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);
848 /* fail if a length is too long */
850 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
852 if (itemlen <= maxlen)
854 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
855 itemlen, maxlen, description);
859 /* only pass through the string item back to the caller if it's short enough */
860 static inline const uschar *
861 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
863 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
867 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
868 of chown()/fchown(). See src/functions.h for more explanation */
870 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
872 int saved_errno = errno; /* from the preceeding chown call */
874 log_write(0, LOG_MAIN|LOG_PANIC,
875 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
876 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
877 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
879 /* I leave this here, commented, in case the "bug"(?) comes up again.
880 It is not an Exim bug, but we can provide a workaround.
886 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
888 if (buf.st_uid == owner && buf.st_gid == group) return 0;
889 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
891 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
899 /*************************************************
900 * Extract port from host address *
901 *************************************************/
903 /* Called to extract the port from the values given to -oMa and -oMi.
904 It also checks the syntax of the address, and terminates it before the
905 port data when a port is extracted.
908 address the address, with possible port on the end
910 Returns: the port, or zero if there isn't one
911 bombs out on a syntax error
915 check_port(uschar *address)
917 int port = host_address_extract_port(address);
918 if (string_is_ip_address(address, NULL) == 0)
919 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
925 /*************************************************
926 * Test/verify an address *
927 *************************************************/
929 /* This function is called by the -bv and -bt code. It extracts a working
930 address from a full RFC 822 address. This isn't really necessary per se, but it
931 has the effect of collapsing source routes.
935 flags flag bits for verify_address()
936 exit_value to be set for failures
942 test_address(uschar *s, int flags, int *exit_value)
944 int start, end, domain;
945 uschar *parse_error = NULL;
946 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
950 fprintf(stdout, "syntax error: %s\n", parse_error);
955 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
956 -1, -1, NULL, NULL, NULL);
957 if (rc == FAIL) *exit_value = 2;
958 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
964 /*************************************************
965 * Show supported features *
966 *************************************************/
969 show_string(BOOL is_stdout, gstring * g)
971 const uschar * s = string_from_gstring(g);
973 if (is_stdout) fputs(CCS s, stdout);
974 else debug_printf("%s", s);
979 show_db_version(gstring * g)
981 #ifdef DB_VERSION_STRING
984 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
985 g = string_fmt_append(g, " Runtime: %s\n",
986 db_version(NULL, NULL, NULL));
989 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
991 #elif defined(BTREEVERSION) && defined(HASHVERSION)
993 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
995 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
998 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
999 g = string_cat(g, US"Probably ndbm\n");
1000 #elif defined(USE_TDB)
1001 g = string_cat(g, US"Using tdb\n");
1004 g = string_cat(g, US"Probably GDBM (native mode)\n");
1006 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1013 /* This function is called for -bV/--version and for -d to output the optional
1014 features of the current Exim binary.
1016 Arguments: BOOL, true for stdout else debug channel
1021 show_whats_supported(BOOL is_stdout)
1023 rmark reset_point = store_mark();
1026 DEBUG(D_any) {} else g = show_db_version(g);
1028 g = string_cat(g, US"Support for:");
1029 #ifdef SUPPORT_CRYPTEQ
1030 g = string_cat(g, US" crypteq");
1033 g = string_cat(g, US" iconv()");
1036 g = string_cat(g, US" IPv6");
1038 #ifdef HAVE_SETCLASSRESOURCES
1039 g = string_cat(g, US" use_setclassresources");
1042 g = string_cat(g, US" PAM");
1045 g = string_cat(g, US" Perl");
1047 #ifdef EXPAND_DLFUNC
1048 g = string_cat(g, US" Expand_dlfunc");
1050 #ifdef USE_TCP_WRAPPERS
1051 g = string_cat(g, US" TCPwrappers");
1054 g = string_cat(g, US" GnuTLS");
1057 g = string_cat(g, US" OpenSSL");
1059 #ifndef DISABLE_TLS_RESUME
1060 g = string_cat(g, US" TLS_resume");
1062 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1063 g = string_cat(g, US" translate_ip_address");
1065 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1066 g = string_cat(g, US" move_frozen_messages");
1068 #ifdef WITH_CONTENT_SCAN
1069 g = string_cat(g, US" Content_Scanning");
1072 g = string_cat(g, US" DANE");
1074 #ifndef DISABLE_DKIM
1075 g = string_cat(g, US" DKIM");
1077 #ifdef SUPPORT_DMARC
1078 g = string_cat(g, US" DMARC");
1080 #ifndef DISABLE_DNSSEC
1081 g = string_cat(g, US" DNSSEC");
1083 #ifndef DISABLE_EVENT
1084 g = string_cat(g, US" Event");
1087 g = string_cat(g, US" I18N");
1089 #ifndef DISABLE_OCSP
1090 g = string_cat(g, US" OCSP");
1092 #ifndef DISABLE_PIPE_CONNECT
1093 g = string_cat(g, US" PIPECONNECT");
1095 #ifndef DISABLE_PRDR
1096 g = string_cat(g, US" PRDR");
1098 #ifdef SUPPORT_PROXY
1099 g = string_cat(g, US" PROXY");
1101 #ifndef DISABLE_QUEUE_RAMP
1102 g = string_cat(g, US" Queue_Ramp");
1104 #ifdef SUPPORT_SOCKS
1105 g = string_cat(g, US" SOCKS");
1108 g = string_cat(g, US" SPF");
1110 #if defined(SUPPORT_SRS)
1111 g = string_cat(g, US" SRS");
1115 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1117 #ifdef EXPERIMENTAL_ARC
1118 g = string_cat(g, US" Experimental_ARC");
1120 #ifdef EXPERIMENTAL_BRIGHTMAIL
1121 g = string_cat(g, US" Experimental_Brightmail");
1123 #ifdef EXPERIMENTAL_DCC
1124 g = string_cat(g, US" Experimental_DCC");
1126 #ifdef EXPERIMENTAL_DSN_INFO
1127 g = string_cat(g, US" Experimental_DSN_info");
1129 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1130 g = string_cat(g, US" Experimental_ESMTP_Limits");
1132 #ifdef EXPERIMENTAL_QUEUEFILE
1133 g = string_cat(g, US" Experimental_QUEUEFILE");
1135 g = string_cat(g, US"\n");
1137 g = string_cat(g, US"Lookups (built-in):");
1138 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1139 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1141 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1142 g = string_cat(g, US" cdb");
1144 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1145 g = string_cat(g, US" dbm dbmjz dbmnz");
1147 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1148 g = string_cat(g, US" dnsdb");
1150 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1151 g = string_cat(g, US" dsearch");
1153 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1154 g = string_cat(g, US" ibase");
1156 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1157 g = string_cat(g, US" json");
1159 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1160 g = string_cat(g, US" ldap ldapdn ldapm");
1163 g = string_cat(g, US" lmdb");
1165 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1166 g = string_cat(g, US" mysql");
1168 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1169 g = string_cat(g, US" nis nis0");
1171 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1172 g = string_cat(g, US" nisplus");
1174 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1175 g = string_cat(g, US" oracle");
1177 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1178 g = string_cat(g, US" passwd");
1180 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1181 g = string_cat(g, US" pgsql");
1183 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1184 g = string_cat(g, US" redis");
1186 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1187 g = string_cat(g, US" sqlite");
1189 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1190 g = string_cat(g, US" testdb");
1192 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1193 g = string_cat(g, US" whoson");
1195 g = string_cat(g, US"\n");
1197 g = auth_show_supported(g);
1198 g = route_show_supported(g);
1199 g = transport_show_supported(g);
1201 #ifdef WITH_CONTENT_SCAN
1202 g = malware_show_supported(g);
1204 show_string(is_stdout, g); g = NULL;
1206 if (fixed_never_users[0] > 0)
1209 g = string_cat(g, US"Fixed never_users: ");
1210 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1211 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1212 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1215 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1217 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1219 /* Everything else is details which are only worth reporting when debugging.
1220 Perhaps the tls_version_report should move into this too. */
1224 /* clang defines __GNUC__ (at least, for me) so test for it first */
1225 #if defined(__clang__)
1226 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1227 #elif defined(__GNUC__)
1229 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1231 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1234 g = string_cat(g, US"Compiler: <unknown>\n");
1237 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1238 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1239 __GLIBC__, __GLIBC_MINOR__);
1240 if (__GLIBC_PREREQ(2, 1))
1241 g = string_fmt_append(g, " Runtime: %s\n",
1242 gnu_get_libc_version());
1245 g = show_db_version(g);
1248 g = tls_version_report(g);
1251 g = utf8_version_report(g);
1253 #ifdef SUPPORT_DMARC
1254 g = dmarc_version_report(g);
1257 g = spf_lib_version_report(g);
1260 show_string(is_stdout, g);
1263 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1264 if (authi->version_report)
1265 g = (*authi->version_report)(g);
1267 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1268 characters; unless it's an ancient version of PCRE in which case it
1270 #ifndef PCRE_PRERELEASE
1271 # define PCRE_PRERELEASE
1274 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1277 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1278 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1280 PCRE2_MAJOR, PCRE2_MINOR,
1281 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1285 #undef EXPAND_AND_QUOTE
1287 show_string(is_stdout, g);
1291 for (int i = 0; i < lookup_list_count; i++)
1292 if (lookup_list[i]->version_report)
1293 g = lookup_list[i]->version_report(g);
1294 show_string(is_stdout, g);
1297 #ifdef WHITELIST_D_MACROS
1298 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1300 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1302 #ifdef TRUSTED_CONFIG_LIST
1303 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1305 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1309 show_string(is_stdout, g);
1310 store_reset(reset_point);
1314 /*************************************************
1315 * Show auxiliary information about Exim *
1316 *************************************************/
1319 show_exim_information(enum commandline_info request, FILE *stream)
1324 fprintf(stream, "Oops, something went wrong.\n");
1328 "The -bI: flag takes a string indicating which information to provide.\n"
1329 "If the string is not recognised, you'll get this help (on stderr).\n"
1331 " exim -bI:help this information\n"
1332 " exim -bI:dscp list of known dscp value keywords\n"
1333 " exim -bI:sieve list of supported sieve extensions\n"
1337 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1338 fprintf(stream, "%s\n", *pp);
1341 dscp_list_to_stream(stream);
1347 /*************************************************
1348 * Quote a local part *
1349 *************************************************/
1351 /* This function is used when a sender address or a From: or Sender: header
1352 line is being created from the caller's login, or from an authenticated_id. It
1353 applies appropriate quoting rules for a local part.
1355 Argument: the local part
1356 Returns: the local part, quoted if necessary
1360 local_part_quote(uschar *lpart)
1362 BOOL needs_quote = FALSE;
1365 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1367 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1368 (*t != '.' || t == lpart || t[1] == 0);
1371 if (!needs_quote) return lpart;
1373 g = string_catn(NULL, US"\"", 1);
1377 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1380 g = string_cat(g, lpart);
1383 g = string_catn(g, lpart, nq - lpart);
1384 g = string_catn(g, US"\\", 1);
1385 g = string_catn(g, nq, 1);
1389 g = string_catn(g, US"\"", 1);
1390 return string_from_gstring(g);
1396 /*************************************************
1397 * Load readline() functions *
1398 *************************************************/
1400 /* This function is called from testing executions that read data from stdin,
1401 but only when running as the calling user. Currently, only -be does this. The
1402 function loads the readline() function library and passes back the functions.
1403 On some systems, it needs the curses library, so load that too, but try without
1404 it if loading fails. All this functionality has to be requested at build time.
1407 fn_readline_ptr pointer to where to put the readline pointer
1408 fn_addhist_ptr pointer to where to put the addhistory function
1410 Returns: the dlopen handle or NULL on failure
1414 set_readline(char * (**fn_readline_ptr)(const char *),
1415 void (**fn_addhist_ptr)(const char *))
1418 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1420 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1421 if (dlhandle_curses) dlclose(dlhandle_curses);
1425 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1426 * char * readline (const char *prompt);
1427 * void add_history (const char *string);
1429 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1430 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1433 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1441 /*************************************************
1442 * Get a line from stdin for testing things *
1443 *************************************************/
1445 /* This function is called when running tests that can take a number of lines
1446 of input (for example, -be and -bt). It handles continuations and trailing
1447 spaces. And prompting and a blank line output on eof. If readline() is in use,
1448 the arguments are non-NULL and provide the relevant functions.
1451 fn_readline readline function or NULL
1452 fn_addhist addhist function or NULL
1454 Returns: pointer to dynamic memory, or NULL at end of file
1458 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1461 BOOL had_input = FALSE;
1463 if (!fn_readline) { printf("> "); fflush(stdout); }
1465 for (int i = 0;; i++)
1467 uschar buffer[1024];
1471 char *readline_line = NULL;
1474 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1475 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1476 p = US readline_line;
1481 /* readline() not in use */
1484 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1488 /* Handle the line */
1491 ss = p + Ustrlen(p);
1492 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1495 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1497 g = string_catn(g, p, ss - p);
1500 if (fn_readline) free(readline_line);
1503 /* g can only be NULL if ss==p */
1504 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1507 --g->ptr; /* drop the \ */
1510 if (had_input) return g ? string_from_gstring(g) : US"";
1517 /*************************************************
1518 * Output usage information for the program *
1519 *************************************************/
1521 /* This function is called when there are no recipients
1522 or a specific --help argument was added.
1525 progname information on what name we were called by
1527 Returns: DOES NOT RETURN
1531 exim_usage(uschar *progname)
1534 /* Handle specific program invocation variants */
1535 if (Ustrcmp(progname, US"-mailq") == 0)
1537 "mailq - list the contents of the mail queue\n\n"
1538 "For a list of options, see the Exim documentation.\n");
1540 /* Generic usage - we output this whatever happens */
1542 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1543 "not directly from a shell command line. Options and/or arguments control\n"
1544 "what it does when called. For a list of options, see the Exim documentation.\n");
1549 /*************************************************
1550 * Validate that the macros given are okay *
1551 *************************************************/
1553 /* Typically, Exim will drop privileges if macros are supplied. In some
1554 cases, we want to not do so.
1556 Arguments: opt_D_used - true if the commandline had a "-D" option
1557 Returns: true if trusted, false otherwise
1561 macros_trusted(BOOL opt_D_used)
1563 #ifdef WHITELIST_D_MACROS
1564 uschar *whitelisted, *end, *p, **whites;
1565 int white_count, i, n;
1567 BOOL prev_char_item, found;
1572 #ifndef WHITELIST_D_MACROS
1576 /* We only trust -D overrides for some invoking users:
1577 root, the exim run-time user, the optional config owner user.
1578 I don't know why config-owner would be needed, but since they can own the
1579 config files anyway, there's no security risk to letting them override -D. */
1580 if ( ! ((real_uid == root_uid)
1581 || (real_uid == exim_uid)
1582 #ifdef CONFIGURE_OWNER
1583 || (real_uid == config_uid)
1587 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1591 /* Get a list of macros which are whitelisted */
1592 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1593 prev_char_item = FALSE;
1595 for (p = whitelisted; *p != '\0'; ++p)
1597 if (*p == ':' || isspace(*p))
1602 prev_char_item = FALSE;
1605 if (!prev_char_item)
1606 prev_char_item = TRUE;
1613 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1614 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1619 if (i == white_count)
1621 while (*p != '\0' && p < end)
1627 /* The list of commandline macros should be very short.
1628 Accept the N*M complexity. */
1629 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1632 for (uschar ** w = whites; *w; ++w)
1633 if (Ustrcmp(*w, m->name) == 0)
1640 if (!m->replacement)
1642 if ((len = m->replen) == 0)
1644 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1647 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1653 /*************************************************
1654 * Expansion testing *
1655 *************************************************/
1657 /* Expand and print one item, doing macro-processing.
1660 item line for expansion
1664 expansion_test_line(const uschar * line)
1670 Ustrncpy(big_buffer, line, big_buffer_size);
1671 big_buffer[big_buffer_size-1] = '\0';
1672 len = Ustrlen(big_buffer);
1674 (void) macros_expand(0, &len, &dummy_macexp);
1676 if (isupper(big_buffer[0]))
1678 if (macro_read_assignment(big_buffer))
1679 printf("Defined macro '%s'\n", mlast->name);
1681 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1682 printf("%s\n", acl_standalone_setvar(big_buffer+4));
1684 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1685 else printf("Failed: %s\n", expand_string_message);
1690 /*************************************************
1691 * Entry point and high-level code *
1692 *************************************************/
1694 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1695 the appropriate action. All the necessary functions are present in the one
1696 binary. I originally thought one should split it up, but it turns out that so
1697 much of the apparatus is needed in each chunk that one might as well just have
1698 it all available all the time, which then makes the coding easier as well.
1701 argc count of entries in argv
1702 argv argument strings, with argv[0] being the program name
1704 Returns: EXIT_SUCCESS if terminated successfully
1705 EXIT_FAILURE otherwise, except when a message has been sent
1706 to the sender, and -oee was given
1710 main(int argc, char **cargv)
1712 uschar **argv = USS cargv;
1713 int arg_receive_timeout = -1;
1714 int arg_smtp_receive_timeout = -1;
1715 int arg_error_handling = error_handling;
1716 int filter_sfd = -1;
1717 int filter_ufd = -1;
1720 int list_queue_option = 0;
1722 int msg_action_arg = -1;
1723 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1724 int queue_only_reason = 0;
1726 int perl_start_option = 0;
1728 int recipients_arg = argc;
1729 int sender_address_domain = 0;
1730 int test_retry_arg = -1;
1731 int test_rewrite_arg = -1;
1732 gid_t original_egid;
1733 BOOL arg_queue_only = FALSE;
1734 BOOL bi_option = FALSE;
1735 BOOL checking = FALSE;
1736 BOOL count_queue = FALSE;
1737 BOOL expansion_test = FALSE;
1738 BOOL extract_recipients = FALSE;
1739 BOOL flag_G = FALSE;
1740 BOOL flag_n = FALSE;
1741 BOOL forced_delivery = FALSE;
1742 BOOL f_end_dot = FALSE;
1743 BOOL deliver_give_up = FALSE;
1744 BOOL list_queue = FALSE;
1745 BOOL list_options = FALSE;
1746 BOOL list_config = FALSE;
1747 BOOL local_queue_only;
1748 BOOL one_msg_action = FALSE;
1749 BOOL opt_D_used = FALSE;
1750 BOOL queue_only_set = FALSE;
1751 BOOL receiving_message = TRUE;
1752 BOOL sender_ident_set = FALSE;
1753 BOOL session_local_queue_only;
1755 BOOL removed_privilege = FALSE;
1756 BOOL usage_wanted = FALSE;
1757 BOOL verify_address_mode = FALSE;
1758 BOOL verify_as_sender = FALSE;
1759 BOOL rcpt_verify_quota = FALSE;
1760 BOOL version_printed = FALSE;
1761 uschar *alias_arg = NULL;
1762 uschar *called_as = US"";
1763 uschar *cmdline_syslog_name = NULL;
1764 uschar *start_queue_run_id = NULL;
1765 uschar *stop_queue_run_id = NULL;
1766 uschar *expansion_test_message = NULL;
1767 const uschar *ftest_domain = NULL;
1768 const uschar *ftest_localpart = NULL;
1769 const uschar *ftest_prefix = NULL;
1770 const uschar *ftest_suffix = NULL;
1771 uschar *log_oneline = NULL;
1772 uschar *malware_test_file = NULL;
1773 uschar *real_sender_address;
1774 uschar *originator_home = US"/";
1778 struct stat statbuf;
1779 pid_t passed_qr_pid = (pid_t)0;
1780 int passed_qr_pipe = -1;
1781 gid_t group_list[EXIM_GROUPLIST_SIZE];
1783 /* For the -bI: flag */
1784 enum commandline_info info_flag = CMDINFO_NONE;
1785 BOOL info_stdout = FALSE;
1787 /* Possible options for -R and -S */
1789 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1791 /* Need to define this in case we need to change the environment in order
1792 to get rid of a bogus time zone. We have to make it char rather than uschar
1793 because some OS define it in /usr/include/unistd.h. */
1795 extern char **environ;
1797 #ifdef MEASURE_TIMING
1798 (void)gettimeofday(×tamp_startup, NULL);
1801 store_init(); /* Initialise the memory allocation susbsystem */
1802 pcre_init(); /* Set up memory handling for pcre */
1804 /* If the Exim user and/or group and/or the configuration file owner/group were
1805 defined by ref:name at build time, we must now find the actual uid/gid values.
1806 This is a feature to make the lives of binary distributors easier. */
1808 #ifdef EXIM_USERNAME
1809 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1812 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1814 /* If ref:name uses a number as the name, route_finduser() returns
1815 TRUE with exim_uid set and pw coerced to NULL. */
1817 exim_gid = pw->pw_gid;
1818 #ifndef EXIM_GROUPNAME
1821 "exim: ref:name should specify a usercode, not a group.\n"
1822 "exim: can't let you get away with it unless you also specify a group.\n");
1826 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1829 #ifdef EXIM_GROUPNAME
1830 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1831 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1834 #ifdef CONFIGURE_OWNERNAME
1835 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1836 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1837 CONFIGURE_OWNERNAME);
1840 /* We default the system_filter_user to be the Exim run-time user, as a
1841 sane non-root value. */
1842 system_filter_uid = exim_uid;
1844 #ifdef CONFIGURE_GROUPNAME
1845 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1846 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1847 CONFIGURE_GROUPNAME);
1850 /* In the Cygwin environment, some initialization used to need doing.
1851 It was fudged in by means of this macro; now no longer but we'll leave
1852 it in case of others. */
1858 /* Check a field which is patched when we are running Exim within its
1859 testing harness; do a fast initial check, and then the whole thing. */
1861 f.running_in_test_harness =
1862 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1863 if (f.running_in_test_harness)
1866 /* Protect against abusive argv[0] */
1867 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1868 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1870 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1871 at the start of a program; however, it seems that some environments do not
1872 follow this. A "strange" locale can affect the formatting of timestamps, so we
1875 setlocale(LC_ALL, "C");
1877 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1879 #ifdef _POSIX_MONOTONIC_CLOCK
1883 /* Set up the default handler for timing using alarm(). */
1885 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1887 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1888 because store_malloc writes a log entry on failure. */
1890 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1891 exim_fail("exim: failed to get store for log buffer\n");
1893 /* Initialize the default log options. */
1895 bits_set(log_selector, log_selector_size, log_default);
1897 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1898 NULL when the daemon is run and the file is closed. We have to use this
1899 indirection, because some systems don't allow writing to the variable "stderr".
1902 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1904 /* Ensure there is a big buffer for temporary use in several places. It is put
1905 in malloc store so that it can be freed for enlargement if necessary. */
1907 big_buffer = store_malloc(big_buffer_size);
1909 /* Set up the handler for the data request signal, and set the initial
1910 descriptive text. */
1912 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1913 set_process_info("initializing");
1914 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1917 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1918 sigaction(SIGSEGV, &act, NULL);
1921 signal(SIGSEGV, segv_handler); /* log faults */
1924 /* If running in a dockerized environment, the TERM signal is only
1925 delegated to the PID 1 if we request it by setting an signal handler */
1926 if (getpid() == 1) signal(SIGTERM, term_handler);
1928 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1929 in the daemon code. For the rest of Exim's uses, we ignore it. */
1931 signal(SIGHUP, SIG_IGN);
1933 /* We don't want to die on pipe errors as the code is written to handle
1934 the write error instead. */
1936 signal(SIGPIPE, SIG_IGN);
1938 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1939 set to SIG_IGN. This causes subprocesses that complete before the parent
1940 process waits for them not to hang around, so when Exim calls wait(), nothing
1941 is there. The wait() code has been made robust against this, but let's ensure
1942 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1943 ending status. We use sigaction rather than plain signal() on those OS where
1944 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1945 problem on AIX with this.) */
1949 struct sigaction act;
1950 act.sa_handler = SIG_DFL;
1951 sigemptyset(&(act.sa_mask));
1953 sigaction(SIGCHLD, &act, NULL);
1956 signal(SIGCHLD, SIG_DFL);
1959 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1964 /* Set up the version number. Set up the leading 'E' for the external form of
1965 message ids, set the pointer to the internal form, and initialize it to
1966 indicate no message being processed. */
1969 message_id_option[0] = '-';
1970 message_id_external = message_id_option + 1;
1971 message_id_external[0] = 'E';
1972 message_id = message_id_external + 1;
1975 /* Set the umask to zero so that any files Exim creates using open() are
1976 created with the modes that it specifies. NOTE: Files created with fopen() have
1977 a problem, which was not recognized till rather late (February 2006). With this
1978 umask, such files will be world writeable. (They are all content scanning files
1979 in the spool directory, which isn't world-accessible, so this is not a
1980 disaster, but it's untidy.) I don't want to change this overall setting,
1981 however, because it will interact badly with the open() calls. Instead, there's
1982 now a function called modefopen() that fiddles with the umask while calling
1987 /* Precompile the regular expression for matching a message id. Keep this in
1988 step with the code that generates ids in the accept.c module. We need to do
1989 this here, because the -M options check their arguments for syntactic validity
1990 using mac_ismsgid, which uses this. */
1993 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
1995 /* Precompile the regular expression that is used for matching an SMTP error
1996 code, possibly extended, at the start of an error message. Note that the
1997 terminating whitespace character is included. */
2000 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2003 #ifdef WHITELIST_D_MACROS
2004 /* Precompile the regular expression used to filter the content of macros
2005 given to -D for permissibility. */
2007 regex_whitelisted_macro =
2008 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2011 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2012 this seems to be a generally accepted convention, since one finds symbolic
2013 links called "mailq" in standard OS configurations. */
2015 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2016 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2019 receiving_message = FALSE;
2020 called_as = US"-mailq";
2023 /* If the program is called as "rmail" treat it as equivalent to
2024 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2025 i.e. preventing a single dot on a line from terminating the message, and
2026 returning with zero return code, even in cases of error (provided an error
2027 message has been sent). */
2029 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2030 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2033 called_as = US"-rmail";
2034 errors_sender_rc = EXIT_SUCCESS;
2037 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2038 this is a smail convention. */
2040 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2041 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2043 smtp_input = smtp_batched_input = TRUE;
2044 called_as = US"-rsmtp";
2047 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2048 this is a smail convention. */
2050 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2051 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2054 receiving_message = FALSE;
2055 called_as = US"-runq";
2058 /* If the program is called as "newaliases" treat it as equivalent to
2059 "exim -bi"; this is a sendmail convention. */
2061 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2062 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2065 receiving_message = FALSE;
2066 called_as = US"-newaliases";
2069 /* Save the original effective uid for a couple of uses later. It should
2070 normally be root, but in some esoteric environments it may not be. */
2072 original_euid = geteuid();
2073 original_egid = getegid();
2075 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2076 to be the same as the real ones. This makes a difference only if Exim is setuid
2077 (or setgid) to something other than root, which could be the case in some
2078 special configurations. */
2080 real_uid = getuid();
2081 real_gid = getgid();
2083 if (real_uid == root_uid)
2085 if ((rv = setgid(real_gid)))
2086 exim_fail("exim: setgid(%ld) failed: %s\n",
2087 (long int)real_gid, strerror(errno));
2088 if ((rv = setuid(real_uid)))
2089 exim_fail("exim: setuid(%ld) failed: %s\n",
2090 (long int)real_uid, strerror(errno));
2093 /* If neither the original real uid nor the original euid was root, Exim is
2094 running in an unprivileged state. */
2096 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2098 /* For most of the args-parsing we need to use permanent pool memory */
2100 int old_pool = store_pool;
2101 store_pool = POOL_PERM;
2103 /* Scan the program's arguments. Some can be dealt with right away; others are
2104 simply recorded for checking and handling afterwards. Do a high-level switch
2105 on the second character (the one after '-'), to save some effort. */
2107 for (i = 1; i < argc; i++)
2109 BOOL badarg = FALSE;
2110 uschar * arg = argv[i];
2114 /* An argument not starting with '-' is the start of a recipients list;
2115 break out of the options-scanning loop. */
2123 /* An option consisting of -- terminates the options */
2125 if (Ustrcmp(arg, "--") == 0)
2127 recipients_arg = i + 1;
2131 /* Handle flagged options */
2133 switchchar = arg[1];
2136 /* Make all -ex options synonymous with -oex arguments, since that
2137 is assumed by various callers. Also make -qR options synonymous with -R
2138 options, as that seems to be required as well. Allow for -qqR too, and
2139 the same for -S options. */
2141 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2142 Ustrncmp(arg+1, "qR", 2) == 0 ||
2143 Ustrncmp(arg+1, "qS", 2) == 0)
2145 switchchar = arg[2];
2148 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2150 switchchar = arg[3];
2152 f.queue_2stage = TRUE;
2155 /* Make -r synonymous with -f, since it is a documented alias */
2157 else if (arg[1] == 'r') switchchar = 'f';
2159 /* Make -ov synonymous with -v */
2161 else if (Ustrcmp(arg, "-ov") == 0)
2167 /* deal with --option_aliases */
2168 else if (switchchar == '-')
2170 if (Ustrcmp(argrest, "help") == 0)
2172 usage_wanted = TRUE;
2175 else if (Ustrcmp(argrest, "version") == 0)
2182 /* High-level switch on active initial letter */
2187 /* sendmail uses -Ac and -Am to control which .cf file is used;
2190 if (!*argrest) { badarg = TRUE; break; }
2193 BOOL ignore = FALSE;
2198 if (*(argrest + 1) == '\0')
2202 if (!ignore) badarg = TRUE;
2206 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2207 so has no need of it. */
2210 if (!*argrest) i++; /* Skip over the type */
2216 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2220 /* -bd: Run in daemon mode, awaiting SMTP connections.
2221 -bdf: Ditto, but in the foreground.
2224 f.daemon_listen = f.daemon_scion = TRUE;
2225 if (*argrest == 'f') f.background_daemon = FALSE;
2226 else if (*argrest) badarg = TRUE;
2229 /* -be: Run in expansion test mode
2230 -bem: Ditto, but read a message from a file first
2233 expansion_test = checking = TRUE;
2234 if (*argrest == 'm')
2236 if (++i >= argc) { badarg = TRUE; break; }
2237 expansion_test_message = argv[i];
2240 if (*argrest) badarg = TRUE;
2243 /* -bF: Run system filter test */
2245 filter_test |= checking = FTEST_SYSTEM;
2246 if (*argrest) badarg = TRUE;
2247 else if (++i < argc) filter_test_sfile = argv[i];
2248 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2251 /* -bf: Run user filter test
2252 -bfd: Set domain for filter testing
2253 -bfl: Set local part for filter testing
2254 -bfp: Set prefix for filter testing
2255 -bfs: Set suffix for filter testing
2260 filter_test |= checking = FTEST_USER;
2261 if (++i < argc) filter_test_ufile = argv[i];
2262 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2267 exim_fail("exim: string expected after %s\n", arg);
2268 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2269 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2270 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2271 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2276 /* -bh: Host checking - an IP address must follow. */
2278 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2280 if (++i >= argc) { badarg = TRUE; break; }
2281 sender_host_address = string_copy_taint(
2282 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2284 host_checking = checking = f.log_testing_mode = TRUE;
2285 f.host_checking_callout = *argrest == 'c';
2286 message_logs = FALSE;
2291 /* -bi: This option is used by sendmail to initialize *the* alias file,
2292 though it has the -oA option to specify a different file. Exim has no
2293 concept of *the* alias file, but since Sun's YP make script calls
2294 sendmail this way, some support must be provided. */
2296 if (!*argrest) bi_option = TRUE;
2300 /* -bI: provide information, of the type to follow after a colon.
2301 This is an Exim flag. */
2303 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2305 uschar *p = argrest+1;
2306 info_flag = CMDINFO_HELP;
2308 if (strcmpic(p, CUS"sieve") == 0)
2310 info_flag = CMDINFO_SIEVE;
2313 else if (strcmpic(p, CUS"dscp") == 0)
2315 info_flag = CMDINFO_DSCP;
2318 else if (strcmpic(p, CUS"help") == 0)
2324 /* -bm: Accept and deliver message - the default option. Reinstate
2325 receiving_message, which got turned off for all -b options.
2326 -bmalware: test the filename given for malware */
2328 if (!*argrest) receiving_message = TRUE;
2329 else if (Ustrcmp(argrest, "alware") == 0)
2331 if (++i >= argc) { badarg = TRUE; break; }
2333 malware_test_file = argv[i];
2338 /* -bnq: For locally originating messages, do not qualify unqualified
2339 addresses. In the envelope, this causes errors; in header lines they
2342 if (Ustrcmp(argrest, "q") == 0)
2344 f.allow_unqualified_sender = FALSE;
2345 f.allow_unqualified_recipient = FALSE;
2350 /* -bpxx: List the contents of the mail queue, in various forms. If
2351 the option is -bpc, just a queue count is needed. Otherwise, if the
2352 first letter after p is r, then order is random. */
2354 if (*argrest == 'c')
2357 if (*++argrest) badarg = TRUE;
2361 if (*argrest == 'r')
2363 list_queue_option = 8;
2366 else list_queue_option = 0;
2370 /* -bp: List the contents of the mail queue, top-level only */
2374 /* -bpu: List the contents of the mail queue, top-level undelivered */
2376 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2378 /* -bpa: List the contents of the mail queue, including all delivered */
2380 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2382 /* Unknown after -bp[r] */
2388 /* -bP: List the configuration variables given as the address list.
2389 Force -v, so configuration errors get displayed. */
2392 /* -bP config: we need to setup here, because later,
2393 when list_options is checked, the config is read already */
2396 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2399 readconf_save_config(version_string);
2403 list_options = TRUE;
2404 debug_selector |= D_v;
2405 debug_file = stderr;
2409 /* -brt: Test retry configuration lookup */
2411 if (Ustrcmp(argrest, "t") == 0)
2414 test_retry_arg = i + 1;
2418 /* -brw: Test rewrite configuration */
2420 else if (Ustrcmp(argrest, "w") == 0)
2423 test_rewrite_arg = i + 1;
2429 /* -bS: Read SMTP commands on standard input, but produce no replies -
2430 all errors are reported by sending messages. */
2433 smtp_input = smtp_batched_input = receiving_message = TRUE;
2437 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2438 on standard output. */
2440 if (!*argrest) smtp_input = receiving_message = TRUE;
2444 /* -bt: address testing mode */
2447 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2451 /* -bv: verify addresses */
2454 verify_address_mode = checking = f.log_testing_mode = TRUE;
2456 /* -bvs: verify sender addresses */
2458 else if (Ustrcmp(argrest, "s") == 0)
2460 verify_address_mode = checking = f.log_testing_mode = TRUE;
2461 verify_as_sender = TRUE;
2466 /* -bV: Print version string and support details */
2470 printf("Exim version %s #%s built %s\n", version_string,
2471 version_cnumber, version_date);
2472 printf("%s\n", CS version_copyright);
2473 version_printed = TRUE;
2474 show_whats_supported(TRUE);
2475 f.log_testing_mode = TRUE;
2480 /* -bw: inetd wait mode, accept a listening socket as stdin */
2482 f.inetd_wait_mode = TRUE;
2483 f.background_daemon = FALSE;
2484 f.daemon_listen = f.daemon_scion = TRUE;
2486 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2487 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2498 /* -C: change configuration file list; ignore if it isn't really
2499 a change! Enforce a prefix check if required. */
2503 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2504 if (Ustrcmp(config_main_filelist, argrest) != 0)
2506 #ifdef ALT_CONFIG_PREFIX
2508 int len = Ustrlen(ALT_CONFIG_PREFIX);
2509 const uschar *list = argrest;
2511 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2512 while((filename = string_nextinlist(&list, &sep, big_buffer,
2514 if ( ( Ustrlen(filename) < len
2515 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2516 || Ustrstr(filename, "/../") != NULL
2518 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2520 exim_fail("-C Permission denied\n");
2522 if (real_uid != root_uid)
2524 #ifdef TRUSTED_CONFIG_LIST
2526 if (real_uid != exim_uid
2527 #ifdef CONFIGURE_OWNER
2528 && real_uid != config_uid
2531 f.trusted_config = FALSE;
2534 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2537 struct stat statbuf;
2539 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2540 (statbuf.st_uid != root_uid /* owner not root */
2541 #ifdef CONFIGURE_OWNER
2542 && statbuf.st_uid != config_uid /* owner not the special one */
2545 (statbuf.st_gid != root_gid /* group not root */
2546 #ifdef CONFIGURE_GROUP
2547 && statbuf.st_gid != config_gid /* group not the special one */
2549 && (statbuf.st_mode & 020) != 0 /* group writeable */
2551 (statbuf.st_mode & 2) != 0) /* world writeable */
2553 f.trusted_config = FALSE;
2558 /* Well, the trust list at least is up to scratch... */
2560 uschar *trusted_configs[32];
2563 int old_pool = store_pool;
2564 store_pool = POOL_MAIN;
2566 reset_point = store_mark();
2567 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2569 uschar *start = big_buffer, *nl;
2570 while (*start && isspace(*start))
2574 nl = Ustrchr(start, '\n');
2577 trusted_configs[nr_configs++] = string_copy(start);
2578 if (nr_configs == nelem(trusted_configs))
2586 const uschar *list = argrest;
2588 while (f.trusted_config && (filename = string_nextinlist(&list,
2589 &sep, big_buffer, big_buffer_size)))
2591 for (i=0; i < nr_configs; i++)
2592 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2594 if (i == nr_configs)
2596 f.trusted_config = FALSE;
2601 else /* No valid prefixes found in trust_list file. */
2602 f.trusted_config = FALSE;
2603 store_reset(reset_point);
2604 store_pool = old_pool;
2607 else /* Could not open trust_list file. */
2608 f.trusted_config = FALSE;
2611 /* Not root; don't trust config */
2612 f.trusted_config = FALSE;
2616 config_main_filelist = argrest;
2617 f.config_changed = TRUE;
2622 /* -D: set up a macro definition */
2625 #ifdef DISABLE_D_OPTION
2626 exim_fail("exim: -D is not available in this Exim binary\n");
2632 uschar *s = argrest;
2635 while (isspace(*s)) s++;
2637 if (*s < 'A' || *s > 'Z')
2638 exim_fail("exim: macro name set by -D must start with "
2639 "an upper case letter\n");
2641 while (isalnum(*s) || *s == '_')
2643 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2647 if (ptr == 0) { badarg = TRUE; break; }
2648 while (isspace(*s)) s++;
2651 if (*s++ != '=') { badarg = TRUE; break; }
2652 while (isspace(*s)) s++;
2655 for (m = macros_user; m; m = m->next)
2656 if (Ustrcmp(m->name, name) == 0)
2657 exim_fail("exim: duplicated -D in command line\n");
2659 m = macro_create(name, s, TRUE);
2661 if (clmacro_count >= MAX_CLMACROS)
2662 exim_fail("exim: too many -D options on command line\n");
2663 clmacros[clmacro_count++] =
2664 string_sprintf("-D%s=%s", m->name, m->replacement);
2671 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2673 if (Ustrcmp(argrest, "ropcr") == 0)
2675 /* drop_cr = TRUE; */
2678 /* -dp: Set up a debug pretrigger buffer with given size. */
2680 else if (Ustrcmp(argrest, "p") == 0)
2684 debug_pretrigger_setup(argv[i]);
2686 /* -dt: Set a debug trigger selector */
2688 else if (Ustrncmp(argrest, "t=", 2) == 0)
2689 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2691 /* -d: Set debug level (see also -v below).
2692 If -dd is used, debugging subprocesses of the daemon is disabled. */
2696 /* Use an intermediate variable so that we don't set debugging while
2697 decoding the debugging bits. */
2699 unsigned int selector = D_default;
2702 if (*argrest == 'd')
2704 f.debug_daemon = TRUE;
2708 decode_bits(&selector, 1, debug_notall, argrest,
2709 debug_options, debug_options_count, US"debug", 0);
2710 debug_selector = selector;
2715 /* -E: This is a local error message. This option is not intended for
2716 external use at all, but is not restricted to trusted callers because it
2717 does no harm (just suppresses certain error messages) and if Exim is run
2718 not setuid root it won't always be trusted when it generates error
2719 messages using this option. If there is a message id following -E, point
2720 message_reference at it, for logging. */
2723 f.local_error_message = TRUE;
2724 if (mac_ismsgid(argrest)) message_reference = argrest;
2728 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2729 option, so it looks as if historically the -oex options are also callable
2730 without the leading -o. So we have to accept them. Before the switch,
2731 anything starting -oe has been converted to -e. Exim does not support all
2732 of the sendmail error options. */
2735 if (Ustrcmp(argrest, "e") == 0)
2737 arg_error_handling = ERRORS_SENDER;
2738 errors_sender_rc = EXIT_SUCCESS;
2740 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2741 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2742 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2743 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2748 /* -F: Set sender's full name, used instead of the gecos entry from
2749 the password file. Since users can usually alter their gecos entries,
2750 there's no security involved in using this instead. The data can follow
2751 the -F or be in the next argument. */
2755 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2756 originator_name = string_copy_taint(
2757 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2759 f.sender_name_forced = TRUE;
2763 /* -f: Set sender's address - this value is only actually used if Exim is
2764 run by a trusted user, or if untrusted_set_sender is set and matches the
2765 address, except that the null address can always be set by any user. The
2766 test for this happens later, when the value given here is ignored when not
2767 permitted. For an untrusted user, the actual sender is still put in Sender:
2768 if it doesn't match the From: header (unless no_local_from_check is set).
2769 The data can follow the -f or be in the next argument. The -r switch is an
2770 obsolete form of -f but since there appear to be programs out there that
2771 use anything that sendmail has ever supported, better accept it - the
2772 synonymizing is done before the switch above.
2774 At this stage, we must allow domain literal addresses, because we don't
2775 know what the setting of allow_domain_literals is yet. Ditto for trailing
2776 dots and strip_trailing_dot. */
2780 int dummy_start, dummy_end;
2783 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2784 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2786 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2789 uschar * temp = argrest + Ustrlen(argrest) - 1;
2790 while (temp >= argrest && isspace(*temp)) temp--;
2791 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2792 allow_domain_literals = TRUE;
2793 strip_trailing_dot = TRUE;
2795 allow_utf8_domains = TRUE;
2797 if (!(sender_address = parse_extract_address(argrest, &errmess,
2798 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2799 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2801 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2803 message_smtputf8 = string_is_utf8(sender_address);
2804 allow_utf8_domains = FALSE;
2806 allow_domain_literals = FALSE;
2807 strip_trailing_dot = FALSE;
2809 f.sender_address_forced = TRUE;
2813 /* -G: sendmail invocation to specify that it's a gateway submission and
2814 sendmail may complain about problems instead of fixing them.
2815 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2816 not at this time complain about problems. */
2822 /* -h: Set the hop count for an incoming message. Exim does not currently
2823 support this; it always computes it by counting the Received: headers.
2824 To put it in will require a change to the spool header file format. */
2828 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2829 if (!isdigit(*argrest)) badarg = TRUE;
2833 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2834 not to be documented for sendmail but mailx (at least) uses it) */
2837 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2841 /* -L: set the identifier used for syslog; equivalent to setting
2842 syslog_processname in the config file, but needs to be an admin option. */
2846 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2847 if ((sz = Ustrlen(argrest)) > 32)
2848 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2850 exim_fail("exim: the -L syslog name is too short\n");
2851 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2855 receiving_message = FALSE;
2857 /* -MC: continue delivery of another message via an existing open
2858 file descriptor. This option is used for an internal call by the
2859 smtp transport when there is a pending message waiting to go to an
2860 address to which it has got a connection. Five subsequent arguments are
2861 required: transport name, host name, IP address, sequence number, and
2862 message_id. Transports may decline to create new processes if the sequence
2863 number gets too big. The channel is stdin. This (-MC) must be the last
2864 argument. There's a subsequent check that the real-uid is privileged.
2866 If we are running in the test harness. delay for a bit, to let the process
2867 that set this one up complete. This makes for repeatability of the logging,
2870 if (Ustrcmp(argrest, "C") == 0)
2872 union sockaddr_46 interface_sock;
2873 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2876 exim_fail("exim: too many or too few arguments after -MC\n");
2878 if (msg_action_arg >= 0)
2879 exim_fail("exim: incompatible arguments\n");
2881 continue_transport = string_copy_taint(
2882 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2884 continue_hostname = string_copy_taint(
2885 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2887 continue_host_address = string_copy_taint(
2888 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2890 continue_sequence = Uatoi(argv[++i]);
2891 msg_action = MSG_DELIVER;
2892 msg_action_arg = ++i;
2893 forced_delivery = TRUE;
2894 queue_run_pid = passed_qr_pid;
2895 queue_run_pipe = passed_qr_pipe;
2897 if (!mac_ismsgid(argv[i]))
2898 exim_fail("exim: malformed message id %s after -MC option\n",
2901 /* Set up $sending_ip_address and $sending_port, unless proxied */
2903 if (!continue_proxy_cipher)
2904 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2906 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2909 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2912 testharness_pause_ms(500);
2916 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2920 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2921 precedes -MC (see above). The flag indicates that the host to which
2922 Exim is connected has accepted an AUTH sequence. */
2924 case 'A': f.smtp_authenticated = TRUE; break;
2926 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2927 that exim is connected to supports the esmtp extension DSN */
2929 case 'D': smtp_peer_options |= OPTION_DSN; break;
2931 /* -MCd: for debug, set a process-purpose string */
2933 case 'd': if (++i < argc)
2934 process_purpose = string_copy_taint(
2935 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2940 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2941 from the commandline should be tainted - but we will need an untainted
2942 value for the spoolfile when doing a -odi delivery process. */
2944 case 'G': if (++i < argc) queue_name = string_copy_taint(
2945 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2950 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2952 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2954 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2955 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2956 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2958 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2960 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2965 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2966 it preceded -MC (see above) */
2968 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2970 #ifdef SUPPORT_SOCKS
2971 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2972 case 'p': proxy_session = TRUE;
2975 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
2978 proxy_local_port = Uatoi(argv[i]);
2981 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
2984 proxy_external_port = Uatoi(argv[i]);
2990 /* -MCQ: pass on the pid of the queue-running process that started
2991 this chain of deliveries and the fd of its synchronizing pipe; this
2992 is useful only when it precedes -MC (see above) */
2994 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2996 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3000 /* -MCq: do a quota check on the given recipient for the given size
3001 of message. Separate from -MC. */
3002 case 'q': rcpt_verify_quota = TRUE;
3003 if (++i < argc) message_size = Uatoi(argv[i]);
3007 /* -MCS: set the smtp_use_size flag; this is useful only when it
3008 precedes -MC (see above) */
3010 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3013 /* -MCs: used with -MCt; SNI was sent */
3014 /* -MCr: ditto, DANE */
3017 case 's': if (++i < argc)
3019 continue_proxy_sni = string_copy_taint(
3020 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3022 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3027 /* -MCt: similar to -MCT below but the connection is still open
3028 via a proxy process which handles the TLS context and coding.
3029 Require three arguments for the proxied local address and port,
3030 and the TLS cipher. */
3032 case 't': if (++i < argc)
3033 sending_ip_address = string_copy_taint(
3034 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3038 sending_port = (int)(Uatol(argv[i]));
3041 continue_proxy_cipher = string_copy_taint(
3042 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3047 /* -MCT: set the tls_offered flag; this is useful only when it
3048 precedes -MC (see above). The flag indicates that the host to which
3049 Exim is connected has offered TLS support. */
3051 case 'T': smtp_peer_options |= OPTION_TLS; break;
3054 default: badarg = TRUE; break;
3059 /* -M[x]: various operations on the following list of message ids:
3060 -M deliver the messages, ignoring next retry times and thawing
3061 -Mc deliver the messages, checking next retry times, no thawing
3062 -Mf freeze the messages
3063 -Mg give up on the messages
3064 -Mt thaw the messages
3065 -Mrm remove the messages
3066 In the above cases, this must be the last option. There are also the
3067 following options which are followed by a single message id, and which
3068 act on that message. Some of them use the "recipient" addresses as well.
3069 -Mar add recipient(s)
3070 -MG move to a different queue
3071 -Mmad mark all recipients delivered
3072 -Mmd mark recipients(s) delivered
3074 -Mset load a message for use with -be
3076 -Mvc show copy (of whole message, in RFC 2822 format)
3083 msg_action = MSG_DELIVER;
3084 forced_delivery = f.deliver_force_thaw = TRUE;
3086 else if (Ustrcmp(argrest, "ar") == 0)
3088 msg_action = MSG_ADD_RECIPIENT;
3089 one_msg_action = TRUE;
3091 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3092 else if (Ustrcmp(argrest, "es") == 0)
3094 msg_action = MSG_EDIT_SENDER;
3095 one_msg_action = TRUE;
3097 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3098 else if (Ustrcmp(argrest, "g") == 0)
3100 msg_action = MSG_DELIVER;
3101 deliver_give_up = TRUE;
3103 else if (Ustrcmp(argrest, "G") == 0)
3105 msg_action = MSG_SETQUEUE;
3106 queue_name_dest = string_copy_taint(
3107 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3110 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3111 else if (Ustrcmp(argrest, "md") == 0)
3113 msg_action = MSG_MARK_DELIVERED;
3114 one_msg_action = TRUE;
3116 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3117 else if (Ustrcmp(argrest, "set") == 0)
3119 msg_action = MSG_LOAD;
3120 one_msg_action = TRUE;
3122 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3123 else if (Ustrcmp(argrest, "vb") == 0)
3125 msg_action = MSG_SHOW_BODY;
3126 one_msg_action = TRUE;
3128 else if (Ustrcmp(argrest, "vc") == 0)
3130 msg_action = MSG_SHOW_COPY;
3131 one_msg_action = TRUE;
3133 else if (Ustrcmp(argrest, "vh") == 0)
3135 msg_action = MSG_SHOW_HEADER;
3136 one_msg_action = TRUE;
3138 else if (Ustrcmp(argrest, "vl") == 0)
3140 msg_action = MSG_SHOW_LOG;
3141 one_msg_action = TRUE;
3143 else { badarg = TRUE; break; }
3145 /* All the -Mxx options require at least one message id. */
3147 msg_action_arg = i + 1;
3148 if (msg_action_arg >= argc)
3149 exim_fail("exim: no message ids given after %s option\n", arg);
3151 /* Some require only message ids to follow */
3153 if (!one_msg_action)
3155 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3156 exim_fail("exim: malformed message id %s after %s option\n",
3158 goto END_ARG; /* Remaining args are ids */
3161 /* Others require only one message id, possibly followed by addresses,
3162 which will be handled as normal arguments. */
3166 if (!mac_ismsgid(argv[msg_action_arg]))
3167 exim_fail("exim: malformed message id %s after %s option\n",
3168 argv[msg_action_arg], arg);
3174 /* Some programs seem to call the -om option without the leading o;
3175 for sendmail it askes for "me too". Exim always does this. */
3178 if (*argrest) badarg = TRUE;
3182 /* -N: don't do delivery - a debugging option that stops transports doing
3183 their thing. It implies debugging at the D_v level. */
3188 f.dont_deliver = TRUE;
3189 debug_selector |= D_v;
3190 debug_file = stderr;
3196 /* -n: This means "don't alias" in sendmail, apparently.
3197 For normal invocations, it has no effect.
3198 It may affect some other options. */
3204 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3205 option to the specified value. This form uses long names. We need to handle
3206 -O option=value and -Ooption=value. */
3211 exim_fail("exim: string expected after -O\n");
3217 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3220 if (!*(alias_arg = argrest))
3221 if (i+1 < argc) alias_arg = argv[++i];
3222 else exim_fail("exim: string expected after -oA\n");
3225 /* -oB: Set a connection message max value for remote deliveries */
3228 uschar * p = argrest;
3230 if (i+1 < argc && isdigit((argv[i+1][0])))
3234 connection_max_messages = 1;
3241 exim_fail("exim: number expected after -oB\n");
3242 connection_max_messages = Uatoi(p);
3247 /* -odb: background delivery */
3250 if (Ustrcmp(argrest, "b") == 0)
3252 f.synchronous_delivery = FALSE;
3253 arg_queue_only = FALSE;
3254 queue_only_set = TRUE;
3257 /* -odd: testsuite-only: add no inter-process delays */
3259 else if (Ustrcmp(argrest, "d") == 0)
3260 f.testsuite_delays = FALSE;
3262 /* -odf: foreground delivery (smail-compatible option); same effect as
3263 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3266 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3268 f.synchronous_delivery = TRUE;
3269 arg_queue_only = FALSE;
3270 queue_only_set = TRUE;
3273 /* -odq: queue only */
3275 else if (Ustrcmp(argrest, "q") == 0)
3277 f.synchronous_delivery = FALSE;
3278 arg_queue_only = TRUE;
3279 queue_only_set = TRUE;
3282 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3283 but no remote delivery */
3285 else if (Ustrcmp(argrest, "qs") == 0)
3287 f.queue_smtp = TRUE;
3288 arg_queue_only = FALSE;
3289 queue_only_set = TRUE;
3294 /* -oex: Sendmail error flags. As these are also accepted without the
3295 leading -o prefix, for compatibility with vacation and other callers,
3296 they are handled with -e above. */
3298 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3299 -oitrue: Another sendmail syntax for the same */
3302 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3307 /* -oM*: Set various characteristics for an incoming message; actually
3308 acted on for trusted callers only. */
3313 exim_fail("exim: data expected after -oM%s\n", argrest);
3315 /* -oMa: Set sender host address */
3317 if (Ustrcmp(argrest, "a") == 0)
3318 sender_host_address = string_copy_taint(
3319 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3322 /* -oMaa: Set authenticator name */
3324 else if (Ustrcmp(argrest, "aa") == 0)
3325 sender_host_authenticated = string_copy_taint(
3326 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3329 /* -oMas: setting authenticated sender */
3331 else if (Ustrcmp(argrest, "as") == 0)
3332 authenticated_sender = string_copy_taint(
3333 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3336 /* -oMai: setting authenticated id */
3338 else if (Ustrcmp(argrest, "ai") == 0)
3339 authenticated_id = string_copy_taint(
3340 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMai"),
3343 /* -oMi: Set incoming interface address */
3345 else if (Ustrcmp(argrest, "i") == 0)
3346 interface_address = string_copy_taint(
3347 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3350 /* -oMm: Message reference */
3352 else if (Ustrcmp(argrest, "m") == 0)
3354 if (!mac_ismsgid(argv[i+1]))
3355 exim_fail("-oMm must be a valid message ID\n");
3356 if (!f.trusted_config)
3357 exim_fail("-oMm must be called by a trusted user/config\n");
3358 message_reference = argv[++i];
3361 /* -oMr: Received protocol */
3363 else if (Ustrcmp(argrest, "r") == 0)
3365 if (received_protocol)
3366 exim_fail("received_protocol is set already\n");
3368 received_protocol = string_copy_taint(
3369 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3372 /* -oMs: Set sender host name */
3374 else if (Ustrcmp(argrest, "s") == 0)
3375 sender_host_name = string_copy_taint(
3376 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3379 /* -oMt: Set sender ident */
3381 else if (Ustrcmp(argrest, "t") == 0)
3383 sender_ident_set = TRUE;
3384 sender_ident = string_copy_taint(
3385 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3389 /* Else a bad argument */
3396 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3397 seem to call this as -m (undocumented), so that is also accepted (see
3399 /* -oo: An ancient flag for old-style addresses which still seems to
3400 crop up in some calls (see in SCO). */
3404 if (*argrest) badarg = TRUE;
3407 /* -oP <name>: set pid file path for daemon
3408 -oPX: delete pid file of daemon */
3411 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3412 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3413 "(uid=%d euid=%d | %d)\n",
3414 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3415 if (!*argrest) override_pid_file_path = argv[++i];
3416 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3421 /* -or <n>: set timeout for non-SMTP acceptance
3422 -os <n>: set timeout for SMTP acceptance */
3427 int * tp = argrest[-1] == 'r'
3428 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3430 *tp = readconf_readtime(argrest, 0, FALSE);
3431 else if (i+1 < argc)
3432 *tp = readconf_readtime(argv[++i], 0, FALSE);
3435 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3439 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3440 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3443 if (*argrest) badarg = TRUE;
3444 else override_local_interfaces = string_copy_taint(
3445 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3449 /* -oY: Override creation of daemon notifier socket */
3452 if (*argrest) badarg = TRUE;
3453 else notifier_socket = NULL;
3456 /* Unknown -o argument */
3464 /* -ps: force Perl startup; -pd force delayed Perl startup */
3468 if (*argrest == 's' && argrest[1] == 0)
3470 perl_start_option = 1;
3473 if (*argrest == 'd' && argrest[1] == 0)
3475 perl_start_option = -1;
3480 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3481 which sets the host protocol and host name */
3484 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3488 uschar * hn = Ustrchr(argrest, ':');
3490 if (received_protocol)
3491 exim_fail("received_protocol is set already\n");
3494 received_protocol = string_copy_taint(
3495 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3499 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3500 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3501 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3508 receiving_message = FALSE;
3509 if (queue_interval >= 0)
3510 exim_fail("exim: -q specified more than once\n");
3512 /* -qq...: Do queue runs in a 2-stage manner */
3514 if (*argrest == 'q')
3516 f.queue_2stage = TRUE;
3520 /* -qi...: Do only first (initial) deliveries */
3522 if (*argrest == 'i')
3524 f.queue_run_first_delivery = TRUE;
3528 /* -qf...: Run the queue, forcing deliveries
3529 -qff..: Ditto, forcing thawing as well */
3531 if (*argrest == 'f')
3533 f.queue_run_force = TRUE;
3534 if (*++argrest == 'f')
3536 f.deliver_force_thaw = TRUE;
3541 /* -q[f][f]l...: Run the queue only on local deliveries */
3543 if (*argrest == 'l')
3545 f.queue_run_local = TRUE;
3549 /* -q[f][f][l][G<name>]... Work on the named queue */
3551 if (*argrest == 'G')
3554 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3555 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3556 queue_name = string_copyn(argrest, i);
3558 if (*argrest == '/') argrest++;
3561 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3562 only, optionally named, optionally starting from a given message id. */
3564 if (!(list_queue || count_queue))
3566 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3569 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3570 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3571 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3572 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3575 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3576 forced, optionally local only, optionally named. */
3578 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3580 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3584 case 'R': /* Synonymous with -qR... */
3586 const uschar *tainted_selectstr;
3588 receiving_message = FALSE;
3590 /* -Rf: As -R (below) but force all deliveries,
3591 -Rff: Ditto, but also thaw all frozen messages,
3592 -Rr: String is regex
3593 -Rrf: Regex and force
3594 -Rrff: Regex and force and thaw
3596 in all cases provided there are no further characters in this
3600 for (int i = 0; i < nelem(rsopts); i++)
3601 if (Ustrcmp(argrest, rsopts[i]) == 0)
3603 if (i != 2) f.queue_run_force = TRUE;
3604 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3605 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3606 argrest += Ustrlen(rsopts[i]);
3609 /* -R: Set string to match in addresses for forced queue run to
3610 pick out particular messages. */
3612 /* Avoid attacks from people providing very long strings, and do so before
3615 tainted_selectstr = argrest;
3616 else if (i+1 < argc)
3617 tainted_selectstr = argv[++i];
3619 exim_fail("exim: string expected after -R\n");
3620 deliver_selectstring = string_copy_taint(
3621 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3626 /* -r: an obsolete synonym for -f (see above) */
3629 /* -S: Like -R but works on sender. */
3631 case 'S': /* Synonymous with -qS... */
3633 const uschar *tainted_selectstr;
3635 receiving_message = FALSE;
3637 /* -Sf: As -S (below) but force all deliveries,
3638 -Sff: Ditto, but also thaw all frozen messages,
3639 -Sr: String is regex
3640 -Srf: Regex and force
3641 -Srff: Regex and force and thaw
3643 in all cases provided there are no further characters in this
3647 for (int i = 0; i < nelem(rsopts); i++)
3648 if (Ustrcmp(argrest, rsopts[i]) == 0)
3650 if (i != 2) f.queue_run_force = TRUE;
3651 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3652 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3653 argrest += Ustrlen(rsopts[i]);
3656 /* -S: Set string to match in addresses for forced queue run to
3657 pick out particular messages. */
3660 tainted_selectstr = argrest;
3661 else if (i+1 < argc)
3662 tainted_selectstr = argv[++i];
3664 exim_fail("exim: string expected after -S\n");
3665 deliver_selectstring_sender = string_copy_taint(
3666 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3671 /* -Tqt is an option that is exclusively for use by the testing suite.
3672 It is not recognized in other circumstances. It allows for the setting up
3673 of explicit "queue times" so that various warning/retry things can be
3674 tested. Otherwise variability of clock ticks etc. cause problems. */
3677 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3678 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3683 /* -t: Set flag to extract recipients from body of message. */
3686 if (!*argrest) extract_recipients = TRUE;
3688 /* -ti: Set flag to extract recipients from body of message, and also
3689 specify that dot does not end the message. */
3691 else if (Ustrcmp(argrest, "i") == 0)
3693 extract_recipients = TRUE;
3697 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3700 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3707 /* -U: This means "initial user submission" in sendmail, apparently. The
3708 doc claims that in future sendmail may refuse syntactically invalid
3709 messages instead of fixing them. For the moment, we just ignore it. */
3715 /* -v: verify things - this is a very low-level debugging */
3720 debug_selector |= D_v;
3721 debug_file = stderr;
3727 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3729 The -x flag tells the sendmail command that mail from a local
3730 mail program has National Language Support (NLS) extended characters
3731 in the body of the mail item. The sendmail command can send mail with
3732 extended NLS characters across networks that normally corrupts these
3735 As Exim is 8-bit clean, it just ignores this flag. */
3738 if (*argrest) badarg = TRUE;
3741 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3742 logs to that file. We swallow the parameter and otherwise ignore it. */
3747 exim_fail("exim: string expected after -X\n");
3750 /* -z: a line of text to log */
3755 log_oneline = string_copy_taint(
3756 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3759 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3762 /* All other initial characters are errors */
3767 } /* End of high-level switch statement */
3769 /* Failed to recognize the option, or syntax error */
3772 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3773 "option %s\n", arg);
3777 /* If -R or -S have been specified without -q, assume a single queue run. */
3779 if ( (deliver_selectstring || deliver_selectstring_sender)
3780 && queue_interval < 0)
3785 store_pool = old_pool;
3788 /* If usage_wanted is set we call the usage function - which never returns */
3789 if (usage_wanted) exim_usage(called_as);
3791 /* Arguments have been processed. Check for incompatibilities. */
3792 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3793 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3794 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3795 || filter_test != FTEST_NONE
3796 || msg_action_arg > 0 && !one_msg_action
3798 || ( msg_action_arg > 0
3799 && ( f.daemon_listen || queue_interval > 0 || list_options
3800 || checking && msg_action != MSG_LOAD
3801 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3803 || ( (f.daemon_listen || queue_interval > 0)
3804 && ( sender_address || list_options || list_queue || checking
3807 || f.daemon_listen && queue_interval == 0
3808 || f.inetd_wait_mode && queue_interval >= 0
3810 && ( checking || smtp_input || extract_recipients
3811 || filter_test != FTEST_NONE || bi_option
3813 || ( verify_address_mode
3814 && ( f.address_test_mode || smtp_input || extract_recipients
3815 || filter_test != FTEST_NONE || bi_option
3817 || ( f.address_test_mode
3818 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3822 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3824 || deliver_selectstring && queue_interval < 0
3825 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3827 exim_fail("exim: incompatible command-line options or arguments\n");
3829 /* If debugging is set up, set the file and the file descriptor to pass on to
3830 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3831 to run in the foreground. */
3833 if (debug_selector != 0)
3835 debug_file = stderr;
3836 debug_fd = fileno(debug_file);
3837 f.background_daemon = FALSE;
3838 testharness_pause_ms(100); /* lets caller finish */
3839 if (debug_selector != D_v) /* -v only doesn't show this */
3841 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3842 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3844 if (!version_printed)
3845 show_whats_supported(FALSE);
3849 /* When started with root privilege, ensure that the limits on the number of
3850 open files and the number of processes (where that is accessible) are
3851 sufficiently large, or are unset, in case Exim has been called from an
3852 environment where the limits are screwed down. Not all OS have the ability to
3853 change some of these limits. */
3857 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3863 #ifdef RLIMIT_NOFILE
3864 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3866 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3868 rlp.rlim_cur = rlp.rlim_max = 0;
3871 /* I originally chose 1000 as a nice big number that was unlikely to
3872 be exceeded. It turns out that some older OS have a fixed upper limit of
3875 if (rlp.rlim_cur < 1000)
3877 rlp.rlim_cur = rlp.rlim_max = 1000;
3878 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3880 rlp.rlim_cur = rlp.rlim_max = 256;
3881 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3882 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3889 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3891 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3893 rlp.rlim_cur = rlp.rlim_max = 0;
3896 # ifdef RLIM_INFINITY
3897 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3899 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3901 if (rlp.rlim_cur < 1000)
3903 rlp.rlim_cur = rlp.rlim_max = 1000;
3905 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3906 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3912 /* Exim is normally entered as root (but some special configurations are
3913 possible that don't do this). However, it always spins off sub-processes that
3914 set their uid and gid as required for local delivery. We don't want to pass on
3915 any extra groups that root may belong to, so we want to get rid of them all at
3918 We need to obey setgroups() at this stage, before possibly giving up root
3919 privilege for a changed configuration file, but later on we might need to
3920 check on the additional groups for the admin user privilege - can't do that
3921 till after reading the config, which might specify the exim gid. Therefore,
3922 save the group list here first. */
3924 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3925 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3927 /* There is a fundamental difference in some BSD systems in the matter of
3928 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3929 known not to be different. On the "different" systems there is a single group
3930 list, and the first entry in it is the current group. On all other versions of
3931 Unix there is a supplementary group list, which is in *addition* to the current
3932 group. Consequently, to get rid of all extraneous groups on a "standard" system
3933 you pass over 0 groups to setgroups(), while on a "different" system you pass
3934 over a single group - the current group, which is always the first group in the
3935 list. Calling setgroups() with zero groups on a "different" system results in
3936 an error return. The following code should cope with both types of system.
3938 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3939 the "setgroups() with zero groups" - and changes the egid.
3940 Thanks to that we had to stash the original_egid above, for use below
3941 in the call to exim_setugid().
3943 However, if this process isn't running as root, setgroups() can't be used
3944 since you have to be root to run it, even if throwing away groups.
3945 Except, sigh, for Hurd - where you can.
3946 Not being root here happens only in some unusual configurations. */
3949 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3950 && setgroups(0, NULL) != 0
3952 && setgroups(1, group_list) != 0)
3953 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3955 /* If the configuration file name has been altered by an argument on the
3956 command line (either a new file name or a macro definition) and the caller is
3957 not root, or if this is a filter testing run, remove any setuid privilege the
3958 program has and run as the underlying user.
3960 The exim user is locked out of this, which severely restricts the use of -C
3963 Otherwise, set the real ids to the effective values (should be root unless run
3964 from inetd, which it can either be root or the exim uid, if one is configured).
3966 There is a private mechanism for bypassing some of this, in order to make it
3967 possible to test lots of configurations automatically, without having either to
3968 recompile each time, or to patch in an actual configuration file name and other
3969 values (such as the path name). If running in the test harness, pretend that
3970 configuration file changes and macro definitions haven't happened. */
3973 (!f.trusted_config || /* Config changed, or */
3974 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3975 real_uid != root_uid && /* Not root, and */
3976 !f.running_in_test_harness /* Not fudged */
3978 expansion_test /* expansion testing */
3980 filter_test != FTEST_NONE) /* Filter testing */
3982 setgroups(group_count, group_list);
3983 exim_setugid(real_uid, real_gid, FALSE,
3984 US"-C, -D, -be or -bf forces real uid");
3985 removed_privilege = TRUE;
3987 /* In the normal case when Exim is called like this, stderr is available
3988 and should be used for any logging information because attempts to write
3989 to the log will usually fail. To arrange this, we unset really_exim. However,
3990 if no stderr is available there is no point - we might as well have a go
3991 at the log (if it fails, syslog will be written).
3993 Note that if the invoker is Exim, the logs remain available. Messing with
3994 this causes unlogged successful deliveries. */
3996 if (log_stderr && real_uid != exim_uid)
3997 f.really_exim = FALSE;
4000 /* Privilege is to be retained for the moment. It may be dropped later,
4001 depending on the job that this Exim process has been asked to do. For now, set
4002 the real uid to the effective so that subsequent re-execs of Exim are done by a
4006 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4008 /* If testing a filter, open the file(s) now, before wasting time doing other
4009 setups and reading the message. */
4011 if (filter_test & FTEST_SYSTEM)
4012 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4013 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4016 if (filter_test & FTEST_USER)
4017 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4018 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4021 /* Initialise lookup_list
4022 If debugging, already called above via version reporting.
4023 In either case, we initialise the list of available lookups while running
4024 as root. All dynamically modules are loaded from a directory which is
4025 hard-coded into the binary and is code which, if not a module, would be
4026 part of Exim already. Ability to modify the content of the directory
4027 is equivalent to the ability to modify a setuid binary!
4029 This needs to happen before we read the main configuration. */
4032 /*XXX this excrescence could move to the testsuite standard config setup file */
4034 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4037 /* Read the main runtime configuration data; this gives up if there
4038 is a failure. It leaves the configuration file open so that the subsequent
4039 configuration data for delivery can be read if needed.
4041 NOTE: immediately after opening the configuration file we change the working
4042 directory to "/"! Later we change to $spool_directory. We do it there, because
4043 during readconf_main() some expansion takes place already. */
4045 /* Store the initial cwd before we change directories. Can be NULL if the
4046 dir has already been unlinked. */
4047 initial_cwd = os_getcwd(NULL, 0);
4048 if (!initial_cwd && errno)
4049 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4051 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4052 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4055 -be[m] expansion test -
4056 -b[fF] filter test new
4058 -bmalware malware_test_file new
4060 -brw rewrite test new
4062 -bv[s] address verify -
4064 -bP <option> (except -bP config, which sets list_config)
4066 If any of these options is set, we suppress warnings about configuration
4067 issues (currently about tls_advertise_hosts and keep_environment not being
4071 int old_pool = store_pool;
4072 #ifdef MEASURE_TIMING
4074 (void)gettimeofday(&t0, NULL);
4077 store_pool = POOL_CONFIG;
4078 readconf_main(checking || list_options);
4079 store_pool = old_pool;
4081 #ifdef MEASURE_TIMING
4082 report_time_since(&t0, US"readconf_main (delta)");
4086 /* Now in directory "/" */
4088 if (cleanup_environment() == FALSE)
4089 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4092 /* If an action on specific messages is requested, or if a daemon or queue
4093 runner is being started, we need to know if Exim was called by an admin user.
4094 This is the case if the real user is root or exim, or if the real group is
4095 exim, or if one of the supplementary groups is exim or a group listed in
4096 admin_groups. We don't fail all message actions immediately if not admin_user,
4097 since some actions can be performed by non-admin users. Instead, set admin_user
4098 for later interrogation. */
4100 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4101 f.admin_user = TRUE;
4103 for (int i = 0; i < group_count && !f.admin_user; i++)
4104 if (group_list[i] == exim_gid)
4105 f.admin_user = TRUE;
4106 else if (admin_groups)
4107 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4108 if (admin_groups[j] == group_list[i])
4109 f.admin_user = TRUE;
4111 /* Another group of privileged users are the trusted users. These are root,
4112 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4113 are permitted to specify sender_addresses with -f on the command line, and
4114 other message parameters as well. */
4116 if (real_uid == root_uid || real_uid == exim_uid)
4117 f.trusted_caller = TRUE;
4121 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4122 if (trusted_users[i] == real_uid)
4123 f.trusted_caller = TRUE;
4126 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4127 if (trusted_groups[i] == real_gid)
4128 f.trusted_caller = TRUE;
4129 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4130 if (trusted_groups[i] == group_list[j])
4131 f.trusted_caller = TRUE;
4134 /* At this point, we know if the user is privileged and some command-line
4135 options become possibly impermissible, depending upon the configuration file. */
4137 if (checking && commandline_checks_require_admin && !f.admin_user)
4138 exim_fail("exim: those command-line flags are set to require admin\n");
4140 /* Handle the decoding of logging options. */
4142 decode_bits(log_selector, log_selector_size, log_notall,
4143 log_selector_string, log_options, log_options_count, US"log", 0);
4147 debug_printf("configuration file is %s\n", config_main_filename);
4148 debug_printf("log selectors =");
4149 for (int i = 0; i < log_selector_size; i++)
4150 debug_printf(" %08x", log_selector[i]);
4154 /* If domain literals are not allowed, check the sender address that was
4155 supplied with -f. Ditto for a stripped trailing dot. */
4159 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4160 exim_fail("exim: bad -f address \"%s\": domain literals not "
4161 "allowed\n", sender_address);
4162 if (f_end_dot && !strip_trailing_dot)
4163 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4164 "(trailing dot not allowed)\n", sender_address);
4167 /* See if an admin user overrode our logging. */
4169 if (cmdline_syslog_name)
4172 syslog_processname = cmdline_syslog_name;
4173 log_file_path = string_copy(CUS"syslog");
4176 /* not a panic, non-privileged users should not be able to spam paniclog */
4178 "exim: you lack sufficient privilege to specify syslog process name\n");
4180 /* Paranoia check of maximum lengths of certain strings. There is a check
4181 on the length of the log file path in log.c, which will come into effect
4182 if there are any calls to write the log earlier than this. However, if we
4183 get this far but the string is very long, it is better to stop now than to
4184 carry on and (e.g.) receive a message and then have to collapse. The call to
4185 log_write() from here will cause the ultimate panic collapse if the complete
4186 file name exceeds the buffer length. */
4188 if (Ustrlen(log_file_path) > 200)
4189 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4190 "log_file_path is longer than 200 chars: aborting");
4192 if (Ustrlen(pid_file_path) > 200)
4193 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4194 "pid_file_path is longer than 200 chars: aborting");
4196 if (Ustrlen(spool_directory) > 200)
4197 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4198 "spool_directory is longer than 200 chars: aborting");
4200 /* Length check on the process name given to syslog for its TAG field,
4201 which is only permitted to be 32 characters or less. See RFC 3164. */
4203 if (Ustrlen(syslog_processname) > 32)
4204 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4205 "syslog_processname is longer than 32 chars: aborting");
4210 log_write(0, LOG_MAIN, "%s", log_oneline);
4211 return EXIT_SUCCESS;
4214 return EXIT_FAILURE;
4216 /* In some operating systems, the environment variable TMPDIR controls where
4217 temporary files are created; Exim doesn't use these (apart from when delivering
4218 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4219 If TMPDIR is found in the environment, reset it to the value defined in the
4220 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4221 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4222 EXIM_TMPDIR by the build scripts.
4226 if (environ) for (uschar ** p = USS environ; *p; p++)
4227 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4229 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4230 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4232 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4236 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4237 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4238 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4239 called by a user who has set the TZ variable. This then affects the timestamps
4240 in log files and in Received: headers, and any created Date: header lines. The
4241 required timezone is settable in the configuration file, so nothing can be done
4242 about this earlier - but hopefully nothing will normally be logged earlier than
4243 this. We have to make a new environment if TZ is wrong, but don't bother if
4244 timestamps_utc is set, because then all times are in UTC anyway. */
4246 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4247 f.timestamps_utc = TRUE;
4250 uschar *envtz = US getenv("TZ");
4252 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4253 : timezone_string != NULL
4256 uschar **p = USS environ;
4260 if (environ) while (*p++) count++;
4261 if (!envtz) count++;
4262 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4263 if (environ) for (p = USS environ; *p; p++)
4264 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4265 if (timezone_string)
4267 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4268 sprintf(CS *newp++, "TZ=%s", timezone_string);
4273 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4274 tod_stamp(tod_log));
4278 /* Handle the case when we have removed the setuid privilege because of -C or
4279 -D. This means that the caller of Exim was not root.
4281 There is a problem if we were running as the Exim user. The sysadmin may
4282 expect this case to retain privilege because "the binary was called by the
4283 Exim user", but it hasn't, because either the -D option set macros, or the
4284 -C option set a non-trusted configuration file. There are two possibilities:
4286 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4287 to do message deliveries. Thus, the fact that it is running as a
4288 non-privileged user is plausible, and might be wanted in some special
4289 configurations. However, really_exim will have been set false when
4290 privilege was dropped, to stop Exim trying to write to its normal log
4291 files. Therefore, re-enable normal log processing, assuming the sysadmin
4292 has set up the log directory correctly.
4294 (2) If deliver_drop_privilege is not set, the configuration won't work as
4295 apparently intended, and so we log a panic message. In order to retain
4296 root for -C or -D, the caller must either be root or be invoking a
4297 trusted configuration file (when deliver_drop_privilege is false). */
4299 if ( removed_privilege
4300 && (!f.trusted_config || opt_D_used)
4301 && real_uid == exim_uid)
4302 if (deliver_drop_privilege)
4303 f.really_exim = TRUE; /* let logging work normally */
4305 log_write(0, LOG_MAIN|LOG_PANIC,
4306 "exim user lost privilege for using %s option",
4307 f.trusted_config? "-D" : "-C");
4309 /* Start up Perl interpreter if Perl support is configured and there is a
4310 perl_startup option, and the configuration or the command line specifies
4311 initializing starting. Note that the global variables are actually called
4312 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4315 if (perl_start_option != 0)
4316 opt_perl_at_start = (perl_start_option > 0);
4317 if (opt_perl_at_start && opt_perl_startup != NULL)
4320 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4321 if ((errstr = init_perl(opt_perl_startup)))
4322 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4323 opt_perl_started = TRUE;
4325 #endif /* EXIM_PERL */
4327 /* Log the arguments of the call if the configuration file said so. This is
4328 a debugging feature for finding out what arguments certain MUAs actually use.
4329 Don't attempt it if logging is disabled, or if listing variables or if
4330 verifying/testing addresses or expansions. */
4332 if ( (debug_selector & D_any || LOGGING(arguments))
4333 && f.really_exim && !list_options && !checking)
4335 uschar *p = big_buffer;
4336 Ustrcpy(p, US"cwd= (failed)");
4343 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4344 p += Ustrlen(CCS p);
4347 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4349 for (int i = 0; i < argc; i++)
4351 int len = Ustrlen(argv[i]);
4352 const uschar *printing;
4354 if (p + len + 8 >= big_buffer + big_buffer_size)
4356 Ustrcpy(p, US" ...");
4357 log_write(0, LOG_MAIN, "%s", big_buffer);
4358 Ustrcpy(big_buffer, US"...");
4361 printing = string_printing(argv[i]);
4362 if (!*printing) quote = US"\"";
4365 const uschar *pp = printing;
4367 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4369 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4370 (p - big_buffer) - 4), printing, quote);
4373 if (LOGGING(arguments))
4374 log_write(0, LOG_MAIN, "%s", big_buffer);
4376 debug_printf("%s\n", big_buffer);
4379 /* Set the working directory to be the top-level spool directory. We don't rely
4380 on this in the code, which always uses fully qualified names, but it's useful
4381 for core dumps etc. Don't complain if it fails - the spool directory might not
4382 be generally accessible and calls with the -C option (and others) have lost
4383 privilege by now. Before the chdir, we try to ensure that the directory exists.
4386 if (Uchdir(spool_directory) != 0)
4388 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4389 (void) Uchdir(spool_directory);
4392 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4393 alias file. Exim doesn't have such a concept, but this call is screwed into
4394 Sun's YP makefiles. Handle this by calling a configured script, as the real
4395 user who called Exim. The -oA option can be used to pass an argument to the
4400 (void) fclose(config_file);
4401 if (bi_command && *bi_command)
4405 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4406 if (alias_arg) argv[i++] = alias_arg;
4409 setgroups(group_count, group_list);
4410 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4412 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4413 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4415 execv(CS argv[0], (char *const *)argv);
4416 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4420 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4425 /* We moved the admin/trusted check to be immediately after reading the
4426 configuration file. We leave these prints here to ensure that syslog setup,
4427 logfile setup, and so on has already happened. */
4429 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4430 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4432 /* Only an admin user may start the daemon or force a queue run in the default
4433 configuration, but the queue run restriction can be relaxed. Only an admin
4434 user may request that a message be returned to its sender forthwith. Only an
4435 admin user may specify a debug level greater than D_v (because it might show
4436 passwords, etc. in lookup queries). Only an admin user may request a queue
4437 count. Only an admin user can use the test interface to scan for email
4438 (because Exim will be in the spool dir and able to look at mails). */
4442 BOOL debugset = (debug_selector & ~D_v) != 0;
4443 if ( deliver_give_up || f.daemon_listen || malware_test_file
4444 || count_queue && queue_list_requires_admin
4445 || list_queue && queue_list_requires_admin
4446 || queue_interval >= 0 && prod_requires_admin
4447 || queue_name_dest && prod_requires_admin
4448 || debugset && !f.running_in_test_harness
4450 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4453 /* If the real user is not root or the exim uid, the argument for passing
4454 in an open TCP/IP connection for another message is not permitted, nor is
4455 running with the -N option for any delivery action, unless this call to exim is
4456 one that supplied an input message, or we are using a patched exim for
4457 regression testing. */
4459 if ( real_uid != root_uid && real_uid != exim_uid
4460 && ( continue_hostname
4462 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4464 && !f.running_in_test_harness
4466 exim_fail("exim: Permission denied\n");
4468 /* If the caller is not trusted, certain arguments are ignored when running for
4469 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4470 Note that authority for performing certain actions on messages is tested in the
4471 queue_action() function. */
4473 if (!f.trusted_caller && !checking)
4475 sender_host_name = sender_host_address = interface_address =
4476 sender_ident = received_protocol = NULL;
4477 sender_host_port = interface_port = 0;
4478 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4481 /* If a sender host address is set, extract the optional port number off the
4482 end of it and check its syntax. Do the same thing for the interface address.
4483 Exim exits if the syntax is bad. */
4487 if (sender_host_address)
4488 sender_host_port = check_port(sender_host_address);
4489 if (interface_address)
4490 interface_port = check_port(interface_address);
4493 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4496 if (f.trusted_caller)
4498 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4499 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4502 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4505 /* If an SMTP message is being received check to see if the standard input is a
4506 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4507 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4512 union sockaddr_46 inetd_sock;
4513 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4514 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4516 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4517 if (family == AF_INET || family == AF_INET6)
4519 union sockaddr_46 interface_sock;
4520 size = sizeof(interface_sock);
4522 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4523 interface_address = host_ntoa(-1, &interface_sock, NULL,
4526 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4528 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4531 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4532 NULL, &sender_host_port);
4533 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4534 "inetd is not supported when mua_wrapper is set");
4538 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4543 /* If the load average is going to be needed while receiving a message, get it
4544 now for those OS that require the first call to os_getloadavg() to be done as
4545 root. There will be further calls later for each message received. */
4547 #ifdef LOAD_AVG_NEEDS_ROOT
4548 if ( receiving_message
4549 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4550 load_average = OS_GETLOADAVG();
4553 /* The queue_only configuration option can be overridden by -odx on the command
4554 line, except that if queue_only_override is false, queue_only cannot be unset
4555 from the command line. */
4557 if (queue_only_set && (queue_only_override || arg_queue_only))
4558 queue_only = arg_queue_only;
4560 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4563 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4564 if (arg_smtp_receive_timeout >= 0)
4565 smtp_receive_timeout = arg_smtp_receive_timeout;
4567 /* If Exim was started with root privilege, unless we have already removed the
4568 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4569 except when starting the daemon or doing some kind of delivery or address
4570 testing (-bt). These are the only cases when root need to be retained. We run
4571 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4572 retained only for starting the daemon. We always do the initgroups() in this
4573 situation (controlled by the TRUE below), in order to be as close as possible
4574 to the state Exim usually runs in. */
4576 if ( !unprivileged /* originally had root AND */
4577 && !removed_privilege /* still got root AND */
4578 && !f.daemon_listen /* not starting the daemon */
4579 && queue_interval <= 0 /* (either kind of daemon) */
4580 && ( /* AND EITHER */
4581 deliver_drop_privilege /* requested unprivileged */
4583 queue_interval < 0 /* not running the queue */
4584 && ( msg_action_arg < 0 /* and */
4585 || msg_action != MSG_DELIVER /* not delivering */
4587 && (!checking || !f.address_test_mode) /* not address checking */
4588 && !rcpt_verify_quota /* and not quota checking */
4590 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4592 /* When we are retaining a privileged uid, we still change to the exim gid. */
4597 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4598 rv = setgid(exim_gid);
4599 /* Impact of failure is that some stuff might end up with an incorrect group.
4600 We track this for failures from root, since any attempt to change privilege
4601 by root should succeed and failures should be examined. For non-root,
4602 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4603 no need to complain then. */
4605 if (!(unprivileged || removed_privilege))
4606 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4609 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4610 (long int)exim_gid, strerror(errno));
4614 /* Handle a request to scan a file for malware */
4615 if (malware_test_file)
4617 #ifdef WITH_CONTENT_SCAN
4619 set_process_info("scanning file for malware");
4620 if ((result = malware_in_file(malware_test_file)) == FAIL)
4622 printf("No malware found.\n");
4627 printf("Malware lookup returned non-okay/fail: %d\n", result);
4631 printf("Malware found: %s\n", malware_name);
4633 printf("Malware scan detected malware of unknown name.\n");
4635 printf("Malware scanning not enabled at compile time.\n");
4640 /* Handle a request to list the delivery queue */
4644 set_process_info("listing the queue");
4645 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4649 /* Handle a request to count the delivery queue */
4653 set_process_info("counting the queue");
4654 fprintf(stdout, "%u\n", queue_count());
4658 /* Handle actions on specific messages, except for the force delivery and
4659 message load actions, which are done below. Some actions take a whole list of
4660 message ids, which are known to continue up to the end of the arguments. Others
4661 take a single message id and then operate on the recipients list. */
4663 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4665 int yield = EXIT_SUCCESS;
4666 set_process_info("acting on specified messages");
4668 /* ACL definitions may be needed when removing a message (-Mrm) because
4669 event_action gets expanded */
4671 if (msg_action == MSG_REMOVE)
4673 int old_pool = store_pool;
4674 store_pool = POOL_CONFIG;
4676 store_pool = old_pool;
4677 store_writeprotect(POOL_CONFIG);
4680 if (!one_msg_action)
4682 for (i = msg_action_arg; i < argc; i++)
4683 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4684 yield = EXIT_FAILURE;
4687 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4688 default: printf("\n"); break;
4692 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4693 recipients_arg)) yield = EXIT_FAILURE;
4697 /* We used to set up here to skip reading the ACL section, on
4698 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4699 Now, since the intro of the ${acl } expansion, ACL definitions may be
4700 needed in transports so we lost the optimisation. */
4703 int old_pool = store_pool;
4704 #ifdef MEASURE_TIMING
4706 (void)gettimeofday(&t0, NULL);
4709 store_pool = POOL_CONFIG;
4711 store_pool = old_pool;
4713 /* -be can add macro definitions, needing to link to the macro structure
4714 chain. Otherwise, make the memory used for config data readonly. */
4716 if (!expansion_test)
4717 store_writeprotect(POOL_CONFIG);
4719 #ifdef MEASURE_TIMING
4720 report_time_since(&t0, US"readconf_rest (delta)");
4724 /* Handle a request to check quota */
4725 if (rcpt_verify_quota)
4726 if (real_uid != root_uid && real_uid != exim_uid)
4727 exim_fail("exim: Permission denied\n");
4728 else if (recipients_arg >= argc)
4729 exim_fail("exim: missing recipient for quota check\n");
4732 verify_quota(argv[recipients_arg]);
4733 exim_exit(EXIT_SUCCESS);
4736 /* Handle the -brt option. This is for checking out retry configurations.
4737 The next three arguments are a domain name or a complete address, and
4738 optionally two error numbers. All it does is to call the function that
4739 scans the retry configuration data. */
4741 if (test_retry_arg >= 0)
4743 retry_config *yield;
4744 int basic_errno = 0;
4746 const uschar *s1, *s2;
4748 if (test_retry_arg >= argc)
4750 printf("-brt needs a domain or address argument\n");
4751 exim_exit(EXIT_FAILURE);
4753 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4756 /* If the first argument contains no @ and no . it might be a local user
4757 or it might be a single-component name. Treat as a domain. */
4759 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4761 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4762 "being \ntreated as a one-component domain, not as a local part.\n\n",
4766 /* There may be an optional second domain arg. */
4768 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4769 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4771 /* The final arg is an error name */
4773 if (test_retry_arg < argc)
4775 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4777 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4780 printf("%s\n", CS error);
4781 return EXIT_FAILURE;
4784 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4785 code > 100 as an error is for matching codes to the decade. Turn them into
4786 a real error code, off the decade. */
4788 if (basic_errno == ERRNO_MAIL4XX ||
4789 basic_errno == ERRNO_RCPT4XX ||
4790 basic_errno == ERRNO_DATA4XX)
4792 int code = (more_errno >> 8) & 255;
4794 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4795 else if (code > 100)
4796 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4800 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4801 printf("No retry information found\n");
4804 more_errno = yield->more_errno;
4805 printf("Retry rule: %s ", yield->pattern);
4807 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4809 printf("quota%s%s ",
4810 (more_errno > 0)? "_" : "",
4811 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4813 else if (yield->basic_errno == ECONNREFUSED)
4815 printf("refused%s%s ",
4816 (more_errno > 0)? "_" : "",
4817 (more_errno == 'M')? "MX" :
4818 (more_errno == 'A')? "A" : "");
4820 else if (yield->basic_errno == ETIMEDOUT)
4823 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4825 if (more_errno != 0) printf("_%s",
4826 (more_errno == 'M')? "MX" : "A");
4829 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4830 printf("auth_failed ");
4833 for (retry_rule * r = yield->rules; r; r = r->next)
4835 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4836 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4842 printf(",%d.", x/1000);
4856 exim_exit(EXIT_SUCCESS);
4859 /* Handle a request to list one or more configuration options */
4860 /* If -n was set, we suppress some information */
4865 set_process_info("listing variables");
4866 if (recipients_arg >= argc)
4867 fail = !readconf_print(US"all", NULL, flag_n);
4868 else for (i = recipients_arg; i < argc; i++)
4871 (Ustrcmp(argv[i], "router") == 0 ||
4872 Ustrcmp(argv[i], "transport") == 0 ||
4873 Ustrcmp(argv[i], "authenticator") == 0 ||
4874 Ustrcmp(argv[i], "macro") == 0 ||
4875 Ustrcmp(argv[i], "environment") == 0))
4877 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4881 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4883 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4888 set_process_info("listing config");
4889 exim_exit(readconf_print(US"config", NULL, flag_n)
4890 ? EXIT_SUCCESS : EXIT_FAILURE);
4894 /* Initialise subsystems as required. */
4898 /* Handle a request to deliver one or more messages that are already on the
4899 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4900 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4902 Delivery of specific messages is typically used for a small number when
4903 prodding by hand (when the option forced_delivery will be set) or when
4904 re-execing to regain root privilege. Each message delivery must happen in a
4905 separate process, so we fork a process for each one, and run them sequentially
4906 so that debugging output doesn't get intertwined, and to avoid spawning too
4907 many processes if a long list is given. However, don't fork for the last one;
4908 this saves a process in the common case when Exim is called to deliver just one
4911 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4913 if (prod_requires_admin && !f.admin_user)
4915 fprintf(stderr, "exim: Permission denied\n");
4916 exim_exit(EXIT_FAILURE);
4918 set_process_info("delivering specified messages");
4919 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4920 for (i = msg_action_arg; i < argc; i++)
4924 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4925 that runs into a later copy into the untainted global message_id[] */
4926 /*XXX Do we need a length limit check here? */
4928 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4929 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4931 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4932 exim_underbar_exit(EXIT_SUCCESS);
4936 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4938 exim_exit(EXIT_FAILURE);
4942 exim_exit(EXIT_SUCCESS);
4946 /* If only a single queue run is requested, without SMTP listening, we can just
4947 turn into a queue runner, with an optional starting message id. */
4949 if (queue_interval == 0 && !f.daemon_listen)
4951 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4952 start_queue_run_id ? US" starting at " : US"",
4953 start_queue_run_id ? start_queue_run_id: US"",
4954 stop_queue_run_id ? US" stopping at " : US"",
4955 stop_queue_run_id ? stop_queue_run_id : US"");
4957 set_process_info("running the '%s' queue (single queue run)", queue_name);
4959 set_process_info("running the queue (single queue run)");
4960 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4961 exim_exit(EXIT_SUCCESS);
4965 /* Find the login name of the real user running this process. This is always
4966 needed when receiving a message, because it is written into the spool file. It
4967 may also be used to construct a from: or a sender: header, and in this case we
4968 need the user's full name as well, so save a copy of it, checked for RFC822
4969 syntax and munged if necessary, if it hasn't previously been set by the -F
4970 argument. We may try to get the passwd entry more than once, in case NIS or
4971 other delays are in evidence. Save the home directory for use in filter testing
4976 if ((pw = getpwuid(real_uid)) != NULL)
4978 originator_login = string_copy(US pw->pw_name);
4979 originator_home = string_copy(US pw->pw_dir);
4981 /* If user name has not been set by -F, set it from the passwd entry
4982 unless -f has been used to set the sender address by a trusted user. */
4984 if (!originator_name)
4986 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4988 uschar *name = US pw->pw_gecos;
4989 uschar *amp = Ustrchr(name, '&');
4992 /* Most Unix specify that a '&' character in the gecos field is
4993 replaced by a copy of the login name, and some even specify that
4994 the first character should be upper cased, so that's what we do. */
4999 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5000 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5001 buffer[loffset] = toupper(buffer[loffset]);
5005 /* If a pattern for matching the gecos field was supplied, apply
5006 it and then expand the name string. */
5008 if (gecos_pattern && gecos_name)
5010 const pcre2_code *re;
5011 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5013 if (regex_match_and_setup(re, name, 0, -1))
5015 uschar *new_name = expand_string(gecos_name);
5019 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5020 "gecos field \"%s\"\n", new_name, name);
5023 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5024 "\"%s\": %s\n", gecos_name, expand_string_message);
5026 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5027 "gecos field \"%s\"\n", gecos_pattern, name);
5028 store_free((void *)re);
5030 originator_name = string_copy(name);
5033 /* A trusted caller has used -f but not -F */
5035 else originator_name = US"";
5038 /* Break the retry loop */
5043 if (++i > finduser_retries) break;
5047 /* If we cannot get a user login, log the incident and give up, unless the
5048 configuration specifies something to use. When running in the test harness,
5049 any setting of unknown_login overrides the actual name. */
5051 if (!originator_login || f.running_in_test_harness)
5055 originator_login = expand_string(unknown_login);
5056 if (!originator_name && unknown_username)
5057 originator_name = expand_string(unknown_username);
5058 if (!originator_name) originator_name = US"";
5060 if (!originator_login)
5061 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5065 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5068 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5070 /* If a message is created by this call of Exim, the uid/gid of its originator
5071 are those of the caller. These values are overridden if an existing message is
5072 read in from the spool. */
5074 originator_uid = real_uid;
5075 originator_gid = real_gid;
5077 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5078 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5080 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5081 returns. We leave this till here so that the originator_ fields are available
5082 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5085 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5089 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5090 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5091 "mua_wrapper is set");
5094 # ifndef DISABLE_TLS
5095 /* This also checks that the library linkage is working and we can call
5096 routines in it, so call even if tls_require_ciphers is unset */
5098 # ifdef MEASURE_TIMING
5100 (void)gettimeofday(&t0, NULL);
5102 if (!tls_dropprivs_validate_require_cipher(FALSE))
5104 # ifdef MEASURE_TIMING
5105 report_time_since(&t0, US"validate_ciphers (delta)");
5113 /* If the sender ident has not been set (by a trusted caller) set it to
5114 the caller. This will get overwritten below for an inetd call. If a trusted
5115 caller has set it empty, unset it. */
5117 if (!sender_ident) sender_ident = originator_login;
5118 else if (!*sender_ident) sender_ident = NULL;
5120 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5121 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5122 originator_* variables set. */
5124 if (test_rewrite_arg >= 0)
5126 f.really_exim = FALSE;
5127 if (test_rewrite_arg >= argc)
5129 printf("-brw needs an address argument\n");
5130 exim_exit(EXIT_FAILURE);
5132 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5133 exim_exit(EXIT_SUCCESS);
5136 /* A locally-supplied message is considered to be coming from a local user
5137 unless a trusted caller supplies a sender address with -f, or is passing in the
5138 message via SMTP (inetd invocation or otherwise). */
5140 if ( !sender_address && !smtp_input
5141 || !f.trusted_caller && filter_test == FTEST_NONE)
5143 f.sender_local = TRUE;
5145 /* A trusted caller can supply authenticated_sender and authenticated_id
5146 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5147 defaults except when host checking. */
5149 if (!authenticated_sender && !host_checking)
5150 authenticated_sender = string_sprintf("%s@%s", originator_login,
5151 qualify_domain_sender);
5152 if (!authenticated_id && !host_checking)
5153 authenticated_id = originator_login;
5156 /* Trusted callers are always permitted to specify the sender address.
5157 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5158 is specified is the empty address. However, if a trusted caller does not
5159 specify a sender address for SMTP input, we leave sender_address unset. This
5160 causes the MAIL commands to be honoured. */
5162 if ( !smtp_input && !sender_address
5163 || !receive_check_set_sender(sender_address))
5165 /* Either the caller is not permitted to set a general sender, or this is
5166 non-SMTP input and the trusted caller has not set a sender. If there is no
5167 sender, or if a sender other than <> is set, override with the originator's
5168 login (which will get qualified below), except when checking things. */
5170 if ( !sender_address /* No sender_address set */
5172 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5173 !checking)) /* Not running tests, including filter tests */
5175 sender_address = originator_login;
5176 f.sender_address_forced = FALSE;
5177 sender_address_domain = 0;
5181 /* Remember whether an untrusted caller set the sender address */
5183 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5185 /* Ensure that the sender address is fully qualified unless it is the empty
5186 address, which indicates an error message, or doesn't exist (root caller, smtp
5187 interface, no -f argument). */
5189 if (sender_address && *sender_address && sender_address_domain == 0)
5190 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5191 qualify_domain_sender);
5193 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5195 /* Handle a request to verify a list of addresses, or test them for delivery.
5196 This must follow the setting of the sender address, since routers can be
5197 predicated upon the sender. If no arguments are given, read addresses from
5198 stdin. Set debug_level to at least D_v to get full output for address testing.
5201 if (verify_address_mode || f.address_test_mode)
5204 int flags = vopt_qualify;
5206 if (verify_address_mode)
5208 if (!verify_as_sender) flags |= vopt_is_recipient;
5209 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5214 flags |= vopt_is_recipient;
5215 debug_selector |= D_v;
5216 debug_file = stderr;
5217 debug_fd = fileno(debug_file);
5218 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5221 if (recipients_arg < argc)
5222 while (recipients_arg < argc)
5224 /* Supplied addresses are tainted since they come from a user */
5225 uschar * s = string_copy_taint(
5226 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5230 BOOL finished = FALSE;
5231 uschar *ss = parse_find_address_end(s, FALSE);
5232 if (*ss == ',') *ss = 0; else finished = TRUE;
5233 test_address(s, flags, &exit_value);
5236 while (*++s == ',' || isspace(*s)) ;
5242 uschar * s = get_stdinput(NULL, NULL);
5244 test_address(string_copy_taint(
5245 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5247 flags, &exit_value);
5251 exim_exit(exit_value);
5254 /* Handle expansion checking. Either expand items on the command line, or read
5255 from stdin if there aren't any. If -Mset was specified, load the message so
5256 that its variables can be used, but restrict this facility to admin users.
5257 Otherwise, if -bem was used, read a message from stdin. */
5261 dns_init(FALSE, FALSE, FALSE);
5262 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5266 exim_fail("exim: permission denied\n");
5267 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5268 /* Checking the length of the ID is sufficient to validate it.
5269 Get an untainted version so file opens can be done. */
5270 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5272 spoolname = string_sprintf("%s-H", message_id);
5273 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5274 printf ("Failed to load message datafile %s\n", message_id);
5275 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5276 printf ("Failed to load message %s\n", message_id);
5279 /* Read a test message from a file. We fudge it up to be on stdin, saving
5280 stdin itself for later reading of expansion strings. */
5282 else if (expansion_test_message)
5284 int save_stdin = dup(0);
5285 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5287 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5290 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5291 message_ended = END_NOTENDED;
5292 read_message_body(receive_msg(extract_recipients));
5293 message_linecount += body_linecount;
5294 (void)dup2(save_stdin, 0);
5295 (void)close(save_stdin);
5296 clearerr(stdin); /* Required by Darwin */
5299 /* Only admin users may see config-file macros this way */
5301 if (!f.admin_user) macros_user = macros = mlast = NULL;
5303 /* Allow $recipients for this testing */
5305 f.enable_dollar_recipients = TRUE;
5307 /* Expand command line items */
5309 if (recipients_arg < argc)
5310 while (recipients_arg < argc)
5311 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5317 char *(*fn_readline)(const char *) = NULL;
5318 void (*fn_addhist)(const char *) = NULL;
5322 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5325 while (s = get_stdinput(fn_readline, fn_addhist))
5326 expansion_test_line(s);
5329 if (dlhandle) dlclose(dlhandle);
5333 /* The data file will be open after -Mset */
5335 if (deliver_datafile >= 0)
5337 (void)close(deliver_datafile);
5338 deliver_datafile = -1;
5341 exim_exit(EXIT_SUCCESS);
5345 /* The active host name is normally the primary host name, but it can be varied
5346 for hosts that want to play several parts at once. We need to ensure that it is
5347 set for host checking, and for receiving messages. */
5349 smtp_active_hostname = primary_hostname;
5350 if (raw_active_hostname != NULL)
5352 uschar *nah = expand_string(raw_active_hostname);
5355 if (!f.expand_string_forcedfail)
5356 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5357 "(smtp_active_hostname): %s", raw_active_hostname,
5358 expand_string_message);
5360 else if (nah[0] != 0) smtp_active_hostname = nah;
5363 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5364 given IP address so that the blocking and relay configuration can be tested.
5365 Unless a sender_ident was set by -oMt, we discard it (the default is the
5366 caller's login name). An RFC 1413 call is made only if we are running in the
5367 test harness and an incoming interface and both ports are specified, because
5368 there is no TCP/IP call to find the ident for. */
5375 if (!sender_ident_set)
5377 sender_ident = NULL;
5378 if (f.running_in_test_harness && sender_host_port
5379 && interface_address && interface_port)
5380 verify_get_ident(1223); /* note hardwired port number */
5383 /* In case the given address is a non-canonical IPv6 address, canonicalize
5384 it. The code works for both IPv4 and IPv6, as it happens. */
5386 size = host_aton(sender_host_address, x);
5387 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5388 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5390 /* Now set up for testing */
5392 host_build_sender_fullhost();
5396 f.sender_local = FALSE;
5397 f.sender_host_notsocket = TRUE;
5398 debug_file = stderr;
5399 debug_fd = fileno(debug_file);
5400 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5401 "**** but without any ident (RFC 1413) callback.\n"
5402 "**** This is not for real!\n\n",
5403 sender_host_address);
5405 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5406 if (verify_check_host(&hosts_connection_nolog) == OK)
5408 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5409 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5411 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5413 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5414 because a log line has already been written for all its failure exists
5415 (usually "connection refused: <reason>") and writing another one is
5416 unnecessary clutter. */
5418 if (smtp_start_session())
5421 for (; (reset_point = store_mark()); store_reset(reset_point))
5423 if (smtp_setup_msg() <= 0) break;
5424 if (!receive_msg(FALSE)) break;
5426 return_path = sender_address = NULL;
5427 dnslist_domain = dnslist_matched = NULL;
5428 #ifndef DISABLE_DKIM
5429 dkim_cur_signer = NULL;
5432 deliver_localpart_orig = NULL;
5433 deliver_domain_orig = NULL;
5434 callout_address = sending_ip_address = NULL;
5435 deliver_localpart_data = deliver_domain_data =
5436 recipient_data = sender_data = NULL;
5437 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5441 exim_exit(EXIT_SUCCESS);
5445 /* Arrange for message reception if recipients or SMTP were specified;
5446 otherwise complain unless a version print (-bV) happened or this is a filter
5447 verification test or info dump.
5448 In the former case, show the configuration file name. */
5450 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5452 if (version_printed)
5454 if (Ustrchr(config_main_filelist, ':'))
5455 printf("Configuration file search path is %s\n", config_main_filelist);
5456 printf("Configuration file is %s\n", config_main_filename);
5457 return EXIT_SUCCESS;
5460 if (info_flag != CMDINFO_NONE)
5462 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5463 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5466 if (filter_test == FTEST_NONE)
5467 exim_usage(called_as);
5471 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5472 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5473 that we are not called from inetd, because that is rejected above. The
5474 following configuration settings are forced here:
5476 (1) Synchronous delivery (-odi)
5477 (2) Errors to stderr (-oep == -oeq)
5478 (3) No parallel remote delivery
5479 (4) Unprivileged delivery
5481 We don't force overall queueing options because there are several of them;
5482 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5483 to override any SMTP queueing. */
5487 f.synchronous_delivery = TRUE;
5488 arg_error_handling = ERRORS_STDERR;
5489 remote_max_parallel = 1;
5490 deliver_drop_privilege = TRUE;
5491 f.queue_smtp = FALSE;
5492 queue_smtp_domains = NULL;
5494 message_utf8_downconvert = -1; /* convert-if-needed */
5499 /* Prepare to accept one or more new messages on the standard input. When a
5500 message has been read, its id is returned in message_id[]. If doing immediate
5501 delivery, we fork a delivery process for each received message, except for the
5502 last one, where we can save a process switch.
5504 It is only in non-smtp mode that error_handling is allowed to be changed from
5505 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5506 sendmail error modes other than -oem ever actually used? Later: yes.) */
5508 if (!smtp_input) error_handling = arg_error_handling;
5510 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5511 logging being sent down the socket and make an identd call to get the
5514 else if (f.is_inetd)
5516 (void)fclose(stderr);
5517 exim_nullstd(); /* Re-open to /dev/null */
5518 verify_get_ident(IDENT_PORT);
5519 host_build_sender_fullhost();
5520 set_process_info("handling incoming connection from %s via inetd",
5524 /* If the sender host address has been set, build sender_fullhost if it hasn't
5525 already been done (which it will have been for inetd). This caters for the
5526 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5527 so that the test for IP options is skipped for -bs input. */
5529 if (sender_host_address && !sender_fullhost)
5531 host_build_sender_fullhost();
5532 set_process_info("handling incoming connection from %s via -oMa",
5534 f.sender_host_notsocket = TRUE;
5537 /* Otherwise, set the sender host as unknown except for inetd calls. This
5538 prevents host checking in the case of -bs not from inetd and also for -bS. */
5540 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5542 /* If stdout does not exist, then dup stdin to stdout. This can happen
5543 if exim is started from inetd. In this case fd 0 will be set to the socket,
5544 but fd 1 will not be set. This also happens for passed SMTP channels. */
5546 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5548 /* Set up the incoming protocol name and the state of the program. Root is
5549 allowed to force received protocol via the -oMr option above. If we have come
5550 via inetd, the process info has already been set up. We don't set
5551 received_protocol here for smtp input, as it varies according to
5552 batch/HELO/EHLO/AUTH/TLS. */
5556 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5557 smtp_batched_input? "batched " : "",
5558 sender_address ? sender_address : originator_login);
5562 int old_pool = store_pool;
5563 store_pool = POOL_PERM;
5564 if (!received_protocol)
5565 received_protocol = string_sprintf("local%s", called_as);
5566 store_pool = old_pool;
5567 set_process_info("accepting a local non-SMTP message from <%s>",
5571 /* Initialize the session_local_queue-only flag (this will be ignored if
5572 mua_wrapper is set) */
5575 session_local_queue_only = queue_only;
5577 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5578 the spool if so configured. On failure, we must not attempt to send an error
5579 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5580 error code is given.) */
5582 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5583 exim_fail("exim: insufficient disk space\n");
5585 /* If this is smtp input of any kind, real or batched, handle the start of the
5588 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5589 because a log line has already been written for all its failure exists
5590 (usually "connection refused: <reason>") and writing another one is
5591 unnecessary clutter. */
5597 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5598 if (verify_check_host(&hosts_connection_nolog) == OK)
5600 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5601 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5603 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5604 if (!smtp_start_session())
5607 exim_exit(EXIT_SUCCESS);
5611 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5612 (we handle buferring so as to have visibility of fill level). */
5616 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5617 if (expand_string_message)
5618 if (thismessage_size_limit == -1)
5619 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5620 "message_size_limit: %s", expand_string_message);
5622 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5623 "message_size_limit: %s", expand_string_message);
5625 setvbuf(stdin, NULL, _IONBF, 0);
5628 /* Loop for several messages when reading SMTP input. If we fork any child
5629 processes, we don't want to wait for them unless synchronous delivery is
5630 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5631 same as SIG_DFL, despite the fact that documentation often lists the default as
5632 "ignore". This is a confusing area. This is what I know:
5634 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5635 processes that complete simply to go away without ever becoming defunct. You
5636 can't then wait for them - but we don't want to wait for them in the
5637 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5638 happen for all OS (e.g. *BSD is different).
5640 But that's not the end of the story. Some (many? all?) systems have the
5641 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5642 has by default, so it seems that the difference is merely one of default
5643 (compare restarting vs non-restarting signals).
5645 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5646 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5647 of the loop below. Paranoia rules.
5649 February 2003: That's *still* not the end of the story. There are now versions
5650 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5651 process then calls waitpid(), a grumble is written to the system log, because
5652 this is logically inconsistent. In other words, it doesn't like the paranoia.
5653 As a consequence of this, the waitpid() below is now excluded if we are sure
5654 that SIG_IGN works. */
5656 if (!f.synchronous_delivery)
5659 struct sigaction act;
5660 act.sa_handler = SIG_IGN;
5661 sigemptyset(&(act.sa_mask));
5662 act.sa_flags = SA_NOCLDWAIT;
5663 sigaction(SIGCHLD, &act, NULL);
5665 signal(SIGCHLD, SIG_IGN);
5669 /* Save the current store pool point, for resetting at the start of
5670 each message, and save the real sender address, if any. */
5672 real_sender_address = sender_address;
5674 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5675 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5678 for (BOOL more = TRUE; more; )
5680 rmark reset_point = store_mark();
5683 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5684 input and build the recipients list, before calling receive_msg() to read the
5685 message proper. Whatever sender address is given in the SMTP transaction is
5686 often ignored for local senders - we use the actual sender, which is normally
5687 either the underlying user running this process or a -f argument provided by
5688 a trusted caller. It is saved in real_sender_address. The test for whether to
5689 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5694 if ((rc = smtp_setup_msg()) > 0)
5696 if (real_sender_address != NULL &&
5697 !receive_check_set_sender(sender_address))
5699 sender_address = raw_sender = real_sender_address;
5700 sender_address_unrewritten = NULL;
5703 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5704 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5705 the very end. The result of the ACL is ignored (as for other non-SMTP
5706 messages). It is run for its potential side effects. */
5708 if (smtp_batched_input && acl_not_smtp_start != NULL)
5710 uschar *user_msg, *log_msg;
5711 f.enable_dollar_recipients = TRUE;
5712 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5713 &user_msg, &log_msg);
5714 f.enable_dollar_recipients = FALSE;
5717 /* Now get the data for the message */
5719 more = receive_msg(extract_recipients);
5722 cancel_cutthrough_connection(TRUE, US"receive dropped");
5723 if (more) goto MORELOOP;
5724 smtp_log_no_mail(); /* Log no mail if configured */
5725 exim_exit(EXIT_FAILURE);
5730 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5731 smtp_log_no_mail(); /* Log no mail if configured */
5732 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5736 /* In the non-SMTP case, we have all the information from the command
5737 line, but must process it in case it is in the more general RFC822
5738 format, and in any case, to detect syntax errors. Also, it appears that
5739 the use of comma-separated lists as single arguments is common, so we
5740 had better support them. */
5745 int count = argc - recipients_arg;
5746 uschar **list = argv + recipients_arg;
5748 /* These options cannot be changed dynamically for non-SMTP messages */
5750 f.active_local_sender_retain = local_sender_retain;
5751 f.active_local_from_check = local_from_check;
5753 /* Save before any rewriting */
5755 raw_sender = string_copy(sender_address);
5757 /* Loop for each argument (supplied by user hence tainted) */
5759 for (int i = 0; i < count; i++)
5761 int start, end, domain;
5763 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5764 * We'll still want to cap it to something, just in case. */
5765 uschar * s = string_copy_taint(
5766 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5769 /* Loop for each comma-separated address */
5773 BOOL finished = FALSE;
5775 uschar *ss = parse_find_address_end(s, FALSE);
5777 if (*ss == ',') *ss = 0; else finished = TRUE;
5779 /* Check max recipients - if -t was used, these aren't recipients */
5781 if (recipients_max > 0 && ++rcount > recipients_max &&
5782 !extract_recipients)
5783 if (error_handling == ERRORS_STDERR)
5785 fprintf(stderr, "exim: too many recipients\n");
5786 exim_exit(EXIT_FAILURE);
5790 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5791 errors_sender_rc : EXIT_FAILURE;
5795 BOOL b = allow_utf8_domains;
5796 allow_utf8_domains = TRUE;
5799 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5803 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5804 else allow_utf8_domains = b;
5809 if (domain == 0 && !f.allow_unqualified_recipient)
5812 errmess = US"unqualified recipient address not allowed";
5816 if (error_handling == ERRORS_STDERR)
5818 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5819 string_printing(list[i]), errmess);
5820 exim_exit(EXIT_FAILURE);
5826 eblock.text1 = string_printing(list[i]);
5827 eblock.text2 = errmess;
5829 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5830 errors_sender_rc : EXIT_FAILURE;
5833 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5836 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5840 /* Show the recipients when debugging */
5844 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5845 if (recipients_list)
5847 debug_printf("Recipients:\n");
5848 for (int i = 0; i < recipients_count; i++)
5849 debug_printf(" %s\n", recipients_list[i].address);
5853 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5854 ignored; rejecting here would just add complication, and it can just as
5855 well be done later. Allow $recipients to be visible in the ACL. */
5857 if (acl_not_smtp_start)
5859 uschar *user_msg, *log_msg;
5860 f.enable_dollar_recipients = TRUE;
5861 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5862 &user_msg, &log_msg);
5863 f.enable_dollar_recipients = FALSE;
5866 /* Pause for a while waiting for input. If none received in that time,
5867 close the logfile, if we had one open; then if we wait for a long-running
5868 datasource (months, in one use-case) log rotation will not leave us holding
5871 if (!receive_timeout)
5872 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5875 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5876 will just read the headers for the message, and not write anything onto the
5879 message_ended = END_NOTENDED;
5880 more = receive_msg(extract_recipients);
5882 /* more is always FALSE here (not SMTP message) when reading a message
5883 for real; when reading the headers of a message for filter testing,
5884 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5886 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5887 } /* Non-SMTP message reception */
5889 /* If this is a filter testing run, there are headers in store, but
5890 no message on the spool. Run the filtering code in testing mode, setting
5891 the domain to the qualify domain and the local part to the current user,
5892 unless they have been set by options. The prefix and suffix are left unset
5893 unless specified. The the return path is set to to the sender unless it has
5894 already been set from a return-path header in the message. */
5896 if (filter_test != FTEST_NONE)
5898 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5899 deliver_domain_orig = deliver_domain;
5900 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5901 deliver_localpart_orig = deliver_localpart;
5902 deliver_localpart_prefix = US ftest_prefix;
5903 deliver_localpart_suffix = US ftest_suffix;
5904 deliver_home = originator_home;
5908 printf("Return-path copied from sender\n");
5909 return_path = string_copy(sender_address);
5912 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5913 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5915 receive_add_recipient(
5916 string_sprintf("%s%s%s@%s",
5917 ftest_prefix ? ftest_prefix : US"",
5919 ftest_suffix ? ftest_suffix : US"",
5920 deliver_domain), -1);
5922 printf("Recipient = %s\n", recipients_list[0].address);
5923 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5924 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5926 if (chdir("/")) /* Get away from wherever the user is running this from */
5928 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5929 exim_exit(EXIT_FAILURE);
5932 /* Now we run either a system filter test, or a user filter test, or both.
5933 In the latter case, headers added by the system filter will persist and be
5934 available to the user filter. We need to copy the filter variables
5937 if (filter_test & FTEST_SYSTEM)
5938 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5939 exim_exit(EXIT_FAILURE);
5941 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5943 if (filter_test & FTEST_USER)
5944 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5945 exim_exit(EXIT_FAILURE);
5947 exim_exit(EXIT_SUCCESS);
5950 /* Else act on the result of message reception. We should not get here unless
5951 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5952 will be TRUE. If it is not, check on the number of messages received in this
5955 if ( !session_local_queue_only
5956 && smtp_accept_queue_per_connection > 0
5957 && receive_messagecount > smtp_accept_queue_per_connection)
5959 session_local_queue_only = TRUE;
5960 queue_only_reason = 2;
5963 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5964 and queue_only_load is set, check that the load average is below it. If it is
5965 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5966 default), we put the whole session into queue_only mode. It then remains this
5967 way for any subsequent messages on the same SMTP connection. This is a
5968 deliberate choice; even though the load average may fall, it doesn't seem
5969 right to deliver later messages on the same call when not delivering earlier
5970 ones. However, there are odd cases where this is not wanted, so this can be
5971 changed by setting queue_only_load_latch false. */
5973 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5974 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5976 queue_only_reason = 3;
5977 if (queue_only_load_latch) session_local_queue_only = TRUE;
5980 /* If running as an MUA wrapper, all queueing options and freezing options
5984 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5986 /* Log the queueing here, when it will get a message id attached, but
5987 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5990 if (local_queue_only)
5992 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5993 switch(queue_only_reason)
5996 log_write(L_delay_delivery,
5997 LOG_MAIN, "no immediate delivery: more than %d messages "
5998 "received in one connection", smtp_accept_queue_per_connection);
6002 log_write(L_delay_delivery,
6003 LOG_MAIN, "no immediate delivery: load average %.2f",
6004 (double)load_average/1000.0);
6009 else if (f.queue_only_policy || f.deliver_freeze)
6010 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6012 /* Else do the delivery unless the ACL or local_scan() called for queue only
6013 or froze the message. Always deliver in a separate process. A fork failure is
6014 not a disaster, as the delivery will eventually happen on a subsequent queue
6015 run. The search cache must be tidied before the fork, as the parent will
6016 do it before exiting. The child will trigger a lookup failure and
6017 thereby defer the delivery if it tries to use (for example) a cached ldap
6018 connection that the parent has called unbind on. */
6025 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6028 close_unwanted(); /* Close unwanted file descriptors and TLS */
6029 exim_nullstd(); /* Ensure std{in,out,err} exist */
6031 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6032 mode, deliver_drop_privilege is forced TRUE). */
6034 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6036 delivery_re_exec(CEE_EXEC_EXIT);
6037 /* Control does not return here. */
6040 /* No need to re-exec */
6042 rc = deliver_message(message_id, FALSE, FALSE);
6044 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6045 ? EXIT_SUCCESS : EXIT_FAILURE);
6050 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6051 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6052 "process: %s", strerror(errno));
6056 release_cutthrough_connection(US"msg passed for delivery");
6058 /* In the parent, wait if synchronous delivery is required. This will
6059 always be the case in MUA wrapper mode. */
6061 if (f.synchronous_delivery)
6064 while (wait(&status) != pid);
6065 if ((status & 0x00ff) != 0)
6066 log_write(0, LOG_MAIN|LOG_PANIC,
6067 "process %d crashed with signal %d while delivering %s",
6068 (int)pid, status & 0x00ff, message_id);
6069 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6074 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6075 automatically reaps children (see comments above the loop), clear away any
6076 finished subprocesses here, in case there are lots of messages coming in
6077 from the same source. */
6079 #ifndef SIG_IGN_WORKS
6080 while (waitpid(-1, NULL, WNOHANG) > 0);
6084 return_path = sender_address = NULL;
6085 authenticated_sender = NULL;
6086 deliver_localpart_orig = NULL;
6087 deliver_domain_orig = NULL;
6088 deliver_host = deliver_host_address = NULL;
6089 dnslist_domain = dnslist_matched = NULL;
6090 #ifdef WITH_CONTENT_SCAN
6091 malware_name = NULL;
6094 callout_address = NULL;
6095 sending_ip_address = NULL;
6096 deliver_localpart_data = deliver_domain_data =
6097 recipient_data = sender_data = NULL;
6100 store_reset(reset_point);
6103 exim_exit(EXIT_SUCCESS); /* Never returns */
6104 return 0; /* To stop compiler warning */