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;
1718 /*************************************************
1719 * Entry point and high-level code *
1720 *************************************************/
1722 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1723 the appropriate action. All the necessary functions are present in the one
1724 binary. I originally thought one should split it up, but it turns out that so
1725 much of the apparatus is needed in each chunk that one might as well just have
1726 it all available all the time, which then makes the coding easier as well.
1729 argc count of entries in argv
1730 argv argument strings, with argv[0] being the program name
1732 Returns: EXIT_SUCCESS if terminated successfully
1733 EXIT_FAILURE otherwise, except when a message has been sent
1734 to the sender, and -oee was given
1738 main(int argc, char **cargv)
1740 uschar **argv = USS cargv;
1741 int arg_receive_timeout = -1;
1742 int arg_smtp_receive_timeout = -1;
1743 int arg_error_handling = error_handling;
1744 int filter_sfd = -1;
1745 int filter_ufd = -1;
1748 int list_queue_option = 0;
1750 int msg_action_arg = -1;
1751 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1752 int queue_only_reason = 0;
1754 int perl_start_option = 0;
1756 int recipients_arg = argc;
1757 int sender_address_domain = 0;
1758 int test_retry_arg = -1;
1759 int test_rewrite_arg = -1;
1760 gid_t original_egid;
1761 BOOL arg_queue_only = FALSE;
1762 BOOL bi_option = FALSE;
1763 BOOL checking = FALSE;
1764 BOOL count_queue = FALSE;
1765 BOOL expansion_test = FALSE;
1766 BOOL extract_recipients = FALSE;
1767 BOOL flag_G = FALSE;
1768 BOOL flag_n = FALSE;
1769 BOOL forced_delivery = FALSE;
1770 BOOL f_end_dot = FALSE;
1771 BOOL deliver_give_up = FALSE;
1772 BOOL list_queue = FALSE;
1773 BOOL list_options = FALSE;
1774 BOOL list_config = FALSE;
1775 BOOL local_queue_only;
1776 BOOL one_msg_action = FALSE;
1777 BOOL opt_D_used = FALSE;
1778 BOOL queue_only_set = FALSE;
1779 BOOL receiving_message = TRUE;
1780 BOOL sender_ident_set = FALSE;
1781 BOOL session_local_queue_only;
1783 BOOL removed_privilege = FALSE;
1784 BOOL usage_wanted = FALSE;
1785 BOOL verify_address_mode = FALSE;
1786 BOOL verify_as_sender = FALSE;
1787 BOOL rcpt_verify_quota = FALSE;
1788 BOOL version_printed = FALSE;
1789 uschar *alias_arg = NULL;
1790 uschar *called_as = US"";
1791 uschar *cmdline_syslog_name = NULL;
1792 uschar *start_queue_run_id = NULL;
1793 uschar *stop_queue_run_id = NULL;
1794 uschar *expansion_test_message = NULL;
1795 const uschar *ftest_domain = NULL;
1796 const uschar *ftest_localpart = NULL;
1797 const uschar *ftest_prefix = NULL;
1798 const uschar *ftest_suffix = NULL;
1799 uschar *log_oneline = NULL;
1800 uschar *malware_test_file = NULL;
1801 uschar *real_sender_address;
1802 uschar *originator_home = US"/";
1806 struct stat statbuf;
1807 pid_t passed_qr_pid = (pid_t)0;
1808 int passed_qr_pipe = -1;
1809 gid_t group_list[EXIM_GROUPLIST_SIZE];
1811 /* For the -bI: flag */
1812 enum commandline_info info_flag = CMDINFO_NONE;
1813 BOOL info_stdout = FALSE;
1815 /* Possible options for -R and -S */
1817 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1819 /* Need to define this in case we need to change the environment in order
1820 to get rid of a bogus time zone. We have to make it char rather than uschar
1821 because some OS define it in /usr/include/unistd.h. */
1823 extern char **environ;
1825 #ifdef MEASURE_TIMING
1826 (void)gettimeofday(×tamp_startup, NULL);
1829 store_init(); /* Initialise the memory allocation susbsystem */
1830 pcre_init(); /* Set up memory handling for pcre */
1832 /* If the Exim user and/or group and/or the configuration file owner/group were
1833 defined by ref:name at build time, we must now find the actual uid/gid values.
1834 This is a feature to make the lives of binary distributors easier. */
1836 #ifdef EXIM_USERNAME
1837 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1840 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1842 /* If ref:name uses a number as the name, route_finduser() returns
1843 TRUE with exim_uid set and pw coerced to NULL. */
1845 exim_gid = pw->pw_gid;
1846 #ifndef EXIM_GROUPNAME
1849 "exim: ref:name should specify a usercode, not a group.\n"
1850 "exim: can't let you get away with it unless you also specify a group.\n");
1854 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1857 #ifdef EXIM_GROUPNAME
1858 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1859 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1862 #ifdef CONFIGURE_OWNERNAME
1863 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1864 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1865 CONFIGURE_OWNERNAME);
1868 /* We default the system_filter_user to be the Exim run-time user, as a
1869 sane non-root value. */
1870 system_filter_uid = exim_uid;
1872 #ifdef CONFIGURE_GROUPNAME
1873 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1874 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1875 CONFIGURE_GROUPNAME);
1878 /* In the Cygwin environment, some initialization used to need doing.
1879 It was fudged in by means of this macro; now no longer but we'll leave
1880 it in case of others. */
1886 /* Check a field which is patched when we are running Exim within its
1887 testing harness; do a fast initial check, and then the whole thing. */
1889 f.running_in_test_harness =
1890 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1891 if (f.running_in_test_harness)
1894 /* Protect against abusive argv[0] */
1895 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1896 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1898 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1899 at the start of a program; however, it seems that some environments do not
1900 follow this. A "strange" locale can affect the formatting of timestamps, so we
1903 setlocale(LC_ALL, "C");
1905 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1907 #ifdef _POSIX_MONOTONIC_CLOCK
1911 /* Set up the default handler for timing using alarm(). */
1913 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1915 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1916 because store_malloc writes a log entry on failure. */
1918 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1919 exim_fail("exim: failed to get store for log buffer\n");
1921 /* Initialize the default log options. */
1923 bits_set(log_selector, log_selector_size, log_default);
1925 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1926 NULL when the daemon is run and the file is closed. We have to use this
1927 indirection, because some systems don't allow writing to the variable "stderr".
1930 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1932 /* Ensure there is a big buffer for temporary use in several places. It is put
1933 in malloc store so that it can be freed for enlargement if necessary. */
1935 big_buffer = store_malloc(big_buffer_size);
1937 /* Set up the handler for the data request signal, and set the initial
1938 descriptive text. */
1940 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1941 set_process_info("initializing");
1942 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1945 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1946 sigaction(SIGSEGV, &act, NULL);
1949 signal(SIGSEGV, segv_handler); /* log faults */
1952 /* If running in a dockerized environment, the TERM signal is only
1953 delegated to the PID 1 if we request it by setting an signal handler */
1955 if (getpid() == 1) signal(SIGTERM, term_handler);
1957 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1958 in the daemon code. For the rest of Exim's uses, we ignore it. */
1960 signal(SIGHUP, SIG_IGN);
1962 /* We don't want to die on pipe errors as the code is written to handle
1963 the write error instead. */
1965 signal(SIGPIPE, SIG_IGN);
1967 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1968 set to SIG_IGN. This causes subprocesses that complete before the parent
1969 process waits for them not to hang around, so when Exim calls wait(), nothing
1970 is there. The wait() code has been made robust against this, but let's ensure
1971 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1972 ending status. We use sigaction rather than plain signal() on those OS where
1973 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1974 problem on AIX with this.) */
1978 struct sigaction act;
1979 act.sa_handler = SIG_DFL;
1980 sigemptyset(&(act.sa_mask));
1982 sigaction(SIGCHLD, &act, NULL);
1985 signal(SIGCHLD, SIG_DFL);
1988 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1993 /* Set up the version number. Set up the leading 'E' for the external form of
1994 message ids, set the pointer to the internal form, and initialize it to
1995 indicate no message being processed. */
1998 message_id_option[0] = '-';
1999 message_id_external = message_id_option + 1;
2000 message_id_external[0] = 'E';
2001 message_id = message_id_external + 1;
2004 /* Set the umask to zero so that any files Exim creates using open() are
2005 created with the modes that it specifies. NOTE: Files created with fopen() have
2006 a problem, which was not recognized till rather late (February 2006). With this
2007 umask, such files will be world writeable. (They are all content scanning files
2008 in the spool directory, which isn't world-accessible, so this is not a
2009 disaster, but it's untidy.) I don't want to change this overall setting,
2010 however, because it will interact badly with the open() calls. Instead, there's
2011 now a function called modefopen() that fiddles with the umask while calling
2016 /* Precompile the regular expression for matching a message id. Keep this in
2017 step with the code that generates ids in the accept.c module. We need to do
2018 this here, because the -M options check their arguments for syntactic validity
2019 using mac_ismsgid, which uses this. */
2022 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
2024 /* Precompile the regular expression that is used for matching an SMTP error
2025 code, possibly extended, at the start of an error message. Note that the
2026 terminating whitespace character is included. */
2029 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2032 #ifdef WHITELIST_D_MACROS
2033 /* Precompile the regular expression used to filter the content of macros
2034 given to -D for permissibility. */
2036 regex_whitelisted_macro =
2037 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2040 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2041 this seems to be a generally accepted convention, since one finds symbolic
2042 links called "mailq" in standard OS configurations. */
2044 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2045 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2048 receiving_message = FALSE;
2049 called_as = US"-mailq";
2052 /* If the program is called as "rmail" treat it as equivalent to
2053 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2054 i.e. preventing a single dot on a line from terminating the message, and
2055 returning with zero return code, even in cases of error (provided an error
2056 message has been sent). */
2058 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2059 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2062 called_as = US"-rmail";
2063 errors_sender_rc = EXIT_SUCCESS;
2066 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2067 this is a smail convention. */
2069 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2070 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2072 smtp_input = smtp_batched_input = TRUE;
2073 called_as = US"-rsmtp";
2076 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2077 this is a smail convention. */
2079 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2080 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2082 alloc_onetime_qrunner();
2083 receiving_message = FALSE;
2084 called_as = US"-runq";
2087 /* If the program is called as "newaliases" treat it as equivalent to
2088 "exim -bi"; this is a sendmail convention. */
2090 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2091 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2094 receiving_message = FALSE;
2095 called_as = US"-newaliases";
2098 /* Save the original effective uid for a couple of uses later. It should
2099 normally be root, but in some esoteric environments it may not be. */
2101 original_euid = geteuid();
2102 original_egid = getegid();
2104 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2105 to be the same as the real ones. This makes a difference only if Exim is setuid
2106 (or setgid) to something other than root, which could be the case in some
2107 special configurations. */
2109 real_uid = getuid();
2110 real_gid = getgid();
2112 if (real_uid == root_uid)
2114 if ((rv = setgid(real_gid)))
2115 exim_fail("exim: setgid(%ld) failed: %s\n",
2116 (long int)real_gid, strerror(errno));
2117 if ((rv = setuid(real_uid)))
2118 exim_fail("exim: setuid(%ld) failed: %s\n",
2119 (long int)real_uid, strerror(errno));
2122 /* If neither the original real uid nor the original euid was root, Exim is
2123 running in an unprivileged state. */
2125 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2127 /* For most of the args-parsing we need to use permanent pool memory */
2129 int old_pool = store_pool;
2130 store_pool = POOL_PERM;
2132 /* Scan the program's arguments. Some can be dealt with right away; others are
2133 simply recorded for checking and handling afterwards. Do a high-level switch
2134 on the second character (the one after '-'), to save some effort. */
2136 for (i = 1; i < argc; i++)
2138 BOOL badarg = FALSE;
2139 uschar * arg = argv[i];
2143 /* An argument not starting with '-' is the start of a recipients list;
2144 break out of the options-scanning loop. */
2152 /* An option consisting of -- terminates the options */
2154 if (Ustrcmp(arg, "--") == 0)
2156 recipients_arg = i + 1;
2160 /* Handle flagged options */
2162 switchchar = arg[1];
2165 /* Make all -ex options synonymous with -oex arguments, since that
2166 is assumed by various callers. Also make -qR options synonymous with -R
2167 options, as that seems to be required as well. Allow for -qqR too, and
2168 the same for -S options. */
2170 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2171 Ustrncmp(arg+1, "qR", 2) == 0 ||
2172 Ustrncmp(arg+1, "qS", 2) == 0)
2174 switchchar = arg[2];
2177 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2179 switchchar = arg[3];
2181 f.queue_2stage = TRUE;
2184 /* Make -r synonymous with -f, since it is a documented alias */
2186 else if (arg[1] == 'r') switchchar = 'f';
2188 /* Make -ov synonymous with -v */
2190 else if (Ustrcmp(arg, "-ov") == 0)
2196 /* deal with --option_aliases */
2197 else if (switchchar == '-')
2199 if (Ustrcmp(argrest, "help") == 0)
2201 usage_wanted = TRUE;
2204 else if (Ustrcmp(argrest, "version") == 0)
2211 /* High-level switch on active initial letter */
2216 /* sendmail uses -Ac and -Am to control which .cf file is used;
2219 if (!*argrest) { badarg = TRUE; break; }
2222 BOOL ignore = FALSE;
2227 if (*(argrest + 1) == '\0')
2231 if (!ignore) badarg = TRUE;
2235 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2236 so has no need of it. */
2239 if (!*argrest) i++; /* Skip over the type */
2245 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2249 /* -bd: Run in daemon mode, awaiting SMTP connections.
2250 -bdf: Ditto, but in the foreground.
2253 f.daemon_listen = f.daemon_scion = TRUE;
2254 if (*argrest == 'f') f.background_daemon = FALSE;
2255 else if (*argrest) badarg = TRUE;
2258 /* -be: Run in expansion test mode
2259 -bem: Ditto, but read a message from a file first
2262 expansion_test = checking = TRUE;
2263 if (*argrest == 'm')
2265 if (++i >= argc) { badarg = TRUE; break; }
2266 expansion_test_message = argv[i];
2269 if (*argrest) badarg = TRUE;
2272 /* -bF: Run system filter test */
2274 filter_test |= checking = FTEST_SYSTEM;
2275 if (*argrest) badarg = TRUE;
2276 else if (++i < argc) filter_test_sfile = argv[i];
2277 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2280 /* -bf: Run user filter test
2281 -bfd: Set domain for filter testing
2282 -bfl: Set local part for filter testing
2283 -bfp: Set prefix for filter testing
2284 -bfs: Set suffix for filter testing
2289 filter_test |= checking = FTEST_USER;
2290 if (++i < argc) filter_test_ufile = argv[i];
2291 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2296 exim_fail("exim: string expected after %s\n", arg);
2297 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2298 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2299 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2300 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2305 /* -bh: Host checking - an IP address must follow. */
2307 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2309 if (++i >= argc) { badarg = TRUE; break; }
2310 sender_host_address = string_copy_taint(
2311 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2313 host_checking = checking = f.log_testing_mode = TRUE;
2314 f.host_checking_callout = *argrest == 'c';
2315 message_logs = FALSE;
2320 /* -bi: This option is used by sendmail to initialize *the* alias file,
2321 though it has the -oA option to specify a different file. Exim has no
2322 concept of *the* alias file, but since Sun's YP make script calls
2323 sendmail this way, some support must be provided. */
2325 if (!*argrest) bi_option = TRUE;
2329 /* -bI: provide information, of the type to follow after a colon.
2330 This is an Exim flag. */
2332 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2334 uschar *p = argrest+1;
2335 info_flag = CMDINFO_HELP;
2337 if (strcmpic(p, CUS"sieve") == 0)
2339 info_flag = CMDINFO_SIEVE;
2342 else if (strcmpic(p, CUS"dscp") == 0)
2344 info_flag = CMDINFO_DSCP;
2347 else if (strcmpic(p, CUS"help") == 0)
2353 /* -bm: Accept and deliver message - the default option. Reinstate
2354 receiving_message, which got turned off for all -b options.
2355 -bmalware: test the filename given for malware */
2357 if (!*argrest) receiving_message = TRUE;
2358 else if (Ustrcmp(argrest, "alware") == 0)
2360 if (++i >= argc) { badarg = TRUE; break; }
2362 malware_test_file = argv[i];
2367 /* -bnq: For locally originating messages, do not qualify unqualified
2368 addresses. In the envelope, this causes errors; in header lines they
2371 if (Ustrcmp(argrest, "q") == 0)
2373 f.allow_unqualified_sender = FALSE;
2374 f.allow_unqualified_recipient = FALSE;
2379 /* -bpxx: List the contents of the mail queue, in various forms. If
2380 the option is -bpc, just a queue count is needed. Otherwise, if the
2381 first letter after p is r, then order is random. */
2383 if (*argrest == 'c')
2386 if (*++argrest) badarg = TRUE;
2390 if (*argrest == 'r')
2392 list_queue_option = 8;
2395 else list_queue_option = 0;
2399 /* -bp: List the contents of the mail queue, top-level only */
2403 /* -bpu: List the contents of the mail queue, top-level undelivered */
2405 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2407 /* -bpa: List the contents of the mail queue, including all delivered */
2409 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2411 /* Unknown after -bp[r] */
2417 /* -bP: List the configuration variables given as the address list.
2418 Force -v, so configuration errors get displayed. */
2421 /* -bP config: we need to setup here, because later,
2422 when list_options is checked, the config is read already */
2425 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2428 readconf_save_config(version_string);
2432 list_options = TRUE;
2433 debug_selector |= D_v;
2434 debug_file = stderr;
2438 /* -brt: Test retry configuration lookup */
2440 if (Ustrcmp(argrest, "t") == 0)
2443 test_retry_arg = i + 1;
2447 /* -brw: Test rewrite configuration */
2449 else if (Ustrcmp(argrest, "w") == 0)
2452 test_rewrite_arg = i + 1;
2458 /* -bS: Read SMTP commands on standard input, but produce no replies -
2459 all errors are reported by sending messages. */
2462 smtp_input = smtp_batched_input = receiving_message = TRUE;
2466 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2467 on standard output. */
2469 if (!*argrest) smtp_input = receiving_message = TRUE;
2473 /* -bt: address testing mode */
2476 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2480 /* -bv: verify addresses */
2483 verify_address_mode = checking = f.log_testing_mode = TRUE;
2485 /* -bvs: verify sender addresses */
2487 else if (Ustrcmp(argrest, "s") == 0)
2489 verify_address_mode = checking = f.log_testing_mode = TRUE;
2490 verify_as_sender = TRUE;
2495 /* -bV: Print version string and support details */
2499 printf("Exim version %s #%s built %s\n", version_string,
2500 version_cnumber, version_date);
2501 printf("%s\n", CS version_copyright);
2502 version_printed = TRUE;
2503 show_whats_supported(TRUE);
2504 f.log_testing_mode = TRUE;
2509 /* -bw: inetd wait mode, accept a listening socket as stdin */
2511 f.inetd_wait_mode = TRUE;
2512 f.background_daemon = FALSE;
2513 f.daemon_listen = f.daemon_scion = TRUE;
2515 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2516 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2527 /* -C: change configuration file list; ignore if it isn't really
2528 a change! Enforce a prefix check if required. */
2532 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2533 if (Ustrcmp(config_main_filelist, argrest) != 0)
2535 #ifdef ALT_CONFIG_PREFIX
2537 int len = Ustrlen(ALT_CONFIG_PREFIX);
2538 const uschar *list = argrest;
2540 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2541 while((filename = string_nextinlist(&list, &sep, big_buffer,
2543 if ( ( Ustrlen(filename) < len
2544 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2545 || Ustrstr(filename, "/../") != NULL
2547 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2549 exim_fail("-C Permission denied\n");
2551 if (real_uid != root_uid)
2553 #ifdef TRUSTED_CONFIG_LIST
2555 if (real_uid != exim_uid
2556 #ifdef CONFIGURE_OWNER
2557 && real_uid != config_uid
2560 f.trusted_config = FALSE;
2563 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2566 struct stat statbuf;
2568 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2569 (statbuf.st_uid != root_uid /* owner not root */
2570 #ifdef CONFIGURE_OWNER
2571 && statbuf.st_uid != config_uid /* owner not the special one */
2574 (statbuf.st_gid != root_gid /* group not root */
2575 #ifdef CONFIGURE_GROUP
2576 && statbuf.st_gid != config_gid /* group not the special one */
2578 && (statbuf.st_mode & 020) != 0 /* group writeable */
2580 (statbuf.st_mode & 2) != 0) /* world writeable */
2582 f.trusted_config = FALSE;
2587 /* Well, the trust list at least is up to scratch... */
2589 uschar *trusted_configs[32];
2592 int old_pool = store_pool;
2593 store_pool = POOL_MAIN;
2595 reset_point = store_mark();
2596 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2598 uschar *start = big_buffer, *nl;
2599 while (*start && isspace(*start))
2603 nl = Ustrchr(start, '\n');
2606 trusted_configs[nr_configs++] = string_copy(start);
2607 if (nr_configs == nelem(trusted_configs))
2615 const uschar *list = argrest;
2617 while (f.trusted_config && (filename = string_nextinlist(&list,
2618 &sep, big_buffer, big_buffer_size)))
2620 for (i=0; i < nr_configs; i++)
2621 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2623 if (i == nr_configs)
2625 f.trusted_config = FALSE;
2630 else /* No valid prefixes found in trust_list file. */
2631 f.trusted_config = FALSE;
2632 store_reset(reset_point);
2633 store_pool = old_pool;
2636 else /* Could not open trust_list file. */
2637 f.trusted_config = FALSE;
2640 /* Not root; don't trust config */
2641 f.trusted_config = FALSE;
2645 config_main_filelist = argrest;
2646 f.config_changed = TRUE;
2651 /* -D: set up a macro definition */
2654 #ifdef DISABLE_D_OPTION
2655 exim_fail("exim: -D is not available in this Exim binary\n");
2661 uschar *s = argrest;
2664 while (isspace(*s)) s++;
2666 if (*s < 'A' || *s > 'Z')
2667 exim_fail("exim: macro name set by -D must start with "
2668 "an upper case letter\n");
2670 while (isalnum(*s) || *s == '_')
2672 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2676 if (ptr == 0) { badarg = TRUE; break; }
2677 while (isspace(*s)) s++;
2680 if (*s++ != '=') { badarg = TRUE; break; }
2681 while (isspace(*s)) s++;
2684 for (m = macros_user; m; m = m->next)
2685 if (Ustrcmp(m->name, name) == 0)
2686 exim_fail("exim: duplicated -D in command line\n");
2688 m = macro_create(name, s, TRUE);
2690 if (clmacro_count >= MAX_CLMACROS)
2691 exim_fail("exim: too many -D options on command line\n");
2692 clmacros[clmacro_count++] =
2693 string_sprintf("-D%s=%s", m->name, m->replacement);
2700 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2702 if (Ustrcmp(argrest, "ropcr") == 0)
2704 /* drop_cr = TRUE; */
2707 /* -dp: Set up a debug pretrigger buffer with given size. */
2709 else if (Ustrcmp(argrest, "p") == 0)
2713 debug_pretrigger_setup(argv[i]);
2715 /* -dt: Set a debug trigger selector */
2717 else if (Ustrncmp(argrest, "t=", 2) == 0)
2718 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2720 /* -d: Set debug level (see also -v below).
2721 If -dd is used, debugging subprocesses of the daemon is disabled. */
2725 /* Use an intermediate variable so that we don't set debugging while
2726 decoding the debugging bits. */
2728 unsigned int selector = D_default;
2731 if (*argrest == 'd')
2733 f.debug_daemon = TRUE;
2737 decode_bits(&selector, 1, debug_notall, argrest,
2738 debug_options, debug_options_count, US"debug", 0);
2739 debug_selector = selector;
2744 /* -E: This is a local error message. This option is not intended for
2745 external use at all, but is not restricted to trusted callers because it
2746 does no harm (just suppresses certain error messages) and if Exim is run
2747 not setuid root it won't always be trusted when it generates error
2748 messages using this option. If there is a message id following -E, point
2749 message_reference at it, for logging. */
2752 f.local_error_message = TRUE;
2753 if (mac_ismsgid(argrest)) message_reference = argrest;
2757 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2758 option, so it looks as if historically the -oex options are also callable
2759 without the leading -o. So we have to accept them. Before the switch,
2760 anything starting -oe has been converted to -e. Exim does not support all
2761 of the sendmail error options. */
2764 if (Ustrcmp(argrest, "e") == 0)
2766 arg_error_handling = ERRORS_SENDER;
2767 errors_sender_rc = EXIT_SUCCESS;
2769 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2770 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2771 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2772 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2777 /* -F: Set sender's full name, used instead of the gecos entry from
2778 the password file. Since users can usually alter their gecos entries,
2779 there's no security involved in using this instead. The data can follow
2780 the -F or be in the next argument. */
2784 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2785 originator_name = string_copy_taint(
2786 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2788 f.sender_name_forced = TRUE;
2792 /* -f: Set sender's address - this value is only actually used if Exim is
2793 run by a trusted user, or if untrusted_set_sender is set and matches the
2794 address, except that the null address can always be set by any user. The
2795 test for this happens later, when the value given here is ignored when not
2796 permitted. For an untrusted user, the actual sender is still put in Sender:
2797 if it doesn't match the From: header (unless no_local_from_check is set).
2798 The data can follow the -f or be in the next argument. The -r switch is an
2799 obsolete form of -f but since there appear to be programs out there that
2800 use anything that sendmail has ever supported, better accept it - the
2801 synonymizing is done before the switch above.
2803 At this stage, we must allow domain literal addresses, because we don't
2804 know what the setting of allow_domain_literals is yet. Ditto for trailing
2805 dots and strip_trailing_dot. */
2809 int dummy_start, dummy_end;
2812 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2813 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2815 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2818 uschar * temp = argrest + Ustrlen(argrest) - 1;
2819 while (temp >= argrest && isspace(*temp)) temp--;
2820 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2821 allow_domain_literals = TRUE;
2822 strip_trailing_dot = TRUE;
2824 allow_utf8_domains = TRUE;
2826 if (!(sender_address = parse_extract_address(argrest, &errmess,
2827 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2828 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2830 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2832 message_smtputf8 = string_is_utf8(sender_address);
2833 allow_utf8_domains = FALSE;
2835 allow_domain_literals = FALSE;
2836 strip_trailing_dot = FALSE;
2838 f.sender_address_forced = TRUE;
2842 /* -G: sendmail invocation to specify that it's a gateway submission and
2843 sendmail may complain about problems instead of fixing them.
2844 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2845 not at this time complain about problems. */
2851 /* -h: Set the hop count for an incoming message. Exim does not currently
2852 support this; it always computes it by counting the Received: headers.
2853 To put it in will require a change to the spool header file format. */
2857 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2858 if (!isdigit(*argrest)) badarg = TRUE;
2862 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2863 not to be documented for sendmail but mailx (at least) uses it) */
2866 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2870 /* -L: set the identifier used for syslog; equivalent to setting
2871 syslog_processname in the config file, but needs to be an admin option. */
2875 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2876 if ((sz = Ustrlen(argrest)) > 32)
2877 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2879 exim_fail("exim: the -L syslog name is too short\n");
2880 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2884 receiving_message = FALSE;
2886 /* -MC: continue delivery of another message via an existing open
2887 file descriptor. This option is used for an internal call by the
2888 smtp transport when there is a pending message waiting to go to an
2889 address to which it has got a connection. Five subsequent arguments are
2890 required: transport name, host name, IP address, sequence number, and
2891 message_id. Transports may decline to create new processes if the sequence
2892 number gets too big. The channel is stdin. This (-MC) must be the last
2893 argument. There's a subsequent check that the real-uid is privileged.
2895 If we are running in the test harness. delay for a bit, to let the process
2896 that set this one up complete. This makes for repeatability of the logging,
2899 if (Ustrcmp(argrest, "C") == 0)
2901 union sockaddr_46 interface_sock;
2902 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2905 exim_fail("exim: too many or too few arguments after -MC\n");
2907 if (msg_action_arg >= 0)
2908 exim_fail("exim: incompatible arguments\n");
2910 continue_transport = string_copy_taint(
2911 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2913 continue_hostname = string_copy_taint(
2914 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2916 continue_host_address = string_copy_taint(
2917 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2919 continue_sequence = Uatoi(argv[++i]);
2920 msg_action = MSG_DELIVER;
2921 msg_action_arg = ++i;
2922 forced_delivery = TRUE;
2923 queue_run_pid = passed_qr_pid;
2924 queue_run_pipe = passed_qr_pipe;
2926 if (!mac_ismsgid(argv[i]))
2927 exim_fail("exim: malformed message id %s after -MC option\n",
2930 /* Set up $sending_ip_address and $sending_port, unless proxied */
2932 if (!continue_proxy_cipher)
2933 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2935 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2938 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2941 testharness_pause_ms(500);
2945 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2949 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2950 precedes -MC (see above). The flag indicates that the host to which
2951 Exim is connected has accepted an AUTH sequence. */
2953 case 'A': f.smtp_authenticated = TRUE; break;
2955 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2956 that exim is connected to supports the esmtp extension DSN */
2958 case 'D': smtp_peer_options |= OPTION_DSN; break;
2960 /* -MCd: for debug, set a process-purpose string */
2962 case 'd': if (++i < argc)
2963 process_purpose = string_copy_taint(
2964 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2969 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2970 from the commandline should be tainted - but we will need an untainted
2971 value for the spoolfile when doing a -odi delivery process. */
2973 case 'G': if (++i < argc) queue_name = string_copy_taint(
2974 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2979 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2981 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2983 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2984 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2985 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2987 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2989 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2994 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2995 it preceded -MC (see above) */
2997 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2999 #ifdef SUPPORT_SOCKS
3000 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3001 case 'p': proxy_session = TRUE;
3004 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3007 proxy_local_port = Uatoi(argv[i]);
3010 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3013 proxy_external_port = Uatoi(argv[i]);
3019 /* -MCQ: pass on the pid of the queue-running process that started
3020 this chain of deliveries and the fd of its synchronizing pipe; this
3021 is useful only when it precedes -MC (see above) */
3023 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3025 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3029 /* -MCq: do a quota check on the given recipient for the given size
3030 of message. Separate from -MC. */
3031 case 'q': rcpt_verify_quota = TRUE;
3032 if (++i < argc) message_size = Uatoi(argv[i]);
3036 /* -MCS: set the smtp_use_size flag; this is useful only when it
3037 precedes -MC (see above) */
3039 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3042 /* -MCs: used with -MCt; SNI was sent */
3043 /* -MCr: ditto, DANE */
3046 case 's': if (++i < argc)
3048 continue_proxy_sni = string_copy_taint(
3049 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3051 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3056 /* -MCt: similar to -MCT below but the connection is still open
3057 via a proxy process which handles the TLS context and coding.
3058 Require three arguments for the proxied local address and port,
3059 and the TLS cipher. */
3061 case 't': if (++i < argc)
3062 sending_ip_address = string_copy_taint(
3063 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3067 sending_port = (int)(Uatol(argv[i]));
3070 continue_proxy_cipher = string_copy_taint(
3071 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3076 /* -MCT: set the tls_offered flag; this is useful only when it
3077 precedes -MC (see above). The flag indicates that the host to which
3078 Exim is connected has offered TLS support. */
3080 case 'T': smtp_peer_options |= OPTION_TLS; break;
3083 default: badarg = TRUE; break;
3088 /* -M[x]: various operations on the following list of message ids:
3089 -M deliver the messages, ignoring next retry times and thawing
3090 -Mc deliver the messages, checking next retry times, no thawing
3091 -Mf freeze the messages
3092 -Mg give up on the messages
3093 -Mt thaw the messages
3094 -Mrm remove the messages
3095 In the above cases, this must be the last option. There are also the
3096 following options which are followed by a single message id, and which
3097 act on that message. Some of them use the "recipient" addresses as well.
3098 -Mar add recipient(s)
3099 -MG move to a different queue
3100 -Mmad mark all recipients delivered
3101 -Mmd mark recipients(s) delivered
3103 -Mset load a message for use with -be
3105 -Mvc show copy (of whole message, in RFC 2822 format)
3112 msg_action = MSG_DELIVER;
3113 forced_delivery = f.deliver_force_thaw = TRUE;
3115 else if (Ustrcmp(argrest, "ar") == 0)
3117 msg_action = MSG_ADD_RECIPIENT;
3118 one_msg_action = TRUE;
3120 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3121 else if (Ustrcmp(argrest, "es") == 0)
3123 msg_action = MSG_EDIT_SENDER;
3124 one_msg_action = TRUE;
3126 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3127 else if (Ustrcmp(argrest, "g") == 0)
3129 msg_action = MSG_DELIVER;
3130 deliver_give_up = TRUE;
3132 else if (Ustrcmp(argrest, "G") == 0)
3134 msg_action = MSG_SETQUEUE;
3135 queue_name_dest = string_copy_taint(
3136 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3139 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3140 else if (Ustrcmp(argrest, "md") == 0)
3142 msg_action = MSG_MARK_DELIVERED;
3143 one_msg_action = TRUE;
3145 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3146 else if (Ustrcmp(argrest, "set") == 0)
3148 msg_action = MSG_LOAD;
3149 one_msg_action = TRUE;
3151 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3152 else if (Ustrcmp(argrest, "vb") == 0)
3154 msg_action = MSG_SHOW_BODY;
3155 one_msg_action = TRUE;
3157 else if (Ustrcmp(argrest, "vc") == 0)
3159 msg_action = MSG_SHOW_COPY;
3160 one_msg_action = TRUE;
3162 else if (Ustrcmp(argrest, "vh") == 0)
3164 msg_action = MSG_SHOW_HEADER;
3165 one_msg_action = TRUE;
3167 else if (Ustrcmp(argrest, "vl") == 0)
3169 msg_action = MSG_SHOW_LOG;
3170 one_msg_action = TRUE;
3172 else { badarg = TRUE; break; }
3174 /* All the -Mxx options require at least one message id. */
3176 msg_action_arg = i + 1;
3177 if (msg_action_arg >= argc)
3178 exim_fail("exim: no message ids given after %s option\n", arg);
3180 /* Some require only message ids to follow */
3182 if (!one_msg_action)
3184 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3185 exim_fail("exim: malformed message id %s after %s option\n",
3187 goto END_ARG; /* Remaining args are ids */
3190 /* Others require only one message id, possibly followed by addresses,
3191 which will be handled as normal arguments. */
3195 if (!mac_ismsgid(argv[msg_action_arg]))
3196 exim_fail("exim: malformed message id %s after %s option\n",
3197 argv[msg_action_arg], arg);
3203 /* Some programs seem to call the -om option without the leading o;
3204 for sendmail it askes for "me too". Exim always does this. */
3207 if (*argrest) badarg = TRUE;
3211 /* -N: don't do delivery - a debugging option that stops transports doing
3212 their thing. It implies debugging at the D_v level. */
3217 f.dont_deliver = TRUE;
3218 debug_selector |= D_v;
3219 debug_file = stderr;
3225 /* -n: This means "don't alias" in sendmail, apparently.
3226 For normal invocations, it has no effect.
3227 It may affect some other options. */
3233 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3234 option to the specified value. This form uses long names. We need to handle
3235 -O option=value and -Ooption=value. */
3240 exim_fail("exim: string expected after -O\n");
3246 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3249 if (!*(alias_arg = argrest))
3250 if (i+1 < argc) alias_arg = argv[++i];
3251 else exim_fail("exim: string expected after -oA\n");
3254 /* -oB: Set a connection message max value for remote deliveries */
3257 uschar * p = argrest;
3259 if (i+1 < argc && isdigit((argv[i+1][0])))
3263 connection_max_messages = 1;
3270 exim_fail("exim: number expected after -oB\n");
3271 connection_max_messages = Uatoi(p);
3276 /* -odb: background delivery */
3279 if (Ustrcmp(argrest, "b") == 0)
3281 f.synchronous_delivery = FALSE;
3282 arg_queue_only = FALSE;
3283 queue_only_set = TRUE;
3286 /* -odd: testsuite-only: add no inter-process delays */
3288 else if (Ustrcmp(argrest, "d") == 0)
3289 f.testsuite_delays = FALSE;
3291 /* -odf: foreground delivery (smail-compatible option); same effect as
3292 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3295 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3297 f.synchronous_delivery = TRUE;
3298 arg_queue_only = FALSE;
3299 queue_only_set = TRUE;
3302 /* -odq: queue only */
3304 else if (Ustrcmp(argrest, "q") == 0)
3306 f.synchronous_delivery = FALSE;
3307 arg_queue_only = TRUE;
3308 queue_only_set = TRUE;
3311 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3312 but no remote delivery */
3314 else if (Ustrcmp(argrest, "qs") == 0)
3316 f.queue_smtp = TRUE;
3317 arg_queue_only = FALSE;
3318 queue_only_set = TRUE;
3323 /* -oex: Sendmail error flags. As these are also accepted without the
3324 leading -o prefix, for compatibility with vacation and other callers,
3325 they are handled with -e above. */
3327 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3328 -oitrue: Another sendmail syntax for the same */
3331 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3336 /* -oM*: Set various characteristics for an incoming message; actually
3337 acted on for trusted callers only. */
3342 exim_fail("exim: data expected after -oM%s\n", argrest);
3344 /* -oMa: Set sender host address */
3346 if (Ustrcmp(argrest, "a") == 0)
3347 sender_host_address = string_copy_taint(
3348 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3351 /* -oMaa: Set authenticator name */
3353 else if (Ustrcmp(argrest, "aa") == 0)
3354 sender_host_authenticated = string_copy_taint(
3355 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3358 /* -oMas: setting authenticated sender */
3360 else if (Ustrcmp(argrest, "as") == 0)
3361 authenticated_sender = string_copy_taint(
3362 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3365 /* -oMai: setting authenticated id */
3367 else if (Ustrcmp(argrest, "ai") == 0)
3368 authenticated_id = string_copy_taint(
3369 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMai"),
3372 /* -oMi: Set incoming interface address */
3374 else if (Ustrcmp(argrest, "i") == 0)
3375 interface_address = string_copy_taint(
3376 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3379 /* -oMm: Message reference */
3381 else if (Ustrcmp(argrest, "m") == 0)
3383 if (!mac_ismsgid(argv[i+1]))
3384 exim_fail("-oMm must be a valid message ID\n");
3385 if (!f.trusted_config)
3386 exim_fail("-oMm must be called by a trusted user/config\n");
3387 message_reference = argv[++i];
3390 /* -oMr: Received protocol */
3392 else if (Ustrcmp(argrest, "r") == 0)
3394 if (received_protocol)
3395 exim_fail("received_protocol is set already\n");
3397 received_protocol = string_copy_taint(
3398 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3401 /* -oMs: Set sender host name */
3403 else if (Ustrcmp(argrest, "s") == 0)
3404 sender_host_name = string_copy_taint(
3405 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3408 /* -oMt: Set sender ident */
3410 else if (Ustrcmp(argrest, "t") == 0)
3412 sender_ident_set = TRUE;
3413 sender_ident = string_copy_taint(
3414 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3418 /* Else a bad argument */
3425 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3426 seem to call this as -m (undocumented), so that is also accepted (see
3428 /* -oo: An ancient flag for old-style addresses which still seems to
3429 crop up in some calls (see in SCO). */
3433 if (*argrest) badarg = TRUE;
3436 /* -oP <name>: set pid file path for daemon
3437 -oPX: delete pid file of daemon */
3440 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3441 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3442 "(uid=%d euid=%d | %d)\n",
3443 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3444 if (!*argrest) override_pid_file_path = argv[++i];
3445 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3450 /* -or <n>: set timeout for non-SMTP acceptance
3451 -os <n>: set timeout for SMTP acceptance */
3456 int * tp = argrest[-1] == 'r'
3457 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3459 *tp = readconf_readtime(argrest, 0, FALSE);
3460 else if (i+1 < argc)
3461 *tp = readconf_readtime(argv[++i], 0, FALSE);
3464 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3468 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3469 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3472 if (*argrest) badarg = TRUE;
3473 else override_local_interfaces = string_copy_taint(
3474 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3478 /* -oY: Override creation of daemon notifier socket */
3481 if (*argrest) badarg = TRUE;
3482 else f.notifier_socket_en = FALSE;
3485 /* Unknown -o argument */
3493 /* -ps: force Perl startup; -pd force delayed Perl startup */
3497 if (*argrest == 's' && argrest[1] == 0)
3499 perl_start_option = 1;
3502 if (*argrest == 'd' && argrest[1] == 0)
3504 perl_start_option = -1;
3509 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3510 which sets the host protocol and host name */
3513 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3517 uschar * hn = Ustrchr(argrest, ':');
3519 if (received_protocol)
3520 exim_fail("received_protocol is set already\n");
3523 received_protocol = string_copy_taint(
3524 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3528 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3529 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3530 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3535 /* -q: set up queue runs */
3539 BOOL two_stage, first_del, force, thaw = FALSE, local;
3541 receiving_message = FALSE;
3543 /* -qq...: Do queue runs in a 2-stage manner */
3545 if ((two_stage = *argrest == 'q'))
3548 /* -qi...: Do only first (initial) deliveries */
3550 if ((first_del = *argrest == 'i'))
3553 /* -qf...: Run the queue, forcing deliveries
3554 -qff..: Ditto, forcing thawing as well */
3556 if ((force = *argrest == 'f'))
3557 if ((thaw = *++argrest == 'f'))
3560 /* -q[f][f]l...: Run the queue only on local deliveries */
3562 if ((local = *argrest == 'l'))
3565 /* -q[f][f][l][G<name>]... Work on the named queue */
3567 if (*argrest == 'G')
3570 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3571 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3572 queue_name = string_copyn(argrest, i);
3574 if (*argrest == '/') argrest++;
3577 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3578 only, optionally named, optionally starting from a given message id. */
3580 if (!(list_queue || count_queue))
3585 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3587 q = alloc_onetime_qrunner();
3588 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3589 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3590 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3591 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3594 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3595 forced, optionally local only, optionally named. */
3599 int intvl = readconf_readtime(*argrest ? argrest : argv[++i], 0, FALSE);
3601 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3603 for (qrunner * qq = qrunners; qq; qq = qq->next)
3604 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3605 || !queue_name && !qq->name)
3606 exim_fail("exim: queue-runner specified more than once\n");
3608 q = alloc_qrunner();
3609 q->interval = intvl;
3612 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3613 q->queue_run_force = force;
3614 q->deliver_force_thaw = thaw;
3615 q->queue_run_first_delivery = first_del;
3616 q->queue_run_local = local;
3617 q->queue_2stage = two_stage;
3624 case 'R': /* Synonymous with -qR... */
3625 case 'S': /* Synonymous with -qS... */
3627 const uschar * tainted_selectstr;
3630 receiving_message = FALSE;
3632 /* -Rf: As -R (below) but force all deliveries,
3633 -Rff: Ditto, but also thaw all frozen messages,
3634 -Rr: String is regex
3635 -Rrf: Regex and force
3636 -Rrff: Regex and force and thaw
3638 -S...: Like -R but works on sender.
3640 in all cases provided there are no further characters in this
3643 alloc_onetime_qrunner();
3644 qrunners->queue_2stage = f.queue_2stage;
3646 for (int i = 0; i < nelem(rsopts); i++)
3647 if (Ustrcmp(argrest, rsopts[i]) == 0)
3649 if (i != 2) qrunners->queue_run_force = TRUE;
3651 if (switchchar == 'R')
3652 f.deliver_selectstring_regex = TRUE;
3654 f.deliver_selectstring_sender_regex = TRUE;
3655 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3656 argrest += Ustrlen(rsopts[i]);
3659 /* -R or -S: Set string to match in addresses for forced queue run to
3660 pick out particular messages. */
3662 /* Avoid attacks from people providing very long strings, and do so before
3665 tainted_selectstr = argrest;
3666 else if (i+1 < argc)
3667 tainted_selectstr = argv[++i];
3669 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3671 s = string_copy_taint(
3672 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3675 if (switchchar == 'R')
3676 deliver_selectstring = s;
3678 deliver_selectstring_sender = s;
3683 /* -r: an obsolete synonym for -f (see above) */
3685 /* -Tqt is an option that is exclusively for use by the testing suite.
3686 It is not recognized in other circumstances. It allows for the setting up
3687 of explicit "queue times" so that various warning/retry things can be
3688 tested. Otherwise variability of clock ticks etc. cause problems. */
3691 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3692 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3697 /* -t: Set flag to extract recipients from body of message. */
3700 if (!*argrest) extract_recipients = TRUE;
3702 /* -ti: Set flag to extract recipients from body of message, and also
3703 specify that dot does not end the message. */
3705 else if (Ustrcmp(argrest, "i") == 0)
3707 extract_recipients = TRUE;
3711 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3714 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3721 /* -U: This means "initial user submission" in sendmail, apparently. The
3722 doc claims that in future sendmail may refuse syntactically invalid
3723 messages instead of fixing them. For the moment, we just ignore it. */
3729 /* -v: verify things - this is a very low-level debugging */
3734 debug_selector |= D_v;
3735 debug_file = stderr;
3741 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3743 The -x flag tells the sendmail command that mail from a local
3744 mail program has National Language Support (NLS) extended characters
3745 in the body of the mail item. The sendmail command can send mail with
3746 extended NLS characters across networks that normally corrupts these
3749 As Exim is 8-bit clean, it just ignores this flag. */
3752 if (*argrest) badarg = TRUE;
3755 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3756 logs to that file. We swallow the parameter and otherwise ignore it. */
3761 exim_fail("exim: string expected after -X\n");
3764 /* -z: a line of text to log */
3769 log_oneline = string_copy_taint(
3770 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3773 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3776 /* All other initial characters are errors */
3781 } /* End of high-level switch statement */
3783 /* Failed to recognize the option, or syntax error */
3786 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3787 "option %s\n", arg);
3791 /* If -R or -S have been specified without -q, assume a single queue run. */
3793 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3794 alloc_onetime_qrunner();
3798 store_pool = old_pool;
3801 /* If usage_wanted is set we call the usage function - which never returns */
3802 if (usage_wanted) exim_usage(called_as);
3804 /* Arguments have been processed. Check for incompatibilities. */
3805 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3806 && ( f.daemon_listen || qrunners || bi_option
3807 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3808 || filter_test != FTEST_NONE
3809 || msg_action_arg > 0 && !one_msg_action
3811 || ( msg_action_arg > 0
3812 && ( f.daemon_listen || is_multiple_qrun() || list_options
3813 || checking && msg_action != MSG_LOAD
3814 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3816 || ( (f.daemon_listen || is_multiple_qrun())
3817 && ( sender_address || list_options || list_queue || checking
3820 || f.daemon_listen && is_onetime_qrun()
3821 || f.inetd_wait_mode && qrunners
3823 && ( checking || smtp_input || extract_recipients
3824 || filter_test != FTEST_NONE || bi_option
3826 || ( verify_address_mode
3827 && ( f.address_test_mode || smtp_input || extract_recipients
3828 || filter_test != FTEST_NONE || bi_option
3830 || ( f.address_test_mode
3831 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3835 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3837 || deliver_selectstring && !qrunners
3838 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3840 exim_fail("exim: incompatible command-line options or arguments\n");
3842 /* If debugging is set up, set the file and the file descriptor to pass on to
3843 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3844 to run in the foreground. */
3846 if (debug_selector != 0)
3848 debug_file = stderr;
3849 debug_fd = fileno(debug_file);
3850 f.background_daemon = FALSE;
3851 testharness_pause_ms(100); /* lets caller finish */
3852 if (debug_selector != D_v) /* -v only doesn't show this */
3854 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3855 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3857 if (!version_printed)
3858 show_whats_supported(FALSE);
3862 /* When started with root privilege, ensure that the limits on the number of
3863 open files and the number of processes (where that is accessible) are
3864 sufficiently large, or are unset, in case Exim has been called from an
3865 environment where the limits are screwed down. Not all OS have the ability to
3866 change some of these limits. */
3870 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3876 #ifdef RLIMIT_NOFILE
3877 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3879 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3881 rlp.rlim_cur = rlp.rlim_max = 0;
3884 /* I originally chose 1000 as a nice big number that was unlikely to
3885 be exceeded. It turns out that some older OS have a fixed upper limit of
3888 if (rlp.rlim_cur < 1000)
3890 rlp.rlim_cur = rlp.rlim_max = 1000;
3891 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3893 rlp.rlim_cur = rlp.rlim_max = 256;
3894 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3895 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3902 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3904 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3906 rlp.rlim_cur = rlp.rlim_max = 0;
3909 # ifdef RLIM_INFINITY
3910 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3912 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3914 if (rlp.rlim_cur < 1000)
3916 rlp.rlim_cur = rlp.rlim_max = 1000;
3918 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3919 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3925 /* Exim is normally entered as root (but some special configurations are
3926 possible that don't do this). However, it always spins off sub-processes that
3927 set their uid and gid as required for local delivery. We don't want to pass on
3928 any extra groups that root may belong to, so we want to get rid of them all at
3931 We need to obey setgroups() at this stage, before possibly giving up root
3932 privilege for a changed configuration file, but later on we might need to
3933 check on the additional groups for the admin user privilege - can't do that
3934 till after reading the config, which might specify the exim gid. Therefore,
3935 save the group list here first. */
3937 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3938 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3940 /* There is a fundamental difference in some BSD systems in the matter of
3941 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3942 known not to be different. On the "different" systems there is a single group
3943 list, and the first entry in it is the current group. On all other versions of
3944 Unix there is a supplementary group list, which is in *addition* to the current
3945 group. Consequently, to get rid of all extraneous groups on a "standard" system
3946 you pass over 0 groups to setgroups(), while on a "different" system you pass
3947 over a single group - the current group, which is always the first group in the
3948 list. Calling setgroups() with zero groups on a "different" system results in
3949 an error return. The following code should cope with both types of system.
3951 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3952 the "setgroups() with zero groups" - and changes the egid.
3953 Thanks to that we had to stash the original_egid above, for use below
3954 in the call to exim_setugid().
3956 However, if this process isn't running as root, setgroups() can't be used
3957 since you have to be root to run it, even if throwing away groups.
3958 Except, sigh, for Hurd - where you can.
3959 Not being root here happens only in some unusual configurations. */
3962 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3963 && setgroups(0, NULL) != 0
3965 && setgroups(1, group_list) != 0)
3966 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3968 /* If the configuration file name has been altered by an argument on the
3969 command line (either a new file name or a macro definition) and the caller is
3970 not root, or if this is a filter testing run, remove any setuid privilege the
3971 program has and run as the underlying user.
3973 The exim user is locked out of this, which severely restricts the use of -C
3976 Otherwise, set the real ids to the effective values (should be root unless run
3977 from inetd, which it can either be root or the exim uid, if one is configured).
3979 There is a private mechanism for bypassing some of this, in order to make it
3980 possible to test lots of configurations automatically, without having either to
3981 recompile each time, or to patch in an actual configuration file name and other
3982 values (such as the path name). If running in the test harness, pretend that
3983 configuration file changes and macro definitions haven't happened. */
3986 (!f.trusted_config || /* Config changed, or */
3987 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3988 real_uid != root_uid && /* Not root, and */
3989 !f.running_in_test_harness /* Not fudged */
3991 expansion_test /* expansion testing */
3993 filter_test != FTEST_NONE) /* Filter testing */
3995 setgroups(group_count, group_list);
3996 exim_setugid(real_uid, real_gid, FALSE,
3997 US"-C, -D, -be or -bf forces real uid");
3998 removed_privilege = TRUE;
4000 /* In the normal case when Exim is called like this, stderr is available
4001 and should be used for any logging information because attempts to write
4002 to the log will usually fail. To arrange this, we unset really_exim. However,
4003 if no stderr is available there is no point - we might as well have a go
4004 at the log (if it fails, syslog will be written).
4006 Note that if the invoker is Exim, the logs remain available. Messing with
4007 this causes unlogged successful deliveries. */
4009 if (log_stderr && real_uid != exim_uid)
4010 f.really_exim = FALSE;
4013 /* Privilege is to be retained for the moment. It may be dropped later,
4014 depending on the job that this Exim process has been asked to do. For now, set
4015 the real uid to the effective so that subsequent re-execs of Exim are done by a
4019 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4021 /* If testing a filter, open the file(s) now, before wasting time doing other
4022 setups and reading the message. */
4024 if (filter_test & FTEST_SYSTEM)
4025 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4026 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4029 if (filter_test & FTEST_USER)
4030 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4031 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4034 /* Initialise lookup_list
4035 If debugging, already called above via version reporting.
4036 In either case, we initialise the list of available lookups while running
4037 as root. All dynamically modules are loaded from a directory which is
4038 hard-coded into the binary and is code which, if not a module, would be
4039 part of Exim already. Ability to modify the content of the directory
4040 is equivalent to the ability to modify a setuid binary!
4042 This needs to happen before we read the main configuration. */
4045 /*XXX this excrescence could move to the testsuite standard config setup file */
4047 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4050 /* Read the main runtime configuration data; this gives up if there
4051 is a failure. It leaves the configuration file open so that the subsequent
4052 configuration data for delivery can be read if needed.
4054 NOTE: immediately after opening the configuration file we change the working
4055 directory to "/"! Later we change to $spool_directory. We do it there, because
4056 during readconf_main() some expansion takes place already. */
4058 /* Store the initial cwd before we change directories. Can be NULL if the
4059 dir has already been unlinked. */
4060 initial_cwd = os_getcwd(NULL, 0);
4061 if (!initial_cwd && errno)
4062 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4064 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4065 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4068 -be[m] expansion test -
4069 -b[fF] filter test new
4071 -bmalware malware_test_file new
4073 -brw rewrite test new
4075 -bv[s] address verify -
4077 -bP <option> (except -bP config, which sets list_config)
4079 If any of these options is set, we suppress warnings about configuration
4080 issues (currently about tls_advertise_hosts and keep_environment not being
4084 int old_pool = store_pool;
4085 #ifdef MEASURE_TIMING
4087 (void)gettimeofday(&t0, NULL);
4090 store_pool = POOL_CONFIG;
4091 readconf_main(checking || list_options);
4092 store_pool = old_pool;
4094 #ifdef MEASURE_TIMING
4095 report_time_since(&t0, US"readconf_main (delta)");
4099 /* Now in directory "/" */
4101 if (cleanup_environment() == FALSE)
4102 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4105 /* If an action on specific messages is requested, or if a daemon or queue
4106 runner is being started, we need to know if Exim was called by an admin user.
4107 This is the case if the real user is root or exim, or if the real group is
4108 exim, or if one of the supplementary groups is exim or a group listed in
4109 admin_groups. We don't fail all message actions immediately if not admin_user,
4110 since some actions can be performed by non-admin users. Instead, set admin_user
4111 for later interrogation. */
4113 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4114 f.admin_user = TRUE;
4116 for (int i = 0; i < group_count && !f.admin_user; i++)
4117 if (group_list[i] == exim_gid)
4118 f.admin_user = TRUE;
4119 else if (admin_groups)
4120 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4121 if (admin_groups[j] == group_list[i])
4122 f.admin_user = TRUE;
4124 /* Another group of privileged users are the trusted users. These are root,
4125 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4126 are permitted to specify sender_addresses with -f on the command line, and
4127 other message parameters as well. */
4129 if (real_uid == root_uid || real_uid == exim_uid)
4130 f.trusted_caller = TRUE;
4134 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4135 if (trusted_users[i] == real_uid)
4136 f.trusted_caller = TRUE;
4139 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4140 if (trusted_groups[i] == real_gid)
4141 f.trusted_caller = TRUE;
4142 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4143 if (trusted_groups[i] == group_list[j])
4144 f.trusted_caller = TRUE;
4147 /* At this point, we know if the user is privileged and some command-line
4148 options become possibly impermissible, depending upon the configuration file. */
4150 if (checking && commandline_checks_require_admin && !f.admin_user)
4151 exim_fail("exim: those command-line flags are set to require admin\n");
4153 /* Handle the decoding of logging options. */
4155 decode_bits(log_selector, log_selector_size, log_notall,
4156 log_selector_string, log_options, log_options_count, US"log", 0);
4160 debug_printf("configuration file is %s\n", config_main_filename);
4161 debug_printf("log selectors =");
4162 for (int i = 0; i < log_selector_size; i++)
4163 debug_printf(" %08x", log_selector[i]);
4167 /* If domain literals are not allowed, check the sender address that was
4168 supplied with -f. Ditto for a stripped trailing dot. */
4172 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4173 exim_fail("exim: bad -f address \"%s\": domain literals not "
4174 "allowed\n", sender_address);
4175 if (f_end_dot && !strip_trailing_dot)
4176 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4177 "(trailing dot not allowed)\n", sender_address);
4180 /* See if an admin user overrode our logging. */
4182 if (cmdline_syslog_name)
4185 syslog_processname = cmdline_syslog_name;
4186 log_file_path = string_copy(CUS"syslog");
4189 /* not a panic, non-privileged users should not be able to spam paniclog */
4191 "exim: you lack sufficient privilege to specify syslog process name\n");
4193 /* Paranoia check of maximum lengths of certain strings. There is a check
4194 on the length of the log file path in log.c, which will come into effect
4195 if there are any calls to write the log earlier than this. However, if we
4196 get this far but the string is very long, it is better to stop now than to
4197 carry on and (e.g.) receive a message and then have to collapse. The call to
4198 log_write() from here will cause the ultimate panic collapse if the complete
4199 file name exceeds the buffer length. */
4201 if (Ustrlen(log_file_path) > 200)
4202 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4203 "log_file_path is longer than 200 chars: aborting");
4205 if (Ustrlen(pid_file_path) > 200)
4206 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4207 "pid_file_path is longer than 200 chars: aborting");
4209 if (Ustrlen(spool_directory) > 200)
4210 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4211 "spool_directory is longer than 200 chars: aborting");
4213 /* Length check on the process name given to syslog for its TAG field,
4214 which is only permitted to be 32 characters or less. See RFC 3164. */
4216 if (Ustrlen(syslog_processname) > 32)
4217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4218 "syslog_processname is longer than 32 chars: aborting");
4223 log_write(0, LOG_MAIN, "%s", log_oneline);
4224 return EXIT_SUCCESS;
4227 return EXIT_FAILURE;
4229 /* In some operating systems, the environment variable TMPDIR controls where
4230 temporary files are created; Exim doesn't use these (apart from when delivering
4231 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4232 If TMPDIR is found in the environment, reset it to the value defined in the
4233 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4234 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4235 EXIM_TMPDIR by the build scripts.
4239 if (environ) for (uschar ** p = USS environ; *p; p++)
4240 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4242 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4243 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4245 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4249 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4250 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4251 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4252 called by a user who has set the TZ variable. This then affects the timestamps
4253 in log files and in Received: headers, and any created Date: header lines. The
4254 required timezone is settable in the configuration file, so nothing can be done
4255 about this earlier - but hopefully nothing will normally be logged earlier than
4256 this. We have to make a new environment if TZ is wrong, but don't bother if
4257 timestamps_utc is set, because then all times are in UTC anyway. */
4259 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4260 f.timestamps_utc = TRUE;
4263 uschar *envtz = US getenv("TZ");
4265 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4266 : timezone_string != NULL
4269 uschar **p = USS environ;
4273 if (environ) while (*p++) count++;
4274 if (!envtz) count++;
4275 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4276 if (environ) for (p = USS environ; *p; p++)
4277 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4278 if (timezone_string)
4280 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4281 sprintf(CS *newp++, "TZ=%s", timezone_string);
4286 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4287 tod_stamp(tod_log));
4291 /* Handle the case when we have removed the setuid privilege because of -C or
4292 -D. This means that the caller of Exim was not root.
4294 There is a problem if we were running as the Exim user. The sysadmin may
4295 expect this case to retain privilege because "the binary was called by the
4296 Exim user", but it hasn't, because either the -D option set macros, or the
4297 -C option set a non-trusted configuration file. There are two possibilities:
4299 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4300 to do message deliveries. Thus, the fact that it is running as a
4301 non-privileged user is plausible, and might be wanted in some special
4302 configurations. However, really_exim will have been set false when
4303 privilege was dropped, to stop Exim trying to write to its normal log
4304 files. Therefore, re-enable normal log processing, assuming the sysadmin
4305 has set up the log directory correctly.
4307 (2) If deliver_drop_privilege is not set, the configuration won't work as
4308 apparently intended, and so we log a panic message. In order to retain
4309 root for -C or -D, the caller must either be root or be invoking a
4310 trusted configuration file (when deliver_drop_privilege is false). */
4312 if ( removed_privilege
4313 && (!f.trusted_config || opt_D_used)
4314 && real_uid == exim_uid)
4315 if (deliver_drop_privilege)
4316 f.really_exim = TRUE; /* let logging work normally */
4318 log_write(0, LOG_MAIN|LOG_PANIC,
4319 "exim user lost privilege for using %s option",
4320 f.trusted_config? "-D" : "-C");
4322 /* Start up Perl interpreter if Perl support is configured and there is a
4323 perl_startup option, and the configuration or the command line specifies
4324 initializing starting. Note that the global variables are actually called
4325 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4328 if (perl_start_option != 0)
4329 opt_perl_at_start = (perl_start_option > 0);
4330 if (opt_perl_at_start && opt_perl_startup != NULL)
4333 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4334 if ((errstr = init_perl(opt_perl_startup)))
4335 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4336 opt_perl_started = TRUE;
4338 #endif /* EXIM_PERL */
4340 /* Log the arguments of the call if the configuration file said so. This is
4341 a debugging feature for finding out what arguments certain MUAs actually use.
4342 Don't attempt it if logging is disabled, or if listing variables or if
4343 verifying/testing addresses or expansions. */
4345 if ( (debug_selector & D_any || LOGGING(arguments))
4346 && f.really_exim && !list_options && !checking)
4348 uschar *p = big_buffer;
4349 Ustrcpy(p, US"cwd= (failed)");
4356 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4357 p += Ustrlen(CCS p);
4360 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4362 for (int i = 0; i < argc; i++)
4364 int len = Ustrlen(argv[i]);
4365 const uschar *printing;
4367 if (p + len + 8 >= big_buffer + big_buffer_size)
4369 Ustrcpy(p, US" ...");
4370 log_write(0, LOG_MAIN, "%s", big_buffer);
4371 Ustrcpy(big_buffer, US"...");
4374 printing = string_printing(argv[i]);
4375 if (!*printing) quote = US"\"";
4378 const uschar *pp = printing;
4380 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4382 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4383 (p - big_buffer) - 4), printing, quote);
4386 if (LOGGING(arguments))
4387 log_write(0, LOG_MAIN, "%s", big_buffer);
4389 debug_printf("%s\n", big_buffer);
4392 /* Set the working directory to be the top-level spool directory. We don't rely
4393 on this in the code, which always uses fully qualified names, but it's useful
4394 for core dumps etc. Don't complain if it fails - the spool directory might not
4395 be generally accessible and calls with the -C option (and others) have lost
4396 privilege by now. Before the chdir, we try to ensure that the directory exists.
4399 if (Uchdir(spool_directory) != 0)
4401 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4402 (void) Uchdir(spool_directory);
4405 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4406 alias file. Exim doesn't have such a concept, but this call is screwed into
4407 Sun's YP makefiles. Handle this by calling a configured script, as the real
4408 user who called Exim. The -oA option can be used to pass an argument to the
4413 (void) fclose(config_file);
4414 if (bi_command && *bi_command)
4418 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4419 if (alias_arg) argv[i++] = alias_arg;
4422 setgroups(group_count, group_list);
4423 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4425 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4426 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4428 execv(CS argv[0], (char *const *)argv);
4429 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4433 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4438 /* We moved the admin/trusted check to be immediately after reading the
4439 configuration file. We leave these prints here to ensure that syslog setup,
4440 logfile setup, and so on has already happened. */
4442 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4443 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4445 /* Only an admin user may start the daemon or force a queue run in the default
4446 configuration, but the queue run restriction can be relaxed. Only an admin
4447 user may request that a message be returned to its sender forthwith. Only an
4448 admin user may specify a debug level greater than D_v (because it might show
4449 passwords, etc. in lookup queries). Only an admin user may request a queue
4450 count. Only an admin user can use the test interface to scan for email
4451 (because Exim will be in the spool dir and able to look at mails). */
4455 BOOL debugset = (debug_selector & ~D_v) != 0;
4456 if ( deliver_give_up || f.daemon_listen || malware_test_file
4457 || count_queue && queue_list_requires_admin
4458 || list_queue && queue_list_requires_admin
4459 || qrunners && prod_requires_admin
4460 || queue_name_dest && prod_requires_admin
4461 || debugset && !f.running_in_test_harness
4463 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4466 /* If the real user is not root or the exim uid, the argument for passing
4467 in an open TCP/IP connection for another message is not permitted, nor is
4468 running with the -N option for any delivery action, unless this call to exim is
4469 one that supplied an input message, or we are using a patched exim for
4470 regression testing. */
4472 if ( real_uid != root_uid && real_uid != exim_uid
4473 && ( continue_hostname
4475 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4477 && !f.running_in_test_harness
4479 exim_fail("exim: Permission denied\n");
4481 /* If the caller is not trusted, certain arguments are ignored when running for
4482 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4483 Note that authority for performing certain actions on messages is tested in the
4484 queue_action() function. */
4486 if (!f.trusted_caller && !checking)
4488 sender_host_name = sender_host_address = interface_address =
4489 sender_ident = received_protocol = NULL;
4490 sender_host_port = interface_port = 0;
4491 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4494 /* If a sender host address is set, extract the optional port number off the
4495 end of it and check its syntax. Do the same thing for the interface address.
4496 Exim exits if the syntax is bad. */
4500 if (sender_host_address)
4501 sender_host_port = check_port(sender_host_address);
4502 if (interface_address)
4503 interface_port = check_port(interface_address);
4506 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4509 if (f.trusted_caller)
4511 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4512 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4515 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4518 /* If an SMTP message is being received check to see if the standard input is a
4519 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4520 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4525 union sockaddr_46 inetd_sock;
4526 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4527 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4529 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4530 if (family == AF_INET || family == AF_INET6)
4532 union sockaddr_46 interface_sock;
4533 size = sizeof(interface_sock);
4535 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4536 interface_address = host_ntoa(-1, &interface_sock, NULL,
4539 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4541 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4544 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4545 NULL, &sender_host_port);
4546 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4547 "inetd is not supported when mua_wrapper is set");
4551 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4556 /* If the load average is going to be needed while receiving a message, get it
4557 now for those OS that require the first call to os_getloadavg() to be done as
4558 root. There will be further calls later for each message received. */
4560 #ifdef LOAD_AVG_NEEDS_ROOT
4561 if ( receiving_message
4562 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4563 load_average = OS_GETLOADAVG();
4566 /* The queue_only configuration option can be overridden by -odx on the command
4567 line, except that if queue_only_override is false, queue_only cannot be unset
4568 from the command line. */
4570 if (queue_only_set && (queue_only_override || arg_queue_only))
4571 queue_only = arg_queue_only;
4573 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4576 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4577 if (arg_smtp_receive_timeout >= 0)
4578 smtp_receive_timeout = arg_smtp_receive_timeout;
4580 /* If Exim was started with root privilege, unless we have already removed the
4581 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4582 except when starting the daemon or doing some kind of delivery or address
4583 testing (-bt). These are the only cases when root need to be retained. We run
4584 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4585 retained only for starting the daemon. We always do the initgroups() in this
4586 situation (controlled by the TRUE below), in order to be as close as possible
4587 to the state Exim usually runs in. */
4589 if ( !unprivileged /* originally had root AND */
4590 && !removed_privilege /* still got root AND */
4591 && !f.daemon_listen /* not starting the daemon */
4592 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4593 && ( /* AND EITHER */
4594 deliver_drop_privilege /* requested unprivileged */
4596 !qrunners /* not running the queue */
4597 && ( msg_action_arg < 0 /* and */
4598 || msg_action != MSG_DELIVER /* not delivering */
4600 && (!checking || !f.address_test_mode) /* not address checking */
4601 && !rcpt_verify_quota /* and not quota checking */
4603 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4605 /* When we are retaining a privileged uid, we still change to the exim gid. */
4610 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4611 rv = setgid(exim_gid);
4612 /* Impact of failure is that some stuff might end up with an incorrect group.
4613 We track this for failures from root, since any attempt to change privilege
4614 by root should succeed and failures should be examined. For non-root,
4615 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4616 no need to complain then. */
4618 if (!(unprivileged || removed_privilege))
4619 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4622 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4623 (long int)exim_gid, strerror(errno));
4627 /* Handle a request to scan a file for malware */
4628 if (malware_test_file)
4630 #ifdef WITH_CONTENT_SCAN
4632 set_process_info("scanning file for malware");
4633 if ((result = malware_in_file(malware_test_file)) == FAIL)
4635 printf("No malware found.\n");
4640 printf("Malware lookup returned non-okay/fail: %d\n", result);
4644 printf("Malware found: %s\n", malware_name);
4646 printf("Malware scan detected malware of unknown name.\n");
4648 printf("Malware scanning not enabled at compile time.\n");
4653 /* Handle a request to list the delivery queue */
4657 set_process_info("listing the queue");
4658 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4662 /* Handle a request to count the delivery queue */
4666 set_process_info("counting the queue");
4667 fprintf(stdout, "%u\n", queue_count());
4671 /* Handle actions on specific messages, except for the force delivery and
4672 message load actions, which are done below. Some actions take a whole list of
4673 message ids, which are known to continue up to the end of the arguments. Others
4674 take a single message id and then operate on the recipients list. */
4676 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4678 int yield = EXIT_SUCCESS;
4679 set_process_info("acting on specified messages");
4681 /* ACL definitions may be needed when removing a message (-Mrm) because
4682 event_action gets expanded */
4684 if (msg_action == MSG_REMOVE)
4686 int old_pool = store_pool;
4687 store_pool = POOL_CONFIG;
4689 store_pool = old_pool;
4690 store_writeprotect(POOL_CONFIG);
4693 if (!one_msg_action)
4695 for (i = msg_action_arg; i < argc; i++)
4696 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4697 yield = EXIT_FAILURE;
4700 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4701 default: printf("\n"); break;
4705 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4706 recipients_arg)) yield = EXIT_FAILURE;
4710 /* We used to set up here to skip reading the ACL section, on
4711 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4712 Now, since the intro of the ${acl } expansion, ACL definitions may be
4713 needed in transports so we lost the optimisation. */
4716 int old_pool = store_pool;
4717 #ifdef MEASURE_TIMING
4719 (void)gettimeofday(&t0, NULL);
4722 store_pool = POOL_CONFIG;
4724 store_pool = old_pool;
4726 /* -be can add macro definitions, needing to link to the macro structure
4727 chain. Otherwise, make the memory used for config data readonly. */
4729 if (!expansion_test)
4730 store_writeprotect(POOL_CONFIG);
4732 #ifdef MEASURE_TIMING
4733 report_time_since(&t0, US"readconf_rest (delta)");
4737 /* Handle a request to check quota */
4738 if (rcpt_verify_quota)
4739 if (real_uid != root_uid && real_uid != exim_uid)
4740 exim_fail("exim: Permission denied\n");
4741 else if (recipients_arg >= argc)
4742 exim_fail("exim: missing recipient for quota check\n");
4745 verify_quota(argv[recipients_arg]);
4746 exim_exit(EXIT_SUCCESS);
4749 /* Handle the -brt option. This is for checking out retry configurations.
4750 The next three arguments are a domain name or a complete address, and
4751 optionally two error numbers. All it does is to call the function that
4752 scans the retry configuration data. */
4754 if (test_retry_arg >= 0)
4756 retry_config *yield;
4757 int basic_errno = 0;
4759 const uschar *s1, *s2;
4761 if (test_retry_arg >= argc)
4763 printf("-brt needs a domain or address argument\n");
4764 exim_exit(EXIT_FAILURE);
4766 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4769 /* If the first argument contains no @ and no . it might be a local user
4770 or it might be a single-component name. Treat as a domain. */
4772 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4774 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4775 "being \ntreated as a one-component domain, not as a local part.\n\n",
4779 /* There may be an optional second domain arg. */
4781 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4782 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4784 /* The final arg is an error name */
4786 if (test_retry_arg < argc)
4788 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4790 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4793 printf("%s\n", CS error);
4794 return EXIT_FAILURE;
4797 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4798 code > 100 as an error is for matching codes to the decade. Turn them into
4799 a real error code, off the decade. */
4801 if (basic_errno == ERRNO_MAIL4XX ||
4802 basic_errno == ERRNO_RCPT4XX ||
4803 basic_errno == ERRNO_DATA4XX)
4805 int code = (more_errno >> 8) & 255;
4807 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4808 else if (code > 100)
4809 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4813 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4814 printf("No retry information found\n");
4817 more_errno = yield->more_errno;
4818 printf("Retry rule: %s ", yield->pattern);
4820 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4822 printf("quota%s%s ",
4823 (more_errno > 0)? "_" : "",
4824 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4826 else if (yield->basic_errno == ECONNREFUSED)
4828 printf("refused%s%s ",
4829 (more_errno > 0)? "_" : "",
4830 (more_errno == 'M')? "MX" :
4831 (more_errno == 'A')? "A" : "");
4833 else if (yield->basic_errno == ETIMEDOUT)
4836 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4838 if (more_errno != 0) printf("_%s",
4839 (more_errno == 'M')? "MX" : "A");
4842 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4843 printf("auth_failed ");
4846 for (retry_rule * r = yield->rules; r; r = r->next)
4848 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4849 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4855 printf(",%d.", x/1000);
4869 exim_exit(EXIT_SUCCESS);
4872 /* Handle a request to list one or more configuration options */
4873 /* If -n was set, we suppress some information */
4878 set_process_info("listing variables");
4879 if (recipients_arg >= argc)
4880 fail = !readconf_print(US"all", NULL, flag_n);
4881 else for (i = recipients_arg; i < argc; i++)
4884 (Ustrcmp(argv[i], "router") == 0 ||
4885 Ustrcmp(argv[i], "transport") == 0 ||
4886 Ustrcmp(argv[i], "authenticator") == 0 ||
4887 Ustrcmp(argv[i], "macro") == 0 ||
4888 Ustrcmp(argv[i], "environment") == 0))
4890 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4894 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4896 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4901 set_process_info("listing config");
4902 exim_exit(readconf_print(US"config", NULL, flag_n)
4903 ? EXIT_SUCCESS : EXIT_FAILURE);
4907 /* Initialise subsystems as required. */
4911 /* Handle a request to deliver one or more messages that are already on the
4912 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4913 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4915 Delivery of specific messages is typically used for a small number when
4916 prodding by hand (when the option forced_delivery will be set) or when
4917 re-execing to regain root privilege. Each message delivery must happen in a
4918 separate process, so we fork a process for each one, and run them sequentially
4919 so that debugging output doesn't get intertwined, and to avoid spawning too
4920 many processes if a long list is given. However, don't fork for the last one;
4921 this saves a process in the common case when Exim is called to deliver just one
4924 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4926 if (prod_requires_admin && !f.admin_user)
4928 fprintf(stderr, "exim: Permission denied\n");
4929 exim_exit(EXIT_FAILURE);
4931 set_process_info("delivering specified messages");
4932 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4933 for (i = msg_action_arg; i < argc; i++)
4937 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4938 that runs into a later copy into the untainted global message_id[] */
4939 /*XXX Do we need a length limit check here? */
4941 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4942 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4944 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4945 exim_underbar_exit(EXIT_SUCCESS);
4949 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4951 exim_exit(EXIT_FAILURE);
4955 exim_exit(EXIT_SUCCESS);
4959 /* If only a single queue run is requested, without SMTP listening, we can just
4960 turn into a queue runner, with an optional starting message id. */
4962 if (is_onetime_qrun() && !f.daemon_listen)
4964 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
4965 exim_exit(EXIT_SUCCESS);
4969 /* Find the login name of the real user running this process. This is always
4970 needed when receiving a message, because it is written into the spool file. It
4971 may also be used to construct a from: or a sender: header, and in this case we
4972 need the user's full name as well, so save a copy of it, checked for RFC822
4973 syntax and munged if necessary, if it hasn't previously been set by the -F
4974 argument. We may try to get the passwd entry more than once, in case NIS or
4975 other delays are in evidence. Save the home directory for use in filter testing
4980 if ((pw = getpwuid(real_uid)) != NULL)
4982 originator_login = string_copy(US pw->pw_name);
4983 originator_home = string_copy(US pw->pw_dir);
4985 /* If user name has not been set by -F, set it from the passwd entry
4986 unless -f has been used to set the sender address by a trusted user. */
4988 if (!originator_name)
4990 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4992 uschar *name = US pw->pw_gecos;
4993 uschar *amp = Ustrchr(name, '&');
4996 /* Most Unix specify that a '&' character in the gecos field is
4997 replaced by a copy of the login name, and some even specify that
4998 the first character should be upper cased, so that's what we do. */
5003 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5004 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5005 buffer[loffset] = toupper(buffer[loffset]);
5009 /* If a pattern for matching the gecos field was supplied, apply
5010 it and then expand the name string. */
5012 if (gecos_pattern && gecos_name)
5014 const pcre2_code *re;
5015 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5017 if (regex_match_and_setup(re, name, 0, -1))
5019 uschar *new_name = expand_string(gecos_name);
5023 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5024 "gecos field \"%s\"\n", new_name, name);
5027 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5028 "\"%s\": %s\n", gecos_name, expand_string_message);
5030 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5031 "gecos field \"%s\"\n", gecos_pattern, name);
5032 store_free((void *)re);
5034 originator_name = string_copy(name);
5037 /* A trusted caller has used -f but not -F */
5039 else originator_name = US"";
5042 /* Break the retry loop */
5047 if (++i > finduser_retries) break;
5051 /* If we cannot get a user login, log the incident and give up, unless the
5052 configuration specifies something to use. When running in the test harness,
5053 any setting of unknown_login overrides the actual name. */
5055 if (!originator_login || f.running_in_test_harness)
5059 originator_login = expand_string(unknown_login);
5060 if (!originator_name && unknown_username)
5061 originator_name = expand_string(unknown_username);
5062 if (!originator_name) originator_name = US"";
5064 if (!originator_login)
5065 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5069 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5072 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5074 /* If a message is created by this call of Exim, the uid/gid of its originator
5075 are those of the caller. These values are overridden if an existing message is
5076 read in from the spool. */
5078 originator_uid = real_uid;
5079 originator_gid = real_gid;
5081 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5082 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5084 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5085 returns. We leave this till here so that the originator_ fields are available
5086 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5089 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5093 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5094 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5095 "mua_wrapper is set");
5098 # ifndef DISABLE_TLS
5099 /* This also checks that the library linkage is working and we can call
5100 routines in it, so call even if tls_require_ciphers is unset */
5102 # ifdef MEASURE_TIMING
5104 (void)gettimeofday(&t0, NULL);
5106 if (!tls_dropprivs_validate_require_cipher(FALSE))
5108 # ifdef MEASURE_TIMING
5109 report_time_since(&t0, US"validate_ciphers (delta)");
5117 /* If the sender ident has not been set (by a trusted caller) set it to
5118 the caller. This will get overwritten below for an inetd call. If a trusted
5119 caller has set it empty, unset it. */
5121 if (!sender_ident) sender_ident = originator_login;
5122 else if (!*sender_ident) sender_ident = NULL;
5124 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5125 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5126 originator_* variables set. */
5128 if (test_rewrite_arg >= 0)
5130 f.really_exim = FALSE;
5131 if (test_rewrite_arg >= argc)
5133 printf("-brw needs an address argument\n");
5134 exim_exit(EXIT_FAILURE);
5136 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5137 exim_exit(EXIT_SUCCESS);
5140 /* A locally-supplied message is considered to be coming from a local user
5141 unless a trusted caller supplies a sender address with -f, or is passing in the
5142 message via SMTP (inetd invocation or otherwise). */
5144 if ( !sender_address && !smtp_input
5145 || !f.trusted_caller && filter_test == FTEST_NONE)
5147 f.sender_local = TRUE;
5149 /* A trusted caller can supply authenticated_sender and authenticated_id
5150 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5151 defaults except when host checking. */
5153 if (!authenticated_sender && !host_checking)
5154 authenticated_sender = string_sprintf("%s@%s", originator_login,
5155 qualify_domain_sender);
5156 if (!authenticated_id && !host_checking)
5157 authenticated_id = originator_login;
5160 /* Trusted callers are always permitted to specify the sender address.
5161 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5162 is specified is the empty address. However, if a trusted caller does not
5163 specify a sender address for SMTP input, we leave sender_address unset. This
5164 causes the MAIL commands to be honoured. */
5166 if ( !smtp_input && !sender_address
5167 || !receive_check_set_sender(sender_address))
5169 /* Either the caller is not permitted to set a general sender, or this is
5170 non-SMTP input and the trusted caller has not set a sender. If there is no
5171 sender, or if a sender other than <> is set, override with the originator's
5172 login (which will get qualified below), except when checking things. */
5174 if ( !sender_address /* No sender_address set */
5176 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5177 !checking)) /* Not running tests, including filter tests */
5179 sender_address = originator_login;
5180 f.sender_address_forced = FALSE;
5181 sender_address_domain = 0;
5185 /* Remember whether an untrusted caller set the sender address */
5187 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5189 /* Ensure that the sender address is fully qualified unless it is the empty
5190 address, which indicates an error message, or doesn't exist (root caller, smtp
5191 interface, no -f argument). */
5193 if (sender_address && *sender_address && sender_address_domain == 0)
5194 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5195 qualify_domain_sender);
5197 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5199 /* Handle a request to verify a list of addresses, or test them for delivery.
5200 This must follow the setting of the sender address, since routers can be
5201 predicated upon the sender. If no arguments are given, read addresses from
5202 stdin. Set debug_level to at least D_v to get full output for address testing.
5205 if (verify_address_mode || f.address_test_mode)
5208 int flags = vopt_qualify;
5210 if (verify_address_mode)
5212 if (!verify_as_sender) flags |= vopt_is_recipient;
5213 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5218 flags |= vopt_is_recipient;
5219 debug_selector |= D_v;
5220 debug_file = stderr;
5221 debug_fd = fileno(debug_file);
5222 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5225 if (recipients_arg < argc)
5226 while (recipients_arg < argc)
5228 /* Supplied addresses are tainted since they come from a user */
5229 uschar * s = string_copy_taint(
5230 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5234 BOOL finished = FALSE;
5235 uschar *ss = parse_find_address_end(s, FALSE);
5236 if (*ss == ',') *ss = 0; else finished = TRUE;
5237 test_address(s, flags, &exit_value);
5240 while (*++s == ',' || isspace(*s)) ;
5246 uschar * s = get_stdinput(NULL, NULL);
5248 test_address(string_copy_taint(
5249 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5251 flags, &exit_value);
5255 exim_exit(exit_value);
5258 /* Handle expansion checking. Either expand items on the command line, or read
5259 from stdin if there aren't any. If -Mset was specified, load the message so
5260 that its variables can be used, but restrict this facility to admin users.
5261 Otherwise, if -bem was used, read a message from stdin. */
5265 dns_init(FALSE, FALSE, FALSE);
5266 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5270 exim_fail("exim: permission denied\n");
5271 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5272 /* Checking the length of the ID is sufficient to validate it.
5273 Get an untainted version so file opens can be done. */
5274 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5276 spoolname = string_sprintf("%s-H", message_id);
5277 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5278 printf ("Failed to load message datafile %s\n", message_id);
5279 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5280 printf ("Failed to load message %s\n", message_id);
5283 /* Read a test message from a file. We fudge it up to be on stdin, saving
5284 stdin itself for later reading of expansion strings. */
5286 else if (expansion_test_message)
5288 int save_stdin = dup(0);
5289 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5291 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5294 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5295 message_ended = END_NOTENDED;
5296 read_message_body(receive_msg(extract_recipients));
5297 message_linecount += body_linecount;
5298 (void)dup2(save_stdin, 0);
5299 (void)close(save_stdin);
5300 clearerr(stdin); /* Required by Darwin */
5303 /* Only admin users may see config-file macros this way */
5305 if (!f.admin_user) macros_user = macros = mlast = NULL;
5307 /* Allow $recipients for this testing */
5309 f.enable_dollar_recipients = TRUE;
5311 /* Expand command line items */
5313 if (recipients_arg < argc)
5314 while (recipients_arg < argc)
5315 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5321 char *(*fn_readline)(const char *) = NULL;
5322 void (*fn_addhist)(const char *) = NULL;
5326 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5329 while (s = get_stdinput(fn_readline, fn_addhist))
5330 expansion_test_line(s);
5333 if (dlhandle) dlclose(dlhandle);
5337 /* The data file will be open after -Mset */
5339 if (deliver_datafile >= 0)
5341 (void)close(deliver_datafile);
5342 deliver_datafile = -1;
5345 exim_exit(EXIT_SUCCESS);
5349 /* The active host name is normally the primary host name, but it can be varied
5350 for hosts that want to play several parts at once. We need to ensure that it is
5351 set for host checking, and for receiving messages. */
5353 smtp_active_hostname = primary_hostname;
5354 if (raw_active_hostname != NULL)
5356 uschar *nah = expand_string(raw_active_hostname);
5359 if (!f.expand_string_forcedfail)
5360 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5361 "(smtp_active_hostname): %s", raw_active_hostname,
5362 expand_string_message);
5364 else if (nah[0] != 0) smtp_active_hostname = nah;
5367 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5368 given IP address so that the blocking and relay configuration can be tested.
5369 Unless a sender_ident was set by -oMt, we discard it (the default is the
5370 caller's login name). An RFC 1413 call is made only if we are running in the
5371 test harness and an incoming interface and both ports are specified, because
5372 there is no TCP/IP call to find the ident for. */
5379 if (!sender_ident_set)
5381 sender_ident = NULL;
5382 if (f.running_in_test_harness && sender_host_port
5383 && interface_address && interface_port)
5384 verify_get_ident(1223); /* note hardwired port number */
5387 /* In case the given address is a non-canonical IPv6 address, canonicalize
5388 it. The code works for both IPv4 and IPv6, as it happens. */
5390 size = host_aton(sender_host_address, x);
5391 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5392 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5394 /* Now set up for testing */
5396 host_build_sender_fullhost();
5400 f.sender_local = FALSE;
5401 f.sender_host_notsocket = TRUE;
5402 debug_file = stderr;
5403 debug_fd = fileno(debug_file);
5404 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5405 "**** but without any ident (RFC 1413) callback.\n"
5406 "**** This is not for real!\n\n",
5407 sender_host_address);
5409 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5410 if (verify_check_host(&hosts_connection_nolog) == OK)
5412 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5413 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5415 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5417 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5418 because a log line has already been written for all its failure exists
5419 (usually "connection refused: <reason>") and writing another one is
5420 unnecessary clutter. */
5422 if (smtp_start_session())
5425 for (; (reset_point = store_mark()); store_reset(reset_point))
5427 if (smtp_setup_msg() <= 0) break;
5428 if (!receive_msg(FALSE)) break;
5430 return_path = sender_address = NULL;
5431 dnslist_domain = dnslist_matched = NULL;
5432 #ifndef DISABLE_DKIM
5433 dkim_cur_signer = NULL;
5436 deliver_localpart_orig = NULL;
5437 deliver_domain_orig = NULL;
5438 callout_address = sending_ip_address = NULL;
5439 deliver_localpart_data = deliver_domain_data =
5440 recipient_data = sender_data = NULL;
5441 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5445 exim_exit(EXIT_SUCCESS);
5449 /* Arrange for message reception if recipients or SMTP were specified;
5450 otherwise complain unless a version print (-bV) happened or this is a filter
5451 verification test or info dump.
5452 In the former case, show the configuration file name. */
5454 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5456 if (version_printed)
5458 if (Ustrchr(config_main_filelist, ':'))
5459 printf("Configuration file search path is %s\n", config_main_filelist);
5460 printf("Configuration file is %s\n", config_main_filename);
5461 return EXIT_SUCCESS;
5464 if (info_flag != CMDINFO_NONE)
5466 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5467 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5470 if (filter_test == FTEST_NONE)
5471 exim_usage(called_as);
5475 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5476 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5477 that we are not called from inetd, because that is rejected above. The
5478 following configuration settings are forced here:
5480 (1) Synchronous delivery (-odi)
5481 (2) Errors to stderr (-oep == -oeq)
5482 (3) No parallel remote delivery
5483 (4) Unprivileged delivery
5485 We don't force overall queueing options because there are several of them;
5486 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5487 to override any SMTP queueing. */
5491 f.synchronous_delivery = TRUE;
5492 arg_error_handling = ERRORS_STDERR;
5493 remote_max_parallel = 1;
5494 deliver_drop_privilege = TRUE;
5495 f.queue_smtp = FALSE;
5496 queue_smtp_domains = NULL;
5498 message_utf8_downconvert = -1; /* convert-if-needed */
5503 /* Prepare to accept one or more new messages on the standard input. When a
5504 message has been read, its id is returned in message_id[]. If doing immediate
5505 delivery, we fork a delivery process for each received message, except for the
5506 last one, where we can save a process switch.
5508 It is only in non-smtp mode that error_handling is allowed to be changed from
5509 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5510 sendmail error modes other than -oem ever actually used? Later: yes.) */
5512 if (!smtp_input) error_handling = arg_error_handling;
5514 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5515 logging being sent down the socket and make an identd call to get the
5518 else if (f.is_inetd)
5520 (void)fclose(stderr);
5521 exim_nullstd(); /* Re-open to /dev/null */
5522 verify_get_ident(IDENT_PORT);
5523 host_build_sender_fullhost();
5524 set_process_info("handling incoming connection from %s via inetd",
5528 /* If the sender host address has been set, build sender_fullhost if it hasn't
5529 already been done (which it will have been for inetd). This caters for the
5530 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5531 so that the test for IP options is skipped for -bs input. */
5533 if (sender_host_address && !sender_fullhost)
5535 host_build_sender_fullhost();
5536 set_process_info("handling incoming connection from %s via -oMa",
5538 f.sender_host_notsocket = TRUE;
5541 /* Otherwise, set the sender host as unknown except for inetd calls. This
5542 prevents host checking in the case of -bs not from inetd and also for -bS. */
5544 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5546 /* If stdout does not exist, then dup stdin to stdout. This can happen
5547 if exim is started from inetd. In this case fd 0 will be set to the socket,
5548 but fd 1 will not be set. This also happens for passed SMTP channels. */
5550 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5552 /* Set up the incoming protocol name and the state of the program. Root is
5553 allowed to force received protocol via the -oMr option above. If we have come
5554 via inetd, the process info has already been set up. We don't set
5555 received_protocol here for smtp input, as it varies according to
5556 batch/HELO/EHLO/AUTH/TLS. */
5560 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5561 smtp_batched_input? "batched " : "",
5562 sender_address ? sender_address : originator_login);
5566 int old_pool = store_pool;
5567 store_pool = POOL_PERM;
5568 if (!received_protocol)
5569 received_protocol = string_sprintf("local%s", called_as);
5570 store_pool = old_pool;
5571 set_process_info("accepting a local non-SMTP message from <%s>",
5575 /* Initialize the session_local_queue-only flag (this will be ignored if
5576 mua_wrapper is set) */
5579 session_local_queue_only = queue_only;
5581 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5582 the spool if so configured. On failure, we must not attempt to send an error
5583 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5584 error code is given.) */
5586 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5587 exim_fail("exim: insufficient disk space\n");
5589 /* If this is smtp input of any kind, real or batched, handle the start of the
5592 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5593 because a log line has already been written for all its failure exists
5594 (usually "connection refused: <reason>") and writing another one is
5595 unnecessary clutter. */
5601 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5602 if (verify_check_host(&hosts_connection_nolog) == OK)
5604 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5605 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5607 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5608 if (!smtp_start_session())
5611 exim_exit(EXIT_SUCCESS);
5615 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5616 (we handle buferring so as to have visibility of fill level). */
5620 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5621 if (expand_string_message)
5622 if (thismessage_size_limit == -1)
5623 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5624 "message_size_limit: %s", expand_string_message);
5626 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5627 "message_size_limit: %s", expand_string_message);
5629 setvbuf(stdin, NULL, _IONBF, 0);
5632 /* Loop for several messages when reading SMTP input. If we fork any child
5633 processes, we don't want to wait for them unless synchronous delivery is
5634 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5635 same as SIG_DFL, despite the fact that documentation often lists the default as
5636 "ignore". This is a confusing area. This is what I know:
5638 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5639 processes that complete simply to go away without ever becoming defunct. You
5640 can't then wait for them - but we don't want to wait for them in the
5641 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5642 happen for all OS (e.g. *BSD is different).
5644 But that's not the end of the story. Some (many? all?) systems have the
5645 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5646 has by default, so it seems that the difference is merely one of default
5647 (compare restarting vs non-restarting signals).
5649 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5650 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5651 of the loop below. Paranoia rules.
5653 February 2003: That's *still* not the end of the story. There are now versions
5654 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5655 process then calls waitpid(), a grumble is written to the system log, because
5656 this is logically inconsistent. In other words, it doesn't like the paranoia.
5657 As a consequence of this, the waitpid() below is now excluded if we are sure
5658 that SIG_IGN works. */
5660 if (!f.synchronous_delivery)
5663 struct sigaction act;
5664 act.sa_handler = SIG_IGN;
5665 sigemptyset(&(act.sa_mask));
5666 act.sa_flags = SA_NOCLDWAIT;
5667 sigaction(SIGCHLD, &act, NULL);
5669 signal(SIGCHLD, SIG_IGN);
5673 /* Save the current store pool point, for resetting at the start of
5674 each message, and save the real sender address, if any. */
5676 real_sender_address = sender_address;
5678 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5679 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5682 for (BOOL more = TRUE; more; )
5684 rmark reset_point = store_mark();
5687 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5688 input and build the recipients list, before calling receive_msg() to read the
5689 message proper. Whatever sender address is given in the SMTP transaction is
5690 often ignored for local senders - we use the actual sender, which is normally
5691 either the underlying user running this process or a -f argument provided by
5692 a trusted caller. It is saved in real_sender_address. The test for whether to
5693 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5698 if ((rc = smtp_setup_msg()) > 0)
5700 if (real_sender_address != NULL &&
5701 !receive_check_set_sender(sender_address))
5703 sender_address = raw_sender = real_sender_address;
5704 sender_address_unrewritten = NULL;
5707 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5708 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5709 the very end. The result of the ACL is ignored (as for other non-SMTP
5710 messages). It is run for its potential side effects. */
5712 if (smtp_batched_input && acl_not_smtp_start != NULL)
5714 uschar *user_msg, *log_msg;
5715 f.enable_dollar_recipients = TRUE;
5716 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5717 &user_msg, &log_msg);
5718 f.enable_dollar_recipients = FALSE;
5721 /* Now get the data for the message */
5723 more = receive_msg(extract_recipients);
5726 cancel_cutthrough_connection(TRUE, US"receive dropped");
5727 if (more) goto MORELOOP;
5728 smtp_log_no_mail(); /* Log no mail if configured */
5729 exim_exit(EXIT_FAILURE);
5734 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5735 smtp_log_no_mail(); /* Log no mail if configured */
5736 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5740 /* In the non-SMTP case, we have all the information from the command
5741 line, but must process it in case it is in the more general RFC822
5742 format, and in any case, to detect syntax errors. Also, it appears that
5743 the use of comma-separated lists as single arguments is common, so we
5744 had better support them. */
5749 int count = argc - recipients_arg;
5750 uschar **list = argv + recipients_arg;
5752 /* These options cannot be changed dynamically for non-SMTP messages */
5754 f.active_local_sender_retain = local_sender_retain;
5755 f.active_local_from_check = local_from_check;
5757 /* Save before any rewriting */
5759 raw_sender = string_copy(sender_address);
5761 /* Loop for each argument (supplied by user hence tainted) */
5763 for (int i = 0; i < count; i++)
5765 int start, end, domain;
5767 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5768 * We'll still want to cap it to something, just in case. */
5769 uschar * s = string_copy_taint(
5770 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5773 /* Loop for each comma-separated address */
5777 BOOL finished = FALSE;
5779 uschar *ss = parse_find_address_end(s, FALSE);
5781 if (*ss == ',') *ss = 0; else finished = TRUE;
5783 /* Check max recipients - if -t was used, these aren't recipients */
5785 if (recipients_max > 0 && ++rcount > recipients_max &&
5786 !extract_recipients)
5787 if (error_handling == ERRORS_STDERR)
5789 fprintf(stderr, "exim: too many recipients\n");
5790 exim_exit(EXIT_FAILURE);
5794 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5795 errors_sender_rc : EXIT_FAILURE;
5799 BOOL b = allow_utf8_domains;
5800 allow_utf8_domains = TRUE;
5803 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5807 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5808 else allow_utf8_domains = b;
5813 if (domain == 0 && !f.allow_unqualified_recipient)
5816 errmess = US"unqualified recipient address not allowed";
5820 if (error_handling == ERRORS_STDERR)
5822 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5823 string_printing(list[i]), errmess);
5824 exim_exit(EXIT_FAILURE);
5830 eblock.text1 = string_printing(list[i]);
5831 eblock.text2 = errmess;
5833 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5834 errors_sender_rc : EXIT_FAILURE;
5837 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5840 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5844 /* Show the recipients when debugging */
5848 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5849 if (recipients_list)
5851 debug_printf("Recipients:\n");
5852 for (int i = 0; i < recipients_count; i++)
5853 debug_printf(" %s\n", recipients_list[i].address);
5857 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5858 ignored; rejecting here would just add complication, and it can just as
5859 well be done later. Allow $recipients to be visible in the ACL. */
5861 if (acl_not_smtp_start)
5863 uschar *user_msg, *log_msg;
5864 f.enable_dollar_recipients = TRUE;
5865 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5866 &user_msg, &log_msg);
5867 f.enable_dollar_recipients = FALSE;
5870 /* Pause for a while waiting for input. If none received in that time,
5871 close the logfile, if we had one open; then if we wait for a long-running
5872 datasource (months, in one use-case) log rotation will not leave us holding
5875 if (!receive_timeout)
5876 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5879 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5880 will just read the headers for the message, and not write anything onto the
5883 message_ended = END_NOTENDED;
5884 more = receive_msg(extract_recipients);
5886 /* more is always FALSE here (not SMTP message) when reading a message
5887 for real; when reading the headers of a message for filter testing,
5888 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5890 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5891 } /* Non-SMTP message reception */
5893 /* If this is a filter testing run, there are headers in store, but
5894 no message on the spool. Run the filtering code in testing mode, setting
5895 the domain to the qualify domain and the local part to the current user,
5896 unless they have been set by options. The prefix and suffix are left unset
5897 unless specified. The the return path is set to to the sender unless it has
5898 already been set from a return-path header in the message. */
5900 if (filter_test != FTEST_NONE)
5902 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5903 deliver_domain_orig = deliver_domain;
5904 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5905 deliver_localpart_orig = deliver_localpart;
5906 deliver_localpart_prefix = US ftest_prefix;
5907 deliver_localpart_suffix = US ftest_suffix;
5908 deliver_home = originator_home;
5912 printf("Return-path copied from sender\n");
5913 return_path = string_copy(sender_address);
5916 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5917 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5919 receive_add_recipient(
5920 string_sprintf("%s%s%s@%s",
5921 ftest_prefix ? ftest_prefix : US"",
5923 ftest_suffix ? ftest_suffix : US"",
5924 deliver_domain), -1);
5926 printf("Recipient = %s\n", recipients_list[0].address);
5927 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5928 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5930 if (chdir("/")) /* Get away from wherever the user is running this from */
5932 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5933 exim_exit(EXIT_FAILURE);
5936 /* Now we run either a system filter test, or a user filter test, or both.
5937 In the latter case, headers added by the system filter will persist and be
5938 available to the user filter. We need to copy the filter variables
5941 if (filter_test & FTEST_SYSTEM)
5942 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5943 exim_exit(EXIT_FAILURE);
5945 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5947 if (filter_test & FTEST_USER)
5948 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5949 exim_exit(EXIT_FAILURE);
5951 exim_exit(EXIT_SUCCESS);
5954 /* Else act on the result of message reception. We should not get here unless
5955 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5956 will be TRUE. If it is not, check on the number of messages received in this
5959 if ( !session_local_queue_only
5960 && smtp_accept_queue_per_connection > 0
5961 && receive_messagecount > smtp_accept_queue_per_connection)
5963 session_local_queue_only = TRUE;
5964 queue_only_reason = 2;
5967 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5968 and queue_only_load is set, check that the load average is below it. If it is
5969 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5970 default), we put the whole session into queue_only mode. It then remains this
5971 way for any subsequent messages on the same SMTP connection. This is a
5972 deliberate choice; even though the load average may fall, it doesn't seem
5973 right to deliver later messages on the same call when not delivering earlier
5974 ones. However, there are odd cases where this is not wanted, so this can be
5975 changed by setting queue_only_load_latch false. */
5977 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5978 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5980 queue_only_reason = 3;
5981 if (queue_only_load_latch) session_local_queue_only = TRUE;
5984 /* If running as an MUA wrapper, all queueing options and freezing options
5988 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5990 /* Log the queueing here, when it will get a message id attached, but
5991 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5994 if (local_queue_only)
5996 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5997 switch(queue_only_reason)
6000 log_write(L_delay_delivery,
6001 LOG_MAIN, "no immediate delivery: more than %d messages "
6002 "received in one connection", smtp_accept_queue_per_connection);
6006 log_write(L_delay_delivery,
6007 LOG_MAIN, "no immediate delivery: load average %.2f",
6008 (double)load_average/1000.0);
6013 else if (f.queue_only_policy || f.deliver_freeze)
6014 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6016 /* Else do the delivery unless the ACL or local_scan() called for queue only
6017 or froze the message. Always deliver in a separate process. A fork failure is
6018 not a disaster, as the delivery will eventually happen on a subsequent queue
6019 run. The search cache must be tidied before the fork, as the parent will
6020 do it before exiting. The child will trigger a lookup failure and
6021 thereby defer the delivery if it tries to use (for example) a cached ldap
6022 connection that the parent has called unbind on. */
6029 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6032 close_unwanted(); /* Close unwanted file descriptors and TLS */
6033 exim_nullstd(); /* Ensure std{in,out,err} exist */
6035 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6036 mode, deliver_drop_privilege is forced TRUE). */
6038 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6040 delivery_re_exec(CEE_EXEC_EXIT);
6041 /* Control does not return here. */
6044 /* No need to re-exec */
6046 rc = deliver_message(message_id, FALSE, FALSE);
6048 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6049 ? EXIT_SUCCESS : EXIT_FAILURE);
6054 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6055 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6056 "process: %s", strerror(errno));
6060 release_cutthrough_connection(US"msg passed for delivery");
6062 /* In the parent, wait if synchronous delivery is required. This will
6063 always be the case in MUA wrapper mode. */
6065 if (f.synchronous_delivery)
6068 while (wait(&status) != pid);
6069 if ((status & 0x00ff) != 0)
6070 log_write(0, LOG_MAIN|LOG_PANIC,
6071 "process %d crashed with signal %d while delivering %s",
6072 (int)pid, status & 0x00ff, message_id);
6073 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6078 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6079 automatically reaps children (see comments above the loop), clear away any
6080 finished subprocesses here, in case there are lots of messages coming in
6081 from the same source. */
6083 #ifndef SIG_IGN_WORKS
6084 while (waitpid(-1, NULL, WNOHANG) > 0);
6088 return_path = sender_address = NULL;
6089 authenticated_sender = NULL;
6090 deliver_localpart_orig = NULL;
6091 deliver_domain_orig = NULL;
6092 deliver_host = deliver_host_address = NULL;
6093 dnslist_domain = dnslist_matched = NULL;
6094 #ifdef WITH_CONTENT_SCAN
6095 malware_name = NULL;
6098 callout_address = NULL;
6099 sending_ip_address = NULL;
6100 deliver_localpart_data = deliver_domain_data =
6101 recipient_data = sender_data = NULL;
6104 store_reset(reset_point);
6107 exim_exit(EXIT_SUCCESS); /* Never returns */
6108 return 0; /* To stop compiler warning */