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>
24 # include <execinfo.h>
28 # include <gnutls/gnutls.h>
29 # if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP)
34 extern void init_lookup_list(void);
38 /*************************************************
39 * Function interface to store functions *
40 *************************************************/
42 /* We need some real functions to pass to the PCRE regular expression library
43 for store allocation via Exim's store manager. The normal calls are actually
44 macros that pass over location information to make tracing easier. These
45 functions just interface to the standard macro calls. A good compiler will
46 optimize out the tail recursion and so not make them too expensive. */
49 function_store_malloc(PCRE2_SIZE size, void * tag)
51 return store_malloc((int)size);
55 function_store_free(void * block, void * tag)
57 /* At least some version of pcre2 pass a null pointer */
58 if (block) store_free(block);
63 function_store_get(PCRE2_SIZE size, void * tag)
65 return store_get((int)size, GET_UNTAINTED); /* loses track of taint */
69 function_store_nullfree(void * block, void * tag)
76 /*************************************************
77 * Enums for cmdline interface *
78 *************************************************/
80 enum commandline_info { CMDINFO_NONE=0,
81 CMDINFO_HELP, CMDINFO_SIEVE, CMDINFO_DSCP };
89 pcre_mlc_ctx = pcre2_general_context_create(function_store_malloc, function_store_free, NULL);
90 pcre_gen_ctx = pcre2_general_context_create(function_store_get, function_store_nullfree, NULL);
92 pcre_mlc_cmp_ctx = pcre2_compile_context_create(pcre_mlc_ctx);
93 pcre_gen_cmp_ctx = pcre2_compile_context_create(pcre_gen_ctx);
95 pcre_gen_mtc_ctx = pcre2_match_context_create(pcre_gen_ctx);
101 /*************************************************
102 * Execute regular expression and set strings *
103 *************************************************/
105 /* This function runs a regular expression match, and sets up the pointers to
106 the matched substrings. The matched strings are copied so the lifetime of
107 the subject is not a problem.
110 re the compiled expression
111 subject the subject string
112 options additional PCRE options
113 setup if < 0 do full setup
114 if >= 0 setup from setup+1 onwards,
115 excluding the full matched string
117 Returns: TRUE if matched, or FALSE
121 regex_match_and_setup(const pcre2_code * re, const uschar * subject, int options, int setup)
123 pcre2_match_data * md = pcre2_match_data_create_from_pattern(re, pcre_gen_ctx);
124 int res = pcre2_match(re, (PCRE2_SPTR)subject, PCRE2_ZERO_TERMINATED, 0,
125 PCRE_EOPT | options, md, pcre_gen_mtc_ctx);
128 if ((yield = (res >= 0)))
130 res = pcre2_get_ovector_count(md);
131 expand_nmax = setup < 0 ? 0 : setup + 1;
132 for (int matchnum = setup < 0 ? 0 : 1; matchnum < res; matchnum++)
135 pcre2_substring_get_bynumber(md, matchnum,
136 (PCRE2_UCHAR **)&expand_nstring[expand_nmax], &len);
137 expand_nlength[expand_nmax++] = (int)len;
141 else if (res != PCRE2_ERROR_NOMATCH) DEBUG(D_any)
144 pcre2_get_error_message(res, errbuf, sizeof(errbuf));
145 debug_printf_indent("pcre2: %s\n", errbuf);
147 /* pcre2_match_data_free(md); gen ctx needs no free */
152 /* Check just for match with regex. Uses the common memory-handling.
156 subject string to be checked
157 slen length of subject; -1 for nul-terminated
158 rptr pointer for matched string, copied, or NULL
160 Return: TRUE for a match.
164 regex_match(const pcre2_code * re, const uschar * subject, int slen, uschar ** rptr)
166 pcre2_match_data * md = pcre2_match_data_create(1, pcre_gen_ctx);
167 int rc = pcre2_match(re, (PCRE2_SPTR)subject,
168 slen >= 0 ? slen : PCRE2_ZERO_TERMINATED,
169 0, PCRE_EOPT, md, pcre_gen_mtc_ctx);
170 PCRE2_SIZE * ovec = pcre2_get_ovector_pointer(md);
176 *rptr = string_copyn(subject + ovec[0], ovec[1] - ovec[0]);
179 /* pcre2_match_data_free(md); gen ctx needs no free */
185 /*************************************************
186 * Set up processing details *
187 *************************************************/
189 /* Save a text string for dumping when SIGUSR1 is received.
190 Do checks for overruns.
192 Arguments: format and arguments, as for printf()
197 set_process_info(const char *format, ...)
199 gstring gs = { .size = PROCESS_INFO_SIZE - 2, .ptr = 0, .s = process_info };
204 g = string_fmt_append(&gs, "%5d ", (int)getpid());
206 va_start(ap, format);
207 if (!string_vformat(g, 0, format, ap))
210 g = string_cat(&gs, US"**** string overflowed buffer ****");
212 g = string_catn(g, US"\n", 1);
213 string_from_gstring(g);
214 process_info_len = g->ptr;
215 DEBUG(D_process_info) debug_printf("set_process_info: %s", process_info);
219 /***********************************************
220 * Handler for SIGTERM *
221 ***********************************************/
224 term_handler(int sig)
230 /***********************************************
231 * Handler for SIGSEGV *
232 ***********************************************/
234 #define STACKDUMP_MAX 24
239 void * buf[STACKDUMP_MAX];
241 int nptrs = backtrace(buf, STACKDUMP_MAX);
243 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace\n");
244 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
245 if ((ss = backtrace_symbols(buf, nptrs)))
247 for (int i = 0; i < nptrs; i++)
248 log_write(0, LOG_MAIN|LOG_PANIC, "\t%s\n", ss[i]);
252 log_write(0, LOG_MAIN|LOG_PANIC, "backtrace_symbols: %s\n", strerror(errno));
253 log_write(0, LOG_MAIN|LOG_PANIC, "---\n");
261 segv_handler(int sig, siginfo_t * info, void * uctx)
263 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (fault address: %p)", info->si_addr);
264 # if defined(SEGV_MAPERR) && defined(SEGV_ACCERR) && defined(SEGV_BNDERR) && defined(SEGV_PKUERR)
265 switch (info->si_code)
267 case SEGV_MAPERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_MAPERR"); break;
268 case SEGV_ACCERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_ACCERR"); break;
269 case SEGV_BNDERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_BNDERR"); break;
270 case SEGV_PKUERR: log_write(0, LOG_MAIN|LOG_PANIC, "SEGV_PKUERR"); break;
273 if (US info->si_addr < US 4096)
274 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (null pointer indirection)");
276 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
277 if (process_info_len > 0)
278 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
280 signal(SIGSEGV, SIG_DFL);
285 segv_handler(int sig)
287 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (maybe attempt to write to immutable memory)");
288 if (process_info_len > 0)
289 log_write(0, LOG_MAIN|LOG_PANIC, "SIGSEGV (%.*s)", process_info_len, process_info);
291 signal(SIGSEGV, SIG_DFL);
297 /*************************************************
298 * Handler for SIGUSR1 *
299 *************************************************/
301 /* SIGUSR1 causes any exim process to write to the process log details of
302 what it is currently doing. It will only be used if the OS is capable of
303 setting up a handler that causes automatic restarting of any system call
304 that is in progress at the time.
306 This function takes care to be signal-safe.
308 Argument: the signal number (SIGUSR1)
313 usr1_handler(int sig)
317 os_restarting_signal(sig, usr1_handler);
319 if (!process_log_path) return;
320 fd = log_open_as_exim(process_log_path);
322 /* If we are neither exim nor root, or if we failed to create the log file,
323 give up. There is not much useful we can do with errors, since we don't want
324 to disrupt whatever is going on outside the signal handler. */
328 (void)write(fd, process_info, process_info_len);
334 /*************************************************
336 *************************************************/
338 /* This handler is enabled most of the time that Exim is running. The handler
339 doesn't actually get used unless alarm() has been called to set a timer, to
340 place a time limit on a system call of some kind. When the handler is run, it
343 There are some other SIGALRM handlers that are used in special cases when more
344 than just a flag setting is required; for example, when reading a message's
345 input. These are normally set up in the code module that uses them, and the
346 SIGALRM handler is reset to this one afterwards.
348 Argument: the signal value (SIGALRM)
353 sigalrm_handler(int sig)
356 os_non_restarting_signal(SIGALRM, sigalrm_handler);
361 /*************************************************
362 * Sleep for a fractional time interval *
363 *************************************************/
365 /* This function is called by millisleep() and exim_wait_tick() to wait for a
366 period of time that may include a fraction of a second. The coding is somewhat
367 tedious. We do not expect setitimer() ever to fail, but if it does, the process
368 will wait for ever, so we panic in this instance. (There was a case of this
369 when a bug in a function that calls milliwait() caused it to pass invalid data.
370 That's when I added the check. :-)
372 We assume it to be not worth sleeping for under 50us; this value will
373 require revisiting as hardware advances. This avoids the issue of
374 a zero-valued timer setting meaning "never fire".
376 Argument: an itimerval structure containing the interval
381 milliwait(struct itimerval *itval)
384 sigset_t old_sigmask;
385 int save_errno = errno;
387 if (itval->it_value.tv_usec < 50 && itval->it_value.tv_sec == 0)
389 (void)sigemptyset(&sigmask); /* Empty mask */
390 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
391 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
392 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
393 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
394 "setitimer() failed: %s", strerror(errno));
395 (void)sigfillset(&sigmask); /* All signals */
396 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
397 (void)sigsuspend(&sigmask); /* Until SIGALRM */
398 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
400 sigalrm_seen = FALSE;
406 /*************************************************
407 * Millisecond sleep function *
408 *************************************************/
410 /* The basic sleep() function has a granularity of 1 second, which is too rough
411 in some cases - for example, when using an increasing delay to slow down
414 Argument: number of millseconds
421 struct itimerval itval = {.it_interval = {.tv_sec = 0, .tv_usec = 0},
422 .it_value = {.tv_sec = msec/1000,
423 .tv_usec = (msec % 1000) * 1000}};
429 /*************************************************
430 * Compare microsecond times *
431 *************************************************/
438 Returns: -1, 0, or +1
442 exim_tvcmp(struct timeval *t1, struct timeval *t2)
444 if (t1->tv_sec > t2->tv_sec) return +1;
445 if (t1->tv_sec < t2->tv_sec) return -1;
446 if (t1->tv_usec > t2->tv_usec) return +1;
447 if (t1->tv_usec < t2->tv_usec) return -1;
454 /*************************************************
455 * Clock tick wait function *
456 *************************************************/
458 #ifdef _POSIX_MONOTONIC_CLOCK
459 # ifdef CLOCK_BOOTTIME
460 # define EXIM_CLOCKTYPE CLOCK_BOOTTIME
462 # define EXIM_CLOCKTYPE CLOCK_MONOTONIC
465 /* Amount EXIM_CLOCK is behind realtime, at startup. */
466 static struct timespec offset_ts;
469 exim_clock_init(void)
472 if (clock_gettime(EXIM_CLOCKTYPE, &offset_ts) != 0) return;
473 (void)gettimeofday(&tv, NULL);
474 offset_ts.tv_sec = tv.tv_sec - offset_ts.tv_sec;
475 offset_ts.tv_nsec = tv.tv_usec * 1000 - offset_ts.tv_nsec;
476 if (offset_ts.tv_nsec >= 0) return;
478 offset_ts.tv_nsec += 1000*1000*1000;
484 exim_gettime(struct timeval * tv)
486 #ifdef _POSIX_MONOTONIC_CLOCK
487 struct timespec now_ts;
489 if (clock_gettime(EXIM_CLOCKTYPE, &now_ts) == 0)
491 now_ts.tv_sec += offset_ts.tv_sec;
492 if ((now_ts.tv_nsec += offset_ts.tv_nsec) >= 1000*1000*1000)
495 now_ts.tv_nsec -= 1000*1000*1000;
497 tv->tv_sec = now_ts.tv_sec;
498 tv->tv_usec = now_ts.tv_nsec / 1000;
502 (void)gettimeofday(tv, NULL);
506 /* Exim uses a time + a pid to generate a unique identifier in two places: its
507 message IDs, and in file names for maildir deliveries. Because some OS now
508 re-use pids within the same second, sub-second times are now being used.
509 However, for absolute certainty, we must ensure the clock has ticked before
510 allowing the relevant process to complete. At the time of implementation of
511 this code (February 2003), the speed of processors is such that the clock will
512 invariably have ticked already by the time a process has done its job. This
513 function prepares for the time when things are faster - and it also copes with
514 clocks that go backwards.
517 prev_tv A timeval which was used to create uniqueness; its usec field
518 has been rounded down to the value of the resolution.
519 We want to be sure the current time is greater than this.
520 On return, updated to current (rounded down).
521 resolution The resolution that was used to divide the microseconds
522 (1 for maildir, larger for message ids)
528 exim_wait_tick(struct timeval * prev_tv, int resolution)
530 struct timeval now_tv;
531 long int now_true_usec;
533 exim_gettime(&now_tv);
534 now_true_usec = now_tv.tv_usec;
535 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
537 while (exim_tvcmp(&now_tv, prev_tv) <= 0)
539 struct itimerval itval;
540 itval.it_interval.tv_sec = 0;
541 itval.it_interval.tv_usec = 0;
542 itval.it_value.tv_sec = prev_tv->tv_sec - now_tv.tv_sec;
543 itval.it_value.tv_usec = prev_tv->tv_usec + resolution - now_true_usec;
545 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
546 negative value for the microseconds is possible only in the case when "now"
547 is more than a second less than "tgt". That means that itval.it_value.tv_sec
548 is greater than zero. The following correction is therefore safe. */
550 if (itval.it_value.tv_usec < 0)
552 itval.it_value.tv_usec += 1000000;
553 itval.it_value.tv_sec -= 1;
556 DEBUG(D_transport|D_receive)
558 if (!f.running_in_test_harness)
560 debug_printf("tick check: " TIME_T_FMT ".%06lu " TIME_T_FMT ".%06lu\n",
561 prev_tv->tv_sec, (long) prev_tv->tv_usec,
562 now_tv.tv_sec, (long) now_tv.tv_usec);
563 debug_printf("waiting " TIME_T_FMT ".%06lu sec\n",
564 itval.it_value.tv_sec, (long) itval.it_value.tv_usec);
570 /* Be prapared to go around if the kernel does not implement subtick
571 granularity (GNU Hurd) */
573 exim_gettime(&now_tv);
574 now_true_usec = now_tv.tv_usec;
575 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
583 /*************************************************
584 * Call fopen() with umask 777 and adjust mode *
585 *************************************************/
587 /* Exim runs with umask(0) so that files created with open() have the mode that
588 is specified in the open() call. However, there are some files, typically in
589 the spool directory, that are created with fopen(). They end up world-writeable
590 if no precautions are taken. Although the spool directory is not accessible to
591 the world, this is an untidiness. So this is a wrapper function for fopen()
592 that sorts out the mode of the created file.
595 filename the file name
596 options the fopen() options
597 mode the required mode
599 Returns: the fopened FILE or NULL
603 modefopen(const uschar *filename, const char *options, mode_t mode)
605 mode_t saved_umask = umask(0777);
606 FILE *f = Ufopen(filename, options);
607 (void)umask(saved_umask);
608 if (f != NULL) (void)fchmod(fileno(f), mode);
613 /*************************************************
614 * Ensure stdin, stdout, and stderr exist *
615 *************************************************/
617 /* Some operating systems grumble if an exec() happens without a standard
618 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
619 file will be opened and will use these fd values, and then some other bit of
620 code will assume, for example, that it can write error messages to stderr.
621 This function ensures that fds 0, 1, and 2 are open if they do not already
622 exist, by connecting them to /dev/null.
624 This function is also used to ensure that std{in,out,err} exist at all times,
625 so that if any library that Exim calls tries to use them, it doesn't crash.
636 for (int i = 0; i <= 2; i++)
638 if (fstat(i, &statbuf) < 0 && errno == EBADF)
640 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
641 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
642 string_open_failed("/dev/null", NULL));
643 if (devnull != i) (void)dup2(devnull, i);
646 if (devnull > 2) (void)close(devnull);
652 /*************************************************
653 * Close unwanted file descriptors for delivery *
654 *************************************************/
656 /* This function is called from a new process that has been forked to deliver
657 an incoming message, either directly, or using exec.
659 We want any smtp input streams to be closed in this new process. However, it
660 has been observed that using fclose() here causes trouble. When reading in -bS
661 input, duplicate copies of messages have been seen. The files will be sharing a
662 file pointer with the parent process, and it seems that fclose() (at least on
663 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
664 least sometimes. Hence we go for closing the underlying file descriptors.
666 If TLS is active, we want to shut down the TLS library, but without molesting
667 the parent's SSL connection.
669 For delivery of a non-SMTP message, we want to close stdin and stdout (and
670 stderr unless debugging) because the calling process might have set them up as
671 pipes and be waiting for them to close before it waits for the submission
672 process to terminate. If they aren't closed, they hold up the calling process
673 until the initial delivery process finishes, which is not what we want.
675 Exception: We do want it for synchronous delivery!
677 And notwithstanding all the above, if D_resolver is set, implying resolver
678 debugging, leave stdout open, because that's where the resolver writes its
681 When we close stderr (which implies we've also closed stdout), we also get rid
682 of any controlling terminal.
694 tls_close(NULL, TLS_NO_SHUTDOWN); /* Shut down the TLS library */
696 (void)close(fileno(smtp_in));
697 (void)close(fileno(smtp_out));
702 (void)close(0); /* stdin */
703 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
704 if (debug_selector == 0) /* stderr */
706 if (!f.synchronous_delivery)
719 /*************************************************
721 *************************************************/
723 /* This function sets a new uid and gid permanently, optionally calling
724 initgroups() to set auxiliary groups. There are some special cases when running
725 Exim in unprivileged modes. In these situations the effective uid will not be
726 root; if we already have the right effective uid/gid, and don't need to
727 initialize any groups, leave things as they are.
732 igflag TRUE if initgroups() wanted
733 msg text to use in debugging output and failure log
735 Returns: nothing; bombs out on failure
739 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, const uschar * msg)
741 uid_t euid = geteuid();
742 gid_t egid = getegid();
744 if (euid == root_uid || euid != uid || egid != gid || igflag)
746 /* At least one OS returns +1 for initgroups failure, so just check for
751 struct passwd *pw = getpwuid(uid);
753 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
754 "no passwd entry for uid=%ld", (long int)uid);
756 if (initgroups(pw->pw_name, gid) != 0)
757 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
758 (long int)uid, strerror(errno));
761 if (setgid(gid) < 0 || setuid(uid) < 0)
762 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
763 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
766 /* Debugging output included uid/gid and all groups */
770 int group_count, save_errno;
771 gid_t group_list[EXIM_GROUPLIST_SIZE];
772 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
773 (long int)geteuid(), (long int)getegid(), (long int)getpid());
774 group_count = getgroups(nelem(group_list), group_list);
776 debug_printf(" auxiliary group list:");
778 for (int i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
779 else if (group_count < 0)
780 debug_printf(" <error: %s>", strerror(save_errno));
781 else debug_printf(" <none>");
789 /*************************************************
791 *************************************************/
793 /* Exim exits via this function so that it always clears up any open
799 Returns: does not return
808 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
809 ">>>>>>>>>>>>>>>>\n",
810 (int)getpid(), process_purpose, rc);
816 exim_underbar_exit(int rc)
820 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d (%s) terminating with rc=%d "
821 ">>>>>>>>>>>>>>>>\n",
822 (int)getpid(), process_purpose, rc);
828 /* Print error string, then die */
830 exim_fail(const char * fmt, ...)
834 vfprintf(stderr, fmt, ap);
838 /* fail if a length is too long */
840 exim_len_fail_toolong(int itemlen, int maxlen, const char *description)
842 if (itemlen <= maxlen)
844 fprintf(stderr, "exim: length limit exceeded (%d > %d) for: %s\n",
845 itemlen, maxlen, description);
849 /* only pass through the string item back to the caller if it's short enough */
850 static inline const uschar *
851 exim_str_fail_toolong(const uschar *item, int maxlen, const char *description)
853 exim_len_fail_toolong(Ustrlen(item), maxlen, description);
857 /* exim_chown_failure() called from exim_chown()/exim_fchown() on failure
858 of chown()/fchown(). See src/functions.h for more explanation */
860 exim_chown_failure(int fd, const uschar *name, uid_t owner, gid_t group)
862 int saved_errno = errno; /* from the preceeding chown call */
864 log_write(0, LOG_MAIN|LOG_PANIC,
865 __FILE__ ":%d: chown(%s, %d:%d) failed (%s)."
866 " Please contact the authors and refer to https://bugs.exim.org/show_bug.cgi?id=2391",
867 __LINE__, name?name:US"<unknown>", owner, group, strerror(errno));
869 /* I leave this here, commented, in case the "bug"(?) comes up again.
870 It is not an Exim bug, but we can provide a workaround.
876 if (0 == (fd < 0 ? stat(name, &buf) : fstat(fd, &buf)))
878 if (buf.st_uid == owner && buf.st_gid == group) return 0;
879 log_write(0, LOG_MAIN|LOG_PANIC, "Wrong ownership on %s", name);
881 else log_write(0, LOG_MAIN|LOG_PANIC, "Stat failed on %s: %s", name, strerror(errno));
889 /*************************************************
890 * Extract port from host address *
891 *************************************************/
893 /* Called to extract the port from the values given to -oMa and -oMi.
894 It also checks the syntax of the address, and terminates it before the
895 port data when a port is extracted.
898 address the address, with possible port on the end
900 Returns: the port, or zero if there isn't one
901 bombs out on a syntax error
905 check_port(uschar *address)
907 int port = host_address_extract_port(address);
908 if (string_is_ip_address(address, NULL) == 0)
909 exim_fail("exim abandoned: \"%s\" is not an IP address\n", address);
915 /*************************************************
916 * Test/verify an address *
917 *************************************************/
919 /* This function is called by the -bv and -bt code. It extracts a working
920 address from a full RFC 822 address. This isn't really necessary per se, but it
921 has the effect of collapsing source routes.
925 flags flag bits for verify_address()
926 exit_value to be set for failures
932 test_address(uschar *s, int flags, int *exit_value)
934 int start, end, domain;
935 uschar *parse_error = NULL;
936 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
940 fprintf(stdout, "syntax error: %s\n", parse_error);
945 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
946 -1, -1, NULL, NULL, NULL);
947 if (rc == FAIL) *exit_value = 2;
948 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
954 /*************************************************
955 * Show supported features *
956 *************************************************/
959 show_string(BOOL is_stdout, gstring * g)
961 const uschar * s = string_from_gstring(g);
963 if (is_stdout) fputs(CCS s, stdout);
964 else debug_printf("%s", s);
969 show_db_version(gstring * g)
971 #ifdef DB_VERSION_STRING
974 g = string_fmt_append(g, "Library version: BDB: Compile: %s\n", DB_VERSION_STRING);
975 g = string_fmt_append(g, " Runtime: %s\n",
976 db_version(NULL, NULL, NULL));
979 g = string_fmt_append(g, "Berkeley DB: %s\n", DB_VERSION_STRING);
981 #elif defined(BTREEVERSION) && defined(HASHVERSION)
983 g = string_cat(g, US"Probably Berkeley DB version 1.8x (native mode)\n");
985 g = string_cat(g, US"Probably Berkeley DB version 1.8x (compatibility mode)\n");
988 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
989 g = string_cat(g, US"Probably ndbm\n");
990 #elif defined(USE_TDB)
991 g = string_cat(g, US"Using tdb\n");
994 g = string_cat(g, US"Probably GDBM (native mode)\n");
996 g = string_cat(g, US"Probably GDBM (compatibility mode)\n");
1003 /* This function is called for -bV/--version and for -d to output the optional
1004 features of the current Exim binary.
1006 Arguments: BOOL, true for stdout else debug channel
1011 show_whats_supported(BOOL is_stdout)
1013 rmark reset_point = store_mark();
1016 DEBUG(D_any) {} else g = show_db_version(g);
1018 g = string_cat(g, US"Support for:");
1019 #ifdef SUPPORT_CRYPTEQ
1020 g = string_cat(g, US" crypteq");
1023 g = string_cat(g, US" iconv()");
1026 g = string_cat(g, US" IPv6");
1028 #ifdef HAVE_SETCLASSRESOURCES
1029 g = string_cat(g, US" use_setclassresources");
1032 g = string_cat(g, US" PAM");
1035 g = string_cat(g, US" Perl");
1037 #ifdef EXPAND_DLFUNC
1038 g = string_cat(g, US" Expand_dlfunc");
1040 #ifdef USE_TCP_WRAPPERS
1041 g = string_cat(g, US" TCPwrappers");
1044 g = string_cat(g, US" GnuTLS");
1047 g = string_cat(g, US" OpenSSL");
1049 #ifndef DISABLE_TLS_RESUME
1050 g = string_cat(g, US" TLS_resume");
1052 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
1053 g = string_cat(g, US" translate_ip_address");
1055 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
1056 g = string_cat(g, US" move_frozen_messages");
1058 #ifdef WITH_CONTENT_SCAN
1059 g = string_cat(g, US" Content_Scanning");
1062 g = string_cat(g, US" DANE");
1064 #ifndef DISABLE_DKIM
1065 g = string_cat(g, US" DKIM");
1067 #ifdef SUPPORT_DMARC
1068 g = string_cat(g, US" DMARC");
1070 #ifndef DISABLE_DNSSEC
1071 g = string_cat(g, US" DNSSEC");
1073 #ifndef DISABLE_EVENT
1074 g = string_cat(g, US" Event");
1077 g = string_cat(g, US" I18N");
1079 #ifndef DISABLE_OCSP
1080 g = string_cat(g, US" OCSP");
1082 #ifndef DISABLE_PIPE_CONNECT
1083 g = string_cat(g, US" PIPECONNECT");
1085 #ifndef DISABLE_PRDR
1086 g = string_cat(g, US" PRDR");
1088 #ifdef SUPPORT_PROXY
1089 g = string_cat(g, US" PROXY");
1091 #ifndef DISABLE_QUEUE_RAMP
1092 g = string_cat(g, US" Queue_Ramp");
1094 #ifdef SUPPORT_SOCKS
1095 g = string_cat(g, US" SOCKS");
1098 g = string_cat(g, US" SPF");
1100 #if defined(SUPPORT_SRS)
1101 g = string_cat(g, US" SRS");
1105 if (f.tcp_fastopen_ok) g = string_cat(g, US" TCP_Fast_Open");
1107 #ifdef EXPERIMENTAL_ARC
1108 g = string_cat(g, US" Experimental_ARC");
1110 #ifdef EXPERIMENTAL_BRIGHTMAIL
1111 g = string_cat(g, US" Experimental_Brightmail");
1113 #ifdef EXPERIMENTAL_DCC
1114 g = string_cat(g, US" Experimental_DCC");
1116 #ifdef EXPERIMENTAL_DSN_INFO
1117 g = string_cat(g, US" Experimental_DSN_info");
1119 #ifdef EXPERIMENTAL_ESMTP_LIMITS
1120 g = string_cat(g, US" Experimental_ESMTP_Limits");
1122 #ifdef EXPERIMENTAL_QUEUEFILE
1123 g = string_cat(g, US" Experimental_QUEUEFILE");
1125 g = string_cat(g, US"\n");
1127 g = string_cat(g, US"Lookups (built-in):");
1128 #if defined(LOOKUP_LSEARCH) && LOOKUP_LSEARCH!=2
1129 g = string_cat(g, US" lsearch wildlsearch nwildlsearch iplsearch");
1131 #if defined(LOOKUP_CDB) && LOOKUP_CDB!=2
1132 g = string_cat(g, US" cdb");
1134 #if defined(LOOKUP_DBM) && LOOKUP_DBM!=2
1135 g = string_cat(g, US" dbm dbmjz dbmnz");
1137 #if defined(LOOKUP_DNSDB) && LOOKUP_DNSDB!=2
1138 g = string_cat(g, US" dnsdb");
1140 #if defined(LOOKUP_DSEARCH) && LOOKUP_DSEARCH!=2
1141 g = string_cat(g, US" dsearch");
1143 #if defined(LOOKUP_IBASE) && LOOKUP_IBASE!=2
1144 g = string_cat(g, US" ibase");
1146 #if defined(LOOKUP_JSON) && LOOKUP_JSON!=2
1147 g = string_cat(g, US" json");
1149 #if defined(LOOKUP_LDAP) && LOOKUP_LDAP!=2
1150 g = string_cat(g, US" ldap ldapdn ldapm");
1153 g = string_cat(g, US" lmdb");
1155 #if defined(LOOKUP_MYSQL) && LOOKUP_MYSQL!=2
1156 g = string_cat(g, US" mysql");
1158 #if defined(LOOKUP_NIS) && LOOKUP_NIS!=2
1159 g = string_cat(g, US" nis nis0");
1161 #if defined(LOOKUP_NISPLUS) && LOOKUP_NISPLUS!=2
1162 g = string_cat(g, US" nisplus");
1164 #if defined(LOOKUP_ORACLE) && LOOKUP_ORACLE!=2
1165 g = string_cat(g, US" oracle");
1167 #if defined(LOOKUP_PASSWD) && LOOKUP_PASSWD!=2
1168 g = string_cat(g, US" passwd");
1170 #if defined(LOOKUP_PGSQL) && LOOKUP_PGSQL!=2
1171 g = string_cat(g, US" pgsql");
1173 #if defined(LOOKUP_REDIS) && LOOKUP_REDIS!=2
1174 g = string_cat(g, US" redis");
1176 #if defined(LOOKUP_SQLITE) && LOOKUP_SQLITE!=2
1177 g = string_cat(g, US" sqlite");
1179 #if defined(LOOKUP_TESTDB) && LOOKUP_TESTDB!=2
1180 g = string_cat(g, US" testdb");
1182 #if defined(LOOKUP_WHOSON) && LOOKUP_WHOSON!=2
1183 g = string_cat(g, US" whoson");
1185 g = string_cat(g, US"\n");
1187 g = auth_show_supported(g);
1188 g = route_show_supported(g);
1189 g = transport_show_supported(g);
1191 #ifdef WITH_CONTENT_SCAN
1192 g = malware_show_supported(g);
1194 show_string(is_stdout, g); g = NULL;
1196 if (fixed_never_users[0] > 0)
1199 g = string_cat(g, US"Fixed never_users: ");
1200 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1201 string_fmt_append(g, "%u:", (unsigned)fixed_never_users[i]);
1202 g = string_fmt_append(g, "%u\n", (unsigned)fixed_never_users[i]);
1205 g = string_fmt_append(g, "Configure owner: %d:%d\n", config_uid, config_gid);
1207 g = string_fmt_append(g, "Size of off_t: " SIZE_T_FMT "\n", sizeof(off_t));
1209 /* Everything else is details which are only worth reporting when debugging.
1210 Perhaps the tls_version_report should move into this too. */
1214 /* clang defines __GNUC__ (at least, for me) so test for it first */
1215 #if defined(__clang__)
1216 g = string_fmt_append(g, "Compiler: CLang [%s]\n", __clang_version__);
1217 #elif defined(__GNUC__)
1218 g = string_fmt_append(g, "Compiler: GCC [%s]\n",
1222 "? unknown version ?"
1226 g = string_cat(g, US"Compiler: <unknown>\n");
1229 #if defined(__GLIBC__) && !defined(__UCLIBC__)
1230 g = string_fmt_append(g, "Library version: Glibc: Compile: %d.%d\n",
1231 __GLIBC__, __GLIBC_MINOR__);
1232 if (__GLIBC_PREREQ(2, 1))
1233 g = string_fmt_append(g, " Runtime: %s\n",
1234 gnu_get_libc_version());
1237 g = show_db_version(g);
1240 g = tls_version_report(g);
1243 g = utf8_version_report(g);
1245 #ifdef SUPPORT_DMARC
1246 g = dmarc_version_report(g);
1249 g = spf_lib_version_report(g);
1252 show_string(is_stdout, g);
1255 for (auth_info * authi = auths_available; *authi->driver_name != '\0'; ++authi)
1256 if (authi->version_report)
1257 g = (*authi->version_report)(g);
1259 /* PCRE_PRERELEASE is either defined and empty or a bare sequence of
1260 characters; unless it's an ancient version of PCRE in which case it
1262 #ifndef PCRE_PRERELEASE
1263 # define PCRE_PRERELEASE
1266 #define EXPAND_AND_QUOTE(X) QUOTE(X)
1269 pcre2_config(PCRE2_CONFIG_VERSION, buf);
1270 g = string_fmt_append(g, "Library version: PCRE2: Compile: %d.%d%s\n"
1272 PCRE2_MAJOR, PCRE2_MINOR,
1273 EXPAND_AND_QUOTE(PCRE2_PRERELEASE) "",
1277 #undef EXPAND_AND_QUOTE
1279 show_string(is_stdout, g);
1283 for (int i = 0; i < lookup_list_count; i++)
1284 if (lookup_list[i]->version_report)
1285 g = lookup_list[i]->version_report(g);
1286 show_string(is_stdout, g);
1289 #ifdef WHITELIST_D_MACROS
1290 g = string_fmt_append(g, "WHITELIST_D_MACROS: \"%s\"\n", WHITELIST_D_MACROS);
1292 g = string_cat(g, US"WHITELIST_D_MACROS unset\n");
1294 #ifdef TRUSTED_CONFIG_LIST
1295 g = string_fmt_append(g, "TRUSTED_CONFIG_LIST: \"%s\"\n", TRUSTED_CONFIG_LIST);
1297 g = string_cat(g, US"TRUSTED_CONFIG_LIST unset\n");
1301 show_string(is_stdout, g);
1302 store_reset(reset_point);
1306 /*************************************************
1307 * Show auxiliary information about Exim *
1308 *************************************************/
1311 show_exim_information(enum commandline_info request, FILE *stream)
1316 fprintf(stream, "Oops, something went wrong.\n");
1320 "The -bI: flag takes a string indicating which information to provide.\n"
1321 "If the string is not recognised, you'll get this help (on stderr).\n"
1323 " exim -bI:help this information\n"
1324 " exim -bI:dscp list of known dscp value keywords\n"
1325 " exim -bI:sieve list of supported sieve extensions\n"
1329 for (const uschar ** pp = exim_sieve_extension_list; *pp; ++pp)
1330 fprintf(stream, "%s\n", *pp);
1333 dscp_list_to_stream(stream);
1339 /*************************************************
1340 * Quote a local part *
1341 *************************************************/
1343 /* This function is used when a sender address or a From: or Sender: header
1344 line is being created from the caller's login, or from an authenticated_id. It
1345 applies appropriate quoting rules for a local part.
1347 Argument: the local part
1348 Returns: the local part, quoted if necessary
1352 local_part_quote(uschar *lpart)
1354 BOOL needs_quote = FALSE;
1357 for (uschar * t = lpart; !needs_quote && *t != 0; t++)
1359 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1360 (*t != '.' || t == lpart || t[1] == 0);
1363 if (!needs_quote) return lpart;
1365 g = string_catn(NULL, US"\"", 1);
1369 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1372 g = string_cat(g, lpart);
1375 g = string_catn(g, lpart, nq - lpart);
1376 g = string_catn(g, US"\\", 1);
1377 g = string_catn(g, nq, 1);
1381 g = string_catn(g, US"\"", 1);
1382 return string_from_gstring(g);
1388 /*************************************************
1389 * Load readline() functions *
1390 *************************************************/
1392 /* This function is called from testing executions that read data from stdin,
1393 but only when running as the calling user. Currently, only -be does this. The
1394 function loads the readline() function library and passes back the functions.
1395 On some systems, it needs the curses library, so load that too, but try without
1396 it if loading fails. All this functionality has to be requested at build time.
1399 fn_readline_ptr pointer to where to put the readline pointer
1400 fn_addhist_ptr pointer to where to put the addhistory function
1402 Returns: the dlopen handle or NULL on failure
1406 set_readline(char * (**fn_readline_ptr)(const char *),
1407 void (**fn_addhist_ptr)(const char *))
1410 void *dlhandle_curses = dlopen("libcurses." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_LAZY);
1412 dlhandle = dlopen("libreadline." DYNLIB_FN_EXT, RTLD_GLOBAL|RTLD_NOW);
1413 if (dlhandle_curses) dlclose(dlhandle_curses);
1417 /* Checked manual pages; at least in GNU Readline 6.1, the prototypes are:
1418 * char * readline (const char *prompt);
1419 * void add_history (const char *string);
1421 *fn_readline_ptr = (char *(*)(const char*))dlsym(dlhandle, "readline");
1422 *fn_addhist_ptr = (void(*)(const char*))dlsym(dlhandle, "add_history");
1425 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1433 /*************************************************
1434 * Get a line from stdin for testing things *
1435 *************************************************/
1437 /* This function is called when running tests that can take a number of lines
1438 of input (for example, -be and -bt). It handles continuations and trailing
1439 spaces. And prompting and a blank line output on eof. If readline() is in use,
1440 the arguments are non-NULL and provide the relevant functions.
1443 fn_readline readline function or NULL
1444 fn_addhist addhist function or NULL
1446 Returns: pointer to dynamic memory, or NULL at end of file
1450 get_stdinput(char *(*fn_readline)(const char *), void(*fn_addhist)(const char *))
1453 BOOL had_input = FALSE;
1455 if (!fn_readline) { printf("> "); fflush(stdout); }
1457 for (int i = 0;; i++)
1459 uschar buffer[1024];
1463 char *readline_line = NULL;
1466 if (!(readline_line = fn_readline((i > 0)? "":"> "))) break;
1467 if (*readline_line && fn_addhist) fn_addhist(readline_line);
1468 p = US readline_line;
1473 /* readline() not in use */
1476 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break; /*EOF*/
1480 /* Handle the line */
1483 ss = p + Ustrlen(p);
1484 while (ss > p && isspace(ss[-1])) ss--; /* strip trailing newline (and spaces) */
1487 while (p < ss && isspace(*p)) p++; /* strip leading space after cont */
1489 g = string_catn(g, p, ss - p);
1492 if (fn_readline) free(readline_line);
1495 /* g can only be NULL if ss==p */
1496 if (ss == p || g->s[g->ptr-1] != '\\') /* not continuation; done */
1499 --g->ptr; /* drop the \ */
1502 if (had_input) return g ? string_from_gstring(g) : US"";
1509 /*************************************************
1510 * Output usage information for the program *
1511 *************************************************/
1513 /* This function is called when there are no recipients
1514 or a specific --help argument was added.
1517 progname information on what name we were called by
1519 Returns: DOES NOT RETURN
1523 exim_usage(uschar *progname)
1526 /* Handle specific program invocation variants */
1527 if (Ustrcmp(progname, US"-mailq") == 0)
1529 "mailq - list the contents of the mail queue\n\n"
1530 "For a list of options, see the Exim documentation.\n");
1532 /* Generic usage - we output this whatever happens */
1534 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1535 "not directly from a shell command line. Options and/or arguments control\n"
1536 "what it does when called. For a list of options, see the Exim documentation.\n");
1541 /*************************************************
1542 * Validate that the macros given are okay *
1543 *************************************************/
1545 /* Typically, Exim will drop privileges if macros are supplied. In some
1546 cases, we want to not do so.
1548 Arguments: opt_D_used - true if the commandline had a "-D" option
1549 Returns: true if trusted, false otherwise
1553 macros_trusted(BOOL opt_D_used)
1555 #ifdef WHITELIST_D_MACROS
1556 uschar *whitelisted, *end, *p, **whites;
1557 int white_count, i, n;
1559 BOOL prev_char_item, found;
1564 #ifndef WHITELIST_D_MACROS
1568 /* We only trust -D overrides for some invoking users:
1569 root, the exim run-time user, the optional config owner user.
1570 I don't know why config-owner would be needed, but since they can own the
1571 config files anyway, there's no security risk to letting them override -D. */
1572 if ( ! ((real_uid == root_uid)
1573 || (real_uid == exim_uid)
1574 #ifdef CONFIGURE_OWNER
1575 || (real_uid == config_uid)
1579 debug_printf("macros_trusted rejecting macros for uid %d\n", (int) real_uid);
1583 /* Get a list of macros which are whitelisted */
1584 whitelisted = string_copy_perm(US WHITELIST_D_MACROS, FALSE);
1585 prev_char_item = FALSE;
1587 for (p = whitelisted; *p != '\0'; ++p)
1589 if (*p == ':' || isspace(*p))
1594 prev_char_item = FALSE;
1597 if (!prev_char_item)
1598 prev_char_item = TRUE;
1605 whites = store_malloc(sizeof(uschar *) * (white_count+1));
1606 for (p = whitelisted, i = 0; (p != end) && (i < white_count); ++p)
1611 if (i == white_count)
1613 while (*p != '\0' && p < end)
1619 /* The list of commandline macros should be very short.
1620 Accept the N*M complexity. */
1621 for (macro_item * m = macros_user; m; m = m->next) if (m->command_line)
1624 for (uschar ** w = whites; *w; ++w)
1625 if (Ustrcmp(*w, m->name) == 0)
1632 if (!m->replacement)
1634 if ((len = m->replen) == 0)
1636 if (!regex_match(regex_whitelisted_macro, m->replacement, len, NULL))
1639 DEBUG(D_any) debug_printf("macros_trusted overridden to true by whitelisting\n");
1645 /*************************************************
1646 * Expansion testing *
1647 *************************************************/
1649 /* Expand and print one item, doing macro-processing.
1652 item line for expansion
1656 expansion_test_line(const uschar * line)
1662 Ustrncpy(big_buffer, line, big_buffer_size);
1663 big_buffer[big_buffer_size-1] = '\0';
1664 len = Ustrlen(big_buffer);
1666 (void) macros_expand(0, &len, &dummy_macexp);
1668 if (isupper(big_buffer[0]))
1670 if (macro_read_assignment(big_buffer))
1671 printf("Defined macro '%s'\n", mlast->name);
1673 else if (Ustrncmp(big_buffer, "set ", 4) == 0)
1674 printf("%s\n", acl_standalone_setvar(big_buffer+4));
1676 if ((s = expand_string(big_buffer))) printf("%s\n", CS s);
1677 else printf("Failed: %s\n", expand_string_message);
1682 /*************************************************
1683 * Entry point and high-level code *
1684 *************************************************/
1686 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1687 the appropriate action. All the necessary functions are present in the one
1688 binary. I originally thought one should split it up, but it turns out that so
1689 much of the apparatus is needed in each chunk that one might as well just have
1690 it all available all the time, which then makes the coding easier as well.
1693 argc count of entries in argv
1694 argv argument strings, with argv[0] being the program name
1696 Returns: EXIT_SUCCESS if terminated successfully
1697 EXIT_FAILURE otherwise, except when a message has been sent
1698 to the sender, and -oee was given
1702 main(int argc, char **cargv)
1704 uschar **argv = USS cargv;
1705 int arg_receive_timeout = -1;
1706 int arg_smtp_receive_timeout = -1;
1707 int arg_error_handling = error_handling;
1708 int filter_sfd = -1;
1709 int filter_ufd = -1;
1712 int list_queue_option = 0;
1714 int msg_action_arg = -1;
1715 int namelen = argv[0] ? Ustrlen(argv[0]) : 0;
1716 int queue_only_reason = 0;
1718 int perl_start_option = 0;
1720 int recipients_arg = argc;
1721 int sender_address_domain = 0;
1722 int test_retry_arg = -1;
1723 int test_rewrite_arg = -1;
1724 gid_t original_egid;
1725 BOOL arg_queue_only = FALSE;
1726 BOOL bi_option = FALSE;
1727 BOOL checking = FALSE;
1728 BOOL count_queue = FALSE;
1729 BOOL expansion_test = FALSE;
1730 BOOL extract_recipients = FALSE;
1731 BOOL flag_G = FALSE;
1732 BOOL flag_n = FALSE;
1733 BOOL forced_delivery = FALSE;
1734 BOOL f_end_dot = FALSE;
1735 BOOL deliver_give_up = FALSE;
1736 BOOL list_queue = FALSE;
1737 BOOL list_options = FALSE;
1738 BOOL list_config = FALSE;
1739 BOOL local_queue_only;
1740 BOOL one_msg_action = FALSE;
1741 BOOL opt_D_used = FALSE;
1742 BOOL queue_only_set = FALSE;
1743 BOOL receiving_message = TRUE;
1744 BOOL sender_ident_set = FALSE;
1745 BOOL session_local_queue_only;
1747 BOOL removed_privilege = FALSE;
1748 BOOL usage_wanted = FALSE;
1749 BOOL verify_address_mode = FALSE;
1750 BOOL verify_as_sender = FALSE;
1751 BOOL rcpt_verify_quota = FALSE;
1752 BOOL version_printed = FALSE;
1753 uschar *alias_arg = NULL;
1754 uschar *called_as = US"";
1755 uschar *cmdline_syslog_name = NULL;
1756 uschar *start_queue_run_id = NULL;
1757 uschar *stop_queue_run_id = NULL;
1758 uschar *expansion_test_message = NULL;
1759 const uschar *ftest_domain = NULL;
1760 const uschar *ftest_localpart = NULL;
1761 const uschar *ftest_prefix = NULL;
1762 const uschar *ftest_suffix = NULL;
1763 uschar *log_oneline = NULL;
1764 uschar *malware_test_file = NULL;
1765 uschar *real_sender_address;
1766 uschar *originator_home = US"/";
1770 struct stat statbuf;
1771 pid_t passed_qr_pid = (pid_t)0;
1772 int passed_qr_pipe = -1;
1773 gid_t group_list[EXIM_GROUPLIST_SIZE];
1775 /* For the -bI: flag */
1776 enum commandline_info info_flag = CMDINFO_NONE;
1777 BOOL info_stdout = FALSE;
1779 /* Possible options for -R and -S */
1781 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1783 /* Need to define this in case we need to change the environment in order
1784 to get rid of a bogus time zone. We have to make it char rather than uschar
1785 because some OS define it in /usr/include/unistd.h. */
1787 extern char **environ;
1789 #ifdef MEASURE_TIMING
1790 (void)gettimeofday(×tamp_startup, NULL);
1793 store_init(); /* Initialise the memory allocation susbsystem */
1794 pcre_init(); /* Set up memory handling for pcre */
1796 /* If the Exim user and/or group and/or the configuration file owner/group were
1797 defined by ref:name at build time, we must now find the actual uid/gid values.
1798 This is a feature to make the lives of binary distributors easier. */
1800 #ifdef EXIM_USERNAME
1801 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1804 exim_fail("exim: refusing to run with uid 0 for \"%s\"\n", EXIM_USERNAME);
1806 /* If ref:name uses a number as the name, route_finduser() returns
1807 TRUE with exim_uid set and pw coerced to NULL. */
1809 exim_gid = pw->pw_gid;
1810 #ifndef EXIM_GROUPNAME
1813 "exim: ref:name should specify a usercode, not a group.\n"
1814 "exim: can't let you get away with it unless you also specify a group.\n");
1818 exim_fail("exim: failed to find uid for user name \"%s\"\n", EXIM_USERNAME);
1821 #ifdef EXIM_GROUPNAME
1822 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1823 exim_fail("exim: failed to find gid for group name \"%s\"\n", EXIM_GROUPNAME);
1826 #ifdef CONFIGURE_OWNERNAME
1827 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1828 exim_fail("exim: failed to find uid for user name \"%s\"\n",
1829 CONFIGURE_OWNERNAME);
1832 /* We default the system_filter_user to be the Exim run-time user, as a
1833 sane non-root value. */
1834 system_filter_uid = exim_uid;
1836 #ifdef CONFIGURE_GROUPNAME
1837 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1838 exim_fail("exim: failed to find gid for group name \"%s\"\n",
1839 CONFIGURE_GROUPNAME);
1842 /* In the Cygwin environment, some initialization used to need doing.
1843 It was fudged in by means of this macro; now no longer but we'll leave
1844 it in case of others. */
1850 /* Check a field which is patched when we are running Exim within its
1851 testing harness; do a fast initial check, and then the whole thing. */
1853 f.running_in_test_harness =
1854 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1855 if (f.running_in_test_harness)
1858 /* Protect against abusive argv[0] */
1859 if (!argv[0] || !argc) exim_fail("exim: executable name required\n");
1860 exim_str_fail_toolong(argv[0], PATH_MAX, "argv[0]");
1862 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1863 at the start of a program; however, it seems that some environments do not
1864 follow this. A "strange" locale can affect the formatting of timestamps, so we
1867 setlocale(LC_ALL, "C");
1869 /* Get the offset between CLOCK_MONOTONIC/CLOCK_BOOTTIME and wallclock */
1871 #ifdef _POSIX_MONOTONIC_CLOCK
1875 /* Set up the default handler for timing using alarm(). */
1877 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1879 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1880 because store_malloc writes a log entry on failure. */
1882 if (!(log_buffer = US malloc(LOG_BUFFER_SIZE)))
1883 exim_fail("exim: failed to get store for log buffer\n");
1885 /* Initialize the default log options. */
1887 bits_set(log_selector, log_selector_size, log_default);
1889 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1890 NULL when the daemon is run and the file is closed. We have to use this
1891 indirection, because some systems don't allow writing to the variable "stderr".
1894 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1896 /* Ensure there is a big buffer for temporary use in several places. It is put
1897 in malloc store so that it can be freed for enlargement if necessary. */
1899 big_buffer = store_malloc(big_buffer_size);
1901 /* Set up the handler for the data request signal, and set the initial
1902 descriptive text. */
1904 process_info = store_get(PROCESS_INFO_SIZE, GET_TAINTED);
1905 set_process_info("initializing");
1906 os_restarting_signal(SIGUSR1, usr1_handler); /* exiwhat */
1909 struct sigaction act = { .sa_sigaction = segv_handler, .sa_flags = SA_RESETHAND | SA_SIGINFO };
1910 sigaction(SIGSEGV, &act, NULL);
1913 signal(SIGSEGV, segv_handler); /* log faults */
1916 /* If running in a dockerized environment, the TERM signal is only
1917 delegated to the PID 1 if we request it by setting an signal handler */
1918 if (getpid() == 1) signal(SIGTERM, term_handler);
1920 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1921 in the daemon code. For the rest of Exim's uses, we ignore it. */
1923 signal(SIGHUP, SIG_IGN);
1925 /* We don't want to die on pipe errors as the code is written to handle
1926 the write error instead. */
1928 signal(SIGPIPE, SIG_IGN);
1930 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1931 set to SIG_IGN. This causes subprocesses that complete before the parent
1932 process waits for them not to hang around, so when Exim calls wait(), nothing
1933 is there. The wait() code has been made robust against this, but let's ensure
1934 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1935 ending status. We use sigaction rather than plain signal() on those OS where
1936 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1937 problem on AIX with this.) */
1941 struct sigaction act;
1942 act.sa_handler = SIG_DFL;
1943 sigemptyset(&(act.sa_mask));
1945 sigaction(SIGCHLD, &act, NULL);
1948 signal(SIGCHLD, SIG_DFL);
1951 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1956 /* Set up the version number. Set up the leading 'E' for the external form of
1957 message ids, set the pointer to the internal form, and initialize it to
1958 indicate no message being processed. */
1961 message_id_option[0] = '-';
1962 message_id_external = message_id_option + 1;
1963 message_id_external[0] = 'E';
1964 message_id = message_id_external + 1;
1967 /* Set the umask to zero so that any files Exim creates using open() are
1968 created with the modes that it specifies. NOTE: Files created with fopen() have
1969 a problem, which was not recognized till rather late (February 2006). With this
1970 umask, such files will be world writeable. (They are all content scanning files
1971 in the spool directory, which isn't world-accessible, so this is not a
1972 disaster, but it's untidy.) I don't want to change this overall setting,
1973 however, because it will interact badly with the open() calls. Instead, there's
1974 now a function called modefopen() that fiddles with the umask while calling
1979 /* Precompile the regular expression for matching a message id. Keep this in
1980 step with the code that generates ids in the accept.c module. We need to do
1981 this here, because the -M options check their arguments for syntactic validity
1982 using mac_ismsgid, which uses this. */
1985 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", MCS_NOFLAGS, TRUE);
1987 /* Precompile the regular expression that is used for matching an SMTP error
1988 code, possibly extended, at the start of an error message. Note that the
1989 terminating whitespace character is included. */
1992 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1995 #ifdef WHITELIST_D_MACROS
1996 /* Precompile the regular expression used to filter the content of macros
1997 given to -D for permissibility. */
1999 regex_whitelisted_macro =
2000 regex_must_compile(US"^[A-Za-z0-9_/.-]*$", MCS_NOFLAGS, TRUE);
2003 for (i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
2005 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
2006 this seems to be a generally accepted convention, since one finds symbolic
2007 links called "mailq" in standard OS configurations. */
2009 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
2010 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
2013 receiving_message = FALSE;
2014 called_as = US"-mailq";
2017 /* If the program is called as "rmail" treat it as equivalent to
2018 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
2019 i.e. preventing a single dot on a line from terminating the message, and
2020 returning with zero return code, even in cases of error (provided an error
2021 message has been sent). */
2023 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
2024 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
2027 called_as = US"-rmail";
2028 errors_sender_rc = EXIT_SUCCESS;
2031 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
2032 this is a smail convention. */
2034 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
2035 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
2037 smtp_input = smtp_batched_input = TRUE;
2038 called_as = US"-rsmtp";
2041 /* If the program is called as "runq" treat it as equivalent to "exim -q";
2042 this is a smail convention. */
2044 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
2045 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
2048 receiving_message = FALSE;
2049 called_as = US"-runq";
2052 /* If the program is called as "newaliases" treat it as equivalent to
2053 "exim -bi"; this is a sendmail convention. */
2055 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
2056 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
2059 receiving_message = FALSE;
2060 called_as = US"-newaliases";
2063 /* Save the original effective uid for a couple of uses later. It should
2064 normally be root, but in some esoteric environments it may not be. */
2066 original_euid = geteuid();
2067 original_egid = getegid();
2069 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
2070 to be the same as the real ones. This makes a difference only if Exim is setuid
2071 (or setgid) to something other than root, which could be the case in some
2072 special configurations. */
2074 real_uid = getuid();
2075 real_gid = getgid();
2077 if (real_uid == root_uid)
2079 if ((rv = setgid(real_gid)))
2080 exim_fail("exim: setgid(%ld) failed: %s\n",
2081 (long int)real_gid, strerror(errno));
2082 if ((rv = setuid(real_uid)))
2083 exim_fail("exim: setuid(%ld) failed: %s\n",
2084 (long int)real_uid, strerror(errno));
2087 /* If neither the original real uid nor the original euid was root, Exim is
2088 running in an unprivileged state. */
2090 unprivileged = (real_uid != root_uid && original_euid != root_uid);
2092 /* For most of the args-parsing we need to use permanent pool memory */
2094 int old_pool = store_pool;
2095 store_pool = POOL_PERM;
2097 /* Scan the program's arguments. Some can be dealt with right away; others are
2098 simply recorded for checking and handling afterwards. Do a high-level switch
2099 on the second character (the one after '-'), to save some effort. */
2101 for (i = 1; i < argc; i++)
2103 BOOL badarg = FALSE;
2104 uschar * arg = argv[i];
2108 /* An argument not starting with '-' is the start of a recipients list;
2109 break out of the options-scanning loop. */
2117 /* An option consisting of -- terminates the options */
2119 if (Ustrcmp(arg, "--") == 0)
2121 recipients_arg = i + 1;
2125 /* Handle flagged options */
2127 switchchar = arg[1];
2130 /* Make all -ex options synonymous with -oex arguments, since that
2131 is assumed by various callers. Also make -qR options synonymous with -R
2132 options, as that seems to be required as well. Allow for -qqR too, and
2133 the same for -S options. */
2135 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
2136 Ustrncmp(arg+1, "qR", 2) == 0 ||
2137 Ustrncmp(arg+1, "qS", 2) == 0)
2139 switchchar = arg[2];
2142 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
2144 switchchar = arg[3];
2146 f.queue_2stage = TRUE;
2149 /* Make -r synonymous with -f, since it is a documented alias */
2151 else if (arg[1] == 'r') switchchar = 'f';
2153 /* Make -ov synonymous with -v */
2155 else if (Ustrcmp(arg, "-ov") == 0)
2161 /* deal with --option_aliases */
2162 else if (switchchar == '-')
2164 if (Ustrcmp(argrest, "help") == 0)
2166 usage_wanted = TRUE;
2169 else if (Ustrcmp(argrest, "version") == 0)
2176 /* High-level switch on active initial letter */
2181 /* sendmail uses -Ac and -Am to control which .cf file is used;
2184 if (!*argrest) { badarg = TRUE; break; }
2187 BOOL ignore = FALSE;
2192 if (*(argrest + 1) == '\0')
2196 if (!ignore) badarg = TRUE;
2200 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
2201 so has no need of it. */
2204 if (!*argrest) i++; /* Skip over the type */
2210 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
2214 /* -bd: Run in daemon mode, awaiting SMTP connections.
2215 -bdf: Ditto, but in the foreground.
2218 f.daemon_listen = f.daemon_scion = TRUE;
2219 if (*argrest == 'f') f.background_daemon = FALSE;
2220 else if (*argrest) badarg = TRUE;
2223 /* -be: Run in expansion test mode
2224 -bem: Ditto, but read a message from a file first
2227 expansion_test = checking = TRUE;
2228 if (*argrest == 'm')
2230 if (++i >= argc) { badarg = TRUE; break; }
2231 expansion_test_message = argv[i];
2234 if (*argrest) badarg = TRUE;
2237 /* -bF: Run system filter test */
2239 filter_test |= checking = FTEST_SYSTEM;
2240 if (*argrest) badarg = TRUE;
2241 else if (++i < argc) filter_test_sfile = argv[i];
2242 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2245 /* -bf: Run user filter test
2246 -bfd: Set domain for filter testing
2247 -bfl: Set local part for filter testing
2248 -bfp: Set prefix for filter testing
2249 -bfs: Set suffix for filter testing
2254 filter_test |= checking = FTEST_USER;
2255 if (++i < argc) filter_test_ufile = argv[i];
2256 else exim_fail("exim: file name expected after %s\n", argv[i-1]);
2261 exim_fail("exim: string expected after %s\n", arg);
2262 if (Ustrcmp(argrest, "d") == 0) ftest_domain = exim_str_fail_toolong(argv[i], EXIM_DOMAINNAME_MAX, "-bfd");
2263 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfl");
2264 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfp");
2265 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = exim_str_fail_toolong(argv[i], EXIM_LOCALPART_MAX, "-bfs");
2270 /* -bh: Host checking - an IP address must follow. */
2272 if (!*argrest || Ustrcmp(argrest, "c") == 0)
2274 if (++i >= argc) { badarg = TRUE; break; }
2275 sender_host_address = string_copy_taint(
2276 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-bh"),
2278 host_checking = checking = f.log_testing_mode = TRUE;
2279 f.host_checking_callout = *argrest == 'c';
2280 message_logs = FALSE;
2285 /* -bi: This option is used by sendmail to initialize *the* alias file,
2286 though it has the -oA option to specify a different file. Exim has no
2287 concept of *the* alias file, but since Sun's YP make script calls
2288 sendmail this way, some support must be provided. */
2290 if (!*argrest) bi_option = TRUE;
2294 /* -bI: provide information, of the type to follow after a colon.
2295 This is an Exim flag. */
2297 if (Ustrlen(argrest) >= 1 && *argrest == ':')
2299 uschar *p = argrest+1;
2300 info_flag = CMDINFO_HELP;
2302 if (strcmpic(p, CUS"sieve") == 0)
2304 info_flag = CMDINFO_SIEVE;
2307 else if (strcmpic(p, CUS"dscp") == 0)
2309 info_flag = CMDINFO_DSCP;
2312 else if (strcmpic(p, CUS"help") == 0)
2318 /* -bm: Accept and deliver message - the default option. Reinstate
2319 receiving_message, which got turned off for all -b options.
2320 -bmalware: test the filename given for malware */
2322 if (!*argrest) receiving_message = TRUE;
2323 else if (Ustrcmp(argrest, "alware") == 0)
2325 if (++i >= argc) { badarg = TRUE; break; }
2327 malware_test_file = argv[i];
2332 /* -bnq: For locally originating messages, do not qualify unqualified
2333 addresses. In the envelope, this causes errors; in header lines they
2336 if (Ustrcmp(argrest, "q") == 0)
2338 f.allow_unqualified_sender = FALSE;
2339 f.allow_unqualified_recipient = FALSE;
2344 /* -bpxx: List the contents of the mail queue, in various forms. If
2345 the option is -bpc, just a queue count is needed. Otherwise, if the
2346 first letter after p is r, then order is random. */
2348 if (*argrest == 'c')
2351 if (*++argrest) badarg = TRUE;
2355 if (*argrest == 'r')
2357 list_queue_option = 8;
2360 else list_queue_option = 0;
2364 /* -bp: List the contents of the mail queue, top-level only */
2368 /* -bpu: List the contents of the mail queue, top-level undelivered */
2370 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
2372 /* -bpa: List the contents of the mail queue, including all delivered */
2374 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
2376 /* Unknown after -bp[r] */
2382 /* -bP: List the configuration variables given as the address list.
2383 Force -v, so configuration errors get displayed. */
2386 /* -bP config: we need to setup here, because later,
2387 when list_options is checked, the config is read already */
2390 else if (argv[i+1] && Ustrcmp(argv[i+1], "config") == 0)
2393 readconf_save_config(version_string);
2397 list_options = TRUE;
2398 debug_selector |= D_v;
2399 debug_file = stderr;
2403 /* -brt: Test retry configuration lookup */
2405 if (Ustrcmp(argrest, "t") == 0)
2408 test_retry_arg = i + 1;
2412 /* -brw: Test rewrite configuration */
2414 else if (Ustrcmp(argrest, "w") == 0)
2417 test_rewrite_arg = i + 1;
2423 /* -bS: Read SMTP commands on standard input, but produce no replies -
2424 all errors are reported by sending messages. */
2427 smtp_input = smtp_batched_input = receiving_message = TRUE;
2431 /* -bs: Read SMTP commands on standard input and produce SMTP replies
2432 on standard output. */
2434 if (!*argrest) smtp_input = receiving_message = TRUE;
2438 /* -bt: address testing mode */
2441 f.address_test_mode = checking = f.log_testing_mode = TRUE;
2445 /* -bv: verify addresses */
2448 verify_address_mode = checking = f.log_testing_mode = TRUE;
2450 /* -bvs: verify sender addresses */
2452 else if (Ustrcmp(argrest, "s") == 0)
2454 verify_address_mode = checking = f.log_testing_mode = TRUE;
2455 verify_as_sender = TRUE;
2460 /* -bV: Print version string and support details */
2464 printf("Exim version %s #%s built %s\n", version_string,
2465 version_cnumber, version_date);
2466 printf("%s\n", CS version_copyright);
2467 version_printed = TRUE;
2468 show_whats_supported(TRUE);
2469 f.log_testing_mode = TRUE;
2474 /* -bw: inetd wait mode, accept a listening socket as stdin */
2476 f.inetd_wait_mode = TRUE;
2477 f.background_daemon = FALSE;
2478 f.daemon_listen = f.daemon_scion = TRUE;
2480 if ((inetd_wait_timeout = readconf_readtime(argrest, 0, FALSE)) <= 0)
2481 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
2492 /* -C: change configuration file list; ignore if it isn't really
2493 a change! Enforce a prefix check if required. */
2497 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2498 if (Ustrcmp(config_main_filelist, argrest) != 0)
2500 #ifdef ALT_CONFIG_PREFIX
2502 int len = Ustrlen(ALT_CONFIG_PREFIX);
2503 const uschar *list = argrest;
2505 /* The argv is untainted, so big_buffer (also untainted) is ok to use */
2506 while((filename = string_nextinlist(&list, &sep, big_buffer,
2508 if ( ( Ustrlen(filename) < len
2509 || Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0
2510 || Ustrstr(filename, "/../") != NULL
2512 && (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid)
2514 exim_fail("-C Permission denied\n");
2516 if (real_uid != root_uid)
2518 #ifdef TRUSTED_CONFIG_LIST
2520 if (real_uid != exim_uid
2521 #ifdef CONFIGURE_OWNER
2522 && real_uid != config_uid
2525 f.trusted_config = FALSE;
2528 FILE *trust_list = Ufopen(TRUSTED_CONFIG_LIST, "rb");
2531 struct stat statbuf;
2533 if (fstat(fileno(trust_list), &statbuf) != 0 ||
2534 (statbuf.st_uid != root_uid /* owner not root */
2535 #ifdef CONFIGURE_OWNER
2536 && statbuf.st_uid != config_uid /* owner not the special one */
2539 (statbuf.st_gid != root_gid /* group not root */
2540 #ifdef CONFIGURE_GROUP
2541 && statbuf.st_gid != config_gid /* group not the special one */
2543 && (statbuf.st_mode & 020) != 0 /* group writeable */
2545 (statbuf.st_mode & 2) != 0) /* world writeable */
2547 f.trusted_config = FALSE;
2552 /* Well, the trust list at least is up to scratch... */
2554 uschar *trusted_configs[32];
2557 int old_pool = store_pool;
2558 store_pool = POOL_MAIN;
2560 reset_point = store_mark();
2561 while (Ufgets(big_buffer, big_buffer_size, trust_list))
2563 uschar *start = big_buffer, *nl;
2564 while (*start && isspace(*start))
2568 nl = Ustrchr(start, '\n');
2571 trusted_configs[nr_configs++] = string_copy(start);
2572 if (nr_configs == nelem(trusted_configs))
2580 const uschar *list = argrest;
2582 while (f.trusted_config && (filename = string_nextinlist(&list,
2583 &sep, big_buffer, big_buffer_size)))
2585 for (i=0; i < nr_configs; i++)
2586 if (Ustrcmp(filename, trusted_configs[i]) == 0)
2588 if (i == nr_configs)
2590 f.trusted_config = FALSE;
2595 else /* No valid prefixes found in trust_list file. */
2596 f.trusted_config = FALSE;
2597 store_reset(reset_point);
2598 store_pool = old_pool;
2601 else /* Could not open trust_list file. */
2602 f.trusted_config = FALSE;
2605 /* Not root; don't trust config */
2606 f.trusted_config = FALSE;
2610 config_main_filelist = argrest;
2611 f.config_changed = TRUE;
2616 /* -D: set up a macro definition */
2619 #ifdef DISABLE_D_OPTION
2620 exim_fail("exim: -D is not available in this Exim binary\n");
2626 uschar *s = argrest;
2629 while (isspace(*s)) s++;
2631 if (*s < 'A' || *s > 'Z')
2632 exim_fail("exim: macro name set by -D must start with "
2633 "an upper case letter\n");
2635 while (isalnum(*s) || *s == '_')
2637 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2641 if (ptr == 0) { badarg = TRUE; break; }
2642 while (isspace(*s)) s++;
2645 if (*s++ != '=') { badarg = TRUE; break; }
2646 while (isspace(*s)) s++;
2649 for (m = macros_user; m; m = m->next)
2650 if (Ustrcmp(m->name, name) == 0)
2651 exim_fail("exim: duplicated -D in command line\n");
2653 m = macro_create(name, s, TRUE);
2655 if (clmacro_count >= MAX_CLMACROS)
2656 exim_fail("exim: too many -D options on command line\n");
2657 clmacros[clmacro_count++] =
2658 string_sprintf("-D%s=%s", m->name, m->replacement);
2665 /* -dropcr: Set this option. Now a no-op, retained for compatibility only. */
2667 if (Ustrcmp(argrest, "ropcr") == 0)
2669 /* drop_cr = TRUE; */
2672 /* -dp: Set up a debug pretrigger buffer with given size. */
2674 else if (Ustrcmp(argrest, "p") == 0)
2678 debug_pretrigger_setup(argv[i]);
2680 /* -dt: Set a debug trigger selector */
2682 else if (Ustrncmp(argrest, "t=", 2) == 0)
2683 dtrigger_selector = (unsigned int) Ustrtol(argrest + 2, NULL, 0);
2685 /* -d: Set debug level (see also -v below).
2686 If -dd is used, debugging subprocesses of the daemon is disabled. */
2690 /* Use an intermediate variable so that we don't set debugging while
2691 decoding the debugging bits. */
2693 unsigned int selector = D_default;
2696 if (*argrest == 'd')
2698 f.debug_daemon = TRUE;
2702 decode_bits(&selector, 1, debug_notall, argrest,
2703 debug_options, debug_options_count, US"debug", 0);
2704 debug_selector = selector;
2709 /* -E: This is a local error message. This option is not intended for
2710 external use at all, but is not restricted to trusted callers because it
2711 does no harm (just suppresses certain error messages) and if Exim is run
2712 not setuid root it won't always be trusted when it generates error
2713 messages using this option. If there is a message id following -E, point
2714 message_reference at it, for logging. */
2717 f.local_error_message = TRUE;
2718 if (mac_ismsgid(argrest)) message_reference = argrest;
2722 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2723 option, so it looks as if historically the -oex options are also callable
2724 without the leading -o. So we have to accept them. Before the switch,
2725 anything starting -oe has been converted to -e. Exim does not support all
2726 of the sendmail error options. */
2729 if (Ustrcmp(argrest, "e") == 0)
2731 arg_error_handling = ERRORS_SENDER;
2732 errors_sender_rc = EXIT_SUCCESS;
2734 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2735 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2736 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2737 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2742 /* -F: Set sender's full name, used instead of the gecos entry from
2743 the password file. Since users can usually alter their gecos entries,
2744 there's no security involved in using this instead. The data can follow
2745 the -F or be in the next argument. */
2749 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2750 originator_name = string_copy_taint(
2751 exim_str_fail_toolong(argrest, EXIM_HUMANNAME_MAX, "-F"),
2753 f.sender_name_forced = TRUE;
2757 /* -f: Set sender's address - this value is only actually used if Exim is
2758 run by a trusted user, or if untrusted_set_sender is set and matches the
2759 address, except that the null address can always be set by any user. The
2760 test for this happens later, when the value given here is ignored when not
2761 permitted. For an untrusted user, the actual sender is still put in Sender:
2762 if it doesn't match the From: header (unless no_local_from_check is set).
2763 The data can follow the -f or be in the next argument. The -r switch is an
2764 obsolete form of -f but since there appear to be programs out there that
2765 use anything that sendmail has ever supported, better accept it - the
2766 synonymizing is done before the switch above.
2768 At this stage, we must allow domain literal addresses, because we don't
2769 know what the setting of allow_domain_literals is yet. Ditto for trailing
2770 dots and strip_trailing_dot. */
2774 int dummy_start, dummy_end;
2777 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
2778 (void) exim_str_fail_toolong(argrest, EXIM_DISPLAYMAIL_MAX, "-f");
2780 *(sender_address = store_get(1, GET_UNTAINTED)) = '\0'; /* Ensure writeable memory */
2783 uschar * temp = argrest + Ustrlen(argrest) - 1;
2784 while (temp >= argrest && isspace(*temp)) temp--;
2785 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2786 allow_domain_literals = TRUE;
2787 strip_trailing_dot = TRUE;
2789 allow_utf8_domains = TRUE;
2791 if (!(sender_address = parse_extract_address(argrest, &errmess,
2792 &dummy_start, &dummy_end, &sender_address_domain, TRUE)))
2793 exim_fail("exim: bad -f address \"%s\": %s\n", argrest, errmess);
2795 sender_address = string_copy_taint(sender_address, GET_TAINTED);
2797 message_smtputf8 = string_is_utf8(sender_address);
2798 allow_utf8_domains = FALSE;
2800 allow_domain_literals = FALSE;
2801 strip_trailing_dot = FALSE;
2803 f.sender_address_forced = TRUE;
2807 /* -G: sendmail invocation to specify that it's a gateway submission and
2808 sendmail may complain about problems instead of fixing them.
2809 We make it equivalent to an ACL "control = suppress_local_fixups" and do
2810 not at this time complain about problems. */
2816 /* -h: Set the hop count for an incoming message. Exim does not currently
2817 support this; it always computes it by counting the Received: headers.
2818 To put it in will require a change to the spool header file format. */
2822 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2823 if (!isdigit(*argrest)) badarg = TRUE;
2827 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2828 not to be documented for sendmail but mailx (at least) uses it) */
2831 if (!*argrest) f.dot_ends = FALSE; else badarg = TRUE;
2835 /* -L: set the identifier used for syslog; equivalent to setting
2836 syslog_processname in the config file, but needs to be an admin option. */
2840 if (++i < argc) argrest = argv[i]; else { badarg = TRUE; break; }
2841 if ((sz = Ustrlen(argrest)) > 32)
2842 exim_fail("exim: the -L syslog name is too long: \"%s\"\n", argrest);
2844 exim_fail("exim: the -L syslog name is too short\n");
2845 cmdline_syslog_name = string_copy_taint(argrest, GET_TAINTED);
2849 receiving_message = FALSE;
2851 /* -MC: continue delivery of another message via an existing open
2852 file descriptor. This option is used for an internal call by the
2853 smtp transport when there is a pending message waiting to go to an
2854 address to which it has got a connection. Five subsequent arguments are
2855 required: transport name, host name, IP address, sequence number, and
2856 message_id. Transports may decline to create new processes if the sequence
2857 number gets too big. The channel is stdin. This (-MC) must be the last
2858 argument. There's a subsequent check that the real-uid is privileged.
2860 If we are running in the test harness. delay for a bit, to let the process
2861 that set this one up complete. This makes for repeatability of the logging,
2864 if (Ustrcmp(argrest, "C") == 0)
2866 union sockaddr_46 interface_sock;
2867 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2870 exim_fail("exim: too many or too few arguments after -MC\n");
2872 if (msg_action_arg >= 0)
2873 exim_fail("exim: incompatible arguments\n");
2875 continue_transport = string_copy_taint(
2876 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-C internal transport"),
2878 continue_hostname = string_copy_taint(
2879 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-C internal hostname"),
2881 continue_host_address = string_copy_taint(
2882 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-C internal hostaddr"),
2884 continue_sequence = Uatoi(argv[++i]);
2885 msg_action = MSG_DELIVER;
2886 msg_action_arg = ++i;
2887 forced_delivery = TRUE;
2888 queue_run_pid = passed_qr_pid;
2889 queue_run_pipe = passed_qr_pipe;
2891 if (!mac_ismsgid(argv[i]))
2892 exim_fail("exim: malformed message id %s after -MC option\n",
2895 /* Set up $sending_ip_address and $sending_port, unless proxied */
2897 if (!continue_proxy_cipher)
2898 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2900 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2903 exim_fail("exim: getsockname() failed after -MC option: %s\n",
2906 testharness_pause_ms(500);
2910 else if (*argrest == 'C' && argrest[1] && !argrest[2])
2914 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2915 precedes -MC (see above). The flag indicates that the host to which
2916 Exim is connected has accepted an AUTH sequence. */
2918 case 'A': f.smtp_authenticated = TRUE; break;
2920 /* -MCD: set the smtp_use_dsn flag; this indicates that the host
2921 that exim is connected to supports the esmtp extension DSN */
2923 case 'D': smtp_peer_options |= OPTION_DSN; break;
2925 /* -MCd: for debug, set a process-purpose string */
2927 case 'd': if (++i < argc)
2928 process_purpose = string_copy_taint(
2929 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCd"),
2934 /* -MCG: set the queue name, to a non-default value. Arguably, anything
2935 from the commandline should be tainted - but we will need an untainted
2936 value for the spoolfile when doing a -odi delivery process. */
2938 case 'G': if (++i < argc) queue_name = string_copy_taint(
2939 exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-MCG"),
2944 /* -MCK: the peer offered CHUNKING. Must precede -MC */
2946 case 'K': smtp_peer_options |= OPTION_CHUNKING; break;
2948 #ifdef EXPERIMENTAL_ESMTP_LIMITS
2949 /* -MCL: peer used LIMITS RCPTMAX and/or RCPTDOMAINMAX */
2950 case 'L': if (++i < argc) continue_limit_mail = Uatoi(argv[i]);
2952 if (++i < argc) continue_limit_rcpt = Uatoi(argv[i]);
2954 if (++i < argc) continue_limit_rcptdom = Uatoi(argv[i]);
2959 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2960 it preceded -MC (see above) */
2962 case 'P': smtp_peer_options |= OPTION_PIPE; break;
2964 #ifdef SUPPORT_SOCKS
2965 /* -MCp: Socks proxy in use; nearside IP, port, external IP, port */
2966 case 'p': proxy_session = TRUE;
2969 proxy_local_address = string_copy_taint(argv[i], GET_TAINTED);
2972 proxy_local_port = Uatoi(argv[i]);
2975 proxy_external_address = string_copy_taint(argv[i], GET_TAINTED);
2978 proxy_external_port = Uatoi(argv[i]);
2984 /* -MCQ: pass on the pid of the queue-running process that started
2985 this chain of deliveries and the fd of its synchronizing pipe; this
2986 is useful only when it precedes -MC (see above) */
2988 case 'Q': if (++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2990 if (++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2994 /* -MCq: do a quota check on the given recipient for the given size
2995 of message. Separate from -MC. */
2996 case 'q': rcpt_verify_quota = TRUE;
2997 if (++i < argc) message_size = Uatoi(argv[i]);
3001 /* -MCS: set the smtp_use_size flag; this is useful only when it
3002 precedes -MC (see above) */
3004 case 'S': smtp_peer_options |= OPTION_SIZE; break;
3007 /* -MCs: used with -MCt; SNI was sent */
3008 /* -MCr: ditto, DANE */
3011 case 's': if (++i < argc)
3013 continue_proxy_sni = string_copy_taint(
3014 exim_str_fail_toolong(argv[i], EXIM_HOSTNAME_MAX, "-MCr/-MCs"),
3016 if (argrest[1] == 'r') continue_proxy_dane = TRUE;
3021 /* -MCt: similar to -MCT below but the connection is still open
3022 via a proxy process which handles the TLS context and coding.
3023 Require three arguments for the proxied local address and port,
3024 and the TLS cipher. */
3026 case 't': if (++i < argc)
3027 sending_ip_address = string_copy_taint(
3028 exim_str_fail_toolong(argv[i], EXIM_IPADDR_MAX, "-MCt IP"),
3032 sending_port = (int)(Uatol(argv[i]));
3035 continue_proxy_cipher = string_copy_taint(
3036 exim_str_fail_toolong(argv[i], EXIM_CIPHERNAME_MAX, "-MCt cipher"),
3041 /* -MCT: set the tls_offered flag; this is useful only when it
3042 precedes -MC (see above). The flag indicates that the host to which
3043 Exim is connected has offered TLS support. */
3045 case 'T': smtp_peer_options |= OPTION_TLS; break;
3048 default: badarg = TRUE; break;
3053 /* -M[x]: various operations on the following list of message ids:
3054 -M deliver the messages, ignoring next retry times and thawing
3055 -Mc deliver the messages, checking next retry times, no thawing
3056 -Mf freeze the messages
3057 -Mg give up on the messages
3058 -Mt thaw the messages
3059 -Mrm remove the messages
3060 In the above cases, this must be the last option. There are also the
3061 following options which are followed by a single message id, and which
3062 act on that message. Some of them use the "recipient" addresses as well.
3063 -Mar add recipient(s)
3064 -MG move to a different queue
3065 -Mmad mark all recipients delivered
3066 -Mmd mark recipients(s) delivered
3068 -Mset load a message for use with -be
3070 -Mvc show copy (of whole message, in RFC 2822 format)
3077 msg_action = MSG_DELIVER;
3078 forced_delivery = f.deliver_force_thaw = TRUE;
3080 else if (Ustrcmp(argrest, "ar") == 0)
3082 msg_action = MSG_ADD_RECIPIENT;
3083 one_msg_action = TRUE;
3085 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
3086 else if (Ustrcmp(argrest, "es") == 0)
3088 msg_action = MSG_EDIT_SENDER;
3089 one_msg_action = TRUE;
3091 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
3092 else if (Ustrcmp(argrest, "g") == 0)
3094 msg_action = MSG_DELIVER;
3095 deliver_give_up = TRUE;
3097 else if (Ustrcmp(argrest, "G") == 0)
3099 msg_action = MSG_SETQUEUE;
3100 queue_name_dest = string_copy_taint(
3101 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-MG"),
3104 else if (Ustrcmp(argrest, "mad") == 0) msg_action = MSG_MARK_ALL_DELIVERED;
3105 else if (Ustrcmp(argrest, "md") == 0)
3107 msg_action = MSG_MARK_DELIVERED;
3108 one_msg_action = TRUE;
3110 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
3111 else if (Ustrcmp(argrest, "set") == 0)
3113 msg_action = MSG_LOAD;
3114 one_msg_action = TRUE;
3116 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
3117 else if (Ustrcmp(argrest, "vb") == 0)
3119 msg_action = MSG_SHOW_BODY;
3120 one_msg_action = TRUE;
3122 else if (Ustrcmp(argrest, "vc") == 0)
3124 msg_action = MSG_SHOW_COPY;
3125 one_msg_action = TRUE;
3127 else if (Ustrcmp(argrest, "vh") == 0)
3129 msg_action = MSG_SHOW_HEADER;
3130 one_msg_action = TRUE;
3132 else if (Ustrcmp(argrest, "vl") == 0)
3134 msg_action = MSG_SHOW_LOG;
3135 one_msg_action = TRUE;
3137 else { badarg = TRUE; break; }
3139 /* All the -Mxx options require at least one message id. */
3141 msg_action_arg = i + 1;
3142 if (msg_action_arg >= argc)
3143 exim_fail("exim: no message ids given after %s option\n", arg);
3145 /* Some require only message ids to follow */
3147 if (!one_msg_action)
3149 for (int j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
3150 exim_fail("exim: malformed message id %s after %s option\n",
3152 goto END_ARG; /* Remaining args are ids */
3155 /* Others require only one message id, possibly followed by addresses,
3156 which will be handled as normal arguments. */
3160 if (!mac_ismsgid(argv[msg_action_arg]))
3161 exim_fail("exim: malformed message id %s after %s option\n",
3162 argv[msg_action_arg], arg);
3168 /* Some programs seem to call the -om option without the leading o;
3169 for sendmail it askes for "me too". Exim always does this. */
3172 if (*argrest) badarg = TRUE;
3176 /* -N: don't do delivery - a debugging option that stops transports doing
3177 their thing. It implies debugging at the D_v level. */
3182 f.dont_deliver = TRUE;
3183 debug_selector |= D_v;
3184 debug_file = stderr;
3190 /* -n: This means "don't alias" in sendmail, apparently.
3191 For normal invocations, it has no effect.
3192 It may affect some other options. */
3198 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
3199 option to the specified value. This form uses long names. We need to handle
3200 -O option=value and -Ooption=value. */
3205 exim_fail("exim: string expected after -O\n");
3211 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
3214 if (!*(alias_arg = argrest))
3215 if (i+1 < argc) alias_arg = argv[++i];
3216 else exim_fail("exim: string expected after -oA\n");
3219 /* -oB: Set a connection message max value for remote deliveries */
3222 uschar * p = argrest;
3224 if (i+1 < argc && isdigit((argv[i+1][0])))
3228 connection_max_messages = 1;
3235 exim_fail("exim: number expected after -oB\n");
3236 connection_max_messages = Uatoi(p);
3241 /* -odb: background delivery */
3244 if (Ustrcmp(argrest, "b") == 0)
3246 f.synchronous_delivery = FALSE;
3247 arg_queue_only = FALSE;
3248 queue_only_set = TRUE;
3251 /* -odd: testsuite-only: add no inter-process delays */
3253 else if (Ustrcmp(argrest, "d") == 0)
3254 f.testsuite_delays = FALSE;
3256 /* -odf: foreground delivery (smail-compatible option); same effect as
3257 -odi: interactive (synchronous) delivery (sendmail-compatible option)
3260 else if (Ustrcmp(argrest, "f") == 0 || Ustrcmp(argrest, "i") == 0)
3262 f.synchronous_delivery = TRUE;
3263 arg_queue_only = FALSE;
3264 queue_only_set = TRUE;
3267 /* -odq: queue only */
3269 else if (Ustrcmp(argrest, "q") == 0)
3271 f.synchronous_delivery = FALSE;
3272 arg_queue_only = TRUE;
3273 queue_only_set = TRUE;
3276 /* -odqs: queue SMTP only - do local deliveries and remote routing,
3277 but no remote delivery */
3279 else if (Ustrcmp(argrest, "qs") == 0)
3281 f.queue_smtp = TRUE;
3282 arg_queue_only = FALSE;
3283 queue_only_set = TRUE;
3288 /* -oex: Sendmail error flags. As these are also accepted without the
3289 leading -o prefix, for compatibility with vacation and other callers,
3290 they are handled with -e above. */
3292 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
3293 -oitrue: Another sendmail syntax for the same */
3296 if (!*argrest || Ustrcmp(argrest, "true") == 0)
3301 /* -oM*: Set various characteristics for an incoming message; actually
3302 acted on for trusted callers only. */
3307 exim_fail("exim: data expected after -oM%s\n", argrest);
3309 /* -oMa: Set sender host address */
3311 if (Ustrcmp(argrest, "a") == 0)
3312 sender_host_address = string_copy_taint(
3313 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMa"),
3316 /* -oMaa: Set authenticator name */
3318 else if (Ustrcmp(argrest, "aa") == 0)
3319 sender_host_authenticated = string_copy_taint(
3320 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMaa"),
3323 /* -oMas: setting authenticated sender */
3325 else if (Ustrcmp(argrest, "as") == 0)
3326 authenticated_sender = string_copy_taint(
3327 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3330 /* -oMai: setting authenticated id */
3332 else if (Ustrcmp(argrest, "ai") == 0)
3333 authenticated_id = string_copy_taint(
3334 exim_str_fail_toolong(argv[++i], EXIM_EMAILADDR_MAX, "-oMas"),
3337 /* -oMi: Set incoming interface address */
3339 else if (Ustrcmp(argrest, "i") == 0)
3340 interface_address = string_copy_taint(
3341 exim_str_fail_toolong(argv[++i], EXIM_IPADDR_MAX, "-oMi"),
3344 /* -oMm: Message reference */
3346 else if (Ustrcmp(argrest, "m") == 0)
3348 if (!mac_ismsgid(argv[i+1]))
3349 exim_fail("-oMm must be a valid message ID\n");
3350 if (!f.trusted_config)
3351 exim_fail("-oMm must be called by a trusted user/config\n");
3352 message_reference = argv[++i];
3355 /* -oMr: Received protocol */
3357 else if (Ustrcmp(argrest, "r") == 0)
3359 if (received_protocol)
3360 exim_fail("received_protocol is set already\n");
3362 received_protocol = string_copy_taint(
3363 exim_str_fail_toolong(argv[++i], EXIM_DRIVERNAME_MAX, "-oMr"),
3366 /* -oMs: Set sender host name */
3368 else if (Ustrcmp(argrest, "s") == 0)
3369 sender_host_name = string_copy_taint(
3370 exim_str_fail_toolong(argv[++i], EXIM_HOSTNAME_MAX, "-oMs"),
3373 /* -oMt: Set sender ident */
3375 else if (Ustrcmp(argrest, "t") == 0)
3377 sender_ident_set = TRUE;
3378 sender_ident = string_copy_taint(
3379 exim_str_fail_toolong(argv[++i], EXIM_IDENTUSER_MAX, "-oMt"),
3383 /* Else a bad argument */
3390 /* -om: Me-too flag for aliases. Exim always does this. Some programs
3391 seem to call this as -m (undocumented), so that is also accepted (see
3393 /* -oo: An ancient flag for old-style addresses which still seems to
3394 crop up in some calls (see in SCO). */
3398 if (*argrest) badarg = TRUE;
3401 /* -oP <name>: set pid file path for daemon
3402 -oPX: delete pid file of daemon */
3405 if (!f.running_in_test_harness && real_uid != root_uid && real_uid != exim_uid)
3406 exim_fail("exim: only uid=%d or uid=%d can use -oP and -oPX "
3407 "(uid=%d euid=%d | %d)\n",
3408 root_uid, exim_uid, getuid(), geteuid(), real_uid);
3409 if (!*argrest) override_pid_file_path = argv[++i];
3410 else if (Ustrcmp(argrest, "X") == 0) delete_pid_file();
3415 /* -or <n>: set timeout for non-SMTP acceptance
3416 -os <n>: set timeout for SMTP acceptance */
3421 int * tp = argrest[-1] == 'r'
3422 ? &arg_receive_timeout : &arg_smtp_receive_timeout;
3424 *tp = readconf_readtime(argrest, 0, FALSE);
3425 else if (i+1 < argc)
3426 *tp = readconf_readtime(argv[++i], 0, FALSE);
3429 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3433 /* -oX <list>: Override local_interfaces and/or default daemon ports */
3434 /* Limits: Is there a real limit we want here? 1024 is very arbitrary. */
3437 if (*argrest) badarg = TRUE;
3438 else override_local_interfaces = string_copy_taint(
3439 exim_str_fail_toolong(argv[++i], 1024, "-oX"),
3443 /* -oY: Override creation of daemon notifier socket */
3446 if (*argrest) badarg = TRUE;
3447 else notifier_socket = NULL;
3450 /* Unknown -o argument */
3458 /* -ps: force Perl startup; -pd force delayed Perl startup */
3462 if (*argrest == 's' && argrest[1] == 0)
3464 perl_start_option = 1;
3467 if (*argrest == 'd' && argrest[1] == 0)
3469 perl_start_option = -1;
3474 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
3475 which sets the host protocol and host name */
3478 if (i+1 < argc) argrest = argv[++i]; else { badarg = TRUE; break; }
3482 uschar * hn = Ustrchr(argrest, ':');
3484 if (received_protocol)
3485 exim_fail("received_protocol is set already\n");
3488 received_protocol = string_copy_taint(
3489 exim_str_fail_toolong(argrest, EXIM_DRIVERNAME_MAX, "-p<protocol>"),
3493 (void) exim_str_fail_toolong(argrest, (EXIM_DRIVERNAME_MAX+1+EXIM_HOSTNAME_MAX), "-p<protocol>:<host>");
3494 received_protocol = string_copyn_taint(argrest, hn - argrest, GET_TAINTED);
3495 sender_host_name = string_copy_taint(hn + 1, GET_TAINTED);
3502 receiving_message = FALSE;
3503 if (queue_interval >= 0)
3504 exim_fail("exim: -q specified more than once\n");
3506 /* -qq...: Do queue runs in a 2-stage manner */
3508 if (*argrest == 'q')
3510 f.queue_2stage = TRUE;
3514 /* -qi...: Do only first (initial) deliveries */
3516 if (*argrest == 'i')
3518 f.queue_run_first_delivery = TRUE;
3522 /* -qf...: Run the queue, forcing deliveries
3523 -qff..: Ditto, forcing thawing as well */
3525 if (*argrest == 'f')
3527 f.queue_run_force = TRUE;
3528 if (*++argrest == 'f')
3530 f.deliver_force_thaw = TRUE;
3535 /* -q[f][f]l...: Run the queue only on local deliveries */
3537 if (*argrest == 'l')
3539 f.queue_run_local = TRUE;
3543 /* -q[f][f][l][G<name>]... Work on the named queue */
3545 if (*argrest == 'G')
3548 for (argrest++, i = 0; argrest[i] && argrest[i] != '/'; ) i++;
3549 exim_len_fail_toolong(i, EXIM_DRIVERNAME_MAX, "-q*G<name>");
3550 queue_name = string_copyn(argrest, i);
3552 if (*argrest == '/') argrest++;
3555 /* -q[f][f][l][G<name>]: Run the queue, optionally forced, optionally local
3556 only, optionally named, optionally starting from a given message id. */
3558 if (!(list_queue || count_queue))
3560 && (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
3563 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3564 start_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3565 if (i+1 < argc && mac_ismsgid(argv[i+1]))
3566 stop_queue_run_id = string_copy_taint(argv[++i], GET_TAINTED);
3569 /* -q[f][f][l][G<name>/]<n>: Run the queue at regular intervals, optionally
3570 forced, optionally local only, optionally named. */
3572 else if ((queue_interval = readconf_readtime(*argrest ? argrest : argv[++i],
3574 exim_fail("exim: bad time value %s: abandoned\n", argv[i]);
3578 case 'R': /* Synonymous with -qR... */
3580 const uschar *tainted_selectstr;
3582 receiving_message = FALSE;
3584 /* -Rf: As -R (below) but force all deliveries,
3585 -Rff: Ditto, but also thaw all frozen messages,
3586 -Rr: String is regex
3587 -Rrf: Regex and force
3588 -Rrff: Regex and force and thaw
3590 in all cases provided there are no further characters in this
3594 for (int i = 0; i < nelem(rsopts); i++)
3595 if (Ustrcmp(argrest, rsopts[i]) == 0)
3597 if (i != 2) f.queue_run_force = TRUE;
3598 if (i >= 2) f.deliver_selectstring_regex = TRUE;
3599 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3600 argrest += Ustrlen(rsopts[i]);
3603 /* -R: Set string to match in addresses for forced queue run to
3604 pick out particular messages. */
3606 /* Avoid attacks from people providing very long strings, and do so before
3609 tainted_selectstr = argrest;
3610 else if (i+1 < argc)
3611 tainted_selectstr = argv[++i];
3613 exim_fail("exim: string expected after -R\n");
3614 deliver_selectstring = string_copy_taint(
3615 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-R"),
3620 /* -r: an obsolete synonym for -f (see above) */
3623 /* -S: Like -R but works on sender. */
3625 case 'S': /* Synonymous with -qS... */
3627 const uschar *tainted_selectstr;
3629 receiving_message = FALSE;
3631 /* -Sf: As -S (below) but force all deliveries,
3632 -Sff: Ditto, but also thaw all frozen messages,
3633 -Sr: String is regex
3634 -Srf: Regex and force
3635 -Srff: Regex and force and thaw
3637 in all cases provided there are no further characters in this
3641 for (int i = 0; i < nelem(rsopts); i++)
3642 if (Ustrcmp(argrest, rsopts[i]) == 0)
3644 if (i != 2) f.queue_run_force = TRUE;
3645 if (i >= 2) f.deliver_selectstring_sender_regex = TRUE;
3646 if (i == 1 || i == 4) f.deliver_force_thaw = TRUE;
3647 argrest += Ustrlen(rsopts[i]);
3650 /* -S: Set string to match in addresses for forced queue run to
3651 pick out particular messages. */
3654 tainted_selectstr = argrest;
3655 else if (i+1 < argc)
3656 tainted_selectstr = argv[++i];
3658 exim_fail("exim: string expected after -S\n");
3659 deliver_selectstring_sender = string_copy_taint(
3660 exim_str_fail_toolong(tainted_selectstr, EXIM_EMAILADDR_MAX, "-S"),
3665 /* -Tqt is an option that is exclusively for use by the testing suite.
3666 It is not recognized in other circumstances. It allows for the setting up
3667 of explicit "queue times" so that various warning/retry things can be
3668 tested. Otherwise variability of clock ticks etc. cause problems. */
3671 if (f.running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
3672 fudged_queue_times = string_copy_taint(argv[++i], GET_TAINTED);
3677 /* -t: Set flag to extract recipients from body of message. */
3680 if (!*argrest) extract_recipients = TRUE;
3682 /* -ti: Set flag to extract recipients from body of message, and also
3683 specify that dot does not end the message. */
3685 else if (Ustrcmp(argrest, "i") == 0)
3687 extract_recipients = TRUE;
3691 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
3694 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_in.on_connect = TRUE;
3701 /* -U: This means "initial user submission" in sendmail, apparently. The
3702 doc claims that in future sendmail may refuse syntactically invalid
3703 messages instead of fixing them. For the moment, we just ignore it. */
3709 /* -v: verify things - this is a very low-level debugging */
3714 debug_selector |= D_v;
3715 debug_file = stderr;
3721 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
3723 The -x flag tells the sendmail command that mail from a local
3724 mail program has National Language Support (NLS) extended characters
3725 in the body of the mail item. The sendmail command can send mail with
3726 extended NLS characters across networks that normally corrupts these
3729 As Exim is 8-bit clean, it just ignores this flag. */
3732 if (*argrest) badarg = TRUE;
3735 /* -X: in sendmail: takes one parameter, logfile, and sends debugging
3736 logs to that file. We swallow the parameter and otherwise ignore it. */
3741 exim_fail("exim: string expected after -X\n");
3744 /* -z: a line of text to log */
3749 log_oneline = string_copy_taint(
3750 exim_str_fail_toolong(argv[i], 2048, "-z logtext"),
3753 exim_fail("exim: file name expected after %s\n", argv[i-1]);
3756 /* All other initial characters are errors */
3761 } /* End of high-level switch statement */
3763 /* Failed to recognize the option, or syntax error */
3766 exim_fail("exim abandoned: unknown, malformed, or incomplete "
3767 "option %s\n", arg);
3771 /* If -R or -S have been specified without -q, assume a single queue run. */
3773 if ( (deliver_selectstring || deliver_selectstring_sender)
3774 && queue_interval < 0)
3779 store_pool = old_pool;
3782 /* If usage_wanted is set we call the usage function - which never returns */
3783 if (usage_wanted) exim_usage(called_as);
3785 /* Arguments have been processed. Check for incompatibilities. */
3786 if ( ( (smtp_input || extract_recipients || recipients_arg < argc)
3787 && ( f.daemon_listen || queue_interval >= 0 || bi_option
3788 || test_retry_arg >= 0 || test_rewrite_arg >= 0
3789 || filter_test != FTEST_NONE
3790 || msg_action_arg > 0 && !one_msg_action
3792 || ( msg_action_arg > 0
3793 && ( f.daemon_listen || queue_interval > 0 || list_options
3794 || checking && msg_action != MSG_LOAD
3795 || bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0
3797 || ( (f.daemon_listen || queue_interval > 0)
3798 && ( sender_address || list_options || list_queue || checking
3801 || f.daemon_listen && queue_interval == 0
3802 || f.inetd_wait_mode && queue_interval >= 0
3804 && ( checking || smtp_input || extract_recipients
3805 || filter_test != FTEST_NONE || bi_option
3807 || ( verify_address_mode
3808 && ( f.address_test_mode || smtp_input || extract_recipients
3809 || filter_test != FTEST_NONE || bi_option
3811 || ( f.address_test_mode
3812 && ( smtp_input || extract_recipients || filter_test != FTEST_NONE
3816 && (sender_address || filter_test != FTEST_NONE || extract_recipients)
3818 || deliver_selectstring && queue_interval < 0
3819 || msg_action == MSG_LOAD && (!expansion_test || expansion_test_message)
3821 exim_fail("exim: incompatible command-line options or arguments\n");
3823 /* If debugging is set up, set the file and the file descriptor to pass on to
3824 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3825 to run in the foreground. */
3827 if (debug_selector != 0)
3829 debug_file = stderr;
3830 debug_fd = fileno(debug_file);
3831 f.background_daemon = FALSE;
3832 testharness_pause_ms(100); /* lets caller finish */
3833 if (debug_selector != D_v) /* -v only doesn't show this */
3835 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3836 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3838 if (!version_printed)
3839 show_whats_supported(FALSE);
3843 /* When started with root privilege, ensure that the limits on the number of
3844 open files and the number of processes (where that is accessible) are
3845 sufficiently large, or are unset, in case Exim has been called from an
3846 environment where the limits are screwed down. Not all OS have the ability to
3847 change some of these limits. */
3851 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3857 #ifdef RLIMIT_NOFILE
3858 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3860 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3862 rlp.rlim_cur = rlp.rlim_max = 0;
3865 /* I originally chose 1000 as a nice big number that was unlikely to
3866 be exceeded. It turns out that some older OS have a fixed upper limit of
3869 if (rlp.rlim_cur < 1000)
3871 rlp.rlim_cur = rlp.rlim_max = 1000;
3872 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3874 rlp.rlim_cur = rlp.rlim_max = 256;
3875 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3876 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3883 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3885 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3887 rlp.rlim_cur = rlp.rlim_max = 0;
3890 # ifdef RLIM_INFINITY
3891 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3893 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3895 if (rlp.rlim_cur < 1000)
3897 rlp.rlim_cur = rlp.rlim_max = 1000;
3899 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3900 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3906 /* Exim is normally entered as root (but some special configurations are
3907 possible that don't do this). However, it always spins off sub-processes that
3908 set their uid and gid as required for local delivery. We don't want to pass on
3909 any extra groups that root may belong to, so we want to get rid of them all at
3912 We need to obey setgroups() at this stage, before possibly giving up root
3913 privilege for a changed configuration file, but later on we might need to
3914 check on the additional groups for the admin user privilege - can't do that
3915 till after reading the config, which might specify the exim gid. Therefore,
3916 save the group list here first. */
3918 if ((group_count = getgroups(nelem(group_list), group_list)) < 0)
3919 exim_fail("exim: getgroups() failed: %s\n", strerror(errno));
3921 /* There is a fundamental difference in some BSD systems in the matter of
3922 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3923 known not to be different. On the "different" systems there is a single group
3924 list, and the first entry in it is the current group. On all other versions of
3925 Unix there is a supplementary group list, which is in *addition* to the current
3926 group. Consequently, to get rid of all extraneous groups on a "standard" system
3927 you pass over 0 groups to setgroups(), while on a "different" system you pass
3928 over a single group - the current group, which is always the first group in the
3929 list. Calling setgroups() with zero groups on a "different" system results in
3930 an error return. The following code should cope with both types of system.
3932 Unfortunately, recent MacOS, which should be a FreeBSD, "helpfully" succeeds
3933 the "setgroups() with zero groups" - and changes the egid.
3934 Thanks to that we had to stash the original_egid above, for use below
3935 in the call to exim_setugid().
3937 However, if this process isn't running as root, setgroups() can't be used
3938 since you have to be root to run it, even if throwing away groups.
3939 Except, sigh, for Hurd - where you can.
3940 Not being root here happens only in some unusual configurations. */
3943 #ifndef OS_SETGROUPS_ZERO_DROPS_ALL
3944 && setgroups(0, NULL) != 0
3946 && setgroups(1, group_list) != 0)
3947 exim_fail("exim: setgroups() failed: %s\n", strerror(errno));
3949 /* If the configuration file name has been altered by an argument on the
3950 command line (either a new file name or a macro definition) and the caller is
3951 not root, or if this is a filter testing run, remove any setuid privilege the
3952 program has and run as the underlying user.
3954 The exim user is locked out of this, which severely restricts the use of -C
3957 Otherwise, set the real ids to the effective values (should be root unless run
3958 from inetd, which it can either be root or the exim uid, if one is configured).
3960 There is a private mechanism for bypassing some of this, in order to make it
3961 possible to test lots of configurations automatically, without having either to
3962 recompile each time, or to patch in an actual configuration file name and other
3963 values (such as the path name). If running in the test harness, pretend that
3964 configuration file changes and macro definitions haven't happened. */
3967 (!f.trusted_config || /* Config changed, or */
3968 !macros_trusted(opt_D_used)) && /* impermissible macros and */
3969 real_uid != root_uid && /* Not root, and */
3970 !f.running_in_test_harness /* Not fudged */
3972 expansion_test /* expansion testing */
3974 filter_test != FTEST_NONE) /* Filter testing */
3976 setgroups(group_count, group_list);
3977 exim_setugid(real_uid, real_gid, FALSE,
3978 US"-C, -D, -be or -bf forces real uid");
3979 removed_privilege = TRUE;
3981 /* In the normal case when Exim is called like this, stderr is available
3982 and should be used for any logging information because attempts to write
3983 to the log will usually fail. To arrange this, we unset really_exim. However,
3984 if no stderr is available there is no point - we might as well have a go
3985 at the log (if it fails, syslog will be written).
3987 Note that if the invoker is Exim, the logs remain available. Messing with
3988 this causes unlogged successful deliveries. */
3990 if (log_stderr && real_uid != exim_uid)
3991 f.really_exim = FALSE;
3994 /* Privilege is to be retained for the moment. It may be dropped later,
3995 depending on the job that this Exim process has been asked to do. For now, set
3996 the real uid to the effective so that subsequent re-execs of Exim are done by a
4000 exim_setugid(geteuid(), original_egid, FALSE, US"forcing real = effective");
4002 /* If testing a filter, open the file(s) now, before wasting time doing other
4003 setups and reading the message. */
4005 if (filter_test & FTEST_SYSTEM)
4006 if ((filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0)) < 0)
4007 exim_fail("exim: failed to open %s: %s\n", filter_test_sfile,
4010 if (filter_test & FTEST_USER)
4011 if ((filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0)) < 0)
4012 exim_fail("exim: failed to open %s: %s\n", filter_test_ufile,
4015 /* Initialise lookup_list
4016 If debugging, already called above via version reporting.
4017 In either case, we initialise the list of available lookups while running
4018 as root. All dynamically modules are loaded from a directory which is
4019 hard-coded into the binary and is code which, if not a module, would be
4020 part of Exim already. Ability to modify the content of the directory
4021 is equivalent to the ability to modify a setuid binary!
4023 This needs to happen before we read the main configuration. */
4026 /*XXX this excrescence could move to the testsuite standard config setup file */
4028 if (f.running_in_test_harness) smtputf8_advertise_hosts = NULL;
4031 /* Read the main runtime configuration data; this gives up if there
4032 is a failure. It leaves the configuration file open so that the subsequent
4033 configuration data for delivery can be read if needed.
4035 NOTE: immediately after opening the configuration file we change the working
4036 directory to "/"! Later we change to $spool_directory. We do it there, because
4037 during readconf_main() some expansion takes place already. */
4039 /* Store the initial cwd before we change directories. Can be NULL if the
4040 dir has already been unlinked. */
4041 initial_cwd = os_getcwd(NULL, 0);
4042 if (!initial_cwd && errno)
4043 exim_fail("exim: getting initial cwd failed: %s\n", strerror(errno));
4045 if (initial_cwd && (strlen(CCS initial_cwd) >= BIG_BUFFER_SIZE))
4046 exim_fail("exim: initial cwd is far too long (%d)\n", Ustrlen(CCS initial_cwd));
4049 -be[m] expansion test -
4050 -b[fF] filter test new
4052 -bmalware malware_test_file new
4054 -brw rewrite test new
4056 -bv[s] address verify -
4058 -bP <option> (except -bP config, which sets list_config)
4060 If any of these options is set, we suppress warnings about configuration
4061 issues (currently about tls_advertise_hosts and keep_environment not being
4065 int old_pool = store_pool;
4066 #ifdef MEASURE_TIMING
4068 (void)gettimeofday(&t0, NULL);
4071 store_pool = POOL_CONFIG;
4072 readconf_main(checking || list_options);
4073 store_pool = old_pool;
4075 #ifdef MEASURE_TIMING
4076 report_time_since(&t0, US"readconf_main (delta)");
4080 /* Now in directory "/" */
4082 if (cleanup_environment() == FALSE)
4083 log_write(0, LOG_PANIC_DIE, "Can't cleanup environment");
4086 /* If an action on specific messages is requested, or if a daemon or queue
4087 runner is being started, we need to know if Exim was called by an admin user.
4088 This is the case if the real user is root or exim, or if the real group is
4089 exim, or if one of the supplementary groups is exim or a group listed in
4090 admin_groups. We don't fail all message actions immediately if not admin_user,
4091 since some actions can be performed by non-admin users. Instead, set admin_user
4092 for later interrogation. */
4094 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
4095 f.admin_user = TRUE;
4097 for (int i = 0; i < group_count && !f.admin_user; i++)
4098 if (group_list[i] == exim_gid)
4099 f.admin_user = TRUE;
4100 else if (admin_groups)
4101 for (int j = 1; j <= (int)admin_groups[0] && !f.admin_user; j++)
4102 if (admin_groups[j] == group_list[i])
4103 f.admin_user = TRUE;
4105 /* Another group of privileged users are the trusted users. These are root,
4106 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
4107 are permitted to specify sender_addresses with -f on the command line, and
4108 other message parameters as well. */
4110 if (real_uid == root_uid || real_uid == exim_uid)
4111 f.trusted_caller = TRUE;
4115 for (int i = 1; i <= (int)trusted_users[0] && !f.trusted_caller; i++)
4116 if (trusted_users[i] == real_uid)
4117 f.trusted_caller = TRUE;
4120 for (int i = 1; i <= (int)trusted_groups[0] && !f.trusted_caller; i++)
4121 if (trusted_groups[i] == real_gid)
4122 f.trusted_caller = TRUE;
4123 else for (int j = 0; j < group_count && !f.trusted_caller; j++)
4124 if (trusted_groups[i] == group_list[j])
4125 f.trusted_caller = TRUE;
4128 /* At this point, we know if the user is privileged and some command-line
4129 options become possibly impermissible, depending upon the configuration file. */
4131 if (checking && commandline_checks_require_admin && !f.admin_user)
4132 exim_fail("exim: those command-line flags are set to require admin\n");
4134 /* Handle the decoding of logging options. */
4136 decode_bits(log_selector, log_selector_size, log_notall,
4137 log_selector_string, log_options, log_options_count, US"log", 0);
4141 debug_printf("configuration file is %s\n", config_main_filename);
4142 debug_printf("log selectors =");
4143 for (int i = 0; i < log_selector_size; i++)
4144 debug_printf(" %08x", log_selector[i]);
4148 /* If domain literals are not allowed, check the sender address that was
4149 supplied with -f. Ditto for a stripped trailing dot. */
4153 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
4154 exim_fail("exim: bad -f address \"%s\": domain literals not "
4155 "allowed\n", sender_address);
4156 if (f_end_dot && !strip_trailing_dot)
4157 exim_fail("exim: bad -f address \"%s.\": domain is malformed "
4158 "(trailing dot not allowed)\n", sender_address);
4161 /* See if an admin user overrode our logging. */
4163 if (cmdline_syslog_name)
4166 syslog_processname = cmdline_syslog_name;
4167 log_file_path = string_copy(CUS"syslog");
4170 /* not a panic, non-privileged users should not be able to spam paniclog */
4172 "exim: you lack sufficient privilege to specify syslog process name\n");
4174 /* Paranoia check of maximum lengths of certain strings. There is a check
4175 on the length of the log file path in log.c, which will come into effect
4176 if there are any calls to write the log earlier than this. However, if we
4177 get this far but the string is very long, it is better to stop now than to
4178 carry on and (e.g.) receive a message and then have to collapse. The call to
4179 log_write() from here will cause the ultimate panic collapse if the complete
4180 file name exceeds the buffer length. */
4182 if (Ustrlen(log_file_path) > 200)
4183 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4184 "log_file_path is longer than 200 chars: aborting");
4186 if (Ustrlen(pid_file_path) > 200)
4187 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4188 "pid_file_path is longer than 200 chars: aborting");
4190 if (Ustrlen(spool_directory) > 200)
4191 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4192 "spool_directory is longer than 200 chars: aborting");
4194 /* Length check on the process name given to syslog for its TAG field,
4195 which is only permitted to be 32 characters or less. See RFC 3164. */
4197 if (Ustrlen(syslog_processname) > 32)
4198 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
4199 "syslog_processname is longer than 32 chars: aborting");
4204 log_write(0, LOG_MAIN, "%s", log_oneline);
4205 return EXIT_SUCCESS;
4208 return EXIT_FAILURE;
4210 /* In some operating systems, the environment variable TMPDIR controls where
4211 temporary files are created; Exim doesn't use these (apart from when delivering
4212 to MBX mailboxes), but called libraries such as DBM libraries may require them.
4213 If TMPDIR is found in the environment, reset it to the value defined in the
4214 EXIM_TMPDIR macro, if this macro is defined. For backward compatibility this
4215 macro may be called TMPDIR in old "Local/Makefile"s. It's converted to
4216 EXIM_TMPDIR by the build scripts.
4220 if (environ) for (uschar ** p = USS environ; *p; p++)
4221 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 && Ustrcmp(*p+7, EXIM_TMPDIR) != 0)
4223 uschar * newp = store_malloc(Ustrlen(EXIM_TMPDIR) + 8);
4224 sprintf(CS newp, "TMPDIR=%s", EXIM_TMPDIR);
4226 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", EXIM_TMPDIR);
4230 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
4231 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
4232 we may need to get rid of a bogus timezone setting. This can arise when Exim is
4233 called by a user who has set the TZ variable. This then affects the timestamps
4234 in log files and in Received: headers, and any created Date: header lines. The
4235 required timezone is settable in the configuration file, so nothing can be done
4236 about this earlier - but hopefully nothing will normally be logged earlier than
4237 this. We have to make a new environment if TZ is wrong, but don't bother if
4238 timestamps_utc is set, because then all times are in UTC anyway. */
4240 if (timezone_string && strcmpic(timezone_string, US"UTC") == 0)
4241 f.timestamps_utc = TRUE;
4244 uschar *envtz = US getenv("TZ");
4246 ? !timezone_string || Ustrcmp(timezone_string, envtz) != 0
4247 : timezone_string != NULL
4250 uschar **p = USS environ;
4254 if (environ) while (*p++) count++;
4255 if (!envtz) count++;
4256 newp = new = store_malloc(sizeof(uschar *) * (count + 1));
4257 if (environ) for (p = USS environ; *p; p++)
4258 if (Ustrncmp(*p, "TZ=", 3) != 0) *newp++ = *p;
4259 if (timezone_string)
4261 *newp = store_malloc(Ustrlen(timezone_string) + 4);
4262 sprintf(CS *newp++, "TZ=%s", timezone_string);
4267 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
4268 tod_stamp(tod_log));
4272 /* Handle the case when we have removed the setuid privilege because of -C or
4273 -D. This means that the caller of Exim was not root.
4275 There is a problem if we were running as the Exim user. The sysadmin may
4276 expect this case to retain privilege because "the binary was called by the
4277 Exim user", but it hasn't, because either the -D option set macros, or the
4278 -C option set a non-trusted configuration file. There are two possibilities:
4280 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
4281 to do message deliveries. Thus, the fact that it is running as a
4282 non-privileged user is plausible, and might be wanted in some special
4283 configurations. However, really_exim will have been set false when
4284 privilege was dropped, to stop Exim trying to write to its normal log
4285 files. Therefore, re-enable normal log processing, assuming the sysadmin
4286 has set up the log directory correctly.
4288 (2) If deliver_drop_privilege is not set, the configuration won't work as
4289 apparently intended, and so we log a panic message. In order to retain
4290 root for -C or -D, the caller must either be root or be invoking a
4291 trusted configuration file (when deliver_drop_privilege is false). */
4293 if ( removed_privilege
4294 && (!f.trusted_config || opt_D_used)
4295 && real_uid == exim_uid)
4296 if (deliver_drop_privilege)
4297 f.really_exim = TRUE; /* let logging work normally */
4299 log_write(0, LOG_MAIN|LOG_PANIC,
4300 "exim user lost privilege for using %s option",
4301 f.trusted_config? "-D" : "-C");
4303 /* Start up Perl interpreter if Perl support is configured and there is a
4304 perl_startup option, and the configuration or the command line specifies
4305 initializing starting. Note that the global variables are actually called
4306 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
4309 if (perl_start_option != 0)
4310 opt_perl_at_start = (perl_start_option > 0);
4311 if (opt_perl_at_start && opt_perl_startup != NULL)
4314 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
4315 if ((errstr = init_perl(opt_perl_startup)))
4316 exim_fail("exim: error in perl_startup code: %s\n", errstr);
4317 opt_perl_started = TRUE;
4319 #endif /* EXIM_PERL */
4321 /* Log the arguments of the call if the configuration file said so. This is
4322 a debugging feature for finding out what arguments certain MUAs actually use.
4323 Don't attempt it if logging is disabled, or if listing variables or if
4324 verifying/testing addresses or expansions. */
4326 if ( (debug_selector & D_any || LOGGING(arguments))
4327 && f.really_exim && !list_options && !checking)
4329 uschar *p = big_buffer;
4330 Ustrcpy(p, US"cwd= (failed)");
4337 snprintf(CS p, big_buffer_size - (p - big_buffer), "%s", CCS initial_cwd);
4338 p += Ustrlen(CCS p);
4341 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
4343 for (int i = 0; i < argc; i++)
4345 int len = Ustrlen(argv[i]);
4346 const uschar *printing;
4348 if (p + len + 8 >= big_buffer + big_buffer_size)
4350 Ustrcpy(p, US" ...");
4351 log_write(0, LOG_MAIN, "%s", big_buffer);
4352 Ustrcpy(big_buffer, US"...");
4355 printing = string_printing(argv[i]);
4356 if (!*printing) quote = US"\"";
4359 const uschar *pp = printing;
4361 while (*pp) if (isspace(*pp++)) { quote = US"\""; break; }
4363 p += sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
4364 (p - big_buffer) - 4), printing, quote);
4367 if (LOGGING(arguments))
4368 log_write(0, LOG_MAIN, "%s", big_buffer);
4370 debug_printf("%s\n", big_buffer);
4373 /* Set the working directory to be the top-level spool directory. We don't rely
4374 on this in the code, which always uses fully qualified names, but it's useful
4375 for core dumps etc. Don't complain if it fails - the spool directory might not
4376 be generally accessible and calls with the -C option (and others) have lost
4377 privilege by now. Before the chdir, we try to ensure that the directory exists.
4380 if (Uchdir(spool_directory) != 0)
4382 (void) directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
4383 (void) Uchdir(spool_directory);
4386 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
4387 alias file. Exim doesn't have such a concept, but this call is screwed into
4388 Sun's YP makefiles. Handle this by calling a configured script, as the real
4389 user who called Exim. The -oA option can be used to pass an argument to the
4394 (void) fclose(config_file);
4395 if (bi_command && *bi_command)
4399 argv[i++] = bi_command; /* nonexpanded option so assume untainted */
4400 if (alias_arg) argv[i++] = alias_arg;
4403 setgroups(group_count, group_list);
4404 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
4406 DEBUG(D_exec) debug_printf("exec '%.256s' %s%.256s%s\n", argv[0],
4407 argv[1] ? "'" : "", argv[1] ? argv[1] : US"", argv[1] ? "'" : "");
4409 execv(CS argv[0], (char *const *)argv);
4410 exim_fail("exim: exec '%s' failed: %s\n", argv[0], strerror(errno));
4414 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
4419 /* We moved the admin/trusted check to be immediately after reading the
4420 configuration file. We leave these prints here to ensure that syslog setup,
4421 logfile setup, and so on has already happened. */
4423 if (f.trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
4424 if (f.admin_user) DEBUG(D_any) debug_printf("admin user\n");
4426 /* Only an admin user may start the daemon or force a queue run in the default
4427 configuration, but the queue run restriction can be relaxed. Only an admin
4428 user may request that a message be returned to its sender forthwith. Only an
4429 admin user may specify a debug level greater than D_v (because it might show
4430 passwords, etc. in lookup queries). Only an admin user may request a queue
4431 count. Only an admin user can use the test interface to scan for email
4432 (because Exim will be in the spool dir and able to look at mails). */
4436 BOOL debugset = (debug_selector & ~D_v) != 0;
4437 if ( deliver_give_up || f.daemon_listen || malware_test_file
4438 || count_queue && queue_list_requires_admin
4439 || list_queue && queue_list_requires_admin
4440 || queue_interval >= 0 && prod_requires_admin
4441 || queue_name_dest && prod_requires_admin
4442 || debugset && !f.running_in_test_harness
4444 exim_fail("exim:%s permission denied\n", debugset ? " debugging" : "");
4447 /* If the real user is not root or the exim uid, the argument for passing
4448 in an open TCP/IP connection for another message is not permitted, nor is
4449 running with the -N option for any delivery action, unless this call to exim is
4450 one that supplied an input message, or we are using a patched exim for
4451 regression testing. */
4453 if ( real_uid != root_uid && real_uid != exim_uid
4454 && ( continue_hostname
4456 && (queue_interval >= 0 || f.daemon_listen || msg_action_arg > 0)
4458 && !f.running_in_test_harness
4460 exim_fail("exim: Permission denied\n");
4462 /* If the caller is not trusted, certain arguments are ignored when running for
4463 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
4464 Note that authority for performing certain actions on messages is tested in the
4465 queue_action() function. */
4467 if (!f.trusted_caller && !checking)
4469 sender_host_name = sender_host_address = interface_address =
4470 sender_ident = received_protocol = NULL;
4471 sender_host_port = interface_port = 0;
4472 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
4475 /* If a sender host address is set, extract the optional port number off the
4476 end of it and check its syntax. Do the same thing for the interface address.
4477 Exim exits if the syntax is bad. */
4481 if (sender_host_address)
4482 sender_host_port = check_port(sender_host_address);
4483 if (interface_address)
4484 interface_port = check_port(interface_address);
4487 /* If the caller is trusted, then they can use -G to suppress_local_fixups. */
4490 if (f.trusted_caller)
4492 f.suppress_local_fixups = f.suppress_local_fixups_default = TRUE;
4493 DEBUG(D_acl) debug_printf("suppress_local_fixups forced on by -G\n");
4496 exim_fail("exim: permission denied (-G requires a trusted user)\n");
4499 /* If an SMTP message is being received check to see if the standard input is a
4500 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
4501 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
4506 union sockaddr_46 inetd_sock;
4507 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
4508 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
4510 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
4511 if (family == AF_INET || family == AF_INET6)
4513 union sockaddr_46 interface_sock;
4514 size = sizeof(interface_sock);
4516 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
4517 interface_address = host_ntoa(-1, &interface_sock, NULL,
4520 if (host_is_tls_on_connect_port(interface_port)) tls_in.on_connect = TRUE;
4522 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
4525 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
4526 NULL, &sender_host_port);
4527 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
4528 "inetd is not supported when mua_wrapper is set");
4532 "exim: Permission denied (unprivileged user, unprivileged port)\n");
4537 /* If the load average is going to be needed while receiving a message, get it
4538 now for those OS that require the first call to os_getloadavg() to be done as
4539 root. There will be further calls later for each message received. */
4541 #ifdef LOAD_AVG_NEEDS_ROOT
4542 if ( receiving_message
4543 && (queue_only_load >= 0 || (f.is_inetd && smtp_load_reserve >= 0)))
4544 load_average = OS_GETLOADAVG();
4547 /* The queue_only configuration option can be overridden by -odx on the command
4548 line, except that if queue_only_override is false, queue_only cannot be unset
4549 from the command line. */
4551 if (queue_only_set && (queue_only_override || arg_queue_only))
4552 queue_only = arg_queue_only;
4554 /* The receive_timeout and smtp_receive_timeout options can be overridden by
4557 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
4558 if (arg_smtp_receive_timeout >= 0)
4559 smtp_receive_timeout = arg_smtp_receive_timeout;
4561 /* If Exim was started with root privilege, unless we have already removed the
4562 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
4563 except when starting the daemon or doing some kind of delivery or address
4564 testing (-bt). These are the only cases when root need to be retained. We run
4565 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
4566 retained only for starting the daemon. We always do the initgroups() in this
4567 situation (controlled by the TRUE below), in order to be as close as possible
4568 to the state Exim usually runs in. */
4570 if ( !unprivileged /* originally had root AND */
4571 && !removed_privilege /* still got root AND */
4572 && !f.daemon_listen /* not starting the daemon */
4573 && queue_interval <= 0 /* (either kind of daemon) */
4574 && ( /* AND EITHER */
4575 deliver_drop_privilege /* requested unprivileged */
4577 queue_interval < 0 /* not running the queue */
4578 && ( msg_action_arg < 0 /* and */
4579 || msg_action != MSG_DELIVER /* not delivering */
4581 && (!checking || !f.address_test_mode) /* not address checking */
4582 && !rcpt_verify_quota /* and not quota checking */
4584 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
4586 /* When we are retaining a privileged uid, we still change to the exim gid. */
4591 DEBUG(D_any) debug_printf("dropping to exim gid; retaining priv uid\n");
4592 rv = setgid(exim_gid);
4593 /* Impact of failure is that some stuff might end up with an incorrect group.
4594 We track this for failures from root, since any attempt to change privilege
4595 by root should succeed and failures should be examined. For non-root,
4596 there's no security risk. For me, it's { exim -bV } on a just-built binary,
4597 no need to complain then. */
4599 if (!(unprivileged || removed_privilege))
4600 exim_fail("exim: changing group failed: %s\n", strerror(errno));
4603 DEBUG(D_any) debug_printf("changing group to %ld failed: %s\n",
4604 (long int)exim_gid, strerror(errno));
4608 /* Handle a request to scan a file for malware */
4609 if (malware_test_file)
4611 #ifdef WITH_CONTENT_SCAN
4613 set_process_info("scanning file for malware");
4614 if ((result = malware_in_file(malware_test_file)) == FAIL)
4616 printf("No malware found.\n");
4621 printf("Malware lookup returned non-okay/fail: %d\n", result);
4625 printf("Malware found: %s\n", malware_name);
4627 printf("Malware scan detected malware of unknown name.\n");
4629 printf("Malware scanning not enabled at compile time.\n");
4634 /* Handle a request to list the delivery queue */
4638 set_process_info("listing the queue");
4639 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
4643 /* Handle a request to count the delivery queue */
4647 set_process_info("counting the queue");
4648 fprintf(stdout, "%u\n", queue_count());
4652 /* Handle actions on specific messages, except for the force delivery and
4653 message load actions, which are done below. Some actions take a whole list of
4654 message ids, which are known to continue up to the end of the arguments. Others
4655 take a single message id and then operate on the recipients list. */
4657 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
4659 int yield = EXIT_SUCCESS;
4660 set_process_info("acting on specified messages");
4662 /* ACL definitions may be needed when removing a message (-Mrm) because
4663 event_action gets expanded */
4665 if (msg_action == MSG_REMOVE)
4667 int old_pool = store_pool;
4668 store_pool = POOL_CONFIG;
4670 store_pool = old_pool;
4671 store_writeprotect(POOL_CONFIG);
4674 if (!one_msg_action)
4676 for (i = msg_action_arg; i < argc; i++)
4677 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
4678 yield = EXIT_FAILURE;
4681 case MSG_REMOVE: case MSG_FREEZE: case MSG_THAW: break;
4682 default: printf("\n"); break;
4686 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
4687 recipients_arg)) yield = EXIT_FAILURE;
4691 /* We used to set up here to skip reading the ACL section, on
4692 (msg_action_arg > 0 || (queue_interval == 0 && !f.daemon_listen)
4693 Now, since the intro of the ${acl } expansion, ACL definitions may be
4694 needed in transports so we lost the optimisation. */
4697 int old_pool = store_pool;
4698 #ifdef MEASURE_TIMING
4700 (void)gettimeofday(&t0, NULL);
4703 store_pool = POOL_CONFIG;
4705 store_pool = old_pool;
4707 /* -be can add macro definitions, needing to link to the macro structure
4708 chain. Otherwise, make the memory used for config data readonly. */
4710 if (!expansion_test)
4711 store_writeprotect(POOL_CONFIG);
4713 #ifdef MEASURE_TIMING
4714 report_time_since(&t0, US"readconf_rest (delta)");
4718 /* Handle a request to check quota */
4719 if (rcpt_verify_quota)
4720 if (real_uid != root_uid && real_uid != exim_uid)
4721 exim_fail("exim: Permission denied\n");
4722 else if (recipients_arg >= argc)
4723 exim_fail("exim: missing recipient for quota check\n");
4726 verify_quota(argv[recipients_arg]);
4727 exim_exit(EXIT_SUCCESS);
4730 /* Handle the -brt option. This is for checking out retry configurations.
4731 The next three arguments are a domain name or a complete address, and
4732 optionally two error numbers. All it does is to call the function that
4733 scans the retry configuration data. */
4735 if (test_retry_arg >= 0)
4737 retry_config *yield;
4738 int basic_errno = 0;
4740 const uschar *s1, *s2;
4742 if (test_retry_arg >= argc)
4744 printf("-brt needs a domain or address argument\n");
4745 exim_exit(EXIT_FAILURE);
4747 s1 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_EMAILADDR_MAX, "-brt");
4750 /* If the first argument contains no @ and no . it might be a local user
4751 or it might be a single-component name. Treat as a domain. */
4753 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
4755 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
4756 "being \ntreated as a one-component domain, not as a local part.\n\n",
4760 /* There may be an optional second domain arg. */
4762 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
4763 s2 = exim_str_fail_toolong(argv[test_retry_arg++], EXIM_DOMAINNAME_MAX, "-brt 2nd");
4765 /* The final arg is an error name */
4767 if (test_retry_arg < argc)
4769 const uschar *ss = exim_str_fail_toolong(argv[test_retry_arg], EXIM_DRIVERNAME_MAX, "-brt 3rd");
4771 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
4774 printf("%s\n", CS error);
4775 return EXIT_FAILURE;
4778 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
4779 code > 100 as an error is for matching codes to the decade. Turn them into
4780 a real error code, off the decade. */
4782 if (basic_errno == ERRNO_MAIL4XX ||
4783 basic_errno == ERRNO_RCPT4XX ||
4784 basic_errno == ERRNO_DATA4XX)
4786 int code = (more_errno >> 8) & 255;
4788 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
4789 else if (code > 100)
4790 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
4794 if (!(yield = retry_find_config(s1, s2, basic_errno, more_errno)))
4795 printf("No retry information found\n");
4798 more_errno = yield->more_errno;
4799 printf("Retry rule: %s ", yield->pattern);
4801 if (yield->basic_errno == ERRNO_EXIMQUOTA)
4803 printf("quota%s%s ",
4804 (more_errno > 0)? "_" : "",
4805 (more_errno > 0)? readconf_printtime(more_errno) : US"");
4807 else if (yield->basic_errno == ECONNREFUSED)
4809 printf("refused%s%s ",
4810 (more_errno > 0)? "_" : "",
4811 (more_errno == 'M')? "MX" :
4812 (more_errno == 'A')? "A" : "");
4814 else if (yield->basic_errno == ETIMEDOUT)
4817 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
4819 if (more_errno != 0) printf("_%s",
4820 (more_errno == 'M')? "MX" : "A");
4823 else if (yield->basic_errno == ERRNO_AUTHFAIL)
4824 printf("auth_failed ");
4827 for (retry_rule * r = yield->rules; r; r = r->next)
4829 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
4830 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
4836 printf(",%d.", x/1000);
4850 exim_exit(EXIT_SUCCESS);
4853 /* Handle a request to list one or more configuration options */
4854 /* If -n was set, we suppress some information */
4859 set_process_info("listing variables");
4860 if (recipients_arg >= argc)
4861 fail = !readconf_print(US"all", NULL, flag_n);
4862 else for (i = recipients_arg; i < argc; i++)
4865 (Ustrcmp(argv[i], "router") == 0 ||
4866 Ustrcmp(argv[i], "transport") == 0 ||
4867 Ustrcmp(argv[i], "authenticator") == 0 ||
4868 Ustrcmp(argv[i], "macro") == 0 ||
4869 Ustrcmp(argv[i], "environment") == 0))
4871 fail |= !readconf_print(exim_str_fail_toolong(argv[i+1], EXIM_DRIVERNAME_MAX, "-bP name"), argv[i], flag_n);
4875 fail = !readconf_print(exim_str_fail_toolong(argv[i], EXIM_DRIVERNAME_MAX, "-bP item"), NULL, flag_n);
4877 exim_exit(fail ? EXIT_FAILURE : EXIT_SUCCESS);
4882 set_process_info("listing config");
4883 exim_exit(readconf_print(US"config", NULL, flag_n)
4884 ? EXIT_SUCCESS : EXIT_FAILURE);
4888 /* Initialise subsystems as required. */
4892 /* Handle a request to deliver one or more messages that are already on the
4893 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
4894 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
4896 Delivery of specific messages is typically used for a small number when
4897 prodding by hand (when the option forced_delivery will be set) or when
4898 re-execing to regain root privilege. Each message delivery must happen in a
4899 separate process, so we fork a process for each one, and run them sequentially
4900 so that debugging output doesn't get intertwined, and to avoid spawning too
4901 many processes if a long list is given. However, don't fork for the last one;
4902 this saves a process in the common case when Exim is called to deliver just one
4905 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
4907 if (prod_requires_admin && !f.admin_user)
4909 fprintf(stderr, "exim: Permission denied\n");
4910 exim_exit(EXIT_FAILURE);
4912 set_process_info("delivering specified messages");
4913 if (deliver_give_up) forced_delivery = f.deliver_force_thaw = TRUE;
4914 for (i = msg_action_arg; i < argc; i++)
4918 /*XXX This use of argv[i] for msg_id should really be tainted, but doing
4919 that runs into a later copy into the untainted global message_id[] */
4920 /*XXX Do we need a length limit check here? */
4922 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4923 else if ((pid = exim_fork(US"cmdline-delivery")) == 0)
4925 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
4926 exim_underbar_exit(EXIT_SUCCESS);
4930 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
4932 exim_exit(EXIT_FAILURE);
4936 exim_exit(EXIT_SUCCESS);
4940 /* If only a single queue run is requested, without SMTP listening, we can just
4941 turn into a queue runner, with an optional starting message id. */
4943 if (queue_interval == 0 && !f.daemon_listen)
4945 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
4946 start_queue_run_id ? US" starting at " : US"",
4947 start_queue_run_id ? start_queue_run_id: US"",
4948 stop_queue_run_id ? US" stopping at " : US"",
4949 stop_queue_run_id ? stop_queue_run_id : US"");
4951 set_process_info("running the '%s' queue (single queue run)", queue_name);
4953 set_process_info("running the queue (single queue run)");
4954 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4955 exim_exit(EXIT_SUCCESS);
4959 /* Find the login name of the real user running this process. This is always
4960 needed when receiving a message, because it is written into the spool file. It
4961 may also be used to construct a from: or a sender: header, and in this case we
4962 need the user's full name as well, so save a copy of it, checked for RFC822
4963 syntax and munged if necessary, if it hasn't previously been set by the -F
4964 argument. We may try to get the passwd entry more than once, in case NIS or
4965 other delays are in evidence. Save the home directory for use in filter testing
4970 if ((pw = getpwuid(real_uid)) != NULL)
4972 originator_login = string_copy(US pw->pw_name);
4973 originator_home = string_copy(US pw->pw_dir);
4975 /* If user name has not been set by -F, set it from the passwd entry
4976 unless -f has been used to set the sender address by a trusted user. */
4978 if (!originator_name)
4980 if (!sender_address || (!f.trusted_caller && filter_test == FTEST_NONE))
4982 uschar *name = US pw->pw_gecos;
4983 uschar *amp = Ustrchr(name, '&');
4986 /* Most Unix specify that a '&' character in the gecos field is
4987 replaced by a copy of the login name, and some even specify that
4988 the first character should be upper cased, so that's what we do. */
4993 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4994 (int)(amp - name), name, &loffset, originator_login, amp + 1);
4995 buffer[loffset] = toupper(buffer[loffset]);
4999 /* If a pattern for matching the gecos field was supplied, apply
5000 it and then expand the name string. */
5002 if (gecos_pattern && gecos_name)
5004 const pcre2_code *re;
5005 re = regex_must_compile(gecos_pattern, MCS_NOFLAGS, TRUE); /* Use malloc */
5007 if (regex_match_and_setup(re, name, 0, -1))
5009 uschar *new_name = expand_string(gecos_name);
5013 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
5014 "gecos field \"%s\"\n", new_name, name);
5017 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
5018 "\"%s\": %s\n", gecos_name, expand_string_message);
5020 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
5021 "gecos field \"%s\"\n", gecos_pattern, name);
5022 store_free((void *)re);
5024 originator_name = string_copy(name);
5027 /* A trusted caller has used -f but not -F */
5029 else originator_name = US"";
5032 /* Break the retry loop */
5037 if (++i > finduser_retries) break;
5041 /* If we cannot get a user login, log the incident and give up, unless the
5042 configuration specifies something to use. When running in the test harness,
5043 any setting of unknown_login overrides the actual name. */
5045 if (!originator_login || f.running_in_test_harness)
5049 originator_login = expand_string(unknown_login);
5050 if (!originator_name && unknown_username)
5051 originator_name = expand_string(unknown_username);
5052 if (!originator_name) originator_name = US"";
5054 if (!originator_login)
5055 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
5059 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
5062 originator_name = US parse_fix_phrase(originator_name, Ustrlen(originator_name));
5064 /* If a message is created by this call of Exim, the uid/gid of its originator
5065 are those of the caller. These values are overridden if an existing message is
5066 read in from the spool. */
5068 originator_uid = real_uid;
5069 originator_gid = real_gid;
5071 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
5072 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
5074 /* Run in daemon and/or queue-running mode. The function daemon_go() never
5075 returns. We leave this till here so that the originator_ fields are available
5076 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
5079 if (f.daemon_listen || f.inetd_wait_mode || queue_interval > 0)
5083 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
5084 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
5085 "mua_wrapper is set");
5088 # ifndef DISABLE_TLS
5089 /* This also checks that the library linkage is working and we can call
5090 routines in it, so call even if tls_require_ciphers is unset */
5092 # ifdef MEASURE_TIMING
5094 (void)gettimeofday(&t0, NULL);
5096 if (!tls_dropprivs_validate_require_cipher(FALSE))
5098 # ifdef MEASURE_TIMING
5099 report_time_since(&t0, US"validate_ciphers (delta)");
5107 /* If the sender ident has not been set (by a trusted caller) set it to
5108 the caller. This will get overwritten below for an inetd call. If a trusted
5109 caller has set it empty, unset it. */
5111 if (!sender_ident) sender_ident = originator_login;
5112 else if (!*sender_ident) sender_ident = NULL;
5114 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
5115 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
5116 originator_* variables set. */
5118 if (test_rewrite_arg >= 0)
5120 f.really_exim = FALSE;
5121 if (test_rewrite_arg >= argc)
5123 printf("-brw needs an address argument\n");
5124 exim_exit(EXIT_FAILURE);
5126 rewrite_test(exim_str_fail_toolong(argv[test_rewrite_arg], EXIM_EMAILADDR_MAX, "-brw"));
5127 exim_exit(EXIT_SUCCESS);
5130 /* A locally-supplied message is considered to be coming from a local user
5131 unless a trusted caller supplies a sender address with -f, or is passing in the
5132 message via SMTP (inetd invocation or otherwise). */
5134 if ( !sender_address && !smtp_input
5135 || !f.trusted_caller && filter_test == FTEST_NONE)
5137 f.sender_local = TRUE;
5139 /* A trusted caller can supply authenticated_sender and authenticated_id
5140 via -oMas and -oMai and if so, they will already be set. Otherwise, force
5141 defaults except when host checking. */
5143 if (!authenticated_sender && !host_checking)
5144 authenticated_sender = string_sprintf("%s@%s", originator_login,
5145 qualify_domain_sender);
5146 if (!authenticated_id && !host_checking)
5147 authenticated_id = originator_login;
5150 /* Trusted callers are always permitted to specify the sender address.
5151 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
5152 is specified is the empty address. However, if a trusted caller does not
5153 specify a sender address for SMTP input, we leave sender_address unset. This
5154 causes the MAIL commands to be honoured. */
5156 if ( !smtp_input && !sender_address
5157 || !receive_check_set_sender(sender_address))
5159 /* Either the caller is not permitted to set a general sender, or this is
5160 non-SMTP input and the trusted caller has not set a sender. If there is no
5161 sender, or if a sender other than <> is set, override with the originator's
5162 login (which will get qualified below), except when checking things. */
5164 if ( !sender_address /* No sender_address set */
5166 (sender_address[0] != 0 && /* Non-empty sender address, AND */
5167 !checking)) /* Not running tests, including filter tests */
5169 sender_address = originator_login;
5170 f.sender_address_forced = FALSE;
5171 sender_address_domain = 0;
5175 /* Remember whether an untrusted caller set the sender address */
5177 f.sender_set_untrusted = sender_address != originator_login && !f.trusted_caller;
5179 /* Ensure that the sender address is fully qualified unless it is the empty
5180 address, which indicates an error message, or doesn't exist (root caller, smtp
5181 interface, no -f argument). */
5183 if (sender_address && *sender_address && sender_address_domain == 0)
5184 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
5185 qualify_domain_sender);
5187 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
5189 /* Handle a request to verify a list of addresses, or test them for delivery.
5190 This must follow the setting of the sender address, since routers can be
5191 predicated upon the sender. If no arguments are given, read addresses from
5192 stdin. Set debug_level to at least D_v to get full output for address testing.
5195 if (verify_address_mode || f.address_test_mode)
5198 int flags = vopt_qualify;
5200 if (verify_address_mode)
5202 if (!verify_as_sender) flags |= vopt_is_recipient;
5203 DEBUG(D_verify) debug_print_ids(US"Verifying:");
5208 flags |= vopt_is_recipient;
5209 debug_selector |= D_v;
5210 debug_file = stderr;
5211 debug_fd = fileno(debug_file);
5212 DEBUG(D_verify) debug_print_ids(US"Address testing:");
5215 if (recipients_arg < argc)
5216 while (recipients_arg < argc)
5218 /* Supplied addresses are tainted since they come from a user */
5219 uschar * s = string_copy_taint(
5220 exim_str_fail_toolong(argv[recipients_arg++], EXIM_DISPLAYMAIL_MAX, "address verification"),
5224 BOOL finished = FALSE;
5225 uschar *ss = parse_find_address_end(s, FALSE);
5226 if (*ss == ',') *ss = 0; else finished = TRUE;
5227 test_address(s, flags, &exit_value);
5230 while (*++s == ',' || isspace(*s)) ;
5236 uschar * s = get_stdinput(NULL, NULL);
5238 test_address(string_copy_taint(
5239 exim_str_fail_toolong(s, EXIM_DISPLAYMAIL_MAX, "address verification (stdin)"),
5241 flags, &exit_value);
5245 exim_exit(exit_value);
5248 /* Handle expansion checking. Either expand items on the command line, or read
5249 from stdin if there aren't any. If -Mset was specified, load the message so
5250 that its variables can be used, but restrict this facility to admin users.
5251 Otherwise, if -bem was used, read a message from stdin. */
5255 dns_init(FALSE, FALSE, FALSE);
5256 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
5260 exim_fail("exim: permission denied\n");
5261 message_id = US exim_str_fail_toolong(argv[msg_action_arg], MESSAGE_ID_LENGTH, "message-id");
5262 /* Checking the length of the ID is sufficient to validate it.
5263 Get an untainted version so file opens can be done. */
5264 message_id = string_copy_taint(message_id, GET_UNTAINTED);
5266 spoolname = string_sprintf("%s-H", message_id);
5267 if ((deliver_datafile = spool_open_datafile(message_id)) < 0)
5268 printf ("Failed to load message datafile %s\n", message_id);
5269 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
5270 printf ("Failed to load message %s\n", message_id);
5273 /* Read a test message from a file. We fudge it up to be on stdin, saving
5274 stdin itself for later reading of expansion strings. */
5276 else if (expansion_test_message)
5278 int save_stdin = dup(0);
5279 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
5281 exim_fail("exim: failed to open %s: %s\n", expansion_test_message,
5284 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
5285 message_ended = END_NOTENDED;
5286 read_message_body(receive_msg(extract_recipients));
5287 message_linecount += body_linecount;
5288 (void)dup2(save_stdin, 0);
5289 (void)close(save_stdin);
5290 clearerr(stdin); /* Required by Darwin */
5293 /* Only admin users may see config-file macros this way */
5295 if (!f.admin_user) macros_user = macros = mlast = NULL;
5297 /* Allow $recipients for this testing */
5299 f.enable_dollar_recipients = TRUE;
5301 /* Expand command line items */
5303 if (recipients_arg < argc)
5304 while (recipients_arg < argc)
5305 expansion_test_line(exim_str_fail_toolong(argv[recipients_arg++], EXIM_EMAILADDR_MAX, "recipient"));
5311 char *(*fn_readline)(const char *) = NULL;
5312 void (*fn_addhist)(const char *) = NULL;
5316 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
5319 while (s = get_stdinput(fn_readline, fn_addhist))
5320 expansion_test_line(s);
5323 if (dlhandle) dlclose(dlhandle);
5327 /* The data file will be open after -Mset */
5329 if (deliver_datafile >= 0)
5331 (void)close(deliver_datafile);
5332 deliver_datafile = -1;
5335 exim_exit(EXIT_SUCCESS);
5339 /* The active host name is normally the primary host name, but it can be varied
5340 for hosts that want to play several parts at once. We need to ensure that it is
5341 set for host checking, and for receiving messages. */
5343 smtp_active_hostname = primary_hostname;
5344 if (raw_active_hostname != NULL)
5346 uschar *nah = expand_string(raw_active_hostname);
5349 if (!f.expand_string_forcedfail)
5350 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
5351 "(smtp_active_hostname): %s", raw_active_hostname,
5352 expand_string_message);
5354 else if (nah[0] != 0) smtp_active_hostname = nah;
5357 /* Handle host checking: this facility mocks up an incoming SMTP call from a
5358 given IP address so that the blocking and relay configuration can be tested.
5359 Unless a sender_ident was set by -oMt, we discard it (the default is the
5360 caller's login name). An RFC 1413 call is made only if we are running in the
5361 test harness and an incoming interface and both ports are specified, because
5362 there is no TCP/IP call to find the ident for. */
5369 if (!sender_ident_set)
5371 sender_ident = NULL;
5372 if (f.running_in_test_harness && sender_host_port
5373 && interface_address && interface_port)
5374 verify_get_ident(1223); /* note hardwired port number */
5377 /* In case the given address is a non-canonical IPv6 address, canonicalize
5378 it. The code works for both IPv4 and IPv6, as it happens. */
5380 size = host_aton(sender_host_address, x);
5381 sender_host_address = store_get(48, GET_UNTAINTED); /* large enough for full IPv6 */
5382 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
5384 /* Now set up for testing */
5386 host_build_sender_fullhost();
5390 f.sender_local = FALSE;
5391 f.sender_host_notsocket = TRUE;
5392 debug_file = stderr;
5393 debug_fd = fileno(debug_file);
5394 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
5395 "**** but without any ident (RFC 1413) callback.\n"
5396 "**** This is not for real!\n\n",
5397 sender_host_address);
5399 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5400 if (verify_check_host(&hosts_connection_nolog) == OK)
5402 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5403 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5405 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5407 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5408 because a log line has already been written for all its failure exists
5409 (usually "connection refused: <reason>") and writing another one is
5410 unnecessary clutter. */
5412 if (smtp_start_session())
5415 for (; (reset_point = store_mark()); store_reset(reset_point))
5417 if (smtp_setup_msg() <= 0) break;
5418 if (!receive_msg(FALSE)) break;
5420 return_path = sender_address = NULL;
5421 dnslist_domain = dnslist_matched = NULL;
5422 #ifndef DISABLE_DKIM
5423 dkim_cur_signer = NULL;
5426 deliver_localpart_orig = NULL;
5427 deliver_domain_orig = NULL;
5428 callout_address = sending_ip_address = NULL;
5429 deliver_localpart_data = deliver_domain_data =
5430 recipient_data = sender_data = NULL;
5431 sender_rate = sender_rate_limit = sender_rate_period = NULL;
5435 exim_exit(EXIT_SUCCESS);
5439 /* Arrange for message reception if recipients or SMTP were specified;
5440 otherwise complain unless a version print (-bV) happened or this is a filter
5441 verification test or info dump.
5442 In the former case, show the configuration file name. */
5444 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
5446 if (version_printed)
5448 if (Ustrchr(config_main_filelist, ':'))
5449 printf("Configuration file search path is %s\n", config_main_filelist);
5450 printf("Configuration file is %s\n", config_main_filename);
5451 return EXIT_SUCCESS;
5454 if (info_flag != CMDINFO_NONE)
5456 show_exim_information(info_flag, info_stdout ? stdout : stderr);
5457 return info_stdout ? EXIT_SUCCESS : EXIT_FAILURE;
5460 if (filter_test == FTEST_NONE)
5461 exim_usage(called_as);
5465 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
5466 standard input into an MUA that submits to a smarthost over TCP/IP. We know
5467 that we are not called from inetd, because that is rejected above. The
5468 following configuration settings are forced here:
5470 (1) Synchronous delivery (-odi)
5471 (2) Errors to stderr (-oep == -oeq)
5472 (3) No parallel remote delivery
5473 (4) Unprivileged delivery
5475 We don't force overall queueing options because there are several of them;
5476 instead, queueing is avoided below when mua_wrapper is set. However, we do need
5477 to override any SMTP queueing. */
5481 f.synchronous_delivery = TRUE;
5482 arg_error_handling = ERRORS_STDERR;
5483 remote_max_parallel = 1;
5484 deliver_drop_privilege = TRUE;
5485 f.queue_smtp = FALSE;
5486 queue_smtp_domains = NULL;
5488 message_utf8_downconvert = -1; /* convert-if-needed */
5493 /* Prepare to accept one or more new messages on the standard input. When a
5494 message has been read, its id is returned in message_id[]. If doing immediate
5495 delivery, we fork a delivery process for each received message, except for the
5496 last one, where we can save a process switch.
5498 It is only in non-smtp mode that error_handling is allowed to be changed from
5499 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
5500 sendmail error modes other than -oem ever actually used? Later: yes.) */
5502 if (!smtp_input) error_handling = arg_error_handling;
5504 /* If this is an inetd call, ensure that stderr is closed to prevent panic
5505 logging being sent down the socket and make an identd call to get the
5508 else if (f.is_inetd)
5510 (void)fclose(stderr);
5511 exim_nullstd(); /* Re-open to /dev/null */
5512 verify_get_ident(IDENT_PORT);
5513 host_build_sender_fullhost();
5514 set_process_info("handling incoming connection from %s via inetd",
5518 /* If the sender host address has been set, build sender_fullhost if it hasn't
5519 already been done (which it will have been for inetd). This caters for the
5520 case when it is forced by -oMa. However, we must flag that it isn't a socket,
5521 so that the test for IP options is skipped for -bs input. */
5523 if (sender_host_address && !sender_fullhost)
5525 host_build_sender_fullhost();
5526 set_process_info("handling incoming connection from %s via -oMa",
5528 f.sender_host_notsocket = TRUE;
5531 /* Otherwise, set the sender host as unknown except for inetd calls. This
5532 prevents host checking in the case of -bs not from inetd and also for -bS. */
5534 else if (!f.is_inetd) f.sender_host_unknown = TRUE;
5536 /* If stdout does not exist, then dup stdin to stdout. This can happen
5537 if exim is started from inetd. In this case fd 0 will be set to the socket,
5538 but fd 1 will not be set. This also happens for passed SMTP channels. */
5540 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
5542 /* Set up the incoming protocol name and the state of the program. Root is
5543 allowed to force received protocol via the -oMr option above. If we have come
5544 via inetd, the process info has already been set up. We don't set
5545 received_protocol here for smtp input, as it varies according to
5546 batch/HELO/EHLO/AUTH/TLS. */
5550 if (!f.is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
5551 smtp_batched_input? "batched " : "",
5552 sender_address ? sender_address : originator_login);
5556 int old_pool = store_pool;
5557 store_pool = POOL_PERM;
5558 if (!received_protocol)
5559 received_protocol = string_sprintf("local%s", called_as);
5560 store_pool = old_pool;
5561 set_process_info("accepting a local non-SMTP message from <%s>",
5565 /* Initialize the session_local_queue-only flag (this will be ignored if
5566 mua_wrapper is set) */
5569 session_local_queue_only = queue_only;
5571 /* For non-SMTP and for batched SMTP input, check that there is enough space on
5572 the spool if so configured. On failure, we must not attempt to send an error
5573 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
5574 error code is given.) */
5576 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
5577 exim_fail("exim: insufficient disk space\n");
5579 /* If this is smtp input of any kind, real or batched, handle the start of the
5582 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
5583 because a log line has already been written for all its failure exists
5584 (usually "connection refused: <reason>") and writing another one is
5585 unnecessary clutter. */
5591 memset(sender_host_cache, 0, sizeof(sender_host_cache));
5592 if (verify_check_host(&hosts_connection_nolog) == OK)
5594 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_connection);
5595 BIT_CLEAR(log_selector, log_selector_size, Li_smtp_no_mail);
5597 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
5598 if (!smtp_start_session())
5601 exim_exit(EXIT_SUCCESS);
5605 /* Otherwise, set up the input size limit here and set no stdin stdio buffer
5606 (we handle buferring so as to have visibility of fill level). */
5610 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
5611 if (expand_string_message)
5612 if (thismessage_size_limit == -1)
5613 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
5614 "message_size_limit: %s", expand_string_message);
5616 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
5617 "message_size_limit: %s", expand_string_message);
5619 setvbuf(stdin, NULL, _IONBF, 0);
5622 /* Loop for several messages when reading SMTP input. If we fork any child
5623 processes, we don't want to wait for them unless synchronous delivery is
5624 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
5625 same as SIG_DFL, despite the fact that documentation often lists the default as
5626 "ignore". This is a confusing area. This is what I know:
5628 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
5629 processes that complete simply to go away without ever becoming defunct. You
5630 can't then wait for them - but we don't want to wait for them in the
5631 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
5632 happen for all OS (e.g. *BSD is different).
5634 But that's not the end of the story. Some (many? all?) systems have the
5635 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
5636 has by default, so it seems that the difference is merely one of default
5637 (compare restarting vs non-restarting signals).
5639 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
5640 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
5641 of the loop below. Paranoia rules.
5643 February 2003: That's *still* not the end of the story. There are now versions
5644 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
5645 process then calls waitpid(), a grumble is written to the system log, because
5646 this is logically inconsistent. In other words, it doesn't like the paranoia.
5647 As a consequence of this, the waitpid() below is now excluded if we are sure
5648 that SIG_IGN works. */
5650 if (!f.synchronous_delivery)
5653 struct sigaction act;
5654 act.sa_handler = SIG_IGN;
5655 sigemptyset(&(act.sa_mask));
5656 act.sa_flags = SA_NOCLDWAIT;
5657 sigaction(SIGCHLD, &act, NULL);
5659 signal(SIGCHLD, SIG_IGN);
5663 /* Save the current store pool point, for resetting at the start of
5664 each message, and save the real sender address, if any. */
5666 real_sender_address = sender_address;
5668 /* Loop to receive messages; receive_msg() returns TRUE if there are more
5669 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
5672 for (BOOL more = TRUE; more; )
5674 rmark reset_point = store_mark();
5677 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
5678 input and build the recipients list, before calling receive_msg() to read the
5679 message proper. Whatever sender address is given in the SMTP transaction is
5680 often ignored for local senders - we use the actual sender, which is normally
5681 either the underlying user running this process or a -f argument provided by
5682 a trusted caller. It is saved in real_sender_address. The test for whether to
5683 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
5688 if ((rc = smtp_setup_msg()) > 0)
5690 if (real_sender_address != NULL &&
5691 !receive_check_set_sender(sender_address))
5693 sender_address = raw_sender = real_sender_address;
5694 sender_address_unrewritten = NULL;
5697 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
5698 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
5699 the very end. The result of the ACL is ignored (as for other non-SMTP
5700 messages). It is run for its potential side effects. */
5702 if (smtp_batched_input && acl_not_smtp_start != NULL)
5704 uschar *user_msg, *log_msg;
5705 f.enable_dollar_recipients = TRUE;
5706 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5707 &user_msg, &log_msg);
5708 f.enable_dollar_recipients = FALSE;
5711 /* Now get the data for the message */
5713 more = receive_msg(extract_recipients);
5716 cancel_cutthrough_connection(TRUE, US"receive dropped");
5717 if (more) goto MORELOOP;
5718 smtp_log_no_mail(); /* Log no mail if configured */
5719 exim_exit(EXIT_FAILURE);
5724 cancel_cutthrough_connection(TRUE, US"message setup dropped");
5725 smtp_log_no_mail(); /* Log no mail if configured */
5726 exim_exit(rc ? EXIT_FAILURE : EXIT_SUCCESS);
5730 /* In the non-SMTP case, we have all the information from the command
5731 line, but must process it in case it is in the more general RFC822
5732 format, and in any case, to detect syntax errors. Also, it appears that
5733 the use of comma-separated lists as single arguments is common, so we
5734 had better support them. */
5739 int count = argc - recipients_arg;
5740 uschar **list = argv + recipients_arg;
5742 /* These options cannot be changed dynamically for non-SMTP messages */
5744 f.active_local_sender_retain = local_sender_retain;
5745 f.active_local_from_check = local_from_check;
5747 /* Save before any rewriting */
5749 raw_sender = string_copy(sender_address);
5751 /* Loop for each argument (supplied by user hence tainted) */
5753 for (int i = 0; i < count; i++)
5755 int start, end, domain;
5757 /* There can be multiple addresses, so EXIM_DISPLAYMAIL_MAX (tuned for 1) is too short.
5758 * We'll still want to cap it to something, just in case. */
5759 uschar * s = string_copy_taint(
5760 exim_str_fail_toolong(list[i], BIG_BUFFER_SIZE, "address argument"),
5763 /* Loop for each comma-separated address */
5767 BOOL finished = FALSE;
5769 uschar *ss = parse_find_address_end(s, FALSE);
5771 if (*ss == ',') *ss = 0; else finished = TRUE;
5773 /* Check max recipients - if -t was used, these aren't recipients */
5775 if (recipients_max > 0 && ++rcount > recipients_max &&
5776 !extract_recipients)
5777 if (error_handling == ERRORS_STDERR)
5779 fprintf(stderr, "exim: too many recipients\n");
5780 exim_exit(EXIT_FAILURE);
5784 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
5785 errors_sender_rc : EXIT_FAILURE;
5789 BOOL b = allow_utf8_domains;
5790 allow_utf8_domains = TRUE;
5793 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
5797 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
5798 else allow_utf8_domains = b;
5803 if (domain == 0 && !f.allow_unqualified_recipient)
5806 errmess = US"unqualified recipient address not allowed";
5810 if (error_handling == ERRORS_STDERR)
5812 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
5813 string_printing(list[i]), errmess);
5814 exim_exit(EXIT_FAILURE);
5820 eblock.text1 = string_printing(list[i]);
5821 eblock.text2 = errmess;
5823 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
5824 errors_sender_rc : EXIT_FAILURE;
5827 receive_add_recipient(string_copy_taint(recipient, GET_TAINTED), -1);
5830 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
5834 /* Show the recipients when debugging */
5838 if (sender_address) debug_printf("Sender: %s\n", sender_address);
5839 if (recipients_list)
5841 debug_printf("Recipients:\n");
5842 for (int i = 0; i < recipients_count; i++)
5843 debug_printf(" %s\n", recipients_list[i].address);
5847 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
5848 ignored; rejecting here would just add complication, and it can just as
5849 well be done later. Allow $recipients to be visible in the ACL. */
5851 if (acl_not_smtp_start)
5853 uschar *user_msg, *log_msg;
5854 f.enable_dollar_recipients = TRUE;
5855 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
5856 &user_msg, &log_msg);
5857 f.enable_dollar_recipients = FALSE;
5860 /* Pause for a while waiting for input. If none received in that time,
5861 close the logfile, if we had one open; then if we wait for a long-running
5862 datasource (months, in one use-case) log rotation will not leave us holding
5865 if (!receive_timeout)
5866 if (poll_one_fd(0, POLLIN, 30*60*1000) == 0) /* 30 minutes */
5869 /* Read the data for the message. If filter_test is not FTEST_NONE, this
5870 will just read the headers for the message, and not write anything onto the
5873 message_ended = END_NOTENDED;
5874 more = receive_msg(extract_recipients);
5876 /* more is always FALSE here (not SMTP message) when reading a message
5877 for real; when reading the headers of a message for filter testing,
5878 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
5880 if (!message_id[0]) exim_exit(EXIT_FAILURE);
5881 } /* Non-SMTP message reception */
5883 /* If this is a filter testing run, there are headers in store, but
5884 no message on the spool. Run the filtering code in testing mode, setting
5885 the domain to the qualify domain and the local part to the current user,
5886 unless they have been set by options. The prefix and suffix are left unset
5887 unless specified. The the return path is set to to the sender unless it has
5888 already been set from a return-path header in the message. */
5890 if (filter_test != FTEST_NONE)
5892 deliver_domain = ftest_domain ? ftest_domain : qualify_domain_recipient;
5893 deliver_domain_orig = deliver_domain;
5894 deliver_localpart = ftest_localpart ? US ftest_localpart : originator_login;
5895 deliver_localpart_orig = deliver_localpart;
5896 deliver_localpart_prefix = US ftest_prefix;
5897 deliver_localpart_suffix = US ftest_suffix;
5898 deliver_home = originator_home;
5902 printf("Return-path copied from sender\n");
5903 return_path = string_copy(sender_address);
5906 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
5907 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
5909 receive_add_recipient(
5910 string_sprintf("%s%s%s@%s",
5911 ftest_prefix ? ftest_prefix : US"",
5913 ftest_suffix ? ftest_suffix : US"",
5914 deliver_domain), -1);
5916 printf("Recipient = %s\n", recipients_list[0].address);
5917 if (ftest_prefix) printf("Prefix = %s\n", ftest_prefix);
5918 if (ftest_suffix) printf("Suffix = %s\n", ftest_suffix);
5920 if (chdir("/")) /* Get away from wherever the user is running this from */
5922 DEBUG(D_receive) debug_printf("chdir(\"/\") failed\n");
5923 exim_exit(EXIT_FAILURE);
5926 /* Now we run either a system filter test, or a user filter test, or both.
5927 In the latter case, headers added by the system filter will persist and be
5928 available to the user filter. We need to copy the filter variables
5931 if (filter_test & FTEST_SYSTEM)
5932 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
5933 exim_exit(EXIT_FAILURE);
5935 memcpy(filter_sn, filter_n, sizeof(filter_sn));
5937 if (filter_test & FTEST_USER)
5938 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
5939 exim_exit(EXIT_FAILURE);
5941 exim_exit(EXIT_SUCCESS);
5944 /* Else act on the result of message reception. We should not get here unless
5945 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
5946 will be TRUE. If it is not, check on the number of messages received in this
5949 if ( !session_local_queue_only
5950 && smtp_accept_queue_per_connection > 0
5951 && receive_messagecount > smtp_accept_queue_per_connection)
5953 session_local_queue_only = TRUE;
5954 queue_only_reason = 2;
5957 /* Initialize local_queue_only from session_local_queue_only. If it is false,
5958 and queue_only_load is set, check that the load average is below it. If it is
5959 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
5960 default), we put the whole session into queue_only mode. It then remains this
5961 way for any subsequent messages on the same SMTP connection. This is a
5962 deliberate choice; even though the load average may fall, it doesn't seem
5963 right to deliver later messages on the same call when not delivering earlier
5964 ones. However, there are odd cases where this is not wanted, so this can be
5965 changed by setting queue_only_load_latch false. */
5967 if (!(local_queue_only = session_local_queue_only) && queue_only_load >= 0)
5968 if ((local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load))
5970 queue_only_reason = 3;
5971 if (queue_only_load_latch) session_local_queue_only = TRUE;
5974 /* If running as an MUA wrapper, all queueing options and freezing options
5978 local_queue_only = f.queue_only_policy = f.deliver_freeze = FALSE;
5980 /* Log the queueing here, when it will get a message id attached, but
5981 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
5984 if (local_queue_only)
5986 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
5987 switch(queue_only_reason)
5990 log_write(L_delay_delivery,
5991 LOG_MAIN, "no immediate delivery: more than %d messages "
5992 "received in one connection", smtp_accept_queue_per_connection);
5996 log_write(L_delay_delivery,
5997 LOG_MAIN, "no immediate delivery: load average %.2f",
5998 (double)load_average/1000.0);
6003 else if (f.queue_only_policy || f.deliver_freeze)
6004 cancel_cutthrough_connection(TRUE, US"no delivery; queueing");
6006 /* Else do the delivery unless the ACL or local_scan() called for queue only
6007 or froze the message. Always deliver in a separate process. A fork failure is
6008 not a disaster, as the delivery will eventually happen on a subsequent queue
6009 run. The search cache must be tidied before the fork, as the parent will
6010 do it before exiting. The child will trigger a lookup failure and
6011 thereby defer the delivery if it tries to use (for example) a cached ldap
6012 connection that the parent has called unbind on. */
6019 if ((pid = exim_fork(US"local-accept-delivery")) == 0)
6022 close_unwanted(); /* Close unwanted file descriptors and TLS */
6023 exim_nullstd(); /* Ensure std{in,out,err} exist */
6025 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
6026 mode, deliver_drop_privilege is forced TRUE). */
6028 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
6030 delivery_re_exec(CEE_EXEC_EXIT);
6031 /* Control does not return here. */
6034 /* No need to re-exec */
6036 rc = deliver_message(message_id, FALSE, FALSE);
6038 exim_underbar_exit(!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED
6039 ? EXIT_SUCCESS : EXIT_FAILURE);
6044 cancel_cutthrough_connection(TRUE, US"delivery fork failed");
6045 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
6046 "process: %s", strerror(errno));
6050 release_cutthrough_connection(US"msg passed for delivery");
6052 /* In the parent, wait if synchronous delivery is required. This will
6053 always be the case in MUA wrapper mode. */
6055 if (f.synchronous_delivery)
6058 while (wait(&status) != pid);
6059 if ((status & 0x00ff) != 0)
6060 log_write(0, LOG_MAIN|LOG_PANIC,
6061 "process %d crashed with signal %d while delivering %s",
6062 (int)pid, status & 0x00ff, message_id);
6063 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
6068 /* The loop will repeat if more is TRUE. If we do not know know that the OS
6069 automatically reaps children (see comments above the loop), clear away any
6070 finished subprocesses here, in case there are lots of messages coming in
6071 from the same source. */
6073 #ifndef SIG_IGN_WORKS
6074 while (waitpid(-1, NULL, WNOHANG) > 0);
6078 return_path = sender_address = NULL;
6079 authenticated_sender = NULL;
6080 deliver_localpart_orig = NULL;
6081 deliver_domain_orig = NULL;
6082 deliver_host = deliver_host_address = NULL;
6083 dnslist_domain = dnslist_matched = NULL;
6084 #ifdef WITH_CONTENT_SCAN
6085 malware_name = NULL;
6087 callout_address = NULL;
6088 sending_ip_address = NULL;
6089 deliver_localpart_data = deliver_domain_data =
6090 recipient_data = sender_data = NULL;
6092 for(int i = 0; i < REGEX_VARS; i++) regex_vars[i] = NULL;
6094 store_reset(reset_point);
6097 exim_exit(EXIT_SUCCESS); /* Never returns */
6098 return 0; /* To stop compiler warning */