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);
1682 /*************************************************
1683 * Entry point and high-level code *
1684 *************************************************/
1686 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1687 the appropriate action. All the necessary functions are present in the one
1688 binary. I originally thought one should split it up, but it turns out that so
1689 much of the apparatus is needed in each chunk that one might as well just have
1690 it all available all the time, which then makes the coding easier as well.
1693 argc count of entries in argv
1694 argv argument strings, with argv[0] being the program name
1696 Returns: EXIT_SUCCESS if terminated successfully
1697 EXIT_FAILURE otherwise, except when a message has been sent
1698 to the sender, and -oee was given
1702 main(int argc, char **cargv)
1704 uschar **argv = USS cargv;
1705 int arg_receive_timeout = -1;
1706 int arg_smtp_receive_timeout = -1;
1707 int arg_error_handling = error_handling;
1708 int filter_sfd = -1;
1709 int filter_ufd = -1;
1712 int list_queue_option = 0;
1714 int msg_action_arg = -1;
1715 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1716 int queue_only_reason = 0;
1718 int perl_start_option = 0;
1720 int recipients_arg = argc;
1721 int sender_address_domain = 0;
1722 int test_retry_arg = -1;
1723 int test_rewrite_arg = -1;
1724 gid_t original_egid;
1725 BOOL arg_queue_only = FALSE;
1726 BOOL bi_option = FALSE;
1727 BOOL checking = FALSE;
1728 BOOL count_queue = FALSE;
1729 BOOL expansion_test = FALSE;
1730 BOOL extract_recipients = FALSE;
1731 BOOL flag_G = FALSE;
1732 BOOL flag_n = FALSE;
1733 BOOL forced_delivery = FALSE;
1734 BOOL f_end_dot = FALSE;
1735 BOOL deliver_give_up = FALSE;
1736 BOOL list_queue = FALSE;
1737 BOOL list_options = FALSE;
1738 BOOL list_config = FALSE;
1739 BOOL local_queue_only;
1740 BOOL one_msg_action = FALSE;
1741 BOOL opt_D_used = FALSE;
1742 BOOL queue_only_set = FALSE;
1743 BOOL receiving_message = TRUE;
1744 BOOL sender_ident_set = FALSE;
1745 BOOL session_local_queue_only;
1747 BOOL removed_privilege = FALSE;
1748 BOOL usage_wanted = FALSE;
1749 BOOL verify_address_mode = FALSE;
1750 BOOL verify_as_sender = FALSE;
1751 BOOL rcpt_verify_quota = FALSE;
1752 BOOL version_printed = FALSE;
1753 uschar *alias_arg = NULL;
1754 uschar *called_as = US"";
1755 uschar *cmdline_syslog_name = NULL;
1756 uschar *start_queue_run_id = NULL;
1757 uschar *stop_queue_run_id = NULL;
1758 uschar *expansion_test_message = NULL;
1759 const uschar *ftest_domain = NULL;
1760 const uschar *ftest_localpart = NULL;
1761 const uschar *ftest_prefix = NULL;
1762 const uschar *ftest_suffix = NULL;
1763 uschar *log_oneline = NULL;
1764 uschar *malware_test_file = NULL;
1765 uschar *real_sender_address;
1766 uschar *originator_home = US"/";
1770 struct stat statbuf;
1771 pid_t passed_qr_pid = (pid_t)0;
1772 int passed_qr_pipe = -1;
1773 gid_t group_list[EXIM_GROUPLIST_SIZE];
1775 /* For the -bI: flag */
1776 enum commandline_info info_flag = CMDINFO_NONE;
1777 BOOL info_stdout = FALSE;
1779 /* Possible options for -R and -S */
1781 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1783 /* Need to define this in case we need to change the environment in order
1784 to get rid of a bogus time zone. We have to make it char rather than uschar
1785 because some OS define it in /usr/include/unistd.h. */
1787 extern char **environ;
1789 #ifdef MEASURE_TIMING
1790 (void)gettimeofday(×tamp_startup, NULL);
1793 store_init(); /* Initialise the memory allocation susbsystem */
1794 pcre_init(); /* Set up memory handling for pcre */
1796 /* If the Exim user and/or group and/or the configuration file owner/group were
1797 defined by ref:name at build time, we must now find the actual uid/gid values.
1798 This is a feature to make the lives of binary distributors easier. */
1800 #ifdef EXIM_USERNAME
1801 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1804 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1806 /* If ref:name uses a number as the name, route_finduser() returns
1807 TRUE with exim_uid set and pw coerced to NULL. */
1809 exim_gid = pw->pw_gid;
1810 #ifndef EXIM_GROUPNAME
1813 "exim: ref:name should specify a usercode, not a group.\n"
1814 "exim: can't let you get away with it unless you also specify a group.\n");
1818 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1821 #ifdef EXIM_GROUPNAME
1822 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1823 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1826 #ifdef CONFIGURE_OWNERNAME
1827 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1828 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1829 CONFIGURE_OWNERNAME);
1832 /* We default the system_filter_user to be the Exim run-time user, as a
1833 sane non-root value. */
1834 system_filter_uid = exim_uid;
1836 #ifdef CONFIGURE_GROUPNAME
1837 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1838 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1839 CONFIGURE_GROUPNAME);
1842 /* In the Cygwin environment, some initialization used to need doing.
1843 It was fudged in by means of this macro; now no longer but we'll leave
1844 it in case of others. */
1850 /* Check a field which is patched when we are running Exim within its
1851 testing harness; do a fast initial check, and then the whole thing. */
1853 f.running_in_test_harness =
1854 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1855 if (f.running_in_test_harness)
1858 /* Protect against abusive argv[0] */
1859 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1860 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1862 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1863 at the start of a program; however, it seems that some environments do not
1864 follow this. A "strange" locale can affect the formatting of timestamps, so we
1867 setlocale(LC_ALL, "C");
1869 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1871 #ifdef _POSIX_MONOTONIC_CLOCK
1875 /* Set up the default handler for timing using alarm(). */
1877 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1879 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1880 because store_malloc writes a log entry on failure. */
1882 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1883 exim_fail("exim: failed to get store for log buffer\n");
1885 /* Initialize the default log options. */
1887 bits_set(log_selector, log_selector_size, log_default);
1889 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1890 NULL when the daemon is run and the file is closed. We have to use this
1891 indirection, because some systems don't allow writing to the variable "stderr".
1894 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1896 /* Ensure there is a big buffer for temporary use in several places. It is put
1897 in malloc store so that it can be freed for enlargement if necessary. */
1899 big_buffer = store_malloc(big_buffer_size);
1901 /* Set up the handler for the data request signal, and set the initial
1902 descriptive text. */
1904 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1905 set_process_info("initializing");
1906 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1909 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1910 sigaction(SIGSEGV, &act, NULL);
1913 signal(SIGSEGV, segv_handler); /* log faults */
1916 /* If running in a dockerized environment, the TERM signal is only
1917 delegated to the PID 1 if we request it by setting an signal handler */
1918 if (getpid() == 1) signal(SIGTERM, term_handler);
1920 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1921 in the daemon code. For the rest of Exim's uses, we ignore it. */
1923 signal(SIGHUP, SIG_IGN);
1925 /* We don't want to die on pipe errors as the code is written to handle
1926 the write error instead. */
1928 signal(SIGPIPE, SIG_IGN);
1930 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1931 set to SIG_IGN. This causes subprocesses that complete before the parent
1932 process waits for them not to hang around, so when Exim calls wait(), nothing
1933 is there. The wait() code has been made robust against this, but let's ensure
1934 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1935 ending status. We use sigaction rather than plain signal() on those OS where
1936 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1937 problem on AIX with this.) */
1941 struct sigaction act;
1942 act.sa_handler = SIG_DFL;
1943 sigemptyset(&(act.sa_mask));
1945 sigaction(SIGCHLD, &act, NULL);
1948 signal(SIGCHLD, SIG_DFL);
1951 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1956 /* Set up the version number. Set up the leading 'E' for the external form of
1957 message ids, set the pointer to the internal form, and initialize it to
1958 indicate no message being processed. */
1961 message_id_option[0] = '-';
1962 message_id_external = message_id_option + 1;
1963 message_id_external[0] = 'E';
1964 message_id = message_id_external + 1;
1967 /* Set the umask to zero so that any files Exim creates using open() are
1968 created with the modes that it specifies. NOTE: Files created with fopen() have
1969 a problem, which was not recognized till rather late (February 2006). With this
1970 umask, such files will be world writeable. (They are all content scanning files
1971 in the spool directory, which isn't world-accessible, so this is not a
1972 disaster, but it's untidy.) I don't want to change this overall setting,
1973 however, because it will interact badly with the open() calls. Instead, there's
1974 now a function called modefopen() that fiddles with the umask while calling
1979 /* Precompile the regular expression for matching a message id. Keep this in
1980 step with the code that generates ids in the accept.c module. We need to do
1981 this here, because the -M options check their arguments for syntactic validity
1982 using mac_ismsgid, which uses this. */
1985 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
1987 /* Precompile the regular expression that is used for matching an SMTP error
1988 code, possibly extended, at the start of an error message. Note that the
1989 terminating whitespace character is included. */
1992 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1995 #ifdef WHITELIST_D_MACROS
1996 /* Precompile the regular expression used to filter the content of macros
1997 given to -D for permissibility. */
1999 regex_whitelisted_macro =
2000 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2003 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2004 this seems to be a generally accepted convention, since one finds symbolic
2005 links called "mailq" in standard OS configurations. */
2007 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2008 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2011 receiving_message = FALSE;
2012 called_as = US"-mailq";
2015 /* If the program is called as "rmail" treat it as equivalent to
2016 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2017 i.e. preventing a single dot on a line from terminating the message, and
2018 returning with zero return code, even in cases of error (provided an error
2019 message has been sent). */
2021 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2022 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2025 called_as = US"-rmail";
2026 errors_sender_rc = EXIT_SUCCESS;
2029 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2030 this is a smail convention. */
2032 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2033 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2035 smtp_input = smtp_batched_input = TRUE;
2036 called_as = US"-rsmtp";
2039 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2040 this is a smail convention. */
2042 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2043 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2046 receiving_message = FALSE;
2047 called_as = US"-runq";
2050 /* If the program is called as "newaliases" treat it as equivalent to
2051 "exim -bi"; this is a sendmail convention. */
2053 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2054 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2057 receiving_message = FALSE;
2058 called_as = US"-newaliases";
2061 /* Save the original effective uid for a couple of uses later. It should
2062 normally be root, but in some esoteric environments it may not be. */
2064 original_euid = geteuid();
2065 original_egid = getegid();
2067 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2068 to be the same as the real ones. This makes a difference only if Exim is setuid
2069 (or setgid) to something other than root, which could be the case in some
2070 special configurations. */
2072 real_uid = getuid();
2073 real_gid = getgid();
2075 if (real_uid == root_uid)
2077 if ((rv = setgid(real_gid)))
2078 exim_fail("exim: setgid(%ld) failed: %s\n",
2079 (long int)real_gid, strerror(errno));
2080 if ((rv = setuid(real_uid)))
2081 exim_fail("exim: setuid(%ld) failed: %s\n",
2082 (long int)real_uid, strerror(errno));
2085 /* If neither the original real uid nor the original euid was root, Exim is
2086 running in an unprivileged state. */
2088 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2090 /* For most of the args-parsing we need to use permanent pool memory */
2092 int old_pool = store_pool;
2093 store_pool = POOL_PERM;
2095 /* Scan the program's arguments. Some can be dealt with right away; others are
2096 simply recorded for checking and handling afterwards. Do a high-level switch
2097 on the second character (the one after '-'), to save some effort. */
2099 for (i = 1; i < argc; i++)
2101 BOOL badarg = FALSE;
2102 uschar * arg = argv[i];
2106 /* An argument not starting with '-' is the start of a recipients list;
2107 break out of the options-scanning loop. */
2115 /* An option consisting of -- terminates the options */
2117 if (Ustrcmp(arg, "--") == 0)
2119 recipients_arg = i + 1;
2123 /* Handle flagged options */
2125 switchchar = arg[1];
2128 /* Make all -ex options synonymous with -oex arguments, since that
2129 is assumed by various callers. Also make -qR options synonymous with -R
2130 options, as that seems to be required as well. Allow for -qqR too, and
2131 the same for -S options. */
2133 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2134 Ustrncmp(arg+1, "qR", 2) == 0 ||
2135 Ustrncmp(arg+1, "qS", 2) == 0)
2137 switchchar = arg[2];
2140 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2142 switchchar = arg[3];
2144 f.queue_2stage = TRUE;
2147 /* Make -r synonymous with -f, since it is a documented alias */
2149 else if (arg[1] == 'r') switchchar = 'f';
2151 /* Make -ov synonymous with -v */
2153 else if (Ustrcmp(arg, "-ov") == 0)
2159 /* deal with --option_aliases */
2160 else if (switchchar == '-')
2162 if (Ustrcmp(argrest, "help") == 0)
2164 usage_wanted = TRUE;
2167 else if (Ustrcmp(argrest, "version") == 0)
2174 /* High-level switch on active initial letter */
2179 /* sendmail uses -Ac and -Am to control which .cf file is used;
2182 if (!*argrest) { badarg = TRUE; break; }
2185 BOOL ignore = FALSE;
2190 if (*(argrest + 1) == '\0')
2194 if (!ignore) badarg = TRUE;
2198 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2199 so has no need of it. */
2202 if (!*argrest) i++; /* Skip over the type */
2208 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2212 /* -bd: Run in daemon mode, awaiting SMTP connections.
2213 -bdf: Ditto, but in the foreground.
2216 f.daemon_listen = f.daemon_scion = TRUE;
2217 if (*argrest == 'f') f.background_daemon = FALSE;
2218 else if (*argrest) badarg = TRUE;
2221 /* -be: Run in expansion test mode
2222 -bem: Ditto, but read a message from a file first
2225 expansion_test = checking = TRUE;
2226 if (*argrest == 'm')
2228 if (++i >= argc) { badarg = TRUE; break; }
2229 expansion_test_message = argv[i];
2232 if (*argrest) badarg = TRUE;
2235 /* -bF: Run system filter test */
2237 filter_test |= checking = FTEST_SYSTEM;
2238 if (*argrest) badarg = TRUE;
2239 else if (++i < argc) filter_test_sfile = argv[i];
2240 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2243 /* -bf: Run user filter test
2244 -bfd: Set domain for filter testing
2245 -bfl: Set local part for filter testing
2246 -bfp: Set prefix for filter testing
2247 -bfs: Set suffix for filter testing
2252 filter_test |= checking = FTEST_USER;
2253 if (++i < argc) filter_test_ufile = argv[i];
2254 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2259 exim_fail("exim: string expected after %s\n", arg);
2260 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2261 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2262 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2263 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2268 /* -bh: Host checking - an IP address must follow. */
2270 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2272 if (++i >= argc) { badarg = TRUE; break; }
2273 sender_host_address = string_copy_taint(
2274 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2276 host_checking = checking = f.log_testing_mode = TRUE;
2277 f.host_checking_callout = *argrest == 'c';
2278 message_logs = FALSE;
2283 /* -bi: This option is used by sendmail to initialize *the* alias file,
2284 though it has the -oA option to specify a different file. Exim has no
2285 concept of *the* alias file, but since Sun's YP make script calls
2286 sendmail this way, some support must be provided. */
2288 if (!*argrest) bi_option = TRUE;
2292 /* -bI: provide information, of the type to follow after a colon.
2293 This is an Exim flag. */
2295 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2297 uschar *p = argrest+1;
2298 info_flag = CMDINFO_HELP;
2300 if (strcmpic(p, CUS"sieve") == 0)
2302 info_flag = CMDINFO_SIEVE;
2305 else if (strcmpic(p, CUS"dscp") == 0)
2307 info_flag = CMDINFO_DSCP;
2310 else if (strcmpic(p, CUS"help") == 0)
2316 /* -bm: Accept and deliver message - the default option. Reinstate
2317 receiving_message, which got turned off for all -b options.
2318 -bmalware: test the filename given for malware */
2320 if (!*argrest) receiving_message = TRUE;
2321 else if (Ustrcmp(argrest, "alware") == 0)
2323 if (++i >= argc) { badarg = TRUE; break; }
2325 malware_test_file = argv[i];
2330 /* -bnq: For locally originating messages, do not qualify unqualified
2331 addresses. In the envelope, this causes errors; in header lines they
2334 if (Ustrcmp(argrest, "q") == 0)
2336 f.allow_unqualified_sender = FALSE;
2337 f.allow_unqualified_recipient = FALSE;
2342 /* -bpxx: List the contents of the mail queue, in various forms. If
2343 the option is -bpc, just a queue count is needed. Otherwise, if the
2344 first letter after p is r, then order is random. */
2346 if (*argrest == 'c')
2349 if (*++argrest) badarg = TRUE;
2353 if (*argrest == 'r')
2355 list_queue_option = 8;
2358 else list_queue_option = 0;
2362 /* -bp: List the contents of the mail queue, top-level only */
2366 /* -bpu: List the contents of the mail queue, top-level undelivered */
2368 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2370 /* -bpa: List the contents of the mail queue, including all delivered */
2372 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2374 /* Unknown after -bp[r] */
2380 /* -bP: List the configuration variables given as the address list.
2381 Force -v, so configuration errors get displayed. */
2384 /* -bP config: we need to setup here, because later,
2385 when list_options is checked, the config is read already */
2388 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2391 readconf_save_config(version_string);
2395 list_options = TRUE;
2396 debug_selector |= D_v;
2397 debug_file = stderr;
2401 /* -brt: Test retry configuration lookup */
2403 if (Ustrcmp(argrest, "t") == 0)
2406 test_retry_arg = i + 1;
2410 /* -brw: Test rewrite configuration */
2412 else if (Ustrcmp(argrest, "w") == 0)
2415 test_rewrite_arg = i + 1;
2421 /* -bS: Read SMTP commands on standard input, but produce no replies -
2422 all errors are reported by sending messages. */
2425 smtp_input = smtp_batched_input = receiving_message = TRUE;
2429 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2430 on standard output. */
2432 if (!*argrest) smtp_input = receiving_message = TRUE;
2436 /* -bt: address testing mode */
2439 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2443 /* -bv: verify addresses */
2446 verify_address_mode = checking = f.log_testing_mode = TRUE;
2448 /* -bvs: verify sender addresses */
2450 else if (Ustrcmp(argrest, "s") == 0)
2452 verify_address_mode = checking = f.log_testing_mode = TRUE;
2453 verify_as_sender = TRUE;
2458 /* -bV: Print version string and support details */
2462 printf("Exim version %s #%s built %s\n", version_string,
2463 version_cnumber, version_date);
2464 printf("%s\n", CS version_copyright);
2465 version_printed = TRUE;
2466 show_whats_supported(TRUE);
2467 f.log_testing_mode = TRUE;
2472 /* -bw: inetd wait mode, accept a listening socket as stdin */
2474 f.inetd_wait_mode = TRUE;
2475 f.background_daemon = FALSE;
2476 f.daemon_listen = f.daemon_scion = TRUE;
2478 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2479 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2490 /* -C: change configuration file list; ignore if it isn't really
2491 a change! Enforce a prefix check if required. */
2495 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2496 if (Ustrcmp(config_main_filelist, argrest) != 0)
2498 #ifdef ALT_CONFIG_PREFIX
2500 int len = Ustrlen(ALT_CONFIG_PREFIX);
2501 const uschar *list = argrest;
2503 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2504 while((filename = string_nextinlist(&list, &sep, big_buffer,
2506 if ( ( Ustrlen(filename) < len
2507 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2508 || Ustrstr(filename, "/../") != NULL
2510 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2512 exim_fail("-C Permission denied\n");
2514 if (real_uid != root_uid)
2516 #ifdef TRUSTED_CONFIG_LIST
2518 if (real_uid != exim_uid
2519 #ifdef CONFIGURE_OWNER
2520 && real_uid != config_uid
2523 f.trusted_config = FALSE;
2526 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2529 struct stat statbuf;
2531 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2532 (statbuf.st_uid != root_uid /* owner not root */
2533 #ifdef CONFIGURE_OWNER
2534 && statbuf.st_uid != config_uid /* owner not the special one */
2537 (statbuf.st_gid != root_gid /* group not root */
2538 #ifdef CONFIGURE_GROUP
2539 && statbuf.st_gid != config_gid /* group not the special one */
2541 && (statbuf.st_mode & 020) != 0 /* group writeable */
2543 (statbuf.st_mode & 2) != 0) /* world writeable */
2545 f.trusted_config = FALSE;
2550 /* Well, the trust list at least is up to scratch... */
2552 uschar *trusted_configs[32];
2555 int old_pool = store_pool;
2556 store_pool = POOL_MAIN;
2558 reset_point = store_mark();
2559 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2561 uschar *start = big_buffer, *nl;
2562 while (*start && isspace(*start))
2566 nl = Ustrchr(start, '\n');
2569 trusted_configs[nr_configs++] = string_copy(start);
2570 if (nr_configs == nelem(trusted_configs))
2578 const uschar *list = argrest;
2580 while (f.trusted_config && (filename = string_nextinlist(&list,
2581 &sep, big_buffer, big_buffer_size)))
2583 for (i=0; i < nr_configs; i++)
2584 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2586 if (i == nr_configs)
2588 f.trusted_config = FALSE;
2593 else /* No valid prefixes found in trust_list file. */
2594 f.trusted_config = FALSE;
2595 store_reset(reset_point);
2596 store_pool = old_pool;
2599 else /* Could not open trust_list file. */
2600 f.trusted_config = FALSE;
2603 /* Not root; don't trust config */
2604 f.trusted_config = FALSE;
2608 config_main_filelist = argrest;
2609 f.config_changed = TRUE;
2614 /* -D: set up a macro definition */
2617 #ifdef DISABLE_D_OPTION
2618 exim_fail("exim: -D is not available in this Exim binary\n");
2624 uschar *s = argrest;
2627 while (isspace(*s)) s++;
2629 if (*s < 'A' || *s > 'Z')
2630 exim_fail("exim: macro name set by -D must start with "
2631 "an upper case letter\n");
2633 while (isalnum(*s) || *s == '_')
2635 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2639 if (ptr == 0) { badarg = TRUE; break; }
2640 while (isspace(*s)) s++;
2643 if (*s++ != '=') { badarg = TRUE; break; }
2644 while (isspace(*s)) s++;
2647 for (m = macros_user; m; m = m->next)
2648 if (Ustrcmp(m->name, name) == 0)
2649 exim_fail("exim: duplicated -D in command line\n");
2651 m = macro_create(name, s, TRUE);
2653 if (clmacro_count >= MAX_CLMACROS)
2654 exim_fail("exim: too many -D options on command line\n");
2655 clmacros[clmacro_count++] =
2656 string_sprintf("-D%s=%s", m->name, m->replacement);
2663 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2665 if (Ustrcmp(argrest, "ropcr") == 0)
2667 /* drop_cr = TRUE; */
2670 /* -dp: Set up a debug pretrigger buffer with given size. */
2672 else if (Ustrcmp(argrest, "p") == 0)
2676 debug_pretrigger_setup(argv[i]);
2678 /* -dt: Set a debug trigger selector */
2680 else if (Ustrncmp(argrest, "t=", 2) == 0)
2681 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2683 /* -d: Set debug level (see also -v below).
2684 If -dd is used, debugging subprocesses of the daemon is disabled. */
2688 /* Use an intermediate variable so that we don't set debugging while
2689 decoding the debugging bits. */
2691 unsigned int selector = D_default;
2694 if (*argrest == 'd')
2696 f.debug_daemon = TRUE;
2700 decode_bits(&selector, 1, debug_notall, argrest,
2701 debug_options, debug_options_count, US"debug", 0);
2702 debug_selector = selector;
2707 /* -E: This is a local error message. This option is not intended for
2708 external use at all, but is not restricted to trusted callers because it
2709 does no harm (just suppresses certain error messages) and if Exim is run
2710 not setuid root it won't always be trusted when it generates error
2711 messages using this option. If there is a message id following -E, point
2712 message_reference at it, for logging. */
2715 f.local_error_message = TRUE;
2716 if (mac_ismsgid(argrest)) message_reference = argrest;
2720 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2721 option, so it looks as if historically the -oex options are also callable
2722 without the leading -o. So we have to accept them. Before the switch,
2723 anything starting -oe has been converted to -e. Exim does not support all
2724 of the sendmail error options. */
2727 if (Ustrcmp(argrest, "e") == 0)
2729 arg_error_handling = ERRORS_SENDER;
2730 errors_sender_rc = EXIT_SUCCESS;
2732 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2733 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2734 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2735 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2740 /* -F: Set sender's full name, used instead of the gecos entry from
2741 the password file. Since users can usually alter their gecos entries,
2742 there's no security involved in using this instead. The data can follow
2743 the -F or be in the next argument. */
2747 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2748 originator_name = string_copy_taint(
2749 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2751 f.sender_name_forced = TRUE;
2755 /* -f: Set sender's address - this value is only actually used if Exim is
2756 run by a trusted user, or if untrusted_set_sender is set and matches the
2757 address, except that the null address can always be set by any user. The
2758 test for this happens later, when the value given here is ignored when not
2759 permitted. For an untrusted user, the actual sender is still put in Sender:
2760 if it doesn't match the From: header (unless no_local_from_check is set).
2761 The data can follow the -f or be in the next argument. The -r switch is an
2762 obsolete form of -f but since there appear to be programs out there that
2763 use anything that sendmail has ever supported, better accept it - the
2764 synonymizing is done before the switch above.
2766 At this stage, we must allow domain literal addresses, because we don't
2767 know what the setting of allow_domain_literals is yet. Ditto for trailing
2768 dots and strip_trailing_dot. */
2772 int dummy_start, dummy_end;
2775 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2776 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2778 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2781 uschar * temp = argrest + Ustrlen(argrest) - 1;
2782 while (temp >= argrest && isspace(*temp)) temp--;
2783 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2784 allow_domain_literals = TRUE;
2785 strip_trailing_dot = TRUE;
2787 allow_utf8_domains = TRUE;
2789 if (!(sender_address = parse_extract_address(argrest, &errmess,
2790 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2791 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2793 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2795 message_smtputf8 = string_is_utf8(sender_address);
2796 allow_utf8_domains = FALSE;
2798 allow_domain_literals = FALSE;
2799 strip_trailing_dot = FALSE;
2801 f.sender_address_forced = TRUE;
2805 /* -G: sendmail invocation to specify that it's a gateway submission and
2806 sendmail may complain about problems instead of fixing them.
2807 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2808 not at this time complain about problems. */
2814 /* -h: Set the hop count for an incoming message. Exim does not currently
2815 support this; it always computes it by counting the Received: headers.
2816 To put it in will require a change to the spool header file format. */
2820 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2821 if (!isdigit(*argrest)) badarg = TRUE;
2825 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2826 not to be documented for sendmail but mailx (at least) uses it) */
2829 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2833 /* -L: set the identifier used for syslog; equivalent to setting
2834 syslog_processname in the config file, but needs to be an admin option. */
2838 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2839 if ((sz = Ustrlen(argrest)) > 32)
2840 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2842 exim_fail("exim: the -L syslog name is too short\n");
2843 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2847 receiving_message = FALSE;
2849 /* -MC: continue delivery of another message via an existing open
2850 file descriptor. This option is used for an internal call by the
2851 smtp transport when there is a pending message waiting to go to an
2852 address to which it has got a connection. Five subsequent arguments are
2853 required: transport name, host name, IP address, sequence number, and
2854 message_id. Transports may decline to create new processes if the sequence
2855 number gets too big. The channel is stdin. This (-MC) must be the last
2856 argument. There's a subsequent check that the real-uid is privileged.
2858 If we are running in the test harness. delay for a bit, to let the process
2859 that set this one up complete. This makes for repeatability of the logging,
2862 if (Ustrcmp(argrest, "C") == 0)
2864 union sockaddr_46 interface_sock;
2865 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2868 exim_fail("exim: too many or too few arguments after -MC\n");
2870 if (msg_action_arg >= 0)
2871 exim_fail("exim: incompatible arguments\n");
2873 continue_transport = string_copy_taint(
2874 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2876 continue_hostname = string_copy_taint(
2877 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2879 continue_host_address = string_copy_taint(
2880 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2882 continue_sequence = Uatoi(argv[++i]);
2883 msg_action = MSG_DELIVER;
2884 msg_action_arg = ++i;
2885 forced_delivery = TRUE;
2886 queue_run_pid = passed_qr_pid;
2887 queue_run_pipe = passed_qr_pipe;
2889 if (!mac_ismsgid(argv[i]))
2890 exim_fail("exim: malformed message id %s after -MC option\n",
2893 /* Set up $sending_ip_address and $sending_port, unless proxied */
2895 if (!continue_proxy_cipher)
2896 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2898 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2901 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2904 testharness_pause_ms(500);
2908 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2912 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2913 precedes -MC (see above). The flag indicates that the host to which
2914 Exim is connected has accepted an AUTH sequence. */
2916 case 'A': f.smtp_authenticated = TRUE; break;
2918 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2919 that exim is connected to supports the esmtp extension DSN */
2921 case 'D': smtp_peer_options |= OPTION_DSN; break;
2923 /* -MCd: for debug, set a process-purpose string */
2925 case 'd': if (++i < argc)
2926 process_purpose = string_copy_taint(
2927 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2932 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2933 from the commandline should be tainted - but we will need an untainted
2934 value for the spoolfile when doing a -odi delivery process. */
2936 case 'G': if (++i < argc) queue_name = string_copy_taint(
2937 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2942 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2944 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2946 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2947 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2948 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2950 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2952 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2957 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2958 it preceded -MC (see above) */
2960 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2962 #ifdef SUPPORT_SOCKS
2963 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2964 case 'p': proxy_session = TRUE;
2967 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
2970 proxy_local_port = Uatoi(argv[i]);
2973 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
2976 proxy_external_port = Uatoi(argv[i]);
2982 /* -MCQ: pass on the pid of the queue-running process that started
2983 this chain of deliveries and the fd of its synchronizing pipe; this
2984 is useful only when it precedes -MC (see above) */
2986 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2988 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2992 /* -MCq: do a quota check on the given recipient for the given size
2993 of message. Separate from -MC. */
2994 case 'q': rcpt_verify_quota = TRUE;
2995 if (++i < argc) message_size = Uatoi(argv[i]);
2999 /* -MCS: set the smtp_use_size flag; this is useful only when it
3000 precedes -MC (see above) */
3002 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3005 /* -MCs: used with -MCt; SNI was sent */
3006 /* -MCr: ditto, DANE */
3009 case 's': if (++i < argc)
3011 continue_proxy_sni = string_copy_taint(
3012 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3014 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3019 /* -MCt: similar to -MCT below but the connection is still open
3020 via a proxy process which handles the TLS context and coding.
3021 Require three arguments for the proxied local address and port,
3022 and the TLS cipher. */
3024 case 't': if (++i < argc)
3025 sending_ip_address = string_copy_taint(
3026 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3030 sending_port = (int)(Uatol(argv[i]));
3033 continue_proxy_cipher = string_copy_taint(
3034 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3039 /* -MCT: set the tls_offered flag; this is useful only when it
3040 precedes -MC (see above). The flag indicates that the host to which
3041 Exim is connected has offered TLS support. */
3043 case 'T': smtp_peer_options |= OPTION_TLS; break;
3046 default: badarg = TRUE; break;
3051 /* -M[x]: various operations on the following list of message ids:
3052 -M deliver the messages, ignoring next retry times and thawing
3053 -Mc deliver the messages, checking next retry times, no thawing
3054 -Mf freeze the messages
3055 -Mg give up on the messages
3056 -Mt thaw the messages
3057 -Mrm remove the messages
3058 In the above cases, this must be the last option. There are also the
3059 following options which are followed by a single message id, and which
3060 act on that message. Some of them use the "recipient" addresses as well.
3061 -Mar add recipient(s)
3062 -MG move to a different queue
3063 -Mmad mark all recipients delivered
3064 -Mmd mark recipients(s) delivered
3066 -Mset load a message for use with -be
3068 -Mvc show copy (of whole message, in RFC 2822 format)
3075 msg_action = MSG_DELIVER;
3076 forced_delivery = f.deliver_force_thaw = TRUE;
3078 else if (Ustrcmp(argrest, "ar") == 0)
3080 msg_action = MSG_ADD_RECIPIENT;
3081 one_msg_action = TRUE;
3083 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3084 else if (Ustrcmp(argrest, "es") == 0)
3086 msg_action = MSG_EDIT_SENDER;
3087 one_msg_action = TRUE;
3089 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3090 else if (Ustrcmp(argrest, "g") == 0)
3092 msg_action = MSG_DELIVER;
3093 deliver_give_up = TRUE;
3095 else if (Ustrcmp(argrest, "G") == 0)
3097 msg_action = MSG_SETQUEUE;
3098 queue_name_dest = string_copy_taint(
3099 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3102 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3103 else if (Ustrcmp(argrest, "md") == 0)
3105 msg_action = MSG_MARK_DELIVERED;
3106 one_msg_action = TRUE;
3108 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3109 else if (Ustrcmp(argrest, "set") == 0)
3111 msg_action = MSG_LOAD;
3112 one_msg_action = TRUE;
3114 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3115 else if (Ustrcmp(argrest, "vb") == 0)
3117 msg_action = MSG_SHOW_BODY;
3118 one_msg_action = TRUE;
3120 else if (Ustrcmp(argrest, "vc") == 0)
3122 msg_action = MSG_SHOW_COPY;
3123 one_msg_action = TRUE;
3125 else if (Ustrcmp(argrest, "vh") == 0)
3127 msg_action = MSG_SHOW_HEADER;
3128 one_msg_action = TRUE;
3130 else if (Ustrcmp(argrest, "vl") == 0)
3132 msg_action = MSG_SHOW_LOG;
3133 one_msg_action = TRUE;
3135 else { badarg = TRUE; break; }
3137 /* All the -Mxx options require at least one message id. */
3139 msg_action_arg = i + 1;
3140 if (msg_action_arg >= argc)
3141 exim_fail("exim: no message ids given after %s option\n", arg);
3143 /* Some require only message ids to follow */
3145 if (!one_msg_action)
3147 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3148 exim_fail("exim: malformed message id %s after %s option\n",
3150 goto END_ARG; /* Remaining args are ids */
3153 /* Others require only one message id, possibly followed by addresses,
3154 which will be handled as normal arguments. */
3158 if (!mac_ismsgid(argv[msg_action_arg]))
3159 exim_fail("exim: malformed message id %s after %s option\n",
3160 argv[msg_action_arg], arg);
3166 /* Some programs seem to call the -om option without the leading o;
3167 for sendmail it askes for "me too". Exim always does this. */
3170 if (*argrest) badarg = TRUE;
3174 /* -N: don't do delivery - a debugging option that stops transports doing
3175 their thing. It implies debugging at the D_v level. */
3180 f.dont_deliver = TRUE;
3181 debug_selector |= D_v;
3182 debug_file = stderr;
3188 /* -n: This means "don't alias" in sendmail, apparently.
3189 For normal invocations, it has no effect.
3190 It may affect some other options. */
3196 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3197 option to the specified value. This form uses long names. We need to handle
3198 -O option=value and -Ooption=value. */
3203 exim_fail("exim: string expected after -O\n");
3209 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3212 if (!*(alias_arg = argrest))
3213 if (i+1 < argc) alias_arg = argv[++i];
3214 else exim_fail("exim: string expected after -oA\n");
3217 /* -oB: Set a connection message max value for remote deliveries */
3220 uschar * p = argrest;
3222 if (i+1 < argc && isdigit((argv[i+1][0])))
3226 connection_max_messages = 1;
3233 exim_fail("exim: number expected after -oB\n");
3234 connection_max_messages = Uatoi(p);
3239 /* -odb: background delivery */
3242 if (Ustrcmp(argrest, "b") == 0)
3244 f.synchronous_delivery = FALSE;
3245 arg_queue_only = FALSE;
3246 queue_only_set = TRUE;
3249 /* -odd: testsuite-only: add no inter-process delays */
3251 else if (Ustrcmp(argrest, "d") == 0)
3252 f.testsuite_delays = FALSE;
3254 /* -odf: foreground delivery (smail-compatible option); same effect as
3255 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3258 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3260 f.synchronous_delivery = TRUE;
3261 arg_queue_only = FALSE;
3262 queue_only_set = TRUE;
3265 /* -odq: queue only */
3267 else if (Ustrcmp(argrest, "q") == 0)
3269 f.synchronous_delivery = FALSE;
3270 arg_queue_only = TRUE;
3271 queue_only_set = TRUE;
3274 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3275 but no remote delivery */
3277 else if (Ustrcmp(argrest, "qs") == 0)
3279 f.queue_smtp = TRUE;
3280 arg_queue_only = FALSE;
3281 queue_only_set = TRUE;
3286 /* -oex: Sendmail error flags. As these are also accepted without the
3287 leading -o prefix, for compatibility with vacation and other callers,
3288 they are handled with -e above. */
3290 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3291 -oitrue: Another sendmail syntax for the same */
3294 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3299 /* -oM*: Set various characteristics for an incoming message; actually
3300 acted on for trusted callers only. */
3305 exim_fail("exim: data expected after -oM%s\n", argrest);
3307 /* -oMa: Set sender host address */
3309 if (Ustrcmp(argrest, "a") == 0)
3310 sender_host_address = string_copy_taint(
3311 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3314 /* -oMaa: Set authenticator name */
3316 else if (Ustrcmp(argrest, "aa") == 0)
3317 sender_host_authenticated = string_copy_taint(
3318 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3321 /* -oMas: setting authenticated sender */
3323 else if (Ustrcmp(argrest, "as") == 0)
3324 authenticated_sender = string_copy_taint(
3325 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3328 /* -oMai: setting authenticated id */
3330 else if (Ustrcmp(argrest, "ai") == 0)
3331 authenticated_id = string_copy_taint(
3332 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3335 /* -oMi: Set incoming interface address */
3337 else if (Ustrcmp(argrest, "i") == 0)
3338 interface_address = string_copy_taint(
3339 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3342 /* -oMm: Message reference */
3344 else if (Ustrcmp(argrest, "m") == 0)
3346 if (!mac_ismsgid(argv[i+1]))
3347 exim_fail("-oMm must be a valid message ID\n");
3348 if (!f.trusted_config)
3349 exim_fail("-oMm must be called by a trusted user/config\n");
3350 message_reference = argv[++i];
3353 /* -oMr: Received protocol */
3355 else if (Ustrcmp(argrest, "r") == 0)
3357 if (received_protocol)
3358 exim_fail("received_protocol is set already\n");
3360 received_protocol = string_copy_taint(
3361 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3364 /* -oMs: Set sender host name */
3366 else if (Ustrcmp(argrest, "s") == 0)
3367 sender_host_name = string_copy_taint(
3368 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3371 /* -oMt: Set sender ident */
3373 else if (Ustrcmp(argrest, "t") == 0)
3375 sender_ident_set = TRUE;
3376 sender_ident = string_copy_taint(
3377 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3381 /* Else a bad argument */
3388 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3389 seem to call this as -m (undocumented), so that is also accepted (see
3391 /* -oo: An ancient flag for old-style addresses which still seems to
3392 crop up in some calls (see in SCO). */
3396 if (*argrest) badarg = TRUE;
3399 /* -oP <name>: set pid file path for daemon
3400 -oPX: delete pid file of daemon */
3403 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3404 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3405 "(uid=%d euid=%d | %d)\n",
3406 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3407 if (!*argrest) override_pid_file_path = argv[++i];
3408 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3413 /* -or <n>: set timeout for non-SMTP acceptance
3414 -os <n>: set timeout for SMTP acceptance */
3419 int * tp = argrest[-1] == 'r'
3420 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3422 *tp = readconf_readtime(argrest, 0, FALSE);
3423 else if (i+1 < argc)
3424 *tp = readconf_readtime(argv[++i], 0, FALSE);
3427 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3431 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3432 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3435 if (*argrest) badarg = TRUE;
3436 else override_local_interfaces = string_copy_taint(
3437 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3441 /* -oY: Override creation of daemon notifier socket */
3444 if (*argrest) badarg = TRUE;
3445 else notifier_socket = NULL;
3448 /* Unknown -o argument */
3456 /* -ps: force Perl startup; -pd force delayed Perl startup */
3460 if (*argrest == 's' && argrest[1] == 0)
3462 perl_start_option = 1;
3465 if (*argrest == 'd' && argrest[1] == 0)
3467 perl_start_option = -1;
3472 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3473 which sets the host protocol and host name */
3476 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3480 uschar * hn = Ustrchr(argrest, ':');
3482 if (received_protocol)
3483 exim_fail("received_protocol is set already\n");
3486 received_protocol = string_copy_taint(
3487 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3491 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3492 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3493 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3500 receiving_message = FALSE;
3501 if (queue_interval >= 0)
3502 exim_fail("exim: -q specified more than once\n");
3504 /* -qq...: Do queue runs in a 2-stage manner */
3506 if (*argrest == 'q')
3508 f.queue_2stage = TRUE;
3512 /* -qi...: Do only first (initial) deliveries */
3514 if (*argrest == 'i')
3516 f.queue_run_first_delivery = TRUE;
3520 /* -qf...: Run the queue, forcing deliveries
3521 -qff..: Ditto, forcing thawing as well */
3523 if (*argrest == 'f')
3525 f.queue_run_force = TRUE;
3526 if (*++argrest == 'f')
3528 f.deliver_force_thaw = TRUE;
3533 /* -q[f][f]l...: Run the queue only on local deliveries */
3535 if (*argrest == 'l')
3537 f.queue_run_local = TRUE;
3541 /* -q[f][f][l][G<name>]... Work on the named queue */
3543 if (*argrest == 'G')
3546 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3547 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3548 queue_name = string_copyn(argrest, i);
3550 if (*argrest == '/') argrest++;
3553 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3554 only, optionally named, optionally starting from a given message id. */
3556 if (!(list_queue || count_queue))
3558 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3561 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3562 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3563 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3564 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3567 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3568 forced, optionally local only, optionally named. */
3570 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3572 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3576 case 'R': /* Synonymous with -qR... */
3578 const uschar *tainted_selectstr;
3580 receiving_message = FALSE;
3582 /* -Rf: As -R (below) but force all deliveries,
3583 -Rff: Ditto, but also thaw all frozen messages,
3584 -Rr: String is regex
3585 -Rrf: Regex and force
3586 -Rrff: Regex and force and thaw
3588 in all cases provided there are no further characters in this
3592 for (int i = 0; i < nelem(rsopts); i++)
3593 if (Ustrcmp(argrest, rsopts[i]) == 0)
3595 if (i != 2) f.queue_run_force = TRUE;
3596 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3597 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3598 argrest += Ustrlen(rsopts[i]);
3601 /* -R: Set string to match in addresses for forced queue run to
3602 pick out particular messages. */
3604 /* Avoid attacks from people providing very long strings, and do so before
3607 tainted_selectstr = argrest;
3608 else if (i+1 < argc)
3609 tainted_selectstr = argv[++i];
3611 exim_fail("exim: string expected after -R\n");
3612 deliver_selectstring = string_copy_taint(
3613 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3618 /* -r: an obsolete synonym for -f (see above) */
3621 /* -S: Like -R but works on sender. */
3623 case 'S': /* Synonymous with -qS... */
3625 const uschar *tainted_selectstr;
3627 receiving_message = FALSE;
3629 /* -Sf: As -S (below) but force all deliveries,
3630 -Sff: Ditto, but also thaw all frozen messages,
3631 -Sr: String is regex
3632 -Srf: Regex and force
3633 -Srff: Regex and force and thaw
3635 in all cases provided there are no further characters in this
3639 for (int i = 0; i < nelem(rsopts); i++)
3640 if (Ustrcmp(argrest, rsopts[i]) == 0)
3642 if (i != 2) f.queue_run_force = TRUE;
3643 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3644 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3645 argrest += Ustrlen(rsopts[i]);
3648 /* -S: Set string to match in addresses for forced queue run to
3649 pick out particular messages. */
3652 tainted_selectstr = argrest;
3653 else if (i+1 < argc)
3654 tainted_selectstr = argv[++i];
3656 exim_fail("exim: string expected after -S\n");
3657 deliver_selectstring_sender = string_copy_taint(
3658 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3663 /* -Tqt is an option that is exclusively for use by the testing suite.
3664 It is not recognized in other circumstances. It allows for the setting up
3665 of explicit "queue times" so that various warning/retry things can be
3666 tested. Otherwise variability of clock ticks etc. cause problems. */
3669 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3670 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3675 /* -t: Set flag to extract recipients from body of message. */
3678 if (!*argrest) extract_recipients = TRUE;
3680 /* -ti: Set flag to extract recipients from body of message, and also
3681 specify that dot does not end the message. */
3683 else if (Ustrcmp(argrest, "i") == 0)
3685 extract_recipients = TRUE;
3689 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3692 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3699 /* -U: This means "initial user submission" in sendmail, apparently. The
3700 doc claims that in future sendmail may refuse syntactically invalid
3701 messages instead of fixing them. For the moment, we just ignore it. */
3707 /* -v: verify things - this is a very low-level debugging */
3712 debug_selector |= D_v;
3713 debug_file = stderr;
3719 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3721 The -x flag tells the sendmail command that mail from a local
3722 mail program has National Language Support (NLS) extended characters
3723 in the body of the mail item. The sendmail command can send mail with
3724 extended NLS characters across networks that normally corrupts these
3727 As Exim is 8-bit clean, it just ignores this flag. */
3730 if (*argrest) badarg = TRUE;
3733 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3734 logs to that file. We swallow the parameter and otherwise ignore it. */
3739 exim_fail("exim: string expected after -X\n");
3742 /* -z: a line of text to log */
3747 log_oneline = string_copy_taint(
3748 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3751 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3754 /* All other initial characters are errors */
3759 } /* End of high-level switch statement */
3761 /* Failed to recognize the option, or syntax error */
3764 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3765 "option %s\n", arg);
3769 /* If -R or -S have been specified without -q, assume a single queue run. */
3771 if ( (deliver_selectstring || deliver_selectstring_sender)
3772 && queue_interval < 0)
3777 store_pool = old_pool;
3780 /* If usage_wanted is set we call the usage function - which never returns */
3781 if (usage_wanted) exim_usage(called_as);
3783 /* Arguments have been processed. Check for incompatibilities. */
3784 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3785 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3786 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3787 || filter_test != FTEST_NONE
3788 || msg_action_arg > 0 && !one_msg_action
3790 || ( msg_action_arg > 0
3791 && ( f.daemon_listen || queue_interval > 0 || list_options
3792 || checking && msg_action != MSG_LOAD
3793 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3795 || ( (f.daemon_listen || queue_interval > 0)
3796 && ( sender_address || list_options || list_queue || checking
3799 || f.daemon_listen && queue_interval == 0
3800 || f.inetd_wait_mode && queue_interval >= 0
3802 && ( checking || smtp_input || extract_recipients
3803 || filter_test != FTEST_NONE || bi_option
3805 || ( verify_address_mode
3806 && ( f.address_test_mode || smtp_input || extract_recipients
3807 || filter_test != FTEST_NONE || bi_option
3809 || ( f.address_test_mode
3810 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3814 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3816 || deliver_selectstring && queue_interval < 0
3817 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3819 exim_fail("exim: incompatible command-line options or arguments\n");
3821 /* If debugging is set up, set the file and the file descriptor to pass on to
3822 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3823 to run in the foreground. */
3825 if (debug_selector != 0)
3827 debug_file = stderr;
3828 debug_fd = fileno(debug_file);
3829 f.background_daemon = FALSE;
3830 testharness_pause_ms(100); /* lets caller finish */
3831 if (debug_selector != D_v) /* -v only doesn't show this */
3833 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3834 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3836 if (!version_printed)
3837 show_whats_supported(FALSE);
3841 /* When started with root privilege, ensure that the limits on the number of
3842 open files and the number of processes (where that is accessible) are
3843 sufficiently large, or are unset, in case Exim has been called from an
3844 environment where the limits are screwed down. Not all OS have the ability to
3845 change some of these limits. */
3849 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3855 #ifdef RLIMIT_NOFILE
3856 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3858 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3860 rlp.rlim_cur = rlp.rlim_max = 0;
3863 /* I originally chose 1000 as a nice big number that was unlikely to
3864 be exceeded. It turns out that some older OS have a fixed upper limit of
3867 if (rlp.rlim_cur < 1000)
3869 rlp.rlim_cur = rlp.rlim_max = 1000;
3870 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3872 rlp.rlim_cur = rlp.rlim_max = 256;
3873 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3874 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3881 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3883 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3885 rlp.rlim_cur = rlp.rlim_max = 0;
3888 # ifdef RLIM_INFINITY
3889 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3891 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3893 if (rlp.rlim_cur < 1000)
3895 rlp.rlim_cur = rlp.rlim_max = 1000;
3897 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3898 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3904 /* Exim is normally entered as root (but some special configurations are
3905 possible that don't do this). However, it always spins off sub-processes that
3906 set their uid and gid as required for local delivery. We don't want to pass on
3907 any extra groups that root may belong to, so we want to get rid of them all at
3910 We need to obey setgroups() at this stage, before possibly giving up root
3911 privilege for a changed configuration file, but later on we might need to
3912 check on the additional groups for the admin user privilege - can't do that
3913 till after reading the config, which might specify the exim gid. Therefore,
3914 save the group list here first. */
3916 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3917 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3919 /* There is a fundamental difference in some BSD systems in the matter of
3920 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3921 known not to be different. On the "different" systems there is a single group
3922 list, and the first entry in it is the current group. On all other versions of
3923 Unix there is a supplementary group list, which is in *addition* to the current
3924 group. Consequently, to get rid of all extraneous groups on a "standard" system
3925 you pass over 0 groups to setgroups(), while on a "different" system you pass
3926 over a single group - the current group, which is always the first group in the
3927 list. Calling setgroups() with zero groups on a "different" system results in
3928 an error return. The following code should cope with both types of system.
3930 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3931 the "setgroups() with zero groups" - and changes the egid.
3932 Thanks to that we had to stash the original_egid above, for use below
3933 in the call to exim_setugid().
3935 However, if this process isn't running as root, setgroups() can't be used
3936 since you have to be root to run it, even if throwing away groups.
3937 Except, sigh, for Hurd - where you can.
3938 Not being root here happens only in some unusual configurations. */
3941 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3942 && setgroups(0, NULL) != 0
3944 && setgroups(1, group_list) != 0)
3945 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3947 /* If the configuration file name has been altered by an argument on the
3948 command line (either a new file name or a macro definition) and the caller is
3949 not root, or if this is a filter testing run, remove any setuid privilege the
3950 program has and run as the underlying user.
3952 The exim user is locked out of this, which severely restricts the use of -C
3955 Otherwise, set the real ids to the effective values (should be root unless run
3956 from inetd, which it can either be root or the exim uid, if one is configured).
3958 There is a private mechanism for bypassing some of this, in order to make it
3959 possible to test lots of configurations automatically, without having either to
3960 recompile each time, or to patch in an actual configuration file name and other
3961 values (such as the path name). If running in the test harness, pretend that
3962 configuration file changes and macro definitions haven't happened. */
3965 (!f.trusted_config || /* Config changed, or */
3966 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3967 real_uid != root_uid && /* Not root, and */
3968 !f.running_in_test_harness /* Not fudged */
3970 expansion_test /* expansion testing */
3972 filter_test != FTEST_NONE) /* Filter testing */
3974 setgroups(group_count, group_list);
3975 exim_setugid(real_uid, real_gid, FALSE,
3976 US"-C, -D, -be or -bf forces real uid");
3977 removed_privilege = TRUE;
3979 /* In the normal case when Exim is called like this, stderr is available
3980 and should be used for any logging information because attempts to write
3981 to the log will usually fail. To arrange this, we unset really_exim. However,
3982 if no stderr is available there is no point - we might as well have a go
3983 at the log (if it fails, syslog will be written).
3985 Note that if the invoker is Exim, the logs remain available. Messing with
3986 this causes unlogged successful deliveries. */
3988 if (log_stderr && real_uid != exim_uid)
3989 f.really_exim = FALSE;
3992 /* Privilege is to be retained for the moment. It may be dropped later,
3993 depending on the job that this Exim process has been asked to do. For now, set
3994 the real uid to the effective so that subsequent re-execs of Exim are done by a
3998 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4000 /* If testing a filter, open the file(s) now, before wasting time doing other
4001 setups and reading the message. */
4003 if (filter_test & FTEST_SYSTEM)
4004 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4005 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4008 if (filter_test & FTEST_USER)
4009 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4010 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4013 /* Initialise lookup_list
4014 If debugging, already called above via version reporting.
4015 In either case, we initialise the list of available lookups while running
4016 as root. All dynamically modules are loaded from a directory which is
4017 hard-coded into the binary and is code which, if not a module, would be
4018 part of Exim already. Ability to modify the content of the directory
4019 is equivalent to the ability to modify a setuid binary!
4021 This needs to happen before we read the main configuration. */
4024 /*XXX this excrescence could move to the testsuite standard config setup file */
4026 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4029 /* Read the main runtime configuration data; this gives up if there
4030 is a failure. It leaves the configuration file open so that the subsequent
4031 configuration data for delivery can be read if needed.
4033 NOTE: immediately after opening the configuration file we change the working
4034 directory to "/"! Later we change to $spool_directory. We do it there, because
4035 during readconf_main() some expansion takes place already. */
4037 /* Store the initial cwd before we change directories. Can be NULL if the
4038 dir has already been unlinked. */
4039 initial_cwd = os_getcwd(NULL, 0);
4040 if (!initial_cwd && errno)
4041 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4043 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4044 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4047 -be[m] expansion test -
4048 -b[fF] filter test new
4050 -bmalware malware_test_file new
4052 -brw rewrite test new
4054 -bv[s] address verify -
4056 -bP <option> (except -bP config, which sets list_config)
4058 If any of these options is set, we suppress warnings about configuration
4059 issues (currently about tls_advertise_hosts and keep_environment not being
4063 int old_pool = store_pool;
4064 #ifdef MEASURE_TIMING
4066 (void)gettimeofday(&t0, NULL);
4069 store_pool = POOL_CONFIG;
4070 readconf_main(checking || list_options);
4071 store_pool = old_pool;
4073 #ifdef MEASURE_TIMING
4074 report_time_since(&t0, US"readconf_main (delta)");
4078 /* Now in directory "/" */
4080 if (cleanup_environment() == FALSE)
4081 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4084 /* If an action on specific messages is requested, or if a daemon or queue
4085 runner is being started, we need to know if Exim was called by an admin user.
4086 This is the case if the real user is root or exim, or if the real group is
4087 exim, or if one of the supplementary groups is exim or a group listed in
4088 admin_groups. We don't fail all message actions immediately if not admin_user,
4089 since some actions can be performed by non-admin users. Instead, set admin_user
4090 for later interrogation. */
4092 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4093 f.admin_user = TRUE;
4095 for (int i = 0; i < group_count && !f.admin_user; i++)
4096 if (group_list[i] == exim_gid)
4097 f.admin_user = TRUE;
4098 else if (admin_groups)
4099 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4100 if (admin_groups[j] == group_list[i])
4101 f.admin_user = TRUE;
4103 /* Another group of privileged users are the trusted users. These are root,
4104 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4105 are permitted to specify sender_addresses with -f on the command line, and
4106 other message parameters as well. */
4108 if (real_uid == root_uid || real_uid == exim_uid)
4109 f.trusted_caller = TRUE;
4113 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4114 if (trusted_users[i] == real_uid)
4115 f.trusted_caller = TRUE;
4118 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4119 if (trusted_groups[i] == real_gid)
4120 f.trusted_caller = TRUE;
4121 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4122 if (trusted_groups[i] == group_list[j])
4123 f.trusted_caller = TRUE;
4126 /* At this point, we know if the user is privileged and some command-line
4127 options become possibly impermissible, depending upon the configuration file. */
4129 if (checking && commandline_checks_require_admin && !f.admin_user)
4130 exim_fail("exim: those command-line flags are set to require admin\n");
4132 /* Handle the decoding of logging options. */
4134 decode_bits(log_selector, log_selector_size, log_notall,
4135 log_selector_string, log_options, log_options_count, US"log", 0);
4139 debug_printf("configuration file is %s\n", config_main_filename);
4140 debug_printf("log selectors =");
4141 for (int i = 0; i < log_selector_size; i++)
4142 debug_printf(" %08x", log_selector[i]);
4146 /* If domain literals are not allowed, check the sender address that was
4147 supplied with -f. Ditto for a stripped trailing dot. */
4151 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4152 exim_fail("exim: bad -f address \"%s\": domain literals not "
4153 "allowed\n", sender_address);
4154 if (f_end_dot && !strip_trailing_dot)
4155 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4156 "(trailing dot not allowed)\n", sender_address);
4159 /* See if an admin user overrode our logging. */
4161 if (cmdline_syslog_name)
4164 syslog_processname = cmdline_syslog_name;
4165 log_file_path = string_copy(CUS"syslog");
4168 /* not a panic, non-privileged users should not be able to spam paniclog */
4170 "exim: you lack sufficient privilege to specify syslog process name\n");
4172 /* Paranoia check of maximum lengths of certain strings. There is a check
4173 on the length of the log file path in log.c, which will come into effect
4174 if there are any calls to write the log earlier than this. However, if we
4175 get this far but the string is very long, it is better to stop now than to
4176 carry on and (e.g.) receive a message and then have to collapse. The call to
4177 log_write() from here will cause the ultimate panic collapse if the complete
4178 file name exceeds the buffer length. */
4180 if (Ustrlen(log_file_path) > 200)
4181 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4182 "log_file_path is longer than 200 chars: aborting");
4184 if (Ustrlen(pid_file_path) > 200)
4185 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4186 "pid_file_path is longer than 200 chars: aborting");
4188 if (Ustrlen(spool_directory) > 200)
4189 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4190 "spool_directory is longer than 200 chars: aborting");
4192 /* Length check on the process name given to syslog for its TAG field,
4193 which is only permitted to be 32 characters or less. See RFC 3164. */
4195 if (Ustrlen(syslog_processname) > 32)
4196 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4197 "syslog_processname is longer than 32 chars: aborting");
4202 log_write(0, LOG_MAIN, "%s", log_oneline);
4203 return EXIT_SUCCESS;
4206 return EXIT_FAILURE;
4208 /* In some operating systems, the environment variable TMPDIR controls where
4209 temporary files are created; Exim doesn't use these (apart from when delivering
4210 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4211 If TMPDIR is found in the environment, reset it to the value defined in the
4212 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4213 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4214 EXIM_TMPDIR by the build scripts.
4218 if (environ) for (uschar ** p = USS environ; *p; p++)
4219 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4221 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4222 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4224 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4228 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4229 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4230 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4231 called by a user who has set the TZ variable. This then affects the timestamps
4232 in log files and in Received: headers, and any created Date: header lines. The
4233 required timezone is settable in the configuration file, so nothing can be done
4234 about this earlier - but hopefully nothing will normally be logged earlier than
4235 this. We have to make a new environment if TZ is wrong, but don't bother if
4236 timestamps_utc is set, because then all times are in UTC anyway. */
4238 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4239 f.timestamps_utc = TRUE;
4242 uschar *envtz = US getenv("TZ");
4244 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4245 : timezone_string != NULL
4248 uschar **p = USS environ;
4252 if (environ) while (*p++) count++;
4253 if (!envtz) count++;
4254 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4255 if (environ) for (p = USS environ; *p; p++)
4256 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4257 if (timezone_string)
4259 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4260 sprintf(CS *newp++, "TZ=%s", timezone_string);
4265 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4266 tod_stamp(tod_log));
4270 /* Handle the case when we have removed the setuid privilege because of -C or
4271 -D. This means that the caller of Exim was not root.
4273 There is a problem if we were running as the Exim user. The sysadmin may
4274 expect this case to retain privilege because "the binary was called by the
4275 Exim user", but it hasn't, because either the -D option set macros, or the
4276 -C option set a non-trusted configuration file. There are two possibilities:
4278 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4279 to do message deliveries. Thus, the fact that it is running as a
4280 non-privileged user is plausible, and might be wanted in some special
4281 configurations. However, really_exim will have been set false when
4282 privilege was dropped, to stop Exim trying to write to its normal log
4283 files. Therefore, re-enable normal log processing, assuming the sysadmin
4284 has set up the log directory correctly.
4286 (2) If deliver_drop_privilege is not set, the configuration won't work as
4287 apparently intended, and so we log a panic message. In order to retain
4288 root for -C or -D, the caller must either be root or be invoking a
4289 trusted configuration file (when deliver_drop_privilege is false). */
4291 if ( removed_privilege
4292 && (!f.trusted_config || opt_D_used)
4293 && real_uid == exim_uid)
4294 if (deliver_drop_privilege)
4295 f.really_exim = TRUE; /* let logging work normally */
4297 log_write(0, LOG_MAIN|LOG_PANIC,
4298 "exim user lost privilege for using %s option",
4299 f.trusted_config? "-D" : "-C");
4301 /* Start up Perl interpreter if Perl support is configured and there is a
4302 perl_startup option, and the configuration or the command line specifies
4303 initializing starting. Note that the global variables are actually called
4304 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4307 if (perl_start_option != 0)
4308 opt_perl_at_start = (perl_start_option > 0);
4309 if (opt_perl_at_start && opt_perl_startup != NULL)
4312 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4313 if ((errstr = init_perl(opt_perl_startup)))
4314 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4315 opt_perl_started = TRUE;
4317 #endif /* EXIM_PERL */
4319 /* Log the arguments of the call if the configuration file said so. This is
4320 a debugging feature for finding out what arguments certain MUAs actually use.
4321 Don't attempt it if logging is disabled, or if listing variables or if
4322 verifying/testing addresses or expansions. */
4324 if ( (debug_selector & D_any || LOGGING(arguments))
4325 && f.really_exim && !list_options && !checking)
4327 uschar *p = big_buffer;
4328 Ustrcpy(p, US"cwd= (failed)");
4335 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4336 p += Ustrlen(CCS p);
4339 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4341 for (int i = 0; i < argc; i++)
4343 int len = Ustrlen(argv[i]);
4344 const uschar *printing;
4346 if (p + len + 8 >= big_buffer + big_buffer_size)
4348 Ustrcpy(p, US" ...");
4349 log_write(0, LOG_MAIN, "%s", big_buffer);
4350 Ustrcpy(big_buffer, US"...");
4353 printing = string_printing(argv[i]);
4354 if (!*printing) quote = US"\"";
4357 const uschar *pp = printing;
4359 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4361 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4362 (p - big_buffer) - 4), printing, quote);
4365 if (LOGGING(arguments))
4366 log_write(0, LOG_MAIN, "%s", big_buffer);
4368 debug_printf("%s\n", big_buffer);
4371 /* Set the working directory to be the top-level spool directory. We don't rely
4372 on this in the code, which always uses fully qualified names, but it's useful
4373 for core dumps etc. Don't complain if it fails - the spool directory might not
4374 be generally accessible and calls with the -C option (and others) have lost
4375 privilege by now. Before the chdir, we try to ensure that the directory exists.
4378 if (Uchdir(spool_directory) != 0)
4380 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4381 (void) Uchdir(spool_directory);
4384 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4385 alias file. Exim doesn't have such a concept, but this call is screwed into
4386 Sun's YP makefiles. Handle this by calling a configured script, as the real
4387 user who called Exim. The -oA option can be used to pass an argument to the
4392 (void) fclose(config_file);
4393 if (bi_command && *bi_command)
4397 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4398 if (alias_arg) argv[i++] = alias_arg;
4401 setgroups(group_count, group_list);
4402 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4404 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4405 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4407 execv(CS argv[0], (char *const *)argv);
4408 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4412 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4417 /* We moved the admin/trusted check to be immediately after reading the
4418 configuration file. We leave these prints here to ensure that syslog setup,
4419 logfile setup, and so on has already happened. */
4421 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4422 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4424 /* Only an admin user may start the daemon or force a queue run in the default
4425 configuration, but the queue run restriction can be relaxed. Only an admin
4426 user may request that a message be returned to its sender forthwith. Only an
4427 admin user may specify a debug level greater than D_v (because it might show
4428 passwords, etc. in lookup queries). Only an admin user may request a queue
4429 count. Only an admin user can use the test interface to scan for email
4430 (because Exim will be in the spool dir and able to look at mails). */
4434 BOOL debugset = (debug_selector & ~D_v) != 0;
4435 if ( deliver_give_up || f.daemon_listen || malware_test_file
4436 || count_queue && queue_list_requires_admin
4437 || list_queue && queue_list_requires_admin
4438 || queue_interval >= 0 && prod_requires_admin
4439 || queue_name_dest && prod_requires_admin
4440 || debugset && !f.running_in_test_harness
4442 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4445 /* If the real user is not root or the exim uid, the argument for passing
4446 in an open TCP/IP connection for another message is not permitted, nor is
4447 running with the -N option for any delivery action, unless this call to exim is
4448 one that supplied an input message, or we are using a patched exim for
4449 regression testing. */
4451 if ( real_uid != root_uid && real_uid != exim_uid
4452 && ( continue_hostname
4454 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4456 && !f.running_in_test_harness
4458 exim_fail("exim: Permission denied\n");
4460 /* If the caller is not trusted, certain arguments are ignored when running for
4461 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4462 Note that authority for performing certain actions on messages is tested in the
4463 queue_action() function. */
4465 if (!f.trusted_caller && !checking)
4467 sender_host_name = sender_host_address = interface_address =
4468 sender_ident = received_protocol = NULL;
4469 sender_host_port = interface_port = 0;
4470 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4473 /* If a sender host address is set, extract the optional port number off the
4474 end of it and check its syntax. Do the same thing for the interface address.
4475 Exim exits if the syntax is bad. */
4479 if (sender_host_address)
4480 sender_host_port = check_port(sender_host_address);
4481 if (interface_address)
4482 interface_port = check_port(interface_address);
4485 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4488 if (f.trusted_caller)
4490 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4491 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4494 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4497 /* If an SMTP message is being received check to see if the standard input is a
4498 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4499 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4504 union sockaddr_46 inetd_sock;
4505 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4506 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4508 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4509 if (family == AF_INET || family == AF_INET6)
4511 union sockaddr_46 interface_sock;
4512 size = sizeof(interface_sock);
4514 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4515 interface_address = host_ntoa(-1, &interface_sock, NULL,
4518 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4520 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4523 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4524 NULL, &sender_host_port);
4525 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4526 "inetd is not supported when mua_wrapper is set");
4530 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4535 /* If the load average is going to be needed while receiving a message, get it
4536 now for those OS that require the first call to os_getloadavg() to be done as
4537 root. There will be further calls later for each message received. */
4539 #ifdef LOAD_AVG_NEEDS_ROOT
4540 if ( receiving_message
4541 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4542 load_average = OS_GETLOADAVG();
4545 /* The queue_only configuration option can be overridden by -odx on the command
4546 line, except that if queue_only_override is false, queue_only cannot be unset
4547 from the command line. */
4549 if (queue_only_set && (queue_only_override || arg_queue_only))
4550 queue_only = arg_queue_only;
4552 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4555 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4556 if (arg_smtp_receive_timeout >= 0)
4557 smtp_receive_timeout = arg_smtp_receive_timeout;
4559 /* If Exim was started with root privilege, unless we have already removed the
4560 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4561 except when starting the daemon or doing some kind of delivery or address
4562 testing (-bt). These are the only cases when root need to be retained. We run
4563 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4564 retained only for starting the daemon. We always do the initgroups() in this
4565 situation (controlled by the TRUE below), in order to be as close as possible
4566 to the state Exim usually runs in. */
4568 if ( !unprivileged /* originally had root AND */
4569 && !removed_privilege /* still got root AND */
4570 && !f.daemon_listen /* not starting the daemon */
4571 && queue_interval <= 0 /* (either kind of daemon) */
4572 && ( /* AND EITHER */
4573 deliver_drop_privilege /* requested unprivileged */
4575 queue_interval < 0 /* not running the queue */
4576 && ( msg_action_arg < 0 /* and */
4577 || msg_action != MSG_DELIVER /* not delivering */
4579 && (!checking || !f.address_test_mode) /* not address checking */
4580 && !rcpt_verify_quota /* and not quota checking */
4582 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4584 /* When we are retaining a privileged uid, we still change to the exim gid. */
4589 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4590 rv = setgid(exim_gid);
4591 /* Impact of failure is that some stuff might end up with an incorrect group.
4592 We track this for failures from root, since any attempt to change privilege
4593 by root should succeed and failures should be examined. For non-root,
4594 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4595 no need to complain then. */
4597 if (!(unprivileged || removed_privilege))
4598 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4601 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4602 (long int)exim_gid, strerror(errno));
4606 /* Handle a request to scan a file for malware */
4607 if (malware_test_file)
4609 #ifdef WITH_CONTENT_SCAN
4611 set_process_info("scanning file for malware");
4612 if ((result = malware_in_file(malware_test_file)) == FAIL)
4614 printf("No malware found.\n");
4619 printf("Malware lookup returned non-okay/fail: %d\n", result);
4623 printf("Malware found: %s\n", malware_name);
4625 printf("Malware scan detected malware of unknown name.\n");
4627 printf("Malware scanning not enabled at compile time.\n");
4632 /* Handle a request to list the delivery queue */
4636 set_process_info("listing the queue");
4637 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4641 /* Handle a request to count the delivery queue */
4645 set_process_info("counting the queue");
4646 fprintf(stdout, "%u\n", queue_count());
4650 /* Handle actions on specific messages, except for the force delivery and
4651 message load actions, which are done below. Some actions take a whole list of
4652 message ids, which are known to continue up to the end of the arguments. Others
4653 take a single message id and then operate on the recipients list. */
4655 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4657 int yield = EXIT_SUCCESS;
4658 set_process_info("acting on specified messages");
4660 /* ACL definitions may be needed when removing a message (-Mrm) because
4661 event_action gets expanded */
4663 if (msg_action == MSG_REMOVE)
4665 int old_pool = store_pool;
4666 store_pool = POOL_CONFIG;
4668 store_pool = old_pool;
4669 store_writeprotect(POOL_CONFIG);
4672 if (!one_msg_action)
4674 for (i = msg_action_arg; i < argc; i++)
4675 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4676 yield = EXIT_FAILURE;
4679 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4680 default: printf("\n"); break;
4684 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4685 recipients_arg)) yield = EXIT_FAILURE;
4689 /* We used to set up here to skip reading the ACL section, on
4690 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4691 Now, since the intro of the ${acl } expansion, ACL definitions may be
4692 needed in transports so we lost the optimisation. */
4695 int old_pool = store_pool;
4696 #ifdef MEASURE_TIMING
4698 (void)gettimeofday(&t0, NULL);
4701 store_pool = POOL_CONFIG;
4703 store_pool = old_pool;
4705 /* -be can add macro definitions, needing to link to the macro structure
4706 chain. Otherwise, make the memory used for config data readonly. */
4708 if (!expansion_test)
4709 store_writeprotect(POOL_CONFIG);
4711 #ifdef MEASURE_TIMING
4712 report_time_since(&t0, US"readconf_rest (delta)");
4716 /* Handle a request to check quota */
4717 if (rcpt_verify_quota)
4718 if (real_uid != root_uid && real_uid != exim_uid)
4719 exim_fail("exim: Permission denied\n");
4720 else if (recipients_arg >= argc)
4721 exim_fail("exim: missing recipient for quota check\n");
4724 verify_quota(argv[recipients_arg]);
4725 exim_exit(EXIT_SUCCESS);
4728 /* Handle the -brt option. This is for checking out retry configurations.
4729 The next three arguments are a domain name or a complete address, and
4730 optionally two error numbers. All it does is to call the function that
4731 scans the retry configuration data. */
4733 if (test_retry_arg >= 0)
4735 retry_config *yield;
4736 int basic_errno = 0;
4738 const uschar *s1, *s2;
4740 if (test_retry_arg >= argc)
4742 printf("-brt needs a domain or address argument\n");
4743 exim_exit(EXIT_FAILURE);
4745 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4748 /* If the first argument contains no @ and no . it might be a local user
4749 or it might be a single-component name. Treat as a domain. */
4751 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4753 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4754 "being \ntreated as a one-component domain, not as a local part.\n\n",
4758 /* There may be an optional second domain arg. */
4760 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4761 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4763 /* The final arg is an error name */
4765 if (test_retry_arg < argc)
4767 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4769 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4772 printf("%s\n", CS error);
4773 return EXIT_FAILURE;
4776 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4777 code > 100 as an error is for matching codes to the decade. Turn them into
4778 a real error code, off the decade. */
4780 if (basic_errno == ERRNO_MAIL4XX ||
4781 basic_errno == ERRNO_RCPT4XX ||
4782 basic_errno == ERRNO_DATA4XX)
4784 int code = (more_errno >> 8) & 255;
4786 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4787 else if (code > 100)
4788 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4792 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4793 printf("No retry information found\n");
4796 more_errno = yield->more_errno;
4797 printf("Retry rule: %s ", yield->pattern);
4799 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4801 printf("quota%s%s ",
4802 (more_errno > 0)? "_" : "",
4803 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4805 else if (yield->basic_errno == ECONNREFUSED)
4807 printf("refused%s%s ",
4808 (more_errno > 0)? "_" : "",
4809 (more_errno == 'M')? "MX" :
4810 (more_errno == 'A')? "A" : "");
4812 else if (yield->basic_errno == ETIMEDOUT)
4815 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4817 if (more_errno != 0) printf("_%s",
4818 (more_errno == 'M')? "MX" : "A");
4821 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4822 printf("auth_failed ");
4825 for (retry_rule * r = yield->rules; r; r = r->next)
4827 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4828 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4834 printf(",%d.", x/1000);
4848 exim_exit(EXIT_SUCCESS);
4851 /* Handle a request to list one or more configuration options */
4852 /* If -n was set, we suppress some information */
4857 set_process_info("listing variables");
4858 if (recipients_arg >= argc)
4859 fail = !readconf_print(US"all", NULL, flag_n);
4860 else for (i = recipients_arg; i < argc; i++)
4863 (Ustrcmp(argv[i], "router") == 0 ||
4864 Ustrcmp(argv[i], "transport") == 0 ||
4865 Ustrcmp(argv[i], "authenticator") == 0 ||
4866 Ustrcmp(argv[i], "macro") == 0 ||
4867 Ustrcmp(argv[i], "environment") == 0))
4869 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4873 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4875 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4880 set_process_info("listing config");
4881 exim_exit(readconf_print(US"config", NULL, flag_n)
4882 ? EXIT_SUCCESS : EXIT_FAILURE);
4886 /* Initialise subsystems as required. */
4890 /* Handle a request to deliver one or more messages that are already on the
4891 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4892 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4894 Delivery of specific messages is typically used for a small number when
4895 prodding by hand (when the option forced_delivery will be set) or when
4896 re-execing to regain root privilege. Each message delivery must happen in a
4897 separate process, so we fork a process for each one, and run them sequentially
4898 so that debugging output doesn't get intertwined, and to avoid spawning too
4899 many processes if a long list is given. However, don't fork for the last one;
4900 this saves a process in the common case when Exim is called to deliver just one
4903 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4905 if (prod_requires_admin && !f.admin_user)
4907 fprintf(stderr, "exim: Permission denied\n");
4908 exim_exit(EXIT_FAILURE);
4910 set_process_info("delivering specified messages");
4911 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4912 for (i = msg_action_arg; i < argc; i++)
4916 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4917 that runs into a later copy into the untainted global message_id[] */
4918 /*XXX Do we need a length limit check here? */
4920 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4921 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4923 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4924 exim_underbar_exit(EXIT_SUCCESS);
4928 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4930 exim_exit(EXIT_FAILURE);
4934 exim_exit(EXIT_SUCCESS);
4938 /* If only a single queue run is requested, without SMTP listening, we can just
4939 turn into a queue runner, with an optional starting message id. */
4941 if (queue_interval == 0 && !f.daemon_listen)
4943 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4944 start_queue_run_id ? US" starting at " : US"",
4945 start_queue_run_id ? start_queue_run_id: US"",
4946 stop_queue_run_id ? US" stopping at " : US"",
4947 stop_queue_run_id ? stop_queue_run_id : US"");
4949 set_process_info("running the '%s' queue (single queue run)", queue_name);
4951 set_process_info("running the queue (single queue run)");
4952 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4953 exim_exit(EXIT_SUCCESS);
4957 /* Find the login name of the real user running this process. This is always
4958 needed when receiving a message, because it is written into the spool file. It
4959 may also be used to construct a from: or a sender: header, and in this case we
4960 need the user's full name as well, so save a copy of it, checked for RFC822
4961 syntax and munged if necessary, if it hasn't previously been set by the -F
4962 argument. We may try to get the passwd entry more than once, in case NIS or
4963 other delays are in evidence. Save the home directory for use in filter testing
4968 if ((pw = getpwuid(real_uid)) != NULL)
4970 originator_login = string_copy(US pw->pw_name);
4971 originator_home = string_copy(US pw->pw_dir);
4973 /* If user name has not been set by -F, set it from the passwd entry
4974 unless -f has been used to set the sender address by a trusted user. */
4976 if (!originator_name)
4978 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4980 uschar *name = US pw->pw_gecos;
4981 uschar *amp = Ustrchr(name, '&');
4984 /* Most Unix specify that a '&' character in the gecos field is
4985 replaced by a copy of the login name, and some even specify that
4986 the first character should be upper cased, so that's what we do. */
4991 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4992 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4993 buffer[loffset] = toupper(buffer[loffset]);
4997 /* If a pattern for matching the gecos field was supplied, apply
4998 it and then expand the name string. */
5000 if (gecos_pattern && gecos_name)
5002 const pcre2_code *re;
5003 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5005 if (regex_match_and_setup(re, name, 0, -1))
5007 uschar *new_name = expand_string(gecos_name);
5011 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5012 "gecos field \"%s\"\n", new_name, name);
5015 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5016 "\"%s\": %s\n", gecos_name, expand_string_message);
5018 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5019 "gecos field \"%s\"\n", gecos_pattern, name);
5020 store_free((void *)re);
5022 originator_name = string_copy(name);
5025 /* A trusted caller has used -f but not -F */
5027 else originator_name = US"";
5030 /* Break the retry loop */
5035 if (++i > finduser_retries) break;
5039 /* If we cannot get a user login, log the incident and give up, unless the
5040 configuration specifies something to use. When running in the test harness,
5041 any setting of unknown_login overrides the actual name. */
5043 if (!originator_login || f.running_in_test_harness)
5047 originator_login = expand_string(unknown_login);
5048 if (!originator_name && unknown_username)
5049 originator_name = expand_string(unknown_username);
5050 if (!originator_name) originator_name = US"";
5052 if (!originator_login)
5053 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5057 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5060 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5062 /* If a message is created by this call of Exim, the uid/gid of its originator
5063 are those of the caller. These values are overridden if an existing message is
5064 read in from the spool. */
5066 originator_uid = real_uid;
5067 originator_gid = real_gid;
5069 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5070 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5072 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5073 returns. We leave this till here so that the originator_ fields are available
5074 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5077 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5081 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5082 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5083 "mua_wrapper is set");
5086 # ifndef DISABLE_TLS
5087 /* This also checks that the library linkage is working and we can call
5088 routines in it, so call even if tls_require_ciphers is unset */
5090 # ifdef MEASURE_TIMING
5092 (void)gettimeofday(&t0, NULL);
5094 if (!tls_dropprivs_validate_require_cipher(FALSE))
5096 # ifdef MEASURE_TIMING
5097 report_time_since(&t0, US"validate_ciphers (delta)");
5105 /* If the sender ident has not been set (by a trusted caller) set it to
5106 the caller. This will get overwritten below for an inetd call. If a trusted
5107 caller has set it empty, unset it. */
5109 if (!sender_ident) sender_ident = originator_login;
5110 else if (!*sender_ident) sender_ident = NULL;
5112 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5113 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5114 originator_* variables set. */
5116 if (test_rewrite_arg >= 0)
5118 f.really_exim = FALSE;
5119 if (test_rewrite_arg >= argc)
5121 printf("-brw needs an address argument\n");
5122 exim_exit(EXIT_FAILURE);
5124 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5125 exim_exit(EXIT_SUCCESS);
5128 /* A locally-supplied message is considered to be coming from a local user
5129 unless a trusted caller supplies a sender address with -f, or is passing in the
5130 message via SMTP (inetd invocation or otherwise). */
5132 if ( !sender_address && !smtp_input
5133 || !f.trusted_caller && filter_test == FTEST_NONE)
5135 f.sender_local = TRUE;
5137 /* A trusted caller can supply authenticated_sender and authenticated_id
5138 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5139 defaults except when host checking. */
5141 if (!authenticated_sender && !host_checking)
5142 authenticated_sender = string_sprintf("%s@%s", originator_login,
5143 qualify_domain_sender);
5144 if (!authenticated_id && !host_checking)
5145 authenticated_id = originator_login;
5148 /* Trusted callers are always permitted to specify the sender address.
5149 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5150 is specified is the empty address. However, if a trusted caller does not
5151 specify a sender address for SMTP input, we leave sender_address unset. This
5152 causes the MAIL commands to be honoured. */
5154 if ( !smtp_input && !sender_address
5155 || !receive_check_set_sender(sender_address))
5157 /* Either the caller is not permitted to set a general sender, or this is
5158 non-SMTP input and the trusted caller has not set a sender. If there is no
5159 sender, or if a sender other than <> is set, override with the originator's
5160 login (which will get qualified below), except when checking things. */
5162 if ( !sender_address /* No sender_address set */
5164 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5165 !checking)) /* Not running tests, including filter tests */
5167 sender_address = originator_login;
5168 f.sender_address_forced = FALSE;
5169 sender_address_domain = 0;
5173 /* Remember whether an untrusted caller set the sender address */
5175 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5177 /* Ensure that the sender address is fully qualified unless it is the empty
5178 address, which indicates an error message, or doesn't exist (root caller, smtp
5179 interface, no -f argument). */
5181 if (sender_address && *sender_address && sender_address_domain == 0)
5182 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5183 qualify_domain_sender);
5185 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5187 /* Handle a request to verify a list of addresses, or test them for delivery.
5188 This must follow the setting of the sender address, since routers can be
5189 predicated upon the sender. If no arguments are given, read addresses from
5190 stdin. Set debug_level to at least D_v to get full output for address testing.
5193 if (verify_address_mode || f.address_test_mode)
5196 int flags = vopt_qualify;
5198 if (verify_address_mode)
5200 if (!verify_as_sender) flags |= vopt_is_recipient;
5201 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5206 flags |= vopt_is_recipient;
5207 debug_selector |= D_v;
5208 debug_file = stderr;
5209 debug_fd = fileno(debug_file);
5210 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5213 if (recipients_arg < argc)
5214 while (recipients_arg < argc)
5216 /* Supplied addresses are tainted since they come from a user */
5217 uschar * s = string_copy_taint(
5218 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5222 BOOL finished = FALSE;
5223 uschar *ss = parse_find_address_end(s, FALSE);
5224 if (*ss == ',') *ss = 0; else finished = TRUE;
5225 test_address(s, flags, &exit_value);
5228 while (*++s == ',' || isspace(*s)) ;
5234 uschar * s = get_stdinput(NULL, NULL);
5236 test_address(string_copy_taint(
5237 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5239 flags, &exit_value);
5243 exim_exit(exit_value);
5246 /* Handle expansion checking. Either expand items on the command line, or read
5247 from stdin if there aren't any. If -Mset was specified, load the message so
5248 that its variables can be used, but restrict this facility to admin users.
5249 Otherwise, if -bem was used, read a message from stdin. */
5253 dns_init(FALSE, FALSE, FALSE);
5254 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5258 exim_fail("exim: permission denied\n");
5259 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5260 /* Checking the length of the ID is sufficient to validate it.
5261 Get an untainted version so file opens can be done. */
5262 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5264 spoolname = string_sprintf("%s-H", message_id);
5265 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5266 printf ("Failed to load message datafile %s\n", message_id);
5267 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5268 printf ("Failed to load message %s\n", message_id);
5271 /* Read a test message from a file. We fudge it up to be on stdin, saving
5272 stdin itself for later reading of expansion strings. */
5274 else if (expansion_test_message)
5276 int save_stdin = dup(0);
5277 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5279 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5282 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5283 message_ended = END_NOTENDED;
5284 read_message_body(receive_msg(extract_recipients));
5285 message_linecount += body_linecount;
5286 (void)dup2(save_stdin, 0);
5287 (void)close(save_stdin);
5288 clearerr(stdin); /* Required by Darwin */
5291 /* Only admin users may see config-file macros this way */
5293 if (!f.admin_user) macros_user = macros = mlast = NULL;
5295 /* Allow $recipients for this testing */
5297 f.enable_dollar_recipients = TRUE;
5299 /* Expand command line items */
5301 if (recipients_arg < argc)
5302 while (recipients_arg < argc)
5303 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5309 char *(*fn_readline)(const char *) = NULL;
5310 void (*fn_addhist)(const char *) = NULL;
5314 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5317 while (s = get_stdinput(fn_readline, fn_addhist))
5318 expansion_test_line(s);
5321 if (dlhandle) dlclose(dlhandle);
5325 /* The data file will be open after -Mset */
5327 if (deliver_datafile >= 0)
5329 (void)close(deliver_datafile);
5330 deliver_datafile = -1;
5333 exim_exit(EXIT_SUCCESS);
5337 /* The active host name is normally the primary host name, but it can be varied
5338 for hosts that want to play several parts at once. We need to ensure that it is
5339 set for host checking, and for receiving messages. */
5341 smtp_active_hostname = primary_hostname;
5342 if (raw_active_hostname != NULL)
5344 uschar *nah = expand_string(raw_active_hostname);
5347 if (!f.expand_string_forcedfail)
5348 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5349 "(smtp_active_hostname): %s", raw_active_hostname,
5350 expand_string_message);
5352 else if (nah[0] != 0) smtp_active_hostname = nah;
5355 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5356 given IP address so that the blocking and relay configuration can be tested.
5357 Unless a sender_ident was set by -oMt, we discard it (the default is the
5358 caller's login name). An RFC 1413 call is made only if we are running in the
5359 test harness and an incoming interface and both ports are specified, because
5360 there is no TCP/IP call to find the ident for. */
5367 if (!sender_ident_set)
5369 sender_ident = NULL;
5370 if (f.running_in_test_harness && sender_host_port
5371 && interface_address && interface_port)
5372 verify_get_ident(1223); /* note hardwired port number */
5375 /* In case the given address is a non-canonical IPv6 address, canonicalize
5376 it. The code works for both IPv4 and IPv6, as it happens. */
5378 size = host_aton(sender_host_address, x);
5379 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5380 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5382 /* Now set up for testing */
5384 host_build_sender_fullhost();
5388 f.sender_local = FALSE;
5389 f.sender_host_notsocket = TRUE;
5390 debug_file = stderr;
5391 debug_fd = fileno(debug_file);
5392 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5393 "**** but without any ident (RFC 1413) callback.\n"
5394 "**** This is not for real!\n\n",
5395 sender_host_address);
5397 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5398 if (verify_check_host(&hosts_connection_nolog) == OK)
5400 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5401 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5403 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5405 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5406 because a log line has already been written for all its failure exists
5407 (usually "connection refused: <reason>") and writing another one is
5408 unnecessary clutter. */
5410 if (smtp_start_session())
5413 for (; (reset_point = store_mark()); store_reset(reset_point))
5415 if (smtp_setup_msg() <= 0) break;
5416 if (!receive_msg(FALSE)) break;
5418 return_path = sender_address = NULL;
5419 dnslist_domain = dnslist_matched = NULL;
5420 #ifndef DISABLE_DKIM
5421 dkim_cur_signer = NULL;
5424 deliver_localpart_orig = NULL;
5425 deliver_domain_orig = NULL;
5426 callout_address = sending_ip_address = NULL;
5427 deliver_localpart_data = deliver_domain_data =
5428 recipient_data = sender_data = NULL;
5429 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5433 exim_exit(EXIT_SUCCESS);
5437 /* Arrange for message reception if recipients or SMTP were specified;
5438 otherwise complain unless a version print (-bV) happened or this is a filter
5439 verification test or info dump.
5440 In the former case, show the configuration file name. */
5442 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5444 if (version_printed)
5446 if (Ustrchr(config_main_filelist, ':'))
5447 printf("Configuration file search path is %s\n", config_main_filelist);
5448 printf("Configuration file is %s\n", config_main_filename);
5449 return EXIT_SUCCESS;
5452 if (info_flag != CMDINFO_NONE)
5454 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5455 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5458 if (filter_test == FTEST_NONE)
5459 exim_usage(called_as);
5463 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5464 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5465 that we are not called from inetd, because that is rejected above. The
5466 following configuration settings are forced here:
5468 (1) Synchronous delivery (-odi)
5469 (2) Errors to stderr (-oep == -oeq)
5470 (3) No parallel remote delivery
5471 (4) Unprivileged delivery
5473 We don't force overall queueing options because there are several of them;
5474 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5475 to override any SMTP queueing. */
5479 f.synchronous_delivery = TRUE;
5480 arg_error_handling = ERRORS_STDERR;
5481 remote_max_parallel = 1;
5482 deliver_drop_privilege = TRUE;
5483 f.queue_smtp = FALSE;
5484 queue_smtp_domains = NULL;
5486 message_utf8_downconvert = -1; /* convert-if-needed */
5491 /* Prepare to accept one or more new messages on the standard input. When a
5492 message has been read, its id is returned in message_id[]. If doing immediate
5493 delivery, we fork a delivery process for each received message, except for the
5494 last one, where we can save a process switch.
5496 It is only in non-smtp mode that error_handling is allowed to be changed from
5497 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5498 sendmail error modes other than -oem ever actually used? Later: yes.) */
5500 if (!smtp_input) error_handling = arg_error_handling;
5502 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5503 logging being sent down the socket and make an identd call to get the
5506 else if (f.is_inetd)
5508 (void)fclose(stderr);
5509 exim_nullstd(); /* Re-open to /dev/null */
5510 verify_get_ident(IDENT_PORT);
5511 host_build_sender_fullhost();
5512 set_process_info("handling incoming connection from %s via inetd",
5516 /* If the sender host address has been set, build sender_fullhost if it hasn't
5517 already been done (which it will have been for inetd). This caters for the
5518 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5519 so that the test for IP options is skipped for -bs input. */
5521 if (sender_host_address && !sender_fullhost)
5523 host_build_sender_fullhost();
5524 set_process_info("handling incoming connection from %s via -oMa",
5526 f.sender_host_notsocket = TRUE;
5529 /* Otherwise, set the sender host as unknown except for inetd calls. This
5530 prevents host checking in the case of -bs not from inetd and also for -bS. */
5532 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5534 /* If stdout does not exist, then dup stdin to stdout. This can happen
5535 if exim is started from inetd. In this case fd 0 will be set to the socket,
5536 but fd 1 will not be set. This also happens for passed SMTP channels. */
5538 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5540 /* Set up the incoming protocol name and the state of the program. Root is
5541 allowed to force received protocol via the -oMr option above. If we have come
5542 via inetd, the process info has already been set up. We don't set
5543 received_protocol here for smtp input, as it varies according to
5544 batch/HELO/EHLO/AUTH/TLS. */
5548 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5549 smtp_batched_input? "batched " : "",
5550 sender_address ? sender_address : originator_login);
5554 int old_pool = store_pool;
5555 store_pool = POOL_PERM;
5556 if (!received_protocol)
5557 received_protocol = string_sprintf("local%s", called_as);
5558 store_pool = old_pool;
5559 set_process_info("accepting a local non-SMTP message from <%s>",
5563 /* Initialize the session_local_queue-only flag (this will be ignored if
5564 mua_wrapper is set) */
5567 session_local_queue_only = queue_only;
5569 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5570 the spool if so configured. On failure, we must not attempt to send an error
5571 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5572 error code is given.) */
5574 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5575 exim_fail("exim: insufficient disk space\n");
5577 /* If this is smtp input of any kind, real or batched, handle the start of the
5580 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5581 because a log line has already been written for all its failure exists
5582 (usually "connection refused: <reason>") and writing another one is
5583 unnecessary clutter. */
5589 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5590 if (verify_check_host(&hosts_connection_nolog) == OK)
5592 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5593 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5595 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5596 if (!smtp_start_session())
5599 exim_exit(EXIT_SUCCESS);
5603 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5604 (we handle buferring so as to have visibility of fill level). */
5608 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5609 if (expand_string_message)
5610 if (thismessage_size_limit == -1)
5611 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5612 "message_size_limit: %s", expand_string_message);
5614 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5615 "message_size_limit: %s", expand_string_message);
5617 setvbuf(stdin, NULL, _IONBF, 0);
5620 /* Loop for several messages when reading SMTP input. If we fork any child
5621 processes, we don't want to wait for them unless synchronous delivery is
5622 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5623 same as SIG_DFL, despite the fact that documentation often lists the default as
5624 "ignore". This is a confusing area. This is what I know:
5626 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5627 processes that complete simply to go away without ever becoming defunct. You
5628 can't then wait for them - but we don't want to wait for them in the
5629 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5630 happen for all OS (e.g. *BSD is different).
5632 But that's not the end of the story. Some (many? all?) systems have the
5633 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5634 has by default, so it seems that the difference is merely one of default
5635 (compare restarting vs non-restarting signals).
5637 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5638 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5639 of the loop below. Paranoia rules.
5641 February 2003: That's *still* not the end of the story. There are now versions
5642 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5643 process then calls waitpid(), a grumble is written to the system log, because
5644 this is logically inconsistent. In other words, it doesn't like the paranoia.
5645 As a consequence of this, the waitpid() below is now excluded if we are sure
5646 that SIG_IGN works. */
5648 if (!f.synchronous_delivery)
5651 struct sigaction act;
5652 act.sa_handler = SIG_IGN;
5653 sigemptyset(&(act.sa_mask));
5654 act.sa_flags = SA_NOCLDWAIT;
5655 sigaction(SIGCHLD, &act, NULL);
5657 signal(SIGCHLD, SIG_IGN);
5661 /* Save the current store pool point, for resetting at the start of
5662 each message, and save the real sender address, if any. */
5664 real_sender_address = sender_address;
5666 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5667 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5670 for (BOOL more = TRUE; more; )
5672 rmark reset_point = store_mark();
5675 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5676 input and build the recipients list, before calling receive_msg() to read the
5677 message proper. Whatever sender address is given in the SMTP transaction is
5678 often ignored for local senders - we use the actual sender, which is normally
5679 either the underlying user running this process or a -f argument provided by
5680 a trusted caller. It is saved in real_sender_address. The test for whether to
5681 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5686 if ((rc = smtp_setup_msg()) > 0)
5688 if (real_sender_address != NULL &&
5689 !receive_check_set_sender(sender_address))
5691 sender_address = raw_sender = real_sender_address;
5692 sender_address_unrewritten = NULL;
5695 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5696 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5697 the very end. The result of the ACL is ignored (as for other non-SMTP
5698 messages). It is run for its potential side effects. */
5700 if (smtp_batched_input && acl_not_smtp_start != NULL)
5702 uschar *user_msg, *log_msg;
5703 f.enable_dollar_recipients = TRUE;
5704 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5705 &user_msg, &log_msg);
5706 f.enable_dollar_recipients = FALSE;
5709 /* Now get the data for the message */
5711 more = receive_msg(extract_recipients);
5714 cancel_cutthrough_connection(TRUE, US"receive dropped");
5715 if (more) goto MORELOOP;
5716 smtp_log_no_mail(); /* Log no mail if configured */
5717 exim_exit(EXIT_FAILURE);
5722 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5723 smtp_log_no_mail(); /* Log no mail if configured */
5724 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5728 /* In the non-SMTP case, we have all the information from the command
5729 line, but must process it in case it is in the more general RFC822
5730 format, and in any case, to detect syntax errors. Also, it appears that
5731 the use of comma-separated lists as single arguments is common, so we
5732 had better support them. */
5737 int count = argc - recipients_arg;
5738 uschar **list = argv + recipients_arg;
5740 /* These options cannot be changed dynamically for non-SMTP messages */
5742 f.active_local_sender_retain = local_sender_retain;
5743 f.active_local_from_check = local_from_check;
5745 /* Save before any rewriting */
5747 raw_sender = string_copy(sender_address);
5749 /* Loop for each argument (supplied by user hence tainted) */
5751 for (int i = 0; i < count; i++)
5753 int start, end, domain;
5755 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5756 * We'll still want to cap it to something, just in case. */
5757 uschar * s = string_copy_taint(
5758 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5761 /* Loop for each comma-separated address */
5765 BOOL finished = FALSE;
5767 uschar *ss = parse_find_address_end(s, FALSE);
5769 if (*ss == ',') *ss = 0; else finished = TRUE;
5771 /* Check max recipients - if -t was used, these aren't recipients */
5773 if (recipients_max > 0 && ++rcount > recipients_max &&
5774 !extract_recipients)
5775 if (error_handling == ERRORS_STDERR)
5777 fprintf(stderr, "exim: too many recipients\n");
5778 exim_exit(EXIT_FAILURE);
5782 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5783 errors_sender_rc : EXIT_FAILURE;
5787 BOOL b = allow_utf8_domains;
5788 allow_utf8_domains = TRUE;
5791 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5795 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5796 else allow_utf8_domains = b;
5801 if (domain == 0 && !f.allow_unqualified_recipient)
5804 errmess = US"unqualified recipient address not allowed";
5808 if (error_handling == ERRORS_STDERR)
5810 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5811 string_printing(list[i]), errmess);
5812 exim_exit(EXIT_FAILURE);
5818 eblock.text1 = string_printing(list[i]);
5819 eblock.text2 = errmess;
5821 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5822 errors_sender_rc : EXIT_FAILURE;
5825 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5828 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5832 /* Show the recipients when debugging */
5836 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5837 if (recipients_list)
5839 debug_printf("Recipients:\n");
5840 for (int i = 0; i < recipients_count; i++)
5841 debug_printf(" %s\n", recipients_list[i].address);
5845 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5846 ignored; rejecting here would just add complication, and it can just as
5847 well be done later. Allow $recipients to be visible in the ACL. */
5849 if (acl_not_smtp_start)
5851 uschar *user_msg, *log_msg;
5852 f.enable_dollar_recipients = TRUE;
5853 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5854 &user_msg, &log_msg);
5855 f.enable_dollar_recipients = FALSE;
5858 /* Pause for a while waiting for input. If none received in that time,
5859 close the logfile, if we had one open; then if we wait for a long-running
5860 datasource (months, in one use-case) log rotation will not leave us holding
5863 if (!receive_timeout)
5864 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5867 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5868 will just read the headers for the message, and not write anything onto the
5871 message_ended = END_NOTENDED;
5872 more = receive_msg(extract_recipients);
5874 /* more is always FALSE here (not SMTP message) when reading a message
5875 for real; when reading the headers of a message for filter testing,
5876 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5878 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5879 } /* Non-SMTP message reception */
5881 /* If this is a filter testing run, there are headers in store, but
5882 no message on the spool. Run the filtering code in testing mode, setting
5883 the domain to the qualify domain and the local part to the current user,
5884 unless they have been set by options. The prefix and suffix are left unset
5885 unless specified. The the return path is set to to the sender unless it has
5886 already been set from a return-path header in the message. */
5888 if (filter_test != FTEST_NONE)
5890 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5891 deliver_domain_orig = deliver_domain;
5892 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5893 deliver_localpart_orig = deliver_localpart;
5894 deliver_localpart_prefix = US ftest_prefix;
5895 deliver_localpart_suffix = US ftest_suffix;
5896 deliver_home = originator_home;
5900 printf("Return-path copied from sender\n");
5901 return_path = string_copy(sender_address);
5904 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5905 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5907 receive_add_recipient(
5908 string_sprintf("%s%s%s@%s",
5909 ftest_prefix ? ftest_prefix : US"",
5911 ftest_suffix ? ftest_suffix : US"",
5912 deliver_domain), -1);
5914 printf("Recipient = %s\n", recipients_list[0].address);
5915 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5916 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5918 if (chdir("/")) /* Get away from wherever the user is running this from */
5920 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5921 exim_exit(EXIT_FAILURE);
5924 /* Now we run either a system filter test, or a user filter test, or both.
5925 In the latter case, headers added by the system filter will persist and be
5926 available to the user filter. We need to copy the filter variables
5929 if (filter_test & FTEST_SYSTEM)
5930 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5931 exim_exit(EXIT_FAILURE);
5933 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5935 if (filter_test & FTEST_USER)
5936 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5937 exim_exit(EXIT_FAILURE);
5939 exim_exit(EXIT_SUCCESS);
5942 /* Else act on the result of message reception. We should not get here unless
5943 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5944 will be TRUE. If it is not, check on the number of messages received in this
5947 if ( !session_local_queue_only
5948 && smtp_accept_queue_per_connection > 0
5949 && receive_messagecount > smtp_accept_queue_per_connection)
5951 session_local_queue_only = TRUE;
5952 queue_only_reason = 2;
5955 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5956 and queue_only_load is set, check that the load average is below it. If it is
5957 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5958 default), we put the whole session into queue_only mode. It then remains this
5959 way for any subsequent messages on the same SMTP connection. This is a
5960 deliberate choice; even though the load average may fall, it doesn't seem
5961 right to deliver later messages on the same call when not delivering earlier
5962 ones. However, there are odd cases where this is not wanted, so this can be
5963 changed by setting queue_only_load_latch false. */
5965 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5966 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5968 queue_only_reason = 3;
5969 if (queue_only_load_latch) session_local_queue_only = TRUE;
5972 /* If running as an MUA wrapper, all queueing options and freezing options
5976 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5978 /* Log the queueing here, when it will get a message id attached, but
5979 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5982 if (local_queue_only)
5984 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5985 switch(queue_only_reason)
5988 log_write(L_delay_delivery,
5989 LOG_MAIN, "no immediate delivery: more than %d messages "
5990 "received in one connection", smtp_accept_queue_per_connection);
5994 log_write(L_delay_delivery,
5995 LOG_MAIN, "no immediate delivery: load average %.2f",
5996 (double)load_average/1000.0);
6001 else if (f.queue_only_policy || f.deliver_freeze)
6002 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6004 /* Else do the delivery unless the ACL or local_scan() called for queue only
6005 or froze the message. Always deliver in a separate process. A fork failure is
6006 not a disaster, as the delivery will eventually happen on a subsequent queue
6007 run. The search cache must be tidied before the fork, as the parent will
6008 do it before exiting. The child will trigger a lookup failure and
6009 thereby defer the delivery if it tries to use (for example) a cached ldap
6010 connection that the parent has called unbind on. */
6017 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6020 close_unwanted(); /* Close unwanted file descriptors and TLS */
6021 exim_nullstd(); /* Ensure std{in,out,err} exist */
6023 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6024 mode, deliver_drop_privilege is forced TRUE). */
6026 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6028 delivery_re_exec(CEE_EXEC_EXIT);
6029 /* Control does not return here. */
6032 /* No need to re-exec */
6034 rc = deliver_message(message_id, FALSE, FALSE);
6036 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6037 ? EXIT_SUCCESS : EXIT_FAILURE);
6042 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6043 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6044 "process: %s", strerror(errno));
6048 release_cutthrough_connection(US"msg passed for delivery");
6050 /* In the parent, wait if synchronous delivery is required. This will
6051 always be the case in MUA wrapper mode. */
6053 if (f.synchronous_delivery)
6056 while (wait(&status) != pid);
6057 if ((status & 0x00ff) != 0)
6058 log_write(0, LOG_MAIN|LOG_PANIC,
6059 "process %d crashed with signal %d while delivering %s",
6060 (int)pid, status & 0x00ff, message_id);
6061 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6066 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6067 automatically reaps children (see comments above the loop), clear away any
6068 finished subprocesses here, in case there are lots of messages coming in
6069 from the same source. */
6071 #ifndef SIG_IGN_WORKS
6072 while (waitpid(-1, NULL, WNOHANG) > 0);
6076 return_path = sender_address = NULL;
6077 authenticated_sender = NULL;
6078 deliver_localpart_orig = NULL;
6079 deliver_domain_orig = NULL;
6080 deliver_host = deliver_host_address = NULL;
6081 dnslist_domain = dnslist_matched = NULL;
6082 #ifdef WITH_CONTENT_SCAN
6083 malware_name = NULL;
6086 callout_address = NULL;
6087 sending_ip_address = NULL;
6088 deliver_localpart_data = deliver_domain_data =
6089 recipient_data = sender_data = NULL;
6092 store_reset(reset_point);
6095 exim_exit(EXIT_SUCCESS); /* Never returns */
6096 return 0; /* To stop compiler warning */