failed: %s\n",
2061 (long int)real_uid, strerror(errno));
2064 /* If neither the original real uid nor the original euid was root, Exim is
2065 running in an unprivileged state. */
2067 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2069 /* For most of the args-parsing we need to use permanent pool memory */
2071 int old_pool = store_pool;
2072 store_pool = POOL_PERM;
2074 /* Scan the program's arguments. Some can be dealt with right away; others are
2075 simply recorded for checking and handling afterwards. Do a high-level switch
2076 on the second character (the one after '-'), to save some effort. */
2078 for (i = 1; i < argc; i++)
2080 BOOL badarg = FALSE;
2081 uschar * arg = argv[i];
2085 /* An argument not starting with '-' is the start of a recipients list;
2086 break out of the options-scanning loop. */
2094 /* An option consisting of -- terminates the options */
2096 if (Ustrcmp(arg, "--") == 0)
2098 recipients_arg = i + 1;
2102 /* Handle flagged options */
2104 switchchar = arg[1];
2107 /* Make all -ex options synonymous with -oex arguments, since that
2108 is assumed by various callers. Also make -qR options synonymous with -R
2109 options, as that seems to be required as well. Allow for -qqR too, and
2110 the same for -S options. */
2112 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2113 Ustrncmp(arg+1, "qR", 2) == 0 ||
2114 Ustrncmp(arg+1, "qS", 2) == 0)
2116 switchchar = arg[2];
2119 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2121 switchchar = arg[3];
2123 f.queue_2stage = TRUE;
2126 /* Make -r synonymous with -f, since it is a documented alias */
2128 else if (arg[1] == 'r') switchchar = 'f';
2130 /* Make -ov synonymous with -v */
2132 else if (Ustrcmp(arg, "-ov") == 0)
2138 /* deal with --option_aliases */
2139 else if (switchchar == '-')
2141 if (Ustrcmp(argrest, "help") == 0)
2143 usage_wanted = TRUE;
2146 else if (Ustrcmp(argrest, "version") == 0)
2153 /* High-level switch on active initial letter */
2158 /* sendmail uses -Ac and -Am to control which .cf file is used;
2161 if (!*argrest) { badarg = TRUE; break; }
2164 BOOL ignore = FALSE;
2169 if (*(argrest + 1) == '\0')
2173 if (!ignore) badarg = TRUE;
2177 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2178 so has no need of it. */
2181 if (!*argrest) i++; /* Skip over the type */
2187 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2191 /* -bd: Run in daemon mode, awaiting SMTP connections.
2192 -bdf: Ditto, but in the foreground.
2195 f.daemon_listen = TRUE;
2196 if (*argrest == 'f') f.background_daemon = FALSE;
2197 else if (*argrest) badarg = TRUE;
2200 /* -be: Run in expansion test mode
2201 -bem: Ditto, but read a message from a file first
2204 expansion_test = checking = TRUE;
2205 if (*argrest == 'm')
2207 if (++i >= argc) { badarg = TRUE; break; }
2208 expansion_test_message = argv[i];
2211 if (*argrest) badarg = TRUE;
2214 /* -bF: Run system filter test */
2216 filter_test |= checking = FTEST_SYSTEM;
2217 if (*argrest) badarg = TRUE;
2218 else if (++i < argc) filter_test_sfile = argv[i];
2219 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2222 /* -bf: Run user filter test
2223 -bfd: Set domain for filter testing
2224 -bfl: Set local part for filter testing
2225 -bfp: Set prefix for filter testing
2226 -bfs: Set suffix for filter testing
2231 filter_test |= checking = FTEST_USER;
2232 if (++i < argc) filter_test_ufile = argv[i];
2233 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2238 exim_fail("exim: string expected after %s\n", arg);
2239 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2240 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2241 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2242 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2247 /* -bh: Host checking - an IP address must follow. */
2249 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2251 if (++i >= argc) { badarg = TRUE; break; }
2252 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2253 host_checking = checking = f.log_testing_mode = TRUE;
2254 f.host_checking_callout = *argrest == 'c';
2255 message_logs = FALSE;
2260 /* -bi: This option is used by sendmail to initialize *the* alias file,
2261 though it has the -oA option to specify a different file. Exim has no
2262 concept of *the* alias file, but since Sun's YP make script calls
2263 sendmail this way, some support must be provided. */
2265 if (!*argrest) bi_option = TRUE;
2269 /* -bI: provide information, of the type to follow after a colon.
2270 This is an Exim flag. */
2272 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2274 uschar *p = argrest+1;
2275 info_flag = CMDINFO_HELP;
2277 if (strcmpic(p, CUS"sieve") == 0)
2279 info_flag = CMDINFO_SIEVE;
2282 else if (strcmpic(p, CUS"dscp") == 0)
2284 info_flag = CMDINFO_DSCP;
2287 else if (strcmpic(p, CUS"help") == 0)
2293 /* -bm: Accept and deliver message - the default option. Reinstate
2294 receiving_message, which got turned off for all -b options.
2295 -bmalware: test the filename given for malware */
2297 if (!*argrest) receiving_message = TRUE;
2298 else if (Ustrcmp(argrest, "alware") == 0)
2300 if (++i >= argc) { badarg = TRUE; break; }
2302 malware_test_file = argv[i];
2307 /* -bnq: For locally originating messages, do not qualify unqualified
2308 addresses. In the envelope, this causes errors; in header lines they
2311 if (Ustrcmp(argrest, "q") == 0)
2313 f.allow_unqualified_sender = FALSE;
2314 f.allow_unqualified_recipient = FALSE;
2319 /* -bpxx: List the contents of the mail queue, in various forms. If
2320 the option is -bpc, just a queue count is needed. Otherwise, if the
2321 first letter after p is r, then order is random. */
2323 if (*argrest == 'c')
2326 if (*++argrest) badarg = TRUE;
2330 if (*argrest == 'r')
2332 list_queue_option = 8;
2335 else list_queue_option = 0;
2339 /* -bp: List the contents of the mail queue, top-level only */
2343 /* -bpu: List the contents of the mail queue, top-level undelivered */
2345 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2347 /* -bpa: List the contents of the mail queue, including all delivered */
2349 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2351 /* Unknown after -bp[r] */
2357 /* -bP: List the configuration variables given as the address list.
2358 Force -v, so configuration errors get displayed. */
2361 /* -bP config: we need to setup here, because later,
2362 when list_options is checked, the config is read already */
2365 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2368 readconf_save_config(version_string);
2372 list_options = TRUE;
2373 debug_selector |= D_v;
2374 debug_file = stderr;
2378 /* -brt: Test retry configuration lookup */
2380 if (Ustrcmp(argrest, "t") == 0)
2383 test_retry_arg = i + 1;
2387 /* -brw: Test rewrite configuration */
2389 else if (Ustrcmp(argrest, "w") == 0)
2392 test_rewrite_arg = i + 1;
2398 /* -bS: Read SMTP commands on standard input, but produce no replies -
2399 all errors are reported by sending messages. */
2402 smtp_input = smtp_batched_input = receiving_message = TRUE;
2406 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2407 on standard output. */
2409 if (!*argrest) smtp_input = receiving_message = TRUE;
2413 /* -bt: address testing mode */
2416 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2420 /* -bv: verify addresses */
2423 verify_address_mode = checking = f.log_testing_mode = TRUE;
2425 /* -bvs: verify sender addresses */
2427 else if (Ustrcmp(argrest, "s") == 0)
2429 verify_address_mode = checking = f.log_testing_mode = TRUE;
2430 verify_as_sender = TRUE;
2435 /* -bV: Print version string and support details */
2439 printf("Exim version %s #%s built %s\n", version_string,
2440 version_cnumber, version_date);
2441 printf("%s\n", CS version_copyright);
2442 version_printed = TRUE;
2443 show_whats_supported(stdout);
2444 f.log_testing_mode = TRUE;
2449 /* -bw: inetd wait mode, accept a listening socket as stdin */
2451 f.inetd_wait_mode = TRUE;
2452 f.background_daemon = FALSE;
2453 f.daemon_listen = TRUE;
2455 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2456 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2467 /* -C: change configuration file list; ignore if it isn't really
2468 a change! Enforce a prefix check if required. */
2472 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2473 if (Ustrcmp(config_main_filelist, argrest) != 0)
2475 #ifdef ALT_CONFIG_PREFIX
2477 int len = Ustrlen(ALT_CONFIG_PREFIX);
2478 const uschar *list = argrest;
2480 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2481 while((filename = string_nextinlist(&list, &sep, big_buffer,
2483 if ( ( Ustrlen(filename) < len
2484 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2485 || Ustrstr(filename, "/../") != NULL
2487 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2489 exim_fail("-C Permission denied\n");
2491 if (real_uid != root_uid)
2493 #ifdef TRUSTED_CONFIG_LIST
2495 if (real_uid != exim_uid
2496 #ifdef CONFIGURE_OWNER
2497 && real_uid != config_uid
2500 f.trusted_config = FALSE;
2503 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2506 struct stat statbuf;
2508 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2509 (statbuf.st_uid != root_uid /* owner not root */
2510 #ifdef CONFIGURE_OWNER
2511 && statbuf.st_uid != config_uid /* owner not the special one */
2514 (statbuf.st_gid != root_gid /* group not root */
2515 #ifdef CONFIGURE_GROUP
2516 && statbuf.st_gid != config_gid /* group not the special one */
2518 && (statbuf.st_mode & 020) != 0 /* group writeable */
2520 (statbuf.st_mode & 2) != 0) /* world writeable */
2522 f.trusted_config = FALSE;
2527 /* Well, the trust list at least is up to scratch... */
2529 uschar *trusted_configs[32];
2532 int old_pool = store_pool;
2533 store_pool = POOL_MAIN;
2535 reset_point = store_mark();
2536 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2538 uschar *start = big_buffer, *nl;
2539 while (*start && isspace(*start))
2543 nl = Ustrchr(start, '\n');
2546 trusted_configs[nr_configs++] = string_copy(start);
2547 if (nr_configs == nelem(trusted_configs))
2555 const uschar *list = argrest;
2557 while (f.trusted_config && (filename = string_nextinlist(&list,
2558 &sep, big_buffer, big_buffer_size)))
2560 for (i=0; i < nr_configs; i++)
2561 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2563 if (i == nr_configs)
2565 f.trusted_config = FALSE;
2570 else /* No valid prefixes found in trust_list file. */
2571 f.trusted_config = FALSE;
2572 store_reset(reset_point);
2573 store_pool = old_pool;
2576 else /* Could not open trust_list file. */
2577 f.trusted_config = FALSE;
2580 /* Not root; don't trust config */
2581 f.trusted_config = FALSE;
2585 config_main_filelist = argrest;
2586 f.config_changed = TRUE;
2591 /* -D: set up a macro definition */
2594 #ifdef DISABLE_D_OPTION
2595 exim_fail("exim: -D is not available in this Exim binary\n");
2601 uschar *s = argrest;
2604 while (isspace(*s)) s++;
2606 if (*s < 'A' || *s > 'Z')
2607 exim_fail("exim: macro name set by -D must start with "
2608 "an upper case letter\n");
2610 while (isalnum(*s) || *s == '_')
2612 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2616 if (ptr == 0) { badarg = TRUE; break; }
2617 while (isspace(*s)) s++;
2620 if (*s++ != '=') { badarg = TRUE; break; }
2621 while (isspace(*s)) s++;
2624 for (m = macros_user; m; m = m->next)
2625 if (Ustrcmp(m->name, name) == 0)
2626 exim_fail("exim: duplicated -D in command line\n");
2628 m = macro_create(name, s, TRUE);
2630 if (clmacro_count >= MAX_CLMACROS)
2631 exim_fail("exim: too many -D options on command line\n");
2632 clmacros[clmacro_count++] =
2633 string_sprintf("-D%s=%s", m->name, m->replacement);
2638 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2639 The latter is now a no-op, retained for compatibility only. If -dd is used,
2640 debugging subprocesses of the daemon is disabled. */
2643 if (Ustrcmp(argrest, "ropcr") == 0)
2645 /* drop_cr = TRUE; */
2648 /* Use an intermediate variable so that we don't set debugging while
2649 decoding the debugging bits. */
2653 unsigned int selector = D_default;
2656 if (*argrest == 'd')
2658 f.debug_daemon = TRUE;
2662 decode_bits(&selector, 1, debug_notall, argrest,
2663 debug_options, debug_options_count, US"debug", 0);
2664 debug_selector = selector;
2669 /* -E: This is a local error message. This option is not intended for
2670 external use at all, but is not restricted to trusted callers because it
2671 does no harm (just suppresses certain error messages) and if Exim is run
2672 not setuid root it won't always be trusted when it generates error
2673 messages using this option. If there is a message id following -E, point
2674 message_reference at it, for logging. */
2677 f.local_error_message = TRUE;
2678 if (mac_ismsgid(argrest)) message_reference = argrest;
2682 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2683 option, so it looks as if historically the -oex options are also callable
2684 without the leading -o. So we have to accept them. Before the switch,
2685 anything starting -oe has been converted to -e. Exim does not support all
2686 of the sendmail error options. */
2689 if (Ustrcmp(argrest, "e") == 0)
2691 arg_error_handling = ERRORS_SENDER;
2692 errors_sender_rc = EXIT_SUCCESS;
2694 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2695 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2696 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2697 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2702 /* -F: Set sender's full name, used instead of the gecos entry from
2703 the password file. Since users can usually alter their gecos entries,
2704 there's no security involved in using this instead. The data can follow
2705 the -F or be in the next argument. */
2709 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2710 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2711 f.sender_name_forced = TRUE;
2715 /* -f: Set sender's address - this value is only actually used if Exim is
2716 run by a trusted user, or if untrusted_set_sender is set and matches the
2717 address, except that the null address can always be set by any user. The
2718 test for this happens later, when the value given here is ignored when not
2719 permitted. For an untrusted user, the actual sender is still put in Sender:
2720 if it doesn't match the From: header (unless no_local_from_check is set).
2721 The data can follow the -f or be in the next argument. The -r switch is an
2722 obsolete form of -f but since there appear to be programs out there that
2723 use anything that sendmail has ever supported, better accept it - the
2724 synonymizing is done before the switch above.
2726 At this stage, we must allow domain literal addresses, because we don't
2727 know what the setting of allow_domain_literals is yet. Ditto for trailing
2728 dots and strip_trailing_dot. */
2732 int dummy_start, dummy_end;
2735 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2736 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2738 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2741 uschar * temp = argrest + Ustrlen(argrest) - 1;
2742 while (temp >= argrest && isspace(*temp)) temp--;
2743 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2744 allow_domain_literals = TRUE;
2745 strip_trailing_dot = TRUE;
2747 allow_utf8_domains = TRUE;
2749 if (!(sender_address = parse_extract_address(argrest, &errmess,
2750 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2751 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2753 sender_address = string_copy_taint(sender_address, TRUE);
2755 message_smtputf8 = string_is_utf8(sender_address);
2756 allow_utf8_domains = FALSE;
2758 allow_domain_literals = FALSE;
2759 strip_trailing_dot = FALSE;
2761 f.sender_address_forced = TRUE;
2765 /* -G: sendmail invocation to specify that it's a gateway submission and
2766 sendmail may complain about problems instead of fixing them.
2767 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2768 not at this time complain about problems. */
2774 /* -h: Set the hop count for an incoming message. Exim does not currently
2775 support this; it always computes it by counting the Received: headers.
2776 To put it in will require a change to the spool header file format. */
2780 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2781 if (!isdigit(*argrest)) badarg = TRUE;
2785 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2786 not to be documented for sendmail but mailx (at least) uses it) */
2789 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2793 /* -L: set the identifier used for syslog; equivalent to setting
2794 syslog_processname in the config file, but needs to be an admin option. */
2798 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2799 if ((sz = Ustrlen(argrest)) > 32)
2800 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2802 exim_fail("exim: the -L syslog name is too short\n");
2803 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2807 receiving_message = FALSE;
2809 /* -MC: continue delivery of another message via an existing open
2810 file descriptor. This option is used for an internal call by the
2811 smtp transport when there is a pending message waiting to go to an
2812 address to which it has got a connection. Five subsequent arguments are
2813 required: transport name, host name, IP address, sequence number, and
2814 message_id. Transports may decline to create new processes if the sequence
2815 number gets too big. The channel is stdin. This (-MC) must be the last
2816 argument. There's a subsequent check that the real-uid is privileged.
2818 If we are running in the test harness. delay for a bit, to let the process
2819 that set this one up complete. This makes for repeatability of the logging,
2822 if (Ustrcmp(argrest, "C") == 0)
2824 union sockaddr_46 interface_sock;
2825 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2828 exim_fail("exim: too many or too few arguments after -MC\n");
2830 if (msg_action_arg >= 0)
2831 exim_fail("exim: incompatible arguments\n");
2833 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2834 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2835 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2836 continue_sequence = Uatoi(argv[++i]);
2837 msg_action = MSG_DELIVER;
2838 msg_action_arg = ++i;
2839 forced_delivery = TRUE;
2840 queue_run_pid = passed_qr_pid;
2841 queue_run_pipe = passed_qr_pipe;
2843 if (!mac_ismsgid(argv[i]))
2844 exim_fail("exim: malformed message id %s after -MC option\n",
2847 /* Set up $sending_ip_address and $sending_port, unless proxied */
2849 if (!continue_proxy_cipher)
2850 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2852 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2855 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2858 testharness_pause_ms(500);
2862 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2866 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2867 precedes -MC (see above). The flag indicates that the host to which
2868 Exim is connected has accepted an AUTH sequence. */
2870 case 'A': f.smtp_authenticated = TRUE; break;
2872 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2873 that exim is connected to supports the esmtp extension DSN */
2875 case 'D': smtp_peer_options |= OPTION_DSN; break;
2877 /* -MCd: for debug, set a process-purpose string */
2879 case 'd': if (++i < argc)
2880 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2884 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2885 from the commandline should be tainted - but we will need an untainted
2886 value for the spoolfile when doing a -odi delivery process. */
2888 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2892 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2894 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2896 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2897 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2898 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2900 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2902 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2907 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2908 it preceded -MC (see above) */
2910 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2912 #ifdef SUPPORT_SOCKS
2913 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2914 case 'p': proxy_session = TRUE;
2917 proxy_local_address = string_copy_taint(argv[i], TRUE);
2920 proxy_local_port = Uatoi(argv[i]);
2923 proxy_external_address = string_copy_taint(argv[i], TRUE);
2926 proxy_external_port = Uatoi(argv[i]);
2932 /* -MCQ: pass on the pid of the queue-running process that started
2933 this chain of deliveries and the fd of its synchronizing pipe; this
2934 is useful only when it precedes -MC (see above) */
2936 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2938 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2942 /* -MCq: do a quota check on the given recipient for the given size
2943 of message. Separate from -MC. */
2944 case 'q': rcpt_verify_quota = TRUE;
2945 if (++i < argc) message_size = Uatoi(argv[i]);
2949 /* -MCS: set the smtp_use_size flag; this is useful only when it
2950 precedes -MC (see above) */
2952 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2955 /* -MCs: used with -MCt; SNI was sent */
2956 /* -MCr: ditto, DANE */
2959 case 's': if (++i < argc)
2961 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
2962 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
2967 /* -MCt: similar to -MCT below but the connection is still open
2968 via a proxy process which handles the TLS context and coding.
2969 Require three arguments for the proxied local address and port,
2970 and the TLS cipher. */
2972 case 't': if (++i < argc)
2973 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
2976 sending_port = (int)(Uatol(argv[i]));
2979 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
2983 /* -MCT: set the tls_offered flag; this is useful only when it
2984 precedes -MC (see above). The flag indicates that the host to which
2985 Exim is connected has offered TLS support. */
2987 case 'T': smtp_peer_options |= OPTION_TLS; break;
2990 default: badarg = TRUE; break;
2995 /* -M[x]: various operations on the following list of message ids:
2996 -M deliver the messages, ignoring next retry times and thawing
2997 -Mc deliver the messages, checking next retry times, no thawing
2998 -Mf freeze the messages
2999 -Mg give up on the messages
3000 -Mt thaw the messages
3001 -Mrm remove the messages
3002 In the above cases, this must be the last option. There are also the
3003 following options which are followed by a single message id, and which
3004 act on that message. Some of them use the "recipient" addresses as well.
3005 -Mar add recipient(s)
3006 -MG move to a different queue
3007 -Mmad mark all recipients delivered
3008 -Mmd mark recipients(s) delivered
3010 -Mset load a message for use with -be
3012 -Mvc show copy (of whole message, in RFC 2822 format)
3019 msg_action = MSG_DELIVER;
3020 forced_delivery = f.deliver_force_thaw = TRUE;
3022 else if (Ustrcmp(argrest, "ar") == 0)
3024 msg_action = MSG_ADD_RECIPIENT;
3025 one_msg_action = TRUE;
3027 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3028 else if (Ustrcmp(argrest, "es") == 0)
3030 msg_action = MSG_EDIT_SENDER;
3031 one_msg_action = TRUE;
3033 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3034 else if (Ustrcmp(argrest, "g") == 0)
3036 msg_action = MSG_DELIVER;
3037 deliver_give_up = TRUE;
3039 else if (Ustrcmp(argrest, "G") == 0)
3041 msg_action = MSG_SETQUEUE;
3042 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
3044 else if (Ustrcmp(argrest, "mad") == 0)
3046 msg_action = MSG_MARK_ALL_DELIVERED;
3048 else if (Ustrcmp(argrest, "md") == 0)
3050 msg_action = MSG_MARK_DELIVERED;
3051 one_msg_action = TRUE;
3053 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3054 else if (Ustrcmp(argrest, "set") == 0)
3056 msg_action = MSG_LOAD;
3057 one_msg_action = TRUE;
3059 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3060 else if (Ustrcmp(argrest, "vb") == 0)
3062 msg_action = MSG_SHOW_BODY;
3063 one_msg_action = TRUE;
3065 else if (Ustrcmp(argrest, "vc") == 0)
3067 msg_action = MSG_SHOW_COPY;
3068 one_msg_action = TRUE;
3070 else if (Ustrcmp(argrest, "vh") == 0)
3072 msg_action = MSG_SHOW_HEADER;
3073 one_msg_action = TRUE;
3075 else if (Ustrcmp(argrest, "vl") == 0)
3077 msg_action = MSG_SHOW_LOG;
3078 one_msg_action = TRUE;
3080 else { badarg = TRUE; break; }
3082 /* All the -Mxx options require at least one message id. */
3084 msg_action_arg = i + 1;
3085 if (msg_action_arg >= argc)
3086 exim_fail("exim: no message ids given after %s option\n", arg);
3088 /* Some require only message ids to follow */
3090 if (!one_msg_action)
3092 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3093 exim_fail("exim: malformed message id %s after %s option\n",
3095 goto END_ARG; /* Remaining args are ids */
3098 /* Others require only one message id, possibly followed by addresses,
3099 which will be handled as normal arguments. */
3103 if (!mac_ismsgid(argv[msg_action_arg]))
3104 exim_fail("exim: malformed message id %s after %s option\n",
3105 argv[msg_action_arg], arg);
3111 /* Some programs seem to call the -om option without the leading o;
3112 for sendmail it askes for "me too". Exim always does this. */
3115 if (*argrest) badarg = TRUE;
3119 /* -N: don't do delivery - a debugging option that stops transports doing
3120 their thing. It implies debugging at the D_v level. */
3125 f.dont_deliver = TRUE;
3126 debug_selector |= D_v;
3127 debug_file = stderr;
3133 /* -n: This means "don't alias" in sendmail, apparently.
3134 For normal invocations, it has no effect.
3135 It may affect some other options. */
3141 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3142 option to the specified value. This form uses long names. We need to handle
3143 -O option=value and -Ooption=value. */
3148 exim_fail("exim: string expected after -O\n");
3154 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3157 if (!*(alias_arg = argrest))
3158 if (i+1 < argc) alias_arg = argv[++i];
3159 else exim_fail("exim: string expected after -oA\n");
3162 /* -oB: Set a connection message max value for remote deliveries */
3165 uschar * p = argrest;
3167 if (i+1 < argc && isdigit((argv[i+1][0])))
3171 connection_max_messages = 1;
3178 exim_fail("exim: number expected after -oB\n");
3179 connection_max_messages = Uatoi(p);
3184 /* -odb: background delivery */
3187 if (Ustrcmp(argrest, "b") == 0)
3189 f.synchronous_delivery = FALSE;
3190 arg_queue_only = FALSE;
3191 queue_only_set = TRUE;
3194 /* -odd: testsuite-only: add no inter-process delays */
3196 else if (Ustrcmp(argrest, "d") == 0)
3197 f.testsuite_delays = FALSE;
3199 /* -odf: foreground delivery (smail-compatible option); same effect as
3200 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3203 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3205 f.synchronous_delivery = TRUE;
3206 arg_queue_only = FALSE;
3207 queue_only_set = TRUE;
3210 /* -odq: queue only */
3212 else if (Ustrcmp(argrest, "q") == 0)
3214 f.synchronous_delivery = FALSE;
3215 arg_queue_only = TRUE;
3216 queue_only_set = TRUE;
3219 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3220 but no remote delivery */
3222 else if (Ustrcmp(argrest, "qs") == 0)
3224 f.queue_smtp = TRUE;
3225 arg_queue_only = FALSE;
3226 queue_only_set = TRUE;
3231 /* -oex: Sendmail error flags. As these are also accepted without the
3232 leading -o prefix, for compatibility with vacation and other callers,
3233 they are handled with -e above. */
3235 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3236 -oitrue: Another sendmail syntax for the same */
3239 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3244 /* -oM*: Set various characteristics for an incoming message; actually
3245 acted on for trusted callers only. */
3250 exim_fail("exim: data expected after -oM%s\n", argrest);
3252 /* -oMa: Set sender host address */
3254 if (Ustrcmp(argrest, "a") == 0)
3255 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3257 /* -oMaa: Set authenticator name */
3259 else if (Ustrcmp(argrest, "aa") == 0)
3260 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3262 /* -oMas: setting authenticated sender */
3264 else if (Ustrcmp(argrest, "as") == 0)
3265 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3267 /* -oMai: setting authenticated id */
3269 else if (Ustrcmp(argrest, "ai") == 0)
3270 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3272 /* -oMi: Set incoming interface address */
3274 else if (Ustrcmp(argrest, "i") == 0)
3275 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3277 /* -oMm: Message reference */
3279 else if (Ustrcmp(argrest, "m") == 0)
3281 if (!mac_ismsgid(argv[i+1]))
3282 exim_fail("-oMm must be a valid message ID\n");
3283 if (!f.trusted_config)
3284 exim_fail("-oMm must be called by a trusted user/config\n");
3285 message_reference = argv[++i];
3288 /* -oMr: Received protocol */
3290 else if (Ustrcmp(argrest, "r") == 0)
3292 if (received_protocol)
3293 exim_fail("received_protocol is set already\n");
3295 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3297 /* -oMs: Set sender host name */
3299 else if (Ustrcmp(argrest, "s") == 0)
3300 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3302 /* -oMt: Set sender ident */
3304 else if (Ustrcmp(argrest, "t") == 0)
3306 sender_ident_set = TRUE;
3307 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3310 /* Else a bad argument */
3317 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3318 seem to call this as -m (undocumented), so that is also accepted (see
3320 /* -oo: An ancient flag for old-style addresses which still seems to
3321 crop up in some calls (see in SCO). */
3325 if (*argrest) badarg = TRUE;
3328 /* -oP <name>: set pid file path for daemon
3329 -oPX: delete pid file of daemon */
3332 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3333 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3334 "(uid=%d euid=%d | %d)\n",
3335 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3336 if (!*argrest) override_pid_file_path = argv[++i];
3337 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3342 /* -or <n>: set timeout for non-SMTP acceptance
3343 -os <n>: set timeout for SMTP acceptance */
3348 int * tp = argrest[-1] == 'r'
3349 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3351 *tp = readconf_readtime(argrest, 0, FALSE);
3352 else if (i+1 < argc)
3353 *tp = readconf_readtime(argv[++i], 0, FALSE);
3356 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3360 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3361 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3364 if (*argrest) badarg = TRUE;
3365 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3368 /* -oY: Override creation of daemon notifier socket */
3371 if (*argrest) badarg = TRUE;
3372 else notifier_socket = NULL;
3375 /* Unknown -o argument */
3383 /* -ps: force Perl startup; -pd force delayed Perl startup */
3387 if (*argrest == 's' && argrest[1] == 0)
3389 perl_start_option = 1;
3392 if (*argrest == 'd' && argrest[1] == 0)
3394 perl_start_option = -1;
3399 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3400 which sets the host protocol and host name */
3403 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3407 uschar * hn = Ustrchr(argrest, ':');
3409 if (received_protocol)
3410 exim_fail("received_protocol is set already\n");
3413 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3416 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3417 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3418 sender_host_name = string_copy_taint(hn + 1, TRUE);
3425 receiving_message = FALSE;
3426 if (queue_interval >= 0)
3427 exim_fail("exim: -q specified more than once\n");
3429 /* -qq...: Do queue runs in a 2-stage manner */
3431 if (*argrest == 'q')
3433 f.queue_2stage = TRUE;
3437 /* -qi...: Do only first (initial) deliveries */
3439 if (*argrest == 'i')
3441 f.queue_run_first_delivery = TRUE;
3445 /* -qf...: Run the queue, forcing deliveries
3446 -qff..: Ditto, forcing thawing as well */
3448 if (*argrest == 'f')
3450 f.queue_run_force = TRUE;
3451 if (*++argrest == 'f')
3453 f.deliver_force_thaw = TRUE;
3458 /* -q[f][f]l...: Run the queue only on local deliveries */
3460 if (*argrest == 'l')
3462 f.queue_run_local = TRUE;
3466 /* -q[f][f][l][G<name>]... Work on the named queue */
3468 if (*argrest == 'G')
3471 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3472 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3473 queue_name = string_copyn(argrest, i);
3475 if (*argrest == '/') argrest++;
3478 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3479 only, optionally named, optionally starting from a given message id. */
3481 if (!(list_queue || count_queue))
3483 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3486 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3487 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3488 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3489 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3492 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3493 forced, optionally local only, optionally named. */
3495 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3497 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3501 case 'R': /* Synonymous with -qR... */
3503 const uschar *tainted_selectstr;
3505 receiving_message = FALSE;
3507 /* -Rf: As -R (below) but force all deliveries,
3508 -Rff: Ditto, but also thaw all frozen messages,
3509 -Rr: String is regex
3510 -Rrf: Regex and force
3511 -Rrff: Regex and force and thaw
3513 in all cases provided there are no further characters in this
3517 for (int i = 0; i < nelem(rsopts); i++)
3518 if (Ustrcmp(argrest, rsopts[i]) == 0)
3520 if (i != 2) f.queue_run_force = TRUE;
3521 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3522 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3523 argrest += Ustrlen(rsopts[i]);
3526 /* -R: Set string to match in addresses for forced queue run to
3527 pick out particular messages. */
3529 /* Avoid attacks from people providing very long strings, and do so before
3532 tainted_selectstr = argrest;
3533 else if (i+1 < argc)
3534 tainted_selectstr = argv[++i];
3536 exim_fail("exim: string expected after -R\n");
3537 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3541 /* -r: an obsolete synonym for -f (see above) */
3544 /* -S: Like -R but works on sender. */
3546 case 'S': /* Synonymous with -qS... */
3548 const uschar *tainted_selectstr;
3550 receiving_message = FALSE;
3552 /* -Sf: As -S (below) but force all deliveries,
3553 -Sff: Ditto, but also thaw all frozen messages,
3554 -Sr: String is regex
3555 -Srf: Regex and force
3556 -Srff: Regex and force and thaw
3558 in all cases provided there are no further characters in this
3562 for (int i = 0; i < nelem(rsopts); i++)
3563 if (Ustrcmp(argrest, rsopts[i]) == 0)
3565 if (i != 2) f.queue_run_force = TRUE;
3566 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3567 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3568 argrest += Ustrlen(rsopts[i]);
3571 /* -S: Set string to match in addresses for forced queue run to
3572 pick out particular messages. */
3575 tainted_selectstr = argrest;
3576 else if (i+1 < argc)
3577 tainted_selectstr = argv[++i];
3579 exim_fail("exim: string expected after -S\n");
3580 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3584 /* -Tqt is an option that is exclusively for use by the testing suite.
3585 It is not recognized in other circumstances. It allows for the setting up
3586 of explicit "queue times" so that various warning/retry things can be
3587 tested. Otherwise variability of clock ticks etc. cause problems. */
3590 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3591 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3596 /* -t: Set flag to extract recipients from body of message. */
3599 if (!*argrest) extract_recipients = TRUE;
3601 /* -ti: Set flag to extract recipients from body of message, and also
3602 specify that dot does not end the message. */
3604 else if (Ustrcmp(argrest, "i") == 0)
3606 extract_recipients = TRUE;
3610 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3613 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3620 /* -U: This means "initial user submission" in sendmail, apparently. The
3621 doc claims that in future sendmail may refuse syntactically invalid
3622 messages instead of fixing them. For the moment, we just ignore it. */
3628 /* -v: verify things - this is a very low-level debugging */
3633 debug_selector |= D_v;
3634 debug_file = stderr;
3640 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3642 The -x flag tells the sendmail command that mail from a local
3643 mail program has National Language Support (NLS) extended characters
3644 in the body of the mail item. The sendmail command can send mail with
3645 extended NLS characters across networks that normally corrupts these
3648 As Exim is 8-bit clean, it just ignores this flag. */
3651 if (*argrest) badarg = TRUE;
3654 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3655 logs to that file. We swallow the parameter and otherwise ignore it. */
3660 exim_fail("exim: string expected after -X\n");
3663 /* -z: a line of text to log */
3668 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3670 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3673 /* All other initial characters are errors */
3678 } /* End of high-level switch statement */
3680 /* Failed to recognize the option, or syntax error */
3683 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3684 "option %s\n", arg);
3688 /* If -R or -S have been specified without -q, assume a single queue run. */
3690 if ( (deliver_selectstring || deliver_selectstring_sender)
3691 && queue_interval < 0)
3696 store_pool = old_pool;
3699 /* If usage_wanted is set we call the usage function - which never returns */
3700 if (usage_wanted) exim_usage(called_as);
3702 /* Arguments have been processed. Check for incompatibilities. */
3703 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3704 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3705 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3706 || filter_test != FTEST_NONE
3707 || msg_action_arg > 0 && !one_msg_action
3709 || ( msg_action_arg > 0
3710 && ( f.daemon_listen || queue_interval > 0 || list_options
3711 || checking && msg_action != MSG_LOAD
3712 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3714 || ( (f.daemon_listen || queue_interval > 0)
3715 && ( sender_address || list_options || list_queue || checking
3718 || f.daemon_listen && queue_interval == 0
3719 || f.inetd_wait_mode && queue_interval >= 0
3721 && ( checking || smtp_input || extract_recipients
3722 || filter_test != FTEST_NONE || bi_option
3724 || ( verify_address_mode
3725 && ( f.address_test_mode || smtp_input || extract_recipients
3726 || filter_test != FTEST_NONE || bi_option
3728 || ( f.address_test_mode
3729 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3733 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3735 || deliver_selectstring && queue_interval < 0
3736 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3738 exim_fail("exim: incompatible command-line options or arguments\n");
3740 /* If debugging is set up, set the file and the file descriptor to pass on to
3741 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3742 to run in the foreground. */
3744 if (debug_selector != 0)
3746 debug_file = stderr;
3747 debug_fd = fileno(debug_file);
3748 f.background_daemon = FALSE;
3749 testharness_pause_ms(100); /* lets caller finish */
3750 if (debug_selector != D_v) /* -v only doesn't show this */
3752 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3753 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3755 if (!version_printed)
3756 show_whats_supported(stderr);
3760 /* When started with root privilege, ensure that the limits on the number of
3761 open files and the number of processes (where that is accessible) are
3762 sufficiently large, or are unset, in case Exim has been called from an
3763 environment where the limits are screwed down. Not all OS have the ability to
3764 change some of these limits. */
3768 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3774 #ifdef RLIMIT_NOFILE
3775 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3777 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3779 rlp.rlim_cur = rlp.rlim_max = 0;
3782 /* I originally chose 1000 as a nice big number that was unlikely to
3783 be exceeded. It turns out that some older OS have a fixed upper limit of
3786 if (rlp.rlim_cur < 1000)
3788 rlp.rlim_cur = rlp.rlim_max = 1000;
3789 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3791 rlp.rlim_cur = rlp.rlim_max = 256;
3792 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3793 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3800 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3802 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3804 rlp.rlim_cur = rlp.rlim_max = 0;
3807 # ifdef RLIM_INFINITY
3808 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3810 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3812 if (rlp.rlim_cur < 1000)
3814 rlp.rlim_cur = rlp.rlim_max = 1000;
3816 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3817 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3823 /* Exim is normally entered as root (but some special configurations are
3824 possible that don't do this). However, it always spins off sub-processes that
3825 set their uid and gid as required for local delivery. We don't want to pass on
3826 any extra groups that root may belong to, so we want to get rid of them all at
3829 We need to obey setgroups() at this stage, before possibly giving up root
3830 privilege for a changed configuration file, but later on we might need to
3831 check on the additional groups for the admin user privilege - can't do that
3832 till after reading the config, which might specify the exim gid. Therefore,
3833 save the group list here first. */
3835 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3836 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3838 /* There is a fundamental difference in some BSD systems in the matter of
3839 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3840 known not to be different. On the "different" systems there is a single group
3841 list, and the first entry in it is the current group. On all other versions of
3842 Unix there is a supplementary group list, which is in *addition* to the current
3843 group. Consequently, to get rid of all extraneous groups on a "standard" system
3844 you pass over 0 groups to setgroups(), while on a "different" system you pass
3845 over a single group - the current group, which is always the first group in the
3846 list. Calling setgroups() with zero groups on a "different" system results in
3847 an error return. The following code should cope with both types of system.
3849 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3850 the "setgroups() with zero groups" - and changes the egid.
3851 Thanks to that we had to stash the original_egid above, for use below
3852 in the call to exim_setugid().
3854 However, if this process isn't running as root, setgroups() can't be used
3855 since you have to be root to run it, even if throwing away groups.
3856 Except, sigh, for Hurd - where you can.
3857 Not being root here happens only in some unusual configurations. */
3860 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3861 && setgroups(0, NULL) != 0
3863 && setgroups(1, group_list) != 0)
3864 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3866 /* If the configuration file name has been altered by an argument on the
3867 command line (either a new file name or a macro definition) and the caller is
3868 not root, or if this is a filter testing run, remove any setuid privilege the
3869 program has and run as the underlying user.
3871 The exim user is locked out of this, which severely restricts the use of -C
3874 Otherwise, set the real ids to the effective values (should be root unless run
3875 from inetd, which it can either be root or the exim uid, if one is configured).
3877 There is a private mechanism for bypassing some of this, in order to make it
3878 possible to test lots of configurations automatically, without having either to
3879 recompile each time, or to patch in an actual configuration file name and other
3880 values (such as the path name). If running in the test harness, pretend that
3881 configuration file changes and macro definitions haven't happened. */
3884 (!f.trusted_config || /* Config changed, or */
3885 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3886 real_uid != root_uid && /* Not root, and */
3887 !f.running_in_test_harness /* Not fudged */
3889 expansion_test /* expansion testing */
3891 filter_test != FTEST_NONE) /* Filter testing */
3893 setgroups(group_count, group_list);
3894 exim_setugid(real_uid, real_gid, FALSE,
3895 US"-C, -D, -be or -bf forces real uid");
3896 removed_privilege = TRUE;
3898 /* In the normal case when Exim is called like this, stderr is available
3899 and should be used for any logging information because attempts to write
3900 to the log will usually fail. To arrange this, we unset really_exim. However,
3901 if no stderr is available there is no point - we might as well have a go
3902 at the log (if it fails, syslog will be written).
3904 Note that if the invoker is Exim, the logs remain available. Messing with
3905 this causes unlogged successful deliveries. */
3907 if (log_stderr && real_uid != exim_uid)
3908 f.really_exim = FALSE;
3911 /* Privilege is to be retained for the moment. It may be dropped later,
3912 depending on the job that this Exim process has been asked to do. For now, set
3913 the real uid to the effective so that subsequent re-execs of Exim are done by a
3917 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3919 /* If testing a filter, open the file(s) now, before wasting time doing other
3920 setups and reading the message. */
3922 if (filter_test & FTEST_SYSTEM)
3923 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3924 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3927 if (filter_test & FTEST_USER)
3928 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3929 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3932 /* Initialise lookup_list
3933 If debugging, already called above via version reporting.
3934 In either case, we initialise the list of available lookups while running
3935 as root. All dynamically modules are loaded from a directory which is
3936 hard-coded into the binary and is code which, if not a module, would be
3937 part of Exim already. Ability to modify the content of the directory
3938 is equivalent to the ability to modify a setuid binary!
3940 This needs to happen before we read the main configuration. */
3943 /*XXX this excrescence could move to the testsuite standard config setup file */
3945 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3948 /* Read the main runtime configuration data; this gives up if there
3949 is a failure. It leaves the configuration file open so that the subsequent
3950 configuration data for delivery can be read if needed.
3952 NOTE: immediately after opening the configuration file we change the working
3953 directory to "/"! Later we change to $spool_directory. We do it there, because
3954 during readconf_main() some expansion takes place already. */
3956 /* Store the initial cwd before we change directories. Can be NULL if the
3957 dir has already been unlinked. */
3958 initial_cwd = os_getcwd(NULL, 0);
3959 if (!initial_cwd && errno)
3960 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
3962 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
3963 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
3966 -be[m] expansion test -
3967 -b[fF] filter test new
3969 -bmalware malware_test_file new
3971 -brw rewrite test new
3973 -bv[s] address verify -
3975 -bP <option> (except -bP config, which sets list_config)
3977 If any of these options is set, we suppress warnings about configuration
3978 issues (currently about tls_advertise_hosts and keep_environment not being
3982 int old_pool = store_pool;
3983 #ifdef MEASURE_TIMING
3984 struct timeval t0, diff;
3985 (void)gettimeofday(&t0, NULL);
3988 store_pool = POOL_CONFIG;
3989 readconf_main(checking || list_options);
3990 store_pool = old_pool;
3992 #ifdef MEASURE_TIMING
3993 report_time_since(&t0, US"readconf_main (delta)");
3997 /* Now in directory "/" */
3999 if (cleanup_environment() == FALSE)
4000 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4003 /* If an action on specific messages is requested, or if a daemon or queue
4004 runner is being started, we need to know if Exim was called by an admin user.
4005 This is the case if the real user is root or exim, or if the real group is
4006 exim, or if one of the supplementary groups is exim or a group listed in
4007 admin_groups. We don't fail all message actions immediately if not admin_user,
4008 since some actions can be performed by non-admin users. Instead, set admin_user
4009 for later interrogation. */
4011 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4012 f.admin_user = TRUE;
4014 for (int i = 0; i < group_count && !f.admin_user; i++)
4015 if (group_list[i] == exim_gid)
4016 f.admin_user = TRUE;
4017 else if (admin_groups)
4018 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4019 if (admin_groups[j] == group_list[i])
4020 f.admin_user = TRUE;
4022 /* Another group of privileged users are the trusted users. These are root,
4023 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4024 are permitted to specify sender_addresses with -f on the command line, and
4025 other message parameters as well. */
4027 if (real_uid == root_uid || real_uid == exim_uid)
4028 f.trusted_caller = TRUE;
4032 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4033 if (trusted_users[i] == real_uid)
4034 f.trusted_caller = TRUE;
4037 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4038 if (trusted_groups[i] == real_gid)
4039 f.trusted_caller = TRUE;
4040 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4041 if (trusted_groups[i] == group_list[j])
4042 f.trusted_caller = TRUE;
4045 /* At this point, we know if the user is privileged and some command-line
4046 options become possibly impermissible, depending upon the configuration file. */
4048 if (checking && commandline_checks_require_admin && !f.admin_user)
4049 exim_fail("exim: those command-line flags are set to require admin\n");
4051 /* Handle the decoding of logging options. */
4053 decode_bits(log_selector, log_selector_size, log_notall,
4054 log_selector_string, log_options, log_options_count, US"log", 0);
4058 debug_printf("configuration file is %s\n", config_main_filename);
4059 debug_printf("log selectors =");
4060 for (int i = 0; i < log_selector_size; i++)
4061 debug_printf(" %08x", log_selector[i]);
4065 /* If domain literals are not allowed, check the sender address that was
4066 supplied with -f. Ditto for a stripped trailing dot. */
4070 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4071 exim_fail("exim: bad -f address \"%s\": domain literals not "
4072 "allowed\n", sender_address);
4073 if (f_end_dot && !strip_trailing_dot)
4074 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4075 "(trailing dot not allowed)\n", sender_address);
4078 /* See if an admin user overrode our logging. */
4080 if (cmdline_syslog_name)
4083 syslog_processname = cmdline_syslog_name;
4084 log_file_path = string_copy(CUS"syslog");
4087 /* not a panic, non-privileged users should not be able to spam paniclog */
4089 "exim: you lack sufficient privilege to specify syslog process name\n");
4091 /* Paranoia check of maximum lengths of certain strings. There is a check
4092 on the length of the log file path in log.c, which will come into effect
4093 if there are any calls to write the log earlier than this. However, if we
4094 get this far but the string is very long, it is better to stop now than to
4095 carry on and (e.g.) receive a message and then have to collapse. The call to
4096 log_write() from here will cause the ultimate panic collapse if the complete
4097 file name exceeds the buffer length. */
4099 if (Ustrlen(log_file_path) > 200)
4100 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4101 "log_file_path is longer than 200 chars: aborting");
4103 if (Ustrlen(pid_file_path) > 200)
4104 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4105 "pid_file_path is longer than 200 chars: aborting");
4107 if (Ustrlen(spool_directory) > 200)
4108 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4109 "spool_directory is longer than 200 chars: aborting");
4111 /* Length check on the process name given to syslog for its TAG field,
4112 which is only permitted to be 32 characters or less. See RFC 3164. */
4114 if (Ustrlen(syslog_processname) > 32)
4115 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4116 "syslog_processname is longer than 32 chars: aborting");
4121 log_write(0, LOG_MAIN, "%s", log_oneline);
4122 return EXIT_SUCCESS;
4125 return EXIT_FAILURE;
4127 /* In some operating systems, the environment variable TMPDIR controls where
4128 temporary files are created; Exim doesn't use these (apart from when delivering
4129 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4130 If TMPDIR is found in the environment, reset it to the value defined in the
4131 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4132 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4133 EXIM_TMPDIR by the build scripts.
4137 if (environ) for (uschar ** p = USS environ; *p; p++)
4138 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4140 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4141 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4143 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4147 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4148 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4149 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4150 called by a user who has set the TZ variable. This then affects the timestamps
4151 in log files and in Received: headers, and any created Date: header lines. The
4152 required timezone is settable in the configuration file, so nothing can be done
4153 about this earlier - but hopefully nothing will normally be logged earlier than
4154 this. We have to make a new environment if TZ is wrong, but don't bother if
4155 timestamps_utc is set, because then all times are in UTC anyway. */
4157 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4158 f.timestamps_utc = TRUE;
4161 uschar *envtz = US getenv("TZ");
4163 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4164 : timezone_string != NULL
4167 uschar **p = USS environ;
4171 if (environ) while (*p++) count++;
4172 if (!envtz) count++;
4173 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4174 if (environ) for (p = USS environ; *p; p++)
4175 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4176 if (timezone_string)
4178 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4179 sprintf(CS *newp++, "TZ=%s", timezone_string);
4184 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4185 tod_stamp(tod_log));
4189 /* Handle the case when we have removed the setuid privilege because of -C or
4190 -D. This means that the caller of Exim was not root.
4192 There is a problem if we were running as the Exim user. The sysadmin may
4193 expect this case to retain privilege because "the binary was called by the
4194 Exim user", but it hasn't, because either the -D option set macros, or the
4195 -C option set a non-trusted configuration file. There are two possibilities:
4197 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4198 to do message deliveries. Thus, the fact that it is running as a
4199 non-privileged user is plausible, and might be wanted in some special
4200 configurations. However, really_exim will have been set false when
4201 privilege was dropped, to stop Exim trying to write to its normal log
4202 files. Therefore, re-enable normal log processing, assuming the sysadmin
4203 has set up the log directory correctly.
4205 (2) If deliver_drop_privilege is not set, the configuration won't work as
4206 apparently intended, and so we log a panic message. In order to retain
4207 root for -C or -D, the caller must either be root or be invoking a
4208 trusted configuration file (when deliver_drop_privilege is false). */
4210 if ( removed_privilege
4211 && (!f.trusted_config || opt_D_used)
4212 && real_uid == exim_uid)
4213 if (deliver_drop_privilege)
4214 f.really_exim = TRUE; /* let logging work normally */
4216 log_write(0, LOG_MAIN|LOG_PANIC,
4217 "exim user lost privilege for using %s option",
4218 f.trusted_config? "-D" : "-C");
4220 /* Start up Perl interpreter if Perl support is configured and there is a
4221 perl_startup option, and the configuration or the command line specifies
4222 initializing starting. Note that the global variables are actually called
4223 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4226 if (perl_start_option != 0)
4227 opt_perl_at_start = (perl_start_option > 0);
4228 if (opt_perl_at_start && opt_perl_startup != NULL)
4231 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4232 if ((errstr = init_perl(opt_perl_startup)))
4233 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4234 opt_perl_started = TRUE;
4236 #endif /* EXIM_PERL */
4238 /* Log the arguments of the call if the configuration file said so. This is
4239 a debugging feature for finding out what arguments certain MUAs actually use.
4240 Don't attempt it if logging is disabled, or if listing variables or if
4241 verifying/testing addresses or expansions. */
4243 if ( (debug_selector & D_any || LOGGING(arguments))
4244 && f.really_exim && !list_options && !checking)
4246 uschar *p = big_buffer;
4247 Ustrcpy(p, US"cwd= (failed)");
4254 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4255 p += Ustrlen(CCS p);
4258 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4260 for (int i = 0; i < argc; i++)
4262 int len = Ustrlen(argv[i]);
4263 const uschar *printing;
4265 if (p + len + 8 >= big_buffer + big_buffer_size)
4267 Ustrcpy(p, US" ...");
4268 log_write(0, LOG_MAIN, "%s", big_buffer);
4269 Ustrcpy(big_buffer, US"...");
4272 printing = string_printing(argv[i]);
4273 if (!*printing) quote = US"\"";
4276 const uschar *pp = printing;
4278 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4280 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4281 (p - big_buffer) - 4), printing, quote);
4284 if (LOGGING(arguments))
4285 log_write(0, LOG_MAIN, "%s", big_buffer);
4287 debug_printf("%s\n", big_buffer);
4290 /* Set the working directory to be the top-level spool directory. We don't rely
4291 on this in the code, which always uses fully qualified names, but it's useful
4292 for core dumps etc. Don't complain if it fails - the spool directory might not
4293 be generally accessible and calls with the -C option (and others) have lost
4294 privilege by now. Before the chdir, we try to ensure that the directory exists.
4297 if (Uchdir(spool_directory) != 0)
4299 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4300 (void) Uchdir(spool_directory);
4303 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4304 alias file. Exim doesn't have such a concept, but this call is screwed into
4305 Sun's YP makefiles. Handle this by calling a configured script, as the real
4306 user who called Exim. The -oA option can be used to pass an argument to the
4311 (void) fclose(config_file);
4312 if (bi_command && *bi_command)
4316 argv[i++] = bi_command;
4317 if (alias_arg) argv[i++] = alias_arg;
4320 setgroups(group_count, group_list);
4321 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4323 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4324 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4326 execv(CS argv[0], (char *const *)argv);
4327 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4331 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4336 /* We moved the admin/trusted check to be immediately after reading the
4337 configuration file. We leave these prints here to ensure that syslog setup,
4338 logfile setup, and so on has already happened. */
4340 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4341 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4343 /* Only an admin user may start the daemon or force a queue run in the default
4344 configuration, but the queue run restriction can be relaxed. Only an admin
4345 user may request that a message be returned to its sender forthwith. Only an
4346 admin user may specify a debug level greater than D_v (because it might show
4347 passwords, etc. in lookup queries). Only an admin user may request a queue
4348 count. Only an admin user can use the test interface to scan for email
4349 (because Exim will be in the spool dir and able to look at mails). */
4353 BOOL debugset = (debug_selector & ~D_v) != 0;
4354 if ( deliver_give_up || f.daemon_listen || malware_test_file
4355 || count_queue && queue_list_requires_admin
4356 || list_queue && queue_list_requires_admin
4357 || queue_interval >= 0 && prod_requires_admin
4358 || queue_name_dest && prod_requires_admin
4359 || debugset && !f.running_in_test_harness
4361 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4364 /* If the real user is not root or the exim uid, the argument for passing
4365 in an open TCP/IP connection for another message is not permitted, nor is
4366 running with the -N option for any delivery action, unless this call to exim is
4367 one that supplied an input message, or we are using a patched exim for
4368 regression testing. */
4370 if ( real_uid != root_uid && real_uid != exim_uid
4371 && ( continue_hostname
4373 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4375 && !f.running_in_test_harness
4377 exim_fail("exim: Permission denied\n");
4379 /* If the caller is not trusted, certain arguments are ignored when running for
4380 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4381 Note that authority for performing certain actions on messages is tested in the
4382 queue_action() function. */
4384 if (!f.trusted_caller && !checking)
4386 sender_host_name = sender_host_address = interface_address =
4387 sender_ident = received_protocol = NULL;
4388 sender_host_port = interface_port = 0;
4389 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4392 /* If a sender host address is set, extract the optional port number off the
4393 end of it and check its syntax. Do the same thing for the interface address.
4394 Exim exits if the syntax is bad. */
4398 if (sender_host_address)
4399 sender_host_port = check_port(sender_host_address);
4400 if (interface_address)
4401 interface_port = check_port(interface_address);
4404 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4407 if (f.trusted_caller)
4409 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4410 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4413 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4416 /* If an SMTP message is being received check to see if the standard input is a
4417 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4418 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4423 union sockaddr_46 inetd_sock;
4424 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4425 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4427 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4428 if (family == AF_INET || family == AF_INET6)
4430 union sockaddr_46 interface_sock;
4431 size = sizeof(interface_sock);
4433 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4434 interface_address = host_ntoa(-1, &interface_sock, NULL,
4437 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4439 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4442 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4443 NULL, &sender_host_port);
4444 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4445 "inetd is not supported when mua_wrapper is set");
4449 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4454 /* If the load average is going to be needed while receiving a message, get it
4455 now for those OS that require the first call to os_getloadavg() to be done as
4456 root. There will be further calls later for each message received. */
4458 #ifdef LOAD_AVG_NEEDS_ROOT
4459 if ( receiving_message
4460 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4461 load_average = OS_GETLOADAVG();
4464 /* The queue_only configuration option can be overridden by -odx on the command
4465 line, except that if queue_only_override is false, queue_only cannot be unset
4466 from the command line. */
4468 if (queue_only_set && (queue_only_override || arg_queue_only))
4469 queue_only = arg_queue_only;
4471 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4474 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4475 if (arg_smtp_receive_timeout >= 0)
4476 smtp_receive_timeout = arg_smtp_receive_timeout;
4478 /* If Exim was started with root privilege, unless we have already removed the
4479 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4480 except when starting the daemon or doing some kind of delivery or address
4481 testing (-bt). These are the only cases when root need to be retained. We run
4482 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4483 retained only for starting the daemon. We always do the initgroups() in this
4484 situation (controlled by the TRUE below), in order to be as close as possible
4485 to the state Exim usually runs in. */
4487 if ( !unprivileged /* originally had root AND */
4488 && !removed_privilege /* still got root AND */
4489 && !f.daemon_listen /* not starting the daemon */
4490 && queue_interval <= 0 /* (either kind of daemon) */
4491 && ( /* AND EITHER */
4492 deliver_drop_privilege /* requested unprivileged */
4494 queue_interval < 0 /* not running the queue */
4495 && ( msg_action_arg < 0 /* and */
4496 || msg_action != MSG_DELIVER /* not delivering */
4498 && (!checking || !f.address_test_mode) /* not address checking */
4499 && !rcpt_verify_quota /* and not quota checking */
4501 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4503 /* When we are retaining a privileged uid, we still change to the exim gid. */
4508 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4509 rv = setgid(exim_gid);
4510 /* Impact of failure is that some stuff might end up with an incorrect group.
4511 We track this for failures from root, since any attempt to change privilege
4512 by root should succeed and failures should be examined. For non-root,
4513 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4514 no need to complain then. */
4516 if (!(unprivileged || removed_privilege))
4517 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4520 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4521 (long int)exim_gid, strerror(errno));
4525 /* Handle a request to scan a file for malware */
4526 if (malware_test_file)
4528 #ifdef WITH_CONTENT_SCAN
4530 set_process_info("scanning file for malware");
4531 if ((result = malware_in_file(malware_test_file)) == FAIL)
4533 printf("No malware found.\n");
4538 printf("Malware lookup returned non-okay/fail: %d\n", result);
4542 printf("Malware found: %s\n", malware_name);
4544 printf("Malware scan detected malware of unknown name.\n");
4546 printf("Malware scanning not enabled at compile time.\n");
4551 /* Handle a request to list the delivery queue */
4555 set_process_info("listing the queue");
4556 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4560 /* Handle a request to count the delivery queue */
4564 set_process_info("counting the queue");
4565 fprintf(stdout, "%u\n", queue_count());
4569 /* Handle actions on specific messages, except for the force delivery and
4570 message load actions, which are done below. Some actions take a whole list of
4571 message ids, which are known to continue up to the end of the arguments. Others
4572 take a single message id and then operate on the recipients list. */
4574 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4576 int yield = EXIT_SUCCESS;
4577 set_process_info("acting on specified messages");
4579 /* ACL definitions may be needed when removing a message (-Mrm) because
4580 event_action gets expanded */
4582 if (msg_action == MSG_REMOVE)
4584 int old_pool = store_pool;
4585 store_pool = POOL_CONFIG;
4587 store_pool = old_pool;
4588 store_writeprotect(POOL_CONFIG);
4591 if (!one_msg_action)
4593 for (i = msg_action_arg; i < argc; i++)
4594 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4595 yield = EXIT_FAILURE;
4598 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4599 default: printf("\n"); break;
4603 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4604 recipients_arg)) yield = EXIT_FAILURE;
4608 /* We used to set up here to skip reading the ACL section, on
4609 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4610 Now, since the intro of the ${acl } expansion, ACL definitions may be
4611 needed in transports so we lost the optimisation. */
4614 int old_pool = store_pool;
4615 #ifdef MEASURE_TIMING
4616 struct timeval t0, diff;
4617 (void)gettimeofday(&t0, NULL);
4620 store_pool = POOL_CONFIG;
4622 store_pool = old_pool;
4624 /* -be can add macro definitions, needing to link to the macro structure
4625 chain. Otherwise, make the memory used for config data readonly. */
4627 if (!expansion_test)
4628 store_writeprotect(POOL_CONFIG);
4630 #ifdef MEASURE_TIMING
4631 report_time_since(&t0, US"readconf_rest (delta)");
4635 /* Handle a request to check quota */
4636 if (rcpt_verify_quota)
4637 if (real_uid != root_uid && real_uid != exim_uid)
4638 exim_fail("exim: Permission denied\n");
4639 else if (recipients_arg >= argc)
4640 exim_fail("exim: missing recipient for quota check\n");
4643 verify_quota(argv[recipients_arg]);
4644 exim_exit(EXIT_SUCCESS);
4647 /* Handle the -brt option. This is for checking out retry configurations.
4648 The next three arguments are a domain name or a complete address, and
4649 optionally two error numbers. All it does is to call the function that
4650 scans the retry configuration data. */
4652 if (test_retry_arg >= 0)
4654 retry_config *yield;
4655 int basic_errno = 0;
4657 const uschar *s1, *s2;
4659 if (test_retry_arg >= argc)
4661 printf("-brt needs a domain or address argument\n");
4662 exim_exit(EXIT_FAILURE);
4664 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4667 /* If the first argument contains no @ and no . it might be a local user
4668 or it might be a single-component name. Treat as a domain. */
4670 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4672 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4673 "being \ntreated as a one-component domain, not as a local part.\n\n",
4677 /* There may be an optional second domain arg. */
4679 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4680 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4682 /* The final arg is an error name */
4684 if (test_retry_arg < argc)
4686 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4688 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4691 printf("%s\n", CS error);
4692 return EXIT_FAILURE;
4695 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4696 code > 100 as an error is for matching codes to the decade. Turn them into
4697 a real error code, off the decade. */
4699 if (basic_errno == ERRNO_MAIL4XX ||
4700 basic_errno == ERRNO_RCPT4XX ||
4701 basic_errno == ERRNO_DATA4XX)
4703 int code = (more_errno >> 8) & 255;
4705 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4706 else if (code > 100)
4707 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4711 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4712 printf("No retry information found\n");
4715 more_errno = yield->more_errno;
4716 printf("Retry rule: %s ", yield->pattern);
4718 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4720 printf("quota%s%s ",
4721 (more_errno > 0)? "_" : "",
4722 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4724 else if (yield->basic_errno == ECONNREFUSED)
4726 printf("refused%s%s ",
4727 (more_errno > 0)? "_" : "",
4728 (more_errno == 'M')? "MX" :
4729 (more_errno == 'A')? "A" : "");
4731 else if (yield->basic_errno == ETIMEDOUT)
4734 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4736 if (more_errno != 0) printf("_%s",
4737 (more_errno == 'M')? "MX" : "A");
4740 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4741 printf("auth_failed ");
4744 for (retry_rule * r = yield->rules; r; r = r->next)
4746 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4747 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4753 printf(",%d.", x/1000);
4767 exim_exit(EXIT_SUCCESS);
4770 /* Handle a request to list one or more configuration options */
4771 /* If -n was set, we suppress some information */
4776 set_process_info("listing variables");
4777 if (recipients_arg >= argc)
4778 fail = !readconf_print(US"all", NULL, flag_n);
4779 else for (i = recipients_arg; i < argc; i++)
4782 (Ustrcmp(argv[i], "router") == 0 ||
4783 Ustrcmp(argv[i], "transport") == 0 ||
4784 Ustrcmp(argv[i], "authenticator") == 0 ||
4785 Ustrcmp(argv[i], "macro") == 0 ||
4786 Ustrcmp(argv[i], "environment") == 0))
4788 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4792 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4794 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4799 set_process_info("listing config");
4800 exim_exit(readconf_print(US"config", NULL, flag_n)
4801 ? EXIT_SUCCESS : EXIT_FAILURE);
4805 /* Initialise subsystems as required. */
4809 /* Handle a request to deliver one or more messages that are already on the
4810 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4811 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4813 Delivery of specific messages is typically used for a small number when
4814 prodding by hand (when the option forced_delivery will be set) or when
4815 re-execing to regain root privilege. Each message delivery must happen in a
4816 separate process, so we fork a process for each one, and run them sequentially
4817 so that debugging output doesn't get intertwined, and to avoid spawning too
4818 many processes if a long list is given. However, don't fork for the last one;
4819 this saves a process in the common case when Exim is called to deliver just one
4822 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4824 if (prod_requires_admin && !f.admin_user)
4826 fprintf(stderr, "exim: Permission denied\n");
4827 exim_exit(EXIT_FAILURE);
4829 set_process_info("delivering specified messages");
4830 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4831 for (i = msg_action_arg; i < argc; i++)
4835 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4836 that runs into a later copy into the untainted global message_id[] */
4837 /*XXX Do we need a length limit check here? */
4839 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4840 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4842 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4843 exim_underbar_exit(EXIT_SUCCESS);
4847 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4849 exim_exit(EXIT_FAILURE);
4853 exim_exit(EXIT_SUCCESS);
4857 /* If only a single queue run is requested, without SMTP listening, we can just
4858 turn into a queue runner, with an optional starting message id. */
4860 if (queue_interval == 0 && !f.daemon_listen)
4862 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4863 start_queue_run_id ? US" starting at " : US"",
4864 start_queue_run_id ? start_queue_run_id: US"",
4865 stop_queue_run_id ? US" stopping at " : US"",
4866 stop_queue_run_id ? stop_queue_run_id : US"");
4868 set_process_info("running the '%s' queue (single queue run)", queue_name);
4870 set_process_info("running the queue (single queue run)");
4871 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4872 exim_exit(EXIT_SUCCESS);
4876 /* Find the login name of the real user running this process. This is always
4877 needed when receiving a message, because it is written into the spool file. It
4878 may also be used to construct a from: or a sender: header, and in this case we
4879 need the user's full name as well, so save a copy of it, checked for RFC822
4880 syntax and munged if necessary, if it hasn't previously been set by the -F
4881 argument. We may try to get the passwd entry more than once, in case NIS or
4882 other delays are in evidence. Save the home directory for use in filter testing
4887 if ((pw = getpwuid(real_uid)) != NULL)
4889 originator_login = string_copy(US pw->pw_name);
4890 originator_home = string_copy(US pw->pw_dir);
4892 /* If user name has not been set by -F, set it from the passwd entry
4893 unless -f has been used to set the sender address by a trusted user. */
4895 if (!originator_name)
4897 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4899 uschar *name = US pw->pw_gecos;
4900 uschar *amp = Ustrchr(name, '&');
4903 /* Most Unix specify that a '&' character in the gecos field is
4904 replaced by a copy of the login name, and some even specify that
4905 the first character should be upper cased, so that's what we do. */
4910 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4911 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4912 buffer[loffset] = toupper(buffer[loffset]);
4916 /* If a pattern for matching the gecos field was supplied, apply
4917 it and then expand the name string. */
4919 if (gecos_pattern && gecos_name)
4921 const pcre2_code *re;
4922 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4924 if (regex_match_and_setup(re, name, 0, -1))
4926 uschar *new_name = expand_string(gecos_name);
4930 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4931 "gecos field \"%s\"\n", new_name, name);
4934 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4935 "\"%s\": %s\n", gecos_name, expand_string_message);
4937 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4938 "gecos field \"%s\"\n", gecos_pattern, name);
4939 store_free((void *)re);
4941 originator_name = string_copy(name);
4944 /* A trusted caller has used -f but not -F */
4946 else originator_name = US"";
4949 /* Break the retry loop */
4954 if (++i > finduser_retries) break;
4958 /* If we cannot get a user login, log the incident and give up, unless the
4959 configuration specifies something to use. When running in the test harness,
4960 any setting of unknown_login overrides the actual name. */
4962 if (!originator_login || f.running_in_test_harness)
4966 originator_login = expand_string(unknown_login);
4967 if (!originator_name && unknown_username)
4968 originator_name = expand_string(unknown_username);
4969 if (!originator_name) originator_name = US"";
4971 if (!originator_login)
4972 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4976 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4979 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
4981 /* If a message is created by this call of Exim, the uid/gid of its originator
4982 are those of the caller. These values are overridden if an existing message is
4983 read in from the spool. */
4985 originator_uid = real_uid;
4986 originator_gid = real_gid;
4988 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4989 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4991 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4992 returns. We leave this till here so that the originator_ fields are available
4993 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4996 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5000 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5001 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5002 "mua_wrapper is set");
5005 # ifndef DISABLE_TLS
5006 /* This also checks that the library linkage is working and we can call
5007 routines in it, so call even if tls_require_ciphers is unset */
5009 # ifdef MEASURE_TIMING
5010 struct timeval t0, diff;
5011 (void)gettimeofday(&t0, NULL);
5013 if (!tls_dropprivs_validate_require_cipher(FALSE))
5015 # ifdef MEASURE_TIMING
5016 report_time_since(&t0, US"validate_ciphers (delta)");
5024 /* If the sender ident has not been set (by a trusted caller) set it to
5025 the caller. This will get overwritten below for an inetd call. If a trusted
5026 caller has set it empty, unset it. */
5028 if (!sender_ident) sender_ident = originator_login;
5029 else if (!*sender_ident) sender_ident = NULL;
5031 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5032 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5033 originator_* variables set. */
5035 if (test_rewrite_arg >= 0)
5037 f.really_exim = FALSE;
5038 if (test_rewrite_arg >= argc)
5040 printf("-brw needs an address argument\n");
5041 exim_exit(EXIT_FAILURE);
5043 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5044 exim_exit(EXIT_SUCCESS);
5047 /* A locally-supplied message is considered to be coming from a local user
5048 unless a trusted caller supplies a sender address with -f, or is passing in the
5049 message via SMTP (inetd invocation or otherwise). */
5051 if ( !sender_address && !smtp_input
5052 || !f.trusted_caller && filter_test == FTEST_NONE)
5054 f.sender_local = TRUE;
5056 /* A trusted caller can supply authenticated_sender and authenticated_id
5057 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5058 defaults except when host checking. */
5060 if (!authenticated_sender && !host_checking)
5061 authenticated_sender = string_sprintf("%s@%s", originator_login,
5062 qualify_domain_sender);
5063 if (!authenticated_id && !host_checking)
5064 authenticated_id = originator_login;
5067 /* Trusted callers are always permitted to specify the sender address.
5068 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5069 is specified is the empty address. However, if a trusted caller does not
5070 specify a sender address for SMTP input, we leave sender_address unset. This
5071 causes the MAIL commands to be honoured. */
5073 if ( !smtp_input && !sender_address
5074 || !receive_check_set_sender(sender_address))
5076 /* Either the caller is not permitted to set a general sender, or this is
5077 non-SMTP input and the trusted caller has not set a sender. If there is no
5078 sender, or if a sender other than <> is set, override with the originator's
5079 login (which will get qualified below), except when checking things. */
5081 if ( !sender_address /* No sender_address set */
5083 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5084 !checking)) /* Not running tests, including filter tests */
5086 sender_address = originator_login;
5087 f.sender_address_forced = FALSE;
5088 sender_address_domain = 0;
5092 /* Remember whether an untrusted caller set the sender address */
5094 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5096 /* Ensure that the sender address is fully qualified unless it is the empty
5097 address, which indicates an error message, or doesn't exist (root caller, smtp
5098 interface, no -f argument). */
5100 if (sender_address && *sender_address && sender_address_domain == 0)
5101 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5102 qualify_domain_sender);
5104 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5106 /* Handle a request to verify a list of addresses, or test them for delivery.
5107 This must follow the setting of the sender address, since routers can be
5108 predicated upon the sender. If no arguments are given, read addresses from
5109 stdin. Set debug_level to at least D_v to get full output for address testing.
5112 if (verify_address_mode || f.address_test_mode)
5115 int flags = vopt_qualify;
5117 if (verify_address_mode)
5119 if (!verify_as_sender) flags |= vopt_is_recipient;
5120 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5125 flags |= vopt_is_recipient;
5126 debug_selector |= D_v;
5127 debug_file = stderr;
5128 debug_fd = fileno(debug_file);
5129 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5132 if (recipients_arg < argc)
5133 while (recipients_arg < argc)
5135 /* Supplied addresses are tainted since they come from a user */
5136 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5139 BOOL finished = FALSE;
5140 uschar *ss = parse_find_address_end(s, FALSE);
5141 if (*ss == ',') *ss = 0; else finished = TRUE;
5142 test_address(s, flags, &exit_value);
5145 while (*++s == ',' || isspace(*s)) ;
5151 uschar * s = get_stdinput(NULL, NULL);
5153 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5157 exim_exit(exit_value);
5160 /* Handle expansion checking. Either expand items on the command line, or read
5161 from stdin if there aren't any. If -Mset was specified, load the message so
5162 that its variables can be used, but restrict this facility to admin users.
5163 Otherwise, if -bem was used, read a message from stdin. */
5167 dns_init(FALSE, FALSE, FALSE);
5168 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5172 exim_fail("exim: permission denied\n");
5173 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5174 /* Checking the length of the ID is sufficient to validate it.
5175 Get an untainted version so file opens can be done. */
5176 message_id = string_copy_taint(message_id, FALSE);
5178 spoolname = string_sprintf("%s-H", message_id);
5179 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5180 printf ("Failed to load message datafile %s\n", message_id);
5181 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5182 printf ("Failed to load message %s\n", message_id);
5185 /* Read a test message from a file. We fudge it up to be on stdin, saving
5186 stdin itself for later reading of expansion strings. */
5188 else if (expansion_test_message)
5190 int save_stdin = dup(0);
5191 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5193 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5196 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5197 message_ended = END_NOTENDED;
5198 read_message_body(receive_msg(extract_recipients));
5199 message_linecount += body_linecount;
5200 (void)dup2(save_stdin, 0);
5201 (void)close(save_stdin);
5202 clearerr(stdin); /* Required by Darwin */
5205 /* Only admin users may see config-file macros this way */
5207 if (!f.admin_user) macros_user = macros = mlast = NULL;
5209 /* Allow $recipients for this testing */
5211 f.enable_dollar_recipients = TRUE;
5213 /* Expand command line items */
5215 if (recipients_arg < argc)
5216 while (recipients_arg < argc)
5217 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5223 char *(*fn_readline)(const char *) = NULL;
5224 void (*fn_addhist)(const char *) = NULL;
5228 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5231 while (s = get_stdinput(fn_readline, fn_addhist))
5232 expansion_test_line(s);
5235 if (dlhandle) dlclose(dlhandle);
5239 /* The data file will be open after -Mset */
5241 if (deliver_datafile >= 0)
5243 (void)close(deliver_datafile);
5244 deliver_datafile = -1;
5247 exim_exit(EXIT_SUCCESS);
5251 /* The active host name is normally the primary host name, but it can be varied
5252 for hosts that want to play several parts at once. We need to ensure that it is
5253 set for host checking, and for receiving messages. */
5255 smtp_active_hostname = primary_hostname;
5256 if (raw_active_hostname != NULL)
5258 uschar *nah = expand_string(raw_active_hostname);
5261 if (!f.expand_string_forcedfail)
5262 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5263 "(smtp_active_hostname): %s", raw_active_hostname,
5264 expand_string_message);
5266 else if (nah[0] != 0) smtp_active_hostname = nah;
5269 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5270 given IP address so that the blocking and relay configuration can be tested.
5271 Unless a sender_ident was set by -oMt, we discard it (the default is the
5272 caller's login name). An RFC 1413 call is made only if we are running in the
5273 test harness and an incoming interface and both ports are specified, because
5274 there is no TCP/IP call to find the ident for. */
5281 if (!sender_ident_set)
5283 sender_ident = NULL;
5284 if (f.running_in_test_harness && sender_host_port
5285 && interface_address && interface_port)
5286 verify_get_ident(1223); /* note hardwired port number */
5289 /* In case the given address is a non-canonical IPv6 address, canonicalize
5290 it. The code works for both IPv4 and IPv6, as it happens. */
5292 size = host_aton(sender_host_address, x);
5293 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5294 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5296 /* Now set up for testing */
5298 host_build_sender_fullhost();
5302 f.sender_local = FALSE;
5303 f.sender_host_notsocket = TRUE;
5304 debug_file = stderr;
5305 debug_fd = fileno(debug_file);
5306 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5307 "**** but without any ident (RFC 1413) callback.\n"
5308 "**** This is not for real!\n\n",
5309 sender_host_address);
5311 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5312 if (verify_check_host(&hosts_connection_nolog) == OK)
5313 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5314 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5316 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5317 because a log line has already been written for all its failure exists
5318 (usually "connection refused: <reason>") and writing another one is
5319 unnecessary clutter. */
5321 if (smtp_start_session())
5324 for (; (reset_point = store_mark()); store_reset(reset_point))
5326 if (smtp_setup_msg() <= 0) break;
5327 if (!receive_msg(FALSE)) break;
5329 return_path = sender_address = NULL;
5330 dnslist_domain = dnslist_matched = NULL;
5331 #ifndef DISABLE_DKIM
5332 dkim_cur_signer = NULL;
5335 deliver_localpart_orig = NULL;
5336 deliver_domain_orig = NULL;
5337 callout_address = sending_ip_address = NULL;
5338 deliver_localpart_data = deliver_domain_data =
5339 recipient_data = sender_data = NULL;
5340 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5344 exim_exit(EXIT_SUCCESS);
5348 /* Arrange for message reception if recipients or SMTP were specified;
5349 otherwise complain unless a version print (-bV) happened or this is a filter
5350 verification test or info dump.
5351 In the former case, show the configuration file name. */
5353 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5355 if (version_printed)
5357 if (Ustrchr(config_main_filelist, ':'))
5358 printf("Configuration file search path is %s\n", config_main_filelist);
5359 printf("Configuration file is %s\n", config_main_filename);
5360 return EXIT_SUCCESS;
5363 if (info_flag != CMDINFO_NONE)
5365 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5366 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5369 if (filter_test == FTEST_NONE)
5370 exim_usage(called_as);
5374 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5375 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5376 that we are not called from inetd, because that is rejected above. The
5377 following configuration settings are forced here:
5379 (1) Synchronous delivery (-odi)
5380 (2) Errors to stderr (-oep == -oeq)
5381 (3) No parallel remote delivery
5382 (4) Unprivileged delivery
5384 We don't force overall queueing options because there are several of them;
5385 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5386 to override any SMTP queueing. */
5390 f.synchronous_delivery = TRUE;
5391 arg_error_handling = ERRORS_STDERR;
5392 remote_max_parallel = 1;
5393 deliver_drop_privilege = TRUE;
5394 f.queue_smtp = FALSE;
5395 queue_smtp_domains = NULL;
5397 message_utf8_downconvert = -1; /* convert-if-needed */
5402 /* Prepare to accept one or more new messages on the standard input. When a
5403 message has been read, its id is returned in message_id[]. If doing immediate
5404 delivery, we fork a delivery process for each received message, except for the
5405 last one, where we can save a process switch.
5407 It is only in non-smtp mode that error_handling is allowed to be changed from
5408 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5409 sendmail error modes other than -oem ever actually used? Later: yes.) */
5411 if (!smtp_input) error_handling = arg_error_handling;
5413 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5414 logging being sent down the socket and make an identd call to get the
5417 else if (f.is_inetd)
5419 (void)fclose(stderr);
5420 exim_nullstd(); /* Re-open to /dev/null */
5421 verify_get_ident(IDENT_PORT);
5422 host_build_sender_fullhost();
5423 set_process_info("handling incoming connection from %s via inetd",
5427 /* If the sender host address has been set, build sender_fullhost if it hasn't
5428 already been done (which it will have been for inetd). This caters for the
5429 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5430 so that the test for IP options is skipped for -bs input. */
5432 if (sender_host_address && !sender_fullhost)
5434 host_build_sender_fullhost();
5435 set_process_info("handling incoming connection from %s via -oMa",
5437 f.sender_host_notsocket = TRUE;
5440 /* Otherwise, set the sender host as unknown except for inetd calls. This
5441 prevents host checking in the case of -bs not from inetd and also for -bS. */
5443 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5445 /* If stdout does not exist, then dup stdin to stdout. This can happen
5446 if exim is started from inetd. In this case fd 0 will be set to the socket,
5447 but fd 1 will not be set. This also happens for passed SMTP channels. */
5449 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5451 /* Set up the incoming protocol name and the state of the program. Root is
5452 allowed to force received protocol via the -oMr option above. If we have come
5453 via inetd, the process info has already been set up. We don't set
5454 received_protocol here for smtp input, as it varies according to
5455 batch/HELO/EHLO/AUTH/TLS. */
5459 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5460 smtp_batched_input? "batched " : "",
5461 sender_address ? sender_address : originator_login);
5465 int old_pool = store_pool;
5466 store_pool = POOL_PERM;
5467 if (!received_protocol)
5468 received_protocol = string_sprintf("local%s", called_as);
5469 store_pool = old_pool;
5470 set_process_info("accepting a local non-SMTP message from <%s>",
5474 /* Initialize the session_local_queue-only flag (this will be ignored if
5475 mua_wrapper is set) */
5478 session_local_queue_only = queue_only;
5480 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5481 the spool if so configured. On failure, we must not attempt to send an error
5482 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5483 error code is given.) */
5485 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5486 exim_fail("exim: insufficient disk space\n");
5488 /* If this is smtp input of any kind, real or batched, handle the start of the
5491 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5492 because a log line has already been written for all its failure exists
5493 (usually "connection refused: <reason>") and writing another one is
5494 unnecessary clutter. */
5500 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5501 if (verify_check_host(&hosts_connection_nolog) == OK)
5502 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5503 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5504 if (!smtp_start_session())
5507 exim_exit(EXIT_SUCCESS);
5511 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5512 (we handle buferring so as to have visibility of fill level). */
5516 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5517 if (expand_string_message)
5518 if (thismessage_size_limit == -1)
5519 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5520 "message_size_limit: %s", expand_string_message);
5522 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5523 "message_size_limit: %s", expand_string_message);
5525 setvbuf(stdin, NULL, _IONBF, 0);
5528 /* Loop for several messages when reading SMTP input. If we fork any child
5529 processes, we don't want to wait for them unless synchronous delivery is
5530 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5531 same as SIG_DFL, despite the fact that documentation often lists the default as
5532 "ignore". This is a confusing area. This is what I know:
5534 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5535 processes that complete simply to go away without ever becoming defunct. You
5536 can't then wait for them - but we don't want to wait for them in the
5537 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5538 happen for all OS (e.g. *BSD is different).
5540 But that's not the end of the story. Some (many? all?) systems have the
5541 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5542 has by default, so it seems that the difference is merely one of default
5543 (compare restarting vs non-restarting signals).
5545 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5546 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5547 of the loop below. Paranoia rules.
5549 February 2003: That's *still* not the end of the story. There are now versions
5550 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5551 process then calls waitpid(), a grumble is written to the system log, because
5552 this is logically inconsistent. In other words, it doesn't like the paranoia.
5553 As a consequence of this, the waitpid() below is now excluded if we are sure
5554 that SIG_IGN works. */
5556 if (!f.synchronous_delivery)
5559 struct sigaction act;
5560 act.sa_handler = SIG_IGN;
5561 sigemptyset(&(act.sa_mask));
5562 act.sa_flags = SA_NOCLDWAIT;
5563 sigaction(SIGCHLD, &act, NULL);
5565 signal(SIGCHLD, SIG_IGN);
5569 /* Save the current store pool point, for resetting at the start of
5570 each message, and save the real sender address, if any. */
5572 real_sender_address = sender_address;
5574 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5575 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5578 for (BOOL more = TRUE; more; )
5580 rmark reset_point = store_mark();
5583 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5584 input and build the recipients list, before calling receive_msg() to read the
5585 message proper. Whatever sender address is given in the SMTP transaction is
5586 often ignored for local senders - we use the actual sender, which is normally
5587 either the underlying user running this process or a -f argument provided by
5588 a trusted caller. It is saved in real_sender_address. The test for whether to
5589 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5594 if ((rc = smtp_setup_msg()) > 0)
5596 if (real_sender_address != NULL &&
5597 !receive_check_set_sender(sender_address))
5599 sender_address = raw_sender = real_sender_address;
5600 sender_address_unrewritten = NULL;
5603 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5604 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5605 the very end. The result of the ACL is ignored (as for other non-SMTP
5606 messages). It is run for its potential side effects. */
5608 if (smtp_batched_input && acl_not_smtp_start != NULL)
5610 uschar *user_msg, *log_msg;
5611 f.enable_dollar_recipients = TRUE;
5612 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5613 &user_msg, &log_msg);
5614 f.enable_dollar_recipients = FALSE;
5617 /* Now get the data for the message */
5619 more = receive_msg(extract_recipients);
5622 cancel_cutthrough_connection(TRUE, US"receive dropped");
5623 if (more) goto MORELOOP;
5624 smtp_log_no_mail(); /* Log no mail if configured */
5625 exim_exit(EXIT_FAILURE);
5630 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5631 smtp_log_no_mail(); /* Log no mail if configured */
5632 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5636 /* In the non-SMTP case, we have all the information from the command
5637 line, but must process it in case it is in the more general RFC822
5638 format, and in any case, to detect syntax errors. Also, it appears that
5639 the use of comma-separated lists as single arguments is common, so we
5640 had better support them. */
5645 int count = argc - recipients_arg;
5646 uschar **list = argv + recipients_arg;
5648 /* These options cannot be changed dynamically for non-SMTP messages */
5650 f.active_local_sender_retain = local_sender_retain;
5651 f.active_local_from_check = local_from_check;
5653 /* Save before any rewriting */
5655 raw_sender = string_copy(sender_address);
5657 /* Loop for each argument (supplied by user hence tainted) */
5659 for (int i = 0; i < count; i++)
5661 int start, end, domain;
5663 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5664 * We'll still want to cap it to something, just in case. */
5665 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5667 /* Loop for each comma-separated address */
5671 BOOL finished = FALSE;
5673 uschar *ss = parse_find_address_end(s, FALSE);
5675 if (*ss == ',') *ss = 0; else finished = TRUE;
5677 /* Check max recipients - if -t was used, these aren't recipients */
5679 if (recipients_max > 0 && ++rcount > recipients_max &&
5680 !extract_recipients)
5681 if (error_handling == ERRORS_STDERR)
5683 fprintf(stderr, "exim: too many recipients\n");
5684 exim_exit(EXIT_FAILURE);
5688 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5689 errors_sender_rc : EXIT_FAILURE;
5693 BOOL b = allow_utf8_domains;
5694 allow_utf8_domains = TRUE;
5697 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5701 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5702 else allow_utf8_domains = b;
5707 if (domain == 0 && !f.allow_unqualified_recipient)
5710 errmess = US"unqualified recipient address not allowed";
5714 if (error_handling == ERRORS_STDERR)
5716 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5717 string_printing(list[i]), errmess);
5718 exim_exit(EXIT_FAILURE);
5724 eblock.text1 = string_printing(list[i]);
5725 eblock.text2 = errmess;
5727 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5728 errors_sender_rc : EXIT_FAILURE;
5731 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5734 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5738 /* Show the recipients when debugging */
5742 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5743 if (recipients_list)
5745 debug_printf("Recipients:\n");
5746 for (int i = 0; i < recipients_count; i++)
5747 debug_printf(" %s\n", recipients_list[i].address);
5751 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5752 ignored; rejecting here would just add complication, and it can just as
5753 well be done later. Allow $recipients to be visible in the ACL. */
5755 if (acl_not_smtp_start)
5757 uschar *user_msg, *log_msg;
5758 f.enable_dollar_recipients = TRUE;
5759 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5760 &user_msg, &log_msg);
5761 f.enable_dollar_recipients = FALSE;
5764 /* Pause for a while waiting for input. If none received in that time,
5765 close the logfile, if we had one open; then if we wait for a long-running
5766 datasource (months, in one use-case) log rotation will not leave us holding
5769 if (!receive_timeout)
5770 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5773 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5774 will just read the headers for the message, and not write anything onto the
5777 message_ended = END_NOTENDED;
5778 more = receive_msg(extract_recipients);
5780 /* more is always FALSE here (not SMTP message) when reading a message
5781 for real; when reading the headers of a message for filter testing,
5782 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5784 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5785 } /* Non-SMTP message reception */
5787 /* If this is a filter testing run, there are headers in store, but
5788 no message on the spool. Run the filtering code in testing mode, setting
5789 the domain to the qualify domain and the local part to the current user,
5790 unless they have been set by options. The prefix and suffix are left unset
5791 unless specified. The the return path is set to to the sender unless it has
5792 already been set from a return-path header in the message. */
5794 if (filter_test != FTEST_NONE)
5796 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5797 deliver_domain_orig = deliver_domain;
5798 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5799 deliver_localpart_orig = deliver_localpart;
5800 deliver_localpart_prefix = US ftest_prefix;
5801 deliver_localpart_suffix = US ftest_suffix;
5802 deliver_home = originator_home;
5806 printf("Return-path copied from sender\n");
5807 return_path = string_copy(sender_address);
5810 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5811 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5813 receive_add_recipient(
5814 string_sprintf("%s%s%s@%s",
5815 ftest_prefix ? ftest_prefix : US"",
5817 ftest_suffix ? ftest_suffix : US"",
5818 deliver_domain), -1);
5820 printf("Recipient = %s\n", recipients_list[0].address);
5821 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5822 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5824 if (chdir("/")) /* Get away from wherever the user is running this from */
5826 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5827 exim_exit(EXIT_FAILURE);
5830 /* Now we run either a system filter test, or a user filter test, or both.
5831 In the latter case, headers added by the system filter will persist and be
5832 available to the user filter. We need to copy the filter variables
5835 if (filter_test & FTEST_SYSTEM)
5836 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5837 exim_exit(EXIT_FAILURE);
5839 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5841 if (filter_test & FTEST_USER)
5842 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5843 exim_exit(EXIT_FAILURE);
5845 exim_exit(EXIT_SUCCESS);
5848 /* Else act on the result of message reception. We should not get here unless
5849 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5850 will be TRUE. If it is not, check on the number of messages received in this
5853 if ( !session_local_queue_only
5854 && smtp_accept_queue_per_connection > 0
5855 && receive_messagecount > smtp_accept_queue_per_connection)
5857 session_local_queue_only = TRUE;
5858 queue_only_reason = 2;
5861 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5862 and queue_only_load is set, check that the load average is below it. If it is
5863 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5864 default), we put the whole session into queue_only mode. It then remains this
5865 way for any subsequent messages on the same SMTP connection. This is a
5866 deliberate choice; even though the load average may fall, it doesn't seem
5867 right to deliver later messages on the same call when not delivering earlier
5868 ones. However, there are odd cases where this is not wanted, so this can be
5869 changed by setting queue_only_load_latch false. */
5871 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5872 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5874 queue_only_reason = 3;
5875 if (queue_only_load_latch) session_local_queue_only = TRUE;
5878 /* If running as an MUA wrapper, all queueing options and freezing options
5882 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5884 /* Log the queueing here, when it will get a message id attached, but
5885 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5888 if (local_queue_only)
5890 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5891 switch(queue_only_reason)
5894 log_write(L_delay_delivery,
5895 LOG_MAIN, "no immediate delivery: more than %d messages "
5896 "received in one connection", smtp_accept_queue_per_connection);
5900 log_write(L_delay_delivery,
5901 LOG_MAIN, "no immediate delivery: load average %.2f",
5902 (double)load_average/1000.0);
5907 else if (f.queue_only_policy || f.deliver_freeze)
5908 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5910 /* Else do the delivery unless the ACL or local_scan() called for queue only
5911 or froze the message. Always deliver in a separate process. A fork failure is
5912 not a disaster, as the delivery will eventually happen on a subsequent queue
5913 run. The search cache must be tidied before the fork, as the parent will
5914 do it before exiting. The child will trigger a lookup failure and
5915 thereby defer the delivery if it tries to use (for example) a cached ldap
5916 connection that the parent has called unbind on. */
5923 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5926 close_unwanted(); /* Close unwanted file descriptors and TLS */
5927 exim_nullstd(); /* Ensure std{in,out,err} exist */
5929 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5930 mode, deliver_drop_privilege is forced TRUE). */
5932 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5934 delivery_re_exec(CEE_EXEC_EXIT);
5935 /* Control does not return here. */
5938 /* No need to re-exec */
5940 rc = deliver_message(message_id, FALSE, FALSE);
5942 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5943 ? EXIT_SUCCESS : EXIT_FAILURE);
5948 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5949 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5950 "process: %s", strerror(errno));
5954 release_cutthrough_connection(US"msg passed for delivery");
5956 /* In the parent, wait if synchronous delivery is required. This will
5957 always be the case in MUA wrapper mode. */
5959 if (f.synchronous_delivery)
5962 while (wait(&status) != pid);
5963 if ((status & 0x00ff) != 0)
5964 log_write(0, LOG_MAIN|LOG_PANIC,
5965 "process %d crashed with signal %d while delivering %s",
5966 (int)pid, status & 0x00ff, message_id);
5967 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5972 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5973 automatically reaps children (see comments above the loop), clear away any
5974 finished subprocesses here, in case there are lots of messages coming in
5975 from the same source. */
5977 #ifndef SIG_IGN_WORKS
5978 while (waitpid(-1, NULL, WNOHANG) > 0);
5982 return_path = sender_address = NULL;
5983 authenticated_sender = NULL;
5984 deliver_localpart_orig = NULL;
5985 deliver_domain_orig = NULL;
5986 deliver_host = deliver_host_address = NULL;
5987 dnslist_domain = dnslist_matched = NULL;
5988 #ifdef WITH_CONTENT_SCAN
5989 malware_name = NULL;
5991 callout_address = NULL;
5992 sending_ip_address = NULL;
5993 deliver_localpart_data = deliver_domain_data =
5994 recipient_data = sender_data = NULL;
5996 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5998 store_reset(reset_point);
6001 exim_exit(EXIT_SUCCESS); /* Never returns */
6002 return 0; /* To stop compiler warning */