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 };
213 g = string_fmt_append(&gs, "%5d ", (int)getpid());
215 va_start(ap, format);
216 if (!string_vformat(g, 0, format, ap))
219 g = string_cat(&gs, US"**** string overflowed buffer ****");
221 g = string_catn(g, US"\n", 1);
222 string_from_gstring(g);
223 process_info_len = g->ptr;
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);
847 /* fail if a length is too long */
849 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
851 if (itemlen <= maxlen)
853 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
854 itemlen, maxlen, description);
858 /* only pass through the string item back to the caller if it's short enough */
859 static inline const uschar *
860 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
862 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
866 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
867 of chown()/fchown(). See src/functions.h for more explanation */
869 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
871 int saved_errno = errno; /* from the preceeding chown call */
873 log_write(0, LOG_MAIN|LOG_PANIC,
874 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
875 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
876 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
878 /* I leave this here, commented, in case the "bug"(?) comes up again.
879 It is not an Exim bug, but we can provide a workaround.
885 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
887 if (buf.st_uid == owner && buf.st_gid == group) return 0;
888 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
890 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
898 /*************************************************
899 * Extract port from host address *
900 *************************************************/
902 /* Called to extract the port from the values given to -oMa and -oMi.
903 It also checks the syntax of the address, and terminates it before the
904 port data when a port is extracted.
907 address the address, with possible port on the end
909 Returns: the port, or zero if there isn't one
910 bombs out on a syntax error
914 check_port(uschar *address)
916 int port = host_address_extract_port(address);
917 if (string_is_ip_address(address, NULL) == 0)
918 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
924 /*************************************************
925 * Test/verify an address *
926 *************************************************/
928 /* This function is called by the -bv and -bt code. It extracts a working
929 address from a full RFC 822 address. This isn't really necessary per se, but it
930 has the effect of collapsing source routes.
934 flags flag bits for verify_address()
935 exit_value to be set for failures
941 test_address(uschar *s, int flags, int *exit_value)
943 int start, end, domain;
944 uschar *parse_error = NULL;
945 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
949 fprintf(stdout, "syntax error: %s\n", parse_error);
954 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
955 -1, -1, NULL, NULL, NULL);
956 if (rc == FAIL) *exit_value = 2;
957 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
963 /*************************************************
964 * Show supported features *
965 *************************************************/
968 show_string(BOOL is_stdout, gstring * g)
970 const uschar * s = string_from_gstring(g);
972 if (is_stdout) fputs(CCS s, stdout);
973 else debug_printf("%s", s);
978 show_db_version(gstring * g)
980 #ifdef DB_VERSION_STRING
983 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
984 g = string_fmt_append(g, " Runtime: %s\n",
985 db_version(NULL, NULL, NULL));
988 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
990 #elif defined(BTREEVERSION) && defined(HASHVERSION)
992 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
994 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
997 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
998 g = string_cat(g, US"Probably ndbm\n");
999 #elif defined(USE_TDB)
1000 g = string_cat(g, US"Using tdb\n");
1003 g = string_cat(g, US"Probably GDBM (native mode)\n");
1005 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1012 /* This function is called for -bV/--version and for -d to output the optional
1013 features of the current Exim binary.
1015 Arguments: BOOL, true for stdout else debug channel
1020 show_whats_supported(BOOL is_stdout)
1022 rmark reset_point = store_mark();
1025 DEBUG(D_any) {} else g = show_db_version(g);
1027 g = string_cat(g, US"Support for:");
1028 #ifdef SUPPORT_CRYPTEQ
1029 g = string_cat(g, US" crypteq");
1032 g = string_cat(g, US" iconv()");
1035 g = string_cat(g, US" IPv6");
1037 #ifdef HAVE_SETCLASSRESOURCES
1038 g = string_cat(g, US" use_setclassresources");
1041 g = string_cat(g, US" PAM");
1044 g = string_cat(g, US" Perl");
1046 #ifdef EXPAND_DLFUNC
1047 g = string_cat(g, US" Expand_dlfunc");
1049 #ifdef USE_TCP_WRAPPERS
1050 g = string_cat(g, US" TCPwrappers");
1053 g = string_cat(g, US" GnuTLS");
1056 g = string_cat(g, US" OpenSSL");
1058 #ifndef DISABLE_TLS_RESUME
1059 g = string_cat(g, US" TLS_resume");
1061 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1062 g = string_cat(g, US" translate_ip_address");
1064 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1065 g = string_cat(g, US" move_frozen_messages");
1067 #ifdef WITH_CONTENT_SCAN
1068 g = string_cat(g, US" Content_Scanning");
1071 g = string_cat(g, US" DANE");
1073 #ifndef DISABLE_DKIM
1074 g = string_cat(g, US" DKIM");
1076 #ifdef SUPPORT_DMARC
1077 g = string_cat(g, US" DMARC");
1079 #ifndef DISABLE_DNSSEC
1080 g = string_cat(g, US" DNSSEC");
1082 #ifndef DISABLE_EVENT
1083 g = string_cat(g, US" Event");
1086 g = string_cat(g, US" I18N");
1088 #ifndef DISABLE_OCSP
1089 g = string_cat(g, US" OCSP");
1091 #ifndef DISABLE_PIPE_CONNECT
1092 g = string_cat(g, US" PIPECONNECT");
1094 #ifndef DISABLE_PRDR
1095 g = string_cat(g, US" PRDR");
1097 #ifdef SUPPORT_PROXY
1098 g = string_cat(g, US" PROXY");
1100 #ifndef DISABLE_QUEUE_RAMP
1101 g = string_cat(g, US" Queue_Ramp");
1103 #ifdef SUPPORT_SOCKS
1104 g = string_cat(g, US" SOCKS");
1107 g = string_cat(g, US" SPF");
1109 #if defined(SUPPORT_SRS)
1110 g = string_cat(g, US" SRS");
1114 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1116 #ifdef EXPERIMENTAL_ARC
1117 g = string_cat(g, US" Experimental_ARC");
1119 #ifdef EXPERIMENTAL_BRIGHTMAIL
1120 g = string_cat(g, US" Experimental_Brightmail");
1122 #ifdef EXPERIMENTAL_DCC
1123 g = string_cat(g, US" Experimental_DCC");
1125 #ifdef EXPERIMENTAL_DSN_INFO
1126 g = string_cat(g, US" Experimental_DSN_info");
1128 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1129 g = string_cat(g, US" Experimental_ESMTP_Limits");
1131 #ifdef EXPERIMENTAL_QUEUEFILE
1132 g = string_cat(g, US" Experimental_QUEUEFILE");
1134 g = string_cat(g, US"\n");
1136 g = string_cat(g, US"Lookups (built-in):");
1137 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1138 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1140 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1141 g = string_cat(g, US" cdb");
1143 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1144 g = string_cat(g, US" dbm dbmjz dbmnz");
1146 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1147 g = string_cat(g, US" dnsdb");
1149 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1150 g = string_cat(g, US" dsearch");
1152 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1153 g = string_cat(g, US" ibase");
1155 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1156 g = string_cat(g, US" json");
1158 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1159 g = string_cat(g, US" ldap ldapdn ldapm");
1162 g = string_cat(g, US" lmdb");
1164 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1165 g = string_cat(g, US" mysql");
1167 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1168 g = string_cat(g, US" nis nis0");
1170 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1171 g = string_cat(g, US" nisplus");
1173 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1174 g = string_cat(g, US" oracle");
1176 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1177 g = string_cat(g, US" passwd");
1179 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1180 g = string_cat(g, US" pgsql");
1182 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1183 g = string_cat(g, US" redis");
1185 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1186 g = string_cat(g, US" sqlite");
1188 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1189 g = string_cat(g, US" testdb");
1191 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1192 g = string_cat(g, US" whoson");
1194 g = string_cat(g, US"\n");
1196 g = auth_show_supported(g);
1197 g = route_show_supported(g);
1198 g = transport_show_supported(g);
1200 #ifdef WITH_CONTENT_SCAN
1201 g = malware_show_supported(g);
1203 show_string(is_stdout, g); g = NULL;
1205 if (fixed_never_users[0] > 0)
1208 g = string_cat(g, US"Fixed never_users: ");
1209 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1210 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1211 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1214 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1216 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1218 /* Everything else is details which are only worth reporting when debugging.
1219 Perhaps the tls_version_report should move into this too. */
1223 /* clang defines __GNUC__ (at least, for me) so test for it first */
1224 #if defined(__clang__)
1225 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1226 #elif defined(__GNUC__)
1227 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1231 "? unknown version ?"
1235 g = string_cat(g, US"Compiler: <unknown>\n");
1238 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1239 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1240 __GLIBC__, __GLIBC_MINOR__);
1241 if (__GLIBC_PREREQ(2, 1))
1242 g = string_fmt_append(g, " Runtime: %s\n",
1243 gnu_get_libc_version());
1246 g = show_db_version(g);
1249 g = tls_version_report(g);
1252 g = utf8_version_report(g);
1254 #ifdef SUPPORT_DMARC
1255 g = dmarc_version_report(g);
1258 g = spf_lib_version_report(g);
1261 show_string(is_stdout, g);
1264 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1265 if (authi->version_report)
1266 g = (*authi->version_report)(g);
1268 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1269 characters; unless it's an ancient version of PCRE in which case it
1271 #ifndef PCRE_PRERELEASE
1272 # define PCRE_PRERELEASE
1275 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1278 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1279 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1281 PCRE2_MAJOR, PCRE2_MINOR,
1282 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1286 #undef EXPAND_AND_QUOTE
1288 show_string(is_stdout, g);
1292 for (int i = 0; i < lookup_list_count; i++)
1293 if (lookup_list[i]->version_report)
1294 g = lookup_list[i]->version_report(g);
1295 show_string(is_stdout, g);
1298 #ifdef WHITELIST_D_MACROS
1299 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1301 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1303 #ifdef TRUSTED_CONFIG_LIST
1304 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1306 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1310 show_string(is_stdout, g);
1311 store_reset(reset_point);
1315 /*************************************************
1316 * Show auxiliary information about Exim *
1317 *************************************************/
1320 show_exim_information(enum commandline_info request, FILE *stream)
1325 fprintf(stream, "Oops, something went wrong.\n");
1329 "The -bI: flag takes a string indicating which information to provide.\n"
1330 "If the string is not recognised, you'll get this help (on stderr).\n"
1332 " exim -bI:help this information\n"
1333 " exim -bI:dscp list of known dscp value keywords\n"
1334 " exim -bI:sieve list of supported sieve extensions\n"
1338 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1339 fprintf(stream, "%s\n", *pp);
1342 dscp_list_to_stream(stream);
1348 /*************************************************
1349 * Quote a local part *
1350 *************************************************/
1352 /* This function is used when a sender address or a From: or Sender: header
1353 line is being created from the caller's login, or from an authenticated_id. It
1354 applies appropriate quoting rules for a local part.
1356 Argument: the local part
1357 Returns: the local part, quoted if necessary
1361 local_part_quote(uschar *lpart)
1363 BOOL needs_quote = FALSE;
1366 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1368 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1369 (*t != '.' || t == lpart || t[1] == 0);
1372 if (!needs_quote) return lpart;
1374 g = string_catn(NULL, US"\"", 1);
1378 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1381 g = string_cat(g, lpart);
1384 g = string_catn(g, lpart, nq - lpart);
1385 g = string_catn(g, US"\\", 1);
1386 g = string_catn(g, nq, 1);
1390 g = string_catn(g, US"\"", 1);
1391 return string_from_gstring(g);
1397 /*************************************************
1398 * Load readline() functions *
1399 *************************************************/
1401 /* This function is called from testing executions that read data from stdin,
1402 but only when running as the calling user. Currently, only -be does this. The
1403 function loads the readline() function library and passes back the functions.
1404 On some systems, it needs the curses library, so load that too, but try without
1405 it if loading fails. All this functionality has to be requested at build time.
1408 fn_readline_ptr pointer to where to put the readline pointer
1409 fn_addhist_ptr pointer to where to put the addhistory function
1411 Returns: the dlopen handle or NULL on failure
1415 set_readline(char * (**fn_readline_ptr)(const char *),
1416 void (**fn_addhist_ptr)(const char *))
1419 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1421 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1422 if (dlhandle_curses) dlclose(dlhandle_curses);
1426 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1427 * char * readline (const char *prompt);
1428 * void add_history (const char *string);
1430 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1431 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1434 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1442 /*************************************************
1443 * Get a line from stdin for testing things *
1444 *************************************************/
1446 /* This function is called when running tests that can take a number of lines
1447 of input (for example, -be and -bt). It handles continuations and trailing
1448 spaces. And prompting and a blank line output on eof. If readline() is in use,
1449 the arguments are non-NULL and provide the relevant functions.
1452 fn_readline readline function or NULL
1453 fn_addhist addhist function or NULL
1455 Returns: pointer to dynamic memory, or NULL at end of file
1459 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1462 BOOL had_input = FALSE;
1464 if (!fn_readline) { printf("> "); fflush(stdout); }
1466 for (int i = 0;; i++)
1468 uschar buffer[1024];
1472 char *readline_line = NULL;
1475 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1476 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1477 p = US readline_line;
1482 /* readline() not in use */
1485 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1489 /* Handle the line */
1492 ss = p + Ustrlen(p);
1493 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1496 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1498 g = string_catn(g, p, ss - p);
1501 if (fn_readline) free(readline_line);
1504 /* g can only be NULL if ss==p */
1505 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1508 --g->ptr; /* drop the \ */
1511 if (had_input) return g ? string_from_gstring(g) : US"";
1518 /*************************************************
1519 * Output usage information for the program *
1520 *************************************************/
1522 /* This function is called when there are no recipients
1523 or a specific --help argument was added.
1526 progname information on what name we were called by
1528 Returns: DOES NOT RETURN
1532 exim_usage(uschar *progname)
1535 /* Handle specific program invocation variants */
1536 if (Ustrcmp(progname, US"-mailq") == 0)
1538 "mailq - list the contents of the mail queue\n\n"
1539 "For a list of options, see the Exim documentation.\n");
1541 /* Generic usage - we output this whatever happens */
1543 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1544 "not directly from a shell command line. Options and/or arguments control\n"
1545 "what it does when called. For a list of options, see the Exim documentation.\n");
1550 /*************************************************
1551 * Validate that the macros given are okay *
1552 *************************************************/
1554 /* Typically, Exim will drop privileges if macros are supplied. In some
1555 cases, we want to not do so.
1557 Arguments: opt_D_used - true if the commandline had a "-D" option
1558 Returns: true if trusted, false otherwise
1562 macros_trusted(BOOL opt_D_used)
1564 #ifdef WHITELIST_D_MACROS
1565 uschar *whitelisted, *end, *p, **whites;
1566 int white_count, i, n;
1568 BOOL prev_char_item, found;
1573 #ifndef WHITELIST_D_MACROS
1577 /* We only trust -D overrides for some invoking users:
1578 root, the exim run-time user, the optional config owner user.
1579 I don't know why config-owner would be needed, but since they can own the
1580 config files anyway, there's no security risk to letting them override -D. */
1581 if ( ! ((real_uid == root_uid)
1582 || (real_uid == exim_uid)
1583 #ifdef CONFIGURE_OWNER
1584 || (real_uid == config_uid)
1588 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1592 /* Get a list of macros which are whitelisted */
1593 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1594 prev_char_item = FALSE;
1596 for (p = whitelisted; *p != '\0'; ++p)
1598 if (*p == ':' || isspace(*p))
1603 prev_char_item = FALSE;
1606 if (!prev_char_item)
1607 prev_char_item = TRUE;
1614 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1615 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1620 if (i == white_count)
1622 while (*p != '\0' && p < end)
1628 /* The list of commandline macros should be very short.
1629 Accept the N*M complexity. */
1630 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1633 for (uschar ** w = whites; *w; ++w)
1634 if (Ustrcmp(*w, m->name) == 0)
1641 if (!m->replacement)
1643 if ((len = m->replen) == 0)
1645 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1648 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1654 /*************************************************
1655 * Expansion testing *
1656 *************************************************/
1658 /* Expand and print one item, doing macro-processing.
1661 item line for expansion
1665 expansion_test_line(const uschar * line)
1671 Ustrncpy(big_buffer, line, big_buffer_size);
1672 big_buffer[big_buffer_size-1] = '\0';
1673 len = Ustrlen(big_buffer);
1675 (void) macros_expand(0, &len, &dummy_macexp);
1677 if (isupper(big_buffer[0]))
1679 if (macro_read_assignment(big_buffer))
1680 printf("Defined macro '%s'\n", mlast->name);
1682 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1683 printf("%s\n", acl_standalone_setvar(big_buffer+4));
1685 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1686 else printf("Failed: %s\n", expand_string_message);
1691 /*************************************************
1692 * Entry point and high-level code *
1693 *************************************************/
1695 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1696 the appropriate action. All the necessary functions are present in the one
1697 binary. I originally thought one should split it up, but it turns out that so
1698 much of the apparatus is needed in each chunk that one might as well just have
1699 it all available all the time, which then makes the coding easier as well.
1702 argc count of entries in argv
1703 argv argument strings, with argv[0] being the program name
1705 Returns: EXIT_SUCCESS if terminated successfully
1706 EXIT_FAILURE otherwise, except when a message has been sent
1707 to the sender, and -oee was given
1711 main(int argc, char **cargv)
1713 uschar **argv = USS cargv;
1714 int arg_receive_timeout = -1;
1715 int arg_smtp_receive_timeout = -1;
1716 int arg_error_handling = error_handling;
1717 int filter_sfd = -1;
1718 int filter_ufd = -1;
1721 int list_queue_option = 0;
1723 int msg_action_arg = -1;
1724 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1725 int queue_only_reason = 0;
1727 int perl_start_option = 0;
1729 int recipients_arg = argc;
1730 int sender_address_domain = 0;
1731 int test_retry_arg = -1;
1732 int test_rewrite_arg = -1;
1733 gid_t original_egid;
1734 BOOL arg_queue_only = FALSE;
1735 BOOL bi_option = FALSE;
1736 BOOL checking = FALSE;
1737 BOOL count_queue = FALSE;
1738 BOOL expansion_test = FALSE;
1739 BOOL extract_recipients = FALSE;
1740 BOOL flag_G = FALSE;
1741 BOOL flag_n = FALSE;
1742 BOOL forced_delivery = FALSE;
1743 BOOL f_end_dot = FALSE;
1744 BOOL deliver_give_up = FALSE;
1745 BOOL list_queue = FALSE;
1746 BOOL list_options = FALSE;
1747 BOOL list_config = FALSE;
1748 BOOL local_queue_only;
1749 BOOL one_msg_action = FALSE;
1750 BOOL opt_D_used = FALSE;
1751 BOOL queue_only_set = FALSE;
1752 BOOL receiving_message = TRUE;
1753 BOOL sender_ident_set = FALSE;
1754 BOOL session_local_queue_only;
1756 BOOL removed_privilege = FALSE;
1757 BOOL usage_wanted = FALSE;
1758 BOOL verify_address_mode = FALSE;
1759 BOOL verify_as_sender = FALSE;
1760 BOOL rcpt_verify_quota = FALSE;
1761 BOOL version_printed = FALSE;
1762 uschar *alias_arg = NULL;
1763 uschar *called_as = US"";
1764 uschar *cmdline_syslog_name = NULL;
1765 uschar *start_queue_run_id = NULL;
1766 uschar *stop_queue_run_id = NULL;
1767 uschar *expansion_test_message = NULL;
1768 const uschar *ftest_domain = NULL;
1769 const uschar *ftest_localpart = NULL;
1770 const uschar *ftest_prefix = NULL;
1771 const uschar *ftest_suffix = NULL;
1772 uschar *log_oneline = NULL;
1773 uschar *malware_test_file = NULL;
1774 uschar *real_sender_address;
1775 uschar *originator_home = US"/";
1779 struct stat statbuf;
1780 pid_t passed_qr_pid = (pid_t)0;
1781 int passed_qr_pipe = -1;
1782 gid_t group_list[EXIM_GROUPLIST_SIZE];
1784 /* For the -bI: flag */
1785 enum commandline_info info_flag = CMDINFO_NONE;
1786 BOOL info_stdout = FALSE;
1788 /* Possible options for -R and -S */
1790 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1792 /* Need to define this in case we need to change the environment in order
1793 to get rid of a bogus time zone. We have to make it char rather than uschar
1794 because some OS define it in /usr/include/unistd.h. */
1796 extern char **environ;
1798 #ifdef MEASURE_TIMING
1799 (void)gettimeofday(×tamp_startup, NULL);
1802 store_init(); /* Initialise the memory allocation susbsystem */
1803 pcre_init(); /* Set up memory handling for pcre */
1805 /* If the Exim user and/or group and/or the configuration file owner/group were
1806 defined by ref:name at build time, we must now find the actual uid/gid values.
1807 This is a feature to make the lives of binary distributors easier. */
1809 #ifdef EXIM_USERNAME
1810 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1813 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1815 /* If ref:name uses a number as the name, route_finduser() returns
1816 TRUE with exim_uid set and pw coerced to NULL. */
1818 exim_gid = pw->pw_gid;
1819 #ifndef EXIM_GROUPNAME
1822 "exim: ref:name should specify a usercode, not a group.\n"
1823 "exim: can't let you get away with it unless you also specify a group.\n");
1827 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1830 #ifdef EXIM_GROUPNAME
1831 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1832 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1835 #ifdef CONFIGURE_OWNERNAME
1836 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1837 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1838 CONFIGURE_OWNERNAME);
1841 /* We default the system_filter_user to be the Exim run-time user, as a
1842 sane non-root value. */
1843 system_filter_uid = exim_uid;
1845 #ifdef CONFIGURE_GROUPNAME
1846 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1847 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1848 CONFIGURE_GROUPNAME);
1851 /* In the Cygwin environment, some initialization used to need doing.
1852 It was fudged in by means of this macro; now no longer but we'll leave
1853 it in case of others. */
1859 /* Check a field which is patched when we are running Exim within its
1860 testing harness; do a fast initial check, and then the whole thing. */
1862 f.running_in_test_harness =
1863 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1864 if (f.running_in_test_harness)
1867 /* Protect against abusive argv[0] */
1868 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1869 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1871 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1872 at the start of a program; however, it seems that some environments do not
1873 follow this. A "strange" locale can affect the formatting of timestamps, so we
1876 setlocale(LC_ALL, "C");
1878 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1880 #ifdef _POSIX_MONOTONIC_CLOCK
1884 /* Set up the default handler for timing using alarm(). */
1886 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1888 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1889 because store_malloc writes a log entry on failure. */
1891 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1892 exim_fail("exim: failed to get store for log buffer\n");
1894 /* Initialize the default log options. */
1896 bits_set(log_selector, log_selector_size, log_default);
1898 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1899 NULL when the daemon is run and the file is closed. We have to use this
1900 indirection, because some systems don't allow writing to the variable "stderr".
1903 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1905 /* Ensure there is a big buffer for temporary use in several places. It is put
1906 in malloc store so that it can be freed for enlargement if necessary. */
1908 big_buffer = store_malloc(big_buffer_size);
1910 /* Set up the handler for the data request signal, and set the initial
1911 descriptive text. */
1913 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1914 set_process_info("initializing");
1915 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1918 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1919 sigaction(SIGSEGV, &act, NULL);
1922 signal(SIGSEGV, segv_handler); /* log faults */
1925 /* If running in a dockerized environment, the TERM signal is only
1926 delegated to the PID 1 if we request it by setting an signal handler */
1927 if (getpid() == 1) signal(SIGTERM, term_handler);
1929 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1930 in the daemon code. For the rest of Exim's uses, we ignore it. */
1932 signal(SIGHUP, SIG_IGN);
1934 /* We don't want to die on pipe errors as the code is written to handle
1935 the write error instead. */
1937 signal(SIGPIPE, SIG_IGN);
1939 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1940 set to SIG_IGN. This causes subprocesses that complete before the parent
1941 process waits for them not to hang around, so when Exim calls wait(), nothing
1942 is there. The wait() code has been made robust against this, but let's ensure
1943 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1944 ending status. We use sigaction rather than plain signal() on those OS where
1945 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1946 problem on AIX with this.) */
1950 struct sigaction act;
1951 act.sa_handler = SIG_DFL;
1952 sigemptyset(&(act.sa_mask));
1954 sigaction(SIGCHLD, &act, NULL);
1957 signal(SIGCHLD, SIG_DFL);
1960 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1965 /* Set up the version number. Set up the leading 'E' for the external form of
1966 message ids, set the pointer to the internal form, and initialize it to
1967 indicate no message being processed. */
1970 message_id_option[0] = '-';
1971 message_id_external = message_id_option + 1;
1972 message_id_external[0] = 'E';
1973 message_id = message_id_external + 1;
1976 /* Set the umask to zero so that any files Exim creates using open() are
1977 created with the modes that it specifies. NOTE: Files created with fopen() have
1978 a problem, which was not recognized till rather late (February 2006). With this
1979 umask, such files will be world writeable. (They are all content scanning files
1980 in the spool directory, which isn't world-accessible, so this is not a
1981 disaster, but it's untidy.) I don't want to change this overall setting,
1982 however, because it will interact badly with the open() calls. Instead, there's
1983 now a function called modefopen() that fiddles with the umask while calling
1988 /* Precompile the regular expression for matching a message id. Keep this in
1989 step with the code that generates ids in the accept.c module. We need to do
1990 this here, because the -M options check their arguments for syntactic validity
1991 using mac_ismsgid, which uses this. */
1994 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
1996 /* Precompile the regular expression that is used for matching an SMTP error
1997 code, possibly extended, at the start of an error message. Note that the
1998 terminating whitespace character is included. */
2001 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2004 #ifdef WHITELIST_D_MACROS
2005 /* Precompile the regular expression used to filter the content of macros
2006 given to -D for permissibility. */
2008 regex_whitelisted_macro =
2009 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2012 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2013 this seems to be a generally accepted convention, since one finds symbolic
2014 links called "mailq" in standard OS configurations. */
2016 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2017 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2020 receiving_message = FALSE;
2021 called_as = US"-mailq";
2024 /* If the program is called as "rmail" treat it as equivalent to
2025 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2026 i.e. preventing a single dot on a line from terminating the message, and
2027 returning with zero return code, even in cases of error (provided an error
2028 message has been sent). */
2030 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2031 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2034 called_as = US"-rmail";
2035 errors_sender_rc = EXIT_SUCCESS;
2038 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2039 this is a smail convention. */
2041 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2042 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2044 smtp_input = smtp_batched_input = TRUE;
2045 called_as = US"-rsmtp";
2048 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2049 this is a smail convention. */
2051 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2052 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2055 receiving_message = FALSE;
2056 called_as = US"-runq";
2059 /* If the program is called as "newaliases" treat it as equivalent to
2060 "exim -bi"; this is a sendmail convention. */
2062 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2063 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2066 receiving_message = FALSE;
2067 called_as = US"-newaliases";
2070 /* Save the original effective uid for a couple of uses later. It should
2071 normally be root, but in some esoteric environments it may not be. */
2073 original_euid = geteuid();
2074 original_egid = getegid();
2076 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2077 to be the same as the real ones. This makes a difference only if Exim is setuid
2078 (or setgid) to something other than root, which could be the case in some
2079 special configurations. */
2081 real_uid = getuid();
2082 real_gid = getgid();
2084 if (real_uid == root_uid)
2086 if ((rv = setgid(real_gid)))
2087 exim_fail("exim: setgid(%ld) failed: %s\n",
2088 (long int)real_gid, strerror(errno));
2089 if ((rv = setuid(real_uid)))
2090 exim_fail("exim: setuid(%ld) failed: %s\n",
2091 (long int)real_uid, strerror(errno));
2094 /* If neither the original real uid nor the original euid was root, Exim is
2095 running in an unprivileged state. */
2097 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2099 /* For most of the args-parsing we need to use permanent pool memory */
2101 int old_pool = store_pool;
2102 store_pool = POOL_PERM;
2104 /* Scan the program's arguments. Some can be dealt with right away; others are
2105 simply recorded for checking and handling afterwards. Do a high-level switch
2106 on the second character (the one after '-'), to save some effort. */
2108 for (i = 1; i < argc; i++)
2110 BOOL badarg = FALSE;
2111 uschar * arg = argv[i];
2115 /* An argument not starting with '-' is the start of a recipients list;
2116 break out of the options-scanning loop. */
2124 /* An option consisting of -- terminates the options */
2126 if (Ustrcmp(arg, "--") == 0)
2128 recipients_arg = i + 1;
2132 /* Handle flagged options */
2134 switchchar = arg[1];
2137 /* Make all -ex options synonymous with -oex arguments, since that
2138 is assumed by various callers. Also make -qR options synonymous with -R
2139 options, as that seems to be required as well. Allow for -qqR too, and
2140 the same for -S options. */
2142 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2143 Ustrncmp(arg+1, "qR", 2) == 0 ||
2144 Ustrncmp(arg+1, "qS", 2) == 0)
2146 switchchar = arg[2];
2149 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2151 switchchar = arg[3];
2153 f.queue_2stage = TRUE;
2156 /* Make -r synonymous with -f, since it is a documented alias */
2158 else if (arg[1] == 'r') switchchar = 'f';
2160 /* Make -ov synonymous with -v */
2162 else if (Ustrcmp(arg, "-ov") == 0)
2168 /* deal with --option_aliases */
2169 else if (switchchar == '-')
2171 if (Ustrcmp(argrest, "help") == 0)
2173 usage_wanted = TRUE;
2176 else if (Ustrcmp(argrest, "version") == 0)
2183 /* High-level switch on active initial letter */
2188 /* sendmail uses -Ac and -Am to control which .cf file is used;
2191 if (!*argrest) { badarg = TRUE; break; }
2194 BOOL ignore = FALSE;
2199 if (*(argrest + 1) == '\0')
2203 if (!ignore) badarg = TRUE;
2207 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2208 so has no need of it. */
2211 if (!*argrest) i++; /* Skip over the type */
2217 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2221 /* -bd: Run in daemon mode, awaiting SMTP connections.
2222 -bdf: Ditto, but in the foreground.
2225 f.daemon_listen = f.daemon_scion = TRUE;
2226 if (*argrest == 'f') f.background_daemon = FALSE;
2227 else if (*argrest) badarg = TRUE;
2230 /* -be: Run in expansion test mode
2231 -bem: Ditto, but read a message from a file first
2234 expansion_test = checking = TRUE;
2235 if (*argrest == 'm')
2237 if (++i >= argc) { badarg = TRUE; break; }
2238 expansion_test_message = argv[i];
2241 if (*argrest) badarg = TRUE;
2244 /* -bF: Run system filter test */
2246 filter_test |= checking = FTEST_SYSTEM;
2247 if (*argrest) badarg = TRUE;
2248 else if (++i < argc) filter_test_sfile = argv[i];
2249 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2252 /* -bf: Run user filter test
2253 -bfd: Set domain for filter testing
2254 -bfl: Set local part for filter testing
2255 -bfp: Set prefix for filter testing
2256 -bfs: Set suffix for filter testing
2261 filter_test |= checking = FTEST_USER;
2262 if (++i < argc) filter_test_ufile = argv[i];
2263 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2268 exim_fail("exim: string expected after %s\n", arg);
2269 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2270 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2271 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2272 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2277 /* -bh: Host checking - an IP address must follow. */
2279 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2281 if (++i >= argc) { badarg = TRUE; break; }
2282 sender_host_address = string_copy_taint(
2283 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2285 host_checking = checking = f.log_testing_mode = TRUE;
2286 f.host_checking_callout = *argrest == 'c';
2287 message_logs = FALSE;
2292 /* -bi: This option is used by sendmail to initialize *the* alias file,
2293 though it has the -oA option to specify a different file. Exim has no
2294 concept of *the* alias file, but since Sun's YP make script calls
2295 sendmail this way, some support must be provided. */
2297 if (!*argrest) bi_option = TRUE;
2301 /* -bI: provide information, of the type to follow after a colon.
2302 This is an Exim flag. */
2304 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2306 uschar *p = argrest+1;
2307 info_flag = CMDINFO_HELP;
2309 if (strcmpic(p, CUS"sieve") == 0)
2311 info_flag = CMDINFO_SIEVE;
2314 else if (strcmpic(p, CUS"dscp") == 0)
2316 info_flag = CMDINFO_DSCP;
2319 else if (strcmpic(p, CUS"help") == 0)
2325 /* -bm: Accept and deliver message - the default option. Reinstate
2326 receiving_message, which got turned off for all -b options.
2327 -bmalware: test the filename given for malware */
2329 if (!*argrest) receiving_message = TRUE;
2330 else if (Ustrcmp(argrest, "alware") == 0)
2332 if (++i >= argc) { badarg = TRUE; break; }
2334 malware_test_file = argv[i];
2339 /* -bnq: For locally originating messages, do not qualify unqualified
2340 addresses. In the envelope, this causes errors; in header lines they
2343 if (Ustrcmp(argrest, "q") == 0)
2345 f.allow_unqualified_sender = FALSE;
2346 f.allow_unqualified_recipient = FALSE;
2351 /* -bpxx: List the contents of the mail queue, in various forms. If
2352 the option is -bpc, just a queue count is needed. Otherwise, if the
2353 first letter after p is r, then order is random. */
2355 if (*argrest == 'c')
2358 if (*++argrest) badarg = TRUE;
2362 if (*argrest == 'r')
2364 list_queue_option = 8;
2367 else list_queue_option = 0;
2371 /* -bp: List the contents of the mail queue, top-level only */
2375 /* -bpu: List the contents of the mail queue, top-level undelivered */
2377 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2379 /* -bpa: List the contents of the mail queue, including all delivered */
2381 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2383 /* Unknown after -bp[r] */
2389 /* -bP: List the configuration variables given as the address list.
2390 Force -v, so configuration errors get displayed. */
2393 /* -bP config: we need to setup here, because later,
2394 when list_options is checked, the config is read already */
2397 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2400 readconf_save_config(version_string);
2404 list_options = TRUE;
2405 debug_selector |= D_v;
2406 debug_file = stderr;
2410 /* -brt: Test retry configuration lookup */
2412 if (Ustrcmp(argrest, "t") == 0)
2415 test_retry_arg = i + 1;
2419 /* -brw: Test rewrite configuration */
2421 else if (Ustrcmp(argrest, "w") == 0)
2424 test_rewrite_arg = i + 1;
2430 /* -bS: Read SMTP commands on standard input, but produce no replies -
2431 all errors are reported by sending messages. */
2434 smtp_input = smtp_batched_input = receiving_message = TRUE;
2438 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2439 on standard output. */
2441 if (!*argrest) smtp_input = receiving_message = TRUE;
2445 /* -bt: address testing mode */
2448 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2452 /* -bv: verify addresses */
2455 verify_address_mode = checking = f.log_testing_mode = TRUE;
2457 /* -bvs: verify sender addresses */
2459 else if (Ustrcmp(argrest, "s") == 0)
2461 verify_address_mode = checking = f.log_testing_mode = TRUE;
2462 verify_as_sender = TRUE;
2467 /* -bV: Print version string and support details */
2471 printf("Exim version %s #%s built %s\n", version_string,
2472 version_cnumber, version_date);
2473 printf("%s\n", CS version_copyright);
2474 version_printed = TRUE;
2475 show_whats_supported(TRUE);
2476 f.log_testing_mode = TRUE;
2481 /* -bw: inetd wait mode, accept a listening socket as stdin */
2483 f.inetd_wait_mode = TRUE;
2484 f.background_daemon = FALSE;
2485 f.daemon_listen = f.daemon_scion = TRUE;
2487 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2488 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2499 /* -C: change configuration file list; ignore if it isn't really
2500 a change! Enforce a prefix check if required. */
2504 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2505 if (Ustrcmp(config_main_filelist, argrest) != 0)
2507 #ifdef ALT_CONFIG_PREFIX
2509 int len = Ustrlen(ALT_CONFIG_PREFIX);
2510 const uschar *list = argrest;
2512 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2513 while((filename = string_nextinlist(&list, &sep, big_buffer,
2515 if ( ( Ustrlen(filename) < len
2516 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2517 || Ustrstr(filename, "/../") != NULL
2519 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2521 exim_fail("-C Permission denied\n");
2523 if (real_uid != root_uid)
2525 #ifdef TRUSTED_CONFIG_LIST
2527 if (real_uid != exim_uid
2528 #ifdef CONFIGURE_OWNER
2529 && real_uid != config_uid
2532 f.trusted_config = FALSE;
2535 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2538 struct stat statbuf;
2540 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2541 (statbuf.st_uid != root_uid /* owner not root */
2542 #ifdef CONFIGURE_OWNER
2543 && statbuf.st_uid != config_uid /* owner not the special one */
2546 (statbuf.st_gid != root_gid /* group not root */
2547 #ifdef CONFIGURE_GROUP
2548 && statbuf.st_gid != config_gid /* group not the special one */
2550 && (statbuf.st_mode & 020) != 0 /* group writeable */
2552 (statbuf.st_mode & 2) != 0) /* world writeable */
2554 f.trusted_config = FALSE;
2559 /* Well, the trust list at least is up to scratch... */
2561 uschar *trusted_configs[32];
2564 int old_pool = store_pool;
2565 store_pool = POOL_MAIN;
2567 reset_point = store_mark();
2568 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2570 uschar *start = big_buffer, *nl;
2571 while (*start && isspace(*start))
2575 nl = Ustrchr(start, '\n');
2578 trusted_configs[nr_configs++] = string_copy(start);
2579 if (nr_configs == nelem(trusted_configs))
2587 const uschar *list = argrest;
2589 while (f.trusted_config && (filename = string_nextinlist(&list,
2590 &sep, big_buffer, big_buffer_size)))
2592 for (i=0; i < nr_configs; i++)
2593 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2595 if (i == nr_configs)
2597 f.trusted_config = FALSE;
2602 else /* No valid prefixes found in trust_list file. */
2603 f.trusted_config = FALSE;
2604 store_reset(reset_point);
2605 store_pool = old_pool;
2608 else /* Could not open trust_list file. */
2609 f.trusted_config = FALSE;
2612 /* Not root; don't trust config */
2613 f.trusted_config = FALSE;
2617 config_main_filelist = argrest;
2618 f.config_changed = TRUE;
2623 /* -D: set up a macro definition */
2626 #ifdef DISABLE_D_OPTION
2627 exim_fail("exim: -D is not available in this Exim binary\n");
2633 uschar *s = argrest;
2636 while (isspace(*s)) s++;
2638 if (*s < 'A' || *s > 'Z')
2639 exim_fail("exim: macro name set by -D must start with "
2640 "an upper case letter\n");
2642 while (isalnum(*s) || *s == '_')
2644 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2648 if (ptr == 0) { badarg = TRUE; break; }
2649 while (isspace(*s)) s++;
2652 if (*s++ != '=') { badarg = TRUE; break; }
2653 while (isspace(*s)) s++;
2656 for (m = macros_user; m; m = m->next)
2657 if (Ustrcmp(m->name, name) == 0)
2658 exim_fail("exim: duplicated -D in command line\n");
2660 m = macro_create(name, s, TRUE);
2662 if (clmacro_count >= MAX_CLMACROS)
2663 exim_fail("exim: too many -D options on command line\n");
2664 clmacros[clmacro_count++] =
2665 string_sprintf("-D%s=%s", m->name, m->replacement);
2672 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2674 if (Ustrcmp(argrest, "ropcr") == 0)
2676 /* drop_cr = TRUE; */
2679 /* -dp: Set up a debug pretrigger buffer with given size. */
2681 else if (Ustrcmp(argrest, "p") == 0)
2685 debug_pretrigger_setup(argv[i]);
2687 /* -dt: Set a debug trigger selector */
2689 else if (Ustrncmp(argrest, "t=", 2) == 0)
2690 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2692 /* -d: Set debug level (see also -v below).
2693 If -dd is used, debugging subprocesses of the daemon is disabled. */
2697 /* Use an intermediate variable so that we don't set debugging while
2698 decoding the debugging bits. */
2700 unsigned int selector = D_default;
2703 if (*argrest == 'd')
2705 f.debug_daemon = TRUE;
2709 decode_bits(&selector, 1, debug_notall, argrest,
2710 debug_options, debug_options_count, US"debug", 0);
2711 debug_selector = selector;
2716 /* -E: This is a local error message. This option is not intended for
2717 external use at all, but is not restricted to trusted callers because it
2718 does no harm (just suppresses certain error messages) and if Exim is run
2719 not setuid root it won't always be trusted when it generates error
2720 messages using this option. If there is a message id following -E, point
2721 message_reference at it, for logging. */
2724 f.local_error_message = TRUE;
2725 if (mac_ismsgid(argrest)) message_reference = argrest;
2729 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2730 option, so it looks as if historically the -oex options are also callable
2731 without the leading -o. So we have to accept them. Before the switch,
2732 anything starting -oe has been converted to -e. Exim does not support all
2733 of the sendmail error options. */
2736 if (Ustrcmp(argrest, "e") == 0)
2738 arg_error_handling = ERRORS_SENDER;
2739 errors_sender_rc = EXIT_SUCCESS;
2741 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2742 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2743 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2744 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2749 /* -F: Set sender's full name, used instead of the gecos entry from
2750 the password file. Since users can usually alter their gecos entries,
2751 there's no security involved in using this instead. The data can follow
2752 the -F or be in the next argument. */
2756 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2757 originator_name = string_copy_taint(
2758 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2760 f.sender_name_forced = TRUE;
2764 /* -f: Set sender's address - this value is only actually used if Exim is
2765 run by a trusted user, or if untrusted_set_sender is set and matches the
2766 address, except that the null address can always be set by any user. The
2767 test for this happens later, when the value given here is ignored when not
2768 permitted. For an untrusted user, the actual sender is still put in Sender:
2769 if it doesn't match the From: header (unless no_local_from_check is set).
2770 The data can follow the -f or be in the next argument. The -r switch is an
2771 obsolete form of -f but since there appear to be programs out there that
2772 use anything that sendmail has ever supported, better accept it - the
2773 synonymizing is done before the switch above.
2775 At this stage, we must allow domain literal addresses, because we don't
2776 know what the setting of allow_domain_literals is yet. Ditto for trailing
2777 dots and strip_trailing_dot. */
2781 int dummy_start, dummy_end;
2784 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2785 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2787 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2790 uschar * temp = argrest + Ustrlen(argrest) - 1;
2791 while (temp >= argrest && isspace(*temp)) temp--;
2792 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2793 allow_domain_literals = TRUE;
2794 strip_trailing_dot = TRUE;
2796 allow_utf8_domains = TRUE;
2798 if (!(sender_address = parse_extract_address(argrest, &errmess,
2799 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2800 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2802 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2804 message_smtputf8 = string_is_utf8(sender_address);
2805 allow_utf8_domains = FALSE;
2807 allow_domain_literals = FALSE;
2808 strip_trailing_dot = FALSE;
2810 f.sender_address_forced = TRUE;
2814 /* -G: sendmail invocation to specify that it's a gateway submission and
2815 sendmail may complain about problems instead of fixing them.
2816 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2817 not at this time complain about problems. */
2823 /* -h: Set the hop count for an incoming message. Exim does not currently
2824 support this; it always computes it by counting the Received: headers.
2825 To put it in will require a change to the spool header file format. */
2829 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2830 if (!isdigit(*argrest)) badarg = TRUE;
2834 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2835 not to be documented for sendmail but mailx (at least) uses it) */
2838 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2842 /* -L: set the identifier used for syslog; equivalent to setting
2843 syslog_processname in the config file, but needs to be an admin option. */
2847 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2848 if ((sz = Ustrlen(argrest)) > 32)
2849 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2851 exim_fail("exim: the -L syslog name is too short\n");
2852 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2856 receiving_message = FALSE;
2858 /* -MC: continue delivery of another message via an existing open
2859 file descriptor. This option is used for an internal call by the
2860 smtp transport when there is a pending message waiting to go to an
2861 address to which it has got a connection. Five subsequent arguments are
2862 required: transport name, host name, IP address, sequence number, and
2863 message_id. Transports may decline to create new processes if the sequence
2864 number gets too big. The channel is stdin. This (-MC) must be the last
2865 argument. There's a subsequent check that the real-uid is privileged.
2867 If we are running in the test harness. delay for a bit, to let the process
2868 that set this one up complete. This makes for repeatability of the logging,
2871 if (Ustrcmp(argrest, "C") == 0)
2873 union sockaddr_46 interface_sock;
2874 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2877 exim_fail("exim: too many or too few arguments after -MC\n");
2879 if (msg_action_arg >= 0)
2880 exim_fail("exim: incompatible arguments\n");
2882 continue_transport = string_copy_taint(
2883 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2885 continue_hostname = string_copy_taint(
2886 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2888 continue_host_address = string_copy_taint(
2889 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2891 continue_sequence = Uatoi(argv[++i]);
2892 msg_action = MSG_DELIVER;
2893 msg_action_arg = ++i;
2894 forced_delivery = TRUE;
2895 queue_run_pid = passed_qr_pid;
2896 queue_run_pipe = passed_qr_pipe;
2898 if (!mac_ismsgid(argv[i]))
2899 exim_fail("exim: malformed message id %s after -MC option\n",
2902 /* Set up $sending_ip_address and $sending_port, unless proxied */
2904 if (!continue_proxy_cipher)
2905 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2907 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2910 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2913 testharness_pause_ms(500);
2917 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2921 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2922 precedes -MC (see above). The flag indicates that the host to which
2923 Exim is connected has accepted an AUTH sequence. */
2925 case 'A': f.smtp_authenticated = TRUE; break;
2927 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2928 that exim is connected to supports the esmtp extension DSN */
2930 case 'D': smtp_peer_options |= OPTION_DSN; break;
2932 /* -MCd: for debug, set a process-purpose string */
2934 case 'd': if (++i < argc)
2935 process_purpose = string_copy_taint(
2936 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2941 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2942 from the commandline should be tainted - but we will need an untainted
2943 value for the spoolfile when doing a -odi delivery process. */
2945 case 'G': if (++i < argc) queue_name = string_copy_taint(
2946 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2951 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2953 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2955 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2956 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2957 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2959 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2961 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2966 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2967 it preceded -MC (see above) */
2969 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2971 #ifdef SUPPORT_SOCKS
2972 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2973 case 'p': proxy_session = TRUE;
2976 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
2979 proxy_local_port = Uatoi(argv[i]);
2982 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
2985 proxy_external_port = Uatoi(argv[i]);
2991 /* -MCQ: pass on the pid of the queue-running process that started
2992 this chain of deliveries and the fd of its synchronizing pipe; this
2993 is useful only when it precedes -MC (see above) */
2995 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2997 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3001 /* -MCq: do a quota check on the given recipient for the given size
3002 of message. Separate from -MC. */
3003 case 'q': rcpt_verify_quota = TRUE;
3004 if (++i < argc) message_size = Uatoi(argv[i]);
3008 /* -MCS: set the smtp_use_size flag; this is useful only when it
3009 precedes -MC (see above) */
3011 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3014 /* -MCs: used with -MCt; SNI was sent */
3015 /* -MCr: ditto, DANE */
3018 case 's': if (++i < argc)
3020 continue_proxy_sni = string_copy_taint(
3021 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3023 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3028 /* -MCt: similar to -MCT below but the connection is still open
3029 via a proxy process which handles the TLS context and coding.
3030 Require three arguments for the proxied local address and port,
3031 and the TLS cipher. */
3033 case 't': if (++i < argc)
3034 sending_ip_address = string_copy_taint(
3035 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3039 sending_port = (int)(Uatol(argv[i]));
3042 continue_proxy_cipher = string_copy_taint(
3043 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3048 /* -MCT: set the tls_offered flag; this is useful only when it
3049 precedes -MC (see above). The flag indicates that the host to which
3050 Exim is connected has offered TLS support. */
3052 case 'T': smtp_peer_options |= OPTION_TLS; break;
3055 default: badarg = TRUE; break;
3060 /* -M[x]: various operations on the following list of message ids:
3061 -M deliver the messages, ignoring next retry times and thawing
3062 -Mc deliver the messages, checking next retry times, no thawing
3063 -Mf freeze the messages
3064 -Mg give up on the messages
3065 -Mt thaw the messages
3066 -Mrm remove the messages
3067 In the above cases, this must be the last option. There are also the
3068 following options which are followed by a single message id, and which
3069 act on that message. Some of them use the "recipient" addresses as well.
3070 -Mar add recipient(s)
3071 -MG move to a different queue
3072 -Mmad mark all recipients delivered
3073 -Mmd mark recipients(s) delivered
3075 -Mset load a message for use with -be
3077 -Mvc show copy (of whole message, in RFC 2822 format)
3084 msg_action = MSG_DELIVER;
3085 forced_delivery = f.deliver_force_thaw = TRUE;
3087 else if (Ustrcmp(argrest, "ar") == 0)
3089 msg_action = MSG_ADD_RECIPIENT;
3090 one_msg_action = TRUE;
3092 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3093 else if (Ustrcmp(argrest, "es") == 0)
3095 msg_action = MSG_EDIT_SENDER;
3096 one_msg_action = TRUE;
3098 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3099 else if (Ustrcmp(argrest, "g") == 0)
3101 msg_action = MSG_DELIVER;
3102 deliver_give_up = TRUE;
3104 else if (Ustrcmp(argrest, "G") == 0)
3106 msg_action = MSG_SETQUEUE;
3107 queue_name_dest = string_copy_taint(
3108 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3111 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3112 else if (Ustrcmp(argrest, "md") == 0)
3114 msg_action = MSG_MARK_DELIVERED;
3115 one_msg_action = TRUE;
3117 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3118 else if (Ustrcmp(argrest, "set") == 0)
3120 msg_action = MSG_LOAD;
3121 one_msg_action = TRUE;
3123 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3124 else if (Ustrcmp(argrest, "vb") == 0)
3126 msg_action = MSG_SHOW_BODY;
3127 one_msg_action = TRUE;
3129 else if (Ustrcmp(argrest, "vc") == 0)
3131 msg_action = MSG_SHOW_COPY;
3132 one_msg_action = TRUE;
3134 else if (Ustrcmp(argrest, "vh") == 0)
3136 msg_action = MSG_SHOW_HEADER;
3137 one_msg_action = TRUE;
3139 else if (Ustrcmp(argrest, "vl") == 0)
3141 msg_action = MSG_SHOW_LOG;
3142 one_msg_action = TRUE;
3144 else { badarg = TRUE; break; }
3146 /* All the -Mxx options require at least one message id. */
3148 msg_action_arg = i + 1;
3149 if (msg_action_arg >= argc)
3150 exim_fail("exim: no message ids given after %s option\n", arg);
3152 /* Some require only message ids to follow */
3154 if (!one_msg_action)
3156 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3157 exim_fail("exim: malformed message id %s after %s option\n",
3159 goto END_ARG; /* Remaining args are ids */
3162 /* Others require only one message id, possibly followed by addresses,
3163 which will be handled as normal arguments. */
3167 if (!mac_ismsgid(argv[msg_action_arg]))
3168 exim_fail("exim: malformed message id %s after %s option\n",
3169 argv[msg_action_arg], arg);
3175 /* Some programs seem to call the -om option without the leading o;
3176 for sendmail it askes for "me too". Exim always does this. */
3179 if (*argrest) badarg = TRUE;
3183 /* -N: don't do delivery - a debugging option that stops transports doing
3184 their thing. It implies debugging at the D_v level. */
3189 f.dont_deliver = TRUE;
3190 debug_selector |= D_v;
3191 debug_file = stderr;
3197 /* -n: This means "don't alias" in sendmail, apparently.
3198 For normal invocations, it has no effect.
3199 It may affect some other options. */
3205 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3206 option to the specified value. This form uses long names. We need to handle
3207 -O option=value and -Ooption=value. */
3212 exim_fail("exim: string expected after -O\n");
3218 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3221 if (!*(alias_arg = argrest))
3222 if (i+1 < argc) alias_arg = argv[++i];
3223 else exim_fail("exim: string expected after -oA\n");
3226 /* -oB: Set a connection message max value for remote deliveries */
3229 uschar * p = argrest;
3231 if (i+1 < argc && isdigit((argv[i+1][0])))
3235 connection_max_messages = 1;
3242 exim_fail("exim: number expected after -oB\n");
3243 connection_max_messages = Uatoi(p);
3248 /* -odb: background delivery */
3251 if (Ustrcmp(argrest, "b") == 0)
3253 f.synchronous_delivery = FALSE;
3254 arg_queue_only = FALSE;
3255 queue_only_set = TRUE;
3258 /* -odd: testsuite-only: add no inter-process delays */
3260 else if (Ustrcmp(argrest, "d") == 0)
3261 f.testsuite_delays = FALSE;
3263 /* -odf: foreground delivery (smail-compatible option); same effect as
3264 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3267 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3269 f.synchronous_delivery = TRUE;
3270 arg_queue_only = FALSE;
3271 queue_only_set = TRUE;
3274 /* -odq: queue only */
3276 else if (Ustrcmp(argrest, "q") == 0)
3278 f.synchronous_delivery = FALSE;
3279 arg_queue_only = TRUE;
3280 queue_only_set = TRUE;
3283 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3284 but no remote delivery */
3286 else if (Ustrcmp(argrest, "qs") == 0)
3288 f.queue_smtp = TRUE;
3289 arg_queue_only = FALSE;
3290 queue_only_set = TRUE;
3295 /* -oex: Sendmail error flags. As these are also accepted without the
3296 leading -o prefix, for compatibility with vacation and other callers,
3297 they are handled with -e above. */
3299 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3300 -oitrue: Another sendmail syntax for the same */
3303 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3308 /* -oM*: Set various characteristics for an incoming message; actually
3309 acted on for trusted callers only. */
3314 exim_fail("exim: data expected after -oM%s\n", argrest);
3316 /* -oMa: Set sender host address */
3318 if (Ustrcmp(argrest, "a") == 0)
3319 sender_host_address = string_copy_taint(
3320 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3323 /* -oMaa: Set authenticator name */
3325 else if (Ustrcmp(argrest, "aa") == 0)
3326 sender_host_authenticated = string_copy_taint(
3327 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3330 /* -oMas: setting authenticated sender */
3332 else if (Ustrcmp(argrest, "as") == 0)
3333 authenticated_sender = string_copy_taint(
3334 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3337 /* -oMai: setting authenticated id */
3339 else if (Ustrcmp(argrest, "ai") == 0)
3340 authenticated_id = string_copy_taint(
3341 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMai"),
3344 /* -oMi: Set incoming interface address */
3346 else if (Ustrcmp(argrest, "i") == 0)
3347 interface_address = string_copy_taint(
3348 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3351 /* -oMm: Message reference */
3353 else if (Ustrcmp(argrest, "m") == 0)
3355 if (!mac_ismsgid(argv[i+1]))
3356 exim_fail("-oMm must be a valid message ID\n");
3357 if (!f.trusted_config)
3358 exim_fail("-oMm must be called by a trusted user/config\n");
3359 message_reference = argv[++i];
3362 /* -oMr: Received protocol */
3364 else if (Ustrcmp(argrest, "r") == 0)
3366 if (received_protocol)
3367 exim_fail("received_protocol is set already\n");
3369 received_protocol = string_copy_taint(
3370 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3373 /* -oMs: Set sender host name */
3375 else if (Ustrcmp(argrest, "s") == 0)
3376 sender_host_name = string_copy_taint(
3377 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3380 /* -oMt: Set sender ident */
3382 else if (Ustrcmp(argrest, "t") == 0)
3384 sender_ident_set = TRUE;
3385 sender_ident = string_copy_taint(
3386 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3390 /* Else a bad argument */
3397 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3398 seem to call this as -m (undocumented), so that is also accepted (see
3400 /* -oo: An ancient flag for old-style addresses which still seems to
3401 crop up in some calls (see in SCO). */
3405 if (*argrest) badarg = TRUE;
3408 /* -oP <name>: set pid file path for daemon
3409 -oPX: delete pid file of daemon */
3412 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3413 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3414 "(uid=%d euid=%d | %d)\n",
3415 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3416 if (!*argrest) override_pid_file_path = argv[++i];
3417 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3422 /* -or <n>: set timeout for non-SMTP acceptance
3423 -os <n>: set timeout for SMTP acceptance */
3428 int * tp = argrest[-1] == 'r'
3429 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3431 *tp = readconf_readtime(argrest, 0, FALSE);
3432 else if (i+1 < argc)
3433 *tp = readconf_readtime(argv[++i], 0, FALSE);
3436 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3440 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3441 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3444 if (*argrest) badarg = TRUE;
3445 else override_local_interfaces = string_copy_taint(
3446 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3450 /* -oY: Override creation of daemon notifier socket */
3453 if (*argrest) badarg = TRUE;
3454 else notifier_socket = NULL;
3457 /* Unknown -o argument */
3465 /* -ps: force Perl startup; -pd force delayed Perl startup */
3469 if (*argrest == 's' && argrest[1] == 0)
3471 perl_start_option = 1;
3474 if (*argrest == 'd' && argrest[1] == 0)
3476 perl_start_option = -1;
3481 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3482 which sets the host protocol and host name */
3485 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3489 uschar * hn = Ustrchr(argrest, ':');
3491 if (received_protocol)
3492 exim_fail("received_protocol is set already\n");
3495 received_protocol = string_copy_taint(
3496 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3500 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3501 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3502 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3509 receiving_message = FALSE;
3510 if (queue_interval >= 0)
3511 exim_fail("exim: -q specified more than once\n");
3513 /* -qq...: Do queue runs in a 2-stage manner */
3515 if (*argrest == 'q')
3517 f.queue_2stage = TRUE;
3521 /* -qi...: Do only first (initial) deliveries */
3523 if (*argrest == 'i')
3525 f.queue_run_first_delivery = TRUE;
3529 /* -qf...: Run the queue, forcing deliveries
3530 -qff..: Ditto, forcing thawing as well */
3532 if (*argrest == 'f')
3534 f.queue_run_force = TRUE;
3535 if (*++argrest == 'f')
3537 f.deliver_force_thaw = TRUE;
3542 /* -q[f][f]l...: Run the queue only on local deliveries */
3544 if (*argrest == 'l')
3546 f.queue_run_local = TRUE;
3550 /* -q[f][f][l][G<name>]... Work on the named queue */
3552 if (*argrest == 'G')
3555 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3556 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3557 queue_name = string_copyn(argrest, i);
3559 if (*argrest == '/') argrest++;
3562 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3563 only, optionally named, optionally starting from a given message id. */
3565 if (!(list_queue || count_queue))
3567 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3570 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3571 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3572 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3573 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3576 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3577 forced, optionally local only, optionally named. */
3579 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3581 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3585 case 'R': /* Synonymous with -qR... */
3587 const uschar *tainted_selectstr;
3589 receiving_message = FALSE;
3591 /* -Rf: As -R (below) but force all deliveries,
3592 -Rff: Ditto, but also thaw all frozen messages,
3593 -Rr: String is regex
3594 -Rrf: Regex and force
3595 -Rrff: Regex and force and thaw
3597 in all cases provided there are no further characters in this
3601 for (int i = 0; i < nelem(rsopts); i++)
3602 if (Ustrcmp(argrest, rsopts[i]) == 0)
3604 if (i != 2) f.queue_run_force = TRUE;
3605 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3606 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3607 argrest += Ustrlen(rsopts[i]);
3610 /* -R: Set string to match in addresses for forced queue run to
3611 pick out particular messages. */
3613 /* Avoid attacks from people providing very long strings, and do so before
3616 tainted_selectstr = argrest;
3617 else if (i+1 < argc)
3618 tainted_selectstr = argv[++i];
3620 exim_fail("exim: string expected after -R\n");
3621 deliver_selectstring = string_copy_taint(
3622 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3627 /* -r: an obsolete synonym for -f (see above) */
3630 /* -S: Like -R but works on sender. */
3632 case 'S': /* Synonymous with -qS... */
3634 const uschar *tainted_selectstr;
3636 receiving_message = FALSE;
3638 /* -Sf: As -S (below) but force all deliveries,
3639 -Sff: Ditto, but also thaw all frozen messages,
3640 -Sr: String is regex
3641 -Srf: Regex and force
3642 -Srff: Regex and force and thaw
3644 in all cases provided there are no further characters in this
3648 for (int i = 0; i < nelem(rsopts); i++)
3649 if (Ustrcmp(argrest, rsopts[i]) == 0)
3651 if (i != 2) f.queue_run_force = TRUE;
3652 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3653 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3654 argrest += Ustrlen(rsopts[i]);
3657 /* -S: Set string to match in addresses for forced queue run to
3658 pick out particular messages. */
3661 tainted_selectstr = argrest;
3662 else if (i+1 < argc)
3663 tainted_selectstr = argv[++i];
3665 exim_fail("exim: string expected after -S\n");
3666 deliver_selectstring_sender = string_copy_taint(
3667 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3672 /* -Tqt is an option that is exclusively for use by the testing suite.
3673 It is not recognized in other circumstances. It allows for the setting up
3674 of explicit "queue times" so that various warning/retry things can be
3675 tested. Otherwise variability of clock ticks etc. cause problems. */
3678 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3679 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3684 /* -t: Set flag to extract recipients from body of message. */
3687 if (!*argrest) extract_recipients = TRUE;
3689 /* -ti: Set flag to extract recipients from body of message, and also
3690 specify that dot does not end the message. */
3692 else if (Ustrcmp(argrest, "i") == 0)
3694 extract_recipients = TRUE;
3698 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3701 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3708 /* -U: This means "initial user submission" in sendmail, apparently. The
3709 doc claims that in future sendmail may refuse syntactically invalid
3710 messages instead of fixing them. For the moment, we just ignore it. */
3716 /* -v: verify things - this is a very low-level debugging */
3721 debug_selector |= D_v;
3722 debug_file = stderr;
3728 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3730 The -x flag tells the sendmail command that mail from a local
3731 mail program has National Language Support (NLS) extended characters
3732 in the body of the mail item. The sendmail command can send mail with
3733 extended NLS characters across networks that normally corrupts these
3736 As Exim is 8-bit clean, it just ignores this flag. */
3739 if (*argrest) badarg = TRUE;
3742 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3743 logs to that file. We swallow the parameter and otherwise ignore it. */
3748 exim_fail("exim: string expected after -X\n");
3751 /* -z: a line of text to log */
3756 log_oneline = string_copy_taint(
3757 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3760 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3763 /* All other initial characters are errors */
3768 } /* End of high-level switch statement */
3770 /* Failed to recognize the option, or syntax error */
3773 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3774 "option %s\n", arg);
3778 /* If -R or -S have been specified without -q, assume a single queue run. */
3780 if ( (deliver_selectstring || deliver_selectstring_sender)
3781 && queue_interval < 0)
3786 store_pool = old_pool;
3789 /* If usage_wanted is set we call the usage function - which never returns */
3790 if (usage_wanted) exim_usage(called_as);
3792 /* Arguments have been processed. Check for incompatibilities. */
3793 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3794 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3795 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3796 || filter_test != FTEST_NONE
3797 || msg_action_arg > 0 && !one_msg_action
3799 || ( msg_action_arg > 0
3800 && ( f.daemon_listen || queue_interval > 0 || list_options
3801 || checking && msg_action != MSG_LOAD
3802 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3804 || ( (f.daemon_listen || queue_interval > 0)
3805 && ( sender_address || list_options || list_queue || checking
3808 || f.daemon_listen && queue_interval == 0
3809 || f.inetd_wait_mode && queue_interval >= 0
3811 && ( checking || smtp_input || extract_recipients
3812 || filter_test != FTEST_NONE || bi_option
3814 || ( verify_address_mode
3815 && ( f.address_test_mode || smtp_input || extract_recipients
3816 || filter_test != FTEST_NONE || bi_option
3818 || ( f.address_test_mode
3819 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3823 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3825 || deliver_selectstring && queue_interval < 0
3826 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3828 exim_fail("exim: incompatible command-line options or arguments\n");
3830 /* If debugging is set up, set the file and the file descriptor to pass on to
3831 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3832 to run in the foreground. */
3834 if (debug_selector != 0)
3836 debug_file = stderr;
3837 debug_fd = fileno(debug_file);
3838 f.background_daemon = FALSE;
3839 testharness_pause_ms(100); /* lets caller finish */
3840 if (debug_selector != D_v) /* -v only doesn't show this */
3842 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3843 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3845 if (!version_printed)
3846 show_whats_supported(FALSE);
3850 /* When started with root privilege, ensure that the limits on the number of
3851 open files and the number of processes (where that is accessible) are
3852 sufficiently large, or are unset, in case Exim has been called from an
3853 environment where the limits are screwed down. Not all OS have the ability to
3854 change some of these limits. */
3858 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3864 #ifdef RLIMIT_NOFILE
3865 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3867 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3869 rlp.rlim_cur = rlp.rlim_max = 0;
3872 /* I originally chose 1000 as a nice big number that was unlikely to
3873 be exceeded. It turns out that some older OS have a fixed upper limit of
3876 if (rlp.rlim_cur < 1000)
3878 rlp.rlim_cur = rlp.rlim_max = 1000;
3879 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3881 rlp.rlim_cur = rlp.rlim_max = 256;
3882 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3883 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3890 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3892 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3894 rlp.rlim_cur = rlp.rlim_max = 0;
3897 # ifdef RLIM_INFINITY
3898 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3900 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3902 if (rlp.rlim_cur < 1000)
3904 rlp.rlim_cur = rlp.rlim_max = 1000;
3906 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3907 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3913 /* Exim is normally entered as root (but some special configurations are
3914 possible that don't do this). However, it always spins off sub-processes that
3915 set their uid and gid as required for local delivery. We don't want to pass on
3916 any extra groups that root may belong to, so we want to get rid of them all at
3919 We need to obey setgroups() at this stage, before possibly giving up root
3920 privilege for a changed configuration file, but later on we might need to
3921 check on the additional groups for the admin user privilege - can't do that
3922 till after reading the config, which might specify the exim gid. Therefore,
3923 save the group list here first. */
3925 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3926 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3928 /* There is a fundamental difference in some BSD systems in the matter of
3929 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3930 known not to be different. On the "different" systems there is a single group
3931 list, and the first entry in it is the current group. On all other versions of
3932 Unix there is a supplementary group list, which is in *addition* to the current
3933 group. Consequently, to get rid of all extraneous groups on a "standard" system
3934 you pass over 0 groups to setgroups(), while on a "different" system you pass
3935 over a single group - the current group, which is always the first group in the
3936 list. Calling setgroups() with zero groups on a "different" system results in
3937 an error return. The following code should cope with both types of system.
3939 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3940 the "setgroups() with zero groups" - and changes the egid.
3941 Thanks to that we had to stash the original_egid above, for use below
3942 in the call to exim_setugid().
3944 However, if this process isn't running as root, setgroups() can't be used
3945 since you have to be root to run it, even if throwing away groups.
3946 Except, sigh, for Hurd - where you can.
3947 Not being root here happens only in some unusual configurations. */
3950 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3951 && setgroups(0, NULL) != 0
3953 && setgroups(1, group_list) != 0)
3954 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3956 /* If the configuration file name has been altered by an argument on the
3957 command line (either a new file name or a macro definition) and the caller is
3958 not root, or if this is a filter testing run, remove any setuid privilege the
3959 program has and run as the underlying user.
3961 The exim user is locked out of this, which severely restricts the use of -C
3964 Otherwise, set the real ids to the effective values (should be root unless run
3965 from inetd, which it can either be root or the exim uid, if one is configured).
3967 There is a private mechanism for bypassing some of this, in order to make it
3968 possible to test lots of configurations automatically, without having either to
3969 recompile each time, or to patch in an actual configuration file name and other
3970 values (such as the path name). If running in the test harness, pretend that
3971 configuration file changes and macro definitions haven't happened. */
3974 (!f.trusted_config || /* Config changed, or */
3975 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3976 real_uid != root_uid && /* Not root, and */
3977 !f.running_in_test_harness /* Not fudged */
3979 expansion_test /* expansion testing */
3981 filter_test != FTEST_NONE) /* Filter testing */
3983 setgroups(group_count, group_list);
3984 exim_setugid(real_uid, real_gid, FALSE,
3985 US"-C, -D, -be or -bf forces real uid");
3986 removed_privilege = TRUE;
3988 /* In the normal case when Exim is called like this, stderr is available
3989 and should be used for any logging information because attempts to write
3990 to the log will usually fail. To arrange this, we unset really_exim. However,
3991 if no stderr is available there is no point - we might as well have a go
3992 at the log (if it fails, syslog will be written).
3994 Note that if the invoker is Exim, the logs remain available. Messing with
3995 this causes unlogged successful deliveries. */
3997 if (log_stderr && real_uid != exim_uid)
3998 f.really_exim = FALSE;
4001 /* Privilege is to be retained for the moment. It may be dropped later,
4002 depending on the job that this Exim process has been asked to do. For now, set
4003 the real uid to the effective so that subsequent re-execs of Exim are done by a
4007 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4009 /* If testing a filter, open the file(s) now, before wasting time doing other
4010 setups and reading the message. */
4012 if (filter_test & FTEST_SYSTEM)
4013 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4014 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4017 if (filter_test & FTEST_USER)
4018 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4019 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4022 /* Initialise lookup_list
4023 If debugging, already called above via version reporting.
4024 In either case, we initialise the list of available lookups while running
4025 as root. All dynamically modules are loaded from a directory which is
4026 hard-coded into the binary and is code which, if not a module, would be
4027 part of Exim already. Ability to modify the content of the directory
4028 is equivalent to the ability to modify a setuid binary!
4030 This needs to happen before we read the main configuration. */
4033 /*XXX this excrescence could move to the testsuite standard config setup file */
4035 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4038 /* Read the main runtime configuration data; this gives up if there
4039 is a failure. It leaves the configuration file open so that the subsequent
4040 configuration data for delivery can be read if needed.
4042 NOTE: immediately after opening the configuration file we change the working
4043 directory to "/"! Later we change to $spool_directory. We do it there, because
4044 during readconf_main() some expansion takes place already. */
4046 /* Store the initial cwd before we change directories. Can be NULL if the
4047 dir has already been unlinked. */
4048 initial_cwd = os_getcwd(NULL, 0);
4049 if (!initial_cwd && errno)
4050 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4052 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4053 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4056 -be[m] expansion test -
4057 -b[fF] filter test new
4059 -bmalware malware_test_file new
4061 -brw rewrite test new
4063 -bv[s] address verify -
4065 -bP <option> (except -bP config, which sets list_config)
4067 If any of these options is set, we suppress warnings about configuration
4068 issues (currently about tls_advertise_hosts and keep_environment not being
4072 int old_pool = store_pool;
4073 #ifdef MEASURE_TIMING
4075 (void)gettimeofday(&t0, NULL);
4078 store_pool = POOL_CONFIG;
4079 readconf_main(checking || list_options);
4080 store_pool = old_pool;
4082 #ifdef MEASURE_TIMING
4083 report_time_since(&t0, US"readconf_main (delta)");
4087 /* Now in directory "/" */
4089 if (cleanup_environment() == FALSE)
4090 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4093 /* If an action on specific messages is requested, or if a daemon or queue
4094 runner is being started, we need to know if Exim was called by an admin user.
4095 This is the case if the real user is root or exim, or if the real group is
4096 exim, or if one of the supplementary groups is exim or a group listed in
4097 admin_groups. We don't fail all message actions immediately if not admin_user,
4098 since some actions can be performed by non-admin users. Instead, set admin_user
4099 for later interrogation. */
4101 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4102 f.admin_user = TRUE;
4104 for (int i = 0; i < group_count && !f.admin_user; i++)
4105 if (group_list[i] == exim_gid)
4106 f.admin_user = TRUE;
4107 else if (admin_groups)
4108 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4109 if (admin_groups[j] == group_list[i])
4110 f.admin_user = TRUE;
4112 /* Another group of privileged users are the trusted users. These are root,
4113 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4114 are permitted to specify sender_addresses with -f on the command line, and
4115 other message parameters as well. */
4117 if (real_uid == root_uid || real_uid == exim_uid)
4118 f.trusted_caller = TRUE;
4122 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4123 if (trusted_users[i] == real_uid)
4124 f.trusted_caller = TRUE;
4127 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4128 if (trusted_groups[i] == real_gid)
4129 f.trusted_caller = TRUE;
4130 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4131 if (trusted_groups[i] == group_list[j])
4132 f.trusted_caller = TRUE;
4135 /* At this point, we know if the user is privileged and some command-line
4136 options become possibly impermissible, depending upon the configuration file. */
4138 if (checking && commandline_checks_require_admin && !f.admin_user)
4139 exim_fail("exim: those command-line flags are set to require admin\n");
4141 /* Handle the decoding of logging options. */
4143 decode_bits(log_selector, log_selector_size, log_notall,
4144 log_selector_string, log_options, log_options_count, US"log", 0);
4148 debug_printf("configuration file is %s\n", config_main_filename);
4149 debug_printf("log selectors =");
4150 for (int i = 0; i < log_selector_size; i++)
4151 debug_printf(" %08x", log_selector[i]);
4155 /* If domain literals are not allowed, check the sender address that was
4156 supplied with -f. Ditto for a stripped trailing dot. */
4160 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4161 exim_fail("exim: bad -f address \"%s\": domain literals not "
4162 "allowed\n", sender_address);
4163 if (f_end_dot && !strip_trailing_dot)
4164 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4165 "(trailing dot not allowed)\n", sender_address);
4168 /* See if an admin user overrode our logging. */
4170 if (cmdline_syslog_name)
4173 syslog_processname = cmdline_syslog_name;
4174 log_file_path = string_copy(CUS"syslog");
4177 /* not a panic, non-privileged users should not be able to spam paniclog */
4179 "exim: you lack sufficient privilege to specify syslog process name\n");
4181 /* Paranoia check of maximum lengths of certain strings. There is a check
4182 on the length of the log file path in log.c, which will come into effect
4183 if there are any calls to write the log earlier than this. However, if we
4184 get this far but the string is very long, it is better to stop now than to
4185 carry on and (e.g.) receive a message and then have to collapse. The call to
4186 log_write() from here will cause the ultimate panic collapse if the complete
4187 file name exceeds the buffer length. */
4189 if (Ustrlen(log_file_path) > 200)
4190 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4191 "log_file_path is longer than 200 chars: aborting");
4193 if (Ustrlen(pid_file_path) > 200)
4194 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4195 "pid_file_path is longer than 200 chars: aborting");
4197 if (Ustrlen(spool_directory) > 200)
4198 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4199 "spool_directory is longer than 200 chars: aborting");
4201 /* Length check on the process name given to syslog for its TAG field,
4202 which is only permitted to be 32 characters or less. See RFC 3164. */
4204 if (Ustrlen(syslog_processname) > 32)
4205 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4206 "syslog_processname is longer than 32 chars: aborting");
4211 log_write(0, LOG_MAIN, "%s", log_oneline);
4212 return EXIT_SUCCESS;
4215 return EXIT_FAILURE;
4217 /* In some operating systems, the environment variable TMPDIR controls where
4218 temporary files are created; Exim doesn't use these (apart from when delivering
4219 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4220 If TMPDIR is found in the environment, reset it to the value defined in the
4221 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4222 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4223 EXIM_TMPDIR by the build scripts.
4227 if (environ) for (uschar ** p = USS environ; *p; p++)
4228 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4230 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4231 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4233 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4237 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4238 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4239 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4240 called by a user who has set the TZ variable. This then affects the timestamps
4241 in log files and in Received: headers, and any created Date: header lines. The
4242 required timezone is settable in the configuration file, so nothing can be done
4243 about this earlier - but hopefully nothing will normally be logged earlier than
4244 this. We have to make a new environment if TZ is wrong, but don't bother if
4245 timestamps_utc is set, because then all times are in UTC anyway. */
4247 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4248 f.timestamps_utc = TRUE;
4251 uschar *envtz = US getenv("TZ");
4253 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4254 : timezone_string != NULL
4257 uschar **p = USS environ;
4261 if (environ) while (*p++) count++;
4262 if (!envtz) count++;
4263 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4264 if (environ) for (p = USS environ; *p; p++)
4265 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4266 if (timezone_string)
4268 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4269 sprintf(CS *newp++, "TZ=%s", timezone_string);
4274 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4275 tod_stamp(tod_log));
4279 /* Handle the case when we have removed the setuid privilege because of -C or
4280 -D. This means that the caller of Exim was not root.
4282 There is a problem if we were running as the Exim user. The sysadmin may
4283 expect this case to retain privilege because "the binary was called by the
4284 Exim user", but it hasn't, because either the -D option set macros, or the
4285 -C option set a non-trusted configuration file. There are two possibilities:
4287 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4288 to do message deliveries. Thus, the fact that it is running as a
4289 non-privileged user is plausible, and might be wanted in some special
4290 configurations. However, really_exim will have been set false when
4291 privilege was dropped, to stop Exim trying to write to its normal log
4292 files. Therefore, re-enable normal log processing, assuming the sysadmin
4293 has set up the log directory correctly.
4295 (2) If deliver_drop_privilege is not set, the configuration won't work as
4296 apparently intended, and so we log a panic message. In order to retain
4297 root for -C or -D, the caller must either be root or be invoking a
4298 trusted configuration file (when deliver_drop_privilege is false). */
4300 if ( removed_privilege
4301 && (!f.trusted_config || opt_D_used)
4302 && real_uid == exim_uid)
4303 if (deliver_drop_privilege)
4304 f.really_exim = TRUE; /* let logging work normally */
4306 log_write(0, LOG_MAIN|LOG_PANIC,
4307 "exim user lost privilege for using %s option",
4308 f.trusted_config? "-D" : "-C");
4310 /* Start up Perl interpreter if Perl support is configured and there is a
4311 perl_startup option, and the configuration or the command line specifies
4312 initializing starting. Note that the global variables are actually called
4313 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4316 if (perl_start_option != 0)
4317 opt_perl_at_start = (perl_start_option > 0);
4318 if (opt_perl_at_start && opt_perl_startup != NULL)
4321 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4322 if ((errstr = init_perl(opt_perl_startup)))
4323 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4324 opt_perl_started = TRUE;
4326 #endif /* EXIM_PERL */
4328 /* Log the arguments of the call if the configuration file said so. This is
4329 a debugging feature for finding out what arguments certain MUAs actually use.
4330 Don't attempt it if logging is disabled, or if listing variables or if
4331 verifying/testing addresses or expansions. */
4333 if ( (debug_selector & D_any || LOGGING(arguments))
4334 && f.really_exim && !list_options && !checking)
4336 uschar *p = big_buffer;
4337 Ustrcpy(p, US"cwd= (failed)");
4344 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4345 p += Ustrlen(CCS p);
4348 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4350 for (int i = 0; i < argc; i++)
4352 int len = Ustrlen(argv[i]);
4353 const uschar *printing;
4355 if (p + len + 8 >= big_buffer + big_buffer_size)
4357 Ustrcpy(p, US" ...");
4358 log_write(0, LOG_MAIN, "%s", big_buffer);
4359 Ustrcpy(big_buffer, US"...");
4362 printing = string_printing(argv[i]);
4363 if (!*printing) quote = US"\"";
4366 const uschar *pp = printing;
4368 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4370 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4371 (p - big_buffer) - 4), printing, quote);
4374 if (LOGGING(arguments))
4375 log_write(0, LOG_MAIN, "%s", big_buffer);
4377 debug_printf("%s\n", big_buffer);
4380 /* Set the working directory to be the top-level spool directory. We don't rely
4381 on this in the code, which always uses fully qualified names, but it's useful
4382 for core dumps etc. Don't complain if it fails - the spool directory might not
4383 be generally accessible and calls with the -C option (and others) have lost
4384 privilege by now. Before the chdir, we try to ensure that the directory exists.
4387 if (Uchdir(spool_directory) != 0)
4389 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4390 (void) Uchdir(spool_directory);
4393 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4394 alias file. Exim doesn't have such a concept, but this call is screwed into
4395 Sun's YP makefiles. Handle this by calling a configured script, as the real
4396 user who called Exim. The -oA option can be used to pass an argument to the
4401 (void) fclose(config_file);
4402 if (bi_command && *bi_command)
4406 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4407 if (alias_arg) argv[i++] = alias_arg;
4410 setgroups(group_count, group_list);
4411 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4413 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4414 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4416 execv(CS argv[0], (char *const *)argv);
4417 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4421 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4426 /* We moved the admin/trusted check to be immediately after reading the
4427 configuration file. We leave these prints here to ensure that syslog setup,
4428 logfile setup, and so on has already happened. */
4430 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4431 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4433 /* Only an admin user may start the daemon or force a queue run in the default
4434 configuration, but the queue run restriction can be relaxed. Only an admin
4435 user may request that a message be returned to its sender forthwith. Only an
4436 admin user may specify a debug level greater than D_v (because it might show
4437 passwords, etc. in lookup queries). Only an admin user may request a queue
4438 count. Only an admin user can use the test interface to scan for email
4439 (because Exim will be in the spool dir and able to look at mails). */
4443 BOOL debugset = (debug_selector & ~D_v) != 0;
4444 if ( deliver_give_up || f.daemon_listen || malware_test_file
4445 || count_queue && queue_list_requires_admin
4446 || list_queue && queue_list_requires_admin
4447 || queue_interval >= 0 && prod_requires_admin
4448 || queue_name_dest && prod_requires_admin
4449 || debugset && !f.running_in_test_harness
4451 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4454 /* If the real user is not root or the exim uid, the argument for passing
4455 in an open TCP/IP connection for another message is not permitted, nor is
4456 running with the -N option for any delivery action, unless this call to exim is
4457 one that supplied an input message, or we are using a patched exim for
4458 regression testing. */
4460 if ( real_uid != root_uid && real_uid != exim_uid
4461 && ( continue_hostname
4463 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4465 && !f.running_in_test_harness
4467 exim_fail("exim: Permission denied\n");
4469 /* If the caller is not trusted, certain arguments are ignored when running for
4470 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4471 Note that authority for performing certain actions on messages is tested in the
4472 queue_action() function. */
4474 if (!f.trusted_caller && !checking)
4476 sender_host_name = sender_host_address = interface_address =
4477 sender_ident = received_protocol = NULL;
4478 sender_host_port = interface_port = 0;
4479 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4482 /* If a sender host address is set, extract the optional port number off the
4483 end of it and check its syntax. Do the same thing for the interface address.
4484 Exim exits if the syntax is bad. */
4488 if (sender_host_address)
4489 sender_host_port = check_port(sender_host_address);
4490 if (interface_address)
4491 interface_port = check_port(interface_address);
4494 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4497 if (f.trusted_caller)
4499 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4500 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4503 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4506 /* If an SMTP message is being received check to see if the standard input is a
4507 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4508 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4513 union sockaddr_46 inetd_sock;
4514 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4515 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4517 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4518 if (family == AF_INET || family == AF_INET6)
4520 union sockaddr_46 interface_sock;
4521 size = sizeof(interface_sock);
4523 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4524 interface_address = host_ntoa(-1, &interface_sock, NULL,
4527 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4529 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4532 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4533 NULL, &sender_host_port);
4534 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4535 "inetd is not supported when mua_wrapper is set");
4539 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4544 /* If the load average is going to be needed while receiving a message, get it
4545 now for those OS that require the first call to os_getloadavg() to be done as
4546 root. There will be further calls later for each message received. */
4548 #ifdef LOAD_AVG_NEEDS_ROOT
4549 if ( receiving_message
4550 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4551 load_average = OS_GETLOADAVG();
4554 /* The queue_only configuration option can be overridden by -odx on the command
4555 line, except that if queue_only_override is false, queue_only cannot be unset
4556 from the command line. */
4558 if (queue_only_set && (queue_only_override || arg_queue_only))
4559 queue_only = arg_queue_only;
4561 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4564 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4565 if (arg_smtp_receive_timeout >= 0)
4566 smtp_receive_timeout = arg_smtp_receive_timeout;
4568 /* If Exim was started with root privilege, unless we have already removed the
4569 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4570 except when starting the daemon or doing some kind of delivery or address
4571 testing (-bt). These are the only cases when root need to be retained. We run
4572 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4573 retained only for starting the daemon. We always do the initgroups() in this
4574 situation (controlled by the TRUE below), in order to be as close as possible
4575 to the state Exim usually runs in. */
4577 if ( !unprivileged /* originally had root AND */
4578 && !removed_privilege /* still got root AND */
4579 && !f.daemon_listen /* not starting the daemon */
4580 && queue_interval <= 0 /* (either kind of daemon) */
4581 && ( /* AND EITHER */
4582 deliver_drop_privilege /* requested unprivileged */
4584 queue_interval < 0 /* not running the queue */
4585 && ( msg_action_arg < 0 /* and */
4586 || msg_action != MSG_DELIVER /* not delivering */
4588 && (!checking || !f.address_test_mode) /* not address checking */
4589 && !rcpt_verify_quota /* and not quota checking */
4591 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4593 /* When we are retaining a privileged uid, we still change to the exim gid. */
4598 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4599 rv = setgid(exim_gid);
4600 /* Impact of failure is that some stuff might end up with an incorrect group.
4601 We track this for failures from root, since any attempt to change privilege
4602 by root should succeed and failures should be examined. For non-root,
4603 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4604 no need to complain then. */
4606 if (!(unprivileged || removed_privilege))
4607 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4610 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4611 (long int)exim_gid, strerror(errno));
4615 /* Handle a request to scan a file for malware */
4616 if (malware_test_file)
4618 #ifdef WITH_CONTENT_SCAN
4620 set_process_info("scanning file for malware");
4621 if ((result = malware_in_file(malware_test_file)) == FAIL)
4623 printf("No malware found.\n");
4628 printf("Malware lookup returned non-okay/fail: %d\n", result);
4632 printf("Malware found: %s\n", malware_name);
4634 printf("Malware scan detected malware of unknown name.\n");
4636 printf("Malware scanning not enabled at compile time.\n");
4641 /* Handle a request to list the delivery queue */
4645 set_process_info("listing the queue");
4646 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4650 /* Handle a request to count the delivery queue */
4654 set_process_info("counting the queue");
4655 fprintf(stdout, "%u\n", queue_count());
4659 /* Handle actions on specific messages, except for the force delivery and
4660 message load actions, which are done below. Some actions take a whole list of
4661 message ids, which are known to continue up to the end of the arguments. Others
4662 take a single message id and then operate on the recipients list. */
4664 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4666 int yield = EXIT_SUCCESS;
4667 set_process_info("acting on specified messages");
4669 /* ACL definitions may be needed when removing a message (-Mrm) because
4670 event_action gets expanded */
4672 if (msg_action == MSG_REMOVE)
4674 int old_pool = store_pool;
4675 store_pool = POOL_CONFIG;
4677 store_pool = old_pool;
4678 store_writeprotect(POOL_CONFIG);
4681 if (!one_msg_action)
4683 for (i = msg_action_arg; i < argc; i++)
4684 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4685 yield = EXIT_FAILURE;
4688 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4689 default: printf("\n"); break;
4693 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4694 recipients_arg)) yield = EXIT_FAILURE;
4698 /* We used to set up here to skip reading the ACL section, on
4699 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4700 Now, since the intro of the ${acl } expansion, ACL definitions may be
4701 needed in transports so we lost the optimisation. */
4704 int old_pool = store_pool;
4705 #ifdef MEASURE_TIMING
4707 (void)gettimeofday(&t0, NULL);
4710 store_pool = POOL_CONFIG;
4712 store_pool = old_pool;
4714 /* -be can add macro definitions, needing to link to the macro structure
4715 chain. Otherwise, make the memory used for config data readonly. */
4717 if (!expansion_test)
4718 store_writeprotect(POOL_CONFIG);
4720 #ifdef MEASURE_TIMING
4721 report_time_since(&t0, US"readconf_rest (delta)");
4725 /* Handle a request to check quota */
4726 if (rcpt_verify_quota)
4727 if (real_uid != root_uid && real_uid != exim_uid)
4728 exim_fail("exim: Permission denied\n");
4729 else if (recipients_arg >= argc)
4730 exim_fail("exim: missing recipient for quota check\n");
4733 verify_quota(argv[recipients_arg]);
4734 exim_exit(EXIT_SUCCESS);
4737 /* Handle the -brt option. This is for checking out retry configurations.
4738 The next three arguments are a domain name or a complete address, and
4739 optionally two error numbers. All it does is to call the function that
4740 scans the retry configuration data. */
4742 if (test_retry_arg >= 0)
4744 retry_config *yield;
4745 int basic_errno = 0;
4747 const uschar *s1, *s2;
4749 if (test_retry_arg >= argc)
4751 printf("-brt needs a domain or address argument\n");
4752 exim_exit(EXIT_FAILURE);
4754 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4757 /* If the first argument contains no @ and no . it might be a local user
4758 or it might be a single-component name. Treat as a domain. */
4760 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4762 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4763 "being \ntreated as a one-component domain, not as a local part.\n\n",
4767 /* There may be an optional second domain arg. */
4769 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4770 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4772 /* The final arg is an error name */
4774 if (test_retry_arg < argc)
4776 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4778 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4781 printf("%s\n", CS error);
4782 return EXIT_FAILURE;
4785 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4786 code > 100 as an error is for matching codes to the decade. Turn them into
4787 a real error code, off the decade. */
4789 if (basic_errno == ERRNO_MAIL4XX ||
4790 basic_errno == ERRNO_RCPT4XX ||
4791 basic_errno == ERRNO_DATA4XX)
4793 int code = (more_errno >> 8) & 255;
4795 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4796 else if (code > 100)
4797 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4801 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4802 printf("No retry information found\n");
4805 more_errno = yield->more_errno;
4806 printf("Retry rule: %s ", yield->pattern);
4808 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4810 printf("quota%s%s ",
4811 (more_errno > 0)? "_" : "",
4812 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4814 else if (yield->basic_errno == ECONNREFUSED)
4816 printf("refused%s%s ",
4817 (more_errno > 0)? "_" : "",
4818 (more_errno == 'M')? "MX" :
4819 (more_errno == 'A')? "A" : "");
4821 else if (yield->basic_errno == ETIMEDOUT)
4824 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4826 if (more_errno != 0) printf("_%s",
4827 (more_errno == 'M')? "MX" : "A");
4830 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4831 printf("auth_failed ");
4834 for (retry_rule * r = yield->rules; r; r = r->next)
4836 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4837 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4843 printf(",%d.", x/1000);
4857 exim_exit(EXIT_SUCCESS);
4860 /* Handle a request to list one or more configuration options */
4861 /* If -n was set, we suppress some information */
4866 set_process_info("listing variables");
4867 if (recipients_arg >= argc)
4868 fail = !readconf_print(US"all", NULL, flag_n);
4869 else for (i = recipients_arg; i < argc; i++)
4872 (Ustrcmp(argv[i], "router") == 0 ||
4873 Ustrcmp(argv[i], "transport") == 0 ||
4874 Ustrcmp(argv[i], "authenticator") == 0 ||
4875 Ustrcmp(argv[i], "macro") == 0 ||
4876 Ustrcmp(argv[i], "environment") == 0))
4878 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4882 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4884 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4889 set_process_info("listing config");
4890 exim_exit(readconf_print(US"config", NULL, flag_n)
4891 ? EXIT_SUCCESS : EXIT_FAILURE);
4895 /* Initialise subsystems as required. */
4899 /* Handle a request to deliver one or more messages that are already on the
4900 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4901 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4903 Delivery of specific messages is typically used for a small number when
4904 prodding by hand (when the option forced_delivery will be set) or when
4905 re-execing to regain root privilege. Each message delivery must happen in a
4906 separate process, so we fork a process for each one, and run them sequentially
4907 so that debugging output doesn't get intertwined, and to avoid spawning too
4908 many processes if a long list is given. However, don't fork for the last one;
4909 this saves a process in the common case when Exim is called to deliver just one
4912 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4914 if (prod_requires_admin && !f.admin_user)
4916 fprintf(stderr, "exim: Permission denied\n");
4917 exim_exit(EXIT_FAILURE);
4919 set_process_info("delivering specified messages");
4920 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4921 for (i = msg_action_arg; i < argc; i++)
4925 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4926 that runs into a later copy into the untainted global message_id[] */
4927 /*XXX Do we need a length limit check here? */
4929 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4930 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4932 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4933 exim_underbar_exit(EXIT_SUCCESS);
4937 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4939 exim_exit(EXIT_FAILURE);
4943 exim_exit(EXIT_SUCCESS);
4947 /* If only a single queue run is requested, without SMTP listening, we can just
4948 turn into a queue runner, with an optional starting message id. */
4950 if (queue_interval == 0 && !f.daemon_listen)
4952 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4953 start_queue_run_id ? US" starting at " : US"",
4954 start_queue_run_id ? start_queue_run_id: US"",
4955 stop_queue_run_id ? US" stopping at " : US"",
4956 stop_queue_run_id ? stop_queue_run_id : US"");
4958 set_process_info("running the '%s' queue (single queue run)", queue_name);
4960 set_process_info("running the queue (single queue run)");
4961 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4962 exim_exit(EXIT_SUCCESS);
4966 /* Find the login name of the real user running this process. This is always
4967 needed when receiving a message, because it is written into the spool file. It
4968 may also be used to construct a from: or a sender: header, and in this case we
4969 need the user's full name as well, so save a copy of it, checked for RFC822
4970 syntax and munged if necessary, if it hasn't previously been set by the -F
4971 argument. We may try to get the passwd entry more than once, in case NIS or
4972 other delays are in evidence. Save the home directory for use in filter testing
4977 if ((pw = getpwuid(real_uid)) != NULL)
4979 originator_login = string_copy(US pw->pw_name);
4980 originator_home = string_copy(US pw->pw_dir);
4982 /* If user name has not been set by -F, set it from the passwd entry
4983 unless -f has been used to set the sender address by a trusted user. */
4985 if (!originator_name)
4987 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4989 uschar *name = US pw->pw_gecos;
4990 uschar *amp = Ustrchr(name, '&');
4993 /* Most Unix specify that a '&' character in the gecos field is
4994 replaced by a copy of the login name, and some even specify that
4995 the first character should be upper cased, so that's what we do. */
5000 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5001 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5002 buffer[loffset] = toupper(buffer[loffset]);
5006 /* If a pattern for matching the gecos field was supplied, apply
5007 it and then expand the name string. */
5009 if (gecos_pattern && gecos_name)
5011 const pcre2_code *re;
5012 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5014 if (regex_match_and_setup(re, name, 0, -1))
5016 uschar *new_name = expand_string(gecos_name);
5020 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5021 "gecos field \"%s\"\n", new_name, name);
5024 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5025 "\"%s\": %s\n", gecos_name, expand_string_message);
5027 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5028 "gecos field \"%s\"\n", gecos_pattern, name);
5029 store_free((void *)re);
5031 originator_name = string_copy(name);
5034 /* A trusted caller has used -f but not -F */
5036 else originator_name = US"";
5039 /* Break the retry loop */
5044 if (++i > finduser_retries) break;
5048 /* If we cannot get a user login, log the incident and give up, unless the
5049 configuration specifies something to use. When running in the test harness,
5050 any setting of unknown_login overrides the actual name. */
5052 if (!originator_login || f.running_in_test_harness)
5056 originator_login = expand_string(unknown_login);
5057 if (!originator_name && unknown_username)
5058 originator_name = expand_string(unknown_username);
5059 if (!originator_name) originator_name = US"";
5061 if (!originator_login)
5062 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5066 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5069 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5071 /* If a message is created by this call of Exim, the uid/gid of its originator
5072 are those of the caller. These values are overridden if an existing message is
5073 read in from the spool. */
5075 originator_uid = real_uid;
5076 originator_gid = real_gid;
5078 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5079 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5081 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5082 returns. We leave this till here so that the originator_ fields are available
5083 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5086 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5090 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5091 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5092 "mua_wrapper is set");
5095 # ifndef DISABLE_TLS
5096 /* This also checks that the library linkage is working and we can call
5097 routines in it, so call even if tls_require_ciphers is unset */
5099 # ifdef MEASURE_TIMING
5101 (void)gettimeofday(&t0, NULL);
5103 if (!tls_dropprivs_validate_require_cipher(FALSE))
5105 # ifdef MEASURE_TIMING
5106 report_time_since(&t0, US"validate_ciphers (delta)");
5114 /* If the sender ident has not been set (by a trusted caller) set it to
5115 the caller. This will get overwritten below for an inetd call. If a trusted
5116 caller has set it empty, unset it. */
5118 if (!sender_ident) sender_ident = originator_login;
5119 else if (!*sender_ident) sender_ident = NULL;
5121 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5122 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5123 originator_* variables set. */
5125 if (test_rewrite_arg >= 0)
5127 f.really_exim = FALSE;
5128 if (test_rewrite_arg >= argc)
5130 printf("-brw needs an address argument\n");
5131 exim_exit(EXIT_FAILURE);
5133 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5134 exim_exit(EXIT_SUCCESS);
5137 /* A locally-supplied message is considered to be coming from a local user
5138 unless a trusted caller supplies a sender address with -f, or is passing in the
5139 message via SMTP (inetd invocation or otherwise). */
5141 if ( !sender_address && !smtp_input
5142 || !f.trusted_caller && filter_test == FTEST_NONE)
5144 f.sender_local = TRUE;
5146 /* A trusted caller can supply authenticated_sender and authenticated_id
5147 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5148 defaults except when host checking. */
5150 if (!authenticated_sender && !host_checking)
5151 authenticated_sender = string_sprintf("%s@%s", originator_login,
5152 qualify_domain_sender);
5153 if (!authenticated_id && !host_checking)
5154 authenticated_id = originator_login;
5157 /* Trusted callers are always permitted to specify the sender address.
5158 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5159 is specified is the empty address. However, if a trusted caller does not
5160 specify a sender address for SMTP input, we leave sender_address unset. This
5161 causes the MAIL commands to be honoured. */
5163 if ( !smtp_input && !sender_address
5164 || !receive_check_set_sender(sender_address))
5166 /* Either the caller is not permitted to set a general sender, or this is
5167 non-SMTP input and the trusted caller has not set a sender. If there is no
5168 sender, or if a sender other than <> is set, override with the originator's
5169 login (which will get qualified below), except when checking things. */
5171 if ( !sender_address /* No sender_address set */
5173 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5174 !checking)) /* Not running tests, including filter tests */
5176 sender_address = originator_login;
5177 f.sender_address_forced = FALSE;
5178 sender_address_domain = 0;
5182 /* Remember whether an untrusted caller set the sender address */
5184 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5186 /* Ensure that the sender address is fully qualified unless it is the empty
5187 address, which indicates an error message, or doesn't exist (root caller, smtp
5188 interface, no -f argument). */
5190 if (sender_address && *sender_address && sender_address_domain == 0)
5191 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5192 qualify_domain_sender);
5194 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5196 /* Handle a request to verify a list of addresses, or test them for delivery.
5197 This must follow the setting of the sender address, since routers can be
5198 predicated upon the sender. If no arguments are given, read addresses from
5199 stdin. Set debug_level to at least D_v to get full output for address testing.
5202 if (verify_address_mode || f.address_test_mode)
5205 int flags = vopt_qualify;
5207 if (verify_address_mode)
5209 if (!verify_as_sender) flags |= vopt_is_recipient;
5210 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5215 flags |= vopt_is_recipient;
5216 debug_selector |= D_v;
5217 debug_file = stderr;
5218 debug_fd = fileno(debug_file);
5219 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5222 if (recipients_arg < argc)
5223 while (recipients_arg < argc)
5225 /* Supplied addresses are tainted since they come from a user */
5226 uschar * s = string_copy_taint(
5227 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5231 BOOL finished = FALSE;
5232 uschar *ss = parse_find_address_end(s, FALSE);
5233 if (*ss == ',') *ss = 0; else finished = TRUE;
5234 test_address(s, flags, &exit_value);
5237 while (*++s == ',' || isspace(*s)) ;
5243 uschar * s = get_stdinput(NULL, NULL);
5245 test_address(string_copy_taint(
5246 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5248 flags, &exit_value);
5252 exim_exit(exit_value);
5255 /* Handle expansion checking. Either expand items on the command line, or read
5256 from stdin if there aren't any. If -Mset was specified, load the message so
5257 that its variables can be used, but restrict this facility to admin users.
5258 Otherwise, if -bem was used, read a message from stdin. */
5262 dns_init(FALSE, FALSE, FALSE);
5263 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5267 exim_fail("exim: permission denied\n");
5268 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5269 /* Checking the length of the ID is sufficient to validate it.
5270 Get an untainted version so file opens can be done. */
5271 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5273 spoolname = string_sprintf("%s-H", message_id);
5274 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5275 printf ("Failed to load message datafile %s\n", message_id);
5276 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5277 printf ("Failed to load message %s\n", message_id);
5280 /* Read a test message from a file. We fudge it up to be on stdin, saving
5281 stdin itself for later reading of expansion strings. */
5283 else if (expansion_test_message)
5285 int save_stdin = dup(0);
5286 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5288 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5291 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5292 message_ended = END_NOTENDED;
5293 read_message_body(receive_msg(extract_recipients));
5294 message_linecount += body_linecount;
5295 (void)dup2(save_stdin, 0);
5296 (void)close(save_stdin);
5297 clearerr(stdin); /* Required by Darwin */
5300 /* Only admin users may see config-file macros this way */
5302 if (!f.admin_user) macros_user = macros = mlast = NULL;
5304 /* Allow $recipients for this testing */
5306 f.enable_dollar_recipients = TRUE;
5308 /* Expand command line items */
5310 if (recipients_arg < argc)
5311 while (recipients_arg < argc)
5312 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5318 char *(*fn_readline)(const char *) = NULL;
5319 void (*fn_addhist)(const char *) = NULL;
5323 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5326 while (s = get_stdinput(fn_readline, fn_addhist))
5327 expansion_test_line(s);
5330 if (dlhandle) dlclose(dlhandle);
5334 /* The data file will be open after -Mset */
5336 if (deliver_datafile >= 0)
5338 (void)close(deliver_datafile);
5339 deliver_datafile = -1;
5342 exim_exit(EXIT_SUCCESS);
5346 /* The active host name is normally the primary host name, but it can be varied
5347 for hosts that want to play several parts at once. We need to ensure that it is
5348 set for host checking, and for receiving messages. */
5350 smtp_active_hostname = primary_hostname;
5351 if (raw_active_hostname != NULL)
5353 uschar *nah = expand_string(raw_active_hostname);
5356 if (!f.expand_string_forcedfail)
5357 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5358 "(smtp_active_hostname): %s", raw_active_hostname,
5359 expand_string_message);
5361 else if (nah[0] != 0) smtp_active_hostname = nah;
5364 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5365 given IP address so that the blocking and relay configuration can be tested.
5366 Unless a sender_ident was set by -oMt, we discard it (the default is the
5367 caller's login name). An RFC 1413 call is made only if we are running in the
5368 test harness and an incoming interface and both ports are specified, because
5369 there is no TCP/IP call to find the ident for. */
5376 if (!sender_ident_set)
5378 sender_ident = NULL;
5379 if (f.running_in_test_harness && sender_host_port
5380 && interface_address && interface_port)
5381 verify_get_ident(1223); /* note hardwired port number */
5384 /* In case the given address is a non-canonical IPv6 address, canonicalize
5385 it. The code works for both IPv4 and IPv6, as it happens. */
5387 size = host_aton(sender_host_address, x);
5388 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5389 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5391 /* Now set up for testing */
5393 host_build_sender_fullhost();
5397 f.sender_local = FALSE;
5398 f.sender_host_notsocket = TRUE;
5399 debug_file = stderr;
5400 debug_fd = fileno(debug_file);
5401 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5402 "**** but without any ident (RFC 1413) callback.\n"
5403 "**** This is not for real!\n\n",
5404 sender_host_address);
5406 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5407 if (verify_check_host(&hosts_connection_nolog) == OK)
5409 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5410 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5412 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5414 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5415 because a log line has already been written for all its failure exists
5416 (usually "connection refused: <reason>") and writing another one is
5417 unnecessary clutter. */
5419 if (smtp_start_session())
5422 for (; (reset_point = store_mark()); store_reset(reset_point))
5424 if (smtp_setup_msg() <= 0) break;
5425 if (!receive_msg(FALSE)) break;
5427 return_path = sender_address = NULL;
5428 dnslist_domain = dnslist_matched = NULL;
5429 #ifndef DISABLE_DKIM
5430 dkim_cur_signer = NULL;
5433 deliver_localpart_orig = NULL;
5434 deliver_domain_orig = NULL;
5435 callout_address = sending_ip_address = NULL;
5436 deliver_localpart_data = deliver_domain_data =
5437 recipient_data = sender_data = NULL;
5438 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5442 exim_exit(EXIT_SUCCESS);
5446 /* Arrange for message reception if recipients or SMTP were specified;
5447 otherwise complain unless a version print (-bV) happened or this is a filter
5448 verification test or info dump.
5449 In the former case, show the configuration file name. */
5451 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5453 if (version_printed)
5455 if (Ustrchr(config_main_filelist, ':'))
5456 printf("Configuration file search path is %s\n", config_main_filelist);
5457 printf("Configuration file is %s\n", config_main_filename);
5458 return EXIT_SUCCESS;
5461 if (info_flag != CMDINFO_NONE)
5463 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5464 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5467 if (filter_test == FTEST_NONE)
5468 exim_usage(called_as);
5472 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5473 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5474 that we are not called from inetd, because that is rejected above. The
5475 following configuration settings are forced here:
5477 (1) Synchronous delivery (-odi)
5478 (2) Errors to stderr (-oep == -oeq)
5479 (3) No parallel remote delivery
5480 (4) Unprivileged delivery
5482 We don't force overall queueing options because there are several of them;
5483 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5484 to override any SMTP queueing. */
5488 f.synchronous_delivery = TRUE;
5489 arg_error_handling = ERRORS_STDERR;
5490 remote_max_parallel = 1;
5491 deliver_drop_privilege = TRUE;
5492 f.queue_smtp = FALSE;
5493 queue_smtp_domains = NULL;
5495 message_utf8_downconvert = -1; /* convert-if-needed */
5500 /* Prepare to accept one or more new messages on the standard input. When a
5501 message has been read, its id is returned in message_id[]. If doing immediate
5502 delivery, we fork a delivery process for each received message, except for the
5503 last one, where we can save a process switch.
5505 It is only in non-smtp mode that error_handling is allowed to be changed from
5506 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5507 sendmail error modes other than -oem ever actually used? Later: yes.) */
5509 if (!smtp_input) error_handling = arg_error_handling;
5511 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5512 logging being sent down the socket and make an identd call to get the
5515 else if (f.is_inetd)
5517 (void)fclose(stderr);
5518 exim_nullstd(); /* Re-open to /dev/null */
5519 verify_get_ident(IDENT_PORT);
5520 host_build_sender_fullhost();
5521 set_process_info("handling incoming connection from %s via inetd",
5525 /* If the sender host address has been set, build sender_fullhost if it hasn't
5526 already been done (which it will have been for inetd). This caters for the
5527 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5528 so that the test for IP options is skipped for -bs input. */
5530 if (sender_host_address && !sender_fullhost)
5532 host_build_sender_fullhost();
5533 set_process_info("handling incoming connection from %s via -oMa",
5535 f.sender_host_notsocket = TRUE;
5538 /* Otherwise, set the sender host as unknown except for inetd calls. This
5539 prevents host checking in the case of -bs not from inetd and also for -bS. */
5541 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5543 /* If stdout does not exist, then dup stdin to stdout. This can happen
5544 if exim is started from inetd. In this case fd 0 will be set to the socket,
5545 but fd 1 will not be set. This also happens for passed SMTP channels. */
5547 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5549 /* Set up the incoming protocol name and the state of the program. Root is
5550 allowed to force received protocol via the -oMr option above. If we have come
5551 via inetd, the process info has already been set up. We don't set
5552 received_protocol here for smtp input, as it varies according to
5553 batch/HELO/EHLO/AUTH/TLS. */
5557 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5558 smtp_batched_input? "batched " : "",
5559 sender_address ? sender_address : originator_login);
5563 int old_pool = store_pool;
5564 store_pool = POOL_PERM;
5565 if (!received_protocol)
5566 received_protocol = string_sprintf("local%s", called_as);
5567 store_pool = old_pool;
5568 set_process_info("accepting a local non-SMTP message from <%s>",
5572 /* Initialize the session_local_queue-only flag (this will be ignored if
5573 mua_wrapper is set) */
5576 session_local_queue_only = queue_only;
5578 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5579 the spool if so configured. On failure, we must not attempt to send an error
5580 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5581 error code is given.) */
5583 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5584 exim_fail("exim: insufficient disk space\n");
5586 /* If this is smtp input of any kind, real or batched, handle the start of the
5589 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5590 because a log line has already been written for all its failure exists
5591 (usually "connection refused: <reason>") and writing another one is
5592 unnecessary clutter. */
5598 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5599 if (verify_check_host(&hosts_connection_nolog) == OK)
5601 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5602 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5604 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5605 if (!smtp_start_session())
5608 exim_exit(EXIT_SUCCESS);
5612 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5613 (we handle buferring so as to have visibility of fill level). */
5617 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5618 if (expand_string_message)
5619 if (thismessage_size_limit == -1)
5620 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5621 "message_size_limit: %s", expand_string_message);
5623 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5624 "message_size_limit: %s", expand_string_message);
5626 setvbuf(stdin, NULL, _IONBF, 0);
5629 /* Loop for several messages when reading SMTP input. If we fork any child
5630 processes, we don't want to wait for them unless synchronous delivery is
5631 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5632 same as SIG_DFL, despite the fact that documentation often lists the default as
5633 "ignore". This is a confusing area. This is what I know:
5635 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5636 processes that complete simply to go away without ever becoming defunct. You
5637 can't then wait for them - but we don't want to wait for them in the
5638 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5639 happen for all OS (e.g. *BSD is different).
5641 But that's not the end of the story. Some (many? all?) systems have the
5642 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5643 has by default, so it seems that the difference is merely one of default
5644 (compare restarting vs non-restarting signals).
5646 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5647 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5648 of the loop below. Paranoia rules.
5650 February 2003: That's *still* not the end of the story. There are now versions
5651 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5652 process then calls waitpid(), a grumble is written to the system log, because
5653 this is logically inconsistent. In other words, it doesn't like the paranoia.
5654 As a consequence of this, the waitpid() below is now excluded if we are sure
5655 that SIG_IGN works. */
5657 if (!f.synchronous_delivery)
5660 struct sigaction act;
5661 act.sa_handler = SIG_IGN;
5662 sigemptyset(&(act.sa_mask));
5663 act.sa_flags = SA_NOCLDWAIT;
5664 sigaction(SIGCHLD, &act, NULL);
5666 signal(SIGCHLD, SIG_IGN);
5670 /* Save the current store pool point, for resetting at the start of
5671 each message, and save the real sender address, if any. */
5673 real_sender_address = sender_address;
5675 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5676 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5679 for (BOOL more = TRUE; more; )
5681 rmark reset_point = store_mark();
5684 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5685 input and build the recipients list, before calling receive_msg() to read the
5686 message proper. Whatever sender address is given in the SMTP transaction is
5687 often ignored for local senders - we use the actual sender, which is normally
5688 either the underlying user running this process or a -f argument provided by
5689 a trusted caller. It is saved in real_sender_address. The test for whether to
5690 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5695 if ((rc = smtp_setup_msg()) > 0)
5697 if (real_sender_address != NULL &&
5698 !receive_check_set_sender(sender_address))
5700 sender_address = raw_sender = real_sender_address;
5701 sender_address_unrewritten = NULL;
5704 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5705 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5706 the very end. The result of the ACL is ignored (as for other non-SMTP
5707 messages). It is run for its potential side effects. */
5709 if (smtp_batched_input && acl_not_smtp_start != NULL)
5711 uschar *user_msg, *log_msg;
5712 f.enable_dollar_recipients = TRUE;
5713 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5714 &user_msg, &log_msg);
5715 f.enable_dollar_recipients = FALSE;
5718 /* Now get the data for the message */
5720 more = receive_msg(extract_recipients);
5723 cancel_cutthrough_connection(TRUE, US"receive dropped");
5724 if (more) goto MORELOOP;
5725 smtp_log_no_mail(); /* Log no mail if configured */
5726 exim_exit(EXIT_FAILURE);
5731 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5732 smtp_log_no_mail(); /* Log no mail if configured */
5733 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5737 /* In the non-SMTP case, we have all the information from the command
5738 line, but must process it in case it is in the more general RFC822
5739 format, and in any case, to detect syntax errors. Also, it appears that
5740 the use of comma-separated lists as single arguments is common, so we
5741 had better support them. */
5746 int count = argc - recipients_arg;
5747 uschar **list = argv + recipients_arg;
5749 /* These options cannot be changed dynamically for non-SMTP messages */
5751 f.active_local_sender_retain = local_sender_retain;
5752 f.active_local_from_check = local_from_check;
5754 /* Save before any rewriting */
5756 raw_sender = string_copy(sender_address);
5758 /* Loop for each argument (supplied by user hence tainted) */
5760 for (int i = 0; i < count; i++)
5762 int start, end, domain;
5764 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5765 * We'll still want to cap it to something, just in case. */
5766 uschar * s = string_copy_taint(
5767 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5770 /* Loop for each comma-separated address */
5774 BOOL finished = FALSE;
5776 uschar *ss = parse_find_address_end(s, FALSE);
5778 if (*ss == ',') *ss = 0; else finished = TRUE;
5780 /* Check max recipients - if -t was used, these aren't recipients */
5782 if (recipients_max > 0 && ++rcount > recipients_max &&
5783 !extract_recipients)
5784 if (error_handling == ERRORS_STDERR)
5786 fprintf(stderr, "exim: too many recipients\n");
5787 exim_exit(EXIT_FAILURE);
5791 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5792 errors_sender_rc : EXIT_FAILURE;
5796 BOOL b = allow_utf8_domains;
5797 allow_utf8_domains = TRUE;
5800 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5804 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5805 else allow_utf8_domains = b;
5810 if (domain == 0 && !f.allow_unqualified_recipient)
5813 errmess = US"unqualified recipient address not allowed";
5817 if (error_handling == ERRORS_STDERR)
5819 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5820 string_printing(list[i]), errmess);
5821 exim_exit(EXIT_FAILURE);
5827 eblock.text1 = string_printing(list[i]);
5828 eblock.text2 = errmess;
5830 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5831 errors_sender_rc : EXIT_FAILURE;
5834 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5837 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5841 /* Show the recipients when debugging */
5845 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5846 if (recipients_list)
5848 debug_printf("Recipients:\n");
5849 for (int i = 0; i < recipients_count; i++)
5850 debug_printf(" %s\n", recipients_list[i].address);
5854 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5855 ignored; rejecting here would just add complication, and it can just as
5856 well be done later. Allow $recipients to be visible in the ACL. */
5858 if (acl_not_smtp_start)
5860 uschar *user_msg, *log_msg;
5861 f.enable_dollar_recipients = TRUE;
5862 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5863 &user_msg, &log_msg);
5864 f.enable_dollar_recipients = FALSE;
5867 /* Pause for a while waiting for input. If none received in that time,
5868 close the logfile, if we had one open; then if we wait for a long-running
5869 datasource (months, in one use-case) log rotation will not leave us holding
5872 if (!receive_timeout)
5873 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5876 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5877 will just read the headers for the message, and not write anything onto the
5880 message_ended = END_NOTENDED;
5881 more = receive_msg(extract_recipients);
5883 /* more is always FALSE here (not SMTP message) when reading a message
5884 for real; when reading the headers of a message for filter testing,
5885 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5887 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5888 } /* Non-SMTP message reception */
5890 /* If this is a filter testing run, there are headers in store, but
5891 no message on the spool. Run the filtering code in testing mode, setting
5892 the domain to the qualify domain and the local part to the current user,
5893 unless they have been set by options. The prefix and suffix are left unset
5894 unless specified. The the return path is set to to the sender unless it has
5895 already been set from a return-path header in the message. */
5897 if (filter_test != FTEST_NONE)
5899 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5900 deliver_domain_orig = deliver_domain;
5901 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5902 deliver_localpart_orig = deliver_localpart;
5903 deliver_localpart_prefix = US ftest_prefix;
5904 deliver_localpart_suffix = US ftest_suffix;
5905 deliver_home = originator_home;
5909 printf("Return-path copied from sender\n");
5910 return_path = string_copy(sender_address);
5913 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5914 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5916 receive_add_recipient(
5917 string_sprintf("%s%s%s@%s",
5918 ftest_prefix ? ftest_prefix : US"",
5920 ftest_suffix ? ftest_suffix : US"",
5921 deliver_domain), -1);
5923 printf("Recipient = %s\n", recipients_list[0].address);
5924 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5925 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5927 if (chdir("/")) /* Get away from wherever the user is running this from */
5929 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5930 exim_exit(EXIT_FAILURE);
5933 /* Now we run either a system filter test, or a user filter test, or both.
5934 In the latter case, headers added by the system filter will persist and be
5935 available to the user filter. We need to copy the filter variables
5938 if (filter_test & FTEST_SYSTEM)
5939 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5940 exim_exit(EXIT_FAILURE);
5942 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5944 if (filter_test & FTEST_USER)
5945 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5946 exim_exit(EXIT_FAILURE);
5948 exim_exit(EXIT_SUCCESS);
5951 /* Else act on the result of message reception. We should not get here unless
5952 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5953 will be TRUE. If it is not, check on the number of messages received in this
5956 if ( !session_local_queue_only
5957 && smtp_accept_queue_per_connection > 0
5958 && receive_messagecount > smtp_accept_queue_per_connection)
5960 session_local_queue_only = TRUE;
5961 queue_only_reason = 2;
5964 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5965 and queue_only_load is set, check that the load average is below it. If it is
5966 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5967 default), we put the whole session into queue_only mode. It then remains this
5968 way for any subsequent messages on the same SMTP connection. This is a
5969 deliberate choice; even though the load average may fall, it doesn't seem
5970 right to deliver later messages on the same call when not delivering earlier
5971 ones. However, there are odd cases where this is not wanted, so this can be
5972 changed by setting queue_only_load_latch false. */
5974 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5975 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5977 queue_only_reason = 3;
5978 if (queue_only_load_latch) session_local_queue_only = TRUE;
5981 /* If running as an MUA wrapper, all queueing options and freezing options
5985 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5987 /* Log the queueing here, when it will get a message id attached, but
5988 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5991 if (local_queue_only)
5993 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5994 switch(queue_only_reason)
5997 log_write(L_delay_delivery,
5998 LOG_MAIN, "no immediate delivery: more than %d messages "
5999 "received in one connection", smtp_accept_queue_per_connection);
6003 log_write(L_delay_delivery,
6004 LOG_MAIN, "no immediate delivery: load average %.2f",
6005 (double)load_average/1000.0);
6010 else if (f.queue_only_policy || f.deliver_freeze)
6011 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6013 /* Else do the delivery unless the ACL or local_scan() called for queue only
6014 or froze the message. Always deliver in a separate process. A fork failure is
6015 not a disaster, as the delivery will eventually happen on a subsequent queue
6016 run. The search cache must be tidied before the fork, as the parent will
6017 do it before exiting. The child will trigger a lookup failure and
6018 thereby defer the delivery if it tries to use (for example) a cached ldap
6019 connection that the parent has called unbind on. */
6026 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6029 close_unwanted(); /* Close unwanted file descriptors and TLS */
6030 exim_nullstd(); /* Ensure std{in,out,err} exist */
6032 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6033 mode, deliver_drop_privilege is forced TRUE). */
6035 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6037 delivery_re_exec(CEE_EXEC_EXIT);
6038 /* Control does not return here. */
6041 /* No need to re-exec */
6043 rc = deliver_message(message_id, FALSE, FALSE);
6045 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6046 ? EXIT_SUCCESS : EXIT_FAILURE);
6051 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6052 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6053 "process: %s", strerror(errno));
6057 release_cutthrough_connection(US"msg passed for delivery");
6059 /* In the parent, wait if synchronous delivery is required. This will
6060 always be the case in MUA wrapper mode. */
6062 if (f.synchronous_delivery)
6065 while (wait(&status) != pid);
6066 if ((status & 0x00ff) != 0)
6067 log_write(0, LOG_MAIN|LOG_PANIC,
6068 "process %d crashed with signal %d while delivering %s",
6069 (int)pid, status & 0x00ff, message_id);
6070 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6075 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6076 automatically reaps children (see comments above the loop), clear away any
6077 finished subprocesses here, in case there are lots of messages coming in
6078 from the same source. */
6080 #ifndef SIG_IGN_WORKS
6081 while (waitpid(-1, NULL, WNOHANG) > 0);
6085 return_path = sender_address = NULL;
6086 authenticated_sender = NULL;
6087 deliver_localpart_orig = NULL;
6088 deliver_domain_orig = NULL;
6089 deliver_host = deliver_host_address = NULL;
6090 dnslist_domain = dnslist_matched = NULL;
6091 #ifdef WITH_CONTENT_SCAN
6092 malware_name = NULL;
6095 callout_address = NULL;
6096 sending_ip_address = NULL;
6097 deliver_localpart_data = deliver_domain_data =
6098 recipient_data = sender_data = NULL;
6101 store_reset(reset_point);
6104 exim_exit(EXIT_SUCCESS); /* Never returns */
6105 return 0; /* To stop compiler warning */