1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 - 2021 */
7 /* See the file NOTICE for conditions of use and distribution. */
10 /* The main function: entry point, initialization, and high-level control.
11 Also a few functions that don't naturally fit elsewhere. */
16 #if defined(__GLIBC__) && !defined(__UCLIBC__)
17 # include <gnu/libc-version.h>
21 # include <gnutls/gnutls.h>
22 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
31 extern void init_lookup_list(void);
35 /*************************************************
36 * Function interface to store functions *
37 *************************************************/
39 /* We need some real functions to pass to the PCRE regular expression library
40 for store allocation via Exim's store manager. The normal calls are actually
41 macros that pass over location information to make tracing easier. These
42 functions just interface to the standard macro calls. A good compiler will
43 optimize out the tail recursion and so not make them too expensive. */
46 function_store_malloc(PCRE2_SIZE size, void * tag)
48 return store_malloc((int)size);
52 function_store_free(void * block, void * tag)
54 /* At least some version of pcre2 pass a null pointer */
55 if (block) store_free(block);
61 /*************************************************
62 * Enums for cmdline interface *
63 *************************************************/
65 enum commandline_info { CMDINFO_NONE=0,
66 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
71 /*************************************************
72 * Compile regular expression and panic on fail *
73 *************************************************/
75 /* This function is called when failure to compile a regular expression leads
76 to a panic exit. In other cases, pcre_compile() is called directly. In many
77 cases where this function is used, the results of the compilation are to be
78 placed in long-lived store, so we temporarily reset the store management
79 functions that PCRE uses if the use_malloc flag is set.
82 pattern the pattern to compile
83 caseless TRUE if caseless matching is required
84 use_malloc TRUE if compile into malloc store
86 Returns: pointer to the compiled pattern
90 regex_must_compile(const uschar * pattern, BOOL caseless, BOOL use_malloc)
93 int options = caseless ? PCRE_COPT|PCRE2_CASELESS : PCRE_COPT;
94 const pcre2_code * yield;
96 pcre2_general_context * gctx;
97 pcre2_compile_context * cctx;
101 gctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
102 cctx = pcre2_compile_context_create(gctx);
107 if (!(yield = pcre2_compile((PCRE2_SPTR)pattern, PCRE2_ZERO_TERMINATED, options,
108 &err, &offset, cctx)))
111 pcre2_get_error_message(err, errbuf, sizeof(errbuf));
112 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
113 "%s at offset %ld while compiling %s", errbuf, (long)offset, pattern);
118 pcre2_compile_context_free(cctx);
119 pcre2_general_context_free(gctx);
128 pcre_gen_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
129 pcre_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
130 pcre_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
136 /*************************************************
137 * Execute regular expression and set strings *
138 *************************************************/
140 /* This function runs a regular expression match, and sets up the pointers to
141 the matched substrings. The matched strings are copied so the lifetime of
142 the subject is not a problem.
145 re the compiled expression
146 subject the subject string
147 options additional PCRE options
148 setup if < 0 do full setup
149 if >= 0 setup from setup+1 onwards,
150 excluding the full matched string
152 Returns: TRUE if matched, or FALSE
156 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
158 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
159 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
160 PCRE_EOPT | options, md, pcre_mtc_ctx);
163 if ((yield = (res >= 0)))
165 res = pcre2_get_ovector_count(md);
166 expand_nmax = setup < 0 ? 0 : setup + 1;
167 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
170 pcre2_substring_get_bynumber(md, matchnum,
171 (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
172 expand_nlength[expand_nmax++] = (int)len;
176 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
179 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
180 debug_printf_indent("pcre2: %s\n", errbuf);
182 pcre2_match_data_free(md);
187 /* Check just for match with regex. Uses the common memory-handling.
191 subject string to be checked
192 slen length of subject; -1 for nul-terminated
193 rptr pointer for matched string, copied, or NULL
195 Return: TRUE for a match.
199 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
201 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
202 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
203 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
204 0, PCRE_EOPT, md, pcre_mtc_ctx);
205 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
209 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
215 /*************************************************
216 * Set up processing details *
217 *************************************************/
219 /* Save a text string for dumping when SIGUSR1 is received.
220 Do checks for overruns.
222 Arguments: format and arguments, as for printf()
227 set_process_info(const char *format, ...)
229 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
234 g = string_fmt_append(&gs, "%5d ", (int)getpid());
236 va_start(ap, format);
237 if (!string_vformat(g, 0, format, ap))
240 g = string_cat(&gs, US"**** string overflowed buffer ****");
242 g = string_catn(g, US"\n", 1);
243 string_from_gstring(g);
244 process_info_len = g->ptr;
245 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
249 /***********************************************
250 * Handler for SIGTERM *
251 ***********************************************/
254 term_handler(int sig)
260 /***********************************************
261 * Handler for SIGSEGV *
262 ***********************************************/
266 segv_handler(int sig, siginfo_t * info, void * uctx)
268 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
269 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
270 switch (info->si_code)
272 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
273 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
274 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
275 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
278 if (US info->si_addr < US 4096)
279 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
281 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
282 if (process_info_len > 0)
283 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
284 signal(SIGSEGV, SIG_DFL);
289 segv_handler(int sig)
291 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
292 if (process_info_len > 0)
293 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
294 signal(SIGSEGV, SIG_DFL);
300 /*************************************************
301 * Handler for SIGUSR1 *
302 *************************************************/
304 /* SIGUSR1 causes any exim process to write to the process log details of
305 what it is currently doing. It will only be used if the OS is capable of
306 setting up a handler that causes automatic restarting of any system call
307 that is in progress at the time.
309 This function takes care to be signal-safe.
311 Argument: the signal number (SIGUSR1)
316 usr1_handler(int sig)
320 os_restarting_signal(sig, usr1_handler);
322 if (!process_log_path) return;
323 fd = log_open_as_exim(process_log_path);
325 /* If we are neither exim nor root, or if we failed to create the log file,
326 give up. There is not much useful we can do with errors, since we don't want
327 to disrupt whatever is going on outside the signal handler. */
331 (void)write(fd, process_info, process_info_len);
337 /*************************************************
339 *************************************************/
341 /* This handler is enabled most of the time that Exim is running. The handler
342 doesn't actually get used unless alarm() has been called to set a timer, to
343 place a time limit on a system call of some kind. When the handler is run, it
346 There are some other SIGALRM handlers that are used in special cases when more
347 than just a flag setting is required; for example, when reading a message's
348 input. These are normally set up in the code module that uses them, and the
349 SIGALRM handler is reset to this one afterwards.
351 Argument: the signal value (SIGALRM)
356 sigalrm_handler(int sig)
359 os_non_restarting_signal(SIGALRM, sigalrm_handler);
364 /*************************************************
365 * Sleep for a fractional time interval *
366 *************************************************/
368 /* This function is called by millisleep() and exim_wait_tick() to wait for a
369 period of time that may include a fraction of a second. The coding is somewhat
370 tedious. We do not expect setitimer() ever to fail, but if it does, the process
371 will wait for ever, so we panic in this instance. (There was a case of this
372 when a bug in a function that calls milliwait() caused it to pass invalid data.
373 That's when I added the check. :-)
375 We assume it to be not worth sleeping for under 50us; this value will
376 require revisiting as hardware advances. This avoids the issue of
377 a zero-valued timer setting meaning "never fire".
379 Argument: an itimerval structure containing the interval
384 milliwait(struct itimerval *itval)
387 sigset_t old_sigmask;
388 int save_errno = errno;
390 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
392 (void)sigemptyset(&sigmask); /* Empty mask */
393 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
394 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
395 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
396 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
397 "setitimer() failed: %s", strerror(errno));
398 (void)sigfillset(&sigmask); /* All signals */
399 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
400 (void)sigsuspend(&sigmask); /* Until SIGALRM */
401 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
403 sigalrm_seen = FALSE;
409 /*************************************************
410 * Millisecond sleep function *
411 *************************************************/
413 /* The basic sleep() function has a granularity of 1 second, which is too rough
414 in some cases - for example, when using an increasing delay to slow down
417 Argument: number of millseconds
424 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
425 .it_value = {.tv_sec = msec/1000,
426 .tv_usec = (msec % 1000) * 1000}};
432 /*************************************************
433 * Compare microsecond times *
434 *************************************************/
441 Returns: -1, 0, or +1
445 exim_tvcmp(struct timeval *t1, struct timeval *t2)
447 if (t1->tv_sec > t2->tv_sec) return +1;
448 if (t1->tv_sec < t2->tv_sec) return -1;
449 if (t1->tv_usec > t2->tv_usec) return +1;
450 if (t1->tv_usec < t2->tv_usec) return -1;
457 /*************************************************
458 * Clock tick wait function *
459 *************************************************/
461 #ifdef _POSIX_MONOTONIC_CLOCK
462 # ifdef CLOCK_BOOTTIME
463 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
465 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
468 /* Amount EXIM_CLOCK is behind realtime, at startup. */
469 static struct timespec offset_ts;
472 exim_clock_init(void)
475 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
476 (void)gettimeofday(&tv, NULL);
477 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
478 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
479 if (offset_ts.tv_nsec >= 0) return;
481 offset_ts.tv_nsec += 1000*1000*1000;
487 exim_gettime(struct timeval * tv)
489 #ifdef _POSIX_MONOTONIC_CLOCK
490 struct timespec now_ts;
492 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
494 now_ts.tv_sec += offset_ts.tv_sec;
495 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
498 now_ts.tv_nsec -= 1000*1000*1000;
500 tv->tv_sec = now_ts.tv_sec;
501 tv->tv_usec = now_ts.tv_nsec / 1000;
505 (void)gettimeofday(tv, NULL);
509 /* Exim uses a time + a pid to generate a unique identifier in two places: its
510 message IDs, and in file names for maildir deliveries. Because some OS now
511 re-use pids within the same second, sub-second times are now being used.
512 However, for absolute certainty, we must ensure the clock has ticked before
513 allowing the relevant process to complete. At the time of implementation of
514 this code (February 2003), the speed of processors is such that the clock will
515 invariably have ticked already by the time a process has done its job. This
516 function prepares for the time when things are faster - and it also copes with
517 clocks that go backwards.
520 prev_tv A timeval which was used to create uniqueness; its usec field
521 has been rounded down to the value of the resolution.
522 We want to be sure the current time is greater than this.
523 On return, updated to current (rounded down).
524 resolution The resolution that was used to divide the microseconds
525 (1 for maildir, larger for message ids)
531 exim_wait_tick(struct timeval * prev_tv, int resolution)
533 struct timeval now_tv;
534 long int now_true_usec;
536 exim_gettime(&now_tv);
537 now_true_usec = now_tv.tv_usec;
538 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
540 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
542 struct itimerval itval;
543 itval.it_interval.tv_sec = 0;
544 itval.it_interval.tv_usec = 0;
545 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
546 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
548 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
549 negative value for the microseconds is possible only in the case when "now"
550 is more than a second less than "tgt". That means that itval.it_value.tv_sec
551 is greater than zero. The following correction is therefore safe. */
553 if (itval.it_value.tv_usec < 0)
555 itval.it_value.tv_usec += 1000000;
556 itval.it_value.tv_sec -= 1;
559 DEBUG(D_transport|D_receive)
561 if (!f.running_in_test_harness)
563 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
564 prev_tv->tv_sec, (long) prev_tv->tv_usec,
565 now_tv.tv_sec, (long) now_tv.tv_usec);
566 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
567 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
573 /* Be prapared to go around if the kernel does not implement subtick
574 granularity (GNU Hurd) */
576 exim_gettime(&now_tv);
577 now_true_usec = now_tv.tv_usec;
578 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
586 /*************************************************
587 * Call fopen() with umask 777 and adjust mode *
588 *************************************************/
590 /* Exim runs with umask(0) so that files created with open() have the mode that
591 is specified in the open() call. However, there are some files, typically in
592 the spool directory, that are created with fopen(). They end up world-writeable
593 if no precautions are taken. Although the spool directory is not accessible to
594 the world, this is an untidiness. So this is a wrapper function for fopen()
595 that sorts out the mode of the created file.
598 filename the file name
599 options the fopen() options
600 mode the required mode
602 Returns: the fopened FILE or NULL
606 modefopen(const uschar *filename, const char *options, mode_t mode)
608 mode_t saved_umask = umask(0777);
609 FILE *f = Ufopen(filename, options);
610 (void)umask(saved_umask);
611 if (f != NULL) (void)fchmod(fileno(f), mode);
616 /*************************************************
617 * Ensure stdin, stdout, and stderr exist *
618 *************************************************/
620 /* Some operating systems grumble if an exec() happens without a standard
621 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
622 file will be opened and will use these fd values, and then some other bit of
623 code will assume, for example, that it can write error messages to stderr.
624 This function ensures that fds 0, 1, and 2 are open if they do not already
625 exist, by connecting them to /dev/null.
627 This function is also used to ensure that std{in,out,err} exist at all times,
628 so that if any library that Exim calls tries to use them, it doesn't crash.
639 for (int i = 0; i <= 2; i++)
641 if (fstat(i, &statbuf) < 0 && errno == EBADF)
643 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
644 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
645 string_open_failed("/dev/null", NULL));
646 if (devnull != i) (void)dup2(devnull, i);
649 if (devnull > 2) (void)close(devnull);
655 /*************************************************
656 * Close unwanted file descriptors for delivery *
657 *************************************************/
659 /* This function is called from a new process that has been forked to deliver
660 an incoming message, either directly, or using exec.
662 We want any smtp input streams to be closed in this new process. However, it
663 has been observed that using fclose() here causes trouble. When reading in -bS
664 input, duplicate copies of messages have been seen. The files will be sharing a
665 file pointer with the parent process, and it seems that fclose() (at least on
666 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
667 least sometimes. Hence we go for closing the underlying file descriptors.
669 If TLS is active, we want to shut down the TLS library, but without molesting
670 the parent's SSL connection.
672 For delivery of a non-SMTP message, we want to close stdin and stdout (and
673 stderr unless debugging) because the calling process might have set them up as
674 pipes and be waiting for them to close before it waits for the submission
675 process to terminate. If they aren't closed, they hold up the calling process
676 until the initial delivery process finishes, which is not what we want.
678 Exception: We do want it for synchronous delivery!
680 And notwithstanding all the above, if D_resolver is set, implying resolver
681 debugging, leave stdout open, because that's where the resolver writes its
684 When we close stderr (which implies we've also closed stdout), we also get rid
685 of any controlling terminal.
697 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
699 (void)close(fileno(smtp_in));
700 (void)close(fileno(smtp_out));
705 (void)close(0); /* stdin */
706 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
707 if (debug_selector == 0) /* stderr */
709 if (!f.synchronous_delivery)
722 /*************************************************
724 *************************************************/
726 /* This function sets a new uid and gid permanently, optionally calling
727 initgroups() to set auxiliary groups. There are some special cases when running
728 Exim in unprivileged modes. In these situations the effective uid will not be
729 root; if we already have the right effective uid/gid, and don't need to
730 initialize any groups, leave things as they are.
735 igflag TRUE if initgroups() wanted
736 msg text to use in debugging output and failure log
738 Returns: nothing; bombs out on failure
742 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
744 uid_t euid = geteuid();
745 gid_t egid = getegid();
747 if (euid == root_uid || euid != uid || egid != gid || igflag)
749 /* At least one OS returns +1 for initgroups failure, so just check for
754 struct passwd *pw = getpwuid(uid);
756 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
757 "no passwd entry for uid=%ld", (long int)uid);
759 if (initgroups(pw->pw_name, gid) != 0)
760 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
761 (long int)uid, strerror(errno));
764 if (setgid(gid) < 0 || setuid(uid) < 0)
765 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
766 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
769 /* Debugging output included uid/gid and all groups */
773 int group_count, save_errno;
774 gid_t group_list[EXIM_GROUPLIST_SIZE];
775 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
776 (long int)geteuid(), (long int)getegid(), (long int)getpid());
777 group_count = getgroups(nelem(group_list), group_list);
779 debug_printf(" auxiliary group list:");
781 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
782 else if (group_count < 0)
783 debug_printf(" <error: %s>", strerror(save_errno));
784 else debug_printf(" <none>");
792 /*************************************************
794 *************************************************/
796 /* Exim exits via this function so that it always clears up any open
802 Returns: does not return
811 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
812 ">>>>>>>>>>>>>>>>\n",
813 (int)getpid(), process_purpose, rc);
819 exim_underbar_exit(int rc)
823 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
824 ">>>>>>>>>>>>>>>>\n",
825 (int)getpid(), process_purpose, rc);
831 /* Print error string, then die */
833 exim_fail(const char * fmt, ...)
837 vfprintf(stderr, fmt, ap);
841 /* fail if a length is too long */
843 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
845 if (itemlen <= maxlen)
847 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
848 itemlen, maxlen, description);
852 /* only pass through the string item back to the caller if it's short enough */
853 static inline const uschar *
854 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
856 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
860 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
861 of chown()/fchown(). See src/functions.h for more explanation */
863 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
865 int saved_errno = errno; /* from the preceeding chown call */
867 log_write(0, LOG_MAIN|LOG_PANIC,
868 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
869 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
870 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
872 /* I leave this here, commented, in case the "bug"(?) comes up again.
873 It is not an Exim bug, but we can provide a workaround.
879 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
881 if (buf.st_uid == owner && buf.st_gid == group) return 0;
882 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
884 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
892 /*************************************************
893 * Extract port from host address *
894 *************************************************/
896 /* Called to extract the port from the values given to -oMa and -oMi.
897 It also checks the syntax of the address, and terminates it before the
898 port data when a port is extracted.
901 address the address, with possible port on the end
903 Returns: the port, or zero if there isn't one
904 bombs out on a syntax error
908 check_port(uschar *address)
910 int port = host_address_extract_port(address);
911 if (string_is_ip_address(address, NULL) == 0)
912 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
918 /*************************************************
919 * Test/verify an address *
920 *************************************************/
922 /* This function is called by the -bv and -bt code. It extracts a working
923 address from a full RFC 822 address. This isn't really necessary per se, but it
924 has the effect of collapsing source routes.
928 flags flag bits for verify_address()
929 exit_value to be set for failures
935 test_address(uschar *s, int flags, int *exit_value)
937 int start, end, domain;
938 uschar *parse_error = NULL;
939 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
943 fprintf(stdout, "syntax error: %s\n", parse_error);
948 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
949 -1, -1, NULL, NULL, NULL);
950 if (rc == FAIL) *exit_value = 2;
951 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
957 /*************************************************
958 * Show supported features *
959 *************************************************/
962 show_string(BOOL is_stdout, gstring * g)
964 const uschar * s = string_from_gstring(g);
966 if (is_stdout) fputs(CCS s, stdout);
967 else debug_printf("%s", s);
972 show_db_version(gstring * g)
974 #ifdef DB_VERSION_STRING
977 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
978 g = string_fmt_append(g, " Runtime: %s\n",
979 db_version(NULL, NULL, NULL));
982 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
984 #elif defined(BTREEVERSION) && defined(HASHVERSION)
986 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
988 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
991 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
992 g = string_cat(g, US"Probably ndbm\n");
993 #elif defined(USE_TDB)
994 g = string_cat(g, US"Using tdb\n");
997 g = string_cat(g, US"Probably GDBM (native mode)\n");
999 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1006 /* This function is called for -bV/--version and for -d to output the optional
1007 features of the current Exim binary.
1009 Arguments: BOOL, true for stdout else debug channel
1014 show_whats_supported(BOOL is_stdout)
1016 rmark reset_point = store_mark();
1019 DEBUG(D_any) {} else g = show_db_version(g);
1021 g = string_cat(g, US"Support for:");
1022 #ifdef SUPPORT_CRYPTEQ
1023 g = string_cat(g, US" crypteq");
1026 g = string_cat(g, US" iconv()");
1029 g = string_cat(g, US" IPv6");
1031 #ifdef HAVE_SETCLASSRESOURCES
1032 g = string_cat(g, US" use_setclassresources");
1035 g = string_cat(g, US" PAM");
1038 g = string_cat(g, US" Perl");
1040 #ifdef EXPAND_DLFUNC
1041 g = string_cat(g, US" Expand_dlfunc");
1043 #ifdef USE_TCP_WRAPPERS
1044 g = string_cat(g, US" TCPwrappers");
1047 g = string_cat(g, US" GnuTLS");
1050 g = string_cat(g, US" OpenSSL");
1052 #ifndef DISABLE_TLS_RESUME
1053 g = string_cat(g, US" TLS_resume");
1055 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1056 g = string_cat(g, US" translate_ip_address");
1058 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1059 g = string_cat(g, US" move_frozen_messages");
1061 #ifdef WITH_CONTENT_SCAN
1062 g = string_cat(g, US" Content_Scanning");
1065 g = string_cat(g, US" DANE");
1067 #ifndef DISABLE_DKIM
1068 g = string_cat(g, US" DKIM");
1070 #ifdef SUPPORT_DMARC
1071 g = string_cat(g, US" DMARC");
1073 #ifndef DISABLE_DNSSEC
1074 g = string_cat(g, US" DNSSEC");
1076 #ifndef DISABLE_EVENT
1077 g = string_cat(g, US" Event");
1080 g = string_cat(g, US" I18N");
1082 #ifndef DISABLE_OCSP
1083 g = string_cat(g, US" OCSP");
1085 #ifndef DISABLE_PIPE_CONNECT
1086 g = string_cat(g, US" PIPECONNECT");
1088 #ifndef DISABLE_PRDR
1089 g = string_cat(g, US" PRDR");
1091 #ifdef SUPPORT_PROXY
1092 g = string_cat(g, US" PROXY");
1094 #ifndef DISABLE_QUEUE_RAMP
1095 g = string_cat(g, US" Queue_Ramp");
1097 #ifdef SUPPORT_SOCKS
1098 g = string_cat(g, US" SOCKS");
1101 g = string_cat(g, US" SPF");
1103 #if defined(SUPPORT_SRS)
1104 g = string_cat(g, US" SRS");
1108 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1110 #ifdef EXPERIMENTAL_ARC
1111 g = string_cat(g, US" Experimental_ARC");
1113 #ifdef EXPERIMENTAL_BRIGHTMAIL
1114 g = string_cat(g, US" Experimental_Brightmail");
1116 #ifdef EXPERIMENTAL_DCC
1117 g = string_cat(g, US" Experimental_DCC");
1119 #ifdef EXPERIMENTAL_DSN_INFO
1120 g = string_cat(g, US" Experimental_DSN_info");
1122 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1123 g = string_cat(g, US" Experimental_ESMTP_Limits");
1125 #ifdef EXPERIMENTAL_QUEUEFILE
1126 g = string_cat(g, US" Experimental_QUEUEFILE");
1128 g = string_cat(g, US"\n");
1130 g = string_cat(g, US"Lookups (built-in):");
1131 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1132 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1134 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1135 g = string_cat(g, US" cdb");
1137 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1138 g = string_cat(g, US" dbm dbmjz dbmnz");
1140 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1141 g = string_cat(g, US" dnsdb");
1143 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1144 g = string_cat(g, US" dsearch");
1146 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1147 g = string_cat(g, US" ibase");
1149 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1150 g = string_cat(g, US" json");
1152 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1153 g = string_cat(g, US" ldap ldapdn ldapm");
1156 g = string_cat(g, US" lmdb");
1158 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1159 g = string_cat(g, US" mysql");
1161 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1162 g = string_cat(g, US" nis nis0");
1164 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1165 g = string_cat(g, US" nisplus");
1167 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1168 g = string_cat(g, US" oracle");
1170 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1171 g = string_cat(g, US" passwd");
1173 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1174 g = string_cat(g, US" pgsql");
1176 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1177 g = string_cat(g, US" redis");
1179 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1180 g = string_cat(g, US" sqlite");
1182 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1183 g = string_cat(g, US" testdb");
1185 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1186 g = string_cat(g, US" whoson");
1188 g = string_cat(g, US"\n");
1190 g = auth_show_supported(g);
1191 g = route_show_supported(g);
1192 g = transport_show_supported(g);
1194 #ifdef WITH_CONTENT_SCAN
1195 g = malware_show_supported(g);
1197 show_string(is_stdout, g); g = NULL;
1199 if (fixed_never_users[0] > 0)
1202 g = string_cat(g, US"Fixed never_users: ");
1203 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1204 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1205 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1208 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1210 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1212 /* Everything else is details which are only worth reporting when debugging.
1213 Perhaps the tls_version_report should move into this too. */
1217 /* clang defines __GNUC__ (at least, for me) so test for it first */
1218 #if defined(__clang__)
1219 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1220 #elif defined(__GNUC__)
1221 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1225 "? unknown version ?"
1229 g = string_cat(g, US"Compiler: <unknown>\n");
1232 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1233 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1234 __GLIBC__, __GLIBC_MINOR__);
1235 if (__GLIBC_PREREQ(2, 1))
1236 g = string_fmt_append(g, " Runtime: %s\n",
1237 gnu_get_libc_version());
1240 g = show_db_version(g);
1243 g = tls_version_report(g);
1246 g = utf8_version_report(g);
1248 #ifdef SUPPORT_DMARC
1249 g = dmarc_version_report(g);
1252 g = spf_lib_version_report(g);
1255 show_string(is_stdout, g);
1258 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1259 if (authi->version_report)
1260 g = (*authi->version_report)(g);
1262 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1263 characters; unless it's an ancient version of PCRE in which case it
1265 #ifndef PCRE_PRERELEASE
1266 # define PCRE_PRERELEASE
1269 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1272 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1273 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1275 PCRE2_MAJOR, PCRE2_MINOR,
1276 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1280 #undef EXPAND_AND_QUOTE
1282 show_string(is_stdout, g);
1286 for (int i = 0; i < lookup_list_count; i++)
1287 if (lookup_list[i]->version_report)
1288 g = lookup_list[i]->version_report(g);
1289 show_string(is_stdout, g);
1292 #ifdef WHITELIST_D_MACROS
1293 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1295 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1297 #ifdef TRUSTED_CONFIG_LIST
1298 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1300 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1304 show_string(is_stdout, g);
1305 store_reset(reset_point);
1309 /*************************************************
1310 * Show auxiliary information about Exim *
1311 *************************************************/
1314 show_exim_information(enum commandline_info request, FILE *stream)
1319 fprintf(stream, "Oops, something went wrong.\n");
1323 "The -bI: flag takes a string indicating which information to provide.\n"
1324 "If the string is not recognised, you'll get this help (on stderr).\n"
1326 " exim -bI:help this information\n"
1327 " exim -bI:dscp list of known dscp value keywords\n"
1328 " exim -bI:sieve list of supported sieve extensions\n"
1332 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1333 fprintf(stream, "%s\n", *pp);
1336 dscp_list_to_stream(stream);
1342 /*************************************************
1343 * Quote a local part *
1344 *************************************************/
1346 /* This function is used when a sender address or a From: or Sender: header
1347 line is being created from the caller's login, or from an authenticated_id. It
1348 applies appropriate quoting rules for a local part.
1350 Argument: the local part
1351 Returns: the local part, quoted if necessary
1355 local_part_quote(uschar *lpart)
1357 BOOL needs_quote = FALSE;
1360 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1362 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1363 (*t != '.' || t == lpart || t[1] == 0);
1366 if (!needs_quote) return lpart;
1368 g = string_catn(NULL, US"\"", 1);
1372 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1375 g = string_cat(g, lpart);
1378 g = string_catn(g, lpart, nq - lpart);
1379 g = string_catn(g, US"\\", 1);
1380 g = string_catn(g, nq, 1);
1384 g = string_catn(g, US"\"", 1);
1385 return string_from_gstring(g);
1391 /*************************************************
1392 * Load readline() functions *
1393 *************************************************/
1395 /* This function is called from testing executions that read data from stdin,
1396 but only when running as the calling user. Currently, only -be does this. The
1397 function loads the readline() function library and passes back the functions.
1398 On some systems, it needs the curses library, so load that too, but try without
1399 it if loading fails. All this functionality has to be requested at build time.
1402 fn_readline_ptr pointer to where to put the readline pointer
1403 fn_addhist_ptr pointer to where to put the addhistory function
1405 Returns: the dlopen handle or NULL on failure
1409 set_readline(char * (**fn_readline_ptr)(const char *),
1410 void (**fn_addhist_ptr)(const char *))
1413 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1415 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1416 if (dlhandle_curses) dlclose(dlhandle_curses);
1420 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1421 * char * readline (const char *prompt);
1422 * void add_history (const char *string);
1424 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1425 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1428 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1436 /*************************************************
1437 * Get a line from stdin for testing things *
1438 *************************************************/
1440 /* This function is called when running tests that can take a number of lines
1441 of input (for example, -be and -bt). It handles continuations and trailing
1442 spaces. And prompting and a blank line output on eof. If readline() is in use,
1443 the arguments are non-NULL and provide the relevant functions.
1446 fn_readline readline function or NULL
1447 fn_addhist addhist function or NULL
1449 Returns: pointer to dynamic memory, or NULL at end of file
1453 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1456 BOOL had_input = FALSE;
1458 if (!fn_readline) { printf("> "); fflush(stdout); }
1460 for (int i = 0;; i++)
1462 uschar buffer[1024];
1466 char *readline_line = NULL;
1469 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1470 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1471 p = US readline_line;
1476 /* readline() not in use */
1479 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1483 /* Handle the line */
1486 ss = p + Ustrlen(p);
1487 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1490 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1492 g = string_catn(g, p, ss - p);
1495 if (fn_readline) free(readline_line);
1498 /* g can only be NULL if ss==p */
1499 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1502 --g->ptr; /* drop the \ */
1505 if (had_input) return g ? string_from_gstring(g) : US"";
1512 /*************************************************
1513 * Output usage information for the program *
1514 *************************************************/
1516 /* This function is called when there are no recipients
1517 or a specific --help argument was added.
1520 progname information on what name we were called by
1522 Returns: DOES NOT RETURN
1526 exim_usage(uschar *progname)
1529 /* Handle specific program invocation variants */
1530 if (Ustrcmp(progname, US"-mailq") == 0)
1532 "mailq - list the contents of the mail queue\n\n"
1533 "For a list of options, see the Exim documentation.\n");
1535 /* Generic usage - we output this whatever happens */
1537 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1538 "not directly from a shell command line. Options and/or arguments control\n"
1539 "what it does when called. For a list of options, see the Exim documentation.\n");
1544 /*************************************************
1545 * Validate that the macros given are okay *
1546 *************************************************/
1548 /* Typically, Exim will drop privileges if macros are supplied. In some
1549 cases, we want to not do so.
1551 Arguments: opt_D_used - true if the commandline had a "-D" option
1552 Returns: true if trusted, false otherwise
1556 macros_trusted(BOOL opt_D_used)
1558 #ifdef WHITELIST_D_MACROS
1559 uschar *whitelisted, *end, *p, **whites;
1560 int white_count, i, n;
1562 BOOL prev_char_item, found;
1567 #ifndef WHITELIST_D_MACROS
1571 /* We only trust -D overrides for some invoking users:
1572 root, the exim run-time user, the optional config owner user.
1573 I don't know why config-owner would be needed, but since they can own the
1574 config files anyway, there's no security risk to letting them override -D. */
1575 if ( ! ((real_uid == root_uid)
1576 || (real_uid == exim_uid)
1577 #ifdef CONFIGURE_OWNER
1578 || (real_uid == config_uid)
1582 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1586 /* Get a list of macros which are whitelisted */
1587 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1588 prev_char_item = FALSE;
1590 for (p = whitelisted; *p != '\0'; ++p)
1592 if (*p == ':' || isspace(*p))
1597 prev_char_item = FALSE;
1600 if (!prev_char_item)
1601 prev_char_item = TRUE;
1608 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1609 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1614 if (i == white_count)
1616 while (*p != '\0' && p < end)
1622 /* The list of commandline macros should be very short.
1623 Accept the N*M complexity. */
1624 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1627 for (uschar ** w = whites; *w; ++w)
1628 if (Ustrcmp(*w, m->name) == 0)
1635 if (!m->replacement)
1637 if ((len = m->replen) == 0)
1639 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1642 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1648 /*************************************************
1649 * Expansion testing *
1650 *************************************************/
1652 /* Expand and print one item, doing macro-processing.
1655 item line for expansion
1659 expansion_test_line(const uschar * line)
1665 Ustrncpy(big_buffer, line, big_buffer_size);
1666 big_buffer[big_buffer_size-1] = '\0';
1667 len = Ustrlen(big_buffer);
1669 (void) macros_expand(0, &len, &dummy_macexp);
1671 if (isupper(big_buffer[0]))
1673 if (macro_read_assignment(big_buffer))
1674 printf("Defined macro '%s'\n", mlast->name);
1677 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1678 else printf("Failed: %s\n", expand_string_message);
1683 /*************************************************
1684 * Entry point and high-level code *
1685 *************************************************/
1687 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1688 the appropriate action. All the necessary functions are present in the one
1689 binary. I originally thought one should split it up, but it turns out that so
1690 much of the apparatus is needed in each chunk that one might as well just have
1691 it all available all the time, which then makes the coding easier as well.
1694 argc count of entries in argv
1695 argv argument strings, with argv[0] being the program name
1697 Returns: EXIT_SUCCESS if terminated successfully
1698 EXIT_FAILURE otherwise, except when a message has been sent
1699 to the sender, and -oee was given
1703 main(int argc, char **cargv)
1705 uschar **argv = USS cargv;
1706 int arg_receive_timeout = -1;
1707 int arg_smtp_receive_timeout = -1;
1708 int arg_error_handling = error_handling;
1709 int filter_sfd = -1;
1710 int filter_ufd = -1;
1713 int list_queue_option = 0;
1715 int msg_action_arg = -1;
1716 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1717 int queue_only_reason = 0;
1719 int perl_start_option = 0;
1721 int recipients_arg = argc;
1722 int sender_address_domain = 0;
1723 int test_retry_arg = -1;
1724 int test_rewrite_arg = -1;
1725 gid_t original_egid;
1726 BOOL arg_queue_only = FALSE;
1727 BOOL bi_option = FALSE;
1728 BOOL checking = FALSE;
1729 BOOL count_queue = FALSE;
1730 BOOL expansion_test = FALSE;
1731 BOOL extract_recipients = FALSE;
1732 BOOL flag_G = FALSE;
1733 BOOL flag_n = FALSE;
1734 BOOL forced_delivery = FALSE;
1735 BOOL f_end_dot = FALSE;
1736 BOOL deliver_give_up = FALSE;
1737 BOOL list_queue = FALSE;
1738 BOOL list_options = FALSE;
1739 BOOL list_config = FALSE;
1740 BOOL local_queue_only;
1741 BOOL one_msg_action = FALSE;
1742 BOOL opt_D_used = FALSE;
1743 BOOL queue_only_set = FALSE;
1744 BOOL receiving_message = TRUE;
1745 BOOL sender_ident_set = FALSE;
1746 BOOL session_local_queue_only;
1748 BOOL removed_privilege = FALSE;
1749 BOOL usage_wanted = FALSE;
1750 BOOL verify_address_mode = FALSE;
1751 BOOL verify_as_sender = FALSE;
1752 BOOL rcpt_verify_quota = FALSE;
1753 BOOL version_printed = FALSE;
1754 uschar *alias_arg = NULL;
1755 uschar *called_as = US"";
1756 uschar *cmdline_syslog_name = NULL;
1757 uschar *start_queue_run_id = NULL;
1758 uschar *stop_queue_run_id = NULL;
1759 uschar *expansion_test_message = NULL;
1760 const uschar *ftest_domain = NULL;
1761 const uschar *ftest_localpart = NULL;
1762 const uschar *ftest_prefix = NULL;
1763 const uschar *ftest_suffix = NULL;
1764 uschar *log_oneline = NULL;
1765 uschar *malware_test_file = NULL;
1766 uschar *real_sender_address;
1767 uschar *originator_home = US"/";
1771 struct stat statbuf;
1772 pid_t passed_qr_pid = (pid_t)0;
1773 int passed_qr_pipe = -1;
1774 gid_t group_list[EXIM_GROUPLIST_SIZE];
1776 /* For the -bI: flag */
1777 enum commandline_info info_flag = CMDINFO_NONE;
1778 BOOL info_stdout = FALSE;
1780 /* Possible options for -R and -S */
1782 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1784 /* Need to define this in case we need to change the environment in order
1785 to get rid of a bogus time zone. We have to make it char rather than uschar
1786 because some OS define it in /usr/include/unistd.h. */
1788 extern char **environ;
1790 #ifdef MEASURE_TIMING
1791 (void)gettimeofday(×tamp_startup, NULL);
1794 store_init(); /* Initialise the memory allocation susbsystem */
1795 pcre_init(); /* Set up memory handling for pcre */
1797 /* If the Exim user and/or group and/or the configuration file owner/group were
1798 defined by ref:name at build time, we must now find the actual uid/gid values.
1799 This is a feature to make the lives of binary distributors easier. */
1801 #ifdef EXIM_USERNAME
1802 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1805 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1807 /* If ref:name uses a number as the name, route_finduser() returns
1808 TRUE with exim_uid set and pw coerced to NULL. */
1810 exim_gid = pw->pw_gid;
1811 #ifndef EXIM_GROUPNAME
1814 "exim: ref:name should specify a usercode, not a group.\n"
1815 "exim: can't let you get away with it unless you also specify a group.\n");
1819 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1822 #ifdef EXIM_GROUPNAME
1823 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1824 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1827 #ifdef CONFIGURE_OWNERNAME
1828 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1829 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1830 CONFIGURE_OWNERNAME);
1833 /* We default the system_filter_user to be the Exim run-time user, as a
1834 sane non-root value. */
1835 system_filter_uid = exim_uid;
1837 #ifdef CONFIGURE_GROUPNAME
1838 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1839 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1840 CONFIGURE_GROUPNAME);
1843 /* In the Cygwin environment, some initialization used to need doing.
1844 It was fudged in by means of this macro; now no longer but we'll leave
1845 it in case of others. */
1851 /* Check a field which is patched when we are running Exim within its
1852 testing harness; do a fast initial check, and then the whole thing. */
1854 f.running_in_test_harness =
1855 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1856 if (f.running_in_test_harness)
1859 /* Protect against abusive argv[0] */
1860 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1861 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1863 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1864 at the start of a program; however, it seems that some environments do not
1865 follow this. A "strange" locale can affect the formatting of timestamps, so we
1868 setlocale(LC_ALL, "C");
1870 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1872 #ifdef _POSIX_MONOTONIC_CLOCK
1876 /* Set up the default handler for timing using alarm(). */
1878 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1880 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1881 because store_malloc writes a log entry on failure. */
1883 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1884 exim_fail("exim: failed to get store for log buffer\n");
1886 /* Initialize the default log options. */
1888 bits_set(log_selector, log_selector_size, log_default);
1890 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1891 NULL when the daemon is run and the file is closed. We have to use this
1892 indirection, because some systems don't allow writing to the variable "stderr".
1895 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1897 /* Ensure there is a big buffer for temporary use in several places. It is put
1898 in malloc store so that it can be freed for enlargement if necessary. */
1900 big_buffer = store_malloc(big_buffer_size);
1902 /* Set up the handler for the data request signal, and set the initial
1903 descriptive text. */
1905 process_info = store_get(PROCESS_INFO_SIZE, TRUE); /* tainted */
1906 set_process_info("initializing");
1907 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1910 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1911 sigaction(SIGSEGV, &act, NULL);
1914 signal(SIGSEGV, segv_handler); /* log faults */
1917 /* If running in a dockerized environment, the TERM signal is only
1918 delegated to the PID 1 if we request it by setting an signal handler */
1919 if (getpid() == 1) signal(SIGTERM, term_handler);
1921 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1922 in the daemon code. For the rest of Exim's uses, we ignore it. */
1924 signal(SIGHUP, SIG_IGN);
1926 /* We don't want to die on pipe errors as the code is written to handle
1927 the write error instead. */
1929 signal(SIGPIPE, SIG_IGN);
1931 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1932 set to SIG_IGN. This causes subprocesses that complete before the parent
1933 process waits for them not to hang around, so when Exim calls wait(), nothing
1934 is there. The wait() code has been made robust against this, but let's ensure
1935 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1936 ending status. We use sigaction rather than plain signal() on those OS where
1937 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1938 problem on AIX with this.) */
1942 struct sigaction act;
1943 act.sa_handler = SIG_DFL;
1944 sigemptyset(&(act.sa_mask));
1946 sigaction(SIGCHLD, &act, NULL);
1949 signal(SIGCHLD, SIG_DFL);
1952 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1957 /* Set up the version number. Set up the leading 'E' for the external form of
1958 message ids, set the pointer to the internal form, and initialize it to
1959 indicate no message being processed. */
1962 message_id_option[0] = '-';
1963 message_id_external = message_id_option + 1;
1964 message_id_external[0] = 'E';
1965 message_id = message_id_external + 1;
1968 /* Set the umask to zero so that any files Exim creates using open() are
1969 created with the modes that it specifies. NOTE: Files created with fopen() have
1970 a problem, which was not recognized till rather late (February 2006). With this
1971 umask, such files will be world writeable. (They are all content scanning files
1972 in the spool directory, which isn't world-accessible, so this is not a
1973 disaster, but it's untidy.) I don't want to change this overall setting,
1974 however, because it will interact badly with the open() calls. Instead, there's
1975 now a function called modefopen() that fiddles with the umask while calling
1980 /* Precompile the regular expression for matching a message id. Keep this in
1981 step with the code that generates ids in the accept.c module. We need to do
1982 this here, because the -M options check their arguments for syntactic validity
1983 using mac_ismsgid, which uses this. */
1986 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1988 /* Precompile the regular expression that is used for matching an SMTP error
1989 code, possibly extended, at the start of an error message. Note that the
1990 terminating whitespace character is included. */
1993 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1996 #ifdef WHITELIST_D_MACROS
1997 /* Precompile the regular expression used to filter the content of macros
1998 given to -D for permissibility. */
2000 regex_whitelisted_macro =
2001 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", FALSE, TRUE);
2004 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
2006 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2007 this seems to be a generally accepted convention, since one finds symbolic
2008 links called "mailq" in standard OS configurations. */
2010 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2011 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2014 receiving_message = FALSE;
2015 called_as = US"-mailq";
2018 /* If the program is called as "rmail" treat it as equivalent to
2019 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2020 i.e. preventing a single dot on a line from terminating the message, and
2021 returning with zero return code, even in cases of error (provided an error
2022 message has been sent). */
2024 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2025 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2028 called_as = US"-rmail";
2029 errors_sender_rc = EXIT_SUCCESS;
2032 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2033 this is a smail convention. */
2035 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2036 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2038 smtp_input = smtp_batched_input = TRUE;
2039 called_as = US"-rsmtp";
2042 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2043 this is a smail convention. */
2045 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2046 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2049 receiving_message = FALSE;
2050 called_as = US"-runq";
2053 /* If the program is called as "newaliases" treat it as equivalent to
2054 "exim -bi"; this is a sendmail convention. */
2056 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2057 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2060 receiving_message = FALSE;
2061 called_as = US"-newaliases";
2064 /* Save the original effective uid for a couple of uses later. It should
2065 normally be root, but in some esoteric environments it may not be. */
2067 original_euid = geteuid();
2068 original_egid = getegid();
2070 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2071 to be the same as the real ones. This makes a difference only if Exim is setuid
2072 (or setgid) to something other than root, which could be the case in some
2073 special configurations. */
2075 real_uid = getuid();
2076 real_gid = getgid();
2078 if (real_uid == root_uid)
2080 if ((rv = setgid(real_gid)))
2081 exim_fail("exim: setgid(%ld) failed: %s\n",
2082 (long int)real_gid, strerror(errno));
2083 if ((rv = setuid(real_uid)))
2084 exim_fail("exim: setuid(%ld) failed: %s\n",
2085 (long int)real_uid, strerror(errno));
2088 /* If neither the original real uid nor the original euid was root, Exim is
2089 running in an unprivileged state. */
2091 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2093 /* For most of the args-parsing we need to use permanent pool memory */
2095 int old_pool = store_pool;
2096 store_pool = POOL_PERM;
2098 /* Scan the program's arguments. Some can be dealt with right away; others are
2099 simply recorded for checking and handling afterwards. Do a high-level switch
2100 on the second character (the one after '-'), to save some effort. */
2102 for (i = 1; i < argc; i++)
2104 BOOL badarg = FALSE;
2105 uschar * arg = argv[i];
2109 /* An argument not starting with '-' is the start of a recipients list;
2110 break out of the options-scanning loop. */
2118 /* An option consisting of -- terminates the options */
2120 if (Ustrcmp(arg, "--") == 0)
2122 recipients_arg = i + 1;
2126 /* Handle flagged options */
2128 switchchar = arg[1];
2131 /* Make all -ex options synonymous with -oex arguments, since that
2132 is assumed by various callers. Also make -qR options synonymous with -R
2133 options, as that seems to be required as well. Allow for -qqR too, and
2134 the same for -S options. */
2136 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2137 Ustrncmp(arg+1, "qR", 2) == 0 ||
2138 Ustrncmp(arg+1, "qS", 2) == 0)
2140 switchchar = arg[2];
2143 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2145 switchchar = arg[3];
2147 f.queue_2stage = TRUE;
2150 /* Make -r synonymous with -f, since it is a documented alias */
2152 else if (arg[1] == 'r') switchchar = 'f';
2154 /* Make -ov synonymous with -v */
2156 else if (Ustrcmp(arg, "-ov") == 0)
2162 /* deal with --option_aliases */
2163 else if (switchchar == '-')
2165 if (Ustrcmp(argrest, "help") == 0)
2167 usage_wanted = TRUE;
2170 else if (Ustrcmp(argrest, "version") == 0)
2177 /* High-level switch on active initial letter */
2182 /* sendmail uses -Ac and -Am to control which .cf file is used;
2185 if (!*argrest) { badarg = TRUE; break; }
2188 BOOL ignore = FALSE;
2193 if (*(argrest + 1) == '\0')
2197 if (!ignore) badarg = TRUE;
2201 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2202 so has no need of it. */
2205 if (!*argrest) i++; /* Skip over the type */
2211 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2215 /* -bd: Run in daemon mode, awaiting SMTP connections.
2216 -bdf: Ditto, but in the foreground.
2219 f.daemon_listen = TRUE;
2220 if (*argrest == 'f') f.background_daemon = FALSE;
2221 else if (*argrest) badarg = TRUE;
2224 /* -be: Run in expansion test mode
2225 -bem: Ditto, but read a message from a file first
2228 expansion_test = checking = TRUE;
2229 if (*argrest == 'm')
2231 if (++i >= argc) { badarg = TRUE; break; }
2232 expansion_test_message = argv[i];
2235 if (*argrest) badarg = TRUE;
2238 /* -bF: Run system filter test */
2240 filter_test |= checking = FTEST_SYSTEM;
2241 if (*argrest) badarg = TRUE;
2242 else if (++i < argc) filter_test_sfile = argv[i];
2243 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2246 /* -bf: Run user filter test
2247 -bfd: Set domain for filter testing
2248 -bfl: Set local part for filter testing
2249 -bfp: Set prefix for filter testing
2250 -bfs: Set suffix for filter testing
2255 filter_test |= checking = FTEST_USER;
2256 if (++i < argc) filter_test_ufile = argv[i];
2257 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2262 exim_fail("exim: string expected after %s\n", arg);
2263 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2264 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2265 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2266 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2271 /* -bh: Host checking - an IP address must follow. */
2273 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2275 if (++i >= argc) { badarg = TRUE; break; }
2276 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"), TRUE);
2277 host_checking = checking = f.log_testing_mode = TRUE;
2278 f.host_checking_callout = *argrest == 'c';
2279 message_logs = FALSE;
2284 /* -bi: This option is used by sendmail to initialize *the* alias file,
2285 though it has the -oA option to specify a different file. Exim has no
2286 concept of *the* alias file, but since Sun's YP make script calls
2287 sendmail this way, some support must be provided. */
2289 if (!*argrest) bi_option = TRUE;
2293 /* -bI: provide information, of the type to follow after a colon.
2294 This is an Exim flag. */
2296 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2298 uschar *p = argrest+1;
2299 info_flag = CMDINFO_HELP;
2301 if (strcmpic(p, CUS"sieve") == 0)
2303 info_flag = CMDINFO_SIEVE;
2306 else if (strcmpic(p, CUS"dscp") == 0)
2308 info_flag = CMDINFO_DSCP;
2311 else if (strcmpic(p, CUS"help") == 0)
2317 /* -bm: Accept and deliver message - the default option. Reinstate
2318 receiving_message, which got turned off for all -b options.
2319 -bmalware: test the filename given for malware */
2321 if (!*argrest) receiving_message = TRUE;
2322 else if (Ustrcmp(argrest, "alware") == 0)
2324 if (++i >= argc) { badarg = TRUE; break; }
2326 malware_test_file = argv[i];
2331 /* -bnq: For locally originating messages, do not qualify unqualified
2332 addresses. In the envelope, this causes errors; in header lines they
2335 if (Ustrcmp(argrest, "q") == 0)
2337 f.allow_unqualified_sender = FALSE;
2338 f.allow_unqualified_recipient = FALSE;
2343 /* -bpxx: List the contents of the mail queue, in various forms. If
2344 the option is -bpc, just a queue count is needed. Otherwise, if the
2345 first letter after p is r, then order is random. */
2347 if (*argrest == 'c')
2350 if (*++argrest) badarg = TRUE;
2354 if (*argrest == 'r')
2356 list_queue_option = 8;
2359 else list_queue_option = 0;
2363 /* -bp: List the contents of the mail queue, top-level only */
2367 /* -bpu: List the contents of the mail queue, top-level undelivered */
2369 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2371 /* -bpa: List the contents of the mail queue, including all delivered */
2373 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2375 /* Unknown after -bp[r] */
2381 /* -bP: List the configuration variables given as the address list.
2382 Force -v, so configuration errors get displayed. */
2385 /* -bP config: we need to setup here, because later,
2386 when list_options is checked, the config is read already */
2389 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2392 readconf_save_config(version_string);
2396 list_options = TRUE;
2397 debug_selector |= D_v;
2398 debug_file = stderr;
2402 /* -brt: Test retry configuration lookup */
2404 if (Ustrcmp(argrest, "t") == 0)
2407 test_retry_arg = i + 1;
2411 /* -brw: Test rewrite configuration */
2413 else if (Ustrcmp(argrest, "w") == 0)
2416 test_rewrite_arg = i + 1;
2422 /* -bS: Read SMTP commands on standard input, but produce no replies -
2423 all errors are reported by sending messages. */
2426 smtp_input = smtp_batched_input = receiving_message = TRUE;
2430 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2431 on standard output. */
2433 if (!*argrest) smtp_input = receiving_message = TRUE;
2437 /* -bt: address testing mode */
2440 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2444 /* -bv: verify addresses */
2447 verify_address_mode = checking = f.log_testing_mode = TRUE;
2449 /* -bvs: verify sender addresses */
2451 else if (Ustrcmp(argrest, "s") == 0)
2453 verify_address_mode = checking = f.log_testing_mode = TRUE;
2454 verify_as_sender = TRUE;
2459 /* -bV: Print version string and support details */
2463 printf("Exim version %s #%s built %s\n", version_string,
2464 version_cnumber, version_date);
2465 printf("%s\n", CS version_copyright);
2466 version_printed = TRUE;
2467 show_whats_supported(TRUE);
2468 f.log_testing_mode = TRUE;
2473 /* -bw: inetd wait mode, accept a listening socket as stdin */
2475 f.inetd_wait_mode = TRUE;
2476 f.background_daemon = FALSE;
2477 f.daemon_listen = TRUE;
2479 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2480 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2491 /* -C: change configuration file list; ignore if it isn't really
2492 a change! Enforce a prefix check if required. */
2496 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2497 if (Ustrcmp(config_main_filelist, argrest) != 0)
2499 #ifdef ALT_CONFIG_PREFIX
2501 int len = Ustrlen(ALT_CONFIG_PREFIX);
2502 const uschar *list = argrest;
2504 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2505 while((filename = string_nextinlist(&list, &sep, big_buffer,
2507 if ( ( Ustrlen(filename) < len
2508 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2509 || Ustrstr(filename, "/../") != NULL
2511 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2513 exim_fail("-C Permission denied\n");
2515 if (real_uid != root_uid)
2517 #ifdef TRUSTED_CONFIG_LIST
2519 if (real_uid != exim_uid
2520 #ifdef CONFIGURE_OWNER
2521 && real_uid != config_uid
2524 f.trusted_config = FALSE;
2527 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2530 struct stat statbuf;
2532 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2533 (statbuf.st_uid != root_uid /* owner not root */
2534 #ifdef CONFIGURE_OWNER
2535 && statbuf.st_uid != config_uid /* owner not the special one */
2538 (statbuf.st_gid != root_gid /* group not root */
2539 #ifdef CONFIGURE_GROUP
2540 && statbuf.st_gid != config_gid /* group not the special one */
2542 && (statbuf.st_mode & 020) != 0 /* group writeable */
2544 (statbuf.st_mode & 2) != 0) /* world writeable */
2546 f.trusted_config = FALSE;
2551 /* Well, the trust list at least is up to scratch... */
2553 uschar *trusted_configs[32];
2556 int old_pool = store_pool;
2557 store_pool = POOL_MAIN;
2559 reset_point = store_mark();
2560 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2562 uschar *start = big_buffer, *nl;
2563 while (*start && isspace(*start))
2567 nl = Ustrchr(start, '\n');
2570 trusted_configs[nr_configs++] = string_copy(start);
2571 if (nr_configs == nelem(trusted_configs))
2579 const uschar *list = argrest;
2581 while (f.trusted_config && (filename = string_nextinlist(&list,
2582 &sep, big_buffer, big_buffer_size)))
2584 for (i=0; i < nr_configs; i++)
2585 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2587 if (i == nr_configs)
2589 f.trusted_config = FALSE;
2594 else /* No valid prefixes found in trust_list file. */
2595 f.trusted_config = FALSE;
2596 store_reset(reset_point);
2597 store_pool = old_pool;
2600 else /* Could not open trust_list file. */
2601 f.trusted_config = FALSE;
2604 /* Not root; don't trust config */
2605 f.trusted_config = FALSE;
2609 config_main_filelist = argrest;
2610 f.config_changed = TRUE;
2615 /* -D: set up a macro definition */
2618 #ifdef DISABLE_D_OPTION
2619 exim_fail("exim: -D is not available in this Exim binary\n");
2625 uschar *s = argrest;
2628 while (isspace(*s)) s++;
2630 if (*s < 'A' || *s > 'Z')
2631 exim_fail("exim: macro name set by -D must start with "
2632 "an upper case letter\n");
2634 while (isalnum(*s) || *s == '_')
2636 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2640 if (ptr == 0) { badarg = TRUE; break; }
2641 while (isspace(*s)) s++;
2644 if (*s++ != '=') { badarg = TRUE; break; }
2645 while (isspace(*s)) s++;
2648 for (m = macros_user; m; m = m->next)
2649 if (Ustrcmp(m->name, name) == 0)
2650 exim_fail("exim: duplicated -D in command line\n");
2652 m = macro_create(name, s, TRUE);
2654 if (clmacro_count >= MAX_CLMACROS)
2655 exim_fail("exim: too many -D options on command line\n");
2656 clmacros[clmacro_count++] =
2657 string_sprintf("-D%s=%s", m->name, m->replacement);
2664 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2666 if (Ustrcmp(argrest, "ropcr") == 0)
2668 /* drop_cr = TRUE; */
2671 /* -dp: Set up a debug pretrigger buffer with given size. */
2673 else if (Ustrcmp(argrest, "p") == 0)
2677 debug_pretrigger_setup(argv[i]);
2679 /* -dt: Set a debug trigger selector */
2681 else if (Ustrncmp(argrest, "t=", 2) == 0)
2682 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2684 /* -d: Set debug level (see also -v below).
2685 If -dd is used, debugging subprocesses of the daemon is disabled. */
2689 /* Use an intermediate variable so that we don't set debugging while
2690 decoding the debugging bits. */
2692 unsigned int selector = D_default;
2695 if (*argrest == 'd')
2697 f.debug_daemon = TRUE;
2701 decode_bits(&selector, 1, debug_notall, argrest,
2702 debug_options, debug_options_count, US"debug", 0);
2703 debug_selector = selector;
2708 /* -E: This is a local error message. This option is not intended for
2709 external use at all, but is not restricted to trusted callers because it
2710 does no harm (just suppresses certain error messages) and if Exim is run
2711 not setuid root it won't always be trusted when it generates error
2712 messages using this option. If there is a message id following -E, point
2713 message_reference at it, for logging. */
2716 f.local_error_message = TRUE;
2717 if (mac_ismsgid(argrest)) message_reference = argrest;
2721 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2722 option, so it looks as if historically the -oex options are also callable
2723 without the leading -o. So we have to accept them. Before the switch,
2724 anything starting -oe has been converted to -e. Exim does not support all
2725 of the sendmail error options. */
2728 if (Ustrcmp(argrest, "e") == 0)
2730 arg_error_handling = ERRORS_SENDER;
2731 errors_sender_rc = EXIT_SUCCESS;
2733 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2734 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2735 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2736 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2741 /* -F: Set sender's full name, used instead of the gecos entry from
2742 the password file. Since users can usually alter their gecos entries,
2743 there's no security involved in using this instead. The data can follow
2744 the -F or be in the next argument. */
2748 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2749 originator_name = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"), TRUE);
2750 f.sender_name_forced = TRUE;
2754 /* -f: Set sender's address - this value is only actually used if Exim is
2755 run by a trusted user, or if untrusted_set_sender is set and matches the
2756 address, except that the null address can always be set by any user. The
2757 test for this happens later, when the value given here is ignored when not
2758 permitted. For an untrusted user, the actual sender is still put in Sender:
2759 if it doesn't match the From: header (unless no_local_from_check is set).
2760 The data can follow the -f or be in the next argument. The -r switch is an
2761 obsolete form of -f but since there appear to be programs out there that
2762 use anything that sendmail has ever supported, better accept it - the
2763 synonymizing is done before the switch above.
2765 At this stage, we must allow domain literal addresses, because we don't
2766 know what the setting of allow_domain_literals is yet. Ditto for trailing
2767 dots and strip_trailing_dot. */
2771 int dummy_start, dummy_end;
2774 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2775 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2777 *(sender_address = store_get(1, FALSE)) = '\0'; /* Ensure writeable memory */
2780 uschar * temp = argrest + Ustrlen(argrest) - 1;
2781 while (temp >= argrest && isspace(*temp)) temp--;
2782 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2783 allow_domain_literals = TRUE;
2784 strip_trailing_dot = TRUE;
2786 allow_utf8_domains = TRUE;
2788 if (!(sender_address = parse_extract_address(argrest, &errmess,
2789 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2790 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2792 sender_address = string_copy_taint(sender_address, TRUE);
2794 message_smtputf8 = string_is_utf8(sender_address);
2795 allow_utf8_domains = FALSE;
2797 allow_domain_literals = FALSE;
2798 strip_trailing_dot = FALSE;
2800 f.sender_address_forced = TRUE;
2804 /* -G: sendmail invocation to specify that it's a gateway submission and
2805 sendmail may complain about problems instead of fixing them.
2806 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2807 not at this time complain about problems. */
2813 /* -h: Set the hop count for an incoming message. Exim does not currently
2814 support this; it always computes it by counting the Received: headers.
2815 To put it in will require a change to the spool header file format. */
2819 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2820 if (!isdigit(*argrest)) badarg = TRUE;
2824 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2825 not to be documented for sendmail but mailx (at least) uses it) */
2828 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2832 /* -L: set the identifier used for syslog; equivalent to setting
2833 syslog_processname in the config file, but needs to be an admin option. */
2837 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2838 if ((sz = Ustrlen(argrest)) > 32)
2839 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2841 exim_fail("exim: the -L syslog name is too short\n");
2842 cmdline_syslog_name = string_copy_taint(argrest, TRUE);
2846 receiving_message = FALSE;
2848 /* -MC: continue delivery of another message via an existing open
2849 file descriptor. This option is used for an internal call by the
2850 smtp transport when there is a pending message waiting to go to an
2851 address to which it has got a connection. Five subsequent arguments are
2852 required: transport name, host name, IP address, sequence number, and
2853 message_id. Transports may decline to create new processes if the sequence
2854 number gets too big. The channel is stdin. This (-MC) must be the last
2855 argument. There's a subsequent check that the real-uid is privileged.
2857 If we are running in the test harness. delay for a bit, to let the process
2858 that set this one up complete. This makes for repeatability of the logging,
2861 if (Ustrcmp(argrest, "C") == 0)
2863 union sockaddr_46 interface_sock;
2864 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2867 exim_fail("exim: too many or too few arguments after -MC\n");
2869 if (msg_action_arg >= 0)
2870 exim_fail("exim: incompatible arguments\n");
2872 continue_transport = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"), TRUE);
2873 continue_hostname = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"), TRUE);
2874 continue_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"), TRUE);
2875 continue_sequence = Uatoi(argv[++i]);
2876 msg_action = MSG_DELIVER;
2877 msg_action_arg = ++i;
2878 forced_delivery = TRUE;
2879 queue_run_pid = passed_qr_pid;
2880 queue_run_pipe = passed_qr_pipe;
2882 if (!mac_ismsgid(argv[i]))
2883 exim_fail("exim: malformed message id %s after -MC option\n",
2886 /* Set up $sending_ip_address and $sending_port, unless proxied */
2888 if (!continue_proxy_cipher)
2889 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2891 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2894 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2897 testharness_pause_ms(500);
2901 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2905 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2906 precedes -MC (see above). The flag indicates that the host to which
2907 Exim is connected has accepted an AUTH sequence. */
2909 case 'A': f.smtp_authenticated = TRUE; break;
2911 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2912 that exim is connected to supports the esmtp extension DSN */
2914 case 'D': smtp_peer_options |= OPTION_DSN; break;
2916 /* -MCd: for debug, set a process-purpose string */
2918 case 'd': if (++i < argc)
2919 process_purpose = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"), TRUE);
2923 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2924 from the commandline should be tainted - but we will need an untainted
2925 value for the spoolfile when doing a -odi delivery process. */
2927 case 'G': if (++i < argc) queue_name = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"), FALSE);
2931 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2933 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2935 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2936 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2937 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2939 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2941 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2946 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2947 it preceded -MC (see above) */
2949 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2951 #ifdef SUPPORT_SOCKS
2952 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2953 case 'p': proxy_session = TRUE;
2956 proxy_local_address = string_copy_taint(argv[i], TRUE);
2959 proxy_local_port = Uatoi(argv[i]);
2962 proxy_external_address = string_copy_taint(argv[i], TRUE);
2965 proxy_external_port = Uatoi(argv[i]);
2971 /* -MCQ: pass on the pid of the queue-running process that started
2972 this chain of deliveries and the fd of its synchronizing pipe; this
2973 is useful only when it precedes -MC (see above) */
2975 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2977 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2981 /* -MCq: do a quota check on the given recipient for the given size
2982 of message. Separate from -MC. */
2983 case 'q': rcpt_verify_quota = TRUE;
2984 if (++i < argc) message_size = Uatoi(argv[i]);
2988 /* -MCS: set the smtp_use_size flag; this is useful only when it
2989 precedes -MC (see above) */
2991 case 'S': smtp_peer_options |= OPTION_SIZE; break;
2994 /* -MCs: used with -MCt; SNI was sent */
2995 /* -MCr: ditto, DANE */
2998 case 's': if (++i < argc)
3000 continue_proxy_sni = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"), TRUE);
3001 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3006 /* -MCt: similar to -MCT below but the connection is still open
3007 via a proxy process which handles the TLS context and coding.
3008 Require three arguments for the proxied local address and port,
3009 and the TLS cipher. */
3011 case 't': if (++i < argc)
3012 sending_ip_address = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"), TRUE);
3015 sending_port = (int)(Uatol(argv[i]));
3018 continue_proxy_cipher = string_copy_taint(exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"), TRUE);
3022 /* -MCT: set the tls_offered flag; this is useful only when it
3023 precedes -MC (see above). The flag indicates that the host to which
3024 Exim is connected has offered TLS support. */
3026 case 'T': smtp_peer_options |= OPTION_TLS; break;
3029 default: badarg = TRUE; break;
3034 /* -M[x]: various operations on the following list of message ids:
3035 -M deliver the messages, ignoring next retry times and thawing
3036 -Mc deliver the messages, checking next retry times, no thawing
3037 -Mf freeze the messages
3038 -Mg give up on the messages
3039 -Mt thaw the messages
3040 -Mrm remove the messages
3041 In the above cases, this must be the last option. There are also the
3042 following options which are followed by a single message id, and which
3043 act on that message. Some of them use the "recipient" addresses as well.
3044 -Mar add recipient(s)
3045 -MG move to a different queue
3046 -Mmad mark all recipients delivered
3047 -Mmd mark recipients(s) delivered
3049 -Mset load a message for use with -be
3051 -Mvc show copy (of whole message, in RFC 2822 format)
3058 msg_action = MSG_DELIVER;
3059 forced_delivery = f.deliver_force_thaw = TRUE;
3061 else if (Ustrcmp(argrest, "ar") == 0)
3063 msg_action = MSG_ADD_RECIPIENT;
3064 one_msg_action = TRUE;
3066 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3067 else if (Ustrcmp(argrest, "es") == 0)
3069 msg_action = MSG_EDIT_SENDER;
3070 one_msg_action = TRUE;
3072 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3073 else if (Ustrcmp(argrest, "g") == 0)
3075 msg_action = MSG_DELIVER;
3076 deliver_give_up = TRUE;
3078 else if (Ustrcmp(argrest, "G") == 0)
3080 msg_action = MSG_SETQUEUE;
3081 queue_name_dest = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"), TRUE);
3083 else if (Ustrcmp(argrest, "mad") == 0)
3085 msg_action = MSG_MARK_ALL_DELIVERED;
3087 else if (Ustrcmp(argrest, "md") == 0)
3089 msg_action = MSG_MARK_DELIVERED;
3090 one_msg_action = TRUE;
3092 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3093 else if (Ustrcmp(argrest, "set") == 0)
3095 msg_action = MSG_LOAD;
3096 one_msg_action = TRUE;
3098 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3099 else if (Ustrcmp(argrest, "vb") == 0)
3101 msg_action = MSG_SHOW_BODY;
3102 one_msg_action = TRUE;
3104 else if (Ustrcmp(argrest, "vc") == 0)
3106 msg_action = MSG_SHOW_COPY;
3107 one_msg_action = TRUE;
3109 else if (Ustrcmp(argrest, "vh") == 0)
3111 msg_action = MSG_SHOW_HEADER;
3112 one_msg_action = TRUE;
3114 else if (Ustrcmp(argrest, "vl") == 0)
3116 msg_action = MSG_SHOW_LOG;
3117 one_msg_action = TRUE;
3119 else { badarg = TRUE; break; }
3121 /* All the -Mxx options require at least one message id. */
3123 msg_action_arg = i + 1;
3124 if (msg_action_arg >= argc)
3125 exim_fail("exim: no message ids given after %s option\n", arg);
3127 /* Some require only message ids to follow */
3129 if (!one_msg_action)
3131 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3132 exim_fail("exim: malformed message id %s after %s option\n",
3134 goto END_ARG; /* Remaining args are ids */
3137 /* Others require only one message id, possibly followed by addresses,
3138 which will be handled as normal arguments. */
3142 if (!mac_ismsgid(argv[msg_action_arg]))
3143 exim_fail("exim: malformed message id %s after %s option\n",
3144 argv[msg_action_arg], arg);
3150 /* Some programs seem to call the -om option without the leading o;
3151 for sendmail it askes for "me too". Exim always does this. */
3154 if (*argrest) badarg = TRUE;
3158 /* -N: don't do delivery - a debugging option that stops transports doing
3159 their thing. It implies debugging at the D_v level. */
3164 f.dont_deliver = TRUE;
3165 debug_selector |= D_v;
3166 debug_file = stderr;
3172 /* -n: This means "don't alias" in sendmail, apparently.
3173 For normal invocations, it has no effect.
3174 It may affect some other options. */
3180 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3181 option to the specified value. This form uses long names. We need to handle
3182 -O option=value and -Ooption=value. */
3187 exim_fail("exim: string expected after -O\n");
3193 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3196 if (!*(alias_arg = argrest))
3197 if (i+1 < argc) alias_arg = argv[++i];
3198 else exim_fail("exim: string expected after -oA\n");
3201 /* -oB: Set a connection message max value for remote deliveries */
3204 uschar * p = argrest;
3206 if (i+1 < argc && isdigit((argv[i+1][0])))
3210 connection_max_messages = 1;
3217 exim_fail("exim: number expected after -oB\n");
3218 connection_max_messages = Uatoi(p);
3223 /* -odb: background delivery */
3226 if (Ustrcmp(argrest, "b") == 0)
3228 f.synchronous_delivery = FALSE;
3229 arg_queue_only = FALSE;
3230 queue_only_set = TRUE;
3233 /* -odd: testsuite-only: add no inter-process delays */
3235 else if (Ustrcmp(argrest, "d") == 0)
3236 f.testsuite_delays = FALSE;
3238 /* -odf: foreground delivery (smail-compatible option); same effect as
3239 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3242 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3244 f.synchronous_delivery = TRUE;
3245 arg_queue_only = FALSE;
3246 queue_only_set = TRUE;
3249 /* -odq: queue only */
3251 else if (Ustrcmp(argrest, "q") == 0)
3253 f.synchronous_delivery = FALSE;
3254 arg_queue_only = TRUE;
3255 queue_only_set = TRUE;
3258 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3259 but no remote delivery */
3261 else if (Ustrcmp(argrest, "qs") == 0)
3263 f.queue_smtp = TRUE;
3264 arg_queue_only = FALSE;
3265 queue_only_set = TRUE;
3270 /* -oex: Sendmail error flags. As these are also accepted without the
3271 leading -o prefix, for compatibility with vacation and other callers,
3272 they are handled with -e above. */
3274 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3275 -oitrue: Another sendmail syntax for the same */
3278 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3283 /* -oM*: Set various characteristics for an incoming message; actually
3284 acted on for trusted callers only. */
3289 exim_fail("exim: data expected after -oM%s\n", argrest);
3291 /* -oMa: Set sender host address */
3293 if (Ustrcmp(argrest, "a") == 0)
3294 sender_host_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"), TRUE);
3296 /* -oMaa: Set authenticator name */
3298 else if (Ustrcmp(argrest, "aa") == 0)
3299 sender_host_authenticated = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"), TRUE);
3301 /* -oMas: setting authenticated sender */
3303 else if (Ustrcmp(argrest, "as") == 0)
3304 authenticated_sender = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3306 /* -oMai: setting authenticated id */
3308 else if (Ustrcmp(argrest, "ai") == 0)
3309 authenticated_id = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"), TRUE);
3311 /* -oMi: Set incoming interface address */
3313 else if (Ustrcmp(argrest, "i") == 0)
3314 interface_address = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"), TRUE);
3316 /* -oMm: Message reference */
3318 else if (Ustrcmp(argrest, "m") == 0)
3320 if (!mac_ismsgid(argv[i+1]))
3321 exim_fail("-oMm must be a valid message ID\n");
3322 if (!f.trusted_config)
3323 exim_fail("-oMm must be called by a trusted user/config\n");
3324 message_reference = argv[++i];
3327 /* -oMr: Received protocol */
3329 else if (Ustrcmp(argrest, "r") == 0)
3331 if (received_protocol)
3332 exim_fail("received_protocol is set already\n");
3334 received_protocol = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"), TRUE);
3336 /* -oMs: Set sender host name */
3338 else if (Ustrcmp(argrest, "s") == 0)
3339 sender_host_name = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"), TRUE);
3341 /* -oMt: Set sender ident */
3343 else if (Ustrcmp(argrest, "t") == 0)
3345 sender_ident_set = TRUE;
3346 sender_ident = string_copy_taint(exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"), TRUE);
3349 /* Else a bad argument */
3356 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3357 seem to call this as -m (undocumented), so that is also accepted (see
3359 /* -oo: An ancient flag for old-style addresses which still seems to
3360 crop up in some calls (see in SCO). */
3364 if (*argrest) badarg = TRUE;
3367 /* -oP <name>: set pid file path for daemon
3368 -oPX: delete pid file of daemon */
3371 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3372 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3373 "(uid=%d euid=%d | %d)\n",
3374 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3375 if (!*argrest) override_pid_file_path = argv[++i];
3376 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3381 /* -or <n>: set timeout for non-SMTP acceptance
3382 -os <n>: set timeout for SMTP acceptance */
3387 int * tp = argrest[-1] == 'r'
3388 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3390 *tp = readconf_readtime(argrest, 0, FALSE);
3391 else if (i+1 < argc)
3392 *tp = readconf_readtime(argv[++i], 0, FALSE);
3395 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3399 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3400 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3403 if (*argrest) badarg = TRUE;
3404 else override_local_interfaces = string_copy_taint(exim_str_fail_toolong(argv[++i], 1024, "-oX"), TRUE);
3407 /* -oY: Override creation of daemon notifier socket */
3410 if (*argrest) badarg = TRUE;
3411 else notifier_socket = NULL;
3414 /* Unknown -o argument */
3422 /* -ps: force Perl startup; -pd force delayed Perl startup */
3426 if (*argrest == 's' && argrest[1] == 0)
3428 perl_start_option = 1;
3431 if (*argrest == 'd' && argrest[1] == 0)
3433 perl_start_option = -1;
3438 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3439 which sets the host protocol and host name */
3442 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3446 uschar * hn = Ustrchr(argrest, ':');
3448 if (received_protocol)
3449 exim_fail("received_protocol is set already\n");
3452 received_protocol = string_copy_taint(exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"), TRUE);
3455 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3456 received_protocol = string_copyn_taint(argrest, hn - argrest, TRUE);
3457 sender_host_name = string_copy_taint(hn + 1, TRUE);
3464 receiving_message = FALSE;
3465 if (queue_interval >= 0)
3466 exim_fail("exim: -q specified more than once\n");
3468 /* -qq...: Do queue runs in a 2-stage manner */
3470 if (*argrest == 'q')
3472 f.queue_2stage = TRUE;
3476 /* -qi...: Do only first (initial) deliveries */
3478 if (*argrest == 'i')
3480 f.queue_run_first_delivery = TRUE;
3484 /* -qf...: Run the queue, forcing deliveries
3485 -qff..: Ditto, forcing thawing as well */
3487 if (*argrest == 'f')
3489 f.queue_run_force = TRUE;
3490 if (*++argrest == 'f')
3492 f.deliver_force_thaw = TRUE;
3497 /* -q[f][f]l...: Run the queue only on local deliveries */
3499 if (*argrest == 'l')
3501 f.queue_run_local = TRUE;
3505 /* -q[f][f][l][G<name>]... Work on the named queue */
3507 if (*argrest == 'G')
3510 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3511 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3512 queue_name = string_copyn(argrest, i);
3514 if (*argrest == '/') argrest++;
3517 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3518 only, optionally named, optionally starting from a given message id. */
3520 if (!(list_queue || count_queue))
3522 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3525 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3526 start_queue_run_id = string_copy_taint(argv[++i], TRUE);
3527 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3528 stop_queue_run_id = string_copy_taint(argv[++i], TRUE);
3531 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3532 forced, optionally local only, optionally named. */
3534 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3536 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3540 case 'R': /* Synonymous with -qR... */
3542 const uschar *tainted_selectstr;
3544 receiving_message = FALSE;
3546 /* -Rf: As -R (below) but force all deliveries,
3547 -Rff: Ditto, but also thaw all frozen messages,
3548 -Rr: String is regex
3549 -Rrf: Regex and force
3550 -Rrff: Regex and force and thaw
3552 in all cases provided there are no further characters in this
3556 for (int i = 0; i < nelem(rsopts); i++)
3557 if (Ustrcmp(argrest, rsopts[i]) == 0)
3559 if (i != 2) f.queue_run_force = TRUE;
3560 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3561 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3562 argrest += Ustrlen(rsopts[i]);
3565 /* -R: Set string to match in addresses for forced queue run to
3566 pick out particular messages. */
3568 /* Avoid attacks from people providing very long strings, and do so before
3571 tainted_selectstr = argrest;
3572 else if (i+1 < argc)
3573 tainted_selectstr = argv[++i];
3575 exim_fail("exim: string expected after -R\n");
3576 deliver_selectstring = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"), TRUE);
3580 /* -r: an obsolete synonym for -f (see above) */
3583 /* -S: Like -R but works on sender. */
3585 case 'S': /* Synonymous with -qS... */
3587 const uschar *tainted_selectstr;
3589 receiving_message = FALSE;
3591 /* -Sf: As -S (below) but force all deliveries,
3592 -Sff: Ditto, but also thaw all frozen messages,
3593 -Sr: String is regex
3594 -Srf: Regex and force
3595 -Srff: Regex and force and thaw
3597 in all cases provided there are no further characters in this
3601 for (int i = 0; i < nelem(rsopts); i++)
3602 if (Ustrcmp(argrest, rsopts[i]) == 0)
3604 if (i != 2) f.queue_run_force = TRUE;
3605 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3606 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3607 argrest += Ustrlen(rsopts[i]);
3610 /* -S: Set string to match in addresses for forced queue run to
3611 pick out particular messages. */
3614 tainted_selectstr = argrest;
3615 else if (i+1 < argc)
3616 tainted_selectstr = argv[++i];
3618 exim_fail("exim: string expected after -S\n");
3619 deliver_selectstring_sender = string_copy_taint(exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"), TRUE);
3623 /* -Tqt is an option that is exclusively for use by the testing suite.
3624 It is not recognized in other circumstances. It allows for the setting up
3625 of explicit "queue times" so that various warning/retry things can be
3626 tested. Otherwise variability of clock ticks etc. cause problems. */
3629 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3630 fudged_queue_times = string_copy_taint(argv[++i], TRUE);
3635 /* -t: Set flag to extract recipients from body of message. */
3638 if (!*argrest) extract_recipients = TRUE;
3640 /* -ti: Set flag to extract recipients from body of message, and also
3641 specify that dot does not end the message. */
3643 else if (Ustrcmp(argrest, "i") == 0)
3645 extract_recipients = TRUE;
3649 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3652 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3659 /* -U: This means "initial user submission" in sendmail, apparently. The
3660 doc claims that in future sendmail may refuse syntactically invalid
3661 messages instead of fixing them. For the moment, we just ignore it. */
3667 /* -v: verify things - this is a very low-level debugging */
3672 debug_selector |= D_v;
3673 debug_file = stderr;
3679 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3681 The -x flag tells the sendmail command that mail from a local
3682 mail program has National Language Support (NLS) extended characters
3683 in the body of the mail item. The sendmail command can send mail with
3684 extended NLS characters across networks that normally corrupts these
3687 As Exim is 8-bit clean, it just ignores this flag. */
3690 if (*argrest) badarg = TRUE;
3693 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3694 logs to that file. We swallow the parameter and otherwise ignore it. */
3699 exim_fail("exim: string expected after -X\n");
3702 /* -z: a line of text to log */
3707 log_oneline = string_copy_taint(exim_str_fail_toolong(argv[i], 2048, "-z logtext"), TRUE);
3709 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3712 /* All other initial characters are errors */
3717 } /* End of high-level switch statement */
3719 /* Failed to recognize the option, or syntax error */
3722 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3723 "option %s\n", arg);
3727 /* If -R or -S have been specified without -q, assume a single queue run. */
3729 if ( (deliver_selectstring || deliver_selectstring_sender)
3730 && queue_interval < 0)
3735 store_pool = old_pool;
3738 /* If usage_wanted is set we call the usage function - which never returns */
3739 if (usage_wanted) exim_usage(called_as);
3741 /* Arguments have been processed. Check for incompatibilities. */
3742 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3743 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3744 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3745 || filter_test != FTEST_NONE
3746 || msg_action_arg > 0 && !one_msg_action
3748 || ( msg_action_arg > 0
3749 && ( f.daemon_listen || queue_interval > 0 || list_options
3750 || checking && msg_action != MSG_LOAD
3751 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3753 || ( (f.daemon_listen || queue_interval > 0)
3754 && ( sender_address || list_options || list_queue || checking
3757 || f.daemon_listen && queue_interval == 0
3758 || f.inetd_wait_mode && queue_interval >= 0
3760 && ( checking || smtp_input || extract_recipients
3761 || filter_test != FTEST_NONE || bi_option
3763 || ( verify_address_mode
3764 && ( f.address_test_mode || smtp_input || extract_recipients
3765 || filter_test != FTEST_NONE || bi_option
3767 || ( f.address_test_mode
3768 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3772 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3774 || deliver_selectstring && queue_interval < 0
3775 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3777 exim_fail("exim: incompatible command-line options or arguments\n");
3779 /* If debugging is set up, set the file and the file descriptor to pass on to
3780 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3781 to run in the foreground. */
3783 if (debug_selector != 0)
3785 debug_file = stderr;
3786 debug_fd = fileno(debug_file);
3787 f.background_daemon = FALSE;
3788 testharness_pause_ms(100); /* lets caller finish */
3789 if (debug_selector != D_v) /* -v only doesn't show this */
3791 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3792 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3794 if (!version_printed)
3795 show_whats_supported(FALSE);
3799 /* When started with root privilege, ensure that the limits on the number of
3800 open files and the number of processes (where that is accessible) are
3801 sufficiently large, or are unset, in case Exim has been called from an
3802 environment where the limits are screwed down. Not all OS have the ability to
3803 change some of these limits. */
3807 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3813 #ifdef RLIMIT_NOFILE
3814 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3816 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3818 rlp.rlim_cur = rlp.rlim_max = 0;
3821 /* I originally chose 1000 as a nice big number that was unlikely to
3822 be exceeded. It turns out that some older OS have a fixed upper limit of
3825 if (rlp.rlim_cur < 1000)
3827 rlp.rlim_cur = rlp.rlim_max = 1000;
3828 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3830 rlp.rlim_cur = rlp.rlim_max = 256;
3831 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3832 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3839 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3841 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3843 rlp.rlim_cur = rlp.rlim_max = 0;
3846 # ifdef RLIM_INFINITY
3847 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3849 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3851 if (rlp.rlim_cur < 1000)
3853 rlp.rlim_cur = rlp.rlim_max = 1000;
3855 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3856 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3862 /* Exim is normally entered as root (but some special configurations are
3863 possible that don't do this). However, it always spins off sub-processes that
3864 set their uid and gid as required for local delivery. We don't want to pass on
3865 any extra groups that root may belong to, so we want to get rid of them all at
3868 We need to obey setgroups() at this stage, before possibly giving up root
3869 privilege for a changed configuration file, but later on we might need to
3870 check on the additional groups for the admin user privilege - can't do that
3871 till after reading the config, which might specify the exim gid. Therefore,
3872 save the group list here first. */
3874 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3875 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3877 /* There is a fundamental difference in some BSD systems in the matter of
3878 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3879 known not to be different. On the "different" systems there is a single group
3880 list, and the first entry in it is the current group. On all other versions of
3881 Unix there is a supplementary group list, which is in *addition* to the current
3882 group. Consequently, to get rid of all extraneous groups on a "standard" system
3883 you pass over 0 groups to setgroups(), while on a "different" system you pass
3884 over a single group - the current group, which is always the first group in the
3885 list. Calling setgroups() with zero groups on a "different" system results in
3886 an error return. The following code should cope with both types of system.
3888 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3889 the "setgroups() with zero groups" - and changes the egid.
3890 Thanks to that we had to stash the original_egid above, for use below
3891 in the call to exim_setugid().
3893 However, if this process isn't running as root, setgroups() can't be used
3894 since you have to be root to run it, even if throwing away groups.
3895 Except, sigh, for Hurd - where you can.
3896 Not being root here happens only in some unusual configurations. */
3899 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3900 && setgroups(0, NULL) != 0
3902 && setgroups(1, group_list) != 0)
3903 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3905 /* If the configuration file name has been altered by an argument on the
3906 command line (either a new file name or a macro definition) and the caller is
3907 not root, or if this is a filter testing run, remove any setuid privilege the
3908 program has and run as the underlying user.
3910 The exim user is locked out of this, which severely restricts the use of -C
3913 Otherwise, set the real ids to the effective values (should be root unless run
3914 from inetd, which it can either be root or the exim uid, if one is configured).
3916 There is a private mechanism for bypassing some of this, in order to make it
3917 possible to test lots of configurations automatically, without having either to
3918 recompile each time, or to patch in an actual configuration file name and other
3919 values (such as the path name). If running in the test harness, pretend that
3920 configuration file changes and macro definitions haven't happened. */
3923 (!f.trusted_config || /* Config changed, or */
3924 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3925 real_uid != root_uid && /* Not root, and */
3926 !f.running_in_test_harness /* Not fudged */
3928 expansion_test /* expansion testing */
3930 filter_test != FTEST_NONE) /* Filter testing */
3932 setgroups(group_count, group_list);
3933 exim_setugid(real_uid, real_gid, FALSE,
3934 US"-C, -D, -be or -bf forces real uid");
3935 removed_privilege = TRUE;
3937 /* In the normal case when Exim is called like this, stderr is available
3938 and should be used for any logging information because attempts to write
3939 to the log will usually fail. To arrange this, we unset really_exim. However,
3940 if no stderr is available there is no point - we might as well have a go
3941 at the log (if it fails, syslog will be written).
3943 Note that if the invoker is Exim, the logs remain available. Messing with
3944 this causes unlogged successful deliveries. */
3946 if (log_stderr && real_uid != exim_uid)
3947 f.really_exim = FALSE;
3950 /* Privilege is to be retained for the moment. It may be dropped later,
3951 depending on the job that this Exim process has been asked to do. For now, set
3952 the real uid to the effective so that subsequent re-execs of Exim are done by a
3956 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
3958 /* If testing a filter, open the file(s) now, before wasting time doing other
3959 setups and reading the message. */
3961 if (filter_test & FTEST_SYSTEM)
3962 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
3963 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
3966 if (filter_test & FTEST_USER)
3967 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
3968 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
3971 /* Initialise lookup_list
3972 If debugging, already called above via version reporting.
3973 In either case, we initialise the list of available lookups while running
3974 as root. All dynamically modules are loaded from a directory which is
3975 hard-coded into the binary and is code which, if not a module, would be
3976 part of Exim already. Ability to modify the content of the directory
3977 is equivalent to the ability to modify a setuid binary!
3979 This needs to happen before we read the main configuration. */
3982 /*XXX this excrescence could move to the testsuite standard config setup file */
3984 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
3987 /* Read the main runtime configuration data; this gives up if there
3988 is a failure. It leaves the configuration file open so that the subsequent
3989 configuration data for delivery can be read if needed.
3991 NOTE: immediately after opening the configuration file we change the working
3992 directory to "/"! Later we change to $spool_directory. We do it there, because
3993 during readconf_main() some expansion takes place already. */
3995 /* Store the initial cwd before we change directories. Can be NULL if the
3996 dir has already been unlinked. */
3997 initial_cwd = os_getcwd(NULL, 0);
3998 if (!initial_cwd && errno)
3999 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4001 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4002 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4005 -be[m] expansion test -
4006 -b[fF] filter test new
4008 -bmalware malware_test_file new
4010 -brw rewrite test new
4012 -bv[s] address verify -
4014 -bP <option> (except -bP config, which sets list_config)
4016 If any of these options is set, we suppress warnings about configuration
4017 issues (currently about tls_advertise_hosts and keep_environment not being
4021 int old_pool = store_pool;
4022 #ifdef MEASURE_TIMING
4023 struct timeval t0, diff;
4024 (void)gettimeofday(&t0, NULL);
4027 store_pool = POOL_CONFIG;
4028 readconf_main(checking || list_options);
4029 store_pool = old_pool;
4031 #ifdef MEASURE_TIMING
4032 report_time_since(&t0, US"readconf_main (delta)");
4036 /* Now in directory "/" */
4038 if (cleanup_environment() == FALSE)
4039 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4042 /* If an action on specific messages is requested, or if a daemon or queue
4043 runner is being started, we need to know if Exim was called by an admin user.
4044 This is the case if the real user is root or exim, or if the real group is
4045 exim, or if one of the supplementary groups is exim or a group listed in
4046 admin_groups. We don't fail all message actions immediately if not admin_user,
4047 since some actions can be performed by non-admin users. Instead, set admin_user
4048 for later interrogation. */
4050 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4051 f.admin_user = TRUE;
4053 for (int i = 0; i < group_count && !f.admin_user; i++)
4054 if (group_list[i] == exim_gid)
4055 f.admin_user = TRUE;
4056 else if (admin_groups)
4057 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4058 if (admin_groups[j] == group_list[i])
4059 f.admin_user = TRUE;
4061 /* Another group of privileged users are the trusted users. These are root,
4062 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4063 are permitted to specify sender_addresses with -f on the command line, and
4064 other message parameters as well. */
4066 if (real_uid == root_uid || real_uid == exim_uid)
4067 f.trusted_caller = TRUE;
4071 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4072 if (trusted_users[i] == real_uid)
4073 f.trusted_caller = TRUE;
4076 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4077 if (trusted_groups[i] == real_gid)
4078 f.trusted_caller = TRUE;
4079 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4080 if (trusted_groups[i] == group_list[j])
4081 f.trusted_caller = TRUE;
4084 /* At this point, we know if the user is privileged and some command-line
4085 options become possibly impermissible, depending upon the configuration file. */
4087 if (checking && commandline_checks_require_admin && !f.admin_user)
4088 exim_fail("exim: those command-line flags are set to require admin\n");
4090 /* Handle the decoding of logging options. */
4092 decode_bits(log_selector, log_selector_size, log_notall,
4093 log_selector_string, log_options, log_options_count, US"log", 0);
4097 debug_printf("configuration file is %s\n", config_main_filename);
4098 debug_printf("log selectors =");
4099 for (int i = 0; i < log_selector_size; i++)
4100 debug_printf(" %08x", log_selector[i]);
4104 /* If domain literals are not allowed, check the sender address that was
4105 supplied with -f. Ditto for a stripped trailing dot. */
4109 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4110 exim_fail("exim: bad -f address \"%s\": domain literals not "
4111 "allowed\n", sender_address);
4112 if (f_end_dot && !strip_trailing_dot)
4113 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4114 "(trailing dot not allowed)\n", sender_address);
4117 /* See if an admin user overrode our logging. */
4119 if (cmdline_syslog_name)
4122 syslog_processname = cmdline_syslog_name;
4123 log_file_path = string_copy(CUS"syslog");
4126 /* not a panic, non-privileged users should not be able to spam paniclog */
4128 "exim: you lack sufficient privilege to specify syslog process name\n");
4130 /* Paranoia check of maximum lengths of certain strings. There is a check
4131 on the length of the log file path in log.c, which will come into effect
4132 if there are any calls to write the log earlier than this. However, if we
4133 get this far but the string is very long, it is better to stop now than to
4134 carry on and (e.g.) receive a message and then have to collapse. The call to
4135 log_write() from here will cause the ultimate panic collapse if the complete
4136 file name exceeds the buffer length. */
4138 if (Ustrlen(log_file_path) > 200)
4139 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4140 "log_file_path is longer than 200 chars: aborting");
4142 if (Ustrlen(pid_file_path) > 200)
4143 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4144 "pid_file_path is longer than 200 chars: aborting");
4146 if (Ustrlen(spool_directory) > 200)
4147 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4148 "spool_directory is longer than 200 chars: aborting");
4150 /* Length check on the process name given to syslog for its TAG field,
4151 which is only permitted to be 32 characters or less. See RFC 3164. */
4153 if (Ustrlen(syslog_processname) > 32)
4154 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4155 "syslog_processname is longer than 32 chars: aborting");
4160 log_write(0, LOG_MAIN, "%s", log_oneline);
4161 return EXIT_SUCCESS;
4164 return EXIT_FAILURE;
4166 /* In some operating systems, the environment variable TMPDIR controls where
4167 temporary files are created; Exim doesn't use these (apart from when delivering
4168 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4169 If TMPDIR is found in the environment, reset it to the value defined in the
4170 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4171 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4172 EXIM_TMPDIR by the build scripts.
4176 if (environ) for (uschar ** p = USS environ; *p; p++)
4177 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4179 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4180 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4182 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4186 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4187 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4188 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4189 called by a user who has set the TZ variable. This then affects the timestamps
4190 in log files and in Received: headers, and any created Date: header lines. The
4191 required timezone is settable in the configuration file, so nothing can be done
4192 about this earlier - but hopefully nothing will normally be logged earlier than
4193 this. We have to make a new environment if TZ is wrong, but don't bother if
4194 timestamps_utc is set, because then all times are in UTC anyway. */
4196 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4197 f.timestamps_utc = TRUE;
4200 uschar *envtz = US getenv("TZ");
4202 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4203 : timezone_string != NULL
4206 uschar **p = USS environ;
4210 if (environ) while (*p++) count++;
4211 if (!envtz) count++;
4212 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4213 if (environ) for (p = USS environ; *p; p++)
4214 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4215 if (timezone_string)
4217 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4218 sprintf(CS *newp++, "TZ=%s", timezone_string);
4223 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4224 tod_stamp(tod_log));
4228 /* Handle the case when we have removed the setuid privilege because of -C or
4229 -D. This means that the caller of Exim was not root.
4231 There is a problem if we were running as the Exim user. The sysadmin may
4232 expect this case to retain privilege because "the binary was called by the
4233 Exim user", but it hasn't, because either the -D option set macros, or the
4234 -C option set a non-trusted configuration file. There are two possibilities:
4236 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4237 to do message deliveries. Thus, the fact that it is running as a
4238 non-privileged user is plausible, and might be wanted in some special
4239 configurations. However, really_exim will have been set false when
4240 privilege was dropped, to stop Exim trying to write to its normal log
4241 files. Therefore, re-enable normal log processing, assuming the sysadmin
4242 has set up the log directory correctly.
4244 (2) If deliver_drop_privilege is not set, the configuration won't work as
4245 apparently intended, and so we log a panic message. In order to retain
4246 root for -C or -D, the caller must either be root or be invoking a
4247 trusted configuration file (when deliver_drop_privilege is false). */
4249 if ( removed_privilege
4250 && (!f.trusted_config || opt_D_used)
4251 && real_uid == exim_uid)
4252 if (deliver_drop_privilege)
4253 f.really_exim = TRUE; /* let logging work normally */
4255 log_write(0, LOG_MAIN|LOG_PANIC,
4256 "exim user lost privilege for using %s option",
4257 f.trusted_config? "-D" : "-C");
4259 /* Start up Perl interpreter if Perl support is configured and there is a
4260 perl_startup option, and the configuration or the command line specifies
4261 initializing starting. Note that the global variables are actually called
4262 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4265 if (perl_start_option != 0)
4266 opt_perl_at_start = (perl_start_option > 0);
4267 if (opt_perl_at_start && opt_perl_startup != NULL)
4270 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4271 if ((errstr = init_perl(opt_perl_startup)))
4272 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4273 opt_perl_started = TRUE;
4275 #endif /* EXIM_PERL */
4277 /* Log the arguments of the call if the configuration file said so. This is
4278 a debugging feature for finding out what arguments certain MUAs actually use.
4279 Don't attempt it if logging is disabled, or if listing variables or if
4280 verifying/testing addresses or expansions. */
4282 if ( (debug_selector & D_any || LOGGING(arguments))
4283 && f.really_exim && !list_options && !checking)
4285 uschar *p = big_buffer;
4286 Ustrcpy(p, US"cwd= (failed)");
4293 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4294 p += Ustrlen(CCS p);
4297 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4299 for (int i = 0; i < argc; i++)
4301 int len = Ustrlen(argv[i]);
4302 const uschar *printing;
4304 if (p + len + 8 >= big_buffer + big_buffer_size)
4306 Ustrcpy(p, US" ...");
4307 log_write(0, LOG_MAIN, "%s", big_buffer);
4308 Ustrcpy(big_buffer, US"...");
4311 printing = string_printing(argv[i]);
4312 if (!*printing) quote = US"\"";
4315 const uschar *pp = printing;
4317 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4319 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4320 (p - big_buffer) - 4), printing, quote);
4323 if (LOGGING(arguments))
4324 log_write(0, LOG_MAIN, "%s", big_buffer);
4326 debug_printf("%s\n", big_buffer);
4329 /* Set the working directory to be the top-level spool directory. We don't rely
4330 on this in the code, which always uses fully qualified names, but it's useful
4331 for core dumps etc. Don't complain if it fails - the spool directory might not
4332 be generally accessible and calls with the -C option (and others) have lost
4333 privilege by now. Before the chdir, we try to ensure that the directory exists.
4336 if (Uchdir(spool_directory) != 0)
4338 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4339 (void) Uchdir(spool_directory);
4342 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4343 alias file. Exim doesn't have such a concept, but this call is screwed into
4344 Sun's YP makefiles. Handle this by calling a configured script, as the real
4345 user who called Exim. The -oA option can be used to pass an argument to the
4350 (void) fclose(config_file);
4351 if (bi_command && *bi_command)
4355 argv[i++] = bi_command;
4356 if (alias_arg) argv[i++] = alias_arg;
4359 setgroups(group_count, group_list);
4360 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4362 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4363 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4365 execv(CS argv[0], (char *const *)argv);
4366 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4370 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4375 /* We moved the admin/trusted check to be immediately after reading the
4376 configuration file. We leave these prints here to ensure that syslog setup,
4377 logfile setup, and so on has already happened. */
4379 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4380 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4382 /* Only an admin user may start the daemon or force a queue run in the default
4383 configuration, but the queue run restriction can be relaxed. Only an admin
4384 user may request that a message be returned to its sender forthwith. Only an
4385 admin user may specify a debug level greater than D_v (because it might show
4386 passwords, etc. in lookup queries). Only an admin user may request a queue
4387 count. Only an admin user can use the test interface to scan for email
4388 (because Exim will be in the spool dir and able to look at mails). */
4392 BOOL debugset = (debug_selector & ~D_v) != 0;
4393 if ( deliver_give_up || f.daemon_listen || malware_test_file
4394 || count_queue && queue_list_requires_admin
4395 || list_queue && queue_list_requires_admin
4396 || queue_interval >= 0 && prod_requires_admin
4397 || queue_name_dest && prod_requires_admin
4398 || debugset && !f.running_in_test_harness
4400 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4403 /* If the real user is not root or the exim uid, the argument for passing
4404 in an open TCP/IP connection for another message is not permitted, nor is
4405 running with the -N option for any delivery action, unless this call to exim is
4406 one that supplied an input message, or we are using a patched exim for
4407 regression testing. */
4409 if ( real_uid != root_uid && real_uid != exim_uid
4410 && ( continue_hostname
4412 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4414 && !f.running_in_test_harness
4416 exim_fail("exim: Permission denied\n");
4418 /* If the caller is not trusted, certain arguments are ignored when running for
4419 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4420 Note that authority for performing certain actions on messages is tested in the
4421 queue_action() function. */
4423 if (!f.trusted_caller && !checking)
4425 sender_host_name = sender_host_address = interface_address =
4426 sender_ident = received_protocol = NULL;
4427 sender_host_port = interface_port = 0;
4428 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4431 /* If a sender host address is set, extract the optional port number off the
4432 end of it and check its syntax. Do the same thing for the interface address.
4433 Exim exits if the syntax is bad. */
4437 if (sender_host_address)
4438 sender_host_port = check_port(sender_host_address);
4439 if (interface_address)
4440 interface_port = check_port(interface_address);
4443 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4446 if (f.trusted_caller)
4448 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4449 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4452 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4455 /* If an SMTP message is being received check to see if the standard input is a
4456 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4457 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4462 union sockaddr_46 inetd_sock;
4463 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4464 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4466 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4467 if (family == AF_INET || family == AF_INET6)
4469 union sockaddr_46 interface_sock;
4470 size = sizeof(interface_sock);
4472 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4473 interface_address = host_ntoa(-1, &interface_sock, NULL,
4476 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4478 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4481 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4482 NULL, &sender_host_port);
4483 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4484 "inetd is not supported when mua_wrapper is set");
4488 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4493 /* If the load average is going to be needed while receiving a message, get it
4494 now for those OS that require the first call to os_getloadavg() to be done as
4495 root. There will be further calls later for each message received. */
4497 #ifdef LOAD_AVG_NEEDS_ROOT
4498 if ( receiving_message
4499 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4500 load_average = OS_GETLOADAVG();
4503 /* The queue_only configuration option can be overridden by -odx on the command
4504 line, except that if queue_only_override is false, queue_only cannot be unset
4505 from the command line. */
4507 if (queue_only_set && (queue_only_override || arg_queue_only))
4508 queue_only = arg_queue_only;
4510 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4513 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4514 if (arg_smtp_receive_timeout >= 0)
4515 smtp_receive_timeout = arg_smtp_receive_timeout;
4517 /* If Exim was started with root privilege, unless we have already removed the
4518 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4519 except when starting the daemon or doing some kind of delivery or address
4520 testing (-bt). These are the only cases when root need to be retained. We run
4521 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4522 retained only for starting the daemon. We always do the initgroups() in this
4523 situation (controlled by the TRUE below), in order to be as close as possible
4524 to the state Exim usually runs in. */
4526 if ( !unprivileged /* originally had root AND */
4527 && !removed_privilege /* still got root AND */
4528 && !f.daemon_listen /* not starting the daemon */
4529 && queue_interval <= 0 /* (either kind of daemon) */
4530 && ( /* AND EITHER */
4531 deliver_drop_privilege /* requested unprivileged */
4533 queue_interval < 0 /* not running the queue */
4534 && ( msg_action_arg < 0 /* and */
4535 || msg_action != MSG_DELIVER /* not delivering */
4537 && (!checking || !f.address_test_mode) /* not address checking */
4538 && !rcpt_verify_quota /* and not quota checking */
4540 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4542 /* When we are retaining a privileged uid, we still change to the exim gid. */
4547 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4548 rv = setgid(exim_gid);
4549 /* Impact of failure is that some stuff might end up with an incorrect group.
4550 We track this for failures from root, since any attempt to change privilege
4551 by root should succeed and failures should be examined. For non-root,
4552 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4553 no need to complain then. */
4555 if (!(unprivileged || removed_privilege))
4556 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4559 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4560 (long int)exim_gid, strerror(errno));
4564 /* Handle a request to scan a file for malware */
4565 if (malware_test_file)
4567 #ifdef WITH_CONTENT_SCAN
4569 set_process_info("scanning file for malware");
4570 if ((result = malware_in_file(malware_test_file)) == FAIL)
4572 printf("No malware found.\n");
4577 printf("Malware lookup returned non-okay/fail: %d\n", result);
4581 printf("Malware found: %s\n", malware_name);
4583 printf("Malware scan detected malware of unknown name.\n");
4585 printf("Malware scanning not enabled at compile time.\n");
4590 /* Handle a request to list the delivery queue */
4594 set_process_info("listing the queue");
4595 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4599 /* Handle a request to count the delivery queue */
4603 set_process_info("counting the queue");
4604 fprintf(stdout, "%u\n", queue_count());
4608 /* Handle actions on specific messages, except for the force delivery and
4609 message load actions, which are done below. Some actions take a whole list of
4610 message ids, which are known to continue up to the end of the arguments. Others
4611 take a single message id and then operate on the recipients list. */
4613 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4615 int yield = EXIT_SUCCESS;
4616 set_process_info("acting on specified messages");
4618 /* ACL definitions may be needed when removing a message (-Mrm) because
4619 event_action gets expanded */
4621 if (msg_action == MSG_REMOVE)
4623 int old_pool = store_pool;
4624 store_pool = POOL_CONFIG;
4626 store_pool = old_pool;
4627 store_writeprotect(POOL_CONFIG);
4630 if (!one_msg_action)
4632 for (i = msg_action_arg; i < argc; i++)
4633 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4634 yield = EXIT_FAILURE;
4637 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4638 default: printf("\n"); break;
4642 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4643 recipients_arg)) yield = EXIT_FAILURE;
4647 /* We used to set up here to skip reading the ACL section, on
4648 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4649 Now, since the intro of the ${acl } expansion, ACL definitions may be
4650 needed in transports so we lost the optimisation. */
4653 int old_pool = store_pool;
4654 #ifdef MEASURE_TIMING
4655 struct timeval t0, diff;
4656 (void)gettimeofday(&t0, NULL);
4659 store_pool = POOL_CONFIG;
4661 store_pool = old_pool;
4663 /* -be can add macro definitions, needing to link to the macro structure
4664 chain. Otherwise, make the memory used for config data readonly. */
4666 if (!expansion_test)
4667 store_writeprotect(POOL_CONFIG);
4669 #ifdef MEASURE_TIMING
4670 report_time_since(&t0, US"readconf_rest (delta)");
4674 /* Handle a request to check quota */
4675 if (rcpt_verify_quota)
4676 if (real_uid != root_uid && real_uid != exim_uid)
4677 exim_fail("exim: Permission denied\n");
4678 else if (recipients_arg >= argc)
4679 exim_fail("exim: missing recipient for quota check\n");
4682 verify_quota(argv[recipients_arg]);
4683 exim_exit(EXIT_SUCCESS);
4686 /* Handle the -brt option. This is for checking out retry configurations.
4687 The next three arguments are a domain name or a complete address, and
4688 optionally two error numbers. All it does is to call the function that
4689 scans the retry configuration data. */
4691 if (test_retry_arg >= 0)
4693 retry_config *yield;
4694 int basic_errno = 0;
4696 const uschar *s1, *s2;
4698 if (test_retry_arg >= argc)
4700 printf("-brt needs a domain or address argument\n");
4701 exim_exit(EXIT_FAILURE);
4703 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4706 /* If the first argument contains no @ and no . it might be a local user
4707 or it might be a single-component name. Treat as a domain. */
4709 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4711 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4712 "being \ntreated as a one-component domain, not as a local part.\n\n",
4716 /* There may be an optional second domain arg. */
4718 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4719 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4721 /* The final arg is an error name */
4723 if (test_retry_arg < argc)
4725 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4727 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4730 printf("%s\n", CS error);
4731 return EXIT_FAILURE;
4734 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4735 code > 100 as an error is for matching codes to the decade. Turn them into
4736 a real error code, off the decade. */
4738 if (basic_errno == ERRNO_MAIL4XX ||
4739 basic_errno == ERRNO_RCPT4XX ||
4740 basic_errno == ERRNO_DATA4XX)
4742 int code = (more_errno >> 8) & 255;
4744 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4745 else if (code > 100)
4746 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4750 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4751 printf("No retry information found\n");
4754 more_errno = yield->more_errno;
4755 printf("Retry rule: %s ", yield->pattern);
4757 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4759 printf("quota%s%s ",
4760 (more_errno > 0)? "_" : "",
4761 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4763 else if (yield->basic_errno == ECONNREFUSED)
4765 printf("refused%s%s ",
4766 (more_errno > 0)? "_" : "",
4767 (more_errno == 'M')? "MX" :
4768 (more_errno == 'A')? "A" : "");
4770 else if (yield->basic_errno == ETIMEDOUT)
4773 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4775 if (more_errno != 0) printf("_%s",
4776 (more_errno == 'M')? "MX" : "A");
4779 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4780 printf("auth_failed ");
4783 for (retry_rule * r = yield->rules; r; r = r->next)
4785 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4786 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4792 printf(",%d.", x/1000);
4806 exim_exit(EXIT_SUCCESS);
4809 /* Handle a request to list one or more configuration options */
4810 /* If -n was set, we suppress some information */
4815 set_process_info("listing variables");
4816 if (recipients_arg >= argc)
4817 fail = !readconf_print(US"all", NULL, flag_n);
4818 else for (i = recipients_arg; i < argc; i++)
4821 (Ustrcmp(argv[i], "router") == 0 ||
4822 Ustrcmp(argv[i], "transport") == 0 ||
4823 Ustrcmp(argv[i], "authenticator") == 0 ||
4824 Ustrcmp(argv[i], "macro") == 0 ||
4825 Ustrcmp(argv[i], "environment") == 0))
4827 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4831 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4833 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4838 set_process_info("listing config");
4839 exim_exit(readconf_print(US"config", NULL, flag_n)
4840 ? EXIT_SUCCESS : EXIT_FAILURE);
4844 /* Initialise subsystems as required. */
4848 /* Handle a request to deliver one or more messages that are already on the
4849 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4850 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4852 Delivery of specific messages is typically used for a small number when
4853 prodding by hand (when the option forced_delivery will be set) or when
4854 re-execing to regain root privilege. Each message delivery must happen in a
4855 separate process, so we fork a process for each one, and run them sequentially
4856 so that debugging output doesn't get intertwined, and to avoid spawning too
4857 many processes if a long list is given. However, don't fork for the last one;
4858 this saves a process in the common case when Exim is called to deliver just one
4861 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4863 if (prod_requires_admin && !f.admin_user)
4865 fprintf(stderr, "exim: Permission denied\n");
4866 exim_exit(EXIT_FAILURE);
4868 set_process_info("delivering specified messages");
4869 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4870 for (i = msg_action_arg; i < argc; i++)
4874 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4875 that runs into a later copy into the untainted global message_id[] */
4876 /*XXX Do we need a length limit check here? */
4878 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4879 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4881 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4882 exim_underbar_exit(EXIT_SUCCESS);
4886 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4888 exim_exit(EXIT_FAILURE);
4892 exim_exit(EXIT_SUCCESS);
4896 /* If only a single queue run is requested, without SMTP listening, we can just
4897 turn into a queue runner, with an optional starting message id. */
4899 if (queue_interval == 0 && !f.daemon_listen)
4901 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4902 start_queue_run_id ? US" starting at " : US"",
4903 start_queue_run_id ? start_queue_run_id: US"",
4904 stop_queue_run_id ? US" stopping at " : US"",
4905 stop_queue_run_id ? stop_queue_run_id : US"");
4907 set_process_info("running the '%s' queue (single queue run)", queue_name);
4909 set_process_info("running the queue (single queue run)");
4910 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4911 exim_exit(EXIT_SUCCESS);
4915 /* Find the login name of the real user running this process. This is always
4916 needed when receiving a message, because it is written into the spool file. It
4917 may also be used to construct a from: or a sender: header, and in this case we
4918 need the user's full name as well, so save a copy of it, checked for RFC822
4919 syntax and munged if necessary, if it hasn't previously been set by the -F
4920 argument. We may try to get the passwd entry more than once, in case NIS or
4921 other delays are in evidence. Save the home directory for use in filter testing
4926 if ((pw = getpwuid(real_uid)) != NULL)
4928 originator_login = string_copy(US pw->pw_name);
4929 originator_home = string_copy(US pw->pw_dir);
4931 /* If user name has not been set by -F, set it from the passwd entry
4932 unless -f has been used to set the sender address by a trusted user. */
4934 if (!originator_name)
4936 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4938 uschar *name = US pw->pw_gecos;
4939 uschar *amp = Ustrchr(name, '&');
4942 /* Most Unix specify that a '&' character in the gecos field is
4943 replaced by a copy of the login name, and some even specify that
4944 the first character should be upper cased, so that's what we do. */
4949 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4950 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4951 buffer[loffset] = toupper(buffer[loffset]);
4955 /* If a pattern for matching the gecos field was supplied, apply
4956 it and then expand the name string. */
4958 if (gecos_pattern && gecos_name)
4960 const pcre2_code *re;
4961 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4963 if (regex_match_and_setup(re, name, 0, -1))
4965 uschar *new_name = expand_string(gecos_name);
4969 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4970 "gecos field \"%s\"\n", new_name, name);
4973 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4974 "\"%s\": %s\n", gecos_name, expand_string_message);
4976 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4977 "gecos field \"%s\"\n", gecos_pattern, name);
4978 store_free((void *)re);
4980 originator_name = string_copy(name);
4983 /* A trusted caller has used -f but not -F */
4985 else originator_name = US"";
4988 /* Break the retry loop */
4993 if (++i > finduser_retries) break;
4997 /* If we cannot get a user login, log the incident and give up, unless the
4998 configuration specifies something to use. When running in the test harness,
4999 any setting of unknown_login overrides the actual name. */
5001 if (!originator_login || f.running_in_test_harness)
5005 originator_login = expand_string(unknown_login);
5006 if (!originator_name && unknown_username)
5007 originator_name = expand_string(unknown_username);
5008 if (!originator_name) originator_name = US"";
5010 if (!originator_login)
5011 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5015 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5018 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5020 /* If a message is created by this call of Exim, the uid/gid of its originator
5021 are those of the caller. These values are overridden if an existing message is
5022 read in from the spool. */
5024 originator_uid = real_uid;
5025 originator_gid = real_gid;
5027 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5028 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5030 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5031 returns. We leave this till here so that the originator_ fields are available
5032 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5035 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5039 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5040 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5041 "mua_wrapper is set");
5044 # ifndef DISABLE_TLS
5045 /* This also checks that the library linkage is working and we can call
5046 routines in it, so call even if tls_require_ciphers is unset */
5048 # ifdef MEASURE_TIMING
5049 struct timeval t0, diff;
5050 (void)gettimeofday(&t0, NULL);
5052 if (!tls_dropprivs_validate_require_cipher(FALSE))
5054 # ifdef MEASURE_TIMING
5055 report_time_since(&t0, US"validate_ciphers (delta)");
5063 /* If the sender ident has not been set (by a trusted caller) set it to
5064 the caller. This will get overwritten below for an inetd call. If a trusted
5065 caller has set it empty, unset it. */
5067 if (!sender_ident) sender_ident = originator_login;
5068 else if (!*sender_ident) sender_ident = NULL;
5070 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5071 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5072 originator_* variables set. */
5074 if (test_rewrite_arg >= 0)
5076 f.really_exim = FALSE;
5077 if (test_rewrite_arg >= argc)
5079 printf("-brw needs an address argument\n");
5080 exim_exit(EXIT_FAILURE);
5082 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5083 exim_exit(EXIT_SUCCESS);
5086 /* A locally-supplied message is considered to be coming from a local user
5087 unless a trusted caller supplies a sender address with -f, or is passing in the
5088 message via SMTP (inetd invocation or otherwise). */
5090 if ( !sender_address && !smtp_input
5091 || !f.trusted_caller && filter_test == FTEST_NONE)
5093 f.sender_local = TRUE;
5095 /* A trusted caller can supply authenticated_sender and authenticated_id
5096 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5097 defaults except when host checking. */
5099 if (!authenticated_sender && !host_checking)
5100 authenticated_sender = string_sprintf("%s@%s", originator_login,
5101 qualify_domain_sender);
5102 if (!authenticated_id && !host_checking)
5103 authenticated_id = originator_login;
5106 /* Trusted callers are always permitted to specify the sender address.
5107 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5108 is specified is the empty address. However, if a trusted caller does not
5109 specify a sender address for SMTP input, we leave sender_address unset. This
5110 causes the MAIL commands to be honoured. */
5112 if ( !smtp_input && !sender_address
5113 || !receive_check_set_sender(sender_address))
5115 /* Either the caller is not permitted to set a general sender, or this is
5116 non-SMTP input and the trusted caller has not set a sender. If there is no
5117 sender, or if a sender other than <> is set, override with the originator's
5118 login (which will get qualified below), except when checking things. */
5120 if ( !sender_address /* No sender_address set */
5122 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5123 !checking)) /* Not running tests, including filter tests */
5125 sender_address = originator_login;
5126 f.sender_address_forced = FALSE;
5127 sender_address_domain = 0;
5131 /* Remember whether an untrusted caller set the sender address */
5133 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5135 /* Ensure that the sender address is fully qualified unless it is the empty
5136 address, which indicates an error message, or doesn't exist (root caller, smtp
5137 interface, no -f argument). */
5139 if (sender_address && *sender_address && sender_address_domain == 0)
5140 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5141 qualify_domain_sender);
5143 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5145 /* Handle a request to verify a list of addresses, or test them for delivery.
5146 This must follow the setting of the sender address, since routers can be
5147 predicated upon the sender. If no arguments are given, read addresses from
5148 stdin. Set debug_level to at least D_v to get full output for address testing.
5151 if (verify_address_mode || f.address_test_mode)
5154 int flags = vopt_qualify;
5156 if (verify_address_mode)
5158 if (!verify_as_sender) flags |= vopt_is_recipient;
5159 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5164 flags |= vopt_is_recipient;
5165 debug_selector |= D_v;
5166 debug_file = stderr;
5167 debug_fd = fileno(debug_file);
5168 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5171 if (recipients_arg < argc)
5172 while (recipients_arg < argc)
5174 /* Supplied addresses are tainted since they come from a user */
5175 uschar * s = string_copy_taint(exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"), TRUE);
5178 BOOL finished = FALSE;
5179 uschar *ss = parse_find_address_end(s, FALSE);
5180 if (*ss == ',') *ss = 0; else finished = TRUE;
5181 test_address(s, flags, &exit_value);
5184 while (*++s == ',' || isspace(*s)) ;
5190 uschar * s = get_stdinput(NULL, NULL);
5192 test_address(string_copy_taint(exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"), TRUE), flags, &exit_value);
5196 exim_exit(exit_value);
5199 /* Handle expansion checking. Either expand items on the command line, or read
5200 from stdin if there aren't any. If -Mset was specified, load the message so
5201 that its variables can be used, but restrict this facility to admin users.
5202 Otherwise, if -bem was used, read a message from stdin. */
5206 dns_init(FALSE, FALSE, FALSE);
5207 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5211 exim_fail("exim: permission denied\n");
5212 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5213 /* Checking the length of the ID is sufficient to validate it.
5214 Get an untainted version so file opens can be done. */
5215 message_id = string_copy_taint(message_id, FALSE);
5217 spoolname = string_sprintf("%s-H", message_id);
5218 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5219 printf ("Failed to load message datafile %s\n", message_id);
5220 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5221 printf ("Failed to load message %s\n", message_id);
5224 /* Read a test message from a file. We fudge it up to be on stdin, saving
5225 stdin itself for later reading of expansion strings. */
5227 else if (expansion_test_message)
5229 int save_stdin = dup(0);
5230 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5232 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5235 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5236 message_ended = END_NOTENDED;
5237 read_message_body(receive_msg(extract_recipients));
5238 message_linecount += body_linecount;
5239 (void)dup2(save_stdin, 0);
5240 (void)close(save_stdin);
5241 clearerr(stdin); /* Required by Darwin */
5244 /* Only admin users may see config-file macros this way */
5246 if (!f.admin_user) macros_user = macros = mlast = NULL;
5248 /* Allow $recipients for this testing */
5250 f.enable_dollar_recipients = TRUE;
5252 /* Expand command line items */
5254 if (recipients_arg < argc)
5255 while (recipients_arg < argc)
5256 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5262 char *(*fn_readline)(const char *) = NULL;
5263 void (*fn_addhist)(const char *) = NULL;
5267 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5270 while (s = get_stdinput(fn_readline, fn_addhist))
5271 expansion_test_line(s);
5274 if (dlhandle) dlclose(dlhandle);
5278 /* The data file will be open after -Mset */
5280 if (deliver_datafile >= 0)
5282 (void)close(deliver_datafile);
5283 deliver_datafile = -1;
5286 exim_exit(EXIT_SUCCESS);
5290 /* The active host name is normally the primary host name, but it can be varied
5291 for hosts that want to play several parts at once. We need to ensure that it is
5292 set for host checking, and for receiving messages. */
5294 smtp_active_hostname = primary_hostname;
5295 if (raw_active_hostname != NULL)
5297 uschar *nah = expand_string(raw_active_hostname);
5300 if (!f.expand_string_forcedfail)
5301 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5302 "(smtp_active_hostname): %s", raw_active_hostname,
5303 expand_string_message);
5305 else if (nah[0] != 0) smtp_active_hostname = nah;
5308 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5309 given IP address so that the blocking and relay configuration can be tested.
5310 Unless a sender_ident was set by -oMt, we discard it (the default is the
5311 caller's login name). An RFC 1413 call is made only if we are running in the
5312 test harness and an incoming interface and both ports are specified, because
5313 there is no TCP/IP call to find the ident for. */
5320 if (!sender_ident_set)
5322 sender_ident = NULL;
5323 if (f.running_in_test_harness && sender_host_port
5324 && interface_address && interface_port)
5325 verify_get_ident(1223); /* note hardwired port number */
5328 /* In case the given address is a non-canonical IPv6 address, canonicalize
5329 it. The code works for both IPv4 and IPv6, as it happens. */
5331 size = host_aton(sender_host_address, x);
5332 sender_host_address = store_get(48, FALSE); /* large enough for full IPv6 */
5333 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5335 /* Now set up for testing */
5337 host_build_sender_fullhost();
5341 f.sender_local = FALSE;
5342 f.sender_host_notsocket = TRUE;
5343 debug_file = stderr;
5344 debug_fd = fileno(debug_file);
5345 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5346 "**** but without any ident (RFC 1413) callback.\n"
5347 "**** This is not for real!\n\n",
5348 sender_host_address);
5350 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5351 if (verify_check_host(&hosts_connection_nolog) == OK)
5352 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5353 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5355 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5356 because a log line has already been written for all its failure exists
5357 (usually "connection refused: <reason>") and writing another one is
5358 unnecessary clutter. */
5360 if (smtp_start_session())
5363 for (; (reset_point = store_mark()); store_reset(reset_point))
5365 if (smtp_setup_msg() <= 0) break;
5366 if (!receive_msg(FALSE)) break;
5368 return_path = sender_address = NULL;
5369 dnslist_domain = dnslist_matched = NULL;
5370 #ifndef DISABLE_DKIM
5371 dkim_cur_signer = NULL;
5374 deliver_localpart_orig = NULL;
5375 deliver_domain_orig = NULL;
5376 callout_address = sending_ip_address = NULL;
5377 deliver_localpart_data = deliver_domain_data =
5378 recipient_data = sender_data = NULL;
5379 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5383 exim_exit(EXIT_SUCCESS);
5387 /* Arrange for message reception if recipients or SMTP were specified;
5388 otherwise complain unless a version print (-bV) happened or this is a filter
5389 verification test or info dump.
5390 In the former case, show the configuration file name. */
5392 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5394 if (version_printed)
5396 if (Ustrchr(config_main_filelist, ':'))
5397 printf("Configuration file search path is %s\n", config_main_filelist);
5398 printf("Configuration file is %s\n", config_main_filename);
5399 return EXIT_SUCCESS;
5402 if (info_flag != CMDINFO_NONE)
5404 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5405 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5408 if (filter_test == FTEST_NONE)
5409 exim_usage(called_as);
5413 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5414 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5415 that we are not called from inetd, because that is rejected above. The
5416 following configuration settings are forced here:
5418 (1) Synchronous delivery (-odi)
5419 (2) Errors to stderr (-oep == -oeq)
5420 (3) No parallel remote delivery
5421 (4) Unprivileged delivery
5423 We don't force overall queueing options because there are several of them;
5424 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5425 to override any SMTP queueing. */
5429 f.synchronous_delivery = TRUE;
5430 arg_error_handling = ERRORS_STDERR;
5431 remote_max_parallel = 1;
5432 deliver_drop_privilege = TRUE;
5433 f.queue_smtp = FALSE;
5434 queue_smtp_domains = NULL;
5436 message_utf8_downconvert = -1; /* convert-if-needed */
5441 /* Prepare to accept one or more new messages on the standard input. When a
5442 message has been read, its id is returned in message_id[]. If doing immediate
5443 delivery, we fork a delivery process for each received message, except for the
5444 last one, where we can save a process switch.
5446 It is only in non-smtp mode that error_handling is allowed to be changed from
5447 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5448 sendmail error modes other than -oem ever actually used? Later: yes.) */
5450 if (!smtp_input) error_handling = arg_error_handling;
5452 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5453 logging being sent down the socket and make an identd call to get the
5456 else if (f.is_inetd)
5458 (void)fclose(stderr);
5459 exim_nullstd(); /* Re-open to /dev/null */
5460 verify_get_ident(IDENT_PORT);
5461 host_build_sender_fullhost();
5462 set_process_info("handling incoming connection from %s via inetd",
5466 /* If the sender host address has been set, build sender_fullhost if it hasn't
5467 already been done (which it will have been for inetd). This caters for the
5468 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5469 so that the test for IP options is skipped for -bs input. */
5471 if (sender_host_address && !sender_fullhost)
5473 host_build_sender_fullhost();
5474 set_process_info("handling incoming connection from %s via -oMa",
5476 f.sender_host_notsocket = TRUE;
5479 /* Otherwise, set the sender host as unknown except for inetd calls. This
5480 prevents host checking in the case of -bs not from inetd and also for -bS. */
5482 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5484 /* If stdout does not exist, then dup stdin to stdout. This can happen
5485 if exim is started from inetd. In this case fd 0 will be set to the socket,
5486 but fd 1 will not be set. This also happens for passed SMTP channels. */
5488 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5490 /* Set up the incoming protocol name and the state of the program. Root is
5491 allowed to force received protocol via the -oMr option above. If we have come
5492 via inetd, the process info has already been set up. We don't set
5493 received_protocol here for smtp input, as it varies according to
5494 batch/HELO/EHLO/AUTH/TLS. */
5498 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5499 smtp_batched_input? "batched " : "",
5500 sender_address ? sender_address : originator_login);
5504 int old_pool = store_pool;
5505 store_pool = POOL_PERM;
5506 if (!received_protocol)
5507 received_protocol = string_sprintf("local%s", called_as);
5508 store_pool = old_pool;
5509 set_process_info("accepting a local non-SMTP message from <%s>",
5513 /* Initialize the session_local_queue-only flag (this will be ignored if
5514 mua_wrapper is set) */
5517 session_local_queue_only = queue_only;
5519 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5520 the spool if so configured. On failure, we must not attempt to send an error
5521 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5522 error code is given.) */
5524 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5525 exim_fail("exim: insufficient disk space\n");
5527 /* If this is smtp input of any kind, real or batched, handle the start of the
5530 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5531 because a log line has already been written for all its failure exists
5532 (usually "connection refused: <reason>") and writing another one is
5533 unnecessary clutter. */
5539 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5540 if (verify_check_host(&hosts_connection_nolog) == OK)
5541 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5542 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5543 if (!smtp_start_session())
5546 exim_exit(EXIT_SUCCESS);
5550 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5551 (we handle buferring so as to have visibility of fill level). */
5555 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5556 if (expand_string_message)
5557 if (thismessage_size_limit == -1)
5558 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5559 "message_size_limit: %s", expand_string_message);
5561 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5562 "message_size_limit: %s", expand_string_message);
5564 setvbuf(stdin, NULL, _IONBF, 0);
5567 /* Loop for several messages when reading SMTP input. If we fork any child
5568 processes, we don't want to wait for them unless synchronous delivery is
5569 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5570 same as SIG_DFL, despite the fact that documentation often lists the default as
5571 "ignore". This is a confusing area. This is what I know:
5573 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5574 processes that complete simply to go away without ever becoming defunct. You
5575 can't then wait for them - but we don't want to wait for them in the
5576 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5577 happen for all OS (e.g. *BSD is different).
5579 But that's not the end of the story. Some (many? all?) systems have the
5580 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5581 has by default, so it seems that the difference is merely one of default
5582 (compare restarting vs non-restarting signals).
5584 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5585 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5586 of the loop below. Paranoia rules.
5588 February 2003: That's *still* not the end of the story. There are now versions
5589 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5590 process then calls waitpid(), a grumble is written to the system log, because
5591 this is logically inconsistent. In other words, it doesn't like the paranoia.
5592 As a consequence of this, the waitpid() below is now excluded if we are sure
5593 that SIG_IGN works. */
5595 if (!f.synchronous_delivery)
5598 struct sigaction act;
5599 act.sa_handler = SIG_IGN;
5600 sigemptyset(&(act.sa_mask));
5601 act.sa_flags = SA_NOCLDWAIT;
5602 sigaction(SIGCHLD, &act, NULL);
5604 signal(SIGCHLD, SIG_IGN);
5608 /* Save the current store pool point, for resetting at the start of
5609 each message, and save the real sender address, if any. */
5611 real_sender_address = sender_address;
5613 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5614 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5617 for (BOOL more = TRUE; more; )
5619 rmark reset_point = store_mark();
5622 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5623 input and build the recipients list, before calling receive_msg() to read the
5624 message proper. Whatever sender address is given in the SMTP transaction is
5625 often ignored for local senders - we use the actual sender, which is normally
5626 either the underlying user running this process or a -f argument provided by
5627 a trusted caller. It is saved in real_sender_address. The test for whether to
5628 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5633 if ((rc = smtp_setup_msg()) > 0)
5635 if (real_sender_address != NULL &&
5636 !receive_check_set_sender(sender_address))
5638 sender_address = raw_sender = real_sender_address;
5639 sender_address_unrewritten = NULL;
5642 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5643 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5644 the very end. The result of the ACL is ignored (as for other non-SMTP
5645 messages). It is run for its potential side effects. */
5647 if (smtp_batched_input && acl_not_smtp_start != NULL)
5649 uschar *user_msg, *log_msg;
5650 f.enable_dollar_recipients = TRUE;
5651 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5652 &user_msg, &log_msg);
5653 f.enable_dollar_recipients = FALSE;
5656 /* Now get the data for the message */
5658 more = receive_msg(extract_recipients);
5661 cancel_cutthrough_connection(TRUE, US"receive dropped");
5662 if (more) goto MORELOOP;
5663 smtp_log_no_mail(); /* Log no mail if configured */
5664 exim_exit(EXIT_FAILURE);
5669 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5670 smtp_log_no_mail(); /* Log no mail if configured */
5671 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5675 /* In the non-SMTP case, we have all the information from the command
5676 line, but must process it in case it is in the more general RFC822
5677 format, and in any case, to detect syntax errors. Also, it appears that
5678 the use of comma-separated lists as single arguments is common, so we
5679 had better support them. */
5684 int count = argc - recipients_arg;
5685 uschar **list = argv + recipients_arg;
5687 /* These options cannot be changed dynamically for non-SMTP messages */
5689 f.active_local_sender_retain = local_sender_retain;
5690 f.active_local_from_check = local_from_check;
5692 /* Save before any rewriting */
5694 raw_sender = string_copy(sender_address);
5696 /* Loop for each argument (supplied by user hence tainted) */
5698 for (int i = 0; i < count; i++)
5700 int start, end, domain;
5702 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5703 * We'll still want to cap it to something, just in case. */
5704 uschar * s = string_copy_taint(exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"), TRUE);
5706 /* Loop for each comma-separated address */
5710 BOOL finished = FALSE;
5712 uschar *ss = parse_find_address_end(s, FALSE);
5714 if (*ss == ',') *ss = 0; else finished = TRUE;
5716 /* Check max recipients - if -t was used, these aren't recipients */
5718 if (recipients_max > 0 && ++rcount > recipients_max &&
5719 !extract_recipients)
5720 if (error_handling == ERRORS_STDERR)
5722 fprintf(stderr, "exim: too many recipients\n");
5723 exim_exit(EXIT_FAILURE);
5727 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5728 errors_sender_rc : EXIT_FAILURE;
5732 BOOL b = allow_utf8_domains;
5733 allow_utf8_domains = TRUE;
5736 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5740 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5741 else allow_utf8_domains = b;
5746 if (domain == 0 && !f.allow_unqualified_recipient)
5749 errmess = US"unqualified recipient address not allowed";
5753 if (error_handling == ERRORS_STDERR)
5755 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5756 string_printing(list[i]), errmess);
5757 exim_exit(EXIT_FAILURE);
5763 eblock.text1 = string_printing(list[i]);
5764 eblock.text2 = errmess;
5766 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5767 errors_sender_rc : EXIT_FAILURE;
5770 receive_add_recipient(string_copy_taint(recipient, TRUE), -1);
5773 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5777 /* Show the recipients when debugging */
5781 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5782 if (recipients_list)
5784 debug_printf("Recipients:\n");
5785 for (int i = 0; i < recipients_count; i++)
5786 debug_printf(" %s\n", recipients_list[i].address);
5790 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5791 ignored; rejecting here would just add complication, and it can just as
5792 well be done later. Allow $recipients to be visible in the ACL. */
5794 if (acl_not_smtp_start)
5796 uschar *user_msg, *log_msg;
5797 f.enable_dollar_recipients = TRUE;
5798 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5799 &user_msg, &log_msg);
5800 f.enable_dollar_recipients = FALSE;
5803 /* Pause for a while waiting for input. If none received in that time,
5804 close the logfile, if we had one open; then if we wait for a long-running
5805 datasource (months, in one use-case) log rotation will not leave us holding
5808 if (!receive_timeout)
5809 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5812 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5813 will just read the headers for the message, and not write anything onto the
5816 message_ended = END_NOTENDED;
5817 more = receive_msg(extract_recipients);
5819 /* more is always FALSE here (not SMTP message) when reading a message
5820 for real; when reading the headers of a message for filter testing,
5821 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5823 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5824 } /* Non-SMTP message reception */
5826 /* If this is a filter testing run, there are headers in store, but
5827 no message on the spool. Run the filtering code in testing mode, setting
5828 the domain to the qualify domain and the local part to the current user,
5829 unless they have been set by options. The prefix and suffix are left unset
5830 unless specified. The the return path is set to to the sender unless it has
5831 already been set from a return-path header in the message. */
5833 if (filter_test != FTEST_NONE)
5835 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5836 deliver_domain_orig = deliver_domain;
5837 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5838 deliver_localpart_orig = deliver_localpart;
5839 deliver_localpart_prefix = US ftest_prefix;
5840 deliver_localpart_suffix = US ftest_suffix;
5841 deliver_home = originator_home;
5845 printf("Return-path copied from sender\n");
5846 return_path = string_copy(sender_address);
5849 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5850 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5852 receive_add_recipient(
5853 string_sprintf("%s%s%s@%s",
5854 ftest_prefix ? ftest_prefix : US"",
5856 ftest_suffix ? ftest_suffix : US"",
5857 deliver_domain), -1);
5859 printf("Recipient = %s\n", recipients_list[0].address);
5860 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5861 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5863 if (chdir("/")) /* Get away from wherever the user is running this from */
5865 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5866 exim_exit(EXIT_FAILURE);
5869 /* Now we run either a system filter test, or a user filter test, or both.
5870 In the latter case, headers added by the system filter will persist and be
5871 available to the user filter. We need to copy the filter variables
5874 if (filter_test & FTEST_SYSTEM)
5875 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5876 exim_exit(EXIT_FAILURE);
5878 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5880 if (filter_test & FTEST_USER)
5881 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5882 exim_exit(EXIT_FAILURE);
5884 exim_exit(EXIT_SUCCESS);
5887 /* Else act on the result of message reception. We should not get here unless
5888 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5889 will be TRUE. If it is not, check on the number of messages received in this
5892 if ( !session_local_queue_only
5893 && smtp_accept_queue_per_connection > 0
5894 && receive_messagecount > smtp_accept_queue_per_connection)
5896 session_local_queue_only = TRUE;
5897 queue_only_reason = 2;
5900 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5901 and queue_only_load is set, check that the load average is below it. If it is
5902 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5903 default), we put the whole session into queue_only mode. It then remains this
5904 way for any subsequent messages on the same SMTP connection. This is a
5905 deliberate choice; even though the load average may fall, it doesn't seem
5906 right to deliver later messages on the same call when not delivering earlier
5907 ones. However, there are odd cases where this is not wanted, so this can be
5908 changed by setting queue_only_load_latch false. */
5910 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5911 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5913 queue_only_reason = 3;
5914 if (queue_only_load_latch) session_local_queue_only = TRUE;
5917 /* If running as an MUA wrapper, all queueing options and freezing options
5921 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5923 /* Log the queueing here, when it will get a message id attached, but
5924 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5927 if (local_queue_only)
5929 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5930 switch(queue_only_reason)
5933 log_write(L_delay_delivery,
5934 LOG_MAIN, "no immediate delivery: more than %d messages "
5935 "received in one connection", smtp_accept_queue_per_connection);
5939 log_write(L_delay_delivery,
5940 LOG_MAIN, "no immediate delivery: load average %.2f",
5941 (double)load_average/1000.0);
5946 else if (f.queue_only_policy || f.deliver_freeze)
5947 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5949 /* Else do the delivery unless the ACL or local_scan() called for queue only
5950 or froze the message. Always deliver in a separate process. A fork failure is
5951 not a disaster, as the delivery will eventually happen on a subsequent queue
5952 run. The search cache must be tidied before the fork, as the parent will
5953 do it before exiting. The child will trigger a lookup failure and
5954 thereby defer the delivery if it tries to use (for example) a cached ldap
5955 connection that the parent has called unbind on. */
5962 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
5965 close_unwanted(); /* Close unwanted file descriptors and TLS */
5966 exim_nullstd(); /* Ensure std{in,out,err} exist */
5968 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5969 mode, deliver_drop_privilege is forced TRUE). */
5971 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5973 delivery_re_exec(CEE_EXEC_EXIT);
5974 /* Control does not return here. */
5977 /* No need to re-exec */
5979 rc = deliver_message(message_id, FALSE, FALSE);
5981 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
5982 ? EXIT_SUCCESS : EXIT_FAILURE);
5987 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
5988 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5989 "process: %s", strerror(errno));
5993 release_cutthrough_connection(US"msg passed for delivery");
5995 /* In the parent, wait if synchronous delivery is required. This will
5996 always be the case in MUA wrapper mode. */
5998 if (f.synchronous_delivery)
6001 while (wait(&status) != pid);
6002 if ((status & 0x00ff) != 0)
6003 log_write(0, LOG_MAIN|LOG_PANIC,
6004 "process %d crashed with signal %d while delivering %s",
6005 (int)pid, status & 0x00ff, message_id);
6006 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6011 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6012 automatically reaps children (see comments above the loop), clear away any
6013 finished subprocesses here, in case there are lots of messages coming in
6014 from the same source. */
6016 #ifndef SIG_IGN_WORKS
6017 while (waitpid(-1, NULL, WNOHANG) > 0);
6021 return_path = sender_address = NULL;
6022 authenticated_sender = NULL;
6023 deliver_localpart_orig = NULL;
6024 deliver_domain_orig = NULL;
6025 deliver_host = deliver_host_address = NULL;
6026 dnslist_domain = dnslist_matched = NULL;
6027 #ifdef WITH_CONTENT_SCAN
6028 malware_name = NULL;
6030 callout_address = NULL;
6031 sending_ip_address = NULL;
6032 deliver_localpart_data = deliver_domain_data =
6033 recipient_data = sender_data = NULL;
6035 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6037 store_reset(reset_point);
6040 exim_exit(EXIT_SUCCESS); /* Never returns */
6041 return 0; /* To stop compiler warning */