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] ? Ustrlen(argv[0]) : 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 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1838 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1840 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1841 at the start of a program; however, it seems that some environments do not
1842 follow this. A "strange" locale can affect the formatting of timestamps, so we
1845 setlocale(LC_ALL, "C");
1847 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1849 #ifdef _POSIX_MONOTONIC_CLOCK
1853 /* Set up the default handler for timing using alarm(). */
1855 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1857 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1858 because store_malloc writes a log entry on failure. */
1860 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1861 exim_fail("exim: failed to get store for log buffer\n");
1863 /* Initialize the default log options. */
1865 bits_set(log_selector, log_selector_size, log_default);
1867 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1868 NULL when the daemon is run and the file is closed. We have to use this
1869 indirection, because some systems don't allow writing to the variable "stderr".
1872 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1874 /* Ensure there is a big buffer for temporary use in several places. It is put
1875 in malloc store so that it can be freed for enlargement if necessary. */
1877 big_buffer = store_malloc(big_buffer_size);
1879 /* Set up the handler for the data request signal, and set the initial
1880 descriptive text. */
1882 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1883 set_process_info("initializing");
1884 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1887 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1888 sigaction(SIGSEGV, &act, NULL);
1891 signal(SIGSEGV, segv_handler); /* log faults */
1894 /* If running in a dockerized environment, the TERM signal is only
1895 delegated to the PID 1 if we request it by setting an signal handler */
1896 if (getpid() == 1) signal(SIGTERM, term_handler);
1898 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1899 in the daemon code. For the rest of Exim's uses, we ignore it. */
1901 signal(SIGHUP, SIG_IGN);
1903 /* We don't want to die on pipe errors as the code is written to handle
1904 the write error instead. */
1906 signal(SIGPIPE, SIG_IGN);
1908 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1909 set to SIG_IGN. This causes subprocesses that complete before the parent
1910 process waits for them not to hang around, so when Exim calls wait(), nothing
1911 is there. The wait() code has been made robust against this, but let's ensure
1912 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1913 ending status. We use sigaction rather than plain signal() on those OS where
1914 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1915 problem on AIX with this.) */
1919 struct sigaction act;
1920 act.sa_handler = SIG_DFL;
1921 sigemptyset(&(act.sa_mask));
1923 sigaction(SIGCHLD, &act, NULL);
1926 signal(SIGCHLD, SIG_DFL);
1929 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1934 /* Set up the version number. Set up the leading 'E' for the external form of
1935 message ids, set the pointer to the internal form, and initialize it to
1936 indicate no message being processed. */
1939 message_id_option[0] = '-';
1940 message_id_external = message_id_option + 1;
1941 message_id_external[0] = 'E';
1942 message_id = message_id_external + 1;
1945 /* Set the umask to zero so that any files Exim creates using open() are
1946 created with the modes that it specifies. NOTE: Files created with fopen() have
1947 a problem, which was not recognized till rather late (February 2006). With this
1948 umask, such files will be world writeable. (They are all content scanning files
1949 in the spool directory, which isn't world-accessible, so this is not a
1950 disaster, but it's untidy.) I don't want to change this overall setting,
1951 however, because it will interact badly with the open() calls. Instead, there's
1952 now a function called modefopen() that fiddles with the umask while calling
1957 /* Precompile the regular expression for matching a message id. Keep this in
1958 step with the code that generates ids in the accept.c module. We need to do
1959 this here, because the -M options check their arguments for syntactic validity
1960 using mac_ismsgid, which uses this. */
1963 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1965 /* Precompile the regular expression that is used for matching an SMTP error
1966 code, possibly extended, at the start of an error message. Note that the
1967 terminating whitespace character is included. */
1970 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1973 #ifdef WHITELIST_D_MACROS
1974 /* Precompile the regular expression used to filter the content of macros
1975 given to -D for permissibility. */
1977 regex_whitelisted_macro =
1978 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
1981 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1983 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1984 this seems to be a generally accepted convention, since one finds symbolic
1985 links called "mailq" in standard OS configurations. */
1987 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1988 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1991 receiving_message = FALSE;
1992 called_as = US"-mailq";
1995 /* If the program is called as "rmail" treat it as equivalent to
1996 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1997 i.e. preventing a single dot on a line from terminating the message, and
1998 returning with zero return code, even in cases of error (provided an error
1999 message has been sent). */
2001 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2002 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2005 called_as = US"-rmail";
2006 errors_sender_rc = EXIT_SUCCESS;
2009 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2010 this is a smail convention. */
2012 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2013 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2015 smtp_input = smtp_batched_input = TRUE;
2016 called_as = US"-rsmtp";
2019 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2020 this is a smail convention. */
2022 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2023 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2026 receiving_message = FALSE;
2027 called_as = US"-runq";
2030 /* If the program is called as "newaliases" treat it as equivalent to
2031 "exim -bi"; this is a sendmail convention. */
2033 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2034 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2037 receiving_message = FALSE;
2038 called_as = US"-newaliases";
2041 /* Save the original effective uid for a couple of uses later. It should
2042 normally be root, but in some esoteric environments it may not be. */
2044 original_euid = geteuid();
2045 original_egid = getegid();
2047 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2048 to be the same as the real ones. This makes a difference only if Exim is setuid
2049 (or setgid) to something other than root, which could be the case in some
2050 special configurations. */
2052 real_uid = getuid();
2053 real_gid = getgid();
2055 if (real_uid == root_uid)
2057 if ((rv = setgid(real_gid)))
2058 exim_fail("exim: setgid(%ld) failed: %s\n",
2059 (long int)real_gid, strerror(errno));
2060 if ((rv = setuid(real_uid)))
2061 exim_fail("exim: setuid(%ld) failed: %s\n",
2062 (long int)real_uid, strerror(errno));
2065 /* If neither the original real uid nor the original euid was root, Exim is
2066 running in an unprivileged state. */
2068 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2070 /* For most of the args-parsing we need to use permanent pool memory */
2072 int old_pool = store_pool;
2073 store_pool = POOL_PERM;
2075 /* Scan the program's arguments. Some can be dealt with right away; others are
2076 simply recorded for checking and handling afterwards. Do a high-level switch
2077 on the second character (the one after '-'), to save some effort. */
2079 for (i = 1; i < argc; i++)
2081 BOOL badarg = FALSE;
2082 uschar * arg = argv[i];
2086 /* An argument not starting with '-' is the start of a recipients list;
2087 break out of the options-scanning loop. */
2095 /* An option consisting of -- terminates the options */
2097 if (Ustrcmp(arg, "--") == 0)
2099 recipients_arg = i + 1;
2103 /* Handle flagged options */
2105 switchchar = arg[1];
2108 /* Make all -ex options synonymous with -oex arguments, since that
2109 is assumed by various callers. Also make -qR options synonymous with -R
2110 options, as that seems to be required as well. Allow for -qqR too, and
2111 the same for -S options. */
2113 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2114 Ustrncmp(arg+1, "qR", 2) == 0 ||
2115 Ustrncmp(arg+1, "qS", 2) == 0)
2117 switchchar = arg[2];
2120 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2122 switchchar = arg[3];
2124 f.queue_2stage = TRUE;
2127 /* Make -r synonymous with -f, since it is a documented alias */
2129 else if (arg[1] == 'r') switchchar = 'f';
2131 /* Make -ov synonymous with -v */
2133 else if (Ustrcmp(arg, "-ov") == 0)
2139 /* deal with --option_aliases */
2140 else if (switchchar == '-')
2142 if (Ustrcmp(argrest, "help") == 0)
2144 usage_wanted = TRUE;
2147 else if (Ustrcmp(argrest, "version") == 0)
2154 /* High-level switch on active initial letter */
2159 /* sendmail uses -Ac and -Am to control which .cf file is used;
2162 if (!*argrest) { badarg = TRUE; break; }
2165 BOOL ignore = FALSE;
2170 if (*(argrest + 1) == '\0')
2174 if (!ignore) badarg = TRUE;
2178 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2179 so has no need of it. */
2182 if (!*argrest) i++; /* Skip over the type */
2188 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2192 /* -bd: Run in daemon mode, awaiting SMTP connections.
2193 -bdf: Ditto, but in the foreground.
2196 f.daemon_listen = TRUE;
2197 if (*argrest == 'f') f.background_daemon = FALSE;
2198 else if (*argrest) badarg = TRUE;
2201 /* -be: Run in expansion test mode
2202 -bem: Ditto, but read a message from a file first
2205 expansion_test = checking = TRUE;
2206 if (*argrest == 'm')
2208 if (++i >= argc) { badarg = TRUE; break; }
2209 expansion_test_message = argv[i];
2212 if (*argrest) badarg = TRUE;
2215 /* -bF: Run system filter test */
2217 filter_test |= checking = FTEST_SYSTEM;
2218 if (*argrest) badarg = TRUE;
2219 else if (++i < argc) filter_test_sfile = argv[i];
2220 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2223 /* -bf: Run user filter test
2224 -bfd: Set domain for filter testing
2225 -bfl: Set local part for filter testing
2226 -bfp: Set prefix for filter testing
2227 -bfs: Set suffix for filter testing
2232 filter_test |= checking = FTEST_USER;
2233 if (++i < argc) filter_test_ufile = argv[i];
2234 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2239 exim_fail("exim: string expected after %s\n", arg);
2240 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2241 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2242 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2243 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2248 /* -bh: Host checking - an IP address must follow. */
2250 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2252 if (++i >= argc) { badarg = TRUE; break; }
2253 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2254 host_checking = checking = f.log_testing_mode = TRUE;
2255 f.host_checking_callout = *argrest == 'c';
2256 message_logs = FALSE;
2261 /* -bi: This option is used by sendmail to initialize *the* alias file,
2262 though it has the -oA option to specify a different file. Exim has no
2263 concept of *the* alias file, but since Sun's YP make script calls
2264 sendmail this way, some support must be provided. */
2266 if (!*argrest) bi_option = TRUE;
2270 /* -bI: provide information, of the type to follow after a colon.
2271 This is an Exim flag. */
2273 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2275 uschar *p = argrest+1;
2276 info_flag = CMDINFO_HELP;
2278 if (strcmpic(p, CUS"sieve") == 0)
2280 info_flag = CMDINFO_SIEVE;
2283 else if (strcmpic(p, CUS"dscp") == 0)
2285 info_flag = CMDINFO_DSCP;
2288 else if (strcmpic(p, CUS"help") == 0)
2294 /* -bm: Accept and deliver message - the default option. Reinstate
2295 receiving_message, which got turned off for all -b options.
2296 -bmalware: test the filename given for malware */
2298 if (!*argrest) receiving_message = TRUE;
2299 else if (Ustrcmp(argrest, "alware") == 0)
2301 if (++i >= argc) { badarg = TRUE; break; }
2303 malware_test_file = argv[i];
2308 /* -bnq: For locally originating messages, do not qualify unqualified
2309 addresses. In the envelope, this causes errors; in header lines they
2312 if (Ustrcmp(argrest, "q") == 0)
2314 f.allow_unqualified_sender = FALSE;
2315 f.allow_unqualified_recipient = FALSE;
2320 /* -bpxx: List the contents of the mail queue, in various forms. If
2321 the option is -bpc, just a queue count is needed. Otherwise, if the
2322 first letter after p is r, then order is random. */
2324 if (*argrest == 'c')
2327 if (*++argrest) badarg = TRUE;
2331 if (*argrest == 'r')
2333 list_queue_option = 8;
2336 else list_queue_option = 0;
2340 /* -bp: List the contents of the mail queue, top-level only */
2344 /* -bpu: List the contents of the mail queue, top-level undelivered */
2346 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2348 /* -bpa: List the contents of the mail queue, including all delivered */
2350 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2352 /* Unknown after -bp[r] */
2358 /* -bP: List the configuration variables given as the address list.
2359 Force -v, so configuration errors get displayed. */
2362 /* -bP config: we need to setup here, because later,
2363 when list_options is checked, the config is read already */
2366 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2369 readconf_save_config(version_string);
2373 list_options = TRUE;
2374 debug_selector |= D_v;
2375 debug_file = stderr;
2379 /* -brt: Test retry configuration lookup */
2381 if (Ustrcmp(argrest, "t") == 0)
2384 test_retry_arg = i + 1;
2388 /* -brw: Test rewrite configuration */
2390 else if (Ustrcmp(argrest, "w") == 0)
2393 test_rewrite_arg = i + 1;
2399 /* -bS: Read SMTP commands on standard input, but produce no replies -
2400 all errors are reported by sending messages. */
2403 smtp_input = smtp_batched_input = receiving_message = TRUE;
2407 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2408 on standard output. */
2410 if (!*argrest) smtp_input = receiving_message = TRUE;
2414 /* -bt: address testing mode */
2417 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2421 /* -bv: verify addresses */
2424 verify_address_mode = checking = f.log_testing_mode = TRUE;
2426 /* -bvs: verify sender addresses */
2428 else if (Ustrcmp(argrest, "s") == 0)
2430 verify_address_mode = checking = f.log_testing_mode = TRUE;
2431 verify_as_sender = TRUE;
2436 /* -bV: Print version string and support details */
2440 printf("Exim version %s #%s built %s\n", version_string,
2441 version_cnumber, version_date);
2442 printf("%s\n", CS version_copyright);
2443 version_printed = TRUE;
2444 show_whats_supported(stdout);
2445 f.log_testing_mode = TRUE;
2450 /* -bw: inetd wait mode, accept a listening socket as stdin */
2452 f.inetd_wait_mode = TRUE;
2453 f.background_daemon = FALSE;
2454 f.daemon_listen = TRUE;
2456 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2457 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2468 /* -C: change configuration file list; ignore if it isn't really
2469 a change! Enforce a prefix check if required. */
2473 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2474 if (Ustrcmp(config_main_filelist, argrest) != 0)
2476 #ifdef ALT_CONFIG_PREFIX
2478 int len = Ustrlen(ALT_CONFIG_PREFIX);
2479 const uschar *list = argrest;
2481 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2482 while((filename = string_nextinlist(&list, &sep, big_buffer,
2484 if ( ( Ustrlen(filename) < len
2485 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2486 || Ustrstr(filename, "/../") != NULL
2488 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2490 exim_fail("-C Permission denied\n");
2492 if (real_uid != root_uid)
2494 #ifdef TRUSTED_CONFIG_LIST
2496 if (real_uid != exim_uid
2497 #ifdef CONFIGURE_OWNER
2498 && real_uid != config_uid
2501 f.trusted_config = FALSE;
2504 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2507 struct stat statbuf;
2509 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2510 (statbuf.st_uid != root_uid /* owner not root */
2511 #ifdef CONFIGURE_OWNER
2512 && statbuf.st_uid != config_uid /* owner not the special one */
2515 (statbuf.st_gid != root_gid /* group not root */
2516 #ifdef CONFIGURE_GROUP
2517 && statbuf.st_gid != config_gid /* group not the special one */
2519 && (statbuf.st_mode & 020) != 0 /* group writeable */
2521 (statbuf.st_mode & 2) != 0) /* world writeable */
2523 f.trusted_config = FALSE;
2528 /* Well, the trust list at least is up to scratch... */
2530 uschar *trusted_configs[32];
2533 int old_pool = store_pool;
2534 store_pool = POOL_MAIN;
2536 reset_point = store_mark();
2537 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2539 uschar *start = big_buffer, *nl;
2540 while (*start && isspace(*start))
2544 nl = Ustrchr(start, '\n');
2547 trusted_configs[nr_configs++] = string_copy(start);
2548 if (nr_configs == nelem(trusted_configs))
2556 const uschar *list = argrest;
2558 while (f.trusted_config && (filename = string_nextinlist(&list,
2559 &sep, big_buffer, big_buffer_size)))
2561 for (i=0; i < nr_configs; i++)
2562 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2564 if (i == nr_configs)
2566 f.trusted_config = FALSE;
2571 else /* No valid prefixes found in trust_list file. */
2572 f.trusted_config = FALSE;
2573 store_reset(reset_point);
2574 store_pool = old_pool;
2577 else /* Could not open trust_list file. */
2578 f.trusted_config = FALSE;
2581 /* Not root; don't trust config */
2582 f.trusted_config = FALSE;
2586 config_main_filelist = argrest;
2587 f.config_changed = TRUE;
2592 /* -D: set up a macro definition */
2595 #ifdef DISABLE_D_OPTION
2596 exim_fail("exim: -D is not available in this Exim binary\n");
2602 uschar *s = argrest;
2605 while (isspace(*s)) s++;
2607 if (*s < 'A' || *s > 'Z')
2608 exim_fail("exim: macro name set by -D must start with "
2609 "an upper case letter\n");
2611 while (isalnum(*s) || *s == '_')
2613 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2617 if (ptr == 0) { badarg = TRUE; break; }
2618 while (isspace(*s)) s++;
2621 if (*s++ != '=') { badarg = TRUE; break; }
2622 while (isspace(*s)) s++;
2625 for (m = macros_user; m; m = m->next)
2626 if (Ustrcmp(m->name, name) == 0)
2627 exim_fail("exim: duplicated -D in command line\n");
2629 m = macro_create(name, s, TRUE);
2631 if (clmacro_count >= MAX_CLMACROS)
2632 exim_fail("exim: too many -D options on command line\n");
2633 clmacros[clmacro_count++] =
2634 string_sprintf("-D%s=%s", m->name, m->replacement);
2639 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2640 The latter is now a no-op, retained for compatibility only. If -dd is used,
2641 debugging subprocesses of the daemon is disabled. */
2644 if (Ustrcmp(argrest, "ropcr") == 0)
2646 /* drop_cr = TRUE; */
2649 /* Use an intermediate variable so that we don't set debugging while
2650 decoding the debugging bits. */
2654 unsigned int selector = D_default;
2657 if (*argrest == 'd')
2659 f.debug_daemon = TRUE;
2663 decode_bits(&selector, 1, debug_notall, argrest,
2664 debug_options, debug_options_count, US"debug", 0);
2665 debug_selector = selector;
2670 /* -E: This is a local error message. This option is not intended for
2671 external use at all, but is not restricted to trusted callers because it
2672 does no harm (just suppresses certain error messages) and if Exim is run
2673 not setuid root it won't always be trusted when it generates error
2674 messages using this option. If there is a message id following -E, point
2675 message_reference at it, for logging. */
2678 f.local_error_message = TRUE;
2679 if (mac_ismsgid(argrest)) message_reference = argrest;
2683 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2684 option, so it looks as if historically the -oex options are also callable
2685 without the leading -o. So we have to accept them. Before the switch,
2686 anything starting -oe has been converted to -e. Exim does not support all
2687 of the sendmail error options. */
2690 if (Ustrcmp(argrest, "e") == 0)
2692 arg_error_handling = ERRORS_SENDER;
2693 errors_sender_rc = EXIT_SUCCESS;
2695 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2696 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2697 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2698 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2703 /* -F: Set sender's full name, used instead of the gecos entry from
2704 the password file. Since users can usually alter their gecos entries,
2705 there's no security involved in using this instead. The data can follow
2706 the -F or be in the next argument. */
2710 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2711 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2712 f.sender_name_forced = TRUE;
2716 /* -f: Set sender's address - this value is only actually used if Exim is
2717 run by a trusted user, or if untrusted_set_sender is set and matches the
2718 address, except that the null address can always be set by any user. The
2719 test for this happens later, when the value given here is ignored when not
2720 permitted. For an untrusted user, the actual sender is still put in Sender:
2721 if it doesn't match the From: header (unless no_local_from_check is set).
2722 The data can follow the -f or be in the next argument. The -r switch is an
2723 obsolete form of -f but since there appear to be programs out there that
2724 use anything that sendmail has ever supported, better accept it - the
2725 synonymizing is done before the switch above.
2727 At this stage, we must allow domain literal addresses, because we don't
2728 know what the setting of allow_domain_literals is yet. Ditto for trailing
2729 dots and strip_trailing_dot. */
2733 int dummy_start, dummy_end;
2736 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2737 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2739 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2742 uschar * temp = argrest + Ustrlen(argrest) - 1;
2743 while (temp >= argrest && isspace(*temp)) temp--;
2744 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2745 allow_domain_literals = TRUE;
2746 strip_trailing_dot = TRUE;
2748 allow_utf8_domains = TRUE;
2750 if (!(sender_address = parse_extract_address(argrest, &errmess,
2751 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2752 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2754 sender_address = string_copy_taint(sender_address, TRUE);
2756 message_smtputf8 = string_is_utf8(sender_address);
2757 allow_utf8_domains = FALSE;
2759 allow_domain_literals = FALSE;
2760 strip_trailing_dot = FALSE;
2762 f.sender_address_forced = TRUE;
2766 /* -G: sendmail invocation to specify that it's a gateway submission and
2767 sendmail may complain about problems instead of fixing them.
2768 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2769 not at this time complain about problems. */
2775 /* -h: Set the hop count for an incoming message. Exim does not currently
2776 support this; it always computes it by counting the Received: headers.
2777 To put it in will require a change to the spool header file format. */
2781 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2782 if (!isdigit(*argrest)) badarg = TRUE;
2786 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2787 not to be documented for sendmail but mailx (at least) uses it) */
2790 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2794 /* -L: set the identifier used for syslog; equivalent to setting
2795 syslog_processname in the config file, but needs to be an admin option. */
2799 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2800 if ((sz = Ustrlen(argrest)) > 32)
2801 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2803 exim_fail("exim: the -L syslog name is too short\n");
2804 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2808 receiving_message = FALSE;
2810 /* -MC: continue delivery of another message via an existing open
2811 file descriptor. This option is used for an internal call by the
2812 smtp transport when there is a pending message waiting to go to an
2813 address to which it has got a connection. Five subsequent arguments are
2814 required: transport name, host name, IP address, sequence number, and
2815 message_id. Transports may decline to create new processes if the sequence
2816 number gets too big. The channel is stdin. This (-MC) must be the last
2817 argument. There's a subsequent check that the real-uid is privileged.
2819 If we are running in the test harness. delay for a bit, to let the process
2820 that set this one up complete. This makes for repeatability of the logging,
2823 if (Ustrcmp(argrest, "C") == 0)
2825 union sockaddr_46 interface_sock;
2826 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2829 exim_fail("exim: too many or too few arguments after -MC\n");
2831 if (msg_action_arg >= 0)
2832 exim_fail("exim: incompatible arguments\n");
2834 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2835 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2836 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2837 continue_sequence = Uatoi(argv[++i]);
2838 msg_action = MSG_DELIVER;
2839 msg_action_arg = ++i;
2840 forced_delivery = TRUE;
2841 queue_run_pid = passed_qr_pid;
2842 queue_run_pipe = passed_qr_pipe;
2844 if (!mac_ismsgid(argv[i]))
2845 exim_fail("exim: malformed message id %s after -MC option\n",
2848 /* Set up $sending_ip_address and $sending_port, unless proxied */
2850 if (!continue_proxy_cipher)
2851 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2853 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2856 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2859 testharness_pause_ms(500);
2863 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2867 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2868 precedes -MC (see above). The flag indicates that the host to which
2869 Exim is connected has accepted an AUTH sequence. */
2871 case 'A': f.smtp_authenticated = TRUE; break;
2873 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2874 that exim is connected to supports the esmtp extension DSN */
2876 case 'D': smtp_peer_options |= OPTION_DSN; break;
2878 /* -MCd: for debug, set a process-purpose string */
2880 case 'd': if (++i < argc)
2881 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2885 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2886 from the commandline should be tainted - but we will need an untainted
2887 value for the spoolfile when doing a -odi delivery process. */
2889 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2893 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2895 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2897 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2898 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2899 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2901 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2903 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2908 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2909 it preceded -MC (see above) */
2911 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2913 #ifdef SUPPORT_SOCKS
2914 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2915 case 'p': proxy_session = TRUE;
2918 proxy_local_address = string_copy_taint(argv[i], TRUE);
2921 proxy_local_port = Uatoi(argv[i]);
2924 proxy_external_address = string_copy_taint(argv[i], TRUE);
2927 proxy_external_port = Uatoi(argv[i]);
2933 /* -MCQ: pass on the pid of the queue-running process that started
2934 this chain of deliveries and the fd of its synchronizing pipe; this
2935 is useful only when it precedes -MC (see above) */
2937 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2939 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2943 /* -MCq: do a quota check on the given recipient for the given size
2944 of message. Separate from -MC. */
2945 case 'q': rcpt_verify_quota = TRUE;
2946 if (++i < argc) message_size = Uatoi(argv[i]);
2950 /* -MCS: set the smtp_use_size flag; this is useful only when it
2951 precedes -MC (see above) */
2953 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2956 /* -MCs: used with -MCt; SNI was sent */
2957 /* -MCr: ditto, DANE */
2960 case 's': if (++i < argc)
2962 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
2963 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
2968 /* -MCt: similar to -MCT below but the connection is still open
2969 via a proxy process which handles the TLS context and coding.
2970 Require three arguments for the proxied local address and port,
2971 and the TLS cipher. */
2973 case 't': if (++i < argc)
2974 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
2977 sending_port = (int)(Uatol(argv[i]));
2980 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
2984 /* -MCT: set the tls_offered flag; this is useful only when it
2985 precedes -MC (see above). The flag indicates that the host to which
2986 Exim is connected has offered TLS support. */
2988 case 'T': smtp_peer_options |= OPTION_TLS; break;
2991 default: badarg = TRUE; break;
2996 /* -M[x]: various operations on the following list of message ids:
2997 -M deliver the messages, ignoring next retry times and thawing
2998 -Mc deliver the messages, checking next retry times, no thawing
2999 -Mf freeze the messages
3000 -Mg give up on the messages
3001 -Mt thaw the messages
3002 -Mrm remove the messages
3003 In the above cases, this must be the last option. There are also the
3004 following options which are followed by a single message id, and which
3005 act on that message. Some of them use the "recipient" addresses as well.
3006 -Mar add recipient(s)
3007 -MG move to a different queue
3008 -Mmad mark all recipients delivered
3009 -Mmd mark recipients(s) delivered
3011 -Mset load a message for use with -be
3013 -Mvc show copy (of whole message, in RFC 2822 format)
3020 msg_action = MSG_DELIVER;
3021 forced_delivery = f.deliver_force_thaw = TRUE;
3023 else if (Ustrcmp(argrest, "ar") == 0)
3025 msg_action = MSG_ADD_RECIPIENT;
3026 one_msg_action = TRUE;
3028 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3029 else if (Ustrcmp(argrest, "es") == 0)
3031 msg_action = MSG_EDIT_SENDER;
3032 one_msg_action = TRUE;
3034 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3035 else if (Ustrcmp(argrest, "g") == 0)
3037 msg_action = MSG_DELIVER;
3038 deliver_give_up = TRUE;
3040 else if (Ustrcmp(argrest, "G") == 0)
3042 msg_action = MSG_SETQUEUE;
3043 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
3045 else if (Ustrcmp(argrest, "mad") == 0)
3047 msg_action = MSG_MARK_ALL_DELIVERED;
3049 else if (Ustrcmp(argrest, "md") == 0)
3051 msg_action = MSG_MARK_DELIVERED;
3052 one_msg_action = TRUE;
3054 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3055 else if (Ustrcmp(argrest, "set") == 0)
3057 msg_action = MSG_LOAD;
3058 one_msg_action = TRUE;
3060 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3061 else if (Ustrcmp(argrest, "vb") == 0)
3063 msg_action = MSG_SHOW_BODY;
3064 one_msg_action = TRUE;
3066 else if (Ustrcmp(argrest, "vc") == 0)
3068 msg_action = MSG_SHOW_COPY;
3069 one_msg_action = TRUE;
3071 else if (Ustrcmp(argrest, "vh") == 0)
3073 msg_action = MSG_SHOW_HEADER;
3074 one_msg_action = TRUE;
3076 else if (Ustrcmp(argrest, "vl") == 0)
3078 msg_action = MSG_SHOW_LOG;
3079 one_msg_action = TRUE;
3081 else { badarg = TRUE; break; }
3083 /* All the -Mxx options require at least one message id. */
3085 msg_action_arg = i + 1;
3086 if (msg_action_arg >= argc)
3087 exim_fail("exim: no message ids given after %s option\n", arg);
3089 /* Some require only message ids to follow */
3091 if (!one_msg_action)
3093 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3094 exim_fail("exim: malformed message id %s after %s option\n",
3096 goto END_ARG; /* Remaining args are ids */
3099 /* Others require only one message id, possibly followed by addresses,
3100 which will be handled as normal arguments. */
3104 if (!mac_ismsgid(argv[msg_action_arg]))
3105 exim_fail("exim: malformed message id %s after %s option\n",
3106 argv[msg_action_arg], arg);
3112 /* Some programs seem to call the -om option without the leading o;
3113 for sendmail it askes for "me too". Exim always does this. */
3116 if (*argrest) badarg = TRUE;
3120 /* -N: don't do delivery - a debugging option that stops transports doing
3121 their thing. It implies debugging at the D_v level. */
3126 f.dont_deliver = TRUE;
3127 debug_selector |= D_v;
3128 debug_file = stderr;
3134 /* -n: This means "don't alias" in sendmail, apparently.
3135 For normal invocations, it has no effect.
3136 It may affect some other options. */
3142 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3143 option to the specified value. This form uses long names. We need to handle
3144 -O option=value and -Ooption=value. */
3149 exim_fail("exim: string expected after -O\n");
3155 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3158 if (!*(alias_arg = argrest))
3159 if (i+1 < argc) alias_arg = argv[++i];
3160 else exim_fail("exim: string expected after -oA\n");
3163 /* -oB: Set a connection message max value for remote deliveries */
3166 uschar * p = argrest;
3168 if (i+1 < argc && isdigit((argv[i+1][0])))
3172 connection_max_messages = 1;
3179 exim_fail("exim: number expected after -oB\n");
3180 connection_max_messages = Uatoi(p);
3185 /* -odb: background delivery */
3188 if (Ustrcmp(argrest, "b") == 0)
3190 f.synchronous_delivery = FALSE;
3191 arg_queue_only = FALSE;
3192 queue_only_set = TRUE;
3195 /* -odd: testsuite-only: add no inter-process delays */
3197 else if (Ustrcmp(argrest, "d") == 0)
3198 f.testsuite_delays = FALSE;
3200 /* -odf: foreground delivery (smail-compatible option); same effect as
3201 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3204 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3206 f.synchronous_delivery = TRUE;
3207 arg_queue_only = FALSE;
3208 queue_only_set = TRUE;
3211 /* -odq: queue only */
3213 else if (Ustrcmp(argrest, "q") == 0)
3215 f.synchronous_delivery = FALSE;
3216 arg_queue_only = TRUE;
3217 queue_only_set = TRUE;
3220 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3221 but no remote delivery */
3223 else if (Ustrcmp(argrest, "qs") == 0)
3225 f.queue_smtp = TRUE;
3226 arg_queue_only = FALSE;
3227 queue_only_set = TRUE;
3232 /* -oex: Sendmail error flags. As these are also accepted without the
3233 leading -o prefix, for compatibility with vacation and other callers,
3234 they are handled with -e above. */
3236 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3237 -oitrue: Another sendmail syntax for the same */
3240 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3245 /* -oM*: Set various characteristics for an incoming message; actually
3246 acted on for trusted callers only. */
3251 exim_fail("exim: data expected after -oM%s\n", argrest);
3253 /* -oMa: Set sender host address */
3255 if (Ustrcmp(argrest, "a") == 0)
3256 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3258 /* -oMaa: Set authenticator name */
3260 else if (Ustrcmp(argrest, "aa") == 0)
3261 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3263 /* -oMas: setting authenticated sender */
3265 else if (Ustrcmp(argrest, "as") == 0)
3266 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3268 /* -oMai: setting authenticated id */
3270 else if (Ustrcmp(argrest, "ai") == 0)
3271 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3273 /* -oMi: Set incoming interface address */
3275 else if (Ustrcmp(argrest, "i") == 0)
3276 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3278 /* -oMm: Message reference */
3280 else if (Ustrcmp(argrest, "m") == 0)
3282 if (!mac_ismsgid(argv[i+1]))
3283 exim_fail("-oMm must be a valid message ID\n");
3284 if (!f.trusted_config)
3285 exim_fail("-oMm must be called by a trusted user/config\n");
3286 message_reference = argv[++i];
3289 /* -oMr: Received protocol */
3291 else if (Ustrcmp(argrest, "r") == 0)
3293 if (received_protocol)
3294 exim_fail("received_protocol is set already\n");
3296 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3298 /* -oMs: Set sender host name */
3300 else if (Ustrcmp(argrest, "s") == 0)
3301 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3303 /* -oMt: Set sender ident */
3305 else if (Ustrcmp(argrest, "t") == 0)
3307 sender_ident_set = TRUE;
3308 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3311 /* Else a bad argument */
3318 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3319 seem to call this as -m (undocumented), so that is also accepted (see
3321 /* -oo: An ancient flag for old-style addresses which still seems to
3322 crop up in some calls (see in SCO). */
3326 if (*argrest) badarg = TRUE;
3329 /* -oP <name>: set pid file path for daemon
3330 -oPX: delete pid file of daemon */
3333 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3334 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3335 "(uid=%d euid=%d | %d)\n",
3336 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3337 if (!*argrest) override_pid_file_path = argv[++i];
3338 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3343 /* -or <n>: set timeout for non-SMTP acceptance
3344 -os <n>: set timeout for SMTP acceptance */
3349 int * tp = argrest[-1] == 'r'
3350 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3352 *tp = readconf_readtime(argrest, 0, FALSE);
3353 else if (i+1 < argc)
3354 *tp = readconf_readtime(argv[++i], 0, FALSE);
3357 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3361 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3362 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3365 if (*argrest) badarg = TRUE;
3366 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3369 /* -oY: Override creation of daemon notifier socket */
3372 if (*argrest) badarg = TRUE;
3373 else notifier_socket = NULL;
3376 /* Unknown -o argument */
3384 /* -ps: force Perl startup; -pd force delayed Perl startup */
3388 if (*argrest == 's' && argrest[1] == 0)
3390 perl_start_option = 1;
3393 if (*argrest == 'd' && argrest[1] == 0)
3395 perl_start_option = -1;
3400 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3401 which sets the host protocol and host name */
3404 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3408 uschar * hn = Ustrchr(argrest, ':');
3410 if (received_protocol)
3411 exim_fail("received_protocol is set already\n");
3414 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3417 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3418 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3419 sender_host_name = string_copy_taint(hn + 1, TRUE);
3426 receiving_message = FALSE;
3427 if (queue_interval >= 0)
3428 exim_fail("exim: -q specified more than once\n");
3430 /* -qq...: Do queue runs in a 2-stage manner */
3432 if (*argrest == 'q')
3434 f.queue_2stage = TRUE;
3438 /* -qi...: Do only first (initial) deliveries */
3440 if (*argrest == 'i')
3442 f.queue_run_first_delivery = TRUE;
3446 /* -qf...: Run the queue, forcing deliveries
3447 -qff..: Ditto, forcing thawing as well */
3449 if (*argrest == 'f')
3451 f.queue_run_force = TRUE;
3452 if (*++argrest == 'f')
3454 f.deliver_force_thaw = TRUE;
3459 /* -q[f][f]l...: Run the queue only on local deliveries */
3461 if (*argrest == 'l')
3463 f.queue_run_local = TRUE;
3467 /* -q[f][f][l][G<name>]... Work on the named queue */
3469 if (*argrest == 'G')
3472 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3473 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3474 queue_name = string_copyn(argrest, i);
3476 if (*argrest == '/') argrest++;
3479 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3480 only, optionally named, optionally starting from a given message id. */
3482 if (!(list_queue || count_queue))
3484 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3487 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3488 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3489 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3490 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3493 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3494 forced, optionally local only, optionally named. */
3496 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3498 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3502 case 'R': /* Synonymous with -qR... */
3504 const uschar *tainted_selectstr;
3506 receiving_message = FALSE;
3508 /* -Rf: As -R (below) but force all deliveries,
3509 -Rff: Ditto, but also thaw all frozen messages,
3510 -Rr: String is regex
3511 -Rrf: Regex and force
3512 -Rrff: Regex and force and thaw
3514 in all cases provided there are no further characters in this
3518 for (int i = 0; i < nelem(rsopts); i++)
3519 if (Ustrcmp(argrest, rsopts[i]) == 0)
3521 if (i != 2) f.queue_run_force = TRUE;
3522 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3523 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3524 argrest += Ustrlen(rsopts[i]);
3527 /* -R: Set string to match in addresses for forced queue run to
3528 pick out particular messages. */
3530 /* Avoid attacks from people providing very long strings, and do so before
3533 tainted_selectstr = argrest;
3534 else if (i+1 < argc)
3535 tainted_selectstr = argv[++i];
3537 exim_fail("exim: string expected after -R\n");
3538 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3542 /* -r: an obsolete synonym for -f (see above) */
3545 /* -S: Like -R but works on sender. */
3547 case 'S': /* Synonymous with -qS... */
3549 const uschar *tainted_selectstr;
3551 receiving_message = FALSE;
3553 /* -Sf: As -S (below) but force all deliveries,
3554 -Sff: Ditto, but also thaw all frozen messages,
3555 -Sr: String is regex
3556 -Srf: Regex and force
3557 -Srff: Regex and force and thaw
3559 in all cases provided there are no further characters in this
3563 for (int i = 0; i < nelem(rsopts); i++)
3564 if (Ustrcmp(argrest, rsopts[i]) == 0)
3566 if (i != 2) f.queue_run_force = TRUE;
3567 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3568 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3569 argrest += Ustrlen(rsopts[i]);
3572 /* -S: Set string to match in addresses for forced queue run to
3573 pick out particular messages. */
3576 tainted_selectstr = argrest;
3577 else if (i+1 < argc)
3578 tainted_selectstr = argv[++i];
3580 exim_fail("exim: string expected after -S\n");
3581 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3585 /* -Tqt is an option that is exclusively for use by the testing suite.
3586 It is not recognized in other circumstances. It allows for the setting up
3587 of explicit "queue times" so that various warning/retry things can be
3588 tested. Otherwise variability of clock ticks etc. cause problems. */
3591 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3592 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3597 /* -t: Set flag to extract recipients from body of message. */
3600 if (!*argrest) extract_recipients = TRUE;
3602 /* -ti: Set flag to extract recipients from body of message, and also
3603 specify that dot does not end the message. */
3605 else if (Ustrcmp(argrest, "i") == 0)
3607 extract_recipients = TRUE;
3611 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3614 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3621 /* -U: This means "initial user submission" in sendmail, apparently. The
3622 doc claims that in future sendmail may refuse syntactically invalid
3623 messages instead of fixing them. For the moment, we just ignore it. */
3629 /* -v: verify things - this is a very low-level debugging */
3634 debug_selector |= D_v;
3635 debug_file = stderr;
3641 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3643 The -x flag tells the sendmail command that mail from a local
3644 mail program has National Language Support (NLS) extended characters
3645 in the body of the mail item. The sendmail command can send mail with
3646 extended NLS characters across networks that normally corrupts these
3649 As Exim is 8-bit clean, it just ignores this flag. */
3652 if (*argrest) badarg = TRUE;
3655 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3656 logs to that file. We swallow the parameter and otherwise ignore it. */
3661 exim_fail("exim: string expected after -X\n");
3664 /* -z: a line of text to log */
3669 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3671 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3674 /* All other initial characters are errors */
3679 } /* End of high-level switch statement */
3681 /* Failed to recognize the option, or syntax error */
3684 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3685 "option %s\n", arg);
3689 /* If -R or -S have been specified without -q, assume a single queue run. */
3691 if ( (deliver_selectstring || deliver_selectstring_sender)
3692 && queue_interval < 0)
3697 store_pool = old_pool;
3700 /* If usage_wanted is set we call the usage function - which never returns */
3701 if (usage_wanted) exim_usage(called_as);
3703 /* Arguments have been processed. Check for incompatibilities. */
3704 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3705 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3706 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3707 || filter_test != FTEST_NONE
3708 || msg_action_arg > 0 && !one_msg_action
3710 || ( msg_action_arg > 0
3711 && ( f.daemon_listen || queue_interval > 0 || list_options
3712 || checking && msg_action != MSG_LOAD
3713 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3715 || ( (f.daemon_listen || queue_interval > 0)
3716 && ( sender_address || list_options || list_queue || checking
3719 || f.daemon_listen && queue_interval == 0
3720 || f.inetd_wait_mode && queue_interval >= 0
3722 && ( checking || smtp_input || extract_recipients
3723 || filter_test != FTEST_NONE || bi_option
3725 || ( verify_address_mode
3726 && ( f.address_test_mode || smtp_input || extract_recipients
3727 || filter_test != FTEST_NONE || bi_option
3729 || ( f.address_test_mode
3730 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3734 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3736 || deliver_selectstring && queue_interval < 0
3737 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3739 exim_fail("exim: incompatible command-line options or arguments\n");
3741 /* If debugging is set up, set the file and the file descriptor to pass on to
3742 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3743 to run in the foreground. */
3745 if (debug_selector != 0)
3747 debug_file = stderr;
3748 debug_fd = fileno(debug_file);
3749 f.background_daemon = FALSE;
3750 testharness_pause_ms(100); /* lets caller finish */
3751 if (debug_selector != D_v) /* -v only doesn't show this */
3753 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3754 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3756 if (!version_printed)
3757 show_whats_supported(stderr);
3761 /* When started with root privilege, ensure that the limits on the number of
3762 open files and the number of processes (where that is accessible) are
3763 sufficiently large, or are unset, in case Exim has been called from an
3764 environment where the limits are screwed down. Not all OS have the ability to
3765 change some of these limits. */
3769 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3775 #ifdef RLIMIT_NOFILE
3776 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3778 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3780 rlp.rlim_cur = rlp.rlim_max = 0;
3783 /* I originally chose 1000 as a nice big number that was unlikely to
3784 be exceeded. It turns out that some older OS have a fixed upper limit of
3787 if (rlp.rlim_cur < 1000)
3789 rlp.rlim_cur = rlp.rlim_max = 1000;
3790 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3792 rlp.rlim_cur = rlp.rlim_max = 256;
3793 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3794 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3801 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3803 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3805 rlp.rlim_cur = rlp.rlim_max = 0;
3808 # ifdef RLIM_INFINITY
3809 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3811 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3813 if (rlp.rlim_cur < 1000)
3815 rlp.rlim_cur = rlp.rlim_max = 1000;
3817 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3818 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3824 /* Exim is normally entered as root (but some special configurations are
3825 possible that don't do this). However, it always spins off sub-processes that
3826 set their uid and gid as required for local delivery. We don't want to pass on
3827 any extra groups that root may belong to, so we want to get rid of them all at
3830 We need to obey setgroups() at this stage, before possibly giving up root
3831 privilege for a changed configuration file, but later on we might need to
3832 check on the additional groups for the admin user privilege - can't do that
3833 till after reading the config, which might specify the exim gid. Therefore,
3834 save the group list here first. */
3836 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3837 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3839 /* There is a fundamental difference in some BSD systems in the matter of
3840 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3841 known not to be different. On the "different" systems there is a single group
3842 list, and the first entry in it is the current group. On all other versions of
3843 Unix there is a supplementary group list, which is in *addition* to the current
3844 group. Consequently, to get rid of all extraneous groups on a "standard" system
3845 you pass over 0 groups to setgroups(), while on a "different" system you pass
3846 over a single group - the current group, which is always the first group in the
3847 list. Calling setgroups() with zero groups on a "different" system results in
3848 an error return. The following code should cope with both types of system.
3850 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3851 the "setgroups() with zero groups" - and changes the egid.
3852 Thanks to that we had to stash the original_egid above, for use below
3853 in the call to exim_setugid().
3855 However, if this process isn't running as root, setgroups() can't be used
3856 since you have to be root to run it, even if throwing away groups.
3857 Except, sigh, for Hurd - where you can.
3858 Not being root here happens only in some unusual configurations. */
3861 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3862 && setgroups(0, NULL) != 0
3864 && setgroups(1, group_list) != 0)
3865 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3867 /* If the configuration file name has been altered by an argument on the
3868 command line (either a new file name or a macro definition) and the caller is
3869 not root, or if this is a filter testing run, remove any setuid privilege the
3870 program has and run as the underlying user.
3872 The exim user is locked out of this, which severely restricts the use of -C
3875 Otherwise, set the real ids to the effective values (should be root unless run
3876 from inetd, which it can either be root or the exim uid, if one is configured).
3878 There is a private mechanism for bypassing some of this, in order to make it
3879 possible to test lots of configurations automatically, without having either to
3880 recompile each time, or to patch in an actual configuration file name and other
3881 values (such as the path name). If running in the test harness, pretend that
3882 configuration file changes and macro definitions haven't happened. */
3885 (!f.trusted_config || /* Config changed, or */
3886 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3887 real_uid != root_uid && /* Not root, and */
3888 !f.running_in_test_harness /* Not fudged */
3890 expansion_test /* expansion testing */
3892 filter_test != FTEST_NONE) /* Filter testing */
3894 setgroups(group_count, group_list);
3895 exim_setugid(real_uid, real_gid, FALSE,
3896 US"-C, -D, -be or -bf forces real uid");
3897 removed_privilege = TRUE;
3899 /* In the normal case when Exim is called like this, stderr is available
3900 and should be used for any logging information because attempts to write
3901 to the log will usually fail. To arrange this, we unset really_exim. However,
3902 if no stderr is available there is no point - we might as well have a go
3903 at the log (if it fails, syslog will be written).
3905 Note that if the invoker is Exim, the logs remain available. Messing with
3906 this causes unlogged successful deliveries. */
3908 if (log_stderr && real_uid != exim_uid)
3909 f.really_exim = FALSE;
3912 /* Privilege is to be retained for the moment. It may be dropped later,
3913 depending on the job that this Exim process has been asked to do. For now, set
3914 the real uid to the effective so that subsequent re-execs of Exim are done by a
3918 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3920 /* If testing a filter, open the file(s) now, before wasting time doing other
3921 setups and reading the message. */
3923 if (filter_test & FTEST_SYSTEM)
3924 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3925 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3928 if (filter_test & FTEST_USER)
3929 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3930 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3933 /* Initialise lookup_list
3934 If debugging, already called above via version reporting.
3935 In either case, we initialise the list of available lookups while running
3936 as root. All dynamically modules are loaded from a directory which is
3937 hard-coded into the binary and is code which, if not a module, would be
3938 part of Exim already. Ability to modify the content of the directory
3939 is equivalent to the ability to modify a setuid binary!
3941 This needs to happen before we read the main configuration. */
3944 /*XXX this excrescence could move to the testsuite standard config setup file */
3946 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3949 /* Read the main runtime configuration data; this gives up if there
3950 is a failure. It leaves the configuration file open so that the subsequent
3951 configuration data for delivery can be read if needed.
3953 NOTE: immediately after opening the configuration file we change the working
3954 directory to "/"! Later we change to $spool_directory. We do it there, because
3955 during readconf_main() some expansion takes place already. */
3957 /* Store the initial cwd before we change directories. Can be NULL if the
3958 dir has already been unlinked. */
3959 initial_cwd = os_getcwd(NULL, 0);
3960 if (!initial_cwd && errno)
3961 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
3963 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
3964 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
3967 -be[m] expansion test -
3968 -b[fF] filter test new
3970 -bmalware malware_test_file new
3972 -brw rewrite test new
3974 -bv[s] address verify -
3976 -bP <option> (except -bP config, which sets list_config)
3978 If any of these options is set, we suppress warnings about configuration
3979 issues (currently about tls_advertise_hosts and keep_environment not being
3983 int old_pool = store_pool;
3984 #ifdef MEASURE_TIMING
3985 struct timeval t0, diff;
3986 (void)gettimeofday(&t0, NULL);
3989 store_pool = POOL_CONFIG;
3990 readconf_main(checking || list_options);
3991 store_pool = old_pool;
3993 #ifdef MEASURE_TIMING
3994 report_time_since(&t0, US"readconf_main (delta)");
3998 /* Now in directory "/" */
4000 if (cleanup_environment() == FALSE)
4001 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4004 /* If an action on specific messages is requested, or if a daemon or queue
4005 runner is being started, we need to know if Exim was called by an admin user.
4006 This is the case if the real user is root or exim, or if the real group is
4007 exim, or if one of the supplementary groups is exim or a group listed in
4008 admin_groups. We don't fail all message actions immediately if not admin_user,
4009 since some actions can be performed by non-admin users. Instead, set admin_user
4010 for later interrogation. */
4012 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4013 f.admin_user = TRUE;
4015 for (int i = 0; i < group_count && !f.admin_user; i++)
4016 if (group_list[i] == exim_gid)
4017 f.admin_user = TRUE;
4018 else if (admin_groups)
4019 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4020 if (admin_groups[j] == group_list[i])
4021 f.admin_user = TRUE;
4023 /* Another group of privileged users are the trusted users. These are root,
4024 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4025 are permitted to specify sender_addresses with -f on the command line, and
4026 other message parameters as well. */
4028 if (real_uid == root_uid || real_uid == exim_uid)
4029 f.trusted_caller = TRUE;
4033 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4034 if (trusted_users[i] == real_uid)
4035 f.trusted_caller = TRUE;
4038 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4039 if (trusted_groups[i] == real_gid)
4040 f.trusted_caller = TRUE;
4041 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4042 if (trusted_groups[i] == group_list[j])
4043 f.trusted_caller = TRUE;
4046 /* At this point, we know if the user is privileged and some command-line
4047 options become possibly impermissible, depending upon the configuration file. */
4049 if (checking && commandline_checks_require_admin && !f.admin_user)
4050 exim_fail("exim: those command-line flags are set to require admin\n");
4052 /* Handle the decoding of logging options. */
4054 decode_bits(log_selector, log_selector_size, log_notall,
4055 log_selector_string, log_options, log_options_count, US"log", 0);
4059 debug_printf("configuration file is %s\n", config_main_filename);
4060 debug_printf("log selectors =");
4061 for (int i = 0; i < log_selector_size; i++)
4062 debug_printf(" %08x", log_selector[i]);
4066 /* If domain literals are not allowed, check the sender address that was
4067 supplied with -f. Ditto for a stripped trailing dot. */
4071 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4072 exim_fail("exim: bad -f address \"%s\": domain literals not "
4073 "allowed\n", sender_address);
4074 if (f_end_dot && !strip_trailing_dot)
4075 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4076 "(trailing dot not allowed)\n", sender_address);
4079 /* See if an admin user overrode our logging. */
4081 if (cmdline_syslog_name)
4084 syslog_processname = cmdline_syslog_name;
4085 log_file_path = string_copy(CUS"syslog");
4088 /* not a panic, non-privileged users should not be able to spam paniclog */
4090 "exim: you lack sufficient privilege to specify syslog process name\n");
4092 /* Paranoia check of maximum lengths of certain strings. There is a check
4093 on the length of the log file path in log.c, which will come into effect
4094 if there are any calls to write the log earlier than this. However, if we
4095 get this far but the string is very long, it is better to stop now than to
4096 carry on and (e.g.) receive a message and then have to collapse. The call to
4097 log_write() from here will cause the ultimate panic collapse if the complete
4098 file name exceeds the buffer length. */
4100 if (Ustrlen(log_file_path) > 200)
4101 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4102 "log_file_path is longer than 200 chars: aborting");
4104 if (Ustrlen(pid_file_path) > 200)
4105 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4106 "pid_file_path is longer than 200 chars: aborting");
4108 if (Ustrlen(spool_directory) > 200)
4109 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4110 "spool_directory is longer than 200 chars: aborting");
4112 /* Length check on the process name given to syslog for its TAG field,
4113 which is only permitted to be 32 characters or less. See RFC 3164. */
4115 if (Ustrlen(syslog_processname) > 32)
4116 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4117 "syslog_processname is longer than 32 chars: aborting");
4122 log_write(0, LOG_MAIN, "%s", log_oneline);
4123 return EXIT_SUCCESS;
4126 return EXIT_FAILURE;
4128 /* In some operating systems, the environment variable TMPDIR controls where
4129 temporary files are created; Exim doesn't use these (apart from when delivering
4130 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4131 If TMPDIR is found in the environment, reset it to the value defined in the
4132 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4133 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4134 EXIM_TMPDIR by the build scripts.
4138 if (environ) for (uschar ** p = USS environ; *p; p++)
4139 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4141 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4142 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4144 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4148 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4149 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4150 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4151 called by a user who has set the TZ variable. This then affects the timestamps
4152 in log files and in Received: headers, and any created Date: header lines. The
4153 required timezone is settable in the configuration file, so nothing can be done
4154 about this earlier - but hopefully nothing will normally be logged earlier than
4155 this. We have to make a new environment if TZ is wrong, but don't bother if
4156 timestamps_utc is set, because then all times are in UTC anyway. */
4158 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4159 f.timestamps_utc = TRUE;
4162 uschar *envtz = US getenv("TZ");
4164 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4165 : timezone_string != NULL
4168 uschar **p = USS environ;
4172 if (environ) while (*p++) count++;
4173 if (!envtz) count++;
4174 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4175 if (environ) for (p = USS environ; *p; p++)
4176 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4177 if (timezone_string)
4179 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4180 sprintf(CS *newp++, "TZ=%s", timezone_string);
4185 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4186 tod_stamp(tod_log));
4190 /* Handle the case when we have removed the setuid privilege because of -C or
4191 -D. This means that the caller of Exim was not root.
4193 There is a problem if we were running as the Exim user. The sysadmin may
4194 expect this case to retain privilege because "the binary was called by the
4195 Exim user", but it hasn't, because either the -D option set macros, or the
4196 -C option set a non-trusted configuration file. There are two possibilities:
4198 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4199 to do message deliveries. Thus, the fact that it is running as a
4200 non-privileged user is plausible, and might be wanted in some special
4201 configurations. However, really_exim will have been set false when
4202 privilege was dropped, to stop Exim trying to write to its normal log
4203 files. Therefore, re-enable normal log processing, assuming the sysadmin
4204 has set up the log directory correctly.
4206 (2) If deliver_drop_privilege is not set, the configuration won't work as
4207 apparently intended, and so we log a panic message. In order to retain
4208 root for -C or -D, the caller must either be root or be invoking a
4209 trusted configuration file (when deliver_drop_privilege is false). */
4211 if ( removed_privilege
4212 && (!f.trusted_config || opt_D_used)
4213 && real_uid == exim_uid)
4214 if (deliver_drop_privilege)
4215 f.really_exim = TRUE; /* let logging work normally */
4217 log_write(0, LOG_MAIN|LOG_PANIC,
4218 "exim user lost privilege for using %s option",
4219 f.trusted_config? "-D" : "-C");
4221 /* Start up Perl interpreter if Perl support is configured and there is a
4222 perl_startup option, and the configuration or the command line specifies
4223 initializing starting. Note that the global variables are actually called
4224 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4227 if (perl_start_option != 0)
4228 opt_perl_at_start = (perl_start_option > 0);
4229 if (opt_perl_at_start && opt_perl_startup != NULL)
4232 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4233 if ((errstr = init_perl(opt_perl_startup)))
4234 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4235 opt_perl_started = TRUE;
4237 #endif /* EXIM_PERL */
4239 /* Log the arguments of the call if the configuration file said so. This is
4240 a debugging feature for finding out what arguments certain MUAs actually use.
4241 Don't attempt it if logging is disabled, or if listing variables or if
4242 verifying/testing addresses or expansions. */
4244 if ( (debug_selector & D_any || LOGGING(arguments))
4245 && f.really_exim && !list_options && !checking)
4247 uschar *p = big_buffer;
4248 Ustrcpy(p, US"cwd= (failed)");
4255 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4256 p += Ustrlen(CCS p);
4259 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4261 for (int i = 0; i < argc; i++)
4263 int len = Ustrlen(argv[i]);
4264 const uschar *printing;
4266 if (p + len + 8 >= big_buffer + big_buffer_size)
4268 Ustrcpy(p, US" ...");
4269 log_write(0, LOG_MAIN, "%s", big_buffer);
4270 Ustrcpy(big_buffer, US"...");
4273 printing = string_printing(argv[i]);
4274 if (!*printing) quote = US"\"";
4277 const uschar *pp = printing;
4279 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4281 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4282 (p - big_buffer) - 4), printing, quote);
4285 if (LOGGING(arguments))
4286 log_write(0, LOG_MAIN, "%s", big_buffer);
4288 debug_printf("%s\n", big_buffer);
4291 /* Set the working directory to be the top-level spool directory. We don't rely
4292 on this in the code, which always uses fully qualified names, but it's useful
4293 for core dumps etc. Don't complain if it fails - the spool directory might not
4294 be generally accessible and calls with the -C option (and others) have lost
4295 privilege by now. Before the chdir, we try to ensure that the directory exists.
4298 if (Uchdir(spool_directory) != 0)
4300 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4301 (void) Uchdir(spool_directory);
4304 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4305 alias file. Exim doesn't have such a concept, but this call is screwed into
4306 Sun's YP makefiles. Handle this by calling a configured script, as the real
4307 user who called Exim. The -oA option can be used to pass an argument to the
4312 (void) fclose(config_file);
4313 if (bi_command && *bi_command)
4317 argv[i++] = bi_command;
4318 if (alias_arg) argv[i++] = alias_arg;
4321 setgroups(group_count, group_list);
4322 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4324 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4325 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4327 execv(CS argv[0], (char *const *)argv);
4328 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4332 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4337 /* We moved the admin/trusted check to be immediately after reading the
4338 configuration file. We leave these prints here to ensure that syslog setup,
4339 logfile setup, and so on has already happened. */
4341 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4342 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4344 /* Only an admin user may start the daemon or force a queue run in the default
4345 configuration, but the queue run restriction can be relaxed. Only an admin
4346 user may request that a message be returned to its sender forthwith. Only an
4347 admin user may specify a debug level greater than D_v (because it might show
4348 passwords, etc. in lookup queries). Only an admin user may request a queue
4349 count. Only an admin user can use the test interface to scan for email
4350 (because Exim will be in the spool dir and able to look at mails). */
4354 BOOL debugset = (debug_selector & ~D_v) != 0;
4355 if ( deliver_give_up || f.daemon_listen || malware_test_file
4356 || count_queue && queue_list_requires_admin
4357 || list_queue && queue_list_requires_admin
4358 || queue_interval >= 0 && prod_requires_admin
4359 || queue_name_dest && prod_requires_admin
4360 || debugset && !f.running_in_test_harness
4362 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4365 /* If the real user is not root or the exim uid, the argument for passing
4366 in an open TCP/IP connection for another message is not permitted, nor is
4367 running with the -N option for any delivery action, unless this call to exim is
4368 one that supplied an input message, or we are using a patched exim for
4369 regression testing. */
4371 if ( real_uid != root_uid && real_uid != exim_uid
4372 && ( continue_hostname
4374 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4376 && !f.running_in_test_harness
4378 exim_fail("exim: Permission denied\n");
4380 /* If the caller is not trusted, certain arguments are ignored when running for
4381 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4382 Note that authority for performing certain actions on messages is tested in the
4383 queue_action() function. */
4385 if (!f.trusted_caller && !checking)
4387 sender_host_name = sender_host_address = interface_address =
4388 sender_ident = received_protocol = NULL;
4389 sender_host_port = interface_port = 0;
4390 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4393 /* If a sender host address is set, extract the optional port number off the
4394 end of it and check its syntax. Do the same thing for the interface address.
4395 Exim exits if the syntax is bad. */
4399 if (sender_host_address)
4400 sender_host_port = check_port(sender_host_address);
4401 if (interface_address)
4402 interface_port = check_port(interface_address);
4405 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4408 if (f.trusted_caller)
4410 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4411 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4414 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4417 /* If an SMTP message is being received check to see if the standard input is a
4418 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4419 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4424 union sockaddr_46 inetd_sock;
4425 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4426 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4428 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4429 if (family == AF_INET || family == AF_INET6)
4431 union sockaddr_46 interface_sock;
4432 size = sizeof(interface_sock);
4434 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4435 interface_address = host_ntoa(-1, &interface_sock, NULL,
4438 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4440 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4443 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4444 NULL, &sender_host_port);
4445 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4446 "inetd is not supported when mua_wrapper is set");
4450 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4455 /* If the load average is going to be needed while receiving a message, get it
4456 now for those OS that require the first call to os_getloadavg() to be done as
4457 root. There will be further calls later for each message received. */
4459 #ifdef LOAD_AVG_NEEDS_ROOT
4460 if ( receiving_message
4461 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4462 load_average = OS_GETLOADAVG();
4465 /* The queue_only configuration option can be overridden by -odx on the command
4466 line, except that if queue_only_override is false, queue_only cannot be unset
4467 from the command line. */
4469 if (queue_only_set && (queue_only_override || arg_queue_only))
4470 queue_only = arg_queue_only;
4472 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4475 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4476 if (arg_smtp_receive_timeout >= 0)
4477 smtp_receive_timeout = arg_smtp_receive_timeout;
4479 /* If Exim was started with root privilege, unless we have already removed the
4480 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4481 except when starting the daemon or doing some kind of delivery or address
4482 testing (-bt). These are the only cases when root need to be retained. We run
4483 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4484 retained only for starting the daemon. We always do the initgroups() in this
4485 situation (controlled by the TRUE below), in order to be as close as possible
4486 to the state Exim usually runs in. */
4488 if ( !unprivileged /* originally had root AND */
4489 && !removed_privilege /* still got root AND */
4490 && !f.daemon_listen /* not starting the daemon */
4491 && queue_interval <= 0 /* (either kind of daemon) */
4492 && ( /* AND EITHER */
4493 deliver_drop_privilege /* requested unprivileged */
4495 queue_interval < 0 /* not running the queue */
4496 && ( msg_action_arg < 0 /* and */
4497 || msg_action != MSG_DELIVER /* not delivering */
4499 && (!checking || !f.address_test_mode) /* not address checking */
4500 && !rcpt_verify_quota /* and not quota checking */
4502 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4504 /* When we are retaining a privileged uid, we still change to the exim gid. */
4509 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4510 rv = setgid(exim_gid);
4511 /* Impact of failure is that some stuff might end up with an incorrect group.
4512 We track this for failures from root, since any attempt to change privilege
4513 by root should succeed and failures should be examined. For non-root,
4514 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4515 no need to complain then. */
4517 if (!(unprivileged || removed_privilege))
4518 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4521 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4522 (long int)exim_gid, strerror(errno));
4526 /* Handle a request to scan a file for malware */
4527 if (malware_test_file)
4529 #ifdef WITH_CONTENT_SCAN
4531 set_process_info("scanning file for malware");
4532 if ((result = malware_in_file(malware_test_file)) == FAIL)
4534 printf("No malware found.\n");
4539 printf("Malware lookup returned non-okay/fail: %d\n", result);
4543 printf("Malware found: %s\n", malware_name);
4545 printf("Malware scan detected malware of unknown name.\n");
4547 printf("Malware scanning not enabled at compile time.\n");
4552 /* Handle a request to list the delivery queue */
4556 set_process_info("listing the queue");
4557 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4561 /* Handle a request to count the delivery queue */
4565 set_process_info("counting the queue");
4566 fprintf(stdout, "%u\n", queue_count());
4570 /* Handle actions on specific messages, except for the force delivery and
4571 message load actions, which are done below. Some actions take a whole list of
4572 message ids, which are known to continue up to the end of the arguments. Others
4573 take a single message id and then operate on the recipients list. */
4575 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4577 int yield = EXIT_SUCCESS;
4578 set_process_info("acting on specified messages");
4580 /* ACL definitions may be needed when removing a message (-Mrm) because
4581 event_action gets expanded */
4583 if (msg_action == MSG_REMOVE)
4585 int old_pool = store_pool;
4586 store_pool = POOL_CONFIG;
4588 store_pool = old_pool;
4589 store_writeprotect(POOL_CONFIG);
4592 if (!one_msg_action)
4594 for (i = msg_action_arg; i < argc; i++)
4595 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4596 yield = EXIT_FAILURE;
4599 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4600 default: printf("\n"); break;
4604 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4605 recipients_arg)) yield = EXIT_FAILURE;
4609 /* We used to set up here to skip reading the ACL section, on
4610 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4611 Now, since the intro of the ${acl } expansion, ACL definitions may be
4612 needed in transports so we lost the optimisation. */
4615 int old_pool = store_pool;
4616 #ifdef MEASURE_TIMING
4617 struct timeval t0, diff;
4618 (void)gettimeofday(&t0, NULL);
4621 store_pool = POOL_CONFIG;
4623 store_pool = old_pool;
4625 /* -be can add macro definitions, needing to link to the macro structure
4626 chain. Otherwise, make the memory used for config data readonly. */
4628 if (!expansion_test)
4629 store_writeprotect(POOL_CONFIG);
4631 #ifdef MEASURE_TIMING
4632 report_time_since(&t0, US"readconf_rest (delta)");
4636 /* Handle a request to check quota */
4637 if (rcpt_verify_quota)
4638 if (real_uid != root_uid && real_uid != exim_uid)
4639 exim_fail("exim: Permission denied\n");
4640 else if (recipients_arg >= argc)
4641 exim_fail("exim: missing recipient for quota check\n");
4644 verify_quota(argv[recipients_arg]);
4645 exim_exit(EXIT_SUCCESS);
4648 /* Handle the -brt option. This is for checking out retry configurations.
4649 The next three arguments are a domain name or a complete address, and
4650 optionally two error numbers. All it does is to call the function that
4651 scans the retry configuration data. */
4653 if (test_retry_arg >= 0)
4655 retry_config *yield;
4656 int basic_errno = 0;
4658 const uschar *s1, *s2;
4660 if (test_retry_arg >= argc)
4662 printf("-brt needs a domain or address argument\n");
4663 exim_exit(EXIT_FAILURE);
4665 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4668 /* If the first argument contains no @ and no . it might be a local user
4669 or it might be a single-component name. Treat as a domain. */
4671 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4673 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4674 "being \ntreated as a one-component domain, not as a local part.\n\n",
4678 /* There may be an optional second domain arg. */
4680 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4681 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4683 /* The final arg is an error name */
4685 if (test_retry_arg < argc)
4687 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4689 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4692 printf("%s\n", CS error);
4693 return EXIT_FAILURE;
4696 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4697 code > 100 as an error is for matching codes to the decade. Turn them into
4698 a real error code, off the decade. */
4700 if (basic_errno == ERRNO_MAIL4XX ||
4701 basic_errno == ERRNO_RCPT4XX ||
4702 basic_errno == ERRNO_DATA4XX)
4704 int code = (more_errno >> 8) & 255;
4706 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4707 else if (code > 100)
4708 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4712 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4713 printf("No retry information found\n");
4716 more_errno = yield->more_errno;
4717 printf("Retry rule: %s ", yield->pattern);
4719 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4721 printf("quota%s%s ",
4722 (more_errno > 0)? "_" : "",
4723 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4725 else if (yield->basic_errno == ECONNREFUSED)
4727 printf("refused%s%s ",
4728 (more_errno > 0)? "_" : "",
4729 (more_errno == 'M')? "MX" :
4730 (more_errno == 'A')? "A" : "");
4732 else if (yield->basic_errno == ETIMEDOUT)
4735 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4737 if (more_errno != 0) printf("_%s",
4738 (more_errno == 'M')? "MX" : "A");
4741 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4742 printf("auth_failed ");
4745 for (retry_rule * r = yield->rules; r; r = r->next)
4747 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4748 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4754 printf(",%d.", x/1000);
4768 exim_exit(EXIT_SUCCESS);
4771 /* Handle a request to list one or more configuration options */
4772 /* If -n was set, we suppress some information */
4777 set_process_info("listing variables");
4778 if (recipients_arg >= argc)
4779 fail = !readconf_print(US"all", NULL, flag_n);
4780 else for (i = recipients_arg; i < argc; i++)
4783 (Ustrcmp(argv[i], "router") == 0 ||
4784 Ustrcmp(argv[i], "transport") == 0 ||
4785 Ustrcmp(argv[i], "authenticator") == 0 ||
4786 Ustrcmp(argv[i], "macro") == 0 ||
4787 Ustrcmp(argv[i], "environment") == 0))
4789 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4793 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4795 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4800 set_process_info("listing config");
4801 exim_exit(readconf_print(US"config", NULL, flag_n)
4802 ? EXIT_SUCCESS : EXIT_FAILURE);
4806 /* Initialise subsystems as required. */
4810 /* Handle a request to deliver one or more messages that are already on the
4811 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4812 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4814 Delivery of specific messages is typically used for a small number when
4815 prodding by hand (when the option forced_delivery will be set) or when
4816 re-execing to regain root privilege. Each message delivery must happen in a
4817 separate process, so we fork a process for each one, and run them sequentially
4818 so that debugging output doesn't get intertwined, and to avoid spawning too
4819 many processes if a long list is given. However, don't fork for the last one;
4820 this saves a process in the common case when Exim is called to deliver just one
4823 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4825 if (prod_requires_admin && !f.admin_user)
4827 fprintf(stderr, "exim: Permission denied\n");
4828 exim_exit(EXIT_FAILURE);
4830 set_process_info("delivering specified messages");
4831 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4832 for (i = msg_action_arg; i < argc; i++)
4836 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4837 that runs into a later copy into the untainted global message_id[] */
4838 /*XXX Do we need a length limit check here? */
4840 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4841 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4843 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4844 exim_underbar_exit(EXIT_SUCCESS);
4848 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4850 exim_exit(EXIT_FAILURE);
4854 exim_exit(EXIT_SUCCESS);
4858 /* If only a single queue run is requested, without SMTP listening, we can just
4859 turn into a queue runner, with an optional starting message id. */
4861 if (queue_interval == 0 && !f.daemon_listen)
4863 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4864 start_queue_run_id ? US" starting at " : US"",
4865 start_queue_run_id ? start_queue_run_id: US"",
4866 stop_queue_run_id ? US" stopping at " : US"",
4867 stop_queue_run_id ? stop_queue_run_id : US"");
4869 set_process_info("running the '%s' queue (single queue run)", queue_name);
4871 set_process_info("running the queue (single queue run)");
4872 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4873 exim_exit(EXIT_SUCCESS);
4877 /* Find the login name of the real user running this process. This is always
4878 needed when receiving a message, because it is written into the spool file. It
4879 may also be used to construct a from: or a sender: header, and in this case we
4880 need the user's full name as well, so save a copy of it, checked for RFC822
4881 syntax and munged if necessary, if it hasn't previously been set by the -F
4882 argument. We may try to get the passwd entry more than once, in case NIS or
4883 other delays are in evidence. Save the home directory for use in filter testing
4888 if ((pw = getpwuid(real_uid)) != NULL)
4890 originator_login = string_copy(US pw->pw_name);
4891 originator_home = string_copy(US pw->pw_dir);
4893 /* If user name has not been set by -F, set it from the passwd entry
4894 unless -f has been used to set the sender address by a trusted user. */
4896 if (!originator_name)
4898 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4900 uschar *name = US pw->pw_gecos;
4901 uschar *amp = Ustrchr(name, '&');
4904 /* Most Unix specify that a '&' character in the gecos field is
4905 replaced by a copy of the login name, and some even specify that
4906 the first character should be upper cased, so that's what we do. */
4911 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4912 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4913 buffer[loffset] = toupper(buffer[loffset]);
4917 /* If a pattern for matching the gecos field was supplied, apply
4918 it and then expand the name string. */
4920 if (gecos_pattern && gecos_name)
4922 const pcre2_code *re;
4923 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4925 if (regex_match_and_setup(re, name, 0, -1))
4927 uschar *new_name = expand_string(gecos_name);
4931 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4932 "gecos field \"%s\"\n", new_name, name);
4935 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4936 "\"%s\": %s\n", gecos_name, expand_string_message);
4938 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4939 "gecos field \"%s\"\n", gecos_pattern, name);
4940 store_free((void *)re);
4942 originator_name = string_copy(name);
4945 /* A trusted caller has used -f but not -F */
4947 else originator_name = US"";
4950 /* Break the retry loop */
4955 if (++i > finduser_retries) break;
4959 /* If we cannot get a user login, log the incident and give up, unless the
4960 configuration specifies something to use. When running in the test harness,
4961 any setting of unknown_login overrides the actual name. */
4963 if (!originator_login || f.running_in_test_harness)
4967 originator_login = expand_string(unknown_login);
4968 if (!originator_name && unknown_username)
4969 originator_name = expand_string(unknown_username);
4970 if (!originator_name) originator_name = US"";
4972 if (!originator_login)
4973 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4977 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4980 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
4982 /* If a message is created by this call of Exim, the uid/gid of its originator
4983 are those of the caller. These values are overridden if an existing message is
4984 read in from the spool. */
4986 originator_uid = real_uid;
4987 originator_gid = real_gid;
4989 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4990 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4992 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4993 returns. We leave this till here so that the originator_ fields are available
4994 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4997 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5001 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5002 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5003 "mua_wrapper is set");
5006 # ifndef DISABLE_TLS
5007 /* This also checks that the library linkage is working and we can call
5008 routines in it, so call even if tls_require_ciphers is unset */
5010 # ifdef MEASURE_TIMING
5011 struct timeval t0, diff;
5012 (void)gettimeofday(&t0, NULL);
5014 if (!tls_dropprivs_validate_require_cipher(FALSE))
5016 # ifdef MEASURE_TIMING
5017 report_time_since(&t0, US"validate_ciphers (delta)");
5025 /* If the sender ident has not been set (by a trusted caller) set it to
5026 the caller. This will get overwritten below for an inetd call. If a trusted
5027 caller has set it empty, unset it. */
5029 if (!sender_ident) sender_ident = originator_login;
5030 else if (!*sender_ident) sender_ident = NULL;
5032 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5033 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5034 originator_* variables set. */
5036 if (test_rewrite_arg >= 0)
5038 f.really_exim = FALSE;
5039 if (test_rewrite_arg >= argc)
5041 printf("-brw needs an address argument\n");
5042 exim_exit(EXIT_FAILURE);
5044 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5045 exim_exit(EXIT_SUCCESS);
5048 /* A locally-supplied message is considered to be coming from a local user
5049 unless a trusted caller supplies a sender address with -f, or is passing in the
5050 message via SMTP (inetd invocation or otherwise). */
5052 if ( !sender_address && !smtp_input
5053 || !f.trusted_caller && filter_test == FTEST_NONE)
5055 f.sender_local = TRUE;
5057 /* A trusted caller can supply authenticated_sender and authenticated_id
5058 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5059 defaults except when host checking. */
5061 if (!authenticated_sender && !host_checking)
5062 authenticated_sender = string_sprintf("%s@%s", originator_login,
5063 qualify_domain_sender);
5064 if (!authenticated_id && !host_checking)
5065 authenticated_id = originator_login;
5068 /* Trusted callers are always permitted to specify the sender address.
5069 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5070 is specified is the empty address. However, if a trusted caller does not
5071 specify a sender address for SMTP input, we leave sender_address unset. This
5072 causes the MAIL commands to be honoured. */
5074 if ( !smtp_input && !sender_address
5075 || !receive_check_set_sender(sender_address))
5077 /* Either the caller is not permitted to set a general sender, or this is
5078 non-SMTP input and the trusted caller has not set a sender. If there is no
5079 sender, or if a sender other than <> is set, override with the originator's
5080 login (which will get qualified below), except when checking things. */
5082 if ( !sender_address /* No sender_address set */
5084 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5085 !checking)) /* Not running tests, including filter tests */
5087 sender_address = originator_login;
5088 f.sender_address_forced = FALSE;
5089 sender_address_domain = 0;
5093 /* Remember whether an untrusted caller set the sender address */
5095 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5097 /* Ensure that the sender address is fully qualified unless it is the empty
5098 address, which indicates an error message, or doesn't exist (root caller, smtp
5099 interface, no -f argument). */
5101 if (sender_address && *sender_address && sender_address_domain == 0)
5102 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5103 qualify_domain_sender);
5105 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5107 /* Handle a request to verify a list of addresses, or test them for delivery.
5108 This must follow the setting of the sender address, since routers can be
5109 predicated upon the sender. If no arguments are given, read addresses from
5110 stdin. Set debug_level to at least D_v to get full output for address testing.
5113 if (verify_address_mode || f.address_test_mode)
5116 int flags = vopt_qualify;
5118 if (verify_address_mode)
5120 if (!verify_as_sender) flags |= vopt_is_recipient;
5121 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5126 flags |= vopt_is_recipient;
5127 debug_selector |= D_v;
5128 debug_file = stderr;
5129 debug_fd = fileno(debug_file);
5130 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5133 if (recipients_arg < argc)
5134 while (recipients_arg < argc)
5136 /* Supplied addresses are tainted since they come from a user */
5137 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5140 BOOL finished = FALSE;
5141 uschar *ss = parse_find_address_end(s, FALSE);
5142 if (*ss == ',') *ss = 0; else finished = TRUE;
5143 test_address(s, flags, &exit_value);
5146 while (*++s == ',' || isspace(*s)) ;
5152 uschar * s = get_stdinput(NULL, NULL);
5154 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5158 exim_exit(exit_value);
5161 /* Handle expansion checking. Either expand items on the command line, or read
5162 from stdin if there aren't any. If -Mset was specified, load the message so
5163 that its variables can be used, but restrict this facility to admin users.
5164 Otherwise, if -bem was used, read a message from stdin. */
5168 dns_init(FALSE, FALSE, FALSE);
5169 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5173 exim_fail("exim: permission denied\n");
5174 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5175 /* Checking the length of the ID is sufficient to validate it.
5176 Get an untainted version so file opens can be done. */
5177 message_id = string_copy_taint(message_id, FALSE);
5179 spoolname = string_sprintf("%s-H", message_id);
5180 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5181 printf ("Failed to load message datafile %s\n", message_id);
5182 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5183 printf ("Failed to load message %s\n", message_id);
5186 /* Read a test message from a file. We fudge it up to be on stdin, saving
5187 stdin itself for later reading of expansion strings. */
5189 else if (expansion_test_message)
5191 int save_stdin = dup(0);
5192 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5194 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5197 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5198 message_ended = END_NOTENDED;
5199 read_message_body(receive_msg(extract_recipients));
5200 message_linecount += body_linecount;
5201 (void)dup2(save_stdin, 0);
5202 (void)close(save_stdin);
5203 clearerr(stdin); /* Required by Darwin */
5206 /* Only admin users may see config-file macros this way */
5208 if (!f.admin_user) macros_user = macros = mlast = NULL;
5210 /* Allow $recipients for this testing */
5212 f.enable_dollar_recipients = TRUE;
5214 /* Expand command line items */
5216 if (recipients_arg < argc)
5217 while (recipients_arg < argc)
5218 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5224 char *(*fn_readline)(const char *) = NULL;
5225 void (*fn_addhist)(const char *) = NULL;
5229 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5232 while (s = get_stdinput(fn_readline, fn_addhist))
5233 expansion_test_line(s);
5236 if (dlhandle) dlclose(dlhandle);
5240 /* The data file will be open after -Mset */
5242 if (deliver_datafile >= 0)
5244 (void)close(deliver_datafile);
5245 deliver_datafile = -1;
5248 exim_exit(EXIT_SUCCESS);
5252 /* The active host name is normally the primary host name, but it can be varied
5253 for hosts that want to play several parts at once. We need to ensure that it is
5254 set for host checking, and for receiving messages. */
5256 smtp_active_hostname = primary_hostname;
5257 if (raw_active_hostname != NULL)
5259 uschar *nah = expand_string(raw_active_hostname);
5262 if (!f.expand_string_forcedfail)
5263 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5264 "(smtp_active_hostname): %s", raw_active_hostname,
5265 expand_string_message);
5267 else if (nah[0] != 0) smtp_active_hostname = nah;
5270 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5271 given IP address so that the blocking and relay configuration can be tested.
5272 Unless a sender_ident was set by -oMt, we discard it (the default is the
5273 caller's login name). An RFC 1413 call is made only if we are running in the
5274 test harness and an incoming interface and both ports are specified, because
5275 there is no TCP/IP call to find the ident for. */
5282 if (!sender_ident_set)
5284 sender_ident = NULL;
5285 if (f.running_in_test_harness && sender_host_port
5286 && interface_address && interface_port)
5287 verify_get_ident(1223); /* note hardwired port number */
5290 /* In case the given address is a non-canonical IPv6 address, canonicalize
5291 it. The code works for both IPv4 and IPv6, as it happens. */
5293 size = host_aton(sender_host_address, x);
5294 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5295 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5297 /* Now set up for testing */
5299 host_build_sender_fullhost();
5303 f.sender_local = FALSE;
5304 f.sender_host_notsocket = TRUE;
5305 debug_file = stderr;
5306 debug_fd = fileno(debug_file);
5307 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5308 "**** but without any ident (RFC 1413) callback.\n"
5309 "**** This is not for real!\n\n",
5310 sender_host_address);
5312 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5313 if (verify_check_host(&hosts_connection_nolog) == OK)
5314 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5315 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5317 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5318 because a log line has already been written for all its failure exists
5319 (usually "connection refused: <reason>") and writing another one is
5320 unnecessary clutter. */
5322 if (smtp_start_session())
5325 for (; (reset_point = store_mark()); store_reset(reset_point))
5327 if (smtp_setup_msg() <= 0) break;
5328 if (!receive_msg(FALSE)) break;
5330 return_path = sender_address = NULL;
5331 dnslist_domain = dnslist_matched = NULL;
5332 #ifndef DISABLE_DKIM
5333 dkim_cur_signer = NULL;
5336 deliver_localpart_orig = NULL;
5337 deliver_domain_orig = NULL;
5338 callout_address = sending_ip_address = NULL;
5339 deliver_localpart_data = deliver_domain_data =
5340 recipient_data = sender_data = NULL;
5341 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5345 exim_exit(EXIT_SUCCESS);
5349 /* Arrange for message reception if recipients or SMTP were specified;
5350 otherwise complain unless a version print (-bV) happened or this is a filter
5351 verification test or info dump.
5352 In the former case, show the configuration file name. */
5354 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5356 if (version_printed)
5358 if (Ustrchr(config_main_filelist, ':'))
5359 printf("Configuration file search path is %s\n", config_main_filelist);
5360 printf("Configuration file is %s\n", config_main_filename);
5361 return EXIT_SUCCESS;
5364 if (info_flag != CMDINFO_NONE)
5366 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5367 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5370 if (filter_test == FTEST_NONE)
5371 exim_usage(called_as);
5375 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5376 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5377 that we are not called from inetd, because that is rejected above. The
5378 following configuration settings are forced here:
5380 (1) Synchronous delivery (-odi)
5381 (2) Errors to stderr (-oep == -oeq)
5382 (3) No parallel remote delivery
5383 (4) Unprivileged delivery
5385 We don't force overall queueing options because there are several of them;
5386 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5387 to override any SMTP queueing. */
5391 f.synchronous_delivery = TRUE;
5392 arg_error_handling = ERRORS_STDERR;
5393 remote_max_parallel = 1;
5394 deliver_drop_privilege = TRUE;
5395 f.queue_smtp = FALSE;
5396 queue_smtp_domains = NULL;
5398 message_utf8_downconvert = -1; /* convert-if-needed */
5403 /* Prepare to accept one or more new messages on the standard input. When a
5404 message has been read, its id is returned in message_id[]. If doing immediate
5405 delivery, we fork a delivery process for each received message, except for the
5406 last one, where we can save a process switch.
5408 It is only in non-smtp mode that error_handling is allowed to be changed from
5409 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5410 sendmail error modes other than -oem ever actually used? Later: yes.) */
5412 if (!smtp_input) error_handling = arg_error_handling;
5414 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5415 logging being sent down the socket and make an identd call to get the
5418 else if (f.is_inetd)
5420 (void)fclose(stderr);
5421 exim_nullstd(); /* Re-open to /dev/null */
5422 verify_get_ident(IDENT_PORT);
5423 host_build_sender_fullhost();
5424 set_process_info("handling incoming connection from %s via inetd",
5428 /* If the sender host address has been set, build sender_fullhost if it hasn't
5429 already been done (which it will have been for inetd). This caters for the
5430 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5431 so that the test for IP options is skipped for -bs input. */
5433 if (sender_host_address && !sender_fullhost)
5435 host_build_sender_fullhost();
5436 set_process_info("handling incoming connection from %s via -oMa",
5438 f.sender_host_notsocket = TRUE;
5441 /* Otherwise, set the sender host as unknown except for inetd calls. This
5442 prevents host checking in the case of -bs not from inetd and also for -bS. */
5444 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5446 /* If stdout does not exist, then dup stdin to stdout. This can happen
5447 if exim is started from inetd. In this case fd 0 will be set to the socket,
5448 but fd 1 will not be set. This also happens for passed SMTP channels. */
5450 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5452 /* Set up the incoming protocol name and the state of the program. Root is
5453 allowed to force received protocol via the -oMr option above. If we have come
5454 via inetd, the process info has already been set up. We don't set
5455 received_protocol here for smtp input, as it varies according to
5456 batch/HELO/EHLO/AUTH/TLS. */
5460 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5461 smtp_batched_input? "batched " : "",
5462 sender_address ? sender_address : originator_login);
5466 int old_pool = store_pool;
5467 store_pool = POOL_PERM;
5468 if (!received_protocol)
5469 received_protocol = string_sprintf("local%s", called_as);
5470 store_pool = old_pool;
5471 set_process_info("accepting a local non-SMTP message from <%s>",
5475 /* Initialize the session_local_queue-only flag (this will be ignored if
5476 mua_wrapper is set) */
5479 session_local_queue_only = queue_only;
5481 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5482 the spool if so configured. On failure, we must not attempt to send an error
5483 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5484 error code is given.) */
5486 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5487 exim_fail("exim: insufficient disk space\n");
5489 /* If this is smtp input of any kind, real or batched, handle the start of the
5492 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5493 because a log line has already been written for all its failure exists
5494 (usually "connection refused: <reason>") and writing another one is
5495 unnecessary clutter. */
5501 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5502 if (verify_check_host(&hosts_connection_nolog) == OK)
5503 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5504 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5505 if (!smtp_start_session())
5508 exim_exit(EXIT_SUCCESS);
5512 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5513 (we handle buferring so as to have visibility of fill level). */
5517 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5518 if (expand_string_message)
5519 if (thismessage_size_limit == -1)
5520 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5521 "message_size_limit: %s", expand_string_message);
5523 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5524 "message_size_limit: %s", expand_string_message);
5526 setvbuf(stdin, NULL, _IONBF, 0);
5529 /* Loop for several messages when reading SMTP input. If we fork any child
5530 processes, we don't want to wait for them unless synchronous delivery is
5531 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5532 same as SIG_DFL, despite the fact that documentation often lists the default as
5533 "ignore". This is a confusing area. This is what I know:
5535 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5536 processes that complete simply to go away without ever becoming defunct. You
5537 can't then wait for them - but we don't want to wait for them in the
5538 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5539 happen for all OS (e.g. *BSD is different).
5541 But that's not the end of the story. Some (many? all?) systems have the
5542 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5543 has by default, so it seems that the difference is merely one of default
5544 (compare restarting vs non-restarting signals).
5546 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5547 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5548 of the loop below. Paranoia rules.
5550 February 2003: That's *still* not the end of the story. There are now versions
5551 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5552 process then calls waitpid(), a grumble is written to the system log, because
5553 this is logically inconsistent. In other words, it doesn't like the paranoia.
5554 As a consequence of this, the waitpid() below is now excluded if we are sure
5555 that SIG_IGN works. */
5557 if (!f.synchronous_delivery)
5560 struct sigaction act;
5561 act.sa_handler = SIG_IGN;
5562 sigemptyset(&(act.sa_mask));
5563 act.sa_flags = SA_NOCLDWAIT;
5564 sigaction(SIGCHLD, &act, NULL);
5566 signal(SIGCHLD, SIG_IGN);
5570 /* Save the current store pool point, for resetting at the start of
5571 each message, and save the real sender address, if any. */
5573 real_sender_address = sender_address;
5575 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5576 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5579 for (BOOL more = TRUE; more; )
5581 rmark reset_point = store_mark();
5584 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5585 input and build the recipients list, before calling receive_msg() to read the
5586 message proper. Whatever sender address is given in the SMTP transaction is
5587 often ignored for local senders - we use the actual sender, which is normally
5588 either the underlying user running this process or a -f argument provided by
5589 a trusted caller. It is saved in real_sender_address. The test for whether to
5590 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5595 if ((rc = smtp_setup_msg()) > 0)
5597 if (real_sender_address != NULL &&
5598 !receive_check_set_sender(sender_address))
5600 sender_address = raw_sender = real_sender_address;
5601 sender_address_unrewritten = NULL;
5604 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5605 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5606 the very end. The result of the ACL is ignored (as for other non-SMTP
5607 messages). It is run for its potential side effects. */
5609 if (smtp_batched_input && acl_not_smtp_start != NULL)
5611 uschar *user_msg, *log_msg;
5612 f.enable_dollar_recipients = TRUE;
5613 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5614 &user_msg, &log_msg);
5615 f.enable_dollar_recipients = FALSE;
5618 /* Now get the data for the message */
5620 more = receive_msg(extract_recipients);
5623 cancel_cutthrough_connection(TRUE, US"receive dropped");
5624 if (more) goto MORELOOP;
5625 smtp_log_no_mail(); /* Log no mail if configured */
5626 exim_exit(EXIT_FAILURE);
5631 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5632 smtp_log_no_mail(); /* Log no mail if configured */
5633 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5637 /* In the non-SMTP case, we have all the information from the command
5638 line, but must process it in case it is in the more general RFC822
5639 format, and in any case, to detect syntax errors. Also, it appears that
5640 the use of comma-separated lists as single arguments is common, so we
5641 had better support them. */
5646 int count = argc - recipients_arg;
5647 uschar **list = argv + recipients_arg;
5649 /* These options cannot be changed dynamically for non-SMTP messages */
5651 f.active_local_sender_retain = local_sender_retain;
5652 f.active_local_from_check = local_from_check;
5654 /* Save before any rewriting */
5656 raw_sender = string_copy(sender_address);
5658 /* Loop for each argument (supplied by user hence tainted) */
5660 for (int i = 0; i < count; i++)
5662 int start, end, domain;
5664 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5665 * We'll still want to cap it to something, just in case. */
5666 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5668 /* Loop for each comma-separated address */
5672 BOOL finished = FALSE;
5674 uschar *ss = parse_find_address_end(s, FALSE);
5676 if (*ss == ',') *ss = 0; else finished = TRUE;
5678 /* Check max recipients - if -t was used, these aren't recipients */
5680 if (recipients_max > 0 && ++rcount > recipients_max &&
5681 !extract_recipients)
5682 if (error_handling == ERRORS_STDERR)
5684 fprintf(stderr, "exim: too many recipients\n");
5685 exim_exit(EXIT_FAILURE);
5689 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5690 errors_sender_rc : EXIT_FAILURE;
5694 BOOL b = allow_utf8_domains;
5695 allow_utf8_domains = TRUE;
5698 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5702 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5703 else allow_utf8_domains = b;
5708 if (domain == 0 && !f.allow_unqualified_recipient)
5711 errmess = US"unqualified recipient address not allowed";
5715 if (error_handling == ERRORS_STDERR)
5717 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5718 string_printing(list[i]), errmess);
5719 exim_exit(EXIT_FAILURE);
5725 eblock.text1 = string_printing(list[i]);
5726 eblock.text2 = errmess;
5728 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5729 errors_sender_rc : EXIT_FAILURE;
5732 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5735 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5739 /* Show the recipients when debugging */
5743 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5744 if (recipients_list)
5746 debug_printf("Recipients:\n");
5747 for (int i = 0; i < recipients_count; i++)
5748 debug_printf(" %s\n", recipients_list[i].address);
5752 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5753 ignored; rejecting here would just add complication, and it can just as
5754 well be done later. Allow $recipients to be visible in the ACL. */
5756 if (acl_not_smtp_start)
5758 uschar *user_msg, *log_msg;
5759 f.enable_dollar_recipients = TRUE;
5760 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5761 &user_msg, &log_msg);
5762 f.enable_dollar_recipients = FALSE;
5765 /* Pause for a while waiting for input. If none received in that time,
5766 close the logfile, if we had one open; then if we wait for a long-running
5767 datasource (months, in one use-case) log rotation will not leave us holding
5770 if (!receive_timeout)
5771 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5774 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5775 will just read the headers for the message, and not write anything onto the
5778 message_ended = END_NOTENDED;
5779 more = receive_msg(extract_recipients);
5781 /* more is always FALSE here (not SMTP message) when reading a message
5782 for real; when reading the headers of a message for filter testing,
5783 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5785 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5786 } /* Non-SMTP message reception */
5788 /* If this is a filter testing run, there are headers in store, but
5789 no message on the spool. Run the filtering code in testing mode, setting
5790 the domain to the qualify domain and the local part to the current user,
5791 unless they have been set by options. The prefix and suffix are left unset
5792 unless specified. The the return path is set to to the sender unless it has
5793 already been set from a return-path header in the message. */
5795 if (filter_test != FTEST_NONE)
5797 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5798 deliver_domain_orig = deliver_domain;
5799 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5800 deliver_localpart_orig = deliver_localpart;
5801 deliver_localpart_prefix = US ftest_prefix;
5802 deliver_localpart_suffix = US ftest_suffix;
5803 deliver_home = originator_home;
5807 printf("Return-path copied from sender\n");
5808 return_path = string_copy(sender_address);
5811 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5812 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5814 receive_add_recipient(
5815 string_sprintf("%s%s%s@%s",
5816 ftest_prefix ? ftest_prefix : US"",
5818 ftest_suffix ? ftest_suffix : US"",
5819 deliver_domain), -1);
5821 printf("Recipient = %s\n", recipients_list[0].address);
5822 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5823 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5825 if (chdir("/")) /* Get away from wherever the user is running this from */
5827 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5828 exim_exit(EXIT_FAILURE);
5831 /* Now we run either a system filter test, or a user filter test, or both.
5832 In the latter case, headers added by the system filter will persist and be
5833 available to the user filter. We need to copy the filter variables
5836 if (filter_test & FTEST_SYSTEM)
5837 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5838 exim_exit(EXIT_FAILURE);
5840 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5842 if (filter_test & FTEST_USER)
5843 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5844 exim_exit(EXIT_FAILURE);
5846 exim_exit(EXIT_SUCCESS);
5849 /* Else act on the result of message reception. We should not get here unless
5850 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5851 will be TRUE. If it is not, check on the number of messages received in this
5854 if ( !session_local_queue_only
5855 && smtp_accept_queue_per_connection > 0
5856 && receive_messagecount > smtp_accept_queue_per_connection)
5858 session_local_queue_only = TRUE;
5859 queue_only_reason = 2;
5862 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5863 and queue_only_load is set, check that the load average is below it. If it is
5864 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5865 default), we put the whole session into queue_only mode. It then remains this
5866 way for any subsequent messages on the same SMTP connection. This is a
5867 deliberate choice; even though the load average may fall, it doesn't seem
5868 right to deliver later messages on the same call when not delivering earlier
5869 ones. However, there are odd cases where this is not wanted, so this can be
5870 changed by setting queue_only_load_latch false. */
5872 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5873 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5875 queue_only_reason = 3;
5876 if (queue_only_load_latch) session_local_queue_only = TRUE;
5879 /* If running as an MUA wrapper, all queueing options and freezing options
5883 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5885 /* Log the queueing here, when it will get a message id attached, but
5886 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5889 if (local_queue_only)
5891 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5892 switch(queue_only_reason)
5895 log_write(L_delay_delivery,
5896 LOG_MAIN, "no immediate delivery: more than %d messages "
5897 "received in one connection", smtp_accept_queue_per_connection);
5901 log_write(L_delay_delivery,
5902 LOG_MAIN, "no immediate delivery: load average %.2f",
5903 (double)load_average/1000.0);
5908 else if (f.queue_only_policy || f.deliver_freeze)
5909 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5911 /* Else do the delivery unless the ACL or local_scan() called for queue only
5912 or froze the message. Always deliver in a separate process. A fork failure is
5913 not a disaster, as the delivery will eventually happen on a subsequent queue
5914 run. The search cache must be tidied before the fork, as the parent will
5915 do it before exiting. The child will trigger a lookup failure and
5916 thereby defer the delivery if it tries to use (for example) a cached ldap
5917 connection that the parent has called unbind on. */
5924 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5927 close_unwanted(); /* Close unwanted file descriptors and TLS */
5928 exim_nullstd(); /* Ensure std{in,out,err} exist */
5930 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5931 mode, deliver_drop_privilege is forced TRUE). */
5933 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5935 delivery_re_exec(CEE_EXEC_EXIT);
5936 /* Control does not return here. */
5939 /* No need to re-exec */
5941 rc = deliver_message(message_id, FALSE, FALSE);
5943 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5944 ? EXIT_SUCCESS : EXIT_FAILURE);
5949 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5950 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5951 "process: %s", strerror(errno));
5955 release_cutthrough_connection(US"msg passed for delivery");
5957 /* In the parent, wait if synchronous delivery is required. This will
5958 always be the case in MUA wrapper mode. */
5960 if (f.synchronous_delivery)
5963 while (wait(&status) != pid);
5964 if ((status & 0x00ff) != 0)
5965 log_write(0, LOG_MAIN|LOG_PANIC,
5966 "process %d crashed with signal %d while delivering %s",
5967 (int)pid, status & 0x00ff, message_id);
5968 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5973 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5974 automatically reaps children (see comments above the loop), clear away any
5975 finished subprocesses here, in case there are lots of messages coming in
5976 from the same source. */
5978 #ifndef SIG_IGN_WORKS
5979 while (waitpid(-1, NULL, WNOHANG) > 0);
5983 return_path = sender_address = NULL;
5984 authenticated_sender = NULL;
5985 deliver_localpart_orig = NULL;
5986 deliver_domain_orig = NULL;
5987 deliver_host = deliver_host_address = NULL;
5988 dnslist_domain = dnslist_matched = NULL;
5989 #ifdef WITH_CONTENT_SCAN
5990 malware_name = NULL;
5992 callout_address = NULL;
5993 sending_ip_address = NULL;
5994 deliver_localpart_data = deliver_domain_data =
5995 recipient_data = sender_data = NULL;
5997 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
5999 store_reset(reset_point);
6002 exim_exit(EXIT_SUCCESS); /* Never returns */
6003 return 0; /* To stop compiler warning */