1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2023 */
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)
53 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "excessive memory alloc request");
54 return store_malloc((int)size);
58 function_store_free(void * block, void * tag)
60 /* At least some version of pcre2 pass a null pointer */
61 if (block) store_free(block);
66 function_store_get(PCRE2_SIZE size, void * tag)
69 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "excessive memory alloc request");
70 return store_get((int)size, GET_UNTAINTED); /* loses track of taint */
74 function_store_nullfree(void * block, void * tag)
76 /* We cannot free memory allocated using store_get() */
82 /*************************************************
83 * Enums for cmdline interface *
84 *************************************************/
86 enum commandline_info { CMDINFO_NONE=0,
87 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
95 pcre_mlc_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
96 pcre_gen_ctx = pcre2_general_context_create(function_store_get, function_store_nullfree, NULL);
98 pcre_mlc_cmp_ctx = pcre2_compile_context_create(pcre_mlc_ctx);
99 pcre_gen_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
101 pcre_gen_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
107 /*************************************************
108 * Execute regular expression and set strings *
109 *************************************************/
111 /* This function runs a regular expression match, and sets up the pointers to
112 the matched substrings. The matched strings are copied so the lifetime of
113 the subject is not a problem. Matched strings will have the same taint status
114 as the subject string (this is not a de-taint method, and must not be made so
115 given the support for wildcards in REs).
118 re the compiled expression
119 subject the subject string
120 options additional PCRE options
121 setup if < 0 do full setup
122 if >= 0 setup from setup+1 onwards,
123 excluding the full matched string
125 Returns: TRUE if matched, or FALSE
129 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
131 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
132 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
133 PCRE_EOPT | options, md, pcre_gen_mtc_ctx);
136 if ((yield = (res >= 0)))
138 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
139 res = pcre2_get_ovector_count(md);
140 expand_nmax = setup < 0 ? 0 : setup + 1;
141 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
143 /* Although PCRE2 has a pcre2_substring_get_bynumber() conveneience, it
144 seems to return a bad pointer when a capture group had no data, eg. (.*)
145 matching zero letters. So use the underlying ovec and hope (!) that the
146 offsets are sane (including that case). Should we go further and range-
147 check each one vs. the subject string length? */
148 int off = matchnum * 2;
149 int len = ovec[off + 1] - ovec[off];
150 expand_nstring[expand_nmax] = string_copyn(subject + ovec[off], len);
151 expand_nlength[expand_nmax++] = len;
155 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
158 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
159 debug_printf_indent("pcre2: %s\n", errbuf);
161 /* pcre2_match_data_free(md); gen ctx needs no free */
166 /* Check just for match with regex. Uses the common memory-handling.
170 subject string to be checked
171 slen length of subject; -1 for nul-terminated
172 rptr pointer for matched string, copied, or NULL
174 Return: TRUE for a match.
178 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
180 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
181 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
182 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
183 0, PCRE_EOPT, md, pcre_gen_mtc_ctx);
184 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
190 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
193 /* pcre2_match_data_free(md); gen ctx needs no free */
199 /*************************************************
200 * Set up processing details *
201 *************************************************/
203 /* Save a text string for dumping when SIGUSR1 is received.
204 Do checks for overruns.
206 Arguments: format and arguments, as for printf()
211 set_process_info(const char * format, ...)
213 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
219 g = string_fmt_append(&gs, "%5d ", (int)getpid());
220 len = gstring_length(g);
221 va_start(ap, format);
222 if (!string_vformat(g, 0, format, ap))
225 g = string_cat(&gs, US"**** string overflowed buffer ****");
227 g = string_catn(g, US"\n", 1);
228 process_info_len = len_string_from_gstring(g, &s);
229 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
233 /***********************************************
234 * Handler for SIGTERM *
235 ***********************************************/
238 term_handler(int sig)
244 /***********************************************
245 * Handler for SIGSEGV *
246 ***********************************************/
248 #define STACKDUMP_MAX 24
253 void * buf[STACKDUMP_MAX];
255 int nptrs = backtrace(buf, STACKDUMP_MAX);
257 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace");
258 log_write(0, LOG_MAIN|LOG_PANIC, "---");
259 if ((ss = backtrace_symbols(buf, nptrs)))
261 for (int i = 0; i < nptrs; i++)
262 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s", ss[i]);
266 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s", strerror(errno));
267 log_write(0, LOG_MAIN|LOG_PANIC, "---");
275 segv_handler(int sig, siginfo_t * info, void * uctx)
277 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
278 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
279 switch (info->si_code)
281 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
282 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
283 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
284 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
287 if (US info->si_addr < US 4096)
288 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
290 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
291 if (process_info_len > 0)
292 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
294 signal(SIGSEGV, SIG_DFL);
299 segv_handler(int sig)
301 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
302 if (process_info_len > 0)
303 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
305 signal(SIGSEGV, SIG_DFL);
311 /*************************************************
312 * Handler for SIGUSR1 *
313 *************************************************/
315 /* SIGUSR1 causes any exim process to write to the process log details of
316 what it is currently doing. It will only be used if the OS is capable of
317 setting up a handler that causes automatic restarting of any system call
318 that is in progress at the time.
320 This function takes care to be signal-safe.
322 Argument: the signal number (SIGUSR1)
327 usr1_handler(int sig)
331 os_restarting_signal(sig, usr1_handler);
333 if (!process_log_path) return;
334 fd = log_open_as_exim(process_log_path);
336 /* If we are neither exim nor root, or if we failed to create the log file,
337 give up. There is not much useful we can do with errors, since we don't want
338 to disrupt whatever is going on outside the signal handler. */
342 (void)write(fd, process_info, process_info_len);
348 /*************************************************
350 *************************************************/
352 /* This handler is enabled most of the time that Exim is running. The handler
353 doesn't actually get used unless alarm() has been called to set a timer, to
354 place a time limit on a system call of some kind. When the handler is run, it
357 There are some other SIGALRM handlers that are used in special cases when more
358 than just a flag setting is required; for example, when reading a message's
359 input. These are normally set up in the code module that uses them, and the
360 SIGALRM handler is reset to this one afterwards.
362 Argument: the signal value (SIGALRM)
367 sigalrm_handler(int sig)
370 os_non_restarting_signal(SIGALRM, sigalrm_handler);
375 /*************************************************
376 * Sleep for a fractional time interval *
377 *************************************************/
379 /* This function is called by millisleep() and exim_wait_tick() to wait for a
380 period of time that may include a fraction of a second. The coding is somewhat
381 tedious. We do not expect setitimer() ever to fail, but if it does, the process
382 will wait for ever, so we panic in this instance. (There was a case of this
383 when a bug in a function that calls milliwait() caused it to pass invalid data.
384 That's when I added the check. :-)
386 We assume it to be not worth sleeping for under 50us; this value will
387 require revisiting as hardware advances. This avoids the issue of
388 a zero-valued timer setting meaning "never fire".
390 Argument: an itimerval structure containing the interval
395 milliwait(struct itimerval *itval)
398 sigset_t old_sigmask;
399 int save_errno = errno;
401 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
403 (void)sigemptyset(&sigmask); /* Empty mask */
404 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
405 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
406 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
407 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
408 "setitimer() failed: %s", strerror(errno));
409 (void)sigfillset(&sigmask); /* All signals */
410 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
411 (void)sigsuspend(&sigmask); /* Until SIGALRM */
412 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
414 sigalrm_seen = FALSE;
420 /*************************************************
421 * Millisecond sleep function *
422 *************************************************/
424 /* The basic sleep() function has a granularity of 1 second, which is too rough
425 in some cases - for example, when using an increasing delay to slow down
428 Argument: number of millseconds
435 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
436 .it_value = {.tv_sec = msec/1000,
437 .tv_usec = (msec % 1000) * 1000}};
443 /*************************************************
444 * Compare microsecond times *
445 *************************************************/
452 Returns: -1, 0, or +1
456 exim_tvcmp(struct timeval *t1, struct timeval *t2)
458 if (t1->tv_sec > t2->tv_sec) return +1;
459 if (t1->tv_sec < t2->tv_sec) return -1;
460 if (t1->tv_usec > t2->tv_usec) return +1;
461 if (t1->tv_usec < t2->tv_usec) return -1;
468 /*************************************************
469 * Clock tick wait function *
470 *************************************************/
472 #ifdef _POSIX_MONOTONIC_CLOCK
473 # ifdef CLOCK_BOOTTIME
474 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
476 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
479 /* Amount EXIM_CLOCK is behind realtime, at startup. */
480 static struct timespec offset_ts;
483 exim_clock_init(void)
486 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
487 (void)gettimeofday(&tv, NULL);
488 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
489 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
490 if (offset_ts.tv_nsec >= 0) return;
492 offset_ts.tv_nsec += 1000*1000*1000;
498 exim_gettime(struct timeval * tv)
500 #ifdef _POSIX_MONOTONIC_CLOCK
501 struct timespec now_ts;
503 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
505 now_ts.tv_sec += offset_ts.tv_sec;
506 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
509 now_ts.tv_nsec -= 1000*1000*1000;
511 tv->tv_sec = now_ts.tv_sec;
512 tv->tv_usec = now_ts.tv_nsec / 1000;
516 (void)gettimeofday(tv, NULL);
520 /* Exim uses a time + a pid to generate a unique identifier in two places: its
521 message IDs, and in file names for maildir deliveries. Because some OS now
522 re-use pids within the same second, sub-second times are now being used.
523 However, for absolute certainty, we must ensure the clock has ticked before
524 allowing the relevant process to complete. At the time of implementation of
525 this code (February 2003), the speed of processors is such that the clock will
526 invariably have ticked already by the time a process has done its job. This
527 function prepares for the time when things are faster - and it also copes with
528 clocks that go backwards.
531 prev_tv A timeval which was used to create uniqueness; its usec field
532 has been rounded down to the value of the resolution.
533 We want to be sure the current time is greater than this.
534 On return, updated to current (rounded down).
535 resolution The resolution that was used to divide the microseconds
536 (1 for maildir, larger for message ids)
542 exim_wait_tick(struct timeval * prev_tv, int resolution)
544 struct timeval now_tv;
545 long int now_true_usec;
547 exim_gettime(&now_tv);
548 now_true_usec = now_tv.tv_usec;
549 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
551 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
553 struct itimerval itval;
554 itval.it_interval.tv_sec = 0;
555 itval.it_interval.tv_usec = 0;
556 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
557 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
559 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
560 negative value for the microseconds is possible only in the case when "now"
561 is more than a second less than "tgt". That means that itval.it_value.tv_sec
562 is greater than zero. The following correction is therefore safe. */
564 if (itval.it_value.tv_usec < 0)
566 itval.it_value.tv_usec += 1000000;
567 itval.it_value.tv_sec -= 1;
570 DEBUG(D_transport|D_receive)
572 if (!f.running_in_test_harness)
574 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
575 prev_tv->tv_sec, (long) prev_tv->tv_usec,
576 now_tv.tv_sec, (long) now_tv.tv_usec);
577 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
578 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
584 /* Be prapared to go around if the kernel does not implement subtick
585 granularity (GNU Hurd) */
587 exim_gettime(&now_tv);
588 now_true_usec = now_tv.tv_usec;
589 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
597 /*************************************************
598 * Call fopen() with umask 777 and adjust mode *
599 *************************************************/
601 /* Exim runs with umask(0) so that files created with open() have the mode that
602 is specified in the open() call. However, there are some files, typically in
603 the spool directory, that are created with fopen(). They end up world-writeable
604 if no precautions are taken. Although the spool directory is not accessible to
605 the world, this is an untidiness. So this is a wrapper function for fopen()
606 that sorts out the mode of the created file.
609 filename the file name
610 options the fopen() options
611 mode the required mode
613 Returns: the fopened FILE or NULL
617 modefopen(const uschar *filename, const char *options, mode_t mode)
619 mode_t saved_umask = umask(0777);
620 FILE *f = Ufopen(filename, options);
621 (void)umask(saved_umask);
622 if (f != NULL) (void)fchmod(fileno(f), mode);
627 /*************************************************
628 * Ensure stdin, stdout, and stderr exist *
629 *************************************************/
631 /* Some operating systems grumble if an exec() happens without a standard
632 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
633 file will be opened and will use these fd values, and then some other bit of
634 code will assume, for example, that it can write error messages to stderr.
635 This function ensures that fds 0, 1, and 2 are open if they do not already
636 exist, by connecting them to /dev/null.
638 This function is also used to ensure that std{in,out,err} exist at all times,
639 so that if any library that Exim calls tries to use them, it doesn't crash.
650 for (int i = 0; i <= 2; i++)
652 if (fstat(i, &statbuf) < 0 && errno == EBADF)
654 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
655 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
656 string_open_failed("/dev/null", NULL));
657 if (devnull != i) (void)dup2(devnull, i);
660 if (devnull > 2) (void)close(devnull);
666 /*************************************************
667 * Close unwanted file descriptors for delivery *
668 *************************************************/
670 /* This function is called from a new process that has been forked to deliver
671 an incoming message, either directly, or using exec.
673 We want any smtp input streams to be closed in this new process. However, it
674 has been observed that using fclose() here causes trouble. When reading in -bS
675 input, duplicate copies of messages have been seen. The files will be sharing a
676 file pointer with the parent process, and it seems that fclose() (at least on
677 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
678 least sometimes. Hence we go for closing the underlying file descriptors.
680 If TLS is active, we want to shut down the TLS library, but without molesting
681 the parent's SSL connection.
683 For delivery of a non-SMTP message, we want to close stdin and stdout (and
684 stderr unless debugging) because the calling process might have set them up as
685 pipes and be waiting for them to close before it waits for the submission
686 process to terminate. If they aren't closed, they hold up the calling process
687 until the initial delivery process finishes, which is not what we want.
689 Exception: We do want it for synchronous delivery!
691 And notwithstanding all the above, if D_resolver is set, implying resolver
692 debugging, leave stdout open, because that's where the resolver writes its
695 When we close stderr (which implies we've also closed stdout), we also get rid
696 of any controlling terminal.
708 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
710 (void)close(fileno(smtp_in));
711 (void)close(fileno(smtp_out));
716 (void)close(0); /* stdin */
717 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
718 if (debug_selector == 0) /* stderr */
720 if (!f.synchronous_delivery)
733 /*************************************************
735 *************************************************/
737 /* This function sets a new uid and gid permanently, optionally calling
738 initgroups() to set auxiliary groups. There are some special cases when running
739 Exim in unprivileged modes. In these situations the effective uid will not be
740 root; if we already have the right effective uid/gid, and don't need to
741 initialize any groups, leave things as they are.
746 igflag TRUE if initgroups() wanted
747 msg text to use in debugging output and failure log
749 Returns: nothing; bombs out on failure
753 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
755 uid_t euid = geteuid();
756 gid_t egid = getegid();
758 if (euid == root_uid || euid != uid || egid != gid || igflag)
760 /* At least one OS returns +1 for initgroups failure, so just check for
765 struct passwd *pw = getpwuid(uid);
767 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
768 "no passwd entry for uid=%ld", (long int)uid);
770 if (initgroups(pw->pw_name, gid) != 0)
771 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
772 (long int)uid, strerror(errno));
775 if (setgid(gid) < 0 || setuid(uid) < 0)
776 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
777 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
780 /* Debugging output included uid/gid and all groups */
784 int group_count, save_errno;
785 gid_t group_list[EXIM_GROUPLIST_SIZE];
786 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
787 (long int)geteuid(), (long int)getegid(), (long int)getpid());
788 group_count = getgroups(nelem(group_list), group_list);
790 debug_printf(" auxiliary group list:");
792 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
793 else if (group_count < 0)
794 debug_printf(" <error: %s>", strerror(save_errno));
795 else debug_printf(" <none>");
803 /*************************************************
805 *************************************************/
807 /* Exim exits via this function so that it always clears up any open
813 Returns: does not return
822 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
823 ">>>>>>>>>>>>>>>>\n",
824 (int)getpid(), process_purpose, rc);
830 exim_underbar_exit(int rc)
834 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
835 ">>>>>>>>>>>>>>>>\n",
836 (int)getpid(), process_purpose, rc);
842 /* Print error string, then die */
844 exim_fail(const char * fmt, ...)
848 vfprintf(stderr, fmt, ap);
853 /* fail if a length is too long */
855 exim_len_fail_toolong(int itemlen, int maxlen, const char * description)
857 if (itemlen <= maxlen)
859 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
860 itemlen, maxlen, description);
864 /* only pass through the string item back to the caller if it's short enough */
865 static inline const uschar *
866 exim_str_fail_toolong(const uschar * item, int maxlen, const char * description)
869 exim_fail("exim: bad item for: %s\n", description);
870 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
874 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
875 of chown()/fchown(). See src/functions.h for more explanation */
877 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
879 int saved_errno = errno; /* from the preceeding chown call */
881 log_write(0, LOG_MAIN|LOG_PANIC,
882 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
883 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
884 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
886 /* I leave this here, commented, in case the "bug"(?) comes up again.
887 It is not an Exim bug, but we can provide a workaround.
893 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
895 if (buf.st_uid == owner && buf.st_gid == group) return 0;
896 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
898 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
906 /* Bump the index for argv, checking for overflow,
907 and return the argument. */
909 static const uschar *
910 next_argv(const uschar ** argv, int * pi, int argc, const uschar * where)
913 if (++i >= argc) exim_fail("exim: bad item for: %s\n", where);
914 return argv[*pi = i];
918 /*************************************************
919 * Extract port from host address *
920 *************************************************/
922 /* Called to extract the port from the values given to -oMa and -oMi.
923 It also checks the syntax of the address, and terminates it before the
924 port data when a port is extracted.
927 address the address, with possible port on the end
929 Returns: the port, or zero if there isn't one
930 bombs out on a syntax error
934 check_port(uschar *address)
936 int port = host_address_extract_port(address);
937 if (string_is_ip_address(address, NULL) == 0)
938 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
944 /*************************************************
945 * Test/verify an address *
946 *************************************************/
948 /* This function is called by the -bv and -bt code. It extracts a working
949 address from a full RFC 822 address. This isn't really necessary per se, but it
950 has the effect of collapsing source routes.
954 flags flag bits for verify_address()
955 exit_value to be set for failures
961 test_address(uschar *s, int flags, int *exit_value)
963 int start, end, domain;
964 uschar *parse_error = NULL;
965 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
969 fprintf(stdout, "syntax error: %s\n", parse_error);
974 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
975 -1, -1, NULL, NULL, NULL);
976 if (rc == FAIL) *exit_value = 2;
977 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
983 /*************************************************
984 * Show supported features *
985 *************************************************/
988 show_string(BOOL is_stdout, gstring * g)
990 const uschar * s = string_from_gstring(g);
992 if (is_stdout) fputs(CCS s, stdout);
993 else debug_printf("%s", s);
998 show_db_version(gstring * g)
1000 #ifdef DB_VERSION_STRING
1003 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
1004 g = string_fmt_append(g, " Runtime: %s\n",
1005 db_version(NULL, NULL, NULL));
1008 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
1010 #elif defined(BTREEVERSION) && defined(HASHVERSION)
1012 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
1014 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
1017 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
1018 g = string_cat(g, US"Probably ndbm\n");
1019 #elif defined(USE_TDB)
1020 g = string_cat(g, US"Using tdb\n");
1023 g = string_cat(g, US"Probably GDBM (native mode)\n");
1025 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1032 /* This function is called for -bV/--version and for -d to output the optional
1033 features of the current Exim binary.
1035 Arguments: BOOL, true for stdout else debug channel
1040 show_whats_supported(BOOL is_stdout)
1042 rmark reset_point = store_mark();
1045 DEBUG(D_any) {} else g = show_db_version(g);
1047 g = string_cat(g, US"Support for:");
1048 #ifdef WITH_CONTENT_SCAN
1049 g = string_cat(g, US" Content_Scanning");
1051 #ifdef SUPPORT_CRYPTEQ
1052 g = string_cat(g, US" crypteq");
1054 #ifdef EXPAND_DLFUNC
1055 g = string_cat(g, US" Expand_dlfunc");
1058 g = string_cat(g, US" iconv()");
1061 g = string_cat(g, US" IPv6");
1064 g = string_cat(g, US" PAM");
1067 g = string_cat(g, US" Perl");
1070 g = string_cat(g, US" GnuTLS");
1072 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1073 g = string_cat(g, US" move_frozen_messages");
1076 g = string_cat(g, US" OpenSSL");
1078 #if defined(CYRUS_PWCHECK_SOCKET)
1079 g = string_cat(g, US" pwcheck");
1081 #if defined(RADIUS_CONFIG_FILE)
1082 g = string_cat(g, US" radius");
1084 #ifndef DISABLE_TLS_RESUME
1085 g = string_cat(g, US" TLS_resume");
1087 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1088 g = string_cat(g, US" translate_ip_address");
1090 #ifdef USE_TCP_WRAPPERS
1091 g = string_cat(g, US" TCPwrappers");
1093 #ifdef HAVE_SETCLASSRESOURCES
1094 g = string_cat(g, US" use_setclassresources");
1097 g = string_cat(g, US" DANE");
1099 #ifndef DISABLE_DKIM
1100 g = string_cat(g, US" DKIM");
1102 #ifdef SUPPORT_DMARC
1103 g = string_cat(g, US" DMARC");
1105 #ifndef DISABLE_DNSSEC
1106 g = string_cat(g, US" DNSSEC");
1108 #ifndef DISABLE_ESMTP_LIMITS
1109 g = string_cat(g, US" ESMTP_Limits");
1111 #ifndef DISABLE_EVENT
1112 g = string_cat(g, US" Event");
1115 g = string_cat(g, US" I18N");
1117 #ifndef DISABLE_OCSP
1118 g = string_cat(g, US" OCSP");
1120 #ifndef DISABLE_PIPE_CONNECT
1121 g = string_cat(g, US" PIPECONNECT");
1123 #ifndef DISABLE_PRDR
1124 g = string_cat(g, US" PRDR");
1126 #ifdef SUPPORT_PROXY
1127 g = string_cat(g, US" PROXY");
1129 #ifndef DISABLE_QUEUE_RAMP
1130 g = string_cat(g, US" Queue_Ramp");
1132 #ifdef SUPPORT_SOCKS
1133 g = string_cat(g, US" SOCKS");
1136 g = string_cat(g, US" SPF");
1138 #if defined(SUPPORT_SRS)
1139 g = string_cat(g, US" SRS");
1143 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1145 #ifdef EXPERIMENTAL_ARC
1146 g = string_cat(g, US" Experimental_ARC");
1148 #ifdef EXPERIMENTAL_BRIGHTMAIL
1149 g = string_cat(g, US" Experimental_Brightmail");
1151 #ifdef EXPERIMENTAL_DCC
1152 g = string_cat(g, US" Experimental_DCC");
1154 #ifdef EXPERIMENTAL_DSN_INFO
1155 g = string_cat(g, US" Experimental_DSN_info");
1157 #ifdef EXPERIMENTAL_QUEUEFILE
1158 g = string_cat(g, US" Experimental_QUEUEFILE");
1160 #ifdef EXPERIMENTAL_XCLIENT
1161 g = string_cat(g, US" Experimental_XCLIENT");
1163 g = string_cat(g, US"\n");
1165 g = string_cat(g, US"Lookups (built-in):");
1166 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1167 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1169 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1170 g = string_cat(g, US" cdb");
1172 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1173 g = string_cat(g, US" dbm dbmjz dbmnz");
1175 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1176 g = string_cat(g, US" dnsdb");
1178 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1179 g = string_cat(g, US" dsearch");
1181 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1182 g = string_cat(g, US" ibase");
1184 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1185 g = string_cat(g, US" json");
1187 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1188 g = string_cat(g, US" ldap ldapdn ldapm");
1191 g = string_cat(g, US" lmdb");
1193 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1194 g = string_cat(g, US" mysql");
1196 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1197 g = string_cat(g, US" nis nis0");
1199 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1200 g = string_cat(g, US" nisplus");
1202 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1203 g = string_cat(g, US" oracle");
1205 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1206 g = string_cat(g, US" passwd");
1208 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1209 g = string_cat(g, US" pgsql");
1211 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1212 g = string_cat(g, US" redis");
1214 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1215 g = string_cat(g, US" sqlite");
1217 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1218 g = string_cat(g, US" testdb");
1220 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1221 g = string_cat(g, US" whoson");
1223 g = string_cat(g, US"\n");
1225 g = auth_show_supported(g);
1226 g = route_show_supported(g);
1227 g = transport_show_supported(g);
1229 #ifdef WITH_CONTENT_SCAN
1230 g = malware_show_supported(g);
1232 show_string(is_stdout, g); g = NULL;
1234 if (fixed_never_users[0] > 0)
1237 g = string_cat(g, US"Fixed never_users: ");
1238 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1239 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1240 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1243 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1245 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1247 /* Everything else is details which are only worth reporting when debugging.
1248 Perhaps the tls_version_report should move into this too. */
1252 /* clang defines __GNUC__ (at least, for me) so test for it first */
1253 #if defined(__clang__)
1254 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1255 #elif defined(__GNUC__)
1257 g = string_fmt_append(g, "Compiler: GCC [%s]\n", __VERSION__);
1259 g = string_fmt_append(g, "Compiler: GCC [%s]\n", "? unknown version ?";
1262 g = string_cat(g, US"Compiler: <unknown>\n");
1265 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1266 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1267 __GLIBC__, __GLIBC_MINOR__);
1268 if (__GLIBC_PREREQ(2, 1))
1269 g = string_fmt_append(g, " Runtime: %s\n",
1270 gnu_get_libc_version());
1273 g = show_db_version(g);
1276 g = tls_version_report(g);
1279 g = utf8_version_report(g);
1281 #ifdef SUPPORT_DMARC
1282 g = dmarc_version_report(g);
1285 g = spf_lib_version_report(g);
1288 show_string(is_stdout, g);
1291 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1292 if (authi->version_report)
1293 g = (*authi->version_report)(g);
1295 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1296 characters; unless it's an ancient version of PCRE in which case it
1298 #ifndef PCRE_PRERELEASE
1299 # define PCRE_PRERELEASE
1302 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1305 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1306 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1308 PCRE2_MAJOR, PCRE2_MINOR,
1309 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1313 #undef EXPAND_AND_QUOTE
1315 show_string(is_stdout, g);
1319 for (int i = 0; i < lookup_list_count; i++)
1320 if (lookup_list[i]->version_report)
1321 g = lookup_list[i]->version_report(g);
1322 show_string(is_stdout, g);
1325 #ifdef WHITELIST_D_MACROS
1326 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1328 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1330 #ifdef TRUSTED_CONFIG_LIST
1331 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1333 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1337 show_string(is_stdout, g);
1338 store_reset(reset_point);
1342 /*************************************************
1343 * Show auxiliary information about Exim *
1344 *************************************************/
1347 show_exim_information(enum commandline_info request, FILE *stream)
1352 fprintf(stream, "Oops, something went wrong.\n");
1356 "The -bI: flag takes a string indicating which information to provide.\n"
1357 "If the string is not recognised, you'll get this help (on stderr).\n"
1359 " exim -bI:help this information\n"
1360 " exim -bI:dscp list of known dscp value keywords\n"
1361 " exim -bI:sieve list of supported sieve extensions\n"
1365 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1366 fprintf(stream, "%s\n", *pp);
1369 dscp_list_to_stream(stream);
1375 /*************************************************
1376 * Quote a local part *
1377 *************************************************/
1379 /* This function is used when a sender address or a From: or Sender: header
1380 line is being created from the caller's login, or from an authenticated_id. It
1381 applies appropriate quoting rules for a local part.
1383 Argument: the local part
1384 Returns: the local part, quoted if necessary
1388 local_part_quote(const uschar * lpart)
1390 BOOL needs_quote = FALSE;
1393 for (const uschar * t = lpart; !needs_quote && *t; t++)
1394 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1395 (*t != '.' || t == lpart || t[1] == 0);
1397 if (!needs_quote) return lpart;
1399 g = string_catn(NULL, US"\"", 1);
1403 uschar * nq = US Ustrpbrk(lpart, "\\\"");
1406 g = string_cat(g, lpart);
1409 g = string_catn(g, lpart, nq - lpart);
1410 g = string_catn(g, US"\\", 1);
1411 g = string_catn(g, nq, 1);
1415 g = string_catn(g, US"\"", 1);
1416 return string_from_gstring(g);
1422 /*************************************************
1423 * Load readline() functions *
1424 *************************************************/
1426 /* This function is called from testing executions that read data from stdin,
1427 but only when running as the calling user. Currently, only -be does this. The
1428 function loads the readline() function library and passes back the functions.
1429 On some systems, it needs the curses library, so load that too, but try without
1430 it if loading fails. All this functionality has to be requested at build time.
1433 fn_readline_ptr pointer to where to put the readline pointer
1434 fn_addhist_ptr pointer to where to put the addhistory function
1436 Returns: the dlopen handle or NULL on failure
1440 set_readline(char * (**fn_readline_ptr)(const char *),
1441 void (**fn_addhist_ptr)(const char *))
1444 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1446 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1447 if (dlhandle_curses) dlclose(dlhandle_curses);
1451 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1452 * char * readline (const char *prompt);
1453 * void add_history (const char *string);
1455 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1456 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1459 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1467 /*************************************************
1468 * Get a line from stdin for testing things *
1469 *************************************************/
1471 /* This function is called when running tests that can take a number of lines
1472 of input (for example, -be and -bt). It handles continuations and trailing
1473 spaces. And prompting and a blank line output on eof. If readline() is in use,
1474 the arguments are non-NULL and provide the relevant functions.
1477 fn_readline readline function or NULL
1478 fn_addhist addhist function or NULL
1480 Returns: pointer to dynamic memory, or NULL at end of file
1484 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1487 BOOL had_input = FALSE;
1489 if (!fn_readline) { printf("> "); fflush(stdout); }
1491 for (int i = 0;; i++)
1493 uschar buffer[1024];
1497 char *readline_line = NULL;
1500 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1501 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1502 p = US readline_line;
1507 /* readline() not in use */
1510 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1514 /* Handle the line */
1517 ss = p + Ustrlen(p);
1518 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1521 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1523 g = string_catn(g, p, ss - p);
1526 if (fn_readline) free(readline_line);
1529 /* g can only be NULL if ss==p */
1530 if (ss == p || gstring_last_char(g) != '\\') /* not continuation; done */
1533 gstring_trim(g, 1); /* drop the \ */
1536 if (had_input) return g ? string_from_gstring(g) : US"";
1543 /*************************************************
1544 * Output usage information for the program *
1545 *************************************************/
1547 /* This function is called when there are no recipients
1548 or a specific --help argument was added.
1551 progname information on what name we were called by
1553 Returns: DOES NOT RETURN
1557 exim_usage(const uschar * progname)
1560 /* Handle specific program invocation variants */
1561 if (Ustrcmp(progname, US"-mailq") == 0)
1563 "mailq - list the contents of the mail queue\n\n"
1564 "For a list of options, see the Exim documentation.\n");
1566 /* Generic usage - we output this whatever happens */
1568 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1569 "not directly from a shell command line. Options and/or arguments control\n"
1570 "what it does when called. For a list of options, see the Exim documentation.\n");
1575 /*************************************************
1576 * Validate that the macros given are okay *
1577 *************************************************/
1579 /* Typically, Exim will drop privileges if macros are supplied. In some
1580 cases, we want to not do so.
1582 Arguments: opt_D_used - true if the commandline had a "-D" option
1583 Returns: true if trusted, false otherwise
1587 macros_trusted(BOOL opt_D_used)
1589 #ifdef WHITELIST_D_MACROS
1590 uschar *whitelisted, *end, *p, **whites;
1591 int white_count, i, n;
1593 BOOL prev_char_item, found;
1598 #ifndef WHITELIST_D_MACROS
1602 /* We only trust -D overrides for some invoking users:
1603 root, the exim run-time user, the optional config owner user.
1604 I don't know why config-owner would be needed, but since they can own the
1605 config files anyway, there's no security risk to letting them override -D. */
1606 if ( ! ((real_uid == root_uid)
1607 || (real_uid == exim_uid)
1608 #ifdef CONFIGURE_OWNER
1609 || (real_uid == config_uid)
1613 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1617 /* Get a list of macros which are whitelisted */
1618 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1619 prev_char_item = FALSE;
1621 for (p = whitelisted; *p != '\0'; ++p)
1623 if (*p == ':' || isspace(*p))
1628 prev_char_item = FALSE;
1631 if (!prev_char_item)
1632 prev_char_item = TRUE;
1639 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1640 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1645 if (i == white_count)
1647 while (*p != '\0' && p < end)
1653 /* The list of commandline macros should be very short.
1654 Accept the N*M complexity. */
1655 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1658 for (uschar ** w = whites; *w; ++w)
1659 if (Ustrcmp(*w, m->name) == 0)
1666 if (!m->replacement)
1668 if ((len = m->replen) == 0)
1670 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1673 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1679 /*************************************************
1680 * Expansion testing *
1681 *************************************************/
1683 /* Expand and print one item, doing macro-processing.
1686 item line for expansion
1690 expansion_test_line(const uschar * line)
1696 Ustrncpy(big_buffer, line, big_buffer_size);
1697 big_buffer[big_buffer_size-1] = '\0';
1698 len = Ustrlen(big_buffer);
1700 (void) macros_expand(0, &len, &dummy_macexp);
1702 if (isupper(big_buffer[0]))
1704 if (macro_read_assignment(big_buffer))
1705 printf("Defined macro '%s'\n", mlast->name);
1707 else if (Ustrncmp(big_buffer, "set,t ", 6) == 0)
1708 printf("%s\n", acl_standalone_setvar(big_buffer+6, TRUE));
1709 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1710 printf("%s\n", acl_standalone_setvar(big_buffer+4, FALSE));
1712 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1713 else printf("Failed: %s\n", expand_string_message);
1718 /*************************************************
1719 * Queue-runner operations *
1720 *************************************************/
1722 /* Prefix a new qrunner descriptor to the qrunners list */
1727 qrunner * q = qrunners;
1728 qrunners = store_get(sizeof(qrunner), GET_UNTAINTED);
1729 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1731 qrunners->next_tick = time(NULL); /* run right away */
1736 alloc_onetime_qrunner(void)
1738 qrunners = store_get_perm(sizeof(qrunner), GET_UNTAINTED);
1739 memset(qrunners, 0, sizeof(qrunner)); /* default queue, zero interval */
1740 qrunners->next_tick = time(NULL); /* run right away */
1741 qrunners->run_max = 1;
1746 /*************************************************
1747 * Entry point and high-level code *
1748 *************************************************/
1750 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1751 the appropriate action. All the necessary functions are present in the one
1752 binary. I originally thought one should split it up, but it turns out that so
1753 much of the apparatus is needed in each chunk that one might as well just have
1754 it all available all the time, which then makes the coding easier as well.
1757 argc count of entries in argv
1758 argv argument strings, with argv[0] being the program name
1760 Returns: EXIT_SUCCESS if terminated successfully
1761 EXIT_FAILURE otherwise, except when a message has been sent
1762 to the sender, and -oee was given
1766 main(int argc, char ** cargv)
1768 const uschar ** argv = CUSS cargv;
1769 int arg_receive_timeout = -1;
1770 int arg_smtp_receive_timeout = -1;
1771 int arg_error_handling = error_handling;
1772 int filter_sfd = -1;
1773 int filter_ufd = -1;
1776 int list_queue_option = QL_BASIC;
1778 int msg_action_arg = -1;
1779 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1780 int queue_only_reason = 0;
1782 int perl_start_option = 0;
1784 int recipients_arg = argc;
1785 int sender_address_domain = 0;
1786 int test_retry_arg = -1;
1787 int test_rewrite_arg = -1;
1788 gid_t original_egid;
1789 BOOL arg_queue_only = FALSE;
1790 BOOL bi_option = FALSE;
1791 BOOL checking = FALSE;
1792 BOOL count_queue = FALSE;
1793 BOOL expansion_test = FALSE;
1794 BOOL extract_recipients = FALSE;
1795 BOOL flag_G = FALSE;
1796 BOOL flag_n = FALSE;
1797 BOOL forced_delivery = FALSE;
1798 BOOL f_end_dot = FALSE;
1799 BOOL deliver_give_up = FALSE;
1800 BOOL list_queue = FALSE;
1801 BOOL list_options = FALSE;
1802 BOOL list_config = FALSE;
1803 BOOL local_queue_only;
1804 BOOL one_msg_action = FALSE;
1805 BOOL opt_D_used = FALSE;
1806 BOOL queue_only_set = FALSE;
1807 BOOL receiving_message = TRUE;
1808 BOOL sender_ident_set = FALSE;
1809 BOOL session_local_queue_only;
1811 BOOL removed_privilege = FALSE;
1812 BOOL usage_wanted = FALSE;
1813 BOOL verify_address_mode = FALSE;
1814 BOOL verify_as_sender = FALSE;
1815 BOOL rcpt_verify_quota = FALSE;
1816 BOOL version_printed = FALSE;
1817 const uschar * alias_arg = NULL;
1818 const uschar * called_as = US"";
1819 const uschar * cmdline_syslog_name = NULL;
1820 const uschar * start_queue_run_id = NULL;
1821 const uschar * stop_queue_run_id = NULL;
1822 const uschar * expansion_test_message = NULL;
1823 const uschar * ftest_domain = NULL;
1824 const uschar * ftest_localpart = NULL;
1825 const uschar * ftest_prefix = NULL;
1826 const uschar * ftest_suffix = NULL;
1827 uschar * log_oneline = NULL;
1828 const uschar * malware_test_file = NULL;
1829 const uschar * real_sender_address;
1830 uschar * originator_home = US"/";
1834 struct stat statbuf;
1835 pid_t passed_qr_pid = (pid_t)0;
1836 int passed_qr_pipe = -1;
1837 gid_t group_list[EXIM_GROUPLIST_SIZE];
1839 /* For the -bI: flag */
1840 enum commandline_info info_flag = CMDINFO_NONE;
1841 BOOL info_stdout = FALSE;
1843 /* Possible options for -R and -S */
1845 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1847 /* Need to define this in case we need to change the environment in order
1848 to get rid of a bogus time zone. We have to make it char rather than uschar
1849 because some OS define it in /usr/include/unistd.h. */
1851 extern char **environ;
1853 #ifdef MEASURE_TIMING
1854 (void)gettimeofday(×tamp_startup, NULL);
1857 store_init(); /* Initialise the memory allocation susbsystem */
1858 pcre_init(); /* Set up memory handling for pcre */
1860 /* If the Exim user and/or group and/or the configuration file owner/group were
1861 defined by ref:name at build time, we must now find the actual uid/gid values.
1862 This is a feature to make the lives of binary distributors easier. */
1864 #ifdef EXIM_USERNAME
1865 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1868 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1870 /* If ref:name uses a number as the name, route_finduser() returns
1871 TRUE with exim_uid set and pw coerced to NULL. */
1873 exim_gid = pw->pw_gid;
1874 #ifndef EXIM_GROUPNAME
1877 "exim: ref:name should specify a usercode, not a group.\n"
1878 "exim: can't let you get away with it unless you also specify a group.\n");
1882 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1885 #ifdef EXIM_GROUPNAME
1886 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1887 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1890 #ifdef CONFIGURE_OWNERNAME
1891 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1892 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1893 CONFIGURE_OWNERNAME);
1896 /* We default the system_filter_user to be the Exim run-time user, as a
1897 sane non-root value. */
1898 system_filter_uid = exim_uid;
1900 #ifdef CONFIGURE_GROUPNAME
1901 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1902 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1903 CONFIGURE_GROUPNAME);
1906 /* In the Cygwin environment, some initialization used to need doing.
1907 It was fudged in by means of this macro; now no longer but we'll leave
1908 it in case of others. */
1914 /* Check a field which is patched when we are running Exim within its
1915 testing harness; do a fast initial check, and then the whole thing. */
1917 f.running_in_test_harness =
1918 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1919 if (f.running_in_test_harness)
1922 /* Protect against abusive argv[0] */
1923 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1924 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1926 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1927 at the start of a program; however, it seems that some environments do not
1928 follow this. A "strange" locale can affect the formatting of timestamps, so we
1931 setlocale(LC_ALL, "C");
1933 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1935 #ifdef _POSIX_MONOTONIC_CLOCK
1939 /* Set up the default handler for timing using alarm(). */
1941 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1943 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1944 because store_malloc writes a log entry on failure. */
1946 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1947 exim_fail("exim: failed to get store for log buffer\n");
1949 /* Initialize the default log options. */
1951 bits_set(log_selector, log_selector_size, log_default);
1953 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1954 NULL when the daemon is run and the file is closed. We have to use this
1955 indirection, because some systems don't allow writing to the variable "stderr".
1958 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1960 /* Ensure there is a big buffer for temporary use in several places. It is put
1961 in malloc store so that it can be freed for enlargement if necessary. */
1963 big_buffer = store_malloc(big_buffer_size);
1965 /* Set up the handler for the data request signal, and set the initial
1966 descriptive text. */
1968 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1969 set_process_info("initializing");
1970 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1973 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1974 sigaction(SIGSEGV, &act, NULL);
1977 signal(SIGSEGV, segv_handler); /* log faults */
1980 /* If running in a dockerized environment, the TERM signal is only
1981 delegated to the PID 1 if we request it by setting an signal handler */
1983 if (getpid() == 1) signal(SIGTERM, term_handler);
1985 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1986 in the daemon code. For the rest of Exim's uses, we ignore it. */
1988 signal(SIGHUP, SIG_IGN);
1990 /* We don't want to die on pipe errors as the code is written to handle
1991 the write error instead. */
1993 signal(SIGPIPE, SIG_IGN);
1995 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1996 set to SIG_IGN. This causes subprocesses that complete before the parent
1997 process waits for them not to hang around, so when Exim calls wait(), nothing
1998 is there. The wait() code has been made robust against this, but let's ensure
1999 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
2000 ending status. We use sigaction rather than plain signal() on those OS where
2001 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
2002 problem on AIX with this.) */
2006 struct sigaction act;
2007 act.sa_handler = SIG_DFL;
2008 sigemptyset(&(act.sa_mask));
2010 sigaction(SIGCHLD, &act, NULL);
2013 signal(SIGCHLD, SIG_DFL);
2016 /* Save the arguments for use if we re-exec exim as a daemon after receiving
2021 /* Set up the version number. Set up the leading 'E' for the external form of
2022 message ids, set the pointer to the internal form, and initialize it to
2023 indicate no message being processed. */
2026 message_id_option[0] = '-';
2027 message_id_external = message_id_option + 1;
2028 message_id_external[0] = 'E';
2029 message_id = message_id_external + 1;
2032 /* Set the umask to zero so that any files Exim creates using open() are
2033 created with the modes that it specifies. NOTE: Files created with fopen() have
2034 a problem, which was not recognized till rather late (February 2006). With this
2035 umask, such files will be world writeable. (They are all content scanning files
2036 in the spool directory, which isn't world-accessible, so this is not a
2037 disaster, but it's untidy.) I don't want to change this overall setting,
2038 however, because it will interact badly with the open() calls. Instead, there's
2039 now a function called modefopen() that fiddles with the umask while calling
2044 /* Precompile the regular expression for matching a message id. Keep this in
2045 step with the code that generates ids in the accept.c module. We need to do
2046 this here, because the -M options check their arguments for syntactic validity
2047 using mac_ismsgid, which uses this. */
2050 regex_must_compile(US"^(?:"
2051 "[^\\W_]{" str(MESSAGE_ID_TIME_LEN) "}"
2052 "-[^\\W_]{" str(MESSAGE_ID_PID_LEN) "}"
2053 "-[^\\W_]{" str(MESSAGE_ID_SUBTIME_LEN) "}"
2055 "(?:[^\\W_]{6}-){2}[^\\W_]{2}" /* old ID format */
2059 /* Precompile the regular expression that is used for matching an SMTP error
2060 code, possibly extended, at the start of an error message. Note that the
2061 terminating whitespace character is included. */
2064 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
2067 #ifdef WHITELIST_D_MACROS
2068 /* Precompile the regular expression used to filter the content of macros
2069 given to -D for permissibility. */
2071 regex_whitelisted_macro =
2072 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2075 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2076 this seems to be a generally accepted convention, since one finds symbolic
2077 links called "mailq" in standard OS configurations. */
2079 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2080 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2083 receiving_message = FALSE;
2084 called_as = US"-mailq";
2087 /* If the program is called as "rmail" treat it as equivalent to
2088 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2089 i.e. preventing a single dot on a line from terminating the message, and
2090 returning with zero return code, even in cases of error (provided an error
2091 message has been sent). */
2093 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2094 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2097 called_as = US"-rmail";
2098 errors_sender_rc = EXIT_SUCCESS;
2101 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2102 this is a smail convention. */
2104 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2105 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2107 smtp_input = smtp_batched_input = TRUE;
2108 called_as = US"-rsmtp";
2111 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2112 this is a smail convention. */
2114 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2115 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2117 alloc_onetime_qrunner();
2118 receiving_message = FALSE;
2119 called_as = US"-runq";
2122 /* If the program is called as "newaliases" treat it as equivalent to
2123 "exim -bi"; this is a sendmail convention. */
2125 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2126 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2129 receiving_message = FALSE;
2130 called_as = US"-newaliases";
2133 /* Save the original effective uid for a couple of uses later. It should
2134 normally be root, but in some esoteric environments it may not be. */
2136 original_euid = geteuid();
2137 original_egid = getegid();
2139 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2140 to be the same as the real ones. This makes a difference only if Exim is setuid
2141 (or setgid) to something other than root, which could be the case in some
2142 special configurations. */
2144 real_uid = getuid();
2145 real_gid = getgid();
2147 if (real_uid == root_uid)
2149 if ((rv = setgid(real_gid)))
2150 exim_fail("exim: setgid(%ld) failed: %s\n",
2151 (long int)real_gid, strerror(errno));
2152 if ((rv = setuid(real_uid)))
2153 exim_fail("exim: setuid(%ld) failed: %s\n",
2154 (long int)real_uid, strerror(errno));
2157 /* If neither the original real uid nor the original euid was root, Exim is
2158 running in an unprivileged state. */
2160 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2162 /* For most of the args-parsing we need to use permanent pool memory */
2164 int old_pool = store_pool;
2165 store_pool = POOL_PERM;
2167 /* Scan the program's arguments. Some can be dealt with right away; others are
2168 simply recorded for checking and handling afterwards. Do a high-level switch
2169 on the second character (the one after '-'), to save some effort. */
2171 for (i = 1; i < argc; i++)
2173 BOOL badarg = FALSE;
2174 const uschar * arg = argv[i];
2175 const uschar * argrest;
2178 /* An argument not starting with '-' is the start of a recipients list;
2179 break out of the options-scanning loop. */
2187 /* An option consisting of -- terminates the options */
2189 if (Ustrcmp(arg, "--") == 0)
2191 recipients_arg = i + 1;
2195 /* Handle flagged options */
2197 switchchar = arg[1];
2200 /* Make all -ex options synonymous with -oex arguments, since that
2201 is assumed by various callers. Also make -qR options synonymous with -R
2202 options, as that seems to be required as well. Allow for -qqR too, and
2203 the same for -S options. */
2205 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2206 Ustrncmp(arg+1, "qR", 2) == 0 ||
2207 Ustrncmp(arg+1, "qS", 2) == 0)
2209 switchchar = arg[2];
2212 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2214 switchchar = arg[3];
2216 f.queue_2stage = TRUE;
2219 /* Make -r synonymous with -f, since it is a documented alias */
2221 else if (arg[1] == 'r') switchchar = 'f';
2223 /* Make -ov synonymous with -v */
2225 else if (Ustrcmp(arg, "-ov") == 0)
2231 /* deal with --option_aliases */
2232 else if (switchchar == '-')
2234 if (Ustrcmp(argrest, "help") == 0)
2236 usage_wanted = TRUE;
2239 else if (Ustrcmp(argrest, "version") == 0)
2246 /* High-level switch on active initial letter */
2251 /* sendmail uses -Ac and -Am to control which .cf file is used;
2254 if (!*argrest) { badarg = TRUE; break; }
2257 BOOL ignore = FALSE;
2262 if (*(argrest + 1) == '\0')
2266 if (!ignore) badarg = TRUE;
2270 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2271 so has no need of it. */
2274 if (!*argrest) i++; /* Skip over the type */
2280 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2284 /* -bd: Run in daemon mode, awaiting SMTP connections.
2285 -bdf: Ditto, but in the foreground.
2288 f.daemon_listen = f.daemon_scion = TRUE;
2289 if (*argrest == 'f') f.background_daemon = FALSE;
2290 else if (*argrest) badarg = TRUE;
2293 /* -be: Run in expansion test mode
2294 -bem: Ditto, but read a message from a file first
2297 expansion_test = checking = TRUE;
2298 if (*argrest == 'm')
2300 if (++i >= argc) { badarg = TRUE; break; }
2301 expansion_test_message = argv[i];
2304 if (*argrest) badarg = TRUE;
2307 /* -bF: Run system filter test */
2309 filter_test |= checking = FTEST_SYSTEM;
2310 if (*argrest) badarg = TRUE;
2311 else if (++i < argc) filter_test_sfile = argv[i];
2312 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2315 /* -bf: Run user filter test
2316 -bfd: Set domain for filter testing
2317 -bfl: Set local part for filter testing
2318 -bfp: Set prefix for filter testing
2319 -bfs: Set suffix for filter testing
2324 filter_test |= checking = FTEST_USER;
2325 if (++i < argc) filter_test_ufile = argv[i];
2326 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2331 exim_fail("exim: string expected after %s\n", arg);
2332 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2333 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2334 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2335 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2340 /* -bh: Host checking - an IP address must follow. */
2342 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2344 if (++i >= argc) { badarg = TRUE; break; }
2345 sender_host_address = string_copy_taint(
2346 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2348 host_checking = checking = f.log_testing_mode = TRUE;
2349 f.host_checking_callout = *argrest == 'c';
2350 message_logs = FALSE;
2355 /* -bi: This option is used by sendmail to initialize *the* alias file,
2356 though it has the -oA option to specify a different file. Exim has no
2357 concept of *the* alias file, but since Sun's YP make script calls
2358 sendmail this way, some support must be provided. */
2360 if (!*argrest) bi_option = TRUE;
2364 /* -bI: provide information, of the type to follow after a colon.
2365 This is an Exim flag. */
2367 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2369 const uschar * p = argrest+1;
2370 info_flag = CMDINFO_HELP;
2372 if (strcmpic(p, CUS"sieve") == 0)
2374 info_flag = CMDINFO_SIEVE;
2377 else if (strcmpic(p, CUS"dscp") == 0)
2379 info_flag = CMDINFO_DSCP;
2382 else if (strcmpic(p, CUS"help") == 0)
2388 /* -bm: Accept and deliver message - the default option. Reinstate
2389 receiving_message, which got turned off for all -b options.
2390 -bmalware: test the filename given for malware */
2392 if (!*argrest) receiving_message = TRUE;
2393 else if (Ustrcmp(argrest, "alware") == 0)
2395 if (++i >= argc) { badarg = TRUE; break; }
2397 malware_test_file = argv[i];
2402 /* -bnq: For locally originating messages, do not qualify unqualified
2403 addresses. In the envelope, this causes errors; in header lines they
2406 if (Ustrcmp(argrest, "q") == 0)
2408 f.allow_unqualified_sender = FALSE;
2409 f.allow_unqualified_recipient = FALSE;
2414 /* -bpxx: List the contents of the mail queue, in various forms. If
2415 the option is -bpc, just a queue count is needed. Otherwise, if the
2416 first letter after p is r, then order is random. */
2418 if (*argrest == 'c')
2421 if (*++argrest) badarg = TRUE;
2425 if (*argrest == 'r')
2426 list_queue_option = QL_UNSORTED, argrest++;
2428 list_queue_option = QL_BASIC;
2432 /* -bp: List the contents of the mail queue, top-level only */
2436 /* -bpu: List the contents of the mail queue, top-level undelivered */
2438 else if (Ustrcmp(argrest, "u") == 0) list_queue_option |= QL_UNDELIVERED_ONLY;
2440 /* -bpa: List the contents of the mail queue, including all delivered */
2442 else if (Ustrcmp(argrest, "a") == 0) list_queue_option |= QL_PLUS_GENERATED;
2444 /* -bpi: List only message IDs */
2446 else if (Ustrcmp(argrest, "i") == 0) list_queue_option |= QL_MSGID_ONLY;
2448 /* Unknown after -bp[r] */
2454 /* -bP: List the configuration variables given as the address list.
2455 Force -v, so configuration errors get displayed. */
2458 /* -bP config: we need to setup here, because later,
2459 when list_options is checked, the config is read already */
2462 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2465 readconf_save_config(version_string);
2469 list_options = TRUE;
2470 debug_selector |= D_v;
2471 debug_file = stderr;
2475 /* -brt: Test retry configuration lookup */
2477 if (Ustrcmp(argrest, "t") == 0)
2480 test_retry_arg = i + 1;
2484 /* -brw: Test rewrite configuration */
2486 else if (Ustrcmp(argrest, "w") == 0)
2489 test_rewrite_arg = i + 1;
2495 /* -bS: Read SMTP commands on standard input, but produce no replies -
2496 all errors are reported by sending messages. */
2499 smtp_input = smtp_batched_input = receiving_message = TRUE;
2503 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2504 on standard output. */
2506 if (!*argrest) smtp_input = receiving_message = TRUE;
2510 /* -bt: address testing mode */
2513 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2517 /* -bv: verify addresses */
2520 verify_address_mode = checking = f.log_testing_mode = TRUE;
2522 /* -bvs: verify sender addresses */
2524 else if (Ustrcmp(argrest, "s") == 0)
2526 verify_address_mode = checking = f.log_testing_mode = TRUE;
2527 verify_as_sender = TRUE;
2532 /* -bV: Print version string and support details */
2536 printf("Exim version %s #%s built %s\n", version_string,
2537 version_cnumber, version_date);
2538 printf("%s\n", CS version_copyright);
2539 version_printed = TRUE;
2540 show_whats_supported(TRUE);
2541 f.log_testing_mode = TRUE;
2546 /* -bw: inetd wait mode, accept a listening socket as stdin */
2548 f.inetd_wait_mode = TRUE;
2549 f.background_daemon = FALSE;
2550 f.daemon_listen = f.daemon_scion = TRUE;
2552 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2553 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2564 /* -C: change configuration file list; ignore if it isn't really
2565 a change! Enforce a prefix check if required. */
2569 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2570 if (Ustrcmp(config_main_filelist, argrest) != 0)
2572 #ifdef ALT_CONFIG_PREFIX
2574 int len = Ustrlen(ALT_CONFIG_PREFIX);
2575 const uschar *list = argrest;
2577 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2578 while((filename = string_nextinlist(&list, &sep, big_buffer,
2580 if ( ( Ustrlen(filename) < len
2581 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2582 || Ustrstr(filename, "/../") != NULL
2584 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2586 exim_fail("-C Permission denied\n");
2588 if (real_uid != root_uid)
2590 #ifdef TRUSTED_CONFIG_LIST
2592 if (real_uid != exim_uid
2593 #ifdef CONFIGURE_OWNER
2594 && real_uid != config_uid
2597 f.trusted_config = FALSE;
2600 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2603 struct stat statbuf;
2605 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2606 (statbuf.st_uid != root_uid /* owner not root */
2607 #ifdef CONFIGURE_OWNER
2608 && statbuf.st_uid != config_uid /* owner not the special one */
2611 (statbuf.st_gid != root_gid /* group not root */
2612 #ifdef CONFIGURE_GROUP
2613 && statbuf.st_gid != config_gid /* group not the special one */
2615 && (statbuf.st_mode & 020) != 0 /* group writeable */
2617 (statbuf.st_mode & 2) != 0) /* world writeable */
2619 f.trusted_config = FALSE;
2624 /* Well, the trust list at least is up to scratch... */
2626 uschar *trusted_configs[32];
2629 int old_pool = store_pool;
2630 store_pool = POOL_MAIN;
2632 reset_point = store_mark();
2633 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2635 uschar *start = big_buffer, *nl;
2636 while (*start && isspace(*start))
2640 nl = Ustrchr(start, '\n');
2643 trusted_configs[nr_configs++] = string_copy(start);
2644 if (nr_configs == nelem(trusted_configs))
2652 const uschar *list = argrest;
2654 while (f.trusted_config && (filename = string_nextinlist(&list,
2655 &sep, big_buffer, big_buffer_size)))
2657 for (i=0; i < nr_configs; i++)
2658 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2660 if (i == nr_configs)
2662 f.trusted_config = FALSE;
2667 else /* No valid prefixes found in trust_list file. */
2668 f.trusted_config = FALSE;
2669 store_reset(reset_point);
2670 store_pool = old_pool;
2673 else /* Could not open trust_list file. */
2674 f.trusted_config = FALSE;
2677 /* Not root; don't trust config */
2678 f.trusted_config = FALSE;
2682 config_main_filelist = argrest;
2683 f.config_changed = TRUE;
2688 /* -D: set up a macro definition */
2691 #ifdef DISABLE_D_OPTION
2692 exim_fail("exim: -D is not available in this Exim binary\n");
2698 const uschar * s = argrest;
2701 while (isspace(*s)) s++;
2703 if (*s < 'A' || *s > 'Z')
2704 exim_fail("exim: macro name set by -D must start with "
2705 "an upper case letter\n");
2707 while (isalnum(*s) || *s == '_')
2709 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2713 if (ptr == 0) { badarg = TRUE; break; }
2714 while (isspace(*s)) s++;
2717 if (*s++ != '=') { badarg = TRUE; break; }
2718 while (isspace(*s)) s++;
2721 for (m = macros_user; m; m = m->next)
2722 if (Ustrcmp(m->name, name) == 0)
2723 exim_fail("exim: duplicated -D in command line\n");
2725 m = macro_create(name, s, TRUE);
2727 if (clmacro_count >= MAX_CLMACROS)
2728 exim_fail("exim: too many -D options on command line\n");
2729 clmacros[clmacro_count++] =
2730 string_sprintf("-D%s=%s", m->name, m->replacement);
2737 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2739 if (Ustrcmp(argrest, "ropcr") == 0)
2741 /* drop_cr = TRUE; */
2744 /* -dp: Set up a debug pretrigger buffer with given size. */
2746 else if (Ustrcmp(argrest, "p") == 0)
2750 debug_pretrigger_setup(argv[i]);
2752 /* -dt: Set a debug trigger selector */
2754 else if (Ustrncmp(argrest, "t=", 2) == 0)
2755 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2757 /* -d: Set debug level (see also -v below).
2758 If -dd is used, debugging subprocesses of the daemon is disabled. */
2762 /* Use an intermediate variable so that we don't set debugging while
2763 decoding the debugging bits. */
2765 unsigned int selector = D_default;
2768 if (*argrest == 'd')
2770 f.debug_daemon = TRUE;
2774 decode_bits(&selector, 1, debug_notall, argrest,
2775 debug_options, debug_options_count, US"debug", 0);
2776 debug_selector = selector;
2781 /* -E: This is a local error message. This option is not intended for
2782 external use at all, but is not restricted to trusted callers because it
2783 does no harm (just suppresses certain error messages) and if Exim is run
2784 not setuid root it won't always be trusted when it generates error
2785 messages using this option. If there is a message id following -E, point
2786 message_reference at it, for logging. */
2789 f.local_error_message = TRUE;
2790 if (mac_ismsgid(argrest)) message_reference = argrest;
2794 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2795 option, so it looks as if historically the -oex options are also callable
2796 without the leading -o. So we have to accept them. Before the switch,
2797 anything starting -oe has been converted to -e. Exim does not support all
2798 of the sendmail error options. */
2801 if (Ustrcmp(argrest, "e") == 0)
2803 arg_error_handling = ERRORS_SENDER;
2804 errors_sender_rc = EXIT_SUCCESS;
2806 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2807 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2808 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2809 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2814 /* -F: Set sender's full name, used instead of the gecos entry from
2815 the password file. Since users can usually alter their gecos entries,
2816 there's no security involved in using this instead. The data can follow
2817 the -F or be in the next argument. */
2821 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2822 originator_name = string_copy_taint(
2823 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2825 f.sender_name_forced = TRUE;
2829 /* -f: Set sender's address - this value is only actually used if Exim is
2830 run by a trusted user, or if untrusted_set_sender is set and matches the
2831 address, except that the null address can always be set by any user. The
2832 test for this happens later, when the value given here is ignored when not
2833 permitted. For an untrusted user, the actual sender is still put in Sender:
2834 if it doesn't match the From: header (unless no_local_from_check is set).
2835 The data can follow the -f or be in the next argument. The -r switch is an
2836 obsolete form of -f but since there appear to be programs out there that
2837 use anything that sendmail has ever supported, better accept it - the
2838 synonymizing is done before the switch above.
2840 At this stage, we must allow domain literal addresses, because we don't
2841 know what the setting of allow_domain_literals is yet. Ditto for trailing
2842 dots and strip_trailing_dot. */
2846 int dummy_start, dummy_end;
2849 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2850 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2853 uschar * s = store_get(1, GET_UNTAINTED); /* Ensure writeable memory */
2859 const uschar * temp = argrest + Ustrlen(argrest) - 1;
2860 while (temp >= argrest && isspace(*temp)) temp--;
2861 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2862 allow_domain_literals = TRUE;
2863 strip_trailing_dot = TRUE;
2865 allow_utf8_domains = TRUE;
2867 if (!(sender_address = parse_extract_address(argrest, &errmess,
2868 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2869 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2871 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2873 message_smtputf8 = string_is_utf8(sender_address);
2874 allow_utf8_domains = FALSE;
2876 allow_domain_literals = FALSE;
2877 strip_trailing_dot = FALSE;
2879 f.sender_address_forced = TRUE;
2883 /* -G: sendmail invocation to specify that it's a gateway submission and
2884 sendmail may complain about problems instead of fixing them.
2885 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2886 not at this time complain about problems. */
2892 /* -h: Set the hop count for an incoming message. Exim does not currently
2893 support this; it always computes it by counting the Received: headers.
2894 To put it in will require a change to the spool header file format. */
2898 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2899 if (!isdigit(*argrest)) badarg = TRUE;
2903 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2904 not to be documented for sendmail but mailx (at least) uses it) */
2907 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2911 /* -L: set the identifier used for syslog; equivalent to setting
2912 syslog_processname in the config file, but needs to be an admin option. */
2916 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2917 if ((sz = Ustrlen(argrest)) > 32)
2918 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2920 exim_fail("exim: the -L syslog name is too short\n");
2921 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2925 receiving_message = FALSE;
2927 /* -MC: continue delivery of another message via an existing open
2928 file descriptor. This option is used for an internal call by the
2929 smtp transport when there is a pending message waiting to go to an
2930 address to which it has got a connection. Five subsequent arguments are
2931 required: transport name, host name, IP address, sequence number, and
2932 message_id. Transports may decline to create new processes if the sequence
2933 number gets too big. The channel is stdin. This (-MC) must be the last
2934 argument. There's a subsequent check that the real-uid is privileged.
2936 If we are running in the test harness. delay for a bit, to let the process
2937 that set this one up complete. This makes for repeatability of the logging,
2940 if (Ustrcmp(argrest, "C") == 0)
2942 union sockaddr_46 interface_sock;
2943 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2946 exim_fail("exim: too many or too few arguments after -MC\n");
2948 if (msg_action_arg >= 0)
2949 exim_fail("exim: incompatible arguments\n");
2951 continue_transport = string_copy_taint(
2952 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2954 continue_hostname = string_copy_taint(
2955 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2957 continue_host_address = string_copy_taint(
2958 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2960 continue_sequence = Uatoi(argv[++i]);
2961 msg_action = MSG_DELIVER;
2962 msg_action_arg = ++i;
2963 forced_delivery = TRUE;
2964 queue_run_pid = passed_qr_pid;
2965 queue_run_pipe = passed_qr_pipe;
2967 if (!mac_ismsgid(argv[i]))
2968 exim_fail("exim: malformed message id %s after -MC option\n",
2971 /* Set up $sending_ip_address and $sending_port, unless proxied */
2973 if (!continue_proxy_cipher)
2974 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2976 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2979 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2982 testharness_pause_ms(500);
2986 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2990 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2991 precedes -MC (see above). The flag indicates that the host to which
2992 Exim is connected has accepted an AUTH sequence. */
2994 case 'A': f.smtp_authenticated = TRUE; break;
2996 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2997 that exim is connected to supports the esmtp extension DSN */
2999 case 'D': smtp_peer_options |= OPTION_DSN; break;
3001 /* -MCd: for debug, set a process-purpose string */
3003 case 'd': if (++i < argc)
3004 process_purpose = string_copy_taint(
3005 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
3010 /* -MCG: set the queue name, to a non-default value. Arguably, anything
3011 from the commandline should be tainted - but we will need an untainted
3012 value for the spoolfile when doing a -odi delivery process. */
3014 case 'G': if (++i < argc) queue_name = string_copy_taint(
3015 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
3020 /* -MCK: the peer offered CHUNKING. Must precede -MC */
3022 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
3024 #ifndef DISABLE_ESMTP_LIMITS
3025 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
3026 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
3028 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
3030 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
3035 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
3036 it preceded -MC (see above) */
3038 case 'P': smtp_peer_options |= OPTION_PIPE; break;
3040 #ifdef SUPPORT_SOCKS
3041 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
3042 case 'p': proxy_session = TRUE;
3045 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
3048 proxy_local_port = Uatoi(argv[i]);
3051 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
3054 proxy_external_port = Uatoi(argv[i]);
3060 /* -MCQ: pass on the pid of the queue-running process that started
3061 this chain of deliveries and the fd of its synchronizing pipe; this
3062 is useful only when it precedes -MC (see above) */
3064 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
3066 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
3070 /* -MCq: do a quota check on the given recipient for the given size
3071 of message. Separate from -MC. */
3072 case 'q': rcpt_verify_quota = TRUE;
3073 if (++i < argc) message_size = Uatoi(argv[i]);
3077 /* -MCS: set the smtp_use_size flag; this is useful only when it
3078 precedes -MC (see above) */
3080 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3083 /* -MCs: used with -MCt; SNI was sent */
3084 /* -MCr: ditto, DANE */
3087 case 's': if (++i < argc)
3089 continue_proxy_sni = string_copy_taint(
3090 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3092 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3097 /* -MCt: similar to -MCT below but the connection is still open
3098 via a proxy process which handles the TLS context and coding.
3099 Require three arguments for the proxied local address and port,
3100 and the TLS cipher. */
3102 case 't': if (++i < argc)
3103 sending_ip_address = string_copy_taint(
3104 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3108 sending_port = (int)(Uatol(argv[i]));
3111 continue_proxy_cipher = string_copy_taint(
3112 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3117 /* -MCT: set the tls_offered flag; this is useful only when it
3118 precedes -MC (see above). The flag indicates that the host to which
3119 Exim is connected has offered TLS support. */
3121 case 'T': smtp_peer_options |= OPTION_TLS; break;
3124 default: badarg = TRUE; break;
3129 /* -M[x]: various operations on the following list of message ids:
3130 -M deliver the messages, ignoring next retry times and thawing
3131 -Mc deliver the messages, checking next retry times, no thawing
3132 -Mf freeze the messages
3133 -Mg give up on the messages
3134 -Mt thaw the messages
3135 -Mrm remove the messages
3136 In the above cases, this must be the last option. There are also the
3137 following options which are followed by a single message id, and which
3138 act on that message. Some of them use the "recipient" addresses as well.
3139 -Mar add recipient(s)
3140 -MG move to a different queue
3141 -Mmad mark all recipients delivered
3142 -Mmd mark recipients(s) delivered
3144 -Mset load a message for use with -be
3146 -Mvc show copy (of whole message, in RFC 2822 format)
3153 msg_action = MSG_DELIVER;
3154 forced_delivery = f.deliver_force_thaw = TRUE;
3156 else if (Ustrcmp(argrest, "ar") == 0)
3158 msg_action = MSG_ADD_RECIPIENT;
3159 one_msg_action = TRUE;
3161 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3162 else if (Ustrcmp(argrest, "es") == 0)
3164 msg_action = MSG_EDIT_SENDER;
3165 one_msg_action = TRUE;
3167 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3168 else if (Ustrcmp(argrest, "g") == 0)
3170 msg_action = MSG_DELIVER;
3171 deliver_give_up = TRUE;
3173 else if (Ustrcmp(argrest, "G") == 0)
3175 msg_action = MSG_SETQUEUE;
3176 queue_name_dest = string_copy_taint(
3177 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3178 EXIM_DRIVERNAME_MAX, "-MG"),
3181 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3182 else if (Ustrcmp(argrest, "md") == 0)
3184 msg_action = MSG_MARK_DELIVERED;
3185 one_msg_action = TRUE;
3187 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3188 else if (Ustrcmp(argrest, "set") == 0)
3190 msg_action = MSG_LOAD;
3191 one_msg_action = TRUE;
3193 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3194 else if (Ustrcmp(argrest, "vb") == 0)
3196 msg_action = MSG_SHOW_BODY;
3197 one_msg_action = TRUE;
3199 else if (Ustrcmp(argrest, "vc") == 0)
3201 msg_action = MSG_SHOW_COPY;
3202 one_msg_action = TRUE;
3204 else if (Ustrcmp(argrest, "vh") == 0)
3206 msg_action = MSG_SHOW_HEADER;
3207 one_msg_action = TRUE;
3209 else if (Ustrcmp(argrest, "vl") == 0)
3211 msg_action = MSG_SHOW_LOG;
3212 one_msg_action = TRUE;
3214 else { badarg = TRUE; break; }
3216 /* All the -Mxx options require at least one message id. */
3218 msg_action_arg = i + 1;
3219 if (msg_action_arg >= argc)
3220 exim_fail("exim: no message ids given after %s option\n", arg);
3222 /* Some require only message ids to follow */
3224 if (!one_msg_action)
3226 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3227 exim_fail("exim: malformed message id %s after %s option\n",
3229 goto END_ARG; /* Remaining args are ids */
3232 /* Others require only one message id, possibly followed by addresses,
3233 which will be handled as normal arguments. */
3237 if (!mac_ismsgid(argv[msg_action_arg]))
3238 exim_fail("exim: malformed message id %s after %s option\n",
3239 argv[msg_action_arg], arg);
3245 /* Some programs seem to call the -om option without the leading o;
3246 for sendmail it askes for "me too". Exim always does this. */
3249 if (*argrest) badarg = TRUE;
3253 /* -N: don't do delivery - a debugging option that stops transports doing
3254 their thing. It implies debugging at the D_v level. */
3259 f.dont_deliver = TRUE;
3260 debug_selector |= D_v;
3261 debug_file = stderr;
3267 /* -n: This means "don't alias" in sendmail, apparently.
3268 For normal invocations, it has no effect.
3269 It may affect some other options. */
3275 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3276 option to the specified value. This form uses long names. We need to handle
3277 -O option=value and -Ooption=value. */
3282 exim_fail("exim: string expected after -O\n");
3288 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3291 if (!*(alias_arg = argrest))
3292 if (i+1 < argc) alias_arg = argv[++i];
3293 else exim_fail("exim: string expected after -oA\n");
3296 /* -oB: Set a connection message max value for remote deliveries */
3299 const uschar * p = argrest;
3301 if (i+1 < argc && isdigit((argv[i+1][0])))
3305 connection_max_messages = 1;
3312 exim_fail("exim: number expected after -oB\n");
3313 connection_max_messages = Uatoi(p);
3318 /* -odb: background delivery */
3321 if (Ustrcmp(argrest, "b") == 0)
3323 f.synchronous_delivery = FALSE;
3324 arg_queue_only = FALSE;
3325 queue_only_set = TRUE;
3328 /* -odd: testsuite-only: add no inter-process delays */
3330 else if (Ustrcmp(argrest, "d") == 0)
3331 f.testsuite_delays = FALSE;
3333 /* -odf: foreground delivery (smail-compatible option); same effect as
3334 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3337 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3339 f.synchronous_delivery = TRUE;
3340 arg_queue_only = FALSE;
3341 queue_only_set = TRUE;
3344 /* -odq: queue only */
3346 else if (Ustrcmp(argrest, "q") == 0)
3348 f.synchronous_delivery = FALSE;
3349 arg_queue_only = TRUE;
3350 queue_only_set = TRUE;
3353 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3354 but no remote delivery */
3356 else if (Ustrcmp(argrest, "qs") == 0)
3358 f.queue_smtp = TRUE;
3359 arg_queue_only = FALSE;
3360 queue_only_set = TRUE;
3365 /* -oex: Sendmail error flags. As these are also accepted without the
3366 leading -o prefix, for compatibility with vacation and other callers,
3367 they are handled with -e above. */
3369 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3370 -oitrue: Another sendmail syntax for the same */
3373 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3378 /* -oM*: Set various characteristics for an incoming message; actually
3379 acted on for trusted callers only. */
3384 exim_fail("exim: data expected after -oM%s\n", argrest);
3386 /* -oMa: Set sender host address */
3388 if (Ustrcmp(argrest, "a") == 0)
3389 sender_host_address = string_copy_taint(
3390 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3391 EXIM_IPADDR_MAX, "-oMa"), GET_TAINTED);
3393 /* -oMaa: Set authenticator name */
3395 else if (Ustrcmp(argrest, "aa") == 0)
3396 sender_host_authenticated = string_copy_taint(
3397 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3398 EXIM_DRIVERNAME_MAX, "-oMaa"), GET_TAINTED);
3400 /* -oMas: setting authenticated sender */
3402 else if (Ustrcmp(argrest, "as") == 0)
3403 authenticated_sender = string_copy_taint(
3404 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3405 EXIM_EMAILADDR_MAX, "-oMas"), GET_TAINTED);
3407 /* -oMai: setting authenticated id */
3409 else if (Ustrcmp(argrest, "ai") == 0)
3410 authenticated_id = string_copy_taint(
3411 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3412 EXIM_EMAILADDR_MAX, "-oMai"), GET_TAINTED);
3414 /* -oMi: Set incoming interface address */
3416 else if (Ustrcmp(argrest, "i") == 0)
3417 interface_address = string_copy_taint(
3418 exim_str_fail_toolong(next_argv(argv, &i, argc, arg),
3419 EXIM_IPADDR_MAX, "-oMi"), GET_TAINTED);
3421 /* -oMm: Message reference */
3423 else if (Ustrcmp(argrest, "m") == 0)
3425 if (!mac_ismsgid(argv[i+1]))
3426 exim_fail("-oMm must be a valid message ID\n");
3427 if (!f.trusted_config)
3428 exim_fail("-oMm must be called by a trusted user/config\n");
3429 message_reference = next_argv(argv, &i, argc, arg);
3432 /* -oMr: Received protocol */
3434 else if (Ustrcmp(argrest, "r") == 0)
3436 if (received_protocol)
3437 exim_fail("received_protocol is set already\n");
3439 if (++i >= argc) badarg = TRUE;
3441 received_protocol = string_copy_taint(
3442 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-oMr"),
3445 /* -oMs: Set sender host name */
3447 else if (Ustrcmp(argrest, "s") == 0)
3448 if (++i >= argc) badarg = TRUE;
3450 sender_host_name = string_copy_taint(
3451 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-oMs"),
3454 /* -oMt: Set sender ident */
3456 else if (Ustrcmp(argrest, "t") == 0)
3457 if (++i >= argc) badarg = TRUE;
3460 sender_ident_set = TRUE;
3461 sender_ident = string_copy_taint(
3462 exim_str_fail_toolong(argv[i], EXIM_IDENTUSER_MAX, "-oMt"),
3466 /* Else a bad argument */
3473 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3474 seem to call this as -m (undocumented), so that is also accepted (see
3476 /* -oo: An ancient flag for old-style addresses which still seems to
3477 crop up in some calls (see in SCO). */
3481 if (*argrest) badarg = TRUE;
3484 /* -oP <name>: set pid file path for daemon
3485 -oPX: delete pid file of daemon */
3488 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3489 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3490 "(uid=%d euid=%d | %d)\n",
3491 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3493 if (++i < argc) override_pid_file_path = argv[i];
3495 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3500 /* -or <n>: set timeout for non-SMTP acceptance
3501 -os <n>: set timeout for SMTP acceptance */
3506 int * tp = argrest[-1] == 'r'
3507 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3509 *tp = readconf_readtime(argrest, 0, FALSE);
3510 else if (i+1 < argc)
3511 *tp = readconf_readtime(argv[++i], 0, FALSE);
3514 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3518 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3519 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3522 if (*argrest || ++i >= argc) badarg = TRUE;
3523 else override_local_interfaces = string_copy_taint(
3524 exim_str_fail_toolong(argv[i], 1024, "-oX"), GET_TAINTED);
3527 /* -oY: Override creation of daemon notifier socket */
3530 if (*argrest) badarg = TRUE;
3531 else f.notifier_socket_en = FALSE;
3534 /* Unknown -o argument */
3542 /* -ps: force Perl startup; -pd force delayed Perl startup */
3546 if (*argrest == 's' && argrest[1] == 0)
3548 perl_start_option = 1;
3551 if (*argrest == 'd' && argrest[1] == 0)
3553 perl_start_option = -1;
3558 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3559 which sets the host protocol and host name */
3562 argrest = next_argv(argv, &i, argc, arg);
3566 uschar * hn = Ustrchr(argrest, ':');
3568 if (received_protocol)
3569 exim_fail("received_protocol is set already\n");
3572 received_protocol = string_copy_taint(
3573 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3577 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3578 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3579 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3584 /* -q: set up queue runs */
3588 BOOL two_stage, first_del, force, thaw = FALSE, local;
3590 receiving_message = FALSE;
3592 /* -qq...: Do queue runs in a 2-stage manner */
3594 if ((two_stage = *argrest == 'q'))
3597 /* -qi...: Do only first (initial) deliveries */
3599 if ((first_del = *argrest == 'i'))
3602 /* -qf...: Run the queue, forcing deliveries
3603 -qff..: Ditto, forcing thawing as well */
3605 if ((force = *argrest == 'f'))
3606 if ((thaw = *++argrest == 'f'))
3609 /* -q[f][f]l...: Run the queue only on local deliveries */
3611 if ((local = *argrest == 'l'))
3614 /* -q[f][f][l][G<name>]... Work on the named queue */
3616 if (*argrest == 'G')
3619 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3620 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3621 queue_name = string_copyn(argrest, i);
3623 if (*argrest == '/') argrest++;
3626 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3627 only, optionally named, optionally starting from a given message id. */
3629 if (!(list_queue || count_queue))
3634 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3636 q = alloc_onetime_qrunner();
3637 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3638 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3639 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3640 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3643 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3644 forced, optionally local only, optionally named. */
3651 if (*argrest) s = argrest;
3652 else if (++i < argc) { badarg = TRUE; break; }
3655 if ((intvl = readconf_readtime(s, 0, FALSE)) <= 0)
3656 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3658 for (qrunner * qq = qrunners; qq; qq = qq->next)
3659 if ( queue_name && qq->name && Ustrcmp(queue_name, qq->name) == 0
3660 || !queue_name && !qq->name)
3661 exim_fail("exim: queue-runner specified more than once\n");
3663 q = alloc_qrunner();
3664 q->interval = intvl;
3667 q->name = *queue_name ? queue_name : NULL; /* will be NULL for the default queue */
3668 q->queue_run_force = force;
3669 q->deliver_force_thaw = thaw;
3670 q->queue_run_first_delivery = first_del;
3671 q->queue_run_local = local;
3672 q->queue_2stage = two_stage;
3679 case 'R': /* Synonymous with -qR... */
3680 case 'S': /* Synonymous with -qS... */
3682 const uschar * tainted_selectstr;
3685 receiving_message = FALSE;
3687 /* -Rf: As -R (below) but force all deliveries,
3688 -Rff: Ditto, but also thaw all frozen messages,
3689 -Rr: String is regex
3690 -Rrf: Regex and force
3691 -Rrff: Regex and force and thaw
3693 -S...: Like -R but works on sender.
3695 in all cases provided there are no further characters in this
3698 if (!qrunners) alloc_onetime_qrunner();
3699 qrunners->queue_2stage = f.queue_2stage;
3701 for (int i = 0; i < nelem(rsopts); i++)
3702 if (Ustrcmp(argrest, rsopts[i]) == 0)
3704 if (i != 2) qrunners->queue_run_force = TRUE;
3706 if (switchchar == 'R')
3707 f.deliver_selectstring_regex = TRUE;
3709 f.deliver_selectstring_sender_regex = TRUE;
3710 if (i == 1 || i == 4) qrunners->deliver_force_thaw = TRUE;
3711 argrest += Ustrlen(rsopts[i]);
3714 /* -R or -S: Set string to match in addresses for forced queue run to
3715 pick out particular messages. */
3717 /* Avoid attacks from people providing very long strings, and do so before
3720 tainted_selectstr = argrest;
3721 else if (i+1 < argc)
3722 tainted_selectstr = argv[++i];
3724 exim_fail("exim: string expected after %s\n", switchchar == 'R' ? "-R" : "-S");
3726 s = string_copy_taint(
3727 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3730 if (switchchar == 'R')
3731 deliver_selectstring = s;
3733 deliver_selectstring_sender = s;
3738 /* -r: an obsolete synonym for -f (see above) */
3740 /* -Tqt is an option that is exclusively for use by the testing suite.
3741 It is not recognized in other circumstances. It allows for the setting up
3742 of explicit "queue times" so that various warning/retry things can be
3743 tested. Otherwise variability of clock ticks etc. cause problems. */
3746 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0 && ++i < argc)
3747 fudged_queue_times = string_copy_taint(argv[i], GET_TAINTED);
3752 /* -t: Set flag to extract recipients from body of message. */
3755 if (!*argrest) extract_recipients = TRUE;
3757 /* -ti: Set flag to extract recipients from body of message, and also
3758 specify that dot does not end the message. */
3760 else if (Ustrcmp(argrest, "i") == 0)
3762 extract_recipients = TRUE;
3766 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3769 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3776 /* -U: This means "initial user submission" in sendmail, apparently. The
3777 doc claims that in future sendmail may refuse syntactically invalid
3778 messages instead of fixing them. For the moment, we just ignore it. */
3784 /* -v: verify things - this is a very low-level debugging */
3789 debug_selector |= D_v;
3790 debug_file = stderr;
3796 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3798 The -x flag tells the sendmail command that mail from a local
3799 mail program has National Language Support (NLS) extended characters
3800 in the body of the mail item. The sendmail command can send mail with
3801 extended NLS characters across networks that normally corrupts these
3804 As Exim is 8-bit clean, it just ignores this flag. */
3807 if (*argrest) badarg = TRUE;
3810 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3811 logs to that file. We swallow the parameter and otherwise ignore it. */
3816 exim_fail("exim: string expected after -X\n");
3819 /* -z: a line of text to log */
3824 log_oneline = string_copy_taint(
3825 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3828 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3831 /* All other initial characters are errors */
3836 } /* End of high-level switch statement */
3838 /* Failed to recognize the option, or syntax error */
3841 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3842 "option %s\n", arg);
3846 /* If -R or -S have been specified without -q, assume a single queue run. */
3848 if ((deliver_selectstring || deliver_selectstring_sender) && !qrunners)
3849 alloc_onetime_qrunner();
3853 store_pool = old_pool;
3856 /* If usage_wanted is set we call the usage function - which never returns */
3857 if (usage_wanted) exim_usage(called_as);
3859 /* Arguments have been processed. Check for incompatibilities. */
3860 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3861 && ( f.daemon_listen || qrunners || bi_option
3862 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3863 || filter_test != FTEST_NONE
3864 || msg_action_arg > 0 && !one_msg_action
3866 || ( msg_action_arg > 0
3867 && ( f.daemon_listen || is_multiple_qrun() || list_options
3868 || checking && msg_action != MSG_LOAD
3869 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3871 || ( (f.daemon_listen || is_multiple_qrun())
3872 && ( sender_address || list_options || list_queue || checking
3875 || f.daemon_listen && is_onetime_qrun()
3876 || f.inetd_wait_mode && qrunners
3878 && ( checking || smtp_input || extract_recipients
3879 || filter_test != FTEST_NONE || bi_option
3881 || ( verify_address_mode
3882 && ( f.address_test_mode || smtp_input || extract_recipients
3883 || filter_test != FTEST_NONE || bi_option
3885 || ( f.address_test_mode
3886 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3890 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3892 || deliver_selectstring && !qrunners
3893 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3895 exim_fail("exim: incompatible command-line options or arguments\n");
3897 /* If debugging is set up, set the file and the file descriptor to pass on to
3898 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3899 to run in the foreground. */
3901 if (debug_selector != 0)
3903 debug_file = stderr;
3904 debug_fd = fileno(debug_file);
3905 f.background_daemon = FALSE;
3906 testharness_pause_ms(100); /* lets caller finish */
3907 if (debug_selector != D_v) /* -v only doesn't show this */
3909 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3910 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3912 if (!version_printed)
3913 show_whats_supported(FALSE);
3917 /* When started with root privilege, ensure that the limits on the number of
3918 open files and the number of processes (where that is accessible) are
3919 sufficiently large, or are unset, in case Exim has been called from an
3920 environment where the limits are screwed down. Not all OS have the ability to
3921 change some of these limits. */
3925 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3931 #ifdef RLIMIT_NOFILE
3932 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3934 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3936 rlp.rlim_cur = rlp.rlim_max = 0;
3939 /* I originally chose 1000 as a nice big number that was unlikely to
3940 be exceeded. It turns out that some older OS have a fixed upper limit of
3943 if (rlp.rlim_cur < 1000)
3945 rlp.rlim_cur = rlp.rlim_max = 1000;
3946 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3948 rlp.rlim_cur = rlp.rlim_max = 256;
3949 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3950 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3957 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3959 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3961 rlp.rlim_cur = rlp.rlim_max = 0;
3964 # ifdef RLIM_INFINITY
3965 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3967 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3969 if (rlp.rlim_cur < 1000)
3971 rlp.rlim_cur = rlp.rlim_max = 1000;
3973 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3974 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3980 /* Exim is normally entered as root (but some special configurations are
3981 possible that don't do this). However, it always spins off sub-processes that
3982 set their uid and gid as required for local delivery. We don't want to pass on
3983 any extra groups that root may belong to, so we want to get rid of them all at
3986 We need to obey setgroups() at this stage, before possibly giving up root
3987 privilege for a changed configuration file, but later on we might need to
3988 check on the additional groups for the admin user privilege - can't do that
3989 till after reading the config, which might specify the exim gid. Therefore,
3990 save the group list here first. */
3992 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3993 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3995 /* There is a fundamental difference in some BSD systems in the matter of
3996 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3997 known not to be different. On the "different" systems there is a single group
3998 list, and the first entry in it is the current group. On all other versions of
3999 Unix there is a supplementary group list, which is in *addition* to the current
4000 group. Consequently, to get rid of all extraneous groups on a "standard" system
4001 you pass over 0 groups to setgroups(), while on a "different" system you pass
4002 over a single group - the current group, which is always the first group in the
4003 list. Calling setgroups() with zero groups on a "different" system results in
4004 an error return. The following code should cope with both types of system.
4006 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
4007 the "setgroups() with zero groups" - and changes the egid.
4008 Thanks to that we had to stash the original_egid above, for use below
4009 in the call to exim_setugid().
4011 However, if this process isn't running as root, setgroups() can't be used
4012 since you have to be root to run it, even if throwing away groups.
4013 Except, sigh, for Hurd - where you can.
4014 Not being root here happens only in some unusual configurations. */
4017 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
4018 && setgroups(0, NULL) != 0
4020 && setgroups(1, group_list) != 0)
4021 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
4023 /* If the configuration file name has been altered by an argument on the
4024 command line (either a new file name or a macro definition) and the caller is
4025 not root, or if this is a filter testing run, remove any setuid privilege the
4026 program has and run as the underlying user.
4028 The exim user is locked out of this, which severely restricts the use of -C
4031 Otherwise, set the real ids to the effective values (should be root unless run
4032 from inetd, which it can either be root or the exim uid, if one is configured).
4034 There is a private mechanism for bypassing some of this, in order to make it
4035 possible to test lots of configurations automatically, without having either to
4036 recompile each time, or to patch in an actual configuration file name and other
4037 values (such as the path name). If running in the test harness, pretend that
4038 configuration file changes and macro definitions haven't happened. */
4041 (!f.trusted_config || /* Config changed, or */
4042 !macros_trusted(opt_D_used)) && /* impermissible macros and */
4043 real_uid != root_uid && /* Not root, and */
4044 !f.running_in_test_harness /* Not fudged */
4046 expansion_test /* expansion testing */
4048 filter_test != FTEST_NONE) /* Filter testing */
4050 setgroups(group_count, group_list);
4051 exim_setugid(real_uid, real_gid, FALSE,
4052 US"-C, -D, -be or -bf forces real uid");
4053 removed_privilege = TRUE;
4055 /* In the normal case when Exim is called like this, stderr is available
4056 and should be used for any logging information because attempts to write
4057 to the log will usually fail. To arrange this, we unset really_exim. However,
4058 if no stderr is available there is no point - we might as well have a go
4059 at the log (if it fails, syslog will be written).
4061 Note that if the invoker is Exim, the logs remain available. Messing with
4062 this causes unlogged successful deliveries. */
4064 if (log_stderr && real_uid != exim_uid)
4065 f.really_exim = FALSE;
4068 /* Privilege is to be retained for the moment. It may be dropped later,
4069 depending on the job that this Exim process has been asked to do. For now, set
4070 the real uid to the effective so that subsequent re-execs of Exim are done by a
4074 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4076 /* If testing a filter, open the file(s) now, before wasting time doing other
4077 setups and reading the message. */
4079 if (filter_test & FTEST_SYSTEM)
4080 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4081 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4084 if (filter_test & FTEST_USER)
4085 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4086 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4089 /* Initialise lookup_list
4090 If debugging, already called above via version reporting.
4091 In either case, we initialise the list of available lookups while running
4092 as root. All dynamically modules are loaded from a directory which is
4093 hard-coded into the binary and is code which, if not a module, would be
4094 part of Exim already. Ability to modify the content of the directory
4095 is equivalent to the ability to modify a setuid binary!
4097 This needs to happen before we read the main configuration. */
4100 /*XXX this excrescence could move to the testsuite standard config setup file */
4102 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4105 /* Read the main runtime configuration data; this gives up if there
4106 is a failure. It leaves the configuration file open so that the subsequent
4107 configuration data for delivery can be read if needed.
4109 NOTE: immediately after opening the configuration file we change the working
4110 directory to "/"! Later we change to $spool_directory. We do it there, because
4111 during readconf_main() some expansion takes place already. */
4113 /* Store the initial cwd before we change directories. Can be NULL if the
4114 dir has already been unlinked. */
4115 initial_cwd = os_getcwd(NULL, 0);
4116 if (!initial_cwd && errno)
4117 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4119 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4120 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4123 -be[m] expansion test -
4124 -b[fF] filter test new
4126 -bmalware malware_test_file new
4128 -brw rewrite test new
4130 -bv[s] address verify -
4132 -bP <option> (except -bP config, which sets list_config)
4134 If any of these options is set, we suppress warnings about configuration
4135 issues (currently about tls_advertise_hosts and keep_environment not being
4139 int old_pool = store_pool;
4140 #ifdef MEASURE_TIMING
4142 (void)gettimeofday(&t0, NULL);
4145 store_pool = POOL_CONFIG;
4146 readconf_main(checking || list_options);
4147 store_pool = old_pool;
4149 #ifdef MEASURE_TIMING
4150 report_time_since(&t0, US"readconf_main (delta)");
4154 /* Now in directory "/" */
4156 if (cleanup_environment() == FALSE)
4157 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4160 /* If an action on specific messages is requested, or if a daemon or queue
4161 runner is being started, we need to know if Exim was called by an admin user.
4162 This is the case if the real user is root or exim, or if the real group is
4163 exim, or if one of the supplementary groups is exim or a group listed in
4164 admin_groups. We don't fail all message actions immediately if not admin_user,
4165 since some actions can be performed by non-admin users. Instead, set admin_user
4166 for later interrogation. */
4168 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4169 f.admin_user = TRUE;
4171 for (int i = 0; i < group_count && !f.admin_user; i++)
4172 if (group_list[i] == exim_gid)
4173 f.admin_user = TRUE;
4174 else if (admin_groups)
4175 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4176 if (admin_groups[j] == group_list[i])
4177 f.admin_user = TRUE;
4179 /* Another group of privileged users are the trusted users. These are root,
4180 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4181 are permitted to specify sender_addresses with -f on the command line, and
4182 other message parameters as well. */
4184 if (real_uid == root_uid || real_uid == exim_uid)
4185 f.trusted_caller = TRUE;
4189 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4190 if (trusted_users[i] == real_uid)
4191 f.trusted_caller = TRUE;
4194 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4195 if (trusted_groups[i] == real_gid)
4196 f.trusted_caller = TRUE;
4197 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4198 if (trusted_groups[i] == group_list[j])
4199 f.trusted_caller = TRUE;
4202 /* At this point, we know if the user is privileged and some command-line
4203 options become possibly impermissible, depending upon the configuration file. */
4205 if (checking && commandline_checks_require_admin && !f.admin_user)
4206 exim_fail("exim: those command-line flags are set to require admin\n");
4208 /* Handle the decoding of logging options. */
4210 decode_bits(log_selector, log_selector_size, log_notall,
4211 log_selector_string, log_options, log_options_count, US"log", 0);
4215 debug_printf("configuration file is %s\n", config_main_filename);
4216 debug_printf("log selectors =");
4217 for (int i = 0; i < log_selector_size; i++)
4218 debug_printf(" %08x", log_selector[i]);
4222 /* If domain literals are not allowed, check the sender address that was
4223 supplied with -f. Ditto for a stripped trailing dot. */
4227 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4228 exim_fail("exim: bad -f address \"%s\": domain literals not "
4229 "allowed\n", sender_address);
4230 if (f_end_dot && !strip_trailing_dot)
4231 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4232 "(trailing dot not allowed)\n", sender_address);
4235 /* See if an admin user overrode our logging. */
4237 if (cmdline_syslog_name)
4240 syslog_processname = cmdline_syslog_name;
4241 log_file_path = string_copy(CUS"syslog");
4244 /* not a panic, non-privileged users should not be able to spam paniclog */
4246 "exim: you lack sufficient privilege to specify syslog process name\n");
4248 /* Paranoia check of maximum lengths of certain strings. There is a check
4249 on the length of the log file path in log.c, which will come into effect
4250 if there are any calls to write the log earlier than this. However, if we
4251 get this far but the string is very long, it is better to stop now than to
4252 carry on and (e.g.) receive a message and then have to collapse. The call to
4253 log_write() from here will cause the ultimate panic collapse if the complete
4254 file name exceeds the buffer length. */
4256 if (Ustrlen(log_file_path) > 200)
4257 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4258 "log_file_path is longer than 200 chars: aborting");
4260 if (Ustrlen(pid_file_path) > 200)
4261 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4262 "pid_file_path is longer than 200 chars: aborting");
4264 if (Ustrlen(spool_directory) > 200)
4265 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4266 "spool_directory is longer than 200 chars: aborting");
4268 /* Length check on the process name given to syslog for its TAG field,
4269 which is only permitted to be 32 characters or less. See RFC 3164. */
4271 if (Ustrlen(syslog_processname) > 32)
4272 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4273 "syslog_processname is longer than 32 chars: aborting");
4278 log_write(0, LOG_MAIN, "%s", log_oneline);
4279 return EXIT_SUCCESS;
4282 return EXIT_FAILURE;
4284 /* In some operating systems, the environment variable TMPDIR controls where
4285 temporary files are created; Exim doesn't use these (apart from when delivering
4286 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4287 If TMPDIR is found in the environment, reset it to the value defined in the
4288 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4289 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4290 EXIM_TMPDIR by the build scripts.
4294 if (environ) for (uschar ** p = USS environ; *p; p++)
4295 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4297 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4298 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4300 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4304 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4305 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4306 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4307 called by a user who has set the TZ variable. This then affects the timestamps
4308 in log files and in Received: headers, and any created Date: header lines. The
4309 required timezone is settable in the configuration file, so nothing can be done
4310 about this earlier - but hopefully nothing will normally be logged earlier than
4311 this. We have to make a new environment if TZ is wrong, but don't bother if
4312 timestamps_utc is set, because then all times are in UTC anyway. */
4314 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4315 f.timestamps_utc = TRUE;
4318 uschar *envtz = US getenv("TZ");
4320 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4321 : timezone_string != NULL
4324 uschar **p = USS environ;
4328 if (environ) while (*p++) count++;
4329 if (!envtz) count++;
4330 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4331 if (environ) for (p = USS environ; *p; p++)
4332 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4333 if (timezone_string)
4335 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4336 sprintf(CS *newp++, "TZ=%s", timezone_string);
4341 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4342 tod_stamp(tod_log));
4346 /* Handle the case when we have removed the setuid privilege because of -C or
4347 -D. This means that the caller of Exim was not root.
4349 There is a problem if we were running as the Exim user. The sysadmin may
4350 expect this case to retain privilege because "the binary was called by the
4351 Exim user", but it hasn't, because either the -D option set macros, or the
4352 -C option set a non-trusted configuration file. There are two possibilities:
4354 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4355 to do message deliveries. Thus, the fact that it is running as a
4356 non-privileged user is plausible, and might be wanted in some special
4357 configurations. However, really_exim will have been set false when
4358 privilege was dropped, to stop Exim trying to write to its normal log
4359 files. Therefore, re-enable normal log processing, assuming the sysadmin
4360 has set up the log directory correctly.
4362 (2) If deliver_drop_privilege is not set, the configuration won't work as
4363 apparently intended, and so we log a panic message. In order to retain
4364 root for -C or -D, the caller must either be root or be invoking a
4365 trusted configuration file (when deliver_drop_privilege is false). */
4367 if ( removed_privilege
4368 && (!f.trusted_config || opt_D_used)
4369 && real_uid == exim_uid)
4370 if (deliver_drop_privilege)
4371 f.really_exim = TRUE; /* let logging work normally */
4373 log_write(0, LOG_MAIN|LOG_PANIC,
4374 "exim user lost privilege for using %s option",
4375 f.trusted_config? "-D" : "-C");
4377 /* Start up Perl interpreter if Perl support is configured and there is a
4378 perl_startup option, and the configuration or the command line specifies
4379 initializing starting. Note that the global variables are actually called
4380 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4383 if (perl_start_option != 0)
4384 opt_perl_at_start = (perl_start_option > 0);
4385 if (opt_perl_at_start && opt_perl_startup != NULL)
4388 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4389 if ((errstr = init_perl(opt_perl_startup)))
4390 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4391 opt_perl_started = TRUE;
4393 #endif /* EXIM_PERL */
4395 /* Log the arguments of the call if the configuration file said so. This is
4396 a debugging feature for finding out what arguments certain MUAs actually use.
4397 Don't attempt it if logging is disabled, or if listing variables or if
4398 verifying/testing addresses or expansions. */
4400 if ( (debug_selector & D_any || LOGGING(arguments))
4401 && f.really_exim && !list_options && !checking)
4403 uschar *p = big_buffer;
4404 Ustrcpy(p, US"cwd= (failed)");
4411 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4412 p += Ustrlen(CCS p);
4415 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4417 for (int i = 0; i < argc; i++)
4419 int len = Ustrlen(argv[i]);
4420 const uschar *printing;
4422 if (p + len + 8 >= big_buffer + big_buffer_size)
4424 Ustrcpy(p, US" ...");
4425 log_write(0, LOG_MAIN, "%s", big_buffer);
4426 Ustrcpy(big_buffer, US"...");
4429 printing = string_printing(argv[i]);
4430 if (!*printing) quote = US"\"";
4433 const uschar *pp = printing;
4435 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4437 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4438 (p - big_buffer) - 4), printing, quote);
4441 if (LOGGING(arguments))
4442 log_write(0, LOG_MAIN, "%s", big_buffer);
4444 debug_printf("%s\n", big_buffer);
4447 /* Set the working directory to be the top-level spool directory. We don't rely
4448 on this in the code, which always uses fully qualified names, but it's useful
4449 for core dumps etc. Don't complain if it fails - the spool directory might not
4450 be generally accessible and calls with the -C option (and others) have lost
4451 privilege by now. Before the chdir, we try to ensure that the directory exists.
4454 if (Uchdir(spool_directory) != 0)
4456 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4457 (void) Uchdir(spool_directory);
4460 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4461 alias file. Exim doesn't have such a concept, but this call is screwed into
4462 Sun's YP makefiles. Handle this by calling a configured script, as the real
4463 user who called Exim. The -oA option can be used to pass an argument to the
4468 (void) fclose(config_file);
4469 if (bi_command && *bi_command)
4472 const uschar * argv[3];
4473 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4474 if (alias_arg) argv[i++] = alias_arg;
4477 setgroups(group_count, group_list);
4478 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4480 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4481 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4483 execv(CS argv[0], (char *const *)argv);
4484 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4488 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4493 /* We moved the admin/trusted check to be immediately after reading the
4494 configuration file. We leave these prints here to ensure that syslog setup,
4495 logfile setup, and so on has already happened. */
4497 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4498 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4500 /* Only an admin user may start the daemon or force a queue run in the default
4501 configuration, but the queue run restriction can be relaxed. Only an admin
4502 user may request that a message be returned to its sender forthwith. Only an
4503 admin user may specify a debug level greater than D_v (because it might show
4504 passwords, etc. in lookup queries). Only an admin user may request a queue
4505 count. Only an admin user can use the test interface to scan for email
4506 (because Exim will be in the spool dir and able to look at mails). */
4510 BOOL debugset = (debug_selector & ~D_v) != 0;
4511 if ( deliver_give_up || f.daemon_listen || malware_test_file
4512 || count_queue && queue_list_requires_admin
4513 || list_queue && queue_list_requires_admin
4514 || qrunners && prod_requires_admin
4515 || queue_name_dest && prod_requires_admin
4516 || debugset && !f.running_in_test_harness
4518 exim_fail("exim:%s permission denied; not admin\n",
4519 debugset ? " debugging" : "");
4522 /* If the real user is not root or the exim uid, the argument for passing
4523 in an open TCP/IP connection for another message is not permitted, nor is
4524 running with the -N option for any delivery action, unless this call to exim is
4525 one that supplied an input message, or we are using a patched exim for
4526 regression testing. */
4528 if ( real_uid != root_uid && real_uid != exim_uid
4529 && ( continue_hostname
4531 && (qrunners || f.daemon_listen || msg_action_arg > 0)
4533 && !f.running_in_test_harness
4535 exim_fail("exim: Permission denied; not exim user or root\n");
4537 /* If the caller is not trusted, certain arguments are ignored when running for
4538 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4539 Note that authority for performing certain actions on messages is tested in the
4540 queue_action() function. */
4542 if (!f.trusted_caller && !checking)
4544 sender_host_name = sender_host_address = interface_address =
4545 sender_ident = received_protocol = NULL;
4546 sender_host_port = interface_port = 0;
4547 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4550 /* If a sender host address is set, extract the optional port number off the
4551 end of it and check its syntax. Do the same thing for the interface address.
4552 Exim exits if the syntax is bad. */
4556 if (sender_host_address)
4557 sender_host_port = check_port(sender_host_address);
4558 if (interface_address)
4559 interface_port = check_port(interface_address);
4562 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4565 if (f.trusted_caller)
4567 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4568 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4571 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4574 /* If an SMTP message is being received check to see if the standard input is a
4575 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4576 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4581 union sockaddr_46 inetd_sock;
4582 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4583 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4585 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4586 if (family == AF_INET || family == AF_INET6)
4588 union sockaddr_46 interface_sock;
4589 size = sizeof(interface_sock);
4591 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4592 interface_address = host_ntoa(-1, &interface_sock, NULL,
4595 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4597 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4600 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4601 NULL, &sender_host_port);
4602 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4603 "inetd is not supported when mua_wrapper is set");
4607 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4612 /* If the load average is going to be needed while receiving a message, get it
4613 now for those OS that require the first call to os_getloadavg() to be done as
4614 root. There will be further calls later for each message received. */
4616 #ifdef LOAD_AVG_NEEDS_ROOT
4617 if ( receiving_message
4618 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4619 load_average = OS_GETLOADAVG();
4622 /* The queue_only configuration option can be overridden by -odx on the command
4623 line, except that if queue_only_override is false, queue_only cannot be unset
4624 from the command line. */
4626 if (queue_only_set && (queue_only_override || arg_queue_only))
4627 queue_only = arg_queue_only;
4629 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4632 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4633 if (arg_smtp_receive_timeout >= 0)
4634 smtp_receive_timeout = arg_smtp_receive_timeout;
4636 /* If Exim was started with root privilege, unless we have already removed the
4637 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4638 except when starting the daemon or doing some kind of delivery or address
4639 testing (-bt). These are the only cases when root need to be retained. We run
4640 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4641 retained only for starting the daemon. We always do the initgroups() in this
4642 situation (controlled by the TRUE below), in order to be as close as possible
4643 to the state Exim usually runs in. */
4645 if ( !unprivileged /* originally had root AND */
4646 && !removed_privilege /* still got root AND */
4647 && !f.daemon_listen /* not starting the daemon */
4648 && (!qrunners || is_onetime_qrun()) /* (either kind of daemon) */
4649 && ( /* AND EITHER */
4650 deliver_drop_privilege /* requested unprivileged */
4652 !qrunners /* not running the queue */
4653 && ( msg_action_arg < 0 /* and */
4654 || msg_action != MSG_DELIVER /* not delivering */
4656 && (!checking || !f.address_test_mode) /* not address checking */
4657 && !rcpt_verify_quota /* and not quota checking */
4659 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4661 /* When we are retaining a privileged uid, we still change to the exim gid. */
4666 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4667 rv = setgid(exim_gid);
4668 /* Impact of failure is that some stuff might end up with an incorrect group.
4669 We track this for failures from root, since any attempt to change privilege
4670 by root should succeed and failures should be examined. For non-root,
4671 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4672 no need to complain then. */
4674 if (!(unprivileged || removed_privilege))
4675 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4678 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4679 (long int)exim_gid, strerror(errno));
4683 /* Handle a request to scan a file for malware */
4684 if (malware_test_file)
4686 #ifdef WITH_CONTENT_SCAN
4688 set_process_info("scanning file for malware");
4689 if ((result = malware_in_file(malware_test_file)) == FAIL)
4691 printf("No malware found.\n");
4696 printf("Malware lookup returned non-okay/fail: %d\n", result);
4700 printf("Malware found: %s\n", malware_name);
4702 printf("Malware scan detected malware of unknown name.\n");
4704 printf("Malware scanning not enabled at compile time.\n");
4709 /* Handle a request to list the delivery queue */
4713 set_process_info("listing the queue");
4714 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4718 /* Handle a request to count the delivery queue */
4722 set_process_info("counting the queue");
4723 fprintf(stdout, "%u\n", queue_count());
4727 /* Handle actions on specific messages, except for the force delivery and
4728 message load actions, which are done below. Some actions take a whole list of
4729 message ids, which are known to continue up to the end of the arguments. Others
4730 take a single message id and then operate on the recipients list. */
4732 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4734 int yield = EXIT_SUCCESS;
4735 set_process_info("acting on specified messages");
4737 /* ACL definitions may be needed when removing a message (-Mrm) because
4738 event_action gets expanded */
4740 if (msg_action == MSG_REMOVE)
4742 int old_pool = store_pool;
4743 store_pool = POOL_CONFIG;
4745 store_pool = old_pool;
4746 store_writeprotect(POOL_CONFIG);
4749 if (!one_msg_action)
4751 for (i = msg_action_arg; i < argc; i++)
4752 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4753 yield = EXIT_FAILURE;
4756 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4757 default: printf("\n"); break;
4761 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4762 recipients_arg)) yield = EXIT_FAILURE;
4766 /* We used to set up here to skip reading the ACL section, on
4767 (msg_action_arg > 0 || (is_onetime_qrun() && !f.daemon_listen)
4768 Now, since the intro of the ${acl } expansion, ACL definitions may be
4769 needed in transports so we lost the optimisation. */
4772 int old_pool = store_pool;
4773 #ifdef MEASURE_TIMING
4775 (void)gettimeofday(&t0, NULL);
4778 store_pool = POOL_CONFIG;
4780 store_pool = old_pool;
4782 /* -be can add macro definitions, needing to link to the macro structure
4783 chain. Otherwise, make the memory used for config data readonly. */
4785 if (!expansion_test)
4786 store_writeprotect(POOL_CONFIG);
4788 #ifdef MEASURE_TIMING
4789 report_time_since(&t0, US"readconf_rest (delta)");
4793 /* Handle a request to check quota */
4794 if (rcpt_verify_quota)
4795 if (real_uid != root_uid && real_uid != exim_uid)
4796 exim_fail("exim: Permission denied\n");
4797 else if (recipients_arg >= argc)
4798 exim_fail("exim: missing recipient for quota check\n");
4801 verify_quota(US argv[recipients_arg]); /*XXX we lose track of const here */
4802 exim_exit(EXIT_SUCCESS);
4805 /* Handle the -brt option. This is for checking out retry configurations.
4806 The next three arguments are a domain name or a complete address, and
4807 optionally two error numbers. All it does is to call the function that
4808 scans the retry configuration data. */
4810 if (test_retry_arg >= 0)
4812 retry_config *yield;
4813 int basic_errno = 0;
4815 const uschar *s1, *s2;
4817 if (test_retry_arg >= argc)
4819 printf("-brt needs a domain or address argument\n");
4820 exim_exit(EXIT_FAILURE);
4822 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4825 /* If the first argument contains no @ and no . it might be a local user
4826 or it might be a single-component name. Treat as a domain. */
4828 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4830 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4831 "being \ntreated as a one-component domain, not as a local part.\n\n",
4835 /* There may be an optional second domain arg. */
4837 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4838 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4840 /* The final arg is an error name */
4842 if (test_retry_arg < argc)
4844 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4846 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4849 printf("%s\n", CS error);
4850 return EXIT_FAILURE;
4853 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4854 code > 100 as an error is for matching codes to the decade. Turn them into
4855 a real error code, off the decade. */
4857 if (basic_errno == ERRNO_MAIL4XX ||
4858 basic_errno == ERRNO_RCPT4XX ||
4859 basic_errno == ERRNO_DATA4XX)
4861 int code = (more_errno >> 8) & 255;
4863 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4864 else if (code > 100)
4865 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4869 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4870 printf("No retry information found\n");
4873 more_errno = yield->more_errno;
4874 printf("Retry rule: %s ", yield->pattern);
4876 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4878 printf("quota%s%s ",
4879 (more_errno > 0)? "_" : "",
4880 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4882 else if (yield->basic_errno == ECONNREFUSED)
4884 printf("refused%s%s ",
4885 (more_errno > 0)? "_" : "",
4886 (more_errno == 'M')? "MX" :
4887 (more_errno == 'A')? "A" : "");
4889 else if (yield->basic_errno == ETIMEDOUT)
4892 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4894 if (more_errno != 0) printf("_%s",
4895 (more_errno == 'M')? "MX" : "A");
4898 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4899 printf("auth_failed ");
4902 for (retry_rule * r = yield->rules; r; r = r->next)
4904 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4905 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4911 printf(",%d.", x/1000);
4925 exim_exit(EXIT_SUCCESS);
4928 /* Handle a request to list one or more configuration options */
4929 /* If -n was set, we suppress some information */
4934 set_process_info("listing variables");
4935 if (recipients_arg >= argc)
4936 fail = !readconf_print(US"all", NULL, flag_n);
4937 else for (i = recipients_arg; i < argc; i++)
4940 (Ustrcmp(argv[i], "router") == 0 ||
4941 Ustrcmp(argv[i], "transport") == 0 ||
4942 Ustrcmp(argv[i], "authenticator") == 0 ||
4943 Ustrcmp(argv[i], "macro") == 0 ||
4944 Ustrcmp(argv[i], "environment") == 0))
4946 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4950 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4952 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4957 set_process_info("listing config");
4958 exim_exit(readconf_print(US"config", NULL, flag_n)
4959 ? EXIT_SUCCESS : EXIT_FAILURE);
4963 /* Initialise subsystems as required. */
4967 /* Handle a request to deliver one or more messages that are already on the
4968 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4969 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4971 Delivery of specific messages is typically used for a small number when
4972 prodding by hand (when the option forced_delivery will be set) or when
4973 re-execing to regain root privilege. Each message delivery must happen in a
4974 separate process, so we fork a process for each one, and run them sequentially
4975 so that debugging output doesn't get intertwined, and to avoid spawning too
4976 many processes if a long list is given. However, don't fork for the last one;
4977 this saves a process in the common case when Exim is called to deliver just one
4980 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4982 if (prod_requires_admin && !f.admin_user)
4984 fprintf(stderr, "exim: Permission denied\n");
4985 exim_exit(EXIT_FAILURE);
4987 set_process_info("delivering specified messages");
4988 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4989 for (i = msg_action_arg; i < argc; i++)
4993 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4994 that runs into a later copy into the untainted global message_id[] */
4995 /*XXX Do we need a length limit check here? */
4997 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4998 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
5000 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
5001 exim_underbar_exit(EXIT_SUCCESS);
5005 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
5007 exim_exit(EXIT_FAILURE);
5011 exim_exit(EXIT_SUCCESS);
5015 /* If only a single queue run is requested, without SMTP listening, we can just
5016 turn into a queue runner, with an optional starting message id. */
5018 if (is_onetime_qrun() && !f.daemon_listen)
5020 single_queue_run(qrunners, start_queue_run_id, stop_queue_run_id);
5021 exim_exit(EXIT_SUCCESS);
5025 /* Find the login name of the real user running this process. This is always
5026 needed when receiving a message, because it is written into the spool file. It
5027 may also be used to construct a from: or a sender: header, and in this case we
5028 need the user's full name as well, so save a copy of it, checked for RFC822
5029 syntax and munged if necessary, if it hasn't previously been set by the -F
5030 argument. We may try to get the passwd entry more than once, in case NIS or
5031 other delays are in evidence. Save the home directory for use in filter testing
5036 if ((pw = getpwuid(real_uid)) != NULL)
5038 originator_login = string_copy(US pw->pw_name);
5039 originator_home = string_copy(US pw->pw_dir);
5041 /* If user name has not been set by -F, set it from the passwd entry
5042 unless -f has been used to set the sender address by a trusted user. */
5044 if (!originator_name)
5046 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
5048 uschar *name = US pw->pw_gecos;
5049 uschar *amp = Ustrchr(name, '&');
5052 /* Most Unix specify that a '&' character in the gecos field is
5053 replaced by a copy of the login name, and some even specify that
5054 the first character should be upper cased, so that's what we do. */
5059 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
5060 (int)(amp - name), name, &loffset, originator_login, amp + 1);
5061 buffer[loffset] = toupper(buffer[loffset]);
5065 /* If a pattern for matching the gecos field was supplied, apply
5066 it and then expand the name string. */
5068 GET_OPTION("gecos_pattern");
5069 GET_OPTION("gecos_name");
5070 if (gecos_pattern && gecos_name)
5072 const pcre2_code *re;
5073 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5075 if (regex_match_and_setup(re, name, 0, -1))
5077 uschar *new_name = expand_string(gecos_name);
5081 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5082 "gecos field \"%s\"\n", new_name, name);
5085 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5086 "\"%s\": %s\n", gecos_name, expand_string_message);
5088 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5089 "gecos field \"%s\"\n", gecos_pattern, name);
5090 store_free((void *)re);
5092 originator_name = string_copy(name);
5095 /* A trusted caller has used -f but not -F */
5097 else originator_name = US"";
5100 /* Break the retry loop */
5105 if (++i > finduser_retries) break;
5109 /* If we cannot get a user login, log the incident and give up, unless the
5110 configuration specifies something to use. When running in the test harness,
5111 any setting of unknown_login overrides the actual name. */
5113 if (!originator_login || f.running_in_test_harness)
5115 GET_OPTION("unknown_login");
5118 originator_login = expand_string(unknown_login);
5119 if (!originator_name && unknown_username)
5120 originator_name = expand_string(unknown_username);
5121 if (!originator_name) originator_name = US"";
5123 if (!originator_login)
5124 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5128 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5131 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5133 /* If a message is created by this call of Exim, the uid/gid of its originator
5134 are those of the caller. These values are overridden if an existing message is
5135 read in from the spool. */
5137 originator_uid = real_uid;
5138 originator_gid = real_gid;
5140 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5141 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5143 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5144 returns. We leave this till here so that the originator_ fields are available
5145 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5148 if (f.daemon_listen || f.inetd_wait_mode || is_multiple_qrun())
5152 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5153 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5154 "mua_wrapper is set");
5157 # ifndef DISABLE_TLS
5158 /* This also checks that the library linkage is working and we can call
5159 routines in it, so call even if tls_require_ciphers is unset */
5161 # ifdef MEASURE_TIMING
5163 (void)gettimeofday(&t0, NULL);
5165 if (!tls_dropprivs_validate_require_cipher(FALSE))
5167 # ifdef MEASURE_TIMING
5168 report_time_since(&t0, US"validate_ciphers (delta)");
5176 /* If the sender ident has not been set (by a trusted caller) set it to
5177 the caller. This will get overwritten below for an inetd call. If a trusted
5178 caller has set it empty, unset it. */
5180 if (!sender_ident) sender_ident = originator_login;
5181 else if (!*sender_ident) sender_ident = NULL;
5183 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5184 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5185 originator_* variables set. */
5187 if (test_rewrite_arg >= 0)
5189 f.really_exim = FALSE;
5190 if (test_rewrite_arg >= argc)
5192 printf("-brw needs an address argument\n");
5193 exim_exit(EXIT_FAILURE);
5195 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5196 exim_exit(EXIT_SUCCESS);
5199 /* A locally-supplied message is considered to be coming from a local user
5200 unless a trusted caller supplies a sender address with -f, or is passing in the
5201 message via SMTP (inetd invocation or otherwise). */
5203 if ( !sender_address && !smtp_input
5204 || !f.trusted_caller && filter_test == FTEST_NONE)
5206 f.sender_local = TRUE;
5208 /* A trusted caller can supply authenticated_sender and authenticated_id
5209 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5210 defaults except when host checking. */
5212 if (!authenticated_sender && !host_checking)
5213 authenticated_sender = string_sprintf("%s@%s", originator_login,
5214 qualify_domain_sender);
5215 if (!authenticated_id && !host_checking)
5216 authenticated_id = originator_login;
5219 /* Trusted callers are always permitted to specify the sender address.
5220 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5221 is specified is the empty address. However, if a trusted caller does not
5222 specify a sender address for SMTP input, we leave sender_address unset. This
5223 causes the MAIL commands to be honoured. */
5225 if ( !smtp_input && !sender_address
5226 || !receive_check_set_sender(sender_address))
5228 /* Either the caller is not permitted to set a general sender, or this is
5229 non-SMTP input and the trusted caller has not set a sender. If there is no
5230 sender, or if a sender other than <> is set, override with the originator's
5231 login (which will get qualified below), except when checking things. */
5233 if ( !sender_address /* No sender_address set */
5235 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5236 !checking)) /* Not running tests, including filter tests */
5238 sender_address = originator_login;
5239 f.sender_address_forced = FALSE;
5240 sender_address_domain = 0;
5244 /* Remember whether an untrusted caller set the sender address */
5246 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5248 /* Ensure that the sender address is fully qualified unless it is the empty
5249 address, which indicates an error message, or doesn't exist (root caller, smtp
5250 interface, no -f argument). */
5252 if (sender_address && *sender_address && sender_address_domain == 0)
5253 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5254 qualify_domain_sender);
5256 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5258 /* Handle a request to verify a list of addresses, or test them for delivery.
5259 This must follow the setting of the sender address, since routers can be
5260 predicated upon the sender. If no arguments are given, read addresses from
5261 stdin. Set debug_level to at least D_v to get full output for address testing.
5264 if (verify_address_mode || f.address_test_mode)
5267 int flags = vopt_qualify;
5269 if (verify_address_mode)
5271 if (!verify_as_sender) flags |= vopt_is_recipient;
5272 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5277 flags |= vopt_is_recipient;
5278 debug_selector |= D_v;
5279 debug_file = stderr;
5280 debug_fd = fileno(debug_file);
5281 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5284 if (recipients_arg < argc)
5285 while (recipients_arg < argc)
5287 /* Supplied addresses are tainted since they come from a user */
5288 uschar * s = string_copy_taint(
5289 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5293 BOOL finished = FALSE;
5294 uschar *ss = parse_find_address_end(s, FALSE);
5295 if (*ss == ',') *ss = 0; else finished = TRUE;
5296 test_address(s, flags, &exit_value);
5299 while (*++s == ',' || isspace(*s)) ;
5305 uschar * s = get_stdinput(NULL, NULL);
5307 test_address(string_copy_taint(
5308 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5310 flags, &exit_value);
5314 exim_exit(exit_value);
5317 /* Handle expansion checking. Either expand items on the command line, or read
5318 from stdin if there aren't any. If -Mset was specified, load the message so
5319 that its variables can be used, but restrict this facility to admin users.
5320 Otherwise, if -bem was used, read a message from stdin. */
5324 dns_init(FALSE, FALSE, FALSE);
5325 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5329 exim_fail("exim: permission denied\n");
5330 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5331 /* Checking the length of the ID is sufficient to validate it.
5332 Get an untainted version so file opens can be done. */
5333 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5335 spoolname = string_sprintf("%s-H", message_id);
5336 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5337 printf ("Failed to load message datafile %s\n", message_id);
5338 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5339 printf ("Failed to load message %s\n", message_id);
5342 /* Read a test message from a file. We fudge it up to be on stdin, saving
5343 stdin itself for later reading of expansion strings. */
5345 else if (expansion_test_message)
5347 uschar * rme = expand_string(recipients_max);
5348 int save_stdin = dup(0);
5349 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5351 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5354 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5355 message_ended = END_NOTENDED;
5356 recipients_max_expanded = atoi(CCS rme);
5357 read_message_body(receive_msg(extract_recipients));
5358 message_linecount += body_linecount;
5359 (void)dup2(save_stdin, 0);
5360 (void)close(save_stdin);
5361 clearerr(stdin); /* Required by Darwin */
5364 /* Only admin users may see config-file macros this way */
5366 if (!f.admin_user) macros_user = macros = mlast = NULL;
5368 /* Allow $recipients for this testing */
5370 f.enable_dollar_recipients = TRUE;
5372 /* Expand command line items */
5374 if (recipients_arg < argc)
5375 while (recipients_arg < argc)
5376 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5382 char *(*fn_readline)(const char *) = NULL;
5383 void (*fn_addhist)(const char *) = NULL;
5387 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5390 while (s = get_stdinput(fn_readline, fn_addhist))
5391 expansion_test_line(s);
5394 if (dlhandle) dlclose(dlhandle);
5398 /* The data file will be open after -Mset */
5400 if (deliver_datafile >= 0)
5402 (void)close(deliver_datafile);
5403 deliver_datafile = -1;
5406 exim_exit(EXIT_SUCCESS);
5410 /* The active host name is normally the primary host name, but it can be varied
5411 for hosts that want to play several parts at once. We need to ensure that it is
5412 set for host checking, and for receiving messages. */
5414 smtp_active_hostname = primary_hostname;
5415 GET_OPTION("smtp_active_hostname");
5416 if (raw_active_hostname)
5418 uschar * nah = expand_string(raw_active_hostname);
5421 if (!f.expand_string_forcedfail)
5422 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5423 "(smtp_active_hostname): %s", raw_active_hostname,
5424 expand_string_message);
5426 else if (nah[0]) smtp_active_hostname = nah;
5429 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5430 given IP address so that the blocking and relay configuration can be tested.
5431 Unless a sender_ident was set by -oMt, we discard it (the default is the
5432 caller's login name). An RFC 1413 call is made only if we are running in the
5433 test harness and an incoming interface and both ports are specified, because
5434 there is no TCP/IP call to find the ident for. */
5441 if (!sender_ident_set)
5443 sender_ident = NULL;
5444 if (f.running_in_test_harness && sender_host_port
5445 && interface_address && interface_port)
5446 verify_get_ident(1223); /* note hardwired port number */
5449 /* In case the given address is a non-canonical IPv6 address, canonicalize
5450 it. The code works for both IPv4 and IPv6, as it happens. */
5452 size = host_aton(sender_host_address, x);
5453 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5454 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5456 /* Now set up for testing */
5458 host_build_sender_fullhost();
5462 f.sender_local = FALSE;
5463 f.sender_host_notsocket = TRUE;
5464 debug_file = stderr;
5465 debug_fd = fileno(debug_file);
5466 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5467 "**** but without any ident (RFC 1413) callback.\n"
5468 "**** This is not for real!\n\n",
5469 sender_host_address);
5471 connection_id = getpid();
5472 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5473 if (verify_check_host(&hosts_connection_nolog) == OK)
5475 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5476 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5478 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5480 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5481 because a log line has already been written for all its failure exists
5482 (usually "connection refused: <reason>") and writing another one is
5483 unnecessary clutter. */
5485 if (smtp_start_session())
5488 for (; (reset_point = store_mark()); store_reset(reset_point))
5490 if (smtp_setup_msg() <= 0) break;
5491 if (!receive_msg(FALSE)) break;
5493 return_path = sender_address = NULL;
5494 dnslist_domain = dnslist_matched = NULL;
5495 #ifndef DISABLE_DKIM
5496 dkim_cur_signer = NULL;
5499 deliver_localpart_orig = NULL;
5500 deliver_domain_orig = NULL;
5501 callout_address = sending_ip_address = NULL;
5502 deliver_localpart_data = deliver_domain_data =
5503 recipient_data = sender_data = NULL;
5504 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5508 exim_exit(EXIT_SUCCESS);
5512 /* Arrange for message reception if recipients or SMTP were specified;
5513 otherwise complain unless a version print (-bV) happened or this is a filter
5514 verification test or info dump.
5515 In the former case, show the configuration file name. */
5517 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5519 if (version_printed)
5521 if (Ustrchr(config_main_filelist, ':'))
5522 printf("Configuration file search path is %s\n", config_main_filelist);
5523 printf("Configuration file is %s\n", config_main_filename);
5524 return EXIT_SUCCESS;
5527 if (info_flag != CMDINFO_NONE)
5529 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5530 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5533 if (filter_test == FTEST_NONE)
5534 exim_usage(called_as);
5538 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5539 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5540 that we are not called from inetd, because that is rejected above. The
5541 following configuration settings are forced here:
5543 (1) Synchronous delivery (-odi)
5544 (2) Errors to stderr (-oep == -oeq)
5545 (3) No parallel remote delivery
5546 (4) Unprivileged delivery
5548 We don't force overall queueing options because there are several of them;
5549 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5550 to override any SMTP queueing. */
5554 f.synchronous_delivery = TRUE;
5555 arg_error_handling = ERRORS_STDERR;
5556 remote_max_parallel = 1;
5557 deliver_drop_privilege = TRUE;
5558 f.queue_smtp = FALSE;
5559 queue_smtp_domains = NULL;
5561 message_utf8_downconvert = -1; /* convert-if-needed */
5566 /* Prepare to accept one or more new messages on the standard input. When a
5567 message has been read, its id is returned in message_id[]. If doing immediate
5568 delivery, we fork a delivery process for each received message, except for the
5569 last one, where we can save a process switch.
5571 It is only in non-smtp mode that error_handling is allowed to be changed from
5572 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5573 sendmail error modes other than -oem ever actually used? Later: yes.) */
5575 if (!smtp_input) error_handling = arg_error_handling;
5577 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5578 logging being sent down the socket and make an identd call to get the
5581 else if (f.is_inetd)
5583 (void)fclose(stderr);
5584 exim_nullstd(); /* Re-open to /dev/null */
5585 verify_get_ident(IDENT_PORT);
5586 host_build_sender_fullhost();
5587 set_process_info("handling incoming connection from %s via inetd",
5591 /* If the sender host address has been set, build sender_fullhost if it hasn't
5592 already been done (which it will have been for inetd). This caters for the
5593 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5594 so that the test for IP options is skipped for -bs input. */
5596 if (sender_host_address && !sender_fullhost)
5598 host_build_sender_fullhost();
5599 set_process_info("handling incoming connection from %s via -oMa",
5601 f.sender_host_notsocket = TRUE;
5604 /* Otherwise, set the sender host as unknown except for inetd calls. This
5605 prevents host checking in the case of -bs not from inetd and also for -bS. */
5607 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5609 /* If stdout does not exist, then dup stdin to stdout. This can happen
5610 if exim is started from inetd. In this case fd 0 will be set to the socket,
5611 but fd 1 will not be set. This also happens for passed SMTP channels. */
5613 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5615 /* Set up the incoming protocol name and the state of the program. Root is
5616 allowed to force received protocol via the -oMr option above. If we have come
5617 via inetd, the process info has already been set up. We don't set
5618 received_protocol here for smtp input, as it varies according to
5619 batch/HELO/EHLO/AUTH/TLS. */
5623 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5624 smtp_batched_input? "batched " : "",
5625 sender_address ? sender_address : originator_login);
5629 int old_pool = store_pool;
5630 store_pool = POOL_PERM;
5631 if (!received_protocol)
5632 received_protocol = string_sprintf("local%s", called_as);
5633 store_pool = old_pool;
5634 set_process_info("accepting a local non-SMTP message from <%s>",
5638 /* Initialize the session_local_queue-only flag (this will be ignored if
5639 mua_wrapper is set) */
5642 session_local_queue_only = queue_only;
5644 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5645 the spool if so configured. On failure, we must not attempt to send an error
5646 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5647 error code is given.) */
5649 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5650 exim_fail("exim: insufficient disk space\n");
5652 /* If this is smtp input of any kind, real or batched, handle the start of the
5655 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5656 because a log line has already been written for all its failure exists
5657 (usually "connection refused: <reason>") and writing another one is
5658 unnecessary clutter. */
5660 connection_id = getpid();
5665 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5666 if (verify_check_host(&hosts_connection_nolog) == OK)
5668 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5669 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5671 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5672 if (!smtp_start_session())
5675 exim_exit(EXIT_SUCCESS);
5679 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5680 (we handle buferring so as to have visibility of fill level). */
5684 GET_OPTION("message_size_limit");
5685 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5686 if (expand_string_message)
5687 if (thismessage_size_limit == -1)
5688 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5689 "message_size_limit: %s", expand_string_message);
5691 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5692 "message_size_limit: %s", expand_string_message);
5694 setvbuf(stdin, NULL, _IONBF, 0);
5697 /* Loop for several messages when reading SMTP input. If we fork any child
5698 processes, we don't want to wait for them unless synchronous delivery is
5699 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5700 same as SIG_DFL, despite the fact that documentation often lists the default as
5701 "ignore". This is a confusing area. This is what I know:
5703 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5704 processes that complete simply to go away without ever becoming defunct. You
5705 can't then wait for them - but we don't want to wait for them in the
5706 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5707 happen for all OS (e.g. *BSD is different).
5709 But that's not the end of the story. Some (many? all?) systems have the
5710 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5711 has by default, so it seems that the difference is merely one of default
5712 (compare restarting vs non-restarting signals).
5714 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5715 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5716 of the loop below. Paranoia rules.
5718 February 2003: That's *still* not the end of the story. There are now versions
5719 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5720 process then calls waitpid(), a grumble is written to the system log, because
5721 this is logically inconsistent. In other words, it doesn't like the paranoia.
5722 As a consequence of this, the waitpid() below is now excluded if we are sure
5723 that SIG_IGN works. */
5725 if (!f.synchronous_delivery)
5728 struct sigaction act;
5729 act.sa_handler = SIG_IGN;
5730 sigemptyset(&(act.sa_mask));
5731 act.sa_flags = SA_NOCLDWAIT;
5732 sigaction(SIGCHLD, &act, NULL);
5734 signal(SIGCHLD, SIG_IGN);
5738 /* Save the current store pool point, for resetting at the start of
5739 each message, and save the real sender address, if any. */
5741 real_sender_address = sender_address;
5743 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5744 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5747 for (BOOL more = TRUE; more; )
5749 rmark reset_point = store_mark();
5752 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5753 input and build the recipients list, before calling receive_msg() to read the
5754 message proper. Whatever sender address is given in the SMTP transaction is
5755 often ignored for local senders - we use the actual sender, which is normally
5756 either the underlying user running this process or a -f argument provided by
5757 a trusted caller. It is saved in real_sender_address. The test for whether to
5758 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5763 if ((rc = smtp_setup_msg()) > 0)
5765 if ( real_sender_address
5766 && !receive_check_set_sender(sender_address))
5768 sender_address = raw_sender = real_sender_address;
5769 sender_address_unrewritten = NULL;
5772 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5773 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5774 the very end. The result of the ACL is ignored (as for other non-SMTP
5775 messages). It is run for its potential side effects. */
5777 if (smtp_batched_input)
5779 GET_OPTION("acl_not_smtp_start");
5780 if (acl_not_smtp_start)
5782 uschar * user_msg, * log_msg;
5783 f.enable_dollar_recipients = TRUE;
5784 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5785 &user_msg, &log_msg);
5786 f.enable_dollar_recipients = FALSE;
5790 /* Now get the data for the message */
5792 more = receive_msg(extract_recipients);
5795 cancel_cutthrough_connection(TRUE, US"receive dropped");
5796 if (more) goto MORELOOP;
5797 smtp_log_no_mail(); /* Log no mail if configured */
5798 exim_exit(EXIT_FAILURE);
5803 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5804 smtp_log_no_mail(); /* Log no mail if configured */
5805 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5809 /* In the non-SMTP case, we have all the information from the command
5810 line, but must process it in case it is in the more general RFC822
5811 format, and in any case, to detect syntax errors. Also, it appears that
5812 the use of comma-separated lists as single arguments is common, so we
5813 had better support them. */
5817 uschar * rme = expand_string(recipients_max);
5818 int rcount = 0, count = argc - recipients_arg;
5819 const uschar ** list = argv + recipients_arg;
5821 recipients_max_expanded = atoi(CCS rme);
5823 /* These options cannot be changed dynamically for non-SMTP messages */
5825 f.active_local_sender_retain = local_sender_retain;
5826 f.active_local_from_check = local_from_check;
5828 /* Save before any rewriting */
5830 raw_sender = string_copy(sender_address);
5832 /* Loop for each argument (supplied by user hence tainted) */
5834 for (int i = 0; i < count; i++)
5836 int start, end, domain;
5838 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5839 We'll still want to cap it to something, just in case. */
5840 uschar * s = string_copy_taint(
5841 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5844 /* Loop for each comma-separated address */
5848 BOOL finished = FALSE;
5850 uschar * ss = parse_find_address_end(s, FALSE);
5852 if (*ss == ',') *ss = 0; else finished = TRUE;
5854 /* Check max recipients - if -t was used, these aren't recipients */
5856 if ( recipients_max_expanded > 0 && ++rcount > recipients_max_expanded
5857 && !extract_recipients)
5859 DEBUG(D_all) debug_printf("excess reipients (max %d)\n",
5860 recipients_max_expanded);
5862 if (error_handling == ERRORS_STDERR)
5864 fprintf(stderr, "exim: too many recipients\n");
5865 exim_exit(EXIT_FAILURE);
5869 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5870 errors_sender_rc : EXIT_FAILURE;
5875 BOOL b = allow_utf8_domains;
5876 allow_utf8_domains = TRUE;
5879 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5883 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5884 else allow_utf8_domains = b;
5889 if (domain == 0 && !f.allow_unqualified_recipient)
5892 errmess = US"unqualified recipient address not allowed";
5897 DEBUG(D_all) debug_printf("bad recipient address \"%s\": %s\n",
5898 string_printing(list[i]), errmess);
5900 if (error_handling == ERRORS_STDERR)
5902 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5903 string_printing(list[i]), errmess);
5904 exim_exit(EXIT_FAILURE);
5910 eblock.text1 = string_printing(list[i]);
5911 eblock.text2 = errmess;
5913 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5914 errors_sender_rc : EXIT_FAILURE;
5918 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5921 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5925 /* Show the recipients when debugging */
5929 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5930 if (recipients_list)
5932 debug_printf("Recipients:\n");
5933 for (int i = 0; i < recipients_count; i++)
5934 debug_printf(" %s\n", recipients_list[i].address);
5938 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5939 ignored; rejecting here would just add complication, and it can just as
5940 well be done later. Allow $recipients to be visible in the ACL. */
5942 GET_OPTION("acl_not_smtp_start");
5943 if (acl_not_smtp_start)
5945 uschar * user_msg, * log_msg;
5946 f.enable_dollar_recipients = TRUE;
5947 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5948 &user_msg, &log_msg);
5949 f.enable_dollar_recipients = FALSE;
5952 /* Pause for a while waiting for input. If none received in that time,
5953 close the logfile, if we had one open; then if we wait for a long-running
5954 datasource (months, in one use-case) log rotation will not leave us holding
5957 if (!receive_timeout)
5958 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5961 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5962 will just read the headers for the message, and not write anything onto the
5965 message_ended = END_NOTENDED;
5966 more = receive_msg(extract_recipients);
5968 /* more is always FALSE here (not SMTP message) when reading a message
5969 for real; when reading the headers of a message for filter testing,
5970 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5972 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5973 } /* Non-SMTP message reception */
5975 /* If this is a filter testing run, there are headers in store, but
5976 no message on the spool. Run the filtering code in testing mode, setting
5977 the domain to the qualify domain and the local part to the current user,
5978 unless they have been set by options. The prefix and suffix are left unset
5979 unless specified. The the return path is set to to the sender unless it has
5980 already been set from a return-path header in the message. */
5982 if (filter_test != FTEST_NONE)
5984 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5985 deliver_domain_orig = deliver_domain;
5986 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5987 deliver_localpart_orig = deliver_localpart;
5988 deliver_localpart_prefix = US ftest_prefix;
5989 deliver_localpart_suffix = US ftest_suffix;
5990 deliver_home = originator_home;
5994 printf("Return-path copied from sender\n");
5995 return_path = string_copy(sender_address);
5998 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5999 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
6001 receive_add_recipient(
6002 string_sprintf("%s%s%s@%s",
6003 ftest_prefix ? ftest_prefix : US"",
6005 ftest_suffix ? ftest_suffix : US"",
6006 deliver_domain), -1);
6008 printf("Recipient = %s\n", recipients_list[0].address);
6009 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
6010 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
6012 if (chdir("/")) /* Get away from wherever the user is running this from */
6014 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
6015 exim_exit(EXIT_FAILURE);
6018 /* Now we run either a system filter test, or a user filter test, or both.
6019 In the latter case, headers added by the system filter will persist and be
6020 available to the user filter. We need to copy the filter variables
6023 if (filter_test & FTEST_SYSTEM)
6024 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
6025 exim_exit(EXIT_FAILURE);
6027 memcpy(filter_sn, filter_n, sizeof(filter_sn));
6029 if (filter_test & FTEST_USER)
6030 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
6031 exim_exit(EXIT_FAILURE);
6033 exim_exit(EXIT_SUCCESS);
6036 /* Else act on the result of message reception. We should not get here unless
6037 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
6038 will be TRUE. If it is not, check on the number of messages received in this
6041 if ( !session_local_queue_only
6042 && smtp_accept_queue_per_connection > 0
6043 && receive_messagecount > smtp_accept_queue_per_connection)
6045 session_local_queue_only = TRUE;
6046 queue_only_reason = 2;
6049 /* Initialize local_queue_only from session_local_queue_only. If it is false,
6050 and queue_only_load is set, check that the load average is below it. If it is
6051 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
6052 default), we put the whole session into queue_only mode. It then remains this
6053 way for any subsequent messages on the same SMTP connection. This is a
6054 deliberate choice; even though the load average may fall, it doesn't seem
6055 right to deliver later messages on the same call when not delivering earlier
6056 ones. However, there are odd cases where this is not wanted, so this can be
6057 changed by setting queue_only_load_latch false. */
6059 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
6060 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
6062 queue_only_reason = 3;
6063 if (queue_only_load_latch) session_local_queue_only = TRUE;
6066 /* If running as an MUA wrapper, all queueing options and freezing options
6070 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
6072 /* Log the queueing here, when it will get a message id attached, but
6073 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
6076 if (local_queue_only)
6078 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6079 switch(queue_only_reason)
6082 log_write(L_delay_delivery,
6083 LOG_MAIN, "no immediate delivery: more than %d messages "
6084 "received in one connection", smtp_accept_queue_per_connection);
6088 log_write(L_delay_delivery,
6089 LOG_MAIN, "no immediate delivery: load average %.2f",
6090 (double)load_average/1000.0);
6095 else if (f.queue_only_policy || f.deliver_freeze)
6096 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6098 /* Else do the delivery unless the ACL or local_scan() called for queue only
6099 or froze the message. Always deliver in a separate process. A fork failure is
6100 not a disaster, as the delivery will eventually happen on a subsequent queue
6101 run. The search cache must be tidied before the fork, as the parent will
6102 do it before exiting. The child will trigger a lookup failure and
6103 thereby defer the delivery if it tries to use (for example) a cached ldap
6104 connection that the parent has called unbind on. */
6111 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6114 close_unwanted(); /* Close unwanted file descriptors and TLS */
6115 exim_nullstd(); /* Ensure std{in,out,err} exist */
6117 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6118 mode, deliver_drop_privilege is forced TRUE). */
6120 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6122 delivery_re_exec(CEE_EXEC_EXIT);
6123 /* Control does not return here. */
6126 /* No need to re-exec */
6128 rc = deliver_message(message_id, FALSE, FALSE);
6130 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6131 ? EXIT_SUCCESS : EXIT_FAILURE);
6136 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6137 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6138 "process: %s", strerror(errno));
6142 release_cutthrough_connection(US"msg passed for delivery");
6144 /* In the parent, wait if synchronous delivery is required. This will
6145 always be the case in MUA wrapper mode. */
6147 if (f.synchronous_delivery)
6150 while (wait(&status) != pid);
6151 if ((status & 0x00ff) != 0)
6152 log_write(0, LOG_MAIN|LOG_PANIC,
6153 "process %d crashed with signal %d while delivering %s",
6154 (int)pid, status & 0x00ff, message_id);
6155 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6160 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6161 automatically reaps children (see comments above the loop), clear away any
6162 finished subprocesses here, in case there are lots of messages coming in
6163 from the same source. */
6165 #ifndef SIG_IGN_WORKS
6166 while (waitpid(-1, NULL, WNOHANG) > 0);
6170 return_path = sender_address = NULL;
6171 authenticated_sender = NULL;
6172 deliver_localpart_orig = NULL;
6173 deliver_domain_orig = NULL;
6174 deliver_host = deliver_host_address = NULL;
6175 dnslist_domain = dnslist_matched = NULL;
6176 #ifdef WITH_CONTENT_SCAN
6177 malware_name = NULL;
6180 callout_address = NULL;
6181 sending_ip_address = NULL;
6182 deliver_localpart_data = deliver_domain_data =
6183 recipient_data = sender_data = NULL;
6185 lookup_value = NULL; /* Can be set by ACL */
6187 store_reset(reset_point);
6190 exim_exit(EXIT_SUCCESS); /* Never returns */
6191 return 0; /* To stop compiler warning */