1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2022 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
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, const 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, GET_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(
2277 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2279 host_checking = checking = f.log_testing_mode = TRUE;
2280 f.host_checking_callout = *argrest == 'c';
2281 message_logs = FALSE;
2286 /* -bi: This option is used by sendmail to initialize *the* alias file,
2287 though it has the -oA option to specify a different file. Exim has no
2288 concept of *the* alias file, but since Sun's YP make script calls
2289 sendmail this way, some support must be provided. */
2291 if (!*argrest) bi_option = TRUE;
2295 /* -bI: provide information, of the type to follow after a colon.
2296 This is an Exim flag. */
2298 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2300 uschar *p = argrest+1;
2301 info_flag = CMDINFO_HELP;
2303 if (strcmpic(p, CUS"sieve") == 0)
2305 info_flag = CMDINFO_SIEVE;
2308 else if (strcmpic(p, CUS"dscp") == 0)
2310 info_flag = CMDINFO_DSCP;
2313 else if (strcmpic(p, CUS"help") == 0)
2319 /* -bm: Accept and deliver message - the default option. Reinstate
2320 receiving_message, which got turned off for all -b options.
2321 -bmalware: test the filename given for malware */
2323 if (!*argrest) receiving_message = TRUE;
2324 else if (Ustrcmp(argrest, "alware") == 0)
2326 if (++i >= argc) { badarg = TRUE; break; }
2328 malware_test_file = argv[i];
2333 /* -bnq: For locally originating messages, do not qualify unqualified
2334 addresses. In the envelope, this causes errors; in header lines they
2337 if (Ustrcmp(argrest, "q") == 0)
2339 f.allow_unqualified_sender = FALSE;
2340 f.allow_unqualified_recipient = FALSE;
2345 /* -bpxx: List the contents of the mail queue, in various forms. If
2346 the option is -bpc, just a queue count is needed. Otherwise, if the
2347 first letter after p is r, then order is random. */
2349 if (*argrest == 'c')
2352 if (*++argrest) badarg = TRUE;
2356 if (*argrest == 'r')
2358 list_queue_option = 8;
2361 else list_queue_option = 0;
2365 /* -bp: List the contents of the mail queue, top-level only */
2369 /* -bpu: List the contents of the mail queue, top-level undelivered */
2371 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2373 /* -bpa: List the contents of the mail queue, including all delivered */
2375 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2377 /* Unknown after -bp[r] */
2383 /* -bP: List the configuration variables given as the address list.
2384 Force -v, so configuration errors get displayed. */
2387 /* -bP config: we need to setup here, because later,
2388 when list_options is checked, the config is read already */
2391 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2394 readconf_save_config(version_string);
2398 list_options = TRUE;
2399 debug_selector |= D_v;
2400 debug_file = stderr;
2404 /* -brt: Test retry configuration lookup */
2406 if (Ustrcmp(argrest, "t") == 0)
2409 test_retry_arg = i + 1;
2413 /* -brw: Test rewrite configuration */
2415 else if (Ustrcmp(argrest, "w") == 0)
2418 test_rewrite_arg = i + 1;
2424 /* -bS: Read SMTP commands on standard input, but produce no replies -
2425 all errors are reported by sending messages. */
2428 smtp_input = smtp_batched_input = receiving_message = TRUE;
2432 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2433 on standard output. */
2435 if (!*argrest) smtp_input = receiving_message = TRUE;
2439 /* -bt: address testing mode */
2442 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2446 /* -bv: verify addresses */
2449 verify_address_mode = checking = f.log_testing_mode = TRUE;
2451 /* -bvs: verify sender addresses */
2453 else if (Ustrcmp(argrest, "s") == 0)
2455 verify_address_mode = checking = f.log_testing_mode = TRUE;
2456 verify_as_sender = TRUE;
2461 /* -bV: Print version string and support details */
2465 printf("Exim version %s #%s built %s\n", version_string,
2466 version_cnumber, version_date);
2467 printf("%s\n", CS version_copyright);
2468 version_printed = TRUE;
2469 show_whats_supported(TRUE);
2470 f.log_testing_mode = TRUE;
2475 /* -bw: inetd wait mode, accept a listening socket as stdin */
2477 f.inetd_wait_mode = TRUE;
2478 f.background_daemon = FALSE;
2479 f.daemon_listen = TRUE;
2481 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2482 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2493 /* -C: change configuration file list; ignore if it isn't really
2494 a change! Enforce a prefix check if required. */
2498 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2499 if (Ustrcmp(config_main_filelist, argrest) != 0)
2501 #ifdef ALT_CONFIG_PREFIX
2503 int len = Ustrlen(ALT_CONFIG_PREFIX);
2504 const uschar *list = argrest;
2506 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2507 while((filename = string_nextinlist(&list, &sep, big_buffer,
2509 if ( ( Ustrlen(filename) < len
2510 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2511 || Ustrstr(filename, "/../") != NULL
2513 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2515 exim_fail("-C Permission denied\n");
2517 if (real_uid != root_uid)
2519 #ifdef TRUSTED_CONFIG_LIST
2521 if (real_uid != exim_uid
2522 #ifdef CONFIGURE_OWNER
2523 && real_uid != config_uid
2526 f.trusted_config = FALSE;
2529 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2532 struct stat statbuf;
2534 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2535 (statbuf.st_uid != root_uid /* owner not root */
2536 #ifdef CONFIGURE_OWNER
2537 && statbuf.st_uid != config_uid /* owner not the special one */
2540 (statbuf.st_gid != root_gid /* group not root */
2541 #ifdef CONFIGURE_GROUP
2542 && statbuf.st_gid != config_gid /* group not the special one */
2544 && (statbuf.st_mode & 020) != 0 /* group writeable */
2546 (statbuf.st_mode & 2) != 0) /* world writeable */
2548 f.trusted_config = FALSE;
2553 /* Well, the trust list at least is up to scratch... */
2555 uschar *trusted_configs[32];
2558 int old_pool = store_pool;
2559 store_pool = POOL_MAIN;
2561 reset_point = store_mark();
2562 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2564 uschar *start = big_buffer, *nl;
2565 while (*start && isspace(*start))
2569 nl = Ustrchr(start, '\n');
2572 trusted_configs[nr_configs++] = string_copy(start);
2573 if (nr_configs == nelem(trusted_configs))
2581 const uschar *list = argrest;
2583 while (f.trusted_config && (filename = string_nextinlist(&list,
2584 &sep, big_buffer, big_buffer_size)))
2586 for (i=0; i < nr_configs; i++)
2587 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2589 if (i == nr_configs)
2591 f.trusted_config = FALSE;
2596 else /* No valid prefixes found in trust_list file. */
2597 f.trusted_config = FALSE;
2598 store_reset(reset_point);
2599 store_pool = old_pool;
2602 else /* Could not open trust_list file. */
2603 f.trusted_config = FALSE;
2606 /* Not root; don't trust config */
2607 f.trusted_config = FALSE;
2611 config_main_filelist = argrest;
2612 f.config_changed = TRUE;
2617 /* -D: set up a macro definition */
2620 #ifdef DISABLE_D_OPTION
2621 exim_fail("exim: -D is not available in this Exim binary\n");
2627 uschar *s = argrest;
2630 while (isspace(*s)) s++;
2632 if (*s < 'A' || *s > 'Z')
2633 exim_fail("exim: macro name set by -D must start with "
2634 "an upper case letter\n");
2636 while (isalnum(*s) || *s == '_')
2638 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2642 if (ptr == 0) { badarg = TRUE; break; }
2643 while (isspace(*s)) s++;
2646 if (*s++ != '=') { badarg = TRUE; break; }
2647 while (isspace(*s)) s++;
2650 for (m = macros_user; m; m = m->next)
2651 if (Ustrcmp(m->name, name) == 0)
2652 exim_fail("exim: duplicated -D in command line\n");
2654 m = macro_create(name, s, TRUE);
2656 if (clmacro_count >= MAX_CLMACROS)
2657 exim_fail("exim: too many -D options on command line\n");
2658 clmacros[clmacro_count++] =
2659 string_sprintf("-D%s=%s", m->name, m->replacement);
2666 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2668 if (Ustrcmp(argrest, "ropcr") == 0)
2670 /* drop_cr = TRUE; */
2673 /* -dp: Set up a debug pretrigger buffer with given size. */
2675 else if (Ustrcmp(argrest, "p") == 0)
2679 debug_pretrigger_setup(argv[i]);
2681 /* -dt: Set a debug trigger selector */
2683 else if (Ustrncmp(argrest, "t=", 2) == 0)
2684 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2686 /* -d: Set debug level (see also -v below).
2687 If -dd is used, debugging subprocesses of the daemon is disabled. */
2691 /* Use an intermediate variable so that we don't set debugging while
2692 decoding the debugging bits. */
2694 unsigned int selector = D_default;
2697 if (*argrest == 'd')
2699 f.debug_daemon = TRUE;
2703 decode_bits(&selector, 1, debug_notall, argrest,
2704 debug_options, debug_options_count, US"debug", 0);
2705 debug_selector = selector;
2710 /* -E: This is a local error message. This option is not intended for
2711 external use at all, but is not restricted to trusted callers because it
2712 does no harm (just suppresses certain error messages) and if Exim is run
2713 not setuid root it won't always be trusted when it generates error
2714 messages using this option. If there is a message id following -E, point
2715 message_reference at it, for logging. */
2718 f.local_error_message = TRUE;
2719 if (mac_ismsgid(argrest)) message_reference = argrest;
2723 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2724 option, so it looks as if historically the -oex options are also callable
2725 without the leading -o. So we have to accept them. Before the switch,
2726 anything starting -oe has been converted to -e. Exim does not support all
2727 of the sendmail error options. */
2730 if (Ustrcmp(argrest, "e") == 0)
2732 arg_error_handling = ERRORS_SENDER;
2733 errors_sender_rc = EXIT_SUCCESS;
2735 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2736 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2737 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2738 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2743 /* -F: Set sender's full name, used instead of the gecos entry from
2744 the password file. Since users can usually alter their gecos entries,
2745 there's no security involved in using this instead. The data can follow
2746 the -F or be in the next argument. */
2750 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2751 originator_name = string_copy_taint(
2752 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2754 f.sender_name_forced = TRUE;
2758 /* -f: Set sender's address - this value is only actually used if Exim is
2759 run by a trusted user, or if untrusted_set_sender is set and matches the
2760 address, except that the null address can always be set by any user. The
2761 test for this happens later, when the value given here is ignored when not
2762 permitted. For an untrusted user, the actual sender is still put in Sender:
2763 if it doesn't match the From: header (unless no_local_from_check is set).
2764 The data can follow the -f or be in the next argument. The -r switch is an
2765 obsolete form of -f but since there appear to be programs out there that
2766 use anything that sendmail has ever supported, better accept it - the
2767 synonymizing is done before the switch above.
2769 At this stage, we must allow domain literal addresses, because we don't
2770 know what the setting of allow_domain_literals is yet. Ditto for trailing
2771 dots and strip_trailing_dot. */
2775 int dummy_start, dummy_end;
2778 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2779 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2781 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2784 uschar * temp = argrest + Ustrlen(argrest) - 1;
2785 while (temp >= argrest && isspace(*temp)) temp--;
2786 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2787 allow_domain_literals = TRUE;
2788 strip_trailing_dot = TRUE;
2790 allow_utf8_domains = TRUE;
2792 if (!(sender_address = parse_extract_address(argrest, &errmess,
2793 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2794 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2796 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2798 message_smtputf8 = string_is_utf8(sender_address);
2799 allow_utf8_domains = FALSE;
2801 allow_domain_literals = FALSE;
2802 strip_trailing_dot = FALSE;
2804 f.sender_address_forced = TRUE;
2808 /* -G: sendmail invocation to specify that it's a gateway submission and
2809 sendmail may complain about problems instead of fixing them.
2810 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2811 not at this time complain about problems. */
2817 /* -h: Set the hop count for an incoming message. Exim does not currently
2818 support this; it always computes it by counting the Received: headers.
2819 To put it in will require a change to the spool header file format. */
2823 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2824 if (!isdigit(*argrest)) badarg = TRUE;
2828 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2829 not to be documented for sendmail but mailx (at least) uses it) */
2832 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2836 /* -L: set the identifier used for syslog; equivalent to setting
2837 syslog_processname in the config file, but needs to be an admin option. */
2841 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2842 if ((sz = Ustrlen(argrest)) > 32)
2843 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2845 exim_fail("exim: the -L syslog name is too short\n");
2846 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2850 receiving_message = FALSE;
2852 /* -MC: continue delivery of another message via an existing open
2853 file descriptor. This option is used for an internal call by the
2854 smtp transport when there is a pending message waiting to go to an
2855 address to which it has got a connection. Five subsequent arguments are
2856 required: transport name, host name, IP address, sequence number, and
2857 message_id. Transports may decline to create new processes if the sequence
2858 number gets too big. The channel is stdin. This (-MC) must be the last
2859 argument. There's a subsequent check that the real-uid is privileged.
2861 If we are running in the test harness. delay for a bit, to let the process
2862 that set this one up complete. This makes for repeatability of the logging,
2865 if (Ustrcmp(argrest, "C") == 0)
2867 union sockaddr_46 interface_sock;
2868 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2871 exim_fail("exim: too many or too few arguments after -MC\n");
2873 if (msg_action_arg >= 0)
2874 exim_fail("exim: incompatible arguments\n");
2876 continue_transport = string_copy_taint(
2877 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2879 continue_hostname = string_copy_taint(
2880 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2882 continue_host_address = string_copy_taint(
2883 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2885 continue_sequence = Uatoi(argv[++i]);
2886 msg_action = MSG_DELIVER;
2887 msg_action_arg = ++i;
2888 forced_delivery = TRUE;
2889 queue_run_pid = passed_qr_pid;
2890 queue_run_pipe = passed_qr_pipe;
2892 if (!mac_ismsgid(argv[i]))
2893 exim_fail("exim: malformed message id %s after -MC option\n",
2896 /* Set up $sending_ip_address and $sending_port, unless proxied */
2898 if (!continue_proxy_cipher)
2899 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2901 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2904 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2907 testharness_pause_ms(500);
2911 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2915 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2916 precedes -MC (see above). The flag indicates that the host to which
2917 Exim is connected has accepted an AUTH sequence. */
2919 case 'A': f.smtp_authenticated = TRUE; break;
2921 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2922 that exim is connected to supports the esmtp extension DSN */
2924 case 'D': smtp_peer_options |= OPTION_DSN; break;
2926 /* -MCd: for debug, set a process-purpose string */
2928 case 'd': if (++i < argc)
2929 process_purpose = string_copy_taint(
2930 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2935 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2936 from the commandline should be tainted - but we will need an untainted
2937 value for the spoolfile when doing a -odi delivery process. */
2939 case 'G': if (++i < argc) queue_name = string_copy_taint(
2940 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2945 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2947 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2949 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2950 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2951 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2953 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2955 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2960 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2961 it preceded -MC (see above) */
2963 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2965 #ifdef SUPPORT_SOCKS
2966 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2967 case 'p': proxy_session = TRUE;
2970 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
2973 proxy_local_port = Uatoi(argv[i]);
2976 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
2979 proxy_external_port = Uatoi(argv[i]);
2985 /* -MCQ: pass on the pid of the queue-running process that started
2986 this chain of deliveries and the fd of its synchronizing pipe; this
2987 is useful only when it precedes -MC (see above) */
2989 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2991 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2995 /* -MCq: do a quota check on the given recipient for the given size
2996 of message. Separate from -MC. */
2997 case 'q': rcpt_verify_quota = TRUE;
2998 if (++i < argc) message_size = Uatoi(argv[i]);
3002 /* -MCS: set the smtp_use_size flag; this is useful only when it
3003 precedes -MC (see above) */
3005 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3008 /* -MCs: used with -MCt; SNI was sent */
3009 /* -MCr: ditto, DANE */
3012 case 's': if (++i < argc)
3014 continue_proxy_sni = string_copy_taint(
3015 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3017 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3022 /* -MCt: similar to -MCT below but the connection is still open
3023 via a proxy process which handles the TLS context and coding.
3024 Require three arguments for the proxied local address and port,
3025 and the TLS cipher. */
3027 case 't': if (++i < argc)
3028 sending_ip_address = string_copy_taint(
3029 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3033 sending_port = (int)(Uatol(argv[i]));
3036 continue_proxy_cipher = string_copy_taint(
3037 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3042 /* -MCT: set the tls_offered flag; this is useful only when it
3043 precedes -MC (see above). The flag indicates that the host to which
3044 Exim is connected has offered TLS support. */
3046 case 'T': smtp_peer_options |= OPTION_TLS; break;
3049 default: badarg = TRUE; break;
3054 /* -M[x]: various operations on the following list of message ids:
3055 -M deliver the messages, ignoring next retry times and thawing
3056 -Mc deliver the messages, checking next retry times, no thawing
3057 -Mf freeze the messages
3058 -Mg give up on the messages
3059 -Mt thaw the messages
3060 -Mrm remove the messages
3061 In the above cases, this must be the last option. There are also the
3062 following options which are followed by a single message id, and which
3063 act on that message. Some of them use the "recipient" addresses as well.
3064 -Mar add recipient(s)
3065 -MG move to a different queue
3066 -Mmad mark all recipients delivered
3067 -Mmd mark recipients(s) delivered
3069 -Mset load a message for use with -be
3071 -Mvc show copy (of whole message, in RFC 2822 format)
3078 msg_action = MSG_DELIVER;
3079 forced_delivery = f.deliver_force_thaw = TRUE;
3081 else if (Ustrcmp(argrest, "ar") == 0)
3083 msg_action = MSG_ADD_RECIPIENT;
3084 one_msg_action = TRUE;
3086 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3087 else if (Ustrcmp(argrest, "es") == 0)
3089 msg_action = MSG_EDIT_SENDER;
3090 one_msg_action = TRUE;
3092 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3093 else if (Ustrcmp(argrest, "g") == 0)
3095 msg_action = MSG_DELIVER;
3096 deliver_give_up = TRUE;
3098 else if (Ustrcmp(argrest, "G") == 0)
3100 msg_action = MSG_SETQUEUE;
3101 queue_name_dest = string_copy_taint(
3102 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3105 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3106 else if (Ustrcmp(argrest, "md") == 0)
3108 msg_action = MSG_MARK_DELIVERED;
3109 one_msg_action = TRUE;
3111 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3112 else if (Ustrcmp(argrest, "set") == 0)
3114 msg_action = MSG_LOAD;
3115 one_msg_action = TRUE;
3117 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3118 else if (Ustrcmp(argrest, "vb") == 0)
3120 msg_action = MSG_SHOW_BODY;
3121 one_msg_action = TRUE;
3123 else if (Ustrcmp(argrest, "vc") == 0)
3125 msg_action = MSG_SHOW_COPY;
3126 one_msg_action = TRUE;
3128 else if (Ustrcmp(argrest, "vh") == 0)
3130 msg_action = MSG_SHOW_HEADER;
3131 one_msg_action = TRUE;
3133 else if (Ustrcmp(argrest, "vl") == 0)
3135 msg_action = MSG_SHOW_LOG;
3136 one_msg_action = TRUE;
3138 else { badarg = TRUE; break; }
3140 /* All the -Mxx options require at least one message id. */
3142 msg_action_arg = i + 1;
3143 if (msg_action_arg >= argc)
3144 exim_fail("exim: no message ids given after %s option\n", arg);
3146 /* Some require only message ids to follow */
3148 if (!one_msg_action)
3150 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3151 exim_fail("exim: malformed message id %s after %s option\n",
3153 goto END_ARG; /* Remaining args are ids */
3156 /* Others require only one message id, possibly followed by addresses,
3157 which will be handled as normal arguments. */
3161 if (!mac_ismsgid(argv[msg_action_arg]))
3162 exim_fail("exim: malformed message id %s after %s option\n",
3163 argv[msg_action_arg], arg);
3169 /* Some programs seem to call the -om option without the leading o;
3170 for sendmail it askes for "me too". Exim always does this. */
3173 if (*argrest) badarg = TRUE;
3177 /* -N: don't do delivery - a debugging option that stops transports doing
3178 their thing. It implies debugging at the D_v level. */
3183 f.dont_deliver = TRUE;
3184 debug_selector |= D_v;
3185 debug_file = stderr;
3191 /* -n: This means "don't alias" in sendmail, apparently.
3192 For normal invocations, it has no effect.
3193 It may affect some other options. */
3199 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3200 option to the specified value. This form uses long names. We need to handle
3201 -O option=value and -Ooption=value. */
3206 exim_fail("exim: string expected after -O\n");
3212 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3215 if (!*(alias_arg = argrest))
3216 if (i+1 < argc) alias_arg = argv[++i];
3217 else exim_fail("exim: string expected after -oA\n");
3220 /* -oB: Set a connection message max value for remote deliveries */
3223 uschar * p = argrest;
3225 if (i+1 < argc && isdigit((argv[i+1][0])))
3229 connection_max_messages = 1;
3236 exim_fail("exim: number expected after -oB\n");
3237 connection_max_messages = Uatoi(p);
3242 /* -odb: background delivery */
3245 if (Ustrcmp(argrest, "b") == 0)
3247 f.synchronous_delivery = FALSE;
3248 arg_queue_only = FALSE;
3249 queue_only_set = TRUE;
3252 /* -odd: testsuite-only: add no inter-process delays */
3254 else if (Ustrcmp(argrest, "d") == 0)
3255 f.testsuite_delays = FALSE;
3257 /* -odf: foreground delivery (smail-compatible option); same effect as
3258 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3261 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3263 f.synchronous_delivery = TRUE;
3264 arg_queue_only = FALSE;
3265 queue_only_set = TRUE;
3268 /* -odq: queue only */
3270 else if (Ustrcmp(argrest, "q") == 0)
3272 f.synchronous_delivery = FALSE;
3273 arg_queue_only = TRUE;
3274 queue_only_set = TRUE;
3277 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3278 but no remote delivery */
3280 else if (Ustrcmp(argrest, "qs") == 0)
3282 f.queue_smtp = TRUE;
3283 arg_queue_only = FALSE;
3284 queue_only_set = TRUE;
3289 /* -oex: Sendmail error flags. As these are also accepted without the
3290 leading -o prefix, for compatibility with vacation and other callers,
3291 they are handled with -e above. */
3293 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3294 -oitrue: Another sendmail syntax for the same */
3297 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3302 /* -oM*: Set various characteristics for an incoming message; actually
3303 acted on for trusted callers only. */
3308 exim_fail("exim: data expected after -oM%s\n", argrest);
3310 /* -oMa: Set sender host address */
3312 if (Ustrcmp(argrest, "a") == 0)
3313 sender_host_address = string_copy_taint(
3314 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3317 /* -oMaa: Set authenticator name */
3319 else if (Ustrcmp(argrest, "aa") == 0)
3320 sender_host_authenticated = string_copy_taint(
3321 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3324 /* -oMas: setting authenticated sender */
3326 else if (Ustrcmp(argrest, "as") == 0)
3327 authenticated_sender = string_copy_taint(
3328 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3331 /* -oMai: setting authenticated id */
3333 else if (Ustrcmp(argrest, "ai") == 0)
3334 authenticated_id = string_copy_taint(
3335 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3338 /* -oMi: Set incoming interface address */
3340 else if (Ustrcmp(argrest, "i") == 0)
3341 interface_address = string_copy_taint(
3342 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3345 /* -oMm: Message reference */
3347 else if (Ustrcmp(argrest, "m") == 0)
3349 if (!mac_ismsgid(argv[i+1]))
3350 exim_fail("-oMm must be a valid message ID\n");
3351 if (!f.trusted_config)
3352 exim_fail("-oMm must be called by a trusted user/config\n");
3353 message_reference = argv[++i];
3356 /* -oMr: Received protocol */
3358 else if (Ustrcmp(argrest, "r") == 0)
3360 if (received_protocol)
3361 exim_fail("received_protocol is set already\n");
3363 received_protocol = string_copy_taint(
3364 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3367 /* -oMs: Set sender host name */
3369 else if (Ustrcmp(argrest, "s") == 0)
3370 sender_host_name = string_copy_taint(
3371 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3374 /* -oMt: Set sender ident */
3376 else if (Ustrcmp(argrest, "t") == 0)
3378 sender_ident_set = TRUE;
3379 sender_ident = string_copy_taint(
3380 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3384 /* Else a bad argument */
3391 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3392 seem to call this as -m (undocumented), so that is also accepted (see
3394 /* -oo: An ancient flag for old-style addresses which still seems to
3395 crop up in some calls (see in SCO). */
3399 if (*argrest) badarg = TRUE;
3402 /* -oP <name>: set pid file path for daemon
3403 -oPX: delete pid file of daemon */
3406 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3407 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3408 "(uid=%d euid=%d | %d)\n",
3409 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3410 if (!*argrest) override_pid_file_path = argv[++i];
3411 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3416 /* -or <n>: set timeout for non-SMTP acceptance
3417 -os <n>: set timeout for SMTP acceptance */
3422 int * tp = argrest[-1] == 'r'
3423 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3425 *tp = readconf_readtime(argrest, 0, FALSE);
3426 else if (i+1 < argc)
3427 *tp = readconf_readtime(argv[++i], 0, FALSE);
3430 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3434 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3435 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3438 if (*argrest) badarg = TRUE;
3439 else override_local_interfaces = string_copy_taint(
3440 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3444 /* -oY: Override creation of daemon notifier socket */
3447 if (*argrest) badarg = TRUE;
3448 else notifier_socket = NULL;
3451 /* Unknown -o argument */
3459 /* -ps: force Perl startup; -pd force delayed Perl startup */
3463 if (*argrest == 's' && argrest[1] == 0)
3465 perl_start_option = 1;
3468 if (*argrest == 'd' && argrest[1] == 0)
3470 perl_start_option = -1;
3475 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3476 which sets the host protocol and host name */
3479 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3483 uschar * hn = Ustrchr(argrest, ':');
3485 if (received_protocol)
3486 exim_fail("received_protocol is set already\n");
3489 received_protocol = string_copy_taint(
3490 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3494 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3495 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3496 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3503 receiving_message = FALSE;
3504 if (queue_interval >= 0)
3505 exim_fail("exim: -q specified more than once\n");
3507 /* -qq...: Do queue runs in a 2-stage manner */
3509 if (*argrest == 'q')
3511 f.queue_2stage = TRUE;
3515 /* -qi...: Do only first (initial) deliveries */
3517 if (*argrest == 'i')
3519 f.queue_run_first_delivery = TRUE;
3523 /* -qf...: Run the queue, forcing deliveries
3524 -qff..: Ditto, forcing thawing as well */
3526 if (*argrest == 'f')
3528 f.queue_run_force = TRUE;
3529 if (*++argrest == 'f')
3531 f.deliver_force_thaw = TRUE;
3536 /* -q[f][f]l...: Run the queue only on local deliveries */
3538 if (*argrest == 'l')
3540 f.queue_run_local = TRUE;
3544 /* -q[f][f][l][G<name>]... Work on the named queue */
3546 if (*argrest == 'G')
3549 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3550 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3551 queue_name = string_copyn(argrest, i);
3553 if (*argrest == '/') argrest++;
3556 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3557 only, optionally named, optionally starting from a given message id. */
3559 if (!(list_queue || count_queue))
3561 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3564 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3565 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3566 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3567 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3570 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3571 forced, optionally local only, optionally named. */
3573 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3575 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3579 case 'R': /* Synonymous with -qR... */
3581 const uschar *tainted_selectstr;
3583 receiving_message = FALSE;
3585 /* -Rf: As -R (below) but force all deliveries,
3586 -Rff: Ditto, but also thaw all frozen messages,
3587 -Rr: String is regex
3588 -Rrf: Regex and force
3589 -Rrff: Regex and force and thaw
3591 in all cases provided there are no further characters in this
3595 for (int i = 0; i < nelem(rsopts); i++)
3596 if (Ustrcmp(argrest, rsopts[i]) == 0)
3598 if (i != 2) f.queue_run_force = TRUE;
3599 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3600 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3601 argrest += Ustrlen(rsopts[i]);
3604 /* -R: Set string to match in addresses for forced queue run to
3605 pick out particular messages. */
3607 /* Avoid attacks from people providing very long strings, and do so before
3610 tainted_selectstr = argrest;
3611 else if (i+1 < argc)
3612 tainted_selectstr = argv[++i];
3614 exim_fail("exim: string expected after -R\n");
3615 deliver_selectstring = string_copy_taint(
3616 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3621 /* -r: an obsolete synonym for -f (see above) */
3624 /* -S: Like -R but works on sender. */
3626 case 'S': /* Synonymous with -qS... */
3628 const uschar *tainted_selectstr;
3630 receiving_message = FALSE;
3632 /* -Sf: As -S (below) but force all deliveries,
3633 -Sff: Ditto, but also thaw all frozen messages,
3634 -Sr: String is regex
3635 -Srf: Regex and force
3636 -Srff: Regex and force and thaw
3638 in all cases provided there are no further characters in this
3642 for (int i = 0; i < nelem(rsopts); i++)
3643 if (Ustrcmp(argrest, rsopts[i]) == 0)
3645 if (i != 2) f.queue_run_force = TRUE;
3646 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3647 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3648 argrest += Ustrlen(rsopts[i]);
3651 /* -S: Set string to match in addresses for forced queue run to
3652 pick out particular messages. */
3655 tainted_selectstr = argrest;
3656 else if (i+1 < argc)
3657 tainted_selectstr = argv[++i];
3659 exim_fail("exim: string expected after -S\n");
3660 deliver_selectstring_sender = string_copy_taint(
3661 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3666 /* -Tqt is an option that is exclusively for use by the testing suite.
3667 It is not recognized in other circumstances. It allows for the setting up
3668 of explicit "queue times" so that various warning/retry things can be
3669 tested. Otherwise variability of clock ticks etc. cause problems. */
3672 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3673 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3678 /* -t: Set flag to extract recipients from body of message. */
3681 if (!*argrest) extract_recipients = TRUE;
3683 /* -ti: Set flag to extract recipients from body of message, and also
3684 specify that dot does not end the message. */
3686 else if (Ustrcmp(argrest, "i") == 0)
3688 extract_recipients = TRUE;
3692 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3695 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3702 /* -U: This means "initial user submission" in sendmail, apparently. The
3703 doc claims that in future sendmail may refuse syntactically invalid
3704 messages instead of fixing them. For the moment, we just ignore it. */
3710 /* -v: verify things - this is a very low-level debugging */
3715 debug_selector |= D_v;
3716 debug_file = stderr;
3722 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3724 The -x flag tells the sendmail command that mail from a local
3725 mail program has National Language Support (NLS) extended characters
3726 in the body of the mail item. The sendmail command can send mail with
3727 extended NLS characters across networks that normally corrupts these
3730 As Exim is 8-bit clean, it just ignores this flag. */
3733 if (*argrest) badarg = TRUE;
3736 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3737 logs to that file. We swallow the parameter and otherwise ignore it. */
3742 exim_fail("exim: string expected after -X\n");
3745 /* -z: a line of text to log */
3750 log_oneline = string_copy_taint(
3751 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3754 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3757 /* All other initial characters are errors */
3762 } /* End of high-level switch statement */
3764 /* Failed to recognize the option, or syntax error */
3767 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3768 "option %s\n", arg);
3772 /* If -R or -S have been specified without -q, assume a single queue run. */
3774 if ( (deliver_selectstring || deliver_selectstring_sender)
3775 && queue_interval < 0)
3780 store_pool = old_pool;
3783 /* If usage_wanted is set we call the usage function - which never returns */
3784 if (usage_wanted) exim_usage(called_as);
3786 /* Arguments have been processed. Check for incompatibilities. */
3787 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3788 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3789 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3790 || filter_test != FTEST_NONE
3791 || msg_action_arg > 0 && !one_msg_action
3793 || ( msg_action_arg > 0
3794 && ( f.daemon_listen || queue_interval > 0 || list_options
3795 || checking && msg_action != MSG_LOAD
3796 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3798 || ( (f.daemon_listen || queue_interval > 0)
3799 && ( sender_address || list_options || list_queue || checking
3802 || f.daemon_listen && queue_interval == 0
3803 || f.inetd_wait_mode && queue_interval >= 0
3805 && ( checking || smtp_input || extract_recipients
3806 || filter_test != FTEST_NONE || bi_option
3808 || ( verify_address_mode
3809 && ( f.address_test_mode || smtp_input || extract_recipients
3810 || filter_test != FTEST_NONE || bi_option
3812 || ( f.address_test_mode
3813 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3817 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3819 || deliver_selectstring && queue_interval < 0
3820 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3822 exim_fail("exim: incompatible command-line options or arguments\n");
3824 /* If debugging is set up, set the file and the file descriptor to pass on to
3825 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3826 to run in the foreground. */
3828 if (debug_selector != 0)
3830 debug_file = stderr;
3831 debug_fd = fileno(debug_file);
3832 f.background_daemon = FALSE;
3833 testharness_pause_ms(100); /* lets caller finish */
3834 if (debug_selector != D_v) /* -v only doesn't show this */
3836 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3837 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3839 if (!version_printed)
3840 show_whats_supported(FALSE);
3844 /* When started with root privilege, ensure that the limits on the number of
3845 open files and the number of processes (where that is accessible) are
3846 sufficiently large, or are unset, in case Exim has been called from an
3847 environment where the limits are screwed down. Not all OS have the ability to
3848 change some of these limits. */
3852 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3858 #ifdef RLIMIT_NOFILE
3859 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3861 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3863 rlp.rlim_cur = rlp.rlim_max = 0;
3866 /* I originally chose 1000 as a nice big number that was unlikely to
3867 be exceeded. It turns out that some older OS have a fixed upper limit of
3870 if (rlp.rlim_cur < 1000)
3872 rlp.rlim_cur = rlp.rlim_max = 1000;
3873 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3875 rlp.rlim_cur = rlp.rlim_max = 256;
3876 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3877 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3884 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3886 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3888 rlp.rlim_cur = rlp.rlim_max = 0;
3891 # ifdef RLIM_INFINITY
3892 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3894 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3896 if (rlp.rlim_cur < 1000)
3898 rlp.rlim_cur = rlp.rlim_max = 1000;
3900 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3901 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3907 /* Exim is normally entered as root (but some special configurations are
3908 possible that don't do this). However, it always spins off sub-processes that
3909 set their uid and gid as required for local delivery. We don't want to pass on
3910 any extra groups that root may belong to, so we want to get rid of them all at
3913 We need to obey setgroups() at this stage, before possibly giving up root
3914 privilege for a changed configuration file, but later on we might need to
3915 check on the additional groups for the admin user privilege - can't do that
3916 till after reading the config, which might specify the exim gid. Therefore,
3917 save the group list here first. */
3919 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3920 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3922 /* There is a fundamental difference in some BSD systems in the matter of
3923 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3924 known not to be different. On the "different" systems there is a single group
3925 list, and the first entry in it is the current group. On all other versions of
3926 Unix there is a supplementary group list, which is in *addition* to the current
3927 group. Consequently, to get rid of all extraneous groups on a "standard" system
3928 you pass over 0 groups to setgroups(), while on a "different" system you pass
3929 over a single group - the current group, which is always the first group in the
3930 list. Calling setgroups() with zero groups on a "different" system results in
3931 an error return. The following code should cope with both types of system.
3933 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3934 the "setgroups() with zero groups" - and changes the egid.
3935 Thanks to that we had to stash the original_egid above, for use below
3936 in the call to exim_setugid().
3938 However, if this process isn't running as root, setgroups() can't be used
3939 since you have to be root to run it, even if throwing away groups.
3940 Except, sigh, for Hurd - where you can.
3941 Not being root here happens only in some unusual configurations. */
3944 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3945 && setgroups(0, NULL) != 0
3947 && setgroups(1, group_list) != 0)
3948 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3950 /* If the configuration file name has been altered by an argument on the
3951 command line (either a new file name or a macro definition) and the caller is
3952 not root, or if this is a filter testing run, remove any setuid privilege the
3953 program has and run as the underlying user.
3955 The exim user is locked out of this, which severely restricts the use of -C
3958 Otherwise, set the real ids to the effective values (should be root unless run
3959 from inetd, which it can either be root or the exim uid, if one is configured).
3961 There is a private mechanism for bypassing some of this, in order to make it
3962 possible to test lots of configurations automatically, without having either to
3963 recompile each time, or to patch in an actual configuration file name and other
3964 values (such as the path name). If running in the test harness, pretend that
3965 configuration file changes and macro definitions haven't happened. */
3968 (!f.trusted_config || /* Config changed, or */
3969 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3970 real_uid != root_uid && /* Not root, and */
3971 !f.running_in_test_harness /* Not fudged */
3973 expansion_test /* expansion testing */
3975 filter_test != FTEST_NONE) /* Filter testing */
3977 setgroups(group_count, group_list);
3978 exim_setugid(real_uid, real_gid, FALSE,
3979 US"-C, -D, -be or -bf forces real uid");
3980 removed_privilege = TRUE;
3982 /* In the normal case when Exim is called like this, stderr is available
3983 and should be used for any logging information because attempts to write
3984 to the log will usually fail. To arrange this, we unset really_exim. However,
3985 if no stderr is available there is no point - we might as well have a go
3986 at the log (if it fails, syslog will be written).
3988 Note that if the invoker is Exim, the logs remain available. Messing with
3989 this causes unlogged successful deliveries. */
3991 if (log_stderr && real_uid != exim_uid)
3992 f.really_exim = FALSE;
3995 /* Privilege is to be retained for the moment. It may be dropped later,
3996 depending on the job that this Exim process has been asked to do. For now, set
3997 the real uid to the effective so that subsequent re-execs of Exim are done by a
4001 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4003 /* If testing a filter, open the file(s) now, before wasting time doing other
4004 setups and reading the message. */
4006 if (filter_test & FTEST_SYSTEM)
4007 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4008 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4011 if (filter_test & FTEST_USER)
4012 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4013 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4016 /* Initialise lookup_list
4017 If debugging, already called above via version reporting.
4018 In either case, we initialise the list of available lookups while running
4019 as root. All dynamically modules are loaded from a directory which is
4020 hard-coded into the binary and is code which, if not a module, would be
4021 part of Exim already. Ability to modify the content of the directory
4022 is equivalent to the ability to modify a setuid binary!
4024 This needs to happen before we read the main configuration. */
4027 /*XXX this excrescence could move to the testsuite standard config setup file */
4029 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4032 /* Read the main runtime configuration data; this gives up if there
4033 is a failure. It leaves the configuration file open so that the subsequent
4034 configuration data for delivery can be read if needed.
4036 NOTE: immediately after opening the configuration file we change the working
4037 directory to "/"! Later we change to $spool_directory. We do it there, because
4038 during readconf_main() some expansion takes place already. */
4040 /* Store the initial cwd before we change directories. Can be NULL if the
4041 dir has already been unlinked. */
4042 initial_cwd = os_getcwd(NULL, 0);
4043 if (!initial_cwd && errno)
4044 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4046 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4047 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4050 -be[m] expansion test -
4051 -b[fF] filter test new
4053 -bmalware malware_test_file new
4055 -brw rewrite test new
4057 -bv[s] address verify -
4059 -bP <option> (except -bP config, which sets list_config)
4061 If any of these options is set, we suppress warnings about configuration
4062 issues (currently about tls_advertise_hosts and keep_environment not being
4066 int old_pool = store_pool;
4067 #ifdef MEASURE_TIMING
4068 struct timeval t0, diff;
4069 (void)gettimeofday(&t0, NULL);
4072 store_pool = POOL_CONFIG;
4073 readconf_main(checking || list_options);
4074 store_pool = old_pool;
4076 #ifdef MEASURE_TIMING
4077 report_time_since(&t0, US"readconf_main (delta)");
4081 /* Now in directory "/" */
4083 if (cleanup_environment() == FALSE)
4084 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4087 /* If an action on specific messages is requested, or if a daemon or queue
4088 runner is being started, we need to know if Exim was called by an admin user.
4089 This is the case if the real user is root or exim, or if the real group is
4090 exim, or if one of the supplementary groups is exim or a group listed in
4091 admin_groups. We don't fail all message actions immediately if not admin_user,
4092 since some actions can be performed by non-admin users. Instead, set admin_user
4093 for later interrogation. */
4095 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4096 f.admin_user = TRUE;
4098 for (int i = 0; i < group_count && !f.admin_user; i++)
4099 if (group_list[i] == exim_gid)
4100 f.admin_user = TRUE;
4101 else if (admin_groups)
4102 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4103 if (admin_groups[j] == group_list[i])
4104 f.admin_user = TRUE;
4106 /* Another group of privileged users are the trusted users. These are root,
4107 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4108 are permitted to specify sender_addresses with -f on the command line, and
4109 other message parameters as well. */
4111 if (real_uid == root_uid || real_uid == exim_uid)
4112 f.trusted_caller = TRUE;
4116 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4117 if (trusted_users[i] == real_uid)
4118 f.trusted_caller = TRUE;
4121 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4122 if (trusted_groups[i] == real_gid)
4123 f.trusted_caller = TRUE;
4124 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4125 if (trusted_groups[i] == group_list[j])
4126 f.trusted_caller = TRUE;
4129 /* At this point, we know if the user is privileged and some command-line
4130 options become possibly impermissible, depending upon the configuration file. */
4132 if (checking && commandline_checks_require_admin && !f.admin_user)
4133 exim_fail("exim: those command-line flags are set to require admin\n");
4135 /* Handle the decoding of logging options. */
4137 decode_bits(log_selector, log_selector_size, log_notall,
4138 log_selector_string, log_options, log_options_count, US"log", 0);
4142 debug_printf("configuration file is %s\n", config_main_filename);
4143 debug_printf("log selectors =");
4144 for (int i = 0; i < log_selector_size; i++)
4145 debug_printf(" %08x", log_selector[i]);
4149 /* If domain literals are not allowed, check the sender address that was
4150 supplied with -f. Ditto for a stripped trailing dot. */
4154 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4155 exim_fail("exim: bad -f address \"%s\": domain literals not "
4156 "allowed\n", sender_address);
4157 if (f_end_dot && !strip_trailing_dot)
4158 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4159 "(trailing dot not allowed)\n", sender_address);
4162 /* See if an admin user overrode our logging. */
4164 if (cmdline_syslog_name)
4167 syslog_processname = cmdline_syslog_name;
4168 log_file_path = string_copy(CUS"syslog");
4171 /* not a panic, non-privileged users should not be able to spam paniclog */
4173 "exim: you lack sufficient privilege to specify syslog process name\n");
4175 /* Paranoia check of maximum lengths of certain strings. There is a check
4176 on the length of the log file path in log.c, which will come into effect
4177 if there are any calls to write the log earlier than this. However, if we
4178 get this far but the string is very long, it is better to stop now than to
4179 carry on and (e.g.) receive a message and then have to collapse. The call to
4180 log_write() from here will cause the ultimate panic collapse if the complete
4181 file name exceeds the buffer length. */
4183 if (Ustrlen(log_file_path) > 200)
4184 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4185 "log_file_path is longer than 200 chars: aborting");
4187 if (Ustrlen(pid_file_path) > 200)
4188 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4189 "pid_file_path is longer than 200 chars: aborting");
4191 if (Ustrlen(spool_directory) > 200)
4192 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4193 "spool_directory is longer than 200 chars: aborting");
4195 /* Length check on the process name given to syslog for its TAG field,
4196 which is only permitted to be 32 characters or less. See RFC 3164. */
4198 if (Ustrlen(syslog_processname) > 32)
4199 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4200 "syslog_processname is longer than 32 chars: aborting");
4205 log_write(0, LOG_MAIN, "%s", log_oneline);
4206 return EXIT_SUCCESS;
4209 return EXIT_FAILURE;
4211 /* In some operating systems, the environment variable TMPDIR controls where
4212 temporary files are created; Exim doesn't use these (apart from when delivering
4213 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4214 If TMPDIR is found in the environment, reset it to the value defined in the
4215 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4216 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4217 EXIM_TMPDIR by the build scripts.
4221 if (environ) for (uschar ** p = USS environ; *p; p++)
4222 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4224 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4225 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4227 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4231 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4232 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4233 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4234 called by a user who has set the TZ variable. This then affects the timestamps
4235 in log files and in Received: headers, and any created Date: header lines. The
4236 required timezone is settable in the configuration file, so nothing can be done
4237 about this earlier - but hopefully nothing will normally be logged earlier than
4238 this. We have to make a new environment if TZ is wrong, but don't bother if
4239 timestamps_utc is set, because then all times are in UTC anyway. */
4241 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4242 f.timestamps_utc = TRUE;
4245 uschar *envtz = US getenv("TZ");
4247 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4248 : timezone_string != NULL
4251 uschar **p = USS environ;
4255 if (environ) while (*p++) count++;
4256 if (!envtz) count++;
4257 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4258 if (environ) for (p = USS environ; *p; p++)
4259 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4260 if (timezone_string)
4262 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4263 sprintf(CS *newp++, "TZ=%s", timezone_string);
4268 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4269 tod_stamp(tod_log));
4273 /* Handle the case when we have removed the setuid privilege because of -C or
4274 -D. This means that the caller of Exim was not root.
4276 There is a problem if we were running as the Exim user. The sysadmin may
4277 expect this case to retain privilege because "the binary was called by the
4278 Exim user", but it hasn't, because either the -D option set macros, or the
4279 -C option set a non-trusted configuration file. There are two possibilities:
4281 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4282 to do message deliveries. Thus, the fact that it is running as a
4283 non-privileged user is plausible, and might be wanted in some special
4284 configurations. However, really_exim will have been set false when
4285 privilege was dropped, to stop Exim trying to write to its normal log
4286 files. Therefore, re-enable normal log processing, assuming the sysadmin
4287 has set up the log directory correctly.
4289 (2) If deliver_drop_privilege is not set, the configuration won't work as
4290 apparently intended, and so we log a panic message. In order to retain
4291 root for -C or -D, the caller must either be root or be invoking a
4292 trusted configuration file (when deliver_drop_privilege is false). */
4294 if ( removed_privilege
4295 && (!f.trusted_config || opt_D_used)
4296 && real_uid == exim_uid)
4297 if (deliver_drop_privilege)
4298 f.really_exim = TRUE; /* let logging work normally */
4300 log_write(0, LOG_MAIN|LOG_PANIC,
4301 "exim user lost privilege for using %s option",
4302 f.trusted_config? "-D" : "-C");
4304 /* Start up Perl interpreter if Perl support is configured and there is a
4305 perl_startup option, and the configuration or the command line specifies
4306 initializing starting. Note that the global variables are actually called
4307 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4310 if (perl_start_option != 0)
4311 opt_perl_at_start = (perl_start_option > 0);
4312 if (opt_perl_at_start && opt_perl_startup != NULL)
4315 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4316 if ((errstr = init_perl(opt_perl_startup)))
4317 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4318 opt_perl_started = TRUE;
4320 #endif /* EXIM_PERL */
4322 /* Log the arguments of the call if the configuration file said so. This is
4323 a debugging feature for finding out what arguments certain MUAs actually use.
4324 Don't attempt it if logging is disabled, or if listing variables or if
4325 verifying/testing addresses or expansions. */
4327 if ( (debug_selector & D_any || LOGGING(arguments))
4328 && f.really_exim && !list_options && !checking)
4330 uschar *p = big_buffer;
4331 Ustrcpy(p, US"cwd= (failed)");
4338 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4339 p += Ustrlen(CCS p);
4342 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4344 for (int i = 0; i < argc; i++)
4346 int len = Ustrlen(argv[i]);
4347 const uschar *printing;
4349 if (p + len + 8 >= big_buffer + big_buffer_size)
4351 Ustrcpy(p, US" ...");
4352 log_write(0, LOG_MAIN, "%s", big_buffer);
4353 Ustrcpy(big_buffer, US"...");
4356 printing = string_printing(argv[i]);
4357 if (!*printing) quote = US"\"";
4360 const uschar *pp = printing;
4362 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4364 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4365 (p - big_buffer) - 4), printing, quote);
4368 if (LOGGING(arguments))
4369 log_write(0, LOG_MAIN, "%s", big_buffer);
4371 debug_printf("%s\n", big_buffer);
4374 /* Set the working directory to be the top-level spool directory. We don't rely
4375 on this in the code, which always uses fully qualified names, but it's useful
4376 for core dumps etc. Don't complain if it fails - the spool directory might not
4377 be generally accessible and calls with the -C option (and others) have lost
4378 privilege by now. Before the chdir, we try to ensure that the directory exists.
4381 if (Uchdir(spool_directory) != 0)
4383 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4384 (void) Uchdir(spool_directory);
4387 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4388 alias file. Exim doesn't have such a concept, but this call is screwed into
4389 Sun's YP makefiles. Handle this by calling a configured script, as the real
4390 user who called Exim. The -oA option can be used to pass an argument to the
4395 (void) fclose(config_file);
4396 if (bi_command && *bi_command)
4400 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4401 if (alias_arg) argv[i++] = alias_arg;
4404 setgroups(group_count, group_list);
4405 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4407 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4408 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4410 execv(CS argv[0], (char *const *)argv);
4411 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4415 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4420 /* We moved the admin/trusted check to be immediately after reading the
4421 configuration file. We leave these prints here to ensure that syslog setup,
4422 logfile setup, and so on has already happened. */
4424 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4425 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4427 /* Only an admin user may start the daemon or force a queue run in the default
4428 configuration, but the queue run restriction can be relaxed. Only an admin
4429 user may request that a message be returned to its sender forthwith. Only an
4430 admin user may specify a debug level greater than D_v (because it might show
4431 passwords, etc. in lookup queries). Only an admin user may request a queue
4432 count. Only an admin user can use the test interface to scan for email
4433 (because Exim will be in the spool dir and able to look at mails). */
4437 BOOL debugset = (debug_selector & ~D_v) != 0;
4438 if ( deliver_give_up || f.daemon_listen || malware_test_file
4439 || count_queue && queue_list_requires_admin
4440 || list_queue && queue_list_requires_admin
4441 || queue_interval >= 0 && prod_requires_admin
4442 || queue_name_dest && prod_requires_admin
4443 || debugset && !f.running_in_test_harness
4445 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4448 /* If the real user is not root or the exim uid, the argument for passing
4449 in an open TCP/IP connection for another message is not permitted, nor is
4450 running with the -N option for any delivery action, unless this call to exim is
4451 one that supplied an input message, or we are using a patched exim for
4452 regression testing. */
4454 if ( real_uid != root_uid && real_uid != exim_uid
4455 && ( continue_hostname
4457 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4459 && !f.running_in_test_harness
4461 exim_fail("exim: Permission denied\n");
4463 /* If the caller is not trusted, certain arguments are ignored when running for
4464 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4465 Note that authority for performing certain actions on messages is tested in the
4466 queue_action() function. */
4468 if (!f.trusted_caller && !checking)
4470 sender_host_name = sender_host_address = interface_address =
4471 sender_ident = received_protocol = NULL;
4472 sender_host_port = interface_port = 0;
4473 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4476 /* If a sender host address is set, extract the optional port number off the
4477 end of it and check its syntax. Do the same thing for the interface address.
4478 Exim exits if the syntax is bad. */
4482 if (sender_host_address)
4483 sender_host_port = check_port(sender_host_address);
4484 if (interface_address)
4485 interface_port = check_port(interface_address);
4488 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4491 if (f.trusted_caller)
4493 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4494 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4497 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4500 /* If an SMTP message is being received check to see if the standard input is a
4501 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4502 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4507 union sockaddr_46 inetd_sock;
4508 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4509 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4511 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4512 if (family == AF_INET || family == AF_INET6)
4514 union sockaddr_46 interface_sock;
4515 size = sizeof(interface_sock);
4517 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4518 interface_address = host_ntoa(-1, &interface_sock, NULL,
4521 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4523 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4526 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4527 NULL, &sender_host_port);
4528 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4529 "inetd is not supported when mua_wrapper is set");
4533 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4538 /* If the load average is going to be needed while receiving a message, get it
4539 now for those OS that require the first call to os_getloadavg() to be done as
4540 root. There will be further calls later for each message received. */
4542 #ifdef LOAD_AVG_NEEDS_ROOT
4543 if ( receiving_message
4544 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4545 load_average = OS_GETLOADAVG();
4548 /* The queue_only configuration option can be overridden by -odx on the command
4549 line, except that if queue_only_override is false, queue_only cannot be unset
4550 from the command line. */
4552 if (queue_only_set && (queue_only_override || arg_queue_only))
4553 queue_only = arg_queue_only;
4555 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4558 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4559 if (arg_smtp_receive_timeout >= 0)
4560 smtp_receive_timeout = arg_smtp_receive_timeout;
4562 /* If Exim was started with root privilege, unless we have already removed the
4563 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4564 except when starting the daemon or doing some kind of delivery or address
4565 testing (-bt). These are the only cases when root need to be retained. We run
4566 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4567 retained only for starting the daemon. We always do the initgroups() in this
4568 situation (controlled by the TRUE below), in order to be as close as possible
4569 to the state Exim usually runs in. */
4571 if ( !unprivileged /* originally had root AND */
4572 && !removed_privilege /* still got root AND */
4573 && !f.daemon_listen /* not starting the daemon */
4574 && queue_interval <= 0 /* (either kind of daemon) */
4575 && ( /* AND EITHER */
4576 deliver_drop_privilege /* requested unprivileged */
4578 queue_interval < 0 /* not running the queue */
4579 && ( msg_action_arg < 0 /* and */
4580 || msg_action != MSG_DELIVER /* not delivering */
4582 && (!checking || !f.address_test_mode) /* not address checking */
4583 && !rcpt_verify_quota /* and not quota checking */
4585 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4587 /* When we are retaining a privileged uid, we still change to the exim gid. */
4592 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4593 rv = setgid(exim_gid);
4594 /* Impact of failure is that some stuff might end up with an incorrect group.
4595 We track this for failures from root, since any attempt to change privilege
4596 by root should succeed and failures should be examined. For non-root,
4597 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4598 no need to complain then. */
4600 if (!(unprivileged || removed_privilege))
4601 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4604 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4605 (long int)exim_gid, strerror(errno));
4609 /* Handle a request to scan a file for malware */
4610 if (malware_test_file)
4612 #ifdef WITH_CONTENT_SCAN
4614 set_process_info("scanning file for malware");
4615 if ((result = malware_in_file(malware_test_file)) == FAIL)
4617 printf("No malware found.\n");
4622 printf("Malware lookup returned non-okay/fail: %d\n", result);
4626 printf("Malware found: %s\n", malware_name);
4628 printf("Malware scan detected malware of unknown name.\n");
4630 printf("Malware scanning not enabled at compile time.\n");
4635 /* Handle a request to list the delivery queue */
4639 set_process_info("listing the queue");
4640 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4644 /* Handle a request to count the delivery queue */
4648 set_process_info("counting the queue");
4649 fprintf(stdout, "%u\n", queue_count());
4653 /* Handle actions on specific messages, except for the force delivery and
4654 message load actions, which are done below. Some actions take a whole list of
4655 message ids, which are known to continue up to the end of the arguments. Others
4656 take a single message id and then operate on the recipients list. */
4658 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4660 int yield = EXIT_SUCCESS;
4661 set_process_info("acting on specified messages");
4663 /* ACL definitions may be needed when removing a message (-Mrm) because
4664 event_action gets expanded */
4666 if (msg_action == MSG_REMOVE)
4668 int old_pool = store_pool;
4669 store_pool = POOL_CONFIG;
4671 store_pool = old_pool;
4672 store_writeprotect(POOL_CONFIG);
4675 if (!one_msg_action)
4677 for (i = msg_action_arg; i < argc; i++)
4678 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4679 yield = EXIT_FAILURE;
4682 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4683 default: printf("\n"); break;
4687 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4688 recipients_arg)) yield = EXIT_FAILURE;
4692 /* We used to set up here to skip reading the ACL section, on
4693 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4694 Now, since the intro of the ${acl } expansion, ACL definitions may be
4695 needed in transports so we lost the optimisation. */
4698 int old_pool = store_pool;
4699 #ifdef MEASURE_TIMING
4700 struct timeval t0, diff;
4701 (void)gettimeofday(&t0, NULL);
4704 store_pool = POOL_CONFIG;
4706 store_pool = old_pool;
4708 /* -be can add macro definitions, needing to link to the macro structure
4709 chain. Otherwise, make the memory used for config data readonly. */
4711 if (!expansion_test)
4712 store_writeprotect(POOL_CONFIG);
4714 #ifdef MEASURE_TIMING
4715 report_time_since(&t0, US"readconf_rest (delta)");
4719 /* Handle a request to check quota */
4720 if (rcpt_verify_quota)
4721 if (real_uid != root_uid && real_uid != exim_uid)
4722 exim_fail("exim: Permission denied\n");
4723 else if (recipients_arg >= argc)
4724 exim_fail("exim: missing recipient for quota check\n");
4727 verify_quota(argv[recipients_arg]);
4728 exim_exit(EXIT_SUCCESS);
4731 /* Handle the -brt option. This is for checking out retry configurations.
4732 The next three arguments are a domain name or a complete address, and
4733 optionally two error numbers. All it does is to call the function that
4734 scans the retry configuration data. */
4736 if (test_retry_arg >= 0)
4738 retry_config *yield;
4739 int basic_errno = 0;
4741 const uschar *s1, *s2;
4743 if (test_retry_arg >= argc)
4745 printf("-brt needs a domain or address argument\n");
4746 exim_exit(EXIT_FAILURE);
4748 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4751 /* If the first argument contains no @ and no . it might be a local user
4752 or it might be a single-component name. Treat as a domain. */
4754 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4756 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4757 "being \ntreated as a one-component domain, not as a local part.\n\n",
4761 /* There may be an optional second domain arg. */
4763 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4764 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4766 /* The final arg is an error name */
4768 if (test_retry_arg < argc)
4770 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4772 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4775 printf("%s\n", CS error);
4776 return EXIT_FAILURE;
4779 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4780 code > 100 as an error is for matching codes to the decade. Turn them into
4781 a real error code, off the decade. */
4783 if (basic_errno == ERRNO_MAIL4XX ||
4784 basic_errno == ERRNO_RCPT4XX ||
4785 basic_errno == ERRNO_DATA4XX)
4787 int code = (more_errno >> 8) & 255;
4789 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4790 else if (code > 100)
4791 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4795 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4796 printf("No retry information found\n");
4799 more_errno = yield->more_errno;
4800 printf("Retry rule: %s ", yield->pattern);
4802 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4804 printf("quota%s%s ",
4805 (more_errno > 0)? "_" : "",
4806 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4808 else if (yield->basic_errno == ECONNREFUSED)
4810 printf("refused%s%s ",
4811 (more_errno > 0)? "_" : "",
4812 (more_errno == 'M')? "MX" :
4813 (more_errno == 'A')? "A" : "");
4815 else if (yield->basic_errno == ETIMEDOUT)
4818 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4820 if (more_errno != 0) printf("_%s",
4821 (more_errno == 'M')? "MX" : "A");
4824 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4825 printf("auth_failed ");
4828 for (retry_rule * r = yield->rules; r; r = r->next)
4830 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4831 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4837 printf(",%d.", x/1000);
4851 exim_exit(EXIT_SUCCESS);
4854 /* Handle a request to list one or more configuration options */
4855 /* If -n was set, we suppress some information */
4860 set_process_info("listing variables");
4861 if (recipients_arg >= argc)
4862 fail = !readconf_print(US"all", NULL, flag_n);
4863 else for (i = recipients_arg; i < argc; i++)
4866 (Ustrcmp(argv[i], "router") == 0 ||
4867 Ustrcmp(argv[i], "transport") == 0 ||
4868 Ustrcmp(argv[i], "authenticator") == 0 ||
4869 Ustrcmp(argv[i], "macro") == 0 ||
4870 Ustrcmp(argv[i], "environment") == 0))
4872 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4876 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4878 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4883 set_process_info("listing config");
4884 exim_exit(readconf_print(US"config", NULL, flag_n)
4885 ? EXIT_SUCCESS : EXIT_FAILURE);
4889 /* Initialise subsystems as required. */
4893 /* Handle a request to deliver one or more messages that are already on the
4894 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4895 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4897 Delivery of specific messages is typically used for a small number when
4898 prodding by hand (when the option forced_delivery will be set) or when
4899 re-execing to regain root privilege. Each message delivery must happen in a
4900 separate process, so we fork a process for each one, and run them sequentially
4901 so that debugging output doesn't get intertwined, and to avoid spawning too
4902 many processes if a long list is given. However, don't fork for the last one;
4903 this saves a process in the common case when Exim is called to deliver just one
4906 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4908 if (prod_requires_admin && !f.admin_user)
4910 fprintf(stderr, "exim: Permission denied\n");
4911 exim_exit(EXIT_FAILURE);
4913 set_process_info("delivering specified messages");
4914 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4915 for (i = msg_action_arg; i < argc; i++)
4919 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4920 that runs into a later copy into the untainted global message_id[] */
4921 /*XXX Do we need a length limit check here? */
4923 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4924 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4926 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4927 exim_underbar_exit(EXIT_SUCCESS);
4931 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4933 exim_exit(EXIT_FAILURE);
4937 exim_exit(EXIT_SUCCESS);
4941 /* If only a single queue run is requested, without SMTP listening, we can just
4942 turn into a queue runner, with an optional starting message id. */
4944 if (queue_interval == 0 && !f.daemon_listen)
4946 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4947 start_queue_run_id ? US" starting at " : US"",
4948 start_queue_run_id ? start_queue_run_id: US"",
4949 stop_queue_run_id ? US" stopping at " : US"",
4950 stop_queue_run_id ? stop_queue_run_id : US"");
4952 set_process_info("running the '%s' queue (single queue run)", queue_name);
4954 set_process_info("running the queue (single queue run)");
4955 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4956 exim_exit(EXIT_SUCCESS);
4960 /* Find the login name of the real user running this process. This is always
4961 needed when receiving a message, because it is written into the spool file. It
4962 may also be used to construct a from: or a sender: header, and in this case we
4963 need the user's full name as well, so save a copy of it, checked for RFC822
4964 syntax and munged if necessary, if it hasn't previously been set by the -F
4965 argument. We may try to get the passwd entry more than once, in case NIS or
4966 other delays are in evidence. Save the home directory for use in filter testing
4971 if ((pw = getpwuid(real_uid)) != NULL)
4973 originator_login = string_copy(US pw->pw_name);
4974 originator_home = string_copy(US pw->pw_dir);
4976 /* If user name has not been set by -F, set it from the passwd entry
4977 unless -f has been used to set the sender address by a trusted user. */
4979 if (!originator_name)
4981 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4983 uschar *name = US pw->pw_gecos;
4984 uschar *amp = Ustrchr(name, '&');
4987 /* Most Unix specify that a '&' character in the gecos field is
4988 replaced by a copy of the login name, and some even specify that
4989 the first character should be upper cased, so that's what we do. */
4994 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4995 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4996 buffer[loffset] = toupper(buffer[loffset]);
5000 /* If a pattern for matching the gecos field was supplied, apply
5001 it and then expand the name string. */
5003 if (gecos_pattern && gecos_name)
5005 const pcre2_code *re;
5006 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
5008 if (regex_match_and_setup(re, name, 0, -1))
5010 uschar *new_name = expand_string(gecos_name);
5014 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5015 "gecos field \"%s\"\n", new_name, name);
5018 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5019 "\"%s\": %s\n", gecos_name, expand_string_message);
5021 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5022 "gecos field \"%s\"\n", gecos_pattern, name);
5023 store_free((void *)re);
5025 originator_name = string_copy(name);
5028 /* A trusted caller has used -f but not -F */
5030 else originator_name = US"";
5033 /* Break the retry loop */
5038 if (++i > finduser_retries) break;
5042 /* If we cannot get a user login, log the incident and give up, unless the
5043 configuration specifies something to use. When running in the test harness,
5044 any setting of unknown_login overrides the actual name. */
5046 if (!originator_login || f.running_in_test_harness)
5050 originator_login = expand_string(unknown_login);
5051 if (!originator_name && unknown_username)
5052 originator_name = expand_string(unknown_username);
5053 if (!originator_name) originator_name = US"";
5055 if (!originator_login)
5056 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5060 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5063 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5065 /* If a message is created by this call of Exim, the uid/gid of its originator
5066 are those of the caller. These values are overridden if an existing message is
5067 read in from the spool. */
5069 originator_uid = real_uid;
5070 originator_gid = real_gid;
5072 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5073 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5075 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5076 returns. We leave this till here so that the originator_ fields are available
5077 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5080 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5084 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5085 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5086 "mua_wrapper is set");
5089 # ifndef DISABLE_TLS
5090 /* This also checks that the library linkage is working and we can call
5091 routines in it, so call even if tls_require_ciphers is unset */
5093 # ifdef MEASURE_TIMING
5094 struct timeval t0, diff;
5095 (void)gettimeofday(&t0, NULL);
5097 if (!tls_dropprivs_validate_require_cipher(FALSE))
5099 # ifdef MEASURE_TIMING
5100 report_time_since(&t0, US"validate_ciphers (delta)");
5108 /* If the sender ident has not been set (by a trusted caller) set it to
5109 the caller. This will get overwritten below for an inetd call. If a trusted
5110 caller has set it empty, unset it. */
5112 if (!sender_ident) sender_ident = originator_login;
5113 else if (!*sender_ident) sender_ident = NULL;
5115 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5116 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5117 originator_* variables set. */
5119 if (test_rewrite_arg >= 0)
5121 f.really_exim = FALSE;
5122 if (test_rewrite_arg >= argc)
5124 printf("-brw needs an address argument\n");
5125 exim_exit(EXIT_FAILURE);
5127 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5128 exim_exit(EXIT_SUCCESS);
5131 /* A locally-supplied message is considered to be coming from a local user
5132 unless a trusted caller supplies a sender address with -f, or is passing in the
5133 message via SMTP (inetd invocation or otherwise). */
5135 if ( !sender_address && !smtp_input
5136 || !f.trusted_caller && filter_test == FTEST_NONE)
5138 f.sender_local = TRUE;
5140 /* A trusted caller can supply authenticated_sender and authenticated_id
5141 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5142 defaults except when host checking. */
5144 if (!authenticated_sender && !host_checking)
5145 authenticated_sender = string_sprintf("%s@%s", originator_login,
5146 qualify_domain_sender);
5147 if (!authenticated_id && !host_checking)
5148 authenticated_id = originator_login;
5151 /* Trusted callers are always permitted to specify the sender address.
5152 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5153 is specified is the empty address. However, if a trusted caller does not
5154 specify a sender address for SMTP input, we leave sender_address unset. This
5155 causes the MAIL commands to be honoured. */
5157 if ( !smtp_input && !sender_address
5158 || !receive_check_set_sender(sender_address))
5160 /* Either the caller is not permitted to set a general sender, or this is
5161 non-SMTP input and the trusted caller has not set a sender. If there is no
5162 sender, or if a sender other than <> is set, override with the originator's
5163 login (which will get qualified below), except when checking things. */
5165 if ( !sender_address /* No sender_address set */
5167 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5168 !checking)) /* Not running tests, including filter tests */
5170 sender_address = originator_login;
5171 f.sender_address_forced = FALSE;
5172 sender_address_domain = 0;
5176 /* Remember whether an untrusted caller set the sender address */
5178 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5180 /* Ensure that the sender address is fully qualified unless it is the empty
5181 address, which indicates an error message, or doesn't exist (root caller, smtp
5182 interface, no -f argument). */
5184 if (sender_address && *sender_address && sender_address_domain == 0)
5185 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5186 qualify_domain_sender);
5188 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5190 /* Handle a request to verify a list of addresses, or test them for delivery.
5191 This must follow the setting of the sender address, since routers can be
5192 predicated upon the sender. If no arguments are given, read addresses from
5193 stdin. Set debug_level to at least D_v to get full output for address testing.
5196 if (verify_address_mode || f.address_test_mode)
5199 int flags = vopt_qualify;
5201 if (verify_address_mode)
5203 if (!verify_as_sender) flags |= vopt_is_recipient;
5204 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5209 flags |= vopt_is_recipient;
5210 debug_selector |= D_v;
5211 debug_file = stderr;
5212 debug_fd = fileno(debug_file);
5213 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5216 if (recipients_arg < argc)
5217 while (recipients_arg < argc)
5219 /* Supplied addresses are tainted since they come from a user */
5220 uschar * s = string_copy_taint(
5221 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5225 BOOL finished = FALSE;
5226 uschar *ss = parse_find_address_end(s, FALSE);
5227 if (*ss == ',') *ss = 0; else finished = TRUE;
5228 test_address(s, flags, &exit_value);
5231 while (*++s == ',' || isspace(*s)) ;
5237 uschar * s = get_stdinput(NULL, NULL);
5239 test_address(string_copy_taint(
5240 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5242 flags, &exit_value);
5246 exim_exit(exit_value);
5249 /* Handle expansion checking. Either expand items on the command line, or read
5250 from stdin if there aren't any. If -Mset was specified, load the message so
5251 that its variables can be used, but restrict this facility to admin users.
5252 Otherwise, if -bem was used, read a message from stdin. */
5256 dns_init(FALSE, FALSE, FALSE);
5257 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5261 exim_fail("exim: permission denied\n");
5262 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5263 /* Checking the length of the ID is sufficient to validate it.
5264 Get an untainted version so file opens can be done. */
5265 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5267 spoolname = string_sprintf("%s-H", message_id);
5268 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5269 printf ("Failed to load message datafile %s\n", message_id);
5270 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5271 printf ("Failed to load message %s\n", message_id);
5274 /* Read a test message from a file. We fudge it up to be on stdin, saving
5275 stdin itself for later reading of expansion strings. */
5277 else if (expansion_test_message)
5279 int save_stdin = dup(0);
5280 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5282 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5285 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5286 message_ended = END_NOTENDED;
5287 read_message_body(receive_msg(extract_recipients));
5288 message_linecount += body_linecount;
5289 (void)dup2(save_stdin, 0);
5290 (void)close(save_stdin);
5291 clearerr(stdin); /* Required by Darwin */
5294 /* Only admin users may see config-file macros this way */
5296 if (!f.admin_user) macros_user = macros = mlast = NULL;
5298 /* Allow $recipients for this testing */
5300 f.enable_dollar_recipients = TRUE;
5302 /* Expand command line items */
5304 if (recipients_arg < argc)
5305 while (recipients_arg < argc)
5306 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5312 char *(*fn_readline)(const char *) = NULL;
5313 void (*fn_addhist)(const char *) = NULL;
5317 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5320 while (s = get_stdinput(fn_readline, fn_addhist))
5321 expansion_test_line(s);
5324 if (dlhandle) dlclose(dlhandle);
5328 /* The data file will be open after -Mset */
5330 if (deliver_datafile >= 0)
5332 (void)close(deliver_datafile);
5333 deliver_datafile = -1;
5336 exim_exit(EXIT_SUCCESS);
5340 /* The active host name is normally the primary host name, but it can be varied
5341 for hosts that want to play several parts at once. We need to ensure that it is
5342 set for host checking, and for receiving messages. */
5344 smtp_active_hostname = primary_hostname;
5345 if (raw_active_hostname != NULL)
5347 uschar *nah = expand_string(raw_active_hostname);
5350 if (!f.expand_string_forcedfail)
5351 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5352 "(smtp_active_hostname): %s", raw_active_hostname,
5353 expand_string_message);
5355 else if (nah[0] != 0) smtp_active_hostname = nah;
5358 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5359 given IP address so that the blocking and relay configuration can be tested.
5360 Unless a sender_ident was set by -oMt, we discard it (the default is the
5361 caller's login name). An RFC 1413 call is made only if we are running in the
5362 test harness and an incoming interface and both ports are specified, because
5363 there is no TCP/IP call to find the ident for. */
5370 if (!sender_ident_set)
5372 sender_ident = NULL;
5373 if (f.running_in_test_harness && sender_host_port
5374 && interface_address && interface_port)
5375 verify_get_ident(1223); /* note hardwired port number */
5378 /* In case the given address is a non-canonical IPv6 address, canonicalize
5379 it. The code works for both IPv4 and IPv6, as it happens. */
5381 size = host_aton(sender_host_address, x);
5382 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5383 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5385 /* Now set up for testing */
5387 host_build_sender_fullhost();
5391 f.sender_local = FALSE;
5392 f.sender_host_notsocket = TRUE;
5393 debug_file = stderr;
5394 debug_fd = fileno(debug_file);
5395 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5396 "**** but without any ident (RFC 1413) callback.\n"
5397 "**** This is not for real!\n\n",
5398 sender_host_address);
5400 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5401 if (verify_check_host(&hosts_connection_nolog) == OK)
5402 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5403 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5405 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5406 because a log line has already been written for all its failure exists
5407 (usually "connection refused: <reason>") and writing another one is
5408 unnecessary clutter. */
5410 if (smtp_start_session())
5413 for (; (reset_point = store_mark()); store_reset(reset_point))
5415 if (smtp_setup_msg() <= 0) break;
5416 if (!receive_msg(FALSE)) break;
5418 return_path = sender_address = NULL;
5419 dnslist_domain = dnslist_matched = NULL;
5420 #ifndef DISABLE_DKIM
5421 dkim_cur_signer = NULL;
5424 deliver_localpart_orig = NULL;
5425 deliver_domain_orig = NULL;
5426 callout_address = sending_ip_address = NULL;
5427 deliver_localpart_data = deliver_domain_data =
5428 recipient_data = sender_data = NULL;
5429 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5433 exim_exit(EXIT_SUCCESS);
5437 /* Arrange for message reception if recipients or SMTP were specified;
5438 otherwise complain unless a version print (-bV) happened or this is a filter
5439 verification test or info dump.
5440 In the former case, show the configuration file name. */
5442 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5444 if (version_printed)
5446 if (Ustrchr(config_main_filelist, ':'))
5447 printf("Configuration file search path is %s\n", config_main_filelist);
5448 printf("Configuration file is %s\n", config_main_filename);
5449 return EXIT_SUCCESS;
5452 if (info_flag != CMDINFO_NONE)
5454 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5455 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5458 if (filter_test == FTEST_NONE)
5459 exim_usage(called_as);
5463 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5464 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5465 that we are not called from inetd, because that is rejected above. The
5466 following configuration settings are forced here:
5468 (1) Synchronous delivery (-odi)
5469 (2) Errors to stderr (-oep == -oeq)
5470 (3) No parallel remote delivery
5471 (4) Unprivileged delivery
5473 We don't force overall queueing options because there are several of them;
5474 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5475 to override any SMTP queueing. */
5479 f.synchronous_delivery = TRUE;
5480 arg_error_handling = ERRORS_STDERR;
5481 remote_max_parallel = 1;
5482 deliver_drop_privilege = TRUE;
5483 f.queue_smtp = FALSE;
5484 queue_smtp_domains = NULL;
5486 message_utf8_downconvert = -1; /* convert-if-needed */
5491 /* Prepare to accept one or more new messages on the standard input. When a
5492 message has been read, its id is returned in message_id[]. If doing immediate
5493 delivery, we fork a delivery process for each received message, except for the
5494 last one, where we can save a process switch.
5496 It is only in non-smtp mode that error_handling is allowed to be changed from
5497 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5498 sendmail error modes other than -oem ever actually used? Later: yes.) */
5500 if (!smtp_input) error_handling = arg_error_handling;
5502 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5503 logging being sent down the socket and make an identd call to get the
5506 else if (f.is_inetd)
5508 (void)fclose(stderr);
5509 exim_nullstd(); /* Re-open to /dev/null */
5510 verify_get_ident(IDENT_PORT);
5511 host_build_sender_fullhost();
5512 set_process_info("handling incoming connection from %s via inetd",
5516 /* If the sender host address has been set, build sender_fullhost if it hasn't
5517 already been done (which it will have been for inetd). This caters for the
5518 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5519 so that the test for IP options is skipped for -bs input. */
5521 if (sender_host_address && !sender_fullhost)
5523 host_build_sender_fullhost();
5524 set_process_info("handling incoming connection from %s via -oMa",
5526 f.sender_host_notsocket = TRUE;
5529 /* Otherwise, set the sender host as unknown except for inetd calls. This
5530 prevents host checking in the case of -bs not from inetd and also for -bS. */
5532 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5534 /* If stdout does not exist, then dup stdin to stdout. This can happen
5535 if exim is started from inetd. In this case fd 0 will be set to the socket,
5536 but fd 1 will not be set. This also happens for passed SMTP channels. */
5538 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5540 /* Set up the incoming protocol name and the state of the program. Root is
5541 allowed to force received protocol via the -oMr option above. If we have come
5542 via inetd, the process info has already been set up. We don't set
5543 received_protocol here for smtp input, as it varies according to
5544 batch/HELO/EHLO/AUTH/TLS. */
5548 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5549 smtp_batched_input? "batched " : "",
5550 sender_address ? sender_address : originator_login);
5554 int old_pool = store_pool;
5555 store_pool = POOL_PERM;
5556 if (!received_protocol)
5557 received_protocol = string_sprintf("local%s", called_as);
5558 store_pool = old_pool;
5559 set_process_info("accepting a local non-SMTP message from <%s>",
5563 /* Initialize the session_local_queue-only flag (this will be ignored if
5564 mua_wrapper is set) */
5567 session_local_queue_only = queue_only;
5569 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5570 the spool if so configured. On failure, we must not attempt to send an error
5571 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5572 error code is given.) */
5574 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5575 exim_fail("exim: insufficient disk space\n");
5577 /* If this is smtp input of any kind, real or batched, handle the start of the
5580 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5581 because a log line has already been written for all its failure exists
5582 (usually "connection refused: <reason>") and writing another one is
5583 unnecessary clutter. */
5589 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5590 if (verify_check_host(&hosts_connection_nolog) == OK)
5591 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5592 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5593 if (!smtp_start_session())
5596 exim_exit(EXIT_SUCCESS);
5600 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5601 (we handle buferring so as to have visibility of fill level). */
5605 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5606 if (expand_string_message)
5607 if (thismessage_size_limit == -1)
5608 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5609 "message_size_limit: %s", expand_string_message);
5611 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5612 "message_size_limit: %s", expand_string_message);
5614 setvbuf(stdin, NULL, _IONBF, 0);
5617 /* Loop for several messages when reading SMTP input. If we fork any child
5618 processes, we don't want to wait for them unless synchronous delivery is
5619 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5620 same as SIG_DFL, despite the fact that documentation often lists the default as
5621 "ignore". This is a confusing area. This is what I know:
5623 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5624 processes that complete simply to go away without ever becoming defunct. You
5625 can't then wait for them - but we don't want to wait for them in the
5626 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5627 happen for all OS (e.g. *BSD is different).
5629 But that's not the end of the story. Some (many? all?) systems have the
5630 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5631 has by default, so it seems that the difference is merely one of default
5632 (compare restarting vs non-restarting signals).
5634 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5635 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5636 of the loop below. Paranoia rules.
5638 February 2003: That's *still* not the end of the story. There are now versions
5639 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5640 process then calls waitpid(), a grumble is written to the system log, because
5641 this is logically inconsistent. In other words, it doesn't like the paranoia.
5642 As a consequence of this, the waitpid() below is now excluded if we are sure
5643 that SIG_IGN works. */
5645 if (!f.synchronous_delivery)
5648 struct sigaction act;
5649 act.sa_handler = SIG_IGN;
5650 sigemptyset(&(act.sa_mask));
5651 act.sa_flags = SA_NOCLDWAIT;
5652 sigaction(SIGCHLD, &act, NULL);
5654 signal(SIGCHLD, SIG_IGN);
5658 /* Save the current store pool point, for resetting at the start of
5659 each message, and save the real sender address, if any. */
5661 real_sender_address = sender_address;
5663 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5664 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5667 for (BOOL more = TRUE; more; )
5669 rmark reset_point = store_mark();
5672 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5673 input and build the recipients list, before calling receive_msg() to read the
5674 message proper. Whatever sender address is given in the SMTP transaction is
5675 often ignored for local senders - we use the actual sender, which is normally
5676 either the underlying user running this process or a -f argument provided by
5677 a trusted caller. It is saved in real_sender_address. The test for whether to
5678 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5683 if ((rc = smtp_setup_msg()) > 0)
5685 if (real_sender_address != NULL &&
5686 !receive_check_set_sender(sender_address))
5688 sender_address = raw_sender = real_sender_address;
5689 sender_address_unrewritten = NULL;
5692 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5693 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5694 the very end. The result of the ACL is ignored (as for other non-SMTP
5695 messages). It is run for its potential side effects. */
5697 if (smtp_batched_input && acl_not_smtp_start != NULL)
5699 uschar *user_msg, *log_msg;
5700 f.enable_dollar_recipients = TRUE;
5701 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5702 &user_msg, &log_msg);
5703 f.enable_dollar_recipients = FALSE;
5706 /* Now get the data for the message */
5708 more = receive_msg(extract_recipients);
5711 cancel_cutthrough_connection(TRUE, US"receive dropped");
5712 if (more) goto MORELOOP;
5713 smtp_log_no_mail(); /* Log no mail if configured */
5714 exim_exit(EXIT_FAILURE);
5719 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5720 smtp_log_no_mail(); /* Log no mail if configured */
5721 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5725 /* In the non-SMTP case, we have all the information from the command
5726 line, but must process it in case it is in the more general RFC822
5727 format, and in any case, to detect syntax errors. Also, it appears that
5728 the use of comma-separated lists as single arguments is common, so we
5729 had better support them. */
5734 int count = argc - recipients_arg;
5735 uschar **list = argv + recipients_arg;
5737 /* These options cannot be changed dynamically for non-SMTP messages */
5739 f.active_local_sender_retain = local_sender_retain;
5740 f.active_local_from_check = local_from_check;
5742 /* Save before any rewriting */
5744 raw_sender = string_copy(sender_address);
5746 /* Loop for each argument (supplied by user hence tainted) */
5748 for (int i = 0; i < count; i++)
5750 int start, end, domain;
5752 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5753 * We'll still want to cap it to something, just in case. */
5754 uschar * s = string_copy_taint(
5755 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5758 /* Loop for each comma-separated address */
5762 BOOL finished = FALSE;
5764 uschar *ss = parse_find_address_end(s, FALSE);
5766 if (*ss == ',') *ss = 0; else finished = TRUE;
5768 /* Check max recipients - if -t was used, these aren't recipients */
5770 if (recipients_max > 0 && ++rcount > recipients_max &&
5771 !extract_recipients)
5772 if (error_handling == ERRORS_STDERR)
5774 fprintf(stderr, "exim: too many recipients\n");
5775 exim_exit(EXIT_FAILURE);
5779 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5780 errors_sender_rc : EXIT_FAILURE;
5784 BOOL b = allow_utf8_domains;
5785 allow_utf8_domains = TRUE;
5788 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5792 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5793 else allow_utf8_domains = b;
5798 if (domain == 0 && !f.allow_unqualified_recipient)
5801 errmess = US"unqualified recipient address not allowed";
5805 if (error_handling == ERRORS_STDERR)
5807 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5808 string_printing(list[i]), errmess);
5809 exim_exit(EXIT_FAILURE);
5815 eblock.text1 = string_printing(list[i]);
5816 eblock.text2 = errmess;
5818 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5819 errors_sender_rc : EXIT_FAILURE;
5822 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5825 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5829 /* Show the recipients when debugging */
5833 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5834 if (recipients_list)
5836 debug_printf("Recipients:\n");
5837 for (int i = 0; i < recipients_count; i++)
5838 debug_printf(" %s\n", recipients_list[i].address);
5842 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5843 ignored; rejecting here would just add complication, and it can just as
5844 well be done later. Allow $recipients to be visible in the ACL. */
5846 if (acl_not_smtp_start)
5848 uschar *user_msg, *log_msg;
5849 f.enable_dollar_recipients = TRUE;
5850 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5851 &user_msg, &log_msg);
5852 f.enable_dollar_recipients = FALSE;
5855 /* Pause for a while waiting for input. If none received in that time,
5856 close the logfile, if we had one open; then if we wait for a long-running
5857 datasource (months, in one use-case) log rotation will not leave us holding
5860 if (!receive_timeout)
5861 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5864 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5865 will just read the headers for the message, and not write anything onto the
5868 message_ended = END_NOTENDED;
5869 more = receive_msg(extract_recipients);
5871 /* more is always FALSE here (not SMTP message) when reading a message
5872 for real; when reading the headers of a message for filter testing,
5873 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5875 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5876 } /* Non-SMTP message reception */
5878 /* If this is a filter testing run, there are headers in store, but
5879 no message on the spool. Run the filtering code in testing mode, setting
5880 the domain to the qualify domain and the local part to the current user,
5881 unless they have been set by options. The prefix and suffix are left unset
5882 unless specified. The the return path is set to to the sender unless it has
5883 already been set from a return-path header in the message. */
5885 if (filter_test != FTEST_NONE)
5887 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5888 deliver_domain_orig = deliver_domain;
5889 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5890 deliver_localpart_orig = deliver_localpart;
5891 deliver_localpart_prefix = US ftest_prefix;
5892 deliver_localpart_suffix = US ftest_suffix;
5893 deliver_home = originator_home;
5897 printf("Return-path copied from sender\n");
5898 return_path = string_copy(sender_address);
5901 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5902 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5904 receive_add_recipient(
5905 string_sprintf("%s%s%s@%s",
5906 ftest_prefix ? ftest_prefix : US"",
5908 ftest_suffix ? ftest_suffix : US"",
5909 deliver_domain), -1);
5911 printf("Recipient = %s\n", recipients_list[0].address);
5912 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5913 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5915 if (chdir("/")) /* Get away from wherever the user is running this from */
5917 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5918 exim_exit(EXIT_FAILURE);
5921 /* Now we run either a system filter test, or a user filter test, or both.
5922 In the latter case, headers added by the system filter will persist and be
5923 available to the user filter. We need to copy the filter variables
5926 if (filter_test & FTEST_SYSTEM)
5927 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5928 exim_exit(EXIT_FAILURE);
5930 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5932 if (filter_test & FTEST_USER)
5933 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5934 exim_exit(EXIT_FAILURE);
5936 exim_exit(EXIT_SUCCESS);
5939 /* Else act on the result of message reception. We should not get here unless
5940 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5941 will be TRUE. If it is not, check on the number of messages received in this
5944 if ( !session_local_queue_only
5945 && smtp_accept_queue_per_connection > 0
5946 && receive_messagecount > smtp_accept_queue_per_connection)
5948 session_local_queue_only = TRUE;
5949 queue_only_reason = 2;
5952 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5953 and queue_only_load is set, check that the load average is below it. If it is
5954 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5955 default), we put the whole session into queue_only mode. It then remains this
5956 way for any subsequent messages on the same SMTP connection. This is a
5957 deliberate choice; even though the load average may fall, it doesn't seem
5958 right to deliver later messages on the same call when not delivering earlier
5959 ones. However, there are odd cases where this is not wanted, so this can be
5960 changed by setting queue_only_load_latch false. */
5962 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5963 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5965 queue_only_reason = 3;
5966 if (queue_only_load_latch) session_local_queue_only = TRUE;
5969 /* If running as an MUA wrapper, all queueing options and freezing options
5973 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5975 /* Log the queueing here, when it will get a message id attached, but
5976 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5979 if (local_queue_only)
5981 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5982 switch(queue_only_reason)
5985 log_write(L_delay_delivery,
5986 LOG_MAIN, "no immediate delivery: more than %d messages "
5987 "received in one connection", smtp_accept_queue_per_connection);
5991 log_write(L_delay_delivery,
5992 LOG_MAIN, "no immediate delivery: load average %.2f",
5993 (double)load_average/1000.0);
5998 else if (f.queue_only_policy || f.deliver_freeze)
5999 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6001 /* Else do the delivery unless the ACL or local_scan() called for queue only
6002 or froze the message. Always deliver in a separate process. A fork failure is
6003 not a disaster, as the delivery will eventually happen on a subsequent queue
6004 run. The search cache must be tidied before the fork, as the parent will
6005 do it before exiting. The child will trigger a lookup failure and
6006 thereby defer the delivery if it tries to use (for example) a cached ldap
6007 connection that the parent has called unbind on. */
6014 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6017 close_unwanted(); /* Close unwanted file descriptors and TLS */
6018 exim_nullstd(); /* Ensure std{in,out,err} exist */
6020 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6021 mode, deliver_drop_privilege is forced TRUE). */
6023 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6025 delivery_re_exec(CEE_EXEC_EXIT);
6026 /* Control does not return here. */
6029 /* No need to re-exec */
6031 rc = deliver_message(message_id, FALSE, FALSE);
6033 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6034 ? EXIT_SUCCESS : EXIT_FAILURE);
6039 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6040 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6041 "process: %s", strerror(errno));
6045 release_cutthrough_connection(US"msg passed for delivery");
6047 /* In the parent, wait if synchronous delivery is required. This will
6048 always be the case in MUA wrapper mode. */
6050 if (f.synchronous_delivery)
6053 while (wait(&status) != pid);
6054 if ((status & 0x00ff) != 0)
6055 log_write(0, LOG_MAIN|LOG_PANIC,
6056 "process %d crashed with signal %d while delivering %s",
6057 (int)pid, status & 0x00ff, message_id);
6058 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6063 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6064 automatically reaps children (see comments above the loop), clear away any
6065 finished subprocesses here, in case there are lots of messages coming in
6066 from the same source. */
6068 #ifndef SIG_IGN_WORKS
6069 while (waitpid(-1, NULL, WNOHANG) > 0);
6073 return_path = sender_address = NULL;
6074 authenticated_sender = NULL;
6075 deliver_localpart_orig = NULL;
6076 deliver_domain_orig = NULL;
6077 deliver_host = deliver_host_address = NULL;
6078 dnslist_domain = dnslist_matched = NULL;
6079 #ifdef WITH_CONTENT_SCAN
6080 malware_name = NULL;
6082 callout_address = NULL;
6083 sending_ip_address = NULL;
6084 deliver_localpart_data = deliver_domain_data =
6085 recipient_data = sender_data = NULL;
6087 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6089 store_reset(reset_point);
6092 exim_exit(EXIT_SUCCESS); /* Never returns */
6093 return 0; /* To stop compiler warning */