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 #ifdef EXPERIMENTAL_XCLIENT
1136 g = string_cat(g, US" Experimental_XCLIENT");
1138 g = string_cat(g, US"\n");
1140 g = string_cat(g, US"Lookups (built-in):");
1141 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1142 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1144 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1145 g = string_cat(g, US" cdb");
1147 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1148 g = string_cat(g, US" dbm dbmjz dbmnz");
1150 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1151 g = string_cat(g, US" dnsdb");
1153 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1154 g = string_cat(g, US" dsearch");
1156 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1157 g = string_cat(g, US" ibase");
1159 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1160 g = string_cat(g, US" json");
1162 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1163 g = string_cat(g, US" ldap ldapdn ldapm");
1166 g = string_cat(g, US" lmdb");
1168 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1169 g = string_cat(g, US" mysql");
1171 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1172 g = string_cat(g, US" nis nis0");
1174 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1175 g = string_cat(g, US" nisplus");
1177 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1178 g = string_cat(g, US" oracle");
1180 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1181 g = string_cat(g, US" passwd");
1183 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1184 g = string_cat(g, US" pgsql");
1186 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1187 g = string_cat(g, US" redis");
1189 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1190 g = string_cat(g, US" sqlite");
1192 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1193 g = string_cat(g, US" testdb");
1195 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1196 g = string_cat(g, US" whoson");
1198 g = string_cat(g, US"\n");
1200 g = auth_show_supported(g);
1201 g = route_show_supported(g);
1202 g = transport_show_supported(g);
1204 #ifdef WITH_CONTENT_SCAN
1205 g = malware_show_supported(g);
1207 show_string(is_stdout, g); g = NULL;
1209 if (fixed_never_users[0] > 0)
1212 g = string_cat(g, US"Fixed never_users: ");
1213 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1214 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1215 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1218 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1220 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1222 /* Everything else is details which are only worth reporting when debugging.
1223 Perhaps the tls_version_report should move into this too. */
1227 /* clang defines __GNUC__ (at least, for me) so test for it first */
1228 #if defined(__clang__)
1229 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1230 #elif defined(__GNUC__)
1232 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1234 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1237 g = string_cat(g, US"Compiler: <unknown>\n");
1240 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1241 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1242 __GLIBC__, __GLIBC_MINOR__);
1243 if (__GLIBC_PREREQ(2, 1))
1244 g = string_fmt_append(g, " Runtime: %s\n",
1245 gnu_get_libc_version());
1248 g = show_db_version(g);
1251 g = tls_version_report(g);
1254 g = utf8_version_report(g);
1256 #ifdef SUPPORT_DMARC
1257 g = dmarc_version_report(g);
1260 g = spf_lib_version_report(g);
1263 show_string(is_stdout, g);
1266 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1267 if (authi->version_report)
1268 g = (*authi->version_report)(g);
1270 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1271 characters; unless it's an ancient version of PCRE in which case it
1273 #ifndef PCRE_PRERELEASE
1274 # define PCRE_PRERELEASE
1277 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1280 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1281 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1283 PCRE2_MAJOR, PCRE2_MINOR,
1284 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1288 #undef EXPAND_AND_QUOTE
1290 show_string(is_stdout, g);
1294 for (int i = 0; i < lookup_list_count; i++)
1295 if (lookup_list[i]->version_report)
1296 g = lookup_list[i]->version_report(g);
1297 show_string(is_stdout, g);
1300 #ifdef WHITELIST_D_MACROS
1301 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1303 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1305 #ifdef TRUSTED_CONFIG_LIST
1306 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1308 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1312 show_string(is_stdout, g);
1313 store_reset(reset_point);
1317 /*************************************************
1318 * Show auxiliary information about Exim *
1319 *************************************************/
1322 show_exim_information(enum commandline_info request, FILE *stream)
1327 fprintf(stream, "Oops, something went wrong.\n");
1331 "The -bI: flag takes a string indicating which information to provide.\n"
1332 "If the string is not recognised, you'll get this help (on stderr).\n"
1334 " exim -bI:help this information\n"
1335 " exim -bI:dscp list of known dscp value keywords\n"
1336 " exim -bI:sieve list of supported sieve extensions\n"
1340 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1341 fprintf(stream, "%s\n", *pp);
1344 dscp_list_to_stream(stream);
1350 /*************************************************
1351 * Quote a local part *
1352 *************************************************/
1354 /* This function is used when a sender address or a From: or Sender: header
1355 line is being created from the caller's login, or from an authenticated_id. It
1356 applies appropriate quoting rules for a local part.
1358 Argument: the local part
1359 Returns: the local part, quoted if necessary
1363 local_part_quote(uschar *lpart)
1365 BOOL needs_quote = FALSE;
1368 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1370 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1371 (*t != '.' || t == lpart || t[1] == 0);
1374 if (!needs_quote) return lpart;
1376 g = string_catn(NULL, US"\"", 1);
1380 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1383 g = string_cat(g, lpart);
1386 g = string_catn(g, lpart, nq - lpart);
1387 g = string_catn(g, US"\\", 1);
1388 g = string_catn(g, nq, 1);
1392 g = string_catn(g, US"\"", 1);
1393 return string_from_gstring(g);
1399 /*************************************************
1400 * Load readline() functions *
1401 *************************************************/
1403 /* This function is called from testing executions that read data from stdin,
1404 but only when running as the calling user. Currently, only -be does this. The
1405 function loads the readline() function library and passes back the functions.
1406 On some systems, it needs the curses library, so load that too, but try without
1407 it if loading fails. All this functionality has to be requested at build time.
1410 fn_readline_ptr pointer to where to put the readline pointer
1411 fn_addhist_ptr pointer to where to put the addhistory function
1413 Returns: the dlopen handle or NULL on failure
1417 set_readline(char * (**fn_readline_ptr)(const char *),
1418 void (**fn_addhist_ptr)(const char *))
1421 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1423 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1424 if (dlhandle_curses) dlclose(dlhandle_curses);
1428 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1429 * char * readline (const char *prompt);
1430 * void add_history (const char *string);
1432 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1433 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1436 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1444 /*************************************************
1445 * Get a line from stdin for testing things *
1446 *************************************************/
1448 /* This function is called when running tests that can take a number of lines
1449 of input (for example, -be and -bt). It handles continuations and trailing
1450 spaces. And prompting and a blank line output on eof. If readline() is in use,
1451 the arguments are non-NULL and provide the relevant functions.
1454 fn_readline readline function or NULL
1455 fn_addhist addhist function or NULL
1457 Returns: pointer to dynamic memory, or NULL at end of file
1461 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1464 BOOL had_input = FALSE;
1466 if (!fn_readline) { printf("> "); fflush(stdout); }
1468 for (int i = 0;; i++)
1470 uschar buffer[1024];
1474 char *readline_line = NULL;
1477 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1478 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1479 p = US readline_line;
1484 /* readline() not in use */
1487 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1491 /* Handle the line */
1494 ss = p + Ustrlen(p);
1495 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1498 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1500 g = string_catn(g, p, ss - p);
1503 if (fn_readline) free(readline_line);
1506 /* g can only be NULL if ss==p */
1507 if (ss == p || gstring_last_char(g) != '\\') /* not continuation; done */
1510 gstring_trim(g, 1); /* drop the \ */
1513 if (had_input) return g ? string_from_gstring(g) : US"";
1520 /*************************************************
1521 * Output usage information for the program *
1522 *************************************************/
1524 /* This function is called when there are no recipients
1525 or a specific --help argument was added.
1528 progname information on what name we were called by
1530 Returns: DOES NOT RETURN
1534 exim_usage(uschar *progname)
1537 /* Handle specific program invocation variants */
1538 if (Ustrcmp(progname, US"-mailq") == 0)
1540 "mailq - list the contents of the mail queue\n\n"
1541 "For a list of options, see the Exim documentation.\n");
1543 /* Generic usage - we output this whatever happens */
1545 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1546 "not directly from a shell command line. Options and/or arguments control\n"
1547 "what it does when called. For a list of options, see the Exim documentation.\n");
1552 /*************************************************
1553 * Validate that the macros given are okay *
1554 *************************************************/
1556 /* Typically, Exim will drop privileges if macros are supplied. In some
1557 cases, we want to not do so.
1559 Arguments: opt_D_used - true if the commandline had a "-D" option
1560 Returns: true if trusted, false otherwise
1564 macros_trusted(BOOL opt_D_used)
1566 #ifdef WHITELIST_D_MACROS
1567 uschar *whitelisted, *end, *p, **whites;
1568 int white_count, i, n;
1570 BOOL prev_char_item, found;
1575 #ifndef WHITELIST_D_MACROS
1579 /* We only trust -D overrides for some invoking users:
1580 root, the exim run-time user, the optional config owner user.
1581 I don't know why config-owner would be needed, but since they can own the
1582 config files anyway, there's no security risk to letting them override -D. */
1583 if ( ! ((real_uid == root_uid)
1584 || (real_uid == exim_uid)
1585 #ifdef CONFIGURE_OWNER
1586 || (real_uid == config_uid)
1590 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1594 /* Get a list of macros which are whitelisted */
1595 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1596 prev_char_item = FALSE;
1598 for (p = whitelisted; *p != '\0'; ++p)
1600 if (*p == ':' || isspace(*p))
1605 prev_char_item = FALSE;
1608 if (!prev_char_item)
1609 prev_char_item = TRUE;
1616 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1617 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1622 if (i == white_count)
1624 while (*p != '\0' && p < end)
1630 /* The list of commandline macros should be very short.
1631 Accept the N*M complexity. */
1632 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1635 for (uschar ** w = whites; *w; ++w)
1636 if (Ustrcmp(*w, m->name) == 0)
1643 if (!m->replacement)
1645 if ((len = m->replen) == 0)
1647 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1650 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1656 /*************************************************
1657 * Expansion testing *
1658 *************************************************/
1660 /* Expand and print one item, doing macro-processing.
1663 item line for expansion
1667 expansion_test_line(const uschar * line)
1673 Ustrncpy(big_buffer, line, big_buffer_size);
1674 big_buffer[big_buffer_size-1] = '\0';
1675 len = Ustrlen(big_buffer);
1677 (void) macros_expand(0, &len, &dummy_macexp);
1679 if (isupper(big_buffer[0]))
1681 if (macro_read_assignment(big_buffer))
1682 printf("Defined macro '%s'\n", mlast->name);
1684 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1685 printf("%s\n", acl_standalone_setvar(big_buffer+4));
1687 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1688 else printf("Failed: %s\n", expand_string_message);
1693 /*************************************************
1694 * Queue-runner operations *
1695 *************************************************/
1697 /* Prefix a new qrunner descriptor to the qrunners list */
1702 qrunner * q = qrunners;
1703 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1704 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1706 qrunners->next_tick = time(NULL); /* run right away */
1711 alloc_onetime_qrunner(void)
1713 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1714 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1715 qrunners->next_tick = time(NULL); /* run right away */
1716 qrunners->run_max = 1;
1721 /*************************************************
1722 * Entry point and high-level code *
1723 *************************************************/
1725 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1726 the appropriate action. All the necessary functions are present in the one
1727 binary. I originally thought one should split it up, but it turns out that so
1728 much of the apparatus is needed in each chunk that one might as well just have
1729 it all available all the time, which then makes the coding easier as well.
1732 argc count of entries in argv
1733 argv argument strings, with argv[0] being the program name
1735 Returns: EXIT_SUCCESS if terminated successfully
1736 EXIT_FAILURE otherwise, except when a message has been sent
1737 to the sender, and -oee was given
1741 main(int argc, char **cargv)
1743 uschar **argv = USS cargv;
1744 int arg_receive_timeout = -1;
1745 int arg_smtp_receive_timeout = -1;
1746 int arg_error_handling = error_handling;
1747 int filter_sfd = -1;
1748 int filter_ufd = -1;
1751 int list_queue_option = QL_BASIC;
1753 int msg_action_arg = -1;
1754 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1755 int queue_only_reason = 0;
1757 int perl_start_option = 0;
1759 int recipients_arg = argc;
1760 int sender_address_domain = 0;
1761 int test_retry_arg = -1;
1762 int test_rewrite_arg = -1;
1763 gid_t original_egid;
1764 BOOL arg_queue_only = FALSE;
1765 BOOL bi_option = FALSE;
1766 BOOL checking = FALSE;
1767 BOOL count_queue = FALSE;
1768 BOOL expansion_test = FALSE;
1769 BOOL extract_recipients = FALSE;
1770 BOOL flag_G = FALSE;
1771 BOOL flag_n = FALSE;
1772 BOOL forced_delivery = FALSE;
1773 BOOL f_end_dot = FALSE;
1774 BOOL deliver_give_up = FALSE;
1775 BOOL list_queue = FALSE;
1776 BOOL list_options = FALSE;
1777 BOOL list_config = FALSE;
1778 BOOL local_queue_only;
1779 BOOL one_msg_action = FALSE;
1780 BOOL opt_D_used = FALSE;
1781 BOOL queue_only_set = FALSE;
1782 BOOL receiving_message = TRUE;
1783 BOOL sender_ident_set = FALSE;
1784 BOOL session_local_queue_only;
1786 BOOL removed_privilege = FALSE;
1787 BOOL usage_wanted = FALSE;
1788 BOOL verify_address_mode = FALSE;
1789 BOOL verify_as_sender = FALSE;
1790 BOOL rcpt_verify_quota = FALSE;
1791 BOOL version_printed = FALSE;
1792 uschar *alias_arg = NULL;
1793 uschar *called_as = US"";
1794 uschar *cmdline_syslog_name = NULL;
1795 uschar *start_queue_run_id = NULL;
1796 uschar *stop_queue_run_id = NULL;
1797 uschar *expansion_test_message = NULL;
1798 const uschar *ftest_domain = NULL;
1799 const uschar *ftest_localpart = NULL;
1800 const uschar *ftest_prefix = NULL;
1801 const uschar *ftest_suffix = NULL;
1802 uschar *log_oneline = NULL;
1803 uschar *malware_test_file = NULL;
1804 uschar *real_sender_address;
1805 uschar *originator_home = US"/";
1809 struct stat statbuf;
1810 pid_t passed_qr_pid = (pid_t)0;
1811 int passed_qr_pipe = -1;
1812 gid_t group_list[EXIM_GROUPLIST_SIZE];
1814 /* For the -bI: flag */
1815 enum commandline_info info_flag = CMDINFO_NONE;
1816 BOOL info_stdout = FALSE;
1818 /* Possible options for -R and -S */
1820 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1822 /* Need to define this in case we need to change the environment in order
1823 to get rid of a bogus time zone. We have to make it char rather than uschar
1824 because some OS define it in /usr/include/unistd.h. */
1826 extern char **environ;
1828 #ifdef MEASURE_TIMING
1829 (void)gettimeofday(×tamp_startup, NULL);
1832 store_init(); /* Initialise the memory allocation susbsystem */
1833 pcre_init(); /* Set up memory handling for pcre */
1835 /* If the Exim user and/or group and/or the configuration file owner/group were
1836 defined by ref:name at build time, we must now find the actual uid/gid values.
1837 This is a feature to make the lives of binary distributors easier. */
1839 #ifdef EXIM_USERNAME
1840 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1843 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1845 /* If ref:name uses a number as the name, route_finduser() returns
1846 TRUE with exim_uid set and pw coerced to NULL. */
1848 exim_gid = pw->pw_gid;
1849 #ifndef EXIM_GROUPNAME
1852 "exim: ref:name should specify a usercode, not a group.\n"
1853 "exim: can't let you get away with it unless you also specify a group.\n");
1857 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1860 #ifdef EXIM_GROUPNAME
1861 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1862 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1865 #ifdef CONFIGURE_OWNERNAME
1866 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1867 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1868 CONFIGURE_OWNERNAME);
1871 /* We default the system_filter_user to be the Exim run-time user, as a
1872 sane non-root value. */
1873 system_filter_uid = exim_uid;
1875 #ifdef CONFIGURE_GROUPNAME
1876 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1877 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1878 CONFIGURE_GROUPNAME);
1881 /* In the Cygwin environment, some initialization used to need doing.
1882 It was fudged in by means of this macro; now no longer but we'll leave
1883 it in case of others. */
1889 /* Check a field which is patched when we are running Exim within its
1890 testing harness; do a fast initial check, and then the whole thing. */
1892 f.running_in_test_harness =
1893 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1894 if (f.running_in_test_harness)
1897 /* Protect against abusive argv[0] */
1898 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1899 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1901 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1902 at the start of a program; however, it seems that some environments do not
1903 follow this. A "strange" locale can affect the formatting of timestamps, so we
1906 setlocale(LC_ALL, "C");
1908 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1910 #ifdef _POSIX_MONOTONIC_CLOCK
1914 /* Set up the default handler for timing using alarm(). */
1916 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1918 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1919 because store_malloc writes a log entry on failure. */
1921 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1922 exim_fail("exim: failed to get store for log buffer\n");
1924 /* Initialize the default log options. */
1926 bits_set(log_selector, log_selector_size, log_default);
1928 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1929 NULL when the daemon is run and the file is closed. We have to use this
1930 indirection, because some systems don't allow writing to the variable "stderr".
1933 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1935 /* Ensure there is a big buffer for temporary use in several places. It is put
1936 in malloc store so that it can be freed for enlargement if necessary. */
1938 big_buffer = store_malloc(big_buffer_size);
1940 /* Set up the handler for the data request signal, and set the initial
1941 descriptive text. */
1943 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1944 set_process_info("initializing");
1945 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1948 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1949 sigaction(SIGSEGV, &act, NULL);
1952 signal(SIGSEGV, segv_handler); /* log faults */
1955 /* If running in a dockerized environment, the TERM signal is only
1956 delegated to the PID 1 if we request it by setting an signal handler */
1958 if (getpid() == 1) signal(SIGTERM, term_handler);
1960 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1961 in the daemon code. For the rest of Exim's uses, we ignore it. */
1963 signal(SIGHUP, SIG_IGN);
1965 /* We don't want to die on pipe errors as the code is written to handle
1966 the write error instead. */
1968 signal(SIGPIPE, SIG_IGN);
1970 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1971 set to SIG_IGN. This causes subprocesses that complete before the parent
1972 process waits for them not to hang around, so when Exim calls wait(), nothing
1973 is there. The wait() code has been made robust against this, but let's ensure
1974 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1975 ending status. We use sigaction rather than plain signal() on those OS where
1976 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1977 problem on AIX with this.) */
1981 struct sigaction act;
1982 act.sa_handler = SIG_DFL;
1983 sigemptyset(&(act.sa_mask));
1985 sigaction(SIGCHLD, &act, NULL);
1988 signal(SIGCHLD, SIG_DFL);
1991 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1996 /* Set up the version number. Set up the leading 'E' for the external form of
1997 message ids, set the pointer to the internal form, and initialize it to
1998 indicate no message being processed. */
2001 message_id_option[0] = '-';
2002 message_id_external = message_id_option + 1;
2003 message_id_external[0] = 'E';
2004 message_id = message_id_external + 1;
2007 /* Set the umask to zero so that any files Exim creates using open() are
2008 created with the modes that it specifies. NOTE: Files created with fopen() have
2009 a problem, which was not recognized till rather late (February 2006). With this
2010 umask, such files will be world writeable. (They are all content scanning files
2011 in the spool directory, which isn't world-accessible, so this is not a
2012 disaster, but it's untidy.) I don't want to change this overall setting,
2013 however, because it will interact badly with the open() calls. Instead, there's
2014 now a function called modefopen() that fiddles with the umask while calling
2019 /* Precompile the regular expression for matching a message id. Keep this in
2020 step with the code that generates ids in the accept.c module. We need to do
2021 this here, because the -M options check their arguments for syntactic validity
2022 using mac_ismsgid, which uses this. */
2025 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
2027 /* Precompile the regular expression that is used for matching an SMTP error
2028 code, possibly extended, at the start of an error message. Note that the
2029 terminating whitespace character is included. */
2032 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2035 #ifdef WHITELIST_D_MACROS
2036 /* Precompile the regular expression used to filter the content of macros
2037 given to -D for permissibility. */
2039 regex_whitelisted_macro =
2040 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2043 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2044 this seems to be a generally accepted convention, since one finds symbolic
2045 links called "mailq" in standard OS configurations. */
2047 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2048 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2051 receiving_message = FALSE;
2052 called_as = US"-mailq";
2055 /* If the program is called as "rmail" treat it as equivalent to
2056 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2057 i.e. preventing a single dot on a line from terminating the message, and
2058 returning with zero return code, even in cases of error (provided an error
2059 message has been sent). */
2061 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2062 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2065 called_as = US"-rmail";
2066 errors_sender_rc = EXIT_SUCCESS;
2069 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2070 this is a smail convention. */
2072 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2073 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2075 smtp_input = smtp_batched_input = TRUE;
2076 called_as = US"-rsmtp";
2079 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2080 this is a smail convention. */
2082 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2083 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2085 alloc_onetime_qrunner();
2086 receiving_message = FALSE;
2087 called_as = US"-runq";
2090 /* If the program is called as "newaliases" treat it as equivalent to
2091 "exim -bi"; this is a sendmail convention. */
2093 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2094 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2097 receiving_message = FALSE;
2098 called_as = US"-newaliases";
2101 /* Save the original effective uid for a couple of uses later. It should
2102 normally be root, but in some esoteric environments it may not be. */
2104 original_euid = geteuid();
2105 original_egid = getegid();
2107 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2108 to be the same as the real ones. This makes a difference only if Exim is setuid
2109 (or setgid) to something other than root, which could be the case in some
2110 special configurations. */
2112 real_uid = getuid();
2113 real_gid = getgid();
2115 if (real_uid == root_uid)
2117 if ((rv = setgid(real_gid)))
2118 exim_fail("exim: setgid(%ld) failed: %s\n",
2119 (long int)real_gid, strerror(errno));
2120 if ((rv = setuid(real_uid)))
2121 exim_fail("exim: setuid(%ld) failed: %s\n",
2122 (long int)real_uid, strerror(errno));
2125 /* If neither the original real uid nor the original euid was root, Exim is
2126 running in an unprivileged state. */
2128 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2130 /* For most of the args-parsing we need to use permanent pool memory */
2132 int old_pool = store_pool;
2133 store_pool = POOL_PERM;
2135 /* Scan the program's arguments. Some can be dealt with right away; others are
2136 simply recorded for checking and handling afterwards. Do a high-level switch
2137 on the second character (the one after '-'), to save some effort. */
2139 for (i = 1; i < argc; i++)
2141 BOOL badarg = FALSE;
2142 uschar * arg = argv[i];
2146 /* An argument not starting with '-' is the start of a recipients list;
2147 break out of the options-scanning loop. */
2155 /* An option consisting of -- terminates the options */
2157 if (Ustrcmp(arg, "--") == 0)
2159 recipients_arg = i + 1;
2163 /* Handle flagged options */
2165 switchchar = arg[1];
2168 /* Make all -ex options synonymous with -oex arguments, since that
2169 is assumed by various callers. Also make -qR options synonymous with -R
2170 options, as that seems to be required as well. Allow for -qqR too, and
2171 the same for -S options. */
2173 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2174 Ustrncmp(arg+1, "qR", 2) == 0 ||
2175 Ustrncmp(arg+1, "qS", 2) == 0)
2177 switchchar = arg[2];
2180 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2182 switchchar = arg[3];
2184 f.queue_2stage = TRUE;
2187 /* Make -r synonymous with -f, since it is a documented alias */
2189 else if (arg[1] == 'r') switchchar = 'f';
2191 /* Make -ov synonymous with -v */
2193 else if (Ustrcmp(arg, "-ov") == 0)
2199 /* deal with --option_aliases */
2200 else if (switchchar == '-')
2202 if (Ustrcmp(argrest, "help") == 0)
2204 usage_wanted = TRUE;
2207 else if (Ustrcmp(argrest, "version") == 0)
2214 /* High-level switch on active initial letter */
2219 /* sendmail uses -Ac and -Am to control which .cf file is used;
2222 if (!*argrest) { badarg = TRUE; break; }
2225 BOOL ignore = FALSE;
2230 if (*(argrest + 1) == '\0')
2234 if (!ignore) badarg = TRUE;
2238 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2239 so has no need of it. */
2242 if (!*argrest) i++; /* Skip over the type */
2248 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2252 /* -bd: Run in daemon mode, awaiting SMTP connections.
2253 -bdf: Ditto, but in the foreground.
2256 f.daemon_listen = f.daemon_scion = TRUE;
2257 if (*argrest == 'f') f.background_daemon = FALSE;
2258 else if (*argrest) badarg = TRUE;
2261 /* -be: Run in expansion test mode
2262 -bem: Ditto, but read a message from a file first
2265 expansion_test = checking = TRUE;
2266 if (*argrest == 'm')
2268 if (++i >= argc) { badarg = TRUE; break; }
2269 expansion_test_message = argv[i];
2272 if (*argrest) badarg = TRUE;
2275 /* -bF: Run system filter test */
2277 filter_test |= checking = FTEST_SYSTEM;
2278 if (*argrest) badarg = TRUE;
2279 else if (++i < argc) filter_test_sfile = argv[i];
2280 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2283 /* -bf: Run user filter test
2284 -bfd: Set domain for filter testing
2285 -bfl: Set local part for filter testing
2286 -bfp: Set prefix for filter testing
2287 -bfs: Set suffix for filter testing
2292 filter_test |= checking = FTEST_USER;
2293 if (++i < argc) filter_test_ufile = argv[i];
2294 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2299 exim_fail("exim: string expected after %s\n", arg);
2300 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2301 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2302 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2303 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2308 /* -bh: Host checking - an IP address must follow. */
2310 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2312 if (++i >= argc) { badarg = TRUE; break; }
2313 sender_host_address = string_copy_taint(
2314 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2316 host_checking = checking = f.log_testing_mode = TRUE;
2317 f.host_checking_callout = *argrest == 'c';
2318 message_logs = FALSE;
2323 /* -bi: This option is used by sendmail to initialize *the* alias file,
2324 though it has the -oA option to specify a different file. Exim has no
2325 concept of *the* alias file, but since Sun's YP make script calls
2326 sendmail this way, some support must be provided. */
2328 if (!*argrest) bi_option = TRUE;
2332 /* -bI: provide information, of the type to follow after a colon.
2333 This is an Exim flag. */
2335 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2337 uschar *p = argrest+1;
2338 info_flag = CMDINFO_HELP;
2340 if (strcmpic(p, CUS"sieve") == 0)
2342 info_flag = CMDINFO_SIEVE;
2345 else if (strcmpic(p, CUS"dscp") == 0)
2347 info_flag = CMDINFO_DSCP;
2350 else if (strcmpic(p, CUS"help") == 0)
2356 /* -bm: Accept and deliver message - the default option. Reinstate
2357 receiving_message, which got turned off for all -b options.
2358 -bmalware: test the filename given for malware */
2360 if (!*argrest) receiving_message = TRUE;
2361 else if (Ustrcmp(argrest, "alware") == 0)
2363 if (++i >= argc) { badarg = TRUE; break; }
2365 malware_test_file = argv[i];
2370 /* -bnq: For locally originating messages, do not qualify unqualified
2371 addresses. In the envelope, this causes errors; in header lines they
2374 if (Ustrcmp(argrest, "q") == 0)
2376 f.allow_unqualified_sender = FALSE;
2377 f.allow_unqualified_recipient = FALSE;
2382 /* -bpxx: List the contents of the mail queue, in various forms. If
2383 the option is -bpc, just a queue count is needed. Otherwise, if the
2384 first letter after p is r, then order is random. */
2386 if (*argrest == 'c')
2389 if (*++argrest) badarg = TRUE;
2393 if (*argrest == 'r')
2394 list_queue_option = QL_UNSORTED, argrest++;
2396 list_queue_option = QL_BASIC;
2400 /* -bp: List the contents of the mail queue, top-level only */
2404 /* -bpu: List the contents of the mail queue, top-level undelivered */
2406 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2408 /* -bpa: List the contents of the mail queue, including all delivered */
2410 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2412 /* -bpi: List only message IDs */
2414 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2416 /* Unknown after -bp[r] */
2422 /* -bP: List the configuration variables given as the address list.
2423 Force -v, so configuration errors get displayed. */
2426 /* -bP config: we need to setup here, because later,
2427 when list_options is checked, the config is read already */
2430 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2433 readconf_save_config(version_string);
2437 list_options = TRUE;
2438 debug_selector |= D_v;
2439 debug_file = stderr;
2443 /* -brt: Test retry configuration lookup */
2445 if (Ustrcmp(argrest, "t") == 0)
2448 test_retry_arg = i + 1;
2452 /* -brw: Test rewrite configuration */
2454 else if (Ustrcmp(argrest, "w") == 0)
2457 test_rewrite_arg = i + 1;
2463 /* -bS: Read SMTP commands on standard input, but produce no replies -
2464 all errors are reported by sending messages. */
2467 smtp_input = smtp_batched_input = receiving_message = TRUE;
2471 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2472 on standard output. */
2474 if (!*argrest) smtp_input = receiving_message = TRUE;
2478 /* -bt: address testing mode */
2481 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2485 /* -bv: verify addresses */
2488 verify_address_mode = checking = f.log_testing_mode = TRUE;
2490 /* -bvs: verify sender addresses */
2492 else if (Ustrcmp(argrest, "s") == 0)
2494 verify_address_mode = checking = f.log_testing_mode = TRUE;
2495 verify_as_sender = TRUE;
2500 /* -bV: Print version string and support details */
2504 printf("Exim version %s #%s built %s\n", version_string,
2505 version_cnumber, version_date);
2506 printf("%s\n", CS version_copyright);
2507 version_printed = TRUE;
2508 show_whats_supported(TRUE);
2509 f.log_testing_mode = TRUE;
2514 /* -bw: inetd wait mode, accept a listening socket as stdin */
2516 f.inetd_wait_mode = TRUE;
2517 f.background_daemon = FALSE;
2518 f.daemon_listen = f.daemon_scion = TRUE;
2520 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2521 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2532 /* -C: change configuration file list; ignore if it isn't really
2533 a change! Enforce a prefix check if required. */
2537 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2538 if (Ustrcmp(config_main_filelist, argrest) != 0)
2540 #ifdef ALT_CONFIG_PREFIX
2542 int len = Ustrlen(ALT_CONFIG_PREFIX);
2543 const uschar *list = argrest;
2545 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2546 while((filename = string_nextinlist(&list, &sep, big_buffer,
2548 if ( ( Ustrlen(filename) < len
2549 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2550 || Ustrstr(filename, "/../") != NULL
2552 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2554 exim_fail("-C Permission denied\n");
2556 if (real_uid != root_uid)
2558 #ifdef TRUSTED_CONFIG_LIST
2560 if (real_uid != exim_uid
2561 #ifdef CONFIGURE_OWNER
2562 && real_uid != config_uid
2565 f.trusted_config = FALSE;
2568 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2571 struct stat statbuf;
2573 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2574 (statbuf.st_uid != root_uid /* owner not root */
2575 #ifdef CONFIGURE_OWNER
2576 && statbuf.st_uid != config_uid /* owner not the special one */
2579 (statbuf.st_gid != root_gid /* group not root */
2580 #ifdef CONFIGURE_GROUP
2581 && statbuf.st_gid != config_gid /* group not the special one */
2583 && (statbuf.st_mode & 020) != 0 /* group writeable */
2585 (statbuf.st_mode & 2) != 0) /* world writeable */
2587 f.trusted_config = FALSE;
2592 /* Well, the trust list at least is up to scratch... */
2594 uschar *trusted_configs[32];
2597 int old_pool = store_pool;
2598 store_pool = POOL_MAIN;
2600 reset_point = store_mark();
2601 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2603 uschar *start = big_buffer, *nl;
2604 while (*start && isspace(*start))
2608 nl = Ustrchr(start, '\n');
2611 trusted_configs[nr_configs++] = string_copy(start);
2612 if (nr_configs == nelem(trusted_configs))
2620 const uschar *list = argrest;
2622 while (f.trusted_config && (filename = string_nextinlist(&list,
2623 &sep, big_buffer, big_buffer_size)))
2625 for (i=0; i < nr_configs; i++)
2626 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2628 if (i == nr_configs)
2630 f.trusted_config = FALSE;
2635 else /* No valid prefixes found in trust_list file. */
2636 f.trusted_config = FALSE;
2637 store_reset(reset_point);
2638 store_pool = old_pool;
2641 else /* Could not open trust_list file. */
2642 f.trusted_config = FALSE;
2645 /* Not root; don't trust config */
2646 f.trusted_config = FALSE;
2650 config_main_filelist = argrest;
2651 f.config_changed = TRUE;
2656 /* -D: set up a macro definition */
2659 #ifdef DISABLE_D_OPTION
2660 exim_fail("exim: -D is not available in this Exim binary\n");
2666 uschar *s = argrest;
2669 while (isspace(*s)) s++;
2671 if (*s < 'A' || *s > 'Z')
2672 exim_fail("exim: macro name set by -D must start with "
2673 "an upper case letter\n");
2675 while (isalnum(*s) || *s == '_')
2677 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2681 if (ptr == 0) { badarg = TRUE; break; }
2682 while (isspace(*s)) s++;
2685 if (*s++ != '=') { badarg = TRUE; break; }
2686 while (isspace(*s)) s++;
2689 for (m = macros_user; m; m = m->next)
2690 if (Ustrcmp(m->name, name) == 0)
2691 exim_fail("exim: duplicated -D in command line\n");
2693 m = macro_create(name, s, TRUE);
2695 if (clmacro_count >= MAX_CLMACROS)
2696 exim_fail("exim: too many -D options on command line\n");
2697 clmacros[clmacro_count++] =
2698 string_sprintf("-D%s=%s", m->name, m->replacement);
2705 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2707 if (Ustrcmp(argrest, "ropcr") == 0)
2709 /* drop_cr = TRUE; */
2712 /* -dp: Set up a debug pretrigger buffer with given size. */
2714 else if (Ustrcmp(argrest, "p") == 0)
2718 debug_pretrigger_setup(argv[i]);
2720 /* -dt: Set a debug trigger selector */
2722 else if (Ustrncmp(argrest, "t=", 2) == 0)
2723 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2725 /* -d: Set debug level (see also -v below).
2726 If -dd is used, debugging subprocesses of the daemon is disabled. */
2730 /* Use an intermediate variable so that we don't set debugging while
2731 decoding the debugging bits. */
2733 unsigned int selector = D_default;
2736 if (*argrest == 'd')
2738 f.debug_daemon = TRUE;
2742 decode_bits(&selector, 1, debug_notall, argrest,
2743 debug_options, debug_options_count, US"debug", 0);
2744 debug_selector = selector;
2749 /* -E: This is a local error message. This option is not intended for
2750 external use at all, but is not restricted to trusted callers because it
2751 does no harm (just suppresses certain error messages) and if Exim is run
2752 not setuid root it won't always be trusted when it generates error
2753 messages using this option. If there is a message id following -E, point
2754 message_reference at it, for logging. */
2757 f.local_error_message = TRUE;
2758 if (mac_ismsgid(argrest)) message_reference = argrest;
2762 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2763 option, so it looks as if historically the -oex options are also callable
2764 without the leading -o. So we have to accept them. Before the switch,
2765 anything starting -oe has been converted to -e. Exim does not support all
2766 of the sendmail error options. */
2769 if (Ustrcmp(argrest, "e") == 0)
2771 arg_error_handling = ERRORS_SENDER;
2772 errors_sender_rc = EXIT_SUCCESS;
2774 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2775 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2776 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2777 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2782 /* -F: Set sender's full name, used instead of the gecos entry from
2783 the password file. Since users can usually alter their gecos entries,
2784 there's no security involved in using this instead. The data can follow
2785 the -F or be in the next argument. */
2789 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2790 originator_name = string_copy_taint(
2791 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2793 f.sender_name_forced = TRUE;
2797 /* -f: Set sender's address - this value is only actually used if Exim is
2798 run by a trusted user, or if untrusted_set_sender is set and matches the
2799 address, except that the null address can always be set by any user. The
2800 test for this happens later, when the value given here is ignored when not
2801 permitted. For an untrusted user, the actual sender is still put in Sender:
2802 if it doesn't match the From: header (unless no_local_from_check is set).
2803 The data can follow the -f or be in the next argument. The -r switch is an
2804 obsolete form of -f but since there appear to be programs out there that
2805 use anything that sendmail has ever supported, better accept it - the
2806 synonymizing is done before the switch above.
2808 At this stage, we must allow domain literal addresses, because we don't
2809 know what the setting of allow_domain_literals is yet. Ditto for trailing
2810 dots and strip_trailing_dot. */
2814 int dummy_start, dummy_end;
2817 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2818 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2820 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2823 uschar * temp = argrest + Ustrlen(argrest) - 1;
2824 while (temp >= argrest && isspace(*temp)) temp--;
2825 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2826 allow_domain_literals = TRUE;
2827 strip_trailing_dot = TRUE;
2829 allow_utf8_domains = TRUE;
2831 if (!(sender_address = parse_extract_address(argrest, &errmess,
2832 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2833 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2835 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2837 message_smtputf8 = string_is_utf8(sender_address);
2838 allow_utf8_domains = FALSE;
2840 allow_domain_literals = FALSE;
2841 strip_trailing_dot = FALSE;
2843 f.sender_address_forced = TRUE;
2847 /* -G: sendmail invocation to specify that it's a gateway submission and
2848 sendmail may complain about problems instead of fixing them.
2849 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2850 not at this time complain about problems. */
2856 /* -h: Set the hop count for an incoming message. Exim does not currently
2857 support this; it always computes it by counting the Received: headers.
2858 To put it in will require a change to the spool header file format. */
2862 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2863 if (!isdigit(*argrest)) badarg = TRUE;
2867 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2868 not to be documented for sendmail but mailx (at least) uses it) */
2871 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2875 /* -L: set the identifier used for syslog; equivalent to setting
2876 syslog_processname in the config file, but needs to be an admin option. */
2880 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2881 if ((sz = Ustrlen(argrest)) > 32)
2882 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2884 exim_fail("exim: the -L syslog name is too short\n");
2885 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2889 receiving_message = FALSE;
2891 /* -MC: continue delivery of another message via an existing open
2892 file descriptor. This option is used for an internal call by the
2893 smtp transport when there is a pending message waiting to go to an
2894 address to which it has got a connection. Five subsequent arguments are
2895 required: transport name, host name, IP address, sequence number, and
2896 message_id. Transports may decline to create new processes if the sequence
2897 number gets too big. The channel is stdin. This (-MC) must be the last
2898 argument. There's a subsequent check that the real-uid is privileged.
2900 If we are running in the test harness. delay for a bit, to let the process
2901 that set this one up complete. This makes for repeatability of the logging,
2904 if (Ustrcmp(argrest, "C") == 0)
2906 union sockaddr_46 interface_sock;
2907 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2910 exim_fail("exim: too many or too few arguments after -MC\n");
2912 if (msg_action_arg >= 0)
2913 exim_fail("exim: incompatible arguments\n");
2915 continue_transport = string_copy_taint(
2916 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2918 continue_hostname = string_copy_taint(
2919 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2921 continue_host_address = string_copy_taint(
2922 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2924 continue_sequence = Uatoi(argv[++i]);
2925 msg_action = MSG_DELIVER;
2926 msg_action_arg = ++i;
2927 forced_delivery = TRUE;
2928 queue_run_pid = passed_qr_pid;
2929 queue_run_pipe = passed_qr_pipe;
2931 if (!mac_ismsgid(argv[i]))
2932 exim_fail("exim: malformed message id %s after -MC option\n",
2935 /* Set up $sending_ip_address and $sending_port, unless proxied */
2937 if (!continue_proxy_cipher)
2938 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2940 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2943 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2946 testharness_pause_ms(500);
2950 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2954 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2955 precedes -MC (see above). The flag indicates that the host to which
2956 Exim is connected has accepted an AUTH sequence. */
2958 case 'A': f.smtp_authenticated = TRUE; break;
2960 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2961 that exim is connected to supports the esmtp extension DSN */
2963 case 'D': smtp_peer_options |= OPTION_DSN; break;
2965 /* -MCd: for debug, set a process-purpose string */
2967 case 'd': if (++i < argc)
2968 process_purpose = string_copy_taint(
2969 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2974 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2975 from the commandline should be tainted - but we will need an untainted
2976 value for the spoolfile when doing a -odi delivery process. */
2978 case 'G': if (++i < argc) queue_name = string_copy_taint(
2979 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2984 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2986 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2988 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2989 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2990 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2992 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2994 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2999 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
3000 it preceded -MC (see above) */
3002 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3004 #ifdef SUPPORT_SOCKS
3005 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3006 case 'p': proxy_session = TRUE;
3009 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3012 proxy_local_port = Uatoi(argv[i]);
3015 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3018 proxy_external_port = Uatoi(argv[i]);
3024 /* -MCQ: pass on the pid of the queue-running process that started
3025 this chain of deliveries and the fd of its synchronizing pipe; this
3026 is useful only when it precedes -MC (see above) */
3028 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3030 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3034 /* -MCq: do a quota check on the given recipient for the given size
3035 of message. Separate from -MC. */
3036 case 'q': rcpt_verify_quota = TRUE;
3037 if (++i < argc) message_size = Uatoi(argv[i]);
3041 /* -MCS: set the smtp_use_size flag; this is useful only when it
3042 precedes -MC (see above) */
3044 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3047 /* -MCs: used with -MCt; SNI was sent */
3048 /* -MCr: ditto, DANE */
3051 case 's': if (++i < argc)
3053 continue_proxy_sni = string_copy_taint(
3054 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3056 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3061 /* -MCt: similar to -MCT below but the connection is still open
3062 via a proxy process which handles the TLS context and coding.
3063 Require three arguments for the proxied local address and port,
3064 and the TLS cipher. */
3066 case 't': if (++i < argc)
3067 sending_ip_address = string_copy_taint(
3068 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3072 sending_port = (int)(Uatol(argv[i]));
3075 continue_proxy_cipher = string_copy_taint(
3076 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3081 /* -MCT: set the tls_offered flag; this is useful only when it
3082 precedes -MC (see above). The flag indicates that the host to which
3083 Exim is connected has offered TLS support. */
3085 case 'T': smtp_peer_options |= OPTION_TLS; break;
3088 default: badarg = TRUE; break;
3093 /* -M[x]: various operations on the following list of message ids:
3094 -M deliver the messages, ignoring next retry times and thawing
3095 -Mc deliver the messages, checking next retry times, no thawing
3096 -Mf freeze the messages
3097 -Mg give up on the messages
3098 -Mt thaw the messages
3099 -Mrm remove the messages
3100 In the above cases, this must be the last option. There are also the
3101 following options which are followed by a single message id, and which
3102 act on that message. Some of them use the "recipient" addresses as well.
3103 -Mar add recipient(s)
3104 -MG move to a different queue
3105 -Mmad mark all recipients delivered
3106 -Mmd mark recipients(s) delivered
3108 -Mset load a message for use with -be
3110 -Mvc show copy (of whole message, in RFC 2822 format)
3117 msg_action = MSG_DELIVER;
3118 forced_delivery = f.deliver_force_thaw = TRUE;
3120 else if (Ustrcmp(argrest, "ar") == 0)
3122 msg_action = MSG_ADD_RECIPIENT;
3123 one_msg_action = TRUE;
3125 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3126 else if (Ustrcmp(argrest, "es") == 0)
3128 msg_action = MSG_EDIT_SENDER;
3129 one_msg_action = TRUE;
3131 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3132 else if (Ustrcmp(argrest, "g") == 0)
3134 msg_action = MSG_DELIVER;
3135 deliver_give_up = TRUE;
3137 else if (Ustrcmp(argrest, "G") == 0)
3139 msg_action = MSG_SETQUEUE;
3140 queue_name_dest = string_copy_taint(
3141 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3144 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3145 else if (Ustrcmp(argrest, "md") == 0)
3147 msg_action = MSG_MARK_DELIVERED;
3148 one_msg_action = TRUE;
3150 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3151 else if (Ustrcmp(argrest, "set") == 0)
3153 msg_action = MSG_LOAD;
3154 one_msg_action = TRUE;
3156 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3157 else if (Ustrcmp(argrest, "vb") == 0)
3159 msg_action = MSG_SHOW_BODY;
3160 one_msg_action = TRUE;
3162 else if (Ustrcmp(argrest, "vc") == 0)
3164 msg_action = MSG_SHOW_COPY;
3165 one_msg_action = TRUE;
3167 else if (Ustrcmp(argrest, "vh") == 0)
3169 msg_action = MSG_SHOW_HEADER;
3170 one_msg_action = TRUE;
3172 else if (Ustrcmp(argrest, "vl") == 0)
3174 msg_action = MSG_SHOW_LOG;
3175 one_msg_action = TRUE;
3177 else { badarg = TRUE; break; }
3179 /* All the -Mxx options require at least one message id. */
3181 msg_action_arg = i + 1;
3182 if (msg_action_arg >= argc)
3183 exim_fail("exim: no message ids given after %s option\n", arg);
3185 /* Some require only message ids to follow */
3187 if (!one_msg_action)
3189 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3190 exim_fail("exim: malformed message id %s after %s option\n",
3192 goto END_ARG; /* Remaining args are ids */
3195 /* Others require only one message id, possibly followed by addresses,
3196 which will be handled as normal arguments. */
3200 if (!mac_ismsgid(argv[msg_action_arg]))
3201 exim_fail("exim: malformed message id %s after %s option\n",
3202 argv[msg_action_arg], arg);
3208 /* Some programs seem to call the -om option without the leading o;
3209 for sendmail it askes for "me too". Exim always does this. */
3212 if (*argrest) badarg = TRUE;
3216 /* -N: don't do delivery - a debugging option that stops transports doing
3217 their thing. It implies debugging at the D_v level. */
3222 f.dont_deliver = TRUE;
3223 debug_selector |= D_v;
3224 debug_file = stderr;
3230 /* -n: This means "don't alias" in sendmail, apparently.
3231 For normal invocations, it has no effect.
3232 It may affect some other options. */
3238 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3239 option to the specified value. This form uses long names. We need to handle
3240 -O option=value and -Ooption=value. */
3245 exim_fail("exim: string expected after -O\n");
3251 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3254 if (!*(alias_arg = argrest))
3255 if (i+1 < argc) alias_arg = argv[++i];
3256 else exim_fail("exim: string expected after -oA\n");
3259 /* -oB: Set a connection message max value for remote deliveries */
3262 uschar * p = argrest;
3264 if (i+1 < argc && isdigit((argv[i+1][0])))
3268 connection_max_messages = 1;
3275 exim_fail("exim: number expected after -oB\n");
3276 connection_max_messages = Uatoi(p);
3281 /* -odb: background delivery */
3284 if (Ustrcmp(argrest, "b") == 0)
3286 f.synchronous_delivery = FALSE;
3287 arg_queue_only = FALSE;
3288 queue_only_set = TRUE;
3291 /* -odd: testsuite-only: add no inter-process delays */
3293 else if (Ustrcmp(argrest, "d") == 0)
3294 f.testsuite_delays = FALSE;
3296 /* -odf: foreground delivery (smail-compatible option); same effect as
3297 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3300 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3302 f.synchronous_delivery = TRUE;
3303 arg_queue_only = FALSE;
3304 queue_only_set = TRUE;
3307 /* -odq: queue only */
3309 else if (Ustrcmp(argrest, "q") == 0)
3311 f.synchronous_delivery = FALSE;
3312 arg_queue_only = TRUE;
3313 queue_only_set = TRUE;
3316 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3317 but no remote delivery */
3319 else if (Ustrcmp(argrest, "qs") == 0)
3321 f.queue_smtp = TRUE;
3322 arg_queue_only = FALSE;
3323 queue_only_set = TRUE;
3328 /* -oex: Sendmail error flags. As these are also accepted without the
3329 leading -o prefix, for compatibility with vacation and other callers,
3330 they are handled with -e above. */
3332 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3333 -oitrue: Another sendmail syntax for the same */
3336 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3341 /* -oM*: Set various characteristics for an incoming message; actually
3342 acted on for trusted callers only. */
3347 exim_fail("exim: data expected after -oM%s\n", argrest);
3349 /* -oMa: Set sender host address */
3351 if (Ustrcmp(argrest, "a") == 0)
3352 sender_host_address = string_copy_taint(
3353 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3356 /* -oMaa: Set authenticator name */
3358 else if (Ustrcmp(argrest, "aa") == 0)
3359 sender_host_authenticated = string_copy_taint(
3360 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3363 /* -oMas: setting authenticated sender */
3365 else if (Ustrcmp(argrest, "as") == 0)
3366 authenticated_sender = string_copy_taint(
3367 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3370 /* -oMai: setting authenticated id */
3372 else if (Ustrcmp(argrest, "ai") == 0)
3373 authenticated_id = string_copy_taint(
3374 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMai"),
3377 /* -oMi: Set incoming interface address */
3379 else if (Ustrcmp(argrest, "i") == 0)
3380 interface_address = string_copy_taint(
3381 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3384 /* -oMm: Message reference */
3386 else if (Ustrcmp(argrest, "m") == 0)
3388 if (!mac_ismsgid(argv[i+1]))
3389 exim_fail("-oMm must be a valid message ID\n");
3390 if (!f.trusted_config)
3391 exim_fail("-oMm must be called by a trusted user/config\n");
3392 message_reference = argv[++i];
3395 /* -oMr: Received protocol */
3397 else if (Ustrcmp(argrest, "r") == 0)
3399 if (received_protocol)
3400 exim_fail("received_protocol is set already\n");
3402 received_protocol = string_copy_taint(
3403 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3406 /* -oMs: Set sender host name */
3408 else if (Ustrcmp(argrest, "s") == 0)
3409 sender_host_name = string_copy_taint(
3410 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3413 /* -oMt: Set sender ident */
3415 else if (Ustrcmp(argrest, "t") == 0)
3417 sender_ident_set = TRUE;
3418 sender_ident = string_copy_taint(
3419 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3423 /* Else a bad argument */
3430 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3431 seem to call this as -m (undocumented), so that is also accepted (see
3433 /* -oo: An ancient flag for old-style addresses which still seems to
3434 crop up in some calls (see in SCO). */
3438 if (*argrest) badarg = TRUE;
3441 /* -oP <name>: set pid file path for daemon
3442 -oPX: delete pid file of daemon */
3445 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3446 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3447 "(uid=%d euid=%d | %d)\n",
3448 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3449 if (!*argrest) override_pid_file_path = argv[++i];
3450 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3455 /* -or <n>: set timeout for non-SMTP acceptance
3456 -os <n>: set timeout for SMTP acceptance */
3461 int * tp = argrest[-1] == 'r'
3462 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3464 *tp = readconf_readtime(argrest, 0, FALSE);
3465 else if (i+1 < argc)
3466 *tp = readconf_readtime(argv[++i], 0, FALSE);
3469 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3473 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3474 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3477 if (*argrest) badarg = TRUE;
3478 else override_local_interfaces = string_copy_taint(
3479 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3483 /* -oY: Override creation of daemon notifier socket */
3486 if (*argrest) badarg = TRUE;
3487 else f.notifier_socket_en = FALSE;
3490 /* Unknown -o argument */
3498 /* -ps: force Perl startup; -pd force delayed Perl startup */
3502 if (*argrest == 's' && argrest[1] == 0)
3504 perl_start_option = 1;
3507 if (*argrest == 'd' && argrest[1] == 0)
3509 perl_start_option = -1;
3514 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3515 which sets the host protocol and host name */
3518 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3522 uschar * hn = Ustrchr(argrest, ':');
3524 if (received_protocol)
3525 exim_fail("received_protocol is set already\n");
3528 received_protocol = string_copy_taint(
3529 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3533 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3534 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3535 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3540 /* -q: set up queue runs */
3544 BOOL two_stage, first_del, force, thaw = FALSE, local;
3546 receiving_message = FALSE;
3548 /* -qq...: Do queue runs in a 2-stage manner */
3550 if ((two_stage = *argrest == 'q'))
3553 /* -qi...: Do only first (initial) deliveries */
3555 if ((first_del = *argrest == 'i'))
3558 /* -qf...: Run the queue, forcing deliveries
3559 -qff..: Ditto, forcing thawing as well */
3561 if ((force = *argrest == 'f'))
3562 if ((thaw = *++argrest == 'f'))
3565 /* -q[f][f]l...: Run the queue only on local deliveries */
3567 if ((local = *argrest == 'l'))
3570 /* -q[f][f][l][G<name>]... Work on the named queue */
3572 if (*argrest == 'G')
3575 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3576 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3577 queue_name = string_copyn(argrest, i);
3579 if (*argrest == '/') argrest++;
3582 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3583 only, optionally named, optionally starting from a given message id. */
3585 if (!(list_queue || count_queue))
3590 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3592 q = alloc_onetime_qrunner();
3593 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3594 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3595 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3596 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3599 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3600 forced, optionally local only, optionally named. */
3604 int intvl = readconf_readtime(*argrest ? argrest : argv[++i], 0, FALSE);
3606 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3608 for (qrunner * qq = qrunners; qq; qq = qq->next)
3609 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3610 || !queue_name && !qq->name)
3611 exim_fail("exim: queue-runner specified more than once\n");
3613 q = alloc_qrunner();
3614 q->interval = intvl;
3617 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3618 q->queue_run_force = force;
3619 q->deliver_force_thaw = thaw;
3620 q->queue_run_first_delivery = first_del;
3621 q->queue_run_local = local;
3622 q->queue_2stage = two_stage;
3629 case 'R': /* Synonymous with -qR... */
3630 case 'S': /* Synonymous with -qS... */
3632 const uschar * tainted_selectstr;
3635 receiving_message = FALSE;
3637 /* -Rf: As -R (below) but force all deliveries,
3638 -Rff: Ditto, but also thaw all frozen messages,
3639 -Rr: String is regex
3640 -Rrf: Regex and force
3641 -Rrff: Regex and force and thaw
3643 -S...: Like -R but works on sender.
3645 in all cases provided there are no further characters in this
3648 alloc_onetime_qrunner();
3649 qrunners->queue_2stage = f.queue_2stage;
3651 for (int i = 0; i < nelem(rsopts); i++)
3652 if (Ustrcmp(argrest, rsopts[i]) == 0)
3654 if (i != 2) qrunners->queue_run_force = TRUE;
3656 if (switchchar == 'R')
3657 f.deliver_selectstring_regex = TRUE;
3659 f.deliver_selectstring_sender_regex = TRUE;
3660 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3661 argrest += Ustrlen(rsopts[i]);
3664 /* -R or -S: Set string to match in addresses for forced queue run to
3665 pick out particular messages. */
3667 /* Avoid attacks from people providing very long strings, and do so before
3670 tainted_selectstr = argrest;
3671 else if (i+1 < argc)
3672 tainted_selectstr = argv[++i];
3674 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3676 s = string_copy_taint(
3677 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3680 if (switchchar == 'R')
3681 deliver_selectstring = s;
3683 deliver_selectstring_sender = s;
3688 /* -r: an obsolete synonym for -f (see above) */
3690 /* -Tqt is an option that is exclusively for use by the testing suite.
3691 It is not recognized in other circumstances. It allows for the setting up
3692 of explicit "queue times" so that various warning/retry things can be
3693 tested. Otherwise variability of clock ticks etc. cause problems. */
3696 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3697 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3702 /* -t: Set flag to extract recipients from body of message. */
3705 if (!*argrest) extract_recipients = TRUE;
3707 /* -ti: Set flag to extract recipients from body of message, and also
3708 specify that dot does not end the message. */
3710 else if (Ustrcmp(argrest, "i") == 0)
3712 extract_recipients = TRUE;
3716 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3719 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3726 /* -U: This means "initial user submission" in sendmail, apparently. The
3727 doc claims that in future sendmail may refuse syntactically invalid
3728 messages instead of fixing them. For the moment, we just ignore it. */
3734 /* -v: verify things - this is a very low-level debugging */
3739 debug_selector |= D_v;
3740 debug_file = stderr;
3746 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3748 The -x flag tells the sendmail command that mail from a local
3749 mail program has National Language Support (NLS) extended characters
3750 in the body of the mail item. The sendmail command can send mail with
3751 extended NLS characters across networks that normally corrupts these
3754 As Exim is 8-bit clean, it just ignores this flag. */
3757 if (*argrest) badarg = TRUE;
3760 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3761 logs to that file. We swallow the parameter and otherwise ignore it. */
3766 exim_fail("exim: string expected after -X\n");
3769 /* -z: a line of text to log */
3774 log_oneline = string_copy_taint(
3775 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3778 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3781 /* All other initial characters are errors */
3786 } /* End of high-level switch statement */
3788 /* Failed to recognize the option, or syntax error */
3791 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3792 "option %s\n", arg);
3796 /* If -R or -S have been specified without -q, assume a single queue run. */
3798 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3799 alloc_onetime_qrunner();
3803 store_pool = old_pool;
3806 /* If usage_wanted is set we call the usage function - which never returns */
3807 if (usage_wanted) exim_usage(called_as);
3809 /* Arguments have been processed. Check for incompatibilities. */
3810 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3811 && ( f.daemon_listen || qrunners || bi_option
3812 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3813 || filter_test != FTEST_NONE
3814 || msg_action_arg > 0 && !one_msg_action
3816 || ( msg_action_arg > 0
3817 && ( f.daemon_listen || is_multiple_qrun() || list_options
3818 || checking && msg_action != MSG_LOAD
3819 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3821 || ( (f.daemon_listen || is_multiple_qrun())
3822 && ( sender_address || list_options || list_queue || checking
3825 || f.daemon_listen && is_onetime_qrun()
3826 || f.inetd_wait_mode && qrunners
3828 && ( checking || smtp_input || extract_recipients
3829 || filter_test != FTEST_NONE || bi_option
3831 || ( verify_address_mode
3832 && ( f.address_test_mode || smtp_input || extract_recipients
3833 || filter_test != FTEST_NONE || bi_option
3835 || ( f.address_test_mode
3836 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3840 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3842 || deliver_selectstring && !qrunners
3843 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3845 exim_fail("exim: incompatible command-line options or arguments\n");
3847 /* If debugging is set up, set the file and the file descriptor to pass on to
3848 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3849 to run in the foreground. */
3851 if (debug_selector != 0)
3853 debug_file = stderr;
3854 debug_fd = fileno(debug_file);
3855 f.background_daemon = FALSE;
3856 testharness_pause_ms(100); /* lets caller finish */
3857 if (debug_selector != D_v) /* -v only doesn't show this */
3859 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3860 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3862 if (!version_printed)
3863 show_whats_supported(FALSE);
3867 /* When started with root privilege, ensure that the limits on the number of
3868 open files and the number of processes (where that is accessible) are
3869 sufficiently large, or are unset, in case Exim has been called from an
3870 environment where the limits are screwed down. Not all OS have the ability to
3871 change some of these limits. */
3875 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3881 #ifdef RLIMIT_NOFILE
3882 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3884 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3886 rlp.rlim_cur = rlp.rlim_max = 0;
3889 /* I originally chose 1000 as a nice big number that was unlikely to
3890 be exceeded. It turns out that some older OS have a fixed upper limit of
3893 if (rlp.rlim_cur < 1000)
3895 rlp.rlim_cur = rlp.rlim_max = 1000;
3896 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3898 rlp.rlim_cur = rlp.rlim_max = 256;
3899 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3900 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3907 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3909 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3911 rlp.rlim_cur = rlp.rlim_max = 0;
3914 # ifdef RLIM_INFINITY
3915 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3917 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3919 if (rlp.rlim_cur < 1000)
3921 rlp.rlim_cur = rlp.rlim_max = 1000;
3923 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3924 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3930 /* Exim is normally entered as root (but some special configurations are
3931 possible that don't do this). However, it always spins off sub-processes that
3932 set their uid and gid as required for local delivery. We don't want to pass on
3933 any extra groups that root may belong to, so we want to get rid of them all at
3936 We need to obey setgroups() at this stage, before possibly giving up root
3937 privilege for a changed configuration file, but later on we might need to
3938 check on the additional groups for the admin user privilege - can't do that
3939 till after reading the config, which might specify the exim gid. Therefore,
3940 save the group list here first. */
3942 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3943 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3945 /* There is a fundamental difference in some BSD systems in the matter of
3946 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3947 known not to be different. On the "different" systems there is a single group
3948 list, and the first entry in it is the current group. On all other versions of
3949 Unix there is a supplementary group list, which is in *addition* to the current
3950 group. Consequently, to get rid of all extraneous groups on a "standard" system
3951 you pass over 0 groups to setgroups(), while on a "different" system you pass
3952 over a single group - the current group, which is always the first group in the
3953 list. Calling setgroups() with zero groups on a "different" system results in
3954 an error return. The following code should cope with both types of system.
3956 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3957 the "setgroups() with zero groups" - and changes the egid.
3958 Thanks to that we had to stash the original_egid above, for use below
3959 in the call to exim_setugid().
3961 However, if this process isn't running as root, setgroups() can't be used
3962 since you have to be root to run it, even if throwing away groups.
3963 Except, sigh, for Hurd - where you can.
3964 Not being root here happens only in some unusual configurations. */
3967 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3968 && setgroups(0, NULL) != 0
3970 && setgroups(1, group_list) != 0)
3971 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3973 /* If the configuration file name has been altered by an argument on the
3974 command line (either a new file name or a macro definition) and the caller is
3975 not root, or if this is a filter testing run, remove any setuid privilege the
3976 program has and run as the underlying user.
3978 The exim user is locked out of this, which severely restricts the use of -C
3981 Otherwise, set the real ids to the effective values (should be root unless run
3982 from inetd, which it can either be root or the exim uid, if one is configured).
3984 There is a private mechanism for bypassing some of this, in order to make it
3985 possible to test lots of configurations automatically, without having either to
3986 recompile each time, or to patch in an actual configuration file name and other
3987 values (such as the path name). If running in the test harness, pretend that
3988 configuration file changes and macro definitions haven't happened. */
3991 (!f.trusted_config || /* Config changed, or */
3992 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3993 real_uid != root_uid && /* Not root, and */
3994 !f.running_in_test_harness /* Not fudged */
3996 expansion_test /* expansion testing */
3998 filter_test != FTEST_NONE) /* Filter testing */
4000 setgroups(group_count, group_list);
4001 exim_setugid(real_uid, real_gid, FALSE,
4002 US"-C, -D, -be or -bf forces real uid");
4003 removed_privilege = TRUE;
4005 /* In the normal case when Exim is called like this, stderr is available
4006 and should be used for any logging information because attempts to write
4007 to the log will usually fail. To arrange this, we unset really_exim. However,
4008 if no stderr is available there is no point - we might as well have a go
4009 at the log (if it fails, syslog will be written).
4011 Note that if the invoker is Exim, the logs remain available. Messing with
4012 this causes unlogged successful deliveries. */
4014 if (log_stderr && real_uid != exim_uid)
4015 f.really_exim = FALSE;
4018 /* Privilege is to be retained for the moment. It may be dropped later,
4019 depending on the job that this Exim process has been asked to do. For now, set
4020 the real uid to the effective so that subsequent re-execs of Exim are done by a
4024 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4026 /* If testing a filter, open the file(s) now, before wasting time doing other
4027 setups and reading the message. */
4029 if (filter_test & FTEST_SYSTEM)
4030 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4031 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4034 if (filter_test & FTEST_USER)
4035 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4036 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4039 /* Initialise lookup_list
4040 If debugging, already called above via version reporting.
4041 In either case, we initialise the list of available lookups while running
4042 as root. All dynamically modules are loaded from a directory which is
4043 hard-coded into the binary and is code which, if not a module, would be
4044 part of Exim already. Ability to modify the content of the directory
4045 is equivalent to the ability to modify a setuid binary!
4047 This needs to happen before we read the main configuration. */
4050 /*XXX this excrescence could move to the testsuite standard config setup file */
4052 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4055 /* Read the main runtime configuration data; this gives up if there
4056 is a failure. It leaves the configuration file open so that the subsequent
4057 configuration data for delivery can be read if needed.
4059 NOTE: immediately after opening the configuration file we change the working
4060 directory to "/"! Later we change to $spool_directory. We do it there, because
4061 during readconf_main() some expansion takes place already. */
4063 /* Store the initial cwd before we change directories. Can be NULL if the
4064 dir has already been unlinked. */
4065 initial_cwd = os_getcwd(NULL, 0);
4066 if (!initial_cwd && errno)
4067 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4069 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4070 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4073 -be[m] expansion test -
4074 -b[fF] filter test new
4076 -bmalware malware_test_file new
4078 -brw rewrite test new
4080 -bv[s] address verify -
4082 -bP <option> (except -bP config, which sets list_config)
4084 If any of these options is set, we suppress warnings about configuration
4085 issues (currently about tls_advertise_hosts and keep_environment not being
4089 int old_pool = store_pool;
4090 #ifdef MEASURE_TIMING
4092 (void)gettimeofday(&t0, NULL);
4095 store_pool = POOL_CONFIG;
4096 readconf_main(checking || list_options);
4097 store_pool = old_pool;
4099 #ifdef MEASURE_TIMING
4100 report_time_since(&t0, US"readconf_main (delta)");
4104 /* Now in directory "/" */
4106 if (cleanup_environment() == FALSE)
4107 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4110 /* If an action on specific messages is requested, or if a daemon or queue
4111 runner is being started, we need to know if Exim was called by an admin user.
4112 This is the case if the real user is root or exim, or if the real group is
4113 exim, or if one of the supplementary groups is exim or a group listed in
4114 admin_groups. We don't fail all message actions immediately if not admin_user,
4115 since some actions can be performed by non-admin users. Instead, set admin_user
4116 for later interrogation. */
4118 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4119 f.admin_user = TRUE;
4121 for (int i = 0; i < group_count && !f.admin_user; i++)
4122 if (group_list[i] == exim_gid)
4123 f.admin_user = TRUE;
4124 else if (admin_groups)
4125 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4126 if (admin_groups[j] == group_list[i])
4127 f.admin_user = TRUE;
4129 /* Another group of privileged users are the trusted users. These are root,
4130 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4131 are permitted to specify sender_addresses with -f on the command line, and
4132 other message parameters as well. */
4134 if (real_uid == root_uid || real_uid == exim_uid)
4135 f.trusted_caller = TRUE;
4139 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4140 if (trusted_users[i] == real_uid)
4141 f.trusted_caller = TRUE;
4144 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4145 if (trusted_groups[i] == real_gid)
4146 f.trusted_caller = TRUE;
4147 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4148 if (trusted_groups[i] == group_list[j])
4149 f.trusted_caller = TRUE;
4152 /* At this point, we know if the user is privileged and some command-line
4153 options become possibly impermissible, depending upon the configuration file. */
4155 if (checking && commandline_checks_require_admin && !f.admin_user)
4156 exim_fail("exim: those command-line flags are set to require admin\n");
4158 /* Handle the decoding of logging options. */
4160 decode_bits(log_selector, log_selector_size, log_notall,
4161 log_selector_string, log_options, log_options_count, US"log", 0);
4165 debug_printf("configuration file is %s\n", config_main_filename);
4166 debug_printf("log selectors =");
4167 for (int i = 0; i < log_selector_size; i++)
4168 debug_printf(" %08x", log_selector[i]);
4172 /* If domain literals are not allowed, check the sender address that was
4173 supplied with -f. Ditto for a stripped trailing dot. */
4177 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4178 exim_fail("exim: bad -f address \"%s\": domain literals not "
4179 "allowed\n", sender_address);
4180 if (f_end_dot && !strip_trailing_dot)
4181 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4182 "(trailing dot not allowed)\n", sender_address);
4185 /* See if an admin user overrode our logging. */
4187 if (cmdline_syslog_name)
4190 syslog_processname = cmdline_syslog_name;
4191 log_file_path = string_copy(CUS"syslog");
4194 /* not a panic, non-privileged users should not be able to spam paniclog */
4196 "exim: you lack sufficient privilege to specify syslog process name\n");
4198 /* Paranoia check of maximum lengths of certain strings. There is a check
4199 on the length of the log file path in log.c, which will come into effect
4200 if there are any calls to write the log earlier than this. However, if we
4201 get this far but the string is very long, it is better to stop now than to
4202 carry on and (e.g.) receive a message and then have to collapse. The call to
4203 log_write() from here will cause the ultimate panic collapse if the complete
4204 file name exceeds the buffer length. */
4206 if (Ustrlen(log_file_path) > 200)
4207 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4208 "log_file_path is longer than 200 chars: aborting");
4210 if (Ustrlen(pid_file_path) > 200)
4211 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4212 "pid_file_path is longer than 200 chars: aborting");
4214 if (Ustrlen(spool_directory) > 200)
4215 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4216 "spool_directory is longer than 200 chars: aborting");
4218 /* Length check on the process name given to syslog for its TAG field,
4219 which is only permitted to be 32 characters or less. See RFC 3164. */
4221 if (Ustrlen(syslog_processname) > 32)
4222 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4223 "syslog_processname is longer than 32 chars: aborting");
4228 log_write(0, LOG_MAIN, "%s", log_oneline);
4229 return EXIT_SUCCESS;
4232 return EXIT_FAILURE;
4234 /* In some operating systems, the environment variable TMPDIR controls where
4235 temporary files are created; Exim doesn't use these (apart from when delivering
4236 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4237 If TMPDIR is found in the environment, reset it to the value defined in the
4238 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4239 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4240 EXIM_TMPDIR by the build scripts.
4244 if (environ) for (uschar ** p = USS environ; *p; p++)
4245 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4247 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4248 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4250 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4254 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4255 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4256 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4257 called by a user who has set the TZ variable. This then affects the timestamps
4258 in log files and in Received: headers, and any created Date: header lines. The
4259 required timezone is settable in the configuration file, so nothing can be done
4260 about this earlier - but hopefully nothing will normally be logged earlier than
4261 this. We have to make a new environment if TZ is wrong, but don't bother if
4262 timestamps_utc is set, because then all times are in UTC anyway. */
4264 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4265 f.timestamps_utc = TRUE;
4268 uschar *envtz = US getenv("TZ");
4270 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4271 : timezone_string != NULL
4274 uschar **p = USS environ;
4278 if (environ) while (*p++) count++;
4279 if (!envtz) count++;
4280 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4281 if (environ) for (p = USS environ; *p; p++)
4282 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4283 if (timezone_string)
4285 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4286 sprintf(CS *newp++, "TZ=%s", timezone_string);
4291 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4292 tod_stamp(tod_log));
4296 /* Handle the case when we have removed the setuid privilege because of -C or
4297 -D. This means that the caller of Exim was not root.
4299 There is a problem if we were running as the Exim user. The sysadmin may
4300 expect this case to retain privilege because "the binary was called by the
4301 Exim user", but it hasn't, because either the -D option set macros, or the
4302 -C option set a non-trusted configuration file. There are two possibilities:
4304 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4305 to do message deliveries. Thus, the fact that it is running as a
4306 non-privileged user is plausible, and might be wanted in some special
4307 configurations. However, really_exim will have been set false when
4308 privilege was dropped, to stop Exim trying to write to its normal log
4309 files. Therefore, re-enable normal log processing, assuming the sysadmin
4310 has set up the log directory correctly.
4312 (2) If deliver_drop_privilege is not set, the configuration won't work as
4313 apparently intended, and so we log a panic message. In order to retain
4314 root for -C or -D, the caller must either be root or be invoking a
4315 trusted configuration file (when deliver_drop_privilege is false). */
4317 if ( removed_privilege
4318 && (!f.trusted_config || opt_D_used)
4319 && real_uid == exim_uid)
4320 if (deliver_drop_privilege)
4321 f.really_exim = TRUE; /* let logging work normally */
4323 log_write(0, LOG_MAIN|LOG_PANIC,
4324 "exim user lost privilege for using %s option",
4325 f.trusted_config? "-D" : "-C");
4327 /* Start up Perl interpreter if Perl support is configured and there is a
4328 perl_startup option, and the configuration or the command line specifies
4329 initializing starting. Note that the global variables are actually called
4330 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4333 if (perl_start_option != 0)
4334 opt_perl_at_start = (perl_start_option > 0);
4335 if (opt_perl_at_start && opt_perl_startup != NULL)
4338 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4339 if ((errstr = init_perl(opt_perl_startup)))
4340 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4341 opt_perl_started = TRUE;
4343 #endif /* EXIM_PERL */
4345 /* Log the arguments of the call if the configuration file said so. This is
4346 a debugging feature for finding out what arguments certain MUAs actually use.
4347 Don't attempt it if logging is disabled, or if listing variables or if
4348 verifying/testing addresses or expansions. */
4350 if ( (debug_selector & D_any || LOGGING(arguments))
4351 && f.really_exim && !list_options && !checking)
4353 uschar *p = big_buffer;
4354 Ustrcpy(p, US"cwd= (failed)");
4361 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4362 p += Ustrlen(CCS p);
4365 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4367 for (int i = 0; i < argc; i++)
4369 int len = Ustrlen(argv[i]);
4370 const uschar *printing;
4372 if (p + len + 8 >= big_buffer + big_buffer_size)
4374 Ustrcpy(p, US" ...");
4375 log_write(0, LOG_MAIN, "%s", big_buffer);
4376 Ustrcpy(big_buffer, US"...");
4379 printing = string_printing(argv[i]);
4380 if (!*printing) quote = US"\"";
4383 const uschar *pp = printing;
4385 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4387 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4388 (p - big_buffer) - 4), printing, quote);
4391 if (LOGGING(arguments))
4392 log_write(0, LOG_MAIN, "%s", big_buffer);
4394 debug_printf("%s\n", big_buffer);
4397 /* Set the working directory to be the top-level spool directory. We don't rely
4398 on this in the code, which always uses fully qualified names, but it's useful
4399 for core dumps etc. Don't complain if it fails - the spool directory might not
4400 be generally accessible and calls with the -C option (and others) have lost
4401 privilege by now. Before the chdir, we try to ensure that the directory exists.
4404 if (Uchdir(spool_directory) != 0)
4406 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4407 (void) Uchdir(spool_directory);
4410 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4411 alias file. Exim doesn't have such a concept, but this call is screwed into
4412 Sun's YP makefiles. Handle this by calling a configured script, as the real
4413 user who called Exim. The -oA option can be used to pass an argument to the
4418 (void) fclose(config_file);
4419 if (bi_command && *bi_command)
4423 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4424 if (alias_arg) argv[i++] = alias_arg;
4427 setgroups(group_count, group_list);
4428 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4430 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4431 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4433 execv(CS argv[0], (char *const *)argv);
4434 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4438 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4443 /* We moved the admin/trusted check to be immediately after reading the
4444 configuration file. We leave these prints here to ensure that syslog setup,
4445 logfile setup, and so on has already happened. */
4447 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4448 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4450 /* Only an admin user may start the daemon or force a queue run in the default
4451 configuration, but the queue run restriction can be relaxed. Only an admin
4452 user may request that a message be returned to its sender forthwith. Only an
4453 admin user may specify a debug level greater than D_v (because it might show
4454 passwords, etc. in lookup queries). Only an admin user may request a queue
4455 count. Only an admin user can use the test interface to scan for email
4456 (because Exim will be in the spool dir and able to look at mails). */
4460 BOOL debugset = (debug_selector & ~D_v) != 0;
4461 if ( deliver_give_up || f.daemon_listen || malware_test_file
4462 || count_queue && queue_list_requires_admin
4463 || list_queue && queue_list_requires_admin
4464 || qrunners && prod_requires_admin
4465 || queue_name_dest && prod_requires_admin
4466 || debugset && !f.running_in_test_harness
4468 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4471 /* If the real user is not root or the exim uid, the argument for passing
4472 in an open TCP/IP connection for another message is not permitted, nor is
4473 running with the -N option for any delivery action, unless this call to exim is
4474 one that supplied an input message, or we are using a patched exim for
4475 regression testing. */
4477 if ( real_uid != root_uid && real_uid != exim_uid
4478 && ( continue_hostname
4480 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4482 && !f.running_in_test_harness
4484 exim_fail("exim: Permission denied\n");
4486 /* If the caller is not trusted, certain arguments are ignored when running for
4487 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4488 Note that authority for performing certain actions on messages is tested in the
4489 queue_action() function. */
4491 if (!f.trusted_caller && !checking)
4493 sender_host_name = sender_host_address = interface_address =
4494 sender_ident = received_protocol = NULL;
4495 sender_host_port = interface_port = 0;
4496 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4499 /* If a sender host address is set, extract the optional port number off the
4500 end of it and check its syntax. Do the same thing for the interface address.
4501 Exim exits if the syntax is bad. */
4505 if (sender_host_address)
4506 sender_host_port = check_port(sender_host_address);
4507 if (interface_address)
4508 interface_port = check_port(interface_address);
4511 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4514 if (f.trusted_caller)
4516 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4517 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4520 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4523 /* If an SMTP message is being received check to see if the standard input is a
4524 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4525 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4530 union sockaddr_46 inetd_sock;
4531 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4532 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4534 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4535 if (family == AF_INET || family == AF_INET6)
4537 union sockaddr_46 interface_sock;
4538 size = sizeof(interface_sock);
4540 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4541 interface_address = host_ntoa(-1, &interface_sock, NULL,
4544 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4546 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4549 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4550 NULL, &sender_host_port);
4551 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4552 "inetd is not supported when mua_wrapper is set");
4556 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4561 /* If the load average is going to be needed while receiving a message, get it
4562 now for those OS that require the first call to os_getloadavg() to be done as
4563 root. There will be further calls later for each message received. */
4565 #ifdef LOAD_AVG_NEEDS_ROOT
4566 if ( receiving_message
4567 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4568 load_average = OS_GETLOADAVG();
4571 /* The queue_only configuration option can be overridden by -odx on the command
4572 line, except that if queue_only_override is false, queue_only cannot be unset
4573 from the command line. */
4575 if (queue_only_set && (queue_only_override || arg_queue_only))
4576 queue_only = arg_queue_only;
4578 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4581 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4582 if (arg_smtp_receive_timeout >= 0)
4583 smtp_receive_timeout = arg_smtp_receive_timeout;
4585 /* If Exim was started with root privilege, unless we have already removed the
4586 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4587 except when starting the daemon or doing some kind of delivery or address
4588 testing (-bt). These are the only cases when root need to be retained. We run
4589 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4590 retained only for starting the daemon. We always do the initgroups() in this
4591 situation (controlled by the TRUE below), in order to be as close as possible
4592 to the state Exim usually runs in. */
4594 if ( !unprivileged /* originally had root AND */
4595 && !removed_privilege /* still got root AND */
4596 && !f.daemon_listen /* not starting the daemon */
4597 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4598 && ( /* AND EITHER */
4599 deliver_drop_privilege /* requested unprivileged */
4601 !qrunners /* not running the queue */
4602 && ( msg_action_arg < 0 /* and */
4603 || msg_action != MSG_DELIVER /* not delivering */
4605 && (!checking || !f.address_test_mode) /* not address checking */
4606 && !rcpt_verify_quota /* and not quota checking */
4608 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4610 /* When we are retaining a privileged uid, we still change to the exim gid. */
4615 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4616 rv = setgid(exim_gid);
4617 /* Impact of failure is that some stuff might end up with an incorrect group.
4618 We track this for failures from root, since any attempt to change privilege
4619 by root should succeed and failures should be examined. For non-root,
4620 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4621 no need to complain then. */
4623 if (!(unprivileged || removed_privilege))
4624 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4627 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4628 (long int)exim_gid, strerror(errno));
4632 /* Handle a request to scan a file for malware */
4633 if (malware_test_file)
4635 #ifdef WITH_CONTENT_SCAN
4637 set_process_info("scanning file for malware");
4638 if ((result = malware_in_file(malware_test_file)) == FAIL)
4640 printf("No malware found.\n");
4645 printf("Malware lookup returned non-okay/fail: %d\n", result);
4649 printf("Malware found: %s\n", malware_name);
4651 printf("Malware scan detected malware of unknown name.\n");
4653 printf("Malware scanning not enabled at compile time.\n");
4658 /* Handle a request to list the delivery queue */
4662 set_process_info("listing the queue");
4663 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4667 /* Handle a request to count the delivery queue */
4671 set_process_info("counting the queue");
4672 fprintf(stdout, "%u\n", queue_count());
4676 /* Handle actions on specific messages, except for the force delivery and
4677 message load actions, which are done below. Some actions take a whole list of
4678 message ids, which are known to continue up to the end of the arguments. Others
4679 take a single message id and then operate on the recipients list. */
4681 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4683 int yield = EXIT_SUCCESS;
4684 set_process_info("acting on specified messages");
4686 /* ACL definitions may be needed when removing a message (-Mrm) because
4687 event_action gets expanded */
4689 if (msg_action == MSG_REMOVE)
4691 int old_pool = store_pool;
4692 store_pool = POOL_CONFIG;
4694 store_pool = old_pool;
4695 store_writeprotect(POOL_CONFIG);
4698 if (!one_msg_action)
4700 for (i = msg_action_arg; i < argc; i++)
4701 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4702 yield = EXIT_FAILURE;
4705 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4706 default: printf("\n"); break;
4710 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4711 recipients_arg)) yield = EXIT_FAILURE;
4715 /* We used to set up here to skip reading the ACL section, on
4716 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4717 Now, since the intro of the ${acl } expansion, ACL definitions may be
4718 needed in transports so we lost the optimisation. */
4721 int old_pool = store_pool;
4722 #ifdef MEASURE_TIMING
4724 (void)gettimeofday(&t0, NULL);
4727 store_pool = POOL_CONFIG;
4729 store_pool = old_pool;
4731 /* -be can add macro definitions, needing to link to the macro structure
4732 chain. Otherwise, make the memory used for config data readonly. */
4734 if (!expansion_test)
4735 store_writeprotect(POOL_CONFIG);
4737 #ifdef MEASURE_TIMING
4738 report_time_since(&t0, US"readconf_rest (delta)");
4742 /* Handle a request to check quota */
4743 if (rcpt_verify_quota)
4744 if (real_uid != root_uid && real_uid != exim_uid)
4745 exim_fail("exim: Permission denied\n");
4746 else if (recipients_arg >= argc)
4747 exim_fail("exim: missing recipient for quota check\n");
4750 verify_quota(argv[recipients_arg]);
4751 exim_exit(EXIT_SUCCESS);
4754 /* Handle the -brt option. This is for checking out retry configurations.
4755 The next three arguments are a domain name or a complete address, and
4756 optionally two error numbers. All it does is to call the function that
4757 scans the retry configuration data. */
4759 if (test_retry_arg >= 0)
4761 retry_config *yield;
4762 int basic_errno = 0;
4764 const uschar *s1, *s2;
4766 if (test_retry_arg >= argc)
4768 printf("-brt needs a domain or address argument\n");
4769 exim_exit(EXIT_FAILURE);
4771 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4774 /* If the first argument contains no @ and no . it might be a local user
4775 or it might be a single-component name. Treat as a domain. */
4777 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4779 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4780 "being \ntreated as a one-component domain, not as a local part.\n\n",
4784 /* There may be an optional second domain arg. */
4786 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4787 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4789 /* The final arg is an error name */
4791 if (test_retry_arg < argc)
4793 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4795 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4798 printf("%s\n", CS error);
4799 return EXIT_FAILURE;
4802 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4803 code > 100 as an error is for matching codes to the decade. Turn them into
4804 a real error code, off the decade. */
4806 if (basic_errno == ERRNO_MAIL4XX ||
4807 basic_errno == ERRNO_RCPT4XX ||
4808 basic_errno == ERRNO_DATA4XX)
4810 int code = (more_errno >> 8) & 255;
4812 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4813 else if (code > 100)
4814 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4818 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4819 printf("No retry information found\n");
4822 more_errno = yield->more_errno;
4823 printf("Retry rule: %s ", yield->pattern);
4825 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4827 printf("quota%s%s ",
4828 (more_errno > 0)? "_" : "",
4829 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4831 else if (yield->basic_errno == ECONNREFUSED)
4833 printf("refused%s%s ",
4834 (more_errno > 0)? "_" : "",
4835 (more_errno == 'M')? "MX" :
4836 (more_errno == 'A')? "A" : "");
4838 else if (yield->basic_errno == ETIMEDOUT)
4841 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4843 if (more_errno != 0) printf("_%s",
4844 (more_errno == 'M')? "MX" : "A");
4847 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4848 printf("auth_failed ");
4851 for (retry_rule * r = yield->rules; r; r = r->next)
4853 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4854 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4860 printf(",%d.", x/1000);
4874 exim_exit(EXIT_SUCCESS);
4877 /* Handle a request to list one or more configuration options */
4878 /* If -n was set, we suppress some information */
4883 set_process_info("listing variables");
4884 if (recipients_arg >= argc)
4885 fail = !readconf_print(US"all", NULL, flag_n);
4886 else for (i = recipients_arg; i < argc; i++)
4889 (Ustrcmp(argv[i], "router") == 0 ||
4890 Ustrcmp(argv[i], "transport") == 0 ||
4891 Ustrcmp(argv[i], "authenticator") == 0 ||
4892 Ustrcmp(argv[i], "macro") == 0 ||
4893 Ustrcmp(argv[i], "environment") == 0))
4895 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4899 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4901 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4906 set_process_info("listing config");
4907 exim_exit(readconf_print(US"config", NULL, flag_n)
4908 ? EXIT_SUCCESS : EXIT_FAILURE);
4912 /* Initialise subsystems as required. */
4916 /* Handle a request to deliver one or more messages that are already on the
4917 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4918 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4920 Delivery of specific messages is typically used for a small number when
4921 prodding by hand (when the option forced_delivery will be set) or when
4922 re-execing to regain root privilege. Each message delivery must happen in a
4923 separate process, so we fork a process for each one, and run them sequentially
4924 so that debugging output doesn't get intertwined, and to avoid spawning too
4925 many processes if a long list is given. However, don't fork for the last one;
4926 this saves a process in the common case when Exim is called to deliver just one
4929 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4931 if (prod_requires_admin && !f.admin_user)
4933 fprintf(stderr, "exim: Permission denied\n");
4934 exim_exit(EXIT_FAILURE);
4936 set_process_info("delivering specified messages");
4937 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4938 for (i = msg_action_arg; i < argc; i++)
4942 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4943 that runs into a later copy into the untainted global message_id[] */
4944 /*XXX Do we need a length limit check here? */
4946 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4947 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4949 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4950 exim_underbar_exit(EXIT_SUCCESS);
4954 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4956 exim_exit(EXIT_FAILURE);
4960 exim_exit(EXIT_SUCCESS);
4964 /* If only a single queue run is requested, without SMTP listening, we can just
4965 turn into a queue runner, with an optional starting message id. */
4967 if (is_onetime_qrun() && !f.daemon_listen)
4969 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
4970 exim_exit(EXIT_SUCCESS);
4974 /* Find the login name of the real user running this process. This is always
4975 needed when receiving a message, because it is written into the spool file. It
4976 may also be used to construct a from: or a sender: header, and in this case we
4977 need the user's full name as well, so save a copy of it, checked for RFC822
4978 syntax and munged if necessary, if it hasn't previously been set by the -F
4979 argument. We may try to get the passwd entry more than once, in case NIS or
4980 other delays are in evidence. Save the home directory for use in filter testing
4985 if ((pw = getpwuid(real_uid)) != NULL)
4987 originator_login = string_copy(US pw->pw_name);
4988 originator_home = string_copy(US pw->pw_dir);
4990 /* If user name has not been set by -F, set it from the passwd entry
4991 unless -f has been used to set the sender address by a trusted user. */
4993 if (!originator_name)
4995 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4997 uschar *name = US pw->pw_gecos;
4998 uschar *amp = Ustrchr(name, '&');
5001 /* Most Unix specify that a '&' character in the gecos field is
5002 replaced by a copy of the login name, and some even specify that
5003 the first character should be upper cased, so that's what we do. */
5008 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5009 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5010 buffer[loffset] = toupper(buffer[loffset]);
5014 /* If a pattern for matching the gecos field was supplied, apply
5015 it and then expand the name string. */
5017 if (gecos_pattern && gecos_name)
5019 const pcre2_code *re;
5020 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5022 if (regex_match_and_setup(re, name, 0, -1))
5024 uschar *new_name = expand_string(gecos_name);
5028 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5029 "gecos field \"%s\"\n", new_name, name);
5032 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5033 "\"%s\": %s\n", gecos_name, expand_string_message);
5035 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5036 "gecos field \"%s\"\n", gecos_pattern, name);
5037 store_free((void *)re);
5039 originator_name = string_copy(name);
5042 /* A trusted caller has used -f but not -F */
5044 else originator_name = US"";
5047 /* Break the retry loop */
5052 if (++i > finduser_retries) break;
5056 /* If we cannot get a user login, log the incident and give up, unless the
5057 configuration specifies something to use. When running in the test harness,
5058 any setting of unknown_login overrides the actual name. */
5060 if (!originator_login || f.running_in_test_harness)
5064 originator_login = expand_string(unknown_login);
5065 if (!originator_name && unknown_username)
5066 originator_name = expand_string(unknown_username);
5067 if (!originator_name) originator_name = US"";
5069 if (!originator_login)
5070 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5074 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5077 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5079 /* If a message is created by this call of Exim, the uid/gid of its originator
5080 are those of the caller. These values are overridden if an existing message is
5081 read in from the spool. */
5083 originator_uid = real_uid;
5084 originator_gid = real_gid;
5086 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5087 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5089 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5090 returns. We leave this till here so that the originator_ fields are available
5091 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5094 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5098 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5099 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5100 "mua_wrapper is set");
5103 # ifndef DISABLE_TLS
5104 /* This also checks that the library linkage is working and we can call
5105 routines in it, so call even if tls_require_ciphers is unset */
5107 # ifdef MEASURE_TIMING
5109 (void)gettimeofday(&t0, NULL);
5111 if (!tls_dropprivs_validate_require_cipher(FALSE))
5113 # ifdef MEASURE_TIMING
5114 report_time_since(&t0, US"validate_ciphers (delta)");
5122 /* If the sender ident has not been set (by a trusted caller) set it to
5123 the caller. This will get overwritten below for an inetd call. If a trusted
5124 caller has set it empty, unset it. */
5126 if (!sender_ident) sender_ident = originator_login;
5127 else if (!*sender_ident) sender_ident = NULL;
5129 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5130 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5131 originator_* variables set. */
5133 if (test_rewrite_arg >= 0)
5135 f.really_exim = FALSE;
5136 if (test_rewrite_arg >= argc)
5138 printf("-brw needs an address argument\n");
5139 exim_exit(EXIT_FAILURE);
5141 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5142 exim_exit(EXIT_SUCCESS);
5145 /* A locally-supplied message is considered to be coming from a local user
5146 unless a trusted caller supplies a sender address with -f, or is passing in the
5147 message via SMTP (inetd invocation or otherwise). */
5149 if ( !sender_address && !smtp_input
5150 || !f.trusted_caller && filter_test == FTEST_NONE)
5152 f.sender_local = TRUE;
5154 /* A trusted caller can supply authenticated_sender and authenticated_id
5155 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5156 defaults except when host checking. */
5158 if (!authenticated_sender && !host_checking)
5159 authenticated_sender = string_sprintf("%s@%s", originator_login,
5160 qualify_domain_sender);
5161 if (!authenticated_id && !host_checking)
5162 authenticated_id = originator_login;
5165 /* Trusted callers are always permitted to specify the sender address.
5166 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5167 is specified is the empty address. However, if a trusted caller does not
5168 specify a sender address for SMTP input, we leave sender_address unset. This
5169 causes the MAIL commands to be honoured. */
5171 if ( !smtp_input && !sender_address
5172 || !receive_check_set_sender(sender_address))
5174 /* Either the caller is not permitted to set a general sender, or this is
5175 non-SMTP input and the trusted caller has not set a sender. If there is no
5176 sender, or if a sender other than <> is set, override with the originator's
5177 login (which will get qualified below), except when checking things. */
5179 if ( !sender_address /* No sender_address set */
5181 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5182 !checking)) /* Not running tests, including filter tests */
5184 sender_address = originator_login;
5185 f.sender_address_forced = FALSE;
5186 sender_address_domain = 0;
5190 /* Remember whether an untrusted caller set the sender address */
5192 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5194 /* Ensure that the sender address is fully qualified unless it is the empty
5195 address, which indicates an error message, or doesn't exist (root caller, smtp
5196 interface, no -f argument). */
5198 if (sender_address && *sender_address && sender_address_domain == 0)
5199 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5200 qualify_domain_sender);
5202 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5204 /* Handle a request to verify a list of addresses, or test them for delivery.
5205 This must follow the setting of the sender address, since routers can be
5206 predicated upon the sender. If no arguments are given, read addresses from
5207 stdin. Set debug_level to at least D_v to get full output for address testing.
5210 if (verify_address_mode || f.address_test_mode)
5213 int flags = vopt_qualify;
5215 if (verify_address_mode)
5217 if (!verify_as_sender) flags |= vopt_is_recipient;
5218 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5223 flags |= vopt_is_recipient;
5224 debug_selector |= D_v;
5225 debug_file = stderr;
5226 debug_fd = fileno(debug_file);
5227 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5230 if (recipients_arg < argc)
5231 while (recipients_arg < argc)
5233 /* Supplied addresses are tainted since they come from a user */
5234 uschar * s = string_copy_taint(
5235 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5239 BOOL finished = FALSE;
5240 uschar *ss = parse_find_address_end(s, FALSE);
5241 if (*ss == ',') *ss = 0; else finished = TRUE;
5242 test_address(s, flags, &exit_value);
5245 while (*++s == ',' || isspace(*s)) ;
5251 uschar * s = get_stdinput(NULL, NULL);
5253 test_address(string_copy_taint(
5254 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5256 flags, &exit_value);
5260 exim_exit(exit_value);
5263 /* Handle expansion checking. Either expand items on the command line, or read
5264 from stdin if there aren't any. If -Mset was specified, load the message so
5265 that its variables can be used, but restrict this facility to admin users.
5266 Otherwise, if -bem was used, read a message from stdin. */
5270 dns_init(FALSE, FALSE, FALSE);
5271 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5275 exim_fail("exim: permission denied\n");
5276 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5277 /* Checking the length of the ID is sufficient to validate it.
5278 Get an untainted version so file opens can be done. */
5279 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5281 spoolname = string_sprintf("%s-H", message_id);
5282 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5283 printf ("Failed to load message datafile %s\n", message_id);
5284 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5285 printf ("Failed to load message %s\n", message_id);
5288 /* Read a test message from a file. We fudge it up to be on stdin, saving
5289 stdin itself for later reading of expansion strings. */
5291 else if (expansion_test_message)
5293 int save_stdin = dup(0);
5294 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5296 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5299 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5300 message_ended = END_NOTENDED;
5301 read_message_body(receive_msg(extract_recipients));
5302 message_linecount += body_linecount;
5303 (void)dup2(save_stdin, 0);
5304 (void)close(save_stdin);
5305 clearerr(stdin); /* Required by Darwin */
5308 /* Only admin users may see config-file macros this way */
5310 if (!f.admin_user) macros_user = macros = mlast = NULL;
5312 /* Allow $recipients for this testing */
5314 f.enable_dollar_recipients = TRUE;
5316 /* Expand command line items */
5318 if (recipients_arg < argc)
5319 while (recipients_arg < argc)
5320 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5326 char *(*fn_readline)(const char *) = NULL;
5327 void (*fn_addhist)(const char *) = NULL;
5331 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5334 while (s = get_stdinput(fn_readline, fn_addhist))
5335 expansion_test_line(s);
5338 if (dlhandle) dlclose(dlhandle);
5342 /* The data file will be open after -Mset */
5344 if (deliver_datafile >= 0)
5346 (void)close(deliver_datafile);
5347 deliver_datafile = -1;
5350 exim_exit(EXIT_SUCCESS);
5354 /* The active host name is normally the primary host name, but it can be varied
5355 for hosts that want to play several parts at once. We need to ensure that it is
5356 set for host checking, and for receiving messages. */
5358 smtp_active_hostname = primary_hostname;
5359 if (raw_active_hostname != NULL)
5361 uschar *nah = expand_string(raw_active_hostname);
5364 if (!f.expand_string_forcedfail)
5365 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5366 "(smtp_active_hostname): %s", raw_active_hostname,
5367 expand_string_message);
5369 else if (nah[0] != 0) smtp_active_hostname = nah;
5372 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5373 given IP address so that the blocking and relay configuration can be tested.
5374 Unless a sender_ident was set by -oMt, we discard it (the default is the
5375 caller's login name). An RFC 1413 call is made only if we are running in the
5376 test harness and an incoming interface and both ports are specified, because
5377 there is no TCP/IP call to find the ident for. */
5384 if (!sender_ident_set)
5386 sender_ident = NULL;
5387 if (f.running_in_test_harness && sender_host_port
5388 && interface_address && interface_port)
5389 verify_get_ident(1223); /* note hardwired port number */
5392 /* In case the given address is a non-canonical IPv6 address, canonicalize
5393 it. The code works for both IPv4 and IPv6, as it happens. */
5395 size = host_aton(sender_host_address, x);
5396 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5397 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5399 /* Now set up for testing */
5401 host_build_sender_fullhost();
5405 f.sender_local = FALSE;
5406 f.sender_host_notsocket = TRUE;
5407 debug_file = stderr;
5408 debug_fd = fileno(debug_file);
5409 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5410 "**** but without any ident (RFC 1413) callback.\n"
5411 "**** This is not for real!\n\n",
5412 sender_host_address);
5414 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5415 if (verify_check_host(&hosts_connection_nolog) == OK)
5417 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5418 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5420 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5422 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5423 because a log line has already been written for all its failure exists
5424 (usually "connection refused: <reason>") and writing another one is
5425 unnecessary clutter. */
5427 if (smtp_start_session())
5430 for (; (reset_point = store_mark()); store_reset(reset_point))
5432 if (smtp_setup_msg() <= 0) break;
5433 if (!receive_msg(FALSE)) break;
5435 return_path = sender_address = NULL;
5436 dnslist_domain = dnslist_matched = NULL;
5437 #ifndef DISABLE_DKIM
5438 dkim_cur_signer = NULL;
5441 deliver_localpart_orig = NULL;
5442 deliver_domain_orig = NULL;
5443 callout_address = sending_ip_address = NULL;
5444 deliver_localpart_data = deliver_domain_data =
5445 recipient_data = sender_data = NULL;
5446 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5450 exim_exit(EXIT_SUCCESS);
5454 /* Arrange for message reception if recipients or SMTP were specified;
5455 otherwise complain unless a version print (-bV) happened or this is a filter
5456 verification test or info dump.
5457 In the former case, show the configuration file name. */
5459 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5461 if (version_printed)
5463 if (Ustrchr(config_main_filelist, ':'))
5464 printf("Configuration file search path is %s\n", config_main_filelist);
5465 printf("Configuration file is %s\n", config_main_filename);
5466 return EXIT_SUCCESS;
5469 if (info_flag != CMDINFO_NONE)
5471 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5472 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5475 if (filter_test == FTEST_NONE)
5476 exim_usage(called_as);
5480 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5481 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5482 that we are not called from inetd, because that is rejected above. The
5483 following configuration settings are forced here:
5485 (1) Synchronous delivery (-odi)
5486 (2) Errors to stderr (-oep == -oeq)
5487 (3) No parallel remote delivery
5488 (4) Unprivileged delivery
5490 We don't force overall queueing options because there are several of them;
5491 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5492 to override any SMTP queueing. */
5496 f.synchronous_delivery = TRUE;
5497 arg_error_handling = ERRORS_STDERR;
5498 remote_max_parallel = 1;
5499 deliver_drop_privilege = TRUE;
5500 f.queue_smtp = FALSE;
5501 queue_smtp_domains = NULL;
5503 message_utf8_downconvert = -1; /* convert-if-needed */
5508 /* Prepare to accept one or more new messages on the standard input. When a
5509 message has been read, its id is returned in message_id[]. If doing immediate
5510 delivery, we fork a delivery process for each received message, except for the
5511 last one, where we can save a process switch.
5513 It is only in non-smtp mode that error_handling is allowed to be changed from
5514 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5515 sendmail error modes other than -oem ever actually used? Later: yes.) */
5517 if (!smtp_input) error_handling = arg_error_handling;
5519 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5520 logging being sent down the socket and make an identd call to get the
5523 else if (f.is_inetd)
5525 (void)fclose(stderr);
5526 exim_nullstd(); /* Re-open to /dev/null */
5527 verify_get_ident(IDENT_PORT);
5528 host_build_sender_fullhost();
5529 set_process_info("handling incoming connection from %s via inetd",
5533 /* If the sender host address has been set, build sender_fullhost if it hasn't
5534 already been done (which it will have been for inetd). This caters for the
5535 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5536 so that the test for IP options is skipped for -bs input. */
5538 if (sender_host_address && !sender_fullhost)
5540 host_build_sender_fullhost();
5541 set_process_info("handling incoming connection from %s via -oMa",
5543 f.sender_host_notsocket = TRUE;
5546 /* Otherwise, set the sender host as unknown except for inetd calls. This
5547 prevents host checking in the case of -bs not from inetd and also for -bS. */
5549 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5551 /* If stdout does not exist, then dup stdin to stdout. This can happen
5552 if exim is started from inetd. In this case fd 0 will be set to the socket,
5553 but fd 1 will not be set. This also happens for passed SMTP channels. */
5555 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5557 /* Set up the incoming protocol name and the state of the program. Root is
5558 allowed to force received protocol via the -oMr option above. If we have come
5559 via inetd, the process info has already been set up. We don't set
5560 received_protocol here for smtp input, as it varies according to
5561 batch/HELO/EHLO/AUTH/TLS. */
5565 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5566 smtp_batched_input? "batched " : "",
5567 sender_address ? sender_address : originator_login);
5571 int old_pool = store_pool;
5572 store_pool = POOL_PERM;
5573 if (!received_protocol)
5574 received_protocol = string_sprintf("local%s", called_as);
5575 store_pool = old_pool;
5576 set_process_info("accepting a local non-SMTP message from <%s>",
5580 /* Initialize the session_local_queue-only flag (this will be ignored if
5581 mua_wrapper is set) */
5584 session_local_queue_only = queue_only;
5586 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5587 the spool if so configured. On failure, we must not attempt to send an error
5588 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5589 error code is given.) */
5591 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5592 exim_fail("exim: insufficient disk space\n");
5594 /* If this is smtp input of any kind, real or batched, handle the start of the
5597 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5598 because a log line has already been written for all its failure exists
5599 (usually "connection refused: <reason>") and writing another one is
5600 unnecessary clutter. */
5606 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5607 if (verify_check_host(&hosts_connection_nolog) == OK)
5609 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5610 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5612 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5613 if (!smtp_start_session())
5616 exim_exit(EXIT_SUCCESS);
5620 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5621 (we handle buferring so as to have visibility of fill level). */
5625 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5626 if (expand_string_message)
5627 if (thismessage_size_limit == -1)
5628 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5629 "message_size_limit: %s", expand_string_message);
5631 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5632 "message_size_limit: %s", expand_string_message);
5634 setvbuf(stdin, NULL, _IONBF, 0);
5637 /* Loop for several messages when reading SMTP input. If we fork any child
5638 processes, we don't want to wait for them unless synchronous delivery is
5639 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5640 same as SIG_DFL, despite the fact that documentation often lists the default as
5641 "ignore". This is a confusing area. This is what I know:
5643 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5644 processes that complete simply to go away without ever becoming defunct. You
5645 can't then wait for them - but we don't want to wait for them in the
5646 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5647 happen for all OS (e.g. *BSD is different).
5649 But that's not the end of the story. Some (many? all?) systems have the
5650 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5651 has by default, so it seems that the difference is merely one of default
5652 (compare restarting vs non-restarting signals).
5654 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5655 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5656 of the loop below. Paranoia rules.
5658 February 2003: That's *still* not the end of the story. There are now versions
5659 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5660 process then calls waitpid(), a grumble is written to the system log, because
5661 this is logically inconsistent. In other words, it doesn't like the paranoia.
5662 As a consequence of this, the waitpid() below is now excluded if we are sure
5663 that SIG_IGN works. */
5665 if (!f.synchronous_delivery)
5668 struct sigaction act;
5669 act.sa_handler = SIG_IGN;
5670 sigemptyset(&(act.sa_mask));
5671 act.sa_flags = SA_NOCLDWAIT;
5672 sigaction(SIGCHLD, &act, NULL);
5674 signal(SIGCHLD, SIG_IGN);
5678 /* Save the current store pool point, for resetting at the start of
5679 each message, and save the real sender address, if any. */
5681 real_sender_address = sender_address;
5683 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5684 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5687 for (BOOL more = TRUE; more; )
5689 rmark reset_point = store_mark();
5692 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5693 input and build the recipients list, before calling receive_msg() to read the
5694 message proper. Whatever sender address is given in the SMTP transaction is
5695 often ignored for local senders - we use the actual sender, which is normally
5696 either the underlying user running this process or a -f argument provided by
5697 a trusted caller. It is saved in real_sender_address. The test for whether to
5698 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5703 if ((rc = smtp_setup_msg()) > 0)
5705 if (real_sender_address != NULL &&
5706 !receive_check_set_sender(sender_address))
5708 sender_address = raw_sender = real_sender_address;
5709 sender_address_unrewritten = NULL;
5712 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5713 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5714 the very end. The result of the ACL is ignored (as for other non-SMTP
5715 messages). It is run for its potential side effects. */
5717 if (smtp_batched_input && acl_not_smtp_start != NULL)
5719 uschar *user_msg, *log_msg;
5720 f.enable_dollar_recipients = TRUE;
5721 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5722 &user_msg, &log_msg);
5723 f.enable_dollar_recipients = FALSE;
5726 /* Now get the data for the message */
5728 more = receive_msg(extract_recipients);
5731 cancel_cutthrough_connection(TRUE, US"receive dropped");
5732 if (more) goto MORELOOP;
5733 smtp_log_no_mail(); /* Log no mail if configured */
5734 exim_exit(EXIT_FAILURE);
5739 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5740 smtp_log_no_mail(); /* Log no mail if configured */
5741 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5745 /* In the non-SMTP case, we have all the information from the command
5746 line, but must process it in case it is in the more general RFC822
5747 format, and in any case, to detect syntax errors. Also, it appears that
5748 the use of comma-separated lists as single arguments is common, so we
5749 had better support them. */
5754 int count = argc - recipients_arg;
5755 uschar **list = argv + recipients_arg;
5757 /* These options cannot be changed dynamically for non-SMTP messages */
5759 f.active_local_sender_retain = local_sender_retain;
5760 f.active_local_from_check = local_from_check;
5762 /* Save before any rewriting */
5764 raw_sender = string_copy(sender_address);
5766 /* Loop for each argument (supplied by user hence tainted) */
5768 for (int i = 0; i < count; i++)
5770 int start, end, domain;
5772 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5773 * We'll still want to cap it to something, just in case. */
5774 uschar * s = string_copy_taint(
5775 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5778 /* Loop for each comma-separated address */
5782 BOOL finished = FALSE;
5784 uschar *ss = parse_find_address_end(s, FALSE);
5786 if (*ss == ',') *ss = 0; else finished = TRUE;
5788 /* Check max recipients - if -t was used, these aren't recipients */
5790 if (recipients_max > 0 && ++rcount > recipients_max &&
5791 !extract_recipients)
5792 if (error_handling == ERRORS_STDERR)
5794 fprintf(stderr, "exim: too many recipients\n");
5795 exim_exit(EXIT_FAILURE);
5799 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5800 errors_sender_rc : EXIT_FAILURE;
5804 BOOL b = allow_utf8_domains;
5805 allow_utf8_domains = TRUE;
5808 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5812 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5813 else allow_utf8_domains = b;
5818 if (domain == 0 && !f.allow_unqualified_recipient)
5821 errmess = US"unqualified recipient address not allowed";
5825 if (error_handling == ERRORS_STDERR)
5827 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5828 string_printing(list[i]), errmess);
5829 exim_exit(EXIT_FAILURE);
5835 eblock.text1 = string_printing(list[i]);
5836 eblock.text2 = errmess;
5838 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5839 errors_sender_rc : EXIT_FAILURE;
5842 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5845 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5849 /* Show the recipients when debugging */
5853 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5854 if (recipients_list)
5856 debug_printf("Recipients:\n");
5857 for (int i = 0; i < recipients_count; i++)
5858 debug_printf(" %s\n", recipients_list[i].address);
5862 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5863 ignored; rejecting here would just add complication, and it can just as
5864 well be done later. Allow $recipients to be visible in the ACL. */
5866 if (acl_not_smtp_start)
5868 uschar *user_msg, *log_msg;
5869 f.enable_dollar_recipients = TRUE;
5870 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5871 &user_msg, &log_msg);
5872 f.enable_dollar_recipients = FALSE;
5875 /* Pause for a while waiting for input. If none received in that time,
5876 close the logfile, if we had one open; then if we wait for a long-running
5877 datasource (months, in one use-case) log rotation will not leave us holding
5880 if (!receive_timeout)
5881 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5884 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5885 will just read the headers for the message, and not write anything onto the
5888 message_ended = END_NOTENDED;
5889 more = receive_msg(extract_recipients);
5891 /* more is always FALSE here (not SMTP message) when reading a message
5892 for real; when reading the headers of a message for filter testing,
5893 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5895 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5896 } /* Non-SMTP message reception */
5898 /* If this is a filter testing run, there are headers in store, but
5899 no message on the spool. Run the filtering code in testing mode, setting
5900 the domain to the qualify domain and the local part to the current user,
5901 unless they have been set by options. The prefix and suffix are left unset
5902 unless specified. The the return path is set to to the sender unless it has
5903 already been set from a return-path header in the message. */
5905 if (filter_test != FTEST_NONE)
5907 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5908 deliver_domain_orig = deliver_domain;
5909 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5910 deliver_localpart_orig = deliver_localpart;
5911 deliver_localpart_prefix = US ftest_prefix;
5912 deliver_localpart_suffix = US ftest_suffix;
5913 deliver_home = originator_home;
5917 printf("Return-path copied from sender\n");
5918 return_path = string_copy(sender_address);
5921 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5922 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5924 receive_add_recipient(
5925 string_sprintf("%s%s%s@%s",
5926 ftest_prefix ? ftest_prefix : US"",
5928 ftest_suffix ? ftest_suffix : US"",
5929 deliver_domain), -1);
5931 printf("Recipient = %s\n", recipients_list[0].address);
5932 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5933 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5935 if (chdir("/")) /* Get away from wherever the user is running this from */
5937 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5938 exim_exit(EXIT_FAILURE);
5941 /* Now we run either a system filter test, or a user filter test, or both.
5942 In the latter case, headers added by the system filter will persist and be
5943 available to the user filter. We need to copy the filter variables
5946 if (filter_test & FTEST_SYSTEM)
5947 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5948 exim_exit(EXIT_FAILURE);
5950 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5952 if (filter_test & FTEST_USER)
5953 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5954 exim_exit(EXIT_FAILURE);
5956 exim_exit(EXIT_SUCCESS);
5959 /* Else act on the result of message reception. We should not get here unless
5960 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5961 will be TRUE. If it is not, check on the number of messages received in this
5964 if ( !session_local_queue_only
5965 && smtp_accept_queue_per_connection > 0
5966 && receive_messagecount > smtp_accept_queue_per_connection)
5968 session_local_queue_only = TRUE;
5969 queue_only_reason = 2;
5972 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5973 and queue_only_load is set, check that the load average is below it. If it is
5974 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5975 default), we put the whole session into queue_only mode. It then remains this
5976 way for any subsequent messages on the same SMTP connection. This is a
5977 deliberate choice; even though the load average may fall, it doesn't seem
5978 right to deliver later messages on the same call when not delivering earlier
5979 ones. However, there are odd cases where this is not wanted, so this can be
5980 changed by setting queue_only_load_latch false. */
5982 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5983 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5985 queue_only_reason = 3;
5986 if (queue_only_load_latch) session_local_queue_only = TRUE;
5989 /* If running as an MUA wrapper, all queueing options and freezing options
5993 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5995 /* Log the queueing here, when it will get a message id attached, but
5996 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5999 if (local_queue_only)
6001 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6002 switch(queue_only_reason)
6005 log_write(L_delay_delivery,
6006 LOG_MAIN, "no immediate delivery: more than %d messages "
6007 "received in one connection", smtp_accept_queue_per_connection);
6011 log_write(L_delay_delivery,
6012 LOG_MAIN, "no immediate delivery: load average %.2f",
6013 (double)load_average/1000.0);
6018 else if (f.queue_only_policy || f.deliver_freeze)
6019 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6021 /* Else do the delivery unless the ACL or local_scan() called for queue only
6022 or froze the message. Always deliver in a separate process. A fork failure is
6023 not a disaster, as the delivery will eventually happen on a subsequent queue
6024 run. The search cache must be tidied before the fork, as the parent will
6025 do it before exiting. The child will trigger a lookup failure and
6026 thereby defer the delivery if it tries to use (for example) a cached ldap
6027 connection that the parent has called unbind on. */
6034 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6037 close_unwanted(); /* Close unwanted file descriptors and TLS */
6038 exim_nullstd(); /* Ensure std{in,out,err} exist */
6040 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6041 mode, deliver_drop_privilege is forced TRUE). */
6043 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6045 delivery_re_exec(CEE_EXEC_EXIT);
6046 /* Control does not return here. */
6049 /* No need to re-exec */
6051 rc = deliver_message(message_id, FALSE, FALSE);
6053 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6054 ? EXIT_SUCCESS : EXIT_FAILURE);
6059 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6060 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6061 "process: %s", strerror(errno));
6065 release_cutthrough_connection(US"msg passed for delivery");
6067 /* In the parent, wait if synchronous delivery is required. This will
6068 always be the case in MUA wrapper mode. */
6070 if (f.synchronous_delivery)
6073 while (wait(&status) != pid);
6074 if ((status & 0x00ff) != 0)
6075 log_write(0, LOG_MAIN|LOG_PANIC,
6076 "process %d crashed with signal %d while delivering %s",
6077 (int)pid, status & 0x00ff, message_id);
6078 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6083 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6084 automatically reaps children (see comments above the loop), clear away any
6085 finished subprocesses here, in case there are lots of messages coming in
6086 from the same source. */
6088 #ifndef SIG_IGN_WORKS
6089 while (waitpid(-1, NULL, WNOHANG) > 0);
6093 return_path = sender_address = NULL;
6094 authenticated_sender = NULL;
6095 deliver_localpart_orig = NULL;
6096 deliver_domain_orig = NULL;
6097 deliver_host = deliver_host_address = NULL;
6098 dnslist_domain = dnslist_matched = NULL;
6099 #ifdef WITH_CONTENT_SCAN
6100 malware_name = NULL;
6103 callout_address = NULL;
6104 sending_ip_address = NULL;
6105 deliver_localpart_data = deliver_domain_data =
6106 recipient_data = sender_data = NULL;
6109 store_reset(reset_point);
6112 exim_exit(EXIT_SUCCESS); /* Never returns */
6113 return 0; /* To stop compiler warning */