1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2022 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
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>
24 # include <execinfo.h>
28 # include <gnutls/gnutls.h>
29 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
34 extern void init_lookup_list(void);
38 /*************************************************
39 * Function interface to store functions *
40 *************************************************/
42 /* We need some real functions to pass to the PCRE regular expression library
43 for store allocation via Exim's store manager. The normal calls are actually
44 macros that pass over location information to make tracing easier. These
45 functions just interface to the standard macro calls. A good compiler will
46 optimize out the tail recursion and so not make them too expensive. */
49 function_store_malloc(PCRE2_SIZE size, void * tag)
51 return store_malloc((int)size);
55 function_store_free(void * block, void * tag)
57 /* At least some version of pcre2 pass a null pointer */
58 if (block) store_free(block);
63 function_store_get(PCRE2_SIZE size, void * tag)
65 return store_get((int)size, GET_UNTAINTED); /* loses track of taint */
69 function_store_nullfree(void * block, void * tag)
76 /*************************************************
77 * Enums for cmdline interface *
78 *************************************************/
80 enum commandline_info { CMDINFO_NONE=0,
81 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
89 pcre_mlc_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
90 pcre_gen_ctx = pcre2_general_context_create(function_store_get, function_store_nullfree, NULL);
92 pcre_mlc_cmp_ctx = pcre2_compile_context_create(pcre_mlc_ctx);
93 pcre_gen_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
95 pcre_gen_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
101 /*************************************************
102 * Execute regular expression and set strings *
103 *************************************************/
105 /* This function runs a regular expression match, and sets up the pointers to
106 the matched substrings. The matched strings are copied so the lifetime of
107 the subject is not a problem.
110 re the compiled expression
111 subject the subject string
112 options additional PCRE options
113 setup if < 0 do full setup
114 if >= 0 setup from setup+1 onwards,
115 excluding the full matched string
117 Returns: TRUE if matched, or FALSE
121 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
123 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
124 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
125 PCRE_EOPT | options, md, pcre_gen_mtc_ctx);
128 if ((yield = (res >= 0)))
130 res = pcre2_get_ovector_count(md);
131 expand_nmax = setup < 0 ? 0 : setup + 1;
132 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
135 pcre2_substring_get_bynumber(md, matchnum,
136 (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
137 expand_nlength[expand_nmax++] = (int)len;
141 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
144 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
145 debug_printf_indent("pcre2: %s\n", errbuf);
147 /* pcre2_match_data_free(md); gen ctx needs no free */
152 /* Check just for match with regex. Uses the common memory-handling.
156 subject string to be checked
157 slen length of subject; -1 for nul-terminated
158 rptr pointer for matched string, copied, or NULL
160 Return: TRUE for a match.
164 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
166 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
167 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
168 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
169 0, PCRE_EOPT, md, pcre_gen_mtc_ctx);
170 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
176 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
179 /* pcre2_match_data_free(md); gen ctx needs no free */
185 /*************************************************
186 * Set up processing details *
187 *************************************************/
189 /* Save a text string for dumping when SIGUSR1 is received.
190 Do checks for overruns.
192 Arguments: format and arguments, as for printf()
197 set_process_info(const char *format, ...)
199 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
204 g = string_fmt_append(&gs, "%5d ", (int)getpid());
206 va_start(ap, format);
207 if (!string_vformat(g, 0, format, ap))
210 g = string_cat(&gs, US"**** string overflowed buffer ****");
212 g = string_catn(g, US"\n", 1);
213 string_from_gstring(g);
214 process_info_len = g->ptr;
215 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
219 /***********************************************
220 * Handler for SIGTERM *
221 ***********************************************/
224 term_handler(int sig)
230 /***********************************************
231 * Handler for SIGSEGV *
232 ***********************************************/
234 #define STACKDUMP_MAX 24
239 void * buf[STACKDUMP_MAX];
241 int nptrs = backtrace(buf, STACKDUMP_MAX);
243 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace\n");
244 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
245 if ((ss = backtrace_symbols(buf, nptrs)))
247 for (int i = 0; i < nptrs; i++)
248 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s\n", ss[i]);
252 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s\n", strerror(errno));
253 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
261 segv_handler(int sig, siginfo_t * info, void * uctx)
263 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
264 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
265 switch (info->si_code)
267 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
268 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
269 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
270 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
273 if (US info->si_addr < US 4096)
274 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
276 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
277 if (process_info_len > 0)
278 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
280 signal(SIGSEGV, SIG_DFL);
285 segv_handler(int sig)
287 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
288 if (process_info_len > 0)
289 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
291 signal(SIGSEGV, SIG_DFL);
297 /*************************************************
298 * Handler for SIGUSR1 *
299 *************************************************/
301 /* SIGUSR1 causes any exim process to write to the process log details of
302 what it is currently doing. It will only be used if the OS is capable of
303 setting up a handler that causes automatic restarting of any system call
304 that is in progress at the time.
306 This function takes care to be signal-safe.
308 Argument: the signal number (SIGUSR1)
313 usr1_handler(int sig)
317 os_restarting_signal(sig, usr1_handler);
319 if (!process_log_path) return;
320 fd = log_open_as_exim(process_log_path);
322 /* If we are neither exim nor root, or if we failed to create the log file,
323 give up. There is not much useful we can do with errors, since we don't want
324 to disrupt whatever is going on outside the signal handler. */
328 (void)write(fd, process_info, process_info_len);
334 /*************************************************
336 *************************************************/
338 /* This handler is enabled most of the time that Exim is running. The handler
339 doesn't actually get used unless alarm() has been called to set a timer, to
340 place a time limit on a system call of some kind. When the handler is run, it
343 There are some other SIGALRM handlers that are used in special cases when more
344 than just a flag setting is required; for example, when reading a message's
345 input. These are normally set up in the code module that uses them, and the
346 SIGALRM handler is reset to this one afterwards.
348 Argument: the signal value (SIGALRM)
353 sigalrm_handler(int sig)
356 os_non_restarting_signal(SIGALRM, sigalrm_handler);
361 /*************************************************
362 * Sleep for a fractional time interval *
363 *************************************************/
365 /* This function is called by millisleep() and exim_wait_tick() to wait for a
366 period of time that may include a fraction of a second. The coding is somewhat
367 tedious. We do not expect setitimer() ever to fail, but if it does, the process
368 will wait for ever, so we panic in this instance. (There was a case of this
369 when a bug in a function that calls milliwait() caused it to pass invalid data.
370 That's when I added the check. :-)
372 We assume it to be not worth sleeping for under 50us; this value will
373 require revisiting as hardware advances. This avoids the issue of
374 a zero-valued timer setting meaning "never fire".
376 Argument: an itimerval structure containing the interval
381 milliwait(struct itimerval *itval)
384 sigset_t old_sigmask;
385 int save_errno = errno;
387 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
389 (void)sigemptyset(&sigmask); /* Empty mask */
390 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
391 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
392 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
393 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
394 "setitimer() failed: %s", strerror(errno));
395 (void)sigfillset(&sigmask); /* All signals */
396 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
397 (void)sigsuspend(&sigmask); /* Until SIGALRM */
398 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
400 sigalrm_seen = FALSE;
406 /*************************************************
407 * Millisecond sleep function *
408 *************************************************/
410 /* The basic sleep() function has a granularity of 1 second, which is too rough
411 in some cases - for example, when using an increasing delay to slow down
414 Argument: number of millseconds
421 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
422 .it_value = {.tv_sec = msec/1000,
423 .tv_usec = (msec % 1000) * 1000}};
429 /*************************************************
430 * Compare microsecond times *
431 *************************************************/
438 Returns: -1, 0, or +1
442 exim_tvcmp(struct timeval *t1, struct timeval *t2)
444 if (t1->tv_sec > t2->tv_sec) return +1;
445 if (t1->tv_sec < t2->tv_sec) return -1;
446 if (t1->tv_usec > t2->tv_usec) return +1;
447 if (t1->tv_usec < t2->tv_usec) return -1;
454 /*************************************************
455 * Clock tick wait function *
456 *************************************************/
458 #ifdef _POSIX_MONOTONIC_CLOCK
459 # ifdef CLOCK_BOOTTIME
460 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
462 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
465 /* Amount EXIM_CLOCK is behind realtime, at startup. */
466 static struct timespec offset_ts;
469 exim_clock_init(void)
472 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
473 (void)gettimeofday(&tv, NULL);
474 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
475 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
476 if (offset_ts.tv_nsec >= 0) return;
478 offset_ts.tv_nsec += 1000*1000*1000;
484 exim_gettime(struct timeval * tv)
486 #ifdef _POSIX_MONOTONIC_CLOCK
487 struct timespec now_ts;
489 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
491 now_ts.tv_sec += offset_ts.tv_sec;
492 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
495 now_ts.tv_nsec -= 1000*1000*1000;
497 tv->tv_sec = now_ts.tv_sec;
498 tv->tv_usec = now_ts.tv_nsec / 1000;
502 (void)gettimeofday(tv, NULL);
506 /* Exim uses a time + a pid to generate a unique identifier in two places: its
507 message IDs, and in file names for maildir deliveries. Because some OS now
508 re-use pids within the same second, sub-second times are now being used.
509 However, for absolute certainty, we must ensure the clock has ticked before
510 allowing the relevant process to complete. At the time of implementation of
511 this code (February 2003), the speed of processors is such that the clock will
512 invariably have ticked already by the time a process has done its job. This
513 function prepares for the time when things are faster - and it also copes with
514 clocks that go backwards.
517 prev_tv A timeval which was used to create uniqueness; its usec field
518 has been rounded down to the value of the resolution.
519 We want to be sure the current time is greater than this.
520 On return, updated to current (rounded down).
521 resolution The resolution that was used to divide the microseconds
522 (1 for maildir, larger for message ids)
528 exim_wait_tick(struct timeval * prev_tv, int resolution)
530 struct timeval now_tv;
531 long int now_true_usec;
533 exim_gettime(&now_tv);
534 now_true_usec = now_tv.tv_usec;
535 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
537 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
539 struct itimerval itval;
540 itval.it_interval.tv_sec = 0;
541 itval.it_interval.tv_usec = 0;
542 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
543 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
545 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
546 negative value for the microseconds is possible only in the case when "now"
547 is more than a second less than "tgt". That means that itval.it_value.tv_sec
548 is greater than zero. The following correction is therefore safe. */
550 if (itval.it_value.tv_usec < 0)
552 itval.it_value.tv_usec += 1000000;
553 itval.it_value.tv_sec -= 1;
556 DEBUG(D_transport|D_receive)
558 if (!f.running_in_test_harness)
560 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
561 prev_tv->tv_sec, (long) prev_tv->tv_usec,
562 now_tv.tv_sec, (long) now_tv.tv_usec);
563 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
564 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
570 /* Be prapared to go around if the kernel does not implement subtick
571 granularity (GNU Hurd) */
573 exim_gettime(&now_tv);
574 now_true_usec = now_tv.tv_usec;
575 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
583 /*************************************************
584 * Call fopen() with umask 777 and adjust mode *
585 *************************************************/
587 /* Exim runs with umask(0) so that files created with open() have the mode that
588 is specified in the open() call. However, there are some files, typically in
589 the spool directory, that are created with fopen(). They end up world-writeable
590 if no precautions are taken. Although the spool directory is not accessible to
591 the world, this is an untidiness. So this is a wrapper function for fopen()
592 that sorts out the mode of the created file.
595 filename the file name
596 options the fopen() options
597 mode the required mode
599 Returns: the fopened FILE or NULL
603 modefopen(const uschar *filename, const char *options, mode_t mode)
605 mode_t saved_umask = umask(0777);
606 FILE *f = Ufopen(filename, options);
607 (void)umask(saved_umask);
608 if (f != NULL) (void)fchmod(fileno(f), mode);
613 /*************************************************
614 * Ensure stdin, stdout, and stderr exist *
615 *************************************************/
617 /* Some operating systems grumble if an exec() happens without a standard
618 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
619 file will be opened and will use these fd values, and then some other bit of
620 code will assume, for example, that it can write error messages to stderr.
621 This function ensures that fds 0, 1, and 2 are open if they do not already
622 exist, by connecting them to /dev/null.
624 This function is also used to ensure that std{in,out,err} exist at all times,
625 so that if any library that Exim calls tries to use them, it doesn't crash.
636 for (int i = 0; i <= 2; i++)
638 if (fstat(i, &statbuf) < 0 && errno == EBADF)
640 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
641 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
642 string_open_failed("/dev/null", NULL));
643 if (devnull != i) (void)dup2(devnull, i);
646 if (devnull > 2) (void)close(devnull);
652 /*************************************************
653 * Close unwanted file descriptors for delivery *
654 *************************************************/
656 /* This function is called from a new process that has been forked to deliver
657 an incoming message, either directly, or using exec.
659 We want any smtp input streams to be closed in this new process. However, it
660 has been observed that using fclose() here causes trouble. When reading in -bS
661 input, duplicate copies of messages have been seen. The files will be sharing a
662 file pointer with the parent process, and it seems that fclose() (at least on
663 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
664 least sometimes. Hence we go for closing the underlying file descriptors.
666 If TLS is active, we want to shut down the TLS library, but without molesting
667 the parent's SSL connection.
669 For delivery of a non-SMTP message, we want to close stdin and stdout (and
670 stderr unless debugging) because the calling process might have set them up as
671 pipes and be waiting for them to close before it waits for the submission
672 process to terminate. If they aren't closed, they hold up the calling process
673 until the initial delivery process finishes, which is not what we want.
675 Exception: We do want it for synchronous delivery!
677 And notwithstanding all the above, if D_resolver is set, implying resolver
678 debugging, leave stdout open, because that's where the resolver writes its
681 When we close stderr (which implies we've also closed stdout), we also get rid
682 of any controlling terminal.
694 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
696 (void)close(fileno(smtp_in));
697 (void)close(fileno(smtp_out));
702 (void)close(0); /* stdin */
703 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
704 if (debug_selector == 0) /* stderr */
706 if (!f.synchronous_delivery)
719 /*************************************************
721 *************************************************/
723 /* This function sets a new uid and gid permanently, optionally calling
724 initgroups() to set auxiliary groups. There are some special cases when running
725 Exim in unprivileged modes. In these situations the effective uid will not be
726 root; if we already have the right effective uid/gid, and don't need to
727 initialize any groups, leave things as they are.
732 igflag TRUE if initgroups() wanted
733 msg text to use in debugging output and failure log
735 Returns: nothing; bombs out on failure
739 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
741 uid_t euid = geteuid();
742 gid_t egid = getegid();
744 if (euid == root_uid || euid != uid || egid != gid || igflag)
746 /* At least one OS returns +1 for initgroups failure, so just check for
751 struct passwd *pw = getpwuid(uid);
753 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
754 "no passwd entry for uid=%ld", (long int)uid);
756 if (initgroups(pw->pw_name, gid) != 0)
757 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
758 (long int)uid, strerror(errno));
761 if (setgid(gid) < 0 || setuid(uid) < 0)
762 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
763 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
766 /* Debugging output included uid/gid and all groups */
770 int group_count, save_errno;
771 gid_t group_list[EXIM_GROUPLIST_SIZE];
772 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
773 (long int)geteuid(), (long int)getegid(), (long int)getpid());
774 group_count = getgroups(nelem(group_list), group_list);
776 debug_printf(" auxiliary group list:");
778 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
779 else if (group_count < 0)
780 debug_printf(" <error: %s>", strerror(save_errno));
781 else debug_printf(" <none>");
789 /*************************************************
791 *************************************************/
793 /* Exim exits via this function so that it always clears up any open
799 Returns: does not return
808 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
809 ">>>>>>>>>>>>>>>>\n",
810 (int)getpid(), process_purpose, rc);
816 exim_underbar_exit(int rc)
820 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
821 ">>>>>>>>>>>>>>>>\n",
822 (int)getpid(), process_purpose, rc);
828 /* Print error string, then die */
830 exim_fail(const char * fmt, ...)
834 vfprintf(stderr, fmt, ap);
838 /* fail if a length is too long */
840 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
842 if (itemlen <= maxlen)
844 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
845 itemlen, maxlen, description);
849 /* only pass through the string item back to the caller if it's short enough */
850 static inline const uschar *
851 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
853 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
857 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
858 of chown()/fchown(). See src/functions.h for more explanation */
860 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
862 int saved_errno = errno; /* from the preceeding chown call */
864 log_write(0, LOG_MAIN|LOG_PANIC,
865 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
866 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
867 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
869 /* I leave this here, commented, in case the "bug"(?) comes up again.
870 It is not an Exim bug, but we can provide a workaround.
876 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
878 if (buf.st_uid == owner && buf.st_gid == group) return 0;
879 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
881 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
889 /*************************************************
890 * Extract port from host address *
891 *************************************************/
893 /* Called to extract the port from the values given to -oMa and -oMi.
894 It also checks the syntax of the address, and terminates it before the
895 port data when a port is extracted.
898 address the address, with possible port on the end
900 Returns: the port, or zero if there isn't one
901 bombs out on a syntax error
905 check_port(uschar *address)
907 int port = host_address_extract_port(address);
908 if (string_is_ip_address(address, NULL) == 0)
909 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
915 /*************************************************
916 * Test/verify an address *
917 *************************************************/
919 /* This function is called by the -bv and -bt code. It extracts a working
920 address from a full RFC 822 address. This isn't really necessary per se, but it
921 has the effect of collapsing source routes.
925 flags flag bits for verify_address()
926 exit_value to be set for failures
932 test_address(uschar *s, int flags, int *exit_value)
934 int start, end, domain;
935 uschar *parse_error = NULL;
936 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
940 fprintf(stdout, "syntax error: %s\n", parse_error);
945 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
946 -1, -1, NULL, NULL, NULL);
947 if (rc == FAIL) *exit_value = 2;
948 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
954 /*************************************************
955 * Show supported features *
956 *************************************************/
959 show_string(BOOL is_stdout, gstring * g)
961 const uschar * s = string_from_gstring(g);
963 if (is_stdout) fputs(CCS s, stdout);
964 else debug_printf("%s", s);
969 show_db_version(gstring * g)
971 #ifdef DB_VERSION_STRING
974 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
975 g = string_fmt_append(g, " Runtime: %s\n",
976 db_version(NULL, NULL, NULL));
979 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
981 #elif defined(BTREEVERSION) && defined(HASHVERSION)
983 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
985 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
988 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
989 g = string_cat(g, US"Probably ndbm\n");
990 #elif defined(USE_TDB)
991 g = string_cat(g, US"Using tdb\n");
994 g = string_cat(g, US"Probably GDBM (native mode)\n");
996 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1003 /* This function is called for -bV/--version and for -d to output the optional
1004 features of the current Exim binary.
1006 Arguments: BOOL, true for stdout else debug channel
1011 show_whats_supported(BOOL is_stdout)
1013 rmark reset_point = store_mark();
1016 DEBUG(D_any) {} else g = show_db_version(g);
1018 g = string_cat(g, US"Support for:");
1019 #ifdef SUPPORT_CRYPTEQ
1020 g = string_cat(g, US" crypteq");
1023 g = string_cat(g, US" iconv()");
1026 g = string_cat(g, US" IPv6");
1028 #ifdef HAVE_SETCLASSRESOURCES
1029 g = string_cat(g, US" use_setclassresources");
1032 g = string_cat(g, US" PAM");
1035 g = string_cat(g, US" Perl");
1037 #ifdef EXPAND_DLFUNC
1038 g = string_cat(g, US" Expand_dlfunc");
1040 #ifdef USE_TCP_WRAPPERS
1041 g = string_cat(g, US" TCPwrappers");
1044 g = string_cat(g, US" GnuTLS");
1047 g = string_cat(g, US" OpenSSL");
1049 #ifndef DISABLE_TLS_RESUME
1050 g = string_cat(g, US" TLS_resume");
1052 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1053 g = string_cat(g, US" translate_ip_address");
1055 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1056 g = string_cat(g, US" move_frozen_messages");
1058 #ifdef WITH_CONTENT_SCAN
1059 g = string_cat(g, US" Content_Scanning");
1062 g = string_cat(g, US" DANE");
1064 #ifndef DISABLE_DKIM
1065 g = string_cat(g, US" DKIM");
1067 #ifdef SUPPORT_DMARC
1068 g = string_cat(g, US" DMARC");
1070 #ifndef DISABLE_DNSSEC
1071 g = string_cat(g, US" DNSSEC");
1073 #ifndef DISABLE_EVENT
1074 g = string_cat(g, US" Event");
1077 g = string_cat(g, US" I18N");
1079 #ifndef DISABLE_OCSP
1080 g = string_cat(g, US" OCSP");
1082 #ifndef DISABLE_PIPE_CONNECT
1083 g = string_cat(g, US" PIPECONNECT");
1085 #ifndef DISABLE_PRDR
1086 g = string_cat(g, US" PRDR");
1088 #ifdef SUPPORT_PROXY
1089 g = string_cat(g, US" PROXY");
1091 #ifndef DISABLE_QUEUE_RAMP
1092 g = string_cat(g, US" Queue_Ramp");
1094 #ifdef SUPPORT_SOCKS
1095 g = string_cat(g, US" SOCKS");
1098 g = string_cat(g, US" SPF");
1100 #if defined(SUPPORT_SRS)
1101 g = string_cat(g, US" SRS");
1105 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1107 #ifdef EXPERIMENTAL_ARC
1108 g = string_cat(g, US" Experimental_ARC");
1110 #ifdef EXPERIMENTAL_BRIGHTMAIL
1111 g = string_cat(g, US" Experimental_Brightmail");
1113 #ifdef EXPERIMENTAL_DCC
1114 g = string_cat(g, US" Experimental_DCC");
1116 #ifdef EXPERIMENTAL_DSN_INFO
1117 g = string_cat(g, US" Experimental_DSN_info");
1119 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1120 g = string_cat(g, US" Experimental_ESMTP_Limits");
1122 #ifdef EXPERIMENTAL_QUEUEFILE
1123 g = string_cat(g, US" Experimental_QUEUEFILE");
1125 g = string_cat(g, US"\n");
1127 g = string_cat(g, US"Lookups (built-in):");
1128 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1129 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1131 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1132 g = string_cat(g, US" cdb");
1134 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1135 g = string_cat(g, US" dbm dbmjz dbmnz");
1137 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1138 g = string_cat(g, US" dnsdb");
1140 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1141 g = string_cat(g, US" dsearch");
1143 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1144 g = string_cat(g, US" ibase");
1146 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1147 g = string_cat(g, US" json");
1149 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1150 g = string_cat(g, US" ldap ldapdn ldapm");
1153 g = string_cat(g, US" lmdb");
1155 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1156 g = string_cat(g, US" mysql");
1158 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1159 g = string_cat(g, US" nis nis0");
1161 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1162 g = string_cat(g, US" nisplus");
1164 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1165 g = string_cat(g, US" oracle");
1167 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1168 g = string_cat(g, US" passwd");
1170 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1171 g = string_cat(g, US" pgsql");
1173 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1174 g = string_cat(g, US" redis");
1176 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1177 g = string_cat(g, US" sqlite");
1179 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1180 g = string_cat(g, US" testdb");
1182 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1183 g = string_cat(g, US" whoson");
1185 g = string_cat(g, US"\n");
1187 g = auth_show_supported(g);
1188 g = route_show_supported(g);
1189 g = transport_show_supported(g);
1191 #ifdef WITH_CONTENT_SCAN
1192 g = malware_show_supported(g);
1194 show_string(is_stdout, g); g = NULL;
1196 if (fixed_never_users[0] > 0)
1199 g = string_cat(g, US"Fixed never_users: ");
1200 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1201 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1202 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1205 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1207 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1209 /* Everything else is details which are only worth reporting when debugging.
1210 Perhaps the tls_version_report should move into this too. */
1214 /* clang defines __GNUC__ (at least, for me) so test for it first */
1215 #if defined(__clang__)
1216 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1217 #elif defined(__GNUC__)
1218 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1222 "? unknown version ?"
1226 g = string_cat(g, US"Compiler: <unknown>\n");
1229 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1230 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1231 __GLIBC__, __GLIBC_MINOR__);
1232 if (__GLIBC_PREREQ(2, 1))
1233 g = string_fmt_append(g, " Runtime: %s\n",
1234 gnu_get_libc_version());
1237 g = show_db_version(g);
1240 g = tls_version_report(g);
1243 g = utf8_version_report(g);
1245 #ifdef SUPPORT_DMARC
1246 g = dmarc_version_report(g);
1249 g = spf_lib_version_report(g);
1252 show_string(is_stdout, g);
1255 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1256 if (authi->version_report)
1257 g = (*authi->version_report)(g);
1259 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1260 characters; unless it's an ancient version of PCRE in which case it
1262 #ifndef PCRE_PRERELEASE
1263 # define PCRE_PRERELEASE
1266 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1269 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1270 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1272 PCRE2_MAJOR, PCRE2_MINOR,
1273 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1277 #undef EXPAND_AND_QUOTE
1279 show_string(is_stdout, g);
1283 for (int i = 0; i < lookup_list_count; i++)
1284 if (lookup_list[i]->version_report)
1285 g = lookup_list[i]->version_report(g);
1286 show_string(is_stdout, g);
1289 #ifdef WHITELIST_D_MACROS
1290 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1292 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1294 #ifdef TRUSTED_CONFIG_LIST
1295 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1297 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1301 show_string(is_stdout, g);
1302 store_reset(reset_point);
1306 /*************************************************
1307 * Show auxiliary information about Exim *
1308 *************************************************/
1311 show_exim_information(enum commandline_info request, FILE *stream)
1316 fprintf(stream, "Oops, something went wrong.\n");
1320 "The -bI: flag takes a string indicating which information to provide.\n"
1321 "If the string is not recognised, you'll get this help (on stderr).\n"
1323 " exim -bI:help this information\n"
1324 " exim -bI:dscp list of known dscp value keywords\n"
1325 " exim -bI:sieve list of supported sieve extensions\n"
1329 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1330 fprintf(stream, "%s\n", *pp);
1333 dscp_list_to_stream(stream);
1339 /*************************************************
1340 * Quote a local part *
1341 *************************************************/
1343 /* This function is used when a sender address or a From: or Sender: header
1344 line is being created from the caller's login, or from an authenticated_id. It
1345 applies appropriate quoting rules for a local part.
1347 Argument: the local part
1348 Returns: the local part, quoted if necessary
1352 local_part_quote(uschar *lpart)
1354 BOOL needs_quote = FALSE;
1357 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1359 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1360 (*t != '.' || t == lpart || t[1] == 0);
1363 if (!needs_quote) return lpart;
1365 g = string_catn(NULL, US"\"", 1);
1369 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1372 g = string_cat(g, lpart);
1375 g = string_catn(g, lpart, nq - lpart);
1376 g = string_catn(g, US"\\", 1);
1377 g = string_catn(g, nq, 1);
1381 g = string_catn(g, US"\"", 1);
1382 return string_from_gstring(g);
1388 /*************************************************
1389 * Load readline() functions *
1390 *************************************************/
1392 /* This function is called from testing executions that read data from stdin,
1393 but only when running as the calling user. Currently, only -be does this. The
1394 function loads the readline() function library and passes back the functions.
1395 On some systems, it needs the curses library, so load that too, but try without
1396 it if loading fails. All this functionality has to be requested at build time.
1399 fn_readline_ptr pointer to where to put the readline pointer
1400 fn_addhist_ptr pointer to where to put the addhistory function
1402 Returns: the dlopen handle or NULL on failure
1406 set_readline(char * (**fn_readline_ptr)(const char *),
1407 void (**fn_addhist_ptr)(const char *))
1410 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1412 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1413 if (dlhandle_curses) dlclose(dlhandle_curses);
1417 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1418 * char * readline (const char *prompt);
1419 * void add_history (const char *string);
1421 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1422 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1425 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1433 /*************************************************
1434 * Get a line from stdin for testing things *
1435 *************************************************/
1437 /* This function is called when running tests that can take a number of lines
1438 of input (for example, -be and -bt). It handles continuations and trailing
1439 spaces. And prompting and a blank line output on eof. If readline() is in use,
1440 the arguments are non-NULL and provide the relevant functions.
1443 fn_readline readline function or NULL
1444 fn_addhist addhist function or NULL
1446 Returns: pointer to dynamic memory, or NULL at end of file
1450 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1453 BOOL had_input = FALSE;
1455 if (!fn_readline) { printf("> "); fflush(stdout); }
1457 for (int i = 0;; i++)
1459 uschar buffer[1024];
1463 char *readline_line = NULL;
1466 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1467 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1468 p = US readline_line;
1473 /* readline() not in use */
1476 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1480 /* Handle the line */
1483 ss = p + Ustrlen(p);
1484 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1487 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1489 g = string_catn(g, p, ss - p);
1492 if (fn_readline) free(readline_line);
1495 /* g can only be NULL if ss==p */
1496 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1499 --g->ptr; /* drop the \ */
1502 if (had_input) return g ? string_from_gstring(g) : US"";
1509 /*************************************************
1510 * Output usage information for the program *
1511 *************************************************/
1513 /* This function is called when there are no recipients
1514 or a specific --help argument was added.
1517 progname information on what name we were called by
1519 Returns: DOES NOT RETURN
1523 exim_usage(uschar *progname)
1526 /* Handle specific program invocation variants */
1527 if (Ustrcmp(progname, US"-mailq") == 0)
1529 "mailq - list the contents of the mail queue\n\n"
1530 "For a list of options, see the Exim documentation.\n");
1532 /* Generic usage - we output this whatever happens */
1534 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1535 "not directly from a shell command line. Options and/or arguments control\n"
1536 "what it does when called. For a list of options, see the Exim documentation.\n");
1541 /*************************************************
1542 * Validate that the macros given are okay *
1543 *************************************************/
1545 /* Typically, Exim will drop privileges if macros are supplied. In some
1546 cases, we want to not do so.
1548 Arguments: opt_D_used - true if the commandline had a "-D" option
1549 Returns: true if trusted, false otherwise
1553 macros_trusted(BOOL opt_D_used)
1555 #ifdef WHITELIST_D_MACROS
1556 uschar *whitelisted, *end, *p, **whites;
1557 int white_count, i, n;
1559 BOOL prev_char_item, found;
1564 #ifndef WHITELIST_D_MACROS
1568 /* We only trust -D overrides for some invoking users:
1569 root, the exim run-time user, the optional config owner user.
1570 I don't know why config-owner would be needed, but since they can own the
1571 config files anyway, there's no security risk to letting them override -D. */
1572 if ( ! ((real_uid == root_uid)
1573 || (real_uid == exim_uid)
1574 #ifdef CONFIGURE_OWNER
1575 || (real_uid == config_uid)
1579 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1583 /* Get a list of macros which are whitelisted */
1584 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1585 prev_char_item = FALSE;
1587 for (p = whitelisted; *p != '\0'; ++p)
1589 if (*p == ':' || isspace(*p))
1594 prev_char_item = FALSE;
1597 if (!prev_char_item)
1598 prev_char_item = TRUE;
1605 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1606 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1611 if (i == white_count)
1613 while (*p != '\0' && p < end)
1619 /* The list of commandline macros should be very short.
1620 Accept the N*M complexity. */
1621 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1624 for (uschar ** w = whites; *w; ++w)
1625 if (Ustrcmp(*w, m->name) == 0)
1632 if (!m->replacement)
1634 if ((len = m->replen) == 0)
1636 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1639 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1645 /*************************************************
1646 * Expansion testing *
1647 *************************************************/
1649 /* Expand and print one item, doing macro-processing.
1652 item line for expansion
1656 expansion_test_line(const uschar * line)
1662 Ustrncpy(big_buffer, line, big_buffer_size);
1663 big_buffer[big_buffer_size-1] = '\0';
1664 len = Ustrlen(big_buffer);
1666 (void) macros_expand(0, &len, &dummy_macexp);
1668 if (isupper(big_buffer[0]))
1670 if (macro_read_assignment(big_buffer))
1671 printf("Defined macro '%s'\n", mlast->name);
1673 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1674 printf("%s\n", acl_standalone_setvar(big_buffer+4));
1676 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1677 else printf("Failed: %s\n", expand_string_message);
1681 /* reset regex expansion variables */
1683 regex_vars_clear(void)
1685 regex_match_string = NULL;
1686 for (int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
1693 /*************************************************
1694 * Entry point and high-level code *
1695 *************************************************/
1697 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1698 the appropriate action. All the necessary functions are present in the one
1699 binary. I originally thought one should split it up, but it turns out that so
1700 much of the apparatus is needed in each chunk that one might as well just have
1701 it all available all the time, which then makes the coding easier as well.
1704 argc count of entries in argv
1705 argv argument strings, with argv[0] being the program name
1707 Returns: EXIT_SUCCESS if terminated successfully
1708 EXIT_FAILURE otherwise, except when a message has been sent
1709 to the sender, and -oee was given
1713 main(int argc, char **cargv)
1715 uschar **argv = USS cargv;
1716 int arg_receive_timeout = -1;
1717 int arg_smtp_receive_timeout = -1;
1718 int arg_error_handling = error_handling;
1719 int filter_sfd = -1;
1720 int filter_ufd = -1;
1723 int list_queue_option = 0;
1725 int msg_action_arg = -1;
1726 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1727 int queue_only_reason = 0;
1729 int perl_start_option = 0;
1731 int recipients_arg = argc;
1732 int sender_address_domain = 0;
1733 int test_retry_arg = -1;
1734 int test_rewrite_arg = -1;
1735 gid_t original_egid;
1736 BOOL arg_queue_only = FALSE;
1737 BOOL bi_option = FALSE;
1738 BOOL checking = FALSE;
1739 BOOL count_queue = FALSE;
1740 BOOL expansion_test = FALSE;
1741 BOOL extract_recipients = FALSE;
1742 BOOL flag_G = FALSE;
1743 BOOL flag_n = FALSE;
1744 BOOL forced_delivery = FALSE;
1745 BOOL f_end_dot = FALSE;
1746 BOOL deliver_give_up = FALSE;
1747 BOOL list_queue = FALSE;
1748 BOOL list_options = FALSE;
1749 BOOL list_config = FALSE;
1750 BOOL local_queue_only;
1751 BOOL one_msg_action = FALSE;
1752 BOOL opt_D_used = FALSE;
1753 BOOL queue_only_set = FALSE;
1754 BOOL receiving_message = TRUE;
1755 BOOL sender_ident_set = FALSE;
1756 BOOL session_local_queue_only;
1758 BOOL removed_privilege = FALSE;
1759 BOOL usage_wanted = FALSE;
1760 BOOL verify_address_mode = FALSE;
1761 BOOL verify_as_sender = FALSE;
1762 BOOL rcpt_verify_quota = FALSE;
1763 BOOL version_printed = FALSE;
1764 uschar *alias_arg = NULL;
1765 uschar *called_as = US"";
1766 uschar *cmdline_syslog_name = NULL;
1767 uschar *start_queue_run_id = NULL;
1768 uschar *stop_queue_run_id = NULL;
1769 uschar *expansion_test_message = NULL;
1770 const uschar *ftest_domain = NULL;
1771 const uschar *ftest_localpart = NULL;
1772 const uschar *ftest_prefix = NULL;
1773 const uschar *ftest_suffix = NULL;
1774 uschar *log_oneline = NULL;
1775 uschar *malware_test_file = NULL;
1776 uschar *real_sender_address;
1777 uschar *originator_home = US"/";
1781 struct stat statbuf;
1782 pid_t passed_qr_pid = (pid_t)0;
1783 int passed_qr_pipe = -1;
1784 gid_t group_list[EXIM_GROUPLIST_SIZE];
1786 /* For the -bI: flag */
1787 enum commandline_info info_flag = CMDINFO_NONE;
1788 BOOL info_stdout = FALSE;
1790 /* Possible options for -R and -S */
1792 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1794 /* Need to define this in case we need to change the environment in order
1795 to get rid of a bogus time zone. We have to make it char rather than uschar
1796 because some OS define it in /usr/include/unistd.h. */
1798 extern char **environ;
1800 #ifdef MEASURE_TIMING
1801 (void)gettimeofday(×tamp_startup, NULL);
1804 store_init(); /* Initialise the memory allocation susbsystem */
1805 pcre_init(); /* Set up memory handling for pcre */
1807 /* If the Exim user and/or group and/or the configuration file owner/group were
1808 defined by ref:name at build time, we must now find the actual uid/gid values.
1809 This is a feature to make the lives of binary distributors easier. */
1811 #ifdef EXIM_USERNAME
1812 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1815 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1817 /* If ref:name uses a number as the name, route_finduser() returns
1818 TRUE with exim_uid set and pw coerced to NULL. */
1820 exim_gid = pw->pw_gid;
1821 #ifndef EXIM_GROUPNAME
1824 "exim: ref:name should specify a usercode, not a group.\n"
1825 "exim: can't let you get away with it unless you also specify a group.\n");
1829 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1832 #ifdef EXIM_GROUPNAME
1833 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1834 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1837 #ifdef CONFIGURE_OWNERNAME
1838 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1839 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1840 CONFIGURE_OWNERNAME);
1843 /* We default the system_filter_user to be the Exim run-time user, as a
1844 sane non-root value. */
1845 system_filter_uid = exim_uid;
1847 #ifdef CONFIGURE_GROUPNAME
1848 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1849 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1850 CONFIGURE_GROUPNAME);
1853 /* In the Cygwin environment, some initialization used to need doing.
1854 It was fudged in by means of this macro; now no longer but we'll leave
1855 it in case of others. */
1861 /* Check a field which is patched when we are running Exim within its
1862 testing harness; do a fast initial check, and then the whole thing. */
1864 f.running_in_test_harness =
1865 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1866 if (f.running_in_test_harness)
1869 /* Protect against abusive argv[0] */
1870 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1871 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1873 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1874 at the start of a program; however, it seems that some environments do not
1875 follow this. A "strange" locale can affect the formatting of timestamps, so we
1878 setlocale(LC_ALL, "C");
1880 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1882 #ifdef _POSIX_MONOTONIC_CLOCK
1886 /* Set up the default handler for timing using alarm(). */
1888 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1890 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1891 because store_malloc writes a log entry on failure. */
1893 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1894 exim_fail("exim: failed to get store for log buffer\n");
1896 /* Initialize the default log options. */
1898 bits_set(log_selector, log_selector_size, log_default);
1900 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1901 NULL when the daemon is run and the file is closed. We have to use this
1902 indirection, because some systems don't allow writing to the variable "stderr".
1905 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1907 /* Ensure there is a big buffer for temporary use in several places. It is put
1908 in malloc store so that it can be freed for enlargement if necessary. */
1910 big_buffer = store_malloc(big_buffer_size);
1912 /* Set up the handler for the data request signal, and set the initial
1913 descriptive text. */
1915 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1916 set_process_info("initializing");
1917 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1920 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1921 sigaction(SIGSEGV, &act, NULL);
1924 signal(SIGSEGV, segv_handler); /* log faults */
1927 /* If running in a dockerized environment, the TERM signal is only
1928 delegated to the PID 1 if we request it by setting an signal handler */
1929 if (getpid() == 1) signal(SIGTERM, term_handler);
1931 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1932 in the daemon code. For the rest of Exim's uses, we ignore it. */
1934 signal(SIGHUP, SIG_IGN);
1936 /* We don't want to die on pipe errors as the code is written to handle
1937 the write error instead. */
1939 signal(SIGPIPE, SIG_IGN);
1941 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1942 set to SIG_IGN. This causes subprocesses that complete before the parent
1943 process waits for them not to hang around, so when Exim calls wait(), nothing
1944 is there. The wait() code has been made robust against this, but let's ensure
1945 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1946 ending status. We use sigaction rather than plain signal() on those OS where
1947 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1948 problem on AIX with this.) */
1952 struct sigaction act;
1953 act.sa_handler = SIG_DFL;
1954 sigemptyset(&(act.sa_mask));
1956 sigaction(SIGCHLD, &act, NULL);
1959 signal(SIGCHLD, SIG_DFL);
1962 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1967 /* Set up the version number. Set up the leading 'E' for the external form of
1968 message ids, set the pointer to the internal form, and initialize it to
1969 indicate no message being processed. */
1972 message_id_option[0] = '-';
1973 message_id_external = message_id_option + 1;
1974 message_id_external[0] = 'E';
1975 message_id = message_id_external + 1;
1978 /* Set the umask to zero so that any files Exim creates using open() are
1979 created with the modes that it specifies. NOTE: Files created with fopen() have
1980 a problem, which was not recognized till rather late (February 2006). With this
1981 umask, such files will be world writeable. (They are all content scanning files
1982 in the spool directory, which isn't world-accessible, so this is not a
1983 disaster, but it's untidy.) I don't want to change this overall setting,
1984 however, because it will interact badly with the open() calls. Instead, there's
1985 now a function called modefopen() that fiddles with the umask while calling
1990 /* Precompile the regular expression for matching a message id. Keep this in
1991 step with the code that generates ids in the accept.c module. We need to do
1992 this here, because the -M options check their arguments for syntactic validity
1993 using mac_ismsgid, which uses this. */
1996 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
1998 /* Precompile the regular expression that is used for matching an SMTP error
1999 code, possibly extended, at the start of an error message. Note that the
2000 terminating whitespace character is included. */
2003 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2006 #ifdef WHITELIST_D_MACROS
2007 /* Precompile the regular expression used to filter the content of macros
2008 given to -D for permissibility. */
2010 regex_whitelisted_macro =
2011 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2014 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2015 this seems to be a generally accepted convention, since one finds symbolic
2016 links called "mailq" in standard OS configurations. */
2018 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2019 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2022 receiving_message = FALSE;
2023 called_as = US"-mailq";
2026 /* If the program is called as "rmail" treat it as equivalent to
2027 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2028 i.e. preventing a single dot on a line from terminating the message, and
2029 returning with zero return code, even in cases of error (provided an error
2030 message has been sent). */
2032 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2033 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2036 called_as = US"-rmail";
2037 errors_sender_rc = EXIT_SUCCESS;
2040 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2041 this is a smail convention. */
2043 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2044 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2046 smtp_input = smtp_batched_input = TRUE;
2047 called_as = US"-rsmtp";
2050 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2051 this is a smail convention. */
2053 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2054 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2057 receiving_message = FALSE;
2058 called_as = US"-runq";
2061 /* If the program is called as "newaliases" treat it as equivalent to
2062 "exim -bi"; this is a sendmail convention. */
2064 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2065 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2068 receiving_message = FALSE;
2069 called_as = US"-newaliases";
2072 /* Save the original effective uid for a couple of uses later. It should
2073 normally be root, but in some esoteric environments it may not be. */
2075 original_euid = geteuid();
2076 original_egid = getegid();
2078 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2079 to be the same as the real ones. This makes a difference only if Exim is setuid
2080 (or setgid) to something other than root, which could be the case in some
2081 special configurations. */
2083 real_uid = getuid();
2084 real_gid = getgid();
2086 if (real_uid == root_uid)
2088 if ((rv = setgid(real_gid)))
2089 exim_fail("exim: setgid(%ld) failed: %s\n",
2090 (long int)real_gid, strerror(errno));
2091 if ((rv = setuid(real_uid)))
2092 exim_fail("exim: setuid(%ld) failed: %s\n",
2093 (long int)real_uid, strerror(errno));
2096 /* If neither the original real uid nor the original euid was root, Exim is
2097 running in an unprivileged state. */
2099 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2101 /* For most of the args-parsing we need to use permanent pool memory */
2103 int old_pool = store_pool;
2104 store_pool = POOL_PERM;
2106 /* Scan the program's arguments. Some can be dealt with right away; others are
2107 simply recorded for checking and handling afterwards. Do a high-level switch
2108 on the second character (the one after '-'), to save some effort. */
2110 for (i = 1; i < argc; i++)
2112 BOOL badarg = FALSE;
2113 uschar * arg = argv[i];
2117 /* An argument not starting with '-' is the start of a recipients list;
2118 break out of the options-scanning loop. */
2126 /* An option consisting of -- terminates the options */
2128 if (Ustrcmp(arg, "--") == 0)
2130 recipients_arg = i + 1;
2134 /* Handle flagged options */
2136 switchchar = arg[1];
2139 /* Make all -ex options synonymous with -oex arguments, since that
2140 is assumed by various callers. Also make -qR options synonymous with -R
2141 options, as that seems to be required as well. Allow for -qqR too, and
2142 the same for -S options. */
2144 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2145 Ustrncmp(arg+1, "qR", 2) == 0 ||
2146 Ustrncmp(arg+1, "qS", 2) == 0)
2148 switchchar = arg[2];
2151 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2153 switchchar = arg[3];
2155 f.queue_2stage = TRUE;
2158 /* Make -r synonymous with -f, since it is a documented alias */
2160 else if (arg[1] == 'r') switchchar = 'f';
2162 /* Make -ov synonymous with -v */
2164 else if (Ustrcmp(arg, "-ov") == 0)
2170 /* deal with --option_aliases */
2171 else if (switchchar == '-')
2173 if (Ustrcmp(argrest, "help") == 0)
2175 usage_wanted = TRUE;
2178 else if (Ustrcmp(argrest, "version") == 0)
2185 /* High-level switch on active initial letter */
2190 /* sendmail uses -Ac and -Am to control which .cf file is used;
2193 if (!*argrest) { badarg = TRUE; break; }
2196 BOOL ignore = FALSE;
2201 if (*(argrest + 1) == '\0')
2205 if (!ignore) badarg = TRUE;
2209 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2210 so has no need of it. */
2213 if (!*argrest) i++; /* Skip over the type */
2219 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2223 /* -bd: Run in daemon mode, awaiting SMTP connections.
2224 -bdf: Ditto, but in the foreground.
2227 f.daemon_listen = f.daemon_scion = TRUE;
2228 if (*argrest == 'f') f.background_daemon = FALSE;
2229 else if (*argrest) badarg = TRUE;
2232 /* -be: Run in expansion test mode
2233 -bem: Ditto, but read a message from a file first
2236 expansion_test = checking = TRUE;
2237 if (*argrest == 'm')
2239 if (++i >= argc) { badarg = TRUE; break; }
2240 expansion_test_message = argv[i];
2243 if (*argrest) badarg = TRUE;
2246 /* -bF: Run system filter test */
2248 filter_test |= checking = FTEST_SYSTEM;
2249 if (*argrest) badarg = TRUE;
2250 else if (++i < argc) filter_test_sfile = argv[i];
2251 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2254 /* -bf: Run user filter test
2255 -bfd: Set domain for filter testing
2256 -bfl: Set local part for filter testing
2257 -bfp: Set prefix for filter testing
2258 -bfs: Set suffix for filter testing
2263 filter_test |= checking = FTEST_USER;
2264 if (++i < argc) filter_test_ufile = argv[i];
2265 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2270 exim_fail("exim: string expected after %s\n", arg);
2271 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2272 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2273 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2274 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2279 /* -bh: Host checking - an IP address must follow. */
2281 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2283 if (++i >= argc) { badarg = TRUE; break; }
2284 sender_host_address = string_copy_taint(
2285 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2287 host_checking = checking = f.log_testing_mode = TRUE;
2288 f.host_checking_callout = *argrest == 'c';
2289 message_logs = FALSE;
2294 /* -bi: This option is used by sendmail to initialize *the* alias file,
2295 though it has the -oA option to specify a different file. Exim has no
2296 concept of *the* alias file, but since Sun's YP make script calls
2297 sendmail this way, some support must be provided. */
2299 if (!*argrest) bi_option = TRUE;
2303 /* -bI: provide information, of the type to follow after a colon.
2304 This is an Exim flag. */
2306 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2308 uschar *p = argrest+1;
2309 info_flag = CMDINFO_HELP;
2311 if (strcmpic(p, CUS"sieve") == 0)
2313 info_flag = CMDINFO_SIEVE;
2316 else if (strcmpic(p, CUS"dscp") == 0)
2318 info_flag = CMDINFO_DSCP;
2321 else if (strcmpic(p, CUS"help") == 0)
2327 /* -bm: Accept and deliver message - the default option. Reinstate
2328 receiving_message, which got turned off for all -b options.
2329 -bmalware: test the filename given for malware */
2331 if (!*argrest) receiving_message = TRUE;
2332 else if (Ustrcmp(argrest, "alware") == 0)
2334 if (++i >= argc) { badarg = TRUE; break; }
2336 malware_test_file = argv[i];
2341 /* -bnq: For locally originating messages, do not qualify unqualified
2342 addresses. In the envelope, this causes errors; in header lines they
2345 if (Ustrcmp(argrest, "q") == 0)
2347 f.allow_unqualified_sender = FALSE;
2348 f.allow_unqualified_recipient = FALSE;
2353 /* -bpxx: List the contents of the mail queue, in various forms. If
2354 the option is -bpc, just a queue count is needed. Otherwise, if the
2355 first letter after p is r, then order is random. */
2357 if (*argrest == 'c')
2360 if (*++argrest) badarg = TRUE;
2364 if (*argrest == 'r')
2366 list_queue_option = 8;
2369 else list_queue_option = 0;
2373 /* -bp: List the contents of the mail queue, top-level only */
2377 /* -bpu: List the contents of the mail queue, top-level undelivered */
2379 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2381 /* -bpa: List the contents of the mail queue, including all delivered */
2383 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2385 /* Unknown after -bp[r] */
2391 /* -bP: List the configuration variables given as the address list.
2392 Force -v, so configuration errors get displayed. */
2395 /* -bP config: we need to setup here, because later,
2396 when list_options is checked, the config is read already */
2399 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2402 readconf_save_config(version_string);
2406 list_options = TRUE;
2407 debug_selector |= D_v;
2408 debug_file = stderr;
2412 /* -brt: Test retry configuration lookup */
2414 if (Ustrcmp(argrest, "t") == 0)
2417 test_retry_arg = i + 1;
2421 /* -brw: Test rewrite configuration */
2423 else if (Ustrcmp(argrest, "w") == 0)
2426 test_rewrite_arg = i + 1;
2432 /* -bS: Read SMTP commands on standard input, but produce no replies -
2433 all errors are reported by sending messages. */
2436 smtp_input = smtp_batched_input = receiving_message = TRUE;
2440 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2441 on standard output. */
2443 if (!*argrest) smtp_input = receiving_message = TRUE;
2447 /* -bt: address testing mode */
2450 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2454 /* -bv: verify addresses */
2457 verify_address_mode = checking = f.log_testing_mode = TRUE;
2459 /* -bvs: verify sender addresses */
2461 else if (Ustrcmp(argrest, "s") == 0)
2463 verify_address_mode = checking = f.log_testing_mode = TRUE;
2464 verify_as_sender = TRUE;
2469 /* -bV: Print version string and support details */
2473 printf("Exim version %s #%s built %s\n", version_string,
2474 version_cnumber, version_date);
2475 printf("%s\n", CS version_copyright);
2476 version_printed = TRUE;
2477 show_whats_supported(TRUE);
2478 f.log_testing_mode = TRUE;
2483 /* -bw: inetd wait mode, accept a listening socket as stdin */
2485 f.inetd_wait_mode = TRUE;
2486 f.background_daemon = FALSE;
2487 f.daemon_listen = f.daemon_scion = TRUE;
2489 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2490 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2501 /* -C: change configuration file list; ignore if it isn't really
2502 a change! Enforce a prefix check if required. */
2506 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2507 if (Ustrcmp(config_main_filelist, argrest) != 0)
2509 #ifdef ALT_CONFIG_PREFIX
2511 int len = Ustrlen(ALT_CONFIG_PREFIX);
2512 const uschar *list = argrest;
2514 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2515 while((filename = string_nextinlist(&list, &sep, big_buffer,
2517 if ( ( Ustrlen(filename) < len
2518 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2519 || Ustrstr(filename, "/../") != NULL
2521 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2523 exim_fail("-C Permission denied\n");
2525 if (real_uid != root_uid)
2527 #ifdef TRUSTED_CONFIG_LIST
2529 if (real_uid != exim_uid
2530 #ifdef CONFIGURE_OWNER
2531 && real_uid != config_uid
2534 f.trusted_config = FALSE;
2537 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2540 struct stat statbuf;
2542 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2543 (statbuf.st_uid != root_uid /* owner not root */
2544 #ifdef CONFIGURE_OWNER
2545 && statbuf.st_uid != config_uid /* owner not the special one */
2548 (statbuf.st_gid != root_gid /* group not root */
2549 #ifdef CONFIGURE_GROUP
2550 && statbuf.st_gid != config_gid /* group not the special one */
2552 && (statbuf.st_mode & 020) != 0 /* group writeable */
2554 (statbuf.st_mode & 2) != 0) /* world writeable */
2556 f.trusted_config = FALSE;
2561 /* Well, the trust list at least is up to scratch... */
2563 uschar *trusted_configs[32];
2566 int old_pool = store_pool;
2567 store_pool = POOL_MAIN;
2569 reset_point = store_mark();
2570 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2572 uschar *start = big_buffer, *nl;
2573 while (*start && isspace(*start))
2577 nl = Ustrchr(start, '\n');
2580 trusted_configs[nr_configs++] = string_copy(start);
2581 if (nr_configs == nelem(trusted_configs))
2589 const uschar *list = argrest;
2591 while (f.trusted_config && (filename = string_nextinlist(&list,
2592 &sep, big_buffer, big_buffer_size)))
2594 for (i=0; i < nr_configs; i++)
2595 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2597 if (i == nr_configs)
2599 f.trusted_config = FALSE;
2604 else /* No valid prefixes found in trust_list file. */
2605 f.trusted_config = FALSE;
2606 store_reset(reset_point);
2607 store_pool = old_pool;
2610 else /* Could not open trust_list file. */
2611 f.trusted_config = FALSE;
2614 /* Not root; don't trust config */
2615 f.trusted_config = FALSE;
2619 config_main_filelist = argrest;
2620 f.config_changed = TRUE;
2625 /* -D: set up a macro definition */
2628 #ifdef DISABLE_D_OPTION
2629 exim_fail("exim: -D is not available in this Exim binary\n");
2635 uschar *s = argrest;
2638 while (isspace(*s)) s++;
2640 if (*s < 'A' || *s > 'Z')
2641 exim_fail("exim: macro name set by -D must start with "
2642 "an upper case letter\n");
2644 while (isalnum(*s) || *s == '_')
2646 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2650 if (ptr == 0) { badarg = TRUE; break; }
2651 while (isspace(*s)) s++;
2654 if (*s++ != '=') { badarg = TRUE; break; }
2655 while (isspace(*s)) s++;
2658 for (m = macros_user; m; m = m->next)
2659 if (Ustrcmp(m->name, name) == 0)
2660 exim_fail("exim: duplicated -D in command line\n");
2662 m = macro_create(name, s, TRUE);
2664 if (clmacro_count >= MAX_CLMACROS)
2665 exim_fail("exim: too many -D options on command line\n");
2666 clmacros[clmacro_count++] =
2667 string_sprintf("-D%s=%s", m->name, m->replacement);
2674 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2676 if (Ustrcmp(argrest, "ropcr") == 0)
2678 /* drop_cr = TRUE; */
2681 /* -dp: Set up a debug pretrigger buffer with given size. */
2683 else if (Ustrcmp(argrest, "p") == 0)
2687 debug_pretrigger_setup(argv[i]);
2689 /* -dt: Set a debug trigger selector */
2691 else if (Ustrncmp(argrest, "t=", 2) == 0)
2692 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2694 /* -d: Set debug level (see also -v below).
2695 If -dd is used, debugging subprocesses of the daemon is disabled. */
2699 /* Use an intermediate variable so that we don't set debugging while
2700 decoding the debugging bits. */
2702 unsigned int selector = D_default;
2705 if (*argrest == 'd')
2707 f.debug_daemon = TRUE;
2711 decode_bits(&selector, 1, debug_notall, argrest,
2712 debug_options, debug_options_count, US"debug", 0);
2713 debug_selector = selector;
2718 /* -E: This is a local error message. This option is not intended for
2719 external use at all, but is not restricted to trusted callers because it
2720 does no harm (just suppresses certain error messages) and if Exim is run
2721 not setuid root it won't always be trusted when it generates error
2722 messages using this option. If there is a message id following -E, point
2723 message_reference at it, for logging. */
2726 f.local_error_message = TRUE;
2727 if (mac_ismsgid(argrest)) message_reference = argrest;
2731 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2732 option, so it looks as if historically the -oex options are also callable
2733 without the leading -o. So we have to accept them. Before the switch,
2734 anything starting -oe has been converted to -e. Exim does not support all
2735 of the sendmail error options. */
2738 if (Ustrcmp(argrest, "e") == 0)
2740 arg_error_handling = ERRORS_SENDER;
2741 errors_sender_rc = EXIT_SUCCESS;
2743 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2744 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2745 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2746 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2751 /* -F: Set sender's full name, used instead of the gecos entry from
2752 the password file. Since users can usually alter their gecos entries,
2753 there's no security involved in using this instead. The data can follow
2754 the -F or be in the next argument. */
2758 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2759 originator_name = string_copy_taint(
2760 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2762 f.sender_name_forced = TRUE;
2766 /* -f: Set sender's address - this value is only actually used if Exim is
2767 run by a trusted user, or if untrusted_set_sender is set and matches the
2768 address, except that the null address can always be set by any user. The
2769 test for this happens later, when the value given here is ignored when not
2770 permitted. For an untrusted user, the actual sender is still put in Sender:
2771 if it doesn't match the From: header (unless no_local_from_check is set).
2772 The data can follow the -f or be in the next argument. The -r switch is an
2773 obsolete form of -f but since there appear to be programs out there that
2774 use anything that sendmail has ever supported, better accept it - the
2775 synonymizing is done before the switch above.
2777 At this stage, we must allow domain literal addresses, because we don't
2778 know what the setting of allow_domain_literals is yet. Ditto for trailing
2779 dots and strip_trailing_dot. */
2783 int dummy_start, dummy_end;
2786 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2787 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2789 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2792 uschar * temp = argrest + Ustrlen(argrest) - 1;
2793 while (temp >= argrest && isspace(*temp)) temp--;
2794 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2795 allow_domain_literals = TRUE;
2796 strip_trailing_dot = TRUE;
2798 allow_utf8_domains = TRUE;
2800 if (!(sender_address = parse_extract_address(argrest, &errmess,
2801 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2802 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2804 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2806 message_smtputf8 = string_is_utf8(sender_address);
2807 allow_utf8_domains = FALSE;
2809 allow_domain_literals = FALSE;
2810 strip_trailing_dot = FALSE;
2812 f.sender_address_forced = TRUE;
2816 /* -G: sendmail invocation to specify that it's a gateway submission and
2817 sendmail may complain about problems instead of fixing them.
2818 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2819 not at this time complain about problems. */
2825 /* -h: Set the hop count for an incoming message. Exim does not currently
2826 support this; it always computes it by counting the Received: headers.
2827 To put it in will require a change to the spool header file format. */
2831 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2832 if (!isdigit(*argrest)) badarg = TRUE;
2836 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2837 not to be documented for sendmail but mailx (at least) uses it) */
2840 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2844 /* -L: set the identifier used for syslog; equivalent to setting
2845 syslog_processname in the config file, but needs to be an admin option. */
2849 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2850 if ((sz = Ustrlen(argrest)) > 32)
2851 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2853 exim_fail("exim: the -L syslog name is too short\n");
2854 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2858 receiving_message = FALSE;
2860 /* -MC: continue delivery of another message via an existing open
2861 file descriptor. This option is used for an internal call by the
2862 smtp transport when there is a pending message waiting to go to an
2863 address to which it has got a connection. Five subsequent arguments are
2864 required: transport name, host name, IP address, sequence number, and
2865 message_id. Transports may decline to create new processes if the sequence
2866 number gets too big. The channel is stdin. This (-MC) must be the last
2867 argument. There's a subsequent check that the real-uid is privileged.
2869 If we are running in the test harness. delay for a bit, to let the process
2870 that set this one up complete. This makes for repeatability of the logging,
2873 if (Ustrcmp(argrest, "C") == 0)
2875 union sockaddr_46 interface_sock;
2876 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2879 exim_fail("exim: too many or too few arguments after -MC\n");
2881 if (msg_action_arg >= 0)
2882 exim_fail("exim: incompatible arguments\n");
2884 continue_transport = string_copy_taint(
2885 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2887 continue_hostname = string_copy_taint(
2888 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2890 continue_host_address = string_copy_taint(
2891 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2893 continue_sequence = Uatoi(argv[++i]);
2894 msg_action = MSG_DELIVER;
2895 msg_action_arg = ++i;
2896 forced_delivery = TRUE;
2897 queue_run_pid = passed_qr_pid;
2898 queue_run_pipe = passed_qr_pipe;
2900 if (!mac_ismsgid(argv[i]))
2901 exim_fail("exim: malformed message id %s after -MC option\n",
2904 /* Set up $sending_ip_address and $sending_port, unless proxied */
2906 if (!continue_proxy_cipher)
2907 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2909 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2912 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2915 testharness_pause_ms(500);
2919 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2923 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2924 precedes -MC (see above). The flag indicates that the host to which
2925 Exim is connected has accepted an AUTH sequence. */
2927 case 'A': f.smtp_authenticated = TRUE; break;
2929 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2930 that exim is connected to supports the esmtp extension DSN */
2932 case 'D': smtp_peer_options |= OPTION_DSN; break;
2934 /* -MCd: for debug, set a process-purpose string */
2936 case 'd': if (++i < argc)
2937 process_purpose = string_copy_taint(
2938 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2943 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2944 from the commandline should be tainted - but we will need an untainted
2945 value for the spoolfile when doing a -odi delivery process. */
2947 case 'G': if (++i < argc) queue_name = string_copy_taint(
2948 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2953 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2955 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2957 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2958 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2959 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2961 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2963 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2968 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2969 it preceded -MC (see above) */
2971 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2973 #ifdef SUPPORT_SOCKS
2974 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2975 case 'p': proxy_session = TRUE;
2978 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
2981 proxy_local_port = Uatoi(argv[i]);
2984 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
2987 proxy_external_port = Uatoi(argv[i]);
2993 /* -MCQ: pass on the pid of the queue-running process that started
2994 this chain of deliveries and the fd of its synchronizing pipe; this
2995 is useful only when it precedes -MC (see above) */
2997 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2999 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3003 /* -MCq: do a quota check on the given recipient for the given size
3004 of message. Separate from -MC. */
3005 case 'q': rcpt_verify_quota = TRUE;
3006 if (++i < argc) message_size = Uatoi(argv[i]);
3010 /* -MCS: set the smtp_use_size flag; this is useful only when it
3011 precedes -MC (see above) */
3013 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3016 /* -MCs: used with -MCt; SNI was sent */
3017 /* -MCr: ditto, DANE */
3020 case 's': if (++i < argc)
3022 continue_proxy_sni = string_copy_taint(
3023 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3025 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3030 /* -MCt: similar to -MCT below but the connection is still open
3031 via a proxy process which handles the TLS context and coding.
3032 Require three arguments for the proxied local address and port,
3033 and the TLS cipher. */
3035 case 't': if (++i < argc)
3036 sending_ip_address = string_copy_taint(
3037 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3041 sending_port = (int)(Uatol(argv[i]));
3044 continue_proxy_cipher = string_copy_taint(
3045 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3050 /* -MCT: set the tls_offered flag; this is useful only when it
3051 precedes -MC (see above). The flag indicates that the host to which
3052 Exim is connected has offered TLS support. */
3054 case 'T': smtp_peer_options |= OPTION_TLS; break;
3057 default: badarg = TRUE; break;
3062 /* -M[x]: various operations on the following list of message ids:
3063 -M deliver the messages, ignoring next retry times and thawing
3064 -Mc deliver the messages, checking next retry times, no thawing
3065 -Mf freeze the messages
3066 -Mg give up on the messages
3067 -Mt thaw the messages
3068 -Mrm remove the messages
3069 In the above cases, this must be the last option. There are also the
3070 following options which are followed by a single message id, and which
3071 act on that message. Some of them use the "recipient" addresses as well.
3072 -Mar add recipient(s)
3073 -MG move to a different queue
3074 -Mmad mark all recipients delivered
3075 -Mmd mark recipients(s) delivered
3077 -Mset load a message for use with -be
3079 -Mvc show copy (of whole message, in RFC 2822 format)
3086 msg_action = MSG_DELIVER;
3087 forced_delivery = f.deliver_force_thaw = TRUE;
3089 else if (Ustrcmp(argrest, "ar") == 0)
3091 msg_action = MSG_ADD_RECIPIENT;
3092 one_msg_action = TRUE;
3094 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3095 else if (Ustrcmp(argrest, "es") == 0)
3097 msg_action = MSG_EDIT_SENDER;
3098 one_msg_action = TRUE;
3100 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3101 else if (Ustrcmp(argrest, "g") == 0)
3103 msg_action = MSG_DELIVER;
3104 deliver_give_up = TRUE;
3106 else if (Ustrcmp(argrest, "G") == 0)
3108 msg_action = MSG_SETQUEUE;
3109 queue_name_dest = string_copy_taint(
3110 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3113 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3114 else if (Ustrcmp(argrest, "md") == 0)
3116 msg_action = MSG_MARK_DELIVERED;
3117 one_msg_action = TRUE;
3119 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3120 else if (Ustrcmp(argrest, "set") == 0)
3122 msg_action = MSG_LOAD;
3123 one_msg_action = TRUE;
3125 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3126 else if (Ustrcmp(argrest, "vb") == 0)
3128 msg_action = MSG_SHOW_BODY;
3129 one_msg_action = TRUE;
3131 else if (Ustrcmp(argrest, "vc") == 0)
3133 msg_action = MSG_SHOW_COPY;
3134 one_msg_action = TRUE;
3136 else if (Ustrcmp(argrest, "vh") == 0)
3138 msg_action = MSG_SHOW_HEADER;
3139 one_msg_action = TRUE;
3141 else if (Ustrcmp(argrest, "vl") == 0)
3143 msg_action = MSG_SHOW_LOG;
3144 one_msg_action = TRUE;
3146 else { badarg = TRUE; break; }
3148 /* All the -Mxx options require at least one message id. */
3150 msg_action_arg = i + 1;
3151 if (msg_action_arg >= argc)
3152 exim_fail("exim: no message ids given after %s option\n", arg);
3154 /* Some require only message ids to follow */
3156 if (!one_msg_action)
3158 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3159 exim_fail("exim: malformed message id %s after %s option\n",
3161 goto END_ARG; /* Remaining args are ids */
3164 /* Others require only one message id, possibly followed by addresses,
3165 which will be handled as normal arguments. */
3169 if (!mac_ismsgid(argv[msg_action_arg]))
3170 exim_fail("exim: malformed message id %s after %s option\n",
3171 argv[msg_action_arg], arg);
3177 /* Some programs seem to call the -om option without the leading o;
3178 for sendmail it askes for "me too". Exim always does this. */
3181 if (*argrest) badarg = TRUE;
3185 /* -N: don't do delivery - a debugging option that stops transports doing
3186 their thing. It implies debugging at the D_v level. */
3191 f.dont_deliver = TRUE;
3192 debug_selector |= D_v;
3193 debug_file = stderr;
3199 /* -n: This means "don't alias" in sendmail, apparently.
3200 For normal invocations, it has no effect.
3201 It may affect some other options. */
3207 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3208 option to the specified value. This form uses long names. We need to handle
3209 -O option=value and -Ooption=value. */
3214 exim_fail("exim: string expected after -O\n");
3220 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3223 if (!*(alias_arg = argrest))
3224 if (i+1 < argc) alias_arg = argv[++i];
3225 else exim_fail("exim: string expected after -oA\n");
3228 /* -oB: Set a connection message max value for remote deliveries */
3231 uschar * p = argrest;
3233 if (i+1 < argc && isdigit((argv[i+1][0])))
3237 connection_max_messages = 1;
3244 exim_fail("exim: number expected after -oB\n");
3245 connection_max_messages = Uatoi(p);
3250 /* -odb: background delivery */
3253 if (Ustrcmp(argrest, "b") == 0)
3255 f.synchronous_delivery = FALSE;
3256 arg_queue_only = FALSE;
3257 queue_only_set = TRUE;
3260 /* -odd: testsuite-only: add no inter-process delays */
3262 else if (Ustrcmp(argrest, "d") == 0)
3263 f.testsuite_delays = FALSE;
3265 /* -odf: foreground delivery (smail-compatible option); same effect as
3266 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3269 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3271 f.synchronous_delivery = TRUE;
3272 arg_queue_only = FALSE;
3273 queue_only_set = TRUE;
3276 /* -odq: queue only */
3278 else if (Ustrcmp(argrest, "q") == 0)
3280 f.synchronous_delivery = FALSE;
3281 arg_queue_only = TRUE;
3282 queue_only_set = TRUE;
3285 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3286 but no remote delivery */
3288 else if (Ustrcmp(argrest, "qs") == 0)
3290 f.queue_smtp = TRUE;
3291 arg_queue_only = FALSE;
3292 queue_only_set = TRUE;
3297 /* -oex: Sendmail error flags. As these are also accepted without the
3298 leading -o prefix, for compatibility with vacation and other callers,
3299 they are handled with -e above. */
3301 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3302 -oitrue: Another sendmail syntax for the same */
3305 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3310 /* -oM*: Set various characteristics for an incoming message; actually
3311 acted on for trusted callers only. */
3316 exim_fail("exim: data expected after -oM%s\n", argrest);
3318 /* -oMa: Set sender host address */
3320 if (Ustrcmp(argrest, "a") == 0)
3321 sender_host_address = string_copy_taint(
3322 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3325 /* -oMaa: Set authenticator name */
3327 else if (Ustrcmp(argrest, "aa") == 0)
3328 sender_host_authenticated = string_copy_taint(
3329 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3332 /* -oMas: setting authenticated sender */
3334 else if (Ustrcmp(argrest, "as") == 0)
3335 authenticated_sender = string_copy_taint(
3336 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3339 /* -oMai: setting authenticated id */
3341 else if (Ustrcmp(argrest, "ai") == 0)
3342 authenticated_id = string_copy_taint(
3343 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3346 /* -oMi: Set incoming interface address */
3348 else if (Ustrcmp(argrest, "i") == 0)
3349 interface_address = string_copy_taint(
3350 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3353 /* -oMm: Message reference */
3355 else if (Ustrcmp(argrest, "m") == 0)
3357 if (!mac_ismsgid(argv[i+1]))
3358 exim_fail("-oMm must be a valid message ID\n");
3359 if (!f.trusted_config)
3360 exim_fail("-oMm must be called by a trusted user/config\n");
3361 message_reference = argv[++i];
3364 /* -oMr: Received protocol */
3366 else if (Ustrcmp(argrest, "r") == 0)
3368 if (received_protocol)
3369 exim_fail("received_protocol is set already\n");
3371 received_protocol = string_copy_taint(
3372 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3375 /* -oMs: Set sender host name */
3377 else if (Ustrcmp(argrest, "s") == 0)
3378 sender_host_name = string_copy_taint(
3379 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3382 /* -oMt: Set sender ident */
3384 else if (Ustrcmp(argrest, "t") == 0)
3386 sender_ident_set = TRUE;
3387 sender_ident = string_copy_taint(
3388 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3392 /* Else a bad argument */
3399 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3400 seem to call this as -m (undocumented), so that is also accepted (see
3402 /* -oo: An ancient flag for old-style addresses which still seems to
3403 crop up in some calls (see in SCO). */
3407 if (*argrest) badarg = TRUE;
3410 /* -oP <name>: set pid file path for daemon
3411 -oPX: delete pid file of daemon */
3414 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3415 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3416 "(uid=%d euid=%d | %d)\n",
3417 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3418 if (!*argrest) override_pid_file_path = argv[++i];
3419 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3424 /* -or <n>: set timeout for non-SMTP acceptance
3425 -os <n>: set timeout for SMTP acceptance */
3430 int * tp = argrest[-1] == 'r'
3431 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3433 *tp = readconf_readtime(argrest, 0, FALSE);
3434 else if (i+1 < argc)
3435 *tp = readconf_readtime(argv[++i], 0, FALSE);
3438 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3442 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3443 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3446 if (*argrest) badarg = TRUE;
3447 else override_local_interfaces = string_copy_taint(
3448 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3452 /* -oY: Override creation of daemon notifier socket */
3455 if (*argrest) badarg = TRUE;
3456 else notifier_socket = NULL;
3459 /* Unknown -o argument */
3467 /* -ps: force Perl startup; -pd force delayed Perl startup */
3471 if (*argrest == 's' && argrest[1] == 0)
3473 perl_start_option = 1;
3476 if (*argrest == 'd' && argrest[1] == 0)
3478 perl_start_option = -1;
3483 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3484 which sets the host protocol and host name */
3487 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3491 uschar * hn = Ustrchr(argrest, ':');
3493 if (received_protocol)
3494 exim_fail("received_protocol is set already\n");
3497 received_protocol = string_copy_taint(
3498 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3502 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3503 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3504 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3511 receiving_message = FALSE;
3512 if (queue_interval >= 0)
3513 exim_fail("exim: -q specified more than once\n");
3515 /* -qq...: Do queue runs in a 2-stage manner */
3517 if (*argrest == 'q')
3519 f.queue_2stage = TRUE;
3523 /* -qi...: Do only first (initial) deliveries */
3525 if (*argrest == 'i')
3527 f.queue_run_first_delivery = TRUE;
3531 /* -qf...: Run the queue, forcing deliveries
3532 -qff..: Ditto, forcing thawing as well */
3534 if (*argrest == 'f')
3536 f.queue_run_force = TRUE;
3537 if (*++argrest == 'f')
3539 f.deliver_force_thaw = TRUE;
3544 /* -q[f][f]l...: Run the queue only on local deliveries */
3546 if (*argrest == 'l')
3548 f.queue_run_local = TRUE;
3552 /* -q[f][f][l][G<name>]... Work on the named queue */
3554 if (*argrest == 'G')
3557 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3558 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3559 queue_name = string_copyn(argrest, i);
3561 if (*argrest == '/') argrest++;
3564 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3565 only, optionally named, optionally starting from a given message id. */
3567 if (!(list_queue || count_queue))
3569 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3572 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3573 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3574 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3575 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3578 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3579 forced, optionally local only, optionally named. */
3581 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3583 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3587 case 'R': /* Synonymous with -qR... */
3589 const uschar *tainted_selectstr;
3591 receiving_message = FALSE;
3593 /* -Rf: As -R (below) but force all deliveries,
3594 -Rff: Ditto, but also thaw all frozen messages,
3595 -Rr: String is regex
3596 -Rrf: Regex and force
3597 -Rrff: Regex and force and thaw
3599 in all cases provided there are no further characters in this
3603 for (int i = 0; i < nelem(rsopts); i++)
3604 if (Ustrcmp(argrest, rsopts[i]) == 0)
3606 if (i != 2) f.queue_run_force = TRUE;
3607 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3608 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3609 argrest += Ustrlen(rsopts[i]);
3612 /* -R: Set string to match in addresses for forced queue run to
3613 pick out particular messages. */
3615 /* Avoid attacks from people providing very long strings, and do so before
3618 tainted_selectstr = argrest;
3619 else if (i+1 < argc)
3620 tainted_selectstr = argv[++i];
3622 exim_fail("exim: string expected after -R\n");
3623 deliver_selectstring = string_copy_taint(
3624 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3629 /* -r: an obsolete synonym for -f (see above) */
3632 /* -S: Like -R but works on sender. */
3634 case 'S': /* Synonymous with -qS... */
3636 const uschar *tainted_selectstr;
3638 receiving_message = FALSE;
3640 /* -Sf: As -S (below) but force all deliveries,
3641 -Sff: Ditto, but also thaw all frozen messages,
3642 -Sr: String is regex
3643 -Srf: Regex and force
3644 -Srff: Regex and force and thaw
3646 in all cases provided there are no further characters in this
3650 for (int i = 0; i < nelem(rsopts); i++)
3651 if (Ustrcmp(argrest, rsopts[i]) == 0)
3653 if (i != 2) f.queue_run_force = TRUE;
3654 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3655 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3656 argrest += Ustrlen(rsopts[i]);
3659 /* -S: Set string to match in addresses for forced queue run to
3660 pick out particular messages. */
3663 tainted_selectstr = argrest;
3664 else if (i+1 < argc)
3665 tainted_selectstr = argv[++i];
3667 exim_fail("exim: string expected after -S\n");
3668 deliver_selectstring_sender = string_copy_taint(
3669 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3674 /* -Tqt is an option that is exclusively for use by the testing suite.
3675 It is not recognized in other circumstances. It allows for the setting up
3676 of explicit "queue times" so that various warning/retry things can be
3677 tested. Otherwise variability of clock ticks etc. cause problems. */
3680 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3681 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3686 /* -t: Set flag to extract recipients from body of message. */
3689 if (!*argrest) extract_recipients = TRUE;
3691 /* -ti: Set flag to extract recipients from body of message, and also
3692 specify that dot does not end the message. */
3694 else if (Ustrcmp(argrest, "i") == 0)
3696 extract_recipients = TRUE;
3700 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3703 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3710 /* -U: This means "initial user submission" in sendmail, apparently. The
3711 doc claims that in future sendmail may refuse syntactically invalid
3712 messages instead of fixing them. For the moment, we just ignore it. */
3718 /* -v: verify things - this is a very low-level debugging */
3723 debug_selector |= D_v;
3724 debug_file = stderr;
3730 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3732 The -x flag tells the sendmail command that mail from a local
3733 mail program has National Language Support (NLS) extended characters
3734 in the body of the mail item. The sendmail command can send mail with
3735 extended NLS characters across networks that normally corrupts these
3738 As Exim is 8-bit clean, it just ignores this flag. */
3741 if (*argrest) badarg = TRUE;
3744 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3745 logs to that file. We swallow the parameter and otherwise ignore it. */
3750 exim_fail("exim: string expected after -X\n");
3753 /* -z: a line of text to log */
3758 log_oneline = string_copy_taint(
3759 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3762 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3765 /* All other initial characters are errors */
3770 } /* End of high-level switch statement */
3772 /* Failed to recognize the option, or syntax error */
3775 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3776 "option %s\n", arg);
3780 /* If -R or -S have been specified without -q, assume a single queue run. */
3782 if ( (deliver_selectstring || deliver_selectstring_sender)
3783 && queue_interval < 0)
3788 store_pool = old_pool;
3791 /* If usage_wanted is set we call the usage function - which never returns */
3792 if (usage_wanted) exim_usage(called_as);
3794 /* Arguments have been processed. Check for incompatibilities. */
3795 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3796 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3797 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3798 || filter_test != FTEST_NONE
3799 || msg_action_arg > 0 && !one_msg_action
3801 || ( msg_action_arg > 0
3802 && ( f.daemon_listen || queue_interval > 0 || list_options
3803 || checking && msg_action != MSG_LOAD
3804 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3806 || ( (f.daemon_listen || queue_interval > 0)
3807 && ( sender_address || list_options || list_queue || checking
3810 || f.daemon_listen && queue_interval == 0
3811 || f.inetd_wait_mode && queue_interval >= 0
3813 && ( checking || smtp_input || extract_recipients
3814 || filter_test != FTEST_NONE || bi_option
3816 || ( verify_address_mode
3817 && ( f.address_test_mode || smtp_input || extract_recipients
3818 || filter_test != FTEST_NONE || bi_option
3820 || ( f.address_test_mode
3821 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3825 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3827 || deliver_selectstring && queue_interval < 0
3828 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3830 exim_fail("exim: incompatible command-line options or arguments\n");
3832 /* If debugging is set up, set the file and the file descriptor to pass on to
3833 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3834 to run in the foreground. */
3836 if (debug_selector != 0)
3838 debug_file = stderr;
3839 debug_fd = fileno(debug_file);
3840 f.background_daemon = FALSE;
3841 testharness_pause_ms(100); /* lets caller finish */
3842 if (debug_selector != D_v) /* -v only doesn't show this */
3844 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3845 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3847 if (!version_printed)
3848 show_whats_supported(FALSE);
3852 /* When started with root privilege, ensure that the limits on the number of
3853 open files and the number of processes (where that is accessible) are
3854 sufficiently large, or are unset, in case Exim has been called from an
3855 environment where the limits are screwed down. Not all OS have the ability to
3856 change some of these limits. */
3860 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3866 #ifdef RLIMIT_NOFILE
3867 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3869 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3871 rlp.rlim_cur = rlp.rlim_max = 0;
3874 /* I originally chose 1000 as a nice big number that was unlikely to
3875 be exceeded. It turns out that some older OS have a fixed upper limit of
3878 if (rlp.rlim_cur < 1000)
3880 rlp.rlim_cur = rlp.rlim_max = 1000;
3881 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3883 rlp.rlim_cur = rlp.rlim_max = 256;
3884 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3885 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3892 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3894 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3896 rlp.rlim_cur = rlp.rlim_max = 0;
3899 # ifdef RLIM_INFINITY
3900 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3902 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3904 if (rlp.rlim_cur < 1000)
3906 rlp.rlim_cur = rlp.rlim_max = 1000;
3908 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3909 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3915 /* Exim is normally entered as root (but some special configurations are
3916 possible that don't do this). However, it always spins off sub-processes that
3917 set their uid and gid as required for local delivery. We don't want to pass on
3918 any extra groups that root may belong to, so we want to get rid of them all at
3921 We need to obey setgroups() at this stage, before possibly giving up root
3922 privilege for a changed configuration file, but later on we might need to
3923 check on the additional groups for the admin user privilege - can't do that
3924 till after reading the config, which might specify the exim gid. Therefore,
3925 save the group list here first. */
3927 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3928 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3930 /* There is a fundamental difference in some BSD systems in the matter of
3931 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3932 known not to be different. On the "different" systems there is a single group
3933 list, and the first entry in it is the current group. On all other versions of
3934 Unix there is a supplementary group list, which is in *addition* to the current
3935 group. Consequently, to get rid of all extraneous groups on a "standard" system
3936 you pass over 0 groups to setgroups(), while on a "different" system you pass
3937 over a single group - the current group, which is always the first group in the
3938 list. Calling setgroups() with zero groups on a "different" system results in
3939 an error return. The following code should cope with both types of system.
3941 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3942 the "setgroups() with zero groups" - and changes the egid.
3943 Thanks to that we had to stash the original_egid above, for use below
3944 in the call to exim_setugid().
3946 However, if this process isn't running as root, setgroups() can't be used
3947 since you have to be root to run it, even if throwing away groups.
3948 Except, sigh, for Hurd - where you can.
3949 Not being root here happens only in some unusual configurations. */
3952 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3953 && setgroups(0, NULL) != 0
3955 && setgroups(1, group_list) != 0)
3956 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3958 /* If the configuration file name has been altered by an argument on the
3959 command line (either a new file name or a macro definition) and the caller is
3960 not root, or if this is a filter testing run, remove any setuid privilege the
3961 program has and run as the underlying user.
3963 The exim user is locked out of this, which severely restricts the use of -C
3966 Otherwise, set the real ids to the effective values (should be root unless run
3967 from inetd, which it can either be root or the exim uid, if one is configured).
3969 There is a private mechanism for bypassing some of this, in order to make it
3970 possible to test lots of configurations automatically, without having either to
3971 recompile each time, or to patch in an actual configuration file name and other
3972 values (such as the path name). If running in the test harness, pretend that
3973 configuration file changes and macro definitions haven't happened. */
3976 (!f.trusted_config || /* Config changed, or */
3977 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3978 real_uid != root_uid && /* Not root, and */
3979 !f.running_in_test_harness /* Not fudged */
3981 expansion_test /* expansion testing */
3983 filter_test != FTEST_NONE) /* Filter testing */
3985 setgroups(group_count, group_list);
3986 exim_setugid(real_uid, real_gid, FALSE,
3987 US"-C, -D, -be or -bf forces real uid");
3988 removed_privilege = TRUE;
3990 /* In the normal case when Exim is called like this, stderr is available
3991 and should be used for any logging information because attempts to write
3992 to the log will usually fail. To arrange this, we unset really_exim. However,
3993 if no stderr is available there is no point - we might as well have a go
3994 at the log (if it fails, syslog will be written).
3996 Note that if the invoker is Exim, the logs remain available. Messing with
3997 this causes unlogged successful deliveries. */
3999 if (log_stderr && real_uid != exim_uid)
4000 f.really_exim = FALSE;
4003 /* Privilege is to be retained for the moment. It may be dropped later,
4004 depending on the job that this Exim process has been asked to do. For now, set
4005 the real uid to the effective so that subsequent re-execs of Exim are done by a
4009 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4011 /* If testing a filter, open the file(s) now, before wasting time doing other
4012 setups and reading the message. */
4014 if (filter_test & FTEST_SYSTEM)
4015 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4016 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4019 if (filter_test & FTEST_USER)
4020 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4021 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4024 /* Initialise lookup_list
4025 If debugging, already called above via version reporting.
4026 In either case, we initialise the list of available lookups while running
4027 as root. All dynamically modules are loaded from a directory which is
4028 hard-coded into the binary and is code which, if not a module, would be
4029 part of Exim already. Ability to modify the content of the directory
4030 is equivalent to the ability to modify a setuid binary!
4032 This needs to happen before we read the main configuration. */
4035 /*XXX this excrescence could move to the testsuite standard config setup file */
4037 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4040 /* Read the main runtime configuration data; this gives up if there
4041 is a failure. It leaves the configuration file open so that the subsequent
4042 configuration data for delivery can be read if needed.
4044 NOTE: immediately after opening the configuration file we change the working
4045 directory to "/"! Later we change to $spool_directory. We do it there, because
4046 during readconf_main() some expansion takes place already. */
4048 /* Store the initial cwd before we change directories. Can be NULL if the
4049 dir has already been unlinked. */
4050 initial_cwd = os_getcwd(NULL, 0);
4051 if (!initial_cwd && errno)
4052 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4054 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4055 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4058 -be[m] expansion test -
4059 -b[fF] filter test new
4061 -bmalware malware_test_file new
4063 -brw rewrite test new
4065 -bv[s] address verify -
4067 -bP <option> (except -bP config, which sets list_config)
4069 If any of these options is set, we suppress warnings about configuration
4070 issues (currently about tls_advertise_hosts and keep_environment not being
4074 int old_pool = store_pool;
4075 #ifdef MEASURE_TIMING
4077 (void)gettimeofday(&t0, NULL);
4080 store_pool = POOL_CONFIG;
4081 readconf_main(checking || list_options);
4082 store_pool = old_pool;
4084 #ifdef MEASURE_TIMING
4085 report_time_since(&t0, US"readconf_main (delta)");
4089 /* Now in directory "/" */
4091 if (cleanup_environment() == FALSE)
4092 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4095 /* If an action on specific messages is requested, or if a daemon or queue
4096 runner is being started, we need to know if Exim was called by an admin user.
4097 This is the case if the real user is root or exim, or if the real group is
4098 exim, or if one of the supplementary groups is exim or a group listed in
4099 admin_groups. We don't fail all message actions immediately if not admin_user,
4100 since some actions can be performed by non-admin users. Instead, set admin_user
4101 for later interrogation. */
4103 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4104 f.admin_user = TRUE;
4106 for (int i = 0; i < group_count && !f.admin_user; i++)
4107 if (group_list[i] == exim_gid)
4108 f.admin_user = TRUE;
4109 else if (admin_groups)
4110 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4111 if (admin_groups[j] == group_list[i])
4112 f.admin_user = TRUE;
4114 /* Another group of privileged users are the trusted users. These are root,
4115 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4116 are permitted to specify sender_addresses with -f on the command line, and
4117 other message parameters as well. */
4119 if (real_uid == root_uid || real_uid == exim_uid)
4120 f.trusted_caller = TRUE;
4124 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4125 if (trusted_users[i] == real_uid)
4126 f.trusted_caller = TRUE;
4129 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4130 if (trusted_groups[i] == real_gid)
4131 f.trusted_caller = TRUE;
4132 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4133 if (trusted_groups[i] == group_list[j])
4134 f.trusted_caller = TRUE;
4137 /* At this point, we know if the user is privileged and some command-line
4138 options become possibly impermissible, depending upon the configuration file. */
4140 if (checking && commandline_checks_require_admin && !f.admin_user)
4141 exim_fail("exim: those command-line flags are set to require admin\n");
4143 /* Handle the decoding of logging options. */
4145 decode_bits(log_selector, log_selector_size, log_notall,
4146 log_selector_string, log_options, log_options_count, US"log", 0);
4150 debug_printf("configuration file is %s\n", config_main_filename);
4151 debug_printf("log selectors =");
4152 for (int i = 0; i < log_selector_size; i++)
4153 debug_printf(" %08x", log_selector[i]);
4157 /* If domain literals are not allowed, check the sender address that was
4158 supplied with -f. Ditto for a stripped trailing dot. */
4162 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4163 exim_fail("exim: bad -f address \"%s\": domain literals not "
4164 "allowed\n", sender_address);
4165 if (f_end_dot && !strip_trailing_dot)
4166 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4167 "(trailing dot not allowed)\n", sender_address);
4170 /* See if an admin user overrode our logging. */
4172 if (cmdline_syslog_name)
4175 syslog_processname = cmdline_syslog_name;
4176 log_file_path = string_copy(CUS"syslog");
4179 /* not a panic, non-privileged users should not be able to spam paniclog */
4181 "exim: you lack sufficient privilege to specify syslog process name\n");
4183 /* Paranoia check of maximum lengths of certain strings. There is a check
4184 on the length of the log file path in log.c, which will come into effect
4185 if there are any calls to write the log earlier than this. However, if we
4186 get this far but the string is very long, it is better to stop now than to
4187 carry on and (e.g.) receive a message and then have to collapse. The call to
4188 log_write() from here will cause the ultimate panic collapse if the complete
4189 file name exceeds the buffer length. */
4191 if (Ustrlen(log_file_path) > 200)
4192 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4193 "log_file_path is longer than 200 chars: aborting");
4195 if (Ustrlen(pid_file_path) > 200)
4196 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4197 "pid_file_path is longer than 200 chars: aborting");
4199 if (Ustrlen(spool_directory) > 200)
4200 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4201 "spool_directory is longer than 200 chars: aborting");
4203 /* Length check on the process name given to syslog for its TAG field,
4204 which is only permitted to be 32 characters or less. See RFC 3164. */
4206 if (Ustrlen(syslog_processname) > 32)
4207 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4208 "syslog_processname is longer than 32 chars: aborting");
4213 log_write(0, LOG_MAIN, "%s", log_oneline);
4214 return EXIT_SUCCESS;
4217 return EXIT_FAILURE;
4219 /* In some operating systems, the environment variable TMPDIR controls where
4220 temporary files are created; Exim doesn't use these (apart from when delivering
4221 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4222 If TMPDIR is found in the environment, reset it to the value defined in the
4223 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4224 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4225 EXIM_TMPDIR by the build scripts.
4229 if (environ) for (uschar ** p = USS environ; *p; p++)
4230 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4232 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4233 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4235 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4239 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4240 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4241 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4242 called by a user who has set the TZ variable. This then affects the timestamps
4243 in log files and in Received: headers, and any created Date: header lines. The
4244 required timezone is settable in the configuration file, so nothing can be done
4245 about this earlier - but hopefully nothing will normally be logged earlier than
4246 this. We have to make a new environment if TZ is wrong, but don't bother if
4247 timestamps_utc is set, because then all times are in UTC anyway. */
4249 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4250 f.timestamps_utc = TRUE;
4253 uschar *envtz = US getenv("TZ");
4255 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4256 : timezone_string != NULL
4259 uschar **p = USS environ;
4263 if (environ) while (*p++) count++;
4264 if (!envtz) count++;
4265 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4266 if (environ) for (p = USS environ; *p; p++)
4267 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4268 if (timezone_string)
4270 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4271 sprintf(CS *newp++, "TZ=%s", timezone_string);
4276 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4277 tod_stamp(tod_log));
4281 /* Handle the case when we have removed the setuid privilege because of -C or
4282 -D. This means that the caller of Exim was not root.
4284 There is a problem if we were running as the Exim user. The sysadmin may
4285 expect this case to retain privilege because "the binary was called by the
4286 Exim user", but it hasn't, because either the -D option set macros, or the
4287 -C option set a non-trusted configuration file. There are two possibilities:
4289 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4290 to do message deliveries. Thus, the fact that it is running as a
4291 non-privileged user is plausible, and might be wanted in some special
4292 configurations. However, really_exim will have been set false when
4293 privilege was dropped, to stop Exim trying to write to its normal log
4294 files. Therefore, re-enable normal log processing, assuming the sysadmin
4295 has set up the log directory correctly.
4297 (2) If deliver_drop_privilege is not set, the configuration won't work as
4298 apparently intended, and so we log a panic message. In order to retain
4299 root for -C or -D, the caller must either be root or be invoking a
4300 trusted configuration file (when deliver_drop_privilege is false). */
4302 if ( removed_privilege
4303 && (!f.trusted_config || opt_D_used)
4304 && real_uid == exim_uid)
4305 if (deliver_drop_privilege)
4306 f.really_exim = TRUE; /* let logging work normally */
4308 log_write(0, LOG_MAIN|LOG_PANIC,
4309 "exim user lost privilege for using %s option",
4310 f.trusted_config? "-D" : "-C");
4312 /* Start up Perl interpreter if Perl support is configured and there is a
4313 perl_startup option, and the configuration or the command line specifies
4314 initializing starting. Note that the global variables are actually called
4315 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4318 if (perl_start_option != 0)
4319 opt_perl_at_start = (perl_start_option > 0);
4320 if (opt_perl_at_start && opt_perl_startup != NULL)
4323 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4324 if ((errstr = init_perl(opt_perl_startup)))
4325 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4326 opt_perl_started = TRUE;
4328 #endif /* EXIM_PERL */
4330 /* Log the arguments of the call if the configuration file said so. This is
4331 a debugging feature for finding out what arguments certain MUAs actually use.
4332 Don't attempt it if logging is disabled, or if listing variables or if
4333 verifying/testing addresses or expansions. */
4335 if ( (debug_selector & D_any || LOGGING(arguments))
4336 && f.really_exim && !list_options && !checking)
4338 uschar *p = big_buffer;
4339 Ustrcpy(p, US"cwd= (failed)");
4346 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4347 p += Ustrlen(CCS p);
4350 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4352 for (int i = 0; i < argc; i++)
4354 int len = Ustrlen(argv[i]);
4355 const uschar *printing;
4357 if (p + len + 8 >= big_buffer + big_buffer_size)
4359 Ustrcpy(p, US" ...");
4360 log_write(0, LOG_MAIN, "%s", big_buffer);
4361 Ustrcpy(big_buffer, US"...");
4364 printing = string_printing(argv[i]);
4365 if (!*printing) quote = US"\"";
4368 const uschar *pp = printing;
4370 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4372 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4373 (p - big_buffer) - 4), printing, quote);
4376 if (LOGGING(arguments))
4377 log_write(0, LOG_MAIN, "%s", big_buffer);
4379 debug_printf("%s\n", big_buffer);
4382 /* Set the working directory to be the top-level spool directory. We don't rely
4383 on this in the code, which always uses fully qualified names, but it's useful
4384 for core dumps etc. Don't complain if it fails - the spool directory might not
4385 be generally accessible and calls with the -C option (and others) have lost
4386 privilege by now. Before the chdir, we try to ensure that the directory exists.
4389 if (Uchdir(spool_directory) != 0)
4391 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4392 (void) Uchdir(spool_directory);
4395 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4396 alias file. Exim doesn't have such a concept, but this call is screwed into
4397 Sun's YP makefiles. Handle this by calling a configured script, as the real
4398 user who called Exim. The -oA option can be used to pass an argument to the
4403 (void) fclose(config_file);
4404 if (bi_command && *bi_command)
4408 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4409 if (alias_arg) argv[i++] = alias_arg;
4412 setgroups(group_count, group_list);
4413 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4415 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4416 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4418 execv(CS argv[0], (char *const *)argv);
4419 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4423 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4428 /* We moved the admin/trusted check to be immediately after reading the
4429 configuration file. We leave these prints here to ensure that syslog setup,
4430 logfile setup, and so on has already happened. */
4432 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4433 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4435 /* Only an admin user may start the daemon or force a queue run in the default
4436 configuration, but the queue run restriction can be relaxed. Only an admin
4437 user may request that a message be returned to its sender forthwith. Only an
4438 admin user may specify a debug level greater than D_v (because it might show
4439 passwords, etc. in lookup queries). Only an admin user may request a queue
4440 count. Only an admin user can use the test interface to scan for email
4441 (because Exim will be in the spool dir and able to look at mails). */
4445 BOOL debugset = (debug_selector & ~D_v) != 0;
4446 if ( deliver_give_up || f.daemon_listen || malware_test_file
4447 || count_queue && queue_list_requires_admin
4448 || list_queue && queue_list_requires_admin
4449 || queue_interval >= 0 && prod_requires_admin
4450 || queue_name_dest && prod_requires_admin
4451 || debugset && !f.running_in_test_harness
4453 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4456 /* If the real user is not root or the exim uid, the argument for passing
4457 in an open TCP/IP connection for another message is not permitted, nor is
4458 running with the -N option for any delivery action, unless this call to exim is
4459 one that supplied an input message, or we are using a patched exim for
4460 regression testing. */
4462 if ( real_uid != root_uid && real_uid != exim_uid
4463 && ( continue_hostname
4465 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4467 && !f.running_in_test_harness
4469 exim_fail("exim: Permission denied\n");
4471 /* If the caller is not trusted, certain arguments are ignored when running for
4472 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4473 Note that authority for performing certain actions on messages is tested in the
4474 queue_action() function. */
4476 if (!f.trusted_caller && !checking)
4478 sender_host_name = sender_host_address = interface_address =
4479 sender_ident = received_protocol = NULL;
4480 sender_host_port = interface_port = 0;
4481 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4484 /* If a sender host address is set, extract the optional port number off the
4485 end of it and check its syntax. Do the same thing for the interface address.
4486 Exim exits if the syntax is bad. */
4490 if (sender_host_address)
4491 sender_host_port = check_port(sender_host_address);
4492 if (interface_address)
4493 interface_port = check_port(interface_address);
4496 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4499 if (f.trusted_caller)
4501 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4502 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4505 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4508 /* If an SMTP message is being received check to see if the standard input is a
4509 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4510 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4515 union sockaddr_46 inetd_sock;
4516 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4517 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4519 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4520 if (family == AF_INET || family == AF_INET6)
4522 union sockaddr_46 interface_sock;
4523 size = sizeof(interface_sock);
4525 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4526 interface_address = host_ntoa(-1, &interface_sock, NULL,
4529 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4531 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4534 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4535 NULL, &sender_host_port);
4536 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4537 "inetd is not supported when mua_wrapper is set");
4541 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4546 /* If the load average is going to be needed while receiving a message, get it
4547 now for those OS that require the first call to os_getloadavg() to be done as
4548 root. There will be further calls later for each message received. */
4550 #ifdef LOAD_AVG_NEEDS_ROOT
4551 if ( receiving_message
4552 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4553 load_average = OS_GETLOADAVG();
4556 /* The queue_only configuration option can be overridden by -odx on the command
4557 line, except that if queue_only_override is false, queue_only cannot be unset
4558 from the command line. */
4560 if (queue_only_set && (queue_only_override || arg_queue_only))
4561 queue_only = arg_queue_only;
4563 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4566 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4567 if (arg_smtp_receive_timeout >= 0)
4568 smtp_receive_timeout = arg_smtp_receive_timeout;
4570 /* If Exim was started with root privilege, unless we have already removed the
4571 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4572 except when starting the daemon or doing some kind of delivery or address
4573 testing (-bt). These are the only cases when root need to be retained. We run
4574 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4575 retained only for starting the daemon. We always do the initgroups() in this
4576 situation (controlled by the TRUE below), in order to be as close as possible
4577 to the state Exim usually runs in. */
4579 if ( !unprivileged /* originally had root AND */
4580 && !removed_privilege /* still got root AND */
4581 && !f.daemon_listen /* not starting the daemon */
4582 && queue_interval <= 0 /* (either kind of daemon) */
4583 && ( /* AND EITHER */
4584 deliver_drop_privilege /* requested unprivileged */
4586 queue_interval < 0 /* not running the queue */
4587 && ( msg_action_arg < 0 /* and */
4588 || msg_action != MSG_DELIVER /* not delivering */
4590 && (!checking || !f.address_test_mode) /* not address checking */
4591 && !rcpt_verify_quota /* and not quota checking */
4593 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4595 /* When we are retaining a privileged uid, we still change to the exim gid. */
4600 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4601 rv = setgid(exim_gid);
4602 /* Impact of failure is that some stuff might end up with an incorrect group.
4603 We track this for failures from root, since any attempt to change privilege
4604 by root should succeed and failures should be examined. For non-root,
4605 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4606 no need to complain then. */
4608 if (!(unprivileged || removed_privilege))
4609 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4612 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4613 (long int)exim_gid, strerror(errno));
4617 /* Handle a request to scan a file for malware */
4618 if (malware_test_file)
4620 #ifdef WITH_CONTENT_SCAN
4622 set_process_info("scanning file for malware");
4623 if ((result = malware_in_file(malware_test_file)) == FAIL)
4625 printf("No malware found.\n");
4630 printf("Malware lookup returned non-okay/fail: %d\n", result);
4634 printf("Malware found: %s\n", malware_name);
4636 printf("Malware scan detected malware of unknown name.\n");
4638 printf("Malware scanning not enabled at compile time.\n");
4643 /* Handle a request to list the delivery queue */
4647 set_process_info("listing the queue");
4648 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4652 /* Handle a request to count the delivery queue */
4656 set_process_info("counting the queue");
4657 fprintf(stdout, "%u\n", queue_count());
4661 /* Handle actions on specific messages, except for the force delivery and
4662 message load actions, which are done below. Some actions take a whole list of
4663 message ids, which are known to continue up to the end of the arguments. Others
4664 take a single message id and then operate on the recipients list. */
4666 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4668 int yield = EXIT_SUCCESS;
4669 set_process_info("acting on specified messages");
4671 /* ACL definitions may be needed when removing a message (-Mrm) because
4672 event_action gets expanded */
4674 if (msg_action == MSG_REMOVE)
4676 int old_pool = store_pool;
4677 store_pool = POOL_CONFIG;
4679 store_pool = old_pool;
4680 store_writeprotect(POOL_CONFIG);
4683 if (!one_msg_action)
4685 for (i = msg_action_arg; i < argc; i++)
4686 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4687 yield = EXIT_FAILURE;
4690 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4691 default: printf("\n"); break;
4695 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4696 recipients_arg)) yield = EXIT_FAILURE;
4700 /* We used to set up here to skip reading the ACL section, on
4701 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4702 Now, since the intro of the ${acl } expansion, ACL definitions may be
4703 needed in transports so we lost the optimisation. */
4706 int old_pool = store_pool;
4707 #ifdef MEASURE_TIMING
4709 (void)gettimeofday(&t0, NULL);
4712 store_pool = POOL_CONFIG;
4714 store_pool = old_pool;
4716 /* -be can add macro definitions, needing to link to the macro structure
4717 chain. Otherwise, make the memory used for config data readonly. */
4719 if (!expansion_test)
4720 store_writeprotect(POOL_CONFIG);
4722 #ifdef MEASURE_TIMING
4723 report_time_since(&t0, US"readconf_rest (delta)");
4727 /* Handle a request to check quota */
4728 if (rcpt_verify_quota)
4729 if (real_uid != root_uid && real_uid != exim_uid)
4730 exim_fail("exim: Permission denied\n");
4731 else if (recipients_arg >= argc)
4732 exim_fail("exim: missing recipient for quota check\n");
4735 verify_quota(argv[recipients_arg]);
4736 exim_exit(EXIT_SUCCESS);
4739 /* Handle the -brt option. This is for checking out retry configurations.
4740 The next three arguments are a domain name or a complete address, and
4741 optionally two error numbers. All it does is to call the function that
4742 scans the retry configuration data. */
4744 if (test_retry_arg >= 0)
4746 retry_config *yield;
4747 int basic_errno = 0;
4749 const uschar *s1, *s2;
4751 if (test_retry_arg >= argc)
4753 printf("-brt needs a domain or address argument\n");
4754 exim_exit(EXIT_FAILURE);
4756 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4759 /* If the first argument contains no @ and no . it might be a local user
4760 or it might be a single-component name. Treat as a domain. */
4762 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4764 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4765 "being \ntreated as a one-component domain, not as a local part.\n\n",
4769 /* There may be an optional second domain arg. */
4771 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4772 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4774 /* The final arg is an error name */
4776 if (test_retry_arg < argc)
4778 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4780 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4783 printf("%s\n", CS error);
4784 return EXIT_FAILURE;
4787 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4788 code > 100 as an error is for matching codes to the decade. Turn them into
4789 a real error code, off the decade. */
4791 if (basic_errno == ERRNO_MAIL4XX ||
4792 basic_errno == ERRNO_RCPT4XX ||
4793 basic_errno == ERRNO_DATA4XX)
4795 int code = (more_errno >> 8) & 255;
4797 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4798 else if (code > 100)
4799 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4803 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4804 printf("No retry information found\n");
4807 more_errno = yield->more_errno;
4808 printf("Retry rule: %s ", yield->pattern);
4810 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4812 printf("quota%s%s ",
4813 (more_errno > 0)? "_" : "",
4814 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4816 else if (yield->basic_errno == ECONNREFUSED)
4818 printf("refused%s%s ",
4819 (more_errno > 0)? "_" : "",
4820 (more_errno == 'M')? "MX" :
4821 (more_errno == 'A')? "A" : "");
4823 else if (yield->basic_errno == ETIMEDOUT)
4826 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4828 if (more_errno != 0) printf("_%s",
4829 (more_errno == 'M')? "MX" : "A");
4832 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4833 printf("auth_failed ");
4836 for (retry_rule * r = yield->rules; r; r = r->next)
4838 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4839 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4845 printf(",%d.", x/1000);
4859 exim_exit(EXIT_SUCCESS);
4862 /* Handle a request to list one or more configuration options */
4863 /* If -n was set, we suppress some information */
4868 set_process_info("listing variables");
4869 if (recipients_arg >= argc)
4870 fail = !readconf_print(US"all", NULL, flag_n);
4871 else for (i = recipients_arg; i < argc; i++)
4874 (Ustrcmp(argv[i], "router") == 0 ||
4875 Ustrcmp(argv[i], "transport") == 0 ||
4876 Ustrcmp(argv[i], "authenticator") == 0 ||
4877 Ustrcmp(argv[i], "macro") == 0 ||
4878 Ustrcmp(argv[i], "environment") == 0))
4880 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4884 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4886 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4891 set_process_info("listing config");
4892 exim_exit(readconf_print(US"config", NULL, flag_n)
4893 ? EXIT_SUCCESS : EXIT_FAILURE);
4897 /* Initialise subsystems as required. */
4901 /* Handle a request to deliver one or more messages that are already on the
4902 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4903 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4905 Delivery of specific messages is typically used for a small number when
4906 prodding by hand (when the option forced_delivery will be set) or when
4907 re-execing to regain root privilege. Each message delivery must happen in a
4908 separate process, so we fork a process for each one, and run them sequentially
4909 so that debugging output doesn't get intertwined, and to avoid spawning too
4910 many processes if a long list is given. However, don't fork for the last one;
4911 this saves a process in the common case when Exim is called to deliver just one
4914 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4916 if (prod_requires_admin && !f.admin_user)
4918 fprintf(stderr, "exim: Permission denied\n");
4919 exim_exit(EXIT_FAILURE);
4921 set_process_info("delivering specified messages");
4922 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4923 for (i = msg_action_arg; i < argc; i++)
4927 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4928 that runs into a later copy into the untainted global message_id[] */
4929 /*XXX Do we need a length limit check here? */
4931 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4932 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4934 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4935 exim_underbar_exit(EXIT_SUCCESS);
4939 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4941 exim_exit(EXIT_FAILURE);
4945 exim_exit(EXIT_SUCCESS);
4949 /* If only a single queue run is requested, without SMTP listening, we can just
4950 turn into a queue runner, with an optional starting message id. */
4952 if (queue_interval == 0 && !f.daemon_listen)
4954 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4955 start_queue_run_id ? US" starting at " : US"",
4956 start_queue_run_id ? start_queue_run_id: US"",
4957 stop_queue_run_id ? US" stopping at " : US"",
4958 stop_queue_run_id ? stop_queue_run_id : US"");
4960 set_process_info("running the '%s' queue (single queue run)", queue_name);
4962 set_process_info("running the queue (single queue run)");
4963 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4964 exim_exit(EXIT_SUCCESS);
4968 /* Find the login name of the real user running this process. This is always
4969 needed when receiving a message, because it is written into the spool file. It
4970 may also be used to construct a from: or a sender: header, and in this case we
4971 need the user's full name as well, so save a copy of it, checked for RFC822
4972 syntax and munged if necessary, if it hasn't previously been set by the -F
4973 argument. We may try to get the passwd entry more than once, in case NIS or
4974 other delays are in evidence. Save the home directory for use in filter testing
4979 if ((pw = getpwuid(real_uid)) != NULL)
4981 originator_login = string_copy(US pw->pw_name);
4982 originator_home = string_copy(US pw->pw_dir);
4984 /* If user name has not been set by -F, set it from the passwd entry
4985 unless -f has been used to set the sender address by a trusted user. */
4987 if (!originator_name)
4989 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4991 uschar *name = US pw->pw_gecos;
4992 uschar *amp = Ustrchr(name, '&');
4995 /* Most Unix specify that a '&' character in the gecos field is
4996 replaced by a copy of the login name, and some even specify that
4997 the first character should be upper cased, so that's what we do. */
5002 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5003 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5004 buffer[loffset] = toupper(buffer[loffset]);
5008 /* If a pattern for matching the gecos field was supplied, apply
5009 it and then expand the name string. */
5011 if (gecos_pattern && gecos_name)
5013 const pcre2_code *re;
5014 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5016 if (regex_match_and_setup(re, name, 0, -1))
5018 uschar *new_name = expand_string(gecos_name);
5022 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5023 "gecos field \"%s\"\n", new_name, name);
5026 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5027 "\"%s\": %s\n", gecos_name, expand_string_message);
5029 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5030 "gecos field \"%s\"\n", gecos_pattern, name);
5031 store_free((void *)re);
5033 originator_name = string_copy(name);
5036 /* A trusted caller has used -f but not -F */
5038 else originator_name = US"";
5041 /* Break the retry loop */
5046 if (++i > finduser_retries) break;
5050 /* If we cannot get a user login, log the incident and give up, unless the
5051 configuration specifies something to use. When running in the test harness,
5052 any setting of unknown_login overrides the actual name. */
5054 if (!originator_login || f.running_in_test_harness)
5058 originator_login = expand_string(unknown_login);
5059 if (!originator_name && unknown_username)
5060 originator_name = expand_string(unknown_username);
5061 if (!originator_name) originator_name = US"";
5063 if (!originator_login)
5064 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5068 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5071 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5073 /* If a message is created by this call of Exim, the uid/gid of its originator
5074 are those of the caller. These values are overridden if an existing message is
5075 read in from the spool. */
5077 originator_uid = real_uid;
5078 originator_gid = real_gid;
5080 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5081 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5083 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5084 returns. We leave this till here so that the originator_ fields are available
5085 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5088 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5092 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5093 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5094 "mua_wrapper is set");
5097 # ifndef DISABLE_TLS
5098 /* This also checks that the library linkage is working and we can call
5099 routines in it, so call even if tls_require_ciphers is unset */
5101 # ifdef MEASURE_TIMING
5103 (void)gettimeofday(&t0, NULL);
5105 if (!tls_dropprivs_validate_require_cipher(FALSE))
5107 # ifdef MEASURE_TIMING
5108 report_time_since(&t0, US"validate_ciphers (delta)");
5116 /* If the sender ident has not been set (by a trusted caller) set it to
5117 the caller. This will get overwritten below for an inetd call. If a trusted
5118 caller has set it empty, unset it. */
5120 if (!sender_ident) sender_ident = originator_login;
5121 else if (!*sender_ident) sender_ident = NULL;
5123 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5124 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5125 originator_* variables set. */
5127 if (test_rewrite_arg >= 0)
5129 f.really_exim = FALSE;
5130 if (test_rewrite_arg >= argc)
5132 printf("-brw needs an address argument\n");
5133 exim_exit(EXIT_FAILURE);
5135 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5136 exim_exit(EXIT_SUCCESS);
5139 /* A locally-supplied message is considered to be coming from a local user
5140 unless a trusted caller supplies a sender address with -f, or is passing in the
5141 message via SMTP (inetd invocation or otherwise). */
5143 if ( !sender_address && !smtp_input
5144 || !f.trusted_caller && filter_test == FTEST_NONE)
5146 f.sender_local = TRUE;
5148 /* A trusted caller can supply authenticated_sender and authenticated_id
5149 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5150 defaults except when host checking. */
5152 if (!authenticated_sender && !host_checking)
5153 authenticated_sender = string_sprintf("%s@%s", originator_login,
5154 qualify_domain_sender);
5155 if (!authenticated_id && !host_checking)
5156 authenticated_id = originator_login;
5159 /* Trusted callers are always permitted to specify the sender address.
5160 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5161 is specified is the empty address. However, if a trusted caller does not
5162 specify a sender address for SMTP input, we leave sender_address unset. This
5163 causes the MAIL commands to be honoured. */
5165 if ( !smtp_input && !sender_address
5166 || !receive_check_set_sender(sender_address))
5168 /* Either the caller is not permitted to set a general sender, or this is
5169 non-SMTP input and the trusted caller has not set a sender. If there is no
5170 sender, or if a sender other than <> is set, override with the originator's
5171 login (which will get qualified below), except when checking things. */
5173 if ( !sender_address /* No sender_address set */
5175 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5176 !checking)) /* Not running tests, including filter tests */
5178 sender_address = originator_login;
5179 f.sender_address_forced = FALSE;
5180 sender_address_domain = 0;
5184 /* Remember whether an untrusted caller set the sender address */
5186 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5188 /* Ensure that the sender address is fully qualified unless it is the empty
5189 address, which indicates an error message, or doesn't exist (root caller, smtp
5190 interface, no -f argument). */
5192 if (sender_address && *sender_address && sender_address_domain == 0)
5193 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5194 qualify_domain_sender);
5196 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5198 /* Handle a request to verify a list of addresses, or test them for delivery.
5199 This must follow the setting of the sender address, since routers can be
5200 predicated upon the sender. If no arguments are given, read addresses from
5201 stdin. Set debug_level to at least D_v to get full output for address testing.
5204 if (verify_address_mode || f.address_test_mode)
5207 int flags = vopt_qualify;
5209 if (verify_address_mode)
5211 if (!verify_as_sender) flags |= vopt_is_recipient;
5212 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5217 flags |= vopt_is_recipient;
5218 debug_selector |= D_v;
5219 debug_file = stderr;
5220 debug_fd = fileno(debug_file);
5221 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5224 if (recipients_arg < argc)
5225 while (recipients_arg < argc)
5227 /* Supplied addresses are tainted since they come from a user */
5228 uschar * s = string_copy_taint(
5229 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5233 BOOL finished = FALSE;
5234 uschar *ss = parse_find_address_end(s, FALSE);
5235 if (*ss == ',') *ss = 0; else finished = TRUE;
5236 test_address(s, flags, &exit_value);
5239 while (*++s == ',' || isspace(*s)) ;
5245 uschar * s = get_stdinput(NULL, NULL);
5247 test_address(string_copy_taint(
5248 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5250 flags, &exit_value);
5254 exim_exit(exit_value);
5257 /* Handle expansion checking. Either expand items on the command line, or read
5258 from stdin if there aren't any. If -Mset was specified, load the message so
5259 that its variables can be used, but restrict this facility to admin users.
5260 Otherwise, if -bem was used, read a message from stdin. */
5264 dns_init(FALSE, FALSE, FALSE);
5265 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5269 exim_fail("exim: permission denied\n");
5270 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5271 /* Checking the length of the ID is sufficient to validate it.
5272 Get an untainted version so file opens can be done. */
5273 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5275 spoolname = string_sprintf("%s-H", message_id);
5276 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5277 printf ("Failed to load message datafile %s\n", message_id);
5278 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5279 printf ("Failed to load message %s\n", message_id);
5282 /* Read a test message from a file. We fudge it up to be on stdin, saving
5283 stdin itself for later reading of expansion strings. */
5285 else if (expansion_test_message)
5287 int save_stdin = dup(0);
5288 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5290 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5293 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5294 message_ended = END_NOTENDED;
5295 read_message_body(receive_msg(extract_recipients));
5296 message_linecount += body_linecount;
5297 (void)dup2(save_stdin, 0);
5298 (void)close(save_stdin);
5299 clearerr(stdin); /* Required by Darwin */
5302 /* Only admin users may see config-file macros this way */
5304 if (!f.admin_user) macros_user = macros = mlast = NULL;
5306 /* Allow $recipients for this testing */
5308 f.enable_dollar_recipients = TRUE;
5310 /* Expand command line items */
5312 if (recipients_arg < argc)
5313 while (recipients_arg < argc)
5314 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5320 char *(*fn_readline)(const char *) = NULL;
5321 void (*fn_addhist)(const char *) = NULL;
5325 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5328 while (s = get_stdinput(fn_readline, fn_addhist))
5329 expansion_test_line(s);
5332 if (dlhandle) dlclose(dlhandle);
5336 /* The data file will be open after -Mset */
5338 if (deliver_datafile >= 0)
5340 (void)close(deliver_datafile);
5341 deliver_datafile = -1;
5344 exim_exit(EXIT_SUCCESS);
5348 /* The active host name is normally the primary host name, but it can be varied
5349 for hosts that want to play several parts at once. We need to ensure that it is
5350 set for host checking, and for receiving messages. */
5352 smtp_active_hostname = primary_hostname;
5353 if (raw_active_hostname != NULL)
5355 uschar *nah = expand_string(raw_active_hostname);
5358 if (!f.expand_string_forcedfail)
5359 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5360 "(smtp_active_hostname): %s", raw_active_hostname,
5361 expand_string_message);
5363 else if (nah[0] != 0) smtp_active_hostname = nah;
5366 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5367 given IP address so that the blocking and relay configuration can be tested.
5368 Unless a sender_ident was set by -oMt, we discard it (the default is the
5369 caller's login name). An RFC 1413 call is made only if we are running in the
5370 test harness and an incoming interface and both ports are specified, because
5371 there is no TCP/IP call to find the ident for. */
5378 if (!sender_ident_set)
5380 sender_ident = NULL;
5381 if (f.running_in_test_harness && sender_host_port
5382 && interface_address && interface_port)
5383 verify_get_ident(1223); /* note hardwired port number */
5386 /* In case the given address is a non-canonical IPv6 address, canonicalize
5387 it. The code works for both IPv4 and IPv6, as it happens. */
5389 size = host_aton(sender_host_address, x);
5390 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5391 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5393 /* Now set up for testing */
5395 host_build_sender_fullhost();
5399 f.sender_local = FALSE;
5400 f.sender_host_notsocket = TRUE;
5401 debug_file = stderr;
5402 debug_fd = fileno(debug_file);
5403 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5404 "**** but without any ident (RFC 1413) callback.\n"
5405 "**** This is not for real!\n\n",
5406 sender_host_address);
5408 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5409 if (verify_check_host(&hosts_connection_nolog) == OK)
5411 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5412 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5414 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5416 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5417 because a log line has already been written for all its failure exists
5418 (usually "connection refused: <reason>") and writing another one is
5419 unnecessary clutter. */
5421 if (smtp_start_session())
5424 for (; (reset_point = store_mark()); store_reset(reset_point))
5426 if (smtp_setup_msg() <= 0) break;
5427 if (!receive_msg(FALSE)) break;
5429 return_path = sender_address = NULL;
5430 dnslist_domain = dnslist_matched = NULL;
5431 #ifndef DISABLE_DKIM
5432 dkim_cur_signer = NULL;
5435 deliver_localpart_orig = NULL;
5436 deliver_domain_orig = NULL;
5437 callout_address = sending_ip_address = NULL;
5438 deliver_localpart_data = deliver_domain_data =
5439 recipient_data = sender_data = NULL;
5440 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5444 exim_exit(EXIT_SUCCESS);
5448 /* Arrange for message reception if recipients or SMTP were specified;
5449 otherwise complain unless a version print (-bV) happened or this is a filter
5450 verification test or info dump.
5451 In the former case, show the configuration file name. */
5453 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5455 if (version_printed)
5457 if (Ustrchr(config_main_filelist, ':'))
5458 printf("Configuration file search path is %s\n", config_main_filelist);
5459 printf("Configuration file is %s\n", config_main_filename);
5460 return EXIT_SUCCESS;
5463 if (info_flag != CMDINFO_NONE)
5465 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5466 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5469 if (filter_test == FTEST_NONE)
5470 exim_usage(called_as);
5474 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5475 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5476 that we are not called from inetd, because that is rejected above. The
5477 following configuration settings are forced here:
5479 (1) Synchronous delivery (-odi)
5480 (2) Errors to stderr (-oep == -oeq)
5481 (3) No parallel remote delivery
5482 (4) Unprivileged delivery
5484 We don't force overall queueing options because there are several of them;
5485 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5486 to override any SMTP queueing. */
5490 f.synchronous_delivery = TRUE;
5491 arg_error_handling = ERRORS_STDERR;
5492 remote_max_parallel = 1;
5493 deliver_drop_privilege = TRUE;
5494 f.queue_smtp = FALSE;
5495 queue_smtp_domains = NULL;
5497 message_utf8_downconvert = -1; /* convert-if-needed */
5502 /* Prepare to accept one or more new messages on the standard input. When a
5503 message has been read, its id is returned in message_id[]. If doing immediate
5504 delivery, we fork a delivery process for each received message, except for the
5505 last one, where we can save a process switch.
5507 It is only in non-smtp mode that error_handling is allowed to be changed from
5508 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5509 sendmail error modes other than -oem ever actually used? Later: yes.) */
5511 if (!smtp_input) error_handling = arg_error_handling;
5513 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5514 logging being sent down the socket and make an identd call to get the
5517 else if (f.is_inetd)
5519 (void)fclose(stderr);
5520 exim_nullstd(); /* Re-open to /dev/null */
5521 verify_get_ident(IDENT_PORT);
5522 host_build_sender_fullhost();
5523 set_process_info("handling incoming connection from %s via inetd",
5527 /* If the sender host address has been set, build sender_fullhost if it hasn't
5528 already been done (which it will have been for inetd). This caters for the
5529 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5530 so that the test for IP options is skipped for -bs input. */
5532 if (sender_host_address && !sender_fullhost)
5534 host_build_sender_fullhost();
5535 set_process_info("handling incoming connection from %s via -oMa",
5537 f.sender_host_notsocket = TRUE;
5540 /* Otherwise, set the sender host as unknown except for inetd calls. This
5541 prevents host checking in the case of -bs not from inetd and also for -bS. */
5543 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5545 /* If stdout does not exist, then dup stdin to stdout. This can happen
5546 if exim is started from inetd. In this case fd 0 will be set to the socket,
5547 but fd 1 will not be set. This also happens for passed SMTP channels. */
5549 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5551 /* Set up the incoming protocol name and the state of the program. Root is
5552 allowed to force received protocol via the -oMr option above. If we have come
5553 via inetd, the process info has already been set up. We don't set
5554 received_protocol here for smtp input, as it varies according to
5555 batch/HELO/EHLO/AUTH/TLS. */
5559 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5560 smtp_batched_input? "batched " : "",
5561 sender_address ? sender_address : originator_login);
5565 int old_pool = store_pool;
5566 store_pool = POOL_PERM;
5567 if (!received_protocol)
5568 received_protocol = string_sprintf("local%s", called_as);
5569 store_pool = old_pool;
5570 set_process_info("accepting a local non-SMTP message from <%s>",
5574 /* Initialize the session_local_queue-only flag (this will be ignored if
5575 mua_wrapper is set) */
5578 session_local_queue_only = queue_only;
5580 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5581 the spool if so configured. On failure, we must not attempt to send an error
5582 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5583 error code is given.) */
5585 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5586 exim_fail("exim: insufficient disk space\n");
5588 /* If this is smtp input of any kind, real or batched, handle the start of the
5591 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5592 because a log line has already been written for all its failure exists
5593 (usually "connection refused: <reason>") and writing another one is
5594 unnecessary clutter. */
5600 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5601 if (verify_check_host(&hosts_connection_nolog) == OK)
5603 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5604 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5606 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5607 if (!smtp_start_session())
5610 exim_exit(EXIT_SUCCESS);
5614 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5615 (we handle buferring so as to have visibility of fill level). */
5619 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5620 if (expand_string_message)
5621 if (thismessage_size_limit == -1)
5622 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5623 "message_size_limit: %s", expand_string_message);
5625 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5626 "message_size_limit: %s", expand_string_message);
5628 setvbuf(stdin, NULL, _IONBF, 0);
5631 /* Loop for several messages when reading SMTP input. If we fork any child
5632 processes, we don't want to wait for them unless synchronous delivery is
5633 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5634 same as SIG_DFL, despite the fact that documentation often lists the default as
5635 "ignore". This is a confusing area. This is what I know:
5637 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5638 processes that complete simply to go away without ever becoming defunct. You
5639 can't then wait for them - but we don't want to wait for them in the
5640 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5641 happen for all OS (e.g. *BSD is different).
5643 But that's not the end of the story. Some (many? all?) systems have the
5644 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5645 has by default, so it seems that the difference is merely one of default
5646 (compare restarting vs non-restarting signals).
5648 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5649 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5650 of the loop below. Paranoia rules.
5652 February 2003: That's *still* not the end of the story. There are now versions
5653 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5654 process then calls waitpid(), a grumble is written to the system log, because
5655 this is logically inconsistent. In other words, it doesn't like the paranoia.
5656 As a consequence of this, the waitpid() below is now excluded if we are sure
5657 that SIG_IGN works. */
5659 if (!f.synchronous_delivery)
5662 struct sigaction act;
5663 act.sa_handler = SIG_IGN;
5664 sigemptyset(&(act.sa_mask));
5665 act.sa_flags = SA_NOCLDWAIT;
5666 sigaction(SIGCHLD, &act, NULL);
5668 signal(SIGCHLD, SIG_IGN);
5672 /* Save the current store pool point, for resetting at the start of
5673 each message, and save the real sender address, if any. */
5675 real_sender_address = sender_address;
5677 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5678 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5681 for (BOOL more = TRUE; more; )
5683 rmark reset_point = store_mark();
5686 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5687 input and build the recipients list, before calling receive_msg() to read the
5688 message proper. Whatever sender address is given in the SMTP transaction is
5689 often ignored for local senders - we use the actual sender, which is normally
5690 either the underlying user running this process or a -f argument provided by
5691 a trusted caller. It is saved in real_sender_address. The test for whether to
5692 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5697 if ((rc = smtp_setup_msg()) > 0)
5699 if (real_sender_address != NULL &&
5700 !receive_check_set_sender(sender_address))
5702 sender_address = raw_sender = real_sender_address;
5703 sender_address_unrewritten = NULL;
5706 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5707 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5708 the very end. The result of the ACL is ignored (as for other non-SMTP
5709 messages). It is run for its potential side effects. */
5711 if (smtp_batched_input && acl_not_smtp_start != NULL)
5713 uschar *user_msg, *log_msg;
5714 f.enable_dollar_recipients = TRUE;
5715 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5716 &user_msg, &log_msg);
5717 f.enable_dollar_recipients = FALSE;
5720 /* Now get the data for the message */
5722 more = receive_msg(extract_recipients);
5725 cancel_cutthrough_connection(TRUE, US"receive dropped");
5726 if (more) goto MORELOOP;
5727 smtp_log_no_mail(); /* Log no mail if configured */
5728 exim_exit(EXIT_FAILURE);
5733 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5734 smtp_log_no_mail(); /* Log no mail if configured */
5735 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5739 /* In the non-SMTP case, we have all the information from the command
5740 line, but must process it in case it is in the more general RFC822
5741 format, and in any case, to detect syntax errors. Also, it appears that
5742 the use of comma-separated lists as single arguments is common, so we
5743 had better support them. */
5748 int count = argc - recipients_arg;
5749 uschar **list = argv + recipients_arg;
5751 /* These options cannot be changed dynamically for non-SMTP messages */
5753 f.active_local_sender_retain = local_sender_retain;
5754 f.active_local_from_check = local_from_check;
5756 /* Save before any rewriting */
5758 raw_sender = string_copy(sender_address);
5760 /* Loop for each argument (supplied by user hence tainted) */
5762 for (int i = 0; i < count; i++)
5764 int start, end, domain;
5766 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5767 * We'll still want to cap it to something, just in case. */
5768 uschar * s = string_copy_taint(
5769 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5772 /* Loop for each comma-separated address */
5776 BOOL finished = FALSE;
5778 uschar *ss = parse_find_address_end(s, FALSE);
5780 if (*ss == ',') *ss = 0; else finished = TRUE;
5782 /* Check max recipients - if -t was used, these aren't recipients */
5784 if (recipients_max > 0 && ++rcount > recipients_max &&
5785 !extract_recipients)
5786 if (error_handling == ERRORS_STDERR)
5788 fprintf(stderr, "exim: too many recipients\n");
5789 exim_exit(EXIT_FAILURE);
5793 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5794 errors_sender_rc : EXIT_FAILURE;
5798 BOOL b = allow_utf8_domains;
5799 allow_utf8_domains = TRUE;
5802 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5806 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5807 else allow_utf8_domains = b;
5812 if (domain == 0 && !f.allow_unqualified_recipient)
5815 errmess = US"unqualified recipient address not allowed";
5819 if (error_handling == ERRORS_STDERR)
5821 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5822 string_printing(list[i]), errmess);
5823 exim_exit(EXIT_FAILURE);
5829 eblock.text1 = string_printing(list[i]);
5830 eblock.text2 = errmess;
5832 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5833 errors_sender_rc : EXIT_FAILURE;
5836 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5839 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5843 /* Show the recipients when debugging */
5847 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5848 if (recipients_list)
5850 debug_printf("Recipients:\n");
5851 for (int i = 0; i < recipients_count; i++)
5852 debug_printf(" %s\n", recipients_list[i].address);
5856 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5857 ignored; rejecting here would just add complication, and it can just as
5858 well be done later. Allow $recipients to be visible in the ACL. */
5860 if (acl_not_smtp_start)
5862 uschar *user_msg, *log_msg;
5863 f.enable_dollar_recipients = TRUE;
5864 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5865 &user_msg, &log_msg);
5866 f.enable_dollar_recipients = FALSE;
5869 /* Pause for a while waiting for input. If none received in that time,
5870 close the logfile, if we had one open; then if we wait for a long-running
5871 datasource (months, in one use-case) log rotation will not leave us holding
5874 if (!receive_timeout)
5875 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5878 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5879 will just read the headers for the message, and not write anything onto the
5882 message_ended = END_NOTENDED;
5883 more = receive_msg(extract_recipients);
5885 /* more is always FALSE here (not SMTP message) when reading a message
5886 for real; when reading the headers of a message for filter testing,
5887 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5889 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5890 } /* Non-SMTP message reception */
5892 /* If this is a filter testing run, there are headers in store, but
5893 no message on the spool. Run the filtering code in testing mode, setting
5894 the domain to the qualify domain and the local part to the current user,
5895 unless they have been set by options. The prefix and suffix are left unset
5896 unless specified. The the return path is set to to the sender unless it has
5897 already been set from a return-path header in the message. */
5899 if (filter_test != FTEST_NONE)
5901 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5902 deliver_domain_orig = deliver_domain;
5903 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5904 deliver_localpart_orig = deliver_localpart;
5905 deliver_localpart_prefix = US ftest_prefix;
5906 deliver_localpart_suffix = US ftest_suffix;
5907 deliver_home = originator_home;
5911 printf("Return-path copied from sender\n");
5912 return_path = string_copy(sender_address);
5915 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5916 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5918 receive_add_recipient(
5919 string_sprintf("%s%s%s@%s",
5920 ftest_prefix ? ftest_prefix : US"",
5922 ftest_suffix ? ftest_suffix : US"",
5923 deliver_domain), -1);
5925 printf("Recipient = %s\n", recipients_list[0].address);
5926 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5927 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5929 if (chdir("/")) /* Get away from wherever the user is running this from */
5931 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5932 exim_exit(EXIT_FAILURE);
5935 /* Now we run either a system filter test, or a user filter test, or both.
5936 In the latter case, headers added by the system filter will persist and be
5937 available to the user filter. We need to copy the filter variables
5940 if (filter_test & FTEST_SYSTEM)
5941 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5942 exim_exit(EXIT_FAILURE);
5944 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5946 if (filter_test & FTEST_USER)
5947 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5948 exim_exit(EXIT_FAILURE);
5950 exim_exit(EXIT_SUCCESS);
5953 /* Else act on the result of message reception. We should not get here unless
5954 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5955 will be TRUE. If it is not, check on the number of messages received in this
5958 if ( !session_local_queue_only
5959 && smtp_accept_queue_per_connection > 0
5960 && receive_messagecount > smtp_accept_queue_per_connection)
5962 session_local_queue_only = TRUE;
5963 queue_only_reason = 2;
5966 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5967 and queue_only_load is set, check that the load average is below it. If it is
5968 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5969 default), we put the whole session into queue_only mode. It then remains this
5970 way for any subsequent messages on the same SMTP connection. This is a
5971 deliberate choice; even though the load average may fall, it doesn't seem
5972 right to deliver later messages on the same call when not delivering earlier
5973 ones. However, there are odd cases where this is not wanted, so this can be
5974 changed by setting queue_only_load_latch false. */
5976 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5977 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5979 queue_only_reason = 3;
5980 if (queue_only_load_latch) session_local_queue_only = TRUE;
5983 /* If running as an MUA wrapper, all queueing options and freezing options
5987 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5989 /* Log the queueing here, when it will get a message id attached, but
5990 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5993 if (local_queue_only)
5995 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5996 switch(queue_only_reason)
5999 log_write(L_delay_delivery,
6000 LOG_MAIN, "no immediate delivery: more than %d messages "
6001 "received in one connection", smtp_accept_queue_per_connection);
6005 log_write(L_delay_delivery,
6006 LOG_MAIN, "no immediate delivery: load average %.2f",
6007 (double)load_average/1000.0);
6012 else if (f.queue_only_policy || f.deliver_freeze)
6013 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6015 /* Else do the delivery unless the ACL or local_scan() called for queue only
6016 or froze the message. Always deliver in a separate process. A fork failure is
6017 not a disaster, as the delivery will eventually happen on a subsequent queue
6018 run. The search cache must be tidied before the fork, as the parent will
6019 do it before exiting. The child will trigger a lookup failure and
6020 thereby defer the delivery if it tries to use (for example) a cached ldap
6021 connection that the parent has called unbind on. */
6028 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6031 close_unwanted(); /* Close unwanted file descriptors and TLS */
6032 exim_nullstd(); /* Ensure std{in,out,err} exist */
6034 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6035 mode, deliver_drop_privilege is forced TRUE). */
6037 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6039 delivery_re_exec(CEE_EXEC_EXIT);
6040 /* Control does not return here. */
6043 /* No need to re-exec */
6045 rc = deliver_message(message_id, FALSE, FALSE);
6047 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6048 ? EXIT_SUCCESS : EXIT_FAILURE);
6053 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6054 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6055 "process: %s", strerror(errno));
6059 release_cutthrough_connection(US"msg passed for delivery");
6061 /* In the parent, wait if synchronous delivery is required. This will
6062 always be the case in MUA wrapper mode. */
6064 if (f.synchronous_delivery)
6067 while (wait(&status) != pid);
6068 if ((status & 0x00ff) != 0)
6069 log_write(0, LOG_MAIN|LOG_PANIC,
6070 "process %d crashed with signal %d while delivering %s",
6071 (int)pid, status & 0x00ff, message_id);
6072 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6077 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6078 automatically reaps children (see comments above the loop), clear away any
6079 finished subprocesses here, in case there are lots of messages coming in
6080 from the same source. */
6082 #ifndef SIG_IGN_WORKS
6083 while (waitpid(-1, NULL, WNOHANG) > 0);
6087 return_path = sender_address = NULL;
6088 authenticated_sender = NULL;
6089 deliver_localpart_orig = NULL;
6090 deliver_domain_orig = NULL;
6091 deliver_host = deliver_host_address = NULL;
6092 dnslist_domain = dnslist_matched = NULL;
6093 #ifdef WITH_CONTENT_SCAN
6094 malware_name = NULL;
6096 callout_address = NULL;
6097 sending_ip_address = NULL;
6098 deliver_localpart_data = deliver_domain_data =
6099 recipient_data = sender_data = NULL;
6103 store_reset(reset_point);
6106 exim_exit(EXIT_SUCCESS); /* Never returns */
6107 return 0; /* To stop compiler warning */