1 /* $Cambridge: exim/src/src/exim.c,v 1.60 2008/01/17 13:03:35 tom Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2007 */
8 /* See the file NOTICE for conditions of use and distribution. */
11 /* The main function: entry point, initialization, and high-level control.
12 Also a few functions that don't naturally fit elsewhere. */
19 /*************************************************
20 * Function interface to store functions *
21 *************************************************/
23 /* We need some real functions to pass to the PCRE regular expression library
24 for store allocation via Exim's store manager. The normal calls are actually
25 macros that pass over location information to make tracing easier. These
26 functions just interface to the standard macro calls. A good compiler will
27 optimize out the tail recursion and so not make them too expensive. There
28 are two sets of functions; one for use when we want to retain the compiled
29 regular expression for a long time; the other for short-term use. */
32 function_store_get(size_t size)
34 return store_get((int)size);
38 function_dummy_free(void *block) { block = block; }
41 function_store_malloc(size_t size)
43 return store_malloc((int)size);
47 function_store_free(void *block)
55 /*************************************************
56 * Compile regular expression and panic on fail *
57 *************************************************/
59 /* This function is called when failure to compile a regular expression leads
60 to a panic exit. In other cases, pcre_compile() is called directly. In many
61 cases where this function is used, the results of the compilation are to be
62 placed in long-lived store, so we temporarily reset the store management
63 functions that PCRE uses if the use_malloc flag is set.
66 pattern the pattern to compile
67 caseless TRUE if caseless matching is required
68 use_malloc TRUE if compile into malloc store
70 Returns: pointer to the compiled pattern
74 regex_must_compile(uschar *pattern, BOOL caseless, BOOL use_malloc)
77 int options = PCRE_COPT;
82 pcre_malloc = function_store_malloc;
83 pcre_free = function_store_free;
85 if (caseless) options |= PCRE_CASELESS;
86 yield = pcre_compile(CS pattern, options, (const char **)&error, &offset, NULL);
87 pcre_malloc = function_store_get;
88 pcre_free = function_dummy_free;
90 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "regular expression error: "
91 "%s at offset %d while compiling %s", error, offset, pattern);
98 /*************************************************
99 * Execute regular expression and set strings *
100 *************************************************/
102 /* This function runs a regular expression match, and sets up the pointers to
103 the matched substrings.
106 re the compiled expression
107 subject the subject string
108 options additional PCRE options
109 setup if < 0 do full setup
110 if >= 0 setup from setup+1 onwards,
111 excluding the full matched string
113 Returns: TRUE or FALSE
117 regex_match_and_setup(const pcre *re, uschar *subject, int options, int setup)
119 int ovector[3*(EXPAND_MAXN+1)];
120 int n = pcre_exec(re, NULL, CS subject, Ustrlen(subject), 0,
121 PCRE_EOPT | options, ovector, sizeof(ovector)/sizeof(int));
123 if (n == 0) n = EXPAND_MAXN + 1;
127 expand_nmax = (setup < 0)? 0 : setup + 1;
128 for (nn = (setup < 0)? 0 : 2; nn < n*2; nn += 2)
130 expand_nstring[expand_nmax] = subject + ovector[nn];
131 expand_nlength[expand_nmax++] = ovector[nn+1] - ovector[nn];
141 /*************************************************
142 * Handler for SIGUSR1 *
143 *************************************************/
145 /* SIGUSR1 causes any exim process to write to the process log details of
146 what it is currently doing. It will only be used if the OS is capable of
147 setting up a handler that causes automatic restarting of any system call
148 that is in progress at the time.
150 Argument: the signal number (SIGUSR1)
155 usr1_handler(int sig)
157 sig = sig; /* Keep picky compilers happy */
158 log_write(0, LOG_PROCESS, "%s", process_info);
160 os_restarting_signal(SIGUSR1, usr1_handler);
165 /*************************************************
167 *************************************************/
169 /* This handler is enabled most of the time that Exim is running. The handler
170 doesn't actually get used unless alarm() has been called to set a timer, to
171 place a time limit on a system call of some kind. When the handler is run, it
174 There are some other SIGALRM handlers that are used in special cases when more
175 than just a flag setting is required; for example, when reading a message's
176 input. These are normally set up in the code module that uses them, and the
177 SIGALRM handler is reset to this one afterwards.
179 Argument: the signal value (SIGALRM)
184 sigalrm_handler(int sig)
186 sig = sig; /* Keep picky compilers happy */
188 os_non_restarting_signal(SIGALRM, sigalrm_handler);
193 /*************************************************
194 * Sleep for a fractional time interval *
195 *************************************************/
197 /* This function is called by millisleep() and exim_wait_tick() to wait for a
198 period of time that may include a fraction of a second. The coding is somewhat
199 tedious. We do not expect setitimer() ever to fail, but if it does, the process
200 will wait for ever, so we panic in this instance. (There was a case of this
201 when a bug in a function that calls milliwait() caused it to pass invalid data.
202 That's when I added the check. :-)
204 Argument: an itimerval structure containing the interval
209 milliwait(struct itimerval *itval)
212 sigset_t old_sigmask;
213 (void)sigemptyset(&sigmask); /* Empty mask */
214 (void)sigaddset(&sigmask, SIGALRM); /* Add SIGALRM */
215 (void)sigprocmask(SIG_BLOCK, &sigmask, &old_sigmask); /* Block SIGALRM */
216 if (setitimer(ITIMER_REAL, itval, NULL) < 0) /* Start timer */
217 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
218 "setitimer() failed: %s", strerror(errno));
219 (void)sigfillset(&sigmask); /* All signals */
220 (void)sigdelset(&sigmask, SIGALRM); /* Remove SIGALRM */
221 (void)sigsuspend(&sigmask); /* Until SIGALRM */
222 (void)sigprocmask(SIG_SETMASK, &old_sigmask, NULL); /* Restore mask */
228 /*************************************************
229 * Millisecond sleep function *
230 *************************************************/
232 /* The basic sleep() function has a granularity of 1 second, which is too rough
233 in some cases - for example, when using an increasing delay to slow down
236 Argument: number of millseconds
243 struct itimerval itval;
244 itval.it_interval.tv_sec = 0;
245 itval.it_interval.tv_usec = 0;
246 itval.it_value.tv_sec = msec/1000;
247 itval.it_value.tv_usec = (msec % 1000) * 1000;
253 /*************************************************
254 * Compare microsecond times *
255 *************************************************/
262 Returns: -1, 0, or +1
266 exim_tvcmp(struct timeval *t1, struct timeval *t2)
268 if (t1->tv_sec > t2->tv_sec) return +1;
269 if (t1->tv_sec < t2->tv_sec) return -1;
270 if (t1->tv_usec > t2->tv_usec) return +1;
271 if (t1->tv_usec < t2->tv_usec) return -1;
278 /*************************************************
279 * Clock tick wait function *
280 *************************************************/
282 /* Exim uses a time + a pid to generate a unique identifier in two places: its
283 message IDs, and in file names for maildir deliveries. Because some OS now
284 re-use pids within the same second, sub-second times are now being used.
285 However, for absolute certaintly, we must ensure the clock has ticked before
286 allowing the relevant process to complete. At the time of implementation of
287 this code (February 2003), the speed of processors is such that the clock will
288 invariably have ticked already by the time a process has done its job. This
289 function prepares for the time when things are faster - and it also copes with
290 clocks that go backwards.
293 then_tv A timeval which was used to create uniqueness; its usec field
294 has been rounded down to the value of the resolution.
295 We want to be sure the current time is greater than this.
296 resolution The resolution that was used to divide the microseconds
297 (1 for maildir, larger for message ids)
303 exim_wait_tick(struct timeval *then_tv, int resolution)
305 struct timeval now_tv;
306 long int now_true_usec;
308 (void)gettimeofday(&now_tv, NULL);
309 now_true_usec = now_tv.tv_usec;
310 now_tv.tv_usec = (now_true_usec/resolution) * resolution;
312 if (exim_tvcmp(&now_tv, then_tv) <= 0)
314 struct itimerval itval;
315 itval.it_interval.tv_sec = 0;
316 itval.it_interval.tv_usec = 0;
317 itval.it_value.tv_sec = then_tv->tv_sec - now_tv.tv_sec;
318 itval.it_value.tv_usec = then_tv->tv_usec + resolution - now_true_usec;
320 /* We know that, overall, "now" is less than or equal to "then". Therefore, a
321 negative value for the microseconds is possible only in the case when "now"
322 is more than a second less than "then". That means that itval.it_value.tv_sec
323 is greater than zero. The following correction is therefore safe. */
325 if (itval.it_value.tv_usec < 0)
327 itval.it_value.tv_usec += 1000000;
328 itval.it_value.tv_sec -= 1;
331 DEBUG(D_transport|D_receive)
333 if (!running_in_test_harness)
335 debug_printf("tick check: %lu.%06lu %lu.%06lu\n",
336 then_tv->tv_sec, then_tv->tv_usec, now_tv.tv_sec, now_tv.tv_usec);
337 debug_printf("waiting %lu.%06lu\n", itval.it_value.tv_sec,
338 itval.it_value.tv_usec);
349 /*************************************************
350 * Set up processing details *
351 *************************************************/
353 /* Save a text string for dumping when SIGUSR1 is received.
354 Do checks for overruns.
356 Arguments: format and arguments, as for printf()
361 set_process_info(char *format, ...)
365 sprintf(CS process_info, "%5d ", (int)getpid());
366 len = Ustrlen(process_info);
367 va_start(ap, format);
368 if (!string_vformat(process_info + len, PROCESS_INFO_SIZE - len, format, ap))
369 Ustrcpy(process_info + len, "**** string overflowed buffer ****");
370 DEBUG(D_process_info) debug_printf("set_process_info: %s\n", process_info);
378 /*************************************************
379 * Call fopen() with umask 777 and adjust mode *
380 *************************************************/
382 /* Exim runs with umask(0) so that files created with open() have the mode that
383 is specified in the open() call. However, there are some files, typically in
384 the spool directory, that are created with fopen(). They end up world-writeable
385 if no precautions are taken. Although the spool directory is not accessible to
386 the world, this is an untidiness. So this is a wrapper function for fopen()
387 that sorts out the mode of the created file.
390 filename the file name
391 options the fopen() options
392 mode the required mode
394 Returns: the fopened FILE or NULL
398 modefopen(uschar *filename, char *options, mode_t mode)
400 mode_t saved_umask = umask(0777);
401 FILE *f = Ufopen(filename, options);
402 (void)umask(saved_umask);
403 if (f != NULL) (void)fchmod(fileno(f), mode);
410 /*************************************************
411 * Ensure stdin, stdout, and stderr exist *
412 *************************************************/
414 /* Some operating systems grumble if an exec() happens without a standard
415 input, output, and error (fds 0, 1, 2) being defined. The worry is that some
416 file will be opened and will use these fd values, and then some other bit of
417 code will assume, for example, that it can write error messages to stderr.
418 This function ensures that fds 0, 1, and 2 are open if they do not already
419 exist, by connecting them to /dev/null.
421 This function is also used to ensure that std{in,out,err} exist at all times,
422 so that if any library that Exim calls tries to use them, it doesn't crash.
434 for (i = 0; i <= 2; i++)
436 if (fstat(i, &statbuf) < 0 && errno == EBADF)
438 if (devnull < 0) devnull = open("/dev/null", O_RDWR);
439 if (devnull < 0) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "%s",
440 string_open_failed(errno, "/dev/null"));
441 if (devnull != i) (void)dup2(devnull, i);
444 if (devnull > 2) (void)close(devnull);
450 /*************************************************
451 * Close unwanted file descriptors for delivery *
452 *************************************************/
454 /* This function is called from a new process that has been forked to deliver
455 an incoming message, either directly, or using exec.
457 We want any smtp input streams to be closed in this new process. However, it
458 has been observed that using fclose() here causes trouble. When reading in -bS
459 input, duplicate copies of messages have been seen. The files will be sharing a
460 file pointer with the parent process, and it seems that fclose() (at least on
461 some systems - I saw this on Solaris 2.5.1) messes with that file pointer, at
462 least sometimes. Hence we go for closing the underlying file descriptors.
464 If TLS is active, we want to shut down the TLS library, but without molesting
465 the parent's SSL connection.
467 For delivery of a non-SMTP message, we want to close stdin and stdout (and
468 stderr unless debugging) because the calling process might have set them up as
469 pipes and be waiting for them to close before it waits for the submission
470 process to terminate. If they aren't closed, they hold up the calling process
471 until the initial delivery process finishes, which is not what we want.
473 Exception: We do want it for synchronous delivery!
475 And notwithstanding all the above, if D_resolver is set, implying resolver
476 debugging, leave stdout open, because that's where the resolver writes its
479 When we close stderr (which implies we've also closed stdout), we also get rid
480 of any controlling terminal.
492 tls_close(FALSE); /* Shut down the TLS library */
494 (void)close(fileno(smtp_in));
495 (void)close(fileno(smtp_out));
500 (void)close(0); /* stdin */
501 if ((debug_selector & D_resolver) == 0) (void)close(1); /* stdout */
502 if (debug_selector == 0) /* stderr */
504 if (!synchronous_delivery)
517 /*************************************************
519 *************************************************/
521 /* This function sets a new uid and gid permanently, optionally calling
522 initgroups() to set auxiliary groups. There are some special cases when running
523 Exim in unprivileged modes. In these situations the effective uid will not be
524 root; if we already have the right effective uid/gid, and don't need to
525 initialize any groups, leave things as they are.
530 igflag TRUE if initgroups() wanted
531 msg text to use in debugging output and failure log
533 Returns: nothing; bombs out on failure
537 exim_setugid(uid_t uid, gid_t gid, BOOL igflag, uschar *msg)
539 uid_t euid = geteuid();
540 gid_t egid = getegid();
542 if (euid == root_uid || euid != uid || egid != gid || igflag)
544 /* At least one OS returns +1 for initgroups failure, so just check for
549 struct passwd *pw = getpwuid(uid);
552 if (initgroups(pw->pw_name, gid) != 0)
553 log_write(0,LOG_MAIN|LOG_PANIC_DIE,"initgroups failed for uid=%ld: %s",
554 (long int)uid, strerror(errno));
556 else log_write(0, LOG_MAIN|LOG_PANIC_DIE, "cannot run initgroups(): "
557 "no passwd entry for uid=%ld", (long int)uid);
560 if (setgid(gid) < 0 || setuid(uid) < 0)
562 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "unable to set gid=%ld or uid=%ld "
563 "(euid=%ld): %s", (long int)gid, (long int)uid, (long int)euid, msg);
567 /* Debugging output included uid/gid and all groups */
572 gid_t group_list[NGROUPS_MAX];
573 debug_printf("changed uid/gid: %s\n uid=%ld gid=%ld pid=%ld\n", msg,
574 (long int)geteuid(), (long int)getegid(), (long int)getpid());
575 group_count = getgroups(NGROUPS_MAX, group_list);
576 debug_printf(" auxiliary group list:");
580 for (i = 0; i < group_count; i++) debug_printf(" %d", (int)group_list[i]);
582 else debug_printf(" <none>");
590 /*************************************************
592 *************************************************/
594 /* Exim exits via this function so that it always clears up any open
600 Returns: does not return
608 debug_printf(">>>>>>>>>>>>>>>> Exim pid=%d terminating with rc=%d "
609 ">>>>>>>>>>>>>>>>\n", (int)getpid(), rc);
616 /*************************************************
617 * Extract port from host address *
618 *************************************************/
620 /* Called to extract the port from the values given to -oMa and -oMi.
621 It also checks the syntax of the address, and terminates it before the
622 port data when a port is extracted.
625 address the address, with possible port on the end
627 Returns: the port, or zero if there isn't one
628 bombs out on a syntax error
632 check_port(uschar *address)
634 int port = host_address_extract_port(address);
635 if (string_is_ip_address(address, NULL) == 0)
637 fprintf(stderr, "exim abandoned: \"%s\" is not an IP address\n", address);
645 /*************************************************
646 * Test/verify an address *
647 *************************************************/
649 /* This function is called by the -bv and -bt code. It extracts a working
650 address from a full RFC 822 address. This isn't really necessary per se, but it
651 has the effect of collapsing source routes.
655 flags flag bits for verify_address()
656 exit_value to be set for failures
662 test_address(uschar *s, int flags, int *exit_value)
664 int start, end, domain;
665 uschar *parse_error = NULL;
666 uschar *address = parse_extract_address(s, &parse_error, &start, &end, &domain,
670 fprintf(stdout, "syntax error: %s\n", parse_error);
675 int rc = verify_address(deliver_make_addr(address,TRUE), stdout, flags, -1,
676 -1, -1, NULL, NULL, NULL);
677 if (rc == FAIL) *exit_value = 2;
678 else if (rc == DEFER && *exit_value == 0) *exit_value = 1;
684 /*************************************************
685 * Decode bit settings for log/debug *
686 *************************************************/
688 /* This function decodes a string containing bit settings in the form of +name
689 and/or -name sequences, and sets/unsets bits in a bit string accordingly. It
690 also recognizes a numeric setting of the form =<number>, but this is not
691 intended for user use. It's an easy way for Exim to pass the debug settings
692 when it is re-exec'ed.
694 The log options are held in two unsigned ints (because there became too many
695 for one). The top bit in the table means "put in 2nd selector". This does not
696 yet apply to debug options, so the "=" facility sets only the first selector.
698 The "all" selector, which must be equal to 0xffffffff, is recognized specially.
699 It sets all the bits in both selectors. However, there is a facility for then
700 unsetting certain bits, because we want to turn off "memory" in the debug case.
702 A bad value for a debug setting is treated as an unknown option - error message
703 to stderr and die. For log settings, which come from the configuration file,
704 we write to the log on the way out...
707 selector1 address of the first bit string
708 selector2 address of the second bit string, or NULL
709 notall1 bits to exclude from "all" for selector1
710 notall2 bits to exclude from "all" for selector2
711 string the configured string
712 options the table of option names
714 which "log" or "debug"
716 Returns: nothing on success - bomb out on failure
720 decode_bits(unsigned int *selector1, unsigned int *selector2, int notall1,
721 int notall2, uschar *string, bit_table *options, int count, uschar *which)
724 if (string == NULL) return;
728 char *end; /* Not uschar */
729 *selector1 = strtoul(CS string+1, &end, 0);
730 if (*end == 0) return;
731 errmsg = string_sprintf("malformed numeric %s_selector setting: %s", which,
736 /* Handle symbolic setting */
743 bit_table *start, *end;
745 while (isspace(*string)) string++;
746 if (*string == 0) return;
748 if (*string != '+' && *string != '-')
750 errmsg = string_sprintf("malformed %s_selector setting: "
751 "+ or - expected but found \"%s\"", which, string);
755 adding = *string++ == '+';
757 while (isalnum(*string) || *string == '_') string++;
761 end = options + count;
765 bit_table *middle = start + (end - start)/2;
766 int c = Ustrncmp(s, middle->name, len);
769 if (middle->name[len] != 0) c = -1; else
771 unsigned int bit = middle->bit;
772 unsigned int *selector;
774 /* The value with all bits set means "force all bits in both selectors"
775 in the case where two are being handled. However, the top bit in the
776 second selector is never set. When setting, some bits can be excluded.
779 if (bit == 0xffffffff)
783 *selector1 = 0xffffffff ^ notall1;
784 if (selector2 != NULL) *selector2 = 0x7fffffff ^ notall2;
789 if (selector2 != NULL) *selector2 = 0;
793 /* Otherwise, the 0x80000000 bit means "this value, without the top
794 bit, belongs in the second selector". */
798 if ((bit & 0x80000000) != 0)
800 selector = selector2;
803 else selector = selector1;
804 if (adding) *selector |= bit; else *selector &= ~bit;
806 break; /* Out of loop to match selector name */
809 if (c < 0) end = middle; else start = middle + 1;
810 } /* Loop to match selector name */
814 errmsg = string_sprintf("unknown %s_selector setting: %c%.*s", which,
815 adding? '+' : '-', len, s);
818 } /* Loop for selector names */
820 /* Handle disasters */
823 if (Ustrcmp(which, "debug") == 0)
825 fprintf(stderr, "exim: %s\n", errmsg);
828 else log_write(0, LOG_CONFIG|LOG_PANIC_DIE, "%s", errmsg);
833 /*************************************************
834 * Show supported features *
835 *************************************************/
837 /* This function is called for -bV and for -d to output the optional features
838 of the current Exim binary.
840 Arguments: a FILE for printing
845 show_whats_supported(FILE *f)
847 #ifdef DB_VERSION_STRING
848 fprintf(f, "Berkeley DB: %s\n", DB_VERSION_STRING);
849 #elif defined(BTREEVERSION) && defined(HASHVERSION)
851 fprintf(f, "Probably Berkeley DB version 1.8x (native mode)\n");
853 fprintf(f, "Probably Berkeley DB version 1.8x (compatibility mode)\n");
855 #elif defined(_DBM_RDONLY) || defined(dbm_dirfno)
856 fprintf(f, "Probably ndbm\n");
857 #elif defined(USE_TDB)
858 fprintf(f, "Using tdb\n");
861 fprintf(f, "Probably GDBM (native mode)\n");
863 fprintf(f, "Probably GDBM (compatibility mode)\n");
867 fprintf(f, "Support for:");
868 #ifdef SUPPORT_CRYPTEQ
869 fprintf(f, " crypteq");
872 fprintf(f, " iconv()");
877 #ifdef HAVE_SETCLASSRESOURCES
878 fprintf(f, " use_setclassresources");
887 fprintf(f, " Expand_dlfunc");
889 #ifdef USE_TCP_WRAPPERS
890 fprintf(f, " TCPwrappers");
894 fprintf(f, " GnuTLS");
896 fprintf(f, " OpenSSL");
899 #ifdef SUPPORT_TRANSLATE_IP_ADDRESS
900 fprintf(f, " translate_ip_address");
902 #ifdef SUPPORT_MOVE_FROZEN_MESSAGES
903 fprintf(f, " move_frozen_messages");
905 #ifdef WITH_CONTENT_SCAN
906 fprintf(f, " Content_Scanning");
908 #ifdef WITH_OLD_DEMIME
909 fprintf(f, " Old_Demime");
911 #ifdef EXPERIMENTAL_SPF
912 fprintf(f, " Experimental_SPF");
914 #ifdef EXPERIMENTAL_SRS
915 fprintf(f, " Experimental_SRS");
917 #ifdef EXPERIMENTAL_BRIGHTMAIL
918 fprintf(f, " Experimental_Brightmail");
920 #ifdef EXPERIMENTAL_DOMAINKEYS
921 fprintf(f, " Experimental_DomainKeys");
923 #ifdef EXPERIMENTAL_DKIM
924 fprintf(f, " Experimental_DKIM");
926 #ifdef EXPERIMENTAL_DCC
927 fprintf(f, " Experimental_DCC");
931 fprintf(f, "Lookups:");
932 #ifdef LOOKUP_LSEARCH
933 fprintf(f, " lsearch wildlsearch nwildlsearch iplsearch");
939 fprintf(f, " dbm dbmnz");
942 fprintf(f, " dnsdb");
944 #ifdef LOOKUP_DSEARCH
945 fprintf(f, " dsearch");
948 fprintf(f, " ibase");
951 fprintf(f, " ldap ldapdn ldapm");
954 fprintf(f, " mysql");
957 fprintf(f, " nis nis0");
959 #ifdef LOOKUP_NISPLUS
960 fprintf(f, " nisplus");
963 fprintf(f, " oracle");
966 fprintf(f, " passwd");
969 fprintf(f, " pgsql");
972 fprintf(f, " sqlite");
975 fprintf(f, " testdb");
978 fprintf(f, " whoson");
982 fprintf(f, "Authenticators:");
984 fprintf(f, " cram_md5");
986 #ifdef AUTH_CYRUS_SASL
987 fprintf(f, " cyrus_sasl");
990 fprintf(f, " dovecot");
992 #ifdef AUTH_PLAINTEXT
993 fprintf(f, " plaintext");
1000 fprintf(f, "Routers:");
1001 #ifdef ROUTER_ACCEPT
1002 fprintf(f, " accept");
1004 #ifdef ROUTER_DNSLOOKUP
1005 fprintf(f, " dnslookup");
1007 #ifdef ROUTER_IPLITERAL
1008 fprintf(f, " ipliteral");
1010 #ifdef ROUTER_IPLOOKUP
1011 fprintf(f, " iplookup");
1013 #ifdef ROUTER_MANUALROUTE
1014 fprintf(f, " manualroute");
1016 #ifdef ROUTER_QUERYPROGRAM
1017 fprintf(f, " queryprogram");
1019 #ifdef ROUTER_REDIRECT
1020 fprintf(f, " redirect");
1024 fprintf(f, "Transports:");
1025 #ifdef TRANSPORT_APPENDFILE
1026 fprintf(f, " appendfile");
1027 #ifdef SUPPORT_MAILDIR
1028 fprintf(f, "/maildir");
1030 #ifdef SUPPORT_MAILSTORE
1031 fprintf(f, "/mailstore");
1037 #ifdef TRANSPORT_AUTOREPLY
1038 fprintf(f, " autoreply");
1040 #ifdef TRANSPORT_LMTP
1041 fprintf(f, " lmtp");
1043 #ifdef TRANSPORT_PIPE
1044 fprintf(f, " pipe");
1046 #ifdef TRANSPORT_SMTP
1047 fprintf(f, " smtp");
1051 if (fixed_never_users[0] > 0)
1054 fprintf(f, "Fixed never_users: ");
1055 for (i = 1; i <= (int)fixed_never_users[0] - 1; i++)
1056 fprintf(f, "%d:", (unsigned int)fixed_never_users[i]);
1057 fprintf(f, "%d\n", (unsigned int)fixed_never_users[i]);
1060 fprintf(f, "Size of off_t: %d\n", sizeof(off_t));
1066 /*************************************************
1067 * Quote a local part *
1068 *************************************************/
1070 /* This function is used when a sender address or a From: or Sender: header
1071 line is being created from the caller's login, or from an authenticated_id. It
1072 applies appropriate quoting rules for a local part.
1074 Argument: the local part
1075 Returns: the local part, quoted if necessary
1079 local_part_quote(uschar *lpart)
1081 BOOL needs_quote = FALSE;
1086 for (t = lpart; !needs_quote && *t != 0; t++)
1088 needs_quote = !isalnum(*t) && strchr("!#$%&'*+-/=?^_`{|}~", *t) == NULL &&
1089 (*t != '.' || t == lpart || t[1] == 0);
1092 if (!needs_quote) return lpart;
1095 yield = string_cat(NULL, &size, &ptr, US"\"", 1);
1099 uschar *nq = US Ustrpbrk(lpart, "\\\"");
1102 yield = string_cat(yield, &size, &ptr, lpart, Ustrlen(lpart));
1105 yield = string_cat(yield, &size, &ptr, lpart, nq - lpart);
1106 yield = string_cat(yield, &size, &ptr, US"\\", 1);
1107 yield = string_cat(yield, &size, &ptr, nq, 1);
1111 yield = string_cat(yield, &size, &ptr, US"\"", 1);
1119 /*************************************************
1120 * Load readline() functions *
1121 *************************************************/
1123 /* This function is called from testing executions that read data from stdin,
1124 but only when running as the calling user. Currently, only -be does this. The
1125 function loads the readline() function library and passes back the functions.
1126 On some systems, it needs the curses library, so load that too, but try without
1127 it if loading fails. All this functionality has to be requested at build time.
1130 fn_readline_ptr pointer to where to put the readline pointer
1131 fn_addhist_ptr pointer to where to put the addhistory function
1133 Returns: the dlopen handle or NULL on failure
1137 set_readline(char * (**fn_readline_ptr)(char *),
1138 char * (**fn_addhist_ptr)(char *))
1141 void *dlhandle_curses = dlopen("libcurses.so", RTLD_GLOBAL|RTLD_LAZY);
1143 dlhandle = dlopen("libreadline.so", RTLD_GLOBAL|RTLD_NOW);
1144 if (dlhandle_curses != NULL) dlclose(dlhandle_curses);
1146 if (dlhandle != NULL)
1148 *fn_readline_ptr = (char *(*)(char*))dlsym(dlhandle, "readline");
1149 *fn_addhist_ptr = (char *(*)(char*))dlsym(dlhandle, "add_history");
1153 DEBUG(D_any) debug_printf("failed to load readline: %s\n", dlerror());
1162 /*************************************************
1163 * Get a line from stdin for testing things *
1164 *************************************************/
1166 /* This function is called when running tests that can take a number of lines
1167 of input (for example, -be and -bt). It handles continuations and trailing
1168 spaces. And prompting and a blank line output on eof. If readline() is in use,
1169 the arguments are non-NULL and provide the relevant functions.
1172 fn_readline readline function or NULL
1173 fn_addhist addhist function or NULL
1175 Returns: pointer to dynamic memory, or NULL at end of file
1179 get_stdinput(char *(*fn_readline)(char *), char *(*fn_addhist)(char *))
1184 uschar *yield = NULL;
1186 if (fn_readline == NULL) { printf("> "); fflush(stdout); }
1190 uschar buffer[1024];
1194 char *readline_line = NULL;
1195 if (fn_readline != NULL)
1197 if ((readline_line = fn_readline((i > 0)? "":"> ")) == NULL) break;
1198 if (*readline_line != 0 && fn_addhist != NULL) fn_addhist(readline_line);
1199 p = US readline_line;
1204 /* readline() not in use */
1207 if (Ufgets(buffer, sizeof(buffer), stdin) == NULL) break;
1211 /* Handle the line */
1213 ss = p + (int)Ustrlen(p);
1214 while (ss > p && isspace(ss[-1])) ss--;
1218 while (p < ss && isspace(*p)) p++; /* leading space after cont */
1221 yield = string_cat(yield, &size, &ptr, p, ss - p);
1224 if (fn_readline != NULL) free(readline_line);
1227 if (ss == p || yield[ptr-1] != '\\')
1235 if (yield == NULL) printf("\n");
1241 /*************************************************
1242 * Output usage information for the program *
1243 *************************************************/
1245 /* This function is called when there are no recipients
1246 or a specific --help argument was added.
1249 progname information on what name we were called by
1251 Returns: DOES NOT RETURN
1255 exim_usage(uschar *progname)
1258 /* Handle specific program invocation varients */
1259 if (Ustrcmp(progname, US"-mailq") == 0)
1262 "mailq - list the contents of the mail queue\n\n",
1263 "For a list of options, see the Exim documentation.\n");
1267 /* Generic usage - we output this whatever happens */
1269 "Exim is a Mail Transfer Agent. It is normally called by Mail User Agents,\n"
1270 "not directly from a shell command line. Options and/or arguments control\n"
1271 "what it does when called. For a list of options, see the Exim documentation.\n");
1278 /*************************************************
1279 * Entry point and high-level code *
1280 *************************************************/
1282 /* Entry point for the Exim mailer. Analyse the arguments and arrange to take
1283 the appropriate action. All the necessary functions are present in the one
1284 binary. I originally thought one should split it up, but it turns out that so
1285 much of the apparatus is needed in each chunk that one might as well just have
1286 it all available all the time, which then makes the coding easier as well.
1289 argc count of entries in argv
1290 argv argument strings, with argv[0] being the program name
1292 Returns: EXIT_SUCCESS if terminated successfully
1293 EXIT_FAILURE otherwise, except when a message has been sent
1294 to the sender, and -oee was given
1298 main(int argc, char **cargv)
1300 uschar **argv = USS cargv;
1301 int arg_receive_timeout = -1;
1302 int arg_smtp_receive_timeout = -1;
1303 int arg_error_handling = error_handling;
1304 int filter_sfd = -1;
1305 int filter_ufd = -1;
1308 int list_queue_option = 0;
1310 int msg_action_arg = -1;
1311 int namelen = (argv[0] == NULL)? 0 : Ustrlen(argv[0]);
1312 int queue_only_reason = 0;
1314 int perl_start_option = 0;
1316 int recipients_arg = argc;
1317 int sender_address_domain = 0;
1318 int test_retry_arg = -1;
1319 int test_rewrite_arg = -1;
1320 BOOL arg_queue_only = FALSE;
1321 BOOL bi_option = FALSE;
1322 BOOL checking = FALSE;
1323 BOOL count_queue = FALSE;
1324 BOOL expansion_test = FALSE;
1325 BOOL extract_recipients = FALSE;
1326 BOOL forced_delivery = FALSE;
1327 BOOL f_end_dot = FALSE;
1328 BOOL deliver_give_up = FALSE;
1329 BOOL list_queue = FALSE;
1330 BOOL list_options = FALSE;
1331 BOOL local_queue_only;
1333 BOOL one_msg_action = FALSE;
1334 BOOL queue_only_set = FALSE;
1335 BOOL receiving_message = TRUE;
1336 BOOL sender_ident_set = FALSE;
1337 BOOL session_local_queue_only;
1339 BOOL removed_privilege = FALSE;
1340 BOOL usage_wanted = FALSE;
1341 BOOL verify_address_mode = FALSE;
1342 BOOL verify_as_sender = FALSE;
1343 BOOL version_printed = FALSE;
1344 uschar *alias_arg = NULL;
1345 uschar *called_as = US"";
1346 uschar *start_queue_run_id = NULL;
1347 uschar *stop_queue_run_id = NULL;
1348 uschar *expansion_test_message = NULL;
1349 uschar *ftest_domain = NULL;
1350 uschar *ftest_localpart = NULL;
1351 uschar *ftest_prefix = NULL;
1352 uschar *ftest_suffix = NULL;
1353 uschar *real_sender_address;
1354 uschar *originator_home = US"/";
1358 struct stat statbuf;
1359 pid_t passed_qr_pid = (pid_t)0;
1360 int passed_qr_pipe = -1;
1361 gid_t group_list[NGROUPS_MAX];
1363 /* Possible options for -R and -S */
1365 static uschar *rsopts[] = { US"f", US"ff", US"r", US"rf", US"rff" };
1367 /* Need to define this in case we need to change the environment in order
1368 to get rid of a bogus time zone. We have to make it char rather than uschar
1369 because some OS define it in /usr/include/unistd.h. */
1371 extern char **environ;
1373 /* If the Exim user and/or group and/or the configuration file owner/group were
1374 defined by ref:name at build time, we must now find the actual uid/gid values.
1375 This is a feature to make the lives of binary distributors easier. */
1377 #ifdef EXIM_USERNAME
1378 if (route_finduser(US EXIM_USERNAME, &pw, &exim_uid))
1380 exim_gid = pw->pw_gid;
1384 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1390 #ifdef EXIM_GROUPNAME
1391 if (!route_findgroup(US EXIM_GROUPNAME, &exim_gid))
1393 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1399 #ifdef CONFIGURE_OWNERNAME
1400 if (!route_finduser(US CONFIGURE_OWNERNAME, NULL, &config_uid))
1402 fprintf(stderr, "exim: failed to find uid for user name \"%s\"\n",
1403 CONFIGURE_OWNERNAME);
1408 #ifdef CONFIGURE_GROUPNAME
1409 if (!route_findgroup(US CONFIGURE_GROUPNAME, &config_gid))
1411 fprintf(stderr, "exim: failed to find gid for group name \"%s\"\n",
1412 CONFIGURE_GROUPNAME);
1417 /* In the Cygwin environment, some initialization needs doing. It is fudged
1418 in by means of this macro. */
1424 /* Check a field which is patched when we are running Exim within its
1425 testing harness; do a fast initial check, and then the whole thing. */
1427 running_in_test_harness =
1428 *running_status == '<' && Ustrcmp(running_status, "<<<testing>>>") == 0;
1430 /* The C standard says that the equivalent of setlocale(LC_ALL, "C") is obeyed
1431 at the start of a program; however, it seems that some environments do not
1432 follow this. A "strange" locale can affect the formatting of timestamps, so we
1435 setlocale(LC_ALL, "C");
1437 /* Set up the default handler for timing using alarm(). */
1439 os_non_restarting_signal(SIGALRM, sigalrm_handler);
1441 /* Ensure we have a buffer for constructing log entries. Use malloc directly,
1442 because store_malloc writes a log entry on failure. */
1444 log_buffer = (uschar *)malloc(LOG_BUFFER_SIZE);
1445 if (log_buffer == NULL)
1447 fprintf(stderr, "exim: failed to get store for log buffer\n");
1451 /* Set log_stderr to stderr, provided that stderr exists. This gets reset to
1452 NULL when the daemon is run and the file is closed. We have to use this
1453 indirection, because some systems don't allow writing to the variable "stderr".
1456 if (fstat(fileno(stderr), &statbuf) >= 0) log_stderr = stderr;
1458 /* Arrange for the PCRE regex library to use our store functions. Note that
1459 the normal calls are actually macros that add additional arguments for
1460 debugging purposes so we have to assign specially constructed functions here.
1461 The default is to use store in the stacking pool, but this is overridden in the
1462 regex_must_compile() function. */
1464 pcre_malloc = function_store_get;
1465 pcre_free = function_dummy_free;
1467 /* Ensure there is a big buffer for temporary use in several places. It is put
1468 in malloc store so that it can be freed for enlargement if necessary. */
1470 big_buffer = store_malloc(big_buffer_size);
1472 /* Set up the handler for the data request signal, and set the initial
1473 descriptive text. */
1475 set_process_info("initializing");
1476 os_restarting_signal(SIGUSR1, usr1_handler);
1478 /* SIGHUP is used to get the daemon to reconfigure. It gets set as appropriate
1479 in the daemon code. For the rest of Exim's uses, we ignore it. */
1481 signal(SIGHUP, SIG_IGN);
1483 /* We don't want to die on pipe errors as the code is written to handle
1484 the write error instead. */
1486 signal(SIGPIPE, SIG_IGN);
1488 /* Under some circumstance on some OS, Exim can get called with SIGCHLD
1489 set to SIG_IGN. This causes subprocesses that complete before the parent
1490 process waits for them not to hang around, so when Exim calls wait(), nothing
1491 is there. The wait() code has been made robust against this, but let's ensure
1492 that SIGCHLD is set to SIG_DFL, because it's tidier to wait and get a process
1493 ending status. We use sigaction rather than plain signal() on those OS where
1494 SA_NOCLDWAIT exists, because we want to be sure it is turned off. (There was a
1495 problem on AIX with this.) */
1499 struct sigaction act;
1500 act.sa_handler = SIG_DFL;
1501 sigemptyset(&(act.sa_mask));
1503 sigaction(SIGCHLD, &act, NULL);
1506 signal(SIGCHLD, SIG_DFL);
1509 /* Save the arguments for use if we re-exec exim as a daemon after receiving
1514 /* Set up the version number. Set up the leading 'E' for the external form of
1515 message ids, set the pointer to the internal form, and initialize it to
1516 indicate no message being processed. */
1519 message_id_option[0] = '-';
1520 message_id_external = message_id_option + 1;
1521 message_id_external[0] = 'E';
1522 message_id = message_id_external + 1;
1525 /* Set the umask to zero so that any files Exim creates using open() are
1526 created with the modes that it specifies. NOTE: Files created with fopen() have
1527 a problem, which was not recognized till rather late (February 2006). With this
1528 umask, such files will be world writeable. (They are all content scanning files
1529 in the spool directory, which isn't world-accessible, so this is not a
1530 disaster, but it's untidy.) I don't want to change this overall setting,
1531 however, because it will interact badly with the open() calls. Instead, there's
1532 now a function called modefopen() that fiddles with the umask while calling
1537 /* Precompile the regular expression for matching a message id. Keep this in
1538 step with the code that generates ids in the accept.c module. We need to do
1539 this here, because the -M options check their arguments for syntactic validity
1540 using mac_ismsgid, which uses this. */
1543 regex_must_compile(US"^(?:[^\\W_]{6}-){2}[^\\W_]{2}$", FALSE, TRUE);
1545 /* Precompile the regular expression that is used for matching an SMTP error
1546 code, possibly extended, at the start of an error message. Note that the
1547 terminating whitespace character is included. */
1550 regex_must_compile(US"^\\d\\d\\d\\s(?:\\d\\.\\d\\d?\\d?\\.\\d\\d?\\d?\\s)?",
1553 /* If the program is called as "mailq" treat it as equivalent to "exim -bp";
1554 this seems to be a generally accepted convention, since one finds symbolic
1555 links called "mailq" in standard OS configurations. */
1557 if ((namelen == 5 && Ustrcmp(argv[0], "mailq") == 0) ||
1558 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/mailq", 6) == 0))
1561 receiving_message = FALSE;
1562 called_as = US"-mailq";
1565 /* If the program is called as "rmail" treat it as equivalent to
1566 "exim -i -oee", thus allowing UUCP messages to be input using non-SMTP mode,
1567 i.e. preventing a single dot on a line from terminating the message, and
1568 returning with zero return code, even in cases of error (provided an error
1569 message has been sent). */
1571 if ((namelen == 5 && Ustrcmp(argv[0], "rmail") == 0) ||
1572 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rmail", 6) == 0))
1575 called_as = US"-rmail";
1576 errors_sender_rc = EXIT_SUCCESS;
1579 /* If the program is called as "rsmtp" treat it as equivalent to "exim -bS";
1580 this is a smail convention. */
1582 if ((namelen == 5 && Ustrcmp(argv[0], "rsmtp") == 0) ||
1583 (namelen > 5 && Ustrncmp(argv[0] + namelen - 6, "/rsmtp", 6) == 0))
1585 smtp_input = smtp_batched_input = TRUE;
1586 called_as = US"-rsmtp";
1589 /* If the program is called as "runq" treat it as equivalent to "exim -q";
1590 this is a smail convention. */
1592 if ((namelen == 4 && Ustrcmp(argv[0], "runq") == 0) ||
1593 (namelen > 4 && Ustrncmp(argv[0] + namelen - 5, "/runq", 5) == 0))
1596 receiving_message = FALSE;
1597 called_as = US"-runq";
1600 /* If the program is called as "newaliases" treat it as equivalent to
1601 "exim -bi"; this is a sendmail convention. */
1603 if ((namelen == 10 && Ustrcmp(argv[0], "newaliases") == 0) ||
1604 (namelen > 10 && Ustrncmp(argv[0] + namelen - 11, "/newaliases", 11) == 0))
1607 receiving_message = FALSE;
1608 called_as = US"-newaliases";
1611 /* Save the original effective uid for a couple of uses later. It should
1612 normally be root, but in some esoteric environments it may not be. */
1614 original_euid = geteuid();
1616 /* Get the real uid and gid. If the caller is root, force the effective uid/gid
1617 to be the same as the real ones. This makes a difference only if Exim is setuid
1618 (or setgid) to something other than root, which could be the case in some
1619 special configurations. */
1621 real_uid = getuid();
1622 real_gid = getgid();
1624 if (real_uid == root_uid)
1630 /* If neither the original real uid nor the original euid was root, Exim is
1631 running in an unprivileged state. */
1633 unprivileged = (real_uid != root_uid && original_euid != root_uid);
1635 /* If the first argument is --help, set usage_wanted and pretend there
1636 are no arguments. This will cause a brief message to be given. We do
1637 the message generation downstream so we can pick up how we were invoked */
1639 if (argc > 1 && Ustrcmp(argv[1], "--help") == 0)
1642 usage_wanted = TRUE;
1645 /* Scan the program's arguments. Some can be dealt with right away; others are
1646 simply recorded for checking and handling afterwards. Do a high-level switch
1647 on the second character (the one after '-'), to save some effort. */
1649 for (i = 1; i < argc; i++)
1651 BOOL badarg = FALSE;
1652 uschar *arg = argv[i];
1656 /* An argument not starting with '-' is the start of a recipients list;
1657 break out of the options-scanning loop. */
1665 /* An option consistion of -- terminates the options */
1667 if (Ustrcmp(arg, "--") == 0)
1669 recipients_arg = i + 1;
1673 /* Handle flagged options */
1675 switchchar = arg[1];
1678 /* Make all -ex options synonymous with -oex arguments, since that
1679 is assumed by various callers. Also make -qR options synonymous with -R
1680 options, as that seems to be required as well. Allow for -qqR too, and
1681 the same for -S options. */
1683 if (Ustrncmp(arg+1, "oe", 2) == 0 ||
1684 Ustrncmp(arg+1, "qR", 2) == 0 ||
1685 Ustrncmp(arg+1, "qS", 2) == 0)
1687 switchchar = arg[2];
1690 else if (Ustrncmp(arg+1, "qqR", 3) == 0 || Ustrncmp(arg+1, "qqS", 3) == 0)
1692 switchchar = arg[3];
1694 queue_2stage = TRUE;
1697 /* Make -r synonymous with -f, since it is a documented alias */
1699 else if (arg[1] == 'r') switchchar = 'f';
1701 /* Make -ov synonymous with -v */
1703 else if (Ustrcmp(arg, "-ov") == 0)
1709 /* High-level switch on active initial letter */
1713 /* -Btype is a sendmail option for 7bit/8bit setting. Exim is 8-bit clean
1714 so has no need of it. */
1717 if (*argrest == 0) i++; /* Skip over the type */
1722 receiving_message = FALSE; /* Reset TRUE for -bm, -bS, -bs below */
1724 /* -bd: Run in daemon mode, awaiting SMTP connections.
1725 -bdf: Ditto, but in the foreground.
1728 if (*argrest == 'd')
1730 daemon_listen = TRUE;
1731 if (*(++argrest) == 'f') background_daemon = FALSE;
1732 else if (*argrest != 0) { badarg = TRUE; break; }
1735 /* -be: Run in expansion test mode
1736 -bem: Ditto, but read a message from a file first
1739 else if (*argrest == 'e')
1741 expansion_test = checking = TRUE;
1742 if (argrest[1] == 'm')
1744 if (++i >= argc) { badarg = TRUE; break; }
1745 expansion_test_message = argv[i];
1748 if (argrest[1] != 0) { badarg = TRUE; break; }
1751 /* -bF: Run system filter test */
1753 else if (*argrest == 'F')
1755 filter_test |= FTEST_SYSTEM;
1756 if (*(++argrest) != 0) { badarg = TRUE; break; }
1757 if (++i < argc) filter_test_sfile = argv[i]; else
1759 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1764 /* -bf: Run user filter test
1765 -bfd: Set domain for filter testing
1766 -bfl: Set local part for filter testing
1767 -bfp: Set prefix for filter testing
1768 -bfs: Set suffix for filter testing
1771 else if (*argrest == 'f')
1773 if (*(++argrest) == 0)
1775 filter_test |= FTEST_USER;
1776 if (++i < argc) filter_test_ufile = argv[i]; else
1778 fprintf(stderr, "exim: file name expected after %s\n", argv[i-1]);
1786 fprintf(stderr, "exim: string expected after %s\n", arg);
1789 if (Ustrcmp(argrest, "d") == 0) ftest_domain = argv[i];
1790 else if (Ustrcmp(argrest, "l") == 0) ftest_localpart = argv[i];
1791 else if (Ustrcmp(argrest, "p") == 0) ftest_prefix = argv[i];
1792 else if (Ustrcmp(argrest, "s") == 0) ftest_suffix = argv[i];
1793 else { badarg = TRUE; break; }
1797 /* -bh: Host checking - an IP address must follow. */
1799 else if (Ustrcmp(argrest, "h") == 0 || Ustrcmp(argrest, "hc") == 0)
1801 if (++i >= argc) { badarg = TRUE; break; }
1802 sender_host_address = argv[i];
1803 host_checking = checking = log_testing_mode = TRUE;
1804 host_checking_callout = argrest[1] == 'c';
1807 /* -bi: This option is used by sendmail to initialize *the* alias file,
1808 though it has the -oA option to specify a different file. Exim has no
1809 concept of *the* alias file, but since Sun's YP make script calls
1810 sendmail this way, some support must be provided. */
1812 else if (Ustrcmp(argrest, "i") == 0) bi_option = TRUE;
1814 /* -bm: Accept and deliver message - the default option. Reinstate
1815 receiving_message, which got turned off for all -b options. */
1817 else if (Ustrcmp(argrest, "m") == 0) receiving_message = TRUE;
1819 /* -bnq: For locally originating messages, do not qualify unqualified
1820 addresses. In the envelope, this causes errors; in header lines they
1823 else if (Ustrcmp(argrest, "nq") == 0)
1825 allow_unqualified_sender = FALSE;
1826 allow_unqualified_recipient = FALSE;
1829 /* -bpxx: List the contents of the mail queue, in various forms. If
1830 the option is -bpc, just a queue count is needed. Otherwise, if the
1831 first letter after p is r, then order is random. */
1833 else if (*argrest == 'p')
1835 if (*(++argrest) == 'c')
1838 if (*(++argrest) != 0) badarg = TRUE;
1842 if (*argrest == 'r')
1844 list_queue_option = 8;
1847 else list_queue_option = 0;
1851 /* -bp: List the contents of the mail queue, top-level only */
1853 if (*argrest == 0) {}
1855 /* -bpu: List the contents of the mail queue, top-level undelivered */
1857 else if (Ustrcmp(argrest, "u") == 0) list_queue_option += 1;
1859 /* -bpa: List the contents of the mail queue, including all delivered */
1861 else if (Ustrcmp(argrest, "a") == 0) list_queue_option += 2;
1863 /* Unknown after -bp[r] */
1873 /* -bP: List the configuration variables given as the address list.
1874 Force -v, so configuration errors get displayed. */
1876 else if (Ustrcmp(argrest, "P") == 0)
1878 list_options = TRUE;
1879 debug_selector |= D_v;
1880 debug_file = stderr;
1883 /* -brt: Test retry configuration lookup */
1885 else if (Ustrcmp(argrest, "rt") == 0)
1887 test_retry_arg = i + 1;
1891 /* -brw: Test rewrite configuration */
1893 else if (Ustrcmp(argrest, "rw") == 0)
1895 test_rewrite_arg = i + 1;
1899 /* -bS: Read SMTP commands on standard input, but produce no replies -
1900 all errors are reported by sending messages. */
1902 else if (Ustrcmp(argrest, "S") == 0)
1903 smtp_input = smtp_batched_input = receiving_message = TRUE;
1905 /* -bs: Read SMTP commands on standard input and produce SMTP replies
1906 on standard output. */
1908 else if (Ustrcmp(argrest, "s") == 0) smtp_input = receiving_message = TRUE;
1910 /* -bt: address testing mode */
1912 else if (Ustrcmp(argrest, "t") == 0)
1913 address_test_mode = checking = log_testing_mode = TRUE;
1915 /* -bv: verify addresses */
1917 else if (Ustrcmp(argrest, "v") == 0)
1918 verify_address_mode = checking = log_testing_mode = TRUE;
1920 /* -bvs: verify sender addresses */
1922 else if (Ustrcmp(argrest, "vs") == 0)
1924 verify_address_mode = checking = log_testing_mode = TRUE;
1925 verify_as_sender = TRUE;
1928 /* -bV: Print version string and support details */
1930 else if (Ustrcmp(argrest, "V") == 0)
1932 printf("Exim version %s #%s built %s\n", version_string,
1933 version_cnumber, version_date);
1934 printf("%s\n", CS version_copyright);
1935 version_printed = TRUE;
1936 show_whats_supported(stdout);
1943 /* -C: change configuration file list; ignore if it isn't really
1944 a change! Enforce a prefix check if required. */
1949 if(++i < argc) argrest = argv[i]; else
1950 { badarg = TRUE; break; }
1952 if (Ustrcmp(config_main_filelist, argrest) != 0)
1954 #ifdef ALT_CONFIG_PREFIX
1956 int len = Ustrlen(ALT_CONFIG_PREFIX);
1957 uschar *list = argrest;
1959 while((filename = string_nextinlist(&list, &sep, big_buffer,
1960 big_buffer_size)) != NULL)
1962 if ((Ustrlen(filename) < len ||
1963 Ustrncmp(filename, ALT_CONFIG_PREFIX, len) != 0 ||
1964 Ustrstr(filename, "/../") != NULL) &&
1965 (Ustrcmp(filename, "/dev/null") != 0 || real_uid != root_uid))
1967 fprintf(stderr, "-C Permission denied\n");
1973 config_main_filelist = argrest;
1974 config_changed = TRUE;
1979 /* -D: set up a macro definition */
1982 #ifdef DISABLE_D_OPTION
1983 fprintf(stderr, "exim: -D is not available in this Exim binary\n");
1988 macro_item *mlast = NULL;
1991 uschar *s = argrest;
1993 while (isspace(*s)) s++;
1995 if (*s < 'A' || *s > 'Z')
1997 fprintf(stderr, "exim: macro name set by -D must start with "
1998 "an upper case letter\n");
2002 while (isalnum(*s) || *s == '_')
2004 if (ptr < sizeof(name)-1) name[ptr++] = *s;
2008 if (ptr == 0) { badarg = TRUE; break; }
2009 while (isspace(*s)) s++;
2012 if (*s++ != '=') { badarg = TRUE; break; }
2013 while (isspace(*s)) s++;
2016 for (m = macros; m != NULL; m = m->next)
2018 if (Ustrcmp(m->name, name) == 0)
2020 fprintf(stderr, "exim: duplicated -D in command line\n");
2026 m = store_get(sizeof(macro_item) + Ustrlen(name));
2028 m->command_line = TRUE;
2029 if (mlast == NULL) macros = m; else mlast->next = m;
2030 Ustrcpy(m->name, name);
2031 m->replacement = string_copy(s);
2033 if (clmacro_count >= MAX_CLMACROS)
2035 fprintf(stderr, "exim: too many -D options on command line\n");
2038 clmacros[clmacro_count++] = string_sprintf("-D%s=%s", m->name,
2044 /* -d: Set debug level (see also -v below) or set the drop_cr option.
2045 The latter is now a no-op, retained for compatibility only. If -dd is used,
2046 debugging subprocesses of the daemon is disabled. */
2049 if (Ustrcmp(argrest, "ropcr") == 0)
2051 /* drop_cr = TRUE; */
2054 /* Use an intermediate variable so that we don't set debugging while
2055 decoding the debugging bits. */
2059 unsigned int selector = D_default;
2062 if (*argrest == 'd')
2064 debug_daemon = TRUE;
2068 decode_bits(&selector, NULL, D_memory, 0, argrest, debug_options,
2069 debug_options_count, US"debug");
2070 debug_selector = selector;
2075 /* -E: This is a local error message. This option is not intended for
2076 external use at all, but is not restricted to trusted callers because it
2077 does no harm (just suppresses certain error messages) and if Exim is run
2078 not setuid root it won't always be trusted when it generates error
2079 messages using this option. If there is a message id following -E, point
2080 message_reference at it, for logging. */
2083 local_error_message = TRUE;
2084 if (mac_ismsgid(argrest)) message_reference = argrest;
2088 /* -ex: The vacation program calls sendmail with the undocumented "-eq"
2089 option, so it looks as if historically the -oex options are also callable
2090 without the leading -o. So we have to accept them. Before the switch,
2091 anything starting -oe has been converted to -e. Exim does not support all
2092 of the sendmail error options. */
2095 if (Ustrcmp(argrest, "e") == 0)
2097 arg_error_handling = ERRORS_SENDER;
2098 errors_sender_rc = EXIT_SUCCESS;
2100 else if (Ustrcmp(argrest, "m") == 0) arg_error_handling = ERRORS_SENDER;
2101 else if (Ustrcmp(argrest, "p") == 0) arg_error_handling = ERRORS_STDERR;
2102 else if (Ustrcmp(argrest, "q") == 0) arg_error_handling = ERRORS_STDERR;
2103 else if (Ustrcmp(argrest, "w") == 0) arg_error_handling = ERRORS_SENDER;
2108 /* -F: Set sender's full name, used instead of the gecos entry from
2109 the password file. Since users can usually alter their gecos entries,
2110 there's no security involved in using this instead. The data can follow
2111 the -F or be in the next argument. */
2116 if(++i < argc) argrest = argv[i]; else
2117 { badarg = TRUE; break; }
2119 originator_name = argrest;
2120 sender_name_forced = TRUE;
2124 /* -f: Set sender's address - this value is only actually used if Exim is
2125 run by a trusted user, or if untrusted_set_sender is set and matches the
2126 address, except that the null address can always be set by any user. The
2127 test for this happens later, when the value given here is ignored when not
2128 permitted. For an untrusted user, the actual sender is still put in Sender:
2129 if it doesn't match the From: header (unless no_local_from_check is set).
2130 The data can follow the -f or be in the next argument. The -r switch is an
2131 obsolete form of -f but since there appear to be programs out there that
2132 use anything that sendmail has ever supported, better accept it - the
2133 synonymizing is done before the switch above.
2135 At this stage, we must allow domain literal addresses, because we don't
2136 know what the setting of allow_domain_literals is yet. Ditto for trailing
2137 dots and strip_trailing_dot. */
2145 if (i+1 < argc) argrest = argv[++i]; else
2146 { badarg = TRUE; break; }
2150 sender_address = string_sprintf(""); /* Ensure writeable memory */
2154 uschar *temp = argrest + Ustrlen(argrest) - 1;
2155 while (temp >= argrest && isspace(*temp)) temp--;
2156 if (temp >= argrest && *temp == '.') f_end_dot = TRUE;
2157 allow_domain_literals = TRUE;
2158 strip_trailing_dot = TRUE;
2159 sender_address = parse_extract_address(argrest, &errmess, &start, &end,
2160 &sender_address_domain, TRUE);
2161 allow_domain_literals = FALSE;
2162 strip_trailing_dot = FALSE;
2163 if (sender_address == NULL)
2165 fprintf(stderr, "exim: bad -f address \"%s\": %s\n", argrest, errmess);
2166 return EXIT_FAILURE;
2169 sender_address_forced = TRUE;
2173 /* This is some Sendmail thing which can be ignored */
2178 /* -h: Set the hop count for an incoming message. Exim does not currently
2179 support this; it always computes it by counting the Received: headers.
2180 To put it in will require a change to the spool header file format. */
2185 if(++i < argc) argrest = argv[i]; else
2186 { badarg = TRUE; break; }
2188 if (!isdigit(*argrest)) badarg = TRUE;
2192 /* -i: Set flag so dot doesn't end non-SMTP input (same as -oi, seems
2193 not to be documented for sendmail but mailx (at least) uses it) */
2196 if (*argrest == 0) dot_ends = FALSE; else badarg = TRUE;
2201 receiving_message = FALSE;
2203 /* -MC: continue delivery of another message via an existing open
2204 file descriptor. This option is used for an internal call by the
2205 smtp transport when there is a pending message waiting to go to an
2206 address to which it has got a connection. Five subsequent arguments are
2207 required: transport name, host name, IP address, sequence number, and
2208 message_id. Transports may decline to create new processes if the sequence
2209 number gets too big. The channel is stdin. This (-MC) must be the last
2210 argument. There's a subsequent check that the real-uid is privileged.
2212 If we are running in the test harness. delay for a bit, to let the process
2213 that set this one up complete. This makes for repeatability of the logging,
2216 if (Ustrcmp(argrest, "C") == 0)
2218 union sockaddr_46 interface_sock;
2219 EXIM_SOCKLEN_T size = sizeof(interface_sock);
2223 fprintf(stderr, "exim: too many or too few arguments after -MC\n");
2224 return EXIT_FAILURE;
2227 if (msg_action_arg >= 0)
2229 fprintf(stderr, "exim: incompatible arguments\n");
2230 return EXIT_FAILURE;
2233 continue_transport = argv[++i];
2234 continue_hostname = argv[++i];
2235 continue_host_address = argv[++i];
2236 continue_sequence = Uatoi(argv[++i]);
2237 msg_action = MSG_DELIVER;
2238 msg_action_arg = ++i;
2239 forced_delivery = TRUE;
2240 queue_run_pid = passed_qr_pid;
2241 queue_run_pipe = passed_qr_pipe;
2243 if (!mac_ismsgid(argv[i]))
2245 fprintf(stderr, "exim: malformed message id %s after -MC option\n",
2247 return EXIT_FAILURE;
2250 /* Set up $sending_ip_address and $sending_port */
2252 if (getsockname(fileno(stdin), (struct sockaddr *)(&interface_sock),
2254 sending_ip_address = host_ntoa(-1, &interface_sock, NULL,
2258 fprintf(stderr, "exim: getsockname() failed after -MC option: %s\n",
2260 return EXIT_FAILURE;
2263 if (running_in_test_harness) millisleep(500);
2267 /* -MCA: set the smtp_authenticated flag; this is useful only when it
2268 precedes -MC (see above). The flag indicates that the host to which
2269 Exim is connected has accepted an AUTH sequence. */
2271 else if (Ustrcmp(argrest, "CA") == 0)
2273 smtp_authenticated = TRUE;
2277 /* -MCP: set the smtp_use_pipelining flag; this is useful only when
2278 it preceded -MC (see above) */
2280 else if (Ustrcmp(argrest, "CP") == 0)
2282 smtp_use_pipelining = TRUE;
2286 /* -MCQ: pass on the pid of the queue-running process that started
2287 this chain of deliveries and the fd of its synchronizing pipe; this
2288 is useful only when it precedes -MC (see above) */
2290 else if (Ustrcmp(argrest, "CQ") == 0)
2292 if(++i < argc) passed_qr_pid = (pid_t)(Uatol(argv[i]));
2294 if(++i < argc) passed_qr_pipe = (int)(Uatol(argv[i]));
2299 /* -MCS: set the smtp_use_size flag; this is useful only when it
2300 precedes -MC (see above) */
2302 else if (Ustrcmp(argrest, "CS") == 0)
2304 smtp_use_size = TRUE;
2308 /* -MCT: set the tls_offered flag; this is useful only when it
2309 precedes -MC (see above). The flag indicates that the host to which
2310 Exim is connected has offered TLS support. */
2313 else if (Ustrcmp(argrest, "CT") == 0)
2320 /* -M[x]: various operations on the following list of message ids:
2321 -M deliver the messages, ignoring next retry times and thawing
2322 -Mc deliver the messages, checking next retry times, no thawing
2323 -Mf freeze the messages
2324 -Mg give up on the messages
2325 -Mt thaw the messages
2326 -Mrm remove the messages
2327 In the above cases, this must be the last option. There are also the
2328 following options which are followed by a single message id, and which
2329 act on that message. Some of them use the "recipient" addresses as well.
2330 -Mar add recipient(s)
2331 -Mmad mark all recipients delivered
2332 -Mmd mark recipients(s) delivered
2334 -Mset load a message for use with -be
2336 -Mvc show copy (of whole message, in RFC 2822 format)
2341 else if (*argrest == 0)
2343 msg_action = MSG_DELIVER;
2344 forced_delivery = deliver_force_thaw = TRUE;
2346 else if (Ustrcmp(argrest, "ar") == 0)
2348 msg_action = MSG_ADD_RECIPIENT;
2349 one_msg_action = TRUE;
2351 else if (Ustrcmp(argrest, "c") == 0) msg_action = MSG_DELIVER;
2352 else if (Ustrcmp(argrest, "es") == 0)
2354 msg_action = MSG_EDIT_SENDER;
2355 one_msg_action = TRUE;
2357 else if (Ustrcmp(argrest, "f") == 0) msg_action = MSG_FREEZE;
2358 else if (Ustrcmp(argrest, "g") == 0)
2360 msg_action = MSG_DELIVER;
2361 deliver_give_up = TRUE;
2363 else if (Ustrcmp(argrest, "mad") == 0)
2365 msg_action = MSG_MARK_ALL_DELIVERED;
2367 else if (Ustrcmp(argrest, "md") == 0)
2369 msg_action = MSG_MARK_DELIVERED;
2370 one_msg_action = TRUE;
2372 else if (Ustrcmp(argrest, "rm") == 0) msg_action = MSG_REMOVE;
2373 else if (Ustrcmp(argrest, "set") == 0)
2375 msg_action = MSG_LOAD;
2376 one_msg_action = TRUE;
2378 else if (Ustrcmp(argrest, "t") == 0) msg_action = MSG_THAW;
2379 else if (Ustrcmp(argrest, "vb") == 0)
2381 msg_action = MSG_SHOW_BODY;
2382 one_msg_action = TRUE;
2384 else if (Ustrcmp(argrest, "vc") == 0)
2386 msg_action = MSG_SHOW_COPY;
2387 one_msg_action = TRUE;
2389 else if (Ustrcmp(argrest, "vh") == 0)
2391 msg_action = MSG_SHOW_HEADER;
2392 one_msg_action = TRUE;
2394 else if (Ustrcmp(argrest, "vl") == 0)
2396 msg_action = MSG_SHOW_LOG;
2397 one_msg_action = TRUE;
2399 else { badarg = TRUE; break; }
2401 /* All the -Mxx options require at least one message id. */
2403 msg_action_arg = i + 1;
2404 if (msg_action_arg >= argc)
2406 fprintf(stderr, "exim: no message ids given after %s option\n", arg);
2407 return EXIT_FAILURE;
2410 /* Some require only message ids to follow */
2412 if (!one_msg_action)
2415 for (j = msg_action_arg; j < argc; j++) if (!mac_ismsgid(argv[j]))
2417 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2419 return EXIT_FAILURE;
2421 goto END_ARG; /* Remaining args are ids */
2424 /* Others require only one message id, possibly followed by addresses,
2425 which will be handled as normal arguments. */
2429 if (!mac_ismsgid(argv[msg_action_arg]))
2431 fprintf(stderr, "exim: malformed message id %s after %s option\n",
2432 argv[msg_action_arg], arg);
2433 return EXIT_FAILURE;
2440 /* Some programs seem to call the -om option without the leading o;
2441 for sendmail it askes for "me too". Exim always does this. */
2444 if (*argrest != 0) badarg = TRUE;
2448 /* -N: don't do delivery - a debugging option that stops transports doing
2449 their thing. It implies debugging at the D_v level. */
2454 dont_deliver = TRUE;
2455 debug_selector |= D_v;
2456 debug_file = stderr;
2462 /* -n: This means "don't alias" in sendmail, apparently. Just ignore
2468 /* -O: Just ignore it. In sendmail, apparently -O option=value means set
2469 option to the specified value. This form uses long names. We need to handle
2470 -O option=value and -Ooption=value. */
2477 fprintf(stderr, "exim: string expected after -O\n");
2485 /* -oA: Set an argument for the bi command (sendmail's "alternate alias
2488 if (*argrest == 'A')
2490 alias_arg = argrest + 1;
2491 if (alias_arg[0] == 0)
2493 if (i+1 < argc) alias_arg = argv[++i]; else
2495 fprintf(stderr, "exim: string expected after -oA\n");
2501 /* -oB: Set a connection message max value for remote deliveries */
2503 else if (*argrest == 'B')
2505 uschar *p = argrest + 1;
2508 if (i+1 < argc && isdigit((argv[i+1][0]))) p = argv[++i]; else
2510 connection_max_messages = 1;
2519 fprintf(stderr, "exim: number expected after -oB\n");
2522 connection_max_messages = Uatoi(p);
2526 /* -odb: background delivery */
2528 else if (Ustrcmp(argrest, "db") == 0)
2530 synchronous_delivery = FALSE;
2531 arg_queue_only = FALSE;
2532 queue_only_set = TRUE;
2535 /* -odf: foreground delivery (smail-compatible option); same effect as
2536 -odi: interactive (synchronous) delivery (sendmail-compatible option)
2539 else if (Ustrcmp(argrest, "df") == 0 || Ustrcmp(argrest, "di") == 0)
2541 synchronous_delivery = TRUE;
2542 arg_queue_only = FALSE;
2543 queue_only_set = TRUE;
2546 /* -odq: queue only */
2548 else if (Ustrcmp(argrest, "dq") == 0)
2550 synchronous_delivery = FALSE;
2551 arg_queue_only = TRUE;
2552 queue_only_set = TRUE;
2555 /* -odqs: queue SMTP only - do local deliveries and remote routing,
2556 but no remote delivery */
2558 else if (Ustrcmp(argrest, "dqs") == 0)
2561 arg_queue_only = FALSE;
2562 queue_only_set = TRUE;
2565 /* -oex: Sendmail error flags. As these are also accepted without the
2566 leading -o prefix, for compatibility with vacation and other callers,
2567 they are handled with -e above. */
2569 /* -oi: Set flag so dot doesn't end non-SMTP input (same as -i)
2570 -oitrue: Another sendmail syntax for the same */
2572 else if (Ustrcmp(argrest, "i") == 0 ||
2573 Ustrcmp(argrest, "itrue") == 0)
2576 /* -oM*: Set various characteristics for an incoming message; actually
2577 acted on for trusted callers only. */
2579 else if (*argrest == 'M')
2583 fprintf(stderr, "exim: data expected after -o%s\n", argrest);
2587 /* -oMa: Set sender host address */
2589 if (Ustrcmp(argrest, "Ma") == 0) sender_host_address = argv[++i];
2591 /* -oMaa: Set authenticator name */
2593 else if (Ustrcmp(argrest, "Maa") == 0)
2594 sender_host_authenticated = argv[++i];
2596 /* -oMas: setting authenticated sender */
2598 else if (Ustrcmp(argrest, "Mas") == 0) authenticated_sender = argv[++i];
2600 /* -oMai: setting authenticated id */
2602 else if (Ustrcmp(argrest, "Mai") == 0) authenticated_id = argv[++i];
2604 /* -oMi: Set incoming interface address */
2606 else if (Ustrcmp(argrest, "Mi") == 0) interface_address = argv[++i];
2608 /* -oMr: Received protocol */
2610 else if (Ustrcmp(argrest, "Mr") == 0) received_protocol = argv[++i];
2612 /* -oMs: Set sender host name */
2614 else if (Ustrcmp(argrest, "Ms") == 0) sender_host_name = argv[++i];
2616 /* -oMt: Set sender ident */
2618 else if (Ustrcmp(argrest, "Mt") == 0)
2620 sender_ident_set = TRUE;
2621 sender_ident = argv[++i];
2624 /* Else a bad argument */
2633 /* -om: Me-too flag for aliases. Exim always does this. Some programs
2634 seem to call this as -m (undocumented), so that is also accepted (see
2637 else if (Ustrcmp(argrest, "m") == 0) {}
2639 /* -oo: An ancient flag for old-style addresses which still seems to
2640 crop up in some calls (see in SCO). */
2642 else if (Ustrcmp(argrest, "o") == 0) {}
2644 /* -oP <name>: set pid file path for daemon */
2646 else if (Ustrcmp(argrest, "P") == 0)
2647 override_pid_file_path = argv[++i];
2649 /* -or <n>: set timeout for non-SMTP acceptance
2650 -os <n>: set timeout for SMTP acceptance */
2652 else if (*argrest == 'r' || *argrest == 's')
2654 int *tp = (*argrest == 'r')?
2655 &arg_receive_timeout : &arg_smtp_receive_timeout;
2656 if (argrest[1] == 0)
2658 if (i+1 < argc) *tp= readconf_readtime(argv[++i], 0, FALSE);
2660 else *tp = readconf_readtime(argrest + 1, 0, FALSE);
2663 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2668 /* -oX <list>: Override local_interfaces and/or default daemon ports */
2670 else if (Ustrcmp(argrest, "X") == 0)
2671 override_local_interfaces = argv[++i];
2673 /* Unknown -o argument */
2679 /* -ps: force Perl startup; -pd force delayed Perl startup */
2683 if (*argrest == 's' && argrest[1] == 0)
2685 perl_start_option = 1;
2688 if (*argrest == 'd' && argrest[1] == 0)
2690 perl_start_option = -1;
2695 /* -panythingelse is taken as the Sendmail-compatible argument -prval:sval,
2696 which sets the host protocol and host name */
2700 if (i+1 < argc) argrest = argv[++i]; else
2701 { badarg = TRUE; break; }
2706 uschar *hn = Ustrchr(argrest, ':');
2709 received_protocol = argrest;
2713 received_protocol = string_copyn(argrest, hn - argrest);
2714 sender_host_name = hn + 1;
2721 receiving_message = FALSE;
2722 if (queue_interval >= 0)
2724 fprintf(stderr, "exim: -q specified more than once\n");
2728 /* -qq...: Do queue runs in a 2-stage manner */
2730 if (*argrest == 'q')
2732 queue_2stage = TRUE;
2736 /* -qi...: Do only first (initial) deliveries */
2738 if (*argrest == 'i')
2740 queue_run_first_delivery = TRUE;
2744 /* -qf...: Run the queue, forcing deliveries
2745 -qff..: Ditto, forcing thawing as well */
2747 if (*argrest == 'f')
2749 queue_run_force = TRUE;
2750 if (*(++argrest) == 'f')
2752 deliver_force_thaw = TRUE;
2757 /* -q[f][f]l...: Run the queue only on local deliveries */
2759 if (*argrest == 'l')
2761 queue_run_local = TRUE;
2765 /* -q[f][f][l]: Run the queue, optionally forced, optionally local only,
2766 optionally starting from a given message id. */
2768 if (*argrest == 0 &&
2769 (i + 1 >= argc || argv[i+1][0] == '-' || mac_ismsgid(argv[i+1])))
2772 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2773 start_queue_run_id = argv[++i];
2774 if (i+1 < argc && mac_ismsgid(argv[i+1]))
2775 stop_queue_run_id = argv[++i];
2778 /* -q[f][f][l]<n>: Run the queue at regular intervals, optionally forced,
2779 optionally local only. */
2784 queue_interval = readconf_readtime(argrest, 0, FALSE);
2786 queue_interval = readconf_readtime(argv[++i], 0, FALSE);
2787 if (queue_interval <= 0)
2789 fprintf(stderr, "exim: bad time value %s: abandoned\n", argv[i]);
2796 case 'R': /* Synonymous with -qR... */
2797 receiving_message = FALSE;
2799 /* -Rf: As -R (below) but force all deliveries,
2800 -Rff: Ditto, but also thaw all frozen messages,
2801 -Rr: String is regex
2802 -Rrf: Regex and force
2803 -Rrff: Regex and force and thaw
2805 in all cases provided there are no further characters in this
2811 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2813 if (Ustrcmp(argrest, rsopts[i]) == 0)
2815 if (i != 2) queue_run_force = TRUE;
2816 if (i >= 2) deliver_selectstring_regex = TRUE;
2817 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2818 argrest += Ustrlen(rsopts[i]);
2823 /* -R: Set string to match in addresses for forced queue run to
2824 pick out particular messages. */
2828 if (i+1 < argc) deliver_selectstring = argv[++i]; else
2830 fprintf(stderr, "exim: string expected after -R\n");
2834 else deliver_selectstring = argrest;
2838 /* -r: an obsolete synonym for -f (see above) */
2841 /* -S: Like -R but works on sender. */
2843 case 'S': /* Synonymous with -qS... */
2844 receiving_message = FALSE;
2846 /* -Sf: As -S (below) but force all deliveries,
2847 -Sff: Ditto, but also thaw all frozen messages,
2848 -Sr: String is regex
2849 -Srf: Regex and force
2850 -Srff: Regex and force and thaw
2852 in all cases provided there are no further characters in this
2858 for (i = 0; i < sizeof(rsopts)/sizeof(uschar *); i++)
2860 if (Ustrcmp(argrest, rsopts[i]) == 0)
2862 if (i != 2) queue_run_force = TRUE;
2863 if (i >= 2) deliver_selectstring_sender_regex = TRUE;
2864 if (i == 1 || i == 4) deliver_force_thaw = TRUE;
2865 argrest += Ustrlen(rsopts[i]);
2870 /* -S: Set string to match in addresses for forced queue run to
2871 pick out particular messages. */
2875 if (i+1 < argc) deliver_selectstring_sender = argv[++i]; else
2877 fprintf(stderr, "exim: string expected after -S\n");
2881 else deliver_selectstring_sender = argrest;
2884 /* -Tqt is an option that is exclusively for use by the testing suite.
2885 It is not recognized in other circumstances. It allows for the setting up
2886 of explicit "queue times" so that various warning/retry things can be
2887 tested. Otherwise variability of clock ticks etc. cause problems. */
2890 if (running_in_test_harness && Ustrcmp(argrest, "qt") == 0)
2891 fudged_queue_times = argv[++i];
2896 /* -t: Set flag to extract recipients from body of message. */
2899 if (*argrest == 0) extract_recipients = TRUE;
2901 /* -ti: Set flag to extract recipients from body of message, and also
2902 specify that dot does not end the message. */
2904 else if (Ustrcmp(argrest, "i") == 0)
2906 extract_recipients = TRUE;
2910 /* -tls-on-connect: don't wait for STARTTLS (for old clients) */
2913 else if (Ustrcmp(argrest, "ls-on-connect") == 0) tls_on_connect = TRUE;
2920 /* -U: This means "initial user submission" in sendmail, apparently. The
2921 doc claims that in future sendmail may refuse syntactically invalid
2922 messages instead of fixing them. For the moment, we just ignore it. */
2928 /* -v: verify things - this is a very low-level debugging */
2933 debug_selector |= D_v;
2934 debug_file = stderr;
2940 /* -x: AIX uses this to indicate some fancy 8-bit character stuff:
2942 The -x flag tells the sendmail command that mail from a local
2943 mail program has National Language Support (NLS) extended characters
2944 in the body of the mail item. The sendmail command can send mail with
2945 extended NLS characters across networks that normally corrupts these
2948 As Exim is 8-bit clean, it just ignores this flag. */
2951 if (*argrest != 0) badarg = TRUE;
2954 /* All other initial characters are errors */
2959 } /* End of high-level switch statement */
2961 /* Failed to recognize the option, or syntax error */
2965 fprintf(stderr, "exim abandoned: unknown, malformed, or incomplete "
2966 "option %s\n", arg);
2972 /* If -R or -S have been specified without -q, assume a single queue run. */
2974 if ((deliver_selectstring != NULL || deliver_selectstring_sender != NULL) &&
2975 queue_interval < 0) queue_interval = 0;
2979 /* If usage_wanted is set we call the usage function - which never returns */
2980 if (usage_wanted) exim_usage(called_as);
2982 /* Arguments have been processed. Check for incompatibilities. */
2984 (smtp_input || extract_recipients || recipients_arg < argc) &&
2985 (daemon_listen || queue_interval >= 0 || bi_option ||
2986 test_retry_arg >= 0 || test_rewrite_arg >= 0 ||
2987 filter_test != FTEST_NONE || (msg_action_arg > 0 && !one_msg_action))
2990 msg_action_arg > 0 &&
2991 (daemon_listen || queue_interval >= 0 || list_options ||
2992 (checking && msg_action != MSG_LOAD) ||
2993 bi_option || test_retry_arg >= 0 || test_rewrite_arg >= 0)
2996 (daemon_listen || queue_interval >= 0) &&
2997 (sender_address != NULL || list_options || list_queue || checking ||
3001 daemon_listen && queue_interval == 0
3005 (checking || smtp_input || extract_recipients ||
3006 filter_test != FTEST_NONE || bi_option)
3009 verify_address_mode &&
3010 (address_test_mode || smtp_input || extract_recipients ||
3011 filter_test != FTEST_NONE || bi_option)
3014 address_test_mode && (smtp_input || extract_recipients ||
3015 filter_test != FTEST_NONE || bi_option)
3018 smtp_input && (sender_address != NULL || filter_test != FTEST_NONE ||
3022 deliver_selectstring != NULL && queue_interval < 0
3025 msg_action == MSG_LOAD &&
3026 (!expansion_test || expansion_test_message != NULL)
3030 fprintf(stderr, "exim: incompatible command-line options or arguments\n");
3034 /* If debugging is set up, set the file and the file descriptor to pass on to
3035 child processes. It should, of course, be 2 for stderr. Also, force the daemon
3036 to run in the foreground. */
3038 if (debug_selector != 0)
3040 debug_file = stderr;
3041 debug_fd = fileno(debug_file);
3042 background_daemon = FALSE;
3043 if (running_in_test_harness) millisleep(100); /* lets caller finish */
3044 if (debug_selector != D_v) /* -v only doesn't show this */
3046 debug_printf("Exim version %s uid=%ld gid=%ld pid=%d D=%x\n",
3047 version_string, (long int)real_uid, (long int)real_gid, (int)getpid(),
3049 show_whats_supported(stderr);
3053 /* When started with root privilege, ensure that the limits on the number of
3054 open files and the number of processes (where that is accessible) are
3055 sufficiently large, or are unset, in case Exim has been called from an
3056 environment where the limits are screwed down. Not all OS have the ability to
3057 change some of these limits. */
3061 DEBUG(D_any) debug_print_ids(US"Exim has no root privilege:");
3067 #ifdef RLIMIT_NOFILE
3068 if (getrlimit(RLIMIT_NOFILE, &rlp) < 0)
3070 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NOFILE) failed: %s",
3072 rlp.rlim_cur = rlp.rlim_max = 0;
3075 /* I originally chose 1000 as a nice big number that was unlikely to
3076 be exceeded. It turns out that some older OS have a fixed upper limit of
3079 if (rlp.rlim_cur < 1000)
3081 rlp.rlim_cur = rlp.rlim_max = 1000;
3082 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3084 rlp.rlim_cur = rlp.rlim_max = 256;
3085 if (setrlimit(RLIMIT_NOFILE, &rlp) < 0)
3086 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NOFILE) failed: %s",
3093 if (getrlimit(RLIMIT_NPROC, &rlp) < 0)
3095 log_write(0, LOG_MAIN|LOG_PANIC, "getrlimit(RLIMIT_NPROC) failed: %s",
3097 rlp.rlim_cur = rlp.rlim_max = 0;
3100 #ifdef RLIM_INFINITY
3101 if (rlp.rlim_cur != RLIM_INFINITY && rlp.rlim_cur < 1000)
3103 rlp.rlim_cur = rlp.rlim_max = RLIM_INFINITY;
3105 if (rlp.rlim_cur < 1000)
3107 rlp.rlim_cur = rlp.rlim_max = 1000;
3109 if (setrlimit(RLIMIT_NPROC, &rlp) < 0)
3110 log_write(0, LOG_MAIN|LOG_PANIC, "setrlimit(RLIMIT_NPROC) failed: %s",
3116 /* Exim is normally entered as root (but some special configurations are
3117 possible that don't do this). However, it always spins off sub-processes that
3118 set their uid and gid as required for local delivery. We don't want to pass on
3119 any extra groups that root may belong to, so we want to get rid of them all at
3122 We need to obey setgroups() at this stage, before possibly giving up root
3123 privilege for a changed configuration file, but later on we might need to
3124 check on the additional groups for the admin user privilege - can't do that
3125 till after reading the config, which might specify the exim gid. Therefore,
3126 save the group list here first. */
3128 group_count = getgroups(NGROUPS_MAX, group_list);
3130 /* There is a fundamental difference in some BSD systems in the matter of
3131 groups. FreeBSD and BSDI are known to be different; NetBSD and OpenBSD are
3132 known not to be different. On the "different" systems there is a single group
3133 list, and the first entry in it is the current group. On all other versions of
3134 Unix there is a supplementary group list, which is in *addition* to the current
3135 group. Consequently, to get rid of all extraneous groups on a "standard" system
3136 you pass over 0 groups to setgroups(), while on a "different" system you pass
3137 over a single group - the current group, which is always the first group in the
3138 list. Calling setgroups() with zero groups on a "different" system results in
3139 an error return. The following code should cope with both types of system.
3141 However, if this process isn't running as root, setgroups() can't be used
3142 since you have to be root to run it, even if throwing away groups. Not being
3143 root here happens only in some unusual configurations. We just ignore the
3146 if (setgroups(0, NULL) != 0)
3148 if (setgroups(1, group_list) != 0 && !unprivileged)
3150 fprintf(stderr, "exim: setgroups() failed: %s\n", strerror(errno));
3155 /* If the configuration file name has been altered by an argument on the
3156 command line (either a new file name or a macro definition) and the caller is
3157 not root or the exim user, or if this is a filter testing run, remove any
3158 setuid privilege the program has, and run as the underlying user.
3160 If ALT_CONFIG_ROOT_ONLY is defined, the exim user is locked out of this, which
3161 severely restricts the use of -C for some purposes.
3163 Otherwise, set the real ids to the effective values (should be root unless run
3164 from inetd, which it can either be root or the exim uid, if one is configured).
3166 There is a private mechanism for bypassing some of this, in order to make it
3167 possible to test lots of configurations automatically, without having either to
3168 recompile each time, or to patch in an actual configuration file name and other
3169 values (such as the path name). If running in the test harness, pretend that
3170 configuration file changes and macro definitions haven't happened. */
3173 (config_changed || macros != NULL) && /* Config changed, and */
3174 real_uid != root_uid && /* Not root, and */
3175 #ifndef ALT_CONFIG_ROOT_ONLY /* (when not locked out) */
3176 real_uid != exim_uid && /* Not exim, and */
3178 !running_in_test_harness /* Not fudged */
3180 expansion_test /* expansion testing */
3182 filter_test != FTEST_NONE) /* Filter testing */
3184 setgroups(group_count, group_list);
3185 exim_setugid(real_uid, real_gid, FALSE,
3186 US"-C, -D, -be or -bf forces real uid");
3187 removed_privilege = TRUE;
3189 /* In the normal case when Exim is called like this, stderr is available
3190 and should be used for any logging information because attempts to write
3191 to the log will usually fail. To arrange this, we unset really_exim. However,
3192 if no stderr is available there is no point - we might as well have a go
3193 at the log (if it fails, syslog will be written). */
3195 if (log_stderr != NULL) really_exim = FALSE;
3198 /* Privilege is to be retained for the moment. It may be dropped later,
3199 depending on the job that this Exim process has been asked to do. For now, set
3200 the real uid to the effective so that subsequent re-execs of Exim are done by a
3203 else exim_setugid(geteuid(), getegid(), FALSE, US"forcing real = effective");
3205 /* If testing a filter, open the file(s) now, before wasting time doing other
3206 setups and reading the message. */
3208 if ((filter_test & FTEST_SYSTEM) != 0)
3210 filter_sfd = Uopen(filter_test_sfile, O_RDONLY, 0);
3213 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_sfile,
3215 return EXIT_FAILURE;
3219 if ((filter_test & FTEST_USER) != 0)
3221 filter_ufd = Uopen(filter_test_ufile, O_RDONLY, 0);
3224 fprintf(stderr, "exim: failed to open %s: %s\n", filter_test_ufile,
3226 return EXIT_FAILURE;
3230 /* Read the main runtime configuration data; this gives up if there
3231 is a failure. It leaves the configuration file open so that the subsequent
3232 configuration data for delivery can be read if needed. */
3236 /* Handle the decoding of logging options. */
3238 decode_bits(&log_write_selector, &log_extra_selector, 0, 0, log_selector_string,
3239 log_options, log_options_count, US"log");
3243 debug_printf("configuration file is %s\n", config_main_filename);
3244 debug_printf("log selectors = %08x %08x\n", log_write_selector,
3245 log_extra_selector);
3248 /* If domain literals are not allowed, check the sender address that was
3249 supplied with -f. Ditto for a stripped trailing dot. */
3251 if (sender_address != NULL)
3253 if (sender_address[sender_address_domain] == '[' && !allow_domain_literals)
3255 fprintf(stderr, "exim: bad -f address \"%s\": domain literals not "
3256 "allowed\n", sender_address);
3257 return EXIT_FAILURE;
3259 if (f_end_dot && !strip_trailing_dot)
3261 fprintf(stderr, "exim: bad -f address \"%s.\": domain is malformed "
3262 "(trailing dot not allowed)\n", sender_address);
3263 return EXIT_FAILURE;
3267 /* Paranoia check of maximum lengths of certain strings. There is a check
3268 on the length of the log file path in log.c, which will come into effect
3269 if there are any calls to write the log earlier than this. However, if we
3270 get this far but the string is very long, it is better to stop now than to
3271 carry on and (e.g.) receive a message and then have to collapse. The call to
3272 log_write() from here will cause the ultimate panic collapse if the complete
3273 file name exceeds the buffer length. */
3275 if (Ustrlen(log_file_path) > 200)
3276 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3277 "log_file_path is longer than 200 chars: aborting");
3279 if (Ustrlen(pid_file_path) > 200)
3280 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3281 "pid_file_path is longer than 200 chars: aborting");
3283 if (Ustrlen(spool_directory) > 200)
3284 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3285 "spool_directory is longer than 200 chars: aborting");
3287 /* Length check on the process name given to syslog for its TAG field,
3288 which is only permitted to be 32 characters or less. See RFC 3164. */
3290 if (Ustrlen(syslog_processname) > 32)
3291 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3292 "syslog_processname is longer than 32 chars: aborting");
3294 /* In some operating systems, the environment variable TMPDIR controls where
3295 temporary files are created; Exim doesn't use these (apart from when delivering
3296 to MBX mailboxes), but called libraries such as DBM libraries may require them.
3297 If TMPDIR is found in the environment, reset it to the value defined in the
3298 TMPDIR macro, if this macro is defined. */
3303 for (p = USS environ; *p != NULL; p++)
3305 if (Ustrncmp(*p, "TMPDIR=", 7) == 0 &&
3306 Ustrcmp(*p+7, TMPDIR) != 0)
3308 uschar *newp = malloc(Ustrlen(TMPDIR) + 8);
3309 sprintf(CS newp, "TMPDIR=%s", TMPDIR);
3311 DEBUG(D_any) debug_printf("reset TMPDIR=%s in environment\n", TMPDIR);
3317 /* Timezone handling. If timezone_string is "utc", set a flag to cause all
3318 timestamps to be in UTC (gmtime() is used instead of localtime()). Otherwise,
3319 we may need to get rid of a bogus timezone setting. This can arise when Exim is
3320 called by a user who has set the TZ variable. This then affects the timestamps
3321 in log files and in Received: headers, and any created Date: header lines. The
3322 required timezone is settable in the configuration file, so nothing can be done
3323 about this earlier - but hopefully nothing will normally be logged earlier than
3324 this. We have to make a new environment if TZ is wrong, but don't bother if
3325 timestamps_utc is set, because then all times are in UTC anyway. */
3327 if (timezone_string != NULL && strcmpic(timezone_string, US"UTC") == 0)
3329 timestamps_utc = TRUE;
3333 uschar *envtz = US getenv("TZ");
3334 if ((envtz == NULL && timezone_string != NULL) ||
3336 (timezone_string == NULL ||
3337 Ustrcmp(timezone_string, envtz) != 0)))
3339 uschar **p = USS environ;
3343 while (*p++ != NULL) count++;
3344 if (envtz == NULL) count++;
3345 newp = new = malloc(sizeof(uschar *) * (count + 1));
3346 for (p = USS environ; *p != NULL; p++)
3348 if (Ustrncmp(*p, "TZ=", 3) == 0) continue;
3351 if (timezone_string != NULL)
3353 *newp = malloc(Ustrlen(timezone_string) + 4);
3354 sprintf(CS *newp++, "TZ=%s", timezone_string);
3359 DEBUG(D_any) debug_printf("Reset TZ to %s: time is %s\n", timezone_string,
3360 tod_stamp(tod_log));
3364 /* Handle the case when we have removed the setuid privilege because of -C or
3365 -D. This means that the caller of Exim was not root, and, provided that
3366 ALT_CONFIG_ROOT_ONLY is not defined, was not the Exim user that is built into
3369 If ALT_CONFIG_ROOT_ONLY is not defined, there is a problem if it turns out we
3370 were running as the exim user defined in the configuration file (different to
3371 the one in the binary). The sysadmin may expect this case to retain privilege
3372 because "the binary was called by the Exim user", but it hasn't, because of the
3373 order in which it handles this stuff. There are two possibilities:
3375 (1) If deliver_drop_privilege is set, Exim is not going to re-exec in order
3376 to do message deliveries. Thus, the fact that it is running as a
3377 non-privileged user is plausible, and might be wanted in some special
3378 configurations. However, really_exim will have been set false when
3379 privilege was dropped, to stop Exim trying to write to its normal log
3380 files. Therefore, re-enable normal log processing, assuming the sysadmin
3381 has set up the log directory correctly.
3383 (2) If deliver_drop_privilege is not set, the configuration won't work as
3384 apparently intended, and so we log a panic message. In order to retain
3385 root for -C or -D, the caller must either be root or the Exim user
3386 defined in the binary (when deliver_drop_ privilege is false).
3388 If ALT_CONFIG_ROOT_ONLY is defined, we don't know whether we were called by the
3389 built-in exim user or one defined in the configuration. In either event,
3390 re-enable log processing, assuming the sysadmin knows what they are doing. */
3392 if (removed_privilege && (config_changed || macros != NULL) &&
3393 real_uid == exim_uid)
3395 #ifdef ALT_CONFIG_ROOT_ONLY
3396 really_exim = TRUE; /* let logging work normally */
3399 if (deliver_drop_privilege)
3400 really_exim = TRUE; /* let logging work normally */
3402 log_write(0, LOG_MAIN|LOG_PANIC,
3403 "exim user (uid=%d) is defined only at runtime; privilege lost for %s",
3404 (int)exim_uid, config_changed? "-C" : "-D");
3408 /* Start up Perl interpreter if Perl support is configured and there is a
3409 perl_startup option, and the configuration or the command line specifies
3410 initializing starting. Note that the global variables are actually called
3411 opt_perl_xxx to avoid clashing with perl's namespace (perl_*). */
3414 if (perl_start_option != 0)
3415 opt_perl_at_start = (perl_start_option > 0);
3416 if (opt_perl_at_start && opt_perl_startup != NULL)
3419 DEBUG(D_any) debug_printf("Starting Perl interpreter\n");
3420 errstr = init_perl(opt_perl_startup);
3423 fprintf(stderr, "exim: error in perl_startup code: %s\n", errstr);
3424 return EXIT_FAILURE;
3426 opt_perl_started = TRUE;
3428 #endif /* EXIM_PERL */
3430 /* Log the arguments of the call if the configuration file said so. This is
3431 a debugging feature for finding out what arguments certain MUAs actually use.
3432 Don't attempt it if logging is disabled, or if listing variables or if
3433 verifying/testing addresses or expansions. */
3435 if (((debug_selector & D_any) != 0 || (log_extra_selector & LX_arguments) != 0)
3436 && really_exim && !list_options && !checking)
3439 uschar *p = big_buffer;
3441 (void)getcwd(CS p+4, big_buffer_size - 4);
3443 (void)string_format(p, big_buffer_size - (p - big_buffer), " %d args:", argc);
3445 for (i = 0; i < argc; i++)
3447 int len = Ustrlen(argv[i]);
3450 if (p + len + 8 >= big_buffer + big_buffer_size)
3453 log_write(0, LOG_MAIN, "%s", big_buffer);
3454 Ustrcpy(big_buffer, "...");
3457 printing = string_printing(argv[i]);
3458 if (printing[0] == 0) quote = US"\""; else
3460 uschar *pp = printing;
3462 while (*pp != 0) if (isspace(*pp++)) { quote = US"\""; break; }
3464 sprintf(CS p, " %s%.*s%s", quote, (int)(big_buffer_size -
3465 (p - big_buffer) - 4), printing, quote);
3469 if ((log_extra_selector & LX_arguments) != 0)
3470 log_write(0, LOG_MAIN, "%s", big_buffer);
3472 debug_printf("%s\n", big_buffer);
3475 /* Set the working directory to be the top-level spool directory. We don't rely
3476 on this in the code, which always uses fully qualified names, but it's useful
3477 for core dumps etc. Don't complain if it fails - the spool directory might not
3478 be generally accessible and calls with the -C option (and others) have lost
3479 privilege by now. Before the chdir, we try to ensure that the directory exists.
3482 if (Uchdir(spool_directory) != 0)
3484 (void)directory_make(spool_directory, US"", SPOOL_DIRECTORY_MODE, FALSE);
3485 (void)Uchdir(spool_directory);
3488 /* Handle calls with the -bi option. This is a sendmail option to rebuild *the*
3489 alias file. Exim doesn't have such a concept, but this call is screwed into
3490 Sun's YP makefiles. Handle this by calling a configured script, as the real
3491 user who called Exim. The -oA option can be used to pass an argument to the
3496 (void)fclose(config_file);
3497 if (bi_command != NULL)
3501 argv[i++] = bi_command;
3502 if (alias_arg != NULL) argv[i++] = alias_arg;
3505 setgroups(group_count, group_list);
3506 exim_setugid(real_uid, real_gid, FALSE, US"running bi_command");
3508 DEBUG(D_exec) debug_printf("exec %.256s %.256s\n", argv[0],
3509 (argv[1] == NULL)? US"" : argv[1]);
3511 execv(CS argv[0], (char *const *)argv);
3512 fprintf(stderr, "exim: exec failed: %s\n", strerror(errno));
3517 DEBUG(D_any) debug_printf("-bi used but bi_command not set; exiting\n");
3522 /* If an action on specific messages is requested, or if a daemon or queue
3523 runner is being started, we need to know if Exim was called by an admin user.
3524 This is the case if the real user is root or exim, or if the real group is
3525 exim, or if one of the supplementary groups is exim or a group listed in
3526 admin_groups. We don't fail all message actions immediately if not admin_user,
3527 since some actions can be performed by non-admin users. Instead, set admin_user
3528 for later interrogation. */
3530 if (real_uid == root_uid || real_uid == exim_uid || real_gid == exim_gid)
3535 for (i = 0; i < group_count; i++)
3537 if (group_list[i] == exim_gid) admin_user = TRUE;
3538 else if (admin_groups != NULL)
3540 for (j = 1; j <= (int)(admin_groups[0]); j++)
3541 if (admin_groups[j] == group_list[i])
3542 { admin_user = TRUE; break; }
3544 if (admin_user) break;
3548 /* Another group of privileged users are the trusted users. These are root,
3549 exim, and any caller matching trusted_users or trusted_groups. Trusted callers
3550 are permitted to specify sender_addresses with -f on the command line, and
3551 other message parameters as well. */
3553 if (real_uid == root_uid || real_uid == exim_uid)
3554 trusted_caller = TRUE;
3559 if (trusted_users != NULL)
3561 for (i = 1; i <= (int)(trusted_users[0]); i++)
3562 if (trusted_users[i] == real_uid)
3563 { trusted_caller = TRUE; break; }
3566 if (!trusted_caller && trusted_groups != NULL)
3568 for (i = 1; i <= (int)(trusted_groups[0]); i++)
3570 if (trusted_groups[i] == real_gid)
3571 trusted_caller = TRUE;
3572 else for (j = 0; j < group_count; j++)
3574 if (trusted_groups[i] == group_list[j])
3575 { trusted_caller = TRUE; break; }
3577 if (trusted_caller) break;
3582 if (trusted_caller) DEBUG(D_any) debug_printf("trusted user\n");
3583 if (admin_user) DEBUG(D_any) debug_printf("admin user\n");
3585 /* Only an admin user may start the daemon or force a queue run in the default
3586 configuration, but the queue run restriction can be relaxed. Only an admin
3587 user may request that a message be returned to its sender forthwith. Only an
3588 admin user may specify a debug level greater than D_v (because it might show
3589 passwords, etc. in lookup queries). Only an admin user may request a queue
3594 BOOL debugset = (debug_selector & ~D_v) != 0;
3595 if (deliver_give_up || daemon_listen ||
3596 (count_queue && queue_list_requires_admin) ||
3597 (list_queue && queue_list_requires_admin) ||
3598 (queue_interval >= 0 && prod_requires_admin) ||
3599 (debugset && !running_in_test_harness))
3601 fprintf(stderr, "exim:%s permission denied\n", debugset? " debugging" : "");
3606 /* If the real user is not root or the exim uid, the argument for passing
3607 in an open TCP/IP connection for another message is not permitted, nor is
3608 running with the -N option for any delivery action, unless this call to exim is
3609 one that supplied an input message, or we are using a patched exim for
3610 regression testing. */
3612 if (real_uid != root_uid && real_uid != exim_uid &&
3613 (continue_hostname != NULL ||
3615 (queue_interval >= 0 || daemon_listen || msg_action_arg > 0)
3616 )) && !running_in_test_harness)
3618 fprintf(stderr, "exim: Permission denied\n");
3619 return EXIT_FAILURE;
3622 /* If the caller is not trusted, certain arguments are ignored when running for
3623 real, but are permitted when checking things (-be, -bv, -bt, -bh, -bf, -bF).
3624 Note that authority for performing certain actions on messages is tested in the
3625 queue_action() function. */
3627 if (!trusted_caller && !checking && filter_test == FTEST_NONE)
3629 sender_host_name = sender_host_address = interface_address =
3630 sender_ident = received_protocol = NULL;
3631 sender_host_port = interface_port = 0;
3632 sender_host_authenticated = authenticated_sender = authenticated_id = NULL;
3635 /* If a sender host address is set, extract the optional port number off the
3636 end of it and check its syntax. Do the same thing for the interface address.
3637 Exim exits if the syntax is bad. */
3641 if (sender_host_address != NULL)
3642 sender_host_port = check_port(sender_host_address);
3643 if (interface_address != NULL)
3644 interface_port = check_port(interface_address);
3647 /* If an SMTP message is being received check to see if the standard input is a
3648 TCP/IP socket. If it is, we assume that Exim was called from inetd if the
3649 caller is root or the Exim user, or if the port is a privileged one. Otherwise,
3654 union sockaddr_46 inetd_sock;
3655 EXIM_SOCKLEN_T size = sizeof(inetd_sock);
3656 if (getpeername(0, (struct sockaddr *)(&inetd_sock), &size) == 0)
3658 int family = ((struct sockaddr *)(&inetd_sock))->sa_family;
3659 if (family == AF_INET || family == AF_INET6)
3661 union sockaddr_46 interface_sock;
3662 size = sizeof(interface_sock);
3664 if (getsockname(0, (struct sockaddr *)(&interface_sock), &size) == 0)
3665 interface_address = host_ntoa(-1, &interface_sock, NULL,
3668 if (host_is_tls_on_connect_port(interface_port)) tls_on_connect = TRUE;
3670 if (real_uid == root_uid || real_uid == exim_uid || interface_port < 1024)
3673 sender_host_address = host_ntoa(-1, (struct sockaddr *)(&inetd_sock),
3674 NULL, &sender_host_port);
3675 if (mua_wrapper) log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Input from "
3676 "inetd is not supported when mua_wrapper is set");
3681 "exim: Permission denied (unprivileged user, unprivileged port)\n");
3682 return EXIT_FAILURE;
3688 /* If the load average is going to be needed while receiving a message, get it
3689 now for those OS that require the first call to os_getloadavg() to be done as
3690 root. There will be further calls later for each message received. */
3692 #ifdef LOAD_AVG_NEEDS_ROOT
3693 if (receiving_message &&
3694 (queue_only_load >= 0 ||
3695 (is_inetd && smtp_load_reserve >= 0)
3698 load_average = OS_GETLOADAVG();
3702 /* The queue_only configuration option can be overridden by -odx on the command
3703 line, except that if queue_only_override is false, queue_only cannot be unset
3704 from the command line. */
3706 if (queue_only_set && (queue_only_override || arg_queue_only))
3707 queue_only = arg_queue_only;
3709 /* The receive_timeout and smtp_receive_timeout options can be overridden by
3712 if (arg_receive_timeout >= 0) receive_timeout = arg_receive_timeout;
3713 if (arg_smtp_receive_timeout >= 0)
3714 smtp_receive_timeout = arg_smtp_receive_timeout;
3716 /* If Exim was started with root privilege, unless we have already removed the
3717 root privilege above as a result of -C, -D, -be, -bf or -bF, remove it now
3718 except when starting the daemon or doing some kind of delivery or address
3719 testing (-bt). These are the only cases when root need to be retained. We run
3720 as exim for -bv and -bh. However, if deliver_drop_privilege is set, root is
3721 retained only for starting the daemon. We always do the initgroups() in this
3722 situation (controlled by the TRUE below), in order to be as close as possible
3723 to the state Exim usually runs in. */
3725 if (!unprivileged && /* originally had root AND */
3726 !removed_privilege && /* still got root AND */
3727 !daemon_listen && /* not starting the daemon */
3728 queue_interval <= 0 && /* (either kind of daemon) */
3730 deliver_drop_privilege || /* requested unprivileged */
3732 queue_interval < 0 && /* not running the queue */
3733 (msg_action_arg < 0 || /* and */
3734 msg_action != MSG_DELIVER) && /* not delivering and */
3735 (!checking || !address_test_mode) /* not address checking */
3739 exim_setugid(exim_uid, exim_gid, TRUE, US"privilege not needed");
3742 /* When we are retaining a privileged uid, we still change to the exim gid. */
3744 else setgid(exim_gid);
3746 /* Handle a request to list the delivery queue */
3750 set_process_info("listing the queue");
3751 queue_list(list_queue_option, argv + recipients_arg, argc - recipients_arg);
3755 /* Handle a request to count the delivery queue */
3759 set_process_info("counting the queue");
3764 /* Handle actions on specific messages, except for the force delivery and
3765 message load actions, which are done below. Some actions take a whole list of
3766 message ids, which are known to continue up to the end of the arguments. Others
3767 take a single message id and then operate on the recipients list. */
3769 if (msg_action_arg > 0 && msg_action != MSG_DELIVER && msg_action != MSG_LOAD)
3771 int yield = EXIT_SUCCESS;
3772 set_process_info("acting on specified messages");
3774 if (!one_msg_action)
3776 for (i = msg_action_arg; i < argc; i++)
3777 if (!queue_action(argv[i], msg_action, NULL, 0, 0))
3778 yield = EXIT_FAILURE;
3781 else if (!queue_action(argv[msg_action_arg], msg_action, argv, argc,
3782 recipients_arg)) yield = EXIT_FAILURE;
3786 /* All the modes below here require the remaining configuration sections
3787 to be read, except that we can skip over the ACL setting when delivering
3788 specific messages, or doing a queue run. (For various testing cases we could
3789 skip too, but as they are rare, it doesn't really matter.) The argument is TRUE
3792 readconf_rest(msg_action_arg > 0 || (queue_interval == 0 && !daemon_listen));
3794 /* The configuration data will have been read into POOL_PERM because we won't
3795 ever want to reset back past it. Change the current pool to POOL_MAIN. In fact,
3796 this is just a bit of pedantic tidiness. It wouldn't really matter if the
3797 configuration were read into POOL_MAIN, because we don't do any resets till
3798 later on. However, it seems right, and it does ensure that both pools get used.
3801 store_pool = POOL_MAIN;
3803 /* Handle the -brt option. This is for checking out retry configurations.
3804 The next three arguments are a domain name or a complete address, and
3805 optionally two error numbers. All it does is to call the function that
3806 scans the retry configuration data. */
3808 if (test_retry_arg >= 0)
3810 retry_config *yield;
3811 int basic_errno = 0;
3815 if (test_retry_arg >= argc)
3817 printf("-brt needs a domain or address argument\n");
3818 exim_exit(EXIT_FAILURE);
3820 s1 = argv[test_retry_arg++];
3823 /* If the first argument contains no @ and no . it might be a local user
3824 or it might be a single-component name. Treat as a domain. */
3826 if (Ustrchr(s1, '@') == NULL && Ustrchr(s1, '.') == NULL)
3828 printf("Warning: \"%s\" contains no '@' and no '.' characters. It is "
3829 "being \ntreated as a one-component domain, not as a local part.\n\n",
3833 /* There may be an optional second domain arg. */
3835 if (test_retry_arg < argc && Ustrchr(argv[test_retry_arg], '.') != NULL)
3836 s2 = argv[test_retry_arg++];
3838 /* The final arg is an error name */
3840 if (test_retry_arg < argc)
3842 uschar *ss = argv[test_retry_arg];
3844 readconf_retry_error(ss, ss + Ustrlen(ss), &basic_errno, &more_errno);
3847 printf("%s\n", CS error);
3848 return EXIT_FAILURE;
3851 /* For the {MAIL,RCPT,DATA}_4xx errors, a value of 255 means "any", and a
3852 code > 100 as an error is for matching codes to the decade. Turn them into
3853 a real error code, off the decade. */
3855 if (basic_errno == ERRNO_MAIL4XX ||
3856 basic_errno == ERRNO_RCPT4XX ||
3857 basic_errno == ERRNO_DATA4XX)
3859 int code = (more_errno >> 8) & 255;
3861 more_errno = (more_errno & 0xffff00ff) | (21 << 8);
3862 else if (code > 100)
3863 more_errno = (more_errno & 0xffff00ff) | ((code - 96) << 8);
3867 yield = retry_find_config(s1, s2, basic_errno, more_errno);
3868 if (yield == NULL) printf("No retry information found\n"); else
3871 more_errno = yield->more_errno;
3872 printf("Retry rule: %s ", yield->pattern);
3874 if (yield->basic_errno == ERRNO_EXIMQUOTA)
3876 printf("quota%s%s ",
3877 (more_errno > 0)? "_" : "",
3878 (more_errno > 0)? readconf_printtime(more_errno) : US"");
3880 else if (yield->basic_errno == ECONNREFUSED)
3882 printf("refused%s%s ",
3883 (more_errno > 0)? "_" : "",
3884 (more_errno == 'M')? "MX" :
3885 (more_errno == 'A')? "A" : "");
3887 else if (yield->basic_errno == ETIMEDOUT)
3890 if ((more_errno & RTEF_CTOUT) != 0) printf("_connect");
3892 if (more_errno != 0) printf("_%s",
3893 (more_errno == 'M')? "MX" : "A");
3896 else if (yield->basic_errno == ERRNO_AUTHFAIL)
3897 printf("auth_failed ");
3900 for (r = yield->rules; r != NULL; r = r->next)
3902 printf("%c,%s", r->rule, readconf_printtime(r->timeout)); /* Do not */
3903 printf(",%s", readconf_printtime(r->p1)); /* amalgamate */
3909 printf(",%d.", x/1000);
3923 exim_exit(EXIT_SUCCESS);
3926 /* Handle a request to list one or more configuration options */
3930 set_process_info("listing variables");
3931 if (recipients_arg >= argc) readconf_print(US"all", NULL);
3932 else for (i = recipients_arg; i < argc; i++)
3935 (Ustrcmp(argv[i], "router") == 0 ||
3936 Ustrcmp(argv[i], "transport") == 0 ||
3937 Ustrcmp(argv[i], "authenticator") == 0))
3939 readconf_print(argv[i+1], argv[i]);
3942 else readconf_print(argv[i], NULL);
3944 exim_exit(EXIT_SUCCESS);
3948 /* Handle a request to deliver one or more messages that are already on the
3949 queue. Values of msg_action other than MSG_DELIVER and MSG_LOAD are dealt with
3950 above. MSG_LOAD is handled with -be (which is the only time it applies) below.
3952 Delivery of specific messages is typically used for a small number when
3953 prodding by hand (when the option forced_delivery will be set) or when
3954 re-execing to regain root privilege. Each message delivery must happen in a
3955 separate process, so we fork a process for each one, and run them sequentially
3956 so that debugging output doesn't get intertwined, and to avoid spawning too
3957 many processes if a long list is given. However, don't fork for the last one;
3958 this saves a process in the common case when Exim is called to deliver just one
3961 if (msg_action_arg > 0 && msg_action != MSG_LOAD)
3963 if (prod_requires_admin && !admin_user)
3965 fprintf(stderr, "exim: Permission denied\n");
3966 exim_exit(EXIT_FAILURE);
3968 set_process_info("delivering specified messages");
3969 if (deliver_give_up) forced_delivery = deliver_force_thaw = TRUE;
3970 for (i = msg_action_arg; i < argc; i++)
3975 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3976 else if ((pid = fork()) == 0)
3978 (void)deliver_message(argv[i], forced_delivery, deliver_give_up);
3979 _exit(EXIT_SUCCESS);
3983 fprintf(stderr, "failed to fork delivery process for %s: %s\n", argv[i],
3985 exim_exit(EXIT_FAILURE);
3989 exim_exit(EXIT_SUCCESS);
3993 /* If only a single queue run is requested, without SMTP listening, we can just
3994 turn into a queue runner, with an optional starting message id. */
3996 if (queue_interval == 0 && !daemon_listen)
3998 DEBUG(D_queue_run) debug_printf("Single queue run%s%s%s%s\n",
3999 (start_queue_run_id == NULL)? US"" : US" starting at ",
4000 (start_queue_run_id == NULL)? US"" : start_queue_run_id,
4001 (stop_queue_run_id == NULL)? US"" : US" stopping at ",
4002 (stop_queue_run_id == NULL)? US"" : stop_queue_run_id);
4003 set_process_info("running the queue (single queue run)");
4004 queue_run(start_queue_run_id, stop_queue_run_id, FALSE);
4005 exim_exit(EXIT_SUCCESS);
4009 /* Find the login name of the real user running this process. This is always
4010 needed when receiving a message, because it is written into the spool file. It
4011 may also be used to construct a from: or a sender: header, and in this case we
4012 need the user's full name as well, so save a copy of it, checked for RFC822
4013 syntax and munged if necessary, if it hasn't previously been set by the -F
4014 argument. We may try to get the passwd entry more than once, in case NIS or
4015 other delays are in evidence. Save the home directory for use in filter testing
4020 if ((pw = getpwuid(real_uid)) != NULL)
4022 originator_login = string_copy(US pw->pw_name);
4023 originator_home = string_copy(US pw->pw_dir);
4025 /* If user name has not been set by -F, set it from the passwd entry
4026 unless -f has been used to set the sender address by a trusted user. */
4028 if (originator_name == NULL)
4030 if (sender_address == NULL ||
4031 (!trusted_caller && filter_test == FTEST_NONE))
4033 uschar *name = US pw->pw_gecos;
4034 uschar *amp = Ustrchr(name, '&');
4037 /* Most Unix specify that a '&' character in the gecos field is
4038 replaced by a copy of the login name, and some even specify that
4039 the first character should be upper cased, so that's what we do. */
4044 string_format(buffer, sizeof(buffer), "%.*s%n%s%s",
4045 amp - name, name, &loffset, originator_login, amp + 1);
4046 buffer[loffset] = toupper(buffer[loffset]);
4050 /* If a pattern for matching the gecos field was supplied, apply
4051 it and then expand the name string. */
4053 if (gecos_pattern != NULL && gecos_name != NULL)
4056 re = regex_must_compile(gecos_pattern, FALSE, TRUE); /* Use malloc */
4058 if (regex_match_and_setup(re, name, 0, -1))
4060 uschar *new_name = expand_string(gecos_name);
4062 if (new_name != NULL)
4064 DEBUG(D_receive) debug_printf("user name \"%s\" extracted from "
4065 "gecos field \"%s\"\n", new_name, name);
4068 else DEBUG(D_receive) debug_printf("failed to expand gecos_name string "
4069 "\"%s\": %s\n", gecos_name, expand_string_message);
4071 else DEBUG(D_receive) debug_printf("gecos_pattern \"%s\" did not match "
4072 "gecos field \"%s\"\n", gecos_pattern, name);
4073 store_free((void *)re);
4075 originator_name = string_copy(name);
4078 /* A trusted caller has used -f but not -F */
4080 else originator_name = US"";
4083 /* Break the retry loop */
4088 if (++i > finduser_retries) break;
4092 /* If we cannot get a user login, log the incident and give up, unless the
4093 configuration specifies something to use. When running in the test harness,
4094 any setting of unknown_login overrides the actual name. */
4096 if (originator_login == NULL || running_in_test_harness)
4098 if (unknown_login != NULL)
4100 originator_login = expand_string(unknown_login);
4101 if (originator_name == NULL && unknown_username != NULL)
4102 originator_name = expand_string(unknown_username);
4103 if (originator_name == NULL) originator_name = US"";
4105 if (originator_login == NULL)
4106 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to get user name for uid %d",
4110 /* Ensure that the user name is in a suitable form for use as a "phrase" in an
4113 originator_name = string_copy(parse_fix_phrase(originator_name,
4114 Ustrlen(originator_name), big_buffer, big_buffer_size));
4116 /* If a message is created by this call of Exim, the uid/gid of its originator
4117 are those of the caller. These values are overridden if an existing message is
4118 read in from the spool. */
4120 originator_uid = real_uid;
4121 originator_gid = real_gid;
4123 DEBUG(D_receive) debug_printf("originator: uid=%d gid=%d login=%s name=%s\n",
4124 (int)originator_uid, (int)originator_gid, originator_login, originator_name);
4126 /* Run in daemon and/or queue-running mode. The function daemon_go() never
4127 returns. We leave this till here so that the originator_ fields are available
4128 for incoming messages via the daemon. The daemon cannot be run in mua_wrapper
4131 if (daemon_listen || queue_interval > 0)
4135 fprintf(stderr, "Daemon cannot be run when mua_wrapper is set\n");
4136 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Daemon cannot be run when "
4137 "mua_wrapper is set");
4142 /* If the sender ident has not been set (by a trusted caller) set it to
4143 the caller. This will get overwritten below for an inetd call. If a trusted
4144 caller has set it empty, unset it. */
4146 if (sender_ident == NULL) sender_ident = originator_login;
4147 else if (sender_ident[0] == 0) sender_ident = NULL;
4149 /* Handle the -brw option, which is for checking out rewriting rules. Cause log
4150 writes (on errors) to go to stderr instead. Can't do this earlier, as want the
4151 originator_* variables set. */
4153 if (test_rewrite_arg >= 0)
4155 really_exim = FALSE;
4156 if (test_rewrite_arg >= argc)
4158 printf("-brw needs an address argument\n");
4159 exim_exit(EXIT_FAILURE);
4161 rewrite_test(argv[test_rewrite_arg]);
4162 exim_exit(EXIT_SUCCESS);
4165 /* A locally-supplied message is considered to be coming from a local user
4166 unless a trusted caller supplies a sender address with -f, or is passing in the
4167 message via SMTP (inetd invocation or otherwise). */
4169 if ((sender_address == NULL && !smtp_input) ||
4170 (!trusted_caller && filter_test == FTEST_NONE))
4172 sender_local = TRUE;
4174 /* A trusted caller can supply authenticated_sender and authenticated_id
4175 via -oMas and -oMai and if so, they will already be set. Otherwise, force
4176 defaults except when host checking. */
4178 if (authenticated_sender == NULL && !host_checking)
4179 authenticated_sender = string_sprintf("%s@%s", originator_login,
4180 qualify_domain_sender);
4181 if (authenticated_id == NULL && !host_checking)
4182 authenticated_id = originator_login;
4185 /* Trusted callers are always permitted to specify the sender address.
4186 Untrusted callers may specify it if it matches untrusted_set_sender, or if what
4187 is specified is the empty address. However, if a trusted caller does not
4188 specify a sender address for SMTP input, we leave sender_address unset. This
4189 causes the MAIL commands to be honoured. */
4191 if ((!smtp_input && sender_address == NULL) ||
4192 !receive_check_set_sender(sender_address))
4194 /* Either the caller is not permitted to set a general sender, or this is
4195 non-SMTP input and the trusted caller has not set a sender. If there is no
4196 sender, or if a sender other than <> is set, override with the originator's
4197 login (which will get qualified below), except when checking things. */
4199 if (sender_address == NULL /* No sender_address set */
4201 (sender_address[0] != 0 && /* Non-empty sender address, AND */
4202 !checking && /* Not running tests, AND */
4203 filter_test == FTEST_NONE)) /* Not testing a filter */
4205 sender_address = originator_login;
4206 sender_address_forced = FALSE;
4207 sender_address_domain = 0;
4211 /* Remember whether an untrusted caller set the sender address */
4213 sender_set_untrusted = sender_address != originator_login && !trusted_caller;
4215 /* Ensure that the sender address is fully qualified unless it is the empty
4216 address, which indicates an error message, or doesn't exist (root caller, smtp
4217 interface, no -f argument). */
4219 if (sender_address != NULL && sender_address[0] != 0 &&
4220 sender_address_domain == 0)
4221 sender_address = string_sprintf("%s@%s", local_part_quote(sender_address),
4222 qualify_domain_sender);
4224 DEBUG(D_receive) debug_printf("sender address = %s\n", sender_address);
4226 /* Handle a request to verify a list of addresses, or test them for delivery.
4227 This must follow the setting of the sender address, since routers can be
4228 predicated upon the sender. If no arguments are given, read addresses from
4229 stdin. Set debug_level to at least D_v to get full output for address testing.
4232 if (verify_address_mode || address_test_mode)
4235 int flags = vopt_qualify;
4237 if (verify_address_mode)
4239 if (!verify_as_sender) flags |= vopt_is_recipient;
4240 DEBUG(D_verify) debug_print_ids(US"Verifying:");
4245 flags |= vopt_is_recipient;
4246 debug_selector |= D_v;
4247 debug_file = stderr;
4248 debug_fd = fileno(debug_file);
4249 DEBUG(D_verify) debug_print_ids(US"Address testing:");
4252 if (recipients_arg < argc)
4254 while (recipients_arg < argc)
4256 uschar *s = argv[recipients_arg++];
4259 BOOL finished = FALSE;
4260 uschar *ss = parse_find_address_end(s, FALSE);
4261 if (*ss == ',') *ss = 0; else finished = TRUE;
4262 test_address(s, flags, &exit_value);
4265 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4272 uschar *s = get_stdinput(NULL, NULL);
4273 if (s == NULL) break;
4274 test_address(s, flags, &exit_value);
4278 exim_exit(exit_value);
4281 /* Handle expansion checking. Either expand items on the command line, or read
4282 from stdin if there aren't any. If -Mset was specified, load the message so
4283 that its variables can be used, but restrict this facility to admin users.
4284 Otherwise, if -bem was used, read a message from stdin. */
4288 if (msg_action_arg > 0 && msg_action == MSG_LOAD)
4290 uschar spoolname[256]; /* Not big_buffer; used in spool_read_header() */
4293 fprintf(stderr, "exim: permission denied\n");
4296 message_id = argv[msg_action_arg];
4297 (void)string_format(spoolname, sizeof(spoolname), "%s-H", message_id);
4298 if (!spool_open_datafile(message_id))
4299 printf ("Failed to load message datafile %s\n", message_id);
4300 if (spool_read_header(spoolname, TRUE, FALSE) != spool_read_OK)
4301 printf ("Failed to load message %s\n", message_id);
4304 /* Read a test message from a file. We fudge it up to be on stdin, saving
4305 stdin itself for later reading of expansion strings. */
4307 else if (expansion_test_message != NULL)
4309 int save_stdin = dup(0);
4310 int fd = Uopen(expansion_test_message, O_RDONLY, 0);
4313 fprintf(stderr, "exim: failed to open %s: %s\n", expansion_test_message,
4315 return EXIT_FAILURE;
4318 filter_test = FTEST_USER; /* Fudge to make it look like filter test */
4319 message_ended = END_NOTENDED;
4320 read_message_body(receive_msg(extract_recipients));
4321 message_linecount += body_linecount;
4322 (void)dup2(save_stdin, 0);
4323 (void)close(save_stdin);
4324 clearerr(stdin); /* Required by Darwin */
4327 /* Allow $recipients for this testing */
4329 enable_dollar_recipients = TRUE;
4331 /* Expand command line items */
4333 if (recipients_arg < argc)
4335 while (recipients_arg < argc)
4337 uschar *s = argv[recipients_arg++];
4338 uschar *ss = expand_string(s);
4339 if (ss == NULL) printf ("Failed: %s\n", expand_string_message);
4340 else printf("%s\n", CS ss);
4348 char *(*fn_readline)(char *) = NULL;
4349 char *(*fn_addhist)(char *) = NULL;
4352 void *dlhandle = set_readline(&fn_readline, &fn_addhist);
4358 uschar *source = get_stdinput(fn_readline, fn_addhist);
4359 if (source == NULL) break;
4360 ss = expand_string(source);
4362 printf ("Failed: %s\n", expand_string_message);
4363 else printf("%s\n", CS ss);
4367 if (dlhandle != NULL) dlclose(dlhandle);
4371 /* The data file will be open after -Mset */
4373 if (deliver_datafile >= 0)
4375 (void)close(deliver_datafile);
4376 deliver_datafile = -1;
4379 exim_exit(EXIT_SUCCESS);
4383 /* The active host name is normally the primary host name, but it can be varied
4384 for hosts that want to play several parts at once. We need to ensure that it is
4385 set for host checking, and for receiving messages. */
4387 smtp_active_hostname = primary_hostname;
4388 if (raw_active_hostname != NULL)
4390 uschar *nah = expand_string(raw_active_hostname);
4393 if (!expand_string_forcedfail)
4394 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand \"%s\" "
4395 "(smtp_active_hostname): %s", raw_active_hostname,
4396 expand_string_message);
4398 else if (nah[0] != 0) smtp_active_hostname = nah;
4401 /* Handle host checking: this facility mocks up an incoming SMTP call from a
4402 given IP address so that the blocking and relay configuration can be tested.
4403 Unless a sender_ident was set by -oMt, we discard it (the default is the
4404 caller's login name). An RFC 1413 call is made only if we are running in the
4405 test harness and an incoming interface and both ports are specified, because
4406 there is no TCP/IP call to find the ident for. */
4413 if (!sender_ident_set)
4415 sender_ident = NULL;
4416 if (running_in_test_harness && sender_host_port != 0 &&
4417 interface_address != NULL && interface_port != 0)
4418 verify_get_ident(1413);
4421 /* In case the given address is a non-canonical IPv6 address, canonicize
4422 it. The code works for both IPv4 and IPv6, as it happens. */
4424 size = host_aton(sender_host_address, x);
4425 sender_host_address = store_get(48); /* large enough for full IPv6 */
4426 (void)host_nmtoa(size, x, -1, sender_host_address, ':');
4428 /* Now set up for testing */
4430 host_build_sender_fullhost();
4434 sender_local = FALSE;
4435 sender_host_notsocket = TRUE;
4436 debug_file = stderr;
4437 debug_fd = fileno(debug_file);
4438 fprintf(stdout, "\n**** SMTP testing session as if from host %s\n"
4439 "**** but without any ident (RFC 1413) callback.\n"
4440 "**** This is not for real!\n\n",
4441 sender_host_address);
4443 if (verify_check_host(&hosts_connection_nolog) == OK)
4444 log_write_selector &= ~L_smtp_connection;
4445 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4447 /* NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4448 because a log line has already been written for all its failure exists
4449 (usually "connection refused: <reason>") and writing another one is
4450 unnecessary clutter. */
4452 if (smtp_start_session())
4454 reset_point = store_get(0);
4457 store_reset(reset_point);
4458 if (smtp_setup_msg() <= 0) break;
4459 if (!receive_msg(FALSE)) break;
4463 exim_exit(EXIT_SUCCESS);
4467 /* Arrange for message reception if recipients or SMTP were specified;
4468 otherwise complain unless a version print (-bV) happened or this is a filter
4469 verification test. In the former case, show the configuration file name. */
4471 if (recipients_arg >= argc && !extract_recipients && !smtp_input)
4473 if (version_printed)
4475 printf("Configuration file is %s\n", config_main_filename);
4476 return EXIT_SUCCESS;
4479 if (filter_test == FTEST_NONE)
4480 exim_usage(called_as);
4484 /* If mua_wrapper is set, Exim is being used to turn an MUA that submits on the
4485 standard input into an MUA that submits to a smarthost over TCP/IP. We know
4486 that we are not called from inetd, because that is rejected above. The
4487 following configuration settings are forced here:
4489 (1) Synchronous delivery (-odi)
4490 (2) Errors to stderr (-oep == -oeq)
4491 (3) No parallel remote delivery
4492 (4) Unprivileged delivery
4494 We don't force overall queueing options because there are several of them;
4495 instead, queueing is avoided below when mua_wrapper is set. However, we do need
4496 to override any SMTP queueing. */
4500 synchronous_delivery = TRUE;
4501 arg_error_handling = ERRORS_STDERR;
4502 remote_max_parallel = 1;
4503 deliver_drop_privilege = TRUE;
4505 queue_smtp_domains = NULL;
4509 /* Prepare to accept one or more new messages on the standard input. When a
4510 message has been read, its id is returned in message_id[]. If doing immediate
4511 delivery, we fork a delivery process for each received message, except for the
4512 last one, where we can save a process switch.
4514 It is only in non-smtp mode that error_handling is allowed to be changed from
4515 its default of ERRORS_SENDER by argument. (Idle thought: are any of the
4516 sendmail error modes other than -oem ever actually used? Later: yes.) */
4518 if (!smtp_input) error_handling = arg_error_handling;
4520 /* If this is an inetd call, ensure that stderr is closed to prevent panic
4521 logging being sent down the socket and make an identd call to get the
4526 (void)fclose(stderr);
4527 exim_nullstd(); /* Re-open to /dev/null */
4528 verify_get_ident(IDENT_PORT);
4529 host_build_sender_fullhost();
4530 set_process_info("handling incoming connection from %s via inetd",
4534 /* If the sender host address has been set, build sender_fullhost if it hasn't
4535 already been done (which it will have been for inetd). This caters for the
4536 case when it is forced by -oMa. However, we must flag that it isn't a socket,
4537 so that the test for IP options is skipped for -bs input. */
4539 if (sender_host_address != NULL && sender_fullhost == NULL)
4541 host_build_sender_fullhost();
4542 set_process_info("handling incoming connection from %s via -oMa",
4544 sender_host_notsocket = TRUE;
4547 /* Otherwise, set the sender host as unknown except for inetd calls. This
4548 prevents host checking in the case of -bs not from inetd and also for -bS. */
4550 else if (!is_inetd) sender_host_unknown = TRUE;
4552 /* If stdout does not exist, then dup stdin to stdout. This can happen
4553 if exim is started from inetd. In this case fd 0 will be set to the socket,
4554 but fd 1 will not be set. This also happens for passed SMTP channels. */
4556 if (fstat(1, &statbuf) < 0) (void)dup2(0, 1);
4558 /* Set up the incoming protocol name and the state of the program. Root is
4559 allowed to force received protocol via the -oMr option above. If we have come
4560 via inetd, the process info has already been set up. We don't set
4561 received_protocol here for smtp input, as it varies according to
4562 batch/HELO/EHLO/AUTH/TLS. */
4566 if (!is_inetd) set_process_info("accepting a local %sSMTP message from <%s>",
4567 smtp_batched_input? "batched " : "",
4568 (sender_address!= NULL)? sender_address : originator_login);
4572 if (received_protocol == NULL)
4573 received_protocol = string_sprintf("local%s", called_as);
4574 set_process_info("accepting a local non-SMTP message from <%s>",
4578 /* Initialize the session_local_queue-only flag (this will be ignored if
4579 mua_wrapper is set) */
4582 session_local_queue_only = queue_only;
4584 /* For non-SMTP and for batched SMTP input, check that there is enough space on
4585 the spool if so configured. On failure, we must not attempt to send an error
4586 message! (For interactive SMTP, the check happens at MAIL FROM and an SMTP
4587 error code is given.) */
4589 if ((!smtp_input || smtp_batched_input) && !receive_check_fs(0))
4591 fprintf(stderr, "exim: insufficient disk space\n");
4592 return EXIT_FAILURE;
4595 /* If this is smtp input of any kind, real or batched, handle the start of the
4598 NOTE: We do *not* call smtp_log_no_mail() if smtp_start_session() fails,
4599 because a log line has already been written for all its failure exists
4600 (usually "connection refused: <reason>") and writing another one is
4601 unnecessary clutter. */
4607 if (verify_check_host(&hosts_connection_nolog) == OK)
4608 log_write_selector &= ~L_smtp_connection;
4609 log_write(L_smtp_connection, LOG_MAIN, "%s", smtp_get_connection_info());
4610 if (!smtp_start_session())
4613 exim_exit(EXIT_SUCCESS);
4617 /* Otherwise, set up the input size limit here. */
4621 thismessage_size_limit = expand_string_integer(message_size_limit, TRUE);
4622 if (expand_string_message != NULL)
4624 if (thismessage_size_limit == -1)
4625 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "failed to expand "
4626 "message_size_limit: %s", expand_string_message);
4628 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "invalid value for "
4629 "message_size_limit: %s", expand_string_message);
4633 /* Loop for several messages when reading SMTP input. If we fork any child
4634 processes, we don't want to wait for them unless synchronous delivery is
4635 requested, so set SIGCHLD to SIG_IGN in that case. This is not necessarily the
4636 same as SIG_DFL, despite the fact that documentation often lists the default as
4637 "ignore". This is a confusing area. This is what I know:
4639 At least on some systems (e.g. Solaris), just setting SIG_IGN causes child
4640 processes that complete simply to go away without ever becoming defunct. You
4641 can't then wait for them - but we don't want to wait for them in the
4642 non-synchronous delivery case. However, this behaviour of SIG_IGN doesn't
4643 happen for all OS (e.g. *BSD is different).
4645 But that's not the end of the story. Some (many? all?) systems have the
4646 SA_NOCLDWAIT option for sigaction(). This requests the behaviour that Solaris
4647 has by default, so it seems that the difference is merely one of default
4648 (compare restarting vs non-restarting signals).
4650 To cover all cases, Exim sets SIG_IGN with SA_NOCLDWAIT here if it can. If not,
4651 it just sets SIG_IGN. To be on the safe side it also calls waitpid() at the end
4652 of the loop below. Paranoia rules.
4654 February 2003: That's *still* not the end of the story. There are now versions
4655 of Linux (where SIG_IGN does work) that are picky. If, having set SIG_IGN, a
4656 process then calls waitpid(), a grumble is written to the system log, because
4657 this is logically inconsistent. In other words, it doesn't like the paranoia.
4658 As a consequenc of this, the waitpid() below is now excluded if we are sure
4659 that SIG_IGN works. */
4661 if (!synchronous_delivery)
4664 struct sigaction act;
4665 act.sa_handler = SIG_IGN;
4666 sigemptyset(&(act.sa_mask));
4667 act.sa_flags = SA_NOCLDWAIT;
4668 sigaction(SIGCHLD, &act, NULL);
4670 signal(SIGCHLD, SIG_IGN);
4674 /* Save the current store pool point, for resetting at the start of
4675 each message, and save the real sender address, if any. */
4677 reset_point = store_get(0);
4678 real_sender_address = sender_address;
4680 /* Loop to receive messages; receive_msg() returns TRUE if there are more
4681 messages to be read (SMTP input), or FALSE otherwise (not SMTP, or SMTP channel
4686 store_reset(reset_point);
4689 /* Handle the SMTP case; call smtp_setup_mst() to deal with the initial SMTP
4690 input and build the recipients list, before calling receive_msg() to read the
4691 message proper. Whatever sender address is given in the SMTP transaction is
4692 often ignored for local senders - we use the actual sender, which is normally
4693 either the underlying user running this process or a -f argument provided by
4694 a trusted caller. It is saved in real_sender_address. The test for whether to
4695 accept the SMTP sender is encapsulated in receive_check_set_sender(). */
4700 if ((rc = smtp_setup_msg()) > 0)
4702 if (real_sender_address != NULL &&
4703 !receive_check_set_sender(sender_address))
4705 sender_address = raw_sender = real_sender_address;
4706 sender_address_unrewritten = NULL;
4709 /* For batched SMTP, we have to run the acl_not_smtp_start ACL, since it
4710 isn't really SMTP, so no other ACL will run until the acl_not_smtp one at
4711 the very end. The result of the ACL is ignored (as for other non-SMTP
4712 messages). It is run for its potential side effects. */
4714 if (smtp_batched_input && acl_not_smtp_start != NULL)
4716 uschar *user_msg, *log_msg;
4717 enable_dollar_recipients = TRUE;
4718 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4719 &user_msg, &log_msg);
4720 enable_dollar_recipients = FALSE;
4723 /* Now get the data for the message */
4725 more = receive_msg(extract_recipients);
4726 if (message_id[0] == 0)
4729 smtp_log_no_mail(); /* Log no mail if configured */
4730 exim_exit(EXIT_FAILURE);
4735 smtp_log_no_mail(); /* Log no mail if configured */
4736 exim_exit((rc == 0)? EXIT_SUCCESS : EXIT_FAILURE);
4740 /* In the non-SMTP case, we have all the information from the command
4741 line, but must process it in case it is in the more general RFC822
4742 format, and in any case, to detect syntax errors. Also, it appears that
4743 the use of comma-separated lists as single arguments is common, so we
4744 had better support them. */
4750 int count = argc - recipients_arg;
4751 uschar **list = argv + recipients_arg;
4753 /* These options cannot be changed dynamically for non-SMTP messages */
4755 active_local_sender_retain = local_sender_retain;
4756 active_local_from_check = local_from_check;
4758 /* Save before any rewriting */
4760 raw_sender = string_copy(sender_address);
4762 /* Loop for each argument */
4764 for (i = 0; i < count; i++)
4766 int start, end, domain;
4768 uschar *s = list[i];
4770 /* Loop for each comma-separated address */
4774 BOOL finished = FALSE;
4776 uschar *ss = parse_find_address_end(s, FALSE);
4778 if (*ss == ',') *ss = 0; else finished = TRUE;
4780 /* Check max recipients - if -t was used, these aren't recipients */
4782 if (recipients_max > 0 && ++rcount > recipients_max &&
4783 !extract_recipients)
4785 if (error_handling == ERRORS_STDERR)
4787 fprintf(stderr, "exim: too many recipients\n");
4788 exim_exit(EXIT_FAILURE);
4793 moan_to_sender(ERRMESS_TOOMANYRECIP, NULL, NULL, stdin, TRUE)?
4794 errors_sender_rc : EXIT_FAILURE;
4799 parse_extract_address(s, &errmess, &start, &end, &domain, FALSE);
4801 if (domain == 0 && !allow_unqualified_recipient)
4804 errmess = US"unqualified recipient address not allowed";
4807 if (recipient == NULL)
4809 if (error_handling == ERRORS_STDERR)
4811 fprintf(stderr, "exim: bad recipient address \"%s\": %s\n",
4812 string_printing(list[i]), errmess);
4813 exim_exit(EXIT_FAILURE);
4819 eblock.text1 = string_printing(list[i]);
4820 eblock.text2 = errmess;
4822 moan_to_sender(ERRMESS_BADARGADDRESS, &eblock, NULL, stdin, TRUE)?
4823 errors_sender_rc : EXIT_FAILURE;
4827 receive_add_recipient(recipient, -1);
4830 while (*(++s) != 0 && (*s == ',' || isspace(*s)));
4834 /* Show the recipients when debugging */
4839 if (sender_address != NULL) debug_printf("Sender: %s\n", sender_address);
4840 if (recipients_list != NULL)
4842 debug_printf("Recipients:\n");
4843 for (i = 0; i < recipients_count; i++)
4844 debug_printf(" %s\n", recipients_list[i].address);
4848 /* Run the acl_not_smtp_start ACL if required. The result of the ACL is
4849 ignored; rejecting here would just add complication, and it can just as
4850 well be done later. Allow $recipients to be visible in the ACL. */
4852 if (acl_not_smtp_start != NULL)
4854 uschar *user_msg, *log_msg;
4855 enable_dollar_recipients = TRUE;
4856 (void)acl_check(ACL_WHERE_NOTSMTP_START, NULL, acl_not_smtp_start,
4857 &user_msg, &log_msg);
4858 enable_dollar_recipients = FALSE;
4861 /* Read the data for the message. If filter_test is not FTEST_NONE, this
4862 will just read the headers for the message, and not write anything onto the
4865 message_ended = END_NOTENDED;
4866 more = receive_msg(extract_recipients);
4868 /* more is always FALSE here (not SMTP message) when reading a message
4869 for real; when reading the headers of a message for filter testing,
4870 it is TRUE if the headers were terminated by '.' and FALSE otherwise. */
4872 if (message_id[0] == 0) exim_exit(EXIT_FAILURE);
4873 } /* Non-SMTP message reception */
4875 /* If this is a filter testing run, there are headers in store, but
4876 no message on the spool. Run the filtering code in testing mode, setting
4877 the domain to the qualify domain and the local part to the current user,
4878 unless they have been set by options. The prefix and suffix are left unset
4879 unless specified. The the return path is set to to the sender unless it has
4880 already been set from a return-path header in the message. */
4882 if (filter_test != FTEST_NONE)
4884 deliver_domain = (ftest_domain != NULL)?
4885 ftest_domain : qualify_domain_recipient;
4886 deliver_domain_orig = deliver_domain;
4887 deliver_localpart = (ftest_localpart != NULL)?
4888 ftest_localpart : originator_login;
4889 deliver_localpart_orig = deliver_localpart;
4890 deliver_localpart_prefix = ftest_prefix;
4891 deliver_localpart_suffix = ftest_suffix;
4892 deliver_home = originator_home;
4894 if (return_path == NULL)
4896 printf("Return-path copied from sender\n");
4897 return_path = string_copy(sender_address);
4901 printf("Return-path = %s\n", (return_path[0] == 0)? US"<>" : return_path);
4903 printf("Sender = %s\n", (sender_address[0] == 0)? US"<>" : sender_address);
4905 receive_add_recipient(
4906 string_sprintf("%s%s%s@%s",
4907 (ftest_prefix == NULL)? US"" : ftest_prefix,
4909 (ftest_suffix == NULL)? US"" : ftest_suffix,
4910 deliver_domain), -1);
4912 printf("Recipient = %s\n", recipients_list[0].address);
4913 if (ftest_prefix != NULL) printf("Prefix = %s\n", ftest_prefix);
4914 if (ftest_suffix != NULL) printf("Suffix = %s\n", ftest_suffix);
4916 (void)chdir("/"); /* Get away from wherever the user is running this from */
4918 /* Now we run either a system filter test, or a user filter test, or both.
4919 In the latter case, headers added by the system filter will persist and be
4920 available to the user filter. We need to copy the filter variables
4923 if ((filter_test & FTEST_SYSTEM) != 0)
4925 if (!filter_runtest(filter_sfd, filter_test_sfile, TRUE, more))
4926 exim_exit(EXIT_FAILURE);
4929 memcpy(filter_sn, filter_n, sizeof(filter_sn));
4931 if ((filter_test & FTEST_USER) != 0)
4933 if (!filter_runtest(filter_ufd, filter_test_ufile, FALSE, more))
4934 exim_exit(EXIT_FAILURE);
4937 exim_exit(EXIT_SUCCESS);
4940 /* Else act on the result of message reception. We should not get here unless
4941 message_id[0] is non-zero. If queue_only is set, session_local_queue_only
4942 will be TRUE. If it is not, check on the number of messages received in this
4945 if (!session_local_queue_only &&
4946 smtp_accept_queue_per_connection > 0 &&
4947 receive_messagecount > smtp_accept_queue_per_connection)
4949 session_local_queue_only = TRUE;
4950 queue_only_reason = 2;
4953 /* Initialize local_queue_only from session_local_queue_only. If it is false,
4954 and queue_only_load is set, check that the load average is below it. If it is
4955 not, set local_queue_only TRUE. If queue_only_load_latch is true (the
4956 default), we put the whole session into queue_only mode. It then remains this
4957 way for any subsequent messages on the same SMTP connection. This is a
4958 deliberate choice; even though the load average may fall, it doesn't seem
4959 right to deliver later messages on the same call when not delivering earlier
4960 ones. However, there are odd cases where this is not wanted, so this can be
4961 changed by setting queue_only_load_latch false. */
4963 local_queue_only = session_local_queue_only;
4964 if (!local_queue_only && queue_only_load >= 0)
4966 local_queue_only = (load_average = OS_GETLOADAVG()) > queue_only_load;
4967 if (local_queue_only)
4969 queue_only_reason = 3;
4970 if (queue_only_load_latch) session_local_queue_only = TRUE;
4974 /* If running as an MUA wrapper, all queueing options and freezing options
4978 local_queue_only = queue_only_policy = deliver_freeze = FALSE;
4980 /* Log the queueing here, when it will get a message id attached, but
4981 not if queue_only is set (case 0). Case 1 doesn't happen here (too many
4984 if (local_queue_only) switch(queue_only_reason)
4987 log_write(L_delay_delivery,
4988 LOG_MAIN, "no immediate delivery: more than %d messages "
4989 "received in one connection", smtp_accept_queue_per_connection);
4993 log_write(L_delay_delivery,
4994 LOG_MAIN, "no immediate delivery: load average %.2f",
4995 (double)load_average/1000.0);
4999 /* Else do the delivery unless the ACL or local_scan() called for queue only
5000 or froze the message. Always deliver in a separate process. A fork failure is
5001 not a disaster, as the delivery will eventually happen on a subsequent queue
5002 run. The search cache must be tidied before the fork, as the parent will
5003 do it before exiting. The child will trigger a lookup failure and
5004 thereby defer the delivery if it tries to use (for example) a cached ldap
5005 connection that the parent has called unbind on. */
5007 else if (!queue_only_policy && !deliver_freeze)
5012 if ((pid = fork()) == 0)
5015 close_unwanted(); /* Close unwanted file descriptors and TLS */
5016 exim_nullstd(); /* Ensure std{in,out,err} exist */
5018 /* Re-exec Exim if we need to regain privilege (note: in mua_wrapper
5019 mode, deliver_drop_privilege is forced TRUE). */
5021 if (geteuid() != root_uid && !deliver_drop_privilege && !unprivileged)
5023 (void)child_exec_exim(CEE_EXEC_EXIT, FALSE, NULL, FALSE, 2, US"-Mc",
5025 /* Control does not return here. */
5028 /* No need to re-exec */
5030 rc = deliver_message(message_id, FALSE, FALSE);
5032 _exit((!mua_wrapper || rc == DELIVER_MUA_SUCCEEDED)?
5033 EXIT_SUCCESS : EXIT_FAILURE);
5038 log_write(0, LOG_MAIN|LOG_PANIC, "failed to fork automatic delivery "
5039 "process: %s", strerror(errno));
5042 /* In the parent, wait if synchronous delivery is required. This will
5043 always be the case in MUA wrapper mode. */
5045 else if (synchronous_delivery)
5048 while (wait(&status) != pid);
5049 if ((status & 0x00ff) != 0)
5050 log_write(0, LOG_MAIN|LOG_PANIC,
5051 "process %d crashed with signal %d while delivering %s",
5052 (int)pid, status & 0x00ff, message_id);
5053 if (mua_wrapper && (status & 0xffff) != 0) exim_exit(EXIT_FAILURE);
5057 /* The loop will repeat if more is TRUE. If we do not know know that the OS
5058 automatically reaps children (see comments above the loop), clear away any
5059 finished subprocesses here, in case there are lots of messages coming in
5060 from the same source. */
5062 #ifndef SIG_IGN_WORKS
5063 while (waitpid(-1, NULL, WNOHANG) > 0);
5067 exim_exit(EXIT_SUCCESS); /* Never returns */
5068 return 0; /* To stop compiler warning */