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. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
17 #if defined(__GLIBC__) && !defined(__UCLIBC__)
18 # include <gnu/libc-version.h>
25 # include <execinfo.h>
29 # include <gnutls/gnutls.h>
30 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
35 extern void init_lookup_list(void);
39 /*************************************************
40 * Function interface to store functions *
41 *************************************************/
43 /* We need some real functions to pass to the PCRE regular expression library
44 for store allocation via Exim's store manager. The normal calls are actually
45 macros that pass over location information to make tracing easier. These
46 functions just interface to the standard macro calls. A good compiler will
47 optimize out the tail recursion and so not make them too expensive. */
50 function_store_malloc(PCRE2_SIZE size, void * tag)
52 return store_malloc((int)size);
56 function_store_free(void * block, void * tag)
58 /* At least some version of pcre2 pass a null pointer */
59 if (block) store_free(block);
64 function_store_get(PCRE2_SIZE size, void * tag)
66 return store_get((int)size, GET_UNTAINTED); /* loses track of taint */
70 function_store_nullfree(void * block, void * tag)
77 /*************************************************
78 * Enums for cmdline interface *
79 *************************************************/
81 enum commandline_info { CMDINFO_NONE=0,
82 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
90 pcre_mlc_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
91 pcre_gen_ctx = pcre2_general_context_create(function_store_get, function_store_nullfree, NULL);
93 pcre_mlc_cmp_ctx = pcre2_compile_context_create(pcre_mlc_ctx);
94 pcre_gen_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
96 pcre_gen_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
102 /*************************************************
103 * Execute regular expression and set strings *
104 *************************************************/
106 /* This function runs a regular expression match, and sets up the pointers to
107 the matched substrings. The matched strings are copied so the lifetime of
108 the subject is not a problem. Matched strings will have the same taint status
109 as the subject string (this is not a de-taint method, and must not be made so
110 given the support for wildcards in REs).
113 re the compiled expression
114 subject the subject string
115 options additional PCRE options
116 setup if < 0 do full setup
117 if >= 0 setup from setup+1 onwards,
118 excluding the full matched string
120 Returns: TRUE if matched, or FALSE
124 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
126 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
127 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
128 PCRE_EOPT | options, md, pcre_gen_mtc_ctx);
131 if ((yield = (res >= 0)))
133 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
134 res = pcre2_get_ovector_count(md);
135 expand_nmax = setup < 0 ? 0 : setup + 1;
136 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
138 /* Although PCRE2 has a pcre2_substring_get_bynumber() conveneience, it
139 seems to return a bad pointer when a capture group had no data, eg. (.*)
140 matching zero letters. So use the underlying ovec and hope (!) that the
141 offsets are sane (including that case). Should we go further and range-
142 check each one vs. the subject string length? */
143 int off = matchnum * 2;
144 int len = ovec[off + 1] - ovec[off];
145 expand_nstring[expand_nmax] = string_copyn(subject + ovec[off], len);
146 expand_nlength[expand_nmax++] = len;
150 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
153 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
154 debug_printf_indent("pcre2: %s\n", errbuf);
156 /* pcre2_match_data_free(md); gen ctx needs no free */
161 /* Check just for match with regex. Uses the common memory-handling.
165 subject string to be checked
166 slen length of subject; -1 for nul-terminated
167 rptr pointer for matched string, copied, or NULL
169 Return: TRUE for a match.
173 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
175 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
176 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
177 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
178 0, PCRE_EOPT, md, pcre_gen_mtc_ctx);
179 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
185 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
188 /* pcre2_match_data_free(md); gen ctx needs no free */
194 /*************************************************
195 * Set up processing details *
196 *************************************************/
198 /* Save a text string for dumping when SIGUSR1 is received.
199 Do checks for overruns.
201 Arguments: format and arguments, as for printf()
206 set_process_info(const char * format, ...)
208 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
214 g = string_fmt_append(&gs, "%5d ", (int)getpid());
215 len = gstring_length(g);
216 va_start(ap, format);
217 if (!string_vformat(g, 0, format, ap))
220 g = string_cat(&gs, US"**** string overflowed buffer ****");
222 g = string_catn(g, US"\n", 1);
223 process_info_len = len_string_from_gstring(g, &s);
224 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
228 /***********************************************
229 * Handler for SIGTERM *
230 ***********************************************/
233 term_handler(int sig)
239 /***********************************************
240 * Handler for SIGSEGV *
241 ***********************************************/
243 #define STACKDUMP_MAX 24
248 void * buf[STACKDUMP_MAX];
250 int nptrs = backtrace(buf, STACKDUMP_MAX);
252 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace");
253 log_write(0, LOG_MAIN|LOG_PANIC, "---");
254 if ((ss = backtrace_symbols(buf, nptrs)))
256 for (int i = 0; i < nptrs; i++)
257 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s", ss[i]);
261 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s", strerror(errno));
262 log_write(0, LOG_MAIN|LOG_PANIC, "---");
270 segv_handler(int sig, siginfo_t * info, void * uctx)
272 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
273 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
274 switch (info->si_code)
276 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
277 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
278 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
279 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
282 if (US info->si_addr < US 4096)
283 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
285 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
286 if (process_info_len > 0)
287 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
289 signal(SIGSEGV, SIG_DFL);
294 segv_handler(int sig)
296 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
297 if (process_info_len > 0)
298 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
300 signal(SIGSEGV, SIG_DFL);
306 /*************************************************
307 * Handler for SIGUSR1 *
308 *************************************************/
310 /* SIGUSR1 causes any exim process to write to the process log details of
311 what it is currently doing. It will only be used if the OS is capable of
312 setting up a handler that causes automatic restarting of any system call
313 that is in progress at the time.
315 This function takes care to be signal-safe.
317 Argument: the signal number (SIGUSR1)
322 usr1_handler(int sig)
326 os_restarting_signal(sig, usr1_handler);
328 if (!process_log_path) return;
329 fd = log_open_as_exim(process_log_path);
331 /* If we are neither exim nor root, or if we failed to create the log file,
332 give up. There is not much useful we can do with errors, since we don't want
333 to disrupt whatever is going on outside the signal handler. */
337 (void)write(fd, process_info, process_info_len);
343 /*************************************************
345 *************************************************/
347 /* This handler is enabled most of the time that Exim is running. The handler
348 doesn't actually get used unless alarm() has been called to set a timer, to
349 place a time limit on a system call of some kind. When the handler is run, it
352 There are some other SIGALRM handlers that are used in special cases when more
353 than just a flag setting is required; for example, when reading a message's
354 input. These are normally set up in the code module that uses them, and the
355 SIGALRM handler is reset to this one afterwards.
357 Argument: the signal value (SIGALRM)
362 sigalrm_handler(int sig)
365 os_non_restarting_signal(SIGALRM, sigalrm_handler);
370 /*************************************************
371 * Sleep for a fractional time interval *
372 *************************************************/
374 /* This function is called by millisleep() and exim_wait_tick() to wait for a
375 period of time that may include a fraction of a second. The coding is somewhat
376 tedious. We do not expect setitimer() ever to fail, but if it does, the process
377 will wait for ever, so we panic in this instance. (There was a case of this
378 when a bug in a function that calls milliwait() caused it to pass invalid data.
379 That's when I added the check. :-)
381 We assume it to be not worth sleeping for under 50us; this value will
382 require revisiting as hardware advances. This avoids the issue of
383 a zero-valued timer setting meaning "never fire".
385 Argument: an itimerval structure containing the interval
390 milliwait(struct itimerval *itval)
393 sigset_t old_sigmask;
394 int save_errno = errno;
396 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
398 (void)sigemptyset(&sigmask); /* Empty mask */
399 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
400 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
401 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
402 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
403 "setitimer() failed: %s", strerror(errno));
404 (void)sigfillset(&sigmask); /* All signals */
405 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
406 (void)sigsuspend(&sigmask); /* Until SIGALRM */
407 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
409 sigalrm_seen = FALSE;
415 /*************************************************
416 * Millisecond sleep function *
417 *************************************************/
419 /* The basic sleep() function has a granularity of 1 second, which is too rough
420 in some cases - for example, when using an increasing delay to slow down
423 Argument: number of millseconds
430 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
431 .it_value = {.tv_sec = msec/1000,
432 .tv_usec = (msec % 1000) * 1000}};
438 /*************************************************
439 * Compare microsecond times *
440 *************************************************/
447 Returns: -1, 0, or +1
451 exim_tvcmp(struct timeval *t1, struct timeval *t2)
453 if (t1->tv_sec > t2->tv_sec) return +1;
454 if (t1->tv_sec < t2->tv_sec) return -1;
455 if (t1->tv_usec > t2->tv_usec) return +1;
456 if (t1->tv_usec < t2->tv_usec) return -1;
463 /*************************************************
464 * Clock tick wait function *
465 *************************************************/
467 #ifdef _POSIX_MONOTONIC_CLOCK
468 # ifdef CLOCK_BOOTTIME
469 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
471 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
474 /* Amount EXIM_CLOCK is behind realtime, at startup. */
475 static struct timespec offset_ts;
478 exim_clock_init(void)
481 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
482 (void)gettimeofday(&tv, NULL);
483 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
484 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
485 if (offset_ts.tv_nsec >= 0) return;
487 offset_ts.tv_nsec += 1000*1000*1000;
493 exim_gettime(struct timeval * tv)
495 #ifdef _POSIX_MONOTONIC_CLOCK
496 struct timespec now_ts;
498 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
500 now_ts.tv_sec += offset_ts.tv_sec;
501 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
504 now_ts.tv_nsec -= 1000*1000*1000;
506 tv->tv_sec = now_ts.tv_sec;
507 tv->tv_usec = now_ts.tv_nsec / 1000;
511 (void)gettimeofday(tv, NULL);
515 /* Exim uses a time + a pid to generate a unique identifier in two places: its
516 message IDs, and in file names for maildir deliveries. Because some OS now
517 re-use pids within the same second, sub-second times are now being used.
518 However, for absolute certainty, we must ensure the clock has ticked before
519 allowing the relevant process to complete. At the time of implementation of
520 this code (February 2003), the speed of processors is such that the clock will
521 invariably have ticked already by the time a process has done its job. This
522 function prepares for the time when things are faster - and it also copes with
523 clocks that go backwards.
526 prev_tv A timeval which was used to create uniqueness; its usec field
527 has been rounded down to the value of the resolution.
528 We want to be sure the current time is greater than this.
529 On return, updated to current (rounded down).
530 resolution The resolution that was used to divide the microseconds
531 (1 for maildir, larger for message ids)
537 exim_wait_tick(struct timeval * prev_tv, int resolution)
539 struct timeval now_tv;
540 long int now_true_usec;
542 exim_gettime(&now_tv);
543 now_true_usec = now_tv.tv_usec;
544 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
546 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
548 struct itimerval itval;
549 itval.it_interval.tv_sec = 0;
550 itval.it_interval.tv_usec = 0;
551 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
552 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
554 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
555 negative value for the microseconds is possible only in the case when "now"
556 is more than a second less than "tgt". That means that itval.it_value.tv_sec
557 is greater than zero. The following correction is therefore safe. */
559 if (itval.it_value.tv_usec < 0)
561 itval.it_value.tv_usec += 1000000;
562 itval.it_value.tv_sec -= 1;
565 DEBUG(D_transport|D_receive)
567 if (!f.running_in_test_harness)
569 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
570 prev_tv->tv_sec, (long) prev_tv->tv_usec,
571 now_tv.tv_sec, (long) now_tv.tv_usec);
572 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
573 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
579 /* Be prapared to go around if the kernel does not implement subtick
580 granularity (GNU Hurd) */
582 exim_gettime(&now_tv);
583 now_true_usec = now_tv.tv_usec;
584 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
592 /*************************************************
593 * Call fopen() with umask 777 and adjust mode *
594 *************************************************/
596 /* Exim runs with umask(0) so that files created with open() have the mode that
597 is specified in the open() call. However, there are some files, typically in
598 the spool directory, that are created with fopen(). They end up world-writeable
599 if no precautions are taken. Although the spool directory is not accessible to
600 the world, this is an untidiness. So this is a wrapper function for fopen()
601 that sorts out the mode of the created file.
604 filename the file name
605 options the fopen() options
606 mode the required mode
608 Returns: the fopened FILE or NULL
612 modefopen(const uschar *filename, const char *options, mode_t mode)
614 mode_t saved_umask = umask(0777);
615 FILE *f = Ufopen(filename, options);
616 (void)umask(saved_umask);
617 if (f != NULL) (void)fchmod(fileno(f), mode);
622 /*************************************************
623 * Ensure stdin, stdout, and stderr exist *
624 *************************************************/
626 /* Some operating systems grumble if an exec() happens without a standard
627 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
628 file will be opened and will use these fd values, and then some other bit of
629 code will assume, for example, that it can write error messages to stderr.
630 This function ensures that fds 0, 1, and 2 are open if they do not already
631 exist, by connecting them to /dev/null.
633 This function is also used to ensure that std{in,out,err} exist at all times,
634 so that if any library that Exim calls tries to use them, it doesn't crash.
645 for (int i = 0; i <= 2; i++)
647 if (fstat(i, &statbuf) < 0 && errno == EBADF)
649 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
650 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
651 string_open_failed("/dev/null", NULL));
652 if (devnull != i) (void)dup2(devnull, i);
655 if (devnull > 2) (void)close(devnull);
661 /*************************************************
662 * Close unwanted file descriptors for delivery *
663 *************************************************/
665 /* This function is called from a new process that has been forked to deliver
666 an incoming message, either directly, or using exec.
668 We want any smtp input streams to be closed in this new process. However, it
669 has been observed that using fclose() here causes trouble. When reading in -bS
670 input, duplicate copies of messages have been seen. The files will be sharing a
671 file pointer with the parent process, and it seems that fclose() (at least on
672 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
673 least sometimes. Hence we go for closing the underlying file descriptors.
675 If TLS is active, we want to shut down the TLS library, but without molesting
676 the parent's SSL connection.
678 For delivery of a non-SMTP message, we want to close stdin and stdout (and
679 stderr unless debugging) because the calling process might have set them up as
680 pipes and be waiting for them to close before it waits for the submission
681 process to terminate. If they aren't closed, they hold up the calling process
682 until the initial delivery process finishes, which is not what we want.
684 Exception: We do want it for synchronous delivery!
686 And notwithstanding all the above, if D_resolver is set, implying resolver
687 debugging, leave stdout open, because that's where the resolver writes its
690 When we close stderr (which implies we've also closed stdout), we also get rid
691 of any controlling terminal.
703 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
705 (void)close(fileno(smtp_in));
706 (void)close(fileno(smtp_out));
711 (void)close(0); /* stdin */
712 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
713 if (debug_selector == 0) /* stderr */
715 if (!f.synchronous_delivery)
728 /*************************************************
730 *************************************************/
732 /* This function sets a new uid and gid permanently, optionally calling
733 initgroups() to set auxiliary groups. There are some special cases when running
734 Exim in unprivileged modes. In these situations the effective uid will not be
735 root; if we already have the right effective uid/gid, and don't need to
736 initialize any groups, leave things as they are.
741 igflag TRUE if initgroups() wanted
742 msg text to use in debugging output and failure log
744 Returns: nothing; bombs out on failure
748 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
750 uid_t euid = geteuid();
751 gid_t egid = getegid();
753 if (euid == root_uid || euid != uid || egid != gid || igflag)
755 /* At least one OS returns +1 for initgroups failure, so just check for
760 struct passwd *pw = getpwuid(uid);
762 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
763 "no passwd entry for uid=%ld", (long int)uid);
765 if (initgroups(pw->pw_name, gid) != 0)
766 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
767 (long int)uid, strerror(errno));
770 if (setgid(gid) < 0 || setuid(uid) < 0)
771 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
772 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
775 /* Debugging output included uid/gid and all groups */
779 int group_count, save_errno;
780 gid_t group_list[EXIM_GROUPLIST_SIZE];
781 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
782 (long int)geteuid(), (long int)getegid(), (long int)getpid());
783 group_count = getgroups(nelem(group_list), group_list);
785 debug_printf(" auxiliary group list:");
787 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
788 else if (group_count < 0)
789 debug_printf(" <error: %s>", strerror(save_errno));
790 else debug_printf(" <none>");
798 /*************************************************
800 *************************************************/
802 /* Exim exits via this function so that it always clears up any open
808 Returns: does not return
817 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
818 ">>>>>>>>>>>>>>>>\n",
819 (int)getpid(), process_purpose, rc);
825 exim_underbar_exit(int rc)
829 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
830 ">>>>>>>>>>>>>>>>\n",
831 (int)getpid(), process_purpose, rc);
837 /* Print error string, then die */
839 exim_fail(const char * fmt, ...)
843 vfprintf(stderr, fmt, ap);
848 /* fail if a length is too long */
850 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
852 if (itemlen <= maxlen)
854 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
855 itemlen, maxlen, description);
859 /* only pass through the string item back to the caller if it's short enough */
860 static inline const uschar *
861 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
863 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
867 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
868 of chown()/fchown(). See src/functions.h for more explanation */
870 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
872 int saved_errno = errno; /* from the preceeding chown call */
874 log_write(0, LOG_MAIN|LOG_PANIC,
875 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
876 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
877 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
879 /* I leave this here, commented, in case the "bug"(?) comes up again.
880 It is not an Exim bug, but we can provide a workaround.
886 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
888 if (buf.st_uid == owner && buf.st_gid == group) return 0;
889 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
891 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
899 /*************************************************
900 * Extract port from host address *
901 *************************************************/
903 /* Called to extract the port from the values given to -oMa and -oMi.
904 It also checks the syntax of the address, and terminates it before the
905 port data when a port is extracted.
908 address the address, with possible port on the end
910 Returns: the port, or zero if there isn't one
911 bombs out on a syntax error
915 check_port(uschar *address)
917 int port = host_address_extract_port(address);
918 if (string_is_ip_address(address, NULL) == 0)
919 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
925 /*************************************************
926 * Test/verify an address *
927 *************************************************/
929 /* This function is called by the -bv and -bt code. It extracts a working
930 address from a full RFC 822 address. This isn't really necessary per se, but it
931 has the effect of collapsing source routes.
935 flags flag bits for verify_address()
936 exit_value to be set for failures
942 test_address(uschar *s, int flags, int *exit_value)
944 int start, end, domain;
945 uschar *parse_error = NULL;
946 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
950 fprintf(stdout, "syntax error: %s\n", parse_error);
955 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
956 -1, -1, NULL, NULL, NULL);
957 if (rc == FAIL) *exit_value = 2;
958 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
964 /*************************************************
965 * Show supported features *
966 *************************************************/
969 show_string(BOOL is_stdout, gstring * g)
971 const uschar * s = string_from_gstring(g);
973 if (is_stdout) fputs(CCS s, stdout);
974 else debug_printf("%s", s);
979 show_db_version(gstring * g)
981 #ifdef DB_VERSION_STRING
984 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
985 g = string_fmt_append(g, " Runtime: %s\n",
986 db_version(NULL, NULL, NULL));
989 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
991 #elif defined(BTREEVERSION) && defined(HASHVERSION)
993 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
995 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
998 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
999 g = string_cat(g, US"Probably ndbm\n");
1000 #elif defined(USE_TDB)
1001 g = string_cat(g, US"Using tdb\n");
1004 g = string_cat(g, US"Probably GDBM (native mode)\n");
1006 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1013 /* This function is called for -bV/--version and for -d to output the optional
1014 features of the current Exim binary.
1016 Arguments: BOOL, true for stdout else debug channel
1021 show_whats_supported(BOOL is_stdout)
1023 rmark reset_point = store_mark();
1026 DEBUG(D_any) {} else g = show_db_version(g);
1028 g = string_cat(g, US"Support for:");
1029 #ifdef SUPPORT_CRYPTEQ
1030 g = string_cat(g, US" crypteq");
1033 g = string_cat(g, US" iconv()");
1036 g = string_cat(g, US" IPv6");
1038 #ifdef HAVE_SETCLASSRESOURCES
1039 g = string_cat(g, US" use_setclassresources");
1042 g = string_cat(g, US" PAM");
1045 g = string_cat(g, US" Perl");
1047 #ifdef EXPAND_DLFUNC
1048 g = string_cat(g, US" Expand_dlfunc");
1050 #ifdef USE_TCP_WRAPPERS
1051 g = string_cat(g, US" TCPwrappers");
1054 g = string_cat(g, US" GnuTLS");
1057 g = string_cat(g, US" OpenSSL");
1059 #ifndef DISABLE_TLS_RESUME
1060 g = string_cat(g, US" TLS_resume");
1062 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1063 g = string_cat(g, US" translate_ip_address");
1065 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1066 g = string_cat(g, US" move_frozen_messages");
1068 #ifdef WITH_CONTENT_SCAN
1069 g = string_cat(g, US" Content_Scanning");
1072 g = string_cat(g, US" DANE");
1074 #ifndef DISABLE_DKIM
1075 g = string_cat(g, US" DKIM");
1077 #ifdef SUPPORT_DMARC
1078 g = string_cat(g, US" DMARC");
1080 #ifndef DISABLE_DNSSEC
1081 g = string_cat(g, US" DNSSEC");
1083 #ifndef DISABLE_EVENT
1084 g = string_cat(g, US" Event");
1087 g = string_cat(g, US" I18N");
1089 #ifndef DISABLE_OCSP
1090 g = string_cat(g, US" OCSP");
1092 #ifndef DISABLE_PIPE_CONNECT
1093 g = string_cat(g, US" PIPECONNECT");
1095 #ifndef DISABLE_PRDR
1096 g = string_cat(g, US" PRDR");
1098 #ifdef SUPPORT_PROXY
1099 g = string_cat(g, US" PROXY");
1101 #ifndef DISABLE_QUEUE_RAMP
1102 g = string_cat(g, US" Queue_Ramp");
1104 #ifdef SUPPORT_SOCKS
1105 g = string_cat(g, US" SOCKS");
1108 g = string_cat(g, US" SPF");
1110 #if defined(SUPPORT_SRS)
1111 g = string_cat(g, US" SRS");
1115 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1117 #ifdef EXPERIMENTAL_ARC
1118 g = string_cat(g, US" Experimental_ARC");
1120 #ifdef EXPERIMENTAL_BRIGHTMAIL
1121 g = string_cat(g, US" Experimental_Brightmail");
1123 #ifdef EXPERIMENTAL_DCC
1124 g = string_cat(g, US" Experimental_DCC");
1126 #ifdef EXPERIMENTAL_DSN_INFO
1127 g = string_cat(g, US" Experimental_DSN_info");
1129 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1130 g = string_cat(g, US" Experimental_ESMTP_Limits");
1132 #ifdef EXPERIMENTAL_QUEUEFILE
1133 g = string_cat(g, US" Experimental_QUEUEFILE");
1135 g = string_cat(g, US"\n");
1137 g = string_cat(g, US"Lookups (built-in):");
1138 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1139 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1141 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1142 g = string_cat(g, US" cdb");
1144 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1145 g = string_cat(g, US" dbm dbmjz dbmnz");
1147 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1148 g = string_cat(g, US" dnsdb");
1150 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1151 g = string_cat(g, US" dsearch");
1153 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1154 g = string_cat(g, US" ibase");
1156 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1157 g = string_cat(g, US" json");
1159 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1160 g = string_cat(g, US" ldap ldapdn ldapm");
1163 g = string_cat(g, US" lmdb");
1165 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1166 g = string_cat(g, US" mysql");
1168 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1169 g = string_cat(g, US" nis nis0");
1171 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1172 g = string_cat(g, US" nisplus");
1174 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1175 g = string_cat(g, US" oracle");
1177 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1178 g = string_cat(g, US" passwd");
1180 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1181 g = string_cat(g, US" pgsql");
1183 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1184 g = string_cat(g, US" redis");
1186 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1187 g = string_cat(g, US" sqlite");
1189 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1190 g = string_cat(g, US" testdb");
1192 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1193 g = string_cat(g, US" whoson");
1195 g = string_cat(g, US"\n");
1197 g = auth_show_supported(g);
1198 g = route_show_supported(g);
1199 g = transport_show_supported(g);
1201 #ifdef WITH_CONTENT_SCAN
1202 g = malware_show_supported(g);
1204 show_string(is_stdout, g); g = NULL;
1206 if (fixed_never_users[0] > 0)
1209 g = string_cat(g, US"Fixed never_users: ");
1210 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1211 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1212 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1215 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1217 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1219 /* Everything else is details which are only worth reporting when debugging.
1220 Perhaps the tls_version_report should move into this too. */
1224 /* clang defines __GNUC__ (at least, for me) so test for it first */
1225 #if defined(__clang__)
1226 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1227 #elif defined(__GNUC__)
1229 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1231 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1234 g = string_cat(g, US"Compiler: <unknown>\n");
1237 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1238 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1239 __GLIBC__, __GLIBC_MINOR__);
1240 if (__GLIBC_PREREQ(2, 1))
1241 g = string_fmt_append(g, " Runtime: %s\n",
1242 gnu_get_libc_version());
1245 g = show_db_version(g);
1248 g = tls_version_report(g);
1251 g = utf8_version_report(g);
1253 #ifdef SUPPORT_DMARC
1254 g = dmarc_version_report(g);
1257 g = spf_lib_version_report(g);
1260 show_string(is_stdout, g);
1263 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1264 if (authi->version_report)
1265 g = (*authi->version_report)(g);
1267 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1268 characters; unless it's an ancient version of PCRE in which case it
1270 #ifndef PCRE_PRERELEASE
1271 # define PCRE_PRERELEASE
1274 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1277 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1278 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1280 PCRE2_MAJOR, PCRE2_MINOR,
1281 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1285 #undef EXPAND_AND_QUOTE
1287 show_string(is_stdout, g);
1291 for (int i = 0; i < lookup_list_count; i++)
1292 if (lookup_list[i]->version_report)
1293 g = lookup_list[i]->version_report(g);
1294 show_string(is_stdout, g);
1297 #ifdef WHITELIST_D_MACROS
1298 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1300 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1302 #ifdef TRUSTED_CONFIG_LIST
1303 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1305 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1309 show_string(is_stdout, g);
1310 store_reset(reset_point);
1314 /*************************************************
1315 * Show auxiliary information about Exim *
1316 *************************************************/
1319 show_exim_information(enum commandline_info request, FILE *stream)
1324 fprintf(stream, "Oops, something went wrong.\n");
1328 "The -bI: flag takes a string indicating which information to provide.\n"
1329 "If the string is not recognised, you'll get this help (on stderr).\n"
1331 " exim -bI:help this information\n"
1332 " exim -bI:dscp list of known dscp value keywords\n"
1333 " exim -bI:sieve list of supported sieve extensions\n"
1337 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1338 fprintf(stream, "%s\n", *pp);
1341 dscp_list_to_stream(stream);
1347 /*************************************************
1348 * Quote a local part *
1349 *************************************************/
1351 /* This function is used when a sender address or a From: or Sender: header
1352 line is being created from the caller's login, or from an authenticated_id. It
1353 applies appropriate quoting rules for a local part.
1355 Argument: the local part
1356 Returns: the local part, quoted if necessary
1360 local_part_quote(uschar *lpart)
1362 BOOL needs_quote = FALSE;
1365 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1367 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1368 (*t != '.' || t == lpart || t[1] == 0);
1371 if (!needs_quote) return lpart;
1373 g = string_catn(NULL, US"\"", 1);
1377 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1380 g = string_cat(g, lpart);
1383 g = string_catn(g, lpart, nq - lpart);
1384 g = string_catn(g, US"\\", 1);
1385 g = string_catn(g, nq, 1);
1389 g = string_catn(g, US"\"", 1);
1390 return string_from_gstring(g);
1396 /*************************************************
1397 * Load readline() functions *
1398 *************************************************/
1400 /* This function is called from testing executions that read data from stdin,
1401 but only when running as the calling user. Currently, only -be does this. The
1402 function loads the readline() function library and passes back the functions.
1403 On some systems, it needs the curses library, so load that too, but try without
1404 it if loading fails. All this functionality has to be requested at build time.
1407 fn_readline_ptr pointer to where to put the readline pointer
1408 fn_addhist_ptr pointer to where to put the addhistory function
1410 Returns: the dlopen handle or NULL on failure
1414 set_readline(char * (**fn_readline_ptr)(const char *),
1415 void (**fn_addhist_ptr)(const char *))
1418 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1420 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1421 if (dlhandle_curses) dlclose(dlhandle_curses);
1425 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1426 * char * readline (const char *prompt);
1427 * void add_history (const char *string);
1429 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1430 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1433 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1441 /*************************************************
1442 * Get a line from stdin for testing things *
1443 *************************************************/
1445 /* This function is called when running tests that can take a number of lines
1446 of input (for example, -be and -bt). It handles continuations and trailing
1447 spaces. And prompting and a blank line output on eof. If readline() is in use,
1448 the arguments are non-NULL and provide the relevant functions.
1451 fn_readline readline function or NULL
1452 fn_addhist addhist function or NULL
1454 Returns: pointer to dynamic memory, or NULL at end of file
1458 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1461 BOOL had_input = FALSE;
1463 if (!fn_readline) { printf("> "); fflush(stdout); }
1465 for (int i = 0;; i++)
1467 uschar buffer[1024];
1471 char *readline_line = NULL;
1474 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1475 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1476 p = US readline_line;
1481 /* readline() not in use */
1484 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1488 /* Handle the line */
1491 ss = p + Ustrlen(p);
1492 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1495 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1497 g = string_catn(g, p, ss - p);
1500 if (fn_readline) free(readline_line);
1503 /* g can only be NULL if ss==p */
1504 if (ss == p || gstring_last_char(g) != '\\') /* not continuation; done */
1507 gstring_trim(g, 1); /* drop the \ */
1510 if (had_input) return g ? string_from_gstring(g) : US"";
1517 /*************************************************
1518 * Output usage information for the program *
1519 *************************************************/
1521 /* This function is called when there are no recipients
1522 or a specific --help argument was added.
1525 progname information on what name we were called by
1527 Returns: DOES NOT RETURN
1531 exim_usage(uschar *progname)
1534 /* Handle specific program invocation variants */
1535 if (Ustrcmp(progname, US"-mailq") == 0)
1537 "mailq - list the contents of the mail queue\n\n"
1538 "For a list of options, see the Exim documentation.\n");
1540 /* Generic usage - we output this whatever happens */
1542 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1543 "not directly from a shell command line. Options and/or arguments control\n"
1544 "what it does when called. For a list of options, see the Exim documentation.\n");
1549 /*************************************************
1550 * Validate that the macros given are okay *
1551 *************************************************/
1553 /* Typically, Exim will drop privileges if macros are supplied. In some
1554 cases, we want to not do so.
1556 Arguments: opt_D_used - true if the commandline had a "-D" option
1557 Returns: true if trusted, false otherwise
1561 macros_trusted(BOOL opt_D_used)
1563 #ifdef WHITELIST_D_MACROS
1564 uschar *whitelisted, *end, *p, **whites;
1565 int white_count, i, n;
1567 BOOL prev_char_item, found;
1572 #ifndef WHITELIST_D_MACROS
1576 /* We only trust -D overrides for some invoking users:
1577 root, the exim run-time user, the optional config owner user.
1578 I don't know why config-owner would be needed, but since they can own the
1579 config files anyway, there's no security risk to letting them override -D. */
1580 if ( ! ((real_uid == root_uid)
1581 || (real_uid == exim_uid)
1582 #ifdef CONFIGURE_OWNER
1583 || (real_uid == config_uid)
1587 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1591 /* Get a list of macros which are whitelisted */
1592 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1593 prev_char_item = FALSE;
1595 for (p = whitelisted; *p != '\0'; ++p)
1597 if (*p == ':' || isspace(*p))
1602 prev_char_item = FALSE;
1605 if (!prev_char_item)
1606 prev_char_item = TRUE;
1613 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1614 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1619 if (i == white_count)
1621 while (*p != '\0' && p < end)
1627 /* The list of commandline macros should be very short.
1628 Accept the N*M complexity. */
1629 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1632 for (uschar ** w = whites; *w; ++w)
1633 if (Ustrcmp(*w, m->name) == 0)
1640 if (!m->replacement)
1642 if ((len = m->replen) == 0)
1644 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1647 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1653 /*************************************************
1654 * Expansion testing *
1655 *************************************************/
1657 /* Expand and print one item, doing macro-processing.
1660 item line for expansion
1664 expansion_test_line(const uschar * line)
1670 Ustrncpy(big_buffer, line, big_buffer_size);
1671 big_buffer[big_buffer_size-1] = '\0';
1672 len = Ustrlen(big_buffer);
1674 (void) macros_expand(0, &len, &dummy_macexp);
1676 if (isupper(big_buffer[0]))
1678 if (macro_read_assignment(big_buffer))
1679 printf("Defined macro '%s'\n", mlast->name);
1681 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1682 printf("%s\n", acl_standalone_setvar(big_buffer+4));
1684 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1685 else printf("Failed: %s\n", expand_string_message);
1690 /*************************************************
1691 * Queue-runner operations *
1692 *************************************************/
1694 /* Prefix a new qrunner descriptor to the qrunners list */
1699 qrunner * q = qrunners;
1700 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1701 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1703 qrunners->next_tick = time(NULL); /* run right away */
1708 alloc_onetime_qrunner(void)
1710 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1711 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1712 qrunners->next_tick = time(NULL); /* run right away */
1713 qrunners->run_max = 1;
1717 /*************************************************
1718 * Entry point and high-level code *
1719 *************************************************/
1721 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1722 the appropriate action. All the necessary functions are present in the one
1723 binary. I originally thought one should split it up, but it turns out that so
1724 much of the apparatus is needed in each chunk that one might as well just have
1725 it all available all the time, which then makes the coding easier as well.
1728 argc count of entries in argv
1729 argv argument strings, with argv[0] being the program name
1731 Returns: EXIT_SUCCESS if terminated successfully
1732 EXIT_FAILURE otherwise, except when a message has been sent
1733 to the sender, and -oee was given
1737 main(int argc, char **cargv)
1739 uschar **argv = USS cargv;
1740 int arg_receive_timeout = -1;
1741 int arg_smtp_receive_timeout = -1;
1742 int arg_error_handling = error_handling;
1743 int filter_sfd = -1;
1744 int filter_ufd = -1;
1747 int list_queue_option = 0;
1749 int msg_action_arg = -1;
1750 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1751 int queue_only_reason = 0;
1753 int perl_start_option = 0;
1755 int recipients_arg = argc;
1756 int sender_address_domain = 0;
1757 int test_retry_arg = -1;
1758 int test_rewrite_arg = -1;
1759 gid_t original_egid;
1760 BOOL arg_queue_only = FALSE;
1761 BOOL bi_option = FALSE;
1762 BOOL checking = FALSE;
1763 BOOL count_queue = FALSE;
1764 BOOL expansion_test = FALSE;
1765 BOOL extract_recipients = FALSE;
1766 BOOL flag_G = FALSE;
1767 BOOL flag_n = FALSE;
1768 BOOL forced_delivery = FALSE;
1769 BOOL f_end_dot = FALSE;
1770 BOOL deliver_give_up = FALSE;
1771 BOOL list_queue = FALSE;
1772 BOOL list_options = FALSE;
1773 BOOL list_config = FALSE;
1774 BOOL local_queue_only;
1775 BOOL one_msg_action = FALSE;
1776 BOOL opt_D_used = FALSE;
1777 BOOL queue_only_set = FALSE;
1778 BOOL receiving_message = TRUE;
1779 BOOL sender_ident_set = FALSE;
1780 BOOL session_local_queue_only;
1782 BOOL removed_privilege = FALSE;
1783 BOOL usage_wanted = FALSE;
1784 BOOL verify_address_mode = FALSE;
1785 BOOL verify_as_sender = FALSE;
1786 BOOL rcpt_verify_quota = FALSE;
1787 BOOL version_printed = FALSE;
1788 uschar *alias_arg = NULL;
1789 uschar *called_as = US"";
1790 uschar *cmdline_syslog_name = NULL;
1791 uschar *start_queue_run_id = NULL;
1792 uschar *stop_queue_run_id = NULL;
1793 uschar *expansion_test_message = NULL;
1794 const uschar *ftest_domain = NULL;
1795 const uschar *ftest_localpart = NULL;
1796 const uschar *ftest_prefix = NULL;
1797 const uschar *ftest_suffix = NULL;
1798 uschar *log_oneline = NULL;
1799 uschar *malware_test_file = NULL;
1800 uschar *real_sender_address;
1801 uschar *originator_home = US"/";
1805 struct stat statbuf;
1806 pid_t passed_qr_pid = (pid_t)0;
1807 int passed_qr_pipe = -1;
1808 gid_t group_list[EXIM_GROUPLIST_SIZE];
1810 /* For the -bI: flag */
1811 enum commandline_info info_flag = CMDINFO_NONE;
1812 BOOL info_stdout = FALSE;
1814 /* Possible options for -R and -S */
1816 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1818 /* Need to define this in case we need to change the environment in order
1819 to get rid of a bogus time zone. We have to make it char rather than uschar
1820 because some OS define it in /usr/include/unistd.h. */
1822 extern char **environ;
1824 #ifdef MEASURE_TIMING
1825 (void)gettimeofday(×tamp_startup, NULL);
1828 store_init(); /* Initialise the memory allocation susbsystem */
1829 pcre_init(); /* Set up memory handling for pcre */
1831 /* If the Exim user and/or group and/or the configuration file owner/group were
1832 defined by ref:name at build time, we must now find the actual uid/gid values.
1833 This is a feature to make the lives of binary distributors easier. */
1835 #ifdef EXIM_USERNAME
1836 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1839 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1841 /* If ref:name uses a number as the name, route_finduser() returns
1842 TRUE with exim_uid set and pw coerced to NULL. */
1844 exim_gid = pw->pw_gid;
1845 #ifndef EXIM_GROUPNAME
1848 "exim: ref:name should specify a usercode, not a group.\n"
1849 "exim: can't let you get away with it unless you also specify a group.\n");
1853 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1856 #ifdef EXIM_GROUPNAME
1857 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1858 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1861 #ifdef CONFIGURE_OWNERNAME
1862 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1863 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1864 CONFIGURE_OWNERNAME);
1867 /* We default the system_filter_user to be the Exim run-time user, as a
1868 sane non-root value. */
1869 system_filter_uid = exim_uid;
1871 #ifdef CONFIGURE_GROUPNAME
1872 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1873 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1874 CONFIGURE_GROUPNAME);
1877 /* In the Cygwin environment, some initialization used to need doing.
1878 It was fudged in by means of this macro; now no longer but we'll leave
1879 it in case of others. */
1885 /* Check a field which is patched when we are running Exim within its
1886 testing harness; do a fast initial check, and then the whole thing. */
1888 f.running_in_test_harness =
1889 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1890 if (f.running_in_test_harness)
1893 /* Protect against abusive argv[0] */
1894 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1895 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1897 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1898 at the start of a program; however, it seems that some environments do not
1899 follow this. A "strange" locale can affect the formatting of timestamps, so we
1902 setlocale(LC_ALL, "C");
1904 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1906 #ifdef _POSIX_MONOTONIC_CLOCK
1910 /* Set up the default handler for timing using alarm(). */
1912 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1914 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1915 because store_malloc writes a log entry on failure. */
1917 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1918 exim_fail("exim: failed to get store for log buffer\n");
1920 /* Initialize the default log options. */
1922 bits_set(log_selector, log_selector_size, log_default);
1924 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1925 NULL when the daemon is run and the file is closed. We have to use this
1926 indirection, because some systems don't allow writing to the variable "stderr".
1929 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1931 /* Ensure there is a big buffer for temporary use in several places. It is put
1932 in malloc store so that it can be freed for enlargement if necessary. */
1934 big_buffer = store_malloc(big_buffer_size);
1936 /* Set up the handler for the data request signal, and set the initial
1937 descriptive text. */
1939 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1940 set_process_info("initializing");
1941 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1944 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1945 sigaction(SIGSEGV, &act, NULL);
1948 signal(SIGSEGV, segv_handler); /* log faults */
1951 /* If running in a dockerized environment, the TERM signal is only
1952 delegated to the PID 1 if we request it by setting an signal handler */
1954 if (getpid() == 1) signal(SIGTERM, term_handler);
1956 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1957 in the daemon code. For the rest of Exim's uses, we ignore it. */
1959 signal(SIGHUP, SIG_IGN);
1961 /* We don't want to die on pipe errors as the code is written to handle
1962 the write error instead. */
1964 signal(SIGPIPE, SIG_IGN);
1966 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1967 set to SIG_IGN. This causes subprocesses that complete before the parent
1968 process waits for them not to hang around, so when Exim calls wait(), nothing
1969 is there. The wait() code has been made robust against this, but let's ensure
1970 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1971 ending status. We use sigaction rather than plain signal() on those OS where
1972 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1973 problem on AIX with this.) */
1977 struct sigaction act;
1978 act.sa_handler = SIG_DFL;
1979 sigemptyset(&(act.sa_mask));
1981 sigaction(SIGCHLD, &act, NULL);
1984 signal(SIGCHLD, SIG_DFL);
1987 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1992 /* Set up the version number. Set up the leading 'E' for the external form of
1993 message ids, set the pointer to the internal form, and initialize it to
1994 indicate no message being processed. */
1997 message_id_option[0] = '-';
1998 message_id_external = message_id_option + 1;
1999 message_id_external[0] = 'E';
2000 message_id = message_id_external + 1;
2003 /* Set the umask to zero so that any files Exim creates using open() are
2004 created with the modes that it specifies. NOTE: Files created with fopen() have
2005 a problem, which was not recognized till rather late (February 2006). With this
2006 umask, such files will be world writeable. (They are all content scanning files
2007 in the spool directory, which isn't world-accessible, so this is not a
2008 disaster, but it's untidy.) I don't want to change this overall setting,
2009 however, because it will interact badly with the open() calls. Instead, there's
2010 now a function called modefopen() that fiddles with the umask while calling
2015 /* Precompile the regular expression for matching a message id. Keep this in
2016 step with the code that generates ids in the accept.c module. We need to do
2017 this here, because the -M options check their arguments for syntactic validity
2018 using mac_ismsgid, which uses this. */
2021 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
2023 /* Precompile the regular expression that is used for matching an SMTP error
2024 code, possibly extended, at the start of an error message. Note that the
2025 terminating whitespace character is included. */
2028 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2031 #ifdef WHITELIST_D_MACROS
2032 /* Precompile the regular expression used to filter the content of macros
2033 given to -D for permissibility. */
2035 regex_whitelisted_macro =
2036 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2039 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2040 this seems to be a generally accepted convention, since one finds symbolic
2041 links called "mailq" in standard OS configurations. */
2043 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2044 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2047 receiving_message = FALSE;
2048 called_as = US"-mailq";
2051 /* If the program is called as "rmail" treat it as equivalent to
2052 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2053 i.e. preventing a single dot on a line from terminating the message, and
2054 returning with zero return code, even in cases of error (provided an error
2055 message has been sent). */
2057 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2058 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2061 called_as = US"-rmail";
2062 errors_sender_rc = EXIT_SUCCESS;
2065 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2066 this is a smail convention. */
2068 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2069 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2071 smtp_input = smtp_batched_input = TRUE;
2072 called_as = US"-rsmtp";
2075 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2076 this is a smail convention. */
2078 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2079 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2081 alloc_onetime_qrunner();
2082 receiving_message = FALSE;
2083 called_as = US"-runq";
2086 /* If the program is called as "newaliases" treat it as equivalent to
2087 "exim -bi"; this is a sendmail convention. */
2089 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2090 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2093 receiving_message = FALSE;
2094 called_as = US"-newaliases";
2097 /* Save the original effective uid for a couple of uses later. It should
2098 normally be root, but in some esoteric environments it may not be. */
2100 original_euid = geteuid();
2101 original_egid = getegid();
2103 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2104 to be the same as the real ones. This makes a difference only if Exim is setuid
2105 (or setgid) to something other than root, which could be the case in some
2106 special configurations. */
2108 real_uid = getuid();
2109 real_gid = getgid();
2111 if (real_uid == root_uid)
2113 if ((rv = setgid(real_gid)))
2114 exim_fail("exim: setgid(%ld) failed: %s\n",
2115 (long int)real_gid, strerror(errno));
2116 if ((rv = setuid(real_uid)))
2117 exim_fail("exim: setuid(%ld) failed: %s\n",
2118 (long int)real_uid, strerror(errno));
2121 /* If neither the original real uid nor the original euid was root, Exim is
2122 running in an unprivileged state. */
2124 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2126 /* For most of the args-parsing we need to use permanent pool memory */
2128 int old_pool = store_pool;
2129 store_pool = POOL_PERM;
2131 /* Scan the program's arguments. Some can be dealt with right away; others are
2132 simply recorded for checking and handling afterwards. Do a high-level switch
2133 on the second character (the one after '-'), to save some effort. */
2135 for (i = 1; i < argc; i++)
2137 BOOL badarg = FALSE;
2138 uschar * arg = argv[i];
2142 /* An argument not starting with '-' is the start of a recipients list;
2143 break out of the options-scanning loop. */
2151 /* An option consisting of -- terminates the options */
2153 if (Ustrcmp(arg, "--") == 0)
2155 recipients_arg = i + 1;
2159 /* Handle flagged options */
2161 switchchar = arg[1];
2164 /* Make all -ex options synonymous with -oex arguments, since that
2165 is assumed by various callers. Also make -qR options synonymous with -R
2166 options, as that seems to be required as well. Allow for -qqR too, and
2167 the same for -S options. */
2169 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2170 Ustrncmp(arg+1, "qR", 2) == 0 ||
2171 Ustrncmp(arg+1, "qS", 2) == 0)
2173 switchchar = arg[2];
2176 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2178 switchchar = arg[3];
2180 f.queue_2stage = TRUE;
2183 /* Make -r synonymous with -f, since it is a documented alias */
2185 else if (arg[1] == 'r') switchchar = 'f';
2187 /* Make -ov synonymous with -v */
2189 else if (Ustrcmp(arg, "-ov") == 0)
2195 /* deal with --option_aliases */
2196 else if (switchchar == '-')
2198 if (Ustrcmp(argrest, "help") == 0)
2200 usage_wanted = TRUE;
2203 else if (Ustrcmp(argrest, "version") == 0)
2210 /* High-level switch on active initial letter */
2215 /* sendmail uses -Ac and -Am to control which .cf file is used;
2218 if (!*argrest) { badarg = TRUE; break; }
2221 BOOL ignore = FALSE;
2226 if (*(argrest + 1) == '\0')
2230 if (!ignore) badarg = TRUE;
2234 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2235 so has no need of it. */
2238 if (!*argrest) i++; /* Skip over the type */
2244 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2248 /* -bd: Run in daemon mode, awaiting SMTP connections.
2249 -bdf: Ditto, but in the foreground.
2252 f.daemon_listen = f.daemon_scion = TRUE;
2253 if (*argrest == 'f') f.background_daemon = FALSE;
2254 else if (*argrest) badarg = TRUE;
2257 /* -be: Run in expansion test mode
2258 -bem: Ditto, but read a message from a file first
2261 expansion_test = checking = TRUE;
2262 if (*argrest == 'm')
2264 if (++i >= argc) { badarg = TRUE; break; }
2265 expansion_test_message = argv[i];
2268 if (*argrest) badarg = TRUE;
2271 /* -bF: Run system filter test */
2273 filter_test |= checking = FTEST_SYSTEM;
2274 if (*argrest) badarg = TRUE;
2275 else if (++i < argc) filter_test_sfile = argv[i];
2276 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2279 /* -bf: Run user filter test
2280 -bfd: Set domain for filter testing
2281 -bfl: Set local part for filter testing
2282 -bfp: Set prefix for filter testing
2283 -bfs: Set suffix for filter testing
2288 filter_test |= checking = FTEST_USER;
2289 if (++i < argc) filter_test_ufile = argv[i];
2290 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2295 exim_fail("exim: string expected after %s\n", arg);
2296 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2297 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2298 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2299 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2304 /* -bh: Host checking - an IP address must follow. */
2306 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2308 if (++i >= argc) { badarg = TRUE; break; }
2309 sender_host_address = string_copy_taint(
2310 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2312 host_checking = checking = f.log_testing_mode = TRUE;
2313 f.host_checking_callout = *argrest == 'c';
2314 message_logs = FALSE;
2319 /* -bi: This option is used by sendmail to initialize *the* alias file,
2320 though it has the -oA option to specify a different file. Exim has no
2321 concept of *the* alias file, but since Sun's YP make script calls
2322 sendmail this way, some support must be provided. */
2324 if (!*argrest) bi_option = TRUE;
2328 /* -bI: provide information, of the type to follow after a colon.
2329 This is an Exim flag. */
2331 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2333 uschar *p = argrest+1;
2334 info_flag = CMDINFO_HELP;
2336 if (strcmpic(p, CUS"sieve") == 0)
2338 info_flag = CMDINFO_SIEVE;
2341 else if (strcmpic(p, CUS"dscp") == 0)
2343 info_flag = CMDINFO_DSCP;
2346 else if (strcmpic(p, CUS"help") == 0)
2352 /* -bm: Accept and deliver message - the default option. Reinstate
2353 receiving_message, which got turned off for all -b options.
2354 -bmalware: test the filename given for malware */
2356 if (!*argrest) receiving_message = TRUE;
2357 else if (Ustrcmp(argrest, "alware") == 0)
2359 if (++i >= argc) { badarg = TRUE; break; }
2361 malware_test_file = argv[i];
2366 /* -bnq: For locally originating messages, do not qualify unqualified
2367 addresses. In the envelope, this causes errors; in header lines they
2370 if (Ustrcmp(argrest, "q") == 0)
2372 f.allow_unqualified_sender = FALSE;
2373 f.allow_unqualified_recipient = FALSE;
2378 /* -bpxx: List the contents of the mail queue, in various forms. If
2379 the option is -bpc, just a queue count is needed. Otherwise, if the
2380 first letter after p is r, then order is random. */
2382 if (*argrest == 'c')
2385 if (*++argrest) badarg = TRUE;
2389 if (*argrest == 'r')
2391 list_queue_option = 8;
2394 else list_queue_option = 0;
2398 /* -bp: List the contents of the mail queue, top-level only */
2402 /* -bpu: List the contents of the mail queue, top-level undelivered */
2404 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2406 /* -bpa: List the contents of the mail queue, including all delivered */
2408 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2410 /* Unknown after -bp[r] */
2416 /* -bP: List the configuration variables given as the address list.
2417 Force -v, so configuration errors get displayed. */
2420 /* -bP config: we need to setup here, because later,
2421 when list_options is checked, the config is read already */
2424 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2427 readconf_save_config(version_string);
2431 list_options = TRUE;
2432 debug_selector |= D_v;
2433 debug_file = stderr;
2437 /* -brt: Test retry configuration lookup */
2439 if (Ustrcmp(argrest, "t") == 0)
2442 test_retry_arg = i + 1;
2446 /* -brw: Test rewrite configuration */
2448 else if (Ustrcmp(argrest, "w") == 0)
2451 test_rewrite_arg = i + 1;
2457 /* -bS: Read SMTP commands on standard input, but produce no replies -
2458 all errors are reported by sending messages. */
2461 smtp_input = smtp_batched_input = receiving_message = TRUE;
2465 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2466 on standard output. */
2468 if (!*argrest) smtp_input = receiving_message = TRUE;
2472 /* -bt: address testing mode */
2475 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2479 /* -bv: verify addresses */
2482 verify_address_mode = checking = f.log_testing_mode = TRUE;
2484 /* -bvs: verify sender addresses */
2486 else if (Ustrcmp(argrest, "s") == 0)
2488 verify_address_mode = checking = f.log_testing_mode = TRUE;
2489 verify_as_sender = TRUE;
2494 /* -bV: Print version string and support details */
2498 printf("Exim version %s #%s built %s\n", version_string,
2499 version_cnumber, version_date);
2500 printf("%s\n", CS version_copyright);
2501 version_printed = TRUE;
2502 show_whats_supported(TRUE);
2503 f.log_testing_mode = TRUE;
2508 /* -bw: inetd wait mode, accept a listening socket as stdin */
2510 f.inetd_wait_mode = TRUE;
2511 f.background_daemon = FALSE;
2512 f.daemon_listen = f.daemon_scion = TRUE;
2514 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2515 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2526 /* -C: change configuration file list; ignore if it isn't really
2527 a change! Enforce a prefix check if required. */
2531 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2532 if (Ustrcmp(config_main_filelist, argrest) != 0)
2534 #ifdef ALT_CONFIG_PREFIX
2536 int len = Ustrlen(ALT_CONFIG_PREFIX);
2537 const uschar *list = argrest;
2539 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2540 while((filename = string_nextinlist(&list, &sep, big_buffer,
2542 if ( ( Ustrlen(filename) < len
2543 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2544 || Ustrstr(filename, "/../") != NULL
2546 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2548 exim_fail("-C Permission denied\n");
2550 if (real_uid != root_uid)
2552 #ifdef TRUSTED_CONFIG_LIST
2554 if (real_uid != exim_uid
2555 #ifdef CONFIGURE_OWNER
2556 && real_uid != config_uid
2559 f.trusted_config = FALSE;
2562 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2565 struct stat statbuf;
2567 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2568 (statbuf.st_uid != root_uid /* owner not root */
2569 #ifdef CONFIGURE_OWNER
2570 && statbuf.st_uid != config_uid /* owner not the special one */
2573 (statbuf.st_gid != root_gid /* group not root */
2574 #ifdef CONFIGURE_GROUP
2575 && statbuf.st_gid != config_gid /* group not the special one */
2577 && (statbuf.st_mode & 020) != 0 /* group writeable */
2579 (statbuf.st_mode & 2) != 0) /* world writeable */
2581 f.trusted_config = FALSE;
2586 /* Well, the trust list at least is up to scratch... */
2588 uschar *trusted_configs[32];
2591 int old_pool = store_pool;
2592 store_pool = POOL_MAIN;
2594 reset_point = store_mark();
2595 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2597 uschar *start = big_buffer, *nl;
2598 while (*start && isspace(*start))
2602 nl = Ustrchr(start, '\n');
2605 trusted_configs[nr_configs++] = string_copy(start);
2606 if (nr_configs == nelem(trusted_configs))
2614 const uschar *list = argrest;
2616 while (f.trusted_config && (filename = string_nextinlist(&list,
2617 &sep, big_buffer, big_buffer_size)))
2619 for (i=0; i < nr_configs; i++)
2620 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2622 if (i == nr_configs)
2624 f.trusted_config = FALSE;
2629 else /* No valid prefixes found in trust_list file. */
2630 f.trusted_config = FALSE;
2631 store_reset(reset_point);
2632 store_pool = old_pool;
2635 else /* Could not open trust_list file. */
2636 f.trusted_config = FALSE;
2639 /* Not root; don't trust config */
2640 f.trusted_config = FALSE;
2644 config_main_filelist = argrest;
2645 f.config_changed = TRUE;
2650 /* -D: set up a macro definition */
2653 #ifdef DISABLE_D_OPTION
2654 exim_fail("exim: -D is not available in this Exim binary\n");
2660 uschar *s = argrest;
2663 while (isspace(*s)) s++;
2665 if (*s < 'A' || *s > 'Z')
2666 exim_fail("exim: macro name set by -D must start with "
2667 "an upper case letter\n");
2669 while (isalnum(*s) || *s == '_')
2671 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2675 if (ptr == 0) { badarg = TRUE; break; }
2676 while (isspace(*s)) s++;
2679 if (*s++ != '=') { badarg = TRUE; break; }
2680 while (isspace(*s)) s++;
2683 for (m = macros_user; m; m = m->next)
2684 if (Ustrcmp(m->name, name) == 0)
2685 exim_fail("exim: duplicated -D in command line\n");
2687 m = macro_create(name, s, TRUE);
2689 if (clmacro_count >= MAX_CLMACROS)
2690 exim_fail("exim: too many -D options on command line\n");
2691 clmacros[clmacro_count++] =
2692 string_sprintf("-D%s=%s", m->name, m->replacement);
2699 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2701 if (Ustrcmp(argrest, "ropcr") == 0)
2703 /* drop_cr = TRUE; */
2706 /* -dp: Set up a debug pretrigger buffer with given size. */
2708 else if (Ustrcmp(argrest, "p") == 0)
2712 debug_pretrigger_setup(argv[i]);
2714 /* -dt: Set a debug trigger selector */
2716 else if (Ustrncmp(argrest, "t=", 2) == 0)
2717 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2719 /* -d: Set debug level (see also -v below).
2720 If -dd is used, debugging subprocesses of the daemon is disabled. */
2724 /* Use an intermediate variable so that we don't set debugging while
2725 decoding the debugging bits. */
2727 unsigned int selector = D_default;
2730 if (*argrest == 'd')
2732 f.debug_daemon = TRUE;
2736 decode_bits(&selector, 1, debug_notall, argrest,
2737 debug_options, debug_options_count, US"debug", 0);
2738 debug_selector = selector;
2743 /* -E: This is a local error message. This option is not intended for
2744 external use at all, but is not restricted to trusted callers because it
2745 does no harm (just suppresses certain error messages) and if Exim is run
2746 not setuid root it won't always be trusted when it generates error
2747 messages using this option. If there is a message id following -E, point
2748 message_reference at it, for logging. */
2751 f.local_error_message = TRUE;
2752 if (mac_ismsgid(argrest)) message_reference = argrest;
2756 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2757 option, so it looks as if historically the -oex options are also callable
2758 without the leading -o. So we have to accept them. Before the switch,
2759 anything starting -oe has been converted to -e. Exim does not support all
2760 of the sendmail error options. */
2763 if (Ustrcmp(argrest, "e") == 0)
2765 arg_error_handling = ERRORS_SENDER;
2766 errors_sender_rc = EXIT_SUCCESS;
2768 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2769 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2770 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2771 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2776 /* -F: Set sender's full name, used instead of the gecos entry from
2777 the password file. Since users can usually alter their gecos entries,
2778 there's no security involved in using this instead. The data can follow
2779 the -F or be in the next argument. */
2783 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2784 originator_name = string_copy_taint(
2785 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2787 f.sender_name_forced = TRUE;
2791 /* -f: Set sender's address - this value is only actually used if Exim is
2792 run by a trusted user, or if untrusted_set_sender is set and matches the
2793 address, except that the null address can always be set by any user. The
2794 test for this happens later, when the value given here is ignored when not
2795 permitted. For an untrusted user, the actual sender is still put in Sender:
2796 if it doesn't match the From: header (unless no_local_from_check is set).
2797 The data can follow the -f or be in the next argument. The -r switch is an
2798 obsolete form of -f but since there appear to be programs out there that
2799 use anything that sendmail has ever supported, better accept it - the
2800 synonymizing is done before the switch above.
2802 At this stage, we must allow domain literal addresses, because we don't
2803 know what the setting of allow_domain_literals is yet. Ditto for trailing
2804 dots and strip_trailing_dot. */
2808 int dummy_start, dummy_end;
2811 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2812 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2814 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2817 uschar * temp = argrest + Ustrlen(argrest) - 1;
2818 while (temp >= argrest && isspace(*temp)) temp--;
2819 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2820 allow_domain_literals = TRUE;
2821 strip_trailing_dot = TRUE;
2823 allow_utf8_domains = TRUE;
2825 if (!(sender_address = parse_extract_address(argrest, &errmess,
2826 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2827 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2829 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2831 message_smtputf8 = string_is_utf8(sender_address);
2832 allow_utf8_domains = FALSE;
2834 allow_domain_literals = FALSE;
2835 strip_trailing_dot = FALSE;
2837 f.sender_address_forced = TRUE;
2841 /* -G: sendmail invocation to specify that it's a gateway submission and
2842 sendmail may complain about problems instead of fixing them.
2843 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2844 not at this time complain about problems. */
2850 /* -h: Set the hop count for an incoming message. Exim does not currently
2851 support this; it always computes it by counting the Received: headers.
2852 To put it in will require a change to the spool header file format. */
2856 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2857 if (!isdigit(*argrest)) badarg = TRUE;
2861 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2862 not to be documented for sendmail but mailx (at least) uses it) */
2865 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2869 /* -L: set the identifier used for syslog; equivalent to setting
2870 syslog_processname in the config file, but needs to be an admin option. */
2874 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2875 if ((sz = Ustrlen(argrest)) > 32)
2876 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2878 exim_fail("exim: the -L syslog name is too short\n");
2879 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2883 receiving_message = FALSE;
2885 /* -MC: continue delivery of another message via an existing open
2886 file descriptor. This option is used for an internal call by the
2887 smtp transport when there is a pending message waiting to go to an
2888 address to which it has got a connection. Five subsequent arguments are
2889 required: transport name, host name, IP address, sequence number, and
2890 message_id. Transports may decline to create new processes if the sequence
2891 number gets too big. The channel is stdin. This (-MC) must be the last
2892 argument. There's a subsequent check that the real-uid is privileged.
2894 If we are running in the test harness. delay for a bit, to let the process
2895 that set this one up complete. This makes for repeatability of the logging,
2898 if (Ustrcmp(argrest, "C") == 0)
2900 union sockaddr_46 interface_sock;
2901 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2904 exim_fail("exim: too many or too few arguments after -MC\n");
2906 if (msg_action_arg >= 0)
2907 exim_fail("exim: incompatible arguments\n");
2909 continue_transport = string_copy_taint(
2910 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2912 continue_hostname = string_copy_taint(
2913 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2915 continue_host_address = string_copy_taint(
2916 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2918 continue_sequence = Uatoi(argv[++i]);
2919 msg_action = MSG_DELIVER;
2920 msg_action_arg = ++i;
2921 forced_delivery = TRUE;
2922 queue_run_pid = passed_qr_pid;
2923 queue_run_pipe = passed_qr_pipe;
2925 if (!mac_ismsgid(argv[i]))
2926 exim_fail("exim: malformed message id %s after -MC option\n",
2929 /* Set up $sending_ip_address and $sending_port, unless proxied */
2931 if (!continue_proxy_cipher)
2932 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2934 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2937 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2940 testharness_pause_ms(500);
2944 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2948 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2949 precedes -MC (see above). The flag indicates that the host to which
2950 Exim is connected has accepted an AUTH sequence. */
2952 case 'A': f.smtp_authenticated = TRUE; break;
2954 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2955 that exim is connected to supports the esmtp extension DSN */
2957 case 'D': smtp_peer_options |= OPTION_DSN; break;
2959 /* -MCd: for debug, set a process-purpose string */
2961 case 'd': if (++i < argc)
2962 process_purpose = string_copy_taint(
2963 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2968 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2969 from the commandline should be tainted - but we will need an untainted
2970 value for the spoolfile when doing a -odi delivery process. */
2972 case 'G': if (++i < argc) queue_name = string_copy_taint(
2973 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2978 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2980 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2982 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2983 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2984 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2986 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2988 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2993 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2994 it preceded -MC (see above) */
2996 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2998 #ifdef SUPPORT_SOCKS
2999 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3000 case 'p': proxy_session = TRUE;
3003 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3006 proxy_local_port = Uatoi(argv[i]);
3009 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3012 proxy_external_port = Uatoi(argv[i]);
3018 /* -MCQ: pass on the pid of the queue-running process that started
3019 this chain of deliveries and the fd of its synchronizing pipe; this
3020 is useful only when it precedes -MC (see above) */
3022 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3024 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3028 /* -MCq: do a quota check on the given recipient for the given size
3029 of message. Separate from -MC. */
3030 case 'q': rcpt_verify_quota = TRUE;
3031 if (++i < argc) message_size = Uatoi(argv[i]);
3035 /* -MCS: set the smtp_use_size flag; this is useful only when it
3036 precedes -MC (see above) */
3038 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3041 /* -MCs: used with -MCt; SNI was sent */
3042 /* -MCr: ditto, DANE */
3045 case 's': if (++i < argc)
3047 continue_proxy_sni = string_copy_taint(
3048 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3050 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3055 /* -MCt: similar to -MCT below but the connection is still open
3056 via a proxy process which handles the TLS context and coding.
3057 Require three arguments for the proxied local address and port,
3058 and the TLS cipher. */
3060 case 't': if (++i < argc)
3061 sending_ip_address = string_copy_taint(
3062 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3066 sending_port = (int)(Uatol(argv[i]));
3069 continue_proxy_cipher = string_copy_taint(
3070 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3075 /* -MCT: set the tls_offered flag; this is useful only when it
3076 precedes -MC (see above). The flag indicates that the host to which
3077 Exim is connected has offered TLS support. */
3079 case 'T': smtp_peer_options |= OPTION_TLS; break;
3082 default: badarg = TRUE; break;
3087 /* -M[x]: various operations on the following list of message ids:
3088 -M deliver the messages, ignoring next retry times and thawing
3089 -Mc deliver the messages, checking next retry times, no thawing
3090 -Mf freeze the messages
3091 -Mg give up on the messages
3092 -Mt thaw the messages
3093 -Mrm remove the messages
3094 In the above cases, this must be the last option. There are also the
3095 following options which are followed by a single message id, and which
3096 act on that message. Some of them use the "recipient" addresses as well.
3097 -Mar add recipient(s)
3098 -MG move to a different queue
3099 -Mmad mark all recipients delivered
3100 -Mmd mark recipients(s) delivered
3102 -Mset load a message for use with -be
3104 -Mvc show copy (of whole message, in RFC 2822 format)
3111 msg_action = MSG_DELIVER;
3112 forced_delivery = f.deliver_force_thaw = TRUE;
3114 else if (Ustrcmp(argrest, "ar") == 0)
3116 msg_action = MSG_ADD_RECIPIENT;
3117 one_msg_action = TRUE;
3119 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3120 else if (Ustrcmp(argrest, "es") == 0)
3122 msg_action = MSG_EDIT_SENDER;
3123 one_msg_action = TRUE;
3125 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3126 else if (Ustrcmp(argrest, "g") == 0)
3128 msg_action = MSG_DELIVER;
3129 deliver_give_up = TRUE;
3131 else if (Ustrcmp(argrest, "G") == 0)
3133 msg_action = MSG_SETQUEUE;
3134 queue_name_dest = string_copy_taint(
3135 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3138 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3139 else if (Ustrcmp(argrest, "md") == 0)
3141 msg_action = MSG_MARK_DELIVERED;
3142 one_msg_action = TRUE;
3144 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3145 else if (Ustrcmp(argrest, "set") == 0)
3147 msg_action = MSG_LOAD;
3148 one_msg_action = TRUE;
3150 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3151 else if (Ustrcmp(argrest, "vb") == 0)
3153 msg_action = MSG_SHOW_BODY;
3154 one_msg_action = TRUE;
3156 else if (Ustrcmp(argrest, "vc") == 0)
3158 msg_action = MSG_SHOW_COPY;
3159 one_msg_action = TRUE;
3161 else if (Ustrcmp(argrest, "vh") == 0)
3163 msg_action = MSG_SHOW_HEADER;
3164 one_msg_action = TRUE;
3166 else if (Ustrcmp(argrest, "vl") == 0)
3168 msg_action = MSG_SHOW_LOG;
3169 one_msg_action = TRUE;
3171 else { badarg = TRUE; break; }
3173 /* All the -Mxx options require at least one message id. */
3175 msg_action_arg = i + 1;
3176 if (msg_action_arg >= argc)
3177 exim_fail("exim: no message ids given after %s option\n", arg);
3179 /* Some require only message ids to follow */
3181 if (!one_msg_action)
3183 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3184 exim_fail("exim: malformed message id %s after %s option\n",
3186 goto END_ARG; /* Remaining args are ids */
3189 /* Others require only one message id, possibly followed by addresses,
3190 which will be handled as normal arguments. */
3194 if (!mac_ismsgid(argv[msg_action_arg]))
3195 exim_fail("exim: malformed message id %s after %s option\n",
3196 argv[msg_action_arg], arg);
3202 /* Some programs seem to call the -om option without the leading o;
3203 for sendmail it askes for "me too". Exim always does this. */
3206 if (*argrest) badarg = TRUE;
3210 /* -N: don't do delivery - a debugging option that stops transports doing
3211 their thing. It implies debugging at the D_v level. */
3216 f.dont_deliver = TRUE;
3217 debug_selector |= D_v;
3218 debug_file = stderr;
3224 /* -n: This means "don't alias" in sendmail, apparently.
3225 For normal invocations, it has no effect.
3226 It may affect some other options. */
3232 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3233 option to the specified value. This form uses long names. We need to handle
3234 -O option=value and -Ooption=value. */
3239 exim_fail("exim: string expected after -O\n");
3245 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3248 if (!*(alias_arg = argrest))
3249 if (i+1 < argc) alias_arg = argv[++i];
3250 else exim_fail("exim: string expected after -oA\n");
3253 /* -oB: Set a connection message max value for remote deliveries */
3256 uschar * p = argrest;
3258 if (i+1 < argc && isdigit((argv[i+1][0])))
3262 connection_max_messages = 1;
3269 exim_fail("exim: number expected after -oB\n");
3270 connection_max_messages = Uatoi(p);
3275 /* -odb: background delivery */
3278 if (Ustrcmp(argrest, "b") == 0)
3280 f.synchronous_delivery = FALSE;
3281 arg_queue_only = FALSE;
3282 queue_only_set = TRUE;
3285 /* -odd: testsuite-only: add no inter-process delays */
3287 else if (Ustrcmp(argrest, "d") == 0)
3288 f.testsuite_delays = FALSE;
3290 /* -odf: foreground delivery (smail-compatible option); same effect as
3291 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3294 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3296 f.synchronous_delivery = TRUE;
3297 arg_queue_only = FALSE;
3298 queue_only_set = TRUE;
3301 /* -odq: queue only */
3303 else if (Ustrcmp(argrest, "q") == 0)
3305 f.synchronous_delivery = FALSE;
3306 arg_queue_only = TRUE;
3307 queue_only_set = TRUE;
3310 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3311 but no remote delivery */
3313 else if (Ustrcmp(argrest, "qs") == 0)
3315 f.queue_smtp = TRUE;
3316 arg_queue_only = FALSE;
3317 queue_only_set = TRUE;
3322 /* -oex: Sendmail error flags. As these are also accepted without the
3323 leading -o prefix, for compatibility with vacation and other callers,
3324 they are handled with -e above. */
3326 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3327 -oitrue: Another sendmail syntax for the same */
3330 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3335 /* -oM*: Set various characteristics for an incoming message; actually
3336 acted on for trusted callers only. */
3341 exim_fail("exim: data expected after -oM%s\n", argrest);
3343 /* -oMa: Set sender host address */
3345 if (Ustrcmp(argrest, "a") == 0)
3346 sender_host_address = string_copy_taint(
3347 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3350 /* -oMaa: Set authenticator name */
3352 else if (Ustrcmp(argrest, "aa") == 0)
3353 sender_host_authenticated = string_copy_taint(
3354 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3357 /* -oMas: setting authenticated sender */
3359 else if (Ustrcmp(argrest, "as") == 0)
3360 authenticated_sender = string_copy_taint(
3361 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3364 /* -oMai: setting authenticated id */
3366 else if (Ustrcmp(argrest, "ai") == 0)
3367 authenticated_id = string_copy_taint(
3368 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMai"),
3371 /* -oMi: Set incoming interface address */
3373 else if (Ustrcmp(argrest, "i") == 0)
3374 interface_address = string_copy_taint(
3375 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3378 /* -oMm: Message reference */
3380 else if (Ustrcmp(argrest, "m") == 0)
3382 if (!mac_ismsgid(argv[i+1]))
3383 exim_fail("-oMm must be a valid message ID\n");
3384 if (!f.trusted_config)
3385 exim_fail("-oMm must be called by a trusted user/config\n");
3386 message_reference = argv[++i];
3389 /* -oMr: Received protocol */
3391 else if (Ustrcmp(argrest, "r") == 0)
3393 if (received_protocol)
3394 exim_fail("received_protocol is set already\n");
3396 received_protocol = string_copy_taint(
3397 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3400 /* -oMs: Set sender host name */
3402 else if (Ustrcmp(argrest, "s") == 0)
3403 sender_host_name = string_copy_taint(
3404 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3407 /* -oMt: Set sender ident */
3409 else if (Ustrcmp(argrest, "t") == 0)
3411 sender_ident_set = TRUE;
3412 sender_ident = string_copy_taint(
3413 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3417 /* Else a bad argument */
3424 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3425 seem to call this as -m (undocumented), so that is also accepted (see
3427 /* -oo: An ancient flag for old-style addresses which still seems to
3428 crop up in some calls (see in SCO). */
3432 if (*argrest) badarg = TRUE;
3435 /* -oP <name>: set pid file path for daemon
3436 -oPX: delete pid file of daemon */
3439 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3440 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3441 "(uid=%d euid=%d | %d)\n",
3442 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3443 if (!*argrest) override_pid_file_path = argv[++i];
3444 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3449 /* -or <n>: set timeout for non-SMTP acceptance
3450 -os <n>: set timeout for SMTP acceptance */
3455 int * tp = argrest[-1] == 'r'
3456 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3458 *tp = readconf_readtime(argrest, 0, FALSE);
3459 else if (i+1 < argc)
3460 *tp = readconf_readtime(argv[++i], 0, FALSE);
3463 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3467 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3468 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3471 if (*argrest) badarg = TRUE;
3472 else override_local_interfaces = string_copy_taint(
3473 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3477 /* -oY: Override creation of daemon notifier socket */
3480 if (*argrest) badarg = TRUE;
3481 else f.notifier_socket_en = FALSE;
3484 /* Unknown -o argument */
3492 /* -ps: force Perl startup; -pd force delayed Perl startup */
3496 if (*argrest == 's' && argrest[1] == 0)
3498 perl_start_option = 1;
3501 if (*argrest == 'd' && argrest[1] == 0)
3503 perl_start_option = -1;
3508 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3509 which sets the host protocol and host name */
3512 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3516 uschar * hn = Ustrchr(argrest, ':');
3518 if (received_protocol)
3519 exim_fail("received_protocol is set already\n");
3522 received_protocol = string_copy_taint(
3523 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3527 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3528 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3529 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3534 /* -q: set up queue runs */
3538 BOOL two_stage, first_del, force, thaw = FALSE, local;
3540 receiving_message = FALSE;
3542 /* -qq...: Do queue runs in a 2-stage manner */
3544 if ((two_stage = *argrest == 'q'))
3547 /* -qi...: Do only first (initial) deliveries */
3549 if ((first_del = *argrest == 'i'))
3552 /* -qf...: Run the queue, forcing deliveries
3553 -qff..: Ditto, forcing thawing as well */
3555 if ((force = *argrest == 'f'))
3556 if ((thaw = *++argrest == 'f'))
3559 /* -q[f][f]l...: Run the queue only on local deliveries */
3561 if ((local = *argrest == 'l'))
3564 /* -q[f][f][l][G<name>]... Work on the named queue */
3566 if (*argrest == 'G')
3569 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3570 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3571 queue_name = string_copyn(argrest, i);
3573 if (*argrest == '/') argrest++;
3576 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3577 only, optionally named, optionally starting from a given message id. */
3579 if (!(list_queue || count_queue))
3584 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3586 q = alloc_onetime_qrunner();
3587 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3588 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3589 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3590 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3593 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3594 forced, optionally local only, optionally named. */
3598 int intvl = readconf_readtime(*argrest ? argrest : argv[++i], 0, FALSE);
3600 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3602 for (qrunner * qq = qrunners; qq; qq = qq->next)
3603 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3604 || !queue_name && !qq->name)
3605 exim_fail("exim: queue-runner specified more than once\n");
3607 q = alloc_qrunner();
3608 q->interval = intvl;
3611 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3612 q->queue_run_force = force;
3613 q->deliver_force_thaw = thaw;
3614 q->queue_run_first_delivery = first_del;
3615 q->queue_run_local = local;
3616 q->queue_2stage = two_stage;
3623 case 'R': /* Synonymous with -qR... */
3624 case 'S': /* Synonymous with -qS... */
3626 const uschar * tainted_selectstr;
3629 receiving_message = FALSE;
3631 /* -Rf: As -R (below) but force all deliveries,
3632 -Rff: Ditto, but also thaw all frozen messages,
3633 -Rr: String is regex
3634 -Rrf: Regex and force
3635 -Rrff: Regex and force and thaw
3637 -S...: Like -R but works on sender.
3639 in all cases provided there are no further characters in this
3642 alloc_onetime_qrunner();
3643 qrunners->queue_2stage = f.queue_2stage;
3645 for (int i = 0; i < nelem(rsopts); i++)
3646 if (Ustrcmp(argrest, rsopts[i]) == 0)
3648 if (i != 2) qrunners->queue_run_force = TRUE;
3650 if (switchchar == 'R')
3651 f.deliver_selectstring_regex = TRUE;
3653 f.deliver_selectstring_sender_regex = TRUE;
3654 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3655 argrest += Ustrlen(rsopts[i]);
3658 /* -R or -S: Set string to match in addresses for forced queue run to
3659 pick out particular messages. */
3661 /* Avoid attacks from people providing very long strings, and do so before
3664 tainted_selectstr = argrest;
3665 else if (i+1 < argc)
3666 tainted_selectstr = argv[++i];
3668 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3670 s = string_copy_taint(
3671 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3674 if (switchchar == 'R')
3675 deliver_selectstring = s;
3677 deliver_selectstring_sender = s;
3682 /* -r: an obsolete synonym for -f (see above) */
3684 /* -Tqt is an option that is exclusively for use by the testing suite.
3685 It is not recognized in other circumstances. It allows for the setting up
3686 of explicit "queue times" so that various warning/retry things can be
3687 tested. Otherwise variability of clock ticks etc. cause problems. */
3690 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3691 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3696 /* -t: Set flag to extract recipients from body of message. */
3699 if (!*argrest) extract_recipients = TRUE;
3701 /* -ti: Set flag to extract recipients from body of message, and also
3702 specify that dot does not end the message. */
3704 else if (Ustrcmp(argrest, "i") == 0)
3706 extract_recipients = TRUE;
3710 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3713 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3720 /* -U: This means "initial user submission" in sendmail, apparently. The
3721 doc claims that in future sendmail may refuse syntactically invalid
3722 messages instead of fixing them. For the moment, we just ignore it. */
3728 /* -v: verify things - this is a very low-level debugging */
3733 debug_selector |= D_v;
3734 debug_file = stderr;
3740 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3742 The -x flag tells the sendmail command that mail from a local
3743 mail program has National Language Support (NLS) extended characters
3744 in the body of the mail item. The sendmail command can send mail with
3745 extended NLS characters across networks that normally corrupts these
3748 As Exim is 8-bit clean, it just ignores this flag. */
3751 if (*argrest) badarg = TRUE;
3754 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3755 logs to that file. We swallow the parameter and otherwise ignore it. */
3760 exim_fail("exim: string expected after -X\n");
3763 /* -z: a line of text to log */
3768 log_oneline = string_copy_taint(
3769 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3772 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3775 /* All other initial characters are errors */
3780 } /* End of high-level switch statement */
3782 /* Failed to recognize the option, or syntax error */
3785 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3786 "option %s\n", arg);
3790 /* If -R or -S have been specified without -q, assume a single queue run. */
3792 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3793 alloc_onetime_qrunner();
3797 store_pool = old_pool;
3800 /* If usage_wanted is set we call the usage function - which never returns */
3801 if (usage_wanted) exim_usage(called_as);
3803 /* Arguments have been processed. Check for incompatibilities. */
3804 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3805 && ( f.daemon_listen || qrunners || bi_option
3806 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3807 || filter_test != FTEST_NONE
3808 || msg_action_arg > 0 && !one_msg_action
3810 || ( msg_action_arg > 0
3811 && ( f.daemon_listen || is_multiple_qrun() || list_options
3812 || checking && msg_action != MSG_LOAD
3813 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3815 || ( (f.daemon_listen || is_multiple_qrun())
3816 && ( sender_address || list_options || list_queue || checking
3819 || f.daemon_listen && is_onetime_qrun()
3820 || f.inetd_wait_mode && qrunners
3822 && ( checking || smtp_input || extract_recipients
3823 || filter_test != FTEST_NONE || bi_option
3825 || ( verify_address_mode
3826 && ( f.address_test_mode || smtp_input || extract_recipients
3827 || filter_test != FTEST_NONE || bi_option
3829 || ( f.address_test_mode
3830 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3834 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3836 || deliver_selectstring && !qrunners
3837 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3839 exim_fail("exim: incompatible command-line options or arguments\n");
3841 /* If debugging is set up, set the file and the file descriptor to pass on to
3842 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3843 to run in the foreground. */
3845 if (debug_selector != 0)
3847 debug_file = stderr;
3848 debug_fd = fileno(debug_file);
3849 f.background_daemon = FALSE;
3850 testharness_pause_ms(100); /* lets caller finish */
3851 if (debug_selector != D_v) /* -v only doesn't show this */
3853 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3854 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3856 if (!version_printed)
3857 show_whats_supported(FALSE);
3861 /* When started with root privilege, ensure that the limits on the number of
3862 open files and the number of processes (where that is accessible) are
3863 sufficiently large, or are unset, in case Exim has been called from an
3864 environment where the limits are screwed down. Not all OS have the ability to
3865 change some of these limits. */
3869 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3875 #ifdef RLIMIT_NOFILE
3876 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3878 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3880 rlp.rlim_cur = rlp.rlim_max = 0;
3883 /* I originally chose 1000 as a nice big number that was unlikely to
3884 be exceeded. It turns out that some older OS have a fixed upper limit of
3887 if (rlp.rlim_cur < 1000)
3889 rlp.rlim_cur = rlp.rlim_max = 1000;
3890 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3892 rlp.rlim_cur = rlp.rlim_max = 256;
3893 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3894 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3901 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3903 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3905 rlp.rlim_cur = rlp.rlim_max = 0;
3908 # ifdef RLIM_INFINITY
3909 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3911 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3913 if (rlp.rlim_cur < 1000)
3915 rlp.rlim_cur = rlp.rlim_max = 1000;
3917 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3918 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3924 /* Exim is normally entered as root (but some special configurations are
3925 possible that don't do this). However, it always spins off sub-processes that
3926 set their uid and gid as required for local delivery. We don't want to pass on
3927 any extra groups that root may belong to, so we want to get rid of them all at
3930 We need to obey setgroups() at this stage, before possibly giving up root
3931 privilege for a changed configuration file, but later on we might need to
3932 check on the additional groups for the admin user privilege - can't do that
3933 till after reading the config, which might specify the exim gid. Therefore,
3934 save the group list here first. */
3936 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3937 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3939 /* There is a fundamental difference in some BSD systems in the matter of
3940 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3941 known not to be different. On the "different" systems there is a single group
3942 list, and the first entry in it is the current group. On all other versions of
3943 Unix there is a supplementary group list, which is in *addition* to the current
3944 group. Consequently, to get rid of all extraneous groups on a "standard" system
3945 you pass over 0 groups to setgroups(), while on a "different" system you pass
3946 over a single group - the current group, which is always the first group in the
3947 list. Calling setgroups() with zero groups on a "different" system results in
3948 an error return. The following code should cope with both types of system.
3950 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3951 the "setgroups() with zero groups" - and changes the egid.
3952 Thanks to that we had to stash the original_egid above, for use below
3953 in the call to exim_setugid().
3955 However, if this process isn't running as root, setgroups() can't be used
3956 since you have to be root to run it, even if throwing away groups.
3957 Except, sigh, for Hurd - where you can.
3958 Not being root here happens only in some unusual configurations. */
3961 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3962 && setgroups(0, NULL) != 0
3964 && setgroups(1, group_list) != 0)
3965 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3967 /* If the configuration file name has been altered by an argument on the
3968 command line (either a new file name or a macro definition) and the caller is
3969 not root, or if this is a filter testing run, remove any setuid privilege the
3970 program has and run as the underlying user.
3972 The exim user is locked out of this, which severely restricts the use of -C
3975 Otherwise, set the real ids to the effective values (should be root unless run
3976 from inetd, which it can either be root or the exim uid, if one is configured).
3978 There is a private mechanism for bypassing some of this, in order to make it
3979 possible to test lots of configurations automatically, without having either to
3980 recompile each time, or to patch in an actual configuration file name and other
3981 values (such as the path name). If running in the test harness, pretend that
3982 configuration file changes and macro definitions haven't happened. */
3985 (!f.trusted_config || /* Config changed, or */
3986 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3987 real_uid != root_uid && /* Not root, and */
3988 !f.running_in_test_harness /* Not fudged */
3990 expansion_test /* expansion testing */
3992 filter_test != FTEST_NONE) /* Filter testing */
3994 setgroups(group_count, group_list);
3995 exim_setugid(real_uid, real_gid, FALSE,
3996 US"-C, -D, -be or -bf forces real uid");
3997 removed_privilege = TRUE;
3999 /* In the normal case when Exim is called like this, stderr is available
4000 and should be used for any logging information because attempts to write
4001 to the log will usually fail. To arrange this, we unset really_exim. However,
4002 if no stderr is available there is no point - we might as well have a go
4003 at the log (if it fails, syslog will be written).
4005 Note that if the invoker is Exim, the logs remain available. Messing with
4006 this causes unlogged successful deliveries. */
4008 if (log_stderr && real_uid != exim_uid)
4009 f.really_exim = FALSE;
4012 /* Privilege is to be retained for the moment. It may be dropped later,
4013 depending on the job that this Exim process has been asked to do. For now, set
4014 the real uid to the effective so that subsequent re-execs of Exim are done by a
4018 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4020 /* If testing a filter, open the file(s) now, before wasting time doing other
4021 setups and reading the message. */
4023 if (filter_test & FTEST_SYSTEM)
4024 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4025 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4028 if (filter_test & FTEST_USER)
4029 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4030 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4033 /* Initialise lookup_list
4034 If debugging, already called above via version reporting.
4035 In either case, we initialise the list of available lookups while running
4036 as root. All dynamically modules are loaded from a directory which is
4037 hard-coded into the binary and is code which, if not a module, would be
4038 part of Exim already. Ability to modify the content of the directory
4039 is equivalent to the ability to modify a setuid binary!
4041 This needs to happen before we read the main configuration. */
4044 /*XXX this excrescence could move to the testsuite standard config setup file */
4046 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4049 /* Read the main runtime configuration data; this gives up if there
4050 is a failure. It leaves the configuration file open so that the subsequent
4051 configuration data for delivery can be read if needed.
4053 NOTE: immediately after opening the configuration file we change the working
4054 directory to "/"! Later we change to $spool_directory. We do it there, because
4055 during readconf_main() some expansion takes place already. */
4057 /* Store the initial cwd before we change directories. Can be NULL if the
4058 dir has already been unlinked. */
4059 initial_cwd = os_getcwd(NULL, 0);
4060 if (!initial_cwd && errno)
4061 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4063 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4064 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4067 -be[m] expansion test -
4068 -b[fF] filter test new
4070 -bmalware malware_test_file new
4072 -brw rewrite test new
4074 -bv[s] address verify -
4076 -bP <option> (except -bP config, which sets list_config)
4078 If any of these options is set, we suppress warnings about configuration
4079 issues (currently about tls_advertise_hosts and keep_environment not being
4083 int old_pool = store_pool;
4084 #ifdef MEASURE_TIMING
4086 (void)gettimeofday(&t0, NULL);
4089 store_pool = POOL_CONFIG;
4090 readconf_main(checking || list_options);
4091 store_pool = old_pool;
4093 #ifdef MEASURE_TIMING
4094 report_time_since(&t0, US"readconf_main (delta)");
4098 /* Now in directory "/" */
4100 if (cleanup_environment() == FALSE)
4101 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4104 /* If an action on specific messages is requested, or if a daemon or queue
4105 runner is being started, we need to know if Exim was called by an admin user.
4106 This is the case if the real user is root or exim, or if the real group is
4107 exim, or if one of the supplementary groups is exim or a group listed in
4108 admin_groups. We don't fail all message actions immediately if not admin_user,
4109 since some actions can be performed by non-admin users. Instead, set admin_user
4110 for later interrogation. */
4112 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4113 f.admin_user = TRUE;
4115 for (int i = 0; i < group_count && !f.admin_user; i++)
4116 if (group_list[i] == exim_gid)
4117 f.admin_user = TRUE;
4118 else if (admin_groups)
4119 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4120 if (admin_groups[j] == group_list[i])
4121 f.admin_user = TRUE;
4123 /* Another group of privileged users are the trusted users. These are root,
4124 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4125 are permitted to specify sender_addresses with -f on the command line, and
4126 other message parameters as well. */
4128 if (real_uid == root_uid || real_uid == exim_uid)
4129 f.trusted_caller = TRUE;
4133 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4134 if (trusted_users[i] == real_uid)
4135 f.trusted_caller = TRUE;
4138 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4139 if (trusted_groups[i] == real_gid)
4140 f.trusted_caller = TRUE;
4141 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4142 if (trusted_groups[i] == group_list[j])
4143 f.trusted_caller = TRUE;
4146 /* At this point, we know if the user is privileged and some command-line
4147 options become possibly impermissible, depending upon the configuration file. */
4149 if (checking && commandline_checks_require_admin && !f.admin_user)
4150 exim_fail("exim: those command-line flags are set to require admin\n");
4152 /* Handle the decoding of logging options. */
4154 decode_bits(log_selector, log_selector_size, log_notall,
4155 log_selector_string, log_options, log_options_count, US"log", 0);
4159 debug_printf("configuration file is %s\n", config_main_filename);
4160 debug_printf("log selectors =");
4161 for (int i = 0; i < log_selector_size; i++)
4162 debug_printf(" %08x", log_selector[i]);
4166 /* If domain literals are not allowed, check the sender address that was
4167 supplied with -f. Ditto for a stripped trailing dot. */
4171 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4172 exim_fail("exim: bad -f address \"%s\": domain literals not "
4173 "allowed\n", sender_address);
4174 if (f_end_dot && !strip_trailing_dot)
4175 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4176 "(trailing dot not allowed)\n", sender_address);
4179 /* See if an admin user overrode our logging. */
4181 if (cmdline_syslog_name)
4184 syslog_processname = cmdline_syslog_name;
4185 log_file_path = string_copy(CUS"syslog");
4188 /* not a panic, non-privileged users should not be able to spam paniclog */
4190 "exim: you lack sufficient privilege to specify syslog process name\n");
4192 /* Paranoia check of maximum lengths of certain strings. There is a check
4193 on the length of the log file path in log.c, which will come into effect
4194 if there are any calls to write the log earlier than this. However, if we
4195 get this far but the string is very long, it is better to stop now than to
4196 carry on and (e.g.) receive a message and then have to collapse. The call to
4197 log_write() from here will cause the ultimate panic collapse if the complete
4198 file name exceeds the buffer length. */
4200 if (Ustrlen(log_file_path) > 200)
4201 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4202 "log_file_path is longer than 200 chars: aborting");
4204 if (Ustrlen(pid_file_path) > 200)
4205 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4206 "pid_file_path is longer than 200 chars: aborting");
4208 if (Ustrlen(spool_directory) > 200)
4209 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4210 "spool_directory is longer than 200 chars: aborting");
4212 /* Length check on the process name given to syslog for its TAG field,
4213 which is only permitted to be 32 characters or less. See RFC 3164. */
4215 if (Ustrlen(syslog_processname) > 32)
4216 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4217 "syslog_processname is longer than 32 chars: aborting");
4222 log_write(0, LOG_MAIN, "%s", log_oneline);
4223 return EXIT_SUCCESS;
4226 return EXIT_FAILURE;
4228 /* In some operating systems, the environment variable TMPDIR controls where
4229 temporary files are created; Exim doesn't use these (apart from when delivering
4230 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4231 If TMPDIR is found in the environment, reset it to the value defined in the
4232 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4233 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4234 EXIM_TMPDIR by the build scripts.
4238 if (environ) for (uschar ** p = USS environ; *p; p++)
4239 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4241 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4242 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4244 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4248 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4249 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4250 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4251 called by a user who has set the TZ variable. This then affects the timestamps
4252 in log files and in Received: headers, and any created Date: header lines. The
4253 required timezone is settable in the configuration file, so nothing can be done
4254 about this earlier - but hopefully nothing will normally be logged earlier than
4255 this. We have to make a new environment if TZ is wrong, but don't bother if
4256 timestamps_utc is set, because then all times are in UTC anyway. */
4258 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4259 f.timestamps_utc = TRUE;
4262 uschar *envtz = US getenv("TZ");
4264 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4265 : timezone_string != NULL
4268 uschar **p = USS environ;
4272 if (environ) while (*p++) count++;
4273 if (!envtz) count++;
4274 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4275 if (environ) for (p = USS environ; *p; p++)
4276 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4277 if (timezone_string)
4279 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4280 sprintf(CS *newp++, "TZ=%s", timezone_string);
4285 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4286 tod_stamp(tod_log));
4290 /* Handle the case when we have removed the setuid privilege because of -C or
4291 -D. This means that the caller of Exim was not root.
4293 There is a problem if we were running as the Exim user. The sysadmin may
4294 expect this case to retain privilege because "the binary was called by the
4295 Exim user", but it hasn't, because either the -D option set macros, or the
4296 -C option set a non-trusted configuration file. There are two possibilities:
4298 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4299 to do message deliveries. Thus, the fact that it is running as a
4300 non-privileged user is plausible, and might be wanted in some special
4301 configurations. However, really_exim will have been set false when
4302 privilege was dropped, to stop Exim trying to write to its normal log
4303 files. Therefore, re-enable normal log processing, assuming the sysadmin
4304 has set up the log directory correctly.
4306 (2) If deliver_drop_privilege is not set, the configuration won't work as
4307 apparently intended, and so we log a panic message. In order to retain
4308 root for -C or -D, the caller must either be root or be invoking a
4309 trusted configuration file (when deliver_drop_privilege is false). */
4311 if ( removed_privilege
4312 && (!f.trusted_config || opt_D_used)
4313 && real_uid == exim_uid)
4314 if (deliver_drop_privilege)
4315 f.really_exim = TRUE; /* let logging work normally */
4317 log_write(0, LOG_MAIN|LOG_PANIC,
4318 "exim user lost privilege for using %s option",
4319 f.trusted_config? "-D" : "-C");
4321 /* Start up Perl interpreter if Perl support is configured and there is a
4322 perl_startup option, and the configuration or the command line specifies
4323 initializing starting. Note that the global variables are actually called
4324 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4327 if (perl_start_option != 0)
4328 opt_perl_at_start = (perl_start_option > 0);
4329 if (opt_perl_at_start && opt_perl_startup != NULL)
4332 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4333 if ((errstr = init_perl(opt_perl_startup)))
4334 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4335 opt_perl_started = TRUE;
4337 #endif /* EXIM_PERL */
4339 /* Log the arguments of the call if the configuration file said so. This is
4340 a debugging feature for finding out what arguments certain MUAs actually use.
4341 Don't attempt it if logging is disabled, or if listing variables or if
4342 verifying/testing addresses or expansions. */
4344 if ( (debug_selector & D_any || LOGGING(arguments))
4345 && f.really_exim && !list_options && !checking)
4347 uschar *p = big_buffer;
4348 Ustrcpy(p, US"cwd= (failed)");
4355 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4356 p += Ustrlen(CCS p);
4359 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4361 for (int i = 0; i < argc; i++)
4363 int len = Ustrlen(argv[i]);
4364 const uschar *printing;
4366 if (p + len + 8 >= big_buffer + big_buffer_size)
4368 Ustrcpy(p, US" ...");
4369 log_write(0, LOG_MAIN, "%s", big_buffer);
4370 Ustrcpy(big_buffer, US"...");
4373 printing = string_printing(argv[i]);
4374 if (!*printing) quote = US"\"";
4377 const uschar *pp = printing;
4379 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4381 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4382 (p - big_buffer) - 4), printing, quote);
4385 if (LOGGING(arguments))
4386 log_write(0, LOG_MAIN, "%s", big_buffer);
4388 debug_printf("%s\n", big_buffer);
4391 /* Set the working directory to be the top-level spool directory. We don't rely
4392 on this in the code, which always uses fully qualified names, but it's useful
4393 for core dumps etc. Don't complain if it fails - the spool directory might not
4394 be generally accessible and calls with the -C option (and others) have lost
4395 privilege by now. Before the chdir, we try to ensure that the directory exists.
4398 if (Uchdir(spool_directory) != 0)
4400 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4401 (void) Uchdir(spool_directory);
4404 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4405 alias file. Exim doesn't have such a concept, but this call is screwed into
4406 Sun's YP makefiles. Handle this by calling a configured script, as the real
4407 user who called Exim. The -oA option can be used to pass an argument to the
4412 (void) fclose(config_file);
4413 if (bi_command && *bi_command)
4417 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4418 if (alias_arg) argv[i++] = alias_arg;
4421 setgroups(group_count, group_list);
4422 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4424 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4425 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4427 execv(CS argv[0], (char *const *)argv);
4428 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4432 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4437 /* We moved the admin/trusted check to be immediately after reading the
4438 configuration file. We leave these prints here to ensure that syslog setup,
4439 logfile setup, and so on has already happened. */
4441 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4442 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4444 /* Only an admin user may start the daemon or force a queue run in the default
4445 configuration, but the queue run restriction can be relaxed. Only an admin
4446 user may request that a message be returned to its sender forthwith. Only an
4447 admin user may specify a debug level greater than D_v (because it might show
4448 passwords, etc. in lookup queries). Only an admin user may request a queue
4449 count. Only an admin user can use the test interface to scan for email
4450 (because Exim will be in the spool dir and able to look at mails). */
4454 BOOL debugset = (debug_selector & ~D_v) != 0;
4455 if ( deliver_give_up || f.daemon_listen || malware_test_file
4456 || count_queue && queue_list_requires_admin
4457 || list_queue && queue_list_requires_admin
4458 || qrunners && prod_requires_admin
4459 || queue_name_dest && prod_requires_admin
4460 || debugset && !f.running_in_test_harness
4462 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4465 /* If the real user is not root or the exim uid, the argument for passing
4466 in an open TCP/IP connection for another message is not permitted, nor is
4467 running with the -N option for any delivery action, unless this call to exim is
4468 one that supplied an input message, or we are using a patched exim for
4469 regression testing. */
4471 if ( real_uid != root_uid && real_uid != exim_uid
4472 && ( continue_hostname
4474 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4476 && !f.running_in_test_harness
4478 exim_fail("exim: Permission denied\n");
4480 /* If the caller is not trusted, certain arguments are ignored when running for
4481 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4482 Note that authority for performing certain actions on messages is tested in the
4483 queue_action() function. */
4485 if (!f.trusted_caller && !checking)
4487 sender_host_name = sender_host_address = interface_address =
4488 sender_ident = received_protocol = NULL;
4489 sender_host_port = interface_port = 0;
4490 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4493 /* If a sender host address is set, extract the optional port number off the
4494 end of it and check its syntax. Do the same thing for the interface address.
4495 Exim exits if the syntax is bad. */
4499 if (sender_host_address)
4500 sender_host_port = check_port(sender_host_address);
4501 if (interface_address)
4502 interface_port = check_port(interface_address);
4505 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4508 if (f.trusted_caller)
4510 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4511 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4514 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4517 /* If an SMTP message is being received check to see if the standard input is a
4518 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4519 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4524 union sockaddr_46 inetd_sock;
4525 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4526 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4528 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4529 if (family == AF_INET || family == AF_INET6)
4531 union sockaddr_46 interface_sock;
4532 size = sizeof(interface_sock);
4534 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4535 interface_address = host_ntoa(-1, &interface_sock, NULL,
4538 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4540 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4543 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4544 NULL, &sender_host_port);
4545 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4546 "inetd is not supported when mua_wrapper is set");
4550 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4555 /* If the load average is going to be needed while receiving a message, get it
4556 now for those OS that require the first call to os_getloadavg() to be done as
4557 root. There will be further calls later for each message received. */
4559 #ifdef LOAD_AVG_NEEDS_ROOT
4560 if ( receiving_message
4561 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4562 load_average = OS_GETLOADAVG();
4565 /* The queue_only configuration option can be overridden by -odx on the command
4566 line, except that if queue_only_override is false, queue_only cannot be unset
4567 from the command line. */
4569 if (queue_only_set && (queue_only_override || arg_queue_only))
4570 queue_only = arg_queue_only;
4572 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4575 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4576 if (arg_smtp_receive_timeout >= 0)
4577 smtp_receive_timeout = arg_smtp_receive_timeout;
4579 /* If Exim was started with root privilege, unless we have already removed the
4580 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4581 except when starting the daemon or doing some kind of delivery or address
4582 testing (-bt). These are the only cases when root need to be retained. We run
4583 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4584 retained only for starting the daemon. We always do the initgroups() in this
4585 situation (controlled by the TRUE below), in order to be as close as possible
4586 to the state Exim usually runs in. */
4588 if ( !unprivileged /* originally had root AND */
4589 && !removed_privilege /* still got root AND */
4590 && !f.daemon_listen /* not starting the daemon */
4591 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4592 && ( /* AND EITHER */
4593 deliver_drop_privilege /* requested unprivileged */
4595 !qrunners /* not running the queue */
4596 && ( msg_action_arg < 0 /* and */
4597 || msg_action != MSG_DELIVER /* not delivering */
4599 && (!checking || !f.address_test_mode) /* not address checking */
4600 && !rcpt_verify_quota /* and not quota checking */
4602 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4604 /* When we are retaining a privileged uid, we still change to the exim gid. */
4609 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4610 rv = setgid(exim_gid);
4611 /* Impact of failure is that some stuff might end up with an incorrect group.
4612 We track this for failures from root, since any attempt to change privilege
4613 by root should succeed and failures should be examined. For non-root,
4614 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4615 no need to complain then. */
4617 if (!(unprivileged || removed_privilege))
4618 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4621 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4622 (long int)exim_gid, strerror(errno));
4626 /* Handle a request to scan a file for malware */
4627 if (malware_test_file)
4629 #ifdef WITH_CONTENT_SCAN
4631 set_process_info("scanning file for malware");
4632 if ((result = malware_in_file(malware_test_file)) == FAIL)
4634 printf("No malware found.\n");
4639 printf("Malware lookup returned non-okay/fail: %d\n", result);
4643 printf("Malware found: %s\n", malware_name);
4645 printf("Malware scan detected malware of unknown name.\n");
4647 printf("Malware scanning not enabled at compile time.\n");
4652 /* Handle a request to list the delivery queue */
4656 set_process_info("listing the queue");
4657 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4661 /* Handle a request to count the delivery queue */
4665 set_process_info("counting the queue");
4666 fprintf(stdout, "%u\n", queue_count());
4670 /* Handle actions on specific messages, except for the force delivery and
4671 message load actions, which are done below. Some actions take a whole list of
4672 message ids, which are known to continue up to the end of the arguments. Others
4673 take a single message id and then operate on the recipients list. */
4675 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4677 int yield = EXIT_SUCCESS;
4678 set_process_info("acting on specified messages");
4680 /* ACL definitions may be needed when removing a message (-Mrm) because
4681 event_action gets expanded */
4683 if (msg_action == MSG_REMOVE)
4685 int old_pool = store_pool;
4686 store_pool = POOL_CONFIG;
4688 store_pool = old_pool;
4689 store_writeprotect(POOL_CONFIG);
4692 if (!one_msg_action)
4694 for (i = msg_action_arg; i < argc; i++)
4695 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4696 yield = EXIT_FAILURE;
4699 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4700 default: printf("\n"); break;
4704 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4705 recipients_arg)) yield = EXIT_FAILURE;
4709 /* We used to set up here to skip reading the ACL section, on
4710 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4711 Now, since the intro of the ${acl } expansion, ACL definitions may be
4712 needed in transports so we lost the optimisation. */
4715 int old_pool = store_pool;
4716 #ifdef MEASURE_TIMING
4718 (void)gettimeofday(&t0, NULL);
4721 store_pool = POOL_CONFIG;
4723 store_pool = old_pool;
4725 /* -be can add macro definitions, needing to link to the macro structure
4726 chain. Otherwise, make the memory used for config data readonly. */
4728 if (!expansion_test)
4729 store_writeprotect(POOL_CONFIG);
4731 #ifdef MEASURE_TIMING
4732 report_time_since(&t0, US"readconf_rest (delta)");
4736 /* Handle a request to check quota */
4737 if (rcpt_verify_quota)
4738 if (real_uid != root_uid && real_uid != exim_uid)
4739 exim_fail("exim: Permission denied\n");
4740 else if (recipients_arg >= argc)
4741 exim_fail("exim: missing recipient for quota check\n");
4744 verify_quota(argv[recipients_arg]);
4745 exim_exit(EXIT_SUCCESS);
4748 /* Handle the -brt option. This is for checking out retry configurations.
4749 The next three arguments are a domain name or a complete address, and
4750 optionally two error numbers. All it does is to call the function that
4751 scans the retry configuration data. */
4753 if (test_retry_arg >= 0)
4755 retry_config *yield;
4756 int basic_errno = 0;
4758 const uschar *s1, *s2;
4760 if (test_retry_arg >= argc)
4762 printf("-brt needs a domain or address argument\n");
4763 exim_exit(EXIT_FAILURE);
4765 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4768 /* If the first argument contains no @ and no . it might be a local user
4769 or it might be a single-component name. Treat as a domain. */
4771 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4773 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4774 "being \ntreated as a one-component domain, not as a local part.\n\n",
4778 /* There may be an optional second domain arg. */
4780 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4781 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4783 /* The final arg is an error name */
4785 if (test_retry_arg < argc)
4787 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4789 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4792 printf("%s\n", CS error);
4793 return EXIT_FAILURE;
4796 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4797 code > 100 as an error is for matching codes to the decade. Turn them into
4798 a real error code, off the decade. */
4800 if (basic_errno == ERRNO_MAIL4XX ||
4801 basic_errno == ERRNO_RCPT4XX ||
4802 basic_errno == ERRNO_DATA4XX)
4804 int code = (more_errno >> 8) & 255;
4806 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4807 else if (code > 100)
4808 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4812 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4813 printf("No retry information found\n");
4816 more_errno = yield->more_errno;
4817 printf("Retry rule: %s ", yield->pattern);
4819 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4821 printf("quota%s%s ",
4822 (more_errno > 0)? "_" : "",
4823 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4825 else if (yield->basic_errno == ECONNREFUSED)
4827 printf("refused%s%s ",
4828 (more_errno > 0)? "_" : "",
4829 (more_errno == 'M')? "MX" :
4830 (more_errno == 'A')? "A" : "");
4832 else if (yield->basic_errno == ETIMEDOUT)
4835 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4837 if (more_errno != 0) printf("_%s",
4838 (more_errno == 'M')? "MX" : "A");
4841 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4842 printf("auth_failed ");
4845 for (retry_rule * r = yield->rules; r; r = r->next)
4847 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4848 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4854 printf(",%d.", x/1000);
4868 exim_exit(EXIT_SUCCESS);
4871 /* Handle a request to list one or more configuration options */
4872 /* If -n was set, we suppress some information */
4877 set_process_info("listing variables");
4878 if (recipients_arg >= argc)
4879 fail = !readconf_print(US"all", NULL, flag_n);
4880 else for (i = recipients_arg; i < argc; i++)
4883 (Ustrcmp(argv[i], "router") == 0 ||
4884 Ustrcmp(argv[i], "transport") == 0 ||
4885 Ustrcmp(argv[i], "authenticator") == 0 ||
4886 Ustrcmp(argv[i], "macro") == 0 ||
4887 Ustrcmp(argv[i], "environment") == 0))
4889 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4893 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4895 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4900 set_process_info("listing config");
4901 exim_exit(readconf_print(US"config", NULL, flag_n)
4902 ? EXIT_SUCCESS : EXIT_FAILURE);
4906 /* Initialise subsystems as required. */
4910 /* Handle a request to deliver one or more messages that are already on the
4911 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4912 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4914 Delivery of specific messages is typically used for a small number when
4915 prodding by hand (when the option forced_delivery will be set) or when
4916 re-execing to regain root privilege. Each message delivery must happen in a
4917 separate process, so we fork a process for each one, and run them sequentially
4918 so that debugging output doesn't get intertwined, and to avoid spawning too
4919 many processes if a long list is given. However, don't fork for the last one;
4920 this saves a process in the common case when Exim is called to deliver just one
4923 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4925 if (prod_requires_admin && !f.admin_user)
4927 fprintf(stderr, "exim: Permission denied\n");
4928 exim_exit(EXIT_FAILURE);
4930 set_process_info("delivering specified messages");
4931 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4932 for (i = msg_action_arg; i < argc; i++)
4936 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4937 that runs into a later copy into the untainted global message_id[] */
4938 /*XXX Do we need a length limit check here? */
4940 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4941 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4943 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4944 exim_underbar_exit(EXIT_SUCCESS);
4948 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4950 exim_exit(EXIT_FAILURE);
4954 exim_exit(EXIT_SUCCESS);
4958 /* If only a single queue run is requested, without SMTP listening, we can just
4959 turn into a queue runner, with an optional starting message id. */
4961 if (is_onetime_qrun() && !f.daemon_listen)
4963 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
4964 exim_exit(EXIT_SUCCESS);
4968 /* Find the login name of the real user running this process. This is always
4969 needed when receiving a message, because it is written into the spool file. It
4970 may also be used to construct a from: or a sender: header, and in this case we
4971 need the user's full name as well, so save a copy of it, checked for RFC822
4972 syntax and munged if necessary, if it hasn't previously been set by the -F
4973 argument. We may try to get the passwd entry more than once, in case NIS or
4974 other delays are in evidence. Save the home directory for use in filter testing
4979 if ((pw = getpwuid(real_uid)) != NULL)
4981 originator_login = string_copy(US pw->pw_name);
4982 originator_home = string_copy(US pw->pw_dir);
4984 /* If user name has not been set by -F, set it from the passwd entry
4985 unless -f has been used to set the sender address by a trusted user. */
4987 if (!originator_name)
4989 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4991 uschar *name = US pw->pw_gecos;
4992 uschar *amp = Ustrchr(name, '&');
4995 /* Most Unix specify that a '&' character in the gecos field is
4996 replaced by a copy of the login name, and some even specify that
4997 the first character should be upper cased, so that's what we do. */
5002 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5003 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5004 buffer[loffset] = toupper(buffer[loffset]);
5008 /* If a pattern for matching the gecos field was supplied, apply
5009 it and then expand the name string. */
5011 if (gecos_pattern && gecos_name)
5013 const pcre2_code *re;
5014 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5016 if (regex_match_and_setup(re, name, 0, -1))
5018 uschar *new_name = expand_string(gecos_name);
5022 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5023 "gecos field \"%s\"\n", new_name, name);
5026 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5027 "\"%s\": %s\n", gecos_name, expand_string_message);
5029 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5030 "gecos field \"%s\"\n", gecos_pattern, name);
5031 store_free((void *)re);
5033 originator_name = string_copy(name);
5036 /* A trusted caller has used -f but not -F */
5038 else originator_name = US"";
5041 /* Break the retry loop */
5046 if (++i > finduser_retries) break;
5050 /* If we cannot get a user login, log the incident and give up, unless the
5051 configuration specifies something to use. When running in the test harness,
5052 any setting of unknown_login overrides the actual name. */
5054 if (!originator_login || f.running_in_test_harness)
5058 originator_login = expand_string(unknown_login);
5059 if (!originator_name && unknown_username)
5060 originator_name = expand_string(unknown_username);
5061 if (!originator_name) originator_name = US"";
5063 if (!originator_login)
5064 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5068 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5071 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5073 /* If a message is created by this call of Exim, the uid/gid of its originator
5074 are those of the caller. These values are overridden if an existing message is
5075 read in from the spool. */
5077 originator_uid = real_uid;
5078 originator_gid = real_gid;
5080 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5081 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5083 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5084 returns. We leave this till here so that the originator_ fields are available
5085 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5088 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5092 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5093 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5094 "mua_wrapper is set");
5097 # ifndef DISABLE_TLS
5098 /* This also checks that the library linkage is working and we can call
5099 routines in it, so call even if tls_require_ciphers is unset */
5101 # ifdef MEASURE_TIMING
5103 (void)gettimeofday(&t0, NULL);
5105 if (!tls_dropprivs_validate_require_cipher(FALSE))
5107 # ifdef MEASURE_TIMING
5108 report_time_since(&t0, US"validate_ciphers (delta)");
5116 /* If the sender ident has not been set (by a trusted caller) set it to
5117 the caller. This will get overwritten below for an inetd call. If a trusted
5118 caller has set it empty, unset it. */
5120 if (!sender_ident) sender_ident = originator_login;
5121 else if (!*sender_ident) sender_ident = NULL;
5123 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5124 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5125 originator_* variables set. */
5127 if (test_rewrite_arg >= 0)
5129 f.really_exim = FALSE;
5130 if (test_rewrite_arg >= argc)
5132 printf("-brw needs an address argument\n");
5133 exim_exit(EXIT_FAILURE);
5135 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5136 exim_exit(EXIT_SUCCESS);
5139 /* A locally-supplied message is considered to be coming from a local user
5140 unless a trusted caller supplies a sender address with -f, or is passing in the
5141 message via SMTP (inetd invocation or otherwise). */
5143 if ( !sender_address && !smtp_input
5144 || !f.trusted_caller && filter_test == FTEST_NONE)
5146 f.sender_local = TRUE;
5148 /* A trusted caller can supply authenticated_sender and authenticated_id
5149 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5150 defaults except when host checking. */
5152 if (!authenticated_sender && !host_checking)
5153 authenticated_sender = string_sprintf("%s@%s", originator_login,
5154 qualify_domain_sender);
5155 if (!authenticated_id && !host_checking)
5156 authenticated_id = originator_login;
5159 /* Trusted callers are always permitted to specify the sender address.
5160 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5161 is specified is the empty address. However, if a trusted caller does not
5162 specify a sender address for SMTP input, we leave sender_address unset. This
5163 causes the MAIL commands to be honoured. */
5165 if ( !smtp_input && !sender_address
5166 || !receive_check_set_sender(sender_address))
5168 /* Either the caller is not permitted to set a general sender, or this is
5169 non-SMTP input and the trusted caller has not set a sender. If there is no
5170 sender, or if a sender other than <> is set, override with the originator's
5171 login (which will get qualified below), except when checking things. */
5173 if ( !sender_address /* No sender_address set */
5175 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5176 !checking)) /* Not running tests, including filter tests */
5178 sender_address = originator_login;
5179 f.sender_address_forced = FALSE;
5180 sender_address_domain = 0;
5184 /* Remember whether an untrusted caller set the sender address */
5186 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5188 /* Ensure that the sender address is fully qualified unless it is the empty
5189 address, which indicates an error message, or doesn't exist (root caller, smtp
5190 interface, no -f argument). */
5192 if (sender_address && *sender_address && sender_address_domain == 0)
5193 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5194 qualify_domain_sender);
5196 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5198 /* Handle a request to verify a list of addresses, or test them for delivery.
5199 This must follow the setting of the sender address, since routers can be
5200 predicated upon the sender. If no arguments are given, read addresses from
5201 stdin. Set debug_level to at least D_v to get full output for address testing.
5204 if (verify_address_mode || f.address_test_mode)
5207 int flags = vopt_qualify;
5209 if (verify_address_mode)
5211 if (!verify_as_sender) flags |= vopt_is_recipient;
5212 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5217 flags |= vopt_is_recipient;
5218 debug_selector |= D_v;
5219 debug_file = stderr;
5220 debug_fd = fileno(debug_file);
5221 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5224 if (recipients_arg < argc)
5225 while (recipients_arg < argc)
5227 /* Supplied addresses are tainted since they come from a user */
5228 uschar * s = string_copy_taint(
5229 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5233 BOOL finished = FALSE;
5234 uschar *ss = parse_find_address_end(s, FALSE);
5235 if (*ss == ',') *ss = 0; else finished = TRUE;
5236 test_address(s, flags, &exit_value);
5239 while (*++s == ',' || isspace(*s)) ;
5245 uschar * s = get_stdinput(NULL, NULL);
5247 test_address(string_copy_taint(
5248 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5250 flags, &exit_value);
5254 exim_exit(exit_value);
5257 /* Handle expansion checking. Either expand items on the command line, or read
5258 from stdin if there aren't any. If -Mset was specified, load the message so
5259 that its variables can be used, but restrict this facility to admin users.
5260 Otherwise, if -bem was used, read a message from stdin. */
5264 dns_init(FALSE, FALSE, FALSE);
5265 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5269 exim_fail("exim: permission denied\n");
5270 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5271 /* Checking the length of the ID is sufficient to validate it.
5272 Get an untainted version so file opens can be done. */
5273 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5275 spoolname = string_sprintf("%s-H", message_id);
5276 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5277 printf ("Failed to load message datafile %s\n", message_id);
5278 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5279 printf ("Failed to load message %s\n", message_id);
5282 /* Read a test message from a file. We fudge it up to be on stdin, saving
5283 stdin itself for later reading of expansion strings. */
5285 else if (expansion_test_message)
5287 int save_stdin = dup(0);
5288 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5290 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5293 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5294 message_ended = END_NOTENDED;
5295 read_message_body(receive_msg(extract_recipients));
5296 message_linecount += body_linecount;
5297 (void)dup2(save_stdin, 0);
5298 (void)close(save_stdin);
5299 clearerr(stdin); /* Required by Darwin */
5302 /* Only admin users may see config-file macros this way */
5304 if (!f.admin_user) macros_user = macros = mlast = NULL;
5306 /* Allow $recipients for this testing */
5308 f.enable_dollar_recipients = TRUE;
5310 /* Expand command line items */
5312 if (recipients_arg < argc)
5313 while (recipients_arg < argc)
5314 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5320 char *(*fn_readline)(const char *) = NULL;
5321 void (*fn_addhist)(const char *) = NULL;
5325 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5328 while (s = get_stdinput(fn_readline, fn_addhist))
5329 expansion_test_line(s);
5332 if (dlhandle) dlclose(dlhandle);
5336 /* The data file will be open after -Mset */
5338 if (deliver_datafile >= 0)
5340 (void)close(deliver_datafile);
5341 deliver_datafile = -1;
5344 exim_exit(EXIT_SUCCESS);
5348 /* The active host name is normally the primary host name, but it can be varied
5349 for hosts that want to play several parts at once. We need to ensure that it is
5350 set for host checking, and for receiving messages. */
5352 smtp_active_hostname = primary_hostname;
5353 if (raw_active_hostname != NULL)
5355 uschar *nah = expand_string(raw_active_hostname);
5358 if (!f.expand_string_forcedfail)
5359 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5360 "(smtp_active_hostname): %s", raw_active_hostname,
5361 expand_string_message);
5363 else if (nah[0] != 0) smtp_active_hostname = nah;
5366 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5367 given IP address so that the blocking and relay configuration can be tested.
5368 Unless a sender_ident was set by -oMt, we discard it (the default is the
5369 caller's login name). An RFC 1413 call is made only if we are running in the
5370 test harness and an incoming interface and both ports are specified, because
5371 there is no TCP/IP call to find the ident for. */
5378 if (!sender_ident_set)
5380 sender_ident = NULL;
5381 if (f.running_in_test_harness && sender_host_port
5382 && interface_address && interface_port)
5383 verify_get_ident(1223); /* note hardwired port number */
5386 /* In case the given address is a non-canonical IPv6 address, canonicalize
5387 it. The code works for both IPv4 and IPv6, as it happens. */
5389 size = host_aton(sender_host_address, x);
5390 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5391 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5393 /* Now set up for testing */
5395 host_build_sender_fullhost();
5399 f.sender_local = FALSE;
5400 f.sender_host_notsocket = TRUE;
5401 debug_file = stderr;
5402 debug_fd = fileno(debug_file);
5403 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5404 "**** but without any ident (RFC 1413) callback.\n"
5405 "**** This is not for real!\n\n",
5406 sender_host_address);
5408 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5409 if (verify_check_host(&hosts_connection_nolog) == OK)
5411 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5412 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5414 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5416 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5417 because a log line has already been written for all its failure exists
5418 (usually "connection refused: <reason>") and writing another one is
5419 unnecessary clutter. */
5421 if (smtp_start_session())
5424 for (; (reset_point = store_mark()); store_reset(reset_point))
5426 if (smtp_setup_msg() <= 0) break;
5427 if (!receive_msg(FALSE)) break;
5429 return_path = sender_address = NULL;
5430 dnslist_domain = dnslist_matched = NULL;
5431 #ifndef DISABLE_DKIM
5432 dkim_cur_signer = NULL;
5435 deliver_localpart_orig = NULL;
5436 deliver_domain_orig = NULL;
5437 callout_address = sending_ip_address = NULL;
5438 deliver_localpart_data = deliver_domain_data =
5439 recipient_data = sender_data = NULL;
5440 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5444 exim_exit(EXIT_SUCCESS);
5448 /* Arrange for message reception if recipients or SMTP were specified;
5449 otherwise complain unless a version print (-bV) happened or this is a filter
5450 verification test or info dump.
5451 In the former case, show the configuration file name. */
5453 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5455 if (version_printed)
5457 if (Ustrchr(config_main_filelist, ':'))
5458 printf("Configuration file search path is %s\n", config_main_filelist);
5459 printf("Configuration file is %s\n", config_main_filename);
5460 return EXIT_SUCCESS;
5463 if (info_flag != CMDINFO_NONE)
5465 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5466 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5469 if (filter_test == FTEST_NONE)
5470 exim_usage(called_as);
5474 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5475 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5476 that we are not called from inetd, because that is rejected above. The
5477 following configuration settings are forced here:
5479 (1) Synchronous delivery (-odi)
5480 (2) Errors to stderr (-oep == -oeq)
5481 (3) No parallel remote delivery
5482 (4) Unprivileged delivery
5484 We don't force overall queueing options because there are several of them;
5485 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5486 to override any SMTP queueing. */
5490 f.synchronous_delivery = TRUE;
5491 arg_error_handling = ERRORS_STDERR;
5492 remote_max_parallel = 1;
5493 deliver_drop_privilege = TRUE;
5494 f.queue_smtp = FALSE;
5495 queue_smtp_domains = NULL;
5497 message_utf8_downconvert = -1; /* convert-if-needed */
5502 /* Prepare to accept one or more new messages on the standard input. When a
5503 message has been read, its id is returned in message_id[]. If doing immediate
5504 delivery, we fork a delivery process for each received message, except for the
5505 last one, where we can save a process switch.
5507 It is only in non-smtp mode that error_handling is allowed to be changed from
5508 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5509 sendmail error modes other than -oem ever actually used? Later: yes.) */
5511 if (!smtp_input) error_handling = arg_error_handling;
5513 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5514 logging being sent down the socket and make an identd call to get the
5517 else if (f.is_inetd)
5519 (void)fclose(stderr);
5520 exim_nullstd(); /* Re-open to /dev/null */
5521 verify_get_ident(IDENT_PORT);
5522 host_build_sender_fullhost();
5523 set_process_info("handling incoming connection from %s via inetd",
5527 /* If the sender host address has been set, build sender_fullhost if it hasn't
5528 already been done (which it will have been for inetd). This caters for the
5529 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5530 so that the test for IP options is skipped for -bs input. */
5532 if (sender_host_address && !sender_fullhost)
5534 host_build_sender_fullhost();
5535 set_process_info("handling incoming connection from %s via -oMa",
5537 f.sender_host_notsocket = TRUE;
5540 /* Otherwise, set the sender host as unknown except for inetd calls. This
5541 prevents host checking in the case of -bs not from inetd and also for -bS. */
5543 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5545 /* If stdout does not exist, then dup stdin to stdout. This can happen
5546 if exim is started from inetd. In this case fd 0 will be set to the socket,
5547 but fd 1 will not be set. This also happens for passed SMTP channels. */
5549 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5551 /* Set up the incoming protocol name and the state of the program. Root is
5552 allowed to force received protocol via the -oMr option above. If we have come
5553 via inetd, the process info has already been set up. We don't set
5554 received_protocol here for smtp input, as it varies according to
5555 batch/HELO/EHLO/AUTH/TLS. */
5559 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5560 smtp_batched_input? "batched " : "",
5561 sender_address ? sender_address : originator_login);
5565 int old_pool = store_pool;
5566 store_pool = POOL_PERM;
5567 if (!received_protocol)
5568 received_protocol = string_sprintf("local%s", called_as);
5569 store_pool = old_pool;
5570 set_process_info("accepting a local non-SMTP message from <%s>",
5574 /* Initialize the session_local_queue-only flag (this will be ignored if
5575 mua_wrapper is set) */
5578 session_local_queue_only = queue_only;
5580 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5581 the spool if so configured. On failure, we must not attempt to send an error
5582 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5583 error code is given.) */
5585 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5586 exim_fail("exim: insufficient disk space\n");
5588 /* If this is smtp input of any kind, real or batched, handle the start of the
5591 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5592 because a log line has already been written for all its failure exists
5593 (usually "connection refused: <reason>") and writing another one is
5594 unnecessary clutter. */
5600 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5601 if (verify_check_host(&hosts_connection_nolog) == OK)
5603 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5604 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5606 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5607 if (!smtp_start_session())
5610 exim_exit(EXIT_SUCCESS);
5614 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5615 (we handle buferring so as to have visibility of fill level). */
5619 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5620 if (expand_string_message)
5621 if (thismessage_size_limit == -1)
5622 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5623 "message_size_limit: %s", expand_string_message);
5625 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5626 "message_size_limit: %s", expand_string_message);
5628 setvbuf(stdin, NULL, _IONBF, 0);
5631 /* Loop for several messages when reading SMTP input. If we fork any child
5632 processes, we don't want to wait for them unless synchronous delivery is
5633 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5634 same as SIG_DFL, despite the fact that documentation often lists the default as
5635 "ignore". This is a confusing area. This is what I know:
5637 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5638 processes that complete simply to go away without ever becoming defunct. You
5639 can't then wait for them - but we don't want to wait for them in the
5640 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5641 happen for all OS (e.g. *BSD is different).
5643 But that's not the end of the story. Some (many? all?) systems have the
5644 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5645 has by default, so it seems that the difference is merely one of default
5646 (compare restarting vs non-restarting signals).
5648 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5649 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5650 of the loop below. Paranoia rules.
5652 February 2003: That's *still* not the end of the story. There are now versions
5653 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5654 process then calls waitpid(), a grumble is written to the system log, because
5655 this is logically inconsistent. In other words, it doesn't like the paranoia.
5656 As a consequence of this, the waitpid() below is now excluded if we are sure
5657 that SIG_IGN works. */
5659 if (!f.synchronous_delivery)
5662 struct sigaction act;
5663 act.sa_handler = SIG_IGN;
5664 sigemptyset(&(act.sa_mask));
5665 act.sa_flags = SA_NOCLDWAIT;
5666 sigaction(SIGCHLD, &act, NULL);
5668 signal(SIGCHLD, SIG_IGN);
5672 /* Save the current store pool point, for resetting at the start of
5673 each message, and save the real sender address, if any. */
5675 real_sender_address = sender_address;
5677 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5678 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5681 for (BOOL more = TRUE; more; )
5683 rmark reset_point = store_mark();
5686 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5687 input and build the recipients list, before calling receive_msg() to read the
5688 message proper. Whatever sender address is given in the SMTP transaction is
5689 often ignored for local senders - we use the actual sender, which is normally
5690 either the underlying user running this process or a -f argument provided by
5691 a trusted caller. It is saved in real_sender_address. The test for whether to
5692 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5697 if ((rc = smtp_setup_msg()) > 0)
5699 if (real_sender_address != NULL &&
5700 !receive_check_set_sender(sender_address))
5702 sender_address = raw_sender = real_sender_address;
5703 sender_address_unrewritten = NULL;
5706 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5707 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5708 the very end. The result of the ACL is ignored (as for other non-SMTP
5709 messages). It is run for its potential side effects. */
5711 if (smtp_batched_input && acl_not_smtp_start != NULL)
5713 uschar *user_msg, *log_msg;
5714 f.enable_dollar_recipients = TRUE;
5715 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5716 &user_msg, &log_msg);
5717 f.enable_dollar_recipients = FALSE;
5720 /* Now get the data for the message */
5722 more = receive_msg(extract_recipients);
5725 cancel_cutthrough_connection(TRUE, US"receive dropped");
5726 if (more) goto MORELOOP;
5727 smtp_log_no_mail(); /* Log no mail if configured */
5728 exim_exit(EXIT_FAILURE);
5733 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5734 smtp_log_no_mail(); /* Log no mail if configured */
5735 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5739 /* In the non-SMTP case, we have all the information from the command
5740 line, but must process it in case it is in the more general RFC822
5741 format, and in any case, to detect syntax errors. Also, it appears that
5742 the use of comma-separated lists as single arguments is common, so we
5743 had better support them. */
5748 int count = argc - recipients_arg;
5749 uschar **list = argv + recipients_arg;
5751 /* These options cannot be changed dynamically for non-SMTP messages */
5753 f.active_local_sender_retain = local_sender_retain;
5754 f.active_local_from_check = local_from_check;
5756 /* Save before any rewriting */
5758 raw_sender = string_copy(sender_address);
5760 /* Loop for each argument (supplied by user hence tainted) */
5762 for (int i = 0; i < count; i++)
5764 int start, end, domain;
5766 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5767 * We'll still want to cap it to something, just in case. */
5768 uschar * s = string_copy_taint(
5769 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5772 /* Loop for each comma-separated address */
5776 BOOL finished = FALSE;
5778 uschar *ss = parse_find_address_end(s, FALSE);
5780 if (*ss == ',') *ss = 0; else finished = TRUE;
5782 /* Check max recipients - if -t was used, these aren't recipients */
5784 if (recipients_max > 0 && ++rcount > recipients_max &&
5785 !extract_recipients)
5786 if (error_handling == ERRORS_STDERR)
5788 fprintf(stderr, "exim: too many recipients\n");
5789 exim_exit(EXIT_FAILURE);
5793 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5794 errors_sender_rc : EXIT_FAILURE;
5798 BOOL b = allow_utf8_domains;
5799 allow_utf8_domains = TRUE;
5802 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5806 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5807 else allow_utf8_domains = b;
5812 if (domain == 0 && !f.allow_unqualified_recipient)
5815 errmess = US"unqualified recipient address not allowed";
5819 if (error_handling == ERRORS_STDERR)
5821 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5822 string_printing(list[i]), errmess);
5823 exim_exit(EXIT_FAILURE);
5829 eblock.text1 = string_printing(list[i]);
5830 eblock.text2 = errmess;
5832 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5833 errors_sender_rc : EXIT_FAILURE;
5836 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5839 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5843 /* Show the recipients when debugging */
5847 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5848 if (recipients_list)
5850 debug_printf("Recipients:\n");
5851 for (int i = 0; i < recipients_count; i++)
5852 debug_printf(" %s\n", recipients_list[i].address);
5856 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5857 ignored; rejecting here would just add complication, and it can just as
5858 well be done later. Allow $recipients to be visible in the ACL. */
5860 if (acl_not_smtp_start)
5862 uschar *user_msg, *log_msg;
5863 f.enable_dollar_recipients = TRUE;
5864 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5865 &user_msg, &log_msg);
5866 f.enable_dollar_recipients = FALSE;
5869 /* Pause for a while waiting for input. If none received in that time,
5870 close the logfile, if we had one open; then if we wait for a long-running
5871 datasource (months, in one use-case) log rotation will not leave us holding
5874 if (!receive_timeout)
5875 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5878 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5879 will just read the headers for the message, and not write anything onto the
5882 message_ended = END_NOTENDED;
5883 more = receive_msg(extract_recipients);
5885 /* more is always FALSE here (not SMTP message) when reading a message
5886 for real; when reading the headers of a message for filter testing,
5887 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5889 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5890 } /* Non-SMTP message reception */
5892 /* If this is a filter testing run, there are headers in store, but
5893 no message on the spool. Run the filtering code in testing mode, setting
5894 the domain to the qualify domain and the local part to the current user,
5895 unless they have been set by options. The prefix and suffix are left unset
5896 unless specified. The the return path is set to to the sender unless it has
5897 already been set from a return-path header in the message. */
5899 if (filter_test != FTEST_NONE)
5901 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5902 deliver_domain_orig = deliver_domain;
5903 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5904 deliver_localpart_orig = deliver_localpart;
5905 deliver_localpart_prefix = US ftest_prefix;
5906 deliver_localpart_suffix = US ftest_suffix;
5907 deliver_home = originator_home;
5911 printf("Return-path copied from sender\n");
5912 return_path = string_copy(sender_address);
5915 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5916 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5918 receive_add_recipient(
5919 string_sprintf("%s%s%s@%s",
5920 ftest_prefix ? ftest_prefix : US"",
5922 ftest_suffix ? ftest_suffix : US"",
5923 deliver_domain), -1);
5925 printf("Recipient = %s\n", recipients_list[0].address);
5926 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5927 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5929 if (chdir("/")) /* Get away from wherever the user is running this from */
5931 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5932 exim_exit(EXIT_FAILURE);
5935 /* Now we run either a system filter test, or a user filter test, or both.
5936 In the latter case, headers added by the system filter will persist and be
5937 available to the user filter. We need to copy the filter variables
5940 if (filter_test & FTEST_SYSTEM)
5941 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5942 exim_exit(EXIT_FAILURE);
5944 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5946 if (filter_test & FTEST_USER)
5947 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5948 exim_exit(EXIT_FAILURE);
5950 exim_exit(EXIT_SUCCESS);
5953 /* Else act on the result of message reception. We should not get here unless
5954 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5955 will be TRUE. If it is not, check on the number of messages received in this
5958 if ( !session_local_queue_only
5959 && smtp_accept_queue_per_connection > 0
5960 && receive_messagecount > smtp_accept_queue_per_connection)
5962 session_local_queue_only = TRUE;
5963 queue_only_reason = 2;
5966 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5967 and queue_only_load is set, check that the load average is below it. If it is
5968 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5969 default), we put the whole session into queue_only mode. It then remains this
5970 way for any subsequent messages on the same SMTP connection. This is a
5971 deliberate choice; even though the load average may fall, it doesn't seem
5972 right to deliver later messages on the same call when not delivering earlier
5973 ones. However, there are odd cases where this is not wanted, so this can be
5974 changed by setting queue_only_load_latch false. */
5976 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5977 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5979 queue_only_reason = 3;
5980 if (queue_only_load_latch) session_local_queue_only = TRUE;
5983 /* If running as an MUA wrapper, all queueing options and freezing options
5987 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5989 /* Log the queueing here, when it will get a message id attached, but
5990 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5993 if (local_queue_only)
5995 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5996 switch(queue_only_reason)
5999 log_write(L_delay_delivery,
6000 LOG_MAIN, "no immediate delivery: more than %d messages "
6001 "received in one connection", smtp_accept_queue_per_connection);
6005 log_write(L_delay_delivery,
6006 LOG_MAIN, "no immediate delivery: load average %.2f",
6007 (double)load_average/1000.0);
6012 else if (f.queue_only_policy || f.deliver_freeze)
6013 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6015 /* Else do the delivery unless the ACL or local_scan() called for queue only
6016 or froze the message. Always deliver in a separate process. A fork failure is
6017 not a disaster, as the delivery will eventually happen on a subsequent queue
6018 run. The search cache must be tidied before the fork, as the parent will
6019 do it before exiting. The child will trigger a lookup failure and
6020 thereby defer the delivery if it tries to use (for example) a cached ldap
6021 connection that the parent has called unbind on. */
6028 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6031 close_unwanted(); /* Close unwanted file descriptors and TLS */
6032 exim_nullstd(); /* Ensure std{in,out,err} exist */
6034 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6035 mode, deliver_drop_privilege is forced TRUE). */
6037 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6039 delivery_re_exec(CEE_EXEC_EXIT);
6040 /* Control does not return here. */
6043 /* No need to re-exec */
6045 rc = deliver_message(message_id, FALSE, FALSE);
6047 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6048 ? EXIT_SUCCESS : EXIT_FAILURE);
6053 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6054 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6055 "process: %s", strerror(errno));
6059 release_cutthrough_connection(US"msg passed for delivery");
6061 /* In the parent, wait if synchronous delivery is required. This will
6062 always be the case in MUA wrapper mode. */
6064 if (f.synchronous_delivery)
6067 while (wait(&status) != pid);
6068 if ((status & 0x00ff) != 0)
6069 log_write(0, LOG_MAIN|LOG_PANIC,
6070 "process %d crashed with signal %d while delivering %s",
6071 (int)pid, status & 0x00ff, message_id);
6072 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6077 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6078 automatically reaps children (see comments above the loop), clear away any
6079 finished subprocesses here, in case there are lots of messages coming in
6080 from the same source. */
6082 #ifndef SIG_IGN_WORKS
6083 while (waitpid(-1, NULL, WNOHANG) > 0);
6087 return_path = sender_address = NULL;
6088 authenticated_sender = NULL;
6089 deliver_localpart_orig = NULL;
6090 deliver_domain_orig = NULL;
6091 deliver_host = deliver_host_address = NULL;
6092 dnslist_domain = dnslist_matched = NULL;
6093 #ifdef WITH_CONTENT_SCAN
6094 malware_name = NULL;
6097 callout_address = NULL;
6098 sending_ip_address = NULL;
6099 deliver_localpart_data = deliver_domain_data =
6100 recipient_data = sender_data = NULL;
6103 store_reset(reset_point);
6106 exim_exit(EXIT_SUCCESS); /* Never returns */
6107 return 0; /* To stop compiler warning */