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 = QL_BASIC;
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')
2391 list_queue_option = QL_UNSORTED, argrest++;
2393 list_queue_option = QL_BASIC;
2397 /* -bp: List the contents of the mail queue, top-level only */
2401 /* -bpu: List the contents of the mail queue, top-level undelivered */
2403 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2405 /* -bpa: List the contents of the mail queue, including all delivered */
2407 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2409 /* -bpi: List only message IDs */
2411 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2413 /* Unknown after -bp[r] */
2419 /* -bP: List the configuration variables given as the address list.
2420 Force -v, so configuration errors get displayed. */
2423 /* -bP config: we need to setup here, because later,
2424 when list_options is checked, the config is read already */
2427 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2430 readconf_save_config(version_string);
2434 list_options = TRUE;
2435 debug_selector |= D_v;
2436 debug_file = stderr;
2440 /* -brt: Test retry configuration lookup */
2442 if (Ustrcmp(argrest, "t") == 0)
2445 test_retry_arg = i + 1;
2449 /* -brw: Test rewrite configuration */
2451 else if (Ustrcmp(argrest, "w") == 0)
2454 test_rewrite_arg = i + 1;
2460 /* -bS: Read SMTP commands on standard input, but produce no replies -
2461 all errors are reported by sending messages. */
2464 smtp_input = smtp_batched_input = receiving_message = TRUE;
2468 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2469 on standard output. */
2471 if (!*argrest) smtp_input = receiving_message = TRUE;
2475 /* -bt: address testing mode */
2478 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2482 /* -bv: verify addresses */
2485 verify_address_mode = checking = f.log_testing_mode = TRUE;
2487 /* -bvs: verify sender addresses */
2489 else if (Ustrcmp(argrest, "s") == 0)
2491 verify_address_mode = checking = f.log_testing_mode = TRUE;
2492 verify_as_sender = TRUE;
2497 /* -bV: Print version string and support details */
2501 printf("Exim version %s #%s built %s\n", version_string,
2502 version_cnumber, version_date);
2503 printf("%s\n", CS version_copyright);
2504 version_printed = TRUE;
2505 show_whats_supported(TRUE);
2506 f.log_testing_mode = TRUE;
2511 /* -bw: inetd wait mode, accept a listening socket as stdin */
2513 f.inetd_wait_mode = TRUE;
2514 f.background_daemon = FALSE;
2515 f.daemon_listen = f.daemon_scion = TRUE;
2517 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2518 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2529 /* -C: change configuration file list; ignore if it isn't really
2530 a change! Enforce a prefix check if required. */
2534 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2535 if (Ustrcmp(config_main_filelist, argrest) != 0)
2537 #ifdef ALT_CONFIG_PREFIX
2539 int len = Ustrlen(ALT_CONFIG_PREFIX);
2540 const uschar *list = argrest;
2542 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2543 while((filename = string_nextinlist(&list, &sep, big_buffer,
2545 if ( ( Ustrlen(filename) < len
2546 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2547 || Ustrstr(filename, "/../") != NULL
2549 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2551 exim_fail("-C Permission denied\n");
2553 if (real_uid != root_uid)
2555 #ifdef TRUSTED_CONFIG_LIST
2557 if (real_uid != exim_uid
2558 #ifdef CONFIGURE_OWNER
2559 && real_uid != config_uid
2562 f.trusted_config = FALSE;
2565 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2568 struct stat statbuf;
2570 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2571 (statbuf.st_uid != root_uid /* owner not root */
2572 #ifdef CONFIGURE_OWNER
2573 && statbuf.st_uid != config_uid /* owner not the special one */
2576 (statbuf.st_gid != root_gid /* group not root */
2577 #ifdef CONFIGURE_GROUP
2578 && statbuf.st_gid != config_gid /* group not the special one */
2580 && (statbuf.st_mode & 020) != 0 /* group writeable */
2582 (statbuf.st_mode & 2) != 0) /* world writeable */
2584 f.trusted_config = FALSE;
2589 /* Well, the trust list at least is up to scratch... */
2591 uschar *trusted_configs[32];
2594 int old_pool = store_pool;
2595 store_pool = POOL_MAIN;
2597 reset_point = store_mark();
2598 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2600 uschar *start = big_buffer, *nl;
2601 while (*start && isspace(*start))
2605 nl = Ustrchr(start, '\n');
2608 trusted_configs[nr_configs++] = string_copy(start);
2609 if (nr_configs == nelem(trusted_configs))
2617 const uschar *list = argrest;
2619 while (f.trusted_config && (filename = string_nextinlist(&list,
2620 &sep, big_buffer, big_buffer_size)))
2622 for (i=0; i < nr_configs; i++)
2623 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2625 if (i == nr_configs)
2627 f.trusted_config = FALSE;
2632 else /* No valid prefixes found in trust_list file. */
2633 f.trusted_config = FALSE;
2634 store_reset(reset_point);
2635 store_pool = old_pool;
2638 else /* Could not open trust_list file. */
2639 f.trusted_config = FALSE;
2642 /* Not root; don't trust config */
2643 f.trusted_config = FALSE;
2647 config_main_filelist = argrest;
2648 f.config_changed = TRUE;
2653 /* -D: set up a macro definition */
2656 #ifdef DISABLE_D_OPTION
2657 exim_fail("exim: -D is not available in this Exim binary\n");
2663 uschar *s = argrest;
2666 while (isspace(*s)) s++;
2668 if (*s < 'A' || *s > 'Z')
2669 exim_fail("exim: macro name set by -D must start with "
2670 "an upper case letter\n");
2672 while (isalnum(*s) || *s == '_')
2674 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2678 if (ptr == 0) { badarg = TRUE; break; }
2679 while (isspace(*s)) s++;
2682 if (*s++ != '=') { badarg = TRUE; break; }
2683 while (isspace(*s)) s++;
2686 for (m = macros_user; m; m = m->next)
2687 if (Ustrcmp(m->name, name) == 0)
2688 exim_fail("exim: duplicated -D in command line\n");
2690 m = macro_create(name, s, TRUE);
2692 if (clmacro_count >= MAX_CLMACROS)
2693 exim_fail("exim: too many -D options on command line\n");
2694 clmacros[clmacro_count++] =
2695 string_sprintf("-D%s=%s", m->name, m->replacement);
2702 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2704 if (Ustrcmp(argrest, "ropcr") == 0)
2706 /* drop_cr = TRUE; */
2709 /* -dp: Set up a debug pretrigger buffer with given size. */
2711 else if (Ustrcmp(argrest, "p") == 0)
2715 debug_pretrigger_setup(argv[i]);
2717 /* -dt: Set a debug trigger selector */
2719 else if (Ustrncmp(argrest, "t=", 2) == 0)
2720 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2722 /* -d: Set debug level (see also -v below).
2723 If -dd is used, debugging subprocesses of the daemon is disabled. */
2727 /* Use an intermediate variable so that we don't set debugging while
2728 decoding the debugging bits. */
2730 unsigned int selector = D_default;
2733 if (*argrest == 'd')
2735 f.debug_daemon = TRUE;
2739 decode_bits(&selector, 1, debug_notall, argrest,
2740 debug_options, debug_options_count, US"debug", 0);
2741 debug_selector = selector;
2746 /* -E: This is a local error message. This option is not intended for
2747 external use at all, but is not restricted to trusted callers because it
2748 does no harm (just suppresses certain error messages) and if Exim is run
2749 not setuid root it won't always be trusted when it generates error
2750 messages using this option. If there is a message id following -E, point
2751 message_reference at it, for logging. */
2754 f.local_error_message = TRUE;
2755 if (mac_ismsgid(argrest)) message_reference = argrest;
2759 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2760 option, so it looks as if historically the -oex options are also callable
2761 without the leading -o. So we have to accept them. Before the switch,
2762 anything starting -oe has been converted to -e. Exim does not support all
2763 of the sendmail error options. */
2766 if (Ustrcmp(argrest, "e") == 0)
2768 arg_error_handling = ERRORS_SENDER;
2769 errors_sender_rc = EXIT_SUCCESS;
2771 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2772 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2773 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2774 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2779 /* -F: Set sender's full name, used instead of the gecos entry from
2780 the password file. Since users can usually alter their gecos entries,
2781 there's no security involved in using this instead. The data can follow
2782 the -F or be in the next argument. */
2786 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2787 originator_name = string_copy_taint(
2788 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2790 f.sender_name_forced = TRUE;
2794 /* -f: Set sender's address - this value is only actually used if Exim is
2795 run by a trusted user, or if untrusted_set_sender is set and matches the
2796 address, except that the null address can always be set by any user. The
2797 test for this happens later, when the value given here is ignored when not
2798 permitted. For an untrusted user, the actual sender is still put in Sender:
2799 if it doesn't match the From: header (unless no_local_from_check is set).
2800 The data can follow the -f or be in the next argument. The -r switch is an
2801 obsolete form of -f but since there appear to be programs out there that
2802 use anything that sendmail has ever supported, better accept it - the
2803 synonymizing is done before the switch above.
2805 At this stage, we must allow domain literal addresses, because we don't
2806 know what the setting of allow_domain_literals is yet. Ditto for trailing
2807 dots and strip_trailing_dot. */
2811 int dummy_start, dummy_end;
2814 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2815 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2817 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2820 uschar * temp = argrest + Ustrlen(argrest) - 1;
2821 while (temp >= argrest && isspace(*temp)) temp--;
2822 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2823 allow_domain_literals = TRUE;
2824 strip_trailing_dot = TRUE;
2826 allow_utf8_domains = TRUE;
2828 if (!(sender_address = parse_extract_address(argrest, &errmess,
2829 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2830 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2832 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2834 message_smtputf8 = string_is_utf8(sender_address);
2835 allow_utf8_domains = FALSE;
2837 allow_domain_literals = FALSE;
2838 strip_trailing_dot = FALSE;
2840 f.sender_address_forced = TRUE;
2844 /* -G: sendmail invocation to specify that it's a gateway submission and
2845 sendmail may complain about problems instead of fixing them.
2846 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2847 not at this time complain about problems. */
2853 /* -h: Set the hop count for an incoming message. Exim does not currently
2854 support this; it always computes it by counting the Received: headers.
2855 To put it in will require a change to the spool header file format. */
2859 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2860 if (!isdigit(*argrest)) badarg = TRUE;
2864 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2865 not to be documented for sendmail but mailx (at least) uses it) */
2868 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2872 /* -L: set the identifier used for syslog; equivalent to setting
2873 syslog_processname in the config file, but needs to be an admin option. */
2877 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2878 if ((sz = Ustrlen(argrest)) > 32)
2879 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2881 exim_fail("exim: the -L syslog name is too short\n");
2882 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2886 receiving_message = FALSE;
2888 /* -MC: continue delivery of another message via an existing open
2889 file descriptor. This option is used for an internal call by the
2890 smtp transport when there is a pending message waiting to go to an
2891 address to which it has got a connection. Five subsequent arguments are
2892 required: transport name, host name, IP address, sequence number, and
2893 message_id. Transports may decline to create new processes if the sequence
2894 number gets too big. The channel is stdin. This (-MC) must be the last
2895 argument. There's a subsequent check that the real-uid is privileged.
2897 If we are running in the test harness. delay for a bit, to let the process
2898 that set this one up complete. This makes for repeatability of the logging,
2901 if (Ustrcmp(argrest, "C") == 0)
2903 union sockaddr_46 interface_sock;
2904 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2907 exim_fail("exim: too many or too few arguments after -MC\n");
2909 if (msg_action_arg >= 0)
2910 exim_fail("exim: incompatible arguments\n");
2912 continue_transport = string_copy_taint(
2913 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2915 continue_hostname = string_copy_taint(
2916 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2918 continue_host_address = string_copy_taint(
2919 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2921 continue_sequence = Uatoi(argv[++i]);
2922 msg_action = MSG_DELIVER;
2923 msg_action_arg = ++i;
2924 forced_delivery = TRUE;
2925 queue_run_pid = passed_qr_pid;
2926 queue_run_pipe = passed_qr_pipe;
2928 if (!mac_ismsgid(argv[i]))
2929 exim_fail("exim: malformed message id %s after -MC option\n",
2932 /* Set up $sending_ip_address and $sending_port, unless proxied */
2934 if (!continue_proxy_cipher)
2935 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2937 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2940 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2943 testharness_pause_ms(500);
2947 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2951 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2952 precedes -MC (see above). The flag indicates that the host to which
2953 Exim is connected has accepted an AUTH sequence. */
2955 case 'A': f.smtp_authenticated = TRUE; break;
2957 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2958 that exim is connected to supports the esmtp extension DSN */
2960 case 'D': smtp_peer_options |= OPTION_DSN; break;
2962 /* -MCd: for debug, set a process-purpose string */
2964 case 'd': if (++i < argc)
2965 process_purpose = string_copy_taint(
2966 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2971 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2972 from the commandline should be tainted - but we will need an untainted
2973 value for the spoolfile when doing a -odi delivery process. */
2975 case 'G': if (++i < argc) queue_name = string_copy_taint(
2976 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2981 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2983 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2985 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2986 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2987 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2989 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2991 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2996 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2997 it preceded -MC (see above) */
2999 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3001 #ifdef SUPPORT_SOCKS
3002 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3003 case 'p': proxy_session = TRUE;
3006 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3009 proxy_local_port = Uatoi(argv[i]);
3012 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3015 proxy_external_port = Uatoi(argv[i]);
3021 /* -MCQ: pass on the pid of the queue-running process that started
3022 this chain of deliveries and the fd of its synchronizing pipe; this
3023 is useful only when it precedes -MC (see above) */
3025 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3027 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3031 /* -MCq: do a quota check on the given recipient for the given size
3032 of message. Separate from -MC. */
3033 case 'q': rcpt_verify_quota = TRUE;
3034 if (++i < argc) message_size = Uatoi(argv[i]);
3038 /* -MCS: set the smtp_use_size flag; this is useful only when it
3039 precedes -MC (see above) */
3041 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3044 /* -MCs: used with -MCt; SNI was sent */
3045 /* -MCr: ditto, DANE */
3048 case 's': if (++i < argc)
3050 continue_proxy_sni = string_copy_taint(
3051 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3053 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3058 /* -MCt: similar to -MCT below but the connection is still open
3059 via a proxy process which handles the TLS context and coding.
3060 Require three arguments for the proxied local address and port,
3061 and the TLS cipher. */
3063 case 't': if (++i < argc)
3064 sending_ip_address = string_copy_taint(
3065 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3069 sending_port = (int)(Uatol(argv[i]));
3072 continue_proxy_cipher = string_copy_taint(
3073 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3078 /* -MCT: set the tls_offered flag; this is useful only when it
3079 precedes -MC (see above). The flag indicates that the host to which
3080 Exim is connected has offered TLS support. */
3082 case 'T': smtp_peer_options |= OPTION_TLS; break;
3085 default: badarg = TRUE; break;
3090 /* -M[x]: various operations on the following list of message ids:
3091 -M deliver the messages, ignoring next retry times and thawing
3092 -Mc deliver the messages, checking next retry times, no thawing
3093 -Mf freeze the messages
3094 -Mg give up on the messages
3095 -Mt thaw the messages
3096 -Mrm remove the messages
3097 In the above cases, this must be the last option. There are also the
3098 following options which are followed by a single message id, and which
3099 act on that message. Some of them use the "recipient" addresses as well.
3100 -Mar add recipient(s)
3101 -MG move to a different queue
3102 -Mmad mark all recipients delivered
3103 -Mmd mark recipients(s) delivered
3105 -Mset load a message for use with -be
3107 -Mvc show copy (of whole message, in RFC 2822 format)
3114 msg_action = MSG_DELIVER;
3115 forced_delivery = f.deliver_force_thaw = TRUE;
3117 else if (Ustrcmp(argrest, "ar") == 0)
3119 msg_action = MSG_ADD_RECIPIENT;
3120 one_msg_action = TRUE;
3122 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3123 else if (Ustrcmp(argrest, "es") == 0)
3125 msg_action = MSG_EDIT_SENDER;
3126 one_msg_action = TRUE;
3128 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3129 else if (Ustrcmp(argrest, "g") == 0)
3131 msg_action = MSG_DELIVER;
3132 deliver_give_up = TRUE;
3134 else if (Ustrcmp(argrest, "G") == 0)
3136 msg_action = MSG_SETQUEUE;
3137 queue_name_dest = string_copy_taint(
3138 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3141 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3142 else if (Ustrcmp(argrest, "md") == 0)
3144 msg_action = MSG_MARK_DELIVERED;
3145 one_msg_action = TRUE;
3147 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3148 else if (Ustrcmp(argrest, "set") == 0)
3150 msg_action = MSG_LOAD;
3151 one_msg_action = TRUE;
3153 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3154 else if (Ustrcmp(argrest, "vb") == 0)
3156 msg_action = MSG_SHOW_BODY;
3157 one_msg_action = TRUE;
3159 else if (Ustrcmp(argrest, "vc") == 0)
3161 msg_action = MSG_SHOW_COPY;
3162 one_msg_action = TRUE;
3164 else if (Ustrcmp(argrest, "vh") == 0)
3166 msg_action = MSG_SHOW_HEADER;
3167 one_msg_action = TRUE;
3169 else if (Ustrcmp(argrest, "vl") == 0)
3171 msg_action = MSG_SHOW_LOG;
3172 one_msg_action = TRUE;
3174 else { badarg = TRUE; break; }
3176 /* All the -Mxx options require at least one message id. */
3178 msg_action_arg = i + 1;
3179 if (msg_action_arg >= argc)
3180 exim_fail("exim: no message ids given after %s option\n", arg);
3182 /* Some require only message ids to follow */
3184 if (!one_msg_action)
3186 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3187 exim_fail("exim: malformed message id %s after %s option\n",
3189 goto END_ARG; /* Remaining args are ids */
3192 /* Others require only one message id, possibly followed by addresses,
3193 which will be handled as normal arguments. */
3197 if (!mac_ismsgid(argv[msg_action_arg]))
3198 exim_fail("exim: malformed message id %s after %s option\n",
3199 argv[msg_action_arg], arg);
3205 /* Some programs seem to call the -om option without the leading o;
3206 for sendmail it askes for "me too". Exim always does this. */
3209 if (*argrest) badarg = TRUE;
3213 /* -N: don't do delivery - a debugging option that stops transports doing
3214 their thing. It implies debugging at the D_v level. */
3219 f.dont_deliver = TRUE;
3220 debug_selector |= D_v;
3221 debug_file = stderr;
3227 /* -n: This means "don't alias" in sendmail, apparently.
3228 For normal invocations, it has no effect.
3229 It may affect some other options. */
3235 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3236 option to the specified value. This form uses long names. We need to handle
3237 -O option=value and -Ooption=value. */
3242 exim_fail("exim: string expected after -O\n");
3248 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3251 if (!*(alias_arg = argrest))
3252 if (i+1 < argc) alias_arg = argv[++i];
3253 else exim_fail("exim: string expected after -oA\n");
3256 /* -oB: Set a connection message max value for remote deliveries */
3259 uschar * p = argrest;
3261 if (i+1 < argc && isdigit((argv[i+1][0])))
3265 connection_max_messages = 1;
3272 exim_fail("exim: number expected after -oB\n");
3273 connection_max_messages = Uatoi(p);
3278 /* -odb: background delivery */
3281 if (Ustrcmp(argrest, "b") == 0)
3283 f.synchronous_delivery = FALSE;
3284 arg_queue_only = FALSE;
3285 queue_only_set = TRUE;
3288 /* -odd: testsuite-only: add no inter-process delays */
3290 else if (Ustrcmp(argrest, "d") == 0)
3291 f.testsuite_delays = FALSE;
3293 /* -odf: foreground delivery (smail-compatible option); same effect as
3294 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3297 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3299 f.synchronous_delivery = TRUE;
3300 arg_queue_only = FALSE;
3301 queue_only_set = TRUE;
3304 /* -odq: queue only */
3306 else if (Ustrcmp(argrest, "q") == 0)
3308 f.synchronous_delivery = FALSE;
3309 arg_queue_only = TRUE;
3310 queue_only_set = TRUE;
3313 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3314 but no remote delivery */
3316 else if (Ustrcmp(argrest, "qs") == 0)
3318 f.queue_smtp = TRUE;
3319 arg_queue_only = FALSE;
3320 queue_only_set = TRUE;
3325 /* -oex: Sendmail error flags. As these are also accepted without the
3326 leading -o prefix, for compatibility with vacation and other callers,
3327 they are handled with -e above. */
3329 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3330 -oitrue: Another sendmail syntax for the same */
3333 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3338 /* -oM*: Set various characteristics for an incoming message; actually
3339 acted on for trusted callers only. */
3344 exim_fail("exim: data expected after -oM%s\n", argrest);
3346 /* -oMa: Set sender host address */
3348 if (Ustrcmp(argrest, "a") == 0)
3349 sender_host_address = string_copy_taint(
3350 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3353 /* -oMaa: Set authenticator name */
3355 else if (Ustrcmp(argrest, "aa") == 0)
3356 sender_host_authenticated = string_copy_taint(
3357 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3360 /* -oMas: setting authenticated sender */
3362 else if (Ustrcmp(argrest, "as") == 0)
3363 authenticated_sender = string_copy_taint(
3364 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3367 /* -oMai: setting authenticated id */
3369 else if (Ustrcmp(argrest, "ai") == 0)
3370 authenticated_id = string_copy_taint(
3371 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMai"),
3374 /* -oMi: Set incoming interface address */
3376 else if (Ustrcmp(argrest, "i") == 0)
3377 interface_address = string_copy_taint(
3378 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3381 /* -oMm: Message reference */
3383 else if (Ustrcmp(argrest, "m") == 0)
3385 if (!mac_ismsgid(argv[i+1]))
3386 exim_fail("-oMm must be a valid message ID\n");
3387 if (!f.trusted_config)
3388 exim_fail("-oMm must be called by a trusted user/config\n");
3389 message_reference = argv[++i];
3392 /* -oMr: Received protocol */
3394 else if (Ustrcmp(argrest, "r") == 0)
3396 if (received_protocol)
3397 exim_fail("received_protocol is set already\n");
3399 received_protocol = string_copy_taint(
3400 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3403 /* -oMs: Set sender host name */
3405 else if (Ustrcmp(argrest, "s") == 0)
3406 sender_host_name = string_copy_taint(
3407 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3410 /* -oMt: Set sender ident */
3412 else if (Ustrcmp(argrest, "t") == 0)
3414 sender_ident_set = TRUE;
3415 sender_ident = string_copy_taint(
3416 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3420 /* Else a bad argument */
3427 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3428 seem to call this as -m (undocumented), so that is also accepted (see
3430 /* -oo: An ancient flag for old-style addresses which still seems to
3431 crop up in some calls (see in SCO). */
3435 if (*argrest) badarg = TRUE;
3438 /* -oP <name>: set pid file path for daemon
3439 -oPX: delete pid file of daemon */
3442 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3443 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3444 "(uid=%d euid=%d | %d)\n",
3445 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3446 if (!*argrest) override_pid_file_path = argv[++i];
3447 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3452 /* -or <n>: set timeout for non-SMTP acceptance
3453 -os <n>: set timeout for SMTP acceptance */
3458 int * tp = argrest[-1] == 'r'
3459 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3461 *tp = readconf_readtime(argrest, 0, FALSE);
3462 else if (i+1 < argc)
3463 *tp = readconf_readtime(argv[++i], 0, FALSE);
3466 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3470 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3471 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3474 if (*argrest) badarg = TRUE;
3475 else override_local_interfaces = string_copy_taint(
3476 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3480 /* -oY: Override creation of daemon notifier socket */
3483 if (*argrest) badarg = TRUE;
3484 else f.notifier_socket_en = FALSE;
3487 /* Unknown -o argument */
3495 /* -ps: force Perl startup; -pd force delayed Perl startup */
3499 if (*argrest == 's' && argrest[1] == 0)
3501 perl_start_option = 1;
3504 if (*argrest == 'd' && argrest[1] == 0)
3506 perl_start_option = -1;
3511 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3512 which sets the host protocol and host name */
3515 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3519 uschar * hn = Ustrchr(argrest, ':');
3521 if (received_protocol)
3522 exim_fail("received_protocol is set already\n");
3525 received_protocol = string_copy_taint(
3526 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3530 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3531 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3532 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3537 /* -q: set up queue runs */
3541 BOOL two_stage, first_del, force, thaw = FALSE, local;
3543 receiving_message = FALSE;
3545 /* -qq...: Do queue runs in a 2-stage manner */
3547 if ((two_stage = *argrest == 'q'))
3550 /* -qi...: Do only first (initial) deliveries */
3552 if ((first_del = *argrest == 'i'))
3555 /* -qf...: Run the queue, forcing deliveries
3556 -qff..: Ditto, forcing thawing as well */
3558 if ((force = *argrest == 'f'))
3559 if ((thaw = *++argrest == 'f'))
3562 /* -q[f][f]l...: Run the queue only on local deliveries */
3564 if ((local = *argrest == 'l'))
3567 /* -q[f][f][l][G<name>]... Work on the named queue */
3569 if (*argrest == 'G')
3572 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3573 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3574 queue_name = string_copyn(argrest, i);
3576 if (*argrest == '/') argrest++;
3579 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3580 only, optionally named, optionally starting from a given message id. */
3582 if (!(list_queue || count_queue))
3587 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3589 q = alloc_onetime_qrunner();
3590 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3591 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3592 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3593 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3596 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3597 forced, optionally local only, optionally named. */
3601 int intvl = readconf_readtime(*argrest ? argrest : argv[++i], 0, FALSE);
3603 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3605 for (qrunner * qq = qrunners; qq; qq = qq->next)
3606 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3607 || !queue_name && !qq->name)
3608 exim_fail("exim: queue-runner specified more than once\n");
3610 q = alloc_qrunner();
3611 q->interval = intvl;
3614 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3615 q->queue_run_force = force;
3616 q->deliver_force_thaw = thaw;
3617 q->queue_run_first_delivery = first_del;
3618 q->queue_run_local = local;
3619 q->queue_2stage = two_stage;
3626 case 'R': /* Synonymous with -qR... */
3627 case 'S': /* Synonymous with -qS... */
3629 const uschar * tainted_selectstr;
3632 receiving_message = FALSE;
3634 /* -Rf: As -R (below) but force all deliveries,
3635 -Rff: Ditto, but also thaw all frozen messages,
3636 -Rr: String is regex
3637 -Rrf: Regex and force
3638 -Rrff: Regex and force and thaw
3640 -S...: Like -R but works on sender.
3642 in all cases provided there are no further characters in this
3645 alloc_onetime_qrunner();
3646 qrunners->queue_2stage = f.queue_2stage;
3648 for (int i = 0; i < nelem(rsopts); i++)
3649 if (Ustrcmp(argrest, rsopts[i]) == 0)
3651 if (i != 2) qrunners->queue_run_force = TRUE;
3653 if (switchchar == 'R')
3654 f.deliver_selectstring_regex = TRUE;
3656 f.deliver_selectstring_sender_regex = TRUE;
3657 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3658 argrest += Ustrlen(rsopts[i]);
3661 /* -R or -S: Set string to match in addresses for forced queue run to
3662 pick out particular messages. */
3664 /* Avoid attacks from people providing very long strings, and do so before
3667 tainted_selectstr = argrest;
3668 else if (i+1 < argc)
3669 tainted_selectstr = argv[++i];
3671 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3673 s = string_copy_taint(
3674 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3677 if (switchchar == 'R')
3678 deliver_selectstring = s;
3680 deliver_selectstring_sender = s;
3685 /* -r: an obsolete synonym for -f (see above) */
3687 /* -Tqt is an option that is exclusively for use by the testing suite.
3688 It is not recognized in other circumstances. It allows for the setting up
3689 of explicit "queue times" so that various warning/retry things can be
3690 tested. Otherwise variability of clock ticks etc. cause problems. */
3693 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3694 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3699 /* -t: Set flag to extract recipients from body of message. */
3702 if (!*argrest) extract_recipients = TRUE;
3704 /* -ti: Set flag to extract recipients from body of message, and also
3705 specify that dot does not end the message. */
3707 else if (Ustrcmp(argrest, "i") == 0)
3709 extract_recipients = TRUE;
3713 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3716 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3723 /* -U: This means "initial user submission" in sendmail, apparently. The
3724 doc claims that in future sendmail may refuse syntactically invalid
3725 messages instead of fixing them. For the moment, we just ignore it. */
3731 /* -v: verify things - this is a very low-level debugging */
3736 debug_selector |= D_v;
3737 debug_file = stderr;
3743 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3745 The -x flag tells the sendmail command that mail from a local
3746 mail program has National Language Support (NLS) extended characters
3747 in the body of the mail item. The sendmail command can send mail with
3748 extended NLS characters across networks that normally corrupts these
3751 As Exim is 8-bit clean, it just ignores this flag. */
3754 if (*argrest) badarg = TRUE;
3757 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3758 logs to that file. We swallow the parameter and otherwise ignore it. */
3763 exim_fail("exim: string expected after -X\n");
3766 /* -z: a line of text to log */
3771 log_oneline = string_copy_taint(
3772 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3775 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3778 /* All other initial characters are errors */
3783 } /* End of high-level switch statement */
3785 /* Failed to recognize the option, or syntax error */
3788 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3789 "option %s\n", arg);
3793 /* If -R or -S have been specified without -q, assume a single queue run. */
3795 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3796 alloc_onetime_qrunner();
3800 store_pool = old_pool;
3803 /* If usage_wanted is set we call the usage function - which never returns */
3804 if (usage_wanted) exim_usage(called_as);
3806 /* Arguments have been processed. Check for incompatibilities. */
3807 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3808 && ( f.daemon_listen || qrunners || bi_option
3809 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3810 || filter_test != FTEST_NONE
3811 || msg_action_arg > 0 && !one_msg_action
3813 || ( msg_action_arg > 0
3814 && ( f.daemon_listen || is_multiple_qrun() || list_options
3815 || checking && msg_action != MSG_LOAD
3816 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3818 || ( (f.daemon_listen || is_multiple_qrun())
3819 && ( sender_address || list_options || list_queue || checking
3822 || f.daemon_listen && is_onetime_qrun()
3823 || f.inetd_wait_mode && qrunners
3825 && ( checking || smtp_input || extract_recipients
3826 || filter_test != FTEST_NONE || bi_option
3828 || ( verify_address_mode
3829 && ( f.address_test_mode || smtp_input || extract_recipients
3830 || filter_test != FTEST_NONE || bi_option
3832 || ( f.address_test_mode
3833 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3837 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3839 || deliver_selectstring && !qrunners
3840 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3842 exim_fail("exim: incompatible command-line options or arguments\n");
3844 /* If debugging is set up, set the file and the file descriptor to pass on to
3845 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3846 to run in the foreground. */
3848 if (debug_selector != 0)
3850 debug_file = stderr;
3851 debug_fd = fileno(debug_file);
3852 f.background_daemon = FALSE;
3853 testharness_pause_ms(100); /* lets caller finish */
3854 if (debug_selector != D_v) /* -v only doesn't show this */
3856 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3857 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3859 if (!version_printed)
3860 show_whats_supported(FALSE);
3864 /* When started with root privilege, ensure that the limits on the number of
3865 open files and the number of processes (where that is accessible) are
3866 sufficiently large, or are unset, in case Exim has been called from an
3867 environment where the limits are screwed down. Not all OS have the ability to
3868 change some of these limits. */
3872 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3878 #ifdef RLIMIT_NOFILE
3879 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3881 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3883 rlp.rlim_cur = rlp.rlim_max = 0;
3886 /* I originally chose 1000 as a nice big number that was unlikely to
3887 be exceeded. It turns out that some older OS have a fixed upper limit of
3890 if (rlp.rlim_cur < 1000)
3892 rlp.rlim_cur = rlp.rlim_max = 1000;
3893 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3895 rlp.rlim_cur = rlp.rlim_max = 256;
3896 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3897 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3904 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3906 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3908 rlp.rlim_cur = rlp.rlim_max = 0;
3911 # ifdef RLIM_INFINITY
3912 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3914 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3916 if (rlp.rlim_cur < 1000)
3918 rlp.rlim_cur = rlp.rlim_max = 1000;
3920 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3921 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3927 /* Exim is normally entered as root (but some special configurations are
3928 possible that don't do this). However, it always spins off sub-processes that
3929 set their uid and gid as required for local delivery. We don't want to pass on
3930 any extra groups that root may belong to, so we want to get rid of them all at
3933 We need to obey setgroups() at this stage, before possibly giving up root
3934 privilege for a changed configuration file, but later on we might need to
3935 check on the additional groups for the admin user privilege - can't do that
3936 till after reading the config, which might specify the exim gid. Therefore,
3937 save the group list here first. */
3939 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3940 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3942 /* There is a fundamental difference in some BSD systems in the matter of
3943 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3944 known not to be different. On the "different" systems there is a single group
3945 list, and the first entry in it is the current group. On all other versions of
3946 Unix there is a supplementary group list, which is in *addition* to the current
3947 group. Consequently, to get rid of all extraneous groups on a "standard" system
3948 you pass over 0 groups to setgroups(), while on a "different" system you pass
3949 over a single group - the current group, which is always the first group in the
3950 list. Calling setgroups() with zero groups on a "different" system results in
3951 an error return. The following code should cope with both types of system.
3953 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3954 the "setgroups() with zero groups" - and changes the egid.
3955 Thanks to that we had to stash the original_egid above, for use below
3956 in the call to exim_setugid().
3958 However, if this process isn't running as root, setgroups() can't be used
3959 since you have to be root to run it, even if throwing away groups.
3960 Except, sigh, for Hurd - where you can.
3961 Not being root here happens only in some unusual configurations. */
3964 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3965 && setgroups(0, NULL) != 0
3967 && setgroups(1, group_list) != 0)
3968 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3970 /* If the configuration file name has been altered by an argument on the
3971 command line (either a new file name or a macro definition) and the caller is
3972 not root, or if this is a filter testing run, remove any setuid privilege the
3973 program has and run as the underlying user.
3975 The exim user is locked out of this, which severely restricts the use of -C
3978 Otherwise, set the real ids to the effective values (should be root unless run
3979 from inetd, which it can either be root or the exim uid, if one is configured).
3981 There is a private mechanism for bypassing some of this, in order to make it
3982 possible to test lots of configurations automatically, without having either to
3983 recompile each time, or to patch in an actual configuration file name and other
3984 values (such as the path name). If running in the test harness, pretend that
3985 configuration file changes and macro definitions haven't happened. */
3988 (!f.trusted_config || /* Config changed, or */
3989 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3990 real_uid != root_uid && /* Not root, and */
3991 !f.running_in_test_harness /* Not fudged */
3993 expansion_test /* expansion testing */
3995 filter_test != FTEST_NONE) /* Filter testing */
3997 setgroups(group_count, group_list);
3998 exim_setugid(real_uid, real_gid, FALSE,
3999 US"-C, -D, -be or -bf forces real uid");
4000 removed_privilege = TRUE;
4002 /* In the normal case when Exim is called like this, stderr is available
4003 and should be used for any logging information because attempts to write
4004 to the log will usually fail. To arrange this, we unset really_exim. However,
4005 if no stderr is available there is no point - we might as well have a go
4006 at the log (if it fails, syslog will be written).
4008 Note that if the invoker is Exim, the logs remain available. Messing with
4009 this causes unlogged successful deliveries. */
4011 if (log_stderr && real_uid != exim_uid)
4012 f.really_exim = FALSE;
4015 /* Privilege is to be retained for the moment. It may be dropped later,
4016 depending on the job that this Exim process has been asked to do. For now, set
4017 the real uid to the effective so that subsequent re-execs of Exim are done by a
4021 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4023 /* If testing a filter, open the file(s) now, before wasting time doing other
4024 setups and reading the message. */
4026 if (filter_test & FTEST_SYSTEM)
4027 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4028 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4031 if (filter_test & FTEST_USER)
4032 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4033 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4036 /* Initialise lookup_list
4037 If debugging, already called above via version reporting.
4038 In either case, we initialise the list of available lookups while running
4039 as root. All dynamically modules are loaded from a directory which is
4040 hard-coded into the binary and is code which, if not a module, would be
4041 part of Exim already. Ability to modify the content of the directory
4042 is equivalent to the ability to modify a setuid binary!
4044 This needs to happen before we read the main configuration. */
4047 /*XXX this excrescence could move to the testsuite standard config setup file */
4049 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4052 /* Read the main runtime configuration data; this gives up if there
4053 is a failure. It leaves the configuration file open so that the subsequent
4054 configuration data for delivery can be read if needed.
4056 NOTE: immediately after opening the configuration file we change the working
4057 directory to "/"! Later we change to $spool_directory. We do it there, because
4058 during readconf_main() some expansion takes place already. */
4060 /* Store the initial cwd before we change directories. Can be NULL if the
4061 dir has already been unlinked. */
4062 initial_cwd = os_getcwd(NULL, 0);
4063 if (!initial_cwd && errno)
4064 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4066 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4067 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4070 -be[m] expansion test -
4071 -b[fF] filter test new
4073 -bmalware malware_test_file new
4075 -brw rewrite test new
4077 -bv[s] address verify -
4079 -bP <option> (except -bP config, which sets list_config)
4081 If any of these options is set, we suppress warnings about configuration
4082 issues (currently about tls_advertise_hosts and keep_environment not being
4086 int old_pool = store_pool;
4087 #ifdef MEASURE_TIMING
4089 (void)gettimeofday(&t0, NULL);
4092 store_pool = POOL_CONFIG;
4093 readconf_main(checking || list_options);
4094 store_pool = old_pool;
4096 #ifdef MEASURE_TIMING
4097 report_time_since(&t0, US"readconf_main (delta)");
4101 /* Now in directory "/" */
4103 if (cleanup_environment() == FALSE)
4104 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4107 /* If an action on specific messages is requested, or if a daemon or queue
4108 runner is being started, we need to know if Exim was called by an admin user.
4109 This is the case if the real user is root or exim, or if the real group is
4110 exim, or if one of the supplementary groups is exim or a group listed in
4111 admin_groups. We don't fail all message actions immediately if not admin_user,
4112 since some actions can be performed by non-admin users. Instead, set admin_user
4113 for later interrogation. */
4115 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4116 f.admin_user = TRUE;
4118 for (int i = 0; i < group_count && !f.admin_user; i++)
4119 if (group_list[i] == exim_gid)
4120 f.admin_user = TRUE;
4121 else if (admin_groups)
4122 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4123 if (admin_groups[j] == group_list[i])
4124 f.admin_user = TRUE;
4126 /* Another group of privileged users are the trusted users. These are root,
4127 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4128 are permitted to specify sender_addresses with -f on the command line, and
4129 other message parameters as well. */
4131 if (real_uid == root_uid || real_uid == exim_uid)
4132 f.trusted_caller = TRUE;
4136 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4137 if (trusted_users[i] == real_uid)
4138 f.trusted_caller = TRUE;
4141 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4142 if (trusted_groups[i] == real_gid)
4143 f.trusted_caller = TRUE;
4144 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4145 if (trusted_groups[i] == group_list[j])
4146 f.trusted_caller = TRUE;
4149 /* At this point, we know if the user is privileged and some command-line
4150 options become possibly impermissible, depending upon the configuration file. */
4152 if (checking && commandline_checks_require_admin && !f.admin_user)
4153 exim_fail("exim: those command-line flags are set to require admin\n");
4155 /* Handle the decoding of logging options. */
4157 decode_bits(log_selector, log_selector_size, log_notall,
4158 log_selector_string, log_options, log_options_count, US"log", 0);
4162 debug_printf("configuration file is %s\n", config_main_filename);
4163 debug_printf("log selectors =");
4164 for (int i = 0; i < log_selector_size; i++)
4165 debug_printf(" %08x", log_selector[i]);
4169 /* If domain literals are not allowed, check the sender address that was
4170 supplied with -f. Ditto for a stripped trailing dot. */
4174 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4175 exim_fail("exim: bad -f address \"%s\": domain literals not "
4176 "allowed\n", sender_address);
4177 if (f_end_dot && !strip_trailing_dot)
4178 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4179 "(trailing dot not allowed)\n", sender_address);
4182 /* See if an admin user overrode our logging. */
4184 if (cmdline_syslog_name)
4187 syslog_processname = cmdline_syslog_name;
4188 log_file_path = string_copy(CUS"syslog");
4191 /* not a panic, non-privileged users should not be able to spam paniclog */
4193 "exim: you lack sufficient privilege to specify syslog process name\n");
4195 /* Paranoia check of maximum lengths of certain strings. There is a check
4196 on the length of the log file path in log.c, which will come into effect
4197 if there are any calls to write the log earlier than this. However, if we
4198 get this far but the string is very long, it is better to stop now than to
4199 carry on and (e.g.) receive a message and then have to collapse. The call to
4200 log_write() from here will cause the ultimate panic collapse if the complete
4201 file name exceeds the buffer length. */
4203 if (Ustrlen(log_file_path) > 200)
4204 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4205 "log_file_path is longer than 200 chars: aborting");
4207 if (Ustrlen(pid_file_path) > 200)
4208 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4209 "pid_file_path is longer than 200 chars: aborting");
4211 if (Ustrlen(spool_directory) > 200)
4212 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4213 "spool_directory is longer than 200 chars: aborting");
4215 /* Length check on the process name given to syslog for its TAG field,
4216 which is only permitted to be 32 characters or less. See RFC 3164. */
4218 if (Ustrlen(syslog_processname) > 32)
4219 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4220 "syslog_processname is longer than 32 chars: aborting");
4225 log_write(0, LOG_MAIN, "%s", log_oneline);
4226 return EXIT_SUCCESS;
4229 return EXIT_FAILURE;
4231 /* In some operating systems, the environment variable TMPDIR controls where
4232 temporary files are created; Exim doesn't use these (apart from when delivering
4233 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4234 If TMPDIR is found in the environment, reset it to the value defined in the
4235 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4236 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4237 EXIM_TMPDIR by the build scripts.
4241 if (environ) for (uschar ** p = USS environ; *p; p++)
4242 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4244 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4245 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4247 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4251 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4252 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4253 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4254 called by a user who has set the TZ variable. This then affects the timestamps
4255 in log files and in Received: headers, and any created Date: header lines. The
4256 required timezone is settable in the configuration file, so nothing can be done
4257 about this earlier - but hopefully nothing will normally be logged earlier than
4258 this. We have to make a new environment if TZ is wrong, but don't bother if
4259 timestamps_utc is set, because then all times are in UTC anyway. */
4261 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4262 f.timestamps_utc = TRUE;
4265 uschar *envtz = US getenv("TZ");
4267 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4268 : timezone_string != NULL
4271 uschar **p = USS environ;
4275 if (environ) while (*p++) count++;
4276 if (!envtz) count++;
4277 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4278 if (environ) for (p = USS environ; *p; p++)
4279 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4280 if (timezone_string)
4282 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4283 sprintf(CS *newp++, "TZ=%s", timezone_string);
4288 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4289 tod_stamp(tod_log));
4293 /* Handle the case when we have removed the setuid privilege because of -C or
4294 -D. This means that the caller of Exim was not root.
4296 There is a problem if we were running as the Exim user. The sysadmin may
4297 expect this case to retain privilege because "the binary was called by the
4298 Exim user", but it hasn't, because either the -D option set macros, or the
4299 -C option set a non-trusted configuration file. There are two possibilities:
4301 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4302 to do message deliveries. Thus, the fact that it is running as a
4303 non-privileged user is plausible, and might be wanted in some special
4304 configurations. However, really_exim will have been set false when
4305 privilege was dropped, to stop Exim trying to write to its normal log
4306 files. Therefore, re-enable normal log processing, assuming the sysadmin
4307 has set up the log directory correctly.
4309 (2) If deliver_drop_privilege is not set, the configuration won't work as
4310 apparently intended, and so we log a panic message. In order to retain
4311 root for -C or -D, the caller must either be root or be invoking a
4312 trusted configuration file (when deliver_drop_privilege is false). */
4314 if ( removed_privilege
4315 && (!f.trusted_config || opt_D_used)
4316 && real_uid == exim_uid)
4317 if (deliver_drop_privilege)
4318 f.really_exim = TRUE; /* let logging work normally */
4320 log_write(0, LOG_MAIN|LOG_PANIC,
4321 "exim user lost privilege for using %s option",
4322 f.trusted_config? "-D" : "-C");
4324 /* Start up Perl interpreter if Perl support is configured and there is a
4325 perl_startup option, and the configuration or the command line specifies
4326 initializing starting. Note that the global variables are actually called
4327 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4330 if (perl_start_option != 0)
4331 opt_perl_at_start = (perl_start_option > 0);
4332 if (opt_perl_at_start && opt_perl_startup != NULL)
4335 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4336 if ((errstr = init_perl(opt_perl_startup)))
4337 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4338 opt_perl_started = TRUE;
4340 #endif /* EXIM_PERL */
4342 /* Log the arguments of the call if the configuration file said so. This is
4343 a debugging feature for finding out what arguments certain MUAs actually use.
4344 Don't attempt it if logging is disabled, or if listing variables or if
4345 verifying/testing addresses or expansions. */
4347 if ( (debug_selector & D_any || LOGGING(arguments))
4348 && f.really_exim && !list_options && !checking)
4350 uschar *p = big_buffer;
4351 Ustrcpy(p, US"cwd= (failed)");
4358 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4359 p += Ustrlen(CCS p);
4362 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4364 for (int i = 0; i < argc; i++)
4366 int len = Ustrlen(argv[i]);
4367 const uschar *printing;
4369 if (p + len + 8 >= big_buffer + big_buffer_size)
4371 Ustrcpy(p, US" ...");
4372 log_write(0, LOG_MAIN, "%s", big_buffer);
4373 Ustrcpy(big_buffer, US"...");
4376 printing = string_printing(argv[i]);
4377 if (!*printing) quote = US"\"";
4380 const uschar *pp = printing;
4382 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4384 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4385 (p - big_buffer) - 4), printing, quote);
4388 if (LOGGING(arguments))
4389 log_write(0, LOG_MAIN, "%s", big_buffer);
4391 debug_printf("%s\n", big_buffer);
4394 /* Set the working directory to be the top-level spool directory. We don't rely
4395 on this in the code, which always uses fully qualified names, but it's useful
4396 for core dumps etc. Don't complain if it fails - the spool directory might not
4397 be generally accessible and calls with the -C option (and others) have lost
4398 privilege by now. Before the chdir, we try to ensure that the directory exists.
4401 if (Uchdir(spool_directory) != 0)
4403 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4404 (void) Uchdir(spool_directory);
4407 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4408 alias file. Exim doesn't have such a concept, but this call is screwed into
4409 Sun's YP makefiles. Handle this by calling a configured script, as the real
4410 user who called Exim. The -oA option can be used to pass an argument to the
4415 (void) fclose(config_file);
4416 if (bi_command && *bi_command)
4420 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4421 if (alias_arg) argv[i++] = alias_arg;
4424 setgroups(group_count, group_list);
4425 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4427 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4428 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4430 execv(CS argv[0], (char *const *)argv);
4431 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4435 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4440 /* We moved the admin/trusted check to be immediately after reading the
4441 configuration file. We leave these prints here to ensure that syslog setup,
4442 logfile setup, and so on has already happened. */
4444 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4445 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4447 /* Only an admin user may start the daemon or force a queue run in the default
4448 configuration, but the queue run restriction can be relaxed. Only an admin
4449 user may request that a message be returned to its sender forthwith. Only an
4450 admin user may specify a debug level greater than D_v (because it might show
4451 passwords, etc. in lookup queries). Only an admin user may request a queue
4452 count. Only an admin user can use the test interface to scan for email
4453 (because Exim will be in the spool dir and able to look at mails). */
4457 BOOL debugset = (debug_selector & ~D_v) != 0;
4458 if ( deliver_give_up || f.daemon_listen || malware_test_file
4459 || count_queue && queue_list_requires_admin
4460 || list_queue && queue_list_requires_admin
4461 || qrunners && prod_requires_admin
4462 || queue_name_dest && prod_requires_admin
4463 || debugset && !f.running_in_test_harness
4465 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4468 /* If the real user is not root or the exim uid, the argument for passing
4469 in an open TCP/IP connection for another message is not permitted, nor is
4470 running with the -N option for any delivery action, unless this call to exim is
4471 one that supplied an input message, or we are using a patched exim for
4472 regression testing. */
4474 if ( real_uid != root_uid && real_uid != exim_uid
4475 && ( continue_hostname
4477 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4479 && !f.running_in_test_harness
4481 exim_fail("exim: Permission denied\n");
4483 /* If the caller is not trusted, certain arguments are ignored when running for
4484 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4485 Note that authority for performing certain actions on messages is tested in the
4486 queue_action() function. */
4488 if (!f.trusted_caller && !checking)
4490 sender_host_name = sender_host_address = interface_address =
4491 sender_ident = received_protocol = NULL;
4492 sender_host_port = interface_port = 0;
4493 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4496 /* If a sender host address is set, extract the optional port number off the
4497 end of it and check its syntax. Do the same thing for the interface address.
4498 Exim exits if the syntax is bad. */
4502 if (sender_host_address)
4503 sender_host_port = check_port(sender_host_address);
4504 if (interface_address)
4505 interface_port = check_port(interface_address);
4508 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4511 if (f.trusted_caller)
4513 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4514 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4517 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4520 /* If an SMTP message is being received check to see if the standard input is a
4521 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4522 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4527 union sockaddr_46 inetd_sock;
4528 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4529 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4531 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4532 if (family == AF_INET || family == AF_INET6)
4534 union sockaddr_46 interface_sock;
4535 size = sizeof(interface_sock);
4537 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4538 interface_address = host_ntoa(-1, &interface_sock, NULL,
4541 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4543 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4546 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4547 NULL, &sender_host_port);
4548 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4549 "inetd is not supported when mua_wrapper is set");
4553 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4558 /* If the load average is going to be needed while receiving a message, get it
4559 now for those OS that require the first call to os_getloadavg() to be done as
4560 root. There will be further calls later for each message received. */
4562 #ifdef LOAD_AVG_NEEDS_ROOT
4563 if ( receiving_message
4564 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4565 load_average = OS_GETLOADAVG();
4568 /* The queue_only configuration option can be overridden by -odx on the command
4569 line, except that if queue_only_override is false, queue_only cannot be unset
4570 from the command line. */
4572 if (queue_only_set && (queue_only_override || arg_queue_only))
4573 queue_only = arg_queue_only;
4575 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4578 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4579 if (arg_smtp_receive_timeout >= 0)
4580 smtp_receive_timeout = arg_smtp_receive_timeout;
4582 /* If Exim was started with root privilege, unless we have already removed the
4583 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4584 except when starting the daemon or doing some kind of delivery or address
4585 testing (-bt). These are the only cases when root need to be retained. We run
4586 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4587 retained only for starting the daemon. We always do the initgroups() in this
4588 situation (controlled by the TRUE below), in order to be as close as possible
4589 to the state Exim usually runs in. */
4591 if ( !unprivileged /* originally had root AND */
4592 && !removed_privilege /* still got root AND */
4593 && !f.daemon_listen /* not starting the daemon */
4594 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4595 && ( /* AND EITHER */
4596 deliver_drop_privilege /* requested unprivileged */
4598 !qrunners /* not running the queue */
4599 && ( msg_action_arg < 0 /* and */
4600 || msg_action != MSG_DELIVER /* not delivering */
4602 && (!checking || !f.address_test_mode) /* not address checking */
4603 && !rcpt_verify_quota /* and not quota checking */
4605 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4607 /* When we are retaining a privileged uid, we still change to the exim gid. */
4612 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4613 rv = setgid(exim_gid);
4614 /* Impact of failure is that some stuff might end up with an incorrect group.
4615 We track this for failures from root, since any attempt to change privilege
4616 by root should succeed and failures should be examined. For non-root,
4617 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4618 no need to complain then. */
4620 if (!(unprivileged || removed_privilege))
4621 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4624 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4625 (long int)exim_gid, strerror(errno));
4629 /* Handle a request to scan a file for malware */
4630 if (malware_test_file)
4632 #ifdef WITH_CONTENT_SCAN
4634 set_process_info("scanning file for malware");
4635 if ((result = malware_in_file(malware_test_file)) == FAIL)
4637 printf("No malware found.\n");
4642 printf("Malware lookup returned non-okay/fail: %d\n", result);
4646 printf("Malware found: %s\n", malware_name);
4648 printf("Malware scan detected malware of unknown name.\n");
4650 printf("Malware scanning not enabled at compile time.\n");
4655 /* Handle a request to list the delivery queue */
4659 set_process_info("listing the queue");
4660 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4664 /* Handle a request to count the delivery queue */
4668 set_process_info("counting the queue");
4669 fprintf(stdout, "%u\n", queue_count());
4673 /* Handle actions on specific messages, except for the force delivery and
4674 message load actions, which are done below. Some actions take a whole list of
4675 message ids, which are known to continue up to the end of the arguments. Others
4676 take a single message id and then operate on the recipients list. */
4678 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4680 int yield = EXIT_SUCCESS;
4681 set_process_info("acting on specified messages");
4683 /* ACL definitions may be needed when removing a message (-Mrm) because
4684 event_action gets expanded */
4686 if (msg_action == MSG_REMOVE)
4688 int old_pool = store_pool;
4689 store_pool = POOL_CONFIG;
4691 store_pool = old_pool;
4692 store_writeprotect(POOL_CONFIG);
4695 if (!one_msg_action)
4697 for (i = msg_action_arg; i < argc; i++)
4698 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4699 yield = EXIT_FAILURE;
4702 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4703 default: printf("\n"); break;
4707 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4708 recipients_arg)) yield = EXIT_FAILURE;
4712 /* We used to set up here to skip reading the ACL section, on
4713 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4714 Now, since the intro of the ${acl } expansion, ACL definitions may be
4715 needed in transports so we lost the optimisation. */
4718 int old_pool = store_pool;
4719 #ifdef MEASURE_TIMING
4721 (void)gettimeofday(&t0, NULL);
4724 store_pool = POOL_CONFIG;
4726 store_pool = old_pool;
4728 /* -be can add macro definitions, needing to link to the macro structure
4729 chain. Otherwise, make the memory used for config data readonly. */
4731 if (!expansion_test)
4732 store_writeprotect(POOL_CONFIG);
4734 #ifdef MEASURE_TIMING
4735 report_time_since(&t0, US"readconf_rest (delta)");
4739 /* Handle a request to check quota */
4740 if (rcpt_verify_quota)
4741 if (real_uid != root_uid && real_uid != exim_uid)
4742 exim_fail("exim: Permission denied\n");
4743 else if (recipients_arg >= argc)
4744 exim_fail("exim: missing recipient for quota check\n");
4747 verify_quota(argv[recipients_arg]);
4748 exim_exit(EXIT_SUCCESS);
4751 /* Handle the -brt option. This is for checking out retry configurations.
4752 The next three arguments are a domain name or a complete address, and
4753 optionally two error numbers. All it does is to call the function that
4754 scans the retry configuration data. */
4756 if (test_retry_arg >= 0)
4758 retry_config *yield;
4759 int basic_errno = 0;
4761 const uschar *s1, *s2;
4763 if (test_retry_arg >= argc)
4765 printf("-brt needs a domain or address argument\n");
4766 exim_exit(EXIT_FAILURE);
4768 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4771 /* If the first argument contains no @ and no . it might be a local user
4772 or it might be a single-component name. Treat as a domain. */
4774 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4776 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4777 "being \ntreated as a one-component domain, not as a local part.\n\n",
4781 /* There may be an optional second domain arg. */
4783 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4784 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4786 /* The final arg is an error name */
4788 if (test_retry_arg < argc)
4790 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4792 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4795 printf("%s\n", CS error);
4796 return EXIT_FAILURE;
4799 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4800 code > 100 as an error is for matching codes to the decade. Turn them into
4801 a real error code, off the decade. */
4803 if (basic_errno == ERRNO_MAIL4XX ||
4804 basic_errno == ERRNO_RCPT4XX ||
4805 basic_errno == ERRNO_DATA4XX)
4807 int code = (more_errno >> 8) & 255;
4809 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4810 else if (code > 100)
4811 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4815 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4816 printf("No retry information found\n");
4819 more_errno = yield->more_errno;
4820 printf("Retry rule: %s ", yield->pattern);
4822 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4824 printf("quota%s%s ",
4825 (more_errno > 0)? "_" : "",
4826 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4828 else if (yield->basic_errno == ECONNREFUSED)
4830 printf("refused%s%s ",
4831 (more_errno > 0)? "_" : "",
4832 (more_errno == 'M')? "MX" :
4833 (more_errno == 'A')? "A" : "");
4835 else if (yield->basic_errno == ETIMEDOUT)
4838 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4840 if (more_errno != 0) printf("_%s",
4841 (more_errno == 'M')? "MX" : "A");
4844 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4845 printf("auth_failed ");
4848 for (retry_rule * r = yield->rules; r; r = r->next)
4850 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4851 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4857 printf(",%d.", x/1000);
4871 exim_exit(EXIT_SUCCESS);
4874 /* Handle a request to list one or more configuration options */
4875 /* If -n was set, we suppress some information */
4880 set_process_info("listing variables");
4881 if (recipients_arg >= argc)
4882 fail = !readconf_print(US"all", NULL, flag_n);
4883 else for (i = recipients_arg; i < argc; i++)
4886 (Ustrcmp(argv[i], "router") == 0 ||
4887 Ustrcmp(argv[i], "transport") == 0 ||
4888 Ustrcmp(argv[i], "authenticator") == 0 ||
4889 Ustrcmp(argv[i], "macro") == 0 ||
4890 Ustrcmp(argv[i], "environment") == 0))
4892 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4896 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4898 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4903 set_process_info("listing config");
4904 exim_exit(readconf_print(US"config", NULL, flag_n)
4905 ? EXIT_SUCCESS : EXIT_FAILURE);
4909 /* Initialise subsystems as required. */
4913 /* Handle a request to deliver one or more messages that are already on the
4914 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4915 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4917 Delivery of specific messages is typically used for a small number when
4918 prodding by hand (when the option forced_delivery will be set) or when
4919 re-execing to regain root privilege. Each message delivery must happen in a
4920 separate process, so we fork a process for each one, and run them sequentially
4921 so that debugging output doesn't get intertwined, and to avoid spawning too
4922 many processes if a long list is given. However, don't fork for the last one;
4923 this saves a process in the common case when Exim is called to deliver just one
4926 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4928 if (prod_requires_admin && !f.admin_user)
4930 fprintf(stderr, "exim: Permission denied\n");
4931 exim_exit(EXIT_FAILURE);
4933 set_process_info("delivering specified messages");
4934 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4935 for (i = msg_action_arg; i < argc; i++)
4939 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4940 that runs into a later copy into the untainted global message_id[] */
4941 /*XXX Do we need a length limit check here? */
4943 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4944 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4946 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4947 exim_underbar_exit(EXIT_SUCCESS);
4951 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4953 exim_exit(EXIT_FAILURE);
4957 exim_exit(EXIT_SUCCESS);
4961 /* If only a single queue run is requested, without SMTP listening, we can just
4962 turn into a queue runner, with an optional starting message id. */
4964 if (is_onetime_qrun() && !f.daemon_listen)
4966 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
4967 exim_exit(EXIT_SUCCESS);
4971 /* Find the login name of the real user running this process. This is always
4972 needed when receiving a message, because it is written into the spool file. It
4973 may also be used to construct a from: or a sender: header, and in this case we
4974 need the user's full name as well, so save a copy of it, checked for RFC822
4975 syntax and munged if necessary, if it hasn't previously been set by the -F
4976 argument. We may try to get the passwd entry more than once, in case NIS or
4977 other delays are in evidence. Save the home directory for use in filter testing
4982 if ((pw = getpwuid(real_uid)) != NULL)
4984 originator_login = string_copy(US pw->pw_name);
4985 originator_home = string_copy(US pw->pw_dir);
4987 /* If user name has not been set by -F, set it from the passwd entry
4988 unless -f has been used to set the sender address by a trusted user. */
4990 if (!originator_name)
4992 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4994 uschar *name = US pw->pw_gecos;
4995 uschar *amp = Ustrchr(name, '&');
4998 /* Most Unix specify that a '&' character in the gecos field is
4999 replaced by a copy of the login name, and some even specify that
5000 the first character should be upper cased, so that's what we do. */
5005 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5006 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5007 buffer[loffset] = toupper(buffer[loffset]);
5011 /* If a pattern for matching the gecos field was supplied, apply
5012 it and then expand the name string. */
5014 if (gecos_pattern && gecos_name)
5016 const pcre2_code *re;
5017 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5019 if (regex_match_and_setup(re, name, 0, -1))
5021 uschar *new_name = expand_string(gecos_name);
5025 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5026 "gecos field \"%s\"\n", new_name, name);
5029 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5030 "\"%s\": %s\n", gecos_name, expand_string_message);
5032 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5033 "gecos field \"%s\"\n", gecos_pattern, name);
5034 store_free((void *)re);
5036 originator_name = string_copy(name);
5039 /* A trusted caller has used -f but not -F */
5041 else originator_name = US"";
5044 /* Break the retry loop */
5049 if (++i > finduser_retries) break;
5053 /* If we cannot get a user login, log the incident and give up, unless the
5054 configuration specifies something to use. When running in the test harness,
5055 any setting of unknown_login overrides the actual name. */
5057 if (!originator_login || f.running_in_test_harness)
5061 originator_login = expand_string(unknown_login);
5062 if (!originator_name && unknown_username)
5063 originator_name = expand_string(unknown_username);
5064 if (!originator_name) originator_name = US"";
5066 if (!originator_login)
5067 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5071 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5074 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5076 /* If a message is created by this call of Exim, the uid/gid of its originator
5077 are those of the caller. These values are overridden if an existing message is
5078 read in from the spool. */
5080 originator_uid = real_uid;
5081 originator_gid = real_gid;
5083 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5084 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5086 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5087 returns. We leave this till here so that the originator_ fields are available
5088 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5091 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5095 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5096 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5097 "mua_wrapper is set");
5100 # ifndef DISABLE_TLS
5101 /* This also checks that the library linkage is working and we can call
5102 routines in it, so call even if tls_require_ciphers is unset */
5104 # ifdef MEASURE_TIMING
5106 (void)gettimeofday(&t0, NULL);
5108 if (!tls_dropprivs_validate_require_cipher(FALSE))
5110 # ifdef MEASURE_TIMING
5111 report_time_since(&t0, US"validate_ciphers (delta)");
5119 /* If the sender ident has not been set (by a trusted caller) set it to
5120 the caller. This will get overwritten below for an inetd call. If a trusted
5121 caller has set it empty, unset it. */
5123 if (!sender_ident) sender_ident = originator_login;
5124 else if (!*sender_ident) sender_ident = NULL;
5126 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5127 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5128 originator_* variables set. */
5130 if (test_rewrite_arg >= 0)
5132 f.really_exim = FALSE;
5133 if (test_rewrite_arg >= argc)
5135 printf("-brw needs an address argument\n");
5136 exim_exit(EXIT_FAILURE);
5138 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5139 exim_exit(EXIT_SUCCESS);
5142 /* A locally-supplied message is considered to be coming from a local user
5143 unless a trusted caller supplies a sender address with -f, or is passing in the
5144 message via SMTP (inetd invocation or otherwise). */
5146 if ( !sender_address && !smtp_input
5147 || !f.trusted_caller && filter_test == FTEST_NONE)
5149 f.sender_local = TRUE;
5151 /* A trusted caller can supply authenticated_sender and authenticated_id
5152 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5153 defaults except when host checking. */
5155 if (!authenticated_sender && !host_checking)
5156 authenticated_sender = string_sprintf("%s@%s", originator_login,
5157 qualify_domain_sender);
5158 if (!authenticated_id && !host_checking)
5159 authenticated_id = originator_login;
5162 /* Trusted callers are always permitted to specify the sender address.
5163 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5164 is specified is the empty address. However, if a trusted caller does not
5165 specify a sender address for SMTP input, we leave sender_address unset. This
5166 causes the MAIL commands to be honoured. */
5168 if ( !smtp_input && !sender_address
5169 || !receive_check_set_sender(sender_address))
5171 /* Either the caller is not permitted to set a general sender, or this is
5172 non-SMTP input and the trusted caller has not set a sender. If there is no
5173 sender, or if a sender other than <> is set, override with the originator's
5174 login (which will get qualified below), except when checking things. */
5176 if ( !sender_address /* No sender_address set */
5178 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5179 !checking)) /* Not running tests, including filter tests */
5181 sender_address = originator_login;
5182 f.sender_address_forced = FALSE;
5183 sender_address_domain = 0;
5187 /* Remember whether an untrusted caller set the sender address */
5189 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5191 /* Ensure that the sender address is fully qualified unless it is the empty
5192 address, which indicates an error message, or doesn't exist (root caller, smtp
5193 interface, no -f argument). */
5195 if (sender_address && *sender_address && sender_address_domain == 0)
5196 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5197 qualify_domain_sender);
5199 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5201 /* Handle a request to verify a list of addresses, or test them for delivery.
5202 This must follow the setting of the sender address, since routers can be
5203 predicated upon the sender. If no arguments are given, read addresses from
5204 stdin. Set debug_level to at least D_v to get full output for address testing.
5207 if (verify_address_mode || f.address_test_mode)
5210 int flags = vopt_qualify;
5212 if (verify_address_mode)
5214 if (!verify_as_sender) flags |= vopt_is_recipient;
5215 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5220 flags |= vopt_is_recipient;
5221 debug_selector |= D_v;
5222 debug_file = stderr;
5223 debug_fd = fileno(debug_file);
5224 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5227 if (recipients_arg < argc)
5228 while (recipients_arg < argc)
5230 /* Supplied addresses are tainted since they come from a user */
5231 uschar * s = string_copy_taint(
5232 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5236 BOOL finished = FALSE;
5237 uschar *ss = parse_find_address_end(s, FALSE);
5238 if (*ss == ',') *ss = 0; else finished = TRUE;
5239 test_address(s, flags, &exit_value);
5242 while (*++s == ',' || isspace(*s)) ;
5248 uschar * s = get_stdinput(NULL, NULL);
5250 test_address(string_copy_taint(
5251 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5253 flags, &exit_value);
5257 exim_exit(exit_value);
5260 /* Handle expansion checking. Either expand items on the command line, or read
5261 from stdin if there aren't any. If -Mset was specified, load the message so
5262 that its variables can be used, but restrict this facility to admin users.
5263 Otherwise, if -bem was used, read a message from stdin. */
5267 dns_init(FALSE, FALSE, FALSE);
5268 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5272 exim_fail("exim: permission denied\n");
5273 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5274 /* Checking the length of the ID is sufficient to validate it.
5275 Get an untainted version so file opens can be done. */
5276 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5278 spoolname = string_sprintf("%s-H", message_id);
5279 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5280 printf ("Failed to load message datafile %s\n", message_id);
5281 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5282 printf ("Failed to load message %s\n", message_id);
5285 /* Read a test message from a file. We fudge it up to be on stdin, saving
5286 stdin itself for later reading of expansion strings. */
5288 else if (expansion_test_message)
5290 int save_stdin = dup(0);
5291 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5293 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5296 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5297 message_ended = END_NOTENDED;
5298 read_message_body(receive_msg(extract_recipients));
5299 message_linecount += body_linecount;
5300 (void)dup2(save_stdin, 0);
5301 (void)close(save_stdin);
5302 clearerr(stdin); /* Required by Darwin */
5305 /* Only admin users may see config-file macros this way */
5307 if (!f.admin_user) macros_user = macros = mlast = NULL;
5309 /* Allow $recipients for this testing */
5311 f.enable_dollar_recipients = TRUE;
5313 /* Expand command line items */
5315 if (recipients_arg < argc)
5316 while (recipients_arg < argc)
5317 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5323 char *(*fn_readline)(const char *) = NULL;
5324 void (*fn_addhist)(const char *) = NULL;
5328 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5331 while (s = get_stdinput(fn_readline, fn_addhist))
5332 expansion_test_line(s);
5335 if (dlhandle) dlclose(dlhandle);
5339 /* The data file will be open after -Mset */
5341 if (deliver_datafile >= 0)
5343 (void)close(deliver_datafile);
5344 deliver_datafile = -1;
5347 exim_exit(EXIT_SUCCESS);
5351 /* The active host name is normally the primary host name, but it can be varied
5352 for hosts that want to play several parts at once. We need to ensure that it is
5353 set for host checking, and for receiving messages. */
5355 smtp_active_hostname = primary_hostname;
5356 if (raw_active_hostname != NULL)
5358 uschar *nah = expand_string(raw_active_hostname);
5361 if (!f.expand_string_forcedfail)
5362 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5363 "(smtp_active_hostname): %s", raw_active_hostname,
5364 expand_string_message);
5366 else if (nah[0] != 0) smtp_active_hostname = nah;
5369 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5370 given IP address so that the blocking and relay configuration can be tested.
5371 Unless a sender_ident was set by -oMt, we discard it (the default is the
5372 caller's login name). An RFC 1413 call is made only if we are running in the
5373 test harness and an incoming interface and both ports are specified, because
5374 there is no TCP/IP call to find the ident for. */
5381 if (!sender_ident_set)
5383 sender_ident = NULL;
5384 if (f.running_in_test_harness && sender_host_port
5385 && interface_address && interface_port)
5386 verify_get_ident(1223); /* note hardwired port number */
5389 /* In case the given address is a non-canonical IPv6 address, canonicalize
5390 it. The code works for both IPv4 and IPv6, as it happens. */
5392 size = host_aton(sender_host_address, x);
5393 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5394 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5396 /* Now set up for testing */
5398 host_build_sender_fullhost();
5402 f.sender_local = FALSE;
5403 f.sender_host_notsocket = TRUE;
5404 debug_file = stderr;
5405 debug_fd = fileno(debug_file);
5406 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5407 "**** but without any ident (RFC 1413) callback.\n"
5408 "**** This is not for real!\n\n",
5409 sender_host_address);
5411 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5412 if (verify_check_host(&hosts_connection_nolog) == OK)
5414 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5415 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5417 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5419 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5420 because a log line has already been written for all its failure exists
5421 (usually "connection refused: <reason>") and writing another one is
5422 unnecessary clutter. */
5424 if (smtp_start_session())
5427 for (; (reset_point = store_mark()); store_reset(reset_point))
5429 if (smtp_setup_msg() <= 0) break;
5430 if (!receive_msg(FALSE)) break;
5432 return_path = sender_address = NULL;
5433 dnslist_domain = dnslist_matched = NULL;
5434 #ifndef DISABLE_DKIM
5435 dkim_cur_signer = NULL;
5438 deliver_localpart_orig = NULL;
5439 deliver_domain_orig = NULL;
5440 callout_address = sending_ip_address = NULL;
5441 deliver_localpart_data = deliver_domain_data =
5442 recipient_data = sender_data = NULL;
5443 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5447 exim_exit(EXIT_SUCCESS);
5451 /* Arrange for message reception if recipients or SMTP were specified;
5452 otherwise complain unless a version print (-bV) happened or this is a filter
5453 verification test or info dump.
5454 In the former case, show the configuration file name. */
5456 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5458 if (version_printed)
5460 if (Ustrchr(config_main_filelist, ':'))
5461 printf("Configuration file search path is %s\n", config_main_filelist);
5462 printf("Configuration file is %s\n", config_main_filename);
5463 return EXIT_SUCCESS;
5466 if (info_flag != CMDINFO_NONE)
5468 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5469 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5472 if (filter_test == FTEST_NONE)
5473 exim_usage(called_as);
5477 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5478 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5479 that we are not called from inetd, because that is rejected above. The
5480 following configuration settings are forced here:
5482 (1) Synchronous delivery (-odi)
5483 (2) Errors to stderr (-oep == -oeq)
5484 (3) No parallel remote delivery
5485 (4) Unprivileged delivery
5487 We don't force overall queueing options because there are several of them;
5488 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5489 to override any SMTP queueing. */
5493 f.synchronous_delivery = TRUE;
5494 arg_error_handling = ERRORS_STDERR;
5495 remote_max_parallel = 1;
5496 deliver_drop_privilege = TRUE;
5497 f.queue_smtp = FALSE;
5498 queue_smtp_domains = NULL;
5500 message_utf8_downconvert = -1; /* convert-if-needed */
5505 /* Prepare to accept one or more new messages on the standard input. When a
5506 message has been read, its id is returned in message_id[]. If doing immediate
5507 delivery, we fork a delivery process for each received message, except for the
5508 last one, where we can save a process switch.
5510 It is only in non-smtp mode that error_handling is allowed to be changed from
5511 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5512 sendmail error modes other than -oem ever actually used? Later: yes.) */
5514 if (!smtp_input) error_handling = arg_error_handling;
5516 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5517 logging being sent down the socket and make an identd call to get the
5520 else if (f.is_inetd)
5522 (void)fclose(stderr);
5523 exim_nullstd(); /* Re-open to /dev/null */
5524 verify_get_ident(IDENT_PORT);
5525 host_build_sender_fullhost();
5526 set_process_info("handling incoming connection from %s via inetd",
5530 /* If the sender host address has been set, build sender_fullhost if it hasn't
5531 already been done (which it will have been for inetd). This caters for the
5532 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5533 so that the test for IP options is skipped for -bs input. */
5535 if (sender_host_address && !sender_fullhost)
5537 host_build_sender_fullhost();
5538 set_process_info("handling incoming connection from %s via -oMa",
5540 f.sender_host_notsocket = TRUE;
5543 /* Otherwise, set the sender host as unknown except for inetd calls. This
5544 prevents host checking in the case of -bs not from inetd and also for -bS. */
5546 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5548 /* If stdout does not exist, then dup stdin to stdout. This can happen
5549 if exim is started from inetd. In this case fd 0 will be set to the socket,
5550 but fd 1 will not be set. This also happens for passed SMTP channels. */
5552 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5554 /* Set up the incoming protocol name and the state of the program. Root is
5555 allowed to force received protocol via the -oMr option above. If we have come
5556 via inetd, the process info has already been set up. We don't set
5557 received_protocol here for smtp input, as it varies according to
5558 batch/HELO/EHLO/AUTH/TLS. */
5562 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5563 smtp_batched_input? "batched " : "",
5564 sender_address ? sender_address : originator_login);
5568 int old_pool = store_pool;
5569 store_pool = POOL_PERM;
5570 if (!received_protocol)
5571 received_protocol = string_sprintf("local%s", called_as);
5572 store_pool = old_pool;
5573 set_process_info("accepting a local non-SMTP message from <%s>",
5577 /* Initialize the session_local_queue-only flag (this will be ignored if
5578 mua_wrapper is set) */
5581 session_local_queue_only = queue_only;
5583 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5584 the spool if so configured. On failure, we must not attempt to send an error
5585 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5586 error code is given.) */
5588 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5589 exim_fail("exim: insufficient disk space\n");
5591 /* If this is smtp input of any kind, real or batched, handle the start of the
5594 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5595 because a log line has already been written for all its failure exists
5596 (usually "connection refused: <reason>") and writing another one is
5597 unnecessary clutter. */
5603 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5604 if (verify_check_host(&hosts_connection_nolog) == OK)
5606 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5607 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5609 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5610 if (!smtp_start_session())
5613 exim_exit(EXIT_SUCCESS);
5617 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5618 (we handle buferring so as to have visibility of fill level). */
5622 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5623 if (expand_string_message)
5624 if (thismessage_size_limit == -1)
5625 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5626 "message_size_limit: %s", expand_string_message);
5628 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5629 "message_size_limit: %s", expand_string_message);
5631 setvbuf(stdin, NULL, _IONBF, 0);
5634 /* Loop for several messages when reading SMTP input. If we fork any child
5635 processes, we don't want to wait for them unless synchronous delivery is
5636 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5637 same as SIG_DFL, despite the fact that documentation often lists the default as
5638 "ignore". This is a confusing area. This is what I know:
5640 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5641 processes that complete simply to go away without ever becoming defunct. You
5642 can't then wait for them - but we don't want to wait for them in the
5643 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5644 happen for all OS (e.g. *BSD is different).
5646 But that's not the end of the story. Some (many? all?) systems have the
5647 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5648 has by default, so it seems that the difference is merely one of default
5649 (compare restarting vs non-restarting signals).
5651 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5652 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5653 of the loop below. Paranoia rules.
5655 February 2003: That's *still* not the end of the story. There are now versions
5656 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5657 process then calls waitpid(), a grumble is written to the system log, because
5658 this is logically inconsistent. In other words, it doesn't like the paranoia.
5659 As a consequence of this, the waitpid() below is now excluded if we are sure
5660 that SIG_IGN works. */
5662 if (!f.synchronous_delivery)
5665 struct sigaction act;
5666 act.sa_handler = SIG_IGN;
5667 sigemptyset(&(act.sa_mask));
5668 act.sa_flags = SA_NOCLDWAIT;
5669 sigaction(SIGCHLD, &act, NULL);
5671 signal(SIGCHLD, SIG_IGN);
5675 /* Save the current store pool point, for resetting at the start of
5676 each message, and save the real sender address, if any. */
5678 real_sender_address = sender_address;
5680 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5681 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5684 for (BOOL more = TRUE; more; )
5686 rmark reset_point = store_mark();
5689 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5690 input and build the recipients list, before calling receive_msg() to read the
5691 message proper. Whatever sender address is given in the SMTP transaction is
5692 often ignored for local senders - we use the actual sender, which is normally
5693 either the underlying user running this process or a -f argument provided by
5694 a trusted caller. It is saved in real_sender_address. The test for whether to
5695 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5700 if ((rc = smtp_setup_msg()) > 0)
5702 if (real_sender_address != NULL &&
5703 !receive_check_set_sender(sender_address))
5705 sender_address = raw_sender = real_sender_address;
5706 sender_address_unrewritten = NULL;
5709 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5710 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5711 the very end. The result of the ACL is ignored (as for other non-SMTP
5712 messages). It is run for its potential side effects. */
5714 if (smtp_batched_input && acl_not_smtp_start != NULL)
5716 uschar *user_msg, *log_msg;
5717 f.enable_dollar_recipients = TRUE;
5718 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5719 &user_msg, &log_msg);
5720 f.enable_dollar_recipients = FALSE;
5723 /* Now get the data for the message */
5725 more = receive_msg(extract_recipients);
5728 cancel_cutthrough_connection(TRUE, US"receive dropped");
5729 if (more) goto MORELOOP;
5730 smtp_log_no_mail(); /* Log no mail if configured */
5731 exim_exit(EXIT_FAILURE);
5736 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5737 smtp_log_no_mail(); /* Log no mail if configured */
5738 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5742 /* In the non-SMTP case, we have all the information from the command
5743 line, but must process it in case it is in the more general RFC822
5744 format, and in any case, to detect syntax errors. Also, it appears that
5745 the use of comma-separated lists as single arguments is common, so we
5746 had better support them. */
5751 int count = argc - recipients_arg;
5752 uschar **list = argv + recipients_arg;
5754 /* These options cannot be changed dynamically for non-SMTP messages */
5756 f.active_local_sender_retain = local_sender_retain;
5757 f.active_local_from_check = local_from_check;
5759 /* Save before any rewriting */
5761 raw_sender = string_copy(sender_address);
5763 /* Loop for each argument (supplied by user hence tainted) */
5765 for (int i = 0; i < count; i++)
5767 int start, end, domain;
5769 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5770 * We'll still want to cap it to something, just in case. */
5771 uschar * s = string_copy_taint(
5772 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5775 /* Loop for each comma-separated address */
5779 BOOL finished = FALSE;
5781 uschar *ss = parse_find_address_end(s, FALSE);
5783 if (*ss == ',') *ss = 0; else finished = TRUE;
5785 /* Check max recipients - if -t was used, these aren't recipients */
5787 if (recipients_max > 0 && ++rcount > recipients_max &&
5788 !extract_recipients)
5789 if (error_handling == ERRORS_STDERR)
5791 fprintf(stderr, "exim: too many recipients\n");
5792 exim_exit(EXIT_FAILURE);
5796 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5797 errors_sender_rc : EXIT_FAILURE;
5801 BOOL b = allow_utf8_domains;
5802 allow_utf8_domains = TRUE;
5805 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5809 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5810 else allow_utf8_domains = b;
5815 if (domain == 0 && !f.allow_unqualified_recipient)
5818 errmess = US"unqualified recipient address not allowed";
5822 if (error_handling == ERRORS_STDERR)
5824 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5825 string_printing(list[i]), errmess);
5826 exim_exit(EXIT_FAILURE);
5832 eblock.text1 = string_printing(list[i]);
5833 eblock.text2 = errmess;
5835 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5836 errors_sender_rc : EXIT_FAILURE;
5839 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5842 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5846 /* Show the recipients when debugging */
5850 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5851 if (recipients_list)
5853 debug_printf("Recipients:\n");
5854 for (int i = 0; i < recipients_count; i++)
5855 debug_printf(" %s\n", recipients_list[i].address);
5859 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5860 ignored; rejecting here would just add complication, and it can just as
5861 well be done later. Allow $recipients to be visible in the ACL. */
5863 if (acl_not_smtp_start)
5865 uschar *user_msg, *log_msg;
5866 f.enable_dollar_recipients = TRUE;
5867 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5868 &user_msg, &log_msg);
5869 f.enable_dollar_recipients = FALSE;
5872 /* Pause for a while waiting for input. If none received in that time,
5873 close the logfile, if we had one open; then if we wait for a long-running
5874 datasource (months, in one use-case) log rotation will not leave us holding
5877 if (!receive_timeout)
5878 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5881 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5882 will just read the headers for the message, and not write anything onto the
5885 message_ended = END_NOTENDED;
5886 more = receive_msg(extract_recipients);
5888 /* more is always FALSE here (not SMTP message) when reading a message
5889 for real; when reading the headers of a message for filter testing,
5890 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5892 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5893 } /* Non-SMTP message reception */
5895 /* If this is a filter testing run, there are headers in store, but
5896 no message on the spool. Run the filtering code in testing mode, setting
5897 the domain to the qualify domain and the local part to the current user,
5898 unless they have been set by options. The prefix and suffix are left unset
5899 unless specified. The the return path is set to to the sender unless it has
5900 already been set from a return-path header in the message. */
5902 if (filter_test != FTEST_NONE)
5904 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5905 deliver_domain_orig = deliver_domain;
5906 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5907 deliver_localpart_orig = deliver_localpart;
5908 deliver_localpart_prefix = US ftest_prefix;
5909 deliver_localpart_suffix = US ftest_suffix;
5910 deliver_home = originator_home;
5914 printf("Return-path copied from sender\n");
5915 return_path = string_copy(sender_address);
5918 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5919 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5921 receive_add_recipient(
5922 string_sprintf("%s%s%s@%s",
5923 ftest_prefix ? ftest_prefix : US"",
5925 ftest_suffix ? ftest_suffix : US"",
5926 deliver_domain), -1);
5928 printf("Recipient = %s\n", recipients_list[0].address);
5929 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5930 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5932 if (chdir("/")) /* Get away from wherever the user is running this from */
5934 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5935 exim_exit(EXIT_FAILURE);
5938 /* Now we run either a system filter test, or a user filter test, or both.
5939 In the latter case, headers added by the system filter will persist and be
5940 available to the user filter. We need to copy the filter variables
5943 if (filter_test & FTEST_SYSTEM)
5944 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5945 exim_exit(EXIT_FAILURE);
5947 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5949 if (filter_test & FTEST_USER)
5950 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5951 exim_exit(EXIT_FAILURE);
5953 exim_exit(EXIT_SUCCESS);
5956 /* Else act on the result of message reception. We should not get here unless
5957 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5958 will be TRUE. If it is not, check on the number of messages received in this
5961 if ( !session_local_queue_only
5962 && smtp_accept_queue_per_connection > 0
5963 && receive_messagecount > smtp_accept_queue_per_connection)
5965 session_local_queue_only = TRUE;
5966 queue_only_reason = 2;
5969 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5970 and queue_only_load is set, check that the load average is below it. If it is
5971 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5972 default), we put the whole session into queue_only mode. It then remains this
5973 way for any subsequent messages on the same SMTP connection. This is a
5974 deliberate choice; even though the load average may fall, it doesn't seem
5975 right to deliver later messages on the same call when not delivering earlier
5976 ones. However, there are odd cases where this is not wanted, so this can be
5977 changed by setting queue_only_load_latch false. */
5979 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5980 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5982 queue_only_reason = 3;
5983 if (queue_only_load_latch) session_local_queue_only = TRUE;
5986 /* If running as an MUA wrapper, all queueing options and freezing options
5990 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5992 /* Log the queueing here, when it will get a message id attached, but
5993 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5996 if (local_queue_only)
5998 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5999 switch(queue_only_reason)
6002 log_write(L_delay_delivery,
6003 LOG_MAIN, "no immediate delivery: more than %d messages "
6004 "received in one connection", smtp_accept_queue_per_connection);
6008 log_write(L_delay_delivery,
6009 LOG_MAIN, "no immediate delivery: load average %.2f",
6010 (double)load_average/1000.0);
6015 else if (f.queue_only_policy || f.deliver_freeze)
6016 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6018 /* Else do the delivery unless the ACL or local_scan() called for queue only
6019 or froze the message. Always deliver in a separate process. A fork failure is
6020 not a disaster, as the delivery will eventually happen on a subsequent queue
6021 run. The search cache must be tidied before the fork, as the parent will
6022 do it before exiting. The child will trigger a lookup failure and
6023 thereby defer the delivery if it tries to use (for example) a cached ldap
6024 connection that the parent has called unbind on. */
6031 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6034 close_unwanted(); /* Close unwanted file descriptors and TLS */
6035 exim_nullstd(); /* Ensure std{in,out,err} exist */
6037 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6038 mode, deliver_drop_privilege is forced TRUE). */
6040 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6042 delivery_re_exec(CEE_EXEC_EXIT);
6043 /* Control does not return here. */
6046 /* No need to re-exec */
6048 rc = deliver_message(message_id, FALSE, FALSE);
6050 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6051 ? EXIT_SUCCESS : EXIT_FAILURE);
6056 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6057 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6058 "process: %s", strerror(errno));
6062 release_cutthrough_connection(US"msg passed for delivery");
6064 /* In the parent, wait if synchronous delivery is required. This will
6065 always be the case in MUA wrapper mode. */
6067 if (f.synchronous_delivery)
6070 while (wait(&status) != pid);
6071 if ((status & 0x00ff) != 0)
6072 log_write(0, LOG_MAIN|LOG_PANIC,
6073 "process %d crashed with signal %d while delivering %s",
6074 (int)pid, status & 0x00ff, message_id);
6075 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6080 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6081 automatically reaps children (see comments above the loop), clear away any
6082 finished subprocesses here, in case there are lots of messages coming in
6083 from the same source. */
6085 #ifndef SIG_IGN_WORKS
6086 while (waitpid(-1, NULL, WNOHANG) > 0);
6090 return_path = sender_address = NULL;
6091 authenticated_sender = NULL;
6092 deliver_localpart_orig = NULL;
6093 deliver_domain_orig = NULL;
6094 deliver_host = deliver_host_address = NULL;
6095 dnslist_domain = dnslist_matched = NULL;
6096 #ifdef WITH_CONTENT_SCAN
6097 malware_name = NULL;
6100 callout_address = NULL;
6101 sending_ip_address = NULL;
6102 deliver_localpart_data = deliver_domain_data =
6103 recipient_data = sender_data = NULL;
6106 store_reset(reset_point);
6109 exim_exit(EXIT_SUCCESS); /* Never returns */
6110 return 0; /* To stop compiler warning */